GAS WATER HEATING DEVICE AND CONTROL METHOD THEREOF

Description

RELATED APPLICATION

The present disclosure claims priority from Chinese invention patent application No.202211436043.5, entitled “GAS WATER HEATING DEVICE AND CONTROL METHOD THEREOF”.

Field

The present disclosure relates to the field of water heating devices, and particularly to a gas water heating device and a control method thereof.

Background

The conventional gas water heating device generally adopts staged combustion. When a user starts to use water, the gas water heating device is always ignited through the same group of burners, and then determines whether to ignite other groups of burners according to the required load. There are relatively few instances in a household where a very high load of hot water supply is required at a particular moment, and this occurs only occasionally and for a relatively short duration. In most cases of hot water usage, the gas water heater heats water with a small load or a medium load compared with full-load heating. Therefore, the group of burners for ignition in the combustion device is substantially in a combustion state all the time, and some groups of burners close to the group of burners for ignition are often in a combustion state, while the remaining groups of burners are generally not supplied with gas and are in an off state. The above situation leads to the operation of partial groups of burners in the same positions each time the gas water heater heats water with a small load or a medium load, which will cause the area of a heat exchanger corresponding to the partial groups of burners to be in a high-intensity heating state for a long time, which is prone to scaling, thereby causing a failure.

SUMMARY

In order to overcome the above defects of the prior art, the technical problem to be solved by the embodiments of the present disclosure is to provide a gas water heating device and a control method thereof, which can solve the problem that a local area of a heat exchanger is prone to failure due to long-term heating, thereby prolonging the service life of the heat exchanger.

In order to achieve the above objective, the technical solutions adopted by the present disclosure are specifically as follows:

• • A control method of a gas water heating device, wherein the gas water heating device comprises a combustion device, which comprises a first group of burners and a second group of burners that can be independently started and stopped;
  • the control method of the gas water heating device comprising:
  • when a first preset condition is met, controlling the first group of burners to start combustion, and controlling the second group of burners to be in an off state; and
  • when the first preset condition is met subsequently, controlling the second group of burners to start combustion and controlling the first group of burners to be in an off state, or controlling the second group of burners to start combustion and controlling the first group of burners to be in an off state after the first group of burners are started for a first preset number of times.

A gas water heating device, comprising:

• • a heat exchanger;
  • a combustion device provided opposite to the heat exchanger and capable of supplying heat energy to the heat exchanger, wherein the combustion device comprises at least a first group of burners and a second group of burners separated by a preset distance;
  • wherein the gas water heating device comprises at least a first working state and a second working state;
  • wherein in the first working state, the first group of burners are in a combustion state and the second group of burners are in an off state; and
  • wherein in the second working state, the second group of burners are in a combustion state, and the first group of burners are in an off state.

Compared with the prior art, the present disclosure has the following advantageous effects:

• • Each time the user starts to use water, the control method of the gas water heating device in the present disclosure may alternately ignite the first group of burners and the second group of burners to start combustion, and supply heat energy to the heat exchanger using the group of burners that have been just ignited to start combustion, thereby solving the problem that when the gas water heating device is just turned on to start combustion for heating and the required heat load of the gas water heating device is small, the same group of burners are always used to heat the heat exchanger, such that a local area of the heat exchanger corresponding to the group of burners is prone to failure due to high-intensity heating for a long time. Thus, the service life of the gas water heating device can be prolonged.

With reference to the following description and drawings, specific embodiments of the present disclosure are disclosed in detail, and the ways in which the principles of the present disclosure may be adopted are pointed out. It should be understood that the scope of the embodiments of the present disclosure is not limited thereby. Features described and/or illustrated for one embodiment may be used in one or more other embodiments in the same or similar manner, combined with features in other embodiments, or substituted for features in other embodiments.

With reference to the following descriptions and drawings, the specific embodiments of the present disclosure will be disclosed in detail to indicate the ways in which the principle of the present disclosure can be adopted. It should be understood that the scope of the embodiments of the present disclosure are not limited thereto. The embodiments of the present disclosure include many changes, modifications and equivalents within the spirit and clauses of the accompanied claims. The features described and/or illustrated with respect to one embodiment may be used in one or more other embodiments in the same or similar way, may be combined with the features in other embodiments, or may take place of those features.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings described here are only for the purpose of explanation and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes and scales of the components in the drawings are only schematic, which are used to help the understanding of the present disclosure, rather than specifically limiting the shapes and scales of the components in the present disclosure. Under the teaching of the present disclosure, persons skilled in the art can select various possible shapes and scales to implement the present disclosure according to specific situations.

FIG. 1 illustrates a flowchart of steps of a control method of a gas water heating device according to an embodiment of the present disclosure;

FIG. 2 illustrates a structural diagram of a gas water heating device according to a first embodiment of the present disclosure;

FIG. 3 illustrates a structural diagram of a gas water heating device according to a second embodiment of the present disclosure;

FIG. 4 illustrates a structural diagram of a gas water heating device according to a third embodiment of the present disclosure;

FIG. 5 illustrates a structural diagram of a gas water heating device according to a fourth embodiment of the present disclosure; and

FIG. 6 illustrates a structural diagram of a distributor according to an embodiment of the

REFERENCE NUMERALS

• • 1: heat exchanger; 11: first area; 12: second area; 13: third area; 14: fourth area; 15: fifth area; 2: combustion device; 21: first group of burners; 22: second group of burners; 23: third group of burners; 24: fourth group of burners; 25: fifth group of burners; 26: fire row burner; 3: first ignition device; 4: second ignition device; 5: distributor; 51: gas transmission channel; 52: on-off valve.

DETAILED DESCRIPTION

The details of the present disclosure can be more clearly understood with reference to the drawings and the description of the specific embodiments of the present disclosure. However, the specific embodiments of the present disclosure described here are only for the purpose of explaining the present disclosure and should not be construed as limiting the present disclosure in any way. Under the teaching of the present disclosure, a person skilled in the art can conceive any possible variation based on the present disclosure, which should be regarded as falling within the scope of the present disclosure. It should be noted that when an element is referred to as being “provided” on another element, it may be directly on another element or there may be an intermediate element. When an element is regarded as being “connected” to another element, it may be directly connected to another element or there may be an intermediate element at the same time. The terms “mount” and “connect” should be understood in a broad sense. For example, a connection may be a mechanical connection or an electrical connection, or an internal communication between two elements, or a direct connection, or an indirect connection through an intermediate medium. For persons of ordinary skills in the art, the specific meanings of the above terms can be understood according to the specific conditions. The terms “vertical”, “horizontal”, “upper”, “lower”, “left”, “right” and similar expressions used herein are for an illustration purpose only rather than indicating a unique embodiment.

Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art of the present disclosure. The terms used in the Specification of the present disclosure are only for the purpose of describing the specific embodiments, rather than limiting the present disclosure. The term “and/or” used herein includes any and all combinations of one or more of the related items listed.

In order to solve the problem that a local area of a heat exchanger is prone to failure due to long-term heating, the present disclosure proposes a control method of a gas water heating device. FIG. 2 illustrates a structural diagram of a gas water heating device according to a first embodiment of the present disclosure. As illustrated in FIG. 2, the gas water heating device includes a combustion device 2, which includes a first group of burners 21 and a second group of burners 22. As feasible, the first group of burners 21 and the second group of burners 22 can be started and stopped independently. The gas water heating device may further include a heat exchanger 1, and the combustion device 2 is provided opposite to the heat exchanger 1 and can supply heat energy to the heat exchanger 1. The combustion device 2 may be in a combustion state in which it heats the heat exchanger 1, and an off state. The heat exchanger 1 heats the water flowing therethrough under the heat energy supplied by the combustion device 2, so as to obtain hot water meeting the temperature requirement of the user. As feasible, the heat exchanger 1 may be located above the combustion device 2, and the high-temperature flue gas generated from the combustion in the combustion device 2 flows through the heat exchanger 1. The whole combustion device 2 extends substantially along a horizontal direction, and the heat exchanger 1 may also extend substantially along the same horizontal direction corresponding to the combustion device 2.

FIG. 1 illustrates a flowchart of steps of a control method of a gas water heating device according to an embodiment of the present disclosure. As illustrated in FIG. 1, the control method of the gas water heating device may include:

S100: when a first preset condition is met, controlling a first group of burners to start combustion, and controlling a second group of burners to be in an off state.

In this step, when the first preset condition is met, the first group of burners 21 may be controlled to start combustion firstly, that is, the first group of burners 21 may be ignited to start combustion firstly, and meanwhile, the second group of burners 22 may be controlled to be in an off state. In the above process, the first preset condition may include a received water usage signal of the user, and at this time, the gas water heating device is turned on to heat the water for use by the user. When the water usage signal of the user is received, the gas water heating device needs to be ignited. The first group of burners 21 may be controlled to be ignited to start combustion, and the second group of burners 22 may be controlled to be in an off state, so as to complete the ignition of the gas water heating device. At this time, a heating load of the gas water heating device is small relative to a maximum heating load thereof. After that, if the required load is greater than the load supplied by the first group of burners 21 starting combustion, the second group of burners 22 may be controlled to also start combustion.

As feasible, the gas water heating device may include at least two gas transmission channels 51 that can be independently opened and closed. The at least two gas transmission channels 51 are provided corresponding to the first group of burners 21 and the second group of burners 22, respectively. That is, at least one gas transmission channel 51 is provided in communication with the first group of burners 21 and at least one gas transmission channel 51 is provided in communication with the second group of burners 22. In order to form the gas transmission channels 51, the gas water heating device may include a distributor 5 that delivers gas to the combustion device 2, and on which the at least two gas transmission channels 51 that can be independently opened and closed are formed. Specifically, FIG. 6 illustrates a structural diagram of a distributor according to an embodiment of the present disclosure. As illustrated in FIG. 6, the distributor 5 is provided with a main gas transmission channel, with which the at least two gas transmission channels 51 are communicated through corresponding through-holes on the distributor 5, respectively. The distributor 5 is mounted with on-off valves 52, which can control the opening and closing of the through-holes. When the through-hole is closed, the gas transmission channel 51 is disconnected from the main gas transmission channel, that is, the gas transmission channel 51 is closed, and when the through-hole is opened, the gas transmission channel 51 is communicated with the main gas transmission channel, that is, the gas transmission channel 51 is opened.

The controlling the first group of burners 21 to start combustion specifically includes: opening the gas transmission channel 51 corresponding to the first group of burners 21, and starting the first group of burners 21 for combustion. The controlling the second group of burners 22 to be in an off state specifically includes: closing the gas transmission channel 51 corresponding to the second group of burners 22. When the required load (a heat load to be supplied by the gas water heating device to heat the water entering the gas water heating device to a temperature set by the user) is greater than the load supplied by the first group of burners 21 starting combustion, the gas transmission channel 51 corresponding to the second group of burners 22 is opened, thereby controlling the second group of burners 22 to start combustion. When a signal indicating that the user stops using water is received, the gas transmission channels 51 corresponding to the first group of burners 21 and the second group of burners 22 are closed, both the first group of burners 21 and the second group of burners 22 stop working, and the gas water heating device stops heating.

As feasible, the gas water heating device may include: a first ignition device 3 provided close to the first group of burners 21, and a second ignition device 4 provided close to the second group of burners 22. When the gas transmission channel 51 corresponding to the first group of burners 21 is opened to start the first group of burners 21 for combustion, the first group of burners 21 may be ignited by the first ignition device 3 to start combustion. When the required load is greater than the load supplied by the first group of burners 21 starting combustion, the gas transmission channel 51 corresponding to the second group of burners 22 is opened, thereby controlling the second group of burners 22 to start combustion. At this time, the second group of burners 22 may be ignited by the second ignition device 4 to start combustion. The second group of burners 22 may also be ignited by the first group of burners 21 to start combustion.

S200: when the first preset condition is met subsequently, controlling the second group of burners to start combustion and controlling the first group of burners to be in an off state; or after the first group of burners are started for a first preset number of times, controlling the second group of burners to start combustion and controlling the first group of burners to be in an off state.

In this step, in one embodiment, when the first preset condition is met subsequently, that is, after the last water usage, when the gas water heating device receives the water usage signal of the user again and needs to be turned on to heat the water for the user's usage, the second group of burners 22 may be controlled to start combustion firstly, that is, the second group of burners 22 may be ignited to start combustion firstly, and meanwhile, the first group of burners 21 are controlled to be in an off state. Alternatively, in another embodiment, when the user starts to use water and the number of times that the first group of burners 21 start combustion firstly meets the first preset number, if the first preset condition is met subsequently, that is, when the gas water heating device receives the water usage signal of the user again, the second group of burners 22 are controlled to start combustion firstly, and the first group of burners 21 are controlled to be in an off state. Similarly, when the water usage signal of the user is just received, it is necessary to ignite the gas water heating device. Firstly, the second group of burners 22 may be controlled to start combustion, and the first group of burners 21 may be controlled to be in an off state, so as to complete the ignition of the gas water heating device. At this time, the heating load of the gas water heating device is small relative to the maximum heating load thereof. After that, if the required load is greater than the load supplied by the second group of burners 22 starting combustion, the first group of burners 21 may be controlled to start combustion.

When the gas transmission channel 51 corresponding to the second group of burners 22 is opened to start the second group of burners 22 for combustion, the second group of burners 22 may be ignited by the second ignition device 4 to start combustion. When the required load is greater than the load supplied by the second group of burners 22 to start combustion, the gas transmission channel 51 corresponding to the first group of burners 21 is opened to control the first group of burners 21 to start combustion. At this time, the first group of burners 21 may be ignited by the first ignition device 3 to start combustion. The first group of burners 21 may also be ignited by the second group of burners 22 to start combustion. When a signal indicating that the user stops using water is received, the gas transmission channels 51 corresponding to the first group of burners 21 and the second group of burners 22 are closed, both the first group of burners 21 and the second group of burners 22 stop working, and the gas water heating device stops heating.

As feasible, the control method of the gas water heating device may further include the following step:

• • repeating steps S100 and S200. In this step, after step S200 is performed, when the number of times that the second group of burners 22 start combustion meets a second preset number, if the user starts to use water, the first group of burners 21 are controlled to start combustion firstly, and at this time, the second group of burners 22 may be controlled to be in an off state.

In the above step in which when the number of times that the second group of burners 22 start combustion meets the second preset number, the second preset number may be one or more times, which is not limited in present disclosure.

As illustrated in FIG. 2, the combustion device 2 may include at least two fire row burners 26, wherein the first group of burners 21 include at least one fire row burner 26, and the second group of burners 22 include at least one fire row burner 26. When the gas transmission channel 51 corresponding to the first group of burners 21 is opened, the gas enters the fire row burner 26 of the first group of burners 21, and is ignited by the first ignition device 3 for combustion. Similarly, when the gas transmission channel 51 corresponding to the second group of burners 22 is opened, the gas enters the fire row burner 26 of the second group of burners 22, and is ignited by the second ignition device 4 for combustion.

As illustrated in FIG. 2, the heat exchanger 1 may include a plurality of areas, such as a first area 11 and a second area 12. The first group of burners 21 are mainly used to heat the first area 11 of the heat exchanger 1, and the second group of burners 22 are mainly used to heat the second area 12 of the heat exchanger 1. When there is no guiding mechanism to guide flue gas between the heat exchanger 1 and the combustion device 2, the first area 11 of the heat exchanger 1 is substantially located directly above the first group of burners 21, and the second area 12 of the heat exchanger 1 is substantially located directly above the second group of burners 22.

Each time the user starts to use water, the control method of the gas water heating device in the present disclosure may alternately ignite the first group of burners 21 and the second group of burners 22 to start combustion, and supply heat energy to the heat exchanger 1 using the group of burners that have just been ignited to start combustion, thereby solving the problem that when the gas water heating device is just turned on to start combustion for heating and the required heat load of the gas water heating device is small, the same group of burners are always used to heat the heat exchanger 1, such that a local area of the heat exchanger 1 corresponding to the group of burners is prone to failure due to high-intensity heating for a long time, thereby prolonging the service life of the gas water heating device.

In particular, when the flowrate of the water used by the user is low and the required heat load of the gas water heating device is small, the water in the heat exchanger 1 flows slowly, and a local area of the heat exchanger 1 corresponding to the same group of burners always used is under high-intensity heating for a long time, such that the local area of the heat exchanger 1 is prone to scaling. Moreover, since the water flows slowly, the generated scale is more attached to an inner wall of a heat exchange tube of the heat exchanger 1, and the generated scale is more likely to cause the heat exchange tube of the heat exchanger 1 to be unable to rapidly transfer the received heat to the water, such that the heat exchange tube of the heat exchanger 1 is more easily burnt out and failed.

As feasible, the gas water heating device may at least include a first working state and a second working state. In the first working state, the first group of burners 21 are in a combustion state, and the second group of burners 22 are in an off state. In the second working state, the second group of burners 22 are in a combustion state, and the first group of burners 21 are in an off state. In the above way, the first working state and the second working state may be alternately adopted to supply heat energy to the heat exchanger 1 each time the gas water heating device needs to be turned on for heating.

Further, the first group of burners 21 and the second group of burners 22 may be separated by a preset distance. The preset distance may be a distance at which the high-temperature flue gas generated by the first group of burners 21 in a combustion state can produce less effect on the second area 12 of the heat exchanger 1, so as to avoid the second area 12 from being heated in a high intensity. Similarly, the preset distance may also be a distance at which the high-temperature flue gas generated by the second group of burners 22 in combustion state can produce less effect on the first area 11 of the heat exchanger 1, so as to avoid the first area 11 from being heated in a high intensity. In this way, it is possible to effectively avoid the problem that the first area 11 and the second area 12 of the heat exchanger 1 are prone to failure due to high-intensity heating for a long time, thereby prolonging the service life of the gas water heating device. As feasible, the preset distance may also be a distance at which the high-temperature flue gas generated by the second group of burners 22 in a combustion state can produce less effect on a side of the first area 11 close to the second area 12 of the heat exchanger 1, so as to avoid the side of the first area 11 close to the second area 12 from being heated in a high intensity. The preset distance may also be a distance at which the high-temperature flue gas generated by the first group of burners 21 in a combustion state can produce less effect on a side of the second area 12 close to the first area 11 of the heat exchanger 1, so as to avoid the side of the second area 12 close to the first area 11 from being heated in a high intensity. In this way, it is possible to effectively avoid the problem that the side of the first area 11 close to the second area 12 of the heat exchanger 1 and the side of the second area 12 close to the first area 11 of the heat exchanger 1 are prone to failure due to high-intensity heating for a long time, thereby prolonging the service life of the gas water heating device.

If the first group of burners 21 and the second group of burners 22 are not spaced by the preset distance, the high-temperature flue gas generated by the first group of burners 21 in a combustion state will produce great effect on the second area 12 of the heat exchanger 1, so that the second area 12 is heated in a high intensity; and the high-temperature flue gas generated by the second group of burners 22 in a combustion state will also produce great effect on the first area 11 of the heat exchanger 1, so that the first area 11 is heated in a high intensity. As a result, no matter whether the first group of burners 21 or the second group of burners 22 are in a combustion state, the first area 11 and the second area 12 of the heat exchanger 1 will be greatly affected by the high-temperature flue gas, and the service life of the heat exchanger 1 will be reduced. In particular, no matter whether the first group of burners 21 or the second group of burners 22 are in a combustion state, the side of the first area 11 close to the second area 12 of the heat exchanger 1 and the side of the second area 12 close to the first area 11 of the heat exchanger 1 are always greatly affected by the high-temperature flue gas, and scaling is most likely to occur there, so the above sides are also most prone to failure and damage in the later stage.

Since the first group of burners 21 and the second group of burners 22 are spaced by the preset distance, there is also a spacing distance between the first area 11 and the second area 12 of the heat exchanger 1. Thus, when the first group of burners 21 start combustion or keep combustion, the leftmost side of the second area 12 of the heat exchanger 1 corresponding to the second group of burners 22 is heated to a much-reduced degree. Similarly, when the second group of burners 22 start combustion or keep combustion, the rightmost side of the first area 11 of the heat exchanger 1 corresponding to the first group of burners 21 is heated to a much-reduced degree. As a result, no matter when the first group of burners 21 start combustion or keep combustion or when the second group of burners 22 start combustion or keep combustion, the leftmost side of the second area 12 of the heat exchanger 1 corresponding to the second group of burners 22 or the rightmost side of the first area 11 of the heat exchanger 1 corresponding to the first group of burners 21 will not be in a high-intensity heating state for a long time. Therefore, the leftmost side of the second area 12 of the heat exchanger 1 corresponding to the second group of burners 22 and the rightmost side of the first area 11 of the heat exchanger 1 corresponding to the first group of burners 21 are not prone to failure, thereby prolonging the service life of the gas water heating device to a certain extent.

If there is no preset distance between the first group of burners 21 and the second group of burners 22, the first area 11 and the second area 12 of the heat exchanger 1 will also be in close proximity, even when the required heat load is small and only the first group of burners 21 or the second group of burners 22 are started to heat the heat exchanger 1. If only the first group of burners 21 are started to heat the heat exchanger 1, the leftmost side of the second area 12 of the heat exchanger 1 corresponding to the second group of burners 22 will also be in a high-intensity heating state, or if only the second group of burners 22 are started to heat the heat exchanger 1, the rightmost side of the first area 11 of the heat exchanger 1 corresponding to the first group of burners 21 will also be in a high-intensity heating state. That is, when the required heat load is small, the leftmost side of the second area 12 of the heat exchanger 1 corresponding to the second group of burners 22 and the rightmost side of the first area 11 of the heat exchanger 1 corresponding to the first group of burners 21 will always be in a high-intensity heating state, so that the two positions are prone to be burnt out and fail.

As feasible, in order that there exists a preset distance between the first group of burners 21 and the second group of burners 22, as illustrated in FIG. 2, the combustion device 2 may include a third group of burners 23 between the first group of burners 21 and the second group of burners. The first group of burners 21, the second group of burners 22 and the third group of burners 23 are sequentially provided along a horizontal direction. The third group of burners 23 may be ignited by the first group of burners 21 or the second group of burners 22 in a combustion state.

As illustrated in FIG. 2, correspondingly, the distributor 5 may include at least three gas transmission channels 51 that can be independently opened and closed, and the at least three gas transmission channels 51 are provided corresponding to the first group of burners 21, the second group of burners 22 and the third group of burners 23, respectively. Correspondingly, the combustion device 2 may include at least three fire row burners 26, wherein the first group of burners 21 include at least one fire row burner 26, the second group of burners 22 include at least one fire row burner 26, and the third group of burners 23 include at least one fire row burner 26. As illustrated in FIG. 2, the first group of burners 21 are provided opposite to a part of the heat exchanger 1, the second group of burners 22 are provided opposite to a part of the heat exchanger 1, and the third group of burners 23 are provided opposite to a part of the heat exchanger 1. That is, the heat exchanger 1 may include a plurality of areas, such as a first area 11, a second area 12, and a third area 13. The first group of burners 21 are mainly used to heat the first area 11 of the heat exchanger 1, the second group of burners 22 are mainly used to heat the second area 12 of the heat exchanger 1, and the third group of burners 23 are mainly used to heat the third area 13 of the heat exchanger 1. When there is no guiding mechanism to guide flue gas between the heat exchanger 1 and the combustion device 2, the third area 13 of the heat exchanger 1 is substantially located directly above the third group of burners 21, and is located between the first area 11 and the second area 12, so that there is a spacing distance between the first area 11 and the second area 12 of the heat exchanger 1 due to the third area 13. When the third group of burners 23 need to enter a combustion state, the gas transmission channel 51 corresponding to the third group of burners 23 is opened, and the flame of the first group of burners 21 or the second group of burners 22 having been in a combustion state can ignite the gas of the third group of burners 23, so as to enable the third group of burners 23 to enter a combustion state. In order to help the flame of the first group of burners 21 or the second group of burners 22 having been in a combustion state immediately ignite the gas of the third group of burners 23, further, one side of the third group of burners 23 is in close proximity to the first group of burners 21, and the other side of the third group of burners 23 is in close proximity to the second group of burners 22.

In this embodiment, when the gas water heating device is in the first working state, the third group of burners 23 are in an off state. When the gas water heating device is in the second working state, the third group of burners 23 are in an off state.

In this embodiment, the gas water heating device may further include a third working state and a fourth working state. In the third working state, the first group of burners 21 and the third group of burners 23 are in a combustion state, and the second group of burners 22 are in an off state. At this time, the gas transmission channels 51 corresponding to the first group of burners 21 and the third group of burners 23 are in an open state, and the gas transmission channel 51 corresponding to the second group of burners 22 is in a closed state. In the fourth working state, the second group of burners 22 and the third group of burners 23 are in a combustion state, and the first group of burners 21 are in an off state. At this time, the gas transmission channels 51 corresponding to the second group of burners 22 and the third group of burners 23 are in an open state, and the gas transmission channel 51 corresponding to the first group of burners 21 is in a closed state.

Further, the gas water heating device may further include a fifth working state. In the fifth working state, the first group of burners 21, the second group of burners 22 and the third group of burners 23 are in a combustion state. At this time, the gas transmission channels 51 corresponding to the first group of burners 21, the second group of burners 22 and the third group of burners 23 are all in an open state.

Step 100 may further include: controlling the first group of burners 21 to start combustion firstly when the first preset condition is met; and controlling the first group of burners 21 to ignite the third group of burners 23 when the required load is greater than the load supplied by the first group of burners 21 starting combustion.

Specifically, when the required load is greater than the load supplied by the first group of burners 21 starting combustion, the gas transmission channel 51 corresponding to the third group of burners 23 is opened, so that the first group of burners 21 can ignite the third group of burners 23, thereby enabling the gas water heating device to enter the third working state from the first working state.

Further, when the required load is greater than the load supplied by the first group of burners 21 and the third group of burners 23 in operation, the third group of burners 23 are controlled to ignite the second group of burners 22. Specifically, the gas transmission channel 51 corresponding to the second group of burners 22 may be opened, so that the third group of burners 23 can ignite the second group of burners 22, thereby enabling the gas water heating device to enter the fifth working state from the third working state.

Step 200 may further include: controlling the second group of burners 22 to start combustion firstly when the first preset condition is met subsequently; and controlling the second group of burners 22 to ignite the third group of burners 23 when the required load is greater than the load supplied by the second group of burners 22 starting combustion.

Specifically, when the required load is greater than the load supplied by the second group of burners 22 starting combustion, the gas transmission channel 51 corresponding to the third group of burners 23 is opened, so that the second group of burners 22 can ignite the third group of burners 23, thereby enabling the gas water heating device to enter the fourth working state from the second working state.

Further, when the required load is greater than the load supplied by the second group of burners 22 and the third group of burners 23 in operation, the third group of burners 23 are controlled to ignite the first group of burners 21. Specifically, the gas transmission channel 51 corresponding to the first group of burners 21 may be opened, so that the third group of burners 23 can ignite the first group of burners 21, thereby enabling the gas water heating device to enter the fifth working state from the fourth working state.

In a second embodiment, FIG. 3 illustrates a structural diagram of a gas water heating device according to the second embodiment of the present disclosure. As illustrated in FIG. 3, in this embodiment, the combustion device 2 may include a third group of burners 23 and a fourth group of burners 24 which are provided between the first group of burners 21 and the second group of burners 22, wherein the third group of burners 23 are closer to the second group of burners 22 than the fourth group of burners 24. The third group of burners 23 may be ignited by the second group of burners 22 or the fourth group of burners 24 in a combustion state, and the fourth group of burners 24 may be ignited by the first group of burners 21 or the third group of burners 23 in a combustion state. The first group of burners 21, the fourth group of burners 24, the third group of burners 23 and the second group of burners 22 are provided in close proximity to each other in sequence.

Correspondingly, the distributor 5 may include at least four gas transmission channels 51 that can be independently opened and closed. The at least four gas transmission channels 51 are provided corresponding to the at least four groups of burners, respectively. Correspondingly, the combustion device 2 may include at least four fire row burners 26, wherein the first group of burners 21 include at least one fire row burner 26, the second group of burners 22 include at least one fire row burner 26, the third group of burners 23 include at least one fire row burner 26, and the fourth group of burners 24 include at least one fire row burner 26.

As illustrated in FIG. 3, the first group of burners 21 are provided opposite to a part of the heat exchanger 1, the second group of burners 22 are provided opposite to a part of the heat exchanger 1, the third group of burners 23 are provided opposite to a part of the heat exchanger 1, and the fourth group of burners 24 are provided opposite to a part of the heat exchanger 1. That is, the heat exchanger 1 may include a plurality of areas, such as a first area 11, a second area 12, a third area 13, and a fourth area 14. The first group of burners 21 are mainly used to heat the first area 11 of the heat exchanger 1, the second group of burners 22 are mainly used to heat the second area 12 of the heat exchanger 1, the third group of burners 23 are mainly used to heat the third area 13 of the heat exchanger 1, and the fourth group of burners 24 are mainly used to heat the fourth area 14 of the heat exchanger 1. When there is no guiding mechanism to guide flue gas between the heat exchanger 1 and the combustion device 2, the third area 13 of the heat exchanger 1 is substantially located directly above the third group of burners 23, and the fourth area 14 of the heat exchanger 1 is substantially located directly above the fourth group of burners 24. The third area 13 and the fourth area 14 of the heat exchanger 1 are located between the first area 11 and the second area 12, and the third area 13 is closer to the second area 12 than the fourth area 14. Due to the third area 13 and the fourth area 14, there is a spacing distance between the first area 11 and the second area 12 of the heat exchanger 1. When the third group of burners 23 need to enter a combustion state, the gas transmission channel 51 corresponding to the third group of burners 23 is opened, and the flame of the fourth group of burners 24 or the second group of burners 22 having been in a combustion state can ignite the gas of the third group of burners 23, so as to enable the third group of burners 23 to enter a combustion state. When the fourth group of burners 24 need to enter a combustion state, the gas transmission channel 51 corresponding to the fourth group of burners 24 is opened, and the flame of the first group of burners 21 or the third group of burners 23 having been in a combustion state can ignite the gas of the fourth group of burners 24, so as to enable the fourth group of burners 24 to enter a combustion state.

In this embodiment, when the gas water heating device is in the first working state, the third group of burners 23 and the fourth group of burners 24 are in an off state. When the gas water heating device is in the second working state, the third group of burners 23 and the fourth group of burners 24 are in an off state.

In this embodiment, the gas water heating device may further include a third working state and a fourth working state. In the third working state, the first group of burners 21 and the fourth group of burners 24 are in a combustion state, and the second group of burners 22 and the third group of burners 23 are in an off state. At this time, the gas transmission channels 51 corresponding to the first group of burners 21 and the fourth group of burners 24 are in an open state, and the gas transmission channels 51 corresponding to the second group of burners 22 and the third group of burners 23 are in a closed state. In the fourth state, the second group of burners 22 and the third group of burners 23 are in a combustion state, and the first group of burners 21 and the fourth group of burners 24 are in an off state. At this time, the gas transmission channels 51 corresponding to the second group of burners 22 and the third group of burners 23 are in an open state, and the gas transmission channels 51 corresponding to the first group of burners 21 and the fourth group of burners 24 are in a closed state.

Further, in this embodiment, the gas water heating device may further include a fifth working state and a sixth working state. In the fifth working state, the first group of burners 21, the fourth group of burners 24, and the third group of burners 23 are in combustion state, and the second group of burners 22 are in an off state. At this time, the gas transmission channels 51 corresponding to the first group of burners 21, the fourth group of burners 24, and the third group of burners 23 are in an open state, and the gas transmission channel 51 corresponding to the second group of burners 22 is in a closed state. In the sixth working state, the second group of burners 22, the third group of burners 23, and the fourth group of burners 24 are in a combustion state, and the first group of burners 21 are in an off state. At this time, the gas transmission channels 51 corresponding to the second group of burners 22, the third group of burners 23, and the fourth group of burners 24 are in an open state, and the gas transmission channel 51 corresponding to the first group of burners 21 is in a closed state.

Still further, the gas water heating device may further include a seventh working state. In the seventh working state, all of the first group of burners 21, the second group of burners 22, the fourth group of burners 24, and the third group of burners 23 are in a combustion state. At this time, all of the gas transmission channels 51 corresponding to the first group of burners 21, the second group of burners 22, the fourth group of burners 24, and the third group of burners 23 are in an open state.

Step S100 may further include: controlling the first group of burners 21 to start combustion firstly when the first preset condition is met; and controlling the first group of burners 21 to ignite the fourth group of burners 24 when the required load is greater than the load supplied by the first group of burners 21 starting combustion. Specifically, when the required load is greater than the load supplied by the first group of burners 21 starting combustion, the gas transmission channel 51 corresponding to the fourth group of burners 24 is opened, so that the first group of burners 21 can ignite the fourth group of burners 24, thereby enabling the gas water heating device to enter the third working state from the first working state.

Further, when the required load is greater than the load supplied by the first group of burners 21 and the fourth group of burners 24 in operation, the fourth group of burners 24 are controlled to ignite the third group of burners 23. Specifically, the gas transmission channel 51 corresponding to the third group of burners 23 may be opened, so that the fourth group of burners 24 can ignite the third group of burners 23, thereby enabling the gas water heating device to enter the fifth working state from the third working state.

Still further, when the required load is greater than the load supplied by the first group of burners 21, the fourth group of burners 24, and the third group of burners 23 in operation, the third group of burners 23 are controlled to ignite the second group of burners 22. Specifically, the gas transmission channel 51 corresponding to the second group of burners 22 may be opened, so that the third group of burners 23 can ignite the second group of burners 22, thereby enabling the gas water heating device to enter the seventh working state from the fifth working state.

Step S200 may further include: controlling the second group of burners 22 to start combustion firstly when the first preset condition is met subsequently; and controlling the second group of burners 22 to ignite the third group of burners 23 when the required load is greater than the load supplied by the second group of burners 22 starting combustion. Specifically, when the required load is greater than the load supplied by the second group of burners 22 starting combustion, the gas transmission channel 51 corresponding to the third group of burners 23 is opened, so that the second group of burners 22 can ignite the third group of burners 23, thereby enabling the gas water heating device to enter the fourth working state from the second working state.

Further, when the required load is greater than the load supplied by the second group of burners 22 and the third group of burners 23 in operation, the third group of burners 23 are controlled to ignite the fourth group of burners 24. Specifically, the gas transmission channel 51 corresponding to the fourth group of burners 24 may be opened, so that the third group of burners 23 can ignite the fourth group of burners 24, thereby enabling the gas water heating device to enter the sixth working state from the fourth working state.

Still further, when the required load is greater than the load supplied by the second group of burners 22, the fourth group of burners 24, and the third group of burners 23 in operation, the fourth group of burners 24 are controlled to ignite the first group of burners 21. Specifically, the gas transmission channel 51 corresponding to the first group of burners 21 may be opened, so that the fourth group of burners 24 can ignite the first group of burners 21, thereby enabling the gas water heating device to enter the seventh working state from the sixth working state.

With the above control method of the gas water heating device, the gas water heating device can meet different required loads. In addition, when the required load is less than or equal to the load supplied by the second group of burners 22 and the third group of burners 23 in operation, or less than or equal to the load supplied by the first group of burners 21 and the fourth group of burners 24 in operation, the first group of burners 21 and the fourth group of burners 24 on one hand and the second group of burners 22 and the third group of burners 23 on the other hand may operate alternately to supply heat energy to the heat exchanger 1, thereby avoiding the problem that one or more groups of burners at the same position are always used to heat the heat exchanger 1, which causes a local area of the heat exchanger 1 corresponding to the burners to be prone to failure due to high-intensity heating for a long time, and thereby prolonging the service life of the gas water heating device.

In a third embodiment, FIG. 4 illustrates a structural diagram of a gas water heating device according to the third embodiment of the present disclosure. As illustrated in FIG. 4, in this embodiment, the combustion device 2 may include: a third group of burners 23 which are provided between the first group of burners 21 and the second group of burners 22; and a fourth group of burners 24, wherein the first group of burners 21 are provided between the third group of burners 23 and the fourth group of burners 24. The third group of burners 23 may be ignited by the second group of burners 22 or the first group of burners 21 in a combustion state, and the fourth group of burners 24 may be ignited by the first group of burners 21 in a combustion state. The fourth group of burners 24, the first group of burners 21, the third group of burners 23 and the second group of burners 22 are provided in close proximity to each other in sequence.

Correspondingly, the distributor 5 may include at least four gas transmission channels 51 that can be independently opened and closed. The at least four gas transmission channels 51 are provided corresponding to the at least four groups of burners, respectively. The heat exchanger 1 may include a plurality of areas, such as a first area 11, a second area 12, a third area 13, and a fourth area 14. The above structure is similar to that in the second embodiment, and will not be repeated here. In which, when there is no guiding mechanism to guide flue gas between the heat exchanger 1 and the combustion device 2, the third area 13 of the heat exchanger 1 is substantially located directly above the third group of burners 23, and the fourth area 14 of the heat exchanger 1 is substantially located directly above the fourth group of burners 24. The third area 13 of the heat exchanger 1 is located between the first area 11 and the second area 12, and the first area 11 is located between the fourth area 14 and the third area 13. Due to the third area 13, there is a spacing distance between the first area 11 and the second area 12 of the heat exchanger 1. When the third group of burners 23 need to enter a combustion state, the gas transmission channel 51 corresponding to the third group of burners 23 is opened, and the flame of the first group of burners 21 or the second group of burners 22 having been in a combustion state can ignite the gas of the third group of burners 23, so as to enable the third group of burners 23 to enter a combustion state. When the fourth group of burners 24 need to enter a combustion state, the gas transmission channel 51 corresponding to the fourth group of burners 24 is opened, and the flame of the first group of burners 21 having been in a combustion state can ignite the gas of the fourth group of burners 24, so as to enable the fourth group of burners 24 to enter a combustion state.

In this embodiment, when the gas water heating device is in the first working state, the third group of burners 23 and the fourth group of burners 24 are in an off state. When the gas water heating device is in the second working state, the third group of burners 23 and the fourth group of burners 24 are in an off state.

In this embodiment, the gas water heating device may further include a third working state and a fourth working state. In the third working state, the first group of burners 21 and the fourth group of burners 24 are in a combustion state, and the second group of burners 22 and the third group of burners 23 are in an off state. At this time, the gas transmission channels 51 corresponding to the first group of burners 21 and the fourth group of burners 24 are in an open state, and the gas transmission channels 51 corresponding to the second group of burners 22 and the third group of burners 23 are in a closed state. In the fourth working state, the second group of burners 22 and the third group of burners 23 are in a combustion state, and the first group of burners 21 and the fourth group of burners 24 are in an off state. At this time, the gas transmission channels 51 corresponding to the second group of burners 22 and the third group of burners 23 are in an open state, and the gas transmission channels 51 corresponding to the first group of burners 21 and the fourth group of burners 24 are in a closed state.

Further, in this embodiment, the gas water heating device may further include a fifth working state and a sixth working state. In the fifth working state, the first group of burners 21, the fourth group of burners 24, and the third group of burners 23 are in combustion state, and the second group of burners 22 are in off state. At this time, the gas transmission channels 51 corresponding to the first group of burners 21, the fourth group of burners 24, and the third group of burners 23 are in an open state, and the gas transmission channel 51 corresponding to the second group of burners 22 is in a closed state. In the sixth working state, the second group of burners 22, the third group of burners 23, and the first group of burners 21 are in a combustion state, and the fourth group of burners 24 are in an off state. At this time, the gas transmission channels 51 corresponding to the second group of burners 22, the third group of burners 23, and the first group of burners 21 are in an open state, and the gas transmission channel 51 corresponding to the fourth group of burners 24 is in a closed state.

Still further, the gas water heating device may further include a seventh working state. In the seventh working state, all of the first group of burners 21, the second group of burners 22, the fourth group of burners 24, and the third group of burners 23 are in a combustion state. At this time, all of the gas transmission channels 51 corresponding to the first group of burners 21, the second group of burners 22, the fourth group of burners 24, and the third group of burners 23 are in an open state.

Step S100 may further include: controlling the first group of burners 21 to start combustion firstly when the first preset condition is met; and controlling the first group of burners 21 to ignite the fourth group of burners 24 when the required load is greater than the load supplied by the first group of burners 21 starting combustion. Specifically, when the required load is greater than the load supplied by the first group of burners 21 starting combustion, the gas transmission channel 51 corresponding to the fourth group of burners 24 is opened, so that the first group of burners 21 can ignite the fourth group of burners 24, thereby enabling the gas water heating device to enter the third working state from the first working state.

Further, when the required load is greater than the load supplied by the first group of burners 21 and the fourth group of burners 24 in operation, the first group of burners 21 are controlled to ignite the third group of burners 23. Specifically, the gas transmission channel 51 corresponding to the third group of burners 23 may be opened, so that the first group of burners 21 can ignite the third group of burners 23, thereby enabling the gas water heating device to enter the fifth working state from the third working state.

Still further, when the required load is greater than the load supplied by the first group of burners 21, the fourth group of burners 24, and the third group of burners 23 in operation, the third group of burners 23 are controlled to ignite the second group of burners 22. Specifically, the gas transmission channel 51 corresponding to the second group of burners 22 may be opened, so that the third group of burners 23 can ignite the second group of burners 22, thereby enabling the gas water heating device to enter the seventh working state from the fifth working state.

Step S200 may further include: controlling the second group of burners 22 to start combustion firstly when the first preset condition is met subsequently; and controlling the second group of burners 22 to ignite the third group of burners 23 when the required load is greater than the load supplied by the second group of burners 22 starting combustion. Specifically, when the required load is greater than the load supplied by the second group of burners 22 starting combustion, the gas transmission channel 51 corresponding to the third group of burners 23 is opened, so that the second group of burners 22 can ignite the third group of burners 23, thereby enabling the gas water heating device to enter the fourth working state from the second working state.

Further, when the required load is greater than the load supplied by the second group of burners 22 and the third group of burners 23 in operation, the third group of burners 23 are controlled to ignite the first group of burners 21. Specifically, the gas transmission channel 51 corresponding to the first group of burners 21 may be opened, so that the third group of burners 23 can ignite the first group of burners 21, thereby enabling the gas water heating device to enter the sixth working state from the fourth working state.

Still further, when the required load is greater than the load supplied by the second group of burners 22, the first group of burners 21, and the third group of burners 23 in operation, the first group of burners 21 are controlled to ignite the fourth group of burners 24. Specifically, the gas transmission channel 51 corresponding to the fourth group of burners 24 may be opened, so that the first group of burners 21 can ignite the fourth group of burners 24, and then enter the seventh working state from the sixth working state.

The control method of the gas water heating device in this embodiment can have the same advantageous effects as in the second embodiment.

In a fourth embodiment, FIG. 5 illustrates a structural diagram of a gas water heating device according to the fourth embodiment of the present disclosure. As illustrated in FIG. 5, the combustion device 2 may further include a third group of burners 23, a fourth group of burners 24, and a fifth group of burners 25 which are provided between the first group of burners 21 and the second group of burners 22, wherein the third group of burners 23 are closer to the second group of burners 22 than the fourth group of burners 24, and the fifth group of burners 25 are located between the third group of burners 23 and the fourth group of burners 24. The third group of burners 23 may be ignited by the second group of burners 22 or the fifth group of burners 25 in a combustion state, and the fourth group of burners 24 may be ignited by the first group of burners 21 or the fifth group of burners 25 in a combustion state. As feasible, the first group of burners 21, the fourth group of burners 24, the fifth group of burners 25, the third group of burners 23, and the second group of burners 22 are provided in close proximity to each other in sequence.

Correspondingly, the distributor 5 may include at least five gas transmission channels 51 that can be independently opened and closed. The at least five gas transmission channels 51 are provided corresponding to the at least five groups of burners, respectively. The heat exchanger 1 may include a plurality of areas, such as a first area 11, a second area 12, a third area 13, a fourth area 14, and a fifth area 15. The above structure is similar to that in any other embodiment aforementioned, and will not be repeated here. In which, when there is no guiding mechanism to guide flue gas between the heat exchanger 1 and the combustion device 2, the third area 13 of the heat exchanger 1 is substantially located directly above the third group of burners 23, the fourth area 14 of the heat exchanger 1 is substantially located directly above the fourth group of burners 24, and the fifth area 15 of the heat exchanger 1 is substantially located directly above the fifth group of burners 25. The fourth area 14, the fifth area 15, and the third area 13 of the heat exchanger 1 are located between the first area 11 and the second area 12, the fifth area 15 is located between the fourth area 14 and the third area 13, and the third area 13 is closer to the second area 12 than the fourth area 14. Due to the fourth area 14, the fifth area 15, and the third area 13, there is a spacing distance between the first area 11 and the second area 12 of the heat exchanger 1. When the third group of burners 23 need to enter a combustion state, the gas transmission channel 51 corresponding to the third group of burners 23 is opened, and the flame of the second group of burners 22 or the fifth group of burners 25 having been in a combustion state can ignite the gas of the third group of burners 23, so as to enable the third group of burners 23 to enter a combustion state. When the fourth group of burners 24 need to enter a combustion state, the gas transmission channel 51 corresponding to the fourth group of burners 24 is opened, and the flame of the first group of burners 21 or the fifth group of burners 25 having been in a combustion state can ignite the gas of the fourth group of burners 24, so as to enable the fourth group of burners 24 to enter a combustion state. When the fifth group of burners 25 need to enter a combustion state, the gas transmission channel 51 corresponding to the fifth group of burners 25 is opened, and the flame of the third group of burners 23 or the fourth group of burners 24 having been in a combustion state can ignite the gas of the fifth group of burners 25, so as to enable the fifth group of burners 25 to enter a combustion state.

In this embodiment, when the gas water heating device is in the first working state, the third group of burners 23, the fourth group of burners 24, and the fifth group of burners 25 are in an off state. When the gas water heating device is in the second working state, the third group of burners 23, the fourth group of burners 24, and the fifth group of burners 25 are in an off state.

In this embodiment, the gas water heating device may further include a third working state and a fourth working state. In the third working state, the first group of burners 21 and the fourth group of burners 24 are in a combustion state, and the second group of burners 22, the third group of burners 23, and the fifth group of burners 25 are in an off state. At this time, the gas transmission channels 51 corresponding to the first group of burners 21 and the fourth group of burners 24 are in an open state, and the gas transmission channels 51 corresponding to the second group of burners 22, the third group of burners 23, and the fifth group of burners 25 are in a closed state. In the fourth working state, the second group of burners 22 and the third group of burners 23 are in a combustion state, and the first group of burners 21, the fourth group of burners 24, and the fifth group of burners 25 are in an off state. At this time, the gas transmission channels 51 corresponding to the second group of burners 22 and the third group of burners 23 are in an open state, and the gas transmission channels 51 corresponding to the first group of burners 21, the fourth group of burners 24, and the fifth group of burners 25 are in a closed state. Further, in this embodiment, the gas water heating device may further include a fifth working state and a sixth working state. In the fifth working state, the first group of burners 21, the fourth group of burners 24, and the fifth group of burners 25 are in a combustion state, and the second group of burners 22 and the third group of burners 23 are in an off state. At this time, the gas transmission channels 51 corresponding to the first group of burners 21, the fourth group of burners 24, and the fifth group of burners 25 are in an open state, and the gas transmission channels 51 corresponding to the second group of burners 22 and the third group of burners 23 are in a closed state. In the sixth working state, the second group of burners 22, the third group of burners 23, and the fifth group of burners 25 are in a combustion state, and the first group of burners 21 and the fourth group of burners 24 are in an off state. At this time, the gas transmission channels 51 corresponding to the second group of burners 22, the third group of burners 23, and the fifth group of burners 25 are in an open state, and the gas transmission channels 51 corresponding to the first group of burners 21 and the fourth group of burners 24 are in a closed state.

Still further, the gas water heating device may further include a seventh working state. In the seventh working state, all of the first group of burners 21, the second group of burners 22, the third group of burners 23, the fourth group of burners 24, and the fifth group of burners 25 are in a combustion state. At this time, all of the gas transmission channels 51 corresponding to the first group of burners 21, the second group of burners 22, the fourth group of burners 24, the third group of burners 23, and the fifth group of burners 25 are in an open state.

Step S100 may further include: controlling the first group of burners 21 to start combustion firstly when the first preset condition is met; and controlling the first group of burners 21 to ignite the fourth group of burners 24 when the required load is greater than the load supplied by the first group of burners 21 starting combustion. Specifically, when the required load is greater than the load supplied by the first group of burners 21 starting combustion, the gas transmission channel 51 corresponding to the fourth group of burners 24 is opened, so that the first group of burners 21 can ignite the fourth group of burners 24, thereby enabling the gas water heating device to enter the third working state from the first working state.

Further, when the required load is greater than the load supplied by the first group of burners 21 and the fourth group of burners 24 in operation, the fourth group of burners 24 are controlled to ignite the fifth group of burners 25. Specifically, the gas transmission channel 51 corresponding to the fifth group of burners 25 may be opened, so that the fourth group of burners 24 can ignite the fifth group of burners 25, thereby enabling the gas water heating device to enter the fifth working state from the third working state.

Still further, when the required load is greater than the load supplied for the first group of burners 21, the fourth group of burners 24, and the fifth group of burners 25 in operation, the fifth group of burners 25 are controlled to ignite the third group of burners 23, and then the second group of burners 22 are ignited by the third group of burners 23. Specifically, the gas transmission channel 51 corresponding to the third group of burners 23 may be opened firstly, so that the fifth group of burners 25 can ignite the third group of burners 23, and then the gas transmission channel 51 corresponding to the second group of burners 22 may be opened, so that the third group of burners 23 can ignite the second group of burners 22, thereby enabling the gas water heating device to enter the seventh working state from the fifth working state.

Step S200 may further include: controlling the second group of burners 22 to start combustion firstly when the first preset condition is met subsequently; and controlling the second group of burners 22 to ignite the third group of burners 23 when the required load is greater than the load supplied by the second group of burners 22 starting combustion. Specifically, when the required load is greater than the load supplied by the second group of burners 22 starting combustion, the gas transmission channel 51 corresponding to the third group of burners 23 is opened, so that the second group of burners 22 can ignite the third group of burners 23, thereby enabling the gas water heating device to enter the fourth working state from the second working state.

Further, when the required load is greater than the load supplied by the second group of burners 22 and the third group of burners 23 in operation, the third group of burners 23 are controlled to ignite the fifth group of burners 25. Specifically, the gas transmission channel 51 corresponding to the fifth group of burners 25 may be opened, so that the third group of burners 23 can ignite the fifth group of burners 25, thereby enabling the gas water heating device to enter the sixth working state from the fourth working state.

Still further, when the required load is greater than the load supplied by the second group of burners 22, the fifth group of burners 25, and the third group of burners 23 in operation, the fifth group of burners 25 are controlled to ignite the fourth group of burners 24, and then the fourth group of burners 24 are controlled to ignite the first group of burners 21. Specifically, the gas transmission channel 51 corresponding to the fourth group of burners 24 may be opened firstly, so that the fifth group of burners 25 can ignite the fourth group of burners 24, and then the gas transmission channel 51 corresponding to the first group of burners 21 may be opened, so that the fourth group of burners 24 can ignite the first group of burners 21, thereby enabling the gas water heating device to enter the seventh working state from the sixth working state.

With the control method of the gas water heating device, the gas water heating device can meet different required loads, and when the required load is less than or equal to the load supplied by the second group of burners 22 and the third group of burners 23 in operation, or less than or equal to the load supplied by the first group of burners 21 and the fourth group of burners 24 in operation, the first group of burners 21 and the fourth group of burners 24 on one hand and the second group of burners 22 and the third group of burners 23 on the other hand may operate alternately to supply heat energy to the heat exchanger 1, each time the gas water heating device is turned on for heating. In the above process, the first group of burners 21 and the fourth group of burners 24 on one hand and the second group of burners 22 and the third group of burners 23 on the other hand are always spaced by the fifth group of burners 25, so that when the first group of burners 21 and the fourth group of burners 24 keep combustion, the leftmost side of the third area 13 of the heat exchanger 1 corresponding to the third group of burners 23 is heated to a much-reduced degree. Similarly, when the second group of burners 22 and the third group of burners 23 keep combustion, the rightmost side of the fourth area 14 of the heat exchanger 1 corresponding to the fourth group of burners 24 is heated to a much-reduced degree. As a result, no matter when the first group of burners 21 and the fourth group of burners 24 keep combustion or when the second group of burners 22 and the third group of burners 22 keep combustion, the leftmost side of the third area 13 of the heat exchanger 1 corresponding to the third group of burners 23 or the rightmost side of the fourth area 11 of the heat exchanger 1 corresponding to the fourth group of burners 24 will not be in a high-intensity heating state for a long time. Therefore, the leftmost side of the third area 13 of the heat exchanger 1 corresponding to the third group of burners 23 and the rightmost side of the fourth area 14 of the heat exchanger 1 corresponding to the fourth group of burners 24 are not prone to failure, thereby prolonging the service life of the gas water heating device to a certain extent.

As described in the background, the gas water heating device heats water in a small load or a medium load in most cases compared with in the full load. In the above way, when the first group of burners 21 and the fourth group of burners 24 keep combustion, or when the second group of burners 22 and the third group of burners 23 keep combustion, or when the first group of burners 21 keeps combustion or when the second group of burners 22 keeps combustion, the gas water heater can heat water just in a small load or a medium load. Secondly, not only different groups of burners in the combustion device 2 mainly heat different areas of the heat exchanger 1, so that different areas of the heat exchanger 1 can participate in the process of heat exchange and water heating after the gas water heating device starts heating for many times, but also the situation that the middle area of the heat exchanger 1 is in high-intensity heating and heat-exchange for a long time can be avoided, thereby greatly improving the anti-scaling capability of the heat exchanger 1, and thus prolonging the service life of the heat exchanger 1. In particular, the service life of the heat exchanger 1 is significantly improved in regions where the water is hard, and can be about twice the original service life of the heat exchanger 1.

All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for all purposes. The phrase “substantially composed of . . . ” describing a combination should include the determined elements, compositions, components or steps, and any other element, composition, component, or step which substantively does not affect the basic novel features of the combination. When the term “comprise” or “include” is used to describe the combination of elements, compositions, components or steps herein, embodiments substantially consisting of the elements, compositions, components or steps are also contemplated. Herein the term “may” is used to indicate that any described attribute covered by “may” is optional. Multiple elements, compositions, components, or steps can be provided by a single integrated element, composition, component or step. Alternatively, a single integrated element, composition, component or step may be divided into multiple separate elements, compositions, components or steps. The disclosure “a/an” or “one” used to describe the elements, compositions, components or steps is not intended to exclude other elements, compositions, components or steps.

The embodiments in the Specification are each described in a progressive manner. Each embodiment lays an emphasis on its difference from other embodiments, and the same or similar parts of the embodiments can refer to each other. The above embodiments are only used to describe the technical ideas and characteristics of the present disclosure, and the purpose is to allow a person skilled in the art to understand the contents of the present disclosure and implement them accordingly, rather than limiting the protection scope of the present disclosure. Any equivalent change or modification made according to the spirit essence of the present disclosure shall fall within the protection scope of the present disclosure.