FLOWRATE-INCREASING DRAIN HEAD AND DRAIN VALVE

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is based on and claims the benefit of priority from Chinese Patent Application No. 2024117144668, filed on Nov. 26, 2024, the entirety of which is incorporated by reference herein.

TECHNICAL FIELD

The present disclosure relates to the technical field of sanitary ware, in particular to a flowrate-increasing drain head and a drain valve.

BACKGROUND

In the sanitary ware industry, “drain valves” inside a toilet bowl, a wall-mounted water tank, a hidden water tank and other sanitary ware products are key parts responsible for flushing excreta into a sewer. A flushing effect of the product is directly related to cleanliness of flushing, and a large part of the flushing effect depends on a drain flowrate. With the same water consumption, if a drain flowrate of the drain valve increases, a greater flushing pressure is formed.

A traditional drain valve usually comprises a drain head and a switch mechanism to control drain of the drain head. The drain head is usually straight, that is, a drain hole inside the drain head extends along a straight line. Because the drain valve is mounted in a water tank, and a cross section of the water tank is much larger than a diameter of the drain hole, when the existing drain valve is opened, surrounding water will rush to an upper end of the drain hole, flow through the drain hole, and then be discharged from a lower end of the drain hole. In this process, the water-flow is very chaotic and irregular, and when a large amount of water in the water tank enters the narrow drain hole, it is easy to form an effect of local vacuum adsorption (for example, when a mineral water bottle full of water is inverted and then opened, the local vacuum adsorption effect will be formed, resulting in low drain speed), which leads to a drain speed of the existing drain head is not fast enough.

SUMMARY

The present disclosure aims at solving at least one of the technical problems in the existing technology. In view of this, the present disclosure provides a flowrate-increasing drain head which can change a liquid flowing through the flowrate-increasing drain head from an irregular and disordered state to a regular downward rotating vortex, thereby increasing a drain flow rate, and finally enabling sanitary ware adopting the flowrate-increasing drain head to be flushed with a higher flow rate, thereby improving a flushing effect of the sanitary ware.

The present disclosure further provides a drain valve provided with the flowrate-increasing drain head mentioned above.

A flowrate-increasing drain head according to an embodiment of a first aspect of the present disclosure comprises a body, wherein the body defines a drain hole, and a first diversion structure is arranged corresponding to the drain hole; wherein the first diversion structure comprises a plurality of diversion trenches distributed at intervals around an axis of the drain hole, and the diversion trenches are configured for driving liquid passing through the diversion trenches to form a downward rotating motion to increase a flow rate of the liquid.

The flowrate-increasing drain head according to the embodiment of the present disclosure at least has the following beneficial effects: the first diversion structure is provided corresponding to the drain hole of the flowrate-increasing drain head provided by the present disclosure. The water will pass through the first diversion structure during the discharge from the drain hole. The first diversion structure can induce a vortex effect, so that the water-flow flowing through the first diversion structure changes from an irregular and disordered state to a regular rotating downward vortex, and meanwhile, the effect of local vacuum adsorption is destroyed. Therefore, the flow rate is finally increased through a vortex flowrate-increasing effect of the first diversion structure, and the drain flowrate is improved, so that the sanitary ware adopting the flowrate-increasing drain head provided by the present disclosure can be flushed with water-flow at a higher flowrate, thereby the flushing effect of the sanitary ware is improved.

According to some embodiments of the present disclosure, the diversion trenches are spirally arranged.

According to some embodiments of the present disclosure, the diversion trenches are recessed in an inner wall of the drain hole, and each of a plurality of diversion portions is formed between a respective trench wall between every two adjacent diversion trenches; or, the first diversion structure comprises a plurality of spirally arranged diversion ribs, the diversion ribs are arranged in the inner wall of the drain hole, and each of the diversion trenches is enclosed by the corresponding two adjacent diversion ribs and the inner wall of the drain hole.

According to some embodiments of the present disclosure, a rotating direction of the diversion trenches is counterclockwise or clockwise.

According to some embodiments of the present disclosure, a respective distance between a bottom wall of each of the diversion trenches and the axis of the drain hole gradually decreases along a drain direction of the drain hole.

According to some embodiments of the present disclosure, the first diversion structure includes a diversion hoop, and the diversion trenches are defined on an inner wall of the diversion hoop.

According to some embodiments of the present disclosure, an inner diameter D of an end of the drain hole satisfies: 30 mm≤D≤120 mm.

According to some embodiments of the present disclosure, a pipeline connecting structure is provided on an end of the body.

According to some embodiments of the present disclosure, the pipeline connecting structure comprises a stud and a bottom hook, the stud is connected with the body, the bottom hook is screwed to the stud, and the bottom hook is arranged opposite to the drain hole.

According to some embodiments of the present disclosure, the pipeline connecting structure comprises a connecting thread arranged on the body.

According to some embodiments of the present disclosure, the flowrate-increasing drain head is applicable to a cylinder drain valve or a float drain valve.

A drain valve according to an embodiment of a second aspect of the present disclosure comprises the flowrate-increasing drain head mentioned above.

The drain valve according to the embodiment of the present disclosure at least has the following beneficial effects: the drain valve provided by the present disclosure can improve a drain flowrate by adopting the flowrate-increasing drain head mentioned above; thus, sanitary ware adopting the drain valve provided by the present disclosure can be flushed with a higher flowrate during flushing, thereby improving a flushing effect of the sanitary ware.

Additional aspects and advantages of the present disclosure will be given in part in the following description, and will become apparent in part from the following description, or will be learned through the practice of the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and/or additional aspects and advantages of the present disclosure will be more apparent from the following description of the embodiments in conjunction with the accompanying drawings, wherein:

FIG. 1 is a schematic diagram of a flowrate-increasing drain head (which is applied to a float drain valve and provided with diversion trenches recessed on an inner wall of a drain hole and a body provided with a connecting thread) according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a flowrate-increasing drain head (which is applied to a float drain valve and provided with diversion ribs protruded out of an inner wall of a drain hole and a body provided with a connecting thread) according to an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of a flowrate-increasing drain head (which is applied to a float drain valve and provided with diversion trenches recessed on an inner wall of a drain hole and a body provided with a bottom hook) according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of a flowrate-increasing drain head (which is applied to a float drain valve and provided with diversion ribs protruded out of an inner wall of a drain hole and a body provided with a bottom hook) according to an embodiment of the present disclosure;

FIG. 5 is a sectional view of the flowrate-increasing drain head shown in FIG. 4;

FIG. 6 is a schematic diagram of a bottom portion of the flowrate-increasing drain head shown in FIG. 3;

FIG. 7 is a schematic diagram of a flowrate-increasing drain head (which is applied to a cylinder drain valve and provided with diversion trenches recessed on an inner wall of a drain hole and a body provided with a bottom hook) according to an embodiment of the present disclosure;

FIG. 8 is a schematic diagram of a flowrate-increasing drain head (which is applied to a cylinder drain valve and provided with diversion ribs protruded out of an inner wall of a drain hole and a body provided with a bottom hook) according to an embodiment of the present disclosure;

FIG. 9 is a schematic diagram of a flowrate-increasing drain head (which is suitable for a cylinder drain valve and provided with diversion trenches recessed on an inner wall of a drain hole and the body provided with a connecting thread) according to an embodiment of the present disclosure;

FIG. 10 is a schematic diagram of a flowrate-increasing drain head (which is applied to a cylinder drain valve and provided with diversion ribs protruded out of an inner wall of a drain hole and a body provided with a connecting thread) according to an embodiment of the present disclosure;

FIG. 11 is a sectional view of the flowrate-increasing drain head shown in FIG. 9;

FIG. 12 is a schematic diagram of a cylinder drain valve (with a flowrate-increasing drain head provided with a connecting thread) according to an embodiment of the present disclosure;

FIG. 13 is a schematic diagram of a cylinder drain valve (with a flowrate-increasing drain head provided with a bottom hook) according to an embodiment of the present disclosure;

FIG. 14 is a schematic diagram of a switch mechanism of the drain valve shown in FIG. 11;

FIG. 15 is a sectional view of the flowrate-increasing drain head shown in FIG. 12;

FIG. 16 is a schematic diagram of a float drain valve (with a flowrate-increasing drain head provided with a connecting thread) according to an embodiment of the present disclosure;

FIG. 17 is a schematic diagram of a float drain valve (with a flowrate-increasing drain head provided with a bottom hook) according to an embodiment of the present disclosure;

FIG. 18 is a schematic diagram of the drain valve (with a cover provided with a second diversion structure) shown in FIG. 15;

FIG. 19 is an exploded view of a cylinder drain valve (with a first diversion structure designed as a diversion hoop and a flowrate-increasing drain head provided with a connecting thread) according to an embodiment of the present disclosure; and

FIG. 20 is an exploded view of a float drain valve (with a first diversion structure designed as a diversion hoop and a flowrate-increasing drain head provided with a connecting thread) according to an embodiment of the present disclosure.

• • 01—cylinder drain valve, 02—float drain valve, 110—body, 111—drain hole, 112—first diversion structure, 1121—diversion trench, 1122—diversion portion, 1123—diversion rib, 1124—diversion hoop, 113—pipeline connecting structure, 1131—stud, 1132—bottom hook, 1133—connecting thread, 120—connecting portion, 121—avoidance hole, 122—water inlet, 123—clamping groove, 130—mounting portion, 131—connecting arm, 200—switch mechanism, 210—cover, 211—buoyancy portion, 220—second diversion structure, 221—diversion vane, 230—outer cylinder, 231—clamping portion, 240—operating portion, 250—transmission assembly, and 260—rotating arm.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The embodiments of the present disclosure will be described in detail hereinafter. Examples of the embodiments are shown in the accompanying drawings. The same or similar reference numerals throughout the drawings denote the same or similar elements or elements having the same or similar functions. The embodiments described below by reference to the accompanying drawings are exemplary and are intended only to explain the present disclosure and are not to be construed as limiting the present disclosure.

In the description of the present disclosure, it shall be understood that the orientation or position relation related to the orientation description, such as the orientation or position relation indicated by the upper, lower, front, rear, left, right, etc., is based on the orientation or position relation shown in the drawings, which is only used for convenience of description of the present disclosure and simplification of description instead of indicating or implying that the indicated device or element must have a specific orientation, and be constructed and operated in a specific orientation, and thus shall not be understood as a limitation to the present disclosure.

In the description of the present disclosure, the meaning of several refers to be one or more, and the meaning of multiple refers to be two or more. The meanings of greater than, less than, more than, etc., are understood as not including this number, while the meanings of above, below, within, etc., are understood as including this number. If there is a description to the first and second, it is only for the purpose of distinguishing technical features, and shall not be understood as indicating or implying relative importance, implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

In the description of the present disclosure, unless otherwise explicitly defined, words such as setting, mounting and connecting should be understood a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present disclosure in combination with the specific contents of the technical solutions.

Referring to FIG. 1 to FIG. 4 and FIG. 7 to FIG. 10, a flowrate-increasing drain head according to an embodiment of a first aspect of the present disclosure comprises a body 110, wherein the body 110 defines a drain hole 111, and a first diversion structure 112 is arranged corresponding to the drain hole 111. The first diversion structure 112 comprise a plurality of diversion trenches 1121 distributed at intervals around an axis of the drain hole 111, and the diversion trenches 1121 are configured for driving water passing through the diversion trenches 1121 to form a downward rotating motion to increase a flow rate of the water.

The flowrate-increasing drain head provided by the present disclosure is provided with the first diversion structure 112 corresponding to the drain hole 111. The water will flow through the first diversion structure 112 during the discharge from the drain hole 111. The first diversion structure 112 can induce a vortex effect, so that the water-flow flowing through the first diversion structure 112 changes from an irregular and disordered state to a regular rotating downward vortex. Meanwhile, the vortex defines usually a through hole without water flow in its center and the effect of local vacuum adsorption is destroyed, so that the flow rate is finally increased through a vortex flowrate-increasing effect of the first diversion structure 112, and the drain flowrate is improved. The sanitary ware adopting the flowrate-increasing drain head provided by an embodiment of the present disclosure can be flushed with water-flow at a higher speed, thereby the flushing effect of the sanitary ware is improved, the volume of water-flow required by flushing is reduced, and water saving is realized.

Referring to FIG. 1, FIG. 3, FIG. 7 and FIG. 9, according to some embodiments of the present disclosure, the diversion trenches 1121 are spirally arranged to effectively guide the water-flow to form a downward rotating vortex.

It should be noted that in some other embodiments, the diversion trenches 1121 can also be arranged in a straight line, and the diversion trenches 1121 are inclined relative to the axis of the drain hole 111, so that the diversion trenches 1121 can also guide the water-flow to form a downward rotating vortex.

Referring to FIG. 1, FIG. 3, FIG. 7 and FIG. 9, according to some embodiments of the present disclosure, the diversion trenches 1121 are recessed in an inner wall of the drain hole 111, and each diversion portion 1122 is formed between trench walls of the corresponding two adjacent diversion trenches 1121 in the inner wall of the drain hole 111. With this arrangement, the first diversion structure 112 can be formed by the body 110 through stamping and other processes.

Referring to FIG. 2, FIG. 4, FIG. 8 and FIG. 10, in some other embodiments, the first diversion structure 112 comprises a plurality of spirally arranged diversion ribs 1123, the diversion ribs 1123 are arranged in the inner wall of the drain hole 111, and each of the diversion trenches 1121 is enclosed by the corresponding two adjacent diversion ribs 1123 and the inner wall of the drain hole 111. An inner diameter of the drain hole 111 gradually decreases along a drain direction at positions where the diversion ribs 1123 are arranged. With this arrangement, the diversion ribs 1123 can be formed with the body 110 by mold casting, injection molding or other processes in the production process.

Referring to FIG. 5 and FIG. 11, according to some embodiments of the present disclosure, a distance between a bottom wall of the diversion trenches 1121 and the axis of the drain hole 111 gradually decreases along a drain direction of the drain hole 111. According to the principle of hydrodynamics, a diameter of a vortex formed by the water-flow passing through the drain hole 111 gradually decreases along the drain direction of the drain hole 111. With the arrangement above, the diversion trenches 1121 adapt to a diameter change of the vortex, so that the first diversion structure 112 can better guide the water-flow to form the vortex, thereby further improving a drain flow rate.

Referring to FIG. 5 and FIG. 11, according to some embodiments of the present disclosure, the distance s between the diversion portions 1122 (or the diversion ribs 1123) and the axis of the drain hole 111 remains constant or gradually increases along the drain direction of the drain hole 111. According to the principle of hydromechanics, the diameter of a vortex gradually decreases along the drain direction of the drain hole 111. By keeping the distance s between the diversion portions 1122 and the axis of the drain hole 111 constant or gradually increasing along the drain direction of the drain hole 111, one end of the diversion portions 1122 far from a water inlet end of the drain hole 111 avoids the vortex, such that the resistance of the diversion portions 1122 to the vortex can be reduced, thereby further improving the drain flow rate.

It is conceivable that the first diversion structure 112 can also be arrange in other ways. In an implementation, referring to FIGS. 19 and 20, the first diversion structure 112 can comprise a diversion hoop 1124, the diversion trenches 1121 and the diversion portions 1122 (or the diversion ribs 1123) are formed on an inner wall of the diversion hoop 1124, and the diversion hoop 1124 is located in the drain hole 111 and abuts against the inner wall of the drain hole 111. In the production process, the diversion hoop 1124 and the body 110 are formed separately and finally assembled together. By adopting this arrangement, an outer diameter of the diversion hoop 1124 can be adapted to the drain hole 111 of the existing drain head, so that the drain hole 111 of the existing drain head can be upgraded by equipped with the diversion hoop 1124. Alternatively, it can be contemplated that in some embodiments, the diversion hoop 1124 can also be arranged outside the drain hole 111, and the diversion hoop 1124 is in butt joint communication with the drain hole 111.

Referring to FIGS. 19 and 20, in a specific implementation, the above-mentioned diversion hoop 1124 can be installed on the drain valves such as the cylinder drain valve 01 or the float drain valve 02, and the flowrate-increasing drain head with the connecting thread 1133 or the bottom hook 1132.

Referring to FIG. 12 to FIG. 15, according to some embodiments of the present disclosure, the flowrate-increasing drain head above can be applied to a cylinder drain valve 01. A switch mechanism 200 of the cylinder drain valve 01 has a cylindrical outer shape.

Referring to FIG. 16 to FIG. 18, in some other embodiments, the flowrate-increasing drain head above can also be applied to a float drain valve 02. A switch mechanism 200 of the float drain valve 02 is set to be a float type.

It should be noted that the flowrate-increasing drain head provided by an embodiment of the present disclosure can also be applied to drain valves of other forms.

According to some embodiments of the present disclosure, the inner diameter D of an end of the drain hole 111 satisfies: 30 mm≤D≤120 mm. The diameter of the flowrate-increasing drain head is determined by the inner diameter D of an end of the drain hole 111 for discharging water flow. In a specific implementation, referring to FIGS. 5 and 11, the lower end of the drain hole 111 is configured for discharging water flow. Therefore, the inner diameter D of the lower end of the drain hole 111 can be set between 30 mm and 120 mm.

It is conceivable that the flowrate-increasing drain head provided by the present disclosure can also be set to other dimensions according to actual needs. For example, the inner diameter D of an end of the drain hole 111 can also be set to 25 mm or other values.

According to some embodiments of the present disclosure, rotating directions of the diversion trenches 1121 can be counterclockwise; correspondingly, rotating directions of the diversion portions 1122 are also counterclockwise.

It is conceivable that in some other embodiments, the rotating directions of the diversion trenches 1121 can also be clockwise; correspondingly, the rotating directions of the diversion portions 1122 are also clockwise.

Referring to FIG. 1 and FIG. 6, according to some embodiments of the present disclosure, the body 110 is provided with a pipeline connecting structure 113 at an end thereof, thereby facilitating connection of the flowrate-increasing drain head provided by the present disclosure with the pipeline.

Referring to FIG. 4 to FIG. 6, according to some embodiments of the present disclosure, the pipeline connecting structure 113 comprises a stud 1131 and a bottom hook 1132, the stud 1131 is connected with the body 110, the bottom hook 1132 is screwed to the stud 1131, the bottom hook 1132 is arranged opposite to the drain hole 111, and the bottom hook 1132 can be screwed around the stud 1131, thereby adjusting the distance between the bottom hook 1132 and the body 110. In the concrete implementation process, the bottom hook 1132 usually extends into the pipeline from an interface of the pipeline and is stuck at a position where an internal size of the pipeline changes. By rotating the body 110, the bottom hook 1132 rotates relative to the stud 1131, and then the body 110 is driven to be close to or away from the interface of the pipeline, so that the drain head can be fixed to the pipeline or detached from the pipeline.

According to a direction shown in FIG. 5, the axis of the drain hole 111 is in a vertical direction, the drain direction of the drain hole 111 is from top to bottom, the water inlet end of the drain hole 111 is the upper end of the drain hole 111, and the water outlet end of the drain hole 111 is the lower end of the drain hole 111. In this case, the switch mechanism 200 of the drain valve is located at an upper side of the body 110, and the bottom hook 1132 is located at a lower side of the body 110.

Referring to FIG. 3, FIG. 6 and FIG. 7, according to some embodiments of the present disclosure, when the pipeline connecting structure 113 is in the form of the bottom hook 1132, a mounting portion 130 is provided on the lower side of the body 110, the mounting portion 130 is connected with the body 110 through more than two connecting arms 131, and the stud 1131 is mounted on the mounting portion 130.

The pipeline connecting structure 113 can also be arranged in other ways. Referring to FIG. 1 and FIG. 9, according to some embodiments of the present disclosure, the pipeline connecting structure 113 can comprise a connecting thread 1133 arranged on the body 110, and the connecting thread 1133 can be an external thread or an internal thread.

Referring to FIG. 12 and FIG. 16, a drain valve according to an embodiment of a second aspect of the present disclosure comprises the flowrate-increasing drain head mentioned above. The drain valve provided by the present disclosure can improve a drain flowrate by adopting the flowrate-increasing drain head mentioned above; thus, sanitary ware adopting the drain valve provided by the present disclosure can be flushed with a higher flow rate, thereby improving a flushing effect of the sanitary ware, reducing the amount of water-flow required by flushing, and realizing water saving.

Referring to FIG. 12 and FIG. 18, according to some embodiments of the present disclosure, the drain valve above further comprises a switch mechanism 200. The switch mechanism 200 is located at a side of the body 110, and the switch mechanism 200 is connected with the body 110. The switch mechanism 200 is provided with a cover 210, and the cover 210 can be far away from or close to the drain hole 111 to open or close the drain hole 111. A second diversion structure 220 is provided on a side of the cover 210 facing the body 110, and the second diversion structure 220 is configured to cooperate with the first diversion structure 112 to drive the water-flow entering the drain hole 111 to rotate. Therefore, when the drain valve is mounted on a water tank and the cover 210 of the switch mechanism 200 is far away from the drain hole 111 to open the drain hole 111, water in the water tank flows into the upper end of the drain hole 111. During this process, the first diversion structure 112 drives the water-flow between the cover 210 and the drain hole 111 to rotate from below, and the second diversion structure 220 drives the water flow between the cover 210 and the drain hole 111 to rotate in the same direction from above, thus further improving a vortex effect, thereby further improving the drain speed.

Referring to FIG. 14, FIG. 15 and FIG. 18, in some embodiments, the second diversion structure 220 comprises a cone-shaped diversion wheel, and spirally extending diversion vanes 221 are arranged around the diversion wheel. The diversion wheel can be fixedly mounted on the cover 210 or rotatably mounted on the cover 210. The diversion wheel and the cover 210 can be molded separately in the production process.

In some other embodiments, the second diversion structure 220 can also comprise a plurality of diversion vanes 221 arranged in a vortex shape, and the diversion vanes 221 are arranged on side face of the cover 210 facing the drain hole 111 in a protruding manner. The diversion vanes 221 and the cover 210 can be integrally formed in the production process.

During specific implementation, the above-mentioned drain valve can be configured as a cylinder drain valve 01 or a float drain valve 02.

During specific implementation, referring to FIG. 15, the cover 210 of the cylinder drain valve 01 can be provided with the second diversion structure 220 above. In another implementation, referring to FIG. 18, the cover 210 of the float drain valve 02 can also be provided with the second diversion structure 220 above.

Referring to FIG. 12 to FIG. 15, in the cylinder drain valve 01, the switch mechanism 200 comprises an outer cylinder 230, an operating portion 240 and a transmission assembly 250. The outer cylinder 230 is located at one side of the body 110 and is fixedly connected with the body 110. A water inlet 122 fluidly communicating with the drain hole 111 is arranged between the outer cylinder 230 and the body 110, and the cover 210 is slidably mounted in one end of the outer cylinder 230 near the body 110. The operating portion 240 is mounted at one end of the outer cylinder 230 far away from the body 110, and the transmission assembly 250 is mounted in the outer cylinder 230. The operating portion 240 is in transmission connection with the transmission assembly 250, and the transmission assembly 250 is in transmission connection with the cover 210. When the operating portion 240 moves, the operating portion 240 drives the cover 210 to slide close to or away from the drain hole 111 through the transmission assembly 250 to close or open the drain hole 111. When the cover 210 is far away from the drain hole 111 to open the drain hole 111, the water inlet 122 is communicated fluidly with the drain hole 111, so that water outside the drain valve can first pass through the water inlet 122 and then enter the drain hole 111.

In the cylinder drain valve 01, the operating portion 240 can be configured in the form of a button or a knob. Specifically, when the operating portion 240 is configured in the form of a button, the operating portion 240 can be slidably mounted on the outer cylinder 230. In this case, one, two or more operating portions 240 can be provided. When the operating portion 240 is configured in the form of a knob, the operating portion 240 is rotatably mounted on the outer cylinder 230.

Referring to FIG. 7, FIG. 12 and FIG. 15, in the cylinder drain valve 01, a connecting portion 120 is arranged between the body 110 and the outer cylinder 230. One of the body 110 and the outer cylinder 230 is integrally connected with the connecting portion 120, and the other of the body 110 and the outer cylinder 230 is detachably connected with the connecting portion 120. The water inlet 122 is defined at an outer periphery of the connecting portion 120, and the connecting portion 120 defines an avoidance hole 121 along the axis of the drain hole 111. The water inlet 122 is communicated fluidly with the avoidance hole 121, the avoidance hole 121 is opposite to and communicated fluidly with the drain hole 111, and the cover 210 is located in the avoidance hole 121.

Referring to FIG. 7, FIG. 12 and FIG. 14, in the cylinder drain valve 01, when the body 110 is integrally connected with the connecting portion 120, one end of the outer cylinder 230 is rotatably inserted and connected with the connecting portion 120. One of the connecting portion 120 and the outer cylinder 230 defines a plurality of clamping grooves 123, and the other of the connecting portion 120 and the outer cylinder 230 is provided with a clamping portion 231. The plurality of clamping grooves 123 are circumferentially distributed around the axis of the drain hole 111. The connecting portion 120 is elastic, and the clamping portion 231 can be clamped in any one of the clamping grooves 123, so that a mounting angle of the whole switching mechanism 200 relative to the flowrate-increasing drain head can be adjusted by rotating the outer cylinder 230. In the process of rotating the outer cylinder 230, due to the elasticity of the connecting portion 120, the clamping portion 231 can be moved from one of the clamping grooves 123 to the other clamping grooves 123, and a sound can be made during the movement of the clamping portion 231 to remind the rotation of the outer cylinder 230.

Referring to FIG. 16 to FIG. 18, in the float drain valve 02, the switch mechanism 200 comprises a rotating arm 260, the rotating arm 260 is connected to the cover 210 at an end, and is rotatably connected to the body 110 at the other end. A density of the cover 210 is less than that of water, or the cover 210 is provided with a buoyancy portion 211 with a density less than that of water. Therefore, in such a case where the float drain valve 02 is applied to sanitary ware, when the buoyancy portion 211 on the cover 210 is submerged in the water, the buoyancy portion 211 gets buoyancy, and then the cover 210 is driven by the buoyancy to rotate away from the drain hole 111 to open the drain hole 111, so as to drain the water around the cover 210. During the drain process, the cover 210 will rotate to approach the drain hole 111 under the action of gravity, so that after the water around the cover 210 is drained, the cover 210 closes the drain hole 111 again.

It should be noted that the switch structure of the above-mentioned drain valve can also be arranged in other ways. In an example, the switch structure further comprises a housing, a pressing piece and a magnet. The housing is connected with the body 110, and an avoidance hole 121 communicating fluidly with the drain hole 111 is defined between the housing and the body 110. The cover 210 is mounted in the housing and can slide along the axis of the drain hole 111, and the pressing piece is mounted in the housing and can slide along the axis of the drain hole 111. The magnet is slidably mounted in the housing and connected with the pressing piece. The cover 210 is magnetic or the cover 210 is provided with a magnetic portion to generate suction between the cover 210 and the magnet. A reset piece is arranged between the pressing piece and the housing, so that when a user presses the pressing piece, the pressing piece slides towards the body 110, and the magnet approaches the cover 210, so that the suction between the magnet and the cover 210 increases and the cover 210 slides away from the drain hole 111. Thus, the drain hole 111 is opened. After the user releases the pressing piece, the pressing piece moves and resets under the action of the resetting piece, so that the magnet is far away from the cover 210, and attraction between the magnet and the cover 210 is reduced, so that the cover 210 slides close to the drain hole 111 under the gravity of the cover to close the drain hole 111 again. In other implementations, the cover 210 can also slide close to the drain hole 111 under the action of a spring or other resetting structure to close the drain hole 111 again.

The technical features of the above embodiments can be combined in any way. In order to simplify the description, not all the possible combinations of the technical features of the above embodiments are described. However, as long as there is no contradiction in the combinations of these technical features, they should be considered as falling within the scope recorded in this specification.

The embodiments of the present disclosure are described in detail with reference to the drawings above, but the present disclosure is not limited to the above embodiments, and various changes may also be made within the knowledge scope of those of ordinary skills in the art without departing from the purpose of the present disclosure.