DUAL-CHANNEL LIQUID EXTRACTION DEVICE, LIQUID EXTRACTION SYSTEM, AND LIQUID EXTRACTION METHOD

Description

CROSS REFERENCE OF RELATED APPLICATION

This application is a continuation of International Patent Application No. PCT/CN2024/075453, filed Feb. 2, 2024, which claims priority of Chinese patent application No. 2023108659482, filed on Jul. 14, 2023, entitled “A Dual-Channel Liquid Extraction Device, Liquid Extraction System, and Liquid Extraction Method”, the entirety of which is incorporated by reference.

TECHNICAL FIELD

The present application belongs to the technical field of gas-charged liquid extraction, and in particular relates to a dual-channel liquid extraction device, a liquid extraction system, and a liquid extraction method.

BACKGROUND

Currently, the gas-charged liquid extraction technical solutions in the prior art can realize the operation of displacing the liquid in a bottle by injecting gas. Such liquid extraction devices generally include single-channel liquid extraction devices and dual-channel liquid extraction devices. The single-channel liquid extraction device shares a common channel for liquid extraction and gas charging, requiring gas to be injected first before performing liquid extraction. Additionally, it has relatively high requirements for intake pressure, which may pose risks of gas waste or bottle explosion. In the dual-channel liquid extraction device, the liquid extraction and gas charging channels are separated, but the existing dual-channel liquid extraction devices have a relatively complex assembly and require manual switching and adjustment of the internal channel connection in advance during use, which affects the user experience to a certain extent.

SUMMARY

In order to address the aforementioned problems existing in the current technology, this application proposes a dual-channel liquid extraction device, a liquid extraction system and a liquid extraction method, aiming to solve the aforementioned technical defects.

According to the first aspect of the present application, a dual-channel liquid extraction device is proposed, comprising a liquid extraction body, a switch valve core, a sealing sleeve, and a flow-guiding part, the sealing sleeve is sleeved on a lower part of the liquid extraction body and is used to fit with an opening of a bottle to be extracted in a sealing way, an open cavity is provided on an upper part of the liquid extraction body, a liquid outlet is provided on one side of the liquid extraction body, a first cavity for accommodating the switch valve core is provided through the interior of the liquid extraction body, and the liquid outlet is communicated with a middle part of the first cavity;

• • the flow-guiding part is connected with the lower part of the liquid extraction body and inserted into the sealing sleeve, axial flow-guiding fins are provided in an array at intervals on a circumferential surface of the flow-guiding part to form a plurality of flow-guiding areas between the sealing sleeve and the circumferential surface of the flow-guiding part, a second cavity is provided inside the flow-guiding part, a connecting hole for communicating the flow-guiding areas with the second cavity is provided on an upper part of the flow-guiding part, and a check valve is provided in a middle part of the second cavity in a sealing way;
  • a lower part of the switch valve core passes through the first cavity and fits with the check valve inside the flow-guiding part, a gas inlet channel is provided inside the switch valve core, a gas outlet hole communicating with the gas inlet channel radially penetrates through the lower part of the switch valve core, a first sealing structure and a liquid outlet channel are provided on a circumferential surface of a middle part of the switch valve core, a top of the switch valve core is provided in the open cavity with an elastic reset structure, such that the liquid outlet channel is blocked by the first sealing structure and the gas outlet hole is closed by the check valve, and when the switch valve core is pressed to generate an axial displacement, the liquid outlet channel is communicated with the liquid outlet and the gas outlet hole is communicated with a lower part of the second cavity. This dual-channel liquid extraction device can simultaneously inflate and open the liquid outlet channel by pressing the switch valve core with an external gas charging structure. One operation can achieve the synchronous actions of inflation and liquid extraction.

In some specific embodiments, a gas charging hole is provided at a center of the top of the switch valve core, the gas charging hole is communicated with the gas inlet channel, and the elastic reset structure comprises a spring provided between the top of the switch valve core and a bottom of the open cavity. With this arrangement, it enables the reset sealing of the valve core after its inflation is completed.

In some specific embodiments, the liquid outlet channel comprises a first area between a recess provided on the circumferential surface of the middle part of the switch valve core and the middle part of the first cavity, and a second area between axial protrusions provided at intervals on the circumferential surface of the lower part of the switch valve core and an upper part of the second cavity, the first area is communicated with the liquid outlet, the first sealing structure blocks the communication between the first area and the second area, and when the switch valve core is pressed to generate the axial displacement, the first area and the second area are communicated. With this arrangement, the liquid outlet channel can be communicated when the switch valve core is pressed to displace.

In some specific embodiments, a second sealing structure is provided between a surface of the switch valve core above the first area and the first cavity. With this arrangement, it can prevent liquid from leaking between the upper part of the switch valve core and the first cavity during liquid extraction.

In some specific embodiments, the axial flow-guiding fins are provided with a toothed structure. With this arrangement, it can prevent the sealing sleeve from sliding and shifting during use.

In some specific embodiments, the check valve is hollow and provided with an upper cavity and a lower cavity, the upper cavity fits with the lower part of the switch valve core in a sealing way through a sliding movement of the lower part of the switch valve core, and the lower cavity has an inner diameter larger than that of the upper cavity. With the arrangement of this sliding-type drive check valve, the gas outlet hole can be exposed for gas outlet when the switch valve core is pressed down, and closed when the switch valve core rebounds, with reliable sealing and no pressure loss.

In some specific embodiments, the device further comprises a flow-restricting insert, the flow-restricting insert fits with an end of the flow-guiding part in a sealing way, and a flow-restricting hole passes through and is provided inside the flow-restricting insert. With the arrangement of the flow-restricting insert, it can prevent the backflow of wine into the flow-guiding part when the bottle is stationary.

In some specific embodiments, the device further comprises a filter assembly, the filter assembly comprises an annular filter screen and a hollow tube, one end of the annular filter screen fits with a bottom of the sealing sleeve in a sealing way, and the other end thereof is fixed to a head of the hollow tube when an end of the hollow tube is connected with an end of the flow-guiding part in a sealing way. With the arrangement of the filter assembly, it can filter impurities during the liquid extraction process, and improve the quality of the discharged liquid.

According to the second aspect of the present application, a liquid extraction system is proposed, the system comprises the dual-channel liquid extraction device as mentioned above, and further comprises a gas charging assembly and a gas source, the gas charging assembly is connected with the gas source, and the gas charging assembly presses the switch valve core to perform gas charging and liquid extraction. This liquid extraction system can be connected to the gas source through the gas charging assembly and achieve synchronous operation of gas charging and liquid extraction in conjunction with the dual-channel liquid extraction device.

In some specific embodiments, the gas charging assembly comprises a gas charging terminal fixed on a vertical surface, and a gas charging part used to press to fits with the gas charging hole of the switch valve core is obliquely provided on the gas charging terminal. With this arrangement, it can realize the operation of holding the bottle with one hand to press for gas charging and liquid extraction.

According to the third aspect of the present application, a gas-charged liquid extraction method is proposed, the method uses the dual-channel liquid extraction device as mentioned and comprises the following steps of:

• • S1: inserting the dual-channel liquid extraction device into the bottle to be extracted, tilting the bottle to be extracted, and using an external gas charging assembly to fit with the switch valve core to press the switch valve core to open the gas inlet channel and the liquid outlet channel, so as to perform a synchronous operation of gas charging and liquid extraction;
  • S2: removing the external gas charging assembly and placing the bottle upright after the liquid extraction is performed, pressing the switch valve core to discharge an excess compressed gas in the bottle to be extracted, and blowing out a residual liquid in the liquid outlet at the same time.

In some specific embodiments, the method further comprises a subpackage step: connecting an adapter provided at the liquid outlet with a subpackage bag, using the S1 to fill the subpackage bag, pressing the switch valve core to inject some other compressed gas into the subpackage bag after the filling is completed, and removing a connection between the adapter and the subpackage bag. With this operation, it can realize a better effect of storing the liquid in the bag, and obtain the effects of increasing external force resistance and bag shaping.

Compared with the prior art, the beneficial effects of the present application are as follows:

The dual-channel liquid extraction device in the present application can realize the simultaneous opening of the gas inlet channel and liquid outlet channel when pressed down by the gas charging assembly through the resettable switch valve core, thereby achieving the synchronous operation of gas charging and liquid extraction. The sliding-type drive check valve can expose the gas outlet hole when the switch valve core is pressed down, and close the gas outlet hole when the switch valve is reset and rebounded, with reliable sealing and no pressure loss. The toothed flow-guiding part structure can form flow guiding areas between the flow-guiding part and the sealing sleeve, facilitating the introduction of the liquid to be extracted into the cavity, and the toothed axial flow-guiding fins can also prevent the sealing sleeve from sliding and shifting during use. It can select the flow-restricting insert or the filter assembly to connect with the flow-guiding part according to different application scenarios to meet the corresponding use requirements. The dual-channel liquid extraction device can be adapted to different forms of gas charging terminals (such as fixed or hand-held gas charging terminals), or the gas charging structure can be integrated on the liquid extraction body to meet the needs of different use scenarios. In addition, after the gas charging and liquid extraction operation is completed, part of the compressed gas in the bottle can be discharged by pressing the switch valve core, and the residual liquid in the liquid outlet can also be discharged thereby, preventing residual liquid in the channel. For the subpackage application, it can perform filling by connecting the subpackage adapter with the subpackage bag, and enable the excess gas in the bottle to enter the subpackage bag by pressing the switch valve core, which is convenient for properly squeezing out the excess gas when sealing the subpackage bag, and making the internal environment of the seal more stable and suitable for storage.

BRIEF DESCRIPTION OF THE DRAWINGS

Comprising accompanying drawings to provide a further understanding of the embodiments and the drawings are incorporated into this specification and form part of this specification. The drawings illustrate the embodiments and are used in conjunction with the description to explain the principles of the present disclosure. Many expected advantages of other embodiments and embodiments will be easily understood because they are better understood by referring to the following detailed description. The components in the drawings are not necessarily proportional to each other. The same pictorial markings refer to corresponding similar parts.

FIG. 1 is a schematic structural diagram of a dual-channel liquid extraction device according to a first embodiment of the present application;

FIGS. 2a-2b are cross-sectional views of a dual-channel liquid extraction device according to the first specific embodiment of the present application;

FIG. 3 is a schematic structural diagram of a dual-channel liquid extraction device according to a second embodiment of the present application;

FIGS. 4a-4b are cross-sectional views of a dual-channel liquid extraction device according to the second specific embodiment of the present application;

FIG. 5 is a schematic structural diagram of a liquid extraction system according to an embodiment of the present application;

FIG. 6 is a cross-sectional schematic diagram of a liquid extraction system according to a specific embodiment of the present application;

FIG. 7 is a flowchart of a liquid extraction method according to an embodiment of the present application;

FIG. 8 is a schematic diagram of subpackage according to a specific embodiment of the present application;

EXPLANATION OF REFERENCE NUMERALS IN THE FIGURES

• • 1—Liquid extraction body, 11—Liquid outlet, 12—open cavity, 13—first cavity, 14—liquid outlet channel, 2—Switch valve core, 21—Gas inlet, 22—Spring, 23—First sealing structure, 24—Second sealing structure, 25—gas outlet hole, 26—gas inlet channel, 3—Sealing sleeve, 4—Flow-guiding part, 41—Check valve, 42—axial flow-guiding fin, 43—second cavity, 44—connecting hole, 5—Flow-restricting insert, 6—Filter assembly, 61/61′—Annular filter screen, 62/62′—Hollow tube, 63/63′—Positioning edge, 7—Bottle to be extracted, 8—Gas charging terminal, 9—Subpackage adapter, 10—Subpackage bag.

DETAILED DESCRIPTION OF THE DISCLOSURE

The following detailed description refers to the attached figures, which form a part hereof and are shown by way of illustration specific embodiments in which the present application may be practiced. In this regard, directional terms such as “top”, “bottom”, “left”, “right”, “upper”, “lower” and the like are used with reference to the orientation of the described figures. Since the components of the embodiments can be positioned in a number of different orientations, the directional terms are used for illustrative purposes and are by no means limiting. It should be understood that other embodiments may be utilized or logical changes may be made without departing from the scope of the present application. Therefore, the following detailed description should not be taken in a limiting sense, and the scope of the present application is defined by the appended claims.

The application proposes a dual-channel liquid extraction device. FIG. 1 shows the schematic structural diagram of a dual-channel liquid extraction device in the first embodiment of the present application. As shown in FIG. 1, the liquid extraction device comprises a liquid extraction body 1, a switch valve core 2, a sealing sleeve 3, a flow-guiding part 4, and a flow-restricting insert 5. An open cavity 12 is provided on an upper part of the liquid extraction body 1, a liquid outlet 11 is provided on one side of the liquid extraction body 1, and a first cavity 13 for accommodating the switch valve core 2 is provided through the interior of the liquid extraction body 1. The switch valve core 2 is axially movably provided in the first cavity 13 inside the liquid extraction body 1 through a reset structure, a gas inlet 21 for fitting with an external gas charging assembly is provided on the upper part of the switch valve core 2. In one preferred embodiment, the gas inlet 21 is provided as a self-sealing structure, so that the gas inlet 21 can be closed immediately after each operation of gas charging and liquid extraction, thereby retaining the inert gas in the internal channel of the switch valve core 2 and avoiding the risk of gas mixing during subsequent operation of gas charging and liquid extraction. A gas inlet channel 26 is provided inside the switch valve core 2, the switch valve core 2 is configured such that when pressed to move axially, the liquid outlet channel 14 formed by the inside of the switch valve core 2 and the first cavity 13 is conducted and the gas inlet channel 26 is also in a conducted state. The sealing sleeve 3 is sleeved on the lower part of the liquid extraction body 1, and annular sealing protrusions are provided at intervals on the sealing sleeve 3 for inserting into and fitting with the opening of the bottle to be extracted 7 in a sealing way. The flow-guiding part 4 is inserted into the sealing sleeve 3 and connected to the lower part of the liquid extraction body 1. Axial flow-guiding fins 42 are provided at intervals on the circumferential surface of the flow-guiding part 4, so that it can form a plurality of flow-guiding areas between the sealing sleeve 3 and the circumferential surface of the flow guiding part when the flow-guiding part 4 fits with the sealing sleeve 3. The flow-restricting insert 5 is connected to the end of the flow-guiding part 4 for preventing the liquid in the bottle from flowing back into the flow-guiding part 4 when the bottle to be extracted 7 is stationary. The dual-channel liquid extraction device can realize the synchronous operation of gas charging and liquid extraction through the cooperation of an external gas charging assembly which is pressed to inflate gas. The structural principle of the dual-channel liquid extraction device will be described in detail below with reference to the cross-sectional views of the dual-channel liquid extraction device in FIGS. 2a-2b.

In a specific embodiment, as shown in the FIG. 2a, the first cavity 13 of the liquid extraction body 1 is communicated with the open cavity 12. The upper part of the first cavity 13 has a smaller inner diameter than that of the lower part, and the upper and lower parts are connected through a conical surface transition. The liquid outlet 11 penetrates through the upper cavity of the first cavity 13. The top of the switch valve core 2 is provided with an upper cover structure fitting with the open cavity 12. The reset structure comprises a spring 22 provided between the upper cover structure and the bottom of the open cavity 12. The middle part of the switch valve core 2 fits with the upper part of the first cavity 13. An annular recessed structure is provided in the middle part of the switch valve core 2, and a first sealing structure 23 and a second sealing structure 24 are respectively provided at the upper and lower ends of the annular recessed structure. Under the action of the spring 22, the switch valve core 2 is pressed upward so that the second sealing structure 24 is connected with the conical surface of the upper and lower parts of the first cavity 13 in a sealing way to block the communication between the lower part of the first cavity 13, the annular recessed structure, and the liquid outlet 11 (i.e., the liquid outlet channel 14 is blocked). When the switch valve core 2 is pressed down, the lower part of the first cavity 13, the annular recessed structure, and the liquid outlet 11 are communicated (i.e., the liquid outlet channel 14 is communicated).

In a specific embodiment, the middle part of upper cover structure of the switch valve core 2 is provided with gas inlet 21. The gas inlet 21 is connected to the gas inlet channel 26 inside the switch valve core 2. The external gas charging structure can fit with the gas inlet 21 to achieve the operation of gas charging. The gas inlet 21 is provided with a sealing assembly to ensure the sealing during the process of gas charging. The bottom of the gas inlet channel 26 inside the switch valve core 2 is provided with a gas outlet hole 25. The bottom of the gas inlet channel 26 radially penetrates through the lower part of the switch valve core 2 and provides a radial gas outlet hole 25 communicating with the gas inlet channel 26.

In a specific embodiment, a second cavity 43 is provided inside the flow-guiding part 4, the flow-guiding part 4 is connected to the lower part of the liquid extraction body 1 in a sealing way. The upper part of the flow-guiding part 4 is provided with a connecting hole 44 for communicating with the second cavity 43 in the interval areas of the axial flow-guiding fins 42, so as to introduce the liquid from the external flow-guiding area into the second cavity 43 and to carry out the operation of liquid extraction through the liquid outlet channel 14 mentioned above. A check valve 41 is provided in the second cavity 43 under the connecting hole 44 in a sealing way, hollow and provided with an upper cavity which fits with a lower part of the switch valve core 2 in a sealing way through a sliding movement of the lower part of the switch valve core 2, and provided with a lower cavity which has an inner diameter larger than that of the upper cavity. With this arrangement, when the switch valve core 2 is in the normal reset state (i.e., a state that the liquid outlet channel 14 is blocked above-mentioned), the lower part of the switch valve core 2 fits with the upper cavity of the check valve 41 in a sealing way, the radial gas outlet hole 25 is closed by the check valve 41, and the gas inlet channel 26 is blocked. When the switch valve core 2 is pressed down (i.e., when the liquid outlet channel 14 is open), the lower part of the switch valve core 2 extends from the upper cavity of the check valve 41 to the lower cavity. At this time, the radial gas outlet hole 25 is open to the lower cavity of the check valve 41, and the gas inlet channel 26 is open, allowing for the operation of gas charging.

In a specific embodiment, axial flow-guiding fins 42 provided at intervals on a circumferential surface of the flow-guiding part 4 are provided with a toothed structure, which are used to insert into the sealing sleeve 3 to prevent the sealing sleeve 3 sliding and shifting when the sealing sleeve 3 fits with the opening of the bottle to be extracted 7, and is used to enhance the grip on the surface of the components for making assembly and disassembly more convenient, and facilitating the daily cleaning and replacement of each component. The end of the flow-guiding part 4 is connected to the flow-restricting insert 5 through a threaded structure in a sealing way, and a flow-restricting hole is penetratingly arranged in the middle of the flow-restricting insert 5. It can prevent the liquid in the bottle from flowing back into the cavity of the flow-guiding part 4 when it is stationary, avoiding increasing the difficulty of cleaning the stopper. A certain length of flow-restricting hole is provided at the end, and it is difficult for external liquid to enter the inner cavity under the effect of water tension and the gas pressure in the internal sealed space. Another function of the flow-restricting insert 5 is to act as a threaded plug, providing protection for the connecting threads when changing the filter element.

In another embodiment, as shown in FIG. 2b, the flow-restricting insert 5 is integrated with the flow-guiding part 4. That is to provide the structure of flow-restricting hole at the end of the flow-guiding part 4, making the overall integration more efficient. Similarly, it can achieve the effect of preventing the liquid in the bottle from flowing back into the cavity of the flow-guiding part 4 when it is stationary as described in this application.

FIG. 3 shows a schematic structural diagram of a dual-channel liquid extraction device according to a second embodiment of the present invention. As shown in FIG. 3, for fermented wine in bottles, natural wine with a lot of sediment in bottles, or aged wine in bottles, as well as situations where the bottle is opened and the stopper is broken, resulting in wood chips present in the liquid inside the bottle, an additional filter screen assembly 6 can be added, which can replace the aforementioned flow-restricting insert 5, connect to and fit with the end of the flow-guiding part 4 through a threaded connection. FIGS. 4a-4b show cross-sectional views of a dual-channel liquid extraction device according to the second specific embodiment of the present invention. In one embodiment, as shown in FIG. 4a, the filter screen assembly 6 comprises an annular filter screen 61 and a hollow tube 62. The annular filter screen 61 comprises a porous tubular structure. The bottom of the sealing sleeve 3 has a sealing protrusion. One end of the annular filter screen 61 fits with the sealing protrusion and provided on the sealing sleeve 3. One end of the hollow tube 62 has an end closure structure, and the other end thereof is connected to the flow-guiding part 4 through the connection of threads. Radial positioning edges 63 are arranged at intervals on the surface of the hollow tube 62. The radial positioning edges 63 and the inside of the annular filter screen 61 realize the sealing fit of the inclined surface of the top of the hollow tube 62 by tightening the matching threads. At the same time, one end of the end-cover structure clamps the other end of the annular filter screen 61 to realize the operations of gas-guiding and filtering liquid outlet 11. In another embodiment, as shown in FIG. 4b, the flow-guiding part 4 can be directly replaced with a filter tube. In this embodiment, the filter assembly 6 comprises an annular filter screen 61′ and a hollow tube 62′. One end of the annular filter screen 61′ fits with the sealing sleeve 3 in a sealing way. One end of the hollow tube 62 has an end surface with an outer diameter larger than that of the annular filter screen 61, and the other end thereof is connected to the lower part of the liquid extraction body 1 through the connection of threads. Radial positioning edges 63′ are arranged at intervals on the surface of the hollow tube 62′. The radial positioning edges 63′ fit with the inside of the annular filter screen 61′ and have a flow-guiding function. The sealing fit of the top inclined surface is realized by tightening the matching threads. A knob part is provided at the end section of the hollow tube 62′ and comprises a convex structure, which is convenient for the user to manually screw to install or disassemble the filter assembly 6.

Continuing to refer to FIG. 5, FIG. 5 shows a schematic structural diagram of a liquid extraction system according to an embodiment of the present application. As shown in FIG. 5, the liquid extraction system comprises the dual-channel liquid extraction device as mentioned above, which is inserted into the bottle to be extracted 7. It further comprises a gas charging terminal 8 provided with a gas charging part. When the gas charging terminal 8 is fixed on a vertical surface such as a wall, the gas charging part is provided obliquely upward. The gas charging part provides a press-type gas outlet valve and an overpressure protection valve structure, and is connected to an external large-capacity gas cylinder through a gas pipe seat. And the gas charging part is also provided with a guiding sleeve, which is used to guide the insertion of the dual-channel liquid device and has a notch that fits with the positioning of the liquid outlet 11. By pressing the gas outlet valve to achieve a pressing fit with the switch valve core 2 of the dual-channel liquid extraction device, both the intake channel and the liquid extraction channel can be opened simultaneously, enabling the synchronous operations of gas charging and liquid extraction can be realized. The specific state refers to the cross-sectional schematic diagram of the liquid extraction system according to a specific embodiment of the present application shown in FIG. 6. As shown in FIG. 6, when the bottle to be extracted 7 inserted with the dual-channel liquid extraction device fits with a gas charging head of the gas charging terminal 8, the bottle body is pressed to make the valve core of the gas outlet valve fit with the gas inlet 21 of the switch valve core 2, and the switch valve core 2 is pressed down upward, so that the lower part of the first cavity 13 of the liquid extraction body 1, the annular recessed structure on the switch valve core 2, and the liquid outlet 11 are communicated (i.e., the liquid outlet channel 14 is communicated). At the same time, the lower part of the switch valve core 2 extends out of the upper cavity of the check valve 41 into the lower cavity, the radial gas outlet hole 25 is communicated with the lower cavity of the check valve 41, the gas inlet channel 26 is communicated, and the operation of gas charging can be performed. External compressed gas enters the bottle through the gas inlet channel 26, and at the same time the liquid inside the bottle is forced to be expelled through the liquid outlet channel 14, completing the simultaneous operations of gas charging and liquid extraction. In this embodiment, the dual-channel liquid extraction device with the flow-restricting insert 5 in FIGS. 1-2 is taken as an example. In application scenarios requiring filtration, the dual-channel liquid extraction device with the filter assembly 6 as shown in FIGS. 3-4 can also be used for gas charging and liquid extraction operations, which can also realize the simultaneous gas charging and liquid extraction operations through pressing operations.

Continuing to refer to FIG. 7, FIG. 7 shows a flowchart of a liquid extraction method according to an embodiment of the present application, the method uses the dual-channel liquid extraction device as mentioned and specifically comprises the following steps of:

• • S1: inserting the dual-channel liquid extraction device into the bottle to be extracted, tilting the bottle to be extracted, and using an external gas charging assembly to fit with the switch valve core to press the switch valve core to open the gas inlet channel 26 and the liquid outlet channel, so as to perform a synchronous operation of gas charging and liquid extraction;
  • S2: removing the external gas charging assembly and placing the bottle upright after the liquid extraction is performed, pressing the switch valve core to discharge an excess compressed gas in the bottle to be extracted, and blowing out a residual liquid in the liquid outlet at the same time.

In some specific embodiments, the method further comprises a subpackage step: connecting an adapter provided at the liquid outlet 11 with a subpackage bag 10, using the S1 to fill the subpackage bag 10, pressing the switch valve core 2 to inject some other compressed gas into the subpackage bag 10 after the filling is completed, and removing a connection between the adapter and the subpackage bag 10. When packaging the subpackage bag 10, some excess gas can be squeezed out as needed. This not only enhances external force resistance of the subpackage bag 10, but also has a shaping effect. FIG. 8 shows a schematic diagram of subpackage according to one specific embodiment of the present application. As shown in FIG. 8, the liquid outlet 11 of the dual-channel liquid extraction device is provided with a subpackage adapter 9, which fits with the surface of the liquid outlet 11 in a sealing way. Specifically, a sealing gasket is provided inside the subpackage adapter 9 to seal the opening of the subpackage bag 10, and the subpackage adapter 9 can fit with a filling port of the subpackage bag 10. During the injecting application, it can finish the operations of gas charging and liquid extraction through the above liquid extraction method by simply connecting the subpackage bag 10 to the subpackage adapter 9, and it can realize the purpose of injecting some other compressed gas into the subpackage bag 10 after the liquid extraction is completed by making use of the switch valve core 2 of the dual-channel liquid extraction device, thereby facilitating the extraction of excess gas as needed when packaging the subpackage bag 10 to ensure the stability of the internal environment during packaging. The compressed gas in the above embodiment comprises inert gases that do not react with the liquid in the bottle, such as argon, carbon dioxide, nitrogen, or their mixtures.

The dual-channel liquid extraction device in the present application can realize the simultaneous opening of the gas inlet channel 26 and liquid outlet channel 14 when pressed down by the gas charging assembly through the resettable switch valve core 2 and its cooperative arrangement with the internal structure of the liquid extraction body 1, thereby achieving the synchronous operations of gas charging and liquid extraction. Moreover, a flow-restricting insert 5 or a filter assembly 6 can be selected to connect with the flow-guiding part 4 according to different application scenarios to meet the corresponding usage requirements. The dual-channel liquid extraction device can be adapted to different forms of gas charging terminals 8 (such as the aforementioned fixed gas charging terminal, hand-held gas charging terminal, wall-mounted gas charging terminal, desktop gas charging terminal, etc.), or the gas charging structure can be integrated on the liquid extraction body 1 to meet the needs of different usage scenarios. In addition, after the operations of gas charging and liquid extraction are completed, part of the compressed gas in the bottle can be discharged by pressing the switch valve core 2, and the residual liquid remaining in the liquid outlet 11 can also be discharged thereby to prevent residual liquid from accumulating in the channel. In the subpackage application, it can perform filling by connecting the subpackage adapter 9 with the subpackage bag 10, and it can press the switch valve core to make the excess gas in the bottle enter the subpackage bag 10, which facilitates properly squeezing out the excess gas when sealing the subpackage bag 10, and making the internal environment of the seal more stable and suitable for storage.

Obviously, those skilled in the field can make various modifications and changes to the embodiments of the present invention without departing from the spirit and scope of the invention. In this way, if these modifications and changes fall within the scope of the claims of the invention and its equivalents, the invention is also intended to cover these modifications and changes. The word “including” does not exclude the presence of other elements or steps not listed in the claims. The fact that certain measures are recorded in separate dependent claims does not indicate that the combination of these measures cannot be used for profit. Any reference numerals in the claims should not be construed as limiting the scope.