Liquid pumping switching device

Abstract

This utility model discloses a liquid extraction switching device, comprising: a pump capable of reversible operation, the pump having a first interface and a second interface; a first container and the first interface connected by a first pipeline; a second container and the second interface connected by a second pipeline; a third pipeline connected to the first interface; and a fourth pipeline connected to the second interface; thereby realizing the function of alternating extraction of the first container and the second container through a single pump, effectively reducing structural costs and being convenient to use.

Description

Technical Field

[0001] This utility model relates to the field of bathroom equipment technology, and in particular to a liquid pumping and switching device. Background Technology

[0002] With the improvement of living standards and the increasing use of smart technology, automatic foaming machines have emerged in the market. Current foaming technologies typically use two pumps, each supplying a different type of soap, when switching between two different soap solutions, such as shower gel and shampoo. This results in high overall structural costs and a large footprint. Utility Model Content

[0003] The present invention aims to at least partially solve one of the aforementioned technical problems in the related art. To this end, the present invention proposes a liquid extraction switching device.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] The liquid extraction switching device according to a first aspect embodiment of the present invention includes:

[0006] A pump capable of reversible operation, the pump having a first interface and a second interface;

[0007] A first container, the first container and the first interface are connected by a first pipeline;

[0008] A second container is connected to the second interface via a second conduit;

[0009] The third pipeline is connected to the first interface;

[0010] The fourth conduit is connected to the second interface; wherein,

[0011] When the pump is running in the forward direction, the liquid in the first container is drawn out and flows sequentially along the first pipeline, the first interface and the second interface, and is discharged outward from the fourth pipeline. At the same time, the third pipeline is restricted from conveying liquid towards the first interface, and the second pipeline is restricted from conveying liquid towards the second container.

[0012] When the pump is running in reverse, the liquid in the second container is drawn out and flows sequentially along the second pipeline, the second interface and the first interface, and is discharged outward from the third pipeline. At the same time, the fourth pipeline is restricted from delivering liquid to the second interface, and the first pipeline is restricted from delivering liquid to the first container.

[0013] The liquid extraction switching device according to the embodiments of the present invention has at least the following beneficial effects: it realizes the function of alternating extraction of the first container and the second container by a single pump, effectively reducing structural costs and making it convenient to use.

[0014] According to some embodiments of the present invention, a first control valve is installed on the first pipeline, and when the pump is running in reverse, the first control valve can shut off the connection between the first interface and the first container.

[0015] A second control valve is installed on the second pipeline. When the pump is running in the forward direction, the second control valve can shut off the connection between the second interface and the second container.

[0016] A third control valve is installed on the third pipeline, which can shut off the third pipeline when the pump is rotating in the forward direction.

[0017] A fourth control valve is installed on the fourth pipeline, which can shut off the fourth pipeline when the pump reverses.

[0018] According to some embodiments of the present invention, the first control valve is a first check valve, which controls the liquid in the first container to be unidirectionally transported to the first interface through the first pipeline, and the third pipeline is connected to the first pipeline and the connection point is located downstream of the first check valve.

[0019] According to some embodiments of the present invention, the third control valve is a third check valve, which controls the liquid flowing through the third pipeline to flow unidirectionally away from the first interface.

[0020] According to some embodiments of the present invention, the second control valve is a second check valve, which controls the liquid in the second container to be unidirectionally transported to the second interface through the second pipeline, and the fourth pipeline is connected to the second pipeline and the connection point is located downstream of the second check valve.

[0021] According to some embodiments of the present invention, the fourth control valve is a fourth check valve, which controls the liquid flowing through the fourth pipeline to flow unidirectionally away from the second interface.

[0022] According to some embodiments of the present invention, a foaming mechanism is also included, which is connected downstream of the third pipeline and the fourth pipeline.

[0023] According to some embodiments of the present invention, it further includes a liquid outlet pipeline, wherein the third pipeline and the fourth pipeline are connected in parallel to the liquid outlet pipeline, and the foaming mechanism is installed on the liquid outlet pipeline.

[0024] According to some embodiments of this utility model, it also includes a five-way valve module, which is provided with a first connector, a second connector, a third connector, a fourth connector, a fifth connector, a first cavity, a second cavity, a third cavity, and a fourth cavity.

[0025] The first connector is connected to the first container, the second connector is connected to the second container, the third connector is connected to the first interface, and the fourth connector is connected to the second interface.

[0026] The first cavity is located between the first connector and the third connector, and the first control valve is installed in the first cavity to control the unidirectional flow of liquid from the first connector through the first cavity to the third connector;

[0027] The second cavity is located between the second connector and the fourth connector, and the second control valve is installed in the second cavity to control the unidirectional flow of liquid from the second connector through the second cavity to the fourth connector;

[0028] The third cavity is located between the third connector and the fifth connector, and the third control valve is installed in the third cavity to control the unidirectional flow of liquid from the third connector through the third cavity to the fifth connector;

[0029] The fourth cavity is located between the fourth connector and the fifth connector, and the fourth control valve is installed in the fourth cavity to control the unidirectional flow of liquid from the fourth connector to the fifth connector through the fourth cavity.

[0030] According to some embodiments of the present invention, the first pipeline, the third pipeline and the first interface are connected by a first tee fitting, and the second pipeline, the fourth pipeline and the second interface are connected by a second tee fitting.

[0031] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0032] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0033] Figure 1 This is a schematic diagram of the liquid extraction switching device;

[0034] Figure 2 This is a schematic diagram of another embodiment of the liquid extraction switching device;

[0035] Figure 3This is a structural diagram of a five-way valve module;

[0036] Figure 4 yes Figure 3 A structural decomposition diagram;

[0037] Figure 5 This is a partial structural diagram of a five-way valve module.

[0038] Reference numerals: Pump 100; First interface 101; Second interface 102; First container 201; Second container 202; First pipeline 301; Second pipeline 302; Third pipeline 303; Fourth pipeline 304; Liquid outlet pipeline 305; First control valve 410; First check valve 411; Second control valve 420; Second check valve 421; Third control valve 430; Third check valve 431; Fourth control valve 440; Fourth check valve 441; Foaming mechanism 500; Five-way valve module 600; First connector 601; Second connector 602; Third connector 603; Fourth connector 604; Fifth connector 605; First cavity 606; Second cavity 607; Third cavity 608; Fourth cavity 609; First tee fitting 701; Second tee fitting 702. Detailed Implementation

[0039] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0040] This utility model relates to a liquid extraction switching device, including a pump 100, a first container 201, a second container 202, a first pipeline 301, a second pipeline 302, a third pipeline 303, and a fourth pipeline 304.

[0041] like Figure 1As shown, pump 100 has a first interface 101 and a second interface 102, which are used for pump 100 to draw in and discharge liquid. Pump 100 can be a peristaltic pump 100, etc. Pump 100 is configured to rotate in both forward and reverse directions. When pump 100 rotates forward, it draws in external liquid through the first interface 101 and then discharges it through the second interface 102. When pump 100 rotates in reverse, it draws in external liquid through the second interface 102 and then discharges it through the first interface 101. First container 201 and second container 202 are used to store different types of soap solutions, such as shower gel in first container 201 and shampoo in second container 202. First container 201 and first interface 101 are connected by a first pipe 301. Second container 202 and second interface 102 are connected by a second pipe 302. The third conduit 303 is connected to the first interface 101. This connection can be, but is not limited to, the third conduit 303 being directly connected to the first interface 101, or the third conduit 303 serving as a branch of the first conduit 301, connecting to the first interface 101 via the first conduit 301. Alternatively, the first interface 101, the first conduit 301, and the third conduit 303 can be connected via a first tee fitting 701. The fourth conduit 304 is connected to the second interface 102. This connection can be, but is not limited to, the fourth conduit 304 being directly connected to the second interface 102, or the fourth conduit 304 serving as a branch of the second conduit 302, connecting to the second interface 102 via the second conduit 302. Alternatively, the second interface 102, the second conduit 302, and the fourth conduit 304 can be connected via a second tee fitting 702. The first pipe 301, the second pipe 302, the third pipe 303, and the fourth pipe 304 can be flexible hoses, rigid pipes, or passages formed inside certain components. When the pump 100 rotates forward, a negative pressure is created at the first interface 101, drawing liquid (such as shower gel) from the first container 201. The shower gel flows sequentially along the first pipe 301 and the first interface 101 into the pump 100, then flows out from the second interface 102, and is discharged from the fourth pipe 304 for user use. At this time, the third pipe 303 is restricted from conveying liquid towards the first interface 101; that is, under the negative pressure of the first interface 101, the third pipe 303 is in a closed state, preventing external liquid from flowing back to the first interface 101 through the third pipe 303, and ensuring that when the first interface 101 is under negative pressure, only the liquid in the first container 201 is drawn through the first pipe 301.Simultaneously, the second pipe 302 is restricted from supplying liquid to the second container 202. That is, when the shower gel drawn from the first container 201 is output from the second port 102, the flow path from the second pipe 302 to the second container 202 is closed, allowing the shower gel to only be discharged from the fourth pipe 304, preventing the shower gel from flowing into the second container 202 through the second pipe 302. When the pump 100 reverses its operation, a negative pressure is formed at the second port 102 of the pump 100. Liquid (such as shampoo) in the second container 202 is drawn out by the pump 100, and the shampoo flows sequentially along the second pipe 302 and the second port 102 into the pump 100, then flows out from the first port 101, and is discharged from the third pipe 303 for user use. At this time, the fourth pipe 304 is restricted from supplying liquid to the second port 102. That is, under the negative pressure of the second interface 102, the fourth pipe 304 is in a closed state, preventing external liquid from flowing back to the second interface 102 through the fourth pipe 304, and ensuring that when the second interface 102 is under negative pressure, liquid is only drawn from the second container 202 through the second pipe 302. At the same time, the first pipe 301 is restricted from delivering liquid to the first container 201. That is, when the shampoo drawn from the second container 202 is output from the first interface 101, the flow path from the first pipe 301 to the first container 201 is closed, so that the shampoo can only be discharged from the third pipe 303, preventing the shampoo from flowing into the first container 201 through the first pipe 301. The function of alternating extraction from the first container 201 and the second container 202 is achieved by a single pump 100, effectively reducing structural costs and making it convenient to use.

[0042] In one embodiment, a first control valve 410 is installed on the first pipeline 301, controlling the opening and closing of the connection between the first interface 101 and the first container 201. A second control valve 420 is installed on the second pipeline 302, controlling the opening and closing of the connection between the second interface 102 and the second container 202. A third control valve 430 is installed on the third pipeline 303, controlling the opening and closing of the third pipeline 303. A fourth control valve 440 is installed on the fourth pipeline 304, controlling the opening and closing of the fourth pipeline 304. When the pump 100 is running in the forward direction, the first control valve 410 and the fourth control valve 440 are open, and the first pipeline 301 and the fourth pipeline 304 are in an open state; the second control valve 420 and the third control valve 430 are closed, and the second pipeline 302 and the third pipeline 303 are in a closed state. When pump 100 runs in reverse, the first control valve 410 and the fourth control valve 440 are closed, and the first pipeline 301 and the fourth pipeline 304 are in a closed state; the second control valve 420 and the third control valve 430 are open, and the second pipeline 302 and the third pipeline 303 are in a connected state. The first control valve 410, the second control valve 420, the third control valve 430, and the fourth control valve 440 can be selected from solenoid valves, check valves, etc.

[0043] In one embodiment, the first control valve 410 is a first check valve 411. The first check valve 411 controls the liquid in the first container 201 to be unidirectionally transported to the first port 101 through the first pipe 301. The third pipe 303 is connected to the first pipe 301, and the connection between the third pipe 303 and the first pipe 301 is located downstream of the first check valve 411. When the pump 100 is running in the forward direction, a negative pressure is formed in the first port 101, and the shower gel in the first container 201 flows along the first pipe 301 and through the first check valve 411 to be transported to the first port 101. At this time, the third control valve 430 is closed. When the pump 100 is running in the reverse direction, a negative pressure is formed in the second port 102, drawing out the shampoo in the second container 202. The shampoo is output from the first port 101, and at this time, the third control valve 430 is opened, and the shampoo is discharged from the third pipe 303. After the shampoo is output from the first port 101, a portion of the shampoo flowing into the first pipeline 301 is restricted from flowing into the first container 201 by the first one-way valve 411. Compared to using a solenoid valve, the first one-way valve 411 does not require power during use, saving energy and electricity, and has a low structural cost.

[0044] Furthermore, the third control valve 430 is a third check valve 431. The third check valve 431 controls the liquid flowing through the third pipeline 303 to flow unidirectionally away from the first port 101. When the pump 100 is running in the forward direction, the first port 101 generates negative pressure on both the first pipeline 301 and the third pipeline 303. The third pipeline 303 is closed under the action of the third check valve 431, while the first pipeline 301 connects the first container 201 and the first port 101 under the action of the first check valve 411. When the pump 100 is running in the reverse direction, the second port 102 generates negative pressure to draw shampoo from the second container 202. The shampoo is output from the first port 101. After the shampoo enters the third pipeline 303, the third check valve 431 opens, and the shampoo flows through the third check valve 431 to be output to the outside of the third pipeline 303 for use. Compared to using a solenoid valve, the third check valve 431, in conjunction with the first check valve 411, does not require power, is low in cost, and can open and close automatically when the pump 100 is running in both forward and reverse directions.

[0045] In one embodiment, the second control valve 420 is a second check valve 421. The second check valve 421 controls the liquid in the second container 202 to be unidirectionally transported to the second port 102 through the second pipeline 302. A fourth pipeline 304 is connected to the second pipeline 302, and the connection between the fourth pipeline 304 and the second pipeline 302 is located downstream of the second check valve 421.

[0046] When pump 100 operates in reverse, a negative pressure is created at the second port 102. Shampoo in the second container 202 flows along the second pipe 302 and through the second check valve 421, being delivered to the second port 102. At this time, the fourth control valve 440 is closed. When pump 100 operates in forward rotation, a negative pressure is created at the first port 101, drawing out the shower gel from the first container 201. The shower gel is output from the second port 102. At this time, the fourth control valve 440 opens, and the shower gel is discharged from the third pipe 303. After the shower gel is output from the second port 102, a portion of the shower gel flowing into the second pipe 302 is restricted by the second check valve 421 from flowing into the second container 202. Compared to the selected solenoid valve, the second check valve 421 does not require electricity during use and has a lower structural cost.

[0047] Furthermore, the fourth control valve 440 is a fourth check valve 441. The fourth check valve 441 controls the liquid flowing through the fourth pipeline 304 to flow unidirectionally away from the second port 102.

[0048] When pump 100 operates in reverse, the second port 102 generates negative pressure on both the second pipe 302 and the fourth pipe 304. The fourth pipe 304 is closed by the fourth check valve 441, while the second pipe 302 connects the second container 202 and the second port 102 via the second check valve 421. When pump 100 rotates forward, the first port 101 generates negative pressure to draw shower gel from the first container 201. The shower gel is output from the second port 102. After the shower gel enters the fourth pipe 304, the fourth check valve 441 opens, allowing the shower gel to flow through the fourth check valve 441 and be output to the outside of the fourth pipe 304 for use. Compared to using a solenoid valve, the fourth check valve 441, in conjunction with the second check valve 421, requires no electricity, is low-cost, and automatically opens and closes during pump 100's forward and reverse operation.

[0049] In one embodiment, the liquid extraction switching device further includes a foaming mechanism 500. The foaming mechanism 500 is connected downstream of the third pipe 303 and the fourth pipe 304. When the pump 100 rotates forward, it draws shower gel from the first container 201 and delivers it to the fourth pipe 304, which then delivers it to the foaming mechanism 500. The shower gel undergoes foaming treatment in the foaming mechanism 500 to form foam for the user. When the pump 100 rotates in reverse, it draws shampoo from the second container 202 and delivers it to the third pipe 303, which then delivers it to the foaming mechanism 500. The shampoo undergoes foaming treatment in the foaming mechanism 500 to form foam for the user. The device also includes a liquid outlet pipe 305. The third pipe 303 and the fourth pipe 304 are connected in parallel to the liquid outlet pipe 305, and the foaming mechanism 500 is mounted on the liquid outlet pipe 305. The liquid flowing through the third pipe 303 and the fourth pipe 304 flows to the liquid outlet pipe 305 and is then transported to the foaming mechanism 500.

[0050] In one embodiment, such as Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, the liquid extraction switching device also includes a five-way valve module 600. The five-way valve module 600 is provided with a first connector 601, a second connector 602, a third connector 603, a fourth connector 604, a fifth connector 605, a first cavity 606, a second cavity 607, a third cavity 608, and a fourth cavity 609. The first connector 601 can be connected to the first container 201 via a hose. The second connector 602 can be connected to the second container 202 via a hose. The third connector 603 can be connected to the first interface 101 via a hose. The fourth connector 604 can be connected to the second interface 102 via a hose. The first cavity 606 is located between the first connector 601 and the third connector 603, and the first connector 601 and the third connector 603 are connected through the first cavity 606. The hose between the first container 201 and the first connector 601, the first connector 601, the first cavity 606, the third connector 603, and the hose between the third connector 603 and the first interface 101 are sequentially connected to form the aforementioned first pipeline 301. A first control valve 410 is installed in a first cavity 606, controlling the unidirectional flow of liquid from the first connector 601 through the first cavity 606 to the third connector 603. Liquid cannot flow from the third connector 603 back to the first connector 601. A second cavity 607 is located between the second connector 602 and the fourth connector 604, which are connected through the second cavity 607. The hose between the second container 202 and the second connector 602, the second connector 602, the second cavity 607, the fourth connector 604, and the hose between the fourth connector 604 and the second interface 102 are sequentially connected to form the second pipeline 302. A second control valve 420 is installed in the second cavity 607, controlling the unidirectional flow of liquid from the second connector 602 through the second cavity 607 to the fourth connector 604. Liquid cannot flow from the fourth connector 604 back to the second connector 602. A third cavity 608 is located between the third connector 603 and the fifth connector 605. The third connector 603 and the fifth connector 605 are connected via a third cavity 608. The third connector 603, the third cavity 608, and the fifth connector 605 are sequentially connected to form the third pipeline 303. A third control valve 430 is installed in the third cavity 608, controlling the unidirectional flow of liquid from the third connector 603 through the third cavity 608 to the fifth connector 605, preventing liquid from flowing from the fifth connector 605 back to the third connector 603. A fourth cavity 609 is located between the fourth connector 604 and the fifth connector 605, which are connected via the fourth cavity 609. The fourth connector 604, the fourth cavity 609, and the fifth connector 605 are sequentially connected to form the fourth passage. A fourth control valve 440 is installed in the fourth cavity 609, controlling the unidirectional flow of liquid from the fourth connector 604 through the fourth cavity 609 to the fifth connector 605.Liquid cannot flow from the fifth connector 605 to the fourth connector 604. The first control valve 410, the second control valve 420, the third control valve 430, and the fourth control valve 440 are integrated and installed on the five-way valve module 600. At the same time, by utilizing the clever cooperation of each cavity and connector, the paths of the first pipeline 301, the second pipeline 302, the third pipeline 303, and the fourth pipeline 304 are greatly shortened. This also effectively reduces the use of hoses, simplifies the pipeline connection of the liquid pumping switching device, optimizes the installation structure, and reduces the space occupied by the overall structure.

[0051] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0052] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0053] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0054] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0055] In the description of this specification, references to terms such as "some specific embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0056] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A liquid pumping switching device, characterized in that, include: Pump (100), which is capable of reversing the direction of rotation, is provided with a first interface (101) and a second interface (102). The first container (201) and the first interface (101) are connected by a first pipe (301); The second container (202) and the second interface (102) are connected by a second pipe (302); The third pipeline (303) is connected to the first interface (101); The fourth conduit (304) is connected to the second interface (102); wherein, When the pump (100) is running in the forward direction, the liquid in the first container (201) is drawn out and flows sequentially along the first pipeline (301), the first interface (101) and the second interface (102) and is discharged outward from the fourth pipeline (304). At the same time, the third pipeline (303) is restricted from conveying liquid to the first interface (101) and the second pipeline (302) is restricted from conveying liquid to the second container (202). When the pump (100) is running in reverse, the liquid in the second container (202) is drawn out and flows sequentially along the second pipeline (302), the second interface (102) and the first interface (101) and is discharged outward from the third pipeline (303). At the same time, the fourth pipeline (304) is restricted from delivering liquid to the second interface (102) and the first pipeline (301) is restricted from delivering liquid to the first container (201).

2. The liquid extraction switching device according to claim 1, characterized in that: A first control valve (410) is installed on the first pipeline (301). When the pump (100) is running in reverse, the first control valve (410) can shut off the connection between the first interface (101) and the first container (201). A second control valve (420) is installed on the second pipeline (302). When the pump (100) is running in the forward direction, the second control valve (420) can shut off the connection between the second port (102) and the second container (202). A third control valve (430) is installed on the third pipeline (303), which can shut off the third pipeline (303) when the pump (100) is rotating in the forward direction; A fourth control valve (440) is installed on the fourth pipeline (304), which can shut off the fourth pipeline (304) when the pump (100) reverses.

3. The liquid extraction switching device according to claim 2, characterized in that: The first control valve (410) is a first check valve (411). The first check valve (411) controls the liquid in the first container (201) to be unidirectionally transported to the first interface (101) through the first pipeline (301). The third pipeline (303) is connected to the first pipeline (301) and the connection point is located downstream of the first check valve (411).

4. The liquid extraction switching device according to claim 3, characterized in that: The third control valve (430) is a third check valve (431), which controls the liquid flowing through the third pipeline (303) to flow unidirectionally away from the first interface (101).

5. The liquid extraction switching device according to claim 2, characterized in that: The second control valve (420) is a second check valve (421). The second check valve (421) controls the liquid in the second container (202) to be unidirectionally transported to the second interface (102) through the second pipeline (302). The fourth pipeline (304) is connected to the second pipeline (302) and the connection point is located downstream of the second check valve (421).

6. The liquid extraction switching device according to claim 5, characterized in that: The fourth control valve (440) is a fourth check valve (441), which controls the liquid flowing through the fourth pipeline (304) to flow unidirectionally away from the second interface (102).

7. The liquid extraction switching device according to claim 1, characterized in that: It also includes a foaming mechanism (500) connected downstream of the third pipe (303) and the fourth pipe (304).

8. The liquid extraction switching device according to claim 7, characterized in that: It also includes a liquid outlet pipe (305), the third pipe (303) and the fourth pipe (304) are connected in parallel to the liquid outlet pipe (305), and the foaming mechanism (500) is installed on the liquid outlet pipe (305).

9. The liquid extraction switching device according to any one of claims 2 to 6, characterized in that: It also includes a five-way valve module (600), which is provided with a first connector (601), a second connector (602), a third connector (603), a fourth connector (604), a fifth connector (605), a first cavity (606), a second cavity (607), a third cavity (608), and a fourth cavity (609). The first connector (601) is connected to the first container (201), the second connector (602) is connected to the second container (202), the third connector (603) is connected to the first interface (101), and the fourth connector (604) is connected to the second interface (102). The first cavity (606) is located between the first connector (601) and the third connector (603), and the first control valve (410) is installed in the first cavity (606) to control the unidirectional flow of liquid from the first connector (601) through the first cavity (606) to the third connector (603); The second cavity (607) is located between the second connector (602) and the fourth connector (604), and the second control valve (420) is installed in the second cavity (607) to control the unidirectional flow of liquid from the second connector (602) through the second cavity (607) to the fourth connector (604); The third cavity (608) is located between the third connector (603) and the fifth connector (605), and the third control valve (430) is installed in the third cavity (608) to control the unidirectional flow of liquid from the third connector (603) through the third cavity (608) to the fifth connector (605); The fourth cavity (609) is located between the fourth connector (604) and the fifth connector (605), and the fourth control valve (440) is installed in the fourth cavity (609) to control the unidirectional flow of liquid from the fourth connector (604) to the fifth connector (605) through the fourth cavity (609).

10. The liquid extraction switching device according to claim 1 or 2, characterized in that: The first pipeline (301), the third pipeline (303) and the first interface (101) are connected by a first tee fitting (701), and the second pipeline (302), the fourth pipeline (304) and the second interface (102) are connected by a second tee fitting (702).

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