Four-way valve

Abstract

The main valve (10) includes a first valve chamber (11) and a first valve core (12), the first valve core (12) being disposed within the first valve chamber (11), the main valve (10) having an intake port (13), an exhaust port (14), a first port (15), and a second port (16), the main valve (10) includes a second valve chamber (21) and a second valve core (22), the second valve core (22) being disposed within the second valve chamber (21), the guide valve (20) having a guide valve inlet (23), a guide valve outlet (24), a third port (25), and a fourth port (26), the guide valve (20) having a guide valve inlet (23), a guide valve outlet (24), a third port (25), and a fourth port (26), the guide valve (20) having a guide valve outlet (26), a guide valve inlet (26), a guide valve outlet ... inlet (26), a guide valve outlet (26), a guide valve outlet (26), a guide valve inlet (26), a guide valve outlet (26), a guide valve outlet (26), a guide valve inlet (26), a guide valve outlet (26), a guide valve outlet (26), a guide valve inlet (26 The four-way switching valve includes a guide valve (20), in which the valve outlet (24) and the exhaust pipe port (14) are connected via a first capillary tube (31), the guide valve inlet (23) and the intake pipe port (13) are connected, and the third pipe port (25) and the fourth pipe port (26) are connected to the main valve (10), respectively, and a one-way valve structure provided between the guide valve outlet (24) and the exhaust pipe port (14) and / or between the guide valve inlet (23) and the intake pipe port (13), thereby solving the problem of direction switching failure occurring in the prior art.

Description

[Technical field]

[0001] This application claims priority to a patent application filed on May 20, 2020 with the State Intellectual Property Office, bearing application number 202010432763.9 and titled "Four-way directional control valve", as well as to a patent application filed on the same day with the State Intellectual Property Office, bearing application number 202020854077.6 and titled "Four-way directional control valve", as well as to a patent application filed on the same day with the State Intellectual Property Office, bearing application number 202010432752.0 and titled "Guide valve and four-way directional control valve having the same". We claim priority, as well as the priority of a patent application filed on the same day with the State Intellectual Property Office, bearing application number 202020852791.1 and titled "Guide valve and four-way directional control valve having the same", as well as the priority of a patent application filed on the same day with the State Intellectual Property Office, bearing application number 202010431977.4 and titled "Four-way directional control valve", as well as the priority of a patent application filed on the same day with the State Intellectual Property Office, bearing application number 202020852777.1 and titled "Four-way directional control valve".

[0002] The present application relates to the technical field of directional control valves, and more particularly to four-way directional control valves. [Background technology]

[0003] At present, a conventional four-way switching valve includes a main valve and a guide valve, the main valve and the guide valve are connected via a capillary tube, and the guide valve is used to move the valve core of the main valve so as to switch the flow port in the main valve.

[0004] As shown in Fig. 1, a conventional four-way valve is switched to the right as an example. The guide valve 2' draws high pressure gas into the left cylinder 11' of the main valve 1', and the high pressure gas pushes and moves the piston 12', which moves the slider 13' to the right. In the process of moving to the right, the slider 13' moves to the middle position of the slider holder, and at this time, the four connecting pipes of the main valve 1' are interconnected, causing a gas flow, so that the pressure of the inlet pipe of the main valve 1' decreases and the pressure of the outlet pipe of the main valve increases. When the pressure of the outlet pipe of the main valve increases, the air pressure of the exhaust pipe of the guide valve interconnected with it increases, and the air pressure of the pipeline connected to the exhaust pipe of the guide valve 2' increases, and finally the pressure of the right cylinder of the main valve 1' interconnected with this pipeline increases. Because the left cylinder 11' pushes the piston 12' to move it to the right, when the pressure difference on both sides of the piston 12' decreases and balances out due to an increase in pressure in the right cylinder, the piston 12' cannot continue to push the slider 13', so the slider 13' cannot reach the end position on the right, and the direction change fails. If the direction change fails, the four-way valve cannot be repaired and can only be replaced with a new four-way valve. Summary of the Invention

[0005] The present application provides a four-way valve to solve the problem that directional switching is prone to failure in the prior art.

[0006] The present application relates to a main valve having a first valve chamber and a first valve core, the first valve core being disposed in the first valve chamber, the main valve being provided with an intake pipe port, an exhaust pipe port, a first pipe port and a second pipe port, when the intake pipe port and the first pipe port are communicated via the first valve chamber, the exhaust pipe port and the second pipe port are communicated, and when the intake pipe port and the second pipe port are communicated via the first valve chamber, the exhaust pipe port and the first pipe port are communicated. The present application relates to a main valve having a first valve chamber and a first valve core, the first valve core being disposed in the first valve chamber, the second valve chamber and a second valve core, the second valve core being disposed in the first valve chamber, Provided is a four-way switching valve including: a guide valve provided in a second valve chamber, the guide valve having a guide valve inlet, a guide valve outlet, a third pipe port and a fourth pipe port, the guide valve outlet and the exhaust pipe port being communicated with a first capillary tube, the guide valve inlet and the intake pipe port being communicated with a second capillary tube, and the third pipe port and the fourth pipe port being communicated with a main valve, respectively; and a one-way valve structure provided between the guide valve outlet and the exhaust pipe port and / or between the guide valve inlet and the intake pipe port.

[0007] Furthermore, the one-way valve structure includes a first one-way valve disposed between the guide valve outlet and the exhaust pipe port for controlling a flow direction of the fluid between the guide valve outlet and the exhaust pipe port, wherein the first one-way valve is disposed in a central portion of the second capillary tube, or the first one-way valve is disposed at a connection point between the second capillary tube and the guide valve inlet.

[0008] Furthermore, the one-way valve structure includes a second one-way valve disposed between the guide valve inlet and the intake pipe port for controlling the flow direction of the fluid between the guide valve inlet and the intake pipe port, wherein the second one-way valve is disposed in a central portion of the first capillary tube, or the second one-way valve is disposed at a connection point between the first capillary tube and the guide valve outlet.

[0009] Additionally, the four-way valve further includes a first pressure accumulator disposed in the second capillary tube and located downstream of the second one-way valve.

[0010] Furthermore, the second one-way valve includes a valve body having a pressure accumulator chamber forming the first pressure accumulator, and a third valve core provided within the pressure accumulator chamber.

[0011] Additionally, the four-way valve further includes an accumulator tank disposed in the second capillary tube and downstream of the second one-way valve, the accumulator tank having a pressure accumulation chamber and forming a first accumulator.

[0012] Furthermore, the first valve core includes two pistons, a connecting rod and a slider, the two pistons are spaced apart, and the two pistons divide the main valve into a first partition chamber, a first valve chamber and a second partition chamber which are independent of each other, the connecting rods are respectively connected to the two pistons, and the slider is connected to the connecting rod and located between the two pistons, and is used to adjust the communication and blocking between the exhaust pipe port and the first pipe port or the second pipe port.

[0013] Furthermore, the four-way valve further includes a third capillary tube respectively communicating with the first partition chamber and the third pipe port, and a fourth capillary tube respectively communicating with the second partition chamber and the fourth pipe port.

[0014] Furthermore, the first one-way valve has a structure that is molded integrally with the exhaust pipe port or the guide valve outlet.

[0015] Furthermore, the second one-way valve is structured to be molded integrally with the intake pipe port or the guide valve inlet.

[0016] Furthermore, the first pressure accumulator is structured to be molded integrally with the guide valve inlet.

[0017] The one-way valve structure further includes a third one-way valve disposed at the guide valve inlet.

[0018] Furthermore, the second valve chamber includes a one-way valve chamber and a directional control chamber which are connected to each other, the guide valve inlet and the one-way valve chamber are connected to each other, the third one-way valve is provided in the one-way valve chamber, and the second valve core is provided in the directional control chamber.

[0019] Additionally, the one-way valve chamber is located above the directional control chamber.

[0020] Furthermore, the one-way valve chamber and the directional control chamber are integrally molded.

[0021] Furthermore, the one-way valve chamber and the directional control chamber are molded as separate bodies and are fixedly connected to each other.

[0022] Additionally, the guide valve further includes a second pressure accumulator disposed between the one-way valve chamber and the directional control chamber and located downstream of the third one-way valve.

[0023] Additionally, the guide valve further includes a second pressure accumulator, and the third one-way valve has a one-way valve chamber that defines the second pressure accumulator.

[0024] Furthermore, the third one-way valve includes a flow plate provided in the one-way valve chamber and having a flow hole, and a blocking plate provided movably in the one-way valve chamber, located below the flow plate, and having a blocking position for blocking the flow hole and an opening position for opening the flow hole.

[0025] Additionally, the third one-way valve further includes a return member for driving the shutoff plate into the shutoff position.

[0026] Furthermore, the axis of the guide valve inlet, the axis of the guide valve outlet, the axis of the third pipe port, and the axis of the fourth pipe port are all located on the same plane.

[0027] Furthermore, the guide valve further includes a drive assembly provided on the guide valve for driving and moving the second valve core.

[0028] When the technical aspects of the present application are applied, the four-way switching valve includes a main valve, a guide valve, and a one-way valve structure, in which the guide valve outlet and the exhaust pipe port are communicated through a first capillary tube, the guide valve inlet and the intake pipe port are communicated through a second capillary tube, and the one-way valve structure is provided between the guide valve outlet and the exhaust pipe port, and / or between the guide valve inlet and the intake pipe port. The one-way valve structure can control the flow direction of the fluid between the guide valve outlet and the exhaust pipe port, or between the guide valve inlet and the intake pipe port. By providing the one-way valve structure between the guide valve outlet and the exhaust pipe port, when gas flows inside the main valve, the high-pressure gas in the exhaust pipe port does not flow in the opposite direction into the guide valve outlet, so that the guide valve outlet is still in a low-pressure state, and further, it can be ensured that the pipe port communicated with the guide valve outlet is in a low-pressure state. When this one-way valve structure is provided between the guide valve inlet and the intake port, when gas flows inside the main valve, the high-pressure gas in the guide valve will not flow in the opposite direction into the intake port, so that the guide valve can still have high-pressure gas, and the main valve connected to the guide valve can be ensured to have high-pressure gas inside. In this way, it can be ensured that there is a pressure difference between the two sides of the first valve core, and the first valve core can continue to move to complete the direction switching operation. This device can ensure that the device's direction switching is normal, and can avoid the situation where the direction switching fails due to the gas flow inside the main valve. [Brief description of the drawings]

[0029] The drawings in the specification which form a part of this application are intended to provide a further understanding of the application, and the schematic examples and their explanations in the application are intended to help interpret the application and do not constitute undue limitations on the application.

[0030] [Figure 1] FIG. 1 shows a schematic diagram of the structure of a four-way switching valve provided by the prior art. [Diagram 2] 1 shows a structural schematic diagram of a four-way switching valve provided by an embodiment of the present application. [Diagram 3] FIG. 2 is a structural schematic diagram of a first state of a four-way selector valve according to yet another embodiment of the present application. [Figure 4] 4 is a structural schematic diagram of the four-way selector valve in FIG. 3 in a second state; [Diagram 5] FIG. 4 shows a schematic diagram of the structure of the guide valve.

[0031] Here, the above drawings include the following reference numbers: 1' main valve, 11' left cylinder, 12' piston, 13' slider, 14' intake pipe, 2' guide valve, 10 main valve, 11 first valve chamber, 12 first valve core, 13 intake port, 14 exhaust port, 15 first port, 16 second port, 20 guide valve, 21 second valve chamber, 22 second valve core, 23 guide valve inlet, 24 guide valve outlet, 25 third pipe port, 26 fourth pipe port, 27 one-way valve chamber, 28 directional control chamber, 31 first capillary, 32 second capillary, 33 third capillary, 34 fourth capillary, 41 first one-way valve, 42 second one-way valve, 43 third one-way valve, 431 flow plate, 432 shutoff plate, 50 first pressure accumulator. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] Hereinafter, the technical aspects of the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, but it is clear that the described embodiments are only some of the embodiments of the present application, and are not all of the embodiments. The following description of at least one exemplary embodiment is merely explanatory in nature and does not impose any restrictions on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor shall fall within the scope of protection of the present application.

[0033] As shown in Fig. 2, the embodiment of the present application provides a four-way switching valve including a main valve 10, a guide valve 20 and a one-way valve structure. Here, the main valve 10 has a first valve chamber 11 and a first valve core 12, the first valve core 12 is disposed in the first valve chamber 11, the main valve 10 is provided with an intake pipe port 13, an exhaust pipe port 14, a first pipe port 15 and a second pipe port 16, when the intake pipe port 13 and the first pipe port 15 are communicated through the first valve chamber 11, the exhaust pipe port 14 and the second pipe port 16 are communicated, when the intake pipe port 13 and the second pipe port 16 are communicated through the first valve chamber 11, the exhaust pipe port 14 and the first pipe port 15 are communicated. Specifically, the intake pipe port 13 is used to connect with a high-pressure pipeline, and the exhaust pipe port 14 is used to connect with a low-pressure pipeline. The guide valve 20 has a second valve chamber 21 and a second valve core 22, the second valve core 22 is disposed in the second valve chamber 21, the guide valve 20 has a guide valve inlet 23, a guide valve outlet 24, a third pipe port 25 and a fourth pipe port 26, the guide valve outlet 24 and the exhaust pipe port 14 are communicated through a first capillary tube 31, the guide valve inlet 23 and the intake pipe port 13 are communicated through a second capillary tube 32, and the third pipe port 25 and the fourth pipe port 26 are respectively communicated with the main valve 10. The one-way valve structure is disposed between the guide valve outlet 24 and the exhaust pipe port 14 and / or between the guide valve inlet 23 and the intake pipe port 13.

[0034] By providing this one-way valve structure between the guide valve outlet 24 and the exhaust pipe port 14, when gas flows inside the main valve 10, the high-pressure gas in the exhaust pipe port 14 will not flow in the opposite direction into the guide valve outlet 24, so that the guide valve outlet 24 can still be in a low-pressure state, and the pipe port connected to the guide valve outlet 24 can be guaranteed to be in a low-pressure state. By providing this one-way valve structure between the guide valve inlet 23 and the intake pipe port 13, when gas flows inside the main valve 10, the high-pressure gas in the guide valve 20 will not flow in the opposite direction into the intake pipe port 13, so that the guide valve 20 can still have high-pressure gas, and the main valve 10 connected to the guide valve 20 can be guaranteed to have high-pressure gas. In this way, it can be guaranteed that there is a pressure difference on both sides of the first valve core 12, and the first valve core 12 continues to move to complete the direction switching operation. This device ensures that the device's directional switching is normal, and can avoid the situation where the directional switching fails due to the gas flow in the main valve, and the device has a simple structure, low cost, and is easy to process and manufacture.

[0035] Specifically, the one-way valve structure includes a first one-way valve 41 disposed between the guide valve outlet 24 and the exhaust pipe port 14 for controlling the flow direction of the fluid between the guide valve outlet 24 and the exhaust pipe port 14. The first one-way valve 41 is used to prevent the fluid from flowing from the exhaust pipe port 14 to the guide valve outlet 24, and the second one-way valve 41 is used to allow the fluid to flow from the guide valve outlet 24 to the exhaust pipe port 14.

[0036] Here, the first one-way valve 41 may be provided at the connection between the first capillary tube 31 and the exhaust pipe port 14, or may be provided at the center of the first capillary tube 31, or may be provided at the connection between the first capillary tube 31 and the guide valve outlet 24. It is sufficient to prevent the high-pressure gas in the exhaust pipe port 14 from returning from the exhaust pipe port 14 to the guide valve outlet 24. Here, the first one-way valve 41 may have a structure molded integrally with the exhaust pipe port 14 or may have a structure molded integrally with the guide valve outlet 24 so that the parts are integrated and installation is easy. In this embodiment, the first one-way valve 41 is provided at the center of the first capillary tube 31, and thus the installation of the first one-way valve 41 is easy.

[0037] Specifically, the one-way valve structure includes a second one-way valve 42 disposed between the guide valve inlet 23 and the intake pipe port 13 for controlling the flow direction of the fluid between the guide valve inlet 23 and the intake pipe port 13. Specifically, the second one-way valve 42 is used to prevent the fluid from flowing from the guide valve inlet 23 to the intake pipe port 13, and the second one-way valve 42 is used to allow the fluid to flow from the intake pipe port 13 to the guide valve inlet 23. By providing the second one-way valve 42, when gas flows inside the main valve 10, the high-pressure gas in the guide valve 20 does not flow in the opposite direction into the intake pipe port 13, so that the guide valve 20 can still have high-pressure gas, and further, it can be ensured that the inside of the main valve 10 communicated with the guide valve 20 has high-pressure gas, which drives the first valve core 12 to continue moving, thereby completing the direction switching operation. By providing the first one-way valve 41, it is possible to ensure that the low pressure side of the first valve core 12 is in a low pressure state, and by providing the second one-way valve 42, it is possible to ensure that the high pressure side of the first valve core 12 is in a high pressure state, thus further ensuring that the directional switching of the device is performed normally, and avoiding the situation where the directional switching fails due to the gas flow in the main valve 10.

[0038] Here, the second one-way valve 42 may be provided at the connection between the second capillary tube 32 and the intake pipe port 13, or may be provided at the center of the second capillary tube 32, or may be provided at the connection between the second capillary tube 32 and the guide valve inlet 23. It is sufficient to prevent the high-pressure gas in the guide valve 20 from returning from the guide valve inlet 23 to the intake pipe port 13. Here, the second one-way valve 42 may have a structure molded integrally with the intake pipe port 13 or may have a structure molded integrally with the guide valve inlet 23 so that the parts are integrated and installation is easy. In this embodiment, the second one-way valve 42 is provided at the center of the second capillary tube 32, and thus the installation of the second one-way valve 42 is easy.

[0039] Here, the four-way valve further includes a first pressure accumulator 50 provided in the second capillary 32 and downstream of the second one-way valve 42. By providing the first pressure accumulator 50, high-pressure gas can be stored in the first pressure accumulator 50, and when the pressure at the intake port 13 drops, the high-pressure gas previously stored in the first pressure accumulator 50 flows through the guide valve 20 into the main valve 10, further ensuring the normal movement of the first valve core 12.

[0040] Here, the first accumulator 50 may be an integral structure with the second one-way valve 42, or may be two structures independent of each other. In this embodiment, the four-way valve further includes an accumulator tank provided in the second capillary tube 32 and located downstream of the second one-way valve 42, and the accumulator tank has a pressure accumulation chamber and forms the first accumulator 50. By providing the second one-way valve 42 and the accumulator tank independent of each other, installation and maintenance can be facilitated, and the structure is simple and the cost is low.

[0041] Of course, the first pressure accumulator 50 may be provided as an integral part of the second one-way valve 42, specifically, the second one-way valve 42 includes a valve body and a third valve core. The valve body has a pressure accumulator chamber forming the first pressure accumulator 50. The third valve core is provided within the pressure accumulator chamber. This device can provide a one-way function while at the same time providing the ability to store gas.

[0042] Here, the four-way valve of the present application may be a slider-type directional control valve or a piston-type large-capacity directional control valve. In this embodiment, the four-way valve is a slider-type directional control valve, specifically, the first valve core 12 includes two pistons, a connecting rod and a slider, the two pistons are spaced apart, the two pistons divide the main valve 10 into a first partition chamber, a first valve chamber 11 and a second partition chamber that are independent of each other, the connecting rods are respectively connected to the two pistons, and the slider is connected to the connecting rod and located between the two pistons. The third pipe port is connected to the first partition chamber, and the fourth pipe port is connected to the second partition chamber. By controlling the movement of the second valve core 22 in the guide valve 20, it is possible to control the high-pressure gas in the guide valve 20 to flow into the first partition chamber or the second partition chamber. When the high-pressure gas flows into the first partition chamber, the piston on the left side in the figure can be pushed and moved to the right, and the slider can be moved to the right. After the slider has moved to a predetermined position, the high-pressure gas that has flowed into the intake pipe port 13 can flow out from the first pipe port 15 after passing through the first valve chamber 11. When the high-pressure gas flows into the second partition chamber, the piston on the right side in the figure can be pushed and moved to the left, and the slider can be moved to the left. After the slider has moved to a predetermined position, the high-pressure gas that has flowed in from the intake pipe port 13 can flow out from the second pipe port 16 after passing through the first valve chamber 11.

[0043] Here, the four-way switching valve further includes a third capillary tube 33 and a fourth capillary tube 34. Specifically, the third capillary tube 33 is connected to the first partition chamber and the third pipe port 25, respectively, and the fourth capillary tube 34 is connected to the second partition chamber and the fourth pipe port 26, respectively. The guide valve 20 and the main valve 10 are connected to each other via the capillaries, which simplifies the structure and makes the connection easy.

[0044] 3 to 5, in yet another embodiment of the present application, the one-way valve structure includes a third one-way valve 43 provided at the guide valve inlet 23. Specifically, the third one-way valve 43 may be provided outside the guide valve inlet 23 or may be provided inside the guide valve inlet 23. The third one-way valve 43 is used to control the flow direction of the fluid at the guide valve inlet 23, specifically, the third one-way valve 43 is used to prevent the fluid from flowing out of the guide valve inlet 23 and only allow the fluid to flow from the guide valve inlet 23 into the second valve chamber 21.

[0045] With the above structure, the third one-way valve 43 can prevent the high-pressure gas in the guide valve 20 from flowing out from the guide valve inlet 23. In use, the guide valve inlet 23 communicates with the intake pipe port 13 of the main valve 10, and when the pressure of the intake pipe port 13 drops, the third one-way valve 43 can prevent the high-pressure gas in the guide valve 20 from flowing from the guide valve inlet 23 into the intake pipe port 13 of the main valve 10, thus ensuring that the guide valve 20 still has high-pressure gas, and further ensuring that the inside of the main valve 10 communicated with the guide valve 20 has high-pressure gas, which drives the first valve core 12 in the main valve 10 to continue moving, completing the direction switching operation. The provision of this guide valve 20 ensures that the direction switching of the four-way switching valve is performed normally, and can avoid the situation in which the direction switching fails due to the gas flow in the main valve 10.

[0046] In this embodiment, the third one-way valve 43 is located in the guide valve 20. Specifically, the second valve chamber 21 includes a one-way valve chamber 27 and a directional control chamber 28 which are connected to each other, the guide valve inlet 23 and the one-way valve chamber 27 are connected to each other, the third one-way valve 43 is provided in the one-way valve chamber 27, and the second valve core 22 is provided in the directional control chamber 28. With the above design, the third one-way valve 43 and the guide valve 20 are integrated to simplify the structure of the device and facilitate installation on the guide valve 20. Here, the one-way valve chamber 27 and the directional control chamber 28 may be provided as an integrally molded structure, or the one-way valve chamber 27 and the directional control chamber 28 may be provided as separate bodies which are fixedly connected to each other.

[0047] Here, the guide valve inlet 23 and the other three flow ports may be provided opposite each other on both sides of the guide valve 20, or the guide valve inlet 23 may be provided at one end of the guide valve 20 and the other three flow ports may be provided at one side of the guide valve 20. In contrast, the one-way valve chamber 27 and the direction switching chamber 28 may be arranged vertically within the guide valve 20, or the one-way valve chamber 27 and the direction switching chamber 28 may be arranged coaxially. In this embodiment, the guide valve inlet 23 and the other three flow ports are provided opposite each other on both sides of the guide valve 20, and the one-way valve chamber 27 is located above the direction switching chamber 28.

[0048] Specifically, this guide valve 20 further includes a second accumulator provided between the one-way valve chamber 27 and the directional switching chamber 28, and downstream of the third one-way valve 43. By providing the second accumulator, a certain amount of high-pressure gas entering from the guide valve inlet 23 can be stored, and when the supply of high-pressure gas is insufficient, it can be replenished with high-pressure gas from the second accumulator, further ensuring normal operation of the device.

[0049] Of course, in other embodiments, a second pressure accumulator may be provided in the third one-way valve, and the gas may be stored in the one-way valve chamber, thus making the third one-way valve have two functions: one-way and gas storage. The above design can simplify the structure of the device, and make the third one-way valve have multiple functions.

[0050] Specifically, the third one-way valve 43 includes a flow plate 431 and a blocking plate 432. Here, the flow plate 431 is provided in the one-way valve chamber 27, the flow plate 431 is provided with a flow hole, the blocking plate 432 is movably provided in the one-way valve chamber 27 and is located below the flow plate 431, and the blocking plate 432 has a blocking position for blocking the flow hole and an opening position for opening the flow hole. When the fluid enters the one-way valve chamber 27 from the upper guide valve inlet 23, the fluid collides with the blocking plate 432, causing the blocking plate 432 to move away from the flow plate 431, and the flow hole is in a flowing state, so that the fluid can enter the direction switching chamber 28; when the fluid moves in the reverse direction, the blocking plate 432 is driven to move upward, causing the blocking plate 432 to come into close contact with the flow plate 431, and further blocking the flow hole. The above device has a simple structure, is easy to process, and has a low production cost.

[0051] Here, the third one-way valve 43 further includes a return member for driving the shutoff plate 432 to the shutoff position, so that the flow hole can be instantly shut off when the guide valve 20 is not operated, and ensures that the shutoff plate 432 is always in the shutoff position in all cases other than when fluid flows into the guide valve 20 from the guide valve inlet 23.

[0052] In this embodiment, the axis of the guide valve inlet 23, the axis of the guide valve outlet 24, the axis of the third pipe port 25 and the axis of the fourth pipe port 26 are all located on the same plane. The above design makes the structure of the device compact, and the space occupied by the entire device can be made as small as possible.

[0053] Specifically, the guide valve 20 further includes a drive assembly provided on the guide valve 20, which drives and moves the second valve core 22. By providing the drive assembly, it becomes easy to operate and control the movement of the second valve core 22 in real time.

[0054] The four-way valve provided by the present application has a simple structure and low cost. By installing a one-way valve, the problem that the conventional four-way valve fails to switch directions due to gas flow during direction switching can be solved, the normal operation of the four-way valve can be ensured, and the service life of the device can be extended.

[0055] It should be noted that the terminology used herein is merely for the purpose of describing specific embodiments and is not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form, and further, when the terms "comprise" and / or "comprising" are used herein, they should be understood to indicate the presence of features, steps, operations, devices, assemblies, and / or combinations thereof.

[0056] Unless otherwise specifically stated, the relative arrangements, formulas and values ​​of the components and steps described in these embodiments do not limit the scope of the present application. At the same time, it should be understood that for convenience of description, the size of each part shown in the drawings is not drawn according to actual proportionality. Although the techniques, methods and equipment known to those skilled in the art are not discussed in detail, the described techniques, methods and equipment should be considered as part of the permitted specification, where appropriate. In all examples shown and discussed herein, any specific values ​​are merely illustrative and should not be construed as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar symbols and letters indicate similar elements in the following drawings, and therefore, once any element is defined in one drawing, it does not require further description in subsequent drawings.

[0057] In the description of this application, orientations or positional relationships indicated by directional terms such as "front", "rear", "up", "down", "left", "right", "lateral, longitudinal, vertical, horizontal" and "top, bottom" are generally orientations or positional relationships based on illustrations, and are merely for the convenience and simplification of the description of this application. Unless otherwise stated, these directional terms do not indicate or imply that a specified device or element has a particular orientation or must be constructed and operated in a particular orientation, and therefore should not be understood as limiting the scope of protection of this application. The directional terms "inside" and "outside" should be understood to mean inside and outside with respect to the contour of each member itself.

[0058] For ease of description, spatially relative terms such as "on," "above," "on top of," "on top of," and the like may be used herein to describe the spatial location of one illustrated device or feature relative to another. Spatially relative terms should be understood as intended to include different orientations of the device during use or operation in addition to the orientation described in the drawings. For example, if a device in the drawings is inverted, it may be described as "above other devices or structures" or "on top of other devices or structures" and then positioned as "below other devices or structures" or "under other devices or structures." Thus, the exemplary term "above" may include both the orientations "above" and "below." The device may be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptions used herein may be interpreted accordingly.

[0059] Furthermore, it should be explained that the use of words such as "first", "second", etc. to limit parts is merely for the purpose of easily distinguishing corresponding parts, and unless otherwise specified, the above words do not have any special meaning and should not be understood as limiting the scope of protection of the present application.

[0060] The above is only a preferred embodiment of the present application, and is not intended to limit the present application, and those skilled in the art can make various modifications and variations to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. a main valve (10) having a first valve chamber (11) and a first valve core (12), the first valve core (12) being provided in the first valve chamber (11), the main valve (10) being provided with an intake pipe port (13), an exhaust pipe port (14), a first pipe port (15) and a second pipe port (16), when the intake pipe port (13) and the first pipe port (15) are communicated via the first valve chamber (11), the exhaust pipe port (14) and the second pipe port (16) are communicated, and when the intake pipe port (13) and the second pipe port (16) are communicated via the first valve chamber (11), the exhaust pipe port (14) and the first pipe port (15) are communicated; A guide valve (20) having a second valve chamber (21) and a second valve core (22), the second valve core (22) being provided in the second valve chamber (21), the guide valve (20) having a guide valve inlet (23), a guide valve outlet (24), a third pipe port (25) and a fourth pipe port (26), the guide valve outlet (24) and the exhaust pipe port (14) communicating with each other via a first capillary tube (31), the guide valve inlet (23) and the intake pipe port (13) communicating with each other via a second capillary tube (32), and the third pipe port (25) and the fourth pipe port (26) communicating with the main valve (10); a one-way valve structure provided between the guide valve outlet (24) and the exhaust pipe port (14) and between the guide valve inlet (23) and the intake pipe port (13); A four-way valve including:

2. The one-way valve structure includes a first one-way valve (41) disposed between the guide valve outlet (24) and the exhaust pipe port (14) for controlling a flow direction of a fluid between the guide valve outlet (24) and the exhaust pipe port (14), wherein: the first one-way valve (41) is provided in the center of the first capillary tube (31), or 2. The four-way switching valve according to claim 1, wherein the first one-way valve (41) is provided at a connection point between the first capillary tube (31) and the guide valve outlet (24).

3. The one-way valve structure includes a second one-way valve (42) provided between the guide valve inlet (23) and the intake pipe port (13) for controlling a flow direction of a fluid between the guide valve inlet (23) and the intake pipe port (13), wherein: the second one-way valve (42) is provided in the center of the second capillary tube (32), or 2. The four-way selector valve according to claim 1, wherein the second one-way valve (42) is provided at a connection point between the second capillary tube (32) and the guide valve inlet (23).

4. 4. The four-way directional valve of claim 3, further comprising a first pressure accumulator (50) disposed in the second capillary tube (32) and downstream of the second one-way valve (42).

5. The second one-way valve (42) a valve body having a pressure accumulation chamber forming the first pressure accumulation portion (50); a third valve core disposed within the pressure accumulation chamber; The four-way directional control valve of claim 4 , comprising:

6. 5. The four-way directional control valve of claim 4, further comprising an accumulator tank disposed in the second capillary tube (32) and downstream of the second one-way valve (42), the accumulator tank having an accumulator chamber and forming the first accumulator portion (50).

7. 2. The four-way selector valve according to claim 1, wherein the first valve core (12) includes two pistons, a connecting rod, and a slider, the two pistons being spaced apart from each other, the two pistons dividing the main valve (10) into a first partition chamber, the first valve chamber (11), and a second partition chamber which are independent from each other, the connecting rods being connected to the two pistons respectively, the slider being connected to the connecting rod and positioned between the two pistons, and being used to adjust communication and blocking between the exhaust pipe port (14) and the first pipe port (15) or the second pipe port (16).

8. a third capillary tube (33) in communication with the first compartment chamber and the third port (25), respectively; a fourth capillary tube (34) in communication with the second compartment chamber and the fourth port (26), respectively; The four-way directional valve of claim 7 further comprising:

9. 3. The four-way switching valve according to claim 2, wherein the first one-way valve (41) is integrally formed with the exhaust pipe port (14) or the guide valve outlet (24).

10. 4. The four-way selector valve according to claim 3, wherein the second one-way valve (42) is integrally formed with the intake pipe port (13) or the guide valve inlet (23).

11. The four-way switching valve according to claim 4, wherein the first pressure accumulator (50) is integrally formed with the guide valve inlet (23).

12. 2. The four-way selector valve according to claim 1, wherein the one-way valve structure includes a third one-way valve (43) provided at the guide valve inlet (23).

13. 13. The four-way switching valve according to claim 12, wherein the second valve chamber (21) includes a one-way valve chamber (27) and a directional control chamber (28) which are connected to each other, the guide valve inlet (23) and the one-way valve chamber (27) are connected to each other, the third one-way valve (43) is provided in the one-way valve chamber (27), and the second valve core (22) is provided in the directional control chamber (28).

14. 14. The four-way valve of claim 13, wherein the one-way valve chamber (27) is located above the directional control chamber (28).

15. 15. The four-way valve of claim 14, wherein the one-way valve chamber (27) and the directional control chamber (28) are integrally molded.

16. 15. The four-way valve according to claim 14, wherein the one-way valve chamber (27) and the directional control chamber (28) are molded as separate bodies and fixedly connected to each other.

17. 14. The four-way valve according to claim 13, wherein the guide valve (20) further comprises a second pressure accumulator disposed between the one-way valve chamber (27) and the directional control chamber (28) and located downstream of the third one-way valve (43).

18. 13. The four-way directional control valve of claim 12, wherein the guide valve (20) further includes a second pressure accumulator, and the third one-way valve (43) has a one-way valve chamber that forms the second pressure accumulator.

19. The third one-way valve (43) a flow plate (431) provided in the one-way valve chamber (27) and having flow holes; a blocking plate (432) movably disposed within the one-way valve chamber (27), located below the flow plate (431), and having a blocking position for blocking the flow hole and an opening position for opening the flow hole; The four-way directional valve of claim 14 , comprising:

20. The third one-way valve (43) 20. The four-way directional valve of claim 19, further comprising a return member for driving the shutoff plate (432) into the shutoff position.

21. 13. The four-way switching valve according to claim 12, wherein an axis of the guide valve inlet (23), an axis of the guide valve outlet (24), an axis of the third pipe port (25), and an axis of the fourth pipe port (26) are all located in the same plane.

22. The guide valve (20) is The four-way switching valve according to claim 12, further comprising a drive assembly provided on the guide valve (20) for driving and moving the second valve core (22).

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