JP2023525670A - 4-way switching valve - Google Patents

Abstract

It has a first valve chamber (11) and a first valve stem (12), the first valve stem (12) is provided in the first valve chamber (11) and the main valve (10) has , a main valve (10) provided with an intake port (13), an exhaust port (14), a first port (15) and a second port (16), and a second valve chamber. (21) and a second valve stem (22), the second valve stem (22) being provided in the second valve chamber (21) and the guide valve (20) being connected to the guide valve inlet (23). , a guide valve outlet (24), a third pipe port (25) and a fourth pipe port (26), wherein the guide valve outlet (24) and the exhaust pipe port (14) are connected to the first capillary tube (31). ), a guide valve inlet (23) and an intake pipe port (13) are communicated, and a third pipe port (25) and a fourth pipe port (26) are respectively connected to the main valve (10). provided between the guide valve (20) and 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), which are in communication with each other; A four-way switching valve, including a one-way valve structure provided in between, which can solve the problem that direction switching tends to fail in the prior art. [Selection drawing] Fig. 2

Description

This application is the priority of the patent application with application number 202010432763.9 and titled "Four-Way Switching Valve" filed with the State Intellectual Property Office of China on May 20, 2020, and The priority of the patent application with the application number 202020854077.6 and the title of the invention is "four-way switching valve" filed with the State Intellectual Property Office of China on the same day, and filed with the State Intellectual Property Office of China on the same day , the priority of the patent application with the application number 202010432752.0 and the title of the invention is "Guide valve and four-way switching valve having the same", and filed with the State Intellectual Property Office of China on the same day, the application number is 202020852791.1, the invention title of which is "guide valve and four-way switching valve having the same", and the application number 202010431977.4 filed with the State Intellectual Property Office of China on the same day. The priority of the patent application entitled "Four-Way Switching Valve", and the application number 202020852777.1 filed with the State Intellectual Property Office of China on the same day, entitled "Four-Way Switching claiming priority of the patent application which is

The present application relates to the technical field of directional switching valves, and in particular to four-way switching valves.

At present, a conventional four-way switching valve includes a main valve and a guide valve, the communication between the main valve and the guide valve is via a capillary tube, and the guide valve switches the flow port in the main valve. used to move the valve core.

As shown in FIG. 1, taking a conventional four-way switching valve to the right as an example, the guide valve 2' draws high pressure gas into the left cylinder 11' of the main valve 1', The high pressure gas pushes the piston 12' to move, causing the piston 12' to move the slider 13' to the right. In the process of moving the slider 13' to the right, the slider 13' moves to the middle position of the slider holder. pressure drops and the pressure in the outlet pipe of the main valve rises. When the pressure in the outlet pipe of the main valve rises, the air pressure in the exhaust pipe of the guide valve communicating with it rises, the air pressure in the pipeline communicating with the exhaust pipe of the guide valve 2' rises, and finally In the meantime, the pressure in the right cylinder of the main valve 1' communicating with this pipeline rises. Since the left cylinder 11' pushes the piston 12' to move it to the right, the pressure difference between the two sides of the piston 12' decreases due to the increase in the pressure of the right cylinder. cannot push and move the slider 13' to keep moving, the slider 13' cannot reach the end point position on the right side, and direction switching fails. The four-way switching valve cannot be repaired and can only be replaced with a new four-way switching valve when direction switching fails.

The present application provides a four-way switching valve to solve the problem of direction switching failure in the prior art.

The present application has a first valve chamber and a first valve core, the first valve core is provided in the first valve chamber, the main valve includes an intake pipe port, an exhaust pipe port, a first and a second pipe port are provided, and when the intake pipe port and the first pipe port are communicated through the first valve chamber, the exhaust pipe port and the second pipe port are connected to each other A main valve and a second valve that are in communication and communicate between the exhaust pipe port and the first pipe port when the intake pipe port and the second pipe port are communicated via the first valve chamber. a chamber and a second valve core, the second valve core being provided within the second valve chamber, and the guide valve having a guide valve inlet, a guide valve outlet, a third pipe port and a fourth pipe port. a guide valve outlet and an exhaust pipe port are communicated through a first capillary, a guide valve inlet and an intake pipe port are communicated through a second capillary, and a third pipe port and a fourth are provided between the guide valve, the guide valve outlet and the exhaust pipe port, and/or between the guide valve inlet and the intake pipe port, each of which communicates with the main valve; A one-way valve structure and a four-way switching valve.

Further, the one-way valve structure includes a first one-way valve provided between the guide valve outlet and the exhaust pipe port for controlling the flow direction of the fluid between the guide valve outlet and the exhaust pipe port. , wherein the first one-way valve is provided in the middle of the second capillary, or the first one-way valve is provided at the junction of the second capillary and the guide valve inlet.

Further, the one-way valve structure includes a second one-way valve provided 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 provided in the middle of the first capillary, or the second one-way valve is provided at the junction of the first capillary and the guide valve outlet.

Furthermore, the four-way switching valve further includes a first pressure accumulator provided in the second capillary and located downstream of the second one-way valve.

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

Furthermore, the four-way switching valve further includes an accumulator tank provided in the second capillary tube and positioned downstream of the second one-way valve, the accumulator tank having an accumulator chamber and a first accumulator form a part.

Furthermore, the first valve core includes two pistons, a connecting rod and a slider, the two pistons being spaced apart, and the two pistons separating the main valve into a mutually independent first partition chamber, a first a valve chamber and a second partition chamber, the connecting rods are respectively connected with two pistons, the slider is connected with the connecting rods and located between the two pistons, and is connected to the exhaust pipe port and the first partition chamber. It is used to adjust conduction and interruption with the pipe port or the second pipe port.

Furthermore, the four-way switching valve includes a third capillary tube in communication with the first partition chamber and the third port, respectively, and a fourth capillary tube in communication with the second partition chamber and the fourth port, respectively. and further including.

Further, the first one-way valve is a structure integrally molded with the exhaust pipe port or the guide valve outlet.

Furthermore, the second one-way valve is a structure integrally molded with the intake pipe inlet or the guide valve inlet.

Furthermore, the first pressure accumulator has a structure integrally formed with the guide valve inlet.

Additionally, the one-way valve structure includes a third one-way valve provided at the guide valve inlet.

Furthermore, the second valve chamber includes a one-way valve chamber and a direction switching chamber in communication with each other, the guide valve inlet and the one-way valve chamber are in communication, and the third one-way valve is in the one-way valve chamber. A second valve stem is provided within the diverting chamber.

Additionally, the one-way valve chamber is located above the directional chamber.

Furthermore, the one-way valve chamber and the direction switching chamber are integrally molded.

Furthermore, the one-way valve chamber and the directional switching chamber are molded separately and fixedly connected.

Furthermore, the guide valve further includes a second pressure accumulator provided between the one-way valve chamber and the direction switching chamber and located downstream of the third one-way valve.

Furthermore, the guide valve further comprises a second pressure accumulator, and the third one-way valve has a one-way valve chamber forming the second pressure accumulator.

Further, a third one-way valve is provided in the one-way valve chamber and includes a flow plate having a flow hole, and a flow plate movably provided in the one-way valve chamber and positioned below the flow plate, a blocking plate having a blocking position blocking the flow hole and an open position opening the flow hole.

Additionally, the third one-way valve further includes a return member for driving the blocking plate into the blocking position.

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.

Additionally, the guide valve further includes a drive assembly provided on the guide valve for driving movement of the second valve stem.

Applying the technical aspects of the present application, this four-way switching valve includes a main valve, a guide valve and a one-way valve structure, where the guide valve outlet and the exhaust pipe outlet are communicated through a first capillary tube. , the guide valve inlet and the intake pipe inlet are communicated through a second capillary, and the one-way valve structure is provided between the guide valve outlet and the exhaust pipe outlet, and/or between the guide valve inlet and the intake pipe. It is placed between the mouth. A one-way valve structure can control the flow direction of fluid between the guide valve outlet and the exhaust pipe port or between the guide valve inlet and the intake pipe port. By providing this 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 to the guide valve outlet. It is possible to ensure that the guide valve outlet is still at low pressure and further ensure that the pipe port in communication with the guide valve outlet is at low pressure. If this one-way valve structure is provided between the guide valve inlet and the intake pipe port, when gas flows inside the main valve, the high pressure gas inside the guide valve will not flow into the intake pipe port in the opposite direction. In this way, it is possible to still have high pressure gas inside the guide valve, and furthermore it is possible to ensure that the inside of the main valve, which is in communication with the guide valve, has high pressure gas. In this way, it can be ensured that there is a pressure difference across the first valve stem, and the first valve stem continues to move to complete the direction switching operation. With this device, it is possible to ensure that the direction switching of the device is performed normally, and to avoid the situation where the direction switching fails due to the gas flow in the main valve.

The drawings in the specification, which form part of the present application, are for providing a further understanding of the present application, and the schematic examples of the present application and their descriptions are for interpreting the present application. , do not constitute an undue limitation to this application.

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

Here, the above drawings include the following reference numerals.
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 pipe port, 14 exhaust pipe port, 15 first pipe port, 16 second pipe 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 direction switching chamber,
31 first capillary tube, 32 second capillary tube, 33 third capillary tube, 34 fourth capillary tube,
41 first one-way valve, 42 second one-way valve, 43 third one-way valve, 431 flow plate, 432 blocking plate, 50 first pressure accumulator.

Hereinafter, the technical aspects in the examples of the present application will be clearly and completely described with reference to the drawings in the examples of the present application. is clearly not an embodiment of The following description of at least one exemplary embodiment is merely illustrative in nature and in no way limiting to the present application and its application or uses. All other embodiments obtained by those skilled in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

As shown in FIG. 2, embodiments of the present application provide a four-way switching valve that includes 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 provided in the first valve chamber 11, and the main valve 10 includes an intake pipe. A port 13 , an exhaust port 14 , a first port 15 and a second port 16 are provided, and the inlet port 13 and the first port 15 communicate through 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. Specifically, the intake port 13 is used to connect with a high pressure pipeline, and the exhaust 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 stem 22, the second valve stem 22 being provided within the second valve chamber 21, the guide valve 20 comprising a guide valve inlet 23, It has 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, and the guide valve inlet 23 and the intake air are connected. The pipe port 13 is communicated with via the second capillary tube 32 , and the third pipe port 25 and the fourth pipe port 26 are respectively communicated with the main valve 10 . A one-way valve structure is 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 .

By providing this one-way valve structure between the guide valve outlet 24 and the exhaust pipe outlet 14 , when gas flows inside the main valve 10 , the high pressure gas in the exhaust pipe outlet 14 flows in the opposite direction to the guide valve outlet 24 . can ensure that the guide valve outlet 24 is still at low pressure and further ensure that the tube port in communication with the guide valve outlet 24 is at low pressure. If this one-way valve structure is provided between the guide valve inlet 23 and the intake pipe port 13, when gas flows inside the main valve 10, the high pressure gas inside the guide valve 20 flows into the intake pipe port 13 in the opposite direction. No flow in, thus still having high pressure gas inside the guide valve 20 and further ensuring that the inside of the main valve 10 in communication with the guide valve 20 has high pressure gas. In this way, it can be ensured that there is a pressure difference across the first valve core 12, and the first valve core 12 continues to move to complete the direction switching operation. This device can ensure that the direction switching of the device is performed normally, and avoid the situation where the direction switching fails due to the gas flow in the main valve, and the device is simple in structure. low cost, easy to process and manufacture.

Specifically, a one-way valve structure is provided between the guide valve outlet 24 and the exhaust port 14 for controlling the direction of fluid flow between the guide valve outlet 24 and the exhaust port 14 . 1 one-way valve 41 is included. A first one-way valve 41 is used to prevent fluid from flowing from the exhaust pipe outlet 14 to the guide valve outlet 24, and the first one-way valve 41 prevents fluid from flowing from the guide valve outlet 24 to the exhaust pipe outlet. 14 is used to allow flow.

Here, the first one-way valve 41 may be provided at the connection point between the first capillary tube 31 and the exhaust pipe port 14, or may be provided at the central portion of the first capillary tube 31. A one-way valve 41 may be provided at the junction of 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 that is integrally formed with the exhaust pipe port 14 so that the parts are integrated to facilitate installation, and is integrally formed with the guide valve outlet 24. structure. In this embodiment, the first one-way valve 41 is provided in the middle of the first capillary tube 31, thus facilitating the mounting of the first one-way valve 41. FIG.

Specifically, a one-way valve structure is provided between the guide valve inlet 23 and the inlet port 13 for controlling the direction of fluid flow between the guide valve inlet 23 and the inlet port 13 . 2 one-way valves 42 are included. Specifically, the second one-way valve 42 is used to prevent fluid from flowing from the guide valve inlet 23 to the intake port 13, and the second one-way valve 42 prevents fluid from flowing into the intake port 13. 13 to the guide valve inlet 23. By providing the second one-way valve 42, when the gas flows inside the main valve 10, the high pressure gas inside the guide valve 20 does not flow into the intake pipe port 13 in the opposite direction. The inside of the guide valve 20 can still have high pressure gas, and furthermore, it can be ensured that the inside of the main valve 10 communicating with the guide valve 20 has high pressure gas, and the high pressure gas causes the first valve core to Continue to drive 12 to move to complete the direction switching operation. The provision of a first one-way valve 41 ensures that the low pressure side of the first valve core 12 is at a low pressure, and the provision of a second one-way valve 42 ensures that the first valve core 12 is at low pressure. The high pressure side of 12 can be ensured to be in a high pressure state, thus further ensuring that the direction switching of the device is successful, and the gas flow in the main valve 10 will cause the direction switching to fail. You can avoid situations from appearing.

Here, the second one-way valve 42 may be provided at the connection point between the second capillary tube 32 and the intake pipe port 13, or may be provided at the central portion of the second capillary tube 32. A one-way valve 42 may be provided at the junction of the second capillary tube 32 and the guide valve inlet 23 . It is sufficient if the high pressure gas in the guide valve 20 can be prevented 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 integrally molded with the intake pipe port 13 so that the parts are integrated for easy installation, and it is integrally molded with the guide valve inlet 23. structure. In this embodiment, the second one-way valve 42 is provided in the middle of the second capillary tube 32, thus facilitating the mounting of the second one-way valve 42. FIG.

Here, the four-way switching valve further includes a first pressure accumulator 50 provided in the second capillary tube 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 pipe port 13 drops, the gas is stored in the first pressure accumulator 50 in advance. The high pressure gas can enter the main valve 10 through the guide valve 20 to further ensure the normal movement of the first valve stem 12 .

Here, the first pressure accumulator 50 may have a structure integrated with the second one-way valve 42, or may have two structures independent of each other. In this embodiment, the four-way switching valve further includes an accumulator tank provided in the second capillary tube 32 and located downstream of the second one-way valve 42, the accumulator tank having an accumulator chamber. to form the first pressure accumulator 50 . By providing the second one-way valve 42 and the accumulator tank independently of each other, installation and maintenance can be facilitated, and the structure is simple and the cost is low.

Of course, the first pressure accumulator 50 may be provided so as to form an integral structure with the second one-way valve 42. Specifically, the second one-way valve 42 includes a valve body and a third Includes valve core. The valve body has a pressure accumulator chamber forming a first pressure accumulator 50 . A third valve core is provided within the accumulator chamber. This device allows one-way functionality while simultaneously having the ability to store gas.

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

Here, this four-way switching valve further includes a third capillary 33 and a fourth capillary 34 . Specifically, the third capillary tube 33 communicates with the first compartment chamber and the third tube port 25, respectively, and the fourth capillary tube 34 communicates with the second compartment chamber and the fourth tube port 26, respectively. ing. The guide valve 20 and the main valve 10 are communicated through a capillary tube, the structure is simple, and the connection is easy.

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, as shown in FIGS. Specifically, it 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 controls the flow of fluid out of the guide valve inlet 23 . It is used to block and only allow fluid to flow from the guide valve inlet 23 into the second valve chamber 21 .

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 . During use, the guide valve inlet 23 and the intake pipe port 13 of the main valve 10 are communicated with each other. Flow from the valve inlet 23 into the inlet port 13 of the main valve 10 can be blocked, thus still having high pressure gas in the guide valve 20, and the main valve communicating with the guide valve 20. It can be ensured that the inside of 10 has high pressure gas, and this high pressure gas drives the first valve core 12 in the main valve 10 to keep moving to complete the direction switching operation. By providing this guide valve 20, it is possible to ensure that the direction switching of the four-way switching valve is performed normally, and to avoid a situation where the direction switching fails due to the gas flow in the main valve 10. .

In this embodiment the third one-way valve 43 is located within the guide valve 20 . Specifically, the second valve chamber 21 includes a one-way valve chamber 27 and a direction switching chamber 28 that are in communication with each other, the guide valve inlet 23 and the one-way valve chamber 27 are in communication, and a third one The directional valve 43 is provided in the one-way valve chamber 27 and the second valve stem 22 is provided in the directional switching chamber 28 . The above design integrates the third one-way valve 43 and the guide valve 20 to simplify the structure of the device and facilitate mounting on the guide valve 20 . Here, the one-way valve chamber 27 and the direction switching chamber 28 may be provided so as to have an integrally molded structure, or the one-way valve chamber 27 and the direction switching chamber 28 are separately molded and provided, Permanently connected.

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

Specifically, the guide valve 20 further includes a second pressure accumulation section provided between the one-way valve chamber 27 and the direction switching chamber 28 and downstream of the third one-way valve 43. include. By providing the second pressure accumulator, a certain amount of high pressure gas entering from the guide valve inlet 23 can be stored. The normal operation of the device can be further guaranteed.

Of course, in other embodiments, the second pressure accumulator may be provided within the third one-way valve, storing gas in the one-way valve chamber and thus the third one-way valve and gas storage. The above design can simplify the structure of the device and allow the third one-way valve to have multiple functions.

Specifically, this 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, and the blocking plate 432 is movably provided in the one-way valve chamber 27, and the flow Located below plate 431, blocking plate 432 has a blocking position to block the flow hole and an open position to open the flow hole. When the fluid enters into 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 flow condition. so that the fluid can enter into the direction switching chamber 28, and when the fluid moves in the reverse direction, it drives the blocking plate 432 to move upward so that the blocking plate 432 is in intimate contact with the flow plate 431. , and also block the flow holes. The above device has a simple structure, is easy to process, and has a low production cost.

Here, this third one-way valve 43 further includes a return member for driving the blocking plate 432 to the blocking position, and immediately blocks the flow hole if the guide valve 20 is not activated. and ensures that the shut-off plate 432 is always in the shut-off position at all other times than when fluid flows into the guide valve 20 from the guide valve inlet 23 .

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 allows the structure of the device to be compact and the space occupied by the whole device to be as small as possible.

Specifically, the guide valve 20 further includes a drive assembly provided in the guide valve 20 for driving the second valve core 22 to move. Providing a drive assembly facilitates real-time operational control of movement of the second valve stem 22 .

The four-way switching valve provided by the present application has a simple structure and low cost, and by installing a one-way valve, there is a problem that the direction switching fails due to the gas flow when switching the direction of the conventional four-way valve. can solve the problem, ensure the normal operation of the four-way switching valve, and extend the service life of the device.

It should be noted that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly dictates otherwise, and furthermore the terms "including" and/or "including" are used herein. It should also be understood that where terms are used, they indicate the presence of features, steps, acts, devices, assemblies and/or combinations thereof.

Unless specifically stated otherwise, the relative dispositions, formulas and numerical values of the members and steps set forth in these examples are not intended to limit the scope of this application. At the same time, for convenience of description, it should be understood that the sizes of the parts shown in the drawings are not drawn according to actual proportionality. Techniques, methods and equipment known to those skilled in the art will not be discussed in detail, but where appropriate, the techniques, methods and equipment described should be considered part of the permitted specification. In all examples shown and discussed herein, any specific values are merely exemplary and should not be construed as limiting. Accordingly, other instances of the exemplary embodiment may have different values. It should be noted that similar symbols and letters indicate similar elements in the following drawings, and thus, once any element is defined in one drawing, further description thereof is provided in subsequent drawings. does not require

In the description of this application, orientations such as "front", "back", "top", "bottom", "left", "right", "lateral, longitudinal, vertical, horizontal" and "top, bottom" Orientation or positional relationships indicated by words are generally orientations or positional relationships based on illustrations, and are merely for convenience and simplification of description of the present application, unless conflicting explanations are given. In addition, these orientation terms do not indicate or imply that the designated device or element must have a particular orientation or be configured and operated in a particular orientation, and thus the scope of protection of this application. should not be construed as limiting, and the terms "inside" and "outside" should be understood to mean inside and outside the contours of each member itself.

For convenience of description, spatially relative terms such as "on", "above", "on top of", "on top of", etc. are illustrated herein. It may be used to describe the spatial relationship between one device or feature and another device or feature. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the drawings. For example, when a device in a drawing is inverted, it is described as "above another device or structure" or "above another device or structure," followed by "below another device or structure." are" or "underneath other devices or structures". Thus, the exemplary term "above" may include both 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 here may be interpreted accordingly.

Further, it should be noted that the use of words such as "first", "second", etc. to define parts is merely for the purpose of easily distinguishing corresponding parts and is not otherwise described. As far as the above words have no special meaning, they should not be understood as limiting the scope of protection of this application.

The above are only preferred embodiments of the present application and are not intended to limit the present application, which may allow various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall all fall within the protection scope of this application.

Claims (22)

A main valve (10) having a first valve chamber (11) and a first valve stem (12), wherein said first valve stem (12) is provided within said 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 port (13) and the first port (15) communicate through the first valve chamber (11), the exhaust port (14) and the second port (16 ) are in communication with each other, and when the intake port (13) and the second port (16) are in communication via the first valve chamber (11), the exhaust port (14) and a main valve (10) communicated with the first pipe port (15);
A guide valve (20) having a second valve chamber (21) and a second valve stem (22), wherein said second valve stem (22) is provided within said 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), and the guide valve outlet ( 24) and the exhaust pipe port (14) are communicated through a first capillary (31), and the guide valve inlet (23) and the intake pipe port (13) communicate with a second capillary (32). a guide valve (20) in communication with said third port (25) and said fourth port (26) respectively communicating with said main valve (10);
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); a one-way valve structure;
, including a four-way switching valve. The one-way valve structure is provided between the guide valve outlet (24) and the exhaust pipe port (14), and the flow of fluid between the guide valve outlet (24) and the exhaust pipe port (14) is including a first one-way valve (41) for controlling flow direction, wherein:
Said first one-way valve (41) is provided in the middle of said second capillary (32), or
2. The four-way switching valve according to claim 1, wherein said first one-way valve (41) is provided at a connection point between said second capillary tube (32) and said guide valve inlet (23). The one-way valve structure is provided between the guide valve inlet (23) and the intake pipe port (13), and the flow of fluid between the guide valve inlet (23) and the intake pipe port (13) is a second one-way valve (42) for controlling flow direction, wherein:
The second one-way valve (42) is provided in the center of the first capillary (31), or
2. The four-way switching valve according to claim 1, wherein said second one-way valve (42) is provided at a connection point between said first capillary tube (31) and said guide valve outlet (24). 4. The four-way of claim 3, further comprising a first pressure accumulator (50) provided in said second capillary tube (32) and located downstream of said second one-way valve (42). switching valve. The second one-way valve (42) is
a valve body having an accumulator chamber forming the first accumulator (50);
a third valve core provided within the pressure accumulation chamber;
5. The four-way switching valve of claim 4, comprising: further comprising an accumulator tank provided in said second capillary tube (32) and located downstream of said second one-way valve (42), said accumulator tank having an accumulator chamber; 5. The four-way switching valve according to claim 4, forming a pressure accumulator (50) of . The first valve core (12) includes two pistons, a connecting rod and a slider, the two pistons are spaced apart, and the two pistons separate the main valve (10) from each other. partitioning into a first partition chamber, said first valve chamber (11) and a second partition chamber, said connecting rods being respectively connected with two said pistons, said slider being connected with said connecting rods, and two located between the two pistons and used to adjust the communication and disconnection between the exhaust pipe port (14) and the first pipe port (15) or the second pipe port (16), The four-way switching valve according to claim 1. a third capillary tube (33) in communication with said first compartment chamber and said third tube port (25) respectively;
a fourth capillary tube (34) in communication with said second compartment chamber and said fourth tube port (26) respectively;
8. The four-way switching valve of claim 7, further comprising: 3. The four-way switching valve according to claim 2, wherein said first one-way valve (41) is a structure integrally formed with said exhaust pipe port (14) or said guide valve outlet (24). 4. The four-way switching valve according to claim 3, wherein said second one-way valve (42) is a structure integrally molded with said intake pipe port (13) or said guide valve inlet (23). 5. The four-way switching valve according to claim 4, wherein said first pressure accumulator (50) has a structure integrally formed with said guide valve inlet (23). A four-way switching valve according to claim 1, wherein said one-way valve structure comprises a third one-way valve (43) provided at said guide valve inlet (23). Said second valve chamber (21) comprises a one-way valve chamber (27) and a direction switching chamber (28) in communication with each other, wherein said guide valve inlet (23) and said one-way valve chamber (27) are said third one-way valve (43) is provided in said one-way valve chamber (27) and said second valve core (22) is provided in said direction switching chamber (28) 13. A four-way switching valve according to claim 12. 14. The four-way valve according to claim 13, wherein the one-way valve chamber (27) is located above the directional switching chamber (28). 15. The four-way valve according to claim 14, wherein the one-way valve chamber (27) and the directional switching chamber (28) are integrally molded. 15. The four-way valve according to claim 14, wherein the one-way valve chamber (27) and the directional switching chamber (28) are molded separately and fixedly connected. The guide valve (20) is provided between the one-way valve chamber (27) and the direction switching chamber (28) and is located downstream of the third one-way valve (43). 14. The four-way switching valve of claim 13, further comprising two accumulators. 13. The method of claim 12, wherein the guide valve (20) further comprises a second pressure accumulator and the third one-way valve (43) has a one-way valve chamber forming the second pressure accumulator. Four-way switching valve. The third one-way valve (43) is
a flow-through plate (431) provided in said one-way valve chamber (27) and having flow-through holes;
movably provided in the one-way valve chamber (27) and positioned below the flow plate (431), having a blocking position for blocking the flow hole and an open position for opening the flow hole; , a blocking plate (432);
15. The four-way switching valve of claim 14, comprising: The third one-way valve (43) is
20. The four-way switching valve of claim 19, further comprising a return member for driving said blocking plate (432) into said blocking position. 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 on the same plane. 13. The four-way switching valve of claim 12, wherein the 4-way selector valve is The guide valve (20) is
13. The four-way valve of claim 12, further comprising a drive assembly provided on said guide valve (20) for driving movement of said second valve stem (22).

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