Four-way reversing valve

Abstract

The present invention provides a four-way reversing valve, which includes: a main valve, having a first valve cavity and a first valve core, the first valve core is arranged in the first valve cavity, and the main valve is provided with an air inlet, an air outlet, a first pipe port and a second pipe port; a pilot valve, having a second valve cavity and a second valve core, the second valve core is arranged in the second valve cavity, the pilot valve has a pilot valve inlet, a pilot valve outlet, a third pipe port and a fourth pipe port, the pilot valve outlet is connected to the air outlet through a first capillary, the pilot valve inlet is connected to the air inlet, and the third pipe port and the fourth pipe port are respectively connected to the main valve; a first check valve is arranged between the pilot valve outlet and the air outlet, and the first check valve is used to control the flow direction of the fluid between the pilot valve outlet and the air outlet. The technical solution provided by the present application can solve the problem of reversing failure that is prone to occur in the prior art.

Description

Technical Field

[0001] The invention relates to the technical field of reversing valves, and in particular to a four-way reversing valve. Background Art

[0002] At present, the existing four-way reversing valve includes a main valve and a pilot valve. The main valve and the pilot valve are connected through a capillary tube. The pilot valve is used to control the movement of the valve core of the main valve to switch the flow port on the main valve.

[0003] like Figure 1 As shown, the existing four-way reversing valve is explained by taking the right reversing as an example. The pilot valve 2' introduces high-pressure gas into the left cylinder 11' of the main valve 1', and the high-pressure gas pushes the piston 12' to move, and the piston 12' drives the slider 13' to move to the right. The slider 13' moves to the middle position of the slider seat during the rightward movement. At this time, the four connecting pipes of the main valve 1' are connected and cause cross-flow, the pressure of the inlet pipe of the main valve 1' decreases, and the pressure of the outlet pipe of the main valve increases. The pressure of the outlet pipe of the main valve increases, and the air pressure of the outlet pipe of the pilot valve connected thereto increases, and causes the air pressure of the pipeline connected to the outlet pipe of the pilot valve 2' to increase, and finally causes the pressure of the right cylinder of the main valve 1' connected to the pipeline to increase. Since the left cylinder 11' is pushing the piston 12' to move to the right, the pressure of the right cylinder increases, which reduces the pressure difference on both sides of the piston 12' and tends to balance, then the piston 12' cannot push the slider 13' to continue to move, and the slider 13' cannot reach the end position on the right, which will cause the reversing failure. When the four-way reversing valve fails to switch, it cannot be repaired and can only be replaced with a new one. Summary of the invention

[0004] The invention provides a four-way reversing valve to solve the problem of reversing failure that is easy to occur in the prior art.

[0005] The present invention provides a four-way reversing valve, which comprises: a main valve, having a first valve cavity and a first valve core, the first valve core is arranged in the first valve cavity, an air inlet pipe port, an air outlet pipe port, a first pipe port and a second pipe port are arranged on the main valve, when the air inlet pipe port is connected with the first pipe port through the first valve cavity, the air outlet pipe port is connected with the second pipe port; when the air inlet pipe port is connected with the second pipe port through the first valve cavity, the air outlet pipe port is connected with the first pipe port; a pilot valve, having a second valve cavity and a second valve core, the second valve core is arranged in the second valve cavity, the pilot valve has a pilot valve inlet, a pilot valve outlet, a third pipe port and a fourth pipe port, the pilot valve outlet is connected with the air outlet pipe port through a first capillary, the pilot valve inlet is connected with the air inlet pipe port, and the third pipe port and the fourth pipe port are respectively connected with the main valve; a first one-way valve, arranged between the pilot valve outlet and the air outlet pipe port, the first one-way valve is used to control the flow direction of the fluid between the pilot valve outlet and the air outlet pipe port.

[0006] Furthermore, the first one-way valve is arranged at the connection between the first capillary tube and the air outlet.

[0007] Further, the first one-way valve is arranged in the middle of the first capillary tube.

[0008] Further, the first one-way valve is arranged at the connection between the first capillary tube and the pilot valve outlet.

[0009] Furthermore, the four-way reversing valve also includes: a second capillary tube, which is connected to the air inlet and the pilot valve inlet respectively; a second one-way valve, which is arranged between the pilot valve inlet and the air inlet, and is used to control the flow direction of the fluid between the pilot valve inlet and the air inlet.

[0010] Furthermore, the four-way reversing valve further includes: a pressure storage portion, which is arranged on the second capillary tube and located downstream of the second one-way valve.

[0011] Furthermore, the second one-way valve includes: a valve body having a pressure storage chamber, the pressure storage chamber forming a pressure storage portion; and a third valve core arranged in the pressure storage chamber.

[0012] Furthermore, the four-way reversing valve further includes: a pressure storage cylinder, which is arranged on the second capillary tube and located downstream of the second one-way valve, the pressure storage cylinder having a pressure storage cavity, and the pressure storage cylinder forms a pressure storage portion.

[0013] Furthermore, the first valve core includes two pistons, a connecting rod and a slider. The two pistons are arranged at intervals. The two pistons separate the main valve into a first compartment, a first valve compartment and a second compartment that are independent of each other. The connecting rod is connected to the two pistons respectively, the slider is connected to the connecting rod, and the slider is located between the two pistons. The slider is used to adjust the connection and disconnection of the outlet pipe port with the first pipe port or the second pipe port.

[0014] Furthermore, the four-way reversing valve further includes: a third capillary tube, which is respectively connected to the first compartment and the third pipe opening; and a fourth capillary tube, which is respectively connected to the second compartment and the fourth pipe opening.

[0015] Furthermore, the first one-way valve and the air outlet or the pilot valve outlet are integrally formed.

[0016] According to the technical solution of the present invention, the four-way reversing valve includes a main valve, a pilot valve and a first one-way valve, wherein the pilot valve outlet is connected to the air outlet through a first capillary, and the first one-way valve is arranged between the pilot valve outlet and the air outlet, and the first one-way valve is used to control the flow direction of the fluid between the pilot valve outlet and the air outlet. Specifically, the first one-way valve allows the fluid to flow from the pilot valve outlet to the air outlet, and prevents the fluid from flowing in the opposite direction. By setting the first one-way valve, when there is gas flow inside the main valve, the high-pressure gas in the air outlet will not flow back into the pilot valve outlet, so that the pilot valve outlet is still in a low-pressure state, and then the pipe port connected to the pilot valve outlet can be ensured to be in a low-pressure state, so that the pressure difference on both sides of the first valve core can be ensured, so that the first valve core continues to move to complete the reversing operation. The device can ensure the normal reversing of the device and avoid the reversing failure caused by gas flow inside the main valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 The structure diagram of the four-way reversing valve provided by the prior art is shown;

[0019] Figure 2 A structural schematic diagram of a four-way reversing valve provided according to an embodiment of the present invention is shown.

[0020] The above drawings include the following reference numerals:

[0021] 1`, main valve; 11`, left cylinder; 12`, piston; 13`, slider; 14`, air intake pipe; 2`, pilot valve;

[0022] 10. Main valve; 11. First valve chamber; 12. First valve core; 13. Air inlet; 14. Air outlet; 15. First pipe opening; 16. Second pipe opening;

[0023] 20. pilot valve; 21. second valve chamber; 22. second valve core; 23. pilot valve inlet; 24. pilot valve outlet; 25. third pipe port; 26. fourth pipe port;

[0024] 31. first capillary tube; 32. second capillary tube; 33. third capillary tube; 34. fourth capillary tube;

[0025] 41. First one-way valve; 42. Second one-way valve; 50. Pressure storage unit. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] like Figure 2 As shown, the embodiment of the present application provides a four-way reversing valve, which includes: a main valve 10, a pilot valve 20 and a first one-way valve 41. The main valve 10 has a first valve cavity 11 and a first valve core 12, the first valve core 12 is arranged in the first valve cavity 11, and the main valve 10 is provided with an inlet pipe port 13, an outlet pipe port 14, a first pipe port 15 and a second pipe port 16. When the inlet pipe port 13 is connected to the first pipe port 15 through the first valve cavity 11, the outlet pipe port 14 is connected to the second pipe port 16; when the inlet pipe port 13 is connected to the second pipe port 16 through the first valve cavity 11, the outlet pipe port 14 is connected to the first pipe port 15. Specifically, the inlet pipe port 13 is used to connect to the high-pressure pipeline, and the outlet pipe port 14 is used to connect to the low-pressure pipeline. The pilot valve 20 has a second valve cavity 21 and a second valve core 22. The second valve core 22 is arranged in the second valve cavity 21. The pilot valve 20 has a pilot valve inlet 23, a pilot valve outlet 24, a third pipe port 25 and a fourth pipe port 26. The pilot valve outlet 24 is connected to the air outlet pipe port 14 through the first capillary 31. The pilot valve inlet 23 is connected to the air inlet pipe port 13. The third pipe port 25 and the fourth pipe port 26 are respectively connected to the main valve 10. The first check valve 41 is arranged between the pilot valve outlet 24 and the air outlet pipe port 14. The first check valve 41 is used to control the flow direction of the fluid between the pilot valve outlet 24 and the air outlet pipe port 14. The first check valve 41 is used to prevent the fluid from flowing from the air outlet pipe port 14 to the pilot valve outlet 24. The first check valve 41 allows the fluid to flow from the pilot valve outlet 24 to the air outlet pipe port 14.

[0028] Through the device provided by the present application, the four-way reversing valve includes a main valve 10, a pilot valve 20 and a first one-way valve 41, wherein the pilot valve outlet 24 is connected to the air outlet pipe port 14 through a first capillary 31, and the first one-way valve 41 is arranged between the pilot valve outlet 24 and the air outlet pipe port 14, and the first one-way valve 41 is used to control the flow direction of the fluid between the pilot valve outlet 24 and the air outlet pipe port 14. Specifically, the first one-way valve 41 allows the fluid to flow from the pilot valve outlet 24 to the air outlet pipe port 14, and prevents the fluid from flowing in the opposite direction. By setting the first one-way valve 41, when the main valve is filled with gas, the high-pressure gas in the air outlet pipe port 14 will not flow back into the pilot valve outlet 24, so that the pilot valve outlet 24 is still in a low-pressure state, thereby ensuring that the pipe port connected to the pilot valve outlet 24 is in a low-pressure state. Figure 2 In the state shown, the fourth pipe port 26 connected to the pilot valve outlet 24 can be placed in a low pressure state, so that a pressure difference can be ensured on both sides of the first valve core 12, so that the first valve core 12 continues to move to complete the switching operation. The device can ensure the normal switching of the device and avoid the switching failure caused by the cross-flow of air in the main valve. The device has a simple structure, low cost, and is easy to process and manufacture.

[0029] The first one-way valve 41 can be arranged at the connection between the first capillary 31 and the air outlet 14, or at the middle of the first capillary 31, or at the connection between the first capillary 31 and the pilot valve outlet 24. As long as it can prevent the high-pressure gas in the air outlet 14 from returning from the air outlet 14 to the pilot valve outlet 24. The first one-way valve 41 can be an integrally formed structure with the air outlet 14, or an integrally formed structure with the pilot valve outlet 24, so that the parts are integrated together for easy installation. In this embodiment, the first one-way valve 41 is arranged in the middle of the first capillary 31, so that the first one-way valve 41 is easy to install.

[0030] The four-way reversing valve further includes: a second capillary tube 32 and a second one-way valve 42. The second capillary tube 32 is connected to the air inlet port 13 and the pilot valve inlet 23, respectively. The second one-way valve 42 is arranged between the pilot valve inlet 23 and the air inlet port 13, and the second one-way valve 42 is used to control the flow direction of the fluid between the pilot valve inlet 23 and the air inlet port 13. Specifically, the second one-way valve 42 is used to prevent the fluid from flowing from the pilot valve inlet 23 to the air inlet port 13, and the second one-way valve 42 allows the fluid to flow from the air inlet port 13 to the pilot valve inlet 23. By setting the second one-way valve 42, when the main valve 10 is gas-contaminated, the high-pressure gas in the pilot valve 20 will not flow back into the air inlet port 13, so that the pilot valve 20 still has high-pressure gas, and then it can be ensured that the main valve 10 connected with the pilot valve 20 has high-pressure gas inside, so that the first valve core 12 can continue to be driven to move by the high-pressure gas to complete the reversing operation.

[0031] By setting the first one-way valve 41, it can be ensured that the low-pressure side of the first valve core 12 is in a low-pressure state. By setting the second one-way valve 42, it can be ensured that the high-pressure side of the first valve core 12 is in a high-pressure state. This can further ensure the normal switching of the device and avoid the switching failure caused by air leakage in the main valve 10.

[0032] The four-way reversing valve further includes a pressure storage portion 50, which is disposed on the second capillary tube 32 and is disposed downstream of the second one-way valve 42. By providing the pressure storage portion 50, high-pressure gas can be stored in the pressure storage portion 50. When the pressure at the air inlet port 13 decreases, the high-pressure gas pre-stored in the pressure storage portion 50 can enter the main valve 10 through the pilot valve 20, so as to further ensure the normal movement of the first valve core 12.

[0033] The pressure storage part 50 and the second one-way valve 42 may be an integral structure or two independent structures. In this embodiment, the four-way reversing valve further includes a pressure storage cylinder, which is disposed on the second capillary 32 and is located downstream of the second one-way valve 42. The pressure storage cylinder has a pressure storage cavity, and the pressure storage cylinder forms the pressure storage part 50. By providing the second one-way valve 42 and the pressure storage cylinder which are independent of each other, installation and maintenance can be facilitated, and the structure is simple and the cost is low.

[0034] Of course, the pressure storage part 50 and the second one-way valve 42 can also be set as an integrated structure. Specifically, the second one-way valve 42 includes: a valve body and a third valve core. The valve body has a pressure storage cavity, and the pressure storage cavity forms the pressure storage part 50. The third valve core is arranged in the pressure storage cavity. Through this device, the one-way function can be realized while having the ability to store gas.

[0035] Among them, the four-way reversing valve of the present application can be a slider type reversing valve, or a piston type large capacity reversing valve. In this embodiment, the four-way reversing valve is a slider type reversing valve. Specifically, the first valve core 12 includes two pistons, a connecting rod and a slider. The two pistons are arranged at intervals. The two pistons separate the main valve 10 into a mutually independent first compartment, a first valve chamber 11 and a second compartment. The connecting rod is connected to the two pistons respectively, and the slider is connected to the connecting rod, and the slider is located between the two pistons. The third pipe port is connected to the first compartment, and the fourth pipe port is connected to the second compartment. By controlling the movement of the second valve core 22 in the pilot valve 20, the high-pressure gas in the pilot valve 20 can be controlled to flow into the first compartment or the second compartment. When the high-pressure gas flows into the first compartment, the piston on the left side of the figure can be pushed to move to the right, and then the slider can be moved to the right. After the slider moves into place, the high-pressure gas flowing into the intake pipe port 13 can pass through the first valve chamber 11 and then flow out from the first pipe port 15; when the high-pressure gas flows into the second compartment, the piston on the right side of the figure can be pushed to move to the left, and then the slider can be moved to the left. After the slider moves into place, the high-pressure gas flowing into the intake pipe port 13 can pass through the first valve chamber 11 and then flow out from the second pipe port 16.

[0036] The four-way reversing valve further includes a third capillary tube 33 and a fourth capillary tube 34. Specifically, the third capillary tube 33 is respectively connected to the first compartment and the third pipe opening 25, and the fourth capillary tube 34 is respectively connected to the second compartment and the fourth pipe opening 26. The pilot valve 20 is connected to the main valve 10 through the capillary tube, and the structure is simple and easy to connect.

[0037] The four-way reversing valve provided in the present application has a simple structure and low cost. By installing a one-way valve, the problem of switching failure of the existing four-way valve due to cross-flow during switching can be solved, thereby ensuring the normal operation of the four-way reversing valve and extending the service life of the device.

[0038] It should be noted that the terms used herein are only for describing specific embodiments and are 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 also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0039] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0040] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0041] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. 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 described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0042] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A four-way reversing valve, characterized in that: The four-way reversing valve comprises: A main valve (10) comprises a first valve cavity (11) and a first valve core (12), wherein the first valve core (12) is arranged in the first valve cavity (11), and the main valve (10) is provided with an air inlet (13), an air outlet (14), a first pipe port (15) and a second pipe port (16), wherein when the air inlet (13) is connected to the first pipe port (15) through the first valve cavity (11), the air outlet (14) is connected to the second pipe port (16); when the air inlet (13) is connected to the second pipe port (16) through the first valve cavity (11), the air outlet (14) is connected to the first pipe port (15), wherein the air inlet (13) is used to be connected to a high-pressure pipeline, and the air outlet (14) is used to be connected to a low-pressure pipeline; A pilot valve (20) having a second valve cavity (21) and a second valve core (22), wherein the second valve core (22) is arranged in the second valve cavity (21), the pilot valve (20) having a pilot valve inlet (23), a pilot valve outlet (24), a third pipe port (25) and a fourth pipe port (26), wherein the pilot valve outlet (24) is connected to the air outlet pipe port (14) via a first capillary tube (31), the pilot valve inlet (23) is connected to the air inlet pipe port (13), and the third pipe port (25) and the fourth pipe port (26) are respectively connected to the main valve (10); A first one-way valve (41) is arranged between the pilot valve outlet (24) and the air outlet pipe (14), and the first one-way valve (41) is used to control the flow of fluid from the pilot valve outlet (24) to the air outlet pipe (14).

2. The four-way reversing valve according to claim 1, characterized in that: The first one-way valve (41) is arranged at the connection between the first capillary tube (31) and the air outlet pipe port (14).

3. The four-way reversing valve according to claim 1, characterized in that: The first one-way valve (41) is arranged in the middle of the first capillary tube (31).

4. The four-way reversing valve according to claim 1, characterized in that: The first one-way valve (41) is arranged at the connection between the first capillary tube (31) and the pilot valve outlet (24).

5. The four-way reversing valve according to claim 1, characterized in that: The four-way reversing valve also includes: a second capillary tube (32), the second capillary tube (32) being respectively connected to the air inlet port (13) and the pilot valve inlet (23); The second one-way valve (42) is arranged between the pilot valve inlet (23) and the air inlet pipe port (13), and the second one-way valve (42) is used to control the flow of fluid from the air inlet pipe port (13) to the pilot valve inlet (23).

6. The four-way reversing valve according to claim 5, characterized in that: The four-way reversing valve also includes: The pressure storage portion (50) is arranged on the second capillary tube (32) and is located downstream of the second one-way valve (42).

7. The four-way reversing valve according to claim 6, characterized in that: The second one-way valve (42) comprises: The valve body has a pressure storage chamber, wherein the pressure storage chamber forms the pressure storage portion (50); The third valve core is arranged in the pressure storage chamber.

8. The four-way reversing valve according to claim 6, characterized in that: The four-way reversing valve also includes: A pressure storage cylinder is arranged on the second capillary tube (32) and is located downstream of the second one-way valve (42). The pressure storage cylinder has a pressure storage cavity and forms the pressure storage portion (50).

9. The four-way reversing valve according to claim 1, characterized in that: The first valve core (12) comprises two pistons, a connecting rod and a slider. The two pistons are arranged at intervals. The two pistons separate the main valve (10) into a first compartment, the first valve compartment (11) and a second compartment which are independent of each other. The connecting rod is connected to the two pistons respectively. The slider is connected to the connecting rod and is located between the two pistons. The slider is used to adjust the connection and disconnection of the air outlet pipe port (14) with the first pipe port (15) or with the second pipe port (16).

10. The four-way reversing valve according to claim 9, characterized in that: The four-way reversing valve also includes: a third capillary tube (33), the third capillary tube (33) being connected to the first compartment and the third tube opening (25) respectively; A fourth capillary tube (34), wherein the fourth capillary tube (34) is respectively connected to the second compartment and the fourth tube opening (26).

11. The four-way reversing valve according to claim 1, characterized in that: The first one-way valve (41) and the air outlet pipe (14) or the pilot valve outlet (24) are integrally formed structures.

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