Guide valve assembly and switching valve with same

Abstract

The utility model provides a pilot valve assembly and a switching valve with the pilot valve assembly, and the pilot valve assembly comprises a pilot valve body which is provided with a first cavity and an exhaust port, and the exhaust port is communicated with the first cavity; the first capillary tube comprises a first air inlet and a first air outlet, and the first air inlet is communicated with the exhaust port; the exhaust pipe is fixed on the outer side of the pilot valve body, the exhaust pipe comprises a second air inlet, the second air inlet is communicated with the first air outlet, and the exhaust pipe is communicated with the first cavity through a first capillary tube. By means of the technical scheme, the problems that in the prior art, a pilot valve is large in size and complex in machining can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of switching valves, in particular to a pilot valve assembly and a switching valve having the pilot valve assembly. Background Art

[0002] At present, the reversing valve on the existing air conditioning system is a four-way valve, and the S pipe on the main valve is connected to the S capillary on the pilot valve. The S connecting pipe connected to the compressor suction port is cancelled on the three-way reversing valve, resulting in the S capillary of the pilot valve needing to be connected to the compressor suction port through a separately set exhaust pipe.

[0003] In the existing three-way reversing valve, a cavity is set on one side of the pilot valve, one end of the exhaust pipe is connected to the cavity, and the S capillary on the pilot valve is inserted into the cavity of the pilot valve, and the S capillary flows through the cavity with the exhaust pipe. However, this requires designing a channel on the pilot valve to form a cavity, setting a step hole matching the exhaust pipe in the channel, and designing a capillary hole flow channel. After three processing steps, the entire pilot valve is increased in size, the material cost is high, and the processing technology is complicated. Utility Model Content

[0004] The utility model provides a pilot valve assembly and a switching valve having the same, so as to solve the problems of large size and complicated processing of the pilot valve in the prior art.

[0005] According to one aspect of the utility model, a pilot valve assembly is provided, which includes: a pilot valve body, having a first cavity and an exhaust port, the exhaust port being connected to the first cavity; a first capillary tube, including a first air inlet and a first air outlet, the first air inlet being connected to the exhaust port; an exhaust pipe, fixed to the outside of the pilot valve body, the exhaust pipe including a second air inlet, the second air inlet being connected to the first air outlet, and the exhaust pipe being connected to the first cavity through the first capillary tube.

[0006] By applying the technical solution of the utility model, the pilot valve body has a first cavity and an exhaust port, the first air inlet of the first capillary is connected to the exhaust port of the pilot valve body, the exhaust pipe is fixed to the outside of the pilot valve body, the exhaust pipe includes a second air inlet, the second air inlet is connected to the first air outlet, and the exhaust pipe is connected to the first cavity through the first capillary. Through the above arrangement, the first air outlet is arranged on the exhaust pipe instead of the pilot valve body, so there is no need to process a capillary hole in the pilot valve body for the first capillary to connect and exhaust, thereby simplifying the structure of the pilot valve assembly, avoiding the problem of difficult processing caused by the large size or complex structure of the pilot valve body, and saving processing and maintenance costs.

[0007] Furthermore, a fixing part is arranged on the end of the pilot valve body arranged in the axial direction, and the exhaust pipe has a fixed end and a free end arranged opposite to each other, and the fixed end is connected to the fixing part. Through the above arrangement, the exhaust pipe has a simple structure and is easy to process.

[0008] Furthermore, the exhaust pipe further comprises a second air outlet, the second air outlet is located at the free end, and the second air inlet is located on the side wall of the exhaust pipe. Through the above arrangement, the first air outlet is conveniently connected to the second air inlet, and the above structure is simple, which facilitates the processing of the exhaust pipe.

[0009] Furthermore, the fixing part includes a limiting protrusion, which is annularly arranged on the end surface of the pilot valve body, and the fixing end is located inside the annularly arranged limiting protrusion; or, the fixing end is sleeved on the outer periphery of the annularly arranged limiting protrusion. With such an arrangement, the structure of the connecting part is simple, which further simplifies the structure of the pilot valve body, and avoids the problems of difficult processing, inconvenient maintenance, and high maintenance cost caused by the complex structure of the pilot valve body.

[0010] Furthermore, the end surface of the fixed end is in contact with the end of the pilot valve body. Through the above arrangement, the first capillary tube is not arranged on the limiting protrusion, and no additional capillary hole is required on the limiting protrusion, and the capillary tube will not interfere with the fixed end, so that while ensuring the connection strength between the exhaust pipe and the limiting protrusion, it is beneficial to reduce the length of the limiting protrusion along the axial direction of the pilot valve body, reduce materials, and save manufacturing costs.

[0011] Furthermore, the exhaust pipe has a flow channel running through the fixed end and the free end, the second air inlet and the second air outlet are both connected to the flow channel, and the fixed end is sealed and fixed to the pilot valve body. The above arrangement facilitates the processing of the exhaust pipe and can ensure that the fluid in the exhaust pipe is discharged from the second air outlet to avoid leakage of the fluid.

[0012] Furthermore, the extension direction of the exhaust pipe is the same as that of the pilot valve body. The above arrangement can not only reduce the interference between the exhaust pipe and other components during assembly and use, but also further reduce the structural size of the pilot valve assembly, making it easier to carry.

[0013] Furthermore, the exhaust port and the second air inlet are located on the same side of the pilot valve body. Through the above arrangement, when the first capillary tube is used to connect the exhaust pipe with the pilot valve body, it only needs to bend the first air outlet 180 degrees and then insert it into the second air inlet, which can further reduce the spatial volume of the pilot valve assembly and avoid the interference of the first capillary tube with other components.

[0014] Furthermore, the exhaust pipe is welded to the pilot valve body, and / or the first capillary tube is welded to the exhaust pipe. Through the above arrangement, the connection method is simple, the convenience of operation is improved, the connection and disassembly of the exhaust pipe, the pilot valve body and the first capillary tube are convenient, and the welding connection makes the connection between the components more stable.

[0015] Furthermore, the second air inlet is located in the middle of the exhaust pipe. The above arrangement can reduce the length of the first capillary tube and prevent the first capillary tube from being too close to the end of the exhaust pipe away from the pilot valve body, thereby affecting the connection between the exhaust pipe and the external pipe.

[0016] Furthermore, a connecting protrusion is provided in an annular shape on the outer periphery of the second air inlet of the exhaust pipe, and the connecting protrusion is used to connect with the first capillary tube. Through the above arrangement, the connecting protrusion can increase the contact area between the second air inlet and the first air outlet, further improving the stability of the connection between the first capillary tube and the exhaust pipe.

[0017] Furthermore, the pilot valve body includes a pilot valve tube, a valve core assembly and a coil, the pilot valve tube has a first cavity and an exhaust port, the valve core assembly is located in the pilot valve tube, the coil is located at one end of the pilot valve tube, the coil is used to drive the valve core assembly to move, and the exhaust pipe is located at the end of the pilot valve tube away from the coil. Through the above arrangement, the movement position of the valve core assembly is controlled by the coil, thereby controlling the exhaust of the exhaust pipe, and the exhaust pipe is located at the end of the pilot valve tube away from the coil, which can further improve the rationality of the layout of the pilot valve assembly.

[0018] According to another aspect of the present invention, a switching valve is provided, the switching valve comprising a main valve and a pilot valve assembly arranged on the main valve, the pilot valve assembly being the above-mentioned pilot valve assembly. Through the above-mentioned arrangement, the overall structure of the switching valve can be simplified, and processing and assembly are facilitated. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting 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 on the present invention. In the drawings:

[0020] Figure 1 A schematic diagram of the structure of a switching valve provided in an embodiment of the utility model is shown;

[0021] Figure 2 Shows Figure 1 The enlarged view of point A in the middle;

[0022] Figure 3 A cross-sectional view of an exhaust pipe provided by an embodiment of the utility model is shown;

[0023] Figure 4 A schematic diagram of the structure of the pilot valve body provided by an embodiment of the utility model is shown;

[0024] Figure 5 A cross-sectional view of a pilot valve body provided by an embodiment of the utility model is shown.

[0025] The above drawings include the following reference numerals:

[0026] 10. Pilot valve body;

[0027] 11. first cavity; 12. exhaust port;

[0028] 13. Limiting protrusion;

[0029] 14. pilot valve tube; 15. valve core assembly; 16. coil;

[0030] 20. first capillary;

[0031] 21. a first air inlet; 22. a first air outlet;

[0032] 23. Second capillary;

[0033] 24. The third capillary; 25. The fourth capillary;

[0034] 30. Exhaust pipe;

[0035] 31. Second air inlet; 32. Second air outlet;

[0036] 33. Fixed end; 34. Free end;

[0037] 41. First inlet; 42. First outlet; 43. Second outlet;

[0038] 44, first piston chamber; 45, second piston chamber;

[0039] 46. ​​The second cavity. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0041] like Figures 1 to 3As shown, the embodiment of the utility model provides a pilot valve assembly, which includes a pilot valve body 10, a first capillary 20 and an exhaust pipe 30. The pilot valve body 10 has a first cavity 11 and an exhaust port 12, and the exhaust port 12 is connected to the first cavity 11. The first capillary 20 includes a first air inlet 21 and a first air outlet 22, and the first air inlet 21 is connected to the exhaust port 12. The exhaust pipe 30 is fixed to the outside of the pilot valve body 10, and the exhaust pipe 30 includes a second air inlet 31, and the second air inlet 31 is connected to the first air outlet 22. The exhaust pipe 30 is connected to the first cavity 11 through the first capillary 20.

[0042] By applying the technical solution of the utility model, the pilot valve body 10 has a first cavity 11 and an exhaust port 12, the first air inlet 21 of the first capillary tube 20 is communicated with the exhaust port 12 of the pilot valve body 10, the exhaust pipe 30 is fixed on the outside of the pilot valve body 10, the exhaust pipe 30 includes a second air inlet 31, the second air inlet 31 is communicated with the first air outlet 22, and the exhaust pipe 30 is communicated with the first cavity 11 through the first capillary tube 20. Through the above arrangement, the first air outlet 22 is arranged on the exhaust pipe 30 instead of the pilot valve body 10, so that there is no need to process a capillary hole in the pilot valve body 10 for the first capillary tube 20 to connect and exhaust, thereby simplifying the structure of the pilot valve assembly, avoiding the problem of difficult processing caused by the oversize or complex structure of the pilot valve body 10, and saving processing and maintenance costs.

[0043] like Figure 1 and Figure 3 As shown, a fixing portion is provided on the axial end of the pilot valve body 10, and the exhaust pipe 30 has a fixed end 33 and a free end 34 which are arranged opposite to each other, and the fixed end 33 is connected to the fixing portion. With such arrangement, the exhaust pipe 30 has a simple structure and is convenient for processing.

[0044] like Figures 1 to 3 As shown, the exhaust pipe 30 also includes a second air outlet 32, which is located on the free end 34, so that it is convenient for the second air outlet 32 ​​to exhaust, and it is convenient to weld an external pipe at the free end 34 for connection according to actual working conditions. The second air outlet 32 ​​is arranged at the free end 34, and it is also possible to avoid interference with other components when the second air outlet 32 ​​is exhausted. The second air inlet 31 is located on the side wall of the exhaust pipe 30. Through the above arrangement, it is convenient to communicate with the first air outlet 22 and the second air inlet 31, and the above structure is simple, which facilitates the processing of the exhaust pipe 30.

[0045] like Figures 3 to 5As shown, the fixing portion includes a limiting protrusion 13, which is annularly arranged on the end surface of the pilot valve body 10, and the fixing end 33 is located in the annularly arranged limiting protrusion 13. In this way, the exhaust pipe 30 is connected to the pilot valve body 10 through the limiting protrusion 13 on the pilot valve body 10, and the structure of the connecting portion is simple, which further simplifies the structure of the pilot valve body 10, and avoids the problems of difficult processing or inconvenient maintenance and high maintenance cost caused by the complex structure of the pilot valve body 10.

[0046] Furthermore, an annular groove or a circular opening that matches the structure of the fixed end 33 can be provided on the end surface of the limiting protrusion 13, so as to facilitate the connection between the pilot valve body 10 and the exhaust pipe 30, thereby improving the stability of the connection between the limiting protrusion 13 and the fixed end 33. At the same time, the above structure also facilitates the assembly and positioning of the fixed end 33 and the limiting protrusion 13, thereby improving the installation efficiency of the assembly. And the fixed end 33 is located in the limiting protrusion 13, so that the limiting protrusion 13 can also limit and guide the position of the exhaust pipe 30, so as to avoid the exhaust pipe 30 shaking during operation or when connecting the external pipe, which affects the operation or assembly accuracy.

[0047] Specifically, the limiting protrusion 13 can be integrally formed with the pilot valve body 10 by turning or other processing methods, and the above processing method is simple and easy to operate. In addition, the integral forming of the limiting protrusion 13 and the pilot valve body 10 can also improve the structural strength of the pilot valve body 10 and the connecting part.

[0048] In other embodiments of the present application, grooves or openings of different shapes may be processed on the end surface of the limiting protrusion 13 according to the specific structure of the fixed end 33 of the exhaust pipe 30, as long as the exhaust pipe 30 can be fixedly connected to the pilot valve body 10.

[0049] In some embodiments of the present application, the exhaust pipe 30 may also be sleeved on the outer periphery of the limiting protrusion 13 .

[0050] Furthermore, if Figures 1 to 3 As shown, the end face of the fixed end 33 abuts against the end face of the pilot valve body 10. Compared with the prior art in which one end of the first capillary is passed through the limiting protrusion, a capillary hole needs to be additionally provided on the limiting protrusion, so that the fixed end cannot abut against the end face of the pilot valve body. The present application connects the first air outlet 22 on the first capillary 20 with the second air inlet 31 on the exhaust pipe 30 through the above-mentioned arrangement, so that the first capillary 20 is not arranged on the limiting protrusion 13, and there is no need to additionally provide a capillary hole on the limiting protrusion 13. The first capillary 20 will not interfere with the fixed end 33, and the end face of the fixed end 33 can also abut against the end face of the pilot valve body 10, so that while ensuring the connection strength between the exhaust pipe 30 and the limiting protrusion 13, it is beneficial to reduce the length of the limiting protrusion 13 along the axial direction of the pilot valve body 10, reduce materials, and save manufacturing costs.

[0051] like Figure 1 and Figure 3 As shown, the exhaust pipe 30 has a flow channel running through the fixed end 33 and the free end 34, and the second air inlet 31 and the second air outlet 32 ​​are both connected to the flow channel, so that the exhaust pipe 30 is easy to process. The fixed end 33 is sealed and fixed to the pilot valve body 10, so that the fluid in the exhaust pipe 30 can be discharged from the second air outlet 32, and the fluid is prevented from leaking from the connection between the fixed end 33 and the limiting protrusion 13. Among them, a sealing ring can be added between the fixed end 33 and the limiting protrusion 13 to ensure the sealing performance.

[0052] like Figure 1 As shown, the extension direction of the exhaust pipe 30 is the same as the extension direction of the pilot valve body 10. If the extension direction of the exhaust pipe 30 and the extension direction of the pilot valve body 10 have an angle, when the exhaust pipe 30 is long, not only will the spatial volume of the pilot valve assembly be increased, but the exhaust pipe 30 is also prone to interfere with other components. Through the above-mentioned arrangement, the present application can not only reduce the interference of the exhaust pipe 30 with other components during assembly and use, but also improve the flexibility of installation and disassembly of the exhaust pipe 30 and the pilot valve body 10 and the convenience of operation, and can further reduce the structural size of the pilot valve assembly, making it easier to process and transport.

[0053] Among them, the exhaust port 12 and the second air inlet 31 are located on the same side of the pilot valve body 10. If the second air inlet 31 and the exhaust port 12 are not on the same side, the extension direction of the first capillary tube 20 has an angle with the extension direction of the pilot valve body 10, which will increase the spatial volume of the pilot valve assembly. Through the above arrangement, when the first capillary tube 20 connects the exhaust pipe 30 with the pilot valve body 10, it is only necessary to bend the first air outlet 22 180° and then insert it into the second air inlet 31. In this way, the extension direction of the first capillary tube 20 is still in the same plane as the extension direction of the pilot valve body 10, which can further reduce the spatial volume of the pilot valve assembly and avoid the interference of the first capillary tube 20 with other components.

[0054] Optionally, the exhaust pipe 30 is welded to the pilot valve body 10, and the connection method between the first capillary tube 20 and the exhaust pipe 30 is not limited, and fastener connection, interference fit and other connection methods can be used. Alternatively, the first capillary tube 20 is welded to the exhaust pipe 30, and the connection method between the exhaust pipe 30 and the pilot valve body 10 is not limited, and a tight fit assembly or a fixed connection by fasteners can be used. In this embodiment, the exhaust pipe 30 is welded to the pilot valve body 10, and the first capillary tube 20 is welded to the exhaust pipe 30. Through the above arrangement, the connection method is simple, the convenience of operation is improved, the connection between the exhaust pipe 30 and the pilot valve body 10 and the first capillary tube 20 is convenient, and the welding connection makes the connection between the components more stable.

[0055] Specifically, the second air inlet 31 is located in the middle of the exhaust pipe 30. Through the above arrangement, compared with the second air inlet 31 being located at the end of the exhaust pipe 30 close to the pilot valve body 10, the design of the present application can avoid excessive bending of the first capillary 20, thereby reducing fatigue damage or breakage of the first capillary 20. Compared with the second air inlet 31 being located at the end of the exhaust pipe 30 away from the pilot valve body 10, the design of the present application can reduce the length of the first capillary 20 and avoid the first capillary 20 and the end of the exhaust pipe 30 away from the pilot valve body 10 being too close to each other, which affects the connection between the exhaust pipe 30 and the external pipe.

[0056] In the embodiment of the present application, a connecting protrusion is provided in an annular shape on the outer periphery of the second air inlet 31 of the exhaust pipe 30, and the connecting protrusion is used to connect with the first capillary tube 20. Through the above arrangement, the connecting protrusion can increase the contact area between the second air inlet 31 and the first air outlet 22, further improving the stability of the connection between the first capillary tube 20 and the exhaust pipe 30.

[0057] Specifically, the end of the first capillary located at the first air outlet 22 may be located inside the connecting protrusion or at the periphery of the connecting protrusion.

[0058] The pilot valve body 10 includes a pilot valve tube 14, a valve core assembly 15 and a coil 16. The pilot valve tube 14 has a first cavity 11, an exhaust port 12 and two switching ports. The exhaust port 12 is located between the two switching ports. The valve core assembly 15 is located in the pilot valve tube 14. The coil 16 is located at one end of the pilot valve tube 14. The coil 16 is used to drive the valve core assembly 15 to move. The exhaust pipe 30 is located at the end of the pilot valve tube 14 away from the coil 16. Through the above arrangement, the movement position of the valve core assembly 15 is controlled by the coil 16, thereby controlling the exhaust port 12 to be connected to one of the switching ports, the first cavity 11 to be connected to the other switching port, and the exhaust pipe 30 is located at the end of the pilot valve tube 14 away from the coil 16, which can further improve the rationality of the layout of the pilot valve assembly.

[0059] like Figure 1 As shown, the embodiment of the utility model also provides a switching valve, which includes a main valve and a pilot valve assembly arranged on the main valve, and the pilot valve assembly is the pilot valve assembly mentioned in the above embodiment. Through the above arrangement, the overall structure of the switching valve can be simplified, which is convenient for processing and assembly.

[0060] Specifically, the main valve has a first inlet 41, a first outlet 42 and a second outlet 43 which are arranged relatively, and the main valve also has a connecting chamber. The main valve also includes a piston, and the piston is located in the connecting chamber to separate the connecting chamber into a first piston chamber 44, a second chamber 46 and a second piston chamber 45. The first piston chamber 44 and the second piston chamber 45 are respectively located at the two ends of the connecting chamber, and the first inlet 41, the first outlet 42 and the second outlet 43 are all connected to the second chamber 46. The first inlet 41 is arranged on one side of the main valve, and the first outlet 42 and the second outlet 43 are arranged on the other side of the main valve.

[0061] Furthermore, the pilot valve assembly further includes a second capillary 23, a third capillary 24 and a fourth capillary 25. The second capillary 23 is used to connect the first cavity 11 with the first inlet 41, the third capillary 24 is used to connect the first piston cavity 44 with a switching port, and the fourth capillary 25 is used to connect the second piston cavity 45 with another switching port. In this configuration, when the pilot valve body drives the valve core assembly 15 to reciprocate in the first cavity 11 through the coil 16, the third capillary 24 and the fourth capillary 25 can drive the piston to reciprocate in the connecting cavity, thereby switching the connection between the first inlet 41 and the first outlet 42 or the second outlet 43, so as to complete the switching and control of the flow path of the fluid in the switching valve.

[0062] 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.

[0063] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. 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, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the 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, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0064] In the description of the present utility model, it needs to be understood 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, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0065] 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.

[0066] 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 utility model.

[0067] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A pilot valve assembly, characterized in that: The pilot valve assembly comprises: A pilot valve body (10) having a first cavity (11) and an exhaust port (12), wherein the exhaust port (12) is in communication with the first cavity (11); A first capillary tube (20), comprising a first air inlet (21) and a first air outlet (22), wherein the first air inlet (21) is connected to the air outlet (12); An exhaust pipe (30) is fixed on the outside of the pilot valve body (10), the exhaust pipe (30) comprises a second air inlet (31), the second air inlet (31) is connected to the first air outlet (22), and the exhaust pipe (30) is connected to the first cavity (11) via the first capillary (20).

2. The pilot valve assembly according to claim 1, characterized in that: A fixing portion is provided on an axially arranged end of the pilot valve body (10); the exhaust pipe (30) has a fixed end (33) and a free end (34) arranged opposite to each other; the fixed end (33) is connected to the fixing portion.

3. The pilot valve assembly according to claim 2, characterized in that: The exhaust pipe (30) further comprises a second air outlet (32), wherein the second air outlet (32) is located at the free end (34), and the second air inlet (31) is located on the side wall of the exhaust pipe (30).

4. The pilot valve assembly according to claim 2, characterized in that: The fixing portion comprises a limiting protrusion (13), the limiting protrusion (13) is arranged in an annular shape on the end surface of the pilot valve body (10), and the fixing end (33) is located inside the limiting protrusion (13) arranged in an annular shape; Alternatively, the fixed end (33) is sleeved on the outer circumference of the annular limiting protrusion (13).

5. The pilot valve assembly according to claim 4, characterized in that: The end surface of the fixed end (33) abuts against the end of the pilot valve body (10).

6. The pilot valve assembly according to claim 3, characterized in that: The exhaust pipe (30) has a flow channel running through the fixed end (33) and the free end (34); the second air inlet (31) and the second air outlet (32) are both connected to the flow channel; and the fixed end (33) is sealed and fixed to the pilot valve body (10).

7. The pilot valve assembly according to claim 1, characterized in that: The extension direction of the exhaust pipe (30) is the same as the extension direction of the pilot valve body (10).

8. The pilot valve assembly according to claim 4, characterized in that: The exhaust port (12) and the second air inlet (31) are located on the same side of the pilot valve body (10).

9. The pilot valve assembly according to claim 1, characterized in that: The exhaust pipe (30) is welded to the pilot valve body (10), and / or the first capillary tube (20) is welded to the exhaust pipe (30).

10. The pilot valve assembly according to claim 1, characterized in that: The second air inlet (31) is located in the middle of the exhaust pipe (30).

11. The pilot valve assembly according to claim 1, characterized in that: A connecting protrusion is provided in an annular shape on the outer periphery of the second air inlet (31) of the exhaust pipe (30), and the connecting protrusion is used to be connected to the first capillary tube (20).

12. The pilot valve assembly according to claim 1, characterized in that: The pilot valve body (10) comprises a pilot valve tube (14), a valve core assembly (15) and a coil (16); the pilot valve tube (14) has the first cavity (11) and the exhaust port (12); the valve core assembly (15) is located in the pilot valve tube (14); the coil (16) is located at one end of the pilot valve tube (14); the coil (16) is used to drive the valve core assembly (15) to move; and the exhaust pipe (30) is located at one end of the pilot valve tube (14) away from the coil (16).

13. A switching valve, characterized in that: The switching valve comprises a main valve and a pilot valve assembly arranged on the main valve, and the pilot valve assembly is the pilot valve assembly according to any one of claims 1 to 12.

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