Main valve and reversing valve having the same

Abstract

The present invention provides a main valve and a reversing valve having the same, the main valve comprising: a valve core assembly; a first valve body, the first valve body having a connecting hole and a plurality of pilot valve flow channels, the pilot valve flow channels at least comprising pilot valve flow channel 1, pilot valve flow channel 2 and pilot valve flow channel 3, the plurality of pilot valve flow channels all being connected to the connecting hole; the first valve body further comprising a piston cavity, the valve core assembly being movably disposed in the piston cavity, the two ends of the valve core assembly respectively forming a first chamber and a second chamber with the first valve body, the pilot valve flow channel 1 being connected to the piston cavity, the pilot valve flow channel 2 being connected to the first chamber, and the pilot valve flow channel 3 being connected to the second chamber; the first valve body further comprising a plurality of main valve channels, the main valve channels at least comprising main valve channel 1, main valve channel 2 and main valve channel 3, the plurality of main valve channels all being connected to the piston cavity; the valve core assembly being used to switch the connection between the plurality of main valve channels. This technical solution can solve the problem of the large number of components and difficulty in installation of reversing valves in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of control valves, and in particular to a main valve and a reversing valve having the same. Background Art

[0002] Currently, the existing directional valve body structure primarily consists of a pilot valve, a main valve, and a mounting bracket. The pilot valve and main valve piping are connected via capillary tubes, and the main valve is also welded to the outside. The pilot valve and main valve are riveted together via the pilot valve mounting bracket. This capillary connection in the aforementioned technical solution involves numerous components, making installation difficult. Furthermore, the welded mounting bracket offers poor vibration resistance and is prone to breakage during vehicle movement, resulting in poor sealing. Summary of the Invention

[0003] The present invention provides a main valve and a reversing valve having the same, so as to solve the problem that the reversing valve in the prior art has many parts and components and is difficult to install.

[0004] According to one aspect of the present invention, a main valve is provided, which includes: a valve core assembly; a first valve body, the first valve body having a connecting hole and a plurality of pilot valve channels, the pilot valve channels at least including pilot valve channel one, pilot valve channel two and pilot valve channel three, and the plurality of pilot valve channels are all connected to the connecting hole; the first valve body also has a piston cavity, the valve core assembly is movably arranged in the piston cavity, the two ends of the valve core assembly respectively form a first chamber and a second chamber with the first valve body, the pilot valve channel one is connected to the piston cavity, the pilot valve channel two is connected to the first chamber, and the pilot valve channel three is connected to the second chamber; the first valve body also has a plurality of main valve channels, the main valve channels at least including main valve channel one, main valve channel two and main valve channel three, and the plurality of main valve channels are all connected to the piston cavity; the valve core assembly is used to switch the connection between the plurality of main valve channels.

[0005] Furthermore, the pilot valve flow channel 1 is communicated with the piston chamber through the main valve channel 1.

[0006] Furthermore, the communicating hole includes a first hole segment and a second hole segment that are connected in sequence, the first hole segment is used to be connected to the pilot valve, and the plurality of pilot valve flow channels are respectively connected to the second hole segment.

[0007] Furthermore, the first hole section has a threaded structure, and the first hole section is connected to the pilot valve via the threaded structure.

[0008] Furthermore, the valve core assembly includes: a first slider, which is used to switch the connection between multiple main valve channels; a piston, which is located on both sides of the first slider, and the piston is connected to the first slider through a first connecting rod, and the first slider moves synchronously with the piston in the piston cavity.

[0009] Furthermore, the first valve body includes: a box body, the piston cavity runs through both sides of the box body, and multiple pilot valve channels and connecting holes are arranged on the box body; end covers are located on both sides of the box body, and the end covers are used to block the piston cavity.

[0010] Furthermore, the box body has a front end face and a rear end face that are relatively arranged, the connection port of part of the main valve channel is located on the front end face of the box body, the connection port of part of the main valve channel is located on the rear end face of the box body, and the communicating hole is located on the upper end face of the box body.

[0011] According to another aspect of the present invention, a reversing valve is provided, which includes: a main valve, which is the main valve provided above; a pilot valve, which includes a second valve body, an electromagnetic assembly and a valve stem assembly, the electromagnetic assembly and the valve stem assembly are arranged on the second valve body, the electromagnetic assembly is arranged on the outside of the second valve body, the valve stem assembly is arranged on the inside of the second valve body, the second valve body is connected to the first valve body, one end of the valve stem assembly extends into the communicating hole, and the electromagnetic assembly is used to control the movement of the valve stem assembly in the communicating hole to achieve switching of the communication between multiple pilot valve flow channels.

[0012] Furthermore, the second valve body is detachably connected to the main valve, and a connection end of the second valve body connected to the main valve is provided with an external thread, and the second valve body is threadably connected to the main valve via the external thread.

[0013] Furthermore, the electromagnetic assembly includes a coil and a core iron, the core iron is movably arranged in the second valve body, and the coil is wrapped around the outside of the second valve body; the valve stem assembly includes a second slider and a second connecting rod, one end of the second connecting rod is connected to the core iron, and the other end of the second connecting rod is connected to the second slider, the second slider is movably arranged in the connecting hole of the main valve, and the second slider is used to switch the connection between multiple pilot valve flow channels.

[0014] Applying the technical solution of the present invention, multiple pilot valve channels and communication holes are provided on the first valve body of the main valve. These channels are connected to the communication holes, with pilot valve channel two communicating with the first chamber and pilot valve channel three communicating with the second chamber. This structure allows the pilot valve channels to replace existing capillaries, reducing the number of components in the device and facilitating installation and fixation. Furthermore, replacing capillaries with pilot valve channels eliminates the need for welding, improving the device's connection stability and extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 shows a top view of a main valve provided according to an embodiment of the present invention;

[0017] Figure 2 Shown Figure 1 Cross-sectional view at AA in the middle (valve core assembly not installed);

[0018] Figure 3 Shown Figure 1 Cross-sectional view at the middle BB (without valve core assembly installed);

[0019] Figure 4 shows a side view of a main valve provided according to an embodiment of the present invention;

[0020] Figure 5 FIG2 shows a top view of a reversing valve provided according to an embodiment of the present invention;

[0021] Figure 6 Shown Figure 5 Cross-sectional view at CC;

[0022] Figure 7 Shown Figure 5 Cross-sectional view at DD in the middle;

[0023] Figure 8 A side view of a reversing valve provided according to an embodiment of the present invention is shown.

[0024] The above drawings include the following reference numerals:

[0025] 11. Pilot valve flow channel D; 12. Pilot valve flow channel S; 13. Pilot valve flow channel E; 14. Pilot valve flow channel C; 15. Connecting hole; 151. First hole section; 152. Second hole section;

[0026] 21. Piston chamber; 22. First chamber; 23. Second chamber;

[0027] 31. Main valve channel D; 32. Main valve channel S; 33. Main valve channel E; 34. Main valve channel C;

[0028] 41. First slider; 42. Piston; 43. First connecting rod;

[0029] 51. Box body; 52. End cover;

[0030] 100, main valve; 200, pilot valve;

[0031] 60. Second valve body;

[0032] 71. Coil; 72. Core iron;

[0033] 81. Second slider; 82. Second connecting rod. DETAILED DESCRIPTION

[0034] The following will be combined with the accompanying 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 embodiments described 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 in no way 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 making creative efforts are within the scope of protection of the present invention.

[0035] The present invention provides a main valve, comprising: a valve core assembly and a first valve body. The first valve body has a connecting hole 15 and multiple pilot valve channels, including at least pilot valve channel 1, pilot valve channel 2, and pilot valve channel 3, all of which are connected to the connecting hole 15. The first valve body also has a piston chamber 21, and the valve core assembly is movably disposed within the piston chamber 21. The two ends of the valve core assembly form a first chamber 22 and a second chamber 23 with the first valve body, respectively. Pilot valve channel 1 is connected to the piston chamber 21, pilot valve channel 2 is connected to the first chamber 22, and pilot valve channel 3 is connected to the second chamber 23. The first valve body also has multiple main valve channels, including at least main valve channel 1, main valve channel 2, and main valve channel 3, all of which are connected to the piston chamber 21. The valve core assembly is used to switch the communication between the multiple main valve channels. The main valve can be used in three-way valves, four-way valves, or other multi-way valves.

[0036] Through the above structure, the pilot valve flow channel can be used to replace the existing capillary tube, reducing the number of parts in the device structure and facilitating installation and fixation; moreover, the pilot valve flow channel is used to replace the capillary tube structure, eliminating the need for welding, thereby improving the connection stability of the device and extending the service life of the device.

[0037] like Figures 1 to 4As shown, this embodiment provides a main valve for a four-way valve, comprising a valve core assembly and a first valve body. The first valve body is provided with a pilot valve channel D11, a pilot valve channel S12, a pilot valve channel E13, a pilot valve channel C14, and a connecting hole 15. The pilot valve channels D11, S12, E13, and C14 are respectively connected to the connecting hole 15. The first valve body is also provided with a piston chamber 21, within which the valve core assembly is movably disposed. The two ends of the valve core assembly and the first valve body respectively form a first chamber 22 and a second chamber 23, each independently of each other. The pilot valve channel E13 is connected to the first chamber 22, and the pilot valve channel C14 is connected to the second chamber 23. The first valve body is also provided with a main valve channel D31, a main valve channel S32, a main valve channel E33, and a main valve channel C34. The pilot valve channel D11 communicates with the main valve channel D31, and the pilot valve channel S12 communicates with the main valve channel S32. The main valve channels D31, S32, E33, and C34 are respectively in communication with the piston chamber 21. The valve core assembly is used to control the communication between the main valve channel S32 and the main valve channel E33 or the main valve channel C34.

[0038] In the above technical solution, pilot valve flow channel D11, pilot valve flow channel S12, pilot valve flow channel E13, pilot valve flow channel C14, and connecting hole 15 are provided on the first valve body of the main valve. Pilot valve flow channel D11, pilot valve flow channel S12, pilot valve flow channel E13, and pilot valve flow channel C14 are respectively connected to connecting hole 15, and pilot valve flow channel D11 is connected to main valve channel D31, pilot valve flow channel S12 is connected to main valve channel S32, pilot valve flow channel E13 is connected to first chamber 22, and pilot valve flow channel C14 is connected to second chamber 23. This structure allows the pilot valve flow channel to replace the existing capillary tube, reducing the number of parts in the device structure and facilitating installation and fixation by workers. Furthermore, by replacing the capillary tube structure with the pilot valve flow channel, welding is eliminated, which improves the connection stability of the device, extends the service life of the device, increases the integration of the main valve, and reduces the space occupied by the device.

[0039] Specifically, the pilot valve flow channel D11 is located on one side of the communicating hole 15, while the pilot valve flow channel S12, the pilot valve flow channel E13, and the pilot valve flow channel C14 are located on the other side of the communicating hole 15. The pilot valve flow channel E13, the pilot valve flow channel S12, and the pilot valve flow channel C14 are arranged sequentially along the axial direction of the communicating hole 15. This arrangement allows for a rational arrangement of the pilot valve flow channels, facilitating the pilot valve's control of the pilot valve flow channels E13, S12, and C14.

[0040] In this embodiment, the communication hole 15 includes a first hole section 151 and a second hole section 152, which are connected in sequence. The first hole section 151 is used to connect to the pilot valve, and the pilot valve flow channel D11, the pilot valve flow channel S12, the pilot valve flow channel E13, and the pilot valve flow channel C14 are respectively connected to the second hole section 152. Specifically, the first hole section 151 and the second hole section 152 are stepped holes, and the aperture of the first hole section 151 is larger than the aperture of the second hole section 152. The first hole section 151 and the second hole section 152 can be coaxial or not. The location of the second hole section 152 is compatible with the structure of the pilot valve, so that the second slider of the pilot valve can control the connection between the pilot valve flow channel S12, the pilot valve flow channel E13, and the pilot valve flow channel C14.

[0041] The first hole section 151 is provided with a threaded structure, and the first hole section 151 is connected to the pilot valve via the threaded structure, so as to facilitate the connection between the two. The threaded structure can improve the connection stability of the two while simplifying the connection structure.

[0042] Specifically, the valve core assembly includes a first slider 41 and a piston 42. The first slider 41 is used to connect the main valve channel S32 with the main valve channel E33 or the main valve channel C34. The piston 42 is located on either side of the first slider 41 and is connected to the first slider 41 by a first connecting rod 43. The first slider 41 and the piston 42 move synchronously within the piston chamber 21.

[0043] The first valve body comprises a housing 51 and end caps 52. The piston chamber 21 extends through both sides of the housing 51. Pilot valve channels D11, S12, E13, and C14, as well as the connecting hole 15, are all provided on the housing 51. End caps 52 are located on both sides of the housing 51 and serve to seal the piston chamber 21. This structure facilitates the manufacture of the first valve body and reduces production costs. The end caps 52 can be connected to the housing 51 via fasteners. To improve sealing, a seal can be provided between the end caps 52 and the housing 51.

[0044] In this embodiment, the housing 51 has a front face and a rear face that are positioned opposite each other. The connection ports for the main valve channel E33 and the main valve channel C34 are located on the front face of the housing 51, while the connection port for the main valve channel D31 is located on the rear face of the housing 51. The communication hole 15 is located on the upper face of the housing 51, and the connection port for the main valve channel S32 is located on the lower face of the housing 51. This structure facilitates the distribution of the various connection ports, facilitating connection to the air conditioning system. Of course, the positions of the connection ports can be adjusted according to connection requirements and are not limited to the positions provided in this embodiment.

[0045] like Figures 5 to 8As shown, another embodiment of the present invention provides a reversing valve, which includes: a main valve 100 and a pilot valve 200. The main valve 100 is the main valve provided in the above embodiment. The pilot valve 200 includes a second valve body 60, an electromagnetic assembly, and a valve stem assembly. The electromagnetic assembly and the valve stem assembly are arranged on the second valve body 60. The electromagnetic assembly is arranged on the outside of the second valve body 60, and the valve stem assembly is arranged on the inside of the second valve body 60. The second valve body 60 is connected to the first valve body, and one end of the valve stem assembly extends into the connecting hole 15. The electromagnetic assembly is used to control the movement of the valve stem assembly in the connecting hole 15 to achieve switching between multiple pilot valve flow channels. Specifically, in this embodiment, the pilot valve flow channel S12 can be controlled to be connected to the pilot valve flow channel E13 or to be connected to the pilot valve flow channel C14.

[0046] This technical solution eliminates the capillary structure connecting the main valve and pilot valve, reducing the number of components. The pilot valve flow path is located on the first valve body, making installation and connection easier. This solution also avoids the problems of loose connections and leaks caused by welding, improving the device's connection stability and extending its service life.

[0047] The second valve body can be detachably or fixedly connected to the main valve. In this embodiment, the second valve body is detachably connected to the main valve. The connection end of the second valve body 60 that connects to the main valve 100 is provided with external threads, and the second valve body 60 is threadedly connected to the main valve 100 via the external threads. This solution has a simple structure and is easy to install and secure. The second valve body 60 includes a valve cover, and the valve stem assembly is inserted into the valve cover. The outer side of the valve cover is provided with external threads, which are used to connect to the connecting hole 15 of the main valve 100. In this embodiment, a sealing ring is also provided between the valve cover and the connecting hole to improve sealing performance.

[0048] The electromagnetic assembly includes a coil 71 and a core iron 72. The core iron 72 is movably disposed within the second valve body 60, and the coil 71 is wrapped around the outside of the second valve body 60. The valve stem assembly includes a second slider 81 and a second connecting rod 82. One end of the second connecting rod 82 is connected to the core iron 72, and the other end of the second connecting rod 82 is connected to the second slider 81. The second slider 81 is movably disposed within the communication hole 15 of the main valve 100 and is used to control the communication between the pilot valve flow channel S12 and the pilot valve flow channel E13 or the pilot valve flow channel C14.

[0049] In order to facilitate understanding of the technical solution of this application, the operation process of the device is described as follows:

[0050] Combine Figure 2 、 Figure 6 and Figure 7As shown, in the main valve 100, main valve channel D31 is connected to the compressor exhaust port (connected to the high-pressure area), main valve channel S32 is connected to the compressor suction port (connected to the low-pressure area), main valve channel E33 is connected to the indoor heat exchanger, and main valve channel C34 is connected to the outdoor heat exchanger. A first slider 41 and a piston 42 are disposed within the piston chamber 21 of the main valve 100. The piston 42 drives the first slider 41 to move within the piston chamber 21.

[0051] Pilot valve channel D11 communicates with main valve channel D31, indicating high pressure within pilot valve channel D11. Pilot valve channel S12 communicates with main valve channel S32, indicating low pressure within pilot valve channel S12. The second slider 81 moves within the communication hole 15 to control the communication between pilot valve channel S12 and either pilot valve channel E13 or pilot valve channel C14. This, in turn, controls whether high pressure is maintained within the first chamber 22 or within the second chamber 23, thereby controlling the movement direction of the first slider 41 and piston 42.

[0052] Specifically, when the heat exchange system requires cooling, coil 71 is energized, and core iron 72 in the inner cavity of second valve body 60 overcomes gravity, driving second slider 81 upward. This connects pilot valve channel E13 with pilot valve channel S12, and pilot valve channel C14 with pilot valve channel D11. This creates a low-pressure zone in first chamber 22 and a high-pressure zone in second chamber 23. This creates a pressure differential between first chamber 22 and second chamber 23, pushing first slider 41 and piston 42 leftward, connecting main valve channel E33 with main valve channel S32, and main valve channel D31 with main valve channel C34. At this point, the refrigerant flow path within the refrigeration system is: compressor exhaust port → main valve channel D31 → piston chamber 21 → main valve channel C34 → outdoor heat exchanger → throttling element → indoor heat exchanger → main valve channel E33 → inner cavity of first slider 41 → main valve channel S32 → compressor intake port. The heat exchange system is now in cooling operation.

[0053] When the heat exchange system needs to heat, the coil 71 is de-energized, and the core iron 72 and the second slider 81 in the inner cavity of the second valve body 60 move to the lower position under the action of gravity, so that the pilot valve flow channel C14 and the pilot valve flow channel S12 are connected, and the pilot valve flow channel E13 and the pilot valve flow channel D11 are connected. As a result, the first chamber 22 is in the high-pressure area, and the second chamber 23 is in the low-pressure area. A pressure difference is formed between the first chamber 22 and the second chamber 23, which pushes the first slider 41 and the piston 42 to the right, so that the main valve channel C34 and the main valve channel S32 are connected, and the main valve channel D31 and the main valve channel E33 are connected. At this time, the flow path of the refrigerant in the heat exchange system is: compressor exhaust port → main valve channel D31 → piston chamber 21 → main valve channel E33 → indoor heat exchanger → throttling element → outdoor heat exchanger → main valve channel C34 → inner cavity of the first slider 41 → main valve channel S32 → compressor suction port, and the heat exchange system is in the heating working state.

[0054] Through the embodiments provided in this application, the number of parts in the device structure is reduced, making it easier for workers to install and fix it; and, the capillary structure is replaced by a guide valve flow channel, eliminating the need for welding, thereby improving the connection stability of the device, extending the service life of the device, improving the integration of the main valve, and reducing the space occupied by the device.

[0055] 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, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0056] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values ​​set forth in these embodiments 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 drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0057] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying 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 device or element 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 outline of each component itself.

[0058] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. 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 figures. For example, if the device in the 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.

[0059] 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. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0060] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A main valve, characterized in that: The main valve comprises: Valve core assembly; a first valve body, the first valve body having a communication hole (15) and a plurality of pilot valve flow channels, the pilot valve flow channels at least comprising a first pilot valve flow channel, a second pilot valve flow channel, and a third pilot valve flow channel, the plurality of pilot valve flow channels being arranged inside the first valve body, and the plurality of pilot valve flow channels being in communication with the communication hole (15); The first valve body further comprises a piston cavity (21), the valve core assembly is movably arranged in the piston cavity (21), the two ends of the valve core assembly respectively form a first cavity (22) and a second cavity (23) with the first valve body, the pilot valve flow channel 1 is in communication with the piston cavity (21), the pilot valve flow channel 2 is in communication with the first cavity (22), and the pilot valve flow channel 3 is in communication with the second cavity (23); The first valve body further has a plurality of main valve channels, the main valve channels at least including a main valve channel 1, a main valve channel 2, and a main valve channel 3, and the plurality of main valve channels are all in communication with the piston chamber (21); The valve core assembly is used to switch the communication between the plurality of main valve channels; The communicating hole (15) comprises a first hole section (151) and a second hole section (152) which are connected in sequence, the first hole section (151) being used to connect to the pilot valve, and a plurality of pilot valve flow channels being respectively connected to the second hole section (152); the first hole section (151) and the second hole section (152) are stepped holes, and the aperture of the first hole section (151) is larger than the aperture of the second hole section (152); The first hole section (151) has a threaded structure, and the first hole section (151) is connected to the pilot valve via the threaded structure; The first valve body includes: A box body (51), the piston chamber (21) passes through both sides of the box body (51), and the plurality of pilot valve flow channels and the communication holes (15) are all provided on the box body (51); End covers (52) are located on both sides of the box body (51), and the end covers (52) are used to seal the piston cavity (21).

2. The main valve according to claim 1, characterized in that The pilot valve flow channel 1 is connected to the piston chamber (21) through the main valve channel 1.

3. The main valve according to claim 1, characterized in that The valve core assembly includes: a first slider (41), the first slider (41) being used to switch the communication between the plurality of main valve channels; The piston (42) is located on both sides of the first slider (41). The piston (42) and the first slider (41) are connected via a first connecting rod (43). The first slider (41) and the piston (42) move synchronously in the piston cavity (21).

4. The main valve according to claim 1, characterized in that The box body (51) has a front end face and a rear end face that are arranged opposite to each other, a portion of the connection ports of the main valve channel are located on the front end face of the box body (51), a portion of the connection ports of the main valve channel are located on the rear end face of the box body (51), and the communicating hole (15) is located on the upper end face of the box body (51).

5. A reversing valve, characterized in that: The reversing valve comprises: A main valve (100), wherein the main valve (100) is the main valve according to any one of claims 1 to 4; A pilot valve (200), the pilot valve (200) includes a second valve body (60), an electromagnetic assembly and a valve stem assembly, the electromagnetic assembly and the valve stem assembly are arranged on the second valve body (60), the electromagnetic assembly is arranged on the outside of the second valve body (60), the valve stem assembly is arranged on the inside of the second valve body (60), the second valve body (60) is connected to the first valve body, one end of the valve stem assembly extends into the connecting hole (15), and the electromagnetic assembly is used to control the movement of the valve stem assembly in the connecting hole (15) to achieve switching between multiple pilot valve flow channels.

6. The reversing valve according to claim 5, characterized in that: The second valve body (60) is detachably connected to the main valve (100); an external thread is provided at a connection end of the second valve body (60) connected to the main valve (100); and the second valve body (60) is threadedly connected to the main valve (100) via the external thread.

7. The reversing valve according to claim 5, characterized in that: The electromagnetic assembly comprises a coil (71) and a core iron (72), wherein the core iron (72) is movably arranged in the second valve body (60), and the coil (71) is wrapped around the outside of the second valve body (60); The valve stem assembly includes a second slider (81) and a second connecting rod (82), one end of the second connecting rod (82) is connected to the core iron (72), and the other end of the second connecting rod (82) is connected to the second slider (81), and the second slider (81) is movably arranged in the connecting hole (15) of the main valve (100), and the second slider (81) is used to switch the connection between multiple pilot valve flow channels.

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