Reversing valve

Abstract

The utility model relates to the technical field of reversing valves, in particular to a reversing valve. The reversing valve comprises a main valve body and a main valve seat, a mounting hole is formed in the side wall of the main valve body and communicated with the interior and the exterior of the main valve body, the inner wall of the mounting hole comprises two first connecting faces, the two first connecting faces are arranged in the circumferential direction of the main valve body, an included angle is formed between the two first connecting faces, and the two first connecting faces are arranged in the radial direction of the main valve body. The distance between the two first connecting faces is gradually increased in the direction from the interior of the main valve body to the exterior of the main valve body. The main valve seat is installed in the installation hole, the outer wall of the main valve seat comprises two second connecting faces, and the two second connecting faces are at least partially connected with the two first connecting faces in an abutting mode and fixed to the two first connecting faces in a welded mode. According to the reversing valve, the problem that the machining cost is high when an existing reversing valve is machined is solved.

Description

Technical Field

[0001] The present application relates to the technical field of reversing valves, and in particular to a reversing valve. Background Art

[0002] Reversing valves are often used in air-conditioning systems to switch the flow direction of the refrigerant, thereby switching between cooling and heating modes. In related technologies, the reversing valve includes a main valve body and a main valve seat. Both the main valve body and the main valve seat are provided with corresponding pipe holes. Currently, during processing, the main valve seat is often placed in the main valve body so that the arc surface of the main valve seat fits with the inner wall of the main valve body, and the pipe holes of the two are aligned. After that, the pipe is inserted into the pipe hole and fixed by welding. During this process, the welding ring is heated and melted, and the melted welding ring penetrates into the gap between the pipe, the main valve seat and the main valve body through capillary action to achieve connection. However, the above assembly method is complicated to operate and takes a long time to assemble, which greatly increases the processing cost of the reversing valve. Utility Model Content

[0003] Based on this, it is necessary to provide a reversing valve to solve the problem of high processing cost during the processing of existing reversing valves.

[0004] The present application provides a reversing valve, which includes a main valve body and a main valve seat. A mounting hole is opened on the side wall of the main valve body, and the mounting hole connects the interior and exterior of the main valve body. In addition, the inner wall of the mounting hole includes two first connecting surfaces, and the two first connecting surfaces are arranged along the circumference of the main valve body. The two first connecting surfaces are set at an angle, and along the radial direction of the main valve body, the spacing between the two first connecting surfaces gradually increases from the interior to the exterior of the main valve body; the main valve seat is installed in the mounting hole, and the outer wall of the main valve seat includes two second connecting surfaces, and the two second connecting surfaces are respectively at least partially abutted against the two first connecting surfaces and welded fixed.

[0005] In one embodiment, the angle formed by the two first connecting surfaces is α, and the angle formed by the two second connecting surfaces is β, wherein β≥α.

[0006] In one embodiment, 0≤β-α≤2°.

[0007] In one embodiment, the central axis of the main valve body is located at the intersection of the planes where the two first connecting surfaces are located.

[0008] In one embodiment, the inner wall of the mounting hole also includes two third connecting surfaces, which are arranged along the axial direction of the main valve body and are both set perpendicular to the central axis of the main valve body; wherein, both ends of each of the third connecting surfaces are respectively connected to the two first connecting surfaces, and the third connecting surfaces are welded and fixed to the outer wall of the main valve seat.

[0009] In one embodiment, the outer wall of the main valve seat is further provided with an arc surface, which is provided between the two second connecting surfaces and is respectively connected to the two second connecting surfaces. Along the radial direction of the main valve body, the arc surface is not lower than the outer side wall of the main valve body.

[0010] In one embodiment, the radius of the arc surface is R, and the outer diameter of the main valve body is D, wherein 0≤2R-D≤2mm.

[0011] In one embodiment, a sealing plane is further provided on the outer wall of the main valve seat. The sealing plane is provided on a side of the second connecting surface away from the arc surface, and both ends of the sealing plane are respectively connected to the two second connecting surfaces.

[0012] In one embodiment, the outer wall of the main valve seat is further provided with an extension surface, which is provided between the sealing plane and the second connecting surface and is respectively connected to the sealing plane and the second connecting surface; wherein the two extension surfaces are provided in parallel.

[0013] In one embodiment, the main valve seat and the main valve body are fixed by laser welding.

[0014] Compared to the prior art, the reversing valve provided in this application has a mounting hole formed on the main valve body, with two first connecting surfaces on the mounting hole arranged at an angle. Simultaneously, the two second connecting surfaces on the main valve seat are also arranged at an angle. Thus, when the main valve seat is inserted into the main valve body through the mounting hole, the abutment of the first connecting surfaces and the second connecting surfaces limits the relative position of the main valve seat and the main valve body, preventing the main valve seat from being inserted too deeply into the main valve body and improving the reliability of the connection between the two. Furthermore, the connecting pipe on the reversing valve does not need to be connected to both the main valve seat and the main valve body at the same time, simplifying installation and reducing installation precision requirements, thereby reducing the processing cost of the reversing valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 A schematic structural diagram of a main valve body according to an embodiment of the present application;

[0017] Figure 2 An exploded cross-sectional view of the main valve body and main valve seat in cooperation with each other according to an embodiment of the present application;

[0018] Figure 3 A schematic structural diagram of a main valve seat according to an embodiment of the present application;

[0019] Figure 4 for Figure 3 A side view of the main valve seat is shown;

[0020] Figure 5 for Figure 4 The enlarged view of point I in the middle;

[0021] Figure 6 A schematic structural diagram of a main valve seat according to another embodiment of the present application;

[0022] Figure 7 for Figure 6 A side view of the main valve seat is shown;

[0023] Figure 8 for Figure 7 Enlarged view of position II in the middle;

[0024] Figure 9 A schematic structural diagram of a reversing valve according to an embodiment of the present application;

[0025] Figure 10 A side view of a reversing valve according to an embodiment of the present application.

[0026] The symbols in the figure mean the following:

[0027] 100. Reversing valve; 10. Main valve body; 101. Mounting hole; 102. First connecting surface; 103. Third connecting surface; 11. E short capillary tube; 12. C short capillary tube; 20. Main valve seat; 201. Second connecting surface; 202. Arc surface; 203. Sealing plane; 204. Transition arc surface; 205. Extension surface; 30. E connecting pipe; 31. E sleeve; 40. S connecting pipe; 41. S sleeve; 42. S short capillary tube; 50. C connecting pipe; 51. C sleeve; 60. D connecting pipe; 61. D sleeve; 62. D short capillary tube. DETAILED DESCRIPTION

[0028] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0029] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0031] In this application, unless otherwise expressly specified or limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or that the first feature and the second feature are indirectly in contact through an intermediate medium. Furthermore, a first feature being “above,” “above,” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below,” “below,” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0032] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the relevant listed items.

[0033] Reversing valves are often used in air-conditioning systems to switch the flow direction of the refrigerant, thereby switching between cooling and heating modes. In related technologies, the reversing valve includes a main valve body and a main valve seat. Both the main valve body and the main valve seat are provided with corresponding pipe holes. Currently, during processing, the main valve seat is often placed in the main valve body so that the arc surface of the main valve seat fits with the inner wall of the main valve body, and the pipe holes of the two are aligned. After that, the pipe is inserted into the pipe hole and fixed by welding. During this process, the welding ring is heated and melted, and the melted welding ring penetrates into the gap between the pipe, the main valve seat and the main valve body through capillary action to achieve connection. However, the above assembly method is complicated to operate and takes a long time to assemble, which greatly increases the processing cost of the reversing valve.

[0034] See also Figures 1-10 To address the high processing costs associated with existing directional control valves, the present application provides a directional control valve 100. The directional control valve 100 includes a main valve body 10 and a main valve seat 20. A mounting hole 101 is defined in the sidewall of the main valve body 10, connecting the interior and exterior of the main valve body 10. Furthermore, the inner wall of the mounting hole 101 includes two first connecting surfaces 102. The two first connecting surfaces 102 are arranged circumferentially around the main valve body 10 and are disposed at an angle. Along the radial direction of the main valve body 10, the spacing between the two first connecting surfaces 102 gradually increases from the interior to the exterior of the main valve body 10. The main valve seat 20 is mounted within the mounting hole 101. The outer wall of the main valve seat 20 includes two second connecting surfaces 201, which at least partially abut and are welded to the two first connecting surfaces 102.

[0035] It is understood that the present application provides a mounting hole 101 on the main valve body 10, and the two first connecting surfaces 102 on the mounting hole 101 are arranged at an angle. At the same time, the two second connecting surfaces 201 on the main valve seat 20 are also arranged at an angle. In this way, when the main valve seat 20 is inserted into the main valve body 10 through the mounting hole 101, the abutment between the first connecting surfaces 102 and the second connecting surfaces 201 is used to limit the relative position of the main valve seat 20 and the main valve body 10, preventing the main valve seat 20 from being too deeply inserted into the main valve body 10, thereby improving the reliability of the connection between the two. In addition, the connecting pipe on the reversing valve 100 does not need to be connected to the main valve seat 20 and the main valve body 10 at the same time, which simplifies installation and helps reduce the installation precision requirements, thereby reducing the processing cost of the reversing valve 100.

[0036] In one embodiment, the main valve seat 20 and the main valve body 10 are fixedly connected using laser welding. Laser welding offers high energy density, a small heat-affected zone, and high welding speed, effectively reducing the thermal impact on the main valve seat 20 and the main valve body 10, thereby preventing softening and deformation caused by high temperatures. The main valve seat 20 can be pre-positioned by pressing it into the mounting hole 101, facilitating subsequent welding.

[0037] The angle between the first connecting surface 102 and the second connecting surface 201 and the axis of the mounting hole 101 can be set between 0° and 90°, preferably between 45° and 75°, to improve the reliability of laser welding. Figure 10 As shown, when laser welding the main valve seat 20 to the main valve body 10, the laser direction is set at an angle A with the axial direction of the mounting hole 101. The angle A should be between 0° and 90° to facilitate laser welding. Preferably, the angle A can be between 45° and 75°, which further improves the reliability of laser welding.

[0038] Optionally, the value of A can be 45°, 50°, 55°, 60°, 65°, 70° or 75°, etc., which are not listed here one by one.

[0039] In one embodiment, if Figure 2 As shown, the angle formed by the two first connection surfaces 102 is α, and the angle formed by the two second connection surfaces 201 is β, wherein β≥α. In this way, the welding effect between the main valve seat 20 and the main valve body 10 can be improved.

[0040] Specifically, when β>α, as the main valve seat 20 penetrates deeper into the mounting hole 101, the second connection surface 201 on the main valve seat 20 will first contact the edge of the first connection surface 102 near the outer surface of the main valve body 10, which facilitates laser welding between the two. In this application, β=α is preferably set, so that the assembly welding effect of the main valve seat 20 and the main valve body 10 is optimal.

[0041] Furthermore, when β is much greater than α, it is not conducive to improving the weld penetration between the main valve seat 20 and the main valve body 10. Therefore, considering actual production conditions, in this embodiment, it is preferably set to 0 ≤ β - α ≤ 2°. This effectively improves the laser welding effect between the main valve seat 20 and the main valve body 10 and reduces the welding difficulty.

[0042] The value of β-α may also be 0.5°, 1°, 1.5° or 2°, etc., which are not listed here one by one.

[0043] In one embodiment, if Figure 2 and Figure 10 As shown, the central axis of the main valve body 10 is located at the intersection of the planes where the two first connection surfaces 102 are located. That is, the intersection of the planes where the two first connection surfaces 102 are located is the central axis of the main valve body 10, which facilitates the processing of the mounting hole 101.

[0044] Specifically, the mounting hole 101 can be formed by laser cutting. Because the intersection of the planes containing the two first connecting surfaces 102 coincides with the central axis of the main valve body 10, the extension direction of the first connecting surfaces 102, i.e., the radial direction of the main valve body 10, is easily determined, enabling rapid laser cutting. Furthermore, the width of the mounting hole 101 at the first connecting surface 102 is equal to the thickness of the main valve body 10. This allows the weld penetration of the main valve seat 20 at the first connecting surface 102 to reach the thickness of the main valve body 10, thereby improving weld strength.

[0045] Furthermore, if Figure 1 As shown, the inner wall of the mounting hole 101 also includes two third connecting surfaces 103. The two third connecting surfaces 103 are arranged along the axial direction of the main valve body 10 and are both perpendicular to the central axis of the main valve body 10. Each end of the third connecting surface 103 is respectively connected to the two first connecting surfaces 102, and the third connecting surfaces 103 are welded to the outer wall of the main valve seat 20. That is, in this embodiment, the mounting hole 101 is a square hole, and the width of each surface is equal to the thickness of the main valve body 10. This allows the penetration depth to remain consistent at all locations during welding, which is beneficial to improving the strength of the weld. Of course, the third connecting surface 103 and the central axis of the main valve body 10 can also be set at a certain angle, which can be reasonably set according to actual conditions.

[0046] In one embodiment, if Figure 2-Figure 10 As shown, the outer wall of the main valve seat 20 is further provided with an arc surface 202, which is provided between the two second connection surfaces 201 and respectively connected to the two second connection surfaces 201. Along the radial direction of the main valve body 10, the arc surface 202 is not lower than the outer wall of the main valve body 10.

[0047] It is easy to know that if the arc surface 202 of the main valve seat 20 is lower than the outer wall of the main valve body 10 when the main valve seat 20 is installed on the main valve body 10, the thickness of the contact area between the main valve seat 20 and the main valve body 10 will be less than the wall thickness of the main valve body 10, and the welding reliability is low. However, in this embodiment, by setting the arc surface 202 not lower than the outer wall of the main valve body 10, it can ensure that the maximum welding penetration depth when the main valve seat 20 and the main valve body 10 are welded can reach the wall thickness of the main valve body 10, thereby effectively improving the welding strength of the two.

[0048] Specifically, the radius of the arc surface 202 is R, and the outer diameter of the main valve body 10 is D, where 0 ≤ 2R - D ≤ 2 mm. This ensures that the arc surface 202 protrudes radially from the outer wall of the main valve body 10 by a reasonable height, effectively controlling the material cost of the main valve seat 20 while ensuring weld penetration and reducing manufacturing difficulty. Alternatively, the value of 2R - D can be 0, 0.5 mm, 1 mm, 1.5 mm, or 2 mm, among other values ​​not listed here.

[0049] Furthermore, the wall thickness of the main valve body 10 is t, wherein 0.5 mm ≤ t ≤ 3 mm. In this way, the welding strength between the main valve seat 20 and the main valve body 10 can be ensured, and the cost can be controlled. Specifically, if t>3 mm, the wall thickness of the main valve body 10 is thicker, which increases the overall material cost of the reversing valve 100. If t<0.5 mm, the wall thickness of the main valve body 10 is thinner, which reduces the welding strength between the main valve seat 20 and the main valve body 10. Among them, the wall thickness t of the main valve body 10 can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm or 3 mm, etc., which are not listed here one by one.

[0050] Typically, the reversing valve 100 also includes a slider (not shown) and a piston assembly (not shown), and the piston assembly drives the slider to slide on the main valve seat 20, so that the slider is connected to different pipes, thereby changing the flow direction of the refrigerant.

[0051] In order to ensure the sealing performance between the slider and the main valve seat 20 and prevent internal leakage, in one embodiment, Figure 3-Figure 8 As shown, the outer wall of the main valve seat 20 is further provided with a sealing plane 203. The sealing plane 203 is provided on the side of the second connecting surface 201 away from the arc surface 202, and the two ends of the sealing plane 203 are respectively connected to the two second connecting surfaces 201. In other words, the sealing plane 203 is used to cooperate with the sliding slider in a sliding and sealing manner, thereby improving the reliability of the slider's movement.

[0052] In this embodiment, the main valve seat 20 can be formed by cold extrusion of a bar, and can be specifically formed by sequentially processing the steps of bar cutting, drilling, surface grinding, cleaning, and the like.

[0053] Furthermore, in one embodiment, Figure 3 、 Figure 4 and Figure 5 As shown, a transition arc surface 204 is provided between the circular arc surface 202 and the second connecting surface 201, and / or between the sealing plane 203 and the second connecting surface 201. By providing the transition arc surface 204, sharp corners can be avoided at the corners of the bar during cold extrusion, thereby avoiding stress concentration at the sharp corners, effectively extending the life of the die and reducing costs.

[0054] In another embodiment, Figure 6 、 Figure 7 and Figure 8 As shown, the outer wall of the main valve seat 20 is further provided with an extension surface 205. The extension surface 205 is disposed between the sealing plane 203 and the second connecting surface 201 and is connected to the sealing plane 203 and the second connecting surface 201, respectively. The two extension surfaces 205 are arranged in parallel. This ensures that the sealing plane 203 is the same size as the other, and that the extension surface 205 is connected to the second connecting surface 201, thereby reducing the material used in the main valve seat 200 and thus reducing costs.

[0055] Similarly, in this embodiment, a transition arc surface 204 is provided between the arc surface 202 and the second connecting surface 201, and / or between the second connecting surface 201 and the extension surface 205, and / or between the extension surface 205 and the sealing plane 203, so as to prevent stress concentration in the main valve seat 20 through the transition arc surface 204 and improve the reliability of the main valve seat 20.

[0056] Furthermore, in one embodiment, the radius of the transition arc surface 204 is r, where 0.2 mm ≤ r ≤ 3 mm. This facilitates the processing of the transition arc surface 204 and facilitates the molding of the main valve seat 20 by extrusion of a bar.

[0057] The radius of the transition arc surface 204 may be 0.2 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm or 3 mm, etc., and may be reasonably set according to actual processing requirements.

[0058] This application takes the reversing valve 100 as a four-way valve as an example for explanation. On this basis, Figure 9 and Figure 10 As shown, the reversing valve 100 further includes a D-type pipe 60, an E-type pipe 30, an S-type pipe 40, a C-type pipe 50, a D-type sleeve 61, an E-type sleeve 31, an S-type sleeve 41, a C-type sleeve 51, a D-type short capillary 62, an E-type short capillary 11, an S-type short capillary 42, and a C-type short capillary 12. The E-type pipe 30, the S-type pipe 40, and the C-type pipe 50 are connected side by side to the main valve seat 20, and the E-type sleeve 31 is mounted on the end of the E-type pipe 30 away from the main valve seat 20, the S-type sleeve 41 is mounted on the end of the S-type pipe 40 away from the main valve seat 20, and the C-type sleeve 51 is mounted on the end of the C-type pipe 50 away from the main valve seat 20. The E-type sleeve 31, the S-type sleeve 41, and the C-type sleeve 51 serve as a transfer device to facilitate welding of the reversing valve 100 to external pipelines.

[0059] Furthermore, the reversing valve 100 also includes a pilot valve (not shown). Here, the short capillary tubes D 62, E 11, S 42, and C 12 are all connected to the pilot valve via corresponding capillary tubes. This allows the pilot valve to change the pressure differential across the piston assembly, thereby facilitating the piston assembly to drive the slider to slide within the main valve body 10. Specifically, the short capillary tube D 62 is connected to the sidewall of the D-type pipe 60 and communicates with the interior of the D-type pipe 60. The short capillary tube S 42 is connected to the sidewall of the S-type pipe 40 and communicates with the interior of the S-type pipe 40. The short capillary tubes E 11 and C 12 are respectively connected to opposite ends of the main valve body 10 along the axial direction and communicate with the chambers at both ends of the piston assembly.

[0060] When the reversing valve 100 is in operation, the D pipe 60 contains high-pressure refrigerant and the S pipe 40 contains low-pressure refrigerant. The pilot valve introduces the high-pressure refrigerant in the D pipe 60 into the pilot valve through the capillary connected to the D short capillary 62, and then introduces it into the chamber at one end of the piston assembly through one of the two capillaries connected to the E short capillary 11 or the C short capillary 12. The refrigerant in the chamber at the other end of the piston assembly is discharged to the pilot valve through the other, and finally discharged to the S pipe 40 through the capillary connected to the S short capillary 42, thereby realizing the reversal of the slider and the piston assembly.

[0061] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of patent protection for the present application shall be determined by the appended claims.

Claims

1. A reversing valve, characterized in that: The invention comprises a main valve body (10) and a main valve seat (20), wherein a mounting hole (101) is provided on a side wall of the main valve body (10), wherein the mounting hole (101) communicates with the interior and exterior of the main valve body (10), and wherein the inner wall of the mounting hole (101) comprises two first connecting surfaces (102), wherein the two first connecting surfaces (102) are arranged along the circumference of the main valve body (10), and the two first connecting surfaces (102) are arranged at an angle, and along the radial direction of the main valve body (10), the distance between the two first connecting surfaces (102) gradually increases from the interior to the exterior of the main valve body (10); The main valve seat (20) is installed in the installation hole (101), and the outer wall of the main valve seat (20) includes two second connecting surfaces (201), and the two second connecting surfaces (201) are respectively at least partially in contact with the two first connecting surfaces (102) and are welded and fixed.

2. The reversing valve according to claim 1, characterized in that: The angle formed by the two first connecting surfaces (102) is α, and the angle formed by the two second connecting surfaces (201) is β, wherein β≥α.

3. The reversing valve according to claim 2, characterized in that: 0≤β-α≤2°。 4. The reversing valve according to claim 1, characterized in that: The central axis of the main valve body (10) is located at the intersection of the planes where the two first connecting surfaces (102) are located.

5. The reversing valve according to claim 1, characterized in that: The inner wall of the mounting hole (101) further comprises two third connecting surfaces (103), the two third connecting surfaces (103) being arranged along the axial direction of the main valve body (10) and both being arranged perpendicular to the central axis of the main valve body (10); Wherein, both ends of each of the third connecting surfaces (103) are respectively connected to the two first connecting surfaces (102), and the third connecting surface (103) is fixed to the outer wall of the main valve seat (20) by welding.

6. The reversing valve according to claim 1, characterized in that: The outer wall of the main valve seat (20) is further provided with an arc surface (202), and the arc surface (202) is provided between the two second connecting surfaces (201) and is respectively connected to the two second connecting surfaces (201). Along the radial direction of the main valve body (10), the arc surface (202) is not lower than the outer side wall of the main valve body (10).

7. The reversing valve according to claim 6, characterized in that: The radius of the arc surface (202) is R, and the outer diameter of the main valve body (10) is D, wherein 0≤2R-D≤2mm.

8. The reversing valve according to claim 6, characterized in that: The outer wall of the main valve seat (20) is further provided with a sealing plane (203), which is provided on the side of the second connecting surface (201) away from the arc surface (202), and the two ends of the sealing plane (203) are respectively connected to the two second connecting surfaces (201).

9. The reversing valve according to claim 8, characterized in that: The outer wall of the main valve seat (20) is further provided with an extension surface (205), and the extension surface (205) is provided between the sealing plane (203) and the second connecting surface (201), and is connected to the sealing plane (203) and the second connecting surface (201) respectively; Wherein, the two extension surfaces (205) are arranged in parallel.

10. The reversing valve according to claim 1, characterized in that: The main valve seat (20) and the main valve body (10) are fixed by laser welding.

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