Reversing valve

Abstract

A reversing valve, comprising a main valve (A). The main valve comprises a valve body assembly (1) and a valve assembly (2), the valve assembly comprising a valve core (20), a first piston assembly (21) and a second piston assembly (22). The first piston assembly comprises a first piston component (211), the first piston component comprising a first piston body (2111) and a first sealing member (2112); an outer wall of the first piston body comprises a first accommodating groove (M), and the first sealing member is arranged in the first accommodating groove; the first accommodating groove comprises a first bottom wall (M1) facing an inner wall of the valve body assembly, and the first sealing member abuts between the inner wall of the valve body assembly and the first bottom wall. The second piston assembly comprises a second piston component (221), the second piston component comprising a second piston body (2211) and a second sealing member (2212); an outer wall of the second piston body comprises a second accommodating groove (N), and the second sealing member is arranged in the second accommodating groove; the second accommodating groove comprises a second bottom wall (N1) facing the inner wall of the valve body assembly, and the second sealing member abuts between the inner wall of the valve body assembly and the second bottom wall. Thus, the action reliability of the main valve is improved.

Description

A reversing valve

[0001] This application claims priority to the utility model patent application filed with the Patent Office of China on August 4, 2023, with application number CN202322081903.4 and invention name “A Reversing Valve”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present invention relates to the technical field of valves, and in particular to a reversing valve. Background Art

[0003] FIG1 shows a schematic structural diagram of a reversing valve according to background technology. The reversing valve includes a main valve A1 and a control valve A2, which are connected to each other via a pipeline. The main valve A1 includes a valve body 010, a first end cap 020, a second end cap 030, and a slider 02. The valve body 010 is cylindrical, and the outer wall of the slider 02 is adapted to fit the inner wall of the valve body 010. The slider 02 is axially slidable within the valve body 010. The control valve A2 is used to switch the pressure on both sides of the slider 02, thereby switching the flow path of the main valve A1. In this solution, the slider 02 is connected to two pistons 04, respectively, via two connecting rods 03. The pistons 04 are made of PTFE material, and the outer walls of the two pistons 04 are slidably fitted with the first end cap 020 and the second end cap 030, respectively.

[0004] In the above solution, the sealing performance between piston 04 and first end cap 020, and between piston 04 and second end cap 030, affects the operational reliability of main valve A1. Therefore, improving the sealing performance between the piston and end caps, and thereby improving the operational reliability of the main valve, is a problem that requires attention by those skilled in the art.

[0005] Summary of the Invention

[0006] The object of the present invention is to provide a reversing valve to improve the operation reliability of the reversing valve.

[0007] The reversing valve provided by the present invention includes a main valve, the main valve includes a valve body assembly and a valve assembly, the valve assembly is arranged in the inner cavity of the valve body assembly, the valve assembly includes a valve core, a first piston assembly and a second piston assembly, the first piston assembly is fixedly connected or limitedly connected to the valve core, and the second piston assembly is fixedly connected or limitedly connected to the valve core;

[0008] The first piston assembly includes a first piston component, the first piston component includes a first piston body and a first sealing member, the outer wall of the first piston body includes a first receiving groove, the first sealing member is disposed in the first receiving groove, the first receiving groove includes a first bottom wall facing the inner wall of the valve body assembly, and the first sealing member abuts between the inner wall of the valve body assembly and the first bottom wall.

[0009] The second piston assembly includes a second piston component, the second piston component includes a second piston body and a second sealing component, the outer wall of the second piston body includes a second accommodating groove, the second sealing component is arranged in the second accommodating groove, the second accommodating groove includes a second bottom wall facing the inner wall of the valve body assembly, and the second sealing component abuts between the inner wall of the valve body assembly and the second bottom wall.

[0010] In the reversing valve of the above scheme, the outer wall of the first piston body includes a first accommodating groove, the first sealing component is arranged in the first accommodating groove, and the first sealing component abuts between the inner wall of the valve body assembly and the first bottom wall; the outer wall of the second piston body includes a second accommodating groove, the second sealing component is arranged in the second accommodating groove, and the second sealing component abuts between the inner wall of the valve body assembly and the second bottom wall, so as to improve the operation reliability of the reversing valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] FIG1 is a schematic structural diagram of a reversing valve in the background art;

[0012] FIG2 is a schematic structural diagram of a reversing valve according to a first embodiment of the present application;

[0013] FIG3 is a schematic structural diagram of the valve assembly in FIG2 ;

[0014] FIG4A is a schematic diagram of the three-dimensional structure of the main valve core in FIG2 at one angle;

[0015] FIG4B is a schematic diagram of the three-dimensional structure of the main valve core in FIG2 from another angle;

[0016] FIG5 is a partial enlarged view of point I1 in FIG2 ;

[0017] FIG5A is a partial enlarged view of point I2 in FIG5 ;

[0018] FIG5B is a partial enlarged view of point I3 in FIG2 ;

[0019] FIG5C is a partial enlarged view of point I4 in FIG5B ;

[0020] FIG6 is a schematic diagram showing the three-dimensional structure of the first piston body in FIG5 ;

[0021] FIG7 is a schematic diagram showing the three-dimensional structure of the first connecting member in FIG2 ;

[0022] FIG8 is a schematic diagram showing the three-dimensional structure of the first position-limiting member in FIG2 . DETAILED DESCRIPTION

[0023] The present invention will be described in further detail below with reference to the accompanying drawings.

[0024] As shown in FIG. 2 and FIG. 5 , in this embodiment, the reversing valve includes a main valve A and a control valve B, and the main valve A and the control valve B are connected through a pipeline.

[0025] As shown in FIG. 2 , the main valve A includes a valve body assembly 1 and a valve assembly 2 .

[0026] The valve body assembly 1 includes a valve body component 10, a first piston housing component 11, and a second piston housing component 12. The first piston housing component 11 is fixedly connected to the valve body component 10, and the second piston housing component 12 is fixedly connected to the valve body component 10. The valve body component 10 includes a valve body 100 and a first connecting plate 200 and a second connecting plate 300. The first piston housing component 11 and the second piston housing component 12 are respectively located at the two ends of the valve body 100 in the longitudinal direction.

[0027] The valve body 100 is cylindrical in shape, and the first connecting plate 200 and the second connecting plate 300 are annular plates. The first connecting plate 200 is mounted on the outer wall of the first end of the valve body 100 and is welded to the valve body 100. The second connecting plate 300 is mounted on the outer wall of the second end of the valve body 100 and is welded to the valve body 100.

[0028] In this embodiment, when defining the position shown in Figure 2 , the X direction in the figure represents the length of the valve core 20, and the Y direction in the figure represents the height of the valve core 20. In this embodiment, the valve core 20 includes an upper wall portion 101 and a lower wall portion 102 arranged in parallel. In the height direction of the valve core 20 shown in Figure 2 , the lower wall portion 102 is located below the upper wall portion 101.

[0029] The valve core 20 also includes a front wall portion and a rear wall portion (not shown) connecting the upper wall portion 101 and the lower wall portion 102. The front wall portion and the rear wall portion are arranged parallel to each other. In this embodiment, the upper wall portion 101, the lower wall portion 102, the front wall portion, and the rear wall portion are all flat-plate shaped, meaning that the valve body 100 has a rectangular cylindrical structure with a rectangular inner cross-section. The outer wall surface of the valve core described below corresponds to the shape of the inner wall surface of the valve body 100. It should be noted that the structure of the valve body 100 is not limited to the aforementioned structure, as long as the valve core 20 can move longitudinally relative to the valve body 100 within the valve body 100.

[0030] The first piston housing component 11 includes a first piston housing 111, a first cover plate 112, and a first sealing cap 113. The first piston housing 111 is cylindrical, with a circular inner wall cross-section. The first cover plate 112 is annular and fits over the outer wall of the first piston housing 111 at the end adjacent to the valve body 100. The first cover plate 112 is welded to the first piston housing 111 and fastened to the first connecting plate 200 via a plurality of screws. The first sealing cap 113 seals the end of the first piston housing 111 away from the valve body 100. Specifically, the first sealing cap 113 is located within the first piston housing 111 and is welded to the first piston housing 111.

[0031] The valve body component 10 is made of steel, specifically stainless steel in this embodiment.

[0032] As shown in FIG. 2 and FIG. 3 , the valve assembly 2 includes a valve core 20 , a first piston assembly 21 , and a second piston assembly 22 .

[0033] In this embodiment, in the longitudinal direction of the valve body 100 , the first piston assembly 21 and the second piston assembly 22 are respectively located on both sides of the valve core 20 in the longitudinal direction.

[0034] The core point of this application is the structural design of the piston assembly, so the structural details of the valve core 20 will not be described in detail.

[0035] As shown in Figures 2, 3, 6, 7, and 8, the first piston assembly 21 includes a first piston component 211 and a first connecting member 212. The first piston component 211 includes a first piston body 2111 and a first sealing member 2112. The second piston assembly 22 includes a second piston component 221 and a second connecting member 222. The second piston component 221 includes a second piston body 2211 and a second sealing member 2212. The valve assembly 2 divides the inner cavity of the valve body assembly 1 into a main chamber W located between the first and second piston components 211 and 221; a first chamber Y located on the side of the first piston component 211 away from the main chamber W; and a second chamber Z located on the side of the second piston component 221 away from the main chamber W. The size relationship between the first chamber Y and the second chamber Z changes as the valve core 20 moves relative to the valve body 100.

[0036] In order to improve the reliability of the reversing valve and prevent the energy efficiency of the refrigeration system using the reversing valve from being reduced, the main chamber W and the first chamber Y are required to be sealed and isolated. Similarly, the main chamber W and the second chamber Z are also sealed and isolated.

[0037] The first piston body 2111 is fixedly connected or limitedly connected to the first connecting member 212, and the first sealing member 2112 is limitedly connected to the first piston body 2111. The fixed connection refers to the first piston body 2111 and the first connecting member 212 being tightly connected and unable to move relative to each other, for example, by welding or threaded connection, or by a third member to fix the two. The limited connection means that in a non-fixed connection state, the first piston body 2111 can also move with the movement of the first connecting member 212, for example, the first piston body 2111 and the first connecting member 212 are movably engaged, and there is a gap between the two in the radial direction of the first piston body 2111, but the first piston body 2111 can move with the first connecting member 212.

[0038] As shown in Figures 6 and 7, the first piston body 2111 is annular, and the first connecting member 212 is cylindrical. The first connecting member 212 includes a first main body 212A, a first sleeve portion 212B and a first anti-slip portion 212D located on either side of the first main body 212A in the longitudinal direction, and a first threaded portion 212C. The first sleeve portion 212B is located between the first threaded portion 212C and the first main body 212A.

[0039] In this embodiment, the first main body portion 212A is cylindrical, the first sleeve portion 212B is cylindrical, and the outer diameter of the first main body portion 212A is larger than the outer diameter of the first sleeve portion 212B, so that the end of the first main body portion 212A facing the first piston body 2111 serves as the first limiting portion 212a.

[0040] The first piston assembly 21 further includes a first bolt 214. After the first piston body 2111 is sleeved onto the outer circumference of the first sleeve portion 212B and is restrained by the first limiting portion 212a, the first bolt 214 and the first threaded portion 212C are threadedly engaged to securely connect the first piston body 2111 to the first connecting member 212. It should be noted that the first limiting portion 212a is not limited to the aforementioned structure. The first limiting portion 212a can be formed by snapping, welding, or threading another component onto the outer wall of the first connecting member 212. Alternatively, the first limiting portion 212a can be formed on the first connecting member 212 as a radially protruding portion relative to the first sleeve portion 212B but not having the same outer diameter as the first main body portion 212A. Any method is sufficient to limit the position of the first piston body 2111 along one side of the length direction of the valve body 100.

[0041] As shown in Figures 2, 3, 7 and 8, the first anti-slip portion 212D of the first connecting member 212 is a circular ring, and its outer diameter is larger than the outer diameter of the first main body portion 212A, that is, the first anti-slip portion 212D and the first main body portion 212A are integrally formed, which is convenient for processing and does not require additional parts. However, it should be emphasized that the first anti-slip portion 212D can also be formed by another part fixedly connected to the first connecting member 212 and serve as at least a part of the first connecting member 212.

[0042] The first piston assembly 21 further includes a first stopper 213. The first stopper 213 is restrained from separating from the first connecting member 212 by the first piston body 2111 and the first anti-detachment portion 212D. As shown in FIG3 , the first stopper 213 is fixedly connected to the valve core 20 via a plurality of screws 226.

[0043] The first stopper 213 is in floating connection with the first connecting member 212, that is, the first stopper 213 and the first connecting member 212 do not contact each other in the circumferential direction of the valve body 100. Specifically, as shown in Figures 2 and 8, the first stopper 213 includes a first axial stopper portion 213A and a first radial stopper portion 213B. The first axial stopper portion 213A is in the shape of a circular ring plate, and the first radial stopper portion 213B is in the shape of a circular ring cylinder. The first radial stopper portion 213B extends from the end of the first axial stopper portion 213A that is closest to the valve core 20 toward the valve core 20.

[0044] The first axial limiting portion 213A is located at the outer periphery of the first main body portion 212A, and the first radial limiting portion 213B is at least partially located at the outer periphery of the first anti-slip portion 212D. The inner diameter of the first axial limiting portion 213A is defined as D1, the outer diameter of the first main body portion 212A is defined as D2, the inner diameter of the first radial limiting portion 213B is defined as D3, and the outer diameter of the first anti-slip portion 212D is defined as D4. Then, D1>D2, D3>D4, and (D1-D2)>(D3-D4), thereby achieving that the first limiting member 213 and the first connecting member 212 do not contact each other in the circumferential direction of the valve body 100.

[0045] As shown in Figures 2, 5 and 5A, the first piston body 2111 includes a first receiving groove M opening toward the inner wall of the first piston shell 111, and the first sealing member 2112 includes a first sealing ring 2112A and a first sealing ring 2112B. The first sealing ring 2112A is annular and is sleeved in the first receiving groove M of the first piston body 2111. The first sealing ring 2112B is annular and has a certain length in the longitudinal direction of the valve body 100. The first sealing ring 2112B is partially located in the first receiving groove M, and the first sealing ring 2112B is sleeved on the outer periphery of the first sealing ring 2112A.

[0046] The first sealing ring 2112A abuts against the first bottom wall M1 of the first accommodating groove M (i.e., the wall portion facing the inner wall of the first piston housing 111), and the first sealing ring 2112A abuts against the inner wall of the first sealing ring 2112B. The cross-sectional area of ​​the first piston housing 111 is smaller than the cross-sectional area of ​​the valve body 100. The first piston body 2111 is located in the first piston housing 111, and the outer wall of the first sealing ring 2112B abuts against and slides with the inner wall of the first piston housing 111.

[0047] The valve core 20 can slide relative to the valve body 100 in the length direction of the valve body 100 with the first piston assembly 21 and the second piston assembly 22. By placing the first sealing component 2112 in the first accommodating groove M, and the first sealing component 2112 includes a first sealing ring 2112A and a first sealing ring 2112B, it can improve or prevent the fluid in the aforementioned main chamber W from flowing through the first chamber Y to the low-pressure end of the control valve, causing a reduction in refrigerant flow and ultimately affecting the energy efficiency of the refrigeration system.

[0048] Furthermore, the material of the first piston body 2111 is aluminum alloy, and the material of the first piston housing 111 is steel. As a result, there is a significant hardness difference between the materials of the first piston body 2111 and the first piston housing 111, thereby preventing the inner wall of the first piston housing 111 from being scratched during the assembly of the first piston component 211 and the first piston housing 111, thereby preventing the reliability of the movement of the first piston component 211 in the first piston housing 111.

[0049] In a further solution, as shown in Figure 5A, in the thickness direction of the first piston body 2111, that is, the length direction of the valve body 100 (X direction in Figure 2), the first piston body 2111 includes a first annular portion 2111A and a second annular portion 2111B respectively located on both sides of the first sealing member 2112, and the relative inner walls of the first annular portion 2111A and the second annular portion 2111B serve as at least part of the groove wall of the first accommodating groove M.

[0050] Specifically, as shown in Figure 5A, the first annular portion 2111A includes a first inner wall surface 2111a and a first outer wall surface 2111b, and the first inner wall surface 2111a is arranged parallel to the second outer wall surface 2111b. The first annular portion 2111A also includes a first transition surface 2111c connecting the first inner wall surface 2111a and the first outer wall surface 2111b. The diameter of the end of the first transition surface 2111c connected to the first outer wall surface 2111a (that is, the diameter of the first outer wall surface 2111b) is smaller than the diameter of the end of the first transition surface 2111c connected to the first inner wall surface 2111a (that is, the outer diameter of the first inner wall surface 2111a). Furthermore, the diameter of the end of the first transition surface 2111c connected to the first inner wall surface 2111a is smaller than the inner diameter of the first piston housing 111. A first gap δ1 is defined between the first transition surface 2111c and the inner wall of the first piston housing 211. This means that the first piston body 2111 and the first piston housing 111 do not contact each other radially in the first piston housing 111. This gap δ1 decreases from the first outer wall surface 2111b toward the first inner wall surface 2111a. The first transition surface 2111c can be an inclined surface or an arc-shaped curved surface. The provision of the first transition surface 2111c can reduce resistance that may be generated when the first piston member 211 slides within the first piston housing 111, preventing the first piston member 211 from becoming stuck or malfunctioning. Furthermore, when the first piston member 211 is assembled with the first piston housing 111, a certain rotation angle between the first piston member 211 and the first piston housing 111 is achieved, facilitating assembly.

[0051] The minimum gap between the first transition surface 2111c and the inner wall of the first piston housing 111 is defined as γ1. It should be noted that the value of the aforementioned gap δ1 is not necessarily the larger the better. The range of the gap γ1 is greater than or equal to 0.3 mm and less than or equal to 0.5 mm.

[0052] The above-mentioned first sealing ring 2112B is specifically a non-standard Gly ring. Its thickness D is defined as γ1 which is 2.5 to 3 times of D. The design of the first sealing ring 2112B and the first transition surface 2111c can prevent the first sealing ring 2112B from undergoing transitional stretching in the radial direction and causing permanent deformation, and makes it easy to assemble the first piston component 211 to the first piston housing 111.

[0053] Specifically, as shown in FIG5A , the second annular portion 2111B includes a second inner wall surface 2111d and a second outer wall surface 2111e. The second inner wall surface 2111d and the aforementioned first inner wall surface 2111c are at least part of the groove wall of the aforementioned first accommodating groove M. The second inner wall surface 2111d and the second outer wall surface 2111e are arranged in parallel. The second annular portion 2111B also includes a second transition surface 2111f connecting the second inner wall surface 2111d and the second outer wall surface 2111e. The second transition surface 2111f and the second outer wall surface 2111e are connected. The diameter of the end connected to the second outer wall 2111e (i.e., the outer diameter of the second outer wall 2111e) is greater than the diameter of the end connected to the second inner wall 2111d (i.e., the outer diameter of the second inner wall 2111d), and the diameter of the end connected to the second inner wall 2111d is smaller than the inner diameter of the first piston housing 111. A second gap δ2 is defined between the second transition surface 2111f and the inner wall of the first piston housing 111, and this gap δ2 decreases from the second outer wall 2111e toward the second inner wall 2111d. The second transition surface 2111f can be in the form of an inclined surface or an arc-shaped curved surface. The provision of the second transition surface 2111f can reduce the resistance that may be generated when the first piston component 211 slides within the first piston housing 111, thereby preventing the first piston component 211 from becoming stuck or malfunctioning. Furthermore, when the first piston component 211 is assembled with the first piston housing 111 , a certain rotation angle can be maintained between the first piston component 211 and the first piston housing 111 , thereby facilitating assembly.

[0054] The minimum gap between the second transition surface 2111c and the inner wall of the first piston housing 111 is defined as γ2. It should be noted that the value of the aforementioned gap δ2 is not necessarily the larger the better. The range of the gap γ2 is greater than or equal to 0.3 mm and less than or equal to 0.5 mm.

[0055] First sealing ring 2112A is made of rubber. Its deformation allows it to radially expand first sealing ring 2112B, maintaining contact with the inner wall of first piston housing 111. First sealing ring 2112B is a non-standard Glyd ring. Its thickness, D, satisfies the following conditions: D is 2.5 to 3 times γ1, and D is 2.5 to 3 times γ2. The design of first sealing ring 2112B and its relationships with first and second transition surfaces 2111c and 2111f prevents radial stretching and permanent deformation of first sealing ring 2112B, facilitating easy assembly of first piston component 2111 to first piston housing 111.

[0056] As shown in Figures 5 and 5A , a first sealing groove 212b is defined on the outer wall of the first sleeve portion 212B of the first connector 212. An O-ring 215 is located in the first sealing groove 212b and abuts the first sleeve portion 212B and the first piston body 2111 in the radial direction of the first piston body 2111. The O-ring 215 also serves as a seal and isolates the fluid on both sides of the first piston member 211.

[0057] 2 and 3 , the valve assembly 2 further includes a second piston assembly 22 and a second piston housing 12 . In the longitudinal direction of the valve body 100 , the second piston assembly 22 and the second piston housing 12 are located on a side of the valve core 20 away from the first piston housing 11 .

[0058] The second piston housing component and the second piston assembly are described in detail below.

[0059] The second piston housing component 12 includes a second piston housing 121, a second cover plate 122, and a second sealing cap 123. The second piston housing 121 is cylindrical with a circular inner wall cross-section. The second cover plate 122 is annular and fits over the outer wall of the second piston housing 121 at the end adjacent to the valve body 100. The second cover plate 122 is welded to the second piston housing 121 and fastened to the second connecting plate 300 via a plurality of screws. The first sealing cap 123 seals the end of the second piston housing 121 away from the valve body 100. Specifically, the second sealing cap 123 is located within the second piston housing 121 and is welded to the second piston housing 121.

[0060] As shown in FIG. 2 , FIG. 3 , FIG. 6 , FIG. 7 , and FIG. 8 , the second piston assembly 22 includes a second piston component 221 and a first connecting member 222 . The second piston component 221 includes a second piston body 2211 and a second sealing member 2212 .

[0061] The second piston body 2211 is fixedly connected or position-limitedly connected to the second connecting member 222, and the second sealing member 2212 is position-limitedly connected to the second piston body 2211. The fixed connection refers to a tight connection between the second piston body 2211 and the second connecting member 222, without relative movement, such as by welding or threaded connection, or by a third member to fix the two. The position-limited connection means that in a non-fixed connection state, the second piston body 2211 can also move with the movement of the second connecting member 222, for example, the second piston body 2211 and the second connecting member 222 are movably engaged, with a gap between the two in the radial direction of the second piston body 2211, but the second piston body 2211 can move with the second connecting member 222.

[0062] As shown in Figures 2, 5B, and 5C, the second piston body 2211 is annular, and the second connecting member 222 is cylindrical. The second connecting member 222 includes a second main body 222A, second sleeve portions 222B and second anti-slip portions 222D located on either side of the second main body 222A in the longitudinal direction, and a second threaded portion 222C. The second sleeve portion 222B is located between the second threaded portion 222C and the second main body 222A.

[0063] In this embodiment, the second main body portion 222A is cylindrical, the second sleeve portion 222B is cylindrical, and the outer diameter of the second main body portion 222A is larger than the outer diameter of the second sleeve portion 222B, so that the end of the second main body portion 222A facing the second piston body 2211 serves as the second limiting portion 222a.

[0064] The second piston assembly 22 further includes a second bolt 224. After the second piston body 2211 is sleeved onto the outer circumference of the second sleeve portion 222B and is restrained by the second limiting portion 222a, the second bolt 224 and the second threaded portion 222C are threadedly engaged to securely connect the second piston body 2211 to the second connecting member 222. It should be noted that the second limiting portion 222a is not limited to the aforementioned structure. The second limiting portion 222a can be formed by snapping, welding, or threading another part onto the outer wall of the second connecting member 222. Alternatively, the second limiting portion 222a can be formed on the second connecting member 222 as a radially protruding portion relative to the second sleeve portion 222B but having a different outer diameter than the second main body portion 222A. Any method is sufficient to limit the position of the second piston body 2211 along one side of the length direction of the valve body 100.

[0065] As shown in Figures 2, 3, 5B and 5C, the second anti-slip portion 222D of the second connecting member 222 is circular, and its outer diameter is larger than the outer diameter of the second main body portion 222A, that is, the second anti-slip portion 222D and the second main body portion 222A are integrally formed, which is convenient for processing and does not require the addition of additional parts. However, it should be emphasized that the second anti-slip portion 222D can also be formed by another part fixedly connected to the second connecting member 222 and serve as at least a part of the second connecting member 222.

[0066] The second piston assembly 22 further includes a second stopper 223. The second stopper 223 is prevented from separating from the second connecting member 222 by the second piston body 2211 and the second anti-detachment portion 222D. The second stopper 223 is fixedly connected to the valve core 20 via a plurality of screws 226.

[0067] The second stopper 223 is in floating connection with the second connecting member 222, i.e., the second stopper 223 and the second connecting member 222 do not contact each other in the circumferential direction of the valve body 100. Specifically, as shown in FIG2 and with reference to FIG5B , the second stopper 223 includes a second axial stopper portion 223A and a second radial stopper portion 223B. The second axial stopper portion 223A is in the shape of a circular ring plate, and the second radial stopper portion 223B is in the shape of a circular ring cylinder. The second radial stopper portion 223B extends from the end of the second axial stopper portion 223A that is closest to the valve core 20 toward the valve core 20.

[0068] The second axial limiting portion 223A is located at the outer periphery of the second main body portion 222A, and the second radial limiting portion 223B is at least partially located at the outer periphery of the second anti-slip portion 222D. The inner diameter of the second axial limiting portion 223A is defined as D1, the outer diameter of the second main body portion 222A is defined as D2, the inner diameter of the second radial limiting portion 223B is defined as D3, and the outer diameter of the second anti-slip portion 212D is defined as D4. Then, D1>D2, D3>D4, and (D2-D1)>(D3-D4), thereby achieving that the second limiting member 223 and the second connecting member 222 do not contact each other in the circumferential direction of the valve body 100.

[0069] As shown in Figure 2, 5B and 5C, the second piston body 2211 includes a second accommodating groove N opening toward the inner wall of the second piston shell 121, and the second sealing member 2212 includes a second sealing ring 2212A and a second sealing ring 2212B. The second sealing ring 2212A is annular and is sleeved in the second accommodating groove N of the second piston body 2211. The second sealing ring 2212B is annular and has a certain length in the longitudinal direction of the valve body 100. The second sealing ring 2212B is partially located in the second accommodating groove N, and the second sealing ring 2212B is sleeved on the outer periphery of the second sealing ring 2212A. The second sealing ring 2212A abuts against the second bottom wall N1 of the second accommodating groove N (i.e., the wall portion facing the inner wall of the second piston housing 121), and the outer wall of the second sealing ring 2212A abuts against the inner wall of the second sealing ring 2212B. The cross-sectional area of ​​the second piston housing 121 is smaller than the cross-sectional area of ​​the valve body 100. The second piston body 2211 is located in the second piston housing 121, and the outer wall of the second sealing ring 2212B abuts against and slides with the inner wall of the second piston housing 121.

[0070] In the above-mentioned scheme, the valve core 20 can slide relative to the valve body 100 in the longitudinal direction of the valve body 100 with the first piston assembly 21 and the second piston assembly 22. By placing the first sealing member 2112 in the first accommodating groove M, making the first sealing member 2112 abut against the first accommodating groove M and the valve body, and placing the second sealing member 2212 in the second accommodating groove N, and the second sealing member 2212 abut against the second accommodating groove N and the valve body 100, it is possible to improve or prevent the fluid in the above-mentioned main chamber W from flowing to the low-pressure end of the control valve through the second chamber Z, thereby improving the operation reliability of the reversing valve and avoiding the hidden dangers of reducing the refrigerant flow and ultimately affecting the energy efficiency of the refrigeration system.

[0071] Furthermore, the material of the second piston body 2211 is aluminum alloy, and the material of the second piston housing 21 is steel. As a result, there is a significant hardness difference between the materials of the second piston body 2211 and the second piston housing 121, thereby preventing the inner wall of the second piston housing 121 from being scratched during the assembly process of the second piston component 221 and the second piston housing 121, thereby affecting the reliability of the movement of the second piston component 221 in the second piston housing 121.

[0072] In a further solution, as shown in Figure 5C, in the thickness direction of the second piston body 2211, that is, the length direction of the valve body 100 (X direction in Figure 2), the second piston body 2211 includes a third annular portion 2213A and a fourth annular portion 2214B respectively located on both sides of the second sealing member 2212, and the relative inner walls of the third annular portion 2213A and the fourth annular portion 2214B serve as at least part of the groove wall of the second accommodating groove N.

[0073] Specifically, as shown in Figure 5C, the third annular portion 2213A includes a third inner wall surface 2213a and a third outer wall surface 2213b, and the third inner wall surface 2213a is arranged parallel to the third outer wall surface 2213b. The third annular portion 2213A also includes a third transition surface 2213c connecting the third inner wall surface 2213a and the third outer wall surface 2213b. The diameter of the end of the third transition surface 2213c connected to the third outer wall surface 2213b (that is, the outer diameter of the third outer wall surface 2213b) is smaller than the diameter of the end of the third transition surface 2213c connected to the third inner wall surface 2213a (that is, the outer diameter of the third inner wall surface 2213a). The diameter of the end of the third transition surface 2213c connected to the third inner wall surface 2213a is smaller than the inner diameter of the second piston housing 121. A third gap δ3 is defined between the third transition surface 2213c and the inner wall of the second piston housing 121. This means that the second piston body 2211 and the second piston housing 121 do not contact each other radially in the second piston housing 121. This gap δ3 decreases from the third outer wall surface 2213b toward the third inner wall surface 2213a. The third transition surface 2213c can be an inclined surface or an arc-shaped curved surface. The provision of the third transition surface 2213c can reduce resistance that may be generated when the second piston component 221 slides within the second piston housing 121, preventing the second piston component 221 from becoming stuck or malfunctioning. Furthermore, when the second piston component 221 is assembled with the second piston housing 121, a certain rotation angle between the second piston component 221 and the second piston housing 121 is achieved, facilitating assembly.

[0074] The minimum gap between the third transition surface 2213c and the inner wall of the second piston housing 121 is defined as γ3. It should be noted that the value of the aforementioned gap δ3 is not necessarily the larger the better. The range of the gap γ3 is greater than or equal to 0.3 mm and less than or equal to 0.5 mm.

[0075] In the above embodiment, the second sealing ring 2212B is made of plastic and the second sealing ring 2212A is made of rubber. The deformation of the second sealing ring 2212A radially expands the second sealing ring 2212B, so that the second sealing ring 2212B maintains contact with the inner wall of the second piston housing 121.

[0076] Specifically, as shown in FIG5C , the fourth annular portion 2214B includes a fourth inner wall surface 2214d and a fourth outer wall surface 2214e. The fourth inner wall surface 2214d and the aforementioned third inner wall surface 2213a are at least part of the groove wall of the aforementioned second accommodating groove N. The fourth inner wall surface 2214d is arranged parallel to the fourth outer wall surface 2214e. The fourth annular portion 2214B also includes a fourth transition surface 2214f connecting the fourth inner wall surface 2214d and the fourth outer wall surface 2214e. The fourth transition surface 2214f is parallel to the fourth outer wall surface 2214e. The diameter of the fourth transition surface 2214f at one end connected to the fourth inner wall 2214d (i.e., the outer diameter of the fourth inner wall 2214d) is smaller than the diameter of the fourth transition surface 2214f at one end connected to the fourth inner wall 2214d (i.e., the outer diameter of the fourth inner wall 2214d). Furthermore, the diameter of the fourth transition surface 2214f at one end connected to the fourth inner wall 2214d is smaller than the inner diameter of the second piston housing 121. A fourth gap δ4 is defined between the fourth transition surface 2214f and the inner wall of the second piston housing 121. This means that the second piston body 2211 and the second piston housing 121 do not contact each other radially in the second piston housing 121. This gap δ4 decreases from the fourth outer wall 2214e toward the fourth inner wall 2214d. The fourth transition surface 2214f can be an inclined surface or an arc-shaped curved surface. The provision of the fourth transition surface 2214f can reduce resistance that may be generated when the second piston component 221 slides within the second piston housing 121, thereby preventing the second piston component 12 from becoming stuck or malfunctioning. Furthermore, when the second piston component 12 is assembled with the second piston housing 121 , a certain rotation angle can be maintained between the second piston component 12 and the second piston housing 121 , which facilitates assembly.

[0077] The minimum gap between the fourth transition surface 2214f and the inner wall of the second piston housing 121 is defined as γ4. It should be noted that the value of the aforementioned gap δ4 is not necessarily the larger the better. The range of the gap γ4 is greater than or equal to 0.3 mm and less than or equal to 0.5 mm.

[0078] The above-mentioned second sealing ring 2212B is specifically a non-standard Gly ring. Its thickness D is defined to satisfy the requirement that the size of D is 2.5 to 3 times of γ3, and the size of D is 2.5 to 3 times of γ4. The design of the second sealing ring 2212B and its third transition surface 2213c and fourth transition surface 2214f can avoid the second sealing ring 2212B from undergoing transitional stretching in the radial direction and causing permanent deformation, and make it easy to assemble the second piston component 12 to the second piston housing 121.

[0079] As shown in FIG5B , a second sealing groove 222b is defined on the outer wall of the second sleeve portion 222B of the second connecting member 222. An O-ring 216 is located in the second sealing groove 222b and abuts the second sleeve portion 222B and the second piston body 2211 in the radial direction of the second piston body 2212. The O-ring 216 also serves as a seal and isolates the fluid on both sides of the second piston member 12.

[0080] Each of the aforementioned transition surfaces may also be a combination of an inclined surface and a straight surface, or a combination of a curved surface and a straight surface. As shown in FIG2 and FIG5A to FIG5C , the first transition surface 2111c includes a first straight surface segment 2111M, which is connected to one end of the first inner wall surface 2111a. The second transition surface 2111f includes a second straight surface segment 2111N, which is connected to one end of the second inner wall surface 2111d. The third transition surface 2213c includes a third straight surface segment 2214M, which is connected to one end of the third inner wall surface 2213a. The fourth transition surface 2214f includes a fourth straight surface segment 2214N, which is connected to one end of the fourth inner wall surface 2214d. Along the length direction of the valve core 20, the length of each straight surface segment is greater than or equal to 0.8 mm and less than or equal to 1.5 mm. If the length of each straight section is too short, the strength of the aforementioned annular portions will be insufficient. If the length of each straight section is too long, the ease of assembly of each piston component and each corresponding piston housing component will be affected.

[0081] The above description is merely an example of a specific embodiment of the present invention and should not be construed as limiting the protection points of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A reversing valve, characterized in that: The main valve comprises a valve body assembly and a valve assembly, wherein the valve assembly is arranged in the inner cavity of the valve body assembly, the valve assembly comprises a valve core, a first piston assembly and a second piston assembly, wherein the first piston assembly is fixedly connected or position-limitedly connected to the valve core, and the second piston assembly is fixedly connected or position-limitedly connected to the valve core; The first piston assembly includes a first piston component, the first piston component includes a first piston body and a first sealing member, the outer wall of the first piston body includes a first receiving groove, the first sealing member is arranged in the first receiving groove, the first receiving groove includes a first bottom wall facing the inner wall of the valve body assembly, and the first sealing member abuts between the inner wall of the valve body assembly and the first bottom wall; The second piston assembly includes a second piston component, the second piston component includes a second piston body and a second sealing component, the outer wall of the second piston body includes a second accommodating groove, the second sealing component is arranged in the second accommodating groove, the second accommodating groove includes a second bottom wall facing the inner wall of the valve body assembly, and the second sealing component abuts between the inner wall of the valve body assembly and the second bottom wall.

2. The reversing valve according to claim 1, characterized in that: The first sealing component includes a first sealing ring and a first sealing ring, the first sealing ring abuts against the first bottom wall, the first sealing ring abuts against the inner wall of the first sealing ring, and the outer wall of the first sealing ring abuts against the inner wall of the valve body assembly.

3. The reversing valve according to claim 2, characterized in that: The second sealing component includes a second sealing ring and a second sealing ring, the second sealing ring abuts against the second bottom wall, the second sealing ring abuts against the inner wall of the second sealing ring, and the outer wall of the second sealing ring abuts against the inner wall of the valve body assembly.

4. The reversing valve according to claim 3, characterized in that: The material of the first sealing ring and the second sealing ring is plastic, and the material of the first sealing ring and the second sealing ring is rubber.

5. The reversing valve according to claim 3, characterized in that: The first piston body comprises a first annular portion and a second annular portion, the first annular portion comprises a first inner wall surface, a first outer wall surface and a first transition surface, the second annular portion comprises a second inner wall surface, a second outer wall surface and a second transition surface, the first inner wall surface and the second inner wall surface serve as at least part of the groove wall of the first accommodating groove, the diameter of one end of the first transition surface connected to the first outer wall surface is smaller than the diameter of one end of the first transition surface connected to the first inner wall surface, and the diameter of one end of the second transition surface connected to the second outer wall surface is smaller than the diameter of one end of the second transition surface connected to the second inner wall surface; The second piston body includes a third annular portion and a fourth annular portion, the third annular portion includes a third inner wall surface, a third outer wall surface and a third transition surface, the fourth annular portion includes a fourth inner wall surface, a fourth outer wall surface and a fourth transition surface, the third inner wall surface and the fourth inner wall surface serve as at least part of the groove wall of the second accommodating groove, the diameter of one end of the third transition surface connected to the third outer wall surface is smaller than the diameter of one end of the third transition surface connected to the third inner wall surface, and the diameter of one end of the fourth transition surface connected to the fourth outer wall surface is smaller than the diameter of one end of the fourth transition surface connected to the fourth inner wall surface.

6. The reversing valve according to claim 5, characterized in that: The first transition surface, the second transition surface, the third transition surface and the fourth transition surface include inclined surfaces or curved surfaces.

7. The reversing valve according to claim 5, characterized in that: In the length direction of the valve core, the first transition surface includes a first straight surface segment, the first straight surface segment is connected to one end of the first inner wall surface, and the length of the first straight surface segment is greater than or equal to 0.8 mm and less than or equal to 1.5 mm; In the length direction of the valve core, the second transition surface includes a second straight surface segment, the second straight surface segment is connected to one end of the second inner wall surface, and the length of the second straight surface segment is greater than or equal to 0.8 mm and less than or equal to 1.5 mm; In the length direction of the valve core, the third transition surface includes a third straight surface segment, the third straight surface segment is connected to one end of the third inner wall surface, and the length of the third straight surface segment is greater than or equal to 0.8 mm and less than or equal to 1.5 mm; In the length direction of the valve core, the fourth transition surface includes a fourth straight surface segment, the fourth straight surface segment is connected to one end of the fourth inner wall surface, and the length of the fourth straight surface segment is greater than or equal to 0.8 mm and less than or equal to 1.5 mm.

8. The reversing valve according to claim 7, characterized in that: The valve body assembly comprises a valve body, a first piston housing component, and a second piston housing component, and the valve core is located in the valve body; The first piston housing component comprises a first piston housing, the first piston housing is fixedly connected to the valve body, in the height direction of the valve core, the cross-sectional area of ​​the first piston housing is smaller than the cross-sectional area of ​​the valve body, the first piston body is located in the first piston housing, and the first sealing ring abutting against the inner wall of the first piston housing; The second piston shell component includes a second piston shell, which is fixedly connected to the valve body. In the height direction of the valve core, the cross-sectional area of ​​the second piston shell is smaller than the cross-sectional area of ​​the valve body. The second piston body is located in the second piston shell, and the second sealing ring abuts against the inner wall of the second piston shell.

9. The reversing valve according to claim 8, characterized in that: The first piston housing is cylindrical, and the second piston housing is cylindrical; The diameter of one end of the first transition surface connected to the first inner wall surface is smaller than the inner diameter of the first piston shell, and a first gap is provided between the first transition surface and the inner wall of the first piston shell; The diameter of one end of the second transition surface connected to the second inner wall surface is smaller than the inner diameter of the first piston shell, and a second gap is provided between the second transition surface and the inner wall of the first piston shell; The diameter of one end of the third transition surface connected to the third inner wall surface is smaller than the inner diameter of the second piston shell, and a third gap is provided between the third transition surface and the inner wall of the second piston shell; The diameter of one end of the fourth transition surface connected to the fourth inner wall surface is smaller than the inner diameter of the second piston shell, and a fourth gap is provided between the fourth transition surface and the inner wall of the second piston shell.

10. The reversing valve according to claim 8, characterized in that: The valve body, the first piston shell and the second piston shell are made of steel, and the first piston body and the second piston body are made of aluminum alloy.

11. The reversing valve according to claim 9, characterized in that: The first piston assembly is connected to the valve core in a limiting manner, the first piston assembly includes a first connecting member and a first limiting member, the first piston body is fixedly connected or limitedly connected to the first connecting member, the first limiting member is fixedly connected to the valve core, the first connecting member includes a first sleeve portion, a first main body portion and a first anti-slip portion, the first piston body is sleeved on the outer periphery of the first sleeve portion, the first main body portion is located between the first sleeve portion and the first anti-slip portion, the first main body portion is cylindrical, the first anti-slip portion is cylindrical, the first limiting member includes a first axial limiting portion and a first radial limiting portion, the first axial limiting portion is annular, the first radial limiting portion is cylindrical, and the first radial limiting portion extends from the first axial limiting portion toward the valve core direction; The first axial limiting portion is located at the outer periphery of the first main body, and the first radial limiting portion is at least partially located at the outer periphery of the first anti-slip portion. The inner diameter of the first axial limiting portion is defined as D1, the outer diameter of the first main body is defined as D2, the inner diameter of the first radial limiting portion is defined as D3, and the outer diameter of the first anti-slip portion is defined as D4. Then, D1>D2, D3>D4; The second piston assembly is limitedly connected to the valve core, the second piston assembly includes a second connecting piece and a second limiting piece, the second piston body is fixedly connected or limitedly connected to the second connecting piece, the second limiting piece is fixedly connected to the valve core, the second connecting piece includes a second sleeve portion, a second main body portion and a second anti-slip portion, the second piston body is sleeved on the outer periphery of the second sleeve portion, the second main body portion is located between the second sleeve portion and the second anti-slip portion, the second main body portion is cylindrical, the second anti-slip portion is cylindrical, the second limiting piece includes a second axial limiting portion and a second radial limiting portion, the second axial limiting portion is annular, the second radial limiting portion is cylindrical, and the second radial limiting portion extends from the second axial limiting portion toward the valve core direction; The second axial limiting portion is located at the outer periphery of the second main body portion, and the second radial limiting portion is at least partially located at the outer periphery of the second anti-slip portion. The inner diameter of the second axial limiting portion is defined as D1, the outer diameter of the second main body portion is defined as D2, the inner diameter of the second radial limiting portion is defined as D3, and the outer diameter of the first anti-slip portion is defined as D4. Then, D1>D2, D3>D4.

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