Reversing valve

Abstract

The utility model discloses a reversing valve which comprises a valve body part and a sliding valve part, the sliding valve part is located in a valve cavity of the valve body part, the valve body part comprises a main valve body and an end cover, and the end cover comprises a piston displacement part and a piston limiting part. The end cover further comprises a first base portion protruding from the piston limiting portion towards the side away from the main valve body, the first base portion comprises a cylinder portion, and the inner contour of the radial cross section of the cylinder portion is non-circular. According to the reversing valve, the inner contour of the cross section of the barrel part in the radial direction is non-circular, under the state that the peripheral part abuts against the piston limiting part, the base part is at least partially located on the inner side of the piston limiting part, and in the radial direction of the barrel part, a gap is formed between the peripheral face of the base part and the inner wall of the piston limiting part; therefore, when the piston assembly gets close to or abuts against the piston limiting part, the problem that the piston assembly interferes with the end cover in the moving process is solved, and meanwhile the reversing speed and the reversing reliability of the reversing valve are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigerant switching valves for refrigeration systems, and in particular to a reversing valve. Background Art

[0002] In the refrigeration system, the switching between cooling mode and heating mode is achieved through the reversing valve. Figure 11 A cross-sectional diagram of a reversing valve in the background art is shown in FIG. Figure 11 As shown, the reversing valve includes a main valve body, end covers 6 located at both ends of the main valve body, and a valve seat 5 in the valve cavity of the main valve body. A slider 2 and a connecting rod 3 cooperating with the slider 2 are provided in the valve body, and the end of the connecting rod 3 is connected to the piston assembly 4; the valve seat 5 contacts and supports the slider 2. Figure 12 Schematic diagram of a piston assembly used in a reversing valve in the background art, such as Figure 12 As shown, the piston assembly 4 includes a sealing bowl 41a and a base 41b connected to the bottom of the sealing bowl 41a. During the reversing process, the medium in the pilot valve enters the valve chamber to drive the piston 41 to push the connecting rod 3, and the connecting rod 3 drives the slider 2 to move in the valve chamber of the main valve body. In order to ensure the stable connection between the sealing bowl 41a, the base 41b and the connecting rod 3 on the piston 41, rivets, screws and other components are usually provided for fixing. The end cover 6 adopts an end cover with a circular cross-section. There is a gap between the inner wall of the end cover and the screws and rivets. If the gap is too small, the screws and rivets will interfere with the end cover during the movement of the piston assembly 41. If the gap is too large, the volume of the moving section of the piston assembly 41 in the displacement part of the valve chamber will increase. As a result, after the same mass and volume of fluid enters the valve chamber, the pressure difference force generated will decrease, which is not conducive to the reversing of the reversing valve. Utility Model Content

[0003] The utility model provides a reversing valve, which aims to solve the problem of interference between a piston assembly and an end cover during movement, while improving the reversing speed and reversing reliability of the reversing valve.

[0004] The utility model provides a reversing valve, comprising a valve body component and a sliding valve component, wherein the sliding valve component is located in the valve cavity of the valve body component, the sliding valve component comprises a connecting rod, a piston assembly, and a connecting piece, wherein the connecting piece is connected to the piston assembly, and the connecting piece is also connected to the piston assembly and the connecting rod, the valve body component comprises a main valve body and an end cover, the end cover comprises a piston displacement portion and a piston limiting portion, the end cover also comprises a first base protruding from the piston limiting portion toward the side away from the main valve body, the piston assembly is provided with a limiting portion at the end facing the first base side, and the limiting portion comprises an inner circumference The connecting part includes a base part, and the base part extends from the inner peripheral part toward the side away from the main valve body. The first base part includes a cylindrical part, and the inner contour of the cylindrical part in its radial cross section is non-circular; the piston assembly can be slidably matched with the piston displacement part, and the outer peripheral part can be abutted against the piston limiting part. When the outer peripheral part and the piston limiting part are abutted, at least part of the base part is located on the inner side of the piston limiting part, and in the radial direction of the cylindrical part, there is a gap between the outer peripheral surface of the base part and the inner wall of the piston limiting part.

[0005] The reversing valve provided in the present application has a non-circular inner contour of the radial cross section of the cylinder portion, and when the outer peripheral portion is in abutment against the piston limiting portion, the base portion is at least partially located on the inner side of the piston limiting portion, and in the radial direction of the cylinder portion, there is a gap between the outer peripheral surface of the base portion and the inner wall of the piston limiting portion. Therefore, when the piston assembly approaches or abuts against the piston limiting portion, the problem of interference between the piston assembly and the end cover during movement is solved, while the reversing speed and reversing reliability of the reversing valve are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 : A three-dimensional schematic diagram of the reversing valve provided by the utility model;

[0007] Figure 2 : A cross-sectional schematic diagram of the reversing valve provided by the utility model;

[0008] Figure 3 : A cross-sectional schematic diagram of the end cover in the first embodiment of the present utility model;

[0009] Figure 4 : A three-dimensional diagram of the end cover in the first embodiment of the present utility model;

[0010] Figure 5 : The utility model Figure 2 Schematic diagram of the cross section at AA in the middle;

[0011] Figure 6 : The utility model Figure 2 Schematic diagram at B in the middle;

[0012] Figure 7 : A cross-sectional schematic diagram of the end cover in the second embodiment provided by the present invention;

[0013] Figure 8 : A three-dimensional diagram of the end cover in the second embodiment provided by the present invention;

[0014] Figure 9 : A cross-sectional schematic diagram of the end cover in the third embodiment provided by the present invention;

[0015] Figure 10 : A three-dimensional diagram of the end cover in the third embodiment provided by the present invention;

[0016] Figure 11 : A cross-sectional schematic diagram of a reversing valve in the background art;

[0017] Figure 12 : Schematic diagram of a piston used in a reversing valve in the background technology.

[0018] Figures 1-9 The reference numerals in the figure are: 1-main valve body, 11-valve body, 110-inner cavity, 12-valve seat, 13-connecting pipe, 14-capillary tube, 15-bushing,

[0019] 2-end cover, 200-chamber, 2001-first cavity, 2002-second cavity, 201-piston limiter, 202-step portion,

[0020] 21-first base, 211-cylinder, 2111-outer protrusion, 2112-connecting portion, 21111-first matching section, 21112-second matching section, 21113 / 21113A / 21113B-first segment, 21114 / 21114A / 21114B-second segment, 21115 / 21115A / 21115B-third segment, 21116 / 21116A / 21116B-fourth segment, 2111A-fourth matching section, 2112A-third matching section, 2111B-fifth matching section, 2112B-sixth matching section, 212-sealing portion, 2121-transition portion, 2122-end portion, 213-side hole, 2131-support portion,

[0021] 22- second base,

[0022] 23- third base, 231- outer peripheral surface, 232- chamfered portion,

[0023] 3- sliding valve component, 31- valve core, 32- connecting rod, 33- piston assembly, 331- base, 3311- limiting part, 33111- inner peripheral part, 33112- outer peripheral part, 332- sealing bowl, 34- connecting piece, 341- first connecting piece, 3411- first screw, 3412- second screw, 342- second connecting piece, 3421- first rivet, 3422- second rivet, 35- base part, 351- first base part, 352- second base part, 353- third base part, 354- fourth base part,

[0024] 4-Pilot valve. DETAILED DESCRIPTION

[0025] In order to make those skilled in the art better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. Figure 2 The positions of the components shown in the figure are defined only for the clarity and convenience of expressing the technical solution. It should be understood that the directional words used in this article should not limit the scope of protection requested by this application.

[0026] Example 1:

[0027] Figure 1 A three-dimensional schematic diagram of the reversing valve provided by the utility model; Figure 2 A cross-sectional schematic diagram of the reversing valve provided by the utility model; Figure 3 This is a cross-sectional schematic diagram of the end cover in the first embodiment of the present utility model; Figure 4 A three-dimensional diagram of the end cover in the first embodiment of the present utility model; Figure 5 For this utility model Figure 2 Schematic diagram of the cross section at AA in the middle; Figure 6 For this utility model Figure 2 Schematic diagram of point B in the middle.

[0028] In this embodiment, the definition is as follows Figure 2 The axial direction of the valve body 11 and the axial direction of the end cover 2 are the transverse direction of the reversing valve, and the direction perpendicular to the axial direction of the valve body 11 is the longitudinal direction of the reversing valve.

[0029] As shown in the figure, the reversing valve of this embodiment is described by taking a stainless steel four-way reversing valve as an example. The reversing valve is installed in a refrigeration system and realizes the reversing of the reversing valve by pressure differential force. It includes a valve body component, a sliding valve component 3 and a pilot valve 4. The valve body component includes a main valve body 1 and an end cover 2. The pilot valve 4 is installed on the valve body 11. The operation of the reversing valve is controlled by the pilot valve 4. The main valve body 1 and the end cover 2 are made of stainless steel. The main valve body 1 includes a valve body 11 and a valve seat 12. The valve body 11 has an inner cavity 110. The valve seat 12 is fixed to the inner wall of the valve body 11. A pair of end covers 2 are provided, and the two end covers 2 are fixedly connected to the two axial ends of the valve body 11 (as shown in FIG. Figure 1-2 As shown), the end cover 2 has a chamber 200, and the inner cavity 110 and the chamber 200 constitute the valve cavity of the valve body component.

[0030] The sliding valve component 3 is located in the valve cavity of the valve body component. The sliding valve component 3 includes a valve core 31, a connecting rod 32 and a piston assembly 33. The valve core 31 is at least partially arranged in the inner cavity 110. The valve core 31 can slide relative to the valve seat 12. The connecting rod 32 is connected to the valve core 31 at its middle position along the transverse direction of the reversing valve. The piston assembly 33 corresponds to the number of the end cover 2 and is provided in a pair. At the same time, the piston assemblies 33 on both sides are respectively connected to the two side ends of the connecting rod 32, and the piston assembly 33 on the same side cooperates with the end cover 2 on the same side so that the piston assembly 33 is slidably arranged inside the corresponding position of the end cover 2. The piston assembly 33 includes a base 331 and a sealing bowl 332. The sealing bowl 332 divides the chamber 200 on both sides of the transverse direction of the reversing valve into a first cavity 2001 and a second cavity 2002. The first cavity 2001 is connected to the inner cavity 110. Therefore, the medium in the pilot valve 4 can push the connecting rod 32 through the piston assembly 33 to drive the valve core 31 to move. The sliding valve component 3 further includes a connecting member 34 , which includes a first connecting member 341 and a second connecting member 342 . The first connecting member 341 connects the piston assembly 33 and the connecting rod 32 , and the second connecting member 342 connects the base 331 and the sealing bowl 332 .

[0031] In this embodiment, the end cover 2 is cylindrical, and the end cover 2 includes a piston displacement portion and a piston limiting portion 201. The end cover 2 also includes a first base 21, and the first base 21 protrudes from the piston limiting portion 201 toward the side away from the main valve body 1. The base 331 is provided with a limiting portion 3311 at the end portion toward the side of the first base 21. The limiting portion 3311 includes an inner peripheral portion 33111 and an outer peripheral portion 33112. The connecting member 34 includes a base portion 35, and the base portion 35 is extended from the inner peripheral portion 33111 of the limiting portion 3311 toward the direction away from the main valve body 1. The first base portion 21 extends sideways, and includes a cylindrical portion 211 having a non-circular inner profile in its radial cross-section. The piston assembly 33 is capable of slidingly engaging with the piston displacement portion, and the outer peripheral portion 33112 is capable of abutting against the piston stop 201. When the outer peripheral portion 33112 abuts the piston stop 201, a portion of the base portion 35 is located inside the piston stop 201, a portion of the base portion 35 is also located within the inner cavity of the cylindrical portion 211, or the entire base portion 35 is located inside the piston stop. In the radial direction of the cylindrical portion 211, a gap a is defined between the outer peripheral surface of the base portion 35 and the inner wall of the piston stop 201. The presence of gap a allows the piston assembly 33 to move to the abutment state of the outer peripheral portion 33112 against the piston stop 201, preventing interference between the base portion 35 of the connector 34 and the inner wall of the piston stop 201, while ensuring that the reversing valve can be properly switched. Depending on the actual length of the base portion 35, when the outer peripheral portion 33112 and the piston limit portion 201 are in contact with each other, a portion of the base portion 35 can be located in the inner cavity of the cylinder portion 211. Similarly, in the radial direction of the cylinder portion 211, there is a gap between the outer peripheral surface of the base portion 35 and the inner wall of the cylinder portion 211. This gap can avoid interference between the base portion 35 and the inner wall of the cylinder portion 211, thereby further ensuring that the reversing valve is in place when reversing.

[0032] In this embodiment, in the axial projection direction of the end cover 2, the projection surface of the inner wall contour of the cylinder portion 211 is all located on the projection surface of the base 331. It can be understood that if the area of ​​the inner contour of the projection surface of the cylinder portion 211 is smaller on the projection surface of the base 331, under the condition of unchanged pressure, the pressure of the fluid borne by the corresponding second cavity 2002 will also be greater, so that the thrust for pushing the piston assembly 33 to slide in the end cover 2 is increased, thereby improving the switching reliability of the reversing valve.

[0033] In order to avoid the problem of interference between the end cover 2 and the piston assembly 33 due to the inner wall cross-section size of the cylinder part 211 being too small, the minimum inner wall spacing of the cylinder part 211 in the radial direction is smaller than the maximum outer surface spacing between the base parts 35 in the diagonal direction, in this embodiment, the cylinder part 211 includes an outer protrusion 2111 and a connecting part 2112. In the radial direction of the cylinder part 211, the connecting part 2112 connects adjacent outer protrusions 2111; the piston limit part 201 is located at the cylinder part 21 1 has a circular radial cross-section. The end of the cylindrical portion 211 close to the main valve body 1 is connected to the piston limit portion 201. The outer protrusion 2111 and the connecting portion 2112 extend from the piston limit portion 201 in a direction away from the main valve body 1. To ensure that the base portion 35 has sufficient accommodation space in the longitudinal direction of the reversing valve when the outer peripheral portion 33112 abuts against the piston limit portion 201, the length of the outer protrusion 2111 and the connecting portion 2112 in the longitudinal direction of the reversing valve is greater than the length of the base portion 35 in the longitudinal direction. The outer wall of the piston limiting portion 201 has an outer edge portion, the maximum distance between the inner wall of the outer protrusion 2111 and the outer edge portion is a first distance, and the maximum distance between the inner wall of the connecting portion 2112 and the outer edge portion is a second distance, then the second distance is greater than the first distance. Therefore, under the premise of further increasing the interval a, it can be ensured that the piston limiting portion 201 has sufficient contact surface to offset the outer peripheral portion 33112 during reversing, and at the same time, the contact surface is more concentrated in the area between the outer edge portion of the piston limiting portion 201 and the inner wall of the connecting portion 2112.

[0034] In this embodiment, the outer protrusion 2111 and the connecting portion 2112 extend from the piston limiting portion 201 in a direction away from the main valve body 1, and the outer protrusion 2111 and the connecting portion 2112 are extended to the head portion 212. While facilitating the processing and forming of the first base portion 21, the cross-section of the cylindrical portion 211 at different longitudinal positions is non-circular. Therefore, compared with the cylindrical structure, it can withstand greater fluid pressure, thereby ensuring that the strength of each part of the end cover 2 can be effectively guaranteed.

[0035] like Figure 5 From the perspective shown in , the convex portion 2111 protrudes radially away from the center of the cylindrical portion 211, while the middle section of the connecting portion 2112 includes an outward convex structure, an inward concave structure, or a planar structure. It should be noted that when the connecting portion 2112 adopts a non-planar structure, it has a larger contact area than a planar structure, which will increase the strength of the end cap 2.

[0036] In this embodiment, Figure 3-5 As shown, the outer protrusion 2111 includes a first matching section 21111 and a second matching section 21112. Based on this, the barrel portion 211 is as shown in FIG. Figure 5The cross-section under the viewing angle is roughly square, and its corners are roughly arc-shaped, and the arc shape is the above-mentioned first matching segment 21111 and the second matching segment 21112. The first matching segment 21111 and the second matching segment 21112 are connected by a connecting portion 2112. The first connecting member 341 includes a first screw 3411 and a second screw 3412. The first screw 3411 and the second screw 3412 are arranged diagonally. The base portion 35 has a first base portion 351 and a second base portion 352. The first base portion 351 serves as the head of the first screw 3411, and the second base portion 352 serves as the head of the second screw 3412. The first matching section 21111 has a first segment 21113 and a second segment 21114, and the first segment 21113 and the second segment 21114 are arranged diagonally. When the outer peripheral portion 33112 and the piston limit portion 201 are in contact with each other, the first base portion 351 corresponds to the first segment 21113 in the radial direction of the cylinder portion 211, and the second base portion 352 corresponds to the second segment 21114 in the radial direction of the cylinder portion 211. The distance between the outer peripheral surface of the first base portion 351 and the inner wall of the first segment 21113 and the distance between the outer peripheral surface of the second base portion 352 and the inner wall of the second segment 21114 are the first spacings. a1, the first spacing a1 can prevent the screw from interfering with the inner wall of the cylinder portion 211 and the inner wall of the piston limit portion 201; the second connecting member 342 includes a first rivet 3421 and a second rivet 3422, the first rivet 3421 and the second rivet 3422 are arranged diagonally, the base portion 35 has a third base portion 353 and a fourth base portion 354, the third base portion 353 serves as the head of the first rivet 3421, and the fourth base portion 354 serves as the head of the second rivet 3422, the second matching segment 21112 has a third segment 21115 and a fourth segment 21116, the third segment 21115 and the fourth segment 21116 are arranged diagonally, and the second matching segment 21112 includes a third segment 21115 and a fourth segment 21116. The four segments 21116 are arranged diagonally. When the outer peripheral portion 33112 and the piston limit portion 201 are in a state of abutment with each other, the third base portion 353 corresponds to the third segment 21115 in the radial direction of the cylinder portion 211, and the fourth base portion 354 corresponds to the fourth segment 21116 in the radial direction of the cylinder portion 211. The distance between the outer peripheral surface of the third base portion 353 and the inner wall of the third segment 21115, and the distance between the outer peripheral surface of the fourth base portion 354 and the inner wall of the fourth segment 21116 is the second spacing a2. The second spacing a2 can prevent the rivet from interfering with the inner wall of the cylinder portion 211 and the inner wall of the piston limit portion 201.

[0037] Based on the above content, the cylindrical portion 211 avoids interference with the first connecting member 341 through the first matching segment 21111 and avoids interference with the second connecting member 342 through the second matching segment 21112. The radial cross-section of the first matching segment 21111 and the second matching segment 21112 in the cylindrical portion 211 is as follows: Figure 5The arc structure is shown in the perspective, and the arc structure can be adapted to the outer peripheral surface of the base portion of the connecting member 34. The connecting portion 2112 is provided with multiple segments, and the segments are connected in the circumferential direction of the first base portion 21, and the corresponding connecting portion 2112 can be as follows Figure 5 The arc-shaped structure under the perspective shown. The non-circular cross-section of the cylindrical portion 211 can further ensure the strength of the end cover 2.

[0038] Therefore, on the premise that the various performances of the reversing valve meet the basic performance requirements, this embodiment reduces its cost by compacting the structure of its end cover 2, and reasonably solves the interference problem between the first base 21 and the base 35 of the screws and rivets when the reversing valve is reversed, thereby improving the reversing speed and reversing reliability of the reversing valve.

[0039] In this embodiment, the first base portion 21 further includes a sealing portion 212, which is connected to the end of the cylinder portion 211 away from the main valve body 1. The sealing portion 212 includes a transition portion 2121 and a cover portion 2122, which is connected to the end of the transition portion 2121 away from the main valve body 1. Figure 4-5 As shown, the cross section of the cover portion 2122 in the radial direction of the cylindrical portion 211 is an arc shape, that is, Figure 4 The cross section is arc-shaped from the perspective, and the cover 2122 protrudes toward the inner cavity of the cylinder 211. The shape of the cover 2122 can increase the contact area between the head portion 212 and the fluid, thereby reducing or avoiding the expansion of the head portion 212 caused by the change of fluid pressure during the reversing process, and ensuring the overall stability of the first base 21 during the continuous pressurization of the reversing valve to the second cavity 2002. Figure 3 The cross section under the viewing angle is an outer arc, and the transition portion 2121 of this structure can further increase the contact area with the fluid medium, while also avoiding stress concentration.

[0040] In this embodiment, in order to simplify the forming and processing of the end cover 2, separate base welding or integrated material stretching can be used.

[0041] When the end cover 2 adopts a two-stage structure, the two-stage structure can be formed by stretching or welding. Specifically, the end cover 2 further includes a second base 22, the second base 22 is cylindrical, and the second base 22 serves as the piston displacement portion, and the movable stroke of the piston assembly 33 in the inner cavity of the second base 22 is H (such as Figure 3(as shown in ); the piston assembly 33 can slide within the inner cavity of the second base portion 22 to switch the direction. The inner diameter of the second base portion 22 is larger than the inner dimensions of the first base portion 21, and a step is defined between the second base portion 22 and the first base portion 21, which serves as the piston stop 201. Therefore, when the reversing valve switches direction, the switching between the cooling mode and the heating mode is completed when the stop 3311 of the base 331 abuts the piston stop 201 as the piston assembly 33 moves.

[0042] It should be noted that the inner diameter of the second base 22 corresponds to the thrust of the piston assembly 33. It is necessary not only to avoid excessively reducing the inner diameter of the second base 22 to reduce material costs, resulting in a compact structure and interference between the end cover 2 and the piston assembly 33, but also to avoid excessively expanding the inner diameter of the second base 22 to increase material costs. The inner diameter of the second base 22 is smaller than the inner diameter of the valve body 11. Correspondingly, in order to ensure that the piston assembly 33 has good switching performance, while reducing the cross-sectional area of ​​the second base 22 in the longitudinal section, it is also necessary to further reduce the cross-sectional area of ​​the first base 21 in the longitudinal section, so as to reduce the friction between the two when reducing the contact area between the piston assembly 33 and the inner wall of the second base 22.

[0043] In this embodiment, the reversing valve further includes a capillary tube 14. A support portion 2131 is provided within the connecting portion 2112. The support portion 2131 defines a side hole 213. A bushing 15 is connected to the inner wall of the side hole 213, which is engaged with the capillary tube 14. The outer surface of the bushing 15 is fixedly connected to the inner wall of the support portion 2131. This increases the contact area between the end cap 2 and the capillary tube 14 and improves the connection strength. Simultaneously, the capillary tube 14 connects the valve body 11 and the end cap 2 of the reversing valve via the capillary tube 14, ultimately converging onto the pilot valve 4 to form a complete circuit. The end caps 2 are press-fitted onto both sides of the valve body 11 and welded together, connecting the valve body 11 and the chamber 200 within the reversing valve to form a closed chamber. When refrigerant enters, a pressure differential is generated, pushing the piston assembly 33 and the valve core 31 to slide left and right, thereby switching between cooling and heating modes.

[0044] It can be understood that, when the length of the reversing valve is the same, the smaller the longitudinal cross-sectional area of ​​the inner cavity of the valve body component, the smaller the volume of the inner cavity of the valve body component, then when the movement distance of the piston assembly 33 is the same, the volume of the space between the second cavity 2002 and the limiting portion 3311 of the base 331 is reduced, and the amount of fluid medium entering the end cover 2 through the capillary 14 can also be reduced accordingly, thereby improving the reversing speed and reversing reliability of the reversing valve.

[0045] In this embodiment, the end cover 2 preferably adopts a three-section structure, and the three-section structure can be preferably welded. When the end cover 2 is a three-section structure, specifically, the end cover 2 also includes a third base 23, the third base 23 is cylindrical, and the end of the third base 23 away from the main valve body 1 is connected to the second base 22. The inner diameter of the third base 23 is larger than the inner diameter of the second base 22, and the third base 23 is fixedly connected to the main valve body 1. In order to make the end cover 2 more sealed, as shown in FIG. Figure 3 As shown, the first base portion 21 , the second base portion 22 and the third base portion 23 are an integrally formed structure.

[0046] Specifically, an outer ring surface 231 is provided on the outside of the third base 23, and the outer ring surface 231 cooperates with the inner wall of the main valve body 1. A chamfered portion 232 is provided on the end of the third base 23 away from the second base 22, and the chamfered portion 232 is connected to the outer ring surface 231. The end cover 2 needs to be welded after being assembled on the valve body 11, so the outer ring surface 231 is at least partially connected to the inner wall of the valve body 11. At this time, the outer ring surface 231 of the third base 23 has a long straight section in the axial direction of the valve body 11, so that the end cover 2 and the valve body 11 have better coaxiality, so as to better realize the left and right reversing function of the reversing valve. The chamfered portion 232 is Figure 3-4 The cross-section of the end cap 2 is an inclined plane, and the chamfered portion 232 of the end cap 2 facilitates smoother installation and insertion of the third base portion 23 into the inner cavity 110 of the valve body 11. The portion of the third base portion 23 inserted into the valve body 11 is welded to the inner wall of the valve body 11 to strengthen the connection between the end cap 2 and the valve body 11. Of course, this is not limited to this embodiment; the third base portion 23 may also be connected to the valve body 11 using other methods.

[0047] On the basis of the three-section structure of the end cover 2, a step portion 202 is provided at the connection between the second base portion 22 and the third base portion 23. The end surface of the step portion 202 close to the second base portion 22 is inclined, and an angle b is formed between the step portion 202 and the inner wall of the second base portion 22. Figure 3 From a visual perspective, the end of the step portion 202 connected to the third base portion 23 is closer to the valve body 11 than the end of the step portion 202 connected to the second base portion 22, and the included angle b satisfies 90°<b<110°. The included angle b is preferably 100°. The inclined step portion 202 further ensures the strength of the end cap 2 at this position.

[0048] Example 2:

[0049] Figure 7 This is a cross-sectional schematic diagram of the end cover in the second embodiment provided by the utility model; Figure 8 This is a three-dimensional diagram of the end cover in the second embodiment provided by the utility model.

[0050] Figure 7-8As shown, the second embodiment is a partial change made on the basis of the first embodiment, mainly reflected in the different structural design of the barrel portion 211. In this embodiment, based on the dimensions of the second connecting member 342 and the first connecting member 341, the diameter of the rivet end is often larger than the diameter of the screw. Therefore, it is possible to selectively avoid interference between the rivet and the barrel portion 211. On this basis, it is also necessary to avoid interference between the screw and the barrel portion 211. This prevents interference between the piston assembly 33 and the end cover 2 during movement, while improving the switching speed and switching reliability of the reversing valve.

[0051] In this embodiment, the cylindrical portion 211 is as follows Figure 6The cross-section under the viewing angle is roughly circular, the connecting portion 2112 includes a third matching segment 2112A, and the third matching segment 2112A is more protruding toward the outside than the connecting portion 2112 described in the first embodiment. The first connecting member 341 includes a first screw 3411 and a second screw 3412, and the first screw 3411 and the second screw 3412 are arranged diagonally. The base portion 35 has a first base portion 351 and a second base portion 352, the first base portion 351 serves as the head of the first screw 3411, and the second base portion 352 serves as the head of the second screw 3412. The third matching segment 2112A has a first segment 21113A and a second segment 21114A. The first segment 21111 is a plurality of first and second second segments 21115A. 113A and the second segment 21114A are arranged diagonally. When the outer peripheral portion 33112 and the piston limit portion 201 are in contact with each other, the first base portion 351 corresponds to the first segment 21113A in the radial direction of the cylinder portion 211, and the second base portion 352 corresponds to the second segment 21114A in the radial direction of the cylinder portion 211. The distance between the outer peripheral surface of the first base portion 351 and the inner wall of the first segment 21113A and the outer peripheral surface of the second base portion 352 and the inner wall of the second segment 21114A is a third spacing. Although the third spacing is not clearly indicated in the figure, it corresponds to the meaning expressed by the first spacing described in Example 1. The third spacing can prevent the screw from interfering with the cylinder. The inner wall of the body 211 interferes with the inner wall of the piston limit portion 201; the outer protrusion 2111 includes a fourth matching segment 2111A, the second connecting member 342 includes a first rivet 3421 and a second rivet 3422, the first rivet 3421 and the second rivet 3422 are arranged diagonally, the base portion 35 has a third base portion 353 and a fourth base portion 354, the third base portion 353 serves as the head of the first rivet 3421, and the fourth base portion 354 serves as the head of the second rivet 3422, the fourth matching segment 2111A has a third segment 21115A and a fourth segment 21116A, the third segment 21115A and the fourth segment 21116A are arranged diagonally, and the third base portion 353 and the fourth base portion 354 are arranged diagonally. The base portion 353 corresponds to the third segment 21115A in the radial direction of the cylindrical portion 211, and the fourth base portion 354 corresponds to the fourth segment 21116A in the radial direction of the cylindrical portion 211. When the outer peripheral portion 33112 and the piston limiting portion 201 are in a state of abutment with each other, the distance between the outer peripheral surface of the third base portion 353 and the inner wall of the third segment 21115A, and the distance between the outer peripheral surface of the fourth base portion 354 and the inner wall of the fourth segment 21116A is a fourth spacing. Although the fourth spacing is not clearly indicated in the figure, it corresponds to the meaning expressed by the second spacing described in Example 1. The fourth spacing can prevent the rivet from interfering with the inner wall of the cylindrical portion 211 and the inner wall of the piston limiting portion 201.

[0052] Based on the above, the radial cross section of the third matching segment 2112A in the cylindrical portion 211 is as follows: Figure 5The fourth matching segment 2111A has an arc-shaped structure in the radial direction of the cylindrical portion 211. Figure 5 From the perspective shown, the structure is arc-shaped, with the arc center of the fourth mating segment 2111A and the arc center of the third mating segment 2112A not co-located. The third mating segment 2112A, while avoiding interference with the screw, further increases the distance between the inner wall of the third mating segment 2112A and the inner wall of the second base portion 22 compared to the first embodiment. This increases the contact area between the piston stop 201 and the outer peripheral portion 33112, improving stability during reversing. Furthermore, the non-circular cross-section of the cylindrical portion 211 further enhances the strength of the end cap 2.

[0053] Example 3:

[0054] Figure 9 A cross-sectional schematic diagram of an end cover in a third embodiment provided by the present utility model; Figure 10 This is a three-dimensional diagram of the end cover in the third embodiment provided by the utility model.

[0055] Figure 9-10 As shown, the second embodiment is a partial change made on the basis of the first embodiment, which is mainly reflected in the structural design of the different shape of the barrel portion 211.

[0056] In this embodiment, the cylindrical portion 211 is as follows Figure 6The cross-section is roughly circular from the perspective. The outer protrusion 2111 includes a fifth matching segment 2111B and a sixth matching segment 2112B. The fifth matching segment 2111B and the sixth matching segment 2112B protruding outward are provided on the above circular structure. The fifth matching segment 2111B and the sixth matching segment 2112B are connected by a connecting portion 2112. The first connecting member 341 includes a first screw 3411 and a second screw 3412. The first screw 3411 and the second screw 3412 are arranged diagonally. The base portion 35 has a first base portion 351 and a second base portion 352. The first base portion 351 serves as the head of the first screw 3411 and the second screw 3412 serves as the base portion. The base portion 352 serves as the head of the second screw 3412. The fifth matching segment 2111B includes a first segment 21113B and a second segment 21114B. The first segment 21113B and the second segment 21114B are arranged diagonally. When the outer peripheral portion 33112 and the piston limiting portion 201 are in contact with each other, the first base portion 351 corresponds to the first segment 21113B in the radial direction of the cylinder portion 211, and the second base portion 352 corresponds to the second segment 21114B in the radial direction of the cylinder portion 211. The outer peripheral surface of the first base portion 351 is aligned with the inner wall of the first segment 21113B, and the outer peripheral surface of the second base portion 352 is aligned with the second segment 21114B. The distance between the inner walls of 1114B is the fifth spacing, and the fifth spacing prevents the screw from interfering with the inner wall of the cylinder portion 211 and the inner wall of the piston limit portion 201; the second connecting member 342 includes a first rivet 3421 and a second rivet 3422, and the first rivet 3421 and the second rivet 3422 are arranged diagonally. The base portion 35 has a third base portion 353 and a fourth base portion 354, and the third base portion 353 serves as the head of the first rivet 3421, and the fourth base portion 354 serves as the head of the second rivet 3422. The second matching segment 21112 has a third segment 21115B and a fourth segment 21116B, and the third segment 21115B and the fourth segment 21116B are arranged diagonally. When the outer peripheral portion 33112 and the piston limiting portion 201 are in a state of being in contact with each other, the third base portion 353 corresponds to the third segment 21115B in the radial direction of the cylinder portion 211, and the fourth base portion 354 corresponds to the fourth segment 21116B in the radial direction of the cylinder portion 211. The distance between the outer peripheral surface of the third base portion 353 and the inner wall of the third segment 21115B and the distance between the outer peripheral surface of the fourth base portion 354 and the inner wall of the fourth segment 21116B are the sixth spacing. The sixth spacing can prevent the rivet from interfering with the inner wall of the cylinder portion 211 and the inner wall of the piston limiting portion 201.

[0057] The fifth matching segment 2111B and the sixth matching segment 2112B are different from the first matching segment 21111 and the second matching segment 21112 in the first embodiment in that the fifth matching segment 2111B and the sixth matching segment 2112B are as follows: Figure 8The cross section under the viewing angle shown is concave, and the angle of the concave is transitioned by an arc, and the corresponding connecting portion 2112B is as shown in FIG. Figure 6 The cross section under the perspective shown can also be arc-shaped. The above-mentioned concave structure can also prevent the base portion 35 of the connecting member 34 from interfering with the inner wall of the cylinder portion 211, thereby solving the problem of interference between the piston assembly 33 and the end cover 2 during movement, while improving the switching speed and switching reliability of the reversing valve.

[0058] 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.

[0059] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the concept of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A reversing valve, characterized in that: The invention comprises a valve body component and a sliding valve component (3), wherein the sliding valve component (3) is located in the valve cavity of the valve body component, wherein the sliding valve component (3) comprises a connecting rod (32), a piston assembly (33), and a connecting piece (34), wherein the connecting piece (34) connects the piston assembly (33), and the connecting piece (34) further connects the piston assembly (33) and the connecting rod (32), wherein the valve body component comprises a main valve body (1) and an end cover (2), wherein the end cover (2) comprises a piston displacement portion and a piston limiting portion (201), wherein the end cover (2) further comprises a first base portion (21) protruding from the piston limiting portion (201) toward a side away from the main valve body (1), wherein a limiting portion (3311) is provided at an end portion of the piston assembly (33) toward the first base portion (21), wherein the limiting portion (3311) comprises an inner peripheral portion (33111) and an outer peripheral portion (33111). 3112), the connecting member (34) includes a base portion (35), the base portion (35) extends from the inner peripheral portion (33111) toward the side away from the main valve body (1), the first base portion (21) includes a cylindrical portion (211), and the inner contour of the cylindrical portion (211) in its radial cross section is non-circular; the piston assembly (33) can be slidably matched with the piston displacement portion, and the outer peripheral portion (33112) can be abutted against the piston limiting portion (201), and when the outer peripheral portion (33112) and the piston limiting portion (201) are in abutting state, the base portion (35) is at least partially located on the inner side of the piston limiting portion (201), and in the radial direction of the cylindrical portion (211), there is a gap (a) between the outer peripheral surface of the base portion (35) and the inner wall of the piston limiting portion (201).

2. The reversing valve according to claim 1, characterized in that: The cylinder portion (211) includes an outer convex portion (2111) and a connecting portion (2112), and in the radial direction of the cylinder portion (211), the connecting portion (2112) connects the adjacent outer convex portions (2111); the cross-section of the piston limiting portion (201) in the radial direction of the cylinder portion (211) is annular, and the end of the cylinder portion (211) close to the main valve body (1) is connected to the piston limiting portion (201), and the outer convex portion (2111) and the connecting portion (2112) extend from the piston limiting portion (201) in a direction away from the main valve body (1); the outer wall of the piston limiting portion (201) has an outer edge portion, and the maximum distance between the inner wall of the outer convex portion (2111) and the outer edge portion is a first distance, and the maximum distance between the inner wall of the connecting portion (2112) and the outer edge portion is a second distance, so that the second distance is greater than the first distance.

3. The reversing valve according to claim 2, characterized in that: The outer protrusion (2111) includes a first matching section (21111) and a second matching section (21112), the first matching section (21111) and the second matching section (21112) are connected via the connecting section (2112), the connecting member (34) includes a first connecting member (341), the first connecting member (341) includes a first screw (3411) and a second screw (3412), the first screw (3411) and the second screw (3412) are arranged diagonally, the base portion (35) includes a first base portion (351) and a second base portion (352), the first base portion (351) serves as the first screw (3411) The head of the second base portion (352) serves as the head of the second screw (3412), the first matching section (21111) has a first segment (21113) and a second segment (21114), and when the outer peripheral portion (33112) and the piston limiting portion (201) are in abutment with each other, the first base portion (351) corresponds to the first segment (21113) in the radial direction of the cylinder portion (211), the second base portion (352) corresponds to the second segment (21114) in the radial direction of the cylinder portion (211), the outer peripheral surface of the first base portion (351) is aligned with the inner wall of the first segment (21113) and the second base portion (21114). The distance between the outer peripheral surface of the part (352) and the inner wall of the second segment (21114) is a first spacing (a1); the connecting member (34) further includes a second connecting member (342), the second connecting member (342) includes a first rivet (3421) and a second rivet (3422), the first rivet (3421) and the second rivet (3422) are arranged diagonally, the base portion (35) has a third base portion (353) and a fourth base portion (354), the third base portion (353) serves as the head of the first rivet (3421), the fourth base portion (354) serves as the head of the second rivet (3422), and the second matching segment (21114) is provided with a plurality of connecting members. 1112) has a third segment (21115) and a fourth segment (21116), and when the outer peripheral portion (33112) and the piston limiting portion (201) are in a state of abutment with each other, the third base portion (353) corresponds to the third segment (21115) in the radial direction of the cylinder portion (211), and the fourth base portion (354) corresponds to the fourth segment (21116) in the radial direction of the cylinder portion (211), and the distance between the outer peripheral surface of the third base portion (353) and the inner wall of the third segment (21115), and the distance between the outer peripheral surface of the fourth segment (21116) and the inner wall of the fourth segment (21116) is a second spacing (a2).

4. The reversing valve according to claim 2, characterized in that: The connecting portion (2112) includes a third matching section (2112A), the connecting member (34) includes a first connecting member (341), the first connecting member (341) includes a first screw (3411) and a second screw (3412), the first screw (3411) and the second screw (3412) are arranged diagonally, the base portion (35) includes a first base portion (351) and a second base portion (352), the first base portion (351) serves as the head of the first screw (3411), the second base portion (352) serves as the head of the second screw (3412), the third matching section (2112A) has a first base portion (351) and a second base portion (352), the first base portion (351) serves as the head of the first screw (3411), and the second base portion (352) serves as the head of the second screw (3412). A first segment (21113A) and a second segment (21114A), when the outer peripheral portion (33112) and the piston limiting portion (201) are in a state of abutment, the first base portion (351) corresponds to the first segment (21113A) in the radial direction of the cylinder portion (211), the second base portion (352) corresponds to the second segment (21114A) in the radial direction of the cylinder portion (211), and the distance between the outer peripheral surface of the first base portion (351) and the inner wall of the first segment (21113A), and the distance between the outer peripheral surface of the second base portion (352) and the inner wall of the second segment (21114A) is a third spacing The connecting member (34) further comprises a second connecting member (342), the outer protrusion (2111) comprises a fourth matching segment (2111A), the second connecting member (342) comprises a first rivet (3421) and a second rivet (3422), the first rivet (3421) and the second rivet (3422) are arranged diagonally, the base portion (35) comprises a third base portion (353) and a fourth base portion (354), the third base portion (353) serves as the head of the first rivet (3421), the fourth base portion (354) serves as the head of the second rivet (3422), and the fourth matching segment (2111A) comprises The third segment (21115A) and the fourth segment (21116A), the third base portion (353) corresponds to the third segment (21115A) in the radial direction of the cylindrical portion (211), and the fourth base portion (354) corresponds to the fourth segment (21116A) in the radial direction of the cylindrical portion (211). When the outer peripheral portion (33112) and the piston limiting portion (201) are in a state of abutment with each other, the distance between the outer peripheral surface of the third base portion (353) and the inner wall of the third segment (21115A), and the distance between the outer peripheral surface of the fourth base portion (354) and the inner wall of the fourth segment (21116A) is a fourth spacing.

5. The reversing valve according to any one of claims 2 to 4, characterized in that: The first base (21) further comprises a sealing portion (212), wherein the sealing portion (212) is connected to the end of the barrel portion (211) away from the main valve body (1), and the sealing portion (212) comprises a transition portion (2121) and a cover portion (2122), wherein the cover portion (2122) protrudes toward the inner cavity of the barrel portion (211), and the cover portion (2122) is connected to the end of the transition portion (2121) away from the main valve body (1).

6. The reversing valve according to claim 5, characterized in that: The end cover (2) further comprises a second base (22), which is cylindrical and serves as the piston displacement portion; the inner diameter of the second base (22) is larger than the inner size of the first base (21), and a step is provided between the second base (22) and the first base (21), and the step serves as the piston limit portion (201).

7. The reversing valve according to claim 6, characterized in that: The end cover (2) further comprises a third base (23), the end of the third base (23) away from the main valve body (1) is connected to the second base (22), the inner diameter of the third base (23) is larger than the inner diameter of the second base (22), and the third base (23) is fixedly connected to the main valve body (1).

8. The reversing valve according to claim 7, characterized in that: The third base (23) is provided with an outer annular surface (231) on the outside, and the outer annular surface (231) cooperates with the inner wall of the main valve body (1). The end of the third base (23) away from the second base (22) is provided with a chamfered portion (232), and the chamfered portion (232) is connected to the outer annular surface (231).

9. The reversing valve according to claim 7, characterized in that: A step portion (202) is provided at the connection between the second base portion (22) and the third base portion (23), and an angle (b) is formed between the step portion (202) and the inner wall of the second base portion (22), and the angle (b) satisfies 90°<b<110°.

10. The reversing valve according to any one of claims 2 to 9, characterized in that: The main valve body (1) and the end cover (2) are made of stainless steel. The end cover (2) and the main valve body (1) are welded and fixed. The reversing valve also includes a pilot valve (4) and a capillary tube (14). A support portion (2131) is provided in the connecting portion (2112). The support portion (2131) is provided with a side hole (213). The inner wall of the side hole (213) is connected to a bushing (15) connected to the capillary tube (14). The capillary tube is connected between the valve body component and the pilot valve (4). (14), the sliding valve component (3) also includes a valve core (31), and the valve core (31) is connected to the connecting rod (32); the piston assembly (33) includes a base (331) and a sealing bowl (332), and the connecting member (34) includes a first connecting member (341) and a second connecting member (342), the first connecting member (341) connects the piston assembly (33) and the connecting rod (32), and the second connecting member (342) connects the base (331) and the sealing bowl (332).

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