Reversing valve and refrigerating system

Abstract

The reversing valve comprises a valve body and end covers arranged at the two ends of the valve body, the end covers are fixedly connected with the valve body, the valve body comprises a first plane portion and a second plane portion, the first plane portion and the second plane portion are oppositely arranged and parallel, and the first plane portion and the second plane portion are fixedly connected with the valve body. The valve body comprises a first cambered surface part and a second cambered surface part which are oppositely arranged, the end cover comprises a first barrel body, the first barrel body comprises a piston cavity, a piston is arranged in the piston cavity, and the shape of the cross section of the first barrel body is consistent with that of the cross section of the valve body; and the cross section area of the inner cavity of the first barrel body is smaller than that of the inner cavity of the valve body. The reversing valve can effectively solve the problem of stress concentration, and the product design cost can be further reduced.

Description

Technical Field

[0001] The utility model relates to a switching valve used in the field of refrigeration technology, in particular to a reversing valve. The utility model also relates to a refrigeration system provided with the reversing valve. Background Art

[0002] There are many types of reversing valves. Among them, the cross-section of the middle section of one type of reversing valve is a quasi-square structure, and the cross-sections of the piston chambers of the two end covers on both sides are circular structures. During operation, the reversing valve switches high and low pressures through a pilot valve, thereby changing the pressure difference direction between the piston chambers on the left and right sides of the reversing valve, and pushing the piston to complete the left or right reversing action.

[0003] Since the valve body has a square cross-section structure, while the end cover piston chamber has a circular structure, to ensure sufficient overlap at the circular and square joint positions, the square needs to be larger than the circular diameter, so the design of the valve body will be relatively large. At the same time, the minimum overlap position at the joint of the circular end cover and the square valve body will form stress concentration under the action of internal pressure, resulting in fatigue failure at this position during the pressure fatigue durability test and unable to meet the design requirements. Summary of the Utility Model

[0004] The purpose of this technical solution is to provide a reversing valve to solve the above technical problems.

[0005] Another purpose of this technical solution is to provide a refrigeration system provided with the reversing valve.

[0006] The reversing valve provided by this technical solution includes a valve body and end covers provided at both ends of the valve body. Each end cover is fixedly connected to the valve body. The valve body includes a first plane portion and a second plane portion that are oppositely arranged and parallel. The valve body includes a first arc surface portion and a second arc surface portion that are oppositely arranged. The end cover includes a first cylinder body. The first cylinder body includes a piston chamber, and a piston is provided in the piston chamber. The cross-sectional shape of the first cylinder body is consistent with the cross-sectional shape of the valve body, and the cross-sectional area of the inner cavity of the first cylinder body is smaller than the cross-sectional area of the inner cavity of the valve body.

[0007] The reversing valve further disclosed in this application includes a valve body and end covers provided at both ends of the valve body. The valve body has a first plane portion and a second plane portion that are oppositely arranged and parallel. The valve body includes a first arc surface portion and a second arc surface portion that are oppositely arranged. The end cover includes a first cylinder body. An outer edge portion is provided at one end of the first cylinder body, and the outer edge portion is connected to the port portion of the valve body. A piston is provided in the piston chamber of the first cylinder body, and the cross-sectional shape of the first cylinder body is consistent with the cross-sectional shape of the valve body reduced in equal proportion.

[0008] The above technical solution can reduce the stress non-uniformity of the connection between the end cover and the valve body, effectively solving the problem of stress concentration. At the same time, under the same piston volume, the specification size of the valve body can be reduced, further reducing the product design cost.

[0009] The refrigeration system provided by this technical solution is equipped with the reversing valve. Since the reversing valve has the above technical effects, the refrigeration system equipped with this reversing valve should also have corresponding technical effects. Description of the Drawings

[0010] Figure 1 It is the front view of the reversing valve provided by the first embodiment of the present invention;

[0011] Figure 2 It is Figure 1 the side view of the reversing valve shown;

[0012] Figure 3 It is Figure 2 the A-A view of the reversing valve;

[0013] Figure 4 It is Figure 1 the axonometric view of the reversing valve shown;

[0014] Figure 5 It is Figure 1 the front view of the end cover shown in;

[0015] Figure 6 It is Figure 5 the left view of the end cover shown;

[0016] Figure 7 It is Figure 5 the axonometric view of the end cover shown;

[0017] Figure 8 It is Figure 3 the front view of the piston shown in;

[0018] Figure 9 It is Figure 8 the B-B view of the piston shown;

[0019] Figure 10 It is Figure 8 the axonometric view of the piston shown;

[0020] Figure 11 It is the static stress simulation diagram of a reversing valve in the related art;

[0021] Figure 12 It is Figure 11 the static stress analysis diagram of;

[0022] Figure 13 It is the static stress simulation diagram of the reversing valve provided by the first embodiment of the present invention;

[0023] Figure 14 is Figure 13 a static stress analysis diagram of

[0024] In the figure:

[0025] 10. Main valve 11. Valve body 111. First planar part 112. Second planar part 113. First arc-shaped part 114. Second arc-shaped part 12. End cover 121. First cylinder 1211. Outer edge part 1212. Piston cavity 1213. Third planar part 1214. Fourth planar part 1215. Third arc-shaped part 1216. Fourth arc-shaped part 122. Second cylinder 1221. Fifth planar part 1222. Sixth planar part 1223. Fifth arc-shaped part 1224. Sixth arc-shaped part 1225. Capillary hole 1226. Capillary 13. Piston 131. First piston pressing piece 132. Second piston pressing piece 133. Piston gasket 134. Piston ring 135. O-ring 14. Connecting rod 141. Connecting rod hem 20. Pilot valve. Specific embodiments

[0026] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0027] In this article, terms such as "upper, lower, inner, outer" are established based on the positional relationship shown in the drawings. Depending on the different drawings, the corresponding positional relationship may also change accordingly. Therefore, it cannot be understood as an absolute limitation of the protection scope; moreover, relational terms such as "first" and "second" are only used to distinguish one component with the same name from another, and do not necessarily require or imply any such actual relationship or order between these components.

[0028] Please refer to Figures 1 to 4 , Figure 1 is the front view of the reversing valve provided by the first embodiment of the present invention; Figure 2 is Figure 1 the side view of the reversing valve shown in Figure 3 is Figure 2 the A-A view of the reversing valve described above; Figure 4 is Figure 1 the axonometric view of the reversing valve shown in

[0029] As shown in the figure, in a specific embodiment, the reversing valve provided by the present invention mainly consists of a main valve 10 and a pilot valve 20. During operation, the reversing valve switches the high and low pressures through the pilot valve 20, thereby changing the pressure difference direction between the piston cavities at the left and right ends of the main valve 10 of the reversing valve, and pushing the piston to complete the left or right reversing action.

[0030] The main valve 10 is provided with a valve body 11 and end covers 12 arranged at both ends of the valve body. The cross-section of the valve body 11 is a quasi-square structure, having a first planar portion 111 and a second planar portion 112 that are oppositely arranged and parallel. The end cover 12 is an integral structure, having an integrally formed first cylinder 121 and a second cylinder 122. Among them, the radial dimension of the first cylinder 121 is larger, but smaller than the radial dimension of the valve body 11. The radial dimension of the second cylinder 122 is smaller than that of the first cylinder 121. One end of the first cylinder 121 opposite to the valve body 11 is provided with an outer edge portion 1211 formed by turning outwards generally along the radial direction. The outer edge portion 1211 is connected to the port portion of the valve body 11. An annular step portion is formed between the first cylinder 121 and the valve body 11. An annular step portion is also formed between the second cylinder 122 and the first cylinder 121. The inside of the first cylinder 121 is a piston chamber 1212, and a piston 13 is arranged in the piston chamber 1212. The second cylinder 122 is located at one end of the first cylinder 121 away from the outer edge portion 1211, and the end of the second cylinder 122 is closed. The cross-sectional shape of the first cylinder 121 is consistent with the cross-sectional shape of the valve body 11, and the cross-sectional area of the inner cavity of the first cylinder 121 is smaller than the cross-sectional area of the inner cavity of the valve body 11. The cross-sectional shape of the second cylinder 122 is consistent with the cross-sectional shape of the first cylinder 121, and the cross-sectional area of the inner cavity of the second cylinder 122 is smaller than the cross-sectional area of the inner cavity of the valve body 11.

[0031] Specifically, the first cylinder 121 has a third planar portion 1213 and a fourth planar portion 1214 that are oppositely arranged and parallel. The third planar portion 1213 is parallel to the first planar portion 111, and the fourth planar portion 1214 is parallel to the second planar portion 112. The projection of the third planar portion 1213 in the length direction of the valve body 11 is located between the first planar portion 111 and the second planar portion 112. The projection of the fourth planar portion 1213 in the length direction of the valve body 11 is located between the first planar portion 111 and the second planar portion 112.

[0032] Similarly, the valve body 11 has a first arc surface portion 113 and a second arc surface portion 114 that are oppositely arranged. The first cylinder 121 has a third arc surface portion 1215 and a fourth arc surface portion 1216 that are oppositely arranged. The projection of the third arc surface portion 1215 in the length direction of the valve body 11 is located between the first arc surface portion 113 and the second arc surface portion 114. The projection of the fourth arc surface portion 1216 in the length direction of the valve body 11 is located between the first arc surface portion 113 and the second arc surface portion 114.

[0033] That is to say, the distance between the third planar portion 1213 and the fourth planar portion 1214 is smaller than the distance between the first planar portion 111 and the second planar portion 112. The outer edge portion 1211 of the first cylinder 121 is also in a quasi-square structure, having a generally consistent circumferential width. There is no region with a sharp narrowing between the inner wall of the first cylinder 121 and the valve body 11.

[0034] Please also refer to Figures 5 to 7 , Figure 5 which is Figure 1 the front view of the end cap shown in Figure 6 which is Figure 5 the left view of the end cap shown in Figure 7 which is Figure 5 the axonometric view of the end cap shown in

[0035] As shown in the figure, similar to the first cylinder 121, the second cylinder 122 has a fifth planar portion 1221 and a sixth planar portion 1222 which are oppositely arranged and parallel. The fifth planar portion 1221 is parallel to the third planar portion 1213, the sixth planar portion 1222 is parallel to the fourth planar portion 1214. The projection of the fifth planar portion 1221 in the length direction of the valve body 11 is located between the third planar portion 1213 and the fourth planar portion 1214, and the projection of the sixth planar portion 1222 in the length direction of the valve body 11 is located between the third planar portion 1213 and the fourth planar portion 1214.

[0036] The second cylinder 122 has a fifth arc portion 1223 and a sixth arc portion 1224 which are oppositely arranged. The projection of the fifth arc portion 1223 in the length direction of the valve body 11 is located on the side between the third arc portion 1215 and the fourth arc portion 1216, and the projection of the sixth arc portion 1224 in the length direction of the valve body 11 is located between the third arc portion 1215 and the fourth arc portion 1216.

[0037] That is to say, the distance between the fifth planar portion 1221 and the sixth planar portion 1222 is smaller than the distance between the third planar portion 1213 and the fourth planar portion 1214. The annular step portion formed between the second cylinder 122 and the first cylinder 121 also has a uniform circumferential width, and there is no area with a sharp narrowing.

[0038] The first arc portion 113 and the second arc portion 114 are arranged in mirror symmetry, the third arc portion 1215 and the fourth arc portion 1214 are arranged in mirror symmetry, and the fifth arc portion 1223 and the sixth arc portion 1224 are arranged in mirror symmetry. Since the cross-sectional shapes of the first cylinder 121 and the second cylinder 122 of the end cap 12 are consistent with the cross-sectional shape of the valve body 11 and are also non-circular structures, the cross-sectional shapes of the end cap 12 and the valve body 11 can be evenly fitted, thereby reducing the unevenness of the stress at the connection between the end cap 12 and the valve body 11, and effectively solving the problem of stress concentration. At the same time, under the same piston volume, the specification size of the valve body 11 can be reduced, further reducing the product design cost.

[0039] In this embodiment, capillary holes 1225 can be specifically machined on the fifth planar portion 1221 or the sixth planar portion 1222 to connect the capillary 1226 through the capillary holes 1225. On the one hand, it is convenient to machine the capillary holes 1225 on the planar portion. On the other hand, since the fifth planar portion 1221 or the sixth planar portion 1222 is parallel to the first planar portion 111 and the second planar portion 112 of the valve body 11, it is convenient to connect the capillary 1226 to the pilot valve 20 after bending.

[0040] Please refer to Figure 8 、 Figure 9 、 Figure 10 , Figure 8 is Figure 3 the front view of the piston shown in Figure 9 is Figure 8 the B-B view of the piston shown in Figure 10 is Figure 8 the isometric view of the piston shown in

[0041] As shown in the figure, since the first cylinder 121 is designed into a non-circular structure, the shape of its piston chamber 1212 also changes accordingly. Therefore, on the premise that the cross-sectional area S of the piston chamber 1212 meets the requirements of the commutation ability, the piston 13 is also designed into a non-circular structure. In this embodiment, the cross-sectional shape of the piston 13 is consistent with the cross-sectional shape of the piston chamber 1212 of the first cylinder 121.

[0042] Specifically, the piston 13 mainly consists of a first piston pressing piece 131, a second piston pressing piece 132, a piston gasket 133 and a piston ring 134; the piston gasket 133 is sandwiched between the first piston pressing piece 131 and the second piston pressing piece 132, and is laser welded to the piston gasket 133 through the round holes in the central areas of the first piston pressing piece 131 and the second piston pressing piece 132. The radial dimension of the piston gasket 133 is smaller than the radial dimensions of the first piston pressing piece 131 and the second piston pressing piece 132. The three together form a circumferential groove, and an O-ring 135 is provided in the groove. The piston ring 134 is arranged on the outer peripheral part of the O-ring 135, and at least a part of the inner edge of the piston ring 134 is located in the groove to prevent the piston ring 134 from disengaging from the groove. The piston ring 134 can slide and seal with the inner wall of the first cylinder 121. Therefore, the piston ring 134 is made of a lubricating material with certain wear resistance, such as made of PEEK material.

[0043] In actual production, the O-ring 135 and the piston ring 134 are installed into the groove formed between the piston gasket 133, the first piston pressing piece 131 and the second piston pressing piece 132, thus completing the assembly of the piston component. After the piston component and the connecting rod 14 are abutted against the end face of the first piston pressing piece 131 or the second piston pressing piece 132 through the connecting rod hemming 141, they are positioned by a centering tooling and the assembly connection is completed by laser welding.

[0044] Since the piston component is assembled and welded by three metal plates and the main body is connected by laser welding, the number of parts can be reduced, the assembly process can be simplified, and the design cost can be reduced. Compared with the conventional piston components with screws and rivets, there is no need to worry about the interference problem between the rivets and the end cover.

[0045] It should be noted here that the statement "the cross-sectional shapes of the first cylinder 121 and the second cylinder 122 are consistent with the proportionally reduced cross-sectional shape of the valve body 11" in this article does not limit the two shapes to be completely the same, but means that the cross-sectional shapes of the two are basically the same, and both have the same significant design features. For example, both have opposite planes and opposite arc surfaces. As for the fillets between the plane and the arc surface, there may be slight differences. The fillet of the valve body 11 can be designed to be relatively small, and the fillets of the first cylinder 121 and the second cylinder 122 can be designed to be relatively large. That is to say, on the premise of having the same significant design features, a certain deviation in the shapes of the two is allowed within an appropriate range.

[0046] The valve body in the related technology is a cross-section quasi-square structure, while the end cover piston cavity is a circular structure. To ensure sufficient overlap at the circular and square combination positions, the square needs to be larger than the circular diameter, so the design of the valve body will be larger. At the same time, the minimum overlap position at the combination position of the circular end cover and the square valve body will form stress concentration under the action of gas pressure inside, as Figure 11 、 Figure 12 shown in the stress static analysis, the maximum stress position is greater than 200 MPa. From the results of the actual trial-produced samples, this position fails in the pressure fatigue durability test and cannot meet the design requirements.

[0047] By adopting the non-circular structure piston cavity design of the present utility model, the cross-sectional shapes of the end cover 12 and the valve body 11 of the reversing valve are evenly matched, thereby reducing the stress non-uniformity at the connection between the end cover 12 and the valve body 11 and reducing local stress concentration. As Figure 13 、 Figure 14 shown in the stress static comparison analysis results, the local maximum stress in the combination area of the end cover 12 and the valve body 11 can be reduced by about half, from greater than 200 MPa to about 100 MPa. At the same time, the specification size of the valve body 11 can be reduced under the same piston area.

[0048] Therefore, the adoption of the technology of the present utility model can effectively solve the stress concentration problem in the prior art and further reduce the product design cost.

[0049] The above embodiments are only one solution of the present utility model, and are not specifically limited thereto. On this basis, targeted adjustments can be made according to actual needs to obtain different implementation manners. Since there are many possible implementation manners, they will not be listed one by one here.

[0050] In addition to the above-mentioned reversing valve, the present utility model also provides a refrigeration system, such as an air conditioner, a heat pump and other systems. The system is provided with a reversing valve for controlling the flow path switching, and the reversing valve is the reversing valve described above. For the remaining structures of the refrigeration system, please refer to the prior art and will not be elaborated herein.

[0051] The above has introduced in detail the reversing valve and the refrigeration system provided by the present utility model. Specific examples are used in this article to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the core idea of the present utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and modifications can be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. A reversing valve, comprising a valve body (11) and end covers (12) arranged at both ends of the valve body (11), wherein each of the end covers (12) is fixedly connected to the valve body (11), the valve body (11) comprises a first plane portion (111) and a second plane portion (112) which are arranged oppositely and in parallel, the valve body (11) comprises a first curved surface portion (113) and a second curved surface portion (114) which are arranged oppositely, the end cover (12) comprises a first cylinder (121), the first cylinder (121) comprises a piston cavity (1212), a piston (13) is arranged in the piston cavity (1212), and the valve body (11) comprises a first cylinder (121), the first cylinder (121) comprises a piston cavity (1212), a piston (13) is arranged in the piston cavity (1212), and the valve body (11) comprises a first cylinder (121), the first cylinder (121) comprises a piston cavity (1212), and a piston (13) is arranged in the piston cavity (1212), wherein: The cross-sectional shape of the first cylinder (121) is consistent with the cross-sectional shape of the valve body (11), and the cross-sectional area of ​​the inner cavity of the first cylinder (121) is smaller than the cross-sectional area of ​​the inner cavity of the valve body (11).

2. The reversing valve according to claim 1, characterized in that: The first cylinder (121) has a third plane portion (1213) and a fourth plane portion (1214) which are arranged opposite to each other and are parallel to each other, wherein the third plane portion (1213) is parallel to the first plane portion (111), and the fourth plane portion (1214) is parallel to the second plane portion (112). The projection of the third plane portion (1213) in the length direction of the valve body (11) is located between the first plane portion (111) and the second plane portion (112), and the projection of the fourth plane portion (1214) in the length direction of the valve body (11) is located between the first plane portion (111) and the second plane portion (112).

3. The reversing valve according to claim 2, characterized in that: The end cover (12) further comprises a second cylinder (122), the first cylinder (121) being located between the second cylinder (122) and the valve body (11), the end of the second cylinder (122) away from the first cylinder (121) being closed, the cross-sectional shape of the second cylinder (122) being consistent with the cross-sectional shape of the first cylinder (121), and the cross-sectional area of ​​the inner cavity of the second cylinder (122) being smaller than the cross-sectional area of ​​the inner cavity of the valve body (11).

4. The reversing valve according to claim 3, characterized in that: The first cylinder (121) has a third arc surface portion (1215) and a fourth arc surface portion (1216) which are arranged opposite to each other. The projection of the third arc surface portion (1215) in the length direction of the valve body (11) is located between the first arc surface portion (113) and the second arc surface portion (114). The projection of the fourth arc surface portion (1216) in the length direction of the valve body (11) is located between the first arc surface portion (113) and the second arc surface portion (114).

5. The reversing valve according to claim 4, characterized in that: The second cylinder (122) has a fifth plane portion (1221) and a sixth plane portion (1222) which are arranged opposite to each other and are parallel to each other, wherein the fifth plane portion (1221) is parallel to the third plane portion (1213), and the sixth plane portion (1222) is parallel to the fourth plane portion (1214). The projection of the fifth plane portion (1221) in the length direction of the valve body (11) is located between the third plane portion (1213) and the fourth plane portion (1214), and the projection of the sixth plane portion (1222) in the length direction of the valve body (11) is located between the third plane portion (1213) and the fourth plane portion (1214). Located between the third plane portion (1213) and the fourth plane portion (1214), the second cylinder (122) has a fifth arc surface portion (1223) and a sixth arc surface portion (1224) arranged opposite to each other, the projection of the fifth arc surface portion (1223) in the length direction of the valve body (11) is located between the third arc surface portion (1215) and the fourth arc surface portion (1216), and the projection of the sixth arc surface portion (1224) in the length direction of the valve body (11) is located between the third arc surface portion (1215) and the fourth arc surface portion (1216).

6. The reversing valve according to claim 5, characterized in that: The fifth plane portion (1221) or the sixth plane portion (1222) of the second cylinder (122) is provided with a capillary hole (1225) for connecting a capillary tube (1226).

7. The reversing valve according to any one of claims 1 to 6, characterized in that: The cross-sectional shape of the piston (13) is consistent with the cross-sectional shape of the piston chamber (1212) of the first cylinder (121).

8. The reversing valve according to any one of claims 1 to 6, characterized in that: The piston (13) is dynamically sealed with the inner wall of the first cylinder (121), and the piston (13) comprises a first piston pressing plate (131), a second piston pressing plate (132), a piston gasket (133) and a piston ring (134); the piston gasket (133) is located between the first piston pressing plate (131) and the second piston pressing plate (132) to form a circumferential groove, a sealing ring is provided in the groove, the piston ring (134) is provided on the outer periphery of the sealing ring, and at least a portion of the piston ring (134) is located in the groove.

9. A reversing valve, comprising a valve body (11) and end covers (12) arranged at both ends of the valve body (11), the valve body (11) having a first plane portion (111) and a second plane portion (112) arranged oppositely and in parallel, the valve body (11) comprising a first arcuate portion (113) and a second arcuate portion (114) arranged oppositely, the end cover (12) comprising a first cylinder (121), one end of the first cylinder (121) being provided with an outer edge portion (1211), the outer edge portion (1211) being connected to a port portion of the valve body (11), a piston (13) being arranged in a piston chamber (1212) of the first cylinder (121), characterized in that: The cross-sectional shape of the first cylinder (121) is consistent with the cross-sectional shape of the valve body (11) reduced in proportion.

10. The reversing valve according to claim 9, characterized in that: The end cover (12) further comprises a second cylinder (122), the second cylinder (122) being located at an end of the first cylinder (121) away from the outer edge portion (1211), the end of the second cylinder (122) being closed, and the cross-sectional shape of the second cylinder (122) being consistent with the cross-sectional shape of the first cylinder (121) reduced in proportion.

11. A refrigeration system, comprising a reversing valve for controlling flow path switching, characterized in that: The reversing valve is the reversing valve according to any one of claims 1 to 10.

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