Electronic expansion valve and air conditioning system

Abstract

The utility model relates to the technical field of expansion valves, in particular to an electronic expansion valve and an air conditioning system. The electronic expansion valve comprises a valve body assembly and a valve element assembly, the valve body assembly is provided with a valve cavity and a valve port, and the valve element assembly is movably arranged in the valve cavity so as to open or close the valve port. The valve element assembly comprises a valve needle and a connecting piece, one end of the valve needle is partially inserted into the connecting piece and welded to the connecting piece, and the other end of the valve needle is movably matched with the valve port. An annular groove is formed in the periphery of the valve needle, and the annular groove is formed in the side, close to the valve port, of the welding position of the valve needle and the connecting piece. According to the electronic expansion valve and the air conditioning system, the problem that when a valve needle and a connecting piece of an existing electronic expansion valve are welded, the valve needle is prone to deformation due to heat influence is solved.

Description

Technical Field

[0001] The present application relates to the technical field of expansion valves, and particularly to an electronic expansion valve and an air-conditioning system. Background Art

[0002] An electronic expansion valve is an important component in an air-conditioning system, mainly including a valve body and a valve needle movably installed in the valve body, to open or close a valve port through the valve needle, so as to play a role in throttling and pressure reduction and regulating the flow rate.

[0003] In the related art, the electronic expansion valve further includes a connecting member and a guiding assembly, etc. The guiding assembly is installed in the valve body. After the valve needle is fixedly welded to the connecting member, it is installed in the guiding assembly and movably cooperates with the guiding assembly. Among them, the connecting member and the guiding assembly are in clearance fit, and one end of the valve needle away from the connecting member penetrates through the guiding assembly and cooperates with the guiding assembly. However, the heat influence generated by the welding between the connecting member and the valve needle easily causes the valve needle to deform, thereby reducing the concentricity between the connecting member and the valve needle, resulting in poor sealing when the valve needle closes the valve port. Summary of the Utility Model

[0004] Based on this, it is necessary to provide an electronic expansion valve and an air-conditioning system to solve the problem that the heat influence during the welding of the valve needle and the connecting member of the existing electronic expansion valve easily causes the valve needle to deform.

[0005] The present application provides an electronic expansion valve, which includes a valve body assembly and a valve core assembly. The valve body assembly is provided with a valve cavity and a valve port. The valve core assembly is movably arranged in the valve cavity to open or close the valve port. The valve core assembly includes a valve needle and a connecting member. One end of the valve needle is partially inserted into the connecting member and welded to the connecting member. The other end of the valve needle movably cooperates with the valve port. Wherein, an annular groove is formed on the outer periphery of the valve needle, and the annular groove is formed on one side of the welding joint between the valve needle and the connecting member close to the valve port.

[0006] In one embodiment, the valve needle includes a main body portion and an annular boss. The annular boss protrudes radially and is connected to the outer periphery of the main body portion, and the annular boss abuts and cooperates with the connecting member along the axial direction and is welded to the connecting member.

[0007] In one embodiment, the annular groove is arranged at the connection between the main body portion and the annular boss, and along the axial direction of the valve needle, the annular groove is arranged on one side of the annular boss away from the valve port.

[0008] In one embodiment, a chamfer groove is provided on the inner wall of the connecting member near one end of the valve needle. The chamfer groove is correspondingly arranged with the annular groove and communicated with the annular groove.

[0009] In one embodiment, the valve needle includes a main body portion and an annular boss, the annular boss being connected to the outer periphery of the main body portion. Wherein, the annular boss is inserted into the connecting member and welded to the connecting member.

[0010] In one embodiment, the annular groove is provided at the connection between the main body portion and the annular boss, and along the axial direction of the valve needle, the annular groove is provided on the side of the annular boss close to the valve port.

[0011] In one embodiment, the cross-section of the inner side wall of the annular groove is arc-shaped.

[0012] In one embodiment, a guiding surface is provided at one end of the valve needle close to the connecting member.

[0013] In one embodiment, the valve body assembly includes a main valve body and a guiding unit, the guiding unit being installed in the main valve body and connected to the main valve body; wherein, the guiding unit is provided with a guiding hole, and one end of the valve needle away from the annular groove penetrates through the guiding hole and is in movable guiding cooperation with the inner wall of the guiding hole.

[0014] The present application also provides an air-conditioning system, which includes the electronic expansion valve according to any one of the above embodiments.

[0015] Compared with the prior art, for the electronic expansion valve and the air-conditioning system provided by the present application, when the valve needle is welded to the connecting member, since an annular groove is provided between the welding position of the valve needle and the position close to the valve port, therefore, the annular groove can be used to slow down the transfer of heat generated during welding along the valve needle towards the valve port direction, thereby reducing the deformation of the valve needle caused by thermal influence, improving the matching performance between the valve needle and the valve port and other components in the valve body, and greatly reducing the risk of poor sealing when the valve needle closes the valve port. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a cross-sectional view of the electronic expansion valve according to an embodiment provided by the present application;

[0018] Figure 2 It is a partial cross-sectional view of the valve core assembly of Embodiment 1 provided by the present application;

[0019] Figure 3This is a partial cross-sectional view of the valve core assembly of the second embodiment provided by this application.

[0020] The meanings of the symbols in the figure are as follows:

[0021] 100, electronic expansion valve; 10, valve body assembly; 101, valve cavity; 102, valve port; 103, guiding hole; 11, main valve body; 12, guiding unit; 121, guiding sleeve; 122, guiding column; 123, seal; 20, valve core assembly; 21, valve needle; 2101, annular groove; 2102, guiding surface; 211, main body part; 212, annular boss; 22, connecting piece; 2201, chamfer groove; 30, sleeve; 40, driving assembly. Detailed implementation manners

[0022] To make the above objects, features, and advantages of this application more obvious and understandable, the following will describe the detailed implementation manners of this application with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of this application. Therefore, this application is not limited by the specific embodiments disclosed below.

[0023] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the description of this application are only for the purpose of illustration and do not represent the only implementation manner.

[0024] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of this application, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0025] In this application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first feature is in direct contact with the second feature, or the first feature is in indirect contact with the second feature through an intermediate medium. Moreover, the first feature being "above", "over" or "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or it only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" or "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or it only indicates that the horizontal height of the first feature is lower than that of the second feature.

[0026] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the related listed items.

[0027] An electronic expansion valve is an important component in an air-conditioning system, mainly including a valve body and a valve needle movably installed in the valve body to open or close a valve port through the valve needle, so as to play a role in throttling, pressure reduction and flow regulation.

[0028] In the related art, the electronic expansion valve also includes a connecting piece and a guiding assembly, etc. The guiding assembly is installed in the valve body. After the valve needle is welded and fixed to the connecting piece, it is installed in the guiding assembly and is movably matched with the guiding assembly. Among them, the connecting piece and the guiding assembly are in clearance fit, and one end of the valve needle away from the connecting piece passes through the guiding assembly and is matched with the guiding assembly. However, the heat influence generated by the welding between the connecting piece and the valve needle easily causes the valve needle to deform, thereby reducing the concentricity between the connecting piece and the valve needle, resulting in poor sealing when the valve needle closes the valve port.

[0029] Please refer to Figures 1-3 , to solve the problem that the heat influence during the welding of the valve needle and the connecting piece of the existing electronic expansion valve easily causes the valve needle to deform, this application provides an electronic expansion valve 100, which includes a valve body assembly 10 and a valve core assembly 20. The valve body assembly 10 is provided with a valve cavity 101 and a valve port 102. The valve core assembly 20 is movably arranged in the valve cavity 101 to open or close the valve port 102. The valve core assembly 20 includes a valve needle 21 and a connecting piece 22. One end of the valve needle 21 is partially inserted into the connecting piece 22 and welded to the connecting piece 22, and the other end of the valve needle 21 is movably matched with the valve port 102. Among them, an annular groove 2101 is formed on the outer periphery of the valve needle 21, and the annular groove 2101 is formed on the side of the welding joint between the valve needle 21 and the connecting piece 22 close to the valve port 102.

[0030] It can be understood that when the valve needle 21 and the connecting member 22 are welded, since the valve needle 21 is provided with an annular groove 2101 between the welding position and the position near the valve port 102, the annular groove 2101 can be used to slow down the transfer of heat generated during welding along the valve needle 21 towards the valve port 102, thereby reducing the deformation of the valve needle 21 caused by the heat influence, improving the matching performance between the valve needle 21 and the valve port 102 and other components in the valve body, and greatly reducing the risk of poor sealing when the valve needle closes the valve port.

[0031] In a specific embodiment of the present application, the connecting member 22 has a sleeve structure with a hollow interior. Among them, the connecting member 22 and the valve needle 21 can be moved through the cooperation of a screw and a nut. Specifically, the screw is connected to one end of the connecting member 22 away from the valve needle 21, and the nut is fixed relative to the valve body assembly 10. Through the threaded cooperation of the screw and the nut, the screw is driven to move axially, thereby driving the connecting member 22 and the valve needle 21 to move synchronously.

[0032] In other embodiments, the valve needle 21 can also be connected to the nut through the connecting member 22. At this time, the screw is set to be able to rotate circumferentially relative to the valve body assembly 10, but remain stationary axially. Through the threaded cooperation of the screw and the nut, the nut is driven to move axially, thereby driving the connecting member 22 and the valve needle 21 to move synchronously.

[0033] Furthermore, in one embodiment, the cross-section of the inner side wall of the annular groove 2101 is arc-shaped. In this way, it is beneficial to reduce the stress concentration at the annular groove 2101, thereby ensuring the structural strength of the valve needle 21.

[0034] In one embodiment, as Figure 2 and Figure 3 shown, one end of the valve needle 21 close to the connecting member 22 is provided with a guiding surface 2102. In this way, it is convenient for the valve needle 21 to be inserted into the connecting member 22, and the connection difficulty between the valve needle 21 and the connecting member 22 can be reduced.

[0035] Specifically, the guiding surface 2102 can be set as a conical surface or an arc-shaped surface.

[0036] In one embodiment, as Figure 1 shown, the valve body assembly 10 includes a main valve body 11 and a guiding unit 12. The guiding unit 12 is installed in the main valve body 11 and connected to the main valve body 11. The valve core assembly 20 is movably installed in the guiding unit 12 to realize the radial limit of the valve core unit through the guiding unit 12.

[0037] Furthermore, the guiding unit 12 is provided with a guiding hole 103. One end of the valve needle 21 away from the annular groove 2101 penetrates through the guiding hole 103 and is in movable guiding cooperation with the inner wall of the guiding hole 103. In this way, the coaxiality of the valve needle 21 and the guiding unit 12 can be improved, the probability of interference between the valve needle 21 and the guiding unit 12 can be reduced, and the movement of the valve needle 21 can be made smoother.

[0038] Specifically, the guiding unit 12 includes a guiding sleeve 121, a guiding column 122 and a seal 123. The guiding sleeve 121 is sleeved on the outer periphery of the guiding column 122 and connected to the guiding column 122. Moreover, a space for installing the seal 123 is formed between the guiding sleeve 121 and the guiding column 122. Among them, the guiding hole 103 penetrates through the guiding sleeve 121 and the guiding column 122. In this way, not only is it convenient to install the seal 123, but also the seal 123 can be sleeved on the periphery of the valve needle 21 to improve the overall sealing performance. Moreover, multiple guiding can be formed between the valve needle 21 and the guiding column 122 and the guiding sleeve 121, thereby further improving the reliability of the cooperation between the valve needle 21 and the valve port 102.

[0039] It can be understood that in this application, by providing the annular groove 2101, the deformation of the valve needle 21 is avoided, thereby effectively improving the coaxiality between the valve needle 21 and the guiding sleeve 121, the guiding column 122 and the seal 123. The guiding and sealing cooperation between them is also more reliable, greatly improving the reliability of the cooperation between the valve needle 21 and the valve port 102.

[0040] In an embodiment, the electronic expansion valve 100 further includes a sleeve 30 and a driving assembly 40. The sleeve 30 is connected to one end of the main valve body 11 to form a sealed valve cavity 101 with the main valve body 11. The driving assembly 40 is installed in the sleeve 30, and the output end of the driving assembly 40 is connected to the valve core assembly 20 for driving the valve core assembly 20 to move axially, so as to adjust the opening degree of the valve port 102.

[0041] Embodiment 1

[0042] In this embodiment, as Figure 2 shown, the valve needle 21 includes a main body portion 211 and an annular boss 212. The annular boss 212 protrudes radially and is connected to the outer periphery of the main body portion 211. Moreover, the annular boss 212 abuts against the connecting member 22 axially and is welded to the connecting member 22. Through the abutment between the annular boss 212 and the connecting member 22, the limit between the connecting member 22 and the valve needle 21 can be realized, facilitating subsequent welding.

[0043] Specifically, the outer side wall of the annular boss 212 and the outer side wall of the connecting member 22 are flush. At this time, the welding position of the valve needle 21 and the connecting member 22 is at the abutting position of the outer side wall of the annular boss 212 and the outer side wall of the connecting member 22.

[0044] Further, in an embodiment, an annular groove 2101 is provided at the connection between the main body portion 211 and the annular boss 212, and along the axial direction of the valve needle 21, the annular groove 2101 is provided on the side of the annular boss 212 away from the valve port 102.

[0045] That is, the annular groove 2101 is arranged close to the welding joint of the valve needle 21 and the connecting member 22, so as to further reduce the probability of deformation of the portion of the valve needle 21 close to the valve port 102 and meet the coaxiality requirements of the valve needle 21. Here, the portion of the valve needle 21 close to the valve port 102 is the portion where the valve needle 21 cooperates with the guiding unit 12 and the valve port 102, etc.

[0046] In an embodiment, as Figure 2 shown, a chamfer groove 2201 is provided on the inner wall of the connecting member 22 near one end of the valve needle 21. The chamfer groove 2201 is correspondingly arranged with the annular groove 2101 and is communicated with the annular groove 2101.

[0047] Since certain burrs may be generated during the machining of the annular boss 212, at this time, the cooperation of the chamfer groove 2201 and the annular groove 2101 can accommodate these burrs, so that the connecting member 22 and the valve needle 21 can be assembled in place. At the same time, it can also reduce the poor coaxiality caused by the interference of the bottom corners between the connecting member 22 and the valve needle 21.

[0048] Embodiment Two

[0049] In this embodiment, as Figure 3 shown, the valve needle 21 includes a main body portion 211 and an annular boss 212. The annular boss 212 is connected to the outer periphery of the main body portion 211. Among them, the annular boss 212 is inserted into the connecting member 22 and welded to the connecting member 22. In this way, it is also convenient for the positioning between the valve needle 21 and the connecting member 22, which is beneficial to subsequent welding. At this time, the welding joint of the valve needle 21 and the connecting member 22 is located at the abutting portion between the end face of the annular boss 212 close to one end of the valve port 102 and the end face of the connecting member 22 close to one end of the valve port 102. Among them, the end face of the annular boss 212 close to one end of the valve port 102 is preferably flush with the end face of the connecting member 22.

[0050] Further, in an embodiment, an annular groove 2101 is provided at the connection between the main body portion 211 and the annular boss 212, and along the axial direction of the valve needle 21, the annular groove 2101 is provided on the side of the annular boss 212 close to the valve port 102.

[0051] That is, the annular groove 2101 is arranged near the welding joint of the valve needle 21 and the connecting piece 22, thereby further reducing the probability that the part of the valve needle 21 near the valve port 102 is deformed, and meeting the coaxiality requirement of the valve needle 21. Here, the part of the valve needle 21 near the valve port 102 is the part where the valve needle 21 cooperates with the guiding unit 12 and the valve port 102, etc.

[0052] Specifically, when the valve needle 21 and the connecting piece 22 of this embodiment are welded, the weld shrinkage between the two mainly bears axial force, and under the action of the annular groove 2101, the thermal influence on the radial direction can be reduced. That is, the deformation of the valve needle 21 in the radial direction is smaller, so that the coaxiality of the valve needle 21 can be ensured.

[0053] This application also provides an air-conditioning system, which includes the electronic expansion valve 100 of any one of the above embodiments.

[0054] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0055] The above-described embodiments only represent several implementation manners of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of this application, several deformations and improvements can still be made, and these all belong to the protection scope of this application. Therefore, the patent protection scope of this application should be subject to the appended claims.

Claims

1. An electronic expansion valve, comprising a valve body assembly (10) and a valve core assembly (20). The valve body assembly (10) is provided with a valve cavity (101) and a valve port (102). The valve core assembly (20) is movably arranged in the valve cavity (101) to open or close the valve port (102); It is characterized in that The valve core assembly (20) includes a valve needle (21) and a connecting member (22). One end portion of the valve needle (21) is inserted into the connecting member (22) and welded to the connecting member (22). The other end of the valve needle (21) is movably engaged with the valve port (102); Wherein, an annular groove (2101) is formed on the outer periphery of the valve needle (21). The annular groove (2101) is formed on one side of the welding joint of the valve needle (21) and the connecting member (22) close to the valve port (102).

2. The electronic expansion valve according to claim 1, wherein The valve needle (21) includes a main body portion (211) and an annular boss (212). The annular boss (212) protrudes radially and is connected to the outer periphery of the main body portion (211). The annular boss (212) is in abutting engagement with the connecting member (22) along the axial direction and welded to the connecting member (22).

3. The electronic expansion valve according to claim 2, wherein, The annular groove (2101) is arranged at the joint of the main body portion (211) and the annular boss (212). Along the axial direction of the valve needle (21), the annular groove (2101) is arranged on the side of the annular boss (212) away from the valve port (102).

4. The electronic expansion valve according to claim 3, wherein The inner wall of the connecting member (22) near one end of the valve needle (21) is provided with a chamfer groove (2201). The chamfer groove (2201) is correspondingly arranged with the annular groove (2101) and communicated with the annular groove (2101).

5. The electronic expansion valve according to claim 1, characterized in that, The valve needle (21) includes a main body portion (211) and an annular boss (212). The annular boss (212) is connected to the outer periphery of the main body portion (211). Wherein, the annular boss (212) is inserted into the connecting member (22) and welded to the connecting member (22).

6. The electronic expansion valve according to claim 5, characterized in that, The annular groove (2101) is arranged at the joint of the main body portion (211) and the annular boss (212). Along the axial direction of the valve needle (21), the annular groove (2101) is arranged on the side of the annular boss (212) close to the valve port (102).

7. The electronic expansion valve according to claim 1, wherein The cross section of the inner side wall of the annular groove (2101) is arc-shaped.

8. The electronic expansion valve according to claim 1, wherein One end of the valve needle (21) close to the connecting member (22) is provided with a guiding surface (2102).

9. The electronic expansion valve according to claim 1, wherein The valve body assembly (10) includes a main valve body (11) and a guiding unit (12). The guiding unit (12) is installed in the main valve body (11) and connected to the main valve body (11); Wherein, the guiding unit (12) is provided with a guiding hole (103). One end of the valve needle (21) away from the annular groove (2101) passes through the guiding hole (103) and is movably guided and engaged with the inner wall of the guiding hole (103).

10. An air conditioning system, characterized in that, An electronic expansion valve as claimed in any one of claims 1-9 is included.

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