Spindle assembly and electronic expansion valve having the same

Abstract

a valve sleeve (10) having a cavity and a first end and a second end opposite to each other; a bushing (20) movably disposed within the cavity and restrictively engaged with the first end of the valve sleeve (10) for driving and moving the valve sleeve (10); a spring (30) disposed within the cavity and having one end connected to the bushing (20) and the other end connected to the second end of the valve sleeve (10); and a seal member (40) fixedly disposed at the second end of the valve sleeve (10) for sealing a valve port (83). A spindle assembly is also provided, as well as an electronic expansion valve having the same.

Description

[Technical field]

[0001] This application claims priority to a patent application filed with the China National Intellectual Property Office on December 11, 2020, bearing application number 202011446606.X and titled "Spindle assembly and electronic expansion valve having the same."

[0002] The present application relates to the technical field of expansion valves, and more particularly to a spindle assembly and an electronic expansion valve having the same. [Background technology]

[0003] At present, in conventional electronic expansion valves, the valve port is sealed by driving a spindle to move up and down inside the valve body. Since both the spindle and the valve port are made of metal materials, the spindle and the valve port are hard-sealed, which has poor sealing ability and is prone to leakage. Summary of the Invention

[0004] The present application provides a spindle assembly and an electronic expansion valve having the same to solve the problem of relatively poor sealing in the prior art.

[0005] According to one aspect of the present application, there is provided a spindle assembly including a valve sleeve having a cavity and opposite first and second ends, a bushing movably disposed within the cavity and restrictively engaged with the first end of the valve sleeve for driving and moving the valve sleeve, a spring disposed within the cavity and having one end connected to the bushing and the other end connected to the second end of the valve sleeve, and a seal member fixedly disposed at the second end of the valve sleeve for sealing a valve port.

[0006] Additionally, the spindle assembly further includes a fastening member disposed between the valve sleeve and the seal member for fastening the seal member to the valve sleeve.

[0007] The fixed member further includes a guide sleeve having a first end located within the cavity and a second end passing through the second end of the valve sleeve and the seal member in sequence, and a gasket connected to the second end of the guide sleeve.

[0008] Additionally, a limiting structure is provided on the first end of the guide sleeve, the limiting structure limitingly engaging the second end of the valve sleeve to limit displacement of the guide sleeve relative to the valve sleeve.

[0009] Furthermore, the seal member has a groove at one end thereof remote from the valve sleeve, and the gasket is positioned within the groove.

[0010] Additionally, the spindle assembly further includes a positioning structure disposed between the second end of the valve sleeve and the seal member.

[0011] Furthermore, a first step structure is provided on an end face of the sealing member toward one end of the valve sleeve, and a second step structure is provided on an end face of a second end of the valve sleeve, and the first step structure and the second step structure are engaged with each other to form a positioning structure.

[0012] Additionally, the outer diameter of the seal member is the same as the outer diameter of the second end of the valve sleeve.

[0013] Additionally, the spindle assembly further includes a seal cover fixedly mounted to the first end of the valve sleeve for limiting displacement of the bushing in the valve sleeve.

[0014] According to another aspect of the present application, there is provided an electronic expansion valve including a valve body having a valve port, a screw provided within the valve body, and the above-mentioned spindle assembly, the spindle assembly being movably provided within the valve body and provided corresponding to the valve port, the screw being drivingly connected to a bush of the spindle assembly, and the screw moving the valve sleeve in conjunction with the bush.

[0015] When the technical aspects of the present application are applied, the spindle assembly includes a valve sleeve, a bush, a spring and a sealing member, wherein the bush drives and moves the valve sleeve, and the sealing member is fixed to the second end of the valve sleeve to seal the valve orifice. Because the material of the sealing member is relatively soft, when the valve sleeve moves downward, the sealing member can be deformed by being pressed by both the valve sleeve and the valve orifice, and can closely adhere to the valve orifice, thereby improving the overall sealing performance. [Brief description of the drawings]

[0016] The drawings in the specification which form a part of this application are intended to provide a further understanding of the application, and the schematic examples and their explanations are intended to interpret the application and are not intended to unduly limit the application.

[0017] [Figure 1] FIG. 2 shows a structural schematic diagram of a spindle assembly provided in the present application. [Diagram 2] 2 shows a schematic diagram of the mounting structure of the seal member and the valve sleeve in FIG. 1. FIG. [Diagram 3] 1 shows a cross-sectional view of an electronic expansion valve provided in the present application. [Figure 4] FIG. 1 shows a side view of an electronic expansion valve provided in the present application.

[0018] Here, the above drawings include the following reference numbers: 10 valve sleeve, 20 bush, 30 spring, 40 seal member, 41 groove, 51 guide sleeve, 52 gasket, 61 first step structure, 62 second step structure, 70 seal cover, 81 valve body, 82 screw, 83 valve port. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, the technical aspects of the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, but it is clear that the described embodiments are only a part of the embodiments of the present application, and are not all of the embodiments. The following description of at least one exemplary embodiment is for illustrative purposes only, and does not constitute any limitation on the present application and its application or use. All other embodiments that a person skilled in the art can obtain based on the embodiments in the present application without creative effort belong to the scope of protection of the present application.

[0020] As shown in FIG. 1 and FIG. 2, the spindle assembly provided in the embodiment of the present application includes a valve sleeve 10, a bush 20, a spring 30, and a seal member 40. Here, the valve sleeve 10 has a cavity and a first end and a second end provided opposite to each other. The bush 20 is movably provided in the cavity and is limitedly engaged with the first end of the valve sleeve 10, and can drive and move the valve sleeve 10, specifically, the valve sleeve 10 can be moved up and down in the valve body in cooperation with the bush 20. The spring 30 is provided in the cavity, one end is connected to the bush 20, and the other end is connected to the second end of the valve sleeve 10, and the spring 30 realizes the elastic connection between the bush 20 and the valve sleeve 10 and plays a role of relaxation. The seal member 40 is fixedly provided at the second end of the valve sleeve 10, and the seal member 40 seals the valve port 83. Specifically, the sealing member 40 may be made of polytetrafluoroethylene material, and of course, the sealing member 40 may be made of other plastic or rubber materials as long as they meet the requirements for wear resistance and corrosion resistance.

[0021] According to the device provided in the present application, the spindle assembly includes a valve sleeve 10, a bush 20, a spring 30 and a sealing member 40, in which the bush 20 drives the valve sleeve 10 to move, and the sealing member 40 is fixed to the second end of the valve sleeve 10 to seal the valve orifice 83. Because the material of the sealing member 40 is relatively soft, when the valve sleeve 10 moves downward, the sealing member 40 can be deformed by the pressure of both the valve sleeve 10 and the valve orifice 83, and can closely adhere to the valve orifice 83, thereby improving the overall sealing performance.

[0022] Specifically, the spindle assembly further includes a fixing member disposed between the valve sleeve 10 and the seal member 40 for fixing the seal member 40 to the valve sleeve 10. The fixing member may be a fastening member or other connecting structure. Using the fixing member to fix the seal member 40 allows the seal member 40 to be fixed to the valve sleeve 10 and also facilitates connection and installation.

[0023] As shown in FIG. 2, in this embodiment, the fixing member includes a guide sleeve 51 and a gasket 52. The guide sleeve 51 has a first end located in the cavity, and a second end passing through the second end of the valve sleeve 10 and the sealing member 40 in sequence, and the gasket 52 is connected to the second end of the guide sleeve 51. The gasket 52 and the guide sleeve 51 are engaged with each other to fix the sealing member 40 to the second end of the valve sleeve 10. Here, the guide sleeve 51 may be formed by drawing, the gasket 52 may be formed by punching, and the guide sleeve 51 and the gasket 52 may be connected by riveting or welding. The above structure is adopted for connection, which makes the structure simple, the connection reliable, and the connection easy.

[0024] Specifically, a through hole is formed in the center of the seal member 40 , and the second end of the guide sleeve 51 passes through the through hole from the second end of the valve sleeve 10 and is connected and fixed to the gasket 52 .

[0025] Here, a limiting structure is provided at the first end of the guide sleeve 51, and the limiting structure is limitedly engaged with the second end of the valve sleeve 10 to limit the displacement of the guide sleeve 51 relative to the valve sleeve 10, thereby preventing the guide sleeve 51 from falling out of the valve sleeve 10. Specifically, a limiting cam is provided at the first end of the guide sleeve 51, and the limiting can be achieved by the engagement between the limiting cam and the inner wall of the valve sleeve 10. In this embodiment, an annular cam is provided on the inner wall of the valve sleeve 10, and the inner diameter of the annular cam is larger than the diameter of the main body of the guide sleeve 51, and the main body of the valve sleeve 10 passes through the annular cam and is limited by the overlapping of the limiting cam and the annular cam.

[0026] Specifically, a groove 41 is provided at one end of the sealing member 40 away from the valve sleeve 10, and the gasket 52 is positioned within the groove 41. The provision of the groove 41 provides a space for the gasket 52 to be placed, thereby reducing the overall space required. Also, contact between the gasket 52 and the valve port can be avoided as much as possible during operation.

[0027] In this embodiment, the spindle assembly further includes a positioning structure disposed between the second end of the valve sleeve 10 and the seal member 40. The positioning structure facilitates alignment and attachment of the valve sleeve 10 and the seal member 40, prevents the seal member 40 from shifting, and maintains the alignment of the seal member 40 with the valve orifice position to ensure effective sealing of the seal member 40 against the valve orifice.

[0028] Specifically, a first step structure 61 is provided on the end surface of the seal member 40 toward one end of the valve sleeve 10, and a second step structure 62 is provided on the end surface of the second end of the valve sleeve 10, and the first step structure and the second step structure are engaged with each other to form a positioning structure. Here, a cam is provided on the end surface of the seal member 40 toward one end of the valve sleeve 10 to form the first step structure 61, and the first step structure 61 is located in the center of the seal member 40, and a groove is provided on the end surface of the second end of the valve sleeve 10 to form the second step structure 62 correspondingly, and the cam and the groove are engaged with each other to realize centering and positioning. With the above structure, the seal member 40 can be quickly installed and the accuracy of the position of the seal member 40 can be ensured, and the sealing effect of the seal member 40 on the valve port can be ensured.

[0029] In this embodiment, by setting the outer diameter of the sealing member 40 to be the same as the outer diameter of the second end of the valve sleeve 10, it is possible to ensure contact and sealing between the sealing member 40 and the valve orifice 83 when the valve sleeve 10 moves to the valve orifice 83.

[0030] Specifically, the spindle assembly further includes a seal cover 70 fixed to a first end of the valve sleeve 10, and the seal cover 70 limits the displacement of the bush 20 in the valve sleeve 10. The seal cover 70 has a through hole, and the screw 82 passes through the through hole and is connected to the bush 20, and the seal cover 70 is used to limit the escape of the bush 20 from the valve sleeve 10.

[0031] 3 and 4, the electronic expansion valve provided in another embodiment of the present application includes a valve body 81, a screw 82 and a spindle assembly, where the valve body 81 has a valve port 83, the screw 82 is disposed in the valve body 81, the spindle assembly is the above-mentioned spindle assembly, which is movably disposed in the valve body 81 and disposed corresponding to the valve port 83, the screw 82 is drivingly connected to the bush 20 of the spindle assembly, and the screw 82 moves the valve sleeve 10 in conjunction with the bush 20 to realize the opening and closing of the valve port.

[0032] The above description is only a preferred embodiment of the present application, and is not intended to limit the present application. Those skilled in the art may make various modifications and changes to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application should be encompassed within the protection scope of the present application.

Claims

1. a valve sleeve (10) having a cavity and having opposed first and second ends; a bush (20) movably disposed within the cavity and located at a first end of the valve sleeve (10) for driving the valve sleeve (10) to move; a spring (30) disposed within the cavity, one end of the spring being connected to the bushing (20) and the other end of the spring being connected to the second end of the valve sleeve (10); a seal member (40) fixedly provided to the second end of the valve sleeve (10) for sealing the valve port (83); The valve orifice (83) has a tapered portion, and the valve orifice (83) is sealed by line contact between the seal member (40) and the tapered portion.

2. The spindle assembly of claim 1, further comprising a fastening member disposed between said valve sleeve (10) and said seal member (40) for fastening said seal member (40) to said valve sleeve (10).

3. The fixing member is a guide sleeve (51) having a first end located within the cavity and a second end passing through the second end of the valve sleeve (10) and the seal member (40), in sequence; 3. The spindle assembly of claim 2, further comprising: a gasket (52) connected to the second end of the guide sleeve (51).

4. 4. The spindle assembly of claim 3, wherein a first end of the guide sleeve (51) is engaged with a second end of the valve sleeve (10) to limit displacement of the guide sleeve (51) relative to the valve sleeve (10).

5. 4. The spindle assembly of claim 3, wherein the seal member (40) has an end remote from the valve sleeve (10) with a groove (41) and the gasket (52) is positioned within the groove (41).

6. The spindle assembly of claim 1, further comprising a positioning structure disposed between the second end of the valve sleeve (10) and the seal member (40).

7. 7. The spindle assembly of claim 6, wherein a first step structure (61) is provided on an end surface of the seal member (40) toward one end of the valve sleeve (10), and a second step structure (62) is provided on an end surface of a second end of the valve sleeve (10), and the first step structure and the second step structure are engaged with each other to form the positioning structure.

8. The spindle assembly of claim 1, wherein the seal member (40) has an outer diameter dimension that is the same as an outer diameter dimension of the second end of the valve sleeve (10).

9. 2. The spindle assembly of claim 1, further comprising a seal cover (70) fixedly mounted to a first end of the valve sleeve (10) to limit displacement of the bushing (20) within the valve sleeve (10).

10. A valve body (81) having a valve port (83); A screw (82) provided in the valve body (81); 10. An electronic expansion valve comprising: a spindle assembly according to claim 1 ; and a spindle assembly movably disposed within the valve body (81) and disposed corresponding to the valve port (83), wherein the screw (82) is drivingly connected to a bush of the spindle assembly, and the screw (82) moves a valve sleeve in conjunction with the bush.

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