Valve core assembly and electronic expansion valve

Abstract

The present application provides a valve core assembly and an electronic expansion valve, the valve core assembly including: a spring sleeve having opposite first and second ends, the first end of which is provided with an annular flange; a screw having one end passing through the annular flange and extending into the spring sleeve; a limiting assembly located within the spring sleeve, the limiting assembly including a gasket and a bushing, the gasket being rotatably fitted to the screw, the first end of the gasket abutting the annular flange, and the bushing being mounted on the screw and located at the second end of the gasket to limit the axial position of the gasket relative to the screw; a spindle having one end extending into the second end of the spring sleeve; and a spring located within the spring sleeve, one end abutting the gasket and the other end abutting the spindle. The technical aspects provided by the present application solve the problem in the related art that the friction force of the valve core assembly is too large, which affects the valve opening performance and lifespan.

Description

[Technical field]

[0001] This application claims priority to the following patent applications: 1) The priority of the patent application filed with the State Intellectual Property Office of the People's Republic of China on October 16, 2020, bearing application number 202011111737.2 and the invention title "Valve core assembly and electronic expansion valve"; 2) Priority of the patent application filed with the State Intellectual Property Office of China on October 16, 2020, bearing application number 202022319470.8 and titled “Valve Core Assembly and Electronic Expansion Valve”.

[0002] The present application relates to the technical field of electronic expansion valves, and in particular to a valve core assembly and an electronic expansion valve. [Background technology]

[0003] At present, an electronic expansion valve includes a housing and a valve core assembly, the valve core assembly is disposed in the housing, and the valve core assembly can open and close the valve, where the valve core assembly includes a spring sleeve, a spring, a bush, a compression sleeve, and a screw, the spring, the bush, and the compression sleeve are all disposed in the spring sleeve, the compression sleeve is fixedly connected to the spring sleeve, one end of the screw is inserted into the spring sleeve, the bush is welded to an end of the screw, and the spring is abutted against the bush such that the upper surface of the bush and the lower surface of the compression sleeve are in close contact with each other.

[0004] During the process of opening and closing the valve, the screw and bush are pressed directly against the compression sleeve by the spring. Therefore, when the screw and bush rotate relative to the compression sleeve, the frictional force between the bush and compression sleeve is too large, which not only affects the valve opening performance but also generates relative rotational friction between the spindle and the valve port, potentially shortening the product life.

[0005] Therefore, the related art has a problem that the friction force of the valve core assembly is too large, which affects the valve opening performance and lifespan. Summary of the Invention

[0006] The present application provides a valve core assembly and an electronic expansion valve that solves the problem in the related art that the friction force of the valve core assembly is too large, which affects the valve opening performance and lifespan.

[0007] According to one aspect of the present application, there is provided a valve core assembly including: a spring sleeve having opposing first and second ends, with an annular flange provided at the first end; a screw having one end penetrating the annular flange and extending into the spring sleeve; a limiting assembly located within the spring sleeve and including a gasket and a bushing, the gasket being rotatably fitted to the screw, the first end of the gasket abutting the annular flange, and the bushing being provided on the screw and located at the second end of the gasket, limiting the axial position of the gasket relative to the screw; a spindle having one end extending into the second end of the spring sleeve; and a spring located within the spring sleeve, one end abutting the gasket and the other end abutting the spindle.

[0008] When the technical aspects of the present application are applied, the valve core assembly includes a spring sleeve, a screw, a limiting assembly, a spindle, and a spring, the limiting assembly and the spring are both located in the spring sleeve, and the limiting assembly includes a gasket and a bushing. Here, an annular flange is provided at a first end of the spring sleeve, one end of the screw penetrates through the annular flange and enters the spring sleeve, and one end of the spindle enters the second end of the spring sleeve. The gasket is rotatably fitted to the screw, so that the bushing is provided on the screw and located at the second end of the gasket, and the axial position of the gasket relative to the screw can be restricted by the bushing, and one end of the spring abuts against the gasket and the other end of the spring abuts against the spindle, so that the first end of the gasket abuts against the annular flange under the action of the elastic force of the spring. Using the above-mentioned structure, during the process of opening and closing the valve, the gasket is rotatably fitted to the screw, the first end of the gasket is rotatable relative to the annular flange, and the second end of the gasket is rotatable relative to the bushing, which can reduce the friction force during the valve opening and closing process of the valve core assembly, and further improve the valve opening and closing performance.

[0009] Further, the screw includes a first step segment and a second step segment, the gasket is provided on the first step segment, and the bush is provided on the second step segment. Fitting The axial position of the gasket can be limited by the second step segment and the gasket. Fitting The axial position of the bush can be limited by the above. The use of a method of providing a step structure on the screw has the advantage of simplifying the structure and facilitating processing.

[0010] Further, the screw includes a first segment, a second segment, and a third segment that are connected in sequence and have successively smaller diameters, the second segment forms a first step segment, the third segment forms a second step segment, the gasket is fitted to the second segment, and the bush is fitted to the third segment and connected to the third segment. Since the screw has two step structures, the bush is provided on the third segment at the end and the bush is connected to the third segment, so that the position of the gasket on the screw can be restricted by the bush.

[0011] Furthermore, the first end of the gasket is abutted against the end wall of the first segment, the bush is abutted against the second end of the gasket, and the length dimension of the second segment is smaller than the thickness dimension of the gasket. By using the above-mentioned structure, there is a gap between the bush and the end wall of the second segment, which can prevent the bush from directly contacting the second segment, thereby reducing the friction force between the bush and the second segment, and further reducing the friction force during the valve opening and closing process of the valve core assembly, thereby improving the valve opening and closing performance.

[0012] Furthermore, a protrusion is provided on an end wall of a first end of the gasket, and the protrusion on the first end of the gasket abuts against an end wall and / or an annular flange of the first segment, and / or a protrusion is provided on an end wall of a second end of the gasket, and the protrusion on the second end of the gasket abuts against the bush. By providing the protrusion, the contact area between the gasket and the bush can be reduced, and thus the frictional force between the gasket and the bush can be further reduced. In addition, when welding the bush, the protrusion reduces the thermal effect on the gasket during welding between the bush and the screw, and damage to the gasket can be avoided.

[0013] Further, the protrusion includes an annular boss, and the annular boss is provided on the end wall of the gasket along the circumferential direction, or the protrusion includes a plurality of protruding points, and the plurality of protruding points are provided on the end wall of the gasket at intervals along the circumferential direction, or the protrusion includes a plurality of arc-shaped bosses, and the plurality of arc-shaped bosses are provided on the end wall of the gasket at intervals along the circumferential direction, or the protrusion includes a plurality of arc-shaped bosses and a plurality of protruding points, and the plurality of arc-shaped bosses are provided on the end wall of the gasket at intervals along the circumferential direction, and the protruding points are provided between two adjacent arc-shaped bosses. When the protrusion includes an annular boss structure, the gasket and the other member come into line-surface contact, and the frictional force of the gasket can be reduced compared to surface-surface contact. When the protrusion includes a protruding point structure, the gasket and the other member come into point-surface contact, and the frictional force of the gasket can be reduced compared to surface-surface contact. When the protrusion includes an arc-shaped boss structure, the gasket and the other member come into line-surface contact (similar to point-surface contact), and the frictional force of the gasket can be reduced compared to surface-surface contact. The protrusion has a protrusion point and an arc-shaped boss. Fitting When this structure is used, the gasket comes into point-surface contact and line-surface contact with another member, and the frictional force of the gasket can be reduced compared to surface-surface contact.

[0014] Furthermore, the height dimension of the protrusion is between 0.005 mm and 0.1 mm. By setting the height dimension of the protrusion within the above range, not only can the service life of the protrusion be guaranteed, but also the number of pulses of the device is not affected.

[0015] Furthermore, the first end of the gasket is abutted against the end wall of the first segment, the bush is abutted against the end wall of the second segment, and the length dimension of the second segment is greater than the thickness dimension of the gasket. With the above structure, the gasket has a certain axial movement space relative to the screw, which can further reduce the friction force between the gasket and other members during the process of opening and closing the valve. In addition, when the bush is fixed to the screw by welding, there is a gap between the second end of the gasket and the bush, so that the heat generated during welding of the bush is not transferred to the gasket, and the gasket is not damaged by heat. The bush is Tight fit When the bushing is pressed onto the screw using this method, the second segment can restrict the bushing, preventing the application of force to the gasket when the bushing is pressed onto the screw, and ensuring that the gasket is not damaged by the force.

[0016] Furthermore, the outer wall of the screw and the inner wall of the annular flange Clearance fit The outer wall of the gasket and the inner wall of the spring sleeve are Clearance fit The inner wall of the gasket and the outer wall of the screw are Clearance fit The above-mentioned structure ensures that there is no interference between the annular flange, the gasket and the screw during the process of the screw rotating relative to the spring sleeve, ensuring smooth rotation of the screw and reducing friction between each member. In addition, the above-mentioned members have a radial gap, that is, the screw may have a certain degree of freedom in the radial direction, so that it has a certain aligning function, which reduces the deviation of the coaxiality between the spindle member and the valve seat member during processing and assembly, improves the opening performance and reduces internal leakage.

[0017] Further, the valve core assembly further includes a pressure sleeve, the pressure sleeve being attached to the second end of the spring sleeve. With clearance fitThe spring sleeve is inserted into the pressing sleeve, and the outer wall of the spindle is provided with a limiting boss, which abuts against the end wall of the pressing sleeve to limit the axial position of the spindle in the spring sleeve. The above-mentioned structure has the advantage that by providing the pressing sleeve, when assembling the valve core assembly, each component can first be assembled into the spring sleeve through the second end of the spring sleeve, and then the pressing sleeve is fixed to the second end of the spring sleeve, which makes the assembly easier.

[0018] Furthermore, the gasket includes a fourth segment and a fifth segment connected to each other, the diameter of the fourth segment is larger than that of the fifth segment, the fourth segment is abutted against the annular flange, the spring sleeve is provided outside the fifth segment and the bush, and one end of the spring is abutted against the end wall of the fourth segment. By providing the gasket as the fourth segment and the fifth segment with different diameters, a step structure is formed between the fourth segment and the fifth segment, which makes it easier to assemble the spring and ensures that the outer wall of the spring does not interfere with the inner wall of the spring sleeve.

[0019] Furthermore, the gasket includes an engineering plastic member or a metal member having an anti-wear plating layer on the outer surface thereof. The above-mentioned structure can reduce the friction coefficient of the gasket, thereby further reducing the friction between the members and improving the valve opening performance, and can also improve the anti-wear property of the gasket, thereby improving the service life of the gasket.

[0020] According to another aspect of the present application, there is provided an electronic expansion valve including a housing, a rotor assembly rotatably disposed within the housing, a nut seat disposed within the housing, and a valve core assembly provided within the housing, the valve core assembly being the above-mentioned, the valve core assembly being disposed within the housing, the screw being inserted into the nut seat, and the rotor assembly being drivingly connected to the screw. Since the electronic expansion valve includes the above-mentioned valve core assembly, it can also reduce the friction force during the valve opening and closing process of the valve core assembly, and can further improve the valve opening and closing performance and lifespan. [Brief description of the drawings]

[0021] The drawings in the specification which form a part of this application are intended to provide a further understanding of the present application, and the schematic examples and their explanations are intended to help interpret the present application and do not constitute undue limitations on the present application.

[0022] [Figure 1] 1 shows a structural schematic diagram of a valve core assembly provided according to Example 1 of the present application. [Diagram 2] 2 shows an enlarged partial view of a portion A in FIG. [Diagram 3] 1 shows a structural schematic diagram of a valve core assembly provided according to Example 2 of the present application. [Figure 4] 4 shows an enlarged partial view of a portion B in FIG. [Diagram 5] 4 shows an assembly diagram of the screw, gasket and bush in FIG. 3. [Figure 6] 4 shows a cross-sectional view of the gasket in FIG. 3. [Figure 7] FIG. 4 shows a schematic diagram of the structure of the gasket in FIG. [Figure 8] FIG. 4 shows a schematic diagram of the structure of the gasket in FIG. [Figure 9] FIG. 4 shows a schematic diagram of the structure of the gasket in FIG. [Figure 10] FIG. 4 shows a schematic diagram of the structure of the gasket in FIG. [Figure 11] 1 shows a structural schematic diagram of a valve core assembly provided according to Example 3 of the present application. [Figure 12] 12 shows a partial enlarged view of a portion C in FIG. [Figure 13] 1 shows a structural schematic diagram of an electronic expansion valve provided in accordance with Example 4 of the present application. [Figure 14] 1 shows a structural schematic diagram of an electronic expansion valve provided in accordance with Example 4 of the present application. [Figure 15] 1 shows a structural schematic diagram of an electronic expansion valve provided in accordance with Example 4 of the present application.

[0023] Here, the above drawings include the following reference numbers: 10 spring sleeve, 11 annular flange, 20 screw, 21 first segment, 22 second segment, 23 third segment, 30 limit assembly, 31 gasket, 311 protrusion, 3111 annular boss, 3112 protrusion point, 312 fourth segment, 313 fifth segment, 32 bush, 40 spindle, 41 limit boss, 50 spring, 60 pressure sleeve, 70 housing, 80 rotor assembly, 90 nut seat. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] 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 some of the embodiments of the present application, and are not all of the embodiments. The following description of at least one exemplary embodiment is merely explanatory in nature and does not impose any restrictions on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the scope of protection of the present application.

[0025] 1 and 2, the first embodiment of the present application provides a valve core assembly, which includes a spring sleeve 10, a screw 20, a limiting assembly 30, a spindle 40 and a spring 50, and the limiting assembly 30 and the spring 50 are both located in the spring sleeve 10. Here, the spring sleeve 10 has a first end and a second end opposite to each other, the first end of the spring sleeve 10 is provided with an annular flange 11, one end of the screw 20 penetrates the annular flange 11 into the spring sleeve 10, and one end of the spindle 40 penetrates into the second end of the spring sleeve 10. Specifically, the limiting assembly 30 includes a gasket 31 and a bush 32, the gasket 31 is rotatably fitted to the screw 20, one end of a spring 50 is abutted against the gasket 31, the other end of the spring 50 is abutted against the spindle 40, and the first end of the gasket 31 is abutted against the annular flange 11 by the action of the elastic force of the spring 50, and the annular flange 11 can limit the gasket 31 from being separated from the inside of the spring sleeve 10. The bush 32 is provided on the screw 20 and positioned at the second end of the gasket 31, so that the bush 32 can limit the axial position of the gasket 31 relative to the screw 20, thereby preventing the gasket 31 from being separated from the screw 20.

[0026] When the valve core assembly provided by this embodiment is applied, the gasket 31 and the bush 32 Fitting As a result, during the valve opening and closing process, the gasket 31 is rotatably engaged with the screw 20, so that a first end of the gasket 31 is rotatable relative to the annular flange 11, and a second end of the gasket 31 is rotatable relative to the bush 32, and the multiple components of the valve core assembly are all capable of relative rotation, which can reduce the frictional force during the valve opening and closing process of the valve core assembly, and further improve the valve opening and closing performance and lifespan.

[0027] In this embodiment, the screw 20 includes a first step segment and a second step segment, the gasket 31 is provided on the first step segment, and the bush 32 is provided on the second step segment. Fitting The axial position of the gasket 31 can be limited by the second step segment and the gasket 31. Fitting This makes it possible to limit the axial position of the bush 32. The use of a method of providing a step structure on the screw 20 has the advantage of simplifying the structure and facilitating processing.

[0028] 2, in this embodiment, the screw 20 includes a first segment 21, a second segment 22, and a third segment 23 that are connected in sequence and have smaller diameters, the second segment 22 forms a first step segment, the third segment 23 forms a second step segment, the gasket 31 is fitted to the second segment 22, and the bush 32 is fitted to the third segment 23 and connected to the third segment 23. Since the screw 20 has two step structures, the bush 32 is provided in the third segment 23 at the end and connected to the third segment 23, so that the position of the gasket 31 on the screw 20 can be restricted by the bush 32.

[0029] Here, the bush 32 is Tight fit Alternatively, the bush 32 may be fixed to the third segment 23 by welding. Tight fit and then further fixed by laser welding, which not only ensures the strength of the connection of the bush 32, but also ensures the concentricity of the bush 32 and the screw 20.

[0030] 2, in this embodiment, the first end of the gasket 31 is abutted against the end wall of the first segment 21, the bush 32 is abutted against the second end of the gasket 31, and the length dimension of the second segment 22 is smaller than the thickness dimension of the gasket 31. Using the above structure, there is a gap between the end wall of the bush 32 and the second segment 22, which can prevent the bush 32 from directly contacting the second segment 22, thereby reducing the friction force between the bush 32 and the second segment 22, and further reducing the friction force during the valve opening and closing process of the valve core assembly, thereby improving the valve opening and closing performance.

[0031] As shown in FIG. 2, in this embodiment, the outer wall of the screw 20 and the inner wall of the annular flange 11 are Clearance fit The outer wall of the gasket 31 and the inner wall of the spring sleeve 10 are Clearance fit The inner wall of the gasket 31 and the outer wall of the screw 20 are Clearance fit By using the above-mentioned structure, no interference occurs between the annular flange 11, the gasket 31, and the screw 20 during the process of the screw 20 rotating relative to the spring sleeve 10, so that the screw 20 can be smoothly rotated and friction between each member can be reduced.

[0032] In addition, the above-mentioned members are provided with a radial gap (mainly between the inner wall of the gasket 31 and the outer wall of the screw 20). Clearance fit ), that is, the screw 20 may have a certain degree of freedom in the radial direction, so that it has a certain aligning function, which can reduce the deviation of the coaxiality between the spindle member and the valve seat member during processing and assembly, improve the valve opening performance, and reduce internal leakage.

[0033] As shown in FIG. 1 and FIG. 2, in this embodiment, the valve core assembly further includes a pressing sleeve 60, which is attached to the second end of the spring sleeve 10. With clearance fitThe spindle 40 is inserted into the pressing sleeve 60, and a limiting boss 41 is provided on the outer wall of the spindle 40, which abuts against the end wall of the pressing sleeve 60 to limit the axial position of the spindle 40 in the spring sleeve 10. Using the above-mentioned structure, by providing the pressing sleeve 60, when assembling the valve core assembly, each component can first be assembled into the spring sleeve 10 through the second end of the spring sleeve 10, and then the pressing sleeve 60 can be fixed to the second end of the spring sleeve 10, which has the advantage of facilitating assembly.

[0034] As shown in FIG. 2, in this embodiment, the gasket 31 includes a fourth segment 312 and a fifth segment 313 connected to each other, the diameter of the fourth segment 312 is larger than the diameter of the fifth segment 313, and the outer wall of the fourth segment 312 and the inner wall of the spring sleeve 10 are in contact with each other. Clearance fit Here, the upper surface of the fourth segment 312 is in contact with the lower surface of the annular flange 11, the spring 50 is fitted to the outside of the fifth segment 313 and the bush 32, and one end of the spring 50 is in contact with the end wall of the fourth segment 312.

[0035] By providing the gasket 31 as a fourth segment 312 and a fifth segment 313 of different diameters, a step structure is formed between the fourth segment 312 and the fifth segment 313, which makes it easier to assemble the spring 50 and ensures that the outer wall of the spring 50 does not interfere with the inner wall of the spring sleeve 10.

[0036] In this embodiment, the diameter of the fifth segment 313 is the same as the diameter of the bush 32, which makes it easier to assemble the spring 50 and ensures that the bush 32 does not interfere with the spring 50 during the deformation of the spring 50.

[0037] In this embodiment, the gasket 31 may be an engineering plastic member or a metal member, and if the gasket 31 is a metal member, a low friction coefficient, wear-resistant plating layer is provided on the outer surface of the metal member. The above-mentioned structure can reduce the friction coefficient of the gasket 31, thereby further reducing the frictional force between the members and improving the valve opening performance, and can also improve the wear resistance of the gasket 31, thereby improving the service life of the gasket 31.

[0038] As shown in Figures 3 to 10, Example 2 of the present application provides a valve core assembly, and the difference between Example 2 and Example 1 is that in Example 2, a protrusion 311 is provided on the end wall of the second end of the gasket 31, and the protrusion 311 at the second end of the gasket 31 is abutted against the bush 32. By providing the protrusion 311, the contact area between the gasket 31 and the bush 32 can be reduced, and thus the friction force between the gasket 31 and the bush 32 can be further reduced. In addition, when welding the bush 32, the protrusion 311 can reduce the heat influence on the gasket 31 during welding between the bush 32 and the screw 20, and avoid damage to the gasket.

[0039] In another embodiment, a protrusion 311 may be provided on the end wall of the first end of the gasket 31, and the protrusion 311 of the first end of the gasket 31 may abut against the end wall of the first segment 21 and the annular flange 11. Alternatively, the protrusion 311 of the first end of the gasket 31 abuts against the end wall of the first segment 21 or the annular flange 11.

[0040] Alternatively, protrusions 311 may be provided simultaneously on the end wall of the first end and the end wall of the second end of the gasket 31, thereby minimizing the frictional force between the gasket 31 and other members and improving the valve opening performance.

[0041] Here, the protrusion 311 includes the following four types of structures. The first type, the protrusion 311, includes an annular boss 3111, which is provided on the end wall of the gasket 31 along the circumferential direction (FIGS. 9 and 10). The second type, the projection 311 includes a plurality of projection points 3112 that are spaced apart along the circumferential direction on the end wall of the gasket 31 (FIGS. 7 and 8). A third type, the projection 311, includes a plurality of arcuate bosses that are circumferentially spaced apart on the end wall of the gasket 31. The fourth type, the protrusion portion 311 includes a plurality of arc-shaped bosses and a plurality of protrusion points 3112, the plurality of arc-shaped bosses are provided on the end wall of the gasket 31 at intervals along the circumferential direction, and the protrusion points 3112 are provided between two adjacent arc-shaped bosses.

[0042] When the protrusion 311 has an annular boss 3111 structure (first type of structure), the gasket 31 comes into line-surface contact with other components, and the frictional force of the gasket 31 can be reduced compared to surface-surface contact.

[0043] When the protrusion 311 has a structure of protrusion points 3112 (second type of structure), the gasket 31 comes into point-to-surface contact with another member, and the frictional force of the gasket 31 can be reduced compared to surface-to-surface contact.

[0044] When an arc-shaped boss structure is used for the protrusion portion 311 (third type of structure), the gasket 31 comes into line-surface contact with the other component (similar to point-surface contact), and the frictional force of the gasket 31 can be reduced compared to surface-surface contact.

[0045] The protrusion 311 has a protrusion point 3112 and an arc-shaped boss. Fitting When a structure having this configuration (fourth type of structure) is used, the gasket 31 comes into point-surface contact and line-surface contact with another member, and the frictional force of the gasket 31 can be reduced compared to surface-surface contact.

[0046] In this embodiment, the height of the protrusion 311 is between 0.005 mm and 0.1 mm. By setting the height of the protrusion 311 within the above range, the service life of the protrusion 311 can be guaranteed, and the number of pulses of the device is not affected. If the height of the protrusion 311 is less than 0.005 mm or more than 0.1 mm, the service life of the protrusion 311 and the number of pulses of the device cannot be guaranteed.

[0047] As shown in Figures 11 and 12, Example 3 of the present application provides a valve core assembly, and the difference between Example 3 and Example 1 is that in Example 3, the first end of the gasket 31 abuts against the end wall of the first segment 21, the bush 32 abuts against the end wall of the second segment 22, and the length dimension of the second segment 22 is greater than the thickness dimension of the gasket 31, and there is a gap between the second end of the gasket 31 and the bush 32. With the above-mentioned structure, the gasket 31 has a certain axial movement space relative to the screw 20, which can further reduce the friction force between the gasket 31 and other members during the process of opening and closing the valve.

[0048] In addition, when the bush 32 is fixed to the screw 20 by welding, there is a gap between the second end of the gasket 31 and the bush 32, so that the heat generated during welding of the bush 32 is not transferred to the gasket 31, and the gasket 31 is not damaged by the heat. Tight fit When the above method is used to press-fit the screw 20, the second segment 22 can restrict the bushing 32, thereby preventing the application of force to the gasket 31 when the bushing 32 is pressed-fit, and ensuring that the gasket 31 is not damaged by the force.

[0049] As shown in Figures 13 to 15, a fourth embodiment of the present application provides an electronic expansion valve, which includes a housing 70, a rotor assembly 80, a nut seat 90 and a valve core assembly, the rotor assembly 80, the nut seat 90 and the valve core assembly are all installed in the housing 70, and the valve core assembly is the valve core assembly provided above. Here, the rotor assembly 80 is rotatably installed in the housing 70, the screw 20 of the valve core assembly is inserted into the nut seat 90, and the rotor assembly 80 is drivingly connected to the screw 20 to drive the valve core assembly to move relative to the valve port, and further realizes the opening and closing of the valve.

[0050] Here, the valve core assembly in FIG. 13 is the valve core assembly in the first embodiment, the valve core assembly in FIG. 14 is the valve core assembly in the second embodiment, and the valve core assembly in FIG.

[0051] Since this electronic expansion valve includes the valve core assembly provided above, it can similarly reduce the friction force during the valve opening and closing process of the valve core assembly, and further improve the valve opening and closing performance.

[0052] The device provided by the embodiment has the following beneficial effects: (1) By installing a gasket, the frictional force between each component of the expansion valve when it is open and closed can be reduced, preventing wear between the spindle and the valve port, and improving the valve opening performance and lifespan. (2) The screw has a certain degree of radial freedom and a certain aligning function, which can reduce the deviation of the concentricity between the spindle member and the valve seat member during processing and assembly, improve the valve opening performance, and reduce internal leakage.

[0053] The above is only a preferred embodiment of the present application, and is not intended to limit the present application, and those skilled in the art can make various modifications and variations to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. a spring sleeve (10) having an opposed first end and an open second end, the first end being provided with an inwardly facing annular flange (11); a screw (20) having one end penetrating the annular flange (11) and entering the spring sleeve (10); a limiting assembly (30) located within the spring sleeve (10) and including a gasket (31) and a bushing (32), the gasket (31) being rotatably fitted to the screw (20), a first end of the gasket (31) being in contact with the annular flange (11), and the bushing (32) being provided on the screw (20) and located at a second end of the gasket (31), limiting an axial position of the gasket (31) relative to the screw (20); a spindle (40) having one end extending into the second end of the spring sleeve (10) and movably mounted within the spring sleeve (10); a spring (50) located within the spring sleeve (10), one end of which is in contact with the gasket (31) and the other end of which is in contact with the spindle (40); Including, The screw (20) includes a first segment (21) and a second segment (22) connected in series and having successively smaller diameters, A first end of the gasket (31) abuts against an end wall of the first segment (21); The gasket (31) comprises an engineering plastic member or a metal member having an abrasion-resistant plating layer on its outer surface.

2. 2. The valve core assembly according to claim 1, wherein the screw (20) includes a first step segment and a second step segment, the gasket (31) is provided on the first step segment, and the bush (32) is provided on the second step segment.

3. 3. The valve core assembly according to claim 2, wherein the screw (20) includes a third segment (23), the second segment (22) forms the first step segment, the third segment (23) forms the second step segment, the gasket (31) is fitted to the second segment (22), and the bush (32) is fitted to the third segment (23) and connected to the third segment (23).

4. 4. The valve core assembly according to claim 3, wherein the bush (32) is abutted against the second end of the gasket (31), and the length dimension of the second segment (22) is smaller than the thickness dimension of the gasket (31).

5. a protrusion (311) is provided on an end wall of a first end of the gasket (31), the protrusion (311) of the first end of the gasket (31) abutting against an end wall of the first segment (21) and / or the annular flange (11); and / or 5. The valve core assembly according to claim 4, wherein an end wall of the second end of the gasket (31) is provided with a protrusion (311), and the protrusion (311) of the second end of the gasket (31) abuts against the bush (32).

6. The protrusion (311) includes an annular boss (3111), the annular boss (3111) being provided on the end wall of the gasket (31) along a circumferential direction, or The protrusion (311) includes a plurality of protrusion points (3112), the plurality of protrusion points (3112) being provided on the end wall of the gasket (31) at intervals along the circumferential direction, or the projection (311) includes a plurality of arcuate bosses, the plurality of arcuate bosses being circumferentially spaced apart on the end wall of the gasket (31); or The valve core assembly according to claim 5, wherein the protrusion portion (311) includes a plurality of arc-shaped bosses and a plurality of protrusion points (3112), the plurality of arc-shaped bosses being provided on the end wall of the gasket (31) at intervals along the circumferential direction, and the protrusion points (3112) being provided between two adjacent arc-shaped bosses.

7. The valve core assembly according to claim 5, wherein the height dimension of the protrusion (311) is between 0.005 mm and 0.1 mm.

8. 4. The valve core assembly of claim 3, wherein a first end of the gasket (31) is abutted against an end wall of the first segment (21), the bushing (32) is abutted against an end wall of the second segment (22), and a length dimension of the second segment (22) is greater than a thickness dimension of the gasket (31).

9. 9. The valve core assembly according to claim 1, wherein an outer wall of the screw (20) and an inner wall of the annular flange (11) are in clearance fit with each other, an outer wall of the gasket (31) and an inner wall of the spring sleeve (10) are in clearance fit with each other, and an inner wall of the gasket (31) and an outer wall of the screw (20) are in clearance fit with each other.

10. The valve core assembly according to any one of claims 1 to 8, further comprising a pressing sleeve (60), the pressing sleeve (60) being inserted into the second end of the spring sleeve (10) with a press fit, the spindle (40) being inserted into the pressing sleeve (60), the outer wall of the spindle (40) being provided with a limiting boss (41), the limiting boss (41) being abutted against the end wall of the pressing sleeve (60) to limit the axial position of the spindle (40) within the spring sleeve (10).

11. 9. The valve core assembly according to claim 1, wherein the gasket (31) includes a fourth segment (312) and a fifth segment (313) connected to each other, the diameter of the fourth segment (312) being larger than the diameter of the fifth segment (313), the fourth segment (312) being abutted against the annular flange (11), the spring (50) being fitted to the outside of the fifth segment (313) and the bush (32), and one end of the spring (50) being abutted against an end wall of the fourth segment (312).

12. A housing (70); a rotor assembly (80) rotatably mounted within the housing (70); A nut seat (90) provided in the housing (70); a valve core assembly according to any one of claims 1 to 11, which is provided in the housing (70), a screw (20) is inserted in the nut seat (90), and the rotor assembly (80) is drivingly connected to the screw (20); Including an electronic expansion valve.

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