Electronic expansion valve

Abstract

The utility model provides an electronic expansion valve, and relates to the field of valves. The electronic expansion valve comprises a valve seat, a valve needle, a limiting guide piece, a driving nut, a rotor assembly and a sleeve. The valve seat is provided with a valve cavity, a first opening and a second opening, wherein the first opening and the second opening communicate with the valve cavity. The valve needle is installed in the valve cavity. The limiting guide piece is arranged in the mounting groove and connected with the valve seat in a clamped mode, and the limiting guide piece is provided with a limiting guide groove. The driving nut is installed in the limiting guide groove and connected with the valve needle, and the limiting guide groove can limit rotation of the driving nut. The rotor assembly is rotatably mounted on the limiting guide part, a rotating shaft of the rotor assembly is inserted into the limiting guide groove and is in transmission connection with the driving nut through threads, the sleeve is inserted into the mounting groove, and the bottom end of the sleeve abuts against the limiting guide part. The bottom end of the sleeve is welded to the top end of the valve seat. Welding of the electronic expansion valve during assembly can be simplified.

Description

Technical Field

[0001] The utility model relates to the field of valves, and more particularly to an electronic expansion valve. Background Art

[0002] An electronic expansion valve is a precision flow control component in a modern refrigeration system, mainly used to accurately regulate the refrigerant flow rate to ensure that the refrigeration system maintains an ideal operating state under different working conditions. Its main working principle is an adjustable valve driven by an electromagnetic coil. According to the electrical signal sent by the refrigeration system controller, the electromagnetic coil generates a magnetic field to drive the valve core to move, thereby changing the valve opening and achieving precise control of the refrigerant flow rate.

[0003] In the assembly process of the existing electronic expansion valve, there are many positions that need to be welded and assembled, resulting in a complex assembly process and high cost of the electronic expansion valve. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an electronic expansion valve, which can simplify the welding during the assembly of the electronic expansion valve.

[0005] The embodiments of the utility model are implemented as follows:

[0006] The utility model provides an electronic expansion valve, comprising:

[0007] A valve seat, which is provided with a valve cavity, a first opening and a second opening communicating with the valve cavity. The first opening is arranged at one end in the axial direction of the valve seat, and an installation groove is arranged at the other end in the axial direction of the valve seat;

[0008] A valve needle, which is movably installed in the valve cavity, and the movement of the valve needle can adjust the flow rate between the first opening and the second opening;

[0009] A limit guiding member, which is arranged in the installation groove and is clamped with the valve seat. The limit guiding member is provided with a limit guiding groove;

[0010] A driving nut, which is installed in the limit guiding groove and is connected with the valve needle. The limit guiding groove can limit the rotation of the driving nut;

[0011] A rotor assembly, which is rotatably installed on the limit guiding member, and the rotating shaft of the rotor assembly is inserted into the limit guiding groove and is in threaded transmission connection with the driving nut. The rotation of the rotor assembly can drive the driving nut to slide along the limit guiding groove;

[0012] A sleeve, the sleeve is in a cylindrical shape with a closed top end and an open bottom end, one end of the open sleeve is inserted into the installation groove, and the bottom end of the sleeve abuts against the limit guiding member;

[0013] The bottom end of the sleeve is welded to the top end of the valve seat.

[0014] In an alternative embodiment, a boss is provided on one of the bottom surface of the limit guiding member and the bottom surface of the installation groove, and a positioning groove cooperating with the boss is provided on the other;

[0015] The boss is inserted into the positioning groove to enable the limit guiding member to be clamped with the valve seat.

[0016] In an alternative embodiment, an abutting ring platform is provided at the bottom end of the limit guiding member, and the abutting ring platform cooperates with the installation groove;

[0017] The limit guiding member is installed in the installation groove through the abutting ring platform;

[0018] The bottom end of the sleeve abuts against the abutting ring platform.

[0019] In an alternative embodiment, the height of the abutting ring platform is less than the depth of the installation groove, so that the bottom end of the sleeve can be inserted into the installation groove.

[0020] In an alternative embodiment, a sleeved ring platform is provided above the abutting ring platform, the diameter of the sleeved ring platform is smaller than that of the abutting ring platform, and it matches the inner diameter of the sleeve;

[0021] The bottom of the sleeve is sleeved on the sleeved ring platform.

[0022] In an alternative embodiment, an avoidance groove is provided on the outer peripheral edge of the sleeved ring platform, and the bottom surface of the avoidance groove is flush with the abutting ring platform.

[0023] In an alternative embodiment, a chamfer is provided at the top end of the installation groove.

[0024] In an alternative embodiment, the rotor assembly includes a rotating shaft, a bearing and a magnetic member;

[0025] The rotating shaft is connected to the magnetic member, and the rotating shaft is installed in the inner ring of the bearing;

[0026] The limit guiding member is in a stepped shaft shape and includes a first section, a second section and a third section with diameters increasing in sequence;

[0027] The third section is installed in the installation groove;

[0028] The sleeve is sleeved on the second section and abuts against the top surface of the third section;

[0029] The limiting and guiding groove is arranged on the bottom wall of the limiting and guiding member and is recessed upward, and a bearing mounting groove is arranged on the top surface of the first section;

[0030] The bearing mounting groove communicates with the guiding and limiting groove;

[0031] The bearing is mounted in the bearing mounting groove, and the rotating shaft is in threaded transmission with the driving nut.

[0032] In an alternative embodiment, the electronic expansion valve further includes a top fixing member;

[0033] The top fixing member is provided with a limiting hole, and the diameter of the top fixing member matches the inner diameter of the sleeve;

[0034] The top fixing member is mounted in the sleeve and abuts against the top end of the sleeve;

[0035] The top end of the rotating shaft protrudes out of the magnetic member and is rotatably inserted into the limiting hole.

[0036] In an alternative embodiment, through holes are provided on the periphery of the top fixing member;

[0037] A downwardly protruding limiting ring platform is provided on the periphery of the limiting hole;

[0038] The limiting ring platform abuts against the top surface of the magnetic member.

[0039] The beneficial effects of the electronic expansion valve provided by the embodiment of the present utility model are as follows: including,

[0040] In this application, an installation groove is provided at the top end of the valve seat, and the limiting and guiding member that restricts the rotation of the limiting nut is mounted in the installation groove and is clamped with the installation groove. Then, the bottom end of the sleeve is inserted into the installation groove, and the bottom end of the sleeve abuts against the limiting and guiding member. After welding the sleeve and the valve seat in this way, the bottom end surface of the sleeve and the bottom wall of the installation groove will act on the limiting and guiding member, and the clamping of the limiting and guiding member with the installation groove will limit the rotation of the limiting and guiding member. In this way, the assembly between the limiting and guiding member and the base does not require welding, and the rotor assembly is rotatably mounted on the limiting and guiding member, so that there is no need to weld a bearing seat at the top end of the sleeve. Overall, the assembly of the electronic expansion valve can be achieved with only one welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0042] Figure 1 A schematic cross-sectional structure view of the electronic expansion valve provided by an embodiment of the present utility model;

[0043] Figure 2 is Figure 1 an enlarged structure view at position A in

[0044] Figure 3 A schematic structure view of the limit guiding member of the electronic expansion valve provided by an embodiment of the present utility model;

[0045] Figure 4 A schematic structure view of the top fixing member of the electronic expansion valve provided by an embodiment of the present utility model.

[0046] Reference numerals: 100 - electronic expansion valve; 110 - valve seat; 111 - valve cavity; 113 - first opening; 115 - second opening; 117 - mounting groove; 119 - positioning groove; 121 - chamfer; 130 - valve needle; 150 - limit guiding member; 151 - limit guiding groove; 153 - boss; 155 - abutting ring platform; 157 - sleeved ring platform; 159 - avoidance groove; 161 - first section; 163 - second section; 165 - third section; 167 - bearing mounting groove; 170 - drive nut; 190 - rotor assembly; 191 - rotating shaft; 193 - bearing; 195 - magnetic member; 197 - retaining ring; 210 - sleeve; 230 - top fixing member; 231 - limit hole; 233 - through hole; 235 - limit ring platform. Detailed implementation manners

[0047] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated in the accompanying drawings herein can be arranged and designed in various different configurations.

[0048] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but is merely representative of selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0049] It should be noted that: like reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0050] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this utility model is customarily placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, terms such as "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0051] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0052] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0053] Embodiment

[0054] The inventor found that for existing electronic expansion valves, such as the invention patent with the application number 202311038798.4, three weldings are required during the assembly process, namely the welding between the valve seat and the limit seat, the welding between the limit seat and the sleeve, and the welding between the bearing seat and the sleeve, resulting in a complex assembly process and high costs.

[0055] Please refer to Figure 1 , to solve the above problems, an embodiment of the present utility model provides an electronic expansion valve 100. The electronic expansion valve 100 can reduce the number of welding sides during assembly, and even the assembly of the electronic expansion valve 100 can be achieved by welding in sequence.

[0056] Please refer to Figure 1, in this embodiment, the electronic expansion valve 100 includes a valve seat 110, a valve needle 130, a limiting and guiding member 150, a driving nut 170, a rotor assembly 190, and a sleeve 210. The valve seat 110 is provided with a valve cavity 111, a first opening 113 and a second opening 115 communicating with the valve cavity 111. The first opening 113 is disposed at one end of the valve seat 110 in the axial direction, and an installation groove 117 is provided at the other end of the valve seat 110 in the axial direction. The valve needle 130 is movably installed in the valve cavity 111, and the movement of the valve needle 130 can adjust the flow rate between the first opening 113 and the second opening 115. The limiting and guiding member 150 is disposed in the installation groove 117 and is snap-connected to the valve seat 110. The limiting and guiding member 150 is provided with a limiting and guiding groove 151. The driving nut 170 is installed in the limiting and guiding groove 151 and is connected to the valve needle 130. The limiting and guiding groove 151 can limit the rotation of the driving nut 170. The rotor assembly 190 is rotatably installed on the limiting and guiding member 150, and the rotating shaft 191 of the rotor assembly 190 is inserted into the limiting and guiding groove 151 and is in threaded transmission connection with the driving nut 170. The rotation of the rotor assembly 190 can drive the driving nut 170 to slide along the limiting and guiding groove 151. The sleeve 210 is in the shape of a cylinder with a closed top end and an open bottom end. The open end of the sleeve 210 is inserted into the installation groove 117, and the bottom end of the sleeve 210 abuts against the limiting and guiding member 150. The bottom end of the sleeve 210 is welded to the top end of the valve seat 110.

[0057] In this embodiment, by providing the installation groove 117 at the top end of the valve seat 110, installing the limiting and guiding member 150 that restricts the rotation of the nut in the installation groove 117 and snap-connecting it with the installation groove 117, then inserting the bottom end of the sleeve 210 into the installation groove 117 and making the bottom end of the sleeve 210 abut against the limiting and guiding member 150. After welding the sleeve 210 to the valve seat 110 in this way, the bottom end surface of the sleeve 210 and the bottom wall of the installation groove 117 will act on the limiting and guiding member 150, and the snap-connection between the limiting and guiding member 150 and the installation groove 117 will restrict the rotation of the limiting and guiding member 150. In this way, the assembly between the limiting and guiding member 150 and the base does not require welding. And the rotor assembly 190 is rotatably installed on the limiting and guiding member 150, so that there is no need to weld the bearing 193 seat at the top end of the sleeve 210. Overall, the assembly of the electronic expansion valve 100 can be achieved with only one welding.

[0058] It should be noted that the rotor assembly 190 is rotatably installed on the limiting and guiding member 150. In this way, the limiting and guiding member 150 can restrict the movement of the rotor assembly 190, and the rotor assembly 190 can rotate relative to the limiting and guiding member 150. The rotation of the rotor assembly 190 can drive the driving nut 170 that is in threaded cooperation with it to slide along the limiting and guiding groove 151. Since the valve needle 130 is connected to the driving nut 170, the valve needle 130 is driven to move, so that the flow rate between the first opening 113 and the second opening 115 can be controlled.

[0059] Please refer to Figure 1 and Figure 2 In this embodiment, a boss 153 is provided on one of the bottom surface of the limit guiding member 150 and the bottom surface of the mounting groove 117, and a positioning groove 119 that cooperates with the boss 153 is provided on the other. The boss 153 is inserted into the positioning groove 119 so that the limit guiding member 150 is snap-fitted with the valve seat 110.

[0060] In this embodiment, by providing the boss 153 and the positioning groove 119 on the bottom walls of the limit guiding member 150 and the mounting groove 117 respectively for snap-fitting, the positioning and limit snap-fitting between the limit guiding member 150 and the valve seat 110 can be conveniently achieved.

[0061] Of course, in some other embodiments of the present application, the position where the limit guiding member 150 cooperates with the mounting groove 117 can also be set to be non-circular, so as to restrict the rotation of the limit guiding member 150 relative to the valve seat 110.

[0062] Please refer to Figure 1 、 Figure 2 and Figure 3 In this embodiment, the limit guiding member 150 is in the shape of a stepped shaft and includes a first section 161, a second section 163, and a third section 165 with diameters increasing in sequence. An abutting ring platform 155 is formed in the region where the third section 165 protrudes from the second section 163, and the abutting ring platform 155 cooperates with the mounting groove 117. The limit guiding member 150 is installed in the mounting groove 117 through the abutting ring platform 155. The bottom end of the sleeve 210 abuts against the abutting ring platform 155.

[0063] In this embodiment, by setting the limit guiding member 150 in a stepped shape so that an abutting ring platform 155 is formed in the region where the third section 165 protrudes from the second section 163, after the sleeve 210 is inserted into the mounting groove 117, the end of the sleeve 210 abuts against the abutting ring platform 155, thereby realizing the stable fixation of the limit guiding member 150.

[0064] In this embodiment, the height of the abutting ring platform 155 is less than the depth of the mounting groove 117 so that the bottom end of the sleeve 210 can be inserted into the mounting groove 117.

[0065] In this embodiment, the height of the abutting ring platform 155, that is, the height of the third section 165, is set to be less than the depth of the mounting groove 117, so that the sleeve 210 can also be inserted into the mounting groove 117 when the sleeve 210 abuts against the top surface of the abutting ring platform 155, thereby facilitating the welding between the sleeve 210 and the valve seat 110.

[0066] In this embodiment, the part of the second section 163 of the limit guiding member 150 that extends beyond the first section 161 is located above the abutting annular platform 155 to form a sleeving annular platform 157. The diameter of the sleeving annular platform 157 is smaller than that of the abutting annular platform 155 and matches the inner diameter of the sleeve 210. The bottom of the sleeve 210 is sleeved on the sleeving annular platform 157.

[0067] In this application, by setting the diameter of the second section 163 to match the inner diameter of the sleeve 210, the sleeve 210 can be inserted on the outer peripheral edge of the second section 163, so as to improve the deformation during the welding between the cylinder body and the valve seat 110 and affect the installation accuracy.

[0068] Furthermore, a guiding surface is provided at the top of the second section 163, and the guiding surface gradually narrows towards the top of the second section 163, so that the sleeve 210 can be conveniently inserted on the second section 163.

[0069] Please refer to Figure 1 、 Figure 2 and Figure 3 , in this embodiment, an avoidance groove 159 is provided on the outer peripheral edge of the sleeving annular platform 157, and the bottom surface of the avoidance groove 159 is flush with the abutting annular platform 155.

[0070] In this embodiment, by providing the bottom avoidance groove 159, a position for deformation can be reserved for the bottom end of the sleeve 210 during welding.

[0071] In this embodiment, a chamfer 121 is provided at the top end of the installation groove 117. The provision of the chamfer 121 can facilitate the insertion of the bottom end of the sleeve 210 into the installation groove 117.

[0072] Please refer to Figure 1 、 Figure 2 and Figure 3 , in this embodiment, the rotor assembly 190 includes a rotating shaft 191, a bearing 193, and a magnetic member 195. The rotating shaft 191 is connected to the magnetic member 195, and the rotating shaft 191 is installed in the inner ring of the bearing 193. The third section 165 is installed in the installation groove 117. The sleeve 210 is sleeved on the second section 163 and abuts against the top surface of the third section 165. The limit guiding groove 151 is provided on the bottom wall of the limit guiding member 150 and is recessed upward. A bearing installation groove 167 is provided on the top surface of the first section 161. The bearing installation groove 167 communicates with the guiding limit groove. The bearing 193 is installed in the bearing installation groove 167, and the rotating shaft 191 is in threaded transmission with the driving nut 170.

[0073] In this embodiment, by installing the bearing 193 on the limit guiding member 150, compared with the existing installation on the top, there is no need to weld the bearing 193 seat to the sleeve 210.

[0074] In this embodiment, the magnetic member 195 includes a magnet and a mounting block, and the magnet and the mounting block are integrally formed by injection molding.

[0075] In this embodiment, a retaining ring 197 is provided on the top of the bearing 193. The retaining ring 197 can limit the relative movement of the rotating shaft 191 with respect to the rotating shaft 191 and prevent the bearing 193 from coming out of the bearing mounting groove 167.

[0076] In this embodiment, the electronic expansion valve 100 further includes a top fixing member 230. The top fixing member 230 is provided with a limiting hole 231, and the diameter of the top fixing member 230 matches the inner diameter of the sleeve 210. The top fixing member 230 is installed inside the sleeve 210 and abuts against the top end of the sleeve 210. The top end of the rotating shaft 191 protrudes out of the magnetic member 195 and is rotatably inserted into the limiting hole 231.

[0077] In this embodiment, a top limiting and guiding member 150 is provided, which can be pressed into the sleeve 210 so that the top end of the rotating shaft 191 is inserted into the limiting hole 231, thereby improving the rotational stability of the rotor assembly 190.

[0078] Please refer to Figure 4 , in this embodiment, the top fixing member 230 is made by injection molding. Through holes 233 are provided on the periphery of the top fixing member 230. The through holes 233 can exhaust air when the top injection molding is pressed into the sleeve 210. A downwardly protruding limiting ring platform 235 is provided on the periphery of the limiting hole 231. The limiting ring platform 235 abuts against the top surface of the magnetic member 195, which can realize the stable installation between the top fixing member 230 and the rotor assembly 190.

[0079] In this embodiment, a guide groove is provided at the top end of the valve needle 130, and the guide groove is connected to the drive nut 170 through a sliding shaft. A spring is also provided between the valve needle 130 and the drive nut 170. In this way, the cooperation of the guide groove and the spring can enable the valve needle 130 to be subjected to force in sequence relative to the drive nut 170 for short-distance floating.

[0080] In summary, the working principle and beneficial effects of the electronic expansion valve 100 provided by the embodiment of the present invention include:

[0081] In this embodiment, an installation groove 117 is provided at the top of the valve seat 110, and a limiting and guiding member 150 that restricts the rotation of the limiting nut is installed in the installation groove 117 and is snap-fitted with the installation groove 117. Then, the bottom end of the sleeve 210 is inserted into the installation groove 117, and the bottom end of the sleeve 210 abuts against the limiting and guiding member 150. After welding the sleeve 210 to the valve seat 110 in this way, the bottom end surface of the sleeve 210 and the bottom wall of the installation groove 117 will act on the limiting and guiding member 150, and the snap-fitting of the limiting and guiding member 150 with the installation groove 117 will restrict the rotation of the limiting and guiding member 150. In this way, the assembly between the limiting and guiding member 150 and the base does not require welding. And the rotor assembly 190 is rotatably installed on the limiting and guiding member 150, so that there is no need to weld a bearing 193 seat at the top end of the sleeve 210. Overall, the assembly of the electronic expansion valve 100 can be achieved with only one welding operation.

[0082] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An electronic expansion valve, characterized in that: include: A valve seat (110), the valve seat (110) being provided with a valve cavity (111) and a first opening (113) and a second opening (115) communicating with the valve cavity (111), the first opening (113) being provided at one end of the valve seat (110) in the axial direction, and a mounting groove (117) being provided at the other end of the valve seat (110) in the axial direction; A valve needle (130), the valve needle (130) is movably installed in the valve cavity (111), and the movement of the valve needle (130) can adjust the flow rate between the first opening (113) and the second opening (115); A position limiting guide member (150), wherein the position limiting guide member (150) is disposed in the mounting groove (117) and is clamped with the valve seat (110), and the position limiting guide member (150) is provided with a position limiting guide groove (151); A driving nut (170), wherein the driving nut (170) is mounted in the limiting guide groove (151) and connected to the valve needle (130), and the limiting guide groove (151) can limit the rotation of the driving nut (170); A rotor assembly (190) is rotatably mounted on the limiting guide member (150), and a rotating shaft (191) of the rotor assembly (190) is inserted into the limiting guide groove (151) and is connected to the driving nut (170) through threaded transmission. The rotation of the rotor assembly (190) can drive the driving nut (170) to slide along the limiting guide groove (151); A sleeve (210), the sleeve (210) is in the shape of a tube with a closed top and an open bottom, one open end of the sleeve (210) is inserted into the mounting groove (117), and the bottom end of the sleeve (210) is in contact with the limiting guide member (150); The bottom end of the sleeve (210) is welded to the top end of the valve seat (110).

2. The electronic expansion valve according to claim 1, characterized in that: One of the bottom surface of the limiting guide member (150) and the bottom surface of the installation groove (117) is provided with a boss (153), and the other is provided with a positioning groove (119) matched with the boss (153); The boss (153) is inserted into the positioning groove (119) so that the limiting guide member (150) is engaged with the valve seat (110).

3. The electronic expansion valve according to claim 1 or 2, characterized in that: A contact ring platform (155) is provided at the bottom end of the position-limiting guide member (150), and the contact ring platform (155) cooperates with the installation groove (117); The limiting guide member (150) is installed in the installation groove (117) via the abutting ring platform (155); The bottom end of the sleeve (210) abuts against the abutment ring platform (155).

4. The electronic expansion valve according to claim 3, characterized in that: The height of the abutment ring platform (155) is smaller than the depth of the installation groove (117), so that the bottom end of the sleeve (210) can be inserted into the installation groove (117).

5. The electronic expansion valve according to claim 3, characterized in that: A sleeve ring platform (157) is arranged above the abutting ring platform (155); the diameter of the sleeve ring platform (157) is smaller than the diameter of the abutting ring platform (155) and matches the inner diameter of the sleeve (210); The bottom of the sleeve (210) is sleeved on the sleeve ring (157).

6. The electronic expansion valve according to claim 5, characterized in that: An escape groove (159) is provided on the outer periphery of the sleeved ring platform (157), and the bottom surface of the escape groove (159) is flush with the abutting ring platform (155).

7. The electronic expansion valve according to claim 1 or 2, characterized in that: The top end of the mounting groove (117) is provided with a chamfer (121).

8. The electronic expansion valve according to claim 1 or 2, characterized in that: The rotor assembly (190) includes a rotating shaft (191), a bearing (193) and a magnetic component (195); The rotating shaft (191) is connected to the magnetic component (195), and the rotating shaft (191) is installed on the inner ring of the bearing (193); The position limiting guide (150) is in the shape of a stepped shaft, and comprises a first section (161), a second section (163) and a third section (165) whose diameters increase successively; The third section (165) is installed in the installation groove (117); The sleeve (210) is sleeved on the second section (163) and abuts against the top surface of the third section (165); The limiting guide groove (151) is arranged on the bottom wall of the limiting guide member (150) and is concave upwards, and a bearing installation groove (167) is arranged on the top surface of the first section (161); The bearing installation groove (167) is in communication with the limiting guide groove (151); The bearing (193) is installed in the bearing installation groove (167), and the rotating shaft (191) and the driving nut (170) are threadedly driven.

9. The electronic expansion valve according to claim 8, characterized in that: The electronic expansion valve further comprises a top fixing member (230); The top fixing member (230) is provided with a limiting hole (231), and the diameter of the top fixing member (230) matches the inner diameter of the sleeve (210); The top fixing member (230) is installed in the sleeve (210) and abuts against the top end of the sleeve (210); The top end of the rotating shaft (191) protrudes outward from the magnetic component (195) and is rotatably inserted into the limiting hole (231).

10. The electronic expansion valve according to claim 9, characterized in that: The top fixing member (230) is provided with a through hole (233) on its periphery; A downwardly convex limiting ring platform (235) is provided on the periphery of the limiting hole (231); The limiting ring platform (235) abuts against the top surface of the magnetic component (195).

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