CN218992521U

CN218992521U - Electronic expansion valve

Info

Publication number: CN218992521U
Application number: CN202223124895.9U
Authority: CN
Inventors: 请求不公布姓名
Original assignee: Zhejiang Sanhua Automotive Components Co Ltd
Current assignee: Zhejiang Sanhua Automotive Components Co Ltd
Priority date: 2022-11-23
Filing date: 2022-11-23
Publication date: 2023-05-09
Anticipated expiration: 2032-11-23

Abstract

The electronic expansion valve comprises a rotor assembly and a Hall sensor, wherein the rotor assembly comprises a rotor component, the rotor component comprises a first rotor and a second rotor, at least part of the first rotor and at least part of the second rotor are axially distributed along the rotor assembly, the first rotor and the second rotor are directly or indirectly fixedly connected, the Hall sensor is located on the radial inner side or the radial outer side of the first rotor, the Hall sensor can sense the magnetic pole change of the first rotor, and the surface magnetism of a material of the first rotor is larger than that of a material of the second rotor. This is advantageous in reducing the cost of the rotor components while meeting the detection requirements.

Description

Electronic expansion valve

Technical Field

The application relates to the technical field of fluid control, in particular to an electronic expansion valve.

Background

The electronic expansion valve comprises a rotor component and a Hall sensor, wherein the Hall sensor can be used for detecting magnetic pole changes of the rotor component, the rotor component is integrally injection molded, and the magnetic field strength generated by materials used for the rotor component is required to meet the detection precision requirement of the Hall sensor, so that the rotor component is required to be manufactured by materials with stronger surface magnetism, and the setting is not beneficial to reducing the cost of the rotor component.

Disclosure of Invention

An object of the present application is to provide an electronic expansion valve, be favorable to reducing the cost of rotor part, can satisfy the detection demand simultaneously.

In order to achieve the above object, an embodiment of the present application adopts the following technical scheme:

the utility model provides an electronic expansion valve, includes rotor subassembly, hall sensor, rotor subassembly includes rotor part includes first rotor and second rotor, at least part first rotor and at least part the second rotor is followed rotor subassembly's axial is arranged, first rotor with second rotor direct or indirect fixed connection, hall sensor is located the radial inboard or the outside of first rotor, hall sensor can the perception the magnetic pole change of first rotor, the surface magnetism of the material of first rotor is greater than the surface magnetism of the material of second rotor.

In the embodiment that this application provided, electronic expansion valve includes rotor subassembly, hall sensor, rotor subassembly includes rotor part, rotor part includes first rotor and second rotor, first rotor and second rotor are direct or indirect fixed connection, hall sensor is located the radial inboard or the outside of first rotor, hall sensor can the magnetic pole change of perception first rotor, the table magnetism of the material of first rotor is greater than the table magnetism of the material of second rotor, the material price that table magnetism is stronger is higher relatively, the first rotor of material preparation that table magnetism is stronger, in order to satisfy hall sensor detection accuracy requirement, the second rotor can adopt the material that table magnetism is lower, be favorable to reducing rotor part's cost like this, can satisfy the detection demand simultaneously.

Drawings

FIG. 1 is a schematic cross-sectional view of a first embodiment of an electronic expansion valve provided herein;

FIG. 2 is a schematic cross-sectional structural view of the valve member of FIG. 1 from one perspective;

FIG. 3 is a schematic elevational view of the rotor assembly of FIG. 1;

FIG. 4 is a schematic cross-sectional view of the rotor assembly of FIG. 1 taken along the A-A plane;

FIG. 5 is a schematic cross-sectional structural view of one view of a valve member in a second embodiment of an electronic expansion valve provided herein;

FIG. 6 is a schematic cross-sectional structural view of one view of the rotor assembly of FIG. 5;

FIG. 7 is a schematic cross-sectional structural view of a rotor assembly in another embodiment;

FIG. 8 is a schematic cross-sectional view of a third embodiment of an electronic expansion valve according to the present application from one perspective;

fig. 9 is a schematic cross-sectional structural view of a perspective of a rotor assembly in a fourth embodiment of an electronic expansion valve provided herein.

Fig. 10 is a schematic cross-sectional view of a rotor assembly in a fifth embodiment of an electronic expansion valve according to the present application.

Detailed Description

The present application is further described with reference to the accompanying drawings and specific examples:

referring to fig. 1-4, a first embodiment of an electronic expansion valve is illustrated, where the electronic expansion valve includes a valve body 1, a coil assembly 2, and a valve member 4, and a portion of the valve member 4 is disposed in the valve body 1, and the valve member 4 is fixedly connected to the valve body 1, where the connection manner includes a threaded connection, and where the coil assembly 2 is fixedly connected to the valve body 1, and where the connection manner includes a screw connection. The coil assembly 2 comprises a stator assembly 21 and an injection molded body 22, the injection molded body 22 surrounding at least part of the stator assembly 21, the coil assembly 2 having a receiving cavity 221, the receiving cavity 221 having an opening in the injection molded body 22 towards the valve body 1. The valve member 4 includes a valve seat member 41, a rotor assembly 3, a spool member 42, a nut assembly 43, and a sleeve 44, and the lower end portion of the sleeve 44 is connected to the valve seat member 41 by welding. At least part of the sleeve 44 is located in the receiving cavity 221, part of the sleeve 44 is located between the rotor assembly 3 and the stator assembly 21, the rotor assembly 3 is located inside the sleeve 44, and the stator assembly 21 is located outside the sleeve 44. In the present embodiment, the valve seat member 41 includes a first valve seat portion 411 and a second valve seat portion 412, and in the present embodiment, the first valve seat portion 411 and the second valve seat portion 412 are formed separately and fixedly connected, and in other embodiments, the first valve seat portion 411 and the second valve seat portion 412 may be formed integrally. In this embodiment, the valve core member 42 is connected to the rotor assembly 3, the valve core member 42 includes a valve core 421 and a screw portion 5, the valve core 421 is connected to the screw portion 5, and the connection manner includes a fixed connection, a limit connection, or a transmission connection, however, in other embodiments, the valve core 421 and the screw portion 5 may be integrally formed. The stator assembly 21 is supplied with a predetermined current to generate an excitation magnetic field, the rotor assembly 3 can rotate in the excitation magnetic field, the rotor assembly 3 drives the screw rod part 5 to rotate, the screw rod part 5 is in threaded fit with the nut assembly 43, the rotor assembly 3 drives the valve core 421 to act relative to the valve seat part 41, in this embodiment, the second valve seat part 412 is provided with a valve port 4121, the screw rod part 5 drives the valve core 421 to axially move relative to the valve port 4121, and the flow area of the valve port 4121 is adjusted. For convenience of description, the upper and lower directions are defined as the upper and lower directions of the drawings in the specification drawings, and the upper and lower directions merely represent relative positions.

The electronic expansion valve comprises a Hall sensor 8, the rotor assembly 3 comprises a rotor component 6, the rotor component 6 comprises a first rotor 61 and a second rotor 62, at least part of the first rotor 61 and at least part of the second rotor 62 are arranged along the axial direction of the rotor assembly 3, the first rotor 61 and the second rotor 62 are directly or indirectly fixedly connected, the Hall sensor 8 is positioned on the radial inner side or the radial outer side of the first rotor 61, the Hall sensor 8 can sense the magnetic pole change of the first rotor 61, and the material surface magnetism of the first rotor 61 is larger than that of the second rotor 62. The price of the material with strong surface magnetism is relatively high, the material with strong surface magnetism is used for manufacturing the first rotor 61 so as to meet the detection precision requirement of the Hall sensor 8, and the material with low surface magnetism can be used for the second rotor 62, so that the cost of the rotor component 6 is reduced, and meanwhile, the detection requirement can be met.

Referring to fig. 3 to 4, the first rotor 61 and the second rotor 62 are directly fixedly connected. In this embodiment, the first rotor 61 and the second rotor 62 are integrally injection molded, so that the processing of the rotor member 6 can be facilitated, and the processing procedure of the rotor member 6 is simple. The rotor assembly 3 comprises a connecting body 31, the rotor part 6 and the connecting body 31 being injection-moulded. In this embodiment, the rotor member 6 is formed by insert molding with the connection body 31 as an insert, and the second rotor 62 covers the outer peripheral portion of the connection body 31, so that the processing process of the rotor assembly 3 is simple. In other examples, the first rotor 61 may cover the outer peripheral portion of the connecting body 31, or a portion between the first rotor 61 and the second rotor 62 may cover the outer peripheral portion of the connecting body 31. In other embodiments, the first rotor 61 and the second rotor 62 may be injection molded separately, and the first rotor 61 and the second rotor 62 may be fixed by injection molding. In other embodiments, the first rotor 61 and the second rotor 62 may be injection molded separately, and then bonded, and the lower end surface of the first rotor 61 is bonded to the upper end surface of the second rotor 62. In this embodiment, the first rotor 61 is located above the second rotor 62, the first rotor 61 and the second rotor 62 are arranged along the axial direction of the rotor assembly 3, the first rotor 61 and the second rotor 62 are hollow and cylindrical, the outer diameter of the first rotor 61 is the same as the outer diameter of the second rotor 62, the central axes of the first rotor 61 and the second rotor 62 are in the same line, and the rotor member 6 is also hollow and cylindrical after the first rotor 61 and the second rotor 62 are connected. The outer walls of the first rotor 61 and the second rotor 62 are flush and the rotor assembly 3 is located inside the sleeve 44, which allows the rotor member 6 as a whole to be brought closer to the sleeve 44, reducing the air gap. The length of the first rotor 61 is smaller than the length of the second rotor 62, the material used for the second rotor 62 is larger than the material used for the first rotor 61, and the surface magnetism of the material of the first rotor 61 is larger than the surface magnetism of the material of the second rotor 62. In this embodiment, the material of the first rotor 61 is neodymium iron boron, and the material of the second rotor 62 is ferrite, so that the cost of the rotor component 6 is reduced, and the magnetic field detection strength required by the hall sensor 8 is satisfied. In other embodiments, the material of the first rotor 61 may also be samarium cobalt or rare earth cobalt, and the material of the second rotor 62 may also be iron chromium cobalt or alnico or iron chromium cobalt. The cost of the material of the first rotor 61 is higher than that of the material of the second rotor 62, the length of the first rotor 61 is smaller than that of the second rotor 62, and the magnetic field detection strength required by the detection of the hall sensor 8 is satisfied by using less high-cost material, so that the production cost of the rotor component 6 is reduced.

Referring to fig. 1, the electronic expansion valve includes an electronic control board 7, and a hall sensor 8 is electrically and/or signally connected to the electronic control board 7. In this embodiment, the hall sensor 8 is located at the radial outer side of the first rotor 61, at least part of the hall sensor 8 is located between two axial ends of the first rotor 61, the hall sensor 8 can sense the magnetic pole change of the first rotor 61, the surface magnetic field of the first rotor 61 is larger than that of the second rotor 62, so that the hall sensor 8 can sense the magnetic pole change of the first rotor 61 more sensitively, and thus the rotation angle of the rotor component 6 is detected, and the electronic control board 7 or the upper computer determines the position or the movement state of the rotor component 6 according to the rotation angle, and further determines whether the valve is closed or whether the fault such as blocking occurs. In other embodiments, the hall sensor 8 may also be located radially inward of the first rotor 61. The surface magnetism of the first rotor 61 is larger than that of the second rotor 62, the magnetic performance of the material of the first rotor 61 meets the detection side requirement of the Hall sensor 8, the magnetic performance of the material of the second rotor 62 meets the driving requirement, less high-cost materials are used, and the production cost of the electronic expansion valve is reduced.

Referring to fig. 1-2, the rotor assembly 3 includes a transition sleeve 32, at least a portion of the transition sleeve 32 is located between the connector 31 and the lead screw portion 5, and in this embodiment, the connector 31 is welded to the transition sleeve 32, and the transition sleeve 32 is interference fit with the lead screw portion 5. In other embodiments, the inner side wall of the transition sleeve 32 is provided with threads, the outer peripheral wall of the screw rod part 5 is provided with threads, and the transition sleeve 32 and the screw rod part 51 are in threaded connection or in threaded connection combination and adhesion. The screw rod part 5 is convenient to detach, and when the electronic expansion valve is recovered, the screw rod part 5 can be recovered and reused, so that the material saving is facilitated. In other embodiments, the rotor assembly 3 may not be provided with the transition sleeve 32, the upper ends of the connector 31 and the screw rod portion 5 are fixedly connected through welding or are connected through interference fit, the connector 31 and the screw rod portion 5 are directly connected, and the electronic expansion valve is simpler in structure.

Referring to fig. 5-6, a second embodiment of an electronic expansion valve is illustrated, in this embodiment, a first rotor 61 and a second rotor 62 are engaged. The first rotor 61 includes a first clamping portion 611 and a first body portion 616, the radial thickness of the first clamping portion 611 is smaller than the radial thickness of the first body portion 616, and the first clamping portion 611 protrudes downward from the lower end surface of the first body portion 616. The second rotor 62 includes a second engaging portion 621 and a second body portion 623, the radial thickness of the second engaging portion 621 being smaller than the radial thickness of the second body portion 623, the second engaging portion 621 being disposed protruding upward from the upper end surface of the second body portion 623. The inner diameter of the first clamping portion 611 is larger than the outer diameter of the second clamping portion 621, the first clamping portion 611 is sleeved on the outer periphery of the second clamping portion 621, the inner peripheral wall of the first clamping portion 611 is in interference fit with the outer peripheral wall of the second clamping portion 621, and the first rotor 61 and the second rotor 62 are clamped. In the present embodiment, the lower end surface of the first engaging portion 611 abuts against the upper end surface of the second rotor 62, and the upper end surface of the second engaging portion 621 abuts against the lower end surface of the first rotor 61. In this way, the connection between the first rotor 61 and the second rotor 62 is simple, and the connection between the first rotor 61 and the second rotor 62 is more stable. In other embodiments, the lower end surface of the first engaging portion 611 and the upper end surface of the second rotor 62 may not abut, and the upper end surface of the second engaging portion 621 and the lower end surface of the first rotor 61 may not abut. The outer diameter of the first rotor 61 is the same as the outer diameter of the second rotor 62, the outer walls of the first rotor 61 and the second rotor 62 are flush, and the rotor assembly 3 is located inside the sleeve 44, so that the rotor member 6 as a whole is brought closer to the sleeve 44, reducing the air gap. In this embodiment, the second rotor 62 is formed by insert molding with the connection body 31 as an insert, and the second rotor 62 covers the outer peripheral portion of the connection body 31, so that the processing procedure of the rotor assembly 3 is simple. In other examples, the first rotor 61 may cover the outer peripheral portion of the connecting body 31. Referring to fig. 7, in other embodiments, the second clamping portion 621 is sleeved on the outer periphery of the first clamping portion 611, and the inner peripheral wall of the second clamping portion 621 is in interference fit with the outer peripheral wall of the first clamping portion 611. In other embodiments, the first rotor 61 and the second rotor 62 may also be bonded.

Referring to fig. 8, a third embodiment of an electronic expansion valve is illustrated, in which the rotor member 6 includes a support portion 63, and the first rotor 61 and the second rotor 62 are respectively fixed to the support portion 63. In this embodiment, the support portion 63 is formed by insert molding the connection body 31, and the support portion 63 covers the outer peripheral portion of the connection body 31, so that the processing procedure of the rotor assembly 3 is simple. In other embodiments, the second rotor 62 may cover the outer peripheral portion of the connection body 31 or the first rotor 61 may cover the outer peripheral portion of the connection body 31. The support 63 is located between the first rotor 61 and the second rotor 62, the first rotor 61 is located above the support 63, and the second rotor 62 is located below the support 63. The support 63 includes a first protrusion 633, a second protrusion 634, and a body 636, the first protrusion 633 protruding upward from an upper end surface of the body 636, and the second protrusion 634 protruding downward from a lower end surface of the body 636. The first rotor 61 includes a first groove 612, the first groove 612 is recessed upward from the lower end surface of the first rotor 61, the outer peripheral wall of the first boss 633 is interference fit with the inner peripheral wall forming the first groove 612, and the first rotor 61 and the support 63 are engaged. The second rotor 62 includes a second groove 622, the second groove 622 is recessed downward from an upper end surface of the second rotor 62, an outer peripheral wall of the second boss 634 is interference fit with an inner peripheral wall forming the second groove 622, and the second rotor 62 is engaged with the supporting portion 63. The first rotor 61 includes a first portion 613, a second portion 614, and a third portion 615, in this embodiment, a lower end surface of the first portion 613 axially abuts against an upper end surface of the supporting portion 63, a lower end surface of the second portion 614 axially abuts against an upper end surface of the supporting portion 63, and a lower end surface of the third portion 615 axially abuts against an upper end surface of the first protrusion 633, so that the first rotor 61 and the supporting portion 63 are connected simply and the connection is more stable. The cooperation of the second rotor 62 and the second boss 634 is the cooperation of the first rotor 61 and the first boss 633, and will not be described in detail. In other embodiments, the lower end surface of the first portion 613 and the upper end surface of the supporting portion 63 may not abut, the lower end surface of the second portion 614 and the upper end surface of the supporting portion 63 may not abut, and the lower end surface of the third portion 615 and the upper end surface of the first protrusion 633 may not abut. The outer diameter of the first rotor 61 is the same as the outer diameter of the second rotor 62, the outer walls of the first rotor 61 and the second rotor 62 are flush, and the rotor assembly 3 is located inside the sleeve 44, so that the rotor member 6 as a whole is brought closer to the sleeve 44, reducing the air gap. In other embodiments, the first rotor 61 and the supporting portion 63 may be further clamped and bonded, and the second rotor 62 and the supporting portion 63 may be further clamped and bonded.

Referring to fig. 9, there is illustrated a fourth embodiment of an electronic expansion valve, in which a first rotor 61 is injection-molded with a support 63, and a second rotor 62 is injection-molded with the support 63. In this embodiment, the first rotor 61, the second rotor 62, and the connecting body 31 are formed by insert molding to form the supporting portion 63, and the supporting portion 63 covers the outer peripheral portion of the connecting body 31, so that the processing procedure of the rotor assembly 3 is simple. The support 63 covers at least part of the upper end surface of the first rotor 61, the support 63 covers at least part of the lower end surface of the first rotor 61, the support 63 covers at least part of the upper end surface of the second rotor 62, and the support 63 covers at least part of the lower end surface of the second rotor 62. In this embodiment, the supporting portion 63 covers the upper end face and the lower end face of the first rotor 61, the supporting portion 63 covers the upper end face and the lower end face of the second rotor 62, and the supporting portion 63 separates the first rotor 61 from the second rotor 62, so that the first rotor 61 and the second rotor 62 are connected with the supporting portion 63 simply and stably. The outer diameters of the first rotor 61 and the second rotor 62 are the same, the outer walls of the first rotor 61, the second rotor 62 and the supporting portion 63 are flush, and the rotor assembly 3 is positioned on the inner side of the sleeve 44, so that the rotor member 6 is closer to the sleeve 44 as a whole, and an air gap is reduced. In other embodiments, the support 63 covers at least a portion of the upper end surface of the first rotor 61, the support covers at least a portion of the lower end surface of the second rotor 62, and the support 63 does not separate the first rotor 61 from the second rotor 62.

Referring to fig. 10, a fifth embodiment of an electronic expansion valve is illustrated, in this embodiment, a first rotor 61 is engaged with a supporting portion 63, and a second rotor 62 is engaged with the supporting portion 63. In the present embodiment, the support portion 63 is formed by insert molding with the connection body 31 as an insert, and the support portion 63 covers the outer peripheral portion of the connection body 31. The support 63 includes a first slot 631 and a second slot 632, the first slot 631 being located above the second slot 632. The support portion 63 includes a flange portion 635, the flange portion 635 separating the first groove 631 and the second groove 632, the flange portion 635 serving to restrict the axial position of the first rotor 61, the second rotor 62 in the support portion 63. The first groove 631 is recessed from the outer peripheral wall of the support portion 63 toward the central axis direction of the support portion 63, the first groove 631 circumferentially surrounds one circumference of the support portion 63, and the first groove 631 has openings toward the outside and the upper side. The second groove 632 is recessed from the outer peripheral wall of the support portion 63 toward the central axis direction of the support portion 63, the second groove 632 circumferentially surrounds one circumference of the support portion 63, and the second groove 632 has openings toward the outside and the lower side. The inner diameter of the first rotor 61 is larger than the outer diameter of the first groove 631, the first rotor 61 is sleeved on the outer periphery of the first groove 631, the inner peripheral wall of the first rotor 61 is in interference fit with the outer peripheral wall forming the first groove 631, and the first rotor 61 is clamped with the supporting portion 63. The inner diameter of the second rotor 62 is larger than the outer diameter of the second groove 632, the second rotor 62 is sleeved on the outer periphery of the second groove 632, the inner peripheral wall of the second rotor 62 is in interference fit with the outer peripheral wall forming the second groove 632, and the second rotor 62 is clamped with the supporting portion 63. The first rotor 61, the second rotor 62 and the supporting portion 63 are thus simply connected. The outer diameter of the first rotor 61, the outer diameter of the second rotor 62 and the outer diameter of the supporting part 63 are the same, the central axes of the outer diameters of the first rotor 61, the second rotor 62 and the supporting part 63 are in the same straight line, the outer walls of the first rotor 61, the second rotor 62 and the supporting part 63 are flush, and the rotor assembly 3 is positioned on the inner side of the sleeve 44, so that the whole rotor component 6 is closer to the sleeve 44, and the air gap is reduced. In other embodiments, the first rotor 61 and the supporting portion 63 may be bonded, and the second rotor 62 and the supporting portion 63 may be bonded; alternatively, the first rotor 61 and the support 63 may be engaged with each other and bonded to each other, and the second rotor 62 and the support 63 may be engaged with each other and bonded to each other. In other embodiments, the support 63, the first rotor 61, and the second rotor 62 may be injection molded with the connection plate 31 as an insert.

It should be noted that: the above embodiments are only for illustrating the present utility model and not for limiting the technical solutions described in the present utility model, and although the present utility model has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the present utility model may be modified or substituted by the same, and all the technical solutions and modifications thereof without departing from the spirit and scope of the present utility model are intended to be included in the scope of the claims of the present utility model.

Claims

1. An electronic expansion valve comprises a rotor assembly (3) and a Hall sensor (8), and is characterized in that the rotor assembly (3) comprises a rotor component (6), the rotor component (6) comprises a first rotor (61) and a second rotor (62), at least part of the first rotor (61) and at least part of the second rotor (62) are arranged along the axial direction of the rotor assembly (3), the first rotor (61) and the second rotor (62) are directly or indirectly fixedly connected, the Hall sensor (8) is positioned on the inner side or the outer side of the first rotor (61) in the radial direction, the Hall sensor (8) can sense the magnetic pole change of the first rotor (61), and the surface magnetism of the material of the first rotor (61) is larger than that of the material of the second rotor (62).

2. The electronic expansion valve according to claim 1, characterized in that said first rotor (61) is located above said second rotor (62), at least part of said hall sensor (8) being located between the axial ends of said first rotor (61);

-said first rotor (61) and said second rotor (62) are integrally injection-moulded; or the first rotor (61) and the second rotor (62) are respectively injection molded, and the first rotor (61) and the second rotor (62) are directly or indirectly fixedly connected.

3. The electronic expansion valve according to claim 1 or 2, wherein the first rotor (61) and the second rotor (62) are injection molded, respectively, the first rotor (61) comprises a first clamping portion (611) and a first body portion (616), a radial thickness of the first clamping portion (611) is smaller than a radial thickness of the first body portion (616), the first clamping portion (611) protrudes downward from a lower end surface of the first body portion (616), the second rotor (62) comprises a second clamping portion (621) and a second body portion (623), a radial thickness of the second clamping portion (621) is smaller than a radial thickness of the second body portion (623), and the second clamping portion (621) protrudes upward from an upper end surface of the second body portion (623); the first clamping part (611) is sleeved on the outer periphery of the second clamping part (621), the inner peripheral wall of the first clamping part (611) is in interference fit with the outer peripheral wall of the second clamping part (621), and the first rotor (61) and the second rotor (62) are clamped;

or, the second clamping part (621) is sleeved on the outer periphery of the first clamping part (611), and the inner peripheral wall of the second clamping part (621) is in interference fit with the outer peripheral wall of the first clamping part (611);

or the first rotor (61) and the second rotor (62) are bonded.

4. The electronic expansion valve (100) according to claim 1 or 2, wherein the rotor assembly (3) comprises a connecting body (31), the rotor member (6) comprises a supporting portion (63), the supporting portion (63) is injection-molded and fixed with the connecting body (31), the supporting portion (63) covers an outer peripheral portion of the connecting body (31), at least a part of the supporting portion (63) is located between the first rotor (61) and the second rotor (62), and the first rotor (61) and the second rotor (62) are fixed with the supporting portion (63), respectively.

5. The electronic expansion valve according to claim 4, wherein the support portion (63) is located between the first rotor (61) and the second rotor (62), the first rotor (61) is located above the support portion (63), the second rotor (62) is located below the support portion (63), the support portion (63) includes a first protrusion portion (633), a second protrusion portion (634), and a body portion (636), the first protrusion portion (633) protrudes upward from an upper end surface of the body portion (636), and the second protrusion portion (634) protrudes downward from a lower end surface of the body portion (636);

the first rotor (61) comprises a first groove (612), the first groove (612) is recessed upwards from the lower end face of the first rotor (61), the outer peripheral wall of the first protruding part (633) is in interference fit with the inner peripheral wall forming the first groove (612), the first rotor (61) is clamped with the supporting part (63), the second rotor (62) comprises a second groove (622), the second groove (622) is recessed downwards from the upper end face of the second rotor (62), the outer peripheral wall of the second protruding part (634) is in interference fit with the inner peripheral wall forming the second groove (622), and the second rotor (62) is clamped with the supporting part (63); or the first rotor (61) and the supporting part (63) are clamped and combined and bonded, and the second rotor (62) and the supporting part (63) are clamped and combined and bonded.

6. The electronic expansion valve according to claim 4, wherein the support portion (63) covers at least part of an upper end face of the first rotor (61), the support portion (63) covers at least part of a lower end face of the first rotor (61), the support portion (63) covers at least part of an upper end face of the second rotor (62), and the support portion (63) covers at least part of a lower end face of the second rotor (62).

7. The electronic expansion valve according to claim 4, wherein the support portion (63) includes a first groove (631) and a second groove (632), the first groove (631) being located above the second groove (632), the support portion (63) including a flange portion (635), the flange portion (635) separating the first groove (631) and the second groove (632), the first groove (631) being recessed from an outer side Zhou Bichao of the support portion (63) toward a central axis direction of the support portion (63), the first groove (631) having an opening toward an outer side and an upper side, the second groove (632) being recessed from an outer side Zhou Bichao of the support portion (63) toward the central axis direction of the support portion (63), the second groove (632) having an opening toward an outer side and a lower side;

the first rotor (61) is sleeved on the periphery of the first groove (631), the inner peripheral wall of the first rotor (61) is in interference fit with the outer peripheral wall forming the first groove (631), the first rotor (61) is clamped with the supporting part (63), the second rotor (62) is sleeved on the periphery of the second groove (632), the inner peripheral wall of the second rotor (62) is in interference fit with the outer peripheral wall forming the second groove (632), and the second rotor (62) is clamped with the supporting part (63);

or the first rotor (61) and the support part (63) are bonded, and the second rotor (62) and the support part (63) are bonded;

or the first rotor (61) and the supporting part (63) are clamped and combined and bonded, and the second rotor (62) and the supporting part (63) are clamped and combined and bonded.

8. An electronic expansion valve according to claim 3, characterized in that the material of the first rotor (61) comprises neodymium-iron-boron or samarium-cobalt or rare earth cobalt, the material of the second rotor (62) comprises ferrite or iron-chromium-cobalt or alnico, and the material of the second rotor (62) is larger than the material of the first rotor (61).

9. The electronic expansion valve according to claim 4, characterized in that the material of the first rotor (61) comprises neodymium-iron-boron or samarium-cobalt or rare earth cobalt, the material of the second rotor (62) comprises ferrite or iron-chromium-cobalt or alnico, and the material of the second rotor (62) is larger than the material of the first rotor (61).

10. The electronic expansion valve according to any of the claims 5-7, characterized in that the material of the first rotor (61) comprises neodymium-iron-boron or samarium-cobalt or rare earth cobalt, the material of the second rotor (62) comprises ferrite or iron-chromium-cobalt or alnico, and the material of the second rotor (62) is larger than the material of the first rotor (61).

11. The electronic expansion valve according to claim 8, wherein the length of the first rotor (61) is smaller than the length of the second rotor (62), the central axes of the first rotor (61) and the second rotor (62) are in the same straight line, and the outer walls of the first rotor (61) and the second rotor (62) are arranged in a flush manner.

12. The electronic expansion valve according to claim 9, wherein the length of the first rotor (61) is smaller than the length of the second rotor (62), the central axes of the first rotor (61) and the second rotor (62) are in the same straight line, and the outer walls of the first rotor (61) and the second rotor (62) are arranged in a flush manner.

13. The electronic expansion valve according to claim 10, wherein the length of the first rotor (61) is smaller than the length of the second rotor (62), the central axes of the first rotor (61) and the second rotor (62) are in the same straight line, and the outer walls of the first rotor (61) and the second rotor (62) are arranged in a flush manner.

14. The electronic expansion valve according to claim 11 or 12 or 13, characterized in that the electronic expansion valve comprises a screw rod part (5), a stator assembly (21) and a valve core part (421), wherein the valve core part (421) is connected with the screw rod part (5), the stator assembly (21) is used for generating an excitation magnetic field, the rotor assembly (3) comprises a transition sleeve (32), at least part of the transition sleeve (32) is positioned between a connecting body (31) of the rotor assembly (3) and the screw rod part (5), the connecting body (31) of the rotor assembly (3) is fixedly connected with the transition sleeve (32), and the transition sleeve (32) is connected with the screw rod part (5) in an interference fit or a threaded connection in a combined bonding manner.