Electronic expansion valve

Abstract

The electronic expansion valve comprises a stop seat, a rotor assembly, a screw rod, a valve element assembly and a valve seat assembly, the stop seat is fixedly connected to the valve seat assembly and arranged on the periphery of the screw rod, the valve seat assembly is provided with a valve port part, and the valve element assembly can move in the axial direction of the screw rod relative to the valve seat assembly; one end of the lead screw is fixedly connected to the rotor assembly, the other end of the lead screw is connected with the valve element assembly, and the rotor assembly can drive the valve element assembly to move in the direction close to or away from the valve port part through the lead screw. The end, away from the valve port part, of the stop seat is fixedly provided with a first matching part in movable guide fit with the lead screw. According to the electronic expansion valve, the problem that the lead screw is prone to eccentricity is solved.

Description

Technical Field

[0001] The present application relates to the field of valve body technology, and in particular to an electronic expansion valve. Background Art

[0002] As a new type of control element, the electronic expansion valve has already broken through the concept of throttling mechanism. It is an important part of the intelligentization of the refrigeration system, an important means and guarantee for the real realization of the optimization of the refrigeration system, and a symbol of the mechatronics of the refrigeration system. It has been applied in more and more fields.

[0003] During the operation of the electronic expansion valve, the screw rod needs to rotate continuously with the rotor. Over time, the screw rod is prone to eccentricity. Utility Model Content

[0004] Based on this, it is necessary to provide an electronic expansion valve to solve the problem that the screw rod is prone to eccentricity.

[0005] The electronic expansion valve provided by the present application includes a stop seat, a rotor assembly, a screw rod, a valve core assembly and a valve seat assembly, wherein the stop seat is fixedly connected to the valve seat assembly and is arranged on the outer periphery of the screw rod, the valve seat assembly is provided with a valve mouth portion, the valve core assembly can move relative to the valve seat assembly along the axial direction of the screw rod, one end of the screw rod is fixedly connected to the rotor assembly, and the other end is connected to the valve core assembly, and the rotor assembly can drive the valve core assembly to move toward or away from the valve mouth portion through the screw rod. The end of the stop seat away from the valve mouth portion is fixedly provided with a first matching portion that matches with the movable guide of the screw rod.

[0006] In one embodiment, the first matching portion and the stop seat are integrally injection molded.

[0007] In one of the embodiments, a second matching portion that matches with the movable limit of the screw rod is fixedly provided at one end of the stop seat close to the valve mouth, and the second matching portion and the stop seat are separately formed.

[0008] In one embodiment, the electronic expansion valve also includes a first limit member, a second limit member and a first elastic member, one of the first limit member and the second limit member is fixedly connected to the stop seat, and the other is fixedly connected to the screw rod, one end of the first elastic member is connected to the first limit member, and the other end is connected to the second limit member, when the screw rod moves in the direction from the valve mouth to the rotor assembly, the first elastic member can generate an elastic pre-tightening force on the screw rod from the rotor assembly to the valve mouth.

[0009] In one embodiment, the first limiter is fixedly connected to the inner wall of the stop seat, the second limiter is fixedly connected to the outer wall of the screw rod, and the first limiter is arranged at one end of the first elastic member away from the valve mouth, and the second limiter is arranged at one end of the first elastic member close to the valve mouth. The second matching portion stops at one end of the first limiter close to the valve mouth to prevent the first limiter from moving toward the valve mouth, and one end of the first elastic member abuts against the first matching portion, and the other end abuts against the first limiter.

[0010] In one embodiment, the first limiter is fixedly connected to the outer wall of the screw rod, the second limiter is fixedly connected to the inner wall of the stop seat, and the first limiter is arranged at one end of the first elastic member close to the valve mouth, and the second limiter is arranged at one end of the first elastic member away from the valve mouth. The second matching portion stops at one end of the first limiter close to the valve mouth to prevent the first limiter from moving toward the valve mouth, and one end of the first elastic member abuts against the first matching portion, and the other end abuts against the first limiter.

[0011] In one embodiment, the valve core assembly includes a sliding nut and a valve needle assembly, and one end of the screw rod away from the rotor assembly is threadedly engaged with the sliding nut, and the sliding nut and the second mating part are engaged with each other through a limiting structure, so that the screw rod can drive the sliding nut to drive the valve core assembly to move axially relative to the stop seat along the screw rod.

[0012] In one embodiment, the limiting structure is a first magnetic component and a second magnetic component. The first magnetic component is fixedly provided on the circumferential side of the sliding nut, and the second matching portion is fixedly provided with a second magnetic component extending along its own axial direction corresponding to the first magnetic component. The corresponding positions of the first magnetic component and the second magnetic component can attract each other or repel each other to prevent the sliding nut from rotating around the axis of the screw relative to the stop seat.

[0013] In one of the embodiments, a first stop portion is provided on a side of the stop seat away from the valve opening, and the first stop portion constitutes a second limiting member.

[0014] In one embodiment, the electronic expansion valve further comprises a shell, which is disposed on the outside of the rotor assembly, a part of the lead screw and a part of the valve core assembly and is welded to the valve seat assembly.

[0015] Compared with the prior art, the first matching portion is provided to effectively prevent the screw rod from eccentrically moving relative to the stop seat, thereby improving the coaxiality of the screw rod and the stop seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A schematic diagram of a partial structure of an electronic expansion valve according to an embodiment of the present application;

[0018] Figure 2 A cross-sectional view of an electronic expansion valve according to an embodiment of the present application;

[0019] Figure 3 A cross-sectional view of an electronic expansion valve according to another embodiment of the present application;

[0020] Figure 4 A cross-sectional view of an electronic expansion valve according to another embodiment of the present application;

[0021] Figure 5 A schematic diagram of a partial structure of an electronic expansion valve according to an embodiment of the present application;

[0022] Figure 6 A cross-sectional view of an electronic expansion valve according to another embodiment of the present application;

[0023] Figure 7 A schematic diagram of the partial structure of an electronic expansion valve according to another embodiment of the present application.

[0024] : Figure numerals: 100, rotor assembly; 200, screw rod; 220, first limit member; 230, second limit member; 300, valve core assembly; 310, sliding nut; 312, first magnetic assembly; 320, valve needle assembly; 400, valve seat assembly; 410, valve mouth; 510, stop seat; 511, external threaded portion; 5101, first matching portion; 5102, second matching portion; 516, second magnetic assembly; 520, stop ring; 530, guide rod; 540, first stop portion; 541, annular fixing ring; 542, stop ridge; 610, first elastic member; 800, shell. DETAILED DESCRIPTION

[0025] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0027] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0029] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0031] See also Figure 1-Figure 7 In one embodiment, the electronic expansion valve includes a stop seat 510, a rotor assembly 100, a screw rod 200, a valve core assembly 300 and a valve seat assembly 400. The stop seat 510 is fixedly connected to the valve seat assembly 400, and the stop seat 510 is arranged on the outer periphery of the screw rod 200. The valve seat assembly 400 is provided with a valve mouth portion 410. The valve core assembly 300 can move axially relative to the valve seat assembly 400 along the screw rod 200. One end of the screw rod 200 is fixedly connected to the rotor assembly 100, and the other end is connected to the valve core assembly 300. The rotor assembly 100 can drive the valve core assembly 300 to move toward or away from the valve mouth portion 410 through the screw rod 200.

[0032] The electronic expansion valve also includes a first limit member 220, a second limit member 230 and a first elastic member 610. One of the first limit member 220 and the second limit member 230 is fixedly connected to the stop seat 510, and the other is fixedly connected to the screw rod 200. One end of the first elastic member 610 is connected to the first limit member 220, and the other end is connected to the second limit member 230. When the screw rod 200 moves in the direction from the valve mouth portion 410 to the rotor assembly 100, the first elastic member 610 can generate an elastic pre-tightening force on the screw rod 200 from the rotor assembly 100 to the valve mouth portion 410.

[0033] Specifically, the electronic expansion valve further includes a stop ring 520 and a guide rod 530. The outer peripheral side of the stop seat 510 away from the screw rod 200 is provided with an external threaded portion 511. The stop ring 520 is sleeved on the outer periphery of the stop seat 510 and is movably threaded with the external threaded portion 511. The guide rod 530 is fixedly connected to the rotor assembly 100 or the screw rod 200, so that the rotor assembly 100 can drive the guide rod 530 to push the stop ring 520 to move along the external threaded portion 511. In addition, the screw rod 200 and the valve core assembly 300 are movably threaded.

[0034] When the screw rod 200 works normally, the stop seat 510 supports the screw rod 200 and the rotor assembly 100, and the screw rod 200 rotates in place with the rotor assembly 100, and the screw rod 200 does not move along the axial direction. When the screw rod 200 drives the valve core assembly 300 to close the valve mouth 410, the rotor assembly 100 continues to rotate, and the screw rod 200 continues to rotate relative to the valve core assembly 300. However, since the valve core assembly 300 has abutted against the valve mouth 410, the valve core assembly 300 cannot continue to move toward the valve mouth 410. At this time, under the push of the reaction force, the screw rod 200 moves in the direction away from the valve mouth 410, and due to the limiting effect of the first limit member 220 and the second limit member 230, a first elastic member 610 is clamped between the screw rod 200 and the stop seat 510, and the first elastic member 610 is a compression elastic member. Therefore, the first elastic member 610 will continue to be compressed during the process of the lead screw 200 moving away from the valve mouth portion 410. At this time, the first elastic member 610 will in turn apply a force to the lead screw 200 toward the valve mouth portion 410, thereby increasing the squeezing pressure of the valve core assembly 300 on the valve mouth portion 410, achieving a pre-tightening effect on the valve mouth portion 410, and preventing loosening and leakage between the valve core assembly 300 and the valve mouth portion 410.

[0035] It should be noted that the electronic expansion valve further includes a housing 800 , which covers the outer sides of the rotor assembly 100 , a portion of the lead screw 200 and a portion of the valve core assembly 300 and is welded to the valve seat assembly 400 .

[0036] In one embodiment, the first elastic member 610 is a compression spring, and the first elastic member 610 is sleeved on the outer side of the screw rod 200 .

[0037] In this way, the processing difficulty of the first elastic member 610 is significantly reduced, and the assembly difficulty of the first elastic member 610 and the screw rod 200 is reduced.

[0038] Embodiment 1

[0039] In this embodiment, the first limit member 220 is fixedly connected to the inner wall of the stop seat 510, the second limit member 230 is fixedly connected to the outer wall of the screw rod 200, and the first limit member 220 is arranged at one end of the first elastic member 610 away from the valve mouth portion 410, and the second limit member 230 is arranged at one end of the first elastic member 610 close to the valve mouth portion 410.

[0040] In this embodiment, the first limit member 220 is a bearing member, and the outer ring of the bearing of the first limit member 220 is fixedly connected to the inner wall of the stop seat 510, and the inner ring of the bearing of the first limit member 220 is movably sleeved on the outer wall of the screw rod 200, so that the screw rod 200 can drive the inner ring of the bearing of the first limit member 220 to rotate synchronously, and the screw rod 200 can move along its own axial direction relative to the inner ring of the bearing of the first limit member 220.

[0041] It can be understood that the bearing member is a special type of shaft-type connecting member. When the first stopper 220 is a bearing member, the screw rod 200 can drive the inner ring of the bearing of the first stopper 220 to rotate synchronously. In this way, the stopper 510 can provide a limiting effect on the screw rod 200 through the first bearing member to ensure the coaxiality of the screw rod 200 and the stopper 510 and avoid eccentricity of the screw rod 200. In addition, by setting the first stopper 220 as a bearing member, sliding friction between the screw rod 200 and the stopper 510 is effectively prevented.

[0042] Further, in this embodiment, the bearing inner ring of the first stopper 220 is not completely fixed to the outer wall of the screw rod 200. Specifically, the screw rod 200 can move along its own axial direction relative to the bearing inner ring of the first stopper 220. That is, there is a certain friction between the screw rod 200 and the bearing inner ring of the first stopper 220. The friction can drive the bearing inner ring of the first stopper 220 to rotate synchronously. However, when the screw rod 200 needs to overcome the elastic force of the first elastic member 610 to move axially, the first stopper 220 will not limit the movement of the screw rod 200. Specifically, when the valve core assembly 300 blocks the valve port 410, the valve core assembly 300 will not continue to move if the screw rod 200 continues to rotate. At this time, the screw rod 200 can compress the first elastic member 610 in a direction away from the valve port 410, so that the first elastic member 610 applies a pre-tightening force to the connection between the valve core assembly 300 and the valve port 410.

[0043] Furthermore, in this embodiment, one end of the first elastic member 610 away from the valve opening portion 410 abuts against the inner ring of the bearing of the first limiting member 220 .

[0044] In this way, the first elastic member 610, the inner ring of the bearing of the first limit member 220, the screw rod 200 and the rotor assembly 100 can rotate synchronously, and no sliding friction occurs between the first elastic member 610 and the inner ring of the bearing of the first limit member 220, thereby reducing the wear between the screw rod 200, the first elastic member 610 and the first limit member 220, and improving the service life of the electronic expansion valve.

[0045] In this embodiment, the outer ring of the bearing of the first limiting member 220 is embedded in the inner wall of the stop seat 510. Specifically, the outer ring of the bearing of the first limiting member 220 is embedded in the stop seat 510 by integral injection molding.

[0046] Alternatively, in other embodiments, the first limiting member 220 is a metal member, and the bearing outer ring of the first limiting member 220 and the stop seat 510 can be welded, bonded or threadedly connected.

[0047] Embodiment 2

[0048] In this embodiment, the first limit member 220 is fixedly connected to the outer wall of the screw rod 200, the second limit member 230 is fixedly connected to the inner wall of the stop seat 510, and the first limit member 220 is arranged at one end of the first elastic member 610 close to the valve mouth portion 410, and the second limit member 230 is arranged at one end of the first elastic member 610 away from the valve mouth portion 410.

[0049] In this embodiment, a first stopper 540 is provided on one side of the stopper seat 510 away from the valve opening 410 , and when the stop ring 520 stops at the first stopper 540 , the valve core assembly 300 and the valve opening 410 are spaced apart and stop moving. In addition, the first stopper 540 constitutes the second stopper 230 .

[0050] In this way, the first stopper 540 can realize the functions of stopping the stop ring 520 and the first elastic member 610 at the same time, thereby simplifying the structure of the electronic expansion valve and improving the structural integration of the electronic expansion valve.

[0051] Specifically, in this embodiment, the first stop portion 540 includes an annular fixing ring 541 and a stop ridge 542. The inner side of the annular fixing ring 541 is arranged around the circumference of the screw rod 200, and the outer ring of the annular fixing ring 541 is fixedly connected to the inner wall of the stop seat 510. The stop seat 510 is provided with a notch corresponding to the stop ridge 542. One end of the stop ridge 542 is connected to the outer ring of the annular fixing ring 541, and the other end passes through the notch along the radial direction of the stop seat 510 and protrudes from the outer side surface of the stop seat 510.

[0052] In this embodiment, the first limit member 220 is a bearing member, and the inner ring of the bearing of the first limit member 220 is fixedly connected to the outer wall of the screw rod 200, and the outer ring of the bearing of the first limit member 220 is movably inserted into the inner wall of the stop seat 510, so that the screw rod 200 can drive the outer ring of the bearing of the first limit member 220 to move along its own axial direction relative to the stop seat 510, and the inner wall of the stop seat 510 can limit the rotation of the outer ring of the bearing of the first limit member 220.

[0053] It can be understood that the bearing member is a special type of shaft-type connecting member. When the first stopper 220 is a bearing member, the screw rod 200 can drive the inner ring of the bearing of the first stopper 220 to rotate synchronously. In this way, the stopper 510 can provide a limiting effect on the screw rod 200 through the first bearing member to ensure the coaxiality of the screw rod 200 and the stopper 510 and avoid eccentricity of the screw rod 200. In addition, by setting the first stopper 220 as a bearing member, sliding friction between the screw rod 200 and the stopper 510 is effectively prevented.

[0054] Further, in this embodiment, the outer ring of the bearing of the first stopper 220 is not completely fixed on the inner wall of the stopper 510. Specifically, the screw rod 200 can drive the outer ring of the bearing of the first stopper 220 to move along its own axial direction relative to the stopper 510. When the screw rod 200 needs to overcome the elastic force of the first elastic member 610 to move axially, the first stopper 220 will not restrict the movement of the screw rod 200. More specifically, when the valve core assembly 300 blocks the valve port 410, if the screw rod 200 continues to rotate, the valve core assembly 300 will not continue to move. At this time, the screw rod 200 can compress the first elastic member 610 in a direction away from the valve port 410, so that the first elastic member 610 applies a pre-tightening force to the connection between the valve core assembly 300 and the valve port 410.

[0055] Furthermore, in this embodiment, one end of the first elastic member 610 close to the valve opening 410 abuts against the outer ring of the bearing of the first limiting member 220 .

[0056] In this way, the first elastic member 610, the outer ring of the bearing of the first limit member 220 and the stop seat 510 will not rotate synchronously with the screw 200, and no sliding friction will occur between the first elastic member 610 and the outer ring of the bearing of the first limit member 220, thereby reducing the wear between the stop seat 510, the first elastic member 610 and the first limit member 220, and improving the service life of the electronic expansion valve.

[0057] In this embodiment, the first limiting member 220 is a metal member, and the inner ring of the bearing of the first limiting member 220 and the screw rod 200 can be welded, bonded or threadedly connected.

[0058] Alternatively, in other embodiments, the inner ring of the bearing of the first limiter 220 is embedded in the outer wall of the screw rod 200. Specifically, the inner ring of the bearing of the first limiter 220 is embedded in the screw rod 200 by integral injection molding.

[0059] Embodiment 3

[0060] In one embodiment, if Figure 6 As shown, the end of the stopper 510 away from the valve mouth 410 is fixedly provided with a first matching portion 5101 that matches the movable guide of the screw rod 200. Specifically, the first matching portion 5101 and the stopper 510 are integrally formed, and the inner wall of the first matching portion 5101 matches the outer wall of the screw rod 200 for movable guidance. The end of the stopper 510 close to the valve mouth 410 is fixedly provided with a second matching portion 5102 that matches the movable limit of the screw rod 200, and the second matching portion 5102 and the stopper 510 are separately formed.

[0061] Thus, by providing the first matching portion 5101 , it is helpful to improve the coaxiality of the screw rod 200 and the stop seat 510 . In addition, the second matching portion 5102 and the stop seat 510 are separately provided, which is helpful for assembling the screw rod 200 in the stop seat 510 .

[0062] In one embodiment, the first matching portion 5101 and the stop seat 510 are integrally formed by injection molding.

[0063] Furthermore, in one embodiment, the second matching portion 5102 stops at one end of the first stopper 220 close to the valve opening 410 to prevent the first stopper 220 from moving toward the valve opening 410. In addition, one end of the first elastic member 610 abuts against the first matching portion 5101, and the other end abuts against the first stopper 220.

[0064] In one embodiment, the valve core assembly 300 includes a sliding nut 310 and a valve needle assembly 320, and one end of the screw rod 200 away from the rotor assembly 100 is threadedly engaged with the sliding nut 310, and the sliding nut 310 and the second mating part 5102 are matched through a limiting structure, so that the screw rod 200 can drive the sliding nut 310 to drive the valve core assembly 300 to move axially along the screw rod 200 relative to the stop seat 510.

[0065] In one embodiment, the limiting structure is a first magnetic component 312 and a second magnetic component 516. The first magnetic component 312 is fixedly provided on the circumferential side of the sliding nut 310. The second matching portion 5102 is fixedly provided with a second magnetic component 516 extending along its own axial direction corresponding to the first magnetic component 312. The corresponding positions of the first magnetic component 312 and the second magnetic component 516 can attract each other or repel each other to prevent the sliding nut 310 from rotating around the axis of the screw rod 200 relative to the stop seat 510.

[0066] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. An electronic expansion valve, characterized in that: The valve seat assembly (400) comprises a stop seat (510), a rotor assembly (100), a screw rod (200), a valve core assembly (300) and a valve seat assembly (400), wherein the stop seat (510) is fixedly connected to the valve seat assembly (400), and the stop seat (510) is arranged on the outer periphery of the screw rod (200), the valve seat assembly (400) is provided with a valve mouth portion (410), the valve core assembly (300) can move relative to the valve seat assembly (400) along the axial direction of the screw rod (200), one end of the screw rod (200) is fixedly connected to the rotor assembly (100), and the other end is connected to the valve core assembly (300), and the rotor assembly (100) can drive the valve core assembly (300) to move in a direction close to or away from the valve mouth portion (410) through the screw rod (200); A first matching portion (5101) that is movably guided by the screw rod (200) is fixedly provided at one end of the stop seat (510) away from the valve mouth portion (410).

2. The electronic expansion valve according to claim 1, characterized in that: The first matching portion (5101) and the stop seat (510) are integrally formed.

3. The electronic expansion valve according to claim 1, characterized in that: A second matching portion (5102) is fixedly provided at one end of the stop seat (510) close to the valve mouth portion (410) and is matched with the screw rod (200) for movable limiting, and the second matching portion (5102) and the stop seat (510) are separately molded.

4. The electronic expansion valve according to claim 3, characterized in that: The electronic expansion valve further comprises a first limit member (220), a second limit member (230) and a first elastic member (610); one of the first limit member (220) and the second limit member (230) is fixedly connected to the stop seat (510), and the other is fixedly connected to the lead screw (200); one end of the first elastic member (610) is connected to the first limit member (220), and the other end is connected to the second limit member (230); when the lead screw (200) moves in a direction from the valve mouth portion (410) to the rotor assembly (100), the first elastic member (610) can generate an elastic pre-tightening force on the lead screw (200) in a direction from the rotor assembly (100) to the valve mouth portion (410).

5. The electronic expansion valve according to claim 4, characterized in that: The first limiting member (220) is fixedly connected to the inner wall of the stop seat (510), the second limiting member (230) is fixedly connected to the outer wall of the screw rod (200), and the first limiting member (220) is arranged at the end of the first elastic member (610) away from the valve mouth portion (410), and the second limiting member (230) is arranged at the end of the first elastic member (610) close to the valve mouth portion (410); the second matching portion (5102) stops at the end of the first limiting member (220) close to the valve mouth portion (410) to prevent the first limiting member (220) from moving toward the valve mouth portion (410), and one end of the first elastic member (610) abuts against the first matching portion (5101), and the other end abuts against the first limiting member (220).

6. The electronic expansion valve according to claim 4, characterized in that: The first limiting member (220) is fixedly connected to the outer wall of the screw rod (200), the second limiting member (230) is fixedly connected to the inner wall of the stop seat (510), and the first limiting member (220) is arranged at one end of the first elastic member (610) close to the valve mouth portion (410), and the second limiting member (230) is arranged at one end of the first elastic member (610) away from the valve mouth portion (410); the second matching portion (5102) stops at one end of the first limiting member (220) close to the valve mouth portion (410) to prevent the first limiting member (220) from moving toward the valve mouth portion (410), and one end of the first elastic member (610) abuts against the first matching portion (5101), and the other end abuts against the first limiting member (220).

7. The electronic expansion valve according to claim 6, characterized in that: The valve core assembly (300) includes a sliding nut (310) and a valve needle assembly (320), and one end of the screw rod (200) away from the rotor assembly (100) is threadedly matched with the sliding nut (310), and the sliding nut (310) and the second matching portion (5102) are matched through a limiting structure, so that the screw rod (200) can drive the sliding nut (310) to drive the valve core assembly (300) to move relative to the stop seat (510) along the axial direction of the screw rod (200).

8. The electronic expansion valve according to claim 7, characterized in that: The limiting structure is a first magnetic component (312) and a second magnetic component (516); the first magnetic component (312) is fixedly provided on the circumferential side of the sliding nut (310); the second matching portion (5102) is fixedly provided with the second magnetic component (516) extending along its own axial direction corresponding to the first magnetic component (312); the corresponding positions of the first magnetic component (312) and the second magnetic component (516) can attract each other or repel each other to prevent the sliding nut (310) from rotating relative to the stop seat (510) around the axis of the screw rod (200).

9. The electronic expansion valve according to claim 6, characterized in that: A first stopper (540) is provided on a side of the stop seat (510) away from the valve mouth (410), and the first stopper (540) constitutes the second limiting member (230).

10. The electronic expansion valve according to claim 1, characterized in that: It also includes a housing (800), which is disposed on the outside of the rotor assembly (100), part of the screw rod (200) and part of the valve core assembly (300) and is welded to the valve seat assembly (400).

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