Electronic expansion valve

Abstract

The electronic expansion valve comprises a stop seat, a rotor assembly, a lead screw, a valve seat assembly, a first limiting piece, a second limiting piece and a first elastic piece, and the valve seat assembly is provided with a valve port part. One of the first limiting piece and the second limiting piece is fixedly connected to the stop base, the other one of the first limiting piece and the second limiting piece is fixedly connected to the lead screw, one end of the first elastic piece is connected with the first limiting piece, and the other end of the first elastic piece is connected with the second limiting piece. The first elastic piece can generate elastic pre-tightening force on the lead screw in the direction from the rotor assembly to the valve port part. According to the electronic expansion valve provided by the invention, the problem that the electronic expansion valve leaks due to the fact that the valve element and the valve port part are prone to loosening 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] When the valve core is in contact with the valve port, the electronic expansion valve is in a closed state. At this time, if the valve core does not have sufficient pre-tightening force to close the valve port, good sealing between the valve core and the valve port cannot be guaranteed, resulting in leakage of the electronic expansion valve. Summary of the invention

[0004] Based on this, it is necessary to provide an electronic expansion valve to solve the problem that the valve core and the valve mouth are easily loosened, resulting in leakage of the electronic expansion valve.

[0005] The electronic expansion valve provided by the present application includes a stop seat, a rotor assembly, a screw rod and a valve seat assembly, wherein the valve seat assembly is provided with a valve mouth portion. The electronic expansion valve also includes a first stopper, a second stopper and a first elastic member, wherein one of the first stopper and the second stopper 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 stopper, and the other end is connected to the second stopper, and when the screw rod moves in a direction from the valve mouth portion 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 portion.

[0006] In one embodiment, the first elastic member is a compression spring, and the first elastic member is sleeved on the outer side of the screw rod.

[0007] In one embodiment, the first limit member is fixedly connected to the inner wall of the stop seat, the second limit member is fixedly connected to the outer wall of the screw rod, and the first limit member is arranged at an end of the first elastic member away from the valve mouth, and the second limit member is arranged at an end of the first elastic member close to the valve mouth.

[0008] In one of the embodiments, the outer wall of the screw rod is provided with a first rod body step, and the first rod body step constitutes the second limiting member.

[0009] In one embodiment, a first seat body step is provided on the inner wall of the stop seat, a first stop portion is provided on a side of the stop seat away from the valve mouth, and a first limiting member is provided between the first stop portion and the first seat body step.

[0010] In one embodiment, a first connecting insert is disposed on the top of the stop seat, and the first stop portion is connected to the first connecting insert.

[0011] In one embodiment, the first limit member is fixedly connected to the outer wall of the screw rod, the second limit member is fixedly connected to the inner wall of the stop seat, and the first limit member is arranged at one end of the first elastic member close to the valve mouth, and the second limit member is arranged at one end of the first elastic member away from the valve mouth.

[0012] In one embodiment, the electronic expansion valve further comprises a limiting collar, which is fixedly sleeved on the outer side of the screw rod, a first seat step is provided on the inner wall of the stop seat, and a first limiting member is provided between the limiting collar and the first seat step.

[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, a first connecting insert is disposed on the top of the stop seat, and the first stop portion is connected to the first connecting insert.

[0015] In one embodiment, the first limiting member is a bearing member.

[0016] In one embodiment, the electronic expansion valve further includes a valve core assembly and a stop ring, and the stop seat is further provided with a second stop portion. When the stop ring stops at the second stop portion, the valve core assembly abuts against the valve opening and closes the valve opening.

[0017] In one embodiment, the electronic expansion valve also includes a valve core assembly, the valve core assembly includes a sliding nut and a valve needle assembly, the sliding nut includes a main body and a connecting portion, the main body is an injection molded part, the sliding nut cooperates with the stop seat or the valve seat assembly through the main body, one end of the connecting portion is fixedly connected to the main body, and the other end is connected to the valve needle assembly.

[0018] Compared with the prior art, when the screw rod works normally, the stop seat supports the screw rod and the rotor assembly, the screw rod rotates in situ with the rotor assembly, and the screw rod does not move along the axial direction. When the screw rod drives the valve core assembly to close the valve mouth, the rotor assembly continues to rotate, and the screw rod continues to rotate relative to the valve core assembly. However, since the valve core assembly has abutted against the valve mouth, the valve core assembly cannot continue to move toward the valve mouth. At this time, under the push of the reaction force, the screw rod moves in the direction away from the valve mouth, and due to the limiting effect of the first limiter and the second limiter, a first elastic member is provided between the screw rod and the stop seat, and the first elastic member is a compression elastic member. Therefore, the screw rod will continue to compress the first elastic member in the process of moving away from the valve mouth. At this time, the first elastic member will in turn apply a force to the screw rod toward the valve mouth, thereby increasing the extrusion force of the valve core assembly on the valve mouth, achieving a pre-tightening effect on the valve mouth, and preventing leakage between the valve core assembly and the valve mouth. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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.

[0020] Figure 1 A schematic diagram of a partial structure of an electronic expansion valve according to an embodiment of the present application;

[0021] Figure 2 A cross-sectional view of an electronic expansion valve according to an embodiment of the present application;

[0022] Figure 3 A cross-sectional view of an electronic expansion valve according to another embodiment of the present application;

[0023] Figure 4 A cross-sectional view of an electronic expansion valve according to another embodiment of the present application;

[0024] Figure 5 A schematic diagram of the partial structure of an electronic expansion valve according to an embodiment of the present application.

[0025] Reference numerals: 100, rotor assembly; 200, screw rod; 210, limiting collar; 220, first limiting member; 230, second limiting member; 240, first rod body step; 300, valve core assembly; 310, sliding nut; 314, main body; 315, connecting part; 320, valve needle assembly; 321, first valve needle; 322, second valve needle; 3221, regulating valve port; 400, valve seat assembly; 410, valve mouth; 510, stop seat; 511, external threaded portion; 5101, first matching portion; 5102, second matching portion; 513, first connecting insert; 518, first seat body step; 520, stop ring; 530, guide rod; 540, first stop portion; 541, annular fixing ring; 542, stop convex strip; 550, second stop portion; 610, first elastic member; 800, shell. DETAILED DESCRIPTION

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] See also Figure 1-Figure 5 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.

[0033] 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.

[0034] 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 also provided with an outer guide rail portion. The stop ring 520 is sleeved on the outer periphery of the stop seat 510 and movably cooperates with the outer guide rail portion. Specifically, the outer peripheral side of the stop seat 510 away from the screw rod 200 is provided with an external thread portion 511. The stop ring 520 is sleeved on the outer periphery of the stop seat 510 and movably cooperates with the external thread 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 spirally move along the external thread portion 511. In addition, the screw rod 200 and the valve core assembly 300 are movably threaded.

[0035] 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.

[0036] It should be noted that the electronic expansion valve further includes a housing 800 , which is disposed on the outside 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 .

[0037] 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 .

[0038] 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.

[0039] 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 matched with the sliding nut 310, and the sliding nut 310 and the stop seat 510 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 relative to the stop seat 510 along the screw rod 200 to open or close the valve mouth 410, and the limiting structure can prevent the sliding nut 310 from rotating around the axis of the screw rod 200 relative to the stop seat 510.

[0040] By providing a limiting structure, the sliding nut 310 can be prevented from rotating relative to the stop seat 510 around the axis of the screw rod 200. At this time, the sliding nut 310 can move relative to the screw rod 200 along the axial direction of the screw rod 200, so that the screw rod 200 drives the sliding nut 310 to drive the valve core assembly 300 to open or close the valve port 410. The relative rotation between the sliding nut 310 and the stop seat 510 is prevented to cause the sliding nut 310 and the stop seat 510 to wear.

[0041] Furthermore, in one embodiment, the sliding nut 310 includes a main body 314 and a connecting portion 315, the main body 314 is an injection molded part, the connecting portion 315 is a metal part, the sliding nut 310 is threadedly connected to the screw rod 200 through the main body 314, the sliding nut 310 cooperates with the stop seat 510 or the valve seat assembly 400 through the main body 314, one end of the connecting portion 315 is fixedly connected to the main body 314, and the other end is welded to the valve needle assembly 320.

[0042] The main body 314 is an injection molded part, which can significantly reduce the weight of the sliding nut 310 and reduce the difficulty of processing the sliding nut 310. The connecting part 315 is a metal part, which is conducive to welding the valve needle assembly 320 through the connecting part 315 of the sliding nut 310, thereby improving the connection strength between the sliding nut 310 and the valve needle assembly 320. In addition, with such a configuration, the same sliding nut 310 can be matched with valve needle assemblies 320 of different specifications, that is, only one sliding nut 310 needs to be made to adapt to valve needle assemblies 320 of different specifications.

[0043] Embodiment 1

[0044] 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.

[0045] In this embodiment, the outer wall of the screw rod 200 is provided with a first rod body step 240 , and the first rod body step 240 constitutes the second limiting member 230 .

[0046] In this way, the assembly of the second position-limiting member 230 and the screw rod 200 is simplified, and the connection firmness between the second position-limiting member 230 and the screw rod 200 is improved.

[0047] 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.

[0048] It can be understood that the bearing member is a special type of shaft connection member. When the first limit member 220 is a bearing member, the screw rod 200 can drive the inner ring of the bearing of the first limit member 220 to rotate synchronously. In this way, the stop seat 510 can provide a limiting effect on the screw rod 200 through the bearing member to ensure the coaxiality of the screw rod 200 and the stop seat 510 and avoid eccentricity of the screw rod 200. In addition, by setting the first limit member 220 as a bearing member, sliding friction between the screw rod 200 and the stop seat 510 is effectively prevented.

[0049] Further, in this embodiment, the bearing inner ring of the first stopper 220 is not 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.

[0050] The valve core assembly 300 includes a sliding nut 310, a first valve needle 321, and a second valve needle 322 that are connected to each other. The 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 stop seat 510 are slidably matched along the axial direction of the screw rod 200, so that the screw rod 200 can drive the sliding nut 310 to drive the second valve needle 322 to open or close the valve port 410 through the first valve needle 321, and the second valve needle 322 is provided with a regulating valve port 3221 that can communicate with the valve port 410. The 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 stop seat 510 are matched through a limiting structure. The stop seat 510 is fixedly connected to the valve seat assembly 400.

[0051] When the first valve needle 321 hits the regulating valve port 3221 or the second valve needle 322 hits the valve port portion 410, a certain impact force is generated, and the impact force is transmitted to the first position limiting member 220 after being reduced by the sliding nut 310 and the stopper 510, thereby avoiding damage to the first position limiting member 220. Therefore, the arrangement of the sliding nut 310 and the stopper 510 can reduce the magnitude of the impact force transmitted to the first position limiting member 220.

[0052] 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 .

[0053] 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.

[0054] 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.

[0055] 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.

[0056] In this embodiment, a first seat step 518 is provided on the inner wall of the stop seat 510 , a first stopper 540 is provided on the side of the stop seat 510 away from the valve mouth 410 , and the first limiting member 220 is disposed between the first stopper 540 and the first seat step 518 .

[0057] In this embodiment, a first connecting insert 513 is disposed on the top of the stopping seat 510 , and the first stopping portion 540 is connected to the first connecting insert 513 .

[0058] Embodiment 2

[0059] 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.

[0060] A first stopper 540 is provided on one side of the stopper seat 510 away from the valve mouth 410. The first stopper 540 can stop the stop ring 520, or the first stopper 540 constitutes the second limiter 230. When the stop ring 520 stops at the first stopper 540, the valve core assembly 300 and the valve mouth 410 are spaced apart and stop moving.

[0061] The first stop portion 540 can stop the stop ring 520 and form the second limit member 230 at the same time. In this way, the first stop portion 540 can simultaneously realize the functions of stopping the stop ring 520 and the first elastic member 610, simplifying the structure of the electronic expansion valve and improving the structural integration of the electronic expansion valve.

[0062] 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.

[0063] 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.

[0064] It can be understood that the bearing member is a special type of shaft connection member. When the first limit member 220 is a bearing member, the screw rod 200 can drive the inner ring of the bearing of the first limit member 220 to rotate synchronously. In this way, the stop seat 510 can provide a limiting effect on the screw rod 200 through the bearing member to ensure the coaxiality of the screw rod 200 and the stop seat 510 and avoid eccentricity of the screw rod 200. In addition, by setting the first limit member 220 as a bearing member, sliding friction between the screw rod 200 and the stop seat 510 is effectively prevented.

[0065] Further, in this embodiment, the outer ring of the bearing of the first stopper 220 is not fixed to 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.

[0066] 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 .

[0067] 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.

[0068] 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.

[0069] 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.

[0070] In this embodiment, the electronic expansion valve also includes a limiting ring 210, which is fixedly sleeved on the outer side of the screw rod 200, and a first seat body step 518 is provided on the inner wall of the stop seat 510, and a first limiting member 220 is provided between the limiting ring 210 and the first seat body step 518.

[0071] In one embodiment, the stop seat 510 is further provided with a second stop portion 550 . When the stop ring 520 stops at the second stop portion 550 , the valve core assembly 300 abuts against the valve port 410 and closes the valve port 410 .

[0072] By providing the first stopper 540 and the second stopper 550, the movement stroke of the stop ring 520 in the external threaded portion 511 can be effectively limited, thereby limiting the rotation angle range of the guide rod 530 relative to the stop seat 510. Since the guide rod 530 is fixedly connected to the rotor assembly 100 or the screw rod 200, such a configuration can effectively limit the rotation angle range of the rotor assembly 100, thereby controlling the movement stroke of the valve core assembly 300 relative to the valve port 410, avoiding wear of the valve core assembly 300 and the valve port 410, and reducing the impact force of the valve core assembly 300 on the valve port 410 when closing the valve. In addition, such a configuration can also prevent the stop ring 520 from moving to the area outside the external threaded portion 511, thereby affecting the thread fit between the stop ring 520 and the stop seat 510.

[0073] Embodiment 3

[0074] In one embodiment, if Figure 4 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.

[0075] 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 .

[0076] 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.

[0077] 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.

[0078] 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, It is characterized in that It comprises a stop seat (510), a rotor assembly (100), a screw rod (200) and a valve seat assembly (400), wherein the valve seat assembly (400) is provided with a valve port portion (410); 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).

2. The electronic expansion valve according to claim 1, It is characterized in that 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).

3. The electronic expansion valve according to claim 1, It is 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 an end of the first elastic member (610) away from the valve mouth portion (410), and the second limiting member (230) is arranged at an end of the first elastic member (610) close to the valve mouth portion (410).

4. The electronic expansion valve according to claim 3, It is characterized in that The outer wall of the screw rod (200) is provided with a first rod body step (240), and the first rod body step (240) constitutes the second position-limiting member (230).

5. The electronic expansion valve according to claim 3, It is characterized in that The inner wall of the stop seat (510) is provided with a first seat body step (518), and the side of the stop seat (510) away from the valve mouth (410) is provided with a first stop portion (540), and the first limiting member (220) is arranged between the first stop portion (540) and the first seat body step (518).

6. The electronic expansion valve according to claim 5, It is characterized in that A first connecting insert (513) is provided on the top of the stop seat (510), and the first stop portion (540) is connected to the first connecting insert (513).

7. The electronic expansion valve according to claim 1, It is 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 an end of the first elastic member (610) close to the valve mouth portion (410), and the second limiting member (230) is arranged at an end of the first elastic member (610) away from the valve mouth portion (410).

8. The electronic expansion valve according to claim 7, It is characterized in that It also includes a limiting ring (210), which is fixedly sleeved on the outer side of the screw rod (200), and the inner wall of the stop seat (510) is provided with a first seat body step (518), and the first limiting member (220) is arranged between the limiting ring (210) and the first seat body step (518).

9. The electronic expansion valve according to claim 7, It is 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 9, It is characterized in that A first connecting insert (513) is provided on the top of the stop seat (510), and the first stop portion (540) is connected to the first connecting insert (513).

11. The electronic expansion valve according to claim 1, It is characterized in that The first limiting member (220) is a bearing member.

12. The electronic expansion valve according to claim 1, It is characterized in that It also includes a valve core assembly (300) and a stop ring (520), and the stop seat (510) is also provided with a second stop portion (550). When the stop ring (520) stops at the second stop portion (550), the valve core assembly (300) abuts against the valve mouth portion (410) and closes the valve mouth portion (410).

13. The electronic expansion valve according to claim 1, It is characterized in that It also includes a valve core assembly (300), the valve core assembly (300) includes a sliding nut (310) and a valve needle assembly (320), the sliding nut (310) includes a main body (314) and a connecting portion (315), the main body (314) is an injection molded part, the sliding nut (310) cooperates with the stop seat (510) or the valve seat assembly (400) through the main body (314), one end of the connecting portion (315) is fixedly connected to the main body (314), and the other end is connected to the valve needle assembly (320).

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