Electronic expansion valve

Abstract

The electronic expansion valve comprises a stop seat, a rotor assembly, a lead screw, a valve seat assembly, a stop structure and a first elastic piece, and the valve seat assembly is provided with a valve port part. The stop structure is arranged on the inner wall of the stop base and can abut against the side portion of the lead screw so as to prevent the lead screw from moving in the direction from the rotor assembly to the valve port portion. The end, close to the valve port part, of the first elastic piece abuts against the lead screw, the end, away from the valve port part, of the first elastic piece abuts against the stop base, and the first elastic piece is in a compressed state. The first elastic piece in the compressed state can generate elastic stopping 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 screw rod is easy to move along the axial direction of the screw rod in the rotating process 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] Usually, the screw of the electronic expansion valve drives the valve core to move along the axial direction of the screw by its own rotation. However, due to the lack of effective limiting measures, the screw is also prone to move along its own axial direction during the rotation process, thereby affecting the operating accuracy 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 lead screw is prone to move along its own axial direction during rotation.

[0005] The electronic expansion valve provided in the present application includes a stop seat, a rotor assembly, a screw rod and a valve seat assembly, and the valve seat assembly is provided with a valve mouth portion. The electronic expansion valve also includes a stop structure and a first elastic member, the stop structure is provided on the inner wall of the stop seat, and the stop structure can abut against the side of the screw rod to prevent the screw rod from moving from the rotor assembly to the valve mouth portion. One end of the first elastic member close to the valve mouth portion abuts against the screw rod, and one end of the first elastic member away from the valve mouth portion abuts against the stop seat, and the first elastic member is in a compressed state. When the screw rod moves from the valve mouth portion to the direction of the rotor assembly, the first elastic member in the compressed state can generate an elastic stop force on the screw rod from the rotor assembly to the direction of the valve mouth portion.

[0006] In one embodiment, the electronic expansion valve also includes a limit ring, which is fixedly sleeved on the outside of the screw rod, and the stop structure includes a first limit member, one end of the first limit member is fixed to the inner wall of the stop seat, and the other end extends along the radial direction of the stop seat toward the direction close to the screw rod, and the first limit member stops at one end of the limit ring close to the valve mouth, one end of the first elastic member away from the valve mouth stops at the first limit member, and one end of the first elastic member close to the valve mouth stops at the outer wall of the screw rod.

[0007] In one embodiment, the stop structure further includes a first seat body step disposed on the inner wall of the stop seat, and the first seat body step stops at an end of the first limiting member close to the valve port.

[0008] 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.

[0009] In one embodiment, the inner ring of the first elastic member is attached to the outer wall of the screw rod.

[0010] In one embodiment, the outer wall of the screw rod is provided with a first rod body step, one end of the first elastic member abuts against the first rod body step, and the other end abuts against the first limiting member.

[0011] In one embodiment, the rotor assembly includes a magnetic rotor and a connecting piece, wherein the magnetic rotor is sleeved on the outer side of the stop seat and fixedly connected to an end of the screw rod away from the valve port through the connecting piece. The outer wall of the screw rod is also provided with a second rod body step, and a limiting collar is clamped between the second rod body step and the connecting piece.

[0012] In one embodiment, the first limit member is a bearing member, and the outer ring of the bearing of the first limit member is fixedly connected to the inner wall of the stop seat, and the inner ring of the bearing of the first limit member is movably sleeved on the outer wall of the screw rod, so that the screw rod can drive the inner ring of the bearing of the first limit member to rotate synchronously, and the screw rod can cooperate with the inner ring of the bearing of the first limit member along its own axial guide.

[0013] In one of the embodiments, a first limit piece is provided on the outer wall fixing sleeve of the screw rod, and the stop structure includes a second seat body step provided on the inner wall of the stop seat, the second seat body step stops at an end of the first limit piece close to the valve mouth to prevent the screw rod from moving toward the valve mouth, and a first stop portion is provided at an end of the stop seat away from the valve mouth, an end of the first elastic member close to the valve mouth stops at the first limit piece, and an end of the first elastic member away from the valve mouth stops at the first stop portion.

[0014] In one embodiment, the outer ring of the first elastic member is attached to the inner wall of the stop seat.

[0015] In one embodiment, the electronic expansion valve further comprises a limiting collar, which is fixedly sleeved on the outside of the screw rod, and the outer wall of the screw rod is further provided with a third rod body step, and the first limiting member is fixedly clamped between the limiting collar and the third rod body step.

[0016] In one embodiment, the first limit member is a bearing member, and the inner ring of the bearing of the first limit member is fixedly connected to the outer wall of the screw rod, and the outer ring of the bearing of the first limit member and the inner wall of the stop seat are guided to cooperate so that the screw rod can drive the inner ring of the bearing of the first limit member to rotate synchronously, and the screw rod can cooperate along its own axial guide relative to the inner ring of the bearing of the first limit member.

[0017] 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.

[0018] 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.

[0019] Compared with the prior art, the stopper structure can prevent the screw rod from moving from the rotor assembly to the valve opening under the stopping action. In addition, the first elastic member can generate an elastic stopping force on the screw rod from the rotor assembly to the valve opening. Therefore, under the two-way stopping action of the stopper structure and the first elastic member, the screw rod can only rotate relative to the stop seat, but cannot move along the axial direction of the stop seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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.

[0021] Figure 1 A schematic diagram of a partial structure of an electronic expansion valve according to an embodiment of the present application;

[0022] Figure 2 A cross-sectional view of an electronic expansion valve according to an embodiment of the present application;

[0023] Figure 3 A cross-sectional view of an electronic expansion valve according to another embodiment of the present application.

[0024] : Illustration marks: 100, rotor assembly; 110, magnetic rotor; 120, connecting piece; 200, screw rod; 210, limiting collar; 220, first limiting piece; 240, first rod body step; 250, second rod body step; 260, third rod body step; 300, valve core assembly; 310, sliding nut; 314, main body; 315, connecting part; 320, valve needle assembly; 400, valve seat assembly; 410, valve mouth; 510, stop seat; 511, external threaded part; 518, first seat body step; 519, second seat body step; 520, stop ring; 530, guide rod; 540, first stop part; 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 3 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 stop structure and a first elastic member 610. The stop structure is arranged on the inner wall of the stop seat 510. The stop structure can abut against the side of the screw rod 200 to prevent the screw rod 200 from moving from the rotor assembly 100 to the valve mouth portion 410; one end of the first elastic member 610 close to the valve mouth portion 410 abuts against the screw rod 200, and one end of the first elastic member 610 away from the valve mouth portion 410 abuts against the stop seat 510, and the first elastic member 610 is in a compressed state. When the screw rod 200 moves from the valve mouth portion 410 to the rotor assembly 100, the first elastic member 610 in the compressed state can generate an elastic stopping force on the screw rod 200 from the rotor assembly 100 to the valve mouth portion 410.

[0033] Under the stopping action of the stopping structure, the screw rod 200 can be prevented from moving from the rotor assembly 100 to the valve opening 410. In addition, the first elastic member 610 can generate an elastic stopping force on the screw rod 200 from the rotor assembly 100 to the valve opening 410. Therefore, under the two-way stopping action of the stopping structure and the first elastic member 610, the screw rod 200 can only rotate relative to the stop seat 510, and cannot move along the axial direction of the stop seat 510.

[0034] Specifically, the screw rod 200 and the valve core assembly 300 are movably threaded.

[0035] 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 .

[0036] It should be noted that the axial limit of the screw rod 200 by the stop structure is a hard limit, so it can effectively ensure that the screw rod 200 cannot break through the limit of the stop structure, and the axial limit of the screw rod 200 by the first elastic member 610 is a soft limit. When the axial force on the screw rod 200 is large enough, the screw rod 200 can break through the limit of the first elastic member 610 to a certain extent. Such a setting, compared with the hard limit at both ends of the screw rod 200, one end is hard limited and the other end is soft limited, which can make the screw rod 200 offset the excessive axial force through the limited axial displacement, prevent the screw rod 200 from excessive wear, and increase the service life of the screw rod 200.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] Embodiment 1

[0042] The electronic expansion valve further includes a limiting collar 210, which is fixedly sleeved on the outside of the lead screw 200. The stop structure includes a first limiting member 220, one end of which is fixedly mounted on the inner wall of the stop seat 510, and the other end of which extends along the radial direction of the stop seat 510 toward the direction close to the lead screw 200, and the first limiting member 220 is stopped at one end of the limiting collar 210 close to the valve port 410. One end of the first elastic member 610 away from the valve port 410 is stopped at the first limiting member 220, and one end of the first elastic member 610 close to the valve port 410 is stopped at the outer wall of the lead screw 200.

[0043] Specifically, the electronic expansion valve also includes a stop ring 520 and a guide rod 530. The stop seat 510 is provided with an external threaded portion 511 on the outer peripheral side away from the screw rod 200. The stop ring 520 is sleeved on the outer periphery of the stop seat 510 and is engaged with the movable thread of 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 spirally along the external threaded portion 511.

[0044] Since the first stopper 220 stops at one end of the stop ring 210 close to the valve opening 410, and one end of the first stopper 220 is fixed to the inner wall of the stop seat 510, the screw rod 200 can be prevented from moving along its own axial direction toward the valve opening 410 under the stopping action of the first stopper 220. In addition, since one end of the first elastic member 610 close to the valve opening 410 stops at the outer wall of the screw rod 200, and one end of the first elastic member 610 away from the valve opening 410 stops at the first stopper 220, and the first elastic member 610 is a compression elastic member, that is, the screw rod 200 is subjected to the thrust of the first elastic member 610 and has a tendency to move toward the valve opening 410, therefore, under the thrust of the first elastic member 610, the screw rod 200 can be prevented from moving along its own axial direction toward the direction away from the valve opening 410.

[0045] Furthermore, in one embodiment, the stopping structure further includes a first seat body step 518 disposed on the inner wall of the stopping seat 510 , and the first seat body step 518 stops at one end of the first limiting member 220 close to the valve port portion 410 .

[0046] 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 .

[0047] 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.

[0048] Furthermore, in one embodiment, the inner ring of the first elastic member 610 is attached to the outer wall of the screw rod 200 .

[0049] In this way, the coaxiality between the first elastic member 610 and the screw rod 200 can be ensured, and the eccentricity of the first elastic member 610 can be avoided.

[0050] However, it is not limited thereto. In other embodiments, the inner ring of the first elastic member 610 and the outer wall of the screw rod 200 may be spaced apart from each other.

[0051] In this way, the first elastic member 610 is prevented from scratching the outer wall of the screw rod 200 during the extension and retraction process.

[0052] It should be noted that in order to improve the assembly firmness of the first elastic member 610, in one embodiment, the outer wall of the screw rod 200 is provided with a first rod body step 240, one end of the first elastic member 610 abuts against the first rod body step 240, and the other end abuts against the first limit member 220.

[0053] In one embodiment, the rotor assembly 100 includes a magnetic rotor 110 and a connecting member 120 . The magnetic rotor 110 is sleeved on the outer side of the stop seat 510 and is fixedly connected to one end of the lead screw 200 away from the valve port 410 through the connecting member 120 .

[0054] Specifically, the lead screw 200 is fixedly inserted in the center of the connecting member 120 , and the outer end of the connecting member 120 is fixedly connected to the inner wall of the magnetic rotor 110 .

[0055] Furthermore, in one embodiment, the outer wall of the screw rod 200 is further provided with a second rod body step 250 , and the limiting collar 210 is clamped between the second rod body step 250 and the connecting member 120 .

[0056] In this way, the connection strength between the limiting collar 210 and the screw rod 200 is effectively improved, and the limiting collar 210 is prevented from moving along the axial direction of the screw rod 200 .

[0057] It should be noted that the thickness of the limiting ring 210 along its own radial direction is greater than the depth of the second rod step 250 along the radial direction of the screw rod 200. In this way, it can be ensured that the limiting ring 210 can protrude from the surface of the screw rod 200 along the radial direction of the screw rod 200, which is beneficial to the abutment between the first limiting member 220 and the limiting ring 210.

[0058] In order to further improve the connection strength between the limiting collar 210 and the screw rod 200 , in one embodiment, the limiting collar 210 is welded, bonded or threadedly connected to the outer wall of the screw rod 200 .

[0059] In one 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 cooperate with the inner ring of the bearing of the first limit member 220 along its own axial guide.

[0060] 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.

[0061] 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 the direction away from the valve port 410, and separate the stop collar 210 and the first stopper 220.

[0062] Furthermore, in one 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 .

[0063] 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.

[0064] In one embodiment, 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.

[0065] Alternatively, 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.

[0066] In one embodiment, the stop seat 510 is further provided with a second stop portion (not shown). When the stop ring 520 stops at the second stop portion, the valve core assembly 300 abuts against the valve port portion 410 and closes the valve port portion 410 .

[0067] By providing the first stop portion 540 and the second stop portion, 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 mouth portion 410, avoiding wear of the valve core assembly 300 and the valve mouth portion 410, and reducing the impact force of the valve core assembly 300 on the valve mouth portion 410 when closing the valve. In addition, such a configuration can also prevent the stop ring 520 from moving to an area outside the external threaded portion 511, thereby affecting the threaded fit between the stop ring 520 and the stop seat 510. Example 2

[0068] The outer wall of the screw rod 200 is fixedly sleeved with a first stopper 220, and the stopper structure includes a second seat step 519 provided on the inner wall of the stopper seat 510, and the second seat step 519 stops at one end of the first stopper 220 close to the valve mouth 410 to prevent the screw rod 200 from moving toward the valve mouth 410. The end of the stopper seat 510 away from the valve mouth 410 is provided with a first stopper 540, and one end of the first elastic member 610 close to the valve mouth 410 stops at the first stopper 220, and one end of the first elastic member 610 away from the valve mouth 410 stops at the first stopper 540.

[0069] At this time, the screw rod 200 and the first stopper 220 move synchronously, and the cooperation between the first stopper 220 and the second seat body step 519 prevents the screw rod 200 from moving toward the valve mouth portion 410. In addition, when the first elastic member 610 is compressed, the first elastic member 610 can exert an elastic blocking force from the rotor assembly 100 to the valve mouth portion 410 on the first stopper 220 to prevent the screw rod 200 from moving in a direction away from the valve mouth portion 410.

[0070] In one embodiment, the outer ring of the first elastic member 610 is attached to the inner wall of the stopping seat 510 .

[0071] In this way, the coaxiality between the first elastic member 610 and the stop seat 510 can be ensured, and the eccentricity of the first elastic member 610 can be avoided.

[0072] However, it is not limited thereto. In other embodiments, the outer ring of the first elastic member 610 and the inner wall of the stop seat 510 may also be spaced apart.

[0073] In this way, the first elastic member 610 is prevented from scratching the inner wall of the stop seat 510 during the expansion and contraction process.

[0074] In one embodiment, the electronic expansion valve also includes a limiting ring 210, which is fixedly sleeved on the outside of the screw rod 200. The outer wall of the screw rod 200 is also provided with a third rod body step 260, and the first limiting member 220 is fixedly clamped between the limiting ring 210 and the third rod body step 260.

[0075] In this way, the connection strength between the first limit member 220 and the screw rod 200 is effectively improved, and the first limit member 220 is prevented from moving along the axial direction of the screw rod 200 .

[0076] In one 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 and the inner wall of the stop seat 510 are guided to cooperate 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 cooperate with the inner ring of the bearing of the first limit member 220 along its own axial guide.

[0077] Such a configuration can effectively ensure the coaxiality of the screw rod 200 and the stop seat 510, and enable the outer ring of the bearing of the first limit member 220 to remain stationary together with the stop seat 510, thereby converting the sliding friction between the screw rod 200 and the stop seat 510 into rolling friction in the first limit member 220, thereby reducing the friction and wear between the screw rod 200 and the stop seat 510 and increasing the service life of the electronic expansion valve.

[0078] Furthermore, in one embodiment, one end of the first elastic member 610 away from the valve opening portion 410 abuts against the outer ring of the bearing of the first limiting member 220 .

[0079] In this way, the axial outer rings of the first elastic member 610 and the first limiting member 220 can be kept fixed together, and no sliding friction occurs between the first elastic member 610 and the outer rings of the bearings of the first limiting member 220, thereby reducing the wear between the stop seat 510, the first elastic member 610 and the first limiting member 220, and improving the service life of the electronic expansion valve.

[0080] In one 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.

[0081] Alternatively, the inner ring of the bearing of the first limiting member 220 is embedded in the outer wall of the screw rod 200. Specifically, the inner ring of the bearing of the first limiting member 220 is embedded in the screw rod 200 by integral injection molding.

[0082] 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.

[0083] 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: 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 stop structure and a first elastic member (610), wherein the stop structure is arranged on the inner wall of the stop seat (510), and the stop structure can abut against the side of the screw rod (200) to prevent the screw rod (200) from moving from the rotor assembly (100) toward the valve mouth (410); one end of the first elastic member (610) close to the valve mouth (410) abuts against the screw rod (200), and the first elastic member (610) is provided on the inner wall of the stop seat (510), and the stop structure can abut against the side of the screw rod (200) to prevent the screw rod (200) from moving from the rotor assembly (100) toward the valve mouth (410). One end of the elastic member (610) away from the valve mouth portion (410) abuts against the stop seat (510), and the first elastic member (610) is in a compressed state. When the screw rod (200) moves from the valve mouth portion (410) toward the rotor assembly (100), the first elastic member (610) in the compressed state can generate an elastic stopping force on the screw rod (200) in the direction from the rotor assembly (100) toward the valve mouth portion (410).

2. The electronic expansion valve according to claim 1, characterized in that: It also includes a limiting ring (210), which is fixedly sleeved on the outside of the screw rod (200), and the stopping structure includes a first limiting member (220), one end of the first limiting member (220) is fixedly arranged on the inner wall of the stop seat (510), and the other end extends along the radial direction of the stop seat (510) toward the direction close to the screw rod (200), and the first limiting member (220) stops at one end of the limiting ring (210) close to the valve mouth part (410), and one end of the first elastic member (610) away from the valve mouth part (410) stops at the first limiting member (220), and one end of the first elastic member (610) close to the valve mouth part (410) stops at the outer wall of the screw rod (200).

3. The electronic expansion valve according to claim 2, characterized in that: The stop structure further comprises a first seat body step (518) provided on the inner wall of the stop seat (510), wherein the first seat body step (518) stops at an end of the first limiting member (220) close to the valve opening (410); And / or, 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); And / or, the inner ring of the first elastic member (610) is attached to the outer wall of the screw rod (200).

4. The electronic expansion valve according to claim 2, characterized in that: The outer wall of the screw rod (200) is provided with a first rod body step (240); one end of the first elastic member (610) abuts against the first rod body step (240), and the other end abuts against the first limiting member (220).

5. The electronic expansion valve according to claim 2, characterized in that: The rotor assembly (100) comprises a magnetic rotor (110) and a connecting piece (120); the magnetic rotor (110) is sleeved on the outer side of the stop seat (510) and fixedly connected to an end of the lead screw (200) away from the valve port (410) through the connecting piece (120); The outer wall of the screw rod (200) is also provided with a second rod body step (250), and the limiting collar (210) is clamped between the second rod body step (250) and the connecting member (120).

6. The electronic expansion valve according to claim 2, characterized in that: The first limiting member (220) is a bearing member, and the outer ring of the bearing of the first limiting member (220) is fixedly connected to the inner wall of the stop seat (510), and the inner ring of the bearing of the first limiting 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 limiting member (220) to rotate synchronously, and the screw rod (200) can cooperate with the inner ring of the bearing of the first limiting member (220) along its own axial guide.

7. The electronic expansion valve according to claim 1, characterized in that: The outer wall fixing sleeve of the screw rod (200) is provided with a first limit piece (220), and the stopping structure includes a second seat body step (519) provided on the inner wall of the stop seat (510), and the second seat body step (519) stops at an end of the first limit piece (220) close to the valve mouth part (410) to prevent the screw rod (200) from moving toward the valve mouth part (410), and the end of the stop seat (510) away from the valve mouth part (410) is provided with a first stop part (540), and the end of the first elastic member (610) close to the valve mouth part (410) stops at the first limit piece (220), and the end of the first elastic member (610) away from the valve mouth part (410) stops at the first stop part (540).

8. The electronic expansion valve according to claim 7, characterized in that: The outer ring of the first elastic member (610) is attached to the inner wall of the stop seat (510).

9. The electronic expansion valve according to claim 7, characterized in that: It also includes a limiting ring (210), the limiting ring (210) is fixedly sleeved on the outside of the screw rod (200), the outer wall of the screw rod (200) is also provided with a third rod body step (260), and the first limiting member (220) is fixedly clamped between the limiting ring (210) and the third rod body step (260).

10. The electronic expansion valve according to claim 7, characterized in that: The first limiting member (220) is a bearing member, and the inner ring of the bearing of the first limiting member (220) is fixedly connected to the outer wall of the screw rod (200), and the outer ring of the bearing of the first limiting member (220) and the inner wall of the stop seat (510) are guided to cooperate so that the screw rod (200) can drive the inner ring of the bearing of the first limiting member (220) to rotate synchronously, and the screw rod (200) can cooperate with the inner ring of the bearing of the first limiting member (220) along its own axial direction.

11. The electronic expansion valve according to claim 1, 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. When the stop ring (520) stops at the second stop portion, the valve core assembly (300) abuts against the valve mouth portion (410) and closes the valve mouth portion (410).

12. The electronic expansion valve according to claim 1, 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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