Electronic expansion valve

Abstract

An electronic expansion valve. The electronic expansion valve comprises a stop seat (510), a rotor assembly (100), a lead screw (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 elastic member (610), wherein one end of the first elastic member (610) is directly or indirectly connected to the stop seat (510), and the other end of the first elastic member (610) is directly or indirectly connected to the lead screw (200); and when the lead screw (200) moves in a direction from the valve port portion (410) to the rotor assembly (100), the first elastic member (610) can generate for the lead screw (200) an elastic pre-tightening force in a direction from the rotor assembly (100) to the valve port portion (410).

Description

Electronic expansion valve

[0001] Related applications

[0002] This application claims priority to Chinese patent application No. 202321595997.0, filed on June 19, 2023, and entitled “Electronic Expansion Valve”, priority to Chinese patent application No. 202311631561.7, filed on November 30, 2023, and entitled “Electronic Expansion Valve”, priority to Chinese patent application No. 202311633139.5, filed on November 30, 2023, and entitled “Electronic Expansion Valve”, priority to Chinese patent application No. 202323273080.1, filed on November 30, 2023, and priority to Chinese patent application No. 202323270079.3, filed on November 30, 2023, and entitled “Electronic Expansion Valve”, the entire text of which is hereby incorporated by reference. Technical Field

[0003] The present application relates to the field of valve body technology, and in particular to an electronic expansion valve. Background Art

[0004] As a new type of control element, the electronic expansion valve has long 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 true realization of refrigeration system optimization, and a symbol of the mechatronics of the refrigeration system. It has been applied in more and more fields.

[0005] When the valve core abuts against 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, a good sealing performance between the valve core and the valve port cannot be guaranteed, resulting in leakage of the electronic expansion valve.

[0006] Summary of the Invention

[0007] 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.

[0008] The present application provides an electronic expansion valve comprising 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 comprises a first elastic member, one end of the first elastic member is directly or indirectly connected to the stop seat, and the other end is directly or indirectly connected to the screw rod, and when the screw rod moves in the 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 toward the valve mouth portion.

[0009] In some embodiments, the electronic expansion valve further includes a first limiting member and a second limiting member, one of the first limiting member and the second limiting member is fixedly connected to the stop seat, and the other is fixedly connected to the screw rod.

[0010] In some embodiments, the first elastic member is a compression spring, and the first elastic member is sleeved on the outside of the screw rod.

[0011] In some embodiments, 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 end of the first elastic member away from the valve mouth abuts against the first limit member, and the end of the first elastic member close to the valve mouth abuts against the second limit member.

[0012] In some 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.

[0013] In some embodiments, a first seat 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 the first limiting member is provided between the first stop portion and the first seat step.

[0014] In some embodiments, a first connecting insert is provided on the top of the stop seat, and the first stopping portion is connected to the first connecting insert.

[0015] In some embodiments, the first limiting member is fixedly connected to the outer wall of the screw rod, the second limiting member is fixedly connected to the inner wall of the stop seat, the end of the first elastic member close to the valve mouth abuts against the first limiting member, and the end of the first elastic member away from the valve mouth abuts against the second limiting member.

[0016] In some embodiments, a limiting ring is further included, which is fixedly sleeved on the outside of the screw rod, and the limiting ring is stopped at the end of the first limiting member away from the valve mouth; the inner wall of the stop seat is provided with a first seat body step, and the first limiting member is provided between the limiting ring and the first seat body step.

[0017] In some embodiments, a first stop portion is provided on a side of the stop seat away from the valve mouth portion, and the first stop portion constitutes the second limiting member.

[0018] In some embodiments, a first connecting insert is provided on the top of the stop seat, and the first stop portion is connected to the first connecting insert. In some embodiments, a valve core assembly and a stop ring are further provided on the stop seat, and a second stop portion is provided. When the stop ring stops at the second stop portion, the valve core assembly abuts against the valve opening and closes the valve opening.

[0019] In some embodiments, a valve core assembly is also included, which includes a sliding nut and a valve needle assembly. The sliding nut includes a main body and a connecting part. The main body is an injection molded part. The sliding nut cooperates with the stop seat or valve seat assembly through the main body. One end of the connecting part is fixedly connected to the main body, and the other end is connected to the valve needle assembly.

[0020] In some embodiments, the electronic expansion valve also includes a stop structure, which 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 toward the valve mouth portion; one end of the first elastic member close to the valve mouth portion abuts against the screw rod, and the 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 toward the rotor assembly, the compressed first elastic member can generate an elastic stopping force on the screw rod from the rotor assembly toward the valve mouth portion.

[0021] In some embodiments, a limiting ring is further included, which is fixedly sleeved on the outside of the screw rod, and the stop structure includes a first limiting member, one end of the first limiting 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 limiting member stops at the end of the limiting ring close to the valve mouth part, the end of the first elastic member away from the valve mouth part stops at the first limiting member, and the end of the first elastic member close to the valve mouth part stops at the outer wall of the screw rod.

[0022] In some embodiments, the stopping structure further includes a first seat step provided on an inner wall of the stopping seat, and the first seat step stops at an end of the first limiting member close to the valve mouth.

[0023] In some embodiments, a first rod step is provided on an outer wall of the screw rod, one end of the first elastic member abuts against the first rod step, and the other end abuts against the first limiting member.

[0024] In some embodiments, the rotor assembly includes a magnetic rotor and a connecting piece, the magnetic rotor is sleeved on the outside of the stop seat and is fixedly connected to the end of the screw away from the valve mouth through the connecting piece; the limiting ring is clamped between the first limiting piece and the connecting piece.

[0025] In some embodiments, the first limiting member is a bearing member, and the outer ring of the bearing of the first limiting member is fixedly connected to the inner wall of the stop seat, the inner ring of the bearing of the first limiting member is movably sleeved on the outer wall of the screw rod, and the screw rod is guided and matched with the inner ring of the bearing of the first limiting member.

[0026] In some embodiments, the outer wall of the screw rod is fixedly sleeved with a first limiter, the stop structure includes a second seat step provided on the inner wall of the stop seat, the second seat step stops at the end of the first limiter close to the valve mouth portion to prevent the screw rod from moving toward the valve mouth portion, the end of the stop seat away from the valve mouth portion is provided with a first stop portion, the end of the first elastic member close to the valve mouth portion stops at the first limiter, and the end of the first elastic member away from the valve mouth portion stops at the first stop portion. In some embodiments, a limit collar is further included, the limit collar fixedly sleeved on the outside of the screw rod, the outer wall of the screw rod is further provided with a third rod step, and the first limiter is fixedly clamped between the limit collar and the third rod step.

[0027] In some embodiments, the first limiting member is a bearing member, and the inner ring of the bearing of the first limiting member is fixedly connected to the outer wall of the screw rod, and the outer ring of the bearing of the first limiting member is guided and matched with the inner wall of the stop seat.

[0028] In some embodiments, the electronic expansion valve further includes a first limit member, wherein the first limit member is a bearing member, the outer ring of the bearing of the first limit member is limited to the inner wall of the stop seat, and the inner ring of the bearing of the first limit member is stopped at the outer wall of the screw rod to prevent the screw rod from moving toward the valve mouth; the end of the first elastic member close to the valve mouth portion abuts against the screw rod, and the end of the first elastic member away from the valve mouth portion abuts against the inner ring of the first limit member.

[0029] In some embodiments, a first stop portion is provided at one end of the stop seat away from the valve mouth, and a bearing outer ring of the first limiting member is embedded between the first stop portion and the stop seat.

[0030] In some embodiments, the stop seat includes a stop body and a first connecting insert, the stop body is an injection-molded part, one end of the first connecting insert is embedded in the stop body, and the other end is welded to the first stop portion.

[0031] In some embodiments, the stop seat further includes a second connecting insert, one end of the second connecting insert is embedded in the stop body, and the other end is welded to the valve seat assembly.

[0032] In some embodiments, the electronic expansion valve also includes a first limit member, which is a bearing member. 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 is stopped on the inner wall of the stop seat to prevent the screw rod from moving toward the valve mouth. One end of the first elastic member 610 close to the valve mouth portion 410 abuts against the outer ring of the bearing of the first limit member 220, and the end of the first elastic member away from the valve mouth portion directly or indirectly stops on the inner wall of the stop seat.

[0033] In some embodiments, a first stop portion is provided on the side of the stop seat away from the valve mouth portion, and the first stop portion constitutes the second limiting member; optionally, the first stop portion includes an annular fixing ring, the inner side of the annular fixing ring is arranged around the circumference of the screw rod, and the outer ring of the annular fixing ring is fixedly connected to the inner wall of the stop seat.

[0034] In some embodiments, the stop seat includes a stop body and a first connecting insert, the stop body is an injection molded part, one end of the first connecting insert is embedded in the stop body, and the other end is welded to the annular fixing ring.

[0035] Compared with the prior art, when the screw rod is working normally, the stop seat supports the screw rod and the rotor assembly, and the screw rod rotates in place with the rotor assembly, and the screw rod does not move axially. 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 already abutted 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 a direction away from the valve mouth, and a first elastic member is clamped 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

[0036] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the disclosed drawings without any creative work.

[0037] FIG1 is a schematic diagram of a partial structure of an electronic expansion valve according to an embodiment of the present application.

[0038] FIG2 is a cross-sectional view of an electronic expansion valve according to an embodiment of the present application.

[0039] FIG3 is a cross-sectional view of an electronic expansion valve according to another embodiment of the present application.

[0040] FIG4 is a cross-sectional view of an electronic expansion valve according to another embodiment of the present application.

[0041] FIG5 is a schematic diagram of a partial structure of an electronic expansion valve according to an embodiment of the present application.

[0042] Figure numerals: 100, rotor assembly; 110, magnetic rotor; 120, connecting member; 200, screw rod; 210, limiting collar; 220, first limiting member; 230, second limiting member; 240, first rod step; 250, second rod step; 260, third rod step; 300, valve core assembly; 310, sliding nut; 314, main body; 315, connecting member; 320, valve needle assembly; 321, first valve needle; 322, second valve needle; 3221, regulating valve port; 400, valve Seat assembly; 410, valve mouth portion; 510, stop seat; 511, external thread portion; 5101, first matching portion; 5102, second matching portion; 512, stop body; 513, first connecting insert; 514, second connecting insert; 518, first seat body step; 519, second seat body step; 520, stop ring; 530, guide rod; 540, first stop portion; 541, annular fixing ring; 542, stop ridge; 550, second stop portion; 610, first elastic member; 800, shell. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0044] 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 device or element referred to 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.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0046] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0047] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it 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. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0048] 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 an intermediate 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 an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are intended only to describe specific embodiments and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0050] Please refer to Figures 1 to 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.

[0051] In some embodiments, 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.

[0052] Specifically, the electronic expansion valve also includes a stop ring 520 and a guide rod 530. The outer circumference of the stop seat 510 facing away from the screw 200 is further provided with an external guide rail portion. The stop ring 520 is sleeved around the outer circumference of the stop seat 510 and movably engages with the outer guide rail portion. Specifically, the outer circumference of the stop seat 510 facing away from the screw 200 is provided with an external threaded portion 511. The stop ring 520 sleeves around the outer circumference of the stop seat 510 and movably engages with the external threaded portion 511. The guide rod 530 is fixedly connected to the rotor assembly 100 or the screw 200, enabling the rotor assembly 100 to drive the guide rod 530 to push the stop ring 520 for spiral motion along the external threaded portion 511. Furthermore, the screw 200 and the valve core assembly 300 movably engage with each other.

[0053] When the screw rod 200 is working 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 in the axial direction. When the screw rod 200 drives the valve core assembly 300 to close the valve mouth portion 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 already abutted the valve mouth portion 410, the valve core assembly 300 cannot continue to move toward the valve mouth portion 410. At this time, under the push of the reaction force, the screw rod 200 moves in a direction away from the valve mouth portion 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 screw rod 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 screw rod 200 toward the valve mouth portion 410, thereby increasing the extrusion 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.

[0054] In some embodiments, the electronic expansion valve further includes a first stopper 220 and a first elastic member 610. The first stopper 220 is a bearing member. The outer ring of the bearing of the first stopper 220 is restrained by the inner wall of the stop seat 510, and the inner ring of the bearing of the first stopper 220 is abutted against the outer wall of the lead screw 200 to prevent the lead screw 200 from moving toward the valve mouth 410. The end of the first elastic member 610 near the valve mouth 410 abuts against the lead screw 200, while the end of the first elastic member 610 away from the valve mouth 410 abuts against the inner ring of the first stopper 220. When the lead screw 200 moves from the valve mouth 410 to the rotor assembly 100, the first elastic member 610 can generate an elastic preload force on the lead screw 200 from the rotor assembly 100 toward the valve mouth 410.

[0055] Specifically, the electronic expansion valve also includes a stop ring 520 and a guide rod 530. The outer circumference of the stop seat 510 facing away from the screw rod 200 is provided with an externally threaded portion 511. The stop ring 520 is sleeved around the outer circumference of the stop seat 510 and movably engages with the externally 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 for spiral motion along the externally threaded portion 511. Furthermore, the electronic expansion valve also includes a housing 800, which is disposed outside the rotor assembly 100, a portion of the screw rod 200, and a portion of the valve core assembly 300 and is welded to the valve seat assembly 400. Furthermore, the screw rod 200 and the valve core assembly 300 movably engage with each other through threads.

[0056] When the screw rod 200 drives the valve core assembly 300 to close the valve port 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 already abutted the valve port 410, the valve core assembly 300 cannot continue to move toward the valve port 410. At this time, driven by the reaction force, the screw rod 200 moves away from the valve port 410. Moreover, since the first elastic member 610 is a compression elastic member, the screw rod 200 will continue to compress the first elastic member 610 during its movement away from the valve port 410. At this time, the first elastic member 610 in turn exerts a force on the screw rod 200 toward the valve port 410, thereby increasing the extrusion force of the valve core assembly 300 on the valve port 410, thereby pre-tightening the valve port 410 and preventing the valve core assembly 300 and the valve port 410 from loosening and leaking.

[0057] In order to facilitate the inner ring of the first limit member 220 to support the screw rod 200, in one embodiment, the electronic expansion valve also includes a limit ring 210, which is fixedly sleeved on the outside of the screw rod 200, and the limit ring 210 stops at the end of the first limit member 220 away from the valve mouth portion 410.

[0058] Since the limiting ring 210 is fixedly mounted on the outside of the screw rod 200 and is stopped at the end of the first limiting member 220 away from the valve mouth portion 410, the screw rod 200 cannot move toward the direction close to the valve mouth portion 410 under the limiting action of the limiting ring 210. In this way, the screw rod 200 cannot apply a pre-tightening force to the connection between the valve core assembly 300 and the valve mouth portion 410 by moving itself toward the direction close to the valve mouth portion 410. That is, the screw rod 200 can only apply a pre-tightening force to the connection between the valve core assembly 300 and the valve mouth portion 410 by compressing the first elastic member 610.

[0059] In order to facilitate the abutment between the end of the first elastic member 610 close to the valve mouth portion 410 and the screw rod 200, in one embodiment, the electronic expansion valve also includes a second limiting member 230, which is fixedly connected to the outer wall of the screw rod 200, and the end of the first elastic member 610 close to the valve mouth portion 410 abuts against the second limiting member 230.

[0060] In one embodiment, the stopper 510 is provided with a first stopper 540 for limiting the distance that the valve core assembly 300 can move toward the end away from the valve port 410. The outer ring of the bearing of the first limiter 220 is embedded between the first stopper 540 and the stopper 510. The stopper 510 includes a stopper body 512 and a first connecting insert 513. The stopper body 512 is an injection-molded part. One end of the first connecting insert 513 is embedded in the stopper body 512 and the other end is welded to the first stopper 540. Furthermore, in one embodiment, the stopper 510 also includes a second connecting insert 514. One end of the second connecting insert 514 is embedded in the stopper body 512 and the other end is welded to the valve seat assembly 400.

[0061] In some embodiments, the electronic expansion valve further includes a first stopper 220 and a first elastic member 610. The first stopper 220 is a bearing member. The inner ring of the bearing of the first stopper 220 is fixedly connected to the outer wall of the lead screw 200. The outer ring of the bearing of the first stopper 220 abuts against the inner wall of the stop seat 510 to prevent the lead screw 200 from moving toward the valve mouth 410. The end of the first elastic member 610 proximal to the valve mouth 410 abuts against the first stopper 220, while the end of the first elastic member 610 distal to the valve mouth 410 directly or indirectly abuts against the inner wall of the stop seat 510. When the lead screw 200 moves from the valve mouth 410 to the rotor assembly 100, the first elastic member 610 can generate an elastic preload force on the lead screw 200 from the rotor assembly 100 toward the valve mouth 410.

[0062] Specifically, the electronic expansion valve further includes a stop ring 520 and a guide rod 530. An external threaded portion 511 is provided on the outer circumference of the stop seat 510 facing away from the screw rod 200. The stop ring 520 is sleeved around the outer circumference of the stop seat 510 and movably engages 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 spiral along the external threaded portion 511. Furthermore, the screw rod 200 and the valve core assembly 300 movably engage with each other.

[0063] When the screw rod 200 drives the valve core assembly 300 to close the valve port 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 already abutted the valve port 410, the valve core assembly 300 cannot continue to move toward the valve port 410. At this time, driven by the reaction force, the screw rod 200 moves away from the valve port 410. Moreover, since the first elastic member 610 is a compression elastic member, the screw rod 200 will continue to compress the first elastic member 610 during its movement away from the valve port 410. At this time, the first elastic member 610 in turn exerts a force on the screw rod 200 toward the valve port 410, thereby increasing the extrusion force of the valve core assembly 300 on the valve port 410, thereby pre-tightening the valve port 410 and preventing the valve core assembly 300 and the valve port 410 from loosening and leaking.

[0064] In order to facilitate the inner ring of the first limit member 220 to support the screw rod 200, in one embodiment, the electronic expansion valve also includes a limit ring 210, which is fixedly sleeved on the outside of the screw rod 200, and the limit ring 210 stops at the end of the first limit member 220 away from the valve mouth portion 410.

[0065] Since the limiting ring 210 is fixedly mounted on the outside of the screw rod 200 and is stopped at the end of the first limiting member 220 away from the valve mouth portion 410, the screw rod 200 cannot move toward the direction close to the valve mouth portion 410 under the limiting action of the limiting ring 210. In this way, the screw rod 200 cannot apply a pre-tightening force to the connection between the valve core assembly 300 and the valve mouth portion 410 by moving itself toward the direction close to the valve mouth portion 410. That is, the screw rod 200 can only apply a pre-tightening force to the connection between the valve core assembly 300 and the valve mouth portion 410 by compressing the first elastic member 610.

[0066] In some embodiments, 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, the inner ring of the bearing of the first limiting member 220 is movably sleeved on the outer wall of the screw rod 200, and the screw rod 200 is guided and matched with the inner ring of the bearing of the first limiting member 220.

[0067] In this embodiment, the guiding fit is a clearance fit, and the guide fit between the screw rod 200 and the inner ring of the bearing of the first limiting member 220 can prevent the screw rod 200 from being deflected.

[0068] In some embodiments, 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 and matched.

[0069] In this embodiment, the guiding fit is a clearance fit, and the guiding fit between the outer ring of the bearing of the first limiting member 220 and the inner wall of the stop seat 510 can prevent the screw rod 200 from being deflected.

[0070] In some embodiments, the electronic expansion valve also includes a stop structure and a first elastic member 610. The stop structure 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 portion 410; one end of the first elastic member 610 close to the valve mouth portion 410 abuts against the screw rod 200, and the 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 toward the rotor assembly 100, the compressed first elastic member 610 can generate an elastic stopping force on the screw rod 200 from the rotor assembly 100 toward the valve mouth portion 410.

[0071] The stop structure prevents the screw rod 200 from moving from the rotor assembly 100 toward the valve opening 410. Furthermore, the first elastic member 610 exerts an elastic stopping force on the screw rod 200 in the direction from the rotor assembly 100 toward the valve opening 410. Therefore, under the bidirectional stopping action of the stop structure and the first elastic member 610, the screw rod 200 can only rotate relative to the stop seat 510 and cannot move axially along the stop seat 510.

[0072] In some embodiments, the screw rod 200 and the valve core assembly 300 are movably threaded.

[0073] It should be noted that the axial limit imposed by the stop structure on the screw rod 200 is a hard limit, which effectively ensures that the screw rod 200 cannot break through the limit of the stop structure, while the axial limit imposed by the first elastic member 610 on the screw rod 200 is a soft limit. When the axial force applied to the screw rod 200 is large enough, the screw rod 200 can, to a certain extent, break through the limit of the first elastic member 610. This arrangement, compared to having hard limits at both ends of the screw rod 200, with one end being hard-limited and the other end being soft-limited, enables the screw rod 200 to offset excessive axial forces through limited axial displacement, thereby preventing excessive wear of the screw rod 200 and increasing the service life of the screw rod 200.

[0074] 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 .

[0075] 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 .

[0076] In this way, the difficulty of processing the first elastic member 610 is significantly reduced, and the difficulty of assembling the first elastic member 610 and the screw rod 200 is reduced.

[0077] In one embodiment, the valve core assembly 300 includes a sliding nut 310 and a valve needle assembly 320, and the 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 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 portion 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.

[0078] The limiting structure prevents the sliding nut 310 from rotating relative to the stopper 510 about the axis of the screw shaft 200. At this time, the sliding nut 310 can move relative to the screw shaft 200 along the axial direction of the screw shaft 200, so that the screw shaft 200 drives the sliding nut 310 to drive the valve core assembly 300 to open or close the valve port 410. This prevents the sliding nut 310 and the stopper 510 from rotating relative to each other, which may cause wear on the sliding nut 310 and the stopper 510.

[0079] 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, and 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, and 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.

[0080] The main body 314 is an injection-molded part, significantly reducing the weight of the sliding nut 310 and simplifying its processing. The connecting portion 315 is a metal component, facilitating welding of the sliding nut 310 to the valve needle assembly 320 via the connecting portion 315, thereby enhancing the connection strength between the sliding nut 310 and the valve needle assembly 320. Furthermore, this arrangement allows the same sliding nut 310 to be compatible with valve needle assemblies 320 of varying specifications. In other words, only one sliding nut 310 needs to be manufactured to accommodate valve needle assemblies 320 of varying specifications.

[0081] Example 1

[0082] 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 the end of the first elastic member 610 away from the valve mouth portion 410, and the second limit member 230 is arranged at the end of the first elastic member 610 close to the valve mouth portion 410.

[0083] In this embodiment, a first rod step 240 is provided on the outer wall of the screw rod 200 , and the first rod step 240 constitutes the second limiting member 230 .

[0084] In this way, the assembly of the second limiting member 230 and the screw rod 200 is simplified, and the connection firmness between the second limiting member 230 and the screw rod 200 is improved.

[0085] 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.

[0086] It is understood that a bearing is a relatively special type of shaft-type connecting component. When the first limiting member 220 is a bearing, the screw rod 200 can drive the inner ring of the bearing of the first limiting 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, thereby ensuring the coaxiality of the screw rod 200 and the stop seat 510 and preventing eccentricity of the screw rod 200. In addition, by configuring the first limiting member 220 as a bearing, sliding friction between the screw rod 200 and the stop seat 510 is effectively prevented.

[0087] Furthermore, 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 axially relative to the bearing inner ring of the first stopper 220. That is, a certain friction exists between the screw rod 200 and the bearing inner ring of the first stopper 220, which 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 does not restrict the movement of the screw rod 200. Specifically, when the valve core assembly 300 blocks the valve port 410, continuing to rotate the screw rod 200 will prevent the valve core assembly 300 from moving further. 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 preload force to the connection between the valve core assembly 300 and the valve port 410.

[0088] The valve core assembly 300 includes a sliding nut 310, a first valve needle 321, and a second valve needle 322 that are interconnected. The end of the screw rod 200 that is away from the rotor assembly 100 is threadedly engaged with the sliding nut 310. The sliding nut 310 and the stopper 510 slide together along the axial direction of the screw rod 200, enabling the screw rod 200 to drive the sliding nut 310, via the first valve needle 321, to drive the second valve needle 322 to open or close the valve port 410. 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 that is away from the rotor assembly 100 is threadedly engaged with the sliding nut 310. The sliding nut 310 and the stopper 510 are engaged via a limiting structure. The stopper 510 is fixedly connected to the valve seat assembly 400.

[0089] When the first valve needle 321 strikes the regulating valve port 3221 or the second valve needle 322 strikes the valve port portion 410, a certain impact force is generated. This impact force is dissipated by the sliding nut 310 and the stopper 510 before being transmitted to the first stopper 220, thereby preventing damage to the first stopper 220. Therefore, the provision of the sliding nut 310 and the stopper 510 can reduce the magnitude of the impact force transmitted to the first stopper 220.

[0090] Furthermore, in this embodiment, one end of the first elastic member 610 away from the valve opening 410 abuts against the inner ring of the bearing of the first limiting member 220 .

[0091] In this way, the first elastic member 610, the inner ring of the bearing of the first limit member 220, the screw 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 200, the first elastic member 610 and the first limit member 220, and improving the service life of the electronic expansion valve.

[0092] 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.

[0093] In another embodiment, the outer ring of the bearing of the first limiting member 220 is clamped and embedded in the inner wall of the stopping seat 510 .

[0094] In another embodiment, the outer ring of the bearing of the first limiting member 220 is bonded and embedded in the inner wall of the stopping seat 510 .

[0095] 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 threaded.

[0096] In this embodiment, a first seat step 518 is provided on the inner wall of the stop seat 510 , a first stop portion 540 is provided on the side of the stop seat 510 away from the valve mouth portion 410 , and the first limiting member 220 is provided between the first stop portion 540 and the first seat step 518 .

[0097] In this embodiment, a first connecting insert 513 is provided on the top of the stopping seat 510 , and the first stopping portion 540 is connected to the first connecting insert 513 .

[0098] 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 .

[0099] The provision of the first stopper 540 and the second stopper 550 effectively limits the travel of the stop ring 520 within the external threaded portion 511, thereby limiting the angular range of rotation 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, this arrangement effectively limits the angular range of rotation of the rotor assembly 100, thereby controlling the travel of the valve core assembly 300 relative to the valve opening 410, thereby preventing wear on the valve core assembly 300 and the valve opening 410 and reducing the impact force of the valve core assembly 300 on the valve opening 410 when the valve is closed. Furthermore, this arrangement prevents the stop ring 520 from moving beyond the external threaded portion 511, thereby affecting the threaded fit between the stop ring 520 and the stop seat 510.

[0100] Example 2

[0101] 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.

[0102] A first stopper 540 is provided on a side of the stopper seat 510 away from the valve opening 410. The first stopper 540 can stop the stop ring 520, or the first stopper 540 can constitute the second position limiting member 230. 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.

[0103] The first stop portion 540 can simultaneously stop the stopping ring 520 and form the second limiting member 230. In this way, the first stop portion 540 can simultaneously realize the functions of stopping the stopping 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.

[0104] 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.

[0105] In this embodiment, 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 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 limiting 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 limiting member 220.

[0106] It is understood that a bearing is a relatively special type of shaft-type connecting component. When the first limiting member 220 is a bearing, the screw rod 200 can drive the inner ring of the bearing of the first limiting 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, thereby ensuring the coaxiality of the screw rod 200 and the stop seat 510 and preventing eccentricity of the screw rod 200. In addition, by configuring the first limiting member 220 as a bearing, sliding friction between the screw rod 200 and the stop seat 510 is effectively prevented.

[0107] Furthermore, 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 axially 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 does not restrict the movement of the screw rod 200. More specifically, when the valve core assembly 300 blocks the valve port 410, continuing to rotate the screw rod 200 will prevent the valve core assembly 300 from moving further. 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 preload force to the connection between the valve core assembly 300 and the valve port 410.

[0108] 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 .

[0109] 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.

[0110] In this embodiment, the first limiting member 220 is a metal member, and the bearing inner ring of the first limiting member 220 and the screw rod 200 can be welded, bonded or threaded.

[0111] Alternatively, in other embodiments, the inner ring of the bearing of the first limiting member 220 is embedded in the outer wall of the screw rod 200 .

[0112] Furthermore, in one embodiment, the inner ring of the bearing of the first limiting member 220 is injection-molded and embedded in the outer wall of the screw rod 200 .

[0113] In another embodiment, the inner ring of the bearing of the first limiting member 220 is clamped and embedded in the outer wall of the screw rod 200 .

[0114] In another embodiment, the inner ring of the bearing of the first limiting member 220 is bonded and embedded in the outer wall of the screw rod 200 .

[0115] Alternatively, in other embodiments, 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.

[0116] 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 the first limiting member 220 is provided between the limiting ring 210 and the first seat body step 518.

[0117] 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 .

[0118] The provision of the first stopper 540 and the second stopper 550 effectively limits the travel of the stop ring 520 within the external threaded portion 511, thereby limiting the angular range of rotation 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, this arrangement effectively limits the angular range of rotation of the rotor assembly 100, thereby controlling the travel of the valve core assembly 300 relative to the valve opening 410, thereby preventing wear on the valve core assembly 300 and the valve opening 410 and reducing the impact force of the valve core assembly 300 on the valve opening 410 when the valve is closed. Furthermore, this arrangement prevents the stop ring 520 from moving beyond the external threaded portion 511, thereby affecting the threaded fit between the stop ring 520 and the stop seat 510.

[0119] Furthermore, in one embodiment, the stop seat 510 includes a stop body 512 and a first connecting insert 513 . The stop body 512 is an injection molded part. One end of the first connecting insert 513 is embedded in the stop body 512 and the other end is welded to the annular fixing ring 541 .

[0120] In another embodiment, an annular fixing ring 541 is provided on a side of the stop seat 510 away from the valve opening 410 , and the annular fixing ring 541 directly constitutes the second limiting member 230 .

[0121] Example 3

[0122] In one embodiment, as shown in Figure 4 , a first mating portion 5101 is fixedly disposed on the end of the stopper 510 away from the valve opening 410, and is adapted to mate with the screw rod 200 for movement and guidance. Specifically, the first mating portion 5101 and the stopper 510 are integrally formed, with the inner wall of the first mating portion 5101 mates with the outer wall of the screw rod 200 for movement and guidance. A second mating portion 5102 is fixedly disposed on the end of the stopper 510 closer to the valve opening 410, and is adapted to mate with the screw rod 200 for movement and restriction. The second mating portion 5102 and the stopper 510 are formed separately.

[0123] Thus, by providing the first matching portion 5101 , the coaxiality of the screw rod 200 and the stopper 510 is improved. Furthermore, the second matching portion 5102 and the stopper 510 are provided as separate parts, which is beneficial for assembling the screw rod 200 in the stopper 510 .

[0124] Furthermore, in one embodiment, the second matching portion 5102 stops at an end of the first limiting member 220 close to the valve opening 410 to prevent the first limiting member 220 from moving toward the valve opening 410. Furthermore, 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.

[0125] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0126] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. An electronic expansion valve, characterized in that: It 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 port; The electronic expansion valve also includes a first elastic member, one end of which is directly or indirectly connected to the stop seat, and the other end is directly or indirectly connected to the lead screw. When the lead screw 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 lead screw from the rotor assembly to the valve mouth.

2. The electronic expansion valve according to claim 1, wherein: The electronic expansion valve further includes a first limiter and a second limiter, one of the first limiter and the second limiter is fixedly connected to the stop seat, and the other is fixedly connected to the lead screw.

3. The electronic expansion valve according to claim 1, wherein: The first elastic member is a compression spring, and the first elastic member is sleeved on the outer side of the screw rod.

4. The electronic expansion valve according to claim 2, wherein: 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 end of the first elastic member away from the valve mouth abuts against the first limit member, and the end of the first elastic member close to the valve mouth abuts against the second limit member.

5. The electronic expansion valve according to claim 4, wherein: 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.

6. The electronic expansion valve according to claim 4, wherein: The inner wall of the stop seat is provided with a first seat body step, the side of the stop seat away from the valve mouth is provided with a first stop portion, and the first limiting member is arranged between the first stop portion and the first seat body step.

7. The electronic expansion valve according to claim 6, wherein: 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.

8. The electronic expansion valve according to claim 2, wherein: 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, one end of the first elastic member close to the valve mouth abuts against the first limit member, and one end of the first elastic member away from the valve mouth abuts against the second limit member.

9. The electronic expansion valve according to claim 8, wherein: It also includes a limiting ring, which is fixedly sleeved on the outer side of the screw rod and stopped at an end of the first limiting member away from the valve mouth; the inner wall of the stop seat is provided with a first seat body step, and the first limiting member is arranged between the limiting ring and the first seat body step.

10. The electronic expansion valve according to claim 8, wherein: A first stopper is disposed on a side of the stop seat away from the valve opening, and the first stopper constitutes the second limiting member.

11. The electronic expansion valve according to claim 10, wherein: 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.

12. The electronic expansion valve according to claim 1, wherein: It also includes a valve core assembly and a stop ring. The stop seat is also provided with a second stop portion. When the stop ring stops at the second stop portion, the valve core assembly abuts against the valve mouth and closes the valve mouth.

13. The electronic expansion valve according to claim 1, wherein: It also includes a valve core assembly, which includes a sliding nut and a valve needle assembly. The sliding nut includes a main body and a connecting part. 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 part is fixedly connected to the main body, and the other end is connected to the valve needle assembly.

14. The electronic expansion valve according to claim 1, wherein: The electronic expansion valve further comprises a stop structure, which is arranged 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 toward the valve mouth; one end of the first elastic member close to the valve mouth abuts against the screw rod, and one end of the first elastic member away from the valve mouth 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 toward the rotor assembly, the first elastic member in the compressed state can generate an elastic stopping force on the screw rod from the rotor assembly toward the valve mouth portion.

15. The electronic expansion valve according to claim 14, wherein: It also includes a limiting ring, which is fixedly sleeved on the outside of the screw rod, and the stopping structure includes a first limiting member, one end of the first limiting member is fixedly arranged on 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 limiting member stops at one end of the limiting ring close to the valve mouth part, one end of the first elastic member away from the valve mouth part stops at the first limiting member, and one end of the first elastic member close to the valve mouth part stops at the outer wall of the screw rod.

16. The electronic expansion valve according to claim 15, wherein: The stop structure further includes a first seat body step disposed on an 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.

17. The electronic expansion valve according to claim 15, wherein: 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.

18. The electronic expansion valve according to claim 15, wherein: The rotor assembly comprises 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 limiting collar is clamped between the first limiting member and the connecting member.

19. The electronic expansion valve according to claim 15, wherein: The first limiting member is a bearing member, and the outer ring of the bearing of the first limiting member is fixedly connected to the inner wall of the stop seat, the inner ring of the bearing of the first limiting member is movably sleeved on the outer wall of the screw rod, and the screw rod is guided and matched with the inner ring of the bearing of the first limiting member.

20. The electronic expansion valve according to claim 14, wherein: The outer wall fixing sleeve of the screw rod is provided with a first limit piece, and the stop structure includes a second seat body step provided on the inner wall of the stop seat, and the second seat body step stops at an end of the first limit piece close to the valve mouth part to prevent the screw rod from moving toward the valve mouth part, and the end of the stop seat away from the valve mouth part is provided with a first stop part, and the end of the first elastic part close to the valve mouth part stops at the first limit piece, and the end of the first elastic part away from the valve mouth part stops at the first stop part.

21. The electronic expansion valve according to claim 20, wherein: It also includes a limiting ring, which is fixedly sleeved on the outside of the screw rod. The outer wall of the screw rod is also provided with a third rod body step, and the first limiting member is fixedly clamped between the limiting ring and the third rod body step.

22. The electronic expansion valve according to claim 20, wherein: The first limiting member is a bearing member, and the inner ring of the bearing of the first limiting member is fixedly connected to the outer wall of the screw rod, and the outer ring of the bearing of the first limiting member is guided and matched with the inner wall of the stop seat.

23. The electronic expansion valve according to claim 1, wherein: The electronic expansion valve further comprises a first limit member, which is a bearing member. The outer ring of the bearing of the first limit member is limited to the inner wall of the stop seat, and the inner ring of the bearing of the first limit member is stopped at the outer wall of the screw rod to prevent the screw rod from moving toward the valve mouth. One end of the first elastic member close to the valve mouth abuts against the screw rod, and one end of the first elastic member away from the valve mouth abuts against the inner ring of the first limit member.

24. The electronic expansion valve according to claim 23, wherein: The stop seat is provided with a first stop portion at one end away from the valve opening, and the bearing outer ring of the first limiting member is embedded between the first stop portion and the stop seat.

25. The electronic expansion valve according to claim 24, wherein: The stop seat comprises a stop body and a first connecting insert, wherein the stop body is an injection molded part, one end of the first connecting insert is embedded in the stop body, and the other end is welded to the first stop portion.

26. The electronic expansion valve according to claim 24, wherein: The stop seat further comprises a second connecting insert, one end of which is embedded in the stop body and the other end is welded to the valve seat assembly.

27. The electronic expansion valve according to claim 1, wherein: The electronic expansion valve further comprises a first limiting member, which is a bearing member, and the inner ring of the bearing of the first limiting member is fixedly connected to the Connected to the outer wall of the screw rod, the outer ring of the bearing of the first limiting member stops at the inner wall of the stop seat to prevent the screw rod from moving toward the valve mouth, one end of the first elastic member close to the valve mouth abuts against the outer ring of the bearing of the first limiting member, and one end of the first elastic member away from the valve mouth directly or indirectly stops at the inner wall of the stop seat.

28. The electronic expansion valve according to claim 27 or 6, wherein: A first stopper is provided on one side of the stopper away from the valve opening, and the first stopper constitutes a second position limiting member; optionally, The first stopper comprises an annular fixing ring, the inner side of which is arranged around the circumference of the screw rod, and the outer ring of which is fixedly connected to the inner wall of the stop seat.

29. The electronic expansion valve according to claim 28, wherein: The stop seat comprises a stop body and a first connecting insert, wherein the stop body is an injection molded part, one end of the first connecting insert is embedded in the stop body, and the other end is welded to the annular fixing ring.

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