Electronic expansion valve

Abstract

The application relates to an electronic expansion valve, which comprises a stop seat, a rotor assembly, a screw rod, a valve seat assembly, a stop structure and a first elastic piece. The valve seat assembly is provided with a valve port part. The stop structure is arranged on the inner wall of the stop seat and can abut against the side part of the screw rod to prevent the screw rod from moving from the rotor assembly to the valve port part. One end of the first elastic piece close to the valve port part abuts against the screw rod, and the other end of the first elastic piece away from the valve port part abuts against the stop seat. The first elastic piece is in a compressed state, and when the screw rod moves from the valve port part to the rotor assembly, the first elastic piece in the compressed state can generate an elastic stop force on the screw rod from the rotor assembly to the valve port part. The electronic expansion valve provided by the application solves the problem that the screw rod is also prone to moving along the axial direction of the screw rod during rotation.

Description

Technical Field

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

[0002] As a new type of control element, the electronic expansion valve has long since broken through the concept of a throttling mechanism. It is an important link in the intelligence of refrigeration systems, an important means and guarantee for the true realization of refrigeration system optimization, and a symbol of the electromechanical integration of refrigeration systems. It has been applied in more and more fields.

[0003] Typically, the lead screw of an electronic expansion valve drives the valve core to move along the axial direction of the lead screw through its own rotation. However, due to the lack of effective limiting measures, the lead screw is also prone to moving along its own axial direction during rotation, which affects the operating accuracy of the electronic expansion valve. Summary of the Invention

[0004] Therefore, it is necessary to provide an electronic expansion valve to solve the problem that the lead screw is also prone to move along its own axis during rotation.

[0005] The electronic expansion valve provided in this application includes a stop seat, a rotor assembly, a lead screw, and a valve seat assembly, the valve seat assembly having a valve port. The electronic expansion valve also includes a stop structure and a first elastic member. The stop structure is located on the inner wall of the stop seat and can abut against the side of the lead screw to prevent the lead screw from moving from the rotor assembly towards the valve port. One end of the first elastic member near the valve port abuts against the lead screw, and the other end of the first elastic member away from the valve port abuts against the stop seat. The first elastic member is in a compressed state. When the lead screw moves from the valve port towards the rotor assembly, the compressed first elastic member can generate an elastic stopping force on the lead screw from the rotor assembly towards the valve port.

[0006] In one embodiment, the electronic expansion valve further includes a limiting collar, which is fixedly sleeved on the outside of the lead screw. The stop structure includes a first limiting member, one end of which is fixed to the inner wall of the stop seat, and the other end extends radially along the stop seat toward the lead screw. The first limiting member stops at the end of the limiting collar near the valve port, and the end of the first elastic member away from the valve port stops at the first limiting member. The end of the first elastic member near the valve port stops at the outer wall of the lead screw.

[0007] In one embodiment, the stop structure further includes a first seat step disposed on the inner wall of the stop seat, the first seat step stopping at one end of the first limiting member near the valve port.

[0008] In one embodiment, the first elastic element is a compression spring, and the first elastic element is sleeved on the outside of the lead screw.

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

[0010] In one embodiment, the outer wall of the lead screw 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 connector. The magnetic rotor is sleeved on the outside of the stop seat and fixedly connected to the end of the lead screw away from the valve port via the connector. The outer wall of the lead screw is also provided with a second rod step, and a limiting collar is engaged between the second rod step and the connector.

[0012] In one embodiment, 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, and the inner ring of the bearing of the first limiting member is movably sleeved on the outer wall of the lead screw, so that the lead screw can drive the inner ring of the bearing of the first limiting member to rotate synchronously, and the lead screw can guide and cooperate with the inner ring of the bearing of the first limiting member along its own axial direction.

[0013] In one embodiment, a first limiting member is fixedly sleeved on the outer wall of the lead screw, and the stop structure includes a second seat step disposed on the inner wall of the stop seat. The second seat step stops at the end of the first limiting member near the valve port to prevent the lead screw from moving toward the valve port. A first stop portion is provided at the end of the stop seat away from the valve port. The end of the first elastic member near the valve port stops at the first limiting member, and the end of the first elastic member away from the valve port stops at the first stop portion.

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

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

[0016] In one embodiment, 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 lead screw. The outer ring of the bearing of the first limiting member and the inner wall of the stop seat are guided and engaged so that the lead screw can drive the inner ring of the bearing of the first limiting member to rotate synchronously, and the lead screw can be guided and engaged with the inner ring of the bearing of the first limiting member along its own axial direction.

[0017] In one embodiment, the electronic expansion valve further 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 port and closes the valve port.

[0018] In one embodiment, the electronic expansion valve further includes a valve core assembly, which includes a sliding nut and a valve needle assembly. The sliding nut includes a body and a connecting part. The body is an injection molded part. The sliding nut cooperates with a stop seat or valve seat assembly through the body. One end of the connecting part is fixedly connected to the body and the other end is connected to the valve needle assembly.

[0019] Compared to existing technologies, the stop structure prevents the lead screw from moving from the rotor assembly towards the valve port. Furthermore, the first elastic element generates an elastic stop force on the lead screw from the rotor assembly towards the valve port. Therefore, under the bidirectional stop action of the stop structure and the first elastic element, the lead screw can only rotate relative to the stop seat and cannot move axially along the stop seat. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A partial structural schematic diagram of an electronic expansion valve according to an embodiment of this application;

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

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

[0024] Reference numerals: 100, rotor assembly; 110, magnetic rotor; 120, connector; 200, lead screw; 210, limiting collar; 220, first 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 part; 320, valve needle assembly; 400, valve seat assembly; 410, valve port; 510, stop seat; 511, external thread; 518, first seat step; 519, second seat step; 520, stop ring; 530, guide rod; 540, first stop part; 610, first elastic element; 800, housing. Detailed Implementation

[0025] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0026] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0027] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0028] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0029] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening 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 possible implementation.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] Please see Figures 1-3 In one embodiment, the electronic expansion valve includes a stop seat 510, a rotor assembly 100, a lead screw 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 is disposed on the outer periphery of the lead screw 200. The valve seat assembly 400 has a valve port 410. The valve core assembly 300 is movable relative to the valve seat assembly 400 along the axial direction of the lead screw 200. One end of the lead screw 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 port 410 via the lead screw 200.

[0032] The electronic expansion valve also includes a stop structure and a first elastic element 610. The stop structure is located on the inner wall of the stop seat 510 and can abut against the side of the lead screw 200 to prevent the lead screw 200 from moving from the rotor assembly 100 toward the valve port 410. The end of the first elastic element 610 near the valve port 410 abuts against the lead screw 200, and the end of the first elastic element 610 away from the valve port 410 abuts against the stop seat 510. The first elastic element 610 is in a compressed state. When the lead screw 200 moves from the valve port 410 toward the rotor assembly 100, the compressed first elastic element 610 can generate an elastic stop force on the lead screw 200 from the rotor assembly 100 toward the valve port 410.

[0033] Under the stopping action of the stop structure, the lead screw 200 is prevented from moving from the rotor assembly 100 toward the valve port 410. Furthermore, the first elastic element 610 generates an elastic stopping force on the lead screw 200 in the direction from the rotor assembly 100 toward the valve port 410. Therefore, under the bidirectional stopping action of the stop structure and the first elastic element 610, the lead screw 200 can only rotate relative to the stop seat 510 and cannot move axially along the stop seat 510.

[0034] Specifically, the lead screw 200 and the valve core assembly 300 are in a moving thread engagement.

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

[0036] It is important to note that the stop structure provides a hard constraint on the axial movement of the lead screw 200. This effectively ensures that the lead screw 200 cannot exceed the constraint of the stop structure. The first elastic element 610 provides a soft constraint on the axial movement of the lead screw 200. When the axial force on the lead screw 200 is sufficiently large, the lead screw 200 can, to some extent, exceed the constraint of the first elastic element 610. This configuration, with hard constraints at both ends and a soft constraint at the other, allows the lead screw 200 to offset excessive axial forces through limited axial displacement, preventing excessive wear and extending its service life.

[0037] In one embodiment, the valve core assembly 300 includes a sliding nut 310 and a valve needle assembly 320. The end of the lead screw 200 away from the rotor assembly 100 is threadedly engaged with the sliding nut 310. The sliding nut 310 and the stop seat 510 are engaged by a limiting structure so that the lead screw 200 can drive the sliding nut 310 to move the valve core assembly 300 relative to the stop seat 510 along the axial direction of the lead screw 200 to open or close the valve port 410. The limiting structure can prevent the sliding nut 310 from rotating relative to the stop seat 510 around the axis of the lead screw 200.

[0038] By setting a limiting structure, the sliding nut 310 can be prevented from rotating relative to the stop seat 510 around the axis of the lead screw 200. At this time, the sliding nut 310 can move relative to the lead screw 200 along the axial direction of the lead screw 200, so that the lead screw 200 can drive the sliding nut 310 to open or close the valve port 410 of the valve core assembly 300. This prevents relative rotation between the sliding nut 310 and the stop seat 510 from causing wear on the sliding nut 310 and the stop seat 510.

[0039] Furthermore, in one embodiment, the sliding nut 310 includes a main body 314 and a connecting part 315. The main body 314 is an injection molded part, and the connecting part 315 is a metal part. The sliding nut 310 is threadedly connected to the lead screw 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 part 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 significantly reduces the weight of the sliding nut 310 and simplifies its manufacturing process. The connecting part 315 is a metal part, which facilitates the welding of the valve needle assembly 320 to the sliding nut 310, thereby improving the connection strength between the sliding nut 310 and the valve needle assembly 320. Furthermore, this design allows the same sliding nut 310 to be matched with valve needle assemblies 320 of different specifications; that is, only one sliding nut 310 needs to be manufactured to accommodate valve needle assemblies 320 of different specifications.

[0041] Example 1

[0042] The electronic expansion valve also 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 fixed to the inner wall of the stop seat 510, and the other end extends radially along the stop seat 510 toward the lead screw 200. The first limiting member 220 stops at the end of the limiting collar 210 near the valve port 410. The end of the first elastic member 610 away from the valve port 410 stops at the first limiting member 220, and the end of the first elastic member 610 near the valve port 410 stops 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 has an external thread 511 on its outer periphery away from the lead screw 200. The stop ring 520 is sleeved on the outer periphery of the stop seat 510 and is in active thread engagement with the external thread 511. The guide rod 530 is fixedly connected to the rotor assembly 100 or the lead screw 200 so that the rotor assembly 100 can drive the guide rod 530 to push the stop ring 520 to move helically along the external thread 511.

[0044] Since the first limiting member 220 stops at the end of the limiting collar 210 near the valve port 410, and one end of the first limiting member 220 is fixed to the inner wall of the stop seat 510, the stopping action of the first limiting member 220 can prevent the lead screw 200 from moving along its own axis toward the valve port 410. Furthermore, since the end of the first elastic member 610 near the valve port 410 stops at the outer wall of the lead screw 200, and the end of the first elastic member 610 away from the valve port 410 stops at the first limiting member 220, and the first elastic member 610 is a compression elastic member, that is, the lead screw 200, under the thrust of the first elastic member 610, has a tendency to move toward the valve port 410. Therefore, under the thrust of the first elastic member 610, the lead screw 200 can be prevented from moving along its own axis toward the direction away from the valve port 410.

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

[0046] In one embodiment, the first elastic element 610 is a compression spring, and the first elastic element 610 is sleeved on the outside of the lead screw 200.

[0047] This significantly reduces the machining difficulty of the first elastic element 610 and the assembly difficulty of the first elastic element 610 and the lead screw 200.

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

[0049] In this way, the coaxiality of the first elastic element 610 and the lead screw 200 can be ensured, and the first elastic element 610 can be prevented from becoming eccentric.

[0050] However, this is not the only embodiment. In other embodiments, the inner ring of the first elastic member 610 and the outer wall of the lead screw 200 may be spaced apart.

[0051] This avoids scratching between the first elastic element 610 and the outer wall of the lead screw 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 lead screw 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.

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

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

[0055] Furthermore, in one embodiment, the outer wall of the lead screw 200 is also provided with a second rod step 250, and the limiting collar 210 is engaged between the second rod step 250 and the connector 120.

[0056] This effectively improves the connection strength between the limiting collar 210 and the lead screw 200, preventing the limiting collar 210 from moving along the axial direction of the lead screw 200.

[0057] It should be noted that the thickness of the limiting collar 210 along its own radial direction is greater than the depth of the second rod step 250 along the radial direction of the lead screw 200. This ensures that the limiting collar 210 can protrude from the surface of the lead screw 200 along the radial direction, which is beneficial to the contact between the first limiting member 220 and the limiting collar 210.

[0058] To further improve the connection strength between the limiting collar 210 and the lead screw 200, in one embodiment, the limiting collar 210 is welded, bonded, or threaded to the outer wall of the lead screw 200.

[0059] In one embodiment, 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 lead screw 200 so that the lead screw 200 can drive the inner ring of the bearing of the first limiting member 220 to rotate synchronously, and the lead screw 200 can guide and cooperate with the inner ring of the bearing of the first limiting member 220 along its own axial direction.

[0060] It is understandable that bearing components are a relatively special type of shaft connection component. When the first limiting component 220 is a bearing component, the lead screw 200 can drive the inner ring of the bearing in the first limiting component 220 to rotate synchronously. In this way, the stop seat 510 can provide a limiting effect on the lead screw 200 through the first bearing component, so as to ensure the coaxiality of the lead screw 200 and the stop seat 510 and prevent the lead screw 200 from becoming eccentric. Furthermore, by setting the first limiting component 220 to a bearing component, sliding friction between the lead screw 200 and the stop seat 510 is effectively prevented.

[0061] Furthermore, in this embodiment, the inner ring of the bearing of the first limiting member 220 is not completely fixed to the outer wall of the lead screw 200. Specifically, the lead screw 200 can move axially relative to the inner ring of the bearing of the first limiting member 220. That is, there is a certain friction between the lead screw 200 and the inner ring of the bearing of the first limiting member 220. This friction can drive the inner ring of the bearing of the first limiting member 220 to rotate synchronously. However, when the lead screw 200 needs to overcome the elastic force of the first elastic member 610 to move axially, the first limiting member 220 will not restrict the movement of the lead screw 200. Specifically, when the valve core assembly 300 blocks the valve port 410, if the lead screw 200 continues to rotate, the valve core assembly 300 will not continue to move. At this time, the lead screw 200 can compress the first elastic member 610 in a direction away from the valve port 410, and separate the limiting collar 210 from the first limiting member 220.

[0062] Furthermore, in one embodiment, the end of the first elastic member 610 away from the valve port 410 abuts against the bearing inner ring of the first limiting member 220.

[0063] In this way, the bearing inner rings of the first elastic element 610 and the first limiting element 220, the lead screw 200 and the rotor assembly 100 can rotate synchronously, and there will be no sliding friction between the bearing inner rings of the first elastic element 610 and the first limiting element 220, thereby reducing the wear between the lead screw 200, the first elastic element 610 and the first limiting element 220, and improving the service life of the electronic expansion valve.

[0064] In one embodiment, the first limiting member 220 is a metal part, and the bearing outer ring and the stop seat 510 of the first limiting member 220 can be welded, bonded or threaded.

[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 setting the first stop portion 540 and the second stop portion, the movement stroke of the stop ring 520 in the external thread 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 lead screw 200, this setting can effectively limit the rotation angle range of the rotor assembly 100, thereby controlling the movement stroke of the valve core assembly 300 relative to the valve port portion 410, avoiding wear between the valve core assembly 300 and the valve port portion 410, and reducing the impact force of the valve core assembly 300 on the valve port portion 410 when the valve is closed. Furthermore, this setting can also prevent the stop ring 520 from moving to an area outside the external thread portion 511, thus affecting the threaded engagement between the stop ring 520 and the stop seat 510. Embodiment 2

[0068] The outer wall of the lead screw 200 is fixedly fitted with a first limiting member 220. The stop structure includes a second seat step 519 provided on the inner wall of the stop seat 510. The second seat step 519 stops at the end of the first limiting member 220 near the valve port 410 to prevent the lead screw 200 from moving toward the valve port 410. The end of the stop seat 510 away from the valve port 410 is provided with a first stop portion 540. The end of the first elastic member 610 near the valve port 410 stops at the first limiting member 220, and the end of the first elastic member 610 away from the valve port 410 stops at the first stop portion 540.

[0069] At this time, the lead screw 200 and the first limiting member 220 move synchronously, and the cooperation between the first limiting member 220 and the second seat step 519 prevents the lead screw 200 from moving toward the valve port 410. Furthermore, when the first elastic member 610 is compressed, it applies an elastic blocking force from the rotor assembly 100 toward the valve port 410 to the first limiting member 220, thereby preventing the lead screw 200 from moving away from the valve port 410.

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

[0071] In this way, the coaxiality of the first elastic element 610 and the stop seat 510 can be ensured, and the first elastic element 610 can be prevented from becoming eccentric.

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

[0073] This prevents the first elastic element 610 from scratching the inner wall of the stop seat 510 during the extension and retraction process.

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

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

[0076] In one 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 lead screw 200. The outer ring of the bearing of the first limiting member 220 and the inner wall of the stop seat 510 are guided and engaged so that the lead screw 200 can drive the inner ring of the bearing of the first limiting member 220 to rotate synchronously, and the lead screw 200 can be guided and engaged with the inner ring of the bearing of the first limiting member 220 along its own axial direction.

[0077] This configuration effectively ensures the coaxiality of the lead screw 200 and the stop seat 510, and allows the outer ring of the bearing of the first limiting member 220 to remain stationary together with the stop seat 510. This converts the sliding friction between the lead screw 200 and the stop seat 510 into rolling friction within the first limiting member 220, reducing the friction and wear between the lead screw 200 and the stop seat 510, and improving the service life of the electronic expansion valve.

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

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

[0080] In one embodiment, the first limiting member 220 is a metal part, and the bearing inner ring of the first limiting member 220 and the lead screw 200 can be welded, bonded or threaded.

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

[0082] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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 embodiments described above are merely illustrative of several implementation methods of this application, and 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 those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. An electronic expansion valve, characterized in that, It includes 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 (410). The electronic expansion valve further includes a stop structure and a first elastic element (610). The stop structure is disposed on the inner wall of the stop seat (510) and can abut against the side of the lead screw (200) to prevent the lead screw (200) from moving from the rotor assembly (100) toward the valve port (410). The end of the first elastic element (610) near the valve port (410) abuts against the lead screw (200), and the end of the first elastic element (610) away from the valve port (410) abuts against the stop seat (510). The first elastic element (610) is in a compressed state. When the lead screw (200) moves from the valve port (410) toward the rotor assembly (100), the compressed first elastic element (610) can generate an elastic stop force on the lead screw (200) from the rotor assembly (100) toward the valve port (410). The electronic expansion valve further includes a valve core assembly (300) and a housing (800). The lead screw (200) and the valve core assembly (300) are in a movable threaded engagement. The valve core assembly (300) can move relative to the valve seat assembly (400) along the axial direction of the lead screw (200). One end of the lead screw (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 port (410) via the lead screw (200). The housing (800) covers the outside of the rotor assembly (100), part of the lead screw (200) and part of the valve core assembly (300), and is welded to the valve seat assembly (400).

2. The electronic expansion valve according to claim 1, characterized in that, It also 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 fixed to the inner wall of the stop seat (510), and the other end extends along the radial direction of the stop seat (510) toward the lead screw (200). The first limiting member (220) stops at the end of the limiting collar (210) near the valve port (410). The end of the first elastic member (610) away from the valve port (410) stops at the first limiting member (220), and the end of the first elastic member (610) near the valve port (410) stops at the outer wall of the lead screw (200).

3. The electronic expansion valve according to claim 2, characterized in that, The stop structure also includes a first seat step (518) provided on the inner wall of the stop seat (510), the first seat step (518) stopping at one end of the first limiting member (220) near the valve port (410); And / or, the first elastic element (610) is a compression spring, and the first elastic element (610) is sleeved on the outside of the lead screw (200); And / or, the inner ring of the first elastic element (610) is attached to the outer wall of the lead screw (200).

4. The electronic expansion valve according to claim 2, characterized in that, The outer wall of the lead screw (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) includes a magnetic rotor (110) and a connector (120). The magnetic rotor (110) is sleeved on the outside of the stop seat (510) and is fixedly connected to the end of the lead screw (200) away from the valve port (410) through the connector (120). The outer wall of the lead screw (200) is also provided with a second rod body step (250), and the limiting collar (210) is engaged between the second rod body step (250) and the connector (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). The inner ring of the bearing of the first limiting member (220) is movably sleeved on the outer wall of the lead screw (200) so that the lead screw (200) can drive the inner ring of the bearing of the first limiting member (220) to rotate synchronously, and the lead screw (200) can guide and cooperate with the inner ring of the bearing of the first limiting member (220) along its own axial direction.

7. The electronic expansion valve according to claim 1, characterized in that, The outer wall of the lead screw (200) is fixedly fitted with a first limiting member (220). The stop structure includes a second seat step (519) provided on the inner wall of the stop seat (510). The second seat step (519) stops at the end of the first limiting member (220) near the valve port (410) to prevent the lead screw (200) from moving toward the valve port (410). The end of the stop seat (510) away from the valve port (410) is provided with a first stop part (540). The end of the first elastic member (610) near the valve port (410) stops at the first limiting member (220), and the end of the first elastic member (610) away from the valve port (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 element (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 collar (210), which is fixedly sleeved on the outside of the lead screw (200). The outer wall of the lead screw (200) is also provided with a third rod body step (260). The first limiting member (220) is fixedly clamped between the limiting collar (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 lead screw (200). The outer ring of the bearing of the first limiting member (220) and the inner wall of the stop seat (510) are guided and engaged so that the lead screw (200) can drive the inner ring of the bearing of the first limiting member (220) to rotate synchronously, and the lead screw (200) can be guided and engaged 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 stop ring (520), and the stop seat (510) is further 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 port portion (410) and closes the valve port portion (410).

12. The electronic expansion valve according to claim 1, characterized in that, 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 part (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 part (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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