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 first limiting piece, a second limiting piece and a first elastic piece. The valve seat assembly is provided with a valve port part. One of the first limiting piece and the second limiting piece is fixedly connected to the stop seat, and the other is fixedly connected to the screw rod. One end of the first elastic piece is connected to the first limiting piece, and the other end is connected to the second limiting piece. When the screw rod moves in the direction from the valve port part to the rotor assembly, the first elastic piece can generate an elastic pre-tightening force on the screw rod in the direction from the rotor assembly to the valve port part. The electronic expansion valve provided by the application solves the problem that the valve core and the valve port part are prone to loosening, thereby causing the electronic expansion valve to leak.

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] When the valve core abuts against the valve port, the electronic expansion valve is in the closed state. At this time, if the valve core does not have enough preload to close the valve port, it cannot guarantee a good seal between the valve core and the valve port, resulting in leakage 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 valve core and valve port are prone to loosening, which leads to leakage in the electronic expansion valve.

[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 first limiting member, a second limiting member, and a first elastic member. One of the first and second limiting members is fixedly connected to the stop seat, and the other is fixedly connected to the lead screw. One end of the first elastic member is connected to the first limiting member, and the other end is connected to the second limiting member. When the lead screw moves along the direction from the valve port to the rotor assembly, the first elastic member can generate an elastic preload force on the lead screw from the rotor assembly towards the valve port.

[0006] 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.

[0007] In one embodiment, the first limiting member is fixedly connected to the inner wall of the stop seat, the second limiting member is fixedly connected to the outer wall of the lead screw, and the first limiting member is located at the end of the first elastic member away from the valve port, and the second limiting member is located at the end of the first elastic member close to the valve port.

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

[0009] In one embodiment, the inner wall of the stop seat is provided with a first seat step, the side of the stop seat away from the valve port is provided with a first stop part, and the first limiting member is provided between the first stop part and the first seat step.

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

[0011] In one embodiment, the first limiting member is fixedly connected to the outer wall of the lead screw, the second limiting member is fixedly connected to the inner wall of the stop seat, and the first limiting member is located at the end of the first elastic member near the valve port, while the second limiting member is located at the end of the first elastic member away from the valve port.

[0012] In one embodiment, the electronic expansion valve further includes a limiting collar, which is fixedly sleeved on the outside of the lead screw. The inner wall of the stop seat is provided with a first seat step, and a first limiting member is disposed between the limiting collar and the first seat step.

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

[0014] In one embodiment, the top of the stop seat is provided with a first connecting insert, and the first stop portion is connected to the first connecting insert.

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

[0016] In one embodiment, the electronic expansion valve further includes a valve core assembly and a stop ring. 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.

[0017] 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.

[0018] Compared to existing technologies, in normal operation, the stop seat supports the lead screw and rotor assembly, and the lead screw rotates in place with the rotor assembly without moving axially. When the lead screw drives the valve core assembly to close the valve port, continued rotation of the rotor assembly causes the lead screw to continue rotating relative to the valve core assembly. However, since the valve core assembly is already in contact with the valve port, it cannot continue to move towards the valve port. At this point, under the push of the reaction force, the lead screw moves away from the valve port. Due to the limiting effect of the first and second limiting members, a first elastic element, which is a compression elastic element, is engaged between the lead screw and the stop seat. Therefore, as the lead screw moves away from the valve port, it continues to compress the first elastic element. In turn, the first elastic element applies a force towards the valve port to the lead screw, thereby increasing the pressure of the valve core assembly on the valve port, achieving a pre-tightening effect on the valve port, and preventing leakage between the valve core assembly and the valve port. Attached Figure Description

[0019] 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.

[0020] Figure 1 A partial structural schematic diagram of an electronic expansion valve according to an embodiment of this application;

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

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

[0023] Figure 4 A cross-sectional view of an electronic expansion valve according to yet another embodiment provided in this application;

[0024] Figure 5 A partial structural schematic diagram of an electronic expansion valve according to an embodiment of this application.

[0025] Reference numerals: 100, rotor assembly; 200, lead screw; 210, limiting collar; 220, first limiting member; 230, second limiting member; 240, first rod body step; 300, valve core assembly; 310, sliding nut; 314, main body; 315, connecting part; 320, valve needle assembly; 321, first valve needle; 322, second valve needle; 3221, regulating valve port; 400, valve seat assembly; 410. Valve port; 510. Stop seat; 511. External thread; 5101. First mating part; 5102. Second mating part; 513. First connecting insert; 518. First seat step; 520. Stop ring; 530. Guide rod; 540. First stop part; 541. Annular fixing ring; 542. Stop protrusion; 550. Second stop part; 610. First elastic element; 800. Housing. Detailed Implementation

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] Please see Figures 1-5 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.

[0033] The electronic expansion valve also includes a first limiting member 220, a second limiting member 230, and a first elastic member 610. One of the first limiting member 220 and the second limiting member 230 is fixedly connected to the stop seat 510, and the other is fixedly connected to the lead screw 200. One end of the first elastic member 610 is connected to the first limiting member 220, and the other end is connected to the second limiting member 230. When the lead screw 200 moves along the direction from the valve port 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 port 410.

[0034] Specifically, the electronic expansion valve also includes a stop ring 520 and a guide rod 530. The stop seat 510 has an outer guide rail portion on its outer periphery opposite to the lead screw 200. The stop ring 520 is sleeved on the outer periphery of the stop seat 510 and movably engages with the outer guide rail portion. Specifically, the stop seat 510 has an external thread portion 511 on its outer periphery opposite to the lead screw 200. The stop ring 520 is sleeved on the outer periphery of the stop seat 510 and movably threadedly engages with the external thread portion 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 helically move along the external thread portion 511. Furthermore, the lead screw 200 and the valve core assembly 300 are movably threadedly engaged.

[0035] When the lead screw 200 is working normally, the stop seat 510 supports the lead screw 200 and the rotor assembly 100. The lead screw 200 rotates in place with the rotor assembly 100, but does not move axially. When the lead screw 200 drives the valve core assembly 300 to close the valve port 410, if the rotor assembly 100 continues to rotate, the lead screw 200 continues to rotate relative to the valve core assembly 300. However, since the valve core assembly 300 is already in contact with the valve port 410, the valve core assembly 300 cannot continue to move toward the valve port 410. At this time, under the push of the reaction force, the lead screw 200 moves away from the valve port 410. Furthermore, due to the limiting effect of the first limiting member 220 and the second limiting member 230, a first elastic member 610 is engaged between the lead screw 200 and the stop seat 510. The first elastic member 610 is a compression elastic member. Therefore, as the lead screw 200 moves away from the valve port 410, it will continue to compress the first elastic element 610. At this time, the first elastic element 610 will in turn exert a force on the lead screw 200 toward the valve port 410, thereby increasing the squeezing force of the valve core assembly 300 on the valve port 410, achieving a pre-tightening effect on the valve port 410, and preventing loosening and leakage between the valve core assembly 300 and the valve port 410.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] Example 1

[0044] In this embodiment, the first limiting member 220 is fixedly connected to the inner wall of the stop seat 510, and the second limiting member 230 is fixedly connected to the outer wall of the lead screw 200. The first limiting member 220 is located at the end of the first elastic member 610 away from the valve port 410, and the second limiting member 230 is located at the end of the first elastic member 610 close to the valve port 410.

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

[0046] This simplifies the assembly of the second limiting member 230 and the lead screw 200, and improves the connection between the second limiting member 230 and the lead screw 200.

[0047] In this 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. 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 move relative to the inner ring of the bearing of the first limiting member 220 along its own axial direction.

[0048] 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 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.

[0049] Furthermore, in this embodiment, the inner ring of the bearing of the first limiting member 220 is not 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 is rotated further, 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, 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.

[0050] The valve core assembly 300 includes a sliding nut 310, a first valve needle 321, and a second valve needle 322 connected to each other. The end of the lead screw 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 slidably engaged 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 via the first valve needle 321 and the second valve needle 322. The second valve needle 322 has an adjusting valve port 3221 that communicates with the valve port 410. The end of the lead screw 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 engaged by a limiting structure. The stop seat 510 is fixedly connected to the valve seat assembly 400.

[0051] When the first valve needle 321 strikes the regulating valve port 3221 or the second valve needle 322 strikes the valve port 410, a certain impact force is generated. This impact force is reduced by the sliding nut 310 and the stop seat 510 before being transmitted to the first limiting member 220, thus preventing damage to the first limiting member 220. Therefore, the sliding nut 310 and the stop seat 510 reduce the magnitude of the impact force transmitted to the first limiting member 220.

[0052] Furthermore, in this 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.

[0053] 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.

[0054] In this embodiment, the bearing outer ring of the first limiting member 220 is embedded in the inner wall of the stop seat 510. Specifically, the bearing outer ring of the first limiting member 220 is embedded in the stop seat 510 by integral injection molding.

[0055] Alternatively, in other embodiments, the first limiting member 220 is a metal part, and the bearing outer ring and the stop seat 510 of the first limiting member 220 can be welded, bonded or threaded.

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

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

[0058] Example 2

[0059] In this embodiment, the first limiting member 220 is fixedly connected to the outer wall of the lead screw 200, and the second limiting member 230 is fixedly connected to the inner wall of the stop seat 510. The first limiting member 220 is located at the end of the first elastic member 610 near the valve port 410, and the second limiting member 230 is located at the end of the first elastic member 610 away from the valve port 410.

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

[0061] The first stop part 540 can simultaneously stop the stop ring 520 and form the second limiting member 230. In this way, the first stop part 540 can simultaneously perform the functions of stopping the stop ring 520 and the first elastic member 610, which simplifies the structure of the electronic expansion valve and improves the structural integration of the electronic expansion valve.

[0062] Specifically, in this embodiment, the first stop portion 540 includes an annular fixing ring 541 and a stop protrusion 542. The inner side of the annular fixing ring 541 surrounds the periphery of the lead screw 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 protrusion 542. One end of the stop protrusion 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 surface of the stop seat 510.

[0063] 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 lead screw 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 lead screw 200 can drive the outer ring of the bearing of the first limiting member 220 to move relative to the stop seat 510 along its own axial direction, and the inner wall of the stop seat 510 can restrict the rotation of the outer ring of the bearing of the first limiting member 220.

[0064] 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 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.

[0065] Furthermore, in this embodiment, the outer ring of the bearing of the first limiting member 220 is not fixed to the inner wall of the stop seat 510. Specifically, the lead screw 200 can drive the outer ring of the bearing of the first limiting member 220 to move axially relative to the stop seat 510. 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. More specifically, when the valve core assembly 300 blocks the valve port 410, if the lead screw 200 is rotated further, 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, 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.

[0066] Furthermore, in this embodiment, one end of the first elastic member 610 near the valve port 410 abuts against the outer ring of the bearing of the first limiting member 220.

[0067] In this way, the bearing outer rings of the first elastic element 610 and the first limiting element 220, as well as the stop seat 510, will not rotate synchronously with the lead screw 200. 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.

[0068] In this 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.

[0069] Alternatively, in other embodiments, 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.

[0070] In this embodiment, the electronic expansion valve also includes a limiting collar 210, which is fixedly sleeved on the outside of the lead screw 200. The inner wall of the stop seat 510 is provided with a first seat step 518, and the first limiting member 220 is disposed between the limiting collar 210 and the first seat step 518.

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

[0072] By providing the first stop portion 540 and the second stop portion 550, the travel 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 arrangement can effectively limit the rotation angle range of the rotor assembly 100, thereby controlling the travel of the valve core assembly 300 relative to the valve port portion 410, preventing 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 arrangement 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.

[0073] Example 3

[0074] In one embodiment, such as Figure 4 As shown, the stop seat 510 has a first mating part 5101 fixed at one end away from the valve port 410, which is in a movable guiding engagement with the lead screw 200. Specifically, the first mating part 5101 and the stop seat 510 are integrally formed, and the inner wall of the first mating part 5101 is in a movable guiding engagement with the outer wall of the lead screw 200. The stop seat 510 has a second mating part 5102 fixed at one end near the valve port 410, which is in a movable limiting engagement with the lead screw 200, and the second mating part 5102 and the stop seat 510 are separately formed.

[0075] Thus, by providing the first mating part 5101, the coaxiality of the lead screw 200 and the stop seat 510 is improved. Furthermore, since the second mating part 5102 and the stop seat 510 are separately provided, it is beneficial for the assembly of the lead screw 200 within the stop seat 510.

[0076] Furthermore, in one embodiment, the second mating portion 5102 stops the first limiting member 220 near the valve port portion 410 to prevent the first limiting member 220 from moving toward the valve port portion 410. Additionally, one end of the first elastic member 610 abuts against the first mating portion 5101, and the other end abuts against the first limiting member 220.

[0077] 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.

[0078] 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 by, The valve seat assembly (400) is provided with a valve port (410); The electronic expansion valve further comprises a first limiting piece (220), a second limiting piece (230) and a first elastic piece (610), one of the first limiting piece (220) and the second limiting piece (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 piece (610) is connected to the first limiting piece (220), and the other end is connected to the second limiting piece (230). The electronic expansion valve further comprises a valve core assembly (300), the valve core assembly (300) comprises a sliding nut (310) and a valve needle assembly (320), when the screw rod (200) drives the valve core assembly (300) to close the valve port (410), continuing to rotate the rotor assembly (100), the screw rod (200) can continue to rotate relative to the valve core assembly (300), because the valve core assembly (300) has abutted on the valve port (410), the valve core assembly (300) cannot continue to move towards the valve port (410), at this time, under the pushing of the reaction force, the screw rod (200) moves away from the valve port (410), when the screw rod (200) moves along the direction from the valve port (410) to the rotor assembly (100), the first elastic piece (610) can generate elastic pre-tightening force of the rotor assembly (100) to the valve port (410) to the screw rod (200); The first elastic piece (610) is a compression spring, and the first elastic piece (610) is sleeved on the outer side of the screw rod (200); The first limiting piece (220) is a bearing piece.

2. The electronic expansion valve according to claim 1, characterized in that The first limiting piece (220) is fixedly connected to the inner wall of the stop seat (510), the second limiting piece (230) is fixedly connected to the outer wall of the screw rod (200), and the first limiting piece (220) is arranged at one end of the first elastic piece (610) away from the valve port (410), and the second limiting piece (230) is arranged at one end of the first elastic piece (610) close to the valve port (410).

3. The electronic expansion valve according to claim 2, characterized in that The outer wall of the screw rod (200) is provided with a first rod body step (240), and the first rod body step (240) constitutes the second limiting piece (230).

4. The electronic expansion valve according to claim 2, wherein The inner wall of the stop seat (510) is provided with a first seat body step (518), one side of the stop seat (510) away from the valve port (410) is provided with a first stop portion (540), and the first limiting piece (220) is arranged between the first stop portion (540) and the first seat body step (518).

5. The electronic expansion valve according to claim 4, wherein The top of the stop seat (510) is provided with a first connecting insert (513), and the first stop portion (540) is connected with the first connecting insert (513).

6. The electronic expansion valve according to claim 1, wherein The first limiting piece (220) is fixedly connected to the outer wall of the lead screw (200), the second limiting piece (230) is fixedly connected to the inner wall of the stop seat (510), and the first limiting piece (220) is arranged at one end of the first elastic piece (610) close to the valve port (410), and the second limiting piece (230) is arranged at one end of the first elastic piece (610) away from the valve port (410).

7. The electronic expansion valve according to claim 6, characterized in that Further comprising a limiting sleeve ring (210), the limiting sleeve ring (210) is fixedly sleeved on the outer side of the lead screw (200), the inner wall of the stop seat (510) is provided with a first seat step (518), and the first limiting piece (220) is arranged between the limiting sleeve ring (210) and the first seat step (518).

8. The electronic expansion valve according to claim 6, wherein The side of the stop seat (510) away from the valve port (410) is provided with a first stop portion (540), and the first stop portion (540) constitutes the second limiting piece (230).

9. The electronic expansion valve according to claim 8, characterized in that The top of the stop seat (510) is provided with a first connecting insert (513), and the first stop portion (540) is connected with the first connecting insert (513).

10. The electronic expansion valve according to claim 1, wherein Further comprising a valve core assembly (300) and a stop ring (520), the stop seat (510) is further provided with a second stop portion (550), when the stop ring (520) is stopped at the second stop portion (550), the valve core assembly (300) abuts against the valve port (410) and closes the valve port (410).

11. The electronic expansion valve according to claim 1, wherein The sliding nut (310) comprises a main body portion (314) and a connecting portion (315), the main body portion (314) is an injection molding part, the sliding nut (310) is matched with the stop seat (510) or the valve seat assembly (400) through the main body portion (314), and one end of the connecting portion (315) is fixedly connected to the main body portion (314), and the other end is connected to the valve needle assembly (320).

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