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 core assembly and a valve seat assembly provided with a valve port part. The valve core assembly comprises a sliding nut and a valve needle assembly. The screw rod is in threaded connection with the sliding nut at the end away from the rotor assembly. The screw rod can drive the sliding nut to move the valve core assembly along the axial direction of the screw rod relative to the stop seat, so as to open or close the valve port part. The sliding nut is fixedly provided with a first magnetic attraction assembly on the circumferential side. The stop seat is fixedly provided with a second magnetic attraction assembly extending along the axial direction of the stop seat at the corresponding position of the first magnetic attraction assembly. The corresponding positions of the first magnetic attraction assembly and the second magnetic attraction assembly can be attracted to each other or repel each other, so as to prevent the sliding nut from rotating relative to the stop seat around the axis of the screw rod. The electronic expansion valve provided by the application solves the problem of high wear degree between the valve core and the valve seat.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valve body, in particular to an electronic expansion valve. BACKGROUND

[0002] In the existing electronic expansion valve, the rotor is driven to move by a coil, the rotor is fixedly connected with a screw rod, and the rotor rotates while driving the screw rod to move up and down along the axial direction of the valve. When the rotor is far away from the coil, the coil still needs to provide sufficient driving force, and therefore the volume of the coil needs to be large enough. The large volume of the coil increases the overall volume of the valve, and increases the manufacturing cost.

[0003] How to reduce the overall volume of the valve is the main technical problem to be solved by the present application. SUMMARY

[0004] Therefore, it is necessary to provide an electronic expansion valve to solve the problem of high wear degree between the valve core and the valve seat.

[0005] The electronic expansion valve provided by the present application comprises a stop seat, a rotor assembly, a screw rod, a valve core assembly and a valve seat assembly, the valve seat assembly is provided with a valve port portion. The valve core assembly comprises a sliding nut and a valve needle assembly, one end of the screw rod away from the rotor assembly is threadedly connected with the sliding nut, and the screw rod can drive the sliding nut to drive the valve core assembly to move along the axial direction of the screw rod relative to the stop seat, so as to open or close the valve port portion. The sliding nut is fixedly provided with a first magnetic attraction assembly on the circumferential side, and the stop seat or the valve seat assembly is fixedly provided with a second magnetic attraction assembly extending along the axial direction of the stop seat or the valve seat assembly. The corresponding positions of the first magnetic attraction assembly and the second magnetic attraction assembly can be attracted to each other or repelled from each other, so as to prevent the sliding nut from rotating relative to the stop seat around the axis of the electronic expansion valve.

[0006] In one of the embodiments, the first magnetic attraction assembly is embedded in the sliding nut, and the second magnetic attraction assembly is embedded in the stop seat or the valve seat assembly.

[0007] In one of the embodiments, the first magnetic attraction assembly comprises a plurality of first magnetic blocks distributed circumferentially along the sliding nut, the S pole and the N pole of the first magnetic block are distributed along the radial direction of the sliding nut, and the magnetic pole distribution modes of adjacent first magnetic blocks are opposite; the second magnetic attraction assembly comprises a plurality of second magnetic blocks, the plurality of second magnetic blocks are distributed circumferentially along the stop seat or the valve seat assembly, the S pole and the N pole of the second magnetic block are distributed along the radial direction of the stop seat or the valve seat assembly, and the magnetic pole distribution modes of adjacent second magnetic blocks are opposite; the first magnetic blocks and the second magnetic blocks are arranged one by one in a one-to-one correspondence, and the first magnetic blocks attract the corresponding second magnetic blocks.

[0008] In one of the embodiments, the first magnetic assembly includes a plurality of first magnetic blocks distributed along the circumference of the sliding nut, the S poles and the N poles of the first magnetic blocks are distributed along the radial direction of the sliding nut, and the magnetic pole distribution of each first magnetic block is the same; the second magnetic assembly includes a plurality of second magnetic blocks, the plurality of second magnetic blocks are distributed along the circumference of the stop seat or the valve seat assembly, the S poles and the N poles of the second magnetic blocks are distributed along the radial direction of the stop seat or the valve seat assembly, and the magnetic pole distribution of each second magnetic block is the same; the first magnetic blocks and the second magnetic blocks are arranged one by one in correspondence, and the first magnetic blocks attract the corresponding second magnetic blocks.

[0009] In one of the embodiments, the first magnetic assembly includes a plurality of first magnetic blocks distributed along the circumference of the sliding nut, the S poles and the N poles of the first magnetic blocks are distributed along the radial direction of the sliding nut, and the magnetic pole distribution of each first magnetic block is the same; the second magnetic assembly includes a plurality of second magnetic blocks, the plurality of second magnetic blocks are distributed along the circumference of the stop seat or the valve seat assembly, the S poles and the N poles of the second magnetic blocks are distributed along the radial direction of the stop seat or the valve seat assembly, and the magnetic pole distribution of each second magnetic block is the same; the first magnetic blocks and the second magnetic blocks are arranged in a staggered manner along the circumference of the sliding nut, each first magnetic block is located between two adjacent second magnetic blocks in correspondence, and the first magnetic blocks are repelled by the two second magnetic blocks respectively.

[0010] In one of the embodiments, the first magnetic assembly includes a plurality of first magnetic blocks distributed along the circumference of the sliding nut, the S poles and the N poles of the first magnetic blocks are distributed along the radial direction of the sliding nut, and the magnetic pole distribution of each first magnetic block is the same; the second magnetic assembly includes a plurality of second magnetic blocks, the plurality of second magnetic blocks are distributed along the circumference of the stop seat or the valve seat assembly, the S poles and the N poles of the second magnetic blocks are distributed along the radial direction of the stop seat or the valve seat assembly, and the magnetic pole distribution of each second magnetic block is the same; the first magnetic blocks and the second magnetic blocks are arranged one by one in correspondence, and the first magnetic blocks attract the corresponding second magnetic blocks.

[0011] In one embodiment, the first magnetic attraction assembly includes a plurality of first magnetic blocks distributed circumferentially along the sliding nut, wherein the S and N poles of the first magnetic blocks are distributed circumferentially along the sliding nut, and the magnetic pole distribution of each first magnetic block is the same; the second magnetic attraction assembly includes a plurality of second magnetic blocks distributed circumferentially along the stop seat or along the valve seat assembly, wherein the S and N poles of the second magnetic blocks are distributed circumferentially along the stop seat or along the valve seat assembly, and the magnetic pole distribution of each second magnetic block is the same; the first magnetic blocks and the second magnetic blocks are staggered along the circumferential direction of the sliding nut, with each first magnetic block located between two adjacent second magnetic blocks, and the distribution of the first magnetic blocks and the distribution of the second magnetic blocks are the same, so that the two ends of each first magnetic block are attracted by the two second magnetic blocks respectively.

[0012] In one embodiment, both the first magnetic attraction component and the second magnetic attraction component are magnetic ring structures. The first magnetic attraction component has alternating S poles and N poles distributed along the circumference of the sliding nut. The second magnetic attraction component has alternating S poles and N poles distributed along the circumference of the stop seat or along the circumference of the valve seat assembly. The S poles in the first magnetic attraction component and the N poles in the second magnetic attraction component are arranged in a one-to-one correspondence and attract each other.

[0013] In one embodiment, the electronic expansion valve further includes a stop ring and a guide rod. The stop seat is provided with an outer guide rail on the outer periphery away from the lead screw. The stop ring is sleeved on the outer periphery of the stop seat and is movably engaged with the outer guide rail. The guide rod is fixedly connected to the rotor assembly or the lead screw so that the rotor assembly can drive the guide rod to push the stop ring to move spirally along the outer guide rail.

[0014] In one embodiment, the electronic expansion valve further includes a housing that covers the outside of the rotor assembly, a portion of the lead screw, and a portion of the valve core assembly and is welded to the valve seat assembly.

[0015] Compared to existing technologies, by incorporating a first magnetic attraction component and a second magnetic attraction component, the sliding nut can be prevented from rotating relative to the stop seat around the axis of the lead screw. In this state, the sliding nut can move relative to the lead screw along the axial direction of the lead screw, allowing the lead screw to drive the sliding nut to open or close the valve port. During normal operation, the rotor assembly and the lead screw do not move axially, simplifying the overall size of the electronic expansion valve.

[0016] Since the sliding nut is fixed with a first magnetic attraction component on its periphery, and the stop seat is provided with a second magnetic attraction component that can attract or repel the first magnetic attraction component, when the sliding nut has a tendency to rotate around the screw axis, the first magnetic attraction component on the sliding nut will be attracted or repelled by the second magnetic attraction component on the stop seat to prevent the sliding nut from continuing to rotate.

[0017] Further, the second magnetic attraction assembly extends along the axial direction of the stop seat, and therefore, when the first magnetic attraction assembly moves along the extension direction of the second magnetic attraction assembly, the first magnetic attraction assembly is not hindered by the second magnetic attraction assembly, that is, in this way, the axial movement of the sliding nut along the screw rod is not affected. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort based on these drawings.

[0019] Figure 1 A cross-sectional view of an electronic expansion valve according to an embodiment of the present application;

[0020] Figure 2 An assembly structure schematic view of a limiting structure, a sliding nut and a stop seat according to an embodiment of the present application;

[0021] Figure 3 An assembly structure schematic view of a limiting structure, a sliding nut and a stop seat according to another embodiment of the present application;

[0022] Figure 4 An assembly structure schematic view of a limiting structure, a sliding nut and a stop seat according to still another embodiment of the present application;

[0023] Figure 5 An assembly structure schematic view of a limiting structure, a sliding nut and a stop seat according to yet another embodiment of the present application;

[0024] Figure 6 An assembly structure schematic view of a limiting structure, a sliding nut and a stop seat according to still another embodiment of the present application;

[0025] Figure 7 An assembly structure schematic view of a limiting structure, a sliding nut and a stop seat according to still another embodiment of the present application.

[0026] Reference signs: 100, rotor assembly; 200, screw rod; 300, valve core assembly; 310, sliding nut; 312, first magnetic attraction assembly; 313, first magnetic block; 320, valve needle assembly; 400, valve seat assembly; 410, valve port; 510, stop seat; 511, external threaded portion; 516, second magnetic attraction assembly; 517, second magnetic block; 520, stop ring; 530, guide rod; 800, housing. DETAILED DESCRIPTION

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] It is to be understood that when an element is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element or intervening elements can be present. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0032] 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 in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0033] Referring to Figures 1-7 In an 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 port 410, the valve core assembly 300 is capable of moving along the axial direction of the screw rod 200 relative to the valve seat assembly 400, one end of the screw rod 200 is fixedly connected to the rotor assembly 100, the other end is connected to the valve core assembly 300, and the rotor assembly 100 is capable of driving the valve core assembly 300 to move towards the direction of approaching or moving away from the valve port 410 through the screw rod 200.

[0034] Specifically, the electronic expansion valve further includes a stop ring 520 and a guide rod 530, the stop seat 510 is further provided with an outer guide rail portion on the outer periphery side away from the screw rod 200, the stop ring 520 is sleeved on the outer periphery of the stop seat 510 and movably cooperates with the outer guide rail portion, specifically, the outer guide rail portion can be an outer thread portion 511 arranged on the outer periphery side of the stop seat 510 away from the screw rod 200, the stop ring 520 is sleeved on the outer periphery of the stop seat 510 and movably threadedly cooperates with the outer thread portion 511, the outer guide rail portion can also be a helical spring (not shown in the figure) spirally wound on the outer side of the stop seat 510, and the stop ring 520 spirally moves along the extension direction of the helical spring. The guide rod 530 is fixedly connected to the rotor assembly 100 or the screw rod 200, so that the rotor assembly 100 can drive the guide rod 530 to push the stop ring 520 to spirally move along the outer guide rail portion. Moreover, the screw rod 200 and the valve core assembly 300 are movably threadedly connected.

[0035] The valve core assembly 300 comprises a sliding nut 310 and a valve needle assembly 320, the screw rod 200 is threadedly connected to one end of the rotor assembly 100 and the sliding nut 310, and the screw rod 200 can drive the sliding nut 310 to move the valve core assembly 300 along the axial direction of the screw rod 200 relative to the stop seat 510, so as to open or close the valve port 410.

[0036] It should be noted that the electronic expansion valve further comprises a shell 800, which covers the outer side of the rotor assembly 100, part of the screw rod 200 and part of the valve core assembly 300 and is welded to the valve seat assembly 400.

[0037] Further, the sliding nut 310 is provided with a first magnetic assembly 312 on the circumferential side, and the stop seat 510 is provided with a second magnetic assembly 516 extending along the axial direction of the stop seat 510 corresponding to the first magnetic assembly 312, and the corresponding positions of the first magnetic assembly 312 and the second magnetic assembly 516 can be attracted to each other or repelled from each other, so as to prevent the sliding nut 310 from rotating around the axis of the screw rod 200 relative to the stop seat 510. It is defined that the first magnetic assembly 312 and the second magnetic assembly 516 constitute a limiting structure.

[0038] Since the sliding nut 310 is provided with the first magnetic assembly 312 on the circumferential side, and the stop seat 510 is provided with the second magnetic assembly 516 capable of attracting or repelling the first magnetic assembly 312, when the sliding nut 310 has a tendency to rotate around the axis of the screw rod 200, the first magnetic assembly 312 on the sliding nut 310 will be attracted or repelled by the second magnetic assembly 516 on the stop seat 510, so as to prevent the sliding nut 310 from continuing to rotate.

[0039] Further, the second magnetic assembly 516 extends along the axial direction of the stop seat 510, so that when the first magnetic assembly 312 moves along the extension direction of the second magnetic assembly 516, the first magnetic assembly 312 will not be hindered by the second magnetic assembly 516, that is, in this way, the movement of the sliding nut 310 along the axial direction of the screw rod 200 will not be affected.

[0040] Since the first magnetic assembly 312 and the second magnetic assembly 516 can limit the rotation of each other without contact, in this way, the sliding nut 310 and the stop seat 510 will not be in contact with each other, that is, the sliding nut 310 and the stop seat 510 will not be worn out, so as to avoid the increase of the gap between the sliding nut 310 and the stop seat 510 due to the wear of the sliding nut 310 and the stop seat 510, and further avoid the eccentricity of the sliding nut 310 relative to the stop seat 510, that is, avoid the eccentricity of the screw rod 200 relative to the stop seat 510.

[0041] In an embodiment, the first magnetic assembly 312 is embedded in the sliding nut 310, and the second magnetic assembly 516 is embedded in the stop seat 510 or the valve seat assembly 400.

[0042] Specifically, the sliding nut 310 is an injection molded part, and the first magnetic assembly 312 is embedded in the sliding nut 310 by an injection molding process. Similarly, the stop seat 510 is an injection molded part, and the second magnetic assembly 516 is embedded in the stop seat 510 or the valve seat assembly 400 by an injection molding process.

[0043] However, the first magnetic assembly 312 can also be connected, bonded or welded to the sliding nut 310, and the second magnetic assembly 516 can also be connected, bonded or welded to the stop seat 510 or the valve seat assembly 400 in other embodiments.

[0044] Further, in an embodiment, the first magnetic assembly 312 includes a plurality of first magnetic blocks 313 distributed circumferentially along the sliding nut 310, the S and N poles of the first magnetic blocks 313 are distributed along the radial direction of the sliding nut 310, and the magnetic pole distribution of adjacent first magnetic blocks 313 is opposite. The second magnetic assembly 516 includes a plurality of second magnetic blocks 517 distributed circumferentially along the stop seat 510 or the valve seat assembly 400, the S and N poles of the second magnetic blocks 517 are distributed along the radial direction of the stop seat 510 or the valve seat assembly 400, and the magnetic pole distribution of adjacent second magnetic blocks 517 is opposite. The first magnetic blocks 313 and the second magnetic blocks 517 are arranged one-to-one, and the first magnetic blocks 313 attract the corresponding second magnetic blocks 517.

[0045] It should be noted that the magnetic pole distribution of adjacent first magnetic blocks 313 is opposite, which means that when the S pole of one of the first magnetic blocks 313 is located away from the axis of the sliding nut 310, and the N pole is located close to the axis of the sliding nut 310, the S pole of the adjacent first magnetic block 313 is located close to the axis of the sliding nut 310, and the N pole is located away from the axis of the sliding nut 310.

[0046] The principle of the magnetic pole distribution of adjacent second magnetic blocks 517 is the same as the above principle.

[0047] In this way, when the sliding nut 310 and the stop seat 510 (or the valve seat assembly 400) have a tendency to rotate relative to each other, the circumferential direction of the sliding nut 310 is subjected to uniform magnetic force, preventing the sliding nut 310 from being deflected due to uneven force and affecting the axial displacement of the sliding nut 310.

[0048] Further, in another embodiment, the first magnetic assembly 312 comprises a plurality of first magnetic blocks 313 distributed along the circumference of the sliding nut 310, the S poles and the N poles of the first magnetic blocks 313 are distributed along the radial direction of the sliding nut 310, and the magnetic pole distribution of each first magnetic block 313 is the same. The second magnetic assembly 516 comprises a plurality of second magnetic blocks 517 distributed along the circumference of the stop seat 510 or the valve seat assembly 400, the S poles and the N poles of the second magnetic blocks 517 are distributed along the radial direction of the stop seat 510 or the valve seat assembly 400, and the magnetic pole distribution of each second magnetic block 517 is the same. The first magnetic blocks 313 and the second magnetic blocks 517 are arranged one by one corresponding, and the first magnetic blocks 313 attract the corresponding second magnetic blocks 517.

[0049] It should be noted that the magnetic pole distribution of each first magnetic block 313 is the same, which means that the S poles of all the first magnetic blocks 313 are located away from the axis of the sliding nut 310, and the N poles are located close to the axis of the sliding nut 310.

[0050] The principle of the same magnetic pole distribution of each second magnetic block 517 is the same as the above principle.

[0051] Further, in another embodiment, the first magnetic assembly 312 comprises a plurality of first magnetic blocks 313 distributed along the circumference of the sliding nut 310, the S poles and the N poles of the first magnetic blocks 313 are distributed along the radial direction of the sliding nut 310, and the magnetic pole distribution of each first magnetic block 313 is the same. The second magnetic assembly 516 comprises a plurality of second magnetic blocks 517 distributed along the circumference of the stop seat 510 or the valve seat assembly 400, the S poles and the N poles of the second magnetic blocks 517 are distributed along the radial direction of the stop seat 510 or the valve seat assembly 400, and the magnetic pole distribution of each second magnetic block 517 is the same. The first magnetic blocks 313 and the second magnetic blocks 517 are arranged in a circumferential staggered manner along the sliding nut 310, each first magnetic block 313 is located between two adjacent second magnetic blocks 517, and the first magnetic block 313 is repelled by the two second magnetic blocks 517 respectively.

[0052] Specifically, when the N poles of all the first magnetic blocks 313 are located away from the axis of the sliding nut 310, the N poles of the second magnetic blocks 517 are located close to the axis of the sliding nut 310. Conversely, when the S poles of all the first magnetic blocks 313 are located away from the axis of the sliding nut 310, the S poles of the second magnetic blocks 517 are located close to the axis of the sliding nut 310. In this way, repulsive forces can be generated between the first magnetic blocks 313 and the second magnetic blocks 517.

[0053] In this way, when the sliding nut 310 and the stop seat 510 (or the valve seat assembly 400) have a tendency to rotate relative to each other, whether clockwise or counterclockwise, the first magnetic block 313 on the sliding nut 310 will be repelled by the second magnetic block 517 on the stop seat 510 or the valve seat assembly 400, thereby preventing the sliding nut 310 from rotating relative to the stop seat 510 (or the valve seat assembly 400).

[0054] Further, in still another embodiment, the first magnetic attraction assembly 312 includes a plurality of first magnetic blocks 313 distributed circumferentially along the sliding nut 310, the S and N poles of the first magnetic blocks 313 being distributed circumferentially along the sliding nut 310, and the magnetic pole distribution of each first magnetic block 313 being the same. The second magnetic attraction assembly 516 includes a plurality of second magnetic blocks 517 distributed circumferentially along the stop seat 510 or the valve seat assembly 400, the S and N poles of the second magnetic blocks 517 being distributed circumferentially along the stop seat 510 or the valve seat assembly 400, and the magnetic pole distribution of each second magnetic block 517 being the same. The first magnetic blocks 313 and the second magnetic blocks 517 are arranged one-to-one, and the distribution of the first magnetic blocks 313 and the distribution of the second magnetic blocks 517 are opposite, so that the magnetic poles of the first magnetic blocks 313 and the corresponding magnetic poles of the second magnetic blocks 517 attract each other.

[0055] It should be noted that the magnetic pole distribution of each first magnetic block 313 being the same means that, taking the clockwise direction as an example, the N pole of each first magnetic block 313 is in front and the S pole is behind, or the S pole of each first magnetic block 313 is in front and the N pole is behind, i.e., along the circumference of the sliding nut 310, the entire first magnetic attraction assembly 312 has a magnetic pole arrangement of N-S-N-S-N-S.

[0056] The principle of the magnetic pole distribution of each second magnetic block 517 being the same is the same as the above principle.

[0057] The distribution of the first magnetic blocks 313 and the distribution of the second magnetic blocks 517 being opposite means that, taking the counterclockwise direction as an example, when the N pole of each first magnetic block 313 is in front and the S pole is behind, the S pole of each second magnetic block 517 is in front and the N pole is behind. In this way, the corresponding first magnetic block 313 and second magnetic block 517 can be firmly attracted to each other, thereby preventing the sliding nut 310 and the stop seat 510 (or the valve seat assembly 400) from rotating relative to each other.

[0058] Further, in still another embodiment, the first magnetic assembly 312 comprises a plurality of first magnetic blocks 313 circumferentially distributed along the sliding nut 310, the S pole and the N pole of each first magnetic block 313 are circumferentially distributed along the sliding nut 310, and the distribution of the magnetic poles of each first magnetic block 313 is the same. The second magnetic assembly 516 comprises a plurality of second magnetic blocks 517 circumferentially distributed along the stop seat 510 or the valve seat assembly 400, the S pole and the N pole of each second magnetic block 517 are circumferentially distributed along the stop seat 510 or the valve seat assembly 400, and the distribution of the magnetic poles of each second magnetic block 517 is the same. The first magnetic blocks 313 and the second magnetic blocks 517 are circumferentially arranged in a staggered manner along the sliding nut 310, any first magnetic block 313 is located between two adjacent second magnetic blocks 517, and the distribution of the first magnetic blocks 313 and the distribution of the second magnetic blocks 517 are the same, so that the two ends of each first magnetic block 313 are respectively subjected to the attracting effect of two second magnetic blocks 517.

[0059] It should be noted that the distribution of the first magnetic blocks 313 and the distribution of the second magnetic blocks 517 are the same, which means that, taking the counterclockwise direction as an example, when the N pole of each first magnetic block 313 is in front and the S pole is behind, the N pole of each second magnetic block 517 is in front and the S pole is behind. Since any first magnetic block 313 is located between two adjacent second magnetic blocks 517, the N pole in front of the first magnetic block 313 will be subjected to the attracting effect of the S pole of the front second magnetic block 517, and the S pole behind the first magnetic block 313 will be subjected to the attracting effect of the N pole of the rear second magnetic block 517.

[0060] In this way, it can be ensured that the corresponding first magnetic block 313 is firmly subjected to the attracting effect of the adjacent second magnetic block 517, so as to prevent the relative rotation of the sliding nut 310 and the stop seat 510 (or the valve seat assembly 400).

[0061] Further, in still another embodiment, the first magnetic assembly 312 comprises a plurality of first magnetic blocks 313 circumferentially distributed along the sliding nut 310, the S pole and the N pole of each first magnetic block 313 are circumferentially distributed along the sliding nut 310, and the distribution of the magnetic poles of each first magnetic block 313 is the same. The second magnetic assembly 516 comprises a plurality of second magnetic blocks 517 circumferentially distributed along the stop seat 510 or the valve seat assembly 400, the S pole and the N pole of each second magnetic block 517 are circumferentially distributed along the stop seat 510 or the valve seat assembly 400, and the distribution of the magnetic poles of each second magnetic block 517 is the same. The first magnetic blocks 313 and the second magnetic blocks 517 are circumferentially arranged in a staggered manner along the sliding nut 310, any first magnetic block 313 is located between two adjacent second magnetic blocks 517, and the distribution of the first magnetic blocks 313 and the distribution of the second magnetic blocks 517 are the same, so that the two ends of each first magnetic block 313 are respectively subjected to the attracting effect of two second magnetic blocks 517.

[0062] In this way, the assembly difficulty of the first magnetic assembly 312 and the second magnetic assembly 516 is greatly reduced.

[0063] Any combination of the technical features in the above-described embodiments can be made, and for the sake of brevity, not all possible combinations are described, however, as long as there is no conflict, any combination of the technical features should be considered within the scope of the present disclosure.

[0064] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to 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), a valve core assembly (300), and a valve seat assembly (400), wherein the valve seat assembly (400) is provided with a valve port (410). 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 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). One end of the lead screw (200) is fixedly connected to the rotor assembly (100). During the process of the lead screw (200) driving the sliding nut (310) to open or close the valve port (410) of the valve core assembly (300), the rotor assembly (100) and the lead screw (200) do not move axially. The sliding nut (310) is fixed with a first magnetic attraction component (312) on its periphery. The stop seat (510) or the valve seat assembly (400) is fixed with a second magnetic attraction component (516) extending along its own axial direction, corresponding to the first magnetic attraction component (312). The corresponding positions of the first magnetic attraction component (312) and the second magnetic attraction component (516) can attract or repel each other to prevent the sliding nut (310) from rotating relative to the stop seat (510) around the axis of the electronic expansion valve. Furthermore, the first magnetic attraction component (312) and the second magnetic attraction component (516) do not contact each other.

2. The electronic expansion valve according to claim 1, characterized in that, The first magnetic attraction component (312) is embedded in the sliding nut (310), and the second magnetic attraction component (516) is embedded in the stop seat (510) or the valve seat component (400).

3. The electronic expansion valve according to claim 1, characterized in that, The first magnetic attraction assembly (312) includes a plurality of first magnetic blocks (313) distributed circumferentially along the sliding nut (310). The S and N poles of the first magnetic blocks (313) are distributed radially along the sliding nut (310), and the magnetic pole distribution of adjacent first magnetic blocks (313) is opposite. The second magnetic attraction assembly (516) includes a plurality of second magnetic blocks (517). The plurality of second magnetic blocks (517) are distributed circumferentially along the stop seat (510) or along the valve seat assembly (400). The S and N poles of the second magnetic blocks (517) are distributed radially along the stop seat (510) or along the valve seat assembly (400), and the magnetic pole distribution of adjacent second magnetic blocks (517) is opposite. The first magnetic blocks (313) and the second magnetic blocks (517) are arranged in a one-to-one correspondence, and the first magnetic block (313) attracts the corresponding second magnetic block (517).

4. The electronic expansion valve according to claim 1, characterized in that, The first magnetic attraction assembly (312) includes a plurality of first magnetic blocks (313) distributed circumferentially along the sliding nut (310). The S and N poles of the first magnetic blocks (313) are distributed radially along the sliding nut (310), and the magnetic pole distribution of each first magnetic block (313) is the same. The second magnetic attraction assembly (516) includes a plurality of second magnetic blocks (517). The plurality of second magnetic blocks (517) are distributed circumferentially along the stop seat (510) or along the valve seat assembly (400). The S and N poles of the second magnetic blocks (517) are distributed radially along the stop seat (510) or along the valve seat assembly (400), and the magnetic pole distribution of each second magnetic block (517) is the same. The first magnetic blocks (313) and the second magnetic blocks (517) are arranged in a one-to-one correspondence, and the first magnetic block (313) attracts the corresponding second magnetic block (517).

5. The electronic expansion valve according to claim 1, characterized in that, The first magnetic attraction assembly (312) includes a plurality of first magnetic blocks (313) distributed circumferentially along the sliding nut (310). The S and N poles of the first magnetic blocks (313) are distributed radially along the sliding nut (310), and the magnetic pole distribution of each first magnetic block (313) is the same. The second magnetic attraction assembly (516) includes a plurality of second magnetic blocks (517). The plurality of second magnetic blocks (517) are distributed circumferentially along the stop seat (510) or along the valve seat assembly (400). The S and N poles of (517) are distributed radially along the stop seat (510) or radially along the valve seat assembly (400), and the magnetic pole distribution of each second magnetic block (517) is the same; the first magnetic block (313) and the second magnetic block (517) are arranged circumferentially offset along the sliding nut (310), each first magnetic block (313) is located between two adjacent second magnetic blocks (517), and the first magnetic block (313) is repelled by the two second magnetic blocks (517) respectively.

6. The electronic expansion valve according to claim 1, characterized in that, The first magnetic attraction assembly (312) includes a plurality of first magnetic blocks (313) distributed circumferentially along the sliding nut (310). The S and N poles of the first magnetic blocks (313) are distributed circumferentially along the sliding nut (310), and the magnetic pole distribution of each first magnetic block (313) is the same. The second magnetic attraction assembly (516) includes a plurality of second magnetic blocks (517). The plurality of second magnetic blocks (517) are distributed circumferentially along the stop seat (510) or along the valve seat assembly (400). The S and N poles of the second magnetic block (517) are distributed along the circumference of the stop seat (510) or along the circumference of the valve seat assembly (400), and the magnetic pole distribution of each second magnetic block (517) is the same; the first magnetic block (313) and the second magnetic block (517) are arranged in a one-to-one correspondence, and the distribution of the first magnetic block (313) is opposite to that of the second magnetic block (517), so that the magnetic poles of the first magnetic block (313) and the corresponding magnetic poles of the second magnetic block (517) attract each other.

7. The electronic expansion valve according to claim 1, characterized in that, The first magnetic attraction assembly (312) includes a plurality of first magnetic blocks (313) distributed circumferentially along the sliding nut (310). The S and N poles of the first magnetic blocks (313) are distributed circumferentially along the sliding nut (310), and the magnetic pole distribution of each first magnetic block (313) is the same. The second magnetic attraction assembly (516) includes a plurality of second magnetic blocks (517). The plurality of second magnetic blocks (517) are distributed circumferentially along the stop seat (510) or along the valve seat assembly (400). The S and N poles of the second magnetic blocks (517) are distributed circumferentially along the stop seat (510). The magnetic poles of the first magnetic block (313) and the second magnetic block (517) are distributed circumferentially or along the circumferential direction of the valve seat assembly (400), and the magnetic poles of each second magnetic block (517) are distributed in the same way; the first magnetic block (313) and the second magnetic block (517) are arranged in a staggered manner along the circumferential direction of the sliding nut (310), and any first magnetic block (313) is located between two adjacent second magnetic blocks (517), and the distribution of the first magnetic block (313) and the distribution of the second magnetic block (517) are the same, so that the two ends of each first magnetic block (313) are attracted by the two second magnetic blocks (517).

8. The electronic expansion valve according to claim 1, characterized in that, Both the first magnetic attraction component (312) and the second magnetic attraction component (516) are magnetic ring structures. The first magnetic attraction component (312) has alternating S poles and N poles distributed along the circumference of the sliding nut (310). The second magnetic attraction component (516) has alternating S poles and N poles distributed along the circumference of the stop seat (510) or along the circumference of the valve seat assembly (400). The S poles in the first magnetic attraction component (312) and the N poles in the second magnetic attraction component (516) are arranged in a one-to-one correspondence and attract each other. The N poles in the first magnetic attraction component (312) and the S poles in the second magnetic attraction component (516) are arranged in a one-to-one correspondence and attract each other.

9. The electronic expansion valve according to claim 1, characterized in that, It also includes a stop ring (520) and a guide rod (530). The stop seat (510) is provided with an outer guide rail on the 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 movably engaged with the outer guide rail. 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 spirally along the outer guide rail.

10. The electronic expansion valve according to claim 1, characterized in that, It also includes a housing (800) which covers the outside of the rotor assembly (100), a portion of the lead screw (200) and a portion of the valve core assembly (300) and is welded to the valve seat assembly (400).

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