Electronic expansion valve

Abstract

The electronic expansion valve comprises a stop seat, a rotor assembly, a lead screw, a valve element assembly and a valve seat assembly, and the valve seat assembly is provided with a valve port part. The valve element assembly comprises a sliding nut and a valve needle assembly, the end, away from the rotor assembly, of the lead screw is in threaded fit with the sliding nut, and the lead screw can drive the sliding nut to drive the valve element assembly to move in the axial direction of the lead screw relative to the stop base so as to open or close the valve port part. A first magnetic attraction assembly is fixedly arranged on the peripheral side of the sliding nut, a second magnetic attraction assembly extending in the axial direction of the locking base is fixedly arranged on the position, corresponding to the first magnetic attraction assembly, of the locking base, and the corresponding positions of the first magnetic attraction assembly and the second magnetic attraction assembly can attract each other or repel each other so that the sliding nut can be prevented from rotating around the axis of the lead screw relative to the locking base. According to the electronic expansion valve, the problem that the abrasion degree between the valve element and the valve seat is high is solved.

Description

Technical Field

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

[0002] In the existing electronic expansion valve, the rotor is driven to move by the coil, and the rotor is fixedly connected to the screw rod. When the rotor rotates, it also drives 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, so the volume of the coil needs to be large enough. The larger 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 this application. Summary of the invention

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

[0005] The electronic expansion valve provided in the present application includes a stop seat, a rotor assembly, a screw rod, a valve core assembly and a valve seat assembly, and the valve seat assembly is provided with a valve mouth. The valve core assembly includes a sliding nut and a valve needle assembly, and one end of the screw rod away from the rotor assembly is threadedly matched 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 to open or close the valve mouth. A first magnetic attraction assembly is fixedly provided on the circumferential side of the sliding nut, and the stop seat or the valve seat assembly is fixedly provided with a second magnetic attraction assembly extending along its own axial direction corresponding to the first magnetic attraction assembly, and the corresponding positions of the first magnetic attraction assembly and the second magnetic attraction assembly can attract each other or repel each other to prevent the sliding nut from rotating relative to the stop seat around the axis of the electronic expansion valve.

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

[0007] In one of the embodiments, the first magnetic attraction component includes a plurality of first magnetic blocks distributed along the circumference of the sliding nut, the S poles and N poles of the first magnetic blocks are distributed along the radial direction of the sliding nut, and the magnetic pole distribution patterns of adjacent first magnetic blocks are opposite; the second magnetic attraction component includes a plurality of second magnetic blocks, the plurality of second magnetic blocks are distributed along the circumference of the stop seat or along the circumference of the valve seat assembly, the S poles and N poles of the second magnetic blocks are distributed along the radial direction of the stop seat or along the radial direction of the valve seat assembly, and the magnetic pole distribution patterns of adjacent second magnetic blocks are opposite; the first magnetic blocks and the second magnetic blocks are arranged 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 attraction component includes a plurality of first magnetic blocks distributed along the circumference of 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 mode of each first magnetic block is the same; the second magnetic attraction component includes a plurality of second magnetic blocks, the plurality of second magnetic blocks are distributed along the circumference of the stop seat or along the circumference of 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 along the radial direction of the valve seat assembly, and the magnetic pole distribution mode of each second magnetic block is the same; the first magnetic block and the second magnetic block are arranged in a one-to-one correspondence, and the first magnetic block attracts the corresponding second magnetic block.

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

[0010] In one of the embodiments, the first magnetic attraction component includes a plurality of first magnetic blocks distributed along the circumference of the sliding nut, the S pole and the N pole of the first magnetic block are distributed along the circumference of the sliding nut, and the magnetic pole distribution pattern of each first magnetic block is the same; the second magnetic attraction component includes a plurality of second magnetic blocks, the plurality of second magnetic blocks are distributed along the circumference of the stop seat or along the circumference of the valve seat assembly, the S pole and the N pole of the second magnetic block are distributed along the circumference of the stop seat or along the circumference of the valve seat assembly, and the magnetic pole distribution pattern of each second magnetic block is the same; the first magnetic block and the second magnetic block are arranged in a one-to-one correspondence, and the distribution pattern of the first magnetic block is opposite to the distribution pattern of the second magnetic block, so that the magnetic poles of the first magnetic block and the corresponding magnetic poles of the second magnetic block are attracted to each other.

[0011] In one of the embodiments, the first magnetic attraction component includes a plurality of first magnetic blocks distributed along the circumference of the sliding nut, the S pole and the N pole of the first magnetic block are distributed along the circumference of the sliding nut, and the magnetic pole distribution mode of each first magnetic block is the same; the second magnetic attraction component includes a plurality of second magnetic blocks, the plurality of second magnetic blocks are distributed along the circumference of the stop seat or along the circumference of the valve seat assembly, the S pole and the N pole of the second magnetic block are distributed along the circumference of the stop seat or along the circumference of the valve seat assembly, and the magnetic pole distribution mode of each second magnetic block is the same; the first magnetic block and the second magnetic block are staggered along the circumference of the sliding nut, any first magnetic block is correspondingly located between two adjacent second magnetic blocks, and the distribution mode of the first magnetic block is the same as the distribution mode of the second magnetic block, so that the two ends of each first magnetic block are respectively subjected to the attraction effect of the two second magnetic blocks.

[0012] In one of the embodiments, the first magnetic component and the second magnetic component are both magnetic ring structures, and the first magnetic component has S poles and N poles alternately arranged in sequence distributed along the circumference of the sliding nut, and the second magnetic component has S poles and N poles alternately arranged in sequence distributed along the circumference of the stop seat or along the circumference of the valve seat component, the S poles in the first magnetic component and the N poles in the second magnetic component are arranged one by one and attract each other, and the N poles in the first magnetic component and the S poles in the second magnetic component are arranged one by one and attract each other.

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

[0014] In one embodiment, the electronic expansion valve further comprises a shell, which is disposed on the outside of the rotor assembly, a part of the lead screw and a part of the valve core assembly and is welded to the valve seat assembly.

[0015] Compared with the prior art, by providing the first magnetic attraction component and the second magnetic attraction component, the sliding nut can be prevented from rotating relative to the stop seat around the axis of the screw rod. At this time, the sliding nut can move relative to the screw rod along the axial direction of the screw rod, so that the screw rod drives the sliding nut to drive the valve core component to open or close the valve port. In normal operation, the rotor component and the screw rod do not move in the axial direction, which can simplify the overall volume of the electronic expansion valve.

[0016] Since a first magnetic attraction component is fixedly provided on the circumferential side of the sliding nut, and a second magnetic attraction component is provided on the stop seat which can attract or repel the first magnetic attraction component, when the sliding nut has a tendency to rotate around the axis of the screw rod, 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] Furthermore, the second magnetic component extends axially along the stop seat. Therefore, when the first magnetic component moves along the extension direction of the second magnetic component, the first magnetic component will not be hindered by the second magnetic component. That is, such a setting will not affect the axial movement of the sliding nut along the screw rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

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

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

[0021] Figure 3 A schematic diagram of the assembly structure of a limiting structure, a sliding nut and a stop seat of another embodiment provided by the present application;

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

[0023] Figure 5 A schematic diagram of the assembly structure of a limiting structure, a sliding nut and a stop seat of another embodiment provided in the present application;

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

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

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

[0027] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0029] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0030] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0031] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0033] See also Figure 1-Figure 7 In one embodiment, the electronic expansion valve includes a stop seat 510, a rotor assembly 100, a screw rod 200, a valve core assembly 300 and a valve seat assembly 400. The stop seat 510 is fixedly connected to the valve seat assembly 400, and the stop seat 510 is arranged on the outer periphery of the screw rod 200. The valve seat assembly 400 is provided with a valve mouth portion 410. The valve core assembly 300 can move axially relative to the valve seat assembly 400 along the screw rod 200. One end of the screw rod 200 is fixedly connected to the rotor assembly 100, and the other end is connected to the valve core assembly 300. The rotor assembly 100 can drive the valve core assembly 300 to move toward or away from the valve mouth portion 410 through the screw rod 200.

[0034] Specifically, the electronic expansion valve further includes a stop ring 520 and a guide rod 530. The outer peripheral side of the stop seat 510 away from the screw rod 200 is also provided with an outer guide rail portion. 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 threaded portion 511 arranged on the outer peripheral 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 cooperates with the outer threaded portion 511. The outer guide rail portion can also be a spiral spring (not shown) spirally wound on the outer side of the stop seat 510. The stop ring 520 spirally moves along the extension direction of the spiral 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. In addition, the screw rod 200 and the valve core assembly 300 are movably threadedly connected.

[0035] The valve core assembly 300 includes a sliding nut 310 and a valve needle assembly 320. The end of the screw rod 200 away from the rotor assembly 100 is threadedly engaged with the sliding nut 310. The screw rod 200 can drive the sliding nut 310 to drive the valve core assembly 300 to move axially along the screw rod 200 relative to the stop seat 510 to open or close the valve mouth 410.

[0036] It should be noted that the electronic expansion valve further includes a housing 800 , which covers the outer sides of the rotor assembly 100 , a portion of the lead screw 200 and a portion of the valve core assembly 300 and is welded to the valve seat assembly 400 .

[0037] Furthermore, a first magnetic attraction component 312 is fixedly disposed on the circumferential side of the sliding nut 310, and a second magnetic attraction component 516 extending along its own axial direction is fixedly disposed on the stop seat 510 corresponding to the first magnetic attraction component 312, and 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 screw rod 200. The first magnetic attraction component 312 and the second magnetic attraction component 516 are defined to constitute a limiting structure.

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

[0039] Furthermore, the second magnetic component 516 extends axially along the stop seat 510. Therefore, when the first magnetic component 312 moves along the extension direction of the second magnetic component 516, the first magnetic component 312 will not be hindered by the second magnetic component 516. That is, such a setting will not affect the axial movement of the sliding nut 310 along the screw rod 200.

[0040] Since the first magnetic component 312 and the second magnetic component 516 can limit each other and stop rotation without contact, such a configuration will not cause contact between the sliding nut 310 and the stop seat 510, that is, the sliding nut 310 and the stop seat 510 will not wear each other, thereby avoiding wear between the sliding nut 310 and the stop seat 510 to cause an increase in the gap, thereby avoiding eccentricity of the sliding nut 310 relative to the stop seat 510, that is, avoiding eccentricity of the screw rod 200 relative to the stop seat 510.

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

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

[0043] But not limited to this, in other embodiments, the first magnetic component 312 can also be clamped, bonded or welded to the sliding nut 310, and the second magnetic component 516 can also be clamped, bonded or welded to the stop seat 510 or the valve seat assembly 400.

[0044] Further, in one embodiment, the first magnetic attraction component 312 includes a plurality of first magnetic blocks 313 distributed along the circumference of the sliding nut 310, the S poles and N poles of the first magnetic blocks 313 are distributed along the radial direction of the sliding nut 310, and the magnetic poles of adjacent first magnetic blocks 313 are distributed in opposite ways. The second magnetic attraction component 516 includes 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 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 poles of adjacent second magnetic blocks 517 are distributed in opposite ways. The first magnetic blocks 313 and the second magnetic blocks 517 are arranged in a one-to-one correspondence, 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, that is, when the S pole of one of the first magnetic blocks 313 is located at the end away from the axis of the sliding nut 310, and the N pole is located at the end close to the axis of the sliding nut 310, then the S pole of the first magnetic block 313 adjacent to the first magnetic block 313 is located at the end close to the axis of the sliding nut 310, and the N pole is located at the end away from the axis of the sliding nut 310.

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

[0047] With such arrangement, when the sliding nut 310 and the stop seat 510 (or the valve seat assembly 400) tend to rotate relative to each other, the sliding nut 310 can be subjected to uniform magnetic attraction force in the circumference, thereby preventing the sliding nut 310 from being deflected due to uneven force at different locations and affecting the axial displacement of the sliding nut 310.

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

[0049] It should be noted that the magnetic poles of each first magnetic block 313 are distributed in the same manner, that is, the S poles of all the first magnetic blocks 313 are located at the end away from the axis of the sliding nut 310 , and the N poles are located at the end 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] Furthermore, in another embodiment, the first magnetic attraction component 312 includes a plurality of first magnetic blocks 313 distributed along the circumference of the sliding nut 310, the S poles 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 mode of each first magnetic block 313 is the same. The second magnetic attraction component 516 includes 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 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 mode of each second magnetic block 517 is the same. The first magnetic blocks 313 and the second magnetic blocks 517 are staggered along the circumference of the sliding nut 310, each first magnetic block 313 is correspondingly located between two adjacent second magnetic blocks 517, and the first magnetic blocks 313 are respectively repelled by the two second magnetic blocks 517.

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

[0053] In this arrangement, 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 rotating 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, so as to prevent the sliding nut 310 from rotating relative to the stop seat 510 (or the valve seat assembly 400).

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

[0055] It should be noted that the same distribution of the magnetic poles of each first magnetic block 313 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 in the back, or the S pole of each first magnetic block 313 is in front and the N pole is in the back, that is, along the circumference of the sliding nut 310, the magnetic pole arrangement of the entire first magnetic attraction component 312 is NSNSNS.

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

[0057] The distribution of the first magnetic blocks 313 is opposite to the distribution of the second magnetic blocks 517. For example, in the counterclockwise direction, when the N pole of each first magnetic block 313 is at the front and the S pole is at the back, the S pole of each second magnetic block 517 is at the front and the N pole is at the back. In this way, the corresponding first magnetic blocks 313 and the second magnetic blocks 517 are firmly attracted to prevent the sliding nut 310 and the stop seat 510 (or the valve seat assembly 400) from rotating relative to each other.

[0058] Furthermore, in another embodiment, the first magnetic attraction component 312 includes a plurality of first magnetic blocks 313 distributed along the circumference of the sliding nut 310, the S poles and N poles of the first magnetic blocks 313 are distributed along the circumference of the sliding nut 310, and the magnetic poles of each first magnetic block 313 are distributed in the same manner. The second magnetic attraction component 516 includes 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 N poles of the second magnetic blocks 517 are distributed along the circumference of the stop seat 510 or the valve seat assembly 400, and the magnetic poles of each second magnetic block 517 are distributed in the same manner. The first magnetic blocks 313 and the second magnetic blocks 517 are staggered along the circumference of the sliding nut 310, any first magnetic block 313 is correspondingly located between two adjacent second magnetic blocks 517, and the distribution mode of the first magnetic blocks 313 and the distribution mode 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 attraction of the two second magnetic blocks 517.

[0059] It should be noted that the distribution mode of the first magnetic block 313 is the same as the distribution mode of the second magnetic block 517, 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 in the back, the N pole of each second magnetic block 517 is in front and the S pole is in the back. And because any first magnetic block 313 is correspondingly located between two adjacent second magnetic blocks 517, the N pole of the first magnetic block 313 in front will be attracted by the S pole of the second magnetic block 517 in front, and the S pole of the first magnetic block 313 in the back will be attracted by the N pole of the second magnetic block 517 in the back.

[0060] In this way, it can be ensured that the corresponding first magnetic block 313 is firmly attracted by the adjacent second magnetic block 517 to prevent the sliding nut 310 and the stop seat 510 (or the valve seat assembly 400) from rotating relative to each other.

[0061] Furthermore, in another embodiment, the first magnetic component 312 and the second magnetic component 516 are both magnetic ring structures, and the first magnetic component 312 has S poles and N poles distributed in sequence and alternately arranged along the circumference of the sliding nut 310, and the second magnetic component 516 has S poles and N poles distributed in sequence and alternately arranged along the circumference of the stop seat 510 or the valve seat assembly 400, the S poles in the first magnetic component 312 and the N poles in the second magnetic component 516 are arranged in one-to-one correspondence and attract each other, and the N poles in the first magnetic component 312 and the S poles in the second magnetic component 516 are arranged in one-to-one correspondence and attract each other.

[0062] Such a configuration greatly reduces the difficulty of assembling the first magnetic attraction component 312 and the second magnetic attraction component 516 .

[0063] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0064] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. An electronic expansion valve, characterized in that: It comprises a stop seat (510), a rotor assembly (100), a screw rod (200), a valve core assembly (300) and a valve seat assembly (400), wherein the valve seat assembly (400) is provided with a valve port portion (410); The valve core assembly (300) comprises a sliding nut (310) and a valve needle assembly (320); one end of the screw rod (200) away from the rotor assembly (100) is threadedly matched with the sliding nut (310); the screw rod (200) can drive the sliding nut (310) to drive the valve core assembly (300) to move relative to the stop seat (510) along the axial direction of the screw rod (200) to open or close the valve port (410); A first magnetic component (312) is fixedly provided on the circumferential side of the sliding nut (310); the stop seat (510) or the valve seat assembly (400) is fixedly provided with a second magnetic component (516) extending along its own axial direction corresponding to the first magnetic component (312); the corresponding positions of the first magnetic component (312) and the second magnetic component (516) can attract each other or repel each other to prevent the sliding nut (310) from rotating around the axis of the electronic expansion valve relative to the stop seat (510).

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 component (312) includes a plurality of first magnetic blocks (313) distributed along the circumference of the sliding nut (310), the S poles and N poles of the first magnetic blocks (313) are distributed along the radial direction of the sliding nut (310), and the magnetic poles of adjacent first magnetic blocks (313) are distributed in opposite ways; the second magnetic attraction component (516) includes a plurality of second magnetic blocks (517), the plurality of second magnetic blocks (517) are distributed along the circumference of the stop seat (510) or along the circumference of the valve seat component (400), the S poles and N poles of the second magnetic blocks (517) are distributed along the radial direction of the stop seat (510) or along the radial direction of the valve seat component (400), and the magnetic poles of adjacent second magnetic blocks (517) are distributed in opposite ways; the first magnetic blocks (313) and the second magnetic blocks (517) are arranged in one-to-one correspondence, and the first magnetic blocks (313) attract the corresponding second magnetic blocks (517).

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

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

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

8. The electronic expansion valve according to claim 1, characterized in that: The first magnetic component (312) and the second magnetic component (516) are both magnetic ring structures, and the first magnetic component (312) has S poles and N poles that are alternately arranged in sequence distributed along the circumference of the sliding nut (310), and the second magnetic component (516) has S poles and N poles that are alternately arranged in sequence distributed along the circumference of the stop seat (510) or along the circumference of the valve seat component (400), the S pole in the first magnetic component (312) and the N pole in the second magnetic component (516) are arranged in a one-to-one correspondence and are attracted to each other, and the N pole in the first magnetic component (312) and the S pole in the second magnetic component (516) are arranged in a one-to-one correspondence and are attracted to 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); an outer guide rail portion is provided on the outer peripheral 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 cooperates with the outer guide rail portion; the guide rod (530) is fixedly connected to the rotor assembly (100) or the screw rod (200) so that the rotor assembly (100) can drive the guide rod (530) to push the stop ring (520) to move spirally along the outer guide rail portion.

10. The electronic expansion valve according to claim 1, characterized in that: It also includes a housing (800), which is disposed on the outside 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).

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