Electronic expansion valve

Abstract

The utility model relates to an electronic expansion valve which comprises a coil structure, a support, a sleeve and a sealing piece, the support is fixed to the coil structure, and the periphery of the sleeve is sleeved with the support and the sleeve; the support is provided with an extending section extending in the axial direction of the sleeve, the sealing piece is located between the sleeve and the extending section in the radial direction of the sleeve, and the sealing piece can cut off a gap between the sleeve and the coil structure and prevent the coil structure from being communicated with the external environment. According to the electronic expansion valve, the sealing piece is arranged, so that the sealing performance of assembly of the sleeve and the coil structure can be improved.

Description

TECHNICAL FIELD

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

[0002] The electronic expansion valve is a common throttling element. The electronic expansion valve drives the valve needle to move through the magnetic field generated by the coil energization, so as to adjust the opening size of the valve port, and then realize the adjustment of the refrigerant flow size. The coil is usually sleeved on the outer periphery of the sleeve. Water vapor or other impurities are easy to enter the coil from between the coil and the sleeve and corrode the conductive structure in the coil, thereby causing the risk of damage to the coil and easily affecting the service life of the coil. CONTENT OF THE UTILITY MODEL

[0003] Therefore, it is necessary to provide an electronic expansion valve capable of improving the assembly sealing performance of the sleeve and the coil.

[0004] An electronic expansion valve, the electronic expansion valve comprising a coil structure, a bracket, a sleeve and a sealing element, the bracket being fixed to the coil structure and being sleeved on the outer periphery of the sleeve together with the coil structure; the bracket has an extension section extending along the axial direction of the sleeve, and the sealing element is located between the sleeve and the extension section along the radial direction of the sleeve, so as to block the gap between the sleeve and the coil structure and prevent the gap from being communicated with the external environment.

[0005] In one of the embodiments, the electronic expansion valve further comprises a valve seat assembly connected to the sleeve; the coil structure and the valve seat assembly are arranged in the axial direction of the sleeve; and the sealing element is located between the coil structure and the valve seat assembly.

[0006] In one of the embodiments, the coil structure has a first limiting surface, the valve seat assembly has a second limiting surface, one end of the sealing element abuts against the first limiting surface, and the other end of the sealing element abuts against the second limiting surface along the axial direction of the sleeve; the sealing element is compressed between the first limiting surface and the second limiting surface; one end of the sealing element is sealed with the first limiting surface to form a first sealing position, and the other end of the sealing element is sealed with the second limiting surface to form a second sealing position.

[0007] In one of the embodiments, the outer wall of the sealing element is in abutment with the inner wall of the extension section to form a third sealing position; the inner wall of the sealing element is in clearance fit with the outer wall of the sleeve when the sealing element is not subjected to the extrusion action of the first limiting surface and the second limiting surface; and the inner wall of the sealing element is in abutment with the outer wall of the sleeve to form a fourth sealing position under the extrusion action of the first limiting surface and the second limiting surface.

[0008] In one of the embodiments, the sealing element is in interference fit with the outer wall of the sleeve.

[0009] In one of the embodiments, the outer periphery of the sleeve is provided with a limiting structure, the bracket is connected with the limiting structure, and the coil structure is installed on the sleeve through the bracket; the coil structure and the limiting structure are arranged at intervals along the axial direction of the sleeve, and the two ends of the sealing member are in sealing fit with the coil structure and the limiting structure respectively.

[0010] In one of the embodiments, the extension section is provided with a mounting position, and the outer wall of the sealing member is provided with a matching position which is fixedly connected with the mounting position.

[0011] In one of the embodiments, one of the mounting position and the matching position is configured as a positioning hole or a positioning groove, and the other is configured as a positioning protrusion which is clamped in the positioning hole or the positioning groove and is in interference fit with the positioning hole or the positioning groove.

[0012] In one of the embodiments, the sealing member includes a first sealing section located on one side of the matching position along the axial direction of the sleeve, and the coil structure has a first limiting surface, the first sealing section being compressed between the first limiting surface and the mounting position; the first limiting surface is in sealing fit with the first sealing section to form a fifth sealing position.

[0013] In one of the embodiments, the electronic expansion valve further includes a valve seat assembly connected with the sleeve; the coil structure and the valve seat assembly are arranged at intervals along the axial direction of the sleeve; the sealing member further includes a second sealing section located on the other side of the matching position along the axial direction of the sleeve, one end of the second sealing section being connected with the first sealing section, and the other end extending towards the direction close to the valve seat assembly and being arranged in a suspended manner.

[0014] In one of the embodiments, the outer periphery of the sleeve is provided with a limiting structure, the bracket is connected with the limiting structure, and the coil structure is installed on the sleeve through the bracket, and is arranged at intervals along the axial direction of the sleeve and the limiting structure; the sealing member further includes a second sealing section located on the other side of the matching position along the axial direction of the sleeve, the other end extending towards the direction close to the limiting structure and being arranged in a suspended manner.

[0015] In one of the embodiments, the sealing member is in interference fit with the outer wall of the sleeve; the inner wall of the sealing member is in sealing fit with the outer wall of the sleeve to form a sixth sealing position.

[0016] In one of the embodiments, the electronic expansion valve further includes a valve seat assembly connected with the sleeve; the coil structure and the valve seat assembly are arranged at intervals along the axial direction of the sleeve; the sealing member is compressed between the coil structure and the valve seat assembly.

[0017] In one of the embodiments, one end of the sealing member is in sealing fit with the coil structure, and the other end is in sealing fit with the valve seat assembly.

[0018] In one of the embodiments, the outer periphery of the sleeve is provided with a limiting structure, the coil structure is installed on the sleeve through the bracket, and is arranged at intervals along the axial direction of the sleeve and the limiting structure; the sealing member is compressed between the coil structure and the limiting structure.

[0019] In one of the embodiments, one end of the sealing member is sealed with the coil structure, and the other end is sealed with the limiting structure.

[0020] In one of the embodiments, the valve seat assembly further comprises a valve body and a valve core seat, the valve body has a mounting cavity, at least part of the valve core seat is located in the mounting cavity and connected with the valve body, and the support further comprises a connecting frame connected with the valve body.

[0021] In one of the embodiments, the support further comprises a mounting plate connected with the extension section and arranged at an angle with the axis of the extension section, and the mounting plate is welded with the coil structure.

[0022] In one of the embodiments, the mounting plate is circular or non-circular in shape.

[0023] Compared with the prior art, the electronic expansion valve provided by the application can improve the sealing performance of the sleeve and the coil structure, block water vapor or other impurities from entering the inside of the coil structure from between the coil structure and the sleeve, and thus improve the service life of the coil structure. Moreover, the support can not only be used for mounting the coil structure, but also protect the sealing member from the outside. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the 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 application, and other drawings can be obtained by those skilled in the art without creative effort.

[0025] Figure 1 The structure schematic diagram of the electronic expansion valve in one of the embodiments provided by the application;

[0026] Figure 2 The cross-sectional view of the electronic expansion valve in the first embodiment provided by the application;

[0027] Figure 3 The structure schematic diagram of the electronic expansion valve in one of the embodiments provided by the application; Figure 2 The enlarged schematic diagram at A;

[0028] Figure 4 The cross-sectional view of the electronic expansion valve in the third embodiment provided by the application;

[0029] Figure 5 The structure schematic diagram of the electronic expansion valve in one of the embodiments provided by the application; Figure 4 The enlarged schematic diagram at B;

[0030] Figure 6 The axonometric view of the support in one of the embodiments provided by the application.

[0031] 100, electronic expansion valve; 10, coil structure; 11, first limit surface; 20, bracket; 21, extension section; 211, mounting position; 22, mounting plate; 23, connecting frame; 30, sleeve; 40, sealing member; 401, first sealing section; 402, second sealing section; 403, matching position; 41, first sealing position; 42, second sealing position; 43, third sealing position; 44, fourth sealing position; 45, fifth sealing position; 46, sixth sealing position; 50, valve seat assembly; 51, second limit surface; 52, valve body; 521, mounting cavity; 53, valve core seat. DETAILED DESCRIPTION

[0032] In order to make the above objectives, features and advantages of the present application more clear and comprehensible, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many different ways other than the embodiments described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0033] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there can be a middle component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or there can be a middle component. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar expressions used in the description of the present application are for the purpose of illustration only and do not indicate the only implementation.

[0034] In addition, the terms "first", "second", etc. are used only for descriptive purposes and should not be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0035] In the present application, unless otherwise explicitly specified and limited, the "on", "under", "above" and "over" of the first feature to the second feature can be that the first feature is in direct contact with the second feature, or the first feature is indirectly in contact with the second feature through an intermediate medium. Moreover, the "on", "above" and "over" of the first feature to the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "under", "below" and "under" of the first feature to the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0036] Unless otherwise defined, all technical and scientific terms used in the application's specification are intended to have the same meaning as commonly understood by one of ordinary skill in the art to which the application pertains. The terminology used in the application's specification is for describing particular embodiments only and is not intended to be limiting of the application. The use of the terms "and / or" includes a combination of one or more of the associated listed items.

[0037] Please refer to Figure 1 , Figure 2 and Figure 4 , the application provides an electronic expansion valve 100, the electronic expansion valve 100 includes a coil structure 10, a bracket 20, a sleeve 30 and a sealing element 40, the coil structure 10 includes a stator assembly and an injection body, the injection body is wrapped in part of the stator assembly, and the injection body has a containing cavity, and the containing cavity has an opening. The bracket 20 is fixed to the coil structure 10 and is sleeved with the coil structure 10 on the outer periphery of the sleeve 30. One end of the sleeve 30 extends into the containing cavity through the opening, and the sleeve 30 has a gap with the coil structure 10.

[0038] The bracket 20 has an extension segment 21 extending axially along the sleeve 30, and the sealing element 40 is located between the sleeve 30 and the extension segment 21 along the radial direction of the sleeve 30, and the sealing element 40 blocks the gap between the sleeve 30 and the coil structure 10, preventing the gap from communicating with the external environment. By providing the sealing element 40, the sealing performance of the assembly of the sleeve 30 and the coil structure 10 can be improved, and water vapor or other impurities can be prevented from entering the containing cavity of the coil structure 10 through the gap between the coil structure 10 and the sleeve 30, thereby facilitating the improvement of the service life of the coil structure 10. Moreover, the bracket 20 can not only be used for mounting the coil structure 10, but also can protect the sealing element 40 on the outer periphery of the sealing element 40.

[0039] The following describes various settings and matching forms of the coil structure 10, the bracket 20, the sleeve 30 and the sealing element 40 through several specific embodiments.

[0040] Embodiment one

[0041] Please refer to Figures 2-3 , the electronic expansion valve 100 further includes a valve seat assembly 50 connected to the sleeve 30, and the coil structure 10 is mounted to the valve seat assembly 50 through the bracket 20. The coil structure 10 and the valve seat assembly 50 are arranged axially spaced apart along the sleeve 30, and the sealing element 40 is located between the coil structure 10 and the valve seat assembly 50.

[0042] Further, the coil structure 10 has a first limiting surface 11, the valve seat assembly 50 has a second limiting surface 51, and one end of the sealing member 40 abuts against the first limiting surface 11 and the other end of the sealing member 40 abuts against the second limiting surface 51 along the axial direction of the sleeve 30; and the sealing member 40 is compressed between the first limiting surface 11 and the second limiting surface 51, that is, the first limiting surface 11 and the second limiting surface 51 cooperatively extrude the sealing member 40. Thus, a first sealing position 41 is formed between the one end of the sealing member 40 and the first limiting surface 11, and a second sealing position 42 is formed between the other end of the sealing member 40 and the second limiting surface 51.

[0043] It can be understood that there are two possible paths for water vapor or other impurities to enter the coil structure 10, one of which is from the gap between the coil structure 10 and the sealing member 40 into the accommodating cavity of the coil structure 10, and the first sealing position 41 can block this path; the other path is along the gap between the sealing member 40 and the valve seat assembly 50 into the coil structure 10, and the second sealing position 42 can block the water vapor or other impurities from entering between the sealing member 40 and the sleeve 30 from the end surface of the valve seat assembly 50 close to the coil structure 10, thereby blocking this path. In this way, the sealing member 40 can form an effective seal between the coil structure 10 and the sleeve 30.

[0044] In the embodiment, the distance between the first limiting surface 11 and the second limiting surface 51 along the axial direction of the sleeve 30 is greater than the height of the sealing member 40 in a natural state without external force, so that when the sealing member 40 is installed between the first limiting surface 11 and the second limiting surface 51, the first limiting surface 11 can cooperatively extrude the sealing member 40 with the second limiting surface 51.

[0045] Optionally, the cross section of the sealing member 40 is rectangular, so as to facilitate the abutment of the two ends of the sealing member 40 with the first limiting surface 11 and the second limiting surface 51, respectively.

[0046] Further, the outer wall of the sealing member 40 is in contact with the inner wall of the extension section 21 and forms a third sealing position 43. When the sealing member 40 is not extruded by the first limiting surface 11 and the second limiting surface 51, the inner wall of the sealing member 40 is in clearance fit with the outer wall of the sleeve 30; and under the extrusion of the first limiting surface 11 and the second limiting surface 51, the inner wall of the sealing member 40 is in contact with the outer wall of the sleeve 30 and forms a fourth sealing position 44.

[0047] Since the inner wall of the sealing member 40 is in clearance fit with the outer wall of the sleeve 30 when not being pressed by the first limiting surface 11 and the second limiting surface 51, the sealing member 40 is conveniently sleeved on the outer periphery of the sleeve 30. And under the pressing of the first limiting surface 11 and the second limiting surface 51, the sealing member 40 is radially expanded, so that the inner wall of the sealing member 40 changes from the clearance fit state with the outer wall of the sleeve 30 to the fit state with the outer wall of the sleeve 30. The third sealing position 43 can block water vapor or other impurities from entering the inside of the coil structure 10 along the outer wall of the sleeve 30. In this way, the sealing member 40, the sleeve 30, the valve seat assembly 50 and the coil structure 10 form a four-around seal.

[0048] Of course, it is not limited to this, but also through the interference fit between the sealing member 40 and the sleeve 30, the inner wall of the sealing member 40 is in fit sealing with the outer wall of the sleeve 30 to form the fourth sealing position 44.

[0049] Please refer to Figure 6 The bracket 20 further comprises a mounting plate 22 and a connecting frame 23. The mounting plate 22 is connected to the extension section 21 and is arranged at an angle to the axis of the extension section 21, and the coil structure 10 is connected to the mounting plate 22. One end of the connecting frame 23 is connected to the mounting plate 22, and the other end is used for detachably connecting the valve seat assembly 50.

[0050] Specifically, the mounting plate 22 is perpendicular to the axis of the extension section 21, so that the cross section of the bracket 20 is in the shape of "L". The injection body of the coil structure 10 is fusion welded on the mounting plate 22. The shape of the mounting plate 22 is circular, or non-circular structure such as square or triangular.

[0051] The valve seat assembly further comprises a valve body 52 and a valve core seat 53. The valve body 52 has a mounting cavity 521, and at least part of the valve core seat 53 is located in the mounting cavity 521 and connected with the valve body 52. The second limiting surface 51 is provided on the valve core seat 53. The connecting frame 23 is connected with the valve body 52. In this embodiment, the assembly sequence of the electronic expansion valve 100 is as follows: first, the bracket 20 is installed on the coil structure 10, and the sleeve 30 and the valve seat assembly 50 are assembled together; then the sealing member 40 is sleeved on the outer periphery of the sleeve 30; then the coil structure 10 and the bracket 20 are sleeved on the sleeve 30 together, and the extension section 21 is moved to the appropriate position along the outer wall of the sealing member 40; finally, the bracket 20 is fixed to the valve seat assembly 50.

[0052] Embodiment two

[0053] The difference between this embodiment and embodiment one is that in this embodiment, the valve seat assembly 50 is not provided, the coil structure 10 is installed on the sleeve 30 through the bracket 20 and the limiting structure, and the limiting structure cooperates with the coil structure 10 to realize the axial extrusion of the sealing member 40 along the sleeve 30.

[0054] Specifically, the outer periphery of the sleeve 30 is provided with a limiting structure, the bracket 20 is connected with the limiting structure, the coil structure 10 is installed on the sleeve 30 through the bracket 20, the coil structure 10 is arranged along the axial direction of the sleeve 30 and spaced from the limiting structure, and the two ends of the sealing element 40 are in sealing fit with the coil structure 10 and the limiting structure respectively.

[0055] Embodiment three

[0056] Please refer to Figure 4 and Figure 5 The extension section 21 is provided with a mounting position 211, and the outer wall of the sealing element 40 is provided with a matching position 403, which can be fixedly installed in the mounting position 211. By arranging the matching position 403 and the mounting position 211, the sealing element 40 can be installed in the extension section 21 during the assembly of the electronic expansion valve 100, so as to form an integral whole with the coil structure 10 and the bracket 20.

[0057] Among them, one of the mounting position 211 and the matching position 403 is configured as a positioning hole or a positioning groove, and the other is configured as a positioning protrusion, the positioning protrusion is clamped in the positioning hole or the positioning groove and is in interference fit with the positioning hole or the positioning groove. In this way, the sealing element 40 and the extension section 21 are conveniently positioned and installed, and since the positioning protrusion is in interference fit with the positioning hole or the positioning groove, a sealing position can also be formed at the mounting position 211 and the matching position 403.

[0058] Exemplarily, the mounting position 211 can be configured as a positioning hole, and the matching position 403 can be configured as a positioning protrusion arranged on the outer periphery of the sealing element 40. The positioning hole and the positioning protrusion are one-to-one corresponding and are both configured as a plurality of ones, and the plurality of positioning holes are uniformly and spacedly distributed along the circumferential direction of the extension section 21.

[0059] The sealing element 40 includes a first sealing section 401 located on the side of the matching position 403 along the axial direction of the sleeve 30, and the coil structure 10 has a first limiting surface 11, and the first sealing section 401 is pressed between the first limiting surface 11 and the mounting position 211. A fifth sealing position 45 is formed between the first limiting surface 11 and the first sealing section 401.

[0060] By arranging the fifth sealing position 45, water vapor or other impurities can be blocked from entering the inside of the coil structure 10 along the gap between the coil structure 10 and the sealing element 40. Moreover, the mounting position 211 can not only serve to install and fix the sealing element 40, but also can press the first sealing section 401 in cooperation with the first limiting surface 11, so as to form the fifth sealing position 45.

[0061] The distance between the mounting position 211 and the first limiting surface 11 is less than the height of the first sealing section 401 in a natural state without external force. When the sealing member 40 is fixed to the mounting position 211 through the fitting position 403, the mounting position 211 can press the first sealing section 401 together with the first limiting surface 11.

[0062] Further, under the pressing action of the mounting position 211 and the first limiting surface 11, the inner wall of the first sealing section 401 is in contact with the outer wall of the sleeve 30 and forms a sixth sealing position 46. It can be understood that, since the mounting position 211 and the first limiting surface 11 press the first sealing section 401 along the axial direction of the sleeve 30, the first sealing section 401 can expand radially along the sleeve 30, so that the inner wall of the first sealing section 401 can be in contact with the outer wall of the sleeve 30. The sixth sealing position 46 can block water vapor or other impurities from entering the assembly cavity of the coil structure 10 along the outer wall of the sleeve 30.

[0063] The electronic expansion valve further comprises a valve seat assembly 50 connected with the sleeve 30, and the coil structure 10 is connected with the valve seat assembly 50 through the bracket 20. The coil structure 10 and the valve seat assembly 50 are arranged in a spaced manner along the axial direction of the sleeve 30. The specific structure of the valve seat assembly 50 can refer to Embodiment One, which will not be described here. The sealing member 40 further comprises a second sealing section 402 located on the other side of the fitting position 403 along the axial direction of the sleeve 30, one end of the second sealing section 402 is connected with the first sealing section 401, and the other end extends towards the direction close to the valve seat assembly 50 and is arranged in a suspended manner.

[0064] In this embodiment, the assembly sequence of the electronic expansion valve 100 is as follows: first, the bracket 20 is installed on the coil structure 10, and the sealing member 40 is installed on the extension section 21 of the bracket 20, and the sleeve 30 and the valve seat assembly 50 are assembled together; then, the coil structure 10, the sealing member 40 and the extension section 21 are integrally arranged on the outer periphery of the sleeve 30 and moved to a suitable position; finally, the bracket 20 is fixed to the valve seat assembly 50.

[0065] Embodiment Four

[0066] The difference between this embodiment and Embodiment Three is that, in this embodiment, the valve seat assembly 50 is not provided, and the coil structure 10 is installed on the sleeve 30 through the bracket 20 and the limiting structure.

[0067] Specifically, the outer periphery of the sleeve 30 is provided with a limiting structure, the bracket 20 is connected with the limiting structure, the coil structure 10 is installed on the sleeve 30 through the bracket 20 and arranged in a spaced manner along the axial direction of the sleeve 30 and the limiting structure, one end of the second sealing section 402 is connected with the first sealing section 401, and the other end extends towards the direction close to the limiting structure and is arranged in a suspended manner.

[0068] Embodiment Five

[0069] The extension 21 is provided with a mounting position 211, and the outer wall of the sealing member 40 is provided with a matching position 403 which can be fixedly mounted in the mounting position 211. The difference between this embodiment and Embodiment Three is that the compression mode of the sealing member 40 along the axial and radial direction of the sleeve 30 is different.

[0070] Specifically, in this embodiment, the sealing member 40 is compressed between the coil structure 10 and the valve seat assembly 50, and one end of the sealing member 40 is sealed with the coil structure 10, and the other end is sealed with the valve seat assembly 50. The sealing member 40 is in interference fit with the outer wall of the sleeve 30, and the inner wall of the sealing member 40 is sealed with the outer wall of the sleeve 30 and forms a sixth sealing position 46.

[0071] Embodiment Six

[0072] The difference between this embodiment and Embodiment Five is that no valve seat assembly 50 is provided in this embodiment, and the coil structure 10 is mounted on the sleeve 30 through the bracket 20 and the limiting structure.

[0073] Specifically, the outer periphery of the sleeve 30 is provided with a limiting structure, the coil structure 10 is mounted on the sleeve 30 through the bracket 20 and is arranged along the axial direction of the sleeve 30 and spaced from the limiting structure; the sealing member 40 is compressed between the coil structure 10 and the limiting structure. One end of the sealing member 40 is sealed with the coil structure 10, and the other end is sealed with the limiting structure.

[0074] The technical features of the above-mentioned embodiments can be combined in any way. In order to make the description simple, not all possible combinations of the technical features in the above-mentioned embodiments are described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0075] The above-mentioned embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the 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 by, The electronic expansion valve (100) comprises a coil structure (10), a bracket (20), a sleeve (30) and a sealing member (40), the bracket (20) is fixed to the coil structure (10) and is sleeved with the coil structure (10) on the outer periphery of the sleeve (30); The bracket (20) has an extension segment (21) extending axially along the sleeve (30), and the sealing member (40) is located between the sleeve (30) and the extension segment (21) along the radial direction of the sleeve (30), so as to block the gap between the sleeve (30) and the coil structure (10) and prevent them from communicating with the external environment.

2. The electronic expansion valve according to claim 1, characterized in that The electronic expansion valve (100) further comprises a valve seat assembly (50) connected with the sleeve (30); the coil structure (10) and the valve seat assembly (50) are arranged axially along the sleeve (30) and are spaced apart from each other, and the sealing member (40) is located between the coil structure (10) and the valve seat assembly (50).

3. The electronic expansion valve according to claim 2, wherein The coil structure (10) has a first limiting surface (11), the valve seat assembly (50) has a second limiting surface (51), and one end of the sealing member (40) abuts against the first limiting surface (11) and the other end abuts against the second limiting surface (51) along the axial direction of the sleeve (30). The sealing member (40) is compressed between the first limiting surface (11) and the second limiting surface (51); one end of the sealing member (40) is sealed with the first limiting surface (11) to form a first sealing position (41), and the other end is sealed with the second limiting surface (51) to form a second sealing position (42).

4. The electronic expansion valve according to claim 3, characterized in that The outer wall of the sealing member (40) is sealed with the inner wall of the extension segment (21) to form a third sealing position (43); When not subjected to the extrusion of the first limiting surface (11) and the second limiting surface (51), the inner wall of the sealing member (40) is gap-fitted with the outer wall of the sleeve (30); Under the extrusion of the first limiting surface (11) and the second limiting surface (51), the inner wall of the sealing member (40) is sealed with the outer wall of the sleeve (30) to form a fourth sealing position (44).

5. The electronic expansion valve according to claim 1, wherein The sealing member (40) is interference-fitted with the outer wall of the sleeve (30).

6. The electronic expansion valve according to claim 1, wherein The outer periphery of the sleeve (30) is provided with a limiting structure, the bracket (20) is connected with the limiting structure, and the coil structure (10) is mounted on the sleeve (30) through the bracket (20); the coil structure (10) and the limiting structure are arranged axially along the sleeve (30) and are spaced apart from each other, and the two ends of the sealing member (40) are sealed with the coil structure (10) and the limiting structure, respectively.

7. The electronic expansion valve according to claim 1, wherein The extension segment (21) is provided with a mounting position (211), and the outer wall of the sealing member (40) is provided with a matching position (403) fixedly connected to the mounting position (211).

8. The electronic expansion valve according to claim 7, characterized in that One of the mounting position (211) and the matching position (403) is configured as a positioning hole or a positioning slot, and the other is configured as a positioning protrusion which is clamped in the positioning hole or the positioning slot and is in interference fit with the positioning hole or the positioning slot.

9. The electronic expansion valve according to claim 7, wherein The sealing member (40) comprises a first sealing segment (401) located on one side of the matching position (403) along the axial direction of the sleeve (30), and the coil structure (10) has a first limiting surface (11), and the first sealing segment (401) is compressed between the first limiting surface (11) and the mounting position (211). The first limiting surface (11) is in sealing abutment with the first sealing segment (401) to form a fifth sealing position (45).

10. The electronic expansion valve according to claim 9, wherein The electronic expansion valve further comprises a valve seat assembly (50) connected with the sleeve (30), and the coil structure (10) and the valve seat assembly (50) are arranged in axial spacing along the sleeve (30). The sealing member (40) further comprises a second sealing segment (402) located on the other side of the matching position (403) along the axial direction of the sleeve (30), and one end of the second sealing segment (402) is connected to the first sealing segment (401), and the other end extends towards the direction close to the valve seat assembly (50) and is arranged in suspension.

11. The electronic expansion valve according to claim 9, wherein The outer periphery of the sleeve (30) is provided with a limiting structure, the bracket (20) is connected with the limiting structure, and the coil structure (10) is mounted on the sleeve (30) through the bracket (20) and arranged in axial spacing along the sleeve (30) and the limiting structure. The sealing member (40) further comprises a second sealing segment (402) located on the other side of the matching position (403) along the axial direction of the sleeve (30), and the other end extends towards the direction close to the limiting structure and is arranged in suspension.

12. The electronic expansion valve according to claim 7, wherein The sealing member (40) is in interference fit with the outer wall of the sleeve (30), and the inner wall of the sealing member (40) is in sealing abutment with the outer wall of the sleeve (30) to form a sixth sealing position (46).

13. The electronic expansion valve according to claim 7, wherein The electronic expansion valve further comprises a valve seat assembly (50) connected with the sleeve (30), and the coil structure (10) and the valve seat assembly (50) are arranged in axial spacing along the sleeve (30); and the sealing member (40) is compressed between the coil structure (10) and the valve seat assembly (50).

14. The electronic expansion valve according to claim 13, wherein One end of the sealing member (40) is in sealing abutment with the coil structure (10), and the other end is in sealing abutment with the valve seat assembly (50).

15. The electronic expansion valve of claim 7, wherein, The outer periphery of the sleeve (30) is provided with a limiting structure, the coil structure (10) is mounted on the sleeve (30) through the bracket (20) and arranged in axial spacing along the sleeve (30) and the limiting structure. The sealing member (40) is compressed between the coil structure (10) and the limiting structure.

16. The electronic expansion valve according to claim 15, wherein One end of the sealing member (40) is in sealing abutment with the coil structure (10), and the other end is in sealing abutment with the limiting structure (31).

17. The electronic expansion valve according to claim 2, wherein The valve seat assembly further comprises a valve body (52) and a valve core seat (53), the valve body (52) has a mounting cavity (521), at least part of the valve core seat (53) is located in the mounting cavity (521) and connected with the valve body (52), the bracket (20) further comprises a connecting frame (23), the connecting frame (23) is connected with the valve body (52).

18. The electronic expansion valve according to any one of claims 1 to 17, characterized in that The bracket (20) further comprises a mounting plate (22), the mounting plate (22) is connected with the extension section (21) and arranged at an angle with the axis of the extension section (21), and the mounting plate (22) is welded and fixed with the coil structure (10).

19. The electronic expansion valve of claim 18, wherein, The mounting plate (22) is circular or non-circular in shape.

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