Electronic Expansion Valve

Abstract

An electronic expansion valve including a coil assembly (10) having a mounting hole (11), a valve body assembly (40) partially inserted into the mounting hole, and a hard seal member (30) disposed in a gap between the inner wall of the mounting hole and the outer wall of the valve body assembly, and sealingly engaged with both the valve body assembly and the mounting hole. The electronic expansion valve employs a hard seal engagement in which the valve body assembly and the hard seal member are directly sealed and engaged, which avoids a situation in which a soft seal is weak at high temperatures and easily worn out, leading to sealing failure and even failure of the electronic expansion valve, and ensures sealing between the valve body assembly and the coil assembly, thereby improving the reliability of the electronic expansion valve.

Description

[Technical field]

[0001] This application claims priority to a patent application filed with the China National Intellectual Property Office on June 6, 2022, bearing application number 202210631689.2 and titled invention-creation "Electronic Expansion Valve."

[0002] The present application relates to the technical field of electronic expansion valves, and more particularly to electronic expansion valves. [Background technology]

[0003] After the mounting hole and the valve body assembly of the electronic expansion valve are assembled, a relatively large gap will be formed between the mounting hole and the surface of the valve body assembly, and contaminants such as water scale will easily flow into the coil assembly along the gap between the valve body assembly and the mounting hole, causing corrosion of the stator housing and stator plate of the coil assembly, and ultimately causing the failure of the product.

[0004] In response to the above situation, the prior art electronic expansion valve generally adopts soft sealing members such as sealing rings to seal the gap between the valve body assembly and the mounting hole. However, the soft sealing members are weak against high temperatures and are easily worn out. During the operation of the electronic expansion valve, the electronic expansion valve is constantly in a vibrating state, which easily causes poor sealing due to the wear of the sealing ring. At the same time, the internal temperature of the coil assembly rises with the operation, and the high temperature affects the sealing ring at the sealing position, causing the sealing ring to break down due to the high temperature and shortening its lifespan.

[0005] The present application provides an electronic expansion valve to solve the problem that the soft seal between the mounting hole and the valve body assembly in the prior art is prone to failure.

[0006] In order to solve the above problems, the present application provides an electronic expansion valve including a coil assembly having a mounting hole, a valve body assembly having a portion inserted into the mounting hole, and a hard seal member disposed in a gap between an inner wall of the mounting hole and an outer wall of the valve body assembly, and sealingly engaged with both the valve body assembly and the mounting hole.

[0007] Furthermore, the hard seal member is provided on the inner wall of the mounting hole, and if the radial dimension of the hard seal member is D1 and the radial dimension of the mounting hole is D3, then D3-D1<0.2 mm.

[0008] Furthermore, if the radial dimension of the hard seal member is D1 and the outer diameter of the sealing engagement portion between the valve body assembly and the hard seal member is D2, then D2≦D1.

[0009] Furthermore, in the axial direction of the mounting hole, the hard seal member has a first chamfer on the side facing the coil assembly, and a second chamfer on the side facing the valve body assembly, where the radial width of the first chamfer in the hard seal member is L1, such that L1<(D3-D1) / 2.

[0010] Further, the valve body assembly includes a sleeve and a valve body portion connected to each other, a portion of the sleeve is inserted into the mounting hole, and the hard seal member is an annular boss, which is located between the inner wall of the mounting hole and the outer wall of the sleeve, and is provided on the inner wall of one end of the mounting hole facing the valve body portion and is sealingly engaged with the outer wall of the sleeve, or is provided on the outer wall of the sleeve facing the valve body portion and is sealingly engaged with the inner wall of the mounting hole.

[0011] Furthermore, the coil assembly includes a resin-sealed housing and a coil portion provided within the resin-sealed housing, the resin-sealed housing has a mounting hole, and the hard seal member and the resin-sealed housing are of an integral structure.

[0012] Further, the coil assembly includes a resin-sealed housing and a coil portion, the resin-sealed housing includes an injection-molded housing and an annular member connected to each other, the coil portion is located within a chamber of the injection-molded housing, the injection-molded housing has a first through hole, the annular member has a second through hole, the first through hole and the second through hole constitute mounting holes, a hard seal member is provided on an inner wall of the second through hole, and the hard seal member and the annular member are of an integral structure.

[0013] Furthermore, one end of the injection molded housing toward the annular member has a first mounting groove surrounding the mounting hole, the annular member includes a first annular plate and a second annular plate provided on the first annular plate, the outer diameter of the second annular plate is smaller than the outer diameter of the first annular plate, the second annular plate is positioned in the first mounting groove, and the first annular plate abuts against the injection molded housing, the resin sealed housing further includes a first limiting structure provided on the injection molded housing, the annular member further includes a second limiting structure provided on the first annular plate, and the first limiting structure and the second limiting structure are in limiting engagement.

[0014] Further, the first limiting structure includes a first positioning protrusion and a first positioning groove provided on the injection molded housing, and the second limiting structure is located on the side of the first annular plate facing the second annular plate and includes a second positioning protrusion and a second positioning groove provided on the first annular plate, where the second positioning protrusion is provided in the first positioning groove and the first positioning protrusion is provided in the second positioning groove.

[0015] Further, the coil assembly includes an injection molded housing having a first through hole and a first mounting groove surrounding the first through hole, the first through hole and the first mounting groove forming a mounting hole, the valve body assembly includes a sleeve and a valve body portion connected to each other, a portion of the sleeve passes through the first mounting groove and is inserted into the first through hole, and the hard seal member is fitted to an outer wall of the sleeve, or the hard seal member and the sleeve are of an integral structure, and the hard seal member is sealingly engaged with an inner wall of the first mounting groove.

[0016] Moreover, the electronic expansion valve further includes a protective cover, which is connected to the coil assembly and includes a sealing head, which seals one opening of the mounting hole.

[0017] Further, the coil assembly includes a resin-sealed housing and a coil portion provided within the resin-sealed housing, the resin-sealed housing has a second mounting groove surrounding the mounting hole, the protective cover further includes an annular limiting plate surrounding the sealing head, one end of the sealing head is inserted into the second mounting groove, the annular limiting plate abuts against the resin-sealed housing, the coil assembly further includes a third limiting structure provided on the resin-sealed housing, and the protective cover further includes a fourth limiting structure provided on the annular limiting plate, the third limiting structure and the fourth limiting structure are in limiting engagement.

[0018] Furthermore, the coil assembly includes a resin-sealed housing and a coil portion provided within the resin-sealed housing, and the protective cover and the resin-sealed housing are of an integral structure.

[0019] Furthermore, the protective cover is of one-piece construction and further includes a protective sleeve connected to the sealing head, the protective sleeve having a first accommodating chamber, the coil assembly being disposed within the first accommodating chamber, and the sealing head having a second accommodating chamber, the second accommodating chamber being in communication with the mounting hole.

[0020] The technical aspects of the present application provide an electronic expansion valve including a coil assembly having a mounting hole, a valve body assembly partially inserted into the mounting hole, and a hard seal member disposed in a gap between an inner wall of the mounting hole and an outer wall of the valve body assembly, and sealingly engaged with both the valve body assembly and the mounting hole. By using this aspect, one end of the mounting hole of the coil assembly is sealed by the hard seal member, thereby avoiding a situation in which impurities enter the coil assembly from one end of the mounting hole during the operation of the electronic expansion valve, causing the coil assembly to break down, and ensuring the reliability of the electronic expansion valve. Furthermore, this aspect employs a hard seal engagement in which the valve body assembly and the annular boss are directly sealed and engaged, and compared with the prior art method of using a soft seal member to seal the gap between the valve body assembly and the mounting hole, this aspect avoids a situation in which the soft seal is weak at high temperatures and easily worn, causing the electronic expansion valve to break down, and ensures the sealing between the valve body assembly and the coil assembly, thereby improving the reliability of the electronic expansion valve. [Brief description of the drawings]

[0021] The drawings in the specification that form a part of this application are intended to provide a further understanding of the application, and the schematic examples and their explanations are intended to interpret the application and are not intended to unduly limit the application.

[0022] [Figure 1] 1 shows a structural schematic diagram of an electronic expansion valve provided in Example 1 of the present application. [Diagram 2] 2 shows an enlarged view of position A in FIG. 1. [Diagram 3] 2 shows a schematic diagram of the structures of the coil assembly, protective cover, and annular boss in FIG. 1. [Figure 4] An enlarged view of position C in FIG. [Diagram 5] 1 shows a structural schematic diagram of a coil assembly, a protective cover and an annular boss provided in Example 2 of the present invention. [Figure 6] 6 shows an enlarged view of position B in FIG. 5. [Figure 7] A structural schematic diagram of the annular member in FIG. 5 is shown. [Figure 8] FIG. 3 is a structural schematic diagram of an electronic expansion valve provided in Example 3 of the present invention. [Figure 9] 9 shows an enlarged view of position D in FIG. 8. [Figure 10] 13 shows a structural schematic diagram of a coil assembly, a protective cover and an annular boss provided in Example 4 of the present invention. [Figure 11] 13 shows a structural schematic diagram of a coil assembly, a protective cover and an annular boss provided in Example 5 of the present invention.

[0023] Here, the above drawings include the following reference numbers: 10 coil assembly, 11 mounting hole, 12 resin-sealed housing, 121 injection-molded housing, 122 annular member, 1221 first annular plate, 1222 second annular plate, 1223 second limiting structure, 12231 second positioning protrusion, 12232 second positioning groove, 123 first limiting structure, 13 coil portion, 14 third limiting structure, 20 protective cover, 21 sealing head, 22 annular limiting plate, 23 fourth limiting structure, 24 protective sleeve, 30 hard seal member, 31 first chamfer, 32 second chamfer, 40 valve body assembly, 41 sleeve, 42 valve body portion. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Hereinafter, the technical aspects of the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, but it is clear that the described embodiments are merely some of the embodiments of the present application, and are not all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the scope of protection of the present application.

[0025] As shown in Figures 1 to 4, Example 1 of the present application provides an electronic expansion valve including a coil assembly 10 having a mounting hole 11, a valve body assembly 40 a portion of which is inserted into the mounting hole 11, and a hard seal member 30 disposed in a gap between the inner wall of the mounting hole 11 and the outer wall of the valve body assembly 40, and sealingly engaged with both the valve body assembly 40 and the mounting hole 11.

[0026] In this embodiment, one end of the mounting hole 11 of the coil assembly 10 is sealed by the hard seal member 30, thereby preventing impurities from entering the coil assembly 10 from one end of the mounting hole 11 during the operation of the electronic expansion valve, which would cause the coil assembly 10 to malfunction, and ensuring the reliability of the electronic expansion valve. Furthermore, this embodiment adopts a hard seal engagement in which the valve body assembly 40 and the hard seal member 30 are directly sealed and engaged, and compared with the prior art method of using a soft seal member to seal the gap between the valve body assembly and the mounting hole, this embodiment avoids the situation in which the soft seal is weak at high temperatures and easily worn, which would cause the seal to malfunction and even cause the electronic expansion valve to malfunction, and ensures the sealing between the valve body assembly 40 and the coil assembly 10, thereby improving the reliability of the electronic expansion valve.

[0027] 2, the hard seal 30 is disposed on the inner wall of the mounting hole 11, and the radial dimension of the hard seal 30 is D1, and the radial dimension of the mounting hole 11 is D3, where D3-D1<0.2 mm. In this embodiment, the dimensions D1 and D3 are limited to ensure the stability of the sealing between the hard seal 30 and the valve body assembly 40, and at the same time, ensure the reliability of the assembly between the coil assembly 10 and the valve body assembly 40. When D1 and D3 are close to each other or D3 is smaller than D1, the coil assembly 10 and the valve body assembly 40 are not easily assembled due to interference or precision, and the reliability of the electronic expansion valve is ensured.

[0028] Specifically, if the radial dimension of the hard seal member 30 is D1 and the outer diameter of the portion where the valve disc assembly 40 and the hard seal member 30 are sealed and engaged is D2, then D2≦D1. In this embodiment, by limiting the dimensions D1 and D2, the stability of the seal between the hard seal member 30 and the valve disc assembly 40 and the reliability of the assembly of the coil assembly 10 and the valve disc assembly 40 are further ensured. Specifically, when D2=D1, the sealing effect between the hard seal member 30 and the valve disc assembly 40 is optimal.

[0029] Furthermore, in the axial direction of the mounting hole 11, the hard seal member 30 has a first chamfer 31 on the side facing the coil assembly 10, and a second chamfer 32 on the side facing the valve body assembly 40, where L1 is the radial width of the first chamfer 31 on the hard seal member 30, such that L1<(D3-D1) / 2. In this embodiment, by limiting the size of the first chamfer 31, the sealing effect between the hard seal member 30 and the valve body assembly 40 is ensured, while at the same time improving the structural strength of the hard seal member 30 and ensuring the reliability and stability of the sealing of the hard seal member 30.

[0030] Specifically, the valve body assembly 40 includes a sleeve 41 and a valve body portion 42 connected to each other, a portion of the sleeve 41 is inserted into the mounting hole 11, and the hard seal member 30 is an annular boss, which is located between the inner wall of the mounting hole 11 and the outer wall of the sleeve 41, and is provided on the inner wall of one end of the mounting hole 11 facing the valve body portion 42 and sealingly engaged with the outer wall of the sleeve 41, or is provided on the outer wall of the sleeve 41 facing the valve body portion 42 and sealingly engaged with the inner wall of the mounting hole 11. By providing the annular boss in this manner, processing and installation of the annular boss are facilitated, and the annular boss can easily seal the gap between the sleeve 41 and the coil assembly 10.

[0031] Alternatively, the annular boss may be provided on the outer peripheral surface of the sleeve 41 and formed integrally with the sleeve 41, or in an electronic expansion valve of another structure, the annular boss may be provided on the outer peripheral surface of the valve body portion 42 and formed integrally with the valve body portion 42.

[0032] 3 and 4, the coil assembly 10 includes a resin-sealed housing 12 and a coil portion 13 provided within the resin-sealed housing 12, the resin-sealed housing 12 has an attachment hole 11, and the hard seal member 30 and the resin-sealed housing 12 are integral with each other. By providing the hard seal member 30 in this manner, processing of the hard seal member 30 becomes easy.

[0033] Specifically, the electronic expansion valve further includes a protective cover 20 , which is connected to the coil assembly 10 and includes a sealing head 21 , which seals one opening of the mounting hole 11 .

[0034] In this embodiment, the provision of the protective cover 20 prevents the situation in which scale flowing in from the opening at the top of the coil assembly 10 flows into the coil section 13 along the gap between the sleeve 41 and the mounting hole 11, or the fluid directly enters the coil section 13 from the opening at the top of the coil assembly 10, causing corrosion of the stator housing and stator plates of the coil and ultimately causing failure of the product, thereby ensuring the reliability of the electronic expansion valve.

[0035] As shown in FIG. 3, the coil assembly 10 includes a resin-sealed housing 12 and a coil portion 13 provided within the resin-sealed housing 12, the resin-sealed housing 12 has a second mounting groove surrounding the mounting hole 11, the protective cover 20 further includes an annular limiting plate 22 surrounding the sealing head 21, one end of the sealing head 21 is inserted into the second mounting groove and the annular limiting plate 22 abuts against the resin-sealed housing 12, the coil assembly 10 further includes a third limiting structure 14 provided on the resin-sealed housing 12, and the protective cover 20 further includes a fourth limiting structure 23 provided on the annular limiting plate 22, and the third limiting structure 14 and the fourth limiting structure 23 are in limiting engagement.

[0036] In this embodiment, the sealing head 21 is inserted into the second mounting groove and limitedly engaged with the second mounting groove, making it easy to install and position the protective cover 20, and the protective cover 20 and the resin-sealed housing 12 are limitedly engaged by the third limiting structure 14 and the fourth limiting structure 23, which further improves the positioning accuracy of the protective cover 20 and the resin-sealed housing 12 and ensures the reliability of the installation and the stability of the connection between the protective cover 20 and the resin-sealed housing 12.

[0037] 3, the third limiting structure 14 includes a third positioning protrusion and a third positioning groove provided on the resin-sealed housing 12, and the fourth limiting structure 23 includes a fourth positioning protrusion and a fourth positioning groove provided on the annular limiting plate 22, where the third positioning protrusion and the fourth positioning protrusion are both annular protrusions, the third positioning groove and the fourth positioning groove are both annular grooves, the third positioning protrusion is provided in the fourth positioning groove and is limitingly engaged with the fourth positioning groove, and the fourth positioning protrusion is provided in the third positioning groove and is limitingly engaged with the third positioning groove. Here, there are two third positioning protrusions, the third positioning groove is provided between the two third positioning protrusions, there are two fourth positioning grooves, and the fourth positioning protrusion is provided between the two fourth positioning grooves, or there are two third positioning grooves, the third positioning protrusion is provided between the two third positioning grooves, and there are two fourth positioning protrusions, and the fourth positioning groove is provided between the two fourth positioning protrusions. By providing the protective cover 20 in this manner, it becomes easy to realize the positioning and connection between the resin-sealed housing 12, and the reliability and stability of the connection between the resin-sealed housing 12 and the protective cover 20 is ensured.

[0038] Optionally, the numbers of the third positioning protrusions, the fourth positioning protrusions, the third positioning grooves and the fourth positioning grooves can be adjusted according to actual circumstances.

[0039] As shown in Fig. 5 to Fig. 7, the second embodiment of the present invention provides an electronic expansion valve that is different from the above-mentioned embodiments in that the coil assembly 10 includes a resin-sealed housing 12 and a coil portion 13, the resin-sealed housing 12 includes an injection-molded housing 121 and an annular member 122 connected to each other, the coil portion 13 is located in a chamber of the injection-molded housing 121, the injection-molded housing 121 has a first through hole, the annular member 122 has a second through hole, the first through hole and the second through hole form the mounting hole 11, the hard seal member 30 is provided on the inner wall of the second through hole, and the hard seal member 30 and the annular member 122 are integrally formed. When provided in this manner, the hard seal member 30 and the annular member 122 are integrally processed and molded, which makes it easy to process the hard seal member 30. Specifically, the injection-molded housing 121 and the annular member 122 are provided separately, and the annular member 122 and the injection-molded housing 121 are connected by welding.

[0040] Specifically, one end of the injection molded housing 121 toward the annular member 122 has a first mounting groove surrounding the mounting hole 11, the annular member 122 includes a first annular plate 1221 and a second annular plate 1222 provided on the first annular plate 1221, the outer diameter of the second annular plate 1222 is smaller than the outer diameter of the first annular plate 1221, the second annular plate 1222 is positioned within the first mounting groove, the first annular plate 1221 abuts against the injection molded housing 121, the resin sealed housing 12 further includes a first limiting structure 123 provided on the injection molded housing 121, the annular member 122 further includes a second limiting structure 1223 provided on the first annular plate 1221, and the first limiting structure 123 and the second limiting structure 1223 are in limiting engagement.

[0041] In this embodiment, the second annular plate 1222 of the annular member 122 is disposed in the first mounting groove and is limitedly engaged with the first mounting groove, so as to facilitate the mounting and positioning of the annular member 122, and the first annular plate 1221 and the injection molded housing 121 are abutted and limitedly engaged by the first limiting structure 123 and the second limiting structure 1223, thereby further improving the positioning accuracy of the annular member 122 and ensuring the reliability of the mounting and the stability of the connection between the annular member 122 and the injection molded housing 121.

[0042] Optionally, the injection molded housing 121 and the first limiting structure 123 are integral, and the annular member 122 and the second limiting structure 1223 are integral. The injection molded housing 121 and the annular member 122 are connected by a welding process.

[0043] Furthermore, the first limiting structure 123 includes a first positioning protrusion and a first positioning groove provided on the injection molded housing 121, and the second limiting structure 1223 is located on the side of the first annular plate 1221 facing the second annular plate 1222, and includes a second positioning protrusion 12231 and a second positioning groove 12232 provided on the first annular plate 1221, where the second positioning protrusion 12231 is provided in the first positioning groove, and the first positioning protrusion is provided in the second positioning groove 12232. With this arrangement, the positioning of the injection molded housing 121 and the first annular plate 1221 is completed by the limiting engagement between the positioning protrusion and the positioning groove, improving the mounting accuracy and the positioning reliability. Specifically, as shown in FIG. 3, in this embodiment, the first positioning protrusion and the second positioning protrusion 12231 are both annular protrusions, the first positioning groove and the second positioning groove 12232 are both annular grooves, there are two first positioning grooves and two second positioning protrusions 12231, the first positioning protrusion is located between the two first positioning grooves, and the second positioning groove 12232 is located between the two second positioning protrusions 12231, thereby further ensuring the reliability and stability of the connection between the injection molded housing 121 and the first annular plate 1221.

[0044] Optionally, the numbers of the first positioning protrusions, the second positioning protrusions 12231, the first positioning grooves and the second positioning grooves 12232 can be adjusted according to actual circumstances.

[0045] As shown in Figures 8 and 9, the third embodiment of the present invention provides an electronic expansion valve which is different from the above-mentioned embodiments in that the coil assembly 10 includes an injection-molded housing 121, the injection-molded housing 121 has a first through-hole and a first mounting groove surrounding the first through-hole, the first through-hole and the first mounting groove form a mounting hole 11, the valve body assembly 40 includes a sleeve 41 and a valve body portion 42 connected to each other, a portion of the sleeve 41 passes through the first mounting groove and is inserted into the first through-hole, and the hard seal member 30 is fitted into the outer wall of the sleeve 41, or the hard seal member 30 and the sleeve 41 are integral with each other, and the hard seal member 30 is sealingly engaged with the inner wall of the first mounting groove. By configuring it in this manner, the hard seal member 30 and the sleeve 41 can be processed as a single unit, which facilitates rapid processing of the hard seal member 30; alternatively, the hard seal member 30 and the sleeve 41 can be processed separately and fixedly connected, which facilitates simultaneously ensuring the structural strength of the hard seal member 30 and the sleeve 41; by providing the hard seal member 30 in the first mounting groove and sealingly engaging with the first mounting groove, a sealing effect for the gap between the mounting hole 11 of the hard seal member 30 and the sleeve 41 is ensured, and sealing reliability is ensured.

[0046] 10, the fourth embodiment of the present invention provides an electronic expansion valve that is different from the above-mentioned embodiments in that the coil assembly 10 includes a resin-sealed housing 12 and a coil portion 13 provided in the resin-sealed housing 12, and the protective cover 20 and the resin-sealed housing 12 are integral with each other. This arrangement makes it easier to process the protective cover 20.

[0047] 11, the fifth embodiment of the present invention provides an electronic expansion valve which is different from the above-mentioned embodiments in that the protective cover 20 is of an integral structure and further includes a protective sleeve 24 connected to the sealing head 21, the protective sleeve 24 has a first accommodating chamber, the coil assembly 10 is disposed in the first accommodating chamber, the sealing head 21 has a second accommodating chamber, and the second accommodating chamber communicates with the mounting hole 11. By providing it in this way, the protective cover 20 can provide protection for the entire coil assembly 10, improve the reliability of the coil assembly 10, and ensure the performance of the electronic expansion valve.

[0048] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Those skilled in the art can make various modifications and variations to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A coil assembly (10) having a mounting hole (11); a valve body assembly (40) having a portion inserted into the mounting hole (11); a hard seal member (30) provided in a gap between an inner wall of the mounting hole (11) and an outer wall of the valve body assembly (40), and sealingly engaged with both the valve body assembly (40) and the mounting hole (11).

2. 2. The electronic expansion valve according to claim 1, wherein the hard seal member (30) is provided on an inner wall of the mounting hole (11), and a radial dimension of the hard seal member (30) is D1 and a radial dimension of the mounting hole (11) is D3, where D3-D1<0.2 mm.

3. 3. The electronic expansion valve according to claim 2, wherein, when a radial dimension of the hard seal member (30) is D1 and an outer diameter of a sealing engagement portion between the valve body assembly (40) and the hard seal member (30) is D2, D2≦D1.

4. 3. The electronic expansion valve according to claim 2, wherein, in the axial direction of the mounting hole (11), the hard seal member (30) has a first chamfer (31) on a side facing the coil assembly (10), and the hard seal member (30) has a second chamfer (32) on a side facing the valve body assembly (40), wherein, when a radial width of the first chamfer (31) in the hard seal member (30) is L1, L1<(D3-D1) / 2.

5. 2. The electronic expansion valve according to claim 1, wherein the valve body assembly (40) includes a sleeve (41) and a valve body portion (42) connected to each other, a portion of the sleeve (41) is inserted into the mounting hole (11), and the hard seal member (30) is an annular boss, the annular boss being located between an inner wall of the mounting hole (11) and an outer wall of the sleeve (41), and being provided on an inner wall of one end of the mounting hole (11) facing the valve body portion (42) and sealingly engaged with the outer wall of the sleeve (41), or being provided on an outer wall of the sleeve (41) facing the valve body portion (42) and sealingly engaged with the inner wall of the mounting hole (11).

6. 2. The electronic expansion valve according to claim 1, wherein the coil assembly (10) includes a resin-sealed housing (12) and a coil portion (13) provided in the resin-sealed housing (12), the resin-sealed housing (12) has the mounting hole (11), and the hard seal member (30) and the resin-sealed housing (12) are of an integral structure.

7. 2. The electronic expansion valve according to claim 1, wherein the coil assembly (10) includes a resin-sealed housing (12) and a coil portion (13), the resin-sealed housing (12) includes an injection-molded housing (121) and an annular member (122) connected to each other, the coil portion (13) is located in a chamber of the injection-molded housing (121), the injection-molded housing (121) has a first through hole, the annular member (122) has a second through hole, the first through hole and the second through hole constitute the mounting hole (11), the hard seal member (30) is provided on an inner wall of the second through hole, and the hard seal member (30) and the annular member (122) are of an integral structure.

8. The injection molded housing (121) has a first mounting groove surrounding the mounting hole (11) at one end toward the annular member (122), and the annular member (122) includes a first annular plate (1221) and a second annular plate (1222) provided on the first annular plate (1221), the outer diameter of the second annular plate (1222) is smaller than the outer diameter of the first annular plate (1221), and the second annular plate (1222) is positioned within the first mounting groove. The electronic expansion valve of claim 7, wherein the first annular plate (1221) is abutted against the injection molded housing (121), the resin sealed housing (12) further includes a first limiting structure (123) provided on the injection molded housing (121), the annular member (122) further includes a second limiting structure (1223) provided on the first annular plate (1221), and the first limiting structure (123) and the second limiting structure (1223) are in limiting engagement.

9. The electronic expansion valve of claim 8, wherein the first limiting structure (123) includes a first positioning protrusion and a first positioning groove provided on the injection molded housing (121), and the second limiting structure (1223) is located on a side of the first annular plate (1221) facing the second annular plate (1222) and includes a second positioning protrusion (12231) and a second positioning groove (12232) provided on the first annular plate (1221), wherein the second positioning protrusion (12231) is provided in the first positioning groove and the first positioning protrusion is provided in the second positioning groove (12232).

10. 2. The electronic expansion valve according to claim 1, wherein the coil assembly (10) includes an injection-molded housing (121), the injection-molded housing (121) has a first through hole and a first mounting groove surrounding the first through hole, the first through hole and the first mounting groove constitute the mounting hole (11), the valve body assembly (40) includes a sleeve (41) and a valve body portion (42) connected to each other, a portion of the sleeve (41) passes through the first mounting groove and is inserted into the first through hole, the hard seal member (30) is fitted to an outer wall of the sleeve (41), or the hard seal member (30) and the sleeve (41) are integral with each other, and the hard seal member (30) and the inner wall of the first mounting groove are sealingly engaged with each other.

11. 2. The electronic expansion valve of claim 1, further comprising a protective cover (20), the protective cover (20) being connected to the coil assembly (10) and including a sealing head (21), the sealing head (21) sealing one opening of the mounting hole (11).

12. 12. The electronic expansion valve according to claim 11, wherein the coil assembly (10) includes a resin-sealed housing (12) and a coil portion (13) provided in the resin-sealed housing (12), the resin-sealed housing (12) has a second mounting groove provided surrounding the mounting hole (11), the protective cover (20) further includes an annular limiting plate (22) provided surrounding the sealing head (21), one end of the sealing head (21) is inserted into the second mounting groove, the annular limiting plate (22) abuts against the resin-sealed housing (12), the coil assembly (10) further includes a third limiting structure (14) provided on the resin-sealed housing (12), and the protective cover (20) further includes a fourth limiting structure (23) provided on the annular limiting plate (22), and the third limiting structure (14) and the fourth limiting structure (23) are in limiting engagement with each other.

13. The electronic expansion valve according to claim 11, wherein the coil assembly (10) includes a resin-sealed housing (12) and a coil portion (13) provided within the resin-sealed housing (12), and the protective cover (20) and the resin-sealed housing (12) are of an integral structure.

14. 12. The electronic expansion valve of claim 11, wherein the protective cover (20) is of one-piece structure and further includes a protective sleeve (24) connected to the sealing head (21), the protective sleeve (24) having a first accommodating chamber, the coil assembly (10) being disposed in the first accommodating chamber, and the sealing head (21) having a second accommodating chamber, the second accommodating chamber being in communication with the mounting hole (11).

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