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 the priority of a patent application with application number 202210631689.2 and invention-creation title "Electronic Expansion Valve", which was filed with the China National Intellectual Property Administration on June 6, 2022.

[0002] This application relates to the technical field of electronic expansion valves, specifically to electronic expansion valves.

Background Art

[0003] After the mounting hole of the electronic expansion valve and the valve body assembly are assembled, a relatively large gap is generated between the mounting hole and the surface of the valve body assembly, and contaminants such as scale are likely to 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 pole plate of the coil assembly, and ultimately resulting in product failure.

[0004] In response to the above situation, in the electronic expansion valve in the prior art, usually, a soft sealing member such as a sealing ring is adopted to seal the gap between the valve body assembly and the mounting hole. However, the soft sealing member is vulnerable to high temperatures and prone to wear. Since the electronic expansion valve is always in a vibrating state during the operation process, it is easy to cause a situation where poor sealing is caused by 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 fail at high temperature and shortening its lifespan. Summary of the Application

[0005] This 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] To solve the above problems, this application provides an electronic expansion valve comprising a coil assembly having a mounting hole, a valve body assembly in which a portion is inserted into the mounting hole, and a hard seal member provided in the gap between the inner wall of the mounting hole and the outer wall of the valve body assembly, which is sealed and 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. 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 we denote the radial dimension of the hard seal member as D1 and the outer diameter of the portion where the valve assembly and the hard seal member are sealed together as 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 L1 is the radial width of the first chamfer on the hard seal member, and L1 < (D3 - D1) / 2.

[0010] Furthermore, the valve assembly includes a sleeve and a valve body connected to each other, the sleeve being partially inserted into a mounting hole, and the hard seal member being 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 and seal-engaged with the outer wall of the sleeve, or is provided on the outer wall of the sleeve facing the valve body and seal-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 mounting holes, and the hard seal member and the resin-sealed housing are integrally structured.

[0012] Furthermore, the coil assembly includes a resin-sealed housing and a coil section, the resin-sealed housing includes an injection-molded housing and an annular member connected to each other, the coil section is located within the 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 and second through-holes constitute mounting holes, a hard seal member is provided on the inner wall of the second through-hole, and the hard seal member and the annular member are integrally structured.

[0013] Furthermore, one end of the injection-molded housing facing the annular member has a first mounting groove surrounding a 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 located in the first mounting groove, the first annular plate abuts against the injection-molded housing, the resin-sealed housing further includes a first restricting structure provided on the injection-molded housing, the annular member further includes a second restricting structure provided on the first annular plate, and the first restricting structure and the second restricting structure are restricted-engaged.

[0014] Furthermore, the first limiting structure includes a first positioning projection 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 toward the second annular plate and includes a second positioning projection and a second positioning groove provided on the first annular plate, where the second positioning projection is provided in the first positioning groove and the first positioning projection is provided in the second positioning groove.

[0015] Furthermore, the coil assembly includes an injection-molded housing, the 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 constitute a mounting hole, the valve body assembly includes a sleeve and a valve body connected to each other, the sleeve having a portion that penetrates the first mounting groove and is inserted into the first through-hole, the hard seal member is fitted to the outer wall of the sleeve, or the hard seal member and the sleeve are an integral structure, and the hard seal member and the inner wall of the first mounting groove are sealed and engaged.

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

[0017] Furthermore, the coil assembly includes a resin-sealed housing and a coil portion provided within the resin-sealed housing, the resin-sealed housing having a second mounting groove surrounding a mounting hole, the protective cover further includes an annular limiting plate provided surrounding a sealing head, one end of the sealing head being inserted into the second mounting groove, the annular limiting plate being in contact with the resin-sealed housing, the coil assembly further includes a third limiting structure provided on the resin-sealed housing, the protective cover further includes a fourth limiting structure provided on the annular limiting plate, and the third limiting structure and the fourth limiting structure are restricted-engaged.

[0018] Furthermore, the coil assembly includes a resin-sealed housing and a coil section provided within the resin-sealed housing, and the protective cover and the resin-sealed housing are integrally structured.

[0019] Furthermore, the protective cover is an integral structure and further includes a protective sleeve connected to the sealing head, the protective sleeve having a first housing chamber, the coil assembly being housed within the first housing chamber, and the sealing head having a second housing chamber, the second housing chamber communicating with a mounting hole.

[0020] Applying the technical aspects of this application, an electronic expansion valve is provided, comprising a coil assembly having a mounting hole, a valve body assembly partially inserted into the mounting hole, and a hard seal member provided in the gap between the inner wall of the mounting hole and the outer wall of the valve body assembly, which seals and engages with both the valve body assembly and the mounting hole. By adopting this embodiment, the hard seal member seals one end of the mounting hole of the coil assembly, thereby preventing a situation in which impurities enter the coil assembly from one end of the mounting hole during the operation of the electronic expansion valve and cause the coil assembly to fail, and ensuring the reliability of the electronic expansion valve. Furthermore, this embodiment employs a hard seal engagement in which the valve body assembly and the annular boss are directly seal-engaged. Compared to the conventional method of using a soft seal member to seal the gap between the valve body assembly and the mounting hole, this embodiment avoids a situation in which the seal fails due to problems such as the soft seal being susceptible to high temperatures and wear, and furthermore, causes the electronic expansion valve to fail, thereby ensuring the airtightness between the valve body assembly and the coil assembly and improving the reliability of the electronic expansion valve. [Brief explanation of the drawing]

[0021] The drawings in the specification, which constitute part of this application, are provided for further understanding of this application, and the schematic embodiments and descriptions thereof are for interpretation purposes only and do not improperly limit this application.

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

[0023] Here, the above drawings include the following reference numerals. 10 Coil assembly, 11 Mounting hole, 12 Resin-sealed housing, 121 Injection molding 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 part, 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 part

Mode for Carrying Out the Invention

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

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

[0026] In this embodiment, by sealing one end of the mounting hole 11 of the coil assembly 10 with the hard seal member 30, a situation in which impurities enter the coil assembly 10 from one end of the mounting hole 11 during the operation of the electronic expansion valve and cause the coil assembly 10 to fail is avoided, thereby ensuring the reliability of the electronic expansion valve. Furthermore, this embodiment employs a hard seal engagement in which the valve body assembly 40 and the hard seal member 30 are directly sealed and engaged. Compared to the conventional method of using a soft seal member to seal the gap between the valve body assembly and the mounting hole, this embodiment avoids a situation in which the seal fails due to problems such as the soft seal being susceptible to high temperatures and wear, and furthermore, causes the electronic expansion valve to fail, thereby ensuring the airtightness between the valve body assembly 40 and the coil assembly 10 and improving the reliability of the electronic expansion valve.

[0027] As shown in Figure 2, the hard seal member 30 is provided on the inner wall of the mounting hole 11. If the radial dimension of the hard seal member 30 is D1 and the radial dimension of the mounting hole 11 is D3, then D3-D1 < 0.2 mm. In this embodiment, by limiting the dimensions of D1 and D3, the stability of the seal between the hard seal member 30 and the valve body assembly 40 is ensured, while at the same time ensuring the reliability of the assembly of the coil assembly 10 and the valve body assembly 40. When D1 and D3 are similar or D3 is smaller than D1, situations where the coil assembly 10 and the valve body assembly 40 become difficult to assemble due to interference or the influence of precision are avoided, thereby ensuring the reliability of the electronic expansion valve.

[0028] Specifically, if the radial dimension of the hard seal member 30 is D1, and the outer diameter of the portion of the valve body assembly 40 that is sealed and engaged with the hard seal member 30 is D2, then D2 ≤ D1. In this embodiment, by limiting the dimensions of D1 and D2, the stability of the seal between the hard seal member 30 and the valve body assembly 40 and the reliability of the assembly between the coil assembly 10 and the valve body assembly 40 are further ensured. Specifically, when D2 = D1, the sealing effect between the hard seal member 30 and the valve body 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, and L1 < (D3 - D1) / 2. In this embodiment, by limiting the dimensions of the first chamfer 31, the sealing effect between the hard seal member 30 and the valve body assembly 40 is ensured, while simultaneously 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 assembly 40 includes a sleeve 41 and a valve body 42 connected to each other, with a portion of the sleeve 41 penetrating 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 42 and is sealed with the outer wall of the sleeve 41, or is provided on the outer wall of the sleeve 41 on the side facing the valve body 42 and is sealed with the inner wall of the mounting hole 11. This arrangement facilitates the processing and installation of the annular boss and facilitates sealing of the gap between the sleeve 41 and the coil assembly 10.

[0031] Optionally, the annular boss may be provided on the outer circumferential surface of the sleeve 41 and integrally with the sleeve 41, or, in electronic expansion valves of other structures, it may be provided on the outer circumferential surface of the valve body 42 and integrally with the valve body 42.

[0032] As shown in Figures 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 mounting holes 11, and the hard seal member 30 and the resin-sealed housing 12 are integrally structured. This configuration facilitates the processing of the hard seal member 30.

[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, by providing the protective cover 20, the reliability of the electronic expansion valve is ensured by preventing situations in which limescale 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 where fluid enters the coil section 13 directly from the opening at the top of the coil assembly 10, causing corrosion of the coil's stator housing and stator plates, ultimately leading to product failure.

[0035] As shown in Figure 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 having a second mounting groove surrounding a mounting hole 11, the protective cover 20 further includes an annular limiting plate 22 surrounding a 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, the third limiting structure 14 and the fourth limiting structure 23 are restricted and engaged.

[0036] In this embodiment, the sealing head 21 is inserted into the second mounting groove and restrictedly engaged with the second mounting groove, which facilitates the mounting and positioning of the protective cover 20. Furthermore, the protective cover 20 and the resin sealing housing 12 are restrictedly engaged by the third restricting structure 14 and the fourth restricting structure 23, which further improves the positioning accuracy of the protective cover 20 and the resin sealing housing 12, ensuring the reliability of the mounting and the stability of the connection between the protective cover 20 and the resin sealing housing 12.

[0037] Specifically, as shown in Figure 3, the third limiting structure 14 includes a third positioning projection and a third positioning groove provided on the resin sealing housing 12, and the fourth limiting structure 23 includes a fourth positioning projection and a fourth positioning groove provided on the annular limiting plate 22. Both the third and fourth positioning projections are annular projections, and both the third and fourth positioning grooves are annular grooves. The third positioning projection is provided within the fourth positioning groove and restrictedly engaged with the fourth positioning groove, and the fourth positioning projection is provided within the third positioning groove and restrictedly engaged with the third positioning groove. Here, there are two third positioning projections and the third positioning groove is provided between the two third positioning projections, and there are two fourth positioning grooves and the fourth positioning projection is provided between the two fourth positioning grooves, or there are two third positioning grooves and the third positioning projection is provided between the two third positioning grooves, and there are two fourth positioning projections and the fourth positioning groove is provided between the two fourth positioning projections. This configuration facilitates the positioning and connection of the protective cover 20 and the resin-sealed housing 12, ensuring the reliability and stability of the connection between the resin-sealed housing 12 and the protective cover 20.

[0038] Selectively, the number of third positioning protrusions, fourth positioning protrusions, third positioning grooves, and fourth positioning grooves can be adjusted according to the actual situation.

[0039] As shown in Figures 5 to 7, Embodiment 2 of the present invention provides an electronic expansion valve that differs from the above embodiment 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 the 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 and second through holes constitute a mounting hole 11, a 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 structured. With this configuration, the hard seal member 30 and the annular member 122 are integrally processed and molded, making processing of the hard seal member 30 easier. 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 welded together.

[0040] Specifically, the injection-molded housing 121 has a first mounting groove surrounding the mounting hole 11 at one end facing the annular member 122, 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 located in 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 restricting structure 123 provided on the injection-molded housing 121, and the annular member 122 further includes a second restricting structure 1223 provided on the first annular plate 1221, the first restricting structure 123 and the second restricting structure 1223 are restrictedly engaged.

[0041] In this embodiment, the second annular plate 1222 of the annular member 122 is provided in the first mounting groove and is restrictedly engaged with the first mounting groove to facilitate the mounting positioning of the annular member 122. The first annular plate 1221 and the injection-molded housing 121 are in contact with and restrictedly engaged by the first restricting structure 123 and the second restricting structure 1223, thereby further improving the positioning accuracy of the annular member 122 and ensuring the reliability of mounting and the stability of the connection between the annular member 122 and the injection-molded housing 121.

[0042] Selectively, the injection-molded housing 121 and the first limiting structure 123 are integrated, and the annular member 122 and the second limiting structure 1223 are integrated. 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 projection 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 projection 12231 and a second positioning groove 12232 provided on the first annular plate 1221, where the second positioning projection 12231 is provided in the first positioning groove and the first positioning projection is provided in the second positioning groove 12232. With this configuration, the limiting engagement between the positioning projection and the positioning groove completes the positioning of the injection-molded housing 121 and the first annular plate 1221, improving the accuracy of mounting and the reliability of positioning. Specifically, as shown in Figure 3, in this embodiment, both the first positioning projection and the second positioning projection 12231 are annular projections, both the first positioning groove and the second positioning groove 12232 are annular grooves, both the first positioning groove and the second positioning projection 12231 are two in number, the first positioning projection is provided between the two first positioning grooves, and the second positioning groove 12232 is provided between the two second positioning projections 12231, thereby further ensuring the reliability and stability of the connection between the injection-molded housing 121 and the first annular plate 1221.

[0044] Selectively, the number of the first positioning projection, the second positioning projection 12231, the first positioning groove, and the second positioning groove 12232 can be adjusted according to the actual situation.

[0045] As shown in Figures 8 and 9, Embodiment 3 of the present invention provides an electronic expansion valve that differs from the above embodiment 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 constitute a mounting hole 11, and the valve body assembly 40 includes a sleeve 41 and a valve body portion 42 connected to each other, the sleeve 41 partially passing through the first mounting groove and inserted into the first through hole, the hard seal member 30 is fitted to the outer wall of the sleeve 41, or the hard seal member 30 and the sleeve 41 are an integral structure, and the hard seal member 30 and the inner wall of the first mounting groove are sealed and engaged. By providing the components in this manner, the hard seal member 30 and the sleeve 41 can be manufactured and provided as a single unit, which facilitates quick processing of the hard seal member 30. Alternatively, the hard seal member 30 and the sleeve 41 can be manufactured separately and fixedly connected, which makes it easier to simultaneously ensure the structural strength of both the hard seal member 30 and the sleeve 41. Furthermore, by providing the hard seal member 30 in the first mounting groove and sealing it with the first mounting groove, a sealing effect is ensured against the gap between the mounting hole 11 of the hard seal member 30 and the sleeve 41, thereby ensuring the reliability of the seal.

[0046] As shown in Figure 10, Embodiment 4 of the present invention provides an electronic expansion valve that differs from the above embodiment in that 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 integrally structured. This configuration facilitates the processing of the protective cover 20.

[0047] As shown in Figure 11, Embodiment 5 of the present invention provides an electronic expansion valve that differs from the above embodiment in that the protective cover 20 is an integral structure and further includes a protective sleeve 24 connected to the sealing head 21, the protective sleeve 24 has a first housing chamber, the coil assembly 10 is provided in the first housing chamber, the sealing head 21 has a second housing chamber, and the second housing chamber communicates with the mounting hole 11. With this configuration, the protective cover 20 provides protection for the entire coil assembly 10, improves the reliability of the coil assembly 10, and ensures the performance of the electronic expansion valve.

[0048] The foregoing describes preferred embodiments of this application and is not intended to limit it. Those skilled in the art will know that this application is subject to various modifications and changes. Any modifications, equivalent substitutions, improvements, etc., made within the scope of the intent and principles of this application should be included within the scope of protection of this application.

Claims

1. A coil assembly (10) having mounting holes (11), A valve body assembly (40) in which a portion is inserted into the mounting hole (11), The hard seal member (30) is provided in the gap between the inner wall of the mounting hole (11) and the outer wall of the valve body assembly (40), and is sealed and engaged with both the valve body assembly (40) and the mounting hole (11), An electronic expansion valve, wherein the valve body assembly (40) includes a sleeve (41) and a valve body portion (42) connected to each other, the sleeve (41) being partially inserted into the mounting hole (11), and the hard seal member (30) is an annular boss, the annular boss being located between the inner wall of the mounting hole (11) and the outer wall of the sleeve (41), and provided on the inner wall of one end of the mounting hole (11) toward the valve body portion (42) and sealed with the outer wall of the sleeve (41), or provided on the outer wall of the sleeve (41) toward the valve body portion (42) and sealed with the inner wall of the mounting hole (11).

2. A coil assembly (10) having mounting holes (11), A valve body assembly (40) in which a portion is inserted into the mounting hole (11), The hard seal member (30) is provided in the gap between the inner wall of the mounting hole (11) and the outer wall of the valve body assembly (40), and is sealed and engaged with both the valve body assembly (40) and the mounting hole (11), 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 the mounting hole (11), and the hard seal member (30) and the resin-sealed housing (12) are integrally structured, in an electronic expansion valve.

3. A coil assembly (10) having mounting holes (11), A valve body assembly (40) in which a portion is inserted into the mounting hole (11), The hard seal member (30) is provided in the gap between the inner wall of the mounting hole (11) and the outer wall of the valve body assembly (40), and is sealed and engaged with both the valve body assembly (40) and the mounting hole (11), 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 within the 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 and second through holes constitute 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 structured, an electronic expansion valve.

4. The injection-molded housing (121) has a first mounting groove at one end facing the annular member (122) that surrounds 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), and the second annular plate (1222) is located within the first mounting groove. The electronic expansion valve according to claim 3, wherein the first annular plate (1221) is in contact with the injection-molded housing (121), the resin-sealed housing (12) further includes a first restricting structure (123) provided on the injection-molded housing (121), the annular member (122) further includes a second restricting structure (1223) provided on the first annular plate (1221), and the first restricting structure (123) and the second restricting structure (1223) are restricted-engaged.

5. The electronic expansion valve according to claim 4, wherein the first limiting structure (123) includes a first positioning projection 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) toward the second annular plate (1222) and includes a second positioning projection (12231) and a second positioning groove (12232) provided on the first annular plate (1221), wherein the second positioning projection (12231) is provided in the first positioning groove and the first positioning projection is provided in the second positioning groove (12232).

6. A coil assembly (10) having mounting holes (11), A valve body assembly (40) in which a portion is inserted into the mounting hole (11), The hard seal member (30) is provided in the gap between the inner wall of the mounting hole (11) and the outer wall of the valve body assembly (40), and is sealed and engaged with both the valve body assembly (40) and the mounting hole (11), The coil assembly (10) includes an injection-molded housing (121), the injection-molded housing (121) having a first through hole and a first mounting groove surrounding the first through hole, the first through hole and the first mounting groove constituting the mounting hole (11), the valve body assembly (40) includes a sleeve (41) and a valve body portion (42) connected to each other, the sleeve (41) having a portion that penetrates the first mounting groove and is inserted into the first through hole, the hard seal member (30) being fitted to the outer wall of the sleeve (41), or the hard seal member (30) and the sleeve (41) being an integral structure, and the hard seal member (30) being sealed and engaged with the inner wall of the first mounting groove, the electronic expansion valve.

7. A coil assembly (10) having mounting holes (11), A valve body assembly (40) in which a portion is inserted into the mounting hole (11), The hard seal member (30) is provided in the gap between the inner wall of the mounting hole (11) and the outer wall of the valve body assembly (40), and is sealed and engaged with both the valve body assembly (40) and the mounting hole (11), Further including a protective cover (20), the protective cover (20) is connected to the coil assembly (10) and includes a sealing head (21), the sealing head (21) seals one opening of the mounting hole (11), An electronic expansion valve, wherein 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) having 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) being inserted into the second mounting groove, the annular limiting plate (22) being in contact with 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), the third limiting structure (14) and the fourth limiting structure (23) being restrictedly engaged.

8. A coil assembly (10) having mounting holes (11), A valve body assembly (40) in which a portion is inserted into the mounting hole (11), The hard seal member (30) is provided in the gap between the inner wall of the mounting hole (11) and the outer wall of the valve body assembly (40), and is sealed and engaged with both the valve body assembly (40) and the mounting hole (11), Further including a protective cover (20), the protective cover (20) is connected to the coil assembly (10) and includes a sealing head (21), the sealing head (21) seals one opening of the mounting hole (11), 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 integrally structured, in an electronic expansion valve.

9. A coil assembly (10) having mounting holes (11), A valve body assembly (40) in which a portion is inserted into the mounting hole (11), The hard seal member (30) is provided in the gap between the inner wall of the mounting hole (11) and the outer wall of the valve body assembly (40), and is sealed and engaged with both the valve body assembly (40) and the mounting hole (11), Further including a protective cover (20), the protective cover (20) is connected to the coil assembly (10) and includes a sealing head (21), the sealing head (21) seals one opening of the mounting hole (11), An electronic expansion valve, wherein the protective cover (20) is integrally constructed and further includes a protective sleeve (24) connected to the sealing head (21), the protective sleeve (24) having a first housing chamber, the coil assembly (10) being provided within the first housing chamber, and the sealing head (21) having a second housing chamber, the second housing chamber communicating with the mounting hole (11).

10. The electronic expansion valve according to any one of claims 1 to 9, wherein the hard seal member (30) is provided on the inner wall of the mounting hole (11), and if the radial dimension of the hard seal member (30) is D1 and the radial dimension of the mounting hole (11) is D3, then D3 - D1 < 0.2 mm.

11. The electronic expansion valve according to claim 10, wherein the radial dimension of the hard seal member (30) is D1, and the outer diameter of the portion of the valve body assembly (40) and the hard seal member (30) that are sealed together is D2, such that D2 ≤ D1.

12. The electronic expansion valve according to claim 10, wherein, 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 the hard seal member (30) has a second chamfer (32) on the side facing the valve body assembly (40), and where L1 is the radial width of the first chamfer (31) on the hard seal member (30), L1 < (D3 - D1) / 2.

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