Electronic expansion valve

Abstract

The present application provides an electronic expansion valve, comprising: a valve body; a sleeve disposed on the valve body; a coil component comprising an encapsulation layer and a coil assembly, the encapsulation layer wrapping the coil assembly, the coil component being provided with a through hole, and the through hole being used for allowing the sleeve to penetrate through; a sealing part disposed between the coil component and the sleeve, the sealing part being sleeved on the outer side of the sleeve, and the sealing part being used for sealing the gap between the coil component and the sleeve; and a fixing part, one end of the fixing part being connected to the sealing part, and the other end of the fixing part being connected to the valve body. The present solution can solve the problem in the prior art of the service life of a sealing ring being affected due to welding of a blocking ring and a coil component.

Description

Electronic expansion valve

[0001] This application claims priority to the patent application filed with the State Intellectual Property Office of China on November 20, 2023, with application number 2023115508523 and invention name “Electronic Expansion Valve”. Technical Field

[0002] The present application relates to the field of electronic expansion valves, and in particular, to an electronic expansion valve. Background Art

[0003] Existing electronic expansion valves typically include a valve body assembly and a coil component. The valve body assembly includes a valve body and a sleeve mounted on the valve body. The coil component is provided with a through-hole, and the sleeve is inserted into the through-hole. After the sleeve is inserted into the through-hole, a gap exists between the coil component and the sleeve. This gap allows water to enter the coil component along the outer wall of the sleeve and into the interior of the coil component. Prolonged contact with water can corrode components within the coil component, shortening their service life.

[0004] The electronic expansion valve also includes a sealing ring and a blocking ring. The sealing ring is mounted on the sleeve and located at the opening of the perforation. The sealing ring is used to seal the gap between the coil assembly and the sleeve. The blocking ring is mounted on the sleeve and located on the side of the sealing ring closest to the valve body. The blocking ring is welded to the end face of the coil assembly closest to the valve body and limits the sealing ring. However, the above solution affects the microstructure of the sealing ring during the welding process between the blocking ring and the coil assembly, which in turn affects the service life of the sealing ring and its sealing effect. Summary of the Invention

[0005] The present application provides an electronic expansion valve to solve the problem in the prior art of welding a sealing ring and a coil component, which affects the service life of the sealing ring.

[0006] The present application provides an electronic expansion valve, which includes a valve body; a sleeve, which is arranged on the valve body; a coil component, which includes an encapsulation layer and a coil assembly, the encapsulation layer wraps the coil assembly, and the coil component has a penetration hole, and the penetration hole is used for the sleeve to penetrate; a sealing part, which is arranged between the coil component and the sleeve, and the sealing part is sleeved on the outside of the sleeve, and the sealing part is used to seal the gap between the coil component and the sleeve; a fixing part, one end of the fixing part is connected to the sealing part, and the other end is connected to the valve body.

[0007] By applying the technical solution of the present application, the fixing part and the sealing part are detachably connected. Such a setting can facilitate the fixation of the position of the sealing part and avoid damaging the structure of the sealing part itself. In the traditional technical solution, the sealing ring is usually arranged at the installation port of the shell of the coil assembly, and a sealing ring is welded at the installation port to limit the position of the sealing ring. However, the welding process usually destroys the microstructure of the sealing ring and affects the sealing effect of the sealing ring. In the setting of the present application, the sealing part is connected to the fixing part, and is fixedly connected to the valve body through the fixing part to limit the position of the sealing part. With such a setting, it is possible to avoid implementing the welding process at a position close to the sealing part, thereby avoiding the situation where the welding process destroys the microstructure of the sealing part, improving the sealing effect of the sealing part and extending the service life of the sealing part.

[0008] Furthermore, the sealing portion and the fixing portion are separately provided, and the sealing portion and the fixing portion are detachably connected.

[0009] Furthermore, the sealing portion is snap-fitted with the fixing portion.

[0010] Furthermore, a clamping groove is provided on the outer side wall of the sealing portion, and the fixing portion includes a clamping end, which is clamped and matched with the sealing portion through the clamping groove.

[0011] Furthermore, the fixing portion includes a fixing ring, and the inner edge of the fixing ring forms a clamping end.

[0012] Furthermore, the sealing portion is made of elastic material, extends along the inner edge of the fixing ring to form an annular structure, and the clamping groove is provided on the outer side wall of the sealing portion.

[0013] Furthermore, the sealing portion includes a sealing strip, and a clamping groove is provided on the side wall of the sealing strip facing the fixing ring.

[0014] Furthermore, the total length of the sealing strip is less than or equal to the circumference of the inner side wall of the fixing ring.

[0015] Furthermore, the sealing portion includes a sealing sheet, which is made of an elastic material. The sealing sheet is arranged in a ring shape along the circumference of the fixing ring inside the fixing ring. Along the axial direction of the fixing ring, the two ends of the sealing sheet are respectively located on both sides of the fixing ring. The two ends of the sealing sheet are respectively bent toward the outer edge of the fixing ring and form a first bending ring and a second bending ring respectively. The space between the first bending ring and the second bending ring forms a snap-fit ​​groove.

[0016] Furthermore, the sealing portion includes a sealing ring, and a clamping groove is provided on the outer side wall of the sealing ring. The circumference of the clamping groove is less than or equal to the circumference of the inner side wall of the fixing ring.

[0017] Furthermore, the first end of the sealing portion is inserted into the penetration hole, and the second end of the sealing portion is located outside the penetration hole.

[0018] Furthermore, the through hole includes a first hole section and a second hole section connected in sequence along the axial direction, the diameter of the second hole section is larger than the diameter of the first hole section, the end of the second hole section away from the first hole section extends to the end surface of the encapsulation layer close to the valve body, and the first end of the sealing part is penetrated in the second hole section.

[0019] Furthermore, the sealing portion has a sealing end surface and a sealing side surface, the sealing end surface is in abutment with the coil assembly, and the sealing side surface is in abutment with the side wall of the sleeve.

[0020] Furthermore, the sealing portion is located outside the coil component, and has a sealing end face and a sealing side face. The sealing end face abuts against the end face of the envelope layer close to the valve body, and the sealing side face abuts against the side wall of the sleeve.

[0021] Furthermore, the sealing end surface is a plane or a curved surface.

[0022] Furthermore, the snap-fit ​​groove has a first side wall and a second side wall arranged opposite to each other along the direction from the sleeve to the valve body, the first side wall is flush with the end face of the encapsulating layer close to the valve body, and the fixing ring is a planar plate structure, and the fixing ring abuts against the end face of the encapsulating layer close to the valve body.

[0023] Furthermore, along the axial direction of the sealing portion, there is a spacing between the snap-fit ​​groove and the end face of the sealing layer close to the valve body. The fixing ring includes an abutting ring, a connecting ring and a snap-fit ​​ring connected in sequence from the outside to the inside. The inner edge of the connecting ring and the outer edge of the connecting ring have a spacing in the axial direction. The abutting ring abuts against the end face of the sealing layer close to the valve body, and the inner edge of the snap-fit ​​ring forms a snap-fit ​​end.

[0024] Furthermore, the cross-sectional shape of the clamping groove is one of rectangular, trapezoidal or U-shaped.

[0025] Furthermore, the sealing portion and the fixing portion are an integrally formed structure.

[0026] Furthermore, a chamfered structure is provided at a connection position between the end surface of the sealing portion and the outer side wall of the sealing portion.

[0027] Furthermore, the electronic expansion valve further comprises: a waterproof structure, the cover being arranged outside the sleeve, the encapsulation layer being sealed with the waterproof structure and the sealing portion respectively, and the waterproof structure and the encapsulation layer being an integrally formed or separately formed structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings that constitute part of this application are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0029] FIG1 shows a schematic structural diagram of an electronic expansion valve according to a first embodiment of the present application;

[0030] FIG2 shows a schematic structural diagram of a coil component provided according to Embodiment 1 of the present application;

[0031] FIG3 shows a cross-sectional view of an electronic expansion valve according to the first embodiment of the present application from one viewing angle;

[0032] FIG4 shows a cross-sectional view of the electronic expansion valve provided in accordance with the first embodiment of the present application from another perspective;

[0033] FIG5 shows a schematic diagram of the local structure of point A in FIG4 ;

[0034] FIG6 shows a schematic structural diagram of a sealing portion according to the first embodiment of the present application;

[0035] FIG7 shows a front view of the sealing portion in FIG6 ;

[0036] FIG8 shows a cross-sectional view of the sealing portion in FIG6 ;

[0037] FIG9 shows a schematic structural diagram of another sealing portion provided according to Example 1 of the present application;

[0038] FIG10 shows a front view of the sealing portion in FIG9 ;

[0039] FIG11 shows a cross-sectional view of the sealing portion in FIG9 ;

[0040] FIG12 shows a schematic structural diagram of another sealing portion provided according to Example 1 of the present application;

[0041] FIG13 shows a front view of the sealing portion in FIG12;

[0042] FIG14 shows a cross-sectional view of the sealing portion in FIG12 ;

[0043] FIG15 shows a schematic structural diagram of another sealing portion provided according to Example 1 of the present application;

[0044] FIG16 shows a front view of the sealing portion in FIG15 ;

[0045] FIG17 shows a cross-sectional view of the sealing portion in FIG15 ;

[0046] FIG18 shows a schematic structural diagram of another sealing portion provided according to Example 1 of the present application;

[0047] FIG19 shows a front view of the sealing portion in FIG18;

[0048] FIG20 shows a cross-sectional view of the sealing portion in FIG18;

[0049] FIG21 shows a front view of a sealing strip provided according to the first embodiment of the present application;

[0050] FIG22 shows a side view of a sealing strip provided according to the first embodiment of the present application;

[0051] FIG23 shows a schematic structural diagram of a sealing sheet provided according to Example 1 of the present application;

[0052] FIG24 shows a cross-sectional view of an electronic expansion valve provided according to the second embodiment of the present application;

[0053] FIG. 25 is a schematic diagram showing the local structure of point B in FIG. 24 .

[0054] The above drawings include the following reference numerals:

[0055] 10. Valve body;

[0056] 20. Casing;

[0057] 30. Encapsulation layer;

[0058] 40. Coil assembly;

[0059] 401, drilling holes;

[0060] 4011, first hole section; 4012, second hole section;

[0061] 50, sealing portion; 501, snap-fit ​​groove; 502, sealing end surface; 503, sealing side surface;

[0062] 60. Fixed part;

[0063] 61. Fixing ring; 62. Fixing plate;

[0064] 611, abutting ring; 612, connecting ring; 613, snap ring;

[0065] 70. Waterproof structure. DETAILED DESCRIPTION

[0066] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0067] As shown in Figures 1 to 5, the present application provides an electronic expansion valve, which includes a valve body 10, a sleeve 20, a coil component and a sealing portion 50. The sleeve 20 is arranged on the valve body 10. The coil component includes an encapsulation layer 30 and a coil assembly 40. The encapsulation layer 30 wraps the coil assembly 40. The coil component has a penetration hole 401, and the penetration hole 401 is used for the sleeve 20 to pass through. The sealing portion 50 is arranged between the coil component and the sleeve 20. The sealing portion 50 is sleeved on the outside of the sleeve 20. The sealing portion 50 is used to seal the gap between the coil component and the sleeve 20. One end of the fixing portion 60 is connected to the sealing portion 50, and the other end is connected to the valve body 10. Among them, the coil assembly 40 includes claw poles, stator pole plates, windings, and stator housings arranged in pairs. The aforementioned coil assembly 40 is injection-molded and encapsulated by an injection molding process to form an encapsulation layer 30.

[0068] By applying the technical solution of the present application, the fixing portion 60 is detachably connected to the sealing portion 50. Such a setting can facilitate the fixation of the position of the sealing portion 50 and avoid damaging the structure of the sealing portion 50 itself. In the traditional technical solution, the sealing ring is usually arranged at the installation port of the shell of the coil assembly, and a sealing ring is welded at the installation port to limit the position of the sealing ring. However, the welding process usually destroys the microstructure of the sealing ring and affects the sealing effect of the sealing ring. In the setting of the present application, the sealing portion 50 is connected to the fixing portion 60, and is fixedly connected to the valve body 10 through the fixing portion 60 to limit the position of the sealing portion 50. Such a setting can avoid the implementation of the welding process at a position close to the sealing portion 50, thereby avoiding the situation where the welding process destroys the microstructure of the sealing portion 50, improving the sealing effect of the sealing portion 50 and extending the service life of the sealing portion 50.

[0069] This solution does not limit the specific connection method between the sealing part 50 and the fixing part 60.

[0070] In some embodiments of this solution, the sealing portion 50 and the fixing portion 60 may be provided as an integrally formed structure. Specifically, in this case, the fixing portion 60 may be provided with a circular hole structure, and the sealing portion 50 may be injection molded along the circumference of the circular hole structure or fused to the hole wall of the circular hole structure.

[0071] In this embodiment, the sealing portion 50 and the fixing portion 60 are provided separately and are detachably connected to each other. This solution does not limit the specific connection method of the sealing portion 50 and the fixing portion 60, wherein the connection can be made by fasteners, snap-fitting or plug-in connection.

[0072] In this embodiment, the sealing portion 50 and the fixing portion 60 engage with each other in a snap-fit ​​arrangement. This arrangement utilizes the inherent structure of the sealing portion 50 and the fixing portion 60 to achieve interconnection between them, eliminating the need for additional fasteners to secure the two, thereby reducing the number of components in this electronic expansion valve. Furthermore, this arrangement facilitates both securement and removal of the sealing portion 50 and the fixing portion 60.

[0073] Furthermore, a snap-fit ​​groove 501 is provided on the outer side wall of the sealing portion 50, and the fixing portion 60 includes a snap-fit ​​end, which snaps into engagement with the sealing portion 50 via the snap-fit ​​groove 501. Providing the snap-fit ​​groove 501 on the outer side wall of the sealing portion 50 simplifies the structure and facilitates processing of the snap-fit ​​groove 501.

[0074] This solution does not limit the specific number of the engaging grooves 501, as long as the engaging ends are engaged with the engaging grooves 501. A plurality of engaging grooves 501 can be provided at intervals along the circumference of the sealing portion 50. In this case, the engaging ends can be provided in the form of a plurality of protruding structures that engage with the corresponding engaging grooves 501.

[0075] In this embodiment, there is one clamping groove 501 , and the clamping groove 501 is annularly arranged on the outer side wall of the sealing portion 50 along the circumference of the sealing portion 50 , that is, the clamping groove 501 is a closed annular structure.

[0076] Specifically, the fixing portion 60 includes a fixing ring 61, the inner edge of which forms a snap-fit ​​end. This arrangement ensures that the entire inner edge of the fixing ring 61 is located within the snap-fit ​​groove 501, increasing the contact area between the fixing ring 61 and the snap-fit ​​groove 501, thereby improving the stability of the connection between the sealing portion 50 and the fixing portion 60. Furthermore, this arrangement ensures that the fixing ring 61 can support the entire periphery of the sealing portion 50 along its circumference, ensuring the structural stability of the sealing portion 50, reducing deformation of the sealing portion 50, and further improving the sealing effect of the sealing portion 50.

[0077] Furthermore, the electronic expansion valve includes a circumferential limiting structure disposed between the retaining ring 61 and the encapsulating layer 30. This structure is used to define the relative circumferential position of the retaining ring 61 and the encapsulating layer 30. This arrangement improves the stability of the retaining ring 61, reduces the risk of rotation, and enhances the stability of the sealing portion 50.

[0078] In some embodiments of this solution, the circumferential limiting structure includes a limiting post and a limiting hole that cooperate with each other to limit each other. The limiting post is provided on the end face of the encapsulation layer 30 close to one end of the valve body, and the limiting hole is provided on the fixing ring 61.

[0079] In some other embodiments of the present scheme, the circumferential limiting structure includes a limiting column and a limiting groove that cooperate with each other to limit each other. The limiting groove is arranged on the end face of the encapsulating layer 30 close to one end of the valve body, and the limiting column is arranged on the end face of the fixing ring 61 away from the fixing plate 62.

[0080] In this solution, the fixing portion 60 also includes a fixing plate 62, the extension direction of which is the same as the axial direction of the fixing ring 61. One end of the fixing plate 62 is arranged at the outer edge of the fixing ring 61, and the other end of the fixing plate 62 extends toward one side of the axial direction of the fixing ring 61 and is fixedly connected to the valve body 10.

[0081] The present solution does not limit the specific connection method between the fixing plate 62 and the valve body 10, wherein the connection method between the two includes but is not limited to welding, clamping or connection via fasteners.

[0082] In this embodiment, a mounting hole is provided at one end of the fixing plate 62 away from the fixing ring 61 . The electronic expansion valve further includes a fastener provided corresponding to the mounting hole. The valve body 10 and the fixing plate 62 are fixedly connected by the fastener.

[0083] Furthermore, the sealing portion 50 is made of an elastic material and extends along the inner edge of the retaining ring 61 to form an annular structure. A snap-fit ​​groove 501 is provided on the outer sidewall of the sealing portion 50. After the electronic expansion valve is assembled, the sealing portion 50 is compressed by other components. Because the sealing portion 50 is made of an elastic material, it has a certain amount of deformation margin, which ensures a tight fit between the sealing portion 50, the sleeve, and the coil assembly 40, further enhancing the sealing effect of the sealing portion 50.

[0084] As shown in FIG. 5 to FIG. 23 , this solution does not limit the specific form of the sealing portion 50 .

[0085] As shown in Figures 5 to 20, in some embodiments of the present solution, the sealing portion 50 includes a sealing ring, and a snap-fit ​​groove 501 is provided on the outer wall of the sealing ring. The circumference of the snap-fit ​​groove 501 is less than or equal to the circumference of the inner wall of the fixing ring 61.

[0086] As shown in FIG. 21 and FIG. 22 , in some other embodiments of the present solution, the sealing portion 50 includes a sealing strip, and a snap-fit ​​groove 501 is provided on the side wall of the sealing strip facing the fixing ring 61 .

[0087] When the sealing portion 50 includes a sealing strip, the extending direction of the snap-in groove 501 is the same as the extending direction of the sealing strip, and the two ends of the snap-in groove 501 in the length direction are open. Specifically, when the sealing strip and the fixing portion 60 are assembled, the sealing strip is wound around the fixing ring 61 along the inner edge of the fixing ring 61, and the inner edge of the fixing ring 61 is embedded in the snap-in groove 501 of the sealing strip. After assembly, there is a certain gap between the two ends of the sealing strip, leaving deformation space for the deformation of the sealing strip. Such an arrangement can facilitate the processing of the sealing portion 50, and the cutting length of the sealing portion 50 can be determined according to the diameter of the fixing ring 61, thereby improving the adaptability of this solution.

[0088] Furthermore, the total length of the sealing strip is less than or equal to the circumference of the inner wall of the retaining ring 61. This arrangement allows the various components to squeeze the sealing strip after the electronic expansion valve is assembled, finalizing its shape. That is, when the sealing strip is assembled with the retaining ring 61, the two free ends of the sealing strip do not need to be connected in a specific manner; it only needs to ensure that, after the sealing strip is squeezed, the two free ends abut against each other, forming a closed ring structure.

[0089] The sealing portion 50 may also include a plurality of sealing strips arranged end to end, in which case it is sufficient to ensure that the plurality of sealing strips arranged end to end form a closed annular structure. The total length of the plurality of sealing strips can be less than or equal to the circumference of the inner side wall of the fixing ring 61.

[0090] As shown in FIG23 , in some other embodiments of the present invention, the sealing portion 50 includes a sealing sheet made of an elastic material. The sealing sheet is annularly arranged within the fixing ring 61 along the circumference of the fixing ring 61. Along the axial direction of the fixing ring 61, the two ends of the sealing sheet are located on either side of the fixing ring 61. The two ends of the sealing sheet are bent toward the outer edge of the fixing ring 61 to form a first bending ring and a second bending ring, respectively. The space between the first bending ring and the second bending ring forms a snap-fit ​​groove 501. By configuring the sealing portion 50 as a sealing sheet, the radial dimensions of the first bending ring and the second bending ring can be varied according to the width of the sealing sheet, making it easier for the sealing sheet to adapt to fixing rings 61 of different sizes. Furthermore, the sealing sheet form is simpler to process.

[0091] Specifically, when assembling the sealing sheet and the fixing ring 61, the sealing sheet is annularly arranged inside the fixing ring 61 along the circumference of the fixing ring 61, with the two ends of the sealing sheet abutting against each other. The two ends of the sealing sheet are respectively located on either side of the fixing ring 61 along the axial direction of the fixing ring 61. The two ends of the sealing sheet are bent toward the outer edge of the fixing ring 61 to form a first bent ring and a second bent ring, respectively. The space between the first bent ring and the second bent ring forms the engaging groove 501. Afterwards, the sealing sheet can be shaped.

[0092] This solution does not limit the specific form of shaping the sealing sheet, which includes but is not limited to forms of fixing by heat treatment and glue.

[0093] Similarly, when the sealing portion 50 includes a sealing sheet, the total length of the sealing sheet is less than or equal to the circumference of the inner sidewall of the fixing ring 61 .

[0094] The sealing portion 50 may also include a plurality of sealing sheets arranged end to end, in which case the plurality of sealing sheets arranged end to end form a closed annular structure, and the total circumference of the plurality of sealing sheets arranged end to end may be less than or equal to the circumference of the inner side wall of the fixing ring 61.

[0095] This solution does not limit the specific position of the sealing portion 50.

[0096] As shown in FIG. 3 to FIG. 5 , in some embodiments of the present solution, the first end of the sealing portion 50 is inserted into the penetration hole 401 , and the second end of the sealing portion 50 is located outside the penetration hole 401 .

[0097] Specifically, the perforation 401 includes a first hole section 4011 and a second hole section 4012, which are sequentially connected along the axial direction. The diameter of the second hole section 4012 is larger than that of the first hole section 4011. The end of the second hole section 4012, distal from the first hole section 4011, extends to the end surface of the encapsulation layer 30 adjacent to the valve body 10. The first end of the sealing portion 50 is disposed within the second hole section 4012. Specifically, the first hole section 4011 is disposed on the coil assembly 40, and the second hole section 4012 is disposed on the encapsulation layer 30. The first end of the sealing portion 50 abuts the stator housing of the coil assembly 40. This arrangement improves the stability and sealing effectiveness of the sealing portion 50.

[0098] As shown in Figures 1 to 5 , the sealing portion 50 specifically includes a sealing end surface 502 and a sealing side surface 503. The sealing end surface 502 abuts against the coil assembly 40, while the sealing side surface 503 abuts against the sidewall of the sleeve 20. This arrangement allows the sealing portion 50 to abut against the coil assembly 40 and the sleeve 20, respectively, achieving radial and axial sealing of the coil component, further improving the sealing performance of the sealing portion 50.

[0099] In this embodiment, the sealing side surface 503 is an annular structure, which is coaxially arranged with the sleeve 20, and the sealing side surface 503 is tightly fitted with the sleeve 20. Such an arrangement can ensure a sealing effect between the sealing side surface 503 and the sleeve 20.

[0100] This solution does not limit the specific form of the sealing end surface 502, wherein the sealing end surface 502 can be set to a flat surface or a curved surface.

[0101] As shown in FIG. 5 , this solution does not limit the specific shape of the fixing ring 61 .

[0102] In some embodiments of the present scheme, the snap-in groove 501 has a first side wall and a second side wall arranged opposite to each other along the direction from the sleeve 20 to the valve body 10, the first side wall is flush with the end face of the encapsulating layer 30 close to the valve body 10, and the fixing ring 61 is a planar plate structure, and the fixing ring 61 abuts against the end face of the encapsulating layer 30 close to the valve body 10.

[0103] As shown in FIG. 5 to FIG. 20 , this solution does not limit the specific shape of the snap-fit ​​groove 501 .

[0104] In some embodiments of this solution, the cross-section of the clamping groove 501 is rectangular, which facilitates the processing and forming of the clamping groove 501 .

[0105] In other embodiments of this solution, the cross-section of the engaging groove 501 is configured to be trapezoidal, and along the axis of the sealing portion 50, the engaging groove 501 has two opposing side walls, with the spacing between the two side walls gradually increasing from the center to the edge of the sealing portion 50. This configuration facilitates assembly of the sealing portion 50 and the fixing ring 61.

[0106] In some other embodiments of the present solution, the cross-sectional shape of the snap-fit ​​groove 501 is set to be U-shaped.

[0107] In this embodiment, the sealing portion 50 can be configured as a symmetrical structure or an asymmetrical structure. When the sealing portion 50 is a symmetrical structure, the structures of the two end surfaces of the sealing portion 50 are the same. When the sealing portion 50 is an asymmetrical structure, the structures of the two end surfaces of the sealing portion 50 are different.

[0108] In this embodiment, the sealing portion 50 has a symmetrical structure, that is, the structures of the two end surfaces of the sealing portion 50 are identical. This eliminates the need to distinguish the orientations of the two end surfaces of the sealing portion 50 when assembling the sealing portion 50 and the fixing ring 61, ensuring ease of assembly of the sealing portion 50 and the fixing ring 61, and also ensuring ease of machining the sealing portion 50 itself.

[0109] Furthermore, a chamfered or rounded structure is provided at the connection position between the end surface of the sealing portion 50 and the outer side wall of the sealing portion 50. This arrangement reduces the possibility of tearing at the edge of the sealing portion 50 and further improves the structural strength of the sealing portion 50.

[0110] As shown in Figures 1 to 3, the electronic expansion valve further includes a waterproof structure 70, which is disposed over the sleeve 20. The encapsulation layer 30 seals against the waterproof structure 70 and the sealing portion 50. This arrangement enables the waterproof structure 70, the coil assembly, and the sealing portion 50 to form a closed cavity, thereby reducing or preventing the ingress of external moisture. Furthermore, this arrangement prevents the formation of condensed water.

[0111] This solution does not limit the specific connection method between the waterproof structure 70 and the encapsulation layer 30.

[0112] In some embodiments of the present solution, the waterproof structure 70 and the encapsulation layer 30 are an integrally formed structure, that is, the waterproof structure 70 is formed by an injection molding process.

[0113] In some other embodiments of the present solution, the waterproof structure 70 and the encapsulation layer 30 are separate structures, and the waterproof structure 70 can be fixedly connected to the encapsulation layer 30 by fasteners or snap-fitting.

[0114] As shown in FIG24 and FIG25 , the second embodiment of this solution provides an electronic expansion valve, which differs from the first embodiment in that:

[0115] The diameter of the perforated hole 401 is uniform along its axis. The sealing portion 50 is located outside the coil component and has a sealing end face 502 and a sealing side face 503. The sealing end face 502 abuts against the end face of the encapsulating layer 30 near the valve body 10, while the sealing side face 503 abuts against the side wall of the sleeve 20. This arrangement facilitates assembly of the sealing portion 50.

[0116] Along the axial direction of the sealing portion 50, there is a distance between the snap-fit ​​groove 501 and the end face of the sealing layer 30 close to the valve body 10. The fixing ring 61 includes an abutting ring 611, a connecting ring 612 and a snap-fit ​​ring 613 connected in sequence from the outside to the inside. The inner edge of the connecting ring 612 and the outer edge of the connecting ring 612 have a distance in the axial direction. The abutting ring 611 abuts against the end face of the sealing layer 30 close to the valve body 10, and the inner edge of the snap-fit ​​ring 613 forms a snap-fit ​​end.

[0117] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0118] Unless otherwise specified, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. Technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0119] In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0120] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0121] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0122] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. An electronic expansion valve, characterized in that: include: Valve body (10); A sleeve (20) is arranged on the valve body (10); A coil component, comprising an encapsulation layer (30) and a coil assembly (40), wherein the encapsulation layer (30) encapsulates the coil assembly (40), and the coil component has a penetration hole (401), wherein the penetration hole (401) is used for the sleeve (20) to penetrate; a sealing portion (50) disposed between the coil component and the sleeve (20), the sealing portion (50) being sleeved on the outside of the sleeve (20), and the sealing portion (50) being used to seal the gap between the coil component and the sleeve (20); A fixing part (60), one end of which is connected to the sealing part (50), and the other end of which is connected to the valve body (10).

2. The electronic expansion valve according to claim 1, characterized in that: The sealing portion (50) and the fixing portion (60) are arranged separately, and the sealing portion (50) and the fixing portion (60) are detachably connected.

3. The electronic expansion valve according to claim 2, characterized in that: The sealing portion (50) is snap-fitted with the fixing portion (60).

4. The electronic expansion valve according to claim 3, characterized in that: A snap-fit ​​groove (501) is provided on the outer side wall of the sealing portion (50), and the fixing portion (60) comprises a snap-fit ​​end, and the snap-fit ​​end is snap-fitted with the sealing portion (50) through the snap-fit ​​groove (501).

5. The electronic expansion valve according to claim 4, characterized in that: The fixing portion (60) comprises a fixing ring (61), and the inner edge of the fixing ring (61) forms the clamping end.

6. The electronic expansion valve according to claim 5, characterized in that: The sealing portion (50) is made of an elastic material, and the sealing portion (50) extends along the inner edge of the fixing ring (61) to form an annular structure, and the clamping groove (501) is arranged on the outer side wall of the sealing portion (50).

7. The electronic expansion valve according to claim 6, characterized in that: The sealing portion (50) comprises a sealing strip, and the clamping groove (501) is provided on the side wall of the sealing strip facing the fixing ring (61).

8. The electronic expansion valve according to claim 7, characterized in that: The total length of the sealing strip is less than or equal to the circumference of the inner wall of the fixing ring (61).

9. The electronic expansion valve according to claim 5, characterized in that: The sealing portion (50) comprises a sealing sheet, which is made of an elastic material and is arranged in a ring shape inside the fixing ring (61) along the circumference of the fixing ring (61). Along the axial direction of the fixing ring (61), two ends of the sealing sheet are respectively located on two sides of the fixing ring (61). The two ends of the sealing sheet are respectively bent toward the outer edge of the fixing ring (61) to form a first bending ring and a second bending ring, respectively. The space between the first bending ring and the second bending ring forms the snap-fit ​​groove (501).

10. The electronic expansion valve according to claim 5, characterized in that: The sealing portion (50) comprises a sealing ring, and the clamping groove (501) is provided on the outer side wall of the sealing ring. The circumference of the clamping groove (501) is less than or equal to the circumference of the inner side wall of the fixing ring (61).

11. The electronic expansion valve according to claim 1, characterized in that: The first end of the sealing portion (50) is inserted into the penetration hole (401), and the second end of the sealing portion (50) is located outside the penetration hole (401).

12. The electronic expansion valve according to claim 11, characterized in that: The penetration hole (401) comprises a first hole section (4011) and a second hole section (4012) which are connected in sequence along the axial direction, the diameter of the second hole section (4012) is larger than the diameter of the first hole section (4011), and the end of the second hole section (4012) away from the first hole section (4011) extends to the end surface of the sealing layer (30) close to the valve body (10), and the first end of the sealing portion (50) is penetrated in the second hole section (4012).

13. The electronic expansion valve according to claim 12, characterized in that: The sealing portion (50) has a sealing end surface (502) and a sealing side surface (503); the sealing end surface (502) is in abutment with the coil assembly (40), and the sealing side surface (503) is in abutment with the side wall of the sleeve (20).

14. The electronic expansion valve according to claim 1, characterized in that: The sealing portion (50) is located on the outside of the coil component, and the sealing portion (50) has a sealing end face (502) and a sealing side face (503). The sealing end face (502) abuts against the end face of the sealing layer (30) at one end close to the valve body (10), and the sealing side face (503) abuts against the side wall of the sleeve (20).

15. The electronic expansion valve according to claim 13 or 14, characterized in that: The sealing end surface (502) is a flat surface or a curved surface.

16. The electronic expansion valve according to claim 5, characterized in that: The snap-fit ​​groove (501) has a first side wall and a second side wall which are arranged opposite to each other along the direction from the sleeve (20) to the valve body (10), and the first side wall is flush with the end face of the sealing layer (30) close to the valve body (10). The fixing ring (61) is a planar plate-like structure, and the fixing ring (61) abuts against the end face of the sealing layer (30) close to the valve body (10).

17. The electronic expansion valve according to claim 5, characterized in that: Along the axial direction of the sealing portion (50), there is a spacing between the snap-fit ​​groove (501) and the end face of the sealing layer (30) close to the valve body (10), and the fixing ring (61) includes an abutment ring (611), a connecting ring (612) and a snap-fit ​​ring (613) which are sequentially connected from the outside to the inside, and the inner edge of the connecting ring (612) and the outer edge of the connecting ring (612) are spaced in the axial direction, the abutment ring (611) abuts against the end face of the sealing layer (30) close to the valve body (10), and the inner edge of the snap-fit ​​ring (613) forms the snap-fit ​​end.

18. The electronic expansion valve according to claim 4, characterized in that: The cross-sectional shape of the clamping groove (501) is one of a rectangle, a trapezoid or a U shape.

19. The electronic expansion valve according to claim 1, characterized in that: The sealing portion (50) and the fixing portion (60) are an integrally formed structure.

20. The electronic expansion valve according to claim 1, characterized in that: A chamfered structure is provided at a connection position between the end surface of the sealing portion (50) and the outer side wall of the sealing portion (50).

21. The electronic expansion valve according to claim 1, characterized in that: The electronic expansion valve further comprises: The waterproof structure (70) is covered outside the sleeve (20), and the sealing layer (30) is sealed with the waterproof structure (70) and the sealing portion (50) respectively. The waterproof structure (70) and the sealing layer (30) are integrally formed or separately formed structures.

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