CN110159820B

CN110159820B - Electronic expansion valve

Info

Publication number: CN110159820B
Application number: CN201810139561.8A
Authority: CN
Inventors: 康志军; 林元阳; 柴雪松
Original assignee: Dunan Automotive Thermal Management Technology Co Ltd
Current assignee: Dunan Automotive Thermal Management Technology Co Ltd
Priority date: 2018-02-11
Filing date: 2018-02-11
Publication date: 2022-03-25
Anticipated expiration: 2038-02-11
Also published as: CN110159820A

Abstract

The invention discloses an electronic expansion valve which comprises a coil component and a valve body, wherein the coil component comprises a stator pole plate, a stator shell in conductive contact with the stator pole plate, a non-conductive plastic package shell coated outside the stator shell, the stator shell is provided with a stator shell exposed part exposed outside the plastic package shell, the electronic expansion valve further comprises a positioning sheet in conductive connection with the valve body, the coil component and the positioning sheet are welded and fixed, and the positioning sheet is provided with a conductive contact part in conductive contact with the stator shell. According to the technical scheme, the coil component and the positioning sheet are welded and fixed, compared with a connection mode of encapsulation, the process is simple, the production efficiency is high, in addition, the grounding structure of the coil is simple, and the installation is convenient.

Description

Electronic expansion valve

Technical Field

The invention relates to the technical field of refrigeration air conditioners, in particular to an electronic expansion valve.

Background

In the process of switching on and switching off the coil, the static electricity generated by the stator pole plate and the stator shell of the coil needs to be led out of the coil, otherwise, the possibility of influencing other components exists. Meanwhile, static electricity generated by other electric devices can also affect the stepping motor to cause misoperation.

The chinese patent publication No. CN103016821B discloses an electronic expansion valve, in which the fixation of the grounding clip and the coil is realized by potting material, the potting process is complex, the curing period of the potting material is long, the efficiency is low, and the coil is easily contaminated. And after the encapsulating process is cancelled, the structure can not realize the functions of coil fixing and grounding.

Chinese patent publication No. CN 107620824 a discloses an electronic expansion valve, which is electrically connected to a valve body via a grounding assembly circuit board. The grounding contact pin and the stator shell are welded and then are molded into a coil, so that the complexity of the injection molding process is increased. In addition, the grounding pin and the connecting plate also adopt a welding process. Although the grounding function is realized, the whole structure is complex, the production procedures are multiple, and the processing efficiency is low.

Disclosure of Invention

The invention aims to solve the technical problem of providing an electronic expansion valve, and solves the problems that a grounding structure of a coil component needs to be encapsulated and fixed, the process is complex, and the production period is long.

In order to solve the technical problems, the invention adopts the following technical scheme:

the utility model provides an electronic expansion valve, its includes coil part and valve body, coil part includes stator plate, the stator casing that electrically conducts the contact with the stator plate and the plastic envelope casing of cladding outside the stator casing that does not conduct, the stator casing is equipped with exposes in the outside exposed portion of stator casing of plastic envelope casing, electronic expansion valve still includes the spacer of being connected with the valve body is electrically conducted, coil part and spacer welded fastening, the spacer is equipped with the electrically conductive contact part with the electrically conductive contact of stator casing.

Preferably, the bottom of the coil component is provided with at least two welding posts, the positioning plate is provided with an annular part, and at least two positioning holes which are correspondingly positioned, matched and welded with the at least two welding posts are distributed on the annular part along the circumferential direction.

Preferably, the positioning piece is provided with a fixing part which is connected with the edge of the annular part and extends towards the side face of the valve body, and the fixing part is fixed with the valve body through a screw.

Preferably, a notch is formed at a connecting portion of the fixing portion and the annular portion, and the conductive contact portion extends from the connecting portion of the annular portion and the notch.

Preferably, the conductive contact part is provided with an elastic bending head which is elastically contacted with the stator shell.

Preferably, the plastic package shell is of an integral injection molding structure.

Preferably, an exposed notch for exposing the stator shell is reserved on the side face or the bottom face of the coil component of the plastic package shell.

Preferably, the spacer is fixed to the coil member by ultrasonic or thermal welding.

The invention also provides another electronic expansion valve which comprises a coil component and a valve body, wherein the coil component comprises a stator pole plate, a stator shell in conductive contact with the stator pole plate, a non-conductive plastic package shell covering the stator shell, and a positioning sheet arranged between the coil component and the valve body, the positioning sheet comprises an annular part fixed with the coil component, a fixing part bent and extended from the outer side edge of the annular part and positioned with the valve body, and a conductive contact part arranged on the fixing part, and the conductive contact part is bent and extended from the outer side edge of the annular part opposite to the fixing part and is contacted with the stator shell.

Preferably, the conductive contact portion is punched from the fixing portion and is in elastic contact with the stator housing.

According to the technical scheme, firstly, the coil component and the positioning sheet are welded and fixed, and compared with a connecting mode of encapsulation, the coil component is simple in process and high in production efficiency; secondly, only need the structure of spacer, just can realize the electrically conductive contact of valve body, stator polar plate, stator shell three, coil ground structure is simple, simple to operate.

Drawings

The invention is further described with reference to the accompanying drawings and the detailed description below:

FIG. 1 is a schematic view of an exploded structure of the present invention;

FIG. 2 is a schematic view of the assembled structure of the present invention;

FIG. 3 is a schematic top view of the present invention;

FIG. 4 is a schematic sectional view A-A of FIG. 3;

FIG. 5 is a schematic view of the structure of the spacer.

Detailed Description

The technical solutions of the embodiments of the present invention are explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present invention.

As shown in fig. 1 and 2, an electronic expansion valve includes a coil component 1, a valve seat component 2, and a valve body 3, where the coil component 1 includes a coil 11, a stator pole plate, a stator case 12 in conductive contact with the stator pole plate, and a non-conductive plastic casing 13 covering the stator case 12. The valve seat component 2 is mounted on the valve body 3 and comprises a valve seat 24, a rotor, a nut 21, a valve needle 22 and a valve needle spring 23. The coil component 1, the valve seat component 2 and the valve body 3 are mature structures in the prior art, and the specific structure and principle are not described again.

Referring to fig. 3 to 5, a connection terminal 15 is connected to the coil component 1, and a circuit board protection case 16 are provided outside the connection terminal 15. In order to realize the grounding of the coil component 1, the stator casing 12 is provided with a stator casing exposed part exposed outside the plastic package casing 13, and the electronic expansion valve further comprises a positioning sheet 4 which is arranged between the coil component 1 and the valve body 3 and is in conductive connection with the valve body 3.

Wherein, the bottom of the coil component 1 is provided with a welding column 14, and the positioning plate 4 is provided with a positioning hole 411 which is matched with the welding column 14 in a positioning way and is connected with the welding column in a welding way. The spacer 4 is fixed to the coil component 1 by ultrasonic or thermal welding. Ultrasonic or hot melting welding is adopted, welding materials do not need to be added, the contact part of the welding column 14 and the positioning hole 411 is directly subjected to hot melting, the installation is convenient, and the matching of the welding column 14 and the positioning hole 411 can ensure that reliable connection is formed after welding.

Referring to fig. 5, the positioning plate 4 is provided with a ring portion 41, and at least two positioning holes 411 are distributed along the circumferential direction of the ring portion. By matching the ring-shaped portion 41 and the plurality of positioning holes 411 with the corresponding welding posts 14, the connecting area between the positioning sheet 4 and the coil component 1 can be increased, and reliable connection can be ensured.

Furthermore, the positioning plate 4 is provided with a fixing portion 42 which is connected with the edge of the annular portion 41 and fixed with the valve body 3. The fixing portion 42 extends toward the side of the valve body 3 and is fixed to the valve body 3 by screws. The side of the valve body is correspondingly provided with a screw fixing hole 31, and the fixing part 42 is provided with a through hole 422. Through screw fixation spacer 4, the spacer is difficult to become flexible and even drops, compares in simple elastic contact electrically conductive moreover, and the electrically conductive contact reliability is higher after the screw fixation, and spacer 4 can not separate with valve body 3.

In order to ensure that the conductive contact 43 is in conductive contact with the stator housing 12, the positioning plate 4 may be made of a metal having good conductivity and good elasticity, such as stainless steel. The contact part 43 is provided with an elastic bending head 431 which is elastically contacted with the stator shell 12, and the good contact between the conductive contact part 43 and the stator shell 12 is ensured through the elastic action.

In order to facilitate the processing of the positioning plate 4, the positioning plate 4 may be formed by integral stamping, wherein the fixing portion 42 is formed by bending the outer edge of the annular portion 41, and the conductive contact portion 43 is formed by stamping the fixing portion 42, specifically, by bending the outer edge of the annular portion 41 opposite to the fixing portion 42.

In the present invention, the coil component 1 is welded and fixed to the spacer 4, and the spacer 4 is provided with a conductive contact portion 43 which is in conductive contact with the stator case 12. Firstly, the coil component 1 and the positioning sheet 4 are welded and fixed, and compared with a connecting mode of potting, the process is simple and the production efficiency is high; secondly, only need the structure of spacer 4, just can realize the electrically conductive contact of valve body 3, stator polar plate, stator shell 12 three, coil ground structure is simple, simple to operate. Therefore, the stator pole plate in the coil and the stator shell 12 can be ensured to be grounded and conducted, and the influence of static electricity generated by the coil on other components and the influence of static electricity generated by other components on the electronic expansion valve are avoided.

In addition, it should be noted that the stator plate and the stator housing of the coil are assembled together to form a good electrical contact, and when the positioning sheet 4 is in electrical contact with the stator housing 12 therein, the positioning sheet 4 will be in electrical contact with all the stator plates and the stator housing 12 inside the coil.

In order to facilitate processing and manufacturing, the plastic package housing 13 is of an integral injection molding structure. As can be understood by those skilled in the art, the exposed portion of the stator casing may be provided at any position of the stator casing 12, and in the preferred embodiment, the plastic package casing 13 has a pre-formed exposed notch 131 on the side surface or the bottom surface of the coil component 1 for exposing the stator casing 12. Of course, it is preferable to dispose the exposed notch 131 at the bottom side of the coil component 1, on one hand, the conductive contact portion 43 does not need to extend too long, and on the other hand, the elastic bending head 431 can be conveniently inserted into the exposed notch 131.

While the invention has been described with reference to specific embodiments thereof, it will be understood by those skilled in the art that the invention is not limited thereto, and may be embodied in many different forms without departing from the spirit and scope of the invention as set forth in the following claims. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.

Claims

1. The utility model provides an electronic expansion valve, its includes coil part and valve body, coil part includes stator plate, the stator casing that electrically conducts the contact with stator plate and the plastic envelope casing of nonconducting of cladding outside the stator casing, the stator casing is equipped with exposes in the outside stator casing exposed portion of plastic envelope casing, its characterized in that: the electronic expansion valve also comprises a positioning sheet arranged between the coil component and the valve body, the coil component and the positioning sheet are welded and fixed, and the positioning sheet comprises an annular part fixed with the coil component, a fixing part connected with the edge of the annular part and extending to the side face of the valve body, and a conductive contact part; the conductive contact part is provided with an elastic bending head which is in elastic contact with the exposed part of the stator shell.

2. An electronic expansion valve according to claim 1, wherein: the bottom of the coil component is provided with at least two welding columns, the positioning piece is provided with an annular part, and at least two positioning holes which correspond to the at least two welding columns in positioning fit and are in welding connection are distributed on the annular part along the circumferential direction.

3. An electronic expansion valve according to claim 2, wherein: the positioning piece is provided with a fixing part which is connected with the edge of the annular part and extends to the side face of the valve body, and the fixing part is fixed with the valve body through a screw.

4. An electronic expansion valve according to claim 3, wherein: the connecting part of the fixing part and the annular part is provided with a notch, and the conductive contact part extends out from the connecting part of the annular part and the notch.

5. An electronic expansion valve according to any of claims 1 to 4, wherein: the plastic package shell is of an integrated injection molding structure.

6. An electronic expansion valve according to claim 5, wherein: and an exposed notch for exposing the stator shell is reserved on the side surface or the bottom surface of the coil component of the plastic package shell.

7. An electronic expansion valve according to claim 1, wherein: the positioning sheet is fixed with the coil component through ultrasonic or hot melting welding.

8. The utility model provides an electronic expansion valve, its includes coil part and valve body, coil part includes stator plate, the stator casing that electrically conducts the contact with stator plate and the plastic envelope casing that does not conduct of cladding outside the stator casing, its characterized in that: the electronic expansion valve also comprises a positioning sheet arranged between the coil component and the valve body, wherein the positioning sheet comprises an annular part fixed with the coil component, a fixing part bent and extended from the outer edge of the annular part and positioned with the valve body, and a conductive contact part arranged on the fixing part, and the conductive contact part is bent and extended reversely from the outer edge of the annular part relative to the fixing part and is contacted with the stator shell.

9. An electronic expansion valve according to claim 8, wherein: the conductive contact part is formed by stamping the fixing part and is in elastic contact with the stator shell.