WO2015043536A1

WO2015043536A1 - Electronic expansion valve and coil device for same

Info

Publication number: WO2015043536A1
Application number: PCT/CN2014/087776
Authority: WO
Inventors: 魏先让; 许国华
Original assignee: 浙江三花股份有限公司
Priority date: 2013-09-30
Filing date: 2014-09-29
Publication date: 2015-04-02
Also published as: KR20160045841A; JP2016535225A; KR101857532B1; JP6340418B2

Abstract

A coil device for an electronic expansion valve. The coil device comprises a detachable housing and a stator winding provided in an inner cavity of the housing. A flow channel is provided on the housing. An inlet of the flow channel is in communication with a pouring port, and an outlet thereof is in communication with the inner cavity of the housing; or an injection molding material reaches an end surface of the housing through an injection molding channel, and forms a positioning element on the end surface of the housing. This coil is avoided from using a welding manner to be connected to the housing, thereby avoiding electrochemical corrosion caused by a welding process, prolonging the service life of the coil device, further simplifying the procedure of mounting of the positioning element and the housing, reducing the manufacturing costs of the coil device, and preventing damage of the coil device. Also provided is an electronic expansion valve using the coil device.

Description

Electronic expansion valve and coil device thereof

This application claims priority to Chinese Patent Application No. 201310465007.6, entitled "Electronic Expansion Valve and Coil Device", filed on September 30, 2013, and September 30, 2013 Priority is claimed on Chinese Patent Application No. 201310465022.0, the entire disclosure of which is hereby incorporated by reference in its entirety in its entirety in its entirety in the the the the the the the the the

Technical field

The present invention relates to the field of flow regulating valves for heat exchange systems, and more particularly to a coil device for an electronic expansion valve. The invention further relates to an electronic expansion valve comprising the above coil device.

Background technique

Electronic expansion valves are heat exchange systems, especially important throttling devices in frequency conversion equipment. The electronic expansion valve comprises a valve body and a coil device mounted on the valve body, wherein the coil device is a driving source for the operation of the electronic expansion valve, and the magnetic field generated by the coil device energizes the valve body to act. The coil assembly includes a housing and stator windings mounted within the housing. To ensure electrical insulation of the coil assembly, it is often desirable to encapsulate the stator windings with an injection molding material.

The conventional coil device adopts the method of outsourcing sealing, that is, as shown in the patent CN 101930821A, the coil device is assembled outside the stator winding before being placed in the mold encapsulation, and after being encapsulated in the mold, the casing is injected with the injection material. Enclosed inside. However, the form of the outer envelope encloses the entire casing, requires more injection molding materials, and has a higher manufacturing cost; at the same time, it is affected by the encapsulation material and the mold structure, and if the encapsulation layer is not cracked, the outer package is outsourced. The sealing coil needs to adopt high-grade encapsulation material, and the processing cost is high.

In order to save production costs, the inner encapsulation method is adopted at present, that is, as shown in the patent CN1831410A, the stator winding is first encapsulated to form an injection molded part, and then the outer casing is assembled outside the injection molded part; thus, the housing is formed after the injection molded part is molded. The outer part of the injection molded part is assembled inside the casing, and the casing is not required to be enclosed, which saves the amount of the injection molding material.

However, in the case of the inner enveloping form, since the casing is to be assembled after the stator winding is encapsulated, the casing needs to be split into two parts, the upper casing and the lower casing, in the form of the inner envelope, the enclosed portion does not include a housing on which the upper and lower housings are mounted on the injection molded molded part of the coil The upper and lower casings are fixedly connected by welding or riveting. Welding or riveting may cause damage to the coil device, affecting the performance of the coil device, and adding a process, the production process is elongated, and the production efficiency is lowered.

In addition, the coil device can be snapped to the valve body by a positioning member provided on its housing. Please refer to FIG. 8 and FIG. 9. FIG. 8 is a schematic structural view of a typical electronic expansion valve; FIG. 9 is a schematic structural view of a positioning component of the coil device in the electronic expansion valve shown in FIG.

A typical electronic expansion valve includes a coil device 1' and a valve body 2', wherein the coil device further includes a housing, a stator winding mounted in the housing, and a positioning member 3' mounted outside the housing; the valve body 2' A positioning portion is disposed thereon, and the positioning member 3' is engaged with the positioning portion to achieve engagement between the coil device 1' and the valve body 2'. The positioning member 3' includes a base 31', and a latching portion 32' mounted on the base 31' and a positioning step portion 33'. When assembled, the positioning member 3' is welded to the housing through the base 31' and passes through the latching portion. 32' is engaged with the positioning portion of the valve body 2', and the position of the coil device is adjusted by the positioning step portion 33'.

However, the connection between the positioning component and the housing is achieved by means of soldering, which causes galvanic corrosion of the metal due to the soldering process, causing corrosion of the housing and the positioning component, affecting the service life of the coil device; meanwhile, the positioning component and the housing are added. The processing steps increase the processing cost of the coil device.

Therefore, a new coil device is provided to avoid connection with the housing by soldering, thereby avoiding galvanic corrosion caused by the soldering process, prolonging the service life of the coil device, and reducing processing during positioning of the positioning component and the housing. The process, which reduces the processing cost of the coil device and avoids the damage of the coil device, is an urgent problem to be solved by those skilled in the art.

Summary of the invention

SUMMARY OF THE INVENTION An object of the present invention is to provide a coil device for an electronic expansion valve which can be prevented from being connected to a casing by means of welding, thereby avoiding galvanic corrosion caused by a welding process, prolonging the service life of the coil device, and reducing positioning components. And the processing process when the casing is installed, the processing cost of the coil device is reduced, and the damage of the coil device is avoided. Another object of the present invention is to provide an electronic expansion valve including the above coil device.

In order to solve the above technical problems, the present invention provides a coil device for an electronic expansion valve, The utility model comprises a detachable casing and a stator winding disposed in the inner cavity of the casing; the casing is provided with a flow guiding passage, the inlet of the guiding channel is connected with the pouring port, and an outlet thereof is in communication with the inner cavity of the casing.

Preferably, the flow guiding channel passes through a split of the housing.

Preferably, the outer side wall of the housing is provided with an injection ring opposite the inlet of the flow channel, the spout being disposed on the injection ring.

Preferably, the housing includes a first housing and a second housing detachably connected in a radial direction, and the injection ring is disposed at an interface of the first housing and the second housing.

Preferably, the flow guiding passage is an opening portion provided at an edge of the first casing and/or the second casing.

Preferably, the opening has a plurality of openings, and each of the openings is evenly distributed along a circumferential direction of the casing.

Preferably, the bottom of the opening portion is provided with a hook-shaped groove.

Preferably, the flow guiding channel is a through hole provided in a sidewall of the first housing and/or the second housing.

Preferably, the through hole has a plurality of through holes, and each of the through holes is evenly distributed along a circumference of the case.

Preferably, the inlet of the flow guiding channel is disposed opposite to the pouring port.

The present invention also provides an electronic expansion valve comprising a valve body and a coil device disposed in the valve body, the coil device being a coil device as described above.

The coil device provided by the invention is used for an electronic expansion valve, the coil device comprises a detachable casing and a stator winding disposed in the inner cavity of the casing, wherein the casing is provided with a flow guiding passage, the inlet and the pouring of the guiding channel The mouth is connected, and the outlet thereof communicates with the inner cavity of the casing; during the injection molding process, the injection molding material entering through the pouring port enters the flow guiding channel from the inlet and enters the inner cavity of the casing through the guiding channel, thereby being on the inner side wall of the casing An encapsulation layer is formed between the stator windings, and after the injection molding is completed, the encapsulation material is filled in the encapsulation layer and the flow guiding channel.

In this way, since the encapsulating material can enter the inner cavity of the casing through the flow guiding passage opened in the casing, the encapsulation of the stator winding is formed in the inner cavity of the casing, and both end faces and most sides of the casing are not enclosed. The encapsulation material is saved and the production cost is reduced.

In a preferred embodiment, the coil device provided by the present invention has an outer side wall of the casing provided with an injection ring opposite to the inlet of the flow guiding passage, and the pouring port is disposed on the injection ring; during the injection molding process The injection molding material entering the pouring port flows along the injection ring to the inlet of the flow guiding channel, and then enters the inner cavity of the casing, and the area of the injection ring is larger than that of the pouring port, and the inlet of the guiding channel It is easier to align with the sprue, which breaks the limitation of the position of the sprue and enlarges the settable range of the sprue.

In another preferred embodiment, the coil device provided by the present invention has an inlet of the flow guiding passage opposite to the pouring port, and the inlet of the guiding channel is directly opposite to the pouring port, and the injection molding material entering the pouring port is directly Entering the flow guiding channel from the inlet and entering the inner cavity of the casing shortens the flow path of the injection molding material, further avoiding waste of the injection molding material; at the same time, it is not necessary to provide an injection ring on the casing, which simplifies the structure of the device and saves the economy. Manufacturing costs.

The present invention also provides a coil device for an electronic expansion valve, comprising: a housing having a lumen, and a positioning member coupled to the valve body of the electronic expansion valve; the housing is provided with an injection molding passage, When the coil device is encapsulated, the injection molding material reaches the end face of the housing through the injection molding channel, and the positioning member is formed on the end face of the housing.

Preferably, the injection molding channel includes a through hole opened in the end surface, an inlet end of the through hole is located in an inner cavity of the housing, and an outlet end thereof is located at the end surface.

Preferably, the outer diameter of the outlet end of the through hole is larger than the outer diameter of the skeleton of the coil device and the end surface.

Preferably, the through holes are provided in plurality, and each of the through holes is evenly distributed along a circumferential direction of the end surface.

Preferably, the outlet end of the through hole has an oblong cross section.

Preferably, the injection molding passage includes an extension portion provided on a side wall of the casing, an inlet end of the extension portion is disposed in an injection ring of the coil device, and an outlet end thereof is disposed at the end surface.

Preferably, the extension has a plurality of extensions, and each of the extensions is circumferentially evenly distributed to the housing.

The coil device provided by the present invention is used for an electronic expansion valve, the coil device comprising a housing having a cavity, and a positioning component connected to the valve body of the electronic expansion valve, the injection molding channel is opened on the housing, and the coil device is in the package At the time of sealing, the injection molding material reaches the end surface of the casing through the injection molding passage, and the positioning member is formed on the end surface of the casing. In this way, the positioning component can be integrally injection molded while the coil device is encapsulated, and the positioning component and the housing are fixed without additional welding procedure, thereby reducing the installation process of the positioning component and the housing, and reducing the processing of the coil. At the same time, the injection molding process is filled with resin material to avoid galvanic corrosion caused by the welding process, avoiding corrosion of the casing and prolonging the service life of the coil device.

In a preferred embodiment, the coil device of the present invention has an injection passage including a through hole formed in an end surface of the casing, the inlet end of the through hole being located in the inner cavity of the casing, and the outlet end of the through hole being located at the end surface; When the device is encapsulated, the resin material for injection molding fills the inner cavity of the casing, and flows through the injection passage to the end surface of the casing to form the above-mentioned positioning member on the end surface; thus, the through hole which is axially opened at the end surface of the casing serves as a through hole. Injection molding channel, the structure is relatively simple, saving processing and manufacturing costs.

In another preferred embodiment, the coil device provided by the present invention has an injection passage further including an extension portion disposed on a sidewall of the housing, and an inlet end of the extension portion is disposed in the injection ring of the coil device, The outlet end is disposed at the end surface; during encapsulation, the resin material for injection molding in the inner cavity of the casing is also entered through the injection ring, and an extension portion is disposed between the injection ring and the end surface of the casing, and the resin material for injection molding is directly from the injection ring Arriving at the end face to form the upper positioning component; thus, the injection molding channel increases the structure of the extension portion, thereby cooperating with the through hole to realize injection molding of the positioning component, improving the injection molding efficiency of the positioning component, and improving the positioning component and the encapsulation layer Part of the connection strength.

DRAWINGS

1 is a cross-sectional view showing a specific embodiment of a coil device according to the present invention;

2 is a perspective view of a specific embodiment of a coil device according to the present invention;

3 is a schematic structural view of a specific embodiment of a flow guiding channel in the coil device shown in FIG. 2;

4 is a schematic structural view of a specific embodiment of the opening portion of FIG. 3;

FIG. 5 is a schematic structural view showing a form of a sprue of a coil device according to the present invention; FIG.

6 is a schematic structural view of another embodiment of a coil device according to the present invention;

FIG. 7 is a schematic flow chart of a package assembly process of a coil device according to the present invention.

Figure 8 is a schematic structural view of a typical electronic expansion valve;

9 is a schematic structural view of a positioning component of a coil device in the electronic expansion valve shown in FIG. 8;

10 is a schematic structural view of another embodiment of a coil device according to the present invention;

Figure 11 is a schematic structural view of a housing of the coil device shown in Figure 10;

FIG. 12 is a schematic structural view of another embodiment of a coil device according to the present invention. Wherein, 1-shell, 11-first shell, 12-second shell; 13-end face; 14-side wall;

2-stator winding, 3-spray, 4-injection ring, 41-transition envelope;

51-opening, 511-hook groove, 52-first through hole;

61-skeleton, 62-lacquered wire, 63-pin, 64-electromagnetic plate;

7-stator assembly, 8-coil injection molded part, 9-envelope layer;

42-positioning component;

43-second through hole;

44-Extension.

detailed description

The core of the present invention is to provide a coil device for an electronic expansion valve that avoids being connected to the housing by soldering, thereby avoiding galvanic corrosion caused by the soldering process, prolonging the service life of the coil device, and reducing positioning components and The processing procedure during the mounting of the housing reduces the processing cost of the coil device and avoids damage to the coil device. Another core of the present invention is to provide an electronic expansion valve including the above coil device.

In order to make those skilled in the art better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

Please refer to FIG. 1. FIG. 1 is a cross-sectional view showing a specific embodiment of a coil device according to the present invention.

The coil device provided by the present invention is used for an electronic expansion valve, and the coil device comprises a detachable housing 1 and a stator winding 2 disposed in the inner cavity of the housing. The housing 1 is provided with a flow guiding channel, and the guiding channel is The inlet is in communication with the sprue 3, the outlet of which is in communication with the inner chamber of the housing, and the flow guiding passage passes through the disassembly of the housing 1; during the injection molding process, the injection molding material entering through the sprue 3 enters the diversion from the inlet The passage enters the inner cavity of the casing through the flow guiding passage, thereby forming an encapsulation layer 9 between the inner side wall of the casing 1 and the stator winding 2. After the injection molding is completed, the encapsulation material is filled in the encapsulation layer and the flow guiding passage.

The above-mentioned flow guiding passage is not limited to being disposed at the disassembling portion of the casing 1. As long as the inner cavity of the casing 1 and the pouring port 3 can be communicated, the flow guiding passage can be theoretically opened at any position of the casing 1.

Specifically, the above-mentioned flow guiding passage may be a first through hole 52 which is configurable in the thickness direction of the casing 1 or a first through hole 52 which is inclined with respect to the thickness direction of the casing 1 and the first through hole 52 The axis may be a straight line, a fold line or even a curved line; the inlet of the flow guiding channel is an opening in the outer side wall of the casing 1, and the outlet of the flow guiding channel is an opening in the inner side wall of the casing 1.

The flow guiding passage can be divided into several parts by the splitting of the casing 1 and divided into the shell 1 The two parts, that is, the first housing 11 and the second housing 12 are exemplified. Specifically, the structure of the flow guiding passage may be such that the inlet thereof is located in the first housing 11 and the outlet is located in the second housing 12, and the passage portion passes through the The junction of a casing 11 and the second casing 12; the flow guiding passage may also be directly opened at the junction of the first casing 11 and the second casing 12.

The encapsulating materials employed in the present invention are various injection molding materials conventionally used in the art, such as ABA, ABS, and the like.

In this way, since the encapsulating material can enter the inner cavity of the casing 1 through the flow guiding passage opened in the casing 1, the encapsulation of the stator winding 2 is formed in the inner cavity of the casing, and both end faces and most of the side walls of the casing 1 are formed. Not included in the enveloping portion, thereby saving the encapsulating material and reducing the production cost; meanwhile, at the time of injection molding, the flow guiding passage is also filled with the injection molding material, and the diversion passage passes through the split portion of the casing 1, Then, the independent shell parts are combined by the injection molding material to realize the fixed connection between the parts of the casing 1 , and the installation and fixing of the casing 1 are realized at the same time of encapsulation, and the welding or riveting process is unnecessary, and the coil is avoided. The device is damaged and the production process is shortened and the production efficiency is improved.

Please refer to FIG. 2, and please refer to FIG. 1 together. FIG. 2 is a perspective view of a specific embodiment of a coil device according to the present invention.

In a specific embodiment, the coil device provided by the present invention has an outer side wall of the casing 1 provided with an injection ring 4 opposite to the inlet of the flow guiding channel, and the pouring port 3 is disposed on the injection ring 4; During the encapsulation process, the injection molding material entering the pouring port 3 flows along the injection ring 4 to the inlet of the flow guiding channel, and then enters the inner cavity of the casing. Compared with the pouring port 3, the area of the injection ring 4 is larger, and the inlet of the guiding channel is It is easier to align with the sprue 3, breaking the limitation of the position of the sprue 3, and expanding the settable range of the sprue 3.

Obviously, there is a flow of injection molding material between the injection ring 4 and the housing 1 during injection molding, and there should be a proper gap between the injection ring 4 and the outer side wall of the housing 1 to ensure smooth flow of the injection molding material.

Preferably, the injection ring 4 can be circumferentially arranged around the casing 1 such that the injection molding material flowing in the pouring port 3 at any position on the injection ring 4 can flow on the injection ring 4 and enter the casing cavity for injection molding. The process has good continuity and high efficiency. Theoretically speaking, the injection ring 4 is not limited to one week, and the injection ring 4 can be segmented. Specifically, an injection ring 4 of a proper size is disposed at each of the gates 3, and the inlets of the flow channels are respectively Different injection molding rings 4 are aligned, that is, each pouring port 3 passes through different injection molding rings 4 and the inlet pairs of the respective flow guiding channels The injection molding material flowing into each of the pouring openings 3 enters the housing cavity through the corresponding flow guiding passages. Generally, the first housing 11 and the second housing 12 are detachably connected along the radial direction of the housing, and the injection ring 4 is disposed at the junction of the first housing 11 and the second housing 12 so that The fixed connection of the two housings is achieved by injection molding material in the injection ring 4.

In actual operation, the injection ring 4 can be formed by a ring-shaped sprue 3 .

Obviously, the first housing 11 and the second housing 12 are not limited to being split in the radial direction of the housing 1, and the purpose of splitting the housing 1 is to mount the components inside the housing 1, so that The splitting is sufficient, and the splitting of the first housing 11 and the second housing 12 in any form and direction is not limited.

As shown in FIG. 3, the above-mentioned flow guiding passage may be an opening portion 51 provided at the edge of the first casing 11 and the second casing 12. Specifically, the opening portion 51 is divided into two parts, and a part is opened in the first casing 11 The other part is opened on the second casing 12, and the two portions of the opening portion 51 are oppositely opened, so that the injection molding material smoothly enters the inner cavity of the casing to ensure the smooth completion of the encapsulation.

Theoretically, the opening portion 51 is not limited to being disposed on the first housing 11 and the second housing 12, and may be provided only on the first housing 11 or only on the second housing 12.

The opening portion 51 has a plurality of openings, and each of the opening portions 51 is evenly distributed along the circumferential direction of the casing 1. In many cases, the first casing 11 and the second casing 12 generally follow the diameter of the casing 1 in consideration of the convenience of disassembly. Splitting into the upper and lower portions in the lateral direction, the opening portions 51 are evenly distributed in the circumferential direction of the casing 1 so as to be matched with the junctions of the first casing 11 and the second casing 12.

As shown in FIG. 4, a hook-shaped groove 511 may be disposed at the bottom of the opening portion 51. After the injection molding, the injection-molded layer is integrated into the hook-shaped groove 511, so that the axial fixation of the first outer casing and the second outer casing can be achieved. The disengagement of the two-part housing is prevented, and the assembly reliability of the housing 1 is improved.

The above-described flow guiding passage is not limited to the above-described opening portion 51, and may be a first through hole 52 provided in the side walls of the first casing 11 and/or the second casing 12. The first through hole 52 may have a plurality of, and each of the first through holes 52 is evenly distributed along the circumferential direction of the housing 1.

Preferably, the first through hole 52 and the opening portion 51 are simultaneously disposed. At this time, the function of the first through hole 52 is mainly to achieve axial fixation of the first housing 11 and the second housing 12 to prevent the first housing. The disengagement of the first housing 12 and the second housing 12 serves as an auxiliary function for the flow guiding passage to be the first through hole 52.

The pouring port 3 of the mold used in the present invention may be a square port, a circular port or the like, and various forms of the sprue 3 conventionally used in the art; preferably, as shown in FIG. 5, connected to the above-mentioned injection ring 4 A transitional envelope structure can be used, and in the case of injection molding, a latent dot gate can be used on the transition envelope 41. Obviously, the sprue 3 provided by the present invention is not limited to the above-described arrangement, and may be various forms of the sprue 3 conventionally used in the art.

Further improvements can be made to the coil arrangement provided by the present invention.

Please refer to FIG. 6. FIG. 6 is a schematic structural diagram of another embodiment of a coil device according to the present invention.

In another preferred embodiment, the coil device provided by the present invention has an inlet of the flow guiding passage opposite to the pouring port 3, and directly makes the inlet of the guiding channel and the pouring port 3 relatively positive, and the pouring port 3 enters. The injection molding material enters the flow guiding channel directly from the inlet, and then enters the inner cavity of the casing 1, shortening the flow path of the injection molding material, further avoiding waste of the injection molding material; meanwhile, it is not necessary to provide the injection ring 4 on the casing 1, which simplifies The structure of the device saves manufacturing costs.

Obviously, the above-described structure in which the injection ring 4 is not provided can also be understood as an embodiment in the case where the thickness of the injection ring 4 described in the above embodiment is the minimum limit.

This embodiment merely eliminates the structure of the injection ring 4 and defines the position of the gate 3 and the inlet of the flow channel, and other structures are the same as in the first embodiment.

It should be pointed out that the ordinal numbers such as "first, second" and the like are only used to distinguish different structures of the same name, do not indicate a certain order, and should not be construed as any limitation.

Hereinafter, the package assembly process of the coil device provided by the present invention will be briefly described by taking the above first embodiment as an example.

Please refer to FIG. 7. FIG. 7 is a schematic flow chart of a package encapsulation process of a coil device according to the present invention.

A plurality of enameled wires 62 are wound around the bobbin 61 of the coil device, and the enameled wire 62 is wound around the pins 63 fixed to the bobbin 61, and the electrical connection between the enamelled wire 62 and the pins 63 is achieved by soldering or the like. Forming the stator winding 2; before inserting the molding cavity, mounting the housing 1 and the electromagnetic plate 64 on the stator winding 2, respectively, and superimposing the assembled two components together to form the stator assembly 7; The stator assembly 7 is placed in an injection molding cavity, and is melted and fixed by a resin to form a coil injection molded part 8, thereby achieving insulation encapsulation of the coil stator winding 2, and axial and radial positioning of the first housing 11 and the second housing 12. At the time of manufacture, the annular injection ring 4 can also be formed in the cavity by a rectangular pouring gate 3 distributed along the circumference.

Please refer to FIG. 10 and FIG. 11. FIG. 10 is a specific implementation of the coil device provided by the present invention. FIG. 11 is a schematic structural view of a casing in the coil device shown in FIG. 10.

The coil device provided by the present invention is used for an electronic expansion valve, and the coil device includes a bobbin 61 on which a certain number of enameled wires 62 are wound, and an enameled wire 62 is wound around a pin 63 fixed to the bobbin 61. The electrical conduction connection between the enameled wire 62 and the pin 63 is achieved by soldering or the like to form a coil stator winding; the housing 1 and the electromagnetic plate 64 are respectively mounted on the upper and lower sides of the stator winding, and the stator assembly is superposed to form a stator assembly, and then the stator assembly is assembled It is placed in an injection mold cavity and is fixed by melting with a thermosetting or thermoplastic resin to form a coil injection molded part. The coil device further includes a housing 1 having a lumen, and a positioning member 42 connected to the valve body of the electronic expansion valve. The housing 1 is provided with an injection passage, and when the coil device is encapsulated, the injection molding material is reached through the injection passage. The end face 13 of the housing 1 and the positioning element 42 are formed on the end face 13 of the housing 1.

In this way, the positioning component 42 can be integrally injection molded while the coil device is encapsulated, and the positioning component 42 and the housing 1 can be fixed without additional welding procedures, thereby reducing the mounting process of the positioning component 42 and the housing 1. The processing cost of the coil is reduced; at the same time, the injection molding process is filled with a resin material to avoid galvanic corrosion caused by the welding process, avoiding corrosion of the casing 1 and prolonging the service life of the coil device.

In a specific embodiment, the coil device of the present invention has an injection passage including a second through hole 43 formed in the end surface 13 of the casing, and an inlet end of the second through hole 43 is located in the inner cavity of the casing 1. The outlet end is located at the end surface 13; when the coil device is encapsulated, the resin material for injection molding fills the inner cavity of the housing 1, and flows through the injection passage to the end surface 13 of the housing 1, forming the positioning member 42 on the end surface 13; Thus, the second through hole 43 axially opened at the end surface 13 of the casing serves as an injection passage, and the structure is relatively simple, which saves processing and manufacturing costs.

The second through hole 43 may be opened in the thickness direction of the casing 1 or may be a second through hole 43 inclined with respect to the thickness direction of the casing 1. The axis of the second through hole 43 may be a straight line or may be Polyline, even curves.

The outer diameter of the outlet end of the second through hole 43 is larger than the outer diameter of the frame 61 of the coil device and the end surface 13, so that after the frame 61 of the coil device is assembled with the casing 1, the outlet end of the second through hole 43 It will not be completely obscured to ensure that the flow path of the resin material can be formed during injection molding.

Theoretically, as long as the assembly can be ensured, the second through hole 43 can communicate with the end surface 13 of the casing and the inner cavity to form the positioning member 42 on the end surface 13, and the specific outer diameter of the outlet end of the second through hole 43 is not The limit is larger than the outer diameter at which the skeleton 61 and the end surface 13 are in contact with each other. As long as the resin material can pass smoothly.

The cross section of the outlet end of the second through hole 43 may be an oblong shape, or may be any other shape such as a circle, a square, or other regular or irregular shape. The shape of the cross section of the second through hole 43 may be the same, that is, the circle may be rounded everywhere, or may be square or the like everywhere, or the inlet end may be circular, and the outlet end may be of other shapes or the like; The outer diameters of the through holes 43 may be equal or slightly different, and may be determined according to actual use conditions.

A plurality of the second through holes 43 may be disposed, and each of the second through holes 43 is evenly distributed along the circumferential direction of the end surface 13, so that during the injection molding of the positioning member 42, the plurality of second through holes 43 are simultaneously conveyed by the resin material for injection molding. The efficiency of the injection molding of the positioning member 42 is improved, and the uniformity of the molding of the positioning member 42 is ensured.

Specifically, the second through holes 43 may be provided in six, eight or more, and each of the second through holes 43 is preferably evenly distributed in the circumferential direction of the end surface 13 or may be non-uniformly disposed.

Further improvements to the above specific embodiments are also possible.

Please refer to FIG. 12. FIG. 12 is a schematic structural diagram of another embodiment of a coil device according to the present invention.

In another embodiment, the coil device provided by the present invention further includes an extension portion 44 of the side wall 14 of the housing 1 , and an inlet end of the extension portion 44 is disposed at the injection ring of the coil device. 4, the outlet end thereof is disposed on the end surface 13; at the time of encapsulation, the resin material for injection molding in the inner cavity of the housing is also entered through the injection ring 4, and an extension 44 is provided between the injection ring 4 and the end surface 13 of the housing 1. The resin material for injection molding is directly from the injection ring 4 to the end face 13 to form the upper positioning member 42; thus, the injection passage increases the structure of the extension portion 44, thereby cooperating with the second through hole 43 to effect injection molding of the positioning member 42. The injection efficiency of the positioning member 42 is improved, and the connection strength between the positioning member 42 and the encapsulation portion is improved.

The extending portion 44 may be disposed on the side wall 14 in the thickness direction of the casing 1 or may be disposed on the side wall 14 obliquely with respect to the thickness direction. The extending axis of the extending portion 44 may be a straight line, a fold line or a curved line or the like.

There may be a plurality of extensions 44 provided by the present invention, and the extensions 44 are circumferentially evenly distributed to the housing 1 in order to improve the injection efficiency of the positioning member 42 and to ensure injection uniformity of the positioning member 42.

Specifically, the extensions 44 may be four or two, five or other numbers.

It should be noted that in different embodiments, the extension 44 may be connected to the second through hole 43 is coexisting, and the second through hole 43 may not be provided, and only the extending portion 44 may be provided, and the function of the extending portion 44 in place of the second through hole 43 may be employed.

In addition to the above-mentioned coil device, the present invention also provides an electronic expansion valve including the above-mentioned coil device. For the structure of the electronic expansion valve, please refer to the prior art, and details are not described herein again.

The electronic expansion valve and its coil device provided by the present invention are described in detail above. The principles and embodiments of the present invention have been described herein with reference to specific examples, and the description of the above embodiments is only to assist in understanding the method of the present invention and its core idea. It should be noted that those skilled in the art can make various modifications and changes to the present invention without departing from the spirit and scope of the invention.

Claims

A coil device for an electronic expansion valve, comprising a detachable housing (1) and a stator winding (2) disposed in a housing inner cavity; wherein the housing (1) is provided with a diversion The passage, the inlet of the flow guiding passage is in communication with the pouring port (3), and the outlet thereof is in communication with the inner cavity of the casing.
A coil device for an electronic expansion valve according to claim 1, wherein said flow guiding passage passes through a split portion of said casing (1).
The coil device for an electronic expansion valve according to claim 1 or 2, characterized in that the outer side wall of the casing (1) is provided with an injection ring (4) opposite to the inlet of the flow guiding passage, The sprue (3) is disposed on the injection ring (4).
A coil device for an electronic expansion valve according to claim 3, wherein said housing (1) includes a first housing (11) and a second housing (12) that are detachably coupled in the radial direction. The injection ring (4) is disposed at the junction of the first housing (11) and the second housing (12).
A coil device for an electronic expansion valve according to claim 4, wherein said flow guiding passage is provided at an edge of said first casing (11) and/or said second casing (12) Opening (51).
A coil device for an electronic expansion valve according to claim 5, wherein said opening portion (51) has a plurality of said opening portions (51) uniformly distributed in the circumferential direction of said casing (1) .
The coil device for an electronic expansion valve according to claim 6, wherein a bottom of the opening portion (51) is provided with a hook-shaped groove (511).
A coil device for an electronic expansion valve according to claim 4, wherein said flow guiding passage is provided on said first casing (11) and/or said second casing (12) side Through hole (52) of the wall.
A coil device for an electronic expansion valve according to claim 7, wherein said through hole (52) has a plurality of said through holes (52) uniformly distributed along a circumference of said casing (1) .
A coil device for an electronic expansion valve according to claim 1 or 2, characterized in that the inlet of the flow guiding passage is arranged opposite to the pouring port (3).
A coil device for an electronic expansion valve, comprising a housing (1) having a lumen, and a positioning member (42) coupled to the valve body of the electronic expansion valve; characterized in that the housing (1) The upper opening is provided with an injection passage, and when the coil device is encapsulated, the injection molding material reaches the end surface (13) of the casing (1) through the injection passage, and is at the end surface of the casing (1) (13) The positioning element (42) is formed thereon.
The coil device for an electronic expansion valve according to claim 11, wherein the injection passage includes a second through hole (43) opened in the end surface (13), and the second through hole (43) The inlet end of the casing is located in the inner cavity of the casing (1), and the outlet end thereof is located at the end face (13).
The coil device for an electronic expansion valve according to claim 12, wherein an outer diameter of the outlet end of the second through hole (43) is larger than a skeleton (61) of the coil device and the end surface ( 13) The outer diameter of the fit.
The coil device for an electronic expansion valve according to claim 13, wherein the second through hole (43) is provided in plurality, and each of the second through holes (43) is along the end surface (13) The circumferential direction is uniform.
The coil device for an electronic expansion valve according to claim 14, wherein the outlet end of the second through hole (43) has an oblong cross section.
A coil device for an electronic expansion valve according to any one of claims 11 to 15, wherein the injection passage includes an extension (44) provided on a side wall (14) of the casing (1) The inlet end of the extension (44) is disposed in the injection ring (4) of the coil device, and the outlet end thereof is disposed on the end surface (13).
The coil device for an electronic expansion valve according to claim 16, wherein a plurality of the extending portions (44) are provided, and each of the extending portions (44) is circumferentially evenly distributed to the casing (1).
An electronic expansion valve comprising a valve body and a coil device disposed in the valve body, wherein the coil device is the coil device according to any one of claims 1 to 17.