JP2016535225A - Electronic expansion valve and coil device thereof - Google Patents

Abstract

In a coil device used for an electronic expansion valve, which includes a separable housing and a stator winding provided in an inner chamber of the housing, a fluid guide passage is opened in the housing. The inlet of the fluid guide passage communicates with the pouring gate, and the outlet communicates with the inner chamber of the housing. Alternatively, the injection molding material reaches the end surface of the housing via the injection molding passage, and the positioning element is formed on the end surface of the housing. Such a coil device is prevented from being connected to the housing by a welding method, so that electrochemical corrosion due to the welding process is avoided, and the useful life of the coil device is extended. The machining process at the time of attachment of the coil device is reduced, and not only the machining cost of the coil device is reduced, but also the damage of the coil device can be avoided. The present invention further provides an electronic expansion valve to which the coil device is applied.

Description

This application is filed with the Chinese Patent Office on September 30, 2013, and the priority of the Chinese patent application whose application number is 201310465007.6 and whose title is "electronic expansion valve and its coil device", and Claimed the priority of a Chinese patent application filed with the Chinese Patent Office on September 30, 2013, whose application number is 20130144622.0, and whose title is "electronic expansion valve and its coil device". The contents of all of which are incorporated herein.

The present invention relates to the field of flow control valves in heat exchange systems, and more particularly to coil devices used in electronic expansion valves. Moreover, this invention relates to an electronic expansion valve provided with said coil apparatus.

Electronic expansion valves are an important throttle device in heat exchange systems, particularly in inverter equipment. The electronic expansion valve includes a valve body and a coil device attached to the valve body. Among them, the coil device is a drive source for operating the electronic expansion valve, and is driven so that the valve body is operated by a magnetic field generated by energizing the coil device. The coil device includes a housing and a stator winding mounted in the housing. In order to ensure the electrical insulation of the coil device, it is usually necessary to encapsulate the stator windings using an injection molding material.

Conventional coil devices often employ an outer encapsulation method, ie, as shown in patent CN 101930821A, the housing is already assembled outside the stator windings before the coil device is placed in the mold and encapsulated. After the coil device is sealed in the mold, the housing is sealed with the injection molding material. However, in this type of outer encapsulation, since the entire housing is encapsulated, it is necessary to use a relatively large amount of injection molding material, and the manufacturing cost is relatively high. At the same time, in order to ensure that the encapsulating layer does not tear due to the encapsulating material and the structure of the mold, it is necessary to employ a high-quality encapsulating material that encapsulates the coil on the outside, and the processing cost is relatively high.

In order to save the production cost, the inner sealing method is often adopted at present. That is, as shown in the patent CN1831410A, the stator winding is first sealed to form the injection molding member, and then the injection molding is performed. A housing is mounted outside the molded member. Thus, the housing is mounted outside the injection molded member after the injection molded member is molded, and the injection molded member is located inside the housing, so there is no need to enclose the housing, and the injection molding material The dose is saved.

However, when adopting the inner encapsulation, since the housing is mounted after the stator winding is encapsulated, the housing needs to be divided into two parts, an upper housing and a lower housing. In such an inner encapsulation type, the housing is not included in the encapsulated part, and the upper housing and the lower housing are attached to the coil injection molded member that has already been molded, and the upper and lower housings are connected by welding or caulking. The housing is fixedly connected. Welding or caulking may damage the coil device, which not only affects the use performance of the coil device, but also increases one process, resulting in a longer production flow and reduced production efficiency. Yes.

The coil device can be engaged and connected to the valve body by a positioning element provided in the housing. 8 and 9, FIG. 8 is a schematic configuration diagram of a typical electronic expansion valve, and FIG. 9 is a schematic configuration diagram of a positioning element of the coil device in the electronic expansion valve shown in FIG.

A typical electronic expansion valve comprises a coil device 1 'and a valve body 2', in which the coil device further comprises a housing, a stator winding mounted in the housing, and a positioning element 3 mounted outside the housing. ′. The valve body 2 'is provided with a positioning portion, and the positioning element 3' cooperates with the positioning portion so as to engage and connect the coil device 1 'and the valve body 2'. The positioning element 3 'includes a base 31', a locking portion 32 'attached to the base 31', and a positioning step 33 '. The positioning element 3' is welded to the housing by the base 31 'when mounted. The stop portion 32 'cooperates 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, if the positioning element is connected to the housing by the welding method, the welding process leads to electrochemical corrosion of the metal, and thus the rust corrosion occurs in the housing and the positioning element, which affects the useful life of the coil device. Further, the processing steps of the positioning element and the housing increase, and the processing cost of the coil device increases.

Therefore, by avoiding the connection to the housing by the welding method, the electrochemical corrosion due to the welding process is avoided, the service life of the coil device is extended, and the processing steps when mounting the positioning element and the housing are reduced. Therefore, it is an urgent problem for those skilled in the art to provide a new type of coil device that not only reduces the processing cost of the coil device but also prevents the coil device from being damaged.

Published Chinese application CN101930821A Published Chinese application CN1831410A

An object of the present invention is to provide a coil device for use in an electronic expansion valve. Since the coil device avoids connection of a housing by a welding method, electrochemical corrosion due to a welding process is avoided, and the coil device is provided. The service life of the coil device is extended, the number of processing steps when the positioning element and the housing are attached is reduced, and not only the processing cost of the coil device is reduced, but also the damage of the coil device can be avoided. Another object of the present invention is to provide an electronic expansion valve including the coil device.

In order to solve the above technical problem, the present invention provides a coil device used for an electronic expansion valve, the coil device comprising a detachable housing and a stator winding provided in an inner chamber of the housing, A fluid guide passage is opened in the housing, and an inlet of the fluid guide passage communicates with a pouring gate, and an outlet thereof communicates with an inner chamber of the housing.

It is preferable that the fluid guide passage passes through a divided portion of the housing.

It is preferable that an injection molding ring facing the inlet of the fluid guide passage is provided on the outer wall of the housing, and the injection pouring gate is provided on the injection molding ring.

The housing includes a first housing and a second housing that are separably connected along a radial direction, and the injection molding ring is provided at a connection point between the first housing and the second housing. Is preferred.

It is preferable that the fluid guide passage is an opening provided at an edge of the first housing and / or the second housing.

It is preferable that there are a plurality of openings, and each of the openings is uniformly distributed along the circumferential direction of the housing.

It is preferable that a hook-shaped groove is provided at the bottom of the opening.

It is preferable that the fluid guide passage is a through hole provided in a side wall of the first housing and / or the second housing.

It is preferable that there are a plurality of the through holes, and each of the through holes is uniformly distributed along the circumferential direction of the housing.

It is preferable that the inlet of the fluid guide passage is installed opposite to the pouring gate.

The present invention provides an electronic expansion valve comprising a valve body and a coil device provided in the valve body, wherein the coil device is a coil device as described above.

The coil device provided by the present invention is used for an electronic expansion valve, and the coil device includes a detachable housing and a stator winding provided in an inner chamber of the housing, and a fluid guide passage is opened in the housing. The inlet of the fluid guide passage communicates with the pouring gate, and the outlet communicates with the inner chamber of the housing. During the injection molding sealing process, the injection molding material that has entered from the pouring gate enters the fluid guide passage from the inlet, and enters the inner chamber of the housing through the fluid guide passage, so that the inner wall of the housing and the stator winding are wound. An encapsulation layer is formed between the wires, and after the injection molding is completed, the encapsulation layer and the fluid guide passage are filled with the encapsulation material.

Thus, since the encapsulating material enters the inner chamber of the housing through the fluid guide passage that is opened in the housing, the stator winding is encapsulated in the inner chamber of the housing, and both end faces and most side surfaces of the housing are Not encapsulated, saving encapsulating material and reducing production costs.

In a preferred embodiment, the coil device provided by the present invention is provided with an injection molding ring facing the inlet of the fluid guide passage on the outer wall of the housing, and the injection molding ring is provided with an injection gate. During the injection molding sealing process, the injection molding material entered from the pouring gate flows along the injection molding ring to the inlet of the fluid guide passage and enters the inner chamber of the housing. The larger the area of the injection molding ring compared to the pouring gate, the easier it is to align the inlet of the fluid guide passage and the pouring gate, thereby releasing the restriction on the pouring position of the pouring gate. The installation range is widened.

In another preferred embodiment, the coil device provided by the present invention is configured such that the inlet of the fluid guide passage is disposed opposite to the pouring gate, and the inlet of the fluid guide passage is directly aligned with the pouring gate. The injection molding material that has entered from directly enters the fluid guide passage from the inlet, and further enters the inner chamber of the housing. As a result, the flow path of the injection molding material is shortened, and the waste of the injection molding material is avoided. At the same time, there is no need to provide the injection molding ring in the housing, the configuration of the apparatus is simplified, and the production cost is saved. The

The present invention further provides a coil device used for an electronic expansion valve, the coil device including a housing having an inner chamber and a positioning element connected to a valve body of the electronic expansion valve, and the housing is injection-molded. A passage is opened, and when the coil device is sealed, the injection molding material reaches the end surface of the housing through the injection molding passage, and the positioning element is formed on the end surface of the housing.

It is preferable that the injection molding passage has a through hole opened in the end face, the entrance end of the through hole is located in the inner chamber of the housing, and the exit end thereof is located in the end face.

The outer diameter of the outlet end of the through hole is preferably larger than the outer diameter after the skeleton of the coil device and the end face are bonded together.

It is preferable that a plurality of the through holes are provided, and each of the through holes is uniformly distributed along the circumferential direction of the end surface.

The cross section of the outlet end of the through hole is preferably oval.

The injection molding passage includes an extending portion provided on a side wall of the housing, an entrance end of the extending portion is provided in an injection molding ring of the coil device, and an exit end thereof is provided on the end surface. It is preferred that

It is preferable that there are a plurality of extending portions, and each extending portion is uniformly distributed in the housing along a circumferential direction.

The present invention further includes a valve body and a coil device provided in the valve body, and the coil device provides an electronic expansion valve which is a coil device as described above.

The coil device provided by the present invention is used for an electronic expansion valve, and the coil device includes a housing having an inner chamber and a positioning element connected to a valve body of the electronic expansion valve, and the housing has an injection molding passage. When the coil device is sealed, the injection molding material reaches the end surface of the housing through the injection molding passage, and the positioning element is formed on the end surface of the housing. Thus, at the same time that the coil device is enclosed, the positioning element is integrally injection-molded, and it is not necessary to add a separate welding process to realize the fixing of the positioning element and the housing. The coil processing cost is reduced. At the same time, the resin material is used for filling and molding in the injection molding process, so that the electrochemical corrosion caused by the welding process is avoided, the rust corrosion of the housing is avoided, and the useful life of the coil device is extended.

In a preferred embodiment, the coil device provided by the present invention comprises a through hole whose injection molding passage is opened in the end surface of the housing, and the entrance end of the through hole is located in the inner chamber of the housing, The exit end is located on the end face. When the coil device is sealed, the resin material for injection molding fills the inner chamber of the housing and flows to the end surface of the housing through the injection molding passage, and the positioning element is formed on the end surface. As described above, when the through hole formed in the end surface of the housing in the axial direction is used as the injection molding passage, the configuration is relatively simple, and the cost of manufacturing and manufacturing is saved.

In another preferred embodiment, the coil device provided by the present invention further comprises an extension portion whose injection molding passage is provided in the side wall of the housing, and the entrance end of the extension portion is provided on the coil device. It is provided in the injection molding ring, and its outlet end is provided on the end face. At the time of sealing, the resin material for injection molding in the inner chamber of the housing also enters from the injection molding ring, and an extended portion is provided between the injection molding ring and the end surface of the housing to inject so as to form a positioning element. The molding resin material reaches the end face directly from the injection molding ring. As described above, by adding the structure of the extending portion to the injection molding passage, the injection molding of the positioning element is realized in cooperation with each other in the through hole, the injection molding efficiency of the positioning element is improved, and the positioning element The connection strength between the sealing layer portion and the sealing layer portion is improved.

FIG. 1 is a cross-sectional view of one embodiment of a coil device provided by the present invention. FIG. 2 is an orthographic view of one specific embodiment of a coil device provided by the present invention. FIG. 3 is a schematic configuration diagram of a specific embodiment of the fluid guide passage in the coil device shown in FIG. FIG. 4 is a schematic diagram showing the configuration of a specific embodiment of the opening in FIG. FIG. 5 is a schematic diagram of a configuration of a type of pouring gate of the coil device provided by the present invention. FIG. 6 is a schematic diagram of the configuration of another specific embodiment of the coil device provided by the present invention. FIG. 7 is a flow schematic diagram of a kind of enclosing mounting process of the coil device provided by the present invention. FIG. 8 is a schematic diagram of a type of typical electronic expansion valve. FIG. 9 is a schematic diagram of the configuration of the positioning element of the coil device in the electronic expansion valve shown in FIG. FIG. 10 is a schematic diagram of the configuration of another specific embodiment of the coil device provided by the present invention. FIG. 11 is a structural schematic diagram of a housing in the coil device shown in FIG. FIG. 12 is a schematic diagram of the configuration of another specific embodiment of the coil device provided by the present invention.

The core of the present invention provides a coil device used for an electronic expansion valve, and since the coil device can be prevented from being connected to the housing by a welding method, electrochemical corrosion due to the welding process can be avoided, and In addition to extending the service life, the number of machining steps when attaching the positioning element and the housing is reduced, so that not only the machining cost of the coil device is reduced, but also damage to the coil device can be avoided. Another core of the present invention is to provide an electronic expansion valve comprising the coil device.

In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be described below in more detail based on the drawings and specific embodiments.

Referring to FIG. 1, FIG. 1 is a cross-sectional view of a specific embodiment of a coil device provided by the present invention.

The coil device provided by the present invention is used for an electronic expansion valve, and this coil device includes a separable housing 1 and a stator winding 2 provided in an inner chamber of the housing. The inlet of the fluid guide passage communicates with the pouring gate 3, the outlet thereof communicates with the inner chamber of the housing, and the fluid guide passage passes through the divided portion of the housing 1. During the injection molding encapsulation process, the injection molding material that has entered through the pouring gate 3 enters the fluid guide passage from the inlet and enters the inner chamber of the housing through the fluid guide passage. An encapsulating layer 9 is formed between the stator winding 2 and the stator winding 2, and after the injection molding is completed, the encapsulating material is filled in the encapsulating layer and the fluid guide passage.

The fluid guide passage is not limited to a portion where the housing 1 is divided, and the fluid guide passage may be opened at an arbitrary position of the housing 1 as long as communication between the inner chamber of the housing 1 and the pouring gate 3 can be achieved. Good.

Specifically, the fluid guide passage may be a first through hole 52 that is opened along the thickness direction of the housing 1, and the first fluid passage that is obliquely installed with respect to the thickness direction of the housing 1. The through hole 52 may be used, and the axis of the first through hole 52 may be a straight line, or may be a fold line or a curved line. The inlet of the fluid guide passage is an opening in the outer wall of the housing 1, and the outlet of the fluid guide passage is an opening in the inner wall of the housing 1.

A number of methods can be used to allow the fluid guide passage to pass through the dividing portion of the housing 1, and the housing 1 is divided into two parts, that is, the first housing 11 and the second housing 12. Specifically, the fluid guide passage has an inlet located in the first housing 11, an outlet located in the second housing 12, and the passage portions are the first housing 11 and the second housing. The fluid guide passage may be opened directly to the connection portion between the first housing 11 and the second housing 12.

The encapsulating material employed in the present invention is various injection molding materials commonly used in the art, such as ABA and ABS.

Thus, since the encapsulating material can enter the inner chamber of the housing 1 through the fluid guide passage opened in the housing 1, the enclosing of the stator winding 2 is realized in the inner chamber of the housing, and the housing 1 Neither the end faces nor most of the side walls are contained within the encapsulating part, saving encapsulating material and reducing production costs. At the same time, the fluid guide passage is filled with the injection molding material at the time of injection molding, but each individual housing part is joined by the injection molding material because the fluid guide passage passes through the divided portion of the housing 1. And a fixed connection between the parts of the housing 1 is realized, the mounting and fixing of the housing 1 is realized at the same time as the encapsulation, there is no need to use the process of welding or caulking, the damage of the coil device is avoided and production The flow is shortened and the production efficiency is improved.

Please refer to FIG. 2 together with FIG. 1, which is an orthographic view of one specific embodiment of the coil device provided by the present invention.

In one specific embodiment, the coil device provided by the present invention is provided with an injection-molded ring 4 on the outer wall of the housing 1 facing the inlet of the fluid guide passage. It is provided on the molding ring 4. During the injection molding encapsulation process, the injection molding material entering from the pouring gate 3 flows along the injection molding ring 4 to the inlet of the fluid guide passage and further enters the inner chamber of the housing. The larger the area of the injection molding ring 4 compared to the pouring gate 3, the easier it is to align the inlet of the fluid guide passage and the pouring gate 3, and the restriction on the installation position of the pouring gate 3 is released. The range in which 3 can be installed is widened.

As is apparent, the injection molding material flows between the injection molding ring 4 and the housing 1 during the injection molding, and the outer wall of the injection molding ring 4 and the housing 1 is ensured to ensure a smooth flow of the injection molding material. Should have a proper gap between.

The injection molding ring 4 is preferably installed once around the circumferential direction of the housing 1, and in this way, the injection molding material flowing from the pouring gate 3 at any position in the injection molding ring 4 is also injected into the injection molding ring 4. It can flow inside and enters the inner chamber of the housing, has a relatively good continuity in the process of injection molding, and has a relatively high efficiency. Theoretically, the injection molding ring 4 is not limited to be installed once, and the injection molding ring 4 may be installed in sections. Specifically, an injection molding ring 4 having an appropriate specification is installed in each pouring gate 3, and each inlet of the fluid guide passage is aligned with a different injection molding ring 4, that is, each pouring spout 3 has a different injection. The molding ring 4 corresponds to the inlet of each fluid guide passage, and the injection molding material flowing from each pouring gate 3 enters the inner chamber of the housing through the corresponding fluid guide passage. Usually, the first housing 11 and the second housing 12 are connected so as to be split along the radial direction of the housing, and the injection-molded ring 4 is connected to the first housing 11 and the second housing 12. By being provided at the location, the fixed connection between the two housings is realized by the injection molding material in the injection molding ring 4.

In actual operation, the injection molding ring 4 may be formed by the pouring gate 3 provided in an annular shape.

As is clear, the first housing 11 and the second housing 12 are not necessarily divided along the radial direction of the housing 1, and the purpose of dividing the housing 1 is to attach a module inside the housing 1. Therefore, it is only necessary to realize the division, and there is no particular limitation on the type and direction in which the first housing 11 and the second housing 12 are divided.

As shown in FIG. 3, the fluid guide passage may be an opening 51 provided at the edge of the first housing 11 and the second housing 12. Specifically, the opening 51 is divided into two parts, one part is opened in the first housing 11, while the other part is opened in the second housing 12, and the two parts of the opening 51 are opened. By facing the opening directions, the injection molding material smoothly enters the inner chamber of the housing, and the smooth completion of the encapsulation is ensured.

Theoretically, the opening 51 is not limited to being provided in the first housing 11 and the second housing 12, but may be provided only in the first housing 11 or provided only in the second housing 12. It may be done.

There are a plurality of the openings 51, and each opening 51 is uniformly distributed along the circumferential direction of the housing 1, and in many cases, the convenience of division is taken into consideration. The second housing 12 is divided into two upper and lower parts along the horizontal direction which is the radial direction of the housing 1, and the openings 51 are uniformly distributed in the circumferential direction of the housing 1, thereby It is useful to match the connection location with the two housings 12.

As shown in FIG. 4, a hook-shaped groove 511 may be provided at the bottom of the opening 51. After injection molding, the injection-molded layer melts and enters the hook-shaped groove 511, and The first housing and the second housing can be fixed in the axial direction, the separation of the two portions of the housing is prevented, and the mounting reliability of the housing 1 is improved.

The fluid guide passage is not limited to the opening 51, and may be a first through hole 52 provided in a side wall of the first housing 11 and / or the second housing 12. There may be a plurality of first through holes 52, and each first through hole 52 may be uniformly distributed along the circumferential direction of the housing 1.

The first through hole 52 and the opening 51 are preferably provided simultaneously. At this time, the action of the first through hole 52 mainly realizes axial fixation of the first housing 11 and the second housing 12 and prevents the first housing 11 and the second housing 12 from being separated. Therefore, it is an auxiliary function of the first through hole 52 that is used as the fluid guide passage.

The pouring gate 3 of the mold used in the present invention may be various types of pouring gates 3 which are usually used in this field, such as a square mouth and a circular mouth. Preferably, as shown in FIG. 5, the location connected to the injection molding ring 4 may adopt the structure of a transition enclosing portion, and a submarine gate-shaped pouring gate is adopted for the transition enclosing portion 41 when the injection molding is enclosed. May be. As is apparent, the pouring gate 3 provided by the present invention is not limited to the above-described installation method, and may be various types of pouring gates 3 that are normally used in the art.

Further improvements may be made to the coil device provided by the present invention.

Referring to FIG. 6, FIG. 6 is a schematic configuration diagram of another specific embodiment of the coil device provided by the present invention.

In another preferred embodiment, the coil device provided by the present invention is such that the inlet of the fluid guide passage and the pouring gate 3 are placed opposite to each other, the inlet of the fluid guide passage and the pouring gate 3 are directly aligned, and the pouring gate is provided. The injection molding material entered from 3 enters the fluid guide passage directly from the inlet and further enters the inner chamber of the housing 1. In this way, the flow path of the injection molding material is shortened, and the waste of the injection molding material is further avoided. At the same time, it is not necessary to provide the injection molding ring 4 in the housing 1, the configuration of the apparatus is simplified, and the production manufacturing cost is reduced. Saved.

Obviously, the configuration in which the injection-molded ring 4 is not provided may be understood as an embodiment in which the thickness of the injection-molded ring 4 described in the specific embodiment is minimized.

In this embodiment, the structure of the injection molding ring 4 is canceled and only the positions of the pouring gate 3 and the fluid guide passage inlet are limited, and the other configurations are the same as those of the first specific embodiment.

In particular, it should be explained that words indicating the order such as “first, second” and the like in the specification are for distinguishing different configurations of the same name, and do not represent a certain order. It should not be understood as being limited to either.

Hereinafter, taking the first specific embodiment as an example, the enclosing and mounting process of the coil device provided by the present invention will be briefly described.

Referring to FIG. 7, FIG. 7 is a flow schematic diagram of a kind of enclosing mounting process of the coil device provided by the present invention.

A certain number of enamel wires 62 are wound around the skeleton 61 of the coil device, and the enamel wire 62 is wound around an insertion needle 63 fixed to the skeleton 61 and soldered. And the insertion needle 63 are electrically connected, and the stator winding 2 is formed. Before being inserted into the mold hole, the housing 1 and the electromagnetic electrode plate 64 are attached to the stator winding 2, and the stator module 7 is formed by stacking the two mounted members. 7 is placed in an injection mold hole, and after the resin is melted and fixed, a coil injection molded member 8 is formed. The coil stator winding 2 is insulated and the axial directions and radial directions of the first housing 11 and the second housing 12 are set. Positioning is realized. At the time of production, the annular injection molding ring 4 may be formed by rectangular pouring gates 3 distributed along the circumference in the mold cavity.

Referring to FIGS. 10 and 11, FIG. 10 is a schematic configuration diagram of a specific embodiment of a coil device provided by the present invention, and FIG. 11 is a schematic configuration diagram of a housing in the coil device shown in FIG. 10. FIG.

The coil device provided by the present invention is used for an electronic expansion valve, and the coil device includes a coil skeleton 61 around which a certain number of enamel wires 62 are wound, and the enamel wire 62 is the coil skeleton. The wire is wound around the insertion needle 63 fixed to 61, and the electrical connection between the enamel wire 62 and the insertion needle 63 is realized by a method such as soldering to form a coil stator winding. A stator module is formed after the housing 1 and the electromagnetic electrode plate 64 are attached to the stator windings on the upper and lower sides, respectively, and then the stator module is formed, and then the stator module is placed in an injection mold hole and melted by thermosetting or thermoplastic resin. A coil injection molding member is formed after fixing. The coil device includes a housing 1 having an inner chamber and a positioning element 42 connected to a valve body of an electronic expansion valve. The housing 1 has an injection molding passage, and when the coil device is sealed, The injection molding material reaches the end surface 13 of the housing 1 through the injection molding passage, and the positioning element 42 is formed on the end surface 13 of the housing 1.

In this manner, the positioning element 42 can be integrally injection-molded simultaneously with the enclosing of the coil device, and it is not necessary to add a separate welding step to realize the fixing of the positioning element 42 and the housing 1. And the mounting process of the housing 1 is reduced, and the coil processing cost is reduced. At the same time, in the injection molding process, the resin material is used for filling and forming, so that the electrochemical corrosion generated in the welding process is avoided, the rust corrosion of the housing 1 is avoided, and the useful life of the coil device is extended.

In a specific embodiment, the coil device provided by the present invention includes a second through hole 43 in which an injection molding passage is opened in the housing end surface 13, and an entrance end of the second through hole 43 is a housing. 1 and the outlet end is located on the end face 13. When the coil device is sealed, the resin material for injection molding is filled in the inner chamber of the housing 1 and flows to the end surface 13 of the housing 1 through the injection molding passage, and the positioning element 42 is formed on the end surface 13. Thus, since the second through hole 43 opened in the housing end surface 13 in the axial direction becomes an injection molding passage, the configuration becomes relatively simple, and the manufacturing cost can be saved.

The second through hole 43 may be opened along the thickness direction of the housing 1, or may be the second through hole 43 installed to be inclined with respect to the thickness direction of the housing 1. . The axis of the second through hole 43 may be a straight line, and may be a fold line or a curved line.

The outer diameter of the outlet end of the second through hole 43 is larger than the outer diameter after the skeleton 61 of the coil device is bonded to the end surface 13. In this way, after the skeleton 61 of the coil device and the housing 1 are mounted, the outlet end of the second through hole 43 is not completely shielded, and a resin material flow passage can be formed during injection molding. Can be guaranteed.

Theoretically, if it can be ensured that the second through hole 43 can communicate with the housing end surface 13 and the inner chamber after mounting, the positioning element 42 may be formed on the end surface 13. The specific outer diameter of the outlet end of the hole 43 is not particularly limited, and is not particularly limited to being larger than the outer diameter of the portion where the skeleton 61 and the end face 13 are bonded together, and it is sufficient that the resin material can pass smoothly.

The cross section of the outlet end of the second through hole 43 may be oval, and may be any other shape, such as a circle, a square, or other regular or irregular shape. The cross-sectional shape of each part of the second through hole 43 may be the same, that is, each part may be circular, or each part may be square. Is circular, while the exit end may be any form such as other shapes. The outer diameter of each part of the 2nd through-hole 43 may be equal, may differ slightly, and can be decided according to an actual use condition.

A plurality of the second through holes 43 may be provided, and each second through hole 43 is uniformly distributed along the circumferential direction of the end face 13, so that the positioning element 42 is formed during the injection molding process. The resin material for injection molding is simultaneously conveyed to the plurality of second through holes 43, the injection molding efficiency of the positioning element 42 is improved, and the molding uniformity of the positioning element 42 is guaranteed.

Specifically, the number of the second through holes 43 may be six, eight, or a large number, and each second through hole 43 is preferably distributed uniformly in the circumferential direction of the end surface 13. It may be provided non-uniformly.

Further improvements may be made to the above specific embodiments.

Referring to FIG. 12, FIG. 12 is a schematic diagram of the configuration of another specific embodiment of the coil device provided by the present invention.

In another specific embodiment, the coil device provided by the present invention further includes an extension 44 provided in the side wall 14 of the housing 1 in the injection molding passage, the extension 44 being an entrance. The end is provided in the injection molding ring 4 of the coil device, and the outlet end is provided on the end face 13. At the time of sealing, the resin material for injection molding in the inner chamber of the housing also enters by the injection molding ring 4, and the extending portion 44 is installed between the injection molding ring 4 and the end surface 13 of the housing 1, whereby the upper positioning element 42. The resin material for injection molding reaches the end face 13 directly from the injection molding ring 4 so as to be formed. Thus, by adding the structure of the extending portion 44 in the injection molding passage, the injection molding of the positioning element 42 is realized together with the second through hole 43, the injection molding efficiency of the positioning element 42 is improved, and the positioning is performed. The connection strength between the element 42 and the encapsulating layer portion is improved.

The extending portion 44 may be provided on the side wall 14 along the thickness direction of the housing 1 or may be installed on the side wall 14 so as to be inclined with respect to the thickness direction. The extending axis of the extending portion 44 may be a straight line, a fold line, a curved line, or the like.

There may be a plurality of extending portions 44 provided by the present invention, and each extending portion 44 is uniformly distributed in the housing 1 along the circumferential direction, whereby the injection molding efficiency of the positioning element 42 is improved. In addition, the uniformity of the injection molding of the positioning element 42 is improved.

Specifically, the number of the extending portions 44 may be four, and may be two, five, or other numbers.

In particular, in different embodiments, the extending portion 44 may coexist with the second through hole 43, and the function of the second through hole 43 without the second through hole 43 being provided. Instead of this, only the extension 44 may be provided.

Except for the coil device, the present invention further provides an electronic expansion valve provided with the coil device, and the configuration of the electronic expansion valve may refer to the prior art, and is not a luxury here.

The electronic expansion valve and its coil device provided by the present invention have been described in detail above. Although specific individual examples have been applied herein to describe the principles and embodiments of the present invention, the description of the above examples merely assists in understanding the method of the present invention and its spirit. It should be particularly explained to those skilled in the art that the present invention may be slightly improved and modified without departing from the principle of the present invention, and these improvements and modifications fall within the protection scope of the claims of the present invention. To do.

DESCRIPTION OF SYMBOLS 1 ... Housing 11 ... 1st housing 12 ... 2nd housing 13 ... End surface 14 ... Side wall 2 ... Stator winding 3 ... Injection gate 4 ... Injection molding Ring 41 ... Transition enclosing part 51 ... Opening 511 ... Hook-like groove 52 ... First through hole 61 ... Skeleton 62 ... Enamel wire 63 ... Insert needle 64 .. Electromagnetic electrode plate 7... Stator module 8... Coil injection molding member 9... Encapsulation layer 42... Positioning element 43.

Claims (18)

In a coil device used for an electronic expansion valve, comprising a splitable housing (1) and a stator winding (2) provided in the inner chamber of the housing,
The housing (1) is provided with a fluid guide passage, an inlet of the fluid guide passage communicates with a pouring gate (3), and an outlet thereof communicates with an inner chamber of the housing. Coil device used for valves.   The coil device used for the electronic expansion valve according to claim 1, wherein the fluid guide passage passes through a divided portion of the housing (1).   The outer wall of the housing (1) is provided with an injection molding ring (4) facing the inlet of the fluid guide passage, and the pouring gate (3) is provided in the injection molding ring (4). The coil apparatus used for the electronic expansion valve according to claim 1 or 2. The housing (1) includes a first housing (11) and a second housing (12) that are detachably connected along a radial direction,
The said injection molding ring (4) is used for the electronic expansion valve of Claim 3 provided in the connection location of the said 1st housing (11) and the said 2nd housing (12). Coil device.   5. The fluid guide passage according to claim 4, wherein the fluid guide passage is an opening (51) provided at an edge of the first housing (11) and / or the second housing (12). Coil device used for electronic expansion valves. The electronic expansion valve according to claim 5, wherein there are a plurality of the openings (51), and each of the openings (51) is uniformly distributed along a circumferential direction of the housing (1). Coil device used. The coil device used for the electronic expansion valve according to claim 6, wherein a hook-shaped groove (511) is provided at a bottom of the opening (51). 5. The electron according to claim 4, wherein the fluid guide passage is a through hole (52) provided in a side wall of the first housing (11) and / or the second housing (12). Coil device used for expansion valves. The electronic expansion valve according to claim 7, wherein there are a plurality of through holes (52), and each through hole (52) is uniformly distributed along a circumferential direction of the housing (1). Coil device used. The coil device used for the electronic expansion valve according to claim 1 or 2, wherein an inlet of the fluid guide passage is disposed opposite to the pouring gate (3). In the coil device used for the electronic expansion valve, comprising a housing (1) having an inner chamber and a positioning element (42) connected to the valve body of the electronic expansion valve,
An injection molding passage is opened in the housing (1), and when the coil device is sealed, the injection molding material reaches the end surface (13) of the housing (1) through the injection molding passage, and the housing. A coil device used for an electronic expansion valve, wherein the positioning element (42) is formed on an end face (13) of (1). The injection molding passage includes a second through hole (43) opened in the end face (13), and an entrance end of the second through hole (43) is formed in an inner chamber of the housing (1). The coil device used for an electronic expansion valve according to claim 11, wherein the coil device is located and an outlet end thereof is located on the end face (13). The outer diameter of the outlet end of the second through hole (43) is larger than the outer diameter after the skeleton (61) of the coil device and the end face (13) are bonded together. A coil device used for the electronic expansion valve according to 12. The said 2nd through-hole (43) is provided with two or more, Each said through-hole (43) is uniformly distributed along the circumferential direction of the said end surface (13). The coil apparatus used for the electronic expansion valve of description. The coil device used for the electronic expansion valve according to claim 14, wherein a cross section of an outlet end of the second through hole (43) is oval. The injection molding passage includes an extending portion (44) provided on a side wall (14) of the housing (1),
The entrance end of the extension part is provided in an injection molding ring (4) of the coil device, and the exit end thereof is provided in the end face (13). A coil device used for the electronic expansion valve according to any one of 15. 17. The electronic expansion according to claim 16, wherein there are a plurality of extending portions (44), and each extending portion (44) is uniformly distributed in the housing (1) along a circumferential direction. Coil device used for valves. In an electronic expansion valve comprising a valve body and a coil device provided in the valve body,
The said coil apparatus is a coil apparatus of any one of Claims 1 thru | or 17, The electronic expansion valve characterized by the above-mentioned.

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