CN112151229B

CN112151229B - Electromagnetic coil device

Info

Publication number: CN112151229B
Application number: CN201910844561.2A
Authority: CN
Inventors: 郑利峰; 张积友; 魏斌
Original assignee: Zhejiang DunAn Hetian Metal Co Ltd
Current assignee: Zhejiang DunAn Hetian Metal Co Ltd
Priority date: 2019-06-28
Filing date: 2019-09-06
Publication date: 2022-06-17
Anticipated expiration: 2039-09-06
Also published as: CN112151229A

Abstract

The present invention provides an electromagnetic coil device, including: the coil is wound on the wheel frame, and an inner cavity is formed inside the wheel frame; the stator shell is sleeved outside the wheel carrier, and a cavity opening is formed in the position, corresponding to the inner cavity, of the stator shell; and the encapsulating layer is coated on the whole side wall of the stator shell and the end wall of the stator shell in an injection molding mode and is not coated on the cavity wall of the inner cavity in an injection molding mode. The encapsulating layer of the electromagnetic coil device is completely coated on the whole side wall of the stator shell, so that the side wall of the stator shell can be effectively protected, the collision and corrosion of the stator shell are prevented, the integrity of the stator shell can be ensured by the matching of the encapsulating layer at the side wall and the encapsulating layer at the end wall, meanwhile, the encapsulating layer is not injected on the cavity wall of the inner cavity, the injection pressure in the injection process is reduced, the phenomenon that the coil is deformed due to the overlarge injection pressure in the injection process is effectively avoided, and the smooth installation of a structure filled into the inner cavity is ensured due to the fact that no encapsulating layer exists at the pole teeth.

Description

Electromagnetic coil device

The invention claims patent priority of invention with application date of 2019, 6 and 28 and application number of 201910578880.3 and named as electromagnetic coil device.

Technical Field

The invention relates to the technical field of electromagnetic coil equipment, in particular to an electromagnetic coil device.

Background

In the field of throttling devices, an electronic expansion valve plays a vital role, the electronic expansion valve comprises a valve body and a coil device arranged in the valve body, wherein an electromagnetic coil device is a driving source for the electronic expansion valve to work, and a magnetic field generated by electrifying the coil device drives the valve body to move so as to realize a valve function. The solenoid device mainly includes the main part, the utmost point tooth, the valve body, the wire winding, the contact pin etc. accomplish the equipment back at above-mentioned part, can be through moulding plastics in the outside and inside coating that forms of main part of coil device, at present adopt the resin cladding usually, in some schemes, the resin cladding is at main part lateral wall, end wall and inner hole wall, but the coating setting is inside the main part, in the in-process of moulding plastics, the pressure of moulding plastics in the hole often leads to the coil to warp, and easily cause the utmost point tooth to be wrapped by the coating, lead to the inside valve body installation of main part not smooth.

Disclosure of Invention

The invention mainly aims to provide an electromagnetic coil device, which solves the problem that the electromagnetic coil device in the prior art is easy to cause coil deformation in the injection molding process.

In order to achieve the above object, the present invention provides an electromagnetic coil device including: the coil is wound on the wheel frame, and an inner cavity is formed inside the wheel frame; the stator pole plate comprises a plate body and pole teeth arranged on the plate body, the plate body is arranged at the end part of the wheel frame, and the pole teeth are positioned in the inner cavity; the stator shell is sleeved outside the wheel carrier, and a cavity opening is formed in the position, corresponding to the inner cavity, of the stator shell; and the encapsulating layer is coated on the whole side wall of the stator shell and the end wall of the stator shell in an injection molding mode and is not coated on the cavity wall of the inner cavity in an injection molding mode.

Further, the encapsulating layer is partially coated on the end wall, and the encapsulating layer is coated from the outer edge of the end wall in the direction of the cavity opening.

Furthermore, the area of the encapsulating layer close to the cavity opening is provided with a non-encapsulating cylindrical cavity, and the non-encapsulating cylindrical cavity and the inner cavity are arranged coaxially.

Further, the electromagnetic coil device further comprises a cover body which is covered on the end wall of the stator shell to seal the cavity opening.

Further, the cover body is joined to the end wall of the stator housing by ultrasonic welding.

Further, the inside of the cover body is provided with a matching bulge, the matching bulge is arranged in the non-packaging cylindrical cavity in a penetrating mode and is in interference fit with the inner wall of the non-packaging cylindrical cavity, and a welding ring is arranged on the outer edge of the cover body.

Furthermore, the shape of the matching bulge is matched with that of the cavity opening, and a boss is arranged on the end face of one end, far away from the stator shell, of the cover body.

Further, the electromagnetic coil device further comprises a wire assembly, the wire assembly comprising: the first end of the contact pin is connected with the leading-out end of the coil; the second end of the contact pin is connected with the circuit board; the lead is connected with the circuit board; the wire assembly further comprises an insulating shell, the insulating shell is connected to the encapsulating layer, an intermediate cavity is formed between the insulating shell and the encapsulating layer, the circuit board is located in the intermediate cavity, and the insulating fixing layer is filled in the intermediate cavity.

Furthermore, the insulating fixing layer is formed by filling epoxy glue, and the insulating shell and the encapsulating layer are connected together through ultrasonic welding.

Furthermore, a through hole is formed in the circuit board, and the second end of the contact pin penetrates through the through hole and is connected to the circuit board through soldering tin; a needle head of the second end of the contact pin, which penetrates through the circuit board, is positioned in the middle cavity, and the insulating fixing layer surrounds the needle head; be provided with a plurality of protruding structures on the internal surface of insulating casing, protruding structure all extends along the length direction of perpendicular to lead wire, and a plurality of protruding structures set up along the length direction interval that is on a parallel with the lead wire to increase and insulating fixed layer's area of contact.

By applying the technical scheme, the encapsulating layer of the electromagnetic coil device is completely coated on the whole side wall of the stator shell, so that the side wall of the stator shell can be effectively protected, the collision and corrosion of the stator shell are prevented, the integrity of the stator shell can be ensured by the matching of the encapsulating layer at the side wall and the encapsulating layer at the end wall, meanwhile, the encapsulating layer is not injected on the cavity wall of the inner cavity, the injection pressure in the injection molding process is reduced, the phenomenon that the coil is deformed due to the overlarge injection pressure in the injection molding process is effectively avoided, and the installation smoothness of a structure filled into the inner cavity is also ensured due to the fact that no encapsulating layer exists at the pole teeth.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 schematically illustrates a partial cross-sectional view of an embodiment of an electromagnetic coil apparatus of the present invention;

FIG. 2 schematically illustrates a top view of an embodiment of the electromagnetic coil apparatus of the present invention;

FIG. 3 is a block diagram schematically illustrating an embodiment of the electromagnetic coil device of the present invention;

fig. 4 schematically shows an exploded view of an embodiment of the wire winding assembly of the electromagnetic coil device of the present invention.

Wherein the figures include the following reference numerals:

10. a wheel carrier; 11. an inner cavity; 12. pole teeth; 13. an end wall; 14. a plate body; 15. a stator housing; 20. a coil; 30. an encapsulation layer; 31. no encapsulated cylindrical cavity; 40. a cover body; 41. a mating protrusion; 42. a boss; 43. welding a ring; 50. inserting a pin; 51. a circuit board; 52. a lead wire; 53. an insulating case; 60. and an insulating fixing layer.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

As described in the background art, resin coating is generally adopted at present, in some schemes, the resin coating is applied to a side wall, an end wall and an inner hole wall of a main body, but the coating layer is arranged inside the main body, and in the injection molding process, the coil is often deformed due to the injection molding pressure in the inner hole, and the polar teeth are easily coated by the coating layer, so that the valve body inside the main body is unsmooth to install.

In order to solve the above problems, referring to fig. 1 to 4, an embodiment of the present invention provides an electromagnetic coil device, including a wheel frame 10, a stator pole plate and a stator housing 15, wherein a coil 20 is wound on the wheel frame 10, and an inner cavity 11 is formed inside the wheel frame 10; the stator pole plate comprises a plate body 14 and pole teeth 12 arranged on the plate body 14, the plate body 14 is arranged at the end part of the wheel frame 10, and the pole teeth 12 are positioned in the inner cavity 11; the stator shell 15 is sleeved outside the wheel carrier 10, and a cavity opening is formed in the position, corresponding to the inner cavity 11, of the stator shell 15; the encapsulating layer 30 of the electromagnetic coil device is completely coated on the whole side wall of the stator shell 15 and the end wall 13 of the stator shell 15, and is not injected on the cavity wall of the inner cavity 11, the encapsulating layer 30 of the electromagnetic coil device can effectively protect the side wall of the stator shell, so that collision and corrosion of the stator shell can be prevented, the integrity of the stator shell can be ensured due to the matching of the encapsulating layer at the side wall and the encapsulating layer at the end wall, meanwhile, the encapsulating layer is not injected on the cavity wall of the inner cavity, so that the injection pressure in the injection molding process is reduced, the phenomenon that a coil is deformed due to overlarge injection pressure in the injection molding process is effectively avoided, and the installation smoothness of a structure filled into the inner cavity is also ensured due to the fact that no encapsulating layer is arranged at a pole tooth.

The wheel carrier 10, the stator pole plates and the stator shell 15 form a group of winding assemblies, the electromagnetic coil device of the embodiment is provided with two winding assemblies which are coaxially arranged, and the stator pole plates of the two winding assemblies are connected together. Referring to fig. 1, the encapsulating layer 30 of the present embodiment partially covers the end wall 13, and the encapsulating layer 30 covers the end wall 13 along the direction toward the cavity opening. Specifically, the area of the encapsulating layer near the cavity opening in the embodiment is provided with the non-encapsulating cylindrical cavity 31, the non-encapsulating cylindrical cavity 31 is arranged coaxially with the inner cavity 11, and in the embodiment of the two winding assemblies, the encapsulating layers at the end walls of the two stator shells are provided with the non-encapsulating cylindrical cavities 31.

In order to prevent external moisture from entering the coil, the insulating performance of the coil is better, and meanwhile, the internal pole teeth are prevented from being corroded due to long-time exposure in the air, the electromagnetic coil device in the embodiment further comprises a cover body 40, the cover body 40 is arranged on the end wall 13 of the stator shell 15 in a covering mode to seal a cavity opening, the cover body 40 is used for sealing, external moisture, dust and the like are prevented from entering the inner cavity, and therefore the pole teeth in the inner cavity are prevented from being corroded.

To ensure the tightness, the cover 40 in this embodiment is attached to the end wall 13 of the stator housing 15 by ultrasonic welding.

In the embodiment, the matching protrusion 41 is arranged inside the cover body 40, the matching protrusion 41 is arranged in the non-encapsulation cylindrical cavity 31 in a penetrating manner and is in interference fit with the inner wall of the non-encapsulation cylindrical cavity 31, and the matching protrusion 41 is arranged inside the cover body 40 and is matched with the inner wall of the non-encapsulation cylindrical cavity 31, so that the sealing performance of the cover body is further ensured. In one embodiment, the outer edge of the cover is provided with a welding ring 43, which welding ring 43 melts and bonds the envelope layer 30 together when welding is performed by ultrasonic welding.

In order to facilitate holding and installation of the cover body, the shape of the engaging protrusion 41 in this embodiment is matched with the shape of the cavity opening, and a boss 42 is provided on the end surface of the end of the cover body 40 away from the stator housing 15.

Referring to fig. 1, the electromagnetic coil device in the present embodiment further includes a wire assembly including: a pin 50, wherein the first end of the pin 50 is connected with the leading-out end of the coil 20; the second end of the pin 50 is connected with the circuit board 51; a lead 52, wherein the lead 52 is connected with the circuit board 51; the wire assembly further comprises an insulating shell 53, the insulating shell 53 is connected to the encapsulating layer 30, an intermediate cavity is formed between the insulating shell 53 and the encapsulating layer 30, the circuit board 51 is located in the intermediate cavity, and the insulating fixing layer 60 is filled in the intermediate cavity.

In order to fix and insulate the pins, the circuit board and the leads, the insulating fixing layer 60 in this embodiment is formed by filling epoxy glue, and the insulating shell 53 and the encapsulating layer 30 are connected together by ultrasonic welding. In a preferred embodiment, the end wall of the insulating housing 53 on the side facing the cover is provided with a welding bead, the inner wall of which is adapted to the outer wall of the envelope layer, which welding bead melts and bonds the envelope layer 30 together when the welding is carried out by ultrasonic welding.

Specifically, in order to make the pin and the circuit board more closely fit, the circuit board 51 in this embodiment is provided with a through hole, and the second end of the pin 50 passes through the through hole and is connected to the circuit board 51 by soldering; the pins of the second end of the pins 50 which pass through the circuit board 51 are located in the middle cavity, and the insulating fixing layer 60 surrounds the pins; a plurality of protruding structures are disposed on the inner surface of the insulating case 53, the protruding structures each extend in a direction perpendicular to the length direction of the lead 52, and a plurality of protruding structures (not shown) are spaced apart in a direction parallel to the length direction of the lead 52 to increase the contact area with the insulating fixing layer 60, so that the insulating fixing layer can be more stably connected in the middle cavity.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:

the encapsulating layer of the electromagnetic coil device is completely coated on the whole side wall of the stator shell, so that the side wall of the stator shell can be effectively protected, the collision and corrosion of the stator shell are prevented, the integrity of the stator shell can be ensured by the matching of the encapsulating layer at the side wall and the encapsulating layer at the end wall, meanwhile, the encapsulating layer is not injected on the cavity wall of the inner cavity, the injection pressure in the injection process is reduced, the phenomenon that the coil is deformed due to the overlarge injection pressure in the injection process is effectively avoided, and the smooth installation of a structure filled into the inner cavity is ensured due to the fact that no encapsulating layer exists at the pole teeth.

It should be noted that the above detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein.

Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Spatially relative terms, such as "above … …", "above … …", "above … …", "above", and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures.

For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In the above detailed description, reference is made to the accompanying drawings, which form a part hereof. In the drawings, like numerals typically identify like components, unless context dictates otherwise. The illustrated embodiments described in the detailed description, drawings, and claims are not meant to be limiting. Other embodiments may be utilized, and other changes may be made, without departing from the spirit or scope of the subject matter presented here. It will be readily understood that the aspects of the present disclosure, as generally described herein, and illustrated in the figures, can be arranged, substituted, combined, separated, and designed in a wide variety of different configurations, all of which are explicitly contemplated herein.

The present disclosure in accordance with certain embodiments described herein is not to be limited in scope by the specific aspects illustrated. As will be apparent to those skilled in the art, many modifications and variations are possible without departing from the spirit and scope of the disclosure. Functionally equivalent methods and apparatuses, in addition to those enumerated herein, will be apparent to those skilled in the art from the foregoing description, within the scope of the present disclosure. Such modifications and variations are intended to fall within the scope of the appended claims. The disclosure is to be limited only by the terms of the appended claims, along with the full scope of equivalents to which such claims are entitled. It is to be understood that this disclosure is not limited to particular methods, reagents, compounds, compositions or biological systems, which can, of course, vary. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An electromagnetic coil device, characterized by comprising:

the coil winding device comprises a wheel carrier (10), wherein a coil (20) is wound on the wheel carrier (10), and an inner cavity (11) is formed in the wheel carrier (10);

the stator pole plate comprises a plate body (14) and pole teeth (12) arranged on the plate body (14), the plate body (14) is installed at the end part of the wheel frame (10), and the pole teeth (12) are located in the inner cavity (11);

the stator shell (15) is sleeved outside the wheel carrier (10), and a cavity opening is formed in the position, corresponding to the inner cavity (11), of the stator shell (15);

the encapsulating layer (30), the encapsulating layer (30) is coated on the whole side wall of the stator shell (15) and the end wall (13) of the stator shell (15) in an injection molding mode and is not coated on the cavity wall of the inner cavity (11), and an area, close to a cavity opening, of the encapsulating layer (30) is provided with an encapsulating-free cylindrical cavity (31);

the electromagnetic coil device further comprises a cover body (40), wherein the cover body (40) is arranged on the end wall (13) of the stator shell (15) in a covering mode to seal the cavity opening;

the inner part of the cover body (40) is provided with a matching bulge (41), and the matching bulge (41) penetrates through the non-encapsulation cylindrical cavity (31) and is in interference fit with the inner wall of the non-encapsulation cylindrical cavity (31).

2. The electromagnetic coil device according to claim 1, characterized in that the envelope layer (30) partially covers the end wall (13), the envelope layer (30) covering from the outside of the end wall (13) in the direction of the orifice.

3. The electromagnetic coil device according to claim 2, characterized in that the non-enveloping cylindrical cavity (31) is arranged coaxially with the inner cavity (11).

4. The electromagnetic coil device according to claim 3, characterized in that the cover body (40) is connected to the end wall (13) of the stator housing (15) by ultrasonic welding.

5. The electromagnetic coil device according to claim 4, characterized in that the outer edge of the cover body (40) is provided with a welding ring (43).

6. The electromagnetic coil device as set forth in claim 5, characterized in that the shape of the fitting projection (41) is adapted to the shape of the cavity opening, and an end face of the cover body (40) at an end remote from the stator housing (15) is provided with a boss (42).

7. The electromagnetic coil device according to claim 1, further comprising a wire assembly, the wire assembly comprising:

a pin (50), wherein a first end of the pin (50) is connected with a leading-out end of the coil (20);

the second end of the contact pin (50) is connected with the circuit board (51);

a lead (52), wherein the lead (52) is connected with the circuit board (51);

the wire assembly further comprises an insulating shell (53), the insulating shell (53) is connected to the encapsulating layer (30), an intermediate cavity is formed between the insulating shell (53) and the encapsulating layer (30), the circuit board (51) is located in the intermediate cavity, and an insulating fixing layer (60) is filled in the intermediate cavity.

8. The electromagnetic coil device according to claim 7, characterized in that the insulating fixing layer (60) is formed by filling epoxy glue, and the insulating shell (53) and the encapsulating layer (30) are connected together by ultrasonic welding.

9. The electromagnetic coil device according to claim 7, characterized in that the circuit board (51) is provided with a through hole, and the second end of the pin (50) passes through the through hole and is connected to the circuit board (51) by soldering; the needle head of the second end of the contact pin (50) penetrating through the circuit board (51) is positioned in the middle cavity, and the insulating fixing layer (60) surrounds the needle head; a plurality of protruding structures are arranged on the inner surface of the insulating shell (53), the protruding structures extend along the length direction perpendicular to the lead (52), and the protruding structures are arranged at intervals along the length direction parallel to the lead (52) so as to increase the contact area with the insulating fixing layer (60).