JP2023528186A - Coil bobbin and coil - Google Patents

Abstract

a winding part (11), a first end ring (12) and a second end ring (13) provided at both ends of the winding part (11), a connection part (14) provided at the outer edge of the first end ring (12), and a pin mounting part (15) provided at one side of the connection part (14) away from the first end ring (12), wherein the connection part (14) is provided with a waterproof structure and is waterproof. The structure includes two outer waterproof ribs (16) and at least one intermediate waterproof rib (17) located between the two outer waterproof ribs (16), the outer waterproof rib (16) having a tip to facilitate fusing with the injection molding material, the coil bobbin and coil. [Selection drawing] Fig. 1

Description

(Related application)
This application claims the priority of the Chinese patent application with application number 202021706863.8 and titled "Coil Bobbin and Coil" filed on Aug. 14, 2020, the entire content of which is hereby incorporated by reference. incorporated into the application.

The present application relates to the technical field of electromagnetic coils, and more particularly to coil bobbins and coils.

At present, the coil of the electronic expansion valve includes a coil bobbin, an enameled wire, an electromagnetic pole plate, a pin and a housing. Both ends are welded to pins, then the electromagnetic pole plate and housing are assembled, and finally packaged and injection molded.

In the prior art, a coil bobbin includes a winding tube and end rings provided at both ends of the winding tube, one end ring is provided with a connection plate, and the connection plate has a pin attachment for attaching a pin. structure is provided. To prevent water from flowing from the end ring to the pin mounting structure, the connecting plate is provided with three watertight bumps, with watertight grooves formed between adjacent watertight bumps. However, since the top of the waterproof bump is relatively thick, the heat of the injection molding material is insufficient to melt the top of the waterproof bump during injection molding, and the coil bobbin and the injection molding material are combined after molding. When there is a defective part and the coil is in a submerged state, water is likely to seep into the coil, and the water will penetrate the pin mounting structure along the end ring, causing the insulation performance of the coil to fail, and the product will be damaged. It will not be possible to meet the insulation performance requirements of

In view of this, the present application proposes a coil bobbin and a coil to solve the problem that the top of the waterproof bump in the prior art is relatively thick and cannot be completely fused with the injection molding material, and the insulation performance of the coil fails. must be provided.

The coil bobbin provided in the present application includes a winding portion, first and second end rings provided at both ends of the winding portion, and a connecting portion provided at the outer edge of the first end ring. , a pin mounting portion provided on one side of the connecting portion remote from the first end ring, wherein the connecting portion is provided with a waterproof structure, the waterproof structure comprising two outer waterproof ribs. and at least one intermediate waterproof rib located between two outer waterproof ribs, the outer waterproof rib having a tip to facilitate fusing with the injection molding material.

By providing in this way, the tip end is easily melted into the injection molding material during injection molding, the waterproof rib and the injection molding material are effectively fused together, and the coil bobbin and the injection molding material are in good condition after molding. effectively prevent moisture from penetrating into the pin mounting part along the end face of the first end ring, improve the insulation performance of the coil, and meet the insulation performance requirements of the product.

In one embodiment, the surface of the intermediate waterproof rib is curved to increase the penetration distance.

By providing in this way, moisture is prevented from penetrating into the pin mounting holes in the pin mounting portion along the end surface of the first end ring, and furthermore, the insulation performance of the coil is improved.

In one embodiment, the curved surface is a semi-circular surface,
Alternatively, the curved surface includes two first arcuate surfaces connected to each other and curved inwardly.

By providing in this way, the processing is convenient and the manufacturing cost is reduced.

In one embodiment, the curved surface includes a first angled surface, a planar surface and a second angled surface connected in sequence, the first angled surface and the second angled surface both being the end surface of the first end ring. and the plane is parallel to the end face.

By providing in this way, the processing is convenient and the manufacturing cost is reduced.

In one embodiment, the first slanted surface and the plane make an obtuse included angle and the second slanted surface and the plane make an obtuse included angle.

By providing in this way, the processing of the intermediate waterproof rib is facilitated, and the degree of processing difficulty is reduced.

In one embodiment, the surface of the outer waterproof rib includes a vertical surface and a second arcuate surface connected to each other, the vertical surface being perpendicular to the end face of the first end ring, or the surface of the outer waterproof rib. The cross section has an inverted V shape.

By providing in this way, the processing is convenient and the manufacturing cost is reduced.

In one embodiment, the waterproof structure further includes a ridge, both the outer waterproof rib and the intermediate waterproof rib are provided on the ridge, and at least one side surface of the ridge is provided with a first ridge for increasing the penetration distance. A groove is provided.

By providing in this way, moisture is prevented from penetrating into the pin mounting holes in the pin mounting portion along the end surface of the first end ring, and furthermore, the insulation performance of the coil is improved.

In one embodiment, the cross-sectional shape of the first groove is semicircular.

By providing in this way, the processing is convenient and the manufacturing cost is reduced.

In one embodiment, the connecting portion is further provided with a second groove, the second groove being located between the first end ring and the waterproof structure and/or two Two outer waterproof ribs are provided symmetrically with respect to the centerline of the surface of the intermediate waterproof rib.

By providing in this way, the penetration distance of the second concave groove can be increased, and the two outer waterproof ribs are provided symmetrically, which facilitates processing and reduces manufacturing costs.

The present application further provides a coil comprising the coil bobbin described above.

Compared with the prior art, the coil provided in the present application has advantages such as good waterproof performance, good insulation performance, and convenient processing.

It is a three-dimensional schematic diagram of a coil bobbin in the first embodiment of the present application. FIG. 2 is a schematic cross-sectional view of the coil bobbin of FIG. 1; 3 is a schematic partial cross-sectional view of the coil bobbin of FIG. 2; FIG. 1 is a three-dimensional schematic diagram of a coil of the present application; FIG. FIG. 5 is a partial three-dimensional schematic diagram of the coil of FIG. 4; FIG. 4 is a three-dimensional schematic diagram of a coil bobbin in a second embodiment of the present application; FIG. 7 is a schematic cross-sectional view of the coil bobbin of FIG. 6; FIG. 8 is a schematic partial cross-sectional view of the coil bobbin of FIG. 7; FIG. 11 is a three-dimensional schematic diagram of a coil bobbin in a third embodiment of the present application; FIG. 10 is a schematic cross-sectional view of the coil bobbin of FIG. 9; 11 is a schematic partial cross-sectional view of the coil bobbin of FIG. 10; FIG.

10 coil bobbin, 11 winding part, 12 first end ring, 13 second end ring, 14 connecting part, 141 second concave groove, 15 pin pin mounting part, 151 pin pin mounting hole, 16 outer waterproof rib, 161 vertical Surface 162 Second arcuate surface 17 Intermediate waterproof rib 171 Semicircular surface 172 First arcuate surface 173 First inclined surface 174 Plane 175 Second inclined surface 18 Ridge 181 First groove, 20 electromagnetic pole plate, 30 pin, 40 housing.

Hereinafter, the technical aspects of the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application. is clearly not an embodiment of All other embodiments obtained by persons skilled in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

It should be noted that when an assembly is said to be "attached" to another assembly, it may be attached directly to the other assembly or there may be intervening assemblies. Where one assembly is considered to be "provided" in another assembly, it may be provided directly in the other assembly, or intervening assemblies may coexist. Where one assembly is considered to be "fixed to" another assembly, it may be fixed directly to the other assembly, or intervening assemblies may coexist.

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, unless defined otherwise. As used herein, the terminology used in the specification of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

Embodiment 1
1 to 3, the coil bobbin 10 of this embodiment includes a winding portion 11, a first end ring 12, a second end ring 13, a connection portion 14 and a pin mounting portion 15, and a first The end ring 12 and the second end ring 13 are provided at both ends of the winding portion 11, the connection portion 14 is provided at the outer edge of the first end ring 12, and the pin mounting portion 15 is provided at the first end of the connection portion 14. provided on one side away from the ring 12, where the connecting portion 14 is provided with a waterproof structure, the waterproof structure being located between two outer waterproof ribs 16 and the two outer waterproof ribs 16; Including intermediate waterproof ribs 17, outer waterproof ribs 16 have tips to facilitate fusing with the injection molding material. Here, the arrows in FIG. 2 mean the flow directions in which water permeates.

When the coil bobbin of this embodiment is applied, the outer waterproof rib 16 has a tip, and the tip can be easily melted into the injection molding material during injection molding, so that the waterproof rib and the injection molding material can be effectively and integrally melted. After molding, the coil bobbin 10 and the injection molding material are well bonded, effectively preventing moisture from permeating the pin mounting portion 15 along the end surface of the first end ring 12, and improving the insulation performance of the coil. Improve and meet product insulation performance requirements.

In this embodiment, the surface of the intermediate waterproof rib 17 is curved, and the curved surface can lengthen the permeation distance. It prevents permeation and further improves the insulation performance of the coil. In this embodiment, the curved surface is a semi-circular surface 171, which is convenient to process and reduces manufacturing costs.

In this embodiment, the surface of the outer waterproof rib 16 includes a vertical surface 161 and a second arcuate surface 162 connected to each other, the vertical surface 161 being perpendicular to the end surface of the first end ring 12 . A tip is formed at the junction of the vertical surface 161 and the second arcuate surface 162 . The second arcuate surface 162 bulges inward and curves. In alternative embodiments, the second arcuate surface 162 is curved outwardly, or the cross-sectional shape of the outer waterproof rib 16 is an inverted V shape.

In this embodiment, the connecting part 14 is further provided with a second groove 141, the second groove 141 is located between the first end ring 12 and the waterproof structure, and forms a second groove. The groove 141 can increase the penetration distance. Specifically, the cross-sectional shape of the second groove 141 is V-shaped. The second groove 141 includes an inclined groove wall and a vertical groove wall, the inclined groove wall being inclined with respect to the end surface of the first end ring 12, and the vertical groove wall being connected to the vertical surface 161. .

In this embodiment, the two outer waterproof ribs 16 are provided symmetrically with respect to the centerline of the surface of the intermediate waterproof rib 17 .

Embodiment 2
6 to 8 show the structure of the coil bobbin 10 of Embodiment 2 of the present application, and the difference between the coil bobbin of Embodiment 2 and Embodiment 1 is that the waterproof structure is different. In the second embodiment, the curved surface includes two first arcuate surfaces 172 that are connected to each other and bulge inward to curve, and a tip is formed at the connection point of the two first arcuate surfaces 172 . In this case, the intermediate waterproof rib 17 also has a tip, and the tip is easily melted into the injection molding material during injection molding, further improving the waterproof performance and the insulation performance of the coil. Here, the arrows in FIG. 7 mean the flow directions in which water permeates.

In this embodiment, the first arcuate surface 172 is a quarter circular surface, where the three intermediate waterproofing ribs 17 are connected in turn and form an undulating shape.

In this embodiment, the waterproof structure further includes a ridge 18, the outer waterproof ribs 16 and the intermediate waterproof ribs 17 are both provided on the ridge 18, and the two sides of the ridge 18 are designed to increase the penetration distance. A first recessed groove 181 is provided to prevent moisture from penetrating the pin mounting hole 151 in the pin mounting portion 15 along the end surface of the first end ring 12, Improve insulation performance. Specifically, the cross-sectional shape of the first groove 181 is semicircular. As an alternative embodiment, the cross-sectional shape of the first groove 181 is V-shaped.

In this embodiment, the vertical groove wall of the second groove 141 and the vertical surface 161 are located in one plane.

In this embodiment, three intermediate waterproof ribs 17 of the waterproof structure are provided. Of course, the number of intermediate waterproof ribs 17 is not limited to this.

As an alternative embodiment, the outer waterproof ribs 16 and the intermediate waterproof ribs 17 may be provided directly on the connecting portion 14 without providing the ridges 18. In this case, the vertical groove walls of the second grooves 141 and The vertical plane 161 is connected.

Embodiment 3
9 to 11 show the structure of the coil bobbin 10 of Embodiment 3 of the present application, and the difference between the coil bobbin of Embodiment 3 and Embodiment 1 is that the waterproof structure is different. In Embodiment 3, the curved surface includes a first slanted surface 173, a plane 174 and a second slanted surface 175, which are connected in order, and the first slanted surface 173 and the second slanted surface 175 are both connected to the first The plane 174 is parallel to the end face of the end ring 12, that is, the shape of the cross section of the intermediate waterproof rib 17 is trapezoidal. Here, the arrows in FIG. 10 mean the flow directions in which water permeates.

In this embodiment, the first inclined surface 173 and the flat surface 174 form an obtuse included angle, and the second inclined surface 175 and the flat surface 174 form an obtuse included angle, which facilitates the processing of the intermediate waterproof ribs, Reduces processing difficulty.

In this embodiment, the cross-sectional shape of the outer waterproof rib 16 is an inverted V shape. The surface of the outer waterproof rib 16 includes a third inclined surface and a fourth inclined surface provided inclined with respect to the end surface of the first end ring, and the fourth inclined surface and the first inclined surface 173 is connected to The third inclined surface and the end surface form an acute included angle.

In this embodiment, the vertical groove wall of the second groove 141 and the third inclined surface are connected by one plane.

The present application further provides a coil comprising the coil bobbin described above. The coils in FIGS. 4 and 5 use the coil bobbin in the first embodiment. The coil further includes an electromagnetic pole plate 20, a pin 30, an enameled wire and a housing 40. When manufacturing the coil, the enameled wire is wound around the coil bobbin 10, and the pin 30 is inserted into the pin mounting hole 151 in the pin mounting portion 15. After that, the two terminals of the enameled wire and the pin 30 are welded, the two coil bobbins 10 are connected by the two electromagnetic pole plates 20, the housing is put on the coil bobbins, and finally the packaging is injection molding.

Each technical feature of the above embodiments can be combined arbitrarily, and for the sake of simplicity of description, not all possible combinations of each technical feature of the above embodiments are described, but these technical features Any combination should be considered within the ranges described herein unless there is a conflict.

The above embodiments are merely for the purpose of describing the present application, and are not used to limit the present application. Those skilled in the art should recognize that any suitable modifications and changes made thereto will fall within the scope of protection sought in this application.

Claims (10)

a winding portion;
a first end ring and a second end ring provided at both ends of the winding portion;
a connecting portion provided on the outer edge of the first end ring;
a pin mounting portion provided on one side of the connecting portion remote from the first end ring;
including
Here, the connecting portion is provided with a waterproof structure, the waterproof structure includes two outer waterproof ribs and at least one intermediate waterproof rib positioned between the two outer waterproof ribs, The waterproof rib has a tip to facilitate fusing with the injection molding material, the coil bobbin. 2. The coil bobbin according to claim 1, wherein the intermediate waterproof rib has a curved surface for increasing the permeation distance. the curved surface is a semi-circular surface;
Alternatively, the coil bobbin according to claim 2, wherein the curved surface includes two first arcuate surfaces connected to each other and curved inwardly. The curved surface includes a first slanted surface, a flat surface and a second slanted surface that are connected in order, and the first slanted surface and the second slanted surface are both connected to the end surface of the first end ring. 3. A coil bobbin according to claim 2, wherein said plane is parallel to said end face. 5. The coil bobbin according to claim 4, wherein said first inclined surface and said plane form an obtuse included angle, and said second inclined surface and said plane form an obtuse included angle. The surface of the outer waterproof rib includes a vertical surface and a second arcuate surface connected to each other, the vertical surface being perpendicular to the end surface of the first end ring, or the cross section of the outer waterproof rib. 2. The coil bobbin according to claim 1, wherein the shape of the is an inverted V shape. The waterproof structure further includes a ridge, the outer waterproof rib and the intermediate waterproof rib are both provided on the ridge, and at least one side surface of the ridge is provided with a first ridge for increasing the permeation distance. 2. The coil bobbin according to claim 1, wherein a groove is provided. 8. The coil bobbin according to claim 7, wherein the cross-sectional shape of said first groove is semicircular. The connection part is further provided with a second groove, and the second groove is located between the first end ring and the waterproof structure, and/or the two 2. The coil bobbin according to claim 1, wherein outer waterproof ribs are provided symmetrically with respect to the centerline of the surface of said intermediate waterproof rib. A coil comprising a coil bobbin according to any one of claims 1-9.

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