CN216450467U

CN216450467U - Electromagnetic coil

Info

Publication number: CN216450467U
Application number: CN202122655543.5U
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Current assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Priority date: 2021-11-01
Filing date: 2021-11-01
Publication date: 2022-05-06
Anticipated expiration: 2031-11-01

Abstract

The utility model discloses an electromagnetic coil, which comprises a coil framework, an insert and a coil, wherein a first end surface part and a second end surface part are respectively arranged at two ends of a pipe main body of the coil framework; before encapsulating and forming processes, the coil framework, the inserting sheet and the coil form an integral encapsulated piece, when the encapsulated piece is placed in an inner cavity of a lower die of the die, and a positioning structure of the second end face part is matched with a corresponding structure of the inner cavity of the lower die, so that the circumferential rotation of the encapsulated piece can be limited through the matching of the positioning structure and the corresponding structure of the inner cavity, the mounting and positioning accuracy of the encapsulated piece is improved, the upper die can be rapidly and smoothly covered, the encapsulating and injection molding efficiency and the forming quality are greatly improved, and meanwhile, the risk that the upper die crushes the inserting sheet and damages the upper die when the upper die is covered is also avoided.

Description

Electromagnetic coil

Technical Field

The utility model relates to the technical field of electric control components, in particular to an electromagnetic coil.

Background

With the development of scientific and technological civilization, people increasingly enjoy the convenience brought to life by science and technology, such as washing machines, dish washing machines and the like, the clothes, bowls, chopsticks and the like are required to be purified through water, water resources are one of essential resources for people and are required to be saved for use by people, so that the control of the water consumption is particularly important, the water can not be controlled by a water valve in the washing machines, the dish washing machines and the like, and the core of the water control valve is driven to be an electromagnetic coil.

The current electromagnetic coil structure mainly has two forms, and the main difference of the two forms is that the directions of the inserting sheets are different. The extending direction of the insert in the first electromagnetic coil is vertical to the axial direction of the coil; the extending direction of the inserting pieces in the second type of electromagnetic coil is parallel to the axial direction of the coil.

First kind solenoid when encapsulating injection moulding outside, the mould die cavity is placed to the coil, can fix a position through the coil inserted sheet, and second kind solenoid structure, inserted sheet and coil hole syntropy, when the coil encapsulates the shaping, inserted sheet department seals the glue and needs mould and lower mould side direction slider to push into on the mould and seal the glue, does not have other location between mould and the coil, only adopts plug and coil hole to carry out suitable tight fit and fixes the winding.

How to improve the production efficiency and the production quality of the second electromagnetic coil is a technical problem which is always concerned by technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

The utility model aims to improve the production efficiency and the production quality of the insert and coil coaxial electromagnetic coil.

The utility model provides an electromagnetic coil which comprises a coil framework, an inserting piece and a coil, wherein the coil framework comprises a tube main body, the tube main body is provided with an inner hole, two ends of the tube main body are respectively provided with a first end surface part and a second end surface part, the coil is wound on the tube main body, the inserting piece is close to the first end surface part, the extending direction of the inserting piece is axially parallel to the inner hole, and the second end surface part is provided with a positioning structure for circumferential limiting with an inner cavity of a mold formed by encapsulation.

Before encapsulating and forming processes, the coil framework, the inserting sheet and the coil form an integral encapsulated piece, when the encapsulated piece is placed in an inner cavity of a lower die of the die, and a positioning structure of the second end face part is matched with a corresponding structure of the inner cavity of the lower die, so that the circumferential rotation of the encapsulated piece can be limited through the matching of the positioning structure and the corresponding structure of the inner cavity, the mounting and positioning accuracy of the encapsulated piece is improved, the upper die can be rapidly and smoothly covered, the encapsulating and injection molding efficiency and the forming quality are greatly improved, and meanwhile, the risk that the upper die crushes the inserting sheet and damages the upper die when the upper die is covered is also avoided.

Drawings

FIG. 1 is a schematic diagram of the structure of the component of the solenoid coil to be encapsulated in accordance with one embodiment of the present invention;

FIG. 2 is an enlarged view of the point A in FIG. 1;

FIG. 3 is a schematic diagram of the structure of the solenoid coil in one embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a bobbin according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a bobbin according to another embodiment of the present invention;

FIG. 6 is a schematic view of a component to be encapsulated positioned in an inner cavity of a lower mold in one embodiment of the present invention;

fig. 7 is an enlarged view of B in fig. 6.

Wherein, the one-to-one correspondence between the reference numbers and the part names in fig. 1 to 7 is as follows: 1-a coil skeleton; 10-a tube body; 1 a-an inner bore; 1 b-a tab hole; 11-a first end face portion; 12-a second end face portion; 121-basal plane; 122-waterproof bosses; 1221-a ring section; 1222-a positioning part; 122 a-step surface; 2-a coil; 3-inserting pieces; 4-a positioning structure; 41-a guide section; 5-an encapsulation layer;

6-lower mould; 61-groove.

Detailed Description

The technical problems that the current magnet coil with the insertion piece coaxial with the inner hole of the coil is low in encapsulation injection molding efficiency and low in molding quality are deeply researched, and researches show that when the magnet coil is encapsulated and molded, the adhesive sealing at the insertion piece position needs to be pushed into an upper die and a lower die lateral sliding block of a die to seal the adhesive, and the die and an encapsulated piece are not positioned in other ways, so that the assembly of the coil is difficult. And after the sealing device is arranged in a mold cavity, the sealed part can easily rotate in the circumferential direction. Once the encapsulated piece rotates, the phenomenon that the insert is crushed or the mould is crushed can occur when the upper mould is covered.

In addition, before the encapsulated piece is encapsulated, the insert sheet of the encapsulated piece is bent by more than 90 degrees, the insert sheet is bent for the second time by mold closing and a lateral sliding block of the encapsulating process, and the insert sheet is folded to be 90 degrees. If the insert sheet is installed inaccurately, the quality uniformity of its bending is not good, and after encapsulating the shaping, two insert sheet heights may be inconsistent to the insert sheet probably appears the risk of leaking.

On the basis of the research findings, a technical scheme for solving the technical problems is further explored and proposed.

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

Referring to fig. 1 to 7, fig. 1 is a schematic structural diagram of a component to be encapsulated of an electromagnetic coil according to an embodiment of the present invention; FIG. 2 is an enlarged view of the point A in FIG. 1; FIG. 3 is a schematic diagram of the structure of the solenoid coil in one embodiment of the present invention; FIG. 4 is a schematic structural diagram of a bobbin according to an embodiment of the present invention; FIG. 5 is a schematic structural diagram of a bobbin according to another embodiment of the present invention; FIG. 6 is a schematic view of a component to be encapsulated positioned in an inner cavity of a lower mold in one embodiment of the present invention; fig. 7 is an enlarged view of B in fig. 6.

The utility model provides an electromagnetic coil, which comprises a magnetizer and a coil part, wherein the coil part further comprises a coil framework 1, an inserting piece 3, a coil 2 and an encapsulating layer 5. The bobbin 1 is usually an insulating plastic member, and may be formed by an injection molding process, but the bobbin 1 may also be formed by other processes. The number of the inserting pieces 3 is usually two, and the function of the inserting pieces is to realize the connection of the metal wire wound to form the coil 2 and an external power supply. The insert 3 is typically a metal sheet.

The main structure and function of the magnetizer are referred to the prior art, and are not detailed herein.

The coil bobbin 1 of the present invention includes a tube body 10, the tube body 10 has an inner hole 1a, two ends of the tube body 10 respectively have a first end surface portion 11 and a second end surface portion 12, the coil 2 is wound around the tube body 10, and the tube body 10 may be an insulation injection molding. The inserted sheet 3 is close to first terminal surface portion 11, specifically, the tip that is close to first terminal surface portion can be provided with inserted sheet hole 1b, and the one end cartridge of inserted sheet 3 is in inserted sheet hole 1b, and inserted sheet 3 part extends to bobbin 1's outside. The extending direction of the inserting piece 3 is parallel to the axial direction of the inner hole 1a of the pipe main body 10, and it should be noted that the parallel is substantially parallel here, and the inserting piece 3 is substantially the same direction as the axial direction of the pipe main body 10.

The second end face part 12 of the utility model is provided with a positioning structure 4 for circumferential limiting with an inner cavity of the mold for encapsulation molding. That is, the locating structure 4 on the second end face portion 12 and the corresponding structure of the mold cavity of the encapsulation molding process can cooperate to inhibit circumferential rotation of the two.

The positioning structure 4 may be a protrusion, the shape of which is not limited, and may be a cylinder, or a cylinder with a polygonal cross-section. Fig. 4 and 5 show the positioning structures of different outer contours respectively. The positioning structure 4 may also be a groove, and accordingly, the mold cavity formed by encapsulation is provided with a groove or a protrusion for fitting. Referring to fig. 7, when the positioning structure 4 is a protrusion, the lower mold 6 is provided with a groove 61 therein for fitting with the protrusion.

Before the encapsulation molding process is carried out, the coil framework 1, the inserting pieces 3 and the coil 2 form an integral encapsulated piece, when the encapsulated piece is placed in an inner cavity of a lower die 6 of the die, and the positioning structures 4 of the second end face parts 12 are matched with corresponding structures of the inner cavity of the lower die 6, so that the circumferential rotation of the encapsulated piece can be limited through the matching of the positioning structures 4 and the corresponding structures of the inner cavity, the installation and positioning accuracy of the encapsulated piece is improved, the upper die can be rapidly and smoothly covered, the encapsulation injection molding efficiency and the molding quality are greatly improved, and meanwhile, the risk that the upper die presses the inserting pieces 3 and damages the upper die when the upper die is covered is also avoided.

In a specific embodiment, the second end face 12 includes a base surface 121 and a waterproof boss 122 protruding from the surface of the base surface 121, the waterproof boss 122 extends outward from the outer edge of the inner hole 1a, the base surface 121 is located at the periphery of the waterproof boss 122, and a step surface 122a is formed between the base surface 121 and the waterproof boss 122.

The waterproof boss 122 and the pipe body 10 may be integrally injection-molded.

In general, a groove is formed in an inner cavity of the lower mold 6 in the encapsulation process, the waterproof boss 122 is installed inside the groove, and after encapsulation and injection molding, the encapsulation layer 5 is formed at other positions of the tube main body 10 including the base surface 121 and a step surface 122a between the base surface 121 and the waterproof boss 122 except for an outer end surface of the waterproof boss 122. The waterproof boss 122 can prevent external moisture from entering the inside of the envelope layer 5.

In one embodiment, the locating structure 4 may be located on the waterproof boss 122, which facilitates the sealing of the solenoid coil formed by the enclosure.

Of course, the positioning structure 4 can also be located on the base surface 121.

In order to improve the sealing performance after encapsulation, the stepped surface 122a may be a tapered ring surface, and the radial dimension of the ring surface is smaller as the waterproof boss 122 is closer to the base surface 121 in the height direction.

For the electromagnetic coil with a smaller structure, the molding manufacturability of the positioning structure 4 and the sealing performance of the molded product are both considered, and a specific implementation manner of the waterproof boss 122 is given below.

In one embodiment, the waterproof boss 122 includes a ring portion 1221 and a positioning portion 1222, an outer edge of the ring portion 1221 partially extends toward the base surface 121 to form the positioning portion 1222, and the positioning structure 4 is located on the positioning portion 1222. The size of the positioning portion 1222 can be set according to specific requirements, and is not limited herein.

In the above embodiment, the annular portion 1221 plays a good waterproof effect, and the positioning portion 1222 extending in the radial direction can satisfy the setting of the positioning structure 4, and improve the flexibility of the setting of the positioning structure 4.

The positioning portion 1222 satisfies the requirement of providing the positioning structure 4, and the positioning portion 1222 can also have a better sealing performance after injection molding and encapsulation.

The positioning structure 4 provided on the positioning portion 1222 as described above may be a protrusion having a predetermined height, or may be a groove.

A specific arrangement of the protrusions is also provided.

In one embodiment, the protrusion includes a guiding section 41, and the outer surface of the guiding section 41 is tapered, and the cross-sectional size of the guiding section 41 gradually increases as the guiding section approaches the base surface 121.

Taking the positioning structure 4 as a protrusion as an example, the guiding section 41 may be disposed at the head end of the protrusion, or certainly, may be disposed at the middle section of the protrusion, as long as it can guide the protrusion to be installed in the matching structure of the mold, thereby achieving quick installation.

The positioning structure 4, the tube main body 10 and the waterproof boss 122 in the above embodiments are integrally formed by an injection molding process.

Thus, the positioning structure 4 and the waterproof boss 122 are directly formed when the pipe body 10 is formed, and the method is simple and easy.

The electromagnetic coil provided by the utility model is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. The utility model provides an electromagnetic coil, its characterized in that, includes coil skeleton (1), inserted sheet (3) and coil (2), coil skeleton (1) is including pipe main part (10), pipe main part (10) have hole (1a), pipe main part (10) both ends have first terminal surface portion (11) and second terminal surface portion (12) respectively, the coil is around locating pipe main part (10), first terminal surface portion (11) are including inserted sheet hole (1b), the part cartridge of inserted sheet (3) in inserted sheet hole (1b), inserted sheet (3) extending direction with hole (1a) axial direction is parallel, and second terminal surface portion (12) are provided with location structure (4) for it is spacing with the mould inner chamber circumference of encapsulating shaping.

2. The electromagnetic coil according to claim 1, wherein the second end surface portion (12) includes a base surface (121) and a waterproof projection (122) projecting from a surface of the base surface (121), the waterproof projection (122) extends outward from an outer edge of the inner hole (1a), the base surface (121) is located at a periphery of the waterproof projection (122), and a step surface (122a) is formed between the base surface (121) and the waterproof projection (122).

3. The electromagnetic coil according to claim 2, wherein the step surface (122a) is a tapered annular surface, and a radial dimension of the annular surface decreases closer to the base surface (121) in a height direction of the waterproof boss (122).

4. The electromagnetic coil as set forth in claim 2, characterized in that the positioning structure (4) is located at the waterproof boss (122).

5. The electromagnetic coil according to claim 3, characterized in that the waterproof boss (122) comprises a ring-shaped portion (1221) and a positioning portion (1222), the outer edge of the ring-shaped portion (1221) partially extends toward the base surface (121) to form the positioning portion (1222), and the positioning structure (4) is located at the positioning portion (1222).

6. The magnet coil as claimed in any of claims 2 to 5, characterised in that the detent structures (4) are projections of a predetermined height.

7. The electromagnetic coil according to claim 6, characterized in that the protrusion comprises a guide section (41), the outer surface of the guide section (41) is tapered, and the cross-sectional dimension of the guide section (41) becomes gradually larger as approaching the base surface (121).

8. The magnet coil as claimed in any of claims 1 to 5, characterized in that the detent structures (4) are recesses.

9. The magnet coil as claimed in any of claims 2 to 5, characterised in that the locating structure (4), the tube body (10) and the water-repellent boss (122) are integrally formed by an injection moulding process.

10. The electromagnetic coil according to any of claims 1 to 5, further comprising an encapsulation layer (5), wherein the encapsulation layer (5) is formed on the periphery of the coil (2) by an injection molding process.