CN216849610U - Electromagnetic coil - Google Patents

Abstract

The utility model relates to a solenoid valve technical field provides an electromagnetic coil. The electromagnetic coil includes: the coil framework is provided with a groove, and the cross section of the groove is of a triangular structure; the coil is wound on the coil framework; the shell is moulded to the package, and the package is moulded the shell and is included casing and connecting portion, and the casing cladding is in the outside of coil skeleton and coil, and connecting portion set up in the inner wall of casing and stretch into in the slot. The electromagnetic coil is provided with the connecting part which extends into the groove, so that the contact area between the coil framework and the plastic-coated shell is increased, and the integral encapsulation strength is improved; and the risk of the entering of the vapor is reduced, so that the purpose of improving the sealing effect is achieved. The cross section of the groove is of a triangular structure, so that the coil framework is convenient to demould after injection molding; the connecting part is similar in appearance and is also of a triangular structure, and the stable characteristic of the triangular structure is utilized to ensure the connecting effect between the coil framework and the plastic-coated shell.

Description

Electromagnetic coil

Technical Field

The utility model relates to a solenoid valve technical field especially relates to an electromagnetic coil.

Background

The existing electric appliances such as washing machines, water heaters, dish washing machines, refrigeration components and the like need to be provided with electromagnetic valves to control the on-off of a water path, a circuit and a gas path.

Because solenoid can generate heat after the solenoid valve circular telegram, when using for a long time or solenoid valve circular telegram for a long time, solenoid generates heat and leads to the multiple material of solenoid to combine not inseparably enough, and steam can get into solenoid inside damage insulating layer along the gap that the material combines and lead to the solenoid current increase, generates heat more seriously even short circuit, fuses the copper line.

SUMMERY OF THE UTILITY MODEL

The utility model provides an electromagnetic coil improves sealed effect and seals intensity to improve electromagnetic coil's performance.

According to a first aspect of the present invention, there is provided a solenoid coil comprising:

the coil framework is provided with a groove, and the cross section of the groove is of a triangular structure;

the coil is wound on the coil framework;

the shell is moulded to the package, the package is moulded the shell and is included casing and connecting portion, the casing cladding in coil skeleton with the outside of coil, connecting portion set up in the inner wall of casing stretches into in the slot.

In an embodiment of the present invention, the groove includes a first side wall and a second side wall connected to each other, the first side wall is disposed to be inclined with respect to an axis of the bobbin, the second side wall is disposed to be inclined with respect to the axis of the bobbin, and the first side wall and the second side wall are disposed to be inclined toward a direction close to each other.

In an embodiment of the present invention, the number of the grooves is plural, and plural grooves are coaxially disposed and sleeved with each other relative to the axial direction of the coil bobbin.

In an embodiment of the present invention, the coil bobbin is provided with an exhaust groove, the coil bobbin is provided with a central hole along an axial direction thereof, one end of the exhaust groove communicates with the groove, and the other end communicates with the central hole.

In an embodiment of the present invention, the number of the exhaust grooves is plural, and the exhaust grooves are annularly disposed around the central hole.

In an embodiment of the present invention, the coil bobbin includes:

a winding portion for winding the coil;

the end plate, set up in the tip of wire winding portion, the end plate is kept away from one side of wire winding portion is provided with the slot.

In an embodiment of the present invention, the number of the end plates is two, two end plates are respectively disposed at both ends of the winding portion along the axial direction thereof, and at least one of the end plates is disposed with the groove.

In an embodiment of the present invention, an annular boss is disposed on one side of the end plate away from the winding portion.

In an embodiment of the present invention, the plastic-coated housing is made of BMC material.

The utility model discloses an in one embodiment, still include inserted sheet and lead wire, the contact pin set up in on the coil skeleton, the contact pin connect respectively in the coil with the lead wire.

The utility model discloses solenoid. The coil is around locating coil skeleton, and coil skeleton realizes accomodating of coil when playing the whole supporting role of support.

Through setting up the casing cladding in the outside of coil skeleton and coil, realize the encapsulation to coil skeleton and coil, reduce solenoid and damage the risk of coil in the in-service use process. Meanwhile, the plastic-coated shell can prevent water vapor from entering the coil and damaging a paint film of the coil, and the service life of the electromagnetic coil is prolonged.

Set up in the inner wall of casing through setting up connecting portion, the inner wall of casing provides fixed position for connecting portion, stretches into the slot through setting up connecting portion in, is equivalent to in connecting portion embedding slot and fill the slot. The plastic coating is carried out by adopting the mode, and the aim is to increase the contact area between the coil framework and the plastic coating shell, so that the coil framework and the plastic coating shell are combined more tightly, and the integral coating strength is improved; second, connecting portion play the effect that blocks water and cut off, increase the inside route of steam entering coil to reduce the risk of the entering of steam, in order to reach the purpose that improves sealed effect.

The cross section of the groove is of a triangular structure, so that firstly, the contact area between the groove and an injection mold is smaller, and the coil framework is convenient to demould after injection molding; and secondly, in the plastic coating process, because the connecting part extends into the groove, the shape of the connecting part is matched with that of the groove, the shape of the connecting part is similar to that of the groove and is also of a triangular structure, and the stable structure characteristic of the triangle is utilized to ensure the connection effect between the coil framework and the plastic coating shell.

Drawings

For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, the relevant elements or components may be arranged differently as is known in the art. Further, in the drawings, like reference characters designate the same or similar parts throughout the several views. Wherein:

FIG. 1 is a schematic diagram illustrating a perspective structure of an electromagnetic coil according to an exemplary embodiment;

FIG. 2 is a schematic diagram illustrating another view of a solenoid coil according to an exemplary embodiment;

FIG. 3 is a cross-sectional view of an electromagnetic coil shown in accordance with an exemplary embodiment.

The reference numerals are explained below:

100. a coil bobbin;

1. a winding part; 11. a central bore;

2. an end plate; 21. a trench; 211. a first side wall; 212. a second side wall; 22. an exhaust groove; 23. and an annular boss.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, so it should be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.

In the description of the present disclosure, unless otherwise explicitly specified or limited, the terms "first", "second", and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, reference to "the" object or "an" object is also intended to mean one of many such objects possible.

The terms "connected," "secured," and the like are to be construed broadly and unless otherwise stated or indicated, and for example, "connected" may be a fixed connection, a removable connection, an integral connection, an electrical connection, or a signal connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present disclosure can be understood by those skilled in the art as the case may be.

Further, in the description of the present disclosure, it is to be understood that the directional words "upper", "lower", "inner", "outer", etc., which are described in the exemplary embodiments of the present disclosure, are described at the angles shown in the drawings, and should not be construed as limiting the exemplary embodiments of the present disclosure. It will also be understood that, in this context, when an element or feature is referred to as being "on", "under", or "inner", "outer" with respect to another element(s), it can be directly on "," under ", or" inner "," outer "with respect to the other element(s), or indirectly on", "under", or "inner", "outer" with respect to the other element(s) via intervening elements.

In the present embodiment, as shown in fig. 1, the electromagnetic coil includes a coil bobbin 100 and a coil (not shown), where the coil is specifically an enameled wire, the coil is wound around the coil bobbin 100, and the coil bobbin 100 plays a role of supporting the whole body, and at the same time, the coil is accommodated.

Because a large amount of heat can be emitted in the practical use process of the electromagnetic coil, the combination of various materials of the electromagnetic coil is not tight enough, water vapor can enter the inside of the electromagnetic coil along the gaps formed by the combination of the materials to damage an insulating layer, so that the current of the electromagnetic coil is increased, and the heating is more serious and even the short circuit is caused.

In order to solve this problem, the electromagnetic coil provided in this embodiment further includes a plastic-coated casing (not shown in the figure), and the plastic-coated casing includes a shell body, and the shell body is wrapped outside the bobbin 100 and the coil. Through setting up the outside of casing cladding in coil skeleton 100 and coil, realize the encapsulation to coil skeleton 100 and coil, reduce solenoid and damage the risk of coil in the in-service use process. Meanwhile, the plastic-coated shell can prevent water vapor from entering the coil and damaging a paint film of the coil, and the service life of the electromagnetic coil is prolonged.

Wherein, the plastic-coated shell is made of BMC material.

In one aspect of this embodiment, as shown in fig. 1-2, the plastic-coated casing further comprises a connecting portion, the bobbin 100 is provided with a groove 21, and the connecting portion is disposed on the inner wall of the casing and extends into the groove 21. Set up in the inner wall of casing through setting up connecting portion, the inner wall of casing provides fixed position for connecting portion, stretches into slot 21 through setting up connecting portion in, is equivalent to connecting portion embedding slot 21 in and fill slot 21. The plastic coating is carried out in the mode, and the purpose is that firstly, the contact area between the coil framework 100 and the plastic coating shell is increased, so that the coil framework 100 and the plastic coating shell are combined more tightly, and the integral encapsulation strength is improved; and secondly, the connecting part plays a role in blocking water and separating, and the distance of water vapor entering the coil is increased, so that the risk of water vapor entering is reduced, and the purpose of improving the sealing effect is achieved.

In one aspect of this embodiment, the cross-section of the grooves 21 is triangular in configuration, as shown in FIG. 3. By arranging the groove 21 with a triangular cross section, the aim is that firstly, because the contact area of the groove 21 and the injection molding material is smaller, the coil framework 100 is convenient to demould after injection molding; secondly, in the plastic-coated process, because the connecting part extends into the groove 21, the shape of the connecting part is matched with that of the groove 21, the shape of the connecting part is similar to that of a triangular structure, and the stable characteristic of the triangular structure is utilized to ensure the connecting effect between the coil framework 100 and the plastic-coated shell.

Specifically, the groove 21 includes a first sidewall 211 and a second sidewall 212 connected to each other, the first sidewall 211 being disposed obliquely with respect to the axis of the bobbin 100, the second sidewall 212 being disposed obliquely with respect to the axis of the bobbin 100, the first sidewall 211 and the second sidewall 212 being disposed obliquely toward each other. When the plastic coating is performed, the first side wall 211 and the second side wall 212 are both arranged obliquely relative to the axis of the coil skeleton 100, the plastic coating material in a hot-melt state can flow down along the first side wall 211 and the second side wall 212, and the first side wall 211 and the second side wall 212 play a role in drainage. The first sidewall 211 and the second sidewall 212 are disposed in an inclined manner toward each other, in other words, the connection between the first sidewall 211 and the second sidewall 212 is the vertex of a triangular structure, and the first sidewall 211 and the second sidewall 212 play a role in converging the plastic coated material.

In one aspect of the present embodiment, the number of the grooves 21 is plural, and the plural grooves 21 are coaxially arranged with respect to the axial direction of the bobbin 100 and are nested with each other. Through the coaxial setting of a plurality of grooves 21 for coil skeleton 100's axial and establish each other cover, make coil skeleton 100 and connecting portion have intercrossing combination's effect, lead to external steam to get into inside route from the solenoid outside and become crooked, increased external steam and got into the inside total route of coil in other words to sealing performance is improved.

During encapsulation, a closed cavity is formed inside the mold after the mold is matched with the coil framework 100, after a molten encapsulation material enters the mold cavity from an injection molding opening, gas inside the mold cavity is forcedly compressed due to lack of a discharge way, a large amount of heat is released, the temperature in the mold cavity is rapidly increased, the outer edge of the coil framework 100 is thin and is easy to be burnt, and the encapsulation material cannot be fully fused with the edge of the coil framework 100.

To solve this problem, as shown in fig. 3, the bobbin 100 is provided with an exhaust groove 22, the bobbin 100 is provided with a center hole 11 along an axial direction thereof, and one end of the exhaust groove 22 communicates with the groove 21 and the other end communicates with the center hole 11.

Through arranging the exhaust groove 22, one end of the exhaust groove is communicated with the groove 21, the other end of the exhaust groove is communicated with the central hole 11, the exhaust groove 22 realizes the middle communication between the groove 21 and the central hole 11, and the mold cavity is communicated with the outside through the exhaust groove 22.

When in injection molding, the encapsulating material is injected from an injection molding opening of the injection mold, gas in the mold cavity is extruded by the melted encapsulating material and can be discharged to the central hole 11 through the exhaust groove 22, after the encapsulating material fills the whole mold cavity, because the air in the mold cavity can be timely discharged through the exhaust groove 22, the temperature in the mold cavity is stable and cannot be rapidly raised, and the encapsulating material can form a compact sealing layer after being fully fused with the coil framework 100 to prevent external moisture from permeating, so that the insulation property and the reliability of the electromagnetic coil are ensured.

It should be noted that, besides the exhaust slot 22, the exhaust slot 22 may also be used as a positioning slot, and when winding, the winding machine is provided with a fixing table matching with the positioning slot to achieve the positioning function. When the injection mold is sealed in the processing, a boss can be set on the mold, and when the coil framework 100 is sealed and injected, the boss on the injection mold is matched with the exhaust groove 22 to play a positioning role, so that the position of the framework coil can not deviate during injection molding, the uniform thickness of the plastic-coated shell is further ensured, and the problems of poor insulation, even coil exposure and the like caused by the nonuniform sealing thickness are avoided.

It will be appreciated that the vent grooves 22 are not filled with encapsulating material when the encapsulating material is injected, due to the locating engagement of the projections on the injection mould with the vent grooves 22.

In one aspect of the present embodiment, the number of the exhaust grooves 22 is plural, and the plural exhaust grooves 22 are provided around the center hole 11. In other words, the exhaust grooves 22 are radially arranged relative to the central hole 11, so that gas at any position of the mold cavity can be exhausted through the exhaust grooves 22, the timeliness and effectiveness of gas exhaust are ensured, the fusion degree between the encapsulating material and the coil skeleton 100 is enhanced, and the coating and sealing effects of the plastic-coated shell on the coil skeleton 100 are improved.

In one aspect of the present embodiment, as shown in fig. 3, the bobbin 100 includes a winding portion 1 and an end plate 2, the winding portion 1 is a type cylindrical structure, the winding portion 1 is used for winding a coil, and the winding portion 1 functions as a bobbin to receive the coil. The end plate 2 is arranged at the end part of the winding part 1, the end plate 2 plays a role in limiting the coil, one side, far away from the winding part 1, of the end plate 2 is an end face of a smooth structure, and the groove 21 is formed in the end face.

Wherein, the quantity of end plate 2 is two, and winding portion 1 is provided with two end plates 2 respectively along its axial direction's both ends, and two end plates 2 realize spacing to two sides of coil, guarantee the structural stability of coil. At least one of the two end plates 2 is provided with a groove 21. In this embodiment, the arrangement position of the groove 21 is not limited, and the groove 21 may be arranged in one of the two end plates 2, or the two end plates 2 may be provided with two grooves 21 in a one-to-one correspondence manner, which may be adjusted according to actual situations.

The center hole 11 of the bobbin 100 substantially penetrates the entire winding portion 1 and both end surfaces.

In one aspect of the present embodiment, the end plate 2 is provided with an annular boss 23 on a side thereof remote from the winding portion 1. The annular boss 23 is arranged on one side, far away from the winding part 1, of the end plate 2, and when the annular boss 23 is matched with a die, the thickness of the plastic-coated shell is determined by the thickness of the annular boss 23 along the axial direction of the coil framework 100.

In one aspect of this embodiment, the solenoid further includes pins (not shown) and leads (not shown), the pins being disposed on the bobbin 100, the pins being connected to the coil and the leads, respectively. Specifically, be provided with lead wire groove and contact pin groove respectively on end plate 2, the contact pin groove is used for fixed inserted sheet, and the contact pin adopts metal to make, and after the coil twined on winding portion 1, the free end of coil is drawn forth and is carried out fixed connection with the contact pin through the lead wire groove, and contact pin and lead wire electricity are connected at last, realize the transport of electric current.

It should be noted that, for other structures of the electromagnetic coil in the present embodiment, reference may be made to the structure of the electromagnetic coil in the above-mentioned embodiment, which is not described herein again.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and example embodiments be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (10)

1. An electromagnetic coil, comprising:

the coil bobbin (100), the coil bobbin (100) is provided with a groove (21);

the coil is wound on the coil framework (100);

the plastic-coated shell comprises a shell body and a connecting portion, the shell body is coated on the coil framework (100) and the outside of the coil, and the connecting portion is arranged on the inner wall of the shell body and extends into the groove (21).

2. The electromagnetic coil as set forth in claim 1, characterized in that the cross-section of the groove (21) is a triangular structure; the groove (21) comprises a first side wall (211) and a second side wall (212) which are connected with each other, the first side wall (211) is obliquely arranged relative to the axis of the coil bobbin (100), the second side wall (212) is obliquely arranged relative to the axis of the coil bobbin (100), and the first side wall (211) and the second side wall (212) are obliquely arranged towards the direction close to each other.

3. The electromagnetic coil according to claim 1, wherein the number of the grooves (21) is plural, and the plural grooves (21) are coaxially arranged with respect to an axial direction of the bobbin (100) and are fitted to each other.

4. The electromagnetic coil according to claim 1, characterized in that the coil bobbin (100) is provided with a vent groove (22), the coil bobbin (100) is provided with a central hole (11) along an axial direction thereof, and one end of the vent groove (22) communicates with the groove (21) and the other end communicates with the central hole (11).

5. The solenoid coil as claimed in claim 4, characterized in that the number of the vent grooves (22) is plural, and a plurality of the vent grooves (22) are provided around the center hole (11).

6. The electromagnetic coil as set forth in claim 1, characterized in that the bobbin (100) includes:

a winding portion (1), the winding portion (1) being for winding the coil;

the end plate (2) is arranged at the end part of the winding part (1), and one side, far away from the winding part (1), of the end plate (2) is provided with the groove (21).

7. The electromagnetic coil as set forth in claim 6, characterized in that the number of the end plates (2) is two, both ends of the winding portion (1) in the axial direction thereof are provided with two of the end plates (2), respectively, and at least one of the two end plates (2) is provided with the groove (21).

8. The electromagnetic coil as set forth in claim 6, characterized in that the side of the end plate (2) remote from the winding portion (1) is provided with an annular boss (23).

9. The electromagnetic coil of claim 1 wherein said overmolded housing is formed of an unsaturated resin material.

10. The electromagnetic coil as set forth in claim 1, further comprising a pin and a lead, said pin being disposed on said bobbin (100), said pin being connected to said coil and said lead, respectively.

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