CN214899076U

CN214899076U - Injection molding structure with metal through insert and electric connector

Info

Publication number: CN214899076U
Application number: CN202121450077.0U
Authority: CN
Inventors: 梁涛
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-06-29
Filing date: 2021-06-29
Publication date: 2021-11-26
Anticipated expiration: 2031-06-29

Abstract

The utility model discloses an injection molding structure with a metal through insert and an electric connector, which comprises an injection molding piece and a metal insert extending into the injection molding piece, wherein a sealing structure is arranged between the part of the metal insert extending into the injection molding piece and the injection molding piece, and the sealing structure comprises one or two series combinations of a heat shrink tube and a rubber coating layer; the heat-shrinkable tube is a heat-shrinkable tube with glue or is internally provided with a sealing ring; the rubber coating layer is one of a rubber coating layer or a hot melt adhesive layer. Compared with the prior art, the utility model discloses can promote the sealed effect between injection molding and the metal insert to solve the sealed problem of high low temperature round trip switch. The utility model discloses simple structure, sealed position size is less to provide multiple embodiment mode, can select as required in practical application, also can make up and implement, complicated sealed problem is solved in the cooperation.

Description

Injection molding structure with metal through insert and electric connector

Technical Field

The utility model relates to a take injection structure and electric connector that metal link up inserts belongs to metal, working of plastics technical field that moulds plastics.

Background

At present, a metal encapsulation process is common in the injection molding industry, metal parts (such as copper parts, iron parts, aluminum parts, steel parts and the like) can ensure multiple functions of circuit connection, heat conduction and the like at two ends of metal, the encapsulation outside the metal can select different types of high polymer materials according to different requirements (such as ageing resistance, self-lubrication, toughness and the like), and a plurality of parts are required to be sealed. In the last two decades, with the rapid development of new energy automobiles, the sealing requirement is continuously improved, the temperature of the use environment is improved from-40 ℃ to + 85 ℃ to-40 ℃ to + 125 ℃, and because the plastic part and the metal insert are made of different materials, the thermal expansion coefficients of the plastic part and the metal insert are different, so that how to ensure that the sealing performance of the plastic part and the metal insert is maintained along with the continuous change of the environmental temperature becomes an industrial problem.

The parts produced by the common injection molding process can not meet the sealing requirement at all. Copper bar connector of connecting motor and automatically controlled two parts if use on the car, service environment is comparatively abominable, the most common sealed problem that can appear, long-time after using because metal insert is different with plastic body's coefficient of thermal expansion, and cause to form the clearance between metal insert and plastic body's the interface, in the working process, motor confined space and automatically controlled confined space are because temperature variation produces the atmospheric pressure difference, motor end medium is like steam, oil gas etc. can see through the clearance and get into automatically controlled end, corrode, damage electrical apparatus circuit, cause electrical short circuit even.

In order to solve the sealing problem, two common methods are currently used, one is to make an embedded metal insert into a special-shaped bent shape, and the effect of improving the sealing is achieved by prolonging an embedded interface between the insert and the plastic, but the mode still has an interface gap formed by two materials due to different coefficients of thermal expansion, and the sealing problem still exists for a long time; the other is to add one or even a plurality of sealing rings around the insert, the sealing stability of the sealing effect is poor, the sealing problem cannot be fundamentally solved along with the change of injection molding parameters (such as injection molding pressure, cooling time and the like) in the mass production process, the quality is easy to lose control, and the manufacturing cost is high.

Patent No. 2004100243584 proposes a sealing method between a metal through insert and plastic on an injection molding part, but the proposal only solves the problem of the gap between the injection molding part and the metal insert under the condition of high temperature to normal temperature, but does not solve the sealing problem of switching between high temperature and low temperature, and the more severe is that the service temperature range of the product is expanded, the temperature is increased from-40 ℃ to 85 ℃ to the condition of-40 ℃ to + 125 ℃, and the use temperature is required to reach the condition of more than 150 ℃ in some even more severe working environments.

SUMMERY OF THE UTILITY MODEL

For solving the defects of the prior art, an object of the utility model is to provide a take metal to link up injection structure and electric connector of inserts has solved among the prior art

In order to achieve the above object, the utility model adopts the following technical scheme:

an injection molding structure with a metal through insert comprises an injection molding part and the metal insert extending into the injection molding part, wherein a sealing structure is arranged between the part of the metal insert extending into the injection molding part and the injection molding part, and the sealing structure comprises one or two of a heat shrinkage pipe and a rubber coating layer which are connected in series;

the heat-shrinkable tube is a heat-shrinkable tube with glue or is internally provided with a sealing ring;

the rubber coating layer is one of a rubber coating layer or a hot melt adhesive layer.

Preferably, in the injection molding structure with the metal through insert, the surface of the metal insert is further provided with a knurling layer.

Preferably, in the injection molding structure with the metal through insert, the seal ring is an O-ring seal.

Preferably, when the sealing structure is a rubber-coated layer, the joint of the rubber-coated layer of the metal insert is further provided with a through hole, and the rubber-coated layer extends to the inside of the through hole.

An electrical connector comprising an injection molded structure with a metal through insert as described in any of the preceding.

The utility model discloses the beneficial effect who reaches:

compared with the prior art, the utility model discloses can promote the sealed effect between injection molding and the metal insert to solve the sealed problem of high low temperature round trip switch.

The utility model discloses simple structure, sealed position size is less to provide multiple embodiment mode, can select as required in practical application, also can make up and implement, complicated sealed problem is solved in the cooperation.

Drawings

FIG. 1 is an isometric view of the overall structure of the present invention;

FIG. 2 is a view of the metal insert structure of the present invention;

FIG. 3 is a cross-sectional view of an embodiment of the present invention;

FIG. 4 is a cross-sectional view of a second embodiment of the present invention;

fig. 5 is a three-sectional view of the embodiment of the present invention;

fig. 6 is a four-sectional view of an embodiment of the present invention;

fig. 7 is a five-sectional view of an embodiment of the present invention;

the meaning of the reference symbols in the figures: 1-injection molding; 2-a metal insert; 3-heat shrink tube; 4-sealing ring; 5-heat shrink tube with glue; 6-rubber coating layer; 7-hot melt adhesive layer; 8-knurling layer; 21-through hole.

Detailed Description

The present invention will be further described with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

As shown in fig. 1 to 3: the embodiment discloses an injection molding structure with a metal through insert, which comprises an injection molding part 1 and a metal insert 2 extending into the injection molding part 1, wherein at least one part of the metal insert 2 is inserted into the injection molding part 1, and a sealing structure is arranged between the part of the metal insert 2 extending into the injection molding part 1 and the injection molding part 1. The sealing structure comprises one or two of a heat shrinkable tube and an encapsulating layer which are connected in series.

The first embodiment is as follows:

on the basis, the sealing structure of the present embodiment is sealed by using the heat shrinkable tube 3 and the sealing ring 4 disposed inside the heat shrinkable tube 3, wherein the sealing ring 4 may be an O-ring.

The embodiment is particularly suitable for fixing the sealing ring 4 at a position needing to be sealed on the outer surface of the metal insert 2 at the maximum temperature of 140-150 ℃ when the temperature difference is large (usually-40-125 ℃), and even the maximum temperature reaches 140-150 ℃, and then performing high-temperature-resistant heat shrinkage-3 tubes for heat shrinkage and then performing injection molding, thereby achieving the sealing effect. Such benefit is the position of guaranteeing sealing washer 4, can not make sealing washer 4 position slip and warp because of the pressure of moulding plastics, and after the completion of moulding plastics, because sealing washer 4 and metal insert 2 have macromolecular material to pile up, can not laminate improperly, influence sealed effect.

Example two:

referring to fig. 4: the sealing structure of the embodiment adopts a mode that the heat shrinkable tube 5 with glue is wrapped on the outer surface of the metal insert 2. This embodiment matter uses under the not big service environment of difference in temperature, and when practical application, can be according to the difference of temperature resistant kind, the required sealing position of metal insert 2 chooses for use the gluey pyrocondensation pipe of different kinds, not unidimensional. During injection molding, thermal shrinkage is performed firstly, and then injection molding is performed, so that a sealing effect is achieved.

Example three:

referring to fig. 5: the seal structure of this embodiment adopts rubber bag glue film 6, when adopting this kind of seal structure, in order to promote the adhesive force between rubber bag glue film 6 and the metal insert 2, this embodiment still is equipped with through-hole 21 in metal insert 2's rubber bag glue film 6 junction to rubber bag glue film 6 extends to the inside of through-hole 21. The embodiment is suitable for the special-shaped metal inserts with complex structures, and particularly, the operation of the embodiment can be carried out according to specific requirements if no proper heat-shrinkable tube fittings are arranged or the knurling process is not operable. The environment is not limited to the condition that the temperature difference is large, the temperature is between minus 40 ℃ and plus 125 ℃, even the highest temperature reaches 140 ℃ to 150 ℃, and according to different requirements of oil resistance, moisture resistance and the like, the metal insert 2 is firstly encapsulated with rubber by selecting proper rubber and then is subjected to secondary injection molding, thereby achieving the sealing effect.

Example four:

referring to fig. 6: the sealing structure of the embodiment adopts the hot melt adhesive layer 7, wherein the hot melt adhesive layer 7 can be realized by hot melt adhesive, gluing or gumming. The embodiment is more suitable for the special-shaped metal inserts with particularly complex structures, and for the special-shaped metal inserts, the heat-shrinkable tube is not easy to sleeve, and the rubber encapsulation and knurling process cannot be realized. During injection molding, the metal insert 2 is firstly covered with hot melt adhesive by a hot melt adhesive gun, treated in a gluing or gumming manner, and then subjected to injection molding, so that a sealing effect is achieved.

Example five:

referring to fig. 7, the sealing structure of the present embodiment is sealed by providing a knurled layer 8 on the surface of the metal insert 2. In this embodiment: the requirement on air tightness is not high, for example, several kilopascals/several hundred pascals and the temperature difference is not big under the service environment (for example, normal temperature), knurling processing (suggesting grid stripes) is carried out on the metal insert injection molding position, the plastic and the metal surface are effectively attached in the injection molding process, and the metal and the high polymer material are staggered, tightened and attached by utilizing the longitudinal and transverse expansion difference, so that the sealing effect is achieved.

It should be noted that: the five embodiments can have cross applicability, and can also solve the problem of complex sealing by matching a plurality of methods. Above-mentioned five kinds of schemes are the experience accumulation of numerous projects, seek an wholeness solution, have the guide ability of generally solving sealed problem, and sealed scheme have the extensibility, for example PCB circuit board components and parts's sealed protection, can use suitable take gluey pyrocondensation pipe to carry out the pyrocondensation to PCB circuit board, can effectively be waterproof grease proofing after sealed. In addition, if needed, the PCB after the heat shrinkage of the adhesive heat shrinkage pipe can be subjected to secondary injection molding, the scheme can also avoid the pressure and temperature impact of the secondary injection molding on components of the circuit board, ensure the working effectiveness of the circuit board, particularly have good protection on an integrated circuit chip, and avoid about 20% of defects in actual production and hidden troubles in subsequent use. Compared with PCB low-pressure injection molding/PCB glue pouring sealing, the method has the advantages that the cost is greatly reduced, meanwhile, the product quality can be improved, for example, the safety of the brake electronic power-assisted system part is improved, the brake system is prevented from stopping the vehicle, and the method can be widely popularized.

The utility model discloses still disclose an electric connector, contain aforementioned arbitrary one embodiment the injection structure of insert is link up to band metal.

The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. An injection molding structure with a metal through insert comprises an injection molding part (1) and a metal insert (2) extending into the injection molding part (1), and is characterized in that a sealing structure is arranged between the part of the metal insert (2) extending into the injection molding part (1) and the injection molding part (1), and the sealing structure comprises one or two of a heat shrink tube and a rubber coating layer (6) which are connected in series;

the heat-shrinkable tube is a heat-shrinkable tube with glue or a sealing ring is arranged in the heat-shrinkable tube;

2. An injection-molded structure with a metal through-insert according to claim 1, characterized in that the surface of said metal insert (2) is further provided with a knurled layer (8).

3. The injection molding structure with a metal through insert as claimed in claim 1, wherein said sealing ring is an O-ring.

4. An injection molding structure with a metal through insert as claimed in claim 1, wherein when the sealing structure is a rubber coating layer (6), a through hole (21) is further formed at the joint of the rubber coating layer (6) of the metal insert (2), and the rubber coating layer (6) extends to the inside of the through hole (21).

5. An electrical connector comprising the injection-molded structure with a metal through-insert according to any one of claims 1 to 4.