JPH0326509B2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention maintains airtight and liquid tightness at the adhesive interface between the conductor surface and the synthetic resin by molding the periphery of a metal conductor with synthetic resin such as epoxy resin. This invention relates to a multicore resin terminal for sealing.

[Prior art and its problems]

Conventionally, this type of sealing resin terminal for the purpose of air-tightness and liquid-tightness has been made by separately casting a conductor for a large current/high voltage circuit and a conductor for a low current signal circuit in thermosetting resin such as epoxy resin. This is well known and its applications include, for example, main control rectifiers mounted on train cars, and it has become an important component in making such rectifiers smaller and lighter.

Figure 1 shows an example in which such a sealing resin terminal is applied to a main control rectifier.
are synthetic resins 41 and 4 respectively constructed separately.
It is embedded in 2. One end of the conductor 1 for the large current/high voltage circuit is connected to one end of the other conductor 1 for the large current/high voltage circuit via the anode and cathode of the thyristor 2, and one end of the conductor 3 for the low current signal circuit is connected to the gate of the thyristor 2. and one end of the other weak current signal circuit conductor 3 via the cathode. The other end of the large current/high voltage circuit conductor 1 is connected to an external main circuit (not shown).
The other end of the conductor for the weak current signal circuit is the pulse transmission circuit 5
It is connected to the.

In recent years, this type of electrical equipment mounted on vehicle towers has been required to be smaller and lighter in order to improve performance and reduce costs.In the case of the main control rectifier, the sealing resin terminal How to miniaturize is considered to be an important condition for achieving the objective. In order to miniaturize the sealing multi-axis terminal, the sealing resin terminals, which were conventionally configured separately, were combined into one, and in addition, multiple high-current, high-voltage circuit conductors and low-current signal conductors embedded in the synthetic resin were combined. It is conceivable to reduce the installation interval with the circuit conductor as much as possible. However, in such a configuration, as the large current, high voltage circuit conductor approaches the weak current, low voltage circuit conductor, electromagnetic induction is induced in the weak current, low voltage circuit conductor through which the control current of the thyristor flows, thereby making it difficult to control the firing phase. There was a problem in that the thyristor used for this purpose malfunctioned.

[Purpose of the invention]

The present invention has been made in view of the shortcomings of the prior art, and is a novel method that can prevent the influence of electromagnetic induction even if the conductor for a large current/high voltage circuit and the conductor for a low current signal circuit are placed close to each other. An object of the present invention is to provide a multicore resin terminal for sealing.

[Key points of the invention]

The gist of the present invention is to install a tubular body made of a conductive material on the outer periphery of a conductor for a weak current signal circuit in an insulated manner with the conductor, and to use the inner and outer conductors as a reciprocating line. [Embodiment of the Invention] Figure 2 shows the first embodiment of the present invention.
A tubular body 6 made of a conductive material is fitted into the outer periphery of the conductor 3 for a weak current signal circuit, and the distance between the conductor 3 and the tubular body 6 is maintained by an insulating spacer 7. After connecting the embedded metal fitting 8 with a lead wire 9, the synthetic resin 43 is molded and hardened so that the embedded metal fitting 8 is exposed.

One end of the weak current signal circuit conductor 3 and the embedded metal fitting 8 that is close to this end are connected to the gate and cathode of the thyristor 2 via twisted wires 10, respectively, and the other end of the weak current signal circuit conductor 3 The embedded metal fitting 8 close to this end is connected to the pulse transmission circuit 5 via a twisted wire 10.

Examples of the conductive material used for the tubular body 6 include metals such as iron and aluminum, alloys such as aluminum alloys and copper alloys, conductive plastics, sheets such as carbon paper, braided wires, and wire mesh conductive materials. A flexible material can be used.

Furthermore, in order for the tubular body 6 made of a conductive material in the configuration of the present invention to have good adhesion to the synthetic resin 4, for example, if the tubular body 6 is made of a thin metal plate,
Of course, it can be used by roughening the inner and outer surfaces of the tubular body 6 by means such as sandblasting, or by penetrating a large number of holes in the thickness direction, and in order to prevent the occurrence of cracks in the molded synthetic resin,
The flexible material is applied to the surface of the tubular body 6, in particular to the surface of the tubular body 6.
It is also effective to attach it to the end of the

The insulating spacer 7 for maintaining the distance between the conductor 3 for the weak current signal circuit and the tubular body 6 is made of various synthetic resins,
A material with high electrical insulation properties such as a rubber elastic body or a wood material is desirable, and it may be bonded to the conductive tubular body 6 with an adhesive or the like. The shape of the tubular body 6 is designed to facilitate filling the resin between the inside of the conductive tubular body 6, that is, the space between the signal circuit conductor 3, and to prevent cracks from occurring after molding. It is effective to round the edges.

Regarding the embedding fitting 8, it is necessary to take the usual precautions when embedding it in a synthetic resin, such as improving adhesive strength by roughening the surface and rounding it to avoid stress concentration at the tip. It is. Regarding the lead wire 9, in order to maintain good adhesion with the synthetic resin 43, follow the dimensional changes of the synthetic resin due to heat, and prevent cracks from occurring, the surface of the lead wire 9 is roughened and a buffer layer made of a rubbery elastic material is formed. Formation etc. are effective.

FIG. 3 shows a second embodiment of the present invention,
Components that are the same as those in FIG. 2 are given the same reference numerals and their explanations are omitted.

This embodiment is different from the embodiment shown in FIG.
The insulating spacer 12 has a mounting structure of
The feature is that the weak current signal circuit conductor 3 and an insulating material such as synthetic resin are integrally molded in advance in an airtight and oiltight manner.

Therefore, for the formation dimensions of the conductive tubular body 11 in this embodiment, it is possible to apply, for example, the application of conductive paint, thermal spraying of metal, vacuum deposition of metal, plating, etc. The conductive tubular body 11 can be formed directly.
In particular, tubular bodies formed by aluminum spraying are
Since it is firmly attached to the insulating spacer, it will not peel off, and when molding is performed using, for example, an epoxy resin containing an inorganic filler as the synthetic resin 44, the tubular body 11 will be firmly attached to the resin 4. Since it is bonded without peeling or cracking, it is possible to manufacture a small multicore resin terminal with good airtight and liquidtight properties.

FIG. 4 shows a third embodiment of the present invention.
Components that are the same as those in FIGS. 2 and 3 are designated by the same reference numerals. This embodiment differs from the first and second embodiments in that the conductive tubular body 13 is formed of a perforated plate such as a wire mesh, and the entire outer periphery of the weak current circuit conductor 3 embedded in the synthetic resin 45 is covered. This means that it is covered seamlessly, thereby making it possible to more completely prevent the effects of electromagnetic induction from large current and high voltage circuits.

Furthermore, in this embodiment, the weak current circuit conductor 3
An insulating spacer for holding the gap 14 between the tubular body 13 and the tubular body 13 can be omitted. This is because the end of the tubular body 13 reaches near the surface of the resin 45, so by inserting a mold between the circuit conductor 3 and the tubular body 13 and determining their positions, the insulating spacer can be manufactured. This eliminates the need for mounting, simplifies the manufacturing process, and simplifies the configuration of the conductor portion.

FIG. 5 shows a fourth embodiment of the present invention.
Two tubular bodies 15a and 15b made of a conductive material and having different diameters are attached to the outer periphery of the conductor 3 for a weak current signal circuit via insulating spacers 16a and 16b. For this installation method, the tubular body 1
One end of the tubular body 15b is inserted into the end of the lead wire 5a, and each of the tubular bodies 15a, 15b is connected to the lead wire 1.
Electrical connections are made to each other at 8, and lead wires 9 are pulled out from the ends of these tubular bodies and connected to the embedded fittings 8, and then molded and hardened with synthetic resin 46.

With such a configuration, (1) the gap 17 between the conductor 3 and the tubular bodies 15a and 15b;
The resin can flow into the gap without any problem without taking measures to improve the inflow of the synthetic resin 46 into a or 17b, such as drilling holes or making cuts in the tubular body.

(2) Therefore, even if the material is not treated to improve resin inflow, it can be installed so as to cover the entire surface of the weak current signal circuit conductor 3, making it possible to more completely shield electromagnetic conduction from large current and high voltage circuits. It can be carried out.

(3) Since the tubular body is divided into multiple parts, thermal strain caused by the difference between the thermal expansion coefficient of the tubular body and the thermal expansion coefficient of the synthetic resin to be molded, and residual stress due to curing strain that occurs when the resin hardens, are , can be significantly reduced compared to a non-divided tubular body,
Therefore, it is possible to prevent peeling and cracks at the joint surface between the tubular body and the resin.

(4) Also, even if peeling or cracking occurs, the tubular body is made up of multiple members with different diameters, so
It does not grow into a continuous sky.

There is an effect.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, a tubular body made of a conductive material is installed coaxially on the outer periphery of a conductor for a weak current signal circuit, insulated from the conductor, and the inner and outer conductors are By using a reciprocating line, it is possible to eliminate the influence of electromagnetic induction from the conductor for a large current and high voltage circuit, and thereby make it possible to downsize the sealing multicore resin terminal.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing a conventional sealing resin terminal.
FIG. 2 is a cross-sectional view of a sealing multi-core resin terminal according to a first embodiment of the present invention, FIG. 3 is a cross-sectional view of a second embodiment of the present invention, and FIG. FIG. 5 is a sectional view showing the fourth embodiment of the present invention. 1...Conductor for large current/high voltage circuit, 3...Conductor for low current signal circuit, 41, 42, 43, 44, 45, 46
...Synthetic resin, 6, 11, 13, 15a, 15b...
Tubular body, 7, 12, 16a, 16b...insulating spacer.

Claims (1)

[Claims] 1. A sealing multicore resin terminal in which a conductor for a large current/high voltage circuit and a conductor for a weak current signal circuit are closely embedded in a composite resin, in which the conductor for the weak current signal circuit is A multicore resin terminal for sealing, characterized in that a tubular body made of a conductive material is installed coaxially with the conductor in an insulated manner on the outer periphery, and the inner and outer conductors are used as reciprocating lines. 2. In what is stated in claim 1,
A multi-core resin terminal for sealing, characterized in that an insulating layer is formed in advance on the surface of a conductor for a weak current signal circuit, and the surface of the insulating layer is covered with a conductive tubular body. 3 In what is stated in claim 1,
A sealing multi-core resin terminal characterized in that the tubular body is composed of a plurality of mutually electrically connected members having different diameters.