JPS5914867B2 - insulated terminal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an airtight insulated terminal used, for example, when making an electrical connection between an electrical device housed in a metal airtight container and the outside. Suitable for use in boiling cooling type rectifiers filled with a liquid compound as a cooling medium and immersed in heat-generating semiconductor rectifying elements for large currents, and particularly commonly used in control or measurement equipment. The present invention relates to an airtight insulated terminal having a terminal conductor for conducting current.

The characteristics required for this type of insulated terminal are that it has high heat resistance, does not deteriorate over time, maintains extremely high airtightness (watertightness), has excellent corrosion resistance against cooling media, and has high thermal and mechanical impact strength. 5. Basic and current-carrying terminal conductors for mounting on containers, etc. (hereinafter simply referred to as ``carrying electrodes'')
In addition to the high insulation properties between the current-carrying electrodes (hereinafter simply referred to as "multi-electrode terminals"), the insulation properties between the current-carrying electrodes are high.
Since the insulation properties between the zero poles may deteriorate due to contamination during use, high creeping insulation properties are strongly required.

This requires long creepage insulation lengths.

In addition, it goes without saying that it is easy to attach to equipment etc.15 and that it is inexpensive. Conventionally,
Among the known insulated terminals of this type are those that use synthetic resin, rubber, glass, or magnetic materials as electrical insulators and airtight sealing materials. It has poor heat resistance and changes over time.
It is not particularly reliable in maintaining airtightness, and there are many problems in terms of corrosion resistance against cooling media.

Glass or porcelain materials maintain perfect performance in terms of airtightness and corrosion resistance, but they have poor thermal and mechanical impact resistance, and are therefore difficult to use when used in rectifiers installed in vehicles, etc. However, they had the fatal defect of being damaged by vibration, making it impossible to use them. 30 The present inventors have previously proposed an example of the technique shown in FIG. 1 as a solution to the drawbacks of the prior art.

(Japanese Patent Application No. 54-112160) In FIG. 1, reference numeral 1 indicates a base having a through hole 101 located in the center and a plurality of through holes 102 located outside the center.

This base body 1 is preferably made of a metal such as iron or stainless steel that can withstand heating of about 600°C, and its outer peripheral portion 10
The third part is attached to a necessary part, such as the container wall, by welding, screwing, or other suitable methods. 2a
2b is a conductive electrode located at the center of the through hole 101, and 2b is a conductive electrode located at the center of the through hole 102, and generally a good electrical conductor such as iron, titanium, or copper alloy, such as copper chrome, is preferably used.

If corrosion resistance is particularly required, platinum-plated titanium materials, for example, are also used. 3 is an insulator, which is made from a mixed powder of vitreous powder and mica powder, heated to a temperature where the vitreous material softens and flows under pressure;
This is glass obtained by pressure molding in a heated state, and is a molded body, which fills the spaces between the through holes 101 and 102 and the conducting electrodes 2a and 2b, respectively, and also fills the upper surface 104 of the base 1.
and covers the lower surface 105 as an insulating part 31, and further protrusions 2a-1, 2b from the insulating part 31 of the conducting electrodes 2a, 2b.
A creeping insulation portion 32 is formed by separately surrounding the circumferential surface of -1.

Although the prior art multi-pole terminal configured as described above can completely solve the drawbacks of the prior art, the formation of the creeping insulation portion 32 requires manufacturing problems due to the properties of the insulator 3. Due to its limitations, it does not pose any problem for normal use, but
Particularly when applied to applications where creeping insulation properties are strictly required, there is a problem in that the terminal must be made larger.

The present invention aims to provide an insulated terminal that also solves the problems of the prior art. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 2, reference numeral 4 denotes a covering that separately surrounds the peripheral surfaces of the protrusions 2a-1 and 2b-1 from the insulator 3 to form creeping insulation parts. This covering 4 was formed by molding the insulator 3 in the same manner as in the prior art described above, and then injecting and curing a solvent-free liquid organic resin using a special jig according to a known conventional technique. It is something. As this organic resin, epoxy resin or the like can be optimally used. In the above configuration, since the covering body 4 is provided by molding or casting with organic resin, there is no problem in increasing the creeping insulation length, and the desired creeping insulation characteristics can be obtained despite the small size. It became possible. In the above embodiment, the convex portion 33 is provided on the insulating portion 31.
However, even if the convex portion 32 is eliminated and the covering body 4 is configured with only the insulating portion 31, there is no problem and the same characteristic effects can be obtained. Further, in this embodiment, the convex portion 32 and the covering body 4 have the same shape on both sides, but in reality, there is no need to make them symmetrical on both sides.

For example, when used by attaching it to the wall of an airtight container filled with a liquid medium such as Freon, there is an extremely high risk that the creeping insulation resistance will decrease due to contamination on the outside surface of the container that is in contact with the outside air. On the other hand, the danger inside the container, that is, on the liquid medium side such as Freon, is extremely low. Therefore, for the part disposed inside the airtight container, a creeping insulation part 32 as shown in FIG. You may also use the side. In this case, since a long creeping insulation length is not required, the manufacturing becomes extremely easy and it becomes possible to obtain a low cost JC. As understood from the above explanation, the scope of application of the present invention is extremely wide and can be effectively used depending on the actual conditions of use.

It should be noted that the number of conducting electrodes 2a, 2b is of course not limited to what is shown in the drawings, and may be one or more.

In addition, in the above explanation, the target was an airtight insulated terminal for a rectifier that uses liquid as a medium, but the application is not limited to this, for example, for corrosion protection of containers filled with water,
It can also be used for metal containers filled with high-pressure gas, and its uses are extremely wide.

As described above, the insulated terminal according to the present invention has high performance and can be produced at low cost, and its effects are extremely large.

[Brief explanation of the drawing]

Figure 1 shows the structure of a conventional multi-pole insulated terminal.
A is a cross-sectional view, and b is a vertical cross-sectional view thereof. FIG. 2 shows an embodiment of the multi-pole terminal according to the present invention, in which a is a cross-sectional view and b is a longitudinal cross-sectional view thereof. In the figure,
1 is a base body, 2a and 2b are terminal conductors, 3 is an insulator, 31 is an insulating part, 32 is a creeping insulation part, and 4 is a covering body.

Claims (1)

[Claims] 1. A base body having a through hole, a terminal conductor penetrating the through hole with a gap therebetween, and sealingly fixing the through hole and the terminal conductor, and straddling the end face portion of the base body in the penetrating direction. An insulator made of a glass mica plastic body extends along the end surface and covers the end surface portion, and a covering body made of an organic resin surrounds the peripheral surface of the protruding portion of the terminal conductor to form a creeping insulation portion. Insulated terminal.