JPS6128346Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sealed structure for electrical equipment such as relays.

Conventionally, for example, a method for sealing relays and the like has been to fit a case onto a base with an insert terminal and a relay body, and to seal the case by injecting liquid resin along the fitting part with a syringe needle. It was getting worse.

However, as described above, the work of injecting liquid resin with a syringe needle is extremely inefficient, not only does it require a large amount of liquid resin, but it also has the drawback that the resin solidifies when exposed to the outside, which impairs the appearance. It was hot.

The present invention has been made in view of the above-mentioned drawbacks, and an object of the present invention is to provide a sealing structure for electrical equipment that is easy to seal, can be reliably sealed even with a small amount of resin, and does not damage the appearance.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings showing embodiments thereof.

1 to 3 show a first embodiment of the present invention,
1 is a relay which is an electrical device; 2 is a base having a relay body (not shown) therein and an insert terminal 3 protruding from the bottom surface; 4 is a case; the base and the case are made of synthetic resin.

The base 2 and the case 4 fit together at their openings, and a tunnel-shaped cavity 5 that is closed from the outside is provided between the joint surfaces of the base 2 and the case 4 over the entire circumference. There is. Furthermore, two small holes 6 and 7 communicating with the cavity 5 are provided on the upper surface of the case 4. The cavity 5 and the small holes 6 and 7 are filled with adhesive resin 8, and the base 2
The fitting portion between the case 4 and the case 4 is sealed (see Fig. 2).

Here, a method of sealing the relay 1 will be explained.

First, the case 4 is fitted to the base 2, and with the base 2 and the case 4 pressed together, a resin injection nozzle (not shown) is inserted into one of the small holes 6, 7, and the liquid is injected. The adhesive resin 8 is injected. Note that one of the small holes 6 and 7 is shaped like a mortar to fit the tip of the nozzle (the third
(see figure). The adhesive resin 8 flows into the cavity and fills the entire circumference of the fitting portion between the base 2 and the case 4 while expelling the air in the cavity 5 from the other small holes 7. When the filling is completed, the injection of the resin 8 is stopped, and the resin 8 is solidified to complete the sealing operation.

Note that, for example, if the case 4 is made of a transparent synthetic resin and the resin 8 is made of a colored resin, the state in which the resin 8 is filled into the cavity 5 can be visually observed.
You can check the sealing status.

FIG. 4 shows a second embodiment of the present invention, in which the base 1
Similar to the first embodiment, a cavity 12 is provided between the joint surfaces at the fitting portion between the case 11 and the case 11, and
A stepped portion 1 is provided around the entire circumference of the fitting portion except for the hollow portion 12.
3 and 14 are provided, and the stepped portions are used to position the base 10 and the case 11 when they are fitted, and to increase the contact area between the base 10 and the case 11 so that the resin filled in the cavity 12 ( (not shown)
This prevents the liquid from overflowing inside or outside the device. Note that in this case, the small hole 15 is provided on the side surface of the case 11.

FIG. 5 shows a third embodiment, in which a flat base 2
A groove 21 is provided on the outer peripheral end surface of the base 20 so as to cover the outer peripheral end surface of the base 20.
are fitted together. In this case, a cavity is formed between the groove 21 of the base 20 and the inner surface of the end of the case 22, and liquid resin is injected into this cavity through a small hole 23 provided on the bottom of the base 20. ing.

FIG. 6 shows a fourth embodiment, in which a flat base 3
0 and the open end of the case 31 are fitted together, a cavity 32 is formed in this fitting part, and a small hole 33 is provided in the side surface of the case 31.

Note that the present invention is applicable not only to relays but also to switches and the like, and various types of fitting between the base and the case are not limited to the above-mentioned embodiments. Furthermore, the base and case are not limited to synthetic resin, and may be made of metal.

As is clear from the above explanation, according to the present invention, a tunnel-shaped cavity that is closed from the outside is provided all around between the joint surfaces at the fitting part of the base and the case, and Since adhesive resin is injected into this cavity to seal the above-mentioned fitting part, there is no need to inject resin along the fitting part with a syringe needle as in the conventional case, and since the sealed part is a hollow part, , the injected resin will not leak outside. Therefore, the electrical equipment can be placed in a state where the resin injection work can be easily carried out. Therefore, the sealing operation becomes extremely efficient, and only a small amount of the resin is required since it is sufficient to fill the cavity. Furthermore, since the resin injection volume is constant, the resin injection time is almost constant, making work management easy. Furthermore, since the resin is hardly exposed to the outside of the device, there is no need to worry about damaging the appearance of the device.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a first embodiment of an electrical device according to the present invention, FIG. 2 is a partially enlarged sectional view at section A in FIG. 1, and FIG. 3 is an enlarged sectional view taken along the line - in FIG.
FIG. 4 is a partial sectional view of the second embodiment, and FIG. 5 is a partial sectional view of the third embodiment.
Partial sectional view of the embodiment, FIG. 6 is a partial sectional view of the fourth embodiment. 2, 10, 20, 30...base, 4, 11,
22, 31... Case, 5, 12, 32... Cavity, 6, 7, 15, 23, 33... Small hole, 8...
Adhesive resin, 13, 14... step portion, 21... groove.

Claims (1)

[Claims for Utility Model Registration] (1) In an electrical device consisting of a base with a device body and a case fitted to the base, between the joint surfaces when the base and the case are fitted,
A closed tunnel-shaped cavity is formed around the entire circumference, and a small hole communicating with the cavity is opened in at least a part of the base or the case, and the opening of the small hole is provided. A sealed structure for an electrical device, characterized in that the fitting portion is sealed by injecting an adhesive resin and filling the cavity. (2) The sealed structure for an electrical device as set forth in claim 1 of the utility model registration claim, characterized in that a stepped portion is provided over the entire circumference of the fitting portion excluding the cavity portion.