JPS5935138B2 - How to seal an electromagnetic relay - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for sealing an electromagnetic relay.

Conventionally, the method of sealing an electromagnetic relay is to house the base on which the relay body is installed in a case with a cross-sectional shape, and support the outer peripheral edge of the base with a step formed at the open end of the case. A relay is provided in which the terminals of the relay body and the base and the case are sealed by filling a recess formed by the bottom surface and the open end of the case with a filler.

However, in this case, since the area of the joint between the base and the case is small, the adhesive strength is low, and the joint has the disadvantage of peeling off due to heat or mechanical shock, resulting in loss of sealing performance.

Furthermore, since the contact area between the outer circumferential end of the base and the stepped portion of the case is small, there is a problem in that the filler flows into the case and interferes with the operation of the relay main body.

Therefore, it is possible to prevent the filler from flowing in by increasing the thickness of the case to increase the contact area between the step part of the case and the outer peripheral edge of the base, but this increases the size of the case and makes the electromagnetic relay as a whole larger. There is a drawback that.

The present invention has been made in view of the above drawbacks, and by increasing the area of the joint between the case and the base, the sealing performance is perfected without the filling material flowing into the case, and the thickness of the case is increased. The purpose of this invention is to provide a method for sealing an electromagnetic relay that does not require any sealing.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings, which are exemplary embodiments.

1 is a roughly box-shaped base made of synthetic resin;
is provided with side walls 2 around the entire circumference.

A relay main body 3 consisting of an electromagnet section and a contact mechanism section is housed in the base 1, and terminals 4 of the relay main body 3 loosely pass through the base 1 and protrude from the bottom surface.

A projecting wall 5 is provided around the entire circumference of the outer peripheral end of the bottom surface of the base 1, and a recess 6 is formed between the projecting wall 5 and the bottom surface of the base 1, and a recess 6 is formed between the projecting wall 5 and the side wall 2. An annular groove 7 is provided at the corner of the outer surface over the entire circumference, and a plurality of seal holes 8 are provided to communicate the recess 6 and the annular groove 7.

Reference numeral 10 denotes a case made of transparent synthetic resin, and has a cross-sectional shape with one end open.

When this case 10 is placed over the base 1, the case 10
The open end of the base 1 contacts the end surface of the projecting wall 5 of the base 1, and the tip of the side wall 2 of the base 1 contacts a step 11 formed on the inner surface of the case 10.

In this way, the base 1 and the case 10 are held in a fitted state, but there is a small gap δ between the side wall 2 of the base 1 and the inner surface of the case 10 (Figs. 3 and 4). (see figure)
.

Reference numeral 12 denotes a filler made of synthetic resin (for example, epoxy resin), which is filled into the recess 6 of the base 1 and seals the inside of the case 10.

That is, when the base 1 and the case 10 are fitted and turned upside down, and the recess 6 of the base 1 is filled with the filler 12, the filler 12 enters the gap between the protruding holes 9 of the terminals 4 of the base 1 and (See FIG. 4), the filler 12 flows into the annular groove 7 through the seal hole 8 and wraps around the entire circumference.

Furthermore, the filling material 12 that has flowed into the annular groove 7 is caused by a capillary phenomenon to create a gap δ between the side wall 2 of the base 1 and the inner surface of the case 10.
The filling material is hardened by being heated appropriately in this state, and the inside of the case 10 is completely sealed.

During the above-mentioned filling, since the joint between the side wall 2 of the base 1 and the inner surface of the case 10 has a sufficient area, the filler 12 does not flow into the case 10, and the joint between the side wall 2 of the base 1 and the inner surface of the case 10 does not flow into the case 10. It is firmly fixed.

In the above embodiment, a total of eight seal holes 8 were provided in the base 1, and an annular groove 7 was provided around the entire circumference, but the number of seal holes 8 may be only one, and the annular groove 7 does not necessarily have to be provided. good.

However, if one or more seal holes 8 are provided on each side and an annular groove 7 is provided that communicates with the seal holes 8, the filling material 12 can spread around more quickly and evenly.

As is clear from the above description, according to the present invention, a substantially box-shaped base with side walls around the entire circumference is covered with a case with one end open, and the projecting wall is formed at the outer peripheral end of the bottom surface of the base. Since the recess is filled with the filling material, the filling material flows through the sealing hole into the joint between the case and the base, which has a large area, and the filling material widely spreads over this joint.

Therefore, the filling material does not penetrate inside the case, so there is no problem that would hinder operation as with conventional electromagnetic relays, and the joints are firmly fixed by the filling material, so there is no risk of heat or mechanical shock. The sealing performance is good, with no peeling at the joint.

Furthermore, unlike the conventional case, there is no need to increase the thickness of the case to prevent intrusion of filler material, so there is no need to worry about increasing the size of the electromagnetic relay.

[Brief explanation of drawings]

Fig. 1 is a bottom view of the electromagnetic relay according to the present invention, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, Fig. 3 is an enlarged view of section A in Fig. 2, and Fig. 4 is a It is an enlarged sectional view taken along the line IV-IV. 1...Base, 2...Side wall, 3...
...Relay body, 4...Terminal, 5...
・Protruding wall, 6... recess, 7... annular groove,
8... Seal hole, 9... Terminal protrusion hole,
10...Case, 12...Filling material.

Claims (1)

[Claims] 1. A relay main body is housed in a substantially box-shaped base with side walls around the entire circumference so that its terminals protrude from the bottom surface of the base, and a projecting wall is provided on the outer peripheral edge of the bottom surface of the base. A case with one end open is placed over the base until the open end comes into contact with the projecting wall, and a sealing hole is provided in the bottom of the base leading to the joint between the case and the base, and the bottom of the base and the projecting wall are connected. The recess formed by the base and the case is filled with a filler, and the filler flows between the side wall of the base and the inner surface of the case through the sealing hole, thereby sealing the gap between the base and the case. How to seal an electromagnetic relay. 2. The method for sealing an electromagnetic relay as set forth in Patent No. 1, characterized in that an annular groove is provided along the entire circumference of the joint between the base and the case, and the annular groove communicates with the seal hole.