JPS5927425A - Method of producing electromagnetic relay - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing an electromagnetic relay that is covered with a cover to provide airtightness.

For example, after a printed board relay is mounted on a printed board, predetermined electrical connections are generally made by soldering, but it is necessary to clean it to remove contaminants such as solder flux. Conventionally, as shown in FIG. 1, such a relay has a structure in which a cover 2 provided with a ventilation pipe 1 is hermetically sealed to a relay base 3 by integral molding or the like. Then, after immersing the relay attached to the printed circuit board in a cleaning tank and cleaning it thoroughly, the tip of the ventilation pipe 1 is cut to create an exhaust path for organic gas generated by the heat generated by the coil etc. while the relay is in use. It was forming.

However, when an adhesive sealant is used to seal the cover 2 to the relay base 3, the air inside the relay expands when the sealant is heated and dried, and the expanded and pressured air is not sufficiently dried. This has the drawback that the sealant may be discharged from a part of the sealant, which causes pinholes to occur in the sealing part, impairing its airtightness.

An object of the present invention is to provide a method for manufacturing a relay in which the pinhole does not occur, and this object is to provide an electromagnetic relay that is made airtight by covering the electromagnetic relay with a cover and sealing the periphery of the cover with an adhesive. This is achieved by a method of manufacturing an electromagnetic relay, characterized in that the cover is provided with a cylindrical opening projecting to the outside, and the tip of the opening is sealed after the adhesive is dried and hardened.

The present invention will be explained below using the drawings.

FIG. 2 is a perspective view of an electromagnetic relay according to an embodiment of the present invention, with the internal structure omitted, FIG. 3 is a side sectional view of the electromagnetic relay before the ventilation pipe is sealed, and FIG. 4 is a side sectional view of the electromagnetic relay before the ventilation pipe is sealed. A later side sectional view is shown.

In FIG. 2, a relay base 3 made of an insulating material and having a rectangular shape in plan view is covered with a cover 4 made of a thermoplastic material such as polycarbonate resin by molding. is hermetically sealed to the inner surface of the At the time when the cover 4 is airtightly sealed, the hollow protrusion-shaped ventilation pipe 5 provided at the center of the upper surface of the cover 4 has an open end 5a, as shown in FIG. Therefore, when the adhesive sealant applied to the sealed portion of the base 3 and the cover 4 is heated to dry it, the air pressure inside the cover 4 will not become higher than the surrounding atmosphere. Next, as shown in FIG. 4, the cover vent pipe 5 of the relay after the adhesive sealant has been dried is thermally welded and sealed by thermo-electromagnetic clamping or the like. However, the hollow part 6 in the vent pipe 5 after heat welding is connected to the inside and outside of the relay by attaching the relay to a printed board, soldering it, washing off the solder flux, etc., and then cutting the tip 5a. It becomes a ventilation hole.

In the above embodiment, the cover 4 is made of a thermoplastic material, but it can also be made of other plastic material, such as a metal material such as aluminum, and crimped to seal the ventilation pipe. Can be applied. In addition, a ventilation pipe 5 is provided at one location in the center of the upper surface of the cover 4, but the number, position, size, shape, etc. of the ventilation pipe 5 are determined by the cover's original role, that is, to prevent dust from entering and to connect the relay to a printed board, etc. It can be determined taking into consideration that the mounting density will not be reduced when mounted. Furthermore, when sealing the vent pipe tip 5a, taking into consideration that the period from sealing to cutting and opening is long, and that the storage environment (temperature and humidity, etc.) changes greatly during the period, Filling the cover (relay) with inert gas or dry air is effective in maintaining the electrical characteristics of relay components such as contacts.

As explained above, the method for manufacturing an electromagnetic relay according to the present invention improves the reliability of the seal because the air pressure inside the relay is not increased when the relay base and cover are sealed with an adhesive sealant. In addition, since the organic gas generated when the adhesive sealant dries does not remain in the relay, the initial electrical characteristics of the components can be maintained.

[Brief explanation of the drawing]

Figure 1 is a perspective view of an electromagnetic relay with the internal structure omitted, Figure 2
The figure is a perspective view of an electromagnetic relay with the internal structure omitted according to an embodiment of the present invention, FIG. 3 is a sectional view of the electromagnetic relay shown in FIG. 2 before the ventilation pipe is sealed, and FIG. Side sectional view of the vent pipe shown in the figure after sealing, Trachea 4-, f711ii] Fig. 3 4th concave

Claims (1)

[Claims] In an electromagnetic relay that is made airtight by covering the electromagnetic relay with a cover and sealing the periphery of the cover with an adhesive, the cover is provided with a cylindrical opening that protrudes to the outside, and after the adhesive dries and hardens, the tip of the opening is sealed. A method for manufacturing an electromagnetic relay, characterized by sealing the relay.