JPS5893132A - Method of producing temperature fuse - 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 for manufacturing a thermal fuse, which comprises storing fusible pellets in a cylindrical case.

This type of temperature fuse is constructed as shown in FIG. That is, in a cylindrical conductive case 2 to which the first lead wire 1 is connected, a lumpy soluble pellet 3 and a movable conductive plate 4 are placed via a hold spring 5, and the movable conductive plate 4 and the second A ceramic insulator 7 supporting a lead wire 6 is disposed via a bushing spring 8. A hardening resin such as epoxy V resin is applied or a layer 9 is provided on the outer end of the insulator.

In such a temperature fuse, since the soluble pellets 3 are solid at room temperature, the soluble pellets 3 and the movable conductive plate 4
A fixed interval is maintained between the first
A conductive path is formed between the lead wire 1 and the second lead wire 6. However, it is different.

When the fusible pellet 3 melts due to a rise in normal temperature, the hold spring 5 changes from a compressed state to an expanded state, so the movable conductive plate 4 is moved by the force of the bushing spring 8 as shown in FIG.
It moves to the left and separates from the tip 61 of the second lead wire 6, cutting off the conductive path.

By the way, conventionally, in the process of manufacturing such a temperature fuse, after assembling each component into the case 2 and providing a sealing layer 9 made of a curable resin on the outer end of the insulator, it is placed in a constant temperature oven and heated to a high temperature (80 to 110℃). The sealing layer 9 is cured by heating at a temperature of Alternatively, minute pores are formed, which tends to cause problems such as deterioration of withstand voltage characteristics and poor appearance.

The present invention has been made in order to solve this problem, and it is an object of the present invention to provide a method of manufacturing a temperature fuse in which bubbles and the like are not generated in the sealing portion.

In the manufacturing method of the present invention, an insulator 7 supports a fusible pellet 3, a hold spring 5, a movable conductive plate 4, a push strip 9 ring 8, and a second lead wire 6 in a conductive case 2.
After sequentially storing each component such as Temporarily seal the opening periphery of the case and each contact portion with the second lead wire with a fast-curing adhesive. Thereafter, a curable resin is applied on the outer end of the insulator and the abutting portion to form a sealing layer.

As the fast-curing adhesive, an instant adhesive such as Aron Alpha (trade name), which hardens in a few seconds, or a fast-curing adhesive, such as Araldite (trade name), which hardens in a few minutes, is used.

As mentioned above, a temporary seal is provided on the outer end of the insulator exposed from the open end of the conductive case during drying, and then a layer of hardening resin is provided to prevent gas from occurring inside the case. Therefore, there is no occurrence of air bubbles or the like in the rail layer.

Next, the present invention will be explained in detail.

Example 1 As shown in FIG. Pour temperature 100-11
The inside of the case 2 is dried by heating at 0° C. for 30 to 60 minutes, and under this heated state, the contact portions 10 and 11 between the outer end of the insulator, the periphery of the opening of the conductive case, and the second lead wire 6 are coated with iron alpha. Make a temporary seal with (product name). Thereafter, a sealing layer 9 was provided by coating the outer end of the insulator with Nieboxy resin, and this sealing layer was cured.

There were no bubbles or minute holes in the temperature fuse layer obtained in this way, and the specified withstand voltage test (
It completely passed the pellet fusing test (withstanding 1.5 KV for 1 minute).

By baking an insulating coating such as fluororesin, Teflon, formal resin, etc. on the outer surface of the bushing spring, the withstand voltage between it and the tip of the second lead wire can be improved, making it suitable for higher voltage applications. It is possible to manufacture temperature fuses.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view showing a temperature fuse,! Figure J2 is a simplified diagram for explaining the present invention in detail. 1 ・・・・・・・・・・・・ 1st lead wire 2 ・・
・・・・・・・・・・ Conductive case 6 ・・・・−・・
・・・・・・ Fusible pellet 4-・・・・・・・・・・・・
Movable conductive plate 5 ...... Hold spring 6 ...... Second lead wire 7 ...... Insulator 8...
・・・・・・・・・ Bush Spring 9 ・・・・・・
・・・・・・ Seal layer 10.11・・・・・・ Patent attorney representing the contact department Satoshi Suyama - Same as above Yama 1) Shin Akira

Claims (1)

[Claims] 1. A soluble pellet, a hold spring, a movable conductive plate,
After storing the bushing spring and the insulator that supported the second lead wire in order and bringing the opening periphery of the conductive case into close contact with the outer edge of the insulator, the inside of the conductive case is dried at high temperature, and under this condition, the insulation The outer end of the body, the opening periphery of the conductive case, and the second
Each contact portion with the lead wire is temporarily sealed with a fast-curing adhesive, and then a curable resin is applied on the outer end of the insulator and the contact portion to form a sealing layer. A method for producing wrinkled fuses.