JPS6030020A - 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] This invention relates to improvements in temperature fuses.

Conventionally, various type A temperature fuses have been proposed and put into practical use. For example, as shown in FIG. 1, a fusible alloy 2 is connected between opposing lead wires 1, and an insulating container 3
in which both ends are completely sealed with sealing material 4,
In such temperature hinnies, after fusing, the soluble material is unevenly distributed because there is no connection at both ends of the lead wire, so the force to distribute the soluble material unevenly to both ends is weak, so the soluble material often remains in the center between the lead wires. Therefore, there is a risk that the insulation may be unreliable and a short circuit may occur.

It also had drawbacks such as slow fusing speed.

The object of the present invention is to provide a temperature fuse which can overcome the above-mentioned drawbacks.

According to this invention, since the fusible material is unevenly distributed in the metal member when the temperature fuse is blown, the fusible material is reliably blown out, and since no fusible material is left in the center between the lead wires, the fusible material is not left in the center between the lead wires. High insulation properties. This metal member may be a metal having good wettability with respect to the fusible material and may be provided around or a part of the connection portion, or may be formed into a hollow shape at the tip of the lead wire.

Further, according to the present invention, when the temperature fuse is blown, due to the difference in wettability between the inner surface of the insulating container and the metal piece with respect to the fusible material,
The fusing speed becomes faster.

Further, according to the present invention, since the interior of the fusible body is filled with 7 lux, as the temperature of the fusible body rises, the temperature of the flux rises and the solvent of the flux evaporates. For this reason, the pressure inside the fusible body increases, which speeds up the fusing speed of the fusible body and ensures reliable fusing.

Hereinafter, an embodiment of the present invention in which a metal member is provided around a connecting portion will be described based on the drawings.

In FIG. 2, 11 is a lead wire, 12 is a fusible material, such as an alloy made of tin, lead, cadmium, etc. 013 is a ceramic container, 14 is a heat-resistant sealant for sealing the container 13, and 15 is a A metal tube made of copper, copper alloy, etc., which has good wettability with the fusible body, or having a composition similar to that of the lead wire, is placed around the connection between the lead 1j311 and the fusible body 12, as shown in FIG. , are installed along the inner peripheral surface of the container 13.

When the temperature of the fusible body 12 of the temperature fuse composed of the above rises, the fusible body 12 softens and melts, contacts the container 13 and the metal pipework 5, and due to the difference in wettability between the container 13 and the metal pipe 15, A force acts to unevenly distribute the melted fusible alloy 12 in the metal pipe work 5, and as a result, as shown in FIG.
2 is quickly and reliably fused, and the fusible body 12 does not remain in the center between the lead wires.

Table 1 shows an example of experimental results for (a) a humidity fuse constructed as described above and (b) a temperature fuse obtained by removing the metal tube from the temperature fuse in (b). , the temperature is raised at a rate of 7 IC minutes from a temperature 20C lower than the melting temperature, and 0. The melting temperatures of these temperature fuses were measured by flowing an IA current.

(Leaving space below) As can be seen from Table I, the operating temperature of the temperature fuse in the example (a) has small variations in (b) and f (b), assuming the entire center of 146.6 IC.The temperature fuse in (a) has stable performance. It turns out that it has. Also, after the above experiment, 100OV
When I checked the insulation resistance at the time of application, ←) was 1012 Ω or more, and (b) was 1 () 10 Ω on average, and (
It was found that the thermal fuse (a) also has high reliability in terms of insulation after operation. This example shows a case in which a metal member is provided around the connection part, but it may also be possible to place a metal member around a part of the periphery instead of the entire circumference, or if the tip of the lead wire is made of the same material and formed into a shape. Almost similar results were obtained.

FIG. 5 shows another embodiment in which a soluble body 12 is filled with 7 lux 16, and this 7 lux contains, for example, gum rosin, amine hydrochloride as an activator, and isopropyl 7 as an organic solvent. /l/coal, etc., not only prevents the oxidation of the soluble material, but also has the function of accelerating the speed of fusing due to the pressure of the vapor of the organic solvent, as well as the 7 lux effect at the time of fusing. Furthermore, the second
Components that are the same as those in the figures are given the same reference numerals, and therefore their explanations will be omitted.

When the temperature of the fusible body 12 of the temperature fuse constructed as described above rises, the fusible body 12 softens, and the temperature of the flux 16 rises, causing the organic solvent in the flux having a boiling point lower than the melting temperature to vaporize. Therefore, the soluble body 12
When the internal pressure rises and the temperature further rises to reach the melting temperature, the softened fusible body 12 is destroyed and the flux 16 escapes, and at the same time, the fusible body 12 is melted as shown in FIG. let

Table ■ shows (a) the temperature fuse configured as described above and (
(b) This shows the experimental results of a temperature fuse with a conventional wire-shaped fusible body that is not filled with flux, and the melting temperature in silicone oil! D2
By increasing the temperature at a rate of 107 minutes from a low temperature of 0C,
．． The operating temperatures of these temperature fuses were measured by flowing an IA current.

As can be seen from Table ■, the operating temperature of the temperature fuse in the example (a) is centered around 146.65Ck, and (b) the fluctuation is small, and the temperature fuse in (a) has stable performance. I understand.

As described above, in this invention, a metal piece with good wettability to the fusible body is installed around the connection part between the fusible body and the lead wire, so that the melted fusible body is unevenly distributed on the metal piece. Therefore, the fusible material is reliably blown out, and no fusible material is left in the center between the lead wires, resulting in high insulation properties after fusing, and a faster fusing speed.

In addition, in this invention, since the inside of the fusible body is filled with 7 lux, as the temperature of the soluble body rises, 7 lux expands, destroys the entire softened soluble body, and secretly melts the soluble body f: , the fusing speed 'ft4J can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional temperature fuse, Fig. 2 is a sectional view of an embodiment of a temperature fuse, Fig. 3 is a sectional view taken along line T in Fig. 2, and Figs. 4 and 7. Explanatory diagram at the time of fusing, No. 5
The figure is a sectional view of a temperature fuse of another embodiment, and FIG.
FIG. 8, which is a sectional view taken along the line ■-■ in the figure, is a partially cutaway cross-section when the tip of the lead wire is shaped like a mouth. 11... Lead flA12... Fusible body 13... Container 14... Sealing agent

Claims (1)

[Scope of Claims] 1. A temperature fuse for connecting a fusible body and a terminal, characterized in that a metal member is installed around the connection portion between the fusible body and the terminal. 2. A temperature fuse for connecting a fusible body and a terminal, characterized in that the interior of the fusible body is filled with 7 lux.