JPS60220525A - 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 FIELD OF INDUSTRIAL APPLICATION The present invention relates to an improvement in a temperature fuse whose main components are an easily fusible metal and a flux.

Conventional Structures and Problems This type of temperature fuse is small, inexpensive, and has high-precision fusing performance, and has been widely used to prevent overheating in electronic equipment.

A conventional temperature fuse is shown in Fig. 1, in which an easily fusible metal 1, which has the characteristic of melting at a predetermined temperature or higher, is connected between terminal wires 2 and 2', and an oxidation prevention material is applied to the surface of this easily fusible metal 1. A thermoplastic resin 3 is applied, and the easily fusible metal 1 is housed in an insulating case 4 having openings at both ends, and the openings of the insulating case 4 are sealed with insulating paints 5, 6' by casting or the like. Is the temperature fuse configured in this way an opening in the insulating case 4? When sealing with insulating paint 5, 5' by casting, etc., it is difficult to stably supply the amount of insulating paint 6, 5', and if some of the thermoplastic resin 3 adheres to the insulating paint 6, 6', the sealing will be difficult. It becomes difficult to maintain the state, and the thermoplastic resin 3 becomes
If the terminal wires 2, 21 are ejected, the fusible metal 1 will oxidize and will not melt unless the temperature is higher than a predetermined temperature, or a gap will be created between the terminal wires 2, 2' and the insulating paint 5, 5'. Mechanical strength deteriorates. Also, insulation case 4
To seal, one opening is sealed with insulating paint 5, and then cured at a temperature lower than that of the thermoplastic resin 3 and fusible metal 1, and then the other opening is sealed with insulating paint 6', which is cured. The drawback was that it was not possible to design a continuous process. As described above, the temperature fuses manufactured in the past have the drawbacks of uneven cracking and failure, and unstable characteristics.

OBJECTS OF THE INVENTION In order to solve these conventional problems, it is an object of the present invention to provide a warm-temperature heater with excellent fusing characteristics and strong mechanical strength.

Structure of the Invention In order to achieve the above-mentioned object, the present invention covers the outer periphery of an easily fusible metal that melts at a predetermined temperature or higher with a thermoplastic resin having adhesive properties, and an insulating case having openings at both ends. A metal camp containing the easy-to-fusible metal part and a coated outer periphery is press-fitted into both openings of the insulating case, and all the terminal wires are connected to this metal cap, and the terminal wires, all the caps, and the easy-to-fusible metal are electrically connected. By adopting this structure, it is possible to prevent ejection of flux and deterioration of mechanical strength during operation.

Description of examples An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a sectional view of a temperature range fuse according to an embodiment of the present invention. In the figure, soot and lead.

A thermosetting resin 13 made of flux or the like and having an adhesive film is coated on the outer periphery of a filamentous easily fusible metal 11 made of bismuth, indium, cadmium, or an alloy thereof, and openings are made of glass, ceramic, etc. at both ends. Insert it from one opening of the insulating case 14 which has a section. Next, metal camp made of iron, copper, etc. or plated them 16,
16' are press-fitted and fixed to the outer periphery of both openings of the insulating case 14. If the inner diameter of the metal cap 15, 1°6' is slightly smaller than that of the insulating case 14, the fixation strength will be stronger when it is press-fitted. After sealing the openings at both ends with total loss gaps 15 and 15', the terminal wire 12.12", (12.12"), which was chucked almost at the center of the metal camp 15 and 1 s', was instantaneously heated to a high temperature by applying current to the metal camp 15. , 15
' Just like welding, we use the heat generated during welding to
Weld the fully bent camps 15 and 15' to both ends of the easily fused metal 1. The insulating paint 16 is applied to increase the sealing strength. When the temperature fuse thus obtained is raised in a temperature atmosphere of 1 DEG C./min, it is adsorbed to the metal caps 15, 15' and fused, as shown in FIG.

Effects of the Invention As explained in detail above, the temperature fuse according to the present invention is superior to conventional products because the terminal wire and the fusible metal are not directly connected, and because the metal cap is firmly fixed to the insulating case. It eliminates the disadvantages of flux spouting or deterioration of mechanical strength during operation, has high precision and low cost performance, and can be easily sealed with two openings, making it suitable for mass production and providing a complete range of inexpensive temperature fuses. So, it is a dog of practical effect.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a conventional temperature fuse before blowing out, Fig. 2 is a cross-sectional view of an embodiment of the temperature fuse of the present invention before blowing out, and Fig. 3 is a cross-sectional view of the same bath 1u [later cross-sectional view]. be. 11... Easily fusible metal, 12, 12'... Terminal wire, 13... Heat softening resin, 14... Insulating case, 16°15'...・Metal gap,
16 Rivers: Insulating paint.

Claims (1)

[Claims] The easily fusible metal part is housed in an insulating case with openings at both ends, which is rich in heat-softening resin having franking properties and adhesive properties on the outer periphery of the easily fusible metal that melts at a specified temperature or more, and the metal cap has the outer periphery plated. is press-fitted into both openings of the insulating case, a terminal wire is connected to this metal camp, and the terminal wire is electrically connected to the metal cap and the fusible metal to form a temperature fuse.