CN2286924Y - Fuse - Google Patents

Abstract

The utility model relates to a fuse, which comprises a metal casing, a conductive pin which is fixed to one end of the casing, a thermal sensor which is arranged at the end of the casing, wherein, the pin-out of the other conductive pin, which is arranged at the sealing end of the casing, passes through a ceramic block to be insulated with the casing; the end of the conductive pin at the sealing end is butted with the central hole of a conductive contact disk in the casing whose circumference wall is contacted with the casing; a spring is arranged between the conductive contact disk and the ceramic block, and the conductive contact disk is provided with a cone central hole which is butted with the conical tip of the conductive pin. The utility model can operate without bad contact phenomenon, when fused for overheating, the operation is still stable and reliable.

Description

Fuse

The utility model relates to a kind of fuse, and it is a kind of essential electronic element.

In electronics, electric equipment products, generally use a kind of at present with the fuse of synthetic material as thermo-detective material.This fuse is to utilize inner thermo-detective material to melt at a certain temperature, because the promotion of spring makes conductive contact film break away from guide needle, the electric current between the fuse two end guide pins is disconnected, thereby entire circuit is carried out overtemperature prote.Application number is " 96205896.3 ", " have the fuse that seals cap " and application number is " 96220372.6 ", " fuse ", though on outward appearance and inherent quality, done improvement, but still can not solve fuse and easily come in contact bad problem in working order the time, so fundamentally can't effectively change the performance and the quality of product.

The utility model provides a kind of performance more reliable and stable novel fuse at the defective of above-mentioned prior art to society.

Task of the present utility model is achieved in that this fuse comprises metal shell, the guide pin that fixes with housing one end, and in the housing of this end, be placed with thermo-detective material, the leading foot of another root guide pin of housing sealing end passes ceramic block and housing insulation, the end of this guide pin compresses mutually with the centre bore of the interior conduction of housing contact disc, the circle wall of conduction contact disc contacts with housing, be placed with spring between conduction contact disc and the ceramic block, the centre bore of the conduction contact disc of this fuse is tapered, the end of the guide pin that compresses mutually with it is a bullet, sealing end at housing has the high temperature insulation resin and seals cap, electric current is by the guide pin of fuse sealing end, communicate with other end guide pin by conduction contact disc and metal shell, otherwise also can; Have some axial grooves on the periphery wall of conduction contact disc, make the high resilience of contact disc outer wall, make the conduction contact disc contact tightr with housing; Between conduction contact disc and thermo-detective material, can place an elastomeric pad or pagoda shape spring, it both can improve the contact performance between guide pin end and the conduction contact disc, again can be when thermo-detective material melt, the conduction contact disc can hightail the guide pin end, makes action more steady.

The taper surface that the utility model adopts the guide pin end with conduct electricity contact disc tapered centre hole and compress method mutually, increased the contact area between them, improved contact performance, thereby when making fuse in working order, can overcome the problem of loose contact.The utility model changes the performance and the quality of existing fuse effectively.

Below in conjunction with accompanying drawing the utility model is further described.

Fig. 1 is a kind of structural representation of the present utility model.

Fig. 2 is an another kind of structural representation of the present utility model.

Embodiment 1, as shown in Figure 1, the guide pin 11 that is fixedly connected with metal shell 4 one ends, in housing 4, put into thermo-detective material 10 successively, pad 9, pagoda shape spring 8, conduction contact disc 7, have some axial grooves on the periphery of conduction contact disc 7, its circle wall contacts with metal shell 4, the leading foot of another root guide pin 1 of the sealing end of metal shell 4 passes ceramic block 5 and housing insulation, and the conical end of guide pin 1 compresses mutually with the conical central hole of conduction contact disc 7, between conduction contact disc 7 and ceramic block 5, put spring 6, then with metal shell 4 sealing end edge bevellings, put with what different colours was represented different fusing-off temperatures and seal cap 2, inject high temperature insulation resin 3 and seal curing.During use, with fuse two end guide pins difference place in circuit two ends, electric current is communicated with other end guide pin 11 by conduction contact disc 7 and metal shell 4 by guide pin 1, and vice versa.Circuit hinders for some reason and generates heat, when reaching the fusing point of thermo-detective material 10, and thermo-detective material 10 fusings; because the promotion of spring 6, make the centre bore of conduction contact disc 7 hightail the conical end of guide pin 1, the failure of current between guide pin 1 and the guide pin 11; circuit is disconnected, play the effect of overvoltage overtemperature prote.

Embodiment 2, as shown in Figure 2, adorn an elastomeric pad 12 (it can make the taper seat of guide pin 1 contact closelyr with the conical bore of conductor contact disc 7) between 1-guide pin, 2 among the figure-seal cap, 3-insulating resin, 4-metal shell, 5-ceramic block, 6-spring, 7-conduction contact disc, 10-thermo-detective material, 11-guide pin, the 12-elastomeric pad, the utility model conduction contact disc 7 and thermo-detective material 10.Hinder for some reason when overheated at circuit, thermo-detective material 10 fusings, spring 6 promotes the end that conduction contact discs 7 take off high guide pin 1, and circuit is disconnected.Its structural principle and embodiment 1 mutually roughly the same do not remake enumeration at this.

Claims (4)

1, a kind of fuse, it comprises metal shell (4), the guide pin (11) that is fixedly connected with housing (4) one ends, in the housing (4) of this end, be placed with thermo-detective material (11), the leading foot of another root guide pin (1) of housing (4) sealing end passes ceramic block (5) and housing (4) insulation, the end of this guide pin (1) compresses mutually with the centre bore of housing interior conduction contact disc (7), the perisporium of conduction contact disc (7) contacts with housing (4), be placed with spring (6) between conduction contact disc (7) and the ceramic block (5), the centre bore that it is characterized in that described conduction contact disc is tapered, and the end of the guide pin (1) that compresses mutually with it is a bullet.

2, fuse according to claim 1, the perisporium of contact disc (7) of it is characterized in that conducting electricity has some axial grooves.

3,, it is characterized in that conducting electricity and place an elastomeric pad (12) between contact disc (7) and the thermo-detective material (10) according to claim 1,2 described fuses.

4,, it is characterized in that conducting electricity and place pagoda shape spring (8) between contact disc (7) and the thermo-detective material (10) according to claim 1,2 described fuses.