CN2282730Y

CN2282730Y - Fuse

Info

Publication number: CN2282730Y
Application number: CN 96220372
Authority: CN
Inventors: 高岳明
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-08-12
Filing date: 1996-08-12
Publication date: 1998-05-27
Anticipated expiration: 2006-08-12

Abstract

The utility model relates to a fuse, which comprises a metal casing, guide pins which are fixed at both ends of the casing, thermal sensitive body in the casing, a conducting contact sheet, a spring, a ceramic block, and insulation resin at the sealing end, wherein, an elastic ring is arranged between the end part of the guide pin and the ceramic block, and the end part of the guide pin is pressed with the conducting contact sheet. The utility model has the advantages of enhanced product performance, enhanced product acceptance rate, convenient processing, and convenient assembly. The utility model can be widely used for overtemperature protecting various electronic products and electrical apparatus products.

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 at present a kind ofly with the fuse of synthetic material as thermo-detective material, come circuit is carried out overtemperature prote.This fuse is to utilize thermo-detective material to melt at a certain temperature, because the promotion of contained spring makes conductive contact film break away from guide needle, fuse circuit is disconnected.Under normal circumstances, because conductive contact film is subjected to the thrust of spring always, simultaneously, wherein guide needle and spring are to be in same end, so often cause the contact force of the end of this guide needle and conductive contact film not enough, be easy to cause loose contact, make product rejection.Application number is " 96205896.3 ", " having the fuse that seals cap ", not only installs additional when sealing and seals cap, make product appearance attractive in appearance, guarantee seal quality, and internal structure is also improved, but it does not still overcome above-mentioned comparatively ubiquitous technical problem.

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

Task of the present utility model is achieved in that this fuse is the guide pin that is fixed by metal shell and housing two ends, and housing in thermo-detective material, conductive contact film, spring, ceramic block and seal insulating resin and form.An elastic ring is housed between guide pin end and the ceramic block; This metallic conduction sheet can be made up of metallic piston and the piston ring that is entrenched on this piston, piston ring contacts with housing, the guide pin end and the piston of housing one end compress mutually, and it is conducted by the guide pin of this piston and piston ring and the metal shell and the other end; This metallic conduction sheet also can be made up of metallic gasket, jump ring and annular shim, and jump ring contacts with housing, the guide pin end and the metallic gasket of housing one end compress mutually, and it communicates with other end guide pin by jump ring, metal shell; The sealing end of fuse installs additional and seals cap.

The utility model has installed spring coil additional with the guide pin end that conductive contact film compresses mutually, has increased the contact performance of this guide pin end and conductive contact film, can improve the performance and the certified products qualification rate of product so greatly.Use metallic piston and piston ring as conductive contact film simultaneously, can reduce the contact resistance of product, and in when assembling, can give earlier piston and piston ring assembled moulding after, once put into housing, can simplify assembly process greatly.

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

Fig. 1 is a kind of structure chart of the present utility model.

Fig. 2 is an another kind of structure chart of the present utility model.

Embodiment 1, and as shown in Figure 1, guide pin 1 is fixing with metal shell 2, puts into thermo-detective material 3 in housing 2 successively, conductive contact film A, and this conductive contact film A is made up of piston 4 and piston ring 5, and piston 4 all is to be made by the metal good conductor with piston ring 5.Piston ring 5 is embedded on the periphery of piston 4, and contact with metal shell 2, elastic ring 7 (can be a microsprings) is inserted in the rounded or taper of guide pin 11 top ends, pass the centre bore of ceramic block 8, after loading onto spring 6 between piston and the ceramic block 8, be pressed in the metal shell (2), guide pin 11 is closely contacted with piston 4, then with metal shell 2 edge bevellings, with high temperature insulation resin 9, for example epoxy resin seals curing.Preferably add one and seal cap when sealing, this seals cap and is formed by plastic injection-moulded.Have above-mentioned each in addition the guide pin 11 of the fuse of part pass the centre bore that seals cap, inject insulating resin 9 and be cured and get final product.During use, fuse place in circuit two ends, electric current is communicated with guide pin 1 by piston 4, piston ring 5, metal shell 2 by guide pin 11.Circuit hinders overvoltage for some reason and heats up, and thermo-detective material 3 reaches just fusing of fusing point, and spring 6 promotes piston 4 and piston ring 5 breaks away from guide pin 11 ends, thereby circuit is disconnected.

Embodiment 2, and as shown in Figure 2, the metallic conduction sheet A in the metal shell 2 of this fuse is made up of metallic gasket 14, jump ring 13 and annular shim 12.Jump ring 13 contacts with metal shell 2 and metallic gasket 14, and behind fuse two end guide pins (1), (11) place in circuit, guide pin 11 is conducted with guide pin 1 by metallic gasket 14, jump ring 13, metal shell 2.Circuit heats up because of overvoltage, thermo-detective material 3 fusings, and spring 6 promotes metallic gasket 14, jump ring 13, and circular pad 12 makes guide pin 11 ends hightail metallic gasket 14, thereby circuit is disconnected.All the other structures are identical with the foregoing description 1 in this enforcement, no longer repeat at this.

Claims

1, a kind of fuse, it is thermo-detective material (3), conductive contact film A in guide pin (1), (11) and the housing (2) that comprises metal shell (2), fixes with housing (2) two ends, spring (6), ceramic block (8), and the high temperature insulation resin (9) of sealing end forms, and it will be levied between the end that is the guide pin (11) that compresses mutually with conductive contact film A and the ceramic block (8) elastic ring (7) is housed.

2, fuse according to claim 1 is characterized in that described conductive contact film A can be made up of piston (4) and piston ring (5).

3, fuse according to claim 1 is characterized in that described conductive contact film A also can be made up of metal backing (14), jump ring 14 and annular shim (12).

4, it is characterized in that having one to seal cap (10) on the high temperature insulation resin (9) of sealing end of described metal shell (2) according to claim 2,3 described fuses.