CN2456307Y

CN2456307Y - Communication protective current limited fuse

Info

Publication number: CN2456307Y
Application number: CN 00268756
Authority: CN
Inventors: 马志成; 吴一艾; 刘罗曼; 李萍; 范增强; 李北; 吴大刚; 刘季平; 袁周亮
Original assignee: XI'AN FUSE MANUFACTURING Co
Current assignee: Cooper Xi'an Fuse Co., Ltd.
Priority date: 2000-12-31
Filing date: 2000-12-31
Publication date: 2001-10-24
Anticipated expiration: 2010-12-31

Abstract

The utility model discloses a protective current limiting fuse for communication, which comprises a fusion tube. Solution is penetrated in the fusion tube, and the rest parts are filled with quartzite. Both ends of a fused mass are respectively and hermetically sheathed with a cap. The fused mass is formed by punching a silver belt. Narrow necks which are in a rectangular hole shape are processed on different axial directions of the fused mass. The utility model is easy to match other overcurrent protection devices in a system, and has high performance of aspects of ablation fault current and current limiting. The utility model can avoid resulting in mechanical and thermal damage due to the large failure current, and has large rated values of an opening and breaking direct current voltage and the direct current failure current.

Description

Communication is with protecting current limiting fuse

The utility model belongs to low-voltage AC and DC protection electrical equipment, is applicable to communication apparatus and other general circuit and electric prospection.

At present; China's communication career is developed under the promotion of international communications industry rapidly; and in communication apparatus, use the AC and DC low-voltage in a large number; little current protection fuse, and existing alternating current-direct current low-voltage, little current protection all can't satisfy the specific (special) requirements of communications industry to fuse with fuse in thread many-sides such as ampere-time characteristic, electric property, overall dimensions.

The purpose of this utility model is to overcome the shortcoming of above-mentioned prior art, and a kind of suitable communications market requires, reliable, high performance communication protection current limiting fuse is provided.

For achieving the above object, the technical solution adopted in the utility model is: it comprises a fusion tube, and solution penetrates in the fusion tube, the fusion tube remainder is full of quartz sand, melt is formed by the pure silver belt punching out, and bath surface is with the tin cadmium alloy, upwards is processed with the rectangle hole shape narrow neck in the disalignment of melt.

Because the utility model fuse adopts current-limiting type; and be suitable for other overcurrent protective device apolegamy in the system; superior function with excision fault current and current limliting aspect; can avoid machinery and damage heat that causes than major break down electric current and low power overload current, the rated value that cut-offs direct voltage and direct current fault current is all bigger.

Fig. 1 is the structural representation of first embodiment of the utility model, and wherein Fig. 1 (a) is a front view, and Fig. 1 (b) is a left view.

Fig. 2 is the structural representation of second embodiment of the utility model, and wherein Fig. 2 (a) is a front view, and Fig. 2 (b) is the A-A view.

Fig. 3 is the structural representation of the 3rd embodiment of the utility model.

Below in conjunction with drawings and Examples structural principle of the present utility model and operation principle are described in further detail.

Referring to Fig. 1, in the present embodiment, the utility model comprises a fusion tube 3, dispose melt 5 in the fusion tube 3, there is cap 2 at the two ends of melt 5 big envelope respectively, the outer end of two caps 2 disposes contact knife 6 respectively, melt 5 is formed by the pure silver belt punching out, upwards be processed with into the hole 9 of the narrow neck of rectangle in the disalignment of melt 5, and on melt 5, have the tin cadmium alloy, be used for producing " M " effect, with pad 1, cap 2 and melt 5 usefulness tin are welded as a whole, be inserted in the fusion tube 3, again with the pad 1 of the other end, cap 2 and melt 5 are by welding with quadrat method, be inserted in the fusion tube 3, the other parts of fusion tube 3 are full of quartz sand 4, and the silver-colored soldering of contact knife 6 usefulness with two ends is connected on the cap 2 again, present embodiment adopts the bus mode to connect, and the utility model is fixed by bolts on the external cabling terminal and can uses.

Referring to Fig. 2, in the present embodiment, melt 5 and contact knife 6 are welded as a whole, be pressed in the fusion tube 3, connect fusion tubes 3, quartz sand 4 is packed in the fusion tube 3 with pin 8, after enriching stopper 7 is pressed in the contact knife 6, the design of melt is with embodiment 1, and present embodiment adopts bolt to connect, and directly with bolt present embodiment is fixed on the binding post.

Referring to Fig. 3, in the present embodiment, fusion tube 3 two ends do not have contact knife 6, and the connecting relation of other parts is with embodiment 1.

Operation principle of the present utility model is: fuse is sealed in the circuit of protected electric equipment; when overload or short trouble take place in circuit; because the thermal effect of electric current; make the melt of fuse melt rapidly, vaporize; gap breakdown, arcing take place subsequently and by the quartz sand extinguish arcs; divide deenergizing, reach the purpose of protection electric equipment.

The utility model is applicable on indoor interchange 50Hz rated voltage AC250～600V and dc rated voltage DC170～600V communication apparatus and general circuit and the electrical equipment.

Claims

1. a communication is with protecting current limiting fuse; it comprises a fusion tube (3); solution (5) penetrates in the fusion tube (3); remainder is full of quartz sand (4); there is cap (2) at the two ends of melt (5) big envelope respectively; it is characterized in that: solution (5) is formed by the pure silver belt punching out, upwards is processed with the rectangle hole shape narrow neck in the disalignment of solution (5).

2. communication according to claim 1 is characterized in that with protecting current limiting fuse: said melt (5) surface is with the tin cadmium alloy.

3. communication according to claim 1 is with protecting current limiting fuse, and it is characterized in that: the outer end of said cap (2) disposes contact knife (6) respectively.

4. communication according to claim 1 is characterized in that with protecting current limiting fuse: said melt (5) is configured to one with contact knife (6), disposes stopper (7) in the contact knife (6).