JPS5916382B2 - Fuse - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuse in which a partition wall made of fiber that melts at a predetermined temperature is provided between a plurality of fusing elements.

Conventionally, a fuse having a plurality of fusing elements has been constructed as shown in FIG.

In FIG. 1, 11 is an insulating tube, 2 is a terminal metal that closes both ends of the insulating tube 1, and 3 is an arc extinguishing agent filled in the insulating tube 1, for example, crushed sand of 10 to 200 mesh is used.

Reference numeral 4 designates a plurality of fusing elements connected between the metal plates 2 at both ends, which are spirally wound and arranged at predetermined intervals.

In such a fuse, when an overcurrent flows, the fusing element 4 melts and generates an arc, and the vaporized fusing element 4 diffuses into the gaps between the particles of the arc-extinguishing agent 3, as shown by the arrow in Fig. 2. At the same time, the arc-extinguishing agent 3 is melted and cooled by its latent heat of melting, thereby instantly forming an insulating product 5 as shown in FIG.

This insulating product 5 thus formed blocks excess current.

When the insulating products 5 are formed, if the mutual spacing between the fusing elements 4 is too close, the insulating products 5 will grow together, making it impossible to obtain a sufficient arc-extinguishing effect, resulting in poor breaker performance. may drop, and in some cases it may become impossible to shut off.

For this reason, it was necessary to set the diameter of the insulating tube 1 large in order to maintain appropriate spacing between the fusing elements 4.

In addition, the fusing element 4 normally remains stationary due to the tension F1 in the terminal metal 2 fixed at both ends and the arc extinguishing agent 3 filled around the periphery, but when an external force F2 acts in the radial direction due to vibration etc., the fusing element 4 As shown by the vector in the figure, the fusing element 4 moves the arc extinguishing agent 3 and vibrates and is displaced.

Since the diameter of the insulating cylinder 1 is set so that the fusing elements 4 do not come into contact with each other even with such vibrations, there is a drawback that the efficiency of accommodating the fusing elements is poor due to the large outer diameter of the fuse.

The present invention has been made in view of the above points, and provides a fuse in which the efficiency of accommodating fusing elements is improved by providing an insulating fibrous partition wall between the fusing elements.

This will be explained below based on the figures.

In FIGS. 5 and 6, 1 to 4 are the same as the conventional one.

Reference numeral 6 denotes a support member fixed to the pheasant metal 2; 7 is a partition made of a fibrous member having cotton-feeding properties and formed into a cloth or cotton shape, with both ends supported by each support member 6; The porosity is set to 20 to 80 inches so that the vaporized fusing element 4 can diffuse into the fibrous gaps.

It should be noted that glass cloth or the like is suitable for the partition wall 7, which cools the arc by latent heat of melting similarly to the antiporosis agent 3, and whose molten product instantly forms an insulator.

Next, the operation will be explained.

In FIG. 5, when an overcurrent flows and the fusing element 4 melts and vaporizes, a part of it diffuses into the gaps between the fibers of the partition wall 7 and
is melted and cooled by its latent heat of melting together with the arc extinguisher 3 to instantaneously form an insulating product 5 to cut off the overcurrent.

As shown in FIG. 6, the insulator 7 formed by this latent heat of melting is a molten product in which the fibers of the partition wall 7 and the particles of the arc-extinguishing agent 3 are melted and integrated, and the molten fusing element 4 will be replaced with

Further, as shown in FIG. 7, the same effect can be expected even if the partition wall 7 is composed of two sheets.

Furthermore, as shown in FIG. 8, by providing a cylindrical partition wall 7 between the main fusing element 4a and the display fusing element 4b, a similar effect can be expected, and the outer diameter of the insulating cylinder 1 can be reduced.

In the above embodiment, the fuse element is wound spirally, but the same effect can be obtained by using a fuse element configured in a zigzag manner.

According to this invention, the diameter of the insulating tube can be reduced by providing a partition wall made of fiber that melts at a predetermined temperature between a plurality of fusing elements, so that the fusing elements are normally maintained at a predetermined distance. be able to.

Furthermore, when the fusing element is fused, the arc is cooled by the latent heat of fusion, and overcurrent can be reliably cut off.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the structure of a conventional fuse, Fig. 2 is a sectional view illustrating the fusing of the fusing element, Fig. 3 is a sectional view illustrating the insulation product, and Fig. 4 is the effect on the fusing element. An explanatory diagram of force, FIG. 5 is a cross-sectional view showing the configuration of one embodiment of the present invention, FIG. 6 is a VI-VI cross-sectional view of FIG. 5, and FIGS. 7 and 8 show other embodiments. FIG. In the figure, 1 is an insulating cylinder, 2 is a metal terminal, 4 is a fusing element, and 7 is a partition wall. Note that the same reference numerals in each figure indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] 1 An arc-extinguishing agent is filled in an insulating cylinder whose both ends are closed with terminal metals, and a plurality of fusing elements are connected to both terminal metals, which is substantially the same as the above-mentioned arc-extinguishing agent. A fuse characterized in that a partition wall made of an insulating fibrous material having a porosity of 100% and meltable at a predetermined temperature is provided between each of the fusing elements. 2. The fuse according to claim 1, wherein the partition wall is made of glass cloth.