JP3196848U - Limiter fuse - Google Patents

Abstract

A limiter fuse is provided which increases the thickness of a heat-resistant insulating plate and expands the volume of a storage chamber in which a fusible portion is stored to increase the rated voltage value. Both terminals have groove width notches 1a and 1b, and a projecting portion 1c left on both sides of the central portion so that the long sides of the deformed T-shape are opposed to each other, and a pair of E-shapes closing the same. A conductive metal thin plate in which a soluble portion 1d at the center between the sandwiching plate 7 and both terminals is formed by integral pressing, and further a conductive portion without a soluble portion 1d having the same shape as the groove width notches 1a and 1b of both terminals. The reinforcing metal plates 2 and 3 are stacked, and the first heat-resistant insulating plate 4, the heat-resistant insulating transparent plate 5 and the second heat-resistant insulating plate 6 are sequentially stacked on the reinforcing metal plates 2 and 3, and then fixed by caulking metal fittings. In the limiter fuse, the rated voltage is increased by increasing the thickness of the second heat-resistant insulating plate 6 in contact with the fusible part 1d so as to expand the volume of the shut-off chamber serving as a space for housing the fusible part 1d. The value can be increased to a voltage value at least twice as high. [Selection] Figure 2

Description

The present invention relates to an improvement of a small DC low voltage high current (limiter) fuse mainly used in a DC power supply circuit such as a battery.

Conventionally, a limiter fuse having a structure as shown in FIG. 1 in which a thin plate of a good conductor metal is based on an integrated press process including a fusible portion at both terminals and a center, and a heat-resistant insulating material is overlapped and fixed thereto is known. It had been.
In FIG. 1, (a) and (b) are terminal cutouts, (c) and (d) are opposing protrusions, and E-shaped sandwiching plates (e), (e) and (f) have soluble parts. It is an integrated press working base of a good conductor metal sheet. (H) and (R) are conductive reinforcing metal plates having the same shape as the groove width notches of both terminals. (Nu) is a first heat-resistant insulating plate, (le) is a heat-resistant insulating transparent plate, (e) is a second heat-resistant insulating plate, and (wa) is a caulking fitting.

Known limiter fuses are stacked in a stacked manner by a combination of the above-described members, and are fixed by a plurality of caulking fittings (wagers).
As can be seen from this structure, the increase / decrease in the volume of the blocking chamber in the space in which the limiter fuse fusible portion is accommodated is determined by the thickness of the second heat-resistant insulating plate (e).

As a result, there is a problem that the thickness of the second heat-resistant insulating plate of the conventional product is only a DC rated voltage value and the volume of the shut-off chamber is up to about 48 volts, and there is no tolerance at a voltage value higher than that. there were.
That is, Ax Bx C ≦ 48V (dc)

Both terminals have a groove width notch, a projecting part left on both sides of the center part so as to oppose the long side of the deformed T shape, and a pair of E-shaped sandwiching plates that close the protruding part between the two terminals A good conductor metal thin plate with a fusible part at the center formed by integral pressing, and a conductive reinforcing metal plate without the fusible part of the same shape as the groove width notch of the two terminals are overlapped, and this is the first heat resistant insulation In the limiter fuse in which the plate, heat-resistant insulating transparent plate, and second heat-resistant insulating plate are stacked one after the other and then fixed by caulking fittings, the volume of the shut-off chamber that becomes the space for storing the fusible part is expanded. As described above, the problem is solved by increasing the thickness of the second heat-resistant insulating plate in contact with the fusible part so that the rated voltage value can be increased to at least twice the voltage value. .

As described above, it is only necessary to increase the thickness of the second heat-resistant insulating plate in terms of the fuse configuration, so that the assembly is easy and the production efficiency can be improved satisfactorily.

  Exploded plan view and side view of a conventional limiter fuse   Exploded perspective view of the limiter fuse of the present invention   Side view of the limiter fuse of the present invention

The limiter fuse of the present invention is easy to work because the breakable chamber of the fusible part can be expanded to any size by increasing the thickness of the second heat-resistant insulating plate among the conventional components. By increasing the volume ratio of the chamber to more than twice, it can be upgraded to the rated voltage value.
Ax Bx C ′> 48 to 96 V (dc)

Hereinafter, an embodiment will be described with reference to the drawings.
In FIG. 2, 1 is a good conductor metal thin plate, 2 and 3 are conductive reinforcing metal plates, 4 is a first heat-resistant insulating plate, 5 is a heat-resistant insulating transparent plate, 6 is a second heat-resistant insulating plate, and 7 is an air-resistant plate. The character-shaped sandwiching plate 8 is composed of caulking metal fittings, and a common small hole H through which the caulking metal fitting 8 is inserted is formed in a predetermined position of each member in advance, and is finally caulked and fixed by pressing. The

The material of the above members is copper or silver for a good conductor metal plate, copper or brass for a conductive reinforcing metal plate, an E-shaped sandwiching plate, first and second heat-resistant insulating plates are silicon substrates containing glass fiber, heat-resistant insulating transparent The board uses a car, which can be machined easily and easily.

Further, the good conductor metal thin plate 1 has groove width notches 1a and 1b at both terminals, and a protruding portion 1c in which both ends of the central portion are left so that the long sides of the deformed T-shape are opposed to each other, and a centerable The melted portion 1d is provided with a narrow portion so that it can be quickly cut according to the magnitude of the current.
And it consists of the conductive reinforcement metal plates 2 and 3 without the soluble part of the same shape as the groove width notches 1a and 1b of both terminals.
Further, a peephole 4a is provided at the center of the first heat-resistant insulating plate 4, and thus the fusing state (presence / absence of fusing) of the fuse-fusible part can be visually confirmed. .

FIG. 3 is a side view of the limiter fuse of the present invention. By increasing the thickness of the second heat-resistant insulating plate 6, the assembled state of the assembled product is C ′> C compared to the conventional product. It can be seen that the volume of the shut-off chamber has increased.
As a result, it is possible to rank up to a voltage value exceeding the conventional low voltage rated value of 48 V (dc) at the maximum.
Further, the increase in the thickness of the limiter fuse causes a concern that the mounting state may be hindered. However, the fuse holder to which the limiter fuse is attached has a sufficient tolerance in the distance dimension, and there is no problem.

DESCRIPTION OF SYMBOLS 1 Good conductor metal thin plate 2 Conductive reinforcing metal plate 3 Conductive reinforcing metal plate 4 First heat resistant insulating plate 5 Heat resistant insulating transparent plate 6 Second heat resistant insulating plate 7 E-shaped sandwiching plate 8 Caulking metal fitting

Claims (1)

Both terminals have a groove width notch, a projecting part left on both sides of the center part so as to oppose the long side of the deformed T shape, and a pair of E-shaped sandwiching plates that close the protruding part between the two terminals A good conductor metal thin plate with a fusible part at the center formed by integral pressing, and a conductive reinforcing metal plate without the fusible part of the same shape as the groove width notch of the two terminals are overlapped, and this is the first heat resistant insulation In the limiter fuse in which the plate, heat-resistant insulating transparent plate, and second heat-resistant insulating plate are stacked one after the other and then fixed by caulking fittings, the volume of the shut-off chamber that becomes the space for storing the fusible part is expanded. Thus, by increasing the thickness of the second heat-resistant insulating plate in contact with the fusible part, the rated voltage value can be increased to a voltage value at least twice as high as the limiter fuse.

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