KR20140043815A

KR20140043815A - Fuse

Info

Publication number: KR20140043815A
Application number: KR1020147004198A
Authority: KR
Inventors: 아사코 타카하시
Original assignee: 야자키 소교 가부시키가이샤
Priority date: 2011-08-08
Filing date: 2012-08-06
Publication date: 2014-04-10
Also published as: BR112014002360A2; WO2013021616A1; CN103718266B; JP2013037889A; KR101539726B1; CN103718266A; JP5764006B2

Abstract

The fuse 1A includes a wire 2; A heat spot portion (3) disposed on a portion of the wire (2) and having a cross-sectional area smaller than that of another portion of the wire (2); And a heat dissipation member 4 for heat dissipation, which is fixed to a portion of the electric wire 2 that is different from the heat spot portion 3.

Description

Fuse {FUSE}

The present invention relates to a fuse that melts when an overcurrent (current exceeding a rated value) is energized and cuts off electricity.

As a fuse of this type of conventional example, there is a one disclosed in Patent Document 1. As shown in FIG. 1, the conventional fuse 50 includes a bus bar 51 made of a conductive material and a low melting point metal 60. The bus bar 51 is made of copper. The bus bar 51 is provided with a narrow width portion 52 having a cross-sectional area smaller than that of other portions. The bus bar 51 is integrally provided with a crimping piece 53 and a pair of blocking sections 54. A low melting point metal (eg, tin) 60 is arranged to span over the narrow portion 52 by the crimping piece 53. The low melting point metal 60 is crimped and fixed to the bus bar 51 and welded to the bus bar 51. The pair of blocking portions 54 are arranged at intervals on both outer sides of the low melting point metal 60. The pair of blocking portions 54 blocks the molten low melting point metal 60 from flowing in a wide range.

In the above configuration, when the overcurrent is energized in the bus bar 51, the narrow portion 52 has a higher Joule calorific value than the other portion to melt the low melting point metal 60, and thus the low melting point metal 60 thus melted. Will diffuse into the busbar (copper) 51 to lower the melting point of copper. As a result, the narrow portion 52 is melted.

US 5,528,213 A

However, since the low-melting-point metal 60 of the bus bar 51 is used as the conventional fuse 50 described above, the material cost, processing cost, and installation cost for the low-melting point metal 60 are increased. Occurs. In addition, a facility for welding the low melting point metal 60 to weld the low melting point metal 60 to the bus bar 51 is required. Therefore, there is a problem that the cost increases.

The present invention is to solve this problem. It is an object of the present invention to provide a low cost fuse.

A fuse of the first embodiment of the present invention includes a wire; A heat spot portion disposed in a portion of the wire and having a cross-sectional area smaller than that of another portion of the wire; And a heat dissipation member for heat dissipation, which is fixed to a portion of the wire different from the heat spot portion.

Preferably, the heat spot portion is provided at the center portion of the wire, and the heat dissipation member is fixed to both sides of the heat spot portion of the wire.

The heat dissipation member may be a terminal. The heat dissipation member may include a terminal and a wire for heat dissipation.

By the fuse according to the first aspect of the present invention, desired melt-down characteristics can be realized in electric wires and inexpensive heat dissipation members, and therefore, the low melting point metal used in the conventional example is not used. Therefore, the material cost, processing cost, and equipment cost of the low melting point metal are not necessary, so that a low-cost fuse can be obtained.

1 is a perspective view of a fuse according to a conventional embodiment.
2 is a perspective view of a fuse according to the first embodiment.
3 shows a fuse according to the first embodiment, FIG. 3A is a plan view, FIG. 3B is a front view, and FIG. 3C is a side view.
4 is a perspective view of a heat spot portion formed by rolling the central portion of the electric wire in the fuse according to the first embodiment.
5 is a diagram showing melt-flow characteristic diagrams of various electric wires.
6 is a perspective view of a fuse according to the second embodiment.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)

2 to 5 show a first embodiment. As shown in Figs. 2 and 3, the fuse 1A according to the first embodiment is a wire tongue 2 and two circular crimp terminals 11, which are fixed by crimping on both ends of the wire 2, respectively. terminal).

The electric wire 2 is an interlocking wire prepared by twisting and tying a plurality of wires made of, for example, a conductive material. These wires 2 are set to have a predetermined length. In the center part of the electric wire 2, the heat spot part 3 which has a cross-sectional area smaller than the cross-sectional area of another part is provided. This heat spot part 3 is manufactured by rolling the center part of the electric wire 2. The heat radiating member 4 is being fixed to the both sides of the heat spot part 3 of the electric wire 2. Slice terminals are used as the heat dissipation members 4. This slice terminal is made of a material having high thermal conductivity. The portion where such a slice terminal is fixed has a large heat capacity and a large surface area.

Next, the manufacturing method of the fuse 1A which concerns on 1st Embodiment is demonstrated. The electric wire 2 manufactured by twisting the several wire | wire of a electrically conductive material is used. First, by using a rolling mill, the center part of the electric wire 2 is rolled and the heat spot part 3 which has a cross-sectional area smaller than the cross-sectional area of another part is produced (heat spot manufacturing process).

Next, as shown in FIG. 4, the circular crimp terminal 11 is crimped and fixed to both ends of the electric wire 2.

Next, as shown in FIG. 2, the slice terminal of the heat dissipation member 4 is crimped and fixed to both side portions of the heat spot portion 3 of the electric wire 2. This completes the manufacture of the fuse 1A. In addition, the whole outside of the electric wire 2 other than both ends may be covered with an insulating protective layer (not shown).

The melting characteristic of the fuse 1A manufactured in this way is as follows compared with the unprocessed electric wire W1 and the electric wire W2 which does not have the heat spot part 3. As the electric wire 2, what melt | dissolves the melt | dissolution characteristic in a local short circuit area | region (200% electricity supply) in the unprocessed state is used within the specification of ISO 8820. The blowdown characteristic line of this raw wire W1 is W1 of FIG. The electric wire W2 having only the heat dissipation member 4 without the heat spot portion 3 has a large surface area where air and the electric wire 2 contact each other at the portions where the heat dissipation members 4 are fixed. When heat rises, heat dissipation is large. Therefore, when compared with the raw wire W1, the melting time is delayed in the electric current conduction region of the overcurrent. The blowdown characteristic line of the electric wire W2 which has only the heat radiating member 4 is W2 of FIG. Therefore, in the dead short region (600% energization), the melting time of the wire W2 is within the specification, but in the dead short region (600% energization), the melting time of the wire W2 is longer than the specification.

The fuse 1A of the first embodiment has a larger caloric value in the heat spot portion 3 compared to the wire W2 having only the heat dissipation member 4, so that the blow time is shorter, especially in the dead short region (600% energization). You lose. The blowdown characteristic line of the fuse 1A is 1A of FIG. Therefore, the blow time of the fuse 1A in the dead short region (600% energization) is within the specification. The fuse 1A is capable of protecting the melt characteristic level 5 according to ISO 8820 without using a low melting point metal.

As described above, the fuse 1A of the first embodiment can realize the desired melting characteristics by using the electric wire 2 and the heat dissipation member 4 which is cheaper than the low melting point metal, and thus the low melting point used in the conventional example. Do not use metal. Therefore, the fuse 1A of the first embodiment does not require material cost, processing cost, and installation cost of the low melting point metal, and thus is inexpensive.

The heat spot part 3 is provided in the center of the electric wire 2, and the heat radiating member 4 is provided in the both ends of the heat spot part 3 of the electric wire 2, respectively. Both outer portions of the heat spot portion 3 can be reliably melted in the heat spot portion 3 because the rise in temperature is suppressed by heat dissipation.

Each of the heat radiating members 4 uses a splice terminal. Such splice terminals are inexpensive and readily available, and can be easily fixed to the electric wire 2.

(Second Embodiment)

6 shows a second embodiment of the present invention. As shown in FIG. 6, compared with the fuse 1A of the first embodiment, the fuse 1B of the second embodiment has a different structure of the heat radiating member 4A. That is, the splice terminal 4a and the heat radiation wire 4b are used as each heat radiation member 4A. One end of the heat dissipation wire 4b is crimped together with the wire 2 by the splice terminal 4a.

Since the other structure of the fuse 1B of 2nd Embodiment is substantially the same as the fuse 1A of 1st Embodiment, the same structural part is used for the same structural part in the figure, and the description is abbreviate | omitted.

Like the fuse 1A of the first embodiment, the fuse 1B of the second embodiment can realize the desired blow-out characteristics by using the wire 2 and the heat dissipation member 4A, so that the low fuse used in the conventional example is used. No melting point metal is used. Therefore, the fuse 1B of the second embodiment is inexpensive because the material cost, processing cost and installation cost of the low melting point metal are not required.

Since each of the heat radiating members 4A uses the splice terminal 4a and the heat radiating wire 4b by the fuse 1B of 2nd Embodiment, not only the splice terminal 4a but also the heat radiating wire 4b It may radiate heat from the surface. Therefore, the fuse 1B of the second embodiment has better heat dissipation characteristics than the fuse 1A of the first embodiment. The splice terminal 4a and the heat dissipation wire 4b are each inexpensive and easily available. In addition, the splice terminal 4a and the heat dissipation wire 4b are combination parts which can be easily fixed to the wire 2.

Claims

As a fuse,
wire;
A heat spot portion disposed in a portion of the wire and having a cross-sectional area smaller than that of another portion of the wire; And
And a heat dissipation member for heat dissipation, which is fixed to a portion of the wire different from the heat spot portion.

The method of claim 1, wherein the heat spot is provided in the center of the wire,
And the heat dissipation members are fixed to both sides of the heat spot of the electric wire.

The fuse according to claim 1, wherein the heat dissipation member is a terminal.

The fuse of claim 1, wherein the heat dissipation member comprises a terminal and a wire for heat dissipation.