JP2003007192A - Reinforcing structure of quick fusing thermal fuse - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcing structure of a quick fusing thermal fuse used on a rotating apparatus enabling prevention of deformation or destruction of a fuse element under a strong centrifugal force by reinforcing the fuse element itself. SOLUTION: The quick fusing thermal fuse has the structure reinforcing the fuse element 3, which is disposed between the fuse element 3 and terminals 1. The fuse element 3 is hold between a pair of reinforcing cross-shaped supporters 8 having center holes, and long bars of the crosses suppress distance changing between the terminals 1 and 1, wherein the supporters 8 have heat- resisting and insulating properties.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing structure for a fast-acting fuse in a rotating machine. For example, the present invention relates to a reinforcing structure for preventing a quick-acting fuse mounted on a rotating part such as a generator from being damaged.

[0002]

2. Description of the Related Art Conventionally, in a fast-acting fuse mounted on a rotating portion such as a generator, a thin silver plate having a narrow narrow portion has been used as a fuse element used therein (Japanese Patent Laid-Open Publication No. Sho. 60-77334). The narrow part of this silver plate is tentatively held by a pair of rectangular reinforcing plates made of heat-resistant melamine resin laminated plate from both sides, and fixed by soldering to the terminals (several plate distribution depending on the rated current). Then, the surrounding area is buried with an arc-extinguishing agent made of silica sand, and when an excessive current flows, the narrow part of the silver plate is melted in a very fast time to protect the semiconductor element and the like.

[0003]

However, although it is premised that such a fast-acting fuse is mounted on a rotating body such as a generator, the higher the centrifugal force generated by the number of revolutions becomes, the more the G becomes. The value of becomes large, and it becomes impossible to endure this, and mechanical disconnection occurs. On the other hand, as is well known, the fuse element is made of a material that easily breaks, and has a thin narrow portion, so that the fuse element itself is weak in strength.

Therefore, when the above-mentioned centrifugal force due to high-speed rotation is applied to the fuse element, stress is particularly generated at the joints between the terminals at both ends of the fuse element and the fuses are deformed or the center of the fuse element is narrowed. However, there is a problem that it may spread to the part and bend or break. In addition, the reinforcing plate made of a rectangular melamine resin laminated plate holding the narrow portion of the fuse element,
As shown in the conventional product in Table 1, since the fuse element is fixed vertically to the centrifugal force direction, it is easy to move in the longitudinal direction of the fuse body, that is, in the centrifugal force direction, and therefore the position of the fuse element changes with time. There is a problem in that the displacement occurs, the narrow portion of the fuse element is bent, and the damage progresses.

The present invention has been made in view of the above problems in the prior art, and its purpose is to reinforce the fuse element itself so that the fuse element is deformed even when a large centrifugal force is applied. Another object of the present invention is to provide a reinforcing structure for a quick-acting fuse in a rotating part that is not likely to be damaged.

[0006]

A reinforcing structure for a fast-acting fuse according to claim 1 of the present invention that achieves the above object is a reinforcing structure for a fast-acting fuse connected between a fuse element and a terminal, And the insulating property, and the fuse element is sandwiched and fixed from both sides by a pair of reinforcing supports having an opening at the center thereof, and the fuse element sandwiched and fixed by the reinforcing supports is not moved to the terminal. It is fixed as follows. The reinforcing structure for a fast-acting fuse according to claim 2 of the present invention that achieves the above object is the claim 1 according to claim 1, wherein the reinforcing support is formed in a cross shape, and the cross direction of the cross shape moves between terminals. The feature is that the direction is set to stop.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The reinforcing support according to the present invention is, for example, formed in a cross shape having an opening in the center thereof, and therefore is fixed from both sides centering on the central narrow portion of the ribbon-shaped fuse element. can do. Therefore, even if the fuse element provided between the terminals receives an excessive centrifugal force, the longitudinal end of the cross-shaped reinforcing support provided between the terminals can receive the centrifugal force. As a result,
No large stress is applied to the fuse element, so that the deformation or damage of the fuse element is prevented. Furthermore, as a reinforcing support,
The use of a cross shape has an advantage in heat dissipation that allows the heat of the fuse element to easily escape, and has an advantage that the material can be reduced as compared with the rectangular shape. Further, the reinforcing structure of the fast-acting fuse of the present invention has a small number of parts and is easy to manufacture and assemble.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment embodying the present invention will be described in detail below with reference to FIGS. FIG. 1 is a longitudinal sectional view showing a reinforcing structure of a fast-acting fuse according to an embodiment of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a perspective view of a reinforcing support thereof. In the fast-acting fuse according to this embodiment,
The fuse element 3 is held from both sides by a pair of reinforcing supports 8 and fixed by an eyelet 11.

The reinforcing support 8 is made of a cross-shaped melamine resin, and has sufficient strength for protecting the fuse element 3 and can withstand a high temperature of 200 ° C. or higher. The reinforcing support 8 exposes the narrow portion 3a of the fuse element 3 in the central opening portion 8a, and when the narrow portion 3a is melted, the welding arc emitted from the opening portion 8a is dissipated to the surrounding arc extinguishing agent 4. Therefore, it has a structure that cuts off the connection of the electric circuit by the arc.

In order to fix the fuse element 3 held by the pair of reinforcing supports 8 to the terminal 1, the left and right end portions 3b and 3c of the fuse element 3 are placed at predetermined positions in the groove portion (not shown) of the terminal 1. The solder 10 is poured in a state of being slid to the above and melt-bonded. In this state, a tube 2 made of a laminated tube of heat-resistant melamine resin is inserted from one terminal 1 to cover it from the outside, and a plurality of copper rivets 5 are radially driven to bond and fix the tube 2 and the terminal 1. . And
The arc-extinguishing agent 4 such as silica sand is inserted into the cylinder 2 from the opening 1a of the other terminal 1.
Fill inside and fix with brass screws 7.

Conventionally, there has been a concern that stress is directly applied to the narrow portion 3a of the fuse element 3 in this step, and this portion is partially bent or deformed, but in this embodiment, the cross-shaped reinforcing support is provided. The terminal 1 is located at the longitudinal end portion 8c of the body 8.
Relative movements will be accepted by the spaces and no such concern will arise. From this, the narrow portion 3a of the fuse element 3
Since no stress is applied to the device, it is not bent or deformed, and extremely stable work can be performed in the assembly process.

As described above, in this embodiment, since the fuse terminal 3 is perfectly reinforced by the cross-shaped reinforcing support 8, there is no fear of deformation or damage even if an excessive centrifugal force is applied. Has the effect. That is, according to the present embodiment, even if the distance between the fuse elements 3 changes due to an excessive centrifugal force, the centrifugal force is received by the cross-shaped reinforcing support body 8, and therefore the narrow portion of the fuse element 3 is prevented. It has an excellent effect that it is not deformed or damaged. In addition, using the conventional product and this embodiment,
Table 1 shows data obtained by actually mounting the rotor on the generator and comparing the tests.

[0013]

[Table 1] Comparison data from high-speed rotation test

As shown in Table 1, the sample N of the conventional product
o. In all of Nos. 1 to 3, the narrow portion of the fuse element was deformed into a "<" shape, while the sample No. 1 according to the present example.
No evidence of deformation was found in any of 1'to 3 '.

[0015]

As described above in detail with reference to the embodiments, according to the present invention, even if the distance between the fuse element and the fuse element changes, the force is received by the cross-shaped reinforcing support. Therefore, there is an excellent effect that the narrow portion of the fuse element is not likely to be deformed or damaged. Further, when the cross-shaped support is used as the reinforcing support, there is an advantage in heat dissipation that the heat of the fuse element is easily released, and there is also an advantage that the material can be reduced as compared with the rectangular support. Further, the reinforcing structure of the fast-acting fuse of the present invention has a small number of parts and is easy to manufacture and assemble.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view taken along the line AA ′ in FIG. 2, showing a reinforcing structure of a fast-acting fuse according to an embodiment of the present invention.

FIG. 2 is a front view showing a reinforcing structure for a fast-acting fuse according to an embodiment of the present invention.

FIG. 3 is a perspective view of a reinforcing support of a fast-acting fuse according to an exemplary embodiment of the present invention.

[Explanation of symbols]

1 terminal 2 tubes 3 fuse element 4 Arc-extinguishing agent 5 rivets 7 screws 8 Reinforcement support 10 Solder 11 Eyelet 0

Claims (2)

[Claims] 1. A reinforcing structure for a quick-acting fuse connected between a fuse element and a terminal, the fuse element comprising a pair of reinforcing supports having heat resistance and insulating properties and having an opening portion in the center thereof. A reinforced structure for a fast-acting fuse, wherein the fuse element is clamped from both sides, and the fuse element clamped and fixed by the reinforcing support is fixed so as not to move to the terminal. 2. The reinforcing structure for a fast-acting fuse according to claim 1, wherein the reinforcing support is formed in a cross shape, and a longitudinal direction of the cross shape is a direction to prevent movement between terminals.