JPH0448577Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to an arc extinguishing device for a circuit breaker, and in particular to improving the arc extinguishing performance of a circuit breaker.

BACKGROUND ART Conventionally, as shown in FIG. 2 of the drawings, an arc extinguishing device for a circuit breaker of this type has a notch 22 approximately in the center and mounting protrusions 24 on both left and right edges. A plurality of metal arc extinguishing plates 21 having
A pair of support plates 25 made of an insulating material that fit the mounting protrusions 24 of the plurality of metal arc-extinguishing plates 21 into holes and support the arc-extinguishing plates 21 by caulking them from both sides at a predetermined interval. It is composed of.

Problems to be Solved by the Invention Generally, in this type of circuit breaker arc extinguishing device, the notch 22 of the arc extinguishing plate 21 is damaged by the action of the magnetic field caused by the arc generated between the contacts and the metal arc extinguishing plate. This device attracts an arc to the head and breaks the arc with the arc extinguishing plate 21, leading to cooling and extinguishing, but the rated voltage is
If the voltage is 600V or the breaking current is large, the insulation performance of the arc extinguishing device may deteriorate, or the notch 2 of the arc extinguishing plate 21 may
There was a drawback that the legs 23 on both sides of 2 were consumed by the arc, and the arc was continued by the arc gas mixed with melted metal ions, resulting in extremely poor arc extinguishing performance.

Therefore, the main purpose of this invention is to provide an arc extinguishing device for a circuit breaker that has improved insulation performance and arc extinguishing performance in this type of arc extinguishing device with a simple configuration.

Means for Solving the Problems The arc extinguishing device for a circuit breaker according to this invention consists of a plurality of arc extinguishing plates each having a notch in the center thereof, and a plurality of arc extinguishing plates provided on both sides of the arc extinguishing plates. A support plate made of an insulating material that supports the plurality of arc-extinguishing plates at a predetermined interval by fitting the mounting protrusions into the holes, and an arc-extinguishing plate leg having a plurality of protruding fins integrally molded on the board from silicone rubber. The base plate of the arc-extinguishing plate leg separator is sandwiched between the arc-extinguishing plate and the support plate made of an insulating material, and the fins are inserted into the gaps between the plurality of arc-extinguishing plate leg parts. It is something.

Function: Therefore, based on the above-mentioned means of this invention, insulation performance can be improved without increasing the size of the conventional device by adding an arc-extinguishing plate leg separator made of silicone rubber to the arc-extinguishing device of a circuit breaker. You can increase it to prevent arc continuation.

Embodiment FIG. 1 of the drawings shows an embodiment of the arc extinguishing device for a circuit breaker according to the present invention. A plurality of arc-extinguishing plates 1 made of metal plates having a notch 2 in the center, legs 3 on both sides of the notch 2, and attachment protrusions 4 on both side edges.
A pair of supporting plates 5 made of an insulating material are provided with holes 6 into which the mounting protrusions 4 of the arc extinguishing plate 1 are fitted in order to attach and support the arc extinguishing plate 1 from both sides at a predetermined interval; It is mainly composed of arc extinguishing plate leg separators 7 made of silicone rubber provided on both legs of the arc plate 1, respectively.

In particular, the arc extinguishing plate leg separator 7 made of silicone rubber in the arc extinguishing device for a circuit breaker of this invention is formed by integrally molding a plurality of protruding fins 9 on a thin substrate 8 at predetermined intervals. .

The arc extinguishing plate leg separators 7 of the arc extinguishing device of the circuit breaker of this invention are arranged on both legs of a plurality of arc extinguishing plates 1 when assembling the arc extinguishing device using an assembly jig. The board 8 portion is held between the plurality of arc-extinguishing plates 1 and the support plate 5 made of insulating material, and the plurality of protruding fins 9 are attached to the legs of the plurality of arc-extinguishing plates 1. The arc extinguishing device is assembled integrally by crimping the mounting protrusions 4 of the plurality of arc extinguishing plates 1 onto the support plate 5 made of an insulating material.

According to the circuit breaker arc extinguishing device of this invention configured as described above, the legs of the arc extinguishing plate 1 are prevented from being worn out when a large current is cut off, and the elution of metal ions, which is a cause of subsequent arcs, is reduced. The arc extinguishing performance is improved, and the damage caused by the high temperature arc generated at the arc extinguishing plate legs of the insulating support plate 5 is reduced, thereby improving the insulation performance.

Effects of the invention As described above, according to this invention, an arc extinguishing plate leg separator having a protruding fin made of silicone rubber is added to the conventional arc extinguishing device with a simple structure, thereby improving the conventional arc extinguishing device. Effects such as improved insulation performance and arc extinguishing performance can be achieved without increasing the size.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing an embodiment of the arc extinguishing device for a circuit breaker of this invention, and FIG. 2 is a perspective view of a conventional arc extinguishing device for a circuit breaker. In the figure, 1, 21... Arc-extinguishing plate, 2, 22... Notch, 3, 23... Leg, 4, 24... Mounting protrusion, 5, 25... Support plate made of insulating material. , 6...
Hole, 7... Arc-extinguishing plate leg separator made of silicone rubber, 8... Substrate, 9... Projecting fin.

Claims (1)

[Scope of utility model registration request] A plurality of metal arc-extinguishing plates having legs formed on both sides of a notch in the substantially central portion and mounting protrusions on both side edges, and mounting protrusions of the plurality of arc-extinguishing plates. The arc-extinguishing plate is composed of a support plate made of an insulating material that is fitted into a hole and mounted and supported at intervals, and an arc-extinguishing plate leg separator that has a plurality of protruding fins integrally formed on the base plate from silicone rubber. An arc extinguishing device for a circuit breaker, wherein a base plate of a leg separator is held between the arc extinguishing plate and an insulating support plate, and fins are inserted into gaps between a plurality of arc extinguishing plate legs.