JP2002352692A - Breaker for wiring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the reverse flow amount of a discharge gas to an arc- extinguishing chamber and thereby to enhance its exhaust efficiency. SOLUTION: An instant trip device 5 is mounted in a case 4, and an exhaust port 13 of the discharge gas is bored in the side face of the case 4. An exhaust air passage 7 is formed between the exhaust port 13 and a contact 6, and the arc-extinguishing chamber 2 is installed in an intermediate part of the exhaust air passage 7. A rib 3 for leading the discharge gas toward the exhaust port 13 is formed at the exit of the arc-extinguishing chamber 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker having an arc extinguishing chamber.

[0002]

2. Description of the Related Art As shown in FIG. 2, a conventional device 5 for instantaneously tripping by the electromagnetic force of a coil 8 when a large instantaneous current flows, and an arc extinction for flowing an arc generated at a contact 6 and a discharge gas. A circuit breaker 100 having a chamber 2 and a case 4 in a case 4 is known. The arc-extinguishing chamber 2 is formed of a relatively large box, and is arranged in the exhaust passage 7. The exhaust passage 7 is defined inside the case 4 by a partition 16, and the partition 16 is provided with an inclined portion 16 a for guiding the discharge gas that has passed through the arc-extinguishing chamber 2 to the outlet 13.

[0003]

However, according to the conventional circuit breaker 100 for wiring, as shown by a two-dot chain line in FIG.
At the outlet of the arc-extinguishing chamber 2, the discharge gas hits the inclined portion 16 a of the partition 16, and a part thereof flows backward into the arc-extinguishing chamber 2, so that the discharge gas discharge efficiency is reduced. Also,
The discharge gas retained in the arc-extinguishing chamber 2 prevents the arc from flowing,
There was a possibility that the arc-extinguishing effect was adversely affected.

In view of these problems, an object of the present invention is to provide a circuit breaker for wiring that can reduce the reverse flow rate of a discharge gas to an arc-extinguishing chamber and increase the discharge efficiency.

[0005]

According to a first aspect of the present invention, there is provided a circuit breaker for wiring, wherein a discharge gas discharge port is provided in a case, an exhaust path is formed between the discharge port and a contact, and a discharge gas path is formed in the middle of the exhaust path. In a circuit breaker provided with an arc-extinguishing chamber, a rib is provided in or near the arc-extinguishing chamber to guide a discharge gas toward an outlet.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing one embodiment of a circuit breaker according to the present invention. Circuit breaker for main wiring 1
In, the instantaneous trip device 5 is installed inside the case 4, and the operation handle 9 is protruded outside the case 4. The instantaneous trip device 5 is provided with a coil 8 connected to the load connection terminal 10 and a link-type trip mechanism 14 that opens the contact 6 when a large instantaneous current flows.

A discharge gas outlet 13 is provided on the side of the case 4.
The exhaust passage 7 is formed between the discharge port 13 and the contact 6, and the arc-extinguishing chamber 2 is provided in the exhaust passage 7. The exhaust passage 7 is defined inside the case 4 by a partition 16, and the partition 16 is provided with an inclined portion 16 a for guiding the discharge gas passing through the arc-extinguishing chamber 2 to the outlet 13.
The arc-extinguishing chamber 2 is formed of a box having substantially the same size as the cross-sectional area of the exhaust passage 7. At the outlet of the arc-extinguishing chamber 2, a rib 3 for guiding the discharge gas toward the discharge port 13 is provided obliquely along the inclined portion 16a.

In the circuit breaker 1 having the above-described structure, the arc ignited at the contact 6 flows into the arc-extinguishing chamber 2 along the arc traveling plate 12 as shown by a dashed line in FIG. Will disappear later. The discharge gas generated at the same time passes through the arc-extinguishing chamber 2 and is guided to the discharge port 13 along the inclined portion 16a by the rib 3 at the outlet of the arc-extinguishing chamber 2 as shown by a two-dot chain line in the figure. It is discharged smoothly from the discharge port 13.

Therefore, according to the circuit breaker of this embodiment, the reverse flow rate of the discharge gas into the arc-extinguishing chamber 2 is reduced,
The discharge efficiency of the discharge gas can be increased. Further, since the arc quickly flows into the arc-extinguishing chamber 2 without being hindered by the discharge gas, the arc-extinguishing action here can be promoted, and the short-circuit breaking performance can be positively affected.

The present invention is not limited to the above-described embodiment. For example, a plurality of ribs may be provided in the arc-extinguishing chamber, ribs may be provided near the arc-extinguishing chamber, or the shape of the partition may be changed. However, the shape and configuration of each part can be appropriately changed without departing from the spirit of the present invention.

[0011]

As described above in detail, according to the first aspect of the present invention, the rib for guiding the discharge gas to the discharge port is provided in or near the arc-extinguishing chamber. The reverse flow rate can be reduced to increase the discharge efficiency.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of an embodiment of a circuit breaker according to the present invention.

FIG. 2 is a cross-sectional view of a conventional circuit breaker for wiring.

[Explanation of symbols]

1. Circuit breaker for wiring, 2. Arc extinguishing chamber, 3. Rib, 4.
· Case, 6 · · · contacts, 7 · · · exhaust passage, 13 · · · outlet.

Claims (1)

[Claims] In a circuit breaker for wiring, wherein a discharge gas discharge port is provided in a case, an exhaust passage is formed between the discharge port and a contact, and an arc extinguishing chamber is provided in the exhaust passage. A circuit breaker for wiring, wherein a rib for guiding discharge gas to an outlet side is provided in the vicinity thereof.