JPH01313829A - Buffer type gas-blast circuit-breaker - Google Patents

Abstract

PURPOSE:To prevent a control rod from being damaged due to the effect of a high temperature gas by arranging a metal having resistance against are inside the rod and up to the position of a hole from a nozzle. CONSTITUTION:A communication hole 5a of a control rod 5 is formed so as to communicate with the inside of a buffer chamber 11 at the initial stage of breaking operation, in a movable contact member 2. This hole 5a is also constructed such that it communicates a hollow part of the rod 5 with a circumferential gas space at the late stage of breaking operation when it passes through the inner dia. end part of a buffer piston 7. At an inner face through which high temp. gas passes in the rod 5, a metal 12 with resistance against arc is arranged, while the rod and the metal are supported and fixed by means of rivet 13 and the like. Even if gas flow once sprayed out at the initial stage of open state flows into the chamber 11 from the hole 5a, in breaking a large current, it is possible to prevent the inner wall from being damaged due to high temp. gas.

Description

[Detailed description of the invention] [Object of the invention] (Industrial application field) The present invention is a puffer-type gas interrupter that compresses gas by the movement of a moving part when interrupting current, and creates a gas flow to cool and interrupt the arc. This invention relates to an improved structure of the operating rod part.

(Prior Art) In a puffer type gas circuit breaker, it is necessary to increase the pressure when blowing to improve the circuit breaking performance.

For this reason, a puffer-type gas circuit breaker was devised as shown in FIG. 4 and is known from Japanese Patent Laid-Open No. 62-276717. This circuit breaker allows the thermal energy of the arc to flow into the puffer chamber, thereby increasing the pressure within the puffer chamber, and as a result, the pressure is increased by the blowing.

(Problem to be Solved by the Invention) In the large current breaking operation of such a circuit breaker, at the initial stage of opening, -
In this method, the gas flow that has been blown out once again flows into the puffer chamber 11 through the communication hole 5a of the operating rod, is compressed again, and is blown out.

During the operation, the high-temperature gas flowing into the puffer chamber 11 may come into contact with the inner wall surface of the operating rod 5 and damage the inner wall surface. In particular, damage to the inner wall of the operating rod 5 other than the communicating hole 5a was greater than other parts. Recently, in order to improve the performance of circuit breakers, methods have been developed to reduce the weight of moving parts in order to increase the opening speed. As one method for this purpose, in order to reduce the weight of the operating rod 5, one made of aluminum alloy has been used instead of the conventional iron material. However, in such aluminum alloy materials, the inner wall of the operating rod is seriously damaged by the aforementioned high-temperature gas and may break around the communication hole of the operating rod, which interrupts the large current dozens of times.

In the figure, 1 is a fixed contact part and 2 is a movable contact part.

3 is a fixed current-carrying contact, 4 is a fixed arc contact, 6 is a puffer cylinder, 7 is a puffer piston, 8 is a movable arc contact, 9 is a movable current-carrying contact, 1O is an insulating nozzle, 11
is the puffer room.

The present invention was made to eliminate the above problems, and
The purpose of the present invention is to provide a highly reliable puffer type gas circuit breaker that prevents damage to the operating rod.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, in the present invention, arc-resistant metal is arranged inside the operating rod and from the nozzle to the hole.

(Function) With this configuration, it is possible to prevent the high-temperature gas that passes through when shutting off from directly acting on the inner wall of the operating rod, and it is possible to prevent damage to the operating rod.

(Example) Fig. 1 shows the structure of a puffer type gas circuit breaker according to an embodiment of the present invention. Fig. 0 shows only the interrupting part and does not show the driving device part, and shows the same parts as Fig. 4. are given the same reference numerals and detailed explanation will be omitted.

In the figure, reference numeral 1 denotes a fixed contact portion, which is composed of a fixed single contact 4 and a fixed current-carrying contact 3. 2 is a movable contactor section, which includes an operating rod 5, a puffer cylinder 6,
Movable arc contact 8. Movable current-carrying contact 9, insulating nozzle l
O is fixed.

In the movable contact portion 2, the puffer cylinder 6 and the puffer piston 7 form a puffer chamber 11.

In addition, in the movable contact portion 2, the communication hole 5 of the operating rod 5
In a, the communication hole 5a is machined so as to communicate with the inside of the puffer chamber 11 at the initial stage of the shutoff operation. This communication hole 5a is formed during the latter half of the blocking operation.

When it passes the inner diameter end 7a of the puffer piston 7.

The hollow portion of the operating rod 5 is configured to communicate with the surrounding gas space. Here, the details of the 5th part of the operation condo are explained in the second part.
An arc-resistant metal 12 is disposed on the inner surface of the operating rod 5 shown in FIGS. 3 and 3, through which high-temperature gas passes. The operating rod 5 and the arc-resistant metal 12 are supported and fixed with rivets 13 or the like.

When cutting off a large current, the gas flow once blown out at the initial stage of opening flows into the puffer chamber 11 from 58 of the operating rod 5. In this case, the inner wall of the operating rod 5 has arc-resistant metal 1
2, the inner wall will not be damaged by high temperature gas.

〔Effect of the invention〕

As explained above, in the present invention, arc-resistant metal is placed inside the operating rod and from the nozzle to the hole position, so that the operating rod is not damaged by high-temperature gas and can be used as a highly reliable puffer-type gas. A circuit breaker can be provided.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the shutoff part of a puffer-type gas circuit breaker showing an embodiment of the present invention, FIG. 2 is a cross-sectional view of the operation lead part shown in FIG. 1, and FIG. FIG. 4 is a partially cross-sectional perspective view of the rod portion, and FIG. 4 is a cross-sectional view showing the interrupting portion of a conventional puffer type gas circuit breaker. 1... Fixed contact part, 2... Movable contact part, 3
...Fixed current-carrying contact, 4...Fixed arc contact,
5... Operating rod, 5a... Communication hole. 6... Puffer cylinder, 7... Puffer piston 8... Movable arc contact, 9... Movable energizing contact,
10... Insulating nozzle, 11... Puffer chamber,
12... Arc-resistant metal, 13... Rivet. Agent Patent Attorney Nori Ken Ken Daikomaru Figure No. 21!1

Claims (1)

[Claims] A container filled with arc-extinguishing gas has a fixed contact part that can be moved in and out and a movable contact part, and compresses a puffer chamber consisting of a puffer piston and a puffer cylinder provided in the movable contact part. By compressing the gas and guiding it to the nozzle part, the arc generated between the fixed and movable arc contacts is cooled and extinguished, and a hole is provided in the hollow part of the operating rod that drives the puffer cylinder to perform the breaking operation. A puffer-type gas circuit breaker configured such that the hollow part of the operating rod and the puffer chamber are communicated through the hole at an initial stage, and the hollow part of the operating rod and the container are communicated through the hole at a later stage of the shutoff operation. A puffer-type gas circuit breaker, characterized in that an arc-resistant metal is arranged inside the operating rod and from the nozzle side to the position of the hole.