JPH0436916A - Gas blast circuit breaker - Google Patents

Abstract

PURPOSE:To allow the arc extinguishing gas to blow in the direction perpendicular to the arc axis and the nozzle direction by the double flow system and thereby enhance the large current breaking performance by furnishing an exhaust flow path opening in blowing perpendicular to the arc axis as bored in the side wall of a nozzle etc. or a storage chamber in the neighborhood of a stationary contact piece, and opening it or closing with an exhaust guide which operates interlocking with a moving contact piece. CONSTITUTION:An arc 10 is generated between a stationary contact piece 3 and a moving contact piece 4, and the arc extinctive gas in a storage chamber 9 is heated by the energy of arc 10, and thus the pressure is boosted. At this time, the exhaust flow path opening 7 provided in the side wall of the storage chamber 9 is blocked with an exhaust guide 8, and a nozzle 5 also is shut by the moving contact piece 4, so that no gas stream will be produced. When the stationary contact piece 3 goes out of the nozzle 5, the high pressure gas in the storage chamber 9 begins flowing out in the nozzle flow applying direction. At the same time, the exhaust flow path opening 7 is put in communication to outside the storage chamber, so that the arc extinctive gas in the storage chamber 9 blows out also in the direction perpendicular to the arc axis to generate double flow. Because therein the exhaust path 6 opens in the side wall direction of storage chamber 9, the flow path resistance is very small to permit full exertion of the double flow effect.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power circuit breaker, and particularly to the structure of a self-blade arc-extinguishing double-flow one-way gas circuit breaker.

[Conventional technology]

FIG. 5 shows an embodiment of the prior art. The heat buffer cutoff section is located in the storage chamber 9. Fixed contact 3. It is composed of a movable contactor, a 4° nozzle 5, etc. With this structure, when an arc 10 is generated between the movable contact 4 and the fixed contact 3 due to the breaking operation, the arc-extinguishing scum in the retention chamber 9 is heated and the pressure increases, and the movable contact 4 is connected to the insulating plate. When the arc exits from the arc 11, the arc-extinguishing gas in the storage chamber 9 is blown from a direction substantially perpendicular to the arc.

[Problem to be solved by the invention]

In the above conventional technology, when the movable contact is pulled out from the insulating plate, high-pressure arc-extinguishing scum in the storage chamber is blown onto the arc from a vertical direction, and when the movable contact or nozzle is pulled out, Since the pressure of the arc-extinguishing gas in the storage chamber is low, the double flow effect that improves large current interrupting performance is not exhibited.

The purpose of the present invention is to solve the problems of the prior art and provide a gas circuit breaker with excellent large current interrupting performance by using a double-flow type that sprays arc-extinguishing gas in the nozzle direction and in the direction perpendicular to the arc axis. It is in.

[Means to solve the problem]

-1- In order to achieve the objective 1, the present invention provides blowing in the direction perpendicular to the arc axis by providing the 1-1 part between the exhaust flow paths in the storage chamber near the fixed contact or on the side wall of the nozzle, etc. It consists of a cass breaker that is opened and closed by an exhaust guide that works with a mover.

[Effect]

An exhaust flow path is provided so that the arc-extinguishing gas heated by the arc energy is blown in a direction perpendicular to the arc axis, and its opening is provided in the storage chamber near the fixed contact or on the side wall of the nozzle, etc., and interlocks with the mover. By opening and closing with a high air guide, gas is blown not only in the direction perpendicular to the arc axis but also in the direction of the nozzle, which fully demonstrates the double flow effect and improves large current interrupting performance.

[Example] An example of the present invention is shown in FIGS. 1 to 3. FIG. 1 shows the state when it is turned on. The interrupting part is the main fixed contact 1.
Main movable contact 2. Fixed contact 3゜iiJ moving contact 4
It consists of Zuru 5 and others.

The exhaust passage 6 is closed by exhaust guys 1-8.

FIG. 2 shows the state in the latter half of the shutoff operation. An arc 10 is generated between the fixed contact 3 and the movable contact 4, and the arc-extinguishing scum in the storage chamber 9 is heated by the energy of the arc 10.
Pressure increases. 1, the part 7 between the exhaust flow paths provided on the side wall of the storage chamber 9 is closed by the exhaust guide 8, and the nozzle 5 is also closed by the movable contact 4, so that the gas flow is Does not occur. FIG. 3 does not show the state in the latter half of the shutoff operation. When the fixed contact 4 is pulled out from the nozzle 5, the high pressure gas in the storage chamber 9 flows out in the flow direction of the nozzle.

At the same time, since the exhaust flow path gap 7 communicates with the outside of the storage chamber,
The arc-extinguishing gas in the storage chamber 9 also blows out in the direction perpendicular to the arc axis, resulting in a double flow. At this time, since the exhaust flow path 6 opens toward the side wall of the storage chamber 9, the flow path resistance is extremely small and the double flow effect can be exerted for one minute.

Figure 4 shows an insulating plate installed to prevent the high-temperature, arc-extinguishing gas exposed to the arc from being blown directly onto the arc.
), and blows high-pressure, low-temperature arc-extinguishing gas (in this example, the exhaust flow path opening 7 is opened and closed by the exhaust guide that works with the mover, creating a double flow effect. be able to fully demonstrate.

〔Effect of the invention〕

According to the present invention, a gas circuit breaker is provided which can sufficiently exhibit a double flow effect and has excellent large current interrupting performance compared to a gas circuit breaker that blows in a direction perpendicular to the arc axis without using an exhaust guide. be able to.

Furthermore, by concentrating heavy objects on the stator side, and reducing the weight of the mover side by using only the main movable contact, movable contact, exhaust guide, and electric field mitigation shield, the exhaust flow path resistance in the side wall direction is reduced. It is possible to reduce the operating force while significantly reducing the

[Brief explanation of drawings]

1 to 3 are cross-sectional views for explaining the operation of one embodiment of the present invention, FIG. 4 is a cross-sectional view of another embodiment of the present invention, and FIG. 5 is a cross-sectional view of a conventional example. 1 Main fixed contact, 2 - Main movable contact, 3 - Fixed contact, 4... Movable contact, 5 Nozzle, 6... Exhaust passage, 7 Exhaust passage opening, 8 - Exhaust guide, 9 storage chambers. Funeral map diagram

Claims (1)

[Claims] 1. In a gas circuit breaker that has means for extinguishing the arc by increasing the pressure of the arc-extinguishing gas through heating by arc energy and spraying the arc-extinguishing gas onto the arc, the nozzle is synchronized in the downstream direction and in the direction perpendicular to the arc axis. the arc-extinguishing gas is blown in a direction perpendicular to the arc axis; A gas circuit breaker characterized in that an opening is opened and closed by an exhaust guide that interlocks with a movable element.