JPS5856932B2 - switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is intended to improve the performance of a switch and to obtain an arc extinguishing chamber with higher picture receiving and interrupting ability.

The gas switch will be explained below for convenience.

Generally, a gas switch uses some method to generate a pressure difference in gas and blows it onto the arc to be extinguished, thereby cutting off the current.

However, when an arc occurs, arc internal pressure is generated due to thermal dissociation or electrolysis of the arc, causing a blockage phenomenon that stops the generation of gas flow, resulting in failure to shut off.

The present invention focuses on a method of releasing pressure from an arc chamber by utilizing a blockage phenomenon, and aims to obtain an image receiving breaker with a simple structure.

An embodiment of the invention will be described with reference to FIG.

FIG. 1 shows a case where the breaker is in a closed energized state.

As shown in the figure, when the movable contact 2 moves in the direction shown by the arrow 3 from the state where the movable contact 2 is inserted into the fixed contact 1, the contact 1.2 opens and an arc is generated. The pressure inside is due to the thermal dissociation of the arc,
Due to decomposition and expansion, it propagates and rises at high speed, increasing pressure.
The arc chamber 5 is also pressurized through the nozzle section 9.

The temperature of the high-pressure fluid in the pressurization chamber 4 button and the arc chamber 5 propagates by convection and diffusion, so the propagation speed is slow and does not become very high during the short time until the pressurization chamber 4 opens to the arc 6.

When the movable contact 2 further moves downward and the pressurizing chamber 4 opens into the arc chamber 6, the high-pressure fluid in the arc chamber 4 passes through the arc space as the current converges to zero, forming an arc containing low-pressure, low-temperature fluid. When flowing into the chamber 6, the arced gas is cooled and diffused to extinguish the arc.

The arc chamber 6 has a volume that allows the high pressure fluid in the pressurization chamber 4 to flow out into the arc chamber 6 for a suitable period of time required for interruption.

Furthermore, when the arc chambers 5 and 7 are cut off under severe circuit conditions with a high rate of increase in re-EMF voltage, and the arc time becomes longer, the arc chambers 5 and 7 are internally closed as the pressure rises before the nozzle 9 opens through the exhaust port 8 due to the arc pressure. The high pressure fluid is cooled and deionized.

In this state, when the nozzle part 9 first opens in the arc chamber 5, high-pressure fluid, which is different from the new fluid in the arc chamber 5, acts on the arc, and as the current converges to zero, it passes through the nozzle part 9 and the exhaust port 8 to the surrounding area. Room 11 Vent the air into the room.

At this time, the fluid in the pressurizing chamber 4 and the arc chambers 5 and 6 serves as a fluid supply source to the nozzle section 9.

Even when the nozzle portion 9 is open to the arc chamber 7, the same effect as described above is obtained, and even when the arc time becomes longer, the arc extinguishing force continues to be strengthened.

The arc chambers 5, 7 can be further increased as required, and it is effective to arrange the exhaust ports 8 in the axial direction accordingly.

When the button configured as described above is pressed, a small needle command is given to an operating device (not shown), and in conjunction with this, the movable contact 2 descends and performs an appropriate wiping motion, and contacts 1 and 2 are opened. to generate an arc.

This arc A then commutates between the arc contact 10 and the movable contact 2.

(See FIG. 1) This arc increases the pressure in the valve pressure chamber 4 and the arc chamber 5 to a value necessary for shutoff until the nozzle portion 9 opens into the arc chamber 6.

Next, the nozzle part 9 enters the arc chamber 6 and opens the booster chamber 4 to the arc chamber 6, and as the current converges to zero, the high pressure arc-extinguishing fluid in the booster chamber 4 is released into the arc chamber 6, and the arc is extinguished. do.

(See FIG. 2) Under severe conditions where the arc becomes longer, the pressure in the arc chambers 5 and 7 is increased by the downward movement of the movable contact 2.

Since the pressure inside the arc chamber 7 has a characteristic of increasing with the length of the arc, it is increased to a value higher than the pressure inside the arc chamber 5 and is waiting for the nozzle part 9 to open.

(See Fig. 3) After that, the exhaust port 8 opens into the peripheral chamber 11, and as the current converges to zero, the pressure in the boosting chamber 4 and the arc chamber 6 is released through the nozzle part 9, and then the arc chamber 5,
At this time, the arc chambers 5 and 7 are sequentially opened to the arc space.
The low-temperature, high-pressure fluid inside the nozzle portion 9 sufficiently tightens the arc so that the current reaches zero and quickly extinguishes the arc.

Note that the arrows in the figure indicate the flow of the arc-extinguishing fluid.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, and are sectional views of essential parts during operation. The same buttons and symbols in the figures indicate the same parts. In the figure, 1 is a fixed contact, 2 is a movable contact, 4 is a boosting chamber, 5 to 7 are arc chambers, 8 is an exhaust port, and 9 is a nozzle section.

Claims (1)

[Claims] 1 Fixed contact arranged at one side opening of the pressurization chamber,
A movable contact that is formed in a hollow shape and has an exhaust port on the side and that moves toward and away from the fixed contact as the movable contact is opened and closed; and a movable contact that surrounds the movable contact and is arranged in parallel in the direction that moves toward and away from the movable contact. A switch comprising a plurality of arc chambers that are sequentially communicated with the pressurizing chamber through the exhaust port as the switch moves.