JPS587564Y2 - gasshiyadanki - Google Patents

Description

[Detailed description of the invention] This invention consists of a movable contact having a disk shape, and an arc generated between the movable contact and an arc runner provided opposite to the contact, which rotates around the center of the contact. The present invention relates to a gas breaker that is configured to travel in the outer circumferential direction while moving the gas breaker, and the present invention will be described below based on an embodiment shown in the drawings.

FIG. 1 is an embodiment showing the closed circuit state of the gas breaker according to the present invention. Reference numeral 1 is a disc-shaped movable contact, which is formed in a conical shape, and has a fixed contact 2 in its center when the circuit is closed. A contact portion 1' that maintains contact is provided, and the plate-shaped portion is provided with a chrysanthemum-shaped notch 11 extending toward the outer circumference and extending to the outermost edge, as shown in FIG. , a ring 12 made of an insulator is fixed.

A piston ring 13 is fitted on the outer circumferential side of this ring so that it can slide and move toward the inner circumferential side of the insulating cylinder 3, and when it moves, this contact 1 performs a piston action and a guiding action at the same time. It is configured as follows.

The back surface of the notch 11 is provided with one end that moves upward to open the notch when the movable contact moves in the contact direction, and closes the notch when it is separated. A check valve 14 is provided, which is formed by fixing one side of a flexible insulating thin plate made of, for example, Teflon or synthetic rubber.

4 is an end cover airtightly fixed to one open end of the insulating cylinder 3;
Reference numeral 15 denotes a movable contact rod that is slidably provided through the end cover 4, and the movable contact 1 is attached to one end, and the other end is connected to the operating device 6 via the insulated operating rod 8. .

7 is an O-ring that maintains airtightness between the movable contact rod 15 and the end cover 4, and 9 is a current collector.

Reference numeral 5 denotes a cup-shaped magnetic core that also serves as an end cover and has a protruding magnetic path 5' in the center, and a magnetic coil 10 is housed inside the core, and is hermetically fixed to the other open end of the insulating tube 3. , also serves as an end cover.

Reference numeral 2 denotes a cylindrical fixed contact, which is attached to the outer periphery of the protruding magnetic path 5' and the inner periphery of the magnetic coil 10.

Reference numeral 20 denotes an arc runner, which is provided on the outer periphery of the fixed contact 2 to face the movable contact 1. One point on the side is electrically connected to one end P of the magnetic coil 10.

Reference numeral 16 denotes a blowing hole provided in the center of the movable contact 1 in order to fix the arc-extinguishing gas in the gas chamber 30 formed by the movable contact 1, the insulating tube 3, and the end cover 4, and to direct it to the side of the movable contact 1. .

Note that 22 and 44 are the terminals of the main circuit breaker.

Next, its operation will be explained.

As explained above, FIG. 1 shows the closed circuit state, and the case where the shutoff operation is performed from this state will be explained.

When a cutoff command is issued and the operating device 6 operates and the operating rod 8 moves downward, the movable contact 1 also moves downward and separates from the fixed contact 2, but the subsequent operation will be explained with reference to FIG.

FIG. 2 is a diagram showing the cutoff process, and the same reference numerals as in FIG. 1 indicate the same things.

When the operating rod 8 moves downward, the movable contact 1 moves toward the end cover 4.
The fixed contact 2 moves smoothly while being supported and guided by the penetration part of the movable contact 1, the outer periphery of the movable contact 1, and the sliding points on the inner periphery of the insulating cylinder.
and separate.

When the fixed and movable surface contacts are separated, an arc A is first generated near the contact point.

At this time, since the check valve 14 is closed, the movable contact 1 performs a piston action simultaneously with the movement of the movable contact 1.
As a result, the gas pressure in the gas chamber 30 increases, and the gas is blown from the blowing hole 16 toward the arc.

Therefore, the arc quickly moves to position B and moves to the arc runner 20.

Due to the movement of this arc, the magnetic coil 10 is energized,
A strong magnetic field H is created by the arc current.

Due to the action of the magnetic field, the arc receives a strong force that causes it to rotate on the contact surface around the blowing hole 16 at high speed, and at the same time, the gas is sprayed from the center of the movable contact 1 toward the outer periphery as described above. As a result, the arc rotates at high speed and moves toward the outer periphery of the contact like arcs C and D, and is cooled and extinguished.

When the arc is extinguished, the arc A first rotates around the contact portion 1' and its surroundings, and then moves toward the outer circumference to form the arcs B, C, and so on.
..., the rotation of the arc foot on the movable contactor 1 side is restrained by the notch 11, and the arc is extended and easily extinguished.

Next, when the circuit is closed, the movable contact 1 is pushed up by the contact rod 15 and joined to the fixed contact 2 by the operation of the operating device 6 in the opposite direction, but at this time, due to the action of the check valve 14,
When the notch is opened, the movable contact moves smoothly with almost no resistance due to gas pressure.

As described above, in the present invention, the insulating tube 3 that forms the shielding wheel for the movable contact 1 also functions as a piston that becomes the cylinder, so that the insulating tube 3 also acts as a guide. At the same time, the movable contact 1 can be operated more smoothly with a simple configuration.

A magnetic coil 1 is placed inside a cup-shaped magnetic core 5 that also serves as an end cover.
0 is housed and rotates the arc, the iron core 5 receives electromagnetic force, the ampere turns of the magnetic coil 10 can be arbitrarily selected, and the magnetic field is strengthened.

Furthermore, since the movable contact 1 is provided with a chrysanthemum-shaped notch 11 and a check valve 14 on the back thereof, gas can be easily supplied to the back of the movable contact 1 when turning on, and the circuit can be closed quickly. At the same time, as the arc moves toward the outer circumference, the rotation is restrained by the notch 11 on the side of the movable contact 1, causing extension of the arc, and the arc runner 20 and the movable contact 1 have a conical cross section. The distance between the electrodes increases from the top to the outer periphery, which has the effect of further elongating the arc, increasing the arc voltage, and making it easier to extinguish the arc.

[Brief explanation of drawings]

Fig. 1 is a partial vertical sectional view showing an embodiment of the present invention, Fig. 2 is a partial longitudinal sectional view showing its operating state, and Fig. 3 is a partial longitudinal sectional view of the movable contact used in the embodiment of Fig. 1. FIG. 1 is a movable contact, 1' is a contact part of the movable contact 1, 2 is a fixed contact, 3 is an insulating cylinder, 4 is an end cover, 5 is a cup-shaped magnetic core that also serves as an end cover, 10 is a magnetic coil , 16 is a gas blowing hole, 20 is an arc runner

Claims (1)

[Scope of utility model registration request] It has a gas blowing hole in the center, a contact part around it, a chrysanthemum-shaped cutout extending toward the outer circumference, and a ring made of an insulating material on the outermost circumference. A disk-shaped movable contact that is fixed, a piston ring is fitted on the outer periphery thereof, the cross section is formed into a conical shape, and a check valve is provided on the back surface of the notch, and this movable contact a cylindrical fixed contact facing the contact portion; an arc runner provided on the outer periphery of the fixed contact facing the disc-shaped movable contact and having a conical cross section; An insulating cylinder in which these are housed and filled with arc-extinguishing gas and in which the piston ring of the movable contact slides on the inner wall, and a protruding magnetic path configured in the center are inside the cylindrical fixed contact. A cup-shaped magnetic core that is inserted and attached to one end of the insulating cylinder and also serves as an end cover, a magnetic coil disposed between the magnetic core and the arc runner, and the other parts of the insulating cylinder. 1. A gas breaker comprising an end cover having a closed end and through which a contact rod connected to the movable contact passes.