JPH0917289A - Gas-disconnector - Google Patents

Abstract

PURPOSE: To prevent buckling of a contact and always maintain shut off and closing performance good by fixing a ring to the root of a tulip contact to regulate the falling down of the contact to the inside. CONSTITUTION: A ring 10 is fixed to the outside of a root of a tulip contact 3. The ring 10 is fixed to between a tact spring 4 and a fixed electrode 2 to prevent widening of the root side of the contact 3 to the outside. The ring 10 regulates falling down of the tip of the contact 3 to the inside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary arc extinguishing type gas circuit breaker.

[0002]

2. Description of the Related Art Conventionally, a rotary arc extinguishing type circuit breaker is
For example, as shown in FIG. 2, a fixed electrode 2 is provided in a sealed container 1 filled with an insulating arc-extinguishing gas, and the fixed electrode 2 is connected to a bus bar 20 extending from the side surface side of the sealed container 1. A flange 22 is provided at the tip of the cylindrical end 21 of the fixed electrode 2. The tulip contact 3 is in contact with the outside of the end 21. The tulip contactor 3
It is composed of a plurality of plate-like contact pieces 31, and projections 32 are provided at both ends of the contact pieces 31, and the plurality of contact pieces 31 are annularly arranged on the outer circumference of the end 21 of the fixed electrode 2. The contact piece 31 is brought into contact with the end portion 21 of the fixed electrode 2 by being hooked on the flange portion 22, and the ring-shaped tact spring 4 is fitted on the outer side of one end of the contact piece 31 on the end portion 21 side, so that the tulip contactor 3 is formed so as to be constantly in electrical contact with the fixed electrode 2 by the compression force of the tact spring 4. A ring-shaped tact spring 5 is fitted on the outside of the other end of the tulip contactor 3, and when the circuit is closed,
The movable contact 6 is swingable so that it can come into contact with the movable contact 6, and a compressive force of the tact spring 5 applies a pressure in the direction in which the movable contact 6 is tightened. A blow coil 8 is wound around an outer side of the tulip contact 3 via an insulating cylinder 7 fixed to the fixed electrode 2, and an arc electrode 9 is fixed to the tip of the insulating cylinder 7 so that the arc electrode 9 is fixed. 9 and the fixed electrode 2 are electrically connected by a blow coil 8.
The movable contact 6 is a bus bar 6 fixed to the side surface of the enclosure.
0 through a sliding contact portion 61. (For example, Japanese Utility Model No. 61-100856, Japanese Utility Model Publication No. 62-913.
No. 19). FIG. 3 is an operation explanatory view showing a process from the closed state to the opened state of the movable contactor 6, where is a closed state,
Indicates the process of the breaking operation, and indicates the open state. When the breaking operation is started, the tulip contact 3 and the movable contact 6
The state where the and are in contact with each other is separated from each other, and the arc A is generated between the tulip contact 3 and the movable contact 6. In the next state, the leg of the arc A on the tulip contact 3 side moves to the arc electrode 9. This arc current flows through the blow coil 8 connected to the fixed electrode 2 and the arc electrode 9, and a magnetic flux Φ is generated. This magnetic flux Φ
Thus, the arc is driven to rotate according to Fleming's law, and the arc is extinguished at the current zero point.

[0003]

However, in the above prior art, the magnetic flux Φ is generated by the arc current generated in the arc extinguishing process.
However, the arc current also flows through the tulip contact 3 and the bus bar 20 connected to the fixed electrode 2−the fixed electrode 2
A current loop is formed in the order of-tulip contact 3-arc A-arc electrode 9-movable contact 6-bus bar 60. Due to this current loop, the contact piece 31 of the tulip contactor 3 receives the magnetic attraction force F directed inward, and the tip of the contact piece 31 on the bus bar side is pressed inward. Further, the arc extinguishing gas is heated by the arc generated in the arc extinguishing process, and the gas flow G shown by the arrow in FIG. 4 is generated. When the breaking current increases, the arc energy also increases, so the gas flow G generated by the arc impacts. Become stronger. Therefore, the tip of the tulip contactor 2 is pressed inward. The root side of the contact piece 31 of the tulip contactor 3 is clamped to the outside of the end 21 of the fixed electrode 2 by the compressive force of the tact spring 4, but the tip side of the contact piece 31 is pressed inward with a shocking force. With the principle of leverage with the flange portion 22 as a fulcrum, the base side of the contact piece 31 expands outward with a large force, and the expansion cannot be stopped by the tact spring 4, and after the interruption, the plurality of contact pieces 31 of the tulip contactor 3 are blocked. One or two of them tended to compete with each other and jumped out inward (contact piece 31 '). Therefore, at the time of next charging, the tip of the movable contactor 6 collides with the protruding contact piece 31 ′, the contact piece 31 ′ buckles, and there is a possibility that the contact piece 31 ′ cannot be disconnected at the next disconnection. It is an object of the present invention to provide a safe gas circuit breaker that does not have a possibility of being unblockable.

[0004]

In order to solve the above problems, the present invention provides a fixed electrode provided in a sealed container filled with an insulating arc-extinguishing gas, and a flange provided at the end of the fixed electrode. Part, a tulip contactor composed of a plurality of plate-shaped contact pieces annularly arranged outside the cylindrical end of the fixed electrode, and projecting inward at both ends of the contact piece so as to be caught by the flange portion. A protrusion, a tact spring fitted to the outer circumference of the tulip contact, an insulating cylinder fixed to the fixed electrode provided outside the tulip contact, a blow coil wound around the insulating cylinder, and the insulation In a gas circuit breaker equipped with an arc electrode fixed to the tip of a cylindrical body, at the base of the tulip contact,
A ring having an inner diameter substantially the same as the outer diameter of the root of the tulip contactor when the circuit is opened is mounted.

[0005]

With the above-mentioned means, the ring which prevents the tulip contact from spreading is attached between the tact spring provided on the base side of the tulip contact and the fixed electrode, so that the magnetic attraction generated by the arc at the time of interruption is attached. Even if the tip side of the tulip contactor is pushed inward by the force and gas flow and the root side of the tulip contactor tries to expand with the flange as a fulcrum, it is suppressed by the ring and the tip end of the tulip contactor 3 moves inward. It will not fall down. As a result, at the time of next charging, the tip of the movable contact collides with the protruding contact piece, and the contact piece does not buckle.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a front sectional view showing an embodiment of the present invention, the main structure of which is substantially the same as that of the conventional example shown in FIG. 2 except that a ring 10 is attached to the outside of the root of the tulip contactor 3. Is. That is, in the figure, 1 is a sealed container, 2 is a fixed electrode, 21 is a cylindrical end portion, 22 is a flange portion, 3 is a tulip contactor arranged in contact with the outer periphery of the end portion of the fixed electrode 2, 31 is a tulip. It is a plurality of plate-like contact pieces that constitute the contactor 3, and projections 32 projecting inward are provided at both ends. Reference numerals 4 and 5 denote tact springs fitted to the outer sides of the root side and the tip side of the tulip contactor 3, and 6
Is a movable contact that can move toward the fixed electrode 2, 7 is an insulating cylinder that is arranged outside the tulip contact 3 and is fixed to the fixed electrode 2, and 8 is a blow coil that is wound around the insulating cylinder 7. , 9 are arc electrodes fixed to the tip of the insulating cylinder 4, and the arc electrode 9 and the fixed electrode 2 are blow coils 8
Are electrically connected by

At the base side of the tulip contactor 3, a ring 10 is attached between the tact spring 4 and the fixed electrode 2,
The root side of the tulip contact 3 is prevented from spreading outward. The inner diameter of the ring 10 is substantially the same as the outer diameter of the root side of the annular tulip contactor 3 when the ring is opened. Since the outer diameter of the root side of the tulip contactor 3 is smaller than the outer diameter when the tulip contactor 3 is opened when the circuit is closed, the ring 10 only restricts the tip of the tulip contactor 3 from falling inward and opens and closes the circuit breaker. It does not affect the operation.
Therefore, even if the tip side of the tulip contactor 3 is pressed inward by the magnetic attraction force and gas flow generated by the arc at the time of interruption, and the root side of the tulip contactor 3 tries to expand with the flange portion 22 as a fulcrum, the ring 10 The tulip contact 3 is restrained from falling inward by being suppressed by. Therefore, after the interruption, the contact piece 31 of the tulip contactor 3 does not jump out inward and is always maintained in a normal state.

[0008]

As described above, according to the present invention, a ring is attached to the base of the tulip contactor to limit the recoil of the tulip contactor to the inside, which prevents arcing when shutting off. The collapse due to the magnetic attraction force and gas flow that accompanies it is eliminated, and buckling of the tulip contact is prevented,
There is an effect that it is possible to provide a safe circuit breaker that can always maintain good breaking / closing performance.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention.

FIG. 2 is a side sectional view showing a conventional example.

FIG. 3 is an explanatory diagram showing an operation of a conventional example.

FIG. 4 is an explanatory view showing a state of a tulip contactor of a conventional example.

[Explanation of symbols]

1: Enclosed container, 10: Ring, 2: Fixed electrode, 20: Bus bar, 21: End part, 22: Flange part, 3: Tulip contactor, 31: Contact piece, 4, 5 tact spring, 6
Movable contactor, 60: Bus bar, 61: Sliding contact part, 7
Insulated cylinder, 8 blow coil, 9 arc electrode

Claims (1)

[Claims] 1. A fixed electrode provided in a sealed container filled with an insulating arc-extinguishing gas, a flange portion provided at a tip of an end portion of the fixed electrode, and an outer side of a cylindrical end portion of the fixed electrode. A tulip contactor composed of a plurality of plate-shaped contact pieces arranged in an annular shape, a projection portion projecting inward at both ends of the contact piece so as to be caught by the flange portion, and a tact spring fitted to the outer circumference of the tulip contactor. A gas shield provided with an insulating cylinder provided outside the tulip contact and fixed to the fixed electrode, a blow coil wound around the insulating cylinder, and an arc electrode fixed to the tip of the insulating cylinder. At the base of the tulip contactor,
A gas circuit breaker equipped with a ring whose inner diameter is approximately the same as the outer diameter of the base of the tulip contactor when the tulip is open.