JP2000030580A - Puffer type gas-blast circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hybrid puffer type gas-blast circuit breaker improving thermal efficiency, reducing the pressure loss in a passage, and capable of efficiently spraying cutoff gas to the arcs generated on a moving element, a contact moving element, a stator and among these electrodes. SOLUTION: This circuit breaker is provided with a moving element passage 8 guiding the arc-extinguishing gas fed from a feed port 9 to arcs generated on the moving element 5, a stator 7 and between these electrodes and a nozzle 6 installed to surround the moving element 5 for spraying the arc-extinguishing gas to arcs and the stator 7. The center section of a thermal puffer chamber 4, the moving element passage 8, and the center section of the downstream passage of the nozzle 6 are arranged in a straight line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a puffer-type gas circuit breaker, and more particularly to a hybrid-type puffer-type gas circuit breaker using both a heat puffer chamber and a mechanical puffer chamber.

[0002]

2. Description of the Related Art When a breaking current is large, a strong arc is generated between the poles, and the pressure is increased by heating an arc-extinguishing gas in a heat puffer chamber mainly by using heat energy generated from the arc. When the arc-extinguishing gas is blown to the arc and the breaking current is small, a hybrid-type puffer-type gas that mainly increases the pressure by compressing the arc-extinguishing gas in the mechanical puffer chamber with a piston and blows the arc-extinguishing gas onto the arc There is a circuit breaker, for example, Japanese Patent Application No. 63-281536 (refer to).

During normal energization, the movable contact 15 at the tip of the movable element 5 and the stator 7 are connected by a spring force, so that the electrode is opened and the arc-extinguishing gas (insulating gas) in the mechanical puffer chamber 3 is opened. ) Is performed synchronously.

A mechanical puffer chamber 3 is formed between a movable puffer cylinder 1 and a piston 2 having one end fixed by a piston fixing column 11. The puffer cylinder 1 is connected to an operating device (not shown) by an operating rod 10 and operates the operating device in a direction in which the volume of the mechanical puffer chamber 3 is reduced, thereby compressing the arc-extinguishing gas inside the mechanical puffer chamber 3. Increase pressure. The mechanical puffer flow path 14 that guides the arc-extinguishing gas from the mechanical puffer chamber 3 to the arc is:
It is formed in a double cylindrical shape formed between the outside of the mover 5 and the separator 18, and is configured to merge at a nozzle inlet portion near the tip of the mover 5, and the combined flow path Is branched into a mover side and a stator side.

The arc-extinguishing gas in the mechanical puffer chamber 3, which has been increased in pressure by the compression of the piston 2, flows into the mechanical puffer flow path 14.
Through the movable contact 15, the stator 7 and the arc 12 to be blown. The arc-extinguishing gas blown to the mover 5 is exhausted through an exhaust passage 17 provided inside the mover 5. On the other hand, the flow path on the side of the stator 7 is provided with a divergent nozzle 6 whose area gradually increases, and the arc-extinguishing gas passes through a flow path 13 at the nozzle downstream portion formed on the inner surface of the nozzle downstream portion. The arc is generated between the movable contact 15 and the stator 7 and is sprayed on the stator 7. The outlet end of the flow path 13 downstream of the nozzle is an open space, and the arc-extinguishing gas blown to the stator is
From the outlet of the Such a structure in which the arc-extinguishing gas is branched and blown to the mover 5 side and the stator 7 side is called a double flow type.

The thermal puffer chamber 4 contains the thermal puffer cylinder 1
9 separates the puffer chamber 3 from the mechanical puffer chamber 3 and keeps a constant volume regardless of the movement of the puffer cylinder 1. A heat puffer flow path 16 that guides the heat energy of the arc 12 to the heat puffer chamber 4 and guides the arc-extinguishing gas from the heat puffer chamber 4 to the arc 12 is provided between the separator 18 and the nozzle 6. A curved flow path exists in the middle of the puffer flow path 16.

When the cutoff current is large, a strong arc 12 is formed between the electrodes, and the heat energy of the arc 12 is introduced into the heat puffer chamber 4 through the heat puffer passage 16 to heat the arc-extinguishing gas. The heated arc-extinguishing gas expands, and the pressure in the thermal puffer chamber 4 increases.

In the prior art shut-off portion structure, there is a problem that heat energy is not effectively used because a part of the heat energy is discharged from the exhaust flow path due to the presence of the exhaust flow path. In addition, there is a problem that a pressure loss is large because a curved flow path is present in the middle of the heat puffer flow path. further,
In the case of the double flow type structure, there is a problem that a large flow rate of the arc-extinguishing gas is required because the arc-extinguishing gas is branched and blown to both the mover side and the stator side.

[0009]

In the conventional hybrid type puffer type gas circuit breaker, since an exhaust passage is provided on the mover side, a part of heat energy is released to the outside through the exhaust passage. There is a problem that energy is not used effectively. In addition, there is a problem that a pressure loss is large because a curved flow path is present in the middle of the heat puffer flow path. Further, in the case of the double flow structure, there is a problem that a large amount of gas is required because the arc-extinguishing gas is branched and blown to the mover side and the stator side.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hybrid type puffer type gas circuit breaker in which the recovery rate of heat energy is increased.
An object of the present invention is to provide a hybrid-type puffer-type gas circuit breaker that can efficiently obtain a blowing pressure by a thermal puffer effect. It is another object of the present invention to provide a small-sized shut-off portion by reducing the amount of the arc-extinguishing gas by spraying the arc-extinguishing gas from one direction to the movable contact, the arc, and the stator.

[0011]

In order to achieve the above object, a puffer type gas circuit breaker according to the present invention comprises a stator and a mover provided to perform opening and closing operations with the stator. A heat puffer chamber, a supply port provided at the center of the heat puffer chamber and supplying an arc-extinguishing gas from the heat puffer chamber to a downstream side thereof, and supplying the arc-extinguishing gas supplied from the supply port to the The mover, the stator and the passage inside the mover leading to an arc generated between the poles, a mechanical puffer chamber formed of a puffer cylinder and a piston, and an arc-extinguishing gas in the mechanical puffer chamber passing through the thermal puffer chamber. A mechanical puffer flow path that leads to the mover internal flow path without performing, and a nozzle that is installed to surround the mover and sprays an arc-extinguishing gas to the arc and the stator, and the thermal puffer chamber The central part of the mover Flow path and a central portion of the nozzle downstream portion flow path arranged in a straight line, is characterized in that it has to blow the movable contact, the arc extinguishing gas to the arc and the stator.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the hybrid type gas circuit breaker of the present invention will be described below with reference to FIG. FIG. 1 is a longitudinal sectional view of a hybrid-type puffer-type gas circuit breaker in the middle of a cutoff according to the present embodiment.

As shown in FIG. 1, the puffer type gas circuit breaker of the present embodiment is configured as follows. The mechanical puffer chamber 3 is formed in a space between the puffer cylinder 1, the inner cylinder 20 and the piston 2, and the piston 2 is fixed by a piston fixing column 11. Puffer cylinder 1
Is provided such that a mechanical puffer flow path 14 communicating with the mover inner flow path 8 surrounds the thermal puffer chamber 4,
The gas compressed in the mechanical puffer chamber 3 is guided to the mover inner flow path 8 without passing through the thermal puffer chamber 4.

The thermal puffer chamber 4 contains the thermal puffer cylinder 1
The space surrounded by 9 is separated from the machine puffer chamber 3. A supply port 9 is provided at the center of the thermal puffer chamber 4, and a mover 5 is provided at an outlet thereof. A mover inner flow path 8 for guiding the arc-extinguishing gas to the movable contact 15, the stator 7, the arc 12, and the like is formed inside the mover 5, and the mover 5 is surrounded outside the mover 5. Is provided with a nozzle 6. One end of the stator 7 is fixed to a tank (not shown), and the other end is movable contactor 1 before opening.
5 is in contact with it. Here, the central part of the heat puffer chamber 4, the central part of the mover inner flow path 8, and the central part of the nozzle downstream flow path 13 are configured to be linear.

On the other hand, an operating rod 10 is connected to the center of the inner cylinder 1, and the other end of the operating rod 10 is connected to an operating device (not shown) for operating the puffer cylinder 1. A piston fixing column 11 is connected to the piston 2, and the piston fixing column 11 is fixed to the tank.

When the operating device is operated, the operating rod 10 reciprocates. At this time, the puffer cylinder 1, the inner cylinder 20 and the mover 4 operate integrally. During the opening operation, the volume of the puffer chamber 3 is reduced by linearly moving the operation rod 10 to the left in FIG. 1, compressing the arc-extinguishing gas inside the puffer chamber 3 and fixing the puffer chamber 3 to the mover 4. The opening operation of the child 7 can be performed in conjunction. The compressed arc-extinguishing gas in the puffer chamber 3 is generated between the movable contact 15 and the movable contact 15 and the stator 7 through the mechanical puffer chamber flow path 14, the mover inner flow path 8 and the nozzle 6. It is sprayed on the arc 12 and the stator 7.

When the breaking current is large, a strong arc 12 is generated between the poles together with the opening operation of the mover contact 15 and the stator 7. The thermal energy generated from the arc 12 is guided to the thermal puffer chamber 4 through the mover inner flow path 8 and the supply port 9, and heats the arc-extinguishing gas stored in the thermal puffer chamber 4. The heated arc-extinguishing gas expands, so that the pressure in the heat puffer chamber 4 rises and is blown to the movable contact 15, the arc 12, and the stator 7.

In this embodiment, the central part of the heat puffer chamber and the central part of the flow path inside the mover and the central part of the flow path downstream of the nozzle are formed in a straight line, so that a curved flow path causing pressure loss can be eliminated. There is an effect that can be. Further, since the exhaust passage can be eliminated, there is an effect that the heat energy generated from the arc can be effectively used. Further, since the arc-extinguishing gas can be blown from one direction to the movable contact, the arc, and the stator, there is an effect that the gas flow rate required for shutoff can be reduced. Accordingly, there is an effect that the blocking unit can be reduced in size.

[0019]

By eliminating the exhaust passage, the amount of heat that can be recovered to the thermal puffer chamber can be increased. In addition, by forming the heat puffer chamber, the supply port, and the flow path in the mover in a straight line, the pressure loss in the curved flow path can be reduced, so that the efficiency of recovering the heat energy generated from the arc can be improved, and the heat puffer chamber can be improved. This has the effect of increasing the pressure. Also in the case where the gas in the heat puffer chamber is blown, the pressure loss in the flow path can be reduced by eliminating the curved flow path, so that the arc-extinguishing gas can be efficiently blown to the arc. Further, since the arc-extinguishing gas can be blown from one direction to the movable contact, the arc, and the stator, there is an effect that the gas flow rate required for breaking can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a puffer type gas circuit breaker according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a conventional puffer type gas circuit breaker.

[Description of Signs] 1 ... Puffer cylinder, 2 ... Piston, 3 ... Mechanical puffer chamber, 4 ... Heat puffer chamber, 5 ... Motor, 6 ... Nozzle, 7
... stator, 8 ... mover internal flow path, 9 ... supply port, 10 ... operation rod, 11 ... piston fixed support, 12 ... arc, 13
... Nozzle flow path, 14 mechanical puffer flow path, 15 movable contactor, 16 heat puffer flow path, 17 exhaust flow path, 18
... Separator, 19 ... Heat puffer cylinder, 20 ... Inner cylinder.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuto Urai 7-2-1, Omika-cho, Hitachi City, Ibaraki Prefecture Inside Power & Electricity Development Division, Hitachi, Ltd. (72) Katsutoshi Shimizu Omika-cho, Hitachi City, Ibaraki Prefecture No. 7-2-1 F-term in Hitachi, Ltd. Power & Electricity Development Division (Reference) 5G001 AA01 AA03 BB01 CC03 DD03 DD07 EE05 EE11 FF03

Claims (2)

[Claims] 1. A stator, an electrode provided for performing opening and closing operations with the stator, and a heat puffer chamber for generating a high pressure by heating an arc-extinguishing gas by the heat energy of an arc. A supply port provided at the center of the heat puffer chamber and supplying an arc-extinguishing gas from the heat puffer chamber to a downstream side thereof; and the movable element and the stator for supplying the arc-extinguishing gas supplied from the supply port to the movable element and the stator. And a flow path in the mover that guides an arc generated between the poles, a nozzle installed to surround the mover and blows an arc-extinguishing gas to the arc and the stator, and a puffer cylinder and a piston. A mechanical puffer chamber to be formed; and a mechanical puffer flow path leading from the mechanical puffer chamber to the flow path in the mover. A central part of the heat puffer chamber, and a central part of the flow path in the mover and the nozzle downstream flow path. Are arranged in a straight line Together, puffer type gas circuit breaker, characterized in that arc-extinguishing gas in the mechanical puffer chamber is to guide the mover in the flow path without passing through the heat puffer chamber. 2. The mechanical puffer flow path is arranged so as to surround the thermal puffer chamber, and is formed so as to directly guide the arc-extinguishing gas in the mechanical puffer chamber to the flow path in the mover without passing through the thermal puffer chamber. The puffer-type gas circuit breaker according to claim 1, wherein: