Gas circuit breaker

Patent metadata

Field	Value
Publication number	US-9543095-B2
Application number	US-201414768691-A
Country	US
Kind code	B2
Filing date	Feb 3, 2014
Priority date	Mar 8, 2013
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

A gas circuit breaker is configured by comprising a tank filled with arc extinguishing gas, a pair of fixed side arc contact and moving side arc contact in the tank, a puffer chamber formed with a puffer cylinder including the moving side arc contact at its end and a fixed piston, and an insulating nozzle, attached to the end of the puffer cylinder, surrounding the moving side arc contact, that forms a flow channel to guide arc extinguishing gas from the puffer chamber to the contacts. A puffer cylinder 104 has a cylindrical member 104 a at a breaker side end, an end of the insulating nozzle 101 is provided in the cylindrical member 104 a . And the gas circuit breaker is configured by further comprising a hollow moving side main contact 102 at a breaker side end of the cylindrical member 104 a , a pressing metal fitting 103 to engage an insulating nozzle 101 in the hollow part of the moving side main contact 102.

First claim

The invention claimed is:

1. A gas circuit breaker comprising:
a tank filled with an arc extinguishing gas;
a fixed side arc contact and moving side arc contact in the tank;
a puffer chamber formed with a puffer cylinder including the moving side arc contact at an end and a fixed piston; and
an insulating nozzle, attached to the end of the puffer cylinder, surrounding the moving side arc contact, that forms a flow channel to guide the arc extinguishing gas from the puffer chamber to the contacts,
wherein the arc extinguishing gas in the puffer chamber is compressed in accordance with opening operation of the contacts and blown to an arc between the contacts,
wherein the puffer cylinder has a cylindrical member at a breaker part side end,
wherein an end of the insulating nozzle is provided in the cylindrical member, and
further comprising:
a hollow moving side main contact at a breaker part side end of the cylindrical member; and
an engagement member that engages the insulating nozzle in a hollow part of the moving side main contact, and
wherein the engagement member has a long hole in which a position of the engagement member in the hollow part is adjustable in a diameter direction of the insulating nozzle.

2. The gas circuit breaker according to claim 1 , wherein the engagement member has a positioning hole,
wherein the moving side main contact has a position regulating hole for the engagement member, and
wherein a positioning jig is inserted in the positioning hole through the position regulating hole, and the position of the engagement member is adjusted in the diameter direction of the insulating nozzle.

3. The gas circuit breaker according to claim 1 , wherein the engagement member is fixed to an end of the cylindrical member in a position different from that of the moving side main contact.

4. The gas circuit breaker according to claim 3 , wherein the engagement member has a positioning hole,
wherein the moving side main contact has a position regulating hole for the engagement member, and
wherein a positioning jig is inserted in the positioning hole through the position regulating hole, and the position of the engagement member is adjusted in the diameter direction of the insulating nozzle.

5. The gas circuit breaker according to claim 3 , wherein the engagement member has a circular member on an inner diameter side that fixes an outer periphery of the insulating nozzle.

6. The gas circuit breaker according to claim 1 , wherein the engagement member is fastened along with the moving side main contact to an end of a cylindrical member of the puffer cylinder with a bolt.

7. The gas circuit breaker according to claim 6 , wherein the engagement member has a circular member on an inner diameter side that fixes an outer periphery of the insulating nozzle.

8. The gas circuit breaker according to claim 6 , wherein the engagement member has a positioning hole,
wherein the moving side main contact has a position regulating hole for the engagement member, and
wherein a positioning jig is inserted in the positioning hole through the position regulating hole, and the position of the engagement member is adjusted in the diameter direction of the insulating nozzle.

9. The gas circuit breaker according to claim 1 , wherein the engagement member has a circular member on an inner diameter side that fixes an outer periphery of the insulating nozzle.

10. A gas circuit breaker comprising:
a tank filled with an arc extinguishing gas;
a fixed side arc contact and moving side arc contact in the tank;
a puffer chamber formed with a puffer cylinder including the moving side arc contact at an end and a fixed piston; and
an insulating nozzle, attached to the end of the puffer cylinder, surrounding the moving side arc contact, that forms a flow channel to guide the arc extinguishing gas from the puffer chamber to the contacts,
wherein the arc extinguishing gas in the puffer chamber is compressed in accordance with opening operation of the contacts and blown to an arc between the contacts,
wherein a hollow cylindrical moving side main contact is provided at a breaker part side end of the puffer cylinder,
wherein a hollow part is provided at a breaker part side end of the hollow cylindrical moving side main contact,
wherein an end of the insulating nozzle is disposed in the hollow cylindrical moving side main contact,
wherein the hollow part of the moving side main contact has an engagement member that engages the insulating nozzle, and
wherein the engagement member has a long hole in which a position of the engagement member in the hollow part is adjustable in a diameter direction of the insulating nozzle.

Assignees

• Hitachi Ltd

Inventors

• Kaneko Yuji
• Yaginuma Noriyuki
• Nomura Daisuke
• Hirose Makoto

Classifications

• H01H33/91

  the arc-extinguishing fluid being air or gas · CPC title

• H01H33/7061

  characterised by use of special mounting means (H01H33/7023 - H01H33/7038 take precedence) · CPC title

• H01H33/70 Primary

  Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid · CPC title

• H01H33/56

  Gas reservoirs · CPC title

• H01H33/04 Primary

  Means for extinguishing or preventing arc between current-carrying parts · CPC title