Gas circuit breaker

Patent metadata

Field	Value
Publication number	US-9704679-B2
Application number	US-201414904193-A
Country	US
Kind code	B2
Filing date	Apr 18, 2014
Priority date	Jul 19, 2013
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

A gas circuit breaker including a pair of main contacts is openable inside an insulating tank. A pair of arc contacts is arranged on the inner side of the main contacts, and a puffer cylinder has the main contacts and the arc contacts at an end. A puffer chamber is formed inside the puffer cylinder, and a puffer piston is provided on the inner periphery of the puffer cylinder. An insulating nozzle part is mounted on an end of the puffer cylinder to surround the arc contact. The insulating nozzle part includes a split nozzle base part and a split nozzle end part, and the split nozzle base part has a throat part.

First claim

The invention claimed is:

1. A gas circuit breaker comprising:
a pair of main contacts being openable inside an insulating tank;
a pair of arc contacts being arranged on an inner side of the main contacts;
a puffer cylinder having one of the main contacts and the arc contacts at an end;
a puffer chamber being formed inside the puffer cylinder;
a puffer piston being provided on an inner periphery of the puffer cylinder; and
an insulating nozzle part being mounted on an end of the puffer cylinder to surround the one arc contact, wherein
the insulating nozzle part includes a split nozzle base part and a split nozzle end part,
the split nozzle base part has a throat part,
a fitting part is provided in a connection part of the split nozzle end part and the split nozzle base part, and
the fitting part has a first gap, a second gap, and a third gap, the first gap and the third gap opening in an axial direction of the insulating nozzle part, and the second gap connecting the first gap and the third gap, and opening in a radial direction of the insulating nozzle part.

2. The gas circuit breaker according to claim 1 , wherein the second gap is narrower than the first gap and the third gap.

3. The gas circuit breaker according to claim 2 , further comprising a guard part being provided on an outer periphery of the split nozzle end part.

4. The gas circuit breaker according to claim 2 , slits are provided on an inner side of the split nozzle end part.

5. The gas circuit breaker according to claim 1 , further comprising a guard part being provided on an outer periphery of the split nozzle end part.

6. The gas circuit breaker according to claim 5 , slits are provided on an inner side of the split nozzle end part.

7. The gas circuit breaker according to claim 1 , wherein slits are provided on an inner side of the split nozzle end part.

8. The gas circuit breaker according to claim 1 , wherein a slit is provided on the inner side of the split nozzle end part.

Assignees

• Hitachi Ltd

Inventors

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

Classifications

• H01H33/91 Primary

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

• H01H33/74

  wherein the break is in gas (in air at atmospheric pressure H01H33/73) · CPC title

• H01H33/7023

  characterised by an insulating tubular gas flow enhancing nozzle (H01H33/7038 takes precedence) · CPC title

• H01H33/703

  having special gas flow directing elements, e.g. grooves, extensions · CPC title

• H01H2205/002

  fixed to operating part · CPC title