US 5,229,561 A · Puffer-type gas circuit breaker

Abstract

A puffer type gas circuit breaker includes arc extinguishing gas filled in the interior of the gas circuit breaker, fixed contact, a movable contact disposed in an opposed relationship with respect to the fixed contact so as to come into contact therewith, a fixed piston and a drive shaft slidably extends through the fixed piston, and drives the movable contact toward and away from the fixed contact. A puffer cylinder is slidably fitted on the fixed piston, with the puffer cylinder cooperating with the fixed piston to define a puffer chamber, within the puffer cylinder. An outer cylinder is mounted on an outer periphery of the puffer cylinder to form a thermal puffer chamber outside the puffer cylinder. A cover covers an outer surface of the movable contact, with a first insulating nozzle surrounding the cover to form a first gas flow passage for guiding the arc extinguishing gas from the puffer chamber to an arc generating portion. A second insulating nozzle surrounds the first insulating nozzle to form a second gas flow passage for guiding the arc extinguishing gas from the thermal puffer chamber to the arc generating portion.

Claims15

Dependent claims

A puffer-type gas circuit breaker comprising:

arc extinguishing gas filled in an interior of said gas circuit breakers;
a fixed contact;
a movable contact disposed in an opposed relationship with respect to said fixed contact so as to come into contact with said fixed contact;
a fixed piston;
a drive shaft slidably extending through said fixed piston and being adapted to drive said movable contact toward and away from said fixed contact;
a puffer cylinder slidably fitted on said fixed piston, said puffer cylinder cooperating with said fixed piston to define a puffer chamber within said puffer cylinder;
an outer cylinder mounted on an outer periphery of said puffer cylinder to form a thermal puffer chamber outside said puffer cylinder;
a cover covering an outer surface of said movable contact;
a first insulating nozzle surrounding said cover to form a first gas flow passage for guiding the arc extinguishing gas from said puffer chamber to an arc generating portion and having a throat portion surrounding said fixed contact;
and
a second insulating nozzle surrounding said first insulating nozzle to form a second gas flow passage for guiding the arc extinguishing gas from said thermal puffer chamber to said arc generating portion and having a throat portion surrounding said fixed contact.

8 more elements

Dependencies are inferred from the claim text.

Puffer-type gas circuit breaker

Life of this patent

Puffer-type gas circuit breaker

Life of this patent

Abstract

Claims15