Circuit breaker

A circuit breaker which has in an enclosure filled with an insulating gas at least one interrupting chamber extending along a longitudinal axis comprising:

• an arcing volume;
• and
• at least two associated arcing contacts, the arcing volume being actively connected to at least one exhaust having an exhaust volume which is constructed for cooling hot gases generated during breaking operations and is connected to a volume of the interrupting chamber, wherein in the area of the exhaust at least one forcibly created recirculation area is provided which increases the flow resistance of the hot gases, wherein
• the hot gases flow from the arcing volume into an intermediate volume,
• following the intermediate volume, a flow tube constructed in the manner of a laval nozzle and having a nozzle constriction leads into the exhaust volume which is connected to the interrupting chamber volume,
• in the intermediate volume, at least one baffle plate protruding into the flow of the hot gases is provided, downstream of which a first recirculation area forms, and
• the baffle plate has approximately the same effective area as an entry area, designated as area FD, of the hot gases into the intermediate volume, and/or
• the cross section, designated as area F1, of the flow tube is constructed to be of the same size in the area of the exit edge as the area FD, and/or
• an annular area FA, located between the baffle plate and the wall, has 30% to 80% of the area FD, and/or
• an area FE, which represents the cross section of the nozzle constriction of the flow tube, has 50% to 70% of the area FD.

A circuit breaker which has in an enclosure filled with an insulating gas at least one interrupting chamber extending along a longitudinal axis comprising:

• an arcing volume;
• and
• at least two associated arcing contacts, the arcing volume being actively connected to at least one exhaust having an exhaust volume which is constructed for cooling hot gases generated during breaking operations and is connected to a volume of the interrupting chamber, wherein in the area of the exhaust at least one forcibly created recirculation area is provided which increases the flow resistance of the hot gases, wherein
• the hot gases flow from the arcing volume into an intermediate volume,
• following the intermediate volume, a flow tube constructed in the manner of a laval nozzle and having a nozzle constriction leads into the exhaust volume which is connected to the interrupting chamber volume,
• in the exhaust volume, means are provided which deflect the flow of the hot gases by up to 180°, and
• an annular area F2, which represents the cross section between the exit edge of the flow tube and the exhaust housing, has 50% to 70% of the area FD, and/or
• an annular area F3, which specifies the cross section lying between the nozzle constriction of the flow tube and the imaginary extension of the exhaust housing, is constructed to be of approximately the same size as the area FD, and/or
• between the outside wall of the constriction and an end edge of the exhaust housing, a cylindrical exit area F4 remains which is constructed to be approximately of the same size as the area FD.

A circuit breaker which has in an enclosure filled with an insulating gas at least one interrupting chamber extending along a longitudinal axis comprising:

• an arcing volume;
• and
• at least two associated arcing contacts, the arcing volume being actively connected to at least one exhaust having an exhaust volume which is constructed for cooling hot gases generated during breaking operations and is connected to a volume of the interrupting chamber, wherein in the area of the exhaust at least one forcibly created recirculation area is provided which increases the flow resistance of the hot gases, wherein
• the hot gases flow from the arcing volume into an intermediate volume,
• following the intermediate volume, a flow tube constructed in the manner of a laval nozzle and having a nozzle constriction leads into the exhaust volume which is connected to the interrupting chamber volume,
• in the intermediate volume, at least one baffle plate protruding into the flow of the hot gases is provided, downstream of which a first recirculation area forms, and
• following the nozzle constriction which is arranged in the flow tube constructed in the manner of a laval nozzle and attached to the intermediate volume, openings are provided in the wall of the flow tube which enable gas to enter into the interior of the flow tube, as a result of which at least one second recirculation area is mandatorily generated during a switching-off operation.

A circuit breaker which has in an enclosure filled with an insulating gas at least one interrupting chamber extending along a longitudinal axis comprising:

• an arcing volume;
• and
• at least two associated arcing contacts, the arcing volume being actively connected to at least one exhaust having an exhaust volume which is constructed for cooling hot gases generated during breaking operations and is connected to a volume of the interrupting chamber, wherein in the area of the exhaust at least one forcibly created recirculation area is provided which increases the flow resistance of the hot gases, wherein
• the hot gases flow from the arcing volume into an intermediate volume,
• following the intermediate volume, a flow tube constructed in the manner of a laval nozzle and having a nozzle constriction leads into the exhaust volume which is connected to the interrupting chamber volume,
• in the intermediate volume, at least one baffle plate protruding into the flow of the hot gases is provided, downstream of which a first recirculation area forms, and
• the baffle plate is preceded upstream at a distance A by a perforated plate which is provided with openings which have a diameter D1.

A circuit breaker which has in an enclosure filled with an insulating gas at least one interrupting chamber extending along a longitudinal axis comprising:

• an arcing volume;
• and
• at least two associated arcing contacts, the arcing volume being actively connected to at least one exhaust having an exhaust volume which is constructed for cooling hot gases generated during breaking operations and is connected to a volume of the interrupting chamber, wherein in the area of the exhaust at least one forcibly created recirculation area is provided which increases the flow resistance of the hot gases, wherein
• the hot gases flow from the arcing volume into an intermediate volume,
• following the intermediate volume, a flow tube constructed in the manner of a laval nozzle and having a nozzle constriction leads into the exhaust volume which is connected to the interrupting chamber volume,
• in the intermediate volume, at least one baffle plate protruding into the flow of the hot gases is provided, downstream of which a first recirculation area forms,
• the baffle plate is provided with narrow notches of equal depth and distributed uniformly around the circumference, and
• the wings remaining between the notches are constructed to be bent over in the manner of a wind wheel.