Gas exhaust for circuit breaker

Abstract

The gas exhaust comprises a generally cylindrical shaped casing (26) closed by a bottom (18, 22) at one end and with openings (30) to allow gas to escape. A duct (16) is arranged in the casing (26) to delimit a central passage inside the duct, and an annular passage (42) surrounding the central passage (40) outside the duct between it and the casing (26). There is a communication consisting of four holes (20) in the duct (16) close to the bottom (18) to form a communication between the central passage (40) inside the duct (16) and the annular passage (42). The casing (26) includes two diametrically opposite openings (30) located in a horizontal plane.

Description

Other specific features and advantages of the invention will become clearer after reading the following description of an example embodiment given for illustrative purposes with reference to the appended drawings wherein:

FIG. 1 shows a sectional elevation view of a circuit breaker comprising a gas exhaust according to this invention;

FIG. 2 shows a horizontal sectional view of the circuit breaker in FIG. 1;

FIG. 3 shows a larger scale perspective view of part of the exhaust according to the invention;

FIGS. 4, 5 and 6 show detailed views that show openings formed in the casing and the shape of the radial partitions;

FIG. 7 shows a sectional view of a circuit breaker according to prior art. FIGS. 1 and 2 diagrammatically show an electrical breaking device such as a circuit breaker.

Claims

1. Gas exhaust for a circuit breaker, comprising a generally cylindrical shaped casing (26) closed by a bottom (18, 22) at one end and with openings (30) to allow gas to escape, a duct arranged in the casing (26) to delimit a central passage inside the duct, and an annular passage (42) surrounding the central passage (40) outside the duct between it and the casing (26), a communication (20) being provided in the duct (16) close to the bottom (18) to form a communication between the central passage (40) inside the duct (16) and the annular passage (42), characterised in that the casing (26) includes two diametrically opposite openings (30) located in a horizontal plane.

2. Exhaust according to claim 1, characterised in that the passage cross-section available to the gas is monotonous and progressively increasing.

3. Exhaust according to claim 2, characterised in that the cross-section passage available to the gas does not vary by a factor of more than four at each increase in cross-section.

4. Exhaust according to claim 1, characterised in that the two openings (30) formed in the casing (26) are spaced by at a given distance from a bottom (44 of the annular passage (42) and four radial partitions (32, 34, 36, 38) are provided firstly to provide a surround around the openings (30) formed in the casing (26) and secondly to delimit isolated gas passages from openings (30) so as to force the gas to travel as far as the bottom of the annular passage (42) before it can escape through the openings (30).

5. Exhaust according to claim 1, characterised in that the openings (30) formed in the casing (26) extend around about a third of the periphery of the casing.

6. Exhaust according to claim 1, characterised in that the communication provided in the duct (16) close to the bottom (18) to create a communication between the central passage (40) in the duct (16) and the annular passage (42) passage consists of four holes (20).