Extinguishing chamber for an electric protection apparatus and electric protection apparatus comprising one such chamber

摘要

An arc extinguishing chamber includes an arc formation chamber containing a stationary contact and a movable contact which form an arc between them when separated. The arc formation chamber communicates with an inlet of a second chamber. A separating wall is placed in a volume downstream from said second chamber. The wall extends in the direction of the gas flow to partition the volume in the direction of the flow of the gases and exhaust outlets enabling the quenching gases to be removed outside of the apparatus. The separating wall(s) extend(s) in such a way as to partition in the direction of the flow to the outlets and to thereby form at least a first removal duct and a second removal duct, said ducts each being associated with an exhaust outlet and enabling a substantially complete separation to be achieved between a first flow and a second flow.

主权项

1. An arc extinguishing chamber for an electric protection apparatus comprising:
an arc formation chamber containing a stationary contact and a movable contact which, at a moment the stationary contact and the movable contact separate from each other, form an arc between the stationary contact and the movable contact, said arc formation chamber communicating with an inlet of a second chamber, at least one separating wall placed in a volume situated downstream from said second chamber, said at least one separating wall extending in a direction of the gas flows so as to perform partitioning of the volume in the direction of the gas flows and at least one exhaust outlet quenching gases to be removed to the outside of the electric protection apparatus; and two partitions substantially perpendicular to one another and forming a step, said step being arranged in a first removal duct so as to form a salient volume in the first removal duct and at the same time to increase a length of a path of the gas flows in the first removal duct, and to form a recessed volume in a second removal duct, the gas flows flowing in the first removal duct above the step whereas the gas flows flow in the second removal duct underneath the step, wherein the at least one separating wall extends in such a way as to form a substantially complete partitioning in the direction of the gas flows to the at least one exhaust outlet and to thereby form at least the first removal duct and the second removal duct, said ducts each being associated with the at least one exhaust outlet and achieving a substantially complete separation between a first flow of the gas flows and a second flow of the gas flows, said first and second flows being emitted at the at least one exhaust outlet of the arc extinguishing chamber and respectively flowing in the first removal duct and second removal duct, the at least one exhaust outlet and the arc extinguishing chamber being arranged with respect to one another in such a way that the gas flows exit from the arc extinguishing chamber in a substantially perpendicular direction to the direction in which the gas flows exit from the electric protection apparatus via the at least one exhaust outlet, and wherein a cross-section of each removal duct decreases continuously from an exhaust duct opening to the at least one exhaust outlet.