Gas-blast switch

Claim 2

A gas-blast switch comprising a stationary contact element, a movable contact element, a blast nozzle movable along with the movable contact element and surrounding said movable contact element, said blast nozzle having an inlet side and an outlet diffuser, means defining a compression compartment for an extinguishing gas, the inlet side of the blast nozzle being in flow communication with the compression compartment for the extinguishing gas and which compression compartment can be placed under pressure by a cut-off movement of the switch, an electrically conductive screening body guided along the stationary contact element, said electrically conductive screening body being displaceable by means of the blast nozzle during a cut-on movement of the switch out of its position where it surrounds the stationary contact element in the switch cut-off position, a jacket compartment through which extinguishing gas can be blown through in the switch cut-off position provided between the stationary contact element and the screening body, said jacket compartment having an inlet side possessing an inner diameter which practically aligns with a blast cone formed by the outlet diffuser of the blast nozzle.

Claim 3

A gas-blast switch comprising a stationary contact element, a movable contact element, a blast nozzle movable along with the movable contact element and surrounding said movable contact element, said blast nozzle having an inlet side and an outlet diffuser, means defining a compression compartment for an extinguishing gas, the inlet side of the blast nozzle being in flow communication with the compression compartment for the extinguishing gas and which compression compartment can be placed under pressure by a cut-off movement of the switch, an electrically conductive screening body guided along the stationary contact element, said electrically conductive screening body being displaceable by means of the blast nozzle during a cut-on movement of the switch out of its position where it surrounds the stationary contact element in the switch cut-off position, a jacket compartment through which extinguishing gas can be blown through in the switch cut-off position provided between the stationary contact element and the screening body, said jacket compartment having an inlet side possessing an inner diameter which practically aligns with a blast cone formed by the outlet diffuser of the blast nozzle, the screening body possessing at least one ring member which is substantially coaxially arranged with respect to the stationary contact element, a plurality of rods which extend away from said movable contact element, said ring member being suspended at said rods.

Claim 4

A gas-blast switch comprising a stationary contact element, a movable contact element, a blast nozzle movable along with the movable contact element and surrounding said movable contact element, said blast nozzle having an inlet side and an outlet diffuser, means defining a compression compartment for an extinguishing gas, the inlet side of the blast nozzle being in flow communication with the compression compartment for the extinguishing gas and which compression compartment can be placed under pressure by a cut-off movement of the switch, an electrically conductive screening body guided along the stationary contact element, said electrically conductive screening body being displaceable by means of the blast nozzle during a cut-on movement of the switch out of its position where it surrounds the stationary contact element in the switch cut-off position, a jacket compartment through which extinguishing gas can be blown through in the switch cut-off position provided between the stationary contact element and the screening body, said jacket compartment having an inlet side possessing an inner diameter which practically aligns with a blast cone formed by the outlet diffuser of the blast nozzle, the screening body possessing at least one ring member which is substantially coaxially arranged with respect to the stationary contact element, a plurality of rods which extend away from said movable contact element, said ring member being suspended at said rods.

Claim 5

The gas-blast switch as defined in claim 2, wherein the stationary contact element includes a free end, the ring member in the switch cut-off position together with the free end of the stationary contact element being substantially located in one plane.

Claim 6

The gas-blast switch as defined in claim 2, wherein the stationary contact element includes a free end, the blast nozzle having a free end confronting the free end of the stationary contact element, and wherein in the cut-off position of the switch the plane of the ring member is located between the free end of the stationary contact element and the confronting free end of the blast nozzle.

Claim 7

The gas-blast switch as defined in claim 2, wherein the ring member possesses a cross-sectional shape which is rounded at all sides and which is extended in its plane, said ring member having an inside portion which forms the inner surface of the ring member, said inside portion possessing substantially the same divergence as said outlet diffuser of the blast nozzle.

Claim 8

The gas-blast switch as defined in claim 2, wherein the ring member possesses a cross-sectional shape which is roundEd at all sides and which is extended in its plane, said ring member having an inside portion which forms the inner surface of the ring member, said inside portion possessing a greater divergence than said outlet diffuser of the blast nozzle.

Claim 9

The gas-blast switch as defined in claim 2, wherein said blast an outlet side, the inner diameter of the ring member is greater than the largest inner member of said outlet diffuser but smaller than the external diameter of the outlet side of the blast nozzle.

Claim 10

The gas-blast switch as defined in claim 1, wherein the blast nozzle possesses a throat portion, said throat portion of the blast nozzle being arranged forwardly of the movable contact element in the direction of the stationary contact element, said throat portion having an inner diameter which practically corresponds to the outer diameter of the stationary contact element.

Claim 11

The gas-blast switch as defined in claim 2, wherein the blast nozzle possesses a nozzle body having an outer diameter which is stepped to a diameter substantially corresponding to the inner diameter of the ring member in order to form a stop and entrainment shoulder for said ring member.