| 摘要 |
A gas-blast switch having a movable contact element and a stationary contact element and a blast nozzle operatively associated with one of the contact elements and surrounding the same. The blast nozzle, during the course of the cut-off stroke of the gas-blast switch, is connected with a pump chamber or compartment which can be placed under pressure. The nozzle chamber is constituted by an inlet space converging towards the nozzle throat and an outlet space diverging away from such throat. In the blast nozzle there are additionally formed channels which flow communicate with the pump chamber. These channels open at an angle with respect to the nozzle axis into the nozzle chamber in order to additionally cause a blowing of the arc transversely in addition to the axial blowing of the arc in the blast nozzle. To obtain as low as possible flow losses of the extinguishing gas flowing through the channels, the latter are structured in the form of inwardly open grooves which extend essentially axially or obliquely with respect to the lengthwise axis of the blast nozzle and start from the converging inlet space or chamber. The base of the grooves extends linearly or is curved in the manner of guide buckets or blades and has a starting portion extending in the inlet space essentially parallel to the flow direction as well as an end section directed towards the nozzle axis and arranged downstream of the throat.
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