| 摘要 |
Frictionless positive-displacement rotary dry vacuum pump in which a gaseous flow G, at a pressure close to that of the delivery and at a temperature below the temperature of the gas at the delivery from the pump, is injected cyclically into the stator (1) of the machine in transfer volumes (10, 11) during the phases of the cycle in which these volumes are isolated both from the intake (4) and from the delivery (5), characterised in that the said injection of gaseous flow is performed in the stator of the pump through zones (12, 13) made of porous material. <IMAGE>
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