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US 5,040,949 AGranted
Two stage dry primary pump
AssigneeAlcatel Cit
InventorsJean-Marie Crinquette, Jacques Long
Life of this patent
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Abstract
A two stage dry primary pump comprises, in a single common stator: a screw pump at its low pressure end; and a fluid viscous effect, single rotary screw gas exhaust pump at its high pressure end; with a link duct providing communication between the screw pump and the viscous effect, single rotary screw gas exhaust pump. The invention is applicable to vacuum pumps.
Claims6
A two stage dry primary pump comprising, in a single common stator:
- a screw pump at its low pressure end;
- and a viscous effect, single rotary screw gas exhaust pump at its high pressure end;
- and a link duct providing communication between the screw pump and the viscous effect, single rotary screw gas exhaust pump.
Dependencies are inferred from the claim text.