Screw spindle vacuum pump and operating method

Details Screw spindle vacuum pump and operating method Screw spindle vacuum pump and operating method

F - Mech Eng,Light,Heat,Weapons

04

C

F04C 29/04 (2006.01) F04C 18/16 (2006.01) F04C 29/00 (2006.01)

Patent

CA 2293618

The invention relates to a screw spindle vacuum pump with at least three sealed-off pumping chambers fitted one behind the other along each rotor. The invention also relates to a method for operating this compressor. Shortly before it opens onto delivery side of the pump, the last chamber on delivery side is brought almost to final compression pressure by preadmission. This is achieved by supplying a preadmission current at least five times greater than the suction mass flow rate. For this, the minimum ratio of outer compression to inner compression must be five.

L'invention concerne une pompe à vide à vis comportant au moins trois chambres de refoulement isolées, placées l'une à la suite de l'autre le long de chaque rotor, et un procédé de fonctionnement de ce compresseur. La dernière chambre côté pression est mise pratiquement à la pression finale de compression par préadmission, peu de temps avant son ouverture vers le côté pression. A cet effet est acheminé un flux de préadmission au moins cinq fois supérieur au flux massique d'aspiration, le rapport minimal entre la compression intérieure et extérieure devant être égal à cinq.

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