EP 0988453 A1 20000329 - SCREW SPINDLE VACUUM PUMP AND OPERATING METHOD
Title (en)
SCREW SPINDLE VACUUM PUMP AND OPERATING METHOD
Title (de)
SCHRAUBENSPINDELVAKUUMPUMPE UND VERFAHREN ZUM BETRIEB DERSELBEN
Title (fr)
POMPE A VIDE A VIS ET SON PROCEDE DE FONCTIONNEMENT
Publication
Application
Priority
- DE 19724643 A 19970611
- EP 9803544 W 19980609
Abstract (en)
[origin: DE19724643A1] 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.
IPC 1-7
IPC 8 full level
F04C 18/16 (2006.01); F04C 25/02 (2006.01); F04C 29/00 (2006.01); F04C 29/04 (2006.01)
CPC (source: EP KR US)
F04C 29/04 (2013.01 - EP KR US); F04C 2240/402 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB IE IT LI NL PT SE
DOCDB simple family (publication)
US 6273696 B1 20010814; AT E247780 T1 20030915; CA 2293618 A1 19981217; CA 2293618 C 20070918; DE 19724643 A1 19981217; DE 59809350 D1 20030925; DK 0988453 T3 20031215; EP 0988453 A1 20000329; EP 0988453 B1 20030820; ES 2206958 T3 20040516; JP 2002504205 A 20020205; JP 4002304 B2 20071031; KR 100340166 B1 20020610; KR 20010013629 A 20010226; KR 20010013692 A 20010226; NO 327604 B1 20090831; NO 996129 D0 19991210; NO 996129 L 19991210; PT 988453 E 20040130; WO 9857067 A1 19981217; ZA 984959 B 19990412
DOCDB simple family (application)
US 44570599 A 19991209; AT 98934953 T 19980609; CA 2293618 A 19980609; DE 19724643 A 19970611; DE 59809350 T 19980609; DK 98934953 T 19980609; EP 9803544 W 19980609; EP 98934953 A 19980609; ES 98934953 T 19980609; JP 50163099 A 19980609; KR 19997011639 A 19991210; KR 19997011707 A 19991211; NO 996129 A 19991210; PT 98934953 T 19980609; ZA 984959 A 19980609