Global Patent Index - EP 1021654 A1

EP 1021654 A1 2000-07-26 - SCREW VACUUM PUMP PROVIDED WITH ROTORS

Title (en)

SCREW VACUUM PUMP PROVIDED WITH ROTORS

Title (de)

SCHRAUBENVAKUUMPUMPE MIT ROTOREN

Title (fr)

POMPE A VIDE A VIS POURVUE DE ROTORS

Publication

EP 1021654 A1 (DE)

Application

EP 98937515 A

Priority

  • DE 19745615 A
  • EP 9803757 W

Abstract (en)

[origin: DE19745615A1] Each of the rotors (5) has at least two sections (17,18) with different rotor profiles (19,20). The suction side section has a greater diameter than the pressure-side section. The suction-side section is produced with a greater tolerance than the pressure-side section. Rotor cooling apparatus is situated in a bearing-side open cavity (31) in the rotor.

IPC 1-7 (main, further and additional classification)

F04C 18/16; F04C 18/08; F04C 23/00; F04C 29/04; F04C 29/10

IPC 8 full level (invention and additional information)

F04C 18/16 (2006.01); F04C 18/08 (2006.01); F04C 23/00 (2006.01); F04C 25/02 (2006.01); F04C 28/26 (2006.01); F04C 29/00 (2006.01); F04C 29/04 (2006.01)

CPC (invention and additional information)

F04C 28/26 (2013.01); F04C 18/084 (2013.01); F04C 23/001 (2013.01); F04C 23/008 (2013.01); F04C 29/04 (2013.01); F04C 18/16 (2013.01); F04C 2220/10 (2013.01)

Citation (search report)

See references of WO 9919631A1

Designated contracting state (EPC)

CH DE FR GB IT LI

DOCDB simple family

DE 19745615 A1 19990415; EP 1021654 A1 20000726; EP 1021654 B1 20041006; JP 2001520353 A 20011030; JP 4146081 B2 20080903; KR 20010030995 A 20010416; TW 452631 B 20010901; US 6382930 B1 20020507; WO 9919631 A1 19990422