EP 1006281 A1 20000607 - Multi-stage roots pump
Title (en)
Multi-stage roots pump
Title (de)
Mehrstufige Roots-Pumpe
Title (fr)
Pompe Roots multiétagée
Publication
Application
Priority
JP 34501198 A 19981204
Abstract (en)
A multi-stage Roots pump has a plurality of parallel pump chambers formed in the casing thereof. Each pump chamber has a pair of rotors arranged therein for rotation to effect a pumping action, an intake port and an exhaust port. Exhaust ports of pump chambers of the preceding stages are connected to intake ports of pump chambers of the succeeding stages through communication holes, one after another, in series. The communication hole extends across an imaginary plane that include the axes of shafts and is perforated in the casing between the shafts so that the communication hole does not contact the shafts. <IMAGE>
IPC 1-7
IPC 8 full level
F04C 2/08 (2006.01); F04C 18/12 (2006.01); F04C 18/18 (2006.01); F04C 23/00 (2006.01); F04C 25/02 (2006.01); F04C 29/00 (2006.01); F04C 29/12 (2006.01)
CPC (source: EP KR)
F04C 2/08 (2013.01 - KR); F04C 18/126 (2013.01 - EP); F04C 23/001 (2013.01 - EP)
Citation (search report)
- [A] GB 2088957 A 19820616 - BOC LTD
- [A] EP 0476631 A1 19920325 - EBARA CORP [JP]
- [A] DE 19503716 C1 19960328 - K BUSCH GMBH DRUCK & VAKUUM DR [DE]
- [A] PATENT ABSTRACTS OF JAPAN vol. 011, no. 183 (M - 598) 12 June 1987 (1987-06-12)
Designated contracting state (EPC)
DE FR NL
DOCDB simple family (publication)
EP 1006281 A1 20000607; JP 2000170679 A 20000620; KR 20000047492 A 20000725; TW 436585 B 20010528
DOCDB simple family (application)
EP 99123818 A 19991201; JP 34501198 A 19981204; KR 19990040101 A 19990917; TW 88115060 A 19990901