EP 1020645 A1 20000719 - Multi-stage Roots pump and method of producing the housing
Title (en)
Multi-stage Roots pump and method of producing the housing
Title (de)
Mehrstufige Rootspumpe und Verfahren zur Herstellung des Gehäuses
Title (fr)
Pompe Roots multiétagée et procédé de fabrication du boîtier
Publication
Application
Priority
JP 413699 A 19990111
Abstract (en)
The multi-stage Roots pump has a rotor housing having a plurality of axially spaced pump chambers (39-43). A set of rotors (23-32) are arranged on respective shafts (19,20) in mesh with each other and accomodated in each of the pump chambers. The rotor housing includes a cylinder block (11) and a plurality of partition walls (33-36) formed separately from and coupled to the cylinder block to divide the cylinder block into the pump chambers. The cylinder block includes a plurality of block elements (17,18) parted along lines (L) extending parallel to the axes of the shafts and joined together so as to form inner circumferential surfaces of the pump chambers. The block elements and the partition walls form, in combination, the rotor housing. <IMAGE>
IPC 1-7
IPC 8 full level
F04C 18/18 (2006.01); F04C 2/08 (2006.01); F04C 2/18 (2006.01); F04C 11/00 (2006.01)
CPC (source: EP KR)
F04C 2/086 (2013.01 - EP); F04C 11/001 (2013.01 - EP); F04C 18/18 (2013.01 - KR)
Citation (search report)
- [XY] EP 0480629 A1 19920415 - BOC GROUP PLC [GB]
- [Y] US 4328824 A 19820511 - KIERNAN JAMES G, et al
- [Y] US 4531535 A 19850730 - KIERNAN JAMES G [US], et al
Designated contracting state (EPC)
DE FR NL
DOCDB simple family (publication)
EP 1020645 A1 20000719; JP 2000205148 A 20000725; KR 20000052324 A 20000816
DOCDB simple family (application)
EP 99124197 A 19991203; JP 413699 A 19990111; KR 19990038696 A 19990910