Global Patent Index - EP 1020645 A1

EP 1020645 A1 2000-07-19 - 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

EP 1020645 A1 (EN)

Application

EP 99124197 A

Priority

JP 413699 A

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 (main, further and additional classification)

F04C 11/00

IPC 8 full level (invention and additional information)

F04C 18/18 (2006.01); F04C 2/08 (2006.01); F04C 2/18 (2006.01); F04C 11/00 (2006.01)

CPC (invention and additional information)

F04C 11/001 (2013.01); F04C 2/086 (2013.01)

Citation (search report)

Designated contracting state (EPC)

DE FR NL

EPO simple patent family

EP 1020645 A1 20000719; JP 2000205148 A 20000725; KR 20000052324 A 20000816

INPADOC legal status


2001-07-18 [18W] WITHDRAWN

- Date of withdrawal: 20010525

2001-04-04 [AKX] PAYMENT OF DESIGNATION FEES

- Free text: DE FR NL

2000-07-19 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 19991203

2000-07-19 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): DE FR NL

2000-07-19 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

- Free text: AL;LT;LV;MK;RO;SI