Title:
VACUUM PUMPING ARRANGEMENT
Document Type and Number:
WIPO Patent Application WO2005059367
Kind Code:
A3
Abstract:
A regenerative pumping mechanism (104) comprises a rotor having a series of blades positioned in an annular array on one side of the rotor (122), and a stator (108) having an annular channel within which the blades rotate. In order to control the axial clearance (C) between the rotor (122) and the stator (108), an axial magnetic bearing (140) actively controls relative axial movement between the rotor (122) and the stator (108). This can allow the pumping mechanism to provide controllable axial sealing between the rotor (122) and the stator, as opposed to radial sealing.
Inventors:
SCHOFIELD NIGEL PAUL (GB)
Application Number:
PCT/GB2004/005211
Publication Date:
November 16, 2006
Filing Date:
December 08, 2004
Export Citation:
Assignee:
BOC GROUP PLC (GB)
SCHOFIELD NIGEL PAUL (GB)
SCHOFIELD NIGEL PAUL (GB)
International Classes:
F04D23/00; F04D19/04; F04D29/04; F04D29/048; F04D29/08
Foreign References:
| EP1065383A1 | 2001-01-03 | |||
| US3356033A | 1967-12-05 | |||
| US3518021A | 1970-06-30 | |||
| US5137418A | 1992-08-11 |
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