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Patent Searching and Data


Title:
VANE TYPE VACUUM PUMP
Document Type and Number:
WIPO Patent Application WO/2004/036046
Kind Code:
A1
Abstract:
A vane type vacuum pump having a rotor (34) for rotating a vane (42) while sliding it on a housing (21) and provided concentrically with a rotary shaft (31) between the housing and the rotor, substantially over the entire circumference, with a labyrinth−like seal having at least a set of circular circumferential groove (44) and a circular circumferential protrusion (43) fitted to move relatively in the circumferential direction. The protrusion or the groove is continuous on the housing side but discontinuous on the rotor side so that it does not impede radial movement of the vane and the vane is provided with a clearance (49).

Inventors:
Kusumoto, Katsuhiko c/o Mitsubishi Denki Kabushiki Kaisha (2-3 Marunouchi 2-chom, Chiyoda-ku Tokyo, 100-8310, JP)
Onoue, Shigeru c/o Mitsubishi Denki Kabushiki Kaisha (2-3 Marunouchi 2-chom, Chiyoda-ku Tokyo, 100-8310, JP)
Application Number:
PCT/JP2002/010661
Publication Date:
April 29, 2004
Filing Date:
October 15, 2002
Export Citation:
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Assignee:
MITSUBISHI DENKI KABUSHIKI KAISHA (2-3 Marunouchi 2-chome, Chiyoda-ku, Tokyo, 100-8310, JP)
International Classes:
F01C21/08; F01C21/10; F04C18/344; F04C25/02; F04C27/00; (IPC1-7): F04C18/344; F04C25/02
Foreign References:
JPH07317674A
JPH07279678A
JP2947030B2
JP2002161881A
Other References:
See also references of EP 1553301A1
Attorney, Agent or Firm:
Soga, Michiteru (S. Soga & Co, 8th Floor Kokusai Building, 1-1, Marunouchi 3-chom, Chiyoda-ku Tokyo, 100-0005, JP)
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