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Title:
VACUUM PUMP
Document Type and Number:
WIPO Patent Application WO/1999/042729
Kind Code:
A1
Abstract:
A vacuum pump comprising a housing (11), rotor shafts (23, 24) supported on the housing (11) at its both ends, and rotors (21, 22) which are rotated integrally with the rotor shafts (23, 24) inside a rotor chamber (14) to suck compressible fluid from a suction port (12) into the rotor chamber (14) and compress it for discharging through a discharge port (13), wherein cooling paths (41, 42) having external paths (41a, 42a) and internal paths (41b, 42b) open on one side of the rotor shafts (23, 24), respectively, and formed by connecting these both paths in a loopback form inside the rotors (21 and 22), respectively, are provided in the rotor shafts (23 and 24), respectively. With such a configuration, a temperature rise on the discharge port side can be suppressed, and continuous operation can be performed even if the capacity, speed, and compression ratio are increased.

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Inventors:
Fukui, Kiyozumi (1-19, Minamikarasuyama 5-chome Setagaya-ku Tokyo, 157-0062, JP)
Application Number:
PCT/JP1999/000739
Publication Date:
August 26, 1999
Filing Date:
February 19, 1999
Export Citation:
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Assignee:
TEIJIN SEIKI CO., LTD. (9-1 Edobori 1-chome Nishi-ku Osaka-shi Osaka, 550-0002, JP)
Fukui, Kiyozumi (1-19, Minamikarasuyama 5-chome Setagaya-ku Tokyo, 157-0062, JP)
International Classes:
F04C25/02; F04C18/16; F04C27/00; F04C29/00; F04C29/04; (IPC1-7): F04C29/04; F04C18/16; F04C25/02
Foreign References:
JPH02245493A
JPH03995A
JPS6155187U
JPS4983008A
JPS63117192A
Attorney, Agent or Firm:
Miyakoshi, Noriaki (Miyakoshi Patent Office Reinanzaka - annex - 2F 11-3, Akasaka 1-chome Minato-ku Tokyo, 107-0052, JP)
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