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Patent Searching and Data


Title:
ROTARY JOINT FOR LOW-TEMPERATURE APPLICATION
Document Type and Number:
WIPO Patent Application WO/2010/140627
Kind Code:
A1
Abstract:
A small-sized lightweight rotary joint for low-temperature application. A rotary joint for low-temperature application comprises: a housing (2); a non-rotation refrigerant pipe (3) provided within the housing (2) and having one end connected to the outside refrigerant source and the other end communicated with a portion to be cooled within a rotary machine; a rotatable rotation member (4) provided within the housing (2), having the refrigerant pipe (3) loosely inserted therethrough, and having one end affixed to the rotation section of the rotary machine; and a cylindrical relative rotation member (5) coaxial with both the refrigerant pipe (3) and the rotation member (4), having an affixed-side member (5a) affixed to the inner surface of the housing (2), and having a rotation-side member (5b) disposed so as to be rotatable inside the affixed-side member (5a). The affixed-side member (5a) is connected to the refrigerant pipe (3) through a refrigerant-pipe extension section (3a), and the rotation-side member (5b) is connected to the rotation member (4) through a rotation-member extension section (4a). The space (7) between the refrigerant pipe (3) and the rotation member (4) and the space (8) between the refrigerant-pipe extension section (3a) and the rotation-member extension section (4a) form a refrigerant region. A seal member (10) is provided between the affixed-side member (5a) and the rotation-side member (5b). A vacuum chamber and a pressure chamber are defined within the housing (2) by the peripheral wall of the refrigerant pipe (3), the refrigerant-pipe extension section (3a), and the affixed-side member (5a) of the relative rotation member (5).

Inventors:
IZUMI MITSURU (JP)
MIKI MOTOHIRO (JP)
KITANO MASAHIRO (JP)
Application Number:
PCT/JP2010/059365
Publication Date:
December 09, 2010
Filing Date:
June 02, 2010
Export Citation:
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Assignee:
UNIV TOKYO NAT UNIV CORP (JP)
KITANO SEIKI CO LTD (JP)
IZUMI MITSURU (JP)
MIKI MOTOHIRO (JP)
KITANO MASAHIRO (JP)
International Classes:
F16L27/08; F16C19/08; F16J15/43
Domestic Patent References:
WO2006080280A12006-08-03
Foreign References:
JPH0851767A1996-02-20
JP2003065477A2003-03-05
JP2006095616A2006-04-13
Other References:
See also references of EP 2439438A4
Attorney, Agent or Firm:
KATSUNUMA, Hirohito et al. (JP)
Katsunuma Hirohito (JP)
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