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Title:
SUCTION CASING, SUCTION PASSAGE STRUCTURE AND FLUID MACHINE
Document Type and Number:
Japanese Patent JP2005320869
Kind Code:
A
Abstract:

To effectively prevent localizing of a cavitation generation area and simplify a configuration of an inner flow passage concerning a prewhirl type suction casing used for sucking fluid into a fluid machine and causing a swirling flow of the fluid.

The suction casing 3 has the inner flow passage 4 connected to a suction passage 2 which is provided upstream orthogonally to a rotation axis 1 of the fluid machine. The inner flow passage 4 is formed in a spiral shape for causing the swirling flow of the fluid in a state orthogonal to the rotation axis. A straightening plate 12 is provided in the inner flow passage of the suction casing. The straightening plate bears a straightening function of dividing a flow rate of the swirling fluid flow in the inner flow passage between a whirl center side and a whirl outer periphery side and a straightening function of causing tuning of the fluid in a swirling direction of the swirling fluid flow by the inner flow passage. These straightening functions make a smoothly swirling flow easy to form in the inner flow passage and prevents localizing of the cavitation generation area.


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Inventors:
INOUE YASUHIRO
AKI TAKASHI
KAWABATA SEIJI
TANAKA TEIJI
Application Number:
JP2004137513A
Publication Date:
November 17, 2005
Filing Date:
May 06, 2004
Export Citation:
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Assignee:
HITACHI IND CO LTD
International Classes:
F04D29/44; F04D29/66; (IPC1-7): F04D29/44; F04D29/66
Domestic Patent References:
JPH10220396A1998-08-18
JPS603500A1985-01-09
JPS56135756A1981-10-23
JPS6344960B21988-09-07
JPS6149195A1986-03-11
JPS56126685A1981-10-03
JPS6282300A1987-04-15
JPH11148498A1999-06-02
JPS51142101A1976-12-07
Foreign References:
FR982583A1951-06-12
Attorney, Agent or Firm:
高崎 芳紘