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Title:
PUMP AND WATER JET PROPULSION UNIT
Document Type and Number:
Japanese Patent JP2014181016
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To improve the suction performance of a pump by suppressing cavitation produced by high-revolution operation of an impeller in a pump, e.g. a mixed flow pump or an axial flow pump.SOLUTION: A pump is provided with an impeller 8 having a plurality of impeller blades 14 which delivers a liquid in the axial direction from the upstream side to the downstream side by rotating around an axis line O. The cord length L of each impeller blade 14 increases gradually from the end part of the radial-direction inner side toward the end part of the radial-direction outer side, and the rear edge 14d of each impeller blade 14 has no part inclined toward the upstream side between the end part of the radial-direction inner side and the end part of the radial-direction outer side. A water jet propulsion unit provided with the pump is also provided.

Inventors:
FUKAO SHINJI
Application Number:
JP2013058620A
Publication Date:
September 29, 2014
Filing Date:
March 21, 2013
Export Citation:
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Assignee:
MITSUBISHI HEAVY IND LTD
International Classes:
B63H11/103; B63H11/08; F04D3/02; F04D29/18; F04D29/66
Domestic Patent References:
JPH0466386A1992-03-02
JP2002087385A2002-03-27
JPH01175596A1989-07-12
JPH0466386A1992-03-02
Foreign References:
US20050070178A12005-03-31
Attorney, Agent or Firm:
Woods Ryuichiro
Masatake Shiga
Norio Takahashi
Tetsuo Yamazaki
Yasushi Matsunuma