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Patent Searching and Data


Title:
PUMP
Document Type and Number:
Japanese Patent JP2007016750
Kind Code:
A
Abstract:

To provide a pump capable of being stably started without exerting shaft thrust on a rotor at starting and causing the problem that a bearing is damaged by the shaft thrust at starting.

The pump comprises a thrust balancing mechanism 19. On the suction side of a pump rotating shaft 12, a balancing mechanism 30 is provided for exerting force in the opposite direction to the shaft thrust which is exerted on the rotating shaft of the pump, in accordance with static pressure generated by the rotation of a suction stage impeller 15 of the pump. Preferably, the static pressure generated by the rotation of the suction stage impeller of the pump is taken out of the suction stage impeller near its outer periphery 15a.


Inventors:
MATSUMURA MASAO
Application Number:
JP2005201641A
Publication Date:
January 25, 2007
Filing Date:
July 11, 2005
Export Citation:
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Assignee:
EBARA CORP
International Classes:
F04D15/00
Domestic Patent References:
JPS60118392A1985-06-25
JPS5032161Y1
JPH0213197A1990-01-17
JPS5920879B21984-05-16
JPS61144293A1986-07-01
Attorney, Agent or Firm:
Isamu Watanabe
Shintaro Hotta
Ryoji Kosugi
Tomohiro Mori
Tetsuya Hirosawa