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Title:
LIQUID PUMP AND LIQUID PUMP SYSTEM
Document Type and Number:
Japanese Patent JP2009197648
Kind Code:
A
Abstract:

To provide a liquid pump and a liquid pump system comprising simple and original performance and suitable for precedent stand-by operation.

This liquid pump 10 comprises a pump body 30, a fixed pipe 20 and an air flow-in mechanism 28. The pump body 30 has impellers 31, a motor 33 for rotating the impellers 31, and an impeller casing 34 surrounding to cover the impellers 31 around the rotating direction. The fixed pipe 20 has a cylindrical column pipe 21 in which the pump body 30 is housed freely to be put in and pulled out, and a suction pipe 25 fitted to a lower end of the column pipe 21 so that liquid flows upward toward the impeller 31. The fixed pipe 20 forms a lower gap 11 vertically under the impeller housing 34, and forms a side gap 12 communicating with the inside of the impeller casing 34 through the lower gap 11 outside in the horizontal direction. The air flow-in mechanism 28 supplies air to the side gap 12.


Inventors:
Takashima, Michio
Suzuki, Shinji
Uchida, Yoshihiro
Fujino, KO
Shimizu, Osamu
Onodera, Yoshihiko
Nakashio, Yuji
Application Number:
JP2008000038891
Publication Date:
September 03, 2009
Filing Date:
February 20, 2008
Export Citation:
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Assignee:
EBARA CORP
EBARA YOSHIKURA HYDRO-TECH CO LTD
International Classes:
F04D13/00; F04D13/16; F04D29/70
Domestic Patent References:
JP2004308508A
JP2004204834A
JP2004239215A
JPH04350396A1992-12-04
JPH05133379A
JPH04272496A
JPH10169589A
JP2004308508A
JP2004204834A
JP2004239215A
JPH04350396A1992-12-04
JPH05133379A
JPH04272496A
JPH07247987A
Attorney, Agent or Firm:
宮川 貞二
金井 俊幸
宮川 清
柴田 茂夫
吉村 裕子
加藤 治彦
金子 美代子