Title:
VERTICAL SHAFT PUMP AND PUMPING DEVICE
Document Type and Number:
Japanese Patent JP3188997
Kind Code:
B2
Abstract:
PURPOSE: To reduce the consumption power in a preceding stand-by operation of a pump, by making it possible to carry out a pumping operation even in case of the low water level in a water supply tank.
CONSTITUTION: A ventilating hole 15 opened at the top of a pump discharge pipe 7 is provided, and a bypass pipe 16 whose one end is connected to the ventilating hole 15 and the other end 19 is opened at the upper position upper than a scheduled highest water level of a discharge water tank is provided. Consequently, a delay of the starting of a pumping (drainage) is eliminated, the load applied to an impeller is reduced, and a consumption power in the stand-by operation can be reduced, and furthermore, a water temperature rise in a pumping pipe can be suppressed.
Inventors:
Akira Yamaguchi
Shiro Matsui
Shigeyoshi Ono
Shiro Matsui
Shigeyoshi Ono
Application Number:
JP20700394A
Publication Date:
July 16, 2001
Filing Date:
August 31, 1994
Export Citation:
Assignee:
株式会社日立製作所
株式会社 ティーテック
株式会社 ティーテック
International Classes:
F04D15/00; F04D13/00; (IPC1-7): F04D13/00
Domestic Patent References:
| JP1315691A | ||||
| JP6483896A | ||||
| JP6390698A | ||||
| JP63189694A | ||||
| JP63150097U | ||||
| JP6214192U | ||||
| JP448283B1 | ||||
| JP1104730U |
Attorney, Agent or Firm:
Tatsuyuki Unuma
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