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1. (WO1998050700) WATER FEEDER

Pub. No.:    WO/1998/050700    International Application No.:    PCT/JP1998/001956
Publication Date: Fri Nov 13 00:59:59 CET 1998 International Filing Date: Wed Apr 29 01:59:59 CEST 1998
IPC: F04D 15/00
F04D 15/02
Applicants: EBARA CORPORATION

KOBAYASHI, Makoto

YAMAMOTO, Masakazu

MIYAKE, Yoshio

YAGI, Kaoru

UWAI, Keita

MIYAZAKI, Yoshiaki

IIJIMA, Katsuji

Inventors: KOBAYASHI, Makoto

YAMAMOTO, Masakazu

MIYAKE, Yoshio

YAGI, Kaoru

UWAI, Keita

MIYAZAKI, Yoshiaki

IIJIMA, Katsuji

Title: WATER FEEDER
Abstract:
A water feeder for pressure feeding water to a desired location by the use of a volute pump, which comprises a volute pump (2) driven by a motor, a frequency converter (13) for supplying the motor with electricity, and a pressure tank (7). When frequencies generated by the frequency converter (13) are sensed to indicate that the pump is operated with a flow rate below a predetermined value, an output of the frequency converter is stopped to stop the pump. The frequency converter (13) is preset to generate higher frequencies in a region of small flow rates than in a region of large flow rates.