Title:
WATER SUPPLY DEVICE
Document Type and Number:
Japanese Patent JP2006299939
Kind Code:
A
Abstract:
To provide a water supply device having reliable high empty operation prevention function without spending surplus cost.
The water supply device includes a pump 10, an inverter 14 variably controlling a drive motor of the pump 10. Also, the device is provided with a first empty operation detecting means 34, 36, 38, 40 detecting an empty operation condition from rotation speed and drive current value of the pump, and a second empty operation detection means 34, 42, 44, 46 detecting an empty operation condition of the pump from rotation speed of the pump and pressure in a delivery side and water quantity.
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Inventors:
KAWAI MASATO
NAKAJIMA KAORU
OKUDA KAZUTAKA
NAKAJIMA KAORU
OKUDA KAZUTAKA
Application Number:
JP2005123147A
Publication Date:
November 02, 2006
Filing Date:
April 21, 2005
Export Citation:
Assignee:
EBARA CORP
International Classes:
F04B49/06; F04B49/10; F04D15/00
Domestic Patent References:
JPS60185078U | 1985-12-07 | |||
JPS5685083U | 1981-07-08 | |||
JPS56150883U | 1981-11-12 | |||
JP2002195163A | 2002-07-10 | |||
JPS5685082U | 1981-07-08 |
Attorney, Agent or Firm:
Susumu Ohata
Kuribayashi Mitsuo
Kuribayashi Mitsuo