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Title:
給水装置
Document Type and Number:
Japanese Patent JP4668403
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a water feeding device capable of detecting, using a relatively simple method without use of an expensive flow switch, a shutoff operating condition wherein the amount of water is zero, and then being operated for stopping a small amount of water. SOLUTION: The water feeding device includes a pump P, a pressure sensor 14 for detecting pressure on the delivery side by way of the check valve 11 of the pump P, and a means for controlling the rotating speed of the pump P correspondingly to the pressure. The device has data about the relationship between the rotating speed of the pump P and shutoff pressure corresponding to the rotating speed or between pressure on the delivery side of the pump P and the speed of shutoff operation corresponding to the pressure. Based on the relationship between the pressure detected by the pressure sensor 14 and the rotating speed of the pump P, a determination is made that the pump P is in shutoff operation, and then the pump is operated for stopping a small amount of water.

Inventors:
Kaoru Nakajima
Hiroshi Hamada
Yuji Teshima
Application Number:
JP2000319153A
Publication Date:
April 13, 2011
Filing Date:
October 19, 2000
Export Citation:
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Assignee:
Ebara Corporation
International Classes:
F04B49/00; F04D15/00; F04B49/06
Domestic Patent References:
JP59200094A
JP7167102A
Attorney, Agent or Firm:
Isamu Watanabe
Shintaro Hotta