Title:
WATER SUPPLY DEVICE
Document Type and Number:
Japanese Patent JP3883382
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a water supply device capable of continuing operation while preventing no-discharge operation of a pump.
SOLUTION: This water supply device provided with the pump 3 and an inverter 2 for supplying electric power to the pump 3 and controlling rotation speed of the pump 3 is provided with a reference current value table 20 relating rotation frequency of the pump 3 to a reference current value which becomes a criterion for judging no-discharge operation in the rotation frequency, a frequency detector 21 detecting rotation frequency of the pump 3, a reference current value acquisition device 22 acquiring a reference current value corresponding to the rotation frequency detected by referring to the reference current value table 20, a current detector 23 detecting a current value of the pump 3, and a comparator 24 comparing the detected current value with the reference current value.
Inventors:
Kaoru Nakajima
Yukio Murai
Kawai Masato
Yukio Murai
Kawai Masato
Application Number:
JP2000391557A
Publication Date:
February 21, 2007
Filing Date:
December 22, 2000
Export Citation:
Assignee:
Ebara Corporation
International Classes:
E03B5/04; F04B49/00; F04B49/06; F04B49/10; F04D15/00; H02P27/06; (IPC1-7): F04B49/06; E03B5/04; F04B49/00; F04B49/10; F04D15/00; H02P7/63
Attorney, Agent or Firm:
Isamu Watanabe
Shintaro Hotta
Shintaro Hotta