Title:
ABNORMALITY DETECTING DEVICE, AIR PURIFYING DEVICE, MINUS ION GENERATING DEVICE, AND HUMIDIFIER
Document Type and Number:
Japanese Patent JPH1124759
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To prevent facilitates to be loaded and it rotation source from being broken when the rotating speed of the rotation source used for pumping-up goes below its lower-limit rotating speed. SOLUTION: This is an abnormality detecting device for a device which pumps up liquid such a water and is equipped with a speed sensor 29 which detects the rotating speed of a motor 5 used for pumping-up, a lower-limit compactor 49 which compares the speed detection signal S6 of the speed sensor 29 with reference signals V1 and V3 regarding a previously set lower-limit threshold speed, an upper-limit compactor 59 which compares the speed detection signal S6 with reference signals V2 and V4 regarding a previously set upper- limit threshold speed, and a microcomputer 89 which decides from the outputs of those compactors 49 and 59. Then when the rotation speed of the motor 5 is lower than the lower-limit threshold speed or higher than the upper-limit threshold speed, the microcomputer 89 stops the operation of the motor 5.
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Inventors:
ITO KEIICHI
OMODAKA KATSUHIKO
OMODAKA KATSUHIKO
Application Number:
JP19067797A
Publication Date:
January 29, 1999
Filing Date:
June 30, 1997
Export Citation:
Assignee:
AIWA CO
International Classes:
F24F6/00; B01D47/06; F24F6/16; F24F7/00; G05B23/02; G05D9/00; (IPC1-7): G05D9/00; B01D47/06; F24F6/00; F24F6/16; F24F7/00; G05B23/02
Attorney, Agent or Firm:
Kunio Yamaguchi (1 person outside)