Title:
SUBMERGED PUMP
Document Type and Number:
Japanese Patent JP3314224
Kind Code:
B2
Abstract:
PURPOSE: To enable positive water level detection with relatively simple constitution and perform action control correctly according to the change of water level.
CONSTITUTION: The grounding conductor GL of a sensor control circuit SC is connected to the power lines 51, 52 side. Since the grounding 41 of a power source 40 has electrically equal potential to the bottom ground surface GND of reservoir water W, a capacitor C2 for detecting the water level is provided only with an isolated electrode 22, and there is no need to provide an earth electrode. Since there is no earth electrode, there is no need to provide insulating coating for covering it, so that water level sensitivity in the capacitor is prevented from being lowered by the influence of insulating coating for covering the earth electrode.
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Inventors:
Masao Ueda
Shuhei Sasaki
Shuhei Sasaki
Application Number:
JP2976995A
Publication Date:
August 12, 2002
Filing Date:
February 17, 1995
Export Citation:
Assignee:
ShinMaywa Industries,Ltd.
International Classes:
F04D13/08; G01F23/26; G05D9/12; F04D15/00; (IPC1-7): F04D13/08; F04D15/00; G01F23/26
Domestic Patent References:
| JP3249395A | ||||
| JP5441768A | ||||
| JP61233323A | ||||
| JP54104872A | ||||
| JP4711638U | ||||
| JP6336246U |
Attorney, Agent or Firm:
Shigeaki Yoshida (2 outside)