Title:
AIR LOCK OPERATION TIME SHORTENING DEVICE FOR DRAINAGE PUMP
Document Type and Number:
Japanese Patent JP3122769
Kind Code:
B2
Abstract:
PURPOSE: To shorten air lock operation time, avoid the generation of abnormal vibration, reduce fuel consumption or power consumption at the time of pumping cut-off operation and avoid adverse effect on a pump constituent member such as a submerged bearing generated by the temperature rise of remaining water by making water, remaining in a lifting pipe, escape rapidly at the time of switching to pumping cutoff operation.
CONSTITUTION: The lower part of a lifting pipe 4 is piercingly provided with an escape port 12, and a siphon-like escape pipe 13 with an air lock preventing valve 15 interposed is connected to the escape port 12. When the water level of a water absorbing well 9 is lowered to the pumping cut-off water level SWL from a normal operating state, an intake valve 6A is fully opened to switch to pumping cut-off operation. At the same time, the air lock preventing valve 15 is opened by a valve opening signal outputted from a controller 8. Water W remaining in the lifting pipe 4 thereby escapes rapidly into the water absorbing well 9 by the siphon action of the escape pipe 13.
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Inventors:
Ikuji Tamura
Application Number:
JP15919695A
Publication Date:
January 09, 2001
Filing Date:
June 26, 1995
Export Citation:
Assignee:
Kubota Corporation
International Classes:
F04D13/00; (IPC1-7): F04D13/00
Domestic Patent References:
| JP6272689A | ||||
| JP45496A |
Attorney, Agent or Firm:
Koichi Suzue (1 person outside)