Title:
PUMP DEVICE
Document Type and Number:
WIPO Patent Application WO/2014/175248
Kind Code:
A1
Abstract:
The present invention pertains to a pump device suitable for use as a water supply device that supplies water to a building. The pump device is equipped with a pump (2), a motor (3) that drives the pump (2), a drive device (20) that drives the motor (3) at a variable speed, and a control unit (40) that starts the pump (2) when the discharge pressure has decreased to a prescribed starting pressure, and controls the drive device (20) such that the discharge pressure achieves a target pressure on a target pressure control curve. The control unit (40) determines a minimum value (PL) for the discharge pressure after the pump (2) has started, and calculates the difference (ΔP1) between the minimum value (PL) and a prescribed lower limit value (Pz) for the discharge pressure, and corrects the target pressure control curve (R) on the basis of the difference (ΔP1).
Inventors:
KARAKI RYOTARO (JP)
HIGAKI NOBUHIRO (JP)
HARADA YOSUKE (JP)
MIYAUCHI SACHIKO (JP)
KONISHI YASUTAKA (JP)
KANEDA KAZUHIRO (JP)
TEJIMA TOMOHARU (JP)
HIGAKI NOBUHIRO (JP)
HARADA YOSUKE (JP)
MIYAUCHI SACHIKO (JP)
KONISHI YASUTAKA (JP)
KANEDA KAZUHIRO (JP)
TEJIMA TOMOHARU (JP)
Application Number:
PCT/JP2014/061247
Publication Date:
October 30, 2014
Filing Date:
April 22, 2014
Export Citation:
Assignee:
EBARA CORP (JP)
International Classes:
F04D15/00
Domestic Patent References:
| WO2012099242A1 | 2012-07-26 | |||
| WO2012099242A1 | 2012-07-26 |
Foreign References:
| JP2000018167A | 2000-01-18 | |||
| JPH08277782A | 1996-10-22 | |||
| JPS61261696A | 1986-11-19 |
Other References:
See also references of EP 2990652A4
Attorney, Agent or Firm:
WATANABE, Isamu et al. (JP)
Isamu Watanabe (JP)
Isamu Watanabe (JP)
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