Pumps – Condition responsive control of pump drive motor – Plural pumps having separate drive motors – supply sources,...
Reexamination Certificate
2005-09-06
2005-09-06
Freay, Charles G. (Department: 3746)
Pumps
Condition responsive control of pump drive motor
Plural pumps having separate drive motors, supply sources,...
C417S014000, C417S018000, C417S043000, C062S175000, C062S228300
Reexamination Certificate
active
06939109
ABSTRACT:
The present invention provides a system which comprises primary supply pumps and secondary supply pumps and controls pressurized water supply systems, air-conditioning systems, or the like that supply chilled water or hot water using these pumps. In the present invention, calculation is carried out based on measurement signals obtained by measuring pressure, flow rate, open rate of valves, etc. by providing sensors in supply channels.
REFERENCES:
patent: RE27148 (1971-06-01), Schaub
patent: 6370896 (2002-04-01), Sakakibara et al.
patent: 6428282 (2002-08-01), Langley
patent: 6579067 (2003-06-01), Holden
Kosaka Hiromichi
Takahashi Hiroshi
Tani Keisuke
Yoshida Shigehiro
Asahi Kogyosha Co., Ltd.
Westerman Hattori Daniels & Adrian LLP
Yokogawa Electric Corporation
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