Pumps – Condition responsive control of pump drive motor – Responsive to accumulation of pumped liquid in receiver
Patent
1990-08-08
1992-11-03
Bertsch, Richard A.
Pumps
Condition responsive control of pump drive motor
Responsive to accumulation of pumped liquid in receiver
417 22, 417 27, 417 28, 417 40, 417 45, 290 52, F04D 1500
Patent
active
051602440
ABSTRACT:
A variable-speed pump system comprising: a hydraulic machine having a flow adjusting means and including at least a pumping function; a rotary machine operatively connected to the hydraulic machine and including at least a motor function for rotating the hydraulic machine; a frequency converter for driving the rotary machine; and a control system for controlling variable-speed operation of the rotary machine according to a command signal from an external unit. The pump system also includes an electric power control system, a flow adjustment control system, and a rotational speed control system. The power control system has a negligibly small time constant, compared to the time constant of the rotational speed control system. The flow adjustment control system and/or the rotational speed control system has a means for setting a transmission function in such a manner that a mechanical load of the hydraulic machine is not reduced while the rotational speed thereof is increasing, and that the mechanical load is not increased while the rotational speed is lowering.
REFERENCES:
patent: 4287429 (1981-09-01), Bashnin et al.
patent: 4708594 (1987-11-01), Shinmei et al.
patent: 4816696 (1989-03-01), Sakayori et al.
Kita Eizo
Kuwabara Takao
Bertsch Richard A.
Hitachi , Ltd.
Kansai Electric Power Co., Ltd.
Scheuermann David W.
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