Pumps – Condition responsive control of pump drive motor – With condition responsive control of pump fluid valve
Patent
1985-07-23
1987-05-12
Croyle, Carlton R.
Pumps
Condition responsive control of pump drive motor
With condition responsive control of pump fluid valve
417 28, 417 45, 417295, F04B 4902
Patent
active
046646019
ABSTRACT:
An operation control system of a rotary displacement type vacuum pump capable of reducing a starting torque of the vacuum pump includes a suction regulating valve and a pressure sensor for monitoring suction pressure located in a suction passage of the vacuum pump, an inverter electrically coupled to a variable speed electric motor for driving the vacuum pump and a control unit. The control unit is operative, when the vacuum pump is started, to keep the suction regulating valve in a closed position until the value of suction pressure monitored by the pressure sensor reaches a predetermined upper limit value and to gradually increase the rpm. of the variable speed electric motor. The control unit is further operative to produce a signal for increasing or decreasing the rpm of the variable speed electric motor so as to bring the value of suction pressure monitored by the pressure sensor to the vicinity of a predetermined lower limit value.
REFERENCES:
patent: 3890063 (1975-03-01), Spafford
patent: 4068980 (1978-01-01), Fine
patent: 4135860 (1979-01-01), Van Nederkassel
patent: 4219312 (1980-08-01), Mori et al.
patent: 4225288 (1980-09-01), Mugele et al.
patent: 4492526 (1985-01-01), Hartwig
patent: 4511312 (1985-04-01), Hartwig
patent: 4518316 (1985-05-01), Yokota
Matsubara Katsumi
Tsuru Seiji
Uchida Riichi
Croyle Carlton R.
Hitachi , Ltd.
Neils Paul F.
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