Dual speed rotary vane pump

Details Dual speed rotary vane pump Dual speed rotary vane pump

1978-03-29

1980-06-10

Gluck, Richard E.

Pumps

Condition responsive control of pump drive motor

Having timer or delay means

417 87, 318305, 318306, F04D 4900

Patent

active

042070317

ABSTRACT:
A dual speed mechanical rotary vacuum pump wherein a mechanical rotary vacuum pump is directly connected to a two speed electrical motor which drives the pump and the speed of the motor is controlled by an electrical control circuit which selectively causes the motor to rotate at either a first speed for a predetermined period of time or at a second slower speed. The speed of the motor is automatically switched to the slower speed after the predetermined period of time.

REFERENCES:
patent: 2690291 (1954-09-01), Taylor
patent: 3023690 (1962-03-01), Long
patent: 3150817 (1969-09-01), Jepsen et al.
patent: 3935522 (1976-01-01), Tsay
patent: 4085594 (1978-04-01), Mayer

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