Method and apparatus for starting series-coupled vacuum pumps

Details Method and apparatus for starting series-coupled vacuum pumps Method and apparatus for starting series-coupled vacuum pumps

1988-09-26

1989-12-19

Croyle, Carlton R.

Pumps

Condition responsive control of pump drive motor

Plural pumps having separate drive motors, supply sources,...

417 53, 417205, 318 50, 318102, F04B 3714, F04B 2308

Patent

active

048879410

ABSTRACT:
A method of starting series-coupled vacuum pumps comprising a primary pump (A) and at least one secondary pump (B) connected between the primary pump and an enclosure (E) in which a vacuum is to be established, the method consisting in starting the primary pump initially and subsequently starting the secondary pump when the suction pressure of the primary pump as reduced by rotation of the primary pump reaches an acceptable value, the method being characterized in that the pressure existing in the secondary pump is determined by using a physical magnitude related to the primary pump and following a law similar to the pressure law.

REFERENCES:
patent: 2246932 (1939-09-01), Collins
patent: 2295775 (1942-09-01), Crittenden
patent: 2926835 (1960-03-01), Lorenz
patent: 4140439 (1979-02-01), Imasu
patent: 4699570 (1987-10-01), Bohn
patent: 4767280 (1988-08-01), Markuson et al.
patent: 4797068 (1989-01-01), Hawakawa et al.

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