Regulating device with starting and stopping device for screw-ty

Details Regulating device with starting and stopping device for screw-ty Regulating device with starting and stopping device for screw-ty

1994-04-14

1996-07-02

Bertsch, Richard A.

Pumps

Condition responsive control of pump drive motor

By control of electric or magnetic drive motor

417282, 137542, F04B 4906

Patent

active

055315712

ABSTRACT:
A regulating device for screw-type compressors, which contain a compressor dement (1), an electrical motor (2) to drive the compressor element (1), a minimum pressure valve (4) which is mounted on the outlet (5) of the compressor element (1) and a vessel (6) which is mounted between the compressor element (1) and the minimum pressure valve (4), includes a controller which causes the motor (2) to turn at a frequency-regulated rotational speed at an almost constant pressure in the vessel (6), and a non-return valve (12) which is mounted on the inlet (10) of the compressor element (1) to aid in starting and stopping the motor.

REFERENCES:
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patent: 3367562 (1968-02-01), Persson et al.
patent: 3727636 (1973-04-01), Simmons
patent: 3778192 (1973-12-01), Caffrey
patent: 3961862 (1976-06-01), Edstrom et al.
patent: 4149827 (1979-04-01), Hofmann, Jr.
patent: 4171188 (1979-10-01), Anderson et al.
patent: 4664601 (1987-05-01), Uchida et al.
patent: 4738118 (1988-04-01), Kanazawa
patent: 4765364 (1988-08-01), Arcari
patent: 4959969 (1990-10-01), Okamoto et al.
patent: 5008297 (1992-02-01), Maruyama et al.

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