Pumps – Plural pumps with individual or relative control – Distributor adjustment
Patent
1978-08-02
1979-12-18
Freeh, William L.
Pumps
Plural pumps with individual or relative control
Distributor adjustment
417428, 418 97, 62510, 417410, F04B 2304, F04B 3902, F04B 1700
Patent
active
041792483
ABSTRACT:
A pair of helical screw rotary hermetic compressor units are connected in parallel across common suction and discharge manifolds. The discharge manifolds open to each unit casing well above the level of accumulated oil within the bottom of the hermetic casings acting as oil sumps. Oil bleed lines are provided for the casings which open to the casing interior at oil bleed ports at the normal level of accumulated oil. The bleed lines are of small diameter and open directly to the discharge manifold at points downstream of the connection between the discharge manifold and the hermetic casing. Excessive accumulation of oil within one of the hermetic compressor casings causes the oil to bleed through its bleed line under a small pressure differential to the discharge manifold for redistribution to the remaining compressors.
REFERENCES:
patent: 1916130 (1933-06-01), Torrey
patent: 3237852 (1966-03-01), Shaw
patent: 3386262 (1968-06-01), Hackbart et al.
patent: 3785169 (1974-01-01), Gylland
patent: 3922114 (1975-11-01), Hamilton
Dunham-Bush, Inc.
Freeh William L.
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