Rotary kinetic fluid motors or pumps – Working fluid passage or distributing means associated with... – Casing having tangential inlet or outlet
Patent
1976-03-24
1977-12-20
Powell, Jr., Everette A.
Rotary kinetic fluid motors or pumps
Working fluid passage or distributing means associated with...
Casing having tangential inlet or outlet
415211, F04D 1710, F04D 2944
Patent
active
040638480
ABSTRACT:
The invention is concerned with an improvement in a centrifugal compressor. Such a compressor includes an inducer section including an impeller having a plurality of impeller blades rotatingly driven by a shaft of the compressor to impel air centrifugally outwardly from the shaft with an air intake duct defined by a casing radially about the impeller blades and a diffuser having a plurality of diffuser vanes in said duct downstream a spaced vane-free distance from a downstream end of the inducer. The improvement of the invention comprises a slot extending into the casing upstream of the diffuser vanes to bring about a reduction in surge flow and hence a reduction in a flow value at which stalling of the compressor occurs. Generally, the slot comprises a circumferential groove in the casing. In a preferred embodiment of the invention the slot is located intermediate the inducer and the diffuser vanes.
REFERENCES:
patent: 1663998 (1928-03-01), Schmidt
patent: 2814434 (1957-11-01), Boyd
patent: 2925952 (1960-02-01), Garve
patent: 3893787 (1975-07-01), Jones
Waltz Gerry L.
Wiggins Jesse O.
Caterpillar Tractor Co.
Powell Jr. Everette A.
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