Refrigeration – Air compressor – cooler and expander type – Motor-type expander
Patent
1975-04-02
1976-08-31
King, Lloyd L.
Refrigeration
Air compressor, cooler and expander type
Motor-type expander
F25D 900
Patent
active
039778525
ABSTRACT:
A compressor-expander having a vaned rotor eccentrically mounted in a cylindrical chamber to define a series of compartments which vary in volume through volumetric stages which are maximum, convergent, minimum and divergent. The compressor-expander has an associated heat exchanger connected to heat exchanger ports at the convergent and divergent stages and spaced inlet and outlet ports at the maximum stage. Means are provided for inducing, or blowing, warm air through the successively presented compartments at the maximum stage to achieve a scavenged discharge of cool air to recharge each compartment with warm air. Preferably the flow is induced by a high pressure jet which entrains air in the air stream to produce an amplified flow, the compressed air being bled from the cold end of the heat exchanger. A valve is interposed in the bleed line to coordinate the rate of bleed either manually or automatically with the rotor speed or the operating conditions, primarily pressure, existing in the heat exchanger. Where the rotor speed is subject to variation over wide limits, as in automotive usage, a relief type valve may be used. Alternatively, a blower is used to induce air flow, the blower being driven from the rotor shaft. As a still further alternative the blower may be separately driven and the air stream controllingly throttled to vary the rate of discharge of air into the cooled space. In any event, the rate of flow of warm air in the scavenging stream may exceed the rate of production of cold air in the rotor compartments so that air is discharged into the cooled space at a tempered, more comfortable level. A thermostat in the space, or in the air stream which cools the space, acts correctively to control the flow of air in the stream or to control the speed at which time rotor is driven thereby to control BTU rate.
REFERENCES:
patent: 2733663 (1956-02-01), Marshall
patent: 3686893 (1972-08-01), Edwards
patent: 3752605 (1973-08-01), Newton
King Lloyd L.
The Rovac Corporation
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