Ecolaire Incorporated

Turbodyne Corporation (gas Turbine Div.)

Jerry D Burkett

A centrifugal fan provided with dampers is driven by a motor having a speed control circuit. Air flow from the centrifugal fan is controlled from a point of maximum air flow to a predetermined crossover speed only by changing the velocity of the fan impeller with subsequent air flow control at air flow rates below said crossover speed being attained only by adjustment of the fan dampers.

Centrifugal fan air control system

Adjustable speed drive system for centrifugal fan

In an electrical power generating installation which includes a plurality of turbine-generator sets, a parking bus is disclosed, which is provided with a potential regulated at a relatively low and constant frequency of the order of 1-2 Hz. Switching and phase and frequency matching means are provided, which enable the same controlled variable frequency starting system used for start-up of the turbine-generator sets, to be used for gradually adjusting the rotational speed of a selected turbine-generator set to a point where phase and frequency may be matched with that of the parking bus, to then permit the generator member of such set to be electrically transferred to the bus. By means of such arrangement, any number of turbine-generator sets may be connected in parallel to the parking bus which thereupon effects a simultaneous, continued low speed rotation of the sets for cooling or other purposes. The sophisticated, complex, and costly start-up system, is thus freed of any requirement for continuing rotation of the sets during the long cool-down period, whereby in typical installations but a single such start-up system is required.

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Hopewell Junction, NY, United States of America

Jerry D Burkett