Air flow controlling apparatus

Details Air flow controlling apparatus Air flow controlling apparatus

1984-06-26

1987-01-20

Yuen, Henry C.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307 66, 1262875, F24F 700, H02J 906

Patent

active

046372962

ABSTRACT:
An air flow controlling apparatus for accomplishing blasting with a desired air flow by controlling an electric motor for a ventilator for feeding air for combustion to a boiler as well as a damper located in an air course. In order to control a temporary increase or decrease of an air flow due to a variation of a rotational frequency of the electric motor when power supply to the electric motor is changed over between a commercial power source and a variable frequency power source, the apparatus includes a preceding controlling signal generating means which regulates the opening of the damper for a period of time from a point of time at which a power source changing over instruction is received to another point of time at which an actual changing over operation is performed.

REFERENCES:
patent: 3784892 (1974-01-01), Zelina
patent: 3791351 (1974-02-01), Kent
patent: 4129811 (1978-12-01), Pearson
patent: 4237385 (1980-12-01), Jurgens et al.
patent: 4255697 (1981-03-01), Buhler, III
patent: 4432272 (1984-02-01), Becelaere
patent: 4490624 (1984-12-01), Luker

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