Air flow controlling apparatus

Details Air flow controlling apparatus Air flow controlling apparatus

F - Mech Eng,Light,Heat,Weapons

24

F

122/27, 342/38

F24F 11/04 (2006.01) F23L 3/00 (2006.01) F23L 5/02 (2006.01)

Patent

CA 1209680

ABSTRACT OF THE DISCLOSURE 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.

457411

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