RECIRCULATING AIR CURTAIN Russian patent published in 2011 - IPC F24F9/00 F24F11/53 

FIELD: machine building.

SUBSTANCE: curtain is equipped with ventilation unit located on one side of aperture. The ventilation unit has slit inlet and outlet nozzles connected correspondingly to suction and pumping branches of a fan. The outlet nozzle is positioned in a tambour on a side of the aperture at acute angle to its plane. Dividing screens are installed in the slit of the outlet nozzle; while directing strips are secured to side walls of the tambour. The outlet nozzle is equipped with a gate kinetic coupled with one of the directing strips; also, the fan is equipped with a drive with a rotation velocity regulator in form of a unit of powder electro-magnetic couplings and with a temperature regulator with an open air temperature sensor. The temperature regulator has a comparator and a task unit, The comparator is connected to an input of an electron amplifier equipped with a unit of non linear feed back. Additionally, output of the electron amplifier is connected to input of the magnetic amplifier with a rectifier, output of which is connected to the rotation velocity regulator in form of the unit of powder electromagnetic couplings of the fan drive.

EFFECT: reduced power output for fan drive.

2 dwg