PROCEDURE FOR LOCAL EXAUST VENTILATION AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2011 - IPC F24F7/06 B08B15/02 

FIELD: machine building.

SUBSTANCE: peripheral jet of incoming air is generated in form of swirled circular jet; also symmetry axis of peripheral jet is matched with symmetry axis of suction branch. Flow of air in the peripheral jet is oriented so, that projection of this flow rate to symmetry axis is directed opposite to direction of a sucked flow. Characteristic diametre of the generated periphery jet exceeds diametre of the sucked jet at inlet into the suction branch not less, than five times. One end of the device case is open, while another one - closed. The device is equipped with a plate positioned inside the case parallel to the closed end. In the plate and in the open end there are coaxial orifices facilitating passage of the suction branch through them without a gap. The plate is set with a gap to side walls of the case. Between the plate and the closed end there is formed an inlet channels for supply of purified air and for generation of the periphery jet. The device is equipped with an appliance for swirling the periphery jet installed inside the inlet channel.

EFFECT: improved work environment and safety measures.

10 cl, 3 dwg