Procedure for supplying air in a spray booth (embodiments) and a ventilation unit to implement the procedure (embodiments)

摘要

An air supply unit for feeding and extracting air from a paint booth at least during a painting mode, wherein the air supply unit comprises: a return air treatment unit (8) configured to provide a return air stream at the same time that paint is supplied to an object located in the paint booth to paint the object, the return air treatment unit having a partition (21) that divides the internal volume of the treatment unit of return air (8) thus forming a suction zone (22), a pressure zone (11) and a recirculation zone (23), said partition being configured as connected upper and lower parts, the lower part being hermetic said parts of said partition (21) and having the upper part of said parts of said partition (21) holes for return air; an intake unit (9) connected to the recirculation zone (23) of the return air treatment unit (8) by means of a mixing zone (3) of the air supply unit, said unit being configured inlet (9) to provide fresh air to said mixing zone (3) while painting is supplied to an object located in the paint booth to paint the object, said mixing zone (3) being configured to mix said return air and fresh air leaving the intake unit (9); an air duct (7) operatively connected to the suction zone (22) for transporting used air from said paint booth to the suction zone (22); an air regulation unit (12) for extracting air from said pressure zone (11) of said return air treatment unit (8), an air regulation unit (18) for taking fresh air to supply it to said admission unit (9); a recirculation fan (10) located between said suction zone (22) and said pressure zone (11) configured to create negative pressure in said suction zone (22) and pressure in said pressure zone (11) so that an air flow in the pressure zone (11) is directed towards the recirculation zone (23); and an intake fan (13) positioned to aspirate air through said air intake unit (9), wherein said mixing zone (3) is located either in the paint booth between the air handling unit. return air (8) and the intake unit (9), or above the return air treatment unit (8) and the intake unit (9).