Induction unit for uniting air flows

Abstract

The invention relates to an induction unit for uniting air flows, comprising at least one induction duct ( 21 ) coordinated with a primary air duct ( 30 ) and having an upstream end and a downstream end and a straight reference line (A) passing through the ends, and at least one first opening ( 28 ) for a primary air flow (F 1 ), connected to the primary air duct ( 30 ) and opening with concurrent flow into the induction duct ( 21 ). The induction duct ( 21 ) has a secondary air intake ( 22 ) for the intake of a secondary air flow (F 2 ) from a space surrounding the induction unit and an outlet ( 24 ) designed to return an air flow (F 3 ) resulting from the primary air flow and the secondary air flow to the space surrounding the induction unit. The secondary air intake ( 22 ) is arranged at the upstream end of the induction duct ( 21 ) and is directed substantially parallel to the center line (A) thereof.

1 . An induction unit for uniting air flows, comprising at least one induction duct coordinated with a primary air duct and having an upstream end and a downstream end and a straight reference line passing through the ends, and at least one first opening for a primary air flow, connected to the primary air duct and opening with concurrent flow into the induction duct, at least one secondary air intake for the intake of a secondary air flow to the induction duct from a space surrounding the induction unit, and at least one outlet designed to return an air flow resulting from the primary air flow and the secondary air flow to the space surrounding the induction unit, characterized in that the secondary air intake is arranged at the upstream end of the induction duct, so that both the primary air flow itself and the secondary air flow generated thereby, and the resulting air flow are directed substantially parallel to the reference line of the induction duct. 
     
     
         2 . The induction unit as claimed in  claim 1 , characterized in that each first opening is arranged in such a way that both the primary air flow itself and the secondary air flow generated thereby, and the resulting air flow are directed substantially parallel to the center line of the induction duct. 
     
     
         3 . The induction unit as claimed in  claim 1 , characterized in that a longitudinal partition wall is arranged in the induction duct in such a way that a first induction duct is formed on one side of the partition wall and a second induction duct is formed on the other side of the partition wall. 
     
     
         4 . The induction unit as claimed in  claim 3 , characterized in that each induction duct has its own primary air duct with associated first openings for the primary air. 
     
     
         5 . The induction unit as claimed in  claim 4 , characterized in that the first primary air duct and the second primary air duct have openings of different sizes. 
     
     
         6 . The induction unit as claimed in  claim 4 , characterized in that the partition wall is moveable. 
     
     
         7 . The induction unit as claimed in one of the preceding claims  claim 1 , characterized in that at least one induction duct can be shut off whilst at least one induction duct continues in operation and/or that at least one induction duct can be set in operation whilst at least one induction duct is in operation and/or that the resulting flow in each induction duct is individually variable, depending on the primary air flow through the associated primary air duct. 
     
     
         8 . The induction unit as claimed in one of the preceding claims  claim 1 , characterized in that the secondary air intake has an area which is at least twice as large as the area of the outlet. 
     
     
         9 . The induction unit as claimed in one of the preceding claims  claim 1 , characterized in that a heat exchanger is connected in series to the secondary air intake. 
     
     
         10 . The induction unit as claimed in  claim 1 , characterized in that the outlet is arranged at the downstream end of the induction duct and is oriented substantially axially with its center line.