Blower for Motor Vehicle

Abstract

posed is a blower ( 10 ) for a motor vehicle, in particular a blower ( 10 ) for a heating and air conditioning unit and/or an engine of a motor vehicle, comprising:—a compressed air generator ( 14 ) for generating compressed air and—a sheath flow nozzle ( 12 ) for discharging the compressed air in the form of a sheath flow ( 34, 34 a, 34 b, 34 c ) by means of which feed air ( 32 ), in particular feed air conducted to the sheath flow nozzle ( 12 ) via a feed air supply ( 20 ), is entrained in the form of a central flow ( 36, 36 a, 36 b, 36 c ).

1 . A blower for a motor vehicle, for a heating and air conditioning unit and/or an engine of a motor vehicle, comprising;
 a compressed air generator for generating compressed air; and   a sheath flow nozzle for discharging the compressed air in the form of a sheath flow in which feed air conducted to the sheath flow nozzle via a feed air supply, is entrained in the form of a central flow.   
     
     
         2 . The blower according to  claim 1 , wherein the compressed air of the sheath flow nozzle is conducted by the compressed air generator through a duct with a sound attenuator comprising a circular silencer. 
     
     
         3 . The blower according to  claim 1 , wherein the feed air supply comprises a first duct comprising a first pipe or a first hose, and the compressed air is conducted to the sheath flow nozzle through a second duct, comprising a second pipe or a second hose, the second duct being, at least partially, arranged inside the first duct 
     
     
         4 . The blower according to  claim 1 , wherein the sheath flow nozzle has a discharge opening with an oval comprising a circular, or a rectangular contour. 
     
     
         5 . The blower according to  claim 1 , wherein the sheath flow nozzle has a discharge opening, which is designed as a gap between two essentially parallel surfaces, wherein the discharge opening is broken up by spacers arranged between the parallel surfaces. 
     
     
         6 . The blower according to  claim 4 , wherein in the direction of discharge, behind the discharge opening, a wall oriented parallel to the direction of discharge is arranged on the surface of which the sheath flow moves along. 
     
     
         7 . The blower according to  claim 1 , wherein the sheath flow nozzle comprises the sheath flow nozzle is arranged such that the sheath flow is directed at particularly heated points in an engine compartment comprising an exhaust manifold or a turbocharger. 
     
     
         8 . The blower according to  claim 1 , wherein the sheath flow nozzle comprises at least one first sheath flow nozzle for discharging the compressed air as a first sheath flow, which entrains a first central flow, and at least a second sheath flow nozzle for discharging the compressed air as a second sheath flow, wherein the second sheath flow entrains the first central flow entrained by the first sheath flow. 
     
     
         9 . The blower according to  claim 1 , wherein the sheath flow nozzle has several nozzle areas for the generation of several individual sheath flows, wherein the pressures of the individual sheath flows can be controlled individually. 
     
     
         10 . The blower according to  claim 1 , wherein the sheath flow nozzle has a discharge opening having a maximum diameter of between 10 and 100 cm and/or the discharge opening has a length of between 50 and 200 cm and a width of between 1 mm and 20 mm. 
     
     
         11 . A method for ventilating a motor vehicle, in particular for ventilating a heating and air conditioning unit and/or an engine of a motor vehicle, comprising the following steps:
 generating compressed air,   conducting the compressed air to a sheath flow nozzle,   discharging the compressed air from the sheath flow nozzle in the form of a sheath flow, and   entraining feed air as a central flow within the sheath flow.   
     
     
         12 . The method according to  claim 11 , a volume of flow of the central flow is at least 5 times as large as a volume flow of the sheath flow. 
     
     
         13 . The method according to  claim 11 , wherein as a consequence of a Coanda effect, the sheath flow can be attracted by a wall of the sheath flow nozzle and flow along the wall. 
     
     
         14 . A system comprising a blower according to  claim 1  and a heat exchanger of a motor vehicle, wherein the blower is arranged in the direction of travel of the motor vehicle directly in front of and/or directly behind the heat exchanger. 
     
     
         15 . A system comprising a blower according to  claim 8  and a heat exchanger of a motor vehicle, wherein the first sheath flow nozzle of the blower is arranged on one side of the heat exchanger and the second sheath flow nozzle of the blower is arranged on the other side of the heat exchanger.