| 摘要 |
A heating unit for a vehicle features a radial fan ( 100 ) having a housing ( 110 ), which housing has an air inlet ( 116 ) and an air exit opening ( 118 ). The heating unit has an air-directing device ( 140 ) that guides an air flow in a pressure chamber ( 115 ) of the housing ( 110 ) to the exit opening ( 118 ). Arranged in the housing ( 110 ) is a radial fan wheel ( 130 ) that serves to generate a flow from the air inlet ( 116 ) via the pressure chamber ( 115 ) to the air exit opening ( 118 ). Also provided is an electrical heating element, e.g. a PTC (Positive Temperature Coefficient) heating element ( 125 ), that serves to transfer heat to the air flow generated by the fan. Air-directing elements ( 632, 634, 636, 638 ) are provided between the exit opening ( 118 ) and the heating element ( 125 ), in order to generate an air flow having a more uniform ( 680 ) velocity distribution.
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