BLADE WHEEL OR UPSTREAM STEERING CROWN WITH AXIAL OR SEMI-AXIAL FLOW AND WITH A DIAMETER HUB GROWING ACCORDING TO THE FLOW DIRECTION, PARTICULARLY FOR THE COOLING OF INTERNAL COMBUSTION ENGINES OF VEHICLES

摘要

On the fans used to cool the internal combustion engines of vehicles, impellers or guide rings are used, with axial or semi-axial flow, of which the hub 17 and the blades 4 are made of a single injection molded part. or casting and the diameter of the hub 17 increases in the direction of flow. To allow such parts to be manufactured in a simple manner and with a small axial size, the increase in diameter concerns only the area 8 of the hub 17 which is between the blades 4 and the area of the blades which is turned towards the arrival of 'air, while in the area 9 of the downstream face 7 of the blades 4, the contour of the hub 17 has a cylindrical shape, or a slightly conical shape with a diameter which decreases according to the direction of flow.