IMPELLER WHEEL FOR DIAGONAL OR RADIAL FANS, INJECTION MOULDING TOOL FOR MANUFACTURING SUCH A IMPELLER WHEEL,AND DEVICE COMPRISING AT LEAST ONE SUCH IMPELLER WHEEL

摘要

The impeller wheel comprises a bottom disc (7) and a cover disc (1) that are interconnected by blades (6). The cover disc (1), the bottom disc (7) and the blades (6) are three-dimensionally shaped in such a manner that they can be manufactured in an injection moulding process so as to be formed in one piece. When projected onto a cylinder, which is coaxial to the rotation axis (13), with a median diameter of the trailing edge(15) or of the leading edge (17), the extensions of the trailing edge (15) and/or of the leading edge(17) of the blades encompass an angle with a line that is parallel to the rotation axis (13), of which at least one angle is other than 0°. For manufacturing the bottom disc with an interface, the injection moulding tool comprises at least one mould insert that is situated between two sliders. (Figs 2,3)