Fan housing with integrated protection elements having an air gap between the stator and rotor

摘要

The housing (2) is provided with a cup shaped recess (4) and has an external rotor drive motor. This comprises an inner stator (26,28) and an outer rotor (34) separated from the stator by an air gap (52). The stator is arranged on a bearing tube (24) which is connected to a base part (46). The tube and base arrangement together with the recess form a fluid tight annular space (54) around the stator. A wall of this ring extends through the air gap between the stator and the rotor.