Patent ID: 8784075

Claim:
A ventilation device comprising: a fan capable of being driven rotationally by an open electric motor which is firmly attached to a support intended for fixing said ventilation device, the fan consisting of a plurality of blades which are distributed regularly around a bowl inside which there are arranged internal ribs capable of ventilating said open electric motor, wherein the support comprises a central part which is connected in a substantially sealed manner to at least one peripheral portion of the open electric motor, the central part of the support comprising a hole configured to receive, at least partially, said motor, wherein said central part of the support consists of a component having an annular shape and is configured to hold said motor, wherein the hole comprises a through hole, the cross-section of which is substantially complementary to and slightly smaller than that of the open electric motor, said through hole configured to receive said open electric motor, wherein the through hole is delimited by an inner edge, wherein the inner edge of the through hole is in continuous contiguous contact with an entire circumference of a lateral wall of the open electric motor, wherein the central part of the support is capable of holding the electric motor by tight fitting, wherein the tight fitting results from the open electric motor being forcibly pushed into the through hole in a position to be immobilized by a gripping exerted by the central part of the support, wherein the central part comprises an active surface, which is positioned opposite a bottom of the bowl and which has a concave shape capable of facilitating a flow of the air from an inside to an outside of said bowl, and wherein the active surface of the central part has a cross-section in the shape of a quarter of a circle whose two ends extend respectively substantially axially at the inner edge of the central part, and substantially transversally at an outer edge of said central part.