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(11) | EP 2 400 162 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | Improved centrifugal fan, in particular for extractor hoods |
(57) A centrifugal fan with a helical external profile, formed by a pair of half-shells
which may be coupled to one another, an impeller mounted in the body which can be
driven in rotation about a first axis (X), the body being provided with a pair of
opposing lateral extraction openings coaxial with the first axis and a tangential
delivery opening coaxial with a second axis positioned tangentially with respect to
the impeller, a pressure chamber being formed in the body whose volume is formed between
the impeller and the helical profile of the body, this helical profile developing
from a point at a minimum radial distance from the first axis in a median plane (P)
of symmetry of the body (2).
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