Multi-blade centrifugal fan
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United States of America Patent
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Apr 16, 2013
Grant Date -
May 21, 2009
app pub date -
Nov 24, 2006
filing date -
Nov 25, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
A multi-blade centrifugal fan for preventing circular flows in the end portions of an impeller in the axial direction is provided in a simple structure. The multi-blade centrifugal fan is formed of a fan casing of a scroll type and a multi-blade centrifugal impeller. The fan casing has a bellmouth which becomes an air intake. The multi-blade centrifugal impeller has a number of annularly arranged blades inside the fan casing. The centrifugal impeller draws in air through the intake, which faces the bellmouth, and blows out the air in the centrifugal direction through the blades. A retainer ring is provided in an outer peripheral end portion of the impeller. A cylindrical body is integrally provided in such a manner as to extend from the outer end of the retainer ring, so that circular flows toward the intake side are prevented in the end portions of the impeller.
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