Blower having a sound-damping structure
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United States of America Patent
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May 5, 1992
Grant Date -
N/A
app pub date -
Aug 2, 1990
filing date -
Aug 9, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A blower comprises an impeller which can function to raise the pressure of a fluid and delivers it; a driving device for driving the impeller; and a fan casing which includes a fluid path to inspire the fluid from the outside and deliver it to the outside through the impeller; wherein the fan casing is at least partly formed by a hard porous structural unit whose specific gravity is continuously changed in at least one of the direction of thickness and a direction of surface.
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