Centrifugal blower and power working machine
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jun 10, 2003
Grant Date -
N/A
app pub date -
Nov 7, 2000
filing date -
Nov 30, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A centrifugal blower capable of reducing noise. The centrifugal blower comprises an impeller having a hub plate and a set of blades disposed on at least one surface of the hub plate so as to surround an axis of rotation; and a casing surrounding the impeller and having a volute portion disposed at an outer peripheral portion thereof. The portion of casing facing the set of blades is formed with a plurality of through holes, whereas a sound absorbing material is attached thereto so as to cover the through holes. The noise caused by a compression wave of air occurring between the blades of impeller and the inner face of casing is efficiently absorbed by a sound absorbing material disposed adjacent the blades.
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