| 摘要 |
A volute housing is disclosed for use with a centrifugal fan, blower or the like, and includes a housing body defined by opposite spaced sidewalls, a volute peripheral wall disposed between the sidewalls and defining therewith and with an impeller a volute chamber, and the sidewalls each having a generally minimum radial dimension located at a tongue of the volute chamber which progressively increases to a maximum radial dimension located at a throat of the volute chamber. The sidewalls include first sidewall portions which are generally parallel to each other between the tongue and a transition zone 180 DEG therefrom, and second sidewall portions of the sidewalls from the transition zone to the volute throat at approximately 360 DEG are in diverging relationship in a direction away from the transition zone whereby fluid/air flowing through the housing body expands progressively axially outwardly as it flows between and along the second sidewall portions. |
