Diagonal flow fan

Details Diagonal flow fan Diagonal flow fan

2007-08-07

2011-10-11

Nguyen, Ninh H (Department: 3745)

Rotary kinetic fluid motors or pumps

With sound or vibratory wave absorbing or preventing means...

C415S220000, C415S224000

Reexamination Certificate

active

08033783

ABSTRACT:
The present invention aims at providing a diagonal flow fan or a silencer for the diagonal flow fan, which have the same outer shape as a suction port and are compact, and can also obtain an effective sound absorbing effect of a moderate frequency range. In the diagonal flow fan comprising a diagonal flow impeller1disposed with a blade1aso as to obliquely send an air to an axis of rotation21, a fan casing2for covering this diagonal flow impeller1, and a suction port3for sucking the fluid in the direction to the axis of rotation of this fan casing2, the open front side of the suction port3is provided with a silencing portion comprising a shield4and a punching metal5, so that the noise of the moderate frequency range of 500 to 1000 Hz generated in the diagonal flow fan was suppressed.

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Japanese Office Action of Japanese Application 2006-342071.

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