| 摘要 |
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 impeller 1 disposed with a blade 1a so as to obliquely send an air to an axis of rotation 21, a fan casing 2 for covering this diagonal flow impeller 1, and a suction port 3 for sucking the fluid in the direction to the axis of rotation of this fan casing 2, the open front side of the suction port 3 is provided with a silencing portion comprising a shield 4 and a punching metal 5, 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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