FAN TUNNEL OF BLOWER

PROBLEM TO BE SOLVED: To provide a fan tunnel of a fan for reducing the noise level by reducing the spatial resonance sound without expanding the noise of a noise source or without relying on a sound absorbing material of a muffler, or without using a fan tunnel of a double structure and for prevent...

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Bibliographische Detailangaben
Hauptverfasser:	MIZUNO SUEYOSHI, KINOSHITA TSUTOMU, NITTA YOSHIMI, NODA SHINICHI
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING HEATING LIGHTING MECHANICAL ENGINEERING NON-POSITIVE DISPLACEMENT PUMPS POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC FLUIDS WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a fan tunnel of a fan for reducing the noise level by reducing the spatial resonance sound without expanding the noise of a noise source or without relying on a sound absorbing material of a muffler, or without using a fan tunnel of a double structure and for preventing the draft characteristic from being impaired. SOLUTION: In a fan tunnel of a fan with a plurality of blades rotating in the fan tunnel, air is sucked from a center inlet of the fan tunnel, and air is guided by a guide cylinder of the fan tunnel and discharged from an outer outlet. A flat surface is provided on the inner side of the fan tunnel in a range of 0.75 ≤ L ≤ 0.95. By providing the flat surface on the inner side of the fan tunnel, dominant frequencies can be distributed and the noise is effectively reduced. COPYRIGHT: (C)2004,JPO