| 摘要 |
<p>PURPOSE:To secure such a fan as making a blast quantity surely controllable, by stretching an elastic belt, having a lot of vanes outside, on a belt pulley and driving it, while performing an air blast with a volumetric variation among these vanes utilized. CONSTITUTION:Two belt pulleys 3 and 4 are stretched on with an elastic belt 5 having a lot of vanes 2 outside, and a casing provided with suction ports 8 and 9 and discharge ports 10 and 11 surrounds their peripheries. Since a clearance between mutual vanes 2 decreases at a straight line part but increases at a curve part, a volumetric variation among these vanes is utilized, constituting a displacement type fan. A revolving speed of each belt pulley is almost proportioned to a blast quantity so that this blast quantity is surely controllable.</p> |
