| 摘要 |
<p>PURPOSE:To reduce driving power at a change of an inlet angle while improve performance when unnecessary to change the angle, by increasing clearances in both sides of a guide vane during the change of the inlet angle and removing the clearance when unnecessary to change the angle. CONSTITUTION:A chain wheel 2 is mounted to a rotary shaft of a guide vane 1 provided in a fluid flow passage of a blower, and an inlet angle beta of the vane 1 can be changed through a roller chain 3 wound on each chain wheel 2. A movable side plate 5 is interposed between the vane 1 and internal volute casing 9 and can be contacted to and separated from the casing 9 by a cylinder 4 with a spring driven by pressurized fluid. At operation, the plate 5 is pulled to a side of the casing 9 by the cylinder 4 by a clearance C to form clearances C1, C2 before and after the vane 1, under this condition the entrance angle beta of the vane 1 is changed. After changing, the plate 5 is moved rightward to eliminate the clearances C1, C2 and perform operation.</p> |
