| 摘要 |
FIELD: machine building.SUBSTANCE: blower comprises an electric motor attached to the upper wall of a heat tunnel case with the motor flange being coupled with the upper wall 1 by bolts, and an impeller 3 coupled with the electric motor 2. The longitudinal axis of the electric motor and its shaft 4 is set vertically in respect to the longitudinal axis of the heat tunnel, one end of an extender 5 is connected immovably to the shaft, with the possibility of vertical alignment, the other extender end is fitted by an impeller 10. A hot air pressure blower 13 made as a box and fitted with holes in its lower wall is installed on the lower case wall, the impeller 10 is set in the cavity of the pressure blower 13 which is communicated with the blower air ducts 18 attached to the side case walls. Each air duct 18 is provided with holes directed to the side of the horizontal surface of a conveyor, the extender is set in the holes of the upper and lower case walls. The impeller comprises a round metal disk with blades, the end of every blade is inclined to the radial plane and has a root zone, a middle zone and an end zone along its height. The blade in its cross section is twisted around its symmetry axis in opposite directions so that its cross section is of a zigzag form. The blade twist angles in the section set closer to the blade root zone at the distance of 1/3 of the blade height fall within the range from 45° to 90°, and the blade twist angles in the section set at the distance of 2/3 of the blade height fall within the range from 15° to 45°. Each twist angle is placed between a tangent passing through the midpoint of the blade and a tangent passing through the extreme point of the blade.EFFECT: group of inventions provides for improved packing quality and the heat tunnel efficiency.3 cl, 11 dwg |
