| 摘要 |
FIELD: ventilation system. ^ SUBSTANCE: invention relates to main unit of centrifugal fans used for ventilation of industrial and living rooms and servicing of different technological processes where liberation of hot gases, smoke and harmful admixtures takes place. Invention is aimed at reduction of area of heat transfer from hub of impeller to shaft of centrifugal fan motor and creation of air flow to cool front end plate of motor and hub. According to invention, impeller of centrifugal fan consists of hub, main and cover flat disks and working blades. Hub is provided with cylindrical boss from side of mounting of main disk and through holes located around axle of rotation of impeller. Axes of through holes are parallel to axle of rotation of impeller, and their number and diameter are chosen so that summary area of said holes is equal to 0.1-3.0% of area of intake hole of centrifugal fan, and axes of said through holes are arranged over circumference of diameter equal to Dh+2.5d10%. Distance between two adjacent axes of through holes is 1.5d10%. ^ EFFECT: increased thermal stability, reliability and reduced cost of operation of centrifugal fans. ^ 2 dwg |
