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目前,我国电站锅炉吸风机多数采用单侧进气的Y4—73型系列产品,其叶片断面为机翼形。长期以来,这种叶片形状用于非电气除尘的燃煤锅炉机组上存在着较多的问题。因为采用干式除尘器时容易发生叶片磨损,当叶片磨穿灰粒进入叶片空腔内就会引起振动;如采用湿式除尘器,潮湿的细尘则粘附在叶片背面上,当其达到一定厚度后,由于离心力的增大,其中某一块或几块叶片的粘灰就会发生不均匀的脱落,也会因不平衡而引起振动。另外,单侧进风使叶轮产生巨大的轴向推力及由于悬臂轴结构的两支承轴承受力方式的不同,易使风
At present, most of the boiler suction fans in our country use Y4-73 series products with unilateral air intake, and the blade cross section is airfoil. This type of blade has long been a problem for use on non-electrically dedusted coal-fired boiler units. Because the use of dry precipitator prone to blade wear, when the blade worn ash particles into the vane cavity will cause vibration; such as the use of wet dust collector, wet fine dust is attached to the back of the blade, when it reaches a certain Thickness, due to the increase of centrifugal force, which one or a few pieces of the sticky ash will occur uneven off, but also due to imbalance caused by vibration. In addition, the one side into the wind so that the impeller produces a huge axial thrust and the cantilever shaft structure of the two bearing bearing force of different ways, easy to make the wind