多少年来在谷物收获机上长期使用着低压离心风机。由于风机跨度较大,致使作用于清粮筛面上的风量不均,造成谷物清选质量差和谷物损失,甚致引起各种故障。特别是谷物联合收获机,近年来向“大型化”的方向发展甚快,致使其滚筒长度也随喂入量的增大而急剧增大。比如 For many years long-term use of low-pressure centrifugal fans on grain harvesters. Due to the large span of the fan, the air volume acting on the surface of the grain clearer is uneven, resulting in poor quality of grain clearing and cereal loss, which can cause various faults. In particular, the combined cereal harvester has been growing rapidly in recent years toward the “large-scale”, resulting in a sharp increase in the length of its drum as the feed volume increases. such as