Grate cooler fan with non-standard pipeline

The utility model discloses a grate cooler fan with a non-standard pipeline, which comprises a first pipeline, a second pipeline, a third pipeline and a fourth pipeline, the first pipeline is an equal-diameter pipeline, and the upstream end of the first pipeline is communicated with the output end of the fan through an air pipe; the second pipeline is an equal-diameter pipeline, and the downstream end of the second pipeline extends into the air chamber through an air pipe and blows air towards a grate bed for conveying cement clinker; the third pipeline is a reducing pipeline, the third pipeline comprises a narrow-diameter part, a reducing part and a wide-diameter part which are integrally formed, the narrow-diameter part is in sliding sealing connection with the first pipeline, and the wide-diameter part is in sliding sealing connection with the second pipeline; the connecting pieces are arranged at the joint of the narrow-diameter part and the first pipeline and the joint of the wide-diameter part and the s