The invention relates to the field of conveying materials by jetting fluid, in particular to a material-in-air conveying principle and technical scheme of conveying a material by fluid. The device comprises a power part, a base, a material conveying
system and a material air-wrapped feeding
system. A
spiral blade (10) is driven by the power part (1), the
spiral blade (10) provides power for the axial movement of materials when rotating, and the circumference movement of the
spiral blade (10) is converted to the axial movement of the materials.
High pressure air (8) enters an air
pipe cavity from a side air inlet, and is annularly jet into a venturi
pipe from a gas between the outer side of a
nozzle and the venturi
pipe. Due to the obvious action of Condar effect, the
high pressure air (8) jet from the gap flows forward closely to the inner wall of the venturi pipe, one layer of continuous air film is attached to the inner side of the venturi pipe, and middle materials are wrapped by the air and conveyed forward. The invention has the advantages of good
wear resistance property, small conveying resistance, large material to gas ratio, high efficiency, low price, small pump height, adaptability to the conveying of high-temperature materials, coarse
powder particles and the like.