The utility model provides a feed arrangement that is used for increase velocity of flow on cyclone, includes a hollow structural body, the 2nd hollow structural body and the 3rd hollow structural body, and a hollow structural body is round platform shape structure, and the 2nd hollow structural body is the tubular structure to the gradual change of ellipse circular cross section by circular cross section, and the 3rd hollow structural body is the square structure to the hollow structural body 0 gradual change by ellipse circular cross section, a hollow structural body 's throat end and the 2nd hollow structural body 's circular cross section end fixed connection, the 2nd hollow structural body 's ellipse circular cross section end and the 3rd hollow structural body 's ellipse circular cross section end fixed connection, a hollow structural body is the obtuse angle with the coaxial setting of the 2nd hollow structural body, the 2nd hollow structural body and the 3rd hollow structural body 's axis contained angle. The utility model discloses the simple structure makes velocity of flow increase when having the gas type of certain initial velocity or a hollow structural body that gas -solid mixed type through -put has the throat characteristic. The utility model is suitable for a various needs is improved on the separator of entry material speed.