The invention discloses a Raymond mill
system with a draught fan free of dust retention. An
air current circulation milling discharging
system is formed by the draught fan, a Raymond mill, a
cyclone separation discharging device and an air return duct; a pressure-equalizing exhaust
branch pipe is connected with the upper end of a
cyclone pipe, multiple cyclones are arranged in the
cyclone pipe, the lower end of the cyclone pipe is connected with a cyclone separator in the tangent direction, and a lower pipe orifice of the cyclone separator immerges into a circulation water tank which is connected with the upper end of the cyclone pipe; and an
impeller of the draught fan is of a structure that blades are in a hollow and wedged shape and the backing plate is in a disc shape, and the
contour line of the appearance of the draught fan is an evolvent. According to the Raymond mill
system with the draught fan free of the dust retention, due to the fact that the cyclone pipe and the cyclones are arranged, low-resistance pressure-equalizing exhaust is achieved, and dust overflow caused by
positive pressure of the system is eliminated; by means of the circulation water tank, wet-method high-efficiency dust removal and mineral
powder recycling are achieved; and by means of the structure that the blades are in the hollow and wedged shape and the backing plate is in the disc shape, real-time cleaning of the dust on an
impeller of the draught fan is achieved, the
impeller strength of the draught fan is increased, the stability is enhanced, safety accidents caused by dust accumulation is effectively eradicated, and the application prospect is wide.