Pressure screen with turbulence chamber means

Claim 1

Apparatus for treating a fibrous suspension of raw fibre stock to separate acceptable stock from waste matter including in combination, a casing, a generally cylindrical screen having a longitudinal axis, means mounting said screen in a fixed position within said housing with the longitudinal axis thereof generally horizontally disposed, said screen and said casing forming an outer chamber therebetween, a generally cylindrical rotor having an imperforate peripheral wall and a first closed end, means mounting said rotor within said screen for rotary movement around a generally horizontal axis, the peripheral wall of said rotor and said screen forming therebetween an inner elongated generally annular chamber, a turbulance chamber means defined by said casing and the second end of said rotor, a first inlet on said casing adjacent to said first rotor end for introducing raw fiber stock into said inner chamber, a first outlet on said casing for removing acceptable stock from said outer chamber means, a second outlet on said casing leading into the upper region of said turbulence chamber means for removing relatively light waste material, a third outlet on said casing communicating with the lower region of said turbulence chamber means, said third outlet functioning to remove relatively heavy waste matter, from said turbulence chamber means, a projection on said rotor at the second end thereof functioning to create turbulence within said turbulence chamber means and a second inlet in said casing for feeding diluting water into said turbulence chamber means to dilute material being introduced into the turbulence chamber means.