Patent GB-687541-A (GB)
Title: Pulverulent material classifying means
Inventor: NIEMITZ GERHARD
IPC: B07B7/08
Filed: 1951-02-19
Abstract: 687,541. Pneumatic separating. KENNEDY VAN SAUN MFG. & ENG. CORPORATION. Feb. 19, 1951, No. 3966/51. Class 11'7 Pulverulent material s classified by being air-borne upwardly through a conduit 12 terminating in an annular laterally directed discharge opening at an intermediate point within a vertical casing 8, 10, the material being discharged onto means 41, surrounding the discharge opening and spaced therefrom and the casing wall, which separate out the coarse particles and direct them to a bottom casing outlet 44 and divert the air with the remaining entrained material upwardly to a top casing outlet 24, and auxiliary air being introduced into the casing 8, 10 to flow upwardly across the lateral stream of material discharged through said discharge opening. As shown in Fig. 4, the casing comprises a lower conical portion 10, and an upper cylindrical portion 8 partially closed at the top by an annular ring 9. The conduit 12 extends centrally of the casing and terminates with a flared portion 14, 15 in a horizontal flange 16 underlying an annular horizontal portion 19 of a mushroom-shaped member 17, 18 to define therewith the annular discharge opening. The mushroom-shaped member 17, 18 is vertically adjustable on guides 26 via pendant rods 20 and the horizontal portion 19 thereof has an outwardly declining wear-resistant facing 28, 29, Fig. 3. Outwardly declined baffles 41, Fig. 6, are arranged in a vertical series spaced from the wall of a housing 33, 35, 36 and 37 which is in turn spaced from the casing 8, 10. The housng portion 36 guides a vertically adjustable baffle sleeve 46 adjacent the outlet 24 to provide a catchment 50 for further separation of coarser particles from the entrained material. The coarse particles separated out by the baffles 41, 46 fall via a housing outlet 39 to the casing outlet shoot 44 which extends from the apex of the conical casing part at the same inclination as the wall thereof. To provide further adjustment of the degree of fineness of the air-borne material leaving the outlet 24, an adjustable auxiliary air inlet 51 is provided in the casing wall 8, the auxiliary air passing between the casing and housing walls, up through the bottom housing outlet 39 to entrain some of the coarse particles, and out through the outlet 24. In an alternative construction, Fig. 7, the housing 33, 35-37 and the auxiliary inlet 51 are omitted, and a conical-section annular shell 67, 68 depends from the horizontal portion 65 of the conduit discharge outlet. The conduite is provided with an intermediate annular discharge formed between flaring portions 60, 63 of lower and upper conduit portions 58, 62 respectively, a vertically adjusted collar 71 being provided to regulate the discharge. The air from the intermediate discharge passage flows through the annular passage between the conical walls 10, 68 the outlet of which has an adjustable conical sleeve 80 to regulate the velocity of the air as it passes into the main separating chamber to act in the same manner as the auxiliary air of the Fig. 4 construction.