GB767867A - Improvements in and relating to centrifugal strainer separators - Google Patents

Abstract

767,867. Centrifugal strainer separators. ESCHER WYSS AKT.-GES. Nov. 19, 1954 [Nov. 23, 1953], No. 33602/54. Class 46. In a multi-stage pusher type centrifugal strainer separator having coaxial drums, the inner one of two consecutive drums is encircled by the next outer drum and provides therebetween an annular gap through which material to be centrifuged at the outer drum is conveyed, transfer means being arranged to guide the material from the exit end of the inner drum to the entrance end of the outer one, the gap also providing space for collecting liquid centrifuged through the inner drum. A hollow rotary shaft 6 carries a push bottom 33, which itself carries a pusher ring 34, and a pusher ring 35, these moving over the inside faces of straining drums 29, 30, 31 mounted on a reciprocating shaft arranged in the hollow shaft 6. Material to be filtered falls from a shoot 37 on to a hopper 36 on the push bottom 33 and thence on to the innermost drum 29. The push bottom 33 on its movement to the right pushes the material, the leading part of which drops through a passage 38 on to the next drum 30. The return reciprocation displaces material through the passage 39 on to the outermost drum 31 from which repetition of the first movement displaces it into a delivery shoot. Water may be sprayed on the material e.g. as by a nozzle 42. Liquid drains away through outlets 40, 41. In a modification the middle drum, the outer pusher ring and the push bottom are carried on the shaft 6, the inner and outer drums and the middle push ring being on the reciprocating rod. As shown in Fig. 3, the hollow shaft 6 carries the drums, and the reciprocating rod 8, the pushers, and material passing from one drum to another is directed by hoppers 54, 55 to the remote ends of the drums. In another form, the shaft carries the pushers and the reciprocating rod the drums.