GB373117A - Improvements in or relating to centrifugal separators - Google Patents

Abstract

373,117. Centrifugal machines. FAWCETT, H. W., 3, Kent Road, Harrogate, Yorkshire. Nov. 11, 1930, Nos. 33919/30 and 22568/31. [Class 23.] A centrifugal separator which continuously discharges separated liquids also discharges sludge intermittently through peripheral outlets, the means for controlling the outlets being such that the outlets are closed when a predetermined weight or volume has been discharged. In the apparatus shown in Fig. 1, the two bowl parts 2a, 2b are secured by a lock ring 3, and a number of nozzles 10 are provided for the discharge of the sludge. A valve 11 normally closes each nozzle, and a tray member 13 is supported on a pivot 16 so that it can move directly over the nozzle 10 when the weight 20 is thrown out by centrifugal force. The opening 13a then passes over the valve pin 11a and the tray is moved intermittently by the rods 18, 30 to cause the valve 11 to slide away from the nozzle 10 and so permit the discharge of sludge into the tray. The plate 13b on the separator retains the sludge in the tray. Eventually the sludge causes the tray to overbalance the weight 20 and to move outwards. When it is clear of the plate 13b the sludge discharges over the top, and the tray again moves inwards to repeat the cycle of operations. In the modification shown in Fig. 2, a hollow ring 40 is arranged to slide up and down over the openings 9. It has apertures 41 which may be brought into register with the bowl discharge openings 9, and in its outer wall it has apertures 42 staggered with respect to the apertures 41. The ring 40 is operated hydraulically by liquid admitted by the valve 48 which may be controlled automatically or manually. When the valve 48 is turned to pass liquid through the pipe 46, the piston 43 is depressed until the openings 42 are closed by the ring 45 and the openings 41 register with the openings 9. The sludge then discharges into the ring 40, and when the space is filled the valve 48 is operated to pass liquid through the pipe 47. The piston 43 is then raised until the apertures 9 are closed and the apertures 42 are open, so that the sludge discharges from the ring and the cycle of operations can be repeated. In another modification the sludge outlets in the drum walls are opened and closed by valves controlled by pivoted levers the movements of which are determined by cups holding a quantity of liquid discharged from the separator. Specification 362,843 is referred to.