Patent GB-709449-A (GB)
Title: Continuous action centrifugal separator
IPC: B04B3/00
Filed: 1951-09-28
Abstract: 709,449. Centrifugal-machines. SANCHEZ, F. G. Sept. 28, 1951 [Oct. 28, 1950], No. 22728/51. Class 23 [Also in Group XXXVII] A centrifugal machine for the continuous treatment of a magma comprises an inner distributing cone 27, an intermediate cone 34 for the removal of liquid, and an outer washing and drying cone 63 from the periphery of which washed and dried solids are discharged. Treating sugar. Massecuite supplied by a heated tube 20 to the rotary distributing cone 27 is delivered to the cone 34, rotating with the cone 27, for removal of green mollasses. After removal of the green mollasses the massecuite passes over the rotary washing and drying cone 63 which discharges sugar crystals from its larger end. The interior of the cone 63 is heated by hot air. The cone 63 may rotate with the cones 27, 34 or it may rotate at a lower speed. Charging. Massecuite is supplied to the rotating parts of the machine through a heated tube 2!0 having a rotary conveyor 21 and a fixed spreading plate 23. In one arrangement Fig. 8 (not shown) the massecuite is supplied to the tube through a flexible pipe which is constricted as the load on the motor driving the cones 27, 34 increases and the conveyer is driven by a separate motor the speed of which decreases as the load on the motor driving the cones 27, 34 increases. Rotor and screen construction; driving. The machine rotor comprises the cone 27 for distributing the massecuite supplied by the tube 20, the cone 34 for removing green mollasses from the massecuite and supplied from the larger end of the cone 27, and the cone 63 for washing and drying the massecuite from which the green molasses have been removed supplied from the larger end of the cone 34. Sugar crystals are discharged by spilling from the larger end of the cone 63. The cone 27 has rods 28 which facilitate the acceleration of the charge. The cones 34, 63 are imperforate except for slots 35 (at their larger ends and carry internal screens 37 which are supported by strips 36. Joints in the screens are oblique to the generators of the cones. Washing water is supplied to the cone 63 through the perforated ends of pipes 70, 71. As shown in Fig.2 the three cones are fixed to a common belt-driven shaft 30. In a modification, Fig. 7 (not shown) the cones 27, 34 are mounted on a belt-driven shaft. normally rotating within and at a greater speed than a hollow belt-driven shaft carrying the cone 63, provision being made to clamp the two shafts together and drive all the cones as a single unit. Discharging. The green mollasses from the cone 34 are discharged to a container 50 and led away by a pipe 48 to a closed sump (not shown), a fan being provided above the sump to create a partial vacuum in the container. The water containing mollasses discharged from the cone 63 is collected in a container 66'. The sugar crystals spilling from the cone 63 collect in a container 76. Cleaning and heating parts. Steam for cleaning is supplied by a pipe 81 and a pipe parallel to the wash-water pipe 71 and hot water for cleaning is supplied by a pipe 82. The supply tube 20 has a hot water jacket 22, and hot air is supplied to the interior of the cone 63 by a pipe 80. Dimensions and speeds of the rotary parts of the machine are given in the Specification.