Patent GB-741122-A (GB)
Title: Improvements in or relating to a method of and apparatus for separating material from a liquid carrier
IPC: D21D5/06
Filed: 1951-04-12
Abstract: 741,122. Centrifugal separators. PAPER PATENTS CO. April 12, 1951 [July 1, 1950], No. 8520/51. Class 23. The centrifuge, Fig. 1, comprises a treating chamber 23 which has a hollow rotor 25 disposed therein and is mounted on a steel framework 21. The material to be treated is fed through a conduit 29 having a nozzle fitting 27 and passes into the chamber 23 through a deflector 63. The rotor is connected to a speed control unit 57 and comprises a shaft 39 having a tube 49 mounted thereon. The lower part of the tube 49 has staggered rectangular slots or symmetrically spaced circular ports. The treated material and the solids are discharged through pipes 35, 37, respectively. In a modification for de-aerating liquids the material to be treated is fed into the bottom of the centrifuge through a centrally disposed pipe and after passing through slots in the upper portion of the rotor is discharged downwardly into the treating chamber from which it is withdrawn through a T-piece connection, air being withdrawn from a T-piece connection which is disposed at the top of the centrifuge and connected to a vacuum pump. This centrifuge may be disposed in the vertical or horizontal position and its operating speed controlled according to the air content of the material to be treated. In a second modification, see Fig. 7, the rotor 111 is mounted on end shafts 115, 116 and is fed with material to be treated through a nozzle 127 which carries a baffle 133 for recirculating a part of the treated liquid to the rotor. The treated liquid is discharged from the top of the apparatus whilst the residue is discharged through a pipe 143. In a third modification, the apparatus comprises two concentrically arranged rotors, which are independently driven. The inner rotor is supported on a central shaft or on two end shafts. The outer rotor carries a ring gear which meshes with a second gear disposed within the treating chamber; the said gears being fabricated from fibrous or abrasive-resistant material. In a further modification, Figs. 15 and 16, for varying the air content of the material to be treated, the material is fed through a conduit 255 having a trough 247 and a separator rotor 265 therein. An adjustable vane 321 is positioned between the trough and the rotor for controlling the flow of liquid through the rotor and hence the amount of air which is to be removed. Each rotor bearing 273 is mounted on removable supports 275 and includes a gland ring 279. Water is fed to the gland rings and to the space between the supports 275 and the rotor by pipes 283, 281 respectively. When air is to be withdrawn from the material pipes 287 and 293 are connected to a pump and pipes 289 and 295 are connected to a barometric column. Again the apparatus may comprise a perforated rotor disposed in a T-piece having a supply pipe 331, see Fig. 17. The rotor is driven through a pulley 361 and is sealed in the upper portion of the T- piece which is connected to a source of reduced or increased pressure. The treated material is fed through the arms of the T-piece to a cross flow mechanism 339 having a central baffle 343. The deaerating and solid-removing apparatus may be arranged in series. Dimensions are given in the Specification.