A DEVICE FOR SEPARATING A LIQUID FROM A SLURRY AND COMPRISING A SPILLWAY

Abstract: A device for separating liquid (3) from a slurry (4) and which comprises a rotatable longitudinally extending drum (1) provided with an inlet at one end thereof, the mantle of said drum being provided with liquid passage openings (2) and internally having a helicoidally extending flange element (19) for feeding the slurry along the drum (1) and which follows the drum in the rotation movement of said drum, wherein a wall element (13) is positioned in the interior (5) of the drum, said wall element acting as a partition between the slurry department (14) of the drum and a spillway opening means (15). The invention makes possible to drive the drum directly and also to manufacture the device at lower costs. Said spillway opening means (15) is constituted by a plurality of outlet passages (16) extending through the mantle of the drum, and the interior of the drum limited by an end wall (7) which is connectable to a means (12) for driving and/or supporting the drum (1).

Description: A device for separating a liquid from a slurry and comprising a spillway The present invention concerns a device for separating a liquid from a slurry and which comprises a rotatable longitudinally extending drum provided with an inlet at one end thereof, the mantle wall of said drum being provided with water passage openings and internally having a helicoidal extending flange element for feeding the slurry along the drum and which follows the drum in the rotation movement of said drum, wherein a wall element is positioned in the interior of the drum said wall element acting as a partition between the slurry department of the drum and a spillway opening means. Such a device is already known by the Swedish publication No. 7613012-9. The object of the invention at first hand is to provide a device, of the kind stated above which makes possible to manufacture it at lower costs than before, but which is also well adapted to be driven directly by rotating the drum. Said object is being obtained with a device according to the present invention which is generally charac¬ terized by said spillway opening means being constituted by a plurality of outlet passages extending through the mantle of the drum and the interior of the drum being limited by an end wall which is connectable to means for driving and/or bearing of the drum. The invention will be described below as two preferred examples of embodiment with reference to the accompanying drawings, wherein fig. 1 shows a device schematically seen in perspective and partially broken up condition and fig. 2 shows a further embodiment of a separating device. OMPI fa . m?o . A separating drum as shown in fig.- 1 and which makes a part of a device for separating a liquid according to the invention is indicated with 1 and comprises a plurality of openings 2 distributed peripherally and longitudinally of the drum and penetrating the mantle thereof. Said openings are intended to act as passageways for liquid 3 separated from a slurry 4 charged into the internal department 5 of the drum by means of a charging device 6 which extends into the drum 1 from one end 1A thereof. The other end IB is provided with an end wall 7 closing the interior of the drum. The drum 1 is supported and rotated by means of a plurality of supporting rollers preferably arranged in pairs, said rollers for instance supporting the drum at one end 1A thereof along a running surface 9 which extends along the periphery of the drum, and a drive shaft 11 respectively, the latter connected to the end wall 7 of the drum at the central part 10 thereof, said shaft in turn being connected to a drive motor 12 which is supported by a structure not shown in the drawings. It is also possible for instance to provide the drum with an end wall at both of its ends and in that case the drum can be driven and/or supported by means of driving and/or supporting means at each of the end walls. In the vicinity of said end wall 7 the interior of the drum is provided with a partition wall 13 which is intended for separating a slurry receiving department 14 in the interior 5 of the drum from an opening means 16 being part of a spillway. Said partition wall 13 can be substituted by a ring shaped narrowing plate connected to the internal mantle surface 1C of the drum from which it extends in the direction towards the centrum of the drum 1 and limited by a free inner edge 13A intended to be passed by excess slurry 17 spilled from the interior 5 of the drum. The opening means 16 at one side of said partition wall 13 comprises a plurality of outlet passages extending through the mantle surface in a department 18 limited by said partition wall 13 and said end wall 7. Preferably the openings are equally distributed along the periphery of the drum and may be elongated in that direction. . ~ A helicoidal flange element 19 having a varying extension in direction from the drum is positioned inside of the latter and is adapted to follow the drum 1 in the rotation movement of the latter and consequently to feed the slurry 4 along the drum in the direction preferably towards an opening 20 in one end 1A of the drum, through which the dewatered material 21 is being discharged for collection and removal. The liquid 3 which flows through the openings 2 of the drum mantle will be collected in a department 22 below the drum 1 and directed as shown by the arrow 23 to a discharge pipe 24. Surplus slurry 17 flowing over the inner edge 13A of the wall 13 will be received by a plate 25 positioned between the department 22 and an outlet opening 26 for discharge of the surplus slurry 17 from where the latter may be conducted back into the drum again. A sensor means 27 can suitably be provided in connection with the spillway drain 15 in order to control the amount of slurry delivered into the dewatering device and to interrupt the delivery of slurry 4 to the interior 5 of the drum when the amount of slurry passing the wall edge 13A is too high. The openings 2 of the drum mantle may be cleansed by means of a rotating brush 28, the bristles of said brush being adapted to penetrate into the openings 2 and cleanse them from impurities. In fig. 2 is shown a further preferred embodi¬ ment of a separating device made according to the invention, whereby parts which functionally correspond to similar parts in the device according to fig. 1 have been given correspon¬ ding reference numerals. In fig. 2 is further shown a cover 29, which detachable can be connected to a stationary housing- portion 31, whereby the device can be easily inspected. The charging device 6 is also different from the one described above but the function is generally the same. At the top of the housing portions is provided an air outlet passage 32 through which air can be discharged from the interior of the device, preferably by means of a fan device 33. The invention is not limited by the two examples of embodiment described above and illustrated in the drawings, but may be varied within the range of the accompanying claims. By way of example the drum 1 may be adapted to be variably adjustable to a desired angle of elevation. c::?ι

Claims: C l a i m s 1. A device for separating a liquid (3) from a slurry (4) and which comprises a rotatable longitudinally extending drum (1) provided with an inlet at one end thereof, the mantle wall of said drum being provided with liquid passage openings (2) and internally having a helicoidally extending flange element (19) for feeding the slurry along the drum and which follows the drum in the rotation movement of said drum, wherein a wall element (13) is positioned inside of the drum mantle (5), said wall element acting as a^ partition between the slurry departmentQ.q) of thedrum (1) and =- a spillway opening means (15), c h a r a c t e r i z e d b y said spillway opening means (15) being constituted by a plurality of outlet passages (16) extending through the mantle of the drum and the interior of the drum being limited by an end wall (7) which is connectable to means (12) for driving and/or supporting the drum. 2. A device for separating a liquid from a slurry according to claim 1, c h a r a c t e r i z e d b y said outlet passages (16) being positioned within a chamber (18) which is limited by said wall element (13) and said end wall (7). 3. A device according to claim 2, c h a r a c t e ¬ r i z e d b y a drive and bearing device (12) being connected with the central portion(lOjof saidend wall (7). " ^ 4. A device according to anyone of the preceding claims, c h a r a c t e r i z e d b y said wall element (13) being a ring shaped narrowing disc member (13) connected to the internal surface (1C) of the mantle of the drum and extending in a direction towards the centrum of the drum (1) where it is limited by a free edge (13A) adapted to be overflowed by surplus slurry (17) . 5. A device according to anyone of the preceding claims, c h a r a c t e r i z e d b y said wall element (13) being positioned near one end of said helicoidally extending flange element (19) near the inlet portion of the latter, and an outlet passageway being positioned near the opposite end of said flange element for discharge of dewatered material (21) fed through the drum by means of said flange element (19). 6. A device according to anyone of the preceding claims, c h a r a c t e r i z e d b y outlet passages being constituted by openings (16) which extend through the mantle of said drum and are equidistantly distributed along the periphery of said mantle. 7. A device according to claim 6, c h a r a c t e ¬ r i z e d b said openings (16) being extended along the periphery of the drum (1) . C PI ■ -. vi?o

Inventors: ANDERSSON SOEREN, JOHANSSON INGVAR, ANDERSSON, SOEREN, JOHANSSON, INGVAR
Applicants: ROTO SIEVE AB, ROTO-SIEVE AB
Application year: 1983
Main classification: B01D33
IPC codes: B01D33