Liquid purification or separation – Flow – fluid pressure or material level – responsive
Patent
1994-08-12
1997-04-08
Reifsnyder, David A.
Liquid purification or separation
Flow, fluid pressure or material level, responsive
210149, 2103601, 210369, 210418, 60527, 60529, 251 11, 494 2, 494 4, 494 26, 494 27, 494 56, F16K 3164
Patent
active
056184093
DESCRIPTION:
BRIEF SUMMARY
The invention relates to centrifuges for separating substances of different densities, for example, solid-liquid mixtures, with at least one device located for co-rotation with a rotating portion of the centrifuge and controlled by an also co-rotating mechanical actuator for determining the operation, for example, of drain valves, periodically operating discharge valves, sill height adjustment devices, pressure control devices, temperature control devices, and the like.
By operation determined by the controlled devices, there are to be understood externally controlled operating parameters, as these can be affected, for example, by sill height adjustment devices, discharge valves, residue drain valves and the like. Also included is the adjustment of operating conditions, that is control, for example, as a function of the turbidity of the concentrate, or the residual moisture in the solids. Particularly included are sill height adjustment devices, such as radially displaceable sill plates, two consecutively located sill plates of different diameters with controllable intermediate run-off for level reduction, sill plates connected to a controlled valve at greater diameter for lowering the level, outlet valves such as valves for draining sludge or a more or less large fraction of the bowl contents, e.g. closing of the valves while cooling the actuator either through a separate cooling medium or through exiting centrifuged medium, as well as residue discharge valves for the complete emptying or cleaning of the centrifuge, as is appropriate especially for perishable, explosive and/or radio-active materials, and cleaning for product change without stopping the machine. Finally, the prevention of operating stoppages forms part of the purpose of the operation, for which there are used primarily devices for overload protection, such as pressure control devices, for example, for grease expansion in the helix bearings, namely through increase in volume of the grease space by means of piston displacement, or else through relief valves. To prevent operating stoppages there are further used devices for controlling temperature, namely in the separating chamber as exit valves for hot liquid, gases or vapors and in the bearing space through valves for supplying lubricant/cooling liquid from a co-rotating reservoir or from outside the bowl, e.g. upon excessive heating of a bearing due to increased friction. Finally there can be provided devices for protecting against turning moment overload, which can cause interruption of the drive of the helix, e.g. due to friction heating, especially through a disengageable coupling. This listing of the devices for controlling the operation of the centrifuge in relation to the previously mentioned, fundamental purposes, does not purport to exhaust the areas of application of the actuators here under discussion.
The actuation of control devices inside a centrifuge, i.e. at rotating locations, is difficult and complicated to carry out from the outside and indeed is possible only under certain operating conditions. Thus, one can supply a control liquid through a stationary supply pipe, which extends into a circumferential trough (circumferential pockets) of the rotating centrifuge portion and from there exerts a control force, e.g. for operating a piston serving as the actuator of a control device, as a function of the centrifugal force resulting from the rate of rotation of the centrifuge. A control force which is specifically pressure dependent and therefore independent of centrifugal force could be provided by a pressure-transmitting liquid which is ducted through a rotating coupling from a stationary conduit into a rotating conduit, but the pressurized and leakproof rotating coupling is costly--see, for example, German Offenlegungsschrift (DE-OS) 30 09 669.
Thus, for example, to operate residue drain valves--the liquid residue remaining in the drum after separation is desirably removed, e.g. because it is ejected into the solids trough when the centrifuge is stopped or because it makes t
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US PTO 96-2774; An English Translation of SU 628957.
Flottweg GmbH
Reifsnyder David A.
Stapler, Esq. Alfred
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