Abstract: A feed accelerator system for use in a centrifuge, the system comprising a conveyor hub rotatably mounted within a rotating bowl, the hub including an inside surface and an outside surface. At least one feed slurry passageway is disposed between the inside surface of conveyor hub and the outside surface of the conveyor hub, and at least one helical blade having a plurality of turns is mounted to the outside surface of the conveyor hub. A vane apparatus is associated with the passageway and is disposed between two adjacent turns of the helical blade. The vane apparatus may include an inwardly extending baffle and/or an outwardly extending accelerator vane. Alternatively, a U-shaped channel may be associated with the passageway, the U-shaped channel including a plurality partitions attached to the discharge end of such channel so as to form a plurality of discharge channels and a flow directing and overspeeding vane disposed within each channel, each vane having a different forward discharge angle.

Abstract: A method and apparatus for separating solids from a liquid in a slurry using a centrifuge employing two simultaneous rates of rotation is disclosed. In the preferred form, the device includes an external bowl having at one end a hub with a central trough therein, plural passages from said trough through said hub extending radially outwardly to contact newly delivered slurry against the wall of the bowl, the wall comprising an elongate right cylinder construction terminating at a flange. A second portion of the bowl is tapered on the exterior and defines a rising beach portion on the interior. Inside, an elongate screw conveyor is deployed and is driven by the input velocity of an external motor rotating said bowl and said conveyor. The shaft connects to the conveyor through a differential motor which provides a scrolling speed of up to about 10 rpm. At the remote end, the conveyor tapers to cooperate with the beach portion of the bowl to scroll dry solids onto the beach and through an outlet.

Abstract: A decanter centrifuge for separating a feed suspension of a particular solid material in a liquid into two fractions, i.e. a heavy fraction containing heavy particles and a light fraction containing light particles, or no particles at all, is described. The centrifuge has a rotatably mounted elongated bowl having closed ends with a side wall extending therebetween. A helical scroll is rotatably mounted coaxially within the bowl, and the bowl and the scroll may be rotated at different rotational speeds. A pipe coaxially mounted in a tubular shaft and rotatably supporting the scroll, feeds the suspension into the bowl. Several outlets in the wall of the bowl discharge the heavy fraction from the bowl. The light fraction travels through the length of the bowl by the helical scroll and is discharged from outlets located downstream from those that discharge the heavy fraction. The delivery region is also nearer to the outlets for the heavy fraction than to the outlets for the light fraction.

Abstract: A decanter centrifuge assembly comprises a bowl, a screw conveyor disposed inside the bowl for rotation at a speed different from an angular velocity of the bowl, and a harmonic drive unit including a circular spline drivingly connected to the conveyor. The harmonic drive unit further includes a flexible spline drivingly connected to the bowl and a wave generator disposed in contact with the flexible spline for distorting the flexible spline and enabling a driving of the flexible spline at a rate of rotation incrementally differing from a rate of rotation of the circular spline. The flexible spline has teeth partially meshing with teeth on the circular spline. The harmonic drive additionally has a lubrication system with a skimmer tube for paring lubricating fluid from a pool in an outer casing of the harmonic drive. A shaft coupled to the wave generator has a channel communicating with the skimmer tube.

Abstract: A feed accelerator system for use in a centrifuge, the system comprising a conveyor hub rotatably mounted within a rotating bowl, the hub including an inside surface and an outside surface. At least one feed slurry passageway is disposed between the inside surface of conveyor hub and the outside surface of the conveyor hub, and at least one helical blade having a plurality of turns is mounted to the outside surface of the conveyor hub. A vane apparatus is associated with the passageway and is disposed between two adjacent turns of the helical blade. The vane apparatus may include an inwardly extending baffle and/or an outwardly extending accelerator vane. Alternatively, a U-shaped channel may be associated with the passageway, the U-shaped channel including a plurality partitions attached to the discharge end of such channel so as to form a plurality of discharge channels and a flow directing and overspeeding vane disposed within each channel, each vane having a different forward discharge angle.

Abstract: A decanter centrifuge comprises a bowl rotatable about a longitudinal axis, the bowl being provided with a cake discharge opening at one end and a liquid phase discharge opening. The bowl has a cylindrical portion and a beach portion disposed between the cylindrical portion and the cake discharge opening. A beach area is provided on an inner surface of the bowl at the beach portion of the bowl, the beach area including a first section and a second section with the second section located between the first section and the cake discharge opening. The second section of the beach area has a less steep or smaller slope than the first section. A conveyor is at least partially disposed inside the bowl for rotation about the longitudinal axis at an angular speed different from an angular rotational speed of the bowl. The conveyor includes a helical screw disposed inside the bowl for scrolling a deposited solids cake layer along the inner surface of the bowl towards the cake discharge opening.

Abstract: Discharge passages for concentrated and separated liquids are separately formed in shafts of a rotary bowl 1 and a screw conveyor 2. In an inlet passage of the radial discharge passage leading from the inside of the rotary bowl 1 to the discharge passage in the shaft, an annular space is divided into sectors by a plurality of deceleration vanes 23, 24 which are mounted on the screw conveyor 2 and extend in a radial direction from the axis of the machine.

Abstract: A feed accelerator system for use in a centrifuge, the system comprising a conveyor hub rotatably mounted substantially concentrically within a rotating bowl, the conveyor hub including at least one passageway connecting an inside surface of the conveyor hub to an outside surface of the conveyor hub for a feed slurry exiting the conveyor hub. The passageway may be associated with a variety of feed slurry accelerator enhancements such as a baffle extending into a slurry pool formed on the inside of the conveyor hub, a divider, a U-shaped channel, an extension tube, and/or a flow directing and overspeeding member. These accelerator enhancements may be combined within the passageway or incorporated into a feed slurry accelerating nozzle apparatus remoyably secured to the passageway. The passageway and/or the nozzle apparatus may include a cross-sectional area having a longer axis approximately parallel to the conveyor hub axis of rotation.

Abstract: A feed accelerator system for use in a centrifuge, the system comprising a conveyor hub rotatably mounted substantially concentrically within a rotating bowl, the conveyor hub including at least one passageway connecting an inside surface of the conveyor hub to an outside surface of the conveyor hub for a feed slurry exiting the conveyor hub. The passageway may be associated with a variety of feed slurry accelerator enhancements such as a baffle extending into a slurry pool formed on the inside of the conveyor hub, a divider, a U-shaped channel, an extension tube, and/or a flow directing and overspeeding member. These accelerator enhancements may be combined within the passageway or incorporated into a feed slurry accelerating nozzle apparatus removably secured to the passageway. The passageway and/or the nozzle apparatus may include a cross-sectional area having a longer axis approximately parallel to the conveyor hub axis of rotation.

Abstract: A process for the obtention of must from bunches of grapes, comprising at least one phase of centrifugation of the said bunch, capable of bringing about separation of the must from the pomace prior to subjecting the must to fermentation.

Abstract: Centrifugal apparatus for the continuous separation of solids-liquid mixtures and the internal washing of separated solids is provided with one or more conduits to deliver washing liquid into centrifugally sedimented solids tumbling and suspending these solids in washing liquid. A distal end of each wash conduit is positioned in close proximity to the inner surface of the centrifuge bowl near the conveyor blade which is adapted to contact the solids upon separation and propel separated solids toward the solids discharge port. The invention includes centrifugal apparatus provided with plurality of cutting tools such as knife blades adapted to cut and separate the sedimented solids. In another aspect of the invention centrifugal apparatus is provided with one or more dip weirs dividing the centrifugally separated liquid pool in the bowl into axially adjacent zones with suitable a passageway for transfer of liquids and solids between adjacent zones.

Abstract: A decanter centrifuge comprises a bowl having a plurality of cake discharge openings at one end and a liquid phase discharge opening. The bowl is rotatable about a longitudinal axis, while the cake discharge openings are disposed in a plane oriented transversely relative to the longitudinal axis. The bowl has a cylindrical portion and a beach portion between the cylindrical portion and the cake discharge openings. A conveyor is disposed at least partially inside the bowl for rotation about the longitudinal axis at an angular speed different from an angular rotational speed of the bowl. The conveyor includes a helical screw disposed inside the bowl for scrolling a deposited solids cake layer along an inner surface of the bowl towards the cake discharge openings. A feed element extends into the bowl and the conveyor for delivering a feed slurry into a pool inside the bowl.

Abstract: A feed accelerator system for use in a centrifuge, the system comprising a conveyor hub rotatably mounted substantially concentrically within a rotating bowl, the conveyor hub including at least one passageway connecting an inside surface of the conveyor hub to an outside surface of the conveyor hub for a feed slurry exiting the conveyor hub. The passageway may be associated with a variety of feed slurry accelerator enhancements such as a baffle extending into a slurry pool formed on the inside of the conveyor hub, a divider, a U-shaped channel, an extension tube, and/or a flow directing and overspeeding member. These accelerator enhancements may be combined within the passageway or incorporated into a feed slurry accelerating nozzle apparatus removably secured to the passageway. The passageway and/or the nozzle apparatus may include a cross-sectional area having a longer axis approximately parallel to the conveyor hub axis of rotation.

Abstract: A decanter centrifuge comprises a bowl and a worm or screw type conveyor. The bowl is rotatable about a longitudinal axis and has a cake discharge opening at one end and a liquid phase discharge opening. The conveyor includes a conveyor hub having at least a portion disposed inside the bowl for rotation about the longitudinal axis at an angular speed different from an angular rotational speed of the bowl. The conveyor further includes a helical screw or worm attached to the conveyor hub and disposed inside the bowl for scrolling a cake layer along an inner surface of the bowl towards the cake discharge opening. An adjustable component on the hub forms a gap between the hub and the inner surface of the bowl so that the gap has a size adjustable independently of hub rotation speed. The adjustable gap enables an optimization of the moisture content of cake exiting the bowl at the cake discharge opening for a given solids throughput and cake rheology.

Abstract: A feed accelerator system for use in a centrifuge, the system comprising a conveyor hub rotatably mounted within a rotating bowl, the hub including an inside surface and an outside surface. At least one feed slurry passageway is disposed between the inside surface of conveyor hub and the outside surface of the conveyor hub, and at least one helical blade having a plurality of turns is mounted to the outside surface of the conveyor hub. A vane apparatus is associated with the passageway and is disposed between two adjacent turns of the helical blade. The vane apparatus may include an inwardly extending baffle and/or an outwardly extending accelerator vane. Alternatively, a U-shaped channel may be associated with the passageway, the U-shaped channel including a plurality partitions attached to the discharge end of such channel so as to form a plurality of discharge channels and a flow directing and overspeeding vane disposed within each channel, each vane having a different forward discharge angle.

Abstract: A centrifugal separator for a flowable mixture having a housing rotatable defining a separation chamber. At least one magnet is carried by the housing and is rotatable therewith to create a magnetic field within the housing with the magnetic lines of force carried around the axis of rotation during rotation of the housing. The chamber is divided into sub-chambers by radially extending baffles. The mixture is retained in each sub-chamber during housing rotation so as to stabilize the mixture and rotate it together with the housing. Housing scrapers face the inside surface of the housing to remove from that surface material which is attracted to the magnet. This action tends to draw the molecules of the mixture into alignment with the rotating lines of force thereby polarizing the molecules and decreasing molecular bonding. The centrifugal action causes the polarized molecules with decreased bonding, to move apart with the heavier molecules moving radially outwards further from the lighter molecules.

Abstract: In a solid-jacket centrifuge drum for separating out a liquid phase, a weir is rotatable with the drum around an axis, is disposed in a path of the separated out liquid phase and has at least one channel for the separated out liquid phase. A choke plate regulates flow through the at least one channel in the weir and thereby the level of liquid inside the drum. The choke plate is stationary relative to the rotation of the weir and the drum and is axially displaceable relative to the weir to form a gap therebetween for the separated out liquid phase. The gap has a distance which is varied with the axial displacement of the choke plate.

Abstract: Material separating apparatus comprising a rotatable main body (13) and a rotatable rotor (14) disposed within the main body. The rotor 14 comprises first and second end walls (16, 17) spaced apart from one another with a rotor chamber therebetween, with a plurality of generally radially extending blades (18) extending between the first and second end walls thereby separating the rotor chamber into a plurality of sub-chambers. A feed inlet chamber is disposed between the main body and the first end wall. The end walls have a circumferential clearance for permitting the flow of material into and the discharge of the heavier component out of the rotor chamber. A generally centrally disposed discharge is in communication with the rotor chamber for discharging the lighter component from the rotor chamber.

Abstract: A decanting type centrifuge comprising a bowl which rotates about a horizontal or vertical axis and contains a helical screw conveyor for separating a slurry fed to the bowl into its constituent solids and liquid, the scroll being arranged to rotate at a differential speed within the bowl and wherein at least some of the flights of the scroll conveyor are inclined backwards relative to the solids discharge end of the bowl.

Abstract: A feed accelerator system for use in a centrifuge, the system comprising a conveyor hub rotatably mounted within a rotating bowl, the hub including an inside surface and an outside surface. At least one feed slurry passageway is disposed between the inside surface of conveyor hub and the outside surface of the conveyor hub, and at least one helical blade having a plurality of turns is mounted to the outside surface of the conveyor hub. A vane apparatus is associated with the passageway and is disposed between two adjacent turns of the helical blade. The vane apparatus may include an inwardly extending baffle and/or an outwardly extending accelerator vane. Alternatively, a U-shaped channel may be associated with the passageway, the U-shaped channel including a plurality partitions attached to the discharge end of such channel so as to form a plurality of discharge channels and a flow directing and overspeeding vane disposed within each channel, each vane having a different forward discharge angle.

Abstract: An apparatus for the centrifugal separation of a solid-liquid mixture including an elongate centrifuge drum rotatable about a central axis, a coaxially located conveyor worm within the drum having worm helix flights on a worm drum therein, an opening for the discharge of a light fraction and an opening for the discharge of a heavy fraction, the opening for the discharge of the light fraction located in a radius from the drum axis less than the radius of the worm drum and the opening for the heavy fraction being located at a radius relative to the axis of the drum less than the radius of the worm drum.

Abstract: Discharge passages for concentrated and separated liquids are separately formed in shafts of a rotary bowl 1 and a screw conveyor 2. In an inlet passage of the radial discharge passage leading from the inside of the rotary bowl 1 to the discharge passage in the shaft, an annular space is divided into sectors by a plurality of deceleration vanes 23, 24 which are mounted on the screw conveyor 2 and extend in a radial direction from the axis of the machine.

Abstract: A feed accelerator system for use in a centrifuge, the system comprising a conveyor hub rotatably mounted substantially concentrically within a rotating bowl, and an accelerator including a cone-shaped inside surface disposed between an accelerator base and an accelerator small diameter section. The accelerator is secured proximately to its base within the conveyor hub so that the accelerator rotates with the conveyor hub. A distributor including a distributor surface having no sharp bends or junctions is secured to the small diameter section. A plurality of accelerator vanes are disposed on the cone-shaped inside surface and extend proximately from the small diameter section and terminate at a location on the cone-shaped inside surface proximate to the accelerator base so that an unvaned portion of the cone-shaped inside surface forms a smoothener section.

Abstract: A liquid accelerator system for use in a centrifuge, the system comprising a conveyor hub rotatably mounted within a rotating bowl, the hub including an inside surface and an outside surface. At least one feed slurry or wash liquid passageway is disposed between the inside surface of conveyor hub and the outside surface of the conveyor hub. A plurality of outwardly extending extensions is associated with each passageway. In the preferred embodiment, the extensions having an axis oriented parallel to and at forward angles to the radial direction of the conveyor hub at the passageway are U-shaped channels. The extensions having an axis oriented at reverse angles to the radial direction of the conveyor hub at the passageway are full channels. A plurality of partitions extends in a circumferential direction from the discharge end of each U-shaped channel and each full channel so as to form a plurality of discharge channels.

Abstract: A feed accelerator system for use in a centrifuge, the system comprising a conveyor hub rotatably mounted within a rotating bowl, the hub including an inside surface and an outside surface. At least one feed slurry passageway is disposed between the inside surface of conveyor hub and the outside surface of the conveyor hub, and at least one helical blade having a plurality of turns is mounted to the outside surface of the conveyor hub. A vane apparatus is associated with the passageway and is disposed between two adjacent turns of the helical blade. The vane apparatus may include an inwardly extending baffle and/or an outwardly extending accelerator vane. Alternatively, a U-shaped channel may be associated with the passageway, the U-shaped channel including a plurality partitions attached to the discharge end of such channel so as to form a plurality of discharge channels and a flow directing and overspeeding vane disposed within each channel, each vane having a different forward discharge angle.

Abstract: A liquid-solids separator, or centrifuge, of the type having a screw conveyor is provided with a series of offset conveyor flights. A spacer is positioned within the offset of the conveyor flights to form a channel therein. Rinse liquid is introduced into the channel through the central hub of the conveyor. The channel directs the rinse liquid into the heavy phase cake. An opening may be provided at various radial distances for varying the position of introduction of the rinse liquid from the channel. The amount of rinse liquid introduced through various channels formed by the series of offset conveyor flights may also be varied.

Abstract: A continuous decanter assembly suitable for processing nuclear materials comprises a mechanical assembly for driving a decanter bowl and an Archimedean screw. Sealing structure is provided to enable the decanter bowl and screw to be disconnected from the mechanical assembly and accessed by an operator without risk of nuclear contamination.

Abstract: When a screw-conveyor centrifuge is turned off and its rotation speed diminishes to the point where the centrifugal force is smaller than the force of gravitation, the liquid ring formed inside the centrifuge bowl under the centrifugal force collapses, and a detrimental discharge of liquid takes place at the solids discharge of the centrifuge. In accordance with the method of this invention, the rotation speed of the centrifuge bowl (2) and/or of the screw conveyor (4) is briefly abruptly changed immediately before this critical rotation speed is reached, so that the liquid ring is caused to spiral toward the liquid discharge openings (5) at the other end of the centrifuge (1) by the screw helices (3) of the screw conveyor (4).

Abstract: The material settling on the inside of the centrifuge drum during operation of centrifuges causes imbalances on account of the unavoidable nonuniform mass distribution, which imbalances lead to vibrations and the associated high level of solid-borne sound and bearing wear. The centrifuge drum shaft (15) is supported by an active (variable pressure) hydraulic bearing support (10) that is relatively simple in design and inexpensive to manufacture for this centrifuge application.

Abstract: A feed accelerator system for use in a centrifuge, the system comprising a conveyor hub rotatably mounted substantially concentrically within a rotating bowl, the conveyor hub including at least one passageway connecting an inside surface of the conveyor hub to an outside surface of the conveyor hub for a feed slurry exiting the conveyor hub. The passageway may be associated with a variety of feed slurry accelerator enhancements such as a baffle extending into a slurry pool formed on the inside of the conveyor hub, a divider, a U-shaped channel, an extension tube, and/or a flow directing and overspeeding member. These accelerator enhancements may be combined within the passageway or incorporated into a feed slurry accelerating nozzle apparatus removably secured to the passageway. The passageway and/or the nozzle apparatus may include a cross-sectional area having a longer axis approximately parallel to the conveyor hub axis of rotation.

Abstract: A liquid accelerator system for use in a centrifuge, the system comprising a conveyor hub rotatably mounted within a rotating bowl, the hub including an inside surface and an outside surface. At least one feed slurry or wash liquid passageway is disposed between the inside surface of conveyor hub and the outside surface of the conveyor hub. A plurality of outwardly extending extensions is associated with each passageway. In the preferred embodiment, the extensions having an axis oriented parallel to and at forward angles to the radial direction of the conveyor hub at the passageway are U-shaped channels. The extensions having an axis oriented at reverse angles to the radial direction of the convey hub at the passageway are full channels. A plurality of partitions extends in a circumferential direction from the discharge end of each U-shaped channel and each full channel so as to form a plurality of discharge channels.

Abstract: In a horizontal centrifuge, a bowl rotates in the same direction as a screw internally of the bowl. The bowl and screw connect to a three input gear box which rotates the bowl and screw at a small differential, or the scrolling rate. A separate motor running at a variable rate connects to the third gear box input and thereby reduces the scrolling rate. A feedback loop connects to the motor to vary the motor speed so that the scrolling rate is varied. A maindrive motor rotates the bowl which then couples through the gear box to rotate the screw and thereby furnish the power to rotate the bowl and screw.

Abstract: A decanter centrifuge including a drum that is rotatably journalled at its ends includes a separating compartment defined by end walls and a rotatably journalled conveyor disposed in the separating compartment and rotatably journalled in two bearings, one located at the free end of a trunnion projecting into the conveyor body. The separating compartment has a length to diameter ratio greater than four and the trunnion has a length in the range from 0.5 to 3 times the largest diameter of the separating compartment. Due to the short distance between the conveyor bearings, the rigidity of the conveyer increases, thereby increasing the critical RPM of the drum.

Abstract: A feed accelerator system for use in a centrifuge, the system comprising a conveyor hub rotatably mounted substantially concentrically within a rotating bowl, and an accelerator including a cone-shaped inside surface disposed between an accelerator base and an accelerator small diameter section. The accelerator is secured proximately to its base within the conveyor hub so that the accelerator rotates with the conveyor hub. A distributor including a distributor surface having no sharp bends or junctions is secured to the small diameter section. A plurality of accelerator vanes are disposed on the cone-shaped inside surface and extend proximately from the small diameter section and terminate at a location on the cone-shaped inside surface proximate to the accelerator base so that an unvaned portion of the cone-shaped inside surface forms a smoothener section.

Abstract: A decanter centrifuge comprises a drum (1) with a conveyor (2) containing an inlet (4). The liquid to be separated flows in a jet centrally into the inlet (4) towards an end wall (11 ), at which the liquid is radially distributed and flows axially onwards towards the second end wall (13) through an area of the inlet (4) free of members imparting an angular velocity to the liquid. The inlet (4) is provided with inlet apertures (6) positioned on a radius larger than the radius to the overflow edge (9) at the liquid discharge. The design of the inlet (4) implies that the free liquid surface in the inlet during operation is drawn far towards the axis of the drum, thereby causing excess energy supplied to the liquid during acceleration to the angular velocity of the conveyor (2) to be dissipated in the comparatively thick liquid layer before the liquid discharges into the separation space (7) through the inlet apertures (6).

Abstract: A vertically oriented centrifuge swivably engaged to a support structure so as to enable the centrifuge to attain an optimal operational attitude. The centrifuge includes a bowl, a screw conveyor disposed within the bowl, a hub disposed within the upper portion of the screw conveyor wherein the screw conveyor and hub define a separation chamber, and a plurality of separating discs disposed in the separation chamber and arranged in superimposed layers upon the hub.

Abstract: The conveyor of a decanter centrifuge includes a small outside diameter central hub extending for at least a portion of the longitudinal length. On the hub is attached a series of longitudinally- and radially-extending shaped ribs, which in turn attach to larger ribs that transverse an open feed zone. The longitudinal and transversing ribs support a ribbon conveyor flight. The open feed zone serves to decrease feed solids degradation. The ribs outside the feed zone serve to improve interface stability and minimize washout. The overall structure of the conveyor is mechanically stiffer and less prone to vibration. The conveyor is lighter and less expensive to construct.

Abstract: An apparatus is provided for the wet-mechanical separation of solids within a parting liquid into floats and sinks according to their density which includes a container rotatable about an axis provided with at least one opening for the admission of said solids to be separated and at least one separate opening for the discharge of the sinks, the floats and the parting liquid. A screw conveyor for separating the solids is arranged in the container. The screw conveyor is rotatable about the container axis with one set of helices for engaging the floats and another set of helices for engaging the sinks. A diaphragm plate is arranged axially on the screw conveyor between the admission opening for the solids to be separated and the discharge opening for the sinks such that one part of the screw conveyor conveys the sinks to the sinks discharge opening with its helices and another part of the screw conveyor conveys the floats to the floats discharge opening with its helices.

Abstract: A decanter centrifuge is provided with a dual motor drive for purposes of start-up and efficient operation. The two motors are coupled together during, at least, the start-up of the centrifuge rotation so as to provide the desired power requirements and to reduce the thermal load on the motors. After reaching operational speed, a first motor continues to drive the centrifuge at the desired operational speed and the second motor may be disengaged from operation. The dual motor drive may be varied by use of wye-start and delta-run phase connections for the motors. The operating conditions of the two motors can be varied to provide the necessary power while maximizing efficiency of the operation.

Abstract: A rotary discharge type centrifugal separator having a long service life, an energy saving effect, high performance and a high mechanical strength in which the length of a revolving cylindrical bowl is reduced; a high revolution is possible; sludge can be separated by a large centrifugal force; and a paste-like solid component can be efficiently discharged. The rotary discharge type centrifugal separator comprises a revolving cylindrical bowl having a separating zone and a scraping section a screw conveyor shaft coaxially and rotatably held in the bowl, and a pantograph link type scraper which is mounted on the screw conveyor shaft at a portion corresponding to the scraping section and which has four link bars pivotally connected to each other in a rhomboidal shape so that the link bars are supported symmetrically in a plane perpendicular to the axial center of the screw conveyor shaft.

Abstract: Rotary dryer having an enclosure surrounding a plurality of elongate blades positioned along an exterior portion of a fluid permeable sidewall. Rotation of the blades within the enclosure induces air to pass through the sidewall to improve drying characteristics of the dryer.

Abstract: A sedimentation centrifuge includes a bowl which is supplied with a feed mixture, i.e., a solid-liquid mixture, from a supply pipe. When the bowl rotates at high speed, heavy solids are displaced radially outwardly toward and sedimented on the inner wall surface of the bowl. The solid particles are then discharged through a discharge hole of the bowl and an outlet passage by a screw conveyor in the bowl. During rotation of the bowl, fins on the screw conveyor assist in separating the liquid into heavy and light liquid phases with increased separation efficiency. The separated heavy and light liquids are separately discharged from the bowl through respective outlet passages.

Abstract: A sedimentation centrifuge includes a bowl which is supplied with a feed mixture, i.e., a solid-liquid mixture, from a supply pipe. When the bowl rotates at high speed, heavy solids are displaced radially outwardly toward and sedimented on the inner wall surface of the bowl. The solid particles are then discharged through a discharge hole of the bowl and an outlet passage by a screw conveyor in the bowl. During rotation of the bowl, fins on the screw conveyor assist in separating the liquid into heavy and light liquid phases with increased separation efficiency. The screw conveyor has screw flights with an inner portion which is inclined with respect to the axis of rotation of the bowl and an outer portion which is normal to an inner wall surface of the bowl. The separated heavy and light liquids are separately discharged from the bowl through respective outlet passages.

Abstract: A decanter centrifuge enables separation of solid and liquid components from a feed solution containing suspended solids by application of centrifugal force. The decanter centrifuge has at least one disc-like dip weir fixed to the outside surface of a cylindrical portion of a screw conveyor on a solid component discharge port side located away from a feed solution supply port. A predetermined distance is provided between the outermost periphery of the dip weir and the adjacent internal surface of a coaxially rotating outer shell or bowl. An overflow hole is formed adjacent the internal periphery of the disc-like dip weir to pass liquid and the outermost edge of the overflow hole is located closer to the rotational axis of the screw conveyor than the outermost edge of a liquid component discharge port.

Abstract: An apparatus for separating solids and liquid mixtures such as to form concentrated sludge including a solid bowl worm centrifuge which has a slurry admission inlet and outlets for a liquid fraction and for concentrated sludge. A detector for detecting the consistency of the sludge leaving the centrifuge, a conduit for bypassing slurry being supplied from a source to the centrifuge and a control valve for controlling the amount bypassed as a function of the consistency of the sludge fraction and in some instances also a conduit for feeding a dilution liquid to the sludge leaving the centrifuge.

Abstract: The invention relates to a process and a centrifuge for removing solids located on a cylindrical casing wall (3) of a rotating centrifuge, in particular solids precipitated in the centrifuge from a liquid-solid mixture, to a solids exit opening (6) by sweeping the entire casing inner wall (9) in the direction of the solids exit opening (6). In order to reduce clogging, it is proposed according to the invention that in each case the casing inner wall (9) is swept in strips up to the solids exit opening (6), during one sweep up to the solids exit opening (6) only a part of the casing inner wall (9) is swept, and after a certain time the entire casing inner wall (9) is swept by strips (11) swept sequentially in time.

Abstract: A decanter centrifuge having an inflatable dam for controlling the pond level. Inflation of an annular bladder adjacent to the liquid discharge opening controls the radial height of the pond surface within the bowl of the centrifuge.

Abstract: A centrifugal separator for the separation a slurry into a light phase fraction and a heavy phase fraction including a rotatable shell having a cylindrical portion and a conical portion with a rotatable auger therein and a light phase opening at one end and a heavy phase opening at a second end sized to throttle the flow of light phase liquid and heavy phase liquid and sized in the cross-sectional area ratio of A/B so that the discharge from the separator will continue to be in the ratio of A/B regardless of throughput and in one form the separator has a second heavy phase opening in the cylindrical portion and in another form, an annular barrier vane on the auger blocking flow of liquid fraction toward the heavy fraction opening.

Abstract: A method for operating and improving the throughput and efficiency of a worm centrifuge by introducing, at a controlled frequency, successive pressure surges into the concentrated sludge fraction within the bowl separator preceding the solids discharge opening whereby the pulse frequency and the level of pressure are controllable and can be controlled as a function of the sludge fraction throughput through the separator.

Abstract: A method and apparatus for the separation of a slurry into a light fraction and a heavier fraction with a rotatable drum separator having a rotatable worm therein driven independently of the drum with an inlet for the slurry into the drum, an outlet for a liquid fraction, and outlet openings adjacent one end of the drum such as in the conical portion for the removal of the heavier abrasive sludge fraction with the openings extending at an angle opposite the direction of rotation of the drum and having wear-resistant inserts in the opening attached to webs beside the openings and removable by being pivoted out through the openings.