Abstract: In connection with reduction of the pressure of newly produced oil, i.e. a mixture of hydrocarbon compounds, this conventionally is performed stepwise, a momentary pressure drop occurring at each stage.According to the invention it is suggested that oil is caused to flow radially inward in a chamber (12), which is formed by a rotating vessel (1) and which is only partly filled with rotating oil, whereby the pressure drop in the oil can occur relatively slowly. A free liquid surface is maintained in the chamber (12), and a certain gas pressure is maintained in the liquid free part thereof, while evaporated hydrocarbon compounds are removed through a central gas outlet (18).

Abstract: A centrifugal separator which enables extraction of particles as concentrated liquid of a uniform concentration under a low pressure without damaging to the particles and is particularly suitable for extraction of weak cells such as animal cells. The centrifugal separator includes a plurality of particle collecting chambers (104: 104a) partially defined by an inner wall face (121) of a rotor (103) the diameter of which increases substantially continuously and suddenly comparing with the diameter of another adjacent portion for the inner wall face of the rotor. Particles centrifugally separated from liquid in a separating chamber (109) in the rotor are introduced into the particle collecting chambers in which they are accelerated suddenly to form soil suspension having an increased fluidity. The soil suspension is then introduced into horizontally extending deriving pipes (105: 105a: 105b: 105c: 105d: 105e) of a small sectional area and then extracted to the outside by way of an extracting pipe (118).

Abstract: A continuously operating centrifuge drum for concentrating suspended solids. The solids that precipitate in a stack of disks accumulate in a solids space and are diverted into a receiving chamber through mouthpieces. The mouthpieces contain throttle bores and communicate with the periphery of the solids space. To improve the known centrifuge drum to the extent that an optimal solids concentration can be obtained at low expense with no detriment to the clarified phase, there are secondary mouthpieces that also contain throttle bores, that communicate with a radially inner zone of the solids space, and that another receiving chamber is associated with. Since the volume of solids that can be diverted through the primary mouthpieces is less than the volume of solids separated in the drum, the solids flow out of the primary mouthpieces at the maximum attainable concentration, whereas the excess solids flow out through the secondary mouthpieces.

Abstract: To separate minerals, they are made up into a slurry A applied to a hollow tapered cylinder 301 spinning on its axis to generate 10 g centrifugal force.The cylinder 301 is also subjected to axial vibration at 5 to 10 Hz. The cylinder widens at a half-angle of 1.degree., and its axis is inclined at 2.degree. upwardly in the direction of widening.A film of slurry is held centrifugally to the internal surface of the cylinder and kept in suspension by the vibration. The denser (i.e. higher specific gravity) particles in the slurry tend to move preferentially radially outwardly (centrifugally) and to move downwardly in the boundary layer (under Earth's gravity). The action of the washing water B is to displace waste accidentally entrained with the higher-specific-gravity-particles.The valuable higher-specific-gravity particles overflow downwardly continuously at C and are collected.

Abstract: The intake space of a centrifuge drum is divided into a vestibule with ribs and an intake chamber without ribs. The vestibule communicates with the intake chamber through an annular gap between the outside diameter of a disk secured to an intake pipe and the inside diameter of the intake space. The intake chamber communicates with a set of disks through channels. The diameter D.sub.K of the intake chamber at the level of the channels is longer than the diameter D.sub.F that must be maintained at the upper surface of the centrifugate in a skimming chamber during operation. Since the incoming centrifugate does not rotate in the intake chamber and since no rotational pressure is accordingly generated, the intake pressure in the intake pipe is transmitted when the intake chamber is full to the centrifugate in the intake chamber, until the requisite level of centrifugate in the skimming chamber is attained.

Abstract: The invention provides a method of separating a mixed component waste stream in a centrifugal separator. The mixed component waste stream is introduced into the separator and is centrifugally separated within a spinning rotor. A dual vortex separation occurs due to the phase density differences, with the phases exiting the rotor distinct from one another. In a preferred embodiment, aqueous solutions of organics can be separated with up to 100% efficiency. The relatively more dense water phase is centrifugally separated through a radially outer aperture in the separator, while the relatively less dense organic phase is separated through a radially inner aperture.

Abstract: The invention concerns a centrifugal separator with a rotor (15), in which a flexible member (28), e.g. a hose, extends a distance along the periphery of the rotor. The hose defines two parallel channels (29, 30), which form a separation chamber in the rotor and extend from the peripheral part of the rotor towards the rotor center; from there axially out of the rotor (15) at one axially directed side thereof, around the rotor to its opposite side and to a point (27) aligned with the rotor axis (C). During the operation of the rotor the hose may be rotated intermittently around its longitudinal axis relative to the rotor body, so that the radially inner and outer walls of the separation chamber are changing places.

Abstract: A centrifuge apparatus having an adjustable weir surface for adjusting the depth of an annular pool of a light and heavy phase material mixture therein. A first annular plate is positioned over a discharge outlet and includes a plurality of notches, each defining a generally arcuate opening and in the periphery thereof. A second annular plate is positioned in coaxial parallel juxtaposition with said first annular plate and also includes an identical amount of notches, each defining a generally arcuate opening. The annular plates are angularly positioned with respect to each other such that the generally arcuate openings are placed in overlapping relationship. Therefore, depending upon the relative angular position of the annular plates with respect to each other, the weir length can be increased and decreased.

Abstract: A centrifuge drum for separating mixtures of liquids, especially for separating refrigerated milk into cream and skim milk, with an intake pipe secured to a stationary housing to supply refrigerated milk to a separation space in the centrifuge drum and a pealing disk for diverting the separated skim milk. The pealing disk is positioned in a pealing chamber that communicates through channels with the periphery of the separation space. A diversion chamber is disposed between the separation space and the pealing chamber that communicates with the center of the separation space and has a diversion channel for diverting the cream into a stationary interception chamber. The pealing chamber is positioned axially between the diversion chamber and the interception chamber and the diversion channel is positioned concentric with the axis of rotation of the drum, whereby the diversion channel extends radially outward from the diversion chamber, through the center of the pealing disk, and into the interception chamber.

Abstract: A liquid separator has a centrifuge rotor (1) with a set of conical separation discs (21) arranged coaxially in the separation chamber (13). The inlet of the separation chamber is formed as inlet passages (20) which extend radially outwards from a central inlet chamber (16) in the rotor, along that end wall of the separation chamber, towards which the apex ends of the separation discs face. The inlet passages (20) are formed between that end wall and a partition member (18, 19) situated between the rotor end wall and the separation discs (21). The outlet of the separation chamber (13) for separated liquid is formed by a number of channels (22) through the partition member (18, 19) and aligned channels through tubular members (23) bridging said inlet passages (20).

Abstract: An improved centrifugal type gas-liquid separator is composed of a rotatable hollow disc-shaped gas-liquid separation chamber having a separated liquid outlet on its outer circumferential surface, a housing surrounding the gas-liquid separation chamber liquid-tightly outside thereof so as not to restrain its rotation and liquid-tightly defining a reservoir chamber of separated liquid between the inner circumference of its outer portion and the outer circumference of the gas-liquid separation chamber. A separated liquid extraction port enables the separated liquid to be extracted continuously from the reservoir chamber of the housing. Tubular rotary shafts are inserted in the proximity of the rotary center axis of the gas-liquid separation chamber along the rotary center axis from the opposite sides of the housing. Gas-liquid mixture fluid is fed into the gas-liquid separation chamber through one of the tubular rotary shafts, and the separated gas is ejected through the other tubular rotary shaft.

Abstract: A centrifuge apparatus and a method of filtration are described. The centrifuge has radial and lateral filtration surfaces and separate discharge chambers for each. The lateral filter is located at an imperforate radial distance from the radial filter. This distance forces the filtration to occur through the radial filter and develop the filter cake rather than pass through the lateral filter which has no developed cake. The use of separate, laterally-disposed withdrawal chambers at different radial heights allows accurate control over the hydraulic filtration forces acting across the filter surfaces.

Abstract: A centrifuge for separating mixtures of liquids. The drum has an upper diversion chamber and a lower diversion chamber that divert the fractionated constituent of the liquid out of the drum and that are separated by a replaceable lid. At least one of the diversion chambers has a peeling structure that is provided with channels and an intake pipe that supplies the mixture of liquids. The drum can be equipped with another chamber lid and with another peeling structure with channels and an intake pipe. The channels in the second peeling structure open into the intake pipe and the second chamber lid unites the two diversion chambers into a single chamber.

Abstract: This invention is drawn to a high-speed centrifugal extractor having improved weirs for selectively separating a heavy liquid and a light liquid. Each of the selection weirs has a double tube structure consisting of an outer cylinder extending from a rotor peripheral wall towards a rotor rotary shaft and an inner cylinder which is inserted into the outer cylinder through the rotor peripheral wall in such a manner that the insertion length of the inner cylinder can be varied. The heavy liquid selection weir has a heavy liquid withdraw port at the wall of the outer cylinder positioned inside the heavy liquid phase, while the light liquid selection weir has a light liquid withdraw port at the wall of the outer cylinder positioned inside the light liquid phase. By varying the insertion length of the inner cylinder into the outer cylinder, the position of an interface at which the heavy and light liquid phases are separated inside a rotor can be changed.

Abstract: A centrifuge device for separating different species of particles having different masses or sizes which are contained in a fluid medium, wherein the device comprises a plurality of adjacent channels positioned in a centrifugal field. The fluid medium flows through such channels and the channels are arranged such that portions of the fluid medium are successively diverted from one channel to the next in a cascaded manner. Accordingly, for separating particles of two different species, for example, portions of the fluid containing particles of one species and a fraction of the particles of the other species are so diverted in each case from one channel to the next adjacent one, while the remaining portions containing only particles of the other species continue to flow in the one channel.

Abstract: A scraper for a sugar centrifuge comprises a scraper blade mounted on an arm which is moved down into and pivoted within the centrifugal bowl, such that the edge of the scraper blade is moved against but out of contact with the bowl wall for scraping off the sugar adhering to the bowl wall. After the scraping edge, the scraper blade has an afterscraper in direct or indirect contact with the bowl wall. The afterscraper comprises in one embodiment a block whose boundary plane facing the scraping edge forms an acute angle with the tangential plane along the line of contact of the block with the bowl wall.

Abstract: To separate minerals, they are made up into a slurry A applied to a hollow tapered cylinder 301 spinning on its axis to generate 10 g centrifugal force. The cylinder 301 is also subjected to axial vibration at 5 to 10 Hz. The cylinder widens at a half-angle of 1.degree., and its axis is inclined at 2.degree. upwardly in the direction of widening. A film of slurry is held centrifugally to the internal surface of the cylinder and kept in suspension by the vibration. The denser (i.e. higher specific gravity) particles in the slurry tend to move preferentially radially outwardly (centrifugally) and to move downwardly in the boundary layer (under Earth's gravity). The action of the washing water B is to displace waste accidentally entrained with the higher-specific-gravity-particles. The valuable higher-specific-gravity particles overflow downwardly continuously at C and are collected.

Abstract: The present invention provides an improved rotor for a centrifuge that operates by centrifugal elutriation. The rotor consists of a chamber assembly, a disk assembly, and a quick release mechanism. The chamber assembly is relatively light and it includes one or two separation chambers, tubing and a rotating seal. The disk assembly consists of the relatively heavy support structure. The two piece construction facilitates handling the parts of the rotor that generally need to be autoclaved. The chamber assembly has a novel structure that allows the rotor to easily be configured for operation with one or two chambers. The disk assembly has a unique strain relief that prevents structural cracking. The quick release mechanism is held in the latched position by centrifugal force during operation of the rotor.

Abstract: A decanter centrifuge which includes an annular bowl, a hollow tube on the axis of the bowl, and means for discharging from the bowl a first phase of an input sludge, the centrifuge being characterized by a fluid-activated airlift device which includes a discharge line radially supported from the hollow tube, and a fluid supply line for conveying fluid from within the hollow tube to an outer end portion of the discharge line to effect removal from the bowl through said line of another phase of the sludge.

Abstract: A centrifuge drum is provided with a seal consisting of a narrow gap between the drum and centrifuge housing. The seal is located between the actual housing and the solids catch chamber. There is a pressure-compensation space at the drum in the vicinity of the seal. The exchange of air that occurs at the seal in a centrifuge without the compensation space between the solids catch chamber and the housing in accordance with the invention and that leads to deposits of solids in the housing is accordingly displaced into the compensation space.

Abstract: A solid bowl centrifuge for dewatering sludge exhibiting a conical solid bowl and an inner rotor part which revolving at different speeds and has apparatus for axially transporting solid components for improved separating and reduced energy consumption. The sludge is introduced at a tapered end and solid components are discharge at an expanded end. Introduction of sludge is effected through a radial inlet channel(s). Surface elements are attached to the inner rotor by holder arms and are located at a slight distance from the inner wall of the solid bowl drum. A surface element free axial passage channel is defined between the inner rotor wall and the solid bowl drum extending at least 50% of the radial distance between the rotor wall and the drum. A baffle plate is mounted on the inner rotor at the wide end of the drum leaving an annular gap or passage between a compacting space and a sediment discharge which exhibits a radially inwardly directed sediment outlet channel(s).

Abstract: In a centrifugal separator a flexible member for the transport of liquid to or from a centrifuge rotor is arranged to rotate around a rotating rotor in the same direction as the rotor but with only half of its rotational speed. By such rotation the flexible member may be firmly connected with both the rotor and a stationary member without being twisted. According to the invention the flexible member has a high torsional stiffness, good tensile strength and an outside having good wear resistance. The casing comprises interplaited threads which may be metal or plastic, some of which extend helically with a certain pitch around the flexible member and others of which extend helically with an opposite pitch around the member. The interplaiting of the threads is such that the casing per se is axially compressible and expandable under radial expansion and compression, respectively. As mounted, the casing is axially expanded so that through radial compression it is in frictional engagement with the flexible member.

Abstract: Decanter pond level or radius is adjusted incrementally by means of an annular retainer plate having an eccentric recess formed in the surface thereof which faces hub openings. The recess receives a plate dam slidably therewithin. Each retainer plate or retainer, typically 6 in number, is mounted over a hub opening. The dam is mounted over the hub opening such that its weir surface substantially coincides with the rotating pond level. By rotating the retainer around the prepositioned dam in increments preset in the retainer, the dam moves radially inwardly or outwardly depending upon the position of the recess eccentricity with respect to the hub opening. The dam is provided with two different weir surfaces, each usable with a different side of the dam, thus permitting the number of adjustments to the pond level to be doubled. A modification discloses infinite or stepless pond level adjustments.

Abstract: The invention resides in the provision of a sludge recirculation controlled in this manner within the centrifuge rotor itself. For this reason there has been arranged centrally in the rotor, apart from a previously known reception chamber (10) for separated sludge, a recirculation chamber (14) to which sludge is transferred from the reception chamber (10). An overflow outlet (15) maintains a free liquid surface in the recirculation chamber (14) at a predetermined radial level. Recirculation channels (16), which are formed so that the flow therethrough will automatically be controlled depending upon the viscosity of the separated sludge, will conduct such sludge from the recirculation chamber (14) back to the radially outermost parts of the separation chamber (5).

Abstract: In a centrifugal separator for instance for purifying oil from water and solids there is a central outlet for separated water, comprising an overflow outlet maintaining a free water surface at a certain level in the door. According to the present invention this central outlet may be closed by means of an axially movable slide (23), which is rotatable together with the rotor. The rotor also has a further overflow outlet (22a) situated radially inside said predetermined level (20) such that upon supply of a so called displacement liquid to the rotor--in connection with the opening of periphery outlets (21) from the separation chamber for discharge of separated solids--separated water cannot leave the rotor through its outlet (12, 15) for separated oil.

Abstract: A drum for clarifying and separating centrifugates. It has at least one skimmer for diverting the clarified or separated centrifugates, a stationary inlet pipe extending into an inlet chamber, which rotates along with the drum, through an aperture that is slightly wider than the inlet pipe, outlets extending from the inlet chamber into a vestibule that communicates with channels ascending through a set of nested plates within the drum, and, upstream of the inlet chamber, an annular space that communicates with the inlet chamber through an annular channel.

Abstract: The atomizer wheel is provided along the circumference of its external wall (3) with a number of ejection apertures, in which wear-resistant ceramic linings (7) are arranged by means of replaceable steel bushings (8). The steel bushings (8) and/or the linings (7) project somewhat into the annular chamber of the atomizer wheel and the bushings are sealed against the external wall (3) with sealing rings (11). Moreover, each bushing (8) is provided in its inner surface facing the associate lining (7) with a flat recess (13) extending on either side of the inner surface of the external wall (3). Thereby, the steel bushings (8) may be resiliently deformed without transferring excessive stresses to the linings (7).

Abstract: In a centrifugal separator an outlet member (9) is rotatably arranged within the centrifuge rotor (1, 2) such that it can be entrained in rotation by liquid having been supplied to the rotor. The outlet member (9) forms a groove (13) which is open towards the rotor axis and in which there opens an outlet channel (11) starting in the part of the rotor which contains, during operation of the rotor, a separated liquid component. A non-rotatable outlet member (7) has at least one outlet passage (8), one end of which opens in said groove (13) at a level where separated liquid component will be present during operation of the rotor only when the rotatable outlet member (9) is caused to rotate with a certain lower speed than the liquid within the rotor.

Abstract: In a centrifugal separator, an outlet member (9) is rotatable in the centrifuge rotor (1, 2) in a way such that it may be entrained in rotation by liquid supplied to the rotor. The outlet member (9) has an outlet channel (11) leading from one place within the rotor, where a separated mixture component is present, to a reception place (13) for the mixture component. A first means (19) is arranged to counteract rotation of the outlet member (9) so that a desired relative movement is obtained between the outlet member (9) and the separated mixture component in the rotor which is to be removed. A second means (27-30) senses the magnitude of the force by which the outlet member (9) is counteracting the braking effect of said first means. The first means (19) is connected with the second means (27-30) and arranged to accomplish a desired relative movement between the outlet member (9) and the separated component in the rotor in response to the magnitude of said sensed force.

Abstract: A control valve for a self-emptying centrifuge drum for draining closure fluid out of a closure chamber positioned below an axially movable piston slide with a valve piston that closes the closure-fluid runoff bores by means of centrifugal force and opens them by supplying control fluid to an initial control chamber that has an inlet and an outlet. To improve the known control valve to the extent that it will close more rapidly, making the amount of solids extracted at each emptying more constant, another control chamber, also having an inlet and an outlet, but in which the active face of the piston is larger than that of the piston in the initial control chamber, is provided, with the volumes of the control chambers and the cross-sections of the inlets and outlet ensuring that the initial control chamber is filled first and the second control chamber only after a delay.

Abstract: At a centrifugal separator the centrifuge rotor has an inlet (24) to a separating chamber (4) for a fluid mixture of components to be separated, and means for removing of one separated component from another during the operation of the rotor. Said means comprise an outlet member (15) which is arranged to be entrained in rotation by fluid having been supplied to the rotor but which--at least intermittently--may be caused to rotate at a lower speed than said fluid. A channel (16) extends through the outlet member (15) from a point in the rotor, where the separated component is situated, to a reception place therefor. The reception place may be arranged either within or outside the rotor.

Abstract: A method and an apparatus for pneumatically evacuating a vertical centrifuge (12), the drying gas moving as a secondary flow (54) being converted--prior to its combination with the mixture of product and gas conveyed through the discharge pipe--into a turbulent longitudinal flow essentially enclosing the discharge pipe as far as its downstream end, in order to prevent caking of the centrifuged material within the discharge pipe or in conveying lines (20) attached thereto and also to shorten the length of the drying pipe.

Abstract: An apparatus for partial dehydration of a sludge in the centrifugal field of a centrifuge wherein the residual moisture of the sludge is substantially reduced with a comparatively low compression of the sludge, and the non-effective cone length of the centrifuge is reduced without shortening the sludge dwell time. The invention includes an arrangement of agitator elements within the centrifugal drum, coupled with a following shearing centrifuge and decanter, the shearing centrifuge being connected at the discharge of the centrifugal drum.

Abstract: A centrifuge for separation of two liquid phases of different specific gravities to be removed separately; the separation chamber has a first subset of openings communicating with a skimmer and a second subset of openings communication with a collector. In one position, a movable barrier plate covers the inner portion of the first subset and the outer portion of the second subset to direct the heavier liquid to the skimmer and the lighter liquid to the collector. Changing the barrier to a second position where the situation is reversed selectively directs the lighter liquid to the skimmer.

Abstract: Dam members are provided with an upper discharge weir surface permitting flow of separated liquid thereover during normal or stable centrifuge operations, and a notch or the like interrupting said weir surface or disposed immediately therebelow to provide a lower discharge weir surface permitting flow of separated liquid therethrough to insure an absence of liquid being discharged at solid discharge ports during start-up.

Abstract: An improved screw decanter type centrifugal concentrating machine for the type including a bowl and a screw conveyor rotatably supported within the bowl in the coaxial relation is disclosed. The screw conveyor is rotated at a different rotational speed from that of the bowl and an arrangement is made such that liquid initially supplied prior to separating, concentrated liquid and residual liquid after completion of separation are continuously supplied and discharged through the hollow space in the hollow shafts of the bowl and the screw conveyor. To properly adjust discharge rate of concentrated liquid and residual liquid from the machine or concentration of solid material in both liquids, throttle valves are disposed at the position located midway of discharge passages extending from the hollow shafts. The throttle valves are preferably designed in the form of an automatically controlled valve. Suspension to be treated is introduced into the bowl by way of guide vanes on the side wall of the bowl.

Abstract: A centrifuge for separating first and second liquids having different specific gravities includes a container supported for rotation about an axis, a drive arrangement for rotating the container, a supply arrangement for introducing a mixture of the liquids into the container, a valve arrangement supported on the container and in fluid communication with and responsive to fluid pressure in a radially outermost portion of the container for discharging quantities of the first liquid from such portion of the container to the region external to the container during rotation of the container, and an arrangement for removing from the container during rotation thereof quantities of the second liquid.

Abstract: An apparatus and method for removing air and other gases entrained in water or other liquid and, more particularly from water delivered from a steam condenser and used in a steam-generating system for powering a prime mover of a torpedo. The apparatus includes a rotatable drum for centrifuging a volume of water and air to separate the water from the air, a pitot probe for drawing water from the container under pressure, a water-driven air jet pump within the rotatable drum and communicating with the separated air to pump the air into a collection chamber and build up the pressure thereof, a nozzle for directing a portion of the water drawn through the pitot probe to the air jet pump for operation thereof and a relief valve for controlling the discharge of air under pressure from the collection chamber to an exhaust area which may be a pressurized area within the torpedo.

Abstract: A fully jacketed centrifuge with a helical conveyor for separating mixtures of solids and liquid has apertures below the surface of the liquid in the jacket of the drum. Some of the centrifuges solids are let off through the apertures. Inside the helical conveyor is, in addition to one inlet space for the mixture of solids and liquids, another inlet space that has an access and that communicates with channels that extend in the vicinity of the apertures into the vicinity of the jacket. The apertures are positioned in interchangeable mouthpieces. The concentration of solids flowing off out of the apertures is controlled by constantly returning part of the solids that emerge from the flowoff through the access, the second inlet space, and the channels into the vicinity of the apertures.

Abstract: An apparatus for dissolving a powder in a liquid solvent, wherein it comprises a vertically axes rotary bowl, means for introducing the powder and the liquid solvent into the bowl, and a fixed cylindrical member arranged coaxially within the bowl and having on its outer face at least one first helicoidal ramp oriented with respect to the bowl rotation direction in such a way that it ensures the raising of the solution up to means ensuring the removal thereof from the bowl.

Abstract: A continuous flow device for separation of particles of differing densities in a centrifugal force field. Very small particles of differing densities that are normally very difficult or impossible to separate in the useful commercial gravity separation devices can be separated because of the increased settling force due to the centrifugal force field and also the buoyant force on the particles of lesser density caused by a thickened slurry layer. A thin film of a slurry of solid particles of differing size and density travels over a revolving surface of such configuration that the slurry flows in a substantially laminar manner. As the thin film of slurry flows along the surface, the particles of greater density tend to concentrate in the region next to the surface. While the particles of lesser density remain in or are forced into the fraction of the film closest to the axis of revolution.

Abstract: The present invention is with respect to a bell-like centrifuge drum for freeing metal turnings of oil continuously and which is made up of a lower drum part (1) with a floor (2) and a coned wall part (3), at whose top edge an outwardly running flange (4) is placed and an upper drum part (5) at whose lower edge there is again an outwardly running flange (6), which, producing a gap (10) for letting off liquid to be cleared from the turnings, is fixed on the flange (4) of the lower drum part (1).

Abstract: Centrifuge and in particular a tubular conifuge for the purification of liquids and for the concentration of sludge, the centrifuge consists of two drum halves and one axially displaceable tube or shell connecting the drum halves, with axial introduction of the material to be treated. At least part of one of the drum halves is axially displaceable during the run of the centrifuge for the purpose of reducing the inner drum space.

Abstract: The drum of a centrifugal filter is cleaned by stopping the rotation of blades which normally rotate with the drum, while allowing the drum to continue to rotate, and retracting the bottom of the drum to open an annular aperture through which accumulated contaminants dislodged by the blades discharge.

Abstract: A self-discharging centrifugal drum for clarifying and separating suspensions, has an axially displaceable piston valve that is bounded above by a solids space and that opens and closes expulsion openings in the drum jacket. A closure compartment that can be charged with closure fluid and that can be evacuated through a centrifugal valve in the drum jacket is disposed below the piston valve. A second fluid-controlled centrifugal valve in the drum jacket is connected through connecting channels to the closure compartment and through a connecting channel with a reservoir in the drum jacket that is always charged with closure fluid and subjected to fluid pressure when the drum is in operation. When the closure compartment is evacuated, a valve cone in the second centrifugal valve opens to establish a connection between the closure compartment and the reservoir. This permits not only sudden evacuation but also just as sudden charging of the closure compartment with closure fluid.

Abstract: In a stationary skimmer disc for withdrawing a liquid phase from a centrifuge there are formed one or more liquid discharge ducts each having an inlet at the outer periphery of the disc and at least one outlet located closer to the center of the disc. From a region of the flow path of the discharged liquid, where the static liquid pressure, during operation of the centrifuge, exceeds the static pressure at the inlet to the discharge duct or ducts, a by-pass duct having a throttling means intermediate its ends leads back to each of said inlets.

Abstract: A centrifuge apparatus (10) for separating multi-phase fluid is disclosed. The centrifuge apparatus (10) includes a bowl-like structure (12) rotatably mounted in a housing (14) for rotation about a vertical axis. The centrifuge apparatus (10) further includes means for introducing multi-phase fluid into the bowl (12) and means for driving the bowl (12) at a predetermined rotation speed. A rotor assembly is coaxially mounted in the bowl (12) for rotation therewith to accelerate or impel the multi-phase fluid such that the fluid is separated into heavier phase fluid and lighter phase fluid with solid particles being collected on the inner surface of a bowl side wall portion (16).A top wall member (18) of the bowl (12) defines axially directed openings (50) therein for discharging the heavier phase fluid. Discharge means positioned in the cylindrical side wall portion (16) extend radially into the interior of the bowl (12) for discharging the lighter phase fluid.

Abstract: A continuous feed, solid bowl centrifuge with intermittent rim discharge. The centrifuge has first and second members mounted in fixed positions relative to each other for rotation about a common axis. Each member has a peripheral edge portion extending about the common rotational axis with the portions being spaced from each other to create an annular gap therebetween. A third or rim member is mounted for rotation with the first and second members about the common rotational axis. The rim member has a cylindrical surface extending between the peripheral edge portions of the first and second members and is dimensioned to close the gap therebetween. The rim member is supported with its cylindrical surface substantially parallel to the rotational axis of the centrifuge; and, an opening-closing mechanism is provided that maintains the cylindrical surface substantially parallel to the rotational axis as it is moved to open and close the gap.

Abstract: A centrifuge apparatus having an external movable member to close the outer end of a fixed width peripheral discharge opening which may be partially deformable to effect such closing.

Abstract: Discharge nozzles are provided in centrifugal separator drums for the continuous discharge of the concentrate separated in the drum, and are inserted into the drum wall from the outside for the sake of ease of installation and cleaning. To enable the discharge orifice to aim itself correctly tangential to the drum circumference during operation and against the direction of rotation of the drum, there is provided opposite a locking projection on the discharge nozzle, an additional, excentrically disposed projection. The center of gravity of the rotatable discharge nozzle lies in this projection, so that, under the action of centrifugal force when the drum is rotating, the center of gravity of the discharge nozzle will set itself, even if incorrectly aligned at installation, on an axis that is radial to the drum axis. The discharge orifice is aimed opposite to the direction of drum rotation at an angle of 90.degree. to the gravity axis.