EP1468744A1 - Centrifugeuse à poussoir avec cone rotatif pour pre-accélerer le mélange - Google Patents

Centrifugeuse à poussoir avec cone rotatif pour pre-accélerer le mélange Download PDF

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Publication number
EP1468744A1
EP1468744A1 EP04405167A EP04405167A EP1468744A1 EP 1468744 A1 EP1468744 A1 EP 1468744A1 EP 04405167 A EP04405167 A EP 04405167A EP 04405167 A EP04405167 A EP 04405167A EP 1468744 A1 EP1468744 A1 EP 1468744A1
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EP
European Patent Office
Prior art keywords
mixture
acceleration
funnel
drum
stage
Prior art date
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Granted
Application number
EP04405167A
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German (de)
English (en)
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EP1468744B1 (fr
Inventor
Harald Dr. Reinach
Roy Geiger
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Ferrum AG
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Ferrum AG
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Priority to EP04405167A priority Critical patent/EP1468744B1/fr
Publication of EP1468744A1 publication Critical patent/EP1468744A1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B11/00—Feeding, charging, or discharging bowls
    • B04B11/06—Arrangement of distributors or collectors in centrifuges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B3/00—Centrifuges with rotary bowls in which solid particles or bodies become separated by centrifugal force and simultaneous sifting or filtering
    • B04B3/02—Centrifuges with rotary bowls in which solid particles or bodies become separated by centrifugal force and simultaneous sifting or filtering discharging solid particles from the bowl by means coaxial with the bowl axis and moving to and fro, i.e. push-type centrifuges

Definitions

  • the invention relates to a pusher centrifuge according to the preamble of independent claim 1.
  • Centrifuges for drying moist substances or moist substance mixtures Centrifuges in a variety of embodiments are widely used and become used in various fields. So come for example to Drying of high purity pharmaceutical discontinuous products Centrifuges, such as peeler centrifuges, are preferred for use, in particular then, when continuously separating large quantities of a solid-liquid mixture to be used, continuously operating pusher centrifuges advantageous become. Depending on the requirement, one or more stages are involved Pusher centrifuges, as well as so-called double-thrust centrifuges used.
  • a solid-liquid mixture for example a suspension or a moist salt or salt mixture
  • a mixture distributor one quickly rotating drum, which is designed as a filter, fed, so that on reason the centrifugal forces exerted the liquid phase through the filter screen is deposited while inside the drum wall, a solid cake becomes.
  • the rotating drum in the rotating drum is a substantially disc-shaped, arranged synchronously with rotating moving floor, depending on the number of Sieve either the sliding floor or a sieve in the axial direction in the Drum oscillates with a certain amplitude, leaving part of the dried Solid cake is pushed out at one end of the drum.
  • the known from the prior art pusher centrifuges are usually continuously operating filter centrifuges.
  • There are one-stage and multi-stage Pusher centrifuges known the multi-stage pusher centrifuge from a outer screen drum and at least one in the outer screen drum arranged screening stage, which is also designed as a screen drum consists.
  • a plurality of screening stages can be arranged concentrically in one another, so that two, three and multi-stage pusher centrifuges are feasible, with all screening stages be driven very quickly synchronously about a common axis of rotation.
  • a two-stage pusher centrifuge performs the innermost stage, which is also the first Stage is called, in addition to the rotational movement about the axis of rotation a Oscillation movement in the direction of the axis of rotation.
  • This oscillatory Movement is hydraulic via a thrust piston with reversing mechanism generated.
  • the solid cake in ring sections according to the Stroke length of the oscillation, pushed from the first to the second stage and leaves Finally, the pusher centrifuge via an outlet opening.
  • the solid cake in the sieve drum continuously with the addition of Washing liquid washed on the solid cake.
  • a single-stage pusher centrifuge comprises except the outer screen drum no further screening steps.
  • a well-known two-stage pusher centrifuge after the previously described Principle operates, is described in detail for example in DT 25 42 916 A1, while a known method for operating a pusher centrifuge, in particular a single-stage pusher centrifuge, taken, inter alia, EP 0466751 B1 can be.
  • Stage i. the innermost screening stage, essentially for the pre-dewatering of the Mixture, as well as to form a solid cake
  • the outer Screen drum mainly serves as a drying stage.
  • Pusher centrifuges partly massive disadvantages. So that is through the inlet pipe in the mixture distributor introduced mixture when hitting the screen drum in accelerated to the full peripheral speed of the drum in no time. Especially with sensitive substances, this can lead to grain breakage lead, that is, for example, solid grains in one of the centrifuge fed suspension in the abrupt acceleration process in Uncontrolled way burst into smaller pieces, causing negative influences on the Quality of the produced solid cake may have, if for example the Particle size of the grains in the final product plays a role.
  • the object of the invention is therefore to provide an improved pusher centrifuge to propose that the disadvantages known from the prior art largely avoids.
  • the invention thus relates to a pusher centrifuge for separating a mixture in a solid cake and in a liquid phase.
  • the inventive Pusher centrifuge comprises an outer rotatable about a rotation axis Sieve drum, a arranged in the drum mixing mixture with a Push floor device and a feed device, wherein the Moving floor device is arranged and designed so that the solid cake is displaceable by means of the sliding floor device and with the feed device the mixture can be introduced via the mixture distributor into a void, the at Moving the solids cake by the push floor device is formed.
  • the Mixture distributor comprises at least one funnel for pre-acceleration of Mixture, wherein the funnel is arranged rotatably about a drive axis and by means of a drive with a predetermined speed is rotatable about the drive axis.
  • the pusher centrifuge according to the invention serves to separate a mixture into a mixture Solid cake and in a liquid phase and includes as essential components a rotatable about an axis of rotation about a drum axis outer screen drum, which is housed in a housing.
  • the inventive Pusher centrifuge as single-stage, two-stage or higher-level pusher centrifuge be designed.
  • the drum axis stands with a drum drive in itself known manner in operative connection, so that the outer screen drum through the Drum drive is set in fast rotation about the axis of rotation.
  • Within the outer screen drum is at higher levels, i. in two or more stages Pusher centrifuges arranged at least one further screening stage.
  • either the screening stage and / or the moving floor device along the Rotary axis is arranged to move back and forth, so that the solid cake by means of the sliding floor device is displaceable.
  • Both the outer sieve drum as also if, as with multistage pusher centrifuges, the further screening stage, have sieve openings through which in a known manner with rapid rotation Liquid phase from the solid cake or from the mixture, as further is described in more detail below, in single-stage pusher centrifuges on a inner peripheral surface of the screen drum, or on an inner Sieb threadn simulation the Sieve level in multi-stage pusher centrifuges, can be applied, by the occurring Centrifugal forces can be discharged to the outside.
  • the Screening drum and / or the screening stage in a conventional manner as a skeletal Support drum to be designed to form the corresponding screen surfaces with special filter sheets are lined at their periphery, i.
  • the skeletal Support drum can, for example, with one or more filter screens with different or equal sized filter openings for the deposition of Liquid phase be configured.
  • the mixture distributor Inside the sieve drum is the mixture distributor with the push floor device and the feeding device, which allows to be continuously through the Feed supplied mixture on the inner peripheral surface of the Screening drum or, in the case of multistage pusher centrifuges, to the screening surface area of the Sieve by introducing into the void, which is when moving the Solid cake arises, distribute.
  • a peripheral area while the push floor device is as Ring area formed that with the ring area in single-stage pusher centrifuges in the screening drum, and in multi-stage pusher centrifuges in the screening stage, deposited solid cake by a later described in more detail Oscillation of the push floor device and / or the screening stage, in single-stage Pusher centrifuges from the screening drum, or in multi-stage pusher centrifuges in the screening drum or in another possibly existing screening stage, displaceable is.
  • the Mixture either a funnel designed as a funnel for Pre-acceleration of the mixture, which is substantially expanding to Schubêtvorrides out, and / or one as Pre-acceleration funnel designed funnel for pre-acceleration of the Mixture that extends in the direction of the substantially Feed device extends, wherein the inlet funnel and / or the Pre-acceleration funnel about a drive axle with a predefinable speed is rotatable by means of a drive.
  • the inlet funnel and / or the Pre-acceleration funnel for controlled pre-acceleration of the introduced Mixture, regardless of the rotational speed of the outer screen drum rotatable about the drive axis at a predefinable speed.
  • the mixture unlike that of the prior art known pusher centrifuges, in the region of the inlet funnel and / or in the area of the pre-acceleration funnel is not abrupt, i. in the shortest possible time to the full Rotation speed of the outer screen drum is accelerated, are Example of grain breakage and other harmful effects on the mixture preventable.
  • the various embodiments of the Pusher centrifuge according to the invention in particular also mechanically very sensitive fabrics, even at extremely high rotational speeds of Sieve drum processable.
  • both the inlet funnel and the extend Pre-acceleration hopper preferably under a substantially constant Opening angle conically widening in the direction of the sliding floor device or to Infeed device out.
  • the inlet funnel and / or the Vorbevantung funnel in a predetermined range but also one have curved course, wherein the opening angle of the inlet funnel and / or the pre-acceleration angle of the pre-acceleration hopper in the direction enlarged or reduced to the sliding floor device. That can in particular be advantageous if the inlet funnel or the pre-acceleration funnel, as will be described in more detail later, as a prefilter screen or as Pre-acceleration screen is designed for the pre-separation of liquid phase.
  • the inlet funnel irrespective of the speed of the outer sieve drum, be driven by the drive to the drive axle, while the Moving floor device rotatable synchronously with the sieve drum about the axis of rotation can be arranged.
  • the mixture distributor for pre-acceleration of Mixture include a pre-acceleration funnel, which is preferred, but not necessary, rotatably connected to the sliding floor device, so that the Pre-acceleration funnel rotates synchronously with the sieve drum.
  • the pre-acceleration hopper in another embodiment also may be missing, or also, as the inlet funnel, on its own drive can dispose of.
  • the oscillatory movement for moving the solids cake completes this process for example, in a single-stage pusher centrifuge, the mixture manifold alone, while in a multi-stage pusher centrifuge a screening stage a corresponding can perform oscillatory motion.
  • it is in the operating state either an oscillatory relative movement between the moving floor device and in the axial direction immovable screen drum and / or between a or several possibly existing further screening stages and / or the between the push floor device and / or one or more possibly existing further screening stages.
  • the oscillatory movement of the moving floor device and / or the screening stage preferably takes place via a push rod, wherein in a first Half-period of the oscillatory motion with the outer ring area of the the sieve drum deposited solid cake in ring sections whose width the stroke length of the oscillation movement of the moving floor device and / or the Sieve is determined, is pushed out of the sieve drum.
  • a second Half-period of the oscillatory motion creates the void in the Sieve drum and / or in the screening stage, so that in the white space new mixture can be introduced.
  • the inlet is funnel than Pre-filter screen for pre-separation of liquid phase formed from the mixture.
  • liquid phase there are also mixtures with a very high content of liquid phase, for example more than 50% Liquid phase or more than 70% liquid phase or even more than 90% Liquid phase easily processable.
  • a high Content of liquid phase always a uniform distribution of the to be dried Mixture over the peripheral surface of the screening stage, or the screening drum guaranteed.
  • additional pre-drainage facilities such as static Thickeners, curved sieves or hydrocyclones superfluous.
  • the inlet funnel as a pre-filter for Pre-separation of liquid phase is formed, it may be of particular advantage be when the inlet funnel has a curved course and the Opening angle of the inlet funnel in the direction of the sliding floor device out enlarged or reduced. It is known that different products under otherwise identical operating conditions of the pusher centrifuge, for example in Dependence on the particle size and / or the viscosity and / or other Properties or parameters, such as the temperature of the mixture Different drainage are good.
  • the inlet funnel or the Prefilter filter has a curved course, wherein the opening angle of the Prefilter increased in the direction of the sliding floor device towards. That means, the Inlet funnel or the prefilter sieve expands towards the Moving floor device similar to the horn of a trumpet. This will be the Stripping force, with which the mixture is accelerated from the inlet funnel, with decreasing distance to the moving floor device disproportionately larger, so that the mixture, which is already relatively strongly drainable in the prefilter sieve and so that poor sliding properties in the prefilter shows faster, the prefilter sieve leave as, for example, in a substantially conical, with constant opening angle expanding prefilter screen.
  • Vorbeuggung funnel have a curved course, wherein the Pre-acceleration angle of the pre-acceleration funnel in the direction of Infeed device enlarged or reduced.
  • the derivation of the liquid phase from the collecting means may include done in different ways.
  • a multi-stage pusher centrifuge is the Pre-filter screen by means of one or more mounting supports on a screening stage arranged, wherein the mixture distributor comprises a pre-acceleration funnel, which is arranged rotatably about a rotation axis and by means of a rotary drive can be driven independently of the rotational speed of the outer screen drum is.
  • the mounting posts are preferably in the form of suitably shaped Spokes, thin rods and / or pipes are formed, so that in Operating state of the solid cake easily from the screening stage or from the Sieve drum is removable.
  • At least one of Mounting posts so formed and on an outer edge of a screening stage be arranged that collected in the collecting liquid phase through the Fixing support in a sieve opening of the screening stage is conveyed and through the Sieve opening is separable from the screening stage.
  • the mounting bracket itself at a suitable location openings for the discharge of Be provided liquid phase or at the screening stage at a suitable location be provided additional openings for discharging the liquid phase.
  • the prefilter by means of one or more Fixing supports is arranged instead of at a screening stage on the screening drum.
  • This can be particularly advantageous in single-stage pusher centrifuges of Be a case.
  • the prefilter sieve can be replaced by one or more Fastening supports also at the same time at two or more screening stages and / or be arranged the screen drum, wherein the corresponding screening stages or the Screen drum perform no oscillatory relative movement against each other.
  • the prefilter sieve may also be referred to as Zweicarensieb be designed with a coarse filter and a fine screen.
  • the first Filter stage forms the coarse filter, which contained in the mixture particles, the larger are as the filter openings of the coarse screen holds back.
  • the fine sieve stops correspondingly finer particles back, while at least a portion of the liquid phase, and very small particles, which also have to be removed, from the screening stage, or from the screening drum in single-stage pusher centrifuges, directly drained.
  • the configuration of the prefilter sieve as a two-stage sieve has the particular advantage that the fine sieve by large and / or heavy particles, which in the incoming Mixture may be included, is not mechanically stressed so much, so that the Fine sieve, for example, very small pores for filtering very small particles and in particular also of mechanically less resistant Materials can be made.
  • the mixture distributor a Vorbevantung funnel include, for example, substantially extending conically towards the feed device and extends in the special, for example, rotatably connected to the push floor device can.
  • the mixture distributor comprises an inlet funnel for Pre-acceleration of the mixture, wherein the inlet funnel about a drive axis is rotatably mounted and by means of a drive, regardless of the Rotation speed of the outer screen drum, with a predefined speed is rotatable about the drive axis.
  • the pre-acceleration funnel also be designed as Vorbeschreibungssieb, wherein the Vorbeuggungssieb substantially conically widening in the direction of Feed device extends out.
  • the pre-acceleration funnel is configured as a pre-acceleration screen
  • Part of the liquid phase in Vorbevantungssieb is separable from the mixture and the mixture is in the pre-acceleration screen to a predeterminable Rotation speed pre-accelerated, so that of the Feed introduced mixture before reaching the drum at Single-stage pusher centrifuges, or in multi-stage pusher centrifuges before reaching the screening stage, can be accelerated to a predetermined peripheral speed.
  • the mixture unlike that of the prior art known pusher centrifuges, not in the region of the pre-acceleration funnel abrupt, i. not in the shortest possible time to the full rotational speed of Grain drum is accelerated, for example, grain break and others damaging effects on the mixture preventable.
  • This is in particular also mechanically very sensitive substances, even at extremely high levels Rotation speeds of the screen drum processable.
  • the pre-acceleration hopper and / or the inlet funnel with respect on the axis of rotation of the screen drum have an opening angle smaller than Is 90 °, is in the pre-acceleration screen and / or in the inlet funnel the Flow velocity of the mixture compared to the velocity in free fall, i.e. without Vorbe instructung funnel and / or without inlet funnel, in the direction of Peripheral surface of the screening stage or the sieve drum selectively changeable, so that the Mixture in the region of the pre-acceleration funnel and / or the inlet funnel with increasing approach to the outer ring area in both radial Direction as well as in the circumferential direction of the screen drum is gradually accelerated.
  • the mixture is in the region of the pre-acceleration funnel and / or the inlet funnel in a particularly gentle way gradually to a predeterminable peripheral speed accelerated, in order then to reach the Peripheral surface of the outer screening drum or the screening stage finally the full To achieve rotation speed of the outer screen drum.
  • the value of the opening angle of the inlet funnel and / or the value of Vorbevantungswinkels the Vorbevantungstrichters can in relation to on the axis of rotation, for example, between 0 ° and 45 °, in detail between 0 ° and 10 ° or between 10 ° and 45 °, in particular between 25 ° and 45 °, preferably between 15 ° and 35 °.
  • the value of the opening angle and / or the Pre-acceleration angle is greater than 45 °.
  • the pre-acceleration funnel is configured as a pre-acceleration screen
  • the pre-acceleration can be advantageous as Zweilabnsieb be configured with a coarse filter and a fine filter.
  • the Mixture can thereby also in the field of Vorbeuggungssiebs, analogous to the arrangement of a two-stage sieve at the inlet funnel with the already detailed explained advantages are filtered in two stages.
  • the inlet funnel and / or the pre-acceleration funnel as skeletal Be configured supporting body, for forming the prefilter and / or the Vorbeuggungssiebs may be equipped with special filter films, i. of the skeletal support body can, for example, with one or more filter screens, the possibly for the deposition in different stages of different sizes Filter openings may be equipped.
  • filter sieves are used as filter sieves or For example, screen plates in question.
  • the filter screens can be advantageous different way provided with filter openings of different sizes become.
  • the aforementioned screen plates can, inter alia punched, drilled, lasered, electron beam punched or water jet cut
  • other techniques come into question.
  • the sieves themselves Depending on the requirements, you can choose from different, in particular corrosion resistant materials, such as plastic, Composite materials or different steels such as 1.4462, 1.4539 or 2.4602 or made of other suitable materials.
  • the filter screens can wear with suitable layers be provided, for example, with hard chrome layers, tungsten carbide (WC), Ceramics or hardened differently.
  • the strength of the filter sheets is typically 0.2 mm to 5 mm, although significantly different sheet thicknesses possible are.
  • the mixture should not be deposited liquid phase, because, for example, the Part of liquid phase in the incoming mixture is not high enough, a Pre-filtration of the mixture in the pre-acceleration funnel and / or in Feeding funnel naturally omitted.
  • the pre-acceleration screen Collecting means for discharging from the pre-acceleration screen Be provided liquid phase.
  • the liquid phase for example, by a Drain opening in the push floor device in an area between a rear drum wall, which is perpendicular to the axis of rotation, and a wall of the Housing, which separates the drum from the drum drive done.
  • the im Collecting agent collected, deposited on Vorfiltersieb liquid phase is thus through the drain opening in the push floor device and then through the Sieve opening from the screening drum in a particularly simple manner dischargeable.
  • in the area of the inlet funnel may be arranged, described in detail, other suitable devices for Removal of the liquid phase can be provided from the screen drum.
  • the pre-acceleration funnel or the Vorbeuggungssieb be driven separately via a rotary drive.
  • the Pre-acceleration funnel is then preferably designed and arranged such that the pre-acceleration hopper by means of a rotary drive about an axis of rotation is rotatable with a predetermined speed.
  • the rotation axis for Example arranged inside the push rod concentric to this and be driven independently of this by the rotary drive.
  • the Push bottom device preferably rotatably connected to the outer screen drum and with respect to rotation about the axis of rotation of the pre-acceleration screen decoupled.
  • the moving floor device rotates synchronously, for example with the outer screen drum, during the pre-acceleration hopper independently is drivable by the rotational speed of the outer screen drum.
  • the sliding floor device synchronously rotated with the pre-acceleration funnel, that is, push floor device and pre-acceleration funnel together with a predetermined speed and regardless of the speed of the outer screen drum, are drivable.
  • other ways of coupling rotary actuator and pre-acceleration funnel and / or push floor device possible, for example via suitable gear arrangements or any other suitable Wise.
  • the pre-acceleration funnel For controlling and / or regulating the rotational speed of Rotary drive and thus the pre-acceleration funnel can be suitable means be provided to the rotary drive, for example, depending on various operating parameters of the pusher centrifuge or depending on the to control and / or regulate the processing mixture or other factors.
  • the inventive pusher centrifuge and corresponding sensors to measure relevant operating parameters.
  • Fig. 1 shows in section in a schematic representation essential components a first embodiment of a pusher centrifuge according to the invention, which as a funnel for pre-acceleration of the mixture one by one Has drive shaft rotatably arranged inlet funnel. It is in Fig. 1 exemplified schematically a two-stage pusher centrifuge. It understands itself that the representation of FIG. 1 is to be understood as an example and the Description, of course, also for single-stage pusher centrifuges and also for more than two-stage pusher centrifuges applies in an analogous manner and accordingly is transferable.
  • the thrust centrifuge according to the invention which in the following with the total Reference numeral 1 is designated, serves to separate a mixture 2 in one Solid cake 3 and in a liquid phase 4 and includes as essential Components one about a rotational axis 5 about a drum axis 51 rotatable outer screen drum 6, which is housed in a housing G.
  • the Drum axis 51 is connected to a drum drive, not shown, in itself known manner in operative connection, so that the screen drum 6 through the Drum drive in fast rotation about the axis of rotation 5 is displaceable.
  • multi-stage pusher centrifuges 1 such as For example, in Fig.
  • a mixture distributor 7 with a push floor device 8 and a Feed device 9 is provided, either the screening stage 14 or as For example, shown in Fig. 3, the sliding floor device 8 along the Rotary axis 5 is arranged back and forth, so that the solid cake 3rd is displaceable by means of the sliding floor device 8.
  • a Inlet pipe 9 may include, for pre-acceleration in the inlet funnel 101st einspeisbar, which is essentially conically widening in the direction of Schubêtvoriques 8 extends, wherein the inlet funnel 101 to a Drive shaft 11, 111 rotatably mounted and by means of a drive 12, 121 with a predetermined speed about the drive axis 111 is rotatable. It can suitable, not shown here means be provided to the drive 121st for example, depending on the mixture to be processed 2 or in Dependence on suitable operating parameters of the pusher centrifuge 1 to control and / or to regulate.
  • the pusher bottom device 8 is so as a ring portion 81 formed so that with the annular region 81 in single-stage pusher centrifuges 1 of in the screening drum 6, and in multi-stage pusher centrifuges 1 in the screening stage 14, deposited solid cake 3 by a detailed below Oscillation along the axis of rotation 5 of the sliding floor device 8 and / or the Level 14, in single-stage pusher centrifuges 1 from the screening drum 6, or at multi-stage pusher centrifuges 1 in the screening drum 6 or in another not illustrated screening stage 14, is displaceable.
  • the push floor device 8 rotates in that shown in Fig. 1 Embodiment of an inventive pusher centrifuge 1 synchronously with the Sieve drum 6 about the axis of rotation 5.
  • the oscillatory motion, by the Double arrow is indicated in Fig. 1, performs in the example shown here the Sieve stage 14, while the push floor device 8 does not oscillate.
  • the oscillatory motion is preferably by means of a Not shown here Um Kunststoffmechanismus generated and a push rod P transmitted, wherein in a first half-period of the oscillatory motion with the outer ring portion 81 of the sliding floor device 8 deposited Solid cake 3 in ring sections whose width by the stroke length of Oscillation movement is determined, is pushed out of sieve drum 6. While a second half period of the oscillatory motion creates the void R in the screen drum 6, so that in the void R new mixture 2 can be introduced.
  • the mixture distributor 7 additionally comprises a the push floor device 8 rotatably connected pre-acceleration funnel 102, which is essentially conically widening in the direction of the feed device 9 extends.
  • FIG. 2a and 2b is an example and schematically each an embodiment a funnel 10 shown.
  • a pre-acceleration funnel 102 is shown.
  • FIG. 2b the example shown in FIG Geometry of a funnel 10 both on the inlet funnel 101 and on the Pre-acceleration funnel 102.
  • the outer ring portion 81 has a specifiable height a, depending on the mixture to be processed 2 and / or the Operating conditions under which the inventive pusher centrifuge 1 about 1% to 40% of the drum radius r, preferably about 5% to 10%, in particular 5% to 20% of the drum radius r.
  • the funnel 10 may be formed as a multi-stage funnel 10, wherein the funnel 10 for pre-acceleration of the mixture 2, at different angles ⁇ 1 , ⁇ 2 mutually inclined partial surfaces may have, wherein the relative size the partial surface and their inclination angle ⁇ 1 , ⁇ 2 may depend, for example, on the mixture 2 to be processed or on the operating parameters of the pusher centrifuge 1.
  • both the inlet funnel 101 and the pre-acceleration funnel 102 according to FIG. 2b can be configured as a multi-stage funnel.
  • the inlet funnel 101 as a prefilter 1011 is designed for the pre-separation of liquid phase 4, it can from be particularly advantageous if the inlet funnel 101 has a curved course and the opening angle ⁇ of the inlet funnel 101 as shown in Figs. 2c and 2d shown schematically, enlarged in the direction of the sliding floor device 8 out or reduced.
  • the pusher centrifuge 1 for example in Dependence on the particle size and / or the viscosity and / or other Properties or parameters, such as the temperature of the mixture 2, Different drainage are good.
  • the inlet funnel 101 or the prefilter 1011 has a curved course, wherein the Opening angle ⁇ of the prefilter screen 1011 in the direction of the sliding floor device 8 enlarged.
  • Such a special embodiment of an inlet funnel 101 is shown schematically in Fig. 2c. That is, the inlet funnel 101 or the Pre-filter screen 1011 expands toward the push floor device 8 similarly the horn of a trumpet.
  • the Vorbeuggungsstrichter 102 and the pre-acceleration screen 1021 a have curved course, wherein the pre-acceleration angle ⁇ of the Vorbevantungstrichters 102 towards the feed device 9 out enlarged or reduced.
  • Pusher centrifuge 1 In practice, it can be of great importance to accelerate itself or the rotational speed to which the mixture 2 im Vorbevantung funnel 102 is accelerated to control targeted.
  • the pre-acceleration hopper 102 is so designed and arranged that the pre-acceleration hopper 102 by means of a Rotary drive 122 about a rotation axis 112 with a predetermined speed, regardless of the speed of the screen drum 6, is rotatable.
  • the rotation axis 112 may be exemplified as shown in Fig. 3, for example, within the Be arranged push rod P.
  • suitable, not shown here Means be provided to the drive 12, for example, depending on the to be processed mixture 2 or depending on suitable Operational parameters of the pusher centrifuge 1 to control and / or to regulate.
  • an inlet funnel 101 may additionally be provided, which in addition by means of a separate drive 121 about a drive axis 111 with a predeterminable speed can be driven.
  • a splash guard 91 which can be mounted on supports 911 on the push floor device 8 and in which the feed device 9 opens, also missing.
  • Pre-acceleration hopper 102 may be preferred, but not necessary for example, in one direction of the oscillatory motion with another Rotate rotational speed, as in the opposite oscillatory motion.
  • the Rotational frequency of the pre-acceleration hopper 102 are selected so that the Pre-acceleration hopper 102 rotates synchronously with the outer screen drum 6, so that between the outer ring portion 81 and the solid cake 3, on the Peripheral surface 62 of the screening drum 6 is deposited, when moving no Realtivmony with respect to the rotation around the Drechchse 5 is present, while the Rewind, ie in the phase of Osillationsterrorism in the space R with new mixture 2, the pre-acceleration hopper 102, for example rotates slower than the outer screen drum 6.
  • the in Fig. 3 Pusher centrifuge 1 shown of course, as a multi-stage Pusher centrifuge 1 be designed and as a multi-stage pusher centrifuge, such as will be described in more detail below, be operated
  • Fig. 3a shows a further embodiment according to FIG. 3 with a Blind bottom 811 designed outer ring portion 81, which synchronously with the Vorbevantungstrichter 102 oscillates, and at the same speed as the outer screen drum 6 rotates, in the present embodiment shown generally different from the speed of the pre-acceleration hopper 102 is.
  • the blind bottom 811 via at least one securing strut 812 rotatably with the outer screening drum.
  • the attachment strut 812 via a thrust element 813 that, for example, the rotary axis 5 can comprise a ring or else as simple support strut 813 may be formed by means of a decoupling socket 814 shear-resistant coupled with the push rod P.
  • the Decoupling socket 814 for decoupling the rotational movement of the Schubelemnts 813 from the rotational movement of the pre-acceleration hopper 102 for example a ball bearing mechanism include or otherwise suitable for Decoupling of the relative rotational movements designed and arranged.
  • the decoupling socket 814 may also be shown as not shown in Fig. 3a
  • Decoupling element 814 may be formed, for example, suitably between Push rod P and sliding floor device 8 may be arranged and formed can.
  • the pre-acceleration hopper 102 completely independent of the speed of the outer sieve drum 6 with a mixture to be processed on the second tunable rotational frequency drivable and on the other hand rotates the blind floor 811, which transports the solid cake 3 in the axial direction with the same Speed as the sieve drum 6, so that between the blind bottom 811 and sieve drum 6 relative to the rotation about the rotation axis 5 no relative movement takes place.
  • the rotational speed for example, depending on a current operating state of Pusher centrifuge 1, as already described above, be variable.
  • Fig. 4 shows a further embodiment of an inventive Pusher centrifuge 1, in which the inlet funnel 101 as a prefilter screen 1011 to Pre-separation of liquid phase 4 from the mixture 2 is formed and around the Drive axle 111 by means of the drive 121 with a predetermined speed is drivable.
  • a significant advantage of this embodiment consists in this case in that a part of the liquid phase 4 is already in the prefilter sieve 1011 from the mixture 2 is separable and the mixture 2 in the prefilter 1011 to a predeterminable Rotation speed is pre-accelerated, so that the of the Feed device 9 introduced mixture 2 before reaching the screen drum 6, at single-stage pusher-type centrifuges 1, or in multi-stage pusher-type centrifuges 1 Reaching the screening stage 14, to a predetermined peripheral speed is acceleratable. This does not require the entire amount of liquid phase 4, the contained in the mixture 2, to the full peripheral speed of the screen drum. 6 be accelerated because part of the liquid phase 4 already on the prefilter 1011 deposited and from screening drum 6 or from the screening stage 14 separable is.
  • mixtures 2 with a very high content of liquid phase 4 easy to process.
  • a high content of Liquid phase 4 always a uniform distribution of the mixture to be dried. 2 over the peripheral surface 142 of the screening stage 142 and over the peripheral surface 62 of the Screen drum 6 guaranteed.
  • additional pre-drainage devices such as For example, static thickeners, curved screens or hydrocyclones superfluous. there are smallest particles contained in the mixture 2 by the effect of Pre-filtration much more effectively separated from the solid cake 3.
  • the derivation of the liquid phase 4, the pre-filter 1011 in the collecting means 13th was deposited, preferably via a conduit means 131, the e.g. a suitably designed and arranged in the pusher centrifuge 1 suitably Piping 131 may include.
  • the collecting means 13 has to carry out the conduit means 131 in the interior of the collecting means 13 a, via a the feeding device 9 facing side circular-shaped Opening groove 132, so that the rotational movement of the prefilter screen 1011 through the conduit means 131 is not hindered.
  • the prefilter sieve 1011 can also be used as a two-stage sieve be designed a coarse filter and a fine screen.
  • the first filter stage forms the Coarse sieve, which contained in the mixture 2 particles that are larger than that Retains filter openings of the coarse filter.
  • the fine sieve keeps correspondingly finer Particles back, while at least part of the liquid phase 4, as well as very small Particles, which must also be removed, from the screening stage 14, or from the Sieve drum 6 in single-stage pusher centrifuges 1, are directly drained.
  • the Design of the prefilter screen 1011 as a two-stage screen has in particular the Advantage that the fine sieve by large and / or heavy particles, in the incoming mixture 2 may be included, not mechanically so heavily loaded So, for example, the fine screen has very small pores for filtering very much may have small particles and in particular also mechanically little resistant materials can be made.
  • FIG. 5 shows an exemplary embodiment of a pusher centrifuge 1 according to the invention in which the separately drivable Vorbeschreibungstrichter 102 as Vorbevantungssieb 1021 for pre-separation of liquid phase 4 from the Mixture 2 is configured.
  • the pre-acceleration screen 1021 is here designed as a two - stage sieve with a coarse sieve and a fine sieve, what the previously already described in detail on the example of the prefilter screen 1011 advantages brings with it.
  • the pre-acceleration screen 1021 need not be considered Be designed two-stage screen.
  • the pre-acceleration funnel 102 or the pre-acceleration screen 1021 points while with respect to the rotation axis 5, a pre-acceleration angle ⁇ , which in Reference to the axis of rotation 5, for example, between 0 ° and 45 °, in detail between 0 ° and 10 ° or between 10 ° and 45 °, in particular between 25 ° and 45 °, preferably between 15 ° and 35 °.
  • a pre-acceleration angle ⁇ which in Reference to the axis of rotation 5, for example, between 0 ° and 45 °, in detail between 0 ° and 10 ° or between 10 ° and 45 °, in particular between 25 ° and 45 °, preferably between 15 ° and 35 °.
  • the value of the opening angle ⁇ and / or the Pre-acceleration angle ⁇ is greater than 45 °.
  • the inlet funnel 101 is configured as a prefilter screen 1011 and by means of one or more fastening supports 15 on the screening drum 6 arranged.
  • the mounting posts 15 are preferably in the form of suitable formed spokes 15, thin rods 15 or tubes 15, so that in the Operating state of the solid cake 3 easily from the screening stage 14 or from the Sieve drum 6 is removable.
  • the prefilter sieve 1011 by means of one or a plurality of mounting posts 15 also be arranged on a screening stage 14 or even at several screening stages 14 or at a screening stage 14 and at the screening drum 6, wherein the respective drums preferably no Perform oscillatory relative movement against each other.
  • Pre-acceleration hopper 102 may be preferred, but not necessary or Vorbeuggungssieb 1021, for example, in a direction of Oscillation movement of the screening stage 14 at a different rotational speed rotate, as in the opposite oscillation movement of the screening stage 14.
  • the rotational frequency of the pre-acceleration hopper 102 are selected so that the Vorbevantung funnel 102 rotates synchronously with the screening stage 14, so that between the outer ring portion 81 and the solid cake 3, on the Peripheral surface of the screening stage 14 is deposited, when moving no Relative movement with respect to the rotation around the Dreachse 5 is present during the Rewind, ie in the phase of Osillationsmos in the space R with new mixture 2, the pre-acceleration hopper 102, for example rotates slower than the screening stage 14.
  • FIG. 5a finally, an embodiment according to FIG. 5 with a Blind bottom 811 shown schematically, wherein the pre-acceleration screen 1021 for the sake of clarity, is not shown as a two-stage screen.
  • both the pre-acceleration screen 1021 and the prefilter screen can be used 1011 be designed as a one, two or multi-stage screen.
  • the embodiment according to FIG. 5 a has a blank bottom 811 designed outer ring portion 81, which synchronously with the outer Screening drum 6 rotates, however, from the pre-acceleration hopper 102 with respect to Is decoupled rotational movement, so that the pre-acceleration funnel 102 or the Vorbevantungssieb 1021 at a different speed than the blindfloor 811 is rotatable about the axis of rotation 5.
  • a blank bottom 811 designed outer ring portion 81 which synchronously with the outer Screening drum 6 rotates, however, from the pre-acceleration hopper 102 with respect to Is decoupled rotational movement, so that the pre-acceleration funnel 102 or the Vorbeuggungssieb 1021 at a different speed than the blindfloor 811 is rotatable about the axis of rotation 5.
  • the blind bottom 811 via at least one mounting strut 812th rotatably connected to the outer screen drum 6, wherein the Mounting strut 812 through a suitably placed opening 143 in the screening stage 14 is guided, so that the fastening strut 812 of the oscillatory motion of the Level 14 is decoupled.
  • the embodiment gemäs Fig. 5a also applicable to higher-level than two-stage pusher centrifuges 1 analog transferable.
  • the pre-acceleration hopper 102 completely independent of the speed of the outer sieve drum 6 with a mixture to be processed on the second tunable rotational frequency drivable and on the other hand rotates the blind floor 811, which transports the solid cake 3 in the axial direction with the same Speed as the sieve drum 6 and the screening stage 14, so that between the blind floor 811 and screening stage 14 with respect to the rotation about the rotation axis 5 none Relative movement takes place.
  • too Rotation speed for example, depending on a current Operating state of the pusher centrifuge 1, as already described above, variable be.
  • inter alia grain breakage is avoidable, so that in particular also substances that are particularly sensitive to abrupt Changes in a centrifugal or radial acceleration react, under Compliance with the highest quality standards are processed.

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EP04405167A 2003-04-16 2004-03-18 Centrifugeuse à poussoir avec cone rotatif pour pre-accélerer le mélange Expired - Lifetime EP1468744B1 (fr)

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EP03405275 2003-04-16
EP03405275 2003-04-16
EP04405167A EP1468744B1 (fr) 2003-04-16 2004-03-18 Centrifugeuse à poussoir avec cone rotatif pour pre-accélerer le mélange

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US (1) US7032759B2 (fr)
EP (1) EP1468744B1 (fr)
JP (1) JP4628694B2 (fr)
AT (1) ATE397496T1 (fr)
DE (1) DE502004007309D1 (fr)

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US7815072B2 (en) 2004-05-06 2010-10-19 Diversey, Inc. Metering and dispensing closure
US7950550B2 (en) 2004-05-06 2011-05-31 Diversey, Inc. Metering and dispensing closure
CN104668112A (zh) * 2015-02-06 2015-06-03 江苏牡丹离心机制造有限公司 下卸料离心机中的布料装置
EP2946835A1 (fr) 2014-05-22 2015-11-25 Ferrum AG Centrifugeuse, ainsi que dispositif de pré-accélération pour une centrifugeuse
IT202100000035A1 (it) * 2021-01-04 2022-07-04 Schlumberger Technology Corp Centrifughe decanter e condotti di accelerazione e procedimenti associati

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DE602005010362D1 (de) * 2004-11-02 2008-11-27 Shinetsu Chemical Co Verfahren zur Abtrennung wasserlöslicher Celluloseether
DE102005028832A1 (de) * 2005-06-15 2006-12-28 Fima Maschinenbau Gmbh Zentrifugenvorrichtung mit verbesserter Prozessanalysetechnologie
CN102671777B (zh) * 2012-04-11 2013-09-25 浙江轻机实业有限公司 双级活塞推料离心机间歇进料结构
RU2646928C2 (ru) * 2013-12-18 2018-03-12 Эф-Эл-Смидт А/С Распределитель для шнекового фильтрующего центробежного сепаратора
ES2800499T3 (es) * 2014-02-26 2020-12-30 Ferrum Ag Centrífuga así como procedimiento para cargar una centrífuga
JP2015202448A (ja) * 2014-04-14 2015-11-16 中部クリーン株式会社 固液分離装置
SE543603C2 (sv) * 2019-08-09 2021-04-13 556958 7768 Thordab Industri Innovation Ab Filtreringsanordning innefattande minst en roterande filterenhet
KR102504659B1 (ko) * 2019-11-18 2023-02-27 주식회사 엘지화학 가압 원심 탈수기
KR102504657B1 (ko) * 2019-11-18 2023-02-27 주식회사 엘지화학 가압 원심 탈수기
CN112317143A (zh) * 2020-09-27 2021-02-05 濮阳天健生物科技有限公司 一种合成5-甲基四唑用过滤离心分离器
CN114733249B (zh) * 2022-06-14 2022-09-09 山西省科技情报与战略研究中心 固液分离处理系统
CN116351141B (zh) * 2023-05-24 2023-08-11 汕头市精工东捷制版有限公司 激光喷淋腐蚀液过滤装置及其在版辊铜层处理中的应用

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7815072B2 (en) 2004-05-06 2010-10-19 Diversey, Inc. Metering and dispensing closure
US7950550B2 (en) 2004-05-06 2011-05-31 Diversey, Inc. Metering and dispensing closure
US8261951B2 (en) 2004-05-06 2012-09-11 Diversey, Inc. Metering and dispensing closure
US8276790B2 (en) 2004-05-06 2012-10-02 Diversey, Inc. Metering and dispensing closure
US8833614B2 (en) 2004-05-06 2014-09-16 Diversey, Inc. Metering and dispensing closure
EP2946835A1 (fr) 2014-05-22 2015-11-25 Ferrum AG Centrifugeuse, ainsi que dispositif de pré-accélération pour une centrifugeuse
CN104668112A (zh) * 2015-02-06 2015-06-03 江苏牡丹离心机制造有限公司 下卸料离心机中的布料装置
CN104668112B (zh) * 2015-02-06 2017-12-08 江苏牡丹离心机制造有限公司 下卸料离心机中的布料装置
IT202100000035A1 (it) * 2021-01-04 2022-07-04 Schlumberger Technology Corp Centrifughe decanter e condotti di accelerazione e procedimenti associati

Also Published As

Publication number Publication date
ATE397496T1 (de) 2008-06-15
DE502004007309D1 (de) 2008-07-17
JP4628694B2 (ja) 2011-02-09
US20040206688A1 (en) 2004-10-21
EP1468744B1 (fr) 2008-06-04
JP2004351412A (ja) 2004-12-16
US7032759B2 (en) 2006-04-25

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