DK170967B1 - decanter centrifuge - Google Patents

decanter centrifuge Download PDF

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Publication number
DK170967B1
DK170967B1 DK65190A DK65190A DK170967B1 DK 170967 B1 DK170967 B1 DK 170967B1 DK 65190 A DK65190 A DK 65190A DK 65190 A DK65190 A DK 65190A DK 170967 B1 DK170967 B1 DK 170967B1
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Prior art keywords
inlet
end wall
decanter centrifuge
centrifuge according
projection
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DK65190A
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Danish (da)
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DK65190D0 (en
DK65190A (en
Inventor
Bent Madsen
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Alfa Laval Separation As
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Application filed by Alfa Laval Separation As filed Critical Alfa Laval Separation As
Priority to DK65190A priority Critical patent/DK170967B1/en
Publication of DK65190D0 publication Critical patent/DK65190D0/en
Priority to DE69104715T priority patent/DE69104715T2/en
Priority to EP91906597A priority patent/EP0520010B1/en
Priority to PCT/DK1991/000075 priority patent/WO1991013686A1/en
Priority to JP3506758A priority patent/JP2987519B2/en
Publication of DK65190A publication Critical patent/DK65190A/en
Priority to US08/193,649 priority patent/US5374234A/en
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Publication of DK170967B1 publication Critical patent/DK170967B1/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B04CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04BCENTRIFUGES
    • B04B1/00Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/20Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B04CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04BCENTRIFUGES
    • B04B1/00Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/20Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
    • B04B2001/2033Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl with feed accelerator inside the conveying screw

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  • Centrifugal Separators (AREA)

Description

i DK 170967 B1in DK 170967 B1

Opfindelsen angår en dekantercentrifuge omfattende en roterbart lejret tromle og en i tromlen roter-bart lejret transportør med en transportørkrop, der indeholder et som et hulrum udformet indløb for feeden, 5 der skal separeres, hvilket indløb radialt er begrænset af en med transportørkroppen koaksial væg, der indeholder indløbsåbninger, der forbinder indløbet med det mellem transportørkroppen og tromlens inderside beliggende rum, og hvor et periferiområde af indløbet, be-10 grænset udadtil af radius til indløbsåbningerne, er frit for medbringere, indragende fremspring eller lignende, et med tromlen koaksialt indløbsrør for feeden, og ved tromlens ene ende en udløbskant for den fraseparerede væskefase.BACKGROUND OF THE INVENTION The invention relates to a decanter centrifuge comprising a rotatably-mounted drum and a drum-rotatably mounted conveyor having a conveyor body containing a cavity-shaped inlet for the feeder to be separated, which inlet is radially limited by a coaxial wall with the conveyor body, containing inlet openings connecting the inlet to the space located between the conveyor body and the inside of the drum, and in which a peripheral area of the inlet, bounded externally by the radius of the inlet openings, is free of carriers, projecting projections or the like, a coaxial inlet pipe for the drum the feed, and at one end of the drum an outlet edge for the separated liquid phase.

15 Fra GB patentskrift nr. 1 025 079 kendes en de kantercentrifuge af ovennævnte art, i hvilken indløbet radialt begrænses af en cirkulærcylindrisk væg og aksi-alt begrænses ved den ene ende af en endevæg, der danner en konusflade med en åbning for et i indløbet ind-20 ragende indløbsrør, hvis munding er beliggende ved konusfladens lilleende, og peger i en retning, der er vinkelret på tromleaksen. I den cirkulærcylindriske, radiale væg er fordelt et stort antal indløbsåbninger.15 from GB patent specification 1 025 079 is known an edge centrifuge of the above-mentioned kind, in which the inlet is radially limited by a circular cylindrical wall and is limited at one end by an end wall forming a cone surface with an opening for an inlet projecting inlet tubes, the mouth of which is located at the lower end of the cone surface, and points in a direction perpendicular to the drum axis. A large number of inlet openings are distributed in the circular cylindrical radial wall.

Dekantercentrifugen har yderligere et tilsæt-25 ningsrør for et flokkuleringsmiddel. Dette tilsætningsrør er ført ind i indløbet gennem indløbsrøret og er koncentrisk med dette. Formålet med tilsætningsrøret er at flokkuleringsmidlets skal kunne tilsættes feeden efter at denne er blevet accelereret op til en vinkelha-30 stighed, der i det væsentlige svarer til vinkelhastigheden af tromlen. I tidligere centrifuger blev flokku-leringsmidlet tilsat feeden før denne blev indført i indløbet. Dette resulterede i at feeden med flokkuleringsmiddel blev udsat for store indre forskydnings-35 kræfter under accelerationen til den nævnte vinkelhastighed, så allerede udfældet materiale igen blev sønderdelt.The decanter centrifuge further has an additive tube for a flocculant. This addition tube is introduced into the inlet through the inlet tube and is concentric with this. The purpose of the addition tube is that the flocculant must be capable of being added to the feed after it has been accelerated up to an angular velocity substantially equal to the angular velocity of the drum. In previous centrifuges, the flocculant was added to the feed before it was introduced into the inlet. This resulted in the flocculant feed being subjected to large internal shear forces during the acceleration to said angular velocity, so that already precipitated material was again decomposed.

DK 170967 B1 2DK 170967 B1 2

Fra US patentskrift nr. 3 143 504 kendes en anden dekantercentrifuge af ovennævnte art, i hvilken indløbet radialt afgrænses af en cirkulærcylindrisk væg og aksialt af en endevæg, der er plan og vinkelret på 5 tromleaksen, medens en anden endevæg danner en konusflade med en åbning for et i indløbet indragende indløbsrør, hvis munding er beliggende ved konusfladens lille ende, og ligger i et plan, der er parallelt med tromleaksen. I den cirkulærcylindriske væg er fordelt 10 et stort antal indløbsåbninger til udledning af sediment, og i den plane endevæg er der indløbsåbninger gennem hvilken væskefasen forlader indløbet.US Patent No. 3,143,504 discloses another decanter centrifuge of the above-mentioned kind, in which the inlet is radially defined by a circular cylindrical wall and axially of an end wall which is flat and perpendicular to the drum axis, while another end wall forms a cone surface with an opening for an inlet tube projecting into the inlet, the mouth of which is located at the small end of the cone surface, and lies in a plane parallel to the drum axis. In the circular cylindrical wall 10 is distributed a large number of inlet openings for discharge of sediment, and in the planar end wall there are inlet openings through which the liquid phase leaves the inlet.

I begge disse kendte dekantercentrifuger strømmer eller falder feeden fra indløbsrøret direkte ud på 15 den anden endevægs konusflade, hvor den i løbet af en brøkdel af et sekund accelereres til samme vinkelhastighed, som transportøren. Som følge af overløbskantens beliggenhed dannes på indervæggen af indløbet et tyndt væskelag i hvilket der sker en begyndende separe-20 ring. De udseparerede faste stoffer strømmer gennem indløbsåbningerne ind i rummet mellem transportørkroppen og tromlens inderside, hvor de føres aksialt bort af en transportsnegl på kendt måde.In both of these known decanter centrifuges, the feed flows from or falls from the inlet pipe directly onto the cone surface of the second end wall, where it is accelerated for a fraction of a second to the same angular velocity as the conveyor. Due to the location of the overflow edge, a thin liquid layer is formed on the inner wall of the inlet, in which an initial separation occurs. The separated solids flow through the inlet openings into the space between the conveyor body and the inside of the drum, where they are axially guided by a conveyor screw in known manner.

I sidstnævnte patentskrift angives, at det er u-25 heldigt at lade separeringen finde sted i rummet mellem transportørkroppen og tromlens inderside, fordi transportsneglen her fremkalder kraftige turbulente strømme, der hindrer en god separering, hvorimod separering allerede i indløbet er at foretrække fordi det rum, hvori 30 separeringen foregår er frit for indbyggede dele, såsom vinger, ledeplader, transportsnegle og lignende elementer, der kan virke forstyrrende på separeringen.The latter patent states that it is unfortunate for the separation to take place in the space between the conveyor body and the inside of the drum, because the conveyor screw here induces strong turbulent currents which prevent good separation, whereas separation in the inlet is preferable because that space wherein the separation takes place is free of built-in parts such as wings, baffles, conveyor screws and similar elements which may interfere with the separation.

Begge dekantercentrifuger repræsenterer forsøg på at løse et problem, der er generelt for dekantercen-35 trifuger af denne art, nemlig at feeden under accelerationen til transportørkroppens vinkelhastighed tilføres 3 DK 170967 B1 omkring dobbelt så meget energi, som den der er nødvendig for at væsken skal kunne danne et væskelag langs indløbets inderside. Den overskydende energi afsættes i væsken i centrifugen som uønskede turbulensstrømninger, 5 der fra indløbet strækker sig ud i rummet mellem transportørkroppen og tromlens inderside hvor energien sluttelig omsættes til varme.Both decanter centrifuges represent attempts to solve a problem that is generally for decanter centrifuges of this kind, namely that the feed under the acceleration to the angular velocity of the conveyor body is supplied about twice as much energy as that required for the liquid to could form a fluid layer along the inside of the inlet. The excess energy is deposited in the liquid in the centrifuge as unwanted turbulence flows, extending from the inlet into the space between the conveyor body and the inside of the drum where the energy is finally converted to heat.

At væsken tilføres overskydende energi indses ved at betragte en enhedsterning af væske, der befin-10 der sig ved den indvendige væskeoverflade i indløbet. Denne terning vil have en kinetisk energi, der er givet ved ½p(ύ2r2, hvor ω er transportørkroppens vinkelhastighed, og r er 15 radius til overløbskanten. Væsketerningens impulsmoment L omkring rotationsaksen er poor2.That the liquid is supplied with excess energy is realized by considering a unitary cube of liquid located at the inner liquid surface of the inlet. This cube will have a kinetic energy given at ½p (ύ2r2, where ω is the angular velocity of the conveyor body and r is 15 radius to the overflow edge. The momentum of the liquid cube L about the axis of rotation is poor2.

Dette impulsmoment er opnået ved påvirkninger fra indløbet, der roterer med vinkelhastigheden ω. Den tilfør-20 te energi fra motoren, der driver dekantercentrifugen er derforThis momentum is obtained by inputs from the inlet rotating with the angular velocity ω. Therefore, the added energy from the engine driving the decanter centrifuge is

Laj=pco2r2.Laj = pco2r2.

Det ses at denne energi er dobbelt så stor som den ovenfor anførte energi, der var nødvendig for at holde væ-25 sketerningen i den fri overflade.It will be seen that this energy is twice as large as the energy mentioned above, needed to keep the liquid ring in the free surface.

I de kendte centrifuger kan den overskydende energi ikke afsættes i væsken eller dissiperes uden at give anledning til forstyrrende væskestrømme i det forholdsvis tynde væskelag på indløbets inderside, hvilket 30 forringer effektiviteten af separeringen.In the prior art centrifuges, the excess energy cannot be deposited in the liquid or dissipated without giving rise to disturbing fluid flows in the relatively thin fluid layer on the inside of the inlet, which degrades the efficiency of the separation.

Det er en hovedhensigt med opfindelsen at angive en dekantercentrifuge med et indløb, i hvilket denne overskydende energi kan dissiperes, før feeden strømmer gennem indløbsåbningerne og ud i rummet mellem trans-35 portørkroppen og tromlens inderside, hvor udseparerin-gen af de faste bestanddele fra feeden foregår.It is a principal object of the invention to provide a decanter centrifuge with an inlet in which this excess energy can be dissipated before the feed flows through the inlet openings and into the space between the conveyor body and the inside of the drum, where the separation of the solids from the feed takes place.

DK 170967 B1 4DK 170967 B1 4

Det er en yderligere hensigt med opfindelsen, at angive hvorledes dekantercentrifugens indløb kan udformes for at afpasse strømningen i dette til forskellige gennemstrømningsmængder eller forskellige arter af 5 feed.It is a further object of the invention to provide how the inlet of the decanter centrifuge can be designed to adapt the flow therein to different flow rates or different species of 5 feed.

Dekantercentrifugen ifølge opfindelsen adskiller sig fra de kendte ved at indløbsåbningernes mundinger i indløbet er beliggende på en radius, der er større end radius til udløbskanten, at indløbet aksialt er begræn-10 set af en overfor indløbsrøret beliggende rotationssymmetrisk første endevæg, og en overfor den første endevæg beliggende rotationssymmetrisk anden endevæg, der i midten har et mod den første endevæg ragende fremspring med en aksial boring for indløbsrøret, og at indløbsrø-15 rets munding vender mod indløbet og er beliggende i et plan vinkelret på tromleaksen.The decanter centrifuge according to the invention differs from the known in that the orifices of the inlet openings in the inlet are located at a radius greater than the radius of the outlet edge, that the inlet is axially limited by a rotationally symmetrical first end wall and opposite the first end wall located rotationally symmetrical second end wall having in the middle a projection projecting against the first end wall with an axial bore for the inlet pipe, and the mouth of the inlet pipe facing the inlet and located in a plane perpendicular to the drum axis.

Herved opnås at den gennem indløbsrøret indstrømmende feed ledes som en stråle direkte mod den første endevæg, hvor den deler sig og strømmer ud mod 20 indløbets radialt begrænsende væg. Da væggen ikke indeholder elementer, der bidrager til at sætte feeden i rotation, kan der kun overføres et drejningsmoment til feeden, der er bestemt af friktionen mellem feeden og endevæggens inderside. Vinkelhastigheden af feeden i 25 indløbet kan derfor holdes væsentlig lavere end vinkelhastigheden af transportørkroppen. Den frie væskeoverflade i indløbet vil derfor være beliggende på en væsentlig mindre radius end radius til udløbskanten.Hereby the feed flowing through the inlet pipe is obtained as a beam directly towards the first end wall where it divides and flows out towards the radially limiting wall of the inlet. Since the wall does not contain elements which help to rotate the feeder, only a torque can be transferred to the feeder, which is determined by the friction between the feeder and the inside wall of the feeder. Therefore, the angular velocity of the feeder in the inlet can be kept substantially lower than the angular velocity of the conveyor body. The free liquid surface in the inlet will therefore be located at a substantially smaller radius than the radius of the outlet edge.

Herved opnås, at strømningen i indløbet, når de-30 kantercentrifugen har opnået sin normale driftstilstand, hovedsagelig forløber i retning fra den første endevæg og parallelt med den frie overflade i indløbet mod den anden endevæg, samtidig med, at der foregår en jævn udstrømning gennem indløbsåbningerne. Når feeden 35 befinder sig i nærheden af indløbsåbningerne, har den stort set opnået samme vinkelhastighed som transportør- 5 DK 170967 B1 kroppen, men som følge af den forholdsvis lange strømvej i det tykke væskelag i indløbet er den overflødige energi blevet dissiperet på en sådan måde, at der ikke forekommer turbulente strømninger, der føres med ind 5 gennem indløbsåbningerne til rummet mellem transportørkroppen og tromlens inderside.Hereby, the flow in the inlet, when the edge centrifuge has reached its normal operating state, mainly extends in the direction from the first end wall and parallel to the free surface in the inlet towards the second end wall, while at the same time there is an even flow through inlet openings. When the feeder 35 is in the vicinity of the inlet openings, it has obtained substantially the same angular velocity as the conveyor body, but due to the relatively long flow path in the thick liquid layer in the inlet, the excess energy has been dissipated in such a way. that no turbulent currents are introduced that are fed in through the inlet openings to the space between the conveyor body and the inside of the drum.

En udførelsesform af opfindelsen er ejendommelig ved, at den anden endevægs fremspring har form af en keglestub, hvis spidse ende vender mod den første ende-10 væg. Herved opnås at eventuel luft der findes i feeden eller rives med af denne under indstrømningen i indløbet, kan føres bort langs periferien af den anden endevægs fremspring, så det undgås at der dannes en luftpude i indløbet som kan virke forstyrrende på den til-15 sigtede strømning. Eventuel udskilt luft vil med den angivne udformning af fremspringet, strømme langs dettes periferi og ud af indløbet gennem den aksiale boring i fremspringet.An embodiment of the invention is characterized in that the protrusion of the second end wall takes the form of a cone stub whose pointed end faces the first end wall. In this way, any air contained in the feeder or drawn with it during the inlet flow can be carried away along the periphery of the second end wall projection, thus avoiding the formation of an air cushion in the inlet which may interfere with the intended purpose. flow. Any separated air will, with the design of the projection, flow along its periphery and out of the inlet through the axial bore of the projection.

I foretrukne udførelser af opfindelsen kan den 20 anden endevægs fremspring have hovedsagelig radiale længderibber, der er jævnt fordelt langs fremspringets periferi, eller der kan være en eller flere hovedsagelig radiale ribber, der følger skruelinier langs fremspringets periferi. Herved opnås at der overføres et 25 større moment til væsken i indløbet i tilfælde hvor den fri væskeoverflade nærmer sig fremspringets periferi, f.eks. fordi gennemstrømningsmængden af feeden er forøget. Ved at ændre ribbernes form, f.eks. fra retlinede ribber til ribber der snor sig flere gange om frem-30 springet følgende en skruelinie, kan strømningen rettes stærkere mod den anden endevæg, så der fås en bedre ak-sial fordeling af feeden, og ved at ændre ribbernes radiale udstrækning er det muligt at opnå, at væskens frie overflade ikke kommer ind på en så lille radius, 35 at væsken kan strømme ud igennem boringen for indløbsrøret i fremspringet.In preferred embodiments of the invention, the second end wall projection may have substantially radial longitudinal ribs evenly distributed along the periphery of the projection, or there may be one or more substantially radial ribs that follow helical lines along the periphery of the projection. This results in a greater torque being transferred to the liquid in the inlet when the free liquid surface approaches the periphery of the projection, e.g. because the flow rate of the feed is increased. By changing the shape of the ribs, e.g. from rectilinear ribs to ribs that rotate several times about the projection following a helical line, the flow can be directed more strongly to the other end wall so as to obtain a better axial distribution of the feed, and by changing the radial extent of the ribs obtaining that the free surface of the liquid does not enter such a radius so that the liquid can flow out through the bore of the inlet pipe in the projection.

DK 170967 B1 6DK 170967 B1 6

En anden foretrukken udførelsesform er ejendommelig ved, at den første endevæg i midten har en mod indløbsrøret fremspringende prelknop. Herved opnås en bedre styring af den indstrømmende feed når den skifter 5 fra at være en aksialstrømning til at være en radialstrømning, fordi den pludselige retningsændring undgås.Another preferred embodiment is characterized in that the first end wall in the middle has a bead knob projecting towards the inlet pipe. This provides better control of the inflowing feed as it shifts 5 from being an axial flow to a radial flow because the sudden change of direction is avoided.

I en yderligere udførelsesform kan prelknoppen have radiale ribber, der er jævnt fordelt langs prel-knoppens periferi. Dette kan være nødvendigt for at 10 tildele feeden i indløbet en tilstrækkelig rotation til at der opnås en stabil cirkulationsstrømning i indløbet .In a further embodiment, the bead knob may have radial ribs evenly distributed along the bead knob periphery. This may be necessary to give the feed in the inlet sufficient rotation to achieve a stable circulation flow in the inlet.

I andre udførelsesformer kan indløbet være udformet i en udskiftelig del af transportørkroppen, og 15 prelknoppen kan være udskifteligt fastgjort til den første endevæg, og fremspringet, der indeholder den ak-siale boring for indløbsrøret, kan være udskifteligt fastgjort til den anden endevæg. Ved disse foranstaltninger opnås at en og samme dekantercentrifuge kan an-20 vendes til forskellige typer af feed ved, at en eller flere af de nævnte komponenter udskiftes.In other embodiments, the inlet may be formed in a replaceable portion of the conveyor body, and the bead knob may be interchangeably attached to the first end wall and the projection containing the axial bore of the inlet tube may be interchangeably attached to the second end wall. By these measures, it is achieved that one and the same decanter centrifuge can be used for different types of feed by replacing one or more of said components.

I en foretrukket udførelsesform af dekantercen-trifugen ifølge opfindelsen kan indløbsrøret være aksi-alt forskydeligt. Herved opnå, at diameteren af strålen 25 ved prelknoppen kan ændres ved forskydning af indløbsrøret, hvorved der gives mulighed for at afpasse strømningen i indløbet til arten af feeden og/eller gennemstrømningsmængden af denne.In a preferred embodiment of the decanter centrifuge according to the invention, the inlet tube may be axially displaceable. In this way, the diameter of the beam 25 at the bead knob can be changed by displacing the inlet pipe, thereby allowing the flow in the inlet to be adapted to the nature of the feed and / or the flow rate thereof.

Opfindelsen vil nu blive forklaret nærmere ved 30 hjælp af nogle udførelsesformer og med henvisning til tegningen, på hvilken fig. 1 i stærk skematisk form viser en del af en dekantercentrifuge ifølge opfindelsen, fig. 2 en udførelsesform af indløbet i en de-35 kantercentrifuge som i fig. 1, fig. 3 et indløb som i fig. 2, hvor forløbet af strømningen i feeden i indløbet er indikeret, 7 DK 170967 B1 fig. 4 et indløb som i fig. 2, hvor den anden endevægs fremspring har to ribber, der følger skruelinier langs fremspringets periferi, fig. 5 et indløb som i fig. 4, hvor den første 5 endevæg har et ringformet fremspring, og fig. 6 et indløb som i fig. 2, hvor indløbet, prelknoppen og den anden endevægs fremspring er udskifteligt monteret.The invention will now be explained in more detail by means of some embodiments and with reference to the drawing, in which FIG. 1 is a schematic diagram showing a portion of a decanter centrifuge according to the invention; FIG. 2 is an embodiment of the inlet of a disc centrifuge as in FIG. 1, FIG. 3 shows an inlet as in FIG. 2, where the flow of the feed in the inlet is indicated; FIG. 4 shows an inlet as in FIG. 2, wherein the second end wall projection has two ribs that follow helical lines along the periphery of the projection; FIG. 5 shows an inlet as in FIG. 4, wherein the first end wall has an annular projection; and FIG. 6 shows an inlet as in FIG. 2, where the inlet, the knob and the other end wall protrusion are interchangeably mounted.

Den i fig. l viste dekantercentrifuge har en 10 tromle 1, der er lejret roterbart i lejer 22 ved hver ende. I tromlen 1 er en transportør 2 lejret roterbart i forhold til tromlen ved hjælp af lejer 23 ved hver ende. Transportøren 2 omfatter en transportørkrop 3 med en udvendig transportsnegl 21. Trans-15 portørkroppen 3 indeholder et indløb 4, der aksialt begrænses af en første endevæg 11 og en anden endevæg 13. Indløbet 4 begrænses radialt af en med transportørkroppen 3 koaksial væg 5 i hvilken der er indløbsåbninger 6, der forbinder indløbet 4 med det 20 mellem transportørkroppen 3 og tromlen's 1 inderside beliggende rum 7. Dekantercentrifugen har yderligere et indløbs rør 8 med en mod indløbet 4 rettet munding 16.The FIG. 1, a decanter centrifuge has a drum 1 mounted rotatably in bearings 22 at each end. In the drum 1, a conveyor 2 is mounted rotatably relative to the drum by means of bearings 23 at each end. The conveyor 2 comprises a conveyor body 3 with an external conveyor screw 21. The conveyor body 3 contains an inlet 4 axially limited by a first end wall 11 and a second end wall 13. The inlet 4 is radially limited by a coaxial wall 5 in which the conveyor body 3 there are inlet openings 6 connecting the inlet 4 with the space 7 located between the conveyor body 3 and the inside of the drum 1 of the drum 1. The decanter centrifuge further has an inlet pipe 8 with an inlet 16 directed towards the inlet 4.

Fig. 2 viser indløbet 4 med endevæggen 11, 25 der centralt har en mod indløbsrøret fremspringende prelknop 12, der i denne udførelsesform er udformet som en tilnærmelsesvis sfærisk flade, der går jævnt over i endevæggen 11, der selv danner en jævn overgang til den radialt begrænsende væg 5. Den anden endevæg 30 13 har et mod prelknoppen vendende fremspring 14, der indeholder en med tromleakslen koaksial boring 15 for indløbsrøret 8. Fremspringet 14 har form af en keglestub, hvis lilleende vender mod prelknoppen. Ved storenden går fremspringet jævnt over i endevæggen 13, 35 der selv går jævnt over i væggen 5. På fremspringet 14's periferi er placeret seks i hovedsagen radiale, DK 170967 B1 8 svagt skruelinieformede, langsgående ribber 17, der er jævnt fordelt langs fremspringets periferi. Mundingen 16 af indløbsrøret 8 ligger i et plan, der er vinkelret på tromleaksen. Indløbsrøret 8 er aksialt for-5 skydeligt, hvorved afstanden mellem mundingen 16 og prelknoppen 12 kan varieres. Indstillingen af denne afstand kan efter valg foregå under driften, og variationen af afstanden kan foregå manuelt eller automatisk ved hjælp af en ikke-vist styremekanisme.FIG. 2 shows the inlet 4 with the end wall 11, 25 having centrally a bead knob 12 projecting against the inlet pipe, which in this embodiment is formed as an approximately spherical surface which extends smoothly into the end wall 11, which itself forms a smooth transition to the radially limiting wall 5. The second end wall 30 13 has a protrusion-facing projection 14 which contains a coaxial bore 15 with the drum shaft for the inlet pipe 8. The protrusion 14 is in the form of a cone stub whose end face faces the prelab. At the major end, the projection extends smoothly into the end wall 13, 35 which itself extends evenly into the wall 5. On the periphery of the projection 14 are located six generally radial, slightly helical, longitudinal ribs 17 evenly distributed along the periphery of the projection. The orifice 16 of the inlet pipe 8 lies in a plane perpendicular to the drum axis. The inlet tube 8 is axially displaceable, thereby varying the distance between the orifice 16 and the bead 12. The setting of this distance can be selected during operation, and the variation of the distance can be done manually or automatically by means of a control mechanism (not shown).

10 I den radiale væg 5 er der indløbsåbninger 6, der alle er placeret således, at de ligger mellem vindingerne af transportsneglen 21. Yderligere er åbningerne placeret jævnt over hele den aksiale udstrækning af væggen 5. Derved opnås at væsken frit kan strømme 15 fra indløbet gennem indløbsåbningerne ind i rummet 7 uden at passere elementer, som kan frembringe turbulens og hvirvler.10 In the radial wall 5, there are inlet openings 6, all of which are positioned between the turns of the conveyor screw 21. Further, the openings are evenly spaced over the entire axial extension of the wall 5. This allows the liquid to flow freely 15 from the inlet. through the inlet openings into the space 7 without passing through elements which can produce turbulence and swirls.

Fig. 3 tjener til illustration af strømningsforløbet i indløbet. I figurens øverste halvdel er med 20 punkterede linier angivet forskellige karakteristiske strømningsområder, som feeden kommer igennem ved passagen af indløbet. I figurens nederste halvdel er med pile indikeret retningen af feedens ikke-tangentiale hastigheder i indløbet.FIG. 3 serves to illustrate the flow in the inlet. In the upper half of the figure, 20 characteristic lines indicate different characteristic flow areas that the feeder comes through as the passage of the inlet. In the lower half of the figure, arrows indicate the direction of the feed's non-tangential velocities in the inlet.

25 Feedens vej gennem indløbet kan beskrives såle des. Feeden forlader indløbsrøret 8 og fortsætter i en stråle mod prelknoppen 12, hvor den spredes radiært ud mellem prelknoppen og et hvirvelområde 31 beliggende ved den fri væskeoverflade. Feeden fortsætter 30 derefter ud i et opblandingsområde 30, hvor der sker en opblanding med væske fra et radialt ydre område 33 af indløbet, hvorved feedens vinkelhastighed øges. Denne vinkelhastighed er noget mindre end vinkelhastigheden i det tilgrænsende område 33, det såkaldte dissi-35 pationsområde, og feeden vil derfor blive presset tilbage mod væskeoverfladen i retningen mod de radiale 9 DK 170967 B1 ydre kanter af ribberne 17. Da ribberne roterer med samme hastighed som transportørkroppen, tildeles væsken i dette område en vinkelacceleration, der bevirker at væsken ikke trænger længere ind mod fremspringet 14.The path of the feed through the inlet can be described as such. The feed exits the inlet tube 8 and proceeds in a jet toward the bead knob 12 where it is radially spread out between the bead knob and a vortex region 31 located at the free liquid surface. The feeder then proceeds into a mixing region 30 where a mixing of liquid from a radially outer region 33 of the inlet occurs, thereby increasing the angular velocity of the feed. This angular velocity is somewhat less than the angular velocity in the adjacent region 33, the so-called dissipation region, and the feeder will therefore be pushed back against the liquid surface in the direction towards the outer edges of the ribs 17. As the ribs rotate at the same speed like the conveyor body, the fluid in this region is assigned an angular acceleration which causes the fluid to no longer penetrate the projection 14.

5 Ribberne har en svag skruelinieform, der trækker væsken mod endevæggen 13. I dette accelerationsområde 32 opnår feeden samme vinkelhastighed som ribberne, medens overskudsenergien ved denne acceleration findes som en radial hastighed, der bringer feeden ind i dissipa-10 tionsområdet 33 over hele fremspringet 14's længde.The ribs have a weak helical shape which draws the liquid towards the end wall 13. In this acceleration area 32, the feeder achieves the same angular velocity as the ribs, while the excess energy at this acceleration is found as a radial velocity which brings the feeder into the dissipation region 33 over the entire projection 14. length.

I dissipationsområdet 33 omsættes den radiale hastighed via en turbulensstrømning til en temperaturstigning af feeden, og der sker en opblanding således at den høje vinkelhastighed i væsken, der kommer fra 15 ribberne 17, omsættes til en middelvinkelhastighed i væsken, der bevæger sig radialt ud mod området 34 omkring indløbsåbningerne 6. De tre indløbsåbninger 6 er placeret mellem vindingerne, så der ikke er kanter der kan frembringe turbulens eller tilbageholde tråde 20 og lignende større partikler i feeden. Åbningerne er så store, at de ikke udgør nogen restriktion for strømningen, og da de følger vindingerne er de aksielt forskudt i forhold til hinanden, og dækker næsten hele længden af den cirkulærcylindriske væg 5. Ved passage af et af 25 indløbshullerne vil feeden få en lille ekstra acceleration, men denne påvirkning er kun lille, fordi feeden allerede har opnået omtrent samme vinkelhastighed som transportørkroppen på det pågældende sted.In the dissipation region 33, the radial velocity is reacted via a turbulence flow to a temperature rise of the feed, and a mixing occurs so that the high angular velocity of the liquid coming from the ribs 17 is translated to a mean angular velocity of the liquid radially moving towards the region. 34 around the inlet openings 6. The three inlet openings 6 are positioned between the turns so that there are no edges capable of producing turbulence or retaining threads 20 and similar larger particles in the feed. The openings are so large that they do not constitute a restriction on the flow, and as they follow the turns they are axially displaced relative to each other, covering almost the entire length of the circular cylindrical wall 5. Upon passage of one of the 25 inlet holes, the feed will have a a little extra acceleration, but this effect is only small because the feed has already achieved about the same angular velocity as the conveyor body at that location.

I figuren er det vist, at endevæggene 11 og 13 30 går jævnt over i den cirkulærcylindriske væg 5. Dette er ikke en nødvendig forudsætning for at indløbet funktionerer som forklaret ovenfor. Såfremt overgangen mellem endevæggene og den cirkulærcylindriske væg var udformet som et retvinklet hjørne, ville der blot danne 35 sig en stationær strømning i dette hjørne som ikke ville forstyrre de ovenfor omtalte strømninger. I et så- DK 170967 B1 10 dant tilfælde ville der være mulighed for, at der på det pågældende sted blev udfældet sediment fra feeden, hvilket kunne medføre at der efter nogen tids drift måtte foretages en rensning af indløbet. For at undgå 5 dette bør de forskellige flader i indløbet gå jævnt over i hinanden.In the figure, it is shown that the end walls 11 and 13 30 smoothly pass into the circular cylindrical wall 5. This is not a necessary condition for the inlet to function as explained above. If the transition between the end walls and the circular cylindrical wall was designed as a right-angled corner, only a stationary flow would form in this corner which would not interfere with the above-mentioned flows. In such a case, sediment from the feed would be precipitated at the site in question, which could, after some time, have to be cleaned of the inlet. To avoid this, the different surfaces of the inlet should flow evenly.

Det i fig. 4 viste indløb har ribber 17, der er placeret i skruelinieform langs fremspringet 14's omkreds. Sådanne ribber vil fremkalde en kraftigere 10 strømning i accelerationsområdet 32 mod endevæggen 13 end de i fig. 3 viste ribber 17. I denne udførelsesform af indløbet er der seks indløbsåbninger 6, der alle er placeret mellem sneglevindingerne 21.The FIG. 4 has ribs 17 positioned in helical form along the circumference of the projection 14. Such ribs will induce a stronger flow in the acceleration region 32 toward the end wall 13 than those in FIG. 3 in ribs 17. In this embodiment of the inlet, there are six inlet openings 6, all of which are located between the auger windings 21.

Det i fig. 5 viste indløb har en endevæg 11 15 med et ringformet fremspring 20, der på den radialt indvendige og udvendige side af fremspringet går jævnt over i endevæggen 11. Med et sådan fremspring er det muligt at opnå en kraftig styring af strømningsforløbet i indløbet, og ved sammenligning med øverste halvdel af 20 fig· 3 ses det, at fremspringet vil adskille opblandingsområdet fra dissipationsområdet og derved tvinge feeden til at løbe over en længere strækning, hvor den kan dissipere sin energi før den når hen i nærheden af indløbsområdet 34.The FIG. 5 has an end wall 11 15 with an annular protrusion 20 which extends smoothly on the radially inner and outer side of the protrusion 11. With such a protrusion it is possible to obtain a strong control of the flow flow in the inlet, and by In comparison with the upper half of 20 Fig. 3, it is seen that the projection will separate the mixing area from the dissipation area, thereby forcing the feeder to run over a longer distance where it can dissipate its energy before it reaches the inlet region 34.

25 Fig. 6 viser et indløb, der i hovedsagen er ud formet som indløbet i fig. 2, men hvor selve indløbspartiet er udformet som en separat komponent, der er sammenboltet med transportørkroppen 3 via bolte 25 og flanger på transportørkroppen. Prelknoppen 12 er 30 også udformet som en separat komponent, der er fastboltet til endevæggen 11 ved hjælp af en central bolt 26. Fremspringet 14 er ligeledes udført som en separat komponent, der via bolte 27 er fastboltet i endevæggen 13.FIG. 6 shows an inlet substantially shaped like the inlet of FIG. 2, but wherein the inlet portion itself is designed as a separate component which is bolted to the conveyor body 3 via bolts 25 and flanges on the conveyor body. The bell knob 12 is also formed as a separate component which is bolted to the end wall 11 by a central bolt 26. The projection 14 is also designed as a separate component which is bolted to the end wall 13 via bolts 27.

35 Ved tilpasningen af en dekantercentrifuge ifølge opfindelsen til en bestemt driftsform, er der med det 11 DK 170967 B1 beskrevne Indløb store muligheder for at variere størrelsen og faconen af de forskellige indgående elementer med henblik på at opnå optimal ydelse. Indløbets radius kan kun ændres indenfor snævre grænser, men det er mu-5 ligt at forlænge indløbet i aksial retning. Herved skal det overvejes, at en forlængelse af indløbet almindeligvis vil medføre at fremspringet 14 også må forlænges, da det er nødvendigt at kontrollere den indvendige overflade af væsken i indløbet for at sikre, at den ik-10 ke trænger så langt ind mod rotationsaksen, at væsken kan strømme ud gennem boringen 15 i fremspringet.In adapting a decanter centrifuge according to the invention to a particular mode of operation, with the inlet described there is great opportunity to vary the size and shape of the various incoming elements in order to obtain optimum performance. The radius of the inlet can only be changed within narrow limits, but it is possible to extend the inlet in the axial direction. Hereby, it should be considered that an extension of the inlet will generally cause the protrusion 14 to also be extended, since it is necessary to check the internal surface of the liquid in the inlet to ensure that it does not penetrate so far against the axis of rotation. allowing the liquid to flow out through the bore 15 of the projection.

Hvis indløbsåbningerne 6 i et langt indløb fordeles jævnt over væggen 5 er der risiko for at en del af feeden kun vil få en kort vej gennem indløbet før den 15 passerer en indløbsåbning og trænger ud i rummet 7. I et sådant tilfælde kan det være gavnligt at benytte sig af en endevæg 11 med et ringformet fremspring 20 som vist i fig. 5.If the inlet openings 6 in a long inlet are evenly distributed over the wall 5, there is a risk that part of the feeder will only have a short way through the inlet before it passes through an inlet opening and enters the space 7. In such a case it may be beneficial. using an end wall 11 with an annular projection 20 as shown in FIG. 5th

Det er ribberne 17's funktion, over et stort 20 gennemstrømningsområde, at hindre overløb gennem boringen 5, at tilføre feeden vinkelhastighed, og at fordele feeden aksialt over hele indløbet, således at den fra accelerationen stammende overskudsenergi kan dissi-peres over hele indløbets dissipationsområde 33. Den 25 aksiale udstrækning af ribberne 17 skal derfor tilpasses indløbets aksiale længde, dog bør ribberne 17 dække området ud for indløbsåbningerne. Radialt skal ribberne være beliggende på så lille en radius som muligt, under hensyntagen til diameteren af indløbsrøret 30 og dermed af boringen 15, og længden og dermed styrken af fremspringet 14.It is the function of the ribs 17, over a large flow area 20, to prevent overflow through the bore 5, to supply the feeder angular velocity, and to distribute the feeder axially over the entire inlet so that the excess energy arising from the acceleration can be dissipated over the entire dissipation area 33. The axial extension of the ribs 17 must therefore be adapted to the axial length of the inlet, however, the ribs 17 should cover the area next to the inlet openings. Radially, the ribs should be as small as possible, taking into account the diameter of the inlet pipe 30 and thus of the bore 15, and the length and thus the strength of the projection 14.

Den enkelte ribbe kan forløbe helt aksialt, under en konstant vinkel i forhold til rotationsaksen, eller med variabel vinkel i forhold til aksen. Vinklen 35 i forhold til aksen skal sørge for den aksiale fordeling af feeden over dissipationsområdet 33, og må af- DK 170967 B1 12 passes efter gennemstrømningsmængden, typen af den feed der skal separeres og den aksiale udstrækning af ribberne 17 og indløbet 4 som omtalt ovenfor. Ribberne udformes så hår og tråde i feeden ikke sætter sig fast 5 på kanter, men vil blive slynget af. Prelknoppen har til formål at ændre feedens retning, så den bliver ført ind i opblandingsområdet 30 med et minimum af forstyrrelse af feedens fri overflade i indløbet, og således at der opnås en ensartet fordeling over endevæggen 10 11's overflade. Såfremt ribberne 17 på fremspringet 14 ikke kan give den ønskede rotation kan der anbringes ribber på prelknoppen. Disse ribber skal ligeledes være udformet så hår og tråde ikke sætter sig fast.The individual ribs can extend completely axially, at a constant angle to the axis of rotation, or at a variable angle to the axis. The angle 35 with respect to the axis must provide for the axial distribution of the feeder over the dissipation area 33, and must be adjusted according to the flow rate, the type of feed to be separated and the axial extension of the ribs 17 and the inlet 4 as discussed above. . The ribs are shaped so that hair and threads in the feed do not get stuck 5 on edges, but will be thrown off. The bead knob is intended to change the direction of the feed so that it is introduced into the mixing area 30 with a minimum of disturbance of the free surface of the feed in the inlet and so as to obtain a uniform distribution over the surface of the end wall 10 11. If the ribs 17 on the projection 14 cannot provide the desired rotation, ribs can be applied to the bead knob. These ribs must also be designed so that hair and strands do not get stuck.

Som omtalt ovenfor vil feeden idet den passerer 15 gennem indløbsåbningerne 6 til rummet 7 får tildelt en lille acceleration. For at formindske dette accelerationstilskud er det fordelagtigt at godstykkelsen i området ved indløbsåbningerne er så lille som de styrke- og slidmæssige aspekter tillader.As discussed above, as the feed passes 15 through the inlet openings 6 to the space 7, a small acceleration is assigned. To reduce this acceleration allowance, it is advantageous that the thickness of the material in the area at the inlet openings is as small as the strength and wear aspects allow.

20 Da indløbsåbningerne ligger under den fri væ skeoverflade i indløbet, kan der kun ledes meget små mængder luft ud af indløbet af denne vej. Derfor gives fremspringet, som omtalt ovenfor, fordelagtigt form af en keglestub, således at eventuel luft i indløbet kan 25 ledes tilbage langs indløbsrøret.20 Since the inlet openings lie below the free liquid surface in the inlet, only very small amounts of air can be vented out of the inlet of this path. Therefore, as mentioned above, the projection is advantageously given the shape of a cone stub so that any air in the inlet can be directed back along the inlet pipe.

Ved roterende indløbsrør, der er lejret inde i transportørkroppen, bør der være midler til at sikre, at indløbet kan udluftes gennem lejringen. I en sådan dekantercentrifuge er der mulighed for en yderligere 30 forbedring af separeringen, idet der ved udsugning kan skabes et undertryk i indløbet. Et sådant undertryk vil mindske den energi, der skal dissiperes, idet noget af overskudsenergien i dette tilfælde går til at udligne undertrykket.In the case of rotating inlet pipes which are stored inside the conveyor body, means should be provided to ensure that the inlet can be vented through the bearing. In such a decanter centrifuge, there is the possibility of a further improvement of the separation, since suction can create a vacuum in the inlet. Such suppression will reduce the energy to be dissipated, as some of the excess energy in this case will offset the suppression.

Claims (14)

1. Dekantercentrifuge omfattende en roterbart lejret tromle (1) og en i tromlen roterbart lejret transportør (2) med en transportørkrop (3), der indeholder et som et hulrum udformet indløb (4) for feeden, 5 der skal separeres, hvilket indløb (4) radialt er begrænset af en med transportørkroppen koaksial væg (5), der indeholder indløbsåbninger (6), der forbinder indløbet (4) med det mellem transportørkroppen (3) og tromlens (1) inderside beliggende rum (7), og hvor et 10 periferiområde af indløbet (4), begrænset udadtil af radius til indløbsåbningerne (6), er frit for medbrin-gere, indragende fremspring eller lignende, et med tromlen koaksialt indløbsrør (8) for feeden, og ved tromlens ene ende en udløbskant (9) for den frasepare-15 rede væskefase, kendetegnet ved, at indløbsåbningernes (6) mundinger i indløbet (4) er beliggende på en radius, der er større end radius til udløbskanten (9), at indløbet (4) aksialt er begrænset af en overfor indløbsrøret (8) beliggende rotationssymmetrisk første 20 endevæg (11), og en overfor den første endevæg (11) beliggende rotationssymmetrisk anden endevæg (13), der i midten har et mod den første endevæg (11) ragende fremspring (14) med en aksial boring (15) for indløbsrøret (8), og at indløbsrørets (8) munding (16) vender mod 25 indløbet (4) og er beliggende i et plan vinkelret på tromleaksen.A decanter centrifuge comprising a rotatably mounted drum (1) and a drum rotatably mounted in the drum (2) with a conveyor body (3) containing a cavity-shaped inlet (4) for the feed to be separated, which inlet ( 4) is radially limited by a coaxial wall (5) with the conveyor body, containing inlet openings (6) connecting the inlet (4) with the space (7) located between the conveyor body (3) and the inside of the drum (1), 10 peripheral region of the inlet (4), limited externally by the radius of the inlet openings (6), is free of brackets, projecting projections or the like, a coaxial inlet tube (8) for the feeder, and at one end of the drum an outlet edge (9). ) for the separated liquid phase, characterized in that the orifices of the inlet openings (6) in the inlet (4) are located at a radius greater than the radius of the outlet edge (9), that the inlet (4) is axially limited by opposite the inlet pipe (8) a rotationally symmetrical first end wall (11) and a rotationally symmetrical second end wall (13) located opposite the first end wall (13) having a projection (14) projecting against the first end wall (11) with an axial bore (15) for the inlet pipe (8) and that the mouth (16) of the inlet pipe (8) faces the inlet (4) and is located in a plane perpendicular to the drum axis. 2. Dekantercentrifuge ifølge krav 1, kendetegnet ved, at den anden endevægs (13) fremspring (14) har form af en keglestub, hvis spidse ende vender 30 mod den første endevæg (11).Decanter centrifuge according to claim 1, characterized in that the protrusion (14) of the second end wall (13) is in the form of a cone stub whose pointed end faces 30 of the first end wall (11). 3. Dekantercentrifuge ifølge krav 1 eller 2, kendetegnet ved, at den anden endevægs (13) fremspring (14) har en i hovedsagen radial ribbe (17), der følger en skruelinie langs fremspringets periferi.Decanter centrifuge according to claim 1 or 2, characterized in that the projection (14) of the second end wall (13) has a generally radial rib (17) which follows a helical line along the periphery of the projection. 4. Dekantercentrifuge ifølge krav 1 eller 2, kendetegnet ved, at den anden endevægs (13) DK 170967 B1 14 fremspring (14) har flere, i hovedsagen radiale ribber (17), der følger skruelinier langs fremspringets periferi .Decanter centrifuge according to claim 1 or 2, characterized in that the second end wall (13) has several (14) projections (generally radial ribs) which follow helical lines along the periphery of the projection. 5. Dekantercentrifuge ifølge krav 1 eller 2, 5 kendetegnet ved, at den anden endevægs (13) fremspring (14) har i hovedsagen radiale længderibber (17), der er jævnt fordelt langs fremspringets periferi.Decanter centrifuge according to claim 1 or 2, 5, characterized in that the protrusion (14) of the second end wall (13) has substantially radial longitudinal ribs (17) which are evenly distributed along the periphery of the protrusion. 6. Dekantercentrifuge ifølge ethvert af de fo- 10 regåede krav, kendetegnet ved, at den første endevæg (11) i midten har en mod indløbsrøret (8) fremspringende prelknop (12).Decanter centrifuge according to any one of the preceding claims, characterized in that the first end wall (11) in the middle has a bead knob (12) projecting against the inlet pipe (8). 7. Dekantercentrifuge ifølge ethvert af de foregående krav, kendetegnet ved, at prelknoppen 15 (12) har i hovedsagen radiale ribber, der er jævnt for delt langs prelknoppens periferi.Decanter centrifuge according to any one of the preceding claims, characterized in that the bead knob 15 (12) has substantially radial ribs that are evenly spaced along the bead knob periphery. 8. Dekantercentrifuge ifølge krav 7, k ende-tegnet ved, at prelknoppens (12) i hovedsagen radiale ribber følger skruelinier langs prelknoppens 20 periferi.The decanter centrifuge according to claim 7, characterized in that the substantially radial ribs of the bell knob (12) follow helical lines along the periphery of the bell knob 20. 9. Dekantercentrifuge ifølge ethvert af de foregående krav, kendetegnet ved, at den første endevæg (11) har et mod indløbsrøret (8) vendende, ringformet fremspring (20).Decanter centrifuge according to any one of the preceding claims, characterized in that the first end wall (11) has an annular projection (20) facing the inlet tube (8). 10. Dekantercentrifuge ifølge ethvert af de fo regående krav og hvor transportøren (2) omfatter en transportsnegl (21) kendetegnet ved, at hver indløbsåbning (6) er beliggende mellem to hosliggende sneglevindinger (21).Decanter centrifuge according to any of the preceding claims and wherein the conveyor (2) comprises a conveyor screw (21) characterized in that each inlet opening (6) is located between two adjacent auger windings (21). 11. Dekantercentrifuge ifølge ethvert af de fo regående krav, kendetegnet ved, at transportørkroppen (3) omfatter en udskiftelig del (24) i hvilken indløbet (4) er udformet.Decanter centrifuge according to any of the preceding claims, characterized in that the conveyor body (3) comprises a replaceable part (24) in which the inlet (4) is formed. 12. Dekantercentrifuge ifølge krav 6-11, k e n - 35 detegnet ved, at prelknoppen (12) er udskifteligt fastgjort til den første endevæg (11). 15 DK 170967 B1Decanter centrifuge according to claims 6-11, characterized in that the bead knob (12) is interchangeably attached to the first end wall (11). DK 170967 B1 13. Dekantercentrifuge ifølge ethvert af de foregående krav, kendetegnet ved, at fremspringet (14), der indeholder en aksial boring (15) for indløbsrøret (8) er udskifteligt fastgjort til den an- 5 den endevæg (13).Decanter centrifuge according to any of the preceding claims, characterized in that the projection (14) containing an axial bore (15) for the inlet pipe (8) is interchangeably fixed to the other end wall (13). 14. Dekantercentrifuge ifølge ethvert af de foregående krav, kendetegnet ved, at indløbsrøret (8) er aksialt forskydeligt.Decanter centrifuge according to any one of the preceding claims, characterized in that the inlet pipe (8) is axially displaceable.
DK65190A 1990-03-13 1990-03-13 decanter centrifuge DK170967B1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DK65190A DK170967B1 (en) 1990-03-13 1990-03-13 decanter centrifuge
DE69104715T DE69104715T2 (en) 1990-03-13 1991-03-12 DECANTER CENTRIFUGE.
EP91906597A EP0520010B1 (en) 1990-03-13 1991-03-12 Decanter centrifuge
PCT/DK1991/000075 WO1991013686A1 (en) 1990-03-13 1991-03-12 Decanter centrifuge
JP3506758A JP2987519B2 (en) 1990-03-13 1991-03-12 Decanter centrifuge
US08/193,649 US5374234A (en) 1990-03-13 1994-02-07 Decanter centrifuge with energy dissipating inlet

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK65190 1990-03-13
DK65190A DK170967B1 (en) 1990-03-13 1990-03-13 decanter centrifuge

Publications (3)

Publication Number Publication Date
DK65190D0 DK65190D0 (en) 1990-03-13
DK65190A DK65190A (en) 1991-09-14
DK170967B1 true DK170967B1 (en) 1996-04-09

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DK65190A DK170967B1 (en) 1990-03-13 1990-03-13 decanter centrifuge

Country Status (5)

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EP (1) EP0520010B1 (en)
JP (1) JP2987519B2 (en)
DE (1) DE69104715T2 (en)
DK (1) DK170967B1 (en)
WO (1) WO1991013686A1 (en)

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US5354255A (en) * 1992-12-17 1994-10-11 Alfa Laval Separation Inc. Decanter centrifuge with conveyor capable of high speed and higher flow rates
DE19738128A1 (en) * 1997-09-01 1999-03-11 Rolf Dipl Ing Schnause Method and device for centrifuging viscous fluids, in particular viscous plastic melts
US6780147B2 (en) * 2000-08-31 2004-08-24 Varco I/P, Inc. Centrifuge with open conveyor having an accelerating impeller and flow enhancer
US6790169B2 (en) * 2000-08-31 2004-09-14 Varco I/P, Inc. Centrifuge with feed tube adapter
US6561965B1 (en) 2000-10-20 2003-05-13 Alfa Laval Inc. Mist pump for a decanter centrifuge feed chamber
SE525413C2 (en) * 2003-06-18 2005-02-15 Alfa Laval Corp Ab A screw conveyor for a decanter centrifuge
DE102006011452B4 (en) * 2006-03-13 2014-02-13 Flottweg Se Centrifuge with an inlet pipe
KR100977196B1 (en) 2008-09-26 2010-08-23 주식회사 로얄정공 The separating screw decanter centrifuges having double acceleration discharging cover installed in screw conveyer
KR101231066B1 (en) 2012-07-18 2013-02-07 주식회사 천보엔지니어링 Centrifugal dehydrater having distributing room of antiblocking structure
DE102020008152A1 (en) 2020-11-09 2022-06-23 Flottweg Se Centrifuge scroll and solid bowl scroll centrifuge
DE102020129483B3 (en) 2020-11-09 2022-05-25 Flottweg Se Centrifuge scroll and solid bowl scroll centrifuge
IT202100000035A1 (en) * 2021-01-04 2022-07-04 Schlumberger Technology Corp DECANTER CENTRIFUGES AND ACCELERATION PIPES AND ASSOCIATED PROCESSES

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Also Published As

Publication number Publication date
WO1991013686A1 (en) 1991-09-19
JPH05505557A (en) 1993-08-19
DK65190D0 (en) 1990-03-13
EP0520010B1 (en) 1994-10-19
JP2987519B2 (en) 1999-12-06
EP0520010A1 (en) 1992-12-30
DE69104715T2 (en) 1995-05-04
DE69104715D1 (en) 1994-11-24
DK65190A (en) 1991-09-14

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