EP1337344A1 - Essoreuse a vis sans fin, a bol plein, munie d'un distributeur - Google Patents

Essoreuse a vis sans fin, a bol plein, munie d'un distributeur

Info

Publication number
EP1337344A1
EP1337344A1 EP01996435A EP01996435A EP1337344A1 EP 1337344 A1 EP1337344 A1 EP 1337344A1 EP 01996435 A EP01996435 A EP 01996435A EP 01996435 A EP01996435 A EP 01996435A EP 1337344 A1 EP1337344 A1 EP 1337344A1
Authority
EP
European Patent Office
Prior art keywords
distributor
voumantel
wall
screw centrifuge
centrifuge according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP01996435A
Other languages
German (de)
English (en)
Other versions
EP1337344B1 (fr
Inventor
Jürgen HERMELER
Paul BRÜNING
Ludger HORSTKÖTTER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GEA Mechanical Equipment GmbH
Original Assignee
Westfalia Separator Industry GmbH
Westfalia Separator GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE10120995A external-priority patent/DE10120995A1/de
Application filed by Westfalia Separator Industry GmbH, Westfalia Separator GmbH filed Critical Westfalia Separator Industry GmbH
Publication of EP1337344A1 publication Critical patent/EP1337344A1/fr
Application granted granted Critical
Publication of EP1337344B1 publication Critical patent/EP1337344B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/20—Centrifuges 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
    • 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
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/20—Centrifuges 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
    • B04B2001/2033—Centrifuges 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

Definitions

  • the invention relates to a solid-bowl screw centrifuge, which has the following: a rotating drum which encloses a centrifugal space with a screw which also rotates and one which is preferably designed as a tube
  • Distributor for introducing centrifugal material into the centrifugal space, which is oriented at an angle, in particular perpendicular, to the central axis of the screw, the centrifugal material being guided into the distributor through an axially extending feed pipe.
  • the centrifuged material In solid-bowl screw centrifuges, the centrifuged material should be accelerated to the peripheral speed of the screw at the diameter of the liquid level (surface) in the screw channel.
  • the relative speed when entering the centrifugal chamber (liquid surface) should be as low as possible.
  • At least one wall of the distributor is provided with a surface structure made of protrusions in such a way that the major part of the centrifugal material flowing through the distributor on this at least one wall over the essentially radial and / or essentially in the direction of the centrifugal force extending from Inlet pipe in the centrifugal space must flow around at least one of the projections.
  • At least one wall of the distributor is provided with a surface structure comprising at least two or more rows of projections which are offset radially to one another, the projections of the rows being offset axially to one another in such a way that essentially no radial free flow channels are formed on the wall are.
  • the projections are designed as circular, diamond-shaped or other n-shaped knobs in cross section.
  • the projections have a meander shape. In this case, as well as in other versions, it is advantageous if the projections are designed as sheets.
  • At least one wall of the distributor is provided with a step-like surface structure which extends in the circumferential direction and which also brakes, among other things.
  • Figure 1 is a sectional view of a solid bowl screw centrifuge.
  • Fig. 2 shows the inlet area of a distributor in a centrifugal space
  • Fig. 3 is a schematic representation of a section through the drum of Fig. 1;
  • Fig. 5-11 different structures of projections on walls of distributors;
  • Fig. 12 is a diagram illustrating the speeds of the
  • FIG. 1 shows a solid-bowl screw centrifuge with a screw 1, which has a screw body 3 and, in this case, a spiral surrounding the screw body 3
  • a screw channel 7 for conveying / transporting a centrifugal material to be processed is formed between the screw flights x, x + 1, ...
  • the screw body 3 has a cylindrical section 9 in its rear area in FIG. 1 and a section 11 which tapers in steps (alternatively: conically) in its front area adjoining this in FIG. 1.
  • Centrifuged material S is fed through the centrally arranged inlet pipe 13 into a distributor 15 and from there through radial openings 17 in the distributor 15 into the centrifugal space
  • the centrifuged material S is accelerated.
  • the action of the centrifugal force causes the solid particles to settle on the drum wall in a very short time.
  • the screw 1 rotates at a slightly lower or greater speed than the drum 21 and conveys the ejected solid F to the tapered section 11 from the drum 21 to the solids discharge 23.
  • the liquid L flows to the larger drum diameter at the rear end of the drum 21 and is drained there (overflow 25).
  • FIG. 2 again shows the inlet pipe 13, which projects into the distributor 15, which here has an essentially rectangular cross section (perpendicular to the image plane of FIG. 2) or is essentially designed as a rectangular pipe.
  • Cross-sectional geometries deviating from a rectangular cross-section can also be realized.
  • the centrifugal material S entering the distributor 15 moves at the moment of exit from the inlet pipe 13 with the axial flow velocity in the inlet pipe 13. When it enters the distributor 15, it is then carried along by the distributor 15. The centrifuged material S thus rotates with the distributor 15 and
  • the centrifuged material has the absolute speed x (see FIG. 3) with which it is the distributor 15
  • the speed vector x has both
  • the relative speed v can contain a component in the radial direction as well as other components in other directions (e.g. axial).
  • the relative speed component v should be as small as possible when the material to be centrifuged enters the centrifugal space 19, for example in the case of products which are relatively prone to foam formation or have sensitive structures which are not as in the state of the art
  • the centrifuged material S should ideally only enter the centrifugal chamber at the circumferential rotational speed of the screw body 3 and without a relative speed v (see also FIG. 12).
  • a relative speed v see also FIG. 12
  • distributor 15 Take distributor 15 with them - or in addition to provide the side walls 15b (or alternatively all walls) of the distributor which are perpendicular thereto, with a surface structure which consists, in particular, of walls formed directly on wall 15a, d or of at least one separate one that can be attached to the wall
  • [0 sheet 29 can be formed projections 27.
  • a multilayer arrangement comprising a plurality of sheets 29 lying one above the other with projections 27 can also be realized (FIG. 3).
  • the projections 27 are distributed on the at least one wall 15a of the distributor 15 such that at least the major part of the centrifugal material S entering the distributor 15 flows around at least one, but preferably several, of the projections 27 on the radial path outwards got to.
  • the at least one wall 15a is also preferably essentially of the same type with the projections to ensure a sufficient “braking effect”
  • the projections 27 are preferably distributed over an area of 30 to 70% of the at least one wall 25 15a of the distributor 15.
  • the projections 27 are preferably also formed at least in the radially outer region of the distributor wall 15a, d. This has the following advantage.
  • the acceleration of the centrifugal material is greater in the outer radial area of the distributor 15 than in the inner area, so that in the outer radial area of the divider 15a, the braking effect of the projections 27 counteracts this acceleration particularly advantageously.
  • the projections 27 are preferably also formed up to the outer radial edge of the distributor 15 or up to the discharge opening 17 on the wall 15a of the distributor 27.
  • the radially inner part of the distributor (for example the inner 30 or 50% of the wall surface of the wall 15a), on the other hand, can be designed to be smooth, ie without protrusion, without the "braking effect" being significantly reduced.
  • a variant of the invention has also proven to be particularly advantageous in which at least one or more wall (s) 15a, d of the distributor or the plate 29 with the projections 27 placed on the wall 15a extends radially beyond the edge of the opening 17 into the centrifugal chamber.
  • the projections 27 are designed as cylindrical knobs 27a, b - preferably of different diameters - which are fastened in bores 31 of the wall 15a, e.g. are welded.
  • the projections 27 can also widen or taper away from the wall 15a. Spherical shapes are also conceivable.
  • the extension of the projections 27 perpendicular to the distributor wall 15a is selected such that in the preferred application (for example fruit juice extraction etc.) and with the maximum throughput of centrifuged material, the projections 27 are at least as high as the liquid level on the wall 15a.
  • the projections are preferably approximately twice as high as the average liquid level.
  • the projections can alternatively also be designed as rods which pass through the distributor 15 from the wall 15a to the opposite wall 15d.
  • the knobs 27 can also be formed as stampings or in another way can be formed directly in one piece with the wall 15a, d or the sheet 29. This one-piece formation can also be carried out in the casting process or by milling out the knob structure from a correspondingly thick wall panel. '
  • an inner radial region of the wall 15a is designed without protrusions or nubs.
  • This inner radial region is adjoined by a central radial region with four rows of knobs 27a aligned parallel to the drum axis A, each of which has a first diameter a.
  • the knobs 27a, b are each arranged in rows which are aligned parallel to the drum axis A.
  • the rows are axially offset from one another by half the distance between two adjacent knobs 27a, b in such a way that the centrifuged material S is prevented from flowing directly in the radial direction.
  • the axial distance d between the knobs 27a, b is somewhat larger than the diameter of the knobs 27a, b.
  • the distance between the centers of the knobs in the radial direction corresponds approximately to their diameter a, b.
  • the knobs 27 have a diameter that gradually decreases radially outwards.
  • the flow channels 33 are also smaller or narrower. This design causes an increasing braking of the centrifugal material radially from the inside out, that is, it acts on the increasing Acceleration due to the increasing centrifugal force.
  • the distance to be covered for the centrifuged material S becomes longer by the knobs 27a, b.
  • the rows of knobs 27a are each offset from one another by the diameter of the knobs, the distance between the center points or central axes of the cylindrical knobs 27a in each row corresponding to the diameter d of the knobs 27a.
  • FIGS. 4a to 4d The axial misalignment of the rows of knobs relative to one another is reduced from FIGS. 4a to 4d.
  • a direction oblique to the drum axis A there are obliquely outwardly narrowing throughflow channels 33.
  • These can also be avoided entirely if the diameter of the knobs 27a, b as in FIG. 2 or the offset of the rows of knobs varies from row to row or is further reduced (see Fig. 4e).
  • a wide variety of flow characteristics can be achieved through a suitable design of the rows of knobs.
  • knobs are produced using pot cutters.
  • materials such as steel, cast iron or even plastics are conceivable for the knobs.
  • Plastic has the advantage that the knobs are slightly flexible or movable, which can increase the braking effect.
  • FIG. 4e shows a variant in which the knobs of a row are so closely spaced from one another that when the rows of knobs are axially offset by half the distance between two adjacent knobs, no linear flow channels 33 extending perpendicular to the central axis A of the centrifuge remain.
  • the Norsprünge are diamond-shaped.
  • the connecting lines of the tips of the diamonds 227 are perpendicular and parallel to the central axis A of the
  • the tips of the diamonds 227 also point towards each other in the various rows of diamonds, with flow channels 33 between the diamonds 227 in oblique remain in a straight or inclined direction to the central axis.
  • the flow channels 33 or diamonds 227 can be produced, for example, by a milling process.
  • 6a shows a variant of the invention, in which at least two rows of sheet metal strips 127 are attached to the wall 15a of the distributor instead of rows of knobs.
  • sheet metal strips 127 are each oriented at an angle to the central axis A of the centrifuge and are so close to one another in mutually opposite rows of angular displacement that in turn there are no flow channels in the radial direction on the
  • the angle is approximately 30 °. The smaller the angle to the central axis, the higher the speed must be so that no deposits form on the metal strip. The angle could also decrease towards the outside, possibly up to the value 0.
  • the sheet metal strips 127 could also not be perpendicular to the screw body, but could be of any angle (see FIG. 6b) and / or L-shaped or U-shaped or T-shaped and / or arranged (see FIGS. 6c and 6d by way of example). In places with high speed the angle to the central axis should be larger than at
  • a variant is shown in FIG. 7.
  • a first very flat plate 127 leads to strong braking in a labyrinth arrangement 128 made of further, bent plates 127, which is designed such that again no radial flow is possible.
  • the projections have a kind of meander shape.
  • the zigzag-like meanders 327 intermesh in such a way that again no flow channels remain radially outward in the distributor 15.
  • step construction 427) a type of step-like surface structure (step construction 427) has been implemented in the distributor 15 or on the walls 15a of the distributor shaft. Both in Fig. 9 and in Fig. 10, the liquid flow must "Steps" flow in the circumferential direction. The effect is again optimal if the step construction extends into the liquid level.
  • the step contour is made from several sheets 428, alternatively 5 the contour can also be formed from a workpiece (e.g. milled).
  • the sheets 428 have an angled cross-section, i.e. they each consist of a section 428a which runs essentially parallel to the distributor wall and a section 428b which is angled in relation thereto and which here has an example of an inclination of [0 approx. 30 ° to the vertical on the distributor wall.
  • the section 428a of the first plate 428 which runs essentially parallel to the distributor wall, is placed directly on the distributor wall.
  • the sections of the following sheets 428 running parallel to the distributor wall 428a are respectively L5 attached to the rear sides of the angled sections 428b of the preceding sheets, so that a kind of swirl space is created between the successive sheets 428.
  • This arrangement has the following advantages.
  • liquid jet strikes from one step or a plate 428 to the next step or the next plate 428, it is directed (in FIG. 9 to the left and right) in the direction of flow and counter to this in different directions and swirled, which in turn has a braking effect causes.
  • the braking effect is composed here, as it were, of the effect of the oblique sections of the metal sheets 428 and the shadow effect of the intermingling (arrow P2).
  • Fig. 10 differs from Fig. 9 not only in that the step construction 427 was realized in one piece from a cast or milled part, but in that the step construction is designed in such a way that the section 429a of the steps 429, which runs essentially parallel to the distributor wall, is in each case joins the ends of the angled portions 429b of the previous stage so that there is no swirl space between the successive stages.
  • FIG. 11 An alternative to FIGS. 9 and 10 is shown in FIG. 11.
  • a type of “waterfall brake inflow is realized.
  • a type of step contour 427 is realized, but here the individual steps 430 are again formed by rows of projections 431 running essentially parallel to the drum axis, or rows of grooves 432 are milled into a plate.
  • the rows of grooves 432 in turn have an angled cross-section, ie they each consist of a section 432a which runs essentially parallel to the distributor wall and an angled section 432b which, for example, has an inclination of approximately 30 ° to the vertical on the distributor wall.
  • the sections 432a of the rows of grooves which are essentially parallel to the distributor wall are essentially flush with one another, ie they lie in one plane, which makes the manufacture cheaper compared to the variant in FIG. 10 (less waste during milling or less casting material required). It is advantageous in the example shown here that the oblique section 432b has an angle of approximately 30 ° to the vertical on the distributor wall and that the liquid jet also strikes the next step at an angle of, for example, 30 °. LIST OF REFERENCE NUMBERS
  • Diameter knobs a, b,

Landscapes

  • Centrifugal Separators (AREA)

Abstract

L'invention concerne une essoreuse à vis à bol plein, comprenant une zone d'essorage (19) présentant une vis sans fin (1) entraînée en rotation et un tambour (21) également entraîné en rotation, entourant la zone d'essorage (19), ainsi qu'un distributeur (15), de préférence en forme générale de tuyau, pour l'introduction de la matière à essorer (S) dans la zone d'essorage (19), qui est orienté incliné, en particulier verticalement, par rapport à l'axe (A) de la vis (1). La matière à essorer est introduite dans le distributeur (15) par un conduit d'amenée (13) s'étendant axialement. Au moins une paroi (15a) du distributeur présente une structure en surface munie de saillies (27), de telle façon que la majeure partie de la matière à essorer (S) traversant le distributeur soit contrainte de circuler sur au moins ladite paroi (15a), sur le trajet radial allant du conduit d'amenée (13) vers la zone d'essorage (19), en contournant au moins l'une des saillies (27).
EP01996435A 2000-11-14 2001-10-09 Essoreuse a vis sans fin, a bol plein, munie d'un distributeur Expired - Lifetime EP1337344B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE10065893 2000-11-14
DE10065893 2000-11-14
DE10120995A DE10120995A1 (de) 2000-11-14 2001-04-28 Vollmantel-Schneckenzentrifuge mit Verteiler
DE10120995 2001-04-28
PCT/EP2001/011663 WO2002040175A1 (fr) 2000-11-14 2001-10-09 Essoreuse a vis sans fin, a bol plein, munie d'un distributeur

Publications (2)

Publication Number Publication Date
EP1337344A1 true EP1337344A1 (fr) 2003-08-27
EP1337344B1 EP1337344B1 (fr) 2005-12-28

Family

ID=26008134

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01996435A Expired - Lifetime EP1337344B1 (fr) 2000-11-14 2001-10-09 Essoreuse a vis sans fin, a bol plein, munie d'un distributeur

Country Status (6)

Country Link
US (1) US7060019B2 (fr)
EP (1) EP1337344B1 (fr)
JP (1) JP4113775B2 (fr)
DE (1) DE50108585D1 (fr)
DK (1) DK1337344T3 (fr)
WO (1) WO2002040175A1 (fr)

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US7018326B2 (en) * 2000-08-31 2006-03-28 Varco I/P, Inc. Centrifuge with impellers and beach feed
WO2002040175A1 (fr) * 2000-11-14 2002-05-23 Westfalia Separator Industry Gmbh Essoreuse a vis sans fin, a bol plein, munie d'un distributeur
DK175539B1 (da) * 2002-03-14 2004-11-29 Alfa Laval Copenhagen As Dekantercentrifuge med slidforstærkning i indlöb
US20050245381A1 (en) * 2004-04-30 2005-11-03 National-Oilwell, L.P. Centrifuge accelerator system
CA2505236C (fr) * 2005-04-25 2007-11-20 Edward Carl Lantz Centrifugeuse avec faconnage de la chambre d'alimentation reduisant l'usure
DE102005025784A1 (de) * 2005-06-04 2006-12-07 Hiller Gmbh Schneckenzentrifuge
DK200970026A (en) * 2009-06-12 2010-12-13 Alfa Laval Corp Ab A centrifugal separator
DK3106230T3 (da) * 2015-06-19 2020-04-14 Andritz Sas Dekantercentrifuge

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Also Published As

Publication number Publication date
WO2002040175A1 (fr) 2002-05-23
DK1337344T3 (da) 2006-05-15
JP4113775B2 (ja) 2008-07-09
EP1337344B1 (fr) 2005-12-28
DE50108585D1 (de) 2006-02-02
JP2004524136A (ja) 2004-08-12
US7060019B2 (en) 2006-06-13
US20040029697A1 (en) 2004-02-12

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