EP3181231B1 - Couvercle de tambour d'une centrifugeuse à vis à bol plein - Google Patents

Couvercle de tambour d'une centrifugeuse à vis à bol plein Download PDF

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Publication number
EP3181231B1
EP3181231B1 EP16195749.3A EP16195749A EP3181231B1 EP 3181231 B1 EP3181231 B1 EP 3181231B1 EP 16195749 A EP16195749 A EP 16195749A EP 3181231 B1 EP3181231 B1 EP 3181231B1
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EP
European Patent Office
Prior art keywords
drum lid
drum
drum cover
section
lid section
Prior art date
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EP16195749.3A
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German (de)
English (en)
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EP3181231A1 (fr
Inventor
Alfons Kellnberger
Daniel Schroft
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Flottweg SE
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Flottweg SE
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    • 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
    • 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
    • B04B2001/2083—Configuration of liquid outlets

Definitions

  • the invention relates to a drum cover of a drum of a solid bowl centrifuge rotatable about a centrifuge axis, with a first drum cover section in which there are outlet openings at which a clarified medium can flow from inside the drum via a weir edge to the outside of the drum, and a second drum cover section. which, viewed in the axial direction, is on the outside of the first drum cover section and which is designed to support the drum in a rotatable manner, and at least a third drum cover section, via which the first drum cover section is statically connected to the second drum cover section.
  • Solid-bowl screw centrifuges also known as decanters, use a drum that rotates at high speed around a centrifuge axis to separate continuously flowing mixtures of substances.
  • the mixture of substances is separated into at least two phases within the drum, a light phase, usually a clarified medium, floating on a heavy phase, such as particles or sludge, as a so-called pond.
  • the drum is closed at one of its two axial ends with a drum cover.
  • the drum cover has several sections, which are generally designed in one piece or screwed or welded together and in ignore each other.
  • a first drum cover section there are outlet openings at which the clarified medium can flow from inside the drum over a weir edge to the outside of the drum.
  • This first drum cover section is usually designed as a disk which extends in the form of a plate from radially inside to radially outside.
  • a second drum cover section is located in relation to the interior of the drum, viewed in the axial direction on the outside in front of the first drum cover section and supports the drum rotatably there. There is usually a drum bearing on or in this second drum cover section.
  • This third drum cover section is generally designed as a thickening or a thick-walled hollow cylinder, through the interior or interior of which an inlet pipe for the mixture of substances to be clarified or a drive shaft of a screw extends.
  • the outlet opening is normally provided on the outside of the drum with a weir plate which has a weir edge towards the outlet opening. This weir edge at the outlet opening determines or regulates the level or the pond depth of the light phase within the drum.
  • a solid-bowl screw centrifuge with a drum which is rotatably supported at its two ends about its horizontal axis of rotation by means of two drum bearings.
  • the drum At one end the drum is provided with a drum cover, which has several drain openings.
  • a weir plate which serves as an overflow weir and defines an overflow edge on its inner diameter, is connected upstream of the drain openings.
  • a liquid phase of a clarified material emerges from the outlet openings via the overflow edge.
  • a peeling chamber section is attached to the outside of the drum cover, which has a first hollow cylindrical chamber wall which extends along the axis of rotation and which is arranged radially outside the overflow edge.
  • a peeling disc serving as a liquid outlet with a radial channel through which the liquid phase is to be passed from radially outside to radially inside the overflow edge.
  • an axial channel is provided within a second hollow cylindrical chamber wall of the peeling chamber section mounted on the drum bearing, through which the liquid phase is to be guided radially outward within the overflow edge.
  • the invention has for its object to provide a drum cover of a solid bowl centrifuge, in which it is possible to set the outlet openings radially far inward and thus to provide a large pond depth inside the drum.
  • a drum cover of a drum of a solid-bowl screw centrifuge rotatable about a centrifuge axis with a first drum cover section, in which there are outlet openings at which a clarified medium can flow from inside the drum via a weir edge to the outside of the drum, and with a second drum cover section which, viewed in the axial direction, is located outside of or in front of the first drum cover section and which is designed to support the drum in a rotatable manner, and with at least a third drum cover section, via which the first drum cover section is statically connected to the second drum cover section, the at least a third drum cover section, viewed in the radial direction, is located radially on the outside with respect to the weir edge.
  • the at least one third drum cover section viewed in the radial direction, is located radially on the inside with respect to the at least one weir edge there.
  • the weir edge or weir edges is or are located radially outside of this third drum cover section. Cleared medium escaping at the respective weir edge can be drained radially outwards accordingly. This free discharge is basically necessary, because the drum rotates at high speed and the escaping medium is accordingly subject to a high centrifugal force and is therefore immediately thrown radially outwards in relation to the rotating drum cover.
  • the at least one third drum cover section is located radially outside of the weir edge. This is surprising at first because the drum cover section there would actually hinder the outflow of clarified medium. In this regard, however, the invention takes advantage of the fact that the at least one third drum cover section does not extend over the entire circumference of the drum cover, but that there are free spaces radially outside of the weir edges despite the third drum cover section, through which the clarified medium then flows can flow radially outside.
  • the solution according to the invention with its at least one third drum cover section manages to create a supporting effect between the first and the second drum cover section without the radially inner space being required for this by the weir edges.
  • the term "viewed radially outward in the radial direction" used here does not mean that the third drum cover section lies on the same radius or radial jet on the outside of the respective weir edge, but only that it is located on a circular ring which is located radially further out , i.e. has a larger radius than a circular ring radially further inside, on which the respective weir edge is located.
  • the outlet openings can be positioned radially far inwards or close to the centrifuge axis.
  • the fact that the stiffness of the drum cover there is weakened is compensated for by means of the at least one third drum cover section arranged radially on the outside.
  • a comparatively large pond depth can be achieved in the solid-bowl screw centrifuge according to the invention without excessive weakening of the drum cover due to outlet openings positioned radially far inward.
  • the at least one third drum cover section is advantageously positioned and dimensioned such that at the operating speed of the solid-bowl screw centrifuge with the drum cover rotating, the clarified medium can escape from the outlet openings in the circumferential direction and radially outward, without impinging on the at least one third drum cover section.
  • the operating speed for solid bowl centrifuges is generally between 600 and 10,000 rpm (in words: six hundred and ten thousand revolutions per minute). As mentioned, this high operating speed causes the clarified medium to be thrown out of the at least one outlet opening in the circumferential direction of the drum cover and particularly radially outwards.
  • the mentioned further development according to the invention ensures that the clarified medium which is thus flung outwards is not prevented from flowing out.
  • the at least one third drum cover section is also essentially in a circular sector next to the weir edge.
  • a circle sector is a "pie slice" of a circle.
  • a plurality of third drum cover sections are located between the circular sectors of the respective weir edges. If the drum cover sections are located in the circumferential direction next to the weir edges, the associated weir plates can be easily assembled and disassembled from the radial outside. In particular, the circular sectors of the third drum cover section or the third drum cover sections and the circular sectors of the weir edge or weir edges can also partially overlap. The respective third drum cover section can then be made comparatively wide, in particular in the circumferential direction, and thus correspondingly stable or stiff.
  • the number of third drum cover sections is preferably equal to the number of outlet openings.
  • a plurality of third drum cover sections are distributed over the circumference and, in particular, are also arranged successively and as a rule regularly, at equal distances apart.
  • a plurality of third drum cover sections can be spaced irregularly or alternately, in particular in order to achieve a reduction in noise.
  • the number of outlet openings is particularly preferably even or odd between 2 and 10 (in words: two and ten).
  • third drum cover sections and outlet openings With the same number of third drum cover sections and outlet openings, it is possible to provide exactly one third drum cover section at each discharge opening. In this way, not only can a structurally particularly rigid construction in the form of a lattice structure be created, instead, it is also possible for the cleared medium to flow freely between the respective third drum cover sections.
  • the at least one third drum cover section is essentially triangular in cross section.
  • the triangular cross-section of this type prevents the escaping medium from being deposited on the respective third drum cover section.
  • An essentially triangular shape in cross section is also advantageous in order to avoid that outflowing, clarified medium strikes a component of the drum cover. The clarified medium can then always flow off slightly radially to the outside.
  • a tip of the third drum cover section which is triangular in cross section, points in the direction of the centrifuge axis, this tip region of the drum cover section can extend in the radial direction up to close to the centrifuge axis. Comparatively large forces can be supported with the third drum cover sections.
  • Another advantage of this triangular shape of the cross section of the third drum cover section is that there is a comparatively large amount of space or free space between the respective third drum cover sections in order to arrange an outlet opening there and to mount an associated weir plate.
  • the at least one third drum cover section viewed in the axial direction, is advantageously designed to be essentially polygonal, in particular hexagonal, in cross section.
  • This polygonal cross-sectional shape of the third drum cover section results in a comparatively large cross-sectional area for the third drum cover section with a small circumference. With this cross-sectional shape, larger forces can be transmitted with the same outer surface.
  • at least one side surface of the third drum cover section is preferably arranged such that it points in the direction of the centrifuge axis, that is to say largely radially.
  • At least a fourth drum cover section is preferably provided in the drum cover according to the invention, via which the first drum cover section is also statically connected to the second drum cover section.
  • the at least one fourth drum cover section viewed in the radial direction, is located radially on the inside with respect to the respective weir edge.
  • This fourth drum cover section is accordingly viewed in the radial direction on a circular ring between the weir edge and the centrifuge axis. In this way, together with the third drum cover section, it connects the first to the second drum cover section.
  • the first and second drum cover sections are then connected to one another by means of the third and fourth drum cover sections on an “outer” and an “inner” circular ring.
  • the drum cover according to the invention is reinforced or braced accordingly in this area in a “grid-like” manner. This stiffening makes it possible to transmit large forces from the first to the second drum cover section.
  • the fourth drum cover section is particularly preferably designed in cross section as a ring or as a hollow cylinder and in particular in one piece with the first and the second drum cover sections.
  • the weir edge is preferably also formed on a weir plate which, viewed in the axial direction, is attached to the first drum cover section in front of the associated outlet opening.
  • a weir plate which, viewed in the axial direction, is attached to the first drum cover section in front of the associated outlet opening.
  • the weir plate When the weir plate is attached to the first drum cover section, it can seal in a fluid-tight manner at the associated outlet opening.
  • the clarified medium emerging from the outlet opening is correspondingly retained by the weir plate until the desired pond depth or the specified liquid level is reached when the drum is filled with the medium to be clarified and the clarified medium flows away over the weir edge.
  • the weir edge is preferably formed on a channel groove which, viewed in the axial direction, is attached to the first drum cover section after the weir edge in the flow direction of the clarified medium.
  • a channel groove which, viewed in the axial direction, is attached to the first drum cover section after the weir edge in the flow direction of the clarified medium.
  • Such Channel channel can deflect the clarified medium emerging through the outlet opening in the circumferential direction against the direction of rotation of the drum. In this way, the outflow of the clarified medium can be used to support the rotary drive of the drum of the solid bowl centrifuge. The flow diverted in this way results in energy recovery from the flowing, clarified medium. If this channel gutter is positioned radially close to the weir edge, a comparatively large amount of energy can be recovered from the outflowing, clarified medium.
  • the weir edge is also formed on an outflow surface which, viewed in the axial direction, extends from the first drum cover section to the second drum cover section.
  • the outflow surface aligned in this way "largely” connects the first drum cover section to the second drum cover section and thus bridges the distance between the two drum cover sections.
  • the outflow surface also serves as a deflection of the outflowing medium in the circumferential direction.
  • this outflow surface does not have a channel wall, but uses the second drum cover section as a radially oriented boundary surface. A deflection of the outflowing medium in the circumferential direction is also possible without a channel shape. This is particularly advantageous with regard to a possible risk of clogging on the outflow surface.
  • Fig. 1 shows a solid bowl screw centrifuge 10 according to the prior art with a housing 12 and with a drum 14 which is rotatably mounted in particular by means of a bearing arrangement 16.
  • the drum 14 can rotate at high speed about a centrifuge axis 18 which defines an axial direction 20 and a radial direction 22.
  • the drum 14 comprises in the axial direction 20 a conical drum end 24, in which, distributed over the circumference, there are several ejection openings 26.
  • the drum 14 is formed from a circular cylindrical drum body 28 and a plate-shaped drum cover 30.
  • the drum cover 30 is divided into three drum cover sections, a first, disk-shaped drum cover section 32, a second, hollow-cylindrical, thin-walled drum cover section 34 and a third, hollow-cylindrical, thick-walled drum cover section 36.
  • the first, disk-shaped Drum cover section 32 is connected to the drum body 28.
  • the second, hollow cylindrical, thin-walled drum cover section 34 is arranged in the bearing arrangement 16 and is rotatably supported by the bearing arrangement 16.
  • the third, also hollow cylindrical, but thick-walled drum cover section 36 is arranged between the first and second drum cover sections 32, 34 and is integrally connected to them at its two axial ends.
  • drum cover 30 there are also a plurality of outlet openings 38 in the first, disk-shaped drum cover section 32.
  • a weir edge 40 is arranged at each of the outlet openings 38.
  • a screw 42 rotates within the drum 14 at a comparatively low differential speed about the centrifuge axis 18.
  • the screw 42 has a hollow cylindrical screw hub 44 and a screw spiral 46 surrounding it.
  • the worm 42 is rotatably mounted on the drum cover 30 by means of a bearing arrangement 48.
  • a medium 52 to be separated or clarified is to be introduced into the drum 14 through the drum cover 30 and the worm hub 44 by means of a feed pipe 50.
  • the medium 52 to be clarified is subjected to a high centrifugal force by means of the rotation of the drum about the centrifuge axis 18 and is thus separated into several phases. It separates into a first phase or a separated medium 54 and a second phase or a clarified medium 56.
  • the separated medium 54 settles on the inside on the circular cylindrical drum body 28 of the drum 14 and is conveyed axially by means of the screw 42 to the conical drum end 24 and then along it radially inwards and through the ejection openings 26 to the outside.
  • the generally liquid, clarified medium 56 floats on this separated medium 54 and collects as a so-called pond towards the centrifuge axis 18. When a predetermined pond depth or a liquid level 58 is reached, flows the clarified medium 56 off over the weir edges 40 and is discharged away from the centrifuge axis 18, in particular in the radial direction 22.
  • a weir edge 40 is shown on a disk-shaped, radially aligned weir plate 60.
  • FIG. 5 represents a weir edge 40 on a trough-shaped channel groove 62.
  • the Fig. 3 shows the drum cover 30 with its direction of rotation 64 and with six outlet openings 38.
  • the outlet openings 38 are distributed at a distance in the circumferential direction on a ring or circle and extend axially through the drum cover 30.
  • the liquid level 58 is present inside the drum 14 in the axial direction 20 towards the outside up to the radial height of the weir edges 40.
  • the three outlet openings 38 on the left and above in the Fig. 3 are covered with weir plates 60.
  • the clarified medium 56 flows off via these weir plates 60 in three, wide discharge streams 66 curved against the direction of rotation.
  • three channel channels 62 are arranged with respective weir edges 40.
  • the clarified medium 56 flows out in a comparatively narrow drain flow 68 via these channel grooves 62, deflected in the circumferential direction.
  • the channel groove 62 thus deflects the flowing medium 56 in the circumferential direction.
  • the three weir plates 60 and the three channel channels 62 are screwed to the drum cover 30 by means of fastening screws 70.
  • the third drum cover section 36 can be recognized according to the prior art as a thick-walled, hatched ring.
  • Fig. 4 shows one of the weir plates 60 as a flat, thin plate which, with its width extent, completely covers the outlet opening 38 in the circumferential direction and also partially outwards in the radial direction 22.
  • the weir plate 60 thus defines with its weir edge 40 the liquid level 58 of the clarified medium 56 within the drum 14.
  • Fig. 5 shows one of the channel grooves 62 with its four areas 72, 74, 76 and 78 and an outflow surface 80.
  • the channel groove 62 is also attached to the side of the drum cover 30, namely with the first area 72.
  • the second area 74 faces axially directed outwards and acts as a channel bottom.
  • This second region 74 forms an outflow surface 80 and extends essentially in the circumferential direction.
  • the third region 76 points outside from the second region 74 in the radial direction 22 towards the centrifuge axis 18.
  • the fourth region 78 closes the channel groove 62 of this type in the direction of rotation 64.
  • the Fig. 6 shows a part of the solid bowl screw centrifuge 10 according to a first embodiment with the drum cover 30.
  • the drum cover 30 is as in FIG Fig. 1 divided into the first drum cover section 32, the second drum cover section 34, a third drum cover section 82 according to the invention and additionally a fourth drum cover section 84 according to the invention.
  • outlet openings 38 are formed which extend obliquely inwards towards the centrifuge axis 18 and in particular are designed to widen outwards.
  • the third and fourth drum cover sections 82, 84 are arranged between the first and second drum cover sections 32, 34.
  • the third drum cover section 82 extends close to the first drum cover section 32, within a first region 86 which is ring-shaped in cross section and close to that second drum cover section 34, within a disk-shaped, second region 88.
  • the first region 86 adjoins the first drum cover section 32 and is located in the radial direction outside the associated weir edges 40.
  • the first region 86 is interrupted by a plurality of outflow openings 90 from which the clarified medium 56 flows out radially outward through the drum cover 30 can.
  • the second area 88 is plate-shaped and arranged axially next to the weir edges 40 and with respect to the radial direction 22 outside and inside of these. It connects the first area 86 to the second drum cover section 34.
  • mounting holes 92 are provided axially next to the fastening screws 70, through which these fastening screws 70 can be mounted in the axial direction 20.
  • the second region 88 can alternatively also be non-plate-shaped, but rather star-shaped or lattice-shaped by means of spokes or struts, in order to connect the first region 86 to the second drum cover section 34.
  • the fourth, relatively thin-walled, tubular drum cover section 84 connects the first drum cover section 32 to the second region 88 in the radial direction 22 from the inside of the outlet openings 38.
  • the fourth drum cover section 84 can alternatively be designed to be polygonal.
  • the fourth drum cover section 84 thus additionally stiffens the drum cover 30 radially far inside. It also serves to ensure that clarified medium 56 flowing out cannot reach inward in the radial direction 22.
  • outlet openings 38 are provided. At three of these outlet openings 38, which are in Fig. 7 on the left side and above, weir plates 60 with associated discharge streams 66 are shown. At the three remaining outlet openings 38, they are in Fig. 7 On the right side and located below, channel channels 62 with the respective drain streams 68 are shown.
  • the annular shape of the first region 86 is divided into several elements 94 in the circumferential direction by the outflow openings 90.
  • these elements 94 each have a substantially triangular shape, which has a corner facing the centrifuge axis 18. This corner is rounded, while the other two corners of the triangular shape are sharp.
  • the rounding off of the radially inward corner has the advantage that the clarified medium 56 can flow out to the radially outward without swirling.
  • the elements 94 of the first region 86 lie in each case in a circumferential direction essentially next to an adjacent weir edge 40.
  • the number of elements 94 is equal to the number of weir edges 40 or outlet openings 38.
  • the clarified medium 56 flows through the outlet opening 38 over the associated weir edge 40.
  • the clarified medium 56 flows directly radially outward through the outflow opening 90 there between two adjacent elements 94.
  • the clarified medium 56 flows out through an outflow opening 90 adjacent in the circumferential direction due to the deflection in the direction of rotation. The clarified medium 56 thus "skips" one of the elements 94.
  • the 8 and 9 show part of a solid bowl centrifuge 10 according to a second embodiment of the invention.
  • the drum cover 30 is divided into first and second drum cover sections 32 and 34, as well as a third drum cover section 82 according to the invention.
  • the outlet opening 38 with its weir edge 40 is placed even closer to the centrifuge axis 18. This makes it possible for the liquid level 58 in the drum 14 to slide closer to the centrifuge axis 18 or for the pond depth to be greater than in the first exemplary embodiment according to FIG Fig. 6 ,
  • the third drum cover section 82 of this exemplary embodiment likewise comprises an annular, interrupted region 86 on the first drum cover section 32 and a disk-shaped region 88 on the second drum cover section 34.
  • the region 86 is arranged closer to the centrifuge axis 18 in the radial direction 22.
  • the disk of area 88 is correspondingly smaller in diameter.
  • outlet openings 38 with three weir plates 60 with outflow flows 66 at the top left, and three channel channels 62 with outflow flows 68 at the bottom right are shown.
  • the weir plates 60 and the channel channels 62 are screwed by means of fastening screws 70 in the radial direction 22 outside of the outlet openings 38.
  • the first region 86 is formed in the radial direction 22 outside the outlet openings 38.
  • the first region 86 is subdivided into a plurality of elements 94, which are arranged in the circumferential direction on a concentric ring around the centrifuge axis 18.
  • the elements 94 essentially lie on circular sectors next to an adjacent weir edge 40 and the number of elements 94 is equal to the number of outlet openings 38.
  • the elements 94 according to Fig. 9 each have a hexagonal shape in cross section. Two of the side faces of this hexagonal shape point in the direction of the centrifuge axis 18.
  • the hexagonal shape has, as in the section according to Fig. 9 is clearly recognizable, a larger cross-sectional area than that in Fig. 7 shown triangular shape.
  • the first region 86 has moved further radially inward in this exemplary embodiment. These two circumstances make it possible for this area 86 to transmit higher forces than in the exemplary embodiment according to FIG 6 and 7 ,
  • This geometrical shape of the elements 94 is in accordance with FIG Fig. 9 and their arrangement is particularly advantageous.
  • Fig. 10 shows a channel groove 62 for the drum cover section 82 according to the invention.
  • this channel groove 62 has only three areas 72, 74 and 78.
  • the third area 76 is replaced here by the inner wall of the second area 88 of the third drum cover section 82 facing the outlet opening 38.
  • the first three areas 72, 74 and 78 are largely the same as in the embodiment according to FIG Fig. 5 ,
  • the difference in this channel groove 62 is that the second and fourth regions 74, 78 extend with the outflow surface 80 in the axial direction 20 away from the outlet opening 38 to the second region 88 of the third drum cover section 82.
  • the second area 88 thus takes over the function of deflecting the emerging, clarified medium in the circumferential direction.
  • Fig. 11 in contrast shows the installation situation with a classic or conventional weir plate 60 in the drum cover 30 according to the invention.
  • the element 94 has a pentagonal shape in cross section.
  • the element 94 is adapted to the direction of rotation 64 and designed depending on the direction of rotation.
  • the design of the element 94 is based on the outer edges of the courses of the outflow stream 66 and the outflow stream 68 facing the element 94.
  • the element 94 fills precisely that space in which the outflow streams 66 and 68 cannot be located. The result of this is that both outflow streams 66 and 68 are to be discharged without resistance and turbulence.
  • both discharge streams 66 and 68 are also shown at a single outlet opening 38.
  • the pentagonal shape depending on the direction of rotation, as in the section according to Fig. 12 has a larger cross-sectional area than that shown in Fig. 7 shown triangular shape as well as in Fig. 9 illustrated hexagonal shape. Because of this larger cross-sectional area, higher forces can be transmitted than in the exemplary embodiments according to 6 to 9 , Particularly in the case of torsional stress, this is essentially pentagonal in shape according to elements 94 Fig. 12 and their arrangement is particularly advantageous.
  • Fig. 13 shows a further embodiment of the element 94 according to Fig. 12 ,
  • the corners of the essentially pentagonal shape in cross section, which point towards the centrifuge axis 18, are rounded. Rounding the corners of the element 94 enables the element 94 to be adapted even more closely to the arc shape of the discharge streams 66 and 68.
  • the cross-sectional area of the element 94 according to Fig. 13 is compared to element 94 Fig. 12 further enlarged.

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  • Centrifugal Separators (AREA)

Claims (10)

  1. Couvercle de tambour (30) d'une centrifugeuse à vis sans fin à paroi pleine (10) mobile en rotation autour d'un axe de centrifugeuse (18), comportant
    - une première portion de couvercle de tambour (32) dans laquelle se situent des ouvertures de sortie (38) par lesquelles un milieu clarifié (56) peut s'écouler depuis l'intérieur du tambour (14) vers l'extérieur du tambour (14) en passant par une arête de barrage respective (40),
    - une seconde portion de couvercle de tambour (34) qui se trouve à l'extérieur de la première portion de couvercle de tambour (32), vue en direction axiale (20), et qui est conçue de manière à soutenir en rotation le tambour (14), et
    - au moins une troisième portion de couvercle de tambour par laquelle la première portion de couvercle de tambour (32) est reliée statiquement à la seconde portion de couvercle de tambour (34),
    ladite au moins une troisième portion de couvercle de tambour (82 ; 86 ; 94) se trouve radialement à l'extérieur par rapport aux arêtes de barrage (40), vue en direction radiale (22),
    caractérisé en ce que
    à cet endroit, radialement à l'extérieur des arêtes de barrage (40), des espaces libres subsistent malgré la troisième portion de couvercle de tambour (82 ; 86 ; 94), à travers lesquels le milieu clarifié peut alors s'écouler radialement vers l'extérieur.
  2. Couvercle de tambour selon la revendication 1,
    caractérisé en ce que
    ladite au moins une troisième portion de couvercle de tambour (82 ; 86 ; 94) est positionnée et dimensionnée de telle sorte qu'à une vitesse de rotation de fonctionnement de la centrifugeuse à vis sans fin à paroi pleine (10), le couvercle de tambour (30) étant en rotation, le milieu clarifié (56) peut sortir hors des ouvertures de sortie (38) en direction périphérique et radialement vers l'extérieur, sans tomber sur ladite au moins une troisième portion de couvercle de tambour (82 ; 86 ; 94).
  3. Couvercle de tambour selon la revendication 1 ou 2,
    caractérisé en ce que
    ladite au moins une troisième portion de couvercle de tambour (82 ; 86 ; 94) se trouve à côté de l'arête de barrage (40), vue en direction périphérique.
  4. Couvercle de tambour selon l'une des revendications 1 à 3,
    caractérisé en ce que
    le nombre de troisièmes portions de couvercle de tambour (82 ; 86 ; 94) est égal au nombre d'ouvertures de sortie (38).
  5. Couvercle de tambour selon l'une des revendications 1 à 4,
    caractérisé en ce que
    ladite au moins une troisième portion de couvercle de tambour (82 ; 86 ; 94) est conçue en section transversale sensiblement en forme triangulaire, vue en direction axiale (20).
  6. Couvercle de tambour selon l'une des revendications 1 à 4,
    caractérisé en ce que
    ladite au moins une troisième portion de couvercle de tambour (82 ; 86 ; 94) est conçue en section transversale sensiblement en forme hexagonale, vue en direction axiale (20).
  7. Couvercle de tambour selon l'une des revendications 1 à 6,
    caractérisé en ce que
    il est prévu au moins une quatrième portion de couvercle de tambour (84) par laquelle la première portion de couvercle de tambour (32) est également reliée statiquement à la seconde portion de couvercle de tambour (34), ladite au moins une quatrième portion de couvercle de tambour (84) se situant radialement à l'intérieur par rapport à l'arête de barrage respective (40), vue en direction radiale (22).
  8. Couvercle de tambour selon l'une des revendications 1 à 7,
    caractérisé en ce que
    l'arête de barrage (40) est réalisée sur une plaque de barrage (60) qui est montée en avant de l'ouverture de sortie associée (38) sur la première portion de couvercle de tambour (32), vue en direction axiale (20).
  9. Couvercle de tambour selon l'une des revendications 1 à 7,
    caractérisé en ce que
    l'arête de barrage (40) est réalisée sur une goulotte formant canal (62) qui est montée en avant de l'ouverture de sortie associée (38) sur la première portion de couvercle de tambour (32), vue en direction axiale (20).
  10. Couvercle de tambour selon l'une des revendications 1 à 6,
    caractérisé en ce que
    l'arête de barrage (40) est réalisée sur une surface d'évacuation (80) qui s'étend depuis la première portion de couvercle de tambour (32) jusqu'à la troisième portion de couvercle de tambour (82), vue en direction axiale (20).
EP16195749.3A 2015-12-16 2016-10-26 Couvercle de tambour d'une centrifugeuse à vis à bol plein Active EP3181231B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015122006.7A DE102015122006A1 (de) 2015-12-16 2015-12-16 Trommeldeckel einer Vollmantelschneckenzentrifuge

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EP3181231A1 EP3181231A1 (fr) 2017-06-21
EP3181231B1 true EP3181231B1 (fr) 2020-01-29

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DE (1) DE102015122006A1 (fr)
DK (1) DK3181231T3 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002098567A1 (fr) 2001-05-30 2002-12-12 Alfa Laval, Inc. Centrifugeuse de decantation a boite de vitesses montee sur la cuve
DE102010020901A1 (de) 2010-05-18 2011-11-24 Gea Mechanical Equipment Gmbh Vollmantel-Schneckenzentrifuge
DE102012004548A1 (de) 2012-03-10 2013-09-12 Flottweg Se Trommelzentrifuge mit einer Einlauf-Beschleunigungseinrichtung und einer Auslauf-Bremseinrichtung
US20140038806A1 (en) 2010-11-12 2014-02-06 Alfa Laval Corporate Ab Centrifugal separator, wear resistance member and set of wear resistance members for a centrifugal separator
DE102014108722A1 (de) 2014-04-30 2015-11-05 Hiller Gmbh Schneckenzentrifuge

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002098567A1 (fr) 2001-05-30 2002-12-12 Alfa Laval, Inc. Centrifugeuse de decantation a boite de vitesses montee sur la cuve
DE102010020901A1 (de) 2010-05-18 2011-11-24 Gea Mechanical Equipment Gmbh Vollmantel-Schneckenzentrifuge
US20140038806A1 (en) 2010-11-12 2014-02-06 Alfa Laval Corporate Ab Centrifugal separator, wear resistance member and set of wear resistance members for a centrifugal separator
DE102012004548A1 (de) 2012-03-10 2013-09-12 Flottweg Se Trommelzentrifuge mit einer Einlauf-Beschleunigungseinrichtung und einer Auslauf-Bremseinrichtung
DE102014108722A1 (de) 2014-04-30 2015-11-05 Hiller Gmbh Schneckenzentrifuge

Also Published As

Publication number Publication date
DK3181231T3 (da) 2020-04-14
DE102015122006A1 (de) 2017-06-22
EP3181231A1 (fr) 2017-06-21

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