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EP1693112A1 - Tambour de centrifugeuse, centrifugeuse et procédé de fabrication - Google Patents

Tambour de centrifugeuse, centrifugeuse et procédé de fabrication Download PDF

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Publication number
EP1693112A1
EP1693112A1 EP05003507A EP05003507A EP1693112A1 EP 1693112 A1 EP1693112 A1 EP 1693112A1 EP 05003507 A EP05003507 A EP 05003507A EP 05003507 A EP05003507 A EP 05003507A EP 1693112 A1 EP1693112 A1 EP 1693112A1
Authority
EP
European Patent Office
Prior art keywords
openings
drum
centrifuge
shell
drum shell
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
EP05003507A
Other languages
German (de)
English (en)
Other versions
EP1693112B1 (fr
Inventor
Eckhard Bartsch
Hans-Heinrich Westendarp
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.)
BMA Braunschweigische Maschinenbauanstalt AG
Original Assignee
BMA Braunschweigische Maschinenbauanstalt AG
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
Application filed by BMA Braunschweigische Maschinenbauanstalt AG filed Critical BMA Braunschweigische Maschinenbauanstalt AG
Priority to EP05003507A priority Critical patent/EP1693112B1/fr
Priority to DE502005003446T priority patent/DE502005003446D1/de
Priority to US11/350,790 priority patent/US7335302B2/en
Priority to BRPI0602129-8A priority patent/BRPI0602129B1/pt
Priority to CNB2006100086169A priority patent/CN100522378C/zh
Publication of EP1693112A1 publication Critical patent/EP1693112A1/fr
Application granted granted Critical
Publication of EP1693112B1 publication Critical patent/EP1693112B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B7/00—Elements of centrifuges
    • B04B7/08—Rotary bowls
    • B04B7/18—Rotary bowls formed or coated with sieving or filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B3/00—Centrifuges with rotary bowls in which solid particles or bodies become separated by centrifugal force and simultaneous sifting or filtering

Definitions

  • the invention relates to a centrifuge drum with a drum shell, on the inside of a working screen for separating suspension liquid is arranged.
  • the drum shell has openings which are formed elliptical.
  • the invention relates to a centrifuge with such a drum shell and a method for producing a centrifuge drum.
  • a periodically operating centrifuge for centrifuging the filling compound in which a working screen is arranged on the inner wall of the centrifugal drum.
  • the drain holes in the middle part of the drum shell are elliptical, and the axis of the foci of the ellipse is at right angles to the drum axis.
  • the object of the present invention is to provide a centrifuge drum and a method for the production thereof, with which a separation of suspension liquid is optimized, in particular in order to improve a separation of solid and liquid in crystal suspensions.
  • this object is achieved in that the openings are introduced by an abrasive process in the drum shell and arranged offset to each other in the axial direction and in the circumferential direction of the drum shell, so that overlap the contours of the openings in the axial direction of the drum shell and the drum circumference is covered with openings ,
  • the openings are arranged in the drum shell so that the contours of the openings overlap and form quasi a circumferential slot due to their staggered arrangement. This makes it possible to achieve a very large opening ratio and to allow very short flow paths of the suspension liquid.
  • due to the special arrangement of the openings it is not possible for the suspension liquid separated by the working screen to run along the drum jacket inner wall without encountering an opening.
  • the elliptical shape of the opening which is elongate in the circumferential direction and preferably represents an ellipse in the geometrical sense, enables a reduction of the stresses in the region of the openings and an optimal utilization of the material characteristics.
  • the elliptical openings cause a uniform distribution of stress within the drum shell, with the highest axial stresses occurring at the apex between the foci of the ellipse. Due to the staggered arrangement of the openings, this can be arranged very close to each other, so that the drum shell can have a maximum opening ratio with a maximum of many openings. In hitherto made of sheets drums an aperture ratio of only 4% is economically possible. By the drum according to the invention, an opening ratio of up to 20% can be produced economically.
  • a further development of the invention provides that the contours of the openings overlap in a range of 5% to 30% of their area, e.g. have a coverage of 10% to ensure that separated suspension fluid does not pass between the ports.
  • the main axis of the elliptical openings is preferably at an angle of 35 ° to 135 ° to the drum axis, preferably at an angle of 90 ° to the drum axis, since due to the high speeds a predominantly in Axial direction running flow of the suspension liquid takes place.
  • a development of the invention provides that the openings are arranged in the circumferential direction one behind the other as an opening row. Between the openings, the necessary spaces are available.
  • An axially offset row of openings is arranged so that it is twisted around the axis of the drum so that the contour of the openings cover the spaces between them and over the intermediate spaces survive, so seen in the axial direction, two portions of the openings are behind each other.
  • the rows of openings are arranged in groups, in particular in pairs, three to four pairs of rows are preferably formed in a drum shell, so that it is possible to separate the processes according to their purity. It is provided that the distances between the rows of openings are smaller than or equal to the distances between the groups or pairs rows, so that the separated suspension liquid can be discharged according to their purity. The further in the direction of the centrifuge drum edge the group is arranged, the purer is the separated suspension liquid. It is also provided that the degree of overlapping of the openings is different in a paired arrangement from pair row to pair row, for example, that there is less overlap immediately after the suspension inlet in the lower region of the drum than at the centrifuge drum edge. Alternatively, a larger overlap and thus a larger opening ratio can be provided in the lower area in order to separate the accumulating syrup as quickly as possible. Due to the low mechanical stress in the lower part of the drum, very large degrees of overlap can be achieved.
  • the drum shell is suitably frusto-conical, with the centrifuge drum opening conically.
  • the material thickness of the drum shell is preferably 3 mm to 25 mm, in particular 5 mm, whereby a very lightweight design of the drum shell and the entire centrifuge drum can be achieved.
  • a development of the invention provides that the openings have an axial ratio of 1: 3 to 1:10, wherein the shorter axis is aligned in the axial direction.
  • the horizontal distance between two openings is about 2/3 of the length of the longer, horizontal axis of the openings, wherein the distance of the longer, horizontal axes of two rows of openings in the axial direction to each other about 2/3 of the length of the horizontal axis of the opening.
  • the openings are introduced in a water-jet abrasive separation process.
  • similarly low-stress separation process can be used to form the elliptical openings, such as erosion.
  • the inventive method for producing a centrifuge drum provides that the openings are introduced by an abrasive separation process in the material of the drum shell, either the openings are introduced into the material prior to assembly of the individual parts of the drum shell or only after the drum shell assembled into a truncated cone has been.
  • the introduction of the openings before the joining has the advantage that usually flat workpieces are processed, which brings advantages in handling the workpieces and alignment of the tools with it. If the openings are made in the already finished truncated cone, these can sometimes be better aligned with each other.
  • the figures show a continuously operating centrifuge drum 1 with a conically upwardly opening drum shell 2, on the inside of which a sieve 3 is arranged and whose upper end forms a drum ring 7.
  • the screen 3 can be designed as a working screen with a support screen or as a slotted screen; it is important that a drain of the suspension liquid can take place along the drum inner wall, so that the crystals slide on the wire 3 to the edge of the drum, while the separated suspension liquid can be discharged from the drum 1.
  • elliptical openings 5 are arranged, in the illustrated embodiment of Figure 1 in three pairs, according to Figure 2 in five pairs.
  • the openings 5 are arranged one behind the other in the circumferential direction of the drum shell 2, so that the main axes of the elliptical openings 5, ie the axis on which the focal points of the ellipse lie, lie on a circumference and forms a first row of openings 15. Between the openings 5 spaces 6 are provided.
  • the gaps 6 can be dimensioned differently in the axial direction of the drum shell 2, so that the pitch of the openings 5 changes. The closer the openings 5 are together, the higher the aperture ratio and thus the liquid discharge, the farther the openings 5 are apart, the lower the aperture ratio and thus the liquid discharge.
  • openings 5 Placed in the axial direction are on another circumference also openings 5 and form a second row of openings 25, wherein the openings are rotated to the first row of openings 15 such that the openings 5 cover the gaps 6. It can also be seen that the openings 5 overlap each other at different circumferences, so that two opening regions are arranged axially one behind the other.
  • the rows of openings 15, 25 form a group. There are several groups arranged in the axial direction along the drum shell 2, wherein the distance between the groups greater than or equal to the distance between the Rows 15, 25 is. As a result, a fractionated separation of the suspension liquid can take place.
  • the separated suspension liquid which is thrown by the working screen 3 on the drum shell 2, moves on the drum shell 2 due to the conical formation upwards.
  • the flow path is substantially linear, so that it is ensured due to the arrangement of the openings 5 that separated suspension liquid is discharged in any case through the openings 5 through the drum shell 2.
  • the main axes of the openings 5 are formed at right angles to the axis of the centrifuge drum 1 in the present embodiment, but may also be arranged offset at an angle of 35 ° to 135 ° to the axis 4.
  • the openings 5 are introduced by an abrasive method, in particular with a water jet in the drum wall, which prevents embrittlement of the edge regions of the openings 5, since no microstructural changes takes place by massive heat input. Therefore, thin-walled materials for the drum shell 2 can be used.
  • the drum shell 2 may be made of sheet metal or Cast exist.
  • the centrifuge drum 1 according to the invention makes it possible to separate solids from liquids in an energy-saving manner.
  • a feature here is that due to the high achievable centrifugal forces the separated liquid is passed as quickly as possible from the centrifuge drum 1, whereby the performance of the overall centrifuge is further increased, since less liquid must be accelerated.
  • This is in particular also possible because the openings 5 can be arranged very close to each other and close to the drum base due to the low stresses, compared with square oblong holes and so a large opening ratio is achieved. Accordingly, the accelerated suspension preferably exits from the centrifuge drum 1 in the lower region and no longer has to be accelerated further.
  • Such a centrifuge drum 1 is provided in particular for continuous centrifuges, 25 zones forming by the arrangement of several, superimposed rows of openings, at the upper limits of which an exact outflow of the separated liquid from the centrifuge drum 1 takes place. This offers the possibility of separating the liquid drains from the centrifuge drum 1 according to their purity.
  • An embodiment of the invention provides that the horizontal extent of the ellipse is between 44 mm and 60 mm, with a height of 12 mm, so that the half-axis ratio is between 1: 3 and 1:10.
  • the horizontal extent of approximately 60 mm of an opening 5 the distance between two openings 5 in the horizontal direction is approximately 40 mm, and the distance of the horizontal axes in the axial direction from each other is also approximately 40 mm.
  • the openings 5 can be arranged closer to one another than in the case of angular openings.

Landscapes

  • Centrifugal Separators (AREA)
EP05003507A 2005-02-18 2005-02-18 Tambour de centrifugeuse, centrifugeuse et procédé de fabrication Expired - Lifetime EP1693112B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP05003507A EP1693112B1 (fr) 2005-02-18 2005-02-18 Tambour de centrifugeuse, centrifugeuse et procédé de fabrication
DE502005003446T DE502005003446D1 (de) 2005-02-18 2005-02-18 Zentrifugentrommel sowie Zentrifuge und Verfahren zu deren Herstellung
US11/350,790 US7335302B2 (en) 2005-02-18 2006-02-10 Centrifuge basket and centrifuge
BRPI0602129-8A BRPI0602129B1 (pt) 2005-02-18 2006-02-15 Tambor de centrífuga, bem como, centrífuga
CNB2006100086169A CN100522378C (zh) 2005-02-18 2006-02-20 离心器滚筒以及离心器

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05003507A EP1693112B1 (fr) 2005-02-18 2005-02-18 Tambour de centrifugeuse, centrifugeuse et procédé de fabrication

Publications (2)

Publication Number Publication Date
EP1693112A1 true EP1693112A1 (fr) 2006-08-23
EP1693112B1 EP1693112B1 (fr) 2008-03-26

Family

ID=34933818

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05003507A Expired - Lifetime EP1693112B1 (fr) 2005-02-18 2005-02-18 Tambour de centrifugeuse, centrifugeuse et procédé de fabrication

Country Status (5)

Country Link
US (1) US7335302B2 (fr)
EP (1) EP1693112B1 (fr)
CN (1) CN100522378C (fr)
BR (1) BRPI0602129B1 (fr)
DE (1) DE502005003446D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9463475B2 (en) 2011-11-24 2016-10-11 Bma Braunschweigische Maschinenbauanstalt Ag Discontinuous centrifuge with a rotatable centrifuge drum with a casing and method for producing the casing
DE102018007790A1 (de) 2017-10-16 2019-04-18 Andritz Fiedler Gmbh Diskontinuierlich betriebene Zentrifuge

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8192634B2 (en) 2009-07-13 2012-06-05 Gilles Stephen R Centrifugal basket assembly with segmented dam and method
DE102011119265B4 (de) * 2011-11-24 2018-01-04 Bma Braunschweigische Maschinenbauanstalt Ag Diskontinuierliche Zentrifuge mit Ausräumer zum Ausräumen eines Produktes
US20220252987A1 (en) * 2019-08-01 2022-08-11 Toyobo Co., Ltd. Device for recycling developer, method for recycling developer, and apparatus for developing
WO2022259261A1 (fr) * 2021-06-07 2022-12-15 Phadnis Centrifuge And Balancing Panier centrifuge pour séparation de la mélasse du sucre
DE102023135184A1 (de) 2023-12-14 2025-06-18 Andritz Fiedler Gmbh Diskontinuierlich arbeitende zentrifuge und verfahren zur herstellung einer zentrifugentrommel hierfür

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE120671C (fr) *
DE1916280B1 (de) * 1969-03-29 1970-06-04 Buckau Wolf Maschf R Periodisch arbeitende Zentrifuge zum Abschleudern von Fuellmasse

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3662947A (en) * 1970-03-27 1972-05-16 Kurt Pause Centrifuge drum with discharge openings
US5378364A (en) * 1992-09-14 1995-01-03 Baker Hughes Incorporated Conical screen basket centrifuge

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE120671C (fr) *
DE1916280B1 (de) * 1969-03-29 1970-06-04 Buckau Wolf Maschf R Periodisch arbeitende Zentrifuge zum Abschleudern von Fuellmasse

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9463475B2 (en) 2011-11-24 2016-10-11 Bma Braunschweigische Maschinenbauanstalt Ag Discontinuous centrifuge with a rotatable centrifuge drum with a casing and method for producing the casing
DE102018007790A1 (de) 2017-10-16 2019-04-18 Andritz Fiedler Gmbh Diskontinuierlich betriebene Zentrifuge

Also Published As

Publication number Publication date
BRPI0602129A (pt) 2007-07-17
US7335302B2 (en) 2008-02-26
US20060207926A1 (en) 2006-09-21
CN100522378C (zh) 2009-08-05
BRPI0602129B1 (pt) 2024-04-30
EP1693112B1 (fr) 2008-03-26
DE502005003446D1 (de) 2008-05-08
CN1820856A (zh) 2006-08-23

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