EP0067894B1 - Séparateur centrifuge - Google Patents

Séparateur centrifuge Download PDF

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Publication number
EP0067894B1
EP0067894B1 EP19810104729 EP81104729A EP0067894B1 EP 0067894 B1 EP0067894 B1 EP 0067894B1 EP 19810104729 EP19810104729 EP 19810104729 EP 81104729 A EP81104729 A EP 81104729A EP 0067894 B1 EP0067894 B1 EP 0067894B1
Authority
EP
European Patent Office
Prior art keywords
separating
air
rotor
separating rotor
housing
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.)
Expired
Application number
EP19810104729
Other languages
German (de)
English (en)
Other versions
EP0067894A1 (fr
Inventor
Ulrich Barthelmess
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.)
Omya GmbH
Original Assignee
Omya 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
Application filed by Omya GmbH filed Critical Omya GmbH
Priority to EP19810104729 priority Critical patent/EP0067894B1/fr
Publication of EP0067894A1 publication Critical patent/EP0067894A1/fr
Application granted granted Critical
Publication of EP0067894B1 publication Critical patent/EP0067894B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
    • B07B11/02—Arrangement of air or material conditioning accessories
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
    • B07B11/06—Feeding or discharging arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
    • B07B7/083—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by rotating vanes, discs, drums, or brushes

Definitions

  • the invention relates to a centrifugal classifier according to the preamble of patent claim 1.
  • Such a classifier is used for classifying, i.e. for separating a mixture or batch of grains of different sizes and / or shapes and / or different specific weights in coarse material or coarse grain (grain size above a certain limit grain diameter) and in fine material (grain size below the limit grain size).
  • the grain mixture to be sifted is entered from above into the viewing area (annular space between the guide vane ring and the viewing rotor); At the same time, visible air flows from the outside through the guide vane ring into the visible space, so that the visible air describes a spiral movement and entrains the particles in the corresponding movement paths. In the viewing area, the particles are exposed to the radially directed, opposing resistance and centrifugal forces. For a certain radial and axial air speed, there is a limit grain size for which the two forces are equal.
  • the coarser particles sooner or later reach the coarse grain outlet at the lower end of the viewing area.
  • the fine grain is entrained by the classifying air, which flows in through the channels of the classifying wheel and is sucked off by a fine material classifying air outlet which axially adjoins the interior of the classifying wheel.
  • the fine grain is finally separated or separated from the classifying air, whereupon the classifying air is re-introduced into the classifying air inlet, that is to say it can be circulated.
  • Such classifiers are primarily used to obtain fine material with the smallest possible grain size in a narrow grain size distribution; An upper grain size (limit grain size) of 2 to 4 ⁇ m is desired. This very fine grain is needed in many ways, e.g. as a filler for plastics and car tires.
  • the coarse grain is used for other purposes, or fine material is removed again after a further grinding process.
  • the throughput is relatively low.
  • the throughput depends, among other things, on the size of the classifier, in particular on the length and diameter of the classifying rotor, that is to say its peripheral surface on which the classifying takes place.
  • the diameter is limited due to the increasing centrifugal force, and the limiting grain size also depends on the diameter and the speed, and thus on the centrifugal force.
  • the length of the classifying rotor is also limited, in particular because of different radial flow velocities along the classifying rotor between two fins. This radial flow velocity is dependent on the suction, ie the negative pressure with which suction is drawn off at the outlet. This suction is greatest at the outlet and decreases towards the opposite end.
  • the invention has for its object to provide a classifier of this type with a much higher throughput, and Gret-tzkom- ⁇ sizes preferably between 10 microns down to 2 microns. This object is achieved by the features of the characterizing part of claim 1.
  • the two fine material class air outlets allow a far longer class wheel than before and therefore a correspondingly higher throughput.
  • the large length of the classifying rotor gives a correspondingly long zone of relatively even, stable flow, which is not disturbed by irregularities at the ends of the classifying rotor, and thus a correspondingly effective, uniform classifying.
  • the outlet cross-section is approximately doubled, so that despite the increased throughput there is a lower flow rate.
  • the fine material is thrown against the walls so violently that it adheres there, especially once a first fine material layer has built up. As a result, the flow conditions deteriorate continuously, which also results in a reduction in throughput.
  • such a setting of fine material is prevented in that the two fine material classifying air outlets are each surrounded by a cooling chamber in the area near the rotor.
  • the bearings of the double-sided rotor shaft are advantageously arranged in a cooling chamber; the bearings are cooled at the same time, which benefits operational safety and a long service life of the machine. This is particularly important given the increased throughput.
  • a further embodiment consists in that a labyrinth seal is provided at each end of the classifying rotor, which is connected to one of the cooling air chambers by a channel.
  • the cooling air thus serves at the same time for flushing the labyrinth seals, so that the labyrinth seals are cooled, and there is also no special flushing air Source required.
  • a rinsed labyrinth seal in a classifier is already known from DE-AS 1 757 582.
  • annular channel is provided on the end face of the housing opposite the coarse material outlet for blowing the batch of material to be sifted into the viewing space. In this way, an increased throughput is evenly given up.
  • the classifier has a concentric, essentially cylindrical housing 1 with a tangential classifying air inlet 2, into which the classifying air enters uniformly in the direction of arrows 20 over the entire axial height.
  • a guide vane ring 9 is provided in the housing at a radial distance from the housing jacket. Again at a radial distance from the guide vane ring 9, the lamella ring 11 of the classifying rotor 10 is provided.
  • the grain mixture to be separated is entered from above into the viewing space 23 between the guide vane ring 9 and the rotor disk ring 11.
  • an annular channel 22 for blowing in the grain mixture is provided in the upper housing wall, into which a connecting piece 7 serving as an inlet for coarse grain opens.
  • a funnel-shaped coarse-grain outlet 8 is provided on the opposite, ie lower, front side of the housing.
  • a fine material classifying air outlet 3, 4 is provided in the form of a curved tube piece, the diameter of which corresponds approximately to the rotor inside diameter.
  • the sifting air fine material outlets 3, 4 are each surrounded by a cooling air chamber 17, 18, to which cooling air is supplied in each case via a connection 19, as a result of which fine material is prevented from being deposited in the outlets.
  • the rotor shaft 10a which is guided through the curved outlets 3, 4, is also supported on both sides in bearing brackets 5, 6.
  • the bearings are also cooled. Due to an overpressure in the cooling air chambers 17, 18, no fine material can penetrate them (see arrows on the shaft bushings). It is driven by means of a V-belt pulley 12.
  • the classifying rotor 10 is opened on both end faces 13, 14 in such a way that it connects tightly to the outlets 3, 4. Between the classifying rotor and the housing there is in each case a seal 15, 16 which is designed like a face plate or a labyrinth.
  • a purge air channel 27 in each case introduces purge air from the cooling air chambers 17, 18 for sealing between the viewing space 23 and the outlets 3, 4 (arrow 19 in FIG. 3).
  • support disks 24 provided with radial through openings are shrunk on.
  • the rotor ends are each surrounded by a deflector ring 25, 26 on their outer circumference.

Landscapes

  • Combined Means For Separation Of Solids (AREA)

Claims (5)

1. Séparateur à force centrifuge comprenant un carter sensiblement cylindrique, disposé verticalement et muni d'une entrée (2) sensiblement tangentielle pour l'air de séparation, dans lequel sont disposée à une certaine distance radiale de l'enveloppe du carter et concentriquement à cette dernière une couronne d'aubes directrices (9) fixée au carter et un rotor séparateur (10) situé à une certaine distance radiale de cette dernière vers l'intérieur, et comprenant une couronne de lamelles (11) formant des canaux radiaux, une entrée (7) pour la quantité de grains débouchant par le haut dans l'enceinte séparatrice (23) constituée entre la couronne d'aubes directrices (9) et le rotor séparateur (10) et une sortie (8) pour les grains grossiers sortant par le bas de ladite enceinte séparatrice, et une sortie (3 ou 4) destinée à l'air séparateur chargé de produits fins étant raccordées au rotor séparateur (10) sur ses côtés frontaux, dont le diamètre correspond sensiblement au diamètre interne du rotor séparateur (8), et l'entrée (2) de l'air séparateur et la couronne d'aubes directrices (9) s'étendant sensiblement sur la même longueur axiale que le rotor séparateur, caractérisé en ce que des sorties d'air séparateur de produit fin (3, 4) sont respectivement raccordées aux deux côtés frontaux du rotor séparateur (10), en ce que le rapport diamètre- longueur du rotor séparateur est compris entre 1:1,5 et 1:4 et en ce que des disques d'appui (24) munis d'ouvertures de passage axiales sont frettés sur l'arbre (10a) pour maintenir les lamelles (11) du rotor séparateur (10).
2. Séparateur selon la revendication 1, caractérisé en ce que les deux sorties (3, 4) d'air séparateur de produits fins sont entourées chacune dans la région proche du rotor par une chambre respective d'air de refroidissement (17, 18).
3. Séparateur selon la revendication 2, caractérisé en ce que les paliers (5, 6) de l'arbre (10a) du rotor séparateur qui sont montés sur les deux côtés sont disposés chacun dans l'une des chambres d'air de refroidissement (17, 18).
4. Séparateur selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'à chacune des extrémités frontales du rotor séparateur sont prévues des garnitures à labyrinthe (15, 16) qui sont chacune en liaison par un canal respectif (27) avec l'une des chambres d'air de refroidissement respectives (17, 18).
5. Séparateur selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'il est prévu sur le côté frontal du carter qui est à l'opposé de la sortie (8) des matières grossières un canal annulaire (22) pour souffler la quantité de produits à séparer dans l'enceinte de séparation (23).
EP19810104729 1981-06-19 1981-06-19 Séparateur centrifuge Expired EP0067894B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19810104729 EP0067894B1 (fr) 1981-06-19 1981-06-19 Séparateur centrifuge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19810104729 EP0067894B1 (fr) 1981-06-19 1981-06-19 Séparateur centrifuge

Publications (2)

Publication Number Publication Date
EP0067894A1 EP0067894A1 (fr) 1982-12-29
EP0067894B1 true EP0067894B1 (fr) 1986-04-09

Family

ID=8187777

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810104729 Expired EP0067894B1 (fr) 1981-06-19 1981-06-19 Séparateur centrifuge

Country Status (1)

Country Link
EP (1) EP0067894B1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8401009D0 (en) * 1984-01-14 1984-02-15 Northern Eng Ind Classifier
DE3515026C1 (de) * 1985-04-25 1986-09-18 Fa. Christian Pfeiffer, 4720 Beckum Drehluft-Schleuderkorb-Sichter

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1607631A1 (de) * 1967-07-27 1970-10-22 Krupp Gmbh Windsichter
DE1757582C2 (de) * 1968-05-20 1976-03-11 The Georgia Marble Co., Atlanta, .Ga. (V.St.A.) Schleuderkorb-Windsichter
DE1918573A1 (de) * 1969-04-11 1970-10-15 Polysius Ag Verfahren und Vorrichtung zur Kuehlung des Sichtgutes eines Windsichters
DE2649382A1 (de) * 1976-10-29 1978-05-11 Alpine Ag Zentrifugalwindsichter
US4296864A (en) * 1979-07-17 1981-10-27 Onoda Cement Co., Ltd. Air classifier

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Publication number Publication date
EP0067894A1 (fr) 1982-12-29

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