EP0788842A1 - Separateur - Google Patents

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Publication number
EP0788842A1
EP0788842A1 EP96927960A EP96927960A EP0788842A1 EP 0788842 A1 EP0788842 A1 EP 0788842A1 EP 96927960 A EP96927960 A EP 96927960A EP 96927960 A EP96927960 A EP 96927960A EP 0788842 A1 EP0788842 A1 EP 0788842A1
Authority
EP
European Patent Office
Prior art keywords
disks
housing
pipe
small
particles
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.)
Withdrawn
Application number
EP96927960A
Other languages
German (de)
English (en)
Other versions
EP0788842A4 (fr
Inventor
Anatoly Feodorovich Eremin
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.)
YALESTOWN Corp NV
Original Assignee
YALESTOWN Corp NV
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 YALESTOWN Corp NV filed Critical YALESTOWN Corp NV
Publication of EP0788842A1 publication Critical patent/EP0788842A1/fr
Publication of EP0788842A4 publication Critical patent/EP0788842A4/fr
Withdrawn legal-status Critical Current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
    • 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 present invention relates to a technique for separation of materials into fractions, and more particularly to centrifugal-air classifiers which have a separating device unitizing the principle of counter action of two forces, a centrifugal force and a force of entraining by a gas flow (Stox force).
  • a classifier is known (U.S. patent no. 4,560,471) which has a housing with a rotor located inside the housing and carrying a row of disks for producing a twisted movement of a powder-gas mixture, from which during passage through the so-called ⁇ separation zone ⁇ formed by edges of the disks, a large fraction is ejected while a small fraction is entrained by a gas flow into a space between the disks and then is withdrawn through an outlet of a small fraction.
  • the disadvantage of this device is a limited size of the separation zone, which results in an increased content of particles of the small fraction in the large fraction.
  • a classifier is also known (Inventors Certificate of the USSR No. 154868) which has a housing and a rotor located in the housing and having disks which are fixedly mounted on it and arranged coaxially, a pipe for introduction of an air-dispersed mixture, pipes for withdrawal of large and small fractions, wherein a first disk in direction of movement is provided with beaters for crushing of aggregates.
  • the device when used for separation of mixture of powders with particle sizes less than 120 ⁇ m has the disadvantage that it possesses a low efficiency of separation of the small fraction, and a great quantity of the small fraction remains in the large fraction which needs several additional cleaning steps. This is caused both by a strong aggregation of small particles into their own aggregates as well as by sticking of them onto large particles in an initial material, while the insufficient efficiency of the dispersing beaters does not provide crushing of these aggregates as well as cleaning of the surface of large particles from small particles during the separation process. This leads to the presence of a great quantity of small particles in the large fraction, which makes necessary a repeated (4-5 times) cleaning of the large fraction and thereby reduces the total efficiency of the classification process.
  • a device which is the closest to the proposed invention has a housing with a pipe for a material supply and pipes for withdrawal of small and large fractions, disks located in the housing and coaxially mounted on a rotor arranged in supports of the housing, and blades located between the second and third disks in the movement direction.
  • the disadvantage of this technical solution is its low efficiency which is caused by the reason disclosed in the description of the previous technical solution and by inefficient shape of the blades.
  • a classifier which has a housing with a pipe for a material supply and pipes for withdrawal of small and larger fractions, disks located in the housing and mounted in housing supports with blades mounted coaxially on the rotor and located between second and a third disk in direction of movement of material.
  • An end of the first disk in the direction of movement, which faces a pipe for a material supply has slots, and the above mentioned blades in a cross-section which is parallel to the disks are formed trapezoidal.
  • the above mentioned slots can be formed as radial slots.
  • the proposed classifier includes a housing 1, a rotor 2 located inside the housing and having disks 3, 4, 5 fixedly mounted on it, a pipe 6 for introduction of a material to be separated and a carrying gas, pipes 7 and 8 for withdrawal of large and small fractions.
  • the pipe 7 for withdrawal of the large fraction communicates with a space between the disks 3 and 4, and the pipe 8 for withdrawal of the small fraction communicates with a space between the disks 4 and 5.
  • Slots 9 are formed on the outer end surface of the disk 3, and blades 10 are located between the disks 4 and 5.
  • the disks are fixedly connected with one another by a brace 11.
  • the classifier operates in the following manner.
  • a rotation from a drive (not shown in Fig. 1) with a regulated rotary speed is transmitted to the rotor 2 with the disks 3, 4, 5 mounted on it.
  • a dispersed material is supplied through the pipe 6 with a transporting gas and enters a gap between the wall of the housing 1 and the outer end surface of the disk 3.
  • formation of air vorteces which turbulize the gas flow in the above mentioned gap occurs in areas adjoining the slots 9.
  • the rotating air medium in this gap twists the supplied air-dispersed mixture so as to simultaneously destroy the aggregates.
  • the material passes this zone, it is dispersed to a maximum degree and enters a zone of separation formed by the radial edges of the disks 3 and 4, where it is separated into the large and small fractions.
  • Large particles are thrown into the pipe 7, while small particles are carried by the gas flow through the axial opening in the disk 4 into a space between the disks 4 and 5, from which they are carried out into the pipe 8.
  • the blades 10 create a ventilation pressure in addition to a rarefaction formed outside of the pipe 8 for evacuation of the particles from the apparatus.
  • the formation of vorteces near the slots of the disk 3 in the rotating flow of air dispersed mixture leads to an intense destruction of aggregates of the particles and ⁇ peeling ⁇ of small particles from the surface of the large particles, or in other words a principle of vortex comminution is realized.
  • the intensity of action of the vortex comminution in this devices depends on the rotary speed of the rotor.
  • the intensity of action will increase with the increase of the rotary speed of the rotor and will reduce with its reduction. For example during separation of sufficiently large particles with the separation size 40-50 ⁇ m when the rotary speed of the rotor is small (1500-1000 rev/min) and the particles have sufficient mass and kinetic energy themselves which allows crushing of the aggregates, the influence of the vortex action is insignificant.
  • the presence of the zone of vortex dispersion of the aggregates provides for a possibility of increasing the efficiency of separation of the small fraction from the large fraction, and guarantees a higher quality separation into the fractions for the powders with initial sizes less than 10 ⁇ m.
  • the invention provides for a possibility of reduction of the number of cleaning steps of large fraction, as a result, wear of elements of classifier., which enhances the increase of its efficiency and reliability.
  • the invention can be used in various technologies which provide utilization of powder materials with a given granulometry.
  • the most promising is its use in the manufacture of grinding powders, ceramics, special cements, conductive pastes in microelectronics, carriers for pigments, etc.

Landscapes

  • Combined Means For Separation Of Solids (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
EP19960927960 1996-08-08 1996-08-08 Separateur Withdrawn EP0788842A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
RU96114874 1996-08-08
PCT/RU1996/000212 WO1996035521A1 (fr) 1996-08-08 1996-08-08 Separateur
RU9696114874A RU2094135C1 (ru) 1996-08-08 1996-08-08 Классификатор

Publications (2)

Publication Number Publication Date
EP0788842A1 true EP0788842A1 (fr) 1997-08-13
EP0788842A4 EP0788842A4 (fr) 1997-08-29

Family

ID=20183713

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19960927960 Withdrawn EP0788842A4 (fr) 1996-08-08 1996-08-08 Separateur

Country Status (6)

Country Link
EP (1) EP0788842A4 (fr)
JP (1) JP2002515819A (fr)
KR (1) KR19980701206A (fr)
AU (1) AU6759096A (fr)
RU (1) RU2094135C1 (fr)
WO (1) WO1996035521A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112005003854B4 (de) * 2004-06-23 2018-04-26 Masataka Tamura Brechvorrichtung
WO2008009019A1 (fr) * 2006-07-14 2008-01-17 University Of Florida Research Foundation, Inc. Classificateur de cônes de rotation
RU2450862C1 (ru) * 2010-12-13 2012-05-20 Государственное образовательное учреждение высшего профессионального образования "Оренбургский государственный университет" Устройство для измельчения целых зерен в смесях
US11821655B2 (en) 2014-08-12 2023-11-21 Novaerus Patents Limited Air treatment system, method and apparatus
GB2529173B (en) 2014-08-12 2016-08-24 Novaerus Patents Ltd Flexible electrode assembly for plasma generation and air ducting system including the electrode assembly
DE112017004019T5 (de) 2016-08-09 2019-05-02 Mitsugi Inkyo Klassierungsverfahren und -vorrichtung

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4140656C1 (fr) * 1991-12-10 1992-09-10 Alpine Ag, 8900 Augsburg, De

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU829211A1 (ru) * 1979-07-26 1981-05-15 Государственный Всесоюзный Научно-Исследо-Вательский Институт Цементной Промышленности"Ниицемент" Центробежный сепаратор
GB2110962B (en) * 1981-12-10 1985-08-14 Greville Nicolas Whiddett Powder classifier
SU1316719A1 (ru) * 1985-12-29 1987-06-15 Ивановский Химико-Технологический Институт Центробежный классификатор
SU1620161A2 (ru) * 1986-09-24 1991-01-15 Институт химии твердого тела и переработки минерального сырья СО АН СССР Центробежный классификатор дл разделени высокодисперсного материала
US4793917A (en) * 1987-04-15 1988-12-27 Institut Khimii Tverdogo Tela I Pererabotki Mineralnogo Syrya Sibirskogo Otdelenia Akademii Nauk Ussr Centrifugal classifier for superfine powders

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4140656C1 (fr) * 1991-12-10 1992-09-10 Alpine Ag, 8900 Augsburg, De

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO9635521A1 *

Also Published As

Publication number Publication date
JP2002515819A (ja) 2002-05-28
WO1996035521A1 (fr) 1996-11-14
RU2094135C1 (ru) 1997-10-27
AU6759096A (en) 1996-11-29
KR19980701206A (ko) 1998-05-15
EP0788842A4 (fr) 1997-08-29

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