EP0463141A1 - Spiralwindsichter. - Google Patents
Spiralwindsichter.Info
- Publication number
- EP0463141A1 EP0463141A1 EP91902300A EP91902300A EP0463141A1 EP 0463141 A1 EP0463141 A1 EP 0463141A1 EP 91902300 A EP91902300 A EP 91902300A EP 91902300 A EP91902300 A EP 91902300A EP 0463141 A1 EP0463141 A1 EP 0463141A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- side walls
- space
- sight
- separation space
- gas
- 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
Links
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
Definitions
- the invention relates to a spiral air classifier with a substantially cylindrical, free of built-in view space with fixed side walls, with a sight gas supply through a guide vane grille coaxially surrounding the view space, with a sight material supply on the outer circumference of the view space, with a discharge device for the outer circumference of the Coarse material drawn off from the visible space and with a central connecting piece for the discharge of the sighting gas with the fine material in an end wall of the sighting space.
- air is used as the classifying gas and, in the vicinity of the central opening, air is additionally introduced in the end walls of the classifying chamber at a high speed in relation to the classifying gas flow in the form of a flow against the end wall.
- the direction of rotation of the vortex flow that arises around the central opening is equal to the direction of rotation of the visual flow in the visual space.
- the sealing air must have a correspondingly high pressure to ensure that the To maintain the required rotational flow in the area near the wall. A separate compressed air supply is required for this, which causes a corresponding structural effort and energy expenditure.
- the known construction can lead to disturbing eddy formation. Apart from that, an ideal flow field for the sighting cannot be generated. Finally, blowing in sealing air may lead to undesired cooling of the classifying gases.
- the invention aims to provide a spiral wind sifter that enables an accurate screening of finely reduced solids in the micrometer range, such as talc, graphite, etc., with low energy consumption and air consumption under extreme pressure and temperature conditions.
- This is achieved according to the invention in a spiral air classifier of the type specified in the introduction in that fixed guide disks are arranged at a distance from the side walls of the viewing space, the edges of which form annular gaps with the side walls and which limit the actual viewing space.
- the side walls of the viewing space are preferably too conically expanded towards the center of the viewing space.
- the spiral air classifier according to the invention has no mechanically movable internals, such as rotors, and is therefore suitable for exceptionally high pressure and temperature ranges.
- the inventive design of the viewing area can ensure a uniform flow field and uniform viewing conditions over the entire width of the viewing area. This increases the separation quality. In particular, an exact sighting can be achieved with low energy consumption and sight gas. Since the stationary guide disks in the classifier according to the invention are arranged at a distance from the lateral viewing area boundaries and are therefore not connected to them in the area of the viewing zone, it follows that no visible material can get into the fine material from the viewing zone near the wall and only fine material that has been sighted can pass between the guide disks . A The spiraling sight gas flow is slowed down in the vicinity of the lateral view space limitation, but does not interfere.
- Fig. 1 shows a spiral wind sifter according to the invention in a section perpendicular to the axis of the viewing space and
- Fig. 2 shows a section along the line II-II in Fig. 1.
- the high-performance air classifier 1 is designed according to FIGS. 1 and 2 as a spiral air classifier, which is intended for the dry separation of dusty substances in the finest grain area, such as talc, graphite, etc.
- the material to be sighted which is introduced into a classifying chamber 4 by a metering device 2 via a classifying material entry 3, is from 500 ° -700 ° C. hot gas jets, which are tangential from a classifying gas entry 3 ′ via guide vanes 5 into the flat-cylindrical classifying room 4 enter, flushed.
- the individual particles of the grain collective are accelerated and entrained on the one hand by the gas jets, which flow spirally through the visible space from the outside inwards, but are also subject to the centrifugal force, which deflects them outwards again.
- the entraining force of the flow and the particle is discharged as a fine material with the gas flow for a certain grain shape and mass of the individual particle, or the centrifugal force and the particle are driven off to limit the visible space and finally via a coarse material discharge 6 as coarse material carried out.
- Rigid guide disks 8 are arranged at a distance from the side walls 7, which extend from a central outlet opening 9 for the classifying gas with the fine material or from a connecting piece connected to the opposite side wall 7, limit the actual viewing zone and annular gaps 10 with the side walls form. This becomes an uncontrolled one Prevention of coarse material in the fine material discharge along the side boundary of the air classifier is prevented. In the wind sifter explained above, a uniform flow field is present over the entire width of the viewing area, which also ensures the same visibility.
- the invention thus enables the construction of a very simple and therefore inexpensive air classifier which, as a pressure-tight closed system without rotating parts and without sealing air, can also be used very economically in the high pressure and temperature range, but also in the negative pressure range and at low temperatures, and is excellent ensures the separation effect.
Landscapes
- Combined Means For Separation Of Solids (AREA)
- Cyclones (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT82/90 | 1990-01-16 | ||
AT0008290A AT398173B (de) | 1990-01-16 | 1990-01-16 | Verfahren zum mahlen von feststoffen |
PCT/AT1991/000008 WO1991010513A1 (de) | 1990-01-16 | 1991-01-15 | Spiralwindsichter |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0463141A1 true EP0463141A1 (de) | 1992-01-02 |
EP0463141B1 EP0463141B1 (de) | 1994-09-14 |
Family
ID=3481055
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91902300A Expired - Lifetime EP0463141B1 (de) | 1990-01-16 | 1991-01-15 | Spiralwindsichter |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0463141B1 (de) |
AT (2) | AT398173B (de) |
DE (1) | DE59102906D1 (de) |
WO (1) | WO1991010513A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006048865A1 (de) * | 2006-10-16 | 2008-04-17 | Roland Dr. Nied | Verfahren zur Erzeugung feinster Partikel und Strahlmühle dafür sowie Windsichter und Betriebsverfahren davon |
TW201422298A (zh) * | 2012-12-06 | 2014-06-16 | an-xin Lin | 電氣濾網及其風鼓設備 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2767437A (en) * | 1952-02-11 | 1956-10-23 | Donald E Marshall | Method of amalgamating and extruding soap |
US2763437A (en) * | 1953-01-16 | 1956-09-18 | Sturtevant Mill Co | Apparatus for grinding |
DE2029700A1 (de) * | 1970-06-16 | 1971-12-23 | Bayerische Berg , Hütten und Salz werke AG, 8000 München | Windsichter |
DE2629745C2 (de) * | 1976-07-02 | 1982-04-01 | Alpine Ag, 8900 Augsburg | Spiralwindsichter |
FI74890C (fi) * | 1985-11-29 | 1988-04-11 | Larox Ag | Foerfarande och anordning foer framstaellning av en klassificerad fraktion av finfoerdelat material. |
-
1990
- 1990-01-16 AT AT0008290A patent/AT398173B/de not_active IP Right Cessation
-
1991
- 1991-01-15 WO PCT/AT1991/000008 patent/WO1991010513A1/de active IP Right Grant
- 1991-01-15 AT AT91902300T patent/ATE111382T1/de not_active IP Right Cessation
- 1991-01-15 EP EP91902300A patent/EP0463141B1/de not_active Expired - Lifetime
- 1991-01-15 DE DE59102906T patent/DE59102906D1/de not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9110513A1 * |
Also Published As
Publication number | Publication date |
---|---|
ATA8290A (de) | 1994-02-15 |
WO1991010513A1 (de) | 1991-07-25 |
EP0463141B1 (de) | 1994-09-14 |
ATE111382T1 (de) | 1994-09-15 |
DE59102906D1 (de) | 1994-10-20 |
AT398173B (de) | 1994-10-25 |
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