EP0004865B1 - Tamiseur pneumatique - Google Patents

Tamiseur pneumatique Download PDF

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Publication number
EP0004865B1
EP0004865B1 EP79100767A EP79100767A EP0004865B1 EP 0004865 B1 EP0004865 B1 EP 0004865B1 EP 79100767 A EP79100767 A EP 79100767A EP 79100767 A EP79100767 A EP 79100767A EP 0004865 B1 EP0004865 B1 EP 0004865B1
Authority
EP
European Patent Office
Prior art keywords
rotor
sifting
channels
air
delivery
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
EP79100767A
Other languages
German (de)
English (en)
Other versions
EP0004865A2 (fr
EP0004865A3 (en
Inventor
Josef Prof. Dr.-Ing. Wessel
Manfred Müller
Otto Heinemann
Norbert Bredenhöller
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.)
ThyssenKrupp Industrial Solutions AG
Original Assignee
Krupp Polysius 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 Krupp Polysius AG filed Critical Krupp Polysius AG
Publication of EP0004865A2 publication Critical patent/EP0004865A2/fr
Publication of EP0004865A3 publication Critical patent/EP0004865A3/xx
Application granted granted Critical
Publication of EP0004865B1 publication Critical patent/EP0004865B1/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
    • 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 an air classifier, comprising a rotor, which is centrally loaded with visible material, with star-shaped visible material feed channels and with suction openings arranged between the visible material feed channels, and further comprising at least one suction housing arranged in an axial extension of the rotor and connected to the suction openings of the rotor , where sifting air flows through the space between adjacent sifting material feed channels essentially from the outside inwards and together with the fine material enters the suction housing through the suction openings of the rotor, while the coarse material is flung outwards.
  • a wind sifter of the type mentioned above is described for example in DE-B-2 225 258. Compared to other known designs, it is characterized above all by a significantly higher throughput rate with the same diameter, a relatively simple structural design and a high degree of selectivity.
  • the rotor essentially consists of two cover disks, between which a number of ribs are arranged in a star shape, which form the material feed channels.
  • One of the two cover disks is provided in the area between adjacent visible material feed channels with openings which represent the suction openings of the rotor through which the fine air enters the stationary suction housing arranged under the rotor.
  • the space located between the outer end of the material feed channels and the suction openings mentioned is thus axially limited in the known embodiment by a cover plate of the rotor.
  • Said outer ring area of the lower cover disk of the rotor according to DE-B-2 225 258 is inevitably subject to a certain amount of wear during operation, both on its upper side that delimits the flow of visible material and on its underside, which together with the opposite fixed wall of the Suction housing forms a sealing gap.
  • a wind sifter is also known (US Pat. No. 2,968,401), the rotor of which is loaded with visible material from outside at one point on the circumference.
  • the fine material flows together with the classifying air through the rotor from the outside inwards and is discharged through a suction housing arranged in a fixed axial extension of the rotor, while the coarse material fails in the space surrounding the rotor.
  • the winged outer part of the rotor is bounded towards the top by a fixed wall of the suction housing, which extends radially outwards beyond the circumference of the rotor.
  • a major disadvantage of this known classifier lies in the highly uneven distribution of the visible material that is fed in only at one peripheral point over the rotor circumference. Due to the wall of the suction housing which extends far beyond the rotor circumference and which limits the space between the rotor blades and the space outside the rotor, through which fine material and sifting air flow, there is also a very uneven distribution of the sifting air flowing in from below over the axial height the viewing area (ie the area around the circumference of the rotor). In the known sifter, both influences lead to a vehemently poor selectivity of the sighting.
  • the invention is therefore based on the object of developing a wind sifter of the type mentioned at the outset while maintaining its basic advantages (in terms of throughput, structure and selectivity) in such a way that the wear problems in the outer area of the rotor are reduced, the mentioned problem of setting the sealing gap between the rotor and the suction housing is eliminated and finally the free flow cross-section for the classifying air is increased while the overall dimensions of the classifier remain the same.
  • the already existing fixed flange of the suction housing thus replaces part of the invention (namely the one cover plate) of the rotor and takes over the function of this rotor part to limit the flow path of classifying air and fine material axially towards the side of the suction housing.
  • the elimination of this wearing part considerably simplifies maintenance.
  • the fixed flange of the suction housing does not protrude outward beyond the rotor. Rather, this fixed flange of the suction housing and the base plate of the rotor, which axially delimit the space through which fine material and sifting air flows between adjacent sifting air supply channels, have an outer circumference, close to which the sifting material supply channels end.
  • this outer circumference i.e. in the actual viewing zone, a very even distribution of the viewing air over the axial height of the viewing area is achieved. Together with the even distribution of the material to be viewed over the circumference of the rotor, this ensures a high degree of selectivity of the sighting.
  • the wind sifter illustrated schematically in FIGS. 1 to 3 in the elements essential for understanding the invention contains a central rotor 2 which is supplied with visible material from above via a feed tube 1 and a suction housing 3 which is arranged in an axial extension of the rotor above this.
  • the rotor 2 driven from below via a shaft 4, carries on a base plate 5 a number of visible air supply channels 7, 7a, 7b etc., which run in a star shape to the outside and whose axis 8 is directed to an outer area of the central visible material task 1) adjoins horizontal imaginary circle 9 tangentially.
  • the feed channels 7, 7a, 7b etc. are inclined backwards in the direction of rotation of the rotor (arrow 10).
  • the visible material feed channels 7, 7a, 7b etc. are formed by hollow profile parts 11 which are closed on all sides (cf. FIG. 3).
  • the fixedly arranged suction housing 3 has on the side facing the rotor 2 in the outer region a flange 12 which covers the outer ring zone of the rotor 2.
  • the inner edge 13 of the suction housing 3 is indicated by dashed lines.
  • the visible material that is fed into the rotor 2 via the pipe 1 is thrown outwards by the rotary movement of the rotor in the visible material supply channels 7, 7a, 7b (arrows 15) and is captured by the visual air when leaving these visual material supply channels. which is sucked in from the outside (arrows 16). While the coarse material (arrow 17) is thrown outwards, the classifying air detects the fine material (arrows 18) and takes it into the flow space between adjacent classifying material feed channels. The part of this flow space initially penetrated by the sifting air and the fine material is limited at the top by the flange 12 of the stationary suction housing 3.
  • the space located between the outer end of the visible material supply channels 7, 7a, 7b etc. and the suction openings 9 between adjacent visual material supply channels on the side facing the suction housing 3 is closed by a fixed element, namely by the flange 12 of the suction housing limited.
  • the visible material feed channels 7, 7a, 7b etc. end close to the outer circumference of the base plate 5 of the rotor 2 or the flange 12 of the suction housing 3.
  • the elongation of the visible material feed channels thus achieved results in a better resolution and acceleration of the material to be viewed, which enables the rotor speed to be reduced with the same visual effect.
  • an enlargement of the outer circumference of the suction openings 19 and thus an enlargement of the critical flow cross section for the classifying air are achieved in this way.
  • Fig. 4 shows a modified embodiment of a visible material feed channel 7 ', which is open on one side, approximately C-shaped ges hollow profile 20 is formed.
  • the rotor moves in the direction of arrow 21; the open side of the hollow profile 20 thus hurries ahead in the direction of rotation of the rotor.
  • the visible material is held and guided outward by the Coriolis force in the feed channel 7 ' during its movement in the feed channel 7'.
  • Such an open design of the visible material feed channels is characterized by a high level of operational reliability (avoidance of any blockages) and particularly low wear.
  • FIG. 5 shows an exemplary embodiment with the visual air being extracted downwards.
  • the suction housing 33 is arranged here under the rotor 32.
  • This rotor 32 essentially contains a central spreading plate 34, a conical hood 35 and a number of star-shaped visible material feed channels 37, which are formed by straight or curved, closed or open hollow profile parts.
  • the suction openings 39 of the rotor lie along an imaginary conical surface, the tip of which points from the suction housing 33 to the rotor 32. 5 that it results in a particularly favorable air distribution and a particularly smooth, turbulence-free inflow of the visible air (arrows 40) into the suction housing 33.
  • the uniformity of the air flow improves the selectivity.
  • the inclination of the conical hood 35 corresponds to the inclination of the conical surface mentioned, along which the suction openings 39 are arranged; however, it is understood that the inclination of the conical hood 35 can also be smaller; it is also possible to form the upper boundary surface of the rotor 32 by a flat disk lying perpendicular to the rotor axis. In this case, the cross section of the material feed channels widens from the inside to the outside.
  • the space between adjacent visible material feed channels between the outer end of the visible material feed channels 37 and the suction openings 39 is delimited by a flange 42 of the stationary suction housing 33. 5 can also be modified such that the lower edge of the material feed channels in the outer region and thus also the flange 42 run horizontally.
  • Fig. 6 shows an embodiment in which a suction housing 53 or 53a is arranged on both sides of the rotor 52.
  • the rotor 52 which is driven from below via a shaft 54, bears on a base plate 55 which also serves as a spreading plate, a number of star-shaped feed material channels 57 which, as in the exemplary embodiments explained above, run in a straight line or curved manner and can be formed by open or closed hollow profile parts.
  • the space between the outer end of the material feed channels 57 and the suction openings 59 and 59a is delimited on the top and bottom of the rotor by a flange 62 and 62a of the suction housing 53 and 53a.
  • the visual air (arrows 63) is extracted upwards and downwards.
  • the hollow profile parts forming the visible material feed channels can be produced from extruded profile material. This is particularly expedient in the case of a straight line of the visible material feed channels (cf. FIG. 2), since in this case the visible material feed channels can be produced by simply cutting off strand material.
  • the profile parts forming the visible material feed channels can also be made of plastic, provided that sufficient temperature resistance and wear resistance are guaranteed.
  • plastic profile parts can be reinforced on the surfaces exposed to increased wear.
  • the ratio H / D is expediently chosen between 1: 4 and 1:15, preferably between 1: 7 and 1:12.
  • the ratio H: D is expediently between 1: 2 and 1:10, preferably between 1: 3.5 and 1: 7.
  • Another modification of the invention is to slightly incline the outer mouth of the material feed channels with respect to the classifier axis, so that the edge of this mouth facing away from the suction opening lies on a somewhat smaller diameter than the mouth edge facing the suction opening. This achieves a compensation for the somewhat uneven flow velocity of the air at a higher duct height (slightly larger near the suction opening than on the side facing away from the suction opening), which leads to an increase in the selectivity.
  • the visible material feed channels are curved and incline backwards in the direction of rotation of the rotor. Due to the curved arrangement, the desired visual fineness can be achieved at a lower speed; one also achieves a maximum exit angle of the material with respect to the radius vector, which improves the efficiency of the sighting.

Landscapes

  • Combined Means For Separation Of Solids (AREA)
  • Cyclones (AREA)
  • Centrifugal Separators (AREA)

Claims (9)

1. Séparateur à vent comprenant un rotor (2) dont le chargement en matière à classer s'effectue centralement et qui comporte des canaux (7, 7a, 7b) de chargement de cette matière qui sont orientés en étoile vers l'extérieur, ledit séparateur comprenant par ailleurs des ouvertures d'aspiration (19) situées entre lesdits canaux de chargement (7, 7a, 7b) ainsi qu'au moins une boîte d'aspiration (3) montée fixe, se raccordant à la suite des ouvertures (19) d'aspiration du rotor et disposée dans le prolongement de l'axe du rotor (2), l'air de séparation balayant l'espace se trouvant entre les canaux voisins de chargement (7, 7a, 7b) essentiellement de l'extérieur vers l'intérieur et entrant dans la boîte d'aspiration (3) avec les particules fines par les ouvertures d'aspiration (19) du rotor (2), tandis que les grosses particules sont projetées vers l'extérieur, séparateur à vent caractérisé par la combinaison des particularités suivantes:
a) une bride fixe (12) de la boîte d'aspiration (3) qui recouvre la zone annulaire extérieure du rotor (2) délimite l'espace qui est compris entre les canaux de chargement voisins (7, 7a, 7b) et situé entre l'extrémité extérieure de ces canaux (7, 7a, 7b) et les ouvertures d'aspiration (19) et par lequel passent les particules fines et l'air de séparation;
b) les canaux (7, 7a, 7b) de chargement de la matière à classer aboutissent à proximité immédiate de la circonférence extérieure de la plaque d'assise (5) du rotor (2) ainsi que de la bride (12) de la boîte d'aspiration (3), cette plaque d'assise (5) et cette boîte d'aspiration (3) délimitant dans la direction de l'axe l'espace compris entre les canaux voisins de chargement de la matière (7, 7a, 7b) et par lequel passent les particules fines et l'air de séparation.
2. Séparateur à vent selon la revendication 1, caractérisé en ce qu'une boîte d'aspiration (53, 53a) est prévue sur chacun des deux côtés du rotor (52) et une bride fixe (62, 62a) de la boîte d'aspiration correspondante (53, 53a) délimite dans la direction de l'axe, sur les deux côtés, l'espace compris entre les canaux voisins de chargement (57) et par lequel passent les particules fines et l'air de séparation.
3. Séparateur à vent selon la revendication 1, caractérisé en ce que les canaux de chargement de la matière à classer sont incurvés et inclinés vers l'arrière par rapport au sens de rotation du rotor.
4. Séparateur à vent selon la revendication 1, caractérisé en ce que les canaux (7') de chargement de la matière à classer, qui sont formés de profilés creux (20), sont au moins partiellement ouverts du côté situé à l'avant par rapport au sens de rotation (21) du rotor.
5. Séparateur à vent selon la revendication 1 et à aspiration de l'air de séparation d'un seul côté, caractérisé en ce que le rapport de la largeur (H), dans la direction de l'axe du rotor (2), des canaux (7b) de chargement de la matière à classer au diamètre (D) du rotor est compris entre 1:4 et 1:15, de préférence entre 1:7 et 1:12.
6. Séparateur à vent selon la revendication 2 et à aspiration de l'air de séparation des deux côtés, caractérisé en ce que le rapport de la largeur, dans la direction de l'axe du rotor, des canaux de chargement de la matière à classer au diamètre du rotor est compris entre 1:2 et 1:10, de préférence entre 1:3,5 et 1:7.
7. Séparateur à vent selon la revendication 1, caractérisé en ce que les ouvertures d'aspiration (39) du rotor (32) sont situées de long d'une surface conique imaginaire dont la pointe est orientée de la boîte d'aspiration (33) vers le rotor (32).
8. Séparateur à vent selon la revendication 7, caractérisé en ce qu'un capot conique (35) du rotor (32) forme la cloison qui délimite dans la direction de l'axe l'espace par lequel passent les particules fines et l'air de séparation et qui est compris entre les canaux voisins (37) de chargement de la matière à classer, l'inclinaison dudit capot (35) étant au maximum égale à celle de ladite surface conique imaginaire le long de laquelle se trouvent les orifices d'aspiration (39) du rotor (32).
9. Séparateur à vent selon la revendication 1, caractérisé en ce que l'orifice extérieur des canaux (7, 37, 57) de chargement de la matière à classer est légèrement incliné sur l'axe du séparateur, le bord de cet orifice qui est tourné du côté opposé à celui de l'ouverture d'aspiration (19, 39, 59) se trouvant sur un diamètre légèrement plus petit que celui du bord de l'orifice qui est tourné vers cete ouverture d'aspiration.
EP79100767A 1978-04-22 1979-03-14 Tamiseur pneumatique Expired EP0004865B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2817725 1978-04-22
DE19782817725 DE2817725A1 (de) 1978-04-22 1978-04-22 Windsichter

Publications (3)

Publication Number Publication Date
EP0004865A2 EP0004865A2 (fr) 1979-10-31
EP0004865A3 EP0004865A3 (en) 1979-11-28
EP0004865B1 true EP0004865B1 (fr) 1983-02-23

Family

ID=6037761

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79100767A Expired EP0004865B1 (fr) 1978-04-22 1979-03-14 Tamiseur pneumatique

Country Status (5)

Country Link
US (1) US4236997A (fr)
EP (1) EP0004865B1 (fr)
JP (1) JPS54141457A (fr)
DE (1) DE2817725A1 (fr)
ES (1) ES8100617A1 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8011007U1 (de) * 1980-04-23 1980-08-07 Krupp Polysius Ag, 4720 Beckum Windsichter
DE3044063A1 (de) * 1980-11-22 1982-07-15 Krupp Polysius Ag, 4720 Beckum Windsichter
JPS594477A (ja) * 1982-06-30 1984-01-11 日清製粉株式会社 粉体分級機
IT1171172B (it) * 1983-06-03 1987-06-10 Umberto Manola Dispositivo particolarmente adatto per impianti adibiti alla separazione fisica dei componenti di farine ad uso alimentare o per altri usi
GB8415190D0 (en) * 1984-06-14 1984-07-18 Smidth & Co As F L Separator
JPS61262198A (ja) * 1985-05-16 1986-11-20 カシオ計算機株式会社 小型ｘ−ｙプロツタ
DE3521491A1 (de) * 1985-06-14 1986-12-18 Krupp Polysius Ag, 4720 Beckum Verfahren und anlage zur feinzerkleinerung von gut
EP0262124B1 (fr) * 1986-04-11 1990-08-29 Beloit Corporation Separateur rotatif
DE3622413C2 (de) * 1986-07-03 1995-08-03 Krupp Polysius Ag Sichter
US6739456B2 (en) 2002-06-03 2004-05-25 University Of Florida Research Foundation, Inc. Apparatus and methods for separating particles
CN115428625B (zh) 2016-07-29 2024-08-02 9754741加拿大有限公司 一种用于分离流中的颗粒的方法和装置
CN112337795B (zh) * 2020-03-11 2022-08-09 江门市辰源地毯科技有限公司 一种pvc聚合物生产调配的分料控制方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1126481A (fr) * 1955-05-11 1956-11-23 Ultrafine De L Union Francaise Perfectionnement aux classificateurs de matières pulvérulentes

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE195713C (fr) *
DE671594C (de) * 1937-06-04 1939-02-10 Kohlenscheidungs Ges M B H Vorrichtung zum Sichten eines in einem Gasstrom enthaltenen Gemisches
GB694219A (en) * 1948-10-01 1953-07-15 Alpine Ag Eisengiesserei Und M Improvements in centrifugal flow separators
FR1126487A (fr) * 1955-05-12 1956-11-23 Jaeger Ets Ed Commutateur thermostatique
US2968401A (en) * 1956-09-05 1961-01-17 American Marietta Co Air classifier
US2943735A (en) * 1957-06-13 1960-07-05 Sharples Corp Particle classifiers
US3048271A (en) * 1960-02-24 1962-08-07 Sharples Corp Particle classification
US3891543A (en) * 1971-02-03 1975-06-24 Josef Wessel Centrifugal sifter apparatus
DE2551175A1 (de) * 1975-11-14 1977-05-26 Erich Beck Spiralwindsichter

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1126481A (fr) * 1955-05-11 1956-11-23 Ultrafine De L Union Francaise Perfectionnement aux classificateurs de matières pulvérulentes

Also Published As

Publication number Publication date
US4236997A (en) 1980-12-02
DE2817725A1 (de) 1979-11-08
ES479796A0 (es) 1980-07-01
EP0004865A2 (fr) 1979-10-31
EP0004865A3 (en) 1979-11-28
ES8100617A1 (es) 1980-07-01
JPS54141457A (en) 1979-11-02
JPS5728306B2 (fr) 1982-06-16

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