DE2012797A1 - Centrifugal air separator - Google Patents

Description

Peter Voelskow VDI, 655 Bad Kreuznach «Kiefernweg Centrifugal air classifier

The invention relates to a centrifugal air classifier for ! Separation of light weight suspended in air or other gases Bulk solids according to different sinking speed

There are numerous constructions of air separators, for example for separating wood chips into individual! fractions, known, in which the chips in the ascending air | currents are separated according to their rate of descent (Compare issue 11/69 of the journal Holz as raw and Material: "The modern chipboard production. · *> ♦ ·" by Max Himmelifte and Walter KuIl, page 4o5, scheme, Drawings and explanations of three different makes of classifier,)

Such known air classifiers require a relatively large ascending clearing room, a powerful fan to generate the ascending classifying air, and at least one cyclone separator with cell lock for Discharge of the pain carried above with the sifting air na <$ h: ■ good, tier construction costs are relatively high, the space; The need is very high, the operating costs for the fan are high! because the flow resistances in the cyclone separator, which are very high, and the main disadvantage is the classifying air that passes through the cyclone separators into the outside atmosphere Finest not separated with TfOm cyclone separator Dust particles

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20T2797

With the ever more stringent laws to keep the air clean, such cyclone separators would still have to be ! cloth filters are connected downstream, which makes the construction work unacceptable would increase, or it must, as already applied, the air from the cyclone separator back to Blower are guided and in a closed circuit through the ascending separation chamber, the cyclone separator and the ) Blowers are guided · With this last-named design the cost of pipelines is considerable.

Centrifugal air classifiers are also known, especially in other branches of industry, which offer the advantage of reducing the actual classifying space by increasing the speed force field. However, also in this case the fines is carried with the classifying air from the centrifugal separator to a separate cyclone separator or filter cloth or the like and there ^w air separated from the sight. As a result, the construction costs and the power requirements for the classifying air blower are also considerable.

The invention avoids these disadvantages by using two or more rotor separators connected in series, if necessary each axially offset fan blade wheels, whereby the individual separators in their effectiveness differ on the size of the deposited particles and the whole system is arranged in a closed housing, shut off from the outside air, in which the sifting air (or corresponding gases) flows through the individual classifier and separator units in the circuit.

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Here, the view of air, the adjacent viewing and blower rooms can describe the path of a double figure eight and the direction of rotation of the hot water separator can be opposite.

However, the sifting air can also be

• - ■ «

The viewing and fan rooms take the path of an oval double loop and the direction of rotation of the rotor separator is then the same

Her feed inlet can be designed without the exclusion of air be when the Gutauslaufe with air exclusion by dent locks are provided »

A preferred embodiment of this arrangement has the crop inlet centrally on the blower impeller of the debris separator »because it turned out that the entire closed unit stent under a slight overpressure, so that there are no fine material particles are sucked back into the unit through leaks in the cell lock at the material outlet for the fine material.

It is particularly advantageous to pass the sifting air onto the rotating Coarse material separator radial or at an angle between radial and axial impingement while they blown tangentially into the housing around the fines separator will·

The housing is advantageously around the coarse material separator a fixed vanes and an axial spiral housing are connected upstream. This means that the view is initially open entered in a circling manner in the axial volute casing through the Guide vane ring from the orbiting into an axial movement

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deflected, and then possibly slightly by guide plates, guide channels or the like from the axial direction diverted in the radial direction to the coarse material separator. In this way, everyone who is floating in the sifted air can be found Particles on the coarse material separator, which then the fine i'eilchen formed by the coarse in its rotating force field by radial inflow velocity and centrifugal force of the rotating separator acting radially outwards, separates and throws the coarse parts into the surrounding space. In the case of the fines separator, most of the in the The centrifugal force on the inside wall of the housing directs the material floating in the air to the discharge cell sluice and only the finest particles reaching the separator rotor are returned to its centrifugal force field thrown away from the outside

The figures explain the invention in more detail: FIG. 1 shows a two-stage centrifugal wind sifter according to the invention with air duct in the form of a Doppe1 loop. Figure 2 shows a cross section through the same unit.

The material inlet (1) opens approximately centrally into the spiral housing (2), in which the fan impeller (5) of the fines separator (4 6), deflected by the guide vane ^{ring (7) in axial direction and through +} annular channel (8), formed by

+ the

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the ring-shaped baffles (9) on the coarse material separator (lo) The rotating coarse material separator (lo) hurls the coarse material into the separation chamber (11) from which it is discharged via the discharge channel (12) and the cell lock (15) · The fine material is transported through the rotating Rod or blade cage of the coarse material separator (lo) is sucked inwards and over the fan impeller (14), the spiral housing (15) and the channel (16) blown tangentially into. The separation chamber (17) of the fine material separator (4). Of the Separation chamber (1?), The fine material is discharged via the outlet nozzle (18) and the cell lock (19). the Any remaining fine material particles still floating in the classifying air are removed by the rotating foing material separator (4) in the separation chamber (17) is thrown back and the cleaned The classifying air enters the fan impeller (3) and from there into the spiral housing (2), where it passes through the. Feed chute Cl) is mixed again with classifying material »

(The publications taken into account in the drafting of the German Patent Nos .: 737,374-, 849 793 »856 4o3, 87o 936 and 911 o92).

Claims (1)

Patent claims: Centrifugal air classifier consisting of two or more rotor separators connected in series with, if necessary, each axially offset fan blade wheels, characterized in that the individual separators -6-109850 / 0371 ·· \ Q ^ M j differ in their effectiveness on the size of the deposited particles, and the whole system in one closed housing, shut off from the outside air, in which the classifying air (or equivalent Gases) flows through the individual classifying and separating units in the circuit 2.) Centrifugal air classifier according to claim 1, characterized in that the classifying air through the adjacent ~ classifying and blower rooms describes the path of a double figure eight and the direction of rotation of the Kotor separator is opposite. 5.) centrifugal air classifier according to claim 1, characterized in that that the sifting air through the adjacent sifting and blower rooms takes the path of an oval double loop describes and the direction of rotation of the Kotor separator is the same is· 4.) centrifugal air classifier according to claims 1-3 thereby ) characterized in that the crop inlet (1) without air exclusion and the crop outlets (12, 18) with air exclusion through cell locks (13,19) are formed 5.) centrifugal air classifier according to claim 4, characterized in that that the material inlet (1) is arranged centrally on the spiral housing (2) of the fan impeller (3) from the fines separator (4) is· 6.) centrifugal air classifier according to claims 1-5 thereby characterized in that the classifying air on the coarse material separator (lo) radial or at an angle between radial and axial 109850/0371 strikes and into the housing (17) around the fines separator ' (4) is blown in tangentially. 7.) centrifugal air classifier according to claim 6, characterized in that that the housing (11) around the coarse material separator (10) has a fixed guide vane ring (7) and an axial spiral housing (6) is connected upstream 10985070371 Blank page