DE1757339A1 - Device for filtering air - Google Patents

Description

Patent attorney β MÖNCHEN, April 23, 1968 / E DR.WILHELM _{HASSE PGm} 3861 / ϊβχ GRADUATE ENGINEER

Gesellschaft für Textiltechnik m.b.H., 7 Stuttgart 1, Gröberstraße 24

Device for filtering air

The invention "relates to a device for filtering Air using at least one screen drum working with positive or negative pressure, the outer surface of which covered with a fur made of pneumatically conveyed fibers or the like (wool or cotton particles, flax, etc.) and further comprises means for removing the fur.

Known devices work with a sieve drum} which sucks in the fiber material or the like; a fiber layer is thus formed = Fur. The air now sucked through this fur is cleaned by depositing dust particles, fibers and the like and can be fed back into the work area.

The disadvantage of the known devices is that due to the uneven accumulation of the material, namely light or heavy or coarse or fine goods, the air permeability varied and a uniform air purification is not possible due to different pressures on the sieve drum.

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The object of the invention is to create a device " which forms an even layer of fur made of fibers. In addition, the new task is to be achieved, the material pneumatically conveyed into the device from the conveying air flow in such a way that it is separated into two qualities.

The problem posed is achieved in that the supply shaft (conveying air shaft) i.w. can be aligned tangentially to the sieve drum shell and thus into a curved sieve drum

^ housing passes over, that the inertia can be exploited, i.e. the heavy particles initially persist on their path and when the air is deflected they leave the air flow and the light particles follow the air flow. As a result, the separation and discharge into two types (qualities) is good (e.g. heavy and light goods) possible. It is also essential that the sieve drum can be driven preferably in the opposite direction to the direction in which the goods are introduced and that at least one known axis is preferably below (but could also be provided at the same level or higher) of the sieve drum axis

w Waste chamber, a cellular roller or the like. Is arranged.

With this measure according to the invention, the light material (the loosened fibers) passes through the sieve drum with it passing air stream on the sieve drum shell and there forms a homogeneous fiber layer, so that the air throughput per surface unit evenly 1st and a perfect one Filtering the air can be guaranteed. However, the screen drum can also only be acted upon by overpressure.

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At the same time the second task is solved, according to which the heavy or coarse material, depending on its mass inertia, essentially on the housing wall, e.g. to a Cell roller is guided. This material does not end up on the sieve drum. Now you can have the coarse and the fine goods remove separately, because the filtered fibers (= fine fur) represent a higher sales value.

This measure according to the invention saves, among other things, one

second Paserabscheider and a second line. M.

Another feature of the invention can be seen in the fact that the curved sieve drum housing at least in the area above the sieve drum once i.w. be designed in the shape of an arc of a circle &ann; the sieve drum is then eccentric in the housing provided, i.e. the distance to the housing wall is greater where the goods are introduced. You can use any form of sieve drum housing choose whose cross-section corresponds to the curve of a mathematically 'continuous puncture and which a The inertia takes effect; for example, elliptical, parabolic or hyperbola-like Porm is thought of; The apex of these cross-sectional shapes is expediently above the sieve drum axis, but can also be used by & Leser Position.

The feed shaft can open into the sieve drum housing approximately at the level of the sieve drum axis.

1 G 3 C 1 5/0 7 λ 3

The settling or separation of the goods can be promoted by air baffles, which are expediently spaced apart arranged around the sieve drum shell. Such air baffles can be spaced from one another or from the screen drum shell be adjustable. Furthermore, their alignment can be set individually or in groups.

The invention includes an inner cover plate, which is preferably adjustable and / or extendable. This way you can use the ) Cover the part of the sieve drum that is barely exposed to pressure, because the aim is to achieve the most even air flow possible per unit area.

Another feature of the invention can be seen in the fact that the cover plate has an outwardly pointing bend, preferably at the free end, where the item is to be lifted off. The air sucked in by the sieve drum is then deflected outwards again (through the sieve drum). and lifts the item off at this point, thus supporting the effect of the scraper or, under certain circumstances, a scraper is not required. This inventive concept is supplemented by providing a scraper and letting the inner cover overlap with the scraper. This creates a small air gap (nozzle effect) and increases the lifting force of the medium flowing outwards through the sieve drum.

The sieve drum can be assigned at least one pressure roller, one or more disengageable and engaging rakes or needle bars, a revolving belt or the like for holding the goods, especially in the lower area .

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In addition, the device can be provided with regulating means in order to guarantee the fur thickness in the desired sense. For this you can use vibrating plates that react to changes in the air speed, buttons, Beams of light with light-sensitive cells, etc. This button or the like gives its impulses to the fans further, which convey the air, or to the drive means for the screen roller, so that these speeds in the desired Meaning to be changed.

To increase the speed of the feed into the device You can regulate fiber flakes or the like at the feed chute Provide for cross-section changes if the same goods are always used or if facilities are available to vary the cross-section. A narrowing of the cross-sectional area in the mouth area of the feed shaft would therefore mean an increase in speed, which one then strives for if the heavy goods become kinetic too early Loses energy and falls on the sieve drum.

Further advantageous and expedient features of the to be protected Invention also emerge from the following embodiments as described and / or illustrated; these individual features, like the features already mentioned, are also relevant to the invention together (in combination).

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Pie conveyed pasers pass through the feed shaft with controllable kinetic energy into the housing 9 of the device according to the invention. You have heavy and / or coarse parts migrate along the housing wall in the direction of the cellular roller 2 and are here in a known catfish under sealing of the housing further promoted.

The drive 3 of the cell roller 2 should be infinitely variable

The light or fine fiber parts reach the rotating sieve drum 4 and form the fiber layer through here which is sucked in the air and thus filtered. Xn this Even the finest dust particles are held back by fur. This homogeneous fur layer migrates in the direction of the arrow, for example to a pressure roller 18 and then to the scraper 19 and is removed here.

In Figure 2, the rollers 18, 18a are drawn and also sealing means 14, 15 (elastic sheets made of metallic or non-metallic! Material, etc.) so that the air is forced into the interior of the sieve drum 4 and not in sight of the mouth of the feed shaft 1. In addition, the waste chamber 7 is in FIG indicated.

In Figure 1, the cover plate 10 is then shown and the Bend 11. The Sohaber 19 forms with its free edge 12 and the Abdeokblech 10 an air passage gap; the

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Air initially flows - it is sucked in from the inside of the sieve drum - along the cover plate 10, then becomes again steered by the sieve drum 4 to the outside and lifts (see arrow) the material already, so that the scraper is a kind of auxiliary represents for very strongly adhering fibers. In addition, the cover plate 10 can be adjusted or adjusted according to arrow 17. be extended according to the dashed line 16.

The invention also includes a vibrating plate which works here on the principle of a balance. It reacts to changes the air speed and gives impulses according to its deflection to a control motor 6, which in turn can set known intermediate units in function to the air speed and / or the number of revolutions of the sieve drum axis 8 regulate.

It is also essential to the invention that the alignment of the feed chute 1 is adjustable. Depending on the goods to be driven The decisive factor may be the angle at which the material enters the device.

In addition, the cover plate 10 can have a bulge in the area 11 and can then be continued in a radius of curvature as before up to point 13; a lift-off effect similar to that described above is thus achieved.

Even if the goods are separated in order to achieve a homogeneous fur, it is possible to separate the coarse and fine waste from the filter together.

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Claims (15)

1. Apparatus for filtering air using, for example of at least one screen drum working with negative pressure or subjected to overpressure, the outer surface of which Is covered with a fur made of pneumatically conveyed fibers or the like. And means for diverting of the fur » characterized in that the feed shaft (1) for the goods i.w. aligned tangentially to the screening drum (4) so in a curved sieve drum housing (9) merges that the effective gravity (inertia) of the heavy goods can be exploited that the sieve drum (4) can preferably be driven against the direction of insertion of the goods and that preferably below the sieve drum axis at least one known waste chamber (7), one Cell roller (2) or the like. Is arranged. 2. Device according to claim 1, characterized in that the arched sieve drum housing (9) is shaped at least in the area above the sieve drum (4) Iw a circular arc with an eccentrically arranged sieve drum, elliptical, parabolic or hyperbolic (the apex is above the axis (8) of the sieve drum) . 109815/0743 3. Device according to at least one of the preceding claims, characterized in that the feed shaft (1) approximately at the level (next to) the sieve drum axis (8) in the Sieve drum housing (9) opens. 4. Device according to at least one of the preceding claims, characterized by fixed air baffles arranged in the course of at least a part of the sieve drum shell, their distance from one another and / or from the screen drum shell and their alignment (inclination) adjustable is. 5. Device according to at least one of the preceding claims, characterized by a known per se in the circumferential direction the sieve drum adjustable and / or extendable inner cover plate (10). 6. Apparatus according to claim 51 characterized in that the cover plate (10) there has an outwardly pointing bend (11) at the free end shows where the good is to be lifted off. 7. Device according to one of claims 5 and 6, characterized by a known scraper (19) or the like assigned to the sieve drum (4) and an arrangement of the cover plate (10) so that it overlaps the free edge (12) of the scraper 19) in the direction of the running material. 109815/0743 8. Device according to at least one of the preceding claims, characterized by at least one pressure roller (18, 18a), a revolving belt or the like. In the lower sieve drum area. 9. Device according to at least one of the preceding claims, characterized by means for regulating the thickness of the fur, for example consisting of one of the fur tops Associated button, light beam with selenium cell or the like., ^ The amount of material supplied by air volume regulation controls and / or by regulating the number of sieve drum revolutions. 10.Vorrichtung according to at least one of the preceding claims, characterized in that the cross-sectional area of the feed chute (1) is greater than the free cross-sectional area between the sieve drum (4-) and the sieve drum housing (9) in the entry area of the feed shaft (1). 11. Device according to at least one of the preceding claims, characterized in that the cross-sectional area of the feed chute (1) is narrower (adjustable) in the mouth area than is in the area before it. 12. Device according to at least one of the preceding claims, characterized in that the waste chamber (7), the cellular roller (2) or the like below the screen drum axis (8) or is arranged laterally to it. 109815/07 A3 OWGIfWl. INSPECTBD 13. Device according to at least one of the preceding claims, characterized in that the feed chute (1) is adjustable in its alignment - at least in the mouth area is. 14. Device according to at least one of the preceding claims, characterized by means (e.g. two waste chambers, cellular roller or the like) for the separate removal of the e.g. light (fine) and heavy (coarse) good. 15. Device according to at least one of the preceding claims, characterized in that the feed damage (1) from below (tangentially) opens into the sieve drum housing at a distance from the sieve drum shell. 109815/07 /, 3