DE7512775U - DEVICE FOR THE LIMITING OF FOAM IN A LIQUID CONTAINER, WITH FOAM FLOATING ON A LIQUID, WITH CROSS TO THE LIQUID LEVEL OVER A DRIVE ARRANGEMENT ROTATABLE FOAM KNIFE OF THE FLOATING FLUIDS FOR THE MECHANICAL FLOWERS - Google Patents

Description

Dipl.-Ing. Manfred Bonsmann -. «'- d-4o5 Mönchengladbach

Patent attorney Beethovenstrasse 15

'S? (0216η 12114

_Date: April 21, 1975

My reference: MB / hb 74 179 a

Your sign:

Hubert Fuchs, 544 Mayen, Im Stockthal

Device for limiting foam when in a liquid container on a liquid floating foam with transverse to the liquid level via a drive arrangement rotatably arranged foam knife blades for the mechanical destruction of the foam bubbles

When processing liquids, the interaction with gases often causes foam to develop. This is particularly noticeable when - as is often the case - bacteria are brought to growth in the liquid and thereby larger amounts of protein are produced. To combat or limit foam formation are physico-chemical effective means known, which are based on fat. These substances are of good effectiveness, but they show various disadvantages. In the vast majority of all cases, for example, they created an additional pollution

Postal check Cologne 177123-506-Deutsche Bank AG Mönchengladbach 6234876 (bank code 31070001) -Stadtsparkasse Mönchengladbach 102985 (bank code 31050000)

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factor of the liquid or the water. Furthermore, they are only in high concentration in many cases effective and therefore uneconomical. They are also suitable for the exchange of oxygen between water and bacteria cells to represent a .törxaktor.

furthermore, suggestions have become known that arise to prevent or to mitigate with purely mechanical means, Dicre devices are mostly as Combined foam limiters and pumping stations formed.

You drer. an si .n around a vertically arranged axis and convey the brushed foam over an edge into a second container. In addition, devices of the type mentioned at the outset have become known in which foam man's wings are arranged so that they can rotate transversely to the liquid level or to the foam surface. Di ^ se arrangement has advantages over the known devices the advantage that du.ca the foam blade wings drops compressed c-chavus in an approximately semicircular plane down into the ochaum be hurled and thus substantially increase the effect length of the foam blade wing. Due to the vertical plane of the foam destruction and the spray effect that also acts deep into the foam, a gradient is created in the foam that allows it to flow into the destruction plane.

When operating this known device, however highlighted some disadvantages. So it is in some cases

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cur foam so stiff that the desired flow does not start by itself. when they get stuck on the foam knife wings, form imbalances and destroy the machines. Furthermore, there are sometimes unpleasant odors. Finally, the known device has the disadvantage that there is no adequate apron for the device against moist and / or aggressive gases which can be expelled from the water. Finally, problems arise in the sealing of the drive motor of the shaft of the foam knife blades from the foam. The usual sealing rings are easily infiltrated, torn and destroyed by hair, fibers, mineral sludge etc. The same problems arise when using the usual plain bearings.

The invention is based on the object of improving the known device so that the disadvantages described no longer occur.

To solve this problem it is initially provided according to the invention that the foam knife blades are set in a propeller-like manner . With this measure it is achieved that the foam is not - as before - only beat zer, but is sucked in at the same time. Except-

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the exhaust gas released from the foam is pushed away behind the foam knife level. The set can be adjusted accordingly the stiffness of the foam produced in each case at different levels, i.e. at different steep angles and with leaf surface of different widths can be used.

In order to prevent fibrous material from sticking to the foam cutter blades, a further feature of the invention provides that the foam cutter blades are designed in a spiral. In an expedient embodiment of this feature of the invention, it can be provided that the spiral curvature is selected according to the formula r = r J "f plotted in polar coordinates, where f is approximately between 180 ° and 310 °. With this measure, fibrous material is achieved cannot stick to the foam knife blades, but is thrown away as a result of centrifugal forces.

According to a further feature of the invention it is provided that the radius of the foam knife blades and the drive arrangement are dimensioned such that the peripheral speed the foam knife blade is less than 30 m / sec.

This measure is based on the following knowledge. In the operation of the foam knife blades there is a circumferential speed a critical speed. If this critical speed is exceeded, instead of one Foam compression creates additional foam. In addition, aerosol formation is rampant in this area.

According to a further feature of the invention it is provided

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that at a distance from the circumference of rotation, the foam knife wing ν at least in the area above the axis of rotation one after Type of a protective plate designed and downwardly open guide device is provided. This measure serves on the one hand, to concentrate the air flow created by the fan action of the foam knife blades in a directed manner. At the same time, the guide device serves as a splash guard. The lower semicircle between the water surface and drive housing can flow through freely.

To further support the foam flow it can be provided that the device is about a horizontal axis pivotable and \ n is arranged lockable at least several pivot positions. Thus, the device be hung in such a way that their air flow and the water flow are in the same direction and work together. Through this the foam flow is effectively supported.

When the controlled foaming, foam circulation and foam destruction often occurs so intense gas exchange processes in the foam, for example, that the oxygen present is consumed completely, or is driven off in the water existing carbonic acid at high concentrations. In order to keep the expelled gas, which is moist and / or aggressive, away from the drive device, it is provided according to a further feature of the invention that the drive device is a motor on the basis of which

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ienstumpf the ^ are attached chaumjiesserflügel; -nc the r-iotor a casing, and in at the urnmancelung a supply air duct ¹ JHD a Ab_uitleitun _a:.; are connected. The inlet grille of the motorized fan is supplied with fresh air from outside the exhaust zone via the supply air line. The heated cooling air is preferably discharged upwards via the exhaust air line at the output end of the motor.

In a further embodiment of the invention, provision can be made

lü be that in a liquid container provided with a cover, a discharge pipe pointing to practice is provided with buckets the outside diameter of the exhaust pipe exceeding inner diameter, and the exhaust pipe opens into the discharge pipe. This l-laBne ϊ lies

Ij, based on the following consideration. The fueled cooling air he ζ a st. r low water-saturation and a certain over-expensive y ; Compared to their surroundings, a ver-.ltnisffiä / ' ¹ . g low naumgewichx and thus a gev / isse, ^ cling ability. On the other hand, in many cases it is from the

2.U chaumniesserflU.ieln released exhaust gas from the foam low in oxygen consumption and saturated with wax, the riaunanme provided according to the invention serves to mix exhaust gas and cooling air :: can arise from the exhaust gas. As a result of ^ jektorwirkun _to the Kühlluxt is swirling and mixing

of the exhaust gas is achieved with the cooling air and, if necessary, additional fresh air.

In an expedient embodiment of this measure, it can also be provided that; 3 in the air supply line and / or an additional fan is provided for the exhaust air line. As a result, the ejector effect described is further intensified .

ώίη relates to another feature of the present invention a sealing arrangement for sealing the foam knife

lü wing bearing "shaft through the housing of the drive assembly or through the sheathing. The sealing rings used so far for this were made of hair, fibers, mineral mud etc. infiltrated, tattered and destroyed. The same phenomena occur when using of plain bearings. According to the invention, this disadvantage is to be remedied provided that the seal is arranged one on the foam knife blades and one is fixedly attached Has standing bushing in the manner of a labyrinth seal overlapping bushing, and within the standing bushing the wave from a helically wound spiral surface is surrounded. The seal according to the invention, which is a combination of a labyrinth, spiral and centrifugal seal represents, is in itself frictionless and has the advantage that in numerous cases from attaching itself Fibers an additional seal is built up automatically.

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In an expedient embodiment of this feature of the invention f

\ dung can also be provided that the stand socket |

I at one in one sufficient for air throughput | dimensioned distance to the housing of the drive assembly j voltage arranged flange is attached, and between the ■ An annular gap provided for the same air throughput is provided on the flange and the shaft.

An embodiment of the invention is based on the in the drawings schematically illustrated embodiment explained in more detail. Show it:

Fig. 1 is a schematic representation of the arrangement of the

device according to the invention for limiting foam in a liquid container;

Fig. 2 shows a schematic representation of the seal the "shaft supporting the foam knife blades" and the motor housing.

A liquid container 1 has foam 5 above the liquid 2. The container 1 is secured by means of a cover 4 covered. A drive motor 6 is attached to a lateral bracket on the container wall 1 in a casing 5, a "shaft 7 is passed through the housing to the outside, which is formed spirally at its front end Has foam knife blades 8. The arrangement is there such that the motor 6 is arranged horizontally, and therefore

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accordingly, the foam knife blades 8 are arranged vertically and immerse in the foam 3. The foam knife blades 8 are set in the manner of a propeller. The peripheral speed of the foam knife blades is selected so that it is not greater than 30 ia / sec. This can be achieved, for example, that a drive motor with a speed between 900 and 1000 rpm is selected, and the measuring blade wing one Have a maximum diameter of 50 cm. At a distance from the circumference of rotation of the foam knife blade 8 is at least in the area above the axis of rotation a guide device designed in the manner of a protective plate and open at the bottom 9 provided.

The arrangement described works in such a way that when rotated The foam knife blade smashes and compresses the foam, and drops the compressed foam in one approximately semicircular plane can be thrown down into the foam. By standing vertically Level of foam disruption and that deep into the foam an additional spray effect is created in the foam Favor that lets this flow into the plane of destruction. Due to the propeller-like twisting of the foam knife blades 8 it is achieved that the foam is not only smashed, but is sucked in at the same time and also behind the The foam knife blade 8 level is the one released from the foam 3 Exhaust is pushed away. It goes without saying that the twisting corresponds to the rigidity of the

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the ,:. ι. and sometimes at different heights, i.e. at different steepnesses Viinkel and formed with a leaf surface of different widths can be. In this way it is made possible, in contrast to the known devices with the

:> inventive device foam of any Ar ₁ ; to destroy. Because the foam knife flights! are formed spirally, it is achieved that fibrous material such as human hair, textile fibers, etc. cannot stick to the blades of the foam knife, form imbalances there and destroy the device. It is particularly useful if the spiral shape is formed according to the formula r = r. / Ψ plotted in polar coordinates, the angle P being between 150 and 310. The guide means 9 serves firstly as a splash guard and secondly to direct the emerging through the foam knife blades 3 flow of air down and the lower semi-circle between the liquid surface and the casing of the motor 6 free to flow through to ⁿ as s s.

Furthermore, it is provided that on the casing 5 of the Mo sector 6, a supply air line 10 and an exhaust air line 11 to closed is. The supply air line 10 closes with its lower end tightly with the motor fan, in such a way that that the supply air is only passed through the motor 6.

The air supply line is led to the outside through the housing 1 and is supplied with fresh air from there. Alternatively It can be provided that an additional fan 12 is arranged in the supply air line 10. The one from the engine heat

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Heated cooling air is removed through the exhaust air line 11. The arrangement is now such that the exhaust air line 11 opens into an upward-pointing discharge pipe 13, soft connects to the cover 4. The inside diameter of the discharge pipe 13 is much larger than the outer diameter of the discharge line 11. The This arrangement works as follows. The heated cooling air has a very low water saturation and a certain excess temperature, so in relation to their surroundings have a relatively low volume weight and thus a certain climbing ability. The other hand is in many Cut the exposed from the beech foam knife wings 3 Exhaust gas from the foam is low in oxygen and saturated with water. if odor nuisance from, for example, ammonia od. The like. Can arise from the exhaust gas, the exhaust gas and the cooling air can by means of the device according to the invention be mixed. This is done automatically by the ejector effect the cooling air flowing into the discharge pipe 13, the air flow of which is

2ü se 12 can be reinforced. In this way there is a turbulence and mixing of the exhaust gas with the K'lhiluft and possibly further fresh air.

In B ¹ Ig. 2, a seal is shown schematically, by means of which the shaft 7 is sealed at the front housing end 6a of the housing of the motor 6. This seal points

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a liner arranged on the foam knife blades 8 14, which overlaps a stationary socket 15 arranged in the manner of a labyrinth seal. The stand socket 15 is arranged on a flange 16 which is arranged at a distance from the motor housing 6a and from the shaft has an annular gap 18 provided for the same air throughput. The shaft 7 is helical of one wound spiral surface 19 surrounded. The arrangement is such that the shown part of the shaft 7 as an approach the knife wing 8 is formed, which is attached to the actual motor shaft 7a and there by means of a screw 20 is attached.

The function of the seal is as follows. Foam particles that may have penetrated as far as the motor housing 6a are removed by the spiral 19 moving along with the shaft 7 is transported to the outside. At the same time, foam particles are removed from the Spiral 19, which has dimensions corresponding to this, is thrown against the inner wall of the standing socket 15. Through the movement of the spiral and through the effect

2.0 one by the distance 17 and the annular gap 18 by passing, originating from the motor 6 the air flow, the particles oefördert up to the cutter-side end of the bushing 15, on the one hand by the drag effect of the spiral and anderersei 6 by the air stream. On the foam knife blades, this air flow with the foam particles is absorbed by the foam knife blades pointing from the foam blade blades in the direction of the motor and over the stand socket.

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running liner 14 deflected. The seal thus represents a combination of a labyrinth seal, a spiral seal and a centrifugal seal, which in itself is friction-free and in numerous cases creates an additional seal itself from attached fibers. Such a seal is ideally suited for foams with a water content of less than 50 % , since in practice there can be gap widths between the spiral 19 and the stand bushing 15 and between the stand bushing 15 and the bushing 14 on the order of 1 mm without that this reduces the sealing effect.

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Claims (1)

Hubert Fuchs, 544 Mayen, Im Stockthal Device for limiting foam when in a liquid container on a liquid floating foam with transverse to the liquid level via a drive arrangement rotatably arranged foam knife blades for the mechanical destruction of the foam bubbles Expectations ^Λ . Device for limiting foam in the case of foam floating on a liquid in a liquid container with foam knife blades arranged to be rotatable transversely to the liquid level via a drive arrangement zuj. Mechanical destruction of the foam bubbles, characterized in that the foam knife blades (8) are set in the manner of a propeller. 2. Apparatus according to claim 1, characterized in that the foam knife blades (8) formed spirally 7512775 12/4/75 are. ■ j. Device according to Claim 2, characterized in that the spiral curvature is selected in folar coordinates according to the formula r = r ../ γ , where ψ is between 130 and 310 °. 4. Device according to one of claims 1 to 3, characterized in that the radius of the foam knife blades (8) and -lie drive arrangement are dimensioned such that the ümiangsgeschwindigkeii: the Foam knife blade (B) is less than 30 m / sec. 5. Device according to one of claims 1 to 4, dadux'ch characterized in that at a distance from the circumference of rotation of the sole knife wing (t) at least in the region above the axis of rotation one in the manner of a protective plate designed downwardly open guide device (9) is provided. 6. Device according to one of claims 1 to 5, characterized characterized in that the device is pivotable about a horizontal axis and in at least several ;;. swiveling ^ O positions lockable arranged iot. 7. Device according to one of claims 1 to 6, characterized in that the drive device is a motor (6) on whose stub shaft (7) the foam knife blades {'<"■) are attached, and the motor (6) 7512775 ot.12.75 has a casing (5), and on the casing a supply air line (10) and an exhaust air line (11) are connected. 8. Apparatus according to claim 7, characterized in that provided with a cover (4) Liquid container (1) has an upwardly pointing discharge pipe (13) with an outer diameter of the Exhaust air line (11) exceeding inner diameter is provided, and the exhaust air line (11) opens into the discharge pipe (13). 9. Device, in particular according to one of the. Claims 1 to 8, in which the foam knife blades supporting and through the housing of the drive assembly or the casing guided shaft in the area of the passage through the housing or the casing a <=> Has seal, characterized in that the seal is one on the foam knife blades (8) angeord Nete and a stationary socket (15) in the manner of a labyrinth seal overlapping cylinder liner (14), and within the stand socket (15) the shaft (7) from a helically wound NEN spiral surface (19) is surrounded. 10. The device according to claim 9, characterized in that the stand socket (15) on one in one for a sufficiently dimensioned air flow 7512775 12/4/75 stand (7) to the housing (6a) of the drive assembly arranged flange (16) is attached, and between the flange (16) and the shaft (7) one for the same Air throughput provided annular gap (18) is provided. 7512775 04.1175