DE102007058494A1 - Liquid-aerosol i.e. lacquer-overspray, separating device, for use during painting has countersinks predominantly opened upward and closing downward at application condition, and passage openings arranged between countersinks - Google Patents

Abstract

The device i.e. (10), has a separating unit (25) with a set of countersinks (27) for collecting aerosols, where the countersinks are formed at a cup shaped separating body (24). The countersinks predominantly are opened upward and closed downward at an application condition. Passage openings (26) are arranged between countersinks. The passage openings are arranged in a region of a surface between the countersinks. The separating body is made from aluminum, plastic foil, elastic or hard plastic, ceramics, glass, cellulose and/or lignin.

Description

The The invention relates to a device for the dry separation of liquid aerosols, especially paint overspray, from a stream of air which over has at least one separation unit with passage openings for the air flow.

At the Painting, especially during spray painting, becomes an air flow which produces a painting area normally or at the Most systems flow from top to bottom and excess paint from the Lackierbereich dissipates. The paint droplets should be outside of the painting area again from the air stream, the painting system fed again will be disconnected. In the case of dry deposition, this occurs the use of liquids, as is the case with known air washers, for example, so that on a later, complex conditioning, especially drying, of the air flow and to a treatment of the water previously used for the deposition can be waived.

at known devices for the dry separation of aerosols, which are known as aerosol filters, sieves are made of the most diverse Materials used, the largest possible surface and smallest possible openings have to achieve optimal deposition. On the surfaces of the Sieves are bound to the aerosols. Small passages enable Although a high degree of separation for Aerosols. However, small openings are unfavorable for the passage of air, because the sieve so overall provides a considerable flow resistance. About that In addition, the passages clog the easier and easier faster, the smaller they are, which negatively affects the service life of such known screens. Larger passages extend although the service life and the flow resistance for the Airflow decreases. However, the degree of separation is also important worse than with smaller openings.

at known plastic fiber filters is the free cross section in the air flow direction viewed from the outside closer to the inside, so that the degree of separation increases. In the air flow direction front area, the coarse particles are deposited. In the back Area takes place a fine separation.

task The present invention is a device of the initially mentioned type to be designed so that with the lowest possible flow resistance for the Airflow and one possible long service life technically simple and efficient liquid aerosols can be separated from the air stream. The liquid aerosols include with the finest droplets from organic / inorganic paint components, which are available in different mixing ratios be firm and fluid can. The is called, The varnish consists of emulsified and suspended substances.

These Task is inventively characterized solved, that the separation unit has a plurality of depressions for collecting the Having aerosols, which are formed on at least one separation body and in the state of use mostly after open at the top and closed down, being between the valleys arranged the passage openings are.

According to the invention is thus a variety of sinks provided in the liquid aerosols from the air stream drain and where they are collected. The valleys have the advantage that they have a larger capacity for liquid aerosols have as other surfaces, where the liquid aerosols deposited only because of surface adhesion become. The on the surface separated and collected liquid aerosols sink due to gravity to the deepest parts of the valleys. The collected there Be liquid aerosols because of gravity held there, no longer get easily back in the airflow and can so do not clog the passages. This is extended the service life clearly opposite those of known from the prior art sieves with comparable Separation. In this way, given a size of passage openings, the for a low flow resistance Cheap is, even with long service life always an optimal degree of separation for the liquid aerosols reached.

at an advantageous embodiment the separation unit at least one layer of a plurality of separate bowl-shaped or trough-shaped separating bodies, while preserving gaps, the passages form, are arranged. trough shaped is in contrast to cup-shaped rather elongated. cup-shaped For example, above are open-plan vessels with round or square Cross-section, whereas at the top open vessels with rectangular or oval Cross section as a trough be designated. Such cup or trough-shaped separation body can be simple manufactured, for example, punched from films and molded. When dumping a layer fall such separation body due to gravity so that their closed sides are preferably down and theirs open sides are directed upwards.

In another advantageous embodiment, the separation unit comprises at least one separation body, which in a surface, the plurality of Sinks, wherein the passage openings are arranged in areas between the wells. In this way, the depressions can be realized in a single separating body, which can be easily separated from the device for emptying the depressions for cleaning purposes. In addition, the orientation of the depressions and the size and positioning of the passage openings can be precisely predefined and reproduced with such a separating body. The arrangement of the wells in a single solid Abscheidekörper is also stable to mechanical influences, such as shaking and vibration.

Around the largest possible area for To achieve catching of the aerosols, the sinks of the areas in the Condition of use viewed from above juxtaposed be.

Conveniently, can the area of the separator body wavy be, with the troughs realize the depressions and the passage openings in particular elongated Slits in the wave mountains are. Wavy Abscheidekörper can easily realized, in particular of sheets or plates bent or otherwise be formed. They are above In addition, at least in the direction of the troughs / wave crests stable in bending.

Further For example, a plurality of separation bodies in the use state can be stacked on top of each other be stacked. In this way, the airflow has several stages of separating bodies happen, which increases the overall separation efficiency of aerosols.

at a further advantageous embodiment, the passage openings two superimposed separation body arranged offset from each other. This has the big one Advantage that the air flow is not straight through the passages several successive Abscheidekörper can flow, but several times is diverted. this leads to to turbulence, which is favorable affects the degree of separation.

Around additionally the mechanical stability the separation unit can increase at Abscheidekörpern with wavy surfaces the orientation of the wave peaks of the superposed Abscheidekörper different be.

Conveniently, the orientation of the wave crests can be perpendicular to each other, which is particularly stable and easy to implement.

alternative can at Abscheidekörpern with wavy surfaces the wave crests of the superposed Abscheidekörper offset from each other be.

advantageously, the at least one separating body made of metal, in particular Aluminum, plastic, in particular plastic film, elastic or hard plastic, ceramic, glass, cellulose and / or ligninhaltigem Material or a mixture of these materials. Metal has the advantage that it is mechanically stable and yet easily deformed can be. Plastic parts are also simple and inexpensive for example, produced by spraying or thermal forming. collecting bodies made of ceramic and glass simply cleaned and so often be reused. About that In addition, ceramic and glass are resistant to acids, alkalis and other chemicals Substances.

Further can be a case be provided, in which the separation unit is housed and the at least one inlet and at least one outlet for the airflow having. In this way it is ensured that no aerosols get into the environment.

Further Advantages, features and details of the invention will become apparent the following description, in the embodiments of the invention closer to the drawing explained become; show it

1 schematically a vertical section of a liquid aerosol filter having a separation unit with cup-shaped Abscheidekörpern according to a first embodiment;

2 schematically in isometric view some of the cup-shaped separator body of the 1 ;

3 schematically in an isometric view trough-shaped separating body according to a second embodiment;

4 schematically in isometric view of a separation unit with a stack of Abscheidewellblechen according to a third embodiment.

In 1 is a total with the reference numeral 10 provided liquid aerosol filter shown in vertical section.

With the liquid aerosol filter 10 Paint droplets of a paint overspray are dry-deposited from an exhaust air stream of a paint shop. The airflow is in the 1 through arrows 12 indicated. It flows through the liquid aerosol filter 10 vertically from top to bottom.

The liquid aerosol filter 10 has a trough-shaped housing 14 which on his Top with a removable lid 16 is closed.

The lid 16 has a plurality of inlet openings 18 for the airflow 12 on.

A level floor 20 of the housing 14 has a plurality of outlet openings 22 for the airflow 12 on.

When used, installed in an exhaust duct of the paint shop, is the housing 14 aligned so that the ground 20 runs horizontally.

The floor 20 is covered with a layer of separate Abscheidäpfen 24 , which together form a first embodiment of a total with the reference numeral 25 provided Abscheidideeinheit for the paint droplets.

Some of these Abscheidäpfe 24 are in the 2 shown isometrically.

The Abscheidäpfe 24 have the form of halved hollow spheres. They are stamped and shaped from aluminum foil.

When pouring the Abscheidäpfe 24 in the case 14 Due to gravity, they fall in such a way that their opening points predominantly upwards. They sink in this way 27 ,

The hemispherical shape of the Abscheidäpfe 24 Ensures that when filling the layer between them sufficiently large gaps remain, which as passages 26 for the airflow 12 serve.

When operating the liquid aerosol filter 10 becomes the airflow 12 , which carries the paint droplets, from above through the inlet openings 18 of the lid 16 in the case 14 directed.

The paint droplets fall down due to gravity, are through the Abscheidäpfe 24 caught and in the valleys 27 collected.

The airflow 12 flows on the Abscheidäpfen 24 over and through the passages 26 therethrough.

The most purified of paint droplets airflow 12 escapes through the outlet openings 22 in the ground 20 of the housing 14 ,

Due to the large number of passage openings 26 the airflow happens 12 the layers of Abscheidenäpfen 24 with a low pressure loss.

With the liquid aerosol filter 10 is it possible the airflow 12 clean so far that it exits the aerosol filter 10 has a particle content of well below 1 mg / m ³ air.

Once the absorption capacity of the liquid aerosol filter 10 is exhausted, so the sinks 27 are filled with paint droplets, is the aerosol filter 10 regenerated.

For this purpose, the Abscheidäpfe 24 after opening the lid 16 the housing 14 taken and the sinks 27 emptied. The empty Abscheidäpfe 24 are then back in the case 14 poured and the lid 16 closed, leaving the aerosol filter 10 is ready for use again.

In the 3 are some elongated Abscheidetröge 124 shown which alternative to the Abscheidenäpfen 24 arranged in a position a separation unit 125 form according to a second embodiment. The separation unit 125 according to the second embodiment is to the separation unit 25 according to the first embodiment 1 similar in structure and function.

The separation trays 124 are also formed of aluminum foil and form analogous to the Abscheidenäpfen 24 Reduce 127 for collecting and collecting the paint droplets from the air stream 12 ,

The separation trays 124 have roughly the shape of the surfaces of flat truncated pyramids with rectangular bases, with the large bases of the truncated pyramids sides of the Abscheidetröge 124 are open.

The bottoms of the separation trays 124 correspond to the small cut surfaces of the truncated pyramids.

When pouring into the housing 14 the separation trays are directed 124 preferably with their bottoms down.

As a result, the bottoms of the separation trays 124 are just standing, the Abscheidetröge 24 stable on the ground 20 of the housing 14 ,

The pyramidal shape of the separation trays 124 gives the sinks 127 a funnel shape, which has a favorable effect on the collection of paint droplets.

In the 4 is a stack of separation corrugated sheets 224 shown, the third embodiment of a separation unit 225 that forms the separator units 25 and 125 from the first and the second embodiment ( 1 and 2 respectively 3 ) in Struk is similar in function and function.

The troughs 227 the separation corrugated sheets 224 run parallel to each other and form analogous to the Abscheidetrögen 124 and the Abscheidäpfen 24 Lowering to collect the paint droplets.

The separation corrugated sheets 224 are in the condition of use, oriented so that the bottomed troughs of the troughs 227 extend substantially horizontally. The airflow 12 so flows the Abscheidewellbleche 224 perpendicular to the troughs 227 at. The troughs 227 are thus arranged in the use state viewed from above side by side, so that the largest possible area for collecting the paint droplets is realized.

The crests of the wave mountains 228 parallel to the bottoms of the troughs 227 ,

Every separation corrugated sheet 224 is with a square in plan view peripheral wall 230 border. The peripheral wall 230 towers over the wave mountains 228 ,

Two parallel first wall parts 230a the peripheral wall 230 extend perpendicular to the troughs 227 , The wall parts 230a close the troughs 227 at the perpendicular to these opposite edges of the Abscheidewellblechs 224 ,

The in the 4 lower edges of the first wall parts 230a are according to the profile of the separation corrugated sheets 224 wavy, so that the local edges of Abscheidewellbleche 224 close to the lower edges of the first wall parts 230a nudge.

Two parallel second wall parts 230b the peripheral wall 230 connect the first wall parts 230a close to their ends. With their lower edges abut the second wall parts 230b close to the edges of the bottoms of the outer troughs 227a on, which are only half formed. The second wall parts 230b thus form the boundary of the outer troughs 227a ,

The crests of the wave mountains 228 each have a plurality of oval passage openings 226 for the airflow 12 whose longitudinal directions are parallel to the crests.

In the 4 are three separation corrugated sheets 224 shown, which are stacked one above the other so that the lower edge of the peripheral wall 230 a respective upper separating corrugated sheet 224 on the upper edge of the peripheral wall 230 a respective lower Abscheidewellblechs 224 seated and the outer contours of the two peripheral walls 230 aligned.

That in the 4 upper separating corrugated sheet 224 is shown for the sake of clarity only partially.

Every separation corrugated sheet 224 is in each case opposite the underlying or the overlying separating wave sheet 224 parallel to the through the bottoms of the troughs 227 spanned plane, which runs horizontally in the state of use, rotated by 90 °. The troughs 227 stacked separating corrugated sheets 224 thus run perpendicular to each other.

This causes the passage openings 226 the superimposed separating corrugated sheets 224 When viewed in the vertical direction, they are offset relative to one another. The airflow 12 so it is between the separation corrugated sheets 224 deflected and swirled, which increases the degree of separation of the paint droplets.

Once in operation of the liquid aerosol filter 10 the troughs 227 with paint droplets are full, the Abscheidewellbleche 224 easy out of the case 14 removed, emptied and cleaned. The so easily and quickly regenerated Abscheidewellbleche 224 Just be back in the case 14 inserted, leaving the liquid aerosol filter 10 ready for use.

In all embodiments of a separation unit described above 25 ; 125 ; 225 a liquid aerosol filter 10 Among others, the following modifications are possible:
The invention is not limited to the deposition of paint droplets of a paint overspray from an exhaust air stream 12 a paint shop. Rather, it can be deposited dry with it also different types of liquid aerosols from air or other gas streams without the addition of washing liquids.

The airflow 12 Can the liquid aerosol filter 10 Instead of flowing vertically from top to bottom in the opposite direction or horizontally or at any angle. The main air flow in the liquid aerosol filter 10 In this case, it preferably runs essentially in the direction of the depressions 27 ; 127 ; 227 wherein the paint droplets adhering to the filter surface drip into the depressions 27 ; 127 ; 227 is possible.

Instead of the spherical Abscheidäpfe 24 and the truncated pyramidal separation trays 124 can also different types of depressions forming, for example, channel-shaped, separating bodies are used, which while retaining gaps due to gravity so that their closed sides are preferably pointing downwards.

Instead of just one layer of separation bodies 24 or separation trays 124 can also be provided a variety of layers.

The separation corrugated sheets 224 can also be stacked so that their troughs 227 parallel to each other, preferably the passage openings 226 two superposed separating corrugated sheets 224 offset from each other.

The troughs the Abscheidewellbleche can in profile instead of rounded also angular, for example triangular or rectangular.

There may also be more or less than three Abscheidewellbleche 224 be provided.

On the perimeter walls 230 the separation corrugated sheets 224 can also be dispensed with, if the Abscheidewellbleche 224 fitting into the housing 14 are installed.

The Abscheidäpfe 24 , the separation trays 124 and the separation corrugated sheets 224 may be instead of aluminum foil from another dimensionally stable material, for example, plastic, in particular plastic film, elastic or hard plastic, ceramic, glass, cellulose and / or lignin-containing material or a mixture of different materials.

So far small-piece separate separation body can be used these also on a conveyor system, the self permeable to air is through the case of the liquid aerosol filter be conducted continuously or intermittently. That way is a regeneration of the liquid aerosol filter possible without interruption.

Claims (12)

Contraption ( 10 ) for the dry separation of liquid aerosols, in particular paint overspray, from an air stream ( 12 ), which via at least one separation unit ( 25 ; 125 ; 225 ) with passages ( 26 ; 126 ; 226 ) for the air flow ( 12 ), characterized in that the separation unit ( 25 ; 125 ; 225 ) a variety of sinks ( 27 ; 127 ; 227 ) for collecting the aerosols which are attached to at least one separation body ( 24 ; 124 ; 224 ) are formed and which are in use state predominantly open at the top and closed down, wherein between the sinks ( 27 ; 127 ; 227 ) the passage openings ( 26 ; 126 ; 226 ) are arranged. Apparatus according to claim 1, characterized in that the separation unit ( 25 ; 125 ) at least one layer of a plurality of separate cup or trough-shaped separating bodies ( 24 ; 124 ), while maintaining gaps, which the passages ( 26 ; 126 ) are arranged. Apparatus according to claim 1, characterized in that the separation unit ( 225 ) at least one separation body ( 224 ), which in one area the plurality of sinks ( 227 ), wherein the passage openings ( 226 ) in areas of the area between the depressions ( 227 ) are arranged. Apparatus according to claim 3, characterized in that the sinks ( 227 ) are juxtaposed in the surface in the use state viewed from above. Apparatus according to claim 3 or 4, characterized in that the surface of the Abscheidekörpers ( 224 ) is undulating, the troughs ( 227 ) realize the depressions and the passage openings ( 226 ) are elongated slots in the wave crests. Device according to one of claims 3 to 5, characterized in that a plurality of Abscheidekörpern ( 224 ) is stacked in the use state one above the other. Apparatus according to claim 6, characterized in that the passage openings ( 226 ) of two superposed Abscheidekörper ( 224 ) are arranged offset from each other. Apparatus according to claim 6 or 7, characterized in that in Abscheidekörpern ( 224 ) with wavy surfaces the orientation of the wave crests ( 228 ) of the superposed Abscheidekörper ( 224 ) is different. Device according to claim 8, characterized in that the orientation of the wave crests ( 228 ) is perpendicular to each other. Device according to claim 6 or 7, characterized that at Abscheidekörpern with wavy surfaces the wave crests of the superposed Abscheidekörper each other are offset. Device according to one of the preceding claims, characterized in that the at least one separation body ( 24 ; 124 ; 224 ) made of metal, in particular aluminum, plastic, in particular plastic film, elastic or hard plastic, ceramic, glass, cellulose and / or ligninhaltigem Ma material or a mixture of these materials. Device according to one of the preceding claims, characterized by a housing ( 14 ), in which the separation unit ( 25 ; 125 ; 225 ) and that at least one inlet ( 18 ) and at least one outlet ( 22 ) for the air flow ( 12 ) having.