DE102020007907A1 - filter system - Google Patents

Abstract

Filter system, which has at least four modules for air filtration, whereby this system• has at least one pre-filtering module, which serves to remove dust and dirt particles,• has at least UV-C radiation module, which kills viruses, bacteria and germs,• at least one electrostatic filter system (as a Module) which serves to separate fine dust and aerosols and• has at least one activated carbon filter module which filters out odors and gaseous pollutants.

Description

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The present invention relates to a filter system

Air purification systems or air circulation systems are currently facing major challenges. Particular attention is paid to throughput capacity, component size and low heating. In the filter systems available in the prior art, the air to be cleaned is sucked in and passed through a mechanical pre-filter. Here the coarse dirt particles are removed. Then mostly electrostatic filters are used. With these, the particles in the intake air are electrically charged by an ionizer. These particles are now charge carriers and are attracted by oppositely charged collector plates. The particles now stick to these plates and are disposed of depending on their state of aggregation. The liquid particles flow over the arc of the housing into a tank. The solid particles are also collected in a container. These filters require a lot of cleaning and are very expensive because they get dirty quickly and then have to be serviced. Furthermore, other very small particles are not captured by the filter system and removed from the air flow. Bacteria and viruses, now more than ever, are no longer wanted in indoor air. They should also be removed and if necessary killed to reduce any danger they pose. This feature is particularly important during the corona pandemic, but also in general when there is a high virus, bacteria and germ load.

It is therefore the object of the present invention to provide an air cleaning system which improves the present air cleaning systems.

This object is achieved by a filter system, which has at least four modules for air filtration, this system having at least one pre-filtering module, which is used to remove dust and dirt particles, has at least one electrostatic filter system, which is used to separate fine dust and aerosols, at least UV-C Has radiation module, which kills viruses, bacteria and germs and has at least one activated carbon filter module, which filters out odors and gaseous pollutants.

The pre-filter module can be a close-meshed grid or a fleece. It acts like a sieve and catches coarse dirt particles. The defined, uniform pore size is designed in such a way that hair, dander, large fluff, dust particles, insects and other coarse substances are removed from the air flow. As a result, they no longer reach the subsequent filter modules, so that exposure to these particles cannot take place.

The UV-C radiation module is used to disinfect the sucked-in air. Disinfection is understood as meaning the removal or even the sterilization and/or killing of pathogenic microorganisms by physical or chemical methods. Microorganisms include bacteria, mold, yeast, viruses and spores. These organisms are largely killed when irradiated in a wavelength range between 240 - 280 nm. This means that after the air flow has passed through these two modules described above, namely the pre-filtering module and the UV-C radiation module, there are no coarse particles and hardly any living organisms in the air flow. The current situation has now also shown in repeated research that the corona virus is also killed by radiation. The UV light destroys molecular components including the DNA of the organism. Studies have shown that irradiating contaminated material with UV light with a wavelength of 280-100 nm left it 99% virus-free. The duration of the irradiation was 6 seconds. A longer exposure time increased the effect up to 99.9999%. This underlines the need to use a UV-C radiation module to eliminate the organisms.

The third module, the electrostatic precipitator module, is based on the fundamental idea that charged particles are attracted by a plate that is charged in opposite polarity. In this way, particles can be removed from the air flow. The particles can be charged using a so-called discharge electrode. This accelerates the free electrons in the air flow (gas), which in turn generate new free electrons when they hit other molecules or attach themselves to the molecules. These molecules are now charged and are accelerated in the direction of the oppositely charged plate (collecting electrode). The precise way in which dust particles are charged via field charging or diffusion charging has been scientifically examined in great detail and is therefore known. After the charged particles have migrated to the collecting electrode, they release their charge there. They still stick to the precipitation electrode and form a layer of dust there that has to be cleaned off at regular intervals. The particles have consequently been removed from the air flow.

The activated carbon filter module filters unpleasant odors and gaseous substances out of the air flow. Due to the very large inner surface of the activated carbon, even the smallest dissolved particles are adsorbed. In addition, the carbon acts as a reducing agent and can absorb substances such as ozone and chlorine or other oxidizing agents, reduce them and in turn convert them into other substances.

The air flow should now be free of all relevant substances and gases so that the treated and cleaned air can be released again. Among other things, this prevents the main transmission path for SARS-CoV-2, which is known to bring the virus to the host via the respiratory system. Particles such as droplets and aerosols that are exhaled and spread in the air when breathing, speaking, singing and sneezing are eliminated by the filter system according to the invention. The room air should be completely exchanged or cleaned at least 6 times per hour to effectively prevent infections.

In a special embodiment of the invention, this is characterized in that the modules are designed to be exchangeable. The individual modules are available separately as individual components/assemblies and can be arranged as required. The individual components/assemblies are arranged in their own frame systems, for example screwed or plugged in. The frame systems with the individual filter modules, i.e. the pre-filter module, the UV-C radiation module, the electrostatic filter system module and the activated carbon filter module, are designed in such a way that they can be arranged and fixed interchangeably with one another. It is therefore a carefully thought-out modular or modular system. This makes it easier to adapt the filter system according to the invention to the spatial conditions. In addition, transport, manufacture, maintenance and much more is made easier. For example, an arrangement can have the air inlet with pre-filter module at floor level, on which the electrostatic precipitator system is then placed. The UV-C radiation module is located on the electrostatic filter system. The activated carbon filter module is located above it. The air outlet can be found on top of the filter system and of course the fans that suck in the air flow through the air inlet (below) and expel it to the outside. This embodiment of the invention in this arrangement draws in the air near the ground. Of course, this is where the heavier contaminated air particles and aerosols will be found. These are cleaned in the pre-filter. The air flow that then reaches the electronic module is also exposed to the ozone that inevitably forms when the electrostatic precipitator system is operated as a result of the charging and ionization of the particles. Ozone is an oxidizing agent and therefore already has a disinfecting (toxic) effect on organisms. The shielding during operation of the air filter system naturally takes this into account. No ozone can escape. The reducing power of the carbon in the active filter module converts the remaining ozone into oxygen. This is followed by air purification by the UV-C radiation module. It also applies here that the module is shielded during operation in such a way that no UV radiation penetrates to the outside. In an air rest zone with the activated carbon filter module, the air, which has now been completely cleaned and processed after passing through these zones, is expelled again through the outlet at a height of, for example, around 2000 mm. The cleaned air is therefore at head height and is inhaled there.

Another likewise preferred embodiment of the invention sucks in the air at the top, ie at head height, in order to reach the ejected contaminated aerosols directly, cleans the air and, after flowing through the modules, releases it again in the lowest module. There, the lighter air rises, so that a constant flow of air stimulates air circulation.

The number of the respective filter modules can also be adjusted. If several activated carbon filter modules are required, just add another one. Of course, this also applies to the other modules. The filter system according to the invention thus masters any air pollution; there is even the possibility of adding other filters and filter systems, such as a HEPA filter.

In a further embodiment of the invention, the filter system, which has a modular structure and is arranged in a frame system, is characterized in that exchangeable cover plates are attached to the frame system. These cover plates are easily removable and allow access to the technical inner workings of the filter for maintenance, repair or other purposes. This also offers the possibility of adapting the appearance of the filter to the existing device. The filter is no longer a foreign object in the room. The cover plates can be attached to the frame system by means of a plug, clip, strip or magnet mechanism. Easy handling and quick installation are important here. The size of the cover plates is adapted to the component size. In the one shown below 1 3 cover plates can be seen on each of the 4 sides, which are closed by a square cover. This gives the filter cabinet an aesthetically cubic appearance and attractive design.

In a very special embodiment of the invention, the space around the filter system is limited by air curtains or air bulkhead systems. An air curtain is a device that uses fans to separate differently conditioned air masses from one another. In other words, air masses that have different temperatures or different amounts of foreign matter. This delimitation by air curtains thus creates its own closed rooms, the "walls" of which are transparent but not permeable. The subdivision into smaller rooms makes this embodiment attractive for outdoor facilities and rooms that need to be subdivided. Outdoor facilities can use this to delimit small, perhaps even heated areas in which groups can be found. For example, outdoor smoking rooms or the like. Large rooms, halls that are not intended to be used in their entirety, but which should nevertheless be seen in their optics and splendor, can be made smaller by cleverly placed air curtain arrangements. This of course increases the throughput of the cleaned air many times over.

• 1 schematisch, Grundaufbau Luftreinigungssystems
• 2 schematisch, Grundaufbau Aussenanlagenfiltersystem
• 3 schematisch, Grundaufbau FT-Deckenfilter
• 4 Schematisch Lamellenkamm
• 5 Erdungsbaugruppe

In the following, non-limiting embodiments of the present invention are discussed with reference to the drawing. In this show:

• 1 schematic, basic structure of air purification system
• 2 Schematic, basic structure of outdoor system filter system
• 3 schematic, basic structure FT ceiling filter
• 4 Schematic laminar comb
• 5 ground assembly

Reference List

1

Filter system, air purification system

2

cube above

3

cube center

4

cube below

5

fairing, below

6

fairing, center

7

disguise, above

8th

ejection element

9

fan

10

electrostatic precipitator module

11

UV-C radiation module

1 shows schematically the basic structure of the air purification system.

Here the 4 functional modules are easy to see, from which the air purification system 1, here in the form of a cabinet filter 1 can be constructed. the 1 corresponds to the design drawing adapted for this font. The cabinet filter 1 according to the invention is shown several times in this figure. On the far left you can see the cabinet filter 1 in its entirety with the attached panels (coverings) 5, 6, 7. It is therefore an external view. A small picture of the cabinet filter 1 as seen by an observer looking from the top left has been inserted at the bottom right. A comparison of these two views shows that the cabinet filter 1 in this embodiment (seen from the outside) consists of 3 cubes that are placed one on top of the other. The cubes are each 712 millimeters high. The cover on the top cube is placed with its surface about 130 mm away from the top cube. There is a gap between the cubes and the cover. The cubes themselves are 560 millimeters wide. Together with the external panels 5, 6, 7 (cladding) they are 688 millimeters wide.

The schematic drawing next to it, ie the second figure from the left, shows the cabinet filter 1 after removing the cover 5, 6, 7 and through the wall. A view of the inner workings of the filter is possible. Under the cover on top of the cabinet filter 1 you can clearly see the circular recesses from which the air is expelled. Up to three ejection elements 8 can be arranged on each side of the cabinet filter 1 . In this exemplary embodiment, however, there are only exactly three on one side, that is to say exactly 3 recesses. In this case, the radial fans 9 with backward-curved blades are used for this purpose, which operate with suction on one side. It has proven to be advantageous to have the additionally required components, which are necessary for functional assembly, manufactured by the respective device manufacturer. Radial modules, ie fans 9 that are ready to be installed and ready for use, can be obtained in a suitable housing from specialist shops for industrial needs. The fan units are shown schematically below the openings.

In this figure, the airflow is from bottom to top. The air thus first passes through the pre-filter module, followed by the electrostatic filter system 10, then the UV-C radiation module 11 and finally the activated carbon filter 12. The pre-filter module here is a close-meshed grid. Its sieve-like effect catches the coarse dirt particles at an early stage. It has a defined uniform pore size, which is such that hair, dander, large lint, dust particles, insects and other coarse materials are removed from the air flow. As a result, they no longer reach the subsequent filter modules, so that exposure to these particles cannot take place.

The particles, cell residues, fine dust and aerosols still present in the air flow are bound by electrostatic filters 10 . The particles charged by a discharge electrode are attracted to a plate charged with opposite polarity. After the charged particles have migrated to the collecting electrode, they release their charge there. They still stick to the precipitation electrode and form a layer of dust there that has to be cleaned off at regular intervals. Most of the particles have consequently been removed from the air flow.

The UV-C radiation module 11, which is arranged in the upper but also in the middle cube 2, 3, is used to disinfect the air sucked in. Microorganisms such as bacteria, mould, yeast, viruses and spores are killed in a wavelength range between 240 - 280 nm. The UV-C emitters are also not harmless to humans, which is why they are hidden behind the walls of the cabinet filter 1, which are impenetrable to the radiation. In this embodiment of the inventive filter system, 6 UV-C units are mounted in the top and middle cubes. They are arranged in such a way that they completely illuminate and radiate through the air mass flowing past. With a radiation duration of a few seconds, more than 99% of the air flow is freed from living microorganisms, since the radiation destroys the cell material, including the DNA.

The activated carbon filter module filters unpleasant odors and gaseous substances out of the air flow. Due to the very large inner surface, even the smallest dissolved particles are adsorbed. In addition, the carbon acts as a reducing agent and can absorb substances such as ozone and chlorine or other oxidizing agents, reduce them and convert them into other substances.

The other drawings, the third from the left and the fourth from the left, show the dimensions and geometrical conditions of the frame system and the suspension mechanism. Below right you can see the cabinet in its entirety. There is also a view from above.

• 1. Stufe: Grobfilter (Vorfilter) zum Zurückhalten großer Gegenstände wie Kunststoffabfälle, Zigarettenstummel, Laub, größere Insekten.
• 2. Stufe: Elektrofilter 10 zur Abscheidung von Partikeln und Aerosolen im Bereich von unter 1 µm bis 10 µm. Der elektrostatische Staubabscheider ist zweistufig aufgebaut: In der Ionisationseinheit wird ein starkes elektrostatisches Feld erzeugt. Die Ladungsträger (Elektronen und Ionen) lagern sich an die in der Luft enthaltenen Partikel und Aerosole an und laden diese so positiv oder negativ auf. Anschließend gelangt die Luft mit den geladenen Partikeln und Aerosolen zur Kollektoreinheit, in dem sich ein elektrostatisches Feld befindet. Dort werden die festen und flüssigen Teilchen gemäß ihrer Ladung abgelenkt und lagern sich an der entsprechend entgegengesetzt geladenen Kollektorplatte ab.
• 3. Stufe: Aktivkohlefilter zur Entfernung von gasförmigen Schadstoffen (also auch Stickoxide) und Gerüchen.
• 3.1 Ventilator 9. Hinter diesem teilt sich der Luftstrom in 2 Teile, wobei ein Teil in der Luftschleiereinheit verwendet und der andere in der UV-C Einheit 11 gesäubert und genutzt wird.
• 3.1a Luft für Schleier. Durch diese im Filtersystem eingebaute Vorrichtung wird der Luftschleier erzeugt. Er ist auf die geometrischen Gegebenheiten ausgerichtet und sorgt für einen optimal zu belüftenden Raum.
• 3.1b Luft für die UV-C Einheit 11.
• 4. Stufe: Sterilisationskammer zum Abtöten von Keimen, Bakterien und Viren mit Hilfe von Ozon und UV-C-Licht. Diese vierte Stufe besteht aus einer Kammer, die mit UV-C-Quellen bestückt ist, um, die in der durchströmenden Luft befindlichen, Keime abzutöten. UV-C Licht ist Licht in einem Wellenlängenbereich von 254 nm und sehr energiereich. Es zerstört bzw. inaktiviert verschiedene Keime (Bakterien, Viren, Sporen) und wird nach dem Stand der Technik u.a. zur Trinkwasserreinigung oder Desinfektion von öffentlichen Verkehrsmitteln und Krankenhäusern verwendet.

2 Schematic, basic structure of outdoor system filter system or waiting area. Here you can clearly see the individual filter stages. They are defined as follows (some facts are only repeated for the sake of completeness. This is to be understood purely as a supplement and clarified by explanations) :

• 1st stage: Coarse filter (pre-filter) to retain large objects such as plastic waste, cigarette butts, leaves, larger insects.
• 2nd stage: electrostatic precipitator 10 for separating particles and aerosols in the range from less than 1 μm to 10 μm. The electrostatic dust separator has a two-stage structure: A strong electrostatic field is generated in the ionization unit. The charge carriers (electrons and ions) accumulate on the particles and aerosols contained in the air and thus charge them positively or negatively. The air with the charged particles and aerosols then reaches the collector unit, which contains an electrostatic field. There, the solid and liquid particles are deflected according to their charge and are deposited on the correspondingly oppositely charged collector plate.
• 3rd stage: Activated carbon filter to remove gaseous pollutants (including nitrogen oxides) and odours.
• 3.1 Fan 9. Behind this, the air flow splits into 2 parts, one part being used in the air curtain unit and the other being cleaned and used in the UV-C unit 11.
• 3.1a air for veils. The air curtain is created by this device built into the filter system. It is geared to the geometric conditions and ensures a room that can be optimally ventilated.
• 3.1b air for the UV-C unit 11.
• 4th stage: Sterilization chamber for killing germs, bacteria and viruses with the help of ozone and UV-C light. This fourth stage consists of a chamber equipped with UV-C sources to kill germs in the air flowing through. UV-C light is light in a wavelength range of 254 nm and is very high in energy. It destroys or inactivates various germs (bacteria, viruses, spores) and, according to the state of the art, is used, among other things, to purify drinking water or disinfect public transport and hospitals.

Appropriate air flow and optimal outlet devices to be developed ensure that the flow rate is reduced to a level that is comfortable for those waiting. The cleaned air can also be enriched with aromas and beneficial scents, which further improve the well-being of the body, soul and spirit of the people in the fresh air cell. Furthermore, the technology or the aroma additive can be used in the retail sector to stimulate purchases set (including sponsoring or as an advertising measure).

By using the air curtain system, the room is delimited laterally without having a physical side wall. As a result, the room is optically unlimited and prevents the impression of being enclosed: At the same time, a clearly defined demarcation from the uncleaned ambient air is achieved. The air required for the air curtain consists of 100% cleaned air. The space delimited by the air curtains is slightly over-pressurised, which minimizes mixing with the outside air. At the same time, people are no longer structurally separated from the general public (similar to the smoking cabin) in order to breathe fresh, clean air. The waiting person does not have to enter a closed room, which is often associated with an increased risk of infection

With the mobile air cleaning system for four-stage cleaning of ambient air, an efficient filter unit will be available with which e.g. B. in public areas with a high number of people, in places with high fine dust, nitrogen oxide and / or germs, the air can be cleaned efficiently and environmentally friendly. Due to the simple and easy structure of the system, the air purification system can be set up at pollution hotspots within a short time and with little effort and put into operation as a fresh air station. Preferred areas of application are heavily frequented waiting, training or catering areas as well as various zones at cultural events (concerts, theatres, museums, conferences, ...).

Another variant of the mobile air purification system does without the air curtain and the roof. It is to be developed in parallel. They are to be installed in mobile, partly room-high units, for example to keep the air in schools and catering areas clean during COVID-19 and to minimize the risk of infection. The number of shock ventilations can be reduced, which reduces heating costs and thus the ecological footprint.

The state of the art for cleaning the air from particles and aerosols mainly includes two different technologies - the fabric filter on the one hand and the electrostatic dust separator on the other.

Fabric filters are very simple in terms of their functional principle: A membrane or mat made of fabric, felt or similar material lies in the gas flow. The particles and aerosols larger than the gas permeable pores of the membrane or mat are trapped or adhere to. The cleaned air flows through the pores. Over time, the pores become clogged with separated particles and deposits form on the surface of the filter material, the filter cake. As a result, particles with a smaller diameter than the pore size can also be separated during the use of the filter. The pressure drop across these membranes or mats is relatively high and increases sharply with the degree of contamination because the trapped particles narrow or clog the pores. The membranes or mats can be cleaned to a certain extent by beating them out or removing the particles from the membrane or mat again using compressed air blasts or a countercurrent flow. In the long term, however, the membrane or mat has to be renewed again and again. This results in regular costs for buying new and disposing of the loaded filter mats.

Electrostatic dust separators are technically more complex. They have already been described in a similar way above. They consist of electrodes and collector plates for the accumulation of the particles to be separated, which form channels through which the gas to be cleaned flows. Positive or negative voltage is applied to the electrodes, while the collector plates are grounded and thus act as an oppositely charged pole. This creates strong electrostatic fields in the lanes, the particles are electrostatically charged and then accumulate on the oppositely charged electrodes. The electrostatic fields are generated with a high voltage source. In contrast to the classic cleaning method of tapping or rinsing with water, the electrodes in the newly developed filter are cleaned by brushing. For this purpose, a brush head (similar to a lamellar comb) is installed on the electrostatic precipitator. With this, the electrostatic precipitator is cleaned automatically or manually according to customer requirements after a certain period of time, which an indicator shows optically and/or acoustically. This cleaning removes the separated particles from the collector plates and can be disposed of. This waste is harmless to health and has been proven not to contain any pollutants in concentrations higher than those permitted by law for general waste.

Due to the open structure, the dimensions of which are orders of magnitude greater than the grain size of the particles or aerosols to be separated, there is only a very small pressure drop. This means that the ventilation technology used requires relatively little power. In addition, the pressure drop is, in principle, independent of the degree of contamination of the dust separator, unlike with bag filters. The service life of an electrostatic dust collector is not systematic cal limits and there is no systematic grain size limit for the separability.

Fine dust (English "particulate matter" - PM) is part of the suspended dust and is usually not visible to the naked eye. The complex mix of solid and liquid particles in ambient air is commonly described as PM2.5 and PM10. These particles, which are smaller than 10 microns (PM10) or even smaller than 2.5 microns (PM2.5), are particularly dangerous because they can penetrate deep into the pulmonary system. Typical man-made sources of PM pollutants are combustion processes, industrial exhaust gases, road traffic (vehicle exhaust, tire and road abrasion), construction activities and agriculture. However, particulate matter is also produced by natural processes, e.g. by volcanic eruptions, oceans, forest and bush fires and biological processes (e.g. release of spores and pollen).

Volatile organic compounds (VOC) are a complex group of gaseous pollutants of organic origin that are released from solids and liquids. Typical sources of volatile organic compounds are a large number of regularly used products such as paints and varnishes, cleaning agents, building materials, cosmetics, pesticides and many more. They are also released in the event of incomplete combustion and various biological processes (rotting, plant metabolism, ...). VOCs trigger various harmful effects, especially of course at high concentrations. The odor nuisance is often perceived as particularly annoying.

These are primarily bacteria, viruses and fungal spores, but also skin flakes and saliva from humans or animals. There are many sources such as trash cans, pets, HVAC systems, kitchens, dangerous microorganisms in hospitals, etc.

The filter thus improves the (room) air quality by filtering solid impurities, separating gaseous pollutants and neutralizing all harmful microorganisms.

The solution for a waiting area should be that we create an invisibly delimited space - the fresh air cell - with the help of air curtains and a slight overpressure. Air is mostly sucked in from the environment and partly also from the fresh air cell and cleaned of dust, aerosols and other ingredients by the air cleaning system. As a result, on the one hand, polluted ambient air is adapted to the quality requirements of the fresh air cell. On the other hand, pollution generated in the cell, e.g. from the breathing air of people staying in the cell, is also removed.

The WHO guideline defines the limit value for PM10 as a 24-hour average at 500 g/m ³ . According to the 39th ordinance for the implementation of the Federal Immission Control Act (39th BlmSchV), this concentration may not be exceeded more than 35 times a year in Germany. At the same time, the 39th BImSchV sets an absolute limit value of 40□ g/m ³ for PM10. In principle, these limit values apply to outdoor concentrations. Measurements at subway stations have shown; that the concentrations there are many times higher. The high values are due to the underground location and the limited exchange of air with the environment. Sources of particles and gaseous pollutants are brake dust from the subway, dirt particles carried in, which are whirled up again by the flow generated by the subway and the people waiting themselves, especially at rush hour. The filter systems mentioned in this application meet all the values required by the WHO.

3 shows the basic structure of a FT ceiling filter. The way it works is similar to that in 1 shown embodiment. However, in this embodiment, the air is sucked in from below by the ESP attached to the ceiling and cleaned again by the carbon and here optional HEPA filter and returned to the room by the 4 fans, which can be clearly seen in the figure guided. However, the shape and placement of the various embodiments dictate some additional considerations. An inspection flap is installed in the housing to clean the filter. This flap will be opened downwards with hydraulic dampers (45 degrees) in order to then clean the filter with the flap brush without much effort. The front of the housing should also be openable, since the HEPA filter also gets dirty and needs to be replaced. The replacement cycle of the HEPA filter is many times longer than with conventional systems, since the ESP absorbs most of the fine dust particles and aerosols. This results in a longer life cycle of the HEPA, which in turn means cost savings.

The distance between the ESP module and the activated carbon filter is intended as a dwelling chamber for the previously cleaned air. In this dwelling chamber, the air is cleaned of bacteria, viruses and germs by the ozone previously produced by the ESP and then sucked through the activated carbon filter. The activated carbon filter absorbs all harmful gases and odors. Following this process, the air is still sucked through the HEPA filter Redundancy any remaining fine dust particles and viruses etc. to be eliminated. The air is then blown vertically out of the filter and then spreads out in the room. I can't vacuum at the moment if we can solve the problem of air distribution in the room. To demonstrate this solution, the design of the case will have a very big impact. In principle, the air can only be discharged upwards, which does not benefit a targeted distribution of the cleaned air in the interior.

However, the minimum distance of 10cm to the ceiling should not be undercut. The change of the HEPA is indicated by a control lamp, which signals "filter change" if the pressure loss is too great (due to the contamination in the HEPA).

4 shows a lamellar comb for cleaning the lamellae in the electrostatic precipitator system. Such a complex system can only be kept at the level of performance with care and good care. The lamellar comb shown here is used to clean the individual lamellae of the electrostatic precipitator.

In industrial systems, the collector and grounding plates are cleaned by “tapping” them off or by wet cleaning (water and compressed air). The "lamellar comb" shown here was developed to avoid this cumbersome cleaning process. The lamellar comb is inserted into the space between the grounding and collector plates and the plates are cleaned of the accumulated dust by manual "saw" (back and forth movement) and lifting movements. The brush is ⅓ of the ESP width (due to handiness) and must therefore be used at least 3 times to clean the entire filter. The dust can then be vacuumed up with a standard vacuum cleaner. The advantage of the ESP filter with its cleaning brush is that it does not require high maintenance and accessory expenses. It is also often reusable.

• Durchmesser einer Bürste: 6mm
• Gesamtlänge: 400mm
• Besatzlänge: 100mm
• Besatz: Nylon
• Drehdraht: 1.2mm

The lamellar comb consists of individual cylindrical brushes that are offset to one another and attached to a plate. Staggered arrangement due to the small gap between the individual plates of the ESP, as otherwise the bores for the cylinder brushes could not be drilled. Cylinder brushes are similar to/are brushes used to clean bottles. The measurements are:

• Diameter of a brush: 6mm
• Total length: 400mm
• Trim length: 100mm
• Trim: nylon
• Twist Wire: 1.2mm

5 shows the grounding assembly that removes residual current from the electrostatic precipitator module. The electrostatic precipitator module 10 works with high voltage (6-10KV), after the device (cabinet) has been disconnected from the mains, the electrostatic precipitator module is still charged with residual current. You can of course wait a while before the electrostatic precipitator module is discharged, as this will automatically discharge itself over time. For faster discharge, the electrostatic precipitator module will be discharged through a ground wire for safety reasons.

• - Sobald die Rückwand vom Schrank abmontiert wird, wird die Erdungsstange durch die Feder (gespannt) in die Ausgangslage gebracht und das Elektrofiltermodul wird geerdet
• - Nachdem die Rückwand wieder montiert wird, wird die Feder zusammen gedrückt und die Erdungsbleche vom Elektrofiltermodul weggeführt

The mode of action is shown here cursorily:

• - As soon as the rear panel is removed from the cabinet, the earthing rod is brought into the initial position by the spring (tensioned) and the electrostatic precipitator module is earthed
• - After the rear panel is reassembled, the spring is compressed and the grounding plates are moved away from the electrostatic precipitator module

Claims (8)

Filter system (1), which has at least four modules for air filtration, this system • has at least one pre-filtering module, which is used to remove dust and dirt particles, • has at least a UV-C radiation module (11), which kills viruses, bacteria and germs, • has at least one electrostatic precipitator system (10) (as a module), which is used to separate fine dust and aerosols and • has at least one activated carbon filter module, which filters out odors and gaseous pollutants. Filter system (1) after claim 1 , characterized in that the modules are set up in such a way that they can be placed one on top of the other in any desired order. Filter system (1) according to one of the preceding claims, characterized in that the air flow flows through the filter system (1) from near the ground in the following order: • Inlet and at least one pre-filter module, • At least one electrostatic filter system (10), • At least one UV-C Radiation module (11) and • At least one activated carbon filter module. Filter system according to one of the first two claims, characterized in that the air flow passes through the filter system in top-down mode flows through in the following order: • inlet and at least one pre-filter module, • at least one electrostatic precipitator system (10), • at least one UV-C radiation module (11) and • at least one activated carbon filter module. Filter system (1) according to one of the preceding claims, characterized in that the modular filter system is arranged in a frame system, exchangeable cover plates being attached to the frame system. Filter system (1) according to one of the preceding claims, characterized in that the space around the filter system (1) is delimited by air curtains. Filter system (1) according to one of the preceding claims, characterized in that it can be operated via a radio module. Filter system (1) according to one of the preceding claims, characterized in that it has a roller device and is therefore mobile.

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