DE2258446A1 - AIR FILTER FOR SPACE TRAP OF CHARGED PARTICLES - Google Patents

Description

Dr. Horst Schüler Frankfurt, November 27th, 1972

Patent attorney Vo / es

Frankfurt / Main 1

Niddastraße 52 2258446 3368 ~ RD-5336

GENERAL ELECTRIC COMPANY

1 River Road Schenectady, N.Y ,, U.S.A.

Air filter to trap the charged

Particle

The invention relates to a household air filter and in particular to an air filter that can be used as an add-on to an indoor air conditioner to remove particulates by trapping charged particles from an air stream.

Household appliances, such as room air conditioners, are fitted with filters that provide some degree of air filtration. In many cases, however, such a filter is not sufficient. There are different types

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of air filters, and some of these can undoubtedly be used as an add-on to room air conditioners will. Such filters, however, generally only remove the larger particles, i.e. those with diameter sizes greater than 100 microns or / m.

Electrostatic filters, also known as DC-type electrostatic precipitators, are known and capable of separating particles less than 100 microns in size. However, the charged particles are brought into contact in direct current separators with electrode plates and build a layer there which must be periodically eliminated if the device is to continue to operate satisfactorily. the A layer of the particles on the electrodes is usually removed by washing the filter. This method of removing the particles is inconvenient, time consuming, easily damaged, and obviously undesirable.

A main object of the present invention is therefore to provide an air filter that is part in the Captures space rather than on the surface of an electrode.

An article with the title "Electrodyna.ical Behavior of Charged Aerosol Particles in Non-uniform" Alternating Fields and Its Applications in Dust Control * ¹ by Senichi Masuda and others is in the German magazine "Staub · Reinhaltung der Luft", Volume 30 ( 1970), No. 11, mainly directed to the description of parallel cylindrical electrodes or rods lying in one plane, which are connected to an alternating voltage source,

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to create a series of non-uniform alternating current fields that form what is known as an electrical curtain that drives charged particles back into a viscous medium. ¹ "The present invention is directed to a specific application of the concept suggested in the publication by Masuda, and in particular to a specific geometry of parallel electrical conductors that provide excellent filtration of the air flowing from a household appliance, such as a room air conditioner.

Another task is therefore to create an air filter to create that is suitable as an addition to a room air conditioner.

According to the present invention there is a household appliance in the form of an air filter that is suitable as an add-on to room air conditioners. The invention uses the space trapping of charged particles in the filtering process and comprises a channel with a first end, through which an air stream is fed. A multitude of electrical conductors distributed across the duct, are connected to a direct current high voltage source to create a corona discharge that carries the particles into the air flow charges as it flows past numerous parallel planar rows of electrical conductors are arranged downstream in the channel, the relative are arranged at an angle to the axis of the air flow in the duct. The last ladder are all parallel to each other and are connected to an alternating voltage source,

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to generate two-dimensional, multipolar alternating electrodynamic fields over the channel. The particular arrangement of the multipolar fields that are generated are determined by the particular orientation and electrical connections of the conductors. The by the multipolar Fields generated electrical forces trap the charged particles in the air flow, and the orientation the air flow relative to the angular position of the planar rows of conductors causes the particles to te of the channel are directed or directed, from which they can be removed. Collecting the particles is reinforced by coating the conductors with a material of high dielectric strength that allows operation at higher AC voltages, the can be high enough to generate corona discharge and charging the particles, thereby obviating the need for the separate conductors operated by high voltage direct current. The filter is particularly well suited for removing particles in the On the order of 0.01 to 100 microns in diameter, and larger particles can be removed by removing the The amplitude of the alternating voltage increases or the distance between the conductors that make up the multipolar is decreased Create fields.

The invention will now be described with further features and advantages on the basis of the following description and the accompanying drawings Drawings of various exemplary embodiments explained in more detail. There are identical parts in the different figures provided with the same reference number.

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Fig. 1 is a partially sectioned side view of a first embodiment of the air filter according to the invention.

FIG. 2 is a top view, partially in section, of the filter shown in FIG. 1.

Fig. 3 is a schematic diagram and illustrates the orientation and electrical connections of the parallel planar rows of electrical conductors, the, electrodynamic quadrupole alternating fields in generate the filter shown in Figures 1 and 2.

Fig. 4 is a schematic diagram and illustrates the orientation and electrical connections of the electrical conductors, the electrodynamic hexapole alternating fields produce.

Fig. 5 is a schematic diagram and illustrates the orientation and electrical connections of the electrical conductors for generating electrodynamic Hexapole alternating fields, as in Fig. 4, where additional conductors for three-phase operation are provided, which also for the particle charging function care for.

Fig. 6 is a schematic diagram and illustrates the orientation and electrical connections of the electrical conductors to produce a third embodiment the multipolar electrodynamic

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Alternating fields.

In Flg. 1 shows a side view of the filter according to the invention. A channel 10, which encloses the elements of the air filter according to the invention, has a first end 10a for the admission of an air flow and a second end End 10b for the exit of the air flow. However, the channel can have various shapes, with a square or rectangular cross-section being the simplest appears to be in favor of using straight electrical conductors to generate the multipolar alternating electrodynamic fields to be described below. Of course, the channel could have a circular or other curved or non-curved cross-section and the aforementioned conductors would be curved or be straight. A fan 11, typically motor driven, is near the first end 10a of the duct arranged to create the air flow to that end. The fan 11 can be arranged inside the duct 10, either directly in or outside the duct, in the latter case, the fan motor is generally included in a room air conditioner. In the latter case it is the first end 10a of the duct connected to the output end of the air conditioner so that the air after it has flowed through the air conditioner, passes through the duct 10 before exiting into the room. The one from that The air flow generated by the fan 11 may contain particles of various sizes which have not been filtered out in the filter of the room air conditioner. The air filter according to the invention is particularly well suited to particles in the

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Scrap size range from Ο, ΟΙ to 100 microns in diameter. However, it should be expressly pointed out that the filter according to the invention is in no way dependent is limited, particles in only this size range from * filter, which is explained in more detail below.

Downstream of the fan 11 and within the duct 10, a device is arranged to electrically charge the particles in the air flow. As an example, the electrical charging device may consist of a planar row of spaced parallel conductors 12 which extend over substantially the entire cross-sectional area in the channel 10 and are preferably oriented perpendicular to the axis of the air flow. The conductors 12 are preferably of the same size in the range from 0.05 to 1.25 mm (0.002 to 0.25 to 0.08 in diameter) and are preferably equally spaced in the range from 6 to 50 mm (0.25 to 2.0) Target) arranged. The conductors 12 may pass separately through a wall of the anal 10, as shown in FIG. 2, and their ends are connected to a DC voltage source having an output voltage on the order of 10 to 20 kilovolts. Alternatively, the ends of conductors 12 are connected to a common busbar within duct 10 adjacent a duct wall, and the busbar passes through the wall for connection to the DC power source. In this latter arrangement of conductors 12, the ends of the conductors could be captured in an electrically insulated frame portion 12a disposed along the inner surfaces of the channel 10, such as

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it is shown in FIG. The conductors 12 can be arranged horizontally, as shown in the side and top views shown in Figures 1 and 2, respectively, or they can be oriented vertically or at other angles as desired be. The channel 10 can be made of an electrically non-conductive material such as plastic, or alternatively made of a conductive material such as aluminum or another metal. In the latter case will be electrically insulates the electrical conductors 12 from the walls of the channel 10 in a suitable manner, such as is indicated in the plan view of FIG. The DC voltage applied to the conductors 12 is high enough to be to cause a corona discharge around each of the conductors, which electrically charges the particles in the air flow.

Downstream of the electrical charge generating device 12 and angled within the channel 10 adjacent its second end 10b are numerous parallel planar rows 13, 14, 15 of electrical conductors which form the main features of the present invention. Although only three planar rows 13, 14, 15 are shown in FIGS. 1, 2 and 3, any plurality of planar rows can of course be provided according to the invention. These planar rows of conductors are angled relative to the axis of air flow in the channel and extend substantially the entire cross-sectional area in channel 10. The conductors in each planar row are spaced parallel to one another and angular relative to the axis of air flow below arranged at the same angle as the planar rows. The angle of the planar rows relative to the axis of the aerial

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Flow is in the range between 20 ° and 85 ° and is preferably in the large end of the range to both reduce the length of the ladder as well as the channel 10 to a minimum. If the channel 10 is a square or rectangular cross-section, an equal number of conductors is provided in each of the planar rows 13, 14, 15, and these conductors are arranged parallel to the opposite walls of the channel. As if from above according to FIG. 2 can be seen, are thus the parallel Conductors 13a-e in the planar row 13 parallel to the side walls of the channel 10. Run in the same way the parallel conductors 14a-e and 15a-e also parallel to these side walls. Of course you could the orientations of the planar rows 13, 14, 15 are rotated 90 ° so that the conductors are parallel to the Upper and lower walls of the channel 10 run. The distance between adjacent conductors in each planar Row and the orientation of adjacent conductors in adjacent rows and their electrical connections are determined by the two-dimensional, multipolar alternating electrodynamic fields that are to be generated by the conductors. Thus are in the case of the exemplary embodiment according to FIGS. 2 and 3, of which FIG. 3 is a schematic representation of the embodiment shown in FIG shown three planar rows 13, 14, 15, the conductors 13a-e, 14a-e, 15a-e for generating two-dimensional electrodynamic quadrupole alternating current fields above the channel 10, with the conductors in each planar Row are equally spaced and aligned with corresponding conductors in adjacent rows. The distance between adjacent planar rows is equal to the

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stood between adjacent conductors in each row, making the conductors the corners of equally sized squares form. '

Each planar row 13, 14, 15 of the conductors contains at least one two parallel conductors connected to opposite sides of an AC voltage source 20. In the general case where each planar row contains more than two conductors, the alternating (every other) Conductors connected to the same side of the AC voltage source 20, so that the adjacent conductors with voltages opposite polarity. The conductors in adjacent planar rows are in an opposite one Connected sense of polarity so that a first pair of diametrically opposed conductors in each group of four conductors that form the corners of a square on which there is a voltage polarity and the second pair has the opposite polarity at any point in time. In the exemplary embodiment according to FIG. 3, the aligned Ladder 13a, 15a and 13b, 15b and 13e, 15e in

the alternating planar rows 13, 15 are connected in the same way to the AC voltage source 20, whereas the conductors in row 14, which are also aligned with the conductors mentioned above, with an opposite sense of polarity connected to the electrodynamic quadrupole alternating current fields in each group of four related ladders.

The conductors in the planar rows preferably each have an equal diameter, that in one area

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can be up to 9 mm (3/8 inch), and the center-to-center spacing between adjacent conductors in a planar Row (and adjacent aligned conductors in adjacent planar rows) is in a range up to about 2.5 cm (1 inch). In general, the spacing between the conductors is preferably significantly greater than that Conductor diameter to provide a relatively open space between conductors to allow resistance to the Air flow is reduced to a minimum. As in the case of conductors 12, the conductors are in the planar rows borne by the walls of the channel 10 and electrically insulated from these, if such a channel consists of a electrically conductive material is made. Again, as in the case of the conductors 12, the conductors in the planar Rows separately pass through one wall of the channel 10, and their ends are common to two Conductors connected, which are connected to the AC voltage source 20, or the conductor ends can be in one electrically insulated frame part held, which is arranged along the inner surface of the channel 10, and be connected to common busbars passing through one or two opposing walls, to be connected to the AC voltage source.

The electrodynamic quadrupole alternating fields generated by the conductors in the planar rows 13, 14, 15, induce electrical forces that trap particles in the air flow passing through them. That means, that particles if insufficient air flow velocity is present, would remain distributed in the quadrupole fields against the force of gravity. The size

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dor trapped particles for a given parameter-EM /, is not limited to a narrow range, but can not cover less than five orders of magnitude of the diameter size. Thus if the ladder has a diameter of 3 mm (1/8 inch) and a center-to-center distance of 15 mm (5/8 inch) and the AC voltage have an effective value of 15 kilovolts at a frequency of 60 Hertz owns, the quadrupole fields are able to generate particles in the size range of 0.01-100 microns or yum diameter.

The electrical forces generated by the multipole electrodynamic alternators can be increased and the interception of particles can be increased by increasing the amplitude of the alternating voltage applied to the conductors. There is, however, a limit to which the voltage can be increased for a given spacing of bare conductors before flashover occurs between adjacent veins. It has been found that operation at higher voltages without flashover is achieved in that the conductors are coated with a material having a high electrical strength, such as a plastic or silicone. The coating thickness on the order of a millimeter or less allows a voltage increase of the order of 50 % or to the point where continuous corona discharge occurs around the conductors. The cover 24 is shown in greater detail in Figures 3-5. Operation at the increased voltage increases the efficiency of collecting particles in a given particle size range and also prevents larger particles from becoming larger. Furthermore, an operation at a gcntincu U

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AC voltage to generate corona discharge that uncharged particles are charged in the air flow and therefore avoids the need for the conductors 12 and their associated DC voltage supply. To this end, the alternating voltage applied to the conductors is made adjustable by any suitable device. In FIG. 1 it is represented by a variable transformer 21 which is connected to the AC voltage source 20. There was a _v uch found that a change in the distance between adjacent conductors varying the size of the particles that can be captured, and in particular an enlargement of the spacing results for trapping smaller particles.

The combination of the electrical forces created by the multipolar fields trapping the particles and the orientation of the air flow (sufficient flow performance) relative to the angular position of the conductors causes the particles to be directed to the side of the channel where the conductors pass through exit channel 10 on the downstream side of the exit. For this purpose, a device is provided in the wall of the channel 10 in which the downstream end of the ladder is held in order to collect particles conducted there. This collecting device can be a chamber 22, alü an example, which is formed in the bottom wall of the channel 10 and has a pivotably mounted bottom wall 22a to which a handle 23 is attached. This is operated as desired to empty the Karmer -12 borrowed from the collected LO. The side walls of the chamber 2il zweckmjißiger've la "don output can be used for the conductor L'ki - u, L-la - e, 15a - υ form, as illustrated in Figure 1 L;. t. No other suitable device for collecting

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the particle would be the use of an open ended chamber 22 covered with a suitable pouch or some other collection device into which the particles are directed.

4 shows a second orientation of the conductors for generating electrodynamic hexapole alternating fields. In in this embodiment whether they are coated or not coated conductors in alternating planar rows have an identical orientation so that they are aligned or cursing. The conductors in the odd planar rows (13, 15, 17) include at least one pair of closely spaced ones Conductors (13a, b .... and 17a, b), whereas the even-numbered rows (14, 16, 18) are at least a pair that are widely spaced Conductors (14a, b .... 18a, b) included to form the corners of the hexagons. Alternating ladder in each The row and the luminous conductors in the different parallel rows are connected to the same side of the AC voltage source 20 as shown in FIG. Thus the conductors are 13a, c and 14b, d and 15a, c and 16b, d and 17a, c and L8b, d with the left side of the power source 20 connected, as shown in Fig. 4, the momentary on a voltage of positive polarity should lie, whereas the other conductors 13b ... 18c in this Monent are fed with a voltage of negative polarity will. There are obviously three planar rows of Ladders required to make the six corners of each a hexagon to complete. Hexagons made by the three different ones Conductor pairs are formed, each have the same side lengths and the same angle because of the Orientation of this ladder. Figure 4 illustrates each planar heater such that it contains two pairs of conductors. Of course, however, each row can be a larger one

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Number of such pairs contain what of the cross-sectional dimension of the channel depends. As in the case of the exemplary embodiment 3, the use of the coating 24 on the conductors permits higher operation Voltage, which increases the efficiency of particle entry, and at a sufficiently high voltage for generating corona discharge, this avoids the requirement for the additional charging device for the particles including the conductors 12 and the DC voltage source.

Fig. 5 shows a second embodiment of the orientation of the conductors for generating electrodynamic hexapole alternating fields and more particularly, an orientation that is adapted for three-phase AC operation iüt. The conductors 13a-d, 14a-d, 18a-d are each preferred covered with the material of high dielectric strength as described in connection with FIG became. Alternate conductors in each row are connected to the same AC voltage phase, similar to Figure 4. However, additional bare conductors are added in the center of each hexagon formed by the coated conductors described above and these are bare Conductors are connected to the third alternating voltage phase. Thus, as shown in Fig. 5, is the bare conductor 13e arranged in the planar row 13 parallel to the conductors 13a - d (and likewise to all other conductors), placed in the middle between coated conductors 13b and 13c and with the third phase (3) the three-phase Alternating voltage source 20 connected. In a similar way AVeise are the bare conductors 14e and 141 in the planar one Row 14 arranged parallel to the other ladders,

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arranged in the middle between coated conductors 14a, 14b or 14c, 14d and connected to the AC voltage line connected to the third phase. The embodiment according to FIG. 5 is at a sufficiently high alternating voltage operated to around the bare conductors 13e, 14e, 14f .... 18e, 18f to generate a corona discharge which charges the particles in the air flow and the requirement for Avoids conductor 12 and its associated direct current high voltage source. Thus, Fig. 5 represents a second simplified one Illustrates an embodiment in which the upstream particle charger 12 is avoided.

A third embodiment of the multipolar electrodynamic Alternating fields for use in the invention Filters are suitable is shown in FIG. There are the overdrawn or not overdone Ladder oriented like the ladder in Fig. 4, but the distances between each successive pair of planar rows of conductors are markedly larger than the spacings in FIG. 4. In particular, the exemplary embodiment includes according to FIG. 6, an orientation and a spacing of the conductors in which the multipolar electrodynamic alternating fields can only be generated by two of the three planar rows that make up each multipolar field in the embodiment according to FIG. 4 form. Thus, a first planar row 13 includes widely spaced conductors 13a and 13b and one second planar row 14 arranged parallel to and close to row 13, closely spaced conductors 14a and 14a 14b, similar to the conductors in the exemplary embodiment according to FIG. 4. In contrast to FIG. 4, however, the next one Group of two parallel planar rows 15, 16 of the conductors arranged at a great distance from the first group, and in the second group, conductors 15a and 15b are aligned with the

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Conductors 13a and 13b, respectively, whereas conductors 16a and 16b are aligned with conductors 14a and 14b, respectively. The distance between the planar rows 14 and 15 is at least three times the distance between the adjacent conductors 13a and 14a. Even if the different aligning ones Conductors, such as conductors 13a, 15a, 17a, as connected to opposite sides of the AC power source are shown, this is not a limitation as the wide spacing between adjacent pairs of planar Rows of conductors each interaction of the electric fields is reduced to a negligible value.

Fig. 6 makes it clear that the electrical conductors can be arranged in many patterns to make multipolar electrodynamic Generate alternating fields of any desired order. Thus, by correctly orienting the conductors, octopolar and electrodynamic conductors can be achieved in a simple manner Higher order alternating fields are obtained.

The multipolar electrodynamic alternating fields generated by the conductors in each of the proposed embodiments, two-dimensionally, and the AC voltage is applied to this conductor, is for most applications in the range of 0.5 50 kilovolts, wherein an operating voltage of around 10 kilovolts is typical for many applications.

From the foregoing description it can be seen that the present invention is an improved household air filter creates, which is particularly well suited as an add-on to a room air conditioner for removing particles in the Size range that is generally not eliminated by the passive type filters that are included in the climate pre-

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direction can be used. It should be noted that the air conditioner, as it is referred to here, is not limited to the cooling device attached to the window, but it should be the pure fan device and likewise conventional household heating and cooling systems, in particular Hot air systems. Finally, the invention can also be used as an add-on to devices such as stoves, for disposal of scents, and to electric space heaters, for more examples of usability too to name. The air filter according to the invention works on the Principle that particles in an air flow are trapped in multipolar electrodynamic alternating fields, produced by planar rows of conductors coated with a material of high dielectric strength, which are connected to an AC voltage source. The trapped particles are directed to the side of the channel, which contains the elements of the air filter. This is due to the angular position of the planar rows relative to the axis of air flow. Although four specific embodiments of the invention have been described, thus, of course, multipolar alternating electrodynamic fields can also be arranged differently than those shown can be used to obtain the particle trapping effect.

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Claims (24)

~ Patent claims l.jAir filter for trapping charged particles, ^ ■ ^^ characterized by a channel (10) with a first end (10a) for the entry of an air flow and a second end (10b) for the exit of the air flow, a device (11) near the first end (10a) of the channel (10) for generating the air flow, which can contain particles in particular in the size range from 0.01 to 100 µm in diameter, a device (12) downstream of the device (11) for generating of the air flow and arranged in the channel (10) for electrically charging the particles in the air flow and parallel planar means (13-18) supported by the channel (10) downstream of the device (11) and relative to the axis of the Air flow are arranged at an angle to generate two-dimensional multipolar alternating electrodynamic fields over the channel (1O) _{9 in} such a way that the charged particles can be captured by the electrical forces generated by the multipolar fields and by virtue of the orientation of the air flow relative to the angular position of the parallel planar means (13-18), the trapped particles are directable to one side of the channel (10). 2. Air filter according to claim 1, characterized in that that further means (22) are provided which are connected to that side of the channel (10) are connected to which the particles are directed, for removing the particles from the channel {10), so that the particles emerging from the second end (10b) of the channel (10) Air flow a much smaller amount - 20 - 309823/0967 2258U6 of particles contains compared to that in the first Air flow entering the end (10a). 3. Air filter according to claim 2, characterized in that the parallel planar Means consist of numerous parallel planar rows (13-18) of electrical conductors (13a-l8f) with a AC voltage source (20) are connected. 4. Air filter according to claim 3> characterized in that that the electrical conductors (13a-18f) are essentially parallel to each other and in the at the same angle relative to the axis of the air flow as the parallel planar rows > (13-18). 5. Air filter according to claim 4, characterized in that that alternating electrical conductors in each planar row are connected to the same side of the AC voltage source (20), so that multipolar electrodynamic alternating fields can be generated whose special arrangement is due to the special " whose orientation of the ladder is determined. 6. Air filter according to claim * J, characterized in that that the adjacent electrical conductors in each planar row with opposite one another Sides of the AC voltage source (20) are connected, so that multipolar electrodynamic alternating fields whose exact arrangement is determined by the exact orientation of the ladder. 7. Air filter according to claim 6, characterized in that - 21 - 309823/0957 2258U6 indicates that the conductors (13a-e; e; 15a-e) in each planar row (13jl4} 15) are the same spaced and aligned with corresponding conductors in adjacent planar rows and the spacing z-i between adjacent planar rows equals the distance between the conductors in each planar row is so that the multipolar alternating electrodynamic fields are quadrupole-like (Fig. 3). 8. Air filter according to claim 6, characterized g ekennze'ichnet that the conductors are aligned in alternating planar rows (13-18) and the Conductors in a first of the alternating rows (13) at least one pair of closely spaced conductors (13ajl3b) have and the second of the alternating rows (14) at least one pair of widely spaced conductors (l ^ ajl ^ b) so that the multipolar electrodynamic alternating fields are hexapole-like (Pig. * 0. 9. Air filter according to claim 6, characterized in that that the electrical conductors with a coating (24) made of a material of high dielectric Strength are coated so that a higher alternating voltage can be applied to the electrical conductor 1st and an increased efficiency in trapping the particles can be achieved. 10. An air filter according to claim 9 _t characterized in that the electrical conductor ο ine such high AC voltage can be applied 1st that Coron lent charge occurs and the particles electrically at La Ib * r.ind, no that the device (12) for electric Charging the Tu borrowed with the parallel pla- BATH ORIGINAL ο <a - 22 rows (13-18) can be integrated 1st 11. Air filter according to claim ¹ J, characterized in that the electrical conductors in the area transverse to the channel (10) are straight. 12. Air filter according to claim 11, characterized in that that the distance between adjacent electrical conductors is in the range up to 2.5 cm. 13. Air filter according to claim 11, characterized in that the electrical conductor each have the same diameter. with air filter according to claim 13 | characterized in that the diameter of the electrical conductors is in the range up to 9 mm. 15. Air filter according to claim 4, characterized in that that the alternating voltage applied to the electrical conductors is in the range of 0.5 to 50 kV. 16. Air filter according to claim 15, characterized in that that the alternating voltage applied to the electrical conductors is about 10 kV. 17. Air filter according to claim 5, characterized in that that the AC voltage source (20) eLne is an adjustable voltage source and with an enlargement of the to the electrical conductor applied voltage, larger particles can be captured and - 23 - 309823/0957 - 23 can be directed to the side of the channel. 18. Air filter according to claim 2, "characterized in that ' that the particle removing device (22) is a chamber which is in that Side of the channel (10) is formed on the Particles are directed. 19. Air filter according to claim ¹ J, characterized in that the numerous electrical conductors are arranged in at least two parallel planar rows, each containing at least two electrical conductors. 20. Air filter according to claim 19, characterized in that that the planar rows of electrical conductors are relative to the axis of air flow are arranged at an angle and the angle formed is in the range of 20 ° to 85 °. 21. Air filter according to claim 1, characterized in that that the particle electrically charging device (12) is a second group numerous electrical conductors, which are located upstream of the parallel planar rows (13-I8) Arranged over the channel (10) and with a direct current high voltage source are connected, so that a Korana discharge around these electrical conductors can be generated by the particles in their flow charges via the second electrical conductor. 22. Air filter according to claim ß, characterized g e, that the electrical lines 309823/09 £ 7 -2H- ter (13a-d-l8a-d) with a cover (2 * 1) made of one High dielectric strength material are coated and the planar rows (13-18) / coated electrical Conductors further comprise a bare electrical conductor that runs parallel in the middle between each pair of the widely spaced conductors is arranged so that the coated and bare electrical Head a sufficiently high three-phase AC voltage can be applied so that around the bare conductor a Korana discharge is created and the particles are electrically chargeable, which makes the particles electrically charging device (12) can be integrated into the parallel planar rows (13-18). 23. Air filter according to one or more of claims 1-22, characterized in that the air filter is designed as an addition to a room air conditioner or a similar device. 24. Air filter according to claim 23, characterized in that that the access end (10a) of the channel (10) with the output of a room air conditioner or a similar device. 3 0 9 8 2 3/0957