Purification device for purifying air

Abstract

The invention relates to a cleaning device for cleaning air, comprising a filter medium (2) and an electrode assembly (4) of an ionizer device (3) upstream of the filter medium (2), which electrode assembly has an electrode (5) and a counter electrode (6), between which an electrical voltage is applied for corona discharge during operation. An improved and long-lasting cleaning effect is achieved in that the counter electrode (6) is electrically connected to the filter medium (2) in a reactivation mode. The invention also relates to an air-conditioning system (100) and a vehicle (200) having such a cleaning device (1).

Description

Technical Field

[0001] The present invention relates to a purification device for purifying air, in particular to a purification device for a vehicle, and further relates to an air conditioning installation and a vehicle having the purification device. Background Art

[0002] In many applications, it is desirable to purify the air. For this purpose, purification devices with filter media are usually used. To purify the air, the air flows through the filter media, wherein the filter media filters particles such as dust from the air and thus purifies the air.

[0003] It is known to equip purification devices with ionizer means.

[0004] Such a purification device is known, for example, from EP 3 488 933 A1. This purification device comprises an ionizer device upstream of a filter medium, the ionizer device comprising an electrode and a counter-electrode. The filter medium is arranged between two further electrodes arranged downstream of the ionizer device. During operation, voltages of opposite polarity are applied between the ionizer device electrode, the counter-electrode, and the electrode with the filter medium arranged therebetween. Summary of the Invention

[0005] The object of the present invention is to specify an improved or at least different embodiment of a purification device of the type mentioned at the outset and of an air-conditioning system and a vehicle having such a purification device, which is distinguished in particular by a long-lasting purification effect on the air.

[0006] According to the invention, this object is achieved by the subject matter of the independent claim. Advantageous embodiments are the subject matter of the dependent claims.

[0007] The basic idea of ​​the present invention is therefore to generate an electrostatic charge in the filter medium in a purification device having a filter medium and an ionizer device arranged upstream of the filter medium by electrically connecting the filter medium to a counter-electrode of the ionizer device. According to the present invention, it is recognized that the electrical connection of the filter medium to the counter-electrode leads to an electrostatic accumulation of charge carriers in the filter medium (hereinafter also referred to as filter charge carriers). These filter charge carriers interact synergistically with the charge carriers in the air (hereinafter also referred to as air charge carriers) generated by the ionizer device (including, in particular, ionized particles in the air) to achieve improved and lasting particle filtration from the air. The electrostatic accumulation in the filter medium does not need to be permanent, so that the electrical connection between the filter medium and the counter-electrode is only used during the electrostatic accumulation of the filter charge carriers (hereinafter also referred to as reactivation). This results in a lasting improvement in the purification effect while simplifying the operation of the purification device.

[0008] According to the present invention, a purification device includes a filter medium for filtering particles from air. The air flow path is directed through the filter medium. The purification device also includes an ionizer device. The ionizer device includes an electrode assembly through which the flow path is directed upstream of the filter medium. The electrode assembly includes an electrode equipped with at least one emitter and a counter electrode. During operation, a voltage is applied between the electrode and the counter electrode to generate a corona discharge in the air. The filter medium includes at least one conductive segment and at least one dielectric segment. Each of the at least one conductive segments is hereinafter referred to as a conductive segment, and each of the at least one dielectric segments is hereinafter referred to as a static segment. Thus, the filter medium includes at least one conductive segment and at least one static segment. The at least one conductive segment and the at least one static segment follow one another along the flow path. In a first operating mode, at least one of the at least one conductive segment (preferably each conductive segment) is electrically connected to the counter electrode, while in a second operating mode, this electrical connection is disconnected. The second operating mode is hereinafter referred to as the normal operating mode, while the first operating mode is referred to as the reactivation mode. The purification device also includes a control device that is appropriately designed for operating the purification device. The control device is thus designed to operate the purification device sequentially in a normal operating mode and a reactivation mode. In the reactivation mode, at least one of the at least one conductive segment, in particular the respective conductive segment, is electrically connected to the counter electrode, whereas in the normal operating mode, the electrical connection is disconnected.

[0009] The filter medium is preferably electrostatically charged beforehand, in particular before the purification system is put into operation for the first time. In the reactivation mode, the charge that may have been reduced during operation of the purification system, in particular during normal operation, is at least partially restored. Thus, in the reactivation mode, the previously existing electrostatic charge is at least partially reactivated.

[0010] During operation of the ionizer device, the respective emitter is used to emit electrons. In this case, in the reactivation mode, the electrons can pass from the emitter through the air to the filter medium and thus cause reactivation.

[0011] Preferably, the respective emitter is configured as a spike or a needle.

[0012] In principle, the filter medium can be of any design as long as it cleans the air by means of absorbent particles (preferably also absorbs odors) and has at least one conducting section and at least one static section.

[0013] For example, at least one of the at least one static section can consist of fibers or comprise fibers.

[0014] For example, at least one of the at least one conducting section may be or comprise activated carbon.

[0015] Preferably, the respective static section and the respective conductive section are configured as layers in the filter medium. This means that in the filter medium, the respective conductive section is a conductive layer, while the respective static section is a dielectric layer. This improves the flow rate and the purification effect.

[0016] Purification equipment is used to purify the air and can be used for any purpose.

[0017] Purification devices can be used, for example, in air conditioning systems, in particular in so-called “HVAC systems”, where the English abbreviation “HVAC” stands for “Heating, Ventilating and Air Conditioning”.

[0018] The air conditioning system preferably has at least one heat exchanger, through which air flows during operation, so that during operation of the heat exchanger heat is transferred from the air to the heat exchanger, or vice versa.

[0019] The purification device is particularly used for vehicles. In the vehicle, the purification device is preferably used to purify the air to be delivered to the interior of the vehicle. Here, the purification device can be a component of such an air-conditioning system.

[0020] A voltage in the kilovolt range is applied between the electrode and the counter-electrode for generating a corona discharge, for example, between 5 kV and 11 kV, in particular 8 kV.

[0021] Preferably, the purification device has a voltage source, which is used to apply a voltage between the electrode and the counter electrode. Here, the electrode and the counter electrode are respectively electrically connected to one pole of the voltage source.

[0022] In a preferred embodiment, the counter electrode is electrically connected to at least one conductive segment via a voltage source. This not only improves operational safety, but also simplifies implementation. During operation of the ionizer device, the electrode is connected to a first pole of the voltage source, in particular to the negative pole, while the counter electrode is connected to a second pole of the voltage source, in particular to the counter pole and thus the counter potential. The control device is designed such that, in reactivation mode, it electrically connects at least one of the at least one conductive segment to the second pole of the voltage source, thereby electrically connecting the at least one conductive segment and the counter electrode via the voltage source. Furthermore, the control device is designed such that, in normal operation mode, it disconnects the electrical connection to the second pole.

[0023] In this sense, a "pole" is a pole that is formed due to a potential difference that is advantageously provided by a voltage source. Thus, a matching pole can also be a grounded pole.

[0024] A preferred embodiment is to generate a negative corona discharge during operation of the ionizer device. Preferably, this occurs both in normal operation and in reactivation mode. Therefore, the electrodes (particularly at least one emitter) have a negative polarity and form a matching potential with the counter electrode.

[0025] The order of the at least one conducting section and the at least one static section along the flow path may be arbitrary.

[0026] As a preferred embodiment, at least one of the at least one conducting sections is arranged downstream of one of the at least one quiescent sections. This means that along the flow path, at least one quiescent section is arranged between each of the at least one conducting section and the electrode assembly. This results in improved reactivation in the reactivation mode.

[0027] In a preferred variant, the electrical connection between the counter electrode and the filter medium is achieved by means of an electrical conductor. This means that the electrical conductor preferably electrically connects the counter electrode to at least one of the at least one conductive segments via the second pole of the voltage source, advantageously to the respective conductive segments. This electrical connection can be disconnected or established by means of a switch of the purification device. The control device opens the switch in normal operating mode and closes it in reactivation mode. The control device is designed accordingly. When the switch is open, the electrical connection between the counter electrode and the at least one conductive segment is interrupted, while when the switch is closed, the electrical connection is established. This allows for simple and reliable implementation of the operating modes.

[0028] The control device can be designed arbitrarily for selecting the respective operating mode and for switching between the normal operating mode and the reactivation mode.

[0029] The duration of the normal operating mode is preferably significantly longer than the duration of the reactivation mode. This prevents, in particular, excessive electrostatic charging of the filter medium and, therefore, in particular, the repulsion of airborne charge carriers from the filter medium. This means that the purification effect is improved in this way.

[0030] Advantageously, the duration of each reactivation mode is between 1 minute and 10 minutes. This means that the operating duration in each reactivation mode is between 1 minute and 10 minutes. For example, the operating duration of each reactivation mode is between 2 minutes and 5 minutes, in particular 5 minutes.

[0031] For example, the control device can be designed such that the operating duration in the normal operating mode is at least ten times the operating duration in the reactivation mode.

[0032] It is conceivable to switch between the normal operating mode and the reactivation mode at predetermined time intervals. Therefore, the control device is designed to switch between the normal operating mode and the reactivation mode at predetermined time intervals. For this purpose, the control device may include a timer. Preferably, the operating duration of the respective normal operating mode is longer than the operating duration of the respective reactivation mode.

[0033] Alternatively or additionally, it is conceivable to switch between normal operation mode and reactivation mode when the quality of the air downstream of the filter medium is insufficiently high. To this end, in a preferred embodiment, the purification device includes a sensor device arranged downstream of the filter medium for detecting a measured value representative of the air quality. The control device is connected to the sensor device and is designed to initiate a switch from normal operation mode to reactivation mode when the measured value detected by the sensor device falls below a predetermined limit value.

[0034] The measured value is in particular a measured value representing or including the dust content and / or fine dust content in the air. Therefore, the sensor device can have a dust sensor and / or a fine dust sensor.

[0035] Preferably, the at least one emitter and the filter medium are spaced apart from one another, wherein the distance between at least one of the at least one emitter and the filter medium along the flow path is between 0 mm and 30 mm, in particular 7 mm. Preferably, the distance between the static section, which is located toward the front end of the at least one emitter, and the at least one emitter along the flow path is between 0 mm and 30 mm, in particular 7 mm. This allows for efficient and rapid reactivation with sufficient operational safety in reactivation mode. Thus, an improved purification effect is achieved with sufficient operational safety.

[0036] The emitter can project in the direction of the mating electrode or in the direction of the filter medium.

[0037] The electrodes can have rods spaced apart from one another transversely to the flow path, from each of which rods at least one emitter projects, preferably toward the counter-electrode.

[0038] The distance between the rods is advantageously between 20 mm and 60 mm, for example 30 mm.

[0039] In particular, at least two emitters protrude from the respective rod toward the filter medium and / or toward the counter electrode, spaced apart from one another transversely to the flow direction and / or transversely to the spacing direction of the rods. The distance between the emitters of the rods is advantageously between 10 mm and 30 mm, for example 20 mm.

[0040] The electrodes, in particular the emitters, eg the respective rods, advantageously have a high electrical conductivity and are preferably made of stainless steel.

[0041] In principle, the counter electrode can be designed in any desired manner. The counter electrode preferably has a high electrical conductivity and is made of stainless steel, for example.

[0042] Advantageously, the counter electrode can be flowed through by air. Thus, the flow path is advantageously guided through the counter electrode. This leads to improved generation of air charge carriers.

[0043] In a preferred embodiment, the counter electrode comprises an electrically conductive grid, in particular, an electrically conductive grid through which the flow path is guided. This reduces the flow resistance in the purification system. This allows, in particular, for more efficient operation of the purification system and a more compact design.

[0044] The grid preferably has a mesh width of between 1 mm and 6 mm, for example 3 mm.

[0045] It should be understood that, in addition to the purification device, an air-conditioning facility and a vehicle having the purification device are also included in the scope of the present invention.

[0046] Further important features and advantages of the invention are apparent from the dependent claims, the drawings and from the associated description of the figures with reference to the drawings.

[0047] It will be understood that the features mentioned above and still to be explained below can be used not only in the respectively stated combination but also in other combinations or alone, without departing from the scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Preferred exemplary embodiments of the invention are shown in the drawings and are explained in more detail in the following description, wherein identical reference numerals refer to identical or similar or functionally identical components.

[0049] Schematically, they are:

[0050] Figure 1 A diagram showing a greatly simplified block diagram of a purification device in a vehicle air conditioning system;

[0051] Figure 2 A simplified cross-sectional view of a purification device is shown;

[0052] Figure 3 An isometric exploded view of a purification apparatus is shown, wherein electrical connections are shown in a block diagram format;

[0053] Figure 4 Detailed view showing the filter medium of the purification device. DETAILED DESCRIPTION

[0054] As exemplified in Figures 1 to 4 The purification device 1 shown in FIG is used to purify air. For this purpose, the flow path P of the air is guided through the purification device 1. As can be seen from Figure 1 It is known that the purification device 1 can be used in an air conditioning system 100 and / or a vehicle 200. Here, the vehicle 200 can include the air conditioning system 100. After flowing through the purification device 1, the air flows into the interior space 201 of the vehicle 200. Therefore, the interior space 201 is arranged downstream of the purification device 1. The air conditioning system 100 has at least one heat exchanger 101, which is used to transfer heat with the air. The flow path P is guided through the heat exchanger 101. Figure 1 In FIG, a single heat exchanger 101 of the air conditioning system 100 can be seen, which is arranged purely by way of example downstream of the purification device 1. Of course, the air conditioning system 100 can also have a plurality of heat exchangers 101. At least one of the at least one heat exchanger 101 is connected to the Figure 1 In the loop flow 102 indicated in FIG, during operation of the air conditioning system 100, a fluid (eg, a refrigerant or coolant) circulates through the loop flow separately from the air fluid.

[0055] Especially from Figure 2 and Figure 3As can be seen in the figure, the purification device 1 includes a filter medium 2 for filtering particles from the air. An air flow path P is guided through the filter medium 2. During operation, air flows through the filter medium 2, where it filters particles, such as dust and fine dust, from the air. Preferably, the filter medium 2 also filters odors from the air. The filter medium 2 is designed accordingly. In its new state, the filter medium 2 is preferably electrostatically charged, that is, it contains charge carriers (not shown), which are hereinafter referred to as filter charge carriers. The purification device 1 also includes an ionizer device 3, which is used to generate a corona discharge in the air and, in combination, to charge and ionize airborne molecules and particles. Thus, the ionizer device 3 generates charge carriers in the air, which are hereinafter referred to as air charge carriers. For the corona discharge, the ionizer device 3 includes an assembly 4 consisting of electrodes 5 and 6, which is hereinafter referred to as the electrode assembly 4. Therefore, the electrode assembly 4 includes electrodes 5 and 6 that are polarized differently during operation. For better differentiation, these electrodes will be referred to as the electrode 5 and the counter electrode 6. During operation, a voltage for generating a corona discharge, for example, a voltage of several kilovolts, is applied between the electrode 5 and the counter-electrode 6. A flow path P leads upstream of the filter medium 2 through the electrode assembly 4. The electrode 5 has emitters 7 that emit electrons during operation of the ionizer device 3. In the illustrated embodiment, the emitters 7 are each configured as a protruding tip 8. Each emitter 7 protrudes, for example, toward the filter medium 2 or toward the counter-electrode 6. In the illustrated embodiment, the electrode 5 and the counter-electrode 6 are each made, for example, of stainless steel. Figure 4 A detailed view of the filter medium 2 is shown. It can be seen that the filter medium 2 has at least one electrically conductive section 9 (hereinafter also referred to as conductive section 9 ) and at least one dielectric section 10 (hereinafter also referred to as static section 10 ), which follow one another along the flow path P. Figure 4 , purely by way of example and for the sake of simplicity, it is assumed that the filter medium 2 has a static section 10 and a conductive section 9. In the exemplary embodiment shown, the static section 10 and the conductive section 9 are each designed as a layer 11. In the exemplary embodiment shown, at least one conductive section 9 is respectively arranged downstream of one of the at least one static section 10. In the exemplary embodiment shown, this means that the static section 10 is arranged upstream of the conductive section 9.

[0056] In addition, from Figure 4 It can be seen that in the exemplary embodiment shown, the filter medium 2 is a pleated filter medium 2 in which the layer 11 is pleated. The static section 10 is, for example, a fiber 12, i.e., in the exemplary embodiment shown, the layer 11 is composed of fibers 12. The conductive section 9 is, for example, activated carbon 13, i.e., in the exemplary embodiment shown, the layer 11 is composed of activated carbon 13.

[0057] As will be described below, it is possible to use the cleaning device 1 to establish an electrical connection between the counter electrode 6 and the conducting section 9. Figure 3 . This is achieved by the control device 14 indicated in . In the first operating mode, the conductive section 9 is electrically connected to the counter electrode 6. In the second operating mode, the electrical connection between the conductive section 9 and the counter electrode 6 is disconnected. The second operating mode is hereinafter referred to as the normal operating mode, while the first operating mode is referred to as the reactivation mode. In the reactivation mode, charge carriers appear, in particular electrons emitted from at least one emitter 7, which are transferred to the filter medium 2. This causes the static charge of the filter medium 2, which has been reduced during the operation of the purification device 1, to be accumulated again. Subsequently, the purification device 1 operates in the normal operating mode again. Therefore, the purification device 1 can operate in normal operating mode and reactivation mode sequentially, in particular alternately. The operating duration of each reactivation mode is advantageously less than 10 minutes, for example, between 1 minute and 10 minutes. In addition, the operating duration of each normal operating mode is advantageously significantly longer than the operating duration of each reactivation mode. For example, the operating duration of the normal operating mode is at least ten times the operating duration of the reactivation mode.

[0058] In the embodiment shown, the electrical connection between the conducting section 9 and the counter electrode 6 is achieved by means of Figure 3 As shown in Figure 4 The electrical connection can be achieved by means of the electrical conductor 15 indicated in FIG. Figure 3 The switch 16 shown in FIG. Figure 3 , the switch 16 is arranged purely by way of example in the conductor 15. In the reactivation mode, the switch 16 is closed, so that the counter electrode 6 and the conducting section 9 are electrically connected to each other via the conductor 15. In the normal operating mode, the switch 16 is open, so that the electrical connection between the counter electrode 6 and the conducting section 9 is disconnected. Figure 3 Here the disconnected state of the switch 16 is shown, thus the normal operating mode. Figure 3 As indicated by a double arrow in FIG, the control device 14 is connected to the switch 16 and is designed to open the switch 16 in normal operation and to close the switch 16 in the reactivation mode.

[0059] from Figure 3It can be seen that in the embodiment shown, the purification device 1 has a voltage source 17, by means of which a voltage is generated between the electrode 5 and the counter-electrode 6. To provide the voltage, the voltage source 17 has a first pole 18 and a second pole 19. In the embodiment shown, the first pole 18 is the negative pole 20 of the voltage source 17. The second pole 19 is the counter-pole 21 and is therefore at a counter potential relative to the negative pole 20, i.e., in particular, also the ground pole 22. Therefore, during operation of the ionizer device 3, both in normal operating mode and in reactivation mode, a negative corona discharge occurs in the air.

[0060] In addition, from Figure 3 It can also be seen that in the embodiment shown, the counter electrode 6 is electrically connected to the conducting section 9 by means of a voltage source 17. For this purpose, the conductor 15 electrically connects the second pole 19 to the conducting section 9 and thus also to the counter electrode 6. Figure 3 As indicated in , the switch 16 can be arranged in the conductor 15 between the second pole 19 and the conducting section 9. In normal operating mode, the electrical connection between the conducting section 9 and the second pole 19 is disconnected, and thus the electrical connection between the conducting section 9 and the counter electrode 6 is also disconnected.

[0061] The switch between the normal operating mode and the reactivation mode can be performed at predetermined time intervals. The control device 14 is designed accordingly.

[0062] Alternatively or additionally, the purification device 1 may have a Figure 2 . The sensor device 23 is used to determine a measured value representative of the air quality. In the illustrated embodiment, the sensor device 23 includes a particle sensor 24. The measured value thus represents or includes the particle content in the air downstream of the filter medium 2. When the measured value falls below a predetermined limit value, in particular when the particle content exceeds a predetermined value, a switch is made from normal operating mode to reactivation mode. Advantageously, the reactivation mode remains in operation for the aforementioned duration and then switches back to normal operating mode. The control device 14 is designed accordingly. The control device 14 is connected to the sensor device 23.

[0063] exist Figure 3As can be seen from the diagram, in the illustrated embodiment, the electrode 5 has rods 25 spaced apart from one another transversely to the flow path, from which emitters 7 each protrude toward the counterelectrode 6. In the illustrated embodiment, purely by way of example, the electrode 5 has five such rods 25, each of which has six emitters 7. In the illustrated embodiment, purely by way of example, the rods 25 and emitters 7 are identical in design. The spacing between successive rods 25 can range from 20 mm to 60 mm, for example, 30 mm. The spacing between successive emitters 7 along a respective rod 25 can range from 10 mm to 30 mm, for example, 20 mm.

[0064] Especially from Figure 2 As can be seen from the figure, emitters 7 and filter medium 2 are spaced apart from one another. The distance between at least one of the at least one emitter 7 (preferably each emitter 7) and filter medium 2 (preferably static section 10) along flow path P is preferably between 0 mm and 30 mm, for example 7 mm.

[0065] Especially from Figure 3 It can be seen that in the exemplary embodiment shown, the counter electrode 6 is designed as a grid 26 , through which the flow path P is guided.

Claims

1. A purification device (1) for purifying air, in particular a purification device for a vehicle (200), the purification device having - a filter medium (2) for filtering particles from the air, the flow path (P) of the air being directed through the filter medium, - an ionizer device (3) having an electrode assembly (4), through which the flow path (P) leads upstream of the filter medium (2), - in, The electrode assembly (4) has an electrode (5) equipped with at least one emitter (7) and a counter electrode (6), between which a voltage is applied during operation for generating a corona discharge in the air. - wherein the filter medium (2) has at least one electrically conductive section (9) and at least one dielectrically static section (10) following one another along the flow path (P), - a control device (14) designed such that it causes the purification device (1) to operate in a normal operating mode and in a reactivation mode in sequence, wherein in the reactivation mode at least one of the at least one conducting section (9), in particular the respective conducting section (9), is electrically connected to the counter electrode (6), whereas in the normal operating mode the electrical connection is disconnected.

2. The purification device according to claim 1, It is characterized in that - the purification device (1) has a voltage source (17) for applying a voltage between the electrode (5) and the counter electrode (6), - during operation of the ionizer device (3), the electrode (5) is connected to a first pole (18), in particular to a negative pole (20), of the voltage source (17), and the counter electrode (6) is connected to a second pole (19), i.e. to a counter pole (21), of the voltage source (17), - the control device (14) is designed such that in the reactivation mode it electrically connects at least one of the at least one conducting section (9) to the second pole (19) of the voltage source (17), so that the at least one conducting section (9) is electrically connected to the counter electrode (6) by means of the voltage source (17), and in the normal operation mode it disconnects the electrical connection to the second pole (19).

3. The purification device according to claim 1 or 2, It is characterized in that The respective at least one conducting section (9) is arranged downstream of a static section of the at least one static section (10).

4. The purification device according to any one of claims 1 to 3, It is characterized in that The control device (14) is designed to ensure that the operating duration in the normal operating mode is at least ten times the operating duration in the reactivation mode.

5. The purification device according to any one of claims 1 to 4, It is characterized in that The control device (14) is designed to switch between the normal operation mode and the reactivation mode at predetermined time intervals.

6. The purification device according to any one of claims 1 to 5, It is characterized in that - the purification device (1) has a sensor device (23) arranged downstream of the filter medium (2) for determining a measured value representative of the quality of the air, The control device (14) is connected to the sensor device (23) and is designed to effect a change from the normal operating mode to the reactivation mode when a measured value determined by means of the sensor device (23) falls below a predetermined limit value.

7. The purification device according to any one of claims 1 to 6, It is characterized in that an electrical conductor (15) connecting the counter electrode (6) to at least one of the at least one conducting section (9), in particular via a second pole (19) according to claim 2, - the purification device (1) has a switch (16) for establishing and disconnecting the electrical connection between the counter electrode (6) and the filter medium (2) via the conductor (15), The control device (14) is designed such that it opens the switch (16) in a normal operating mode and closes the switch in a reactivation mode.

8. The purification device according to any one of claims 1 to 7, It is characterized in that The electrode (5) is negatively polarized in normal operation mode and in reactivation mode, while the counter electrode (6) forms a counter potential.

9. The purification device according to any one of claims 1 to 8, It is characterized in that The at least one emitter (7) and the filter medium (2) are spaced apart from one another, wherein the distance between at least one of the at least one emitter (7) and the filter medium (2) along the flow path (P) is between 0 mm and 30 mm, in particular 7 mm.

10. The purification device according to any one of claims 1 to 9, It is characterized in that The electrode (5) has rods (25) which are spaced apart from one another transversely to the flow path (P) and from which at least one emitter (7) protrudes in each case.

11. The purification device according to any one of claims 1 to 10, It is characterized in that The counter electrode (6) has an electrically conductive grid (26) or is an electrically conductive grid through which the flow path (P) is guided.

12. The purification device according to any one of claims 1 to 11, It is characterized in that The operating duration in reactivation mode is between 1 minute and 10 minutes.

13. The purification device according to any one of claims 1 to 12, It is characterized in that The respective static section (10) and the respective conducting section (9) are designed as a layer (11) in the filter medium (2).

14. An air conditioning installation (100), in particular an air conditioning installation for a vehicle (200), through which a flow path (P) of air is directed, the air conditioning installation having - at least one heat exchanger (101) for transferring heat to air, - A purification device (1) according to any one of the preceding claims, arranged in a flow path (P).

15. A vehicle (200) having a cleaning device (1) according to any one of claims 1 to 13, in particular having an air conditioning system (100) according to claim 14.

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