Filtering device for filtering fluid and filtering system with filtering device

Abstract

The invention relates to a filtering device for filtering fluid and a filtering system with the filtering device. The invention relates to a filter device (1) for filtering a fluid, in particular air, having a filter element (3) for filtering particles from the fluid, which filter element is arranged in the flow path of the fluid. In order to achieve an improved filtering effect over an extended service life, the filtering device (1) has a cover (9) for mounting and / or replacing the filter element (3), an electrical conductor (13) being applied to the cover (9), which electrical conductor electrically contacts the filter element (3) in the closed state (11). The invention also relates to a filter system (100) having such a filter device (1) and an ionization device (101). The invention also relates to a motor vehicle (200) having such a filter device (1).

Description

Field of the Invention

[0001] The present invention relates to a filtration device for filtering a fluid, which has a filter element. The present invention also relates to a filtration system having such a filtration device and an ionization device. In addition, the present invention also relates to a motor vehicle having such a filtration device. Background Art

[0002] Filter elements are generally used for filtering fluids and are a component of a filtration device. Such filter elements typically include a filter medium that intercepts particles when traversed by the fluid to be filtered and thus filters the fluid.

[0003] Such a filtration device for filtering air is known, for example, from EP 3 488 933 A1. Summary of the Invention

[0004] The object of the present invention is to provide improved or at least different embodiments for a filtration device of the above type, a filtration system having such a filtration device, and a motor vehicle, which are characterized in particular by an improved filtration effect and a simplified implementation.

[0005] This object is solved according to the invention by the subject matter of the independent claims. Preferred embodiments are the subject matter of the dependent claims.

[0006] Thus, the present invention is based on the basic idea that the filter element of the filtration device is electrically contacted, in particular for electrostatic charging, wherein the electrical contact is mechanically coupled to a cover for mounting and / or replacing the filter element, so that electrical contact is automatically established when the cover is installed and fastened, and thus the electrical contact can be separated from the filter element as much as possible without damaging the filter element when the cover is loosened and / or removed and when the cover is placed and / or inserted. The electrical contact can be used for electrostatic charging of the filter element, so that the fluid filtered by the filter element, in particular air, is filtered improvedly with an extended operating duration. The contact via the cover also results in a simplified implementation while ensuring reliable operation. Overall, a simplified implementation is achieved with an improved filtration effect over an extended service life.

[0007] According to the concept of the present invention, the filtration device has a section through which the fluid to be filtered can flow through, and this section is hereinafter also referred to as the channel section. Accordingly, the flow path of the fluid is guided through the channel section. The filter element is arranged in the channel section and in the flow path and is used for filtering the fluid. The filter element has a filter medium for filtering particles from the fluid, and the flow path is guided through this filter medium. An opening for mounting and / or replacing the filter element is constructed in the channel section, and this opening is hereinafter also referred to as the mounting opening. Here, the filter element is plugged into the channel section through the mounting opening in a certain direction. This direction is hereinafter also referred to as the plugging direction. A cover is used to close the mounting opening. The closing device of the filtration device can be adjusted between two states in order to fix the cover at the channel section and release this fixation so that the cover can be removed from the mounting opening. These states are hereinafter also referred to as the closed state and the mounting state. In the closed state, the closing device fixes the cover at the channel section so that the cover closes the mounting opening. In the mounting state, the closing device releases the cover from the channel section so that the cover can be separated from the mounting opening. The cover has an inner side facing the filter element in the closed state. An electrical conductor is arranged on the inner side of the cover. The electrical conductor is mechanically coupled to the closing device such that the conductor touches the filter element and thus makes electrical contact therewith in the closed state, that is, the conductor is farther away from the filter element in the mounting state than in the closed state so that the conductor can move relative to the filter element in the plugging direction without damaging the filter medium.

[0008] Advantageously, the filter element is used for electrostatic charging of the filter element by electrical contact of the conductor. In particular, it is used for electrostatic charging of the filter medium by electrical contact of the conductor. The filter medium is designed accordingly. The filter medium can, for example, at least partly consist of an electrostatically chargeable electrically insulating material.

[0009] Advantageously, the filter medium has a pleated filter material through which the flow path passes. The filter medium can in particular be such a pleated filter material. The pleats of the filter material follow one another transversely or obliquely, preferably transversely to the plugging direction. Accordingly, the pleat gaps of the filter material also follow one another transversely or obliquely, preferably transversely to the plugging direction. Here, when the cover is placed in the mounting direction, the conductor is preferably spaced apart from the filter element along the flow path and moves in the direction of the filter element as it is adjusted into the closed state so that the conductor touches the filter element. Thus, the cover can be conveniently brought into the position of closing the mounting opening and the position of releasing the mounting opening, especially by movement in the plugging direction, without damaging the filter element or at least reducing the damage to the filter element. Similarly, in this way a reliable electrical contact of the filter element in the closed state is achieved.

[0010] In principle, any fluid can be filtered using the filtration device, especially using the filter element.

[0011] Advantageously, the filtering device is used for filtering gases (hereinafter also generally referred to as air). In particular, the filter medium is designed accordingly.

[0012] Preferably, the filter element has a conductive layer, wherein the conductor touches the conductive layer in the closed state and thus makes electrical contact therewith. Thus, the conductor touches the layer in the closed state, and the conductor is farther from the layer in the installed state than in the closed state, so that the conductor can also move relative to the filter element in the plugging direction without damaging the layer. Thus, reliable electrical contact of the filter element occurs. In addition, the electrical contact of the conductive layer of the filter medium results in a favorable interaction between the filter medium and the fluid to be filtered, especially the particles in the air, so that the particles are filtered with an improved filtering effect. Preferably, the layer is applied to the filter medium here.

[0013] In principle, the conductive layer can be of any type.

[0014] Preferably as a variant, the conductive layer has activated carbon, and the conductive layer is especially an activated carbon layer. Activated carbon itself causes filtration of the fluid, especially air. Thus, this further improves the filtering effect.

[0015] An advantageous embodiment is that the conductive layer, especially the activated carbon layer, is applied to the filter medium. In this way, a reduction in the pressure drop in the fluid can occur, so that the filtering device operates more efficiently and is constructed more compactly. In addition, this also results in simple operation.

[0016] Advantageously, the conductive layer, especially the activated carbon layer, is arranged downstream of the filter medium. Thus, the fluid first flows through the filter medium and then flows towards the conductive layer, especially the activated carbon layer. Therefore, wetting and clogging of the conductive layer caused by particles are prevented or at least reduced. This results in an improved filtering effect and an extended service life of the filter element.

[0017] In principle, the conductor can be of any design and / or shape.

[0018] The conductor can be made of, for example, metal or alloy, such as stainless steel. In particular, the conductor can consist of metal or alloy, such as stainless steel.

[0019] An advantageous embodiment is that the conductor has a spring. In particular, the conductor can be configured as a spring. The closing device is coupled to the spring such that the spring is pre-tensioned relative to the filter element in the closed state, and the pre-tension is at least reduced in the installed state. In particular, the pre-tension can be cancelled in the installed state. Thus, reliable electrical contact of the filter element occurs in the closed state, and simplified and especially damage-free installation and / or replacement of the filter element and the conductor occur in the installed state.

[0020] The closing device can be of any design.

[0021] Advantageously, the closure device has a latching mechanism. The latching mechanism has a latching element mounted on the cover and at least one mating latching element mounted at the channel section. In the closed state, the latching element and the at least one mating latching element are locked to each other. Thus, the cover is fixed at the channel section and closes the mounting opening. In the installed state, the latching element and the at least one mating latching element are released from each other. Therefore, the cover can be separated from the channel section to release the mounting opening. The latching element can pivot about a pivot axis on the cover such that the latching element pivots about the pivot axis for adjustment between the closed state and the installed state. A conductor, in particular a spring, is mechanically connected to the latching element such that the conductor pivots when the latching element pivots about the pivot axis. This results in a particularly simple implementation while the filter device is reliably electrically contacted by the conductor with the filter element.

[0022] In particular, the latching mechanism can be configured as a clamping mechanism. The latching element and the at least one mating latching element are designed accordingly.

[0023] In principle, the pivot axis can extend arbitrarily relative to the plugging direction.

[0024] A preferred variant is that the pivot axis extends parallel to the plugging direction in the closed state. In this way, particularly reliable electrical contact of the filter element is achieved in the closed state, and simplified installation and / or simplified replacement of the filter element are achieved in the installed state.

[0025] Advantageously, the conductor, in particular the spring, has a section extending parallel to the pivot axis and connected to the latching element, which section is also referred to hereinafter as the connecting section. In addition, the conductor advantageously has a section extending inclined or transversely to the connecting section, which section is also referred to hereinafter as the contact section. Here, the filter element is touched and thus contacted via the contact section. That is, the conductor touches the filter element via the contact section in the closed state. Therefore, the connecting section and the contact section act about the pivot axis in the manner of an L-shaped or V-shaped lever. As a result, reliable mechanical contact of the filter element in the closed state and simplified installation and / or simplified replacement of the filter element in the installed state are achieved.

[0026] In a preferred refinement according to the idea of the present invention, the filter device is part of a system that also has an ionization device for ionizing the fluid to be filtered (in particular air). This system is also referred to hereinafter as a filtration system. In combination with the ionization of the fluid, in particular air, the filter element, in particular the filter medium (in particular when electrostatically charged by the conductor), exhibits a significantly improved filtering effect on particles over an extended service life.

[0027] The filtration system thus has a filtration device. The system also has a channel including a channel section with the filtration device. Thus, the flow path is guided through this channel. The ionization device has an electrode assembly equipped with an electrode and a counter electrode, and during operation, a voltage exists between the electrode and the counter electrode for corona discharge. Advantageously, the electrode is an injection electrode. Suitably, the flow path is guided through the electrode assembly upstream of the filter element. Here, the filter element is isopotentially electrically connected to the counter electrode by means of a conductor in the closed state.

[0028] Preferably, the electrode, especially the injection electrode, has a negative polarity during operation, for example, between -5 kV and -15 kV, for corona discharge.

[0029] The isopotential connection of the filter element to the counter electrode by means of a conductor can in principle be achieved by a direct electrical connection between the filter element and the counter electrode. It is also conceivable that the counter electrode and the filter element are isopotentially connected by means of a conductor via the voltage source of the filtration system.

[0030] The filtration device and / or the filtration system can be used for any application.

[0031] The filtration device and / or the filtration system can be used, for example, for filtering air in an air-conditioning device.

[0032] In particular, it is conceivable that the filtration device and / or the filtration system, such as an air-conditioning device, is used in a motor vehicle to filter the air to be supplied to the passenger compartment. That is to say, the flow path is guided downstream of the filter element into the passenger compartment.

[0033] Other important features and advantages of the present invention result from the dependent claims, the drawings, and the associated description of the drawings.

[0034] It should be understood that the above-mentioned features and the features to be described below can be used not only in the combinations separately described, but also in other combinations or individually, without departing from the scope of protection of the present invention. Description of the Drawings

[0035] Preferred embodiments of the present invention are shown in the drawings and further elaborated in the following description, wherein the same reference signs denote the same, similar, or functionally identical components.

[0036] Wherein respectively,

[0037] Figure 1 A view schematically showing a highly simplified circuit diagram of the filtration device in the filtration system of a motor vehicle

[0038] Figure 2 A simplified isometric view schematically showing the filtration device with a closing device

[0039] Figure 3 Schematically shows a cross-section of the filter element of the filtering device

[0040] Figure 4 Schematically shows a cross-sectional view of the filtering device

[0041] Figure 5 Schematically shows another cross-sectional view of the filtering device Detailed implementation

[0042] As Figures 1 to 5 Exemplarily shown, the filtering device 1 is used to filter fluids. In the shown embodiment, the filtering device 1 is used to filter air. As Figure 1 Shown, the filtering device 1 can be a component of the filtering system 100, which also has an ionization device 101 for ionizing air

[0043] For example, referring to Figure 1 , the filtering device 1 has a section 2 that is flowed through by air during operation, which is hereinafter also referred to as the channel section 2. As referring to Figure 1 , in the shown embodiment, the channel section 2 is a component of the channel 101 of the filtering system 100, and during operation, air flows through this channel. That is to say, the flow path 300 of the air is guided through the channel 101 and thus through the channel section 2. The filtering device 1 has a filter element 3 arranged in the channel section 2 and the flow path 300 for filtering air. During operation, air flows through the filter element 3 and is filtered therein. As shown only in Figure 3 , the filter element 3 has a filter medium for filtering particles from the air, and the flow path 300 is guided through this filter medium. In the shown embodiment, the filter medium 4 is designed such that it can be electrostatically charged. In the shown embodiment, the filter medium 4 is designed as a corrugated filter material 5, and the flow path 300 is guided through this filter material. The filter medium 4 has corrugations 6, thereby forming corrugation gaps 7

[0044] For installing and / or replacing the filter element 3, an opening 8 as shown, for example, in Figure 1 is formed in the channel section 2, which is hereinafter also referred to as the installation opening 8. Here, the filter element 3 is plugged into the channel section 2 through the installation opening 8 in the direction 400, which is hereinafter also referred to as the plugging direction 400. The filter element 3 can be inserted into the channel section 2 through the installation opening 8 in the plugging direction 400 and can be removed from the channel section 2. Here, the cover 9 of the filtering device 1 closes the installation opening 8 in a releasable manner. The filtering device 1 also has a closing device 10, which is visible in Figure 2 as well as Figure 4 and Figure 5 and Figure 2 andFigure 5 As shown, the closing device 10 can be adjusted between a closed state 11 and a mounting state 12 shown in dashed lines in Figure 2 and Figure 5 . In the closed state 11, the closing device 10 fixes the cover 9 at the channel section 2 such that the cover 9 closes the mounting opening 8. In the mounting state 12, the closing device 10 releases the cover 9 from the channel section 2 such that the cover 9 can be separated from the mounting opening 8 for mounting and / or replacing the filter element 3.

[0045] As Figure 3 shown, in the illustrated embodiment, the pleats 6 of the filter medium 4 and thus the pleat gaps 7 follow one another transversely or obliquely to the plugging direction 400. Additionally, also with reference to Figure 3 , in the illustrated embodiment, the pleats 6 of the filter medium 4 and thus the pleat gaps 7 follow one another transversely to the plugging direction 400. Further, in the illustrated embodiment, the pleats 6 of the filter medium 4 and thus the pleat gaps 7 follow one another transversely to the flow path 300.

[0046] The filter device 1 further has an electrically conductive conductor 13 by means of which the filter element 3 can be electrically contacted. The conductor 13 is arranged on the inner side 14 of the cover 9 that faces the filter element 3 in the closed state 11 (see Figure 5 ). Additionally, the conductor 13 is mechanically coupled to the closing device 10 such that the conductor 13 touches the filter element 3 in the closed state 11 (as Figure 1 , Figure 4 and Figure 5 shown) and is thus in electrical contact, and such that the conductor 13 is further away from the filter element 3 in the mounting state 12 compared to the closed state 11, so that the conductor 13 can be moved relative to the filter element 3 in the plugging direction 400 without damaging the filter medium 4.

[0047] As Figure 4 shown, in the illustrated embodiment, the filter element 3 has an electrically conductive layer 15 applied to the filter medium 4. In the illustrated embodiment, the electrically conductive layer 15 is applied to the filter medium 4 downstream of the filter medium 4. In the illustrated embodiment, the electrically conductive layer 15 is activated carbon, and the electrically conductive layer 15 is thus an activated carbon layer 16. In the closed state 11, the conductor 13 touches the electrically conductive layer 15 here and is thus in electrical contact with the filter element 3. In the mounting state 12, the conductor 13 is further away from the filter element 3 and the electrically conductive layer 15 compared to the closed state 11, so that the conductor 13 can also be moved relative to the filter element 3 in the plugging direction 400 without damaging the electrically conductive layer 15.

[0048] The conductor 13 can have a spring 17. In the illustrated embodiment, the conductor 13 is designed as such a spring 17. Here, the conductor 13 is mechanically coupled to the closure device 10 such that the spring 17 is pre-tensioned relative to the filter element 3 in the closed state 11. Furthermore, in the installed state 12, this pre-tension is at least reduced. In particular, the pre-tension can be cancelled in the installed state 12.

[0049] As Figure 2 shown, in the illustrated embodiment, the closure device 10 has a latching mechanism 18. In the illustrated embodiment, the closure device 10 is the latching mechanism 18. In Figure 2 order to better understand, the cover 9 is not shown. In the illustrated embodiment, the latching mechanism 18 is configured as a clamping mechanism 19. The latching mechanism 18 has a latching element 20 applied to the cover 9. In the illustrated embodiment, the latching element 20 is arranged on the outer side 21 of the cover 9 facing away from the inner side 14 (see Figure 5 ). The latching mechanism 18 also has at least one mating latching element 22 in the channel section 2 (see Figure 2 ). In the illustrated embodiment, the latching mechanism 18 has two such mating latching elements 22. In the closed state 11, the latching element 20 and at least one mating latching element 22 are locked to each other. In Figure 2 the installed state 12 shown by the dashed line, the latching element 20 and at least one mating latching element 22 are released from each other. In order to adjust between the closed state 11 and the installed state 12, the latching element 20 pivots about a pivot axis 500, which pivot axis is as Figure 2 、 Figure 4 and Figure 5 shown. In the illustrated embodiment, the pivot axis 500 extends parallel to the plugging direction 400.

[0050] As Figure 4 and Figure 5 shown, in the illustrated embodiment, the conductor 13 has a connecting section 23 extending parallel to the pivot axis 500 and a contact section 24 extending transversely and / or obliquely to the connecting section 23. In the closed state 11, the conductor 13 touches the filter element 3 here by means of the contact section 24 (in the illustrated embodiment touches the conductive layer 15), and thus electrically contacts the filter element 3. In the illustrated embodiment, in particular with reference to Figure 4 and Figure 5 , in the installed state 12 and thus when the cover 9 is placed on / removed from the installation opening 8, the conductor 13, in particular the contact section 24, is spaced apart from the filter element 3 along the flow path 300. When adjusted to the closed state 11, the conductor 13 moves in the direction of the filter element 3 such that the conductor 13 touches the filter element 3 (in the illustrated embodiment touches the conductive layer 15).

[0051] As Figure 2 and5 As shown, in the illustrated embodiment, the mounting opening 8 has an extension 25 in the region of the conductor 13 which, in the closed state 11, extends laterally beyond the filter element 3 along the flow path 300 in the illustrated embodiment. The extension 25 is designed such that in the mounted state 8 the conductor 13 can be plugged through the extension 25 in the plugging direction 400 and plugged into the channel section 2 spaced apart from the filter element 3 and can be removed from the channel section 2. Thus, damage to the filter element 3 during installation and / or replacement is avoided or at least reduced. The cover 9 has a shaping 26 assigned to the extension 25 (see Figure 5 ), such that the cover 9 closes the mounting opening 8 and the extension 25.

[0052] As shown in the reference Figure 1 , the ionization device 101 has an electrode assembly 103 in the channel 102, which electrode assembly includes an electrode 104 and a counter electrode 105. The electrode 104 can be designed as an injection electrode. Preferably, the electrode 104 has a negative polarity during operation, for example between -5 kV and -15 kV. The flow path 300 guides through the ionization device 101 upstream of the filter element 3. In the illustrated embodiment, the counter electrode 105 is arranged upstream of the electrode 104 in the flow path 300. During operation, a voltage for corona discharge in air is applied between the electrode 104 and the counter electrode 105 by means of a voltage source 106. As Figure 1 shown, in the illustrated embodiment, in the closed state 11, the filter element 3 is isopotentially electrically connected to the counter electrode 105 in the filter system 100 via the conductor 13. This is achieved, for example (also as Figure 1 shown), by an electrical connection of the filter element 3 to the voltage source 106 via the conductor 13.

[0053] The filter device 1, in particular the filter system 100, can be applied in a motor vehicle 200 as Figure 1 shown. In the motor vehicle 200, the air filtered by means of the filter device 1, in particular the filter system 100, can be conveyed to the passenger compartment 201 of the motor vehicle 200. Thus, the flow path 300 guides downstream of the filter element 3 into the passenger compartment 201.

Claims

1. A filtering device (1) for filtering a fluid, in particular air, the filtering device having: - a channel section (2) through which a flow path (300) of the fluid is guided, - a filter element (3) for filtering the fluid, the filter element being arranged in the channel section (2) and in the flow path (300), - Among them, the filter element (3) having a filter medium (4) for filtering particles from the fluid, the flow path (300) being guided through the filter medium, - a mounting opening (8) formed in the channel section (2), the filter element (3) being plugged into the channel section (2) through the mounting opening in a plugging direction (400), - a cover (9) for closing the mounting opening (8), - a closing device (10) which can be adjusted between a closed state (11) and a mounting state (12), - wherein, the closing device (10) fixes the cover (9) to the channel section (2) in the closed state (11) such that the cover closes the mounting opening (8), - wherein the closing device (10) releases the cover (9) relative to the channel section (2) in the mounting state (12) such that the cover (9) can be separated from the mounting opening (8), - wherein the cover (9) has an inner side (14) facing the filter element (3) in the closed state (11), - an electrical conductor (13) arranged on the inner side (14) of the cover (9), the electrical conductor being mechanically coupled to the closing device (10) such that • the conductor (13) touches the filter element (3) in the closed state (11) and is thus in electrical contact with the filter element, • the conductor (13) is farther away from the filter element (3) in the mounting state (12) than in the closed state (11), such that the conductor (13) can move relative to the filter element (3) in the plugging direction (400) without damaging the filter medium (4).

2. The filtering device according to claim 1, characterized in that - the filter element (3) has a conductive layer (15), in particular applied to the filter medium (4), - the conductor (13) touches the layer (15) in the closed state (11) and is farther away from the layer (15) in the mounting state (12) than in the closed state (11), such that the conductor (13) can also move relative to the filter element (3) in the plugging direction (400) without damaging the layer (15).

3. The filtering device according to claim 1 or 2, characterized in that - the conductor (13) has a spring (17), in particular, the conductor is a spring (17), - the closing device (10) is mechanically coupled to the spring (17) such that the spring (17) is pre-tensioned relative to the filter element (3) in the closed state (11), and the pre-tension is at least reduced, in particular cancelled, in the mounting state (12).

4. The filtering device according to any one of claims 1 to 3, characterized in that - The closing device (10) has a latching mechanism (18), in particular a clamping mechanism (19), which has a latching element (20) mounted on the lid (9) and at least one mating latching element (22) mounted at the channel section (2), which are locked to each other in the closed state (11) and released from each other in the installed state (12). - The latching element (20) is pivotable on the lid (9) about a pivot axis (500) such that the latching element (20) pivots about the pivot axis (500) for adjustment between the closed state (11) and the installed state (12). - The conductor (13) is mechanically connected to the latching element (20) such that the conductor (13) pivots when the latching element (20) pivots about the pivot axis (500).

5. The filter device according to claim 4, characterized in that the pivot axis (500) extends parallel to the plugging direction (400).

6. The filter device according to claim 4 or 5, characterized in that the conductor (13) has a connecting section (23) extending parallel to the pivot axis (500) and connected to the latching element (20) and a contact section (24) extending transversely or obliquely to the connecting section (23), and the conductor (13) touches the filter element (3) by means of the contact section (24) in the closed state (11).

7. The filter device according to any one of claims 1 to 6, characterized in that - The mounting opening (8) has an extension (25) that laterally projects beyond the filter element (3) such that the conductor (13) is plugged into the channel section (2) through the extension (25) in the plugging direction (400) in the installed state (12).

8. The filter device according to any one of claims 2 to 7, characterized in that the conductive layer (15) has activated carbon, in particular, the conductive layer is an activated carbon layer (16).

9. The filter device according to any one of claims 2 to 8, characterized in that the conductive layer (15) is arranged downstream of the filter medium (4).

10. A filter system (100) for filtering air, the filter system having: - A filter device (1) according to any one of the preceding claims, - A channel (102) including the channel section (2) of the filter device (1), - An ionization device (101) having an electrode assembly (103), a flow path (300) leading through the ionization device upstream of the filter element (3), - Among them, The electrode assembly (103) has an electrode (104) and a mating electrode (105), and there is a voltage for corona discharge in the air between the electrode and the mating electrode during operation, - wherein the filter element (3) is isopotentially electrically connected to the mating electrode (105) by means of a conductor (13) in the closed state (11).

11. A motor vehicle (200) having a filtering device (1) according to any one of claims 1 to 9, in particular having a filtering system (100) according to claim 10, and having a passenger compartment (201), wherein, The flow path (300) leads downstream of the filter element (3) into the passenger compartment (201).

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