Filter device, air guiding hose, tunnel and use of the filter device

Abstract

The present invention relates to a filtration device (10), particularly for filtering static ambient air, the filtration device having a blower housing (1) including at least one air inlet (11) and at least one air outlet (12), wherein at least one means (4) for generating an airflow is arranged in the blower housing (1), by means of which an airflow from the air inlet (11) to the air outlet (12) can be generated. The filtration device (10) includes at least one flexible air guide hose (2), wherein the air guide hose has a first open end (21) connected to the air outlet (12) of the blower housing (1) and a second closed end (22). In the air guiding hose (2), there is at least one opening (23) between the first end (21) and the second end (22), into which at least one filter element (3) is inserted, wherein the filter element (3) separates the unpurified side (RS) inside the air guiding hose (2) from the clean side (CS) present downstream of the filter element (3), wherein the air guiding hose (2) can be inflated in the operating state by means of a device (4) for generating airflow. Furthermore, the present invention relates to the use of the air guiding hose (2) itself, the tunnel, and the filter device (10) for filtering ambient air in a tunnel.

Description

Technical Field

[0001] The present invention relates to a filtration device (particularly a filter for filtering air in a static environment), an air guiding hose having a filter element, a tunnel (particularly a vehicle or pedestrian tunnel), and the use of a filtration device. Background Technology

[0002] In many large urban areas worldwide, primarily under unfavorable weather conditions (no rain, temperature inversion, minimum wind speed, and no air exchange between different altitudes), the following problems exist: ambient air contains excessive particulate matter and / or gases (such as ozone, NO) due to industrial emissions, traffic, and private fireplaces. x The levels of pollutants (such as CO) are many times higher than the limits. Measures to reduce pollutant concentrations can be taken to either avoid or reduce emissions and / or separate these pollutants from ambient air.

[0003] A concept documented in the prior art involves using a statically installed ambient air purifier to separate airborne pollutants. Such a device typically includes a flow-through housing with an inlet and an outlet, in which one or more blowers and filters are arranged. The filters can be conventional filter elements with porous, breathable filter media and / or electrostatic separators. Advantageously, the ambient air purifier is installed at locations where pollutant concentrations are increased, such as in outdoor spaces, as well as indoor spaces, tunnels, underground stations, bus stations, etc.

[0004] For example, this ambient air purifier is disclosed in DE 20 2016 102 373 U1 as a billboard or in FR 27 87 175 A.

[0005] However, the ambient air purifiers disclosed therein have the following drawbacks: they are bulky and inflexible, and are only suitable to a limited extent for complex (especially curved and / or irregular) installation spaces.

[0006] Based on the prior art, the object of the present invention is to provide a filtration device characterized by a simpler and more flexible construction and good adaptability to complex (especially curved and / or irregular) installation spaces.

[0007] This objective is achieved by a filtering device having the features of independent claim 1.

[0008] Furthermore, the objective is to provide an air-guiding hose with a filter element, by means of which maintenance of the filter device according to the invention can be carried out particularly easily and cleanly.

[0009] This objective is achieved by an air guiding hose with a filter element according to claim 14.

[0010] Finally, the objective is to provide a solution for ambient air filtration in tunnels, characterized by particularly good installation space utilization.

[0011] This objective is achieved by the use of the tunnel according to claim 16 and the filtration device according to claim 17.

[0012] The corresponding dependent claims disclose preferred alternative embodiments. Summary of the Invention

[0013] The filtration device according to the invention is specifically provided for filtering static ambient air and includes a blower housing having at least one air inlet and at least one air outlet. Within the blower housing, at least one means for generating an airflow can be arranged, by means of which an airflow from the air inlet to the air outlet can be generated. The filtration device includes at least one flexible air guide hose having a first open end and a second closed end. The air guide hose is connected to the air outlet of the blower housing via the first open end. At least one opening is provided in the air guide hose between the first and second ends, and at least one filter element is arranged at said opening, the filter element separating the unpurified (raw) side inside the air guide hose from the clean side present downstream of the filter element. The air guide hose can be inflated in the operating state by means of the means for generating the airflow. According to one embodiment, the filter element can be inserted into said at least one opening.

[0014] According to the invention, the air guiding hose has reduced permeability compared to the at least one filter element. In this way, as little unfiltered air as possible escapes through the air guiding hose, and most of the air must pass through the filter element for filtration.

[0015] In an embodiment, the air guiding hose may be airtight, wherein the air guiding hose specifically comprises or is composed of an airtight material.

[0016] Compared to known filtration devices, the configuration of the filtration device according to the invention offers the following advantages: the filtration device can be manufactured with relatively minimal material usage because it is not necessary to use a large number of components (generally steel plates) for air guiding action. Air guiding action is instead provided by an air guiding hose, which is lightweight, flexible, and inexpensive. This has the advantage that the device according to the invention can be easily and flexibly adapted to any installation space through the corresponding design of the air guiding hose, while the blower housing can be used in a variety of different applications with the same configuration. In particular, the filtration device according to the invention can be used in curved and / or irregular installation spaces, such as in or around curved wall structures.

[0017] In another embodiment, the at least one filter element may also be detachably inserted into the air guiding hose. For this purpose, in particular, at least one detachable connecting device may be used, preferably a hook and loop or a magnetic connector.

[0018] In yet another embodiment, the air guide hose may have a receiving frame including an edge in the region of the at least one opening, the edge extending circumferentially around the opening and being securely connected to the air guide hose. The receiving frame may provide an insertion opening into which the at least one filter element can be removably inserted, such that, in this embodiment, the filter element may also be said to be indirectly inserted into the at least one opening of the air guide hose.

[0019] The blower housing can include, for example, a parallelepiped configuration, particularly a cubic configuration. However, it can also have a design that deviates from this, such as having a circular or elliptical base surface.

[0020] The filtration device according to the invention is primarily provided for installation in public outdoor spaces, such as in urban pollutant hotspots, for example, in locations adjacent to roads, particularly in tunnels.

[0021] In a preferred embodiment, the device according to the invention is installed in the operating state such that the blower housing is in a mounting position that is at the bottom in terms of gravity, while the air guide hose extends substantially away from the blower housing in a direction opposite to or at an angle to the direction of gravity.

[0022] In this context, the fluid system (the interaction between the device for generating airflow and the at least one filter element) is configured such that the device for generating airflow can substantially inflate the air guide hose in the operating state, thereby causing the air guide hose to take on a defined shape under internal pressure. Therefore, the air guide hose is preferably designed to be stable relative to internal pressure.

[0023] Air-guided hoses can be manufactured from mesh and / or tubular starting materials using manufacturing methods known from the textile and / or plastics industries, such as stitching and / or welding.

[0024] Advantageously, the air guide hose, together with the at least one filter element, represents a maintenance component in the event of an impending filter element replacement. This has the advantage that the at least one filter element and the air guide structure can be replaced by releasing only one connection (the air guide hose to the air outlet of the blower housing). Furthermore, this ensures clean maintenance; dust and, if necessary, filter cake collected on at least the filter element are securely contained within the air guide hose and thus cannot reach the environment.

[0025] According to a preferred embodiment, the inner cross-sectional area of ​​the air guide hose decreases from the first end to the second end. In this way, it is possible to achieve a targeted effect on local flow resistance along the length extension of the air guide hose; this provides particular advantage in embodiments described herein with more than one filter element, because in this way, it becomes possible to target the same volume of flow rate through the hydraulic regulation of all filter elements.

[0026] In order to purify large volumes of air, the filter device should have a defined minimum size. In this context, the air guide hose may include a length of at least 0.5 m, preferably at least 1.5 m, and more strongly preferably at least 2.5 m. The cross-sectional area of ​​the air guide hose in an expanded (inflated) state (i.e., with the blower running) can be between 0.01 and 0.5 m², preferably between 0.15 and 0.35 m².

[0027] In another embodiment, it may be specified that the at least one filter element is fluid-impermeablely connected (particularly by welding, gluing, and / or crimping) to the edge region surrounding the opening of the air guiding hose. However, connection techniques that appear suitable to those skilled in the art are not excluded; thus, for example, filter elements with corresponding configurations may also be sewn to the edge region by providing suitable collars.

[0028] According to another embodiment, the blower housing may include at least one grille that at least partially spans the air inlet and / or air outlet. The grille provides a safety barrier and retains coarse dust that could otherwise damage the device used to generate the airflow.

[0029] The device used to generate airflow can be an axial, diagonal, or radial blower that can be driven by an electric motor. Other driving actions that appear suitable to those skilled in the art are possible.

[0030] For operation of the electric motor, the filtering device may preferably include an electrical connector. Preferably, the electrical connector can be implemented at a low voltage level. However, the filtering device may also include means that enable connection at a medium voltage level (e.g., connection to a traction power grid).

[0031] According to a particularly preferred embodiment, at least two openings, preferably at least three openings, are provided in the air guiding hose, into which the filter element is inserted respectively. In this context, these openings may be spaced apart along the length of the air guiding hose and / or may be arranged to be positioned opposite each other. Combinations of the foregoing embodiments are also obviously possible.

[0032] According to another embodiment, the filtration device may include a support device that supports the air guide hose at least partially along its length extension, particularly in the non-operating state of the filtration device (i.e., when the device for generating airflow is not generating airflow). The support device is provided to keep the air guide hose in a state of at least partial expansion with respect to its length extension and to prevent it from collapsing; this is useful when restarting the device and can extend the service life of the air guide hose by avoiding kinking.

[0033] The support device can be an internal support frame or inner skeleton, extending inside the air guide hose and connected to the blower housing at least in the region of the first end of the air guide hose. The internal support frame can include, for example, lightweight and highly resilient rods, such as those made of fiber-reinforced plastic composites. Since the air guide hose itself has minimal weight, a rigid and heavy metal structure is not required for this purpose. The inner skeleton of the rods made of fiber-reinforced plastic composites also has the advantage that when installed in an open environment, any wind loads or deformation caused by wind loads on the air guide hose will be absorbed by the rods due to their high elasticity. The internal support frame can be supported inside the air guide hose in the manner of a tent pole.

[0034] Alternatively or additionally, the support device may include an outer support frame that extends outside and surrounds the air guiding hose. In this context, the air guiding hose is preferably secured to the outer support frame at least at its second end, for example, by means of a rope or wire. Alternatively, the air guiding hose may be suspended from the outer support frame. Alternatively, the air guiding hose may be secured to the outer support frame at additional locations along its length extension. For securing by rope and / or wire, the air guiding hose may include one or more eyelets that securely prevent tearing of the hose material due to the securing action.

[0035] According to a particularly preferred embodiment, the support device may include at least one joint along its length extension, the joint having at least one rotational degree of freedom. The at least one joint divides the support device into individual support device segments that are pivotable relative to each other. In this context, the pivot axis of the at least one joint or hinge preferably extends perpendicular to the length extension. According to another preferred embodiment, the support device may include more than one joint along its length extension, such as two, three, four, or even more joints. In this context, it may also be specified that the pivot axes of the individual joints are different. However, a preferred embodiment is one in which the pivot axes of all joints extend parallel. This embodiment achieves adaptability to complex installation spaces, even for filter devices with support frames, which has been unknown in the prior art to date.

[0036] According to another embodiment, the support section of the outer support frame can at least partially accommodate the blower housing. The support section that at least partially accommodates the blower housing can advantageously serve as a support base for the filter device, and for this purpose, its dimensions should be set to have sufficient overhang to reliably absorb the tilting moment caused by the weight of the air guide hose, filter element, and support device, as well as wind and snow loads if necessary.

[0037] According to an additional embodiment, the at least one filter element may include at least one pleated bellows of a filter medium. The filter medium may optionally include at least one adsorbent for adsorbing a predetermined pollutant gas, such as NO. x CO, NH3. The adsorbent can be at least activated carbon and / or zeolite. The adsorbent can be particularly part of the filter medium and can exist in the filter medium as a packing material in the form of one or more layers. Alternatively or additionally, the filter element can have a polygonal shape, especially a parallelepiped shape.

[0038] Alternatively or additionally, the filter element may include a main filter element and a pre-filter element (particularly a nonwoven mat) arranged upstream along the flow direction, wherein the main filter element is particularly specifically implemented as a pleated bellows having at least a filter medium. Alternatively or additionally, the filter element may be a filter element corresponding to at least 75% of the particle filtration classification ePM10 according to ISO 16890. The filter element may particularly be a flat filter element with a minimum width and / or minimum length of 100 mm, preferably 200 mm, and even more preferably at least 300 mm. The pleat height of the pleated bellows may be at least 15 mm, preferably at least 25 mm, and more preferably at least 35 mm.

[0039] According to another preferred embodiment, the blower housing may include at least two air outlets, with air guide hoses connected to each of the air outlets. The air outlets may be located on opposite sides of the blower housing, resulting in a configuration in which air guide hoses originating from the blower housing extend away from each other. This arrangement can be advantageous when the filtration device according to the invention is to be installed in a ceiling area of ​​a room or tunnel, as fresh air can be supplied to two spatially separated areas using a common blower housing.

[0040] Furthermore, it can be specified that the air guide hose is connected to at least one air outlet opening of the blower housing via a detachable hose connector. This facilitates maintenance (replacement of the filter element) because the air guide hose and the filter element (along with the air guide hose) can be separated from the blower housing by a single operation (removing the hose connector).

[0041] In this context, the hose interface may include a first interface portion at the blower housing and a second interface portion at a first end of the air guide hose, wherein, preferably, the hose interface includes at least one threaded and / or bayonet connection element. Alternatively or additionally, the corresponding first and second interface portions may also include a key-lock code to prevent incorrect installation of the air guide hose (e.g., incorrect length of the filter element, incorrect filter parameters).

[0042] A particularly preferred embodiment specifies that the air guiding hose comprises or is composed of a single or multiple layers of fabric and / or membrane material, with a thickness ranging from 0.05 to 5 mm, preferably from 0.1 to 2 mm. This membrane material offers a good trade-off between its own weight, abrasion resistance, and internal pressure stability. Particularly preferred materials are thermoplastic materials such as polypropylene, polyethylene, polystyrene, polyamide, polyvinyl chloride, polyethylene terephthalate, and polyoxymethylene.

[0043] Alternatively or additionally, the air guiding hose may include at least one inwardly positioned flow guide structure, preferably composed of a single or multiple layers of fabric and / or membrane material. Advantageously, due to the at least one inwardly positioned flow guide structure, at least two compartments are formed within the air guiding hose, the compartments being at least partially closed inward relative to each other. Hydraulic adjustment can also be achieved by one or more flow guide structures in embodiments where multiple filter elements are arranged adjacent to each other along the direction of the length extension, similar to the manner described herein where the air guiding hose tapers towards its second end, wherein, for this purpose, the flow cross-section provided by the flow guide structure(s) may be locally narrowed in a targeted manner on the inside. The flow guide structure may be oriented perpendicular to the length extension or may be positioned at a predetermined angle relative to the normal. In a simple and inexpensive manner, such a flow guide structure may be manufactured by sewing or welding it into the intermediate wall of the air guiding hose.

[0044] According to another embodiment, an air guide sleeve is provided at the blower housing to surround the at least one air outlet opening, extending at least partially into the air guide hose along its length. Preferably, the air guide sleeve tapers gradually away from the blower housing. The air guide sleeve offers the technical advantages of guiding effluent in a targeted manner into the interior of the hose and mitigating flow effects at the interface area where the air guide hose connects to the blower housing. Furthermore, the gradually tapering (particularly conical) configuration of the air guide sleeve has the advantage of minimizing the risk of dust (which has accumulated in the area surrounding the air outlet opening during operation) falling into the air outlet sleeve during maintenance and potentially damaging the airflow generation devices in the blower housing.

[0045] According to an advantageous alternative embodiment, the air guide sleeve may consist of a single or multiple layers of fabric and / or membrane material. The air guide sleeve may be fastened to the blower housing, or it may be part of the air guide hose so that it can be replaced during maintenance. Advantageously, however, the air guide sleeve is composed of a material with greater inherent stiffness than the material of the air guide hose, so that the air guide hose does not collapse even in a non-operating state and can provide its protective function.

[0046] Another aspect of the invention relates to an air guiding hose having at least one filter element for a filtering device according to any of the preceding claims, wherein the air guiding hose is designed to be flexible and includes a first open end for connection to an air outlet of a blower housing of the filtering device, and includes a second closed end. At least one opening is provided between the first and second ends in the air guiding hose, into which at least one filter element is inserted.

[0047] According to the present invention, the air guiding hose has reduced air permeability compared to the at least one filter element.

[0048] Specifically, the air guiding hose includes an interface portion of a hose interface at its first end, preferably at least one threaded and / or bayonet connection element, the interface portion including a predetermined key lock code.

[0049] Finally, the last aspect of the invention relates to a tunnel, particularly a vehicle tunnel, such as a rail vehicle tunnel or a pedestrian tunnel. The tunnel includes a tunnel floor, a tunnel ceiling, and at least one tunnel wall, wherein the tunnel wall may include a curved cross-sectional shape. A filtration device according to the invention is arranged at or within the at least one curved tunnel wall. Due to its flexible configuration and excellent adaptability to complex (particularly curved) installation spaces, the filtration device according to the invention is perfectly received within or at the curved tunnel wall. It can be particularly integrated into the hollow space between the tunnel support structure (building shell) and the tunnel cladding, such that it does not protrude beyond the tunnel cladding and does not restrict the structural clearance of the tunnel.

[0050] Compared to known tunnels without filtration devices, tunnels according to the invention offer significantly improved air quality, which is particularly important in tunnels frequently used by people (e.g., in tunnel train stations). Conventional tunnel train stations (especially subway stations) are often loaded with air pollutants (such as PM2.5 and / or PM5 and / or PM10) at levels many times higher than the corresponding limits for outdoor air. This can be avoided in a simple and almost "invisible" manner with tunnels according to the invention.

[0051] Another aspect of the invention relates to the use of a filtration device according to the invention for filtering ambient air in a tunnel. Attached Figure Description

[0052] Further advantages are described below with reference to the accompanying drawings, which illustrate embodiments of the invention. The drawings, description, and claims contain numerous features in combination. Those skilled in the art will also expediently consider these features individually and combine them into other expedient combinations.

[0053] As shown in the example:

[0054] Figure 1 This is a front view of the filtering device according to the invention based on the first embodiment;

[0055] Figure 2a This is a side view of the filtering device according to the invention based on the first embodiment;

[0056] Figure 2b It is based on Figure 2a A side view with directional arrows;

[0057] Figure 3 This is a front view of the filtering device according to the invention based on the second embodiment;

[0058] Figure 4 This is a side view of the filtering device according to the invention based on the second embodiment;

[0059] Figure 5 This is a front view of the filtering device according to the invention based on the third embodiment;

[0060] Figure 6 This is a longitudinal sectional view of the filter device according to the invention based on the third embodiment;

[0061] Figure 7a This is a front view of the filtering device according to the invention based on the fourth embodiment;

[0062] Figure 7b This is a longitudinal sectional view of the filter device according to the invention based on the fourth embodiment;

[0063] Figure 8 This is a longitudinal sectional view of the air guiding hose according to the invention based on the first embodiment;

[0064] Figure 9 This is a longitudinal sectional view of the air guiding hose according to the invention in accordance with the second embodiment;

[0065] Figure 10 This is a longitudinal sectional view of the filter device according to the invention based on the fifth embodiment. Detailed Implementation

[0066] In the figures, the same or similar parts are identified using the same reference numerals. These figures are merely examples and should not be construed as limiting.

[0067] In the first embodiment, in Figure 1A front view illustration shows a filtration device 10 according to the invention. It includes a blower housing 1 having an air inlet opening 11 and an air outlet opening 12. A flow path is formed between the air inlet opening 11 and the air outlet opening 12, in which a device 4, preferably a blower (particularly a radial blower), for generating an airflow is located downstream of the air inlet opening 11 and upstream of the air outlet opening 12. The device 4 for generating the airflow draws in air through the air inlet opening 11 during operation and blows it out under pressure from the air outlet opening 12. An air guide hose 2 is fluidly secured to the edge surrounding the air outlet opening 12 of the blower housing 1 or fluidly connected to an air outlet sleeve (not shown) via its first open end 21, such that air blown from the air outlet opening 12 is guided into the interior of the air guide hose 2. At a second end 22 opposite to the first end 21, the air guide hose 2 is in a closed configuration. The air guiding hose 2 is made of a flexible material (e.g., a single or multiple layer of film and / or fabric material) and can be inflated by means of a blower 4 in the operating state. When the blower is not operating, the air guiding hose 2 collapses due to its minimum self-stiffness. (The last sentence appears to be incomplete and possibly refers to a different process.) Figure 3 Measures to avoid such collapse are disclosed in the general part of the specification and in the claims.

[0068] The air guiding hose 2 has three openings 23 into which filter elements 3 are inserted respectively. Each filter element 3 is connected to the edge of the opening, i.e., to the material of the air guiding hose 2. The filter elements 3 can be connected to the air guiding hose 2, for example, by gluing, welding, or sewing. Each filter element 3 has at least one filter medium configured to filter out certain particulate matter and / or contaminant gases from the air. The filter medium may be present in a folded bellows or in a flat shape. Furthermore, a pre-filter element may be provided, arranged upstream of the (main) filter element along the flow direction.

[0069] exist Figure 2a The filter device 10 is shown in a side view, in which it can be seen that the cross-sectional area of ​​the air guide hose 2 gradually tapers along the flow direction (i.e., from the first end 21 to the second end 22), resulting in an approximation of A1 > A2 > A3. This has the following effects: in this way, the flow through each filter element 3 is more uniform, resulting in a more even distribution of dust load across all filter elements 3, and all filter elements have approximately the same service life. Furthermore, due to the smaller surface area, this configuration provides material savings for the air guide hose 2, allowing it to be manufactured more cost-effectively.

[0070] exist Figure 2bThe diagram schematically illustrates the flow through the filter device 10. Air flows from the environment U into the air inlet opening 11 of the blower housing 1, passes through the device 4 for generating airflow to the outlet opening 12 of the blower housing 1, and from there enters the interior of the air guide hose 2, where the unpurified side RS exists. The air is then guided through the various filter elements 3 to the clean side CS and thus returns to the environment U.

[0071] The filter device 10 according to the invention is not only particularly flexible and easily adaptable to complex (especially curved and / or otherwise irregular) installation spaces, but also allows for surprisingly clean maintenance operations (i.e., replacement of the air guide hose). In maintenance situations, the removable attachment of the first open end 21 of the air guide hose 2 is removed from the air outlet opening 12 or the air outlet sleeve of the blower housing 1, and the air guide hose 2 can then be folded essentially like a bag, wherein the separated particles located on the unpurified side remain inside the air guide hose 2.

[0072] In its simplest form, the attachment of the air guide hose 2 at the air outlet opening 12 or at the air outlet sleeve of the blower housing 1 can be achieved by a hose clamp that surrounds the air outlet sleeve when the air guide hose 2 is compressed. Alternatively, a detachable hose interface can be provided, comprising a first interface portion at the blower housing and a second interface portion at the first end of the air guide hose. However, this is not illustrated in the accompanying drawings.

[0073] exist Figure 3 The filter device 10 according to the second embodiment is shown in the previous view. Regarding the basic configuration, which corresponds to the first embodiment, only the differences will be explained here for this purpose. To prevent the air guide hose 2 from the described "collapse" in the non-operating state of the blower 4, the filter device 10 is provided with a support device in the form of an outer support frame 5. The air guide hose 2 is connected to the outer support frame 5, for example by means of a rope or wire, at least in the region of its second end 22. To attach the rope or wire to the air guide hose 2, at least one reinforcing eyelet can be inserted into the material of the air guide hose 2. Optionally, the air guide hose 2 can also be fastened to the outer frame support 5 at an additional location; however, this outer frame support is not shown in the figures. The outer support frame 5 includes four support segments 51-54, each formed as a parallelepiped frame. Each support segment 51-54 is connected to each other by at least one hinge or joint 50 having one degree of rotational freedom. Therefore, each support segment 51-54 can be tilted relative to each other, which... Figure 4The diagram shows that the axes of rotation of connector 50 are all parallel to each other. However, in an embodiment not shown in the diagram, the axes of rotation of connector 50 may also be positioned at an angle to each other.

[0074] This tilting action of the support device sections 51-54 allows the filter device 10 to adapt to curved installation spaces, such as in tunnel walls; the air guide hose 2 adapts to any tilting action of the support device sections 51-54 because it is embodied in a flexible (film) material according to the invention.

[0075] exist Figure 5 The illustration shows another (third) embodiment of the filter device 10 according to the invention. It differs from the second embodiment in that it includes a permeable grille 6 covering the air inlet opening 11. The grille 6 prevents the entry of foreign objects and, for safety reasons, restricts access to the interior of the blower housing 1. Figure 6 The third embodiment is shown in a longitudinal sectional view.

[0076] Figure 7a and Figure 7b A filtration device 10 according to the invention, based on a fourth embodiment, is shown. It differs from the previously described variant in that the blower housing 1 includes two air outlet openings 12, each with an air guide hose 2 connected thereto. The two air outlet openings 12 are supplied with air from a common air inlet opening 11. The air outlet openings 12 are located on opposite sides of the blower housing 1. This embodiment can, of course, be arbitrarily combined with features of other embodiments; in this way, particularly for this embodiment, a support device (internal or external) can be provided to support the air guide hoses 2 when the blower 4 is not in operation. The filtration device 10 according to the fourth embodiment has the advantage of providing filtered air bidirectionally. For example, the filtration device 10 can be installed in the ceiling area of ​​a tunnel, where the blower housing 1 is located at the ceiling of the tunnel, and the two air guide hoses 2 can extend along the tunnel wall, thus providing fresh air to areas where people may be present. In another embodiment not shown in the accompanying drawings, the filter device 10 may also include more than two air outlet openings 12 having more than two air guide hoses 2, which may, for example, be present around the entire circumferential portion of the blower housing 1.

[0077] exist Figure 8 and Figure 9 The diagram illustrates an air guiding hose 2 according to the present invention, which has at least one filter element 3. Figure 8 It includes three openings 23, each opening being provided with a filter element 3, and according to... Figure 9It includes two openings 23, each housing a filter element 3. At the first end 21, the air guide hose 2 is open for connection to the air outlet opening of the blower housing of the filter unit, while the second end 22 is specifically implemented as closed. The cross-section of the air guide hose can be polygonal, particularly rectangular, circular, elliptical, star-shaped, or otherwise designed. Due to the flexible material of the air guide hose 2, there are virtually no limitations regarding the variety of shapes. At the first end 21, in particular, a second interface portion may be present, providing a quick connection to the first interface portion at the blower housing. In this context, the second interface portion may include at least one threaded and / or bayonet connection element and / or a predetermined keying code, thereby preventing the installation of incompatible filter elements.

[0078] Finally, Figure 10 The diagram illustrates a fifth embodiment, which, in terms of its basic configuration, corresponds to the embodiment based on... Figure 6 The third embodiment. However, at the air outlet opening 12 of the blower housing 1, an air guide sleeve 121 is provided, which extends axially in part into the interior of the air guide hose 2. The air guide sleeve 121 tapers gradually in the direction opposite to the blower housing 1 (along the flow direction), and thus provides flow focusing, which prevents the connection area of ​​the air guide hose 2 from being overloaded in the region of the first end 21 of the air guide hose due to the dynamic effects of the flow. In addition, various flow guiding structures 24 are provided in the air guide hose 2, which are preferably formed of the material of the air guide hose 2 and protrude into the interior of the air guide hose 2. The flow guiding structure 24 is designed as a circumferentially extending intermediate wall, but with an open central flow cross section. Similar to the process of tapering in the axial direction, the flow guiding structure 24 is used to accommodate the flow resistance in the axial direction, with the aim of achieving a more uniform flow through the filter element 3. For this purpose, the distance by which the flow guide structure 24 protrudes into the interior between the first compartment 25a and the second compartment 25b is less than the distance by which the flow guide structure 24 protrudes into the interior between the second compartment 25b and the third compartment 25c. Of course, these two measures (air guide sleeve 121 and flow guide structure 24) can be used not only in combination but also individually.

[0079] List of reference numerals

[0080] 1. Blower casing

[0081] 11 Air inlet opening

[0082] 12 Air outlet opening

[0083] 121 Air guide sleeve

[0084] 2. Air guiding hose

[0085] 21 First Opening End

[0086] 22 Second closed end

[0087] 23. Opening of the air guiding hose

[0088] 24. Flow guiding structure

[0089] 25 Compartments for air guiding hoses

[0090] 3 Filter elements

[0091] 4. Devices / blowers for generating airflow

[0092] 10 Filtration device

[0093] A n Local cross-sectional area of ​​air guiding hose

[0094] 5. Support device / external support frame

[0095] 51-54 Support Device Section

[0096] 50 Joints / Hinges

[0097] 6 grilles

[0098] CS clean side

[0099] RS Unpurified Side

[0100] U Environment

Claims

1. A filtering device (10) having a blower housing (1) including at least one air inlet (11) and at least one air outlet (12), wherein, In the blower housing (1), at least one device (4) for generating an airflow is arranged, by means of which an airflow from the air inlet (11) to the air outlet (12) can be generated. The filter device (10) is characterized in that it includes at least one flexible air guide hose (2), wherein the air guide hose (2) has an open first end (21) connected to the air outlet (12) of the blower housing (1) and a closed second end (22), wherein there is at least one opening (23) in the air guide hose (2) between the first end (21) and the second end (22), and at least one filter element (3) is arranged at the opening, wherein the filter element (3) separates the unpurified side (RS) inside the air guide hose (2) from the clean side (CS) arranged downstream of the filter element (3), wherein the air guide hose (2) can be inflated in the operating state by means of the device (4) for generating the airflow and includes reduced permeability compared to the at least one filter element (3).

2. The filtration device (10) according to claim 1, characterized in that, The air guiding hose (2) is airtight.

3. The filtration device (10) according to claim 2, characterized in that, The air guiding hose (2) comprises or is composed of an airtight material.

4. The filtration device (10) according to claim 1, characterized in that, The inner cross-sectional area (A1-A) of the air guiding hose (2) n The decrease is from the first end (21) to the second end (22).

5. The filtration device (10) according to claim 1, characterized in that, The at least one filter element (3) is fluid-impermeable to the edge region surrounding the opening (23) of the air guide hose (2).

6. The filtration device (10) according to claim 5, characterized in that, The at least one filter element (3) is welded, glued and / or crimped to the edge region surrounding the opening (23) of the air guide hose (2).

7. The filtration device (10) according to claim 1, characterized in that, At least two openings (23) are provided in the air guiding hose (2), each opening having a filter element (3) arranged thereon.

8. The filtration device (10) according to claim 7, characterized in that, At least three openings (23) are provided in the air guiding hose (2).

9. The filtration device (10) according to claim 7, characterized in that, The openings (23) are spaced apart along the length of the air guiding hose (2) and / or arranged to be positioned opposite each other.

10. The filtration device (10) according to claim 1, characterized in that, The filter device (10) includes a support device (5) that supports the air guide hose (2) at least partially along its length extension.

11. The filtration device (10) according to claim 10, characterized in that, The support device (5) includes an inner support frame that extends inside the air guide hose (2) and is connected to the blower housing (1) at least in the region of the first end (21) of the air guide hose (2).

12. The filtration device (10) according to claim 10, characterized in that, The support device (5) includes an outer support frame (5) that extends outside the air guiding hose (2) and surrounds the air guiding hose, wherein the air guiding hose (2) is fastened to the outer support frame (5) at least at its second end (22).

13. The filtration device (10) according to claim 12, characterized in that, The air guiding hose (2) is secured to the outer support frame (5) by means of a rope or wire at least at its second end (22).

14. The filtration device (10) according to claim 1, characterized in that, The at least one filter element (3) includes at least one pleated bellows of filter medium.

15. The filtration device (10) according to claim 14, characterized in that, The filter medium includes at least one adsorbent.

16. The filtration device (10) according to claim 15, characterized in that, The filter media includes activated carbon and / or zeolite.

17. The filtration device (10) according to claim 14, characterized in that, The filter element (3) has a polygonal shape.

18. The filtration device (10) according to claim 17, characterized in that, The filter element (3) has a parallelepiped shape.

19. The filtration device (10) according to claim 1, characterized in that, The blower housing (1) includes at least two air outlets (12), each air outlet having an air guide hose (2) connected thereto.

20. The filtration device (10) according to claim 19, characterized in that, The air outlet (12) is located on the opposite sides of the blower housing (1).

21. The filtration device (10) according to claim 1, characterized in that, The air guide hose (2) is connected to at least one air outlet (12) of the blower housing (1) by means of a detachable hose interface.

22. The filtration device (10) according to claim 21, characterized in that, The hose interface includes a first interface portion at the blower housing (1) and a second interface portion at the first end (21) of the air guide hose (2).

23. The filtration device (10) according to claim 22, characterized in that, The hose interface includes at least one threaded and / or bayonet connection element.

24. The filtration device (10) according to claim 23, characterized in that, The at least one threaded and / or bayonet connection element includes a predetermined key lock code.

25. The filtration device (10) according to claim 1, characterized in that, The air guiding hose (2) includes at least one inwardly positioned flow guiding structure (24).

26. The filtration device (10) according to claim 25, characterized in that, The at least one inwardly positioned flow guiding structure is composed of a single or multiple layers of fabric and / or membrane material.

27. The filtration device (10) according to claim 25, characterized in that, At least two compartments are formed within the air guiding hose (2) by means of the at least one inwardly positioned flow guiding structure (24), the compartments being at least partially closed inward relative to each other.

28. The filtration device (10) according to any one of the preceding claims, characterized in that, The filtration device is used for filtering static ambient air.

29. An air guiding hose (2) having at least one filter element (3) for use with a filter device (10) according to any one of the preceding claims, wherein, The air guiding hose (2) is specifically implemented as flexible and has an open first end (21) of the air outlet (12) of the blower housing (1) of the filter device (10) and a closed second end (22), wherein at least one opening (23) exists in the air guiding hose (2) between the first end (21) and the second end (22), at least one filter element (3) is arranged at the opening, wherein the air guiding hose (2) has reduced permeability compared to the at least one filter element (3).

30. The air guiding hose (2) according to claim 29, characterized in that, The air guiding hose (2) includes an interface portion of the hose interface at the first end.

31. The air guiding hose (2) according to claim 30, characterized in that, The air guiding hose (2) includes at least one threaded and / or bayonet connection element at the first end.

32. The air guiding hose (2) according to claim 31, characterized in that, The threaded and / or bayonet connection elements include predetermined locking key codes.

33. A tunnel comprising a tunnel floor, a tunnel ceiling, and at least one tunnel wall, wherein, A filtration device (10) according to any one of the preceding claims is arranged in or within the at least one tunnel wall.

34. The tunnel according to claim 33, wherein the tunnel wall has a curved cross-sectional shape.

35. The tunnel according to claim 33, wherein the tunnel is a vehicle tunnel or a pedestrian tunnel.

36. The tunnel according to claim 35, wherein the tunnel is a rail vehicle tunnel.

37. Use of a filtration device (10) according to any one of the preceding claims for filtering ambient air in a tunnel.

38. The use of the filtration device (10) according to claim 37, wherein, The tunnel is the tunnel described in claim 33.

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