Filtering device and method of cleaning a filter element of a filtering device

Abstract

The invention relates to a filter device, comprising at least one filter element designed to filter a raw fluid and having a raw fluid side and a cleaning fluid side, the filter element having a cleaning fluid outlet arranged on the cleaning fluid side and extending in a first plane, and the cleaning fluid being guided out of the filter element through the cleaning fluid outlet, and at least one compressed air cleaning device adapted to generate pressure pulses for cleaning foreign matter adhering to the filter element and to direct the pressure pulses to the filter element through the cleaning fluid outlet, wherein the compressed air cleaning device is adapted to direct the pressure pulses at least approximately along the first plane to the cleaning fluid outlet.

Description

[0001] This invention is a divisional application of application number 202080084083.0 filed on October 13, 2020, entitled "Filtering device and method for cleaning filter element of filtering device". Technical Field

[0002] The present invention relates to a filtration device and a method for cleaning the filter element in the filtration device. Background Technology

[0003] Such filtration devices are used in factories and plants across various industrial sectors, such as in the automotive, chemical, and food industries, or in the production of building materials.

[0004] The filtration device according to the invention includes at least one filter element and a compressed air cleaning device. The at least one filter element is designed for filtering a raw fluid and has a raw fluid side and a clean fluid side. The compressed air cleaning device is designed for generating compressed air pulses for cleaning or removing foreign matter adhering to the filter element.

[0005] The filter element has at least one clean fluid outlet arranged on the clean fluid side, through which the filtered clean fluid is discharged from the filter element.

[0006] In conventional filtration devices, multiple compressed air injectors are associated with the filter element, each of which is arranged adjacent to the clean fluid outlet. In this way, compressed air is injected directly into the filter element in the opposite direction to the flow direction of the clean fluid and passes through the clean fluid outlet without deflection.

[0007] A filtration device including a cleaning mechanism is known from EP2091632B1. The filtration device includes a tubular filter element made of metal, glass, or ceramic, arranged within a filter housing. The cleaning mechanism operates using compressed air to remove impurities from the tubular filter element. The compressed air inlet of the cleaning mechanism is arranged within the filter housing such that it terminates directly via a cleaning fluid collection channel and is not bent before the cleaning fluid outlet of the tubular filter element. Summary of the Invention

[0008] The object of the present invention is to provide a filtration device that can perform less complicated cleaning of the filter element with at least equal cleaning results.

[0009] The filtration device according to the invention comprises: at least one filter element adapted to filter a raw fluid and having a raw fluid side and a clean fluid side; and at least one compressed air cleaning device. The filter element has a clean fluid outlet disposed on the clean fluid side and extending in a first plane, through which clean fluid is directed out of the filter element. The compressed air cleaning device is adapted to generate pressure pulses for cleaning foreign matter or contaminants adhering to the filter element and directs the pressure pulses through the clean fluid outlet to the filter element. The compressed air cleaning device is adapted to direct the pressure pulses at least substantially along the first plane to the clean fluid outlet.

[0010] The cleaning fluid is generated from the raw fluid that has passed through the filter element and is loaded with particulate contaminants. These particulate contaminants accumulate on the raw fluid side of the filter element. To periodically remove these particulate contaminants from the filter element, the compressed air cleaning device generates pressure pulses that travel against the flow direction of the cleaning fluid away from the filter element and are coupled into the filter element through the cleaning fluid outlet. This principle is also known as the counter-current pulse or reverse pressure pulse principle.

[0011] Conventionally, each filter element, or each cleaning fluid outlet opening of a filter element, is associated with its own arrangement for injecting compressed air. The filter element is arranged on the cleaning fluid side such that it can be subjected to compressed air to separate material deposited on the filter element on the original fluid side. Typically, compressed air is applied to the filter element in such a cleaning cycle, which has been executed at specific time intervals between normal filter operation cycles. The compressed air cleaning device according to the invention is designed such that the pressure pulse generated by the compressed air cleaning device moves toward the filter element on the cleaning fluid side, against the flow direction of the cleaning fluid leaving the filter element. In particular, the flow of the cleaning fluid leaving the filter element can be used as a carrier fluid for the generated pressure pulse for cleaning, which moves against the flow direction of the cleaning fluid. It is not necessary to interrupt the currently running filter operation cycle. The pressure pulse does not directly impact the cleaning fluid outlet opening of the filter element, but arrives at the cleaning fluid outlet opening from the side, such that the pressure pulse undergoes a change in direction as it passes through the cleaning fluid outlet opening. This change in direction can be very significant, and has yielded particularly advantageous results when the pressure pulse is directed to the filter element in such a way that the pressure pulse undergoes a change in direction as it enters through the cleaning fluid outlet opening. This change is within a range close to 90°, for example, between 60° and 120°, particularly 70° to 110°, and especially 80° to 100°. A particularly preferred deflection angle is 90°, or any range approaching 90° at any rate, such as 85° to 95°. In this case, the pressure pulse propagates at least near the cleaning fluid outlet opening in a direction generally parallel to the plane in which the cleaning fluid outlet opening extends. In this way, the effective cross-sectional area of ​​the cleaning fluid outlet opening is very small in the projection of the incoming pressure pulse. In extreme cases, when the pressure pulse approaches the cleaning fluid outlet opening in a direction parallel to the plane in which the cleaning fluid outlet opening extends, and when the pressure pulse passes through the cleaning fluid outlet opening at a right angle, this projection can even be zero, or at least approximately zero. It has been found that even under such conditions, very satisfactory cleaning results can be obtained for the filter element without requiring significantly more energy to generate the pressure pulse. Clearly, it is possible for the pressure pulse to be coupled into the filter element through the cleaning fluid outlet opening, and for the pressure pulse to be transmitted from the cleaning fluid side to the filter element, causing particulate matter adhering to the filter element on the original fluid side to fall off the filter element.

[0012] The main advantage of the arrangement of the compressed air cleaning device according to the present invention is that a single pressure pulse can approach multiple cleaning fluid outlet openings at nearly the same angle. In particular, these multiple cleaning fluid outlet openings can be arranged one after another along the direction of travel of the pressure pulse. In this way, a single pressure pulse of the compressed air cleaning device can be coupled therein via multiple cleaning fluid outlet openings of filter elements arranged one after another and / or multiple filter elements arranged one after another and side by side, such that by applying the same pressure pulse, material deposited on the original fluid side can be caused to fall off in all filter elements. In the case of filter elements with a bag-like configuration, there are multiple cleaning fluid discharge areas in the bag-like configuration, each having its own cleaning fluid outlet opening, in which a single pressure pulse of the compressed air cleaning device can be individually coupled. Multiple such filter elements can even be arranged in series, such that the pressure pulse reaches the cleaning fluid outlet openings of all filter elements sequentially. Furthermore, multiple filter elements, each with its own cleaning fluid outlet opening, and / or multiple such cleaning fluid outlet openings of a single filter element, can be arranged adjacent to each other, allowing pressure pulses to reach even cleaner fluid outlet openings. For example, multiple filter elements, each with its own cleaning fluid outlet opening, and / or four or five cleaning fluid outlet openings of a single filter element can be arranged one after another; and multiple filter elements, each with its own cleaning fluid outlet opening, and / or three cleaning fluid outlet openings of a single filter element can be arranged adjacent to each other. In this way, the filter element or filter elements can be cleaned extremely effectively by means of pressure pulses acting sequentially on all cleaning fluid outlet openings. In operation, it is generally ensured that pressure pulses act on the cleaning fluid outlet openings at repetitive intervals to perform a cleaning cycle on the associated filter element or associated area of ​​the filter element in each case.

[0013] At least generally along the first plane, this includes angles with respect to the direction of the pressure pulse path and the first plane that are at most ±30°, particularly at most ±20°, and especially at most ±10°. Even though the pressure pulse must pass through the relatively narrow clean fluid outlet of the filter element, and is further strongly deflected at this location to enter the clean fluid space of the filter element through the clean fluid outlet opening, i.e., 60° to up to 90°, satisfactory cleaning of the filter element is possible even with this orientation of the pressure pulse path. As an alternative to the above description, it can be said that the compressed air pulse path in the region near the first plane extends at an angle of + / - 30° relative to the normal vector of the first plane, particularly at an angle of + / - 20°, and especially at an angle of + / - 10°.

[0014] At least one filter element can be designed as a rigid-body filter. In a rigid-body filter, the materials and configuration are selected so that the filter element can be set up by itself, i.e., without the aid of an external support structure. This requires the filter element to have a filter body with some inherent rigidity. Rigid-body filters have a long service life and are characterized by effective filtration performance. Specifically, rigid-body filters are well-suited for cleaning by compressed air cleaning devices because the rigid-body filter itself can withstand and transmit pressure pulses well.

[0015] At least one filter element may include a filter body that is porous to allow flow through it, i.e., a flow-through porous filter body made of sintered material, wherein the sintered material specifically includes sintered plastic as a main component, particularly sintered polyethylene particles or (for applications at higher operating temperatures) sintered polyphenylene sulfide particles as a main component.

[0016] The filter element may be configured as a filter bag or filter cartridge, having sidewalls that enclose a clean fluid space and an open end face forming a clean fluid outlet, as well as a closed end face opposite the clean fluid outlet. The clean fluid is collected in the clean fluid space after passing through the walls of the filter element and is then conveyed out of the filter element through the clean fluid outlet. The filter bag or filter cartridge may have three, particularly four, sidewalls and at least one bottom wall, with the at least one bottom wall connecting the sidewalls to each other at the bottom end opposite the clean fluid outlet.

[0017] Filter elements (specifically, in the form of filter bags or filter cartridges) may have a box-like shape with two narrow sidewalls and two wide sidewalls extending from a clean fluid outlet to an opposing, closed bottom end. The bottom end may be closed by a bottom end wall. Alternatively, the sidewalls may be inclined relative to each other such that they contact each other at the end opposite the clean fluid outlet, thereby closing the end. The clean fluid outlet is typically formed in the top wall of the filter element. Such filter elements may have an angular cross-section, or a cross-section and / or side surfaces with rounded corners. Filter elements may also be tubular in shape, in which case the cross-section of the filter element may be elliptical or circular.

[0018] The filter element can be arranged such that, in particular, two wide sidewalls extend parallel to the flow direction of the cleaning fluid downstream of the cleaning fluid outlet. In this regard, the wide sidewalls can be oriented such that they are parallel to the direction of the pressure pulse generated by the compressed air cleaning device and proceeding parallel to the cleaning fluid outlet. With this orientation, multiple cleaning fluid outlets can be formed at the top of the filter element, following each other along the direction of the wide sidewalls, for example, in a configuration of multiple openings, each opening is separated from each other by a web connecting the wide sidewalls. The pressure pulse then enters the filter element through the individual cleaning fluid outlets or openings that follow each other in the direction of the pressure pulse's travel.

[0019] The filter element can be formed as a single piece.

[0020] The filtration device may further include at least one clean fluid collection channel, into which the clean fluid outlet of the filter element leads. In cases where the filter element has multiple clean fluid outlets and / or where multiple filter elements are arranged one after another, the multiple clean fluid outlets may be arranged one after another along the flow direction of the clean fluid exiting the filter element, all of which lead to the clean fluid collection channel. The clean fluid collection channel collects the clean fluid exiting the clean fluid outlets and further conveys the clean fluid. The clean fluid collection channel may extend at least substantially parallel (particularly parallel to) a first plane in its longitudinal orientation. The clean fluid collection channel may preferably be a hollow body extending from a first closed end to a second open end.

[0021] The cross-section of the clean fluid collection channel may increase in the direction of flow of the clean fluid exiting the clean fluid outlet, at least until no other clean fluid outlet leads into the clean fluid collection channel. Specifically, the clean fluid collection channel may increase steadily or uniformly from its upstream first end to its downstream second end. The term "steadily" is intended to express that the cross-section of the clean fluid collection channel increases continuously downstream. Alternatively, some stepwise increase in cross-section is conceivable, such as an increase in cross-sectional area at or after passing through another clean fluid outlet.

[0022] The cleaning fluid collection channel can have a square, roughly elliptical, or roughly circular cavity cross-section. These are shapes that are particularly favorable for the flow of cleaning fluid through the cleaning fluid collection channel.

[0023] The filtration device may have at least one, particularly two or more, filter elements, wherein the filter elements are arranged sequentially, i.e., in series, with respect to the flow direction of the clean fluid flowing away from the filter element downstream of the clean fluid outlet. In other words, the filter elements may be arranged sequentially from the first end to the second end of the clean fluid collection channel. Each filter element has its own at least one clean fluid outlet, which leads into the clean fluid collection channel. Filter elements may also each have multiple clean fluid outlets, as described above. In this case, the clean fluid outlets are arranged one after another in the flow direction of the clean fluid. If desired, some filter elements may also be arranged such that their clean fluid outlets lead to the clean fluid collection channel opposite to each other.

[0024] The compressed air cleaning device may include a compressed air supply channel configured to supply or apply a pressure pulse to a cleaning fluid collection channel. The cleaning fluid collection channel then transmits the pressure pulse generated by the compressed air cleaning device to a corresponding filter element, the filter element's cleaning fluid outlet of which opens into the cleaning fluid collection channel. It has been shown that the cleaning fluid collection channel, having the configuration described herein, is ideally suited for transmitting the pressure pulse against the flow of the pressure pulse during operation of the filter device. The compressed air supply channel may be coupled to the cleaning fluid collection channel at a location downstream of the end filter element, relative to the flow direction of the cleaning fluid flowing away from the filter element downstream of the cleaning fluid outlet.

[0025] The compressed air supply passage can be operatively coupled to or associated with the clean fluid collection passage outlet. At the clean fluid collection passage outlet, the clean fluid leaves the clean fluid collection passage and reaches downstream devices. For example, the clean fluid may pass through the clean fluid collection passage outlet into the clean fluid booster chamber (Reinfluidplenum), from which it is discharged and optionally supplied to downstream devices for processing the clean fluid.

[0026] The outlet end of the pressure pulse from the compressed air supply channel can be arranged opposite the outlet of the clean fluid collection channel, separated by an intermediate gap. In other words, the outlet end of the compressed air supply channel is approximately axially aligned with the extension direction of the clean fluid collection channel in the region adjacent to the outlet of the clean fluid collection channel. Therefore, the pressure pulse emitted from the compressed air collection channel enters the clean fluid collection channel directly.

[0027] Experiments have shown that the size of the gap between the outlet of the compressed air supply channel and the outlet of the clean fluid collection channel affects the cleaning efficiency of the filter element. Specifically, it has been found that it is advantageous if this gap is chosen to be large enough that the pressure pulse area is significantly increased as it travels between the outlet of the compressed air supply channel and the outlet of the clean fluid collection channel. In this way, the pressure pulse can be coupled into the clean fluid collection channel with a certain amplification effect. On the other hand, the distance between the outlet of the compressed air supply channel and the outlet of the clean fluid collection channel should be kept small enough that the pressure pulse area does not significantly exceed the cross-section of the outlet of the clean fluid collection channel when it enters the clean fluid collection channel. It is assumed that by appropriately determining the size of this gap, an effect similar to that of a horn or whistle can be achieved. The fluid stream located in this gap is excited by the pressure pulse. This excitation allows the relatively weak pressure pulse leaving the compressed air supply channel to be amplified sufficiently strongly on its way to the outlet of the clean fluid collection channel, thereby achieving a cleaning effect consistent with conventional compressed air cleaning devices.

[0028] Compressed air cleaning devices can be configured to introduce pressure pulses into the cleaning fluid collection channel in a manner that resists or opposes the flow direction of the cleaning fluid downstream of the cleaning fluid outlet.

[0029] The filtration device may have at least two clean fluid collection channels, each with at least one filter element disposed at the respective clean fluid collection channel, wherein the at least two clean fluid collection channels lead to a common clean fluid pressurization chamber. Such a device can filter a large volume of raw fluid. The clean fluid pressurization chamber may include a clean fluid pressurization chamber outlet for discharging clean fluid.

[0030] Each of at least two clean fluid collection channels may have a corresponding compressed air supply channel for its associated compressed air cleaning device. The corresponding compressed air supply channel may open into the clean fluid pressurization chamber relative to the outlet of the corresponding clean fluid collection channel of the associated clean fluid collection channel. Even if more than two clean fluid collection channels are provided, each clean fluid collection channel may have its own associated compressed air supply channel aligned with the outlet of the corresponding clean fluid collection channel.

[0031] Control elements, particularly controllable valves or controllable baffles that can be opened or closed, can be arranged at the compressed air supply passage to control or regulate the delivery of compressed air and thus control or regulate the pressure pulses entering the corresponding clean fluid collection passage.

[0032] The cleaning fluid collection channel may have at least one filter element container, into which the filter element can be slidably inserted. The filter element container may be designed such that the filter element can be slidably inserted from the cleaning fluid side, i.e., from the direction of the cleaning fluid collection channel. Alternatively, the filter element container may also be designed such that the filter element can be slidably inserted from the raw fluid side, i.e., from the perspective of the cleaning fluid collection channel, the cleaning fluid collection channel is applied to the cleaning fluid collection channel from the outside.

[0033] The filter element container may have an opening formed in the clean fluid collection channel, which is designed to mate with the filter element head of the filter element, such that the filter element head can be received and anchored therein. When the filter element is installed from the clean fluid side, the filter body of the filter element extends through the opening into the original fluid space. When the filter element is installed from the original fluid side, the filter element head is positioned on the opening, such that the clean fluid outlet of the filter element disposed in the filter element head mates with the opening to allow clean fluid to escape through the opening into the clean fluid collection channel.

[0034] The opening may include a frame that extends generally orthogonally away from the opening and surrounds it in a circumferential manner. The frame may have a cross-section corresponding to the filter element head, such that the filter element head can be slidably inserted into the frame.

[0035] Specifically, when at least one or more filter elements are installed from the cleaning fluid side, the cleaning fluid collection channel may have at least one mounting opening associated with the filter element container, through which the filter element can be inserted into and / or removed from the filter element container. This allows the filter element to be inserted into the cleaning fluid collection channel or replaced within a short period of time.

[0036] The mounting opening can be located in the wall opposite the filter element container to the clean fluid collection channel. The mounting opening can be closed via a baffle, door, removable cover, or slider.

[0037] The filtration device may include a housing surrounding at least a clean fluid collection channel and a filter element disposed therein, and mounting openings may be arranged within the housing of the filtration device. Specifically, the housing defines the original fluid space. In particular, the housing wall or a portion of the housing wall may form one of the boundaries of the clean fluid collection channel.

[0038] Clean fluid collection channels can include aluminum, and in particular, can be made with aluminum as the primary component. Alternatively, in some applications using stainless steel (VA) (such as V2A or V4A), the clean fluid collection channel can be made entirely or partially of steel sheet. It is also conceivable to make the clean fluid collection channel entirely or partially of plastic (such as PVC). Typically, the clean fluid collection channel is made of the same material as the filter housing.

[0039] In the method of the invention for cleaning the filter element of the filter device according to the invention, a pressure pulse is introduced through a cleaning fluid outlet arranged on the cleaning fluid side and extending in a first plane, against the flow direction of the cleaning fluid away from the filter element, such that when the pressure pulse passes through the cleaning fluid outlet, the pressure pulse undergoes a deflection of at least 60°, particularly at least about 90°.

[0040] The advantages and embodiments of the filtration device according to the invention also apply to the method, and will not be repeated for clarity.

[0041] The filtration device according to the invention is particularly useful in devices for extracting waste gases generated during additive manufacturing of workpieces from powdered metal raw materials; in devices for removing fumes generated during workpiece manufacturing by means of laser sintering processes; in devices for removing airborne impurities from laser welding systems or other welding fume systems; or in devices for removing impurities from fumes, particularly fumes generated during additive manufacturing or combustion processes; or in systems for cleaning paint residues during wet or powder coating application. Application of the filtration device according to the invention in filtering dust and other particulate contaminants in the food industry is also conceivable. Attached Figure Description

[0042] The invention will now be described in more detail with reference to exemplary embodiments schematically illustrated in the accompanying drawings, wherein:

[0043] Figure 1 A three-dimensional view shows the filtration device according to the invention and the blower connected downstream in the flow direction, wherein the housing of the filtration device is omitted.

[0044] Figure 2 It shows Figure 1 A cross-sectional view of a portion of the filtration device shown, the filtration device having several filter elements leading to a common clean fluid collection channel;

[0045] Figure 3 It shows Figure 2 An enlarged cross-sectional view of a portion of the filter device shown;

[0046] Figure 4 A three-dimensional view of a portion of another filtration device according to the invention is shown, the filtration device having eight filter elements leading to a common clean fluid collection channel;

[0047] Figure 5 It shows that only the arrangement is in Figure 4 A partial view of the filter element on the left side of the clean fluid collection channel, and a cross-sectional view of the clean fluid collection channel;

[0048] Figure 6 A further partial view of a filtration device according to the invention is shown, the filtration device having a plurality of clean fluid collection channels;

[0049] Figure 7 A three-dimensional view of a portion of another filtration device according to the invention is shown, the filtration device having twelve filter elements mounted on the clean fluid side, the twelve filter elements opening to a common clean fluid collection channel;

[0050] Figure 8 It shows that only the arrangement is in Figure 7 A partial view of the filter element at the lower end of the clean fluid collection channel; and

[0051] Figure 9 In local Figure 9 a) Local Figure 9 b) and local Figure 9 c) illustrates different spatial orientations of the filter element in the filtration device according to the invention, and further illustrates schematically how the filter element is installed on the raw fluid side or the clean fluid side. Detailed Implementation

[0052] In all the figures, the same reference numerals denote the same parts or parts with similar functions. Each of these parts is described in detail only with reference to the embodiment in which the corresponding reference numerals are used for the first time. It should be understood that the corresponding interpretations also apply to other embodiments in which the corresponding reference numerals are used. To avoid repetition, unless otherwise expressly stated, explicit references are made to the corresponding descriptions based on the first use of the corresponding reference numerals.

[0053] Figure 1A partial view shows components of an exemplary embodiment of a filter device 2 according to the invention for filtering fluid (in this case, air) loaded with foreign matter, arranged inside a filter housing (not shown). The filter device 1 is connected to an intake pipe 4 of a blower 6 for discharging exhaust gas. The blower 6 generates a negative pressure in the intake pipe 4, causing the original fluid loaded with particulate foreign matter (located in the original fluid space of the filter device 2) to be drawn out through the filter element 10 of the filter device 2. Thus, the filter device 2 filters the particulate foreign matter from the original fluid to obtain clean fluid exiting the filter device 2 via the intake pipe 4.

[0054] Figure 2 It shows Figure 1 The cross-sectional view of a portion of the filter device 2 shown has several filter elements 10 leading to a common clean fluid collection channel 12. Figure 2 The filter elements 10 of the filter device 2 shown are located in a common plane, which also includes a clean fluid collection channel 12 through which all filter elements 10 lead. Figure 2 As shown, all filter elements 10 and cleaning fluid collection channels 12 are located in a vertical plane, and the cleaning fluid collection channels 12 also extend vertically. Each filter element 10 has a box shape with two wide sidewalls 16 connected by two narrow sidewalls 18. The cross-section is a vertical plane passing through the center of the narrow side of the filter element 10. The filter elements 10 are arranged vertically on both sides of the cleaning fluid collection channel 12, one above the other, along their wide side direction. Filter element heads 20 are located at the end faces of the respective filter elements 10. A cleaning fluid outlet 22 is formed at this location. Bottom end walls 24 are formed at the longitudinally opposite bottom ends of the filter elements 10. Each filter element 10 leads into the cleaning fluid collection channel 12 via its cleaning fluid outlet 22, and the cleaning fluid outlets 22 of each of two filter elements 10 arranged at the same height are positioned opposite each other across the cleaning fluid collection channel 26. Figure 3 It shows Figure 2 An enlarged cross-sectional view of a portion of the filtration device.

[0055] In an exemplary embodiment, the filtration device 2 includes a plurality of filter elements 10 configured to filter raw fluid. Each filter element 10 leads to a clean fluid collection channel 12, wherein the clean fluid flowing out of the filter element 10 flows toward the clean fluid collection channel 12 (in... Figure 2 The fluid is guided vertically downwards until it flows through the clean fluid collection channel outlet 28 and into the clean fluid pressurization chamber 14. After the clean fluid has been collected in the clean fluid pressurization chamber 14, it is then pumped by the blower 6 (see...). Figure 1 It flows out of the filter device 2 through the suction pipe 4.

[0056] The filter device 2 includes a compressed air cleaning device 15, which generates pressure pulses for cleaning the filter surface of the filter element 10 and directs these pressure pulses to the cleaning fluid outlet 22 of the filter element 10 via the cleaning fluid collection channel 12. The pressure pulses then travel through the cleaning fluid outlet 22 to the corresponding associated filter element 10, acting on it by means of the cleaning pressure pulses. In the illustrated exemplary embodiment, the compressed air cleaning device 15 is configured to apply pressure pulses to the cleaning fluid pressurization chamber 14 immediately after these pressure pulses have been generated. The pressure pulses then travel through the cleaning fluid pressurization chamber 14 into the cleaning fluid collection channel 12 and to the cleaning fluid outlet 22 of the individual filter element 10. The compressed air cleaning device 15 operates according to the principle of back pressure. Here, pressure fluctuations or pressure pulses are generated by compressed air that is introduced into the filter device 2 against or against the flow direction of the cleaning fluid. The pressure pulses propagate through the cleaning fluid pressurization chamber 14, the cleaning fluid collection channel 12 to the filter element 10, and are transmitted to the filter element 10 through the cleaning fluid outlet opening. This ensures that foreign matter adhering to the filter element 10 is sprayed off the filter element 10 and falls onto the original fluid side of the filter element 10. In this way, the repeated cleaning during the operation of the filtration device ensures that the filter element 10 is cleaned from time to time and thus provides better filtration performance.

[0057] The filter element 10 is designed as a rigid body filter, having a flow-through porous filter body made of sintered material. The filter element 10 has a box-like shape, with two wide sidewalls 16 and two narrow sidewalls 18, although typically only one of the respective sidewalls is shown in the figures. The filter element 10 forms a clean fluid space within itself. Figure 3The image shows two filter elements 10 in cross-sectional view, each with a filter element head 20 arranged at a clean fluid collection channel 12, such that a respective clean fluid outlet 22 formed in the filter element head 20 leads into the clean fluid collection channel 12 and allows clean fluid to flow out of the respective filter element 10. The clean fluid outlet 22 can be subdivided into multiple partial clean fluid outlets, for example, by appropriately designing the filter element head 20 using multiple webs that interconnect two wide sidewalls 16. At the end of the filter element 10 opposite the clean fluid outlet 22, the filter element 10 includes a bottom end wall 24 terminating the filter element 10 on that side. The filter element head 20 and the bottom end wall 24 are connected to each other by sidewalls 16, 18. The wide sidewalls 16 and typically narrow sidewalls 18 are formed to be flow-through porous, i.e., porous to allow flow through them and provide a filtration surface for filtering the raw fluid. The bottom end wall 24 can also be formed to be flow-through porous to maximize the filtration area. Alternatively, the bottom end wall can also be formed to be impermeable to fluids. Furthermore, it is possible, as an alternative, that the wide side walls 16 are oriented relative to each other such that they are inclined toward each other from the filter element head 20 toward the opposite ends of the filter element 10 and abut each other at the opposite ends, making the bottom end wall 24 unnecessary in this alternative.

[0058] In the exemplary embodiment shown, the wide sidewalls 16 have a layered configuration and are formed in a serrated or wavy manner to increase the resulting filtration area. The resulting peaks and valleys essentially have routes extending in the longitudinal direction of the filter element 10. The peaks and valleys flatten in the direction of the filter element head 20, particularly in the filter element head 20, such that the cleaning fluid outlet 22 has a generally rectangular cross-section. This layered configuration is optional, making other configurations of the filter element conceivable.

[0059] exist Figure 1 In the exemplary embodiment shown, the filtration device 2 includes three parallel cleaning fluid collection channels 12 arranged side-by-side, each extending in a vertical direction. Six filter elements 10 are attached to each cleaning fluid collection channel 12. It should be understood that the filtration device 2 may include any number of cleaning fluid collection channels 12 and filter elements 10. The cleaning fluid collection channels 12 may be arranged in any other orientation relative to each other. Each cleaning fluid collection channel 12 extends substantially in a longitudinal direction. Figure 1In this context, the longitudinal direction is vertical; however, the longitudinal direction can be any other direction. The cleaning fluid outlet 22 of the filter element 10 is oriented substantially parallel to the longitudinal direction of the cleaning fluid collection channel 12, such that cleaning fluid flows from the cleaning fluid outlet 22 into the cleaning fluid collection channel 12 in a direction substantially orthogonal to the longitudinal direction of the cleaning fluid collection channel 12. The cleaning fluid is then deflected and flows through the cleaning fluid collection channel 12 in the longitudinal direction of the cleaning fluid collection channel 12.

[0060] The cleaning fluid collection channel 12, together with the cleaning fluid collection channel outlet 28, leads into the cleaning fluid pressurization chamber 14. At a first end 26 of the cleaning fluid collection channel 12, which is positioned opposite the cleaning fluid collection channel outlet 28, the cleaning fluid collection channel 12 is preferably closed by an end wall or by another closure. The cleaning fluid collection channel 12 is formed as a hollow body extending from the first end 26 to the cleaning fluid collection channel outlet 28. In an exemplary embodiment, the cleaning fluid collection channel 12 has a rectangular cavity cross-section with dimensions steadily increasing from the end 26 to the cleaning fluid collection channel outlet 28. It is also conceivable that the cleaning fluid collection channel 12 has an elliptical or circular cavity cross-section. The cleaning fluid collection channel outlet 28 forms a second end of the cleaning fluid collection channel 12.

[0061] Each filter element 10, arranged on the same side of the cleaning fluid collection channel 12, is arranged in series along the cleaning fluid collection channel 12 in the direction of cleaning fluid flow. In an exemplary embodiment, three filter elements 10 are arranged in a first sidewall 30 of the cleaning fluid collection channel 12, and three filter elements 10 are arranged in a second sidewall 32 of the cleaning fluid collection channel 12 opposite to the first sidewall 30. The sidewalls 30 and 32 extend in the longitudinal direction of the cleaning fluid collection channel 12. The filter elements 10 are arranged on the cleaning fluid collection channel 12 such that the two wide sidewalls 16 of the filter elements 10 are oriented parallel to the longitudinal direction of the cleaning fluid collection channel 12.

[0062] The clean fluid collection channel 12 opens at its clean fluid collection channel outlet 28 on the first side 34 of the clean fluid pressurization chamber 14. On the second side of the clean fluid pressurization chamber 14 opposite the first side 34, a compressed air supply channel 36 having a compressed air supply channel outlet 38 is arranged such that the compressed air supply channel outlet 38 is positioned opposite the clean fluid collection channel outlet 28, and pressure pulses from the compressed air supply channel outlet 38 travel to the clean fluid channel outlet 28. The compressed air supply channel 36 with the compressed air supply channel outlet 38 is oriented to introduce compressed air into the clean fluid collection channel 12 along its longitudinal direction. The compressed air supply channel 36 is arranged such that the compressed air supply channel outlet 38 is located downstream of the end filter element 10, relative to the flow direction of the clean fluid flowing away from the filter element downstream of the clean fluid outlet 22. The compressed air supply channel 36 is connected to a compressed air generator or compressed air accumulator (not shown) via a control element 40 (preferably a controllable valve that can be opened and closed). In an exemplary embodiment, a corresponding compressed air supply channel 36 is associated with each cleaning fluid collection channel 12.

[0063] Alternatively, the compressed air supply passage 36 may also be associated with multiple clean fluid collection passages 12. For example, in an exemplary embodiment (not shown), the compressed air supply passage 36 may branch at its end and terminate at two compressed air supply passage outlets 38, each of which leads to a clean fluid pressurization chamber 14 opposite to the clean fluid collection passage outlet 28. In an exemplary embodiment (not shown), it is also conceivable that the clean fluid pressurization chamber 14 is not arranged between the compressed air supply passage outlet 38 and the clean fluid collection passage outlet 28.

[0064] When cleaning of filter element 10 is to be performed, control element 40 is actuated manually or automatically. Compressed air is then introduced into cleaning fluid pressurization chamber 14 through compressed air supply passage 36 and through compressed air supply passage outlet 38, where the compressed air flow generates pressure pulses or pressure fluctuations. From there, the pressure pulses propagate through cleaning fluid collection passage outlet 28 into cleaning fluid collection passage 12. At cleaning fluid outlet 22 of filter element 10, the pressure pulses deflect at least 60°, specifically at least about 80°, specifically at least about 90°, and then reach the cleaning fluid space of filter element 10. The pressure pulses are transmitted to the walls 16, 18 of filter element 10, thereby ejecting foreign matter adhering to the original fluid side of the walls 16, 18 from the filter element 10, and cleaning of filter element 10 occurs.

[0065] The clean fluid booster chamber 14 forms a space that separates the clean fluid collection channel outlet 28 from the compressed air supply channel outlet 38. This has the advantage that the clean fluid contained within the clean fluid booster chamber 14 can be amplified by the pressure pulse emitted from the compressed air supply channel outlet 38. Amplification is achieved by the pressure pulse causing fluid oscillations within the clean fluid booster chamber 14. As the distance between the compressed air supply channel outlet 38 and the clean fluid channel outlet 28 increases, the cross-section of the pressure pulse increases, and therefore, the amount of fluid excited by the pressure pulse in the clean fluid booster chamber also increases. Therefore, when the fluid oscillations in the clean fluid booster chamber 14 excited by the pressure pulse are coupled to the clean fluid channel outlet 28, the pressure pulse can act on additional or even larger amounts of clean fluid in the clean fluid collection channel 12. This amplification allows the pressure pulse to achieve proper cleaning of the corresponding filter element 10 after it reaches and passes through the corresponding clean fluid outlet 22.

[0066] In an exemplary embodiment, the cleaning fluid collection channel 12 has a plurality of filter element containers 42 for receiving the filter element 10. Each filter element container 42 has an opening 44 through which cleaning fluid enters the cleaning fluid collection channel 12 from the filter element 10 via the cleaning fluid outlet 22. An annular flange 46 or edge is disposed around the opening 44 and extends out of the cleaning fluid collection channel 12 in a generally orthogonal direction. In embodiments not shown, the flange may also extend generally orthogonally into the cleaning fluid collection channel 12. The flange 46 forms a receiving space in which the filter element head 20 of the filter element 10 can be slidably inserted. The receiving space is laterally defined by an inner surface of the flange 46, which is adapted to seal against the outer surface of the filter element head 20, such that no original fluid or cleaning fluid can escape. In an exemplary embodiment, the outer surface of the filter element head 20 has a sealing element 48, thereby enabling a further improved sealing effect between the inner and outer surfaces. The cleaning fluid collection channel 12 is configured such that the filter element 10 is mounted and attached to the cleaning fluid collection channel 12 from the raw fluid side.

[0067] Figure 4 and Figure 5 A cleaning fluid collection channel 12 with eight filter elements 10 is shown, wherein four filter elements are arranged one after another on a first sidewall 30 of the cleaning fluid collection channel 12 in the longitudinal direction along the flow direction of the cleaning fluid, and wherein another four filter elements 10 are arranged one after another on a second sidewall 32 of the cleaning fluid collection channel 12 in the longitudinal direction along the flow direction of the cleaning fluid. The cleaning fluid collection channel 12 is configured such that the filter elements 10 are mounted and attached to the cleaning fluid collection channel 12 from the original fluid side.

[0068] Figure 6 An embodiment is shown having two clean fluid collection channels 12 that extend in the vertical direction and are arranged parallel to each other. Figure 6 The diagrams in the diagrams basically correspond to Figure 5 The illustration. In Figure 6 In the diagram, only a portion of the filter element 10 located on the right side of the center of the cleaning fluid collection channel 12 is shown. It should be understood that, in reality, the filter element 10 extends into the cleaning fluid collection channel 12 in a mirror image from both the left and right sides. As mentioned above, similarly in... Figure 6 In the accompanying drawings, the same reference numerals refer to the same or similar parts or features as in the foregoing embodiments. In the following descriptions, only... Figure 6 The embodiments shown herein differ from or have special features compared to other embodiments; for the remainder of the description, refer to the foregoing embodiments.

[0069] As in the foregoing embodiment, a plurality of filter elements 10 are arranged one after another in the longitudinal direction of the cleaning fluid collection channel 12, such that the filter elements 10 follow each other in their width direction. Furthermore, in Figure 6 In this embodiment, three or more filter elements 10 arranged side-by-side along its narrow side each lead to the same clean fluid collection channel 12. Therefore, in the illustrated embodiment, four pairs of filter elements 10 are arranged one above the other, with twelve filter elements leading to each clean fluid collection channel 12. The clean fluid outlet 22 of each filter element 10 leads to the corresponding clean fluid collection channel 12. Thus, in Figure 6 In the middle, twelve cleaning fluid outlets 22 each lead to a corresponding cleaning fluid collection channel 12. Each cleaning fluid collection channel 12 has a first closed end 26 ( Figure 6 (bottom of the middle) and forming a clean fluid collection channel outlet 28 ( Figure 6 The second end opposite to the top of the chamber. Clean fluid collection channel outlets 28, 28 lead to the common clean fluid pressurization chamber 14. A corresponding compressed air supply channel 36 with an associated compressed air channel outlet 38 is provided opposite to each clean fluid collection channel outlet 28 (for clarity, in...). Figure 6 In the diagram, only the right-hand cleaning fluid collection channel 12 is marked with a reference numeral. Pressure pulses can be coupled to the corresponding cleaning fluid collection channel 12 via the associated compressed air channel outlet 38, against the flow direction of the cleaning fluid, as described above. For this purpose, each compressed air supply channel 36 has a control device 40 by means of which the compressed air supply channel 36 can be opened or closed. The control device 40 is preferably a controllable valve or a controllable baffle.

[0070] Figure 7 A three-dimensional view of a portion of another embodiment of a filtration device according to the invention is shown, the filtration device having twelve filter elements 10 mounted on the clean fluid side, the filter elements 10 opening to a common clean fluid collection channel 12. Figure 8 The arrangement in Figure 7 A partial view of the filter element 10 at the lower end of the clean fluid collection channel 12.

[0071] Figure 7 Two cleaning fluid collection channels 12 are shown, into which twelve filter elements 10 are slidably inserted into corresponding filter element containers 42 on the cleaning fluid side (i.e., the side from which cleaning fluid flows in the cleaning fluid collection channel 12). Each filter element container 42 has an opening 44 formed in an associated wall of the cleaning fluid collection channel 12 through which the corresponding filter element 10 can be slidably inserted into the original fluid space 50 surrounding the filter housing 52 of the filter element 10. An annular flange 46 or edge is arranged around each opening 44, projecting generally orthogonally from the wall of the cleaning fluid collection channel 12 into the cleaning fluid collection channel 12. The flange 46 forms a receiving space into which the filter element head 20 of the filter element 10 can be slidably inserted. The receiving space is laterally defined by the inner surface of the flange 46, and the inner surface of the flange can sealably engage with the associated outer surface of the filter element head 20 so that no original fluid or cleaning fluid can escape. To improve sealing, the outer surface of the filter element head 20 in this embodiment includes a sealing element 48, such as a sealing ring. The cleaning fluid collection channel 12 is configured such that the filter element 10 is mounted and inserted into the cleaning fluid collection channel 12 from the cleaning fluid side. The cleaning fluid collection channel 12 is arranged adjacent to the filter housing 52 such that the sidewall of the cleaning fluid collection channel 12, which is arranged opposite to the filter element container 42, is formed by the housing wall 54. Figure 7As shown, the housing wall 54 is formed of a metal plate member in the region opposite the twelve filter element containers 42, and thus forms a door that can be opened or removed in one piece to insert the filter element 10 into the corresponding associated opening 44 of the filter element container 42 and to secure the filter element 10 and its filter element head 20 to the cleaning fluid collection channel 12. Alternatively or additionally, the housing wall 54 may include a mounting opening (not shown) for slidably inserting the filter element 10 into the opening 44 of the filter element container 42 through the mounting opening and securing the filter element 10 and its filter element head 20 to the cleaning fluid collection channel 12. The housing wall 54 may preferably be arranged such that the mounting opening formed therein is positioned opposite the filter element container 42. The mounting opening may be closed with a slide, baffle, or cap so that no cleaning fluid can escape from the cleaning fluid collection channel 12 during operation.

[0072] exist Figure 8 The text is incomplete and contains numerous errors. A more accurate translation would require the full context. Figure 7 The lower end of the cleaning fluid collection channel 12. Figure 8 In the diagram, two filter elements 10 are only partially inserted into the opening 44 of the filter element container 42 to illustrate the installation or removal of the filter elements 10 on the clean fluid side. In the inserted position, the filter element head 20 is then received in the receiving space of the filter element container 42 and sealably abuts against the corresponding flange 46.

[0073] Figure 9 With part Figure 9 a) Part Figure 9 b) and part Figure 9 c) Different spatial orientations of the filtration device 2 according to the invention are shown, and further, the installation of filter elements 10 with different spatial orientations on the raw fluid side and the clean fluid side of the clean fluid collection channel 12 is schematically illustrated. In these partial figures, the filter body of the filter element 10 protrudes into the raw fluid space 50.

[0074] Figure 9 a) A horizontally oriented clean fluid collection channel 12 is shown. Filter elements 10 are suspended in the clean fluid collection channel 12, with the left filter element 10 inserted into the clean fluid collection channel 12 on the raw fluid side and the right filter element 10 inserted into the clean fluid collection channel 12 on the clean fluid side. A compressed air supply channel outlet 38 is located on the right side of the clean fluid collection channel 12 and close to the clean fluid collection channel outlet 28, at which the clean fluid exits the clean fluid collection channel 12 during normal operation.

[0075] Figure 9(b) A vertically oriented clean fluid collection channel 12 is shown. Filter elements 10 are arranged orthogonally to the vertical orientation of the clean fluid collection channel 12, such that the longitudinal direction of the filter elements 10 extends horizontally. An upper filter element 10 is inserted into the clean fluid collection channel 12 on the raw fluid side, and a lower filter element 10 is inserted into the clean fluid collection channel 12 on the clean fluid side. A compressed air supply channel outlet 38 is arranged at the bottom opposite to the clean fluid collection channel outlet 28 of the clean fluid collection channel 12.

[0076] Figure 9 c) A vertically oriented clean fluid collection channel 12 is shown. Filter elements 10 are arranged orthogonally to the vertical orientation of the clean fluid collection channel 12. The lower filter element 10 is inserted into the clean fluid collection channel 12 on the raw fluid side, and the upper filter element 10 is inserted into the clean fluid collection channel 12 on the clean fluid side. A compressed air supply channel outlet 38 is located at the top opposite the clean fluid collection channel outlet 28 of the clean fluid collection channel 12.

[0077] The filtration device 2 further includes a filter housing 52 that encloses the filter element 10 and one or more clean fluid collection channels 12. The filter housing 52 has a raw fluid inlet 56 for supplying raw fluid into the raw fluid space 50 and to the filter element 10. Thus, the supplied raw fluid is then filtered through the filter element 10 and discharged as clean fluid from the filtration device 2 through a clean fluid outlet 58 in the filter housing 52.

[0078] exist Figures 1 to 5 In the figure, the cleaning fluid collection channel 12 is arranged such that the cleaning fluid collection channel outlet 28 points downwards. This is an exemplary installation and is not considered a limitation on the use of the filter device 2 according to the invention. Similarly, the cleaning fluid collection channel outlet 28 may point upwards, as shown... Figures 6 to 8 As shown, or pointing to the side.

[0079] The above embodiments should be understood as examples only. Specifically, in other embodiments, different numbers of filter elements, different numbers of clean fluid collection channels, different arrangements of filter elements on the clean fluid collection channels, different numbers of clean fluid pressurization chambers, and / or different numbers of compressed air supply channels can be used in the filtration device according to the present invention.

Claims

1. A filtration device (2), comprising: At least one filter element (10) is adapted to filter raw fluid and has a raw fluid side and a clean fluid side, the filter element (10) having a clean fluid outlet (22) disposed on the clean fluid side and extending in a first plane, through which the clean fluid is guided out of the filter element (10). as well as At least one compressed air cleaning device (15) is adapted to generate pressure pulses for cleaning foreign matter adhering to the filter element (10) and to direct the pressure pulses through the cleaning fluid outlet (22) to the filter element (10). The compressed air cleaning device (15) is adapted to guide the pressure pulse at least substantially along the first plane to the cleaning fluid outlet (22). The filter device (2) further includes at least one cleaning fluid collection channel (12), and the cleaning fluid outlet (22) leads to the at least one cleaning fluid collection channel (12); The filtration device (2) includes two or more filter elements (10), wherein the filter elements (10) are arranged sequentially relative to the flow direction of the clean fluid flowing away from the filter elements (10) downstream of the clean fluid outlet (22); The two or more filter elements (10) are arranged one after another along the clean fluid collection channel (12); The compressed air cleaning device (15) includes a compressed air supply channel (36) adapted to supply pressure pulses to the cleaning fluid collection channel (12); The compressed air supply passage (36) is located downstream of the end filter element (10), relative to the flow direction of the clean fluid flowing away from the filter element (10) downstream of the clean fluid outlet (22). The compressed air supply channel (36) is operatively coupled to the clean fluid collection channel outlet (28). The outlet end of the pressure pulse for the compressed air supply channel (36) is positioned relative to the outlet (28) of the clean fluid collection channel (12) across a gap; The compressed air cleaning device (15) is adapted to introduce the pressure pulse into the cleaning fluid collection channel (12) in the opposite direction to the flow direction of the cleaning fluid, relative to the flow direction of the cleaning fluid downstream of the cleaning fluid outlet (22).

2. The filtration device (2) according to claim 1. in, The filter element (10) forms a filter bag or filter cylinder formed by the filter surface, wherein the clean fluid outlet (22) is formed on the open side.

3. The filtration device (2) according to any one of the preceding claims. in, The at least one filter element (10) is formed as a rigid body filter.

4. The filter device (2) according to any one of the preceding claims. in, The at least one filter element (10) comprises a flow-through porous filter body made of sintered material, wherein the sintered material particularly comprises sintered plastic as a main component, especially sintered polyethylene particles or sintered polyphenylene sulfide particles as a main component.

5. The filtration device (2) according to any one of the preceding claims. in, The at least one filter element (10) has a box shape having two narrow sidewalls (18) and two wide sidewalls (16) extending from the clean fluid outlet to opposite ends.

6. The filtration device (2) according to claim 5. in, The opposite end is closed.

7. The filtration device (2) according to claim 5 or 6. in, The at least one filter element (10) is arranged such that the two wide sidewalls (16) extend parallel to the flow direction of the clean fluid downstream of the clean fluid outlet (22).

8. The filtration device (2) according to any one of claims 5 to 7. in, The wide sidewall (16) is oriented parallel to the direction of the pressure pulse traveling toward the clean fluid outlet (22).

9. The filtration device (2) according to any one of claims 1 to 8. in, The clean fluid collection channel (12) extends at least substantially parallel to the first plane.

10. The filtration device (2) according to any one of claims 1 to 9. in, The clean fluid collection channel (12) is a hollow body that extends from the closed end (26) to the open end.

11. The filtration device (2) according to any one of claims 1 to 10. in, The clean fluid collection channel (12) has a cross-section that increases along the flow direction of the clean fluid flowing away from the filter element (10) downstream of the clean fluid outlet (22), and in particular increases steadily from the upstream first end (26) to the downstream second end.

12. The filtration device (2) according to any one of claims 1 to 11. in, The clean fluid collection channel (12) has a square, generally elliptical or generally circular cavity cross-section.

13. The filtration device (2) according to any one of claims 1 to 12. It further includes at least two cleaning fluid collection channels (12), each cleaning fluid collection channel (12) having at least one filter element (10) associated with the cleaning fluid collection channel (12), wherein, The at least two clean fluid collection channels (12) lead to a common clean fluid pressurization chamber (14).

14. The filtration device (2) according to claim 13. in, Each of the at least two cleaning fluid collection channels (12) is associated with a corresponding compressed air supply channel (36) of the compressed air cleaning device (15).

15. The filtration device (2) according to claim 13 or 14. in, The corresponding compressed air supply channel (36) of the compressed air cleaning device (15) leads to the cleaning fluid pressurization chamber (14) via the compressed air supply channel outlet (38).

16. The filtration device (2) according to claim 15. in, The compressed air supply passage (36) and the associated clean fluid collection passage (12) outlet (28) open relative to each other into the clean fluid pressurization chamber (14).

17. The filtration device (2) according to any one of claims 1 to 16. in, The compressed air supply channel (36) has a control element (40) configured to control the supply of compressed air to the corresponding clean fluid collection channel (12).

18. The filtration device (2) according to any one of claims 1 to 17. in, The clean fluid collection channel (12) has at least one filter element container (42), and the filter element (10) can be slidably inserted into the at least one filter element container (42).

19. The filtration device (2) according to claim 18. in, The filter element container (42) has an opening formed in the cleaning fluid collection channel (12), the opening having a cross-section corresponding to the filter element head (20) of the filter element (10), such that the filter element head (20) can be slidably inserted into the opening.

20. The filtration device (2) according to any one of claims 1 to 19. in, The at least one cleaning fluid collection channel (12) has an installation opening associated with the filter element container (42), through which the filter element (10) can be inserted into and / or removed from the filter element container (42).

21. The filtration device (2) according to claim 20. in, The installation opening is arranged in the wall of the cleaning fluid collection channel (12) positioned opposite the filter element container (42).

22. The filtration device (2) according to any one of claims 1 to 21. in, The installation opening can be closed by a baffle, door, removable cover, or slider.

23. The filtration device (2) according to any one of claims 20 to 22. in, The filter device (2) includes a housing (52), and the mounting opening is arranged in the housing (52) of the filter device (2).

24. The filter device (2) according to any one of the preceding claims. in, The at least one filter element (10) is integrally formed.

25. The filtration device (2) according to any one of claims 1 to 24. in, Compressed air is introduced into a clean fluid booster chamber (14) through a compressed air supply channel (36) and through a compressed air supply channel outlet. In the clean fluid booster chamber (14), the compressed air flow generates a pressure pulse that causes fluid oscillations in the clean fluid booster chamber (14). The fluid oscillations in the clean fluid booster chamber (14) excited by the pressure pulse are coupled to the clean fluid channel outlet (28). The flow of clean fluid leaving the filter element (10) serves as the carrier fluid for the generated pressure pulse for cleaning. The pressure pulse moves against the flow direction of the clean fluid. The size of the gap between the outlet end of the compressed air supply channel (36) and the outlet (28) of the clean fluid collection channel is chosen to be so large that the pressure pulse increases its pressure pulse area during its travel between the outlet end of the compressed air supply channel (36) and the outlet (28) of the clean fluid collection channel.

26. The filtration device (2) according to claim 25. in, The size of the gap between the outlet end of the compressed air supply channel (36) and the outlet (28) of the clean fluid collection channel is chosen to be so large that the pressure pulse significantly increases its pressure pulse area as it travels between the outlet end of the compressed air supply channel (36) and the outlet (28) of the clean fluid collection channel, such that when the pressure pulse enters the clean fluid collection channel (12), the pressure pulse area of ​​the pressure pulsation corresponds to, but does not significantly exceed, the cross-section of the outlet (28) of the clean fluid collection channel.

27. A method for cleaning the filter element (10) of the filter device (2) according to any one of the preceding claims, comprising: At least one pressure pulse is introduced against the flow direction of the cleaning fluid leaving the filter element (10) through the cleaning fluid outlet (22) arranged on the cleaning fluid side and extending in the first plane, such that when the pressure pulse passes through the cleaning fluid outlet (22), the pressure pulse undergoes a deflection of at least 60°, particularly at least about 80°, particularly at least about 90°. The filter device (2) further includes at least one cleaning fluid collection channel (12), and the cleaning fluid outlet (22) leads to the at least one cleaning fluid collection channel (12); The filtration device (2) includes two or more filter elements (10), wherein the filter elements (10) are arranged sequentially relative to the flow direction of the clean fluid flowing away from the filter elements (10) downstream of the clean fluid outlet (22); The two or more filter elements (10) are arranged one after another along the clean fluid collection channel (12); The compressed air cleaning device (15) includes a compressed air supply channel (36) adapted to supply pressure pulses to the cleaning fluid collection channel (12); The compressed air supply passage (36) is located downstream of the end filter element (10), relative to the flow direction of the clean fluid flowing away from the filter element downstream of the clean fluid outlet (22). The compressed air supply channel (36) is operatively coupled to the clean fluid collection channel outlet (28). The outlet end of the pressure pulse for the compressed air supply channel (36) is positioned relative to the outlet (28) of the clean fluid collection channel (12) across a gap; The compressed air cleaning device (15) is adapted to introduce the pressure pulse into the cleaning fluid collection channel (12) in the opposite direction to the flow direction of the cleaning fluid, relative to the flow direction of the cleaning fluid downstream of the cleaning fluid outlet (22).

28. The method according to claim 27, in, Compressed air is introduced into a clean fluid booster chamber (14) through a compressed air supply channel (36) and through a compressed air supply channel outlet. In the clean fluid booster chamber (14), the compressed air flow generates a pressure pulse that causes fluid oscillations in the clean fluid booster chamber (14). The fluid oscillations in the clean fluid booster chamber (14) excited by the pressure pulse are coupled to the clean fluid channel outlet (28). The flow of clean fluid leaving the filter element (10) serves as the carrier fluid for the generated pressure pulse for cleaning. The pressure pulse moves against the flow direction of the clean fluid. The size of the gap between the outlet end of the compressed air supply channel (36) and the outlet (28) of the clean fluid collection channel is chosen to be so large that the pressure pulse increases its pressure pulse area during its travel between the outlet end of the compressed air supply channel (36) and the outlet (28) of the clean fluid collection channel.

29. The method according to claim 27 or 28, in, The size of the gap between the outlet end of the compressed air supply channel (36) and the outlet (28) of the clean fluid collection channel is chosen to be so large that the pressure pulse significantly increases its pressure pulse area as it travels between the outlet end of the compressed air supply channel (36) and the outlet (28) of the clean fluid collection channel, such that when the pressure pulse enters the clean fluid collection channel (12), the pressure pulse area of ​​the pressure pulsation corresponds to, but does not significantly exceed, the cross-section of the outlet (28) of the clean fluid collection channel.

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