Filter element and filter system

Abstract

The invention relates to a filter element (10) for filtering a fluid, having at least one filter corrugation (12), having a planar first inflow face (54) for a first fluid flow (60), and at least one second inflow face (56) for a second fluid flow (62) independent of the first fluid flow (60), wherein the second inflow face (56) is separate from the first inflow face (54). At least one compensation element (48) is arranged in a flow channel section (64) of the second fluid flow (62) on the original side. The invention also relates to a filter system (100) having such a replaceable filter element (10).

Description

Technical Field

[0001] The present invention relates to a filter element for filtering fluids, particularly a cartridge air filter for internal combustion engines or used as an interior space air filter, especially for motor vehicles, and a filter system having a filter element. Background Technology

[0002] In practice, particulate filters are used to filter out particulate contaminants contained in gaseous fluids, such as air. A particulate filter has a filter housing with an inlet for the fluid to be filtered and an outlet for the filtered fluid. The filter housing is structurally designed with an insertion opening for positioning the filter element in an insertion compartment within the filter housing. The filter element, arranged in the insertion compartment, can thus be flowed through by the fluid to be filtered, preferably from bottom to top, along the main flow axis during filter operation. Sealing devices for the filter element ensure a secure seal within the filter housing, preventing unwanted leakage or bypass flow of the gaseous fluid around the filter element during filter operation.

[0003] DE 10 2008 036 913 B3 describes an air filtration system with a flat-plate filter element. The air filtration system is constructed as compactly as possible while still incorporating measures to prevent the filter element from becoming clogged by snow and / or ice. This air filtration system includes a frame in which the plate-shaped filter element is housed. The filter element has a raw air side, a clean air side arranged substantially parallel to the raw air side, and narrow sides oriented substantially perpendicular to the raw air side. It also has a housing into which the frame, along with the filter element, is inserted. For the case where the filter element has a rectangular base, there are a total of four narrow sides: two longitudinally oriented narrow sides parallel to each other and two transversely oriented narrow sides, each perpendicular to the longitudinal narrow sides. A bypass valve is also provided, through which hot air, in an open state, reaches a region between the housing or frame and at least one narrow side, allowing hot air to flow from there through the narrow side into the filter element and out through the clean air side. Summary of the Invention

[0004] The objective of this invention is to provide an improved filter element for filtering fluids that prevents the filter element from being clogged by suspended particles from the fluid.

[0005] Another task is to propose a filtration system for filtering fluids that accommodates such a replaceable filter element.

[0006] The aforementioned task is solved according to one aspect of the invention by a filter element for a filtration system, the filter element having at least one filter corrugation, a planar first inlet surface for a first fluid flow, and at least one second inlet surface for a second fluid flow independent of the first fluid flow, wherein the second inlet surface is separate from the first inlet surface and wherein at least one compensation element is arranged on the original side in the flow channel section of the second fluid flow.

[0007] The advantageous design and benefits of the invention become apparent from the other claims, the description and the drawings.

[0008] A filter element for filtering fluid is proposed, having at least one filter corrugation, a planar first inlet surface for a first fluid flow, and at least one second inlet surface for a second fluid flow independent of the first fluid flow, wherein the second inlet surface is separate from the first inlet surface. At least one compensation element is arranged on the original side in the flow channel section of the second fluid flow.

[0009] The separation between the first and second inlet surfaces is advantageously configured to be liquid-tight, and in particular, to be at least sufficiently liquid-tight. Sufficient liquid-tightness here means that the separation is liquid-tight under normal operating conditions, such that the function of the filter element is practically unaffected. "Normal operating conditions" means that the inflow of fluid, and in particular the inflow of air, is at normal atmospheric pressure and is not blown in using overpressure. If the function of the filter element remains practically unaffected, i.e., leakage does not allow particles larger than the medium within the filter element to pass through, then the leakage is tolerable.

[0010] The filter corrugated element can be constructed integrally, such that the two inflow surfaces are formed in a single filter corrugated element made of a single filter medium. Alternatively, the two inflow surfaces can be realized in two different filter corrugated elements having the same or different filter media, and these two filter corrugated elements can be arranged in the filter element in a manner that connects them to each other.

[0011] Advantageously, a filtration system can be provided using a filter element that allows for advantageous variations with or without a particulate suspension valve. This eliminates the need for additional injection molding tools if injection molding is used in the production of the filtration system.

[0012] Advantageously, the compensating element can be configured to allow fluid to pass through. The fluid can pass through, while suspended particles in the fluid, such as snow, water, or the like, can be retained. This provides a larger filtration surface area for the original filtration task of the filter element, because the filter corrugated element is not clogged by suspended particles from the fluid.

[0013] The compensation element balances the tolerances in the filter element and, if necessary, can retain suspended particles from the second inlet surface on the original side of the filter element.

[0014] In a flat filter, the flow direction is perpendicular to, for example, the inlet and outlet surfaces. Preferably, in a filter with vertical pleats, the inlet and outlet surfaces are formed as follows, with the pleat ridges located in these surfaces.

[0015] In the filter element according to the invention, the filter element may, for example, be configured as a plastic-enclosed injection-molded filter element (KUF element) with an additional filter area having a second inlet surface outside the main filter area having a first inlet surface of the filter corrugations. This additional filter area serves to connect to another suction portion of fluid, such as air. The connection of the other suction portion can be achieved at the end side and / or via an edge segment of a separated region on the plastic-enclosed injection-molded filter element having a portion deflected by a second fluid flow. In this case, the edge segment is a surface element in the filter corrugations near or adjacent to the periphery of the filter corrugations. For example, the first and second inlet surfaces may be parallel to each other.

[0016] Additional filter zones separated from the KUF element can be located on the edge of the filter element or within the filter element. Multiple additional filter zones with different inlet surfaces can also be provided. These filter zones can be constructed for the same or different connection directions.

[0017] This implementation of the filter element has significant advantages over existing technologies, such as snow valve solutions using paper filter elements, where a nonwoven fabric can be placed on the filter element on the raw air side, directly sealing other inflow channels. The filter element according to the invention has a separate inflow surface. This separate inflow surface can be independently provided with a compensating element, particularly a compensating element that can be flowed through by fluid. The filter medium of the compensating element can be, for example, a nonwoven fabric. A separate second fluid flow can be supplied via a second inflow surface of other filtration areas, which can also be, for example, preheated. In this way, different fluid flows can be filtered using a plastic-enclosed injection-molded filter element. The filter corrugations can be, for example, zigzag-folded filter corrugations made of nonwoven fabric.

[0018] The separate additional filtration areas of the filter element for the second inlet surface can be configured as cavities separate from the first fluid flow. Separation elements can be provided for this purpose. The walls of the cavities can effectively prevent overflow into the main filtration area having the first inlet surface. The cavities can be separated in the graded pleated areas of the original filter corrugated element by ribs acting as separation elements.

[0019] If necessary, it is advantageous to use at least two different filter corrugations with different filter media for the two inflow surfaces, such that each filter corrugation has an inflow surface, and these inflow surfaces are then separated from each other by a separation element. This achieves, for example, that the filter corrugation of the first inflow surface is constructed as a pleated filter and the filter corrugation of the second inflow surface is constructed as a nonwoven fabric layer. The pleated filter has a significantly larger filtration surface than the nonwoven fabric layer, thereby taking into account the functional division into a main filtration area for normal operation and normal flow when the first inflow area can pass freely, and a secondary filtration area for emergency flow when the first inflow area is blocked.

[0020] The second inflow can utilize heated air. If the first inflow is clogged with suspended particles in the fluid, such as snow, the filter element can operate via the second inflow in an emergency. In this way, the compensating element can perform additional filtration.

[0021] A preferred flow-through compensating element, constructed of nonwoven fabric but also, for example, an elastomer, is used for tolerance balancing during filter element installation due to its elasticity. The compensating element can be fastened to the original filter corrugation or the frame of the filter corrugation, for example, via adhesive beads.

[0022] The filter element can advantageously be configured as a drawer-type filter element for lateral insertion into the filter housing. Alternatively, the filter element can be inserted into the open filter housing from above, and the filter housing can then be closed using a housing cover.

[0023] The compensation element can also be injection molded together with the surrounding injection molding of the filter corrugation to form a frame, in order to achieve tolerance balance and / or also to achieve effective coverage of the second inlet surface.

[0024] According to an advantageous design, at least one separating element can be arranged in the filter corrugated element between the first and second inlet surfaces. In this way, the first fluid flow that should only reach the first inlet surface can be effectively prevented from reaching the second inlet surface, which could then be blocked by suspended particles from the fluid. The fluid flow to the second inlet surface can then preferably flow through the portion of the filter corrugated element that is not blocked, for example, by snow.

[0025] According to an advantageous design, the compensation element can be arranged in or on the edge segment of the filter element. Thus, the connection of other suction sections can be achieved via the edge segment of the injection-molded filter element, which has a separated area with a second fluid flow deflection, and thereby can be advantageously positioned in terms of structural space.

[0026] According to an advantageous design, the compensation element can be arranged in or on the end face of the filter element. Thus, the connection of other suction sections can be achieved via the end face of the injection-molded filter element, which has a separated region with a second fluid flow deflection, and can thereby be advantageously positioned in terms of structural space.

[0027] According to an advantageous design, the separating element can be connected to a cover element to planarly cover the second inlet surface relative to the first fluid flow, preferably at least sufficiently liquid-tight under normal operating conditions. Here, the separating element, cover element, compensating element, and / or frame can be configured as a cavity. The cover element can be formed, for example, from plastic. Separate additional filtration areas of the filter element for the second inlet surface can be configured as cavities separate from the first fluid flow. In an alternative design, no separate cover element is provided, wherein the separating element, compensating element, and / or frame can form a cavity. The walls of the cavity can effectively prevent overflow toward the main filtration area having the first inlet surface. The cavity can be separated, for example, by ribs, within the graded pleated areas of the original filter corrugated element.

[0028] According to an advantageous design, at least one filter bellows can be zigzag-folded into pleats, having parallel pleat ridges that follow each other in the longitudinal extension of the filter bellows, these pleat ridges extending between opposite end ridges of the filter bellows. Here, at least one filter bellows can be injection-molded around a continuous frame. If two different filter bellows for two inflow zones are arranged in the filter element, these two filter bellows can also be injection-molded together around a continuous frame. Such a filter element is advantageously used as, for example, an air filter for an internal combustion engine and demonstrates a cost-effective and efficient solution for air filters. The filter element can be easily installed via the injection-molded frame and can be replaced when needed.

[0029] According to an advantageous design, the separating element can be arranged parallel to the pleats of the filter corrugations. This parallel arrangement of the separating element to the pleats presents a fluid-technically advantageous solution. Alternatively, the separating element can also be arranged at an angle relative to the pleats.

[0030] According to an advantageous design, the compensating element can be connected to the filter corrugations and / or frame. In this way, effective coverage of the second inlet surface can be achieved via the compensating element, forcing the second fluid flow through it. The compensating element will also not be accidentally detached during installation.

[0031] According to an advantageous design, the compensating element can be formed from nonwoven fabric. Nonwoven fabric presents a low-cost and easy-to-install solution for the compensating element. The elasticity of the compensating element allows for advantageous tolerance balancing during the installation of the filter element. If the compensating element is constructed to allow flow through, it can also cause fluid filtration. Another advantageous alternative demonstrates an elastomer as the compensating element, whose elasticity allows for advantageous tolerance balancing during the installation of the filter element.

[0032] According to an advantageous design, the filter bellows can have an inlet side and an opposite outlet side, which are spaced at different distances from each other relative to the first inlet surface in the regions of other filtration areas with a second inlet surface, and in particular, at smaller distances. By varying the thickness of the main filtration area in the region of the first inlet surface and the other filtration areas in the region of the second inlet surface, the second fluid flow can be advantageously guided to the second inlet surface via the cavity as a fluid passage segment. It is also structurally advantageous to place a valve, for example, a check valve, in the region of the filter bellows, thereby advantageously reducing structural space requirements.

[0033] According to an advantageous design, the frame with filter corrugations can be configured as a drawer-type filter element. The drawer-type filter element presents a convenient installation solution for integrating filter elements into a filtration system, and the filter element can be easily replaced during maintenance. The drawer-type filter element can be introduced into the filter housing laterally in the flow direction. Alternatively, it is also possible to insert the filter element from above into the lower part of the housing, which can then be closed using a housing cover.

[0034] According to another aspect, the present invention relates to a filtration system for filtering fluids, having a filter housing and filter elements for filtering fluids interchangeably arranged in the filter housing between a raw side and a clean side, having at least one filter corrugation, having a planar first inlet surface for a first fluid flow, and at least one second inlet surface for a second fluid flow, wherein the second inlet surface is sufficiently liquid-tightly separated from the first inlet surface. At least one compensation element is arranged on the raw side, and the flow path of the second fluid flow is guided from the inlet on the raw side through the compensation element to the second inlet surface. The filter housing has a first inlet for allowing the first fluid to flow onto the first inlet surface and at least one second inlet for allowing the second fluid flow onto at least one second inlet surface.

[0035] In the filter element of the filtration system according to the invention, the filter element may, for example, be configured as a plastic-enclosed injection-molded filter element (KUF element) with an additional filter area having a second inlet surface outside the main filter area having a first inlet surface with filter corrugations. This additional filter area is used to connect to an additional suction portion for fluid, such as air. The connection of the additional suction portion may be achieved at the end side and / or via an edge segment of a separated region on the plastic-enclosed injection-molded filter element having a portion deflected by a second fluid flow.

[0036] The filter corrugated element can be constructed integrally, such that the two inflow surfaces are formed in a single filter corrugated element made of a single filter medium. Alternatively, the two inflow surfaces can be realized in two different filter corrugated elements having the same or different filter media, and these two filter corrugated elements can be arranged in the filter element in a manner that connects them to each other.

[0037] Other filter zones separated from the KUF element can be located on the edge of the filter element or inside the filter element. Multiple filter zones can also be constructed for different connection directions.

[0038] This implementation of the filter element offers significant advantages over existing technologies, such as snow valve solutions using paper filter elements, where a nonwoven fabric can be placed on the filter element on the raw air side, directly sealing other inflow channels. The filter element according to the invention has an independent inflow surface, which can be independently equipped with a compensation element, such as a nonwoven fabric, elastomer, or the like, through which an independent second fluid flow can be supplied. This second fluid flow can also be preheated, for example. In this way, different fluid flows can be filtered using a plastic-enclosed injection-molded filter element. For example, a zigzag-folded filter corrugated element made of nonwoven fabric can be used as the filter corrugation.

[0039] According to an advantageous design, the flow channel can be guided from the inlet on the original side to the second inlet surface via at least a portion of the end face of the filter element. Thus, the connection of other suction sections can be achieved via the end face of the injection-molded filter element, which has or does not have a portion deflected by the second fluid flow, and thereby can be advantageously arranged in terms of structural space.

[0040] According to an advantageous design, the flow channel can be guided from the inlet on the original side through at least a portion of the edge segment of the filter element to the second inlet surface. Thus, the connection of other suction sections can be achieved via the edge segment of the injection-molded filter element, which has a separated region with a portion deflecting the second fluid flow, and thereby can be advantageously arranged in terms of structural space.

[0041] According to an advantageous design, the separating element, cover element, compensating element, and / or frame can be configured as a cavity. Separate additional filtration areas of the filter element for the second inlet surface can be configured as cavities separate from the first fluid flow. In an alternative design, a separate cover element is not provided, wherein the separating element, compensating element, and / or frame can form a cavity. The walls of the cavity thus effectively prevent overflow toward the main filtration area having the first inlet surface. The cavity can be separated by ribs within the graded pleated areas of the original filter corrugated element.

[0042] According to an advantageous design, a flow cavity can be constructed in the housing component, such as the lower housing component, for the second fluid flow, the flow cavity having a valve, for example, implemented as a check valve. In this way, the inflow of the first fluid through the second inlet surface can be effectively prevented during normal operation, and the fluid will only flow through the second inlet surface when the first inlet surface is blocked. Thus, reliable functioning of the filtration system can be achieved during normal operation by utilizing the most effective filtration possible in the region of the first inlet surface.

[0043] According to an advantageous design, a valve can be arranged at the second inlet. For structural space engineering reasons, the valve can be advantageously combined with the second inlet, thereby demonstrating a filtration system that is as compact as possible. Furthermore, this allows for reliable functioning of the filtration system during normal operation by utilizing the most efficient filtration possible in the area of ​​the first inlet surface.

[0044] According to an advantageous design, the inflow of fluid through the valve can be configured to be pressure-controlled or controlled by flow resistance. This advantageously ensures that the second fluid flow only enters the flow channel of the second inlet surface in the event of blockage of the first inlet surface, thus creating a corresponding negative pressure in the filtration system. The area of ​​the second inlet surface in the filter element is only needed for emergency operation, while during normal operation, the first fluid flow only passes through the first inlet surface.

[0045] According to an advantageous design, the filter element can be configured as a drawer-type filter element, which is introduced or can be introduced into the filter housing transverse to the main flow axis of the fluid. Advantageously, the filter bellows can be configured as flat filter bellows. The bellows of a flat filter exhibit an advantageous structural form for air filters and can be advantageously used as a drawer-type filter, thereby providing an advantageous structural space ratio.

[0046] According to an advantageous design, the filter housing may have an insertion compartment with a frame guide for the filter element, by means of which the filter element can be inserted into the insertion compartment through the insertion opening of the filter housing, such that the seal of the filter element is circumferentially and sealingly abutting against the sealing surface of the housing. Drawer-type filter elements demonstrate an easy-to-install solution for integrating filter elements into a filtration system, and the filter element can be easily replaced during maintenance. Alternatively, it is also feasible to insert the filter element, for example, from above into a lower housing component of the filter housing, which can then be closed using a housing cover.

[0047] The described filtration system can be advantageously used as an air filter, especially as an air filter for an internal combustion engine or as an air filter for the interior space of a motor vehicle. Attached Figure Description

[0048] Other advantages will become apparent from the following description of the accompanying drawings, which illustrate embodiments of the invention. The drawings, description, and claims contain numerous combinations of features. Those skilled in the art will also suitably consider these features individually and arrive at other reasonable combinations.

[0049] For example:

[0050] Figure 1 A cross-sectional isometric view of a filtration system having an installed drawer-type filter element according to an embodiment of the invention is shown, with inflow through the edge segment of the filter element;

[0051] Figure 2 The region shown is in accordance with the second inflow surface. Figure 1 A detailed view of the filtration system;

[0052] Figure 3 It shows according to Figure 1 Isometric view of the components under the housing of the filtration system;

[0053] Figure 4 Showing from according to Figure 1 An isometric diagram of the filter elements of the filtration system;

[0054] Figure 5 Showing from according to Figure 1 Isometric cross-sectional view of the filter element of the filtration system;

[0055] Figure 6 A cross-sectional isometric view of a filtration system having an installed drawer-type filter element according to an embodiment of the invention is shown, with inflow through the end face of the filter element.

[0056] Figure 7The region shown is in accordance with the second inflow surface. Figure 6 A detailed view of the filtration system;

[0057] Figure 8 It shows according to Figure 6 Isometric view of the components under the housing of the filtration system;

[0058] Figure 9 Showing from according to Figure 6 An isometric diagram of the filter elements of the filtration system; and

[0059] Figure 10 Showing from according to Figure 6 Isometric cross-sectional view of the filter element of the filtration system. Detailed Implementation

[0060] The same or similar parts in the accompanying drawings are labeled with the same reference numerals. The accompanying drawings are merely examples and should not be construed as limiting.

[0061] Figure 1 A cross-sectional isometric view of a filtration system 100 with an installed drawer-type filter element 10 according to an embodiment of the invention is shown, showing inflow through the edge segment 30 of the filter element 10, while Figure 2 The diagram shows the region of the second inflow surface 56 according to Figure 1 A detailed view of the filtration system 100. The edge segment 30 can be circulated not only along the flow direction 58, but also inclined to the flow direction.

[0062] The filtration system 100 has a filter housing 110 with a housing lower component 114 and a housing cover 112, and a filter element 10 for filtering fluids, which is interchangeably arranged in the filter housing 110 between a raw side 50 and a clean side 52. The filter element 10 includes, for example, an integral filter bellows 12 having a planar first inlet surface 54 for a first fluid flow 60 and a second inlet surface 56 for a second fluid flow 62 independent of the first fluid flow 60. The fluid flows 60 and 62 are indicated by arrows. The first fluid flow 60 enters the raw side 50 of the filter housing 110 through the inlet 102 of the housing lower component 114 and then flows through the first inlet surface 54 and the filter bellows 12 to the clean side 52. The second fluid flow 62 enters the fluid chamber 132 via a valve 116 (see...). Figure 3The fluids 60 and 62 enter the lower component 114 of the housing and pass through the filter corrugated element 12 via the second inlet surface 56, along the flow channel 130 and flow channel section 64. The two fluid flows 60 and 62 exit from the filter housing 110 through the outlet 104. The second inlet surface 56 and the first inlet surface 54 are sufficiently liquid-tightly separated by the separation element 44. Here, the compensation element 48 is arranged on the original side before the second inlet surface 56, and the flow channel 130 of the second fluid flow 62 is guided from the inlet 106 on the original side to the second inlet surface 56 through the compensation element. Here, the compensation element 48 is arranged on the edge section 30 of the filter element 10 upstream of the second inlet surface 56 in the flow channel section 64 of the second fluid flow 62. In this way, the flow channel 130 is guided from the inlet 106 on the original side to the second inlet surface 56 through at least a portion of the edge section 30.

[0063] The filter housing 110 has a first inlet 102 for allowing a first fluid 60 to flow onto a first inlet surface 54 and a second inlet 106 for allowing a second fluid flow 62 to flow onto a second inlet surface 56.

[0064] The separating element 44 is arranged parallel to the pleats 34 of the filter corrugation 12, thereby generating as little flow resistance as possible through the separating element 44 itself. The separating element 44 is liquid-tightly connected to the cover element 46 to planarly cover the second inlet surface 56 relative to the first fluid flow 60. Thus, the separating element 44, the cover element 46, the compensating element 48, and the frame 28 can be configured into a cavity. The compensating element 48 then terminates directly at the end wall of the opening 118 when the filter element 10 is installed.

[0065] The compensating element 48, which can be constructed as a nonwoven fabric, is connected to the filter corrugated element 12 and the frame 28. Due to its elasticity, the compensating element 48 serves as a tolerance balance when the filter element 10 is installed in the filter housing 110. The compensating element 48 also provides a sealing function relative to the flow channel 130.

[0066] The filter corrugated element 12 has an inlet side 66 and an opposite outlet side 68, which are closer to each other in the region of the second inlet surface 56 than to the first inlet surface 54. This means that the filter corrugated element is constructed to be thinner in the region of the second inlet surface 56.

[0067] In this example, the filter element 10 with the filter corrugations 12 is configured as a flat filter in the form of a drawer-type filter element. Furthermore, the filter housing 110 has an insertion compartment 146 with a frame guide 158 for the filter element 10. By means of the frame guide, the filter element 10 can be inserted into the insertion compartment 146 transversely to the flow direction 58 via the insertion opening 144 of the filter housing 110, such that the seal 40 of the filter element 10 is circumferentially and sealingly abuts against the housing sealing surface 160 in the axial direction with respect to the main flow axis 128 of the fluid. The flow direction 58 is parallel to the main flow axis 128. The flow direction 58 is, for example, perpendicular to the inlet surfaces 54, 56 and the outlet side 68, or the outlet surface. Preferably, the outlet and inlet surfaces are formed in the filter corrugations 12 with the raised pleats 34 as follows: the pleat ridges 26 on the inlet and outlet sides (… Figure 2 ) are located in these faces respectively.

[0068] Alternatively, other geometries of the filter element 10 can be provided instead of a flat filter, such as a tiered filter element.

[0069] A flow chamber 132 is constructed in the lower housing component 114 of the filter housing 110, which has a valve 116 for a second fluid flow 62. The valve 116 is arranged on the second inlet 106 and can be configured, for example, as a check valve. The inflow of fluid via the valve 116 can be controlled by pressure or by flow resistance. However, the valve 116 is not essential for the function of the second inlet surface 56 as a separate filtration area for emergency operation in case of blockage at the first inlet surface 54.

[0070] Figure 3 It shows according to Figure 1 An isometric view of the lower housing component 114 of the filtration system 100. The lower housing component 114 includes an inlet 102 for fluid into the filter housing and has a flow chamber 132, which shows a flow channel section 64 through which a second fluid flows 62 (see [reference]). Figure 1 and 2 It can reach the flow channel 130 through the inlet opening 118 and thus reach the second inlet surface 56 of the filter element 10 through the compensation element 48.

[0071] Figure 4 As can be seen from according to Figure 1 An isometric view of the filter element 10 of the filtration system 100, and Figure 5A cross-sectional isometric view of filter element 10 is shown. Filter element 10 is implemented as a flat filter in the form of a drawer-type filter element and has a closing element 42 at one end outside the plastic-enclosed injection-molded filter corrugated element 12, which closes the insertion opening 144 in the filter housing 110. The seal between the raw side 50 and the clean side 52 of the filtration system is achieved by a seal 40 arranged on the frame 28, which, in the installed state, seals against the housing sealing surface 160. Figure 2 )superior.

[0072] The filter element 10 has a filter corrugated member 12 zigzag-folded into pleats 34, having pleat ridges 26 that follow each other on the longitudinal extension 14 between the opposing end ridges 22, 23 of the filter corrugated member 12, respectively constructed on the inlet and outlet sides. The filter corrugated member 12 is injection-molded and surrounded by a continuous frame 28 made of plastic.

[0073] Figure 6 A cross-sectional isometric view of a filtration system 100 with an installed drawer-type filter element 10 according to an embodiment of the invention is shown, showing inflow through the end face 24 of the filter element 10, while Figure 7 A detailed view of the filtration system 100 in the region of the second inlet surface 56 is shown. Here, the compensating element 48 is arranged at a slight angle with respect to the inlet side 66 on the end face 24 of the filter element 10. Thus, the flow passage 130 guides the flow from the inlet 106 on the original side through at least a portion of the filter element end face 24 to the second inlet surface 56. Fluid flows 60 and 62 are again indicated by arrows. The first fluid flow 60 enters the original side 50 of the filter housing 110 through the inlet 102 of the housing lower component 114 and then flows through the first inlet surface 54 and the filter bellows 12 to the clean side 52. The second fluid flow 62 enters the fluid chamber 132 via the valve 116 (see...). Figure 8 The fluids enter the lower housing component 114 and pass through the compensation element 48 along the flow channel 130 and flow channel section 64, then through the second inlet surface 56 and the filter corrugated element 12. The two fluid flows 60 and 62 exit from the filter housing 110 through the outlet 104.

[0074] The implementation of filter element 10 is similar to Figures 1 to 5 The embodiment shown has a separating element 44 parallel to the pleats 34 of the filter corrugation 12, which separates the first inflow region 54 from the second inflow region 56. However... Figures 6 to 10In the embodiment shown, the inflow to the second inflow surface 56 occurs directly from the bottom surface of the filter corrugated element 12. Therefore, the filter element 10 does not have a cover element in this embodiment. The compensation element 48 is arranged between the opening 118 on one side of the housing lower component 114 and the separation element 44 and frame 28 on the opposite side. The compensation element 48 is then directly connected to the opening 118 of the filter housing lower component 114 after the filter element 10 is installed. Figure 8 Valve 116 is used for inflow into the second flow channel 130.

[0075] Figure 8 It shows according to Figure 6 An isometric view of the lower housing component 114 of the filtration system 100. In this embodiment, the lower housing component 114 is... Figures 1 to 5 The difference in this embodiment is that the inlet opening 118 of the flow cavity 132 points upward and the flow channel section 64 is directly constructed in the flow cavity 132, because the filter element 10 is connected via its second inlet surface 56, such as Figure 6 and 7 As can be seen, the flow enters directly from below.

[0076] Figure 9 As can be seen from according to Figure 6 An isometric view of the filter element 10 of the filtration system 100, and Figure 10 A cross-sectional isometric view of the filter element 10 is shown. The inclined arrangement of the compensation element 48 between the separating element 44 and the frame is clearly visible. The compensation element is connected to the separating element 44 and the frame 28 and is, for example, adhesive.

Claims

1. Filter element (10) for filtering a fluid, having at least one filter corrugation (12) with a planar first inflow face (54) for a first fluid flow (60) and at least one second inflow face (56) for a second fluid flow (62) independent of the first fluid flow (60), and having a frame (28), characterized in that A separating element (44) is arranged in the filter corrugate (12) between the first and the second inflow face (54, 56) such that the second inflow face (56) is separated from the first inflow face (54), wherein at least one compensation element (48) for balancing tolerances in the filter element is arranged in the flow channel section (64) of the second fluid flow (62) before the second inflow face (56) on the original side, and wherein at least the separating element (44), the compensation element (48) and / or the frame (28) are configured as a chamber.

2. The filter element of claim 1, wherein, The compensation element (48) is arranged in or on an edge section (30) of the filter element.

3. The filter element of claim 1, wherein, The compensation element (48) is arranged in or on an end face (24) of the filter element.

4. The filter element of any one of claims 1 to 3, wherein, The separating element (44) is connected to a cover element (46) in a liquid-tight manner for planarly covering the second inflow face (56) with respect to the first fluid flow (60).

5. The filter element according to any of the preceding claims 1 to 3, characterized in that The at least one filter corrugate (12) is folded in a zigzag into a pleat (34) having pleat edges (26) following one another parallel in the longitudinal extension (14) between opposite end edges (22, 23) of the filter corrugate (12), and wherein the at least one filter corrugate (12) is surrounded by injection molding with a continuous frame (28).

6. The filter element according to any of the preceding claims 1 to 3, characterized in that The compensation element (48) is connected to the filter corrugate (12) and / or the frame (28).

7. A filter system (100) for filtering a fluid, having a filter housing (110) and a filter element (10) for filtering a fluid, which is arranged exchangeably in the filter housing (110) between a raw side (50) and a clean side (52), the filter element having at least one filter corrugation (12), having a planar first inflow face (54) for a first fluid flow (60) and at least one second inflow face (56) for a second fluid flow (62) independent of the first fluid flow (60), characterized in that The second inflow face (56) is separated from the first inflow face (54), wherein at least one compensation element (48) for balancing tolerances in the filter element is arranged before the second inflow face (56) on the original side, the flow channel (130) of the second fluid flow (62) being guided from a second inlet (106) on the original side through the compensation element to the second inflow face (56), wherein the filter housing (110) has a first inlet (102) for the first fluid flow (60) to flow onto the first inflow face (54) and at least one second inlet (106) for the second fluid flow (62) to flow onto the at least one second inflow face (56).

8. The filtration system of claim 7, wherein, The flow channel (130) is guided from a second inlet (106) on the original side via at least one portion of a filter element end face (24) to the second inflow face (56), and / or wherein the flow channel (130) is guided from a second inlet (106) on the original side through at least one portion of an edge section (30) of the filter element (10) to the second inflow face (56).

9. The filtration system of claim 7 or 8, wherein, A flow chamber (132) is configured in the housing lower part (114), the flow chamber having a valve (116) for the second fluid flow (62).

10. The filtration system of claim 7 or 8, wherein, A valve (116) is arranged on the second inlet (106).

11. The filtration system of claim 7 or 8, wherein, The filter housing (110) has an insertion compartment (146) with a frame guide (158) for the filter element (10) by means of which the filter element (10) can be inserted into the insertion compartment (146) via an insertion opening (144) of the filter housing (110) such that a seal (40) of the filter element (10) abuts sealingly on a housing sealing surface (160) in an axial direction with respect to a main flow axis (128) of the fluid.

12. The filtration system of claim 7, wherein, The filter element is configured according to any one of claims 1 to 6.

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