Filter element and filter system

Abstract

The invention relates to a filter element (10) for filtering a fluid, having at least one filter bellows (12) which is arranged in a frame (28) and which has a flat first inflow face (54) for a first fluid flow (60) and at least one second inflow face (56) for a second fluid flow (62) which is separate from the first fluid flow (60), wherein the second inflow face (56) is spaced apart from the first inflow face (54), and wherein a flow channel section (132) of a flow channel (130) which is provided for guiding the second fluid flow (62) is arranged in such a way that it is inside the frame (28). Furthermore, the invention also relates to a filter system (100) having such a filter element (10).

Description

Technical Field

[0001] This invention relates to a filter element for filtering fluids, particularly for a cartridge air filter for an internal combustion engine or as an interior space air filter, especially for an interior space air filter for a motor vehicle, and to 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. The particulate filter has a filter housing with an inlet for the fluid to be filtered and an outlet for the filtered fluid. According to one construction, the filter housing has an insertion opening for a filter element, allowing the filter element to be positioned in an insert-type compartment within the filter housing. Thus, the filter element, arranged in the insert-type compartment, allows the fluid to be filtered to flow along the main flow axis, preferably from bottom to top, during filter operation. The sealing device of the filter element enables a necessary sealing fit within the filter housing, thereby preventing undesired leakage or bypass flow of the gaseous fluid to be filtered around the filter element during filter operation.

[0003] DE 10 2008 036 913 B3 discloses an air filter system having a flat, plate-shaped filter element constructed as compactly as possible, yet still incorporating measures to resist clogging by snow and / or ice. Such an air filter system includes a frame into which the plate-shaped filter element is housed, the filter element having an untreated air side, a purified air side arranged substantially parallel thereto, and narrow sides extending substantially perpendicular to them; and the air filter system has a housing into which the frame, along with the filter element, can be inserted. In the case where the filter element has a rectangular base, there are a total of four narrow sides: two longitudinally extending narrow sides parallel to each other and two transversely extending narrow sides correspondingly perpendicular to the longitudinal narrow sides. A bypass valve is also provided, through which warm air, in the open state, reaches the area between the housing or frame and at least one narrow side, such that the warm air flows from there through the narrow sides into the filter element and out through the purified air side. Summary of the Invention

[0004] The objective of this invention is to provide an improved filter element for filtering fluids, which is resistant to clogging by suspended particles from the fluid.

[0005] Another task is to obtain a filter system for filtering fluids that can accommodate such replaceable filter elements.

[0006] According to one aspect of the invention, the aforementioned task can be solved by a filter element of a filter system having at least one filter bellows arranged in a frame and having a flat first inlet surface for a first fluid flow and at least one second inlet surface for a second fluid flow separated from the first fluid flow, wherein the second inlet surface is spaced apart from the first inlet surface, and wherein an untreated flow channel section provided for guiding the second fluid flow is arranged within the frame.

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

[0008] A filter element for filtering fluids is proposed, comprising at least one filter bellows arranged within a frame and having a flat first inlet surface for a first fluid flow and at least one second inlet surface for a second fluid flow, the second fluid flow being separate from the first fluid flow. The second inlet surface is spaced apart from the first inlet surface. A flow channel section on the untreated side, configured to guide the second fluid flow, is arranged within the frame.

[0009] The isolation device between the first and second inlet surfaces is advantageously constructed in a fluid-tight manner, particularly in a manner that is at least sufficiently fluid-tight. Here, "sufficiently fluid-tight" means that the isolation device is constructed in such a fluid-tight manner under normal operating conditions that the function of the filter element is practically unaffected. "Normal operating conditions" refers to the inflow of fluid, especially air, at normal atmospheric pressure without the aid of overpressure blowing. A leak is permissible if the function of the filter element remains practically unaffected, that is, if a leak does not allow particles larger than the medium in the filter element to pass through. The isolation device can be implemented within the filter bellows, for example, by means of an isolation wall made of plastic or the like extending into the filter bellows, or by means of an isolation wall attached to the filter bellows.

[0010] The filter bellows can be constructed in a single, integral manner, such that the two inflow surfaces are constructed within a single filter bellows made of filter media. Alternatively, the two inflow surfaces can be constructed within two separate filter bellows having the same or different filter media, and these two separate filter bellows can be arranged adjacent to each other within the filter element.

[0011] The filter element provides an advantageous filter system that allows for advantageous variant configurations with or without a suspended particle valve. This eliminates the need for additional injection molding dies if injection molding is used in the manufacture of the filter system.

[0012] In a flat filter, the flow direction is oriented, for example, perpendicular to the inlet and outlet surfaces, which are positioned on opposite flat surfaces of the filter bellows. Preferably, the inlet and outlet surfaces are formed in a filter with arranged pleats, in which folded edges are correspondingly present.

[0013] In a filter element according to the invention, for example, a filter element that can be configured as a plastic injection-molded filter element (KUF element), in addition to a main filtration region having a first inlet surface with a filter bellows, there is at least one additional filtration region having a second inlet surface for connection to another suction location of fluid, such as air. Connection to the other suction location can be achieved at the end side and / or through edge segments of regions separated at the plastic injection-molded filter element, by means of a portion of the second fluid flow being redirected. In this case, the edge segment is a surface element in the filter bellows near or adjacent to the periphery of the filter bellows, for example, a narrow side surface. In a particular embodiment, the first inlet surface and the second inlet surface may be parallel to each other.

[0014] The second fluid flow can come from the rear side of the filter bellows and be deflected, for example, by 180° or more, such that the first inlet surface and the second inlet surface are on the same side of the filter bellows.

[0015] Here, the additional, spaced-out filtration zones at the KUF element can be located at the edge of the filter element or inside the filter element. Multiple additional filtration zones with separate inlet surfaces can also be provided. These additional filtration zones can be configured for the same or different connection directions.

[0016] This configuration of the filter element offers significant advantages over existing technologies, such as snow valve solutions with paper-based filter elements, in which a nonwoven fabric is mounted on the untreated air side of the filter element, directly sealing the additional inlet channel. The filter element according to the invention has a separate inlet surface. A separate second fluid flow can be delivered through a second inlet surface in a separate filtration area, which can, for example, be heated. In this way, different airflows can be filtered using a plastic injection-molded filter element. For example, a filter bellows folded into a serrated shape and made of nonwoven fabric or the like can be used as the filter bellows.

[0017] The filter element, forming a separate additional filtration region on the second inlet surface, can be configured as a chamber separated from the first fluid flow. For this purpose, an isolation element can be provided. The walls of the chamber can thus effectively prevent overflow toward the main filtration region having the first inlet surface. The chamber can be implemented in a folded region on the edge side of the filter bellows by means of ribs acting as isolation elements. These ribs can be inserted into the filter bellows, or they can be attached to the folds of the pleated bellows.

[0018] If necessary, it is advantageous to use at least two different filter bellows with different filter media for the two inlet surfaces, such that each filter bellows has an inlet surface, which are then separated from each other by isolation elements. This can be achieved, for example, by constructing the filter bellows of the first inlet surface as a pleated filter and the filter bellows of the second filtration region as a non-woven fabric layer. The pleated filter has a significantly larger filtration area than the non-woven fabric layer, thus functionally dividing the area into a main filtration region and a secondary filtration region. The main filtration region, used for normal operation, is for regular flow when the first inlet surface can be freely passed through; and the secondary filtration region is for emergency flow when the first inlet surface is blocked.

[0019] The second fluid flow can be achieved using heated air. When the first fluid flow is mixed with suspended particles, such as snow, the filter element can operate in emergency mode via the second inflow. Even if the first inflow surface is blocked, the filter element can still perform its filtration task via the second inflow surface.

[0020] According to an advantageous configuration, at least one isolation element can be arranged in the filter bellows between the first inlet surface and the second inlet surface. This effectively prevents the first fluid flow, which should only reach the first inlet surface, from reaching the second inlet surface and thus preventing the second inlet surface from being blocked by suspended particles from the fluid. The fluid flow for the second inlet surface can preferably flow through this portion of the filter bellows, which is thus not blocked by suspended particles, such as snow.

[0021] According to an advantageous configuration, the flow channel section can be adjacent to the edge segment, for example, adjacent to the end face of the filter element. This allows for a compact configuration of the filter element. Advantageously, a flat filter bellows can be used, which is arranged in a frame that also surrounds the flow channel section. The filter bellows and the flow channel section can be injection molded together by a plastic frame.

[0022] According to an advantageous configuration, the flow channel section for the second fluid flow can have segments parallel or inclined to the narrow sides of the filter bellows and segments parallel or inclined to the flat surface of the filter bellows. Advantageously, the segments of the flow channel section are spatially curved in a manner that facilitates flow.

[0023] The second fluid flow can flow in the opposite direction to the first fluid flow through the first filtration region within the flow channel section, enter the filter bellows at the second inlet surface, and flow through the filter bellows in the same direction as the first fluid flow. The flow deflection, especially the flow reversal, within the flow channel section allows the inlet for the untreated side of the second fluid flow to be arranged in a way that facilitates the construction of space.

[0024] According to another advantageous configuration, the flow channel section for the second fluid flow can have segments facing the narrow side of the filter bellows and segments at an angle between 0° and 180° relative to the flat surface of the filter bellows.

[0025] According to another configuration, the flow channel section can be adjacent to any surface of the filter element, for example, it can be arranged in the middle of the filter element, wherein the filter bellows is interrupted in the region of the flow channel section and / or sealed relative to the flow channel section.

[0026] According to an advantageous configuration, a covering element can be provided that covers the flow channel section and the second inlet surface for the second fluid flow located at the end side. This closes the flow channel section toward one side of the filter element, for example, toward the untreated side, and deflects the second fluid flow toward the second inlet surface of the filter bellows. The covering element can be fixed to the filter bellows by an isolation element. The isolation element can be connected to the covering element for surface covering of the second inlet surface in a fluid-tight manner relative to the first fluid flow, preferably sufficiently fluid-tight under normal operating conditions. The covering element and the isolation element can, for example, be constructed of plastic. A separate, additional filtration area for the second inlet surface of the filter element can be configured as a chamber separated from the first fluid flow. The isolation element thus effectively prevents overflow of the second fluid flow toward the main filtration area having the first inlet surface. The isolation element can be a rib extending into or attached to the filter bellows.

[0027] According to an advantageous configuration, the frame can have a sealing surface configured to seal the filter bellows and flow channel sections relative to the housing, and to seal between the outflow side of the filter bellows and the untreated side of the flow channel sections. An integral seal in the form of a so-called felt ring element can be used as the sealing element. The felt ring element has a first sealing ring that seals the filter bellows and a second sealing ring that seals the flow channel sections but does not surround the filter surface.

[0028] According to an advantageous configuration, the filter element can be advantageously configured as a so-called drawer-type filter element for lateral insertion into the filter housing. The drawer-type filter element is an easy-to-install solution for assembling filter elements into a filter system, and it can also be easily replaced during maintenance. The drawer-type filter element can be introduced into the filter housing laterally in the flow direction. Alternatively, however, the filter element can also be installed from above into the lower housing component, which can then be closed by a housing cover.

[0029] According to an advantageous construction, at least one filter bellows can be folded into pleats in a zigzag pattern, the pleats having parallel, successively arranged folded edges along the longitudinal extension of the filter bellows, the folded edges extending correspondingly between opposite end edges of the filter bellows. Here, at least one filter bellows can be injection-molded around a continuous frame, the frame also surrounding the flow channel section. If two different filter bellows for two inlet regions are arranged in the filter element, the two filter bellows can also be injection-molded together around a continuous frame. Such a filter element can be advantageously used as an air filter, for example as an air filter for an internal combustion engine, and is a cost-effective and efficient solution for air filtration. The filter element can be easily installed with the aid of the injection-molded frame and can also be replaced when needed.

[0030] According to another aspect, the present invention relates to a filter system for filtering fluids, comprising a filter housing and a filter element for filtering fluids replaceably arranged in the filter housing between an untreated side and a purified side. The filter element has at least one filter bellows arranged in a frame and having a flat 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 spaced apart from the first inlet surface. Here, a flow channel on the untreated side for guiding the second fluid flow is guided from an inlet on the untreated side to the second inlet surface. The filter housing has a first inlet for allowing the first fluid flow to flow into the first inlet surface and at least a second inlet for allowing the second fluid flow to flow into at least the second inlet surface, wherein the flow channel sections of the flow channel are arranged within the filter element.

[0031] In the filter element of the filter system according to the invention—the filter system being capable of, for example, equipping a plastic injection-molded filter element (KUF element)—in addition to the main filtration region having a first inlet surface with a filter bellows, there is another filtration region having a second inlet surface for connection to another suction location of fluid, such as air. Flow passage sections for the second fluid flow are arranged within the frame and preferably adjacent to the filter bellows.

[0032] Here, the additional, spaced-apart filtration area at the KUF element can be located at the edge of the filter element or inside the filter element. Multiple filtration areas for different connection directions can also be constructed. This implementation of the filter element offers significant advantages over existing technologies, such as snow valve solutions with paper-made filter elements, in which nonwoven fabric can be mounted on the untreated air side of the filter element, directly sealing additional inlet channels. The filter element according to the invention has a separate inlet surface through which a separate second fluid flow can be delivered, which can, for example, be heated. In this way, different airflows can be filtered using a plastic injection-molded filter element. For example, a filter bellows folded into a serrated shape from nonwoven fabric can be used as a filter bellows.

[0033] According to an advantageous configuration, the flow channel can be guided from the untreated side inlet through at least a portion of the flat surface of the filter bellows to the second inlet surface. Connection to an additional suction location for the second fluid flow can therefore be achieved by means of, or without, the deflection of a portion of the second fluid flow on the flat surface of a spaced area at the plastic injection-molded filter element, and thus in a manner advantageous in terms of construction space technology.

[0034] According to an advantageous configuration, the flow channel can be guided from the untreated side inlet through at least a portion of the edge segment of the filter element to the second inlet surface. Connection to another suction location can therefore be achieved by means of deflection of a portion of the second fluid flow at the edge segment of a spaced area in the plastic-injection-coated filter element, and thus in a manner advantageous in terms of construction space technology.

[0035] According to an advantageous configuration, a valve can be arranged in the housing component at a second inlet for the second fluid flow. For spatial engineering reasons, the valve can be advantageously combined with the second inlet, thereby enabling a filter system that is as compact as possible. Furthermore, this allows the filter system to function reliably during normal operation with the highest possible filtration efficiency in the region of the first inlet surface.

[0036] According to an advantageous configuration, the inflow of fluid through the valve can be generated in a pressure-controlled manner or in a flow resistance-controlled manner. This advantageously allows the second fluid flow to enter the flow channel of the second inlet surface only when the first inlet surface is blocked, as this allows a corresponding negative pressure to be established in the filter system. Therefore, the area of ​​the second inlet surface in the filter element is only needed during emergency operation, while during normal operation, the first fluid flow only flows through the first inlet surface.

[0037] According to an advantageous construction, a flow chamber with a valve, such as a check valve, can be constructed within the housing component for the second fluid flow. This effectively prevents fluid flow from entering through the second inlet surface during normal operation, allowing it to do so only when the first inlet surface is blocked. Consequently, reliable function of the filter system during normal operation can be achieved with the highest possible filtration efficiency in the region of the first inlet surface.

[0038] According to an advantageous configuration, 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. The filter bellows can be advantageously configured as flat filter bellows. Flat filter bellows are an advantageous configuration for air filters and are advantageously used, especially, as drawer-type filters, thereby achieving an advantageous construction space ratio.

[0039] According to an advantageous configuration, the filter housing may have an insert-type compartment with a frame guide for the filter element, by means of which the filter element can be pushed into the insert-type compartment through an insertion opening in the filter housing, such that the seal of the filter element is circumferentially and sealingly abuts against the housing sealing surface in an axial direction relative to the main flow axis of the fluid. The flow direction of the fluid through the filter bellows is preferably oriented parallel to the main flow axis. A drawer-type filter element is an installation-friendly solution for assembling filter elements into a filter system, and it can also be easily replaced during maintenance. Alternatively, however, the filter element can be inserted, for example, from above into a lower housing component of the filter housing, which can then be closed by a housing cover.

[0040] The described filter system can be advantageously used as an air filter, especially as an air filter for an internal combustion engine or as an interior space air filter, particularly for the interior space air filter of a motor vehicle. Attached Figure Description

[0041] Other advantages are illustrated in the following figures, which depict embodiments of the invention. The figures, description, and claims encompass a large number of combinations of features. Those skilled in the art can also advantageously consider these features individually and combine them into other meaningful combinations. Exemplarily, for example:

[0042] Figure 1 The diagram shows a sectional isometric view of a filter system having a drawer-type filter element installed according to an embodiment of the invention, having an inlet surface for a first fluid flow and a second fluid flow.

[0043] Figure 2 Showing according to Figure 1 Detailed view of the filter system in the region of the second inlet surface;

[0044] Figure 3 An isometric view of a housing component is shown, the housing component having features for... Figure 1 The inlet of the second fluid flow in the filter system;

[0045] Figure 4 Shown from the basis Figure 1 Isometric view of the filter elements of the filter system;

[0046] Figure 5 Shown from the basis Figure 1 A cross-sectional isometric view of the filter element of the filter system. Detailed Implementation

[0047] In the accompanying drawings, identical or similar components are numbered using the same reference numerals. The drawings are for illustrative purposes only and should not be interpreted in a limiting manner.

[0048] Figure 1 The diagram shows a sectional isometric view of a filter system 100 having an installed drawer-type filter element 10 according to an embodiment of the invention, having inlet surfaces 54, 56 for a first fluid flow and a second fluid flow 60, 62; while... Figure 2 The text shows the data according to... Figure 1 Detailed view of the filter system 100 in the region of the second inlet surface 56. Figure 3 An isometric view of housing component 112, here for example, upper housing component 112, is shown, which has for... Figure 1 The inlet 106 of the second fluid flow 62 of the filter system 100.

[0049] The filter system 100 has a filter housing 110 with a first housing component 112 (e.g., upper housing component 112) and a second housing component 114 (e.g., lower housing component 114) and a filter element 10 for filtering fluid, which is replaceably arranged in the filter housing 110 between an untreated side 50 and a purified side 52. Here, the filter element 10 includes, for example, an integral filter bellows 12 having an inlet side 66 on the untreated side and an outlet side 68 on the purified side. The inlet side 66 includes a flat first inlet surface 54 for a first fluid flow 60 and a second inlet surface 56 for a second fluid flow 62, which is separate from the first fluid flow 60. The fluid flows 60 and 62 are indicated by broad arrows. In this example, the second inlet surface 56 is formed by an edge segment 30 of the filter bellows 12. The edge segment 30 can be circulated either along the flow direction 58 or inclined to the flow direction.

[0050] A first fluid flow 60 enters the filter housing 110 on the untreated side 50 through the first inlet 102 of the lower housing component 114, and then flows through the filter bellows 12 toward the purified side 52 along the flow direction 58 via the first inlet surface 54. A second fluid flow 62 enters the flow channel 130 through the inlet 106, in which an optional valve 116 is arranged, and is guided to the second inlet surface 56 through the flow channel. The two fluid flows 60 and 62 then exit from the filter housing 110 through the outlet 104. The second inlet surface 56 is fluid-tightly separated from the first inlet surface 54 by an isolation element 44 and a cover element 46 connected thereto. The cover element 46 is inserted, for example, into the isolation element 44 and the frame 28.

[0051] The flow channel 130 has a flow channel section 132 adjacent to the filter bellows 12 of the filter element 10. The filter bellows 12 and the flow channel section 132 are together surrounded by a frame 28, and in particular, the frame 28 is injection molded over. The cover element 46 closes the flow channel section 132 at its end face. The flow channel section 132 guides a second fluid flow 62 from the untreated side past the filter bellows 12. The second fluid flow 62 reaches the second inlet surface 56 by flow reversal. The inlet 106 is located on the side of the filter bellows 12 opposite to the two inlet surfaces 54, 56.

[0052] The frame 28 has a sealing surface 38 on which a sealing element 40 in the form of a felt ring is arranged to seal relative to the corresponding housing sealing surface 160 of the filter housing 110. The flow channel section 132 of the flow channel 130 is arranged between the filter bellows 12 and the end wall 138 of the frame 28.

[0053] The isolation element 44 is joined, for example, bonded to the pleats 34 of the filter bellows 12. The isolation element 44 is connected to the cover element 46 to cover the second inlet surface 56 relative to the first fluid flow 60. The cover element 46 is inserted into the end wall 138 of the isolation element 44 and the frame 28.

[0054] In this example, the filter element 10 with the filter bellows 12 is configured as a flat filter in the form of a drawer-type filter element. For this purpose, the filter housing 110 has an insert-type compartment 146 with a frame guide 158 for the filter element 10, by means of which the filter element 10 can be pushed into the insert-type compartment 146 transversely to the flow direction 58 through 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 an axial direction relative to the main flow axis 128 of the fluid. The flow direction 58 is parallel to the main flow axis 128. Here, the flow direction 58 is, for example, perpendicular to the inlet surfaces 54, 56 and the outlet side 68, or the outlet surface orientation. Preferably, the outlet and inlet surfaces form a surface at the filter bellows 12 with arranged pleats 34, in which corresponding folded edges 26 (on the inlet and outlet sides) are present. Figure 2 ).

[0055] Alternatively, other geometries of the filter element 10 can be provided, such as a tiered filter element instead of a flat filter.

[0056] An inlet 106 for a second fluid flow 62 is constructed in the upper housing component 112 of the filter housing 110, and this inlet has a valve 116 for the second fluid flow 62. The valve 116 is arranged at the second inlet 106 and can be configured, for example, as a check valve. Here, the inflow of fluid through the valve 116 can be achieved in a pressure-controlled or flow resistance-controlled manner. However, the valve 116 is not absolutely necessary for the function of the second inlet surface 56 as a separate filtration zone for emergency operation when the first inlet surface 54 is blocked.

[0057] Figure 3 Showing according to Figure 1 An isometric view of the upper housing component 112 of the filter system 100. The upper housing component 112 includes an outlet 104 on the purified side of the filter housing 110 for fluid exiting the filter housing 110 and a second inlet 106 for a second fluid flow 62 (see [reference]). Figure 1 and 2What can be seen is the housing sealing surface 160 of the filter housing 110, which seals the filter element 10 relative to the housing sealing surface by means of a seal 40 in the form of a felt ring element. Spacers 162 of the housing sealing surface 160 are arranged between the area for the purified side of the filter bellows 12 and the area for the untreated side of the flow channel section 132.

[0058] The housing component 112 has a lateral insertion opening 144 for the filter element 10, which is configured as a drawer-type filter element.

[0059] exist Figure 4 The text is a jumbled mess of characters and phrases, seemingly from different sources. A coherent translation isn't possible without further context or clarification. Figure 1 An isometric view of the filter element 10 of the filter system 100; and Figure 5 A cross-sectional isometric view of the filter element 10 is shown. The filter element 10 is configured as a flat filter in the form of a drawer-type filter element, and in addition to a plastic-injection-molded filter bellows 12 with a flow channel section 132, it also has a sealing element 42 at one end, by means of which the insertion opening 144 in the filter housing 110 is closed. A seal between the untreated side 50 and the purified side 52 of the filter 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 ).

[0060] The filter bellows 12 of the filter element 10 is folded into pleats 34 in a zigzag shape. The pleats have parallel folded edges 26 arranged successively in a longitudinal extension 14 between the opposing end edges 22 and 23 of the filter bellows 12, respectively, and are constructed on the inlet and outlet sides. The folded edges extend between the opposing end edges 22 and 23 of the filter bellows 12.

Claims

1. A filter element (10) for filtering fluid, having at least one filter bellows (12) arranged in a frame (28) and having a flat first inlet surface (54) for a first fluid flow (60) and at least one second inlet surface (56) for a second fluid flow (62), the second fluid flow being separate from the first fluid flow (60), wherein, The second inlet surface (56) is separated from the first inlet surface (54), and wherein the untreated side of the flow channel section (132) of the flow channel (130) for guiding the second fluid flow (62) is arranged within the frame (28), wherein a covering element (46) is provided that covers the flow channel section (132) for the second fluid flow (62) and the second inlet surface (56) at the end face.

2. The filter element according to claim 1, wherein, The flow channel section (132) is adjacent to the end face (23) or narrow side of the filter bellows (12).

3. The filter element according to claim 1, wherein, The flow channel section (132) for the second fluid flow (62) has segments parallel or inclined to the narrow side of the filter bellows (12) and segments parallel or inclined to the flat surface (24) of the filter bellows (12).

4. The filter element according to claim 1, wherein, The frame (28) has a sealing surface (38) configured to seal the filter bellows (12) and flow channel section (132) relative to the filter housing (110), and configured to seal between the outflow side (68) and the untreated side of the flow channel section (132) of the filter bellows (12).

5. The filter element according to any one of claims 1 to 4, wherein, The frame (28), together with the filter bellows (12) and the flow channel section (132), is constructed as a drawer-type filter element.

6. A filter system (100) for filtering fluids, having a filter housing (110) and a filter element (10) for filtering fluids, according to any one of claims 1 to 5, alternatively arranged in the filter housing (110) between an untreated side (50) and a purified side (52), having at least one filter bellows (12) arranged in a frame (28) and having a flat first inlet surface (54) for a first fluid flow (60) and at least one second inlet surface (56) for a second fluid flow (62), the second fluid flow being separate from the first fluid flow (60), wherein, The second inlet surface (56) is separated from the first inlet surface (54), wherein the flow channel (130) on the untreated side for guiding the second fluid flow (62) is guided from the inlet on the untreated side to the second inlet surface (56). The filter housing (110) has a first inlet (102) for allowing a first fluid flow (60) to flow into a first inlet surface (54) and a second inlet (106) for allowing a second fluid flow (62) to flow into at least a second inlet surface (56), and wherein the flow channel section (132) of the flow channel (130) is arranged within the filter element (10).

7. The filter system according to claim 6, wherein, The flow channel (130) is guided from the untreated side inlet through at least a portion of the flat surface (24) of the filter bellows (12) to the second inlet surface (56) and / or wherein the flow channel (130) is guided from the untreated side inlet through at least a portion of the edge segment (30) of the filter element (10) to the second inlet surface (56).

8. The filter system according to claim 6, wherein, In the housing component (112), a valve (116) is arranged in a second inlet (106) for the second fluid flow (62).

9. The filter system according to claim 8, wherein, In the flow channel (130) for the second fluid flow (62), at least one flow deflector is provided between the second inlet (106) and the second inflow surface (56).

10. The filter system according to claim 9, wherein, The inflow of fluid through the valve (116) is generated in a pressure-controlled manner or in a flow resistance-controlled manner.

11. The filter system according to claim 8, wherein, In the flow channel (130) for the second fluid flow (62), at least one flow reversal is provided between the second inlet (106) and the second inlet surface (56).

12. The filter system according to any one of claims 6 to 11, wherein, The filter element (10) is configured as a drawer-type filter element, which is introduced or can be introduced into the filter housing (110) transverse to the main flow axis (128) of the fluid.

Images