DE102020121710A1 - Filter system and filter element - Google Patents

Abstract

The invention relates to a filter system (100) for filtering a fluid, having a filter housing (110) and a filter element (10) for filtering the fluid, which is arranged in the filter housing (110) so that it can be replaced between a raw side (50) and a clean side (52). at least one filter bellows (12) which is arranged in a frame (28) and has an inflow side (66) and an outflow side (68) for the fluid to be filtered. The filter housing (110) has a first inlet (102) on the raw side for the inflow of a first fluid flow (60) and a second inlet (106) on the raw side for the inflow of a second fluid flow (62). A separating element (118) is provided adjacent to the inflow side (66) of the filter element (10), which has a first inflow channel (126) for supplying the first fluid flow (60) to a first inflow surface (54) of the inflow side (66) and at least one second inflow channel (130) for supplying the second fluid stream (62) to a second inflow surface (56) of the inflow side (66) of the filter element (10).
The invention also relates to a filter element (10).

Description

technical field

The invention relates to a filter system with a filter element for filtering a fluid, in particular for use in the air filter of an internal combustion engine or as a cabin air filter, in particular in a motor vehicle, and a filter element for such a filter system.

State of the art

In practice, particle filters are used to filter out particulate contaminants contained in gaseous fluids, such as air. The particle filters have a filter housing with an inlet for the fluid to be filtered and with an outlet for the filtered fluid. During filter operation, the filter element arranged in the filter housing can be flowed through by the fluid to be filtered along a main flow axis, preferably from bottom to top. A sealing device of the filter element enables the required tight fit of the filter element in the filter housing, so that during filter operation an undesired leakage or bypass flow of the gaseous fluid to be filtered around the filter element is counteracted.

In the DE 10 2008 036 913 B3 an air filter system with a flat, plate-like filter element is described, which is as compact as possible and which nevertheless provides measures to counteract the filter element becoming clogged with snow and/or ice. Such an air filter system provides a frame into which a plate-like filter element can be inserted, which has an untreated air side, a clean air side arranged essentially parallel thereto and narrow sides running essentially perpendicular thereto, and with a housing into which the frame together with the filter element can be inserted . If the filter element has a rectangular base area, there are a total of four narrow sides, two longitudinal narrow sides running parallel to one another and two transverse narrow sides running perpendicular to the longitudinal narrow sides. Furthermore, a bypass valve is provided, via which, when open, warm air reaches the area between the housing or the frame and at least one narrow side in such a way that the warm air flows from there through the narrow side into the filter element and flows out of the filter element through the clean air side.

Disclosure of Invention

An object of the invention is to provide an improved filter system having a filter element for filtering a fluid which counteracts clogging with airborne particles in the fluid.

A further object is to create a filter element for use in such a filter system.

According to one aspect of the invention, the aforementioned objects are achieved by a filter system for filtering a fluid with a filter housing and a filter element for filtering the fluid, which is arranged in the filter housing so that it can be exchanged between a dirty side and a clean side, with at least one filter bellows which is arranged in a frame and has an inflow side and an outflow side for the fluid to be filtered, wherein the filter housing has a first inlet on the raw side for the inflow of a first fluid stream and a second inlet on the raw side for the inflow of a second stream of fluid, wherein a separating element is provided adjacent to the inflow side of the filter element, that a first inflow channel for supplying the first fluid flow to a first inflow surface of the inflow side and at least one second inflow channel for supplying the second fluid flow to a second inflow surface of the inflow side of the filter element.

Favorable configurations and advantages of the invention result from the further claims, the description and the drawing.

A filter system for filtering a fluid is proposed, with a filter housing and a filter element for filtering the fluid, which is arranged in the filter housing so as to be interchangeable between a raw side and a clean side, with at least one filter bellows, which is arranged in a frame and has an inflow side and an outflow side for the has to be filtered fluid. The filter housing has a first inlet on the raw side for the inflow of a first fluid stream and a second inlet on the raw side for the inflow of a second stream of fluid. A separating element is provided adjacent to the inflow side of the filter element, which defines a first inflow channel for supplying the first fluid flow to a first inflow surface on the inflow side and at least a second inflow channel for supplying the second fluid flow to a second inflow surface on the inflow side of the filter element.

The separation between the first and second inflow surfaces is advantageously designed to be fluid-tight, in particular designed to be at least sufficiently fluid-tight. Sufficiently fluid-tight means that the separation is designed so fluid-tight under normal operating conditions that the function of the filter element is practically not disturbed will. A leak is tolerable if the function of the filter element remains practically undisturbed. The separation can be effected by a separating element, which is directly adjacent to the inflow side, so that two inflow channels are formed, which feed the two fluid streams onto the first inflow surface and the second inflow surface.

Favorably, a filter system can be provided that allows a favorable formation of variants with or without a suspended particle valve. As a result, components can be omitted, so that no additional injection molding tools are necessary if injection molding is used in the manufacture of the filter system.

In the case of a flat filter, the direction of flow is directed, for example, perpendicularly to the inflow surface and outflow surface, which are provided on opposite flat sides of the filter bellows in the case of a flat filter. In the case of a filter with erected folds, the outflow surface and the inflow surface preferably form the surfaces in which the fold edges lie in each case.

Advantageously, the filter bellows of the filter element can be folded in a zigzag shape into folds, with parallel fold edges that follow one another in a longitudinal extension of the filter bellows and each extend between opposite end edges of the filter bellows. In this case, the filter bellows can be spray-coated all around with a continuous frame, which also encloses the flow channel section. Such a filter bellows can be used advantageously as an air filter, for example of an internal combustion engine, and represents a cost-effective and efficient solution for an air filter. The molded-on frame means that the filter element can be easily installed and, if necessary, also replaced.

In the filter system according to the invention, which can be designed with a plastic-coated filter element (KUF element), for example, in addition to the main filtration area with a first inflow surface of the filter bellows, there is at least one further filtration area with a second inflow surface, which is used to connect a further suction point of a fluid, for example air, serves. The additional suction point can be connected via the inflow side to the plastic-encapsulated filter element with a partial deflection of the second fluid stream. The second fluid flow can be deflected in such a way that the first and second inflow surfaces are on the same side of the filter bellows.

The further separated filtration area on the inflow side of the KUF element, which is formed by the second inflow surface, can be located on the edge or inside the filter element. Several further filtration areas with further inflow surfaces can also be provided. These can be designed for the same or for different connection directions.

Such a design of the filter system has significant advantages over the prior art, which describes, for example, snow valve solutions with filter elements made of paper, in which a fleece can be attached to the filter element on the raw air side, which directly seals another inflow channel. The filter system according to the invention has a separate inflow surface on the filter element. A separate second fluid flow, which can also be heated, for example, can be supplied via the second inflow surface of the further filtration area. In this way it is possible to filter different air flows with a plastic-coated filter element. For example, a zigzag-folded filter bellows made of a fleece or the like can be used as the filter bellows. The filter bellows can advantageously be designed in one piece.

The separate, further filtration area of the filter system, which is defined by the second inflow area, can be provided as a second inflow channel that is separated from the first fluid flow via a separating element. The separating element can thus effectively prevent overflow to the main filtration area with the first inflow surface. The second inflow channel can be realized separated by the separating element in an edge-side fold area of the filter bellows. The separating element can connect to folds of the bellows.

The second flow of fluid can be done with heated air. The filter system can be operated in an emergency mode via the second fluid stream when the first fluid stream is blocked by suspended particles in the fluid, for example snow. The filter task of the filter system can be ensured by the second inflow surface even when the first inflow surface is clogged.

The separation between the "normal" air area and the "emergency" air area of the filter system can be formed by a partition wall on the housing side. The “emergency” air area is used to allow fluid to pass through the filter element, even if the “normal” air area is clogged with dirt, snow and the like. The separation and/or sealing in the area of the bellows height of the filter bellows is advantageously provided. Instead of, for example, as in the prior art, a pre-separator between the housing wall and To jam the bellows, the separation and/or sealing can advantageously take place via assembly elements on the housing side, filter element side and separating element side according to a tongue and groove principle. The tongue can be formed on the filter element and on the separating element and the groove on the housing side. Alternatively, it is also possible for the groove to be formed on the filter element and on the separating element, and for the tongue to be formed on the filter housing.

This connection via assembly elements can be present on at least two filter element sides. Alternatively, however, mounting elements can also be arranged on all four sides of the filter element, depending on the mounting requirements and the desired function. In this way, both the separating element and the filter element can be installed quickly and easily. A confusion-proof installation of separating element and filter element can also advantageously take place.

Furthermore, it is possible to attach the separating element to the filter element itself instead of to the filter housing. Such an integration of the separating element into the filter element enables a simple assembly of the separating element together with the filter element, which ensures that the two fluid streams flow onto the two inflow surfaces provided for this purpose.

Advantages of the filter system according to the invention consist in the separation between the "normal" air area and the "emergency" air area of the filter system. Furthermore, the assembly of the filter element via the assembly elements can take place according to a Poka-Yoke principle in an advantageous and non-confusing manner. The connection of the filter element to the filter housing, or also the connection of the separating element to the filter housing, can advantageously bring about a mechanical stabilization and stiffening of the filter housing.

The filter system according to the invention can be used particularly advantageously in vehicles in cold countries.

According to an advantageous embodiment, a valve can be arranged in or on the second inlet for the second fluid flow. For reasons of space, the valve can be conveniently combined with the second inlet, which means that the most compact filter system possible can be achieved. In addition, a reliable function of the filter system in normal operation can be achieved with the most effective possible filtering in the area of the first inflow surface.

According to an advantageous embodiment, the valve can be designed to be pressure-controlled or can be designed to be controlled by a flow resistance. This advantageously allows a second fluid flow to enter the second inflow channel of the second inflow surface only when the first inflow surface is clogged, since a corresponding negative pressure builds up in the filter system as a result. The area of the second inflow surface in the filter element is thus only used in emergency operation, while in normal operation a first fluid stream flows only over the first inflow surface.

According to an advantageous embodiment, the separating element between the second inlet and the inflow side of the filter element can have at least one flow guide for the second fluid flow. Flow control, in particular a flow reversal, in the second inflow channel allows the inlet for the second fluid flow to be arranged on the raw side in a manner that is particularly favorable in terms of installation space.

According to an advantageous embodiment, the separating element can be arranged in the lower housing part. This arrangement facilitates the assembly of the filter system since, after the separating element has been arranged, the filter element can be inserted into the lower housing part and the filter housing can then be closed with the upper housing part. The filter element can also be easily replaced in this way, without having to remove the separating element from the lower housing part.

According to an advantageous embodiment, the separating element can be arranged on the filter element. In an alternative arrangement, however, it is also possible for the separating element to be arranged on the filter element, for example on the frame of the filter element. In this way, the separating element can be integrated directly into the filter element. This ensures, for example, the correct positioning of the separating element relative to the filter bellows.

According to an advantageous embodiment, the separating element can be connected to complementary mounting elements on the housing via at least two mounting elements on the separating element side. The separating element can, for example, be connected to the filter housing in a simple and reproducible manner via such assembly elements, which are designed to engage in one another in a suitable manner. Such mounting elements can be implemented as a simple plug-in connection. The separating element can also be easily replaced if necessary. The interlocking mounting elements can also ensure an adequate seal to separate the two fluid flows.

According to an advantageous embodiment, the assembly elements on the housing side can be provided for sealing off the first and second fluid streams from one another on the raw side via complementary assembly elements on the filter element side. The frame of the filter element can also have mounting elements which engage in the mounting elements on the housing. As a result, the filter element can be mounted, for example, in the lower housing part, in which case the lower housing part is then also mechanically reinforced by the filter element. In addition, the connection of the assembly elements on the filter element side with the assembly elements on the housing side can ensure that the two fluid flows are sealed off from one another in the filter housing.

According to an advantageous embodiment, the mounting elements can be designed in a complementary manner according to a tongue/groove principle. The interlocking of the assembly elements on the housing side with the separating element side and the filter element side can be implemented in a simple manner using a tongue/groove principle. The groove can be arranged on the wall of the filter housing and the tongue on the separating element or the frame of the filter element. Alternatively, it is also possible that the tongue is arranged on the wall of the filter housing and the grooves on the separating element and on the frame of the filter element.

According to an advantageous embodiment, the raw side can be sealed from the clean side of the filter housing by means of a seal running around the frame of the filter element, which is arranged between a sealing surface of the lower housing part and a sealing surface of the upper housing part when the filter element is properly installed in the filter housing.

According to an advantageous embodiment, an upper edge of the separating element can end with fold edges of folds of the filter bellows on the raw side. This results in the best possible connection of the separating element to the filter bellows. In this way it can be achieved that the two fluid streams only flow against the inflow surfaces of the filter bellows provided for this purpose and cannot already mix on the unfiltered side of the filter bellows.

According to an advantageous embodiment, the lower housing part can have a circumferential support surface for the filter element, which is aligned with the upper edge of the separating element and a lower edge of the frame of the filter element rests on the support surface in the assembled state. The contact surface ensures that the filter element can dip into the lower housing part up to the depth specified by the contact surface. The lower fold edges of the folds of the filter bellows are thus fixed at a predetermined height, so that the upper edge of the separating element reaches up to the fold edges and the second fluid flow only flows onto the inflow surface provided for this purpose.

According to a further aspect, the invention relates to a filter element for inclusion in a filter system, with at least one filter bellows which is arranged in a frame and which has a first flat inflow side and a second flat outflow side. An outside of the frame has at least two mounting elements on the filter element side, which interact with complementary mounting elements on the housing when mounted as intended in a filter housing.

Advantageously, the filter bellows of the filter element can be folded in a zigzag shape into folds, with parallel fold edges that follow one another in a longitudinal extent of the filter bellows and each extend between opposite end edges of the filter bellows. In this case, the filter bellows can be molded all around with a continuous frame, which also includes the flow channel section. Such a filter bellows can be used advantageously as an air filter, for example of an internal combustion engine, and represents a cost-effective and efficient solution for an air filter. The molded-on frame means that the filter element can be easily installed and, if necessary, also replaced.

In the filter element according to the invention, which can be designed as a plastic-encapsulated filter element (KUF element), for example, in addition to the main filtration area with a first inflow surface of the filter bellows, there is at least one additional filtration area with a second inflow surface, which is used to connect a further suction point of a fluid, for example air, serves. The additional suction point can be connected via the inflow side to the plastic-encapsulated filter element with a partial deflection of the second fluid stream. The second fluid flow can be deflected in such a way that the first and the second inflow surface are on the same side of the filter bellows.

The further separated filtration area of the second inflow surface on the KUF element can be located on the edge or inside the filter element. Several filtration areas can also be designed for different connection directions. Such a design of the filter element has significant advantages over the prior art, which describes, for example, snow valve solutions with filter elements made of paper, in which the filter element A fleece can be attached to the raw air side, which directly seals another inflow channel. The filter element according to the invention has a separate inflow surface, via which a separate second fluid flow, which can also be heated, for example, can be supplied. In this way it is possible to filter different air flows with a plastic-coated filter element. For example, a zigzag-folded filter bellows made of a fleece can be used as the filter bellows.

An embodiment of a filter system with such a filter element has significant advantages over the prior art, which describes, for example, snow valve solutions with filter elements made of paper, in which a fleece can be attached to the filter element on the raw air side, which directly seals another inflow channel. The filter system according to the invention has a separate inflow surface on the filter element. A separate second fluid flow, which can also be heated, for example, can be supplied via the second inflow surface of the further filtration area. In this way it is possible to filter different air flows with a plastic-coated filter element. For example, a zigzag-folded filter bellows made of a fleece or the like can be used as the filter bellows. The filter bellows can advantageously be designed in one piece.

According to an advantageous embodiment, the mounting elements can be designed in a complementary manner according to a tongue/groove principle. The interlocking of the assembly elements on the housing side with the separating element side and the filter element side can be implemented in a simple manner using a tongue/groove principle. The groove can be arranged on the wall of the filter housing and the tongue on the separating element or the frame of the filter element. Alternatively, it is also possible that the tongue is arranged on the wall of the filter housing and the grooves on the separating element and on the frame of the filter element.

According to an advantageous embodiment, a peripheral seal on a strip running around the outside of the frame can be provided for sealing a dirty side from a clean side when installed as intended in a filter housing. Such a seal can be used in a suitable manner to seal the filter element in the filter housing to separate the raw side from the clean side of the filter system. The filter element can also seal the filter housing from the environment with the seal arranged on the strip at the point of separation between the lower housing part and the upper housing part.

According to an advantageous embodiment, a separating element can be provided on the frame, adjacent to the inflow side, for a separate supply of a first fluid flow to a first inflow surface of the inflow side of the filter element and a second fluid flow to a second inflow surface. It is possible for the separating element, which separates the fluid flow on the raw side into a first fluid flow and a second fluid flow, to be arranged on the filter element, for example on the frame of the filter element. In this way, the separating element can be integrated directly into the filter element. This ensures, for example, the correct positioning of the separating element relative to the filter bellows. In this way, the first fluid flow can be guided reliably onto the first inflow surface of the filter element and the second fluid flow onto the second inflow surface.

The filter system described can advantageously be used as an air filter, in particular as an air filter of an internal combustion engine or as an interior air filter, in particular of a motor vehicle.

character list

Further advantages result from the following description of the drawings. Exemplary embodiments of the invention are shown in the drawings. The drawings, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into further meaningful combinations.

• 1 eine isometrische Darstellung eines Filtersystems nach einem Ausführungsbeispiel der Erfindung;
• 2 eine Explosionsdarstellung des Filtersystems nach 1 ;
• 3 eine isometrische Darstellung des Gehäuseunterteils nach 1 mit montiertem Trennelement;
• 4 eine Detailansicht von gehäuseseitigen und trennelementseitigen Montageelementen;
• 5 eine Seitenansicht des Filtersystems nach 1 mit eingezeichneten Schnittebenen A-A und D-D;
• 6 einen Querschnitt durch das Filtersystem in der Schnittebene A-A gemäß 5;
• 7 eine Detailansicht B von gehäuseseitigen und filterelementseitigen Montageelementen gemäß 6;
• 8 einen Längsschnitt durch das Filtersystem in der Schnittebene D-D gemäß 5;
• 9 eine Detailansicht E des Ventils gemäß 8;
• 10 eine Seitenansicht eines Filterelements nach einem Ausführungsbeispiel der Erfindung;
• 11 eine Detailansicht F der filterelementseitigen Montageelemente gemäß 10;
• 12 eine Explosionsdarstellung eines Filtersystems nach einem weiteren Ausführungsbeispiel der Erfindung;
• 13 eine isometrische Darstellung des Gehäuseunterteils nach 12 mit montiertem Trennelement;
• 14 eine Detailansicht von gehäuseseitigen und trennelementseitigen Montageelementen;
• 15 eine Seitenansicht des Filtersystems nach 12 mit eingezeichneten Schnittebenen B-B und D-D;
• 16 einen Querschnitt durch das Filtersystem in der Schnittebene D-D gemäß 15;
• 17 eine Detailansicht E von gehäuseseitigen und filterelementseitigen Montageelementen gemäß 16;
• 18 einen Längsschnitt durch das Filtersystem in der Schnittebene B-B gemäß 15;
• 19 eine Seitenansicht eines Filterelements nach einem weiteren Ausführungsbeispiel der Erfindung; und
• 20 eine Detailansicht F der filterelementseitigen Montageelemente gemäß 19.

Examples show:

• 1 an isometric view of a filter system according to an embodiment of the invention;
• 2 an exploded view of the filter system 1 ;
• 3 an isometric view of the lower part of the housing 1 with mounted divider;
• 4 a detailed view of the housing-side and separator-side assembly elements;
• 5 a side view of the filter system 1 with section planes AA and DD drawn in;
• 6 according to a cross section through the filter system in the section plane AA 5 ;
• 7 a detailed view B of housing-side and filter element-side assembly elements according to FIG 6 ;
• 8th according to a longitudinal section through the filter system in the section plane DD 5 ;
• 9 a detailed view E of the valve according to FIG 8th ;
• 10 a side view of a filter element according to an embodiment of the invention;
• 11 a detailed view F of the filter element-side mounting elements according to FIG 10 ;
• 12 an exploded view of a filter system according to a further embodiment of the invention;
• 13 an isometric view of the lower part of the housing 12 with mounted divider;
• 14 a detailed view of the housing-side and separator-side assembly elements;
• 15 a side view of the filter system 12 with section planes BB and DD drawn in;
• 16 according to a cross section through the filter system in the section plane DD 15 ;
• 17 a detailed view E of mounting elements on the housing side and on the filter element side according to FIG 16 ;
• 18 according to a longitudinal section through the filter system in the section plane BB 15 ;
• 19 a side view of a filter element according to a further embodiment of the invention; and
• 20 a detailed view F of the filter element-side mounting elements according to FIG 19 .

Embodiments of the invention

In the figures, the same or similar components are denoted by the same reference symbols. The figures only show examples and are not to be understood as limiting.

1 shows an isometric view of a filter system 100 according to an embodiment of the invention, which is shown in 2 shown in detail in an exploded view.

The filter system 100 for filtering a fluid, in particular air, has a filter housing 110 which consists of a lower housing part 114 and an upper housing part 112 . In the filter housing 110, a filter element 10 for filtering the fluid, with at least one filter bellows 12, is arranged interchangeably between a raw side 50 and a clean side 52 of the filter housing 110. The filter bellows 12 can consist, for example, of a zigzag-folded fleece, the folds 34 being stabilized against the flow pressure by a stiffening element 78 arranged in the longitudinal direction of the filter bellows 12 . The filter bellows 12 is arranged in a frame 28, for example encapsulated with plastic, and has an inflow side 66 and an outflow side 68 for the fluid to be filtered. The filter housing 110 has a first inlet 102 on the raw side for the inflow of a first fluid flow 60 and a second inlet 106 on the raw side for the inflow of a second fluid flow 62 . The upper part of the housing also has an outlet 104 on the clean side for the filtered fluid. Inside the filter housing 110, a separating element 118 is provided adjacent to the inflow side 66 of the filter element 10, which has a first inflow channel 126 for supplying the first fluid stream 60 to a first inflow surface 54 of the inflow side 66 and at least one second inflow channel 130 for supplying the second fluid stream 62 defined on a second inflow surface 56 of the inflow side 66 of the filter element 10 . The first inflow channel 126 supplies fluid to the "normal" air region of the filter element 10. The second inflow channel 130 supplies fluid to an "emergency" air region of the filter element 10.

A valve 116 is positioned in the second inlet 106 for the second fluid stream 62 . The valve 116 can be designed to be pressure-controlled or can be designed to be controlled by a flow resistance.

An outer side 82 of the frame 28 of the filter element 10 has at least two mounting elements 70 on the filter element side which, when mounted as intended in the filter housing 110, interact with complementary mounting elements 72 on the housing and result in an interlocking connection. All four sides of the frame 28 can also have such mounting elements 70 . The assembly elements 70, 72 can, for example, be of complementary design according to the tongue/groove principle.

The separating element 118 is arranged in the lower housing part 114 and causes a flow direction for the second fluid flow 62 between the second inlet 106 and the inflow side 66 of the filter element 10, since the fluid flow 62 flows in horizontally and is deflected vertically in the direction of the inflow side 66 of the filter element 10 . The directions of flow of the first and second fluid streams 60, 62 are indicated by dashed arrows in FIG 2 shown.

Alternatively, the separating element 118 could also be attached directly to the frame 28 of the filter element 10, adjacent to the inflow side 66, for a separate supply of a first fluid flow 60 to a first inflow surface 54 of the inflow side 66 of the Filter element 10 and a second fluid stream 62 may be provided on a second inflow surface 56 .

The raw side 50 is sealed against the clean side 52 of the filter housing 110 by means of a seal 40 running all the way around the frame 28 of the filter element 10, which, when the filter element 10 is properly installed in the filter housing 110, between a sealing surface 166 of the lower housing part 114 and a sealing surface 168 of the upper housing part 112 is arranged. After the filter element 10 has been inserted into the lower housing part 114, a lower edge 80 of the frame 28 of the filter element 10 rests on the bearing surface 164 inside the lower housing part 114, which is formed by the shoulder 162 in the housing wall 138. Thereafter, the upper housing part 112 is put on, as a result of which the filter housing 110 is closed. Here, the overlapping segment 170 of the upper housing part 112 covers the seal 40 . The two housing parts 112, 114 can be held together, for example, by clamps. In the process, the seal 40 is pressed between the two sealing surfaces 166 , 168 .

The separating element 118 is arranged in the lower housing part 114 in such a way that an upper edge 120 of the separating element 118 ends with fold edges 26 of folds 34 of the filter bellows 12 on the raw side. The peripheral support surface 164 for the filter element 10 is aligned with the upper edge 120 of the separating element 118 when the lower edge 80 of the frame 28 of the filter element 10 rests on the support surface 164 in the assembled state. This ensures tight guidance of the second fluid flow 62 onto the second inflow surface 56 (in 6 shown) of the filter element 10 ensured.

3 11 shows an isometric view of the housing base 114. FIG 1 with fitted divider 118. In 4 a detailed view of the mounting elements 72, 74 on the housing side and on the separating element side is shown.

The separating element 118 is connected via two mounting elements 74 on the separating element to complementary mounting elements 72 on the housing and is thus mounted in the lower housing part 114 . The assembly elements 70, 72, 74 are designed in a complementary manner according to a tongue/groove principle. In the exemplary embodiment shown, the mounting elements 72 on the housing are designed as grooves, into which the mounting elements 74 on the separating element side, designed as a spring, can engage. The groove 72 protrudes from the housing wall 138 as a double web. In this way, the mounting element 74 on the side of the separating element can latch with one of the two individual webs. In this way, the mounting elements 72 on the housing are not only provided for mounting, but also for sealing the first and second fluid streams 60, 62 from one another on the raw side via the complementary mounting elements 70 on the filter element side.

In 5 10 is a side view of the filter system 100 of FIG 1 shown with drawn section planes AA and DD. 6 shows a cross section through the filter system 100 in the section plane AA according to FIG 5 seen from the inflow side 66 of the filter element 10, while in 7 a detailed view B of housing-side and filter element-side mounting elements 72, 70 according to FIG 6 is shown.

The filter element 10 has mounting elements 70 on all four sides, which can latch with mounting elements 72 on the housing. The inflow side 66 of the filter bellows 12 is divided by the separating element 118 into the first inflow surface 54, on which the first fluid flow flows via the first inlet 102, and into the second onflow surface 56, on which the second fluid flow flows via the second inlet 106. The separation between the first inflow surface 54 and the second inflow surface 56 is in 6 drawn in dashed. In 7 It can be seen in detail how the mounting element 70 designed as a spring on the filter element side engages in the mounting element 72 on the housing side designed as a groove.

8th shows a longitudinal section through the filter system 100 in the section plane DD according to FIG 5 , while in 9 a detailed view E of the valve 116 according to FIG 8th is shown.

On average in 8th the sealing of the raw side 50 and the clean side 52 of the filter system 100 in the filter housing 110 and the sealing of the filter housing 110 can be seen in itself. In the case of the filter element 10 , a seal 40 running around on a strip 38 running around the outside of the frame 28 is provided for sealing the raw side 50 against the clean side 52 when installed as intended in a filter housing 110 . When the filter element 10 is inserted into the lower housing part 114 , the seal 40 rests on the sealing surface 166 of the lower housing part 114 . If the upper housing part 112 is placed on the lower housing part 114 , the sealing surface 168 of the upper housing part 112 comes to rest on the seal 40 . The overlapping segment 170 of the upper housing part 112 covers the seal 40 . If the two housing parts 112, 114 are pressed together, for example with a clamp, then the seal 40 is pressed by the two sealing surfaces 166, 168. The raw side 50 is thus sealed off from the clean side 52 by the filter element 10 . The filter housing 110 is thus also sealed against the environment.

On average in 9 the functioning of the valve 116 can be seen. The valve 116 shows the usual design of a check valve. The valve 116 essentially has a closure element 123 which is pressed against a valve seat 125 by a valve spring 124 pretensioned against a valve housing 122 . In this way, the valve 116 opens under an overpressure from an outside of the filter housing 110, whereby a second stream of fluid 62 can flow into the filter housing 110.

In 10 A side view of a filter element 10 according to an embodiment of the invention is shown while 11 a detailed view F of the mounting elements 70 on the filter element side according to FIG 10 displays. A mounting element 70 arranged on the outside 82 of the frame 28 is shown in the side view 11 can be seen in an enlargement. The mounting element 70 is designed as a web.

Next is in the side view in 10 the seal 40 arranged on the peripheral strip 38 on the frame 28 of the filter element 10 can be seen, which represents a peripheral edge 76 of the filter element 10 .

In the 12 until 20 a further exemplary embodiment of a filter system 100 according to the invention is shown. 12 shows an exploded view of the filter system 100, 13 an isometric view of the housing base 114 after 12 with mounted separator 116 and 14 a detailed view of mounting elements 72, 74 on the housing side and on the separating element side. 15 10 shows a side view of the filter system 100 according to FIG 12 with marked section planes BB and DD, 16 a cross section through the filter system 100 in the section plane DD according to FIG 15 and 17 a detailed view E of assembly elements 72, 70 on the housing side and on the filter element side according to FIG 16 . In 18 FIG. 1 is a longitudinal section through the filter system 100 in the section plane BB according to FIG 15 shown while 19 a side view of the filter element 10 and 20 a detailed view F of the mounting elements 70 on the filter element side according to FIG 19 displays.

That in the 12 until 20 The filter system 100 shown has in principle the same structure as that in FIGS 1 until 11 The main difference is that the mounting elements 70, 72, 74 show a tongue/groove principle, in which the mounting elements 72 on the housing side are designed as a tongue. In order to avoid unnecessary repetition, only the figures with the relevant different features will be discussed.

In 13 and magnified in 14 the housing-side mounting elements 72 can be seen as webs protruding inwards from the housing wall 138, which can be encompassed by the separating-element-side mounting element 74 in order to produce a stable connection between the housing lower part 114 and the separating element 116. The mounting elements 74 on the separating element side can be designed in the same way as in the case of FIG 4 illustrated embodiment shown.

The cross section of the filter element is 10 in 16 shows that the filter element 10 and the lower housing part 114 only have mounting elements 70, 72 on two sides, which on the one hand form the connection between the lower housing part 114 and the separating element 116, as in 14 shown, as well as the filter element 10 are used. In the enlargement in 17 It can be seen how the mounting element 72 on the housing, designed as a web, engages in a groove in the frame 28 of the filter element 10 as the mounting element 70 on the filter side.

The mounting element 70 on the filter element side, designed as a groove, in the frame 28 of the filter element 10 is in 19 and magnified in 20 clearly visible.

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 102008036913 B3 [0003]

Claims (16)

Filter system (100) for filtering a fluid, having a filter housing (110) and a filter element (10) arranged in the filter housing (110) to be exchangeable between a raw side (50) and a clean side (52) for filtering the fluid, with at least one filter bellows ( 12) which is arranged in a frame (28) and has an inflow side (66) and an outflow side (68) for the fluid to be filtered, the filter housing (110) having a first inlet (102) on the raw side for the inflow of a first fluid stream ( 60) and a second inlet (106) on the raw side for the inflow of a second fluid flow (62), wherein a separating element (118) is provided adjacent to the inflow side (66) of the filter element (10), which has a first inflow channel (126) for supply of the first fluid flow (60) onto a first inflow surface (54) on the inflow side (66) and at least one second inflow channel (130) for feeding the second fluid flow (62) onto a second inflow surface (56) on the inflow side (6 6) of the filter element (10) defined. filter system after claim 1 , wherein a valve (116) is arranged in or at the second inlet (106) for the second fluid stream (62). filter system after claim 2 , wherein the valve (116) is designed to be pressure-controlled or is designed to be controlled by a flow resistance. Filter system according to one of the preceding claims, wherein the separating element (118) between the second inlet (106) and the upstream side (66) of the filter element (10) has at least one flow guide for the second fluid stream (62). Filter system according to one of the preceding claims, wherein the separating element (118) is arranged in the housing base (114). Filter system according to one of Claims 1 until 4 , wherein the separating element (118) is arranged on the filter element (10). Filter system according to one of the preceding claims, in which the separating element (118) is connected via at least two mounting elements (74) on the separating element side to complementary mounting elements (72) on the housing side. filter system after claim 7 , wherein the assembly elements (72) on the housing side are provided for sealing off the first and second fluid streams (60, 62) from one another on the raw side via complementary assembly elements (70) on the filter element side. Filter system according to one of Claims 7 or 8th , wherein the mounting elements (70, 72, 74) are formed in a complementary manner according to a tongue/groove principle. Filter system according to one of the preceding claims, wherein the raw side (50) is sealed against the clean side (52) of the filter housing (110) via a seal (40) running around the frame (28) of the filter element (10) which, when installed as intended of the filter element (10) is arranged in the filter housing (110) between a sealing surface (166) of the lower housing part (114) and a sealing surface (168) of the upper housing part (112). Filter system according to one of the preceding claims, wherein an upper edge (120) of the separating element (118) terminates with fold edges (26) of folds (34) of the filter bellows (12) on the raw side. filter system after claim 11 , wherein the lower housing part (114) has a circumferential support surface (164) for the filter element (10), which is aligned with the upper edge (120) of the separating element (118) and a lower edge (80) of the frame (28) of the filter element (10) rests on the support surface (164) when assembled. Filter element (10) for accommodation in a filter system (100) according to one of the preceding claims, with at least one filter bellows (12) which is arranged in a frame (28) and which has a first flat inflow side (66) and a second flat outflow side ( 68), wherein an outer side (82) of the frame (28) has at least two mounting elements (70) on the filter element side which, when mounted as intended in a filter housing (110), interact with complementary mounting elements (72) on the housing side. filter element after Claim 13 , wherein the mounting elements (70, 72) are designed to be complementary according to a tongue/groove principle. filter element after Claim 13 or 14 , a peripheral seal (40) on a strip (38) running around the outside of the frame (28) for sealing a dirty side (50) against a clean side (52) when installed as intended in a filter housing (110). Filter element according to one of Claims 13 until 15 , wherein on the frame (28) a separating element, adjacent to the upstream side (66), for a separate supply of a first fluid stream (60) is provided on a first inflow surface (54) of the inflow side (66) of the filter element (10) and a second fluid stream (62) on a second inflow surface (56).

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