A filter system comprising a secondary filter element and a primary filter element, and the use of a secondary filter element in a filter system.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- MANN HUMMEL GMBH
- Filing Date
- 2024-05-14
- Publication Date
- 2026-06-19
AI Technical Summary
Existing filter systems with primary and secondary filter elements do not effectively address the need for additional protection of the clean side during primary filter element replacement or when substances not retained by the primary filter element are present, and they lack efficient mechanisms for handling harmful gases.
A filter system design featuring a secondary filter element positioned inside the primary filter element, with a non-rotatable coupling mechanism using threaded portions and complementary interfaces, allowing for sequential fluid flow and incorporating an adsorbent like activated carbon to capture harmful gases.
Provides additional protection to the clean side of the filter system, ensures operational safety by preventing unnecessary element replacements, and effectively removes harmful gases, particularly beneficial in systems sensitive to such gases like fuel cell systems.
Smart Images
Figure 2026520072000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a filter system for filtering gaseous fluids, especially air, comprising a secondary filter element and a primary filter element, and to the use of the secondary filter element in a filter system.
Background Art
[0002] A filter system comprising a primary filter element and a secondary filter element arranged downstream with respect to the flow is known, for example, in air filter systems. The secondary filter element functions as a safety element for protecting the clean side of the filter system, for example, when replacing the primary filter element.
Summary of the Invention
[0003] An object of the present invention is to provide an improved filter system comprising a secondary filter element and a primary filter element.
[0004] A further object of the present invention is to provide the use of a secondary filter element in an improved filter system.
[0005] According to one aspect of the present invention, the above object is a filter system comprising a housing having a fluid inlet and a fluid outlet, at least one primary filter element and one secondary filter element are arranged in the housing between the fluid inlet and the fluid outlet, the secondary filter element is arranged in the hollow interior of the primary filter element, and the primary filter element and the secondary filter element are at least temporarily sequentially flowable by the fluid to be filtered, especially gaseous fluid, especially air, the housing comprises at least one connecting element at the fluid outlet for connecting to a connecting device arranged on the secondary filter element, The secondary filter element is a filter medium body that is permeable to the fluid to be filtered, and includes a filter medium body that extends along the longitudinal axis, encloses a hollow interior, and has an open end and a closed end located on opposite sides along the longitudinal axis. The filter media body of the secondary filter element contains an adsorbent, especially activated carbon. The coupling device is positioned at the open end of the filter media body of the secondary filter element. The filter system is characterized in that the coupling device is configured to be non-rotatably coupled to the primary filter element, at least one coupling element of the housing is configured as a threaded portion and is complementary to the threaded portion of the coupling element of the secondary filter element, and the threaded portion of the coupling element of the secondary filter element is engageable with the threaded portion of the coupling element of the housing.
[0006] An object according to a further aspect of the present invention is the use of a secondary filter element in a filter system, The secondary filter element is a filter medium body that is permeable to the fluid to be filtered, and includes a filter medium body that extends along the longitudinal axis, encloses a hollow interior, and has an open end and a closed end located on opposite sides along the longitudinal axis. The filter media body of the secondary filter element contains an adsorbent, especially activated carbon. The secondary filter element is positioned inside the hollow of the primary filter element of the filter system, and the primary and secondary filter elements are sequentially passed through, at least temporarily, by the fluid to be filtered, especially gaseous fluids, especially air, during the operation of the filter system. The filter system housing is provided with at least one connecting element at the fluid outlet for connecting to a connecting device located on the secondary filter element. The coupling device is positioned at the open end of the filter media body of the secondary filter element. The secondary filter element is non-rotatably coupled to the primary filter element by a coupling device. The threaded portion of the connecting element of the secondary filter element is engaged with the connecting element of the housing, which is configured as a threaded portion, and this is resolved by use.
[0007] Useful embodiments and advantages of the present invention can be derived from additional claims, specifications, and drawings.
[0008] According to one embodiment, the present invention is based on a filter system comprising a housing having a fluid inlet and a fluid outlet, wherein at least one primary filter element and one secondary filter element are arranged within the housing between the fluid inlet and the fluid outlet, the secondary filter element being located inside the hollow interior of the primary filter element, and the primary and secondary filter elements are at least temporarily sequentially passable by the fluid to be filtered, in particular a gaseous fluid, in particular air. The housing comprises at least one coupling element at the fluid outlet for coupling to a coupling device located on the secondary filter element. The secondary filter element comprises a filter media body permeable to the fluid to be filtered, extending along a longitudinal axis, enclosing a hollow interior, and having an open end and a closed end located on opposite sides along the longitudinal axis. The filter media body of the secondary filter element comprises an adsorbent, in particular activated carbon. The coupling device is located at the open end of the filter media body of the secondary filter element.
[0009] According to the present invention, the coupling device is configured to be non-rotatably coupled to the primary filter element. At least one coupling element of the housing is configured as a threaded portion and is complementary to the threaded portion of the coupling element of the secondary filter element. In this regard, the threaded portion of the coupling element of the secondary filter element is engageable with the threaded portion of the coupling element of the housing.
[0010] The secondary filter element is positioned downstream of the primary filter element with respect to the flow, and can provide additional protection to the clean side, for example, when the primary filter element is replaced or against substances that the primary filter element does not retain. Advantageously, the primary and secondary filter elements are interchangeable independently of each other. This allows for consideration of different loads on the primary and secondary filter elements, and thus avoids unnecessary replacement of either the primary or secondary filter element.
[0011] Advantageously, the secondary filter element may have an interface for connecting to the primary filter element and an interface for connecting to the housing of the filter system. This allows the secondary filter element to be advantageously non-rotatably mounted within the housing, even when significant mechanical loads and vibrations are acting on it during operation.
[0012] In a secondary filter element, the filter media itself contains an adsorbent, allowing it to remove most of the harmful gases that have passed through the primary filter element from the fluid. This is particularly useful when using a filter system in a system that includes components that are sensitive to harmful gases. Particularly advantageous is the use of a filter system with a secondary filter element in a fuel cell system to filter the cathode intake. Harmful gases can degrade or even destroy the membrane between the cathode and anode of a fuel cell.
[0013] Beneficially, the connecting element may be configured in a sleeve shape and have an interface for connecting to the secondary filter element and a separate interface for connecting to the housing. Beneficially, the connection to the primary filter element may be designed to be non-rotatable. This can further improve the operational safety of the filter system with the secondary filter element.
[0014] The secondary filter element can be connected to the filter housing, for example, by a threaded portion, which makes it possible to functionally upgrade existing filter systems with conventional secondary filter elements that do not have gas adsorption capabilities, in a particularly simple manner. Advantageously, the non-rotatable connection between the primary and secondary filter elements can, in this case, be used indirectly via the primary filter element to screw the secondary filter element into or out of the threaded portion on the housing side.
[0015] Advantageously, at least one connecting element may be configured with a threaded portion complementary to the male threaded portion of the threaded socket of the connecting element. This provides an advantageous non-rotatable connection between the secondary filter element and the housing. Alternatively, a simple plug-in connection may also exist.
[0016] According to a beneficial embodiment of the filter system, the primary filter element comprises a filter media body permeable to the fluid to be filtered, extending along its longitudinal axis, enclosing a hollow interior, and having an open end and a closed end located on opposite sides along its longitudinal axis. The filter media body of the primary filter element may have at least one coupling element at its open end for non-rotatably coupling to a coupling device of a secondary filter element.
[0017] During operation, the secondary filter element may be positioned inside the hollow of the primary filter element. The interface between the primary and secondary filter elements, i.e., the connecting element and connecting device, are positioned at the open ends of the primary and secondary filter elements, respectively. Beneficially, a polyurethane (PUR) ring can be positioned at the open end of the primary filter element.
[0018] According to a useful embodiment of the filter system, the coupling device for the secondary filter element comprises a socket including a threaded portion at the open end of the filter media body of the secondary filter element. In particular, the threaded portion may be a male thread. Alternatively or in addition thereto, in particular, the socket may protrude beyond the open end of the filter media body of the secondary filter element.
[0019] Advantageously, the sealing surface for the sealing element can be positioned in the socket of the coupling device, thereby sealing the clean side inside the secondary filter element against the unfiltered side of the filter element.
[0020] Advantageously, this interface for connecting to the housing can be arranged axially spaced from the interface to the primary filter element in a sleeve-shaped connecting device. The connecting element can be screwed, by means of a male thread, onto a complementary thread in the housing, particularly at the outlet socket for the filtered fluid. In this way, the secondary filter element can be stably connected to the housing, particularly non-rotatably. Alternatively, it is also possible to insert the secondary filter element into the housing, particularly into the outlet socket for the filtered fluid. In this case, a thread is not necessary.
[0021] According to an advantageous embodiment of the filter system, the connecting device comprises axially extending ribs, particularly on the outer wall surface, which are inclined with respect to the longitudinal axis, particularly in the direction of the closed end of the filter medium body of the secondary filter element. The ribs can advantageously prevent relative rotation between the primary filter element and the secondary filter element.
[0022] Alternatively or in addition thereto, the connecting device may have an axial recess, particularly on the outer wall surface. The axial recess can advantageously be designed to be complementary in shape to a projection on the inner circumference of the primary filter element.
[0023] According to an advantageous embodiment of the filter system, the ribs and / or the recesses are arranged adjacent to the outer wall surface of the filter medium body of the secondary filter element and / or overlap with the filter medium body of the secondary filter element with respect to the longitudinal axis.
[0024] According to an advantageous embodiment of the filter system, the connecting element of the secondary filter element has a groove into which the filter medium body is inserted. Advantageously, the groove can be located on the outer wall surface of the connecting element.
[0025] According to an advantageous embodiment of the filter system, the rib is provided outside the outer groove wall of the groove. Thereby, for example, a primary filter element having an elastic open end disk can be easily pushed axially beyond the outer groove wall. Alternatively or in addition, the axial recess may be provided outside the outer groove wall of the groove.
[0026] According to an advantageous embodiment of the filter system, at least one connecting element of the primary filter element projects radially inwardly with a radial component and has at least one projection configured to contact at least one of the axially extending ribs of the connecting device of the secondary filter element in order to effect a non-rotatable connection between the connecting element of the primary filter element and the connecting device of the secondary filter element. In this regard, the projection on the inner circumference of the primary filter element can engage with the axial recess in the connecting device of the secondary filter element to further improve the non-rotatable connection.
[0027] At least one connecting element of the primary filter element can be configured to be complementary in shape to at least one axial recess in the connecting device of the secondary filter element. Upon attachment, the at least one projection is inserted into the axial recess of the connecting device of the secondary filter element. If the connecting device of the secondary filter element comprises outwardly directed ribs, a beneficial non-rotatable connection can be formed. The at least one projection is preferably formed of PUR.
[0028] According to an advantageous embodiment of the filter system, the connecting elements of the primary filter element each project radially inwardly with a radial component and have at least two projections spaced circumferentially apart. Advantageously, a plurality of projections are arranged, for example, equidistantly from one another and can engage with corresponding axial recesses of the secondary filter element. In particular, the connecting elements of the primary filter element can be configured to be complementary in shape to at least one axial recess of the connecting device of the secondary filter element. In this regard, the projections on the inner circumference of the primary filter element can engage with the axial recesses in the connecting device of the secondary filter element to further improve the non-rotatable connection.
[0029] According to a beneficial embodiment of the filter system, the filter media body of the secondary filter element includes a folded filter media having an adsorbent. Alternatively, the filter media body of the secondary filter element may include a wound filter media having an adsorbent. For example, the adsorbent, preferably activated carbon, is introduced and fixed between two nonwoven fabric layers and then wound or folded. Optionally, the adsorbent may be provided as a filler between the nonwoven fabric layers.
[0030] According to a beneficial embodiment of the filter system, the filter media body of the secondary filter element has reinforcing elements, particularly a grid, on its outside and / or inside. This advantageously allows for horizontal installation of the filter element. The reinforcing elements can beneficially protect the surface of the secondary filter element from damage, for example, when replacing the primary filter element or when removing the primary filter element from the secondary filter element.
[0031] According to a beneficial embodiment of the filter system, an end disc is positioned at the closed end of the filter media body of the secondary filter element, and in particular, the end disc has a recess as an aid for mounting. The recess can help to apply the corresponding tool to unscrew or screw the secondary filter element into the housing.
[0032] According to a beneficial embodiment of the filter system, the housing is equipped with an outlet socket for particles. Particles such as dust separated by the primary filter element can be collected and removed through the outlet socket for particles.
[0033] According to a beneficial embodiment of the filter system, the outlet socket includes a closure element that opens and closes by weight. The closure element may be advantageously designed as a swivelable flap. When a certain amount of particles accumulate on the flap, the flap automatically opens, allowing the particles to fall out of the outlet socket. When the weight no longer exerts a load, the flap can be closed again. Alternatively, the closure element may be designed as a valve.
[0034] In a further aspect of the present invention, the use of a secondary filter element in a filter system is proposed, the secondary filter element comprising a filter medium body permeable to the fluid to be filtered, the filter medium body extending along a longitudinal axis, enclosing a hollow interior, and having an open end and a closed end located on opposite sides along the longitudinal axis. In this regard, the filter medium body of the secondary filter element comprises an adsorbent, in particular activated carbon. The secondary filter element is located inside the hollow interior of the primary filter element of the filter system, and the primary and secondary filter elements are sequentially passed through, at least temporarily, by the fluid to be filtered, in particular gaseous fluid, in particular air, during the operation of the filter system. The housing of the filter system comprises at least one coupling element at the fluid outlet for coupling to a coupling device located on the secondary filter element, the coupling device located at the open end of the filter medium body of the secondary filter element. In this regard, the secondary filter element is non-rotatably coupled to the primary filter element by the coupling device, and the threaded portion of the coupling element of the secondary filter element engages with the coupling element of the housing, which is configured as a threaded portion.
[0035] The secondary filter element is positioned downstream of the primary filter element with respect to the flow, and can provide additional protection to the clean side, for example, when the primary filter element is replaced or against substances that the primary filter element does not retain. Advantageously, the primary and secondary filter elements are interchangeable independently of each other. This allows for consideration of different loads on the primary and secondary filter elements, and thus avoids unnecessary replacement of either the primary or secondary filter element.
[0036] Advantageously, the secondary filter element may have an interface for connecting to the primary filter element and an interface for connecting to the housing of the filter system. This allows the secondary filter element to be advantageously non-rotatably mounted within the housing, even when significant mechanical loads and vibrations are acting on it during operation.
[0037] In a secondary filter element, the filter media itself contains an adsorbent, allowing it to remove most of the harmful gases that have passed through the primary filter element from the fluid. This is particularly useful when using a filter system in a system that includes components that are sensitive to harmful gases. Particularly advantageous is the use of a filter system with a secondary filter element in a fuel cell system to filter the cathode intake. Harmful gases can degrade or even destroy the membrane between the cathode and anode of a fuel cell.
[0038] Beneficially, the connecting element may be designed in a sleeve shape and have an interface for connecting to the secondary element and a separate interface for connecting to the housing. Beneficially, the connection to the primary filter element may be designed to be non-rotatable. This can further improve the operational safety of the filter system with the secondary filter element.
[0039] The secondary filter element can be connected to the filter housing, for example, by a threaded portion, which makes it possible to functionally upgrade existing filter systems that have conventional secondary filter elements without gas adsorption capabilities in a particularly simple manner.
[0040] Advantageously, at least one connecting element may be configured with a threaded portion complementary to the male threaded portion of the threaded socket of the connecting element. This allows for an advantageous non-rotatable connection between the secondary filter element and the housing. Alternatively, a simple plug-in connection may also exist.
[0041] According to a beneficial embodiment, the threaded portion of the connecting element of the secondary filter element is engageable with the connecting element of the housing, which is configured as a threaded portion, by rotating the primary filter element, and the rotational motion of the primary filter element is transmitted to the connecting device of the secondary filter element by the non-rotatable connection of the connecting device of the secondary filter element to the primary filter element.
[0042] Advantageously, the non-rotatable connection between the primary and secondary filter elements can, in this case, be used indirectly via the primary filter element to screw the secondary filter element into or out of the threaded portion on the housing side.
[0043] Another advantage can be derived from the following description of the drawings, which illustrate embodiments of the present invention. The drawings, specification, and claims contain a number of features in combination. Those skilled in the art can appropriately consider and combine these features, both individually and individually, to provide further combinations. These are illustrated below. [Brief explanation of the drawing]
[0044] [Figure 1] This is an isometric view of the housing of a filter system according to one embodiment of the present invention. [Figure 2] Figure 1 is a cross-sectional view of the filter system, including the interface. [Figure 3] Figure 1 is a cross-sectional view of one embodiment of the housing of the filter system. [Figure 4] Figure 2 is a detailed diagram of the interface between the primary filter element, secondary filter element, and housing of the filter system. [Figure 5] This is an isometric view of a quadratic filter element according to one embodiment of the present invention. [Figure 6] Figure 5 is a further isometric view of the quadratic filter element. [Figure 7] This is an isometric view of a primary filter element according to an embodiment of the present invention. [Figure 8] Figure 7 is a further isometric view of the first-order filter element. [Modes for carrying out the invention]
[0045] In the diagrams, identical or similar components are indicated by the same reference symbol. These diagrams are for illustrative purposes only and should not be understood as limiting.
[0046] To illustrate the present invention, Figures 1 to 4 show a filter system 100 according to one embodiment of the present invention. Figure 1 is an isometric view of the housing 110 of the filter system, and Figure 2 is a cross-sectional view of the filter system 100 according to Figure 1, including the interface between the secondary filter element 40 and the primary filter element 10, and the interface between the secondary filter element 40 and the housing 110. Figure 3 shows details of an outlet socket 140 for discharging particles from the housing 110.
[0047] A primary filter element 10 is located inside the housing 110, and a secondary filter element 40 is located inside its hollow interior 26. The secondary filter element 40 protects the unfiltered side of the filter system 100 when the primary filter element 10 is removed from the housing.
[0048] The housing 110 has a fluid inlet 112 and a fluid outlet 114, and during normal operation, a primary filter element 10 and a secondary filter element 40 are positioned between them in the direction of the flow of the fluid to be filtered, such as air.
[0049] In this embodiment, the fluid inlet 112 is tangentially positioned, so that the fluid flows into the housing 110 tangentially, allowing for pre-separation of particles, such as dust. The primary filter element 10 preferably includes a circumferential shroud 16 in the area of the fluid inlet 112 to protect the inflow of fluid.
[0050] In this example, the fluid outlet 114 is located in the center and guides the filtered fluid out of the filter system 100 via a socket 118.
[0051] In this example, the housing 110 is configured such that the primary filter element 10 and the secondary filter element 40 are arranged horizontally. This is a common installation configuration, for example, in a cathode air filter system for a fuel cell. A particle recovery chamber 130 is located in the lower region of the housing 110 (Figure 3), which can be discharged through an outlet socket 140. For this purpose, a closing device 150 in the form of a cap is pressed onto the outlet socket 140, which includes a closing element 152 that opens in response to weight and closes again, for example by spring force, after the recovery chamber 130 is empty. If the installation location of the filter system 100 differs from the specified location, the position of the outlet socket 140 can be appropriately selected accordingly.
[0052] Figure 4 is a detailed view of the interface between the primary filter element 10, the secondary filter element 40, and the housing 110 of the filter system 100 of Figure 2. Figures 5 and 6 show different views of the secondary filter element 40 according to one embodiment of the present invention, and Figures 7 and 8 show different views of the primary filter element 10 according to one embodiment of the present invention, respectively, in isometric view.
[0053] The fluid outlet 114 includes a connecting element 120 for connecting to a connecting device 70 located on the secondary filter element 40. In this embodiment, the connecting element 120 (Figure 4) is configured as a threaded portion 122 provided on the inner circumference of the fluid outlet 114, which is complementary to the male threaded portion 73 of the threaded socket 72 of the connecting element 70.
[0054] The secondary filter element 40 includes a filter media body 60 that is permeable to the fluid to be filtered, particularly gaseous fluids, especially air, the filter media body 60 extending along a longitudinal axis 200, enclosing a hollow interior 64, and having an open end 42 and a closed end 44 located on opposite sides along the longitudinal axis 200 (Figures 5 and 6). The filter media body 60 contains an adsorbent, particularly activated carbon.
[0055] The filter media body 60 may include a folded filter media having an adsorbent, or a wound filter media having an adsorbent. The filter media body 60 can adequately enclose the support pipe 90. Advantageously, the filter media body 60 may have reinforcing elements 62 configured, for example, as a grid, on its outer wall. This can be seen in the detailed view of Figure 4 and is shown in detail and symbolically in Figure 5. Of course, the outer wall may be completely surrounded by the reinforcing elements 62. The reinforcing elements 62 protect the filter media body 60 from damage, for example, during element replacement. Alternatively, the reinforcing elements 62 may be located inside the filter media body 60.
[0056] An end disc 50 is positioned at the closed end 44 of the filter media body 60, which includes a recess 54 with a radial notch for mounting assistance. If necessary, corresponding tools for mounting and removing the secondary filter element 40 can be applied.
[0057] The coupling device 70 is positioned at the open end 42 of the filter media body 60 and has interfaces to the housing 110 on one side and to the primary filter element 10 on the other. These are appropriately located outside the coupling device 70.
[0058] The coupling device 70 is designed in a sleeve shape. The filter media body 60 of the secondary filter element 40 is inserted into the circumferential groove 76 of the coupling element 70 together with the support tube 90, and is, for example, bonded or sealed therein. Outside the outer groove wall 78 of the groove 76, the coupling device 70 has an axial recess 80. Further outside the outer groove wall 78, there is an axially extending rib 82 that is inclined with respect to the longitudinal axis 200 toward the closed end 44. The outer groove wall 78, and in particular its axial recess 80, forms an interface to the primary filter element 10, as shown in Figure 4. The primary filter element 10 can be pushed onto the outside of the outer groove wall 78.
[0059] The axial recess 80 provided on the coupling device 70 of the secondary filter element 40 and the corresponding projection 24 provided on the primary filter element 10 also have the advantage of enabling identification (coding) of the primary filter element 10 and the secondary filter element 40.
[0060] The primary filter element 10 includes a filter media body 20 that is permeable to the fluid to be filtered, particularly gaseous fluids, especially air. The filter media body 20 extends along a longitudinal axis 200, encloses a hollow interior 26, and has an open end 12 and a closed end 14 located on opposite sides along the longitudinal axis 200 (Figures 7 and 8). At the open end 12, the primary filter element 10 includes an open end disc 34, particularly made of PUR. At the closed end 14, a closed end disc 30 or a cover is provided.
[0061] The filter media body 20 of the primary filter element 10 is provided with a plurality of connecting elements 38 extending circumferentially on its inner circumference at its open end 12 for connection to the connecting device 70 of the secondary filter element 40.
[0062] The connecting element 38 is designed as a projection 24 protruding into the interior 26, and its shape is designed to be complementary to the axial recess 80 provided in the connecting device 70 of the secondary filter element 40. The connecting element 38 is preferably an integral component of the open end disk 34. The recess 22 is arranged circumferentially on the outer circumference of the open end disk 34.
[0063] When the primary filter element 10 is pressed onto the coupling device 70 of the secondary filter element 40, the outer ribs 82 of the groove wall 78 of the coupling device 70 bite into the relatively elastic material of the open end disc 34, forming a non-rotatable connection to the coupling device 70. The recess on the outer circumference of the open end disc 34 further enhances the stability of the filter element 100 against undesirable rotation during operation.
[0064] The filter media body 20 of the primary filter element 10 can be wound or folded into a star shape, and a string coil for stabilization is provided around its outer circumference, as can be seen on the shroud 16 in Figures 7 and 8.
[0065] A spacer 32 is positioned to protrude axially from the closed end disk 30, which may preferably be formed of PUR.
[0066] Furthermore, the coupling device 70 for the secondary filter element 40 includes a threaded socket 72 at the open end 42 of the filter media body 60 of the secondary filter element 40 for connecting to the housing 110 of the filter system 100. The threaded socket 72 extends from the groove 76 to the opposite side in the direction of the longitudinal axis 200. The threaded socket 72 has a male threaded portion 73, which can be seen in particular in Figures 4 and 5. This allows the secondary filter element 40 to be screwed into and unscrewed from the socket 118 of the fluid outlet 114. This also improves the non-rotatable position of the secondary filter element 40 during the operation of the filter system 100.
[0067] The secondary filter element 40 can, in this way, be directly connected to the filter housing 110 by the threaded portion 73, thereby enabling the functional retrofitting of existing filter systems, particularly those having conventional secondary filter elements that do not possess gas adsorption capabilities, in a simple manner. Advantageously, the non-rotatable connection between the primary filter element 10 and the secondary filter element 40 can, in this case, be used indirectly via the primary filter element 10 to screw the secondary filter element 40 into or out of the threaded portion 122 on the housing side.
[0068] Alternatively, a simple plug-in embodiment without threads is also possible (not shown).
[0069] As shown in Figure 4, a seal ring 74 is positioned between the threaded portion 73 and the groove 76 of the threaded socket 72 of the connecting device 70. This allows for a sealing action between the clean side and the unfiltered side of the filter system 100, especially when the primary filter element 10 is withdrawn from the secondary filter element 40. [Explanation of symbols]
[0070] 10 Primary filter elements 12 Open end 14 Closed end 16 Shroud 20 Filter media body 22 recess 24 protrusions 26 Internal 30 Closed End Disks 32 Support elements 34 Open End Disc 36 stickers 38 Connecting elements 40 Secondary filter elements 42 Open end 44 Closed end 50 End Discs 52 Notches 54. Indentation 60 filter media body 62 Reinforcement elements 64 Internal 70 Coupling device 72 Threaded Sockets 73 Threaded part 74 stickers 76 Groove 78 Outer groove wall 80 recess 82 Ribs 90 Support tube 100 filter systems 110 Housing 112 Fluid inlet 114 Fluid outlet 118 sockets 120 connecting elements 122 Threaded part 130 Collection Room 140 Outlet Socket 150 Closure device 152 Closure elements 200 Longitudinal axis
Claims
1. A filter system (100) comprising a housing (110) having a fluid inlet (112) and a fluid outlet (114), At least one primary filter element (10) and one secondary filter element (40) are arranged within the housing (110) between the fluid inlet (112) and the fluid outlet (114), the secondary filter element (40) is arranged inside the hollow interior (26) of the primary filter element (10), and the primary filter element (10) and the secondary filter element (40) are at least temporarily sequentially flowable by the fluid to be filtered, in particular gaseous fluid, in particular air. The housing (110) is provided with at least one connecting element (120) at the fluid outlet (114) for connecting to a connecting device (70) arranged on the secondary filter element (40), The secondary filter element (40) is a filter medium body (60) that is permeable to the fluid to be filtered, and includes a filter medium body (60) that extends along a longitudinal axis (200), surrounds a hollow interior (64), and has an open end (42) and a closed end (44) located on opposite sides along the longitudinal axis (200), The filter media body (60) of the secondary filter element (40) contains an adsorbent, particularly activated carbon. The connecting device (70) is positioned at the open end (42) of the filter media body (60) of the secondary filter element (40). The filter system (100) is characterized in that the coupling device (70) is configured to be non-rotatably coupled to the primary filter element (10), at least one coupling element (120) of the housing (110) is configured as a threaded portion (122) and is complementary to the threaded portion (73) of the coupling element (70) of the secondary filter element (40), and the threaded portion (73) of the coupling element (70) of the secondary filter element (40) is engageable with the threaded portion (122) of the coupling element (120) of the housing (110).
2. The primary filter element (10) is a filter medium body (20) that is permeable to the fluid to be filtered, and includes a filter medium body (20) that extends along a longitudinal axis (200), surrounds the hollow interior (26), and has an open end (12) and a closed end (14) located on opposite sides along the longitudinal axis (200), The filter system according to claim 1, wherein the filter media body (20) of the primary filter element (10) is provided with at least one connecting element (38) at the open end (12) for non-rotatably connecting to the connecting device (70) of the secondary filter element (40).
3. The filter system according to claim 1 or 2, wherein the connecting device (70) of the secondary filter element (40) comprises a socket (72) having a threaded portion (73) at the open end (42) of the filter media body (60) of the secondary filter element (40), wherein the threaded portion (73) is a male threaded portion, and / or the socket (72) protrudes beyond the open end (42) of the filter media body (60) of the secondary filter element (40).
4. The filter system according to claim 3, wherein the connecting device (70) is provided with axially extending ribs (82), particularly on the outer wall surface, and the axially extending ribs (82) are inclined with respect to the longitudinal axis (200), particularly in the direction of the closed end (44) of the filter material body (60) of the secondary filter element (40), and / or the connecting device (70) is provided with axial recesses (80), particularly on the outer wall surface.
5. The filter system according to claim 4, wherein the ribs (82) and / or recesses (80) are positioned adjacent to the outer wall surface of the filter media body (60) of the secondary filter element (40) and / or overlap with the filter media body (60) of the secondary filter element (40) with respect to the longitudinal axis (200).
6. The filter system according to any one of claims 1 to 5, wherein the connecting element (70) of the secondary filter element (40) has a groove (76) into which the filter media body (60) is inserted.
7. The filter system according to claim 6, wherein the rib (82) is located outside the outer groove wall (78) of the groove (76), and / or the axial recess (80) is located outside the outer groove wall (78) of the groove (76).
8. The filter system according to any one of claims 4 to 7, wherein the at least one connecting element (38) of the primary filter element (10) has at least one projection (24) projecting radially into the interior (26), the projection (24) being configured to contact at least one of the axially extending ribs (82) of the connecting device (70) of the secondary filter element (40) to provide a non-rotatable connection between the connecting element (38) of the primary filter element (10) and the connecting device (70) of the secondary filter element (40).
9. The filter system according to claim 8, wherein the connecting element (38) of the primary filter element (10) has at least two projections (24) that protrude radially into the interior (26) and are spaced apart in the circumferential direction, and in particular, the connecting element (38) of the primary filter element (10) is configured to have a shape complementary to at least one axial recess (80) of the connecting device (70) of the secondary filter element (40).
10. The filter system according to any one of claims 1 to 9, wherein the filter media body (60) of the secondary filter element (40) includes a folded filter media having an adsorbent, or the filter media body (60) of the secondary filter element (40) includes a wound filter media having an adsorbent.
11. The filter system according to any one of claims 1 to 10, wherein the filter media body (60) of the secondary filter element (40) has a reinforcing element (62), particularly a grid, on its outside and / or inside.
12. The filter system according to any one of claims 1 to 11, wherein an end disc (50) is positioned at the closed end (44) of the filter media body (60) of the secondary filter element (40), and in particular, the end disc (50) has a recess (54) as an aid for mounting.
13. The filter system according to any one of claims 1 to 12, wherein the housing (110) comprises an outlet socket (140) for particles.
14. The filter system according to claim 13, wherein the outlet socket (140) includes a closing element (150) that opens and closes by weight, and in particular, the closing element (150) is configured as a swivelable flap or a valve.
15. The use of a secondary filter element (40) in a filter system (100) according to any one of claims 1 to 14, The secondary filter element (40) is a filter medium body (60) that is permeable to the fluid to be filtered, and includes a filter medium body (60) that extends along a longitudinal axis (200), surrounds a hollow interior (64), and has an open end (42) and a closed end (44) located on opposite sides along the longitudinal axis (200), The filter media body (60) of the secondary filter element (40) contains an adsorbent, particularly activated carbon. The secondary filter element (40) is located inside the hollow interior (26) of the primary filter element (10) of the filter system (100), and the primary filter element (10) and the secondary filter element (40) are sequentially passed through, at least temporarily, by the fluid to be filtered, particularly gaseous fluid, particularly air, during the operation of the filter system (100). The housing (110) of the filter system (100) is provided at the fluid outlet (114) with at least one connecting element (120) for connecting to a connecting device (70) arranged on the secondary filter element (40), The connecting device (70) is positioned at the open end (42) of the filter media body (60) of the secondary filter element (40). The secondary filter element (40) is non-rotatably connected to the primary filter element (10) by the coupling device (70). The threaded portion (73) of the connecting element (70) of the secondary filter element (40) is used to engage with the connecting element (120) of the housing (110), which is configured as a threaded portion (122).
16. The use according to claim 15, wherein the threaded portion (73) of the connecting element (70) of the secondary filter element (40) is engageable with the connecting element (120) of the housing (110), which is configured as a threaded portion (122), by rotating the primary filter element (10), and the rotational motion of the primary filter element (10) is transmitted to the connecting device (70) of the secondary filter element (40) by the non-rotatable connection of the connecting device (70) of the secondary filter element (40) to the primary filter element (10).