Filter cartridge for protective breathing masks

Abstract

The invention relates to a filter cartridge (10) for protective breathing masks, comprising a housing (11) with an air inlet cross-section (12), a base (13) and an air outlet opening (14, 214) in the base (13); a gas filter element (15); and a particle filter element (16); wherein the housing (11) has a lattice (17, 117) at a distance from the base (13), said lattice having a plurality of lattice intersection points (118); the gas filter element (15) is located between the base (13) and the lattice (17, 117), and the particle filter element (16) is located between the air inlet cross-section (12) and the lattice (17, 117); a first nonwoven fabric (29) is provided between the lattice (17, 117) and the gas filter element (15), and a second nonwoven fabric (30) is provided between the gas filter element (15) and the base (13, 213); and the ratio of the distance (h1) between the air outlet opening (14, 214) and the second nonwoven fabric (30) to the distance (h2) between the second nonwoven fabric (30) and the first nonwoven fabric (29) is at least 0.75, in particular at least 0.80, in particular at least 0.85.

Description

[0001] Filter cartridge for respiratory masks

[0002] The invention relates to a filter cartridge for respiratory masks, a respiratory mask with a filter cartridge and a use of a particle filter element in such a filter cartridge.

[0003] Filter cartridges for respiratory masks are generally known in the art and are used, for example, in painting work. The purpose of these filter cartridges is to protect the wearer from harmful substances, such as particles and / or organic vapors, in the air when inhaled. The filter cartridges typically have several layers of different filter elements. During operation, i.e., when air laden with harmful substances is inhaled, the filter elements become clogged with the harmful substances, such as particles.

[0004] In this context, it has now become apparent that there is a further need to provide a filter cartridge, in particular there is a need to provide a filter cartridge with more efficient operation and longer service life of the subcomponents as well as with improved air flow.

[0005] These and other objects, which will be mentioned upon reading the following description or which may be recognized by a person skilled in the art, are achieved by the subject matter of the independent claims. The dependent claims further develop the central idea of ​​the present invention.

[0006] According to a first aspect of the present invention, a filter cartridge for respiratory masks is provided, comprising: a housing with an air inlet cross-section, a base, and an air outlet opening arranged in the base; a gas filter element; a particle filter element; wherein the housing has a grid with a plurality of grid intersection points at a distance from the base; wherein the gas filter element is arranged between the base and the grid, and the particle filter element is arranged between the air inlet cross-section and the grid; wherein a first fleece is arranged between the grid and the gas filter element, and a second fleece is arranged between the gas filter element and the base; wherein the ratio of a distance between the air outlet opening and the second fleece to a distance between the second fleece and the first fleece is at least 0.75, in particular at least 0.80, in particular at least 0.85.

[0007] The term "filter cartridge" refers specifically to a device for filtering air as it flows through the filter cartridge. The air flows from the outside or unfiltered into a first side, the so-called air inlet cross-section, into the filter cartridge. The air flows through the filter cartridge and flows out of a second side, the so-called air outlet opening. Furthermore, the air can be forced through the filter cartridge by pressure or negative pressure. For example, the negative pressure can be created by suction, in particular by suction by a person wearing the respirator.

[0008] The term "filtering" specifically refers to the removal or extraction of harmful substances, such as particles and / or organic vapors, from unfiltered air. Furthermore, the term "filtering" can also be understood as the purification of unfiltered air.

[0009] The term "respiratory mask" refers in particular to a device that can be designed to be worn by a person and that filters the air that the person inhales and / or breathes while worn. The respiratory mask can be designed to accommodate at least one filter cartridge to filter the air drawn in by the person. Furthermore, the respiratory mask can be designed such that the respiratory mask, for example, at least partially or completely encloses the person's face, but in particular encloses the person's mouth and nose.

[0010] The term "enclose" specifically means that the respirator is designed in such a way that enclosed body parts, such as the face, mouth, and / or nose, are supplied with filtered air. In particular, the respirator encloses the enclosed body parts, in particular the face, mouth, and / or nose, in an airtight manner, i.e., the respirator fits so tightly against the person's face that no, or as little, air can escape between the contact surfaces. In particular, the respirator is a half mask.

[0011] The term "housing" refers in particular to a geometric body, whereby the housing can be designed, for example, as a first filter cartridge element of the filter cartridge. Furthermore, the housing can have locking lugs. The housing serves to arrange subcomponents of the filter cartridge. The housing can be constructed in one piece or in multiple pieces. In particular, the housing has a largely non-circular cross-section. In particular, the housing has a hexagonal and six-sided cross-section. In particular, the corners of the housing are rounded.

[0012] The term "base" refers in particular to a geometric body, whereby the base can be designed, for example, as a second filter cartridge element of the filter cartridge. Furthermore, the base can have corresponding locking lugs on the housing to create a locking connection between the housing and the base.

[0013] For example, when the housing is locked to the base, the housing and the base may form the body of the filter cartridge and be configured to receive or arrange at least the gas filter element, the particulate filter element and the grid within the housing and the base.

[0014] Preferably, the bottom and side walls of the housing are formed in one piece.

[0015] The term "air inlet cross-section" refers in particular to an opening in the housing that is designed to allow air to flow into the housing. For example, at least part of one side of the housing can have the air inlet cross-section.

[0016] For example, the air inlet cross-section may have an area greater than half the area of ​​one of the sides of the housing. The air inlet cross-section is above the

[0017] Particle filter element. In particular, the air inlet cross-section is located in a frame or cover of the filter cartridge or in a frame or cover of the filter cartridge housing. The frame or cover is preferably designed as a separate part that can be connected to the rest of the filter cartridge housing.

[0018] The term "air outlet opening" refers in particular to an opening in the base designed to allow air to flow out of the housing. For example, at least part of one side of the base can have the air outlet opening. For example, the air outlet opening can have a circular surface. The air outlet opening can further be provided with a valve for opening and closing. Preferably, the air outlet opening is located away from the center of a long side of the base. Preferably, the air outlet opening is located in the center of a short side of the base.

[0019] The term "gas filter element" refers in particular to a filter element designed such that gases and / or vapors, or harmful substances in gases and / or vapors, can be released, absorbed, and / or adsorbed in the unfiltered air. The gas filter element can, for example, comprise activated carbon elements at least in part. In particular, the gas filter element can comprise activated carbon granules and / or a bed of activated carbon and / or compressed activated carbon granules and / or compressed activated carbon granules. In particular, the filter element is designed such that it can filter organic gases and vapors, for example from solvent-based paints, adhesives, and cleaning agents, from the air. In particular, the filter is an A2 filter. In particular, the filter can be a combination of an adsorption filter and an absorption filter.

[0020] The term "particle filter element" refers in particular to a filter element designed such that particles in the unfiltered air can be captured by the particle filter element as they flow through the particle filter element and / or can be captured by the particle filter element as they flow along the particle filter element. In particular, the particle filter element is designed as a flat filter. In particular, the particle filter element is designed as a non-pleated filter. In particular, the particle filter element is designed as a fine filter. In particular, the particle filter element is glued and / or welded to a grid and / or to a housing. In particular, the particle filter element is designed to be replaceable.

[0021] The filter cartridge can have multiple particle filter elements and / or multiple gas filter elements. The multiple particle filter elements can be configured similarly or differently. The multiple gas filter elements can be configured similarly or differently. The filter cartridge can have other types of filter elements. The filter cartridge can have a pre-filter element. The pre-filter element can be arranged upstream of the particle filter element, in particular in the main flow direction described below, in order to protect the particle filter element from coarser contaminants. The pre-filter element can be designed to be replaceable.

[0022] The term "grid" refers in particular to a device designed to support the particle filter element. Furthermore, the grid can be configured to spatially fix the gas filter element. Furthermore, the grid can be arranged detachably or non-detachably inside the housing. In particular, the grid is glued to the housing and / or ultrasonically welded and / or connected by means of a force-fitting and / or form-fitting connection. In particular, the grid is plugged onto the housing. In particular, an edge of the grid encompasses an upper edge of the housing. In particular, a sealing element is arranged between the grid and the housing.

[0023] The term “grid intersection point” refers in particular to a position within the grid at which a first grid strut of the grid and a second grid strut of the grid intersect. For example, the first grid strut can run from a first side of the grid to a third side of the grid and the second grid strut can run from a second side of the grid to a fourth side of the grid. The term “fleece” refers in particular to air-permeable fabric that is designed to prevent the gas filter element from disintegrating. The fleece serves as a boundary for the gas filter element and is intended to prevent individual particles (e.g. activated carbon particles) from being carried along by the air flow. The fleece can also have a further filtering function. The term “fleece” can in particular mean a fleece in the true sense of the word. The term “fleece” can in particular mean a fabric produced by weaving, knitting, or in another way by crossing orA fabric made by interlacing yarns. The yarn can be made of a natural material and / or synthetic fibers.

[0024] This increases the stability of the gas filter element and also enhances user safety.

[0025] The term “distance” refers in particular to the shortest distance, especially in the main flow direction, between the components mentioned.

[0026] Preferably, the distance between the air outlet opening and the second fleece is constant. In particular, the air outlet opening and the second fleece are arranged parallel to one another. In particular, the opening area of ​​the air outlet opening is arranged parallel to the second fleece. In particular, the outermost collar delimiting the air outlet opening is decisive for determining the distance between the air outlet opening and the second fleece. In particular, the underside of the fleece is decisive for determining the distance between the air outlet opening and the second fleece.

[0027] Preferably, the distance between the second nonwoven fabric and the first nonwoven fabric is constant. In particular, the second nonwoven fabric and the first nonwoven fabric are arranged parallel to one another. In particular, the top side of the second nonwoven fabric is decisive for determining the distance between the second nonwoven fabric and the first nonwoven fabric. In particular, the underside of the first nonwoven fabric is decisive for determining the distance between the second nonwoven fabric and the first nonwoven fabric. In particular, the distance between the second nonwoven fabric and the first nonwoven fabric is equal to the extension of the gas filter element in the main flow direction.

[0028] The ratio of a distance h1 to a distance h2 is calculated by h1 divided by h2.

[0029] According to one embodiment, at least a subset of the grid intersection points each has an elevation, so that a free space for air exchange transversely to a main flow direction is created between the gas filter element and the particle filter element between individual regions of the grid.

[0030] The term "main flow direction" refers in particular to the direction of flow of unfiltered air through the filter cartridge. The main flow direction can, for example, run from the air inlet cross-section through the particulate filter element and the gas filter element to the air outlet opening. In particular, the main flow direction is an ideal main flow direction. In particular, the main flow direction extends perpendicular to the particulate filter element and / or perpendicular to the gas filter element.

[0031] The term "elevation" refers in particular to a geometric change in the shape of the grid intersection points in a direction orthogonal to a base area of ​​the grid. Furthermore, the elevation can be formed, for example, from the grid intersection points toward the gas filter element and / or the particulate filter element. Furthermore, the elevation can be designed such that the particulate filter element and / or the gas filter element can be supported and / or fixed at a distance from the grid.

[0032] The term “area in the grid” refers in particular to the opening or mesh between the individual grid points.

[0033] The invention is based on the finding that the particle filter elements become unevenly clogged with particles during operation. This causes an uneven opening area in the main flow direction. This has a negative impact on the filtration in the particle filter element and also in the downstream gas filter element, since the gas filter element is mainly subjected to flow in areas located below areas in the particle filter element that are not yet clogged. This makes inhalation more difficult overall because the flow resistance is increased. The possible flow-through area within the gas filter becomes increasingly smaller as the separation of particles increases. The invention solves this problem by increasing the distance between the air outlet opening and the second fleece compared to the prior art.The distance is at least 0.75 times, in particular at least 0.80 times, in particular at least 0.85 times, the distance between the second nonwoven fabric and the first nonwoven fabric. In particular, the distance between the second nonwoven fabric and the first nonwoven fabric is equal to the extension of the gas filter element in the main flow direction. In particular, the distance between the second nonwoven fabric and the first nonwoven fabric is equal to the height or thickness of the gas filter element.

[0034] The increased distance between the air outlet and the second fleece allows for more even airflow through the filter elements. This allows for a large and evenly distributed flow to and through the gas filter element. This has an overall positive effect on the operation and efficiency of the breathing mask. Furthermore, the service life of the gas filter element and / or the particle filter element can be increased.

[0035] According to one embodiment, the ratio of the distance between the air outlet opening and the second fleece to the distance between the second fleece and the first fleece is less than 1.2, in particular less than 1.0. This enables a compact design of the filter cartridge.

[0036] According to one embodiment, at least a subset of the grid intersection points each has an elevation, so that a free space for air exchange transversely to a main flow direction is created between the gas filter element and the particle filter element between individual regions of the grid.

[0037] The raised sections create a gap between them. This gap allows for air exchange between the individual sections of the grille.

[0038] In filter cartridges according to the state of the art, there is no air exchange between individual areas of the grid without elevations perpendicular to the main flow direction.

[0039] According to one embodiment, the elevation can be arranged between the grid and the particle filter element.

[0040] The particle filter element in particular rests on the grid intersection points where elevations are provided.

[0041] In this way, the elevations allow airflow between the gas filter element and the particulate filter element. Furthermore, the elevations can be used to control the airflow in such a way that, for example, airflow around the gas filter element and the particulate filter element is favored.

[0042] According to one embodiment, the housing may have first air guiding ribs on the bottom aligned with the air outlet opening.

[0043] The term "first air guide ribs" refers in particular to a device designed to guide an air flow from the gas filter element to the air outlet opening. The first air guide ribs can form chambers, wherein the chambers divide the space between the gas filter element and the air outlet opening.

[0044] In this way, an air flow can be guided from the gas filter element to the air outlet opening. Furthermore, the air flow can be controlled by means of the first air guide ribs in such a way that, for example, the flow of air flowing from the gas filter element to the air outlet opening is improved.

[0045] Preferably, the second fleece rests on the first air-guiding ribs. This allows the fleece and / or the gas filter element to be supported by the first air-guiding ribs.

[0046] In particular, the first air guide ribs extend perpendicular to the bottom of the housing or the filter cartridge. In particular, the first air guide ribs extend opposite to the main flow direction described above.

[0047] According to one embodiment, the first air guiding ribs may have one or more recesses for air exchange of areas between the first air guiding ribs.

[0048] The term "recess" refers, in particular, to an opening between a first region between the first air-guiding ribs and a second region between the first air-guiding ribs. The recesses can be arranged on a side facing or away from the gas filter element, or within the air-guiding ribs. In particular, the recesses are arranged on a side facing the gas filter element.

[0049] In this way, the air flow can be suitably directed, for example, from the first of the formed regions to the second of the formed regions, so that the air flow can flow evenly within the regions between the first air guide ribs. This leads to more efficient operation of the filter cartridge because flow resistance is reduced.

[0050] According to one embodiment, an umbrella valve can be arranged in the air outlet opening such that the umbrella valve at least partially opens the air outlet opening when inhaling and the umbrella valve closes the air outlet opening when exhaling.

[0051] The term "umbrella valve" refers in particular to a valve device that, for example, allows air flow from a first side of the umbrella valve to a second side of the umbrella valve and blocks air flow from the second side to the first side. Furthermore, the umbrella valve can, for example, have a shield made of an elastomer and be designed to allow and block air flow.

[0052] This allows filtered air to be drawn in from the filter cartridge when a person inhales. It also prevents exhaled air from flowing back into the filter cartridge when a person exhales. This could lead to a deterioration of the inhaled air.

[0053] According to one embodiment, second air guide ribs can be arranged in the air outlet opening.

[0054] In this way, an air flow from the gas filter element to the air outlet opening can be further improved, so that, for example, a flow of air through the filter cartridge is improved and breathing is made easier for a person wearing the respirator with the filter cartridge.

[0055] According to one embodiment, the second air guiding ribs may have recesses for air exchange of areas between the second air guiding ribs.

[0056] The peak of the umbrella valve does not open evenly when inhaling, particularly with an umbrella valve of this design, so that parts of the air outlet opening are not exposed. The peak lifts off from the air outlet opening in a wavy manner rather than parallel to the air outlet opening when inhaling. The second air ribs arranged in the air outlet opening, in turn, define areas. Without the recesses, no or only a small air flow from some areas could flow through the air outlet opening with this unevenly opened peak, as the peak would still rest at least partially on these areas. The recesses allow air to exchange between the individual areas between the second air guide ribs.

[0057] This allows for a better distribution of the airflow within the outlet opening. This reduces flow resistance, resulting in improved and easier inhalation.

[0058] According to one embodiment, the recesses can be arranged in the second air guide ribs on a side facing the umbrella valve. In this way, an air flow from the gas filter element to the air outlet opening can be distributed in an improved manner between the regions of the second air guide ribs before reaching the umbrella.

[0059] According to one embodiment, at least one air guide rib of the first air guide ribs and at least one air guide rib of the second air guide ribs can be designed as a single piece.

[0060] In this way, regions can be formed between the first air guide ribs and the second air guide ribs which improve the guidance of the air flow from the gas filter element to the air outlet opening, since the air flow is guided to the air outlet opening without interruption.

[0061] According to one embodiment, a screen of the screen valve can be designed such that it lifts unevenly from the air outlet opening during inhalation.

[0062] The canopy of the canopy valve is made of an elastomer. It exhibits particularly high elasticity and flexibility. Depending on the intake situation, the canopy does not deform evenly during inhalation. Some parts of the canopy are lifted, while others remain on the air outlet opening.

[0063] According to one embodiment, the housing may have a frame element for fastening the particle filter element.

[0064] The term “frame element” refers in particular to a device designed to arrange the particle filter element on the housing. Alternatively or additionally, the term “frame element” can refer to a device designed to protect the particle filter element, in particular from mechanical influences. The term “frame element” can refer in particular to a device designed to arrange a pre-filter element on the housing. The term “frame element” can refer to a cover for the filter cartridge and / or for the housing. The frame element can be part of the housing. The frame element can be a separate part. The frame element can serve as a border for the particle filter element. The frame element can have an air inlet cross-section. One edge of the frame element can be designed such that it at least partially encompasses one edge of the grille. One edge of the frame element can be designed as a locking element.One edge of the grid can be designed as a locking counter element. The grid and frame element can be designed such that they form a locking connection for arranging the frame element on the filter cartridge. The frame element can be detachably or permanently connected to the filter cartridge.

[0065] The frame element can in particular increase the stability of the arrangement of the particle filter element.

[0066] According to one embodiment, the filter cartridge may further comprise an interface for attaching it to a respiratory mask.

[0067] The term "interface" refers in particular to a device for positively connecting the filter cartridge to the respirator mask, wherein the interface is designed such that it can be connected to a receiving point of the respirator mask. Furthermore, the interface can comprise a snap connection, screw device, spring device, bayonet device, and / or locking device designed for connection to the receiving point. In particular, the interface can comprise a locking device.

[0068] This allows the filter cartridge to be easily connected to the respirator mask, allowing for quick replacement or swapping of the filter cartridge.

[0069] Another aspect concerns a respirator mask with a disclosed filter cartridge.

[0070] A further aspect relates to a use of a particle filter element in a disclosed filter cartridge.

[0071] The features described above, including those from different embodiments, can also be combined with each other, resulting in synergistic interactions that go beyond the sum of the individual effects.

[0072] The invention is explained below using exemplary embodiments, which are described with reference to the following figures:

[0073] Figure 1 shows a sectional view of an exemplary embodiment of a filter cartridge according to the invention;

[0074] Figure 2 shows a view of an exemplary embodiment of a grid of a filter cartridge according to the invention; Figure 3 shows a view of an exemplary embodiment of a housing of a filter cartridge according to the invention; and

[0075] Figure 4 shows a view of an exemplary embodiment of an umbrella valve of a filter cartridge according to the invention.

[0076] Exemplary embodiments are described and explained below with reference to the figures listed above. Like reference symbols or analogous reference symbol structures refer to analogous or interacting components.

[0077] Figure 1 shows a sectional view of an exemplary embodiment of a filter cartridge 10. The filter cartridge 10 is designed to be connected to a respiratory mask. For this purpose, the filter cartridge 10 has an interface 50 designed as a snap-in connection. In this case, the filter cartridge 10 has a housing 11 with an air inlet cross-section 12. A particle filter element 16 is arranged below the air inlet cross-section 12. The particle filter element 16 is mounted on a grid 17. In this case, the particle filter element 16 is glued and / or ultrasonically welded to an edge of the grid 17. One edge of the grid 17 engages around an upper edge of the housing 11. The housing 11 also has a frame element 31 for further fastening and / or protecting the particle filter element 16. Alternatively, the particle filter element 16 could also be arranged in the housing via a fit.One edge of the frame element 31 has a locking element 32 that engages with a locking counter-element 18 formed by an edge of the grid 17. A first fleece 29 is arranged below the grid 17. A gas filter element 15 is arranged below the first fleece 29. The gas filter element 15 is an activated carbon filter. A second fleece 30 is arranged below the gas filter element 15. A base 13 with an air outlet opening 14 arranged therein is arranged below the second fleece 30. An umbrella valve 25 is also arranged in the air outlet opening 14. The air outlet opening 14 and the second fleece 30 are spaced apart by a distance h1. The second fleece 30 and the first fleece 29 are spaced apart by a distance h2. The ratio between distance h1 and distance h2 is approximately 0.8 in the present case.

[0078] Figure 2 shows a plan view of an exemplary grid 117 of a filter cartridge according to the invention. In this case, the grid has a plurality of grid intersection points 118. The grid intersection points 118 each have a raised portion 119. The particle filter element (not shown) is arranged on these raised portions 119. These raised portions 119 create a free space 120 between the particle filter element and the grid 117. The free space 120 allows air to flow between the individual regions 121 transversely to the main flow direction of the grid 117. This is advantageous if the particle filter element is partially blocked in such a way that no air can flow in the main flow direction. This allows for a better flow distribution within the filter cartridge, since the air can flow transversely to the main flow direction even when the particle filter element is blocked.Alternatively, the elevations could also be arranged on the side facing away from the falling particle filter element.

[0079] Figure 3 shows an exemplary view of a housing 211 of a filter cartridge according to the invention. The bottom 213 of the housing is arranged in the lower region of the housing 211. The bottom 213 here also has an air outlet opening 214. Furthermore, first air guide ribs 222 are arranged in the bottom 213. The first air guide ribs 222 run radially to the air outlet opening 214. The first air guide ribs 222 have a plurality of recesses 223. The recesses 223 serve for air exchange between the regions 224 between the first air guide ribs 222. Furthermore, second air guide ribs 226 are arranged in the air outlet opening 214. The air guide ribs 226 also converge radially in the air outlet opening 214. In the present case, the second air guide ribs 226 and at least some of the first air guide ribs 222 are designed as a single piece.The second air guide ribs 226 have recesses 227 that allow air to exchange between regions 233 between the second air guide ribs 226. The recesses 227 are arranged on the side facing the umbrella valve (not shown). The recesses accommodate the fact that the umbrella valve is not raised evenly during breathing, but rather in a wave-like manner, so that individual regions 233 are not exposed by the umbrella valve. The recesses 227 allow air to exchange between the regions 233, so that air can flow between regions 233 not exposed by the umbrella valve and regions 233 exposed by the umbrella valve. The outlet opening 214 has a receptacle 232 for the umbrella valve (not shown) in its center.

[0080] Figure 4 shows a view of an exemplary embodiment of an umbrella valve 325 of a filter cartridge according to the invention. The umbrella valve 325 has a shield 328. The umbrella valve 328 also has a pin 340 in the center for mounting in the receptacle 232 of the outlet opening 214. The pin 340 is inserted into the opening of the receptacle 232 on the outside of the housing 211 until the tip of the head of the pin 340 protrudes from the opening of the receptacle 232 on the inside of the housing 211. The head of the pin 340 is then completely pulled out of the receptacle 232 and then released, so that the undercut of the head of the pin 340 rests on the inner end face of the receptacle 232 and holds the umbrella valve 325 in the receptacle 232. The umbrella valve 325 is made of an elastomer, for example EPDM.

[0081] Reference symbol

[0082] 10 filter cartridges

[0083] 11, 211 Housing

[0084] 12 Air inlet cross-section

[0085] 13, 213 floor

[0086] 14, 214 Air outlet opening

[0087] 15 Gas filter element

[0088] 16 Particle filter element

[0089] 17, 117 grids

[0090] 18 Locking counter element

[0091] 25, 325 umbrella valve

[0092] 29 first fleece

[0093] 30 second fleece

[0094] 31 frame element

[0095] 32 locking element

[0096] 50 Interface for mask

[0097] 118 Grid intersection point

[0098] 119 Survey

[0099] 120 free space

[0100] 121 areas grid

[0101] 222 first air guide rib floor

[0102] 223 Recess air guide rib floor

[0103] 224 Areas between air guide ribs floor

[0104] 226 second air guide rib air outlet opening

[0105] 227 Recess second air guide rib air outlet opening

[0106] 232 Umbrella valve holder

[0107] 233 Areas between second air guide ribs air outlet opening

[0108] 328 umbrella

[0109] 340 Pin umbrella valve h1 Distance between air outlet opening and second fleece h2 Distance between first and second fleece

Claims

Claims 1. A filter cartridge (10) for respiratory masks, comprising: a housing (11) with an air inlet cross-section (12), a base (13), and an air outlet opening (14, 214) arranged in the base (13); a gas filter element (15); a particle filter element (16); wherein the housing (11) has a grid (17, 117) with a plurality of grid intersection points (118) spaced from the base (13); wherein the gas filter element (15) is arranged between the base (13) and the grid (117), and the particle filter element (16) is arranged between the air inlet cross-section (12) and the grid (117); wherein a first fleece (29) is arranged between the grid (17, 117) and the gas filter element (15), and a second fleece (30) is arranged between the gas filter element (15) and the base (13, 213);wherein the ratio of a distance (h1) between the air outlet opening (14, 214) and the second fleece (30) and a distance (h2) between the second fleece (30) and the first fleece (29) is at least 0.75, in particular at least 0.80, in particular at least 0.85; 2. Filter cartridge (10) according to claim 1, wherein the ratio of the distance between the air outlet opening (14, 214) and the second fleece (30) and the distance between the second fleece (30) and the first fleece (29) is less than 1.2, in particular less than 1.

0.

3. Filter cartridge (10) according to claim 1 or 2, wherein at least a subset of the grid intersection points (118) each has a raised portion (119), so that a free space (120) for air exchange transverse to a main flow direction between individual regions (121) of the grid (17, 117) is created between the gas filter element (15) and the particle filter element (16).

4. Filter cartridge (10) according to claim 3, wherein the elevation (119) is arranged between the grid (117) and the particle filter element (16).

5. Filter cartridge (10) according to one of the preceding claims, wherein the housing (11, 211) has first air guiding ribs (222) on the bottom (13, 213) aligned with the air outlet opening (14, 214).

6. Filter cartridge (10) according to claim 5, wherein the first air guide ribs (222) have one or more recesses (223) for air exchange of regions (224) between the first air guide ribs (222).

7. Filter cartridge (10) according to one of the preceding claims, wherein an umbrella valve (25, 325) is arranged in the air outlet opening (14, 214) such that the umbrella valve (25, 325) at least partially opens the air outlet opening (14, 214) during inhalation and the umbrella valve (25, 325) closes the air outlet opening (14, 214) during exhalation.

8. Filter cartridge (10) according to one of the preceding claims, wherein second air guiding ribs (226) are arranged in the air outlet opening (14, 214).

9. Filter cartridge (10) according to claim 8, wherein the second air guide ribs (226) have recesses (227) for air exchange of regions (233) between the second air guide ribs (226).

10. Filter cartridge (10) according to claim 9, wherein the recesses (227) are arranged in the second air guide ribs (226) on a side facing the umbrella valve (25, 325).

11. Filter cartridge (10) according to one of claims 8 to 10 and one of claims 5 or 6, wherein at least one air guide rib of the first air guide ribs (222) and at least one air guide rib of the second air guide ribs (226) are integrally formed in one piece.

12. Filter cartridge (10) according to one of claims 7 to 11, wherein a screen (328) of the screen valve (25, 325) is designed such that it lifts unevenly from the air outlet opening (14, 214) during inhalation.

13. Filter cartridge (10) according to one of the preceding claims, wherein the housing (11) has a frame element (31) for fastening the particle filter element (16).

14. Filter cartridge (10) according to one of the preceding claims, further comprising an interface (50) for attachment to a respiratory mask.

15. Respiratory mask with a filter cartridge (10) according to one of claims 1 to 14.

16. Use of a particle filter element (16) in a filter cartridge (10) according to one of claims 1 to 14.

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