Filter cartridge for respiratory protection masks

Abstract

The utility model relates to a filter core for respiratory protective mask, the filter core includes the casing, the casing has the air inlet cross section, bottom and the air outlet opening arranged in the bottom, gas filter element, particle filter element, the casing has the grating with a plurality of grating cross points spaced apart with the bottom, wherein, gas filter element is arranged between the bottom and the grating, and particle filter element is arranged between the air inlet cross section and the grating, first non - woven cloth is arranged between the grating and gas filter element, and second non - woven cloth is arranged between gas filter element and the bottom, the spacing between the air outlet opening and second non - woven cloth and the spacing between second non - woven cloth and first non - woven cloth are at least 0.75, especially at least 0.80, especially at least 0.85.

Description

Technical Field

[0001] This utility model relates to a filter element for a respiratory protective mask. Background Technology

[0002] In the prior art, filter elements for respiratory protective masks are widely known and used, for example, in spray painting operations. The purpose of such filter elements is to protect the wearer from harmful substances in the air (such as particles and / or organic vapors) during inhalation. These filter elements typically comprise multiple layers of different filter elements. In operation, i.e., when air containing harmful substances is inhaled, the filter elements adsorb these harmful substances, such as particulate matter.

[0003] Against this backdrop, it has now been shown that there is still an additional need to provide a filter element, especially one that has a more efficient operating mode, a longer lifespan, and improved airflow. Utility Model Content

[0004] According to a first aspect of the present invention, a filter element for a respiratory protective mask is provided, the filter element comprising: a housing having an air inlet cross section, a bottom, and an air outlet disposed in the bottom; a gas filtering element; and a particulate filtering element; wherein the housing has a grid with multiple grid intersections spaced apart from the bottom; wherein the gas filtering element is disposed between the bottom and the grid, and the particulate filtering element is disposed between the air inlet cross section and the grid; wherein a first nonwoven fabric is disposed between the grid and the gas filtering element, and a second nonwoven fabric is disposed between the gas filtering element and the bottom; wherein the ratio of the distance between the air outlet and the second nonwoven fabric to the distance between the second nonwoven fabric and the first nonwoven fabric is at least 0.75, particularly at least 0.80, particularly at least 0.85.

[0005] A filter element for a respiratory protective mask is provided herein, the filter element comprising: a housing having an air inlet cross section, a bottom, and an air outlet disposed in the bottom; a gas filter element; a particulate filter element; the housing having a grid with a plurality of grid intersections spaced apart from the bottom; the gas filter element disposed between the bottom and the grid, and the particulate filter element disposed between the air inlet cross section and the grid; a first nonwoven fabric disposed between the grid and the gas filter element, and a second nonwoven fabric disposed between the gas filter element and the bottom; the ratio of the distance between the air outlet and the second nonwoven fabric to the distance between the second nonwoven fabric and the first nonwoven fabric is at least 0.75.

[0006] Furthermore, it is proposed that: the ratio of the distance between the air outlet and the second nonwoven fabric to the distance between the second nonwoven fabric and the first nonwoven fabric is at least 0.8. Furthermore, it is proposed that: the ratio of the distance between the air outlet and the second nonwoven fabric to the distance between the second nonwoven fabric and the first nonwoven fabric is at least 0.85. Furthermore, it is proposed that: the ratio of the distance between the air outlet and the second nonwoven fabric to the distance between the second nonwoven fabric and the first nonwoven fabric is less than 1.2. Furthermore, it is proposed that: the ratio of the distance between the air outlet and the second nonwoven fabric to the distance between the second nonwoven fabric and the first nonwoven fabric is less than 1. Furthermore, it is proposed that: at least a portion of the grid intersections each have a protrusion, thereby creating free space between the gas filter element and the particulate filter element for lateral air exchange between the various regions of the grid relative to the main flow direction. Furthermore, it is proposed that: the protrusion is arranged between the grid and the particulate filter element. Furthermore, it is proposed that: the housing has a first air guide rib at the bottom pointing towards the air outlet. Furthermore, it is proposed that: the first air guide rib has one or more grooves for air exchange in the region between the first air guide ribs. Furthermore, it is proposed that a protective valve is arranged in the air outlet, such that the protective valve at least partially opens the air outlet during inhalation and closes the air outlet during exhalation. Furthermore, it is proposed that a second air guide rib is arranged in the air outlet. Furthermore, it is proposed that the second air guide rib has a groove for air exchange in the area between the second air guide ribs. Furthermore, it is proposed that the groove is arranged on the side of the second air guide rib facing the protective valve. Furthermore, it is proposed that at least one of the first air guide ribs and at least one of the second air guide ribs are integrally formed. Furthermore, it is proposed that the protective cover of the protective valve is configured such that the protective cover rises unevenly from the air outlet during inhalation. Furthermore, it is proposed that the housing has a frame element for fixing the particulate filter element. Furthermore, it is proposed that the filter element for the respiratory protective mask also includes an interface for fixing at the respiratory protective mask.

[0007] The term "filter element" specifically refers to a device used to filter air as air flows through it. Here, air flows into the filter element from the outside or unfiltered, onto a first side, the so-called inlet cross-section. The air flows through the filter element and exits from a second side, the so-called outlet opening. Furthermore, air can flow through the filter element under positive or negative pressure. For example, negative pressure can be generated by inhalation, particularly by the inhalation of a person wearing a respirator.

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

[0009] The term "respiratory protective mask" specifically refers to a device that can be worn by a person and is capable of filtering the air inhaled and / or exhaled by the person during wear. Here, the respiratory protective mask may be constructed to house at least one filter element for filtering the air inhaled by the person. Furthermore, the respiratory protective mask may be designed to at least partially or completely surround the person's face, particularly the mouth and nose.

[0010] The term "enclosed" specifically refers to a respiratory protective mask designed to deliver filtered air to enclosed body parts, such as the face, mouth, and / or nose. A respiratory protective mask is particularly designed to airtightly enclose the enclosed body parts, especially the face, mouth, and / or nose, meaning the mask fits snugly against the face so that no or minimal air escapes between the mating surfaces. Respiratory protective masks are particularly often half-face masks.

[0011] The term "casing" specifically refers to a geometry in which the casing can be constructed, for example, as the first filter element of a filter cartridge. Furthermore, the casing may have locking protrusions. The casing is used to arrange sub-components of the filter cartridge. The casing can be constructed as a single piece or as multiple parts. The casing, in particular, has a non-circular cross-section in most areas. The casing, in particular, has a hexagonal and six-sided cross-section. The corners of the casing are, in particular, rounded.

[0012] The term "bottom" specifically refers to a geometry in which the bottom can be configured, for example, as a second filter element of a filter cartridge. Furthermore, the bottom may have locking protrusions corresponding to the housing to create a locking connection between the housing and the bottom.

[0013] For example, when the housing and bottom are locked together, the housing and bottom form the body of the filter element and are designed to house or arrange at least gas filter elements, particulate filter elements and grids within the housing and bottom.

[0014] Preferably, the bottom and sidewalls of the housing are designed as one piece.

[0015] The term "inlet cross-section" specifically refers to an opening in the housing designed to allow air to flow into the housing. For example, at least a portion of one side of the housing may have an inlet cross-section. For example, the inlet cross-section may have an area larger than half the area of ​​that side of the housing. The inlet cross-section is arranged above the particulate filter element. In particular, the inlet cross-section is located within the frame or cover of the filter element, or within the frame or cover of the filter element's housing. The frame or cover is preferably constructed as a separate component that can be connected to the rest of the housing portion of the filter element.

[0016] The term "vent opening" specifically refers to an opening in the bottom that is designed to allow air to flow out of the housing. For example, at least a portion of one side of the bottom may have a vent opening. For example, the vent opening may be a circular area. The vent opening may also be equipped with a valve for opening and closing. Preferably, the vent opening is located next to the center of the long side of the bottom. Preferably, the vent opening is located at the center of the short side of the bottom.

[0017] The term "gas filter element" specifically refers to a filter element designed to separate and / or absorb and / or adsorb harmful substances in unfiltered air gases and / or vapors. Here, the gas filter element may, for example, at least partially comprise an activated carbon element. In particular, the gas filter element may have activated carbon granules and / or an activated carbon packing layer and / or compressed activated carbon granules and / or compressed activated carbon granule material. Specifically, the filter element is designed to filter organic gases and vapors from the air, such as gases and vapors containing solvents, paints, adhesives, and cleaning agents. The filter is particularly an A2-class filter. The filter may particularly be a combination of an adsorption filter and an absorption filter.

[0018] The term "particulate filter element" specifically refers to a filter element designed to capture particles in unfiltered air as they pass through and / or flow along the filter element. Particulate filter elements are particularly constructed as flat-panel filters. Particulate filter elements are particularly constructed as non-pleated filters. Particulate filter elements are particularly constructed as fine filters. Particulate filter elements are particularly bonded and / or welded to a grille and / or housing. Particulate filter elements are particularly constructed to be replaceable.

[0019] The filter element may have multiple particulate filter elements and / or multiple gas filter elements. The multiple particulate filter elements may be designed to be of the same or different types. The multiple gas filter elements may be designed to be of the same or different types. The filter element may also have other types of filter elements. The filter element may have a pre-filter element. The pre-filter element may be arranged upstream of the particulate filter element, particularly in the following main flow direction, to protect the particulate filter element from contamination by larger particles. The pre-filter element may particularly be constructed to be replaceable.

[0020] The term "grid" specifically refers to a device designed to carry particulate filter elements. The grid can also be used for spatial positioning of gas filter elements. The grid can be arranged inside a housing in a removable or non-removable manner. The grid and housing are connected, in particular, by adhesive bonding and / or ultrasonic welding and / or by mechanical and / or form-fit connections. The grid is particularly inserted into the housing. The edges of the grid particularly surround the upper edge of the housing. A sealing element is particularly arranged between the grid and the housing.

[0021] The term "grid intersection" specifically refers to a location within a grid where the first grid bar intersects with the second grid bar. For example, the first grid bar may extend from a first side of the grid to a third side, and the second grid bar may extend from a second side of the grid to a fourth side.

[0022] The term "nonwoven fabric" specifically refers to a breathable fabric designed to prevent the rupture of gas filter elements. Nonwoven fabric acts as a boundary for gas filter elements, preventing individual particles (such as activated carbon particles) from being carried by the airflow. Nonwoven fabrics may also have additional filtration functions. The term "nonwoven fabric" can also specifically refer to nonwoven fabric in its literal sense. The term "nonwoven fabric" can also specifically refer to a fabric made by weaving, warp knitting, weft knitting, or other methods such as yarn interlacing or entanglement. The yarns can be made of natural materials and / or synthetic fibers.

[0023] This method improves the stability of the gas filter element and enhances user safety.

[0024] The term "spacing" specifically refers to the shortest distance between the aforementioned components, particularly the shortest distance in the main flow direction.

[0025] Preferably, the distance between the air outlet and the second nonwoven fabric is constant. The air outlet and the second nonwoven fabric are arranged parallel to each other. The opening surface of the air outlet is arranged parallel to the second nonwoven fabric. Specifically, when determining the distance between the air outlet and the second nonwoven fabric, the outermost flange defining the air outlet is used as a reference. Specifically, when determining the distance between the air outlet and the second nonwoven fabric, the lower surface of the second nonwoven fabric is used as a reference.

[0026] Preferably, the distance between the second nonwoven fabric and the first nonwoven fabric is constant. The second nonwoven fabric and the first nonwoven fabric are arranged, in particular, parallel to each other. Specifically, when determining the distance between the second and first nonwoven fabrics, the upper side surface of the second nonwoven fabric should be used as a reference. Specifically, when determining the distance between the second and first nonwoven fabrics, the lower side surface of the first nonwoven fabric should be used as a reference. The distance between the second and first nonwoven fabrics is particularly equal to the extension of the gas filter element in the main flow direction.

[0027] The ratio of spacing h1 to spacing h2 is calculated by dividing h1 by h2.

[0028] According to one embodiment, at least a portion of the grid intersections have protrusions, thereby creating free space between the gas filter element and the particulate filter element for lateral air exchange between the various regions of the grid relative to the main flow direction.

[0029] The term "main flow direction" specifically refers to the direction of the unfiltered airflow through the filter element, wherein the main flow direction extends, for example, from the intake cross-section through the particulate filter element and the gas filter element to the outlet opening. The main flow direction is particularly ideal. The main flow direction extends particularly perpendicular to the particulate filter element and / or perpendicular to the gas filter element.

[0030] The term "protrusion" specifically refers to a geometric change in the shape of the grid intersection in a direction orthogonal to the grid base plane. Protrusions can also be configured, for example, to extend from the grid intersection toward the gas filter element and / or particulate filter element. Protrusions can also be designed to allow the particulate filter element and / or gas filter element to be supported and / or secured in a spaced-apart manner from the grid.

[0031] The term "grid area" specifically refers to the openings or meshes between individual grid points.

[0032] The fundamental understanding of this invention is that particulate filter elements are unevenly incorporated with particles during operation. This results in an uneven distribution of the opening area in the main flow direction. This adversely affects the filtration performance of the particulate filter element and subsequent gas filter elements, as the gas filter elements primarily intake or flow in the area below the unblocked region of the particulate filter element. Consequently, overall air intake becomes difficult due to increased flow resistance. As particles continue to accumulate, the area within the gas filter element available for gas passage gradually decreases. Compared to existing technologies, this invention solves the above problem by increasing the distance between the outlet opening and the second nonwoven fabric. This distance is at least 0.75 times, particularly at least 0.80 times, and especially at least 0.85 times, the distance between the second and first nonwoven fabrics. The distance between the second and first nonwoven fabrics is particularly equal to the extension of the gas filter element in the main flow direction. The distance between the second and first nonwoven fabrics is particularly equal to the height or thickness of the gas filter element.

[0033] The increased spacing between the air outlet and the second nonwoven fabric allows for more even airflow into the filter element. This enables larger-area and distributed air intake or flow to the gas filter element. This positively impacts the overall operation and efficiency of the respirator and can further extend the lifespan of the gas filter element and / or particulate filter element.

[0034] According to one embodiment, the ratio of the distance between the air outlet and the second nonwoven fabric to the distance between the second nonwoven fabric and the first nonwoven fabric is less than 1.2, and particularly less than 1.0. This enables a compact structure for the filter element.

[0035] According to one embodiment, at least a portion of the grid intersections have protrusions, thereby forming a free space between the gas filter element and the particulate filter element for lateral air exchange between the various regions of the grid relative to the main flow direction.

[0036] The protrusions create free space between them. This free space allows for air exchange between the different areas of the grille.

[0037] In existing filter cartridges, if no protrusions are provided between the various areas of the grille, there will be no transverse air exchange in the direction of the main airflow.

[0038] According to one embodiment, the protrusions can be arranged between the grid and the particulate filter element.

[0039] The particulate filter elements are particularly arranged at the intersections of the grids with raised sections.

[0040] These protrusions allow airflow to occur between the gas filter element and the particulate filter element. Furthermore, these protrusions allow for airflow control, thereby promoting, for example, circulation between the gas filter element and the particulate filter element.

[0041] According to one embodiment, the housing may have a first air guide rib at the bottom pointing toward the air outlet.

[0042] The term "first air guide rib" specifically refers to a device for guiding airflow from the gas filter element to the outlet opening. Here, the first air guide rib can form a chamber that segments the space between the gas filter element and the outlet opening.

[0043] In this way, airflow can be guided from the gas filter element to the outlet. Furthermore, the airflow can be controlled via the first air guide rib to further improve the flow of air from the gas filter element to the outlet.

[0044] Preferably, the second nonwoven fabric is arranged on the first air-guiding rib. In this way, the nonwoven fabric and / or the gas filter element can be supported by the first air-guiding rib.

[0045] The first air guide rib extends perpendicularly to the bottom of the housing or filter element. The first air guide rib extends in a direction opposite to the aforementioned main flow direction.

[0046] According to one embodiment, the first air guide rib may have one or more grooves for air exchange in the area between the first air guide ribs.

[0047] The term "groove" specifically refers to an opening between a first region located between the first air guide ribs and a second region located between the second air guide ribs. The groove may be arranged on the side facing or away from the gas filter element, or within the air guide ribs. The groove is particularly located on the side facing the gas filter element.

[0048] In this way, airflow can be guided, for example, from a first region of the formed area to a second region of the formed area, thereby enabling the airflow to be evenly distributed in the various regions between the first air guide ribs. This results in more efficient operation of the filter element because of reduced flow resistance.

[0049] According to one embodiment, a shield valve may be provided in the air outlet, such that the shield valve at least partially opens the air outlet during inhalation and closes the air outlet during exhalation.

[0050] The term "shroud valve" specifically refers to a valve device that allows airflow from a first side of the shroud valve to a second side and prevents airflow from the second side to the first side. Furthermore, the shroud valve may include a protective shield made of an elastomer and is designed to release and block airflow.

[0051] This method allows people to inhale air filtered by the filter element when they inhale. Furthermore, it prevents exhaled air from re-entering the filter element, which could potentially reduce the quality of inhaled air.

[0052] According to one embodiment, a second air guide rib may be arranged in the air outlet.

[0053] This allows for further optimization of the airflow from the gas filter element to the outlet, thereby improving the airflow through the filter and aiding breathing for those wearing respirators equipped with filters.

[0054] According to one embodiment, the second air guide rib may have a groove for air exchange in the area between the second air guide ribs.

[0055] Especially in the type of protective valve described in this utility model, the protective cover of the protective valve does not open evenly during intake, resulting in some areas of the exhaust opening being unable to open. During intake, the protective cover rises in a wavy rather than flat parallel manner relative to the exhaust opening. The second air guide ribs arranged in the exhaust opening further define the area. Without the grooves, when the protective cover opens unevenly, some areas would have no or only a very small amount of airflow through the exhaust opening because the protective cover would still at least partially cover these areas. The grooves facilitate air exchange between the various areas between the second air guide ribs.

[0056] This method allows for better airflow distribution within the outlet opening, reducing flow resistance. This improves or enhances the intake process.

[0057] According to one embodiment, the groove may be arranged on the side of the second air guide rib facing the shield valve.

[0058] In this way, the airflow can reach the outlet opening from the gas filter element between the various regions of the second air guide rib before reaching the protective cover, thus distributing the airflow between the various regions of the second air guide rib in an improved manner and method.

[0059] According to one embodiment, at least one of the first air guide ribs and at least one of the second air guide ribs may be integrally formed.

[0060] In this way, a region can be formed between the first and second air guide ribs, which improves the guidance of airflow from the gas filter element to the outlet, because the airflow can be continuously guided to the outlet.

[0061] According to one embodiment, the protective cover of the protective valve can be configured such that the protective cover rises unevenly from the exhaust opening during intake.

[0062] The protective cover of the valve is made of an elastomer. The cover is particularly highly elastic and flexible. During intake, the cover deforms unevenly depending on the intake conditions. Some areas of the cover are lifted, while others remain attached to the exhaust opening.

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

[0064] The term "frame element" specifically refers to a means for arranging a particulate filter element on a housing. Alternatively or additionally, the term "frame element" may also refer to a means for protecting the particulate filter element, particularly from mechanical impact. "Frame element" may also specifically refer to a means for arranging a pre-filter element on the housing. The term "frame element" may also refer to a cover for the filter element and / or the housing. The frame element may be part of the housing. The frame element may be a separate component. The frame element may serve as an edging for the particulate filter element. The frame element may have an intake cross-section. The edges of the frame element may be designed to at least partially surround the edges of the grille. The edges of the frame element may be designed as locking elements. The edges of the grille may be designed as locking mating elements. The grille and frame element may be designed to form a locking connection for arranging the frame element on the filter element. The frame element may be detachably or non-detachably connected to the filter element.

[0065] The stability of the particle filter element arrangement can be improved by using frame elements.

[0066] According to one embodiment, the filter element may also have an interface for securing it to a respiratory protective mask.

[0067] The term "interface" specifically refers to a device for connecting a filter cartridge to a respirator in a form-fitting manner, wherein the interface is configured to connect to a receiving position of the respirator. The interface may also include locking connections, threaded devices, spring devices, snap-fit ​​devices, and / or locking devices designed for connection to the receiving position. The interface may particularly include locking devices.

[0068] Using the above method, the filter element can be easily connected to the respiratory protective mask. This allows for quick replacement or replacement of the filter element.

[0069] On the other hand, it relates to a respiratory protective mask equipped with a disclosed filter.

[0070] On the other hand, it relates to the application of particulate filter elements in the disclosed filter cartridges.

[0071] The features described above, as well as features from different implementations, can be combined with each other to produce a synergistic effect that exceeds the sum of their individual effects. Attached Figure Description

[0072] The embodiments of this utility model are described below with reference to the accompanying drawings: Figure 1 A cross-sectional view of an exemplary embodiment of the filter element according to the present invention is shown; Figure 2 A view showing an exemplary embodiment of the grid of a filter element according to the present invention is shown; Figure 3 A view showing an exemplary embodiment of the housing of a filter element according to the present invention is provided; and Figure 4 A view is shown of an exemplary embodiment of the filter element's protective valve according to the present invention.

[0073] The exemplary embodiments will now be described and explained in detail with reference to the accompanying drawings. Here, the same reference numerals or similar reference numeral structures denote similar or cooperating components. Detailed Implementation

[0074] Figure 1A cross-sectional view of an exemplary embodiment of filter element 10 is shown. Filter element 10 is configured to connect to a respiratory protective mask. For this purpose, filter element 10 has an interface 50, which is implemented as a locking connection. Here, filter element 10 has a first housing 11 with an air inlet cross section 12. A particulate filter element 16 is arranged below the air inlet cross section 12. The particulate filter element 16 is supported on a first grid 17. Here, the particulate filter element 16 is connected to the edge of the first grid 17 by adhesive bonding and / or ultrasonic welding. The edge of the first grid 17 surrounds the upper edge of the first housing 11. The first housing 11 also has a frame element 31 to further secure and / or protect the particulate filter element 16. Alternatively, the particulate filter element 16 can also be arranged in the first housing by adaptation. The edge of the frame element 31 has a locking element 32, which engages with a locking engagement element 18 formed by the edge of the first grid 17. A first nonwoven fabric 29 is arranged below the first grid 17. A gas filter element 15 is arranged below the first nonwoven fabric 29. The gas filter element 15 is here an activated carbon filter. Here, a second nonwoven fabric 30 is arranged below the gas filter element 15. A first bottom layer 13 is arranged below the second nonwoven fabric 30, and a first air outlet 14 is arranged within the first bottom layer. A first protective valve 25 is also arranged within the first air outlet 14. A first distance h1 exists between the first air outlet 14 and the second nonwoven fabric 30. A second distance h2 exists between the second nonwoven fabric 30 and the first nonwoven fabric 29. The ratio of the first distance h1 to the second distance h2 is approximately 0.8.

[0075] Figure 2 A top view of an exemplary second grille 117 of a filter element according to the present invention is shown. This second grille has a plurality of grille intersections 118. Each grille intersection 118 has a protrusion 119. Particulate filter elements (not shown) are arranged on these protrusions 119. Free space 120 is created between the particulate filter elements and the second grille 117 through these protrusions 119. Free space 120 allows air between the respective first regions 121 to flow laterally relative to the main flow direction of the second grille 117. This is advantageous when the particulate filter elements are incorporated in localized areas, preventing air from flowing in the main flow direction. This allows for an improved distribution of airflow within the filter element, as air can still flow laterally relative to the main flow direction even when particulate filter elements are incorporated. Alternatively, the protrusions may also be arranged on the side opposite to the particulate filter elements.

[0076] Figure 3An exemplary view of the second housing 211 of the filter element according to the present invention is shown. A second bottom 213 of the second housing 211 is provided in the lower region of the second housing 211. The second bottom 213 also has a second air outlet 214. First air guide ribs 222 are also arranged in the second bottom 213. The first air guide ribs 222 extend radially to the second air outlet 214. The first air guide ribs 222 have a plurality of first grooves 223. The first grooves 223 are used to facilitate air exchange between second regions 224 between the first air guide ribs 222. Second air guide ribs 226 are also arranged in the second air outlet 214. The second air guide ribs 226 also converge and extend radially in the second air outlet 214. Here, the second air guide ribs 226 are integrally formed with at least a portion of the first air guide ribs 222. The second air guide ribs 226 have second grooves 227, which facilitate air exchange between third regions 233 between the second air guide ribs 226. The second groove 227 is arranged on the side facing the shield valve (not shown). The second groove allows the shield valve to rise in a wave-like pattern during breathing, rather than uniformly, so that multiple individual third zones 233 are not released by the shield valve. The second groove 227 facilitates air exchange between the third zones 233, allowing air to flow between the third zones 233 where the shield valve is not released and those where it is released. The second outlet opening 214 has a central receiving portion 232 for the shield valve (not shown).

[0077] Figure 4 A view is shown of an exemplary embodiment of the second shield valve 325 of the filter element according to the present invention. The second shield valve 325 has a protective cover 328. The second shield valve also has a pin 340 at its center for mounting in a receiving portion 232 of a second air outlet opening 214. The pin 340 is introduced into the receiving portion 232 at the outer side of the second housing 211 until the tip of the head of the pin 340 protrudes from the opening of the receiving portion 232 at the inner side of the second housing 211. Thus, the head of the pin 340 is completely pulled out and released from the receiving portion 232, so that the undercut of the head of the pin 340 abuts against the inner end face of the receiving portion 232, and the second shield valve 325 is held in the receiving portion 232. The second shield valve 325 is made of an elastomer, such as EPDM (ethylene propylene diene monomer rubber).

[0078] Reference number

[0079] 10 Filter Cartridges

[0080] 11 First Shell

[0081] 211 Second shell

[0082] 12. Inlet cross-section

[0083] 13 First bottom

[0084] 213 Second Bottom

[0085] 14 First vent opening

[0086] 214 Second air outlet

[0087] 15 Gas filter elements

[0088] 16 Particle filter elements

[0089] 17 First Grille

[0090] 117 Second Grille

[0091] 18 Locking elements

[0092] 25 First shield valve

[0093] 325 Second Protective Valve

[0094] 29 First Nonwoven Fabric

[0095] 30 Second Nonwoven Fabric

[0096] 31 Frame Components

[0097] 32 Locking elements

[0098] 50 interface

[0099] 118 Grid intersection

[0100] 119 protrusions

[0101] 120 Free Space

[0102] 121 First District

[0103] 222 First air guide rib

[0104] 223 First Groove

[0105] 224 Second Zone

[0106] 226 Second air guide rib

[0107] 227 Second Groove

[0108] 232 Reception Department

[0109] 233 Third Region

[0110] 328 Protective Shield

[0111] 340 pins

[0112] h1 First spacing

[0113] h2 is the second spacing.

Claims

1. A filter element for a respiratory protective mask, the filter element for the respiratory protective mask comprising: A housing having an air inlet cross section (12), a bottom, and an air outlet disposed in the bottom; Gas filter element (15); Particulate filter element (16); The housing has a grid spaced apart from the bottom with a plurality of grid intersections (118); The gas filter element (15) is arranged between the bottom and the grille, and the particulate filter element (16) is arranged between the air intake cross section (12) and the grille; The feature is that a first nonwoven fabric (29) is arranged between the grid and the gas filter element (15), and a second nonwoven fabric (30) is arranged between the gas filter element (15) and the bottom. The ratio of the distance between the air outlet and the second nonwoven fabric (30) to the distance between the second nonwoven fabric (30) and the first nonwoven fabric (29) is at least 0.

75.

2. The filter element for a respiratory protective mask according to claim 1, characterized in that, The ratio of the distance between the air outlet and the second nonwoven fabric (30) to the distance between the second nonwoven fabric (30) and the first nonwoven fabric (29) is at least 0.

8.

3. The filter element for a respiratory protective mask according to claim 2, characterized in that, The ratio of the distance between the air outlet and the second nonwoven fabric (30) to the distance between the second nonwoven fabric (30) and the first nonwoven fabric (29) is at least 0.

85.

4. The filter element for a respiratory protective mask according to claim 1, characterized in that, The ratio of the distance between the air outlet and the second nonwoven fabric (30) to the distance between the second nonwoven fabric (30) and the first nonwoven fabric (29) is less than 1.

2.

5. The filter element for a respiratory protective mask according to claim 4, characterized in that, The ratio of the distance between the air outlet and the second nonwoven fabric (30) to the distance between the second nonwoven fabric (30) and the first nonwoven fabric (29) is less than 1.

6. The filter element for a respiratory protective mask according to claim 1, characterized in that, At least a portion of the grid intersections (118) have protrusions (119) to create free space (120) between the gas filter element (15) and the particulate filter element (16) for lateral air exchange between the various regions of the grid relative to the main flow direction.

7. The filter element for a respiratory protective mask according to claim 6, characterized in that, The protrusion (119) is arranged between the grid and the particle filter element (16).

8. The filter element for a respiratory protective mask according to claim 1, characterized in that, The housing has a first air guide rib (222) at the bottom pointing toward the air outlet.

9. The filter element for a respiratory protective mask according to claim 8, characterized in that, The first air guide rib (222) has one or more grooves for air exchange in the area between the first air guide ribs (222).

10. The filter element for a respiratory protective mask according to claim 8, characterized in that, A protective valve is arranged in the air outlet, such that the protective valve at least partially opens the air outlet during inhalation and closes the air outlet during exhalation.

11. The filter element for a respiratory protective mask according to claim 10, characterized in that, A second air guide rib (226) is arranged in the air outlet.

12. The filter element for a respiratory protective mask according to claim 11, characterized in that, The second air guide rib (226) has a groove for air exchange in the area between the second air guide ribs (226).

13. The filter element for a respiratory protective mask according to claim 12, characterized in that, The groove is arranged on the side of the second air guide rib (226) facing the shield valve.

14. The filter element for a respiratory protective mask according to claim 11, characterized in that, At least one of the first air guide ribs (222) and at least one of the second air guide ribs (226) are integrally formed.

15. The filter element for a respiratory protective mask according to claim 10, characterized in that, The protective cover (328) of the protective valve is configured such that the protective cover (328) is unevenly raised from the exhaust opening during intake.

16. The filter element for a respiratory protective mask according to claim 1, characterized in that, The housing has a frame element (31) for fixing the particulate filter element (16).

17. The filter element for a respiratory protective mask according to claim 1, characterized in that, The filter element for the respiratory protective mask also includes an interface (50) for securing it to the respiratory protective mask.

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