A mine-used high-efficiency low-resistance dust mask

Abstract

A kind of mining high-efficiency low-resistance dust mask, filter box is connected on mask main body;Composite filter core is installed in filter box, and the inner cavity of filter box is isolated into filter front chamber and filter rear chamber;Composite filter core is composed of metal base layer and film layer;Metal base layer is made of metal wire mesh, and irregular mesh holes are distributed on the wire mesh;Metal base layer is sequentially provided with several recesses recessed to rear side along length direction, and the recess depths of several recesses are different;Film layer is PTFE microporous membrane, and film layer is attached to the surface of the front side of metal base layer;Flow guide dust cleaning pad is installed in filter box, and located at the rear side of composite filter core;Several protruding parts are provided on the surface of the front side of flow guide dust cleaning pad, and the center of each protruding part is provided with a tapered hole penetrating through its length direction, wherein, the small end of tapered hole is located at the front end.The mask has good filtering effect, large dust capacity, long service life, can be blowed and washed, and can be used repeatedly.

Description

Technical Field

[0001] This invention belongs to the field of dust prevention technology, specifically relating to a high-efficiency, low-resistance dustproof face mask for mining. Background Technology

[0002] Coal mines are characterized by high concentrations of dust, necessitating stringent dust protection measures. Currently, miners primarily wear self-priming KN95 and KN100 masks for dust protection. KN95 masks typically utilize a single-piece electrostatic adsorption filter or activated carbon fiber, achieving a dust filtration efficiency of 95%. They offer greater comfort and lower breathing resistance, but their filtration efficiency for respirable dust (dust with an aerodynamic diameter <7.07μm) is poor. KN100 masks boast a filtration efficiency of 99.97%, effectively isolating respirable dust and preventing pneumoconiosis. They are often based on KN95 masks with thicker filter material for even higher protection efficiency, but this results in lower comfort and higher breathing resistance. This is particularly problematic for miners engaged in high-intensity work underground, who are prone to abandoning their masks due to the increased breathing resistance. Furthermore, existing dust masks generally have limited dust capacity, leading to shorter lifespans in high-dust-concentration environments and higher replacement frequency, thus increasing protection costs. Therefore, there is an urgent need to provide a dust mask that is highly effective at preventing dust, has low breathing resistance, is comfortable to wear, and has a large dust capacity. Summary of the Invention

[0003] To address the problems existing in the prior art, this invention provides a high-efficiency, low-resistance dustproof mask for mining. This mask has low breathing resistance, excellent wearing comfort, high dust capacity and good filtration performance, long service life, and can be blown and washed for cleaning. It can be reused multiple times, which helps reduce protection costs.

[0004] To achieve the above-mentioned objectives, the present invention provides a high-efficiency, low-resistance dustproof face mask for mining, comprising a face mask body, a filter box, a composite filter element, and a flow-guiding and dust-removing pad.

[0005] The filter cartridge is connected to the mask body;

[0006] The composite filter element is installed in the filter box, which isolates the inner cavity of the filter box into a pre-filtration chamber and a post-filtration chamber; the composite filter element consists of a metal base layer and a membrane layer;

[0007] The metal base layer is made of metal wire mesh, which is covered with irregular mesh holes; the metal base layer has a number of recessed grooves along its length, and the depth of the recessed grooves is different.

[0008] The coating layer is a PTFE microporous membrane, which is adhered to the surface of the front side of the metal substrate;

[0009] The flow guiding and cleaning pad is installed in the filter box and is located on the rear side of the composite filter element; the front side of the flow guiding and cleaning pad is covered with a number of protrusions, and each protrusion has a conical hole in the center that runs through its length direction, wherein the small end of the conical hole is located at the front end.

[0010] This invention features a series of recessed grooves of varying depths along the length of a metal substrate. Compared to traditional planar filter media or filter media with uniformly deep pleats, these grooves significantly increase the filtration area and dust volume within a limited region. This improves filtration efficiency and dust holding capacity, extending the effective lifespan of the filter element. Furthermore, the unique geometry of these grooves guides and disperses airflow more evenly and effectively into the pre-filter chamber, allowing for greater directional changes as air passes through the filter element. This multidirectional airflow path increases the contact between suspended particles and the filter material surface, enhancing particle capture efficiency. Simultaneously, the dispersed airflow path reduces pressure concentration at any single point, lowering overall breathing resistance and significantly improving user comfort. Moreover, the varying depths of the grooves create additional collision and interception points, making particles more easily interfered with and ultimately captured as they pass through the filter material, increasing the success rate of dust capture. PTFE microporous membranes possess a microporous structure with interwoven fibers and a porosity of 80%–90%. Their unique microporous structure, lacking through-holes and featuring small, uniform pore sizes, effectively intercepts dust particles. They exhibit surface filtration mechanisms and excellent non-adhesive properties. With strong hydrophobicity, good durability, and low surface tension, they easily and effectively remove surface-accumulated dust. Their filtration performance can be quickly restored through washing or backflushing, resulting in a long service life and a filtration efficiency of up to 99.999995%. Therefore, using PTFE microporous membranes as a coating layer fully utilizes their unique microporous structure, allowing only gas to pass through while preventing dust from entering the membrane's interior or substrate. Simultaneously, processes such as direct interception, collision, Brownian motion, and electret effect can filter and retain dust on the membrane surface, achieving highly efficient separation of dust and gas. This invention effectively combines a metal base layer and a membrane layer, fully utilizing the structural stability of the metal base layer and the low surface tension, water resistance, and special microporous structure of the membrane layer. This gives the composite filter element washability, good antistatic properties, and the ability to be repeatedly cleaned by tapping. When excessive dust accumulates on the filter element, it can be easily removed by washing or tapping, allowing for multiple uses. A flow-guiding and dust-cleaning pad with several protrusions is located on the rear side of the composite filter element, with a conical hole at the center of each protrusion. The smaller end of the conical hole is positioned at the front. During inhalation, the gradually increasing hole diameter significantly reduces intake resistance and airflow velocity, effectively lowering breathing pressure and resistance. This helps ensure a smoother and more natural breathing process, while the reduced airflow velocity improves air purification.Furthermore, when the airflow passes in the opposite direction, it exits through the smaller end and is then ejected. This gradually narrowing cross-section design accelerates the airflow as it passes through the guide layer, creating a jet effect. As the airflow flows through the constricted channel, the cross-sectional area inside the pipe decreases, increasing both the airflow velocity and pressure. This accelerated and pressurized airflow has a stronger impact force as it passes through the filter layer, more effectively flushing and removing particles adhering to the filter media surface. Furthermore, because the airflow-guiding cleaning pad can repeatedly provide jet action, it can repeatedly remove particles accumulated on the filter media. This process not only efficiently removes dust from the filter media surface but also prevents deep penetration and accumulation of particles. It reduces the risk of performance degradation or clogging of the filter media due to particle accumulation, maintaining the high filtration efficiency and permeability of the filter layer. This not only ensures high filtration efficiency during use but also effectively alleviates the problem of increased breathing resistance in the filter layer after prolonged use, reducing the frequency and difficulty of filter maintenance, extending the effective service life of the filter, and ensuring stability and reliability in high-concentration dust workplaces. At the same time, it also enhances the user's comfort experience. This mask has low breathing resistance, excellent wearing comfort, high dust holding capacity, and good filtration performance. It has a long service life, can be blown cleaned and washed with water, and can be reused multiple times, which helps reduce protection costs and has good prospects for widespread application.

[0011] Furthermore, in order to better improve the filtration effect and further increase the dust holding capacity, the plurality of grooves are composed of dust holding filter unit one and dust holding filter unit two arranged alternately in sequence.

[0012] The first dust-collecting filter unit is a deep groove or multiple deep grooves distributed continuously, and the second dust-collecting filter unit is a shallow groove or multiple shallow grooves distributed continuously.

[0013] By combining grooves of varying depths in a regular pattern, the effective filtration area and dust holding capacity of the filter element can be increased, while also improving the overall stability of the filter element. This also helps ensure that different areas of the filter element can achieve good filtration results.

[0014] Furthermore, to balance the filtration pressure, the coating layer is thicker in the core breathing region than in the auxiliary breathing region. This thicker core region and thinner auxiliary breathing region effectively optimizes the filter element's structure. This variable density gradient design allows for greater airflow resistance in the core breathing region and lower airflow resistance in the auxiliary breathing region during exhalation. This ensures that when negative inhalation pressure acts on the post-filtration chamber, the incoming airflow is better distributed to the auxiliary breathing regions on both sides. This airflow diversion not only reduces overuse and rapid failure of the core breathing region but also ensures more uniform utilization of the entire filter element layer. This allows the entire composite filter element to perform effective filtration, achieving zoned purification and reducing overall airflow resistance. This helps ensure that all parts of the filter element reach their service life and replacement deadline simultaneously, avoiding waste. Simultaneously, it allows the auxiliary breathing region to more effectively capture dust, significantly improving its utilization efficiency. Therefore, through this variable density gradient design, the present invention optimizes the overall airflow distribution and resistance characteristics of the filter layer while maintaining high-efficiency filtration performance, making it better able to meet the needs of long-term wear and high-efficiency filtration.

[0015] Furthermore, to increase the dust holding capacity of the groove, the cross-section of the groove is trapezoidal or U-shaped. When the cross-section of the groove is trapezoidal, the opening end of the groove corresponds to the long side of the trapezoid. When the cross-section of the groove is trapezoidal, the groove has an involute structure, which significantly increases the filtration area and volume of a single groove, thereby helping to increase the overall filtration area and volume of the filter element.

[0016] Furthermore, to better balance the filtration pressure, the distribution density of the grooves in the core breathing region is greater than that in the auxiliary breathing region. This higher groove density in the core breathing region and lower density in the auxiliary breathing region increases airflow resistance in the core region while reducing airflow resistance in the auxiliary breathing region. This allows for better airflow distribution to both auxiliary breathing regions, ensuring more efficient utilization of all parts of the filter element.

[0017] Furthermore, the lateral dimension of the groove located in the core breathing region is larger than that of the groove located in the auxiliary breathing region. This larger lateral dimension of the groove in the core breathing region increases the effective filtration area and volume of the filter element, thereby significantly improving the filtration efficiency and dust holding capacity of the breathing area and extending the overall service life.

[0018] Furthermore, the outer contour of the protrusion is conical or cylindrical. Making the outer contour of the protrusion conical or cylindrical provides a certain degree of support and isolation for the composite filter element, thereby forming an airflow buffer chamber between the composite filter element and the main body of the flow-guiding cleaning pad, which facilitates a smoother flow of air into the post-filter chamber.

[0019] Furthermore, to ensure that the airflow entering the filter box does not directly enter the filter chamber from the periphery of the composite filter element, the periphery of the composite filter element is sealed to the periphery of the filter box cavity through sealing component one. To ensure that the airflow can act more effectively on the composite filter element when it passes through in the opposite direction, so as to achieve a more efficient dust removal effect, the periphery of the flow guiding dust removal pad is sealed to the periphery of the composite filter element through sealing component two.

[0020] Furthermore, in order to facilitate the maintenance and replacement of the filter components, the filter box is a laterally extending arc-shaped structure, which is composed of a front shell and a rear shell that are fastened together.

[0021] An air inlet groove is provided on the front housing, which is connected to the pre-filter chamber;

[0022] The upper part of the rear side of the rear housing is fixedly connected to an air passage connector that communicates with the filter chamber.

[0023] The lower part of the mask body has an air outlet with a breathing valve installed therein; the upper part of the mask body has an air inlet with an intake valve installed therein. Simultaneously, the mask body has a second air passage connector connected to the air inlet on its front side, which is compatible with the first air passage connector. The mask body is connected to the filter box via the interconnected second and first air passage connectors. Connecting the first air passage connector to the rear shell not only facilitates the establishment of an air passage between the filter box and the mask body, but also allows for direct blowing of cleaning airflow into the post-filter chamber during dust removal, facilitating efficient removal of dust adhering to the composite filter element.

[0024] Furthermore, to facilitate quick assembly and disassembly between the mask body and the filter box, both the first and second air connectors have circular or elliptical cross sections, and they are connected by a fitting mechanism. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the split structure of the present invention;

[0026] Figure 2 This is a side view of the present invention;

[0027] Figure 3 This is a rear view of the present invention;

[0028] Figure 4 This is a schematic diagram of the composite filter element in this invention;

[0029] Figure 5 yes Figure 5 A partial schematic diagram;

[0030] Figure 6 This is a schematic diagram of the structure of the flow-guiding and dust-removing pad in this invention.

[0031] In the diagram: 1. Mask body, 2. Filter box, 3. Composite filter element, 4. Metal base layer, 5. Membrane layer, 6. Airflow guiding and dust removal pad, 7. Protrusion, 8. Groove, 9. Conical hole, 10. Deep groove, 11. Shallow groove, 12. Front shell, 13. Rear shell, 14. Air inlet groove, 15. Air path connector one, 16. Air path connector two, 17. Air outlet, 18. Breathing valve, 19. Air inlet, 20. Inhalation valve, 21. Ear loop. Detailed Implementation

[0032] The invention will now be further described with reference to the accompanying drawings.

[0033] like Figures 1 to 6 As shown, the present invention provides a high-efficiency, low-resistance dustproof mask for mining, including a mask body 1, a filter box 2, a composite filter element 3, and a flow-guiding and dust-removing pad 6.

[0034] The filter cartridge 2 is connected to the mask body 1, and the inner cavity of the filter cartridge 2 is connected to the inner cavity of the mask body 1 through a breathing channel; as a preferred embodiment, the filter cartridge 2 is a horizontally extending arc-shaped structure, and its two ends are arc-shaped transitions towards the face.

[0035] The composite filter element 3 is installed in the filter box 2, and the inner cavity of the filter box 2 is isolated into a pre-filtration chamber and a post-filtration chamber;

[0036] Based on the human respiratory characteristics and the adhesion properties of dust, a targeted structural design can be adopted to carry out a zoned protection design for the composite filter element 3. Specifically, the part of the composite filter element 3 closest to the breathing channel is the core breathing area, and the two sides away from the breathing channel are two auxiliary breathing areas. The composite filter element 3 is composed of a metal base layer 4 and a membrane layer 5.

[0037] The metal base layer 4 is made of metal wire mesh with irregularly shaped holes throughout. Several recessed grooves 8 of varying depths are sequentially arranged along the length of the metal base layer 4, extending backwards. When worn, the grooves 8 extend vertically. This invention, by sequentially creating several recessed grooves of varying depths along the length of the metal base layer, significantly increases the filtration area and dust volume within a limited area compared to traditional planar filter materials or filter materials with uniform pleats. This improves filtration efficiency and significantly increases dust holding capacity, extending the effective lifespan of the filter element. Furthermore, the unique geometry of the grooves allows for more even and effective guidance and dispersion of airflow into the pre-filter chamber, enabling more directional changes in airflow as it passes through the filter element. This multi-directional airflow path increases the contact between suspended particles and the filter material surface, thereby improving particle capture efficiency. Simultaneously, the dispersed airflow path reduces pressure concentration at any single point, helping to lower overall breathing resistance and greatly improving user comfort. Furthermore, the grooves of varying depths create additional collision and interception points, making it easier for particulate matter to be disturbed and ultimately captured as it passes through the filter material, thus increasing the success rate of dust capture.

[0038] The membrane layer 5 is adhered to the surface of the front side of the metal base layer 4; the membrane layer 5 is preferably a PTFE microporous membrane. The PTFE microporous membrane has a microporous structure with interlaced fibers and a porosity of 80%–90%. Its unique microporous structure has no through-holes and the pore size is small and uniform, which can effectively intercept dust particles. It has a surface filtration mechanism and good non-adhesive ability. At the same time, as a new type of nanofilter material, the PTFE microporous membrane has many advantages such as high chemical stability, resistance to high and low temperatures, corrosion resistance, weather resistance, high lubricity, good non-adhesion, air permeability, hydrophobicity, good durability, low surface tension, and flexibility. It can easily and effectively remove dust accumulated on the surface, and its filtration performance can be quickly restored by water washing or backflushing. It has a long service life and a filtration efficiency of up to 99.999995%. Therefore, using PTFE microporous membranes as the coating layer can fully utilize their unique microporous structure, allowing only gas to pass through while preventing dust from entering the membrane's interior or substrate through the membrane surface. Simultaneously, processes such as direct retention, collision, Brownian motion, and electret effect can be used to filter and retain dust on the membrane surface, achieving highly efficient separation of dust and gas. Using PTFE microporous membranes for dust filtration not only provides excellent filtration results but also effectively prevents dust adhesion and accumulation, and allows the composite filter element to be washable, effectively extending its service life.

[0039] This invention effectively combines a metal base layer with a membrane layer, making full use of the structural stability of the metal base layer and the low surface tension, water resistance, and special microporous structure of the membrane layer. This gives the composite filter element washability, good antistatic properties, and the ability to be repeatedly tapped to remove dust. Thus, when too much dust accumulates on the filter element, it can be easily removed by washing or tapping, enabling the filter element to be reused multiple times.

[0040] The flow-guiding cleaning pad 6 is installed in the filter box 2 and located behind the composite filter element 3. Several protrusions 7 are distributed across the front surface of the flow-guiding cleaning pad 6, and each protrusion 7 has a conical hole 9 extending along its length at its center, with the smaller end of the conical hole 9 located at the front end. The outer contour of the protrusion 7 can be conical or cylindrical. Making the outer contour of the protrusion conical or cylindrical can provide a certain degree of support and isolation for the composite filter element, thereby forming an airflow buffer chamber between the composite filter element and the flow-guiding cleaning pad body, which facilitates a smoother flow of air into the post-filtration chamber. Preferably, the protrusion 7 is conical, which provides a more stable support effect.

[0041] As a further preferred embodiment, the airflow guiding and dust removal pad 6 is provided with multiple rows of protrusions 7 along its length. The multiple rows of protrusions 7 are arranged one-to-one with several grooves 8 on the metal base layer 4. During assembly, it is ensured that each row of protrusions 7 on the airflow guiding and dust removal pad 6 is aligned with each groove 8 on the composite filter 3. Thus, during the dust removal process, the reverse dust removal airflow can be concentrated on the corresponding groove 8, thereby removing the dust adhering to the composite filter element 3 more efficiently. In addition, through this matching method, during the air intake process, the airflow passing through the groove 8 can flow more directly into the filter chamber through the conical holes 9 in the multiple protrusions 7 in the same row, further reducing breathing resistance and improving comfort during use.

[0042] A guide pad with numerous protrusions is positioned on the rear side of the composite filter element, with a conical hole at the center of each protrusion. The smaller end of the conical hole is positioned at the front. This gradual increase in hole size significantly reduces intake resistance and airflow velocity during inhalation, effectively lowering breathing pressure and resistance. This helps ensure a smoother and more natural breathing process, while the reduced airflow velocity enhances air purification. Furthermore, when airflow passes in the opposite direction, it exits through the smaller end and is then ejected. This gradual narrowing design accelerates the airflow as it passes through the guide layer, creating a jet effect. As the airflow passes through the constricted channel, the internal cross-sectional area decreases, increasing both airflow velocity and pressure. This accelerated and pressurized airflow has a stronger impact force as it passes through the filter element, more effectively flushing and removing particles adhering to the filter media surface. Furthermore, because the airflow-guiding cleaning pad can repeatedly provide jet action, it can repeatedly remove particles accumulated on the filter media. This process not only efficiently removes dust from the filter media surface but also prevents deep penetration and accumulation of particles. It reduces the risk of performance degradation or clogging of the filter media due to particle accumulation, maintaining the high filtration efficiency and permeability of the filter layer. This not only ensures high filtration efficiency during use but also effectively alleviates the problem of increased breathing resistance in the filter layer after prolonged use, reducing the frequency and difficulty of filter maintenance, extending the effective service life of the filter, and ensuring stability and reliability in high-concentration dust workplaces. At the same time, it also enhances the user's comfort experience. This mask has low breathing resistance, excellent wearing comfort, high dust holding capacity, good filtration performance, and a long service life. It can be blown cleaned and washed with water, and can be reused multiple times.

[0043] In order to improve the filtration effect and further increase the dust holding capacity, the plurality of grooves 8 are composed of dust holding filter unit one and dust holding filter unit two arranged alternately in sequence.

[0044] The first dust-collecting filter unit is a single deep groove 10 or multiple continuously distributed deep grooves 10, and the second dust-collecting filter unit is a single shallow groove 11 or multiple continuously distributed shallow grooves 11, wherein the depth of the deep groove 10 is greater than the depth of the shallow groove 11. Preferably, the depths of the deep grooves 10 in the multiple first dust-collecting filter units are the same, and the depths of the shallow grooves 11 in the multiple second dust-collecting filter units are the same. This regularly arranged combination of deep and shallow grooves increases the effective filtration area and dust holding capacity of the filter element, while also improving the overall stability of the filter element. Furthermore, it helps ensure that different areas of the filter element achieve good filtration results.

[0045] To balance the filtration pressure, the coating layer 5 is thicker in the core breathing region than in the auxiliary breathing region. This thicker core region and thinner auxiliary breathing region effectively optimizes the filter element's structure. This variable density gradient design allows for greater airflow resistance in the core breathing region and lower airflow resistance in the auxiliary breathing region during exhalation. When inhalation negative pressure acts on the post-filter chamber, the airflow entering the pre-filter chamber is better dispersed to the auxiliary breathing regions on both sides. This airflow diversion not only reduces overuse and rapid failure of the core breathing region but also ensures more uniform utilization of the entire filter layer. This allows the entire composite filter element to perform effective filtration, achieving zoned purification and reducing overall airflow resistance. This helps ensure that all parts of the filter element reach their service life and replacement deadline simultaneously, avoiding waste. Furthermore, it allows the auxiliary breathing region to more effectively capture dust, significantly improving its utilization efficiency. Therefore, through this variable density gradient design, the present invention optimizes the overall airflow distribution and resistance characteristics of the filter layer while maintaining high-efficiency filtration performance, making it better able to meet the needs of long-term wear and high-efficiency filtration.

[0046] As a further optimization, in order to better achieve the purpose of zoned purification, the membrane layer 5 has an axisymmetric structure, and both halves of it are divided into multiple filtration sections from the respiratory core area to the respiratory auxiliary area, and the thickness of the multiple filtration sections gradually decreases.

[0047] To increase the dust holding capacity of the groove, the cross-section of the groove 8 is trapezoidal or U-shaped, preferably trapezoidal. When the cross-section of the groove 8 is trapezoidal, the opening end of the groove 8 corresponds to the long side of the trapezoid. When the cross-section of the groove is trapezoidal, the groove has an involute structure, which significantly increases the filtration area and volume of a single groove, thereby helping to increase the overall filtration area and volume of the filter element.

[0048] To better balance the filtration pressure, the distribution density of the grooves 8 in the core breathing region is greater than that in the auxiliary breathing region. This higher groove density in the core breathing region and lower density in the auxiliary breathing region further increases airflow resistance in the core breathing region while simultaneously reducing airflow resistance in the auxiliary breathing region. This allows for better airflow dispersion in both auxiliary breathing regions, ensuring more efficient utilization of all parts of the filter element. As a further preferred design, to complement the gradient design of the membrane layer 5, which gradually thins from the core breathing region to the auxiliary breathing region, and to achieve better airflow dispersion and more efficient utilization of each region of the composite filter element 3, the distribution density of the grooves 8 (the spacing between adjacent grooves 8) decreases in a stepwise manner from the core breathing region to the auxiliary breathing region.

[0049] The lateral dimension of the groove 8 located in the core breathing region is larger than that of the groove 8 located in the auxiliary breathing region. Making the lateral dimension of the groove in the core breathing region larger further increases the effective filtration area and effective volume of the filter element in the core breathing region, thereby significantly improving the filtration effect and dust holding capacity of the breathing region and extending the overall service life. As a further preferred option, to optimize filtration efficiency, the lateral dimensions of the multiple grooves 8 decrease in a stepwise manner from the core breathing region to the auxiliary breathing region.

[0050] To ensure that the airflow entering the filter box does not directly enter the filter chamber from the periphery of the composite filter element, the periphery of the composite filter element 3 is sealed to the periphery of the inner cavity of the filter box 2 through sealing component one. To ensure that the airflow can act more effectively on the composite filter element when it passes through in the opposite direction, so as to achieve a more efficient dust removal effect, the periphery of the flow guiding dust removal pad 6 is sealed to the periphery of the composite filter element 3 through sealing component two.

[0051] To facilitate maintenance and replacement of the filter components, the filter box 2 is composed of a front housing 12 and a rear housing 13 that are interlocked. This interlocking assembly method facilitates the assembly and disassembly of the front housing 12 and the rear housing 13. Alternatively, screw holes can be provided at the edges where the front housing 12 and the rear housing 13 connect, and bolts can be used to securely connect the front housing 12 and the rear housing 13.

[0052] The front housing 12 is provided with an air inlet groove 14 that communicates with the pre-filter chamber. As a further preferred embodiment, the area of ​​the air inlet groove 14 extends from the core breathing area to the breathing assistance area. The area of ​​the air inlet groove 14 is generally elliptical or rectangular, which makes the area of ​​the air inlet groove 14 larger, which can further reduce the air intake resistance, further reduce the breathing resistance, and improve the comfort of the wearer.

[0053] The upper part of the rear side of the rear housing 13 is fixedly connected to an air passage connector 15 that communicates with the filter chamber. As a further preferred embodiment, the air passage connector 15 is located in the central area of ​​the width direction of the filter box 2, and the air passage connector 15 is a breathing channel between the filter box 2 and the mask body 1. By connecting the air passage connector 1 to the rear housing, it is not only easy to establish a connection air passage between the filter box and the mask body, but also during the dust removal process, the air passage connector 1 can be used to directly blow the dust removal airflow into the filter chamber, which makes it easy to achieve efficient removal of dust attached to the composite filter element.

[0054] The lower part of the mask body 1 is provided with an air outlet 17, and a breathing valve 18 is installed in the air outlet 17; the upper part of the mask body 1 is provided with an air inlet 19, and an inhalation valve 20 is installed in the air inlet 19. At the same time, the mask body 1 is connected to the front side of the air passage connector 2 16, which is connected to the air inlet 19. The air passage connector 2 16 is compatible with the air passage connector 15. The mask body 1 is connected to the filter box 2 through the interconnected air passage connector 2 16 and air passage connector 15.

[0055] To facilitate quick assembly and disassembly between the mask body and the filter box, the cross-sections of the air connector 15 and the air connector 16 are both circular or elliptical, and they are connected by a fitting.

[0056] As a further preferred option, the perimeter of the opening of the face mask body 1 is made of silicone material. This allows the face mask body 1 to fit the face more closely, improving wearing comfort while ensuring a tight seal during protection. Two symmetrical ear loops 21 can be provided on both sides of the face mask body 1 for securing the wearing strap or elastic band. This secure design ensures that the face mask body 1 is stably connected to the wearer's face.

Claims

1. A high-efficiency, low-resistance dustproof face mask for mining, comprising a face mask body (1) and a filter box (2), wherein the filter box (2) is connected to the face mask body (1), characterized in that, It also includes a composite filter element (3) and a flow-guiding dust removal pad (6); The composite filter element (3) is installed in the filter box (2) and the inner cavity of the filter box (2) is isolated into a pre-filtration chamber and a post-filtration chamber; the composite filter element (3) is composed of a metal base layer (4) and a membrane layer (5); The metal base layer (4) is made of metal wire mesh, and irregular mesh holes are distributed throughout the mesh body; the metal base layer (4) is provided with a number of recessed grooves (8) along the length direction, and the recessed depth of the number of grooves (8) is different. The coating layer (5) is a PTFE microporous membrane, and the coating layer (5) is attached to the surface of the front side of the metal base layer (4); The flow-guiding cleaning pad (6) is installed in the filter box (2) and is located on the rear side of the composite filter element (3); the front side of the flow-guiding cleaning pad (6) is provided with a number of protrusions (7) all over its surface, and each protrusion (7) has a conical hole (9) that runs through its length direction in the center, wherein the small end of the conical hole (9) is located at the front end; The thickness of the coating layer (5) in the respiratory core region is greater than that in the respiratory support region. The cross-section of the groove (8) is trapezoidal or U-shaped. When the cross-section of the groove (8) is trapezoidal, the opening end of the groove (8) corresponds to the long side of the trapezoid. The distribution density of multiple grooves (8) in the respiratory core region is greater than that of multiple grooves (8) in the respiratory support region.

2. The high-efficiency, low-resistance dustproof face mask for mining according to claim 1, characterized in that, The plurality of grooves (8) are composed of dust-collecting filter unit one and dust-collecting filter unit two arranged alternately in sequence; The first dust-collecting filter unit is a deep groove (10) or a plurality of deep grooves (10) distributed continuously, and the second dust-collecting filter unit is a shallow groove (11) or a plurality of shallow grooves (11) distributed continuously.

3. The high-efficiency, low-resistance dustproof face mask for mining according to claim 1, characterized in that, The lateral dimension of the groove (8) located in the respiratory core region is larger than that of the groove (8) located in the respiratory support region.

4. The high-efficiency, low-resistance dustproof face mask for mining according to claim 1, characterized in that, The outer contour of the protrusion (7) is conical or cylindrical.

5. A high-efficiency, low-resistance dustproof face mask for mining according to claim 1, characterized in that, The periphery of the composite filter element (3) is sealed to the periphery of the inner cavity of the filter box (2) through sealing component one, and the periphery of the flow-guiding dust removal pad (6) is sealed to the periphery of the composite filter element (3) through sealing component two.

6. A high-efficiency, low-resistance dustproof face mask for mining according to claim 1, characterized in that, The filter box (2) is a laterally extending arc-shaped structure, which is composed of a front shell (12) and a rear shell (13) that are fastened together. An air inlet groove (14) communicating with the pre-filter chamber is provided on the front housing (12). The upper part of the rear side of the rear housing (13) is fixedly connected to an air passage connector (15) that communicates with the filter chamber. The lower part of the mask body (1) is provided with an air outlet (17) and a breathing valve (18) is installed in the air outlet (17); the upper part of the mask body (1) is provided with an air inlet (19) and an inhalation valve (20) is installed in the air inlet (19). At the same time, the mask body (1) is connected to the front side of the air passage connector two (16) which is connected to the air inlet (19). The air passage connector two (16) is compatible with the air passage connector one (15). The mask body (1) is connected to the filter box (2) through the interconnected air passage connector two (16) and air passage connector one (15).

7. A high-efficiency, low-resistance dustproof face mask for mining according to claim 6, characterized in that, The cross-sections of the first gas connector (15) and the second gas connector (16) are both circular or elliptical, and they are connected by a fitting.

Images