A high-efficiency low-resistance respirator for high temperature, high humidity and high dust environment in a coal mine underground

Abstract

The application provides a high-efficiency low-resistance respirator for a high-temperature, high-humidity and high-dust environment in a coal mine underground, which comprises a respirator mask, an air inlet and an air outlet, a filter device, a shell, the shell being installed on the respirator mask, an air inlet and an air outlet being arranged on the shell, the air outlet being communicated with the air inlet, a pre-filtering assembly, a coarse filtering assembly, a medium filtering assembly, a dust cleaning assembly and a fine filtering assembly being installed in the shell in sequence from the air inlet to the air outlet, and two temperature control boxes being symmetrically installed on two sides of the shell, wherein the respirator realizes efficient purification of dust through a multi-stage filtering mode, and the air is cooled by a cooling device, so that the comfort of the wearer is improved. The respirator has the advantages of high dust-settling efficiency, simple structure, convenient use, good dust cleaning effect, convenient maintenance and the like, and is especially suitable for being worn by a worker in a high-temperature, high-humidity and high-dust environment in a coal mine underground.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of dust prevention and control, in particular to a high-efficiency low-resistance respirator for high-temperature, high-humidity and high-dust environment in underground coal mines. BACKGROUND

[0002] In the process of mining, a large amount of harmful substances, including dust, toxic gases, and chemical substances, are produced, which pose a serious potential threat to the health of workers. In such a severe working environment, the use of mine respirators becomes particularly important. Mine respirators use high-efficiency filtration materials that can effectively filter dust and smoke in the air, thereby protecting the respiratory health of miners. By wearing such professionally designed respirators, miners can greatly reduce the risk of inhaling harmful substances, protecting their lungs and overall health. Mine respirators are not only an important part of personal protective equipment, but also an indispensable part of mine safety production management, providing a solid guarantee for the safety and health of miners. Although mine respirators can provide protection to some extent, there are still some shortcomings:

[0003] Low comfort: In some coal mines where heat damage is more serious, mine workers are in a high-temperature and high-humidity environment for a long time, and after long-term inhalation of high-temperature gas, it is easy to cause harm to the health of mine workers, and also can lead to a decrease in the work efficiency of mine workers.

[0004] Frequent replacement: Mine respirators need to be replaced frequently after a period of use because the filtration material gradually loses its effectiveness, which increases the use and maintenance costs of miners. SUMMARY

[0005] In view of the above technical deficiencies, the purpose of the present application is to provide a high-efficiency low-resistance respirator for high-temperature, high-humidity and high-dust environment in underground coal mines, which can improve the dust reduction effect of dust in the mine and improve the comfort of the wearer, protecting the occupational health of the wearer.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] A high-efficiency low-resistance respirator for high-temperature, high-humidity and high-dust environment in underground coal mines, comprising:

[0008] A respirator mask is configured with an air inlet and an air outlet;

[0009] A filter device includes a housing; the housing is installed on the respirator mask; the housing is provided with an air inlet and an air outlet, and the air outlet is in communication with the air inlet; the inside of the housing is sequentially installed with a pre-filter assembly, a coarse filter assembly, a medium filter assembly, a dust cleaning assembly, and a fine filter assembly from the air inlet to the air outlet; the dust cleaning assembly is movably installed on the housing and frictionally contacts the fine filter assembly on one side, and the fine filter assembly is cleaned by the dust cleaning assembly;

[0010] The temperature control box is configured with two, symmetrically installed on both sides of the shell; the temperature control box is connected with the fine filter assembly, used for cooling the inside of the shell.

[0011] Preferably, a rubber pad is installed on the respirator mask where it is in contact with the wearer's face; a wearing buckle is fixedly arranged on both sides of the respirator mask; a soft rubber sealing pad is installed at the air inlet and the air outlet.

[0012] Preferably, the pre-filter assembly comprises a pre-filter plate; the middle part of the pre-filter plate is provided with an opening, and a plurality of horizontally arranged stainless steel wires are installed in the opening; the plurality of stainless steel wires are arranged in an equidistant array in a vertical plane; the diameter of the stainless steel wire is 0.1-0.5mm; the spacing between adjacent two stainless steel wires ranges from 40-50μm; the surface of the stainless steel wire is plated with water-washable glue.

[0013] Preferably, the coarse filter assembly comprises a coarse filter plate; the middle part of the coarse filter plate is provided with an opening; one stainless steel metal filter screen I is installed at each end of the opening; an adsorption ball I with a thickness of 5mm is filled between the two stainless steel metal filter screens I; the diameter of the adsorption ball I is 150-200μm; the surface of the adsorption ball I is provided with a plurality of holes with a diameter ranging from 0.5-40μm, and the pore size distribution is configured as: holes with a diameter of 0.5-5μm account for 50%, holes with a diameter of 5-10μm account for 30%, holes with a diameter of 10-20μm account for 10%, holes with a diameter of 20-30μm account for 6%, and holes with a diameter of 30-40μm account for 4%; the material of the adsorption ball I is 50% glass and 50% polytetrafluoroethylene; a gap is left between the adsorption ball I and the stainless steel metal filter screen I, and the vibration generated when walking causes the adsorption balls I to rub against each other and carry electric charges; when the dust is electrically neutral, the electrostatic collection efficiency of the adsorption ball I on the dust is:

[0014]

[0015] In the formula: η is the electrostatic collection efficiency, %;

[0016] Q is the charge amount on the adsorption ball I, C;

[0017] is the dielectric constant of the dust;

[0018] μ is the gas viscosity, Pa·s;

[0019] ε is the dielectric constant of free space;

[0020] v is the gas characteristic velocity, m / s;

[0021] r is the diameter of the dust, m;

[0022] R is the diameter of the adsorption ball I, m;

[0023] δ is a correction coefficient.

[0024] Preferably, the middle-stage filtering assembly comprises a middle-stage filtering plate; the middle part of the middle-stage filtering plate is provided with an opening; each end of the opening is provided with a stainless steel metal filter screen II; the two stainless steel metal filter screens II are filled with 5 mm thick adsorption balls II; the diameter of the adsorption balls II is 85-150 μm; the adsorption balls II are consistent with the adsorption ball I in surface pore size distribution and material.

[0025] Preferably, the fine-stage filtering assembly comprises a fine-stage filtering net; the fine-stage filtering net comprises a pleated high-efficiency filter material and a temperature control net; the temperature control net is installed inside the pleated high-efficiency filter material; the pleated high-efficiency filter material is made of polytetrafluoroethylene, and the pleat coefficient is 1.15-1.59; the temperature control net is a 2-8 mesh metal copper net, and the metal diameter is 1-1.5 mm.

[0026] Preferably, the temperature control box is a rectangular hollow structure, and the inner wall is attached with a heat preservation layer; the inner wall of the heat preservation layer is attached with a heat conduction plate, and the material of the heat conduction plate is metal copper; the inside of the heat conduction plate is detachably placed with a copper box, and the copper box is provided with a coolant; the temperature control box is installed with a top cover; the top cover is fixedly provided with a magnet II, and the temperature control box is fixedly provided with a magnet I matched with the magnet II; when the top cover is buckled on the temperature control box, the magnet I and the magnet II are attracted; the two ends of the temperature control net are respectively connected with the heat conduction plates inside the two temperature control boxes.

[0027] Preferably, the inside of the ash removal assembly is a hollow structure, and a partition plate is fixedly arranged vertically inside; the partition plate divides the inside of the ash removal assembly into a gas compression chamber and a gas outlet chamber, and the gas outlet chamber is close to the fine-stage filtering assembly; a side plate is arranged on one side of the ash removal assembly close to the fine-stage filtering assembly; a square air hole is arranged in the center of the partition plate; the air hole communicates the gas compression chamber and the gas outlet chamber; two rows of gas outlet holes are opened on the side plate, and a bristle brush is installed on the outer side wall of the side plate and faces the pleated high-efficiency filter material; a compressible spring is installed in the gas compression chamber, and the two sides of the compressible spring are respectively connected with sealing baffles; two pressing handles are symmetrically and slidably installed on the ash removal assembly; one end of the pressing handle extends into the gas compression chamber and is fixedly connected with the pressing handle; the shell is provided with a vertical groove in the up-down direction, and the pressing handle is movably arranged in the vertical groove; a flexible pleated rubber sealing gasket is installed on the inner wall of the vertical groove and is used for sealing during the up-down movement and compression of the pressing handle.

[0028] Preferably, the filtering device further comprises an upper top plate, and the upper top plate is buckled and installed on the shell; the pre-filtering assembly, the coarse-stage filtering assembly, the middle-stage filtering assembly and the fine-stage filtering assembly are fixed on the upper top plate; the shell is provided with jacks matched with the pre-filtering assembly, the coarse-stage filtering assembly, the middle-stage filtering assembly, the ash removal assembly and the fine-stage filtering assembly.

[0029] Compared with the prior art, the present application has the following advantages:

[0030] The respirator of the present application has the advantages of simple wearing, high comfort, easy replacement and cleaning, etc. The hierarchical filtering method can effectively reduce the accumulation of dust on the surface of the fine filtering assembly, thereby greatly reducing the filtering resistance and overcoming the defects of large breathing resistance of traditional respirators and discomfort of long-term wearing by workers. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a schematic diagram of the overall structure of the present application;

[0032] Figure 2 is a schematic diagram of the rear view structure of the present application;

[0033] Figure 3 is a schematic diagram of the pre-filtering assembly in the present application;

[0034] Figure 4 is a schematic diagram of the coarse filtering assembly in the present application;

[0035] Figure 5 is a schematic diagram of the intermediate filtering assembly in the present application;

[0036] Figure 6 is a schematic diagram of the fine filtering assembly in the present application;

[0037] Figure 7 is a schematic diagram of the temperature control box in the present application;

[0038] Figure 8 is a schematic diagram of the box cover of the temperature control box in the present application;

[0039] Figure 9 is a schematic diagram of the dust cleaning assembly in the present application;

[0040] Figure 10 is a schematic diagram of the movement of the dust cleaning assembly in the present application;

[0041] Figure 11 is a test result diagram of the filtering resistance of the present application;

[0042] Figure 12 is Figure 4 is a partial enlarged view of position A in FIG. 1;

[0043] Figure 13 is Figure 5 is a partial enlarged view of position B in FIG. 1;

[0044] Figure 14 is Figure 6 is a sectional structure diagram of direction H-H in FIG. 1;

[0045] Figure 15 is Figure 7 is a local enlarged view at C in Fig. 1;

[0046] Figure 16 is a schematic view of a cross-sectional structure of the ash cleaning assembly of the present application.

[0047] wherein:

[0048] 1. Respirator mask, 11. Rubber pad, 12. Wearing buckle, 13. Air inlet, 14. Air outlet, 2. Filtering device, 3. Pre-filtering assembly, 31. Stainless steel wire, 4. Coarse filtering plate, 41. Stainless steel metal filter screen I, 42. Adsorption ball I, 5. Intermediate filtering plate, 51. Stainless steel metal filter screen II, 52. Adsorption ball II, 6. Fine filtering assembly, 61. Pleated high-efficiency filter material, 62. Temperature control net, 7. Temperature control box, 71. Heat preservation layer, 72. Heat conduction plate, 73. Copper box, 74. Temperature control box top cover, 75. Magnet I, 76. Magnet II, 8. Ash cleaning device, 81. Air compression chamber, 82. Air outlet chamber, 83. Partition, 84. Vent hole, 85. Side plate, 851. Hard bristle brush, 86. Air outlet small hole, 87. Compressible spring, 88. Sealing baffle, 89. Pressing handle, 810. Flexible pleated rubber sealing pad, 9. Upper top plate. DETAILED DESCRIPTION

[0049] The present application will be further described below in conjunction with the accompanying drawings.

[0050] As Figure 1 , Figure 2 shown in the drawings, an efficient low-resistance respirator for use in a high-temperature, high-humidity and high-dust environment in a coal mine underground includes:

[0051] The respirator mask 1 is provided with an air inlet 13 and an air outlet 14.

[0052] The filtering device 2 includes a housing; the housing is mounted on the respirator mask 1; the housing is provided with an air inlet and an air outlet, and the air outlet is in communication with the air inlet 13; the housing is internally provided, in sequence from the air inlet to the air outlet, with a pre-filtering assembly, a coarse filtering assembly, an intermediate filtering assembly, an ash cleaning assembly and a fine filtering assembly 6; the ash cleaning assembly is movably mounted on the housing and in frictional contact with the fine filtering assembly on one side, so as to clean the fine filtering assembly through the ash cleaning assembly;

[0053] The temperature control box 7 is provided with two and symmetrically mounted on both sides of the housing; the temperature control box 7 is connected with the fine filtering assembly and used for cooling the interior of the housing.

[0054] In the embodiment, a rubber pad 11 is installed on the respirator mask 1 to fit the face of the wearer; a wearing buckle 12 is fixed on both sides of the respirator mask 1 for the wearer to tie a wearing rope; a soft rubber sealing pad is installed at the air inlet 13 and the air outlet 14.

[0055] In the embodiment, as shown in Figure 3 , the pre-filter assembly includes a pre-filter plate 3; the middle part of the pre-filter plate 3 is provided with an opening, and a plurality of horizontally arranged stainless steel wires 31 are installed in the opening; the plurality of stainless steel wires 31 are arranged at equal intervals in a vertical plane; the diameter of the stainless steel wire 31 is 0.1-0.5mm; the spacing between two adjacent stainless steel wires 31 ranges from 40-50μm; the surface of the stainless steel wire 31 is plated with water-washable glue, which can adhere to and intercept large-particle-size dust, and pre-filter the dust-containing airflow entering the respirator.

[0056] In the embodiment, as shown in Figure 4 , Figure 12 , the coarse-level filter assembly includes a coarse-level filter plate 4; the middle part of the coarse-level filter plate 4 is provided with an opening; one stainless steel metal filter screen I 41 is installed at each end of the opening; a plurality of adsorption balls I 42 with a thickness of 5mm are filled between the two stainless steel metal filter screens I 41; the diameter of the adsorption ball I 42 is 150-200μm; the surface of the adsorption ball I 42 is provided with a plurality of holes with a diameter ranging from 0.5-40μm, and the pore size distribution is configured as follows: 50% of the holes with a diameter of 0.5-5μm, 30% of the holes with a diameter of 5-10μm, 10% of the holes with a diameter of 10-20μm, 6% of the holes with a diameter of 20-30μm, and 4% of the holes with a diameter of 30-40μm; 50% of the adsorption balls I 42 are made of glass, and 50% of the adsorption balls I 42 are made of polytetrafluoroethylene; there is a gap between the adsorption balls I 42 and the stainless steel metal filter screen I 41, and the vibration generated during walking causes the adsorption balls I 42 to rub against each other and carry electric charges; assuming that the amount of electric charge carried by the adsorption ball I 42 is Q, when the dust is electrically neutral, the electrostatic capture efficiency of the adsorption ball I 42 to the dust is:

[0057]

[0058] In the formula: η is the electrostatic capture efficiency, %;

[0059] Q is the amount of electric charge on the adsorption ball I, C;

[0060] εr is the dielectric constant of the dust;

[0061] μ is the gas viscosity, Pa·s;

[0062] ε0 is the dielectric constant of free space;

[0063] v is the gas characteristic velocity, m / s;

[0064] r is the diameter of the dust particle, in meters;

[0065] R is the diameter of adsorption sphere I, in meters;

[0066] δ is the correction factor.

[0067] In this embodiment, as Figure 5 , Figure 13 As shown, the intermediate filtration assembly includes an intermediate filter plate 5; an opening is provided in the middle of the intermediate filter plate 5; a stainless steel metal filter screen II 51 is installed at each end of the opening; a 5mm thick adsorption ball II 52 is filled between the two stainless steel metal filter screens II 51; the diameter of the adsorption ball II 52 is 85-150μm; the surface pore size distribution and material of the adsorption ball II 52 are the same as those of the adsorption ball I 42.

[0068] In this embodiment, as Figure 6 , Figure 14 As shown, the fine-stage filtration assembly 6 includes a fine-stage filter screen; the fine-stage filter screen includes a pleated high-efficiency filter media 61 and a temperature-controlling mesh 62; the temperature-controlling mesh 62 is installed inside the pleated high-efficiency filter media 61; the pleated high-efficiency filter media 61 is made of polytetrafluoroethylene, with a pleat coefficient (the ratio of pleat height to pleat spacing) of 1.15-1.59, and can achieve a dust reduction efficiency of greater than 99.9%; the temperature-controlling mesh 62 is a 2-8 mesh copper mesh with a metal diameter of 1-1.5 mm, and has good thermal conductivity.

[0069] In this embodiment, as Figure 7 , Figure 15 , Figure 8 As shown, the temperature control box 7 is a rectangular hollow structure with an insulation layer 71 attached to its inner wall; a heat-conducting plate 72 is attached to the inner wall of the insulation layer 71, and the heat-conducting plate 72 is made of copper; a copper box 73 is detachably placed inside the heat-conducting plate 72, and a coolant is placed inside the copper box 73; a top cover is installed on the temperature control box 7; a magnet II 76 is fixedly installed on the top cover, and a magnet I 75 that matches the magnet II 76 is fixedly installed on the temperature control box 7; when the top cover is fastened to the temperature control box 7, the magnet I 75 and the magnet II 76 attract each other, which facilitates the replacement of the copper box 73; the two ends of the temperature control mesh 62 are respectively connected to the heat-conducting plates 72 inside the two temperature control boxes 7.

[0070] In this embodiment, as Figure 9 , Figure 16 , Figure 10As shown, the inside of the ash removal assembly is a hollow structure, a partition plate 83 is fixed vertically inside, the inside of the ash removal assembly is divided into a compression chamber 81 and an outlet chamber 82 by the partition plate 83, the outlet chamber 82 is close to the fine filter assembly 6; a side plate 85 is arranged on one side of the ash removal assembly close to the fine filter assembly 6; a square air hole 84 is arranged in the center of the partition plate 83; the air hole 84 connects the compression chamber 81 and the outlet chamber 82; two rows of outlet small holes 86 are opened on the side plate 85, a hard hair brush 851 is installed on the outer side wall surface of the side plate 85 and faces the pleated high-efficiency filter material 61; a compressible spring 87 is installed in the compression chamber 81, and a sealing baffle 88 is connected to the two sides of the compressible spring 87; two pressing handles 89 are symmetrically installed on the ash removal assembly and can slide; one end of the pressing handle 89 extends into the compression chamber 81 and is fixedly connected with the pressing handle 89; a straight groove in the up-down direction is opened on the shell, and the pressing handle 89 is movably arranged in the straight groove; when the pressing handle 89 is pressed inward, the two sealing baffles 88 are close to each other, so that the compressible spring is compressed, and the gas between the two sealing baffles 88 is discharged from the air hole 84 through the outlet chamber 82 and the outlet small hole 86; a flexible pleated rubber sealing gasket 810 is installed at the inner wall of the straight groove, which is used for sealing during the up-down movement and compression of the pressing handle 89.

[0071] In the embodiment, the filter device 2 further comprises an upper top plate 9, the upper top plate 9 is snap-fitted on the shell; the pre-filter assembly, the coarse filter assembly, the medium filter assembly and the fine filter assembly are fixed on the upper top plate 9; the shell is provided with a jack that is matched with the pre-filter assembly, the coarse filter assembly, the medium filter assembly, the ash removal assembly and the fine filter assembly.

[0072] Before the wearer uses, the copper box 73 needs to be cooled down, and after it is cooled down to the required temperature, the copper box 73 is respectively placed in the temperature control box 7, and the top cover of the temperature control box 7 is covered. When the wearer works, the dust-containing airflow enters the respirator under the action of the wearer's breathing, first passes through the pre-filter plate 3. The surface of the stainless steel wire 31 of the pre-filter plate 3 is plated with water-washable glue, which can adhere to and intercept large-particle dust, and preliminarily filter the dust-containing airflow. In the process of the wearer's movement, the respirator will vibrate, so that the adsorption balls I 42 and the adsorption balls II 52 in the coarse filter plate 4 and the medium filter plate 5 collide and rub to carry electric charges, further intercept dust in the air by using electrostatic adsorption, so that the dust-containing airflow is purified. Further, the fine filter assembly 6 purifies the air to reach a clean level for human respiration. Subsequently, the clean air passes through the temperature control net 62, and heat exchange is performed on the surface thereof, so that the heat of the clean air is transmitted to the temperature control box 7 through the temperature control net 62, the temperature of the clean air is reduced to reach a comfortable temperature for human respiration, and finally, the clean air enters the air inlet 13 and is used for the wearer to breathe.

[0073] After a period of use, a certain amount of dust will accumulate on the fine filter assembly 6, increasing breathing resistance and reducing wearer comfort. At this time, the wearer needs to manually press the handle 89 to move the cleaning assembly up and down, using the stiff brush 851 and the blower to remove the accumulated dust from the fine filter assembly 6, thus reducing breathing resistance. After use, the wearer can remove the pre-filter assembly, coarse filter assembly, intermediate filter assembly, and fine filter assembly 6, and remove the collected dust particles by vibration or water rinsing, thereby maintaining the cleanliness and filtration effect of the respirator. At the same time, the copper box 73 should be removed and cooled again for the next use.

[0074] This invention's respirator employs a graded filtration approach. By filtering dust particles of different sizes in stages, it helps improve the respirator's filtration efficiency, reduce filtration resistance, decrease breathing resistance for workers, and improve worker comfort. The dust reduction efficiency and filtration resistance of this respirator were tested. The dust reduction efficiency test results are shown in Table 1, and the filtration resistance test results are as follows: Figure 11 As shown:

[0075] Table 1. Test results of dust reduction efficiency of respirators

[0076]

[0077] Table 1 shows that the respirator achieved a filtration efficiency of over 99.98% during use, demonstrating excellent dust filtration performance. And from... Figure 11 The filtration resistance analysis shows that, under the condition of only the fine filter element 6, the filtration resistance increases rapidly with increasing dust loading time. However, for the respirator of this invention, while the filtration resistance also increases with increasing dust loading time, the increase is much smaller than under the condition of only the fine filter element 6. This indicates that the respirator of this invention, through its tiered filtration method, can effectively reduce the amount of dust accumulated on the surface of the fine filter element 6, thereby significantly reducing the filtration resistance and overcoming the shortcomings of traditional respirators, such as high breathing resistance and discomfort for workers during prolonged wear.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A kind of high-efficiency low-resistance respirator for high temperature and high humidity and high dust environment in underground coal mine, it is characterized by, The utility model relates to a kind of filter device and respirator mask, including: Respirator mask (1) is configured with air inlet (13) and air outlet (14); Filtering device (2) includes shell;Shell is mounted on respirator mask (1);Shell is provided with air inlet and air outlet, and air outlet is communicated with air inlet (13);The inside of shell is sequentially mounted with pre-filtering assembly, coarse filter assembly, middle filter assembly, ash cleaning assembly and fine filter assembly (6) from the direction of air inlet to air outlet;Ash cleaning assembly is movably mounted on shell, one side is frictional contact with fine filter assembly (6), and fine filter assembly (6) is cleaned by ash cleaning assembly; Temperature control box (7) is configured with two, and symmetrically installed on both sides of shell;Temperature control box (7) is connected with fine filter assembly (6), for cooling the inside of shell; The coarse filter assembly includes a coarse filter plate (4);The middle part of the coarse filter plate (4) is provided with an opening;Each of the two ends of the opening is provided with a stainless steel metal filter screen I (41);The two stainless steel metal filter screens I (41) are filled with adsorption balls I (42) with a thickness of 5 mm;The diameter of the adsorption balls I (42) is 150-200 μm; The surface of the adsorption balls I (42) is provided with a plurality of holes, the diameter of the holes ranges from 0.5 to 40 μm, and the pore size distribution is configured as follows: 50% of the holes have a diameter of 0.5-5 μm, 30% have a diameter of 5-10 μm, 10% have a diameter of 10-20 μm, 6% have a diameter of 20-30 μm, and 4% have a diameter of 30-40 μm;The material of the adsorption balls I (42) is 50% glass and 50% polytetrafluoroethylene;There is a gap between the adsorption balls I (42) and the stainless steel metal filter screen I (41), and the vibration generated during walking causes the adsorption balls I (42) to rub against each other and carry electric charges;When the dust is electrically neutral, the electrostatic collection efficiency of the adsorption balls I (42) for dust is: wherein: is the electrostatic collection efficiency; C is the charge on the adsorbing sphere I; dielectric constant of the dust; for gas viscosity, ; is the permittivity of free space; Vg = gas characteristic velocity, m / s; Dust diameter, m; Diameter of adsorbing ball I, m; is a correction factor.

2. The high efficiency low resistance respirator for high temperature, high humidity and high dust environment in underground coal mine of claim 1, wherein, The respirator mask (1) is provided with a rubber pad (11) at the part that fits the face of the wearer;The respirator mask (1) is provided with a wearing buckle (12) on both sides;The air inlet (13) and the air outlet (14) are provided with soft rubber sealing pads.

3. The high-efficiency low-resistance respirator for high temperature, high humidity and high dust environment in underground coal mine of claim 1, characterized in that, The pre-filtering assembly includes a pre-filtering plate (3);The middle part of the pre-filtering plate (3) is provided with an opening, and a plurality of horizontally arranged stainless steel wires (31) are installed in the opening;The plurality of stainless steel wires (31) are arranged in an equidistant array in a vertical plane; The diameter of the stainless steel wire (31) is 0.1-0.5 mm;The distance between the two adjacent stainless steel wires (31) ranges from 40 to 50 μm;The surface of the stainless steel wire (31) is plated with a water-washable glue.

4. The high-efficiency low-resistance respirator for high temperature, high humidity and high dust environment in underground coal mine of claim 1, characterized in that, The middle filter assembly includes a middle filter plate (5);The middle part of the middle filter plate (5) is provided with an opening, and each of the two ends of the opening is provided with a stainless steel metal filter screen II (51);The two stainless steel metal filter screens II (51) are filled with 5 mm thick adsorption balls II (52);The diameter of the adsorption balls II (52) is 85-150 μm. The adsorption ball II (52) has the same surface pore size distribution and material as the adsorption ball I (42).

5. The high efficiency low resistance respirator for high temperature, high humidity and high dust environment in underground coal mine of claim 1, wherein, The fine filtering assembly (6) comprises a fine filtering screen; the fine filtering screen comprises a pleated high-efficiency filter material (61) and a temperature control screen (62), the temperature control screen (62) is installed inside the pleated high-efficiency filter material (61); the pleated high-efficiency filter material (61) is made of polytetrafluoroethylene, and the pleat coefficient is 1.15-1.59; the temperature control screen (62) is a 2-8 mesh copper screen, and the metal diameter is 1-1.5 mm.

6. The high efficiency low resistance respirator for high temperature, high humidity and high dust environment in underground coal mine of claim 5, wherein, The temperature control box (7) is a rectangular hollow structure, and an inner wall is attached with a heat preservation layer (71); the inner wall of the heat preservation layer (71) is attached with a heat conduction plate (72), and the material of the heat conduction plate (72) is copper; the heat conduction plate (72) is detachably placed with a copper box (73) inside, and the copper box (73) is provided with a coolant; the temperature control box (7) is installed with a top cover; the top cover is fixedly provided with a magnet II (76), and the temperature control box (7) is fixedly provided with a magnet I (75) matched with the magnet II (76); when the top cover is buckled on the temperature control box (7), the magnet I (75) and the magnet II (76) are attracted; the two ends of the temperature control screen (62) are connected with the heat conduction plates (72) inside the two temperature control boxes (7) respectively.

7. The high efficiency low resistance respirator for high temperature, high humidity and high dust environment in underground coal mine of claim 1, wherein, The inside of the ash removal assembly is a hollow structure, and a partition plate (83) is fixedly arranged vertically inside, which divides the inside of the ash removal assembly into a gas compression chamber (81) and a gas outlet chamber (82), and the gas outlet chamber (82) is close to the fine filtering assembly (6); a side plate (85) is arranged on one side of the ash removal assembly close to the fine filtering assembly (6); a square air hole (84) is arranged in the center of the partition plate (83); the air hole (84) connects the gas compression chamber (81) and the gas outlet chamber (82); two rows of gas outlet holes (86) are opened on the side plate (85), and a hard-bristle brush (851) is installed on the outer side wall of the side plate (85) and faces the pleated high-efficiency filter material (61); a compressible spring (87) is installed in the gas compression chamber (81), and the two sides of the compressible spring (87) are connected with sealing baffles (88) respectively; two pressing handles (89) are symmetrically and slidably installed on the ash removal assembly; one end of the pressing handle (89) extends into the gas compression chamber (81) and is fixedly connected with the pressing handle (89); the shell is opened with a vertical groove in the upward and downward directions, and the pressing handle (89) is movably arranged in the vertical groove; a flexible pleated rubber sealing gasket (810) is installed on the inner wall of the vertical groove, which is used for sealing during the upward and downward movement and compression of the pressing handle (89).

8. The high efficiency low resistance respirator for high temperature, high humidity and high dust environment in underground coal mine of claim 1, wherein, The filtering device (2) further comprises an upper top plate (9) which is buckled and installed on the shell; the pre-filtering assembly, the coarse filtering assembly, the medium filtering assembly and the fine filtering assembly (6) are fixed on the upper top plate (9); the shell is provided with jacks matched with the pre-filtering assembly, the coarse filtering assembly, the medium filtering assembly, the ash removal assembly and the fine filtering assembly (6).

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