An air purification filter

Abstract

The present application provides an air purification filter screen. The air purification filter screen includes a HEPA filter screen and a polymer adsorption filter screen. The polymer adsorption filter screen is formed by stacking multiple layers of grids along its thickness direction; the grids of each layer of grid include a first grid filled with an adsorption material and a second grid not filled with an adsorption material. The grid filling ensures the filling uniformity while ensuring the porosity of each grid, thereby playing a role in reducing the pressure drop.

Description

Technical Field

[0001] The present application relates to the field of air purification, and particularly to an air purification filter screen. Background Art

[0002] Currently, in addition to filtering PM2.5, the commonly used air filters also use activated carbon adsorption to remove formaldehyde, toluene and other VOCs. The PM2.5 and various VOCs that the existing air filters can remove are limited. There are also some products in the market that use plasma or catalysis to remove VOCs, but the overall effect is unstable, and new organic or inorganic substances are generated during the degradation of VOCs. For example, plasma decomposition of hydrocarbon organic matter produces CO by-products. Summary of the Invention

[0003] In order to solve the above problems, an embodiment of the present application provides an air purification filter screen, which includes a HEPA filter screen and a polymer adsorption filter screen. The polymer adsorption filter screen is stacked by multiple layers of grids along its thickness direction; each layer of grid includes a first grid filled with an adsorption material and a second grid not filled with an adsorption material.

[0004] The grids of each layer of grid in the present application include a first grid filled with an adsorption material and a second grid not filled with an adsorption material. Each layer of grid in the present application can be a grid plate composed of multiple hollow grids.

[0005] The grids in the present application can be connected to a fixed filter screen to fix the adsorption material. For example, the upper and lower surfaces of the grid in the present application along the thickness direction are respectively fixedly connected to a first fixed filter screen and a second fixed filter screen. The first fixed filter screen is connected to the upper surface of the grid, and the second fixed filter screen is connected to the lower surface of the grid. The above fixed connection can be carried out by existing methods such as snap connection.

[0006] As an embodiment, the pore diameters of the first fixed filter screen and the second fixed filter screen are both smaller than the minimum particle size of the adsorption material.

[0007] The polymer adsorption filter screen in the present application is filled in a grid manner, which can ensure the filling uniformity and the porosity of each grid, thereby reducing the pressure drop by at least 50%. As an embodiment, the porosity of the first grid is 58-72%. If the porosity is too small, the pressure drop during operation is too large; on the contrary, if the porosity is too large, the operating transmittance is large and it is easy to leak, affecting the adsorption effect.

[0008] The present application can sequentially arrange a HEPA filter screen and a polymer adsorption filter screen according to the direction of the air to be treated. The VOCs-containing gas inhaled by the air purification filter screen passes through the HEPA filter screen and the molecular adsorption filter screen in sequence under the push of the air, and after composite purification, clean air is finally discharged.

[0009] Each layer of the grille of the present application includes a first grid and a second grid, and the first grid and the second grid are adjacent. The adjacency of the first grid and the second grid enables the adsorbent material to be staggeredly distributed in the space of the polymer adsorption filter screen, ensuring that there are almost no blank areas in the space of the polymer adsorption filter screen. Compared with filling each layer solidly, such filling reduces the air resistance by at least 50% (specifically, see the test results of Table 1 of this application at different air velocities), increases the air purification rate, does not require increasing the fan power, achieves a silent effect while ensuring the purification effect, and reduces energy consumption.

[0010] As an implementation manner, the mesh number of the mesh cloth of the air purification filter screen ≤ 48 meshes. The mesh number of the mesh cloth of the air purification filter screen mainly refers to the mesh number of the HEPA filter screen and / or the fixed filter screen.

[0011] As an implementation manner, the heat resistance temperature of the air purification filter screen ≤ 150 °C. At this temperature, regeneration of the air purification filter screen can be implemented. The air purification filter screen can be regenerated and reused by hot air, hot steam or alkaline solution (such as the hot air desorption and hot nitrogen desorption in the appendix of this application). Its regeneration conditions include but are not limited to: (1) Off-line regeneration method, place the saturated adsorption filter screen in a sodium hydroxide solution with a mass fraction of 0.25% - 5.00% and boil for 1 hour. After cooling, rinse with clean water, dry below 100 °C and then cool, and it can be reused. (2) On-line regeneration method, use an appropriate amount of hot steam to pass through the adsorption filter screen in the direction opposite to the air inlet, and the desorbed gas is discharged outdoors. After complete desorption, use hot air to blow the adsorption filter screen in the direction opposite to the air inlet until it is dry. After the desorption is completed, it can be restored for use. (3) On-line regeneration method, when a vacuum pump is equipped, place the adsorption filter screen in a negative pressure state. Pass hot air above 70 °C to quickly regenerate the saturated adsorption filter screen. Figure 1

[0012] The present application places no restrictions on the shapes of the first grid and the second grid, which can be regular polygons. As an implementation manner, the shapes of both the first grid and the second grid are regular hexagons and / or regular quadrilaterals.

[0013] The present application places no restrictions on the number of layers of the grid plates constituting the polymer adsorption filter screen, which can be 2 - 8 layers, that is, the polymer adsorption filter screen includes 2 - 8 layers of grilles stacked in the thickness direction.

[0014] As an implementation manner, all the grilles constituting the polymer adsorption filter screen are the same. After stacking, the grilles of adjacent two layers are aligned in the thickness direction. All the grilles constituting the polymer adsorption filter screen being the same not only includes the same grille structure, but also includes the same number of grids and the same grid structure on the grilles.

[0015] ​As an implementation manner, all the grids forming the polymer adsorption filter screen are the same. After stacking, all the grid cells of any one grid in two adjacent layers of grids are aligned with all the grid cells of the other grid in the thickness direction of the grid.

[0016] As another implementation manner, the total number of the first grid cells in each layer of grids is the same as the total number of the second grid cells. After stacking, all the first grid cells of any one grid in two adjacent layers of grids are aligned with all the second grid cells of the other grid in the thickness direction of the grid. Since all the grids forming the polymer adsorption filter screen are the same, the grid cells of each layer are aligned with each other in the thickness direction of the grid after stacking. For example, if six identical grids are stacked to form a polymer adsorption filter screen, and each layer has N grid cells, after stacking, N columns of channels are formed in the thickness direction of the grid. Each channel is formed by stacking six grid cells of the same size in the thickness direction of the grid. The cross-sectional area of each column of channels is the cross-sectional area of each grid cell, and in the thickness direction of the grid, the two adjacent grid cells in each column of channels are the first grid cell and the second grid cell respectively, that is, the adsorption material is stagger-filled along the thickness direction of the grid in each column of channels. This ensures the gas distribution area, so that when the VOC S gas enters the air purification filter screen, when passing through each column of channels under the push of air, it can first be purified by passing through the first grid filled with the adsorption material, then be redistributed evenly by passing through the second grid without the adsorption material, and then be purified again by passing through the first grid filled with the adsorption material. After multiple composite purifications and multi-layer treatments, adsorption and then redistribution and re-adsorption are carried out to ensure no bypass flow; in addition, the modular and uniform adsorption and redistribution adsorption method eliminates the risk brought by local leakage.

[0017] As an implementation manner, the cross-sectional area of the grid cell is 49 - 81 cm 2 . As another implementation manner, the cross-sectional area of the grid cell is 60 - 70 cm 2 . If the cross-sectional area of the grid cell is too small, it will increase the cost of the grid and reduce the air volume to be processed; if the cross-sectional area of the grid cell is too large, it will be difficult to ensure the air filtration effect and the firmness of the polymer adsorption filter screen.

[0018] As an implementation manner, the side length of the regular polygon is 7 - 9 cm; as another implementation manner, the regular polygon is a regular hexagon, and the side length of the grid of the regular hexagon is 7.5 - 8.5 cm. As an implementation manner, the thickness of the grid of the regular hexagon is 2 - 6 cm; as another implementation manner, the thickness of the grid of the regular hexagon is 3 - 5 cm.

[0019] As an implementation manner, the volume of the adsorption material filled in each first grid is 98 to 486 mL. As an implementation manner, the volume of the adsorption material filled in each first grid is 200 to 350 mL.

[0020] As an implementation manner, the shape of the adsorption material is spherical, and the specific surface area of the adsorption material is 1000 m 2 / g to 2000 m 2 / g; the pore volume of the adsorption material is 1.0 CC / g to 2.0 CC / g. The size of the specific surface area of the adsorption material is proportional to the ability of the material to adsorb VOC S gas, and the pore volume is related to the diffusion and adsorption volume of the VOCs gas. The larger the pore volume, the faster the gas diffusion. Ensuring a certain balance between the pore volume and specific surface area parameters can further ensure excellent adsorption effect.

[0021] The spherical adsorption material is selected in this application because the spherical shape has the least resistance to air flow.

[0022] As an implementation manner, the adsorption material is a polymer material.

[0023] As an implementation manner, the polymer material is selected from at least one of styrene, methyl styrene, divinylbenzene, methacrylic acid, methyl methacrylate, chlorostyrene, and methyl chlorostyrene. The air purification filter provided in this application uses a polymer material with extremely high strength, water repellency, and chemical stability, has high selectivity for VOC S under high humidity conditions, has no dust during use, does not produce by-products, has a stable and reliable long-term use effect, and can effectively remove VOCs gas. In addition, the air purification filter can be regenerated and reused by hot air, hot steam, or alkali solution. The air purification filter provided in this application can not only be used for civilian purposes, but also has great application space in industries such as industry, medicine, and transportation.

[0024] The preparation method of the high molecular polymer described in this application includes but is not limited to: preparing primary pore polymers by suspension agent method, formulating the composition of polymerization monomers, pore-forming agents, types of pore-forming agents, optimizing the degree of polymerization to obtain basic polymer white balls, and realizing different functionalizations by functionalizing different functional groups of the basic polymer white balls (for example, if the basic polymer white balls contain benzene rings, introducing functional groups such as chloromethyl, chloroethyl, bromomethyl, and bromoethyl onto the benzene rings of the polymer white balls); then adopting a post-crosslinking technology (a type of friedel-craft reaction) to further crosslink the functional group groups and the white ball skeleton into pores (for example, after the haloalkane on the benzene ring reacts with the active hydrogen on another benzene ring, the two benzene rings are connected by alkylation), forming rich micropores, and finally obtaining a high molecular polymer with certain mesopores and rich micropores. The high molecular polymer described in this application can also be prepared by other existing technologies such as the preparation process similar to that of the patent with the publication number CN102229710A.

[0025] This application can also centrally process the desorbed concentrated VOCs, that is, further perform harmless treatment by using technologies such as combustion (as shown in the appendix of this application Figure 1 . BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the operation of the air purification filter of this application;

[0027] Figure 2 Schematic diagram of the structures of the HEPA filter and the high molecular adsorption filter in the air purification filter of Example 7 of this application;

[0028] Figure 3 Schematic diagram of the structures of the HEPA filter and the high molecular adsorption filter in the air purification filter of Example 10 of this application;

[0029] Figure 4 Schematic diagram of the structures of the grid and the fixed filter in the air purification filter of this application;

[0030] Figure 5 Concentration curve graph of TVOC after the air purification filter of Example 2 of this application is regenerated three times.

[0031] In the figure, 1 - grille, 2 - first grid, 3 - second grid, 4 - HEPA filter, 5 - grid, 6 - fixed filter. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The following specific embodiments have described this application in detail. However, this application is not limited to the following embodiments.

[0033] Air resistance test: The test uses an adsorption and desorption dynamic experimental device equipped with piezoresistive display. The grille is filled in the adsorption column with a filling height of 10 cm. The air resistance of the grille filling method with the first grille and the second grille of the present application arranged adjacent to each other and the air resistance of the filling method with each layer filled solidly (each grille of each layer is filled with adsorption material) are respectively tested. The filling thickness of the adsorption material in the above two methods is 2 cm, and there are a total of 5 layers of grilles. The specific test data are shown in Table 1.

[0034] TVOC concentration test in air at different purification times: The air purification filter is regenerated off-line, that is, the saturated adsorption filter is boiled in a sodium hydroxide solution with a mass fraction of 0.25% - 5.00% for 1 hour, cooled, rinsed with clean water, dried below 100 °C and then cooled, and then can be reused. The experiment refers to the clean air volume test method for gaseous pollutants specified in the method of GB / T 18801-2015. Using a dynamic adsorption and desorption experimental device, by configuring a certain amount of polluted air and then passing it through the air filter, the concentration of air pollutants after treatment is regularly tested to obtain the concentration curve of TVOC in the air after different purification times. Figure 5 After three regenerations, the concentration curve graph of TVOC during the operation of the filter shows that the purification effect on TVOC in the air is repeatable and consistent.

[0035] Example 1:

[0036] An air purification filter, including a HEPA filter 4 and a polymer adsorption filter. The polymer adsorption filter is stacked by two layers of grilles 1 along its thickness direction. The grille 5 of the grille is a regular hexagon; the upper and lower surfaces of each layer of grille along the thickness direction are respectively connected to a first fixed filter and a second fixed filter. The first fixed filter is connected to the upper surface of the grille, and the second fixed filter is connected to the lower surface of the grille; wherein, the grille of each layer includes a first grille 2 filled with adsorption material and a second grille 3 not filled with adsorption material. Among them, the pore diameters of the first fixed filter and the second fixed filter are both smaller than the particle diameter of the adsorption material, further ensuring the fixing effect on the adsorption material.

[0037] When the air purification filter is in operation, it can refer to the attachment Figure 1As shown in the figure, first, the air containing VOCs enters the air purification filter screen; then, the VOCs gas is pushed by the air and sequentially passes through the HEPA filter screen and the polymer adsorption filter screen. After multiple composite purifications and desorption, clean air is finally discharged. The polymer adsorption filter screen of the present application is filled in a grid manner, which can ensure the uniformity of filling, that is, ensure that the VOCs gas can be evenly and effectively adsorbed (removed) in the treatment space of the entire polymer adsorption filter screen; in addition, this filling method can realize the individual setting of each grid to ensure the porosity of each grid, thereby playing a role in reducing the pressure drop and further ensuring the adsorption effect. Among them, the porosity of the first grid filled with the adsorption material is 58-60%, and this porosity range can not only play a role in further reducing the pressure drop, but also further achieve the technical effect of preventing the adsorption material from leaking.

[0038] Example 2:

[0039] Same as Example 1, except that the mesh number of the mesh cloth of the air purification filter screen is 10-20 meshes; the heat-resistant temperature of the air purification filter screen is 80-100 °C. At this heat-resistant temperature, the regeneration of the air filter screen can be implemented. The air purification filter screen adopts an off-machine regeneration method. The saturated adsorption filter screen is placed in a sodium hydroxide solution with a mass fraction of 0.25%-5.00% and boiled for 1 hour, cooled, rinsed with clean water, dried below 100 °C and then cooled, and then it can be reused.

[0040] Example 3:

[0041] Same as Example 1, except that the mesh number of the mesh cloth of the air purification filter screen is 20-30 meshes; the heat-resistant temperature of the air purification filter screen is 80-100 °C. At this heat-resistant temperature, the regeneration of the air filter screen can be implemented. The air purification filter screen adopts an appropriate amount of hot steam to pass through the adsorption filter screen in the opposite direction to the air inlet, and the desorbed gas is discharged outdoors. After complete desorption, hot air is used to blow the adsorption filter screen from bottom to top until it is dry. After the desorption is completed, it can be restored for use.

[0042] Example 4:

[0043] Same as Example 1, except that the mesh number of the mesh cloth of the air purification filter screen is 60-80 meshes; the heat-resistant temperature of the air purification filter screen is 80-150 °C. At this heat-resistant temperature, the regeneration of the air filter screen can be implemented. The air purification filter screen adopts an on-line regeneration method. When a vacuum pump is equipped, the adsorption filter screen is in a negative pressure state. By introducing hot air above 70 °C, the saturated adsorption filter screen can be quickly regenerated.

[0044] Example 5:

[0045] An air purification filter screen, comprising a HEPA filter screen 4 and a polymer adsorption filter screen, wherein the polymer adsorption filter screen is formed by stacking six layers of grids 1 in the thickness direction thereof; wherein, the upper surface of each layer of grid in the thickness direction is fixedly connected to a first fixed filter screen, and the lower surface of each layer of grid in the thickness direction is fixedly connected to a second fixed filter screen.

[0046] The grids 5 of each layer of grid include a first grid 1 filled with an adsorption material and a second grid 3 not filled with an adsorption material, and the first grid and the second grid of each layer of grid are adjacent; the adjacent first grid and second grid enable the adsorption material to be staggered in the space of the polymer adsorption filter screen, ensuring that there are almost no large blank areas without filled adsorption material in the space of the polymer adsorption filter screen. In addition, after such filling, the air resistance is reduced by at least 50% compared with filling each layer solid, the air purification rate is increased, and the purification effect is ensured without increasing the fan power, and the technical effects of noise reduction and energy consumption reduction are also achieved.

[0047] When the air purification filter screen operates, the air containing VOCs gas first enters the air purification filter screen, and sequentially passes through the HEPA filter screen and the polymer adsorption filter screen under the push of the air, and after composite purification, clean air is finally discharged. The polymer adsorption filter screen of the present application is filled in a grid manner, which can ensure the filling uniformity; in addition, this filling method can separately set each grid to ensure the porosity of each grid, thereby playing a role in reducing the pressure drop. Among them, the porosity of the first grid is 64-66%, and this porosity range can not only play a role in reducing the pressure drop, but also further play a technical effect of preventing the adsorption material from leaking.

[0048] Example 6:

[0049] An air purification filter screen, comprising a HEPA filter screen 4 and a polymer adsorption filter screen, wherein the polymer adsorption filter screen is formed by stacking eight layers of grids 1 in the thickness direction thereof. The grids 5 of each layer of grid include a first grid 2 filled with an adsorption material and a second grid 3 not filled with an adsorption material. All the grids constituting the polymer adsorption filter screen are the same, and the cross-sectional area of the grids of each grid is about 49 cm 2 , and the volume of the adsorption material filled in the first grid is 200 mL; after stacking, all the grids of any one grid in two adjacent layers of grids are aligned with all the grids of the other grid in the thickness direction of the grid. If six identical grids are stacked to form a polymer adsorption filter screen, each layer has N grids, and after stacking, N columns of channels are formed in the thickness direction of the grid, and each channel is formed by stacking eight grids of the same size in the thickness direction of the grid, and the cross-sectional area of each column of channels is the cross-sectional area of each grid.

[0050] When the air purification filter operates, the air containing VOCs first enters the air purification filter, and successively passes through the HEPA filter and the polymer adsorption filter under the push of the air. After composite purification, clean air is finally discharged. The polymer adsorption filter of the present application is filled in a grid manner, which can ensure the filling uniformity; in addition, this filling method can realize the individual setting of each grid to ensure the porosity of each grid, thereby playing a role in reducing the pressure drop. Among them, the porosity of the first grid filled with the adsorption material is 68-70%, and this porosity range can not only play a role in reducing the pressure drop, but also further achieve the technical effect that the adsorption material does not leak out.

[0051] Example 7:

[0052] An air purification filter, including a HEPA filter 4 and a polymer adsorption filter. The polymer adsorption filter is stacked by four layers of grids 1 along its thickness direction. The grid 5 of the grid is a regular quadrilateral; among them, the upper surface of each layer of grid along its thickness direction is fixedly connected to the first fixed filter, and its lower surface along its thickness direction is fixedly connected to the second fixed filter. The grid of each layer of grid includes a first grid 2 filled with spherical adsorption material and a second grid 3 not filled with adsorption material; the first grid and the second grid of each layer of grid are adjacent; the specific surface area of the spherical adsorption material is 1000m 2 / g, and the pore volume is 1.0 CC / g. All the grids constituting the polymer adsorption filter are the same, and the cross-sectional area of the grid of each grid is about 81 cm 2 , the volume of the adsorption material filled in the first grid is 350 mL; the total number of the first grids and the total number of the second grids of each layer of grid are the same. After stacking, all the first grids of any one grid in the adjacent two layers of grids are aligned with all the second grids of the other grid in the thickness direction of the grid. As shown in the appendix Figure 2 , if four identical grids are stacked to form a polymer adsorption filter, each layer has N grids. After stacking, N columns of channels are formed in the thickness direction of the grid. The cross-sectional area of each column of channels is the cross-sectional area of each grid, and in the thickness direction, the adjacent two grids in each column of channels are the first grid and the second grid respectively, that is, the adsorption material is filled staggeredly in each column of channels. This ensures the gas distribution area, so that after the VOC S gas enters the air purification filter, under the push of the air, after being purified by the first grid filled with the adsorption material, it is redistributed evenly in the second grid not filled with the adsorption material, and then purified by the first grid, thereby ensuring that the gas passes through without deviation and avoiding local leakage.

[0053] When the air purification filter operates, the air containing VOCs first enters the air purification filter, and successively passes through the HEPA filter and the polymer adsorption filter under the push of the air. After compound purification, clean air is finally discharged. The polymer adsorption filter of the present application is filled in a grid manner, which can ensure the filling uniformity; in addition, this filling method can separately set each grid to ensure the porosity of each grid, thereby playing a role in reducing the pressure drop. Among them, the porosity of the first grid filled with the adsorption material is 68-70%, and this porosity range can not only play a role in reducing the pressure drop, but also achieve the technical effect that the adsorption material does not leak.

[0054] Example 8:

[0055] Same as Example 7, except that the specific surface area of the spherical adsorption material is 2000m 2 / g, and the pore volume is 2.0 CC / g.

[0056] Example 9:

[0057] Same as Example 7, except that the specific surface area of the spherical adsorption material is 1500m 2 / g, and the pore volume is 1.5 CC / g.

[0058] Example 10:

[0059] An air purification filter includes a HEPA filter 4 and a polymer adsorption filter. The polymer adsorption filter is stacked by four layers of grids 1 along its thickness direction; the grids 5 of each layer of grid include the first grid 2 filled with the adsorption material and the second grid 3 not filled with the adsorption material. All the grids constituting the polymer adsorption filter are the same. After stacking, all the grids of any one grid in the adjacent two layers of grids are aligned with all the grids of another grid in the thickness direction of the grid. As shown in the attached drawing of the present application Figure 3 As shown, four identical grids are stacked to form a polymer adsorption filter. Each layer has N grids. After stacking, N columns of channels are formed in the thickness direction of the grid. Each channel is stacked by four grids of the same size in the thickness direction of the grid, and the cross-sectional area of each column of channels is the cross-sectional area of each grid. When the air purification filter operates, the air containing VOCs first enters the air purification filter, and successively passes through the HEPA filter and the polymer adsorption filter under the push of the air. After compound purification, clean air is finally discharged. The polymer adsorption filter of the present application is filled in a grid manner, which can ensure the filling uniformity; in addition, this filling method can separately set each grid to ensure the porosity of each grid, thereby playing a role in reducing the pressure drop. Among them, the porosity of the first grid filled with the adsorption material is 68-70%, and this porosity range can not only play a role in reducing the pressure drop, but also further achieve the technical effect that the adsorption material does not leak.

[0060] Table 1

[0061] Loading height cm 10 (grating loading) 10 (grating loading) 10 (compacted) 10 (compacted) Air velocity m / s 0.2 0.3 0.2 0.3 Air resistance Kpa 0.1 0.3 0.3 0.8

Claims

1. An air purification filter screen, comprising a HEPA filter screen and a polymer adsorption filter screen, characterized in that, The polymer adsorption filter screen is formed by stacking multiple layers of grids along its thickness direction; each layer of grid includes a first grid filled with adsorption material and a second grid not filled with adsorption material. The first grid and the second grid of each layer of grid are adjacent. After stacking, all the first grids of any one grid in two adjacent layers of grids are aligned with all the second grids of the other grid in the thickness direction of the grid. After stacking, multiple columns of channels are formed in the thickness direction of the grid. The cross-sectional area of each column of channels is the cross-sectional area of each grid, and in the thickness direction of the grid, the two adjacent grids in each column of channels are respectively a first grid and a second grid. In each column of channels, the adsorption material is stagger-loaded along the thickness direction of the grid, so that after the gas enters the air purification filter screen and passes through each column of channels under the push of the air, it is first purified by the first grid filled with adsorption material, then redistributed evenly through the second grid not filled with adsorption material, and then purified by the first grid filled with adsorption material again.

2. The air purification filter screen according to claim 1, characterized in that, The mesh number of the mesh cloth of the HEPA filter screen ≤ 48 meshes.

3. The air purification filter screen according to claim 1, characterized in that, The heat-resistant temperature of the air purification filter screen ≤ 150 °C.

4. The air purification filter according to claim 1, wherein The upper and lower surfaces of each layer of grid along the thickness direction are respectively connected to a first fixed filter screen and a second fixed filter screen. The first fixed filter screen is connected to the upper surface of the grid, and the second fixed filter screen is connected to the lower surface of the grid.

5. The air purification filter according to claim 1, wherein The shapes of the first grid and the second grid are both regular polygons.

6. The air purification filter according to claim 5, wherein The side length of the regular polygon is 7 - 9 cm.

7. The air purification filter according to claim 5, characterized in that, The shapes of the first grid and the second grid are regular hexagons or regular quadrilaterals.

8. The air purification filter according to claim 1, wherein The polymer adsorption filter screen includes 2 - 8 layers of grids stacked along the thickness direction.

9. The air purification filter according to claim 1, characterized in that, The total number of the first grids and the total number of the second grids of each layer of grid are the same.

10. The air purification filter screen according to claim 1, characterized in that, The cross-sectional areas of the first grid and the second grid are 49 to 81 cm 2 .

11. The air purification filter according to claim 1, wherein, The thickness of the first grid and the second grid is 2 - 6 cm.

12. The air purification filter according to claim 1, wherein The volume of the adsorption material filled in the first grid is 98 - 486 mL.

13. The air purification filter screen according to claim 1, characterized in that, The shape of the adsorbent material is spherical; the specific surface area of the adsorbent material is 1000 m 2 / g to 2000 m 2 / g; the pore volume of the adsorbent material is 1.0 CC / g to 2.0 CC / g.

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