Multi-stage filter screen and medium-efficiency air filter

Abstract

The invention discloses a multi-stage filter screen and a medium-efficiency air filter, and relates to the technical field of filters, the multi-stage filter screen comprises a filter screen and an adsorption screen; the filter screen comprises a first filter screen plate and a second filter screen plate, and the adsorption screen is arranged between the first filter screen plate and the second filter screen plate; the adsorption net comprises a first adsorption net plate, a second adsorption net plate and a third adsorption net plate, and the first adsorption net plate, the first adsorption net plate, the second adsorption net plate, the third adsorption net plate and the second adsorption net plate are sequentially arranged from top to bottom. Through the multi-stage filter screen composed of the filter screen and the adsorption screen, dust in air can be conveniently filtered by the filter screen, and the adsorption screen is used for adsorbing peculiar smell and methylbenzene in the air, so that the air can be better filtered through the multi-stage filter screen, and the air filtered by the multi-stage filter screen can be conveniently kept clean; the primarily filtered air can be sequentially adsorbed by the first adsorption net plate, the second adsorption net plate and the third adsorption net plate.

Description

Technical Field

[0001] The present invention relates to the technical field of filters, and in particular to a multi-stage filter screen and a medium-efficiency air filter. Background Art

[0002] Air filter refers to air filtering device, which is generally used in clean workshops, clean factories, laboratories and clean rooms, or for dust prevention of electronic machinery and communication equipment. There are primary filter, medium filter, high efficiency filter and sub-high efficiency filter. When the air filter filters the air, the filter is an important part of the air filter.

[0003] When using traditional air filters, the dust in the environment is easily covered on the outside of the filter when it is filtered through a single filter, which reduces the filtering effect of the filter. The clogged filter cannot achieve the purpose of air filtering. At the same time, it is difficult to filter the dust in the air in stages, and it is not convenient to absorb odors and harmful substances in the air.

[0004] Based on this, a medium-efficiency air filter with multi-stage filter screen is designed. Summary of the invention

[0005] The present invention aims at the deficiencies of the prior art and provides the following technical solutions: a multi-stage filter screen, comprising a filter screen and an adsorption screen;

[0006] The filter screen comprises a first filter screen plate and a second filter screen plate, and the adsorption screen is arranged between the first filter screen plate and the second filter screen plate;

[0007] The adsorption net includes a first adsorption net plate, a second adsorption net plate and a third adsorption net plate, and the first filter net plate, the first adsorption net plate, the second adsorption net plate, the third adsorption net plate and the second filter net plate are arranged in sequence from top to bottom.

[0008] As an improvement of the above technical solution, the first filter screen plate includes electrostatic fiber cloth, carbon fiber electric heating net, copper ion fiber cloth, first filter cotton, and second filter cotton arranged in sequence from bottom to top, and the second filter screen plate includes silver ion fiber cloth, third filter cotton, and fourth filter cotton arranged in sequence from bottom to top, the electrostatic fiber cloth is used to electrostatically adsorb dust in the air, the carbon fiber electric heating net is used to heat the first filter screen plate, the copper ion fiber cloth is used to antibacterial the first filter screen plate, the first filter cotton, the second filter cotton, the third filter cotton, and the fourth filter cotton are used together to filter dust in the air, and the silver ion fiber cloth is used to antibacterial the second filter screen plate.

[0009] As an improvement of the above technical solution, the first adsorption mesh plate includes a first non-woven fabric, an activated carbon mesh plate and a second non-woven fabric arranged in sequence from bottom to top, the first non-woven fabric and the second non-woven fabric are used to protect the activated carbon mesh plate, and the activated carbon mesh plate is used to adsorb odors in the air, the second adsorption mesh plate includes a third non-woven fabric, an activated alumina mesh plate and a fourth non-woven fabric arranged in sequence from bottom to top, the third non-woven fabric and the fourth non-woven fabric are used to protect the activated alumina mesh plate, and the activated alumina mesh plate is used to absorb water vapor in the second adsorption mesh plate, the third adsorption mesh plate includes a fifth non-woven fabric, a nano-mineral crystal mesh plate and a sixth non-woven fabric arranged in sequence from bottom to top, the fifth non-woven fabric and the sixth non-woven fabric are used to protect the nano-mineral crystal mesh plate, and the nano-mineral crystal mesh plate is used to remove harmful substances in the air.

[0010] As an improvement of the above technical solution, the first filter mesh plate, the first adsorption mesh plate, the second adsorption mesh plate, the third adsorption mesh plate and the second filter mesh plate are all rectangular structures, and the first filter mesh plate, the first adsorption mesh plate, the second adsorption mesh plate, the third adsorption mesh plate and the second filter mesh plate are arranged in parallel.

[0011] A medium-efficiency air filter with a multi-stage filter screen comprises a shell, wherein the first filter screen plate, a first adsorption screen plate, a second adsorption screen plate, a third adsorption screen plate and a second filter screen plate are installed in a groove opened on the side of the shell, the sides of the first filter screen plate, the first adsorption screen plate, the second adsorption screen plate, the third adsorption screen plate and the second filter screen plate are fixed with filter screen side plates, and both ends of the filter screen side plates are provided with ear plates bent inwardly, and positioning pieces connected to the shell are installed on the ear plates at both ends of the filter screen side plates, and support rings are welded on the inner surface of the shell, the support rings are grouped into two, and there are five groups of support rings in total, and the five groups of support rings respectively support the first filter screen plate, the first adsorption screen plate, the second adsorption screen plate, the third adsorption screen plate and the second filter screen plate.

[0012] As an improvement of the above technical solution, the positioning member includes a sleeve and a threaded joint fixed at the end of the sleeve, and the threaded joint is screwed into the screw holes opened on the surfaces of the ear plates at both ends of the filter side plate. An elastic pull-out member is arranged in the sleeve, and the end of the elastic pull-out member is inserted into the positioning hole opened on the outer surface of the shell.

[0013] As an improvement of the above technical solution, the elastic pull-out part includes a spring and a limiting rod arranged in a sleeve, the spring is sleeved on the outside of the limiting rod, a limiting ring is welded on the surface of the limiting rod located inside the sleeve, one end of the spring is welded to the surface of the limiting ring, the other end of the spring is welded to the inner surface of the sleeve, and the end of the limiting rod is inserted into a positioning hole opened on the outer surface of the shell.

[0014] As an improvement of the above technical solution, fans for discharging air upwards are installed at both ends of the shell.

[0015] As an improvement of the above technical solution, protective nets for protecting the fan are fixed to both ends of the shell.

[0016] As an improvement of the above technical solution, a positioning ring with a rectangular ring structure is installed on the outer surface of the upper end of the shell, and bolt holes are opened on the surface of the positioning ring.

[0017] Beneficial effects of the present invention:

[0018] 1. Through the multi-stage filter composed of the filter and the adsorption net, it is convenient for the filter to filter the dust in the air, and the adsorption net is used to adsorb the odor and toluene in the air, so that the air can be better filtered through the multi-stage filter, and the air filtered by the multi-stage filter can be kept clean; the filter is composed of the first filter plate and the second filter plate, and the adsorption net is composed of the first adsorption plate, the second adsorption plate and the third adsorption plate, so that the air that has been initially filtered is then adsorbed in turn by the first adsorption plate, the second adsorption plate and the third adsorption plate, and the air after adsorption is then passed through the second filter The secondary filtration of the filter plate allows the large particles in the air, such as dust, pollen and hair, to be initially filtered out through the first filter plate, thereby achieving preliminary air cleaning and reducing the burden of subsequent processing. The air is adsorbed by the first adsorption plate, the second adsorption plate and the third adsorption plate to capture harmful substances and volatile organic compounds in the gas, effectively remove odors and harmful gases, and improve air quality. The second filter plate then re-filters and uses high-efficiency filter materials to remove the remaining fine particles and potential biological pollutants, ensuring that the final output air is cleaner and more hygienic.

[0019] 2. Through the first filter screen composed of electrostatic fiber cloth, carbon fiber electric heating net, copper ion fiber cloth, first filter cotton, and second filter cotton, and the second filter screen composed of silver ion fiber cloth, third filter cotton and fourth filter cotton, the first filter cotton, the second filter cotton, the third filter cotton and the fourth filter cotton are used to filter dust in the air, ensuring the filtering effect of the first filter screen and the second filter screen on the air. The electrostatic fiber cloth is used to electrostatically adsorb dust in the air, so that dust adheres to the surface of the electrostatic fiber cloth under the action of static electricity, thereby reducing the burden of subsequent dust filtration. The carbon fiber electric heating net is used to heat the first filter screen, so that water molecules in the air evaporate after heating in the first filter screen, thereby reducing the moisture content of the first filter screen, avoiding the problem of filtration failure caused by excessive water content in the first filter screen, and the copper ion fiber cloth is used to antibacterial the first filter screen, and the silver ion fiber cloth is used to antibacterial the second filter screen, thereby improving the antibacterial performance of the first filter screen and the second filter screen.

[0020] 3. Through the first adsorption mesh plate composed of the first non-woven fabric, the activated carbon mesh plate and the second non-woven fabric, the second adsorption mesh plate composed of the third non-woven fabric, the activated alumina mesh plate and the fourth non-woven fabric, and the third adsorption mesh plate composed of the fifth non-woven fabric, the nano-mineral crystal mesh plate and the sixth non-woven fabric, the activated carbon mesh plate can absorb odor in the air and reduce odor after air filtration, the activated alumina mesh plate absorbs water vapor in the second adsorption mesh plate to reduce the entry of moisture into the third adsorption mesh plate and the second filter mesh plate, and the nano-mineral crystal mesh plate removes harmful substances in the air to reduce toluene gas in the air.

[0021] 4. The filter side plate is fixed by the side of the first filter screen plate, the first adsorption screen plate, the second adsorption screen plate, the third adsorption screen plate and the second filter screen plate, and the filter side plate is fixedly connected to the shell through the positioning piece, so that the first filter screen plate, the first adsorption screen plate, the second adsorption screen plate, the third adsorption screen plate and the second filter screen plate are fixed in the groove opened on the side of the shell through the filter side plate and the positioning piece, which is convenient for the installation and positioning of the first filter screen plate, the first adsorption screen plate, the second adsorption screen plate, the third adsorption screen plate and the second filter screen plate, and the support ring welded on the inner surface of the shell, two support rings are a group, and five support rings are provided, so that the five groups of support rings respectively support the first filter screen plate, the first adsorption screen plate, the second adsorption screen plate, the third adsorption screen plate and the second filter screen plate, thereby increasing the stability of the installation of the first filter screen plate, the first adsorption screen plate, the second adsorption screen plate, the third adsorption screen plate and the second filter screen plate.

[0022] 5. Through the positioning piece composed of a sleeve, a threaded joint and an elastic pull-out piece, the threaded joint fixed at the end of the sleeve is screwed into the screw hole opened on the surface of the ear plate of the filter side plate, and the elastic pull-out piece is installed inside the sleeve, so that the end of the elastic pull-out piece is conveniently inserted into the positioning hole opened on the outer surface of the shell, thereby facilitating the positioning piece to fix the filter side plate to the shell.

[0023] 6. The elastic pull-out part includes a spring, a limit rod and a limit ring, and the spring and the limit rod are installed inside the sleeve. At the same time, the limit ring is welded on the surface of the limit rod inside the sleeve, so that the two ends of the spring are respectively welded and fixed on the surface of the sleeve and the limit ring, and the end of the limit rod is inserted into the positioning hole opened on the outer surface of the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional structural diagram of the present invention;

[0025] Figure 2 It is a split structure diagram of the present invention;

[0026] Figure 3 It is a cross-sectional structural diagram of the present invention;

[0027] Figure 4It is a structural diagram of the housing, filter side plate, positioning member and first filter plate in the present invention;

[0028] Figure 5 for Figure 2 The enlarged structure diagram at A in the middle;

[0029] Figure 6 It is a structural diagram of the multi-stage filter in the present invention.

[0030] 1. Shell; 2. Filter side plate; 3. Positioning piece; 31. Sleeve; 32. Threaded joint; 33. Spring; 34. Limiting rod; 35. Limiting ring; 4. First filter screen; 41. Electrostatic fiber cloth; 42. Carbon fiber electric heating net; 43. Copper ion fiber cloth; 44. First filter cotton; 45. Second filter cotton; 5. First adsorption screen; 51. First non-woven fabric; 52. Activated carbon mesh plate; 53. Second non-woven fabric; 6. Second adsorption screen; 61. Third non-woven fabric; 62. Activated alumina mesh plate; 63. Fourth non-woven fabric; 7. Third adsorption screen; 71. Fifth non-woven fabric; 72. Nano-mineral crystal mesh plate; 73. Sixth non-woven fabric; 8. Second filter screen; 81. Silver ion fiber cloth; 82. Third filter cotton; 83. Fourth filter cotton; 9. Support ring; 10. Fan; 11. Positioning ring; 12. Protective net. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] See also Figure 1-6 The present invention provides a technical solution: a multi-stage filter screen, comprising a filter screen and an adsorption screen; the multi-stage filter screen composed of the filter screen and the adsorption screen is used to filter dust in the air, and the adsorption screen is used to adsorb odor and toluene in the air, so that the air can be better filtered through the multi-stage filter screen, and the air filtered by the multi-stage filter screen is kept clean;

[0033] The filter screen includes a first filter screen plate 4 and a second filter screen plate 8, and the adsorption screen is arranged between the first filter screen plate 4 and the second filter screen plate 8; the filter screen is composed of the first filter screen plate 4 and the second filter screen plate 8, and the adsorption screen is composed of the first adsorption screen plate 5, the second adsorption screen plate 6 and the third adsorption screen plate 7, so that the air that has undergone preliminary filtration is then adsorbed in sequence by the first adsorption screen plate 5, the second adsorption screen plate 6 and the third adsorption screen plate 7, and the adsorbed air is then filtered for the second time by the second filter screen plate 8, so that the large particulate matter in the air, such as dust, pollen and hair, is removed after preliminary filtration by the first filter screen plate 4, thereby achieving preliminary air cleaning and reducing the burden of subsequent processing.

[0034] The adsorption net includes a first adsorption net plate 5, a second adsorption net plate 6 and a third adsorption net plate 7, and the first filter net plate 4, the first adsorption net plate 5, the second adsorption net plate 6, the third adsorption net plate 7 and the second filter net plate 8 are arranged in sequence from top to bottom; and the air is adsorbed by the first adsorption net plate 5, the second adsorption net plate 6 and the third adsorption net plate 7 to capture harmful substances and volatile organic compounds in the gas, effectively remove odor and harmful gases, and improve air quality, and through the re-filtration of the second filter net plate 8, the remaining fine particles and potential biological pollutants are removed again through the high-efficiency filter material, ensuring that the final output air is cleaner and more hygienic.

[0035] Specifically, the first filter plate 4 includes an electrostatic fiber cloth 41, a carbon fiber electric heating net 42, a copper ion fiber cloth 43, a first filter cotton 44, and a second filter cotton 45, which are arranged in sequence from bottom to top. The second filter plate 8 includes a silver ion fiber cloth 81, a third filter cotton 82, and a fourth filter cotton 83, which are arranged in sequence from bottom to top. The electrostatic fiber cloth 41 is used to electrostatically adsorb dust in the air, the carbon fiber electric heating net 42 is used to heat the first filter plate 4, the copper ion fiber cloth 43 is used to antibacterial the first filter plate 4, the first filter cotton 44, the second filter cotton 45, the third filter cotton 82, and the fourth filter cotton 83 are used together to filter dust in the air, and the silver ion fiber cloth 81 is used to antibacterial the second filter plate 8.

[0036] In this embodiment, by using the first filter screen plate 4 composed of the electrostatic fiber cloth 41, the carbon fiber electric heating net 42, the copper ion fiber cloth 43, the first filter cotton 44, and the second filter cotton 45, and the second filter screen plate 8 composed of the silver ion fiber cloth 81, the third filter cotton 82 and the fourth filter cotton 83, it is convenient for the first filter cotton 44, the second filter cotton 45, the third filter cotton 82 and the fourth filter cotton 83 to cooperate in filtering dust in the air, ensuring the filtering effect of the first filter screen plate 4 and the second filter screen plate 8 on the air, and the electrostatic fiber cloth 41 is used to electrostatically adsorb dust in the air, so that the dust can be removed in the static Under the action of electricity, it adheres to the surface of the electrostatic fiber cloth 41, thereby reducing the burden of subsequent dust filtration. The carbon fiber electric heating net 42 is used to heat the first filter plate 4, so that the water molecules in the air evaporate after heating in the first filter plate 4, thereby reducing the moisture content of the first filter plate 4, avoiding the problem of filtration failure caused by excessive water content in the first filter plate 4, and the copper ion fiber cloth 43 is used to antibacterial the first filter plate 4, and the silver ion fiber cloth 81 is used to antibacterial the second filter plate 8, thereby improving the antibacterial properties of the first filter plate 4 and the second filter plate 8.

[0037] Specifically, the first adsorption mesh plate 5 includes a first non-woven fabric 51, an activated carbon mesh plate 52 and a second non-woven fabric 53 arranged in sequence from bottom to top, the first non-woven fabric 51 and the second non-woven fabric 53 are used to protect the activated carbon mesh plate 52, and the activated carbon mesh plate 52 is used to absorb odor in the air. The second adsorption mesh plate 6 includes a third non-woven fabric 61, an activated alumina mesh plate 62 and a fourth non-woven fabric 63 arranged in sequence from bottom to top, the third non-woven fabric 61 and the fourth non-woven fabric 63 are used to protect the activated alumina mesh plate 62, and the activated alumina mesh plate 62 is used to absorb water vapor in the second adsorption mesh plate 6, and the third adsorption mesh plate 7 includes a fifth non-woven fabric 71, a nano-mineral crystal mesh plate 72 and a sixth non-woven fabric 73 arranged in sequence from bottom to top, the fifth non-woven fabric 71 and the sixth non-woven fabric 73 are used to protect the nano-mineral crystal mesh plate 72, and the nano-mineral crystal mesh plate 72 is used to remove harmful substances in the air.

[0038] In this embodiment, the first adsorption mesh plate 5 composed of the first non-woven fabric 51, the activated carbon mesh plate 52 and the second non-woven fabric 53, the second adsorption mesh plate 6 composed of the third non-woven fabric 61, the activated alumina mesh plate 62 and the fourth non-woven fabric 63, and the third adsorption mesh plate 7 composed of the fifth non-woven fabric 71, the nano-mineral crystal mesh plate 72 and the sixth non-woven fabric 73 are used to facilitate the activated carbon mesh plate 52 to adsorb odor in the air and reduce the odor after air filtration, the activated alumina mesh plate 62 absorbs water vapor in the second adsorption mesh plate 6, and facilitates reducing the entry of moisture into the third adsorption mesh plate 7 and the second filter mesh plate 8, and the nano-mineral crystal mesh plate 72 removes harmful substances in the air and facilitates reducing toluene gas in the air.

[0039] Specifically, the first filter mesh plate 4, the first adsorption mesh plate 5, the second adsorption mesh plate 6, the third adsorption mesh plate 7 and the second filter mesh plate 8 are all rectangular structures, and the first filter mesh plate 4, the first adsorption mesh plate 5, the second adsorption mesh plate 6, the third adsorption mesh plate 7 and the second filter mesh plate 8 are arranged in parallel.

[0040] A medium-efficiency air filter with a multi-stage filter screen comprises a shell 1, a first filter screen plate 4, a first adsorption screen plate 5, a second adsorption screen plate 6, a third adsorption screen plate 7 and a second filter screen plate 8 are installed in a groove opened on the side of the shell 1, the sides of the first filter screen plate 4, the first adsorption screen plate 5, the second adsorption screen plate 6, the third adsorption screen plate 7 and the second filter screen plate 8 are fixed with filter screen side plates 2, and both ends of the filter screen side plates 2 are provided with inwardly bent ear plates, and positioning members 3 connected to the shell 1 are installed on the ear plates at both ends of the filter screen side plates 2, and support rings 9 are welded on the inner surface of the shell 1, two support rings 9 are in a group, and there are five groups of support rings 9, and the five groups of support rings 9 respectively support the first filter screen plate 4, the first adsorption screen plate 5, the second adsorption screen plate 6, the third adsorption screen plate 7 and the second filter screen plate 8.

[0041] In this embodiment, the filter side plate 2 is fixed by the side of the first filter screen plate 4, the first adsorption screen plate 5, the second adsorption screen plate 6, the third adsorption screen plate 7 and the second filter screen plate 8, and the filter side plate 2 is fixedly connected to the shell body 1 through the positioning member 3, so that the first filter screen plate 4, the first adsorption screen plate 5, the second adsorption screen plate 6, the third adsorption screen plate 7 and the second filter screen plate 8 are fixed in the groove opened on the side of the shell body 1 through the filter side plate 2 and the positioning member 3, which is convenient for the installation and positioning of the first filter screen plate 4, the first adsorption screen plate 5, the second adsorption screen plate 6, the third adsorption screen plate 7 and the second filter screen plate 8, and the support ring 9 welded on the inner surface of the shell body 1, two support rings 9 are a group, and five support rings 9 are provided, so that the five groups of support rings 9 respectively support the first filter screen plate 4, the first adsorption screen plate 5, the second adsorption screen plate 6, the third adsorption screen plate 7 and the second filter screen plate 8, thereby increasing the installation stability of the first filter screen plate 4, the first adsorption screen plate 5, the second adsorption screen plate 6, the third adsorption screen plate 7 and the second filter screen plate 8.

[0042] Specifically, the positioning member 3 includes a sleeve 31 and a threaded joint 32 fixed at the end of the sleeve 31, and the threaded joint 32 is screwed into the screw holes opened on the surfaces of the ear plates at both ends of the filter side plate 2. An elastic pull-out member is arranged in the sleeve 31, and the end of the elastic pull-out member is inserted into the positioning hole opened on the outer surface of the shell 1.

[0043] In this embodiment, a positioning member 3 consisting of a sleeve 31, a threaded joint 32 and an elastic pull-out member is used, and the threaded joint 32 fixed at the end of the sleeve 31 is screwed into a screw hole opened on the surface of the ear plate of the filter side plate 2, and the elastic pull-out member is installed inside the sleeve 31, so that the end of the elastic pull-out member can be inserted into the positioning hole opened on the outer surface of the shell 1, thereby facilitating the positioning member 3 to fix the filter side plate 2 to the shell 1.

[0044] Specifically, the elastic pull-out part includes a spring 33 and a limiting rod 34 arranged in the sleeve 31. The spring 33 is sleeved on the outside of the limiting rod 34. The limiting rod 34 is located inside the sleeve 31 and has a limiting ring 35 welded on its surface. One end of the spring 33 is welded to the surface of the limiting ring 35, and the other end of the spring 33 is welded to the inner surface of the sleeve 31, and the end of the limiting rod 34 is inserted into the positioning hole opened on the outer surface of the shell 1.

[0045] In this embodiment, the elastic pull-out member includes a spring 33, a limiting rod 34 and a limiting ring 35, and the spring 33 and the limiting rod 34 are installed inside the sleeve 31. At the same time, the limiting rod 34 is located on the surface of the sleeve 31 and the limiting ring 35 is welded, so that the two ends of the spring 33 are respectively welded and fixed on the surfaces of the sleeve 31 and the limiting ring 35, and the end of the limiting rod 34 is inserted into the positioning hole opened on the outer surface of the shell 1.

[0046] Specifically, fans 10 for discharging air upward are installed at both ends of the housing 1 .

[0047] Specifically, protective nets 12 for protecting the fan 10 are fixed to both ends of the housing 1 .

[0048] Specifically, a positioning ring 11 having a rectangular ring structure is installed on the outer surface of the upper end of the housing 1 , and bolt holes are provided on the surface of the positioning ring 11 .

[0049] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. A multi-stage filter, characterized in that: Including filter screen and adsorption screen; The filter screen comprises a first filter screen plate (4) and a second filter screen plate (8), and the adsorption screen is arranged between the first filter screen plate (4) and the second filter screen plate (8); The adsorption net comprises a first adsorption net plate (5), a second adsorption net plate (6) and a third adsorption net plate (7), and the first filter net plate (4), the first adsorption net plate (5), the second adsorption net plate (6), the third adsorption net plate (7) and the second filter net plate (8) are arranged in sequence from top to bottom.

2. A multi-stage filter screen according to claim 1, characterized in that: The first filter screen plate (4) comprises an electrostatic fiber cloth (41), a carbon fiber electric heating net (42), a copper ion fiber cloth (43), a first filter cotton (44), and a second filter cotton (45) which are arranged in sequence from bottom to top; the second filter screen plate (8) comprises a silver ion fiber cloth (81), a third filter cotton (82), and a fourth filter cotton (83) which are arranged in sequence from bottom to top; the electrostatic fiber cloth (41) is used for electrostatically adsorbing dust in the air; the carbon fiber electric heating net (42) is used for heating the first filter screen plate (4); the copper ion fiber cloth (43) is used for antibacterial effect on the first filter screen plate (4); the first filter cotton (44), the second filter cotton (45), the third filter cotton (82), and the fourth filter cotton (83) are used in combination for filtering dust in the air; and the silver ion fiber cloth (81) is used for antibacterial effect on the second filter screen plate (8).

3. A multi-stage filter and medium efficiency air filter according to claim 1, characterized in that: The first adsorption mesh plate (5) comprises a first non-woven fabric (51), an activated carbon mesh plate (52) and a second non-woven fabric (53) which are arranged in sequence from bottom to top, the first non-woven fabric (51) and the second non-woven fabric (53) are used to protect the activated carbon mesh plate (52), the activated carbon mesh plate (52) is used to adsorb odor in the air, and the second adsorption mesh plate (6) comprises a third non-woven fabric (61), an activated alumina mesh plate (62) and a fourth non-woven fabric (63) which are arranged in sequence from bottom to top, the third non-woven fabric (61) The fourth non-woven fabric (63) is used to protect the activated alumina mesh plate (62), the activated alumina mesh plate (62) is used to absorb water vapor in the second adsorption mesh plate (6), the third adsorption mesh plate (7) includes a fifth non-woven fabric (71), a nano-mineral crystal mesh plate (72) and a sixth non-woven fabric (73) arranged in sequence from bottom to top, the fifth non-woven fabric (71) and the sixth non-woven fabric (73) are used to protect the nano-mineral crystal mesh plate (72), and the nano-mineral crystal mesh plate (72) is used to remove harmful substances in the air.

4. A multi-stage filter and medium efficiency air filter according to claim 1, characterized in that: The first filter mesh plate (4), the first adsorption mesh plate (5), the second adsorption mesh plate (6), the third adsorption mesh plate (7) and the second filter mesh plate (8) are all rectangular structures, and the first filter mesh plate (4), the first adsorption mesh plate (5), the second adsorption mesh plate (6), the third adsorption mesh plate (7) and the second filter mesh plate (8) are arranged in parallel.

5. A medium efficiency air filter with a multi-stage filter screen according to any one of claims 1 to 4, characterized in that: The invention comprises a shell (1), wherein the first filter screen plate (4), the first adsorption screen plate (5), the second adsorption screen plate (6), the third adsorption screen plate (7) and the second filter screen plate (8) are installed in a groove provided on the side of the shell (1); the sides of the first filter screen plate (4), the first adsorption screen plate (5), the second adsorption screen plate (6), the third adsorption screen plate (7) and the second filter screen plate (8) are all fixed with filter screen side plates (2), and both ends of the filter screen side plates (2) are provided with inwardly bent ear plates, and the ear plates at both ends of the filter screen side plates (2) are both provided with positioning members (3) connected to the shell (1); and the inner surface of the shell (1) is welded with support rings (9), and the support rings (9) are grouped in two, and there are five groups of support rings (9) in total, and the five groups of support rings (9) respectively support the first filter screen plate (4), the first adsorption screen plate (5), the second adsorption screen plate (6), the third adsorption screen plate (7) and the second filter screen plate (8).

6. A multi-stage filter screen and medium efficiency air filter according to claim 5, characterized in that: The positioning member (3) comprises a sleeve (31) and a threaded joint (32) fixed at the end of the sleeve (31), and the threaded joint (32) is screwed into screw holes provided on the surfaces of the ear plates at both ends of the filter side plate (2). An elastic drawer is provided in the sleeve (31), and the end of the elastic drawer is inserted into a positioning hole provided on the outer surface of the shell (1).

7. A multi-stage filter screen and medium efficiency air filter according to claim 6, characterized in that: The elastic pull-out member comprises a spring (33) and a limiting rod (34) arranged in a sleeve (31); the spring (33) is sleeved outside the limiting rod (34); a limiting ring (35) is welded on the surface of the limiting rod (34) located inside the sleeve (31); one end of the spring (33) is welded to the surface of the limiting ring (35); the other end of the spring (33) is welded to the inner surface of the sleeve (31); and the end of the limiting rod (34) is inserted into a positioning hole opened on the outer surface of the shell (1).

8. The multi-stage filter and medium efficiency air filter according to claim 5, characterized in that: Fans (10) for discharging air upwards are installed at both ends of the housing (1).

9. A multi-stage filter screen and medium efficiency air filter according to claim 8, characterized in that: Protection nets (12) for protecting the fan (10) are fixed at both ends of the housing (1).

10. A multi-stage filter screen and medium efficiency air filter according to claim 5, characterized in that: A positioning ring (11) having a rectangular ring structure is installed on the outer surface of the upper end of the shell (1), and bolt holes are provided on the surface of the positioning ring (11).

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