A multi-layer filtering air purification dust removal device

Abstract

The application discloses a kind of multi-layer filtering air purification dust removal equipment, it is related to air purification dust removal equipment technical field;Including installation base frame, the installation base frame is equipped with integrated valve body assembly, the integrated valve body assembly includes three-stage filtration unit, the three-stage filtration unit is sequentially primary dust removal component, middle-grade oil mist component, senior filter component, and primary dust removal component, middle-grade oil mist component, senior filter component sequentially communicate between, the three-stage filtration unit all includes sedimentation and collects dirty filter cup, composite filter core structure is installed in the sedimentation and collects dirty filter cup, drain is installed in the bottom of the sedimentation and collects dirty filter cup.It is characterized in that: different particle size, different types of pollutants are processed specifically, the problem that single filtering of traditional single-stage filter is completely solved, purification is not thorough, multiple filtering layers of scrutiny, effectively improve impurity interception rate, avoid tiny particle penetration filtering layer, significantly improve air dust removal oil purification precision.

Description

Technical Field

[0001] This invention relates to the field of air purification and dust removal equipment technology, and in particular to a multi-layer filtration air purification and dust removal equipment. Background Technology

[0002] In the field of industrial compressed air purification, dust removal, and oil removal technology, air purification and dust removal equipment is widely used in various pneumatic equipment, precision machining, and automated production environments. It is primarily used to remove solid dust, water mist, oil mist, and trace amounts of oil vapor from compressed air to ensure the normal and stable operation of downstream air-consuming equipment. Currently, most traditional air purification and dust removal equipment on the market adopts a single-stage, single-layer filtration structure with a limited filtration mode, exhibiting significant technical defects and limitations in application, making it difficult to meet the high-precision and high-stability requirements of industrial air use.

[0003] Firstly, traditional filtration equipment mostly uses a single-element filter structure, which cannot achieve graded filtration. The single filtration level only intercepts large particles of dust in the air, making it difficult to specifically differentiate and treat pollutants of different particle sizes and types. In actual operating conditions, compressed air is mixed with various impurities such as large solid particles, fine water mist, suspended oil mist, and ultrafine oil vapor. Traditional single-stage filtration structures cannot adapt to the purification needs of multiple types of impurities, easily leading to large particles clogging the filter element and fine oil mist and ultrafine dust penetrating the filter layer. This results in incomplete purification and low filtration accuracy, leading to insufficient cleanliness of the output compressed air. Long-term use can cause wear, blockage, and malfunction of downstream precision equipment, affecting the stability of production operations.

[0004] Secondly, existing traditional filters generally adopt a single-layer filtration structure, relying solely on a single filter media to complete the filtration operation. The filtration process is simple, with weak interception layers and a lack of multi-stage progressive filtration mechanisms. Conventional equipment only achieves single-pass impurity interception through the surface layer of the filter element, without a pre-filter pretreatment structure or a subsequent cyclone deep purification structure. Large particles of impurities directly impact the precision filter media, easily causing rapid clogging of the filter element, a sudden increase in pressure differential, and shortening the filter element's lifespan. At the same time, the single filtration layer has limited interception capacity for fine particles and suspended oil mist, and tiny impurities can easily penetrate the filtration structure, failing to achieve deep dust and oil removal, resulting in poor purification effect and insufficient operational stability.

[0005] In addition, traditional equipment suffers from a lack of differentiated matching design, resulting in filter media precision that cannot be adapted to the impurity content of the airflow. It cannot achieve step-by-step filtration and purification based on impurity particle size, easily leading to excessive load on the front-end filtration and insufficient purification margin at the back end, resulting in low overall filtration efficiency and rapid degradation of purification effect. Furthermore, traditional equipment has a simple filtration structure, lacking vortex rectification and secondary impurity stripping functions, resulting in strong airflow turbulence and poor impurity separation, further reducing the purification quality of compressed air.

[0006] Therefore, we propose a multi-layer filtration air purification and dust removal device to solve the above problems. Summary of the Invention

[0007] The purpose of this invention is to solve the problems in the prior art by proposing a multi-layer filtration air purification and dust removal device.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A multi-layer filtration air purification and dust removal device includes a mounting frame on which an integrated valve assembly is mounted. The integrated valve assembly includes a three-stage filtration unit, which consists of a primary dust removal component, a secondary oil mist component, and a secondary fine filter component, and is sequentially connected to each other. Each of the three filtration units includes a sedimentation collection cup, which contains a composite filter element structure. A drain is installed at the bottom of the sedimentation collection cup.

[0009] In the aforementioned multi-layer filtration air purification and dust removal equipment, the integrated valve body assembly includes multiple filter valve body housings, which are connected by connectors. Each filter valve body housing is provided with a valve body sealing and pressing end cap, which is connected to the mounting base. A filter element differential pressure monitoring gauge is installed on the filter valve body housing, and the filter element differential pressure monitoring gauge extends upward through the valve body sealing and pressing end cap and the mounting base.

[0010] In the aforementioned multi-layer filtration air purification and dust removal equipment, the lower end of the filter valve body housing is connected to a filter element mounting base. The sedimentation and dust collection filter cup is fitted under the filter element mounting base, and the sedimentation and dust collection filter cup is connected to the air passage inside the filter element mounting base. The filter valve body housing is provided with an air inlet channel and an air outlet channel, and both the air inlet channel and the air outlet channel are connected to the air passage inside the filter element mounting base. The air outlet channel of the filter valve body housing is connected to the air inlet channel of the right side of the filter valve body housing.

[0011] In the aforementioned multi-layer filtration air purification and dust removal equipment, a positioning and locking groove is provided on the outer wall of the filter element mounting base, and a positioning and locking protrusion is provided inside the sedimentation and collection filter cup, and the positioning and locking protrusion is engaged in the corresponding positioning and locking groove.

[0012] In the aforementioned multi-layer filtration air purification and dust removal equipment, the composite filter element structure includes a flow guide net base. Multiple positioning ribs are symmetrically installed on the inner wall of the settling and collecting filter cup, and the flow guide net base is positioned on the positioning ribs. A gap exists between the flow guide net base and the settling and collecting filter cup. An isolation and protective cover is installed on the flow guide net base, and the upper end of the isolation and protective cover is connected to the exhaust channel. A gradient-graded conical filter is installed on the inner wall of the isolation and protective cover. An installation column is provided on the inner top wall of the filter valve body housing. Multiple flow guide spiral filter plates are provided on the outer wall of the installation column, and these flow guide spiral filter plates are located within the gradient-graded conical filter and the isolation and protective cover, and are in contact with the inner wall of the gradient-graded conical filter and the inner wall of the isolation and protective cover.

[0013] In the aforementioned multi-layer filtration air purification and dust removal equipment, a sealing rubber ring and an elastic retaining ring are provided between the filter element mounting base and the sedimentation and dust collection filter cup.

[0014] In the aforementioned multi-layer filtration air purification and dust removal equipment, the guide spiral filter plates are distributed in a spiral shape along the axial direction, and a guide channel is formed between adjacent guide spiral filter plates.

[0015] In the aforementioned multi-layer filtration air purification and dust removal equipment, the gradient-graded conical filter of the primary dust removal component is a coarse glass fiber filter layer, the gradient-graded conical filter of the intermediate oil mist component is a glass fiber condensation layer, and the gradient-graded conical filter of the advanced fine filtration component is a composite fine filtration layer.

[0016] In the aforementioned multi-layer filtration air purification and dust removal equipment, the width of the guide channel of the guide spiral filter in the primary dust removal component, the intermediate oil mist component, and the advanced fine filtration component decreases sequentially.

[0017] Compared with existing technologies, the beneficial effects of the present invention are as follows: 1. This invention features a three-stage filtration structure consisting of a primary dust removal component, a secondary oil mist component, and a senior fine filter component. The precision of the tapered filter material in each of the three filtration units increases progressively, while the width of the flow channel of the guide spiral filter decreases sequentially, forming a filtration process from coarse filtration and oil condensation to deep fine filtration. The primary dust removal component specifically intercepts large solid particles, the secondary oil mist component condenses and separates water mist and oil mist, and the senior fine filter component captures ultrafine dust and oil vapor. This targeted treatment of pollutants of different particle sizes and types completely solves the problem of single-stage filters and incomplete purification, significantly improving the overall cleanliness of compressed air.

[0018] 2. This invention changes the traditional single-layer filtration structure. Each filtration unit includes a flow net base for initial filtration, a gradient-graded conical filter for fine filtration, and a guide spiral filter for deep swirl filtration. The airflow first passes through the flow net base to intercept large particles of impurities, completing the initial pretreatment. Then, the gradient-graded conical filter finely intercepts fine dust and oil mist. Finally, the guide spiral filter performs swirl rectification and secondary impurity removal. Multiple filtration layers effectively improve the impurity interception rate, prevent tiny particles from penetrating the filter layer, and significantly improve the air dust removal and oil removal purification accuracy. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a multi-layer filtration air purification and dust removal device proposed in this invention. Figure 2 This is a schematic diagram of the structure of a multi-layer filtration air purification and dust removal device proposed in this invention; Figure 3 In the multi-layer filtration air purification and dust removal device proposed in this invention Figure 2 The main view; Figure 4 This is a schematic diagram of the structure of one of the filter units in a multi-layer filtration air purification and dust removal device proposed in this invention; Figure 5 In the multi-layer filtration air purification and dust removal device proposed in this invention Figure 4 The main view; Figure 6 In the multi-layer filtration air purification and dust removal device proposed in this invention Figure 4 A schematic diagram of the structure after removing the mounting column, flow guide spiral filter, flow guide spiral filter, filter element differential pressure monitoring gauge, and valve body sealing and pressing end cap; Figure 7 This is a schematic diagram of the internal structure of the filter valve body housing in a multi-layer filtration air purification and dust removal device proposed in this invention. Figure 8 This is a perspective view of the main housing of the filter valve body in a multi-layer filtration air purification and dust removal device proposed in this invention. Figure 9 This is a schematic diagram of the internal structure of the sedimentation and dust collection filter cup in a multi-layer filtration air purification and dust removal device proposed in this invention.

[0020] In the diagram: 1. Mounting base; 2. Filter element differential pressure monitoring gauge; 3. Valve body sealing and pressing end cap; 4. Filter valve body main body shell; 5. Settling and collecting filter cup; 6. Guide net base; 7. Isolation and protective cover; 8. Gradient-graded conical filter screen; 9. Mounting column; 10. Guide spiral filter disc; 11. Air inlet channel; 12. Filter element mounting seat; 13. Exhaust channel; 14. Drain; 15. Sealing ring; 16. Elastic retaining ring; 17. Positioning rib; 18. Positioning and locking protrusion; 19. Positioning and locking groove. Detailed Implementation

[0021] The following examples are for illustrative purposes only and are not intended to limit the scope of the invention. Example

[0022] Reference Figure 1-9 A multi-layer filtration air purification and dust removal device includes a mounting frame 1, on which an integrated valve body assembly is mounted. The integrated valve body assembly includes multiple filter valve body housings 4, which are connected by connectors. Each filter valve body housing 4 has a valve body sealing and pressing end cap 3, which is connected to the mounting frame 1. The valve body sealing and pressing end cap 3 is mounted on the top of each filter valve body housing 4, which can seal and protect the internal air passage of the valve body, effectively preventing airflow leakage during high-pressure operation and ensuring the sealing and stability of air passage transmission. A filter element differential pressure monitoring gauge 2 is mounted on each filter valve body housing 4, extending upwards through the valve body sealing and pressing end cap 3 and the mounting frame 1. The gauge can monitor the pressure difference between the inlet and outlet of each filter element in real time, accurately reflecting the filter element blockage status. When the filter element is clean, airflow resistance is low and the differential pressure is low; when the filter element is clogged, airflow resistance increases and the differential pressure rises, enabling early warning of filter element clogging faults without disassembling the machine for inspection, greatly improving the convenience of equipment maintenance. The filter element differential pressure monitoring table 2 independently corresponds to the operating conditions of a single-stage filtration unit, which can accurately locate single-stage filter element clogging problems, avoiding overall troubleshooting and further improving equipment operation and maintenance efficiency and inspection accuracy.

[0023] The integrated valve assembly includes a three-stage filtration unit, consisting of a primary dust removal component, a secondary oil mist component, and a secondary fine filtration component, which are sequentially connected. Each stage of the filtration unit includes a sedimentation collection cup 5, which contains a composite filter element. A drain 14 is installed at the bottom of the sedimentation collection cup 5. Wastewater, oil, and solid impurities generated by each stage of the filtration unit are collected at the bottom of the sedimentation collection cup 5. Automated timed drainage is achieved through the drain 14 installed at the bottom of the sedimentation collection cup 5, eliminating the need for manual operation. This ensures long-term continuous operation of the equipment and effectively improves the continuity and stability of dust and oil removal purification. The three-stage filtration unit adopts a series progressive layout to achieve graded treatment of impurities, avoiding the defects of traditional single-stage filtration such as concentrated load and easy rapid clogging, and is suitable for long-term continuous industrial ventilation conditions.

[0024] The lower end of the filter valve body housing 4 is connected to a filter element mounting base 12. The sedimentation and sludge collection cup 5 is fitted under the filter element mounting base 12. A sealing rubber ring 15 and an elastic retaining ring 16 are provided between the filter element mounting base 12 and the sedimentation and sludge collection cup 5, forming a double sealing and axial limiting structure, which can effectively prevent equipment leakage and component loosening under high pressure conditions, and improve the stability of equipment operation. A positioning and locking groove 19 is provided on the outer wall of the filter element mounting base 12, and a positioning lock is provided inside the sedimentation and sludge collection cup 5. The locking protrusion 18 and the positioning locking fastener 18 are engaged in the corresponding positioning locking groove 19. Through the engagement of the positioning locking protrusion 18 and the positioning locking groove 19, the sedimentation and sludge collection filter cup 5 and the filter element mounting base 12 can be quickly aligned and disassembled. The assembly structure is simple and convenient. The sealing ring 15 achieves radial airtightness sealing, and the elastic retaining ring 16 achieves axial locking and limiting. The dual structures work together to balance high-pressure sealing performance and ease of disassembly and assembly, making it suitable for high-pressure compressed air working environments.

[0025] The sedimentation and collection filter cup 5 is connected to the air passage inside the filter element mounting base 12. The filter valve body housing 4 has an air inlet channel 11 and an exhaust channel 13 inside, and both the air inlet channel 11 and the exhaust channel 13 are connected to the air passage inside the filter element mounting base 12. The exhaust channel 13 of the filter valve body housing 4 is connected to the air inlet channel 11 of the right side of the filter valve body housing 4. The air passages of each stage of the filter valve body housing 4 are independently connected and connected end to end, forming a complete step-by-step purification air passage. The airflow flows in a unidirectional and orderly manner, without turbulence or cross-flow, ensuring that the filtration operation is carried out in an orderly manner.

[0026] The composite filter structure includes a guide net base 6, multiple positioning ribs 17 symmetrically installed on the inner wall of the settling and collecting filter cup 5, and the guide net base 6 is set on the positioning ribs 17. There is a gap between the guide net base 6 and the settling and collecting filter cup 5. An isolation and protective cover 7 is installed on the guide net base 6, and the upper end of the isolation and protective cover 7 is connected to the exhaust channel 13. The inner wall of the isolation and protective cover 7 is equipped with a gradient-graded conical filter 8. The gradient-graded conical filter 8 of the primary dust removal component is a coarse glass fiber filter layer, the gradient-graded conical filter 8 of the intermediate oil mist component is a glass fiber condensation layer, and the advanced fine filter component... The gradient-grade conical filter 8 is a composite fine filtration layer. The inner top wall of the filter valve body housing 4 is equipped with mounting posts 9. Multiple guide spiral filter elements 10 are mounted on the outer wall of the mounting posts 9. These guide spiral filter elements 10 are located within the gradient-grade conical filter 8 and the protective outer casing 7, and are in contact with the inner walls of both the gradient-grade conical filter 8 and the protective outer casing 7. The guide spiral filter elements 10 are spirally distributed along the axial direction, forming guide channels between adjacent elements. The width of the guide channels for the guide spiral filter elements 10 in the primary dust removal component, intermediate oil mist component, and advanced fine filtration component decreases sequentially. The three-stage filtration unit adopts a differentiated gradient matching design, with progressively increasing filter precision and progressively decreasing guide channel width. This perfectly adapts to the progressively decreasing particle size and content of impurities in the airflow, achieving precise graded filtration and significantly improving overall purification efficiency and filtration uniformity.

[0027] This invention is a multi-stage progressive air purification and dust removal device. It employs a working principle of coarse filtration, medium filtration, and fine filtration, progressively purifying the air. The air to be purified flows sequentially through a primary dust removal component, a medium oil mist component, and a high-level fine filtration component, removing dust, water droplets, oil mist, and fine oil stains from the air step by step, achieving comprehensive air purification. The entire device is fixedly assembled on a mounting frame 1, which ensures overall structural stability during operation.

[0028] Compressed air containing impurities is first introduced into the main housing 4 of the filter valve body of the primary dust removal unit through the air intake channel 11 of the integrated valve body assembly. The air then enters the filter element mounting base 12 through the air intake channel 11 of the filter valve body 4 and is finally delivered downwards to the sedimentation and sludge collection cup 5. The inner wall of the sedimentation and sludge collection cup 5 is fixedly provided with positioning ribs 17, which support and limit the bottom guide net base 6, so that the guide net base 6 is suspended in the air. A gap is reserved between the guide net base 6 and the bottom of the sedimentation and sludge collection cup 5, which can ensure that the sewage and oil generated by filtration and separation can settle smoothly to the bottom of the sedimentation and sludge collection cup 5, and avoid impurities accumulating below and affecting the filtration operation. After entering the sedimentation and collection filter cup 5, the air is positioned between the sedimentation and collection filter cup 5 and the protective outer cover 7. It then enters the protective outer cover 7 from the bottom of the guide net base 6. Under air pressure, the external air flows upwards from the bottom through the guide net base 6, where it undergoes initial filtration, trapping large particles and fibrous contaminants. This first stage of coarse filtration allows the air to enter the internal cavity of the protective outer cover 7. This bottom-intake, upward-filtering airflow path utilizes gravity to naturally settle large particles, reducing the direct impact of large particles on the precision filter material, effectively reducing the filter element's filtration load and extending its overall service life.

[0029] The gas entering the protective enclosure 7 passes through the gradient-graded conical filter 8 from the outside in, completing the second stage of fine filtration and further intercepting fine dust, water mist, and oil mist particles in the air. This equipment's three-stage filtration unit adopts a differentiated gradient structure design, with filtration accuracy increasing progressively. Furthermore, the width of the guide channel of the flow-guiding spiral filter 10 in each of the three stages decreases sequentially, adapting to the filtration characteristics of progressively reducing airflow impurities. The first-stage primary dust removal component uses a gradient-graded conical filter 8 made of coarse glass fiber, paired with the widest guide channel of the flow-guiding spiral filter 10. This is primarily used to intercept large-particle solid impurities such as rust, silt, and large dust particles, preemptively retaining most large particulate pollutants and effectively preventing rapid clogging and failure of the downstream precision filter element. The second-stage intermediate oil mist filter uses a gradient-graded conical filter 8 made of glass fiber condensing material, paired with a medium-width guide spiral filter 10. It focuses on processing fine water mist and suspended oil mist in the air, condensing dispersed micro-oil mist and water mist into larger droplets. These droplets settle along the inner wall of the sedimentation collection cup 5 to the bottom, achieving the core functions of removing water and oil mist from the air. The third-stage advanced fine filter uses a gradient-graded conical filter 8 made of high-precision composite material, paired with the narrowest guide spiral filter 10. This finest filtration structure accurately captures residual ultrafine dust, oil vapor, and trace suspended particles after the first two stages of filtration, providing deep air purification and ensuring the cleanliness of the final exhaust air.

[0030] After the gas penetrates the gradient-graded conical filter 8 and enters the inner cavity of the filter 8, it continues to flow through the guide spiral filter 10. The gap structure of the guide spiral filter 10 completes deep filtration and swirling separation. The guide spiral filter 10 can rectify and guide the airflow, while the spiral structure further intercepts fine impurities and removes residual oil mist, causing the tiny impurities to be thrown off and separated under the swirling action, further improving air purification accuracy. The advanced fine filtration component adopts a high-density composite fine filter layer combined with a closely spaced guide spiral filter structure. Relying on the fine filter material pore size and spiral swirling guiding characteristics, it can stably intercept ultrafine impurities and oil vapor. The gradient filtration layout significantly reduces the impurity load on the fine filter layer, effectively alleviating the clogging rate of the fine filter material and avoiding the problem of rapid filtration effect decay. This ensures long-term stable and high-precision purification performance of the equipment. The structure is simple, with a low failure rate, and long-term precision filtration can be achieved without the need for a rotating auxiliary structure.

[0031] After completing three progressive filtration stages (primary filtration at the guide mesh base 6, fine filtration at the gradient-grade conical filter 8, and secondary filtration at the guide spiral filter 10), the clean air flows upward through the filter element mounting base 12 and is finally discharged from the exhaust channel 13 of the filter valve body housing 4, smoothly entering the intake channel 11 of the next stage filter valve body housing 4, thus achieving three-stage continuous progressive filtration. Each filtration unit has an independent triple filtration mechanism, ensuring thorough and step-by-step purification. Compared with traditional single-layer filtration structures, the purification is more thorough and precise, effectively meeting the high-precision air requirements of industrial applications.

[0032] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A multi-layer filtration air purification and dust removal device, comprising a mounting base (1), characterized in that: An integrated valve body assembly is installed on the mounting base (1). The integrated valve body assembly includes a three-stage filtration unit, which consists of a primary dust removal component, a secondary oil mist component, and a high-level fine filtration component. The primary dust removal component, the secondary oil mist component, and the high-level fine filtration component are connected in sequence. Each of the three-stage filtration units includes a sedimentation collection cup (5). A composite filter element structure is installed inside the sedimentation collection cup (5). A drainer (14) is installed at the bottom of the sedimentation collection cup (5).

2. The multi-layer filtration air purification and dust removal device according to claim 1, characterized in that: The integrated valve body assembly includes multiple filter valve body housings (4), and the filter valve body housings (4) are connected by connectors. The filter valve body housing (4) is provided with a valve body sealing and pressing end cap (3), and the valve body sealing and pressing end cap (3) is connected to the mounting base (1). The filter valve body housing (4) is equipped with a filter element differential pressure monitoring gauge (2), and the filter element differential pressure monitoring gauge (2) extends upward through the valve body sealing and pressing end cap (3) and the mounting base (1).

3. The multi-layer filtration air purification and dust removal device according to claim 2, characterized in that: The lower end of the filter valve body housing (4) is connected to the filter element mounting base (12). The sedimentation and dirt collection filter cup (5) is sleeved under the filter element mounting base (12), and the sedimentation and dirt collection filter cup (5) is connected to the air passage inside the filter element mounting base (12). The filter valve body housing (4) is provided with an air inlet channel (11) and an exhaust channel (13), and both the air inlet channel (11) and the exhaust channel (13) are connected to the air passage inside the filter element mounting base (12). The exhaust channel (13) of the filter valve body housing (4) is connected to the air inlet channel (11) of the right side filter valve body housing (4).

4. The multi-layer filtration air purification and dust removal device according to claim 3, characterized in that: The outer wall of the filter element mounting base (12) is provided with a positioning and locking groove (19), and the sedimentation and sludge collection filter cup (5) is provided with a positioning and locking protrusion (18), and the positioning and locking protrusion (18) is locked in the corresponding positioning and locking groove (19).

5. The multi-layer filtration air purification and dust removal device according to claim 3, characterized in that: The composite filter structure includes a flow guide base (6), and multiple positioning ribs (17) are symmetrically installed on the inner side wall of the sedimentation and sludge collection filter cup (5). The flow guide base (6) is set on the positioning ribs (17). There is a gap between the flow guide base (6) and the sedimentation and sludge collection filter cup (5). An isolation protective cover (7) is installed on the flow guide base (6), and the upper end of the isolation protective cover (7) is connected to the exhaust channel (13). A gradient graded conical filter screen (8) is installed on the inner wall of the isolation protective cover (7). An installation column (9) is provided on the inner top wall of the filter valve body housing (4). Multiple flow guide spiral filter plates (10) are provided on the outer side wall of the installation column (9). The flow guide spiral filter plates (10) are located inside the gradient graded conical filter screen (8) and the isolation protective cover (7) and are in contact with the inner wall of the gradient graded conical filter screen (8) and the inner wall of the isolation protective cover (7).

6. The multi-layer filtration air purification and dust removal device according to claim 4, characterized in that: A sealing ring (15) and an elastic retaining ring (16) are provided between the filter element mounting base (12) and the sedimentation and sludge collection filter cup (5).

7. The multi-layer filtration air purification and dust removal device according to claim 5, characterized in that: The flow-guiding spiral filter (10) is distributed in a spiral shape along the axial direction, and a flow-guiding channel is formed between adjacent flow-guiding spiral filter (10).

8. The multi-layer filtration air purification and dust removal device according to claim 5, characterized in that: The gradient-graded conical filter (8) of the primary dust removal component is a glass fiber coarse filter layer, the gradient-graded conical filter (8) of the intermediate oil mist component is a glass fiber condensation layer, and the gradient-graded conical filter (8) of the advanced fine filter component is a composite fine filter layer.

9. The multi-layer filtration air purification and dust removal device according to claim 5, characterized in that: The width of the guide channel of the guide spiral filter (10) in the primary dust removal component, intermediate oil mist component and advanced fine filtration component decreases in sequence.

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