A composite air cleaner with active dust removal

Abstract

The application belongs to the technical field of air filters, and particularly relates to a composite air filter with active dust removal, which comprises a prefilter shell, a prefilter air inlet is fixedly installed on one side of the prefilter shell, an inertial prefilter unit, a back-blowing dust removal unit, a second-stage interception filtering unit and a dust extraction unit are arranged in the prefilter shell, a dust-blocking arc plate is fixedly installed in the prefilter air inlet, and the dust-blocking arc plate is an arc-shaped dust-blocking plate. The inertial prefilter unit is used for performing cyclone separation on dust-containing air, the second-stage interception filtering unit is used for performing fine filtration on coarse-filtered air, the dust extraction unit is used in cooperation with the back-blowing dust removal unit to completely remove the blown dust from the filter, one cycle of active dust removal is completed, the four units can form a closed-loop working process of coarse filtration, fine filtration, dust collection, back blowing and dust removal, automatic, continuous and efficient air purification and self-dust removal of the filter are realized, the maintenance cycle of the filter can be greatly prolonged, and the use requirements of vehicles in high-dust environments can be met.

Description

Technical Field

[0001] This invention relates to the field of air filter technology, specifically to a composite air filter with active dust removal. Background Technology

[0002] An air filter, also known simply as an air filter, is a fluid filtration device that captures solid impurities, dust, and particulate matter in the air through a filter medium, providing clean air to downstream equipment or devices. Its core components include the filter medium, housing, air inlet and outlet, and seals. It is widely used in internal combustion engines (such as automobiles, construction machinery, generators, etc.), air compressors, ventilation systems, precision equipment, new energy battery systems, and other fields. It is a core basic component that ensures the normal operation of equipment and extends its service life.

[0003] As the first line of defense for engine protection, the air filter is a crucial component that prevents dust and impurities from entering the engine. Vehicles operating in high-dust environments are typically equipped with desert air filters, which are generally a composite structure of a cyclone pre-filter and an interceptor air filter element. However, in actual use, desert air filters often suffer from reduced efficiency due to poor dust removal by the axial flow pre-filter, leading to increased dust load on the air filter element and frequent filter maintenance. As a result, many OEMs in the market tend to use composite air filters with oil bath pre-filters and air filters, which in turn leads to problems such as oil pollution, complex maintenance, and increased workload. To address this, some well-known filter companies have adopted technical measures, such as making the dust collection box under the pre-filter transparent to facilitate observation of dust accumulation and allow users to promptly identify and empty the dust from the pre-filter.

[0004] In current technologies, this method often results in the dust collection box surface being covered with dust and difficult to observe in practical applications. Even if it can be seen clearly, manual cleaning requires frequent operation, and the large amount of dust is not only detrimental to the health of operators, but also fails to meet the actual dust removal needs of desert filters.

[0005] Therefore, the present invention provides a composite air filter with active dust removal. Summary of the Invention

[0006] To overcome the shortcomings of the prior art and solve at least one of the technical problems mentioned in the background art, the present invention provides a composite air filter with active dust removal, which can actively remove dust accumulated in the pre-filter on the basis of conventional desert air filters, ensure the efficiency of the pre-filter, and achieve the goal of long maintenance cycle of desert filters.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: The present invention provides an active dust removal composite air filter, including a pre-filter housing, a pre-filter inlet fixedly installed on one side of the pre-filter housing, an inertial pre-filter unit, a back-blowing dust removal unit, a second-stage interception filter unit and a dust extraction unit arranged inside the pre-filter inlet, a dust-blocking arc plate fixedly installed inside the pre-filter inlet, the dust-blocking arc plate being an arc-shaped dust baffle plate, slag outlets symmetrically opened on the inner wall of the pre-filter inlet, the two slag outlets being respectively placed on one side of the dust-blocking arc plate, a perforation assembly arranged inside the pre-filter inlet, the perforation assembly being placed below the dust-blocking arc plate, the perforation assembly including a punch rod, the perforation assembly being used to clear the airflow holes on the inner wall of the dust-blocking arc plate through the punch rod, and a flow measuring assembly arranged inside the pre-filter inlet, the flow measuring assembly being placed below the perforation assembly, the flow measuring assembly being used to detect the wind force flowing from the dust-blocking arc plate.

[0008] Preferably, the inertial pre-filter unit mainly comprises several pre-filter reverse cyclone tubes, a dust collection chamber, a dust discharge port, a pre-filter air collection chamber, and a pre-filter air outlet. Several pre-filter reverse cyclone tubes are fixedly installed inside the pre-filter housing. The dust collection chamber is fixedly installed at the bottom of the pre-filter housing. The dust discharge port is opened on the lowest inner wall of the dust collection chamber. The dust extraction unit is set inside the dust discharge port. The reverse cyclone tube can be divided into three parts: cyclone tube module one, cyclone tube module two, and cyclone tube module three. A pre-filter flow regulating gate is provided at the inlet of cyclone tube module two. The pre-filter air collection chamber is fixedly installed on the top of the pre-filter housing, and the pre-filter air outlet is opened at one end of the pre-filter air collection chamber.

[0009] Preferably, the back-flushing dust removal unit comprises a compressed air tank, a back-flushing valve, a back-flushing pipe, and a back-flushing controller. The compressed air tank and the back-flushing controller are both fixedly installed on the pre-filter housing. One end of the back-flushing pipe is fixedly connected to the inner wall of the back-flushing valve, and the other end of the back-flushing pipe passes through the inner wall of the pre-filter housing and is placed inside the dust collection chamber. The outlet position of the back-flushing pipe corresponds to the position of the dust discharge port. The back-flushing controller is placed on one side of the compressed air tank. A back-flushing nozzle is fixedly installed at the outlet end of the back-flushing pipe. The back-flushing nozzle includes a connecting section. The outlet end of the back-flushing pipe is fixedly connected to the outer wall of the connecting section. A support rod is fixedly installed at the bottom of the connecting section, and a guide cone is fixedly installed inside the support rod.

[0010] Preferably, the second-stage interception and filtration unit comprises a filter housing, a filter element, a filter maintenance door, and an air filter outlet. The bottom of the filter housing is fixedly connected to the top of the pre-filter housing. The air filter outlet is fixedly installed on one side of the filter housing. The air filter element is fixedly installed inside the filter housing and placed between the air filter outlet and the filter housing. An air filter resistance test interface is provided on the inner wall of the air filter outlet.

[0011] Preferably, the dust extraction unit includes a dust discharge check valve, which is fixedly installed at the bottom of the dust collection chamber. A dust extraction pump is connected inside the dust collection chamber, and a dust discharge nozzle is provided outside the dust extraction pump.

[0012] Preferably, the perforation assembly further includes a first perforation plate and two second perforation plates. Multiple poking rods are respectively fixedly installed on the top of the first perforation plate and the two second perforation plates. The tops of the first perforation plate and the two second perforation plates are symmetrically opened in an oblique flow shape. The first perforation plate is placed between the two second perforation plates, and the first perforation plate and the two second perforation plates are staggered. The outer walls of the first perforation plate and the two second perforation plates can be slidably connected to the inner wall of the pre-filter inlet. A replacement component is provided between the first perforation plate and the two poking rods.

[0013] Preferably, the replacement component includes an electric telescopic rod, which is fixedly installed on the outer wall of the pre-filter inlet. A replacement plate is fixedly installed at the output end of the electric telescopic rod. The outer wall of the replacement plate penetrates the inner wall of the pre-filter inlet and is fixedly connected to the outer wall of the first perforated plate. A shift plate is symmetrically slidably connected to the outer wall of the pre-filter inlet. The outer walls of the two shift plates penetrate the inner wall of the pre-filter inlet and are fixedly connected to the outer walls of the two second perforated plates. Gears are symmetrically rotatably connected to the outer wall of the pre-filter inlet. Toothed rods are fixedly installed on both outer walls of the replacement plate and one side of the two shift plates. The four toothed rods are respectively placed on both sides of the two gears, and the teeth on the four toothed rods can mesh with the teeth on the two gears in pairs.

[0014] Preferably, the flow measurement assembly includes two cavity shafts, each with a pressure sensor fixedly installed inside. Each pressure sensor has a pressure-transmitting spring on one side, and the two pressure-transmitting springs are respectively placed inside the two cavity shafts. Each cavity shaft has an arc-shaped push rod inside, and the two arc-shaped push rods can respectively fit into contact with one side of the two pressure-transmitting springs. A pressure transmission assembly is arranged above the two cavity shafts.

[0015] Preferably, the pressure transmission assembly includes two hinge shafts, each hinge shaft has a baffle hinged to its outer wall, the tops of two arc-shaped push rods are fixedly connected to the bottoms of the two baffles respectively, and a return spring is provided between the bottom of the two baffles and the outer walls of the two cavity shafts, and one side of the two baffles can fit into contact with each other.

[0016] Preferably, dust extraction valves are symmetrically fixedly installed on the outer wall of the pre-filter air inlet, and suction pipes are symmetrically fixedly installed on the outer walls of both chambers. One end of each of the four suction pipes is fixedly connected to the outer wall of the two dust extraction valves.

[0017] The beneficial effects of this invention are as follows: 1. The present invention discloses an active dust removal composite air filter, which uses an inertial pre-filter unit to swirl and separate dust-laden air, a second-stage interception filter unit to finely filter coarse air, and a dust extraction unit in conjunction with a back-blowing dust removal unit to completely remove the blown dust from the filter, thus completing one active dust removal cycle. The four units can form a closed-loop workflow of coarse filtration, fine filtration, dust collection, back-blowing, and dust removal, realizing automatic, continuous, and efficient air purification and self-dust removal of the filter, which can significantly extend the filter maintenance cycle and meet the usage needs of vehicles in high-dust environments.

[0018] 2. The composite air filter with active dust removal described in this invention uses a dust-blocking arc plate to block and filter larger dust and debris in the air. The flow measurement component continuously detects the airflow. When the flow measurement component detects that the airflow in the pre-filter inlet decreases, the pore-clearing component is activated to poke and clear the airflow holes on the inner wall of the dust-blocking arc plate with a poking rod. This allows for preliminary filtration of the airflow before it enters the pre-filter housing, blocking larger dust and debris and preventing scratches on the inner wall structure during subsequent operations. Attached Figure Description

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] Figure 1 This is an overall diagram of the invention; Figure 2 This is a main body diagram of the present invention; Figure 3 This is the front view of the present invention; Figure 4 This is a rear view of the present invention; Figure 5 This is the left view of the present invention; Figure 6 This is the right view of the present invention; Figure 7 This is a top view of the present invention; Figure 8 This is a schematic diagram of the gas flow direction for dust collection and cleaning in this invention; Figure 9 This is a structural diagram of the backflush nozzle in this invention; Figure 10 This is a schematic diagram of the partitioned air intake structure in this invention; Figure 11 This is a structural diagram of the single-stage pre-filter in this invention; Figure 12 This is a diagram illustrating the composition of a single-stage pre-filter in this invention; Figure 13 This is a diagram showing the internal structure of the present invention; Figure 14 This is a schematic diagram of the structure of the dust-blocking arc plate in this invention; Figure 15 This is a schematic diagram of the structure of the shield in this invention; Figure 16 This is a schematic diagram of the structure of the arc-shaped push rod in this invention; Figure 17 This is a schematic diagram of the structure at the connecting rod in this invention; Figure 18 This is a schematic diagram of the structure of the replacement plate in this invention.

[0021] In the diagram: 1. Inertial pre-filter unit; 11. Pre-filter inlet; 111. Cyclone tube module one; 112. Cyclone tube module two; 113. Cyclone tube module three; 114. Pre-filter flow regulating gate; 12. Pre-filter housing; 13. Reverse cyclone tube; 14. Dust collection chamber; 15. Dust outlet; 16. Pre-filter air collection chamber; 17. Pre-filter air outlet; 2. Backflush dust removal unit; 21. Compressed air tank; 22. Backflush valve; 23. Backflush pipe; 24. Backflush controller; 25. Connecting section; 26. Guide cone; 27. Support rod; 3. Second-stage interception filtration unit; 31. Filter housing; 32. Filter element; 33. Filter element support. 34. Protective door; 35. Air filter outlet; 4. Air filter resistance test interface; 5. Dust extraction unit; 6. Dust exhaust check valve; 7. Dust extraction pump; 8. Dust exhaust duckbill; 9. Chamber box; 10. Dust extraction valve; 11. Suction pipe; 12. Slag outlet; 13. Dust blocking arc plate; 14. Hole plate one; 15. Hole plate two; 16. Stamping rod; 17. Cover plate; 18. Hinge shaft; 19. Arc-shaped push rod; 10. Reset spring; 11. Chamber shaft; 12. Pressure sensor; 13. Pressure transmission spring; 14. Electric telescopic rod; 15. Gear rack; 16. Shift plate; 17. Gear; 18. Replacement plate. Detailed Implementation

[0022] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0023] like Figures 1 to 18As shown in the embodiment of the present invention, an active dust removal composite air filter includes a pre-filter housing 12. A pre-filter inlet 11 is fixedly installed on one side of the pre-filter housing 12. The pre-filter housing 12 is internally equipped with an inertial pre-filter unit 1, a back-blowing dust removal unit 2, a second-stage interception filter unit 3, and a dust extraction unit 4. The inertial pre-filter unit 1 is used to achieve initial dust separation of dust-laden air using the principle of inertial vortex. The back-blowing dust removal unit 2 is used to generate high-pressure air waves with compressed air, agitate the dust, and blow it out of the pre-filter housing 12. The second-stage interception filter unit 3 is used to perform deep purification of the air after coarse filtration by the inertial pre-filter unit 1. The dust extraction unit 4 is used in conjunction with the back-blowing dust removal unit 2 to quickly and thoroughly discharge the dust blown by the high-pressure air waves outside the filter. The back-blowing dust removal unit 2 is located on one side of the inertial pre-filter unit 1. The secondary interception and filtration unit 3 is located at the top of the inertial pre-filter unit 1, and the dust extraction unit 4 is located below the inertial pre-filter unit 1. A dust-blocking arc plate 6 is fixedly installed inside the pre-filter inlet 11. The dust-blocking arc plate 6 is an arc-shaped dust baffle plate used to block larger particles and dust in the air. The inner wall of the pre-filter inlet 11 is symmetrically provided with slag outlets 503. The two slag outlets 503 are respectively located on one side of the dust-blocking arc plate 6. A perforation assembly is provided inside the pre-filter inlet 11. The perforation assembly is located below the dust-blocking arc plate 6. The perforation assembly includes a punch rod 702. The perforation assembly is used to clear the airflow holes on the inner wall of the dust-blocking arc plate 6 through the punch rod 702. A flow measuring assembly is provided inside the pre-filter inlet 11. The flow measuring assembly is located below the perforation assembly. The flow measuring assembly is used to detect the wind force flowing from the dust-blocking arc plate 6. In practical applications, the surface of the dust collection box is often covered with dust, making it difficult to observe. Even if it can be seen clearly, manual cleaning is required frequently. Moreover, the large amount of dust is not only detrimental to the health of operators, but also makes it difficult to meet the actual dust removal needs of the desert filter. When air filtration is required, air enters the pre-filter housing 12 through the pre-filter inlet 11. As the air flows from the pre-filter inlet 11 into the pre-filter housing 12, the dust-blocking arc plate 6 blocks and filters larger dust particles and debris. The flow rate is continuously monitored by the flow measurement component. When the flow measurement component detects a decrease in the flow rate within the pre-filter inlet 11, it indicates that the dust and debris blocked on the dust-blocking arc plate 6 are clogging the internal airflow holes, affecting the normal airflow. The pore-clearing component is then activated. The pore-clearing component uses the puncturing rod 702 to puncture and clear the airflow holes on the inner wall of the dust-blocking arc plate 6. This provides preliminary filtration of the airflow before it enters the pre-filter housing 12, blocking larger dust particles and preventing scratches to the inner wall structure during subsequent operations. When the airflow enters the pre-filter housing 12 through the pre-filter inlet 11, the pre-filter... The inertial pre-filter unit 1 inside the housing 12 will cause the dust-laden air in the incoming airflow to be separated by swirling flow in the inertial pre-filter unit 1. Coarse dust will be deposited, and clean air will enter the secondary filter for coarse filtration. After the air passes through the inertial pre-filter unit 1, the second-stage interception filter unit 3 will perform fine filtration on the coarse air, filtering out fine dust and providing clean intake air for the engine, performing deep fine filtration. At the same time, the back-blowing dust removal unit 2 releases high-pressure air waves at a preset cycle, agitating the dust and blowing it out of the pre-filter housing 12 for timed dust removal. When the back-blowing dust removal unit 2 is working, the dust extraction unit 4 will be turned on in advance to completely remove the blown dust from the filter, completing one active dust removal cycle and finally achieving dust removal. The four units form a closed-loop workflow of coarse filtration, fine filtration, dust collection, back-blowing, and dust removal, realizing automatic, continuous, and efficient air purification and self-dust removal of the filter, which can significantly extend the filter maintenance cycle and meet the usage needs of vehicles in high-dust environments.

[0024] like Figures 1 to 13 As shown, the inertial pre-filter unit 1 mainly consists of several pre-filter reverse cyclone tubes 13, a dust collection chamber 14, a dust discharge port 15, a pre-filter air collection chamber 16, and a pre-filter air outlet 17. Several pre-filter reverse cyclone tubes 13 are fixedly installed inside the pre-filter housing 12. The dust collection chamber 14 is fixedly installed below the pre-filter housing 12. The dust discharge port 15 is opened on the lowest inner wall of the dust collection chamber 14. The dust extraction unit 4 is set inside the dust discharge port 15. The reverse cyclone tube 13 can be divided into three parts: cyclone tube module one 111, cyclone tube module two 112, and cyclone tube module three 113. A pre-filter flow rate regulating gate 114 is provided at the inlet of cyclone tube module two 112. The pre-filter air collection chamber 16 is fixedly installed on the top of the pre-filter housing 12. The pre-filter air outlet 17 is opened at one end of the pre-filter air collection chamber 16. The inertial pre-filter unit 1 primarily relies on the principle of inertial swirling to achieve initial dust separation of dust-laden air. It separates and collects most of the coarse dust particles from the airflow, significantly reducing the dust load on the subsequent second-stage interceptor filter unit 3, which is fundamental to ensuring the filter's high separation efficiency. During operation, this unit guides the dust-laden air to form a high-speed swirling flow through the axial intake reverse swirling tube 13. Utilizing the inertial difference between dust and air, the dust is thrown against the inner wall of the swirling tube and settles into the lower dust collection chamber 14, completing the initial air-dust separation and ensuring that the single-stage separation efficiency is not lower than the design value within the engine's full intake volume range. Its intake channel is divided into three parts. The middle channel is equipped with an intake regulating valve. When the engine is at low speed, the regulating valve automatically closes, allowing air to enter only through the two side channels, ensuring that the air volume of the swirling tube is always within the high-efficiency design range and preventing a decrease in separation efficiency under low intake volume. After cyclone separation, the dust is deposited in the dust collection chamber 14 at the bottom of the cyclone tube, achieving centralized temporary storage of the dust and providing conditions for precise dust removal by the subsequent back-flushing dust removal unit 2. The clean air after the initial purification is guided from the central tube of the cyclone tube to the second-stage interception filter unit 3. At the same time, this unit can be used independently as a self-exhausting dust pre-filter, delivering the coarsely filtered air to the external fine filter device through the pre-filter outlet 17. It can achieve constant resistance operation, requires no manual maintenance, and its separation efficiency is not less than 95% throughout the process, which can significantly reduce the dust load of the secondary filter element 32.

[0025] like Figures 1 to 13 As shown, the back-blowing dust removal unit 2 includes a compressed air tank 21, a back-blowing valve 22, a back-blowing pipe 23, and a back-blowing controller 24. The compressed air tank 21 and the back-blowing controller 24 are both fixedly installed on the pre-filter housing 12. One end of the back-blowing pipe 23 is fixedly connected to the inner wall of the back-blowing valve 22, and the other end of the back-blowing pipe 23 passes through the inner wall of the pre-filter housing 12 and is placed inside the dust collection chamber 14. The outlet position of the back-blowing pipe 23 corresponds to the position of the dust discharge port 15. The back-blowing controller 24 is placed on one side of the compressed air tank 21. A back-blowing nozzle is fixedly installed at the outlet end of the back-blowing pipe 23. The back-blowing nozzle includes a connecting section 25. The outlet end of the back-blowing pipe 23 is fixedly connected to the outer wall of the connecting section 25. A support rod 27 is fixedly installed at the bottom of the connecting section 25. A guide cone 26 is fixedly installed inside the support rod 27. The back-flushing dust removal unit 2 is the core unit for active dust removal. It primarily uses compressed air to create high-pressure air waves, agitating the dust deposited in the dust collection chamber 14 and blowing it towards the dust discharge port 15. This provides power for the dust discharge from the dust extraction unit 4, achieving active cleaning of the dust collection chamber 14 and solving the problem of poor dust removal in traditional pre-filters. High-pressure compressed air is stored in the compressed air tank 21. The back-flushing controller 24 issues commands according to a preset cycle to control the back-flushing valve 22 to open, achieving timed and quantitative release of high-pressure airflow. The back-flushing pipe 23 extends deep into the dust collection chamber 14, with its outlet facing forward. For the dust discharge port 15, the high-pressure airflow diffuses through the conical nozzle to form a large conical surface air wave, which fully agitates the dust deposited in the dust collection chamber 14, breaks the dust accumulation state and concentrates it to the dust discharge port 15. It is also linked with the dust extraction unit 4. The high-pressure airflow is released after the dust extraction unit 4 is turned on in advance, ensuring that the dust can be discharged in time after being blown up by the air wave, avoiding dust backflow. The capacity of the back-blowing air bag is not less than twice the amount of back-blowing air in one back-blowing operation of the back-blowing valve 22, ensuring a stable supply of high-pressure airflow. The conical nozzle design can expand the dust cleaning range and improve the thoroughness of dust cleaning in the dust collection chamber 14.

[0026] like Figures 1 to 13 As shown, the second-stage interception and filtration unit 3 includes a filter housing 31, a filter element 32, a filter maintenance door 33, and an air filter outlet 34. The bottom of the filter housing 31 is fixedly connected to the top of the pre-filter housing 12. The air filter outlet 34 is fixedly installed on one side of the filter housing 31. The air filter element 32 is fixedly installed inside the filter housing 31 and is placed between the air filter outlet 34 and the filter housing 31. An air filter resistance test interface 35 is provided on the inner wall of the air filter outlet 34. The air filter resistance test interface 35 is used to connect a resistance alarm. The second-stage interception and filtration unit 3 is the core unit of the secondary fine filtration system. It is primarily used for deep purification of the air after coarse filtration by the inertial pre-filter unit 1, filtering out remaining fine particulate dust to provide the engine with clean air intake that meets standards. It is the final barrier ensuring the quality of the engine's intake air. This unit performs secondary filtration of the coarsely filtered air using a high-precision filter element 32, which improves the overall filtration efficiency and effectively intercepts fine particulate dust in the air, preventing it from entering the engine and causing wear on precision components. Simultaneously, it is equipped with a filter element maintenance door 33, facilitating the replacement, cleaning, and maintenance of the filter element 32, reducing the difficulty of later filter maintenance. The air outlet pipe of the filter element housing 31 is equipped with a resistance measuring point and an alarm interface, which can be connected to a resistance alarm. When the intake resistance reaches the engine's preset alarm value, it can promptly remind the operator to replace or maintain the filter element 32, preventing insufficient engine intake due to filter element 32 clogging. The purified clean air is stably delivered to the engine intake system from the air filter outlet 34. The filter element 32 and filter element housing 31 can be arranged separately from the pre-filtration unit and connected by pipelines to achieve distributed installation, adapting to the installation space requirements of different vehicles. In addition, since the dust load of the primary coarse filter is greatly reduced, this unit can achieve a long service life of the filter element 32 and reduce the frequency of maintenance.

[0027] like Figures 1 to 13 As shown, the dust extraction unit 4 includes a dust discharge check valve 41, which is fixedly installed at the bottom of the dust collection chamber 14. A dust pump 42 is connected inside the dust collection chamber 14, and a dust discharge nozzle 43 is provided outside the dust pump 42. The dust extraction unit 4 operates in two modes. The first mode is a dust extraction mode: a dust discharge check valve 41 is installed at the bottom of the dust collection chamber 14 of the pre-filter, followed by a dust extraction pump 42. Before the system issues a backflushing signal, the dust discharge check valve 41 and the dust extraction pump 42 are opened in advance. When backflushing starts, the dust in the dust collection chamber 14 is extracted by the dust extraction pump 42 through the valve and discharged to the outside. The second mode is dust extraction via a duckbill. A dust extraction duckbill 43 is located at the bottom of the dust collection chamber 14 of the pre-filter. During backflushing, the backflushing airflow blows open the duckbill at the bottom of the dust collection chamber 14, discharging the dust collected in the pre-filter to the outside.

[0028] like Figures 14 to 18 As shown, the perforation assembly also includes a perforation plate 7 and two perforation plates 701. Multiple poking rods 702 are fixedly installed on the top of the perforation plate 7 and the two perforation plates 701 respectively. The tops of the perforation plate 7 and the two perforation plates 701 are symmetrically opened in an oblique flow shape. The perforation plate 7 is placed between the two perforation plates 701, and the perforation plate 7 and the two perforation plates 701 are staggered. The outer walls of the perforation plate 7 and the two perforation plates 701 can be slidably connected to the inner wall of the pre-filter inlet 11. A replacement component is provided between the perforation plate 7 and the two poking rods 702. The replacement component is used to drive the perforation plate 7 and the poking rods 702 to alternately poke the airflow holes in the dust-blocking arc plate 6. When the flow measurement component detects a weakening of the airflow passing through the dust-blocking arc plate 6, it drives the replacement component to operate. The replacement component pushes the perforation plate 7 and the two perforation plates 701 to move relative to each other. The perforation plate 7 moves upward, causing the poking rod 702 to poke the airflow holes in the dust-blocking arc plate 6. The two perforation plates 701 then move the poking rod 702 downward and out from the airflow holes on both sides of the dust-blocking arc plate 6, thereby replacing the position of the perforation plate 7 and the two perforation plates 701 to poke the airflow holes on the dust-blocking arc plate 6. It should be noted that the number of airflow holes on the dust-blocking arc plate 6 is the same as the number on the perforation plate 7 and the two perforation plates 701.

[0029] like Figures 17 to 18 As shown, the replacement component includes an electric telescopic rod 9, which is fixedly installed on the outer wall of the pre-filter inlet 11. A replacement plate 904 is fixedly installed at the output end of the electric telescopic rod 9. The outer wall of the replacement plate 904 penetrates the inner wall of the pre-filter inlet 11 and is fixedly connected to the outer wall of the perforated plate 7. A shift plate 902 is symmetrically slidably connected to the outer wall of the pre-filter inlet 11. The outer walls of the two shift plates 902 both penetrate the inner wall of the pre-filter inlet 11 and are fixedly connected to the outer walls of the two perforated plates 701. Gears 903 are symmetrically rotatably connected to the outer wall of the pre-filter inlet 11. A rack 901 is fixedly installed on both sides of the outer wall of the replacement plate 904 and one side of the two shift plates 902. The four racks 901 are respectively placed on both sides of the two gears 903, and the teeth on the four racks 901 can mesh with the teeth on the two gears 903 in pairs. When it is necessary to replace the positions of the first perforated plate 7 and the two second perforated plates 701, the operation is carried out by driving the electric telescopic rod 9. The electric telescopic rod 9 will drive the replacement plate 904 to move upward, thereby causing the first perforated plate 7 to move upward within the pre-filter air inlet 11. When the replacement plate 904 moves, it will drive the rack 901 on one side to move together. The rack 901 will drive the gear 903 to rotate through tooth meshing. The gear 903 will drive the rack 901 on the other side to move relative to it through tooth meshing. The rack 901 will then drive the second perforated plate 701 to move downward within the pre-filter air inlet 11 through the shifting plate 902 and move and open from the dust blocking arc plate 6, thereby completing the position replacement operation between the first perforated plate 7 and the two second perforated plates 701, and playing the role of pushing the first perforated plate 7 and the second perforated plate 701 to move relative to each other.

[0030] like Figures 15 to 16As shown, the flow measurement assembly includes two cavity shafts 804, and pressure sensors 805 are fixedly installed inside each of the two cavity shafts 804. A pressure transmission spring 806 is provided on one side of each of the two pressure sensors 805. The two pressure transmission springs 806 are respectively placed inside the two cavity shafts 804. An arc-shaped push rod 802 is provided inside each of the two cavity shafts 804. The two arc-shaped push rods 802 can respectively fit and contact one side of the two pressure transmission springs 806. A pressure transmission assembly is provided above the two cavity shafts 804. The pressure transmission assembly is used to transmit the air pressure entering from the dust blocking arc plate 6 to the pressure sensors 805 through the arc-shaped push rods 802. When the airflow flows downward through the dust-blocking arc plate 6 in the pre-filter inlet 11, the airflow pushes the pressure transmission component, which in turn drives the arc-shaped push rod 802 to slide and compress within the cavity shaft 804. The arc-shaped push rod 802 then compresses the pressure transmission spring 806 within the cavity shaft 804, causing it to move. When the arc-shaped push rod 802 compresses the pressure transmission spring 806, the pressure sensor 805 continuously senses and detects the compression state of the pressure transmission spring 806. When the pressure sensor 805 detects that the pressure on the pressure transmission spring 806 decreases, it indicates that the airflow entering from the pre-filter inlet 11 will decrease, and the air inlet on the dust-blocking arc plate 6 may become blocked. This allows the sensor to determine whether the air inlet in the dust-blocking arc plate 6 is blocked, thus serving the function of detecting whether the air inlet in the dust-blocking arc plate 6 is blocked.

[0031] like Figures 15 to 16 As shown, the pressure transmission assembly includes two hinge shafts 801, and a cover plate 8 is hinged to the outer wall of each of the two hinge shafts 801. The tops of the two arc-shaped push rods 802 are fixedly connected to the bottoms of the two cover plates 8 respectively. A return spring 803 is provided between the bottom of the two cover plates 8 and the outer wall of the two cavity shafts 804. The two return springs 803 are respectively placed outside the two arc-shaped push rods 802, and one side of the two cover plates 8 can fit into contact with each other. When the airflow flows downward through the dust-blocking arc plate 6 in the pre-filter inlet 11, the airflow will push the two baffles 8 to open relative to each other. The baffles 8 will then rotate on the hinge shaft 801 due to the airflow. The baffles 8 will then push the arc-shaped push rod 802 to squeeze the reset spring 803 to rotate. The arc-shaped push rod 802 will then be pushed by the baffles 8 to squeeze the pressure transmission spring 806 in the cavity shaft 804 to move, thereby performing the squeezing sensing operation on the pressure sensor 805, which will push the arc-shaped push rod 802 to move and squeeze.

[0032] like Figures 14 to 15 As shown, dust extraction valves 501 are symmetrically fixedly installed on the outer wall of the pre-filter air inlet 11, and suction pipes 502 are symmetrically fixedly installed on the outer walls of the two chambers 5. One end of each of the four suction pipes 502 is fixedly connected to the outer wall of the two dust extraction valves 501. When the airflow flows downward through the dust-blocking arc plate 6 in the pre-filter inlet 11, the dust-blocking arc plate 6 will block larger dust and sludge in the airflow. When the dust-blocking arc plate 6 stops blocking the airflow, the filtered dust and sludge will move to both sides of the dust-blocking arc plate 6 along its arc slope, and thus be placed at the sludge outlet 503. At this time, by driving the dust extraction valve 501, the dust extraction valve 501 will draw through the suction pipe 502 into the chamber 5, thereby drawing and collecting the dust and sludge placed at the sludge outlet 503 through the chamber 5, preventing them from being placed in the pre-filter inlet 11 and affecting the subsequent airflow in the pre-filter inlet 11, thus playing the role of dust extraction and sludge collection.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A composite air filter with active dust removal, characterized in that: The system includes a pre-filter housing, with a pre-filter air inlet fixedly installed on one side. Inside the pre-filter housing are an inertial pre-filter unit, a reverse-blowing dust removal unit, a second-stage interception filtration unit, and a dust extraction unit. A dust-blocking arc plate is fixedly installed inside the pre-filter air inlet; the arc plate is an arc-shaped dust baffle. Symmetrical slag outlets are located on the inner wall of the pre-filter air inlet, with two outlets positioned on one side of the dust-blocking arc plate. A perforation assembly is located inside the pre-filter air inlet, positioned below the dust-blocking arc plate. The perforation assembly includes a punch rod, used to clear the airflow holes on the inner wall of the dust-blocking arc plate. A flow measurement assembly is located inside the pre-filter air inlet, positioned below the perforation assembly, used to detect the airflow force flowing through the dust-blocking arc plate.

2. The composite air filter with active dust removal according to claim 1, characterized in that: The inertial pre-filter unit consists of several pre-filter reverse cyclone tubes, a dust collection chamber, a dust discharge port, a pre-filter air collection chamber, and a pre-filter air outlet. The pre-filter reverse cyclone tubes are all fixedly installed inside the pre-filter housing. The dust collection chamber is fixedly installed at the bottom of the pre-filter housing. The dust discharge port is located on the lowest inner wall of the dust collection chamber. The dust extraction unit is located inside the dust discharge port. The reverse cyclone tube can be divided into three parts: cyclone tube module one, cyclone tube module two, and cyclone tube module three. A pre-filter flow rate regulating gate is provided at the inlet of cyclone tube module two. The pre-filter air collection chamber is fixedly installed at the top of the pre-filter housing, and the pre-filter air outlet is located at one end of the pre-filter air collection chamber.

3. The composite air filter with active dust removal according to claim 2, characterized in that: The back-flushing dust removal unit consists of a compressed air tank, a back-flushing valve, a back-flushing pipe, and a back-flushing controller. The compressed air tank and the back-flushing controller are both fixedly installed on the pre-filter housing. One end of the back-flushing pipe is fixedly connected to the inner wall of the back-flushing valve, and the other end of the back-flushing pipe passes through the inner wall of the pre-filter housing and is placed inside the dust collection chamber. The outlet position of the back-flushing pipe corresponds to the position of the dust discharge port. The back-flushing controller is placed on one side of the compressed air tank. A back-flushing nozzle is fixedly installed at the outlet end of the back-flushing pipe. The back-flushing nozzle includes a connecting section. The outlet end of the back-flushing pipe is fixedly connected to the outer wall of the connecting section. A support rod is fixedly installed at the bottom of the connecting section, and a guide cone is fixedly installed inside the support rod.

4. The composite air filter with active dust removal according to claim 3, characterized in that: The second-stage interception and filtration unit consists of a filter housing, a filter element, a filter maintenance door, and an air filter outlet. The bottom of the filter housing is fixedly connected to the top of the pre-filter housing. The air filter outlet is fixedly installed on one side of the filter housing. The air filter element is fixedly installed inside the filter housing and placed between the air filter outlet and the filter housing. An air filter resistance test interface is provided on the inner wall of the air filter outlet.

5. The composite air filter with active dust removal according to claim 4, characterized in that: The dust extraction unit includes a dust discharge check valve, which is fixedly installed at the bottom of the dust collection chamber. A dust pump is connected inside the dust collection chamber, and a dust discharge nozzle is provided on the outside of the dust pump.

6. The composite air filter with active dust removal according to claim 1, characterized in that: The perforation assembly also includes a perforation plate one and two perforation plates two. Multiple poking rods are fixedly installed on the top of the perforation plate one and the two perforation plates two respectively. The tops of the perforation plate one and the two perforation plates two are symmetrically opened in an oblique flow shape. The perforation plate one is placed between the two perforation plates two, and the perforation plate one and the two perforation plates two are staggered. The outer walls of the perforation plate one and the two perforation plates two can be slidably connected to the inner wall of the pre-filter inlet. A replacement component is provided between the perforation plate one and the two poking rods.

7. A composite air filter with active dust removal according to claim 6, characterized in that: The replacement component includes an electric telescopic rod, which is fixedly installed on the outer wall of the pre-filter inlet. A replacement plate is fixedly installed at the output end of the electric telescopic rod. The outer wall of the replacement plate penetrates the inner wall of the pre-filter inlet and is fixedly connected to the outer wall of the first perforated plate. A shift plate is symmetrically slidably connected to the outer wall of the pre-filter inlet. The outer walls of the two shift plates penetrate the inner wall of the pre-filter inlet and are fixedly connected to the outer walls of the two second perforated plates. Gears are symmetrically rotatably connected to the outer wall of the pre-filter inlet. Toothed rods are fixedly installed on both outer walls of the replacement plate and one side of the two shift plates. The four toothed rods are respectively placed on both sides of the two gears, and the teeth on the four toothed rods can mesh with the teeth on the two gears in pairs.

8. The composite air filter with active dust removal according to claim 1, characterized in that: The flow measurement assembly includes two cavity shafts, each with a pressure sensor fixedly installed inside. Each pressure sensor has a pressure transmission spring on one side, and the two pressure transmission springs are respectively placed inside the two cavity shafts. Each cavity shaft also has an arc-shaped push rod inside, which can respectively contact one side of the two pressure transmission springs. A pressure transmission assembly is located above the two cavity shafts.

9. A composite air filter with active dust removal according to claim 8, characterized in that: The pressure transmission assembly includes two hinge shafts, each hinged to a baffle plate on its outer wall. The tops of two arc-shaped push rods are fixedly connected to the bottoms of the two baffle plates respectively. A return spring is provided between the bottom of the two baffle plates and the outer walls of the two cavity shafts. One side of the two baffle plates can fit into contact with each other.

10. A composite air filter with active dust removal according to claim 1, characterized in that: Dust extraction valves are symmetrically fixedly installed on the outer wall of the pre-filter air inlet, and suction pipes are symmetrically fixedly installed on the outer walls of both chambers. One end of each of the four suction pipes is fixedly connected to the outer wall of the two dust extraction valves.

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