Air filter with pretreatment structure for engine

Abstract

The invention provides an air filter with a pretreatment structure for an engine, and relates to the technical field of air filters, the air filter comprises a filter body and a scraping driving pipe, the scraping driving pipe is arranged above the filter body, a sealing pipe is arranged at the bottom of the filter body, a filter assembly is arranged in the filter body, and the scraping driving pipe is arranged above the filter body. The lower end of the filtering assembly extends into the sealing pipe; pre-capturing of large-particle impurities is achieved through the filtering assembly in the filtering body, when the air inlet resistance changes due to dust accumulated on the surface of the filtering net, the controller can trigger a self-cleaning program and drive the scraping plate to be inserted into the inner side of the filtering net to scrape away the accumulated dust, meanwhile, the air suction valve is opened, the scraped dust is rapidly discharged through the dust outlet pipe, and in the whole cleaning process, the cleaning efficiency is greatly improved. The air inlet pipe continuously introduces air, the air outlet pipe normally conveys filtered air to the engine, accumulated dust cleaning can be completed without shutdown, the defect that the work of the engine needs to be interrupted when an existing pre-separator is used for cleaning is effectively overcome, and the continuous operation capacity of equipment is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air filters, in particular to an air filter with pretreatment structure for engine. BACKGROUND

[0002] In the working process of the engine, a large amount of air needs to be continuously sucked in to meet the combustion demand, and if the impurities such as sand and dust contained in the air directly enter the engine combustion chamber, it will cause the wear of key components such as pistons and cylinder walls, and seriously affect the working stability and service life of the engine. Therefore, the engine is equipped with an air filtration system, in which the main air filter is used to capture fine particles to achieve fine filtration. In order to avoid the rapid clogging of the main air filter by large particle impurities and shorten its service life, an engine air pre-separator (also known as a pre-cleaner or a pre-filter) is usually arranged upstream of the main air filter, and the core design purpose is to preferentially capture particle impurities with larger filtration precision than the main air filter, to pre-reduce the content of large particle pollutants in the air, to reduce the filtration load of the main air filter, to prolong the maintenance period and service life of the main air filter, and to ensure the long-term stable operation of the engine air intake system.

[0003] However, the existing engine air pre-separator still has many deficiencies: first, most pre-separators do not have an automatic cleaning function, and the large particles captured on the surface of the filter screen need to be cleaned manually by disassembling or directly replacing the pre-filter component, which requires the engine to be stopped during the cleaning process, seriously affecting the continuous working efficiency of the engine, especially in engineering vehicles, ships and other equipment that need to be continuously operated for a long time, this problem is more prominent; second, the cleaning timing completely depends on manual regular processing, and cannot accurately trigger the cleaning action according to the actual dust accumulation degree of the filter screen, which may cause the air intake resistance to increase due to untimely cleaning, or cause unnecessary maintenance cost waste due to excessive cleaning, therefore, the present application proposes an air filter with pretreatment structure for engine to solve the problems existing in the prior art. SUMMARY

[0004] In view of the above problems, the present application provides an air filter with pretreatment structure for engine, which realizes the pre-capture of large particle impurities through the filter assembly inside the filter body. When the dust accumulation on the filter screen surface causes the air intake resistance to change, the controller can trigger the self-cleaning program to drive the scraper to insert into the inside of the filter screen to remove the dust accumulation, and at the same time, the air suction valve is opened, the scraped dust is quickly discharged through the dust outlet pipe. During the entire cleaning process, the air inlet pipe continuously introduces air, and the air outlet pipe normally delivers the filtered air to the engine, so that the dust accumulation cleaning can be completed without stopping the engine, effectively solving the problem that the existing pre-separator needs to interrupt the engine operation during cleaning, and ensuring the continuous operation ability of the equipment.

[0005] In order to achieve the purpose of the present application, the present application realizes the technical scheme as follows: an air filter with a pretreatment structure for an engine, comprising a filter body and a scraping driving pipe, the scraping driving pipe is arranged above the filter body, the bottom of the filter body is provided with a sealing pipe, the inside of the filter body is provided with a filter assembly, and the lower end of the filter assembly extends to the inside of the sealing pipe, an air outlet is arranged on the filter body at the position of one side of the filter assembly, and the lower end of the sealing pipe is provided with an air inlet pipe;

[0006] an ash discharge pipe is arranged on the side surface of the filter body at the position above the filter assembly, the inside of the scraping driving pipe is provided with a driving assembly, and a scraper is arranged below the driving assembly, and the scraper is used for movably inserting into the inside of the filter assembly.

[0007] Further improvement lies in that the filter body is mounted on a vehicle body panel, and the rear end of the filter body is fixed to the vehicle body panel through bolts.

[0008] Further improvement lies in that the air outlet is connected with a first flange, and the air outlet is connected with an air outlet pipe through the first flange.

[0009] Further improvement lies in that the ash discharge pipe is connected with a suction valve, and the suction valve is connected with a controller.

[0010] Further improvement lies in that the bottom of the sealing pipe is connected with a second flange, and the sealing pipe is connected with the air inlet pipe through the second flange.

[0011] Further improvement lies in that the inside of the air inlet pipe is provided with a first air volume sensor, the inside of the air outlet pipe is provided with a second air volume sensor, the signal output ends of the first air volume sensor and the second air volume sensor are connected to the controller, and the controller controls the opening and closing of the suction valve and the driving assembly according to the air volume difference, and the formula is as follows:

[0012] ,

[0013] When ≥ , the controller outputs an instruction to open the suction valve and start the driving assembly; when < , the controller outputs an instruction to close the suction valve and reset the driving assembly; wherein, is the real-time air flow of the air inlet pipe, and is the real-time detection value of the first air volume sensor; is the real-time air flow of the air outlet pipe, and is the real-time detection value of the second air volume sensor; is the real-time air volume difference of the air inlet pipe and the air outlet pipe, and is the calculation difference between and . The preset airflow threshold is the dust cleaning trigger threshold stored in the controller. Its value is determined based on the filter model, the engine's rated air intake, and the filter's precision calibration.

[0014] A further improvement is that a pressure relief port is provided on the lower side of one side of the filter body, and a pressure relief valve is connected to the pressure relief port.

[0015] A further improvement is that the upper end of the filter body is provided with a third flange, and the filter body is connected to the scraping drive tube through the third flange.

[0016] A further improvement is made in that: the drive assembly includes a sliding rod and a threaded screw. The sliding rod is slidably disposed inside the scraping drive tube, and the scraper is connected to the lower end of the sliding rod. The threaded screw is rotatably disposed inside the scraping drive tube, and the lower end of the threaded screw penetrates into the interior of the sliding rod and is threadedly fitted. A guide strip is provided on the outer side of the sliding rod, and a guide groove adapted to the guide strip is provided on the inner side of the scraping drive tube. A motor is provided at the top of the scraping drive tube, and the output end of the motor is connected to the threaded screw.

[0017] A further improvement is that the filter assembly includes a frame and a filter screen, the filter screen is disposed inside the frame, a sealing ring is provided above the inner side of the filter body, and a side ring adapted to the sealing ring is provided at the top of the frame.

[0018] The beneficial effects of this invention are as follows:

[0019] 1. This invention achieves pre-capture of large particulate impurities through the filter components inside the filter body. When dust accumulation on the filter screen causes changes in air intake resistance, the controller can trigger a self-cleaning program, driving a scraper to insert into the inside of the filter screen to scrape off the accumulated dust. At the same time, the suction valve opens, and the scraped dust is quickly discharged through the dust outlet pipe. Throughout the cleaning process, the air inlet pipe continuously introduces air, and the air outlet pipe normally delivers filtered air to the engine. Dust collection can be completed without stopping the machine, effectively solving the drawback of the existing pre-separator requiring engine interruption during cleaning and ensuring the continuous operation capability of the equipment.

[0020] 2. This invention uses a first airflow sensor inside the inlet duct and a second airflow sensor inside the outlet duct to collect the inlet air flow rate in real time. and airflow The controller calculates the airflow difference based on a preset algorithm and compares it with a pre-stored dust collection trigger threshold. To make a comparison, when ≥ The suction valve and drive assembly are automatically activated when... < The system automatically controls the suction valve to close and the drive components to reset, eliminating the need for manual judgment of dust accumulation. It can precisely trigger cleaning actions based on the actual degree of filter blockage, avoiding the subjectivity and lag of manual maintenance, and significantly improving the ease of use and intelligence of the filter.

[0021] 3. The filter assembly of this invention has a side ring at the top of its frame, which fits tightly with the sealing ring inside the filter body. At the same time, the sealing tube is fixed to the air inlet pipe through the second flange, and the air outlet is fixed to the air outlet pipe through the first flange, forming a multi-seal structure. This effectively avoids air leakage and ensures that all the air to be filtered passes through the filter screen, guaranteeing the pre-treatment accuracy. In addition, the self-pre-treatment cleaning function can promptly remove large particles of dust from the surface of the filter screen, reducing the clogging speed of the filter screen and reducing the fluctuation of air intake resistance. This not only ensures the stability of filtration efficiency but also significantly extends the service life of the filter screen and filter assembly, reduces the frequency of filter component replacement, and lowers equipment maintenance costs and downtime losses. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the installation of the present invention;

[0023] Figure 2 This is the front view of the present invention;

[0024] Figure 3 This is a schematic diagram of the internal structure of the filter body of the present invention;

[0025] Figure 4 This is a schematic diagram of the internal structure of the scraping drive tube of the present invention.

[0026] The components are as follows: 1. Filter body; 2. Scraper drive pipe; 3. Sealing pipe; 4. Air outlet; 5. Air inlet pipe; 6. Ash outlet pipe; 7. Scraper; 8. Body panel; 9. First flange; 10. Air outlet pipe; 11. Suction valve; 12. Second flange; 13. Pressure relief port; 14. Third flange; 15. Sliding rod; 16. Threaded screw; 17. Guide bar; 18. Motor; 19. Frame; 20. Filter screen; 21. Sealing ring; 22. Side ring; 23. Controller. Detailed Implementation

[0027] To enhance understanding of the present invention, the present invention will be further described in detail below with reference to embodiments. These embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0028] Example 1

[0029] according to Figure 1 , 2As shown in Figures 3 and 4, this embodiment proposes an air filter for an engine with a pretreatment structure, including a filter body 1 and a scraping drive tube 2. The scraping drive tube 2 is located above the filter body 1. A sealing tube 3 is provided at the bottom of the filter body 1. A filter assembly is provided inside the filter body 1, and the lower end of the filter assembly extends into the interior of the sealing tube 3. An air outlet 4 is provided on the filter body 1 at one side of the filter assembly, and an air inlet 5 is provided at the lower end of the sealing tube 3.

[0030] A dust outlet pipe 6 is provided on the side of the filter body 1 at the upper position of the filter assembly. A drive assembly is provided inside the scraper drive pipe 2, and a scraper 7 is provided below the drive assembly. The scraper 7 is used to be movably inserted into the interior of the filter assembly. When the engine is running, the air to be filtered enters the sealing pipe 3 from the air inlet pipe 5, and flows through the filter assembly after being guided by the sealing pipe 3. The filter screen 20 in the filter assembly traps large particulate impurities in the air, realizing pretreatment. The pretreated air is output to the engine through the air outlet 4, while the trapped dust adheres to the surface of the filter screen 20, providing a treatment object for subsequent cleaning. The drive assembly in the scraper drive pipe 2 can drive the scraper 7 to accurately insert into the interior of the filter assembly, providing a basis for dust removal.

[0031] The filter element 1 is installed on the vehicle body panel 8, and the rear end of the filter element 1 is fixed to the vehicle body panel 8 by bolts. By fixing the filter element 1 to the vehicle body panel 8 with bolts, the rigid support of the vehicle body panel 8 is used to ensure that the relative position of the filter element 1 and the vehicle body is fixed, avoiding displacement of the filter element 1 and loosening of component connections caused by vibration generated during engine operation. This ensures the working stability of the air intake channel and cleaning mechanism, and prevents vibration from affecting the filtration and cleaning effect.

[0032] The air outlet 4 is connected to a first flange 9, and the air outlet 4 is connected to the air outlet pipe 10 through the first flange 9. The first flange 9 enables a detachable and fixed connection between the air outlet 4 and the air outlet pipe 10. On the one hand, the tight fit of the flange surface ensures the sealing of the connection, preventing leakage of pre-treated clean air and ensuring that all clean air is delivered to the engine; on the other hand, the flange connection structure facilitates quick disassembly and assembly of the air outlet pipe 10 during later maintenance, improving maintenance convenience.

[0033] A suction valve 11 is connected to the ash discharge pipe 6, and a controller 23 is connected to the suction valve 11. The suction valve 11 is normally closed to ensure that a sealed filter chamber is formed inside the filter body 1, preventing air leakage from the ash discharge pipe 6. When the controller 23 issues a cleaning command, the suction valve 11 opens simultaneously, creating a negative pressure channel between the inside of the filter body 1 and the outside. The scraped ash is quickly discharged through the ash discharge pipe 6 under the action of negative pressure, preventing ash residue.

[0034] The bottom of the sealing pipe 3 is connected to a second flange 12, and the sealing pipe 3 is connected to the air inlet pipe 5 through the second flange 12. The second flange 12 achieves a rigid connection between the sealing pipe 3 and the air inlet pipe 5. The tightness of the flange connection ensures the airtightness of the air inlet channel, prevents unfiltered air from leaking from the connection gap, and ensures that all incoming air must flow through the filter assembly for pretreatment, avoiding unfiltered air from directly entering the engine and causing component wear.

[0035] A first airflow sensor is provided on the inner side of the air inlet duct 5, and a second airflow sensor is provided on the inner side of the air outlet duct 10. The signal output terminals of the first and second airflow sensors are connected to the controller 23, and the controller 23 controls the opening and closing of the suction valve 11 and the drive assembly according to the airflow difference, as shown in the following formula:

[0036] ,

[0037] when ≥ When, controller 23 outputs a command to open suction valve 11 and start drive components; when < At that time, the controller 23 outputs a command to close the suction valve 11 and reset the drive assembly; wherein, , where is the real-time airflow of the air inlet duct 5, and is the real-time detection value of the first airflow sensor; The real-time airflow rate of the air outlet duct 10 is denoted as , and the real-time detection value of the second airflow sensor is denoted as . The real-time airflow difference between inlet duct 5 and outlet duct 10 is... and Calculate the difference; The preset airflow threshold is the dust cleaning trigger threshold pre-stored in controller 23, and its value is determined based on the filter model, the engine's rated intake air volume, and the filter screen 20's precision calibration. The first airflow sensor collects the airflow from the intake duct 5 in real time. The second airflow sensor collects the airflow rate of the outlet duct 10 in real time. The signal is then transmitted to controller 23; controller 23 calculates the airflow difference using a preset algorithm. When dust accumulates on filter 20, causing increased air intake resistance, Decrease Increase, when Reaching the preset threshold When the cleaning process is complete, the controller 23 automatically triggers the cleaning program, controls the suction valve 11 to open, and starts the drive components; once cleaning is complete, the permeability of the filter 20 is restored. Increase Less than The controller 23 controls the suction valve 11 to close and the drive component to reset, thereby achieving precise automatic control of the cleaning timing.

[0038] A pressure relief port 13 is provided on the lower side of one side of the filter body 1, and a pressure relief valve is connected to the pressure relief port 13. When the filter screen 20 suddenly becomes severely clogged or the intake system experiences abnormal pressure, the internal pressure of the filter body 1 will rise sharply. When the pressure exceeds the preset threshold of the pressure relief valve, the pressure relief valve will automatically open and release the excessive pressure in the cavity through the pressure relief port 13, so as to avoid damage to components such as the filter body 1 and the sealing pipe 3 due to excessive pressure, and at the same time prevent the engine intake system from being damaged due to abnormal pressure, thus ensuring the safe operation of the equipment.

[0039] The upper end of the filter body 1 is provided with a third flange 14, and the filter body 1 is connected to the scraper drive tube 2 through the third flange 14. The third flange 14 realizes the fixed connection between the filter body 1 and the scraper drive tube 2. On the one hand, it ensures the precise relative position of the two, so that when the drive component drives the scraper 7, it can accurately insert into the filter component, ensuring the effectiveness of the ash scraping action; on the other hand, the sealing of the flange connection can prevent air from leaking from the connection point in the filter body 1, avoiding affecting the air intake efficiency and the formation of negative pressure during cleaning.

[0040] The drive assembly includes a sliding rod 15 and a threaded screw 16. The sliding rod 15 is slidably disposed inside the scraping drive tube 2. The scraper 7 is connected to the lower end of the sliding rod 15. The threaded screw 16 is rotatably disposed inside the scraping drive tube 2, and the lower end of the threaded screw 16 penetrates into the interior of the sliding rod 15 and is threadedly adapted. A guide strip 17 is provided on the outer side of the sliding rod 15. A guide groove adapted to the guide strip 17 is provided on the inner side of the scraping drive tube 2. A motor 18 is provided at the top of the scraping drive tube 2, and the output end of the motor 18 is connected to the threaded screw 16. When the controller 23 issues a cleaning command, the motor 18 starts and drives the threaded screw 16 to rotate. Since the threaded screw 16 and the sliding rod 15 are threadedly matched, and the sliding rod 15 is restricted to circumferential rotation through the guide bar 17 and the guide groove of the scraper drive tube 2, the rotational motion of the threaded screw 16 is converted into the axial linear motion of the sliding rod 15, which drives the scraper 7 to insert downward into the inner side of the filter screen 20 of the filter assembly, scraping off the attached dust. At the same time, the suction valve 11 opens, and the scraped dust is quickly discharged through the dust outlet pipe 6. During the entire cleaning process, the air inlet pipe 5 continuously introduces air, and the air outlet pipe 10 normally delivers filtered air to the engine, so the dust cleaning can be completed without stopping the machine. After the cleaning is completed, the motor 18 reverses, drives the threaded screw 16 to rotate in the opposite direction, and the sliding rod 15 drives the scraper 7 to return to its original position, completing one cleaning cycle. The scraper 7 has perforations, which do not affect normal ventilation.

[0041] Example 2

[0042] according to Figure 1 , 2As shown in Figures 3 and 4, this embodiment proposes an air filter for an engine with a pretreatment structure, including a filter body 1 and a scraping drive tube 2. The scraping drive tube 2 is located above the filter body 1. A sealing tube 3 is provided at the bottom of the filter body 1. A filter assembly is provided inside the filter body 1, and the lower end of the filter assembly extends into the interior of the sealing tube 3. An air outlet 4 is provided on the filter body 1 at one side of the filter assembly, and an air inlet 5 is provided at the lower end of the sealing tube 3.

[0043] A dust outlet pipe 6 is provided on the side of the filter body 1 at the upper position of the filter assembly. A drive assembly is provided inside the scraper drive pipe 2, and a scraper 7 is provided below the drive assembly. The scraper 7 is used to be movably inserted into the interior of the filter assembly. When the engine is running, the air to be filtered enters the sealing pipe 3 from the air inlet pipe 5, and flows through the filter assembly after being guided by the sealing pipe 3. The filter screen 20 in the filter assembly traps large particulate impurities in the air, realizing pretreatment. The pretreated air is output to the engine through the air outlet 4, while the trapped dust adheres to the surface of the filter screen 20, providing a treatment object for subsequent cleaning. The drive assembly in the scraper drive pipe 2 can drive the scraper 7 to accurately insert into the interior of the filter assembly, providing a basis for dust removal.

[0044] The filter element 1 is installed on the vehicle body panel 8, and the rear end of the filter element 1 is fixed to the vehicle body panel 8 by bolts. By fixing the filter element 1 to the vehicle body panel 8 with bolts, the rigid support of the vehicle body panel 8 is used to ensure that the relative position of the filter element 1 and the vehicle body is fixed, avoiding displacement of the filter element 1 and loosening of component connections caused by vibration generated during engine operation. This ensures the working stability of the air intake channel and cleaning mechanism, and prevents vibration from affecting the filtration and cleaning effect.

[0045] The filter assembly includes a frame 19 and a filter screen 20. The filter screen 20 is located inside the frame 19. A sealing ring 21 is provided on the upper part of the inner side of the filter body 1. A side ring 22 adapted to the sealing ring 21 is provided on the top of the frame 19. The frame 19 provides rigid support for the filter screen 20, ensuring that the filter screen 20 maintains structural stability under the impact of airflow and the scraping action of the scraper 7. The filter screen 20 uses a filter material with appropriate precision, which is specially designed to trap large particulate impurities in the air, realizing a pre-treatment function. The side ring 22 on the top of the frame 19 fits tightly with the sealing ring 21 on the inner side of the filter body 1 to form a sealing structure, preventing unfiltered air from bypassing through the gap between the filter screen 20 and the filter body 1, ensuring that all incoming air is filtered by the filter screen 20, and guaranteeing the pre-treatment precision.

[0046] This engine air filter with a pre-treatment structure achieves pre-capture of large particles of impurities through the filter components inside the filter body 1. When dust accumulates on the surface of the filter screen 20, causing changes in intake resistance, the controller 23 can trigger a self-cleaning program, driving the scraper 7 to insert into the inside of the filter screen 20 to scrape off the accumulated dust. At the same time, the suction valve 11 opens, and the scraped dust is quickly discharged through the dust outlet pipe 6. Throughout the cleaning process, the air inlet pipe 5 continuously introduces air, and the air outlet pipe 10 normally delivers filtered air to the engine. Dust collection can be completed without stopping the machine, effectively solving the drawback of existing pre-separators that require interrupting engine operation during cleaning, and ensuring the continuous operation capability of the equipment. Furthermore, the intake airflow is collected in real time through the first airflow sensor in the air inlet pipe 5 and the second airflow sensor in the air outlet pipe 10. and airflow The controller 23 calculates the airflow difference according to a preset algorithm and compares it with the pre-stored dust cleaning trigger threshold ΔQ0. When ≥ The suction valve 11 and drive assembly are automatically activated when... < The automatic control system closes the suction valve 11 and resets the drive assembly, eliminating the need for manual judgment of dust accumulation. It precisely triggers cleaning actions based on the actual degree of clogging of the filter screen 20, avoiding the subjectivity and lag of manual maintenance and significantly improving the ease of use and intelligence of the filter. Simultaneously, the top of the filter assembly frame 19 has a side ring 22 that fits tightly against the sealing ring 21 inside the filter body 1. The sealing pipe 3 is fixed to the inlet pipe 5 via the second flange 12, and the outlet 4 is fixed to the outlet pipe 10 via the first flange 9, forming a multi-layered sealing structure that effectively prevents air leakage. This ensures that all air to be filtered passes through the filter screen 20, guaranteeing pre-treatment accuracy. Furthermore, the self-pre-treatment cleaning function promptly removes large particles of dust from the surface of the filter screen 20, reducing the clogging rate and fluctuations in intake resistance. This not only ensures the stability of filtration efficiency but also significantly extends the service life of the filter screen 20 and the filter assembly, reducing the frequency of filter component replacement and lowering equipment maintenance costs and downtime losses.

[0047] 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. An air filter for an engine with a pretreatment structure, comprising a filter element (1) and a scraping drive pipe (2), characterized in that: The scraping drive tube (2) is located above the filter body (1). The bottom of the filter body (1) is provided with a sealing tube (3). The filter body (1) is provided with a filter assembly inside, and the lower end of the filter assembly extends into the interior of the sealing tube (3). The filter body (1) at one side of the filter assembly is provided with an air outlet (4). The lower end of the sealing tube (3) is provided with an air inlet pipe (5). The filter body (1) located above the filter assembly has an ash outlet pipe (6) on its side. The scraping drive pipe (2) has a drive assembly inside, and a scraper (7) is provided below the drive assembly. The scraper (7) is used to be movably inserted into the interior of the filter assembly.

2. An engine air filter with a pretreatment structure according to claim 1, characterized in that: The filter (1) is installed on the body panel (8), and the rear end of the filter (1) is fixed to the body panel (8) by bolts.

3. An engine air filter with a pretreatment structure according to claim 1, characterized in that: The air outlet (4) is connected to a first flange (9), and the air outlet (4) is connected to an air outlet pipe (10) through the first flange (9).

4. An engine air filter with a pretreatment structure according to claim 3, characterized in that: The ash discharge pipe (6) is connected to a suction valve (11), and the suction valve (11) is connected to a controller (23).

5. An engine air filter with a pretreatment structure according to claim 4, characterized in that: The bottom of the sealing pipe (3) is connected to a second flange (12), and the sealing pipe (3) is connected to the air inlet pipe (5) through the second flange (12).

6. An engine air filter with a pretreatment structure according to claim 5, characterized in that: The inner side of the air inlet pipe (5) is provided with a first air volume sensor, and the inner side of the air outlet pipe (10) is provided with a second air volume sensor. The signal output terminals of the first air volume sensor and the second air volume sensor are connected to the controller (23), and the controller (23) controls the opening and closing of the suction valve (11) and the drive assembly according to the air volume difference, as shown in the following formula: ， when ≥ When the controller (23) outputs a command to open the suction valve (11) and start the drive assembly; when < At that time, the controller (23) outputs a command to close the suction valve (11) and reset the drive assembly; wherein, The real-time airflow of the air inlet duct (5) is the real-time detection value of the first airflow sensor; The real-time airflow of the air outlet duct (10) is denoted as , and the real-time detection value of the second airflow sensor is denoted as . The real-time airflow difference between the inlet duct (5) and the outlet duct (10) is... and Calculate the difference; The preset air volume threshold is the dust cleaning trigger threshold stored in the controller (23), and its value is determined according to the filter model, the rated air intake of the engine and the accuracy calibration of the filter screen (20).

7. An engine air filter with a pretreatment structure according to claim 1, characterized in that: The filter body (1) has a pressure relief port (13) on one side below, and a pressure relief valve is connected to the pressure relief port (13).

8. An engine air filter with a pretreatment structure according to claim 1, characterized in that: The filter body (1) is provided with a third flange (14) at its upper end, and the filter body (1) is connected to the scraping drive tube (2) through the third flange (14).

9. An engine air filter with a pretreatment structure according to claim 8, characterized in that: The drive assembly includes a sliding rod (15) and a threaded screw (16). The sliding rod (15) is slidably disposed inside the scraping drive tube (2). The scraper (7) is connected to the lower end of the sliding rod (15). The threaded screw (16) is rotatably disposed inside the scraping drive tube (2), and the lower end of the threaded screw (16) penetrates into the interior of the sliding rod (15) and is threadedly fitted. A guide strip (17) is provided on the outer side of the sliding rod (15). A guide groove that matches the guide strip (17) is provided on the inner side of the scraping drive tube (2). A motor (18) is provided at the top of the scraping drive tube (2), and the output end of the motor (18) is connected to the threaded screw (16).

10. An engine air filter with a pretreatment structure according to claim 1, characterized in that: The filter assembly includes a frame (19) and a filter screen (20). The filter screen (20) is located inside the frame (19). A sealing ring (21) is provided above the inner side of the filter body (1). A side ring (22) that matches the sealing ring (21) is provided on the top of the frame (19).

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