An on-line self-pulsing self-cleaning air filter and its control method

Abstract

The application discloses a kind of not stopping self-pulse self-cleaning air filter and its control method, including shell, barrel filter element, rotating pipe, ventilation branch pipe, strip nozzle, pulse air pipe;The application makes the impulse of pulse airflow make strip nozzle pulsate step-by-step self-rotation in barrel filter element, and carries out pulse backwash to filter element by compressed air to filter element by strip nozzle, since filter element only has about 1 / 30 strip part to carry out pulse backwash, so that 1000-4000KW engine can be realized when filter element backwash does not affect the normal operation of vehicle;The application is rotated by airflow to realize filter element, greatly reduces additional energy consumption, and automatically maintains engine operation under low pressure difference of intake, saves oil by 2-3%.

Description

Technical Field

[0001] This invention belongs to the field of air filter technology, and particularly relates to a non-stop self-pulse self-cleaning air filter and its control method. Background Technology

[0002] Most existing mobile equipment, such as armored vehicles, wide-body vehicles, and mining machinery, are powered by diesel engines. Diesel engines consume a certain amount of clean air during operation, so they must be equipped with air filters, typically cylindrical filter elements. Since the dust content in the air varies by hundreds of times in different locations, and any filter element has a fixed dust holding capacity, armored vehicles and wide-body vehicles are generally equipped with combined air filters consisting of a cyclone pre-filter and a barrier filter element to extend the service life of the intake filter element as much as possible, in order to adapt to working environments with very poor air quality. The most advanced representative product in the world is probably the PDS vehicle-mounted air filter from Donaldson, USA. The PDS YKZ desert air filter, designed and manufactured based on the working principle of PDS, is installed on a wide-body vehicle. Not only is it large and heavy, but the instruction manual also clearly states that the filter element should be removed and manually blown out with compressed air every 50-100 hours when there is no sandstorm. This is clearly unsuitable for the special requirements of tanks and other armored vehicles and special vehicles in desert areas where the filter element is not replaced or cleaned for extended periods.

[0003] Gas turbines are also a type of internal combustion engine, but they have even higher requirements for air purification: they use air as the working fluid, consuming 2 to 3 times the air per horsepower of a diesel engine, with a filtration accuracy of F7 to F9 (diesel engines are generally M5-EN779), and an intake pressure drop of 1 / 3 to 1 / 4 that of diesel engines (<1300Pa). They also require continuous operation for thousands of hours without shutdown or filter replacement, which has spurred the development of self-cleaning air filters. Currently available self-cleaning air filters require an electric motor to drive the filter element to rotate slowly according to a set program. The motor power is 250W. This not only results in a complex structure, but the filter element is also sealed using a "magnetic fluid seal." This seal aims to ensure reliable sealing while minimizing frictional resistance during rotation, leading to high production costs. Furthermore, the application of "magnetic fluid seal" technology is relatively limited. Therefore, this technology has not been adopted by Western tanks such as the Leopard and Challenger, nor has Donaldson applied it to civilian wide-body vehicles.

[0004] Our company has also invented a vehicle-mounted pulse self-cleaning air filter (patent number CN2012203849469) and a pulse self-cleaning plate-type vehicle-mounted air filter (patent number CN201720380165.5). Although the cost has been greatly reduced, its structure is still relatively complex, so the production cost is still relatively high, and it is not suitable for use in high-power military vehicles and wide-body vehicles with engine power between 1,000 and 4,000 horsepower. Summary of the Invention

[0005] To address the shortcomings of the existing technology, the present invention provides a self-rotating, self-flushing, energy-saving, non-stop self-pulse self-cleaning air filter and its control method.

[0006] To solve the above problems, the technical solution adopted by the present invention is as follows: A non-stop, self-pulsating, self-cleaning air filter includes a housing, a cylindrical filter element, a rotating pipe, an air vent branch pipe, strip nozzles, and a pulse airflow duct. Multiple cylindrical filter elements are installed inside the housing. Air inlets are located around the top perimeter of the housing. Each cylindrical filter element has an air outlet at its lower end. A rotating pipe is rotatably installed at the center of each cylindrical filter element. The two sides of the rotating pipe are connected to the strip nozzles via air vent branch pipes. The strip nozzles are elongated and distributed inside the cylindrical filter elements. Multiple exhaust holes of different diameters are evenly distributed on the outer side of each strip nozzle from top to bottom, with the exhaust holes facing the cylindrical filter elements. Air jet holes are provided on the strip nozzles on both sides of the rotating pipe. The kinetic energy of the air jets from the two strip nozzles drives the rotating pipe and strip nozzles to rotate by an angle. A pulse airflow duct is installed at the bottom of the housing and is connected to the lower ends of the multiple rotating pipes.

[0007] Furthermore, the strip nozzles on both sides of the rotating pipe are symmetrically arranged with the rotating pipe and have the same size and weight. Air jet holes are opened on the upper and lower ends of the strip nozzles, and the openings of the air jet holes and the openings of the exhaust holes form a 90° angle. The opening directions of the air jet holes of the strip nozzles on both sides of the rotating pipe are staggered.

[0008] Furthermore, it also includes a pulse control component; the pulse control component includes an accumulator, a pressure reducing valve, a pulse valve, a differential pressure sensor, and a controller; the accumulator and the controller are both installed outside the housing, and the accumulator inputs compressed air into the pulse airflow duct through the pressure reducing valve and the pulse valve; a differential pressure sensor is installed at the air outlet; the differential pressure sensor and the pulse valve are both connected to the controller.

[0009] Furthermore, a dust discharge port is provided on one side of the lower end of the housing; a dust exhaust fan is provided at the dust discharge port; the dust exhaust fan is connected to the controller.

[0010] Furthermore, multiple inner liner supports are installed inside the casing, and a cylindrical filter element is sleeved on the outside of each inner liner support; a one-way rotating bearing and a rotary joint are respectively provided at the top and bottom of the inner liner support; the pulse airflow duct is connected to the lower end of the rotating pipe through the rotary joint; the upper end of the rotating pipe is rotatably connected to the one-way rotating bearing.

[0011] Furthermore, the multiple cylindrical filter elements inside the housing are separated by partitions.

[0012] A control method for a non-stop self-pulse self-cleaning air filter includes the following steps: When the cartridge filter element is very dirty and the differential pressure sensor detects that the inlet differential pressure has reached a certain set value, the controller detects the signal from the differential pressure sensor and outputs a pulse signal to the pulse valve to achieve multi-channel electrical pulse output. High-pressure air introduced from the accumulator passes sequentially through the pressure reducing valve, pulse valve, pulse airflow duct, rotating pipe, ventilation branch pipe, and strip nozzle. The high-pressure airflow performs a strong pulse backwash on a local area of ​​the cartridge filter element through the exhaust port of the strip nozzle. At the same time, the jet holes on the strip nozzles on both sides of the rotating pipe also spray high-pressure airflow. The jet holes on the two strip nozzles drive the rotating pipe and strip nozzles to rotate by an angle through the kinetic energy of the airflow. Thus, when the pulse valve delivers airflow each time, the rotating pipe, ventilation branch pipe, and strip nozzle rotate synchronously once, and the exhaust port performs a strong pulse backwash on a local area of ​​the cartridge filter element. When the number of pulses output by the controller reaches the predetermined set value, the cleaning is completed, and the controller stops driving the pulse valve.

[0013] Furthermore, when the controller outputs a pulse to the pulse valve, it simultaneously outputs an electrical signal to the dust exhaust fan. The dust exhaust fan rotates and sucks up the dust, causing the dust blown out of the cylindrical filter element to be discharged through the dust discharge port. When the pulse output stops, the backwashing of the cylindrical filter element stops, the electrical signal output by the controller to the dust exhaust fan also stops, and the dust exhaust fan stops running.

[0014] Furthermore, the backflush area of ​​the strip nozzle is less than 1 / 30 of the entire annular area of ​​the filter element.

[0015] Furthermore, the controller can be started in three modes: manual, automatic, and remote control. All three modes have a starting function, and the user can choose any one of them. The automatic signal comes from the differential pressure sensor, and the remote control signal comes from the remote control paired with the remote control module.

[0016] Furthermore, the pulse signal is a multi-channel electrical pulse with a pulse width T1 of 50–120 ms and a pulse interval T2 of 10–15 s; the rotation angle of the strip nozzle is determined by the diameter Φ of the jet hole opened on the strip nozzle. X The pulse width T1 is determined.

[0017] The beneficial effects of this invention are as follows: 1. This invention uses the impulse of pulsed airflow to cause the strip nozzles to rotate pulsatingly within the cylindrical filter element. Compressed air is then used to perform pulsed backwashing on the filter element through the strip nozzles. Since only about 1 / 30 of the strip portion of the filter element is pulsed backwashed, the backwashing process does not affect the normal operation of the vehicle. This allows for 1000-4000KW engines to operate normally without disruption during filter backwashing, resulting in fuel savings of 2-3%. The invention utilizes the kinetic energy of the airflow to drive the rotation, significantly reducing additional energy consumption. While the cylindrical filter element itself remains stationary, the central rotating pipe within each element is rotatable. The rotation of this pipe is achieved by the airflow from the strip nozzles on both sides. Air jet holes are located on the upper and lower sides of the strip nozzles on both sides of the rotating pipe, forming a 90° angle with the exhaust port. The air jet directions of the strip nozzles on both sides of the rotating pipe are staggered. This airflow from the jet holes drives the strip nozzles and the rotating pipe to rotate, resulting in a clever structural design.

[0018] 2. This invention achieves the step-by-step self-rotation of the filter element through the jet vector of pulsed airflow, which not only greatly simplifies the structure of the device and reduces its size and weight, but also significantly increases its reliability and reduces additional energy consumption. The cylindrical filter element of this invention is stationary and self-sealing, avoiding the risks to the engine caused by seal failure and improving the filtration accuracy of the filter element. , It can extend the overhaul period of equipment; this invention can realize the continuous operation of gas-using equipment, which not only reduces the labor intensity of drivers and improves manual efficiency, but also improves the utilization rate of equipment and increases economic benefits; in particular, the automatic continuous operation filter element self-cleaning keeps the engine intake pressure difference at a very low level, which reduces the intake pressure difference by 1 to 2 kPa compared with ordinary filters, and can increase engine efficiency by 2 to 3%, with a very significant fuel-saving effect. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention.

[0020] Figure 2 This is a top-view enlarged structural diagram of the cylindrical filter element, rotating pipe, air supply branch pipe, and strip nozzle of the present invention. Detailed Implementation

[0021] The invention will now be described in further detail with reference to the accompanying drawings.

[0022] like Figures 1 to 2As shown, a non-stop self-pulse self-cleaning air filter includes a housing 1, a cylindrical filter element 2, a rotating pipe 3, an air supply branch pipe 4, a strip nozzle 5, and a pulse airflow duct 6. Multiple cylindrical filter elements 2 are installed inside the housing 1. Air inlets 11 are provided around the upper perimeter of the housing 1, and rain caps 12 can be installed on the upper side of the air inlets 11. Each cylindrical filter element 2 has an air outlet 21 at its lower end, so that airflow enters through the air inlet 11, is filtered by the cylindrical filter element 2, and exits through the air outlet 21. A rotating pipe 3 is rotatably installed at the center of each cylindrical filter element 2. Airflow is passed through the two sides of the rotating pipe 3 via... The air branch pipe 4 is connected to the strip nozzle 5; the strip nozzle 5 has a long strip structure and is distributed on the inner side of the cylindrical filter element 2; multiple exhaust holes 51 with different diameters are evenly opened from top to bottom on the outer side of the strip nozzle 5, the multiple exhaust holes 51 are directly facing the cylindrical filter element 2, and the diameters of the multiple exhaust holes 51 are different to ensure uniform exhaust volume; air jet holes 52 are opened on the strip nozzles 5 on both sides of the rotating pipe 3, and the air jet holes 52 on the two strip nozzles 5 drive the rotating pipe 3 and the strip nozzles 5 to rotate by the kinetic energy of the air jet; a pulse airflow duct 6 is installed at the bottom of the housing 1; the pulse airflow duct 6 is connected to the lower end of the multiple rotating pipes 3.

[0023] like Figures 1 to 2 As shown, to facilitate airflow injection to drive the two strip nozzles 5 and the rotating pipe 3 to rotate synchronously, the strip nozzles 5 on both sides of the rotating pipe 3 are arranged symmetrically with the rotating pipe 3, and have the same size and weight. Air jet holes 52 are respectively opened on the upper and lower ends of the strip nozzles 5, and the air jet holes 52 form a 90° angle with the exhaust holes 51. The opening directions of the air jet holes 52 of the strip nozzles 5 on both sides of the rotating pipe 3 are staggered, as shown... Figure 2 As shown, the jet nozzle 52 on the left side sprays air downwards, while the jet nozzle 52 on the right side sprays air upwards. This causes the two jet nozzles 5 and the rotating pipe 3 to rotate clockwise synchronously, thus converting the jet kinetic energy of the airflow into the mechanical energy of the rotation of the two jet nozzles 5 and the rotating pipe 3, achieving self-rotation drive.

[0024] like Figures 1 to 2 As shown, to facilitate pulse control of the airflow in the pulse airflow duct 6, a pulse control component 7 is further included. The pulse control component 7 includes an accumulator 71, a pressure reducing valve 72, a pulse valve 73, a differential pressure sensor 74, and a controller 75. The accumulator 71 and the controller 75 are both installed outside the housing 1. The accumulator 71 inputs compressed air into the pulse airflow duct 6 through the pressure reducing valve 72 and the pulse valve 73. The differential pressure sensor 74 is installed at the air outlet 21. The differential pressure sensor 74 and the pulse valve 73 are both connected to the controller 75.

[0025] like Figures 1 to 2 As shown, in order to discharge the dust blown down by the cartridge filter element 2, a dust discharge port 13 is provided on one side of the lower end of the housing 1; a dust discharge fan 14 is provided at the dust discharge port 13; and the dust discharge fan 14 is connected to the controller 75.

[0026] like Figures 1 to 2 As shown, for ease of assembly, a plurality of inner liner supports 8 are installed inside the housing 1, and a cylindrical filter element 2 is sleeved on the outside of each inner liner support 8; a one-way rotating bearing 81 and a rotary joint 82 are respectively provided at the top and bottom of the inner liner support 8; the pulse airflow duct 6 is connected to the lower end of the rotating pipe 3 through the rotary joint 82; the upper end of the rotating pipe 3 is rotatably connected to the one-way rotating bearing 81.

[0027] like Figures 1 to 2 As shown, in order to facilitate the separation of multiple cylindrical filter elements 2 and provide independent, sealed, and non-interfering filtration and backflushing zones, the multiple cylindrical filter elements 2 inside the housing 1 are further separated by partitions 9.

[0028] like Figures 1 to 2 As shown, a control method for a non-stop self-pulse self-cleaning air filter is described, comprising the following steps: When the cartridge filter element 2 is very dirty and the differential pressure sensor 74 detects that the intake differential pressure has reached a certain set value, the controller 75 detects the signal from the differential pressure sensor 74 and outputs a pulse signal to the pulse valve 73, realizing a multi-channel electrical pulse with a pulse width T1 (50-120ms) and a pulse interval T2 (10-15s). If the vehicle has no air source, a small DC 24V / 50L / 0.5Mpa air compressor can be added separately, with the air introduced from the accumulator 71. High-pressure air passes sequentially through pressure reducing valve 72, pulse valve 73, pulse airflow duct 6, rotating pipe 3, ventilation branch pipe 4, and strip nozzle 5. The high-pressure airflow then performs a strong pulse backwash on a localized area of ​​the cylindrical filter element 2 through the exhaust port 51 of the strip nozzle 5. Simultaneously, high-pressure airflow is ejected from the jet holes 52 on both sides of the rotating pipe 3. The kinetic energy of the ejected airflow from the jet holes 52 on the two strip nozzles 5 drives the rotating pipe 3 and the strip nozzle 5 to rotate by an angle. The rotation angle of the strip nozzle 5 is determined by the diameter Φ of the jet holes 52 on the strip nozzle 5. X The pulse width T1 is determined so that when the pulse valve 73 delivers airflow each time, the rotating pipe 3, the ventilation branch pipe 4, and the strip nozzle 5 rotate synchronously once. At the same time, the exhaust port 51 performs a strong pulse backwash on the local part of the cartridge filter element 2. When the number of pulses output by the controller 75 reaches the predetermined set value, the cleaning is completed, and the controller 75 stops driving the pulse valve 73.

[0029] like Figures 1 to 2As shown, in order to discharge the back-blown dust, the controller 75 outputs a pulse to the pulse valve 73 and simultaneously outputs an electrical signal to the dust exhaust fan 14. The dust exhaust fan 14 rotates and sucks up the dust, so that the dust blown out of the cylindrical filter element 2 is discharged through the dust discharge port 13. When the pulse output stops, the back-washing of the cylindrical filter element 2 stops, the electrical signal output by the controller 75 to the dust exhaust fan 14 also stops, and the dust exhaust fan 14 stops running.

[0030] like Figures 1 to 2 As shown, in order to avoid affecting normal filtration operations during backflushing, the backflushing area of ​​the strip nozzle 5 is further less than 1 / 30 of the entire annular area of ​​the filter element.

[0031] like Figures 1 to 2 As shown, for ease of control, the controller 75 can be started in three modes: manual, automatic, and remote control. All three modes have a starting function, and the user can choose any one of them. The automatic signal comes from the differential pressure sensor, and the remote control signal comes from the remote controller paired with the remote control module.

[0032] This invention uses the impulse of pulsed airflow to cause the strip nozzles 5 to rotate pulsatingly within the cylindrical filter element 2. Compressed air is then used to perform pulsed backwashing on the filter element through the strip nozzles 5. Since only about 1 / 30 of the strip portion of the filter element is pulsed backwashed, the normal operation of the vehicle is not affected during filter element backwashing. This invention achieves rotation through the kinetic energy of the airflow, greatly reducing additional energy consumption. The cylindrical filter element 2 remains stationary, while the rotating pipe 3 at the center of each cylindrical filter element 2 is rotatable. The rotation of the rotating pipe 3 is achieved by the airflow from the strip nozzles 5 on both sides. Airflow holes 52 are respectively opened on the upper and lower sides of the strip nozzles 5 on both sides of the rotating pipe 3, forming a 90° angle with the exhaust hole 51. The airflow directions of the airflow holes 52 on both sides of the rotating pipe 3 are staggered, thus the airflow from the airflow holes 52 drives the strip nozzles 5 and the rotating pipe 3 to rotate. This ingenious structural design...

[0033] This invention achieves step-by-step self-rotation of the filter element through the jet vector of pulsed airflow, which not only greatly simplifies the structure of the device and reduces its size and weight, but also significantly increases its reliability and reduces additional energy consumption. The cylindrical filter element of this invention is stationary and self-sealing, avoiding the risks to the engine caused by seal failure and improving the filtration accuracy of the filter element. ,It can extend the overhaul period of equipment; this invention can realize the continuous operation of gas-using equipment, which not only reduces the labor intensity of drivers and improves manual efficiency, but also improves the utilization rate of equipment and increases economic benefits; in particular, the automatic continuous operation filter element self-cleaning keeps the engine intake pressure difference at a very low level automatically---reducing the intake pressure difference by 1 to 2 kPa compared with ordinary filters, which can increase engine efficiency by 2 to 3%, and the fuel saving effect is very significant.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A non-stop, self-pulse, self-cleaning air filter, characterized in that: The device includes a housing, a cylindrical filter element, a rotating pipe, a ventilation branch pipe, strip nozzles, and a pulse airflow duct. Multiple cylindrical filter elements are installed inside the housing. Air inlets are located around the top of the housing. Each cylindrical filter element has an air outlet at its lower end. A rotating pipe is rotatably installed at the center of each cylindrical filter element. The two sides of the rotating pipe are connected to strip nozzles via ventilation branch pipes. The strip nozzles are elongated and distributed inside the cylindrical filter elements. Multiple exhaust holes of different diameters are evenly distributed on the outer side of each strip nozzle from top to bottom, with the exhaust holes facing the cylindrical filter elements. Air jet holes are provided on the strip nozzles on both sides of the rotating pipe. The kinetic energy of the air jets from the two strip nozzles drives the rotating pipe and strip nozzles to rotate by an angle. A pulse airflow duct is installed at the bottom of the housing and connects to the lower ends of the multiple rotating pipes.

2. The non-stop self-pulse self-cleaning air filter according to claim 1, characterized in that, The strip nozzles on both sides of the rotating pipe are symmetrically arranged with the rotating pipe and have the same size and weight. Air jet holes are opened on the upper and lower ends of the strip nozzles, and the openings of the air jet holes and the openings of the exhaust holes form a 90° angle. The opening directions of the air jet holes of the strip nozzles on both sides of the rotating pipe are staggered.

3. The non-stop self-pulse self-cleaning air filter according to claim 1, characterized in that, It also includes a pulse control component; the pulse control component includes an accumulator, a pressure reducing valve, a pulse valve, a differential pressure sensor, and a controller; the accumulator and the controller are both installed outside the housing, and the accumulator inputs compressed air into the pulse airflow duct through the pressure reducing valve and the pulse valve; a differential pressure sensor is installed at the air outlet; the differential pressure sensor and the pulse valve are both connected to the controller.

4. The non-stop self-pulse self-cleaning air filter according to claim 3, characterized in that, A dust discharge port is provided on one side of the lower end of the casing; a dust exhaust fan is provided at the dust discharge port; the dust exhaust fan is connected to the controller.

5. The non-stop self-pulse self-cleaning air filter according to claim 1, characterized in that, Multiple inner liner supports are installed inside the casing, and a cylindrical filter element is sleeved on the outside of each inner liner support; a one-way rotating bearing and a rotary joint are respectively provided at the top and bottom of the inner liner support; the pulse airflow duct is connected to the lower end of the rotating pipe through the rotary joint; the upper end of the rotating pipe is rotatably connected to the one-way rotating bearing.

6. The non-stop self-pulse self-cleaning air filter according to claim 1, characterized in that, The multiple cylindrical filter elements inside the housing are separated by partitions.

7. A control method for a non-stop self-pulse self-cleaning air filter according to claim 4, characterized in that, The steps are as follows: When the cartridge filter element is very dirty and the differential pressure sensor detects that the intake differential pressure has reached a certain set value, the controller detects the signal from the differential pressure sensor and outputs a pulse signal to the pulse valve to achieve multi-channel electrical pulse output. The high-pressure air introduced from the accumulator passes through the pressure reducing valve, pulse valve, pulse airflow duct, rotating pipe, ventilation branch pipe, and strip nozzle in sequence. In this way, the high-pressure airflow performs a strong pulse backwash on the cartridge filter element through the exhaust hole of the strip nozzle. At the same time, the jet holes on the strip nozzles on both sides of the rotating pipe also spray high-pressure airflow. The jet holes on the two strip nozzles drive the rotating pipe and strip nozzles to rotate by an angle through the kinetic energy of the airflow. Thus, when the pulse valve delivers airflow each time, the rotating pipe, ventilation branch pipe, and strip nozzle rotate synchronously once. At the same time, the exhaust hole performs a strong pulse backwash on the cartridge filter element. When the number of pulses output by the controller reaches the predetermined set value, the cleaning is completed, and the controller stops driving the pulse valve.

8. The control method for the non-stop self-pulse self-cleaning air filter according to claim 7, characterized in that, When the controller outputs a pulse to the pulse valve, it simultaneously outputs an electrical signal to the dust exhaust fan. The dust exhaust fan rotates and sucks up the dust, causing the dust blown out of the cylindrical filter element to be discharged through the dust discharge port. When the pulse output stops, the backwashing of the cylindrical filter element stops, the electrical signal output by the controller to the dust exhaust fan also stops, and the dust exhaust fan stops running.

9. The control method for the non-stop self-pulse self-cleaning air filter according to claim 7, characterized in that, The backflush area of ​​the strip nozzle is less than 1 / 30 of the entire annular area of ​​the filter element.

10. The control method for the non-stop self-pulse self-cleaning air filter according to claim 7, characterized in that, The pulse signal is a multi-channel electrical pulse with a pulse width T1 of 50–120 ms and a pulse interval T2 of 10–15 s; the rotation angle of the strip nozzle is determined by the diameter Φ of the jet hole opened on the strip nozzle. X The pulse width T1 is determined.

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