Air filtering system and working method of air filtering system

Abstract

The invention provides an air filtering system and a working method of the air filtering system.The air filtering system comprises a filter body, a cleaning device, a pressure sensor and a control unit, the filter body comprises a filter element and a shell, and the filter element is arranged in the shell; one end of the cleaning device extends into the shell and is used for cleaning the filter element. The pressure sensors are used for respectively measuring pressure values at the inlet position and the outlet position of the filter main body so as to obtain pressure data. The cleaning device and the pressure sensor are in communication connection with the control unit, and the control unit is used for comparing the pressure data with a set value and starting or stopping the cleaning device according to a comparison result. According to the air filtering system, the filter element can be automatically cleaned, so that the filtering efficiency of the filter element is improved, the service life of equipment is prolonged, the manual maintenance frequency is reduced, the operation cost and the maintenance cost of an air compressor system are saved, the use convenience of the system is improved, and continuous and efficient work of the air compressor is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to an air filtration system and a working method of the air filtration system. Background Art

[0002] In the screw air compressor system, the air filter is used to filter dust and impurities in the compressed air to ensure the operating efficiency of the air compressor.

[0003] The existing air filtration system has the following problems: 1. The filter element is seriously clogged, which increases the air intake resistance of the air compressor and reduces the compression efficiency of the air compressor; 2. Frequent cleaning and maintenance of the filter element requires manual intervention, which increases the downtime and maintenance cost of the air compressor; 3. The life of the filter element is short, and frequent replacement of the filter element increases the operating cost and maintenance cost of the equipment.

[0004] Therefore, for technicians in this field, how to design an air filtration system that can realize automatic cleaning of the filter to reduce maintenance frequency, improve filtration efficiency and equipment life is a technical problem that urgently needs to be solved. Summary of the invention

[0005] The object of the present invention is to provide an air filtration system and a working method of the air filtration system, which can automatically clean the filter element to improve the filtration efficiency of the filter element and the service life of the equipment, reduce the frequency of manual maintenance, save the operating cost and maintenance cost of the air compressor system, improve the convenience of system use, and ensure that the air compressor continues to work efficiently.

[0006] To achieve the above-mentioned purpose, the present invention provides an air filtration system, including a filter body, a cleaning device, a pressure sensor and a control unit, wherein the filter body includes a filter element and a housing, and the filter element is arranged in the housing; one end of the cleaning device extends into the housing and is used to clean the filter element; the pressure sensor is used to measure the pressure values ​​at the inlet position and the outlet position of the filter body respectively, and then obtain pressure data; the cleaning device and the pressure sensor are respectively communicated with the control unit, and the control unit is used to compare the pressure data with the set value, and turn on or off the cleaning device according to the comparison result.

[0007] Optionally, the pressure sensor includes a differential pressure sensor, the differential pressure sensor having a first end and a second end, the first end being arranged at the inlet position of the filter body, and the second end being arranged at the outlet position of the filter body, and the pressure data being the pressure difference between the inlet position and the outlet position measured by the differential pressure sensor; the control unit is used to start the cleaning device when the pressure difference is greater than a set value.

[0008] Optionally, the cleaning device includes a nozzle, a spray pipeline and a pulse spray unit connected in sequence, and the nozzle is arranged inside the filter element; the pulse spray unit is used to provide compressed air, and the nozzle is used to spray the compressed air toward the inner surface of the filter element to remove dust on the surface of the filter element.

[0009] Optionally, the cleaning device also includes a cleaning control valve, which is arranged on the blowing pipeline and is communicatively connected to the control unit; the control unit is used to control the on-off of the blowing pipeline through the cleaning control valve, and to adjust the air flow in the blowing pipeline through the cleaning control valve.

[0010] Optionally, the air filtration system also includes a dust collecting device and an emission mechanism, wherein the dust collecting device is connected to the outer shell, and is used to collect dust falling from the surface of the filter element; the emission mechanism is connected to the dust collecting device and is used to discharge dust in the dust collecting device.

[0011] Optionally, the discharge mechanism is configured as an ash discharge valve, which is communicatively connected to the control unit and is used to be opened or closed under the control of the control unit.

[0012] Optionally, the air filtration system also includes a weighing sensor, which is arranged on the dust collecting device and is used to measure the total amount of dust in the dust collecting device; the weighing sensor is communicatively connected with the control unit, and the control unit is used to open the ash discharge valve when the total amount of dust in the dust collecting device is greater than or equal to a preset amount.

[0013] Optionally, an observation port is provided on the shell of the dust collecting device, and scale lines are provided on the observation port; the control unit is used to open the ash discharge valve when the total amount of dust in the dust collecting device reaches a preset scale line.

[0014] To achieve the above object, the present invention further provides a working method of an air filtration system, which is applied to any of the air filtration systems described above, and the working method comprises:

[0015] S01: When the filter body filters the air, the pressure values ​​at the inlet and outlet of the filter body are monitored in real time by the pressure sensor to obtain pressure data;

[0016] S02: comparing the pressure data with a set value, and the control unit turning on or off the cleaning device according to the comparison result;

[0017] S03: After the cleaning device is turned on, compressed air is sprayed toward the surface of the filter element to remove dust from the surface of the filter element.

[0018] Optionally, the air filtration system further comprises a dust collecting device and an ash discharge valve, wherein the dust collecting device is arranged below the filter body and communicates with the housing; the ash discharge valve is connected to the dust collecting device and is in communication connection with the control unit;

[0019] The working method also includes:

[0020] S04: dust on the filter element is peeled off and collected into the dust collecting device;

[0021] S05: When the total amount of dust in the dust collecting device reaches a preset amount, the control unit opens the dust discharge valve to discharge the dust in the dust collecting device.

[0022] Optionally, the working method of the air filtration system further includes:

[0023] S06: The control unit records the number of times the cleaning device cleans the filter element and the operating status of the filter element.

[0024] The present invention provides an air filtration system and a working method of the air filtration system. The air filtration system can monitor the pressure values ​​at both ends of the filter body in real time through a pressure sensor, and then monitor the operating state of the filter element. The air filtration system can automatically trigger a cleaning program when the operating state of the filter element reaches a set condition, so as to clean the filter element through a cleaning device.

[0025] With this arrangement, on the one hand, the air filtration system can realize automatic cleaning and maintenance of the filter element, improve the filtration efficiency of the filter element, increase the service life of the filter body, ensure that the air compressor always operates at a low pressure difference, and thus ensure the air intake and energy efficiency of the air compressor. At the same time, the cleaning operation of the filter element will not affect the normal operation of the air filter system, which can ensure the continuous and efficient operation of the air compressor.

[0026] On the other hand, the air filtration system can automatically remove dust from the surface of the filter element, reduce the risk of filter element clogging, reduce the frequency of filter element replacement, extend the service life of the filter element, and improve the overall economic benefits.

[0027] In addition, the air filtration system can achieve automatic cleaning, reduce the frequency of manual maintenance, reduce the number of manual cleaning times, reduce downtime, save the operating cost and maintenance cost of the air compressor system, and improve the convenience of system use. It has wide practicality and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of an air filtration system in a preferred embodiment of the present invention;

[0029] Figure 2It is a structural block diagram of an air filtration system in a preferred embodiment of the present invention;

[0030] Figure 3 The figure is a flow chart of the working method of the air filtration system in a preferred embodiment of the present invention.

[0031] In the figure:

[0032] Filter body 1; filter element 11; housing 12; inlet position 13; outlet position 14; cleaning device 2; nozzle 21; spray pipeline 22; pulse spray unit 23; cleaning control valve 24; pressure sensor 3; first end 31; second end 32; control unit 4; dust collecting device 5; discharge mechanism 6; weighing sensor 7. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are in very simplified form and in non-precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or a connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0036] Furthermore, those skilled in the art may combine and associate different embodiments or examples and features of different embodiments or examples described in this specification without mutual contradiction.

[0037] Reference Figure 1 and Figure 2As shown, a preferred embodiment of the present invention provides an air filtration system, including a filter body 1, a cleaning device 2, a pressure sensor 3 and a control unit 4. The filter body 1 includes a filter element 11 and a housing 12, and the filter element 11 is arranged in the housing 12. One end of the cleaning device 2 extends into the housing 12 and is used to clean the filter element 11.

[0038] Specifically, the cleaning device 2 is used to spray compressed air onto the surface of the filter element 11 to remove dust and impurities on the surface of the filter element 11. The pressure sensor 3 is used to measure the pressure values ​​at the inlet position 13 and the outlet position 14 of the filter body 1, respectively, and then obtain pressure data. The cleaning device 2 and the pressure sensor 3 are respectively connected to the control unit 4 for communication. The control unit is used to compare the pressure data with the set value, and turn on or off the cleaning device according to the comparison result. When the cleaning device 2 is turned on, the filter element 11 can be cleaned.

[0039] Reference Figure 1 As shown, in a specific example, the inlet position 13 is arranged on the side wall of the housing 12 , and the outlet position 14 is arranged on the bottom wall of the housing 12 .

[0040] The present invention provides an air filtration system, which can monitor the pressure values ​​at both ends of the filter body 1 (i.e., the inlet position 13 and the outlet position 14) in real time through a pressure sensor 3, and then monitor the operating state of the filter element 11. The air filtration system can automatically trigger a cleaning program when the operating state of the filter element 11 reaches a set condition, so as to clean the filter element 11 through a cleaning device 2.

[0041] With such a configuration, on the one hand, the air filtration system can realize automatic cleaning and maintenance of the filter element 11, improve the filtration efficiency of the filter element 11, and extend the service life of the filter body 1, thereby ensuring that the air compressor (such as a screw air compressor) always operates at a low pressure difference, thereby ensuring the air intake and energy efficiency of the air compressor. At the same time, the cleaning operation of the filter element 11 will not affect the normal operation of the air filter system, and can ensure that the air compressor continues to work efficiently.

[0042] On the other hand, the air filtration system can automatically remove dust from the surface of the filter element 11, reduce the risk of clogging of the filter element 11, reduce the frequency of replacing the filter element 11, extend the service life of the filter element, and improve the overall economic benefits.

[0043] In addition, the air filtration system can achieve automatic cleaning, reduce the frequency of manual maintenance, reduce the number of manual cleaning times, reduce downtime, save the operating cost and maintenance cost of the air compressor system, and improve the convenience of system use. It has wide practicality and promotion value.

[0044] Preferably, the filter element 11 is made of washable materials, including but not limited to nanofiber filter materials. This not only makes it easier for the cleaning device 1 to clean the filter element 11, but also enables the filter element 11 to have higher filtration efficiency and durability, thereby extending the service life of the filter element 1.

[0045] It should be noted that, in addition to being set according to the test results of the pressure sensor 3, the cleaning frequency of the filter element 11 can also be set and adjusted with reference to the actual operating conditions of the filter element 11 (including parameters such as the usage time and frequency of use of the filter element 11) to achieve regular cleaning of the filter element 11.

[0046] Reference Figure 1 As shown, as a preferred embodiment, the pressure sensor 3 includes a differential pressure sensor, the differential pressure sensor has a first end 31 and a second end 32, the first end 31 is arranged at the inlet position 13 of the filter body 1, and the second end is arranged at the outlet position 14 of the filter body 1. The pressure data is the pressure difference ΔP1 between the inlet position 13 and the outlet position 14 measured by the differential pressure sensor.

[0047] It should be noted that when the air is filtered through the filter body 1, the filter element 11 gradually absorbs dust and impurities in the air to cause blockage, and the pressure at the outlet position 14 of the filter body 1 will gradually decrease, so that the pressure value at the outlet position 14 of the filter body 1 is less than the pressure value at the inlet position 13 of the filter body 1. At the same time, the real-time pressure value at the outlet position 14 of the filter body 1 is also less than the initial pressure value at the outlet position 14 of the filter body 1. Therefore, as the use time of the filter element 11 increases, the pressure difference ΔP1 of the filter body 1 detected by the differential pressure sensor gradually increases.

[0048] Furthermore, the control unit 4 is used to control the filter body 1 to have a pressure difference ΔP1 greater than a first set value P 01 (i.e. ΔP1>P 01 ). As the filter element 11 becomes more and more blocked, the pressure difference ΔP1 of the filter body 1 will gradually increase. Thus, the air filtration system can automatically start the cleaning device 2 when the filter element 11 is blocked more seriously, so as to achieve regular cleaning of the filter element 11.

[0049] Furthermore, the control unit 4 is further configured to: when the pressure difference ΔP1 of the filter body 1 is less than or equal to the first set value P 01 (i.e. ΔP1≤P 01 ), in which case the clogging degree of the filter element 11 does not reach the cleaning standard, and the filter element 11 continues to operate normally.

[0050] In a specific example, the first preset value P 01It can be set to 1 to 3 times of the initial pressure difference between the two ends of the filter body 1 (ie, the inlet position 13 and the outlet position 14).

[0051] In another preferred embodiment, a pressure sensor 3 may be respectively set at the inlet position 13 and the outlet position 14 of the filter body 1, and the control unit 4 obtains the first pressure value P1 at the inlet position 13 of the filter body 1 and the second pressure value P2 at the outlet position 14 of the filter body 1 through the corresponding pressure sensors 3, and sets the difference or ratio between the first pressure value P1 and the second pressure value P2 as the pressure data.

[0052] In one example, the pressure data is the pressure ratio ΔP2 of the inlet position 13 and the outlet position 14 of the filter body 1, that is, ΔP2=P2 / P1. As the use time of the filter element 11 increases, the pressure ratio ΔP2 of the filter body 1 will gradually decrease. The target ratio of the second pressure value P2 to the first pressure value P1 is set to the second set value P 02 The control unit 4 is used to control the pressure ratio ΔP2 to be less than or equal to the second set value P 02 (i.e. ΔP2≤P 02 ) to start the cleaning device 2 to clean the filter element 11. The control unit 4 is also used to start the cleaning device 2 to clean the filter element 11 when the pressure ratio ΔP2 is greater than the second set value P 02 (i.e. ΔP2 is greater than P 02 ) when the cleaning device 2 is turned off, and the filter element 11 can continue to work normally.

[0053] In a specific example, the second setting value P 02 It can be set in the range of 0.1 to 0.4.

[0054] Reference Figure 1 As shown, the cleaning device 2 includes a nozzle 21, a spraying pipeline 22 and a pulse spraying unit 23 connected in sequence, the nozzle 21 is arranged in the filter element 11, and one end of the spraying pipeline 22 extends into the housing 12 and is connected to the nozzle 21. The pulse spraying unit 23 is used to provide compressed air, and the nozzle 21 is used to form the compressed air into a high-speed airflow and spray it to the inner surface of the filter element 11 to remove dust in the filter element 11.

[0055] In a preferred embodiment, one end of the spray pipeline 22 is provided as a cylindrical structure 221, and is located inside the filter element 11. The cylindrical structure 221 is provided with nozzles 21 in its axial direction and circumferential direction, respectively, so that the nozzles 21 substantially cover the entire inner surface of the filter element 22. The nozzles 21 can spray compressed air outward from the inside of the filter element 11, thereby stripping dust from the filter element 11 and blowing the dust onto the inner wall of the housing 21, so as to achieve the purpose of quickly removing dust.

[0056] The present application does not limit the number of nozzles 21 , and the number of nozzles 21 can be set to one or more, preferably to multiple, to effectively remove dust from the filter element 11 .

[0057] Continue to refer to Figure 1 and Figure 2 The cleaning device 2 further includes a cleaning control valve 24, which is disposed on the spraying pipeline 22 and is in communication with the control unit 4. The control unit 4 is used to control the on-off of the spraying pipeline 22 through the cleaning control valve 24, thereby realizing the opening and closing of the cleaning device 2. The control unit 4 is also used to adjust the air flow in the spraying pipeline 22 through the cleaning control valve 24, thereby controlling the jet amount of the nozzle 21.

[0058] See also Figure 1 In a preferred case, the air filtration system further includes a dust collecting device 5, which is connected to the housing 12. In one example, the dust collecting device 5 is disposed on the side wall of the housing 12, but is not limited thereto. The dust collecting device 5 is used to collect dust falling from the surface of the filter element 11, that is, dust can fall from the surface of the filter element 11 after being peeled off and collected in the dust collecting device 5.

[0059] Exemplarily, the air filtration system preferably further includes a discharge mechanism 6 , which is connected to the dust collecting device 5 and is used to discharge dust in the dust collecting device 5 .

[0060] Continue to refer to Figure 1 and Figure 2 The discharge mechanism 6 can be configured as an ash discharge valve, which is in communication with the control unit 4 and is used to be opened or closed under the control of the control unit 4. The air filtration system can periodically perform automatic ash discharge operation through the discharge mechanism 6 to prevent dust from accumulating in the dust collecting device 5 and causing secondary pollution to the filter element 11, thereby extending the service life of the filter element 11.

[0061] As a preferred solution, the air filtration system further includes a weighing sensor 7 (refer to Figure 1 and Figure 2 ), the weighing sensor 7 is arranged on the dust collecting device 5, and is used to measure the total amount of dust G1 (weight or volume of dust) in the dust collecting device 5. The weighing sensor 7 is in communication connection with the control unit 4, and the control unit 4 is used to open the dust discharge valve when the total amount of dust G1 in the dust collecting device 5 is greater than or equal to the preset amount G0 (i.e., G1 ≥ G0), so as to discharge the dust in the dust collecting device 5, thereby realizing automatic dust discharge of the air filtration system, reducing the frequency of manual maintenance, and improving the convenience of system use.

[0062] As another preferred solution, an observation port (not shown) is provided on the housing of the dust collecting device 5, and a scale line is provided on the observation port. The control unit 4 is used to open the dust discharge valve when the total amount of dust in the dust collecting device 5 reaches a preset scale line. Specifically, the operator can manually input a driving signal to the control unit 4 to open the dust discharge valve after observing that the total amount of dust reaches the preset scale line.

[0063] Reference Figure 3 As shown, a preferred embodiment of the present invention further provides a working method of an air filtration system, which is applied to any of the air filtration systems described above, and the working method comprises:

[0064] S01: When the filter body 1 filters the air, the pressure values ​​at the inlet position 13 and the outlet position 14 of the filter body 1 are monitored in real time by the pressure sensor 3 to obtain pressure data.

[0065] S02: Compare the pressure data with the set value, and the control unit 4 turns on or off the cleaning device 2 according to the comparison result.

[0066] S03: After the cleaning device 2 is turned on, compressed air is sprayed toward the surface of the filter element 11 to remove dust from the surface of the filter element 11 .

[0067] It should be noted that the external air needs to enter the filter body 1 for filtration before entering the air compressor. The dust and impurities in the air can be captured by the filter element 11 in the filter body 1 during filtration, and the filtered air can be delivered to the air compressor.

[0068] The present invention provides a working method of an air filtration system, which can monitor the pressure values ​​at both ends of a filter body 1 in real time through a pressure sensor 3, and further monitor the operating state of a filter element 11. The air filtration system can automatically trigger a cleaning program when the operating state of the filter element 11 reaches a set condition, so as to clean the filter element 11 through a cleaning device 2.

[0069] With such a configuration, on the one hand, the method can realize automatic cleaning and maintenance of the filter element 11 in the air filtration system, improve the filtration efficiency of the filter element 11, increase the service life of the filter body 1, and ensure that the air compressor (such as a screw air compressor) always operates at a low pressure difference, thereby ensuring the air intake and energy efficiency of the air compressor. On the other hand, the method can automatically remove dust on the surface of the filter element 11, reduce the risk of clogging of the filter element 11, reduce the frequency of replacing the filter element 11, extend the service life of the filter element, and improve the overall economic benefits.

[0070] Preferably, the working method of the air filtration system further comprises:

[0071] S04: The dust on the filter element 11 is peeled off and collected in the dust collecting device 5.

[0072] S05: When the total amount of dust G1 (volume or weight) in the dust collecting device 5 reaches a preset amount G0, the control unit 4 opens the dust discharge valve to discharge the dust in the dust collecting device 5.

[0073] More preferably, the working method of the air filtration system further comprises:

[0074] S06: The control unit 4 records the number of times the cleaning device 2 cleans the filter element 11 and the operating status of the filter element 11 (including the usage time and blockage status of the filter element 11), so as to remind the user to maintain or replace the filter element 11, thereby ensuring that the air compressor always operates at a low pressure difference, thereby ensuring the air intake volume and energy efficiency of the air compressor.

[0075] The present application has no particular restrictions on the type of control unit, which can be hardware that performs logical operations, such as a single-chip microcomputer, a microprocessor, a programmable logic controller (PLC) or a field programmable gate array (FPGA), or a software program, a functional module, a function, an object library (Object Libraries) or a dynamic link library (Dynamic-Link Libraries) that implements the above functions based on hardware. It should be known how to specifically implement the communication between the control unit and other devices. In addition, the use of a controller is the preferred mode of this embodiment, and those skilled in the art can use other technical means, such as manual control, mechanical control, to achieve the same technical effect.

[0076] In summary, the present invention provides an air filtration system and a working method of the air filtration system, wherein the air filtration system can monitor the pressure values ​​at both ends of the filter body 1 in real time through the pressure sensor 3, and then monitor the operating state of the filter element 11. The air filtration system can automatically trigger a cleaning program when the operating state of the filter element 11 reaches a set condition, so as to clean the filter element 11 through the cleaning device 2.

[0077] With such a configuration, on the one hand, the air filtration system can realize automatic cleaning and maintenance of the filter element 11, improve the filtration efficiency of the filter element 11, and extend the service life of the filter body 1, thereby ensuring that the air compressor always operates at a low pressure difference, thereby ensuring the air intake and energy efficiency of the air compressor. In addition, the cleaning operation of the filter element 11 will not affect the normal operation of the air filter system, thus ensuring that the air compressor continues to operate efficiently.

[0078] On the other hand, the air filtration system can automatically remove dust from the surface of the filter element 11, reduce the risk of clogging of the filter element 11, reduce the frequency of replacing the filter element 11, extend the service life of the filter element 11, and improve the overall economic benefits.

[0079] In addition, the air filtration system can achieve automatic cleaning, reduce the frequency of manual maintenance, reduce the number of manual cleaning times, reduce downtime, save the operating cost and maintenance cost of the air compressor system, and improve the convenience of system use. It has wide practicality and promotion value.

[0080] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the protection scope of the present invention.

Claims

1. An air filtration system, characterized in that: It includes a filter body, a cleaning device, a pressure sensor and a control unit, the filter body includes a filter element and a shell, the filter element is arranged in the shell; one end of the cleaning device extends into the shell and is used to clean the filter element; the pressure sensor is used to measure the pressure values ​​at the inlet position and the outlet position of the filter body respectively, so as to obtain pressure data; the cleaning device and the pressure sensor are respectively connected to the control unit for communication, and the control unit is used to compare the pressure data with the set value, and turn on or off the cleaning device according to the comparison result.

2. The air filtration system according to claim 1, characterized in that: The pressure sensor includes a differential pressure sensor, the differential pressure sensor having a first end and a second end, the first end being arranged at the inlet position of the filter body, the second end being arranged at the outlet position of the filter body, and the pressure data being the pressure difference between the inlet position and the outlet position measured by the differential pressure sensor; the control unit is used to start the cleaning device when the pressure difference is greater than a set value.

3. The air filtration system according to claim 1, characterized in that: The cleaning device includes a nozzle, a spray pipeline and a pulse spray unit connected in sequence, and the nozzle is arranged inside the filter element; the pulse spray unit is used to provide compressed air, and the nozzle is used to spray the compressed air toward the inner surface of the filter element to remove dust inside the filter element.

4. The air filtration system according to claim 3, characterized in that: The cleaning device also includes a cleaning control valve, which is arranged on the blowing pipeline and is communicatively connected to the control unit; the control unit is used to control the on-off of the blowing pipeline through the cleaning control valve, and to adjust the air flow in the blowing pipeline through the cleaning control valve.

5. The air filtration system according to claim 1, characterized in that: It also includes a dust collecting device and a discharge mechanism. The dust collecting device is connected to the shell and is used to collect dust falling from the surface of the filter element. The discharge mechanism is connected to the dust collecting device and is used to discharge dust in the dust collecting device.

6. The air filtration system according to claim 5, characterized in that: The discharge mechanism is configured as an ash discharge valve, which is communicatively connected with the control unit and is used to be opened or closed under the control of the control unit.

7. The air filtration system according to claim 6, characterized in that: It also includes a weighing sensor, which is arranged on the dust collecting device and is used to measure the total amount of dust in the dust collecting device; the weighing sensor is communicatively connected with the control unit, and the control unit is used to open the ash discharge valve when the total amount of dust in the dust collecting device is greater than or equal to a preset amount.

8. The air filtration system according to claim 6, characterized in that: The housing of the dust collecting device is provided with an observation port, and scale lines are provided on the observation port; the control unit is used to open the dust discharge valve when the total amount of dust in the dust collecting device reaches a preset scale line.

9. A method for operating an air filtration system, characterized in that: Applied to the air filtration system according to any one of claims 1 to 8, the working method comprises: S01: When the filter body filters the air, the pressure values ​​at the inlet and outlet of the filter body are monitored in real time by the pressure sensor to obtain pressure data; S02: comparing the pressure data with a set value, and the control unit turning on or off the cleaning device according to the comparison result; S03: After the cleaning device is turned on, compressed air is sprayed toward the surface of the filter element to remove dust from the surface of the filter element.

10. The operating method of the air filtration system according to claim 9, characterized in that: The air filtration system further comprises a dust collecting device and an ash discharge valve, wherein the dust collecting device is arranged below the filter body and communicates with the housing; the ash discharge valve is connected to the dust collecting device and is in communication connection with the control unit; The working method also includes: S04: dust on the filter element is peeled off and collected into the dust collecting device; S05: When the total amount of dust in the dust collecting device reaches a preset amount, the control unit opens the dust discharge valve to discharge the dust in the dust collecting device.

11. The operating method of the air filtration system according to claim 9, characterized in that: Also includes: S06: The control unit records the number of times the cleaning device cleans the filter element and the operating status of the filter element.

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