Novel self-cleaning air filtering equipment

Abstract

The utility model discloses novel self-cleaning air filtering equipment which comprises a case, a fan, a cyclone device, a filtering barrel, a self-cleaning module, a first dust collecting box and a second dust collecting box, wherein the first dust collecting box and the second dust collecting box are arranged below the cyclone device and the filtering barrel and are used for receiving filter residues; the cyclone device divides the case into a first cavity, a second cavity and a third cavity from top to bottom, and the second cavity in the middle of the cyclone device corresponds to the first air inlet of the case; a fourth cavity and a sixth cavity which are used for containing the filtering barrel and the self-cleaning module respectively are further formed in the machine box, a fifth cavity is formed between the fourth cavity and the sixth cavity for communication, an inlet and an outlet of the draught fan are located in the fifth cavity and the sixth cavity respectively, a first one-way valve is arranged between the first cavity and the fourth cavity for communication, and a second one-way valve is arranged between the second cavity and the sixth cavity for communication. And the sixth cavity is communicated with the first air outlet of the case.

Description

Technical fields:

[0001] This utility model relates to the field of environmental protection equipment, and specifically refers to a new type of self-cleaning air filtration device. Background technology:

[0002] Air filters are devices used to remove harmful substances from the air and are widely used in industrial production. In industrial processes such as machining, chemical production, and combustion, large amounts of toxic and harmful waste gases and particulate matter, such as oil mist, dust, volatile organic compounds (VOCs), and fumes, are generated. These pollutants pose a threat to worker health and the normal operation of equipment. Industrial air filters, through multi-stage filtration technologies such as bag filters, HEPA filters, activated carbon filters, and electrostatic precipitators, can effectively remove particulate matter and harmful gases from waste gases, improve the workshop environment, reduce equipment wear and tear, and ensure compliance with environmental emission standards.

[0003] For example, the air filtration device for machine tools disclosed in Chinese Patent Publication No. CN202962159U features an air inlet at one end of a housing, a negative pressure forming chamber at the other end, an air outlet on the negative pressure forming chamber, and a filtration mechanism inside the housing. The filtration mechanism includes a support within a filter chamber, a diffusion and flow guiding structure and a filtration structure distributed axially along the air inlet on the support, a drain mechanism at the lower part of the housing and the negative pressure forming chamber, and an installation port at the upper part of the housing for mounting the filtration mechanism. A cover plate is connected to the installation port via an opening and closing mechanism, and a sealing structure is provided between the cover plate and the installation port. The diffusion and flow guiding structure and the filtration structure enhance the filtration accuracy of the entire device, improve the filtration effect, and extend the service life of the filtration device. The installation port and the opening and closing mechanism facilitate the disassembly, assembly, and cleaning of the filtration mechanism.

[0004] However, the aforementioned existing technologies still have the following problems:

[0005] 1. The filter mechanism 4 needs to be frequently disassembled and cleaned, which not only affects the operation of the machine tool, but also is time-consuming, labor-intensive, and costly.

[0006] 2. The single filter mechanism 4 has a limited filtration range and cannot achieve efficient filtration of particles of different sizes. It is also very easy to cause a decrease in the filtration effect of the filter mechanism 4, requiring frequent maintenance.

[0007] 3. The negative pressure forming box 3 and the air inlet 2 are located at opposite ends of the casing 1, causing the airflow to directly impact the filter mechanism 4. The lack of buffer flow equalization space results in excessively fast flow rate, which reduces the filtration effect of the filter mechanism 4.

[0008] In view of the above, the inventors propose the following technical solution. Utility model content:

[0009] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a new type of self-cleaning air filtration device.

[0010] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a novel self-cleaning air filtration device, comprising: a casing, a fan, a cyclone device, a filter barrel, a self-cleaning module, and a first dust collection box and a second dust collection box disposed below the cyclone device and the filter barrel for receiving filter residue; the cyclone device divides the casing into a first cavity, a second cavity, and a third cavity from top to bottom, and the second cavity in the middle of the cyclone device corresponds to the first air inlet of the casing; the casing is also provided with a fourth cavity and a sixth cavity for accommodating the filter barrel and the self-cleaning module, respectively, and a fifth cavity is provided between the fourth cavity and the sixth cavity, and the inlet and outlet of the fan are located in the fifth cavity and the sixth cavity, respectively; a first one-way valve is provided between the first cavity and the fourth cavity, and the sixth cavity is connected to the first air outlet of the casing.

[0011] Furthermore, in the above technical solution, the self-cleaning module includes a rotary backflushing device located inside the filter barrel and capable of rotation, an air tank installed in the chassis, a connecting hose connecting the air tank and the rotary backflushing device, an air valve installed on the connecting hose, and an oil-water separator installed on the connecting pipe between the air tank and the external air source.

[0012] Furthermore, in the above technical solution, the rotary backflushing device includes a support pipe that is connected to a hose and extends into the filter barrel, and a rotary jet pipe frame that is rotatably installed at the lower end of the support pipe and can spray airflow to the side. The rotary jet pipe frame is provided with at least two rows of vertically arranged jet holes.

[0013] Furthermore, in the above technical solution, a first cover plate is slidably mounted on the support tube. The diameter of the first cover plate is larger than the first connecting hole between the fourth cavity and the fifth cavity. An air collecting hood that can cover the first cover plate is installed at the upper end of the support tube. A sleeve portion that can extend into the air collecting hood is provided at the upper end of the first cover plate. A pressure relief hole is provided on the tube wall of the support tube for introducing airflow into the air collecting hood to push the first cover plate downward to cover the first connecting hole. A reset spring for lifting the first cover plate to open the first connecting hole is also mounted on the support tube.

[0014] Furthermore, in the above technical solution, the chassis is also provided with a second one-way valve located next to the filter barrel and used for rapid gas discharge when the rotary backflushing device blows air. A silencer is provided on the outside of the second one-way valve, and the upper end of the silencer is connected to the sixth cavity. The first air outlet of the chassis is located at the upper end of the silencer.

[0015] Furthermore, in the above technical solution, the gas valve is a solenoid valve, and it has two switchable modes: timed gas explosion and manual gas explosion. The chassis is equipped with a selection switch for switching between timed gas explosion and manual gas explosion. The chassis is equipped with a timer for controlling the gas valve to cause gas explosion at a specific time, and a pulse meter located next to the timer.

[0016] Furthermore, in the above technical solution, the cyclone device includes a second air inlet located at the center and corresponding to the second cavity, several second air outlets and dust discharge ports disposed around the second air inlet and facing upward and downward respectively, and several guide air channels connected to the central second air inlet and spirally coiled outward on the second air outlet. The second air outlet and dust discharge port are located in the first cavity and the third cavity respectively, and the dust discharge port is funnel-shaped.

[0017] Furthermore, in the above technical solution, multiple cyclone devices are provided, and a first mounting plate is provided inside the casing between the first cavity and the second cavity for installing the cyclone devices. The first mounting plate is installed at an angle so that the second air outlet faces the first one-way valve.

[0018] Furthermore, in the above technical solution, a first filter screen for filtering large particles is provided in the first air inlet. The first filter screen is located between the first air inlet and the second cavity, and an inlet cavity for accommodating large particles is provided in the first air inlet.

[0019] Furthermore, in the above technical solution, the chassis includes an upper chassis and a lower chassis. The fan and self-cleaning module are located in the upper chassis, and the cyclone device and filter barrel are located in the lower chassis. The first dust collection box and the second dust collection box are symmetrically installed at the bottom of the lower chassis and can be pulled out to both sides respectively. An inner shell is installed in the upper chassis, covering the filter barrel and forming a fifth cavity. The fan is installed on the inner shell, and one end of the self-cleaning module extends through the inner shell into the filter barrel.

[0020] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: In the present invention, a fan generates negative pressure suction in the casing, drawing in external air from the first air inlet of the casing. The air is first centrifugally separated by a cyclone device, separating large dust particles from the air and causing them to fall into the first dust collection box. After filtration, the air entering the fourth chamber is filtered again by the filter barrel before entering the fifth chamber, and is then extracted by the fan and discharged into the sixth chamber, finally exiting from the first air outlet, thus achieving multiple filtration of the air. When a certain thickness of dust accumulates on the filter barrel, a high-speed airflow is sprayed into the filter barrel through the self-cleaning module to generate an air explosion. Under the impact of the airflow, the dust attached to the filter barrel is blown off into the second dust collection box, achieving reverse flushing of the filter barrel. This significantly improves the service life of the filter barrel, reduces the number of times the filter barrel is replaced, and reduces the cost of use. Attached image description:

[0021] Figure 1 This is a schematic diagram of the internal structure of this utility model;

[0022] Figure 2 This is a schematic diagram of gas flow in the filtered state of this utility model;

[0023] Figure 3 This is a schematic diagram of the gas flow in the backwashing state of this utility model;

[0024] Figure 4 This is a schematic diagram of the disassembly of the silencer cover in this utility model;

[0025] Figure 5 This is a schematic diagram of the internal structure of the upper chassis in the open state in this utility model. Figure 1 ;

[0026] Figure 6 This is a schematic diagram of the internal structure of the upper chassis in the open state in this utility model. Figure 2 ;

[0027] Figure 7 This is a perspective view of the present invention;

[0028] Figure 8 This is a schematic diagram of the rotary backflush device in this utility model;

[0029] Figure 9 This is a cross-sectional view of the rotary backflushing device in this utility model;

[0030] Figure 10 This is a schematic diagram of the cyclone device in this utility model. Detailed implementation method:

[0031] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0032] See Figures 1 to 10As shown, a novel self-cleaning air filtration device includes: a housing 1, a fan 2, a cyclone device 3, a filter cartridge 4, a self-cleaning module 5, and a first dust collection box 6 and a second dust collection box 7 located below the cyclone device 3 and the filter cartridge 4 to collect filter residue. The cyclone device 3 divides the housing 1 from top to bottom into a first cavity A, a second cavity B, and a third cavity C, with the second cavity B in the middle of the cyclone device corresponding to the first air inlet 101 of the housing 1. The housing 1 also has a fourth cavity D and a sixth cavity F, which are respectively used to accommodate the filter cartridge 4 and the self-cleaning module 5. A fifth cavity E is provided between the fourth cavity D and the sixth cavity F, and the inlet and outlet of the fan 2 are located in the fifth cavity E and the sixth cavity F, respectively. A first one-way valve 19 is provided between the first cavity A and the fourth cavity D, and the sixth cavity F is connected to the first air outlet 102 of the housing 1. A negative pressure suction force is generated inside the casing 1 by a fan 2, drawing in outside air through the first air inlet 101. The air is first centrifugally separated by a cyclone device 3, with large dust particles falling into the first dust collection box 6. After filtration, the air enters the fourth chamber D, is filtered again by the filter cartridge 4, and then enters the fifth chamber E. Finally, it is extracted by the fan 2 and discharged into the sixth chamber F, exiting through the first air outlet 102. This achieves multiple filtration of the air. When a certain thickness of dust accumulates on the filter cartridge 4, a high-speed airflow is injected into the filter cartridge 4 through the self-cleaning module 5, creating an air explosion. Under the impact of the airflow, the dust adhering to the filter cartridge 4 is blown off into the second dust collection box 7, achieving reverse flushing of the filter cartridge 4. This significantly extends the service life of the filter cartridge 4, reduces the frequency of replacement, and lowers operating costs. Of course, to ensure that exhaust gas can smoothly enter the casing 1, a blower can be added to the external pipe of the first air inlet 101 to ensure that the airflow entering the casing 1 meets the requirements.

[0033] The self-cleaning module 5 includes a rotating backflushing device 51 located inside the filter cartridge 4, a gas storage tank 52 installed in the housing 1, a connecting hose 53 connecting the gas storage tank 52 and the rotating backflushing device 51, a gas valve 54 installed on the connecting hose 53, and an oil-water separator 55 installed on the connecting pipe between the gas storage tank 52 and the external gas source. The gas storage tank 52 stores sufficient gas, and an oil-water separator 55 is installed at the connection point between the gas storage tank 52 and the gas source. The oil-water separator 55 separates and filters the water vapor from the gas entering the gas storage tank 52, ensuring that the air used for backflushing is free of moisture. This prevents water vapor from being sprayed onto the non-woven fabric of the filter cartridge 4 with the backflushing gas, thus preventing the non-woven fabric from becoming wet and affecting normal filtration. This ensures that backflushing will not damage the filter cartridge 4 and extends its service life.

[0034] When backwashing is required, the gas in the gas storage tank 52 is controlled by the air valve 54 to be sprayed out from the rotary back-flushing device 51 through the connecting hose 53. As the high-pressure gas is sprayed into the filter barrel 4 from the rotary back-flushing device 51, the pressure will drop sharply. During the pressure release process, a thrust will be generated. When the thrust has an inclined angle with the rotation center, it will drive the rotary back-flushing device 51 to rotate. At the same time, the gas will generate an air explosion during the rapid pressure release to perform high-pressure air blowing and rinsing of the filter barrel 4, thereby blowing the dust on the side wall of the filter barrel 4 into the second dust collection box 7. During the high-speed rotation of the rotary back-flushing device 51, the high-speed airflow will continuously rotate and impact the outer wall of the filter barrel 4, achieving 360° no dead angle rinsing.

[0035] The rotary backflushing device 51 includes a support pipe 511 that is connected to a hose 53 and extends into the filter barrel 4, and a rotary jet pipe frame 512 that is rotatably installed at the lower end of the support pipe 511 and can spray airflow to the side. The rotary jet pipe frame 512 is provided with at least two rows of vertically arranged jet holes 513. The two rows of jet holes 513 are symmetrically located on both sides of the support pipe 511. When high-pressure gas is ejected from the two rows of jet holes 513, the same and opposite rotational thrust is generated, thereby causing the rotary jet pipe frame 512 to rotate. Of course, in order to ensure that the rotary jet pipe frame 512 can rotate smoothly, the jet holes 513 can be set to an inclined orientation, so that when the gas is ejected from the jet holes 513, a shearing force is generated relative to the support pipe 511, so that the rotary jet pipe frame 512 can rotate more quickly.

[0036] The rotating jet pipe bracket 512 includes a support rod 512A that abuts against the lower end of the support pipe 511; a connecting seat 512B that is sleeved and installed on the upper end of the support rod 512A and can rotate relative to it; a first exhaust pipe 512C and a second exhaust pipe 512D that are disposed at both ends of the connecting seat 512B and parallel to the support rod 512A; a connecting seat 512E that is sleeved and installed on the lower end of the support rod 512A and is used to connect and support the first exhaust pipe 512C and the second exhaust pipe 512D; and a support sleeve that is disposed between the connecting seat 512B and the connecting seat 512E and sleeved on the support rod 512A. The support rod 512A and the connecting seat 512B and the connecting seat 512E are respectively provided with a first bearing 512J and a second bearing 512K. Air jet holes 513 are vertically arranged on the first exhaust pipe 512C and the second exhaust pipe 512D. The upper part of the support rod 512A is provided with a first inner through hole 512G for airflow through a connecting support pipe 511. The connecting seat 512B is provided with a second inner through hole 512H and a third inner through hole 512I for connecting the first inner through hole 512G with the first exhaust pipe 512C and the second exhaust pipe 512D. The first exhaust pipe 512C, the second exhaust pipe 512D, and the support sleeve 512F are metal parts. The connecting seat 512B and the connecting seat 512E are injection molded parts, and the connecting seat 512B and the connecting seat 512E are integrally injection molded at both ends of the first exhaust pipe 512C, the second exhaust pipe 512D, and the support sleeve 512F. The ends of the first bearing 512J and the second bearing 512K are respectively mounted on the support rod 512A via snap rings.

[0037] The support sleeve 512F described above has two embodiments:

[0038] In the first configuration, the support sleeve 512F is only fitted onto the support rod 512A between the connecting seat 512B and the connecting seat 512E. In this configuration, the first bearing 512J is located between the connecting seat 512B and the support rod 512A, and the second bearing 512K is located between the connecting seat 512E and the support rod 512A.

[0039] In the second configuration, the connecting seat 512B and the connecting seat 512E are injection molded onto the outer wall of the support sleeve 512F. The support sleeve 512F completely penetrates the connecting seat 512B and the connecting seat 512E. The support sleeve 512F is provided with ventilation holes that correspond to the second inner through hole 512H and the third inner through hole 512I and communicate with the first inner through hole 512G. The first bearing 512J and the second bearing 512K are installed between the support sleeve 512F and the support rod 512A.

[0040] A first cover plate 514 is slidably mounted on the support tube 511. The diameter of the first cover plate 514 is larger than the first connecting hole between the fourth cavity D and the fifth cavity E. An air collecting hood 515 that can cover the first cover plate 514 is installed at the upper end of the support tube 511. A sleeve portion 514A that can extend into the air collecting hood 515 is provided at the upper end of the first cover plate 514. A pressure relief hole 51A is provided on the tube wall of the support tube 511 for passing airflow into the air collecting hood 515 to push the first cover plate 514 downward to cover the first connecting hole. A return spring 516 for lifting the first cover plate 514 to open the first connecting hole is also mounted on the support tube 511. By providing a sliding first cover plate 514 on the support pipe 511, when high-pressure gas is introduced into the support pipe 511, some of the gas will flow out from the pressure relief hole 51A into the air collecting hood 515, causing pressure to be generated in the air collecting hood 515 to push the first cover plate 514 downward to slide onto the first connecting hole, preventing the gas ejected from the jet hole 513 from flowing upward through the first connecting hole into the fifth chamber E, so that the backwash gas can flow out from the second one-way valve 15.

[0041] The support tube 511 is also equipped with an inner liner 517 located inside the first connecting hole and used to cooperate with the first cover plate 514 to seal the first connecting hole. The inner ring portion 517A of the inner liner 517 is fixedly connected to the support tube 511, and a sealing ring 518 is fitted on the outer ring portion 517B of the inner liner 517. At least two first connecting plates 517C are provided between the inner ring portion 517A and the outer ring portion 517B. The inner ring portion 517A is formed with a threaded hole, wherein the lower end of the support tube 511 and the upper end of the support rod 512A are both spirally connected to the threaded hole of the inner ring portion 517A.

[0042] The housing 1 is also equipped with a second one-way valve 15 located beside the filter barrel 4, which is used to quickly discharge gas when the rotary backflushing device 51 blows air. A silencer 16 is provided on the outside of the second one-way valve 15. The upper end of the silencer 16 is connected to the sixth chamber F. The first air outlet 102 of the housing 1 is located at the upper end of the silencer 16. A seventh chamber G is formed inside the silencer 16. The seventh chamber G is equipped with sound-absorbing cotton. After the airflow flows out from the first air outlet 102 of the sixth chamber F, it enters the silencer 16. The sound-absorbing cotton in the silencer 16 reduces the noise generated when the airflow flows out of the housing 1. The air valve 54 is a solenoid valve and has two switchable modes: timed air explosion and manual air explosion. The housing 1 is equipped with a selection switch 56 for switching between timed air explosion and manual air explosion. The housing 1 is equipped with a timer 57 for controlling the air valve 54 to generate air explosions at regular intervals, and a pulse meter 58 located beside the timer 57.

[0043] The cyclone device 3 includes a second air inlet 31 located at the center and corresponding to the second cavity B, several second air outlets 32 and dust discharge ports 33 disposed around the second air inlet 31 and facing upwards and downwards respectively, and several guide air channels 34 connected to the central second air inlet 31 and spirally coiled outwards around the second air outlets 32. The second air outlets 32 and dust discharge ports 33 are located in the first cavity A and the third cavity C respectively, and the dust discharge ports 33 are funnel-shaped. Multiple cyclone devices 3 are provided. A first mounting plate 14 is provided inside the housing 1 between the first cavity A and the second cavity B for mounting the cyclone devices 3. The first mounting plate 14 is installed at an angle so that the second air outlets 32 face the first one-way valve 19. The cyclone device 3 divides the interior of the casing 1 into a first chamber A, a second chamber B, and a third chamber C. When the airflow enters the casing 1 from the first air inlet 101, it first enters the second air inlet 31 of the cyclone device 3 from the second chamber B. Then, it flows outwards along several guide air channels 34 into the centrifugal chamber between the dust discharge port 33 and the second air outlet 32. When the airflow enters the funnel-shaped centrifugal chamber under the guidance of the spiral guide air channels 34, a spiral vortex is generated. This causes dust particles larger than 0.02 mm to fall from the dust discharge port 33 into the first dust collection box 6 at the bottom of the third chamber C under the action of centrifugal force. Meanwhile, the gas enters the first chamber A through the second air outlet 32 ​​under the suction of the fan 2, thereby achieving centrifugal separation and filtration of the air.

[0044] By tilting the cyclone device 3 inside the housing 1 and positioning the second air outlet 32 ​​towards the first one-way valve 19, the airflow passes through the first one-way valve 19 and enters the fourth chamber D, located around the filter cartridge 4, which is vertically installed inside the housing 1. By tilting the cyclone device 3 inside the housing 1, the second air outlet 32 ​​of the cyclone device 3 can be tilted towards the first one-way valve 19 on one side of the filter cartridge 4. This allows the air flowing from the cyclone device 3 to quickly pass through the first one-way valve 19 from the outside of the filter cartridge 4 into the filter cartridge 4, while also ensuring that the suction force generated by the fan 2 is smoothly transmitted to the cyclone device 3. Of course, this cyclone device 3 uses a micro-cyclone device, capable of filtering finer dust particles.

[0045] The first air inlet 101 is provided with a first filter screen 8 for filtering large particles. The first filter screen 8 is located between the first air inlet 101 and the second cavity B, and the first air inlet 101 is provided with an inlet cavity 10 for receiving large particulate matter. The first filter screen 8 intercepts large particles such as debris in the air, thus achieving the first layer of filtration.

[0046] The chassis 1 includes an upper chassis 11 and a lower chassis 12. The fan 2 and the self-cleaning module 5 are located in the upper chassis 11, and the cyclone device 3 and the filter barrel 4 are located in the lower chassis 12. The first dust collection box 6 and the second dust collection box 7 are symmetrically installed at the bottom of the lower chassis 12 and can be pulled out to the sides respectively. An inner shell 13 is installed in the upper chassis 11, covering the filter barrel 4 and forming a fifth cavity E. The fan 2 is installed on the inner shell 13, and one end of the self-cleaning module 5 extends through the inner shell 13 into the filter barrel 4. The filter cartridge 4 is a HEPA filter cartridge. Its upper outlet connects to the fifth chamber E. The rotating backflushing device 51 of the self-cleaning module 5 extends into the filter cartridge 4 from its upper outlet. Air flowing out through the second outlet 32 ​​of the cyclone device 3 enters the first chamber A, then passes through the first one-way valve 19 and enters the fourth chamber D. It then enters the filter cartridge 4 from its periphery, achieving a third filtration. Dust is intercepted and deposited on the outer sidewall of the filter cartridge 4. When the self-cleaning module 5 injects high-pressure airflow into the filter cartridge 4, it blows the dust deposited on the outer wall of the filter cartridge 4 into the second dust collection box 7 at the bottom of the second chamber B, thus achieving self-cleaning of the filter cartridge 4. The fan 2 uses a permanent magnet brushless DC motor, resulting in higher efficiency and energy savings.

[0047] The rear end face of the upper housing 11 is provided with a pin hole 111 for installing a soundproof cover 16, and the soundproof cover 16 is provided with a pin block 161 that matches the pin hole 111 and can be inserted and fastened. There are two pin holes 111 and two pin blocks 161 respectively, located at both ends inside the soundproof cover 16. The soundproof cover 16 is also provided with a first handle 162 for easy lifting. The front end face of the lower housing 12 is provided with a visual panel 121 for observing the usage of the filter canister 4, and the lower end of the lower housing 12 is provided with a first buckle 122 and a second buckle 123 for fastening the first dust collection box 6 and the second dust collection box 7 respectively. There are at least two first buckles 122 and two buckles 123, which are respectively located on both sides of the first dust collection box 6 and the second dust collection box 7. The front end of the first dust collection box 6 is bent to form a flange 61. This flange 61 not only facilitates the installation of the first latch 122, but also facilitates the pulling out of the first dust collection box 6. The rear ends of the upper housing 11 and the lower housing 12 are hinged, and the upper housing 11 and the lower housing 12 are provided with a third latch 125 and a fourth latch 126 near the front end for closing and locking on both sides. The front end of the upper housing 11 is also provided with a second handle 110 for opening and closing.

[0048] In summary, this utility model has two working states: one is the air filtration section, and the other is the self-cleaning filter canister state. The specific working methods are as follows:

[0049] First, during air filtration, dust-laden air is drawn in through the first air inlet 101. After passing through the first filter screen 8 to intercept large objects and distribute the airflow evenly, the air enters the second chamber B. Further, four inclined cyclone devices 3 separate and filter finer particles. Dust particles larger than 0.01mm fall from the dust outlet 33 into the first dust collection box 6 of the third chamber C. The air, having undergone two layers of pre-filtration, enters the first chamber A through the second air outlet 32 ​​of the cyclone device 3, and then enters the fourth chamber D after passing through the first one-way valve 19. The fourth chamber D contains a HEPA filter canister 4 for fine filtration, and the filter canister 4 is equipped with cyclones... A sealed rotary backflushing device 51 is installed, and a second one-way valve 15 is installed behind the fourth chamber D to allow the backflushed gas to be discharged quickly. Of course, a HEPA filter can be added at the first air outlet 102 to meet the harsh environmental requirements. A second dust collection box 7 is installed below the fourth chamber D to collect the dust falling from the filter canister 4. Furthermore, the clean air that has undergone multiple filtrations enters the fifth chamber E through the rotary backflushing device 51. The fifth chamber E is directly connected to the negative pressure fan 2, which then blows the clean air into the sixth chamber F. After slow flow and noise reduction, the clean air enters the silencer hood 16 of the seventh chamber G, and finally the clean and low-noise air is discharged to achieve the purpose of filtration and noise reduction.

[0050] Secondly, during the self-cleaning feedback process, commonly used compressed air is connected to the oil-water separator 55 for filtration and then connected to the air storage cylinder 52. The other end of the air storage cylinder 52 is connected to a large-size air valve 54, which is controlled by an electromagnetic coil and can switch between timed and manual air explosion modes. When the air valve 54 is energized, it opens instantly, releasing the air in the air storage cylinder 52. The air is then flushed into the rotary backflushing device 51 through the connecting hose 53. Driven by pressure, the first cover plate 514 of the rotary backflushing device 51 presses down to seal the filter barrel 4, forming a sealed space. The compressed air generates positive pressure inside the filter barrel 4, which, together with the rotary backflushing device 51, thoroughly cleans the filter barrel 4, keeping it unobstructed for a long time, reducing the frequency of replacement, and saving costs and time.

[0051] Of course, the above description is only a specific embodiment of the present utility model and is not intended to limit the scope of the present utility model. All equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model should be included in the scope of the claims of the present utility model.

Claims

1. A novel self-cleaning air filtration device, characterized in that, include: The components include a chassis (1), a fan (2), a cyclone device (3), a filter barrel (4), a self-cleaning module (5), and a first dust collection box (6) and a second dust collection box (7) located below the cyclone device (3) and the filter barrel (4) for receiving filter residue. The cyclone device (3) divides the chassis (1) from top to bottom into a first cavity (A), a second cavity (B) and a third cavity (C), and the second cavity (B) in the middle of the cyclone device (3) corresponds to the first air inlet (101) of the chassis (1); The chassis (1) is also provided with a fourth chamber (D) and a sixth chamber (F) for accommodating the filter barrel (4) and the self-cleaning module (5) respectively. A fifth chamber (E) is provided between the fourth chamber (D) and the sixth chamber (F). The inlet and outlet of the fan (2) are located in the fifth chamber (E) and the sixth chamber (F) respectively. A first one-way valve (19) is provided between the first chamber (A) and the fourth chamber (D). The sixth chamber (F) is connected to the first air outlet (102) of the chassis (1).

2. The novel self-cleaning air filtration device according to claim 1, characterized in that: The self-cleaning module (5) includes a rotary backflushing device (51) located inside the filter barrel (4) and capable of rotation, an air tank (52) installed in the housing (1), a connecting hose (53) connecting the air tank (52) and the rotary backflushing device (51), an air valve (54) installed on the connecting hose (53), and an oil-water separator (55) installed on the connecting pipe between the air tank (52) and the external air source.

3. The novel self-cleaning air filtration device according to claim 2, characterized in that: The rotary backflushing device (51) includes a support pipe (511) with a connecting hose (53) extending into the filter barrel (4) and a rotary jet pipe frame (512) that is rotatably installed at the lower end of the support pipe (511) and can spray airflow to the side. The rotary jet pipe frame (512) is provided with at least two rows of vertically arranged jet holes (513).

4. The novel self-cleaning air filtration device according to claim 3, characterized in that: A first cover plate (514) is slidably mounted on the support tube (511). The diameter of the first cover plate (514) is larger than the first connecting hole between the fourth cavity (D) and the fifth cavity (E). An air collecting hood (515) that can cover the first cover plate (514) is installed on the upper end of the support tube (511). A sleeve part (514A) that can extend into the air collecting hood (515) is provided on the upper end of the first cover plate (514). A pressure relief hole (51A) is provided on the tube wall of the support tube (511) for passing airflow into the air collecting hood (515) to push the first cover plate (514) downward to cover the first connecting hole. A reset spring (516) for lifting the first cover plate (514) to open the first connecting hole is also mounted on the support tube (511).

5. A novel self-cleaning air filtration device according to claim 2, characterized in that: The chassis (1) is also provided with a second one-way valve (15) located next to the filter barrel (4) and used for rapid gas discharge when the rotary backflushing device (51) blows air. A silencer (16) is provided on the outside of the second one-way valve (15). The upper end of the silencer (16) is connected to the sixth cavity (F). The first air outlet (102) of the chassis (1) is located at the upper end of the silencer (16).

6. A novel self-cleaning air filtration device according to claim 2, characterized in that: The gas valve (54) is a solenoid valve and has two switchable modes: timed gas explosion and manual gas explosion. The chassis (1) is equipped with a selection switch (56) for switching between timed gas explosion and manual gas explosion. The chassis (1) is equipped with a timer (57) for controlling the gas valve (54) to generate gas explosions at regular intervals, and a pulse meter (58) located next to the timer (57).

7. A novel self-cleaning air filtration device according to any one of claims 1-6, characterized in that: The cyclone device (3) includes a second air inlet (31) located at the center and corresponding to the second cavity (B), several second air outlets (32) and dust outlets (33) arranged around the second air inlet (31) and facing upward and downward respectively, and several guide air channels (34) connected to the central second air inlet (31) and spirally coiled outward on the second air outlet (32). The second air outlet (32) and dust outlet (33) are located in the first cavity (A) and the third cavity (C) respectively, and the dust outlet (33) is funnel-shaped.

8. A novel self-cleaning air filtration device according to claim 7, characterized in that: The cyclone device (3) is provided in multiple ways. A first mounting plate (14) is provided in the housing (1) between the first cavity (A) and the second cavity (B) for mounting the cyclone device (3). The first mounting plate (14) is installed at an angle so that the second air outlet (32) faces the first one-way valve (19).

9. A novel self-cleaning air filtration device according to claim 7, characterized in that: The first air inlet (101) is provided with a first filter screen (8) for filtering large particles. The first filter screen (8) is located between the first air inlet (101) and the second cavity (B). The first air inlet (101) is provided with an inlet cavity (10) for accommodating large particles.

10. A novel self-cleaning air filtration device according to any one of claims 1-6, characterized in that: The chassis (1) includes an upper chassis (11) and a lower chassis (12). The fan (2) and the self-cleaning module (5) are located in the upper chassis (11), the cyclone device (3) and the filter barrel (4) are located in the lower chassis (12), the first dust collection box (6) and the second dust collection box (7) are symmetrically installed at the bottom of the lower chassis (12) and can be pulled out to the sides respectively. An inner shell (13) is installed in the upper chassis (11) and covers the filter barrel (4) to form a fifth cavity (E). The fan (2) is installed on the inner shell (13), and one end of the self-cleaning module (5) extends through the inner shell (13) into the filter barrel (4).

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