A system for preventing backflow and ash spillage

Abstract

This invention discloses an anti-backflow dust filter system, belonging to the technical field of anti-dust-flow systems. It includes a frame, an anti-backflow dust filter plate, a flip-top assembly, a negative pressure suction hood, a blower assembly, and a pneumatic positioning device. The inner side of the frame is integrally formed with an inner edge; one end of the frame is integrally formed with a flange, which is fixed to the air inlet inside the dust collector; the anti-backflow dust filter plate is movably engaged with the inner side of the frame and tightly fitted with the inner edge, and the anti-backflow dust filter plate is fastened to the inner edge with bolts; multiple rows of filter holes are spaced apart on the anti-backflow dust filter plate; the flip-top assembly includes a shaft rotatably disposed inside the frame and positioned above each row of filter holes, with a cover plate integrally formed on the shaft, the cover plate being movably fitted with the filter holes; the anti-backflow dust filter system of this invention uses a blower method to clean the filter bags, and during the cleaning process, it avoids dust backflow and contamination of the space surrounding the dust collector.

Description

Technical Field

[0001] This invention specifically relates to an anti-backflow ash netting system, belonging to the technical field of anti-ash-running systems. Background Technology

[0002] In industrial production processes, the emission of dust-laden exhaust gas is one of the main sources of air pollution. Therefore, dust removal treatment is necessary before exhaust gas is emitted. Baghouse dust collectors are widely used for treating exhaust gas containing industrial dust due to their high dust removal efficiency and stable operation. After a period of operation, a layer of dust accumulates on the outside of the filter bags, affecting the dust removal and filtration effect. Therefore, it is necessary to remove the dust from the surface of the filter bags. Currently, there are two main cleaning methods for baghouse dust collectors: vibration cleaning and reverse-air cleaning. Vibration cleaning uses a vibration device to vibrate the filter bags to achieve the purpose of cleaning, but this method has a relatively poor cleaning effect and can cause some damage to the filter bags. Mechanical damage; reverse-blowing cleaning uses compressed gas to blow the filter bag in the reverse direction, causing dust to fall off the surface of the filter bag, such as the automatic cleaning device and automatic cleaning control method disclosed in Chinese Patent Publication No. CN120204822A. This cleaning method causes little damage to the filter bag, does not require a reverse blower or compressed air source, and can perform cleaning operations simultaneously in gas dust removal, improving the operating efficiency of dust removal equipment; however, this mechanical cleaning structure is prone to damaging the filter bag. In addition, during the existing reverse-blowing cleaning, some dust will be sprayed back into the collection air inlet direction when the filter bag is being blown by compressed air, resulting in intermittent dust spraying at the dust collection point and polluting the surrounding space. Summary of the Invention

[0003] To address the aforementioned issues, this invention proposes an anti-backflow dust cleaning system that uses a jet cleaning method to clean the filter bags, while preventing dust from backflowing and contaminating the space around the dust collector during the cleaning process.

[0004] The anti-backflow ash netting system of the present invention includes:

[0005] The frame has an inner edge integrally formed on its inner side; a flange is integrally formed on the outer side of one end of the frame, and the flange is fixed to the air inlet inside the dust collector.

[0006] The anti-backflow ash-spraying mesh plate is movably engaged inside the frame and tightly fitted to the inner edge. The anti-backflow ash-spraying mesh plate is fastened to the inner edge by bolts. Multiple rows of filter holes are spaced apart on the anti-backflow ash-spraying mesh plate.

[0007] A flip-top assembly includes a shaft rotatably mounted inside a frame and positioned above each row of filter holes. A cover plate is integrally formed on the shaft, and the cover plate is movably fitted with the filter holes. A suction seat is fixed to the side of the shaft inside the frame, and magnetic suction elements are provided on the suction seat and the cover plate to attract each other. A flip-top lever is fixed to the front end of the cover plate.

[0008] A negative pressure suction hood is provided, wherein straight grooves are provided on both sides of the frame, and a sealing frame strip is fixed inside the straight grooves; the negative pressure suction hood includes a hood body, and a suction nozzle is integrally formed at the front end of the hood body, the suction nozzle being fitted into the sealing frame strip; the suction nozzle is located at the air inlet end of the anti-backflow ash-spraying mesh plate; the suction nozzle is installed at an angle of 30°-60° to the anti-backflow ash-spraying mesh plate; two hood bodies are connected by a first transition pipe;

[0009] A jetting pipe assembly, one end of which is connected to a jetting air source and the other end of which is connected to a nozzle; a Venturi jetting device is connected in series on the jetting pipe assembly; the negative pressure end of the Venturi jetting device is connected to a first transition pipe.

[0010] A pneumatic positioning device, which is connected to the blowpipe assembly.

[0011] In use, the frame is fixed to the air inlet inside the dust collector, and the air inlet is covered by the anti-backflow dust-spraying mesh plate. When the exhaust gas carrying dust particles is drawn to the anti-backflow dust-spraying mesh plate, it enters the dust collector through the filter holes of the mesh plate. After being filtered by the dust collector, the dust particles are trapped by the filter bags, and the gas is discharged from the dust collector. During the process of the gas entering the dust collector, the air pressure drives the flip-top assembly to flip. Specifically, as the air pressure enters the dust collector, it contacts each cover plate. The cover plate is affected by the air pressure, and the shaft rotates along the inner side of the frame. When the cover plate rotates 90°, it is limited by the suction seat. At this time, the suction seat and the cover plate are attracted by the magnetic attraction, thus not consuming the filtration pressure of the dust collector. When the dust collector stops dust collection, the cover plate is still in the flipped-up state due to the action of the magnetic attraction. When the filter bags are being cleaned, the jet air source enters the jet pipe assembly, and then sequentially passes through... After passing through the Venturi jet injector and pneumatic dropper, the gas enters the nozzle, where high-pressure gas impacts the filter bag, causing dust to fall off and achieving dust removal. When the high-pressure gas passes through the pneumatic dropper, it impacts the top cover downwards, causing the suction seat and cover to detach, and the cover to swing down. Simultaneously, the cover-closing swing rod on the cover impacts the next layer of cover, causing the next layer of cover to detach from the suction seat and swing down. After this swinging down is completed, the anti-backflow dust-spraying screen is completely sealed. When the gas passes through the Venturi jet injector, the negative pressure end of the injector provides negative pressure to the first transition pipe. The first transition pipe provides negative pressure to the inside of the frame through the negative pressure suction hood. Since the suction nozzle of the hood faces the air inlet of the anti-backflow dust-spraying screen, it can provide suction to the air inlet side of the screen, absorbing the dust generated during the cover closing process and the dust removal process.

[0012] Furthermore, the jetting pipe assembly includes a Venturi jet fixed to the top and bottom surfaces of the frame. The negative pressure end of the Venturi jet is connected to the first transition pipe via a tee. The input end of the Venturi jet is connected via a second transition pipe, and the output end of the Venturi jet is connected via a third transition pipe. A jetting inlet pipe is provided in the middle of the second transition pipe, and a jetting outlet pipe is provided in the middle of the third transition pipe. The jetting inlet pipe is connected to a jetting air source, and the jetting outlet pipe is connected to a nozzle.

[0013] The compressed air source enters the injection inlet pipe, the high-pressure gas enters the third transition pipe, and then the high-pressure gas flows rapidly through the second transition pipe, the Venturi jet injector and the third transition pipe, and finally enters the injection outlet pipe. When the high-pressure gas flows through the Venturi jet injector, the negative pressure end provides negative pressure to the first transition pipe through the three-way valve, and the first transition pipe provides suction to the air inlet side of the anti-backflow ash-running mesh plate through the negative pressure suction hood.

[0014] Furthermore, the pneumatic positioning device includes a tube seat body connected in series to the output side of the Venturi jet, and a flap body is hinged to the inner side of the tube seat body via a hinge seat; a limiting platform that fits against the flap body is fixed to the top of the inner side of the tube seat body, and the limiting platform on the inner side of the tube seat body can prevent the flap body from flipping over after resetting; a first flange tube is fixedly connected to the bottom of the tube seat body, and a second flange tube is fitted and fixed to the top of the frame body; the first flange tube and the second flange tube are fixed by bolts; an elastic cover is fixed to the outside of the second flange tube; a trigger rod is slidably arranged at the axis of the first flange tube and the second flange tube via a bearing; when the cover plate is attracted to the magnetic suction component, a gap of 2-5mm is provided between the top surface of the cover plate and the elastic cover.

[0015] When the pneumatic positioning device is in use, compressed air enters the tube seat body after passing through the Venturi jet. The compressed air impacts the flap body, causing it to flip along the hinge seat towards the nozzle side and swing downwards. The first and second flanges form a support system for the tube seat body, and the elastic cover allows the tube seat body, the first flange, and the second flange to form a sealed connecting pipe assembly. Inside the first and second flanges, a trigger rod is slidably installed via bearings. When the flap body is impacted by compressed air, it drives the trigger rod downwards. As the trigger rod descends, it drives the bottom of the elastic cover to descend synchronously, causing the elastic cover to directly press against the top surface of the cover plate. The bottom of the elastic cover triggers the cover plate to disengage from the magnetic suction component. At this time, the cover plate can swing downwards, achieving the sealing of the anti-backflow dust mesh plate. This prevents dust from backflowing during the dust removal process. After the dust removal is completed, the cover plate and the flap body reset, restoring a 2-5mm gap between the top surface of the cover plate and the elastic cover.

[0016] Furthermore, the flap body is hinged above the first flange pipe, and the flap body and the limiting platform are magnetically connected; a reset rod is fixed inside the elastic cover, and the reset rod extends into the inner side of the pipe seat body.

[0017] When the dust removal process begins, the flapping plate and the limiting platform are in a magnetically engaged state. At this time, the air inlet pipe is cut off, preventing high-pressure gas from reaching the nozzle. The high-pressure gas enters the elastic cover through the pipe seat, causing the elastic cover to tilt downwards and triggering the top cover of the flap assembly to flip down. The cover seals the anti-backflow dust-spraying mesh. As the high-pressure gas continues to impact the flapping plate, it overcomes the magnetic attraction and detaches from the limiting platform, flipping down. The air inlet pipe's flow space is then opened, allowing compressed air to enter the nozzle. The filter bags of the dust collector are cleaned; this ensures that the anti-backflow dust filter is closed before the compressed air comes into contact with the filter bags, preventing dust from backflowing; after the filter bags are cleaned, the compressed air is turned off, and the dust collection state is restarted. The dust-laden gas impacts the cover plate, and the cover plate drives the elastic cover to the top. When the flip plate body approaches the limiting table, it is attracted by the magnetic attraction of the limiting table and automatically elastically attracts the flip plate body and the limiting table. When the cover plate flips up 90°, the cover plate can attract each other with the suction seat without consuming the pressure of the dust-laden gas.

[0018] Furthermore, the bearings are provided in two sets, which are respectively fixed to the top of the inner side of the first flange tube and the bottom of the inner side of the second flange tube; the trigger rod slides through the two sets of bearings; the trigger rod has a force-bearing plate integrally formed at the bottom of the upper bearing; a spring body is sleeved between the trigger rod and the lower bearing; the top of the trigger rod extends 1-1.2mm into the inner side of the tube seat; the bottom of the trigger rod fits against the bottom of the inner side of the elastic cover.

[0019] Under normal conditions, due to the action of the spring body, the spring body moves upward through the force plate, causing the trigger rod to be in a high position. At this time, the bottom of the trigger rod disengages from the top cover plate of the trigger flip-top assembly. When compressed air enters the pneumatic positioning device, the compressed air impacts the flip plate body, causing the flip plate body to continuously flip downward. The flip plate body presses down on the trigger rod, and the trigger rod presses down on the spring body through the force plate. The spring body is compressed, and the section of the trigger rod protruding from the tube seat body is pressed against the first flange tube. At this time, the trigger rod triggers the top cover plate of the flip-top assembly to flip downward. The cover plate can seal the anti-backflow dust mesh plate. After dust removal is completed, the compressed air is turned off, and the dust removal state is restarted. After the cover plate loses pressure, the spring body pushes the trigger rod upward through the force plate. At this time, the trigger rod disengages from the top cover plate of the trigger flip-top assembly. The dust-laden gas impacts the cover plate, and when the cover plate flips up 90°, the cover plate can attract each other with the suction seat without consuming the pressure of the dust-laden gas.

[0020] Furthermore, a magnetic attraction element is provided between the limiting platform and the flip plate body; a connecting plate is hinged between the trigger rod and the flip plate body.

[0021] The flap body can swing hingedly along the hinge seat. When compressed air enters the pneumatic lowering device, the compressed air impacts the flap body, causing it to instantly detach from the magnetic suction component. The flap body continues to flip downwards, and the flap body drives the trigger rod downwards via the connecting plate. At this time, the trigger rod triggers the top cover plate of the flip cover assembly to flip downwards. The cover plate can seal the anti-backflow dust mesh plate. After dust removal is completed, the compressed air is turned off, and the dust removal state is restarted. The dust-laden gas impacts the cover plate, and the cover plate drives the trigger rod upwards. The trigger rod drives the flap to flip upwards via two hinged connecting plates. When the flap approaches the magnetic suction component, it is attracted by the magnetic suction component and directly engages with the magnetic suction component of the limiting platform. At the moment of engagement, the trigger rod can be pulled upwards again, causing the trigger rod to detach from the top cover plate of the flip cover assembly. When the cover plate flips 90°, it can engage with the suction seat without consuming the pressure of the dust-laden gas.

[0022] Furthermore, the elastic cover is a spring tube or a tubular air bladder; the air bladder or spring tube can seal the bottom of the second flange tube to prevent compressed air from leaking out of the second flange tube, while utilizing the contractility of the spring tube and the elasticity of the air bladder to facilitate the free raising and lowering of the trigger rod.

[0023] Furthermore, the pulse-jet air source includes an air tank, which is connected to the pulse-jet inlet pipe via a pulse valve; the nozzle is positioned directly inside the filter bags within the dust collector; compressed air is injected from the air tank through the pulse valve and into each filter bag via the nozzle on the pulse-jet inlet pipe. Due to the acceleration generated by expansion and the action of the reverse airflow, the dust adhering to the outer surface of the filter bag detaches from the filter bag and falls into the ash hopper, and is discharged via the ash conveying device; after the pulse-jet cleaning is completed, the filter bag returns to its filtering state.

[0024] Furthermore, the cover plate has a sealing groove that fits into the filter holes on the side near the anti-backflow dust mesh plate; a sealing frame is provided outside the sealing groove; by tightly fitting the sealing frame into the anti-backflow dust mesh plate, the sealing groove can cover the area around the filter holes, thereby sealing the filter holes and preventing dust from backflowing into them.

[0025] Furthermore, the filter holes protrude into the dust collector, and the diameter of the filter holes on the side closer to the dust collector is larger than the diameter on the side farther away from the dust collector. When the dust collector's fan continuously sends dust-laden gas into the dust collector, the dust particles in the gas smoothly pass through the filter holes of the anti-backflow dust-running screen plate. When the fan stops running, because the diameter of the filter holes on the side closer to the dust collector is larger than the diameter on the side farther away from the dust collector, the dust particles entering the dust collector are restricted by the inwardly protruding and narrowed filter holes, preventing the dust particles from returning to the dust inlet. In particular, when the thickness of the dust collector filter bag reaches a certain level and a pressure state occurs inside the dust collector, when the fan stops running and the air pressure inside the dust collector backflows towards the dust inlet, the filter holes can intercept the dust particles, preventing a large amount of dust from entering the dust inlet.

[0026] Furthermore, a filter screen is provided at the inlet of the suction nozzle, and the pore size of the filter screen is smaller than the inner diameter of the nozzle; the filter screen filters the dust particles that are larger than the inner diameter of the suction nozzle and prevents them from entering the suction nozzle, thereby ensuring the smooth blowing of the nozzle.

[0027] Compared with existing technologies, the anti-backflow dust net system of the present invention uses a jet-blowing method to clean the filter bags, avoiding damage caused by mechanical scratching. During the dust removal process, the filter bags can automatically seal the dust inlet, and a negative pressure is always provided on the outside of the sealing surface during the sealing process. This can remove dust brought into the pipeline during the closing process of the flip-top assembly. At the same time, the pressure difference between the inside and outside of the flip-top body is strengthened, which can improve the tightness of the flip-top assembly's closure and absorb the dust that escapes from the flip-top body during the dust removal process. This ensures that no dust enters the suction port during the entire dust removal process, preventing dust backflow and contamination of the space around the suction port. Furthermore, the flip-top assembly can automatically switch module modes during the switching between dust removal and dust removal processes. No electrical control components are required, making the operation safer and more stable. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the frame and anti-backflow ash mesh plate installation structure of the present invention.

[0029] Figure 2 This is a schematic diagram of the installation structure of the frame, anti-backflow mesh plate, and flip-top assembly of the present invention.

[0030] Figure 3 This is a schematic diagram of the structure of Embodiment 1 of the anti-backflow ash netting system of the present invention.

[0031] Figure 4 This is a schematic diagram of the overall structure of the negative pressure suction cup of the present invention.

[0032] Figure 5 This is a schematic diagram of the overall structure of Embodiment 1 of the pneumatic positioning device of the present invention.

[0033] Figure 6 This is a schematic diagram of the overall structure of Embodiment 2 of the pneumatic positioning device of the present invention.

[0034] Figure 7 This is a schematic diagram of the internal components of the pneumatic positioning device of the present invention.

[0035] Figure 8 This is a schematic diagram of the overall structure of Embodiment 3 of the pneumatic positioning device of the present invention.

[0036] Reference numerals: 1. Frame, 2. Inner edge, 3. Flange, 4. Anti-backflow dust mesh, 5. Filter hole, 6. Shaft, 7. Cover plate, 8. Suction seat, 9. Cover swing rod, 10. Negative pressure suction hood, 11. Sealing frame strip, 12. Cover body, 13. Suction nozzle, 14. First transition pipe, 15. Venturi jet, 16. Second transition pipe, 17. Third transition pipe, 18. Inlet pipe, 19. Outlet pipe, 20. Pipe seat, 21. Flip plate, 22. First flange pipe, 23. Second flange pipe, 24. Elastic cover, 25. Bearing, 26. Trigger rod, 27. Limiting platform, 28. Reset rod, 29. Force plate, 30. Spring body, 31. Connecting plate. Detailed Implementation

[0037] Example 1:

[0038] like Figures 1 to 5 The anti-backflow ash netting system shown includes:

[0039] The frame 1 has an inner edge 2 integrally formed on its inner side; a flange 3 is integrally formed on the outer side of one end of the frame 1, and the flange 3 is fixed to the air inlet inside the dust collector.

[0040] The anti-backflow ash-spraying mesh plate 4 is movably engaged inside the frame 1 and tightly fitted with the inner edge 2. The anti-backflow ash-spraying mesh plate 4 and the inner edge 2 are fastened with bolts. Multiple rows of filter holes 5 are spaced apart on the anti-backflow ash-spraying mesh plate 4.

[0041] A flip-top assembly includes a shaft 6 rotatably mounted inside a frame 1 and positioned above each row of filter holes 5. A cover plate 7 is integrally formed on the shaft 6, and the cover plate 7 is movably fitted with the filter holes 5. A suction seat 8 is fixed to the side of the shaft 6 on the inner side of the frame 1. Magnetic suction elements are provided on the suction seat 8 and the cover plate 7 to attract each other. A cover-opening lever 9 is fixed to the front end of the cover plate 7.

[0042] The negative pressure suction hood 10 has straight grooves on both sides of the frame 1, and a sealing frame strip 11 is fixed inside the straight grooves. The negative pressure suction hood 10 includes a hood body 12, and a suction nozzle 13 is integrally formed at the front end of the hood body 12. The suction nozzle 13 is fitted with the sealing frame strip 11. The suction nozzle 13 is set at the air inlet end of the anti-backflow ash-spraying mesh plate 4. The suction nozzle 13 is installed at an angle of 30°-60° to the anti-backflow ash-spraying mesh plate 4. The two hood bodies 12 are connected by a first transition pipe 14.

[0043] A jetting pipe assembly, one end of which is connected to a jetting air source and the other end of which is connected to a nozzle; a Venturi jet 15 is connected in series on the jetting pipe assembly; the negative pressure end of the Venturi jet 15 is connected to the first transition pipe 14.

[0044] A pneumatic positioning device, which is connected to the blowpipe assembly.

[0045] In use, the frame 1 is fixed to the air inlet inside the dust collector, and the air inlet is covered by the anti-backflow dust-spraying mesh plate 4. When the exhaust gas carrying dust particles is drawn to the anti-backflow dust-spraying mesh plate 4, it enters the dust collector through the filter holes 5 of the anti-backflow dust-spraying mesh plate 4. After being removed by the dust collector, the dust particles are trapped by the filter bags, and the gas is discharged from the dust collector. During the process of the gas entering the dust collector, the air pressure drives the flip-top assembly to flip. Specifically, during the process of air pressure entering the dust collector... When each cover plate 7 contacts the other cover plate, the cover plate 7 is affected by air pressure, and the shaft 6 rotates along the inner side of the frame 1. After the cover plate 7 rotates 90°, it is limited by the suction seat 8. At this time, the suction seat 8 and the cover plate 7 are attracted by the magnetic attraction, so as not to consume the filtration pressure of the dust collector. When the dust collector stops dust collection, the cover plate 7 is still in the upward state due to the action of the magnetic attraction. When the filter bag is being cleaned, the jet air source enters the jet pipe group, and then passes through the Venturi jet 15 and the pneumatic dropper in sequence, and then enters the nozzle. The high-pressure gas is impacted on the filter bag through the nozzle, causing the dust on the filter bag to fall off, thus achieving dust removal. When the high-pressure gas passes through the pneumatic dropper, the pneumatic dropper impacts the top cover plate 7 downward, causing the suction seat 8 and the cover plate 7 to separate, and the cover plate 7 swings down. At the same time, the cover-closing swing rod 9 on the cover plate 7 impacts the next layer of cover plate 7, causing the next layer of cover plate 7 to separate from the suction seat 8 and swing down. After the swinging is completed in sequence, it can achieve the following: The anti-backflow dust-spraying mesh plate 4 is completely sealed; when the gas passes through the Venturi jet 15, the negative pressure end of the Venturi jet 15 provides negative pressure to the first transition pipe 14; the first transition pipe 14 provides negative pressure to the inside of the frame 1 through the negative pressure suction hood 10. Since the suction nozzle 13 of the hood 12 is facing the air inlet end of the anti-backflow dust-spraying mesh plate 4, it can provide suction to the air inlet side of the anti-backflow dust-spraying mesh plate 4, and can absorb the dust generated during the closing process of the cover plate 7 and the dust removal process.

[0046] The jetting pipe assembly includes a Venturi jet 15 fixed to the top and bottom surfaces of the frame 1. The negative pressure end of the Venturi jet 15 is connected to the first transition pipe 14 via a tee. The input end of the Venturi jet 15 is connected via a second transition pipe 16, and the output end of the Venturi jet 15 is connected via a third transition pipe 17. A jetting air inlet pipe 18 is provided in the middle of the second transition pipe 16, and a jetting air outlet pipe 19 is provided in the middle of the third transition pipe 17. The jetting air inlet pipe 18 is connected to a jetting air source, and the jetting air outlet pipe 19 is connected to a nozzle.

[0047] The compressed air source enters the injection inlet pipe 18, and the high-pressure gas enters the third transition pipe 17. Then, the high-pressure gas flows rapidly through the second transition pipe 16, the Venturi jet injector 15 and the third transition pipe 17, and finally enters the injection outlet pipe 19. When the high-pressure gas flows through the Venturi jet injector 15, the negative pressure end provides negative pressure to the first transition pipe 14 through the three-way valve. The first transition pipe 14 provides suction to the air inlet side of the anti-backflow ash-spraying mesh plate 4 through the negative pressure suction hood 10.

[0048] The pneumatic positioning device includes a tube seat 20 connected in series to the output side of the Venturi jet 15. A flap body 21 is hinged to the inner side of the tube seat 20 via a hinge seat. A limiting platform 27 that fits against the flap body 21 is fixed to the top of the inner side of the tube seat 20. The limiting platform 27 on the inner side of the tube seat 20 can prevent the flap body 21 from flipping after resetting. A first flange tube 22 is fixedly connected to the bottom of the tube seat 20, and a second flange tube 23 is fitted and fixed to the top of the frame 1. The first flange tube 22 and the second flange tube 23 are fixed by bolts. An elastic cover 24 is fixed to the outside of the second flange tube 23. A trigger rod 26 is slidably arranged at the axis of the first flange tube 22 and the second flange tube 23 via a bearing. When the cover plate 7 is attracted to the magnetic attractant, a gap of 2-5mm is provided between the top surface of the cover plate 7 and the elastic cover 24.

[0049] When the pneumatic positioning device is in use, compressed air enters the tube seat 20 after passing through the Venturi jet 15. The compressed air impacts the flap body 21, causing the flap body 21 to flip along the hinge seat towards the nozzle side and swing downwards. The first flange tube 22 and the second flange tube 23 form a support system for the tube seat 20, and the elastic cover 24 enables the tube seat 20, the first flange tube 22 and the second flange tube 23 to form a sealed and connected pipe assembly. The trigger rod is slidably installed inside the first flange tube 22 and the second flange tube 23 through the bearing 25. 26; When the flap body 21 is impacted by compressed air, it drives the trigger rod 26 to press down; when the trigger rod 26 moves down, it drives the bottom of the elastic cover 24 to move down synchronously, so that the elastic cover 24 directly presses against the top surface of the cover plate 7, and the bottom of the elastic cover 24 triggers the cover plate 7 to disengage from the magnetic suction component; at this time, the cover plate 7 can swing down to achieve the sealing of the anti-backflow dust mesh plate 4; it can prevent dust from backflowing during the dust cleaning process; after the dust cleaning is completed, the cover plate 7 and the flap body 21 are reset, so that the gap between the top surface of the cover plate 7 and the elastic cover 24 is restored to 2-5mm.

[0050] The flap body 21 is hinged above the first flange pipe 22, and the flap body 21 and the limiting platform 27 are magnetically connected; a reset rod 28 is fixed inside the elastic cover 24, and the reset rod 28 extends to the inside of the pipe seat body 20.

[0051] When entering the dust removal process, since the flap body 21 and the limiting platform 27 are in the suction state, the blow-in air pipe 18 is cut off, and the high-pressure gas cannot reach the nozzle. The high-pressure gas enters the elastic cover 24 through the pipe seat 20. The elastic cover 24 pushes down, triggering the cover plate 7 on the top of the flap assembly to flip down. The cover plate 7 can seal the anti-backflow dust mesh plate 4. As the high-pressure gas continues to impact the flap body 21, the flap body 21 overcomes the magnetic attraction and flips down from the limiting platform 27. The flow space of the blow-in air pipe 18 is opened, and compressed air enters. The nozzle cleans the filter bags of the dust collector; thus, the anti-backflow dust mesh plate 4 is pre-closed before the compressed air comes into contact with the filter bags to prevent dust from backflowing; after the filter bags are cleaned, the compressed air is turned off and the dust collection state is restarted. The dust-laden gas impacts the cover plate 7, and the cover plate 7 drives the elastic cover 24 to rise. When the flip plate 21 approaches the limiting platform 27, it is attracted by the magnetic attraction of the limiting platform 27 and automatically elastically attracts the flip plate 21 and the limiting platform 27. When the cover plate 7 flips up 90°, the cover plate 7 can attract each other with the suction seat 8 without consuming the pressure of the dust-laden gas.

[0052] Example 2:

[0053] like Figure 6 and Figure 7 The anti-backflow ash netting system shown has two sets of bearings 25, which are fixed to the top inside the first flange pipe 22 and the bottom inside the second flange pipe 23, respectively. The trigger rod 26 slides through the two sets of bearings 25. The trigger rod 26 has a force-bearing plate 29 integrally formed at the bottom of the upper bearing 25. A spring body 30 is sleeved on the outside of the trigger rod 26, and the spring body 30 is located between the force-bearing plate 29 and the lower bearing 25. The top of the trigger rod 26 extends 1-1.2 mm into the inner side of the pipe seat body 20. The bottom of the trigger rod 26 is in contact with the bottom inside of the elastic cover 24.

[0054] Under normal conditions, due to the action of the spring body 30, the spring body 30 moves upward through the force plate 29, causing the trigger rod 26 to be in a high position. At this time, the bottom of the trigger rod 26 is disengaged from the cover plate 7 at the top of the trigger flip-top assembly. When compressed air enters the pneumatic lowering device, the compressed air impacts the flip plate 21, causing the flip plate 21 to continuously flip downward. The flip plate 21 presses down on the trigger rod 26, and the trigger rod 26 presses down on the spring body 30 through the force plate 29. The spring body 30 is compressed, and the section of the trigger rod 26 protruding from the pipe seat 20 is pressed against the first flange. Pipe 22, at this time, trigger rod 26 triggers the top cover plate 7 of the flip cover assembly to flip down; cover plate 7 can seal the anti-backflow dust mesh plate 4. After dust removal is completed, the compressed air is turned off and the dust removal state is re-entered. After cover plate 7 loses pressure, spring body 30 pushes trigger rod 26 up through force plate 29. At this time, trigger rod 26 disengages from trigger cover plate 7 at the top of the flip cover assembly. Dust-laden gas impacts cover plate 7. When cover plate 7 flips up 90°, cover plate 7 can attract each other with suction seat 8 without consuming the pressure of dust-laden gas.

[0055] Example 3:

[0056] like Figure 8 The anti-backflow ash netting system shown has a magnetic suction device between the limiting platform 27 and the flip plate body 21; and a connecting plate 31 is hinged between the trigger rod 26 and the flip plate body 21.

[0057] The flap body 21 can swing hingedly along the hinge seat. When compressed air enters the pneumatic lowering device, the compressed air impacts the flap body 21, causing it to instantly detach from the magnetic suction component. The flap body 21 continues to flip downwards, and the flap body 21 drives the trigger rod 26 downwards via the connecting plate 31. At this time, the trigger rod 26 triggers the cover plate 7 on the top of the flip cover assembly to flip downwards. The cover plate 7 can seal the anti-backflow dust mesh plate 4. After dust removal is completed, the compressed air is turned off, and the dust removal state is restarted. The body impacts the cover plate 7, and the cover plate 7 drives the trigger rod 26 to rise. The trigger rod 26 drives the flip plate to flip up through two hinged connecting plates 31. When the flip plate approaches the magnetic suction component, it is attracted by the magnetic suction component and directly engages with the magnetic suction component of the limiting platform 27. At the moment of engagement, the trigger rod 26 can be pulled up again, so that the trigger rod 26 disengages from the cover plate 7 at the top of the trigger flip plate assembly. When the cover plate 7 flips up 90°, the cover plate 7 can engage with the suction seat 8 without consuming the pressure of the dust-containing gas.

[0058] The elastic cover 24 is a spring tube or a tubular air bladder; the air bladder or spring tube can seal the bottom of the second flange tube 23 to prevent compressed air from leaking out of the second flange tube 23. At the same time, the contractility of the spring tube and the elasticity of the air bladder make it convenient for the trigger rod 26 to move freely up and down.

[0059] The pulse-jet air source includes an air tank, which is connected to the pulse-jet inlet pipe 18 via a pulse valve. The nozzle is positioned directly inside the filter bags in the dust collector. Compressed air is injected from the air tank through the pulse valve and into each filter bag via the nozzle on the pulse-jet inlet pipe 18. Due to the acceleration generated by the expansion and the action of the reverse airflow, the dust adhering to the outer surface of the filter bag detaches from the filter bag and falls into the ash hopper, and is discharged through the ash conveying device. After the pulse-jet cleaning is completed, the filter bag returns to its filtering state.

[0060] The cover plate 7 is provided with a sealing groove that fits into the filter hole 5 on the side near the anti-backflow dust mesh plate 4; a sealing frame is provided outside the sealing groove; by the sealing frame being tightly fitted with the anti-backflow dust mesh plate 4, the sealing groove can cover the area around the filter hole 5, thereby sealing the filter hole 5 and preventing dust from backflowing into the filter hole 5.

[0061] The filter holes 5 protrude into the dust collector, and the diameter of the filter holes 5 on the side closer to the dust collector is larger than the diameter on the side farther away from the dust collector. When the dust collector's fan continuously sends dust-laden gas into the dust collector, the dust particles in the gas pass smoothly through the filter holes 5 of the anti-backflow dust-running mesh plate 4. When the fan stops running, because the diameter of the filter holes 5 on the side closer to the dust collector is larger than the diameter on the side farther away from the dust collector, the dust particles entering the dust collector are restricted by the inwardly protruding and narrowed filter holes 5, preventing the dust particles from returning to the dust inlet. In particular, when the thickness of the dust collector filter bag reaches a certain level and the dust collector is under pressure, when the fan stops running and the air pressure inside the dust collector backflows towards the dust inlet, the filter holes 5 can intercept the dust particles, preventing a large amount of dust from entering the dust inlet.

[0062] A filter screen is provided at the inlet of the suction nozzle 13. The aperture of the filter screen is smaller than the inner diameter of the nozzle. The filter screen filters the dust particles, preventing those larger than the inner diameter of the suction nozzle 13 from entering the suction nozzle 13, thereby ensuring smooth blowing from the nozzle.

[0063] The above embodiments are merely preferred embodiments of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present invention are included within the scope of the present invention.

Claims

1. A blowback prevention and dust removal net system, characterized in that: The utility model provides a dustproof device for dust collector, including: Frame, integral with inner edge on the inside of frame; The frame one end outside integral with flange body, the flange body is fixed to the air inlet in the dust collector inside; Anti -back -spray dust -removal net board, the anti -back -spray dust -removal net board is closely combined with the inner edge and is tightly combined with the inner edge, and the anti -back -spray dust -removal net board is fastened with the inner edge through bolt; Anti -back -spray dust -removal net board is equipped with multiple rows of filter holes at intervals on it; Flip assembly, the shaft body is rotatably arranged on the inside of frame and is arranged above each row of filter holes, the cover plate is integrally formed on the shaft body, and the cover plate is movably attached to the filter hole; The suction seat is fixed on the side of the shaft body on the inside of the frame, and the suction seat and the cover plate are provided with magnetic attraction elements that attract each other; The cover plate is fixed with a cover closing swing rod at the front end; Negative pressure suction cover, straight grooves are formed on both sides of the frame, and sealing frame strips are fixed on the inside of the straight grooves; The negative pressure suction cover includes a cover body, a suction nozzle is integrally formed at the front end of the cover body, and the suction nozzle is embedded with the sealing frame strip; The suction nozzle is arranged at the air inlet end of the anti -back -spray dust -removal net board; The suction nozzle and the anti -back -spray dust -removal net board are installed at an inclination angle of 30-60 degrees; Two cover bodies are connected through a first transition pipe; Blow pipe group, one end of the blow pipe group is connected to a blow gas source, and the other end is connected to a nozzle; A venturi jet is connected in series on the blow pipe group; The negative pressure end of the venturi jet is connected with the first transition pipe; Pneumatic positioner, the pneumatic positioner is connected with the blow pipe group; The pneumatic positioner includes a pipe seat body connected in series on the output side of the venturi jet, a flap body is hinged to the inside of the pipe seat body through a hinge seat; A limiting table that is attached to the flap body is fixed on the top of the inside of the pipe seat body; A first flange pipe is fixed in communication at the bottom of the pipe seat body, and a second flange pipe is embedded and fixed on the top of the frame; The first flange pipe and the second flange pipe are fixed by bolts; An elastic cover is fixed on the outside of the second flange pipe; A trigger rod is slidably arranged on the shaft center of the first flange pipe and the second flange pipe through bearings; The bearings are arranged in two groups and are fixed on the top of the inside of the first flange pipe and the bottom of the inside of the second flange pipe; The trigger rod slides through the two groups of bearings; A stress disc is integrally formed at the bottom of the upper bearing of the trigger rod; A spring body is sleeved between the stress disc and the lower bearing of the trigger rod, and the top of the trigger rod extends 1-1.2mm into the inside of the pipe seat body; The bottom of the trigger rod is attached to the inside of the bottom of the elastic cover; Magnetic attraction elements are arranged between the limiting table and the flap body; A connecting plate is hinged between the trigger rod and the flap body; When the cover plate and the suction seat are attracted, a gap of 2-5mm is provided between the top surface of the cover plate and the elastic cover; The elastic cover is a spring pipe or a tubular air bag.

2. The anti-backflash, run-off screen system of claim 1, wherein: The injection pipe group comprises a Venturi jet fixed to the top surface and the bottom surface of the frame, the negative pressure end of the Venturi jet is connected to the first transition pipe through a three-way joint, the input end of the Venturi jet is connected through the second transition pipe, the output end of the Venturi jet is connected through the third transition pipe, the middle part of the second transition pipe is provided with an injection air inlet pipe, the middle part of the third transition pipe is provided with an injection air outlet pipe, the injection air inlet pipe is connected to an injection air source, and the injection air outlet pipe is connected to a nozzle.

3. The anti-backflash, run-off screen system of claim 1, wherein: The injection air source comprises an air bag, the air bag is connected to the injection air inlet pipe through a pulse valve, and the nozzle is opposite to the filter bag in the dust remover.

4. The anti-backflash, run-off screen system of claim 1, wherein: The cover plate is provided with a closed groove matched with the filter hole on the side close to the anti-backflow dust removal net plate, and a sealing frame is arranged outside the closed groove.

5. The anti-backflash, run-off screen system of claim 1, wherein: The filter hole protrudes towards the inside of the dust remover, and the aperture of the filter hole close to the dust remover is larger than the aperture of the filter hole away from the dust remover.

6. The anti-backflash, run-off, and debris screen system of claim 1, wherein: A filter screen body is arranged at the inlet of the suction nozzle, and the aperture of the filter screen body is smaller than the inner diameter of the nozzle.

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