A purification tower for air pollution control

Abstract

This invention relates to a purification tower for air pollution control, comprising a tower body with an upper and lower gas collection hood installed at its upper and lower ends, respectively. Multiple filter cartridges are fixedly connected between the upper and lower gas collection hoods. A precision reverse filtration mechanism is installed within the tower body. This mechanism precisely clears localized blockages in the filter cartridges, ensuring their filtration efficiency and preventing a decrease in efficiency due to localized blockages. This allows the purification tower to maintain stable efficiency and effectiveness in controlling air pollution. Furthermore, the inclusion of driven and transmission components allows the precision reverse filtration mechanism to automatically change its position within the tower body, ensuring comprehensive detection and clearing of the filter cartridges for optimal unblocking.

Description

Technical Field

[0001] This invention relates to a purification tower, and more particularly to a purification tower for air pollution control. Background Technology

[0002] Air pollution refers to the phenomenon where the concentration of certain substances in the atmosphere reaches harmful levels, damaging ecosystems and the conditions for normal human survival and development, and causing harm to people or things. Air pollutants enter the atmosphere from anthropogenic or natural sources, participate in the atmospheric cycle, and after a certain residence time, are removed from the atmosphere through chemical reactions, biological activities, and physical sedimentation. If the rate of output is less than the rate of input, they will accumulate relatively in the atmosphere, causing an increase in the concentration of certain substances in the atmosphere. When the concentration increases to a certain level, it will directly or indirectly cause acute or chronic harm to people, organisms, or materials, and the atmosphere is polluted.

[0003] Nowadays, due to industrial development, many factories emit waste gas that pollutes the atmosphere. Therefore, it is necessary to purify the gas before it is emitted. Purification towers are a good type of purification equipment. However, because the waste gas contains a certain amount of solid particles, it can easily cause blockage of the filtration device of the purification tower, affecting the normal use of the purification tower.

[0004] To address the aforementioned issues, Chinese patent CN110732191B discloses a purification tower for air pollution control, comprising a tower body and a support. A support ring is fixedly connected to the periphery of the tower body. A first air pump and a second air pump are fixedly connected to the periphery of the tower body, with filter nozzles connected to one end of each air pump. A damping and shock-absorbing tube is fixedly connected to one surface of the support. Several damping and shock-absorbing tubes are fixedly connected to the support ring at one end. Two vibration motors are also fixedly connected to the bottom of the support ring. An upper and lower gas collection hood are rotatably connected to the inner wall of the tower body via bearings. This air pollution control purification tower, through the design of the drain pipe, vibration motors, first air pump, and second air pump, enables the tower to quickly complete the self-cleaning process of the filter cartridge from the inside out using vibration and reverse filtration principles, thereby effectively reducing the clogging rate of the filter cartridge and extending its service life.

[0005] Although the purification towers used for air pollution control can reduce the clogging rate of the filter cartridges through vibration and reverse filtration, the gas filtered is dispersed, so it cannot effectively unclog the filter cartridges locally. When the filter cartridges are locally clogged, they can still filter, but their filtration efficiency is significantly reduced, affecting the efficiency and effectiveness of air pollution control. Summary of the Invention

[0006] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is how to provide a purification tower for air pollution control that can unclog the local blockage of the filter cartridge, thereby ensuring its filtration efficiency.

[0007] To address the aforementioned problems, this invention provides a purification tower for air pollution control, comprising a purification tower body, with an upper gas collection hood and a lower gas collection hood respectively installed at the upper and lower ends of the purification tower body, and multiple filter cartridges fixedly connected between the upper and lower gas collection hoods.

[0008] The purification tower body is equipped with a precision back-filtration mechanism, which consists of multiple back-filtration cleaning rings with internal cavities. Each back-filtration cleaning ring corresponds to a filter cartridge. The back-filtration cleaning rings are movably sleeved on the outside of the filter cartridges. A trigger is provided on the back-filtration cleaning rings. When the trigger is activated, the back-filtration cleaning rings spray high-pressure gas onto the local blockage areas on the filter cartridges to clear the blockage.

[0009] The purification tower body is also equipped with driven components and transmission components. The driven components move with the gas flow in the upper or lower gas collection hood, and the transmission components transmit the movement of the driven components to the precision reverse filtration mechanism and drive the precision reverse filtration mechanism to move vertically up and down along the purification tower body.

[0010] In the aforementioned air pollution control purification tower, multiple back-filter cleaning rings corresponding one-to-one with the filter cartridges are installed, and corresponding triggering elements are installed on the back-filter cleaning rings. When the triggering elements are activated, the back-filter cleaning rings spray high-pressure gas onto the local blockage areas on the filter cartridges to clear the blockages. This achieves the purpose of precisely clearing the local blockage areas on the filter cartridges, thereby ensuring the filtration efficiency of the filter cartridges and avoiding a decrease in filtration efficiency due to local blockages. This ensures that the air pollution control purification tower maintains a stable efficiency and effect in controlling air pollution.

[0011] Furthermore, the design of the driven and transmission components allows the precision reverse filtration mechanism to automatically change its position within the purification tower, thereby ensuring that the precision reverse filtration mechanism can comprehensively inspect and unclog the filter cartridge, achieving excellent unclogging results.

[0012] As a further supplement to this application, the precision back-filtration mechanism also includes a connecting pipe and a flexible gas delivery pipe. Multiple connecting pipes are provided, and each connecting pipe is fixed between two adjacent back-filtration cleaning rings and connects the two back-filtration cleaning rings.

[0013] One end of the flexible gas delivery pipe is fixed and connected to one of the connecting pipes, and the other end of the flexible gas delivery pipe is connected to an external reverse filter pump.

[0014] As a further supplement to this application, a plurality of cleaning nozzles are fixed and connected to the inner side of the back filter cleaning ring and are circumferentially distributed along the central axis of the back filter cleaning ring.

[0015] The triggering element includes a trigger sensor, which is electrically connected to an external controller that controls the opening and closing of the cleaning air nozzle.

[0016] As a further supplement to this application, the driven element includes a follower turbine, and two follower turbines are provided and located in the upper gas hood and the lower gas hood respectively. The follower turbine is located at the smaller inner diameter of the upper gas hood or the lower gas hood.

[0017] As a further supplement to this application, the transmission component includes a drive assembly, which includes a reciprocating screw and a slider. The upper and lower ends of the reciprocating screw rotate through the end walls of the upper and lower gas collecting hoods that are close to each other, and the upper and lower ends of the reciprocating screw are fixed to two follower turbines respectively.

[0018] The slider is movably sleeved on and adapted to the reciprocating lead screw. Multiple connecting rods are fixed around the slider, and the ends of the multiple connecting rods away from the slider are respectively fixed to multiple back filter cleaning rings.

[0019] As another improvement of this application, a plurality of cleaning air nozzles are fixed and connected to the inner side of the back filter cleaning ring and are circumferentially distributed along the central axis of the back filter cleaning ring.

[0020] The triggering element includes a flexible airbag, a sealing element, and a transmission structure. The flexible airbag is fixed to the back filter cleaning ring and one end is located in the cavity of the back filter cleaning ring.

[0021] When the flexible airbag is compressed by the air discharged from the filter cartridge, the flexible airbag deforms and drives the sealing component through the transmission structure to seal the opening of the cleaning air nozzle.

[0022] When the end of the flexible airbag is not compressed by air, the flexible airbag recovers and drives the sealing component through the transmission structure to release the blockage on the opening of the cleaning nozzle.

[0023] As a further improvement to this application, the transmission structure includes a connecting air tube that is connected to a flexible airbag.

[0024] The sealing component includes a sealing airbag, which is connected to the connecting air tube and is located inside the opening of the cleaning nozzle.

[0025] As another improvement of this application, the transmission structure includes a transmission rod and a connecting column. The transmission rod is fixed to the inner wall of the flexible airbag and moves with the deformation of the flexible airbag. One end of the connecting column is fixed to the middle of the transmission rod.

[0026] The sealing component includes a vent plate and a sealing plate. Both the vent plate and the sealing plate have through holes, which are staggered. The vent plate is fixed to the inner wall of the flexible airbag, and one side of the sealing plate is fixed to the other end of the connecting column. The sealing plate is located on the side of the vent plate away from the transmission rod.

[0027] In summary, by setting up multiple back-filter cleaning rings that correspond one-to-one with the filter cartridges, and installing corresponding triggering elements on the back-filter cleaning rings, when the triggering elements are activated, the back-filter cleaning rings spray high-pressure gas onto the locally blocked areas on the filter cartridges to clear them. This achieves the purpose of precisely clearing the locally blocked areas on the filter cartridges, thereby ensuring the filtration efficiency of the filter cartridges and avoiding a decrease in filtration efficiency due to local blockages. This allows the purification tower used for air pollution control to maintain a stable efficiency and effect in treating air pollution.

[0028] Furthermore, the design of the driven and transmission components allows the precision reverse filtration mechanism to automatically change its position within the purification tower, thereby ensuring that the precision reverse filtration mechanism can comprehensively inspect and unclog the filter cartridge, achieving excellent unclogging results. Attached Figure Description

[0029] Figure 1 This is an overall cross-sectional view of the first embodiment of this application;

[0030] Figure 2 This is a schematic diagram of the precise reverse filtration mechanism, follower turbine, and drive assembly structure according to the first embodiment of this application;

[0031] Figure 3 This is a schematic diagram of the follower turbine and drive assembly structure according to the first embodiment of this application;

[0032] Figure 4 This is a top view of the precision back-filter mechanism according to the first embodiment of this application;

[0033] Figure 5 This is a schematic diagram of the three-dimensional structure of the back filter cleaning ring according to the first embodiment of this application;

[0034] Figure 6 This is a cross-sectional view of the back filter cleaning ring according to the second embodiment of this application;

[0035] Figure 7 This is a cross-sectional view of the back filter cleaning ring according to the third embodiment of this application;

[0036] Figure 8 for Figure 7 Enlarged view of the structure at point A in the middle.

[0037] Explanation of the labels in the diagram:

[0038] 1. Purification tower body; 2. Upper gas collection hood; 3. Lower gas collection hood; 4. Filter cartridge; 5. Precision reverse filtration mechanism; 501. Reverse filtration cleaning ring; 5011. Cleaning nozzle; 5012. Trigger sensor; 5013. Flexible airbag; 5014. Connecting air pipe; 5015. Sealing airbag; 5016. Drive rod; 5017. Connecting column; 5018. Air permeable plate; 5019. Sealing plate; 502. Connecting pipe; 503. Elastic air delivery pipe; 6. Follow-up turbine; 7. Drive assembly; 701. Reciprocating screw; 702. Slider; 7021. Connecting rod. Detailed Implementation

[0039] The three embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0040] Implementation method 1:

[0041] This invention provides a purification tower for air pollution control; please refer to [link / reference]. Figures 1-3 The purification tower body 1 includes an upper gas collection hood 2 and a lower gas collection hood 3 installed at the upper and lower ends of the purification tower body 1, and multiple filter cartridges 4 are fixed and connected between the upper gas collection hood 2 and the lower gas collection hood 3.

[0042] The purification tower body 1 is equipped with a precision back-filtration mechanism 5. The precision back-filtration mechanism 5 consists of multiple back-filtration cleaning rings 501 with internal cavities. Each back-filtration cleaning ring 501 corresponds to a multiple filter cartridge 4. The back-filtration cleaning ring 501 is movably sleeved on the outside of the filter cartridge 4. A trigger is provided on the back-filtration cleaning ring 501. When the trigger is triggered, the back-filtration cleaning ring 501 sprays high-pressure gas onto the local blockage area on the filter cartridge 4 to clear it.

[0043] The purification tower body 1 is also equipped with a driven component and a transmission component. The driven component moves with the gas flow in the upper gas collecting hood 2 or the lower gas collecting hood 3. The transmission component transmits the movement of the driven component to the precision reverse filtration mechanism 5 and drives the precision reverse filtration mechanism 5 to move vertically up and down along the purification tower body 1.

[0044] Based on the above structure, multiple back-filter cleaning rings 501 corresponding one-to-one with the filter cartridge 4 are set, and corresponding triggers are set on the back-filter cleaning rings 501. When the triggers are triggered, the back-filter cleaning rings 501 spray high-pressure gas onto the local blockage areas on the filter cartridge 4 to clear the blockages. This achieves the purpose of precisely clearing the local blockage areas on the filter cartridge 4, thereby ensuring the filtration efficiency of the filter cartridge 4 and avoiding the decrease in filtration efficiency caused by local blockages in the filter cartridge 4. This ensures that the purification tower used for air pollution control always maintains a stable efficiency and effect in treating air pollution.

[0045] Furthermore, the arrangement of the driven and transmission components enables the precision reverse filtration mechanism 5 to automatically change its position within the purification tower body 1, thereby ensuring that the precision reverse filtration mechanism 5 can perform comprehensive inspection and unblocking of the filter cartridge 4, achieving a good unblocking effect.

[0046] Figure 2 and Figure 4 The precision back-filtration mechanism 5 also includes a connecting pipe 502 and an elastic air supply pipe 503. Multiple connecting pipes 502 are provided, and each connecting pipe 502 is fixed between two adjacent back-filtration cleaning rings 501 and connects the two back-filtration cleaning rings 501.

[0047] One end of the flexible gas supply pipe 503 is fixed and connected to one of the connecting pipes 502, and the other end of the flexible gas supply pipe 503 is connected to an external reverse filter air pump. The external reverse filter air pump is an input air pump commonly used in the prior art and applicable to this embodiment, used to pump external gas into multiple reverse filter cleaning rings 501 through the flexible gas supply pipe 503.

[0048] By connecting the through pipe 502 and the flexible gas supply pipe 503, multiple back filter cleaning rings 501 can be connected to form a unified lifting and lowering whole, and the multiple back filter cleaning rings 501 can be interconnected, thereby achieving the purpose of pumping gas into multiple back filter cleaning rings 501 using a single flexible gas supply pipe 503.

[0049] Figure 5 The back filter cleaning ring 501 is shown to have multiple cleaning nozzles 5011 fixed to and connected to the inner side of the back filter cleaning ring 501 and distributed circumferentially along the central axis of the back filter cleaning ring 501;

[0050] The triggering element includes a trigger sensor 5012. The trigger sensor 5012 is a commonly used sensor in the prior art and applicable to this embodiment. The trigger sensor 5012 can sense whether gas is blown out from the corresponding part of the filter cartridge 4. If gas is blown out, the trigger sensor 5012 is not triggered; if no gas is blown out, the trigger sensor 5012 is triggered. The trigger sensor 5012 is electrically connected to an external controller. The external controller is a programmable industrial controller (PLC) commonly used in the prior art and applicable to this embodiment. The external controller controls the opening and closing of the cleaning nozzle 5011. When the trigger sensor 5012 is triggered, the external controller controls the cleaning nozzle 5011 to open; when the trigger sensor 5012 is not triggered, the external controller controls the cleaning nozzle 5011 to close.

[0051] By setting the trigger sensor 5012 and working with an external controller, the filter cartridge 4 can be automatically sensed for local blockage. When a blockage occurs, the cleaning nozzle 5011 will be automatically opened to back-filter and clear the blockage, ensuring that the local area of ​​the filter cartridge 4 remains unobstructed.

[0052] Figures 1-3 The driven component includes a follower turbine 6. Two follower turbines 6 are provided and are located in the upper gas collecting hood 2 and the lower gas collecting hood 3 respectively. The follower turbine 6 is located at the smaller inner diameter of the upper gas collecting hood 2 or the lower gas collecting hood 3.

[0053] The transmission component includes a drive assembly 7, which includes a reciprocating screw 701 and a slider 702. The upper and lower ends of the reciprocating screw 701 rotate through the close end walls of the upper gas collecting hood 2 and the lower gas collecting hood 3 respectively. The upper and lower ends of the reciprocating screw 701 are fixed to two follower turbines 6 respectively.

[0054] The slider 702 is movably sleeved on and adapted to the reciprocating screw 701. Multiple connecting rods 7021 are fixed around the slider 702. The ends of the multiple connecting rods 7021 away from the slider 702 are respectively fixed to multiple back filter cleaning rings 501.

[0055] With the arrangement of the follower turbine 6, reciprocating screw 701 and slider 702, when the gas flows through the upper gas collecting hood 2 and the lower gas collecting hood 3, the follower turbine 6 rotates with the airflow. The follower turbine 6 further drives the reciprocating screw 701 to rotate, thereby driving the slider 702 to slide up and down along the reciprocating screw 701. This drives multiple back filter cleaning rings 501 that are fixedly connected to the slider 702 by the connecting rod 7021 to move up and down synchronously, thereby driving the entire precision back filter mechanism 5 to move up and down, so as to achieve precise cleaning of multiple filter cartridges 4.

[0056] The second implementation method:

[0057] Figures 6-7 The back filter cleaning ring 501 is shown to have multiple cleaning nozzles 5011 fixed to and connected to the inner side of the back filter cleaning ring 501 and distributed circumferentially along the central axis of the back filter cleaning ring 501;

[0058] The triggering element includes a flexible airbag 5013, a sealing element, and a transmission structure. The flexible airbag 5013 is fixed to the back filter cleaning ring 501 and one end is located in the cavity of the back filter cleaning ring 501.

[0059] When the end of the flexible airbag 5013 is squeezed by the air discharged from the filter cartridge 4, the flexible airbag 5013 deforms and drives the sealing component through the transmission structure to seal the opening of the cleaning nozzle 5011.

[0060] When the end of the flexible airbag 5013 is not compressed by air, the flexible airbag 5013 recovers and drives the sealing component through the transmission structure to release the blockage on the opening of the cleaning nozzle 5011.

[0061] Figure 6 The transmission structure is shown to include a connecting air tube 5014, which is connected to a flexible airbag 5013.

[0062] The sealing component includes a sealing airbag 5015, which is connected to a connecting air tube 5014 and is located inside the opening of a cleaning nozzle 5011.

[0063] With the flexible airbag 5013, the connecting air tube 5014, and the sealing airbag 5015, when the flexible airbag 5013 is squeezed by the gas blown out of the filter cartridge 4 (at this time the filter cartridge 4 is not blocked), the air in the flexible airbag 5013 is squeezed and moves from the connecting air tube 5014 to the sealing airbag 5015. At this time, the sealing airbag 5015 deforms and its diameter increases, thereby blocking the opening of the cleaning nozzle 5011, completing the sealing of the cleaning nozzle 5011, so that the cleaning nozzle 5011 will not blow out gas.

[0064] When the flexible airbag 5013 is not compressed by the gas blown out of the filter cartridge 4 (at this time the filter cartridge 4 is blocked), the flexible airbag 5013 resets under its own elasticity, and the compressed air returns to the flexible airbag 5013, thereby causing the blocking airbag 5015 to contract and lose its blockage of the opening of the cleaning nozzle 5011. At this time, the cleaning nozzle 5011 can spray air to clear the blockage of the filter cartridge 4.

[0065] The above structure can achieve the purpose of mechanically and automatically cleaning the clogged parts of the filter cartridge 4 without connecting to an external controller. Reducing the use of sensors can reduce equipment costs and operating expenses to a certain extent, while still achieving the same automatic unblocking purpose.

[0066] The third implementation method:

[0067] Figures 7-8 The transmission structure shown includes a transmission rod 5016 and a connecting column 5017. The transmission rod 5016 is fixed to the inner wall of the flexible airbag 5013 and moves with the deformation of the flexible airbag 5013. One end of the connecting column 5017 is fixed to the middle of the transmission rod 5016.

[0068] The sealing component includes a vent plate 5018 and a sealing plate 5019. Both the vent plate 5018 and the sealing plate 5019 have through holes, which are staggered. The vent plate 5018 is fixed to the inner wall of the flexible airbag 5013, and one side of the sealing plate 5019 is fixed to the other end of the connecting column 5017. The sealing plate 5019 is located on the side of the vent plate 5018 away from the transmission rod 5016.

[0069] With the configuration of transmission rod 5016, connecting column 5017, vent plate 5018 and sealing plate 5019, when the flexible airbag 5013 is squeezed by the gas blown out of filter cartridge 4, the air inside the flexible airbag 5013 is squeezed, causing the side of the flexible airbag 5013 located in the cavity of the reverse filter cleaning ring 501 to be deformed by pressure. Thus, the sealing plate 5019 is driven to move closer to the vent plate 5018 through transmission rod 5016 and connecting column 5017. When the sealing plate 5019 is in contact with the vent plate 5018, the sealing plate 5019 and the vent plate 5018 together form a closed plate body, which seals the opening of the cleaning nozzle 5011.

[0070] When the flexible airbag 5013 is not squeezed by the gas blown out of the filter cartridge 4, the flexible airbag 5013 resets under its own elasticity, so that the flexible airbag 5013 drives the sealing plate 5019 to separate from the vent plate 5018 through the transmission rod 5016 and the connecting column 5017, and moves to the side away from the vent plate 5018, thus releasing the blockage at the opening of the cleaning air nozzle 5011.

[0071] The above solution can also achieve the purpose of mechanical automatic dredging and achieve good results.

[0072] In light of current practical needs, the above-described embodiments adopted in this application are not limited to these. Any changes made within the scope of knowledge possessed by those skilled in the art without departing from the concept of this application still fall within the protection scope of this invention.

Claims

1. A purification tower for air pollution control, comprising a purification tower body (1), wherein an upper gas collecting hood (2) and a lower gas collecting hood (3) are respectively installed at the upper and lower ends of the purification tower body (1), and a plurality of filter cartridges (4) are fixedly connected between the upper gas collecting hood (2) and the lower gas collecting hood (3), characterized in that: The purification tower body (1) is equipped with a precision back-filtration mechanism (5). The precision back-filtration mechanism (5) is composed of multiple back-filtration cleaning rings (501) with internal cavities. Each of the multiple back-filtration cleaning rings (501) corresponds to a multiple filter cartridges (4). The back-filtration cleaning rings (501) are movably sleeved on the outside of the filter cartridges (4). A trigger is provided on the back-filtration cleaning rings (501). When the trigger is triggered, the back-filtration cleaning rings (501) spray high-pressure gas onto the local blockage area on the filter cartridges (4) to clear the blockage. The purification tower body (1) is also equipped with a driven component and a transmission component. The driven component moves with the gas flow in the upper gas collecting hood (2) or the lower gas collecting hood (3). The transmission component transmits the movement of the driven component to the precision reverse filtration mechanism (5) and drives the precision reverse filtration mechanism (5) to move vertically up and down along the purification tower body (1). The precision back-filtration mechanism (5) further includes a connecting pipe (502) and an elastic gas delivery pipe (503). Multiple connecting pipes (502) are provided, and each connecting pipe (502) is fixed between two adjacent back-filtration cleaning rings (501) and connects the two back-filtration cleaning rings (501). One end of the elastic gas delivery pipe (503) is fixed and connected to one of the connecting pipes (502), and the other end of the elastic gas delivery pipe (503) is connected to an external reverse filter pump. The inner side of the back filter cleaning ring (501) is fixed and connected to a plurality of cleaning nozzles (5011) that are circumferentially distributed along the central axis of the back filter cleaning ring (501). The triggering element includes a trigger sensor (5012), which is electrically connected to an external controller that controls the opening and closing of the cleaning nozzle (5011).

2. The purification tower for air pollution control according to claim 1, characterized in that: The driven component includes a follower turbine (6), two follower turbines (6) are provided and are respectively located in the upper gas hood (2) and the lower gas hood (3), and the follower turbine (6) is located at the smaller inner diameter of the upper gas hood (2) or the lower gas hood (3).

3. A purification tower for air pollution control according to claim 2, characterized in that: The transmission component includes a drive assembly (7), which includes a reciprocating screw (701) and a slider (702). The upper and lower ends of the reciprocating screw (701) rotate through the end walls of the upper gas hood (2) and the lower gas hood (3) that are close to each other. The upper and lower ends of the reciprocating screw (701) are fixed to two follower turbines (6). The slider (702) is movably sleeved on the reciprocating screw (701) and adapted to the reciprocating screw (701). Multiple connecting rods (7021) are fixed around the slider (702). The ends of the multiple connecting rods (7021) away from the slider (702) are respectively fixed to multiple back filter cleaning rings (501).

4. The purification tower for air pollution control according to claim 1, characterized in that: The inner side of the back filter cleaning ring (501) is fixed and connected to a plurality of cleaning nozzles (5011) that are circumferentially distributed along the central axis of the back filter cleaning ring (501). The triggering element includes a flexible airbag (5013), a sealing element and a transmission structure. The flexible airbag (5013) is fixed to the back filter cleaning ring (501) and one end is located in the cavity of the back filter cleaning ring (501). When the end of the flexible airbag (5013) is squeezed by the air discharged from the filter cartridge (4), the flexible airbag (5013) deforms and drives the sealing component through the transmission structure to seal the opening of the cleaning nozzle (5011); When the end of the flexible airbag (5013) is not compressed by air, the flexible airbag (5013) recovers and drives the sealing component through the transmission structure to release the blockage of the opening of the cleaning nozzle (5011).

5. A purification tower for air pollution control according to claim 4, characterized in that: The transmission structure includes a connecting air tube (5014), which is connected to a flexible airbag (5013); The sealing component includes a sealing airbag (5015), which is connected to a connecting air tube (5014) and is located inside the opening of a cleaning nozzle (5011).

6. A purification tower for air pollution control according to claim 4, characterized in that: The transmission structure includes a transmission rod (5016) and a connecting column (5017). The transmission rod (5016) is fixed to the inner wall of the flexible airbag (5013) and moves with the deformation of the flexible airbag (5013). One end of the connecting column (5017) is fixed to the middle of the transmission rod (5016). The sealing component includes a vent plate (5018) and a sealing plate (5019). Both the vent plate (5018) and the sealing plate (5019) have through holes. The through holes on the vent plate (5018) and the sealing plate (5019) are staggered. The vent plate (5018) is fixed to the inner wall of the flexible airbag (5013). One side of the sealing plate (5019) is fixed to the other end of the connecting column (5017). The sealing plate (5019) is located on the side of the vent plate (5018) away from the transmission rod (5016).

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