A waste gas washing tower with self-cleaning function of filler layer

Abstract

The application discloses a waste gas washing tower with a filler layer self-cleaning function, and belongs to the technical field of waste gas filtration. The application comprises a tower body, a plurality of array-distributed flexible variable-structure filler mechanisms arranged in the tower body, a linear driver arranged on the inner wall of the tower body, and a flushing mechanism arranged in the tower body. The flexible variable-structure filler mechanism is configured to be switched between a vertical stretching state and a loose filling state. The linear driver is used to drive the flexible variable-structure filler mechanism to be switched between the vertical stretching state and the loose filling state. The flushing mechanism is used to flush the flexible variable-structure filler mechanism in the vertical stretching state. According to the application, the flexible variable-structure filler mechanism is switched to the vertical stretching state, so that vertical through chip removal channels are formed between the filler mechanisms, and the flushing mechanism is used for targeted injection from the inside of the filler mechanism, so that the cleaning dead angle is eliminated, and in-situ deep self-cleaning of the filler layer is realized.

Description

Technical Field

[0001] This invention relates to the field of waste gas filtration technology, and specifically to a waste gas scrubbing tower with a self-cleaning function for the packing layer. Background Technology

[0002] Exhaust gas scrubbing towers, as highly efficient gas-liquid mass transfer devices, are widely used in the purification and treatment of exhaust gases in industries such as chemical, coating, pharmaceutical, and new materials. Their basic working principle involves using a packing layer arranged within the tower as a contact medium, allowing the exhaust gas flowing upwards to fully countercurrently contact the scrubbing liquid sprayed downwards on the packing surface, thereby completing the physical dissolution and absorption or chemical neutralization reaction of pollutants. Existing scrubbing towers typically employ fixed rigid packing (such as bulk packing or structured packing) with a large specific surface area and constant porosity to construct the bed, aiming to provide a continuous and stable gas-liquid mass transfer interface under standard operating conditions, thus ensuring the normal operation of the exhaust gas treatment system.

[0003] However, existing exhaust gas scrubbing towers have significant structural defects when dealing with complex and ever-changing actual operating conditions. Specifically, conventional gas-liquid backwashing technology not only consumes a huge amount of water, but also suffers from a sharp decrease in kinetic energy due to the complex pore structure of the packing layer. This results in the packing layer at the bottom not receiving effective fluid scouring force, inevitably creating large cleaning dead zones. This causes soft scale to accumulate and thicken in these dead zones, drastically increasing the system's operating resistance and ultimately inducing semi-closed airflow channels, affecting the efficiency of exhaust gas filtration. Summary of the Invention

[0004] The purpose of this invention is to provide a waste gas scrubbing tower with a self-cleaning function for the packing layer, which solves the problem that existing waste gas scrubbing towers have dead cleaning corners due to the difficulty of conventional backwashing fluids effectively reaching the bottom packing layer, resulting in continuous accumulation of dirt and subsequent sudden increase in wind resistance and blockage of airflow channels.

[0005] The present invention solves the above-mentioned technical problems through the following technical solutions, the present invention comprising:

[0006] tower body;

[0007] Multiple flexible variable-structure packing mechanisms are disposed within the tower body, and the multiple flexible variable-structure packing mechanisms are arranged in an array. The flexible variable-structure packing mechanisms are configured to switch between a vertically stretched state and a loosened filling state.

[0008] A linear actuator is installed on the inner wall of the tower body. The linear actuator is used to drive the flexible variable packing mechanism to switch between a vertically stretched state and a loosened packing state.

[0009] A flushing mechanism, located inside the tower body, is used to flush the flexible variable packing mechanism in a vertically stretched state.

[0010] Preferably, the inner wall of the tower body is fixed with a lower fixed frame, the linear actuator is located on the upper side of the upper fixed frame, and the telescopic end of the linear actuator is connected to the upper fixed frame. A plurality of the flexible variable-structure packing mechanisms are arranged between the lower fixed frame and the upper fixed frame.

[0011] Preferably, the flexible variable-structure packing mechanism includes an isolation mesh cylinder, multiple steel wire ropes disposed inside the isolation mesh cylinder, and multiple packing materials rotatably mounted on the steel wire ropes.

[0012] Preferably, the flushing mechanism includes a water pipe assembly installed on the upper side of the upper fixed frame and a plurality of vertical soft water pipes connected to the water pipe assembly; the plurality of vertical soft water pipes are respectively inserted into the isolation mesh cylinders of a plurality of flexible variable structure packing mechanisms, and the vertical soft water pipes are provided with drainage holes.

[0013] Preferably, it further includes a lateral movement mechanism, which is disposed at the drive end of the linear drive and connected to the upper fixed frame, for driving the upper fixed frame to move laterally.

[0014] Preferably, the lateral movement mechanism includes a circular frame fixed to the drive end of the linear actuator, a movable frame slidably disposed within the circular frame, and a drive component for driving the movable frame to move laterally reciprocally, wherein the upper fixed frame is fixed to the movable frame.

[0015] Preferably, the driving component includes a screw rotatably mounted on a circular frame and a motor for driving the screw to rotate; the movable frame is provided with a threaded sleeve that is threadedly connected to the screw.

[0016] Preferably, the multiple flexible variable-structure packing mechanisms are distributed in multiple rows, and the flexible variable-structure packing mechanisms in adjacent rows are staggered.

[0017] This invention also proposes a packing cleaning method, which uses a waste gas scrubbing tower with a self-cleaning function for the packing layer as described above to clean the packing, including the following steps:

[0018] Step 1: Drive the linear actuator to raise the upper end of the flexible variable packing mechanism, switch the flexible variable packing mechanism from the loose filling state of mutual contact to the vertical stretching state, so that a vertically connected chip removal channel is formed between each flexible variable packing mechanism.

[0019] Step 2: Under vertical tension, a cleaning fluid is sprayed onto the packing of the flexible variable packing mechanism through a flushing mechanism to remove dirt adhering to the surface of the packing.

[0020] Step 3: Drive the linear actuator to lower the upper end of the flexible variable structure packing mechanism, and at the same time drive the upper end of the flexible variable structure packing mechanism to move laterally back and forth through the transverse movement mechanism, so that the flexible variable structure packing mechanism is folded and laid in a serpentine pattern inside the tower.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. This invention features a flexible, variable-structure packing mechanism that can switch between a vertically stretched state and a loosened filling state. During cleaning, the packing mechanism is driven to switch to the vertically stretched state, creating a wide vertical chip removal channel between each packing mechanism. This, combined with a flushing mechanism embedded within the packing mechanism, enables targeted spraying, completely avoiding the problem of traditional backwashing fluid failing to effectively reach the bottom packing layer due to kinetic energy attenuation. This eliminates cleaning dead zones and achieves in-situ deep self-cleaning of the packing layer.

[0023] 2. In this invention, the packing material is rotatably mounted on a steel wire rope, and the drain hole of the flushing mechanism is set horizontally or inclined. When the high-pressure cleaning fluid is sprayed, it generates an unbalanced force when it impacts the packing material, driving the packing material to rotate at high speed. It uses centrifugal force and mechanical shearing force to completely peel off stubborn scale and soft dirt from the surface, which greatly improves the cleaning effect and efficiency.

[0024] 3. The present invention, through the cooperation of the transverse mechanism and the linear actuator, drives the upper end of the packing mechanism to move laterally back and forth when it falls, so that the packing mechanism is folded and laid in a serpentine pattern. This not only eliminates the straight gap between adjacent packing mechanisms, but also prolongs the residence time of exhaust gas in the packing layer, strengthens the micro turbulence effect, and effectively prevents the phenomena of "gas-liquid deviation" or "wall flow".

[0025] 4. The isolation net cylinder of the present invention is made of soft material, which can adapt to the outward bulging deformation when the filling mechanism collapses and fills, ensuring that the packing in adjacent filling mechanisms are in close contact to build a mass transfer labyrinth, while also acting as a physical barrier, effectively preventing the steel wire rope or packing from becoming irreversibly entangled and knotted.

[0026] 5. This invention can promptly remove the dirt accumulated in the packing layer by periodically or based on feedback from wind resistance and pressure drop, thus avoiding sudden increases in wind resistance and partial blockage of airflow channels, thereby maintaining long-term stable operation of the equipment and significantly extending the maintenance cycle and service life of the equipment. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0028] Figure 2 This is a schematic diagram of the front sectional planar structure of the present invention;

[0029] Figure 3 for Figure 2A top-view schematic diagram of the transverse movement mechanism and the flexible variable-structure packing mechanism in the middle;

[0030] Figure 4 for Figure 2 A three-dimensional structural diagram of a flexible variable-structure packing mechanism;

[0031] Figure 5 for Figure 4 Enlarged structural diagram at point A in the middle;

[0032] Figure 6 This is a top-view cross-sectional structural diagram of a single flexible variable-structure packing mechanism.

[0033] The numbers in the image represent:

[0034] 1-Tower body; 11-Drainage port; 12-Air inlet; 13-Shielding shell; 14-Exhaust port; 2-Flexible variable-structure packing mechanism; 21-Isolation net cylinder; 22-Restriction block; 23-Wire rope; 24-Packing; 25-Lower fixed frame; 26-Upper fixed frame; 3-Horizontal movement mechanism; 31-Circular frame; 32-Rectangular hole; 33-Moving frame; 34-Screw; 35-Motor; 4-Linear actuator; 51-Water pipe assembly; 52-Main soft water pipe; 53-Water connector; 54-Vertical soft water pipe; 55-Drainage hole; 6-Spraying system. Detailed Implementation

[0035] The above-mentioned and other technical features and advantages of the present invention will be described in more detail below with reference to the accompanying drawings.

[0036] Example 1

[0037] This embodiment provides a technical solution: a waste gas scrubbing tower with a self-cleaning function for the packing layer, such as... Figures 1-6 As shown, the tower body 1 is supported on the ground by a bracket. The interior of the tower body 1 consists of a liquid storage area, an air inlet area, a packing area, a spray area, and an exhaust area from bottom to top. A drain port 11 connected to the liquid storage area is provided at the bottom of the tower body 1. An air inlet 12 connected to the air inlet area is provided on the side of the tower body 1. A shielding shell 13 is fixed on the inner wall of the packing area. The transverse cross-section of the inner cavity of the shielding shell 13 is rectangular. A spray system 6 is provided in the spray area. The spray system 6 is connected to an external water source. An exhaust port 14 connected to the exhaust area is provided at the top of the tower body 1.

[0038] The inner cavity of the shielding shell 13 contains multiple arrayed flexible variable-structure packing mechanisms 2, which are vertically arranged. Each flexible variable-structure packing mechanism 2 has a vertically stretched state and a loosened-filling state. When in the vertically stretched state, the entire flexible variable-structure packing mechanism 2 is vertical, and there is no contact or interference between the various flexible variable-structure packing mechanisms 2, thus entering the flushing mode. Figure 2As shown, when the flexible variable-structure packing mechanism 2 is in the unfilled state, it relaxes downwards due to gravity to fill the inner cavity of the shielding shell 13, thus entering the working mode. With this design, the device exhibits significant deformation coupling characteristics: it provides a dense contact surface area during operation and actively creates drainage space through stretching deformation during cleaning, fundamentally solving the problem that traditional rigid packing is easily blocked by soft sludge.

[0039] To enable the flexible variable-structure packing mechanism 2 to switch between a vertically stretched state and a loosened-fill state, the lower ends of multiple flexible variable-structure packing mechanisms 2 are fixedly installed to the inner wall of the tower body 1, while the upper ends of the flexible variable-structure packing mechanisms 2 are raised and lowered by a linear actuator 4 installed inside the tower body 1. When the linear actuator 4 pulls the upper end of the flexible variable-structure packing mechanism 2 upward, it is in the vertically stretched state; conversely, it is in the loosened-fill state. It should be noted that the linear actuator 4 can be a linear motor or a hydraulic drive cylinder, etc. To ensure the service life of the linear actuator 4, a sealed protective cover can be installed on the outside of the linear actuator 4.

[0040] Furthermore, multiple flexible variable-structure packing mechanisms 2 can be distributed in multiple rows, with the flexible variable-structure packing mechanisms 2 in adjacent rows being staggered, such as... Figure 3 As shown, when the flexible variable packing mechanism 2 is switched to the unfilled state, this setting can eliminate the gap between two adjacent flexible variable packing mechanisms 2, avoid the formation of a large air passage, and thus prevent the occurrence of "gas-liquid deviation" or "wall flow" phenomena.

[0041] Specifically, the lower ends of multiple flexible variable-structure packing mechanisms 2 are fixed to the inner wall of the tower body 1 via a lower fixed frame 25, and the upper ends of multiple flexible variable-structure packing mechanisms 2 are connected to the telescopic end of the linear actuator 4 via an upper fixed frame 26. The flexible variable-structure packing mechanism 2 includes an isolation net cylinder 21 fixed between the lower fixed frame 25 and the upper fixed frame 26. Multiple steel wire ropes 23 fixed to the lower fixed frame 25 and the upper fixed frame 26 are arranged inside the isolation net cylinder 21. The multiple steel wire ropes 23 are distributed in a ring. Multiple packing materials 24 are rotatably installed on the steel wire ropes 23. In order to restrict the position of the packing materials 24, a limiting block 22 fixed to the steel wire rope 23 is provided on both the upper and lower sides of the packing materials 24 to restrict the packing materials 24 to the specified position of the steel wire rope 23. There is a certain size between two adjacent steel wire ropes 23.

[0042] It should be noted that the isolation mesh cylinder 21 is made of a soft material (such as a flexible mesh segment of polytetrafluoroethylene or polypropylene), which can adaptively deform. When the flexible variable-structure packing mechanism 2 collapses downward to switch to the loosened filling state, the isolation mesh cylinder 21 undergoes outward bulging deformation. While ensuring that the packing 24 in two adjacent flexible variable-structure packing mechanisms 2 can be in close contact to form a mass transfer labyrinth, it can also act as a physical barrier to prevent the wire ropes 23 or packing 24 in adjacent flexible variable-structure packing mechanisms 2 from becoming irreversibly entangled and knotted.

[0043] To flush the flexible variable packing mechanism 2, a flushing mechanism is also provided inside the tower body 1. The mechanism includes a water pipe assembly 51 installed on the upper side of the upper fixed frame 26, and multiple vertical soft water pipes 54 are fixed on the lower side of the water pipe assembly 51. The multiple vertical soft water pipes 54 are located inside the isolation mesh cylinder 21 of the flexible variable packing mechanism 2, and multiple sets of drainage holes 55 are opened on the outside of the vertical soft water pipes 54. The multiple sets of drainage holes 55 correspond to each packing 24. The water pipe assembly 51 is connected to a water connector 53 through a main soft water pipe 52. The water connector 53 is installed on the tower body 1 and is connected to an external cleaning liquid supply device.

[0044] As the cleaning fluid enters multiple drain holes 55 through the water connector 53, main soft water pipe 52, and water pipe assembly 51, the final cleaning fluid will be sprayed out through multiple sets of drain holes 55. The sprayed cleaning fluid will form a high-pressure water flow to perform point-to-point targeted flushing of the packing material 24, cleaning impurities and biofilm from the surface of the packing material 24. This "embedded in-situ spraying" structure uses pipelines to directly deliver fluid to the center of the packing material before spraying it out, completely avoiding the defect of rapid kinetic energy attenuation that occurs when the top spray fluid penetrates downwards.

[0045] Furthermore, the packing material 24 is designed with a hollowed-out spherical or spherical structure on the sides, which ensures both high-pressure water flow and allows the high-pressure water to penetrate and flush all parts of the packing material 24. Even more ingeniously, because the packing material 24 is rotated on the wire rope 23, it adaptively rotates at high speed under the unbalanced flushing force of the lateral high-pressure water flow. This utilizes mechanical shearing and centrifugal force to thoroughly break down and peel off stubborn scale and elastic soft deposits. The introduction of centrifugal force further ensures that all parts of the packing material 24 are thoroughly cleaned, and the peeled-off gelatinous soft deposits are powerfully thrown off.

[0046] The cleaning solution can be a corresponding chemical agent, which can remove impurities not only through physical rinsing but also through chemical reaction. For example, for cleaning alkaline hard scale, dilute hydrochloric acid, dilute nitric acid, or a specific descaling agent can be used; for cleaning acidic precipitates, sodium hydroxide can be used; for cleaning highly viscous organic matter or tar, organic solvents / surfactants can be used.

[0047] In this embodiment, when the upper fixed frame 26 is pulled upward by the linear actuator 4, the multiple flexible variable structure filling mechanisms 2 can eventually switch to the vertical stretching state under the pull of the upper fixed frame 26. When the upper fixed frame 26 is pushed downward by the linear actuator 4, the multiple flexible variable structure filling mechanisms 2 can be spread out downward by their own gravity and switch to the loose filling state.

[0048] Example 2

[0049] This embodiment is a further optimization based on Embodiment 1. The parts that are the same as those described above will not be repeated here. Figure 2 and Figure 3 As shown, to further improve mass transfer efficiency and prevent channel solidification, the following configuration is specifically adopted:

[0050] In this embodiment, a lateral movement mechanism 3 is provided. The lateral movement mechanism 3 is located at the telescopic end of the linear actuator 4 and is used to drive the upper fixed frame 26 to make lateral displacement. During the process of the flexible variable-structure packing mechanism 2 falling and switching to the unfilled state, the upper end of the flexible variable-structure packing mechanism 2 is driven to reciprocate laterally by the lateral movement mechanism 3. Under the deformation coupling mechanism of vertical lowering and lateral dragging, the flexible variable-structure packing mechanism 2 will be laid in the inner cavity of the shielding shell 13 in the form of a folded serpentine line. This dynamic folding not only allows multiple flexible variable-structure packing mechanisms 2 to be stacked vertically alternately, completely eliminating the straight gap between adjacent flexible variable-structure packing mechanisms 2, but also greatly extends the residence time of exhaust gas in the packing layer and enhances the micro turbulence effect.

[0051] The lateral movement mechanism 3 includes a circular frame 31 fixed to the telescopic end of the linear actuator 4. A rectangular hole 32 is provided in the middle of the circular frame 31, and the size of the rectangular hole 32 is not less than the inner cavity size of the shielding shell 13. A movable frame 33 is slidably disposed inside the circular frame 31. If the sliding direction of the movable frame 33 is set to the x-direction, the x-direction dimension of the rectangular hole 32 is larger than the x-direction dimension of the movable frame 33. The upper fixing bracket 26 is fixed to the movable frame 33. A driving component is provided on the circular frame 31, and the driving component drives the movable frame 33 to perform reciprocating lateral displacement along the x-direction.

[0052] The driving component includes a screw 34 fixed to the upper side of the circular frame 31 via a rotating seat, and a threaded sleeve that is threadedly connected to the screw 34 is fixed on the movable frame 33. A motor 35 that drives the screw 34 to rotate is fixed on one of the rotating seats, and a protective cover is provided on the outside of the motor 35 to prevent corrosion.

[0053] When motor 35 rotates alternately in forward and reverse directions, drive screw 34 rotates in both directions, further driving the moving frame 33 to move smoothly laterally using a threaded transmission mechanism. It should be noted that, in this embodiment, to ensure force balance on the moving frame and prevent jamming during installation, at least two sets of drive components need to be installed in parallel. In other embodiments, to simplify the mechanical transmission chain, the drive component can also be replaced by a linear motor or a bidirectional hydraulic drive cylinder.

[0054] The specific working process of the scrubbing tower in this embodiment is briefly described as follows:

[0055] 1. Working mode: The linear actuator 4 pushes the upper fixed frame 26 downward, while the motor 35 drives the upper fixed frame 26 to reciprocate laterally. The flexible variable-structure packing mechanism 2 is tightly packed in a serpentine fold inside the shielding shell 13. Subsequently, the spray system 6 is turned on, and the exhaust gas enters from the air inlet 12 and passes through the packing layer to be absorbed and purified by the liquid film. The qualified gas is discharged from the exhaust port 14.

[0056] 2. Flushing mode: Periodically or according to the feedback of wind resistance pressure drop, the spraying and air intake are paused, the linear drive 4 pulls the upper fixed frame 26 upward, so that all flexible variable structure packing mechanism 2 is straightened and separated; the external cleaning liquid pump pumps high pressure liquid into the vertical soft water pipe 54 and ejects it horizontally from the drain hole 55, impacting the packing 24 to completely break up and peel off the stubborn scale and high elastic soft scale on the surface. The broken scale falls smoothly into the liquid storage area through the wide vertical channel formed after straightening and is discharged through the drain port 11, realizing in-situ deep self-cleaning.

[0057] The above description is merely a preferred embodiment of the present invention and is illustrative rather than restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present invention, all of which will fall within the protection scope of the present invention.

Claims

1. A waste gas scrubbing tower with a self-cleaning function for the packing layer, characterized in that, include: Tower body (1); Multiple flexible variable-structure packing mechanisms (2) are provided in the tower body (1), and the multiple flexible variable-structure packing mechanisms (2) are arranged in an array. The flexible variable-structure packing mechanism (2) is configured to switch between a vertically stretched state and a loosened filling state. A linear actuator (4) is installed on the inner wall of the tower body (1). The linear actuator (4) is used to drive the flexible variable packing mechanism (2) to switch between a vertically stretched state and a loosened packing state. A flushing mechanism is provided inside the tower body (1) and is used to flush the flexible variable packing mechanism (2) which is in a vertically stretched state.

2. The waste gas scrubbing tower with self-cleaning packing layer function according to claim 1, characterized in that, The inner wall of the tower body (1) is fixed with a lower fixed frame (25), the linear actuator (4) is located on the upper side of the upper fixed frame (26), and the telescopic end of the linear actuator (4) is connected to the upper fixed frame (26). Multiple flexible variable packing mechanisms (2) are arranged between the lower fixed frame (25) and the upper fixed frame (26).

3. The waste gas scrubbing tower with self-cleaning function of packing layer according to claim 2, characterized in that, The flexible variable-structure packing mechanism (2) includes an isolation net cylinder (21), a plurality of steel wire ropes (23) disposed inside the isolation net cylinder (21), and a plurality of packing materials (24) rotatably mounted on the steel wire ropes (23).

4. The waste gas scrubbing tower with self-cleaning function of packing layer according to claim 3, characterized in that, The flushing mechanism includes a water pipe assembly (51) installed on the upper side of the upper fixed frame (26) and a plurality of vertical soft water pipes (54) connected to the water pipe assembly (51); the plurality of vertical soft water pipes (54) are respectively inserted into the isolation net cylinder (21) of a plurality of flexible variable structure packing mechanisms (2), and the vertical soft water pipes (54) are provided with drainage holes (55).

5. The waste gas scrubbing tower with self-cleaning function of packing layer according to claim 2, characterized in that, It also includes a lateral movement mechanism (3), which is located at the drive end of the linear driver (4) and connected to the upper fixed frame (26) for driving the upper fixed frame (26) to move laterally.

6. The waste gas scrubbing tower with self-cleaning packing layer function according to claim 5, characterized in that, The lateral movement mechanism (3) includes a circular frame (31) fixed to the driving end of the linear driver (4), a movable frame (33) slidably disposed in the circular frame (31), and a driving component that drives the movable frame (33) to move laterally back and forth. The upper fixed frame (26) is fixed to the movable frame (33).

7. The waste gas scrubbing tower with self-cleaning function of packing layer according to claim 6, characterized in that, The driving component includes a screw (34) rotatably mounted on a circular frame (31) and a motor (35) for driving the screw (34) to rotate; the movable frame (33) is provided with a threaded sleeve that is threadedly connected to the screw (34).

8. The waste gas scrubbing tower with self-cleaning function of packing layer according to claim 1, characterized in that, Multiple flexible variable-structure packing mechanisms (2) are distributed in multiple rows, and the flexible variable-structure packing mechanisms (2) in adjacent rows are staggered.

9. A method for cleaning packing material, comprising cleaning the packing material using a waste gas scrubbing tower with a packing layer self-cleaning function as described in any one of claims 1-8, characterized in that, Includes the following steps: Step 1: Drive the linear actuator (4) to raise the upper end of the flexible variable packing mechanism (2), switch the flexible variable packing mechanism (2) from the loose filling state of mutual contact to the vertical stretching state, so that a vertically penetrating chip removal channel is formed between each flexible variable packing mechanism (2). Step 2: Under vertical tension, a cleaning liquid is sprayed onto the packing (24) of the flexible variable packing mechanism (2) through a flushing mechanism to remove dirt adhering to the surface of the packing (24); Step 3: Drive the linear actuator (4) to lower the upper end of the flexible variable packing mechanism (2), and at the same time drive the upper end of the flexible variable packing mechanism (2) to move back and forth laterally through the transverse mechanism (3), so that the flexible variable packing mechanism (2) is folded and laid in a serpentine pattern inside the tower body (1).

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