Waste gas purification tower

Abstract

The invention discloses a waste gas purification tower, and belongs to the technical field of gas filtration, the waste gas purification tower comprises a tower body, a plurality of filler cages and a desilting mechanism, one side of the bottom and the top of the tower body are respectively provided with a gas inlet pipe and a gas outlet pipe; the plurality of filler cages are arranged in the tower body and are distributed layer by layer along the axial direction of the tower body, and the filler cages are filled with bulk fillers; the dredging mechanism is arranged between the filler cage and the inner wall of the tower body and used for sequentially driving the telescopic cylinders to stretch out and draw back. According to the designed waste gas purification tower, the multiple filler cages are arranged, each filler cage is of a telescopic structure, when filtered dust and dirt are gradually accumulated in bulk filler, sludge blockage is formed, and the mass transfer efficiency is reduced, the filler cages can be expanded layer by layer through the dredging mechanism, so that sludge is separated from the bulk filler, and the mass transfer efficiency is improved. Therefore, the normal waste gas separation and purification capability is recovered.

Description

Technical Field

[0001] The present invention relates to the technical field of gas filtration, in particular to a waste gas purification tower. Background Art

[0002] During industrial production, a large amount of waste gas containing various pollutants is generated. To reduce the environmental pollution caused by waste gas, waste gas purification towers are widely used in the waste gas treatment field. Currently, most waste gas purification towers adopt the structure of packed towers. By filling the tower with bulk packing, the waste gas and the absorption liquid are fully contacted on the surface of the packing, thereby absorbing and purifying the pollutants in the waste gas. However, existing exhaust gas purification towers have several drawbacks. For one thing, over time, filtered dust and dirt gradually accumulate on the bulk packing, forming sludge blockages that reduce mass transfer efficiency and compromise exhaust gas purification effectiveness. Restoring purification capacity often requires manual removal of the packing for cleaning or replacement, a cumbersome and time-consuming process. Summary of the Invention

[0003] In view of the above-mentioned technical deficiencies, the object of the present invention is to provide a waste gas purification tower that can clean the sludge in the bulk filler and maintain the separation and purification effect of the waste gas.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solution: The present invention provides an exhaust gas purification tower, comprising a tower body, a plurality of filler cages and a dredging mechanism, wherein an air inlet pipe and an air outlet pipe are respectively provided on one side of the bottom and the top of the tower body; A plurality of the packing cages are arranged in the tower body and distributed layer by layer along the axial direction of the tower body. The packing cages include a bottom plate, a top plate and a telescopic cylinder. The bottom plate and the top plate are respectively arranged at the upper and lower ends of the telescopic cylinder and are both provided with air-permeable grids. The accommodating cavity formed by the bottom plate, the top plate and the telescopic cylinder is filled with bulk fillers. The desilting mechanism is arranged between the filling cage and the inner wall of the tower body, and is used to sequentially drive the telescopic cylinder to extend and retract; Among them, a liquid distribution device is installed above the top packing cage to spray absorption liquid to the packing cage below; after the exhaust gas enters the tower from the air inlet pipe, it passes through multiple packing cages from bottom to top in sequence and is discharged from the air outlet pipe.

[0005] Preferably, the telescopic cylinder includes an inner cylinder and an outer cylinder, the outer cylinder is sleeved on the inner cylinder, the outer cylinder and the inner cylinder are slidingly and sealingly connected via a sealing ring, the top plate is fixed to the top of the outer cylinder, and the bottom plate is fixed to the bottom of the inner cylinder.

[0006] Preferably, a plurality of connecting rings are provided in the tower body, corresponding to a plurality of filling cages respectively, and a support portion is provided on the inner wall of the tower body below the lowest filling cage; the upper edge of the connecting ring is fixed to the bottom edge of the inner tube, and the lower edge of the connecting ring is fixed to the outer tube of the lower filling cage, and the lower edge of the connecting ring located at the lowest position rests on the support portion.

[0007] Preferably, the dredging mechanism includes a plurality of lifting units, which are arranged on the tower body and are respectively used to drive the plurality of outer cylinders to rise and fall; Among them, a retaining ring is fixed on the outer cylinder on the uppermost filling cage, and the retaining ring is slidingly and sealingly connected to the inner wall of the tower body. The multiple lifting units drive the multiple outer cylinders to move up or down in turn.

[0008] Preferably, the lifting unit includes multiple first cylinders fixed in the tower body, and the multiple first cylinders are evenly distributed around the outer cylinder. One end of the first cylinder is fixedly connected to the inner wall of the tower body, and the other end of the first cylinder is fixedly connected to the outer cylinder.

[0009] Preferably, a collecting trough is provided on the connecting ring, and a guide slope is provided on the top of the connecting ring, so that the sludge in the filler cage flowing downward along the inner wall of the inner cylinder enters the collecting trough along the guide slope.

[0010] Preferably, a silt discharge hole is provided at the bottom of the collecting tank, and the inner cylinder is fixedly connected to a first sealing plate for sealing the silt discharge hole. When the connecting ring rises, the silt discharge hole is separated from the first sealing plate, and the silt in the collecting tank flows from the silt discharge hole to the silt storage tank formed by the support part below and the inner wall of the tower body.

[0011] Preferably, the support portion is provided with a second sealing plate that cooperates with the silt discharge hole on the lowest collection trough, and a plurality of second cylinders are provided on the inner wall of the tower body, one end of the second cylinder is fixedly connected to the inner wall of the tower body, and the other end is fixedly connected to the lowest connecting ring.

[0012] Preferably, a silt discharge pipe communicating with the silt storage tank is provided on the outer wall of the tower body, and a valve is provided on the silt discharge pipe.

[0013] Preferably, a silt blocking mechanism is provided under each of the packing cages, and the silt blocking mechanism includes a bracket fixed in the connecting ring and a fan blade rotatably mounted on the bracket. When the fan blade rotates, an upward airflow is generated, disturbing the bulk filler in the packing cage above and throwing the silt falling on the fan blade toward the inner wall of the connecting ring.

[0014] The beneficial effects of the present invention are: In the exhaust gas purification tower designed by the present invention, multiple packing cages are provided, each of which is a retractable structure. The bulk packing in the packing cage can fill the packing cage when the packing cage is in a compressed state. The liquid distribution device at the top of the tower sprays absorption liquid from top to bottom to the bulk packing in the packing cage, so that a water film is attached to the surface of the bulk packing. When the exhaust gas is absorbed and purified by multiple layers of bulk packing from the air inlet and discharged from the air outlet pipe, when the dust and stains filtered out gradually accumulate in the bulk packing, forming silt blockage, resulting in a decrease in mass transfer efficiency, the silt removal mechanism can be used to expand the packing cage layer by layer to provide the bulk packing with space for rising and tumbling. This allows lightweight bulk packing such as Raschig rings to spread and tumble in the packing cage under the action of the airflow. The spacing between bulk fillers is expanded, and mutual collision occurs, so that the sludge is separated from the bulk fillers, thereby restoring the normal exhaust gas separation and purification capacity; the present invention sets a connecting ring between adjacent filler cages, and the connecting ring has a guide slope and a collecting trough. Due to the wall flow effect, the sludge water in the upper filler cage will gradually flow toward the inner wall of the filler cage when flowing downward, and thus enter the collecting trough, greatly reducing or avoiding the sludge water from continuing to flow into the bulk filler of the lower layer; the present invention opens a silt discharge hole in the collecting trough, and designs a first sealing plate below the silt discharge hole. When the connecting ring moves upward, the silt discharge hole is separated from the first sealing plate, so that the silt is concentrated in the silt storage trough below, and can eventually be discharged from the tower body through the silt discharge pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 A three-dimensional diagram of the overall structure of an exhaust gas purification tower provided in an embodiment of the present invention.

[0017] Figure 2 A top view of an exhaust gas purification tower provided in an embodiment of the present invention.

[0018] Figure 3 for Figure 2 Cross-sectional view at AA in the middle.

[0019] Figure 4 for Figure 3 A partial enlarged view of point A in the middle.

[0020] Figure 5 for Figure 3 A partial enlarged view of point B in the middle.

[0021] Figure 6A three-dimensional diagram of multiple packing cages and connecting rings in an exhaust gas purification tower provided by an embodiment of the present invention.

[0022] Figure 7 A three-dimensional diagram of a single packing cage and a connecting ring in an exhaust gas purification tower provided in an embodiment of the present invention.

[0023] Figure 8 A schematic diagram of an exhaust gas purification tower in a desilting state provided by an embodiment of the present invention.

[0024] Figure 9 for Figure 8 A partial enlarged view of point C in the middle.

[0025] Description of reference numerals: 1. Tower body, 11. Air inlet pipe, 12. Air outlet pipe, 2. Filling cage, 21. Bottom plate, 22. Top plate, 23. Telescopic cylinder, 231. Inner cylinder, 232. Outer cylinder, 3. Liquid distribution device, 4. Connecting ring, 41. Collecting trough, 42. Guide slope, 43. Silt discharge hole, 44. First sealing plate, 45. Silt storage trough, 46. Bracket, 47. Fan blade, 5. Support part, 51. Second sealing plate, 6. Retaining ring, 7. First cylinder, 8. Second cylinder, 9. Silt discharge pipe. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] Example 1: like Figures 1 to 9 As shown, the first embodiment of the present invention provides a waste gas purification tower for purifying and separating dust and harmful components in the gas. The waste gas purification tower includes a cylindrical tower body 1, four filler cages 2 and a silt removal mechanism. Figure 3 As shown, the tower body 1 is a vertically arranged hollow columnar structure, with an air inlet pipe 11 on one side of the bottom and an air outlet pipe 12 on the top. The air inlet pipe 11 is used to introduce the exhaust gas to be purified, and the air outlet pipe 12 is used to discharge the purified gas.

[0028] Four packing cages 2 are distributed layer by layer from low to high along the axial direction of the tower body 1. Each packing cage 2 includes a bottom plate 21, a top plate 22 and a telescopic cylinder 23. Figure 4As shown, the telescopic cylinder 23 includes an inner cylinder 231 and an outer cylinder 232. The outer cylinder 232 is sleeved on the inner cylinder 231, and the two are connected in a sliding seal by a sealing ring. This can not only ensure the smooth expansion and contraction of the inner cylinder 231 and the outer cylinder 232, but also prevent gas leakage. The top plate 22 is fixed to the top of the outer cylinder 232, and the bottom plate 21 is fixed to the bottom of the inner cylinder 231. The top plate 22, the bottom plate 21 and the telescopic cylinder 23 form a complete stuffing cage 2, which has space inside to accommodate bulk filler. To ensure that the gas can flow smoothly from the bottom of the stuffing cage 2 to the top and pass through the stuffing cage 2, the bottom plate 21 and the top plate 22 are both provided with a breathable grid. The mesh of the breathable grid should be smaller than the bulk filler particles to prevent the bulk filler from leaking from the breathable grid. The bulk filler uses lightweight bulk fillers such as Raschig rings.

[0029] like Figure 4 As shown, when the packing cage 2 is in a compressed state, the bulk packing can fill the entire accommodating cavity, making the distance between particles smaller. Figures 3 to 6 As shown, a liquid distribution device 3 is provided at a position above the uppermost packing cage 2 at the top of the inner cavity of the tower body 1. The liquid distribution device 3 includes a water pipe connected to an external liquid supply device and a plurality of evenly distributed nozzles installed on the water pipe. The nozzles evenly spray absorption liquid toward the packing cage 2 below. The absorption liquid flows downward and forms a water film on the surface of the bulk packing in the four layers of packing cages 2 below. As a result, when the exhaust gas passes through the bulk packing, the dust and harmful gases are separated from the exhaust gas through gas-liquid mass transfer, thereby achieving purification of the exhaust gas.

[0030] In order to control the telescopic state of the telescopic cylinder 23 in the filling cage 2, the present invention designs a dredging mechanism in the tower body 1. The dredging mechanism is located between the filling cage 2 and the inner wall of the tower body 1. Its function is to drive the four telescopic cylinders 23 to extend and retract in sequence. Figure 3 and Figure 4As shown, a retaining ring 6 is fixed to the outer cylinder 232 of the topmost packing cage 2. The retaining ring 6 is in sliding and sealing connection with the inner wall of the tower body 1. This prevents gas from leaking between the packing cage 2 and the inner wall of the tower body 1, and allows gas to pass only through the packing cage 2. The desilting mechanism includes four lifting units, each used to drive the raising and lowering of the four outer cylinders 232 in the four packing cages 2. The inner cylinder 231 of the upper packing cage 2 is fixedly connected to the outer cylinder 232 of the lower packing cage 2. The inner cylinder 231 of the lowest packing cage 2 abuts against the annular support 5 fixed inside the tower. In order to ensure that the outer cylinder 232 remains stable when moving on the inner cylinder 231, each lifting unit includes at least two first cylinders 7 symmetrically distributed on both sides of the outer cylinder 232, and multiple first cylinders 7 are evenly distributed around the outer cylinder 232. The fixed end of each first cylinder 7 is fixedly connected to the inner wall of the tower body 1 through a base, and the other end is fixedly connected to the outer cylinder 232 through a connecting plate. The axial direction of the first cylinder 7 is parallel to the axial direction of the tower body 1. Through the telescopic action of the first cylinder 7, the lifting and lowering drive of the outer cylinder 232 is realized, thereby controlling the volume change of the filling cage 2.

[0031] After the exhaust gas enters the tower from the air inlet pipe 11, it can only pass through multiple packing cages 2 from bottom to top due to the presence of the retaining ring 6 and the support part 5. During this process, the exhaust gas is fully in contact with the absorption liquid, and the pollutants in it are absorbed and purified. The purified exhaust gas is discharged from the outlet pipe 12. When the sludge accumulated in the bulk packing causes the mass transfer efficiency to decrease, the lifting unit can gradually raise the outer cylinder 232 of the packing cage 2, thereby expanding the volume of the packing cage 2 and providing space for the bulk packing to rise and roll. Figure 9 As shown, the lightweight bulk filler is now dispersed and tumbled by the airflow, which not only increases the spacing between the bulk filler particles, making it easier for the sludge to escape, but also accelerates the sludge's release from the filler due to collisions between the bulk filler particles, thus completing the bulk filler desilting. The compressed state of the filler cage 2 is then restored, and the spacing between the bulk filler particles is reduced again, restoring normal exhaust gas purification capabilities.

[0032] Example 2: On the basis of the first embodiment, the present invention further provides four connecting rings 4 in the tower body 1, corresponding to the four filling cages 2 respectively. Figure 3 and Figure 4 As shown, the upper edges of the three connecting rings 4 are fixedly connected to the bottom edges of the inner cylinder 231 in the corresponding filling cage 2, while the lower edges of the connecting rings 4 are fixedly connected to the outer wall of the outer cylinder 232 of the lower filling cage 2. The connecting rings 4 are used to achieve fixed connection between adjacent filling cages 2. Figure 5As shown, the bottom edge of the inner cylinder 231 of the lowest packing cage 2 is fixed to the connecting ring 4 against the support portion 5. Because the connecting ring 4 seals and securely connects the inner cylinder 231 and outer cylinder 232 of two adjacent packing cages 2, the exhaust gas can only pass through the four packing cages 2 in sequence from bottom to top, thanks to the cooperation of the retaining ring 6 and the support portion 5.

[0033] The present invention provides a collection trough 41 for collecting sludge water on the connecting ring 4, and a diversion slope 42 is located at the top of the connecting ring 4. The airflow in the center of the tower body 1 is often stronger than that near the tower walls. Therefore, under the influence of the airflow, the absorbent liquid on the bulk packing experiences wall flow as it flows downward, concentrating toward the sidewalls of the packing cage 2. This allows sludge flowing down the inner wall of the inner cylinder 231 in the upper packing cage 2 to flow along the diversion slope 42 and into the collection trough 41, significantly reducing or preventing the sludge water from continuing to flow into the lower bulk packing, effectively preventing contamination of the lower packing by sludge from the upper packing.

[0034] In order to better complete the dredging and allow the sludge to flow into the collection tank 41, the present invention also provides a silt blocking mechanism under each filler cage 2. Figure 9 As shown, the silt-blocking mechanism includes a bracket 46 and a fan blade 47. The bracket 46 is fixed in the connecting ring 4 and is located between the two stuffing cages 2. The fan blade 47 is rotatably mounted on the bracket 46, and a waterproof motor for driving the fan blade 47 to rotate is installed on the bracket 46. After the above arrangement, when desilting the stuffing cage 2, the fan blade 47 can be driven to rotate. When the fan blade 47 rotates, an upward airflow will be generated to make up for the deficiency of the intake airflow below, and more strongly disturb the bulk filler in the upper stuffing cage 2, making the filler looser. The silt water falling from above falls on the fan blade 47. Under the action of centrifugal force, the silt is thrown to the inner wall of the connecting ring 4 and finally falls into the collection tank 41. This greatly reduces the possibility of silt accumulating on the lower stuffing cage 2, further improving the desilting effect.

[0035] Example 3: On the basis of the first and second embodiments, considering that the sludge in the collecting tank 41 will gradually be filled up, in order to conveniently clean the sludge, as shown in FIG. Figure 4 and Figure 9As shown, the present invention provides a plurality of drainage holes 43 at the bottom of the collecting trough 41 on each connecting ring 4, and a first annular sealing plate 44 is fixed to the connecting ring 4 located below the collecting trough 41 through a plurality of pillars. Since the connecting ring 4 is fixedly connected to the inner cylinder 231, the first sealing plate 44 is fixedly connected to the inner cylinder 231 through the connecting ring 4. In this way, when the stuffing cage 2 is in a compressed state, the first sealing plate 44 can block the drainage holes 43, thereby maintaining the sealed connection state between the connecting ring 4 and the upper and lower stuffing cages 2; and when the connecting ring 4 rises under the action of the lifting unit, the drainage holes 43 are separated from the first sealing plate 44, which allows the silt water in the collecting trough 41 to flow from the drainage holes 43 to the silt storage trough 45 formed by the support portion 5 below and the inner wall of the tower body 1.

[0036] like Figure 5 As shown, the bottom of the collection trough 41 of the lowest connecting ring 4 is also provided with a drainage hole 43, and a second sealing plate 51 is provided on the support portion 5 to cooperate with the drainage hole 43. In order to be able to drive the inner cylinder 231 in the lowest stuffing cage 2 to move upward, the present invention is provided with two second cylinders 8 on the inner wall of the tower body 1. The two second cylinders 8 are respectively located on both sides of the stuffing cage 2. One end of the second cylinder 8 is fixedly connected to the inner wall of the tower body 1 through a base, and the other end is fixedly connected to the lowest connecting ring 4 through a connecting plate. When the second cylinder 8 is extended, it can drive the connecting ring 4 to move upward, thereby separating the second sealing plate 51 from the drainage hole 43, so that the silt water in the lowest collection trough 41 can also be discharged into the silt storage tank 45.

[0037] A sludge discharge pipe 9 connected to the sludge storage tank 45 is fixed on the outer wall of the tower body 1. A valve is provided on the sludge discharge pipe 9 to facilitate regular discharge of sludge in the sludge storage tank 45 out of the tower.

[0038] During use, the exhaust gas enters the tower body 1 from the air inlet pipe 11, passes through four compressed packing cages 2, and is discharged from the air outlet pipe 12. The adsorbent liquid on the surface of the bulk particles in the packing cage 2 forms a water film, and the dust and harmful components in the exhaust gas dissolve in the water film, separating the dust from the airflow. When too much dust accumulates on the bulk particles, forming sludge, which blocks the airflow, the lifting units are activated from top to bottom to make the packing cage 2 enter the expansion state. At this time, the volume of the packing cage 2 increases, and the lightweight bulk packing has a larger flying space. Under the action of the fan blades 47 below, it churns and collides in the packing cage 2, causing the sludge to separate from the bulk packing and enter the collection tank 41. It finally passes through the silt storage tank 45 and is discharged from the silt discharge pipe 9, completing the silt removal of the bulk packing and restoring the purification capacity of the equipment.

[0039] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A waste gas purification tower, characterized in that: It includes a tower body, a plurality of filling cages and a dredging mechanism, wherein an air inlet pipe and an air outlet pipe are respectively provided on one side of the bottom and the top of the tower body; A plurality of the packing cages are arranged in the tower body and distributed layer by layer along the axial direction of the tower body. The packing cages include a bottom plate, a top plate and a telescopic cylinder. The bottom plate and the top plate are respectively arranged at the upper and lower ends of the telescopic cylinder and are both provided with air-permeable grids. The accommodating cavity formed by the bottom plate, the top plate and the telescopic cylinder is filled with bulk fillers. The desilting mechanism is arranged between the filling cage and the inner wall of the tower body, and is used to sequentially drive the telescopic cylinder to extend and retract; Among them, a liquid distribution device is installed above the top packing cage to spray absorption liquid to the packing cage below; after the exhaust gas enters the tower from the air inlet pipe, it passes through multiple packing cages from bottom to top in sequence and is discharged from the air outlet pipe.

2. The exhaust gas purification tower according to claim 1, characterized in that: The telescopic cylinder includes an inner cylinder and an outer cylinder. The outer cylinder is sleeved on the inner cylinder. The outer cylinder and the inner cylinder are slidably and sealedly connected via a sealing ring. The top plate is fixed to the top of the outer cylinder, and the bottom plate is fixed to the bottom of the inner cylinder.

3. The exhaust gas purification tower according to claim 2, characterized in that: A plurality of connecting rings are provided in the tower body, corresponding to a plurality of filling cages respectively, and a support portion is provided on the inner wall of the tower body below the lowest filling cage; the upper edge of the connecting ring is fixed to the bottom edge of the inner tube, and the lower edge of the connecting ring is fixed to the outer tube of the lower filling cage, and the lower edge of the connecting ring at the lowest position rests on the support portion.

4. The exhaust gas purification tower according to claim 3, characterized in that: The desilting mechanism includes a plurality of lifting units, which are arranged on the tower body and are respectively used to drive the plurality of outer cylinders to rise and fall; Among them, a retaining ring is fixed on the outer cylinder on the uppermost filling cage, and the retaining ring is slidingly and sealingly connected to the inner wall of the tower body. The multiple lifting units drive the multiple outer cylinders to move up or down in turn.

5. The exhaust gas purification tower according to claim 4, characterized in that: The lifting unit includes a plurality of first cylinders fixed in the tower body, and the plurality of first cylinders are evenly distributed around the outer cylinder. One end of the first cylinder is fixedly connected to the inner wall of the tower body, and the other end of the first cylinder is fixedly connected to the outer cylinder.

6. The exhaust gas purification tower according to claim 3, characterized in that: The connecting ring is provided with a collecting trough, and the top of the connecting ring is provided with a guide slope. The sludge in the filling cage flowing downward along the inner wall of the inner cylinder enters the collecting trough along the guide slope.

7. The exhaust gas purification tower according to claim 6, characterized in that: A silt discharge hole is provided at the bottom of the collecting tank, and a first sealing plate for sealing the silt discharge hole is fixedly connected to the inner cylinder. When the connecting ring rises, the silt discharge hole is separated from the first sealing plate, and the silt in the collecting tank flows from the silt discharge hole to the silt storage tank formed by the support part below and the inner wall of the tower body.

8. The exhaust gas purification tower according to claim 7, characterized in that: The support portion is provided with a second sealing plate that cooperates with the silt discharge hole on the lowest collection tank, and a plurality of second cylinders are provided on the inner wall of the tower body. One end of the second cylinder is fixedly connected to the inner wall of the tower body, and the other end is fixedly connected to the lowest connecting ring.

9. The exhaust gas purification tower according to claim 7, characterized in that: A silt discharge pipe communicating with the silt storage tank is provided on the outer wall of the tower body, and a valve is provided on the silt discharge pipe.

10. The exhaust gas purification tower according to claim 3, characterized in that: A silt blocking mechanism is provided below each of the packing cages, and the silt blocking mechanism includes a bracket fixed in the connecting ring and a fan blade rotatably mounted on the bracket. When the fan blade rotates, an upward airflow is generated, disturbing the bulk filler in the packing cage above and throwing the silt falling on the fan blade toward the inner wall of the connecting ring.

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