A high-efficiency exhaust gas purification system using nanomaterials
By using the wind pressure lifting and force transmission components in the high-efficiency exhaust gas purification system, the problems of waste and blockage of the nano-carbon felt layer caused by concentrated exhaust gas are solved, and the uniform distribution and efficient purification of exhaust gas are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- WUXI JINPENG ENVIRONMENTAL PROTECTION TECH CO LTD
- Filing Date
- 2025-06-10
- Publication Date
- 2026-05-08
AI Technical Summary
In existing technologies, exhaust gas passes directly through the nano-carbon felt layer, leading to waste at the edges of the nano-carbon felt layer and easy blockage in the central area after prolonged use.
A high-efficiency exhaust gas purification system is adopted, including an exhaust fan, an air inlet box, an elastic telescopic tube, a wind pressure lifting component, a force transmission component, and a switching component. Through the cooperation of the wind pressure lifting component and the switching component, the exhaust gas is evenly covered with the nano carbon felt layer. The force transmission component adjusts the force of the elastic telescopic tube to ensure that the amount of exhaust gas entering each pipe is basically the same.
This achieves uniform distribution of exhaust gas in the nano-carbon felt layer, reduces waste at the edges of the nano-carbon felt layer and blockage in the central area, and improves purification efficiency.
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Figure CN120605574B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of waste gas purification technology, and specifically to a high-efficiency waste gas purification system utilizing nanomaterials. Background Technology
[0002] Methods for purifying organic waste gas generally include adsorption, adsorption-regeneration, and absorption. Using nano-carbon felt to adsorb pollutants from waste gas falls under the category of adsorption. Nano-carbon felt itself possesses a high specific surface area and porous structure, enabling it to physically adsorb volatile organic compounds and particulate matter. Furthermore, the introduction of nanoscale structural units into the nano-carbon felt gives it a nanoscale structure. The introduction of carbon nanofibers, nanoparticles, or metal oxides significantly increases the adsorption sites and chemical activity of the carbon felt.
[0003] In a typical waste gas purification system utilizing nano-carbon felt layers, the process usually includes a waste gas introduction stage, a waste gas-nano-carbon felt contact stage, a regeneration and recovery stage, and a deep purification and emission stage. However, during the waste gas introduction stage, the waste gas cannot automatically and evenly cover the surface of the nano-carbon felt layer before passing through it. This results in the waste gas concentrating on passing through the nano-carbon felt layer, causing waste not only at the edges of the layer but also, over time, clogging of the central area after the waste gas passes through, further wasting the nano-carbon felt layer. Therefore, we propose a high-efficiency waste gas purification system utilizing nanomaterials to address these problems. Summary of the Invention
[0004] In view of the above-mentioned shortcomings of the existing technology, the purpose of this invention is to provide a high-efficiency exhaust gas purification system using nanomaterials, which solves the problem that in the existing technology, exhaust gas is concentrated through the nano-carbon felt layer, which not only causes waste at the edges of the nano-carbon felt layer, but also causes the central area of the nano-carbon felt to be easily blocked after long-term use.
[0005] Therefore, the present invention employs a high-efficiency exhaust gas purification system utilizing nanomaterials, characterized in that it comprises: an exhaust fan, an air inlet box fixedly disposed at the output end of the exhaust fan, two pipes (pipe 1) fixedly disposed at the output end of the air inlet box, a pipe (pipe 2) fixedly disposed at the end of pipe 1, a support seat fixedly disposed on pipe 2, an elastic telescopic tube disposed on the support seat, two switch assemblies disposed at the top of the elastic telescopic tube for opening and closing the air inlet box and pipe 2, a force transmission assembly disposed on pipe 2 for transmitting and comparing the forces of the two elastic telescopic tubes, a wind pressure lifting assembly disposed in pipe 2 for pushing up the elastic telescopic tube, and a spring disposed on the support seat for supporting the weight of the elastic telescopic tube.
[0006] The wind pressure lifting assembly includes a gear 1 that is rotatably disposed in the second pipe, a fan blade that is fixedly disposed at the end of the gear 1, and a rack 1 that moves through the second pipe.
[0007] The force transmission component includes a rack two fixedly disposed on one side of the top of the elastic telescopic tube and a gear two rotatably disposed on the top of the tube two.
[0008] A purification box is fixedly installed at the output end of the two tubes, and the purification box contains a nano carbon felt layer.
[0009] The bottom of the support base is fixedly connected to the support tube, and the bottom of the support tube is fixedly connected to the top of the second tube. The bottom of the elastic telescopic tube is fixedly connected to the top of the support tube.
[0010] The top of the elastic telescopic tube is a sealed top, and a connecting rod is fixedly installed on the top of the elastic telescopic tube. A vertical rod is fixedly installed on the support base. The vertical rod moves through the connecting rod, and the spring is movably sleeved on the vertical rod.
[0011] The rack and gear mesh with each other, and the end of the rack rests against the bottom of the connecting rod.
[0012] The switch assembly includes a limiting box 1 fixedly installed at the bottom of the connection between the air inlet box and the pipe 1, a limiting box 2 fixedly installed at the bottom of the inclined surface of the pipe 2, a baffle 1 that can be movably inserted into the limiting box 1, and a baffle 2 that can be movably inserted into the limiting box 2.
[0013] The first baffle and the second baffle are fixedly mounted on the connecting rod, and the support rod of the first baffle moves through the first limiting box, and the support rod of the second baffle moves through the second tube.
[0014] The second gear and the second rack mesh with each other. A second bearing is fixedly passed through the second gear. A third rod is fixedly passed through the inner ring of the second bearing. The third rod is fixedly mounted on the second tube.
[0015] Furthermore, one end of the gear has a rod two, which is fixedly passed through the inner ring of the bearing one, and the outer ring of the bearing one is fixedly disposed at the bottom of the inner wall of the tube two.
[0016] Furthermore, a limiting sleeve is fixedly provided at the top of the second tube, and the first rack moves through the limiting sleeve.
[0017] Compared with the prior art, the beneficial effects of the present invention are:
[0018] 1. As the exhaust gas passes through the elastic telescopic tube, the switching assembly effectively blocks the air inlets of the air inlet box and the second tube. As the exhaust gas impacts the elastic telescopic tube, baffle one moves up and down in the air inlet box, blocking it. Baffle two moves up and down in the second tube, blocking it as well. The wind pressure lifting assembly converts the impact force of the exhaust gas in the latter half of the second tube into a force that pushes the elastic telescopic tube upwards. The exhaust gas then drives the fan blades, gear one, and rack one to move together, allowing rack one to lift the elastic telescopic tube. Through the force of the exhaust gas, and the cooperation of the elastic telescopic tube, the wind pressure lifting assembly, and the switching assembly, the elastic telescopic tube has more force to move up and down. Ultimately, when the exhaust gas passes through the nano-carbon felt layer, it covers its surface more evenly, effectively reducing waste at the edges of the nano-carbon felt layer. After long-term use, the nano-carbon felt layer is less likely to become clogged in one place.
[0019] Second, the force transmission component effectively transfers force between the two elastic telescopic tubes. The elastic telescopic tube with a greater upward force will, through the transmission component, cause the elastic telescopic tube with a smaller upward force to generate a downward force. This causes the baffles on tubes 1 and 2, which have less air intake, to open more fully, facilitating the entry of more exhaust gas. Conversely, the baffles on tubes 1 and 2, which have more air intake, will close more fully, resulting in less exhaust gas entering. This achieves the effect of ensuring that the amount of exhaust gas entering each tube is basically the same, resulting in uniform exhaust. This allows for more thorough purification of the exhaust gas through the nano-carbon felt layer, and the spring helps to support the elastic telescopic tubes against gravity. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.
[0021] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;
[0022] Figure 2 This is a partial exploded cross-section diagram of the present invention;
[0023] Figure 3 This is a partial three-dimensional schematic diagram of the present invention;
[0024] Figure 4 This is a partial three-dimensional schematic diagram of the present invention;
[0025] Figure 5 This is a partial three-dimensional schematic diagram of the present invention;
[0026] Figure 6 This is a partial exploded view of the present invention;
[0027] Figure 7 This is a partial three-dimensional schematic diagram of the present invention;
[0028] Figure 8 This is a partial three-dimensional schematic diagram of the present invention.
[0029] Reference numerals in the attached diagram: 1. Elastic telescopic tube; 2. Air inlet box; 3. Pipe 1; 4. Pipe 2; 5. Purification box; 6. Nano-carbon felt layer; 7. Wind pressure lifting assembly; 71. Gear 1; 72. Fan blade; 73. Rack 1; 74. Bearing 1; 8. Switch assembly; 81. Limit box 1; 82. Limit box 2; 83. Baffle 1; 84. Baffle 2; 85. Limit sleeve; 9. Force transmission assembly; 91. Gear 2; 92. Rack 2; 93. Bearing 2; 10. Exhaust fan; 11. Support base; 12. Support tube; 13. Connecting rod; 14. Vertical rod; 15. Spring. Detailed Implementation
[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.
[0031] The present invention will be further described below with reference to embodiments.
[0032] Example 1, refer to Appendix Figure 1-8In this embodiment, to address the problem in the prior art where exhaust gas concentrates through the nano-carbon felt layer, resulting in waste at the edges of the nano-carbon felt layer and, after prolonged use, blockage in the central area of the nano-carbon felt layer due to the passage of exhaust gas, this invention discloses a high-efficiency exhaust gas purification system utilizing nanomaterials. The system includes: an exhaust fan 10, an air inlet box 2 fixedly mounted at the output end of the exhaust fan 10, two pipes 3 fixedly mounted at the output end of the air inlet box 2, a second pipe 4 fixedly mounted at the end of the first pipe 3, a support base 11 fixedly mounted on the second pipe 4, an elastic telescopic tube 1 mounted on the support base 11, and a device for spraying air onto the top of the elastic telescopic tube 1. The system includes two switch assemblies 8 for opening and closing the air intake box 2 and the second tube 4, a force transmission assembly 9 on the second tube 4 for transmitting and comparing the forces of the two elastic telescopic tubes 1, a wind pressure lifting assembly 7 in the second tube 4 for pushing the elastic telescopic tube 1 upwards, and a spring 15 on the support base 11 for supporting the weight of the elastic telescopic tube 1. The wind pressure lifting assembly 7 includes a gear 71 rotatably mounted in the second tube 4, a fan blade 72 fixedly mounted at the end of the gear 71, and a rack 73 that moves through the second tube 4. The force transmission assembly 9 includes a rack 92 fixedly mounted on one side of the top of the elastic telescopic tube 1 and a gear 91 rotatably mounted on the top of the second tube 4. The support base 11 has four rods for limiting the movement of the elastic telescopic tube 1. When the spring 15 supports the weight of the elastic telescopic tube 1, both the baffle 83 blocking the first tube 3 and the baffle 84 blocking the second tube 4 are in a semi-obstructed state. As the exhaust gas passes through the elastic telescopic tube 1, the switching assembly 8 effectively blocks the air inlets of the air inlet box 2 and the second tube 4. As the exhaust gas impacts the elastic telescopic tube 1, baffle 1 83 moves up and down within the air inlet box 2, blocking it. Baffle 2 84 moves up and down within the second tube 4, also blocking it. The wind pressure lifting assembly 7 converts the impact force of the exhaust gas in the latter half of the second tube 4 into a force that pushes the elastic telescopic tube 1 upwards. The exhaust gas then drives the fan blade 72, gear 1 71, and rack 1 73 in a coordinated manner, allowing rack 1 73 to lift the elastic telescopic tube 1. Through the force of the exhaust gas, and the coordination of the elastic telescopic tube 1, the wind pressure lifting assembly 7, and the switching assembly 8, the elastic telescopic tube 1 gains more force to move up and down. The undulations, through the force transmission component 9, transmit the force to the two elastic telescopic tubes 1. The elastic telescopic tube 1 with a larger upward force will, through the transmission component 9, cause the elastic telescopic tube 1 with a smaller upward force to generate a downward force. This causes the baffles 83 and 84 on the tubes 3 and 4 with less air intake to open more fully, facilitating the entry of more exhaust gas. Conversely, the baffles 83 and 84 on the tubes 3 and 4 with more air intake will close more fully, resulting in less exhaust gas entering. This achieves the effect of achieving a basically the same amount of exhaust gas entering each tube 4, resulting in uniform exhaust. This allows for more thorough purification of the exhaust gas through the nano-carbon felt layer 6. The spring 15 helps to lift the elastic telescopic tube 1 to withstand the gravity.
[0033] A purification box 5 is fixedly installed at the output end of the two tubes 4. The purification box 5 contains a nano-carbon felt layer 6. The exhaust gas entering through the tubes 4 in the purification box 5 is purified, allowing the exhaust gas in the tubes 4 to enter the purification box 5 evenly.
[0034] The bottom of the support base 11 is fixedly connected to the support tube 12, and the bottom of the support tube 12 is fixedly connected to the top of the second tube 4. The bottom of the elastic telescopic tube 1 is fixedly connected to the top of the support tube 12. The support tube 12 and the second tube 4 are fixedly connected to each other, which makes it easy to fix the support base 11.
[0035] The top of the elastic telescopic tube 1 is sealed, and a connecting rod 13 is fixedly installed on the top of the elastic telescopic tube 1. A vertical rod 14 is fixedly installed on the support base 11. The vertical rod 14 moves through the connecting rod 13, and the spring 15 is movably sleeved on the vertical rod 14. The connecting rod 13 facilitates the connection between the second baffle 84 and the first baffle 83, and allows the vertical rod 14 to pass through the connecting rod 13 to limit the movement of the spring 15.
[0036] Rack 73 meshes with gear 71, with the end of rack 73 resting against the bottom of connecting rod 13. Exhaust gas passing through pipe 4 drives fan blade 72 and gear 71 to rotate, which in turn pushes rack 73 upwards, effectively lifting connecting rod 13 and elastic telescopic tube 1.
[0037] Gear 71 has a rod 2 at its end, which passes through the inner ring of bearing 74. The outer ring of bearing 74 is fixedly located at the bottom of the inner wall of tube 4. The rod 2 at the end of gear 71 facilitates the fixation of bearing 74 and limits the movement of gear 71. The part of tube 4 that contacts rack 73 is a circular tube, allowing for more complete contact between fan blade 72 and exhaust gas, thus transmitting the force of the exhaust gas. Gear 71 has a rod 2 at its end, which passes through the inner ring of bearing 74. The outer ring of bearing 74 is fixedly located at the bottom of the inner wall of tube 4.
[0038] Example 2, see attached document Figure 1-8In this embodiment, in order to solve the problem that in the prior art, the waste gas concentrated through the nano-carbon felt layer not only causes waste at the edge of the nano-carbon felt layer, but also causes the central area of the nano-carbon felt to be easily blocked after long-term use, based on the same concept as the above embodiment one, this high-efficiency waste gas purification system using nanomaterials further includes: the switch assembly 8 includes a limiting box 81 fixedly set at the bottom of the connection between the air inlet box 2 and the pipe 3, a limiting box 82 fixedly set at the bottom of the inclined surface of the pipe 4, a baffle 83 that is movably inserted into the limiting box 81, and a baffle 84 that is movably inserted into the limiting box 82. The baffle 83 and the baffle 84 are fixedly set on the connecting rod 13, and the support rod of the baffle 83 moves through the limiting box 81, and the support rod of the baffle 84 moves through the pipe 4. The spring 15 helps to lift the elastic telescopic tube 1 to withstand the weight. The elastic telescopic tube 1 is subjected to the force of baffle 1 83 and baffle 2 84, which is counteracted by the spring 15. When the exhaust gas does not enter the air intake box 2, baffle 1 83 and baffle 2 84 are raised to the height of blocking half of the air intake of the air intake box 2 and the second pipe 4 under the action of the spring 15. This allows the baffle 1 83 and baffle 2 84 to move up and down when exhaust gas enters each pipe 1 3 and pipe 2 4, so as to better adjust the amount of exhaust gas entering the pipe 1 3 and pipe 2 4 and make it evenly enter the air.
[0039] Gear 2 91 and rack 2 92 mesh with each other. Through the meshing of gear 2 91 and one or both racks 2 92, the force on the two elastic telescopic tubes 1 can be transmitted. The elastic telescopic tube 1 with greater force will transmit a reverse downward force to the elastic telescopic tube 1 with less force, thereby achieving uniform adjustment of the opening degree of baffle 1 83 and baffle 2 84. The elastic telescopic tube 1 with less force is pressed down more, so baffle 1 83 and baffle 2 84 are opened more, and the air intake will increase. The elastic telescopic tube 1 with greater force is raised more, so baffle 1 83 and baffle 2 84 are opened less, and the air intake will decrease.
[0040] A bearing 93 is fixedly passed through the gear 2 91, and a rod 3 is fixedly passed through the inner ring of the bearing 2 93. The rod 3 is fixedly mounted on the tube 2 4. The bearing 2 93 and the rod 3 facilitate the limiting of the gear 2 91, and facilitate the transmission of the force of the elastic telescopic tube 1 between the rack 2 92 and the gear 2 91, reducing force loss.
[0041] A limiting sleeve 85 is fixedly installed at the top of tube 2 4, and rack 1 73 moves through the limiting sleeve 85. The limiting sleeve 85 can better limit the up and down movement of rack 1 73.
[0042] Working principle: Spring 15 supports the elastic telescopic tube 1 against gravity. Baffle 1 (83) partially blocks tube 3 and baffle 2 (84) partially blocks tube 4. Exhaust gas is drawn into the intake box 2, tube 3, tube 2 (4), and purification box 5 by the exhaust fan 10. The exhaust gas is then discharged from the two tubes 2 (4) into the nano-carbon felt layer 6, thus purifying the exhaust gas. When the exhaust gas passes through the partially blocked tube 3 (baffle 1 (83) and then the partially blocked tube 2 (84), it pushes the elastic telescopic tube 1 upwards. The question is which of the two tubes 2 (4) experiences the most pressure on the elastic telescopic tube 1. The greater the lifting force, the more the elastic telescopic tube 1 can rise, which means more exhaust gas enters the intake box 2 and pipe 4 connected to the elastic telescopic tube 1. Furthermore, the fan blade 72 in the latter half of pipe 4 drives gear 71 to rotate, causing rack 73 to rise, further generating a force to lift the elastic telescopic tube 1. The elastic telescopic tube 1 with a greater lifting force transmits the force through the meshing of gear 91 and rack 92, causing the elastic telescopic tube 1 with a smaller lifting force to generate a downward force. At this point, two situations may occur:
[0043] S1. The elastic telescopic tube 1 with a large lifting force has a large air intake volume in tubes 3 and 4. Therefore, the elastic telescopic tube 1 with a large lifting force will push the baffles 83 and 84 on the air intake box 2 connected to the elastic telescopic tube 1 to lift up, further sealing tubes 3 and 4. This will reduce the air intake volume in tube 3. The lifting of baffle 84 in tube 4 will further reduce the air intake volume in the latter half of tube 4, making the air reduction effect more obvious. This will reduce the force on the elastic telescopic tube 1, reduce the impact of exhaust gas on the fan blade 72, and reduce the lifting force of rack 73. Through the transmission of gear 91 and rack 92, it will drive the air intake volume of other tubes 3 and 4 to increase, achieving the effect of continuously and automatically adjusting the uniform air intake of the two sets of tubes 3 and 4 at different time periods.
[0044] S2. The air intake of pipes 3 and 4 on the elastic telescopic pipe 1 with a small lifting force is small. Therefore, the elastic telescopic pipe 1 with a small lifting force will generate a downward force under the action of the elastic telescopic pipe 1 with a larger lifting force through the action of gear 91 and rack 92. This will cause the baffles 83 and 84 on the air intake box 2 connected to the elastic telescopic pipe 1 with a small lifting force to press down, further opening pipes 3 and 4. This will increase the amount of exhaust gas entering pipes 3 and 4. The downward pressing of baffle 84 in pipe 4 will further increase the air intake of the latter half of pipe 4, making the air enhancement effect more obvious. This will increase the force on the elastic telescopic pipe 1, increase the impact of exhaust gas on the fan blade 72, and increase the lifting force of rack 73. Through the transmission of gear 91 and rack 92, it will also drive the air intake of other pipes 3 and 4 to decrease, achieving the effect of continuously and automatically adjusting the two sets of pipes 3 and 4 to uniformly intake air at different time periods.
[0045] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.
Claims
1. A high-efficiency waste gas purification system utilizing nanomaterials, characterized in that, include: The exhaust fan (10), the air inlet box (2) fixedly installed at the output end of the exhaust fan (10), the two pipes (3) fixedly installed at the output end of the air inlet box (2), the pipe (4) fixedly installed at the end of the pipe (3), the support seat (11) fixedly installed on the pipe (4), the elastic telescopic tube (1) installed on the support seat (11), the two switch components (8) installed on the top of the elastic telescopic tube (1) for opening and closing the air inlet box (2) and the pipe (4), the force transmission component (9) installed on the pipe (4) for transmitting and comparing the force of the two elastic telescopic tubes (1), the wind pressure lifting component (7) installed in the pipe (4) for pushing the elastic telescopic tube (1) upward, and the spring (15) installed on the support seat (11) for supporting the weight of the elastic telescopic tube (1). The wind pressure lifting assembly (7) includes a gear (71) rotatably disposed in the second pipe (4), a fan blade (72) fixedly disposed at the end of the gear (71), and a rack (73) movably passing through the second pipe (4). The force transmission component (9) includes a rack two (92) fixedly disposed on one side of the top of the elastic telescopic tube (1) and a gear two (91) rotatably disposed on the top of the tube two (4). A purification box (5) is fixedly installed at the output end of the two tubes (4), and the purification box (5) has a nano carbon felt layer (6). The bottom of the support base (11) is fixedly connected to the support tube (12), and the bottom of the support tube (12) is fixedly connected to the top of the tube (4). The bottom of the elastic telescopic tube (1) is fixedly connected to the top of the support tube (12). The top of the elastic telescopic tube (1) is a sealed top. A connecting rod (13) is fixedly installed on the top of the elastic telescopic tube (1). A vertical rod (14) is fixedly installed on the support base (11). The vertical rod (14) moves through the connecting rod (13). The spring (15) is movably sleeved on the vertical rod (14). The rack (73) meshes with the gear (71), and the end of the rack (73) rests against the bottom of the connecting rod (13). The switch assembly (8) includes a limiting box 1 (81) fixedly disposed at the bottom of the connection between the air inlet box (2) and the pipe 1 (3), a limiting box 2 (82) fixedly disposed at the bottom of the inclined surface of the pipe 2 (4), a baffle 1 (83) that can be inserted into the limiting box 1 (81), and a baffle 2 (84) that can be inserted into the limiting box 2 (82). The first baffle (83) and the second baffle (84) are fixedly mounted on the connecting rod (13), and the support rod of the first baffle (83) moves through the first limiting box (81), and the support rod of the second baffle (84) moves through the second tube (4). The gear two (91) and the rack two (92) mesh with each other. A bearing two (93) is fixedly passed through the gear two (91). A rod three is fixedly passed through the inner ring of the bearing two (93). The rod three is fixedly mounted on the tube two (4).
2. The high-efficiency waste gas purification system utilizing nanomaterials according to claim 1, characterized in that, The gear one (71) has a rod two at its end, which is fixedly passed through the inner ring of the bearing one (74), and the outer ring of the bearing one (74) is fixedly set at the bottom of the inner wall of the tube two (4).
3. The high-efficiency waste gas purification system utilizing nanomaterials according to claim 2, characterized in that, A limiting sleeve (85) is fixedly installed at the top of the second tube (4), and the first rack (73) moves through the limiting sleeve (85).
Citation Information
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