CN217855426U - Waste gas treatment device with small air volume - Google Patents
Waste gas treatment device with small air volume Download PDFInfo
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- CN217855426U CN217855426U CN202221043729.3U CN202221043729U CN217855426U CN 217855426 U CN217855426 U CN 217855426U CN 202221043729 U CN202221043729 U CN 202221043729U CN 217855426 U CN217855426 U CN 217855426U
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Abstract
The utility model relates to a small-air-volume waste gas treatment device, which comprises a treatment device body, wherein an absorption system I and an absorption system II which are connected through an induced air channel are also arranged in the treatment device body, a plurality of air inlets are arranged on the absorption system I, and an air outlet is arranged on the absorption system II; the absorption system I and the absorption system II respectively adopt a hollow tower absorption type and a packing absorption type, the absorption system I and the absorption system II are respectively provided with a spraying mechanism, the absorption system II is internally provided with a packing layer positioned below the spraying mechanism, an air outlet of the induced air channel is positioned on the upper part of the packing layer, a converging exhaust part positioned below the packing layer is arranged on an air outlet, and the air inlet pipeline is also connected with a branch spraying pipe. The utility model provides a waste gas treatment device with small air quantity, which can promote the orderly circulation and purification of air flow.
Description
Technical Field
The utility model relates to an environmental protection field, concretely relates to exhaust treatment device especially relates to an exhaust treatment device of little amount of wind.
Background
With the rapid development of the industries of electronic semiconductors, liquid crystals, solar energy and the like, the production and manufacturing processes thereof are based on the requirements of the manufacturing processes thereof, such as: since PECVD, ICP, ITO, TFT, etc. are cleaned, etched, coated, etc. using some acid-base reagents, exhaust gas and special gas exhaust gas with small air volume are generated from the machine, and these exhaust gases are characterized by high concentration of acid-containing and alkali-containing exhaust gas and small air volume (generally less than 1000 m) 3 And/h) the waste gas treatment system contains a small amount of dust, the waste gas treatment system is generally arranged near the machine platform, and the gas flow is in an unordered state due to small gas flow. Meanwhile, the purification equipment in the prior art is not convenient for purifying the air inlet pipeline. Therefore, it is not suitable to use the conventional washing system. Such gases need to be treated from the structure and principle of the treatment apparatus. Therefore, there is a need for a small-volume exhaust gas treatment device that promotes the orderly flow-through purification of the gas stream.
SUMMERY OF THE UTILITY MODEL
The utility model overcomes prior art's is not enough, provides a waste gas treatment device of the little amount of wind that can make the orderly circulation of air current purify.
In order to achieve the above purpose, the utility model adopts the technical scheme that: a small-air-volume waste gas treatment device comprises a treatment device body, wherein an absorption system I and an absorption system II which are connected through an induced air channel are also arranged in the treatment device body, a plurality of air inlets are formed in the absorption system I, and an air outlet is formed in the absorption system II; the absorption system I and the absorption system II are respectively provided with a spraying mechanism, the absorption system II is internally provided with a packing layer positioned below the spraying mechanism, an air outlet of the induced air channel is positioned on the upper part of the packing layer, a converging exhaust part positioned below the packing layer is arranged on the air outlet, the converging exhaust part comprises a converging cover arranged below the packing layer, and the upper part of the converging cover is provided with a guide pipe leading to the outside of the treatment device body.
In a preferred embodiment of the present invention, the inlet pipe is further connected to a branch shower pipe.
In a preferred embodiment of the present invention, the collecting cover has a circular structure with an inlet facing downward and an outlet facing upward, one end of the flow guide pipe is connected to the outlet, and the other end of the flow guide pipe is led out of the treatment device body after passing through the gas outlet.
In a preferred embodiment of the present invention, the absorption system and the absorption system are of a hollow tower absorption type and a packed absorption type respectively; the lower part in the absorption system is a first circulating water tank, the air inlet is positioned above the first circulating water tank, and the spraying mechanism of the absorption system is positioned above the air inlet; the lower part in the absorption system II is a circulating water tank II, and the confluence exhaust part is positioned at the upper part of the circulating water tank II; the treatment device body is also connected with a dosing pipeline, a water replenishing pipeline and a water draining pipeline.
In a preferred embodiment of the present invention, the first absorption system and the second absorption system are absorption chambers separated by a partition board in the inner chamber of the processing apparatus body; the air inducing channel penetrates through the upper part of the partition plate, and a through hole is formed in the lower part of the partition plate; the first circulating water tank and the second circulating water tank are communicated through a through hole in the partition plate, and the first circulating water tank and the second circulating water tank are connected with the spraying mechanism through a circulating pipeline of the circulating water feeding mechanism and a circulating water pump.
In a preferred embodiment of the present invention, the spraying mechanism of the absorption system comprises a plurality of spray heads disposed in the absorption system, and the spraying direction of the spray heads is upward.
In a preferred embodiment of the present invention, the spraying mechanism of the second absorption system comprises a plurality of spraying heads disposed in the second absorption system, and the spraying direction of the spraying heads is downward and is opposite to the packing layer.
The utility model discloses a preferred embodiment, the admission line includes inlet manifold one and inlet manifold two that are connected with the air inlet, is connected with branch shower respectively on inlet manifold one and the inlet manifold two, and branch shower is connected with circulation water feeding mechanism.
In a preferred embodiment of the present invention, the water circulating and feeding mechanism further comprises a Y-shaped filter connected to the water circulating pump.
In a preferred embodiment of the present invention, the packing layer is one or more of packing with longitudinal holes, taylor rosette, pall ring packing.
In a preferred embodiment of the present invention, the flow guiding pipe is a folded pipe or a bent pipe structure, and the inlet of the flow guiding pipe faces downward and the outlet of the flow guiding pipe faces upward; or/and an anti-overflow groove is arranged at the lower part of the treatment device body, and the lower parts of the first absorption system and the second absorption system are positioned in the anti-overflow groove.
The utility model provides a defect that exists among the background art, the beneficial effect of the utility model:
the utility model provides a can make the ordered circulation of air current purify's exhaust treatment device of the little amount of wind, have compact structure, equipment configuration simple, can have high-efficient, stable purifying effect to little amount of wind waste gas, space utilization is high.
1. The converging exhaust part is arranged, and a flow guide pipe leading to the outside of the treatment device body is arranged at the upper part of the converging cover through the converging cover arranged below the packing layer in the converging exhaust part. Utilize being that of collecting the cover and being entry down, export round structure that turns to from the top, can change the flow direction of air current at first for unordered air current is more orderly originally, and on the other hand collects the liquid landing that the structure of cover is convenient for spray and collects to circulation tank two in, and the structure setting of honeycomb duct has also effectively prevented to spray liquid and has been taken over by the air current.
2. The air inlet pipeline is also connected with a branch spray pipe, the air inlet pipeline comprises a first air inlet branch pipe and a second air inlet branch pipe, the first air inlet branch pipe and the second air inlet branch pipe are connected with branch spray pipes respectively, and the branch spray pipes are connected with the circulating water feeding mechanism. The branch shower can clean inlet channel, and the branch shower sprays in inlet channel's liquid can tentatively purify the gas of introducing, the dust fall in addition.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic front view of the preferred embodiment of the present invention;
FIG. 2 is a schematic side view of the preferred embodiment of the present invention;
fig. 3 is a schematic top view of the preferred embodiment of the present invention;
fig. 4 is a schematic diagram of the system structure of the preferred embodiment of the present invention;
FIG. 5 is a schematic structural view of the preferred embodiment of the present invention with a schematic airflow direction;
wherein, 1-an air inlet pipeline, 10-a clapboard, 11-a first air inlet branch pipe, 12-a second air inlet branch pipe, 13-a branch spray pipe, 20-a treatment device body, 2-an absorption system, 21-a first circulating water tank, 211-an overflow liquid level detector, 22-a circulating water pump, 23-a circulating pipeline, 24-a first spray mechanism, 3-a diversion channel, 4-a second absorption system, 41-a second circulating water tank, 42-a packing layer, 43-a second spray mechanism, 44-a through hole, 45-a quick electric water adding pipeline, 46-a water supplementing pipeline, 47-a medicine adding pipeline, 471-a liquid level monitor, 48-a water drainage pipeline, 481-a waste discharge port, 482-an empty tower bottom water discharge pipe, 483-a packing sewage discharge pipe, 5-an air outlet, 50-a mounting bracket, 51-a collecting cover, 52-a flow guide pipe, 6-an anti-overflow groove, 7-a control box, 8-a clapboard and 9-a maintenance port; a-medicament, B-water and C-airflow direction.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings, which are simplified and are only schematic illustrations of the basic structure of the invention, and the embodiments thereof, and which therefore only show the constructions associated with the invention.
Example one
As shown in fig. 1 to 3, a small-air-volume exhaust gas treatment device includes a treatment device body 20, a hollow tower absorption type absorption system 2 and a filler absorption type absorption system two 4 connected by an induced air channel 3 are further disposed in the treatment device body 20, and the absorption system 2 and the absorption system two 4 are two absorption cavities formed in an inner cavity of the treatment device body 20 by a partition plate 8 in a partitioned manner; the absorption system 2 is provided with an air inlet, the absorption system II 4 is provided with an air outlet 5, the induced air channel 3 penetrates through the upper part of the partition plate 8, and the air outlet of the absorption system 2 is positioned above the partition plate 8 between the absorption system I2 and the absorption system II 4, so that the air can be conveniently discharged. And the second air outlet of the second-stage absorption system is positioned at the middle lower part of the second-stage absorption system, so that the gas after absorption can be conveniently discharged. The treatment device body 20 is also connected with a dosing pipeline 47, a water replenishing pipeline 46, a rapid electric water adding pipeline 45 and a water discharging pipeline 48. The water supply pipeline 46 and the quick electric water supply pipeline 45 have the same water supply principle and are communicated in structure, and water supply is carried out through a water supply pump and a pipeline. The fast electric water-adding pipe 45 is used for the condition of supplementing a large amount of water after the washing system is initially started or stopped for maintenance, and the water-supplementing pipe 46 is used for the condition of supplementing a small amount of water through liquid level control in the normal operation of the washing system. The processing device body 20 is also provided with a maintenance port 99 and a window, so that the internal condition of the equipment can be observed at any time, and the equipment can be maintained and overhauled conveniently. The overflow preventing groove 6 is provided at the lower part of the treating apparatus body 20. The drainage pipe 48 comprises a waste discharge opening 481 arranged on the overflow preventing groove 6, an empty tower bottom drainage pipe 482 of the absorption system 2 and a filler drainage pipe 483 of the absorption system II 4. The lower parts of the absorption system 2 and the absorption system two 4 are positioned in the anti-overflow groove 6. The overflow prevention tank 6 can prevent liquid leaked from equipment or pipelines from corroding peripheral foundations, avoid potential safety hazards, ensure horizontal installation of the washing tower and have a bearing effect, so that the whole absorption system becomes modular equipment with a compact structure.
The lower part in the absorption system 2 is a circulating water tank I21, a spraying mechanism I24 in the absorption system 2 is positioned above the circulating water tank I21 and the air inlet, and the air inlet is positioned above the circulating water tank; the first spraying mechanism 24 of the absorption system 2 comprises a plurality of spraying heads arranged in the absorption system 2, and the spraying direction of the spraying heads is upward. The lower part in the absorption system II 4 is a circulating water tank II 41, and a spraying mechanism II 43 positioned above the circulating water tank I21 is arranged in the absorption system II 4; a filler layer 42 is also arranged between the second circulating water tank 41 of the second absorption system 4 and the second spraying mechanism 43; the second spraying mechanism 43 of the second absorption system 4 comprises a plurality of spraying heads arranged in the second absorption system 4, and the spraying direction of the spraying heads is downward and is opposite to the packing layer 42. And the air outlet of the induced air channel 3 is positioned at the upper part of the packing layer 42, the air outlet 5 is provided with a converging exhaust part embedded in the absorption system II 4, the converging exhaust parts are respectively positioned at the upper parts of the circulating water tank II 41, the converging exhaust part comprises a converging cover 51 arranged below the packing layer 42, the converging cover 51 is of a circular structure with a downward inlet and an upward outlet, one end of a flow guide pipe 52 is connected with the outlet, and the other end of the flow guide pipe 52 penetrates through the air outlet 5 and then is led out of the treatment device body 20. The draft tube 52 is a folded or bent tube structure, and the inlet of the draft tube 52 faces downward and the outlet faces upward. Further, the filler layer 42 is made of a filler with longitudinal pores, and may be one of a taylor flower ring, a pall ring and the like.
The lower part of the clapboard 8 is provided with a through hole 44; the first circulating water tank 21 and the second circulating water tank 41 are communicated through a through hole 44 in the partition plate 8, and the first circulating water tank 21 and the second circulating water tank 41 are respectively connected with the first spraying mechanism 24 and the second spraying mechanism 43 through a circulating pipeline 23 of the circulating water feeding mechanism and a circulating water pump 22.
The airflow direction C is as shown in fig. 5, the waste gas or tail gas from the machine table firstly enters the absorption system 2 from the first air inlet branch pipe 11 or the second air inlet branch pipe 12 from bottom to top through the air inlet pipeline and is in countercurrent contact with a large amount of circulating liquid reversely sprayed by the first spraying mechanism 24, dust in the waste gas is captured, and simultaneously the dust and acidic or alkaline pollutants in the waste gas are subjected to neutralization reaction to carry out chemical absorption, the waste gas absorbed by the absorption system 2 enters the absorption system two 4 from top to bottom through the first air outlet of the absorption system 2 and is fully contacted with the circulating liquid with the agent a sprayed by the second spraying mechanism 43 in the packing layer 42 for carrying out chemical absorption again. The absorption system 2 is empty tower absorption, so that the filler can be prevented from being blocked by particulate matters in the waste gas; the second absorption system 4 is a packed tower for absorption, the gas treated by the first absorption system 2 enters the second absorption system 4, and a packing layer 42 is arranged inside the second absorption system 4 to provide sufficient contact area for gas-liquid contact and increase contact time, so that efficient absorption is ensured.
Example two
As shown in fig. 1 to 3, an air inlet pipeline of the small air volume exhaust gas treatment device based on the first embodiment includes a first air inlet branch pipe 11 and a second air inlet branch pipe 12 connected to an air inlet, and the first air inlet branch pipe 11 and the second air inlet branch pipe 12 are respectively connected to a branch shower pipe 13, so as to facilitate online cleaning. The branch spray pipes 13 are connected with the circulating water feeding mechanism, and the branch spray pipes 13 are arranged on the first air inlet branch pipe 11 and the second air inlet branch pipe 12 and adopt tangential spraying. When one of the air inlet pipelines needs to be maintained, the other air inlet pipeline can be automatically switched to, and the continuous operation of the waste gas treatment device with small air volume is ensured. The spraying mode that the branch spraying pipes 13 are arranged in the first air inlet branch pipe 11 and the second air inlet branch pipe 12 is tangential spraying, so that high-temperature flue gas to be treated can be cooled, and dust in normal-temperature dust-containing waste gas can be collected; but also the preliminary absorption soluble pollutant in the waste gas, also can be used to the washing of pipeline, prevent that the particulate matter in the flue gas from gathering the circulation that influences the air current on the pipeline, increase the pipeline pressure loss, influence the life of pipeline.
Furthermore, Y-shaped filters are arranged on pipelines for spraying the branch pipes and are used for filtering particles in the circulating liquid. The waste gas treatment device with small air volume has small air volume (generally 1000 m) for treating waste gas 3 And the size of the air inlet pipe is smaller, and because the waste gas contains dust, the tangential spraying system is arranged on each air inlet pipeline by adopting double air inlets, so that the air inlet pipelines can be effectively prevented from being blocked, and the normal operation of the equipment can not be influenced by online cleaning when one pipeline is blocked.
Further, at least one of the first circulation water tank 21 and the second circulation water tank 41 is provided with an overflow liquid level detector 211 and a supply liquid level monitor 471, and the overflow liquid level detector 211 and the supply liquid level monitor 471 are finished products in the prior art. The overflow level detector 211 is constructed as a float for monitoring the maximum level of the liquid level, and discharges the liquid through the opened electric valve for drainage when the liquid level is too high. The supply level monitor 471 is used for monitoring the level position, setting warning levels with different heights for detecting the level height, and adding water B and medicament a by opening the electromagnetic valves on the dosing pipeline 47 and the water supplementing pipeline 46 when the level is too low.
EXAMPLE III
As shown in fig. 1 to 5, in the first or second embodiment, a control box 7 is further provided on the processing apparatus body 20, and the control box 7 can be directly connected to a product of the prior art and electrically connected to an electromagnetic valve in a pipeline in the apparatus and a circulating water pump 22 through the control box 7 to perform electrical control. Through the auxiliary action of the liquid level monitors arranged in the first circulation water tank 21 of the absorption system 2 and the second circulation water tank 41 of the absorption system 4, the corresponding liquid levels of the first circulation water tank 21 and the second circulation water tank 41 are monitored, liquid level parameters are provided for the control box 7, normal spraying and purifying operations are convenient to perform, and water and medicament adding operations are automatically performed when the liquid level is low.
Further, at least one of the first circulation water tank 21 and the second circulation water tank 41 is connected to the chemical adding line 47 and the water replenishing line 46, and the drain line 48. An overflow liquid level detector 211 corresponding to the drainage pipeline is arranged in at least one of the first circulating water tank 21 and the second circulating water tank 41; the overflow liquid level detector 211 is a float of the prior art, and may be an overflow liquid level detector of FCCGW5P340770A, but is not limited thereto, and in other embodiments, other types of products of the prior art may also be used, and the overflow liquid level detector 211 is configured to detect the height of the collected liquid levels in the first circulation water tank 21 and the second circulation water tank 41. At least one of the first circulating water tank 21 and the second circulating water tank 41 is provided with a liquid feeding level alarm corresponding to the circulating water feeding mechanism, the liquid feeding level alarm is used for performing graded detection on a plurality of liquid levels and is used for detecting the height position of the liquid level, whether water B and a medicament A need to be added through the medicament adding pipeline 47 and the water supplementing pipeline 46 or not is adopted as the medicament A, the medicament A is a waste gas purification medicament in the prior art, and the selection of the medicament is not repeated in detail.
Furthermore, a pH controller is arranged in at least one of the first circulating water tank 21 and the second circulating water tank 41, the pH value state of the liquid in the first circulating water tank 21 and the second circulating water tank 41 is detected through the pH controller, and the medicament A is added according to the state. The pH controller may be a pH control detector of CPM223-MR8005 model E + H, but is not limited thereto, and in other embodiments, other prior art models may be used.
The working principle is as follows:
the use of a small-air-volume exhaust gas treatment device, for example; the air flow direction C is as shown in fig. 5, the waste gas or tail gas from the machine table firstly enters the absorption system 2 from the bottom to the top through the air inlet pipe from the first air inlet branch pipe 11 or the second air inlet branch pipe 12 to be in countercurrent contact with a large amount of circulating liquid reversely sprayed by the first spraying mechanism 24, dust in the waste gas is captured, and simultaneously the waste gas is neutralized with acidic or alkaline pollutants in the waste gas to carry out chemical absorption, the waste gas absorbed by the absorption system 2 enters the absorption system two 4 from the top to the bottom through the first air outlet of the absorption system 2 and is fully contacted with the circulating liquid with chemical agents sprayed by the second spraying mechanism 43 in the packing layer 42 to carry out chemical absorption again. The absorption system 2 is empty tower absorption to prevent the packing from being blocked by particles in the waste gas; the second absorption system 4 is a packed tower for absorption, the gas treated by the second absorption system 2 enters the second absorption system 4, and a packing layer 42 is arranged inside the second absorption system 4 to provide sufficient contact area for gas-liquid contact and increase contact time, so that efficient absorption is ensured.
A small air quantity waste gas treatment device aims at local treatment of small air quantity, small dust content, high-concentration acid and alkali waste gas generated by a machine table or other processes, the treated clean gas is connected into a central washing tower, and is led to an exhaust funnel together for high-altitude discharge through an induced draft fan of the central washing tower. And an induced draft fan does not need to be separately configured. The small-air-volume waste gas treatment device has the advantages of compact structure, simple equipment configuration, high-efficiency and stable absorption and purification effects on the small-air-volume waste gas, and high space utilization rate. The installation, the operation and the maintenance are simple, the skid-mounted type can be made, and the position is flexible. The method has low investment cost and reliable operation, and is suitable for treating the waste gas generated by the machine in the industries of electronics, semiconductors, liquid crystals, solar energy and the like.
In light of the foregoing, it is to be understood that various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (9)
1. A small-air-volume waste gas treatment device comprises a treatment device body, wherein an absorption system I and an absorption system II which are connected through an induced air channel are also arranged in the treatment device body, a plurality of air inlets are formed in the absorption system I, and an air outlet is formed in the absorption system II; the method is characterized in that: the absorption system I and the absorption system II are respectively provided with a spraying mechanism, the absorption system II is internally provided with a packing layer below the spraying mechanism, an air outlet of the induced air channel is positioned on the upper part of the packing layer, a converging exhaust part below the packing layer is arranged on the air outlet, the converging exhaust part comprises a converging cover arranged below the packing layer, and the upper part of the converging cover is provided with a guide pipe leading to the outside of the treatment device body.
2. A small-air-volume exhaust gas treatment device according to claim 1, characterized in that: the air inlet pipeline is also connected with a branch spray pipe; the air inlet pipeline comprises a first air inlet branch pipe and a second air inlet branch pipe which are connected with the air inlet, the first air inlet branch pipe and the second air inlet branch pipe are respectively connected with the branch spray pipes, and the branch spray pipes are connected with the circulating water feeding mechanism.
3. A small-air-volume exhaust gas treatment device according to claim 2, characterized in that: the collecting cover is of a round structure with an inlet facing downwards and an outlet facing upwards, one end of the flow guide pipe is connected with the outlet, and the other end of the flow guide pipe penetrates through the gas outlet and then is led out to the outside of the treatment device body.
4. A small-air-volume exhaust gas treatment device according to claim 1 or 2, characterized in that: the absorption system and the absorption system adopt an empty tower absorption type and a filler absorption type respectively, the lower part in the absorption system is a first circulating water tank, and a spraying mechanism of the absorption system is positioned above the air inlet; the lower part in the second absorption system is a second circulating water tank, and the confluence exhaust part is positioned at the upper part of the second circulating water tank; the treatment device body is also connected with a dosing pipeline, a water replenishing pipeline and a water draining pipeline.
5. A small-air-volume exhaust gas treatment device according to claim 3, characterized in that: the absorption system is formed by dividing the absorption system and the absorption system into an absorption cavity in the inner cavity of the processing device body through a partition plate; the air inducing channel penetrates through the upper part of the partition plate, and a through hole is formed in the lower part of the partition plate; the first circulating water tank and the second circulating water tank are communicated through the through holes in the partition plate, and the first circulating water tank and the second circulating water tank are connected with the spraying mechanism through a circulating pipeline of the circulating water feeding mechanism and a circulating water pump.
6. A small-air-volume exhaust gas treatment device according to claim 1, characterized in that: the spraying mechanism of the absorption system comprises a plurality of spraying heads arranged in the absorption system, and the spraying direction of the spraying heads faces upwards.
7. A small-air-volume exhaust gas treatment device according to claim 1, characterized in that: and the spraying mechanism of the second absorption system comprises a plurality of spraying heads arranged in the second absorption system, and the spraying direction of the spraying heads is downward and is opposite to the packing layer.
8. The small-air-volume exhaust gas treatment device according to claim 5, characterized in that: the circulating water feeding mechanism also comprises a Y-shaped filter connected with the circulating water pump.
9. The small-air-volume exhaust gas treatment device according to claim 5, characterized in that: the filler layer adopts one or more of filler with longitudinal pores, taylor rosette and pall ring filler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221043729.3U CN217855426U (en) | 2022-05-05 | 2022-05-05 | Waste gas treatment device with small air volume |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221043729.3U CN217855426U (en) | 2022-05-05 | 2022-05-05 | Waste gas treatment device with small air volume |
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| Publication Number | Publication Date |
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| CN217855426U true CN217855426U (en) | 2022-11-22 |
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| CN202221043729.3U Active CN217855426U (en) | 2022-05-05 | 2022-05-05 | Waste gas treatment device with small air volume |
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| CN (1) | CN217855426U (en) |
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2022
- 2022-05-05 CN CN202221043729.3U patent/CN217855426U/en active Active
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