CN215782338U - Foam dust removal device - Google Patents
Foam dust removal device Download PDFInfo
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- CN215782338U CN215782338U CN202121025267.8U CN202121025267U CN215782338U CN 215782338 U CN215782338 U CN 215782338U CN 202121025267 U CN202121025267 U CN 202121025267U CN 215782338 U CN215782338 U CN 215782338U
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Abstract
The utility model discloses a foam dust removal device, which comprises a dust removal container and a dust removal unit, wherein the dust removal container is provided with an air inlet and an air outlet, the dust removal unit is arranged in the dust removal container and is positioned between the air inlet and the air outlet, the foam dust removal device comprises a sieve plate and a foam washing nozzle, the foam washing nozzle is arranged above the sieve plate and is used for conveying washing water to the sieve plate, the sieve plate is arranged above the air inlet and comprises a foaming layer and sieve pores, the sieve pores are arranged at the bottom of the foaming layer, the washing water flows out of the sieve pores to primarily filter dust-containing air entering the dust removal container from the air inlet, and the foaming layer is used for physically foaming the washing water and the primarily filtered dust-containing air and secondarily filtering the dust-containing air. The foam dust removal device has the advantages that all parts are designed separately, all parts are easy to disassemble, the installation and the maintenance are convenient, and the structure is simple.
Description
Technical Field
The utility model particularly relates to a foam dust removal device.
Background
In a post-treatment plant area of a windy and sandy area, outdoor air needs to be subjected to centralized dust removal and then is sent to each plant for use so as to meet the requirement of each device in the plant on air inlet cleanliness. The dust content of the air supply and the air temperature and humidity are parameters which mainly affect the process equipment of a factory building needing air supply and the working environment of workers in the factory building.
In current aftertreatment air inlet center design, foam dust collector generally takes concrete to build pond and foam scrubbing room and removes dust to the air, and this foam dust collector is whole to be built by the concrete, and foam scrubbing room and concrete build pond integration, lead to foam dust collecting equipment's manufacturing and use investment big, and the equipment maintenance is changed inconveniently, and silt clearance is difficult, and the cooling effect is poor, simultaneously, hardly carries out design optimization and technical innovation on former basis.
In addition, in the prior art, more harmful substances and dust in the chemical industry deaerating of using the foam washing, remove dust to the air that contains dust with the sieve foam blanket, and can't carry out evaporative cooling, be difficult to satisfy the requirement of equipment to air temperature humidity in the factory building.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is to provide a foam dust removal device aiming at the defects in the prior art, wherein each component of the foam dust removal device is separately designed, each component is easy to disassemble, the installation and the maintenance are convenient, and the structure is simple.
In order to solve the technical problems, the utility model adopts the following technical scheme:
a foam dust removing device comprises a dust removing container and a dust removing unit,
the dust removing container is provided with an air inlet and an air outlet,
the dust removal unit is arranged in the dust removal container and between the air inlet and the air outlet, and comprises a sieve plate and a foam washing nozzle,
the foam washing nozzle is arranged above the sieve plate and used for conveying washing water to the sieve plate,
the sieve sets up air intlet's top, the sieve includes foaming layer and sieve mesh, the sieve mesh is located foaming layer's bottom, the washing water flows out in order to follow from air intlet gets into dust removal container's dusty air and carries out the prefiltration, the foaming layer be used for with washing water and the dusty air through the prefiltration carry out physical foaming, and right dusty air carries out secondary filter.
Preferably, the foam dust removal device further comprises an evaporative cooling unit, wherein the evaporative cooling unit comprises a filler layer and an evaporative cooling nozzle;
the evaporative cooling nozzle is arranged above the filler layer and used for providing cooling water for the filler layer;
the filler layer is arranged above the foam washing nozzle and is used for evaporating, cooling and filtering the dust-containing air after secondary filtration.
Preferably, the foam dedusting device further comprises a water retaining unit, the water retaining unit comprises a water retaining plate,
the water baffle is arranged above the evaporative cooling nozzle and used for removing water from the clean air output from the filler layer.
Preferably, the air inlet is arranged on the side wall of the dust removing container, the sewage generated by the dust removing unit is collected at the bottom of the dust removing container,
the device also comprises a circulating water conveying unit which comprises a first circulating conveying assembly, wherein the first circulating conveying assembly comprises a first filter, a washing water storage tank, a first pipeline and a washing water pump,
the first filter is used for filtering the sewage at the bottom of the dust removing container,
the washing water storage tank is communicated with the bottom of the dust removal container through the first filter and is used for storing washing water formed after the sewage is filtered;
both ends of the first pipeline are respectively connected with the washing water storage tank and the foam washing nozzle,
the washing water pump is arranged on the first pipeline and used for pumping the washing water in the washing water storage tank to the foam washing nozzle.
Preferably, the circulating water unit further comprises a second conveying assembly, the second conveying assembly comprises a third filter, a cooling water storage tank, a second pipeline and an evaporative cooling pump,
the cooling water storage tank is used for storing the cooling water;
both ends of the second pipeline are respectively connected with the cooling water storage tank and the evaporative cooling nozzle,
the evaporative cooling pump is arranged on the second pipeline and used for pumping the cooling water in the cooling water storage tank to the evaporative cooling nozzle;
the third filter is disposed on the second pipe for filtering the cooling water entering the evaporative cooling pump.
Preferably, the first delivery assembly further comprises a first valve disposed on the first pipe for adjusting a flow rate of the washing water;
the second delivery assembly further comprises a second valve disposed on the second conduit for regulating the flow of the cooling water.
Preferably, the apparatus further comprises a control unit comprising a first flow meter, a second flow meter and a controller,
the first flow meter is arranged on the first pipeline and used for monitoring the flow of the washing water;
the second flowmeter is arranged on the second pipeline and used for monitoring the flow of the cooling water;
the controller is respectively electrically connected with the first valve and the first flow meter, a preset washing water flow value and a first mapping table of washing water flow and first valve opening degree are stored in the controller, and the controller is used for comparing the first flow value monitored by the first flow meter with the preset washing water flow value and regulating the opening degree of the first valve according to the first flow value and the first mapping table;
the controller is also used for comparing the second flow value monitored by the second flow meter with the preset cooling water flow value and adjusting the opening of the second valve according to the second mapping table.
Preferably, the foam dust removing device also comprises a flow stabilizer,
the current stabilizer is arranged above the sieve plate, dust-containing air which is output from the sieve plate and subjected to secondary filtration enters the current stabilizer, and the current stabilizer is used for enabling the output air to be uniformly distributed.
Preferably, the dust removal container is further provided with an observation window, and the observation window is arranged on the side wall of the dust removal container.
Preferably, the dust removal container is made of stainless steel.
The foam dust removal device provided by the utility model has the advantages that the sieve plate and the foam washing nozzle are separately arranged, the disassembly and the maintenance are convenient, the installation is convenient, the structure is simple, and the reduction of the installation and maintenance cost is facilitated. In addition, the foam dust removal device is also provided with an evaporative cooling unit, so that air can be subjected to evaporative cooling, and the requirement of equipment in a factory building on the air temperature is met. The dust removal container is made of stainless steel, so that the investment for manufacturing the foam dust removal device is low.
Drawings
FIG. 1 is a schematic structural diagram of a foam dedusting apparatus in an embodiment of the present invention.
In the figure: 1-an air inlet; 2-sieve plate; 3-a current stabilizer; 4-foam washing nozzle; 5-a filler layer; 6-evaporative cooling nozzles; 7-a water baffle; 8-an air outlet; 9-a sewage valve; 10-a first filter; 11-a second filter; 12-a third filter; 13-washing water pump; 14-an evaporative cooling pump; 15-first electrically operated valve; 16-a second electrically operated valve; 17-first flow meter.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments, but not all embodiments, of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of the present invention.
In the description of the present invention, it should be noted that the indication of orientation or positional relationship, such as "on" or the like, is based on the orientation or positional relationship shown in the drawings, and is only for convenience and simplicity of description, and does not indicate or imply that the device or element referred to must be provided with a specific orientation, constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected," "disposed," "mounted," "fixed," and the like are to be construed broadly, e.g., as being fixedly or removably connected, or integrally connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases for those skilled in the art.
The utility model provides a foam dust removing device, which comprises a dust removing container and a dust removing unit,
the dust removing container is provided with an air inlet and an air outlet,
the dust removal unit is arranged in the dust removal container and between the air inlet and the air outlet, and comprises a sieve plate and a foam washing nozzle,
the foam washing nozzle is arranged above the sieve plate and used for conveying washing water to the sieve plate,
the sieve sets up air intlet's top, the sieve includes foaming layer and sieve mesh, the sieve mesh is located foaming layer's bottom, the washing water flows out in order to follow from air intlet gets into dust removal container's dusty air and carries out the prefiltration, the foaming layer be used for with washing water and the dusty air through the prefiltration carry out physical foaming, and right dusty air carries out secondary filter.
Example 1:
the embodiment discloses a foam dust removal device, which comprises a dust removal container and a dust removal unit, wherein the dust removal container is provided with an air inlet 1 and an air outlet 8, the air inlet 1 is arranged at the lower part of the dust removal container, and the air outlet 8 is arranged at the upper part of the dust removal container, as shown in fig. 1. The dust removing unit is arranged in the dust removing container and between the air inlet 1 and the air outlet 8, and comprises a sieve plate 2 and a foam washing nozzle 4. Foam washing nozzle 4 sets up the top at sieve 2 for carry the washing water on to sieve 2, sieve 2 sets up in air intlet 1's top, sieve 2 includes foaming layer and sieve mesh, the bottom on foaming layer is located to the sieve mesh, the washing water flows down in the sieve mesh in order to carry out prefiltration to the dirty air that gets into dust removal container from air intlet 1, the foaming layer is used for carrying out the physics foaming to washing water and the dirty air through prefiltration, and carry out secondary filter to dirty air.
In this embodiment, the foam washing nozzle 4 is a spiral nozzle, which enables the washing water to be more uniformly delivered to the sieve plate 2. In this embodiment, the aperture ratio, the aperture diameter, and the thickness of the sieve pores of the sieve plate 2 are determined according to the actual working conditions. The number of the foam washing nozzles 4 may be set to be plural, and the diameter, the number and the distribution interval of the foam washing nozzles 4 are also determined according to the actual working condition.
In this embodiment, the sieve plate 2 washes the dust-containing air in two stages: the first stage is carried out in the space below the sieve plate 2, after the air containing dust enters the space below the sieve plate 2 from the air inlet 1, the air contacts with the washing water leaked from the sieve holes, and the dust is collected by the washing water drops and then falls to the bottom of the dust removal container. The rest part of the air containing dust impacts the lower surface of the sieve plate 2, and the dust continues to settle under the action of inertia force due to the contraction of airflow at the inlet of the sieve hole 2; the second stage is carried out on a foaming layer in the sieve plate 2, severe disturbance can be generated due to reverse collision of dust-containing air and washing water in the foaming layer of the sieve plate 2, in the disturbance process, air and water perform physical action on the sieve plate to generate foam, and dust is further cleaned after passing through the foaming layer in the severe disturbance process of the dust-containing air passing through the sieve holes. In this embodiment, the two stages are both used for removing dust with a particle size larger than 5 μm from the dust-containing air. Foam dust collector in this embodiment separately sets up sieve 2 and foam washing nozzle 4, and each part all can be dismantled and change, convenient to detach maintenance, and simple to operate, and simple structure is favorable to reducing installation and cost of maintenance.
In this embodiment, foam dust collector still includes the evaporation cooling unit, and the evaporation cooling unit includes packing layer 5 and evaporation cooling nozzle 6, and evaporation cooling nozzle 6 sets up in packing layer 5 top for provide the cooling water for packing layer 5. In this embodiment, the evaporative cooling nozzle 6 is a spiral nozzle, which enables the cooling water to be more uniformly delivered to the packing layer 5. The filler layer 5 is arranged above the foam washing nozzle 4 and is used for evaporative cooling and filtering the dust-containing air after secondary filtration. The evaporative cooling unit in this embodiment can carry out the evaporative cooling operation to the air after the filtration, can adjust the humiture of air, satisfies the requirement of equipment to the humiture of gas in the factory building.
In this embodiment, foam dust collector still includes the manger plate unit, and the manger plate unit includes manger plate 7, and manger plate 7 sets up in evaporative cooling nozzle 6 top for carry out the dewatering to the clean air of output in following packing layer 5, in this embodiment, the manger plate efficiency of manger plate 7 can reach more than 90%, prevents that the air after the washing from carrying steam.
In this embodiment, the air inlet 1 is disposed on the sidewall of the dust removing container, and the sewage generated by the dust removing unit is collected at the bottom of the dust removing container. Preferably, the foam dedusting device further comprises a sewage valve 9, wherein the sewage valve 9 is arranged below the air inlet 1 and is positioned at the bottom of the side wall of the dedusting container, and is used for discharging sewage at the bottom of the dedusting container, so that dust-containing slurry at the bottom of the dedusting container can be discharged regularly, and sludge in the dedusting container can be cleaned.
Preferably, the foam dust removal device further comprises a current stabilizer 3, the current stabilizer 3 is arranged above the sieve plate 2, dust-containing air which is output from the sieve plate 2 and subjected to secondary filtration enters the current stabilizer 3, and the current stabilizer 3 is used for enabling the output air to be uniformly distributed.
Specifically, after entering the dust removal container from the air inlet 1, the dust-containing air flows from bottom to top towards the top of the dust removal container, and first contacts with washing water leaked from the sieve pores of the sieve plate 2 to complete the first step of washing to remove particles with a particle size larger than 5 μm, and then the dust-containing air reaches the lower part of the sieve plate 2 and enters into the foaming layer through the sieve plate 2, wherein the foaming layer is formed in the sieve plate 2 and on the upper surface of the sieve plate 2, when the gas passes through the sieve pores of the sieve plate 2, the dust-containing air collides with the washing water sprayed onto the sieve plate 2 by the foam washing nozzle 4 to generate foam by impact to form the foaming layer, the dust-containing air contacts with the foaming layer in the sieve plate, and the dust-containing particles with a particle size larger than 5 μm are secondarily filtered, so that the filtering operation is completed. Then the dirty air after the secondary filtration passes through current stabilizer 3, makes the dirty air after the secondary filtration distribute more evenly in dust removal container inside, and the dirty air after the secondary filtration can carry out evaporative cooling after contacting with packing layer 5 that receives the cooling water that evaporative cooling nozzle 6 sprayed, and simultaneously, the dirty air after the secondary filtration can also carry out the filtration dust removal for the third time in packing layer 5, obtains the clean gas after the cooling. The filler plate 5 can be one of organic filler, inorganic filler, natural plant fiber filler, metal filler, non-woven fabric filler, PVC filler and porous ceramic material. Clean air comes out from packing layer 5 back, and with the cooling water mist contact of evaporative cooling nozzle 6 spun, further realize the effect of cooling and humidification, the air that carries steam at last is discharged from air outlet 8 after the breakwater 7 dewatering. The collected dust forms a dust-containing slurry at the bottom of the dust removal container, and the dust-containing slurry is periodically discharged by opening the waste valve 9.
The foam dust removal device in the embodiment further comprises a circulating water conveying unit, the circulating water conveying unit comprises a first circulating conveying assembly, the first circulating conveying assembly comprises a first filter 10, a washing water storage tank, a first pipeline and a washing water pump 13, the first filter 10 is used for filtering sewage at the bottom of the dust removal container, the washing water storage tank is arranged outside the dust removal container and communicated with the bottom of the dust removal container through the first filter 10 and used for storing washing water formed after the sewage is filtered. Both ends of the first pipeline are respectively connected with the washing water storage tank and the foam washing nozzle 4. The washing water pump 13 is arranged on the first pipeline and used for pumping the washing water in the washing water storage tank to the foam washing nozzle 4 to realize the recycling after sewage treatment, and as partial water quantity can be taken away in the discharging process of the dust-containing slurry, the washing water in the washing water storage tank is possibly insufficient, and the washing water is supplemented by external clean water.
Optionally, the circulating water conveying unit further comprises a second filter 11, the second filter 11 being arranged on the first pipe for further filtering the washing water entering into the foam washing nozzle 4.
In this embodiment, the circulating water unit further includes a second conveying assembly, and the second conveying assembly includes a third filter 12, a cooling water storage tank, a second pipeline, and an evaporative cooling pump 14, and the cooling water storage tank is used for storing cooling water. The two ends of the second pipeline are respectively connected with the cooling water storage tank and the evaporative cooling nozzle 6, and the evaporative cooling pump 14 is arranged on the second pipeline and used for pumping the cooling water in the cooling water storage tank to the evaporative cooling nozzle 6. A third filter 12 is provided on the second conduit for filtering the cooling water entering the evaporative cooling pump 14. In this embodiment, for avoiding the circulating water turbidity to block up evaporative cooling nozzle 6, the cooling water adopts clean water all the time.
In this embodiment, the first delivery assembly further includes a first valve disposed on the first pipe for adjusting a flow rate of the washing water. The second delivery assembly further comprises a second valve disposed on the second conduit for regulating the flow of cooling water.
In this embodiment, the foam dust removing device further includes a control unit, and the control unit includes a first flow meter 17, a second flow meter, and a controller, and the first flow meter is disposed on the first pipe and is used for monitoring the flow rate of the washing water. The second flowmeter is arranged on the second pipeline and used for monitoring the flow of the cooling water. The controller is respectively electrically connected with the first valve and the first flow meter, a preset washing water flow value and a first mapping table of washing water flow and first valve opening degree are stored in the controller, and the controller is used for comparing the first flow value monitored by the first flow meter with the preset washing water flow value and adjusting the opening degree of the first valve according to the first flow value and the first mapping table.
The controller is also used for comparing the second flow value monitored by the second flow meter with the preset cooling water flow value and adjusting the opening of the second valve according to the second mapping table.
In this embodiment, the dust removal container is further provided with an observation window, and the observation window is arranged on the side wall of the dust removal container and used for observing the operation state of the dust removal unit inside the dust removal container.
In this embodiment, dust removal container adopts stainless steel material to make, and this material is light, and easily makes, has avoided the big equipment maintenance of investment inconvenient problem of changing that prior art adopted concrete to make to bring.
The foam dust collector of this embodiment separately sets up sieve and foam washing nozzle, convenient to detach maintenance, and simple to operate, and simple structure is favorable to reducing installation and cost of maintenance. In addition, the foam dust collector of this embodiment still is provided with the evaporative cooling unit, can carry out evaporative cooling to the air, satisfies the requirement of equipment to air temperature humidity in the factory building. The dust removal container of this embodiment adopts stainless steel for the investment of foam dust collector's manufacturing is little.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the utility model, and these modifications and improvements are also considered to be within the scope of the utility model.
Claims (10)
1. A foam dust removal device is characterized by comprising a dust removal container and a dust removal unit,
the dust removing container is provided with an air inlet (1) and an air outlet (8),
the dust removal unit is arranged in the dust removal container and between the air inlet and the air outlet, and comprises a sieve plate (2) and a foam washing nozzle (4),
the foam washing nozzle is arranged above the sieve plate and used for conveying washing water to the sieve plate,
the sieve sets up air intlet's top, the sieve includes foaming layer and sieve mesh, the sieve mesh is located foaming layer's bottom, the washing water flows out in order to follow from air intlet gets into dust removal container's dusty air and carries out the prefiltration, the foaming layer be used for with washing water and the dusty air through the prefiltration carry out physical foaming, and right dusty air carries out secondary filter.
2. A foam dust extraction device according to claim 1, characterized in that it further comprises an evaporative cooling unit comprising a filler layer (5) and an evaporative cooling nozzle (6);
the evaporative cooling nozzle is arranged above the filler layer and used for providing cooling water for the filler layer;
the filler layer is arranged above the foam washing nozzle and is used for evaporating, cooling and filtering the dust-containing air after secondary filtration.
3. A foam dust extraction device according to claim 2, characterized in that it further comprises a water deflector unit comprising a water deflector (7),
the water baffle is arranged above the evaporative cooling nozzle and used for removing water from the clean air output from the filler layer.
4. The foam dust removing device according to claim 3, wherein the air inlet is provided on a side wall of the dust removing container, the sewage generated by the dust removing unit is collected at the bottom of the dust removing container,
the device also comprises a circulating water conveying unit which comprises a first circulating conveying assembly, wherein the first circulating conveying assembly comprises a first filter, a washing water storage tank, a first pipeline and a washing water pump (13),
the first filter is used for filtering the sewage at the bottom of the dust removing container,
the washing water storage tank is communicated with the bottom of the dust removal container through the first filter and is used for storing washing water formed after the sewage is filtered;
both ends of the first pipeline are respectively connected with the washing water storage tank and the foam washing nozzle,
the washing water pump is arranged on the first pipeline and used for pumping the washing water in the washing water storage tank to the foam washing nozzle.
5. The foam dedusting apparatus according to claim 4, characterized in that the circulating water unit further comprises a second conveying assembly, the second conveying assembly comprises a third filter, a cooling water storage tank, a second pipeline and an evaporative cooling pump (14),
the cooling water storage tank is used for storing the cooling water;
both ends of the second pipeline are respectively connected with the cooling water storage tank and the evaporative cooling nozzle,
the evaporative cooling pump is arranged on the second pipeline and used for pumping the cooling water in the cooling water storage tank to the evaporative cooling nozzle;
the third filter is disposed on the second pipe for filtering the cooling water entering the evaporative cooling pump.
6. The foam dedusting apparatus as recited in claim 5, wherein the first conveying assembly further comprises a first valve disposed on the first pipe for adjusting a flow rate of the washing water;
the second delivery assembly further comprises a second valve disposed on the second conduit for regulating the flow of the cooling water.
7. A foam dust extraction unit according to claim 6, characterized in that the unit further comprises a control unit comprising a first flow meter (17), a second flow meter and a controller,
the first flow meter is arranged on the first pipeline and used for monitoring the flow of the washing water;
the second flowmeter is arranged on the second pipeline and used for monitoring the flow of the cooling water;
the controller is respectively electrically connected with the first valve and the first flow meter, a preset washing water flow value and a first mapping table of washing water flow and first valve opening degree are stored in the controller, and the controller is used for comparing the first flow value monitored by the first flow meter with the preset washing water flow value and regulating the opening degree of the first valve according to the first flow value and the first mapping table;
the controller is also used for comparing the second flow value monitored by the second flow meter with the preset cooling water flow value and adjusting the opening of the second valve according to the second mapping table.
8. The foam dust removal device of any one of claims 1 to 7, further comprising a flow stabilizer,
the current stabilizer is arranged above the sieve plate, dust-containing air which is output from the sieve plate and subjected to secondary filtration enters the current stabilizer, and the current stabilizer is used for enabling the output air to be uniformly distributed.
9. The foam dust collector as claimed in any one of claims 1-7, wherein the dust collecting container is further provided with an observation window, and the observation window is arranged on the side wall of the dust collecting container.
10. A foam dust collector as claimed in any one of claims 1 to 7, wherein said dust collector is made of stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121025267.8U CN215782338U (en) | 2021-05-13 | 2021-05-13 | Foam dust removal device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121025267.8U CN215782338U (en) | 2021-05-13 | 2021-05-13 | Foam dust removal device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215782338U true CN215782338U (en) | 2022-02-11 |
Family
ID=80172838
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121025267.8U Active CN215782338U (en) | 2021-05-13 | 2021-05-13 | Foam dust removal device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215782338U (en) |
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2021
- 2021-05-13 CN CN202121025267.8U patent/CN215782338U/en active Active
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