CN219674266U - Anti-ash blocking structure of air preheater - Google Patents
Anti-ash blocking structure of air preheater Download PDFInfo
- Publication number
- CN219674266U CN219674266U CN202321142684.XU CN202321142684U CN219674266U CN 219674266 U CN219674266 U CN 219674266U CN 202321142684 U CN202321142684 U CN 202321142684U CN 219674266 U CN219674266 U CN 219674266U
- Authority
- CN
- China
- Prior art keywords
- dust
- dust treatment
- air preheater
- treatment box
- fixedly connected
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 230000000903 blocking effect Effects 0.000 title claims abstract description 16
- 239000000428 dust Substances 0.000 claims abstract description 141
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000000926 separation method Methods 0.000 claims abstract description 16
- 230000002265 prevention Effects 0.000 claims abstract description 11
- 239000007921 spray Substances 0.000 claims description 31
- 238000007789 sealing Methods 0.000 claims description 13
- 230000005611 electricity Effects 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 28
- 239000003546 flue gas Substances 0.000 abstract description 28
- 239000003595 mist Substances 0.000 abstract description 11
- 238000005507 spraying Methods 0.000 abstract description 11
- 238000000034 method Methods 0.000 abstract description 6
- 230000000630 rising effect Effects 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 13
- 239000000779 smoke Substances 0.000 description 10
- 238000009434 installation Methods 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002277 temperature effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Chimneys And Flues (AREA)
Abstract
The utility model discloses an ash blocking prevention structure of an air preheater, which relates to the technical field of auxiliary devices of air preheaters and comprises a dust treatment box, a dust separation unit and a dust treatment unit; the middle positions of the upper end and the lower end of the dust treatment box are fixedly connected with a connecting flange; the dust separation unit comprises an inner pipeline, a mounting column, a mounting ring, a connecting rod, a motor, a fan impeller and a dust through hole, wherein a vertical inner pipeline is embedded and arranged in the middle position inside the dust treatment box, and four vertical mounting columns are fixedly connected to the inner wall of the inner pipeline in a circumferential array manner; the dust treatment units are arranged on the front side and the rear side of the dust treatment box. The utility model can separate dust in the rising process of the flue gas, and has a reliable dust treatment unit, and the separated dust can be condensed into mud drops by spraying water mist, so that the dust can be effectively treated to prevent the air preheater from being blocked.
Description
Technical Field
The utility model relates to the technical field of auxiliary devices of air pre-heaters, in particular to an ash blocking preventing structure of an air pre-heater.
Background
The air preheater is a preheating device for improving the heat exchange performance of a steam boiler and reducing the heat loss. In a coal-fired power generation plant, the flue gas generated by the combustion of a boiler has huge heat, and the air preheater can conduct the heat in the flue gas to the air before entering the boiler through the sheets and preheat the air to a certain temperature, so that the heat energy is recycled; in actual production, the flue gas generated by boiler combustion also carries a large amount of dust, and the dust gathers for a long time to block the air preheater;
the ash blocking prevention structure of the air preheater disclosed by the authority bulletin No. CN216281486U in the prior art comprises a first return air preheater, a second return air preheater and a third return air preheater, wherein a secondary air inlet at the bottommost part of the air preheater starts to be the first return air preheater, the middle part of the air preheater is the second return air preheater, an air preheater outlet below an upper economizer is the third return air preheater, and the third return air preheater, the second return air preheater and the first return air preheater are sequentially arranged from top to bottom according to the process from a high temperature section to a low temperature section, so that wind resistance can be effectively reduced, the residence time of wind in a pipe is increased, the heat absorption capacity is increased, and the working efficiency is ensured;
the device mainly relates to a design in the aspect of increasing the heat absorption capacity of the air preheater, but can realize the ash blocking prevention function of the air preheater, and along with long-time use, dust carried in smoke can block the air preheater, so that the air preheater can not circulate after a delay, and even production and installation accidents can be caused.
Disclosure of Invention
The utility model aims to overcome the existing defects, and provides an ash blocking prevention structure of an air preheater, which is provided with a reliable dust separation unit, a reliable dust treatment unit and a water mist spraying unit, wherein dust can be separated in the rising process of smoke, and the separated dust can be condensed into mud drops by spraying water mist, so that the dust can be effectively treated to prevent the air preheater from being blocked, and the problems in the background art can be effectively solved.
In order to achieve the above purpose, the present utility model provides the following technical solutions: an ash blocking prevention structure of an air preheater comprises a dust treatment box, a dust separation unit and a dust treatment unit;
dust treatment box: a connecting flange is fixedly connected to the middle positions of the upper end and the lower end;
a dust separation unit: the dust treatment box comprises an inner pipeline, mounting columns, mounting rings, connecting rods, motors, fan blades and dust through holes, wherein a vertical inner pipeline is embedded in the middle position of the inner part of the dust treatment box, four vertical mounting columns are fixedly connected to the inner wall of the inner pipeline in a circumferential array manner, clamping slots are formed in the front, the rear, the left and the right directions of the mounting rings, the mounting rings are mounted at the lower end of the inner part of the inner pipeline and are clamped with the mounting columns through the clamping slots, a motor is mounted at the central position of the mounting rings, the motor is fixedly connected with the inner wall of the mounting rings through four connecting rods arranged in an array manner on the outer side of the circumference, the output shaft of the motor is downwards arranged, the fan blades are fixedly mounted at the end parts of the motor, and a plurality of vertical dust through holes are formed in the circumferential array on the upper side of the inner wall of the inner pipeline;
dust treatment unit: are arranged on the front side and the rear side of the dust treatment box.
The dust treatment box is used for providing the place of handling dust in the flue gas, flange is used for dust treatment box to be connected with outside flue gas pipeline, inside pipeline is used for the passing through of flue gas, the erection column is used for the installation of collar, the collar is installed and is fixed the motor through the connecting rod, the motor is through driving the impeller rotation, and then make the flue gas spiral shell screwing up that passes through, the heavier dust of quality can receive than the bigger centrifugal force of fog in the flue gas, thereby make the dust can separate with fog, the dust after the separation can enter into the clamp cavity through the dust through-hole, thereby the dust treatment unit is arranged in spraying water fog and condenses the dust into mud drop, and then can effectively handle the dust, in order to prevent to block up the air preheater.
Further, the dust separation unit still contains connecting block and fixing bolt, the upper end of collar and all install the connecting block of an L shape with four erection columns adjacent position departments, the both ends of L shape connecting block pass through fixing bolt respectively with collar and erection column fixed connection. The connecting block realizes the fixed connection between the installation ring and the installation column through the fixing bolt.
Further, the dust treatment unit comprises a clamping chamber, an electric spray head and a water pipe connector, a gap is reserved between the inner pipeline and the outer side of the dust treatment box, so that an annular clamping chamber is formed, the electric spray head is embedded and arranged at four corners of the upper end of the dust treatment box, the spray end of the electric spray head extends downwards into the clamping chamber, and one end of the electric spray head, which is upwards exposed, is fixedly connected with the water pipe connector. The clamping chamber is used for processing separated dust, the water pipe connector is used for introducing a water source into the electric spray head, the electric spray head condenses the dust in a scattering state by spraying water mist, the water drops adhere to the dust and fall into the bottom of the clamping chamber, and the moisture at the bottom of the clamping chamber can be evaporated due to the high temperature effect of smoke, so that dry mud blocks are left at the bottom.
Further, the dust treatment unit further comprises a movable shaft, a movable door and a clamping lock, wherein the movable door is arranged at the front end and the rear end of the dust treatment box and is movably connected with the dust treatment box through the movable shaft at the lower side, and the clamping lock is arranged at the upper side of the movable door. The movable shaft enables the movable door to be turned over and opened, so that mud blocks dried at the bottom of the clamping cavity can be cleaned timely, and the clamping lock is used for locking the movable door.
Further, the dust treatment unit further comprises sealing strips, the sealing strips are fixedly connected to the upper side edge and the left side edge and the right side edge of the movable door, and the sealing strips are attached to the gap between the movable door and the dust treatment box. The sealing strip is used for improving the tightness between the movable door and the dust treatment box.
Further, still include gas flowmeter and PLC controller, a gas flowmeter is installed to flange's that is located the downside neck front end, gas flowmeter's flexible end stretches into flange neck centre, the PLC controller is installed in dust treatment case's left side, gas flowmeter's signal output part is connected with the data transmission interface electricity of PLC controller, the input of motor and electric spray head passes through the PLC controller and is connected with external power source's output electricity. The gas flowmeter is used for detecting the flow of the flue gas in the inner pipeline, and the PLC adjusts the power of the motor and the electric spray head according to the flow of the flue gas, so that the efficiency of the electrical device is matched with the flow of the gas.
Compared with the prior art, the utility model has the beneficial effects that: the ash blocking preventing structure of the air preheater has the following advantages:
1. the device has a reliable dust separation unit, and can separate dust during the rising of the flue gas: the inner pipeline is used for passing smoke, the mounting column is used for mounting the mounting ring, the mounting ring is used for mounting and fixing the motor through the connecting rod, the motor drives the wind impeller to rotate, so that the passing smoke is spirally lifted, and the dust with heavier mass in the smoke can be subjected to a centrifugal force larger than that of the fog, so that the dust can be separated from the fog, and the separated dust can enter the clamping chamber through the dust through hole;
2. the device has a reliable dust treatment unit, can spray water mist to condense separated dust into mud drops, so that the dust can be effectively treated to prevent the air preheater from being blocked: the water pipe connector is used for introducing a water source into the electric spray head, the electric spray head condenses dust in a scattering state by spraying water mist, the water drops adhere to the dust and fall into the bottom of the clamping chamber, and the water at the bottom of the clamping chamber is evaporated due to the high temperature effect of smoke, so that dry mud blocks are left at the bottom, and the movable shaft enables the movable door to be turned over and opened so as to clean the dry mud blocks at the bottom of the clamping chamber;
3. the utility model has a reliable dust separation unit, can separate dust in the rising process of flue gas, and has a reliable dust treatment unit, and the separated dust can be condensed into mud drops by spraying water mist, so that the dust can be effectively treated to prevent the air preheater from being blocked.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a schematic diagram of the oblique upper side structure of the present utility model;
fig. 3 is a partial cross-sectional view of the present utility model.
In the figure: the dust treatment device comprises a dust treatment box 1, a connecting flange 2, a dust separation unit 3, an inner pipeline 31, a mounting column 32, a mounting ring 33, a connecting rod 34, a motor 35, a wind impeller 36, a dust through hole 37, a connecting block 38, a fixing bolt 39, a dust treatment unit 4, a clamping chamber 41, an electric spray head 42, a water pipe interface 43, a movable shaft 44, a movable door 45, a 46 clamping lock 47, a sealing strip 47, a gas flowmeter 5 and a PLC controller 6.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1-3, the present embodiment provides a technical solution: an ash blocking prevention structure of an air preheater comprises a dust treatment box 1, a dust separation unit 3 and a dust treatment unit 4;
dust treatment box 1: the middle positions of the upper end and the lower end are fixedly connected with a connecting flange 2;
dust separation unit 3: the dust treatment box 1 comprises an inner pipeline 31, mounting columns 32, mounting rings 33, connecting rods 34, motors 35, fan blades 36 and dust through holes 37, wherein the vertical inner pipeline 31 is embedded in the middle position of the inner part of the dust treatment box 1, four vertical mounting columns 32 are fixedly connected to the inner wall of the inner pipeline 31 in a circumferential array manner, clamping notches are formed in the front, back, left and right directions of the mounting rings 33, the mounting rings 33 are mounted at the lower end of the inner part of the inner pipeline 31 and are clamped with the mounting columns 32 through the clamping notches, the motors 35 are mounted at the central position of the mounting rings 33, the motors 35 are fixedly connected with the inner wall of the mounting rings 33 through four connecting rods 34 arranged in a circumferential outer array manner, the output shafts of the motors 35 are downwards arranged and are fixedly provided with the fan blades 36 at the end parts of the motors, and a plurality of vertical dust through holes 37 are formed in the circumferential array at the middle upper side of the inner wall of the inner pipeline 31;
dust treatment unit 4: are installed at both front and rear sides of the dust treating box 1.
The dust treatment box 1 is used for providing the place of handling dust in the flue gas, flange 2 is used for dust treatment box 1 to be connected with outside flue gas pipeline, inside pipeline 31 is used for the passage of flue gas, the erection column 32 is used for the installation of collar 33, collar 33 passes through connecting rod 34 to install and fix motor 35, motor 35 is through driving wind impeller 36 rotation, and then make the flue gas spiral that passes rise, the heavier dust of quality in the flue gas can receive bigger centrifugal force than fog, thereby make the dust can separate with fog, the dust after the separation can enter into clamp cavity 41 through dust through-hole 37, thereby dust treatment unit 4 is used for spraying water smoke and congeals the dust into mud drop, and then can effectively handle the dust, in order to prevent to block up the air preheater.
The dust separating unit 3 further comprises a connection block 38 and fixing bolts 39, an L-shaped connection block 38 is mounted at each of the positions adjacent to the four mounting posts 32 at the upper end of the mounting ring 33, and both ends of the L-shaped connection block 38 are fixedly connected with the mounting ring 33 and the mounting posts 32 through the fixing bolts 39, respectively. The connection block 38 is fixedly connected between the mounting ring 33 and the mounting post 32 by means of a fixing bolt 39.
The dust treatment unit 4 comprises a clamping chamber 41, an electric spray head 42 and a water pipe connector 43, a gap is reserved between the inner pipeline 31 and the outer side of the dust treatment box 1, so that an annular clamping chamber 41 is formed, the electric spray head 42 is embedded and arranged at four corners of the upper end of the dust treatment box 1, the spraying end of the electric spray head 42 extends downwards into the clamping chamber 41, and the water pipe connector 43 is fixedly connected with one end of the electric spray head 42, which is upwards exposed. The clamping chamber 41 is used for processing separated dust, the water pipe connector 43 is used for introducing a water source into the electric spray head 42, the electric spray head 42 condenses the dust in a scattered state by spraying water mist, the water drops adhere to the dust and fall into the bottom of the clamping chamber 41, and the water at the bottom of the clamping chamber 41 is evaporated due to the high temperature of the flue gas, so that dry and bonded mud blocks are left at the bottom.
The dust treatment unit 4 further comprises a movable shaft 44, a movable door 45 and a clamping lock 46, the front end and the rear end of the dust treatment box 1 are respectively provided with the movable door 45, the movable door 45 is movably connected with the dust treatment box 1 through the movable shaft 44 at the lower side, and the clamping lock 46 is arranged at the upper side of the movable door 45. The movable shaft 44 enables the movable door 45 to be turned over and opened, so that the mud cake dried at the bottom of the clamping chamber 41 can be cleaned timely, and the clamping lock 46 is used for locking the movable door 45.
The dust treatment unit 4 further comprises a sealing strip 47, the sealing strips 47 are fixedly connected to the upper side edge and the left side edge and the right side edge of the movable door 45, and the sealing strip 47 is attached to a gap between the movable door 45 and the dust treatment box 1. The sealing strip 47 serves to improve the tightness between the movable door 45 and the dust treatment box 1.
Still include gas flowmeter 5 and PLC controller 6, a gas flowmeter 5 is installed to the neck front end that is located flange 2 of downside, and the flexible end of gas flowmeter 5 stretches into flange 2 neck centre, and PLC controller 6 is installed in the left side of dust treatment case 1, and the signal output part of gas flowmeter 5 is connected with PLC controller 6's data transmission interface electricity, and motor 35 and electric spray head 42's input passes through PLC controller 6 and is connected with external power source's output electricity. The gas flowmeter 5 is used for detecting the flow rate of the flue gas in the inner pipeline 31, and the PLC controller 6 adjusts the power of the motor 35 and the electric spray head 42 according to the flow rate of the flue gas, so that the efficiency of the electrical device is matched with the flow rate of the flue gas.
The utility model provides an ash blocking prevention structure of an air preheater, which has the following working principle: the connecting flange 2 is used for connecting the dust treatment box 1 with an external flue gas pipeline, the internal pipeline 31 is used for passing flue gas, the mounting column 32 is used for mounting the mounting ring 33, the mounting ring 33 is used for mounting and fixing the motor 35 through the connecting rod 34, and the connecting block 38 is used for realizing the fixed connection between the mounting ring 33 and the mounting column 32 through the fixing bolt 39; the motor 35 drives the wind impeller 36 to rotate, so that the passing smoke is spirally lifted, and the dust with heavier mass in the smoke is subjected to a centrifugal force larger than that of the mist, so that the dust can be separated from the mist, and the separated dust can enter the clamping chamber 41 through the dust through hole 37. The clamping chamber 41 is used for processing separated dust, the water pipe connector 43 is used for introducing a water source into the electric spray head 42, the electric spray head 42 condenses the scattered dust by spraying water mist, the water drops adhere to the dust to the bottom of the clamping chamber 41, and the water at the bottom of the clamping chamber 41 is evaporated due to the high temperature of the flue gas, so that dry and sticky mud blocks are left at the bottom; the movable shaft 44 enables the movable door 45 to be turned over and opened, so that the dry mud blocks at the bottom of the clamping cavity 41 can be cleaned timely, the clamping lock 46 is used for locking the movable door 45, and the sealing strip 47 is used for improving the tightness between the movable door 45 and the dust treatment box 1; the gas flowmeter 5 is used for detecting the flow rate of the flue gas in the inner pipeline 31, and the PLC controller 6 adjusts the power of the motor 35 and the electric spray head 42 according to the flow rate of the flue gas, so that the efficiency of the electrical device is matched with the flow rate of the flue gas.
It is noted that the PLC controller 6 disclosed in the above embodiment controls the motor 35 and the operation of the electric spray head 42 using methods commonly used in the art.
The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present utility model.
Claims (6)
1. An anti-blocking ash structure of an air preheater is characterized in that: comprises a dust treatment box (1), a dust separation unit (3) and a dust treatment unit (4);
dust treatment case (1): a connecting flange (2) is fixedly connected at the middle position of the upper end and the lower end;
dust separation unit (3): contain inside pipeline (31), erection column (32), collar (33), connecting rod (34), motor (35), fan impeller (36) and dust through-hole (37), the inside intermediate position department of dust treatment case (1) inlays and establishes and install a vertical inside pipeline (31), and circumference array fixedly connected with four vertical erection columns (32) on the inner wall of inside pipeline (31), joint notch has all been seted up in four directions around collar (33), the inside lower extreme of inside pipeline (31) is installed in collar (33) and is linked with erection column (32) through the joint notch, motor (35) are installed in the central point department of collar (33), four connecting rods (34) that motor (35) set up through circumference outside array are fixedly connected with the inner wall of collar (33), the output shaft of motor (35) sets up down and installs and be fixed with fan impeller (36) at its tip, a plurality of vertical dust through-holes (37) are seted up to the well upside circumference of inside pipeline (31) inner wall;
dust treatment unit (4): are arranged on the front side and the rear side of the dust treatment box (1).
2. The ash blocking prevention structure of an air preheater according to claim 1, wherein: the dust separation unit (3) further comprises a connecting block (38) and fixing bolts (39), the upper end of the mounting ring (33) and the positions adjacent to the four mounting columns (32) are provided with L-shaped connecting blocks (38), and two ends of each L-shaped connecting block (38) are respectively fixedly connected with the mounting ring (33) and the mounting columns (32) through the fixing bolts (39).
3. The ash blocking prevention structure of an air preheater according to claim 1, wherein: the dust treatment unit (4) comprises a clamping chamber (41), an electric spray head (42) and a water pipe connector (43), a gap is reserved between the inner pipeline (31) and the outer side of the dust treatment box (1), so that an annular clamping chamber (41) is formed, the electric spray head (42) is embedded and installed at four corners of the upper end of the dust treatment box (1), the spray end of the electric spray head (42) extends downwards into the clamping chamber (41), and one end of the electric spray head (42) which is exposed upwards is fixedly connected with the water pipe connector (43).
4. The ash blocking prevention structure of an air preheater according to claim 1, wherein: the dust treatment unit (4) further comprises a movable shaft (44), a movable door (45) and a clamping lock (46), the front end and the rear end of the dust treatment box (1) are respectively provided with the movable door (45), the movable door (45) is movably connected with the dust treatment box (1) through the movable shaft (44) at the lower side, and the clamping lock (46) is arranged at the upper side of the movable door (45).
5. The ash blocking prevention structure of an air preheater according to claim 4, wherein: the dust treatment unit (4) further comprises sealing strips (47), the sealing strips (47) are fixedly connected to the upper side edge and the left side edge and the right side edge of the movable door (45), and the sealing strips (47) are attached to gaps between the movable door (45) and the dust treatment box (1).
6. An air preheater anti-ash blocking structure according to claim 3, wherein: still include gas flowmeter (5) and PLC controller (6), a gas flowmeter (5) is installed to the neck front end that is located flange (2) of downside, the flexible end of gas flowmeter (5) stretches into flange (2) neck centre, PLC controller (6) is installed in the left side of dust treatment case (1), the signal output part of gas flowmeter (5) is connected with the data transmission interface electricity of PLC controller (6), the input of motor (35) and electric spray head (42) is connected with external power source's output electricity through PLC controller (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321142684.XU CN219674266U (en) | 2023-05-12 | 2023-05-12 | Anti-ash blocking structure of air preheater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321142684.XU CN219674266U (en) | 2023-05-12 | 2023-05-12 | Anti-ash blocking structure of air preheater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219674266U true CN219674266U (en) | 2023-09-12 |
Family
ID=87926148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321142684.XU Active CN219674266U (en) | 2023-05-12 | 2023-05-12 | Anti-ash blocking structure of air preheater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219674266U (en) |
-
2023
- 2023-05-12 CN CN202321142684.XU patent/CN219674266U/en active Active
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