CN219534240U - Explosion-proof device for large oil immersed transformer oil tank - Google Patents
Explosion-proof device for large oil immersed transformer oil tank Download PDFInfo
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- CN219534240U CN219534240U CN202320720581.0U CN202320720581U CN219534240U CN 219534240 U CN219534240 U CN 219534240U CN 202320720581 U CN202320720581 U CN 202320720581U CN 219534240 U CN219534240 U CN 219534240U
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- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model relates to an explosion-proof device for a large oil immersed transformer oil tank, and belongs to the technical field of transformer manufacturing equipment. The technical proposal is as follows: the oil tank wall (1) is connected with the tank cover (2), one side of the oil tank wall (1) and one side of the tank cover (2) are respectively provided with a first tank edge (3) and a second tank edge (4), and the first tank edge (3) and the second tank edge (4) are connected through a first tank edge switch module (8) in a mortise-tenon mode; a plurality of groups of positioning blocks (10) are arranged on the inner side of the first box edge (3), the number of each group of positioning blocks (10) is two, and the box edge switch module (8) is arranged between each group of two positioning blocks; the case cover (2) is provided with an explosion-proof control case (5) and a temperature sensor (7), and the explosion-proof control case is connected with the temperature sensor through a data line (6). The beneficial effects of the utility model are as follows: the case cover and the wall of the oil tank are connected in a mortise-tenon mode, so that the case cover and the wall of the oil tank are convenient to install and detach; the explosion of the oil tank can be effectively prevented, the explosion loss is reduced to a certain extent, and the search of the fault cause after the accident is facilitated.
Description
Technical Field
The utility model relates to an explosion-proof device for a large oil immersed transformer oil tank, and belongs to the technical field of transformer manufacturing equipment.
Background
When faults such as serious overload, short circuit, insulation damage and the like occur in the large oil immersed transformer, a large amount of energy is released by a fault arc, the temperature and the pressure in the oil tank are suddenly increased due to vaporization and decomposition of insulating oil, the oil tank bulges, cracks and even explodes, secondary disasters such as oil injection and fire disaster are caused, the safety of operation and maintenance personnel, surrounding equipment and environment is seriously threatened, and the power grid device and method are paralyzed, so that immeasurable loss is caused. Once an explosion accident occurs, the damage to the site is extremely large, so the accident cause is difficult to be studied.
Explosion-proof design and research of large-scale oil immersed transformer is the difficult problem at home and abroad all the time. When serious electrical faults occur in the large-sized oil immersed transformer, the large-sized transformer oil tank releases gas and oil during faults by installing a pressure release valve, but the pressure release valve has limited pressure release capability, and the safety of the oil tank and other components cannot be ensured when explosion occurs.
Disclosure of Invention
The utility model aims to provide an explosion-proof device for a large oil immersed transformer oil tank, which is convenient to install and detach, can effectively prevent the oil tank from explosion, reduces explosion loss to a certain extent, is convenient for searching fault reasons afterwards, and solves the problems in the background technology.
The technical scheme of the utility model is as follows:
an explosion-proof device for a large oil immersed transformer tank comprises a tank wall, a tank cover, a first tank edge, a second tank edge, an explosion-proof control tank, a temperature sensor, a tank edge switch module and a positioning block, wherein the tank wall is connected with the tank cover; the box edge switch module is arranged between each two positioning blocks; the case cover is provided with an explosion-proof control case and a temperature sensor, and the explosion-proof control case is connected with the temperature sensor through a data line.
The explosion-proof control box comprises a first switch, a liquid crystal display screen, a protective shell, a wiring terminal and a base, wherein the explosion-proof control box is connected with a box cover through the base, the protective shell and the base are connected through bolts, the first switch and the liquid crystal display screen are arranged at the top of the protective shell, the wiring terminal is arranged on the side face of the protective shell, and the wiring terminal is connected with a data line.
The protection shell is internally provided with a power supply, an internet of things card and a first control unit, the first control unit can store, analyze and make action instructions of opening or closing the first box edge and the second box edge on the collected temperature data, and the internet of things card sends the instructions to the box edge switch module, so that the opening or closing of the first box edge and the second box edge is realized.
The temperature sensor comprises an output end, a metal shell, a mounting flange and a temperature measuring probe, the temperature sensor is connected with the tank cover through the mounting flange, the metal shell is in threaded connection with the mounting flange, the upper end and the lower end of the metal shell are respectively provided with the output end and the temperature measuring probe, the output end is connected with a data line, the temperature measuring probe penetrates through the tank cover and stretches into transformer oil in a transformer oil tank, and the temperature of the oil is detected in real time.
The box edge switch module comprises a shell, a switch II, a support plate, a sliding shaft and a slideway, wherein the shell is of a right trapezoid structure, one side of the shell, which is close to the box edge II, is an inclined plane I, one side of the shell, which is far away from the box edge II, is a right-angle surface, and the inclined plane I of the shell is matched with the box edge II; the casing sets up between every two locating pieces of group, and the right angle face of casing is equipped with switch two and recess, is equipped with the extension board in the recess, and extension board one end is contacted with case edge one, and the extension board other end is equipped with the sliding shaft, is equipped with the slide on the both sides cell wall of recess respectively, and sliding shaft both ends slide the setting respectively in the slide to realize opening and packing up of extension board.
The shell is internally provided with a motor and a second control unit, the motor provides motion power for the sliding shaft, the second control unit receives an action instruction sent by the explosion-proof control box and can automatically control the second switch to open or retract the support plate.
The box edge I is provided with a large groove, the box edge II is provided with a right trapezoid boss, the positioning block, the box edge switch module and the right trapezoid boss are arranged in the large groove, one side of the right trapezoid boss, which is close to the shell, is provided with a second inclined plane, and the second inclined plane of the right trapezoid boss is matched with the first inclined plane of the shell.
The box is provided with a small groove on the first edge, and a sealing rubber strip is arranged in the small groove.
The oil tank wall and the tank cover are connected with other tank edges except the first tank edge and the second tank edge through bolts of the tank cover.
According to the utility model, the temperature sensor is welded on the box cover, and the temperature sensor can be arranged according to the multiple points of the temperature hot spot positions; welding the explosion-proof control box to a designated position of the box cover; aligning the first tank edge of the oil tank wall with the second tank edge of the tank cover, and connecting the tank cover with the other tank edges except the first tank edge and the second tank edge of the oil tank wall through the tank cover bolts; the temperature sensor is connected with the explosion-proof control box through a data line; the box edge switch module is arranged between each group of two positioning blocks of the large groove of the box edge I, so that the box edge I and the box edge II are in mortise-tenon connection; after the installation is finished, a first switch of the explosion-proof control box and a second switch of the box edge switch module are opened to enable the first switch and the second switch to be in a working state; the explosion-proof control box displays, stores and analyzes the acquired real-time temperature data, and sends out a command for closing the first box edge and the second box edge when the temperature is normal; when electrical faults occur and the oil temperature rises suddenly, the explosion-proof control box sends an action instruction for opening the first box edge and the second box edge to the box edge switch module, so that the first box edge and the second box edge which are connected through mortise and tenon can be automatically and rapidly opened, explosion of the oil tank is effectively prevented, explosion loss is reduced, and searching of fault reasons after the event is facilitated.
The beneficial effects of the utility model are as follows: the case cover and the wall of the oil tank are connected in a mortise-tenon mode, so that the case cover and the wall of the oil tank are convenient to install and detach; when the transformer normally operates, the temperature sensor transmits real-time oil temperature in the transformer oil tank to the explosion-proof control box through a data line, and the explosion-proof control box displays, analyzes and records the temperature data in real time; when serious electrical faults occur to the transformer and the oil temperature rises suddenly, the explosion-proof control box sends an action instruction of opening the box edge to the box edge switch module through analysis, and the support plate of the box edge switch module is retracted into the shell, so that the first box edge and the second box edge connected through mortise and tenon can be automatically and rapidly opened, the explosion of the oil tank can be effectively prevented, the explosion loss is reduced to a certain extent, and the finding of fault reasons after the accident is facilitated.
Drawings
FIG. 1 is a schematic view of the overall structure of the present utility model;
FIG. 2 is a schematic view of a partial structure of the present utility model
FIG. 3 is a schematic view of the structure of the first and second case edges of the present utility model;
FIG. 4 is a schematic diagram of the explosion-proof control box structure of the present utility model;
FIG. 5 is a schematic diagram of the temperature sensor structure of the present utility model;
FIG. 6 is a schematic diagram of the switch module structure of the box edge of the present utility model;
in the figure: the oil tank wall 1, the tank cover 2, the tank edge one 3, the tank edge two 4, the explosion-proof control tank 5, the switch one 501, the liquid crystal display 502, the protective casing 503, the wiring terminal 504, the bolt 505, the base 506, the data wire 6, the temperature sensor 7, the output end 701, the metal shell 702, the mounting flange 703, the temperature measuring probe 704, the tank edge switch module 8, the shell 801, the switch two 802, the support plate 803, the sliding shaft 804, the slide 805, the tank cover bolt 9, the positioning block 10 and the sealing rubber strip 11.
Detailed Description
The utility model is further illustrated by the following examples in conjunction with the accompanying drawings.
In this embodiment, referring to fig. 1-6, an explosion-proof device for a large-scale oil immersed transformer tank includes a tank wall 1, a tank cover 2, a tank edge one 3, a tank edge two 4, an explosion-proof control tank 5, a temperature sensor 7, a tank edge switch module 8 and a positioning block 10, where the tank wall 1 is connected with the tank cover 2, and one sides of the tank wall 1 and the tank cover 2 are respectively provided with a tank edge one 3 and a tank edge two 4, and the tank edge one 3 and the tank edge two 4 are connected through the tank edge switch module 8; a plurality of groups of positioning blocks 10 are welded on the inner side of the first box edge 3, two positioning blocks 10 are arranged in each group, a box edge switch module 8 is arranged between each two positioning blocks, and mortise-tenon connection between the second box edge 4 and the upper box edge and the lower box edge of the first box edge 3 is realized; the tank cover 2 is provided with an explosion-proof control box 5 and a temperature sensor 7, the explosion-proof control box 5 and the temperature sensor 7 are connected through a data line 6, and real-time data of the oil temperature in the oil tank are collected.
Preferably, a first switch 501, a liquid crystal display 502, a protective housing 503, a wiring terminal 504 and a base 506 are arranged outside the explosion-proof control box 5, a power supply, an internet of things card and a first control unit are arranged in the explosion-proof control box 5, the explosion-proof control box 5 is arranged on the box cover 2 through the base 506, the base 506 is welded and fixed on the box cover 2, the protective housing 503 is arranged on the base 506 through bolts 505 arranged at four corners, the first switch 501 and the liquid crystal display 502 are arranged at the top of the protective housing 503, the wiring terminal 504 is arranged on the side surface of the protective housing 503, and the wiring terminal 504 is connected with the data wire 6; the switch I501 is used for realizing the opening and closing functions of the explosion-proof control box 5, and the control unit I can store, analyze and make action instructions for opening or closing the box edge I3 and the box edge II 4 on collected temperature data; the liquid crystal display 502 can display the real-time temperature of the transformer oil in the oil tank, so that operation and maintenance personnel can conveniently check the transformer oil; the explosion-proof control box is internally provided with a power supply and an Internet of things card, and the Internet of things card sends instructions to the box edge switch module 8, so that the box edge one 3 and the box edge two 4 are opened or closed.
Preferably, the temperature sensor 7 comprises an output end 701, a metal shell 702, a mounting flange 703 and a temperature measuring probe 704, wherein the mounting flange 703 of the temperature sensor 7 is welded on the case cover 2, and can be arranged in multiple points according to the positions of temperature hot spots; the inner side of the mounting flange 703 is provided with a threaded hole, the outer side of the metal shell 702 is provided with threads, the metal shell 702 is made of stainless steel materials, and the metal shell 702 is in threaded connection with the mounting flange 703, so that the mounting and the dismounting are convenient; the upper end and the lower end of the metal shell 702 are respectively provided with an output end 701 and a temperature measuring probe 704, and the temperature measuring probe 704 passes through the tank cover 2 downwards to be detected into transformer oil in a transformer oil tank, so as to detect the oil temperature in real time; the output end 701 is externally connected with a data line 6 to the explosion-proof control box 5, and transmits the data measured by the temperature measuring probe 704 to the explosion-proof control box 5.
Preferably, the box edge switch module 8 comprises a shell 801, a switch II 802, a support plate 803, a sliding shaft 804, a slideway 805, a motor and a control unit II, wherein the shell 801 adopts Q355 steel plates, outer side paint is sprayed, the shell 801 is of a right trapezoid structure, and the cross section of the shell 801 is of a right trapezoid shape and is matched with the shapes of the box edge II 4 and the box edge I3; one side of the shell 801, which is close to the second box edge 4, is an inclined surface I, one side of the shell 801, which is far away from the second box edge 4, is a right-angle surface, and the inclined surface I of the shell 801 is matched with the second box edge 4; the shell 801 is arranged in the positioning block 10 of the box edge 3, so that the installation is simple and convenient; a second switch 802 and a groove are arranged on the right-angle surface of the shell 801, a support plate 803 is arranged in the groove, the support plate 803 is made of Q355 steel, one end of the support plate 803 is contacted with the first box edge 3, a cylindrical hole is arranged at the other end of the support plate 803, and the support plate 803 is installed in a matched mode with the sliding shaft 804; after the supporting plate 803 is opened, the limiting steel right propped against the outer side of the first tank edge 3 enables the second tank edge 4 of the tank cover and the first tank edge 3 of the tank wall to be closed, and mortise-tenon connection is achieved; when the support plate 803 is retracted into the shell 801, the constraint effect of the support plate 803 on the second tank edge 4 of the tank cover and the first tank edge 3 of the tank wall is eliminated, and the position of the tank edge can be opened under the action of oil pressure; slide ways 805 are respectively arranged on the groove walls at two sides of the groove, and a sliding shaft 804 is arranged in the slide ways 805 and can move up and down along the slide ways 805 so as to realize the opening and the retraction of the support plate 803; the shell 801 is internally provided with a motor and a second control unit, the motor provides motion power for the sliding shaft 804, the second control unit receives an action instruction sent by the explosion-proof control box 5 and can automatically control the second switch 802 to open or retract the support plate 803; the second switch 802 can be automatically controlled or manually operated, and after the box edge switch module 8 is mounted at a designated position, the second switch can be manually opened to enable the support plate to be in an open state. During operation, the temperature sensor 7 transmits real-time oil temperature in the transformer oil tank to the explosion-proof control box 5 through the data line 6, the explosion-proof control box 5 analyzes and records the temperature data, and the temperature data is displayed in real time through the liquid crystal display 502 to give action instructions to the tank edge switch module 8. When a serious electrical fault occurs in the transformer and the temperature of the oil rises suddenly and exceeds a preset normal operation temperature range of the transformer, the explosion-proof control box 5 sends an action instruction for opening the first box edge 3 and the second box edge 4 to the box edge switch module 8 through the built-in internet of things card, so that the first box edge 3 and the second box edge 4 can be automatically and quickly opened; the automatic explosion-proof device can store and display oil temperature data in real time, can respond in time when in fault, can effectively prevent the oil tank from explosion, reduces explosion loss, and is convenient for finding fault reasons afterwards.
Preferably, the box edge 3 is made of Q355 steel, special anti-corrosion paint is sprayed on the outer side of the box edge 3, a large groove is formed in the box edge 3, the inner side of the box edge 3 is welded with the oil tank wall 1, a small groove is formed in the side, close to the oil tank wall, of the box edge 3, and a sealing rubber strip 11 is arranged in the small groove; the outer side of the large groove of the box edge 3 is provided with a limiting function, a plurality of groups of positioning blocks 10 are welded in the large groove, and the inner side of each group of two positioning blocks 10 is provided with a box edge switch module 8; the second box edge 4 is made of Q355 steel, special anti-corrosion paint is sprayed on the outer side of the second box edge, a right trapezoid boss is arranged on the second box edge 4, a right trapezoid waist of the right trapezoid boss is arranged close to the inner side of a large groove of the first box edge 3, and a bevel edge waist of the right trapezoid boss is matched with the switch module 8 of the first box edge.
Preferably, the tank wall 1 and the tank cover 2 are connected by a tank cover bolt 9 along the tank edges except the first tank edge 3 and the second tank edge 4.
The application method of the utility model comprises the following steps:
(1) the mounting flange 703 of the temperature sensor 7 is welded to the case cover 2, and can be arranged according to the positions of the temperature hot spots at multiple points; welding the base 506 of the explosion-proof control box 5 to a designated position of the box cover 2;
(2) aligning the first tank edge 3 of the oil tank wall 1 with the second tank edge 4 of the tank cover, and installing a tank cover bolt 9 into a bolt hole of the tank cover 2 and the tank edge of the oil tank wall 1 which are required to be fixedly connected through bolts;
(3) the temperature sensor 7 is connected with the mounting flange 703 through threads on the outer side of the metal shell 702; the explosion-proof control box 5 is mounted to its base 506 by four bolts 505 through its protective housing 503; the output end 701 of the temperature sensor 7 is connected with the wiring terminal 504 of the explosion-proof control box 5 by a data wire 6;
(4) the box edge switch module 8 is arranged between each group of two positioning blocks 10 of the large groove of the box edge one 3, so that the box edge one 3 and the box edge two 4 are in mortise-tenon connection;
(5) after the hardware is installed, a first switch 501 of the explosion-proof control box 5 and a second switch 802 of the box edge switch module 8 are opened to enable the explosion-proof control box to be in a working state; the explosion-proof control box 5 displays, stores and analyzes the acquired real-time temperature data, and sends out an instruction for closing the first box edge 3 and the second box edge 4 when the temperature is normal; when electrical faults occur and the oil temperature rises suddenly, the explosion-proof control box 5 sends an action instruction for opening the first box edge 3 and the second box edge 4 to the box edge switch module 8, so that the first box edge 3 and the second box edge 4 which are connected through mortise and tenon can be automatically and quickly opened, the explosion of the oil tank is effectively prevented, the explosion loss is reduced, and the search of fault reasons after the fact is facilitated.
In practical application, the box edge two 4 is designed with a right trapezoid boss, the box edge one 3 is integrally designed with a large groove matched with the right trapezoid boss, and the outer side of the large groove has a limiting function; a plurality of groups of positioning blocks 10 are welded in the large groove, and the inner sides of two positioning blocks 10 of each group are provided with a box edge switch module 8; after the supporting plate 803 of the box edge switch module 8 is opened, the steel material just props up to the outer side of the box edge 3, so that the box cover and the wall of the oil tank are connected in a mortise-tenon mode, and the installation and the disassembly are convenient. When the transformer normally operates, the temperature sensor 7 transmits the real-time oil temperature in the transformer oil tank to the explosion-proof control box 5 through the data line 6, and the explosion-proof control box 5 displays, analyzes and records the temperature data in real time; when serious electrical faults occur to the transformer and the oil temperature rises suddenly, the explosion-proof control box 5 is used for analyzing, when the real-time oil temperature exceeds the preset normal operation oil temperature range of the transformer, the action instructions of opening the box edge one 3 and the box edge two 4 are sent to the box edge switch module 8, and at the moment, the support plate 803 of the box edge switch module 8 is retracted into the shell 801, so that the box edge one 3 and the box edge two 4 which are connected through mortise and tenon can be automatically and quickly opened, the explosion of the oil tank can be effectively prevented, the explosion loss is reduced to a certain extent, and the searching of fault reasons after the fact is facilitated.
Claims (6)
1. An explosion-proof equipment for large-scale oil-immersed transformer tank, characterized by: the anti-explosion device comprises an oil tank wall (1), a tank cover (2), a first tank edge (3), a second tank edge (4), an anti-explosion control tank (5), a temperature sensor (7), a tank edge switch module (8) and a positioning block (10), wherein the oil tank wall (1) is connected with the tank cover (2), one side of the oil tank wall (1) and one side of the tank cover (2) are respectively provided with the first tank edge (3) and the second tank edge (4), and the first tank edge (3) and the second tank edge (4) are connected through a tenon-and-mortise joint of the tank edge switch module (8); a plurality of groups of positioning blocks (10) are arranged on the inner side of the first box edge (3), the number of each group of positioning blocks (10) is two, and the box edge switch module (8) is arranged between each group of two positioning blocks; the explosion-proof control box (5) and the temperature sensor (7) are arranged on the box cover (2), and the explosion-proof control box (5) and the temperature sensor (7) are connected through a data line (6).
2. The explosion-proof device for a large oil immersed transformer tank according to claim 1, wherein: explosion-proof control box (5) contain switch one (501), LCD (502), protective housing (503), binding post (504) and base (506), explosion-proof control box (5) are connected with case lid (2) through base (506), protective housing (503) and base (506) are connected through bolt (505), protective housing (503) top is equipped with switch one (501) and LCD (502), protective housing (503) side is equipped with binding post (504), binding post (504) are connected with data line (6).
3. An explosion-proof device for a large oil immersed transformer tank according to claim 1 or 2, characterized in that: temperature sensor (7) contain output (701), metal casing (702), mounting flange (703) and temperature probe (704), temperature sensor (7) are connected with case lid (2) through mounting flange (703), metal casing (702) and mounting flange (703) threaded connection, metal casing (702) upper end and lower extreme are equipped with output (701) and temperature probe (704) respectively, output (701) are connected with data line (6), temperature probe (704) pass in case lid (2) stretch into transformer oil in the transformer tank.
4. An explosion protection device for a large oil immersed transformer tank according to claim 3, characterized in that: the box edge switch module (8) comprises a shell (801), a switch II (802), a support plate (803), a sliding shaft (804) and a slide rail (805), wherein the shell (801) is of a right trapezoid structure, one side of the shell (801) close to the box edge II (4) is an inclined plane I, one side of the shell (801) far away from the box edge II (4) is a right angle surface, and the inclined plane I of the shell (801) is matched with the box edge II (4); the shell (801) is arranged between every two positioning blocks (10), a second switch (802) and a groove are arranged on the right-angle surface of the shell (801), a support plate (803) is arranged in the groove, one end of the support plate (803) is in contact with the first box edge (3), a sliding shaft (804) is arranged at the other end of the support plate (803), sliding ways (805) are respectively arranged on the groove walls at two sides of the groove, and two ends of the sliding shaft (804) are respectively arranged in the sliding ways (805) in a sliding way.
5. The explosion-proof device for a large oil immersed transformer tank of claim 4, wherein: the box edge I (3) is provided with a large groove, the box edge II (4) is provided with a right trapezoid boss, the positioning block (10), the box edge switch module (8) and the right trapezoid boss are arranged in the large groove, one side of the right trapezoid boss, which is close to the shell (801), is provided with a second inclined plane, and the second inclined plane of the right trapezoid boss is matched with the first inclined plane of the shell (801).
6. The explosion-proof device for a large oil immersed transformer tank of claim 5, wherein: the box edge one (3) is provided with a small groove, and a sealing rubber strip (11) is arranged in the small groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320720581.0U CN219534240U (en) | 2023-04-04 | 2023-04-04 | Explosion-proof device for large oil immersed transformer oil tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320720581.0U CN219534240U (en) | 2023-04-04 | 2023-04-04 | Explosion-proof device for large oil immersed transformer oil tank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219534240U true CN219534240U (en) | 2023-08-15 |
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ID=87583736
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320720581.0U Active CN219534240U (en) | 2023-04-04 | 2023-04-04 | Explosion-proof device for large oil immersed transformer oil tank |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219534240U (en) |
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2023
- 2023-04-04 CN CN202320720581.0U patent/CN219534240U/en active Active
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