CN114088872B - Turbulence fire extinguishing partition experimental device - Google Patents
Turbulence fire extinguishing partition experimental device Download PDFInfo
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- CN114088872B CN114088872B CN202111438515.6A CN202111438515A CN114088872B CN 114088872 B CN114088872 B CN 114088872B CN 202111438515 A CN202111438515 A CN 202111438515A CN 114088872 B CN114088872 B CN 114088872B
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- 238000005192 partition Methods 0.000 title claims abstract description 19
- 238000002474 experimental method Methods 0.000 claims abstract description 10
- 239000011521 glass Substances 0.000 claims description 3
- 230000001629 suppression Effects 0.000 claims 4
- 239000007789 gas Substances 0.000 abstract description 68
- 238000007789 sealing Methods 0.000 abstract description 2
- 239000003086 colorant Substances 0.000 abstract 1
- 238000009423 ventilation Methods 0.000 abstract 1
- 238000002485 combustion reaction Methods 0.000 description 18
- 239000011261 inert gas Substances 0.000 description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 10
- 239000003795 chemical substances by application Substances 0.000 description 10
- 239000001301 oxygen Substances 0.000 description 10
- 229910052760 oxygen Inorganic materials 0.000 description 10
- 239000000446 fuel Substances 0.000 description 5
- 230000006978 adaptation Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000001464 adherent effect Effects 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/12—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using combustion
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/28—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture specially adapted for farming
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biochemistry (AREA)
- Molecular Biology (AREA)
- Analytical Chemistry (AREA)
- Combustion & Propulsion (AREA)
- General Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
Abstract
The invention discloses a turbulent fire extinguishing partition experimental device, which comprises an air box, a connecting plate and a partition plate, wherein the outer end of the connecting plate is fixedly connected with the inner wall of the air box, and the inner end of the connecting plate is fixedly connected with the outer end of the partition plate. According to the fan blade type vortex flame device, the baffle plate not only plays a role in controlling gas circulation and flow velocity, but also has a role in sealing gas, 2 to 4 kinds of gas can be filled according to the needs of experiments to carry out experiments, experimental diversity is increased, more comparison fire extinguishing performance experiments can be carried out on various fire extinguishing gases under the same condition, three air inlet pipelines are closed, one ventilation pipeline is opened, fire extinguishing gas is introduced, the situation that a scene firefighter can only extinguish a fire on one side due to the limitation of the fire is simulated, the scene fire extinguishing device has guiding significance on scene fire according to experimental data, the gas inlet speed and the air inlet size are dynamically changed, and the observation of characteristic influences on flame structures, flow fields, colors and the like due to the change of the gas flow velocity is completed.
Description
Technical Field
The invention relates to the technical field of fire fighting devices, in particular to a turbulent fire extinguishing partition experimental device.
Background
Turbulent flame usually occurs in large fire disaster in large cities, particularly fire whirlwind exists in the wild and forest fire disaster more commonly, the research on the property change of the turbulent flame and the influence on the surrounding environment are significant to the fire safety, the current research on the turbulent flame experimental device is generally used in a heat-driven type and a mechanical-driven type, wherein the heat-driven type adopts four walls and a crack device, the principle is that after the fuel is ignited, the flame consumes surrounding oxygen through combustion, air in the device is heated to move upwards, so that the pressure in the combustion body is reduced to form pressure difference, the pressure difference forces surrounding fresh air to enter the combustion body through a slit, the entering air quickly forms an adherent tangential circulation around a fire source due to the surrounding design of the surrounding slit, the fresh air enters the fire source area along the transverse tangential direction to maintain combustion, the flame flow field is influenced by the surrounding circular flowing air flow to form turbulent flame, turbulent flame generating conditions exist, a plurality of generated gas whirlpools exist in different directions, certain fluid with friction force or dragging force are generated in different gases, and the whirlpool surface is applied to the bottom of the whirlpool surface to form a horizontal whirlpool movement.
The conventional turbulent fire extinguishing test device has the defects that the gas consumption during combustion cannot be accurately known, the application amount and the gas component concentration of inert gas or gas extinguishing agent during extinguishing turbulent flame and the movement change of a gas flow field cannot be determined, and the influence of the air inlet speed and the gas flow change of mixed gas flow with certain component extinguishing agent on the characteristics of turbulent flame such as height, width, stretching length, vibration frequency, flame color and the like cannot be easily determined.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the invention provides a turbulent fire extinguishing partition experimental device, which solves the problems of quantitative gas introduction, dynamic observation of influence on the whole turbulent flame area caused by changing gas flow, a series of flame structure changes such as flame height, width, stretching length, vibration frequency, flame color and the like when inert gas or other gas extinguishing agents are used for extinguishing turbulent flame, addition concentration and the like when the extinguishing agents can extinguish turbulent flame of different fuels.
(II) technical scheme
In order to achieve the above purpose, the invention is realized by the following technical scheme: the utility model provides a subregion experimental apparatus of putting out a fire of torrent, includes gas tank, connecting plate and baffle, one side of connecting plate and the inner wall fixed connection of gas tank to one side of baffle and one side fixed connection of connecting plate, the top fixedly connected with roof of gas tank to the bottom fixedly connected with bottom plate of gas tank, the top of connecting plate and baffle all with the bottom fixed connection of roof to the bottom of connecting plate and baffle all with the top fixed connection of bottom plate, the gas pocket has all been seted up around in the bottom plate inside to the inside of four gas pockets all communicates with the inside of gas tank, the inside sliding connection of connecting plate has the baffle to the slot with baffle looks adaptation has been seted up to the inside of roof, the recess with the baffle looks adaptation has been seted up at the top of bottom plate.
Preferably, the outer appearance of the gas tank is a closed cylinder, and the gas tank is made of transparent glass.
Preferably, a chute matched with the baffle is formed in the connecting plate, a connecting groove matched with the baffle is formed in one side of the baffle, and one side of the baffle is in sliding connection with the inside of the connecting groove.
Preferably, the connecting plate is a rectangular plate with a length of 0.082m, and the partition plate is an arc plate with a radius of 90 degrees and a length of 0.068 m.
Preferably, the height of the air box is 0.54m, the height of the baffle plate is 0.56m, and the thicknesses of the top plate and the bottom plate are 0.005m.
Preferably, the lengths of the slot and the groove are 0.0336m, and the length of the baffle plate is 0.0168m.
Preferably, the connecting plates and the partition plates are arranged in the air box, four connecting plates and four partition plates are distributed at equal angles with respect to the central axis of the air box, the inside of the air box is separated by the four connecting plates and the four partition plates in a central symmetry mode, the inside of the air box is divided into four air sections, and the inside of the four air holes are respectively communicated with the inside of the four air sections.
Preferably, a through hole is formed in the top plate, and the through hole is communicated with the air box.
(III) beneficial effects
The invention provides a turbulent fire extinguishing partition experimental device. Compared with the prior art, the method has the following beneficial effects:
(1) The baffle plate provided by the invention has the effects of controlling the gas circulation and the flow rate in a sliding manner, sealing the gas, filling 2 to 4 kinds of gas for experiments according to the needs of experiments, increasing the experimental diversity, comparing various fire extinguishing gases under the same condition, performing fire extinguishing performance experiments, closing three air inlet pipelines, opening one air inlet pipeline and introducing fire extinguishing gas, simulating the situation that a scene firefighter can extinguish a fire only at one side due to the limitation of the terrain, and having guiding significance for scene fire extinguishment according to experimental data.
(2) The invention can dynamically change the gas inlet speed and the size of the air inlet, and complete the observation of the influence of the change of the gas flow rate on the typical characteristics of flame form, structure, color and the like, the gas partition in the gas box can ensure that oxygen, air, inert gas and other gas extinguishing agents are stored in the gas box at the same time, and the gas extinguishing agents mixed with specific component concentration are sucked into the combustion zone of turbulent flame by matching with the baffle plate, so that the dynamic influence of different gas types, component proportioning concentration and the like on the form, structure, color and the like of turbulent flame can be compared and studied.
(3) The gas with the color mark is introduced into the gas box, so that the flow characteristics and the track of the gas are observed.
Drawings
FIG. 1 is a perspective view of the structure of a zone experiment device for turbulent fire extinguishing according to the present invention;
FIG. 2 is an exploded view of the structure of the experimental device for the zone of turbulent fire extinguishing according to the present invention;
fig. 3 is a top view of the internal structure of the gas box of the present invention.
In the figure, 1-gas box, 2-connecting plate, 3-baffle, 4-top plate, 5-bottom plate, 6-air hole, 7-baffle, 8-slot, 9-groove, 10-chute, 11-connecting groove and 12-through hole.
Detailed Description
The following description of the embodiments of the present invention 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 invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-3, the embodiment of the invention provides a technical scheme: a turbulent fire extinguishing partition experimental device comprises an air box 1, a connecting plate 2 and a baffle plate 3, wherein the connecting plate 2 and the baffle plate 3 are positioned in the air box 1, four connecting plates 2 and four baffle plates 3 are distributed at equal angles relative to the central axis of the air box 1, the inside of the air box 1 is divided into four air sections by the four connecting plates 2 and the four baffle plates 3 in a central symmetry mode, the inside of the air box 1 is communicated with the inside of the four air sections respectively, the height of the air box 1 is 0.54m, the height of a baffle plate 7 is 0.56m, the thicknesses of a top plate 4 and a bottom plate 5 are 0.005m, a chute 10 matched with the baffle plate 7 is arranged in the inside of the connecting plate 2, a connecting groove 11 matched with the baffle plate 7 is arranged on one side of the baffle plate 3, one side of the baffle plate 7 is in sliding connection with the inside of the connecting groove 11, the connecting plate 2 adopts a rectangular plate with the length of 0.082m, the baffle plate 3 adopts an arc plate with the radius of 90 degrees and the length of 0.068m, the outside of the air box 1 is a closed cylinder, the air box 1 is made of transparent glass, one side of the connecting plate 2 is fixedly connected with the inner wall of the air box 1, one side of the baffle plate 3 is fixedly connected with one side of the connecting plate 2, the top of the air box 1 is fixedly connected with the top plate 4, the inside of the top plate 4 is provided with a through hole 12, the inside of the through hole 12 is communicated with the inside of the air box 1, the bottom of the air box 1 is fixedly connected with the bottom plate 5, the tops of the connecting plate 2 and the baffle plate 3 are fixedly connected with the bottom of the top plate 4, the bottoms of the connecting plate 2 and the baffle plate 3 are fixedly connected with the top of the bottom plate 5, the periphery of the inside of the bottom plate 5 is provided with air holes 6, the insides of the four air holes 6 are fixedly connected with the inside of the air box 1, the inside of the connecting plate 2 is slidingly connected with the baffle plate 7, and slot 8 with baffle 7 looks adaptation is seted up to the inside of roof 4, and slot 8 is 0.0336m with the length of recess 9 to baffle 7's length is 0.0168m, and the recess 9 with baffle 7 looks adaptation is seted up at the top of bottom plate 5, and the content that does not make detailed description in this specification all belongs to the prior art that the person skilled in the art knows simultaneously.
When in use, the length of the slot 8 and the groove 9 is 0.0336m, the length of the baffle 7 is 0.0168m, and the length of the gas inlet is 0.0168m, so that the transverse sliding of the baffle 7 can gradually block the gas from entering the gas tank 1 and achieve the effect of complete blocking, when the four baffles 7 completely slide away from the air inlet, the fuel is ignited and put into the gas tank 1, the fuel is positioned at the top center of the bottom plate 5 for combustion, the gas pipeline inputs oxygen or air into the gas tank 1 through the four air holes 6 on the bottom surface of the bottom plate 5, part of the oxygen is consumed by combustion, and the air is heated to move upwards at the same time, so that the pressure in the combustion body is reduced to form a pressure difference, the pressure difference forces the gas in the gas interval to enter the combustion body, and the entering gas rapidly forms a tangential circulation around a fire source due to the arc-shaped circular wall design in the gas tank 1, so as to generate turbulent flame, the conventional experiment for recording the characteristics of flame color, flame structure, flame heat radiation and the like can be carried out according to the method, simultaneously, four baffles 7 are slowly slid into a connecting groove 11 at the same speed, the influence of gas flow change on turbulent flame can be dynamically observed, an air conveying pipeline respectively inputs oxygen or air into a gas zone in the gas box 1 through four air holes 6 on the bottom surface of a bottom plate 5, fuel is ignited and put into the gas box 1, the baffles 7 slide away from an air inlet of the oxygen or air zone to enable the two oxygen or air zones to be communicated with a combustion zone, the baffles 7 slide into air inlets of inert gas or other gas extinguishing agent zones to enable the two inert gas or other gas extinguishing agent zones to be blocked from the combustion zone, partial oxygen is consumed due to combustion, the air is heated to move upwards at the same time, the pressure in the combustion body is reduced, and the pressure difference forces the gas in the combustion-supporting gas zone to enter the combustion zone, because the arc-shaped circular wall design in the gas box 1 enables the entering gas to quickly form a tangential circulation around a fire source, turbulent flame is generated, after the flame is stabilized, the opposite side baffle plates 7 slide into the air inlet of an oxygen or air interval, the opposite side baffle plates 7 slide away from the air inlet of an inert gas or other gas fire extinguishing agent interval, so that two oxygen or air intervals are blocked from a combustion interval, the two inert gas or other gas fire extinguishing agents are communicated with the combustion interval, the inert gas can enter the combustion interval under the action of pressure difference, the action and influence of the inert gas or fire extinguishing gas on the turbulent flame can be dynamically observed outside, the three baffle plates 7 slide into the air inlet, only the baffle plates 7 at one inert gas interval slide away, the condition that people can only provide fire extinguishing materials at one side during actual fire extinguishing can be simulated, the influence data of the inert gas interval on turbulent flame is recorded, and the actual fire extinguishing is guided.
Claims (5)
1. The utility model provides a subregion experimental apparatus of torrent putting out a fire, includes gas tank, connecting plate and baffle, the outer end of connecting plate and the inner wall fixed connection of gas tank, the inner of connecting plate and the outer end fixed connection of baffle, its characterized in that: the top and the bottom of the air box are respectively and fixedly connected with a top plate and a bottom plate, the tops of the connecting plate and the partition plate are fixedly connected with the bottom of the top plate, the bottoms of the connecting plate and the partition plate are fixedly connected with the top of the bottom plate, air holes are formed in the bottom plate, the inside of the air box is communicated with the outside through the air holes, the inner side of the connecting plate is slidably connected with a baffle plate, a slot matched with the baffle plate is formed in the inner side of the top plate, and a groove matched with the baffle plate is formed in the top of the bottom plate;
the inner side of the connecting plate is provided with a sliding groove matched with the baffle, the outer side of the baffle is provided with a connecting groove matched with the baffle, and one side of the baffle is in sliding connection with the inside of the connecting groove;
the slot and the groove are vertically corresponding to each other;
the connecting plates and the partition plates are positioned in the air box and are distributed at equal angles relative to the central axis of the air box, the inside of the air box is separated by the four connecting plates and the four partition plates in a central symmetry mode, the inside of the air box is divided into four air sections, and the four air sections are respectively communicated with the outside through four air holes;
the center of roof has seted up the through-hole, and the inside of through-hole communicates with the inside of gas tank.
2. The turbulent fire suppression zone experiment device of claim 1, wherein: the partition plate is an arc plate; adjacent connecting plates are mutually perpendicular.
3. The turbulent fire suppression zone experiment device of claim 2, wherein: the radian of the baffle plate is 0.5 pi.
4. A turbulent fire suppression experimental device according to claim 1, characterized in that: the outside of the air box is in a closed cylinder, and the air box is made of transparent glass.
5. A turbulent fire suppression experimental device according to claim 1, characterized in that: the height of the air box is 0.54m, the height of the baffle plate is 0.56m, and the thicknesses of the top plate and the bottom plate are 0.005m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111438515.6A CN114088872B (en) | 2020-12-18 | 2020-12-18 | Turbulence fire extinguishing partition experimental device |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011505167.5A CN112717309B (en) | 2020-12-18 | 2020-12-18 | Fan blade type turbulent fire extinguishing device |
| CN202111438515.6A CN114088872B (en) | 2020-12-18 | 2020-12-18 | Turbulence fire extinguishing partition experimental device |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202011505167.5A Division CN112717309B (en) | 2020-12-18 | 2020-12-18 | Fan blade type turbulent fire extinguishing device |
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| Publication Number | Publication Date |
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| CN114088872A CN114088872A (en) | 2022-02-25 |
| CN114088872B true CN114088872B (en) | 2024-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011505167.5A Active CN112717309B (en) | 2020-12-18 | 2020-12-18 | Fan blade type turbulent fire extinguishing device |
| CN202111438515.6A Active CN114088872B (en) | 2020-12-18 | 2020-12-18 | Turbulence fire extinguishing partition experimental device |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011505167.5A Active CN112717309B (en) | 2020-12-18 | 2020-12-18 | Fan blade type turbulent fire extinguishing device |
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| Country | Link |
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| CN (2) | CN112717309B (en) |
| WO (1) | WO2022127931A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112717309B (en) * | 2020-12-18 | 2021-10-08 | 郑州大学 | Fan blade type turbulent fire extinguishing device |
Citations (4)
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| ITMI20040740A1 (en) * | 2004-04-15 | 2004-07-15 | Ecoenergetics S R L | AUTOMATIC ANALYZER FOR NITROGEN DETECTION FROM ORGANIC COMPOUNDS |
| CN101968220A (en) * | 2010-10-28 | 2011-02-09 | 河北工业大学 | Low nitrogen oxide burning process as well as burning device and application |
| CN105757662A (en) * | 2014-12-20 | 2016-07-13 | 天津市天发机械加工有限公司 | Rotatably-extinguished alcohol lamp |
| CN110095562A (en) * | 2019-04-23 | 2019-08-06 | 云南农业大学 | Dual-Phrase Distribution of Gas olid visualization combustion furnace and corrosion chamber with purging function |
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| AU675953B2 (en) * | 1992-06-30 | 1997-02-27 | Combustion Controls, Inc. | Flame arrestor apparatus |
| FR2889292B1 (en) * | 2005-07-26 | 2015-01-30 | Optimise | METHOD AND INSTALLATION FOR COMBUSTION WITHOUT SUPPORT OF POOR COMBUSTIBLE GAS USING A BURNER AND BURNER THEREFOR |
| FR2903169B1 (en) * | 2006-06-29 | 2011-11-11 | Snecma | DEVICE FOR INJECTING A MIXTURE OF AIR AND FUEL, COMBUSTION CHAMBER AND TURBOMACHINE HAVING SUCH A DEVICE |
| CN103839287B (en) * | 2013-11-26 | 2016-09-28 | 北京航空航天大学 | A kind of Equations of Turbulence enriches the method for flame simulating details |
| CN110823584B (en) * | 2019-11-06 | 2024-05-28 | 天津大学 | Experimental device for realizing multi-angle and multi-working-condition impact of laminar flow or turbulent flame on wall surface |
| CN211292004U (en) * | 2019-11-06 | 2020-08-18 | 天津大学 | Experimental device for realizing multi-angle and multi-working-condition impact of laminar flow or turbulent flow flame on wall surface |
| CN212016510U (en) * | 2020-04-17 | 2020-11-27 | 重庆力杰消防工程有限公司 | Gas fire extinguishing device |
| CN111916236A (en) * | 2020-07-15 | 2020-11-10 | 中国核动力研究设计院 | Modular hydrogen explosion experiment research system and method with circulation loop |
| CN111999428A (en) * | 2020-08-20 | 2020-11-27 | 清华大学 | Constant volume combustion bomb for measuring turbulent flame propagation speed of liquid fuel |
| CN112717309B (en) * | 2020-12-18 | 2021-10-08 | 郑州大学 | Fan blade type turbulent fire extinguishing device |
-
2020
- 2020-12-18 CN CN202011505167.5A patent/CN112717309B/en active Active
- 2020-12-18 CN CN202111438515.6A patent/CN114088872B/en active Active
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2021
- 2021-12-19 WO PCT/CN2021/139432 patent/WO2022127931A1/en active Application Filing
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| ITMI20040740A1 (en) * | 2004-04-15 | 2004-07-15 | Ecoenergetics S R L | AUTOMATIC ANALYZER FOR NITROGEN DETECTION FROM ORGANIC COMPOUNDS |
| CN101968220A (en) * | 2010-10-28 | 2011-02-09 | 河北工业大学 | Low nitrogen oxide burning process as well as burning device and application |
| CN105757662A (en) * | 2014-12-20 | 2016-07-13 | 天津市天发机械加工有限公司 | Rotatably-extinguished alcohol lamp |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2022127931A1 (en) | 2022-06-23 |
| CN112717309A (en) | 2021-04-30 |
| CN112717309B (en) | 2021-10-08 |
| CN114088872A (en) | 2022-02-25 |
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