CN111912267A - Magnetic driving heat pipe of nano magnetic fluid - Google Patents
Magnetic driving heat pipe of nano magnetic fluid Download PDFInfo
- Publication number
- CN111912267A CN111912267A CN202010587767.4A CN202010587767A CN111912267A CN 111912267 A CN111912267 A CN 111912267A CN 202010587767 A CN202010587767 A CN 202010587767A CN 111912267 A CN111912267 A CN 111912267A
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- magnetic
- nano
- magnetic fluid
- heat pipe
- heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
- F28D15/0266—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with separate evaporating and condensing chambers connected by at least one conduit; Loop-type heat pipes; with multiple or common evaporating or condensing chambers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
- F28D15/06—Control arrangements therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
- F28D2015/0291—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes comprising internal rotor means, e.g. turbine driven by the working fluid
Abstract
The invention discloses a nano magnetic fluid magnetic driving heat pipe, wherein a magnetic circuit is arranged on one side of an evaporation section of the heat pipe, and a heat source and the magnetic circuit are oppositely arranged, so that fluid in the pipeline is driven by the action of magnetic force generated by magnetic field gradient while being subjected to thermomagnetic action to complete circulation.
Description
[ technical field ] A method for producing a semiconductor device
The invention belongs to the technical field of heat energy exchange, and relates to a magnetic driving heat pipe of a nano magnetic fluid.
[ background of the invention ]
The heat pipes widely used at present are mainly siphon heat pipes and gravity heat pipes, which are also called as cored heat pipes and coreless heat pipes. At the evaporation section of the siphon heat pipe, the working liquid in the pipe core is heated and evaporated, heat is taken away, the heat is latent heat of evaporation of the working liquid, vapor flows to the condensation section of the heat pipe from the central channel, is condensed into liquid, releases latent heat at the same time, and flows back to the evaporation section under the action of capillary force. In this way, a closed cycle is completed, thereby transferring a large amount of heat from the heating section to the heat dissipation section. For gravity heat pipes, the back flow of the working liquid can be satisfied by gravity, and a wick with a capillary structure is not needed.
The siphon heat pipe drives fluid to flow in the pipe bundle by means of surface tension, but has the problems of difficult starting and easy damage of a capillary; the gravity heat pipe provides stable power by using a gravity field, but limits the installation position and direction of the heat pipe. Therefore, how to provide a heat pipe which is convenient to use, not easy to damage and not affected by the installation position and direction is a problem that needs to be solved urgently by those skilled in the art. Meanwhile, although it is not uncommon to apply the nano-magnetic fluid to the conventional heat pipe, most of the related applications focus on the superior heat exchange capability compared with the common fluid, and the aspect of driving by using the magnetic performance of the nano-magnetic fluid involves less.
[ summary of the invention ]
The invention aims to overcome the defects of the prior art and provides a nano magnetic fluid magnetic driving heat pipe, which is used for solving the technical problems that the heat pipe in the prior art is inconvenient to use, easy to damage and limited by the installation position.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a magnetic driving heat pipe of nano magnetic fluid comprises an evaporation section and a condensation section which are communicated, wherein the output end of the evaporation section is communicated with the input end of a gas pipeline, the output end of the gas pipeline is communicated with the input end of the condensation section, the output end of the condensation section is communicated with the input end of a liquid pipeline, and the output end of the liquid pipeline is connected with the input end of the evaporation section;
a heat source is arranged on one side of the evaporation section, a magnetic circuit is arranged on the other side of the evaporation section, and the magnetic circuit and the heat source are oppositely arranged on two sides of the evaporation section;
a cold source is arranged on one side of the condensing section;
and nano magnetic fluid flows in the evaporation section, the gas pipeline, the condensation section and the liquid pipeline.
The invention is further improved in that:
preferably, the magnetic circuit is a permanent magnet.
Preferably, be provided with first three-way valve on the gas pipeline, be provided with the second three-way valve on the liquid pipeline, be provided with the liquid reserve tank between first three-way valve and the second three-way valve, the liquid reserve tank is parallelly connected with the condenser section, carries nanometer magnetic fluid in the liquid reserve tank.
Preferably, a cooling device is arranged on the liquid storage tank.
Preferably, a diaphragm pump is provided between the reservoir and the second three-way valve.
Preferably, a second flow meter is provided between the diaphragm pump and the second three-way valve.
Preferably, a thermometer is arranged on the evaporation section; the gas pipeline is provided with a first flowmeter.
Preferably, a pressure gauge and a third flow meter are provided on the liquid pipe.
Preferably, the nano magnetic fluid is an iron-based nano magnetic fluid, and the volume fraction of the ferroferric oxide nano particles in the nano magnetic fluid is 23%.
Preferably, the gas pipe and the liquid pipe are both wrapped with a heat insulating material.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a nano magnetic fluid magnetic driving heat pipe, wherein a magnetic circuit is arranged on one side of an evaporation section of the heat pipe, and a heat source and the magnetic circuit are oppositely arranged, so that fluid in the pipeline is driven by the action of magnetic force generated by magnetic field gradient while being subjected to thermomagnetic action to complete circulation. In the evaporation section of the heating heat pipe, the nano magnetic fluid in the pipe core enhances heat exchange due to thermomagnetic convection, and meanwhile, the liquid is heated and evaporated to take away heat, and the heat contains heat transfer sensible heat and evaporation latent heat of working liquid. The nano magnetic fluid is a colloid, and the disturbance of the nano magnetic fluid can strengthen the capability of convection heat transfer, so that the heat dissipation of a heat source is enhanced. Colloidal particles in the nano magnetic fluid can be used as a gasification core during evaporation, so that the latent heat of evaporation of the nano magnetic fluid can be excited, and the cooling efficiency of the evaporator is improved. Therefore, the invention can overcome the limitations that the siphon heat pipe is difficult to start and the gravity heat pipe is limited by the position, and plays a more effective heat dissipation role in the field of gravity-free aerospace and the equipment of power machinery bearing certain acceleration; on the other hand, in the aspects of convective heat transfer and the like, the magnetic fluid has higher heat transfer capability and more excellent heat flux density load capability when the phase change occurs, and experiments prove that the nano magnetic fluid has a more uniform temperature field inside during heat transfer; thirdly, the flow of the working medium of the invention is promoted by the magnetic circuit and the external magnetic field, thus reducing the requirement on driving equipment (such as a water diaphragm pump and the like) and greatly reducing the energy consumption and the cost.
Furthermore, the magnetic force is generated by the permanent magnet, the permanent magnet is arranged on one side of the evaporation section, so that magnetic induction intensity distribution with gradient is generated at the evaporation section, and the effect of gravity in the gravity heat pipe can be simulated by combining the thermomagnetic convection characteristic of the nano magnetic fluid, so that magnetic driving is realized.
Furthermore, in the invention, the liquid storage tank is connected in parallel at the condensation section, nano magnetic fluid is loaded in the liquid storage tank, and the liquid storage tank is provided with the cooling device, so that the nano magnetic fluid in the liquid storage tank is continuously cooled, when the cooling effect in the whole pipeline is insufficient, the cooling source of the whole pipeline can be converted into the liquid storage tank from the condensation section through the two three-way valves, and the cooling capacity of the whole heat pipe is increased.
Furthermore, a diaphragm pump is arranged on a pipeline of the liquid storage tank, so that the flow of the nano magnetic fluid entering the whole heat pipe system from the liquid storage tank can be increased, and the heat convection capacity of the whole heat pipe is further enhanced.
Furthermore, each corresponding pipeline is provided with a flow meter, a thermometer, a pressure meter and other measurement monitoring components, so that parameters can be monitored in real time.
Furthermore, the volume fraction of ferroferric oxide particles in the nano magnetic fluid is limited, and the nano magnetic fluid is ensured to have enough magnetism.
Furthermore, except for the pipeline needing heat exchange, the rest pipelines are wrapped with heat insulating materials, so that heat loss is prevented.
[ description of the drawings ]
FIG. 1 is a schematic view of the basic construction of a heat pipe system;
FIG. 2 is a simulated simulation of a heat pipe system;
wherein, the figure (a) is a component layout diagram; (b) the figure is a magnetic force distribution diagram.
1-a heat source; 2-a magnetic circuit; 3-a thermometer; 4-a first flow meter; 5-a first three-way valve; 6-a cold source; 7-a liquid storage tank; 8-diaphragm pump; 9-a second flow meter; 10-a second three-way valve; 11-a third flow meter; 12-a pressure gauge; 13-an evaporation section; 14-gas line; 15-a condensation section; 16-liquid line.
[ detailed description ] embodiments
The invention is described in further detail below with reference to the accompanying drawings:
in the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and encompass, for example, both fixed and removable connections; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, the invention discloses a nano magnetic fluid magnetic driving heat pipe, which comprises a heat source 1, a magnetic circuit 2, a thermometer 3, a first flowmeter 4, a first three-way valve 5, a cold source 6, a liquid storage tank 7, a diaphragm pump 8, a second flowmeter 9, a second three-way valve 10, a third flowmeter 11, a pressure gauge 12, an evaporation section 13, a gas pipeline 14, a condensation section 15 and a liquid pipeline 16.
All pipelines comprise an evaporation section 13, a gas pipeline 14, a condensation section 15 and a liquid pipeline 16 which are sequentially communicated, the communicated pipelines enable the nano magnetic fluid to circularly flow in the pipelines, a heat source 1 and a magnetic circuit 2 are respectively arranged on two sides of the pipeline of the evaporation section 13, and a main pipeline near a cold source 6 is the condensation section; the pipe bodies of all pipelines are made of good heat conducting plastic pipes, in order to ensure that the nano magnetic fluid is fully heated in the evaporation section, the permanent magnet is close to the heat source 1 as much as possible, but the permanent magnet is arranged opposite to the heat source 1 due to the possibility of high-temperature demagnetization, namely the heat source 1 and the magnetic circuit 2 are oppositely arranged at two sides of the pipeline of the evaporation section 13. The remaining gas and liquid lines 14, 16 are wrapped with insulation material, the magnetic circuit 2 is designed to provide a magnetically driven permanent magnet, and the distance between the magnetic circuit 2 and the evaporator section 13 is only required to ensure that the magnetic circuit does not demagnetize.
The outlet pipeline of the evaporation section 13 is connected with a first three-way valve 5, the evaporation section 13 is provided with a first thermometer 3, the actual temperature control range is determined according to the actual application, the target control range of the first thermometer 3 in the embodiment is 0-200 ℃ for measuring the temperature on the evaporation section 13, and when the temperature of the first thermometer 3 is more than 150 ℃, the temperature passes through a first three-way valveThe switching of the through valve 5 and the second three-way valve 10 changes the cooling pipeline of the whole system from the condensing section 15 and the cold source 6 to the liquid storage tank 7; the first flowmeter 4 is arranged on the evaporation section 13 and the gas pipeline 14 of the first three-way valve 5 and is used for measuring the outlet flow, and if the deviation between the mass flow and the third flowmeter 11 is far, the failure blockage in the pipe can be judged. A pipeline between the first three-way valve 5 and the second three-way valve 10 is a condensation section 15, a cold source 6 is arranged outside the condensation section 15, the cold source 6 provides a source of cold air for the condensation section 15, the condensation section 15 is connected with the liquid storage tank 7 in parallel, an inlet of the liquid storage tank 7 is connected with the first three-way valve 5, an outlet of the liquid storage tank 7 is connected with the second three-way valve 10, a diaphragm pump 8 and a second flow meter 9 are arranged between the liquid storage tank 7 and the second three-way valve 10, the second flow meter 9 is used for measuring the flow of the nano magnetic fluid output by the liquid storage tank 7, the third flow meter 11 is used for measuring the inlet flow of the evaporation section 13, and when thermo-magnetic convection without an external power source is adopted, namely when the condensation section 15 is used as a cooling pipeline, the third flow meter 11; when forced convection is adopted by the external power source provided by the diaphragm pump 8, namely the liquid storage tank 7 is used as a cooling source, the flow rate of the second flow meter 9 is adapted to the heat flow density of the heat source 1. A third flow meter 11 and a pressure meter 12 are arranged on a liquid pipeline 16 between the second three-way valve 10 and the evaporation section 13, the main function is to measure whether the output liquid flow of the diaphragm pump 8 meets the requirement, and the target range of the pressure meter 12 in the embodiment is 2 x 105～2×106Pa (absolute pressure), especially when the boiling point of the working medium in the tube needs to be controlled by vacuum degree, the indication of the pressure gauge needs to be ensured to meet the requirement of the saturated vapor pressure taking the temperature as the boiling point; the flowmeter is only used when forced convection is required, the flow rate of the flowmeter corresponds to the heat flow density of the heat source 1, and the working condition parameter is 200W/cm2The wall heat flux density corresponds to a mass flow of 12.5 g/s.
The main pipeline 13 is filled with iron-based nano magnetic fluid, the volume fraction of ferroferric oxide particles in the iron-based nano magnetic fluid is 23%, the heat source 1 is equipment needing heat dissipation, heat is conducted to the evaporation section through the wall surface of the evaporation section 13, the heat source 1 can be electronic equipment such as a CPU (central processing unit) and a high-performance chip, and the heat source 1 is subjected to magnetic insulation treatment in order to ensure that the working performance of the electronic equipment is not influenced by an electromagnetic field of a heat dissipation device; the cold source 6 can select corresponding cold source according to different heat dissipation requirements, if the heat flow is low, cold end natural convection heat dissipation can be adopted, and along with the increase of the heat flow, the cold source 6 can adopt cooling devices such as fan forced convection heat dissipation, immersed cooling, semiconductor thermoelectric refrigeration and the like.
Nanometer magnetic fluid has been placed to liquid reserve tank 7, and when entire system's heat dissipation required was higher, 8 forced convection currents of diaphragm pump were connected to the accessible, increased mass flow, and the increase velocity of flow avoids heat source 1 to heat the gaseous phase, and make full use of phase transition heat transfer improves the Nussel number of wall to increase the heat dissipation capacity, satisfy the heat dissipation requirement. The liquid storage tank 7 is also used as a liquid storage device of the nano magnetic fluid and is used for supplementing the liquid after the magnetic fluid is evaporated.
The working condition of the device can be controlled by measuring and monitoring instruments such as a flowmeter, a thermometer 3, a pressure gauge and the like through the readings of the instruments.
Due to the difference of the heat source 1 and the difference of the nano magnetic fluid, the heat dissipation capability is tested before the actual use.
During testing, the evaporation section 14 must be connected with the liquid storage tank 7, and the liquid diaphragm is pumped into the evaporation section 14 through the diaphragm pump 8 to complete the starting operation of the device, so that the working condition of the evaporation section can be tested, the magnetic field can be finely adjusted, and the optimal working state of the device is further achieved.
The heat pipe is arranged horizontally, and the plane of the heat pipe is basically vertical to the gravity direction, so that the heat pipe is not influenced by the gravity.
Referring to fig. 2, when the magnetic circuit 2 simulated by the computer in the present embodiment is placed beside the evaporation section 13, the magnetic induction intensity distribution inside the evaporation section 13 is gradually decreased from the direction from the magnetic circuit 2 to the heat source 1.
The working process of the invention is as follows:
the nanometer magnetic fluid in the evaporation section is influenced by the magnetic field formed by the magnetic circuit 2, after the nanometer magnetic fluid is heated by the heat source 1, the heat flow is primarily transmitted into the fluid, the temperature of the fluid is increased, but the highest temperature does not reach the boiling point, a temperature field is formed in the fluid, so that the magnetization intensity of the nanometer magnetic fluid is unevenly distributed due to different temperatures, the thermomagnetic convection phenomenon is generated, the fluid working medium generates macroscopic flow, but the mass flow is small, and the flowing heat exchange process in the tube is not stable at the moment; when the temperature of the fluid reaches the boiling point of the base liquid of the nano magnetic fluid, phase change gasification begins to occur to form steam, the magnetization intensity of the steam is far less than that of the nano magnetic fluid, and the magnetic force is discharged by a magnetic field to generate a violent thermomagnetic convection phenomenon, the gas moves to the condensation section 15 through the first flowmeter 4, the mass flow is improved relative to that when the phase change does not occur at the moment, and when the flow in the pipe is stable, the mass flow does not change any more; after the vapor reaches the condensing section 15 through the first three-way valve 5, the vapor is pre-cooled and liquefied in the condensing section 15, and then flows back to the inlet of the evaporation section 13 through the pushing of the vapor and the attraction of the nano magnetic fluid, so that a cycle is formed; or the circulation is realized by combining with the nano magnetic fluid and the oppression of the inflow steam flows back to the inlet of the evaporator.
The physical change process of the nano magnetic fluid magnetic drive heat pipe comprises complex physical processes of driving, heat transfer, convection, phase change and the like. The basic operation is based on the traditional heat pipe, and comprises a heat source, a cold source, a magnetic circuit, a pipeline, an evaporator, a condenser, a diaphragm pump, a three-way valve, a thermometer, a flowmeter, a pressure gauge and other measurement monitoring components.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A nanometer magnetic fluid magnetic drive heat pipe is characterized by comprising an evaporation section (13) and a condensation section (15) which are communicated, wherein the output end of the evaporation section (13) is communicated with the input end of a gas pipeline (14), the output end of the gas pipeline (14) is communicated with the input end of the condensation section (15), the output end of the condensation section (15) is communicated with the input end of a liquid pipeline (16), and the output end of the liquid pipeline (16) is connected with the input end of the evaporation section (13);
a heat source (1) is arranged on one side of the evaporation section (13), a magnetic circuit (2) is arranged on the other side of the evaporation section (13), and the magnetic circuit (2) and the heat source (1) are oppositely arranged on two sides of the evaporation section (13);
a cold source (6) is arranged on one side of the condensing section (15);
and nano magnetic fluid flows in the evaporation section (13), the gas pipeline (14), the condensation section (15) and the liquid pipeline (16).
2. A nano-magnetic fluid magnetic drive heat pipe according to claim 1, wherein the magnetic circuit (2) is a permanent magnet.
3. The nano magnetic fluid magnetic driving heat pipe according to claim 1, wherein a first three-way valve (5) is arranged on the gas pipeline (14), a second three-way valve (10) is arranged on the liquid pipeline (16), a liquid storage tank (7) is arranged between the first three-way valve (5) and the second three-way valve (10), the liquid storage tank (7) is connected with the condensation section (15) in parallel, and nano magnetic fluid is loaded in the liquid storage tank (7).
4. A nano-magnetic fluid magnetic driving heat pipe according to claim 3, characterized in that a cooling device is arranged on the liquid storage tank (7).
5. A nano-magnetic fluid magnetic drive heat pipe according to claim 3, characterized in that a diaphragm pump (8) is arranged between the liquid storage tank (7) and the second three-way valve (10).
6. A nano-magnetic fluid magnetic drive heat pipe according to claim 5, characterized in that a second flowmeter (9) is arranged between the diaphragm pump (8) and the second three-way valve (10).
7. A nano-magnetic fluid magnetic driving heat pipe according to claim 1, wherein a thermometer (3) is arranged on the evaporation section (13); the gas pipeline (14) is provided with a first flowmeter (4).
8. The nano-magnetic fluid magnetic driving heat pipe according to claim 1, wherein a pressure gauge (12) and a third flow meter (11) are arranged on the liquid pipeline (16).
9. The nano-magnetic fluid magnetic driving heat pipe according to claim 1, wherein the nano-magnetic fluid is an iron-based nano-magnetic fluid, and the volume fraction of ferroferric oxide nanoparticles in the nano-magnetic fluid is 23%.
10. The nanomagnetic fluid magnetic drive heat pipe of any one of claims 1-9, wherein the gas line (14) and the liquid line (16) are each coated with a thermally insulating material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010587767.4A CN111912267B (en) | 2020-06-24 | 2020-06-24 | Magnetic driving heat pipe of nano magnetic fluid |
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| CN202010587767.4A CN111912267B (en) | 2020-06-24 | 2020-06-24 | Magnetic driving heat pipe of nano magnetic fluid |
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| CN111912267A true CN111912267A (en) | 2020-11-10 |
| CN111912267B CN111912267B (en) | 2021-12-28 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114216359A (en) * | 2021-10-28 | 2022-03-22 | 中国船舶重工集团公司第七一九研究所 | Electromagnetic drive type heat exchange system |
| CN115121301A (en) * | 2022-01-20 | 2022-09-30 | 电子科技大学 | Device and method for realizing liquid drop transportation on long-range self-circulation magnetic fluid |
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| CN115121301A (en) * | 2022-01-20 | 2022-09-30 | 电子科技大学 | Device and method for realizing liquid drop transportation on long-range self-circulation magnetic fluid |
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| Publication number | Publication date |
|---|---|
| CN111912267B (en) | 2021-12-28 |
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