CN117470464A - Pressure container hot helium leakage detection device and leakage detection method thereof - Google Patents
Pressure container hot helium leakage detection device and leakage detection method thereof Download PDFInfo
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- CN117470464A CN117470464A CN202311547587.3A CN202311547587A CN117470464A CN 117470464 A CN117470464 A CN 117470464A CN 202311547587 A CN202311547587 A CN 202311547587A CN 117470464 A CN117470464 A CN 117470464A
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- helium
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- leak detection
- pressure container
- cooler
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- 239000001307 helium Substances 0.000 title claims abstract description 97
- 229910052734 helium Inorganic materials 0.000 title claims abstract description 97
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 title claims abstract description 97
- 238000001514 detection method Methods 0.000 title claims abstract description 57
- 238000010438 heat treatment Methods 0.000 claims abstract description 35
- 239000000919 ceramic Substances 0.000 claims abstract description 30
- 230000001105 regulatory effect Effects 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 7
- 238000004321 preservation Methods 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 6
- 239000004744 fabric Substances 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 4
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000001819 mass spectrum Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
- G01M3/202—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material using mass spectrometer detection systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D31/00—Other cooling or freezing apparatus
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
- G01M3/22—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
- G01M3/226—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for containers, e.g. radiators
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
-
- 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
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention discloses a pressure container hot helium leak detection device and a leak detection method thereof, wherein the pressure container to be detected is sequentially connected with an electric regulating valve, a cooler and a vacuum unit, the cooler is connected with a cold water circulator, the cooler and the vacuum unit are connected through a vacuum tube, and the vacuum tube is connected with a vacuum gauge, a temperature sensor and a helium mass spectrometer; the outer side of the pressure container to be detected is provided with a ceramic heating rope, and the outer side of the pressure container to be detected is provided with a helium cover; the electric regulating valve, the temperature sensor and the control system are matched to control the hot air flow and the temperature through the electric regulating valve, so that the vacuum unit and the helium mass spectrometer can work normally, and the stability of the hot helium leakage detection process is improved.
Description
Technical Field
The invention belongs to the technical field of pressure container hot helium leakage detection, and particularly relates to a pressure container hot helium leakage detection device and a leakage detection method thereof.
Background
In a part of pressure container equipment operated at a high temperature, helium mass spectrum leakage detection is required to be carried out at the working temperature (more than 300 ℃) after the equipment is manufactured, and the following problems exist in hot helium detection of the pressure container at the high temperature:
1. when the pressure container is used for hot helium detection, the helium mass spectrometer and the vacuumizing unit can be damaged when the allowable working temperature is exceeded, the air temperature passing through the helium mass spectrometer and the vacuumizing unit must be lower than 45 ℃, the existing pressure container hot helium leakage detection device cannot accurately regulate the air temperature passing through the helium mass spectrometer and the vacuumizing unit, so that the helium mass spectrometer and the vacuumizing unit are easy to break down, and the leakage detection operation is influenced;
2. when the existing pressure container is used for hot helium test, a common helium cover cannot resist high temperature, so that the hot helium test of the pressure container is affected;
therefore, we propose a pressure vessel hot helium leak detection device and a leak detection method thereof.
Disclosure of Invention
The invention aims to provide a pressure container hot helium leakage detection device and a leakage detection method thereof, which are used for solving the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions: the hot helium leak detection device for the pressure container comprises the pressure container to be detected, wherein the pressure container to be detected is sequentially connected with an electric regulating valve, a cooler and a vacuum unit, the cooler is connected with a cold water circulator, the cooler is connected with the vacuum unit through a vacuum tube, and the vacuum tube is connected with a vacuum gauge, a temperature sensor and a helium mass spectrometer;
the outside of the pressure container to be detected is provided with a ceramic heating rope, and the outside of the pressure container to be detected is provided with a helium cover;
the electric regulating valve and the temperature sensor are connected with a control system, and the control system adjusts the opening of the electric regulating valve according to a real-time monitoring temperature signal fed back by the temperature sensor so as to regulate the temperature of the hot air flow.
Preferably, the electric control valve is connected with the cooler through a hose, and the hose is a corrugated pipe.
Preferably, the ceramic heating ropes are spirally wound on the outer side of the pressure vessel to be detected, and a space is reserved between the spirally wound ceramic heating ropes.
Preferably, an insulating layer is arranged on the outer layer of the ceramic heating rope spirally wound on the outer side of the pressure vessel to be detected.
Preferably, the helium cover is a cover body structure prepared by adopting high-temperature-resistant airtight high-temperature cloth.
A leak detection method of a pressure vessel hot helium leak detection device comprises the following steps:
A. preparation before hot helium leak detection:
connecting and fixing the pressure vessel to be detected and a hot helium leak detection device, spirally winding a ceramic heating rope on the outer side of the pressure vessel to be detected, and attaching a binding heat insulation layer on the outer layer of the spirally wound ceramic heating rope;
B. heating a pressure container to be detected:
the ceramic heating rope is electrified and started, so that the ceramic heating rope heats the pressure container to be detected until the temperature required by the hot helium leak detection is reached, and then the temperature is kept for 24 hours according to the preset temperature of the hot helium leak detection;
C. cooling and vacuumizing:
the cold water circulator and the vacuum unit are opened, the vacuum unit starts vacuumizing treatment, hot air in the pressure vessel to be detected enters the vacuum unit to be discharged through the electric regulating valve, the cooler and the vacuum tube in sequence until the vacuum degree detected by the vacuum gauge meets the vacuum degree required by hot helium leak detection, and the cold water circulator carries out circulating cooling on the cooler in the process, so that the hot air passing through the cooler is cooled to be within the allowable working temperature of the vacuum unit and the helium mass spectrometer;
D. helium filling and helium leak detection:
covering the helium cover outside the pressure container to be detected, sealing and fixing the helium cover, then filling helium with a certain concentration into the helium cover, and then opening the helium mass spectrometer to perform helium leak detection on the pressure container to be detected.
Preferably, in step C, the electric control valve, the temperature sensor and the control system cooperate to control the flow of hot air through the electric control valve:
when the temperature sensor monitors that the temperature signal exceeds the preset upper limit value in real time, the temperature sensor transmits the temperature signal to a control system, and the control system timely reduces the opening of the electric regulating valve, so that the cooler completely cools the hot air to be within the allowable working temperature of the vacuum unit and the helium mass spectrometer;
when the temperature sensor monitors that the temperature signal is lower than the preset lower limit value in real time, the temperature sensor transmits the temperature signal to a control system, and the control system timely increases the opening degree of the electric regulating valve, so that the hot air is kept within the allowable working temperature of the vacuum unit and the helium mass spectrometer when passing through the cooler.
Compared with the prior art, the invention has the beneficial effects that:
1. in the invention, the electric regulating valve, the temperature sensor and the control system are matched to control the hot air flow passing through the electric regulating valve: when the temperature sensor monitors that the temperature signal exceeds 45 ℃ in real time, the temperature sensor transmits the temperature signal to a control system, and the control system timely reduces the opening of the electric regulating valve, so that the cooler 3 completely cools the hot air to below 45 ℃; when the temperature sensor monitors that the temperature signal is lower than the preset lower limit value in real time, the temperature sensor transmits the temperature signal to a control system, the control system timely increases the opening of the electric regulating valve, the vacuumizing efficiency is improved, and the hot air is kept within 45 ℃ when passing through the cooler, so that the vacuum unit and the helium mass spectrometer can work normally, and the stability in the process of detecting leakage of hot helium is improved;
2. according to the invention, the ceramic heating rope is spirally wound on the outer side of the pressure vessel to be detected, and the heat preservation layer is arranged on the outer layer of the spirally wound ceramic heating rope, so that the pressure vessel to be detected is uniformly heated, the heat preservation effect of the pressure vessel to be detected is improved, and the problems of nonuniform overall heating and poor heat preservation effect of the pressure vessel to be detected are solved;
3. the helium cover prepared by adopting the high-temperature-resistant airtight high-temperature cloth is used, so that the helium cover can be bent and spliced, air leakage is avoided, and the pressure container to be detected can perform helium leakage detection operation at a high temperature.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure: 1. a pressure vessel to be inspected; 2. an electric control valve; 3. a cooler; 4. a vacuum unit; 5. a cold water circulator; 6. a vacuum tube; 7. a vacuum gauge; 8. a temperature sensor; 9. a helium mass spectrometer; 10. a ceramic heating rope; 11. a helium shield; 12. a hose; 13. and a heat preservation layer.
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, the pressure vessel hot helium leak detection device provided by the invention comprises a pressure vessel 1 to be detected, wherein the pressure vessel 1 to be detected is sequentially connected with an electric control valve 2, a cooler 3 and a vacuum unit 4, the electric control valve 2 and the cooler 3 are connected through a hose 12, the hose 12 is a corrugated pipe, the corrugated pipe is flexible and can be used in a bending way, is resistant to vacuum external pressure and is convenient to connect, the cooler 3 is connected with a cold water circulator 5, the cooler 3 and the vacuum unit 4 are connected through a vacuum pipe 6, and the vacuum pipe 6 is connected with a vacuum gauge 7, a temperature sensor 8 and a helium mass spectrometer 9;
the outer side of the pressure vessel 1 to be detected is provided with a ceramic heating rope 10, the ceramic heating rope 10 is spirally wound on the outer side of the pressure vessel 1 to be detected, a space is reserved between the spirally wound ceramic heating ropes 10, the outer side of the pressure vessel 1 to be detected is positioned on the outer layer of the spirally wound ceramic heating rope 10 and is provided with a heat preservation layer 13, the outer side of the pressure vessel 1 to be detected is provided with a helium cover 11, and the helium cover 11 is of a cover body structure prepared by adopting high-temperature-resistant airtight high-temperature cloth;
according to the invention, the ceramic heating rope 10 is spirally wound on the outer side of the pressure vessel 1 to be detected, and the heat preservation layer 13 is arranged on the outer layer of the spirally wound ceramic heating rope 10, so that the pressure vessel 1 to be detected is uniformly heated, the heat preservation effect of the pressure vessel 1 to be detected is improved, and the problems of nonuniform overall heating and poor heat preservation effect of the pressure vessel 1 to be detected are solved;
the helium cover 11 prepared by adopting the high-temperature-resistant airtight high-temperature cloth is used, so that the helium cover 11 can be bent and spliced, air leakage is avoided, and the pressure container 1 to be detected can perform helium leakage detection operation in a high-temperature state;
the electric regulating valve 2 and the temperature sensor 8 are both connected with a control system, and the control system adjusts the opening of the electric regulating valve 2 according to a real-time monitoring temperature signal fed back by the temperature sensor 8 so as to regulate the temperature of the hot air flow.
In the invention, the electric control valve 2, the temperature sensor 8 and the control system are matched to control the flow rate of hot air passing through the electric control valve 2: when the temperature sensor 8 monitors that the temperature signal exceeds 45 ℃ in real time, the temperature sensor 8 transmits the temperature signal to a control system, and the control system timely reduces the opening of the electric regulating valve 2 to enable the cooler 3 to completely cool the hot air to below 40-45 ℃; when the temperature sensor 8 monitors that the temperature signal is lower than 40 ℃ in real time, the temperature sensor 8 transmits the temperature signal to a control system, the control system timely increases the opening of the electric regulating valve 2, the vacuumizing efficiency is improved, and the hot air is kept within 40-45 ℃ when passing through the cooler 3, so that the vacuum unit 4 and the helium mass spectrometer 9 can work normally, and the stability in the hot helium leak detection process is improved.
The invention provides a leak detection method of a pressure container hot helium leak detection device, which comprises the following steps:
A. preparation before hot helium leak detection:
connecting and fixing the pressure vessel 1 to be detected and a hot helium leak detection device, spirally winding a ceramic heating rope 10 on the outer side of the pressure vessel 1 to be detected, and paving and binding a heat preservation layer 13 on the outer layer of the spirally wound ceramic heating rope 10;
B. heating a pressure container to be detected:
the ceramic heating rope 10 is electrified and started, so that the ceramic heating rope 10 heats the pressure vessel 1 to be detected until the temperature required by the hot helium leak detection is reached, and then the heat preservation is carried out according to the preset heat preservation time of the hot helium leak detection;
C. cooling and vacuumizing:
the cold water circulator 5 and the vacuum unit 4 are opened, the vacuum unit 4 starts vacuumizing treatment, at the moment, hot air in the pressure vessel 1 to be detected enters the vacuum unit 4 to be discharged through the electric regulating valve 2, the cooler 3 and the vacuum tube 6 in sequence until the vacuum degree detected by the vacuum gauge 7 meets the vacuum degree required by hot helium leak detection, and in the process, the cold water circulator 5 carries out circulating cooling on the cooler 3, and the hot air passing through the cooler 3 is cooled to be below 45 ℃;
in step C, the electric control valve 2, the temperature sensor 8 and the control system cooperate to control the flow of hot air through the electric control valve 2:
when the temperature sensor 8 monitors that the temperature signal exceeds 45 ℃ in real time, the temperature sensor 8 transmits the temperature signal to a control system, and the control system timely reduces the opening of the electric regulating valve 2 to enable the cooler 3 to completely cool the hot air to below 45 ℃;
when the temperature sensor 8 monitors that the temperature signal is lower than 40 ℃ in real time, the temperature sensor 8 transmits the temperature signal to a control system, the control system timely increases the opening of the electric regulating valve 2, the vacuumizing efficiency is improved, and the temperature range of the hot air is kept between 40 ℃ and 45 ℃ when the hot air passes through the cooler 3;
D. helium filling and helium leak detection:
the helium cover 11 is covered outside the pressure vessel 1 to be detected and sealed and fixed, then helium gas with a certain concentration is filled into the helium cover 11, and then the helium mass spectrometer 9 is opened to perform helium leak detection on the pressure vessel 1 to be detected.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The hot helium leak detection device for the pressure container is characterized by comprising the pressure container (1) to be detected, wherein the pressure container (1) to be detected is sequentially connected with an electric regulating valve (2), a cooler (3) and a vacuum unit (4), a cold water circulator (5) is connected to the cooler (3), the cooler (3) and the vacuum unit (4) are connected through a vacuum tube (6), and the vacuum tube (6) is connected with a vacuum gauge (7), a temperature sensor (8) and a helium mass spectrometer (9);
the outside of the pressure container (1) to be detected is provided with a ceramic heating rope (10), and the outside of the pressure container (1) to be detected is provided with a helium cover (11);
the electric regulating valve (2) and the temperature sensor (8) are connected with a control system, and the control system adjusts the opening of the electric regulating valve (2) according to a real-time monitoring temperature signal fed back by the temperature sensor (8) so as to regulate the temperature of the hot air flow.
2. The pressure vessel helium leak detection apparatus of claim 1 wherein: the electric control valve (2) is connected with the cooler (3) through a hose (12), and the hose (12) is a corrugated pipe.
3. The pressure vessel helium leak detection apparatus of claim 1 wherein: the ceramic heating ropes (10) are spirally wound on the outer side of the pressure vessel (1) to be detected, and a space is reserved between the spirally wound ceramic heating ropes (10).
4. A pressure vessel helium leak detection apparatus according to claim 3 wherein: the outer layer of the ceramic heating rope (10) which is positioned on the outer side of the pressure vessel (1) to be detected and is spirally wound is provided with an insulating layer (13).
5. The pressure vessel helium leak detection apparatus of claim 1 wherein: the helium cover (11) is of a cover body structure prepared by adopting high-temperature-resistant airtight high-temperature cloth.
6. A method of leak detection of a pressure vessel helium leak detection apparatus according to any one of claims 1 to 5 comprising the steps of:
A. preparation before hot helium leak detection:
connecting and fixing the pressure container (1) to be detected and a hot helium leak detection device, spirally winding a ceramic heating rope (10) on the outer side of the pressure container (1) to be detected, and paving a binding heat insulation layer (13) at a reserved space between the spirally wound ceramic heating ropes (10);
B. heating a pressure container to be detected:
the ceramic heating rope (10) is electrified and started, so that the ceramic heating rope (10) heats the pressure container (1) to be detected until the temperature required by the hot helium leak detection is reached, and then the heat is preserved according to the preset heat preservation time of the hot helium leak detection for 24 hours;
C. cooling and vacuumizing:
the cold water circulator (5) and the vacuum unit (4) are opened, the vacuum unit (4) starts vacuumizing treatment, hot air in the pressure vessel (1) to be detected enters the vacuum unit (4) to be discharged through the electric regulating valve (2), the cooler (3) and the vacuum tube (6) in sequence until the vacuum degree detected by the vacuum gauge (7) meets the vacuum degree required by hot helium leak detection, and the cold water circulator (5) carries out circulating cooling on the cooler (3) in the process, so that the hot air passing through the cooler (3) is cooled to be within the allowable working temperature of the vacuum unit (4) and the helium mass spectrometer (9);
D. helium filling and helium leak detection:
covering the helium cover (11) on the outside of the pressure container (1) to be detected, sealing and fixing the pressure container, then filling helium with a certain concentration into the helium cover (11), and then opening the helium mass spectrometer (9) to detect the helium in the pressure container (1) to be detected.
7. The leak detection method of the pressure vessel helium leak detection apparatus according to claim 6, wherein: in step C, the electric control valve (2), the temperature sensor (8) and the control system are matched to control the flow rate of hot air passing through the electric control valve (2):
when the temperature sensor (8) monitors that the temperature signal exceeds the preset upper limit value in real time, the temperature sensor (8) transmits the temperature signal to a control system, and the control system timely reduces the opening of the electric regulating valve (2) to enable the cooler (3) to completely cool hot air to be within the allowable working temperature of the vacuum unit (4) and the helium mass spectrometer (9);
when the temperature sensor (8) monitors that the temperature signal is lower than the preset lower limit value in real time, the temperature sensor (8) transmits the temperature signal to a control system, the control system timely increases the opening of the electric regulating valve (2) so as to improve the vacuumizing efficiency, and the hot air is kept in the allowable working temperature of the vacuum unit (4) and the helium mass spectrometer (9) when passing through the cooler (3).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311547587.3A CN117470464B (en) | 2023-11-20 | 2023-11-20 | Pressure container hot helium leakage detection device and leakage detection method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311547587.3A CN117470464B (en) | 2023-11-20 | 2023-11-20 | Pressure container hot helium leakage detection device and leakage detection method thereof |
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| CN117470464B CN117470464B (en) | 2024-07-12 |
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