CN114396817B - Liquid metal heat pipe packaging device and method - Google Patents
Liquid metal heat pipe packaging device and method Download PDFInfo
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- CN114396817B CN114396817B CN202210015055.4A CN202210015055A CN114396817B CN 114396817 B CN114396817 B CN 114396817B CN 202210015055 A CN202210015055 A CN 202210015055A CN 114396817 B CN114396817 B CN 114396817B
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- liquid metal
- vacuum
- heat pipe
- valve
- storage tank
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Classifications
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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
- F28D15/0283—Means for filling or sealing heat pipes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
- F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
- F04B37/14—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use to obtain high vacuum
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B41/00—Pumping installations or systems specially adapted for elastic fluids
- F04B41/06—Combinations of two or more pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Vacuum Packaging (AREA)
Abstract
The invention discloses a liquid metal heat pipe packaging device and a liquid metal heat pipe packaging method. The vacuum operation box provides a vacuum environment for filling the heat pipe; the inert gas storage tank provides inert gas; the vacuum pump unit discharges gas in the vacuum operation box and vacuumizes the heat pipe; the liquid metal storage tank stores liquid metal working media; the electromagnetic flowmeter measures the quality of the filled liquid metal working medium; the water oxygen detector, the helium mass spectrometer leak detector and the vacuum gauge detect the water oxygen content, the leakage rate and the vacuum degree in the filling process. The device has the advantages of simple structure, simple and convenient operation, controllable filling quality of liquid metal and high filling vacuum degree of the heat pipe.
Description
Technical Field
The invention relates to the technical field of phase-change heat exchange equipment, in particular to a high-temperature heat pipe working medium filling device and method.
Background
The liquid metal is generally used as a working medium for the high-temperature heat pipe, and the liquid metal heat pipe can be applied to the fields of nuclear reactor systems, aerospace, ferrous metallurgy and the like due to the fact that the melting point and the boiling point of the liquid metal are high. Because the liquid metal is relatively active, the liquid metal is easy to react with air, and the generated oxide can block the pore of the liquid suction core and influence the working performance of the heat pipe. Meanwhile, the working vapor pressure of the liquid metal is low, and the isothermal performance and the heat transmission capacity of the heat pipe can be greatly affected by the presence of non-condensable gas. The design provides a high-temperature heat pipe working medium filling device for the high-temperature heat pipe filling process, and provides a reference for high-quality filling of the high-temperature heat pipe.
Disclosure of Invention
In order to realize high-quality packaging of the liquid metal heat pipe, the invention provides a liquid metal heat pipe packaging device and a liquid metal heat pipe packaging method.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the high-temperature heat pipe working medium filling device comprises a vacuum operation box 100, an inert gas storage tank 200, a vacuum pump unit 300, a liquid metal storage tank 400, a connecting joint 500, a heat pipe 600, a gas inlet valve 201, a water oxygen detector 301, a helium mass spectrometer leak detector 302, a first valve 310, a second valve 320, a neck expansion cavity 311, a vacuum gauge 312, a sealing valve 313, an electromagnetic flowmeter 401 and a packaging valve 402; the inert gas storage tank 200 is connected to the bottom of the vacuum operation box 100 through a gas inlet valve 201, an outlet of the vacuum pump unit 300 is connected with a water oxygen detector 301 and a helium mass spectrum leak detector 302, an inlet pipeline of the vacuum pump unit 300 penetrates into the upper side wall of the vacuum operation box 100 and then is divided into two paths, one path is communicated with the inside of the vacuum operation box 100 through a second valve 320, the other path is sequentially connected with a first valve 310, a neck expansion cavity 311 and a sealing valve 313 and then penetrates out of the bottom of the vacuum operation box 100 to be connected with an upper port of a connecting joint 500, and a vacuum gauge 312 is arranged on the neck expansion cavity 311; the liquid metal storage tank 400 passes through the electromagnetic flowmeter 401 and the packaging valve 402 and passes out of the bottom of the vacuum operation box 100 to be connected with the upper port of the connecting joint 500, and the lower port of the connecting joint 500 is connected with the heat pipe 600.
The inert gas storage tank 200 stores nitrogen, helium, neon, argon or xenon.
The vacuum pump unit 300 is a multi-stage unit including one or more of ion pump, molecular pump, diffusion pump, jet pump, roots pump, rotary vane pump, and piston pump, and vacuum degree cover 10 5 ～10 -8 Of the order of Pa.
The vacuum gauge 312 is a composite vacuum gauge that is a skinAt least two of a Raney vacuum gauge, a resistance vacuum gauge, a thermocouple vacuum gauge, a thermal radiation vacuum gauge, a hot cathode ionization vacuum gauge, a cold cathode ionization vacuum gauge, and a viscous vacuum gauge, and vacuum degree measurement coverage 10 5 ～10 -8 Of the order of Pa.
The liquid metal in the liquid metal storage tank 400 is lithium, sodium, potassium, rubidium, cesium or mercury, and the temperature maintained in the liquid metal storage tank 400 is such that the metal is in a liquid state.
The sealing valve 313 and the packaging valve 402 are liquid metal valves, and the working temperature is 50 ℃ above the melting point of the liquid metal.
The connection joint 500 is a vacuum joint, a high vacuum flange, a threaded joint or a movable joint is selected, and a gasket used for the connection joint 500 is a graphite gasket, an epoxy copper gasket or a steel skeleton graphite gasket.
The baking temperature of the heat pipe 600 is 250+/-50 ℃ before filling, and the filling vacuum degree of the heat pipe 600 is 10 -4 Pa, water oxygen content less than 10 -10 std cc/s, leakage rate lower than 10 -9 std cc/s。
Compared with the prior art, the invention has the following advantages:
the invention adopts the vacuum pump unit 300 to vacuumize the inner cavity of the heat pipe 600 only, so as to avoid the problem of more leakage points of global vacuumization, and the inner cavity of the heat pipe 600 has small volume and can realize higher vacuum degree; the quantitative accuracy of the filling quality of the heat pipe 600 is ensured by adopting a method of checking the quantitative filling liquid metal storage tank 400 and the electromagnetic flowmeter 401; finishing the filling of working medium in the vacuum operation box 100, and ensuring the purity of the liquid metal working medium; the inert gas storage tank 200 is adopted to replace air, so that the working medium is prevented from being oxidized.
Drawings
FIG. 1 is a schematic diagram of a high temperature heat pipe working medium filling device
Detailed Description
The invention will now be further described with reference to the examples, figures:
as shown in fig. 1, the liquid metal heat pipe packaging device of the present invention comprises a vacuum operation box 100, an inert gas storage tank 200, a vacuum pump unit 300, a liquid metal storage tank 400, a connection joint 500, a heat pipe 600, a gas inlet valve 201, a water oxygen detector 301, a helium mass spectrometer leak detector 302, a first valve 310, a second valve 320, a neck expansion cavity 311, a vacuum gauge 312, a sealing valve 313, an electromagnetic flowmeter 401 and a filling valve 402. The inert gas storage tank 200 is connected to the bottom of the vacuum operation box 100 through a gas inlet valve 201, an outlet of the vacuum pump unit 300 is connected with a water oxygen detector 301 and a helium mass spectrum leak detector 302, an inlet pipeline of the vacuum pump unit 300 penetrates into the upper side wall of the vacuum operation box 100 and then is divided into two paths, one path is communicated with the inside of the vacuum operation box 100 through a second valve 320, the other path is sequentially connected with a first valve 310, a neck expansion cavity 311 and a sealing valve 313 and then penetrates out of the bottom of the vacuum operation box 100 to be connected with an upper port of a connecting joint 500, and a vacuum gauge 312 is arranged on the neck expansion cavity 311; the liquid metal storage tank 400 passes through the electromagnetic flowmeter 401 and the filling valve 402 and passes out of the bottom of the vacuum operation box 100 to be connected with the upper port of the connecting joint 500, and the lower port of the connecting joint 500 is connected with the heat pipe 600.
As a preferred embodiment of the present invention, the inert gas storage tank 200 stores nitrogen, helium, neon, argon or xenon.
As a preferred embodiment of the present invention, the vacuum pump assembly 300 is a multi-stage assembly including one or more of an ion pump, a molecular pump, a diffusion pump, a jet pump, a Roots pump, a rotary vane pump, and a piston pump, and vacuum degree covering 10 5 ～10 -8 Pa magnitude; the multi-stage machine set can realize atmospheric pressure to 10 percent -8 The Pa magnitude vacuum degree can avoid the problem of limited vacuum pumping range of a single vacuum pump.
As a preferred embodiment of the present invention, the vacuum gauge 312 is a composite vacuum gauge, which is at least two of a Pirani vacuum gauge, a resistance vacuum gauge, a thermocouple vacuum gauge, a thermal radiation vacuum gauge, a thermal cathode ionization vacuum gauge, a cold cathode ionization vacuum gauge, and a viscous vacuum gauge, and the vacuum degree measurement cover 10 5 ～10 -8 Of the order of Pa. The combined vacuum gauge can realize the pressure from atmospheric pressure to 10 percent -8 The measurement of Pa magnitude vacuum degree avoids the defects of limitation of the measurement range and insufficient precision of a single vacuum gauge. As a preferred embodiment of the present invention, the liquid metal reservoirThe liquid metal in the storage tank 400 is lithium, sodium, potassium, rubidium, cesium or mercury, and the temperature maintained in the liquid metal storage tank 400 is such that the metal is in a liquid state, for example, when the liquid metal is lithium, the temperature is maintained in the liquid metal storage tank 400 at 200-300 ℃; if the liquid metal is sodium or potassium, the temperature in the liquid metal storage tank 400 is maintained at 150-250 ℃; if the liquid metal is rubidium or cesium, the temperature in the liquid metal storage tank 400 is maintained at 50-100 ℃; if the liquid metal is mercury, the temperature in the liquid metal storage tank 400 is maintained at 20-50 ℃.
As a preferred embodiment of the present invention, the sealing valve 313 and the filling valve 402 are liquid metal valves, and the operating temperature is 50 ℃ above the melting point of the liquid metal. The liquid metal valve is adopted, so that the defect that rubber substances in the traditional valve react with liquid metal is avoided, and the purity of the liquid metal and the reliability of the device are improved.
As a preferred embodiment of the present invention, the connection joint 500 is a vacuum joint, a high vacuum flange, a threaded joint or a movable joint is selected, and the gasket used for the connection joint 500 is a graphite gasket, an epoxy copper gasket or a steel skeleton graphite gasket, so that the defect of the rubber sealing ring and the liquid metal can be avoided, and reliable sealing connection is realized.
As a preferred embodiment of the present invention, the baking temperature of the heat pipe 600 is 250 ℃ +/-50 ℃ before filling, and the water vapor in the cavity of the heat pipe 600 is removed by baking, so that the oxidation of the liquid metal working medium is reduced. The filling vacuum degree of the heat pipe 600 is 10 -4 Pa, water oxygen content less than 10 -10 std cc/s, leakage rate lower than 10 -9 std cc/s provides a higher vacuum for the cavity of heat pipe 600, ensuring the packaging quality of heat pipe 600.
The working principle of the invention is as follows: opening the gas inlet valve 201 and the second valve 320, opening the vacuum pump unit 300 and the water-oxygen detector 301, performing water and oxygen removal operation on the interior of the vacuum operation box 100, and waiting for the water-oxygen detector 301 to display that the water-oxygen content is less than 10 -10 After std cc/s, the gas inlet valve 201 and the second valve 320 are closed, and a fixed amount of liquid metal working substance is charged into the liquid metal storage tank 400 through the vacuum operation tank 100 and is kept at 50 ℃ above the melting point of the liquid metal working substance. Heat is heatedAfter the pipe 600 is connected with the connecting joint 500, baking is carried out at the temperature of 250+/-50 ℃, the first valve 310 and the sealing valve 313 are opened to only vacuumize the inner cavity of the heat pipe 600, the helium mass spectrometer leak detector 302 is started, and the water oxygen detector 301 displays that the water oxygen content is less than 10 -10 std cc/s, helium mass spectrometer leak detector 302 shows a leak rate below 10 -9 After std cc/s, first valve 310 and sealing valve 313 are closed. And opening the packaging valve 402, and closing the packaging valve 402 after the indication of the electromagnetic flowmeter 401 is consistent with the quality of the liquid metal working medium. After the heat pipe 600 is cooled to room temperature, the first valve 310 and the sealing valve 313 are opened, and the vacuum gauge count is less than 10 -4 After Pa, sealing valve 313 is closed, and the liquid filling pipe of heat pipe 600 is thermally pinched off, thus completing the package of heat pipe 600.
Claims (7)
1. The utility model provides a liquid metal heat pipe packaging hardware which characterized in that: the device comprises a vacuum operation box (100), an inert gas storage tank (200), a vacuum pump unit (300), a liquid metal storage tank (400), a connecting joint (500), a heat pipe (600), a gas inlet valve (201), a water oxygen detector (301), a helium mass spectrum leak detector (302), a first valve (310), a second valve (320), a neck expansion cavity (311), a vacuum gauge (312), a sealing valve (313), an electromagnetic flowmeter (401) and a packaging valve (402); the inert gas storage tank (200) is connected to the bottom of the vacuum operation box (100) through a gas inlet valve (201), an outlet of the vacuum pump unit (300) is connected with the water oxygen detector (301) and the helium mass spectrum leak detector (302), an inlet pipeline of the vacuum pump unit (300) penetrates into the upper side wall of the vacuum operation box (100) and then is divided into two paths, one path is communicated with the inside of the vacuum operation box (100) through a second valve (320), the other path is sequentially connected with a first valve (310), a neck expansion cavity (311) and a sealing valve (313) and then penetrates out of the upper port of the bottom connection joint (500) of the vacuum operation box (100), and a vacuum gauge (312) is arranged on the neck expansion cavity (311); the liquid metal storage tank (400) passes through the electromagnetic flowmeter (401) and the packaging valve (402) to penetrate out of the bottom of the vacuum operation box (100) to be connected with the upper port of the connecting joint (500), and the lower port of the connecting joint (500) is connected with the heat pipe (600);
the vacuum gauge (312) is a composite vacuum gauge, which is a Pirani vacuum gauge, a resistance vacuum gauge and a thermocouple vacuum gaugeAt least two of a gauge, a thermal radiation gauge, a thermal cathode ionization gauge, a cold cathode ionization gauge, a viscous vacuum gauge, and a vacuum degree measurement cover 10 5 ～10 -8 Pa magnitude;
the baking temperature of the heat pipe (600) is 250+/-50 ℃ before filling, and the filling vacuum degree of the heat pipe (600) is 10 -4 Pa, water oxygen content less than 10 -10 std cc/s, leakage rate lower than 10 -9 std cc/s；
According to the working method of the liquid metal heat pipe packaging device, a gas inlet valve (201) and a second valve (320) are opened, a vacuum pump unit (300) and a water-oxygen detector (301) are opened, water and oxygen removal operation is carried out on the inside of a vacuum operation box (100), and the water-oxygen detector (301) displays that the water-oxygen content is less than 10 -10 After std cc/s, closing the gas inlet valve (201) and the second valve (320), filling quantitative liquid metal working medium into the liquid metal storage tank (400) through the vacuum operation box (100), and preserving heat to 50 ℃ above the melting point of the liquid metal working medium; after the heat pipe (600) is connected with the connecting joint (500), baking is carried out at the temperature of 250+/-50 ℃, the first valve (310) and the sealing valve (313) are opened, only the inner cavity of the heat pipe (600) is vacuumized, the helium mass spectrometer leak detector (302) is started, and the water-oxygen detector (301) displays that the water-oxygen content is less than 10 -10 std cc/s, helium mass spectrometer leak detector (302) shows a leak rate below 10 -9 After std cc/s, closing the first valve (310) and the sealing valve (313); opening the packaging valve (402), and closing the packaging valve (402) after the indication number of the electromagnetic flowmeter (401) is consistent with the mass of the liquid metal working medium; after the heat pipe (600) is cooled to room temperature, the first valve (310) and the sealing valve (313) are opened, and the vacuum gauge indication number is lower than 10 -4 And after Pa, closing the sealing valve (313), and performing thermal pinch-off on the liquid filling pipe of the heat pipe (600) to finish packaging of the heat pipe (600).
2. A liquid metal heat pipe packaging apparatus as defined in claim 1, wherein: the storage gas in the inert gas storage tank (200) is nitrogen, helium, neon, argon or xenon.
3. A liquid metal heat according to claim 1Tube packaging device, its characterized in that: the vacuum pump unit (300) is a multi-stage unit and comprises one or more of an ion pump, a molecular pump, a diffusion pump, a jet pump, a Roots pump, a rotary vane pump and a piston pump, and the vacuum degree is covered by 10 5 ～10 -8 Of the order of Pa.
4. A liquid metal heat pipe packaging apparatus as defined in claim 1, wherein: the liquid metal in the liquid metal storage tank (400) is lithium, sodium, potassium, rubidium, cesium or mercury, and the temperature maintained in the liquid metal storage tank (400) is such that the metal is liquid.
5. A liquid metal heat pipe packaging apparatus as defined in claim 1, wherein: the sealing valve (313) and the packaging valve (402) are liquid metal valves, and the working temperature is 50 ℃ above the melting point of the liquid metal.
6. A liquid metal heat pipe packaging apparatus as defined in claim 1, wherein: the connecting joint (500) is a vacuum joint, a high-vacuum flange, a threaded joint or a movable joint is selected, and a gasket used for the connecting joint (500) is a graphite gasket, an epoxy copper gasket or a steel skeleton graphite gasket.
7. A liquid metal heat pipe packaging apparatus as defined in claim 1, wherein: the inner diameter of the heat pipe (600) is less than or equal to 50mm, and the length is less than or equal to 2m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210015055.4A CN114396817B (en) | 2022-01-07 | 2022-01-07 | Liquid metal heat pipe packaging device and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210015055.4A CN114396817B (en) | 2022-01-07 | 2022-01-07 | Liquid metal heat pipe packaging device and method |
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| CN114396817A CN114396817A (en) | 2022-04-26 |
| CN114396817B true CN114396817B (en) | 2023-08-15 |
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| CN202210015055.4A Active CN114396817B (en) | 2022-01-07 | 2022-01-07 | Liquid metal heat pipe packaging device and method |
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| CN114719642B (en) * | 2022-05-20 | 2023-07-04 | 西安交通大学 | High-temperature sodium heat pipe filling device and method |
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| CN110243212B (en) * | 2019-05-31 | 2020-05-15 | 西安交通大学 | High-temperature alkali metal heat pipe hot-state filling loop system and method |
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| CN201634406U (en) * | 2009-12-23 | 2010-11-17 | 四川盛阳太阳能应用技术有限公司 | Device for leading working medium to be placed in split type heat pipe solar flat plate collector |
| CN102331204A (en) * | 2011-09-07 | 2012-01-25 | 济南大学 | Integrated equipment for preparing water-based nano-fluid and filling heat pipe |
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| CN114396817A (en) | 2022-04-26 |
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