CN114370782B - Enhanced loop heat pipe heat transfer system adopting field installation process - Google Patents
Enhanced loop heat pipe heat transfer system adopting field installation process Download PDFInfo
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- CN114370782B CN114370782B CN202111517170.3A CN202111517170A CN114370782B CN 114370782 B CN114370782 B CN 114370782B CN 202111517170 A CN202111517170 A CN 202111517170A CN 114370782 B CN114370782 B CN 114370782B
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- heat
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- condenser
- capillary pump
- heat transfer
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- 238000011900 installation process Methods 0.000 title claims abstract description 8
- 238000005219 brazing Methods 0.000 claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract description 21
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 238000001816 cooling Methods 0.000 claims abstract 2
- 238000003466 welding Methods 0.000 claims description 50
- 239000000945 filler Substances 0.000 claims description 17
- 239000002184 metal Substances 0.000 claims description 17
- 229910052751 metal Inorganic materials 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 13
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 12
- 229910000679 solder Inorganic materials 0.000 claims description 12
- 239000000758 substrate Substances 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 claims description 9
- 238000007747 plating Methods 0.000 claims description 9
- 238000005476 soldering Methods 0.000 claims description 8
- LQBJWKCYZGMFEV-UHFFFAOYSA-N lead tin Chemical group [Sn].[Pb] LQBJWKCYZGMFEV-UHFFFAOYSA-N 0.000 claims description 7
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 claims description 6
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 claims description 6
- 230000004907 flux Effects 0.000 claims description 6
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- 238000004381 surface treatment Methods 0.000 claims description 6
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 229910052797 bismuth Inorganic materials 0.000 claims description 4
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 229910052709 silver Inorganic materials 0.000 claims description 3
- 239000004332 silver Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 2
- 239000004744 fabric Substances 0.000 abstract 1
- 239000000306 component Substances 0.000 description 8
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000005429 filling process Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
-
- 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
- F28D15/04—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 tubes having a capillary structure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/008—Soldering within a furnace
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2029—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant with phase change in electronic enclosures
- H05K7/20336—Heat pipes, e.g. wicks or capillary pumps
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
- H05K7/20936—Liquid coolant with phase change
Abstract
The invention discloses an enhanced loop heat pipe heat transfer system adopting a field installation process. The system is characterized in that the heat transfer components are independently welded and installed through a brazing technology and then are connected into a whole, so that the problem of limited heat transfer capacity caused by integral forming and unified installation of the loop heat pipe system is solved, the restriction of limited contact area of the loop heat pipe is eliminated, and the heat transfer capacity of the system is improved. The heat collecting device comprises five parts assembled on site, namely a heat collecting part, a capillary pump, a condenser, a pipeline and a working medium, wherein the heat collecting part is arranged on a heating surface and is used for collecting heat dispersed on the cooling surface; the capillary pump cloth is used for driving the operation of the loop heat pipe system and is fixed at the heat collecting end in a low-temperature brazing mode; the condenser is a radiating component and is fixed on a radiating surface by adopting high-temperature brazing; the pipeline acts on the capillary pump and the condenser to form a closed loop; the working medium is used for realizing heat transfer, and an indirect filling method is adopted during assembly.
Description
Technical Field
The invention belongs to the technical field of spacecraft thermal control design, and particularly relates to an enhanced loop heat pipe heat transfer system adopting a field installation process.
Technical Field
The development of aerospace technology has the problem that the integration level of equipment is higher and higher, and the heat consumption of the equipment is from the previous 10W to hundred W, so that the heat dissipation of the equipment becomes difficult. Particularly, the heat dissipation of a plurality of scattered high-power devices becomes a constraint factor of configuration layout.
In the configuration layout of the spacecraft, the equipment layout is compact in general, the high-power heating equipment is far away from an effective radiating surface, and the high-power heating equipment are positioned in different directions of the spacecraft, so that the long-distance heat transmission characteristic on a three-dimensional space path is shown. The conventional heat transfer system, such as an externally attached heat pipe, a heat conducting cable and the like, has strong rigidity and short transmission distance, is widely applied to short-distance heat transmission on a plane path, and is difficult to directly and effectively connect heat generating equipment and a radiating surface into a whole, and layout implementation is difficult. The loop heat pipe is flexible in layout, the heat transfer path is as long as tens of meters, and the self heat transfer capacity is strong. In the specific application, the loop heat pipe system is uniformly installed in a spacecraft in a screw mode after the capillary pump, the condenser, the pipeline and the working medium are integrated. However, the capillary pump has a limited mounting area, and the interface heat exchange coefficient between the capillary pump and the heating device is 1000W/(m) 2 K) magnitude, large interface temperature difference and poor heat transfer effect, and a plurality of loops of heat pipes are needed to be configured for heat transfer. The brazing technology improves the heat exchange coefficient between the mounting surfaces in order of magnitude, and can realize high heat transfer in a small area. However, the dimensions of the loop heat pipe system are large, and the tolerance temperatures of the various components are not uniform, so that brazing cannot be used integrally on the loop heat pipe system. Therefore, there is a great need to develop a braze-based enhanced heat transfer system for loop heat pipes, wherein a single system can achieve the heat transfer capability of multiple sets of conventional loop heat pipes.
Disclosure of Invention
In view of this, the present invention provides an enhanced loop heat pipe heat transfer system employing a field installation process. The system is characterized in that the heat transfer components are independently welded and installed through a brazing technology and then are connected into a whole, so that the problem of limited heat transfer capacity caused by integral forming and unified installation of the loop heat pipe system is solved, the restriction of limited contact area of the loop heat pipe is eliminated, and the heat transfer capacity of the system is improved. The specific technical scheme is as follows:
the invention comprises five parts assembled on site, namely a heat collecting part, a capillary pump, a condenser, a pipeline and working medium. The specific functions of the components are as follows:
comprises five parts, namely a heat collecting part, a capillary pump, a condenser, a pipeline and a working medium, wherein,
the heat collecting component is arranged on a heating surface and is used for collecting heat dispersed on the heating surface and collecting the heat at the heat collecting end;
the capillary pump is arranged at the heat collecting end and used for driving the operation of the loop heat pipe system through internal capillary force, and the capillary pump is fixed at the heat collecting end in a brazing mode;
further, adopting bismuth-based solder and rosin soldering flux;
further, the specific brazing process is as follows:
a) Surface treatment is adopted on the welding surface of the capillary pump and the collecting end of the heat pipe, and nickel plating and silver plating processes are carried out to form a welded substrate;
b) The welding substrates of the capillary pump and the heat collecting end are coated with brazing filler metal;
c) The capillary pump and the heat collecting end are used for installing the welding surfaces together and pressurizing the welding surfaces to form a welding body;
d) Placing the whole welding body into a heating furnace with the melting point higher than that of the brazing filler metal and lower than 100 ℃ and keeping the temperature for 6 hours, and then closing the furnace temperature until the welding body is naturally cooled;
e) The welded body was inspected for appearance and size and the brazing rate was inspected by X-ray.
The condenser is a heat radiating component and is used for radiating heat and is fixed on a heat radiating surface in a brazing mode;
furthermore, tin-lead solder is selected as the solder, and rosin soldering flux is selected as the solder.
Further, the specific brazing process is as follows:
a) Surface treatment is adopted on the welding surface of the condenser and the radiating surface, and a nickel plating procedure is carried out to form a welded substrate;
b) Tin-lead solder is coated on the welding substrates of the condenser and the radiating surface;
c) The condenser and the radiating surface are used for installing the welding surfaces together and pressurizing the welding surfaces to form a welding body;
d) Placing the welding body into a heating furnace at 220 ℃ and keeping the temperature for 6 hours, and then closing the furnace temperature until the welding body is naturally cooled;
e) The welded body was inspected for appearance and size and the brazing rate was inspected by X-ray.
The pipeline is used as a connecting component and is used for connecting the capillary pump and the condenser to form a closed loop, and the interior of the pipeline is used for bearing working media;
the working medium is a heat transmission carrier, and heat transfer is realized through phase change conversion between gas and liquid states of the working medium.
Because the filling platform is large in size and cannot be carried to the site, the conventional direct filling method cannot be implemented, and therefore a movable filling tank is required to be adopted, and an indirect filling method is adopted:
further, the working medium filling is carried out at the pipeline filling port of the capillary pump, and the actual working medium filling quantity in the pipeline is obtained by measuring the weight of the filling tank twice.
Advantageous effects
Adopting a brazing process, and enabling the interface heat exchange coefficient between the capillary pump and the heat pipe and between the condenser and the heat pipe to be from 1000W/(m) 2 K) up to 10000W/(m) 2 K) above, greatly improves the heat radiation performance of the heat transfer system, effectively reduces the contact surface size and the use quantity of the capillary pump and the condenser, and has obvious weight reduction effect. The heat transfer performance of the single-set system can reach 300W, which is equivalent to the performance of 3 sets of traditional screw mounting type heat transfer systems.
Drawings
FIG. 1 is a diagram of an enhanced heat transfer system based on loop heat pipes
FIG. 2 is a schematic diagram of a capillary pump soldering assembly;
FIG. 3 is a schematic view of a condenser weld assembly;
FIG. 4 is a schematic diagram of the filling;
FIG. 5 is a flow chart of a capillary pump brazing process;
FIG. 6 is a flow chart of a working medium filling process.
Detailed Description
The invention will now be described in detail with reference to the accompanying drawings and examples.
The enhanced system based on the loop heat pipe comprises a heat collecting component, a capillary pump, a condenser, a pipeline and a working medium, as shown in figure 1.
1) A heat collecting part: the scattered heat is collected by means of common heat transfer tools such as heat pipes and the like and collected at a certain place (heat collection end);
2) Capillary pump: the core component of the heat transfer system drives the whole heat transfer system to operate through internal capillary force and is generally arranged in a region with high temperature;
3) And (3) a condenser: the heat dissipation part of the heat transfer system dissipates heat through a condenser and is generally arranged in a low-temperature area;
4) And (3) a pipeline: as a connecting part, the capillary pump and the condenser are connected to form a closed loop, and the inside of the closed loop bears working medium. According to the filling amount of working medium, selecting a stainless steel pipe with the diameter phi of 3-5 mm;
5) Working medium: the heat transmission carrier of the heat transmission system realizes heat transmission through phase change conversion of working medium between gas state and liquid state, can be selected according to the use temperature range and pressure, and can select ammonia gas generally in the range of-10 to 50 ℃ which is commonly used for spacecrafts.
The invention adopts a brazing process and realizes solid connection between two welding surfaces through high-temperature melting. The solder can be divided into a low temperature region (80 ℃) solder and a high temperature region (220 ℃) solder according to the welding temperature;
three heating devices are arranged on a +X side cabin board A of the spacecraft, a radiating surface is arranged on a cabin board B on the-X side of the spacecraft, and a heat transfer system is needed to transfer heat of the heating devices from the +X side to the-X side of the spacecraft, wherein the transmission distance is 6m.
The device is required to be installed on the plate A and the plate B on site by utilizing the device to radiate heat of the heating equipment, and then the heating equipment is installed on the +X side cabin plate A of the spacecraft, and the device is concretely implemented as follows:
1) The heat collecting component is an orthogonal heat pipe, 2X-direction heat pipes and 2Z-direction heat pipes are embedded in the honeycomb plate (plate A) in advance, and the orthogonal heat pipes are used for leveling the temperature difference of equipment on the honeycomb plate and are used for realizing heat collection; in a particular heat pipe arrangement, the X-direction heat pipe is required to traverse the mounting surface area of the heat generating device, and the other side is in contact with the Z-direction heat pipe.
2) When the plate A is produced, the heat collecting end needs to be exposed; the capillary pump and the heat collecting end are welded by adopting a brazing process (namely the capillary pump and the plate A are welded), and the brazing filler metal is bismuth-based brazing filler metal (Sn-Pb-Bi-Cd) due to the limitation of the use safety of products, wherein the brazing filler metal is low-melting-point alloy brazing filler metal, the melting point of the brazing filler metal is 70 ℃, rosin soldering flux is selected, the welding temperature is 80 ℃, and the soldering rate is not lower than 80%; the specific welding process is as follows:
a) Surface treatment is adopted on the welding surface of the capillary pump and the collecting end of the heat pipe, and nickel plating and silver plating processes are carried out to form a welded substrate;
b) The welding substrate of the capillary pump and the heat collecting end is coated with bismuth-based brazing filler metal at 80 ℃ with the coating thickness of 0.1mm;
c) The capillary pump and the heat collecting end are used for installing the welding surfaces together and pressurizing the welding surfaces in the form of screws and the like to form a welding body;
d) Placing the whole capillary pump welding assembly into a heating furnace at 80 ℃ and keeping the temperature for 6 hours, and then closing the furnace temperature until the capillary pump welding assembly is naturally cooled;
e) The appearance and size of the capillary pump welded assembly were inspected and the brazing rate was inspected by X-ray.
The interface heat exchange coefficient is from 1000W/(m) through brazing 2 K) up to 10000W/(m) 2 K) above, the contact area is greatly reduced, and the weight and the number of sets of the capillary pump can be further reduced;
3) The condenser is brazed with the heat dissipation plate (plate B), tin-lead brazing filler metal (Sn 63-Pb 37) can be selected as the brazing filler metal according to the safety limit of products, the brazing filler metal is tin-lead eutectic brazing filler metal, the melting point of the brazing filler metal is 183 ℃, rosin soldering flux is selected, the welding temperature is 220 ℃, and the brazing rate is not lower than 80%;
the specific welding process is as follows:
a) Surface treatment is adopted on the welding surface of the condenser and the radiating surface, and a nickel plating procedure is carried out to form a welded substrate;
b) The welding substrates of the condenser and the radiating surface are coated with 220 ℃ tin-lead solder, and the coating thickness is 0.1mm;
c) The condenser and the radiating surface are used for installing the welding surfaces together and pressurizing the welding surfaces in the form of screws and the like to form a welding body;
d) Placing the whole condenser welding assembly into a heating furnace at 220 ℃ and keeping the temperature for 6 hours, and then closing the furnace temperature until the condenser welding assembly is naturally cooled;
e) The appearance and size of the condenser welded assembly were inspected, and the brazing rate was inspected by X-ray.
The condenser is connected with the radiating surface by brazing, so that the interface heat exchange coefficient between the condenser and the radiating surface is improved, the length of the condenser can be reduced, and the weight or the number of the condensers is further reduced;
4) Connecting the capillary pump and the condenser into a loop by adopting a stainless steel pipe with the diameter phi 3mm, wherein an outlet of the capillary pump is connected with an inlet of the condenser, and an outlet of the condenser is connected with an inlet of the capillary pump to finally form a closed loop;
5) According to the working temperature range of the heat transfer system, ammonia gas is selected as working medium, and a certain amount of working medium is filled in the loop, so that the system can normally operate in the high-low temperature range.
The capillary pump and the condenser are respectively arranged on two cabin boards with the span of 6m, and the working medium filling needs to adopt an indirect filling method, and the specific filling process is as follows:
a) The filling port of the capillary pump is opened and is connected with an external filling pipe system;
b) The external filling pipeline system adopts a vacuum pump to vacuumize, and air and impurities in the pipeline systems of the capillary pump and the condenser are completely pumped out;
c) Filling about 110g of high-purity ammonia working medium into the filling tank, and weighing and recording the weight M of the whole filling tank 1 ；
d) The filling tank is connected with an external filling pipe system, and the working medium in the filling tank is filled into the pipelines of the capillary pump and the condenser in a heating mode;
e) After the working medium is filled, closing a capillary pump filling port, removing the filling tank, weighing again, and recording the weight M of the filling tank 2 ；
f) The actual filling quantity of the working medium in the pipelines of the capillary pump and the condenser is M can be obtained through the weight difference of the two filling tanks 1 -M 2 。
Claims (3)
1. An enhanced loop heat pipe heat transfer system employing a field installation process, characterized by: the system is characterized in that the components are welded and installed on site by brazing technology, and then are connected into a whole to complete heat transfer, and the system comprises five parts which are assembled on site and are respectively a heat collecting component, a capillary pump, a condenser, a pipeline and a working medium,
the heat collecting component is arranged on the heating surface and is used for collecting heat dispersed on the cooling surface and collecting the heat at the heat collecting end;
the capillary pump is arranged at the heat collecting end and used for driving the operation of the loop heat pipe heat transfer system through internal capillary force, and the capillary pump is fixed at the heat collecting end in a brazing mode;
the condenser is a heat radiating component and is used for radiating heat and is fixed on a heat radiating surface in a brazing mode;
the pipeline is used as a connecting component and is used for connecting the capillary pump and the condenser to form a closed loop, and the interior of the pipeline is used for bearing working media;
the working medium is a heat transmission carrier, heat transfer is realized through phase change conversion between gas and liquid states of the working medium, and the working medium is filled in the field by adopting an indirect filling method;
the capillary pump welding brazing filler metal adopts bismuth-based brazing filler metal and rosin soldering flux;
the specific process of capillary pump brazing is as follows:
a) Surface treatment is adopted on the welding surface of the capillary pump and the heat collecting end, and nickel plating and silver plating processes are carried out to form a welded substrate;
b) The welding substrates of the capillary pump and the heat collecting end are coated with brazing filler metal;
c) The capillary pump and the heat collecting end are used for installing the welding surfaces together and pressurizing the welding surfaces to form a welding body;
d) Placing the whole welding body into a heating furnace with the melting point higher than that of the brazing filler metal and lower than 100 ℃ and keeping the temperature for 6 hours, and then closing the furnace temperature until the welding body is naturally cooled;
e) Checking appearance and size of the welded body and checking the brazing rate by X-ray;
and (3) filling working medium at a pipeline filling port of the capillary pump, and obtaining the actual filling quantity of the working medium in the pipeline by measuring the weight of the filling tank twice.
2. An enhanced loop heat pipe heat transfer system employing a field installation process as set forth in claim 1 wherein: further, the welding solder of the condenser is tin-lead solder, and rosin soldering flux is selected.
3. An enhanced loop heat pipe heat transfer system employing a field installation process as set forth in claim 2 wherein: further, the condenser brazing specific process is as follows:
a) Surface treatment is adopted on the welding surface of the condenser and the radiating surface, and a nickel plating procedure is carried out to form a welded substrate;
b) Tin-lead solder is coated on the welding substrates of the condenser and the radiating surface;
c) The condenser and the radiating surface are used for installing the welding surfaces together and pressurizing the welding surfaces to form a welding body;
d) Placing the welding body into a heating furnace at 220 ℃ and keeping the temperature for 6 hours, and then closing the furnace temperature until the welding body is naturally cooled;
e) The welded body was inspected for appearance and size and the brazing rate was inspected by X-ray.
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| CN202111517170.3A CN114370782B (en) | 2021-12-07 | 2021-12-07 | Enhanced loop heat pipe heat transfer system adopting field installation process |
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| CN114370782B true CN114370782B (en) | 2024-04-09 |
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| CN107144160A (en) * | 2017-04-19 | 2017-09-08 | 北京空间飞行器总体设计部 | A kind of 160K that works in is to the double loop deep cooling loop circuit heat pipe of 220K warm areas |
| CN210862316U (en) * | 2019-09-20 | 2020-06-26 | 山东兆瓦热能科技有限公司 | Heat transfer system |
| CN111397409A (en) * | 2020-03-02 | 2020-07-10 | 北京空间机电研究所 | Coupling phase-change material high-dispersion-ratio loop heat pipe device for spacecraft |
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| CN114370782A (en) | 2022-04-19 |
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