Solar Antifreeze Vacuum Heat Pipe and Its Manufacturing Technology by Heat Discharging Method
A vacuum heat pipe and manufacturing process technology, applied in solar thermal power generation, solar thermal devices, heating devices, etc., can solve problems such as use failure and performance defects of antifreeze heat pipes, achieve the effect of consolidating antifreeze performance and improving the qualified rate of finished products
Active Publication Date: 2015-10-28
南京艾普太阳能设备有限公司
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AI Technical Summary
Problems solved by technology
At the temperature of -20°C±2°C, the antifreeze heat pipe produced at this stage was tested for antifreeze, and it was found that the expansion phenomenon appeared after 3-4 cycles, indicating that the antifreeze heat pipe made of stainless steel sleeves at this stage has performance defects. Use in high latitude or low temperature areas is likely to fail
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment
[0020] 1. Use a shrinking machine to shrink the unwelded end of the copper tube, and the outer diameter of the tube after shrinking is 4-4.5mm.
[0021] 2. Put 5-5.5 ml CaCl 2 The solution is injected into the copper tube after shrinking the tube for use;
[0022] 3. The first step of exhaust: CaCl will be added 2 The copper tube of the solution is put into the exhaust furnace, and the mouth of the heat pipe is closed when heated to about 95°C. After that, the exhaust was carried out 3 times at 180 ℃, 190 ℃ and 200 ℃ respectively, and the total exhaust amount was controlled at 1.5 ± 0.5 ml. Finally, the nozzle was clamped with sealing pliers, and then sealed with carbon arc welding.
[0023] 4. Aging and saw marks: After a row of heat pipes are sent to an aging furnace (200-240°C) for heating for 36-48 hours, they are taken out and cooled. According to the length requirements of the heat pipe specifications, a ring is cut at a suitable place at the end of the heat pipe ( Ma...
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The invention relates to a solar antifreeze vacuum heat pipe and a process for manufacturing the same by the aid of a heat extraction method. The solar antifreeze vacuum heat pipe comprises a vacuum heat pipe body. A working medium in the vacuum heat pipe body is CaCl<2>. The process for manufacturing the solar antifreeze vacuum heat pipe by the aid of the heat extraction method includes an exhaust step. The exhaust step particularly includes exhausting gas in a copper pipe by the heat extraction method to acquire the antifreeze vacuum heat pipe. CaCl<2> solution is preliminarily filed in the copper pipe. The solar antifreeze vacuum heat pipe and the process have the advantages that the CaCl<2> is used as the working medium of the vacuum heat pipe, so that the vacuum heat pipe has an antifreeze property, and expansion or swelling of the manufactured heat pipe can be prevented at the temperatures of minus 20 DEG C+ / -2 DEG C as verified by antifreeze tests.
Description
technical field [0001] The invention relates to a solar antifreeze vacuum heat pipe and a manufacturing process thereof by a heat exhaust method, and belongs to the field of solar heat pipe manufacturing. Background technique [0002] Solar heat pipes are used all over the world, and many customers are located in high latitudes, which requires heat pipes to have excellent frost resistance. [0003] The antifreeze heat pipe made at this stage is to add copper powder and a stainless steel sleeve at the end of the heat pipe to prevent the heat pipe from expanding or even freezing at low temperature. Before the preparation and development of antifreeze heat pipes, ordinary freezers were used for testing and verification. Due to the limited volume of the freezers, the heat pipes could not be placed in the freezers. No swelling or cracking occurred in the freezer. At the temperature of -20℃±2℃, the antifreeze heat pipe made at the current stage was subjected to the antifreeze te...
Claims
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IPC IPC(8): F24J2/46
CPCY02E10/40
Inventor 张爱友
Owner 南京艾普太阳能设备有限公司