Glass-metal heat sealing material and method of heat-pipe evacuated solar collector tube

A technology of vacuum heat collecting tube and sealing material, which is applied in the field of heat pipe type vacuum heat collecting tube glass-metal hot-pressing sealing material, which can solve the problems of difficult atomic-level sealing of solder metal and poor matching of Fe atoms, and achieve extension Improve performance, prolong service life and reduce air leakage rate

Inactive Publication Date: 2013-08-28
西藏中科阳光新能源科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the main component of the sealed iron-nickel expansion alloy end cap is Fe, the outer electrons of Fe atoms are 4S 2 Orbital electrons, and the outer electron structures of these metals used in solders are not well matched with Fe atoms. For example, the outer electrons of Pb atoms are 6

Method used

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  • Glass-metal heat sealing material and method of heat-pipe evacuated solar collector tube

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0020] Example 1

[0021] When the composition of the welding wire is Ni, the heat pipe vacuum collector tube glass-metal heat pressure sealing method is as follows:

[0022] Fire one end of the Φ100mm glass tube into a glass flange 3. The flange end surface and the surface of the iron-nickel expansion alloy end cover 1 are cleaned and degreasing respectively. A ring-shaped welding wire 2 with a diameter of 0.1mm is inserted in the middle, and the sealing part is heated to 700 ℃, the sealing temperature is 0.6 times the melting point of the welding wire, 70kg / cm is applied to the end face 2 The impact pressure, the impact time is 0.5s, and the air leakage rate of the obtained sealing surface can be less than 1×10 -11 Torr.L / sec, meet the sealing requirements.

[0023] When the composition of the welding wire is any one of the elemental metals Mg, Be, V, and Co, a good sealing effect can also be obtained by pressing and sealing according to the above-mentioned process.

Example Embodiment

[0024] Example 2:

[0025] When the composition of the welding wire is an alloy of Ni and Si added to the V base metal, the mass fraction of nickel in the metal alloy is 1%, and the mass fraction of silicon is 1%, and the heat pipe type vacuum heat collector tube glass-metal hot press The sealing method is as follows:

[0026] Firing one end of the Φ100mm glass tube into a glass flange 3. The flange end surface and the surface of the iron-nickel expansion alloy end cover 1 are cleaned and degreasing respectively. A ring-shaped welding wire 2 with a diameter of 10mm is inserted in the middle, and the sealing part is heated to 650℃ , The sealing temperature is 0.7 times the melting point of the welding wire, 200kg / cm is applied to the end face 2 The impact pressure, the impact time is 1min, and the air leakage rate of the obtained sealing surface can be less than 1×10 -11 Torr.L / sec, meet the sealing requirements.

[0027] The base metal V in the welding wire can be replaced with one ...

Example Embodiment

[0028] Example 3:

[0029] When the composition of the welding wire is an alloy of Ni and Si added to the V base metal, the mass fraction of nickel in the metal alloy is 15%, and the mass fraction of silicon is 15%. The heat pipe vacuum heat collector tube glass-metal hot press The sealing method is as follows:

[0030] Firing one end of the Φ100mm glass tube into a glass flange 3, the flange end surface and the surface of the iron-nickel expansion alloy end cap 1 are cleaned and degreasing respectively, and a ring-shaped welding wire 2 with a diameter of 15mm is inserted in the middle, and the sealing part is heated to 800°C , The sealing temperature is 0.8 times the melting point of the welding wire, 300kg / cm is applied to the end face 2 The impact pressure is 1.5min, and the air leakage rate of the obtained sealing surface can be less than 1×10 -11 Torr.L / sec, meet the sealing requirements.

[0031] The base metal V in the welding wire can be replaced with one of Mg, Be, and Co, ...

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PUM

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Abstract

The invention discloses glass-metal heat sealing material and method of a heat-pipe evacuated solar collector tube. One end of a glass tube is sintered into a glass flange; the end face of the flange and the surface of a Fe-Ni expansion alloy end cover are respectively cleaned and deoiled; an annular welding wire prepared from the glass-metal heat sealing material is clamped in the middle, wherein the sealing temperature is 0.6-0.9 times of the melting point of the welding wire, the exerted impact pressure is 70-500kg/cm<2>, and the time is 0.5 seconds to 2 minutes; the glass-metal heat sealing material is selected from any one of metal substances or metal alloy of Mg, Be, V, Co and Ni,the metal alloy contains nickel and silicon, the mass fraction of the nickel in the metal alloy is 1-30%, the mass fraction of the silicon is 1-30%, and base metal is selected from any one of Mg, Be, V and Co. The corrosion resistance, the welding temperature, the fatigue strength and the malleability of the welding line disclosed by the invention are improved; the welding wire is more tightly combined with glass and metal; the air leak rate is reduced; and the service life is prolonged.

Description

Technical field: [0001] The invention relates to the technical field of glass-metal thermocompression sealing, in particular to a glass-metal thermocompression sealing material and method for a heat pipe type vacuum heat collecting tube. Background technique: [0002] Solar water heater is the most typical technology in the field of low temperature application of solar energy. By the end of 2010, the number of water heaters in the world reached 187.5 million m 2 , of which China has 150 million m 2 , accounting for 80% of the world, is the country that utilizes the most solar thermal energy in the world, and its annual output reached 31 million m in 2008 and 2009 respectively 2 and 42 million m 2 , an increase of 32.5% and 35.5% respectively over the previous year. [0003] All-glass vacuum tube water heaters are the mainstream of solar water heaters in my country, accounting for more than 90% of the market share. With the development of the global trend of building int...

Claims

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Application Information

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IPC IPC(8): C03C27/00
Inventor 史继富徐刚王雷雷熊斌
Owner 西藏中科阳光新能源科技股份有限公司
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