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Thermal fusing sealing process of metal-glass solar heat-collecting tube

A technology of vacuum heat collecting tubes and solar energy, applied in the direction of solar heat collectors, fixed bases/supports of solar heat collectors, solar thermal energy, etc., can solve the problems of temperature limitation and low melting point, and achieve fusion sealing strength and tensile strength Good strength, simplified process, and reduced irregularity of hot-melt cover

Inactive Publication Date: 2011-06-22
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Another way of connecting glass and metal is heat sealing. The patent CN1262248A proposes a glass and metal heat sealing process, which belongs to the solid state welding technology of materials. Usually, solid solder with a low melting point such as lead or aluminum is placed on the metal end cap. Between the glass tube flange and the glass tube flange, when the solid solder is heated to soften, the cylinder is used to quickly apply impact pressure to the metal end cap, and then the interdiffusion between atoms occurs to realize the connection between the glass and the metal and meet the sealing requirements. It is also a single-sided flat Sealing, but this method is limited by the use of temperature due to the use of solder with a low melting point

Method used

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  • Thermal fusing sealing process of metal-glass solar heat-collecting tube
  • Thermal fusing sealing process of metal-glass solar heat-collecting tube
  • Thermal fusing sealing process of metal-glass solar heat-collecting tube

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Effect test

Embodiment 1

[0035] Such as figure 2As shown, the diameter of the glass tube 2 in this embodiment is 60 mm, the wall thickness is 2 mm, and the length is 1000 mm. The transition metal pipe 5 is a straight pipe made of 4J33 iron-nickel-cobalt alloy, and the wall thickness D is 0.3mm. First place the transition metal tube 5 under the glass tube 2 and align it coaxially; use high-frequency electromagnetic induction heating equipment to perform pre-oxidation treatment on the fusion seal of the transition metal tube 5 in air at a temperature of 1050°C for 1 minute Then the glass tube 2 lower end face is in positive contact with the transition metal tube 5 upper end face, and the transition metal tube is continued to be heated, and the glass tube 2 is heated through the transition metal tube 5; after the glass tube 2 lower end contact part is softened or melted, apply Slowly insert the transition metal tube 5 into the wall of the glass tube 2 with an appropriate pressure, and the depth L of th...

Embodiment 2

[0037] Such as image 3 As shown, the outer diameter of the glass tube 2 in this embodiment is 120 mm, the wall thickness is 3 mm, and the length is 250 mm. The transition metal tube 5 has an L-shaped outer flange 6 structure, the material is 4J29 iron-nickel-cobalt alloy, and the wall thickness is 1mm. First place the transition metal tube 5 under the glass tube 2 and align it coaxially; use high-frequency electromagnetic induction heating equipment to pre-oxidize the fusion seal of the transition metal tube 5 in air at a temperature of 950°C for 3 minutes Then the glass tube 2 lower end face is in direct contact with the transition metal tube 5 upper end, utilizes high-frequency electromagnetic induction heating equipment to continue heating the transition metal tube, and the glass tube 2 lower end is heated by the transition metal tube 5, and the glass tube 2 lower end is heated. After the contact part is softened or melted, apply appropriate pressure to slowly insert the ...

Embodiment 3

[0039] Such as Figure 4 As shown, the diameter of the glass tube 2 in this embodiment is 104 mm, the wall thickness is 2.8 mm, and the length is 2000 mm. The transition metal tube 5 has an outer annular step 7, which is made of 4J44 iron-nickel-cobalt alloy, and the wall thickness D is 0.8mm. First place the transition metal tube 5 under the glass tube 2 and align it coaxially; use high-frequency electromagnetic induction heating equipment to pre-oxidize the fusion seal of the transition metal tube 5 in air at a temperature of 800°C for 15 minutes ; Then the glass tube 2 lower end face is in direct contact with the transition metal tube 5 upper end face, utilizes the high-frequency electromagnetic induction heating equipment to continue heating the transition metal tube, and the glass tube 2 is heated by the transition metal tube 5; After the contact part is softened or melted, an appropriate pressure is applied to slowly insert the transition metal tube 5 into the wall of t...

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Abstract

The invention relates to a thermal fusing sealing process of a metal-glass solar heat-collecting tube. The process adopting a vertical double-sided thermal fusing sealing mode comprises the following steps: arranging a transition metal tube (5) below a glass tube (2) to be coaxially aligned; utilizing high-frequency electromagnetic induction heating equipment for the preoxidation treatment of thefusing sealing part of the transition metal tube (5) in air; then, aligning and contacting the lower end surface of the glass tube (2) and the upper end surface of the transition metal tube (5) and continuously heating; slowly inserting the transition metal tube (5) into the glass wall to form double-sided fusing sealing after the lower-end contact part of the glass tube (2) is softened or melted; then, cooling; and immediately annealing after glass is solidified so as to finish the thermal fusing sealing of glass and metal. Compared with the prior art, the invention has simple process, low labor intensity, little energy consumption and easily controlled precision and can remarkably improve the fusing sealing quality and the strength of the glass and the metal.

Description

technical field [0001] The invention relates to a heat-melting sealing process of a metal-glass type vacuum heat collecting tube for solar linear concentration and heat absorption. Background technique [0002] Metal-glass vacuum heat collector tubes for solar linear concentration and heat absorption are generally used in trough solar thermal power generation systems. The incident light is linearly focused on the heat collector tube through a parabolic reflector that can track the sun, and the heat collector tube absorbs sunlight and heats it. The working medium in the tube generates high-temperature steam. The heat collecting tube consists of a stainless steel inner tube with a radiation-absorbing coating and a surrounding glass outer tube. Since the glass tube and the stainless steel inner tube are made of different materials, a glass tube and a transition metal tube are required between the glass tube and the stainless steel inner tube. Heat sealing forms an airtight con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C27/02F24J2/05F24S10/40
CPCF24J2002/4681F24J2/055Y02E10/44F24S10/45F24S2025/6013
Inventor 雷东强王志峰
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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