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, rapid heating effect

Inactive Publication Date: 2009-12-16
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology uses an electric magnetic induction (EMI) heater to warm up the transition metals during their fusion process. It allows for quick adjustment of temperatures while also preventing damage from acids and bases used in traditional methods like immersion cool down techniques. Overall, this new method provides improved efficiency and quality compared to existing processes.

Problems solved by technology

Technological Problem: Current Solar Collectors Tubular Glass Heat Collection Tile (TGH) Connecters have issues with their ability to maintain strong connections when subjected to repeated temperatures over prolong periods without losing effectiveness. Additionally, current methods involve either one-side flat seals or two-pass curved seals, each having its own drawbacks including weakening resistance against bending stresses caused during installation.

Method used

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

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Embodiment 1

[0035] Such as figure 2 As 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 tube 5 is a straight tube, using 4J33 iron-nickel-cobalt alloy, and the wall thickness D is 0.3 mm. 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 the air, the temperature is 1050 ℃, and the time is 1 minute ; Then the lower end of the glass tube 2 is in positive contact with the upper end of the transition metal tube 5, and the transition metal tube is heated continuously, and the glass tube 2 is heated by the transition metal tube 5; after the contact part of the lower end of the glass tube 2 softens or melts, apply Slowly insert the transition metal tube 5 into the wall of the glass tube 2 with appropriate pressure, and insert the transition m...

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 and a time of 3 minutes ; Then the lower end of the glass tube 2 is in positive contact with the upper end of the transition metal tube 5, and the high-frequency electromagnetic induction heating device is used to continue heating the transition metal tube, and the lower end of the glass tube 2 is heated by the transition metal tube 5 until the lower end of the glass tube 2 After the contact part is softened or melted, apply appropriate pre...

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 and adopts a 4J44 iron-nickel-cobalt alloy with a wall thickness D of 0.8 mm. 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 the air, the temperature is 800 ℃, and the time is 15 minutes ; Then the lower end of the glass tube 2 is in positive contact with the upper end of the transition metal tube 5, and the high-frequency electromagnetic induction heating device is used 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, apply appropriate pressure to slowly insert the transition metal tube 5 into the wall...

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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 the fusing 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

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Claims

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Application Information

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Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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