Tight connecting device of glass tube and metal tube

Abstract

The invention discloses a tight connecting device of a glass tube and a metal tube. The metal tube is sleeved inside the glass tube. The tight connecting device comprises a transition tube, a metal end cover, and a corrugated tube; the metal tube is sleeved outside the metal tube; one end of the transition tube is connected to the metal tube and the other end of the transition tube is provided with an outward edge and extends into the glass tube; the metal end cover is made of an expansion alloy material and sleeved on the transition tube; the peripheral edge is sealed on the end face of an opening of the glass tube in a hot pressing manner; the corrugated tube is sleeved on the transition tube at the inner side of the metal end cover; one end and the inner peripheral edge of the metal end cover are welded together, and the other end of the metal end cover is welded on the outward edge of the transition tube. The tight connecting device has the beneficial effects that assembling components are reduced; the production cost is reduced; the quantity of welded junctions is halved; the production technology difficulty is reduced; the yield is improved; and the heat collecting efficiency and the service life of a vacuum tube are effectively improved and prolonged.

Description

technical field [0001] The invention relates to a sealing connection device between a glass tube and a metal tube. Background technique [0002] At present, in the traditional glass-metal fusion sealing method, the structure of the sealing components is complicated, and the glass tube material and the metal sealing material are required to be strictly matched. As far as the Chinese market is concerned, it is difficult for these two materials to meet the requirements, and the sealing Metal is expensive. Another kind of straight-through solar collector tube with metal tube heat absorber, one end of the metal tube is welded with a corrugated tube outside the port of the glass tube. The corrugated tube can absorb the expansion and contraction of the metal tube to protect the glass tube. At the sealing joint with the metal tube, this type of corrugated tube dissipates heat quickly and has poor corrosion resistance. Its operating temperature is around 200°C, which is not suitable...

AI Technical Summary

Problems solved by technology

[0002] At present, in the traditional glass-metal fusion sealing method, the structure of the sealing components is complicated, and the glass tube material and the metal sealing material are required to be strictly matched. As far as the Chinese market is concerned, it is difficult for these two materials to meet the requirements, and the sealing metal is expensive

Another kind of straight-through solar collector tube with metal tube heat absorber, one end of the metal tube is welded with a corrugated tube outside the port of the glass tube. The corrugated tube can absorb the expansion and contraction of the metal tube to protect the glass tube. At the sealing joint with the metal tube, this type of corrugated tube dissipates heat quickly and has poor corrosion resistance. Its operating temperature is around 200°C, which is not suitable for the application of medium and high temperature solar energy

There is also a straight-through solar collector tube with a metal tube heat absorber. The corrugated tube is located inside the glass port, but there are additional transition components between the corrugated tube and the end cover, the corrugated tube and the transition tube. It increases the cost and doubles the number of welding joints. Because the bellows, metal end caps and transition components are thinner, the welding difficulty is increased, the welding yield is reduced, and the transition components complicate the production process, making the sealing component The total cost is greatly increased, and because of the thinner weldment and more welds, the airtightness is reduced, and the service life and high temperature resistance of the vacuum tube are reduced

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