Metal-glass directly-sealed type solar high-temperature heat collecting pipe

Abstract

Provided is a metal-glass directly-sealed type solar high-temperature heat collecting pipe. An outer glass pipe (4) is sleeved with an inner stainless steel coating pipe (7). The two ends of the outer glass pipe are each connected with a metal-glass sealing alloy ring (2) in a matched sealing mode. Each alloy ring (2) and an expansion compensator (1) form a vacuum cavity in a welded mode. A hydrogen penetrating material (5) and a long-acting getter (6) are arranged in each expansion compensator (1). A hydrogen resistant coating (8) is prepared on the inner wall of the inner stainless steel coating pipe (7). A heat absorbing coating (10) is prepared on the outer wall of the inner stainless steel coating pipe (7). An antireflection film (3) is prepared on the outer wall of the outer glass pipe (4). A reflection film (9) is prepared on the inner wall of one side of the outer glass pipe (4). By the adoption of the unique conical expansion compensators, the wall thickness and length of corrugated pipe portions are further reduced, the effective absorption area of the heat collecting pipe is increased, and meanwhile the heat dissipation area is reduced. The metal-glass directly-sealed type solar high-temperature heat collecting pipe is resistant to high temperature and high pressure, capable of being used at the maximum temperature of 700 DEG C, capable of bearing 2 Mpa or higher pressure, wide in application range and convenient to maintain.

Description

technical field [0001] The invention relates to a metal-glass directly-sealed solar high-temperature heat collection tube. In the heat collection tube, a stainless steel coated inner tube (7) is inserted into a glass outer tube (4). A metal-glass sealing gold ring (2) is sealed, and the alloy ring and the expansion compensator (1) are welded to form a vacuum cavity; the expansion compensator (1) is equipped with a hydrogen permeable material (5) and a long-term getter (6); on the inner wall of the stainless steel coated inner tube (7), a hydrogen barrier coating (8) is prepared, and on the outer wall of the stainless steel coated inner tube (7), a heat absorbing coating (10) is prepared; on the glass An anti-reflection film (3) is prepared on the outer wall of the outer tube (4), and a reflective film (9) is prepared on the inner wall of one side of the glass outer tube (4). It is characterized by the use of a unique conical expansion compensator, which further reduces the wa...

AI Technical Summary

Problems solved by technology

First, the expansion compensator affects the heat collection efficiency of the heat collection tube

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