Novel high-temperature solar vacuum heat-gathering pipe sealed by ceramic copper cladding

Abstract

The invention relates to a novel high-temperature solar vacuum heat-gathering pipe sealed by ceramic copper cladding, which belongs to the field of solar utilization. The invention discloses the novel high-temperature solar vacuum heat-gathering pipe sealed by ceramic copper cladding, which comprises a high borosilicate glass tube, a metal tube, corrugated tubes and a sealing connection part, wherein the high borosilicate glass tube is coated with an anti-reflection film; the metal tube is coated with a heat adsorbing coating and is coaxially installed in the centre of the high borosilicate glass tube; the corrugated tubes are arranged at the two ends for compensating heat expansion; the sealing connection part is arranged between the corrugated tubes and includes a ceramic copper cladding element; vacuum is reserved between the glass tube and the metal tube; and the glass and the metal are hermetically connected through the ceramics covered by the copper cladding. With the adoption of the new technology of the ceramic copper cladding, a copper metal attached on the ceramics can also be reliably connected with the ceramics under the condition of high temperature; the ceramics and the high borosilicate glass have approximate expansion coefficients, and the expansion coefficient of the copper is approach to the expansion coefficient of steel wires so that the connection of the sealing part has high reliability, the kovar connection with high cost and complicated process is avoided, and the prior art is replaced by the simple and reliable process; and meanwhile, the linear expansion difference of the metal and the glass is compensated by the corrugated tube.

Description

technical field [0001] The invention relates to a novel high-temperature solar vacuum heat-gathering tube, in particular to a high-temperature solar vacuum heat-gathering tube sealed with ceramic copper, and belongs to the field of solar technology utilization. Background technique [0002] High-temperature solar vacuum heat-collecting tubes are the core components in systems such as trough solar thermal power generation and solar medium-high temperature hot water projects. The heat-gathering temperature of ordinary solar water heater vacuum heat-collecting tubes is relatively low, while the temperature of solar water desalination requires more than 120°C Temperature heat source, trough solar thermal power generation requires a temperature heat source above 300°C, while high-efficiency trough solar thermal power generation requires a higher heat source temperature. High-temperature heat-gathering vacuum tubes are a bottleneck. The key to solving this problem is to solve the v...

AI Technical Summary

Problems solved by technology

[0003] The commonly used seal is Kovar seal, which is not only costly but also complex in process, and when the temperature reaches a certain value, it is easy to break or cause vacuum failure due to internal stress; The glass tube greatly shortens the length of the corrugated tube and increases the effective length of the vacuum heat collecting tube, but the seal is still sealed with Kovar

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