Device and method for sealing metal and glass

Abstract

The invention relates to a device and method for sealing metal and glass. The device comprises a base (1), a working platform (2), an upright column (3), a screw rod (10), a synchronous rotating shaft (4), an upper clamp (7), a lower clamp (6), an upper coaxial positioning device (13), a lower coaxial positioning device (12), a movable positioning device (8), a heating fire head (11), an upper motor driving device (9) and a lower motor driving device (5), wherein the movable positioning device (8) moves up and down along the upright column (3) for positioning to control the upper clamp (7) which clamps a glass tube to move in a vertical direction and be positioned; the upper clamp (7) and the lower clamp (6) can synchronously and coaxially rotate; the upper coaxial positioning device (13) and the lower coaxial positioning device (12) are provided with a spring retractable device (17) and a rotating wheel (16); and the heating fire head (11) is provided with at least two spray nozzles which are annularly arranged. According to the method for sealing the metal and the glass, soften glass can be fast subjected to double-surface sealing on a metal wall surface by utilizing the gravity action of the soften glass.

Description

technical field [0001] The invention relates to a metal-glass sealing device and a sealing method for high-temperature solar vacuum heat collecting tubes. Background technique [0002] High-temperature solar vacuum heat collector tubes are generally used in trough solar thermal power generation systems. The incident light is focused on the heat collector tube through a parabolic reflector that can track the sun. The heat collector tube absorbs sunlight to heat the working medium in the tube, thereby generating high-temperature steam. High-temperature solar vacuum heat collectors generally include a metal inner tube with a selective radiation-absorbing coating and a glass tube surrounding the metal inner tube. Due to the different expansion coefficients and different operating temperatures between the glass tube and the metal inner tube, the glass tube and the metal tube The difference in axial expansion between the inner tubes is alleviated by bellows located at both ends. ...

AI Technical Summary

Problems solved by technology

For example, the U.S. Patent US6324870 proposes a kind of high borosilicate glass (Pyrex glass) with an expansion coefficient of 17×10 -6 / K stainless steel for non-matching sealing method, the stainless steel with high expansion coefficient is processed into a very thin tip (less than 0.1mm), and then heated on a glass lathe for heat fusion sealing with high borosilicate glass, through the thin wall The elastic-plastic deformation of stainless steel relieves the thermal stress after sealing, but this technology requires glass operators to have a higher technical level and operating experience, first burn the glass on the outer wall of the metal, and then burn the inner wall, but in the operation Because the metal is too thin, it is easy to deform and wrinkle at high temperature, and it is difficult to form a good seal

[0005] CN101602579A invention patent proposes a heat-melt sealing process for metal-glass solar vacuum heat collecting tubes. The high-frequency electromagnetic induction heating method is used to realize the heat-melt sealing of glass and metal. This sealing method is used for glass with a low softening temperature. The effect is better when it is sealed with metal, but for glass with high softening temperature such as high borosilicate glass, due to the small contact area between metal and glass, it will take too long to soften or melt the glass simply by relying on the heat conduction from the metal end to the glass , even the problem that the metal temperature has reached the high temperature limit but the glass temperature has not reached the melting state, so it is difficult to effectively seal the glass with high softening temperature

Images