External expansion joint type glass-metal sealing-in end socket structure with internal shielding cover

Abstract

The invention provides an external expansion joint type glass-metal sealing-in end socket structure with an internal shielding cover. The external expansion joint type glass-metal sealing-in end socket structure is particularly suitable for a groove type photo-thermal high-temperature heat collecting pipe. The structure is mainly characterized in that a metal shielding cover (8) is connected to a metal end cover (2), and is arranged between a metal pipe (1) and an external expansion joint (3), so that the heat of the medium in a metal pipe (1) can be preventing from being transmitted to the outside; the shielding cover (8) is used for shielding a glass-metal sealing-in part, thus, the temperature of the sealing-in part is reduced, and an effect of thermal shock protection can be achieved; and the sealing-in part comprises a kovar alloy ring (4), a piece of transition glass (5) wrapped on the kovar alloy ring (4), and a glass pipe (6) connected with the piece of transition glass, so that protection for the sealing-in part is finally favorably achieved, air tightness in sealing is improved, and service life of the heat collecting pipe is prolonged.

Description

technical field [0001] An external expansion joint type glass-metal sealing terminal structure with an internal shield is especially suitable for trough-type photothermal high-temperature heat collection tubes. Through the function of the inner shield, the structure makes the glass-metal sealing part have better sealing strength and high airtightness, and is especially suitable for the glass-metal sealing part of the glass-metal sealing end of the high-temperature heat collection tube. Thermal Shock Impact Protection. Background technique [0002] Solar thermal power generation uses a curved reflector to optically focus solar energy, heats the medium in the heat collecting tube, and then generates high-temperature and high-pressure steam through heat exchange, which drives a steam turbine to generate electricity. It is a photothermal power conversion process. The heat collection system of solar thermal power generation is the key core component of the whole power generation...

AI Technical Summary

Problems solved by technology

The structure of the inner expansion joint heat collector is novel, but the structure is too complex and difficult to implement; the outer expansion joint heat collector has a simple structure, but the reliability of the sealing part is relatively poor. The main reason is that when the heat collector is in normal operation, The temperature of the medium in the metal tube (1) even reaches above 450°C. Even if a vacuum is formed between the glass tube and the metal tube, the surface temperature of the glass tube (6) will reach 90-120°C, while the temperature of the glass-metal sealing part Higher, even reaching 150-180°C, 30-60°C higher than the surface temperature of the glass tube (6), the heat source mainly lies in the radiation heat of the metal tube (1), and along the metal end cover (2) and expansion joint ( 3) Heat from heat conduction

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