The structure of the all-glass vacuum tube is composed of inner glass tube, solar selective absorption coating, vacuum interlayer, cover glass tube, support (spring clip), getter and other parts.
1. The inner glass tube is used as a water flow pipe;
2. Copper oxide, black nickel, black chrome, black zinc, black copper and other solar selective absorption coatings are uniformly coated on the outer surface of the inner glass tube through the use of vacuum deposition, sputtering technology, electrochemical treatment and other processes. To absorb solar radiation energy;
3. Seal the inner glass tube coated with selective coating in the cover glass, and then evacuate the inner and outer glass tubes to form a vacuum interlayer with a vacuum degree of 0.05 Pa to reduce heat caused by air convection and conduction Loss, which is similar to the principle of a thermos;
