Continuous film coating device and film coating process thereof for inner wall of outer glass tube of solar heat collecting tube

Abstract

The invention relates to a continuous film coating device for an inner wall of an outer glass tube of a solar heat collecting tube. The device comprises a vacuum extractor, wherein the vacuum extractor is connected with the orifice end of the outer glass tube; a glass tube supporting device is arranged at the round head end of the outer glass tube; a movable high frequency device which is connected with the outer glass tube is arranged at the lower part of the outer glass tube; and a film coating device corresponding to the high frequency device is arranged in the outer glass tube. Meantime, the invention also discloses a film coating process using the device. The invention can directly coat a reflecting film with a designed radian according to the size of the central angle of the reflecting mirror of the glass tube, is suitable for large-scale mechanized production, and can greatly improve the film coating rate and ensure the film coating quality; and because a heat source is movable, the requirement for a vacuum operation space of vacuum film coating is greatly reduced, and a large vacuum chamber does not need to be established, thereby saving the production cost, greatly reducing the vacuum extracting time, and improving the production efficiency.

Description

[0001] technical field [0002] The invention relates to a solar heat collection tube technology, in particular to a continuous coating device and a coating process for the inner wall of a glass tube outside the solar heat collection tube. Background technique [0003] The solar collector tube is the key component of solar water heater heat collection. In practical application, the absorbing film layer plated on the outer surface of the inner tube of the traditional solar heat collecting tube can only collect heat on the part facing the sun, while the part on the back of the sun can hardly collect heat, which is wasted. How to make the absorbing film layer of the heat collecting tube all receive sunlight radiation and collect heat in the direction of 360° is the key problem. [0004] If a planar reflector is placed outside the back of the solar heat collecting tube, it may be able to slightly improve the heat collecting effect, but because there is no focusing effect, the h...

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Problems solved by technology

[0004] If a planar reflector is placed outside the back of the solar heat collecting tube, it may be able to slightly improve the heat collecting effect, but because there is no focusing effect, the heat collecting effect cannot reach the best state; Dust is easy to accumulate on the mirror, and people usually don't clean it, so the mirror can't play its due role, that is, the external flat mirror doesn't play a big role

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