Solar evacuated collector tube

Abstract

The invention provides a solar evacuated collector tube which comprises an inner-layer glass tube and an outer-layer glass tube. A vacuum layer is arranged between the inner-layer glass tube and the outer-layer glass tube. A glass cavity is formed in the bottom of the inner-layer glass tube and communicated with the vacuum layer through a hole, an annular sealing board for connecting the inner-layer glass tube with the outer-layer glass tube is arranged in the vacuum layer, and the vacuum space below the port, in the vacuum layer, of the hole and the space above the vacuum space are isolated. The upper surface of the annular sealing board is not lower than the lower side of the port. The glass cavity contains mercury. When the temperature of the mercury is lower than 90% of the boiling point of liquid in the inner-layer glass tube at the standard atmospheric pressure, the volume of the mercury is smaller than the volume of the glass cavity; when the temperature of the mercury reaches the boiling point, mercury expands so that the glass cavity and the vacuum space above the annular sealing space are filled with the mercury. The solar evacuated collector tube has the excellent anti-explosion performance, and an explosion is not likely to happen even under the environment that a pressure relief hole is not available.

Description

technical field [0001] The invention relates to the field of solar energy equipment, in particular to a vacuum heat collecting tube. Background technique [0002] At present, ordinary vacuum heat collecting tubes are composed of inner and outer glass tubes, and there is a vacuum interlayer between the two layers of glass tubes. Since the water body or medium in the pipe will continue to heat up during the process of being continuously irradiated by the sun, if the pressure is not released in time, it is easy to cause a pipe burst. In actual use, typically, if you forget to add water to the solar water heater, it is extremely easy to burst the pipe in summer. On the other hand, in order to release the pressure of the vacuum heat collecting tube, it is necessary to open air holes on the heat preservation equipment. Due to the beginning of the air holes, the heat preservation effect is affected, and the heat storage capacity of the outdoor solar energy equipment is greatly r...

AI Technical Summary

Problems solved by technology

Since the water body or medium in the pipe will continue to heat up during the process of being continuously irradiated by the sun, if the pressure is not released in time, it is easy to cause the pipe to burst

In actual use, typically, if you forget to add water to the solar water heater, it is extremely easy to burst in summer

On the other hand, in order to release the pressure of the vacuum heat collecting tube, it is necessary to open air holes on the heat preservation equipment. Due to the beginning of the air holes, the heat preservation effect is affected, and the heat storage capacity of the outdoor solar energy equipment is greatly reduced.

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