Heat tube type all-glass vacuum solar collector tube

Abstract

The invention discloses a heat tube type all-glass vacuum solar collector tube which belongs to the field of solar energy utilization equipment and is formed by combining an all-glass vacuum solar collector tube (1) and an all-glass heat tube (2); the evaporation section (3) of the all-glass heat tube (2) is formed by an inner glass tube (9) in the all-glass evacuated solar collector tube (1), and the condensation section (4) of the all-glass heat tube (2) is formed by coaxially extending the inner glass tube (9) outwards from a ring seal cup opening (1) of the all-glass vacuum solar collector tube (1) with equal diameter; the wall thickness of the inner glass tube (9) is more than that of a cover glass tube (8) of the all-glass vacuum solar collector tube (1) by 0.8-1.2 mm, and the thickness of the glass wall of the hot seal end (5) on the condensation section (4) is equal to the thickness of the wall of the cover glass tube (8); a heat transfer medium (7) is filled in a vacuum cavity (6) of the all-glass heat tube (2), and the volume ratio of the heat transfer medium (7) and the vacuum cavity (6) is 0.05%-0.4%; and the length L1 of the condensation section (4) is 70-150mm. The heat tube type all-glass evacuated solar collector tube integrates the heat collection and heat transferring, is quick in heat transfer speed, high in heat efficiency, good in performance, safe and reliable, easy to manufacture, low in cost, convenient to install and transport and easy to promote and apply, and the national performance standards can be met.

Description

technical field [0001] The invention belongs to the field of solar energy utilization equipment, and relates to a heat pipe type all-glass vacuum solar heat collection pipe. Background technique [0002] In solar collectors and water heaters, there are three ways to combine glass vacuum solar collector tubes and heat pipes. The first is to place metal heat pipes with heat absorbers in single-layer glass tubes, and vacuumize the gap between the two, and use The disadvantage of sealing the vacuum cavity by metal and glass thermal compression sealing is that the properties of metal and glass are very different. Therefore, the process of sealing the vacuum cavity by thermal compression sealing is complicated, difficult, unreliable, and high in cost; The second is to insert a metal heat pipe with a heat absorbing body (such as fins) into an all-glass vacuum solar heat collector. Since the gap between the two is not vacuum, the application effect is not ideal and the cost is high;...

AI Technical Summary

Problems solved by technology

[0002] In solar collectors and water heaters, there are three ways to combine glass vacuum solar collector tubes and heat pipes. The first is to place metal heat pipes with heat absorbers in single-layer glass tubes, and vacuumize the gap between the two, and use The disadvantage of sealing the vacuum cavity by metal and glass thermal compression sealing is that the properties of metal and glass are very different. Therefore, the process of sealing the vacuum cavity by thermal compression sealing is complicated, difficult, unreliable, and high in cost; The second is to insert a metal heat pipe with a heat absorbing body (such as fins) into an all-glass vacuum solar heat collector. Since the gap between the two is not vacuum, the application effect is not ideal and the cost is high; the third is The inner glass tube of the all-glass vacuum solar collector tube is used as the shell of the evaporation section of the heat pipe, and the glass condensation section of the heat pipe is also provided. The biggest advantage is that the structure is simple, the cost is low, the application effect is good, and it is conducive to popularization and application. The disadvantage is that, Both the inner glass tube and the cover glass tube are glass tubes with conventional wall thickness (that is, the national standard is 1.6±0.2mm), and their compressive strength is relatively low, which limits the amount of heat transfer working medium added to the heat pipe vacuum cavity. If the amount of heat transfer fluid is too much, the pressure in the heat pipe will be high during application, and the heat pipe will easily burst, which will affect the normal use. If the amount of heat transfer fluid is too small, the thermal efficiency will be reduced and the use effect will be affected. On the other hand, if the application No. 200420050936.7 in the disclosed technical scheme, the glass condensation section of the heat pipe is realized by burning a glass butt joint pipe at the ring-sealed cup mouth of the all-glass vacuum solar heat collector, which will make the all-glass vacuum solar heat collector Secondary thermal stress is generated, and it is difficult to effectively eliminate it, which will cause safety hazards, and at the same time, there are many consumables and long labor hours

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