Vacuum pipe solar heat collector having temperature control and protection function

Abstract

The invention discloses a vacuum pipe solar heat collector having a temperature control and protection function. By adding a method that a hard light insulation bushing can be automatically stretched, the control of the water temperature and the liquid level inside the water tank can be realized, and a heat collection pipe can be heat insulated and protected. The addition devices comprise an automatic telescopic bushing, a slotted hole corresponding to a bottom support saddle, a driving controller, a sensing device and the like. The heat collector is divided into a heat collection mode and a protection mode; under the heat collection mode, the bushing is in a retraction state, the heat collector receives the solar energy normally; and under the protection mode, multiple sections of heat insulation bushings are in an unfolding state so as to isolate the recontact of the heat collection pipe to the solar radiation and the air. By switching the two modes, the heat collector can well overcome main weaknesses of the traditional vacuum pipe solar heat collector.

Description

technical field [0001] The invention relates to a vacuum tube solar heat collector with temperature control and protection functions. Through the contraction and expansion action of the heat-insulating hard sleeve, the switching between the protection mode and the heat collection mode of the solar heat collector is realized. Background technique [0002] Under the impact of energy pressure, domestic new energy solar energy related industries have developed rapidly in recent years. With the improvement of living standards, people's requirements for comfort have also increased accordingly. At present, the design essence of solar energy products has also turned into "new, reasonable and humanized" to achieve maximum energy saving and meet people's production and living needs. [0003] In the hot summer, due to the high thermal efficiency of the vacuum tube solar water heater, the average temperature of the water in the hot water tank during the day can reach above 90°C. When t...

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Problems solved by technology

[0003] In the hot summer, due to the high thermal efficiency of the vacuum tube solar water heater, the average temperature of the water in the hot water tank during the day can reach above 90°C. When the temperature exceeds 75°C, it is easy to generate scale, and the scale will accumulate on the upper layer of the heat collecting tube. Since the thermal conductivity of the scale is very low, that is, its thermal conductivity is very poor, the accumulated scale will gradually affect the thermal efficiency of the entire system. The service life of the heat collecting tube; when the water temperature is too high, it will also cause part of the water in the heat collecting tube to evaporate, resulting in waste of resources; in addition, the vacuum tube collector is prone to thermal short circuit at high temperature, and tube explosion is prone to occur in freezing environment Phenomenon, and can not withstand air drying, that is, too little water in the heat collecting tube and the water collecting tank; in addition, because the mouth of the heat collecting tube of the traditional all-glass vacuum tube collector and the hole of the inner tank of the header are directly connected by a sealing ring Connected, and the heat collecting tube is directly exposed to sunlight, which will lead to poor thermal shock resistance of the heat collecting tube and shorten the service life; in harsh environments such as rain, snow, hail, etc., the vacuum heat collector is also easily damaged by impact

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