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本刊1977年第3期刊登了《自制液体内热式自动循环加热炉》,部分读者提出了如下两个问题:1.在加热过程中是如何使油循环的?2.水银温度计所测到的为什么是底部油层的温度?现特说明于下。如图所示,油炉共有三组加热电阻,每组电阻丝串连通过四个瓷管7。瓷管竖装在油桶6内。通电加温时,管内的油因温度增高而上升,由管顶口流出,同时冷油自管底口流人,这样就形成循环对流,使桶内油温均匀上升。
This issue of the third issue of 1977 published “self-made liquid heat automatic circulation furnace,” some readers raised the following two questions: 1. In the heating process is how to make oil cycle? 2. Mercury thermometer measured Why is the bottom of the reservoir temperature? As shown in the figure, there are three heating resistors in the oil furnace, and each resistance wire is connected in series through four ceramic tubes 7. Porcelain tube installed in the drum 6 vertical. When the electricity is heated, the oil in the pipe rises due to the increase of temperature, and flows out from the top of the pipe. At the same time, the cold oil flows from the bottom of the pipe. Thus, circulation convection is formed and the temperature of the oil in the tub rises uniformly.