The thermos, also called the thermos, was invented by the English scientist Dewar. In 1900, for the first time, he turned compressed hydrogen into a liquid, liquid hydrogen. This kind of thing has to be packed in bottles, but there is no such thermos at the time. He developed it himself. He uses a vacuum method to make a double-layered bottle, which removes the air in the compartment and cuts off the conduction. However, after this heat radiation will also affect the insulation, so Dewar applied a layer of silver or reflective paint in the vacuum compartment to block the heat radiation. Then use a stopper to block the bottle mouth. In this way, the three methods of heat conduction are cut off, and the bottle liner can maintain the temperature for a long time. He used this bottle to store liquid hydrogen. Later, it was widely used, and almost every one has a thermos bottle or a thermos. As shown in the figure, the circuit diagram of the Guangri brand GR70-A-10 electronic thermos.
Oil coolers are also called oil coolers. According to the principle of the refrigeration system, the liquid refrigerant with low temperature and low pressure exchanges heat with the surrounding water in the evaporator. The evaporator absorbs the heat of the oil and evaporates into a gaseous state with low temperature and low pressure. , The low-temperature and low-pressure gaseous refrigerant enters the compressor, is compressed by the compressor, is compressed into a high-temperature and high-pressure gaseous state, and then enters the condenser, where it exchanges heat with the indoor medium, and part of the heat in the high-temperature and high-pressure gaseous state is removed. The medium absorbs, the temperature of the medium rises, the refrigerant releases heat and turns into a high temperature and high pressure liquid state, and the condenser process temperature remains unchanged, and then enters the expansion valve for throttling. Throttling is a process of rapid cooling, and the refrigerant becomes a low temperature and low pressure liquid state. The latter refrigerant enters the evaporator for heat exchange and evaporation, thereby realizing the entire process of the refrigeration system. This cycle is carried out continuously, so that the oil can be continuously refrigerated.
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