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恒温器要产生一种低温坏境,第一就需要致冷。如果想要槽温恒定停留任意温度点,那就应该给出一个相对较稳定的致冷量,来消除传导、对流、辐射及搅拌等原因引起的冷损汽和发热量。恒温器应用液氮作致冷剂。液氮经输液管流入冷却器,冷却酒精。流氮大小植杜瓦瓶中的输液压力而定,输液压力越大,液氮流量越大,槽温下降速度越快。相反的情况。用高精度针阀来调节液氮流量,对槽温进行拧制。待温度恒定后,进行温场测试。
Thermostat to produce a low-temperature environment, the first need to cool. If you want a constant bath temperature to stay at any temperature, it should be given a relatively stable cooling capacity, to eliminate conduction, convection, radiation and mixing and other causes of cold loss steam and heat. Thermostat liquid nitrogen as a refrigerant. Liquid nitrogen flows through the infusion tube into the cooler to cool the alcohol. Nitrogen flow in the size of Dewar flask infusion pressure may be, the greater the pressure infusion, the greater the liquid nitrogen flow, the faster decline in tank temperature. The opposite situation. High-precision needle valve to adjust the flow of liquid nitrogen, the screw temperature of the twist. After the temperature is constant, the temperature field test.