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研制了一种新型的自动控制低温容器中液氮液面位置的方法。这个方法比一项法国专利中提出的可动底部的控制方法优越。在第二部分介绍了这种方法的原理和特点。经过实验证实:这种方法用于液面控制时。可以控制高于贮液器液面2米以上的液氮液面,受控液面的变化小于5毫米。由于管道采用真空夹套,液氮耗量很小。设备较为简单,使用安全可靠。由于热导而引起的液氮蒸发损失约为2×10~(-4)升;由于增压而引起的强迫蒸发的液氮耗量约为1.1×10~(-2)升。
A new method of automatically controlling the position of liquid nitrogen in cryogenic vessel was developed. This method is superior to the movable bottom control method proposed in a French patent. The second part introduces the principle and characteristics of this method. After experiments confirmed: This method is used when the liquid level control. Can control the liquid level above the liquid level of liquid nitrogen 2 meters, the controlled liquid level changes less than 5 mm. Due to the use of vacuum jacket pipe, liquid nitrogen consumption is very small. Equipment is simple, safe and reliable. The loss of liquid nitrogen evaporation due to heat conduction is about 2 × 10 -4 liters, and the liquid nitrogen consumption due to forced evaporation is about 1.1 × 10 -2 liters.