论文部分内容阅读
一、前言在实验室中或其他一些高压纯氮比较容易获得的地方,工作在7°K附近温度下的节流式微型致冷器大多用高压纯氮作为工质气体。当高压纯氮供应困难,而又有现成的高压空气时,也可用高压空气作为这种致冷器的工质气体来获得接近于液氮的温度。只要将高压空气作适当的处理.例如去除其中所含的大量的水蒸汽和二氧化碳等冰点较高的“杂质”气体。因为这些气体在很低的温度下会结冰,堵塞热交换器的毛细管道,使致冷器停止工作。本文简单地介绍了一种小型的采用硅胶和分子筛的高压常温吸附装置,并测定了保证致冷器正常工作所允许的空气中水蒸汽和二氧化碳的最大含量。
I. INTRODUCTION Where it is relatively easy to obtain high pressure pure nitrogen in the laboratory or elsewhere, most of the throttled microcomputers operating at temperatures near 7 ° K use high pressure pure nitrogen as working gas. When high-pressure pure nitrogen is difficult to supply and there is ready-made high-pressure air, high-pressure air can also be used as the working gas of this refrigerator to obtain the temperature close to liquid nitrogen. For example, remove the high amount of “impurity” gases such as water vapor and carbon dioxide contained in the high-freezing air. Because these gases freeze at very low temperatures, clogging the heat exchanger’s capillary tubing stops the chiller from working. This article briefly introduces a small, high pressure, ambient temperature adsorption unit using silica gel and molecular sieves and determines the maximum amount of water vapor and carbon dioxide in the air that is allowed to operate properly.