杜瓦瓶（Dewars）其要结构和各部件功能如下 ：
①外筒体 ：除保护内桶体外，它还与内桶体形成真空夹层以阻止瓶外热量的侵入，减少瓶内低温液体的自然汽化量 ；
②内筒体 ：储备低温液体 ；
③汽化器 ：通过与外桶内壁的热交换，实现将瓶内的液态气体转化为气态 ；
④ 液阀 ：控制杜瓦瓶进行液体充灌或从瓶中排出液体 ；
⑤安 全阀 ：当容器的压力大于较大工作压力时自动卸压，其起跳压力略大于较大工作压力 ；
⑥排放阀 ：在杜瓦瓶灌充液体时，用此阀排放瓶内气相空间的气体，降低瓶内压力，以便快速顺利地灌充液体。其另一作用是杜瓦瓶在储存或其他情况下发生瓶内压力超过较高工作压力时，可用此阀人工排放瓶内的气体，以降低瓶内的压力 ；
⑦ 压力表 ：指示瓶内筒的压力 ；
⑧ 增压阀 ：此阀开启后，瓶内的液体便会通过增压盘管与外筒壁进行热交换，汽化为气体，进入内筒壁上部的气相空间，使气瓶建立一定的驱动压力（内压），以便驱动瓶内的低温液体，使其流动 ；
⑨ 使用阀 ：用于杜瓦瓶液体汽化回路与用户用气进口端管道通路的开启，也可以用此阀控制气体的流速 ；
⑩ 液位计 ：比较直观地指示容器内液面的高低，安装位置应便于操作人员观察和检修 。
The main structure and functions of dewars are as follows:
① Outer cylinder: in addition to protecting the inner barrel, it also forms a vacuum interlayer with the inner barrel to prevent the invasion of heat outside the bottle and reduce the natural vaporization of cryogenic liquid in the bottle;
② Inner cylinder: Reserve low temperature liquid;
③ Vaporizer: through the heat exchange with the inner wall of the outer barrel, the liquid gas in the bottle can be transformed into the gaseous state;
④ Liquid valve: control Dewar bottle to fill or discharge liquid from the bottle;
⑤ Safety valve: when the pressure of the vessel is greater than the larger working pressure, the pressure will be released automatically, and the take-off pressure will be slightly greater than the larger working pressure;
⑥ Discharge valve: when the Dewar bottle is filled with liquid, this valve is used to discharge the gas in the gas phase space in the bottle, so as to reduce the pressure in the bottle, so as to fill the liquid quickly and smoothly. The other function is that when the pressure in the Dewar bottle exceeds the higher working pressure during storage or other conditions, the valve can be used to manually discharge the gas in the bottle to reduce the pressure in the bottle;
⑦ Pressure gauge: indicating the pressure of the inner cylinder of the bottle;
⑧ Booster valve: after the valve is opened, the liquid in the bottle will exchange heat with the outer cylinder wall through the supercharging coil, vaporize into gas, and enter the gas phase space on the upper part of the inner cylinder wall, so as to establish a certain driving pressure (internal pressure) of the cylinder, so as to drive the low-temperature liquid in the bottle to flow;
⑨ Use valve: it is used to open the pipeline channel between Dewar liquid vaporization circuit and user gas inlet end, and it can also be used to control gas flow rate;
⑩ Liquid level gauge: it can directly indicate the liquid level in the container, and the installation position should be convenient for the operator to observe and repair.
