Dewar bottle

The main structure of Dewars:
①Outer barrel: protect the inner barrel, and also form a vacuum interlayer with the inner barrel to prevent the intrusion of heat outside the bottle, thereby reducing the natural vaporization of the low-temperature liquid in the bottle;
②Inner cylinder: Reserve low temperature liquid;
③ Vaporizer: converts the liquid gas in the bottle into a gaseous state through heat exchange with the inner wall of the outer barrel;
④ Liquid valve: control the Dewar bottle to fill the liquid or discharge the liquid from the bottle;
⑤Safety valve: When the pressure of the container is greater than the maximum working pressure, it will automatically release the pressure, and its take-off pressure is slightly greater than the maximum working pressure;
⑥ Discharge valve: When filling the Dewar bottle with liquid, use this valve to discharge the gas in the gas phase space in the bottle and reduce the pressure in the bottle, so that the liquid can be filled quickly and smoothly. Another function is that when the pressure in the Dewar bottle exceeds the maximum working pressure during storage or other conditions, this valve can be used to manually discharge the gas in the bottle to reduce the pressure in the bottle;
⑦ Pressure gauge: indicates the pressure of the inner cylinder of the bottle;
⑧ Booster valve: After this valve is opened, the liquid in the bottle will exchange heat with the outer cylinder wall through the booster coil, vaporize into gas, and enter the gas phase space on the upper part of the inner cylinder wall, so that the cylinder can establish a certain driving pressure. (internal pressure) in order to drive the cryogenic liquid in the bottle to flow;
⑨ Use valve: It is used to open the liquid vaporization circuit of the Dewar flask and the pipeline passage of the user’s gas inlet, and this valve can also be used to control the flow rate of the gas;
⑩ Liquid level gauge: intuitively indicate the level of the liquid level in the container, which is convenient for operators to observe and repair