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Main structure of low temperature dewar
Date: Jun 02, 2020
The main structure and functions of Dewars are as follows:
①Outer cylinder: In addition to protecting the outer body of the inner barrel, it also forms a vacuum interlayer with the inner barrel to prevent the intrusion of heat outside the bottle and reduce the natural vaporization of low-temperature liquid in the Dewar;
②Inner cylinder: reserve cryogenic liquid;
③ Vaporizer: Through the heat exchange with the inner wall of the outer barrel, the liquid gas in the Dewar is converted into the gaseous state;
④ Liquid valve: control the Dewar to fill the liquid or discharge the liquid from the bottle;
⑤Safety valve: When the pressure of the pressure vessel is greater than the maximum working pressure, the pressure is automatically relieved, and its jumping pressure is slightly greater than the maximum working pressure;
⑥Drain valve: When the Dewar bottle is filled with liquid, use this valve to discharge the gas in the gas phase space in the bottle to reduce the pressure in the gas bottle to fill the liquid quickly and smoothly. Its other function is that when the pressure in the Dewar bottle exceeds the maximum working pressure during storage or other conditions, the valve can be used to manually discharge the gas in the Dewar 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 gas cylinder will exchange heat with the outer cylinder wall through the booster coil, vaporize into a gas, enter the gas phase space above the inner cylinder wall, and establish a certain drive Pressure (internal pressure) in order to drive the low-temperature liquid in the bottle to make it flow;
⑨ Use valve: It is used to open the pipeline path of the Dewar liquid vaporization circuit and the gas inlet end of the user, and this valve can also be used to control the gas flow rate;
⑩ Liquid level gauge: intuitively indicate the level of the liquid level in the container, the installation position should be easy for the operator to observe and repair
①Outer cylinder: In addition to protecting the outer body of the inner barrel, it also forms a vacuum interlayer with the inner barrel to prevent the intrusion of heat outside the bottle and reduce the natural vaporization of low-temperature liquid in the Dewar;
②Inner cylinder: reserve cryogenic liquid;
③ Vaporizer: Through the heat exchange with the inner wall of the outer barrel, the liquid gas in the Dewar is converted into the gaseous state;
④ Liquid valve: control the Dewar to fill the liquid or discharge the liquid from the bottle;
⑤Safety valve: When the pressure of the pressure vessel is greater than the maximum working pressure, the pressure is automatically relieved, and its jumping pressure is slightly greater than the maximum working pressure;
⑥Drain valve: When the Dewar bottle is filled with liquid, use this valve to discharge the gas in the gas phase space in the bottle to reduce the pressure in the gas bottle to fill the liquid quickly and smoothly. Its other function is that when the pressure in the Dewar bottle exceeds the maximum working pressure during storage or other conditions, the valve can be used to manually discharge the gas in the Dewar bottle to reduce the pressure in the bottle;
⑧ Booster valve: After this valve is opened, the liquid in the gas cylinder will exchange heat with the outer cylinder wall through the booster coil, vaporize into a gas, enter the gas phase space above the inner cylinder wall, and establish a certain drive Pressure (internal pressure) in order to drive the low-temperature liquid in the bottle to make it flow;
⑨ Use valve: It is used to open the pipeline path of the Dewar liquid vaporization circuit and the gas inlet end of the user, and this valve can also be used to control the gas flow rate;
⑩ Liquid level gauge: intuitively indicate the level of the liquid level in the container, the installation position should be easy for the operator to observe and repair
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