Ultra-low temperature liquid-level meter
A liquid level gauge, low temperature technology, applied in the field of liquid level gauges, can solve the problems of reducing convection and radiation heat transfer, and achieve the effect of improving the scope of application
Inactive Publication Date: 2008-12-17
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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Problems solved by technology
Since the liquid level gauge must be connected to the low-temperature liquid when measuring the liquid level, it is necessary to cut off the conduction path between the liquid level gauge and the external environment, and reduce convection and radiation heat transfer to solve the problem of low-temperature liquid level measurement
Method used
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Embodiment 1
[0026] Process the 4mm 18-8 stainless steel into the outer tube 5, reserve a vacuum plug 12, fix the upper end on the measuring cylinder 6, and fix the lower end on the lower end flange of the measuring cylinder 6, and use argon arc welding to keep the wall distance 1.0cm, and a mixed powder of expanded perlite powder and a small amount of bright copper powder is added between the outer tube 5 and the measuring cylinder 6, and then the space between the outer tube 5 and the measuring cylinder 6 is evacuated to form a vacuum layer 15. Less than 1.33Pa, seal the vacuum plug 12.
[0027] The inside of the magnetic rotating column liquid level display mechanism 9 is vacuumized first and then filled with dry nitrogen, so as to prevent the moisture in the air from freezing or dew condensation at low temperature, which will affect its observation effect.
[0028] Together with other parts of the common magnetic rotary column level gauge, the low temperature type magnetic rotary colum...
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The invention relates to a low-temperature magnetic rotary column level meter. Based on the vacuum thermal insulation principle, an outer pipe (5) is added outside a measurement pipe (6) of a conventional magnetic rotary column lever meter to form a vacuum layer (15) between the outer pipe (5) and the outer wall of the measurement pipe (6); the vacuum layer is vacuumized after filled with noninflammable nonmagnetic fine powder or fibers with low heat transfer coefficient, low density and no volatile impurities; a level display mechanism (9) is fixed on the outer side of the outer pipe (5); and the level display mechanism (9) is vacuumized or the air therein is replaced by dry air to completely solve the problem of the magnetic rotary column level meter such as icing and condensation when used for low-temperature level measurement, thus widening the use range of the magnetic rotary column level meter. The low-temperature magnetic rotary column level meter can be widely used for measuring the level of low-temperature liquid in containers such as tower, tank, jar, and reaction kettle in various industries such as petroleum, chemical engineering, medicine and refrigeration, particularly for level measurement of a physical property liquid in a container at the temperature of 0 to subzero196 DEG C.
Description
technical field [0001] The invention relates to a liquid level gauge, in particular to a liquid level gauge for testing the liquid level of ultra-low temperature liquid. Background technique [0002] Measurement of the liquid level of low-temperature liquid in various towers, tanks, tanks, reactors and other containers in petroleum, chemical, pharmaceutical, refrigeration and other industries, especially the liquid level of physical liquid in the container within the range of medium working temperature 0 ~ -196 ℃ Compared with the liquid level measurement of normal temperature liquid, it has special difficulties. [0003] Common liquid level gauges such as float level gauges and glass plate level gauges are not suitable for liquid level measurement of cryogenic liquids due to their large heat transfer, difficulty in assembly and disassembly, frosting, low temperature embrittlement, static electricity accumulation, etc.; The application of the blue film pressure sensor is li...
Claims
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IPC IPC(8): G01F23/30
Inventor 许鸿禧张劲松周朝刚吴剑波
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD