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Buoyancy-type low temperature level meter

A deep-low temperature, buoyancy technology, applied in the direction of displaying liquid level indicator through pressure measurement, can solve the problems of inability to measure low-temperature liquid level, false liquid level rise and fall, etc., and achieve stable and reliable reading and stable operation.

Inactive Publication Date: 2006-11-08
INST OF PLASMA PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

However, the sensor is connected to the atmosphere. If the pressure of the measured liquid increases or decreases relative to the atmospheric pressure, this is equivalent to a change in the buoyancy of the probe, resulting in a false liquid level rise and fall, which will cause a large error, so it cannot be used for liquid level measurement of cryogenic liquids.

Method used

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  • Buoyancy-type low temperature level meter
  • Buoyancy-type low temperature level meter

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Embodiment Construction

[0015] See attached figure 1 , 2 .

[0016] Labels in the figure: 1. Pull-pressure sensor, 2. Sensor sealing shell, 3. Flange, 4. Connecting rod of buoyancy probe, 5. Anti-decoration piece, 6. Buoyancy probe, 7. Liquid nitrogen tank, 8. Pressure bearing Shell, 9. Sensor signal line leading sealed socket, 10. Amplifier / transmitter, 11. Digital display instrument, 12. Data acquisition card.

[0017] The anti-swing piece 5 is a spacer with a hollow, and the connecting rod 4 is made of an epoxy tube, and the anti-swinging piece 5 prevents the connecting rod 4 from swinging. The buoyancy probe 6 is a hollow stainless steel cylinder fixedly connected with the connecting rod 4 and located in the liquid nitrogen tank 7, which has a pressure-bearing shell 8 outside the liquid nitrogen tank 7. The upper end of the connecting rod 4 is installed on the tension-compression sensor 1 . On the one hand, the flange 3 installs the shell 2, and on the other hand, it also provides a support f...

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Abstract

This invention discloses an instrument for measuring deep low temperature liquid levels, which isolates a sensor and the atmosphere in airproof to make it in the same pressure with a tested container, so the level guage is allowed to work at the deep low temperature flume with positive or negative pressure (such as liquid N, liquid O, liquid Ar and liquid H) in which, the reading is stable, reliable. This invented level guage is used in the level measurent of the liquid N tank in a large current lead constant temperature device of a large type of EAST and not influenced by the magnetic field generated by several ten thousands of amperes.

Description

technical field [0001] The invention belongs to the liquid level measuring instrument technology, can be used in conjunction with a liquid level automatic control device, and particularly belongs to a liquid level gauge for deep and low temperature liquid level measurement. Background technique [0002] Currently on the market, there are differential pressure level gauges and radio frequency capacitance level gauges suitable for liquid level measurement at deep low temperatures (such as liquid nitrogen, liquid oxygen, liquid argon, and helium, etc.). The differential pressure level gauge is based on the principle of changing the pressure difference between the bottom pressure and the liquid surface by changing the height of the liquid level. It is quite convenient and popular for normal temperature liquid level measurement and control differential pressure liquid level gauge, and merchants provide submerged liquid differential pressure sensors and supporting amplifiers and d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/14
Inventor 毕延芳冯汉生马登奎
Owner INST OF PLASMA PHYSICS CHINESE ACAD OF SCI
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