System for measuring evaporation rate of cryogenic vessel with stable back pressure

A low-temperature container and measurement system technology, which is applied in the direction of mass flow measurement devices, etc., can solve problems such as large evaporation rate measurement errors, achieve good voltage stabilization effect, ensure pressure, and control the effect of high degree

Inactive Publication Date: 2014-04-02
SHANGHAI MICROPOWERS
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a low-temperature container evaporation rate measurement system with stable back pressure, which solves the technical problem that the current low-temperature container cannot stabilize the back pressure, resulting in a large erro

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  • System for measuring evaporation rate of cryogenic vessel with stable back pressure

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Embodiment Construction

[0017] The present invention will be further described in detail below in conjunction with the above-mentioned embodiments of the accompanying drawings.

[0018] The cryogenic container 1 is used to store cryogenic media, such as liquid oxygen and liquid nitrogen. Since the cryogenic container 1 cannot be absolutely insulated, it will inevitably evaporate naturally. In order to accurately measure the amount of gas emitted by evaporation, in figure 1 In the embodiment, a heat exchanger 5, a connecting pipe 6, a gas mass flow meter 7, a connecting pipe 8, and a buffer tank 11 are sequentially arranged on the discharge pipeline of the cryogenic container 1, that is, after the vent pipe 2, the vent valve 3 and the connecting pipe 4, The gas is then discharged to the atmosphere through the discharge pipe 13 . The system also includes a back pressure control system for regulating the pressure of the buffer tank 11, which includes a pressure sensor 10, a programmable controller 16, a...

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Abstract

The invention discloses a system for measuring evaporation rate of a cryogenic vessel with stable back pressure. The system comprises a gas emission pipeline. An emptying valve and a gas mass flow meter are arranged on the gas emission pipeline. The outlet of the gas mass flow meter is provided with a buffer tank; the buffer tank is connected with a discharge pipe. The system also comprises a back pressure control system. The back pressure control system comprises a pressure sensor, a programmable controller, a computer, a pressure controller, a rapid exhaust line and a rapid gas supply system. The pressure controller is used for controlling pressure in the buffer tank; the input end of the pressure controller is connected with the computer and the programmable controller; the pressure controller is also connected with three gas control connectors of the rapid exhaust line, the rapid gas supply system and the buffer tank; the input end of the programmable controller is connected with the gas mass flow meter and the pressure sensor. The system can be used for effectively reducing influences of environment pressure changes on the evaporation rate of the cryogenic vessel, and has the characteristics that the structure is simple, and the measuring accuracy is high.

Description

technical field [0001] The invention relates to cryogenic engineering, in particular to a system for measuring the evaporation rate of cryogenic containers. Background technique [0002] The evaporation rate of the cryogenic container is the most important technical parameter to evaluate its thermal insulation performance, which can directly reflect the cold storage performance of the cryogenic container. At present, in the field of cryogenic equipment, a simple test device composed of a vent valve, a heat exchanger and a gas mass flowmeter in series is used to measure the instantaneous evaporation of the cryogenic container. After the gas-liquid interface in the cryogenic container reaches equilibrium, the The instantaneous evaporation collected continuously for at least 24 hours was converted to obtain the evaporation rate. For example, this static evaporation rate measurement method is recommended in GB / T18443.5-2010 performance test method of vacuum adiabatic cryogenic ...

Claims

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Application Information

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IPC IPC(8): G01F1/76
Inventor 刘惠民冯慧华黄欢明苏晨光
Owner SHANGHAI MICROPOWERS
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