Liquid nitrogen level automatic control device in fusion diagnostic device

Abstract

The invention discloses a liquid nitrogen level automatic control device in a fusion device diagnostic system. The device includes a main control device PLC, a capacitive liquid nitrogen level sensor in a Dewar flask, a small intermediate relay J1, an AC contactor C1, and a cryogenic solenoid valve E1. Two switching value input ends X0 and a switching value output end Y0 are arranged on the PLC. All of the X0 and the X1 are connected with output ends of the capacitive liquid nitrogen level sensor. A PLC node, a DC power supply module and a main coil of the J1 are sequentially serially connected with the Y0. An output normally-open node J1-1 of the J1 is serially connected with the main coil of the C1 and then serially connected with an AC constant-voltage source so that a loop is formed. An output normally-open node C1-1 of the C1 is serially connected with the E1 and then forms a loop with the AC constant-voltage source. The main control device PLC is also connected with an upper computer through a serial port communication cable. The liquid nitrogen level automatic control device is friendly in interface, simple to operate, and capable of saving and inquiring data at any time as to further analyze and solve problems.

Description

technical field [0001] The invention relates to the field of automatic liquid nitrogen liquid level control, in particular to an automatic liquid nitrogen liquid level control device in a fusion diagnosis device. Background technique [0002] The invention relates to an automatic liquid nitrogen liquid level control device in a fusion device diagnosis system. When the EAST device experiment is running, the Michelson interferometer is used to diagnose the plasma electron cyclotron radiation, and finally obtain the electron temperature distribution. The detector as the core component of the Michelson interferometer needs to work in a low-temperature environment protected by liquid nitrogen, and liquid nitrogen is volatile. If the consumed liquid nitrogen cannot be replenished in time every day, the detector will not work properly or even be damaged. If you don't know the consumption of liquid nitrogen, relying on manual replenishment of liquid nitrogen every day will not only...

AI Technical Summary

Problems solved by technology

The detector as the core component of the Michelson interferometer needs to work in a low-temperature environment protected by liquid nitrogen, and liquid nitrogen is volatile. If the consumed liquid nitrogen cannot be replenished in time every day, the detector will not work properly or even be damaged.

If you don't know the consumption of liquid nitrogen, relying on manual replenishment of liquid nitrogen every day will not only take time and effort, but also cause waste of liquid nitrogen, and it is impossible to accurately judge the liquid nitrogen level

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