Liquid level detection system based on electromagnetic wave method

Abstract

The invention provides a liquid level detection system based on an electromagnetic wave method. The system comprises: an electromagnetic wave sensor, a controller, a self-pressurization liquid nitrogen storage tank, a main electromagnetic valve, a secondary electromagnetic valve, a pressurizing valve, an exhaust pressure reducing valve and an exhaust valve. According to the liquid level detectionsystem based on the electromagnetic wave method, liquid nitrogen liquid level in the liquid nitrogen container can be detected and displayed in real time, and a function of automatic filling of the liquid nitrogen container is realized.

Description

technical field [0001] The present application relates to the technical field of liquid level detection, in particular to a liquid level detection system based on the electromagnetic wave method. Background technique [0002] In the high-temperature superconducting magnetic levitation technology, the superconducting block is usually soaked in liquid nitrogen to lower its temperature and enter the superconducting state, and the superconducting block in the superconducting state can achieve stable suspension by interacting with an external magnetic field. During the entire operation of the high-temperature superconducting maglev vehicle, it must be ensured that the superconducting block is always immersed in the liquid nitrogen in the liquid nitrogen container (for example, the vehicle-mounted Dewar) to avoid quenching. The quenching of high-temperature superconductors will cause the train to lose its suspension force, rub against the track or even derail. [0003] However, d...

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Problems solved by technology

[0005] However, since the detection methods in the prior art all use contact measurement, it is necessary to introduce cables and sensors into the liquid nitrogen container, which will increase heat conduction and thus increase the loss of liquid nitrogen

On the other hand, liquid nitrogen is a liquid with extremely low temperature and is easy to volatilize. Therefore, the material requirements for hardware such as sensors and leads for contact measurement are extremely high, and the huge temperature difference between the inside and outside of the liquid nitrogen container will cause frosting on the surface of the sensor. This will inevitably affect the accuracy and long-term stability of the entire detection system, so it is easy to cause measurement errors and is not suitable for long-term measurement

In addition, the detection of liquid nitrogen liquid level in the prior art is a semi-automatic detection scheme, which requires human participation, and cannot realize real-time detection of liquid nitrogen liquid level, low liquid level alarm, automatic filling of liquid nitrogen, full Functions such as automatic cut-off and reminder

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