Automatic liquid nitrogen control and supplementing device of high-temperature superconductor strip mechanics experiment machine and method

Abstract

The invention discloses an automatic liquid nitrogen control and supplementing device of a high-temperature superconductor strip mechanics experiment machine and a method. The main composition of thedevice is as follows: a vertical strip driving mechanism of the high-temperature superconductor strip mechanics experiment machine is placed on a top plate, an open dewar flask is placed on a lower bottom plate and located right below the vertical strip driving mechanism, and a closed liquid supplementing dewar flask is also arranged on the lower bottom plate; a polytetrafluoroethylene rod is fixed on the side surface of the dewar flask, and a superconductor liquid level meter is fixed on the inner side of the polytetrafluoroethylene rod and not contacted with the inner wall of the dewar flask; the superconductor liquid level meter is connected to a liquid level controller, meanwhile, the liquid level controller is connected with a control end of a pressurizing valve, and the pressurizingvalve is fixed at the top of the liquid supplementing dewar flask, and the valve opening extends into the liquid supplementing dewar flask. The device can automatically ensure that liquid nitrogen inthe dewar flask always flood a high-temperature superconductor strip, time and labor are saved during experiments, the experiment efficiency is high, the experiment success rate is high, and experiment results are reliable.

Description

technical field [0001] The invention relates to a liquid nitrogen automatic control replenishment device and an automatic liquid replenishment method for a high-temperature superconducting strip mechanical testing machine. Background technique [0002] The mechanical properties of high-temperature superconducting strips are one of the important factors that determine the performance of high-temperature superconducting strips. When testing the mechanical properties of the superconducting strip on the mechanical testing machine, the strip vertical driving mechanism needs to apply vertical force to the high-temperature superconducting strip in the Dewar cavity from the vertical direction, so the top of the Dewar cavity cannot be sealed. The liquid nitrogen in the Dewar chamber will continue to volatilize; therefore, while performing mechanical experiments on high-temperature superconducting tapes, the experimenter must constantly check the height of liquid nitrogen in the Dewar...

AI Technical Summary

Problems solved by technology

When testing the mechanical properties of the superconducting strip on the mechanical testing machine, the strip vertical driving mechanism needs to apply vertical force to the high-temperature superconducting strip in the Dewar cavity from the vertical direction, so the top of the Dewar cavity cannot be sealed. The liquid nitrogen in the Dewar chamber will continue to volatilize; therefore, while performing mechanical experiments on high-temperature superconducting tapes, the experimenter must constantly check the height of liquid nitrogen in the Dewar to prevent the liquid level of liquid nitrogen from being lower than that of the high-temperature superconducting tape. material, resulting in the failure of the experiment

Especially in the experiment of mechanical fatigue characteristics of high-temperature superconducting strips, the experiment period is long and the workload is heavy. The experimenters need to observe for a long time and prepare to fill the Dewar with liquid nitrogen at any time, which is time-consuming and labor-intensive; resulting in low experiment efficiency. High failure rate, unreliable experimental results

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