Liquid level sensor and liquid level detection method thereof

Abstract

The invention provides a liquid level sensor and a liquid level detection method thereof. The liquid level sensor comprises an electroconductive unit, a grounding contact and a capacitance detection module, the electroconductive unit is mounted at a reference surface position, the grounding contact is used for being grounded, and the capacitance detection module is used for judging whether capacitance between the electroconductive unit and the grounding contact changes or not. The electroconductive unit is arranged at the reference surface position, and whether the capacitance between the electroconductive unit and the grounding contact changes or not is detected through the capacitance detection module in real time so as to judge whether a contact surface of a first medium and a second medium is below or above a reference surface. The liquid level sensor is high in automation level, quite flexible in mounting and positioning, small in mounting space, high in detection accuracy and high in resistance to electromagnetic interference.

Description

technical field [0001] The invention relates to the technical field of detection, in particular to a liquid level sensor and a liquid level detection method thereof. Background technique [0002] There is an oil tank inside the sewing machine to store the oil, and the oil mainly plays a role in lubrication. If the engine oil is lower than the "base line", it will increase the wear of the mechanical structure and affect the stable operation of the machine. Therefore, when the sewing machine is working, it needs to be repaired and maintained at intervals to check whether the oil is lower than the "base line". If it is below or close to the baseline, oil needs to be added. However, under normal working conditions, due to the closed nature of the groove, it is impossible to observe whether the oil is lower than the baseline in real time, especially when working for a long time, once the oil is lower than the baseline, it will cause damage to the machine, and the losses will ac...

AI Technical Summary

Problems solved by technology

There are two disadvantages of this sensor: first, the medium between the two contacts needs to be conductive, but the oil of the sewing machine is non-conductive, and the conductive characteristics will have the risk of leakage; second, this The sensor needs 2 contacts, which affects the installation and positioning of the sensor, that is, the installation and positioning of the sensor is not flexible

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