On-line oil liquid monitoring sensor based on permittivity measurement and system thereof

Abstract

The invention discloses an on-line oil monitoring sensor based on permittivity measurement and a system thereof. The sensor comprises a supporting base, three polar posts are fixed in a concave part at one end of the supporting base, a circuit board is arranged in a cavity at the other end of the supporting base, and the cavity is closed by a rear cover; the first polar post and the second polar post are taken as two poles to form a first capacitor, the third polar post and the second polar post are taken as two poles to form a second capacitor, the second polar post is taken a public pole, and the first capacitor and the second capacitor are connected in parallel to form a differential cylindrical capacitor; and the differential cylindrical capacitor is connected with a wiring terminal of a high-precision capacitance measurement module in the circuit board through a shielded conducting wire. The adoption of a monitoring system of the sensor can detect the small change of a capacitance value of a capacity transducer, thereby reversely educing the small change of the permittivity of oil fluid further to perform real-time monitoring to the pollution degree of the oil fluid.

Description

technical field [0001] The invention relates to a sensor and a monitoring system thereof, in particular to an on-line oil monitoring sensor and system based on dielectric constant measurement. Background technique [0002] Lubricating oil plays a very important role in the normal operation of complex mechanical equipment. Oil analysis technology is an important technology in mechanical equipment condition monitoring and fault diagnosis. An increase in the contamination level of the oil indicates that the equipment's operating condition and the performance of the lubricating oil will deteriorate. Especially when the oil contamination level increases rapidly, it means that the machine must be shut down or a catastrophic accident will occur. There are many methods for monitoring oil contamination degree. Online monitoring is the research hotspot of oil analysis technology in mechanical fault diagnosis in recent years. Major companies and research institutions at home and abroa...

AI Technical Summary

Problems solved by technology

However, this sensor cannot monitor the degree of oil pollution caused by metal and non-metal pollutants

The main reason is that for oil monitoring, the dielectric constant difference between water and oil is very large, so it is easier to distinguish; the dielectric constant difference between metal and non-metallic pollutants and oil is not as large as the difference between water and oil. Therefore, a higher sensitivity dielectric constant sensitive sensor and a higher precision sensing signal detection technology are needed to realize the online detection of oil pollution degree

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