An oil metal particle detection device

Abstract

The invention discloses an oil metal particle detection device comprising a detection unit and a first compensation unit. The detection unit comprises an excitation signal source, a detection coil, two excitation coils and a resonant matching capacitor. The excitation signal source is connected with the two excitation coils and the first compensation unit so as to provide excitation voltage to thetwo excitation coils and the first compensation unit. The two excitation coils are arranged on the two sides of the detection coil and have opposite winding directions. The detection coil is connected with the first compensation unit through the resonant matching capacitor and wound on the oil pipeline so that the metal particles can be detected according to the output voltage of the detection coil when the oil penetrates through the detection oil. The first compensation unit is suitable for receiving the excitation voltage from the excitation signal source and outputting the first compensation voltage so as to counteract the residual voltage of the detection coil.

Description

technical field [0001] The invention relates to the technical field of equipment state monitoring, in particular to an oil metal particle detection device. Background technique [0002] Today's mechanical equipment often has the characteristics of high precision and high speed, but this will bring the hazards of accelerated wear. Mechanical wear produces metal particles in the lubricating oil. Therefore, the detection of metal particles in oil is very important. It can effectively detect the wear state of equipment in real time and reflect the change process of equipment wear, so as to replace oil or replace related parts in time to prevent failures. [0003] At present, there are two detection methods for oil metal particles, namely offline and online. Among them, the offline detection has the following disadvantages: 1. The detection period is long, and oil samples need to be taken regularly manually; 2. The detection cost is high, and the detection data lags behind, whi...

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Problems solved by technology

Among them, the offline detection has the following disadvantages: 1. The detection period is long, and oil samples need to be manually taken regularly; 2. The detection cost is high, and the detection data lags behind, which cannot meet the timeliness requirements

[0005] However, in actual use, it is impossible to wind two excitation coils with the same parameters. The actual two excitation coils are asymmetrical and unbalanced. This unbalance of the excitation coils will cause the residual voltage output by the detection coil to be non-zero.

However, if the residual voltage is too large, the particle signal will be submerged, which will affect the detection sensitivity and stability, and even lead to the inability to detect metal particles.

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