On-line monitoring and diagnosis method of coaxial capacitive sensor and engine lubricating oil wear particles

Abstract

The invention relates to the field of engine lubricating oil monitoring, in particular to a coaxial capacitance sensor and an online monitoring and diagnosis method for engine lubricating oil abrasive particles. The coaxial capacitive sensor includes a sensor lubricating oil inlet and a sensor lubricating oil outlet; the sensor lubricating oil inlet and the sensor lubricating oil outlet communicate with the coaxial capacitive sensor respectively; the coaxial capacitive sensor is equipped with a central bearing, an electrode support insulating matrix and an electrode plate The interior of the coaxial capacitive sensor is divided into multiple detection subspaces by several electrode supporting insulating bases and the central bearing, and the electrode plates are respectively attached to the electrode supporting insulating bases. The coaxial capacitive sensor provided by the present invention can be arranged inside the lubricating oil pipeline, which avoids the influence of environmental factors on the test results, can efficiently detect the characteristics of lubricating oil abrasive particles online, and realizes online monitoring and diagnosis of lubricating oil abrasive particles in the entire watershed, reflecting The severity of the surface wear state of the friction pair of the rotating parts of the engine ensures the safe and reliable operation of the engine.

Description

technical field [0001] The invention relates to the field of aero-engine lubricating oil monitoring, in particular to a coaxial capacitance sensor and an online monitoring and diagnosis method for engine lubricating oil abrasive particles. Background technique [0002] Aeroengines are complex thermodynamic machines that work repeatedly under high temperature, high pressure, and high-speed rotation conditions for a long time. During actual operation, the contact surfaces of various parts will rub against each other, resulting in a large friction force and causing internal loss of the engine. [0003] At the same time, the large amount of heat generated due to friction will overheat the parts, causing the engine to not work normally and even damage the parts. At this time, lubricating oil is required to form an oil film on the surface of the parts in contact with each other to reduce friction. [0004] In addition to lubricating and cooling, lubricating oil is also a transpor...

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Problems solved by technology

Among them, the optical method can be further divided into scattering method, photometric method and direct imaging method. Generally, it needs to be closely combined with graphic image analysis technology. There are many types of detectable parameters, but it is easily affected by air bubbles and is suitable for low flow rates. Electromagnetic method and It can be further subdivided into magnetic induction type, resistance type, capacitive type, charge type and inductive type. The magnetic induction type is generally suitable for ferromagnetic wear particle monitoring, the inductive type can distinguish ferromagnetic and non-ferromagnetic particles, and the capacitive type cannot distinguish metal particles. and non-metallic abrasive particles; the energy method mainly uses the indirect influence of abrasive particles in lubricating oil on mechanical resonance, pressure, microwave and other energy forms to monitor the concentration and composition of abrasive particles, which is generally not suitable for monitoring the number and size of abrasive particles. Capacitive sensors are used to monitor lubricating oil abrasive particles online. Generally, the electrodes are arranged on the outer surface of the lubricating oil pipeline, so that the detection results are easily affected by environmental factors.

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