Device for measuring the eccentric position of the aero-engine bearing holder

Abstract

The invention provides a device for measuring the eccentric position of the aero-engine bearing holder, which achieves the real time monitoring of the running state of an engine's main shaft through the measurement of the eccentric position of the engine bearing holder. In the implementation, a high temperature withstanding capacitance displacement sensor is mounted on the force bearing support plate of a casing through a rod body made from low expansion materials. When eccentric displacement occurs in the bearing holder, the output of the capacitance displacement sensor is made to change. This leads to the measurement of the eccentric displacement of the bearing holder. In an aero-engine, the rotor system, through the main shaft bearing, is supported and positioned; and the main shaft bearing is just fixedly arranged in the bearing holder of the casing. Therefore, the eccentric displacement of the bearing holder can destroy the coaxiality of the rotor system, and undermines the normal running of the engine. The device for measuring the eccentric position of engine bearing holder works with a simple principle, is very adaptive, and can be conveniently used. The device can also carry out precise measurement to the magnitude and the direction of the eccentric displacement of bearing holder in the vehicle testing process so as to avoid grave consequences caused by large eccentric displacement.

Description

technical field [0001] The invention relates to a device for measuring the eccentric displacement of an aeroengine bearing seat, which belongs to the technical field of measurement. Background technique [0002] In an aero-engine, the casing (3) is the main load-bearing component, and is usually composed of an outer wall, a bearing cavity (4) and several radial load-bearing support plates (6). Among them, the bearing seat (5) of the engine is installed in the bearing cavity (4), and the bearing cavity (4) is connected with the outer wall of the casing (3) through the bearing support plate (6) distributed symmetrically along the circumference. This constitutes a hub-and-spoke frame structure. The main shaft bearing of the engine rotor system is fixed in the bearing seat (5), so once the eccentric displacement occurs in the bearing seat (5) during the working process of the engine, the coaxiality of the rotor system will be destroyed, affecting the normal operation of the eng...

AI Technical Summary

Problems solved by technology

The temperature of the high-temperature gas in the gas channel can reach 500-700°C, and the heat will also be transferred to the bearing cavity through conduction, heat radiation, etc., resulting in a high ambient temperature of the bearing. Such a harsh working environment makes many conventional sensors and measurement methods cannot be applied

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