Coupling elastic-support type oil film damper bearing system for gas turbine

Abstract

The invention belongs to the technical field of gas turbine equipment, in particular to a coupling elastic-support type oil film damper bearing system for a gas turbine. The coupling elastic-support type oil film damper bearing system comprises a mouse cage bearing seat, a damper housing, a sleeve, an elastic ring, a locknut, a ball bearing, sealing rings and an oil injection ring; the elastic ring is installed and clamped between the damper housing and the sleeve; the two ends of the elastic ring are each equipped with the sealing ring for controlling oil drainage of the corresponding end part; a flange end of the mouse cage bearing seat and a flange end of the damper housing are fixedly connected with a stator case of the gas turbine by virtue of bolts which are uniformly distributed inthe circumferential direction; the ball bearing for supporting a rotor and a shaft neck is installed inside a cantilever end of the mouse cage bearing seat; the locknut is used for twisting and fixingthe axial positions of the sleeve and the ball bearing; and the sleeve is matched with the cantilever end of the mouse cage bearing seat in a contacting manner. The coupling elastic-support type oilfilm damper bearing system provided by the invention improves the stability of the oil film damper so that a rotor-support system of the gas turbine can steadily get through the critical speed of rotation in each stage and stably runs under a main working state.

Description

Technical field: [0001] The invention belongs to the technical field of gas turbine equipment, and in particular relates to a bearing system for a coupled spring oil film damper for a gas turbine. Background technique: [0002] Squeeze oil film damper is a new technology developed in the 1960s. Due to its remarkable vibration reduction effect, simple structure, small footprint and relatively easy manufacture, it received great attention in the 1980s and was first used on aero-engines. It has been applied and has become a typical design for reducing the vibration of ships and industrial gas turbines, improving stability and prolonging life. When the rotor-support system passes through and approaches the critical speed, its amplitude is positively related to the unbalance and the critical angular velocity of the rotor, and inversely related to the damping coefficient of the rotor-support system. In the case that the overall structure design of the engine has been determined, ...

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Problems solved by technology

[0003] The traditional squeeze oil film damper shows strong nonlinearity when the static eccentricity is large and the transient impact of a large load is applied, which makes the system appear bistable, non-coordinated precession and other nonlinear behaviors, thus endangering the rotor system. stable operation of

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