A gas turbine engine self-pressurization sealing pressure oil return bearing cavity

Abstract

The invention belongs to the technical field of aero-engine manufacturing, and in particular relates to a gas turbine engine self-pressurized and sealed pressure oil return bearing chamber, which includes a main shaft and a cylindrical bearing bracket. The end of the bearing bracket is provided with an end cover, and the inner ring surface of the end cover An annular air gap is formed at intervals from the outer ring surface of the main shaft, and a movable sealing ring is provided on the flow section of the annular air gap. In the present invention, a movable sealing ring is arranged in the annular air gap. When the air pressure in the high-pressure air duct is lower than the preset pressure, the movable sealing ring can seal the annular air gap, preventing the lubricant from seeping out from the annular air gap at low speed. When the air pressure in the high-pressure air duct is greater than or equal to the preset pressure, the movable sealing ring can open the annular air gap. At this time, the movable sealing ring is separated from the main shaft, which effectively reduces the wear speed of the sealing ring at high speeds, improves the service life of the sealing ring, and reduces Spindle rotational resistance.

Description

technical field [0001] The invention belongs to the technical field of aero-engine manufacturing, and in particular relates to a gas turbine engine self-supercharging and sealing pressure oil return bearing cavity. Background technique [0002] The aero-engine is mainly composed of a main shaft, a compressor, a turbine, a casing, a fuel system, and a lubricating oil system. A high-pressure air passage is formed between the engine and the turbine, and the nozzle and ignition mechanism of the fuel system are generally located in this air passage, and the bearing support mechanism of the main shaft is also generally installed in this position. During high-speed operation, the engine needs to continuously supply lubricating oil to the bearing cavity to ensure the normal operation of the bearing. In order to prevent the leakage of lubricating oil, a sealing device needs to be installed at the end of the bearing cavity. The existing technology generally uses a sliding sealing ring...

AI Technical Summary

Problems solved by technology

During high-speed operation, the engine needs to continuously supply lubricating oil to the bearing cavity to ensure the normal operation of the bearing. In order to prevent the leakage of lubricating oil, a sealing device needs to be installed at the end of the bearing cavity. The existing technology generally uses a sliding sealing ring for sealing. Strict, there is relative friction between the sealing ring and the main shaft, which increases the rotational resistance of the main shaft on the one hand, and on the other hand, the high-speed rotation of the main shaft makes the sealing ring wear faster and the service life is low

The existing technology also proposes a wind pressure sealing mechanism, which introduces the high-pressure airflow in the high-pressure air duct into the gap between the bearing cavity and the main shaft to form a high-pressure air gap, so as to achieve the purpose of sealing. This sealing method When the engine is running normally, it can achieve a good sealing effect, but when the engine is started or stopped, the wind pressure in the high-pressure air duct may be lower than the wind pressure required for sealing, and the lubricating oil may still flow from the air gap seepage

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