High-reliability high-temperature-resistant and high-pressure-resistant dynamic sealing structure

Abstract

The invention discloses a high-reliability high-temperature-resistant and high-pressure-resistant dynamic sealing structure, and relates to the technical field of aero-engine air control systems. One end of the dynamic sealing outer shell is a working gas inlet, and the other end of the dynamic sealing outer shell is a working gas outlet; the piston cavity is arranged in the movable sealing outer shell; the driving piston part slides in the piston cavity and drives the acting end valve part to synchronously move outside the piston cavity; the compression spring is arranged in the piston cavity and pushes the driving piston part to move so as to drive the acting end valve part to move in the direction of opening the working gas inlet; the control gas inlet is formed in the movable sealing outer shell and communicates with the piston cavity.

Description

technical field [0001] The invention relates to the technical field of aero-engine air control systems, in particular to a dynamic sealing structure with high reliability and high temperature and high pressure resistance. Background technique [0002] Surge is a harmful and unstable working state of the compressor. When the blades of the engine compressor rotate at high speed, the air will be inhaled and compressed. When the volume of the gas becomes smaller, it will have the internal energy of expansion, which will impact the blades of the compressor and cause it to vibrate. If the compressor surge is light, the engine power and economy will be reduced. In severe cases, it may cause mechanical damage to the engine or flameout or shutdown of the combustion chamber. In order to prevent the compressor from surging and ensure the stable and reliable operation of the compressor, at low speed, the bleed valve opens and the bleed valve deflates to prevent engine surge, so the dyn...

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Problems solved by technology

There is also a metal-coated sealing structure, which has a large friction force, and will generate greater resistance to the opening and closing of the valve of the high-pressure deflation valve product, which cannot meet the requirements of the product.

[0003] With the iterative development of my country's weapons and equipment, the power of aeroengines has also increased, so the temperature and pressure of the control gas and working gas of the bleed valve have also increased a lot, and the leakage requirements of the working gas have become more stringent. The combination of traditional dynamic sealing structure and flap valve cannot meet the requirements of high temperature, high pressure and low leakage of the product

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