Self-pumping hydrodynamic pressure fingertip sealing device

Abstract

The invention provides a self-pumping hydrodynamic pressure fingertip sealing device which has hydrodynamic pressure and sealing ability in a running state and has the low leakage rate in a stopped state, so as to overcome the deficiency of the high leakage rate or the great abrasion loss caused by the fingertip sealing retardation effect and poor rotor precession adaptability. The self-pumping hydrodynamic pressure fingertip sealing device consists of a rear baffle, a low-pressure fingertip sealing sheet, a high-pressure fingertip beam with a fingertip boot, and a rotor; the high-pressure fingertip beam with the fingertip boot, the low-pressure fingertip sealing sheet and the rear baffle are stacked from high pressure to low pressure side sequentially and are connected through rivets so as to form a ring which sleeves the rotor; the fingertip boot and the rotor form a sealing interface; a drainage hole and an internal ring groove are formed in the fingertip boot; a spiral groove is formed in the surface part of the rotor; the drainage hole communicates with the internal ring groove; the spiral groove and the internal ring groove are opposite in the radial direction; and when the rotor rotates, a fluid on the high pressure side is pumped to the sealing interface via the drainage hole, the internal ring groove and the spiral groove so as to form hydrodynamic pressure to push the fingertip boot away, thereby avoiding frictional wear between a fingertip and the rotor.

Description

technical field [0001] This patent belongs to the field of sealing technology, and particularly relates to a fingertip seal with fluid self-circulation dynamic pressure effect, which is suitable for high-speed, nutating axial displacement and precessing radial displacement, and gases with high working life requirements. Medium sealing occasions. Background technique [0002] Sealing technology plays a very important role in gas turbines and aero engines. Advanced sealing technology can effectively reduce the fuel consumption rate and flight cost of the engine while improving the performance and life of the engine. The main types of seals currently used in aero-engines are grate seals, brush seals, and graphite floating ring seals. With the continuous improvement of the performance of aero-engines, traditional sealing methods, such as grate seals, have been difficult to meet its multiple requirements in terms of work efficiency, thrust-to-weight ratio, fuel consumption, rel...

AI Technical Summary

Problems solved by technology

[0006] The purpose of this technology is to provide a self-pumping hydrodynamic pressure fingertip seal device with hydrodynamic pressure and sealing ability in the running state, and a small or even no leakage in the shutdown state, so as to overcome the current gas turbine or aeroengine fingertip seal. "Hysteresis effect" and poor adaptability of rotor precession lead to high leakage rate or large amount of wear

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