A ribbed non-contact fingertip seal

Abstract

A non-contact fingertip sealing device with a fin comprises a non-contact fingertip sealing device part matched with a rotor, wherein the non-contact fingertip sealing device part is formed by sequentially connecting a front baffle, a rear baffle, a high-pressure fingertip sheet and a low-pressure fingertip sheet with a fingertip boot structure; the fin that is arranged in a T shaped manner together with a low-pressure side surface of a fingertip beam and the fingertip boot structure is arranged on the low-pressure fingertip sheet; the fin and a low-pressure fingertip boot utilize hydrodynamic pressure and hydrostatic pressure effects; a lifting force is generated by the action of a front and rear pressure difference and rotation of the rotor to lift the fingertip sheets off the surface of the rotor, so as to achieve sealing and no contact with the rotor; when the rotor has radial displacement, the structure can more effectively and automatically adjust gestures of the fingertip sheets; the motion of the fingertip sheets adapts to radial runout of the rotor; a sealing effect is ensured and a non-contact state is kept at the same time; an effect of reducing and even eliminating the conventional non-contact fingertip sealing 'lag effect' is exerted; and the dynamic sealability of non-contact fingertip sealing is improved.

Description

technical field [0001] The invention belongs to a non-contact sealing device for a rotating shaft, in particular to a non-contact fingertip sealing device with ribs. Background technique [0002] In turbomachinery, especially in aero-engines, it is often necessary to seal the fluid between the rotating part and the stationary part to reduce the leakage of working fluid and improve its working efficiency. Non-contact fingertip seal is a new type of rotor sealing technology, which has been researched by NASA as the next generation aeroengine sealing technology. This new type of seal can use the static pressure and dynamic pressure of the sealing fluid to realize the non-contact between the seal and the rotor, and achieve high life while ensuring low leakage. It is worth noting that when the rotor is radially displaced and deviates from its original position, it is hoped that the dynamic response of the fingertip sheet to the rotor deflection can be realized through the dynami...

AI Technical Summary

Problems solved by technology

However, due to the friction between the fingertip sheet and the rear baffle, when the rotor radially displaces, the fingertip sheet is pushed away from the initial position, and when the radial displacement of the rotor returns, the fingertip sheet is difficult to Return to the original position, thereby increasing the sealing gap, resulting in a decrease in sealing performance

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