A ribbed non-contact fingertip seal

Abstract

A kind of non-contact type finger seal rib comprising a non-contact type finger cooperating sealing means and the rotor, the non-contact finger by a longitudinal baffle seal means, and a sheet having a high pressure fingertip fingertip shoe structures low pressure pieces are connected to each finger, with a low-voltage side surface of the fingertip and finger beams shoe structures were "T" shaped ribs disposed on the low voltage fingertip sheet; together with the ribs by the fluid and a low pressure shoe fingertip hydrostatic pressure and dynamic pressure effect, the lifting force generated at the differential pressure and effect rotation of the rotor, the finger lifted off the surface of the rotor plate, in order to achieve non-contact seal with the rotor; radial displacement occurs in the rotor, the structure It can be automatically adjusted more effectively fingertip sheet posture, so that movement of the finger plate adapted radial runout of the rotor, maintaining non-contact state, while ensuring the sealing effect, serves to reduce or even eliminate the conventional non-contact seal finger "hysteresis effect" role in enhancing the sealing properties of the non-contact dynamic sealing finger.

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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