Multi-end-face self-regulation starting steam turbine shaft end sealing method

Abstract

The invention provides a multi-end-face self-regulation starting steam turbine shaft end sealing method. High-pressure medium fluid of a first-stage cavity passes through a first pressure adjusting cavity, the first pressure adjusting cavity releases fluid pressure to enter a pressure cavity of a first flexible static ring, the pressure cavity of the first flexible static ring expands, and the first flexible static ring and a first movable ring are pressed to form a first-stage friction pair for sealing; a second-stage seal of a second flexible static ring and a second movable ring is not started at the beginning, only when fluid leakage happens to a second-stage cavity to generate pressure, leaked fluid passes through a second pressure adjusting cavity, the second pressure adjusting cavity releases fluid pressure to enter a pressure cavity of the second flexible static ring, and the second flexible static ring and the second movable ring are pressed to form a second-stage friction pair for sealing; and a third-stage seal of a third flexible static ring and a third movable ring is not started at the beginning, only when fluid leakage happens to a third-stage cavity to generate pressure, leaked fluid passes through a third pressure adjusting cavity, the third pressure adjusting cavity releases fluid pressure to enter a pressure cavity of the third flexible static ring, and the third flexible static ring and the third movable ring are pressed to form a third-stage friction pair for sealing.

Description

technical field [0001] The invention belongs to the technical field of mechanical seals, in particular to a steam turbine shaft end sealing method with multi-face self-regulation and activation. Background technique [0002] Relatively rotating sealed fluid equipment such as steam turbines and centrifugal compressors include rotors and stators. The stators are generally shells. The rotors and shells rotate and remain stationary. The shell is equipped with a medium fluid. The rotating and stationary parts need to be sealed to ensure that the cavity The fluid pressure inside, the common sealing method of the shaft end is mechanical seal (mechanical end face seal). The mechanical seal device includes a moving ring and a static ring. The moving ring is fixedly installed on the shaft sleeve or shaft, and rotates with the shaft. The static ring is installed on the static ring seat, and the static ring seat is installed on the equipment shell. The static ring and the moving ring a...

AI Technical Summary

Problems solved by technology

The leakage of the medium fluid of rotating equipment often occurs at the end face gap between the static ring and the moving ring; in addition, due to the wear of the moving ring and the static ring, the seal will fail

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