High-reliability zero-leakage steam turbine shaft end sealing method

Abstract

The invention provides a high-reliability zero-leakage steam turbine shaft end sealing method. The high-reliability zero-leakage steam turbine shaft end sealing method is used for sealing a gap between a shell and a rotating shaft of a steam turbine; a high-pressure medium fluid cavity is formed in the shell of the steam turbine, and a low-pressure atmosphere side is arranged outside the shell of the steam turbine; a first-stage seal, a second-stage seal, a third-stage seal and a fourth-stage seal are sequentially arranged from the high-pressure medium fluid cavity to the low-pressure atmosphere side; the high-pressure medium fluid cavity is divided into a first-stage cavity body, a second-stage cavity body, a third-stage cavity body and a fourth-stage cavity body through the first-stage seal, the second-stage seal, the third-stage seal and the fourth-stage seal; the first-stage seal comprises a first flexible static ring and a first movable ring; the second-stage seal comprises a second flexible static ring and a second movable ring; the third-stage seal comprises a third static ring and a third movable ring; and the fourth-stage seal comprises a fourth static ring and a fourth movable ring. Friction parts are arranged at the outer ends of the flexible static rings, pressure cavities are formed in the flexible static rings, and the pressure cavities of the flexible static rings expand so that the flexible static rings can make contact with the corresponding movable rings through the friction parts for sealing.

Description

technical field [0001] The invention belongs to the technical field of mechanical seals, in particular to a high-reliability zero-leakage steam turbine shaft end sealing method. 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 are compressed by ...

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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