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

Abstract

The invention provides a multi-end-face self-regulation starting steam turbine shaft end sealing device. The multi-end-face self-regulation starting steam turbine shaft end sealing device comprises a shell, a rotating shaft, a movable ring base and a pressure regulator; a medium fluid cavity is formed between the shell and the rotating shaft; the shell comprises a machine shell and a static ring base; the static ring base is provided with a first flexible static ring, a second flexible static ring and a third flexible static ring which are coaxial with the rotating shaft; the diameter of the first flexible static ring, the diameter of the second flexible static ring and the diameter of the third flexible static ring are sequentially reduced; the rotating shaft is fixedly sleeved with the movable ring base; the movable ring base is fixedly provided with a first movable ring, a second movable ring and a third movable ring which correspond to the first flexible static ring, the second flexible static ring and the third flexible static ring; each flexible static ring comprises a friction part and a pressure cavity, wherein the friction part and the corresponding movable ring are in contact sealing; and a first pressure regulating cavity, a second pressure regulating cavity and a third pressure regulating cavity are formed in the pressure regulator. The shaft end sealing device has high reliability, self-regulation sealing can be achieved, torque is low, power losses are small, and sealing performance is good.

Description

technical field [0001] The invention belongs to the technical field of mechanical seals, and in particular relates to a steam turbine shaft end sealing device capable of 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...

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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