Labyrinth seal structure with brush type seal strips

Abstract

The invention discloses a labyrinth seal structure with brush type seal strips. The labyrinth seal structure comprises a labyrinth seal and the brush type seal strips. The labyrinth seal is used for being mounted in the circumferential direction of a rotor in a sleeving manner, and a clearance is left between the labyrinth seal and a rotor. The labyrinth seal comprises a seal body and labyrinth teeth arranged on the inner side of the seal body. The brush type seal strips are assembled in an axial through groove in the axial direction, wherein the axial through groove is formed in the inner side of the labyrinth seal, the brush type seal strips penetrate the seal body in the axial direction, and the at least four brush type seal strips are arranged in the circumferential direction of the labyrinth seal. According to the labyrinth seal structure, according to a turbo machine rotor system, the labyrinth seal structure with the brush type seal strips is provided for the requirements for reducing forward rotational flow of a seal chamber, improving the seal rotor power characteristic, improving rotor stability and reducing the seal leakage amount; the forward rotational flow of the sealchamber can be effectively reduced, effective damping of a traditional labyrinth seal can be increased, and the seal leakage mount can be reduced; and therefore the problem of rotor vibration unstability is solved, and the stability and sealing performance of the rotor system are improved.

Description

technical field [0001] The invention belongs to the technical field of rotary mechanical seals, and in particular relates to a labyrinth seal structure in which a brush-type seal strip with functions of anti-rotation and vibration suppression is assembled in the circumferential direction. Background technique [0002] In impeller machinery such as steam turbines, gas turbines, pumps and compressors, the rotary seal is installed between the rotating part and the stationary part to control the leakage flow from the high pressure area to the low pressure area through the dynamic and static gap, which has a significant impact on the operating efficiency of the impeller machinery . In the prior art, the labyrinth seal has a simple structure, low cost, and is convenient for engineering application, and is the most common seal form in the field of turbomachinery. [0003] While controlling the leakage flow, the rotary seal will also generate unsteady fluid excitation force, which ...

AI Technical Summary

Problems solved by technology

[0004] like Figure 1c As shown, in engineering applications, the circumferential speed of airflow can be reduced by adding traditional circumferential baffles in the traditional labyrinth seal, thereby reducing the vibration amplitude of the rotor. However, in order to prevent friction with the rotor, all stator parts and rotor diameter The gap in the direction is relatively large, which cannot well eliminate the circumferential swirl velocity caused by the high-speed rotation of the rotor near the rotor surface.

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