A hole-type sealing structure capable of enhancing sealing performance

Abstract

The invention discloses a novel hole-type sealing structure capable of enhancing sealing performance, which comprises several spherical concave cavities (3), circumferentially inclined cavities (5) or axial cavity cavities (3) opened in the circumferential direction of the inner wall of a sealing stator part (1). To the inclined cavity (6), the sealed stator part (1) is used in conjunction with the sealed rotating part (4), so that the turbulent vortex structure in the chamber changes, the vortex intensity increases, and the turbulent dissipation effect is improved; at the same time, the The thickness of the wall between the cavities is increased, and the pressure bearing performance of the seal is enhanced. The spherical concave hole seal of the invention enhances the eddy current strength in the cavity and improves the sealing performance; under the same porosity, the wall thickness between the cavities is increased, and the pressure bearing performance of the seal is improved. The axial or circumferential oblique hole seal of the present invention enhances the eddy current strength in the cavity, limits the development of circumferential swirl flow in the sealing gap, and improves the dynamic characteristics of the sealed rotor.

Description

technical field [0001] The invention belongs to the technical field of impeller machinery, and in particular relates to a novel hole-type sealing structure capable of enhancing sealing performance. Background technique [0002] Rotary sealing devices are widely used in steam turbines, gas turbines, petrochemical compressors, pumps and other impeller machinery in the power generation industry. As one of the important components of the turbomachinery, the rotary sealing device is usually installed in the gap between the moving and static parts such as the shaft end and the tip clearance, and improves the efficiency of the turbomachinery by controlling the leakage flow of the working medium from the high-pressure end to the low-pressure end at the gap. In addition, the sealing device in the turbomachinery, while controlling the leakage flow, will also interact with the working fluid to generate fluid excitation force, which will affect the stability of the rotor bearing system....

AI Technical Summary

Problems solved by technology

[0006] In order to improve the sealing performance of a typical hole seal, as many cavities as possible are arranged on the inner wall of the stator part, resulting in a smaller wall thickness between the cavities on the stator part, greatly reducing the pressure bearing capacity of the seal, which greatly limits its pressure in the high-pressure liquid state. Application in working fluid environment

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