Novel rotor structure for hole-pattern seal

Abstract

The invention discloses a novel rotor structure for hole-pattern seal. The novel rotor structure comprises a sealing sleeve, a sealing body, hole-pattern strips, a plurality of sets of annular concave arc wedge-shaped bosses and a rotor. The sealing body is installed on the sealing sleeve. The hole-pattern strips are arranged on the sealing body in the circumferential direction, and each hole-pattern strip is composed of a plurality of round holes. The rotor is located in an annular cavity formed by the hole-pattern strips. The annular concave arc wedge-shaped bosses are arranged on the circumferential surface of the rotor in the radial direction. The included angle theta 1 between the arc surface of each annular concave arc wedge-shaped boss and the surface of the rotor ranges from 5 degrees to 45 degrees. The included angle theta 2 between the arc surface of each annular concave arc wedge-shaped boss and the vertical surface of the boss ranges from 5 degrees to 45 degrees. The radial height h of each arc surface of each annular concave arc wedge-shaped boss is 0.2-0.6 time a sealing diameter gap (R-r). The radial interval 1 between every two adjacent arc surface of each annular concave arc wedge-shaped bosses is 0.5-3 times the edge distances between each pair of hole patterns. According to the novel rotor structure for hole-pattern seal, separation of a boundary layer of jet fluid in the hole-pattern sealing gap can be promoted so that the energy dissipation function of the round hole can be brought into full play. Meanwhile, the flow resistance of the jet fluid in the sealing gap is increased through the wedge-shaped boss structures, and the pass-through effect causing sealing leak is reduced.

Description

technical field [0001] The invention relates to a dynamic sealing structure in a rotating machine, in particular to a novel hole-type sealing rotor structure. Background technique [0002] Hole seals are key components of rotating machinery such as aero-engines, steam turbines, and compressors. Compared with the traditional labyrinth seal, the perforated seal not only has better sealing characteristics, but also has better rotor dynamics characteristics. The hole type seal allows application under the condition of high pressure difference without increasing the size of the seal, and has high safety and reliability. Therefore, hole seals are widely used in rotating machinery in aerospace, electric power, petrochemical and other industries. [0003] The hole seal is mainly composed of a sealing sleeve, a sealing body, a hole belt and a rotor, and the hole belt is composed of several round holes. The flow field characteristics and sealing mechanism of the hole seal are as fo...

AI Technical Summary

Problems solved by technology

Therefore, the smooth rotor leads to insufficient energy dissipation of the round hole, and the vortex formed in the hole is weak, which greatly reduces the energy dissipation of the hole seal and directly affects the sealing and damping effect of the hole seal.

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