Inclined spiral groove sealing structure with hole cavities in blade tips and turbomachinery

A technology of sealing structure and spiral groove, applied in mechanical equipment, engine components, machines/engines, etc., can solve problems such as large mixing loss, increased equipment weight, and limited leakage reduction.
CN113389601AActive Publication Date: 2021-09-14JIANGSU UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
JIANGSU UNIV
Publication Date
2021-09-14

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Abstract

The invention provides an inclined spiral groove sealing structure with hole cavities in blade tips and turbomachinery. The inclined spiral groove sealing structure comprises a casing, a blade crown, moving blades and spiral grooves, wherein an annular blade crown is arranged at the tops of the moving blades, and the casing is located above the blade crown; the plurality of spiral grooves are formed in the radial outer circumference of the blade crown or the inner wall of the casing, and a plurality of cavities are formed in the tops of the spiral grooves in the length direction; an included angle is formed between each spiral groove and the rotating circumferential direction of the corresponding moving blade, and the included angle is a helix angle alpha; an included angle is also formed between each spiral groove and the axial direction of the corresponding moving blade, the included angle is an inclination angle beta, and the spiral grooves are obliquely arranged towards the upstream leakage inflow port side; and the spiral grooves are located between the top of the blade crown and the inner wall face of the casing. The advantages of spiral sealing, honeycomb sealing and inclined tooth grooves are comprehensively utilized, and the tip clearance leakage amount and leakage loss are reduced through the pumping effect, the turbulent flow effect and the throttling effect.
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Description

technical field

[0001] The invention belongs to the technical field of impeller machinery, and in particular relates to an inclined spiral groove sealing structure with a cavity on the tip of a blade and an impeller machinery. Background technique

[0002] At present, in the turbomachinery such as blower, compressor, steam turbine, gas turbine, and aeroengine, which are widely used in electric power and various power equipment, there is a problem of blade tip clearance leakage. The reason is that the top of the rotating blade (that is, the moving blade) There is an unavoidable gap between the blade tip and the casing, and the leakage of the working fluid at the blade tip gap will reduce the energy conversion efficiency of the turbomachinery, increase the disturbance of the fluid to the blade tip, cause energy loss, and endanger the operation safety of the turbomachinery. In order to enhance the sealing effect, a crown or shroud can be installed on the top of the blade, and v...

Claims

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