High-flow-rate ultra-large-diameter semi-milling and semi-welding closed ternary impeller and manufacturing method

Abstract

The invention provides a high-flow-rate ultra-large-diameter semi-milling and semi-welding closed ternary impeller and a manufacturing method. The closed ternary impeller mainly comprises a wheel cover, a wheel disc and a blade, wherein the blade is uniformly divided into two halves, one half of blade is integrally milled and formed with the wheel cover, the other half of blade is integrally milled and formed with the wheel disc, in addition, the two halves of blades are welded at a butt joint part for forming an integral blade, a groove is formed in the butt joint part of the two halves of blades, and in addition, a welding seam is formed in the middle of the whole blade after the welding. The manufacturing method comprises the following steps that the blade of the ternary impeller is uniformly divided into two parts, one half of blade is integrally milled into the wheel disc, one half of blade is integrally milled into the wheel cover, the groove is formed in the butt joint part of the two halves of the blades, in addition, the whole blade is welded after the fixation by a tooling, and the welding seam is formed in the middle of the whole blade; after the welding of the wheel cover and the wheel disc of the impeller is completed, the stress is eliminated, and the outer contour of the impeller is finely turned in the turning processing center of a numerical control machine tool after the re-installing and re-clamping; finally, the welding part of the blade is manually ground to be smooth. The ternary impeller and the manufacturing method have the characteristics that better pneumatic performance and pneumatic efficiency are realized, the processing quality is good, the impeller intensity is high, and the like.

Description

Technical field [0001] The invention relates to a large-flow, super-large-diameter, semi-milled and semi-welded closed ternary impeller and a manufacturing method thereof, and belongs to the technical field of centrifugal compressor impellers and manufacturing. Background technique [0002] The large-flow, super-large diameter, semi-milled and semi-welded closed ternary impeller is the work component of the centrifugal compressor. The characteristics of the impeller are: large blade distortion, large curvature of the disc surface and cover disc rotation surface, and the flow path deviation affects the aerodynamic performance of the impeller Greater impact. A closed impeller generally includes three parts: a wheel cover, a wheel disc and a blade. A closed ternary impeller with a small flow rate and a small diameter can be integrally milled or the blades are integrally milled on the wheel disc or wheel cover, and then the two parts are passed through Electric welding, brazing, riv...

AI Technical Summary

Problems solved by technology

The closed impeller generally includes three parts: the wheel cover, the wheel disc and the blade. The closed three-dimensional impeller with small flow rate and small diameter can be milled as a whole or the blade is milled on the wheel disc or the wheel cover as a whole, and then the two parts are passed through Electric welding, brazing, riveting or combined methods are used for connection, and the closed three-dimensional impeller with large flow and super large diameter has been connected by three-part welding due to the considerable degree of blade distortion. The accuracy of the flow path cannot be guaranteed, which more or less affects the aerodynamic performance of the impeller, which is a bottleneck to improve the efficiency of this type of impeller

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