关键词: 叶轮, 强度, 变形, 优化

Abstract: Without altering the parameters of the closed-type impeller blades, the fillets between the blades and the disc, or the wheel cover, the study investigated the effects of changing the thickness of the impeller disc and cover, as well as the diameter of the impeller's fixed end face, on the strength, deformation, and first-order critical speed of the impeller. By utilizing control variables and the finite element analysis method, it is concluded that: the increase in the thickness of the wheel cover reduces the strength of the impeller; The increase or decrease in the thickness of the outer diameter side of the wheel cover and the balance ring of the wheel disc reduces the deformation of the impeller; The reduction in thickness of the wheel cover, the reduction in thickness of the portion above 2/3 of the outer diameter of the wheel disc, the increase in thickness of the portion below 2/3 of the outer diameter of the wheel disc, the increase in outer diameter of the contact surface between the impeller and the shaft shoulder, and the increase in outer diameter of the fastening surface at the end of the impeller inlet all enhance the first-order critical speed under high-frequency excitation. Based on the above conclusions, combined with the castability, installation process, and lightweight of the impeller, optimize the impeller of a key project to meet the design criteria. The research results can provide a foundation for the subsequent optimization design of the impeller structure, improve the efficiency of impeller design, and shorten the design cycle of the impeller.

Key words: Impeller, Strength, Deformation, Optimization