다단 펌프 로터 축의 구조시험 및 굽힘 변형률 측정 = Structural Test and Bending Strain Measurement of Multi-stage Pump Rotor Shaft

다국어 초록 (Multilingual Abstract)

Multistage centrifugal pumps, known for their high efficiency and capacity to handle high lift and flow requirements, find extensive application across various industries such as chemicals, electric power, construction, and fire protection. In this paper, to evaluate the safety of the centrifugal pump rotor shaft, a structural test was performed to measure the bending strain due to its own weight of the rotor shaft with the impeller assembled. For this purpose, strain gages were attached at 26 points and a strain measurement test was performed while applying a load due to the impeller's dead weight. As a result of the static test, the largest bending stress in the entire rotor shaft was measured to be 17.2 MPa. Considering the shaft material's yield stress of approximately 550 MPa, a safety factor of over 30 was determined. Furthermore, considering the dynamic fatigue conditions, where the applied fatigue limit is 6 to 8 times smaller than the yield stress, the rotor shaft structure was assessed to maintain its safety, even under these conditions.