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윤경선 ( Kyeongseon Yoon ),유준상 ( Joonsang Yoo ),전온겸 ( Ongyeom Jeon ),주진원 ( Jinwon Joo ) 충북대학교 산업과학기술연구소 2023 산업과학기술연구 논문집 Vol.37 No.2
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.