Can Kang This email address is being protected from spambots. You need JavaScript enabled to view it.1, Yongchao Zhang1 , Yilin Xiong2 and Qing Li1

1 School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, P.R. China
2 KSB Shanghai Pump Co., Ltd., Shanghai 200245, P.R. China


Received: April 11, 2018
Accepted: June 30, 2018
Publication Date: December 1, 2018

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Emphasis was placed on the vibration of a horizontally installed two-stage condensate pump. The vibration was caused by resonance, which was confirmed through a vibration test, and the resonance frequency was acquired. The source of vibration was sought from both flow and structural aspects. Computational fluid dynamics technique was used to calculate typical frequencies excited by flows in the pump. Finite element analysis was executed to locate the structural factors that might contribute to the resonance and to enable a modal analysis of the pump base. The test results demonstrate that the resonance frequencies are slightly less than 100 Hz. Nevertheless, the flow-induced dominant frequencies deviate considerably from the resonance frequencies. Regarding the motor, it is featured by a dominant frequency of 100 Hz under the no-load condition; therefore, the primary reason of the pump unit resonance is manifested. Two strategies of reconstructing the pump base were attempted to eliminate resonance. Through adding reinforcing ribs to the supporting frame under the motor, the natural frequencies of the pump base associated with the second- and third-order modes increase relative to their counterparts of the original scheme. The effect of such a strategy was validated by test results. The other strategy is secondary grouting, with which the resonance frequency was avoided and the stiffness of the pump base was elevated remarkably.

Keywords: Condensate Pump, Resonance, Pump Base, Vibration Test, Simulation, Modal Analysis


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