The noise of AC motor cooling fan may be decreased effectively by employing a water-coo-ling system compared with a usual air-cooling system. In this paper a kind of water-cooling device is designed to simulate the cooling water circulation process in an AC motor. The noise levels of the centrifugal pump with cooling fan and with water-cooling device are measured at various flow rates, respectively. Furthermore, the pump hydraulic and suction performances are tested for the devices with 6 mm and 10 mm diameter discharge nozzles and compared with the corresponding performances of the original pump. It is shown that the noise level of the original pump is reduced at least by 8.70 dB. The device with 6 mm diameter discharge nozzle can take away the heat generated by the AC motor and is subject to a little influence upon the hydraulic and suction performances. Interestingly, that device can raise the pump head at a low flow rate. Even though the device with 10 mm diameter discharge nozzle can improve the head over the 0-15 m3/h flow rate range, particularly the head is increased by 0.30 m at the shut-off condition, unfortunately, both the hydraulic and suction performances are degraded notably by the device, especially at a high flow rate. The increased leakage or volumetric loss in the pump caused from the enlarged nozzle diameter is responsible for the performance degradation.
LU Jia-Xing,YUAN Shou-Qi,YUAN Jian-Ping et al. Experiments on effects of AC motor water-cooling device on performance of centrifugal pump[J]. Journal of Drainage and Irrigation Machinery Engin, 2014, 32(9): 737-741.
Long Xinping,Wang Fengjing,Guan Yunsheng. Experimental study on reduction of cavitation induced vibration and noise of jet pump by air supply method [J]. Journal of Vibration and Shock,2008,27(10):32-36.(in Chinese)
Gao Xinmin,Chen Bing,Lü Jinggao,et al. Analysis on reducing vibration and Noise of centrifugal pump using in ships [J]. Fluid Machinery,2011,39(9):50-53.(in Chinese)
Si Qiaorui,Yuan Shouqi,Yuan Jianping. Study on the influence of volute to flow-induced noise in centrifugal pump [J]. Advanced Materials Research,2012,516/517:1009-1017.
Jiang Y Y,Yoshimura S,Imai R,et al. Quantitative eva-luation of flow-induced structural vibration and noise in turbomachinery by full-scale weakly coupled simulation [J]. Journal of Fluids and Structures,2007,23(4):531-544.
Sergey Timushey. Development and experimental validation of 3D acoustic-vortex numerical procedure for centrifugal pump noise prediction [C]//Proceedings of the ASME 2009 Fluids Engineering Division Summer Mee-ting. Colorado:[s.n.], 2009.
Dong R,Chu S,Katz J. Effect of modification to tongue and impeller geometry on unsteady flow, pressure fluc-tuations, and noise in a centrifugal pump[J]. Journal of Fluids Engineering,1997,119(5):506-515.
Thilo Michels,Marian Markiewicz,Otto von Estorff. Sound generation and propagation in a centrifugal pump with the finite volume EIF-approach [C]//Proceedings of ASME Turbo Expo. Copenhagen:[s.n.], 2012.
Sun Liyun. The design and heat dissipation calculation of S-type motor water cooling system [J]. China Science and Technology Review,2011,28:331-332.(in Chinese)
吴琳,王宏光. 水冷电动机冷却系统设计与计算[J]. 机械设计与制造,2008(8):41-42.
Wu Lin,Wang Hongguang. Cooling system design and validation for water cooling motor [J]. Machinery Design & Manufacture,2008(8):41-42.(in Chinese)