变频调速水泵装置变速特性试验研究

为探明变频调速水泵系统中水泵、电机和变频器的综合效率与水泵转速间的关系,通过试验得到不同转速对应的流量和综合效率,并基于最小二乘法对所得数据进行拟合分析。结果表明,在泵站实际运行中,标准比例律公式并不适用于所有的频率范围,变频器调频范围在39.0～41.5Hz时,水泵严重偏离高效区运行,效率值在0%～70.4%间急剧上升,调频范围在41.5～50.0Hz时,效率值在82.28%～88.75%间上升速率较缓;针对水泵变频前后频率比与流量、效率比的关系所拟合的关系式的相关系数分别为0.996、0.981,表明拟合关系式具有较高的可靠性,变频前后的转速比与流量比成二次相关关系,与效率比成三次相关关系。该研究结果可为实际工程中变频调速水泵调频范围的计算提供有益借鉴。

Experimental Study on Frequency Conversion Speed Regulation Characteristic of Water Pump Device

In order to find out the relationship between the comprehensive efficiency of pumps, motors and transducers and the speed of pumps in variable frequency speed regulating pump system, the flow rate and comprehensive efficiency corresponding to different speeds are obtained through experimental research. And then the obtained data are fitted and analyzed based on the least square method. The results show that the standard ratio formula is not applicable to all frequency ranges in the actual operation of pumping stations. When the frequency range of frequency converter is 39 Hz to 41.5 Hz, the pump deviates from the high efficiency zone seriously, and the efficiency rises sharply between 0% and 70.4%. While the efficiency rises slowly between 82.28% and 88.75% when the frequency range is 41.5 Hz to 50 Hz. The correlation coefficients between flow rate and efficiency are 0.996 and 0.981, which indicates that the fitting relationship has high reliability. The frequency ratio before and after frequency conversion has a quadratic correlation with flow rate ratio and a cubic correlation with efficiency ratio. The research results can provide useful reference for the calculation of frequency modulation range of variable frequency speed regulating pump in practical engineering.