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液压泵生产厂在样本或试验报告中,一般只提供泵在额定转速下的负荷特性曲线,或者只提供泵的排量、额定压力、额定转速及额定工况下的输入功率。而在实际使用中,并非都是在额定工况下使用的。在非额定工况使用时,如果采用一般流量计算公式(Q=q_0n/1000η_v)来计算,则式中的容积效率η_v无法确定,因η_v随压力、转速的不同而变化。若按额定工况时对η_v计算,则误差较大。同理,输入功率也难以计算。为了得到较准确的计算方法,从多次液压泵的试验记录中发现,泵的性能因转速、压力不同而变化是有一定规律的,从而总结出一些
In the sample or test report, the hydraulic pump manufacturer usually only provides the pump load characteristic curve at rated speed, or only provides the pump displacement, rated pressure, rated speed and input power under rated conditions. In actual use, not all are used under rated conditions. In the non-rated conditions, if the general flow calculation formula (Q = q_0n / 1000η_v) to calculate, then the volumetric efficiency η_v can not be determined because η_v varies with pressure and speed. If rated operating conditions η_v calculation, the larger the error. Similarly, the input power is difficult to calculate. In order to get a more accurate calculation method, it has been found from the test records of many hydraulic pumps that the performance of the pump has some regularity due to the change of speed and pressure, so as to summarize some