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在日常检测水表的工作中,有两块不同口径的湿式旋翼水表受到相同破坏,其计量性能受到的影响,却截然不同。为此,进行了试验分析求证工作。通过试验排除叶轮盒物理位置、顶尖同轴度等偶然因素的影响,选择同系列的水表人为改变其叶轮形状,叶轮形状与受破坏的水表相似,进行试验,实验结果表明同系列的水表结果具有相似性。观察分析,同系列的水表具有相同数量的进水孔,并且形状相似,分析认为受进水孔形状不同的影响,驱动残余叶轮的速度分量有明显的不同,这是造成两块水表受到破坏后,其计量性能受到影响,截然不同的直接原因。
In routine testing of water meters, two different wet rotor rotors of the same caliber suffered the same damage, but their measurement performance was affected by the difference. To this end, conducted a test analysis verification. Through the test exclusion of the physical position of the impeller box, the top concentricity and other accidental factors, choose the same series of water meters artificially change its impeller shape, impeller shape and damaged water meter similar to the test results show that the same series of water meter results have Similarity. Observation and analysis, the same series of water meters have the same number of water holes, and the shape is similar to the analysis that the impact of different shapes of the water hole, driving the remaining impeller speed components are significantly different, which is caused after the two water meters were damaged , Its measurement performance is affected, a completely different direct cause.