變頻離心式泵浦導葉角度之研究

Study on guide vane angle of a variable speed

王旭東

指導教授 ： 姜庭隆 博士

國立屏東科技大學/工學院/機械工程系所/碩士(2009年)

https://doi.org/10.6346/NPUST.2009.00018

摘要

本文研究之目的是探討利用變頻器節能的同時，運用不同的擴散器導葉角(10°，20°，30°)進行實驗，以了解不同頻率運轉下不同的導葉角式是否能進一步的提升效能。經改裝市售的多段離心導葉式泵浦(口徑40mm)及使用台達電VFD-B向量控制變頻器分別測試35hz、40hz、45hz、50hz、60hz所得到的結果分別繪製性能曲線圖，各種導葉角在60hz運轉時效率皆符合JIS規範對40mm口徑之泵浦的標準效率40%，其中尤以10°導葉角最佳。由實驗得到的結果看來，在較低頻率運轉時泵浦效率不如高頻率運轉，而依相似定律法則軸動力與轉速三次方成正比，故低頻運轉應是較節省能源的，故節能應由兩方面討論，一方面效率高即是消耗較少能源獲得較多的功，另一方面則以符合需求為原則，在效率不是最高的條件下，僅使用足夠的能量消耗達成實際需求。

關鍵字

變頻器 ； 擴散器導葉 ； 離心導葉式泵浦 ； 向量控制 ； 性能曲線圖 ； 相似定律

並列摘要

This study of inverter frequency adjustment, observes ‘guide vane angles’ modifications, and affinity law equation to find the frequency adjustments for the most efficient power consumption. The experimental components combine the centrifugal pump with different ‘guide vane angles’ (10°, 20°, 30°) and an inverter. The adjustment of electric frequencies (35hz, 40hz, 45hz, 50hz, 60hz) resulted in various rotary speeds ensuing differences in: flow rate, power consumption, and pump efficiency levels. The findings compared which ‘guide vane angle’ diffuser is most effective with different frequency operation points. Pump efficiencies were compared and found that running at low frequency was inferior to pump operations running at high frequency. The experiment further compared the frequency operation of the pump in accordance with the affinity law equation where the power consumption is equal to rpm cubed and sensitive to ‘vane angle’ modifications which found to save energy at low frequency revolution and therefore, not finding a strong relation between low frequency revolution and ‘guide vane angle’ change. The experimental pump ‘guide vane angle’ change was helpful in finding good operation at wide range and efficient energy saving applications for optimum equipment use.

並列關鍵字

inverter ； centrifugal pump ； guide vane diffuser ； affinity law

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