水泵淨正吸揚程測試系統建置

淨正吸揚程（NPSH）是評估水泵抗汽蝕性能的關鍵指標，對於確保水泵正常運行具有重要意義。本文介紹常見的NPSH測試方法，並依據測試技術比較分析後，選定閉迴路安排的汽蝕試驗方法，設計並建置了一套具備自動化精準控制能力的NPSH測試系統。系統採用閉迴路設計，透過客製化系統設計與核心組件開發，輔以電腦監控設備進行自動化操作與數據擷取，確保測試的精確性與穩定性。核心組件包括密閉水槽、流量計、整流元件、流量調控閥及水溫控制設備，須適當選擇並設計，以確保NPSH測試結果的可靠性。本研究開發之測試技術已獲國內水泵製造業者採用，並投入實際應用，可提高水泵性能評估的準確度及研發效能。

Net Positive Suction Head (NPSH) is a critical parameter for evaluating the cavitation resistance of water pumps, essential for their proper operation. This study presents the design and development of an automated NPSH testing system based on the Vacuum Suppression Method. The research includes a comparative analysis of testing techniques, system design, and the development of key components. The system adopts a closed-loop design and utilizes a Supervisory Control and Data Acquisition (SCADA) system for automated operation and data acquisition, ensuring high precision and stability. Key components include a sealed water tank, flow meters, flow straighteners, flow control valves, and a water temperature regulation system to enhance measurement accuracy. The proposed testing technology has been adopted by domestic water pump manufacturers and implemented in practical applications, improving the precision of pump performance evaluation and enhancing R&D efficiency.