Changsha Zoomlian Pump Co., Ltd. 长沙中联泵业股份有限公司

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    Solution for Unstable Rotational Speed in High-Efficiency, Energy-Saving Multistage Pumps

    Publication Date:

    2026-07-09

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    In industrial applications, Changsha Zoomlion Pump Industry’s high-efficiency, energy-saving multistage pumps often experience unstable rotational speed. This issue not only degrades pump performance and service life but also adversely affects the stability of the production line. To address such failures, we recommend troubleshooting and resolving them from the following technical perspectives: 1. **Power Supply System Inspection**: Use a multimeter to measure three-phase voltage stability; fluctuations should be kept within ±5% of the rated value. If voltage deviations are detected, install an intelligent voltage stabilizer or an uninterruptible power supply (UPS). Simultaneously inspect cable insulation for aging; it is recommended to use YJV22 0.6/1 kV cross-linked polyethylene insulated armored cables. Prior to replacement, verify insulation resistance with a megohmmeter, ensuring it meets or exceeds 10 MΩ. 2. **Overcurrent Component Inspection**: After disassembling the impeller, use a laser diameter gauge to assess blade wear. If unilateral wear exceeds 3 mm, perform weld overlay repair or replace the component. When cleaning the impeller passages, employ an endoscope to identify the nature of blockages; if crystallization is present, use an ammonium citrate solution for chemical cleaning. For the bearing system, measure radial clearance; if it exceeds 0.15 mm, replace with SKF 6314/C3 class bearings. 3. **Control System Parameter Calibration**: Access inverter parameters via PLC programming software, paying particular attention to PID tuning coefficients (P = 20%, I = 5%, D = 1%) to ensure they align with process requirements. Implement closed-loop control using 4–20 mA signal feedback, and regularly calibrate Hall-effect sensors to maintain accuracy within ±0.5%. 4. **Piping System Optimization**: Monitor flow rate fluctuations using electromagnetic flowmeters; if variations exceed ±10% of the rated flow, install additional pressure‑stabilizing tanks. Equip pipelines with automatic air vents to keep the gas content below 0.5%. 5. **Preventive Maintenance Plan**: Establish a three-tier maintenance framework: daily inspections, monthly servicing, and annual overhauls. Key data collection should include vibration spectra (peak ≤ 4.5 mm/s), bearing temperatures (≤ 75°C), and motor stator temperatures (≤ 110°C). If the above measures fail to resolve the issue, contact the Changsha Zoomlion Pump Industry Technical Service Center. They will conduct a thorough diagnosis using specialized equipment such as infrared thermal imagers and oil contamination analyzers. The technical service team will provide a “High-Efficiency, Energy-Saving Multistage Pump Fault Diagnosis Report,” clearly identifying fault locations and offering tailored solutions.

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