Noise and vibration of end suction centrifugal pump
现场投诉水泵运行有较大噪音。The site complained that the water pump operation had a big noise.
1，拆泵前检查：Check before removing the pump:
1.1到现场拆泵前，检查噪音值为82dB(未超过85dB标准值）。Before disassembling the pump on site, check the noise value of 82dB(not exceeding 85dB standard value).
1.2泵与电机轴承位置振动值最大值达到2.2mm/s（未超过4.5mm/s标准)。The maximum vibration value of pump and motor bearing position reaches 2.2mm/s (not exceeding 4.5mm/s standard).
2，在现场检查发现以下几点，并做相关处理:The following points were found in the on-site inspection, and relevant treatment was done:
2.1 由于水中含有颗粒杂质，水泵口环处有磨蹭痕迹，清理叶轮以及耐磨环处高点。Because the water contains particle impurities, there are abrasion marks at the pump mouth ring, clean the impeller and the high point of the wear ring.
2.2 入口滤网含有很多类似焊渣的大颗粒。The inlet filter contains many large particles similar to welding slag.
2.3 电机风扇罩壳下方螺丝松。The screw under the motor fan cover is loose.
3，现场整改以上的问题点后，重新开启水泵，噪音值79dB, 电机与水泵振动值最大处为1.0mm/s远低于4.5mm/s标准。After correcting the above problems on site, restart the water pump, the noise value is 79dB, and the maximum vibration value of the motor and water pump is 1.0mm/s, which is much lower than the standard 4.5mm/s.
三、建议项Advice & Suggestion
建议水泵经常开一开，停机过久的话，轴承处润滑会变差。It is recommended that the pump often open, shut down for a long time, bearing lubrication will become poor.