逆止阀导致噪音振动大实例
Check valve cause of vertical pump high noise and vibration
一、服务背景Service Background
KSB SPFC 150-430A 水泵运行有异响
Abnormal noise of water pump operation
二、服务内容Service Content
SPFC 150-430A 现场位号：#4
1）到达现场后，让业主启动泵，测试噪音值为84dB，如下图,（ 周围环境安静）。振动值电机座振动为3.0mm/s(轴径向）,泵轴承箱振动达到6.3mm/s(轴径向），电机驱动端振动达到8.5mm/s(径向）。
After arriving at the site, ask the owner to start the pump, and the test noise value is 84dB, as shown below (the surrounding environment is quiet). Vibration value The vibration of the motor base is 3.0mm/s(axial and radial direction), the vibration of the pump bearing box is 6.3mm/s(axial and radial direction), and the vibration of the motor driving end is 8.5mm/s(radial direction).
2）检查泵与电机联轴器，轴向与径向对中均符合要求。泵手动盘车，很灵活，无卡阻现象。
Check pump and motor couplings, axial and radial alignment meet the requirements. Pump manual turning, very flexible, no stuck phenomenon.
3）停#4泵时，启动挨着的#3号泵，#3号噪音值为74dB,振动均在4.5mm/s以内。奇怪的是，用手摸#4号泵轴承室，振感强烈。测量振动值居然达到5.7mm/s（下图1）。把#3泵停机，#4号泵振动消除。同样，启动离#4号稍远的#2号泵，测量停机的#4号泵轴承室，振动值居然达到2.6mm/s（下图2）。
When the #4 pump is stopped, the #3 pump next to it is started. The noise value of #3 is 74dB, and the vibration is within 4.5mm/s. It is strange that the vibration is strong when touching the bearing chamber of #4 pump by hand. The measured vibration value is 5.7mm/s (Figure 1 below). Shut down pump #3 and eliminate the vibration of pump #4. Similarly, when the #2 pump, which is slightly away from #4, is started, the vibration value of the bearing chamber of #4 pump, which is shut down, is actually 2.6mm/s (Figure 2 below).
4）四台立式泵现场分布照片如下图，白色为逆止阀：
The field distribution photos of four vertical pumps are as follows, and the white is the check valve:
泵噪音振动大原因分析：
Cause analysis of pump noise and vibration:
1，#4号泵出口逆止阀，存在关闭不严情况，当#4停机，旁边#3泵、#2泵启动时，#4泵出口管路有回流情况。
No. 4 pump outlet check valve, there is a situation of lax closure, when #4 stop, next to #3 pump, #2 pump started, #4 pump outlet pipeline reflux situation.
2，单独运行#4号泵时，由于出口阀门的缘故，存在出水不通畅情况。故泵组噪音与振动偏大。
When No. 4 pump is run alone, the water is not unobstructed due to the outlet valve. Therefore, the noise and vibration of the pump group are large.
3，请客户检查#4号出口管路逆止阀是否有卡异物，或者阀门出现磨损或故障的情况。
Please check whether the No. 4 outlet pipeline check valve has any foreign body stuck, or the valve is worn or faulty.