Here are three reasons for the vibration of gear pump:
A: drive shaft and its auxiliary parts
Long shaft pump, easy to occur shaft stiffness is insufficient, deflection is too large, the straightness of the shaft is poor, resulting in moving parts (drive shaft) and static parts (sliding bearing or ring) rubbing, forming vibration. In addition, the pump shaft is too long, which is greatly affected by the impact of flowing water in the pool, so that the vibration of the underwater part of the pump increases. The balance plate clearance of the shaft end is too large, or the working channeling momentum of the axial direction is not adjusted properly, which will cause the low frequency channeling of the shaft, leading to the vibration of the bearing bush. The eccentricity of the rotating shaft will cause the bending vibration of the shaft.
Two: pump selection and variable operating conditions
Each oil pump has its own rated operating condition. Whether the actual operating condition is consistent with the design working condition has an important influence on the dynamic stability of the pump. The pump runs stably under the design condition, but under the variable condition, the vibration increases due to the radial force generated in the impeller. Single pump selection is improper, or two types of pump does not match in parallel. These will cause the vibration of the pump.
Three: bearing and lubrication
Bearing stiffness is too low, will cause the first critical speed reduction, causing vibration. In addition, the poor closed performance of guide bearing leads to poor wear resistance, poor fixation, large bearing clearance, and easy to cause vibration; The wear of thrust bearings and other rolling bearings will aggravate the longitudinal vibration and bending vibration of the shaft. Lubrication failure caused by improper selection of lubricating oil, deterioration, excessive impurity content and poor lubrication pipeline will cause deterioration of bearing working conditions and cause vibration. The self-excitation of oil film of motor sliding bearing also produces vibration.
My company's main: oil pump | YCB gear pump
