The causes of abnormal vibration and noise during operation of the RCB high-temperature hot oil pump generally have the following aspects: 1. Cavitation occurs. Bubbles and bubble rupture during cavitation, causing vibration and noise. If it is due to vibration caused by pump cavitation, consider changing the installation height or increasing system pressure, and may even need to re-select or design the pump. What are the causes of abnormal vibration and noise when the RCB high temperature hot oil pump is running?
The reasons for abnormal vibration and noise generated when the RCB high temperature hot oil pump is running generally have the following aspects:
1. Cavitation occurs. Bubbles and bubble rupture during cavitation, causing vibration and noise. If it is due to vibration caused by pump cavitation, consider changing the installation height or increasing system pressure, and may even need to re-select or design the pump.
2. The rotor balance is reduced. When the rotor is unbalanced, the center of gravity of the rotor and the center of rotation deviate too much, and the unbalanced force will be generated when rotating. The vibration generated by Botaibang especially at high speed is more obvious. On the one hand, when the rotor is manufactured or assembled, the rotor balance does not meet the design requirements; on the other hand, after the pump is running for a certain period of time, the balance accuracy of the rotor is lowered due to some reasons such as deformation of the shaft and excessive eccentric wear of the parts. In both cases it is necessary to re-balance the rotor.
3. RCB high temperature hot oil pump is in the non-design condition area. The RCB high temperature hot oil pump is best operated at the design point, avoiding operation in small flow areas and large flow areas as much as possible. Otherwise, the increase in oil pressure will cause vibration. When the oil flow is passed from the outer end of the impeller blade through the tip of the guide vane or the volute pump tongue, an oil impact will occur, and the degree of impact increases with the increase of the speed and size of the oil pump. When this oil force pulse is transmitted to Noise and vibration are generated when the piping system and foundation are used; if the frequency of this oil pulse is similar to the natural frequency of the pump shaft, piping system or foundation, more severe resonance will occur. In practice, the following methods or measures can be used to prevent and mitigate the vibration caused by oil shock: Botou Taibang Pump & Valve Manufacturing Co., Ltd. (1) appropriately increase the distance between the outer diameter of the impeller and the diaphragm of the pump casing, that is, increase the impeller The gap between the oil outlets.
(2) Change the profile of the runner to avoid sudden changes in the runner area or sharp changes in the flow direction to mitigate the adverse effects of oil shock.
(3) When the multi-stage pump is assembled, the blade outlet edges of the impellers of each stage should be staggered according to a certain pitch, and the assembly position of the guide vanes should not overlap each other, but arranged in a certain order. These measures will be Will reduce the oil pulse. If the resonance frequency of the pipeline system is changed, the oil shock of the pump cannot be reduced. Only by taking measures to reduce the intensity of the blade pulse in the oil force design of the pump can the problem be solved fundamentally.
4. The impeller flow path is blocked. When there is foreign matter in the impeller flow passage, the impeller is heavy and the force is not uniform. At this time, the impeller needs to be removed for thorough cleaning.
5, bearing reasons. If the bearing is damaged, in addition to its own running noise increase, the movement of the rotor will be destabilized, which will cause the vibration and noise of the pump unit to increase. In addition, the radial clearance of the bearing is too large, which may also cause abnormal noise. The bearing needs to be replaced at this time.
6, the reason for the installation. If the RCB high-temperature hot oil pump and the base, the base and the foundation are loose, and the coaxiality of the coupling between the motor and the pump is too low, vibration and noise may occur. It is necessary to retighten the coupling bolts or re-align.
In addition, if the oil inlet conditions are not good, a bad vortex belt appears, or the medium contained in the medium contains gas, it may cause abnormal vibration and noise.
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