The double-support centrifugal pump has high vibration. Please help analyze the reason.
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This post was last edited by 273655466 on 2019-7-22 16:58 Our factory has a double-support centrifugal pump. It was repaired a month ago due to high vibration. At that time, it was suspected that it was a bearing problem, so only the bearing was replaced. After the replacement, the vibration not only did not decrease, but was also higher than before. Please help the experts diagnose it. If it needs to be overhauled, what parts should be inspected? ,,1961016 [/attach
Review a few questions: 1. Factory rotor dynamic balance (whether rated speed is used) ； 2. Whether the entrance and exit pipes are installed stress-free ； 3. Foundation condition ； 4. Alignment situation ； 5. Whether the center of the rotor and the pump are consistent
1. Dynamic balancing cannot be done, there is no dynamic balancing machine. 2. The entrance and exit pipes are stress-free. 3. There is no problem with the foundation. 4. The alignment check was within the standard range using a laser alignment instrument. 5. It is difficult to check the center of the rotor and pump.
Ask the pump factory how many blades the pump impeller has. If the spectrum has six times the frequency, first rule out fluid excitation.
1. Test the motor alone, check the motor bearings, measure the vibration of the motor bearings, and check whether the motor anchor bolts and gaskets are normal. If there is no problem, check: 2. Whether the coupling alignment meets the requirements. 3. Check whether the pump anchor bolts and gaskets are normal. 4. Check the assembly condition and clearance of the pump bearings. 5. Check the tightening condition of the pump plate anchor bolts. 6. Check whether each bearing is short of oil. Check whether it is caused by pump surge when running. It is not only necessary to measure the vibration, but also to measure the temperature of each operating part, listen to the sound, and make a comprehensive judgment to draw a diagnostic conclusion.
Thank you, I will check how many blades the impeller has tomorrow.
There are only 3 blades, single-stage double-suction impeller.
There is a triple frequency at the drive end, which may be related to the fluid. Is the pump body a double volute type?
The pump model is 250AYS210, which is not double-cased. We plan to open it next month and check it out.