The temperature of the centrifuge shaft bearings was high, but it is now normal after restarting
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As the title indicates, the temperature of the third-stage bearing shells in the centrifuge was high. After restarting the machine, the temperature returned to normal. However, after a month, the temperature rose again rapidly (reaching the alarm threshold within two days); restarting the machine once more brought the temperature back to normal. It’s not clear what the exact reason is. The bearing shells have just been replaced, as has the third-stage rotor. The oil coolers, coolers, and lubricating oil have all been replaced with new ones.
As shown in the figure, the temperature rise curve of the third-stage bearing bush
First, check the oil cooler. Compare the inlet and outlet temperatures of the oil cooler before and after the temperature increase to see if there are any abnormalities. Also, examine the temperature control valve, which is usually mechanical; check whether the valve element is stuck. Use a heat gun to move the valve element to see if it moves freely. Clean the oil cooler to assess the level of dirt present, and check the pressure difference across the lubricating oil filter to determine if it needs to be replaced. Additionally, check if there are any abnormalities in the temperatures of the other bearing shells – or is only stage 3 problematic?
The bearing temperature is rising suddenly, and somewhat periodically – could it be a problem with the bearing itself? Such as wear caused by long-term operation, or slight uneven wear due to installation issues? There are no problems at the beginning of operation, but after running for a long time the issue becomes more severe, leading to abnormally high temperatures?
I think it might be that the oil isn’t clean; after replacing it, the fuel tank wasn’t cleaned properly, so there are impurities present
How long did it take for the temperature to rise after replacing the bearing bush and starting the machine? If factors such as the machine’s structure are ruled out, check whether there is carbon buildup on the lower bearing shells.
Check if there are any issues with the instrument or transmission system.
It’s either an oil issue or a bearing issue
Oil has a cooling effect and can remove heat; here there is a dynamic equilibrium. Analyzing the factors that contribute to this equilibrium, including viscosity-temperature properties as well as the oil supply systems, might yield useful results.
Check the oil cooler, and then check the pipelines.