High temperature in the Roots blower
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After the bearings were replaced in the Roots blower, the temperature was not high when it was started up, and the operating pressure as well as the air volume were normal. However, after it had been running for some time, the temperature of the blower itself rose to over 100 degrees, and the pressure also decreased. When communicating with the manufacturer, it was mentioned that the Roots blower has a minimum speed requirement; yet the other unit could operate normally while the repaired one could not. The status of various adjustments to the gaps is unknown, so everyone can discuss this based on their experience – what exactly causes the normal operation at startup but excessive temperature rise after some time of operation?
It may be necessary to disassemble it once; during the disassembly process, it is important to measure the gaps, record the data, and archive it. In particular, for the gap adjustment position where the gap may increase after high temperatures, is there any room for adjustment? In the future, it’s also a good habit to take measurements and keep records while disassembling, so that the difference in measurements before and after maintenance can be identified. For reference.
Thank you! The main goal is to use this analysis to determine which gap has an impact, so that in the future it will be possible to accurately identify the location of the fault based on the symptoms of the fault.
The professional manufacturer finished the repair, but didn’t explain it clearly?
Has the compression ratio increased? Check the clearances and investigate
This clearance value needs to be determined through measurement, such as the meshing clearance, the clearance between the rotor and the casing, as well as the clearances at both ends of the rotor relative to the casing. Usually, when the gap is large, the corresponding value is small. Imbalance leads to excessive leakage.
1 Check whether the inlet and outlet temperatures of the cooling system are functioning properly. 2. Measure the temperatures of the fan inlet and outlet flanges.
Well, I also suspect that the gap wasn’t adjusted properly, and I wasn’t involved in the equipment maintenance; currently, we can only guess the status of the maintenance based on the observed symptoms.
This is something worth considering; I hadn’t thought of it before. Thank you