Dynamic balancing of multi-axis compressor impellers and rotors
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Dear sea friends: Hello everyone! At present, in China, imported multi-axis compressors (MAN, GHH, Atlas, Kubel) use a fixed connection method with end-face teeth for their impellers and shafts. I have a question: after being in use for so many years, are there any spare parts that need to be replaced for the impellers? If I need to replace it, can I just do the replacement directly, or are there certain things that need to be checked first? For example, in the case of contact inspection of end-face teeth, is there significant wear due to years of operation? Have you seen any requirements for a clearance fit between the lock nut and the inner bore of the impeller? For dynamic balancing, is it necessary to perform it separately on the impeller? With an end-face tooth structure, how can the impeller be balanced separately? The entire rotor is balanced; after replacing the impeller, is it only necessary to perform low-speed dynamic balancing or is high-speed dynamic balancing also required? I hope everyone can give me some guidance; thank you!
Hello! I work on the maintenance of imported compressors. If a unit has been in operation for many years, there is no need to replace the impeller unless it is damaged; proper maintenance is sufficient. Over time, the teeth on the impeller can become worn out due to prolonged use. First: There must be a specified gap between the lock nut and the shaft impeller. Second: The dynamically balanced impeller must be balanced separately, followed by balancing of the shaft gears, and then balancing of the rotor. Whether high-speed balancing of the rotor is necessary depends on its operating speed!
Thank you for your strong support! I would like to learn more about the following questions. 1. Errors may occur due to the differences in the fixtures used for the individual balancing of the impeller and in the positioning of the end-face teeth. 2. I’m not sure whether high-speed dynamic balancing is required for a speed of 13,000. 3. If the end-face teeth are worn, and a new impeller has been manufactured, the contact area should be checked and adjusted as appropriate.
1: Balancing the impeller alone does not result in excessive errors; the error is acceptable. At a speed of 2:13000, high-speed dynamic balancing is not necessary; it fully meets the requirements for using the main unit. 3: If the end teeth of the new impeller can be measured in relation to the shaft, no correction is necessary. 4: I specialize in selling maintenance parts for imported machinery; feel free to reach out if you need anything further!