Dynamic balance of centrifugal blower rotors
Thread Content
The rotating components of multi-stage centrifugal blowers generally include: impeller, shaft, balance disk, heat dissipation disk, half coupling, etc. Do all these rotating parts need to be individually balanced before assembly? Must each component pass dynamic balance testing before it can be assembled? Should the overall dynamic balancing be done after all the rotating components have been assembled? Is it possible to perform dynamic balancing without installing a half coupling? Since the half coupling wears out more easily than rotating parts such as impellers and shafts in the fan itself, it needs to be replaced more frequently.
It is better to perform dynamic balancing with the half coupling as well for greater accuracy.
The half coupling is broken and can no longer be used; I need to replace it with a new one, and I’ll also have to redo the dynamic balancing. I’ll have to disassemble the fan as well, which is very troublesome. Is it possible to do without a half coupling? As long as the dynamic balance of the newly installed coupling is fine and that of the fan rotor is also fine, then won’t the dynamic balance be okay once the two are assembled together?
No matter how precise the components are, the tolerance range increases during the assembly process. Most of the reasons for wear on fan couplings are issues with assembly accuracy, as well as material problems. If dynamic balancing is performed separately, what is checked is the balance of an individual component, rather than the balance of the entire machine in operation. If the assembly does not achieve the required precision, the coupling will have to be replaced soon. Therefore, it is best to perform dynamic balancing together with the coupling, as it may be troublesome but yields much better results.
Individual components are generally not balanced; balance is done only after assembly
Got it, thanks! :handshake
A single component doesn’t need to be dynamically balanced, but it should be statically balanced, right?
It’s not done either; the machining precision of rotor components is quite high, so leveling is not performed unless it’s necessary. There are relevant regulations specified in the standards
If the coupling has a short lifespan, the cause should be identified and resolved first.
How long can a coupling typically last under normal conditions? Device lifecycle?