Disassembly of a centrifugal fan

BroadReach · Jul 4, 2013

Does anyone have any tips on how to disassemble a centrifugal fan?

It is a double inlet type with an external rotor motor, i.e. the central shaft is stationary and the rotor / impellor assembly rotates.

The impellor / rotor assembly comes out easily enough by removing one of the end support spiders.

What I wluld like to do is disassemble the impellor / rotor assembly to look at the bearings.

The image is of a similar design to the one I have.

Any ideas?

telectrix · Jul 4, 2013

remove all screws. pull it to bits. reassemble in reverse order and if you only have 5 or less screws left over, job's a good 'un.

Spoon · Jul 4, 2013

Take pics of each stage, just in case you forget there bits go.

Guitarist · Jul 4, 2013

To be perfectly honest, only you, with the fan in your hands, will be able to see how it needs to come apart. There is always the chance that it's pressed or riveted and not meant to have its bearings replaced.

Engineer54 · Jul 4, 2013

What are you going to do if the bearing are found to be shot, (which would have been evident before any disassembly)?? Do you have the equipment to pull the bearings and drift the new bearings back onto the shaft?? These day's, it more cost effective to give the assembly to a workshop and have to job done professionally, than to start faffing around trying to do it yourself...

vaughant · Jul 4, 2013

Engineer54 said:
What are you going to do if the bearing are found to be shot, (which would have been evident before any disassembly)?? Do you have the equipment to pull the bearings and drift the new bearings back onto the shaft?? These day's, it more cost effective to give the assembly to a workshop and have to job done professionally, than to start faffing around trying to do it yourself...

have to agree with that,extremely unlikely it will be more cost effective to repair than replace.
if its just cos you don't want to bin it and have a spare then have a play about,it's gonna be different for every motor so no real advice other than to google image the part number and see if there's an assembly diagram for it.

remember if its Ex equipment your not meant to fiddle about with it.

stranded · Jul 4, 2013

Spoon said:
Take pics of each stage, just in case you forget there bits go.

Defo do that. Sometimes screws vary slightly for different bits, so set the screws with the bit you remove if you know what i mean. As guitarist says,though, might not be meant to come apart...

stranded · Jul 4, 2013

vaughant said:
Engineer54 said:

What are you going to do if the bearing are found to be shot, (which would have been evident before any disassembly)?? Do you have the equipment to pull the bearings and drift the new bearings back onto the shaft?? These day's, it more cost effective to give the assembly to a workshop and have to job done professionally, than to start faffing around trying to do it yourself...

Click to expand...

have to agree with that,extremely unlikely it will be more cost effective to repair than replace.
if its just cos you don't want to bin it and have a spare then have a play about,it's gonna be different for every motor so no real advice other than to google image the part number and see if there's an assembly diagram for it.

remember if its Ex equipment your not meant to fiddle about with it.

Most things are built "disposable " nowadays anyway " ah sure it's broke. buy a new one. Stuffs not built like years ago, even electronics, cheap chineese crap now.

chrish_1977 · Jul 4, 2013

telectrix said:
remove all screws. pull it to bits. reassemble in reverse order and if you only have 5 or less screws left over, job's a good 'un.

Or I also like to call it weight saving too

Marvo · Jul 4, 2013

I can tell you that the Ziehl, EBM and Systemair fans with external rotor motors aren't designed to come apart. With the older generation I made a special tool for splitting them and also a checking fixture for reassembly with a press but the new ones are a lost cause. If anything fails the whole fan goes in the scrap bin.

Silly Sausage · Jul 4, 2013

Remember, we're men, we like taking things apart!

Then trying to work out how to put them back together...

stranded · Jul 4, 2013

Archy Styrigg said:
Remember, we're men, we like taking things apart!

Then trying to work out how to put them back together...

Done that far too many times, cant help mself though...

Silly Sausage · Jul 4, 2013

stranded said:
Done that far too many times, cant help mself though...

I've got three pinball machines in several 1000s of bits at the moment.
Must deal with it, worth about £6000 when they're all done!

vaughant · Jul 4, 2013

Yeah if there's nothing better to do then have a go at stripping it out but if its important and not working get a new one first!!!!

telectrix · Jul 4, 2013

and if you fit it and it seizes and catches fire, who's in the dock? BIN IT.

Disassembly of a centrifugal fan

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