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What is this red sleeve called in the attached picture of an impeller blade? Answered

Obviously the center red sleeve is for adjustment over minor difference in the shaft diameter.  Can you please tell me the technical term used for the red piece?

Thanks.

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Downunder35m

4 years ago

That looks like the fan to cool a medium sized motor.

If that is the case than your only concern is to center it properly.

I had to fix one that broke off as someone dropped a froklift load on the machine.
Original had a screw fitting like in your first pic but without the foam.
One half was missing after the accident.
We simply made a centre plate drawing - many centered rings printed on paper.
Small pin in the center and the fan aligned on top of it.
Some Playdoo to form a "pot" in the middle.
Filled up with epoxy resin and an hour later the hole for the motor shaft was drilled out using the guide hole from the center pin.
All that was needed was a drop of super glue to firmly attach it and I think it survived like that after I left the company 3 years later.
So if in doubt filling the center and drilling the right hole might be easier in some cases...

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kabiraDownunder35m

Reply 4 years ago

Yes, I was thinking along those lines too. I do have access to a bench drill for a straight centered hole.

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sixsmith

4 years ago

looks like some sort of split bushing. and it looks like it's got a small key on the back side. I've not seen this type of bushing before, but I would guess that the nut/bolt assembly tightens the red bushing around the shaft, and the little part that sticks out the back is an intigrated key so that if impeller catches on something it'll break and save the motor

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kabirasixsmith

Reply 4 years ago

Thanks Six.

>>but I would guess that the nut/bolt assembly tightens the red bushing around..

That is exactly what it does. The reason for my question is, I have a few impellers with a different mechanism to attach them to a shaft (Please see attached.) This method requires me to machine the shaft for a proper fit, which I don't want to. However, converting these impellers to the design with red ring is a possibility.

Impeller2.JPG
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sixsmithkabira

Reply 4 years ago

that second impeller looks like it had some rip out in the are awhere the shaft goes. I do not envy you trying to match that hole and centering the shaft. I had a saw blade I got the other day that the 3/8 bushing was slightly smaller than my 3/8 mandrel, so I took one of my pocket knives and very carefully shaved of a little bit on each quadrant of the bushing till it fit, I don't have access to any machining equipment, but it sounds like you might, you might be able to get away with reaming out the impeller mounting hole to make it fit the shaft, if the shaft is larger. with that red split bushing design you might have a greater allowance for slop in the fit.
is this for liquids or air? with liquids I think you can get cavitation damage if it's not properly centered, I'm not positive on that though. with air, and low pressures, I don't think you'll have too much trouble as long as you aren't rubbing the impeller housing.

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kabirasixsmith

Reply 4 years ago

I do not have access to heavy duty machining equipment but I do have a bench drill and a steady hand :). The material is plastic so the damage in centering is somewhat repairable.