PSI

[pertymouth52]

I'm in the process of producing hand held fans. The design consists of a battery operated DC micro motor that I can attach a 2 inch or 3 inch aluminum fan blade. The unit will be placed in a chamber and needs to push about 60 psi through a 3/4 inch diameter hole at the end of the chamber.

My first prototype used a 12V, 15,000 rpm DC micro motor attached to a 2" diameter fan blade but wasn't producing enough psi. How many rpm will it take to produce the 60 psi? Thanks.



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esquared
Anandtech Forum Director

 

[Meghan54]

How many licks does it take to get to the center of a Tootsie-Roll Pop?

 

[SpatiallyAware]

I don't know the math for it, but a lot. I believe you're looking for more of a compressor than a fan since it goes from 2" fan down to .75" opening. 60psi constant through 3/4" seems like it would be difficult.

What is this for? Clearly it's not a hand fan like you claim.

 

[SpatiallyAware]

You might get more mathematically exact answers in our highly technical forum. It's very useful but can take awhile before you get replies.

http://forums.anandtech.com/forumdisplay.php?f=22

 

[phucheneh]

Odd first post, for sure.

General intuition says nothing near 60psi is possible with a fan. Doesn't matter what diameter it is, doesn't matter how much you neck down the output. You can build velocity, but as soon as you encounter resistance to the flow of air, it's just going to start pushing back through the fan blades.

Think about trying to fill tires with a fan rather than an air compressor. Hell of a task.

Compressors are for pressure, unsurprisingly. Fans are for volume.

 

[twinrider1]

60psi sounds like an enormous number for open system.

I think you'll need to look into one of these...

 

[jlee]

I'm in the process of producing hand held fans. The design consists of a battery operated DC micro motor that I can attach a 2 inch or 3 inch aluminum fan blade. The unit will be placed in a chamber and needs to push about 60 psi through a 3/4 inch diameter hole at the end of the chamber.

My first prototype used a 12V, 15,000 rpm DC micro motor attached to a 2" diameter fan blade but wasn't producing enough psi. How many rpm will it take to produce the 60 psi? Thanks.

One of these guys might pull it off.