BIG blower

[86rocco]

I was just browsing ebay and I came across [url=http://cgi.ebay.com/NEW-YORK-CENTRIFUGAL-PRESSURE-BLOWER-NEW-ON-PALLET_W0QQitemZ7588811622QQcategoryZ53297QQss

PageNameZWDVWQQrdZ1QQcmdZViewItem]this[/url], perfect for anyone who wants to make an INSANELY big flowbench

[Nick]

Careful how you vent that bad boy, you could implode your shop with that thing!!!!!!!!!!!


Nick

[Tony]

But that is exactly the style of pressure blower to get for a flow bench, but perhaps in a slightly smaller size.

[Scott]

Lets say you were going to make a blower, it doesnt have to have a radiused cavity, but what shape/angle would you make the impeller wheel?
What diameter as well?
Would straight blades be okay?

RRBD

[Thomas Vaught]

For the money you could probably buy a brand new Vortron blower like the one I posted a while back. It would be brand new too!

Tom V.

[Tony]

[bruce]

[Tony]

It sounds like you are on the right track Bruce.

That 20" by 1.5" wide rotor sounds VERY interesting. If he has quite a few different blowers around to choose from, maybe he will allow you to test some of them ? He probably has three phase power available right there.

If that 20" diameter rotor runs at around 3400 Rpm, it should develop somewhere around 25" pressure, at quite high flow.

All you need is a selection of roughly made orifice plates ( say 1", 2", 3" and 4") and a nice tall water manometer. The orifice plate will stick to the blower intake with air pressure, and a thin probe can be used sample the down stream suction pressure through the orifice hole. It is a bit rough and ready, but you only need some ballpark figures to get a rough idea to begin with.

Bruce will already know this, but for others reading this thread:

Flow in CFM = 13.55 x square root of pressure (inches of water) x diameter of orifice in inches squared.

So if it will pull 25" of suction through a four inch orifice plate:

CFM = 13.55 x (square root of 25) x ( 4 squared)
CFM = 13.55 x 5 x 16
CFM = 1,084

If you do this with several different sized orifices, you can get a fairly good idea of what that blower can do over a range of pressures and flows.

There is always the possibility of speeding it up, but you first need know where you are at the original running speed.

[bruce]

Testing blowers at the scrapyard is not going to happen sorry to say. They are about scrapping things, but they will sell something to you if you want it. At the price they get for somethings its not a problem, I just have to make sure the blowers are going to be what I need, which I am sure they are from the discussions we have had.

When the weather warms up here in PA a little more I'll spend sometime and get a few pics to post so I can confirm they are what they need to be.