I was working on some 60krpm turbomachinery recently and ended up going
with the following: http://www.gmnbt.com/cf-seal-product-numbers.htm
They have a series of lab. seals which match up nicely with typical metric
bearing and are designed to properly transmit preload. More specifically
the price on these is right; I think I was paying for a *CF 6005
<http://www.gmnbt.com/product-view.htm?type=s&product=216>* (25mmX47mm)
between $50 to $75 a piece.
I initially was going to go ahead and design my own as well, but for the
relative simplicity of these things, it made more sense to just go ahead
and get them.
-Dan Pastuf
On Fri, Jul 17, 2015 at 12:39 PM, David Weinshenker <daze39@xxxxxxxxxxxxx>
wrote:
Monroe L. King Jr. wrote:
Ive been thinking about a labyrinth seal for the pumps that would be
easy to make.
The following may work:
Make a bushing with a threaded hole, such that the "inner peak" of
the threads would interfere with the shaft, then ream out to a slight
clearance on the shaft (or tap an undersized thread in a clearance hole) -
the idea would be to have a "flat-topped" internal thread that would act
as a labyrinth seal around a smooth shaft.
-dave w
