I just acquired a Dentsply DEU-2 pump assembly removed from a dental
practice. It has 1" copper input and output lines, and a pressure regulator
and solonoid valve assembly going to a 1/2 inch copper line going out. (for
water?) There are 2 pumps, each with a 3/4 HP motor. I am trying to figure
out what the requirements are for these pumps to work. Do they need water
for lubrication? Is that what the water line is for? Was there a tank ahead
of this unit to catch the crud, or did it run everything through the pumps?
What maintenance would the pumps require?
If anyone knows anything about these units, I would greatly appreciate
hearing from you.
He didn't say he was using them for dental purposes. He may want to use
them to clean his fish tank or sump pump. That is within the realm of this
Most vacuum pumps require water to make a seal to draw the vacuum. Most
require little maintenance. Dentsply is still around so you may want to try
contacting them for a manual or the pump maker on the nameplate. AFAIK,
Dentsply made the assembly, not the actual pumps.
Feel free to name an appropriate "dental" newsgroup. I couldn't find one
before I posted here.
There are lots of people here with useful real life experience. I guess you
are not one of them.
Perhaps someone with experience with these units may see my posting and
On Wed, 25 May 2005 16:36:07 -0500, Caesar Romano wrote:
He did? Dental pumps are somehow on-topic in a Home Repair newsgroup?
Would it be OK to ask questions about racing cams in a big-block Chevy
engine too? How about the merits of alternative medicine? Would those
questions be "reasonable" too?
If you're not on the edge, you're taking up too much space.
Linux Registered User #327951
I have already done an hour of web search, and can find no hook-up or
operation descriptions. I was hoping someone with experience on these types
of units might be lurking here.
I did my earlier research on recycling refrigerator compressors for
airbrush work. Your dental vacuum pump is just a silent fridge
compressor used as a vacuum pump. The 2 pump configuration is a two
stage set up to get a better vacuum.
Look up any "How they work" books or URLs on the household
refrigerator and you will get a pretty good idea of the innards of
these single cylinder hermetically sealed compressors.
If you want to you can dismantle your two unit setup and use each unit
independently as a compressor or as a vacuum pump. The canister is
welded shut thus "hermetically sealed." Its a high pressure vessel
therefore a bugger to cut open. Don't unless you have a wreaked unit
and want to find out what's inside.
The only difference from regular compressors is that these sealed
units are meant to run with an oil bath inside the sealed canister.
Its just ordinary motor oil so if you do dismantle the units don't
tilt the canister or you will have a pool of oil on the floor. The
oil serves several purposes: to lubricate of course, to act as a
solvent for the refrigerant (no refrigerant in dental vacuum pump) and
to cool the compressor. The cooling solution is neat. The commutator
end of the motor dips into the oil bath. When the compressor is run
oil is drawn up the hollow motorshaft-compressor crankshaft assembly.
This oil spews out like a garden spray at the top and then runs down
the sides of the canister. The solution is the oil picks up heat from
compression when it was drawn through the shaft. This oil is cooled
as it runs down the canister sides. Neat.
These pumps have no similarity to refridgeration compressors. they are
composed of a 3/4 HP motor bolted to a pump which is a few inches in
diameter and 2 inches or so deep. My suspicion is that they are flexible
vane pumps which would require some water for lubrication.
Any possibiity of posting a photo? The key requirement in a dental
practice is to minimisize the noise plus deliver clean air or vacuum.
I went to a dental supplies store for mold making materials and went
through their comperssor - vacuum selection. They were all glorified
fridge compressors, glorified in that there was a lot of fancy
attachments but still the basic fridge canister compressor. Same
thing from a supplier at an industrial equipment show.
One clue concerning water cooled or dry.. Does it have cooling fins on
the outside of pump? Aircraft vacuum pumps are similar, and are dry
but need cooling fins.
Modern medical offices use remote vacuum pumps with pipes run
throughout building. Vacuum is supplied to top of a canister near
dental chair to collect gunk. Bottom of canister has flapper valve
type setup to empty gunk into drain after vacuum is turned off.
Of course. I already know this. From their website, it doesn't appear they
manufacture these units anymore. No useful information is available on their
site as far as I can find. I don't really expect the manufactuer to want to
have a theory of operation discussion on this.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.