retention head for wvo

[liam]

I do not live anymore in the USA. Can someone help me designing a good retention head? around 20-25 kw needed.

[liam]

Meaning I'm far away now from USA and shipping is impossible...

[liam]

at least some advice please!

[doug]

I made mine from an old stainless steel microwave. Cut a 2 inch strip long enough to wrap around the blast tube and tack welded it to gather to make a collar. To make the deflector I cut a 4 inch diameter piece. Cut a hole in the center of it to clear the nozzle. Then made cuts from the out side diameter toward the center. Then tack welded the deflector to the collar. I could slide the s/s retention head in and out on the blast tube. When it was were I wanted it I drilled a hole through the collar and blast tube to secure with a screw
.http://wasteoilheaterforum.com/index.php?topic=102.0

[Russ]

I'm not much help here.  I bought mine from Kagi.

[liam]

Also doug said în his topic that finally ordered one. It's true little money not the best results. So it may end in having to buy one. Like I said from where I live now the shipping is around 250$ for a retention head with dhl. For me is now impossible. I have tried to make one similar to Kagi retention head. No great results. Did not know the diameter of the hole for the nozzle And electrodes And the angle of the pales. Is seems like the hole have to Be around one inch in center And the pales should be at the angle of 45°. Not great results. With a retention head bought online there are people that cleaned the furnace twice a season. My retention head had to Be cleaned at least once a week. I know when I have to clean mine after looking at the smoke. The best that looks ok for me is the one made by inov8. It seems like I can make a similar one but I have a lot of unknown dimensions. I do not know it it îs legal to share them here for copyright reasons.

[liam]

I can make something in the style of supreme 5 retention head. Any suggestion?

[Russ]

I found this info over at altfuelfurnace:

I once tried to make a turbine style retention head.

Used .02" stainless steel. Length: Inside blast tube diameter times
3.14. Wide: about .5" + length of the vanes. This vane length
depends on the diameter of the blast tube and the open space you
want to have around the nozzle. Now you can cut this piece of strip.
The vanes are about .3" wide, but that's random. Less vanes will
give less swirl. Scratch the vanes and the line where the 90* or
60* fold comes in the strip. Drill a .1" hole where the vane scratch
ends on the fold line. Cut the vanes towards the hole. Since the
holes are all in one line, the cuts have all the same length. Bent
the vanes over the folding line in whatever angle you want. Twist
the vanes in the angle you want and align them. Carefully bent the
remaining .5" strip in a circle. Put it in the blast tube and align
again the vanes till you're satisfied. Some screws to attach it to
the tube.

I did not fire it for a long time, because the flame pattern didn't
match the narrow recirculation tube. Lots of swirl in the first 10"
of the flame though. It is an excellent head for short chambers. The
vanes didn't get hot, but wet with oil.

[liam]

I've already tried it but " The vanes didn't get hot, but wet with oil."

maybe some settings wrong?

[Russ]

Hmm, not sure on that.  I wish I could help, but unfortunately that is all I could find in my searches.