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An idea for dust collector modifications #2: Fine dusts filter via water.

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Blog entry by Craftsman on the lake posted 05-29-2013 10:36 PM 4936 reads 0 times favorited 6 comments Add to Favorites Watch
« Part 1: Modifying the standard collector, would it work? Part 2 of An idea for dust collector modifications series no next part

The picture below is of the after stage thein I mentioned in the first part of this blog along with an addition.

If I have a bucket of water in the shop, along with my walls eventually getting coated with dust from it seeping out of my poor filter bag on my dust collector the water get filled with dust and it sinks to the bottom. after a few days of heavy wood cutting a 1/4” layer of dust is at the bottom. Yes I know, I need to do something about this. Part of it is my mediocre dust collector and part of it is my need to get it better to my collector from my various tools. But that’s another set of issues.

I mention the water because I had an idea of using it to trap the fine dust. It would be simply a spray of water that the dust has to pass through and hopefully get caught up in the water and wash down into a bucket. The diagram below shows a 1/2” pvc pipe suspended in the center of a 6” a pvc pipe. The whole thing would be hanging in a bucket. In the bucket is a small sump pump that is submersible. It would all be wired together to a plug so that when the dust collector was turned on the pump would run also. The pump would send water up and into the 1/2” pvc pipe. The pipe has multiple small horizontal slits cut in it that would spray water out 360. i.e. the slits wold be cut on the pipe rotating around it. The pipe is capped at the bottom so the water is forced out of the slits.

I’m wondering if by the time the dust and air gets to the bottom of the pipe if it would be trapped by the water and drain into the bucket to be sucked up again and trap more dust.

Another thought would be to make the downward 6” pipe much larger. The air would be slowed considerably and the dust might be caught more easily by the water.

Thanks for your thoughts. It will be at least a year before I might try this as I’m currently very busy but It’s been in the back of my thoughts for awhile now.

-- The smell of wood, coffee in the cup, the wife let's me do my thing, the lake is peaceful.



6 comments so far

View pintodeluxe's profile

pintodeluxe

5702 posts in 2836 days


#1 posted 05-29-2013 10:48 PM

I like the water idea. Reminds me a little of the human body, the way it traps dust on wet nasal tissue.
As long as the baffle is efficient enough to keep large dust particles out of the water bucket, it just might work.

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

View cpd011's profile

cpd011

90 posts in 3260 days


#2 posted 05-29-2013 11:12 PM

I think you might be dumping a lot of water vapor into your shop. That amount of air volume is going to be carrying a lot of water with it when it leaves the bucket area. It is similar in concept to the drywall sanding vacuum system that blows the dusty air through the water capturing the dust. It works very well.

View nailbanger2's profile

nailbanger2

1041 posts in 3166 days


#3 posted 05-29-2013 11:20 PM

Rainbow vacuums use this idea, and they seem to work pretty well.

-- Wish I were Norm's Nephew

View Loren's profile

Loren

10476 posts in 3671 days


#4 posted 05-29-2013 11:37 PM

There’s a guy who used a dust deputy and some 5 gallon
pails to rig up a water separator. He used a shop vac and
there was barely any dust in the vacuum. He made
a video describing it.

I’ve thought about rigging up a water pre-filter in between
my blower and filter. My concern was that pushing the
air might not be as effective as pulling it through the
water filter.

View Semahoro's profile

Semahoro

1 post in 431 days


#5 posted 02-01-2018 01:57 AM

this is a really old post, so I guess you never tried it. But I am getting ready to finally build a Thein separator and have a pleated filter that is open on both ends. I am thinking that a water tray at the bottom will capture the fines which settle. I agree that the rainbow vacuum uses this principle very well. It requires frequent water changes however. I have not figured out how to make a rainbow vacuum work with a DC system that uses a 6 in pipe

View Craftsman on the lake's profile

Craftsman on the lake

2794 posts in 3460 days


#6 posted 02-01-2018 01:14 PM



this is a really old post, so I guess you never tried it. But I am getting ready to finally build a Thein separator and have a pleated filter that is open on both ends. I am thinking that a water tray at the bottom will capture the fines which settle. I agree that the rainbow vacuum uses this principle very well. It requires frequent water changes however. I have not figured out how to make a rainbow vacuum work with a DC system that uses a 6 in pipe

- Semahoro

Actually, I did build it. You can see it here It did work, and quite well actually, But alas some of the more chippy stuff came through over time and it would eventually build up in the water. When it swelled it would take up much more space than when dry. So… an inch in the bottom of the bucket would swell to 3-4 inches. It didn’t take too long before I’d have to change out the water. A bit more work that way and inconvenient, especially in the winter. That, along with the fact that I only heat the shop in the winter when I’m out there (I live in Maine) freezing was an issue. It takes all day to thaw out a block of ice that size.

I contemplated a mild antifreeze/water mixture but I’d still have to empty it frequently. I thought about a self washing basin using a pump and holding tank, and a few other ideas. The end result was that in the long run It would be a fair amount of work getting those things to work and maintaining them.

So, in the end…. Yes the unit does work. And, in my experience, even though I didn’t do any scientific measurements, works well. It’s the other issues that made it complex to maintain that caused me to go back to my bag collection.

TA-DA! It was fun to try… sigh…

-- The smell of wood, coffee in the cup, the wife let's me do my thing, the lake is peaceful.

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