Custom supercritical CO2 chamber with easy-to-use lid clamp----make money online

hey everyone I've done some experiments

in the past with supercritical co2 but I

always wanted an easier to use chamber

with more features to it

so in the past I've used a large pipe

fitting as the chamber itself but the

major downside is that opening and

closing the chamber requires a really

long lever arm and a lot of teflon tape

to get a good seal so I built this

chamber here out of stainless steel and

the idea was that this would be a lot

easier to open and close with minimal

tools and would allow a bit more

customization and also hopefully just

have a larger internal volume one of the

goals here was to be able to use this

style chamber by loading it with dry ice

instead of pumping in liquid co2

although as you'll see in a minute the

tops are changeable on this and so I

think I'll have another top for feeding

in high pressure liquid co2 if I ever

have it a pump hooked up to it with a

cylinder but in any case I got the idea

for this style closure from these vacuum

fittings so this is a I think called an

MW fitting and the idea is that you you

know but two of these up and then close

this clamp here and on the inside

surface there's an angle here so as you

cinch this down there's a compressive

force that keeps the o-ring in

compression so I see

that's basically what I built here on a

much larger scale so if I take this out

this comes off here and I'll show you at

the top in a minute so I've spent the

last couple weekends machining these

parts it's pretty rare that I need to

machined steel this heavy and it took me

a little while so this started off as

inch and a half thick steel plate and I

milled the profile out like this and

then I used a double angle cutter this

this was actually hard to find I got

this off of ebay and I needed to make

this this curved angular surface in here

and there aren't really too many ways to

do

that one friend suggested that I mount

it like this in the middle of 3d it

although I wanted this to be a smooth

surface and also my 3d capabilities with

my cam package aren't that good so I

ended up with this guy and just went in

here like this with a circular tool path

to to make that angled face and this all

worked really well the chamber itself is

welded so the the main bit here is

quarter-inch thick stainless steel pipe

and the bottom of it was a plug that I

machined and then welded on and in order

to make sure that my weld was going to

be okay i weld it one time and then cut

it open and checked on it to see how

much weld material I had and how good of

penetration there was so the top here

has a gland for this o-ring and I'm

using silicone o-rings just for their

temperature rating I already had one

problem in the industry this is known as

explosive decompression here so when you

have an o-ring under high pressure co2

especially because the co2 when it's

liquid or supercritical so really good

solvent it will actually penetrate into

the o-ring and then if you lower the

pressure too quickly basically by

opening the chamber this this can happen

and this destroys your o-ring so there's

also a step that sticks up the the tube

sticks out of here and interfaces with

this this cut here so when this thing is

closed it actually the reference is on

there and won't slide around them when

we're closing the clamp I anticipated

this warping when I welded it but not in

the way that it ended up working like I

was worried that it was going to kind of

go wavy like this but actually what

happened was that the entire thing kind

of folded up like this so that both of

these all of this entire perimeter here

was higher up than it started and this

is a big problem for me because I

actually cut the o-ring gland before

welding it and again I assumed that any

warpage would just be sort of

wavy kind of like this I didn't actually

think the entire thing was going to

change shape like that so I had to come

in here with a post operation after

welding it and had to clean up this face

in here and I don't know if you can see

it's still not quite perfect there's

actually a little bit of a gap here out

at the outside but luckily the geometry

there was enough slop in my there was

enough margin rather in my design where

I was able to cut this down and

everything still seals just just fine if

I had to do this again probably what I

would do is weld this first and then

chuck this whole thing up in the lathe

and do all the machining sakta after the

weld is totally cold I engineered this

chamber to work at about 3000 psi and

did the equations for the hoop stress in

the container and the the bending on the

plate on the top I had some difficulty

estimating the strength of the weld

since I didn't know how to dear ate the

material for for having been welded

there's like a heat affected zone and I

assume that the properties there are

quite a bit less trusty than the

properties in the bulk material so I

added on a good margin and figured would

be good but of course the first time I

brought this thing up to pressure I kind

of didn't want to be around so what I

did was I set it up in a far-off corner

in my shop actually behind my lathe and

set up a video camera on it and then

plugged the output valve so this is

actually a this valve here is a pressure

relief valve and even when it's cranked

all the way down it will open at about

3000 psi so what is a I actually plugged

it off so the entire thing was sealed up

and then put a heater on it and a video

camera looking at the gauge and then

went off to the other side of the shop

and looked at how much pressure I had on

a TV monitor and I took it all the way

up to 4000 psi which convinced me that

it certainly could hold three thousand

and three thousand would be just fine so

I've done one or two extractions so far

you can see the half a drop or drop of

coffee extract that I've got there

here's another tube with a little bit

more in there the volume isn't quite as

high as I would like it would be nicer

to put more material in with more dry

eyes to get a to get more product out

but the good thing about this design is

that we can make it much longer without

changing anything with the clamp or

anything like that so this this chamber

here can be arbitrarily long and all the

hoop stress is just it doesn't actually

you know we don't have to re-engineer

anything cuz we'll be using the same

piece of pipe okay well I'm sure this

will be coming up again let me know if

you have any ideas of what I should

extract with this thing okay see you

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