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Home Brew Forums > Home Brewing Beer > DIY Projects > Other > Cake pan + skateboard wheel + bike brakes = homemade peristaltic pump??
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Old 11-06-2011, 04:19 AM   #1
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Default Cake pan + skateboard wheel + bike brakes = homemade peristaltic pump??

In my efforts to build an electric HERMS system I decided to attempt to build my own pumps . I was really intrigued by peristaltic pumps due to their ability to work in reverse, self prime, meter (dose), and ease of cleaning/sanitizing. I didn't want to post anything on my pump design until I had a successful trial run of the first build... that time has come so here goes:



The base design is a 360 eccentric peristaltic that uses a single roller to move the fluid in either direction by squeezing a silicone tube.

The major components of the pump head are:
1. 9" round spring-form cake pan
2. Long-board skateboard wheel and bearings
3. 160mm mountain bike brake discs
3. Bolts, nuts, and washers from McMaster

I built the design in 3D first to provide an initial validation that this thing might stand some sort of chance of actually working.



The skateboard wheel is mounted to a hub created by bolting together a couple of standard mountain bike brake discs.



The wheel rotates and squeezes the tubing causing the fluid to be pumped. The distances of the wheel from the outer wall can be changed due to the slots cut in the brake discs.



The back is ready to have a motor (going down the path of a large computer controlled stepper) mounted to it.



Should end up looking something like this with additional mounting hardware:



Ran the pump tonight using my cordless drill as a temporary motor and it worked really well. Moved roughly half a standard ale pale worth of water to a second pale in around a minute, and then transferred it all back to the original. My system design calls for two of these pumps so once I hash out all the small details I will build a second one.


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Old 11-06-2011, 04:37 AM   #2
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beautiful


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Old 11-06-2011, 04:40 AM   #3
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Why not add 2 more wheels?
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Old 11-06-2011, 04:45 AM   #4
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Quote:
Originally Posted by BetterSense View Post
Why not add 2 more wheels?
Each wheel occludes the tube, providing slightly less pumping capacity and, more importantly, creates additional friction wear on the tubing. With the 360 eccentric design only one roller is needed to maintain suction.
At some point once I finish getting an actual motor connected to this I want to test the longevity of the tubing so I can make plans to replace it on a regular schedule rather than have a failure in the middle of a brew.
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Primaries: Air
Secondaries: Lakefront India Brown Ale

On Tap 1: Rootbeer, On Tap 2: NB White ouse Honey Ale, On Tap 3: Nitrogen, On Tap 4: Air, On Tap 5: Air
On Deck: DIPA, Imp Stout, Porter, Wheat, Black IPA

"No sense having empty carboys around when full ones take up just as much space. " - Me
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Old 11-06-2011, 04:51 AM   #5
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Quote:
Originally Posted by Tinga View Post
beautiful
says it all. great work.
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Old 11-06-2011, 04:56 AM   #6
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I love it!

to build one of these pumps what kind of cost are you looking at?

found this video, idea seems similar:
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Old 11-06-2011, 05:03 AM   #7
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How much did the brake discs cost you and where did you get them?
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Old 11-06-2011, 05:07 AM   #8
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That's really cool! I would've never thought of doing something like this. I'd love to see a video of yours in action when you're completely satisfied with it.
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Old 11-06-2011, 05:31 AM   #9
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Sourced nearly everything from McMaster or eBay. The pan itself was from Sears, figured I would mess something up during the build so I went with a local source on that.

Here is the current BOM:

The stepper motors and controllers should end up costing about $150 for each pump so these two won't be all that cheap. It should be possible to hook the pump head up to a much cheaper AC or DC motor but I really want the control provided by a large stepper.
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Primaries: Air
Secondaries: Lakefront India Brown Ale

On Tap 1: Rootbeer, On Tap 2: NB White ouse Honey Ale, On Tap 3: Nitrogen, On Tap 4: Air, On Tap 5: Air
On Deck: DIPA, Imp Stout, Porter, Wheat, Black IPA

"No sense having empty carboys around when full ones take up just as much space. " - Me
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Old 11-06-2011, 08:24 AM   #10
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Lookin great TFB. Nice use of parts!

Are you planning to use your uController from your HERMS build to provide motor control? Hoping to build you're own bridge?


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