[PSUBS-MAILIST] Oil Compensator

[Alan James via Personal_Submersibles]

 Hi Psubbers,Hank got me thinking when he built his compensator from a pneumatic cylinder.   Attached is a design based on how I think the commercial compensators work.It seems a great project for a 3D printer. The size for a 300ml version would be roughly 10" x 6" (250mm x 150mm) excludingthe rod. The 10" height would be in 2 sections with the tallest being 6" (thinking of printing height)   The rolling diaphragm has a flange that is clamped between the two haves of the body& rolls down inside itself as the oil is depleted & it is a mirror image of it's full state.It will hit the micro switch to trigger a low oil warning. Also the rod will retract giving anexternal oil level indication.    Commercial compensators offer pressure ranges above ambient; for instance 4-8psi.This is because the spring has more power in it's compressed state than extended state.I think the final design will be dictated by suitable 316 stainless springs & availablesizes of rolling diaphragms. Haven't found any diaphragms locally but there are heapsin China.Alan
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20170221/5e4fae3b/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: compensator.jpg
Type: image/jpeg
Size: 218804 bytes
Desc: not available
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20170221/5e4fae3b/attachment-0001.jpg>