Oil-free compressor piston/ring design 1

[lengould]

I'm working on designing a piston / cylinder / ring assembly for a large (eg. up to 6" bore) medium-high-pressure (eg. 30 bar) compressor requirement.

Anyone know of available technology capable of doing this (eg. rings).

Alternatively, looking for someone capable of designing this. Payment available to right qualifications, remote working fine.



Pechez les vaches.

 

[sms]

Not sure what your asking, but if you google reciprocating compressor parts you should find plenty of suitable ring materials...

-The future's so bright I gotta wear shades!

 

[sms]

BTW PTFE and PEEK are the typical materials used in oil free service.

-The future's so bright I gotta wear shades!

 

[randi]

Rulon has also been mentioned for some high temperature and non-lubricated applications. Perhaps Chemloy may also be investigated. Magazines like "Assembly Engineering" or "Material Engineering" have carried ads. of such materials from time to time, in the past.

 

[quark]

Graphited teflon is what I know uptoo 10 barg for both piston and guide rings. No problems as long as jacket cooling is good.

 

[dcasto]

These people should fix you up.

http://www.cleecook.com/

In my industry we do up to 36" cylinders and I've seen pressures as high as 2400 psig with non lubricated pistons incorporating rider bands.

 

[lengould]

Thanks all, especially dcasto, who's tip earns a star.

Pechez les vaches.

 

[Cheddarcaveman]

PEEK is the first material that comes to mind for non lubricated rings/parts in any service.
Somehow you seem to be trying to re-invent the wheel! There are dozens of companies out there already manufacturing such compressors.

 

[iainuts]

Try:
Morgan

http://www.mamat.com/

Hoerbiger

http://www.mamat.com/

CPI

http://www.compressor-products.com/

(I think CPI and C Lee Cook have merged now, not sure)

Before the internet we used Thomas Register which is now online.
Thomas Net

http://www.thomasnet.com/prodsearch.html?cov=NA&which=prod&what=piston+ring&navsec=search

 

[WoodyPE]

I used to work at Bristol Compressors. They were looking into a crimped expander ring design the last time I was with them. It expanded to fit. Without wear rings, the piston/cylinder clearances must be in tenths of a thousandth of an inch to prevent blow-by. It seems teflon has really good friction and temperture properties. My 2 cents anyway. I wasn't in R&D.