reciprocating compressor 1

[RECOM]

Has anybody already seen compressors with conical liners?
Can somebody explain why they make them like this.

 

[nickelkid]

Are these bores tapered? how much?

 

[RECOM]

1st stage is +-2mm taper.
2de stage more or less the same
3th stage is cilindisch.

 

[nickelkid]

I have not heard of a new cylinder bore with a taper by design. Your cylindrical 3rd stage would be what I would expect to see.

Are these new parts? who is the OEM?

 

[zdas04]

That is interesting, kind of. How in the world would the piston rings seal? How do you double act them? I guess you could taper both ends of the piston and have a cylinderical section between the two tapered sections. I just don't know why you'd do that (or how you'd get the piston out of the cylinder).

I really need to see the mfgr's slick literature on this one.

David

 

[RECOM]

those cilinders are new, manufacter is LFM from Autrich.
The piston himself is cilindrisch.
The cilinderdiameters are bigger at the suction side
1st stage 25bar 2nd stage 75 bar and the 3th stage 200bar
2de and 3th is on the same rod.

 

[nickelkid]

I think you are describing a counter bore in the cylinder, not the running bore. I have been to the LMF facilities and worked with a few of their models and am not aware of tapered running bores in any of their designs. You may want to look at the cross-sectional drawing of the cylinder assembly typically provided.

 

[ivymike]

perhaps not related to this thread, but tapered liners can be (have been) used in engines to reduce the change in ring gap size during hot running (gap changes significantly as ring moves up and down bore). The top of the bore generally expands more than the bottom, so if you add a cold-state taper you can take away som of the hot reverse taper. It's expensive to make, compared to conventional cylindrical geometry.

 

[RECOM]

We have the manual and operating books, not a sectional drawing of the compressor. I will check tommorow morning the dimensions but i think the running stroke is taper.
Is it maybe possible to provide us such a drawing. Or some body know a contact or e-mail adres of LMF facilities.

 

[nickelkid]

technic@lmf.at

Be sure to inquire with serial number, model, physical location, owner, and any other pertinent information.

The manual should indicate cylinder running bore tolerances, check them and compare to the taper.

Good luck and please update with findings.

 

[RECOM]

Thaks to you all for the help, The liner has to be cilindrisch. I do not get the drawings, but can order spare parts at a local service center in Rotterdam.

 

[nickelkid]

Recom,
Thanks for the feed back.