oldham coupling(ring) in scroll compressor

[refrigeng]

Hi
1.what does the oldham coupling do in scroll compressors?
2.can anyone explain me about sliding unloader bushing that used in compliant scroll compressors? please upload a picture of unloader bushing.

please answer me with simple words, my english isn't very good
thank you

[monkey spanners]

Hi, I didn't know that those were called oldham couplings! The oldham coupling allows the moving scroll to orbit the stationary scroll without the moving scroll being able to rotate.

I believe the unloader works by allowing the scrolls to lift apart so that the compressors stops pumping.

There are a lot of videos on youtube that show how they work,

https://www.youtube.com/watch?v=YNeoFebbU6I