Method of lubricating a scroll compressor - U.S. Patent 4,795,321
A scroll compressor is run with a clearance between the wraps and oil is injected between the wraps for sealing. In addition to providing a sealing function, the oil also provides a lubrication function prior to injection.
Etemad, Shahrokh; Yannascoli, Donald; and Hatzikazakis, Michael, "Method of lubricating a scroll compressor - U.S. Patent 4,795,321" (1989). Engineering Faculty Publications. 17.
Etemad, Shahrokh, Donald Yannascoli, and Michael Hatzikazakis. "Method of lubricating a scroll compressor." U.S. Patent 4,795,321, issued January 3, 1989.