The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 07, 1985
Filed:
Nov. 22, 1983
Applicant:
Inventor:
Joseph W Pillis, Hagerstown, MD (US);
Assignee:
Frick Company, Waynesboro, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F01C / ; F01C / ;
U.S. Cl.
CPC ...
418 97 ; 418201 ; 417310 ;
Abstract
An automatic variable volume ratio screw compressor has a plurality of ports for the injection of liquid refrigerant into the interlobe volume. These ports communicate with the interlobe volume at different effective distances from the discharge port so that the injection of liquid refrigerant may be done at the latest possible time during compression for effective use of the refrigerant, and without risking exposure to the open discharge port. The selection of the port is done automatically in response to the instantaneous internal volume ratio.