Patent ID: 7674098
Filing Date: 2010-03-09
Classification: F04C

Abstract:
1. A scroll compressor comprising: a first scroll member having a base and a generally spiral wrap extending from its base; a second scroll member having a base and a generally spiral wrap extending from its base, the base of said first and second scroll members interfitting to define compression chambers, said second scroll member being driven to orbit relative to said first scroll member; a suction line for communicating refrigerant into a compressor shell for said compressor, and a discharge line for communicating refrigerant outwardly of said shell; an economizer injection line for injecting a vapor refrigerant back into the compression chambers from an economizer circuit, said economizer injection line passing through said base of said first scroll member and communicating with at least one economizer port for injecting the vapor refrigerant into said compression chambers; and an unloader line for selectively communicating said economizer injection line back to said suction line, said unloader line being associated with an unloader valve, and at least one unloader port being provided in said first scroll member and when said unloader valve is opened, to communicate refrigerant from said compression chambers through said unloader port, into said economizer injection line, into said unloader line and to said suction line, said unloader port and said economizer port being distinct ports, and, when said unloader valve is open, refrigerant passing from said compression chambers, through said unloader port, and through said economizer port, and into said unloader line, but refrigerant not passing into said compression chambers through said unloader port when said economizer injection line is passing refrigerant into said compression chambers.