Patent ID: 8308448
Filing Date: 2012-11-13
Classification: F04C

Abstract:
1. A scroll compressor comprising: a compressor shell having first and second scroll members, said first scroll member having a base and a spiral wrap extending from its base; said second scroll member having a base and a spiral wrap extending from its base, said spiral wraps of said first and second scroll members interfitting to define compression chambers; a suction pressure chamber and a discharge pressure chamber within said compressor shell; a shaft for causing said second scroll member to orbit relative to said first scroll member; at least two bypass ports formed in said base of said first scroll member and communicating with at least one of said compression chambers, said at least two bypass ports communicating with respective passages leading to the suction pressure chamber within said compressor shell; a solenoid valve comprising a solenoid and a valve member movable between a reduced capacity position and a full capacity position, said valve member selectively supplying a pressurized fluid from the discharge pressure chamber to fluid valves associated with said at least two bypass ports, such that movement of the valve member can control whether the at least two bypass ports are open or closed; said solenoid being mounted onto an outer surface of said compressor shell, having electric components mounted outside of said compressor shell, and receiving an electrical connection which is mounted outside of said compressor shell, said valve member moving within said compressor shell to control the supply of pressurized fluid from the discharge pressure chamber to said fluid valves; and a bypass valve disposed in the discharge pressure chamber; wherein, upon failure of said solenoid valve, said bypass valve opens to allow the supply of pressurized fluid to the fluid valves to ensure that the fluid valves will be held in a position closing said at least two bypass ports.