Patent ID: 6231316
Filing Date: 2001-05-15
Classification: F04C

Abstract:
A scroll-type variable-capacity compressor comprising:a fixed scroll including a flat base plate and a spiral wall formed to protrude from said base from said base plate;a movable scroll including a flat base plate and a spiral wall formed to protrude from said base plate, said movable scroll engaging said fixed scroll thereby to form at least a pair of compression chambers opposite to each other;an intake pressure chamber formed as a spacing outside of said movable scroll for supplying a compressing gas into said pair of compression chambers;a discharge port formed at the central portion of said fixed scroll for discharging the gas compressed in said pair of said compressor chambers;a first bypass port arranged in said base plate of said fixed scroll and adapted to establish the communication between one of said pair of compression chambers and said intake pressure chamber;a second bypass port arranged in said base plate of said fixed scroll and adapted to establish the communication between the other one of said pair of compression chambers and said intake pressure chamber; anda valve spool configured for opening and closing said first bypass port and said second bypass port simultaneously;wherein said first bypass port is formed at a position adjacent to the inner surface of said spiral wall of said fixed scroll within an area on said base plate of said fixed scroll which is closed by said spiral wall of said movable scroll only after said one of said pair of compression chambers is reduced to a predetermined capacity, and said second bypass port is formed at a position on the side beyond said discharge port from said first bypass port within said area closed by said spiral wall of said movable scroll only after said other one of said pair of compression chambers is reduced to said predetermined capacity, said second bypass port being set in such a position that a line connecting said first bypass port and said second bypass port is displaced from said discharge port.