Scroll compressor with back pressure chamber and back pressure passages

A scroll compressor, comprising:

• a casing in which a sealed inner space is divided into a suction space and a discharge space;
• an orbiting scroll that performs an orbiting movement in the inner space of the casing;
• a non-orbiting scroll engaged with the orbiting scroll to form a pair of compression chambers between the orbiting scroll and the non-orbiting scroll;
• a back pressure chamber assembly coupled to the non-orbiting scroll to form a back pressure chamber so as to support the non-orbiting scroll toward the orbiting scroll;
• a first back pressure passage that connects a first intermediate pressure chamber in the pair of compression chambers and the back pressure chamber;
• a second back pressure passage that connects a second intermediate pressure chamber in the pair of compression chambers and the back pressure chamber,
• the second intermediate pressure chamber having a higher pressure than the first intermediate pressure chamber;
• and
• a back pressure control valve configured to selectively open and close the first back pressure passage and the second back pressure passage according to an operation mode, wherein the back pressure control valve moves to a first position at which the first back pressure passage is open and the second back pressure passage is closed in a power operation, and moves to a second position at which the first back pressure passage is closed and the second back pressure passage is open in a saving operation, wherein a capacity variable bypass hole that bypasses refrigerant in the intermediate pressure chambers is formed in the back pressure chamber assembly or the non-orbiting scroll, wherein a discharge passage that communicates with the capacity variable bypass hole to discharge the bypassed refrigerant to the inner space of the casing is formed in the back pressure chamber assembly or the non-orbiting scroll, and wherein a capacity control valve that selectively opens and closes the discharge passage while being operated in connection with the back pressure control valve is provided in the back pressure chamber assembly or the non-orbiting scroll.