Scroll compressor having a capacity variable device

A scroll compressor, comprising:

• a casing having an inner space;
• a first scroll provided inside the casing, the first scroll being an orbiting scroll;
• a second scroll provided inside the casing, the second scroll being a non-orbiting scroll;
• a back pressure chamber assembly provided at a rear surface of the second scroll to form a back pressure chamber that is configured to pressurize the second scroll toward the first scroll;
• a compression unit provided in the inner space of the casing to form a compression chamber that is composed of an inner pocket and an outer pocket that are formed by the first and second scrolls;
• a plurality bypass holes provided in the compression unit to vary compression capacity of the scroll compressor, the plurality bypass holes comprise an inner first bypass hole and an inner second bypass hole formed in the inner pocket of the compression chamber and an outer first bypass hole and an outer second bypass hole formed in the outer pocket of the compression chamber, the inner first bypass hole and the inner second bypass hole are spaced apart from each other along a movement path of the inner pocket, and wherein the outer first bypass hole and the outer second bypass hole are spaced apart from each other along a movement path of the outer pocket;
• a first valve assembly provided in the back pressure chamber assembly, and having a fist bypass valve that opens and closes the inner first bypass hole and the outer second bypass hole together, and a second bypass valve that opens and closes the inner second bypass hole and the outer first bypass hole together, and
• a second valve assembly provided outside the casing and selectively opening and closing the first inner and outer bypass holes and the second inner and outer bypass holes using the first valve assembly according to an operation mode,
• wherein the second valve assembly is coupled to a connection portion coupled through the casing so as to transfer refrigerant in the back pressure chamber into the first valve assembly or transfer the refrigerant in the first valve assembly into the inner space of the casing,
• wherein the connection portion comprising:
• a first connection pipe having one end connected to a first inlet and outlet of the second valve assembly and the other end passing through the casing to communicate with the back pressure chamber;
• a second connection pipe having one end connected to a second inlet and outlet of the second valve assembly and the other end penetrating through the casing to communicate with the inner space of the casing;
• and
• a third connection pipe having one end connected to a third inlet and outlet of the second valve assembly and the other end penetrating through the casing to communicate with the first valve assembly.