Scroll compressor

A scroll compressor, comprising:

• a casing having a hermetic inner space divided into a low-pressure portion and a high-pressure portion;
• an orbiting scroll coupled to a rotary shaft in the inner space of the casing to perform an orbiting motion;
• a non-orbiting scroll forming compression chambers, each having a suction pressure chamber, an intermediate pressure chamber, and a discharge pressure chamber, together with the orbiting scroll;
• a back pressure chamber assembly coupled to the non-orbiting scroll to form a back pressure chamber;
• a first variable-capacity unit configured to vary a compression capacity by selectively providing communication between a first intermediate pressure chamber having a first pressure, of the intermediate pressure chambers, and the low-pressure portion;
• and
• a second variable-capacity unit configured to vary the compression capacity by selectively providing communication between a second intermediate pressure chamber having a second pressure higher than the first pressure, of the intermediate pressure chambers, and the low-pressure portion, wherein the first variable-capacity unit comprises a first variable-capacity passage that communicates with the first intermediate pressure chamber, at least one first variable-capacity valve that opens and closes the first variable-capacity passage, and a first variable-capacity opening and closing valve that controls opening and closing of the at least one first variable-capacity valve, wherein the second variable-capacity unit comprises a second variable-capacity passage that communicates with the second intermediate pressure chamber, at least one second variable-capacity valve that opens and closes the second variable-capacity passage, and a second variable-capacity opening and closing valve that controls opening and closing of the at least one second variable-capacity valve, wherein the first variable-capacity control valve and the second variable-capacity control valve are disposed on an outer circumferential surface of the casing, and a first connecting portion is connected between the first variable-capacity opening and closing valve and the first variable-capacity control valve, and a second connecting portion is connected between the second variable-capacity opening and closing valve and the second variable-capacity control valve.