Scroll compressor

A scroll compressor comprising:

• a casing;
• a high/low pressure separation plate that is fixed inside the casing and divides the inside of the casing into a low-pressure part forming a suction space and a high-pressure part forming a discharge space;
• a main frame that is fixed inside the casing and disposed in the low-pressure part;
• an orbiting scroll that is supported on the main frame in an axial direction to perform an orbital motion;
• a non-orbiting scroll that is movable in the axial direction with respect to one side surface of the main frame with the orbiting scroll disposed therebetween, and forms a compression chamber together with the orbiting scroll;
• a back pressure chamber assembly that is disposed between the high/low pressure separation plate and the non-orbiting scroll and comprises a back pressure chamber formed in an annular shape;
• and
• a back pressure hole that is disposed in the non-orbiting scroll and the back pressure chamber assembly, such that the compression chamber and the back pressure chamber communicate with each other, and
• wherein a back pressure valve is disposed inside the back pressure hole, the back pressure valve moving along a longitudinal direction of the back pressure hole due to a pressure difference between the compression chamber and the back pressure chamber to vary a passage area of the back pressure hole.