Scroll compressor with improved sealing performance of back pressure chamber

A scroll compressor, configured to compress a medium, comprising a movable scroll and a fixed portion, the movable scroll cooperating with the fixed portion, the fixed portion having a first bearing surface, the movable scroll having a second bearing surface;

• wherein the scroll compressor comprises a back pressure chamber located between the movable scroll and the fixed portion;
• at least one of the movable scroll and the fixed portion is provided with a groove disposed on a periphery of the back pressure chamber;
• the scroll compressor further comprises a sealing assembly at least partially installed in the groove;
• one end of the sealing assembly is in contact with a groove bottom surface in the groove;
• another end of the sealing assembly at least partially located in the groove of the movable scroll is in contact with the first bearing surface of the fixed portion, and/or another end of the sealing assembly at least partially located in the groove of the fixed portion is in contact with the second bearing surface of the movable scroll;
• the sealing assembly comprises a wear-resistant ring and an elastic ring;
• the groove comprises an inner annular surface and an outer annular surface along the width direction of the groove;
• a diameter of the outer annular surface is larger than a diameter of the inner annular surface;
• a space is formed between the wear-resistant ring and the inner annular surface of the groove;
• the back pressure chamber is configured to be in communication with the groove via the space;
• the wear-resistant ring and the elastic ring are at least partially stacked along a depth direction of the groove;
• the width direction of the groove is perpendicular to the depth direction of the groove;
• and
• the elastic ring is provided with at least one recess on a surface thereof;
• the at least one recess comprises a first recess;
• the first recess is in communication with the back pressure chamber via the space;
• when the first recess is subjected to pressure from the back pressure chamber through the space, a pushing force is generated through the medium;
• the pushing force acts on the elastic ring and expands the elastic ring;
• the elastic ring is then driven by the pushing force to more tightly contact with the groove bottom surface and the wear-resistant ring.