Fixed scroll assembly and scroll compressor

A fixed scroll assembly, comprising:

• a fixed scroll component, wherein the fixed scroll component has an end plate having an inner end surface, an outer end surface and an outer peripheral surface and a vane extending from the inner end surface, and a discharge port for discharging a compressed fluid is provided in the end plate;
• at least two bypass entry sections, wherein each bypass entry section extends to the inner end surface and communicates with a compression chamber;
• piston chambers, wherein each piston chamber extends from the outer end surface of the fixed scroll component to the corresponding bypass entry section;
• bypass discharge passages, wherein each bypass discharge passage is configured to communicate the corresponding piston chamber to a low pressure region;
• pistons, wherein each piston is housed in the corresponding piston chamber and is configured to be movable between a sealing position and a released position, wherein in the sealing position, the piston covers the corresponding bypass entry section to prevent said bypass entry section from communicating with the corresponding bypass discharge passage;
• and in the released position, the piston is away from said bypass entry section to allow said bypass entry section to communicate with said bypass discharge passage;
• a connection groove, wherein the connection groove is provided on the outer end surface and configured to communicate the piston chambers with each other;
• and
• a seal assembly, wherein the seal assembly is configured to seal the connection groove.