Scroll compressor

A scroll compressor comprising:

• a housing;
• a rotary shaft rotatably supported by the housing;
• a motor configured to rotate the rotary shaft;
• a controller configured to control driving of the motor;
• a compression mechanism driven by the motor and configured to compress refrigerant;
• the compression mechanism including:
• a fixed scroll that includes a fixed scroll base plate having a disk shape, and a fixed scroll spiral wall extending from the fixed scroll base plate;
• and
• an orbiting scroll that includes an orbiting scroll base plate having a disk shape and facing the fixed scroll base plate, and an orbiting scroll spiral wall extending from the orbiting scroll base plate and meshing with the fixed scroll spiral wall, the orbiting scroll and the fixed scroll cooperating to compress refrigerant with rotation of the rotary shaft;
• an eccentric shaft extending from the rotary shaft at a position eccentric to an axial line of the rotary shaft, the eccentric shaft extending parallel to the axial line of the rotary shaft;
• and
• a bushing mounted on the eccentric shaft and swingable about the eccentric shaft, the bushing swinging about the eccentric shaft to change an orbital radius of the orbiting scroll, wherein
• the controller performs a startup operation to discharge liquefied refrigerant from the compression mechanism before performing a normal operation in which the motor is driven at a command rotational speed, and
• in the startup operation,
• the controller performs a startup reverse rotation in which the motor rotates in reverse and the bushing swings to reduce the orbital radius of the orbiting scroll so that a gap between the fixed scroll spiral wall and the orbiting scroll spiral wall is increased,
• the controller performs a startup forward rotation, after the startup reverse rotation, in which the motor rotates forward while an acceleration in a rotational speed of the motor is reduced as compared to the acceleration in the rotational speed in the startup reverse rotation to maintain a posture of the bushing, and
• the controller performs a startup liquid discharge, when the rotational speed of the motor reaches a predetermined rotational speed by performing the startup forward rotation, in which the motor is driven at the predetermined rotational speed to cause the orbiting scroll to make orbital motion so that the liquefied refrigerant is discharged from the compression mechanism.