Scroll compression device

A scroll compression device, characterized in that

• a scroll compression mechanism for compressing refrigerant and a driving motor that is connected to the scroll compression mechanism through a driving shaft and drives the scroll compression mechanism are accommodated in a casing,
• the scroll compression mechanism is supported in the casing by a main frame,
• a stator of the driving motor is directly or indirectly supported in the casing,
• the driving shaft is connected to a rotor of the driving motor and the driving shaft is supported in the casing by a bearing plate,
• an upper balancer formed of magnetic material is secured onto the shaft above the stator of the driving shaft, a lower balancer formed of non-magnetic material is secured to a lower end of the rotor by swaging to the rotor with rivets that penetrate vertically through the rotor, and an auxiliary balancer formed of non-magnetic material is secured in a gap between an upper end of the rotor and the upper balancer with at least some of the rivets,
• the auxiliary balancer is configured in a semi-circular shape while the center thereof is located at the shaft center of the driving shaft, and the inner peripheral side is cut out in the peripheral direction so as to avoid the driving shaft,
• the lower balancer has a shaft hole in which the driving shaft is inserted, and plural fixing holes in which the rivets are respectively inserted to each hole, and the lower balancer has a large-diameter portion that is provided positionally symmetrically with the auxiliary balancer, and at least two small-diameter portions that have at least some of the fixing holes, and
• the auxiliary balancer is secured to the rotor with said at least some of the rivets which penetrate through said at least some of the fixing holes disposed in each of the small-diameter portions.