Scroll compressor

A scroll compressor comprising:

• a rotating shaft body that is installed in a housing and rotates around an axis of the housing;
• a movable scroll revolving around an eccentric shaft integrated with the rotating shaft body to revolve around the axis at a position eccentric to an axis of the rotating shaft body;
• and
• a fixed scroll fixed to the housing;
• and
• bearings that slidably support the rotating shaft body and the eccentric shaft, the bearings being installed within the housing,
• wherein
• at least one of the bearings is a sliding bearing including
• a back metal, and
• a sliding layer formed on the back metal by baking, the sliding layer includes
• 5 to 60 wt % of graphite including particles,
• with a balance of at least one of polyamide-imide resin and polyimide resin,
• the particles has
• an average diameter of 5 to 50 μm,
• a graphitization degree of 0.6 or more, and
• 50% or more of the particles in a number ratio have a particle ratio more than or equal to 0.5, the particle ratio being a ratio between a graphite minor axis and major axis.

A scroll compressor comprising:

• a rotating shaft body that is installed in a housing and rotates around an axis of the housing;
• an eccentric shaft integrated with the rotating shaft body so as revolve around the axis at a position eccentric with respect to a shaft axis of the rotating shaft body;
• a movable scroll fixed to the eccentric shaft;
• a fixed scroll fixed to the housing;
• a shaft body bearing slidably supporting the rotating shaft body, and
• an eccentric bearing slidably supporting the eccentric shaft,
• wherein
• at least one of the shaft body bearing and the eccentric bearing is a sliding bearing including
• a back metal, and
• a sliding layer formed on the back metal by baking,
• the sliding layer includes
• 5 to 60 wt % of graphite including particles,
• with a balance of at least one of polyamide-imide resin and polyimide resin,
• the particles has
• an average diameter of 5 to 50 μm,
• a graphitization degree of 0.6 or more,
• an average shape factor YAVE of 1.2 to 3.0,
• 70% or more of the particles in a number ratio have a shape factor Y of 1 to 1.5,
• the average shape factor YAVE is defined by
• YAVE=SUM[{PMi2/4πAi}]/i
• fine particles with less than or equal to 0.5 times of the average diameter are not considered in calculating YAVE,
• the shape factor Y is defined by
• Y=PM2/4πA
• PM denotes a periphery length of a single particle,
• A denotes a cross-sectional area of a single particle,
• i denotes number of measured particles, and
• SUM denotes a summation of formulas in [ ] for i particles.

A scroll compressor comprising:

• a rotating shaft body that is installed in a housing and rotates around an axis of the housing;
• an eccentric shaft connected to the rotating shaft body to revolve around the axis at a position eccentric to an axis of the rotating shaft body;
• a movable scroll fixed to the eccentric shaft;
• a fixed scroll fixed to the housing;
• a shaft body bearing slidably supporting the rotating shaft body, and
• an eccentric bearing slidably supporting the eccentric shaft,
• wherein
• at least one of the shaft body bearing and the eccentric bearing is a sliding bearing including
• a back metal, and
• a sliding layer or graphite additive resin-based sliding part formed on the back metal by baking,
• the sliding layer includes
• 5 to 60 wt % of graphite including particles,
• with a balance of at least one of polyamide-imide resin and polyimide resin, the particles have
• an average diameter of 5 to 50 μm,
• a graphitization degree of 0.6 or more,
• an average shape factor YAVE of 1.2 to 3.0,
• 70% or more of the particles in a number ratio have a shape factor Y of 1 to 1.5,
• the average shape factor YAVE is defined by
• YAVE=SUM[{PMi2/4πAi}]/i
• fine particles with less than or equal to 0.5 times of the average diameter are not considered in calculating YAVE,
• the shape factor Y is defined by
• Y=PM2/4πA
• PM denotes a periphery length of a single particle,
• A denotes a cross-sectional area of a single particle,
• i denotes number of measured particles, and
• SUM denotes a summation of formulas in [ ] for i particles.