Scroll compressor including fixed and orbiting scrolls having different heights and surface hardenings

A scroll compressor comprising:

• a fixed scroll comprising a spiral-shaped wall portion disposed in an upright manner on a side surface of an end plate;
• an orbiting scroll comprising a spiral-shaped wall portion disposed in an upright manner on a side surface of an end plate, the orbiting scroll being supported in a manner capable of orbiting motion with the two wall portions meshing while being prevented from self rotation;
• a discharge port through which a fluid compressed by the two scrolls is discharged;
• an end plate step portion provided on the end plate of one of the two scrolls formed on the side surface so that a height of the end plate is higher on a center portion side in the direction of a spiral of the wall portion and lower on an outer end side;
• and
• a wall portion step portion provided on the wall portion of the other of the two scrolls that corresponds to the end plate step portion so that a height of the wall portion is lower on a center portion side of a spiral of the wall portion and higher on an outer end side;
• wherein
• both of the scrolls are treated for surface hardening, with the scroll on which the end plate step portion is provided being treated to have a harder surface than that of the other scroll.

A scroll compressor comprising:

• a fixed scroll comprising a spiral-shaped wall portion disposed in an upright manner on a side surface of an end plate;
• an orbiting scroll comprising a spiral-shaped wall portion disposed in an upright manner on a side surface of an end plate, the orbiting scroll being supported in a manner capable of orbiting motion with the two wall portions meshing while being prevented from self rotation;
• a discharge port through which a fluid compressed by the two scrolls is discharged;
• an end plate step portion provided on the end plate of both of the two scrolls formed on the side surfaces so that a height of the end plate is higher on a center portion side in the direction of a spiral of the wall portions and lower on an outer end side;
• and
• a wall portion step portion provided on the wall portion of both of the two scrolls that corresponds to the end plate step portions so that a height of the wall portions is lower on a center portion side of the spiral and higher on an outer end side;
• wherein
• the end plate step portion of one of the scrolls and the end plate step portion of the other of the scrolls have different heights;
• and
• both of the scrolls are treated for surface hardening, with the scroll comprising the highest end plate step portion being treated for surface hardening to have a harder surface than that of the other scroll.