Stepped scroll compressor with changing step mesh gaps

A scroll compressor comprising a fixed scroll having a spiral wall vertically provided on one side surface of an end plate, and a revolving scroll having spiral wall vertically provided on one side surface of an end plate and being supported in such a manner as to be capable of orbitally revolving while rotation is prevented by meshing the walls, wherein a stepped section is formed on the side surface of at least one of the end plates of the fixed scroll and the revolving scroll such that the height along the spiral of the walls is high at the center portion and low at the outward end, and wherein an upper edge of the other wall of the fixed scroll or the revolving scroll, corresponding to the stepped section of the end plate is divided into a plurality of sections, and has a step-like shape such that the height of the sections is low at the center portion of the spiral and high at the outward end,

• wherein the scroll compressor has a first step-mesh-gap set value (Hf) occurring between step side surfaces at a bottom of the fixed scroll and a tip of the revolving scroll and a second step-mesh-gap set value (H0) occurring between step side surfaces at a bottom of the revolving scroll and a tip of the fixed scroll, and a fixed-side set value for when the two move close together due to the revolving scroll tilting by receiving gas pressure during operation is set greater than that for when the two move apart, and
• wherein the first and second step-mesh-gap set values (Hf and H0) are set such that a step mesh gap amount (he) formed at the end of the meshing is smaller than a step mesh gap amount (hs) formed at the beginning of the meshing (hs>he), and a step mesh gap amount (h) gradually decreases from the start of the meshing to the end of the meshing.