Patent ID: 6746224
Filing Date: 2004-06-08
Classification: F04C

Abstract:
A scroll compressor comprising:a fixed scroll having a spiral wall upstanding on one side face of an end plate, and secured in place; an orbiting scroll having a spiral wall upstanding on one side face of an end plate, and supported so as to be orbitally movable while being prevented from rotation, with pairs of said walls engaged with each other; a stepped portion on one side face of at least one of the end plates of said fixed scroll and said orbiting scroll, having a high part with a height thereof which is high at a central side in a spiral direction, a low part with a height thereof which is low at an outer peripheral end side, and a step which constitutes a border of these high and low parts; and a stepped shape formed by dividing an upper rim of the wall of at least one of said fixed scroll and said orbiting scroll into a plurality of parts which are corresponding to said stepped portion, having a low upper rim where the height of the part is low at a central side in the spiral direction, and a high upper rim where the height of the part is high at an outer peripheral end side in the spiral direction; wherein a gap is provided between said end plate and a corresponding upper rim of said wall of at least one of said fixed scroll and said orbiting scroll, and a height of said gap in a height direction of said wall at room temperature is formed higher than a height for a case where said wall is thermally expanded in a height direction of said wall at a time of scroll compressor operation, and the height of said gap formed on the central side in the spiral direction from said stepped portion is formed higher than the height of said gap formed on the outer peripheral end side from said stepped portion.