Patent ID: 6273691
Filing Date: 2001-08-14
Classification: F04C

Abstract:
A scroll gas compressor comprising:a spiral fixed scroll wrap on one side of a panel board serving as a part of a fixed scroll is engaged with a revolving scroll wrap on a wrap support disk serving as a part of a revolving scroll and having a shape similar to said fixed scroll forming a pair of spiral symmetric compression spaces between the two scrolls;a discharge port communicating with a discharge chamber for the central portion of said fixed scroll wrap;a suction chamber for the outside of said fixed scroll wrap;a scroll compression mechanism comprising a plurality of divided compression chambers in which each compression space is continuously movable toward a discharge side from a suction side and its volume varies to compress a fluid when said revolving scroll revolves around said fixed scroll through a rotation preventive member;said fixed scroll and said revolving scroll comprise materials having different thermal expansion coefficients; andsaid panel board including two pairs of bypass holes, each hole having an end opening into a compression chamber for performing compression near an outlet of said discharge port, and each hole having a second end communicating with said discharge chamber, wherein each of the two pairs of bypass holes includes first and second holes that are asymmetrically arranged with respect to the center of said panel board, and both of the first and second holes of each of the two pairs of bypass holes are closable substantially simultaneously by said revolving scroll wrap.