Patent ID: 6695598
Filing Date: 2004-02-24
Classification: F04C

Abstract:
A scroll compressor comprising:a fixed scroll member having a centrifugal wall planted on its end board; a revolving scroll member having a centrifugal wall planted on its end board, wherein the revolving scroll member is combined together with the fixed scroll member in such a manner that their centrifugal walls engage with each other; and a rotation stop mechanism for supporting the revolving scroll member to revolve with respect to the fixed scroll member while preventing the revolving scroll member from performing self-rotation, wherein each of the centrifugal walls of the fixed scroll member and the revolving scroll member is designed in plan in consideration of an exterior involute starting point &bgr;1 for starting an exterior of a spiral-starting portion, an interior involute starting point &bgr;2 for starting an interior of the spiral-starting portion, and seal-off points &bgr;1â€² and &bgr;2â€² which are set between the exterior involute starting point &bgr;1 and the interior involute starting pint &bgr;2 and by which the centrifugal walls separate from each other due to revolution of the revolving scroll member, and wherein the spiral-starting portion designed for each of the centrifugal walls comprises a first non-stepped portion, formed in a first area defined between the points &bgr;1 and &bgr;1â€², in which the centrifugal wall has a constant thickness in its height direction, a second non-stepped portion, formed in a second area defined between the points &bgr;2 and &bgr;2â€², in which the centrifugal wall has a constant thickness in its height direction, and a stepped portion, formed in at least a part of a third area defined between the seal-off points &bgr;1â€² and &bgr;2â€², in which thickness of the centrifugal wall is changed in a stepped manner such that its lower side is increased in thickness compared to is upper side, whereby the centrifugal walls of the fixed scroll member and the revolving scroll member engage with each other at their first and second non-stepped portions; and wherein a first compression space is formed between the centrifugal walls of the fixed scroll member and the revolving scroll member at their innermost position and communicates with a discharge port formed at the center of the end board of the fixed scroll member due to revolution of the revolving scroll member while a second compression space is also formed outside of the first compression space, and wherein the seal-off points &bgr;1â€² and &bgr;2â€² substantially match engaging points of the centrifugal walls being established just before the second compression space moves to communicate with the discharge port during revolution of the revolving scroll member.