JPS6463686A - Scroll compressor - Google Patents

Abstract

PURPOSE:To reduce power loss due to excessive compression by forming a cut-out groove about, as a center point, a contact point between the starting points of convex and concave arc parts in the scroll center section, in a scroll lap section, and by communicating thus formed cut-out groove with a discharge port in the center section of a scroll mirror plate. CONSTITUTION:A compressor section 1 is composed of stationary and rotary scroll members 5, 6 which are meshed with each other so as to form a compression chamber 7. Further, the stationary scroll member 5 is composed of a disc- like mirror plate 5a and an involute curve shape lap 5b planted upright on the mirror plate 5a, and has a center section formed therein a discharge port 10 and an outer peripheral part formed therein a suction port 16. In this arrangement, the lap 5b on, for example, the stationary scroll member 5, is formed in its center section with a cut-out groove 17 about, as a center point, the contact point between the starting points of a convex arc part 20 and a concave arc part 21. Further, the cut-out groove 17 is communicated with the discharge port 10. Thereby, in such an arrangement that the winding starting end part of the scroll lap has an arcuate shape, it is possible to reduce power loss due to excessive pressure.