FIELD: turbomachines or compressors with annular disk chamber connected to them. SUBSTANCE: scroll region next to initial region has circular cross-sectional areas until definite diameter DA=Dv is attained. After that, cross-sectional areas of scroll case increase only in axial direction. Annular disk chamber is arranged in axial direction asymmetrically relative to cross-section of scroll flow. Diameter of main circumference of scroll case is approximately constant. EFFECT: improved efficiency at relatively low cost. 4 cl, 8 dwg
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