Patent ID: 8500424
Filing Date: 2013-08-06
Classification: F04C

Abstract:
1. Screw compressor comprising an outer housing, a compressor screw housing arranged in the outer housing, rotor bores for screw rotors being arranged in said compressor screw housing, a drive arranged in the outer housing on a side of the compressor screw housing located opposite the drive, a bearing housing arranged in the outer housing on a side of the compressor screw housing located opposite the drive, and a sound damping device arranged within the outer housing in a first interior space, the first interior space being an interior space of said outer housing, the compressed working medium flowing through the sound damping device and when exiting from said sound damping device entering said first interior space of said outer housing, the sound damping device guiding the compressed working medium by means of a flow guide, the flow guide enclosing a second interior space, the second interior space being an internal space of said sound damping device, the compressed working medium being guided as a circulating flow circulating around an axis and wherein lubricant is separated from the circulating flow of the working medium as a result of centrifugal forces being in the area of the flow guide, the flow guide comprising an inner wall surface enclosing the second interior space, the separation of lubricant taking place at said inner wall surface, the flow guide having openings for the lubricant, the flow guide being covered with a material pervious to lubricant in the area of the openings on an exterior wall surface of the flow guide, the exterior wall surface being on an opposite side of flow guide relative to the inner wall surface, the material pervious to lubricant is a material preventing any working medium flowing through.