Patent ID: 7425114
Filing Date: 2008-09-16
Classification: C23C,F01D,F02C,F04D,F16J

Abstract:
1. A shaft seal in a transmission expander or compressor, wherein the transmission expander or compressor has at least one rotor rotatably arranged in a housing, said at least one rotor being arranged in a floating arrangement on an output shaft, said shaft seal comprising a seal arrangement connected to the housing sealing the rotor, said seal arrangement comprising: seal tips arrangeable on one of the shaft or a hub of the rotor, said seal tips being arranged in three seal sections which lie behind one another between an area in the interior of the transmission expander or compressor and the ambient atmosphere surrounding the transmission expander or compressor; a stationary sealing ring surrounding said seal tips and defining two annular chambers, each annular chamber being arranged between two adjacent ones of said seal sections, said sealing ring comprising a sealing face which lies opposite said seal tips and includes a break-in coating; a feed connected to the one of the annular chambers arranged closer to the interior of the transmission expander or compressor, said feed arranged for feeding a sealing gas at a pressure higher than the pressure in the interior of the transmission expander or compressor; and an extractor connected to the one of the annular chambers arranged farther away from the interior of the transmission expander or compressor for extracting the sealing gas from said seal arrangement.