Patent ID: 8539936
Filing Date: 2013-09-24
Classification: F02B,F04D

Abstract:
1. An engine system comprising: an engine; an engine intake manifold providing a flow of compressed air into the engine; a screw type supercharger having a pressure differential equalization system and being in fluid communication with the engine intake manifold providing the flow of compressed air into the intake manifold; an inlet end of the screw type supercharger receiving ambient air; an outlet end of the screw type supercharger opposite the inlet end of the screw type supercharger; a path through an interior of the screw type supercharger for the ambient air from the inlet end of the screw type supercharger to the outlet end of the screw type supercharger with increasing pressure and temperature as the ambient air is compressed along the path to produce the flow of compressed air; an outlet end wall at the outlet end of the supercharger; rotor shafts; rotor shaft bearings residing between the rotor shafts and the outlet end wall and providing for rotation to the rotors with respect to the outlet end wall; rotor gears attached to the rotor shafts and residing in a gear space separated from the interior of the screw type supercharger by the outlet end wall; flow restrictive seals extending radially between rotor shafts and the outlet end wall, the flow restrictive seals reducing a flow of the compressed air from the supercharger interior into the gear space; rotor shaft seals between the flow restrictive seals and the rotor shaft bearings; annular spaces between the flow restrictive seals and the rotor shaft seals; and a pressure vent connecting the annular spaces to ambient air pressure.