Turbine-compressor unit with means for preventing oil leakage

Abstract From the Canadian patent

In a centrifugal compressor unitized with a turbine to provide a turbosupercharger or the like the width of an annular, throat through which a gas accelerated by an impeller passes into a spiral outlet passage is made less than the peripheral width or depth of the passages formed in the impeller. The development of negative pressure at the back of the impeller under various operating conditions is thus minimized, so that lubricating oil in the turbine-compressor unit can be substantially prevented from leakage by suction.