ROTARY-PISTON DIESEL ENGINE SUPERCHARGERS

摘要

In a supercharging system for Diesel rotary-piston engines comprising a turbosupercharger and a volumetric supercharger, means are provided for drawing air downstream of the volumetric supercharger and utilizing this tapped air in an air pump also receiving the air having passed through the engine radiator, a needle valve responsive to the supercharging pressure controlling the delivery of drawn air into the neck of a convergent divergent section of said pump, this drawn air being also adapted to be injected into the exhaust pipe of the turbine of said turbosupercharger which receives the exhaust gas from the engine, said exhaust pipe being connected in turn to the interior of another pump mounted in the radiator cooling air duct, a needle valve being inserted in the pipe delivering the air derived downstream of said volumetric supercharger, in order to improve the efficiency of the system by reducing the counter-pressure upstream of the exhaust turbine while improving the drawn air output and therefore the air-pump throughput and the engine radiator cooling air output, said needle valve being responsive to this end to a spring-loaded bellows responsive in turn to the supercharging pressure.