Can realize turbo charger structure of single -stage, two -stage pressure boost

An object of the utility model is to provide a can realize turbo charger structure of single -stage, two -stage pressure boost, including turbine, compressor, the compressor includes impeller A and impeller B, and impeller A is continuous through import gas circuit I and atmosphere, to compressor inside entrain, connect switching control valve I after impeller A's export gas circuit I, I back gas circuit on the switching control valve divides into two the tunnel: one of them gas circuit links to each other with intercommunication gas circuit I, and another gas circuit links to each other with intercommunication gas circuit II, impeller B's imported gas circuit II on switching control valve II is equipped with, switching control valve II is connected with two gas circuits respectively: one of them strip links to each other with intercommunication gas circuit I, link to each other with the atmosphere in another gas circuit, impeller B's export gas circuit II link to each other with intercommunication gas circuit II converge into a gas circuit after, link to each other with the intake pipe of internal -combustion engine, provide compressed air for the internal -combustion engine. The utility model discloses the switching of two -stage pressure boost and single -stage pressure boost can be realized, turbocharging system's structure size can be obviously reduced.