Two-staged sequential turbocharging anti-surge structure of diesel engine

The invention aims at providing a two-staged sequential turbocharging anti-surge structure of a diesel engine. The two-staged sequential turbocharging anti-surge structure comprises the diesel engine, an inlet manifold, an exhaust manifold, a high-pressure-stage basic supercharger, a lower-pressure-stage basic supercharger, a high-pressure-stage controlled supercharger and a low-pressure-stage controlled supercharger, wherein the inlet manifold and the exhaust manifold are respectively communicated with the inlet end and the exhaust end of the diesel engine. A gas valve is installed between an exhaust gas communicating tube and a controlled supercharger high-pressure-stage turbine inlet, a high-pressure-stage air valve is installed between a high-pressure-stage intercooler inlet and a controlled supercharger high-pressure-stage gas compressor outlet, a low-pressure-stage air valve is installed between a lower-pressure-stage intercooler inlet and a controlled supercharger low-pressure-stage gas compressor outlet, and an air bypass valve is installed between a low-pressure-stage intercooler outlet and a controlled supercharger low-pressure-stage gas compressor inlet and is connected with the low-pressure-stage air valve in parallel. The two-staged sequential turbocharging anti-surge structure can effectively prevent low-pressure-stage surge of the controlled superchargers, large pressure fluctuation of high-pressure-stage outlets and the like and further improves the transient switching performance of the diesel engine.