Diesel engine sequential turbocharging structure with anti-surge function

Abstract

The invention aims at providing a diesel engine sequential turbocharging structure with an anti-surge function. The diesel engine sequential turbocharging structure comprises a diesel engine body, a turbosuperchager, an intercooler, a release valve, an air valve and a fuel valve, wherein the turbosuperchager comprises a basic supercharger and a controlled supercharger, worm wheels of the basic supercharger and the controlled supercharger are respectively connected with an A line of exhaust manifolds and a B line of exhaust manifolds of the diesel engine body, compressors of the basic supercharger and the controlled supercharger are connected with the intercooler, the intercooler is connected with a gas inlet manifold of the diesel engine body, the A line of exhaust manifolds is communicated with the B line of exhaust manifolds through an exhaust communicating pipe, the release valve is arranged between the compressor of the basic supercharger and the intercooler, the air valve is arranged between the compressor of the controlled supercharger and the intercooler, and the fuel valve is arranged between a worm wheel of the controlled supercharger and the B line of exhaust manifolds. According to the invention, the surge of the basic supercharger can be eliminated, and the use environment of the basic supercharger is effectively improved.

Description

technical field [0001] The present invention relates to an engine, in particular a sequentially supercharged engine. Background technique [0002] Sequential supercharging technology is the first technology adopted by German MTU company. Its design is mainly to expand the working range of low compression ratio and high supercharging engine, increase the low-speed torque of the engine and reduce the fuel consumption rate during partial load operation. Its basic principle is to use multiple turbochargers, which are sequentially put into operation as the engine speed and load increase, so as to ensure that the working turbochargers are always running in the high-efficiency zone, so that the engine's The fuel consumption rate is low throughout the operating range, and the low-speed high-torque performance is good. [0003] At present, the existing diesel engine sequential supercharging structure does not have a discharge valve at the outlet of the basic supercharger compressor....

AI Technical Summary

Problems solved by technology

[0003] At present, the existing diesel engine sequential supercharging structure does not have a discharge valve at the outlet of the basic supercharger compressor. During use, the controlled supercharger speed is constantly increasing during the cut-in process. , and exceeds the basic supercharger, at this time, the outlet pressure of the controlled supercharger compressor is higher than the basic supercharger compressor outlet pressure, the controlled compressor outlet pressure is higher than the pressure in the stabilizing chamber, and the controlled compressor’s The flow rate is larger than that of the basic compressor, which causes the operating point of the basic supercharger compressor to move to the direction of small flow. The supercharger is prone to surge phenomenon, which has certain damage to the basic supercharger

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