Double-supercharged diesel engine gas circuit

Abstract

The invention discloses a double-supercharged diesel engine gas circuit which mainly comprises a low-pressure stage supercharger, a high-pressure stage supercharger and an intercooler, wherein the low-pressure stage supercharger is arranged at the back end of a diesel engine, and the high-pressure stage supercharger is arranged in a flange of an exhaust pipe of the diesel engine; turbine volute casings and central connecting lines of air compressor volute casings of the low-pressure stage supercharger and the high-pressure stage supercharger are vertical; the air compressor volute casing of the low-pressure stage supercharger is connected with the air compressor volute casing of the high-pressure stage supercharger by an arc-shaped connecting pipe; the turbine volute casing of the low-pressure stage supercharger is connected with the turbine volute casing of the high-pressure stage supercharger by a straight-pipe corrugated pipe and the like, and the intercooler is connected with theair compressor volute casing of the high-pressure stage supercharger and is communicated with an engine combustor by an air inlet pipe. The central lines of the low-pressure stage supercharger and the high-pressure stage supercharger in the gas circuit are vertical and are connected in series so as to solve the problem that the low-pressure stage supercharger and the high-pressure stage supercharger are limited by space in an arrangement process of the diesel engine gas circuit and avoid the problem of energy loss caused by direction change in an exhaust gas transmission process, thereby realizing the maximization utilization of exhaust gas energy and achieving the purpose of increasing the utilization ratio of the exhaust gas energy.

Description

Technical field [0001] The invention relates to the technical field of automobiles, and more specifically to a dual-supercharged diesel engine gas circuit. Background technique [0002] In a diesel engine, about 30% to 37% of the heat emitted by the fuel is taken away by the exhaust gas. The high-temperature exhaust gas is discharged into the atmosphere, which not only loses heat energy, but also pollutes the environment. In order to increase the power of diesel engines on automobiles or ships, supercharging is generally used to achieve the above-mentioned purposes. The so-called supercharging refers to increasing the cylinder's charge by increasing the intake pressure of the diesel engine, so that the amount of fuel injected into the cylinder can be increased accordingly, and the average effective pressure of the diesel engine can be increased, thereby effectively increasing the power of the diesel engine. Under normal circumstances, a turbocharger with supercharging function i...

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Problems solved by technology

[0005] In view of this, the present invention provides a dual-supercharged diesel engine gas path to overcome the space limitation of the arrangement of the exhaust gas turbocharger in the prior art and the reduction of the supercharging effect of the pressure-stage supercharger caused by the redirection of the exhaust gas. question

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