Turbocharger with variable turbine cross section and variable flow control function

Abstract

The invention discloses a turbocharger with a variable turbine cross section and a variable flow control function, which is suitable for improving low working condition performance and transient characteristics and can meet the requirement on full-speed working condition characteristics of a supercharging internal combustion engine for vehicles / ships / engineering machinery. The turbocharger mainly comprises the ordinary conventional structure turbocharger with a double-flow channel inlet turbine volute, a switch / drain valve and a corresponding connecting pipeline. Due to linked conversion and switching of the opening and closing actions of the valve in a valve box, the configuration relationship between the flow rate of exhaust fuel gas flowing into the turbine and a through-flow cross section can be changed. Control can be performed accordingly, so that supercharging pressure can be increased greatly under a low (rotating speed / load) working condition and the increase of the supercharging pressure is suppressed under a high (rotating speed / load) working condition. Compared with the prior art, the turbocharger has the advantages of complete function, high control degree, mature technology, simple structure, low cost, easy combination with the current technology, large development potential and high popularization and application value.

Description

technical field [0001] The invention relates to a turbocharger in the technical field of internal combustion engine supercharging for vehicles, ships and engineering machinery. Background technique [0002] Internal combustion engine exhaust gas turbocharging is to introduce the exhaust gas discharged from the internal combustion engine into the turbine of the turbocharger, use the energy contained in the exhaust gas to drive the turbine impeller to rotate, and drive the compressor impeller installed coaxially with it in the turbocharger to rotate, so that the exhaust gas entering the internal combustion engine The air participating in the combustion is pressurized in the compressor, which increases the intake air density (increases the amount of air charged per working cycle of the internal combustion engine) and then flows into the cylinder of the internal combustion engine, allowing a larger amount of fuel to be added to the cylinder for complete combustion. The result As...

AI Technical Summary

Problems solved by technology

However, the two technical solutions still have potential for continuous improvement in terms of overcoming the single function, greatly improving the regulation, and simplifying the structure to reduce manufacturing costs.

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