Turbocharger with two-stage supercharging function

Abstract

A turbocharger with a two-stage supercharging function relates to the technical field of turbocharger equipment of internal combustion engines of passenger motor vehicles and comprises a high-pressure turbocharger and a low-pressure turbocharger. An air channel which is communicated with a high-pressure turbine air inlet and a low-pressure turbine air inlet is arranged on a body of a high-pressure turbine shell, a flow control valve which is used for controlling airflow in the air channel is mounted on the air channel, a low-pressure turbine shell is integrally connected with the high-pressure turbine shell, and the low-pressure turbine air inlet is connected with a high-pressure turbine exhaust opening. The turbocharger with the two-stage supercharging function not only solves the conflict between high torque of a passenger motor vehicle an engine at a low rotation speed and maximization of power at a high rotation speed, but also is compact in structure, small in occupied space, fine in sealing performance, high in operational reliability and simple and convenient in production and installation, and has a high service value when used on passenger motor vehicles and the like with narrow engine spaces.

Description

technical field [0001] The invention relates to the technical field of supercharger equipment for internal combustion engines of passenger vehicles, in particular to a two-stage turbocharger. Background technique [0002] The turbocharger can increase the power, reduce the fuel consumption rate, reduce the size of the internal combustion engine, and restore the plateau power without changing the structure of the internal combustion engine. However, there are many defects when using a traditional single turbocharger to match the engine. : Cannot take into account the high-speed and low-speed working conditions of the engine, insufficient low-speed torque, poor economy at low speed and partial load, poor starting and acceleration performance, slow transient response and severe smoke, etc., which require a relatively wide range of speed and load For automotive engines, these defects are particularly prominent, and it is becoming more and more difficult to meet the needs of the ...

AI Technical Summary

Problems solved by technology

[0002] The turbocharger can increase the power, reduce the fuel consumption rate, reduce the size of the internal combustion engine, and restore the plateau power without changing the structure of the internal combustion engine. However, there are many defects when using a traditional single turbocharger to match the engine. : Can not take into account the high-speed and low-speed engine conditions, insufficient low-speed torque, poor economy at low speed and partial load, poor starting and acceleration performance, slow transient response and severe smoke, etc., which require a wide range of speed and load For automotive engines, these defects are particularly prominent, and it is becoming more and more difficult to meet the needs of the market

In order to meet the performance of the rated operating point and the low-speed high-torque point at the same time, and to meet the requirements of future emission regulations, the use of two-stage supercharger technology has received more and more attention, which is the main direction of turbocharger technology development. Currently used Most of the two-stage turbochargers use a small high-pressure supercharger and a large low-pressure supercharger in series. The two-stage turbocharger with this structure has a complex structure, many connecting pipelines, and takes up a lot of space. This makes the use of two-stage turbochargers limited in vehicles with narrow engine spaces such as passenger vehicles; in addition, there are many connecting pipelines, and there are many interfaces for each pipeline, which not only increases the work intensity of the installers, but also The interface of the pipeline is prone to air leakage due to poor connection, resulting in high energy consumption, which seriously affects the reliability of the two-stage turbocharger, thereby affecting the performance of the vehicle

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