Waste gas bypass turbine motor with guide vanes

Abstract

The invention discloses a waste gas bypass turbine motor with guide vanes. The waste gas bypass turbine motor comprises a turbine shell, a power turbine and a gas inlet flow channel are mounted in the turbine shell, and a non-blade nozzle for guiding gas guided in by the power turbine into the gas inlet flow channel is arranged at the position, close to the tail of the power turbine, of the turbine shell. A guide vane assembly capable of adjusting the flow capacity of the turbine shell by changing the number, size, angle and layout of the guide vanes is mounted at the position, close to the non-blade nozzle, in the turbine shell. In this way, only one kind of turbine shells can be adopted in one series of superchargers, the flow capacity of the turbine shell is adjusted through the number, size, angle and layout of the guide vanes, and therefore mold cost is greatly reduced, the flow capacity can be finely adjusted, and matching performance achieves the best. The precisely-cast guide vanes are good in production consistency, and the requirement for consistency of the pressure ratio and flow of the superchargers can be met more easily after emissions are upgraded to the national standard IV and the national standard V.

Description

technical field [0001] The invention relates to a turbine used for a turbocharger, in particular to a waste gas bypass turbine with guide vanes, which belongs to the field of internal combustion engines. Background technique [0002] The speed range of the vehicle engine is wide, and the turbocharger is limited by the characteristics of the engine and the supercharger, so it is difficult to obtain the best match at both high and low speed ends. If it is matched according to the medium and high speed end, the boost pressure at the low speed end is insufficient. In order not to deteriorate the smoke emission performance, the fuel supply has to be limited (through the smoke limiter), thus sacrificing the low speed torque and affecting the low speed drivability of the vehicle . The wastegate turbocharger is a product developed to solve the low-speed power shortage of the diesel engine. It is best matched at the low-speed end, the low-speed boost pressure is high, and the smoke ...

AI Technical Summary

Problems solved by technology

[0007] In order to match engines with different displacements and powers, a series of turbochargers must match multiple turbines with different A / Rs, especially for dual-channel pulse turbines, and different A / Rs must be set in different channels , not only in the performance test matching, subject to the cost of the mold, it is impossible to process too many turbine shells for fine matching, and the optimal performance cannot be achieved, but also, in the later batch production, there will be a series of different A / R Turbine shells with many molds not only lead to increased costs, but also increase the difficulty of management

[0008] Coupled with the upgrade of the current emission technology and the gradual transition to National IV and National V emissions, the requirements for the flow rate and pressure ratio of the turbocharger are more stringent. The traditional waste gas bypass structure turbine casing is all sand casting, so it is difficult to ensure consistent production sex

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