Outlet flowing intersecting surface changing adjustable turbo nozzle ring

Abstract

The invention relates to a turbine nozzle ring used in turbochargers. Compressed air from an outlet of an air compressor of the turbocharger and / or an external source goes through a hollow internal cavity of the nozzle vanes or a hollow sandwich near the internal wall of an intake pipe of a vane-less spiral case and blows directly to the nozzle vane ring or main burning gas flow at a flow passage and / or an outlet of the vane-less spiral case through a ventilation groove gap cut between a vane-shaped back side (or front side) and / or a rear margin part or through circular arc-shaped ventilation gap of the outlet of the hollow sandwich near the zero-degree section of the tip of the vane-less spiral case, making the mixed air of blowing flow from the gaps and the main flow change the flow direction at the outlet of the nozzle ring and causing the change of the flow angle (namely flow section) at the outlet. The invention has the advantages of wide range of control simple structure, low cost, safety and reliability, high efficiency, straightforward control and being applicable for turbochargers and being capable of making use of external air, additional pressure and external energy to supply auxiliary power.

Description

technical field [0001] The invention relates to the variable section adjustment technology of a turbine nozzle ring in a turbocharger in the technical field of internal combustion engine turbocharging. Background technique [0002] The use of variable nozzle ring turbine adjustment technology for turbochargers is an effective measure developed in the past two decades to improve internal combustion engine torque reserve and transient response, and reduce fuel consumption and harmful emissions. By changing the flow cross-sectional area of ​​the outlet of the turbine nozzle ring, a good match between the supercharger and the internal combustion engine can be achieved in the full range of operating conditions. , [0003] According to the structure of the turbine nozzle ring, variable nozzle ring adjustment can be divided into nozzle blade ring (turbine nozzle ring cascade composed of nozzle blades, also known as bladed nozzle ring) adjustment and bladeless nozzle ring (bladeles...

AI Technical Summary

Problems solved by technology

The disadvantages are: complex structure, high manufacturing precision, high price, and large volume; long-term work in the environment of high temperature and soot, it is difficult to ensure the reliability of the structure and operating system, and the rotating blades will become stuck, seized and fail

For this reason, it is only applied on the turbocharger of a diesel engine with a relatively low gas temperature, and has not yet been popularized and applied to a turbocharger for a gasoline engine with a higher gas temperature; The high-temperature gas leakage caused by the gap left by the rotating blades will reduce the efficiency of the turbine stage; the adjustment of the angle of the nozzle blade will cause the change of the angle of attack of the impeller inlet airflow and the degree of reaction of the turbine stage. If the adjustment range is too large, the efficiency of the turbine stage will be greatly reduced. decline

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