Adjustable high boost system with structure of series-parallel connection of turbochargers in different size

Abstract

This invention relates to a turbocharger multiple-series adjustable boost system, which belongs to combustion engine technique field. The system comprises diesel engine air inlet pipe, diesel engine, diesel engine discharge pipe, high-pressure turbine stage by-pass conduit and by-pass valve, high-pressure turbine stage by-pass conduit, high-pressure turbine stage, high and low pressure turbine connecting pipe flow change-over valve, high and low pressure turbine connecting pipe, low-pressure turbine stage by-pass conduit, low-pressure turbine, intercooler, high booster by-pass conduit and by-pass valve, high booster by-pass conduit, high blower, high and low pressure booster connecting pipe flow change-over valve, high and low pressure booster connecting pipe, low pressure booster by-pass conduit and low pressure booster, wherein the diesel engine is connected with diesel engine air inlet pipe and diesel engine discharge pipe separately, and the high pressure turbine outlet is connected with the low pressure turbine through the high and low pressure turbine conduit. By said invention, it can realize single-stage turbocharging, successive turbocharging and two-stage turbocharging.

Description

technical field [0001] The invention relates to a supercharging system in the technical field of internal combustion engines, in particular to a series-parallel adjustable supercharging system of large and small turbochargers. Background technique [0002] In order to increase power density, most modern engines use higher boost pressure, which leads to a series of problems that need to be solved, such as acceleration problems, performance problems at low working conditions, and soot emission problems. For high-charged diesel engines, even if they operate according to the cubic operating characteristics, sometimes the performance at low operating conditions cannot meet the requirements, and appropriate measures must be taken to improve the performance at low operating conditions. The past high working condition bleed air, intake and exhaust bypass, variable cross-section turbine, Miller system, etc. can no longer meet the performance requirements of low working condition at h...

AI Technical Summary

Problems solved by technology

However, the variation range of the equivalent flow area of ​​the turbine under different working conditions is not large enough, and the adaptability to the working conditions of high-pressure diesel engines is still limited.

Images