Concentric combined dual-rotor exhaust turbocharging system structure

Abstract

The invention provides a concentric combined dual-rotor exhaust turbocharging system structure. According to the structure, two gas compressor impellers and two turbine rotors are integrated through a concentric shaft structure, an outer shaft and an inner shaft are connected with turbines and the gas compressor impellers, two superchargers are coaxial but different in speed and are combined to move, the two gas compressor impellers and the two turbines can achieve series or parallel air intake through an adjusting system, and the purposes of improving the pressure ratio, widening the working range and improving the structural compactness are achieved.

Description

technical field [0001] The invention belongs to the technical field of turbocharging, and in particular relates to a concentrically combined double-rotor exhaust gas turbocharging system structure. Background technique [0002] The exhaust gas turbocharger is driven by the energy of exhaust gas exhausted by the engine to compress fresh air into the cylinder. Under the same engine displacement condition, the intake air volume of the engine is increased to match the engine to inject more fuel, so that it can be fully burned to achieve The purpose of increasing power is widely used in piston internal combustion engines such as gasoline engines and diesel engines. [0003] With the strengthening of engine power density and stricter emission regulations, single-stage supercharging can no longer meet the working requirements of the engine in all regions. Conventional single-stage supercharging has a low pressure ratio, and the increase of its pressure ratio will result in a narrow...

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Problems solved by technology

[0003] With the strengthening of engine power density and stricter emission regulations, single-stage supercharging can no longer meet the working requirements of the engine in all regions. Conventional single-stage supercharging has a low pressure ratio, and the increase of its pressure ratio will result in a narrow flow range. , The problem of reduced reliability margin;

[0004] Therefore, a two-stage (or multi-stage) adjustable supercharging system has appeared, which realizes the series and parallel combination of multiple superchargers through adjustment to achieve the purpose of high pressure ratio and wide flow range. However, due to the use of multiple superchargers At the same time, it also brings prominent problems such as increased weight, large volume, low overall system efficiency, narrow single-vortex double-pressure flow range, and complicated pipeline layout.

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