Multi-valve bypass valve assembly for two stages of supercharging

Abstract

The invention relates to a turbocharger bypass valve assembly adopting a multi-valve structure, which is applied to two-stage supercharged engines. The bypass valve assembly comprises a rocker shaft which is rotatably mounted in a turbine casing through a bush, two or more bypass valve plates are fixed on the rocker shaft by bypass valve plate pins, the number of the bypass valve plates is equal to the number of exhaust ports of an engine, moreover, the shape of each bypass valve plate is matched with the shape of each exhaust port of the engine, a rocker is fixed on the end part of the rocker shaft outside the turbine casing, a rotary adjusting rod shaft is fixed on the rocker, and the drive shaft of a bypass valve actuator is connected with the rotary adjusting rod shaft. When the engine is in a high-speed, high-load working condition, the bypass valve plates of the bypass valve assembly are opened, redundant waste gas is directly expanded by a low-pressure stage supercharger and then is exhausted via double valves instead of a high-pressure stage turbine, and thereby the bypass valve assembly solves the problem that the conventional single-valve bypass valve cannot effectively exhaust the redundant waste gas.

Description

technical field [0001] The invention relates to the technical field of a turbocharger system of an internal combustion engine, and relates to a turbocharger bypass valve device with a multi-valve structure for a two-stage supercharged engine. Background technique [0002] The tandem two-stage turbocharger includes a high-pressure stage turbine and a low-pressure stage turbine. The exhaust gas outlet of the high-pressure stage turbine casing and the exhaust gas inlet of the low-pressure stage turbine casing are connected through a connecting pipe. The bypass valve is an adjustment device for high-pressure turbines. The bypass valve actuator (regulator) drives the bypass valve to control the opening and closing of the bleed valve. [0003] When the engine is running at a low speed, the exhaust gas from the engine enters the high-pressure stage turbine housing through the engine exhaust pipe, drives the high-pressure stage turbine to run and drives the impeller in the compresso...

AI Technical Summary

Problems solved by technology

[0007] When the engine is in a high-speed and heavy-load working condition, the bypass valve of the present invention is opened, and the excess exhaust gas passes through the double valves instead of the high-pressure turbine, and is directly discharged after being expanded by the low-pressure turbocharger, which solves the problem of the existing single-valve bypass Problems with the valve not being able to effectively discharge excess exhaust gas

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