Pressure Symmetrical Bypass Device of Dual-channel Turbocharger

Abstract

The invention relates to a dual-channel turbocharger, in particular to a pressure symmetric bypass device for a dual-channel turbocharger, which belongs to the technical field of engine turbocharging. It includes a turbine casing, the upper part of the turbine casing is provided with a first turbine casing waste gas bypass passage and a second turbine casing waste gas bypass passage, and the lower part of the turbine casing is provided with a first turbine casing intake flow channel and a second turbine casing intake flow passage , the first turbine casing intake flow passage communicates with the first turbine casing waste gas bypass passage, and the second turbine casing intake flow passage communicates with the second turbine casing waste gas bypass passage. The first turbine casing air intake passage and the second turbine casing intake passage are arranged symmetrically. The two waste gas bypass passages of the present invention are symmetrically arranged, and the space is small, and the interference to the main air flow is small; when bypassing, the present invention can balance the pressure difference between the two intake air passages, thereby improving the overall combustion efficiency of the engine, and at the same time It can reduce the impact wear of the bypass air flow on the valve plate of the bypass valve.

Description

technical field [0001] The invention relates to a dual-channel turbocharger, in particular to a pressure symmetric bypass device for a dual-channel turbocharger, which belongs to the technical field of engine turbocharging. Background technique [0002] A turbocharger is actually an air compressor that compresses air to increase intake air. It uses the inertial momentum of the exhaust gas discharged from the engine to drive the turbine in the turbine housing, and the turbine drives the coaxial impeller, which presses the air sent by the air filter pipe to pressurize it into the cylinder. When the engine speed increases, the exhaust gas discharge speed and the turbine speed also increase synchronously, and the impeller compresses more air into the cylinder, and the pressure and density of the air increase to burn more fuel. Increase the fuel volume and adjust the engine speed accordingly. , the output power of the engine can be increased. When the engine is under high-speed...

AI Technical Summary

Problems solved by technology

For single-valve single-hole bypass, the wastegate valve is usually placed on the flow path close to the outlet. When the bypass valve is opened, the pre-vortex pressures of the two flow paths are inconsistent, resulting in the The pressure of the two groups of cylinders is inconsistent, that is, the inflation efficiency is inconsistent, the air volume distribution is uneven, and the oil sprayed by each cylinder is the same, resulting in uneven combustion, and the explosion pressure of each cylinder is also inconsistent, resulting in a reduction in the overall combustion efficiency of the engine

For single-valve double-hole bypass, the patent that recently disclosed this structure is US 2009 / 0028694. In the structure described in this patent, the bypass air outlet is placed on the side of the turbine casing, that is, the bypass air flow is in the same direction as the main air flow. The structure has the following disadvantages: First, the two bypass passages are asymmetrical (different in length and section), so after the bypass valve is opened, the pressure difference between the two intake passages still exists, which affects the overall combustion efficiency of the engine , at the same time, the impact and wear on the valve plate of the bypass valve is also relatively large; second, the structure of the intake runner and the bypass channel is complex, the cost is high, and the reliability is poor; third, when the valve plate is closed, the bypass The interference of the passageway space on the main airflow is relatively large

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