Double-channel turbocharger

Abstract

The invention discloses a double-channel turbocharger. The double-channel turbocharger comprises a turbine motor, wherein a worm impeller, a volute high-pressure gas inlet channel and a volute low-pressure gas inlet channel are arranged in the turbine motor; a high-pressure gas exhaust manifold and a low-pressure exhaust manifold are arranged on an engine; the volute high-pressure gas inlet channel is connected with the high-pressure gas exhaust manifold; the volute low-pressure gas inlet channel is connected with the low-pressure gas exhaust manifold; a connecting channel and a regulating valve are arranged between the high-pressure gas exhaust manifold and the low-pressure gas exhaust manifold; and number of connecting air cylinders of the high-pressure gas exhaust manifold is greater than that of the low-pressure gas exhaust manifold. In a low-speed area, the regulating valve is closed or has certain aperture, so that gas exhaust back pressure of the volute high-pressure gas inlet channel is higher than gas inlet pressure after turbo-charge; meanwhile, more exhausted gas flows into a turbine from the volute high-pressure gas inlet channel, so that medium-low-rotation-speed turbo-charge needs of the engine are met. In a large-load medium-high-speed area, the regulating valve is opened for discharging exhausted gas of the high-pressure gas exhaust manifold into the low-pressure gas exhaust manifold under a condition that enough gas exhaust back pressure is guaranteed, so that gas exhaust back pressure of the high-pressure channel is reduced, pumping gas loss is reduced and engine efficiency s improved.

Description

technical field [0001] The invention belongs to the field of internal combustion engines, and in particular relates to a double-channel vortex supercharger. Background technique [0002] As emission regulations become more and more stringent, it is necessary to control the formation of nitrogen oxides. To suppress the formation of nitrogen oxides generally requires controlling the combustion temperature and the concentration of oxygen. To achieve this goal, people have proposed exhaust gas recirculation technology (EGR). Exhaust gas recirculation technology is to reintroduce part of the exhaust gas of the engine directly (or after cooling) into the cylinder. Due to the high specific heat capacity of polyatomic molecules such as carbon dioxide in the exhaust gas, it can effectively reduce the combustion temperature. In addition, the introduced exhaust gas can effectively reduce the gas entering the cylinder. Oxygen concentration in the air, so as to achieve the purpose of sup...

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Problems solved by technology

[0003] The purpose of the present invention is to address the limitations of variable cross-section turbochargers with high cost, complex control, and poor reliability. The asymmetric split turbine type dual-channel turbocharger has large pumping losses in the high-speed region of the engine, and the engine efficiency becomes low. Low, can not be matched with the engine of the same displacement, does not have the problem of universality, provides a kind of exhaust back pressure that can effectively provide EGR, and the exhaust back pressure is lower, the pumping loss is smaller, the engine A dual-channel supercharger with higher efficiency, adjustable supercharging characteristics at low and medium speeds, low cost and simple structure

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