Three-way catalyst for automobile exhaust

Abstract

The invention relates to the technical field of automobile exhaust purification equipment, and discloses a three-way catalyst for automobile exhaust, which comprises an interlayer jacket, and a heat insulation interlayer is fixedly mounted on the inner surface of the interlayer jacket. The diameter of the variable-speed tube is large on the left and small on the right, the variable-speed tube and the gas guide tube are installed through the fixing block at an interval, tail gas flows into the gas guide tube from the variable-speed tube, the flow speed is increased and then decreased, and negative pressure is generated at the interval of the gas guide tube and the variable-speed tube; tail gas diffused and exhausted through the diffusion pipe collides with the inclined face of the partition pipe and then flows back from the outer ceramic carrier to be further heated and purified, the tail gas is sucked into the gas guide pipe again through negative pressure at the interval between the gas guide pipe and the speed change pipe, follow-up entering tail gas is heated and then purified through the inner ceramic carrier, and the purification effect is better for the situation that the content of CO and the like in the tail gas is high at the beginning of starting; and the temperature of the tail gas rises quickly, the speed of the inner ceramic carrier reaching the normal working temperature is higher, and the amount of discharged polluted tail gas is smaller.

Description

technical field [0001] The invention relates to the technical field of automobile exhaust purification equipment, in particular to a three-way catalytic converter for automobile exhaust. Background technique [0002] The three-way catalytic converter is the most important external purification device installed in the exhaust system of automobiles. It can convert harmful gases such as CO, HC and NOX emitted from automobile exhaust into harmless carbon dioxide, water and NOX through oxidation and reduction. Nitrogen, when the high-temperature automobile exhaust passes through the purification device, the purification agent of the three-way catalytic converter will enhance the activity of the three gases of CO, HC and NOX, and promote a certain redox reaction, and the three harmful gases will be transformed into harmless gases , so that the car exhaust can be purified. [0003] During the use of the existing three-way catalytic converter, the exhaust gas from the engine passes...

AI Technical Summary

Problems solved by technology

[0004] The initial operating temperature of the three-way catalytic converter is 250 degrees, and the normal operating temperature is 400-800 degrees. When the engine is idling or before reaching the normal operating temperature, the temperature of the exhaust gas discharged from the engine into the three-way catalytic converter is not enough, and the exhaust gas inside The content of CO, HC and NOX is high, resulting in poor purification effect of the exhaust gas discharged through the three-way catalytic converter

Images