Exhaust manifold for close-coupled catalytic converters

Abstract

An exhaust manifold of a tight coupling catalyst is used for being connected with a four-cylinder internal combustion engine. The exhaust manifold of the tight coupling catalyst comprises a branch part, a five-way assembly and the tight coupling catalyst, wherein the branch part, the five-way assembly and the tight coupling catalyst are connected in sequence. The five-way assembly is connected with an oxygen sensor base. The tight coupling catalyst is provided with an adjustable support assembly. The oxygen sensor base is provided with an oxygen sensor. The branch part is provided with four branches. The branches are connected and communicated with air cylinder exhaust airflow channels of the engine. After airflow in the branches is gathered to the five-way assembly, the airflow is further gathered in the five-way assembly and impacts the oxygen sensor, and the catalytic reaction is carried out on well guided and carded high-temperature gas evenly through the tight coupling catalyst. By additionally arranging the five-way assembly, the bend type structure with the simple technology can be applied in long and narrow space so as to reduce the cost, meanwhile, it is ensured that the oxygen sensor is excellent in data collection capacity, the efficiency of the tight coupling catalyst is the maximum, and by means of the adjustable support assembly, the exhaust manifold is easy to install.

Description

technical field [0001] The invention relates to an engine exhaust device, in particular to an exhaust manifold closely coupled to a catalytic converter. Background technique [0002] The close-coupled exhaust manifold directly couples the catalytic converter to the exhaust manifold, so that the exhaust gas loses less heat before entering the catalytic converter, which greatly improves the purification efficiency of the exhaust gas when the exhaust temperature is low under the starting and stopping conditions of the car. However, because the catalytic converter of this type of manifold is too advanced, and the accessories of the engine are becoming more and more complicated, the space left for the exhaust manifold itself, especially the arrangement of the branch pipes on the exhaust manifold, is severely compressed. [0003] The traditional bent pipe exhaust manifold has a simple process, but has the following disadvantages: [0004] 1. It is necessary to ensure a certain ra...

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Problems solved by technology

[0004] 1. It is necessary to ensure a certain radius of the elbow, and the demand for space is large, so the traditional elbow structure cannot be arranged:

[0005] 2. The four curved pipes are directly inserted into the end cone, and the exhaust gas from the two pipes far away from the oxygen sensor is difficult to fully impact the oxygen sensor, causing the oxygen sensor to fail to collect data effectively

Therefore, the process cost, material cost and failure cost of this exhaust manifold are difficult to guarantee

[0009] In addition, for the stainless steel exhaust manifold, due to the manufacturing precision and the existence of welding deformation, it is difficult to install the fixing bracket and there is a large assembly stress after assembly is also a problem that is difficult to solve

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