Coating function of automobile exhaust gas purifier
The entire automobile exhaust gas purifier is mainly composed of four parts: carrier, coating, damping pad and shell. The carrier is a porous, heat-resistant solid substance that carries the active component. Currently, a honeycomb monolithic ceramic carrier is generally used, and this carrier is extruded from cordierite. Its advantages are that it has good thermal stability, strong resistance to cold and heat shocks, and a small thermal expansion coefficient. The shape of the carrier generally includes a circle, an ellipse, a racetrack shape, and irregular shapes similar to a circle.
coating is to disperse the catalytic material on the carrier, including rare earth and precious metals platinum, palladium, rhodium, ruthenium and other substances. The damping pad is located between the shell and the carrier, and its function is to prevent vibration, reduce stress, and protect the carrier. It is designed based on pressure.
The purifier shell is the main part of the structural design, and its material and shape are important factors that affect the conversion efficiency and service life of the purifier. Since the purifier is installed under the chassis of the car and connected to the exhaust pipe of the engine, the exhaust contains water vapor and is susceptible to corrosion. In order to avoid corrosion, the current shell material is mostly stainless steel containing Ni, Cr or cold-rolled plate with aluminum immersed on the surface. The shape design of the housing requires that the vortex and separation of the air flow through the purifier be reduced as much as possible to prevent the increase of air flow resistance. Special attention should be paid to the shape design of the intake front cone to ensure the uniformity of the intake flow to improve the conversion efficiency and service life. In order to enhance the strength of the shell and prevent deformation, it should be considered to provide concavo-convex reinforcing ribs on the shell. For automotive parts and parts machining, PTJ Shop offers the highest degree of OEM service with a basis of 10+ years experience serving the automotive industry. Our automotive precision shop and experts deliver confidence. We have perfected the art of producing large component volumes with complete JIT reliability, backed by the quality and long-term reliability our customers expect.
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