DPF cylinder assembly sealing structure

Abstract

The invention provides a DPF cylinder assembly sealing structure. The structure comprises a front cylinder, a DPF cylinder, a sealing ring and a V-shaped hoop, the side, close to the DPF cylinder, ofthe front cylinder is axially positioned and radially matched, the side, close to the DPF cylinder, of the front cylinder is in the shape of an arc with straight edges, the sealing ring is arranged between the front cylinder and the DPF cylinder in a clamped mode, and the upper part of the joint between the front cylinder and the DPF cylinder is sealed through the V-shaped hoop in a matched mode.According to the structure, excessive air leakage points are reduced, the problem of air leakage is solved, costs are saved, and the resistance of a DPF cylinder assembly to radial vibration is increased.

Description

technical field [0001] The invention mainly relates to the field of tail gas post-treatment structure design, and in particular to a sealing structure of a DPF cylinder assembly. Background technique [0002] Diesel engines often use catalytic mufflers to reduce harmful substances in the engine exhaust. With the limitation of particulate matter in diesel vehicle exhaust emissions, the large-scale application of diesel particulate filter DPF is applied to catalytic muffler. DPF captures particles through surface and internal filter devices. DPF can effectively purify 70% - 90% of the particles in the exhaust gas. It is the most effective and direct way to purify diesel engine particulate matter. However, with the increase of particulate matter in the DPF, the exhaust back pressure is too large. At this time, the vehicle will start the regeneration process, and use high temperature to burn the carbon particles and hydrocarbons collected by the DPF. Since there is non-combust...

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Problems solved by technology

[0004] 1. The amount of air leakage at the locking part of the V-shaped clamp is slightly larger, because the temperature of DPF regeneration will be above 600°C, after a long period of accumulation, the high temperature will damage the surrounding components;

[0005] 2. The thickness of the V-shaped sealing ring is relatively large, and its material is iron-based graphite. The conventional raw material for this material is 2mm thick, while the iron-based graphite used for flanging here is 14mm thick, and its material is very soft, and its machinability is excellent. Poor, so V-rings are expensive;

In this way, when the vehicle is running, the strength of the DPF assembly against radial vibration is very low

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