Exhaust system structure capable of improving reliability

Abstract

The invention discloses an exhaust system structure capable of improving reliability, and belongs to the field of diesel engine exhaust systems. The exhaust system structure comprises a metal wave-shaped exhaust pipe gasket arranged between an exhaust pipe and a cylinder cover of a diesel engine, a plurality of exhaust pipe bolts fixedly connected with the exhaust pipe and the cylinder cover, first anti-loosening pads arranged on the exhaust pipe bolts, a first elbow flange arranged between the exhaust pipe and an exhaust elbow, a plurality of bolts with holes for fixedly connecting the exhaust pipe and the exhaust elbow, a second anti-loosening pad arranged between a first elbow flange and the bolts with holes, and a second elbow flange arranged between the exhaust elbow and a pulse converter, wherein the exhaust elbow is fixedly connected with the pulse converter through a plurality of second bolts with holes, and meanwhile third anti-loosening pads are arranged between the second bolts with holes and the second elbow flange. The problems that bolts of a diesel engine exhaust system are loosened, and smoke leaks from a junction surface are solved, and the use requirement is met; and the structure is simple, and installation and maintenance are simple and easy.

Description

technical field [0001] The invention relates to the technical field of exhaust systems of diesel engines, in particular to an exhaust system structure with improved reliability, which is used in the exhaust systems of water-cooled series diesel engines. Background technique [0002] With the continuous improvement of the power of diesel engines, the mechanical and thermal loads on diesel engines continue to increase, and the requirements for the sealing performance of diesel engine exhaust systems are also getting higher and higher. Through summarizing the failures of water-cooled diesel engines in recent years, it was found that the joint surface of the exhaust pipe and the cylinder head in the exhaust system leaked smoke, the liner was broken, the smoke leaked from the joint between the exhaust pipe and the exhaust elbow, and the conversion between the exhaust elbow and the pulse The frequent occurrence of smoke leakage faults at the connection of the diesel engine serious...

AI Technical Summary

Problems solved by technology

[0004] Through analysis, the temperature resistance of the exhaust pipe bolt material at the joint between the exhaust pipe and the cylinder head is insufficient, which cannot meet the exhaust temperature requirements after the power is increased, resulting in deformation of the bolts, which in turn leads to loosening and smoke leakage from the joint surface; the same is true for insufficient bolt torque. The bolts are loosened, smoke leaks from the joint surface, the high-temperature flue gas ablates the non-metallic gasket, and the smoke leakage fault is aggravated

The thickness of the flanges at both ends of the exhaust elbow is relatively thin, and it is easy to deform in a high temperature environment. The bolts at both ends of the elbow lack anti-loosening measures, and the installation stress during installation will easily cause the bolts to loosen and smoke leakage from the joint surface;

[0005] In view of the above technical shortcomings, it is necessary to design an exhaust system structure that solves the problems of bolt loosening and joint surface smoke leakage in the exhaust system of water-cooled series diesel engines

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