Diesel engine silencer of tension-free silencing chamber structure

Abstract

The invention relates to a diesel engine silencer of a tension-free silencing chamber structure. The diesel engine silencer comprises a gas intake pipe, a tension-free silencing shell, a silencing partition plate, a primary noise reducing pipe, a terminal noise reducing pipe and a scalding-proof shield. The tension-free silencing shell comprises a sectional material pipe body, a left end cover and a right end cover. The left end cover and the right end cover are fixed at the two ends of the sectional material pipe in a sealed mode respectively. The silencing partition plate is arranged in the tension-free silencing shell. A silencing hole is formed in the silencing partition plate. The tension-free silencing shell is divided by the silencing partition plate into a primary noise reducing cavity and a silencing cavity of a terminal noise reducing cavity. The primary noise reducing cavity is communicated with the primary noise reducing pipe. The terminal noise reducing cavity is communicated with the terminal noise reducing pipe. The outlet of the terminal noise reducing pipe is communicated with the air. The gas intake pipe is communicated with the primary noise reducing cavity through the primary noise reducing pipe. The scalding-proof shield is fixed to the outer end of the tension-free silencing shell. The diesel engine silencer of the tension-free silencing chamber structure is simple in structure, good in manufacturing technology, low in production cost, good in anti-vibration anti-fracture performance and reliable in use and the noise reducing performance of the diesel engine silencer is equal to that of an existing product.

Description

Technical field: [0001] The invention relates to the technical field of diesel engines, in particular to a muffler in an exhaust system of a diesel engine. Background technique: [0002] With the improvement of modern living standards, people's awareness of environmental protection is increasing, and the requirements for diesel engine emission performance are also increasing. The applicants disclosed a double-chamber muffler for a single-cylinder diesel engine in Chinese patents ZL201220733146.3 and ZL201220733523.3. The former is a vertical structure, and the latter is a horizontal structure. The mufflers of these two structures are developed for single-cylinder vertical air-cooled diesel engines. The noise pipe, the terminal noise reduction pipe and the anti-scalding shield, the upper shell and the lower shell form a hollow body, and a partition with holes is arranged in the hollow body to separate the hollow body into the first expansion chamber and the second expansion c...

AI Technical Summary

Problems solved by technology

The muffler with this structure has ideal cooling and noise reduction effects, but the production process is very demanding, the production cycle is long, the efficiency is low, and the cost remains high. Among them, the most prominent is the welding of the upper shell and the lower shell. For the muffler chamber of the company, since the upper shell and the lower shell are sheet metal stretched parts with a large depth, the stretching requirements are very high. Both the upper shell and the lower shell must be stretched twice before they can be formed. Two sets of stretching dies are needed, and each part needs to go through blanking, primary stretching, forming secondary stretching, forming and trimming processes, and then the upper shell and the lower shell are surrounded by butt welding to form a muffler chamber body, this kind of structure requires high manufacturing process and many production molds. Each muffler cavity needs to go through secondary blanking, four times of stretching, and secondary trimming, and the butt edges must be sealed and welded throughout the process. Not only the utilization rate of the steel plate is low , the production cycle is long, the production efficiency is low, and the production cost of the product is high, which is difficult for users to accept

Due to the butt joint structure between the upper shell and the lower shell, if there is a false weld between the two, the diesel engine is used under high-frequency vibration working conditions, and vibration cracks are likely to occur between the upper shell and the lower shell

Such a muffler not only has high production cost, but also has poor anti-vibration performance, short service life, and does not meet the current requirements for energy saving and consumption reduction. Therefore, the applicant has optimized and improved the existing technology and designed a non-stretching anechoic chamber structure. Diesel muffler, used to solve the above problems

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