Silencer for single cylinder diesel capable of reducing noise and emission and manufacturing method of silencer

Abstract

The invention discloses a silencer for a single cylinder diesel capable of reducing noise and emission and a manufacturing method of the silencer. The silencer comprises a pipe connector, an upper shell, a lower shell, an upper silencing net, a lower silencing net, a filtering body, vibration isolation pads, an exhaust pipe and a sound absorbing material layer. One end of the pipe connector is connected to an exhaust elbow pipe of a cylinder cover of an engine through threads, and the other end of the pipe connector is fixedly connected with the lower shell. A groove is formed between the lower shell and the upper shell. The exhaust pipe is in necking connection with a pipe orifice of the upper shell. The upper silencing net is arranged at the upper end of the filtering body. The lower silencing net is arranged at the lower end of the filtering body. The two ends of the filtering body are provided with the vibration isolation pads extending outwards correspondingly. The filtering body, the upper silencing net and the lower silencing net are arranged in the groove between the upper shell and the lower shell. The inner wall of the upper shell, the inner wall of the lower shell and the inner wall of the exhaust pipe are filled with the sound absorbing material layer. The method that a ventilation net section three-stage step-by-step magnified silencing mode is adopted, and airflow is subjected to big and small hole alternate silencing and sound absorbing material combined silencing is adopted, and thus noise can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of mufflers, in particular to a noise-reducing and emission-reducing single-cylinder diesel engine muffler and a preparation method thereof. Background technique [0002] The muffler is a device that prevents sound transmission and allows airflow to pass through, and is an important measure to eliminate aerodynamic noise. A device installed at the engine exhaust port to reduce noise. [0003] The existing single-cylinder diesel muffler is composed of an inlet pipe joint, a first-stage enlarged muffler chamber, and an exhaust pipe, and its disadvantages are as follows: [0004] 1. The diesel engine works rough in the process of combustion and work, and the muffler effect of the first-stage amplification of the diesel engine is poor. The noise and the high decibel level were unbearable, so the traffic control department stipulated that agricultural transport vehicles, tractors, and walking tractors equipped ...

AI Technical Summary

Problems solved by technology

[0004] 1. The combustion and work process of the diesel engine is rough, and the muffler effect of the first-stage amplifier of the diesel engine is poor.

The noise of "bounce, bounce, bounce" and the high decibel value are unbearable, so the traffic control department stipulates that agricultural transport vehicles, tractors, and walking tractors equipped with diesel engines are not allowed to enter the city

[0005] 2. Drivers who drive agricultural transport vehicles, tractors, and walking tractors for a long time also feel physically and mentally exhausted due to noise factors

[0006] 3. The annual production and sales volume of single-cylinder diesel engines is 10 million units, and the market has hundreds of millions of units. When the existing single-cylinder diesel engines are started or idling, the PM particles in the thick smoke exhausted by the muffler are discharged into the atmosphere. , seriously pollute the air and affect the environment

[0007] 4. With the gradual improvement of environmental protection requirements, the revision of national 1, national 2, national 3, national 4 and other standards, the continuous reduction of PM value of the discharge, for manufacturers, the existing emission system is also become more difficult to achieve

[0008] 5. In order to achieve complete combustion and reduce emissions, single-cylinder diesel engines adopt technologies such as direct injection, electric injection or supercharging before emission. It is difficult to meet the requirements for PM particles, and the single-cylinder engine requires simple structure, low cost and low price. The needs of users cannot be the best of both worlds

[0009] 6. The existing diesel muffler adopts oxyacetylene welding process, the production quality is rough, the appearance is not beautiful enough, and the productivity is relatively low

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