An expansion resonance compound muffler

Abstract

The invention discloses an expansion resonance composite muffler, which comprises a sleeve, one end of the sleeve is closed and inserted into an air inlet pipe radially, and an air outlet pipe is arranged axially at the other end; inside the sleeve, four partitions are sequentially arranged in parallel, and the The inside of the sleeve is divided into five chambers; the intubation tube extends from the first chamber to the third chamber, the perforated tube extends from the third chamber to the second chamber and is closed by the partition I, and the middle tube is extended from the second chamber. The second chamber extends into the fourth chamber, and the resonance cavity insertion tube extends from the fourth chamber into the fifth chamber; a plurality of through holes I are provided on the side wall of the air inlet pipe; the side wall of the perforated pipe is located in the second chamber The area is provided with multiple vias II. Through the reasonable combination of expansion and resonance, the present invention can greatly reduce the low-medium frequency noise of the airflow while taking into account the high-frequency noise reduction effect, obtain a larger noise reduction amount and a wider noise reduction frequency band, and effectively reduce the exhaust noise. At the same time, the structural pressure The loss is small, the impact on the engine power loss is small, the design is reasonable, and it has a good application prospect.

Description

technical field [0001] The invention relates to the field of vibration reduction and noise reduction, in particular to an expansion resonance composite muffler for engineering machinery. Background technique [0002] The muffler is installed on the engine exhaust pipe, and its main function is to reduce the exhaust noise of the engine, so as to reduce the noise around the driver's ear and the sound radiation to the external environment, effectively reduce the exhaust noise, reduce the environmental pollution caused by noise, and improve the operating comfort sex. [0003] Due to the limitation of the installation space of construction machinery vehicles, in order to obtain good noise reduction in the existing design of diesel engine exhaust mufflers, the internal structure is generally relatively complicated, and the exhaust back pressure is large, resulting in large engine power loss and fuel consumption. Big, polluting the environment. The construction machinery industry...

AI Technical Summary

Problems solved by technology

[0003] Due to the limitation of the installation space of construction machinery vehicles, in order to obtain good noise reduction in the existing design of diesel engine exhaust mufflers, the internal structure is generally relatively complicated, and the exhaust back pressure is large, resulting in large engine power loss and fuel consumption. large, polluting the environment

The construction machinery industry has relatively strict requirements on noise limits. The noise generated by the engine accounts for a large part of the noise generated by the whole machine. Therefore, the role of the muffler is very important. However, the noise reduction effect of the existing muffler is generally not ideal for low-frequency noise. Noise is the main noise source of the whole machine

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