Impedance compound muffler

Abstract

The invention discloses an impedance compound muffler. The impedance compound muffler comprises a cavity structure, the cavity structure is formed by a shell, a front end cover and a rear end cover and is separated into a first cavity body, a second cavity body, a third cavity body and a fourth cavity body by a first partition plate I, a second partition plate II and a third partition plate III, the first cavity body is provided with an inlet tube, the fourth cavity body is provided with an outlet tube, a plurality of insert tubes are arranged on the first partition plate I and communicate the first cavity body with the second cavity body, a perforation pipe is fixed on the first partition plate I and the second partition plate II, an inlet of the perforation pipe is positioned in the second cavity body, an outlet of the perforation pipe is positioned in the fourth cavity body, and small holes are uniformly distributed in the middle area of the part in the third cavity body. The impedance compound muffler has the advantages that by means of reasonably combining expansion and resonance, an effect of lowering noise of an air flow in low and intermediate frequencies and an effect of eliminating noise in high frequency are achieved, and a large noise elimination quantity and a wide noise elimination frequency band are acquired; the impedance compound muffler is low in pressure loss and power consumption, simple and easy to implement, convenient to machine and high in economic performance.

Description

technical field [0001] The invention relates to a muffler for engineering machinery, in particular to an impedance compound muffler. Background technique [0002] The muffler is a device that attenuates air transmission and allows airflow to pass through. It is installed on the engine exhaust pipe. Its main function is to reduce the exhaust noise of the engine, reduce vibration, reduce the noise near the driver's ears in the cab and the radiation noise outside the machine, and improve the performance of the driver. operating comfort. The design of the muffler should take into account the requirements of its acoustic performance, aerodynamic performance and economy. [0003] In the existing diesel engine mufflers, in order to obtain good noise reduction, the structural design is usually more complicated, the air flow resistance is large, the cost increases and the engine power loss increases, and the fuel consumption increases, resulting in greatly reduced aerodynamic perfor...

AI Technical Summary

Problems solved by technology

[0003] In the existing diesel engine mufflers, in order to obtain good noise reduction, the structural design is usually more complicated, the air flow resistance is large, the cost increases and the engine power loss increases, and the fuel consumption increases, resulting in greatly reduced aerodynamic performance and pollution. environment; and there are few structures in the existing mufflers that can effectively reduce low-frequency noise, and low-mid-frequency exhaust noise is the main noise source of the whole machine

Images