Noise abatement device of engine air inlet system

Abstract

The invention relates to the technical field of noise abatement, and discloses a noise abatement device of an engine air inlet system. The noise abatement device comprises an outer shell and an inner pipe. The outer shell comprises an air inlet, an air outlet and a protruding part. The inner pipe is arranged in the outer shell in a sleeved manner and is fixedly connected with the inner wall of the outer shell at the positions of an inlet and an outlet of the inner pipe. After flowing into the outer shell from the air inlet, inflow air of an engine totally flows through the inner pipe and then flows out of the air outlet. The inner pipe and the protruding part are matched to form a cavity, and the cavity is divided by partition plates into at least two noise abatement chambers arranged in the inflow air flowing direction of the engine. The surface of the position, corresponding to each noise abatement chamber, of the inner pipe is provided with noise abatement holes communicating with the interior of the inner pipe and the noise abatement chamber. The noise abatement center frequencies of the noise abatement chambers are different. The noise abatement device of the engine air inlet system has a good noise abatement effect on inflow air noise with the wide frequency, connecting and arranging in the air inlet system are facilitated, and using is convenient.

Description

technical field [0001] The invention relates to the technical field of noise reduction, in particular to a noise reduction device for an engine intake system. Background technique [0002] The noise in the engine intake system is mainly caused by the pressure fluctuations caused by the periodic opening and closing of the intake valve. With the use of turbochargers in the intake system, the noise of the intake system is further aggravated, and the frequency of the intake noise is also broadened. In order to reduce the noise of the intake system, major manufacturers are committed to eliminating or reducing intake noise by adding relevant mufflers to the intake pipeline. [0003] At present, the mufflers widely used in the air intake system mainly include Helmtz resonant cavity, 1 / 4 wavelength tube, 1 / 2 wavelength tube and other branch resonance type mufflers. The Chinese patent publication number is CN102367791A. A typical 1 / 4 wavelength tube muffler, its structure is as fol...

AI Technical Summary

Problems solved by technology

Compared with the case where the 1 / 4 wavelength tube is used alone, this solution has a better noise reduction effect, but it requires a higher layout space, and the preset noise reduction cannot be achieved in the exhaust system because it is difficult to meet the layout requirements. sound effect

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