Multicavity resonance muffler

Abstract

The invention provides a multicavity resonance muffler which solves the technical problem that a superchargerof the conventional supercharged engine produces high-frequency noise during low-speed instant acceleration. The multicavity resonance muffler is characterized in that a barrel is a conical barrel of which the diameter of an air flow outlet is less than that of an air flow inlet; a circular table-shaped inner cavity is formed in the barrel; a barrel wall is ofa two-layer structure with a cavity interlayer spaced; a plurality of annular radial partition plates are arranged in the interlayer; the cavity interlayer is divided into a plurality of annular cavities distributed along the axial direction by the radial partition plates; and strip-type muffle holes of different widths are formed in an inner layer barrel wall, and are formed in a staggered manner along the circumferential direction of the inner layer barrel wall. Mutual interferencecaused by the resonance of the strip-type muffle holes of the various resonant cavities are avoided; in addition, the resonant cavity volumes of various sections ofresonant and mufflingcavitiesare changed with the design of the outer wall of the conical barrel; the specific noise elimination bandwidth of each resonant cavity is regulated effectively; the noise reduction effect of the overall structure is improved; and the NVH (Noise Vibration and Harshness) of a finished automobile is improved effectively.

Description

technical field [0001] The invention relates to a noise reduction structure for an internal combustion engine, in particular to a multi-cavity resonance muffler for an automobile engine supercharger. Background technique [0002] At present, with the popularization of family cars, consumers no longer only stay at the level of excellent performance, reliability and durability for family cars, and the requirements for vehicle NVH (abbreviation for noise, vibration and harshness) have been raised to the design assessment requirements of various car manufacturers Above all, the engine, as the power core of the vehicle, not only provides power for the vehicle, but also becomes the main source of noise for the vehicle. Among them, when the supercharged engine accelerates at low speed instantaneously, high-frequency noise is generated because the working point of the supercharger is close to the critical surge area. Due to its generation mechanism, it cannot be avoided, so it needs...

AI Technical Summary

Problems solved by technology

It solves the technical problem that the existing supercharged engine muffler cannot further reduce the high-frequency noise generated during low-speed transient acceleration. It effectively reduces the noise generated by the engine supercharger during low-speed transient acceleration through multiple sets of resonance cavities, and improves the overall performance. Vehicle NVH

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