A frequency-adjustable single-stage multi-frequency resonance muffler

Abstract

The invention discloses a frequency-adjustable type single-pole multi-frequency resonance muffler. According to the frequency-adjustable type single-pole multi-frequency resonance muffler, a pluralityof noise elimination peak values are in a concerned frequency band, and the noise elimination frequency range can be adjusted. According to the single-pole muffler, a shell part is composed of a fixed shell and a movable shell, and the movable shell can move in a certain range. An even number of pieces of fixed inserting plates and movable inserting plates (above six pieces) are axially insertedin a hollow cavity formed by an exhaust pipe and the two shells, the fixed inserting plates and the movable inserting plates are tightly attached to one another to divide the hollow cavity into an even number (above six) of parallel resonant cavities, a different number of noise elimination holes are formed in the exhaust pipe in the axial direction to form an even number (above six) of parallel resonant cavities, and the number of the cavities is equal to the number of the resonant frequencies. A plurality of coupled holes are formed in the fixed inserting plates, and the fixed inserting plates with the coupled holes and the fixed inserting plates without the coupled holes are arranged at intervals. According to the design, the movable shell can be adjusted to change the range of the noise elimination frequency band. According to the frequency-adjustable type single-pole multi-frequency resonance muffler, a serial-parallel resonant noise elimination structure is constructed in a limited space of the single-pole muffler, and the noise elimination effect is greatly improved.

Description

technical field [0001] The invention belongs to an exhaust muffler, in particular to a frequency-adjustable single-stage multi-frequency resonance muffler, which can be used in a vehicle intake and exhaust muffler system and other exhaust pipeline noise reduction systems. Background technique [0002] Traditional muffler designs are usually divided into two types: resistive and resistive. Resistive mufflers use sound waves to propagate in sound-absorbing materials to convert sound energy into heat energy for loss; however, in order to obtain better low-frequency sound-absorbing performance, a larger back cavity space and thicker material size are often required. The Helmholtz resonance muffler in the resistant muffler has a very strong frequency selectivity. Although the noise reduction at the resonance frequency is large, its noise reduction frequency band is very narrow. In order to broaden the noise reduction frequency band, it generally requires multi-stage combination. ...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems existing in the prior art, the present invention provides a frequency-adjustable single-stage multi-frequency resonance muffler. There will be multiple peaks of noise reduction in the frequency band concerned, and the noise reduction frequency can be changed by adjusting the volume of the resonance cavity. range, which solves the problem that a single Helmholtz resonator has a narrow anechoic frequency band and a wide range of applications

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