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

An adjustable, multi-frequency technology, applied in the direction of intake mufflers, mufflers, machines/engines, etc., can solve the problems of a single Helmholtz resonator with a narrow muffler frequency band and a limited range of applications, and improve the application Small range, improved noise reduction, and overcome the effect of occupying a large space

CN109488416BActive Publication Date: 2021-01-15JIANGSU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-01-15

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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.
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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. ...

Examples

Embodiment Construction

[0030] The present invention will be further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited thereto.

[0031] Such as figure 1 , 2 , 3, a frequency-adjustable single-stage multi-frequency resonance muffler, comprising an exhaust pipe 1, a hollow fixed housing 2 with an end cap on one end, a movable housing 3 hollow and an end cap on one end ( The end cover here adopts sealing ring 4 to ensure the sealing of the resonance cavity), sealing ring 4, fixed board 7 and movable board 8; the outer side of exhaust pipe 1 is covered with fixed housing 2, and the inner diameter of movable housing 3 is slightly Larger than the outer diameter of the fixed shell 2, the open end of the movable shell 3 is overlaid on the open end of the fixed shell 2. After the fixed shell 2 and the movable shell 3 are socketed, the sealing ring 4 is used to seal, and the movable The other end of the casing 3 is sleeved on the ...