CN205330766U

CN205330766U - Aperture high frequency silencer

Info

Publication number: CN205330766U
Application number: CN201521026053.7U
Authority: CN
Inventors: 沈文
Original assignee: CHONGQING YUKANG MACHINERY Co Ltd
Current assignee: CHONGQING YUKANG MACHINERY Co Ltd
Priority date: 2015-12-12
Filing date: 2015-12-12
Publication date: 2016-06-22
Anticipated expiration: 2025-12-12

Abstract

The application discloses an aperture high frequency silencer. The scheme does: including the casing, the intake pipe is connected to casing one end, and the outlet duct is connected to the casing other end, is equipped with vertical baffle in the casing, and the baffle falls into two left and right cavities with the casing is inside, has evenly laid the aperture on the baffle, and the whole area of aperture is greater than the sectional area of intake pipe, is equipped with the guide plate in the right cavity, and the guide plate is provided with noise damping layer at the radially crisscross runner that forms the S -shaped in making right cavity that sets up of right cavity on the guide plate. This patent application is anticipated is providing an aperture high frequency silencer to the principle of utilizing the aperture muffler improves the effect of amortization.

Description

Aperture high frequency acoustic filter

Technical field

This utility model relates to a kind of aperture high frequency acoustic filter。

Background technology

Noise is one of three major source of pollution, and the noise that motor vehicles radiate accounts for the 75% of whole environmental noise power。Therefore, the noise reducing motor vehicles itself is to reduce the approach that urban environment noise is the most basic。And exhaust noise is the main noise source of automobile and electromotor, often higher 10dB (A) than electromotor total noise of centrifuge (except exhaust noise)～15dB (A)。Control to engine exhaust noise, it is possible to be divided into two aspects: can noise source itself being taken measures on the one hand, these needs are started with from noise source Analysis on Mechanism, take corresponding countermeasure；Measure on the other hand includes adopting exhaust silencer and controlling the mechanical noise transmitted by enmgine exhaust。Wherein, most effective, simplest is adopt exhaust silencer。One good acoustic filter should meet the following conditions: 1. acoustic attenuation performance is good, in the whole frequency range of exhaust noise, should have enough sound deadening capacities, avoids producing reproduced air-flow noise simultaneously as far as possible；2. drag losses is little, and namely the power of acoustic filter consumption of engine is little as far as possible；3. can be high temperature resistant, corrosion-resistant, good mechanical property, reliable operation, long service life, housing and internal partition good rigidity, in case exciting judder radiated noise。

Resistive, resistance and impedance composite muffler three class can be divided into by noise elimination mechanism。Dissipative muffler is suitably to arrange sound-absorbing material in pipeline, partially absorbs the acoustic energy propagated in pipeline, has good soundproof effect within the scope of medium-high frequency。Reactive muffler is the combination of pipeline or the resonant cavity utilizing variously-shaped, size, impedance mismatching when causing sound wave to propagate in systems, makes sound wave reflection occur in pipeline and resonant cavity or interfere, thus reducing the acoustic energy of output。The noise elimination frequency band of reactive muffler is narrower, and better at medium and low frequency soundproof effect, high frequency is poor。Impedance composite muffler is that resistive and reactive muffler are combined, and is respectively provided with good soundproof effect from low frequency, intermediate frequency to high frequency。

Current modal automobile exhaust muffler mostly is impedance complex formula structure, utilizes the helmholtz resonance chamber in resistance chamber and wavelength tube to eliminate the noise of medium and low frequency section, utilizes the sound-absorbing material in resistive chamber to absorb the noise of medium-high frequency section。When considering engine exhaust, air-flow velocity is significantly high, and the high speed pulse pneumatic of aerofluxus can produce aerodynamic noise, also can produce structural radiation noise by excited vibrational when this high speed pulse pneumatic impulse piping, housing and dividing plate。

For the problems referred to above, the patent document that publication number is CN204729151U discloses a kind of automotive muffler, its technical scheme is: include housing, it is arranged on the air inlet pipe in housing, exhaustor and arm, one end of described air inlet pipe and arm forms the first anechoic chamber, and the other end of described arm and exhaustor form the second anechoic chamber, are provided with screw rod in described exhaustor, the outer surface of described housing is provided with buffer layer, in described air inlet pipe, exhaustor and arm, is respectively arranged with muffle coating。

In the technical scheme of above-mentioned patent, only by the sound deadening of noise reduction decompression and silencing cotton to reducing tail gas noise, erasure effect is limited。

Utility model content

This utility model is intended to provide a kind of aperture high frequency acoustic filter, to utilize the principle of aperture deafener to improve the effect of noise reduction。

Aperture high frequency acoustic filter in this programme, base case is: include housing, shell one end connects air inlet pipe, and the housing other end connects escape pipe, is provided with vertical dividing plate in housing, enclosure interior is divided into left and right two chambers by dividing plate, uniformly being laid with aperture on dividing plate, the gross area of aperture, more than the sectional area of air inlet pipe, is provided with deflector in right chamber, deflector makes to be formed in right chamber the runner of S shape in the radially staggered setting of right chamber, and deflector is provided with noise reduction layer。

Operation principle and beneficial effect: tail gas is entered housing by air inlet pipe, initially enter left chamber, due to the increase in cross section so that air velocity reduces, and serves the effect of decompression noise reduction。Owing to being provided with aperture on dividing plate, the gross area of aperture is more than the sectional area of air inlet pipe, and when air-flow is through small holes, the frequency of noise can increase, and makes the audible part in frequency spectrum reduce, thus reducing the impact on people。Further, since deflector forms the runner of S shape in right chamber, and deflector is provided with noise reduction layer so that air-flow extends in the distance of housing, makes noise reduction layer can better reduce noise。In sum, this programme provides the benefit that the frequency being improved noise by aperture, then utilizes deflector to extend air-flow at the stroke of housing, improves the effect abated the noise again through noise reduction layer。

Scheme 2, as the improvement to base case, housing is externally provided with quieter material。Advantage is, improves the effect of noise reduction further。

Scheme 3, as the improvement to scheme 2, quieter material is noise reduction glass cotton。Advantage is, cheap and easy to get, and high-temperature resistance is strong。

Scheme 4, as the improvement to base case, the sectional area of housing is more than the twice in air inlet pipe cross section。Advantage is, improves the effect of left chamber's decompression noise reduction。

Scheme 5, as the improvement to base case, the sectional area of housing is more than the twice in escape pipe cross section。Advantage is, improves the speed given vent to anger and avoids affecting engine efficiency。

Accompanying drawing explanation

Fig. 1 is the structural representation of this utility model aperture high frequency acoustic filter embodiment。

Detailed description of the invention

Below by detailed description of the invention, this utility model is described in further detail:

Accompanying drawing labelling in Figure of description includes: air inlet pipe 10, housing 20, dividing plate 30, aperture 31, deflector 40, escape pipe 50。

Embodiment

As shown in Figure 1, aperture high frequency acoustic filter, scheme is: include housing 20, housing 20 one end connects air inlet pipe 10, housing 20 other end connects escape pipe 50, vertical dividing plate 30 it is provided with in housing 20, dividing plate 30 is divided into left and right two chambers by internal for housing 20, dividing plate 30 is uniformly laid with aperture 31, the gross area of aperture 31 is more than the sectional area of air inlet pipe 10, being provided with deflector 40 in right chamber, deflector 40 makes to be formed in right chamber the runner of S shape in the radially staggered setting of right chamber, and deflector 40 is provided with noise reduction layer。

It addition, in the present embodiment, housing 20 is externally provided with quieter material。Advantage is, improves the effect of noise reduction further。Quieter material is noise reduction glass cotton。Advantage is, cheap and easy to get, and high-temperature resistance is strong。The sectional area of housing 20 is more than the twice in air inlet pipe 10 cross section。Advantage is, improves the effect of left chamber's decompression noise reduction。The sectional area of housing 20 is more than the twice in escape pipe 50 cross section。Advantage is, improves the speed given vent to anger and avoids affecting engine efficiency。

Tail gas is entered housing 20 by air inlet pipe 10, initially enters left chamber, due to the increase in cross section so that air velocity reduces, and serves the effect of decompression noise reduction。Owing to being provided with aperture 31 on dividing plate 30, the gross area of aperture 31 is more than the sectional area of air inlet pipe 10, and when air-flow is through small holes, the frequency of noise can increase, and makes the audible part in frequency spectrum reduce, thus reducing the impact on people。Further, since deflector 40 forms the runner of S shape in right chamber, and deflector 40 is provided with noise reduction layer so that air-flow extends in the distance of housing, makes noise reduction layer can better reduce noise。So, the present embodiment is the frequency being improved noise by aperture 31, then utilizes deflector 40 to extend the air-flow stroke at housing 20, improves the effect abated the noise again through noise reduction layer。

Above-described is only embodiment of the present utility model, and in scheme, the general knowledge such as known concrete structure and/or characteristic does not do too much description at this。Should be understood that; for a person skilled in the art, under the premise without departing from this utility model structure, it is also possible to make some deformation and improvement; these also should be considered as protection domain of the present utility model, and these are all without affecting effect and the practical applicability that this utility model is implemented。The protection domain that this application claims should be as the criterion with the content of its claim, and the detailed description of the invention in description etc. records the content that may be used for explaining claim。

Claims

1. aperture high frequency acoustic filter, including housing, described shell one end connects air inlet pipe, the described housing other end connects escape pipe, vertical dividing plate it is provided with in described housing, enclosure interior is divided into left and right two chambers by described dividing plate, it is characterized in that, described dividing plate is uniformly laid with aperture, the gross area of described aperture is more than the sectional area of air inlet pipe, being provided with deflector in described right chamber, described deflector makes to be formed in right chamber the runner of S shape in the radially staggered setting of right chamber, and described deflector is provided with noise reduction layer。

2. aperture high frequency acoustic filter according to claim 1, it is characterised in that: described housing is externally provided with quieter material。

3. aperture high frequency acoustic filter according to claim 2, it is characterised in that: described quieter material is noise reduction glass cotton。

4. aperture high frequency acoustic filter according to claim 1, it is characterised in that: the sectional area of described housing is more than the twice in air inlet pipe cross section。

5. aperture high frequency acoustic filter according to claim 1, it is characterised in that: the sectional area of described housing is more than the twice in escape pipe cross section。