CN205330765U - Inclined partition plate silencer inclines - Google Patents

Abstract

The application discloses an inclined partition plate silencer inclines. The scheme does: which comprises a housin, the intake pipe is connected to casing one end, the outlet duct is connected to the casing other end, be equipped with first baffle and second baffle in the casing, it is first, the second baffle is with dividing into inside the casing, three cavity under the neutralization, first baffle is upwards set up by the slope of intake pipe to outlet duct direction, the second baffle is upwards set up by the slope of outlet duct to intake pipe orientation, still be equipped with vertical air duct in the casing, the air duct is the array and evenly sets up on the casing bottom surface, the air duct is last, part in two lower cavities is equipped with the air vent. This patent application is anticipated is providing an inclined partition plate silencer inclines to make the sound wave mesh of stack in order to reach the denoising sound that disappears mutually.

Description

Tilt clapboard acoustic filter

Technical field

This utility model relates to a kind of tilt clapboard 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 tilt clapboard acoustic filter, so that the mutual superposition of sound wave is to reach to eliminate the purpose of noise。

Tilt clapboard acoustic filter in this programme, base case is: include housing, shell one end connects air inlet pipe, the housing other end connects escape pipe, the first dividing plate and second partition it is provided with in housing, first, enclosure interior is divided into by second partition, neutralize lower three chambers, first dividing plate is tilted upward setting by air inlet pipe to escape pipe direction, second partition is tilted upward setting by escape pipe to air inlet pipe direction, vertical airway it is additionally provided with in housing, airway is uniformly arranged in array on housing bottom surface, airway is upper, part in lower two chambers is provided with passage。

Operation principle and beneficial effect: tail gas is entered the lower chambers in housing by air inlet pipe, then entered airway by the air-vent on airway。Owing to airway is uniformly arranged in array on housing bottom surface, thus on case width direction due to airway between have certain distance, the noise generation superposition of generation, reached the purpose abated the noise。Other first dividing plate is tilted upward setting by air inlet pipe to escape pipe direction, and second partition is tilted upward setting by escape pipe to air inlet pipe direction。The sectional area making tail gas circulation in upper and lower chamber is gradually increased, and serves the effect of decompression noise reduction。In sum, this programme provides the benefit that the effect being reached decompression noise reduction by the dividing plate being obliquely installed, and the airway arranged by array makes the mutual superposition of sound wave, reaches the effect of noise reduction。

Scheme 2, as the improvement to base case, is filled with quieter material in middle chamber。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 gross area of airway air-vent in upper chamber is more than the sectional area of escape pipe。Advantage is, it is to avoid produce secondary noise during air-flow via。

Scheme 5, as the improvement to base case, airway at the gross area of the air-vent of bottom chamber more than the sectional area of air inlet pipe。Advantage is, it is to avoid produce secondary noise during air-flow via。

Accompanying drawing explanation

Fig. 1 is the structural representation of this utility model tilt clapboard 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 the 20, first dividing plate 21, airway 22, passage 23, second partition 24, noise reduction glass cotton 30, escape pipe 40。

Embodiment

As shown in Figure 1, tilt clapboard acoustic filter, scheme is: include housing 20, housing 20 one end connects air inlet pipe 10, housing 20 other end connects escape pipe 40, the first dividing plate 21 and second partition 24 it is provided with in housing 20, first, second partition is divided into internal for housing 20, neutralize lower three chambers, first dividing plate 21 is tilted upward setting by air inlet pipe 10 to escape pipe 40 direction, second partition 24 is tilted upward setting by escape pipe 40 to air inlet pipe 10 direction, vertical airway 22 it is additionally provided with in housing 20, airway 22 is uniformly arranged in array on housing 20 bottom surface, airway 22 is upper, part in lower two chambers is provided with passage 23。

It addition, in the present embodiment, quieter material it is filled with in middle chamber。Advantage is, improves the effect of noise reduction further。Quieter material is noise reduction glass cotton 30。Advantage is, cheap and easy to get, and high-temperature resistance is strong。The gross area of the airway 22 air-vent in upper chamber is more than the sectional area of escape pipe 40。Advantage is, it is to avoid produce secondary noise during air-flow via。Airway 22 at the gross area of the air-vent of bottom chamber more than the sectional area of air inlet pipe 10。Advantage is, it is to avoid produce secondary noise during air-flow via。

Tail gas is entered the lower chambers in housing 20 by air inlet pipe 10, is then entered airway 22 by the air-vent 23 on airway 22。Owing to airway 22 is uniformly arranged in array on housing 20 bottom surface, thus on housing 20 width due to airway 22 between have certain distance, the noise generation superposition of generation, reached the purpose abated the noise。Other first dividing plate 21 is tilted upward setting by air inlet pipe 10 to escape pipe 40 direction, and second partition 24 is tilted upward setting by escape pipe 40 to air inlet pipe 10 direction。The sectional area making tail gas circulation in upper and lower chamber is gradually increased, and serves the effect of decompression noise reduction。So, the present embodiment is the effect being reached decompression noise reduction by the dividing plate being obliquely installed, and the airway 22 arranged by array makes the mutual superposition of sound wave, reaches the effect of noise reduction。

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 (5)

1. tilt clapboard acoustic filter, including housing, described shell one end connects air inlet pipe, the described housing other end connects escape pipe, the first dividing plate and second partition it is provided with in described housing, described first, enclosure interior is divided into by second partition, neutralize lower three chambers, it is characterized in that, described first dividing plate is tilted upward setting by air inlet pipe to escape pipe direction, described second partition is tilted upward setting by escape pipe to air inlet pipe direction, vertical airway it is additionally provided with in described housing, described airway is uniformly arranged in array on housing bottom surface, described airway is upper, part in lower two chambers is provided with passage。

2. tilt clapboard acoustic filter according to claim 1, it is characterised in that: it is filled with quieter material in described middle chamber。

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

4. tilt clapboard acoustic filter according to claim 1, it is characterised in that: the gross area of described airway air-vent in upper chamber is more than the sectional area of escape pipe。

5. tilt clapboard acoustic filter according to claim 1, it is characterised in that: described airway at the gross area of the air-vent of bottom chamber more than the sectional area of air inlet pipe。