CN206111279U

CN206111279U - Car premuffler structure

Info

Publication number: CN206111279U
Application number: CN201621160855.1U
Authority: CN
Inventors: 杨鑫
Original assignee: Lifan Industry Group Co Ltd
Current assignee: Lifan Technology Group Co Ltd
Priority date: 2016-10-25
Filing date: 2016-10-25
Publication date: 2017-04-19
Anticipated expiration: 2026-10-25

Abstract

The utility model discloses a car premuffler structure, include cylindric shells and the core pipe that passes cylindric shells, the one end of the gas outlet that the air inlet and the core that are located on cylindric shells's the core pipe pipe wall and are close to the core pipe were respectively managed is equipped with soundproofing hole section I separately, it still is equipped with soundproofing hole section II on the core pipe pipe wall of two sections soundproofing hole sections between I to be located, soundproofing hole section I includes a plurality of soundproofing hole I that are used for making core intraduct and cylindric shells inner chamber communicate, soundproofing hole section II includes a plurality of soundproofing hole II that are used for making core intraduct and cylindric shells inner chamber communicate, soundproofing hole's I diameter is less than soundproofing hole's II diameter, the closeness that is located I last soundproofing hole I of soundproofing hole section is greater than the closenesses that are located II last soundproofing hole II of soundproofing hole section. The utility model discloses simple structure, the soundproofing hole section of constituteing through the soundproofing hole by different diameters sizes, different closenesses has improved sound absorption and noise reduction effect, makes the wavelength coverage of the denoising sound that disappears more broaden, frequency range is wideer, has improved whole car travelling comfort.

Description

Automobile premuffler structure

Technical field

This utility model is related to a kind of automotive muffler, and in particular to a kind of automobile premuffler structure.

Background technology

The exhaust silencer of automobile is the key component of driving noise.Pole of the countries in the world to the noise of various vehicles Limit value has strict regulation, and exhaust silencer is exactly such a device to reduce exhaust noise and life.Exhaust silencer Effect be exactly by reducing, the pulsation of decay pressure at expulsion to be eliminating noise.According to principle of interference, exhaust silencer has suction Receive, reflect two kinds of basic quieter manners.Absorption silencer, by waste gas in sound-absorbings such as glass fibre, steel fibre and asbestos Friction on material and reduce its energy；Reflection muffler then has the harmony chamber of multiple series connection to reflect with the porous of different length Pipe interconnects, waste gas wherein through multiple reflection, collision, expansion, cooling and reduce its pressure, mitigate vibration And energy.

Two acoustic filters are commonly installed in automobile exhaust system：Premuffler and rearmounted acoustic filter.Premuffler base It is resistant noise-reducing device on this, is primarily directed to some specific frequencies；Rearmounted acoustic filter can be resistant noise-reducing device, or Composite muffler, it is used for eliminating the noise of broad frequency band.But at present the premuffler on automobile is generally only in core pipe On open up one section of noise elimination hole section being made up of some diameter identical sound attenuation holes to be eliminated the noise, so not only noise elimination noise reduction effect Bad, in addition the wave-length coverage of elimination noise is few and frequency band is short, affects the comfortableness of car load.

Utility model content

For above-mentioned the deficiencies in the prior art, technical problem to be solved in the utility model is：How to provide one kind to disappear Sound excellent noise reduction effect, improves the automobile premuffler structure of car load comfortableness.

In order to solve above-mentioned technical problem, this utility model employs following technical scheme：

A kind of automobile premuffler structure, including cylinder-like shell and the core pipe through cylinder-like shell, it is characterised in that： Air inlet and the core pipe on the core pipe tube wall in the cylinder-like shell and respectively close to the core pipe goes out One end of QI KOU is each provided with noise elimination hole section I, and on the core pipe tube wall between two sections of noise elimination hole sections I sound attenuation hole is additionally provided with Section II, the noise elimination hole section I include it is some for make inside the core pipe with the sound attenuation hole of the cylinder-like shell inner space I, the noise elimination hole section II include it is some for make inside the core pipe with the sound attenuation hole II of the cylinder-like shell inner space, , less than the diameter of the sound attenuation hole II, the sound attenuation hole I is intensive in the noise elimination hole section I for the diameter of the sound attenuation hole I Degree is more than the closeness positioned at the sound attenuation hole II in the noise elimination hole section II.

In this utility model, it is provided with intensive by different-diameter size, difference in the core pipe in cylinder-like shell The noise elimination hole section of the sound attenuation hole composition of degree.The diameter of sound attenuation hole is different, and the wavelength that can eliminate noise is just differed, thus carried The high wave-length coverage for eliminating noise.The closeness of sound attenuation hole is different, for noise frequency just differ, which improves Eliminate the frequency band of noise.Additionally by noise elimination hole section I and the step-by-step arrangement of noise elimination hole section II, it becomes possible in eliminating gas extraction system The noise of most low and medium frequency, noise elimination noise reduction effect is good, improves car load comfortableness.

Used as optimization, the cylinder-like shell is near gas outlet one end of the core pipe along the cylinder-like shell axial direction side To being gradually reduced to overall diameter.Waste gas after this cylinder-like shell inner chamber is entered into, because core pipe is to cylinder-like shell inclined-plane Section the distance between shell wall is differed, then sound is also in the time that Jing cylinder-like shell bevel phase shell walls are reflected Differ, noise elimination effect can be strengthened.

As optimization, cover on the inner surface of the cylinder-like shell straightway and be bonded with sound absorption cotton.When noise When sound wave passes through noise elimination cotton, acoustic wave energy is absorbed by noise elimination cotton and is changed into heat energy, and used as dissipative muffler, the main high frequency that absorbs is made an uproar Sound and frequency band is wider.In addition sound absorption cotton has corrosion-resistant function, can adapt to working environment severe in acoustic filter, increases The ability of sqouynd absorption lowering noise.

As optimization, in the core pipe in the cylinder-like shell and near air inlet one end of the core pipe also It is provided with the quarter-wave long tube with the core pipe inner space, axial direction and the core pipe of the quarter-wave long tube Axial direction it is perpendicular, the quarter-wave long tube is located at the noise elimination hole section in core pipe projection in the radial direction I outside core pipe projection in the radial direction.Quarter-wave long tube can eliminate the higher noise of frequency, make noise elimination disappear The frequency band for removing is wider.

In sum, the beneficial effects of the utility model are：This utility model simple structure, by big by different-diameter The noise elimination hole section of the sound attenuation hole composition of little, different closenesses improves noise elimination noise reduction effect, makes the wave-length coverage of elimination noise more Extensively, frequency band is wider, improves car load comfortableness.

Description of the drawings

In order that the purpose of utility model, technical scheme and advantage are clearer, it is new to this practicality below in conjunction with accompanying drawing Type is described in further detail, wherein：

Fig. 1 is structural representation of the present utility model.

Specific embodiment

Below in conjunction with the accompanying drawings the utility model is described in further detail.

As shown in figure 1, the automobile premuffler structure in this specific embodiment, including cylinder-like shell 1 and through circle The core pipe 2 of cylindrical case 1, on the tube wall of the core pipe 2 in the cylinder-like shell 1 and respectively close to the core pipe 2 One end of the gas outlet of air inlet and the core pipe 2 is each provided with noise elimination hole section I 3, the institute between two sections of noise elimination hole sections I 3 State and noise elimination hole section II 4 is additionally provided with the tube wall of core pipe 2, the noise elimination hole section I 3 includes some for making the inside of the core pipe 2 and institute The sound attenuation hole I of the inner space of cylinder-like shell 1 is stated, the noise elimination hole section II 4 includes some for making the inside of the core pipe 2 and institute The sound attenuation hole II of the inner space of cylinder-like shell 1 is stated, the diameter of the sound attenuation hole I is located at less than the diameter of the sound attenuation hole II The closeness of the sound attenuation hole I is close more than the sound attenuation hole II in the noise elimination hole section II 4 in the noise elimination hole section I 3 Intensity.

In this specific embodiment, the cylinder-like shell 1 is near gas outlet one end of the core pipe 2 along the cylindrical shape The axial direction of shell 1 is gradually reduced to overall diameter.

In this specific embodiment, cover on the inner surface of the straightway of the cylinder-like shell 1 and be bonded with sound absorption cotton 5。

In this specific embodiment, in the core pipe 2 in the cylinder-like shell 1 and near the core pipe 2 Air inlet one end is additionally provided with the quarter-wave long tube 6 with the inner space of the core pipe 2, the axle of the quarter-wave long tube 6 It is perpendicular with the axial direction of the core pipe 2 to direction, the quarter-wave long tube 6 in the core pipe 2 in the radial direction Projection is positioned at the noise elimination hole section I 3 outside the projection in the radial direction of the core pipe 2.

During being embodied as, the quantity of the noise elimination hole section II 4 is two sections and interval setting.So can be more preferable Elimination noise.

Finally illustrate, above example is only unrestricted to illustrate the technical solution of the utility model, although logical Cross this utility model is described with reference to preferred embodiment of the present utility model, but one of ordinary skill in the art It should be appreciated that various changes can be made to it in the form and details, without departing from appended claims institute The spirit and scope of the present utility model for limiting.

Claims

1. a kind of automobile premuffler structure, including cylinder-like shell and the core pipe through cylinder-like shell, it is characterised in that：Position The outlet of air inlet and the core pipe on the core pipe tube wall in the cylinder-like shell and respectively close to the core pipe One end of mouth is each provided with noise elimination hole section I, and on the core pipe tube wall between two sections of noise elimination hole sections I noise elimination hole section is additionally provided with II, the noise elimination hole section I include it is some for make inside the core pipe with the sound attenuation hole I of the cylinder-like shell inner space, The noise elimination hole section II include it is some for make inside the core pipe with the sound attenuation hole II of the cylinder-like shell inner space, institute State the diameter of the diameter less than the sound attenuation hole II of sound attenuation hole I, the closeness of the sound attenuation hole I in the noise elimination hole section I More than the closeness positioned at the sound attenuation hole II in the noise elimination hole section II.

2. automobile premuffler structure according to claim 1, it is characterised in that：The cylinder-like shell is near the core Gas outlet one end of pipe is gradually reduced along the cylinder-like shell axial direction to overall diameter.

3. automobile premuffler structure according to claim 2, it is characterised in that：Positioned at the cylinder-like shell straightway Inner surface on cover be bonded with sound absorption cotton.

4. automobile premuffler structure according to claim 1, it is characterised in that：Institute in the cylinder-like shell State in core pipe and be additionally provided with the quarter-wave long tube with the core pipe inner space, institute near air inlet one end of the core pipe The axial direction for stating quarter-wave long tube is perpendicular with the axial direction of the core pipe, and the quarter-wave long tube is described Core pipe projection in the radial direction is positioned at the noise elimination hole section I outside core pipe projection in the radial direction.