CN203835495U - Automobile exhaust system noise abatement device - Google Patents

Abstract

The utility model provides an automobile exhaust system noise abatement device. The automobile exhaust system noise abatement device comprises an exhaust pipe, and is characterized in that the exhaust pipe is sleeved with a silencer shell, a resonant cavity is formed between the silencer shell and the exhaust pipe, the part, in the resonant cavity, of the exhaust pipe is sleeved with a sleeve, a cavity is formed between the sleeve and the exhaust pipe, the part, in the cavity, of the exhaust pipe is provided with a first hole, and the sleeve is provided with a second hole; the first hole is formed in the end, close to an air inlet, of the exhaust pipe, and the second hole is formed in the other end, close to an air outlet of the exhaust pipe, of the sleeve. The automobile exhaust system noise abatement device is small in integral size, the low-frequency noise reduction effect is obvious, and the noise reduction frequency range is wide; the structure is simple, and the technology is easy to achieve; the noise in an automobile is reduced by reducing the automobile exhaust pipe idling base frequency and the harmonic frequency component noise of the automobile exhaust pipe, and the standard about taking comfort in the automobile can be reached.

Description

A kind of automobile exhaust system silencer

Technical field

The utility model relates to field of automobile, refers to especially a kind of automobile exhaust system silencer.

Background technique

Automobile exhaust system noise is one of car load Main Noise Sources, and along with the raising that people require car load NVH, what the control of exhaust sound was become is more and more important, and people are the major criterions to this car Quality classification to the impression of the idle noise of vehicle.Idle noise medium and low frequency composition often accounts for leading role, if there is a good low-frequency resonance silencing apparatus, the idle noise in exhaust will have significantly reduction, and the Quality classification of car also has qualitative leap.But general low-frequency resonance device all exists, the required volume of noise elimination is large, noise elimination frequency band is narrow and near the low problem of sound deadening capacity of resonant frequency.Due to chassis spatial constraints, also make thus a lot of narrow limitation that is designed with of this traditional low-frequency resonance device.

Model utility content

The technical problems to be solved in the utility model is to provide a kind of automobile exhaust system silencer, solve low-frequency resonance device of the prior art exist eliminate the noise that required volume is large, noise elimination frequency band is narrow and resonant frequency near the low problem of sound deadening capacity.

For solving the problems of the technologies described above, embodiment of the present utility model provides a kind of automobile exhaust system silencer, comprise outlet pipe, on described outlet pipe, be arranged with a suppressor case, between described suppressor case and described outlet pipe, be formed with resonant cavity, on described outlet pipe in described resonant cavity, be also arranged with a sleeve, between described sleeve and described outlet pipe, be formed with a cavity, on described outlet pipe in described cavity, be provided with first kind perforate, on described sleeve, be provided with Equations of The Second Kind perforate.

Wherein, described first kind perforate is positioned at the end of close suction port on described outlet pipe, and described Equations of The Second Kind perforate is positioned at the other end of close described outlet pipe air outlet on described sleeve.

Wherein, described first kind perforate and Equations of The Second Kind perforate include a plurality of perforates; Described first kind perforate is circumferentially uniform along outlet pipe, and described Equations of The Second Kind perforate is circumferentially uniform along sleeve.

Wherein, the diameter of described first kind perforate is less than the diameter of Equations of The Second Kind perforate.

Wherein, between described resonant cavity and described sleeve, meet following relation, wherein, f is the CF center frequency that described automobile exhaust system silencer need to abate the noise, the cavity volume that V is resonant cavity, S _cfor the section area of sleeve, l _cfor the length of sleeve, c is the velocity of sound:

$f=\frac{c}{2\mathrm{\π}}\sqrt{\frac{S_c}{{\mathrm{Vl}}_c}}.$

The beneficial effect of technique scheme of the present utility model is as follows:

In such scheme, this device overall volume is small and exquisite, and low frequency noise reduction is remarkable, noise reduction wide frequency range; Simple in structure, technique easily realizes; By reducing automobile exhaust pipe idling fundamental frequency and harmonics ingredient noise thereof, thereby reduce internal car noise, reach the standard of ride comfort in car.

Accompanying drawing explanation

Fig. 1 is the structural drawing of the utility model embodiment's automobile exhaust system silencer.

［ primary component symbol description ］

1: outlet pipe;

101: first kind perforate;

2: resonance box;

3: sleeve;

301: Equations of The Second Kind perforate;

4: cavity;

5: resonant cavity.

Embodiment

For making the technical problems to be solved in the utility model, technological scheme and advantage clearer, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.

The utility model for low-frequency resonance device of the prior art exist eliminate the noise that required volume is large, noise elimination frequency band is narrow and resonant frequency near the low problem of sound deadening capacity, a kind of automobile exhaust system silencer is provided.

As shown in Figure 1, a kind of automobile exhaust system silencer that the utility model embodiment provides, comprises outlet pipe 1, and one end of outlet pipe is suction port (being the left end of outlet pipe 1 in figure), and the other end is air outlet (being the right-hand member of outlet pipe 1 in figure).On described outlet pipe 1, be arranged with a suppressor case 2, between described suppressor case 2 and described outlet pipe 1, be formed with resonant cavity 5, on described outlet pipe 1 in described resonant cavity 5, be also arranged with a sleeve 3, between described sleeve 3 and described outlet pipe 1, be formed with a cavity 4, on described outlet pipe 1 in described cavity 4, be provided with first kind perforate 101, on described sleeve 3, be provided with Equations of The Second Kind and open 301.

As shown in Figure 1, described first kind perforate 101 is positioned at the end of close suction port on described outlet pipe 1, described Equations of The Second Kind perforate 301 is positioned at the other end of close described outlet pipe 1 air outlet on described sleeve 3, by first kind perforate 101 and Equations of The Second Kind perforate 301 setting that keeps at a certain distance away, make air-flow in the interior motion of sleeve pipe 3, sleeve pipe 3 plays one's part to the full, and plays Noise Reduction.Described first kind perforate 101 and Equations of The Second Kind perforate 301 include a plurality of perforates; Described first kind perforate 101 is circumferentially uniform along outlet pipe 1, and described Equations of The Second Kind perforate 301 is circumferentially uniform along sleeve 3, and uniform setting can make air-flow turnover evenly, improves stability.The diameter of described first kind perforate 101 is less than the diameter of Equations of The Second Kind perforate 301.

Noise in outlet pipe 1 enters in sleeve 3 by first kind perforate 101, noise enter sleeve 3 interior after Equations of The Second Kind perforate 301 by the sleeve 3 interior the other ends enter in the cavity of resonant cavity 5, thereby low-frequency noise is eliminated, idle noise is reduced, and resonant frequency can regulate by punching rate, sleeve diameter and length.The formula of the resonant frequency that the present embodiment provides is

$f=\frac{c}{2\mathrm{\π}}\sqrt{\frac{S_c}{{\mathrm{Vl}}_c}}$

Wherein, S _cfor the section area (this place shows as punching rate) of sleeve, the cavity volume that V is resonance box (this place is for removing the volume after outlet pipe), l _cfor sleeve is along the axial length of outlet pipe, c is the velocity of sound, specifically can be according to formula calculate velocity of sound size, T represents Current Temperatures in outlet pipe (unit for ℃) here.By this formula, the frequency range that system will be eliminated as required, for example, the CF center frequency abating the noise as required, designs corresponding sleeve section area S according to above formula _c, the cavity volume V of resonance box and length sleeve l _c, can reach good noise reduction.

The utility model overall volume is small and exquisite, and low frequency noise reduction is remarkable, noise reduction wide frequency range; Simple in structure, technique easily realizes; By reducing automobile exhaust pipe idling fundamental frequency and harmonics ingredient noise thereof, thereby reduce internal car noise, reach the standard of ride comfort in car.

The above is preferred implementation of the present utility model; should be understood that; for those skilled in the art; do not departing under the prerequisite of principle described in the utility model; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.

Claims (4)

1. an automobile exhaust system silencer, comprise outlet pipe, it is characterized in that, on described outlet pipe, be arranged with a suppressor case, between described suppressor case and described outlet pipe, be formed with resonant cavity, on the described outlet pipe in described resonant cavity, be also arranged with a sleeve, between described sleeve and described outlet pipe, be formed with a cavity, on described outlet pipe in described cavity, be provided with first kind perforate, on described sleeve, be provided with Equations of The Second Kind perforate;

Wherein, described first kind perforate is positioned at the end of close suction port on described outlet pipe, and described Equations of The Second Kind perforate is positioned at the other end of close described outlet pipe air outlet on described sleeve.

2. automobile exhaust system silencer according to claim 1, is characterized in that, described first kind perforate and Equations of The Second Kind perforate include a plurality of perforates; Described first kind perforate is circumferentially uniform along outlet pipe, and described Equations of The Second Kind perforate is circumferentially uniform along sleeve.

3. automobile exhaust system silencer according to claim 2, is characterized in that, the diameter of described first kind perforate is less than the diameter of Equations of The Second Kind perforate.

4. according to the automobile exhaust system silencer described in claims 1 to 3 any one, it is characterized in that, between described resonant cavity and described sleeve, meet following relation, wherein, f is the CF center frequency that described automobile exhaust system silencer need to abate the noise, the cavity volume that V is resonant cavity, S _cfor the section area of sleeve, l _cfor the length of sleeve, c is the velocity of sound:

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