CN214273767U

CN214273767U - Exhaust pipe and exhaust system

Info

Publication number: CN214273767U
Application number: CN202120378651.XU
Authority: CN
Inventors: 沙欧思麻乃; 平卿; 伯恩·丹尼斯; 巴卡里·凯尔曼
Original assignee: Faurecia Emissions Control Technologies Development Shanghai Co Ltd
Current assignee: Faurecia Emissions Control Technologies Development Shanghai Co Ltd
Priority date: 2021-02-18
Filing date: 2021-02-18
Publication date: 2021-09-24
Anticipated expiration: 2031-02-18

Abstract

The utility model relates to an exhaust duct and exhaust system. The exhaust pipeline comprises a pipe body, and the pipe wall of the pipe body is provided with a silencing hole; the resonant cavity assembly is arranged corresponding to the silencing hole and comprises a resonant cavity shell and a silencing part; the resonance cavity shell is mounted on the outer wall surface of the pipe wall, the resonance cavity shell and the outer wall surface of the pipe wall form a cavity of a closed resonance cavity, and the silencing component is located inside the cavity and covers the silencing hole.

Description

Exhaust pipe and exhaust system

Technical Field

The utility model relates to an exhaust field especially relates to an exhaust duct and exhaust system.

Background

In the exhaust system of a motor vehicle, it is often necessary to reduce the noise of the exhaust system.

One solution in the prior art may be that an exhaust muffler is disposed in an exhaust pipe of an exhaust system, for example, a chinese utility model patent with publication number CN209569049U discloses a muffler structure, and a first exhaust pipe and a second exhaust pipe are provided with muffler holes, and the muffler holes are located in the exhaust muffler and are filled with muffler fibers.

One prior art solution may be that the exhaust Pipe 101 is a Resonance elimination Pipe (Resonance Free Pipe) as shown in fig. 1^TMRFP) that opens a silencing hole 200 in an exhaust duct 101 of an exhaust system, covers a sheet-like microperforated silencing sheet 300 over the silencing hole, and covers a window plate 400 having a window 401 over the porous silencing sheet 300. The beneficial effect who so sets up lies in, can eliminate the long wave through the micro-perforated material, reduces exhaust system and disappears the demand of package to the exhaust for exhaust system lightweight, and owing to reduce the exhaust and disappear the use of package, can be so that exhaust system occupies small, compact structure satisfies exhaust system adaptation narrow and small assembly space's demand.

However, in spite of the above advantages, the use of the resonance elimination tube has a disadvantage in that a part of exhaust gas may leak out of the exhaust duct 101 from the muffling hole 200 due to the provision of the micro-perforated muffling sheet 300 and the window plate 400.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an exhaust duct.

It is another object of the present invention to provide an exhaust system.

The exhaust pipeline comprises a pipe body, wherein the pipe wall of the pipe body is provided with silencing holes; the resonant cavity assembly is arranged corresponding to the silencing hole and comprises a resonant cavity shell and a silencing part; the resonance cavity shell is mounted on the outer wall surface of the pipe wall, the resonance cavity shell and the outer wall surface of the pipe wall form a cavity of a closed resonance cavity, and the silencing component is located inside the cavity and covers the silencing hole.

In one or more embodiments of the exhaust duct, the resonant cavity housing surrounds the duct wall over the entire circumference, and the sound-deadening member includes a sound-deadening housing that forms an enclosed space with the outer wall surface, the sound-deadening housing covering the sound-deadening hole.

In one or more embodiments of the exhaust duct, the resonant cavity housing includes two half shells, which are a first half shell and a second half shell, respectively, two axial ends of the first half shell and the second half shell are tapered sections for connecting with the duct wall, and two circumferential ends of the first half shell and the second half shell are correspondingly connected to form the resonant cavity housing.

In one or more embodiments of the exhaust duct, the sound attenuation housing is formed by punching a boss portion, and an inner wall surface of the boss portion and an outer wall surface of the pipe wall form the closed space.

In one or more embodiments of the exhaust duct, the wall of the exhaust duct is not provided with an exhaust bag.

In one or more embodiments of the exhaust duct, the muffling holes include a first muffling hole located at a first-order resonance position 50% of the length of the pipe body in the length direction, and/or a second muffling hole located at a second-order resonance position 25% and 75% of the length of the pipe body in the length direction, and/or a third muffling hole located at a third-order resonance position 16.65% and 83.35% of the length of the pipe body in the length direction, and/or a fourth muffling hole located at a fourth-order resonance position 62.5% and 87.5% of the length direction.

In one or more embodiments of the exhaust conduit, the position of the muffling aperture has an error of less than 15% from the resonant position.

In one or more embodiments of the exhaust conduit, the volume of the chamber of the resonance chamber is less than 0.5L.

In one or more embodiments of the exhaust conduit, the exhaust conduit is a single conduit or a bifurcated conduit.

An exhaust system according to another aspect of the present invention comprises an exhaust component and the exhaust duct of any one of the above, the exhaust duct connecting the exhaust component.

In one or more embodiments of the exhaust system, the exhaust pipe is a tail pipe of the exhaust system, and the tail pipe is not provided with a rear muffler correspondingly.

The utility model has the advantages of but not limited to following one or combination:

1. the pipe wall of the pipe body is provided with the silencing holes, and the resonant cavity component is arranged corresponding to the silencing holes, so that the noise reduction effect of the exhaust system is basically the same as that of the RFP in the prior art, and the exhaust system has the advantages of compact structure, small occupied size, capability of meeting the requirement of the exhaust system for adapting to narrow assembly space and light weight, and avoids the leakage of exhaust from the silencing holes by the structure of the closed cavity of the resonant cavity, meanwhile, the fluid effects such as local turbulence and the like can not be generated in the pipe body, and the influence on the exhaust back pressure of the exhaust system is small;

2. the arrangement of the silencing hole can solve the problem of whistling (whistling), and ensure the noise reduction effect of the exhaust system;

3. the structure of the resonance cavity shell and the silencing part covering the silencing hole, which surround the pipe wall in the whole circumference, provides a silencing shell with a closed space, so that the volume of the exhaust system occupied by the resonance cavity shell can be further reduced, and the exhaust system can meet the requirements of stricter and narrower assembly space.

Drawings

The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings, it being noted that the drawings are given by way of example only and are not drawn to scale, and should not be taken as limiting the scope of the invention, which is actually claimed, wherein:

fig. 1 is a schematic structural view of a prior art exhaust duct as a resonance elimination duct.

FIG. 2 is an exploded view of an exhaust conduit according to an embodiment.

Fig. 3 is a combined schematic view of the exhaust duct of fig. 2.

FIG. 4 is a schematic diagram of an embodiment of an exhaust conduit as an intermediate pipe in an exhaust system.

Fig. 5A and 5B are schematic structural diagrams of an exhaust pipe in an exhaust system as a tail pipe according to an embodiment.

FIG. 6 is a noise plot of the exhaust conduit, the resonance elimination tube, and the exhaust conduit without the sound attenuating structure of an embodiment.

Some of the reference numbers:

10. 101-exhaust pipe

200. 110-silencing hole

300-micro-perforated silencing sheet

400-Window plate

401-Window

1-tube body

11-pipe wall

111-outer wall surface

2-resonant cavity assembly

21-resonant cavity housing

211-first half shell

212-second half-shell

22-sound damping part

220-noise elimination casing

221-convex part

Detailed Description

The following discloses many different embodiments or examples for implementing the subject technology described. Specific examples of components and arrangements are described below to simplify the present disclosure, but these are merely examples and are not intended to limit the scope of the present invention.

It is to be understood that "one embodiment," "an embodiment," and/or "some embodiments" mean a particular feature, structure, or characteristic described in connection with at least one embodiment of the application. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one or more embodiments" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, some features, structures, or characteristics of one or more embodiments of the present application may be combined as appropriate.

Referring to fig. 2 and 3, in one embodiment, the exhaust duct 10 includes a tube 1 and a resonant cavity assembly 2. The pipe wall 11 of the pipe body 1 is provided with the silencing holes 110, and the arrangement of the silencing holes 110 can effectively solve the problem of whistling (whistling) of the exhaust system, and ensure that the silencing holes 110 of the exhaust system are correspondingly provided with the resonant cavity component 2. The resonant cavity assembly 2 includes a resonant cavity housing 21 and a sound attenuation member 22. As shown in fig. 3, the resonant cavity housing 21 is mounted on the outer wall surface 111 of the tube wall 11, the resonant cavity housing 21 and the outer wall surface 111 of the tube wall 11 form a chamber C of the closed resonant cavity, and the silencing member 22 is located inside the chamber C and covers the silencing hole 110. The beneficial effect of such an arrangement is that the pipe wall of the pipe body is provided with the muffling hole, and the resonant cavity component is arranged corresponding to the muffling hole, as shown in fig. 6, so that the noise reduction effect of the exhaust system adopting the exhaust pipeline 10 is basically the same as that of the RFP in the prior art. Compared with an exhaust pipeline without a silencing structure, the peak value of noise can be reduced. Therefore, the exhaust duct 10 also has the advantages that the RFP does not need to be correspondingly provided with an exhaust muffler, the structure is compact, the occupied size is small, the size can be smaller than 0.5L, the requirement that the exhaust system is suitable for a narrow assembly space is met, and the weight is light, in addition, the structure of the cavity of the closed resonant cavity is adopted, the exhaust in the pipe body 1 is prevented from leaking from the muffler hole 110, meanwhile, the fluid effects such as local turbulence and the like cannot be generated in the pipe body, and the influence on the exhaust back pressure of the exhaust system is small. Reducing the use of exhaust muffling also reduces the material cost of the exhaust system, and also reduces the fiber pollutants (wood emissions) in the exhaust gas with muffling fibers.

The lengths and volumes of the cavity housing 21 and the muffler member 22 are adjusted according to the requirements, such as the frequency of noise reduction and the installation space. The resonance frequency f is related to the equivalent sectional area S of the muffler component 22, the volume V of the cavity C of the resonant cavity, and the length L of the muffler component 22, and the specific relationship is f ═ S/VL; the design value of the resonance frequency f can be obtained by experiment or simulation calculation, and if the volume V of the chamber C is determined due to restrictions such as an installation space, the equivalent sectional area S and the length L of the muffler component 22 are adjusted so that the resonance frequency f satisfies the requirement of the design value.

Referring to fig. 4 and fig. 5A and 5B, in an exhaust system 100 including an exhaust pipe 10 and an exhaust component 20, as shown in fig. 4, in an embodiment, the exhaust pipe 10 may be an intermediate pipe between the two exhaust components 20, or as shown in fig. 5A and 5B, and in another embodiment, the exhaust pipe 10 is a tail pipe of the exhaust system. The specific structure of the exhaust duct 10 may be a single pipe structure as shown in fig. 4 and 5B, or a bifurcated pipe structure as shown in fig. 5A. As shown in fig. 5A and 5B, in the structure of the tail pipe, the sound-deadening holes 110 and the exhaust pipe 10 of the resonant cavity assembly 2 are adopted, so that a rear muffler structure does not need to be formed on the tail pipe, and the rear muffler structure can refer to the chinese utility model patent with publication number CN209569049U, entitled "rear muffler and exhaust system of internal combustion engine", and will not be described herein again.

With continued reference to fig. 4 and fig. 5A and 5B, the positions of the muffling holes 110 and the correspondingly arranged resonant cavity assemblies 2 in the length direction of the pipe body 1 can be a first muffling hole and a first resonant cavity assembly 201 at a first-order resonance position of 50% of the length of the pipe body 1, and/or a second muffling hole and a second resonant cavity assembly 202 at a second-order resonance position of 25% and 75% of the length of the pipe body, and/or a third muffling hole and a third resonant cavity assembly 203 at a third-order resonance position of 16.65% and 83.35% of the length of the pipe body, and/or a fourth muffling hole and a fourth resonant cavity assembly at a fourth-order resonance position of 62.5% and 87.5% of the length of the pipe body. Due to the constraints of installation space, in some cases, the silencing holes and the corresponding resonant cavity components cannot be strictly arranged at the above longitudinal positions, and the allowable position error is about 15%. Assuming, for example, that the length of the pipe body 1 is 2m, it is desirable to provide the first muffling hole and the corresponding first resonant cavity assembly at the first-order resonant position of the 1m position, but due to the installation space limitation, for example, if the resonant cavity assembly is provided at the 1m position, it is possible to select the position of the muffling hole and the resonant cavity assembly within a 15% error range, for example, a length range of 0.85m to 1.15m, which can meet the requirement of the installation space, and the inventor has found that the requirement of the noise performance of the exhaust system can be substantially met. It can be understood that the number of the muffling holes and the resonant cavity assembly can be adjusted according to actual needs, but the inventor finds that the effect of disposing the muffling holes is that the first muffling hole > the second muffling hole > the third muffling hole > the fourth muffling hole, that is, if the first muffling hole and the resonant cavity assembly can already meet the noise reduction requirement, the second muffling hole does not need to be disposed, and as for the third muffling hole and the fourth muffling hole, and so on, detailed description is omitted here.

With continued reference to fig. 2 and 3, in some embodiments, the resonant cavity housing 21 surrounds the pipe wall 11 completely, the sound-attenuating member 22 includes a sound-attenuating housing 220, the sound-attenuating housing 220 forms a closed space S with the outer wall 111, and the sound-attenuating housing 220 covers the sound-attenuating hole 110. The advantage thus obtained is that the exhaust duct 10 can be made to meet more stringent installation space requirements. As mentioned above, the volume occupied by the resonant cavity assembly is less than 0.5L, and the structure surrounding the entire circumference is adopted, so that the height of the resonant cavity housing 21 with the same volume can be further reduced, the resonant cavity housing 21 is prevented from interfering with other parts of the automobile, and the requirement of stricter installation space is met. With continued reference to fig. 2 and fig. 3, in one or more embodiments, the specific structure of the resonant cavity housing 21 may be that the resonant cavity housing 21 includes two half shells, which are a first half shell 211 and a second half shell 212, two axial ends of the first half shell 211 and the second half shell 212 are respectively a necking section 214 for connecting with the pipe wall 111, and two circumferential ends 215 of the first half shell 211 and the second half shell 212 are correspondingly connected to form the resonant cavity housing 21. The beneficial effect of the arrangement is that the resonant cavity shell 21 is easy to process and the fixed connection with the pipe wall 11 is reliable. With continued reference to fig. 2 and 3, in some embodiments, the specific structure of the sound-damping housing 220 may be that a protruding portion 221 is formed by stamping, and the inner wall surface of the protruding portion 221 and the outer wall surface 111 of the pipe wall 11 form a closed space S, so that the sound-damping housing 220 has the advantages of low processing cost, reliable connection with the outer wall surface 111, and strip-shaped structure of the sound-damping housing 220, and the protruding portion 221 is stamped in strip-shaped structure, and occupies a small height, and is particularly suitable for the installation of the resonant cavity housing 21 in order to adapt to the installation space with limited height.

As can be seen from the above, the beneficial effects of the exhaust duct and the exhaust system described in the above embodiments include, but are not limited to:

Although the present invention has been described with reference to the above embodiments, it is not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention, all without departing from the content of the technical solution of the present invention, fall within the scope of protection defined by the claims of the present invention.

Claims

1. An exhaust duct, comprising:

the pipe wall of the pipe body is provided with a silencing hole; and

the resonant cavity assembly is arranged corresponding to the silencing hole and comprises a resonant cavity shell and a silencing part;

the resonance cavity shell is mounted on the outer wall surface of the pipe wall, the resonance cavity shell and the outer wall surface of the pipe wall form a cavity of a closed resonance cavity, and the silencing component is located inside the cavity and covers the silencing hole.

2. The exhaust pipe of claim 1 wherein said resonator housing circumferentially surrounds said pipe wall, said muffler assembly comprising a muffler shell, said muffler shell defining an enclosed space with said outer wall, said muffler shell covering said muffler opening.

3. The exhaust duct according to claim 2, wherein the resonant cavity housing comprises two half shells, namely a first half shell and a second half shell, axial two ends of the first half shell and the second half shell are respectively provided with a necking section for connecting with the duct wall, and circumferential two ends of the first half shell and the second half shell are correspondingly connected to form the resonant cavity housing.

4. An exhaust pipe according to claim 3, wherein said muffler case includes a boss portion formed by punching, and an inner wall surface of said boss portion and an outer wall surface of said pipe wall constitute said closed space.

5. The exhaust duct of claim 1, wherein the wall of the exhaust duct is free of a corresponding exhaust muffler.

6. An exhaust conduit according to claim 1, wherein the muffling apertures comprise a first muffling aperture located at a first order resonance position 50% of the length of the pipe body in the length direction, and/or a second muffling aperture located at a second order resonance position 25%, 75% of the length of the pipe body in the length direction, and/or a third muffling aperture located at a third order resonance position 16.65%, 83.35% of the length of the pipe body in the length direction, and/or a fourth muffling aperture located at a fourth order resonance position 62.5%, 87.5% of the length direction.

7. An exhaust conduit according to claim 6, wherein the position of said muffling aperture has an error of less than 15% from said resonant position.

8. An exhaust conduit according to claim 1, wherein the chamber of the resonance chamber has a volume of less than 0.5L.

9. The exhaust conduit according to claim 1, wherein the exhaust conduit is a single conduit or a bifurcated conduit.

10. An exhaust system comprising an exhaust component and an exhaust conduit according to any of claims 1 to 9, said exhaust conduit being connected to said exhaust component.

11. The exhaust system of claim 10, wherein the exhaust conduit is a tailpipe of the exhaust system that allows no post-muffler to be provided.