CN214273768U

CN214273768U - Exhaust pipe and exhaust system

Info

Publication number: CN214273768U
Application number: CN202120378901.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 pipe; 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, the silencing pipe is located inside the cavity, and the silencing pipe is led out from the pipe body from one end of the silencing pipe and extends in the cavity.

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.

According to the utility model discloses an aspect's an exhaust duct, include: 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 pipe; 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, the silencing pipe is located inside the cavity, and the silencing pipe is led out from the pipe body from one end of the silencing pipe and extends in the cavity.

In one or more embodiments of the exhaust duct, one end of the muffler pipe has a step extending radially outward from the muffler pipe, one end of the muffler pipe is located inside the pipe body, and the step is connected to the outer wall surface.

In one or more embodiments of the exhaust duct, the muffling pipe is a bent pipe including a first section extending from the muffling hole in a radial direction of the pipe body and a second section bent from the first section and extending in a length direction of the pipe body.

In one or more embodiments of the exhaust duct, the resonant cavity housing is a cover member formed by stamping, an inner wall surface of the cover member and an outer wall surface of the duct wall form a chamber of the closed resonant cavity, and an axial end of the cover member is fixedly connected to a part of a circumference of the outer wall surface.

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 duct, the position of the muffling aperture has an error of less than 15% from a prescribed lengthwise 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 tailpipe of the exhaust system that allows no back muffler to be provided 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, avoids exhaust leakage from the silencing holes by the structure of the cavity of the closed resonant cavity, does not generate fluid effects such as local turbulence and the like on the pipe body, and has small influence on the exhaust back pressure of the exhaust system;

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

3. the muffler pipe structure is adopted for muffling, the requirements of different muffling frequencies can be flexibly met only through the change of the pipe length, and the exhaust pipeline is good in universality and low in processing cost.

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

210-cover part

22-muffler pipe

222-step

2201 first stage

2202-second stage

20-exhaust 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 muffler pipe 22. As shown in fig. 3, the resonant cavity housing 21 is mounted on the outer wall surface 111 of the tube wall 11, and the resonant cavity housing 21 and the outer wall surface 111 of the tube wall 11 form a closed resonant cavity chamber C. The muffler pipe 22 is located inside the chamber C, and one end of the muffler pipe 22 is led out from the pipe body 1 and extends inside the chamber C. Structural parameters such as sectional areas, extension lengths, and extension heights of the resonant cavity housing 21 and the muffler pipe 22 can be adjusted according to requirements and restrictions on noise reduction frequencies, installation spaces, and the like. The resonance frequency f is related to the equivalent sectional area S of the muffling tube 22, the volume V of the chamber C of the resonant cavity and the length L of the muffling member 22, and the specific relationship is f ═ S/VL; the design value of the resonance frequency f can be obtained through experiment or simulation calculation, and if the volume V of the chamber C is determined due to limitations such as installation space, the equivalent sectional area S of the muffler pipe 22 (i.e., the pipe diameter of the muffler pipe) and the extension length L of the muffler pipe 22 are adjusted, so that the resonance frequency f meets the requirement of the design value.

The beneficial effect of such an arrangement is that 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, 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 pipeline 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, 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 holes 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. Meanwhile, the silencing pipe 22 is adopted, the requirements of adapting to different silencing frequencies can be met only by intercepting the pipe fittings with different extension lengths, and the structure is good in universality and low in processing cost. For example, if the exhaust pipe 10 required for different muffling frequencies needs to be manufactured, only a batch of muffling pipes 22 with fixed lengths and pipe diameters need to be processed, and the muffling pipes 22 are cut according to the different muffling frequencies, so that the processing cost of the exhaust pipe 10 is reduced.

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 exhaust pipe 10 with the muffling hole 110 and the resonant cavity assembly 2 is adopted, so that a preferable muffling effect can be obtained, and therefore, 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 internal combustion engine exhaust system", and is not repeated herein.

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, one end of the muffler pipe 22 has a step 222 extending radially outward from the muffler pipe 22, one end of the muffler pipe 22 extends into the pipe body 1, and the step 222 abuts against the outer wall surface 111, so that the beneficial effects of making the structure of the muffler pipe 22 mounted on the pipe body 1 more stable and also limiting the length of the muffler pipe 22 extending into the pipe body 1 are obtained. The muffling tube 22 can be a bent tube, and includes a first section 2201 and a second section 2202, wherein the first section 2201 extends from the muffling hole 110 along the radial direction of the tube body 1, and the second section 2202 is bent from the first section 2201 and extends along the length direction of the tube body 1, so that the height space occupied by the muffling tube 22 can be reduced, the height space occupied by the resonant cavity assembly can be reduced, the resonant cavity assembly can be prevented from interfering with other components, and the adaptability to different installation spaces can be further improved.

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 is a cover member 210 formed by stamping, an inner wall surface of the cover member 210 and an outer wall surface 111 of the tube wall 11 form a cavity C of the enclosed resonant cavity, and an axial end of the cover member 210 is fixedly connected to a partial circumference of the outer wall surface 111. The beneficial effects of this way lie in that, the lid piece 210 can adopt the punching press one shot forming, and with the simple connection technology of body 1 for exhaust duct 10 is whole easily to be processed.

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:

3. the silencing pipe structure is adopted for silencing, the requirements of different silencing frequencies can be flexibly met only through the change of the length of the pipe, and the universality of the exhaust pipeline is good.

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 pipe;

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, the silencing pipe is located inside the cavity, and the silencing pipe is led out from the pipe body from one end of the silencing pipe and extends in the cavity.

2. An exhaust conduit according to claim 1, wherein an end of said muffler pipe has a step extending radially outwardly therefrom, said muffler pipe having an end located within said pipe body, said step being connected to said outer wall surface.

3. The exhaust duct of claim 2, wherein the muffling tube is a bent tube including a first section extending from the muffling aperture in a radial direction of the tube and a second section bent from the first section and extending in a length direction of the tube.

4. An exhaust conduit according to claim 3, wherein the resonator housing is a cover member formed by stamping, an inner wall surface of the cover member and an outer wall surface of the pipe wall forming a chamber of the enclosed resonator, an axial end of the cover member being fixedly connected to a portion of a circumference of the outer wall surface.

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 duct according to claim 6, wherein the position of the muffling aperture has an error of less than 15% from the prescribed lengthwise 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.