CN212106020U

CN212106020U - Muffler and exhaust system

Info

Publication number: CN212106020U
Application number: CN202020926347.XU
Authority: CN
Inventors: 丹尼斯·博纳; 季辰吉
Original assignee: Faurecia Emissions Control Technologies Development Shanghai Co Ltd
Current assignee: Faurecia Emissions Control Technologies Development Shanghai Co Ltd
Priority date: 2020-05-27
Filing date: 2020-05-27
Publication date: 2020-12-08
Anticipated expiration: 2030-05-27

Abstract

The utility model relates to a silencer and exhaust system. The silencer comprises an air inlet pipe, wherein the air inlet pipe is provided with an air inlet pipe inlet section, an air outlet section and an air inlet pipe body positioned between the air inlet pipe inlet section and the air outlet section, the air inlet pipe body is provided with a plurality of silencing holes, and the air outlet section of the air inlet pipe is provided with a first necking part with a gradually-reduced pipe diameter in the direction pointing to the air outlet section at the air inlet section of the air inlet pipe; the air outlet pipe is provided with an air inlet section of the air outlet pipe, an air outlet section of the air outlet pipe and an air outlet pipe body positioned between the air inlet section and the air outlet section of the air outlet pipe; and the shell is internally limited with a first space, and the air inlet pipe and the air outlet pipe are positioned in the first space.

Description

Muffler and exhaust system

Technical Field

The utility model relates to an acoustics field especially relates to a silencer and exhaust system.

Background

In a muffler of an exhaust system of an automobile, for example, a muffler described in chinese utility model patent document having an authority publication number of CN209569049U and a name of "rear muffler and exhaust system of an internal combustion engine", muffling is performed by arranging muffling holes and muffling fibers around an intake pipe and an outlet pipe, and a plurality of partition plates are provided in the muffler to support the intake pipe and the outlet pipe.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a silencer.

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

According to the utility model discloses a silencer for exhaust system, including the intake pipe, the intake pipe has intake pipe inlet section, intake pipe section of giving vent to anger and is located the intake pipe shaft between the two, the intake pipe shaft has a plurality of silencing holes, the intake pipe section of giving vent to anger has the first throat portion of the direction pipe diameter convergent that points to the section of giving vent to anger at intake pipe inlet section; the air outlet pipe is provided with an air inlet section of the air outlet pipe, an air outlet section of the air outlet pipe and an air outlet pipe body positioned between the air inlet section and the air outlet section of the air outlet pipe; and the shell is internally limited with a first space, and the air inlet pipe and the air outlet pipe are positioned in the first space.

In one or more embodiments of the muffler, an inlet port of the outlet pipe inlet section is larger than an area of an outlet port of the inlet pipe outlet section, and the outlet pipe inlet section has a first flared portion with a gradually flared pipe diameter in a direction from the outlet pipe outlet section to the outlet pipe inlet section.

In one or more embodiments of the muffler, the inlet pipe and the outlet pipe are coaxially arranged, and a first axial distance is provided between an outlet port of the inlet pipe and an inlet port of the outlet pipe.

In one or more embodiments of the muffler, the first axial distance is 3mm to 15 mm.

In one or more embodiments of the muffler, the housing includes a first cylinder and a second cylinder, and the first cylinder and the second cylinder are respectively located at two axial ends of the housing and are respectively and fixedly connected to the air inlet section of the air inlet pipe and the air outlet section of the air outlet pipe; a third cylinder; the outer diameter of the third cylinder is larger than that of the first cylinder and that of the second cylinder; the first conical surface section is connected with the first cylinder at one axial end of the first conical surface section, and the other axial end of the first conical surface section is connected with the third cylinder; the second conical surface section is connected with the third cylinder at one axial end of the second conical surface section, and the other axial end of the second conical surface section is connected with the second cylinder.

In one or more embodiments of the muffler, the first cylinder and the first conical surface section, and the second cylinder and the second conical surface section are formed by a spinning process, and the third cylinder is formed by flat plate winding and welding.

In one or more embodiments of the muffler, the inlet section of the inlet pipe and the first cylinder form a first cantilever structure, and the outlet section of the outlet pipe and the second cylinder form a second cantilever structure.

In one or more embodiments of the muffler, the air outlet section of the intake pipe has a first choke portion and a straight portion that are axially connected, an axial end of the first choke portion is connected to the intake pipe body, an axial other end of the first choke portion is connected to an axial end of the straight portion, and an axial other end of the straight portion has an air outlet port of the air outlet section of the intake pipe.

In one or more embodiments of the muffler, the plurality of muffling holes are arranged along an axial direction of the intake pipe body; the air inlet pipe and the space between the air outlet pipe and the shell are not filled with silencing fibers.

According to another aspect of the present invention, there is provided an exhaust system comprising a muffler as defined in any one of the above, wherein exhaust gas is introduced into the muffler through the intake pipe, and is discharged through the outlet pipe to the muffler.

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

1. through the synergistic effect of the muffling hole of the air inlet pipe of the muffler and the first necking part, the design of the first necking part increases the back pressure, and when the exhaust of the internal combustion engine is low in flow, most of gas is directly exhausted through the air inlet pipe, so that the performance of processing low-frequency noise is improved; when the exhaust of the internal combustion engine is large in flow, the back pressure of the exhaust gas from the air inlet pipe is increased by the structure of the first necking part, so that part of the exhaust gas flows out of the silencing holes, the upstream turbulence is dissipated, the gas flow speed is reduced, and the temperature is reduced by the expansion of the gas. By integrating three points, the upstream turbulence of the area can be improved, the level of downstream regeneration turbulence can be reduced, the howling risk caused by a bale breaking cavity mode is effectively reduced, the performance of processing high-frequency noise is ensured, and the exhaust system meets the noise requirement.

2. Through the arrangement of the first cylinder, the second cylinder and the conical surface section, the support rigidity of the shell to the air inlet pipe and the air outlet pipe is improved, so that the air inlet pipe and the air outlet pipe are stable in position in the operation process, the radiation noise is reduced, and the exhaust system meets the noise requirement.

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. 1A and 1B are external structural views of a muffler according to an embodiment.

Fig. 2 is a sectional view along the line a-a according to fig. 1A.

Fig. 3 is a partial enlargement at B according to fig. 2.

Fig. 4 is a partial enlargement at C according to fig. 2.

Fig. 5 is a side view according to fig. 2.

Some of the reference numbers:

10-silencer

1-inlet pipe

11-inlet pipe inlet section

12-air inlet pipe air outlet section

121-first throat section

122-outlet port

123-straight part

13-air inlet pipe body

131-anechoic hole

2-air outlet pipe

21-inlet section of air outlet pipe

211-inlet port

212-first flared section

22-outlet pipe outlet section

23-air outlet pipe body

3-shell

31-first cylinder

32-second cylinder

33-third cylinder

34-first taper

35-second conical surface

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.

In addition, the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and if not stated otherwise, the terms do not have special meanings, and therefore, the scope of the present invention should not be construed as being limited. Reference throughout this specification to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic described in connection with at least one embodiment of the present application is included in at least one embodiment of the present 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. 1A, 1B and 2, in an embodiment, a muffler 10 of an exhaust system includes an inlet pipe 1, an outlet pipe 2 and a housing 3. The air inlet pipe 1 is provided with an air inlet pipe air inlet section 11, an air outlet pipe section 12 and an air inlet pipe body 13 located between the air inlet pipe section 11 and the air outlet pipe section 12, the air inlet pipe body 13 is provided with a plurality of silencing holes 131, the silencing holes 131 are generally distributed along the axial direction of the air inlet pipe 1, the occupied axial length of the silencing holes should not exceed a first length, abnormal sound (abnormal noise) can be caused when the axial length of the silencing holes exceeds the first length, and specific values of the first length can be obtained through acoustic simulation or experiments. The specific number of the silencing holes 131 is determined by actual conditions such as silencing and noise reduction requirements, and is not limited to the number shown in the figure. The inlet pipe outlet section 12 has a first throat portion 121 with a tapered pipe diameter in a direction in which the inlet pipe inlet section 11 points to the inlet pipe outlet section 12. The outlet pipe 2 has an outlet pipe inlet section 21, an outlet pipe outlet section 22 and an outlet pipe body 23 therebetween. A first space 100 is defined in the housing 3, and the inlet pipe 1 and the outlet pipe 2 are fixedly installed in the first space 100. In the exhaust system, exhaust gas enters the muffler 10 from the inlet pipe 1 of the muffler 10, and is discharged from the outlet pipe 2 of the muffler 10. The arrangement has the advantages that the arrangement of the first necking part 121 increases the back pressure through the cooperation of the muffling hole 131 of the air inlet pipe 1 of the muffler 10 and the first necking part 121; when the exhaust gas has small flow, most of the gas is directly exhausted through the gas inlet pipe 1, so that the performance of processing low-frequency noise is improved; when the exhaust gas is large in flow, the structure of the first choke 121 increases the back pressure of the gas outlet section 12 of the gas inlet pipe, so that part of the exhaust gas is forced to flow out of the silencing holes 131, the upstream turbulence is dissipated, the gas flow speed is reduced, and the temperature is reduced due to the expansion of the gas. The three points are integrated, the upstream turbulence of the area can be improved, the level of downstream regeneration turbulence can be reduced, the risk of whistling (whistling) caused by a muffler cavity mode is effectively reduced, the performance of processing high-frequency noise is ensured, and the exhaust system can meet the noise requirement.

With continued reference to fig. 2, in some embodiments, the specific structure of the outlet pipe 2 may be that the inlet port 211 of the outlet pipe inlet section 21 is larger than the area of the outlet port 122 of the inlet pipe outlet section 12, and the inlet section 21 of the outlet pipe 2 has a first flared portion 212 with a gradually flared pipe diameter in the direction of the outlet pipe outlet section 22 pointing to the outlet pipe inlet section 21. The beneficial effect that so sets up lies in, can suitably reduce the backpressure, prevents that the backpressure is too big, also can prevent the gaseous vortex, further reduces the risk that causes squeaking. In addition, as shown in fig. 2, in some embodiments, the specific position of the first choke 121 may be that the air outlet section 12 of the air inlet pipe has a first choke 121 and a straight portion 123 that are axially connected, one axial end of the first choke 122 is connected to the air inlet pipe body 13, the other axial end of the first choke 122 is connected to one axial end of the straight portion 123, the other axial end of the straight portion 123 has an air outlet port 122 of the air outlet section 12 of the air inlet pipe, and the arrangement of the straight portion 123 may also prevent gas from disturbing flow and reduce the risk of squeal.

With continued reference to fig. 2, in an embodiment, the specific structure of the inlet pipe 1 and the outlet pipe 2 may be that both are straight pipe forms, and are coaxially installed, and a first axial distance G1 is provided between the outlet port 122 of the inlet pipe 1 and the inlet port 211 of the outlet pipe 2, and the size of the first axial distance G1 is determined by the adaptive exhaust system and the noise reduction requirement, generally between 3mm and 15mm, and too small a first axial distance may cause interference, and too large a first axial distance may cause too large back pressure.

With continued reference to fig. 2, with the structure of the intake pipe 1 of the above embodiment, it is possible to reduce the filling amount of the silencing fibers in the spaces between the intake pipe 1 and the outlet pipe 2 and the housing 3, thus reducing the material cost of the muffler 10, and also reducing the fiber pollutants (wood emissions) mixed in the exhaust gas by the silencing fibers. Even, as shown in fig. 2, the filling of the silencing fibers is not needed, so that the step of filling the silencing fibers in the manufacturing process of the silencer 10 can be omitted, the manufacturing cost of the silencer 10 is reduced, the condition that the silencer 10 is unqualified due to wrong filling in the process of filling the silencing fibers is avoided, and the processing yield of the silencer 10 is improved.

With continued reference to fig. 1A, 1B, and 2, in one or more embodiments, the specific structure of the housing 3 may include a first cylinder 31, a second cylinder 32, a third cylinder 33, a first tapered section 34, and a second tapered section 35. The first cylinder 31 and the second cylinder 32 are respectively located at two axial ends of the housing 3 and are respectively fixedly connected with the air inlet section 11 of the air inlet pipe 1 and the air outlet section 22 of the air outlet pipe 2. The outer diameter of the third cylinder 33 is larger than the outer diameters of the first cylinder 31 and the second cylinder 32; the first tapered section 34 is connected to the first cylinder 31 at one axial end thereof, and the third cylinder 33 at the other axial end thereof, and the second tapered section 35 is connected to the third cylinder 33 at one axial end thereof, and the second cylinder 32 at the other axial end thereof. The beneficial effect of such setting lies in, has improved the support rigidity to intake pipe 1, outlet duct 2 respectively at the axial both ends of object, reduces the radiation noise. The concrete fixing structure of the first cylinder 31 and the air inlet pipe 1, for example, referring to fig. 3, may be a first welding position 110 where the air inlet pipe 1 slightly exceeds the length of the first cylinder 31, and is welded to the first cylinder 31; for a specific fixing structure of the second cylinder 32 and the air outlet tube 2, referring to fig. 4 as an example, a portion of the air outlet tube 2 slightly exceeding the length of the second cylinder 32 may be a second welding position 210, and is welded to the second cylinder 32.

Referring to fig. 2 to 5, in some embodiments, the first cylinder 31 and the first conical section 34, and the second cylinder 32 and the second conical section 35 are formed by a spinning process, that is, the first cylinder 31 and the first conical section 34 are integrally formed by spinning, and the second cylinder 32 and the second conical section 35 are integrally formed by spinning. The specific process may be that a flat plate is wound to be welded into the shape of the third cylinder 33, and as shown in the figure, a stable and reliable cylinder structure is formed at the welding position 5 by welding; spinning is carried out at two axial ends, a first cylinder 31 and a first conical surface section 34 are obtained at one axial end, and a second cylinder 32 and a second conical surface section 35 are obtained at the other axial end. The spinning process can be realized by a numerical control machine tool or a manual machine tool, and the specific operation of the spinning process is well known to those skilled in the art and is not described herein again. The spinning process has the beneficial effects that due to the characteristics of the spinning process, crystal grains of the conical surface can be changed during spinning so as to obtain higher strength, and the supporting rigidity of the air inlet pipe 1 and the air outlet pipe 2 is further increased. In addition, because the shell 3 is formed by winding and welding the flat plate piece, the supporting rigidity is also increased compared with the locking process.

With reference to fig. 2, with the structure of the above embodiment, the air inlet pipe 1 and the air outlet pipe 2 have sufficient support rigidity, so that the number of partition plates arranged in the first space 100 can be reduced, even as shown in fig. 2, the partition plates are not required to be arranged in the first space, the air inlet pipe section 11 and the first cylinder 31 form a first cantilever structure with one end supported, and the air outlet pipe section 22 and the second cylinder 32 form a second cantilever structure with one end supported, so that the material cost of the muffler 10 is further reduced, the weight of the muffler 10 is also reduced, and the reduction of the weight of the muffler 10 and the exhaust system is facilitated.

As can be seen from the above, the advantages of the muffler 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. A muffler for an exhaust system, comprising

The air inlet pipe is provided with an air inlet pipe inlet section, an air outlet section and an air inlet pipe body positioned between the air inlet pipe inlet section and the air outlet section, the air inlet pipe body is provided with a plurality of silencing holes, and the air outlet section of the air inlet pipe is provided with a first necking part with a gradually reduced pipe diameter in a direction pointing to the air outlet section at the air inlet section of the air inlet pipe;

the air outlet pipe is provided with an air inlet section of the air outlet pipe, an air outlet section of the air outlet pipe and an air outlet pipe body positioned between the air inlet section and the air outlet section of the air outlet pipe; and

the air inlet pipe and the air outlet pipe are located in the first space.

2. The muffler of claim 1, wherein an inlet port of the inlet section of the outlet pipe is larger than an area of an outlet port of the outlet section of the inlet pipe, and the inlet section of the outlet pipe has a first flared portion with a gradually flared diameter in a direction from the outlet section of the outlet pipe toward the inlet section of the outlet pipe.

3. The muffler of claim 1, wherein the inlet pipe is coaxial with the outlet pipe, and wherein a first axial distance is provided between the outlet port of the inlet pipe and the inlet port of the outlet pipe.

4. The muffler of claim 3, wherein the first axial distance is 3mm-15 mm.

5. The muffler of claim 1, wherein the housing comprises:

the first cylinder and the second cylinder are respectively positioned at two axial ends of the shell and are respectively fixedly connected with the air inlet section of the air inlet pipe and the air outlet section of the air outlet pipe;

a third cylinder; the outer diameter of the third cylinder is larger than that of the first cylinder and that of the second cylinder;

and

the first conical surface section is connected with the first cylinder at one axial end of the first conical surface section, and the other axial end of the first conical surface section is connected with the third cylinder; the second conical surface section is connected with the third cylinder at one axial end of the second conical surface section, and the other axial end of the second conical surface section is connected with the second cylinder.

6. The muffler of claim 5, wherein the first barrel and the first cone section, and the second barrel and the second cone section are formed by a spinning process.

7. The muffler of claim 5 or 6, wherein the inlet section of the inlet pipe and the first cylinder form a first cantilever structure, and the outlet section of the outlet pipe and the second cylinder form a second cantilever structure.

8. The muffler of claim 1, wherein the inlet pipe outlet section has a first throat portion and a flat portion that are axially connected, an axial one end of the first throat portion being connected to the inlet pipe body, an axial other end of the first throat portion being connected to an axial one end of the flat portion, and an axial other end of the flat portion having an outlet port of the inlet pipe outlet section.

9. The muffler of claim 1, wherein the plurality of muffling apertures are disposed along an axial direction of the intake pipe body; the air inlet pipe and the space between the air outlet pipe and the shell are not filled with silencing fibers.

10. An exhaust system comprising a muffler as claimed in any one of claims 1 to 9, exhaust gas entering the muffler from the inlet pipe and exiting the muffler from the outlet pipe.