CN115324686A

CN115324686A - Silencer used in vehicle exhaust system and vehicle

Info

Publication number: CN115324686A
Application number: CN202210885936.1A
Authority: CN
Inventors: 邓航; 陆楠; 刘湃; 郑晨
Original assignee: SAIC General Motors Corp Ltd; Pan Asia Technical Automotive Center Co Ltd
Current assignee: SAIC General Motors Corp Ltd; Pan Asia Technical Automotive Center Co Ltd
Priority date: 2022-07-26
Filing date: 2022-07-26
Publication date: 2022-11-11

Abstract

The invention discloses a silencer and a vehicle, comprising a first silencing pipe, a second silencing pipe and a silencer shell; the silencer shell comprises an outer-layer cylinder body and an inner-layer cylinder body, wherein two ends of the outer-layer cylinder body are sealed by end covers, two baffle plates are arranged inside the inner-layer cylinder body at intervals, and a plurality of baffle plate vent holes are formed in the two baffle plates respectively; an annular cavity is formed between the inner-layer cylinder and the outer-layer cylinder; the two baffles divide the cavity of the inner-layer cylinder into a first cavity, a second cavity and a third cavity in sequence; and a plurality of micropores arranged in a matrix manner are arranged on the wall of the inner barrel body in the third chamber, and each micropore is communicated with the annular cavity and the third chamber. The invention discloses a silencer and a vehicle, which do not need to fill silencing cotton in an inner layer cylinder body, save cost, play a role in silencing by prolonging a gas circulation path, and improve the silencing effect by the arrangement mode of a matrix microporous structure and an annular cavity.

Description

Silencer used in vehicle exhaust system and vehicle

Technical Field

The invention relates to the technical field of automobile exhaust silencing, in particular to a silencer used in an automobile exhaust system and an automobile.

Background

Mufflers are widely used muffling devices in the exhaust system of internal combustion engines. Muffler types are generally classified into reactive mufflers, resistive mufflers, and composite mufflers. At present, the silencer basically adopts a composite structure, the structure combines a resistance silencer and a reactive silencer together, and the silencer has good silencing effect from low frequency, medium frequency to high frequency. The existing silencer generally adopts the mode that silencing cotton is directly filled in an airflow circulation cavity of the silencer, and airflow can be adsorbed and silenced when passing through the silencing cotton. The volume of the airflow circulation cavity is larger, more silencing cotton is needed, and the filling of the silencing cotton also has certain influence on the circulation of the air.

In view of the above, it is necessary to provide a new muffler for use in a vehicle exhaust system and a vehicle.

Disclosure of Invention

The invention aims to provide a novel silencer used in a vehicle exhaust system and a vehicle.

The technical scheme of the invention provides a silencer used in a vehicle exhaust system, which comprises a first silencing pipe, a second silencing pipe and a silencer shell;

the silencer shell comprises an outer-layer cylinder body and an inner-layer cylinder body, wherein two ends of the outer-layer cylinder body are sealed by end covers, two baffle plates are arranged inside the inner-layer cylinder body at intervals, and a plurality of baffle plate vent holes are formed in the two baffle plates respectively;

two ends of the inner-layer cylinder are respectively connected with the end covers, and an annular cavity is formed between the inner-layer cylinder and the outer-layer cylinder;

the two baffles divide the cavity of the inner-layer cylinder into a first cavity, a second cavity and a third cavity in sequence;

the first silencing pipe penetrates through one end cover and one baffle plate, the second silencing pipe penetrates through the other baffle plate and the other end cover, the exhaust end of the first silencing pipe is positioned in the second cavity, and the air inlet end of the second silencing pipe is positioned in the second cavity;

and a plurality of micropores arranged in a matrix manner are arranged on the wall of the inner barrel body in the third chamber, and each micropore is communicated with the annular cavity and the third chamber.

In an optional technical solution, a plurality of the micropores arranged in a matrix are also arranged on the cylinder wall of the inner cylinder body in the first chamber, and each micropore communicates the annular cavity and the first chamber.

In one optional technical scheme, in the radial direction of the inner layer cylinder, the air inlet end of the second silencing pipe is offset to one side of the air outlet end of the first silencing pipe;

in the axial direction along the inner barrel, the air inlet ends of the second silencing pipes and the air outlet ends of the first silencing pipes are arranged in a staggered mode, the air inlet ends of the second silencing pipes extend to a position between the air outlet end of the first silencing pipe and one baffle, and the air outlet ends of the first silencing pipes extend to a position between the air inlet end of the second silencing pipe and the other baffle.

In one optional technical scheme, the inner-layer cylinder and the outer-layer cylinder are coaxially arranged, and the first silencing pipe and the inner-layer cylinder are coaxially arranged.

In one optional technical scheme, the annular cavity is filled with sound attenuation cotton.

In one optional technical scheme, the silencing cotton is bonded to the inner surface of the outer-layer cylinder body, and a preset distance is reserved between the silencing cotton and the inner-layer cylinder body.

In an optional technical solution, the first silencing pipe and the second silencing pipe are respectively in interference fit with the corresponding end cover and the corresponding baffle.

In an alternative embodiment, the diameter of the micro-holes is smaller than 1mm, and the diameter of the vent holes of the baffle is larger than 1mm.

In one optional technical scheme, the outer-layer cylinder body and the inner-layer cylinder body are respectively formed by rolling a stainless steel plate, and the end cover and the baffle are respectively formed by punching and molding a stainless steel plate.

The technical scheme of the invention also provides a vehicle which comprises the silencer used in the exhaust system of the vehicle.

By adopting the technical scheme, the method has the following beneficial effects:

according to the silencer used in the vehicle exhaust system, gas enters the second chamber through the first silencing pipe, a part of gas enters the third chamber and the first chamber through the baffle vent holes, the gas entering the third chamber enters the annular cavity between the inner-layer barrel and the outer-layer barrel through the plurality of micropores arranged in a matrix manner, the gas returns to the second chamber, and the gas in the second chamber is exhausted through the second silencing pipe, so that the gas flow path is prolonged, energy is consumed, and the silencing effect is achieved.

The annular cavity forms a resonance sound absorption structure cavity with low sound quality and high impedance between the inner layer cylinder body and the outer layer cylinder body, when sound waves pass through the micropores, the sound energy is attenuated due to energy consumption caused by friction, a wider sound absorption frequency band can be covered, and the noise reduction effect is improved.

In summary, the silencer and the vehicle for the vehicle exhaust system provided by the invention have the advantages that the silencing cotton does not need to be filled in the inner-layer cylinder, the cost is saved, the silencing cotton does not block airflow, smooth gas circulation is facilitated, the silencing effect is realized by prolonging the gas circulation path, and the silencing effect is improved by the arrangement mode of the matrix microporous structure and the annular cavity.

Drawings

The disclosure of the present invention will become more readily understood by reference to the drawings. It should be understood that: these drawings are for illustrative purposes only and are not intended to limit the scope of the present disclosure. In the figure:

FIG. 1 is an exploded view of a muffler provided in accordance with an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a muffler provided in accordance with an embodiment of the present invention;

FIG. 3 is a cross-sectional view of a muffler provided in accordance with another embodiment of the present invention;

FIG. 4 is an enlarged schematic view of an annular cavity formed between an inner shell and an outer shell;

fig. 5 is a schematic view of an annular chamber with acoustic wool disposed therein.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings. In which like parts are designated by like reference numerals. It should be noted that as used in the following description, the terms "front," "back," "left," "right," "upper" and "lower" refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.

As shown in fig. 1-2 and 4, a muffler for use in a vehicle exhaust system according to an embodiment of the present invention includes a first muffler pipe 1, a second muffler pipe 2, and a muffler case 3.

The silencer casing 3 includes an outer-layer cylinder 31 with both ends sealed by end caps 32 and an inner-layer cylinder 33 with two baffles 34 arranged inside at intervals, and the two baffles 34 are respectively provided with a plurality of baffle vent holes 342.

The two ends of the inner-layer cylinder 33 are respectively connected with the end covers 32, and an annular cavity 35 is formed between the inner-layer cylinder 33 and the outer-layer cylinder 31.

The two baffles 34 divide the cavity of the inner cylinder 33 into a first chamber 331, a second chamber 332 and a third chamber 333 in sequence.

The first silencing tube 1 passes through one end cover 32 and one baffle plate 34, the second silencing tube 2 passes through the other baffle plate 34 and the other end cover 32, the exhaust end 12 of the first silencing tube 1 is positioned in the second chamber 332, and the air inlet end 21 of the second silencing tube 2 is positioned in the second chamber 332.

A plurality of micropores 334 are arranged in a matrix on the wall of the inner cylinder 33 in the third chamber 333, and each micropore 334 communicates the annular chamber 35 with the third chamber 333.

The silencer provided by the embodiment of the invention is used in a vehicle exhaust system.

The muffler includes a first muffling pipe 1, a second muffling pipe 2, and a muffler case 3. The first silencing pipe 1 is an air inlet pipe of a silencer, and the second silencing pipe 2 is an exhaust pipe of the silencer.

The silencer casing 3 includes an outer cylinder 31, two end caps 32, an inner cylinder 33, and two baffles 34. Both ends of the outer cylinder 31 are sealed by end caps 32. The inner cylinder 33 is installed in the outer cylinder 31, and two ends of the inner cylinder 33 are respectively connected with the end covers 32 in a sealing manner. The outer diameter of the inner cylinder 33 is smaller than the inner diameter of the outer cylinder 31, and an annular cavity 35 is formed between the inner cylinder 33 and the outer cylinder 31.

Two baffles 34 are axially spaced apart in the inner shell 33, and the baffles 34 have a plurality of baffle vents 342. In the exhaust direction along the muffler, the two baffles 34 divide the cavity of the inner cylinder 33 into a first chamber 331, a second chamber 332 and a third chamber 333 in this order.

A plurality of micropores 334 are formed in a matrix arrangement on a section of the tube wall of the inner cylinder 33, and the micropores 334 are located between the baffle 34 forming the third chamber 333 and the end cap 32. Each micro-hole 334 communicates the annular chamber 35 with the third chamber 333.

The end cap 32 is provided with an end cap mounting hole 321, and the baffle 34 is provided with a baffle mounting hole 341.

The first silencing pipe 1 passes through the end cover mounting hole 321 of the end cover 32 on the air inlet side and the baffle mounting hole 341 of the baffle 34, and the first silencing pipe 1 is in interference fit with the end cover mounting hole 321 and the baffle mounting hole 341.

The intake end 11 of the first muffler pipe 1 is located outside the end cap 32 on the intake side, and the exhaust end 12 of the first muffler pipe 1 is located in the second chamber 332.

The second silencer duct 2 passes through the baffle mounting hole 341 of the baffle 34 on the exhaust side and the end cover mounting hole 321 of the end cover 32, and the second silencer duct 2 is in interference fit with the end cover mounting hole 321 and the baffle mounting hole 341. The intake end 21 of the second muffler pipe 2 is located in the second chamber 332, and the exhaust end 22 of the second muffler pipe 2 protrudes outside the end cap 32 on the exhaust side.

In the present invention, the two end plates 32 and the two baffles 34 are divided into the intake-side end plate 32 and the baffles 34 (the right end plate 32 and the baffles 34 in fig. 2 to 3) and the exhaust-side end plate 32 and the baffles 34 (the left end plate 32 and the baffles 34 in fig. 2 to 3) according to the exhaust path of the muffler.

When the silencer is installed in an exhaust system of a vehicle for use, gas enters the second chamber 332 through the first silencing pipe 1, a part of the gas enters the third chamber 333 and the first chamber 321 through the baffle vent holes 342, the gas entering the third chamber 333 enters the annular cavity 35 between the inner cylinder 33 and the outer cylinder 31 through the plurality of micropores 334 arranged in the matrix, the gas returns to the second chamber 332, and the gas in the second chamber 332 is exhausted through the second silencing pipe 2, so that the flow path of the gas is prolonged, the energy is consumed, and the silencing effect is achieved.

The annular cavity 35 forms a resonance sound absorption structure cavity with low sound quality and high impedance between the inner-layer cylinder body 33 and the outer-layer cylinder body 31, when sound waves pass through the micropores 334, the sound energy is attenuated due to energy consumption caused by friction, a wider sound absorption frequency band can be covered, and the sound attenuation effect is improved.

In conclusion, the silencer used in the vehicle exhaust system provided by the invention does not need to be filled with silencing cotton in the inner layer cylinder body 33, so that the cost is saved, the silencing cotton does not block airflow, smooth gas circulation is facilitated, the silencing effect is achieved by prolonging the gas flow path, and the silencing effect is improved by the arrangement mode of the matrix microporous structure and the annular cavity.

In one embodiment, as shown in fig. 3, a plurality of micropores 334 arranged in a matrix are also provided on the wall of the inner cylinder 33 in the first chamber 331, and each micropore 334 communicates the annular cavity 35 with the first chamber 331.

In this embodiment, the plurality of micropores 334 arranged in a matrix are disposed at both ends of the inner cylinder 33, and the gas entering the first chamber 331 also enters the annular cavity 35 through the micropores 334, so as to prolong the gas flow path, consume the sound wave energy, and further optimize the sound attenuation effect.

In one of the embodiments, as shown in fig. 2 to 3, the air intake end 21 of the second muffler pipe 2 is offset to the side of the air exhaust end 12 of the first muffler pipe 1 in the radial direction along the inner cylindrical body 33.

In the axial direction along the inner cylinder 33, the air inlet end 21 of the second muffling tube 2 and the air outlet end 12 of the first muffling tube 1 are arranged in a staggered manner, the air inlet end 21 of the second muffling tube 2 extends between the air outlet end 12 of the first muffling tube 1 and one baffle 34, and the air outlet end 12 of the first muffling tube 1 extends between the air inlet end 21 of the second muffling tube 2 and the other baffle 34.

In the present embodiment, the first muffler pipe 1 and the second muffler pipe 2 are arranged in parallel in the radial direction of the inner cylindrical body 33, and are not coaxial. In the axial direction along the inner cylindrical body 33, the intake end 21 of the second muffler pipe 2 intersects or overlaps the exhaust end 12 of the first muffler pipe 1, that is, the intake end 21 of the second muffler pipe 2 extends between the exhaust end 12 of the first muffler pipe 1 and the intake-side baffle 34, and the exhaust end 12 of the first muffler pipe 1 extends between the intake end 21 of the second muffler pipe 2 and the exhaust-side baffle 34.

The arrangement is such that gas discharged from the discharge end 12 of the first muffling pipe 1 does not immediately enter the second muffling pipe 2 through the intake end 21 and then is discharged. Because the exhaust end 12 is staggered/intersected with the inlet end 21 and not coaxial, the gas discharged from the exhaust end 12 can diffuse in the second chamber 332 and then enter the corresponding first chamber 331 and/or third chamber 333 through the baffle vent 342 to diffuse, prolong the gas flow path, consume energy, and perform a sound attenuation function.

In one embodiment, as shown in fig. 2-3, the inner cylinder 33 and the outer cylinder 31 are coaxially arranged, and the first silencing tube 1 and the inner cylinder 33 are coaxially arranged, so that the structural arrangement is convenient.

In one embodiment, as shown in fig. 5, the annular cavity 35 is filled with sound damping cotton 36. The silencing cotton 36 can be made of glass fiber silencing cotton and filled in the annular cavity 35, and the silencing cotton 36 can absorb sound waves entering the annular cavity 35 along with gas, so that the sound absorption and silencing effects are achieved, and the silencing effect is further improved. The silencing cotton 36 is annularly wrapped between the inner layer cylinder 33 and the outer layer cylinder 31, and can also play a role in preventing other noises.

In one embodiment, as shown in fig. 5, the sound-deadening cotton 36 is adhered to the inner surface of the outer cylinder 31, and the sound-deadening cotton 36 is spaced apart from the inner cylinder 33 by a predetermined distance.

Silencing cotton 36 connects on the internal surface of outer barrel 31 through the sticky, and silencing cotton 36's thickness is less than the difference between the external diameter and the internal diameter of annular chamber 35, has the certain distance between silencing cotton 36 and the inlayer barrel 33, forms certain clearance or cavity, reduces the resistance that gaseous got into annular chamber 35 through micropore 334 for gaseous accessible annular chamber 35 is passed in and out smoothly through micropore 334, and silencing cotton 36 realizes the amortization function.

In one embodiment, the first muffling tube 1 and the second muffling tube 2 are in interference fit with the corresponding end cover 32 and the baffle 34, respectively, so that the structure is stable.

In one embodiment, pores 334 are less than 1mm in diameter and create friction when gas is circulated to dissipate sound waves. The diameter of the baffle vents 342 is greater than 1mm to facilitate gas communication between adjacent chambers through the baffle vents 342.

In one embodiment, the outer cylinder 31 and the inner cylinder 33 are made of stainless steel plates by rolling, and the outer cylinder 31 and the inner cylinder 33 are connected into a whole by a flanging and seaming process. The end cover 32 and the baffle 34 are respectively formed by punching a stainless steel plate, the end cover 32 is welded with the outer-layer cylinder 31, and the baffle 34 is welded with the inner-layer cylinder 33.

An embodiment of the invention provides a vehicle, which comprises the silencer used in the vehicle exhaust system in any one of the embodiments. Specifically, the muffler is mounted on an exhaust pipe of a vehicle.

According to the needs, the above technical schemes can be combined to achieve the best technical effect.

The foregoing is considered as illustrative only of the principles and preferred embodiments of the invention. It should be noted that, for those skilled in the art, several other modifications can be made on the basis of the principle of the present invention, and the protection scope of the present invention should be regarded.

Claims

1. A muffler for use in a vehicle exhaust system, comprising a first muffler pipe, a second muffler pipe, and a muffler housing;

two ends of the inner-layer cylinder body are respectively connected with the end covers, and an annular cavity is formed between the inner-layer cylinder body and the outer-layer cylinder body;

2. The muffler for use in a vehicle exhaust system according to claim 1 wherein a plurality of said micro holes are also provided in a matrix arrangement on the wall of said inner cylinder in said first chamber, each of said micro holes communicating said annular chamber with said first chamber.

3. The muffler for use in a vehicle exhaust system according to claim 1 or 2, wherein an intake end of the second muffler pipe is offset to one side of an exhaust end of the first muffler pipe in a radial direction along the inner cylinder;

4. A muffler for use in a vehicle exhaust system according to claim 3, wherein the inner layer cylinder is arranged concentrically with the outer layer cylinder, and the first muffling pipe is arranged concentrically with the inner layer cylinder.

5. The muffler for use in a vehicle exhaust system according to claim 1 or 2 wherein the annular cavity is filled with sound damping cotton.

6. The muffler for use in a vehicle exhaust system according to claim 5, wherein the noise deadening cotton is adhered to an inner surface of the outer cylinder, the noise deadening cotton being spaced apart from the inner cylinder by a predetermined distance.

7. The muffler for use in a vehicle exhaust system according to claim 1 or 2, wherein the first muffler pipe and the second muffler pipe are interference-fitted with the corresponding end cover and the baffle plate, respectively.

8. The muffler for use in a vehicle exhaust system according to claim 1 or 2, wherein the diameter of the micro-holes is less than 1mm, and the diameter of the baffle vent holes is greater than 1mm.

9. The muffler for use in a vehicle exhaust system according to claim 1 or 2, wherein the outer-layer cylinder and the inner-layer cylinder are each formed by rolling a stainless steel plate, and the end cap and the baffle are each formed by press-molding a stainless steel plate.

10. A vehicle comprising a muffler for use in a vehicle exhaust system according to any one of claims 1 to 9.