CN107120165B - A double exhaust pipe muffler - Google Patents

Abstract

The invention discloses a muffler with double exhaust pipes, which comprises a shell, a first end cover and a second end cover respectively fixed at both ends of the shell, a first partition, a second The partition and the third partition, the air intake pipe, the left exhaust pipe, the right exhaust pipe and several guide pipes. The second pipe body of the first pipe body and the first flow guide pipe, the second flow guide pipe and the third flow guide pipe welded inside the end of the first pipe body, the left exhaust pipe passes through and fixed on the first partition and the first end cover, and the two ends are respectively connected to the second chamber and the external atmosphere; the right exhaust pipe respectively passes through and is fixed on the second partition, On the third partition and the second end cap, the two ends communicate with the second chamber and the external atmosphere respectively. The invention has good noise reduction effect, and at the same time, the air flow is smooth, the pressure loss is small, and the exhaust back pressure can meet relevant requirements.

Description

A double exhaust pipe muffler

technical field

The invention relates to a double exhaust pipe muffler, which belongs to the technical field of engine exhaust aftertreatment.

Background technique

At present, automobile exhaust noise has become one of the main noise sources affecting the environment, and installing exhaust mufflers is the main method to control exhaust noise. Due to the limitation of the installation space, it is usually impossible to ensure a large enough muffler volume. In the case of a small muffler volume, in order to ensure a good muffler effect, it is usually necessary to design the interior of the muffler very complicated, resulting in an increase in the exhaust back pressure. Large, the engine power loss increases, the economy is reduced, and the reliability of the muffler is greatly reduced.

Contents of the invention

The purpose of the present invention is to solve the existing technical problems and provide an automobile exhaust muffler with good noise reduction effect in the whole frequency range and relatively small exhaust resistance.

The present invention realizes through following technical scheme:

A muffler with double exhaust pipes, which includes a shell, a first end cover and a second end cover respectively fixed at both ends of the shell, and first partitions arranged at intervals along the axial direction of the shell in the shell , a second partition and a third partition, an air intake pipe, a left exhaust pipe, a right exhaust pipe and several guide pipes, a first chamber is formed between the first end cover and the first partition, A second chamber is formed between the first partition and the second partition, a third chamber is formed between the second partition and the third partition, and the third partition and the third partition A fourth chamber is formed between the second end caps; the air intake pipe is L-shaped, including a first pipe body parallel to the axis of the housing, a second pipe body perpendicular to the first pipe body, and a welded The first guide tube, the second guide tube and the third guide tube inside the end of the first tube body, the second tube body is located in the first chamber, and the first tube body respectively runs through the The first baffle, the second baffle and the third baffle communicate with the fourth chamber; the first baffle is also fixed with two ends connected to the first chamber and the The fourth guide tube of the fourth chamber; the first partition, the second partition and the third partition are also penetrated and fixed with two ends communicating with the first chamber and the second chamber. The fifth guide pipe; the left exhaust pipe passes through and is fixed on the first partition and the first end cover respectively, and the two ends are respectively connected to the second chamber and the external atmosphere; the right The exhaust pipe passes through and is fixed on the second partition, the third partition and the second end cover respectively, and the two ends communicate with the second chamber and the external atmosphere respectively; the left exhaust The pipe has several first through holes evenly arranged on the pipe wall located in the first chamber, and the right exhaust pipe has several second through holes evenly arranged on the pipe wall located in the fourth chamber, so The left exhaust pipe is covered with a first sound-absorbing cotton cover at the position of the first through hole, and the right exhaust pipe is covered with a second sound-absorbing cotton cover at the position of the second through hole. The cotton cover, the second sound-absorbing cotton cover and the third chamber are all filled with sound-absorbing cotton.

As a further improved technical solution of the present invention, the first pipe body, the left exhaust pipe, the right exhaust pipe, and each guide pipe are all parallel to the axis of the housing, and the purpose of parallel arrangement is to facilitate the installation of each noise reduction pipeline .

As a further improved technical solution of the present invention, the edges of the first partition, the second partition and the third partition are all provided with flanging, and the purpose and function of setting the flanging is to facilitate the welding and fixing of the partitions inside the muffler housing.

As a further improved technical solution of the present invention, the outer diameters of the first guide tube, the second guide tube and the third guide tube are equal and tangent to each other.

As a further improved technical solution of the present invention, the outer diameter of the fifth guide tube is smaller than the outer diameter of the fourth guide tube, the purpose and function of which is to allow more air flow to pass through the third through hole on the first partition It flows into the second chamber, which is good for eliminating low-frequency noise.

As a further improved technical solution of the present invention, the outer diameter and number of the first through hole and the second through hole are equal, the purpose and function of which is to use the same set of molds to open holes and reduce production costs.

As a further improved technical solution of the present invention, uniformly distributed third through holes and fourth through holes are respectively provided on the first separator and the third separator, and the diameter of the third through holes is larger than the diameter of the third through holes. The diameter of the fourth through hole. The purpose and function are to make the airflow in the first chamber of the muffler flow into the second chamber through the third through hole, and the airflow in the fourth chamber flow into the third chamber through the fourth through hole; the diameter of the fourth through hole is smaller, more Useful to eliminate high frequency noise.

As a further improved technical solution of the present invention, the first sound-absorbing cotton cover and the second sound-absorbing cotton cover are respectively provided with a number of evenly distributed fifth through holes and sixth through holes, the purpose and function of which are to make the sound-absorbing cotton The airflow in the cover is discharged through the fifth through hole and the sixth through hole.

As a further improved technical solution of the present invention, the cross-section of the housing is elliptical, which can reduce the volume and occupation of the muffler as a whole.

Compared with the prior art, the present invention can effectively reduce low-frequency noise and prevent knocking of the tailpipe by arranging three guide tubes inside the end of the first pipe body of the intake pipe; the fifth guide tube and the second chamber work together , which is equivalent to the Helmtz muffler, mainly used for low-frequency noise reduction; the intake pipe, guide pipe and exhaust pipe interact to form a three-pipe labyrinth muffler, which can well eliminate medium and high-frequency noise; the sound-absorbing material can effectively Reduce high-frequency noise; set up double exhaust pipes, the airflow can be discharged more smoothly, and the pressure loss of the muffler can be effectively reduced. With this setting, the noise of each frequency can be effectively eliminated, the noise reduction range is wide, and the noise reduction effect is good. At the same time, the air flow in the muffler is smooth, the pressure loss is small, and the exhaust back pressure can meet the relevant requirements.

Description of drawings

Fig. 1 is a sectional view of a muffler provided by an embodiment of the present invention.

Fig. 2 is a sectional view of A-A in Fig. 1 .

Fig. 3 is a B-B sectional view in Fig. 1 .

Fig. 4 is a sectional view of C-C in Fig. 1 .

Fig. 5 is a sectional view of the first sound-absorbing cotton cover.

Fig. 6 is a sectional view of the second sound-absorbing cotton cover.

Among them, 1-housing, 2-first end cap, 3-second end cap, 4-first partition, 4-1-third through hole, 5-second partition, 6-third partition , 6-1-the fourth through hole, 7-the first chamber, 8-the second chamber, 9-the third chamber, 10-the fourth chamber, 11-intake pipe, 11-1-the first pipe Body, 11-2-second pipe body, 12-fifth guide pipe, 13-fourth guide pipe, 14-left exhaust pipe, 14-1-first through hole, 15-right exhaust pipe, 15-1-the second through hole, 16-the first sound-absorbing cotton cover, 16-1-the fifth through-hole, 17-the second sound-absorbing cotton cover, 17-1-the sixth through-hole, 18-the first draft tube , 19-the second draft tube, 20-the third draft tube.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

As shown in Figure 1, the present invention is a double exhaust pipe muffler, comprising a shell 1 with an elliptical cross section, a first end cover 2 and a second end cover 3 respectively fixed at both ends of the shell 1 , the first partition 4, the second partition 5 and the third partition 6, the intake pipe 11, the left exhaust pipe 14, and the right exhaust pipe arranged in the casing 1 at intervals along the axial direction of the casing 1 15. A number of diversion tubes. Wherein, the edges of the first partition 4, the second partition 5 and the third partition 6 are all provided with flanges, and the first partition 4 and the third partition 6 are also provided with flanges. There are evenly distributed third through holes 4-1 (see Figure 2) and fourth through holes 6-1 (see Figure 4), wherein the diameter of the third through holes 4-1 is larger than that of the fourth through holes 6-1 diameter. A first chamber 7 is formed between the first end cap 2 and the first partition 4, a second chamber 8 is formed between the first partition 4 and the second partition 5, and the A third chamber 9 is formed between the second partition 5 and the third partition 6 , and a fourth chamber 10 is formed between the third partition 6 and the second end cover 3 .

The air intake pipe 11 is L-shaped, which includes a first pipe body 11-1 parallel to the axis of the housing 1, a second pipe body 11-2 perpendicular to the first pipe body 11-1 and welded on The first flow guide tube 18, the second flow guide tube 19, and the third flow guide tube 20 inside the end of the first tube body 11-1 (see FIG. 3 ). Wherein, the second pipe body 11-2 is in the first chamber 7, and the first pipe body 11-1 passes through the first partition plate 4, the second partition plate 5 and the The third partition 6 communicates with the fourth chamber 10 . The outer diameters of the first guide tube 18 , the second guide tube 19 and the third guide tube 20 are equal and tangent to each other, which can effectively reduce low-frequency noise and prevent tailpipe knocking.

In order to achieve a good middle and low frequency noise reduction effect, a fourth guide pipe 13 with two ends connecting the first chamber 7 and the fourth chamber 10 is fixed through the first partition 4; The first dividing plate 4, the second dividing plate 5 and the third dividing plate 6 are also penetrated and fixed with a fifth draft tube 12 whose two ends communicate with the first chamber 7 and the second chamber 8; wherein ,

The outer diameter of the fifth guide tube 12 is smaller than the outer diameter of the fourth guide tube 13 . The air flow enters the fourth chamber 10 from the air inlet pipe 11, and then flows into the first chamber 7 through the fourth guide pipe 13, and the air flow in the first chamber 7 passes through the first chamber 7. The third through hole 4-1 on the partition 4 and the fifth guide pipe 12 enter the second chamber 8, and finally flow out from the left exhaust pipe 14 and the right exhaust pipe 15 . The fifth guide tube 12 works together with the second chamber 8, which is equivalent to a Helmtz muffler, which is mainly used for low-frequency noise reduction; this part forms a three-pipe labyrinth muffler, which helps eliminate noise in the middle and low frequency bands.

The left exhaust pipe 14 passes through and is fixed on the first partition plate 4 and the first end cover 2 respectively, and the two ends communicate with the second chamber 8 and the external atmosphere respectively, and the right exhaust pipe 14 The tubes 15 respectively pass through and are defined on the second partition 5 , the third partition 6 and the second end cover 3 , and the two ends respectively communicate with the second chamber 8 and the external atmosphere. The left exhaust pipe 12 , the right exhaust pipe 15 , the second pipe body 11 - 2 and each guide pipe are parallel. The left exhaust pipe 14 is provided with a first through hole 14-1 on the pipe wall located in the first chamber 7, and the right exhaust pipe 15 is arranged on the pipe wall located in the fourth chamber 10. A second through hole 15-1 is arranged on the wall, and the diameter and number of the first through hole 14-1 and the second through hole 15-1 are equal. The left exhaust pipe 14 is sleeved with a first sound-absorbing cotton cover 16 at the position of the first through hole 14-1, and the right exhaust pipe 15 is sleeved with a second sound-absorbing cotton cover at the position of the second through hole 15-1. Two sound-absorbing cotton covers 17. The first sound-absorbing cotton cover 16 is provided with uniformly distributed fifth through holes 16-1 (see Figure 5), and the second sound-absorbing cotton cover 17 is provided with evenly distributed sixth through-holes 17-1 (see Figure 5). Figure 6). The first sound-absorbing cotton cover 16 , the second sound-absorbing cotton cover 17 and the third chamber 9 are all filled with sound-absorbing cotton, which can effectively eliminate mid-high frequency noise.

The above examples are only to illustrate the technical concept and characteristics of the present invention, and are not used to limit the protection scope of the present invention. Those skilled in the art can easily modify the present invention or replace it equivalently, and these implementation modes are all included in the protection scope of the present invention. within range.

Claims (10)

1. The double exhaust pipe muffler comprises a shell, a first end cover, a second end cover, a first partition plate, a second partition plate, a third partition plate, an air inlet pipe, a left exhaust pipe, a right exhaust pipe and a plurality of flow guide pipes, wherein the first end cover and the second end cover are respectively fixed at two ends of the shell; the method is characterized in that: the air inlet pipe is L-shaped and comprises a first pipe body parallel to the axis of the shell, a second pipe body perpendicular to the first pipe body, and a first flow guide pipe, a second flow guide pipe and a third flow guide pipe which are welded inside the tail end of the first pipe body, wherein the second pipe body is positioned in the first cavity, and the first pipe body penetrates through the first partition plate, the second partition plate and the third partition plate respectively to be communicated with the fourth cavity; the first partition plate is also fixedly penetrated by a fifth flow guide pipe with two ends communicated with the first cavity and the second cavity, and the fifth flow guide pipe and the second cavity are jointly used for low-frequency silencing; the first baffle plate, the second baffle plate and the third baffle plate are also fixedly penetrated by a fourth flow guide pipe with two ends communicated with the first chamber and the fourth chamber; the left exhaust pipe penetrates through and is fixed on the first partition board and the first end cover respectively, and two ends of the left exhaust pipe are communicated with the second chamber and the external atmosphere respectively; the right exhaust pipe penetrates through and is fixed on the second partition board, the third partition board and the second end cover respectively, and two ends of the right exhaust pipe are communicated with the second chamber and the external atmosphere respectively; the left exhaust pipe is located a plurality of first through holes are evenly arranged on the pipe wall in the first cavity, the right exhaust pipe is located a plurality of second through holes are evenly arranged on the pipe wall in the fourth cavity, the left exhaust pipe is sleeved with a first sound-absorbing cotton cover at the position of the first through hole, the right exhaust pipe is sleeved with a second sound-absorbing cotton cover at the position of the second through hole, and sound-absorbing cotton used for eliminating medium-high frequency noise is filled in the first sound-absorbing cotton cover, the second sound-absorbing cotton cover and the third cavity.

2. The double exhaust muffler as defined in claim 1, wherein: the first pipe body, the left exhaust pipe, the right exhaust pipe and the honeycomb ducts are all parallel to the axis of the shell.

3. The double exhaust muffler as defined in claim 1, wherein: the edges of the first baffle, the second baffle and the third baffle are provided with flanging.

4. The double exhaust muffler as claimed in claim 1 or 2, wherein: the outer diameters of the first guide pipe, the second guide pipe and the third guide pipe are equal and tangential to each other.

5. The double exhaust muffler as defined in claim 1, wherein: the outer diameter of the fifth flow guide pipe is smaller than that of the fourth flow guide pipe.

6. The double exhaust muffler according to any one of claims 1 to 3 and claim 5, wherein: the outer diameters and the number of the first through holes and the second through holes are equal.

7. The double exhaust muffler as defined in claim 4, wherein: the outer diameters and the number of the first through holes and the second through holes are equal.

8. The double exhaust muffler as defined in claim 1, wherein: the first partition plate and the third partition plate are respectively provided with a third through hole and a fourth through hole which are uniformly distributed, and the diameter of the third through hole is larger than that of the fourth through hole.

9. The double exhaust muffler as defined in claim 1, wherein: the first sound-absorbing cotton cover and the second sound-absorbing cotton cover are respectively provided with a plurality of fifth through holes and sixth through holes which are uniformly distributed.

10. The double exhaust muffler as defined in claim 1, wherein: the cross section of the shell is elliptic.

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