Automobile exhaust silencer

Abstract

The invention provides an automobile exhaust silencer. The automobile exhaust silencer comprises a front silencer body, a rear silencer body and an exhaust pipe connected with the front silencer body and the rear silencer body. The first silencing pipe is of a through design so as to quickly lead out exhaust gas, exhaust sound waves enter the first silencing cavity through the first silencing air holes, part of the sound waves enter the second silencing cavity through the second silencing air holes, a circulating silencing channel is formed, the sound waves continuously penetrate through the air holes, and sound energy is gradually weakened by means of the mutual interference and offset phenomenon of sound wave reflection. The noise reduction cotton further absorbs noise, and the noise reduction effect is improved; the folded plate pieces are used for increasing the flow dividing area, and therefore the silencing effect is improved. The second silencing pipe comprises a silencing barrel and silencing branch pipes, a plurality of groups of flow guide plates are distributed on the silencing barrel, the flow guide plates are used for dividing the airflow guided into the silencing barrel, finally, the remaining airflow is discharged through the silencing branch pipes, and the airflow is mutually impacted by means of multiple times of airflow division, so that the airflow energy is consumed, and the silencing effect is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of mufflers, in particular to an automobile exhaust muffler. Background Art

[0002] In order to reduce the noise generated by the exhaust of automobile exhaust, a muffler is usually installed in the exhaust emission component to silence the noise generated by the exhaust.

[0003] The existing muffler generally uses a baffle to divide the inside of the muffler into multiple cavities. The baffle is provided with through holes. The airflow passes through the baffle for multiple flow control to achieve a silencing effect. However, the existing silencing method can reduce the sound intensity, but the frequency of the sound is still within the audible range. When it is close, a loud noise can still be heard, and the silencing effect is poor. For this reason, we provide an automobile exhaust muffler, which improves the silencing effect of the muffler through a good internal noise reduction structure design of the muffler. Summary of the invention

[0004] The technical problem solved by the present invention is to provide an automobile exhaust muffler with multiple groups of muffler structures to solve the problems raised in the above background technology.

[0005] The technical problem solved by the present invention is achieved by adopting the following technical solution: an automobile exhaust muffler comprises a front muffler, a rear muffler, and an exhaust pipe connecting the front muffler and the rear muffler, wherein: Front muffler includes: A first shell body, the first shell body is a hollow cylindrical structure, a first air intake branch pipe is installed on one side of the first shell body, and an exhaust branch pipe is installed on the other side; A first silencer pipe, the first silencer pipe is connected with the first intake branch pipe and the first exhaust branch pipe in an integrated manner, and first silencer holes are distributed on the first silencer pipe; A folded plate member, which is a hollow folded column structure surrounding the first silencer pipe, and includes a plurality of folded plates spliced ​​together, and second silencer air holes are distributed on the folded plates; A first silencer chamber is formed between the folding plate and the first silencer pipe, and a second silencer chamber is formed between the folding plate and the first shell, wherein the second silencer chamber is filled with silencer cotton; The rear silencer includes: A second shell body, the second shell body is a hollow cylindrical structure, a second air intake branch pipe is installed on one side of the second shell body, and an exhaust tail pipe is installed on the other side; A second silencer pipe, the second silencer pipe is connected to the second air intake branch pipe, the second silencer pipe comprises an integral silencer tube and a silencer branch pipe, the silencer tube is provided with third silencer air holes, and the silencer branch pipe is provided with fourth silencer air holes; A third silencer pipe is connected to the exhaust tail pipe, and sixth silencer air holes are distributed and installed on the third silencer pipe.

[0006] As a further embodiment of the present invention: A ring plate is installed at the corresponding position of the first silencer pipe, and a folding plate corresponding to the ring plate is provided with a toothed column, and the folding plate is sleeved and fixed on the toothed column to fix one side of the folding plate, and a sealing plate is provided on the other side of the folding plate, and the sealing plate is connected to the first shell and the first silencer pipe to form a third silencer chamber, and a seventh silencer air hole connected to the first silencer chamber and the second silencer chamber is provided on the sealing plate, and the third silencer chamber is filled with silencer cotton. The folding plate is used to increase the area of ​​the diversion, thereby improving the silencer effect.

[0007] As a further embodiment of the present invention: A plurality of guide plates are distributed in the silencer, each of which is an arc-shaped raised structure with one side of the raised structure facing the second air intake branch pipe to divert the exhaust air flow. An eighth silencer hole is distributed on the guide plate to reduce the air flow velocity and guide the air flow to the third silencer hole.

[0008] As a further embodiment of the present invention: The silencer cylinder is provided with a cylinder plate on one side facing the third silencer pipe, and the third silencer air holes are distributed and installed on the cylinder plate to guide the airflow to the other side.

[0009] As a further embodiment of the present invention: The fourth silencer air holes are annularly distributed and arranged on the upper silencer branch pipe, and a cross-shaped pipe opening is arranged at the end of the silencer branch pipe to guide out the remaining airflow.

[0010] As a further embodiment of the present invention: The second shell is also equipped with a partition member, which includes a partition plate installed in the second shell and a buffer tube distributed and installed on the partition plate. The partition plate divides the second shell into a first cavity and a second cavity. The buffer tube is used to further divert and reduce the noise of the airflow in the first cavity.

[0011] As a further embodiment of the present invention: The second silencer pipe is installed in the first cavity, the third silencer pipe is installed in the second cavity, and the buffer pipe is a hollow structure for connecting the first cavity and the second cavity.

[0012] As a further embodiment of the present invention: The partition plate is provided with a corresponding through hole corresponding to the buffer tube, and the buffer tube is fixedly inserted and installed in the through hole. One end of the buffer tube extends into the first cavity, and the other end extends into the second cavity. Both ends of the outer side of the buffer tube are closed, and the arc-shaped side of the buffer tube is distributed with a fifth silencer air hole to connect the first cavity and the second cavity.

[0013] As a further embodiment of the present invention: Hooks are respectively provided at the outer ends of the first shell, the exhaust pipe and the second shell, and the hooks are connected to the chassis bracket of the automobile through rubber hanging ears to reduce vibration of the components and thus reduce noise. Compared with the prior art, the beneficial effects of the present invention are as follows: the front silencer is an absorption silencer, the first silencer pipe is a through-type design to quickly discharge the exhaust gas, the exhaust sound waves enter the first silencer chamber through the first silencer air hole, and part of the sound waves enter the second silencer chamber through the second silencer air hole, forming a circulating silencer channel, the sound waves continuously pass through the air holes, and the phenomenon of mutual interference and cancellation of sound wave reflections is utilized to gradually weaken the sound energy, the silencer cotton further absorbs the noise, and the silencer effect is improved; the folding plate is used to increase the diversion area, and angular grooves are formed between adjacent folding plates, and when the sound waves pass through the second silencer air hole, they will interfere with and cancel each other, thereby improving the silencer effect.

[0014] The rear silencer is a reflective silencer. The second silencer pipe includes a silencer cylinder and a silencer branch pipe. The silencer cylinder is provided with a plurality of guide plates. The guide plates are used to divert the airflow introduced into the silencer cylinder. A part of the airflow is discharged into the first cavity through the third silencer air hole, and a part of the airflow continues to move forward and is diverted through the second group of guide plates. Finally, the remaining airflow is discharged through the silencer branch pipe. Multiple airflow diversions are used to make the airflows impact each other, thereby consuming the airflow energy and achieving the effect of silence. This is the first step of the silencer structure of the rear silencer. The partition plate divides the second shell into a first cavity and a second cavity, and the airflow in the first cavity is guided into the second cavity by using the buffer tubes distributed on the partition plate. The two sides of the buffer tubes are closed structures, and the airflow is guided by the fifth silencer air hole on the side of the buffer tube; the partition plate divides the second shell into different cavities, and multiple flow controls are used to make the exhaust sound waves interfere with each other and cancel each other out, and multiple channels are formed by the distributed buffer tubes to divert the airflow. After the airflows are gathered in the second cavity, they impact each other to consume the energy of the airflow and achieve further diversion and noise reduction, which is the second-step silencer structure of the rear silencer; The airflow in the second cavity enters the third silencer pipe through the sixth silencer air hole and is discharged through the exhaust tail pipe that gradually expands outward to further reduce the airflow velocity and reduce the airflow business, which is the third silencer structure of the rear silencer. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the overall cross-sectional structure of the present invention; Figure 3 The partial cross-sectional structure of the front muffler of the present invention is shown in FIG. Figure 1 ; Figure 4The partial cross-sectional structure of the front muffler of the present invention is shown in FIG. Figure 2 ; Figure 5 It is a partial cross-sectional structural schematic diagram of the rear muffler of the present invention; Figure 6 It is a flow direction indication diagram of the exhaust sound wave and airflow of the front muffler of the present invention; Markings in the figure: 1. front silencer; 2. rear silencer; 3. exhaust pipe; 4. folding plate; 5. second silencer pipe; 6. partition plate; 11. first shell; 12. first intake branch pipe; 13. exhaust branch pipe; 14. first silencer pipe; 15. first silencer air hole; 16. first silencer chamber; 17. second silencer chamber; 18. silencer cotton; 19. third silencer chamber; 21. second shell; 22. second intake branch pipe; 23. exhaust tail pipe; 24. third silencer Sound tube; 25, the sixth silencer air hole; 26, the first cavity; 27, the second cavity; 31, the hook; 41, the second silencer air hole; 42, the ring plate; 43, the toothed column; 44, the sealing plate; 45, the seventh silencer air hole; 51, the silencer cylinder; 52, the silencer branch pipe; 53, the third silencer air hole; 54, the fourth silencer air hole; 55, the guide plate; 56, the eighth silencer air hole; 57, the cylinder plate; 58, the cross-shaped pipe mouth; 61, the buffer tube; 62, the fifth silencer air hole. DETAILED DESCRIPTION

[0016] In order to make the technical means for realizing the present invention, the creative features, the objectives and effects to be achieved easily understood, the present invention is further described below with reference to specific diagrams.

[0017] like Figures 1 to 6 As shown, This embodiment provides an automobile exhaust muffler, comprising a front muffler 1, a rear muffler 2, and an exhaust pipe 3 connecting the front muffler 1 and the rear muffler 2, wherein: Front silencer 1 includes: A first shell 11, which is a hollow cylindrical structure. A first intake branch pipe 12 is installed on one side of the first shell 11, and an exhaust branch pipe 13 is installed on the other side; A first silencer pipe 14, the first silencer pipe 14 is connected with the first intake branch pipe 12 and the first exhaust branch pipe 13 in an integrated manner, and first silencer holes 15 are distributed on the first silencer pipe 14; A folded plate member, which is a hollow folded column structure surrounding the first silencer pipe 14, and includes a plurality of folded plates 4 spliced ​​together, and second silencer air holes 41 are distributed on the folded plates 4; A first silencing chamber 16 is formed between the folding plate and the first silencing pipe 14, and a second silencing chamber 17 is formed between the folding plate and the first shell 11. The second silencing chamber 17 is filled with silencing cotton 18. Rear silencer 2 includes: A second housing 21, which is a hollow cylindrical structure. A second intake branch pipe 22 is installed on one side of the second housing 21, and an exhaust tail pipe 23 is installed on the other side; A second silencer pipe 5, which is connected to the second air intake branch pipe 22, and includes a silencer cylinder 51 and a silencer branch pipe 52 which are integrally arranged, the silencer cylinder 51 is provided with third silencer air holes 53, and the silencer branch pipe 52 is provided with fourth silencer air holes 54; The third silencer pipe 24 is connected to the exhaust tail pipe 23 , and sixth silencer holes 25 are distributed and installed on the third silencer pipe 24 .

[0018] like Figure 2 , Figure 3 and 4 As shown, in this embodiment, a ring plate 42 is installed at the corresponding position of the first silencer pipe 14, and a folding plate corresponding to the ring plate 42 is provided with a toothed column 43, and the folding plate is sleeved and fixed on the toothed column 43 to fix one side of the folding plate, and a sealing plate 44 is provided on the other side of the folding plate, and the sealing plate 44 is connected to the first shell 11 and the first silencer pipe 14, and forms a third silencer chamber 19, and a seventh silencer air hole 45 connected to the first silencer chamber 16 and the second silencer chamber 17 is provided on the sealing plate 44, and the third silencer chamber 19 is filled with silencer cotton 18. The folding plate is used to increase the area of ​​the diversion, thereby improving the silencing effect.

[0019] like Figure 2 and 5 As shown, in this embodiment, a plurality of groups of guide plates 55 are distributed in the silencer 51. The guide plates 55 are arc-shaped protruding structures, and one side of the protrusion faces the second air intake branch pipe 22 to divert the exhaust gas flow. An eighth silencer hole 56 is distributed on the guide plate 55 to reduce the air flow velocity and guide the air flow to the third silencer hole 53.

[0020] The muffler cylinder 51 is provided with a cylinder plate 57 on one side facing the third muffler pipe 24 , and the third muffler air holes 53 are distributed and installed on the cylinder plate 57 to guide the airflow to the other side.

[0021] The fourth silencer air holes 54 are annularly distributed on the upper silencer branch pipe 52 , and a cross-shaped pipe opening 58 is provided at the end of the silencer branch pipe 52 to guide out the remaining airflow.

[0022] The second shell 21 is also equipped with a partition member, which includes a partition plate 6 installed in the second shell 21 and a buffer tube 61 distributed and installed on the partition plate 6. The partition plate 6 divides the second shell 21 into a first cavity 26 and a second cavity 27. The buffer tube 61 is used to further divert and reduce the noise of the airflow in the first cavity 26.

[0023] The second silencer pipe 5 is installed in the first cavity 26 , the third silencer pipe 24 is installed in the second cavity 27 , and the buffer pipe 61 is a hollow structure for connecting the first cavity 26 and the second cavity 27 .

[0024] The partition plate 6 is provided with a corresponding through hole corresponding to the buffer tube 61, and the buffer tube 61 is fixedly inserted and installed in the through hole. One end of the buffer tube 61 extends into the first cavity 26, and the other end extends into the second cavity 27. Both ends of the outer side of the buffer tube 61 are closed, and the arc-shaped side surface of the buffer tube 61 is distributed with a fifth silencer air hole 62 to connect the first cavity 26 and the second cavity 27.

[0025] like Figure 1 As shown, in this embodiment, the outer ends of the first shell 11, the exhaust pipe 3 and the second shell 21 are respectively provided with hooks 31, and the hooks 31 are connected to the automobile chassis bracket through rubber ears to dampen the components and thus reduce noise.

[0026] The working principle of the present invention is: The front silencer 1 is an absorption silencer. The first silencer pipe 14 is a through-type design to quickly discharge the exhaust gas. The exhaust sound waves enter the first silencer chamber 16 through the first silencer air hole 15, and part of the sound waves enter the second silencer chamber 17 through the second silencer air hole 41, forming a circulating silencer channel. The sound waves continuously pass through the air holes, and the sound energy is gradually weakened by the phenomenon of mutual interference and cancellation of sound wave reflections. The silencer cotton 18 further absorbs the noise and improves the silencer effect. The folding plate is used to increase the diversion area, thereby improving the silencer effect. Figure 6 It is an indication diagram of the exhaust sound wave and airflow direction of the front muffler 1.

[0027] The rear silencer 2 is a reflective silencer. The second silencer pipe 5 includes a silencer cylinder 51 and a silencer branch pipe 52. The silencer cylinder 51 is provided with a plurality of guide plates 55. The guide plates 55 are used to divert the airflow introduced into the silencer cylinder 51. A portion of the airflow is discharged into the first cavity 26 through the third silencer air hole 53, and a portion of the airflow continues to move forward and is diverted through the second group of guide plates 55. Finally, the remaining airflow is discharged through the silencer branch pipe 52. Multiple airflow diversions are used to make the airflows impact each other, thereby consuming the airflow energy and achieving the effect of silence. This is the first step of the silencer structure of the rear silencer 2. The partition plate 6 divides the second shell 21 into a first cavity 26 and a second cavity 27. The airflow in the first cavity 26 is guided into the second cavity 27 by using the buffer tube 61 distributed on the partition plate 6. The two sides of the buffer tube 61 are closed structures, and the airflow is guided by the fifth silencer air hole 62 on the side of the buffer tube 61. The partition plate 6 divides the second shell 21 into different cavities, and multiple flow controls are used to make the exhaust sound waves interfere with each other and cancel each other, and multiple channels are formed by the distributed buffer tubes 61 to divert the airflow. After the airflows are gathered in the second cavity 27, they impact each other to consume the energy of the airflow and achieve further diversion and noise reduction. This is the second-step silencer structure of the rear silencer 2. The airflow in the second cavity 27 enters the third silencer pipe 24 through the sixth silencer air hole 25 and is discharged through the exhaust tail pipe 23 that gradually expands outward to further reduce the airflow speed and reduce the airflow business, which is the third silencer structure of the rear silencer 2.

[0028] The above shows and describes the basic principle and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents. It should be noted that, in this article, if there are relational terms such as first and second, it is only used to distinguish one entity or operation from another entity or operation, and does not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the term "includes", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. An automobile exhaust muffler, comprising a front muffler, a rear muffler, and an exhaust pipe connecting the front muffler and the rear muffler, characterized in that: in: Front muffler includes: A first shell body, the first shell body is a hollow cylindrical structure, a first air intake branch pipe is installed on one side of the first shell body, and an exhaust branch pipe is installed on the other side; A first silencer pipe, the first silencer pipe is connected with the first intake branch pipe and the first exhaust branch pipe in an integrated manner, and first silencer holes are distributed on the first silencer pipe; A folded plate member, which is a hollow folded column structure surrounding the first silencer pipe, and includes a plurality of folded plates spliced ​​together, and second silencer air holes are distributed on the folded plates; A first silencer chamber is formed between the folding plate and the first silencer pipe, and a second silencer chamber is formed between the folding plate and the first shell, wherein the second silencer chamber is filled with silencer cotton; The rear silencer includes: A second shell body, the second shell body is a hollow cylindrical structure, a second air intake branch pipe is installed on one side of the second shell body, and an exhaust tail pipe is installed on the other side; A second silencer pipe, the second silencer pipe is connected to the second air intake branch pipe, the second silencer pipe comprises an integral silencer tube and a silencer branch pipe, the silencer tube is provided with third silencer air holes, and the silencer branch pipe is provided with fourth silencer air holes; A third silencer pipe is connected to the exhaust tail pipe, and sixth silencer air holes are distributed and installed on the third silencer pipe.

2. The automobile exhaust muffler according to claim 1, characterized in that: An annular plate is installed at the corresponding position of the first silencer pipe, and the folding plate corresponding to the annular plate is provided with a toothed column, and the folding plate is sleeved and fixed on the toothed column to fix one side of the folding plate, and a sealing plate is provided on the other side of the folding plate, and the sealing plate is connected to the first shell and the first silencer pipe to form a third silencer chamber, and the sealing plate is provided with a seventh silencer air hole connected to the first silencer chamber and the second silencer chamber, and the third silencer chamber is filled with silencer cotton.

3. The automobile exhaust muffler according to claim 1, characterized in that: A plurality of guide plates are distributed in the silencer, each of which is an arc-shaped raised structure with one side of the raised structure facing the second air intake branch pipe to divert the exhaust air flow. An eighth silencer hole is distributed on the guide plate to reduce the air flow velocity and guide the air flow to the third silencer hole.

4. The automobile exhaust muffler according to claim 3, characterized in that: The silencer cylinder is provided with a cylinder plate on one side facing the third silencer pipe, and the third silencer air holes are distributed and installed on the cylinder plate to guide the airflow to the other side.

5. The automobile exhaust muffler according to claim 3, characterized in that: The fourth silencer air holes are annularly distributed and arranged on the upper silencer branch pipe, and a cross-shaped pipe opening is arranged at the end of the silencer branch pipe to guide out the remaining airflow.

6. The automobile exhaust muffler according to claim 3, characterized in that: The second shell is also equipped with a partition member, which includes a partition plate installed in the second shell and a buffer tube distributed and installed on the partition plate. The partition plate divides the second shell into a first cavity and a second cavity. The buffer tube is used to further divert and reduce the noise of the airflow in the first cavity.

7. The automobile exhaust muffler according to claim 6, characterized in that: The second silencer pipe is installed in the first cavity, the third silencer pipe is installed in the second cavity, and the buffer pipe is a hollow structure for connecting the first cavity and the second cavity.

8. The automobile exhaust muffler according to claim 7, characterized in that: The partition plate is provided with a corresponding through hole corresponding to the buffer tube, and the buffer tube is fixedly inserted and installed in the through hole. One end of the buffer tube extends into the first cavity, and the other end extends into the second cavity. Both ends of the outer side of the buffer tube are closed, and the arc-shaped side of the buffer tube is distributed with a fifth silencer air hole to connect the first cavity and the second cavity.

9. The automobile exhaust muffler according to claim 1, characterized in that: The outer ends of the first shell, the exhaust pipe and the second shell are respectively provided with hooks, and the hooks are connected to the automobile chassis bracket through rubber hanging ears.

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