Automobile exhaust silencer

Abstract

The utility model discloses an automobile exhaust silencer, and belongs to the technical field of automobile silencers. The silencer mainly comprises a shell assembly, a silencing mechanism is arranged in the shell assembly, an air inlet pipe communicated with an air inlet of the silencing mechanism and an air outlet pipe communicated with an air outlet of the silencing mechanism are arranged on the shell assembly, a valve is arranged at the end, extending into the shell assembly, of the air inlet pipe and comprises a valve body, and the valve body is fixedly connected with the air inlet pipe in a sealed mode. The upper portion of the valve body is rotationally connected with a valve deck, and an elastic assembly is arranged between the valve deck and the valve body. According to the automobile exhaust silencer, the valve is additionally arranged, the flow speed of airflow entering the silencer is reduced, noise generated by friction between the airflow and a silencer pipeline is greatly reduced, and the noise reduction and silencing effect of automobile exhaust is improved. The utility model is mainly used for an automobile exhaust system.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of automobile muffler, concretely, especially relates to a automobile exhaust muffler. BACKGROUND

[0002] The main function of the automobile exhaust muffler is to reduce the exhaust noise of the engine while ensuring smooth exhaust. The most commonly used structure of the automobile exhaust system muffler is the automobile exhaust system rear muffler disclosed in the patent with the announcement number "CN206530393U". When in use, the airflow enters through the air inlet, and when flowing through various sound-absorbing units (expansion chambers, resonance chambers, etc. composed of pipes, partitions, etc.) inside the muffler, the airflow will reflect and interfere, thereby reducing the sound energy and achieving the purpose of sound absorption.

[0003] However, the following problems exist in actual use: 1. When the airflow flow rate of the air inlet is too fast, the volume of the muffler needs to be increased accordingly to achieve a certain sound-absorbing effect, which leads to a larger muffler volume, which is not conducive to vehicle data arrangement and the assembly of the sound-absorbing muffler on the production line after engineering; 2. When the internal volume of the muffler is constant, it is difficult to greatly improve the sound-absorbing effect of the muffler. CONTENT OF THE UTILITY MODEL

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide an automobile exhaust muffler which reduces the airflow flow rate into the muffler by increasing the valve, thereby greatly reducing the noise generated by the airflow friction with the muffler pipeline and improving the noise reduction and sound-absorbing effect of the automobile exhaust.

[0005] The automobile exhaust muffler comprises a shell assembly, an sound-absorbing mechanism is arranged in the shell assembly, an air inlet pipe in communication with an air inlet of the sound-absorbing mechanism and an air outlet pipe in communication with an air outlet of the sound-absorbing mechanism are arranged on the shell assembly, a valve is arranged on the end of the air inlet pipe extending into the shell assembly, the valve comprises a valve body, the valve body is sealingly and fixedly connected with the air inlet pipe, a valve cover is rotatably connected to the upper part of the valve body, and an elastic component is arranged between the valve cover and the valve body.

[0006] Preferably, ear plates one are fixedly connected to the two sides of the upper part of the valve body, a rotating shaft is arranged between the two ear plates one, ear plates two corresponding to the ear plates one are fixedly connected to the valve cover, the ear plates two are rotatably connected with the rotating shaft, the elastic component is a torsion spring, the elastic component is sleeved on the rotating shaft, one end of the elastic component abuts against the valve cover, and the other end of the elastic component abuts against the valve body.

[0007] Preferably, a buffer gasket is fixedly connected to the inner end face of the valve body matched with the valve cover.

[0008] Preferably, the buffer gasket is made of stainless steel wire wool.

[0009] Preferably, the air inlet pipe is provided with a plurality of air outlet holes on the pipe wall inside the shell assembly.

[0010] Preferably, the air inlet pipe is fixedly connected with a support plate on the outer side wall of the shell assembly away from the valve body, and the support plate is fixedly connected with the shell assembly.

[0011] Preferably, the shell assembly is sequentially provided with a first chamber, a second chamber, a third chamber and a fourth chamber in sequence, and the air inlet pipe is communicated with the first chamber; the sound attenuation mechanism comprises a first sound attenuation pipe, a second sound attenuation pipe and a third sound attenuation pipe, the air inlet end of the first sound attenuation pipe is communicated with the first chamber, the air outlet end of the first sound attenuation pipe is communicated with the fourth chamber, the air inlet end of the second sound attenuation pipe is communicated with the fourth chamber, the air outlet end of the second sound attenuation pipe is communicated with the second chamber, the air inlet end of the third sound attenuation pipe is communicated with the second chamber, and the air outlet end of the third sound attenuation pipe is communicated with the air outlet pipe.

[0012] Preferably, a plurality of sound attenuation holes are formed in the first sound attenuation pipe and the second sound attenuation pipe in the third chamber, respectively.

[0013] Preferably, sound attenuation holes are formed in the sealing partitions on the two sides of the third chamber, respectively.

[0014] Compared with the prior art, the utility model has the advantages that:

[0015] 1. The valve is additionally arranged at the tail end of the air inlet pipe, the valve reduces the flow rate of the airflow into the muffler, thereby greatly reducing the noise generated by the friction between the airflow and the sound attenuation mechanism pipeline in the muffler; after the airflow speed is reduced, the sound energy entering the muffler is also reduced, and the required volume when the interference cancellation occurs is also reduced, so that the automobile exhaust muffler is smaller and more compact under the premise of ensuring good noise reduction and sound attenuation, and is beneficial to the overall arrangement of the vehicle.

[0016] 2. The buffer gasket is additionally arranged on the inner end face of the valve body, the buffer gasket is made of stainless steel wire wool, the buffer gasket with the steel wire wool structure can play a good buffering effect, reduce the impact force when the valve cover is closed, reduce the impact sound of the valve cover on the valve body, and improve the durability of the valve structure.

[0017] 3. The support plate is fixedly connected with the outer side wall of the shell assembly away from the valve body, the support plate increases the support strength of the air inlet pipe, and prevents the pipeline from being broken due to excessive weight after the valve is additionally arranged at the tail end of the air inlet pipe. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is an external structure schematic diagram of the utility model;

[0019] Figure 2 It is an internal structure schematic diagram of the utility modelFigure 1 ;

[0020] Figure 3 The internal structure of the utility model Figure 2 ;

[0021] Figure 4 The structure diagram of the valve closed state

[0022] Figure 5 The structure diagram of the valve open state.

[0023] In the figure, 1, air inlet pipe; 101, air outlet hole; 2, shell assembly; 201, sealing side plate; 202, first baffle; 203, second baffle; 204, third baffle; 205, second sound hole; 206, support plate; 207, first chamber; 208, second chamber; 209, third chamber; 210, fourth chamber; 3, air outlet pipe; 4, valve; 401, valve body; 402, valve cover; 403, rotating shaft; 404, elastic assembly; 405, buffer washer; 5, first sound reduction pipe; 6, second sound reduction pipe; 7, third sound reduction pipe. DETAILED DESCRIPTION

[0024] The utility model will be further described below in conjunction with the drawings:

[0025] The orientation terms involved in the paragraphs of detailed description are only for the convenience of the person skilled in the art to understand the technical solutions recorded in the application according to the visual orientation shown in the drawings. Except for explicit provisions and limitations, the terms such as "setting", "installing", "connecting" should be understood broadly, and for the person skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0026] As Figures 1 to 5 shown, an automobile exhaust silencer comprises a shell assembly 2, the shell assembly 2 is internally provided with a sound reduction mechanism, the shell assembly 2 serves as the external protection and support structure of the whole silencer, and provides mounting space for the internal sound reduction mechanism and other components. In the embodiment, the shell assembly 2 is made of a metal material with high strength, high temperature resistance and corrosion resistance, preferably stainless steel material, so as to ensure that it can withstand the influence of high temperature exhaust and vibration and other environmental factors during the operation of the automobile.

[0027] In the embodiment, the position close to one end of the shell assembly 2 is provided with an air inlet pipe 1 communicated with the air inlet of the sound reduction mechanism, the automobile exhaust enters the utility model through the air inlet pipe 1, the end of the air inlet pipe 1 extending into the shell assembly 2 is provided with a valve 4, and a plurality of air outlet holes 101 are formed on the pipe wall inside the shell assembly 2, and the other end of the shell assembly 2 is provided with an air outlet pipe 3 communicated with the air outlet of the sound reduction mechanism, and the exhaust gas after sound reduction is discharged from the silencer through the air outlet pipe 3.

[0028] As Figure 4 and Figure 5 The valve 4 includes a valve body 401 and a valve cover 402, wherein the valve body 401 is sealingly and fixedly connected with the air inlet pipe 1 to ensure that the exhaust gas cannot leak from the connection part. The upper part of the valve body 401 is rotatably connected with the valve cover 402, and an elastic component 404 is arranged between the valve cover 402 and the valve body 401, i.e. the valve cover 402 is in a normally closed state. Specifically, the upper part of the valve body 401 is fixedly connected with an ear plate one on both sides, and a rotating shaft 403 is fixedly connected between the two ear plate ones. The valve cover 402 is fixedly connected with an ear plate two corresponding to the ear plate one, and the ear plate two is provided with a mounting hole rotatably matched with the rotating shaft 403. The ear plate two is rotatably connected with the rotating shaft 403 through the mounting hole. The elastic component 404 is a torsion spring and is sleeved on the rotating shaft 403. One end of the elastic component 404 abuts against the valve cover 402, and the other end of the elastic component 404 abuts against the valve body 401. The elastic component 404 provides elastic force for the closing of the valve cover 402. By replacing the elastic component 404 of different elastic systems, the minimum impact force for opening the valve 4 can be controlled.

[0029] The valve body 401 is fixedly connected with a buffer gasket 405 on the inner end face matched with the valve cover 402. The buffer gasket 405 is made of stainless steel wire wool. During installation, the buffer gasket 405 is welded on the inner end face of the valve body 401. The buffer gasket 405 with a steel wire wool structure plays a buffering role, reduces the impact force when the valve cover 402 is closed, reduces the impact sound of the valve cover 402 on the valve body 401, and improves the durability of the structure of the valve 4.

[0030] The valve 4 reduces the flow rate of the airflow entering the muffler, thereby greatly reducing the noise generated by the friction between the airflow and the pipeline of the sound attenuation mechanism in the muffler. After the airflow speed is reduced, the sound energy entering the muffler is correspondingly reduced, and the required volume for interference cancellation is also correspondingly reduced, thereby the volume of the muffler can be reduced, which is beneficial to the overall layout of the vehicle.

[0031] As Figure 2 and Figure 3As shown, the shell assembly 2 comprises an outer shell, the two ends of the outer shell are respectively sealed and fixedly connected with the sealing side plates 201, and the inner part of the outer shell is sealed and fixedly connected with the first partition plate 202, the second partition plate 203 and the third partition plate 204 which are arranged at intervals. Among them, the first partition plate 202 and the sealing side plate 201 at one end form a first chamber 207, and the air inlet pipe 1 is communicated with the first chamber 207; the first partition plate 202 and the second partition plate 203 form a second chamber 208, the second partition plate 203 and the third partition plate 204 form a third chamber 209, and the third partition plate 204 and the sealing side plate 201 at the other end form a fourth chamber 210, that is, the first chamber 207, the second chamber 208, the third chamber 209 and the fourth chamber 210 are sequentially arranged in the shell assembly 2, and these chambers are independent and sealed, forming multiple spaces of different sizes for step-by-step noise reduction of exhaust gas. The size and shape of different chambers can be adjusted as needed to achieve the best noise reduction effect.

[0032] In this embodiment, the noise reduction mechanism comprises a first noise reduction pipe 5, a second noise reduction pipe 6 and a third noise reduction pipe 7, the first noise reduction pipe 5 is sealed and penetrates the first partition plate 202, the second partition plate 203 and the third partition plate 204, that is, the air inlet end of the first noise reduction pipe 5 is communicated with the first chamber 207, and the air outlet end of the first noise reduction pipe 5 is communicated with the fourth chamber 210; the second noise reduction pipe 6 is sealed and penetrates the second partition plate 203 and the third partition plate 204, that is, the air inlet end of the second noise reduction pipe 6 is communicated with the fourth chamber 210, and the air outlet end of the second noise reduction pipe 6 is communicated with the second chamber 208; the third noise reduction pipe 7 is sealed and penetrates the second partition plate 203 and the third partition plate 204, and the air outlet end of the third noise reduction pipe 7 is communicated with the air outlet pipe 3, that is, the air inlet end of the third noise reduction pipe 7 is communicated with the second chamber 208. By extending the exhaust path through multiple noise reduction pipes, the airflow will continuously reflect and interfere in each chamber, and the energy of the exhaust noise will be gradually absorbed and consumed, thereby reducing the exhaust noise.

[0033] To further improve the noise reduction capability, a plurality of sound reduction holes one 204 are formed on the first noise reduction pipe 5 and the second noise reduction pipe 6 in the third chamber 209 respectively,

[0034] The second partition plate 203 and the third partition plate 204 on both sides of the third chamber 209 are respectively provided with sound reduction holes two 205. The sound reduction holes one and the sound reduction holes two 205 help to disperse the passing airflow, thereby changing the propagation path of the sound wave, making the high-speed flowing exhaust gas relatively stable, and the number of reflection and refraction of the sound wave in the muffler is increased. In this way, the distance of the sound wave propagation in the muffler is increased, and the energy is further consumed in the propagation process, so that the noise is also reduced.

[0035] The outer side wall of the shell assembly 2 is fixedly connected with a support plate 206 on the side away from the valve body 401, and the support plate 206 is fixedly connected with the first partition plate 202 and the sealing side plate 201 in the shell assembly 2. The support plate 206 increases the support strength of the air inlet pipe 1, preventing the tail end of the air inlet pipe 1 from being too heavy and causing pipeline rupture after the valve 4 is added.

[0036] Working principle:

[0037] In use, the exhaust gas discharged by the automobile engine first enters the utility model through the air inlet pipe 1. When the exhaust gas pressure is low, the valve cover 402 is in a closed state under the elastic force of the elastic assembly 404 (torsional spring), and the exhaust gas can enter the first chamber 207 through the air outlet hole 101 on the inner wall of the shell assembly 2. The air outlet hole 101 allows the exhaust gas to be preliminarily dispersed when entering the first chamber 207, reducing the speed and pressure of the airflow and preparing for subsequent sound attenuation treatment.

[0038] With the increase of the load of the automobile engine, the exhaust gas pressure gradually increases. When the exhaust gas pressure reaches a certain value, the impact force of the exhaust gas on the valve cover 402 overcomes the elastic force of the elastic assembly 404, and the valve cover 402 rotates around the rotating shaft 403 to open, and part of the exhaust gas directly enters the first chamber 207 through the valve 4. At this time, the valve 4 plays a role in automatically adjusting the airflow according to the exhaust gas pressure, reducing the flow rate of the airflow entering the muffler, thereby reducing the noise generated by the friction between the airflow and the sound attenuation pipe. At this time, the airflow speed is reduced, the sound energy entering the muffler is correspondingly reduced, and the volume required for the airflow to interfere and cancel is also correspondingly reduced. Therefore, the automobile exhaust muffler is smaller and more compact under the premise of ensuring good noise reduction and sound attenuation, which is beneficial to the overall layout of the vehicle.

[0039] After the exhaust gas enters the first chamber 207, the airflow speed is further reduced due to the sudden increase in the space of the chamber, and part of the sound energy is consumed. Then, the exhaust gas enters the fourth chamber 210 through the first sound attenuation pipe 5, and under the action of the sound attenuation hole one on the first sound attenuation pipe 5, the sound waves in the exhaust gas are reflected, interfered, etc., and part of the sound energy is absorbed. Next, the exhaust gas enters the second sound attenuation pipe 6 from the fourth chamber 210, and then enters the second chamber 208 through the second sound attenuation pipe 6. Similarly, under the action of the sound attenuation hole one on the second sound attenuation pipe 6 and the second chamber 208, the sound energy continues to be consumed. The sound attenuation holes two 205 on both sides of the third chamber 209 also play a further sound attenuation role on the sound waves in the exhaust gas. Finally, the exhaust gas enters the air outlet pipe 3 through the third sound attenuation pipe 7 and is discharged. In this process, through this series of sound attenuation processes, the noise of the exhaust gas is significantly reduced.

[0040] Finally, although the present specification is described in terms of embodiments, not every embodiment exhibits every characteristic or implements every combination of features described in the present specification. The present specification has been described in a manner that is thorough and complete to one skilled in the art and the specification is intended to be construed as an exemplification of one or more embodiments rather than as an exhaustive list of embodiments.

Claims

1. A vehicle exhaust silencer, comprising a housing assembly (2) in which a silencing mechanism is arranged, the housing assembly (2) being provided with an air inlet pipe (1) communicating with an air inlet of the silencing mechanism and an air outlet pipe (3) communicating with an air outlet of the silencing mechanism, characterized in that: The one end of the air inlet pipe (1) extending into the shell assembly (2) is provided with a valve (4), the valve (4) comprises a valve body (401), the valve body (401) is sealingly and fixedly connected with the air inlet pipe (1), a valve cover (402) is rotatably connected to the upper portion of the valve body (401), and an elastic assembly (404) is arranged between the valve cover (402) and the valve body (401).

2. The automotive exhaust silencer according to claim 1, wherein: The two sides of the upper portion of the valve body (401) are respectively fixedly connected with an ear plate one, a rotating shaft (403) is arranged between the two ear plate ones, an ear plate two corresponding to the ear plate one is fixedly connected to the valve cover (402), the ear plate two is rotatably connected with the rotating shaft (403), the elastic assembly (404) is a torsion spring, the elastic assembly (404) is sleeved on the rotating shaft (403), one end of the elastic assembly (404) abuts against the valve cover (402), and the other end of the elastic assembly (404) abuts against the valve body (401).

3. An automotive exhaust silencer as claimed in claim 2, wherein: The inner end face of the valve body (401) matched with the valve cover (402) is fixedly connected with a buffer washer (405).

4. The automotive exhaust muffler according to claim 3, wherein: The buffer washer (405) is made of stainless steel wire wool.

5. The automotive exhaust muffler of claim 1, wherein: A plurality of air outlet holes (101) are formed in the pipe wall of the air inlet pipe (1) located in the shell assembly (2).

6. The automotive exhaust muffler of claim 1, wherein: A supporting plate (206) is fixedly connected to the outer side wall of the air inlet pipe (1) located in the shell assembly (2) and away from the valve body (401), and the supporting plate (206) is fixedly connected with the shell assembly (2).

7. An automotive exhaust silencer according to any one of claims 1 to 6, characterized in that: The shell assembly (2) is sequentially and sealingly provided with a first chamber (207), a second chamber (208), a third chamber (209) and a fourth chamber (210), and the air inlet pipe (1) is communicated with the first chamber (207); the sound attenuation mechanism comprises a first sound attenuation pipe (5), a second sound attenuation pipe (6) and a third sound attenuation pipe (7), the air inlet end of the first sound attenuation pipe (5) is communicated with the first chamber (207), the air outlet end of the first sound attenuation pipe (5) is communicated with the fourth chamber (210), the air inlet end of the second sound attenuation pipe (6) is communicated with the fourth chamber (210), the air outlet end of the second sound attenuation pipe (6) is communicated with the second chamber (208), the air inlet end of the third sound attenuation pipe (7) is communicated with the second chamber (208), and the air outlet end of the third sound attenuation pipe (7) is communicated with the air outlet pipe (3).

8. The automotive exhaust silencer of claim 7, wherein: A plurality of sound attenuation holes one are formed in the first sound attenuation pipe (5) and the second sound attenuation pipe (6) located in the third chamber (209).

9. An automotive exhaust silencer according to claim 8, characterised in that: Sound attenuation holes two (205) are formed in the sealing partitions on the two sides of the third chamber (209).

Images