Microporous composite automobile silencer

Abstract

The utility model relates to the field of automobile silencers, in particular to a micropore composite automobile silencer which comprises a silencing box, an air inlet pipe, an exhaust pipe and wavy baffles, and the wavy baffles are fixed inside the silencing box at intervals and divide an inner cavity into a first cavity, a second cavity, a third cavity and a fourth cavity. First micropores are formed in the portion, connected with the left end of the silencing box and located in the silencing box, of the air inlet pipe at intervals, the right end of the air inlet pipe communicates with the third cavity, the third cavity communicates with the first cavity through a second guide pipe, second micropores are evenly distributed in the second guide pipe, the first cavity communicates with the fourth cavity through a third guide pipe, and the fourth cavity communicates with the third guide pipe. And third micropores are evenly distributed in the third guide pipe, the exhaust pipe is connected with the right end of the silencing box, the part, located in the silencing box, of the exhaust pipe is S-shaped, the left end of the exhaust pipe is connected with the third guide pipe, the four cavities are provided with sound-absorbing cotton surrounding the outer portion of the S-shaped exhaust pipe, the strength of high-frequency noise is greatly reduced, and meanwhile it is guaranteed that the performance of the sound-absorbing cotton is stable.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of automobile muffler relates to a microporous composite automobile muffler. BACKGROUND

[0002] The automobile muffler is the important part of reducing the exhaust noise of automobile engine. The traditional automobile muffler adopts the resistance sound elimination, the resistance sound elimination or the way of combination. The resistance sound eliminator changes the section area, shape etc. of exhaust passage, utilizes the reflection, interference etc. of sound wave to reduce the noise, but the elimination effect of high frequency noise is poor. The resistance sound eliminator relies on sound absorption material such as sound absorption cotton to convert sound energy into heat energy to reduce the noise, but in actual use, the water vapor produced by engine combustion condenses into water in the muffler, is discharged from the micropore of the internal pipeline of the muffler, and the sound absorption material is easily affected by the performance due to the problem of damp.

[0003] In order to solve the problems in the prior art, a microporous composite automobile muffler with simple structure and good sound elimination effect needs to be designed. INVENTION CONTENTS

[0004] The utility model discloses a kind of microporous composite automobile mufflers to solve the problems of prior art.

[0005] The utility model discloses a kind of microporous composite automobile muffler, including: sound box, air inlet pipe, exhaust pipe and wave baffle, the wave baffle is fixedly spaced in sound box interior and the inner cavity is divided into one chamber, two chambers, three chambers and four chambers, the part on the left end of sound box and located in sound box interior of air inlet pipe is spaced and provided with micropore one, the right end of air inlet pipe is communicated to three chambers, three chambers and one chamber are interconnected by conduit two, the micropore two is uniformly distributed on conduit two, one chamber and four chambers are interconnected by conduit three, the micropore three is uniformly distributed on conduit three, the part of exhaust pipe that is connected to the right end of sound box and located in sound box interior is S-shaped, the left end of exhaust pipe is connected with conduit three setting, four chambers are provided with sound absorption cotton that is enclosed in the outside of S-shaped exhaust pipe part.

[0006] Further improvement, the wave baffle includes baffle one, baffle two and baffle three, the inside of sound box is sequentially divided into one chamber, two chambers, three chambers and four chambers by baffle one, baffle two and baffle three, the both sides of baffle one and baffle two are arranged in wave-shaped cross section, the left side of baffle three is arranged in wave-shaped cross section, the right side of baffle three is arranged in plane.

[0007] Further improvement, baffle four and baffle five are further arranged between baffle one and baffle two, baffle four is located between conduit two and conduit three, baffle five is located between conduit three and the right end of air inlet pipe.

[0008] Further improvement, the right end of the intake pipe is symmetrically arranged with two pipes, and the third pipe is arranged in the middle of the muffler.

[0009] Further improvement, the right end of the exhaust pipe is arranged downwardly.

[0010] Compared with the prior art, the micro-porous composite automobile muffler has the beneficial effects that:

[0011] In the first, second and third chambers, sound waves continuously impact the wave-shaped baffles on both sides, the wave-shaped structure of the baffles greatly increases the reflection angle and reflection path length of the sound waves, promotes multiple reflections and mutual interference of the sound waves, and effectively weakens the noise energy; the fourth chamber is designed to be airtight, and the S-shaped exhaust pipe part is not provided with micro-holes, which can prevent the internal sound-absorbing cotton from being damp, ensure the stable performance of the sound-absorbing cotton, and the S-shaped exhaust pipe part not only significantly prolongs the exhaust gas running path, but also cooperates with the sound-absorbing cotton surrounding it; when the exhaust gas flows in the S-shaped pipe, the sound waves are efficiently absorbed by the sound-absorbing cotton and converted into heat energy to dissipate, further reducing the noise intensity.

[0012] Through numerous reflection surfaces and complex propagation paths, high-frequency noise has more opportunities to interact with the structure surface, and the energy is fully consumed, thereby greatly reducing the intensity of high-frequency noise and significantly improving the noise reduction performance of the muffler. BRIEF DESCRIPTION OF DRAWINGS

[0013] Fig. 1 is a structural schematic view of the utility model

[0014] Fig. 2 is a structural schematic view of airflow running of the utility model

[0015] Fig. 3 is a structural schematic view of sound wave transmission in the utility model

[0016] In the drawing, 1 is a muffler, 11 is a first chamber, 12 is a second chamber, 13 is a third chamber, 14 is a fourth chamber, 2 is an intake pipe, 21 is a micro-hole one, 3 is an exhaust pipe, 31 is an S-shaped exhaust pipe part, 4 is a wave-shaped baffle, 41 is a baffle one, 42 is a baffle two, 43 is a baffle three, 44 is a baffle four, 45 is a baffle five, 5 is a pipe two, 51 is a micro-hole two, 6 is a pipe three, 61 is a micro-hole three, and 7 is sound-absorbing cotton. DETAILED DESCRIPTION

[0017] In the description of the utility model, it is necessary to explain that the orientation or position relation indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is the orientation or position relation based on the orientation or position relation shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as a limitation on the utility model; unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixed connection, or it can be detachable connection, etc. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0018] The utility model is further described below in combination with the embodiments and drawings. Figs. 1-3 The technical scheme of the utility model is further described.

[0019] Embodiment 1

[0020] A kind of microporous composite automobile muffler, comprising: muffler box 1, air inlet pipe 2, exhaust pipe 3 and wave baffle 4, the wave baffle 4 is fixedly spaced in muffler box 1 inside and will inner cavity be divided into one chamber 11, two chambers 12, three chambers 13 and four chambers 14, the air inlet pipe 2 is connected muffler box 1 left end and the part in muffler box 1 inside is spaced and provided with micropore one 21, the right end of the air inlet pipe 2 is communicated to three chambers 13, three chambers 13 and one chamber 11 are interconnected by conduit two 5, the conduit two 5 is uniformly distributed with micropore two 51, one chamber 11 and four chambers 14 are interconnected by conduit three 6, the conduit three 6 is uniformly distributed with micropore three 61, the exhaust pipe 3 is connected muffler box 1 right end and the part in muffler box 1 inside is S-shaped, the left end of the exhaust pipe 3 is connected conduit three 6 setting, four chambers 14 are provided with sound-absorbing cotton 7 enclosed in S-shaped exhaust pipe portion 31 outside.

[0021] As Figs. 1-3 The utility model uses the principle as shown in the figure:

[0022] Under the action of air pressure, exhaust gas enters the muffler box through the air inlet pipe, although the micropore one in its interior exists, but will not interfere with the overall operation path of exhaust gas. Exhaust gas proceeds in order, smoothly enters three chambers from the air inlet pipe. Subsequently, the exhaust gas in three chambers is driven by air pressure, flows stably into one chamber through the conduit two with uniformly distributed micropore two. The exhaust gas in one chamber further enters the S-shaped exhaust pipe portion of four chambers through the conduit three with micropore three, and is finally discharged from the exhaust pipe.

[0023] In this process, the noise propagation path is different from the exhaust gas. The noise first disperses into the first and second chambers through the micro hole one at the right end of the intake pipe. At the same time, the noise also penetrates into the second chamber through the micro hole two on the guide pipe two, and into the second and third chambers through the micro hole three of the guide pipe three. In the first, second and third chambers, the sound waves continuously hit the wave-shaped baffles on both sides. The wave-shaped structure of the baffles greatly increases the reflection angle and reflection path length of the sound waves, causing the sound waves to reflect multiple times and interfere with each other, effectively weakening the noise energy.

[0024] The four-chamber is designed to be airtight, and the S-shaped exhaust pipe part is not provided with a micro hole. This measure can prevent the internal sound-absorbing cotton from being damp, and ensure the stable performance of the sound-absorbing cotton. The four-chamber is essentially a Helmholtz chamber, and the S-shaped exhaust pipe part not only significantly prolongs the exhaust gas running path, but also cooperates with the sound-absorbing cotton surrounding it. When the exhaust gas flows in the S-shaped pipe, the sound waves are efficiently absorbed by the sound-absorbing cotton and converted into heat energy to dissipate, further reducing the noise intensity.

[0025] In summary, by skillfully designing the diversion path of exhaust gas and noise, using wave-shaped baffles to enhance sound wave interference, and constructing airtight four-chamber with sound-absorbing cotton sound-absorbing structure, compared with traditional resistive silencers, through numerous reflection surfaces and complex propagation paths, high-frequency noise has more opportunities to interact with the structure surface, and the energy is fully consumed, thereby greatly reducing the intensity of high-frequency noise and significantly improving the silencing performance of the silencer.

[0026] As a further preferred embodiment, the wave-shaped baffle 4 includes baffle one 41, baffle two 42 and baffle three 43, which sequentially divide the inside of the silencer box 1 into a first chamber 11, a second chamber 12, a third chamber 13 and a fourth chamber 14. The baffle one 41 and the baffle two 42 are arranged in a wave-shaped cross section on both sides, the left side of the baffle three 43 is arranged in a wave-shaped cross section, and the right side of the baffle three 43 is arranged in a plane.

[0027] As a further preferred embodiment, the baffle one 41 and the baffle two 42 are further provided with baffle four 44 and baffle five 45 arranged up and down. The baffle four 44 is located between the guide pipe two 5 and the guide pipe three 6, and the baffle five 45 is located between the guide pipe three 6 and the right end of the intake pipe 2. The added baffle four and baffle five further subdivide the chamber space, making the flow and propagation trajectory in the silencer box, so that the exhaust gas and sound waves experience more reflections, refractions and interferences when passing through these complex chamber structures.

[0028] As a further preferred embodiment, the right end of the air inlet pipe 2 is symmetrically arranged with the conduit two 5, and the conduit three 6 is arranged in the middle of the muffler 1, so that the exhaust gas can be relatively uniformly distributed and flowed among the chambers after entering the muffler, and the sound waves can also be more evenly propagated and interfered among the chambers, avoiding the problem that the sound attenuation effect of some areas is poor due to uneven distribution of the airflow and the sound waves.

[0029] As a further preferred embodiment, the right end of the air inlet pipe 2 is symmetrically arranged with the conduit two 5, and the conduit three 6 is arranged in the middle of the muffler 1, so that the exhaust gas can be relatively uniformly distributed and flowed among the chambers after entering the muffler, and the sound waves can also be more evenly propagated and interfered among the chambers, avoiding the problem that the sound attenuation effect of some areas is poor due to uneven distribution of the airflow and the sound waves.

[0030] The preferred embodiments of the utility model are described in detail above. It should be understood that those skilled in the art can make many modifications and changes without creative labor according to the concept of the utility model. Therefore, any technical scheme obtained by logical analysis, reasoning or limited experiment on the basis of the prior art according to the concept of the utility model shall be within the protection scope defined by the claims.

Claims

1. A microporous composite automotive muffler, characterized in that, include: The system comprises a muffler, an intake pipe, an exhaust pipe, and a corrugated baffle. The corrugated baffle is fixed at intervals inside the muffler and divides the inner cavity into four chambers. The intake pipe is connected to the left end of the muffler and has micro-holes spaced apart on its portion inside the muffler. The right end of the intake pipe connects to the third chamber. The third chamber and the first chamber are interconnected by a second conduit, which has micro-holes evenly distributed on it. The first chamber and the fourth chamber are interconnected by a third conduit, which has micro-holes evenly distributed on it. The exhaust pipe is connected to the right end of the muffler and is S-shaped inside the muffler. The left end of the exhaust pipe is connected to the third conduit. The fourth chamber is equipped with sound-absorbing cotton surrounding the S-shaped exhaust pipe portion.

2. The microporous composite automotive muffler according to claim 1, characterized in that, The wave-shaped baffle includes baffle one, baffle two, and baffle three. The baffle one, baffle two, and baffle three divide the interior of the silencer box into a first chamber, a second chamber, a third chamber, and a fourth chamber in sequence. The sides of baffle one and baffle two are arranged with a wave-shaped cross section, the left side of baffle three is arranged with a wave-shaped cross section, and the right side of baffle three is arranged with a flat surface.

3. A microporous composite automotive muffler according to claim 2, characterized in that, Baffle 4 and Baffle 5 are also provided vertically between Baffle 1 and Baffle 2. Baffle 4 is located between duct 2 and duct 3, and Baffle 5 is located between duct 3 and the right end of the air intake pipe.

4. The microporous composite automotive muffler according to claim 1, characterized in that, The right end of the air intake pipe is symmetrically arranged with the second duct, and the third duct is located in the middle of the silencer box.

5. A microporous composite automotive muffler according to claim 1, characterized in that, The right end of the exhaust pipe is angled downwards.

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