Multi-gradient sound absorption structure of engine silencer

Abstract

The utility model relates to the technical field of engine silencing, in particular to a multi-gradient sound absorption structure of an engine silencer, which comprises a silencing box, a first silencing bin, a second silencing bin, a third silencing bin, a fourth silencing bin and a fifth silencing bin are arranged in the silencing box, one end of the silencing box is provided with a connecting pipe, and the connecting pipe is connected with the second silencing bin; the open end of the silencing pipe is located in the first silencing bin, a discharge pipe is arranged below the silencing pipe, one end of the discharge pipe is located in the fifth silencing bin, and the other end of the discharge pipe is located outside the silencing box; the multi-gradient noise reduction device has the beneficial effects that the connecting pipe at one end of the noise reduction box can be connected with an engine, sound is transmitted into the noise reduction box through the connecting pipe and then transmitted into the first noise reduction bin, the third noise reduction bin, the fourth noise reduction bin and the fifth noise reduction bin through the second noise reduction bin, the sound transmitted into the noise reduction bins can interact and form an interference effect, multi-gradient noise reduction is achieved, and the noise reduction effect is good. And the sound subjected to multi-stage sound attenuation treatment is discharged to the outside through a discharge pipe of the fifth sound attenuation bin.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of engine silencer, concretely to a multi-gradient sound absorption structure of engine silencer. BACKGROUND

[0002] The main function of the engine silencer is to reduce the noise generated when the engine is running, effectively attenuate the exhaust noise and mechanical vibration sound through the multi-stage sound attenuation structure and sound absorption material, which not only can improve the driving comfort, but also can reduce the noise pollution to the surrounding environment, meet the environmental protection requirements, and the engine is connected with the silencer, and the silencer is provided with a silencing component to realize silencing.

[0003] In the prior art, the traditional engine silencer is mainly composed of a shell, an air inlet pipe, an exhaust pipe and sound absorption material, wherein the shell is used for packaging the whole structure, the air inlet pipe is responsible for guiding the exhaust gas and noise into the interior of the silencer, the exhaust pipe is used for discharging the treated gas, and the sound absorption material is mainly used for absorbing part of the sound wave energy, and the components cooperate to realize the silencing effect.

[0004] However, the traditional engine silencer has a simple internal structure, and the sound only undergoes a single or limited reflection and absorption process in the silencer, lacks a multi-stage noise reduction design, and high-frequency or low-frequency noise is difficult to effectively eliminate, so the silencing effect is poor, and therefore the utility model provides a multi-gradient sound absorption structure of engine silencer to solve the above problems. SUMMARY

[0005] The utility model aims at providing a multi-gradient sound absorption structure of engine silencer to solve the problems in the background art.

[0006] In order to achieve the above object, the utility model provides the following technical scheme: a multi-gradient sound absorption structure of engine silencer, comprising: a silencing box, a first silencing chamber, a second silencing chamber, a third silencing chamber, a fourth silencing chamber and a fifth silencing chamber are arranged in the silencing box, a connecting pipe is installed at one end of the silencing box, and the connecting pipe is connected with the second silencing chamber.

[0007] The silencing pipe is arranged below the silencing pipe, and the exhaust pipe is arranged in the fifth silencing chamber.

[0008] Preferably, the silencing box is in the form of a cuboid, and a hole is formed in the side surface of the silencing box, the inner wall of the hole is fixedly connected with the outer wall of one end of the connecting pipe, and the connecting pipe is connected with the interior of the second silencing chamber.

[0009] Preferably, the first sound insulation plate is arranged between the first sound attenuation chamber and the second sound attenuation chamber, the surface of the first sound insulation plate is provided with two groups of holes in an upper-lower symmetrical structure, a sound attenuation pipe is fixedly installed in the upper end hole, and a discharge pipe is fixedly installed in the lower end hole.

[0010] Preferably, the second sound insulation plate is arranged between the second sound attenuation chamber and the third sound attenuation chamber, the third sound insulation plate is arranged between the third sound attenuation chamber and the fourth sound attenuation chamber, the fourth sound insulation plate is arranged between the fourth sound attenuation chamber and the fifth sound attenuation chamber, the surfaces of the second sound insulation plate, the third sound insulation plate and the fourth sound insulation plate are all provided with two groups of holes in an upper-lower symmetrical structure, sound attenuation pipes and discharge pipes are respectively fixedly installed in the two groups of holes, and conveying holes are formed in the surfaces of the second sound insulation plate, the third sound insulation plate and the fourth sound insulation plate.

[0011] Preferably, the fifth sound attenuation chamber is provided with a sound attenuation baffle, the sound attenuation baffle has a multilayer bending structure as a whole, and the sound attenuation baffle is located in front of one end of the discharge pipe.

[0012] Preferably, one end of the sound attenuation pipe is located in the first sound attenuation chamber, the surface of the sound attenuation pipe located in the third sound attenuation chamber is provided with a plurality of sound holes, the outer walls of the sound holes are covered with sound attenuation cotton sleeves, the other end of the sound attenuation pipe penetrates through the sound attenuation box shell and is located outside the sound attenuation box, and a sealing block is fixedly installed on the sound attenuation pipe located outside.

[0013] Preferably, one end of the discharge pipe is located in the fifth sound attenuation chamber, the outer wall of the discharge pipe located at the third sound attenuation chamber end is also provided with a plurality of sound holes, the outer walls of the sound holes are covered with sound attenuation cotton sleeves, and the other end of the discharge pipe penetrates through the sound attenuation box shell and is located outside the sound attenuation box.

[0014] Compared with the prior art, the engine sound attenuation device with a multi-gradient sound absorption structure has the advantages that:

[0015] The engine sound attenuation device with a multi-gradient sound absorption structure has the advantages that: BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 The utility model discloses a structure schematic diagram;

[0017] Fig. 2 It is the internal structure schematic view of the utility model structure;

[0018] Fig. 3 It is the sound hole structure schematic view of the utility model structure;

[0019] Fig. 4 It is the internal structure side surface structure schematic view of the utility model structure.

[0020] In the drawing: 1, sound box;2, first sound absorbing chamber;3, second sound absorbing chamber;4, third sound absorbing chamber;5, fourth sound absorbing chamber;6, fifth sound absorbing chamber;7, connecting pipe;8, sound absorbing pipe;9, discharge pipe;10, first sound insulation board;11, communication hole;12, second sound insulation board;13, third sound insulation board;14, fourth sound insulation board;15, conveying hole;16, sound absorbing baffle;17, sound hole;18, sound absorbing cotton cover. Specific implementation

[0021] In order to make the utility model purposes, technical scheme clear, complete description, and the advantage is more clear and clear, the following combining the drawing to the utility model embodiment further detailed explanation.Should understand, the specific embodiment described here is a part of the embodiment of the utility model, rather than all the embodiment, just to explain the embodiment of the utility model, and not for the limitation of the embodiment of the utility model, all other embodiments obtained by the ordinary skill in the art without doing the premise of the creative labor, belong to the scope of the protection of the utility model.

[0022] Embodiment one: please refer to Figs. 1 to 4 The utility model provides a kind of technical scheme: a multi-gradient sound absorption structure of engine muffler, comprising: sound box 1, first sound absorbing chamber 2, second sound absorbing chamber 3, third sound absorbing chamber 4, fourth sound absorbing chamber 5 and fifth sound absorbing chamber 6 are set in sound box 1, and the one end of sound box 1 is equipped with connecting pipe 7, and connecting pipe 7 is connected with second sound absorbing chamber 3;

[0023] Sound absorbing pipe 8, the open one end of sound absorbing pipe 8 is located in first sound absorbing chamber 2, and discharge pipe 9 is arranged below sound absorbing pipe 8, and the one end of discharge pipe 9 is located in fifth sound absorbing chamber 6, and the other end of discharge pipe 9 is located outside sound box 1;

[0024] In use, the connecting pipe 7 at one end of the sound attenuation box 1 is connected with the engine, sound is transmitted into the sound attenuation box 1 through the connecting pipe 7, sound is transmitted into the second sound attenuation chamber 3 through the connecting pipe 7, and the sound is transmitted into the first sound attenuation chamber 2, the third sound attenuation chamber 4, the fourth sound attenuation chamber 5 and the fifth sound attenuation chamber 6 through the second sound attenuation chamber 3 respectively, the sound transmitted into the first sound attenuation chamber 2 is transmitted into the sound attenuation pipe 8 for sound attenuation, the sound transmitted into other sound attenuation chambers interacts and forms interference effect, thereby effectively reducing the sound wave energy, further realizing the sound attenuation effect, finally, the sound after the multi-stage sound attenuation treatment is discharged to the outside through the discharge pipe 9 of the fifth sound attenuation chamber 6, thereby realizing the purpose of multi-gradient sound absorption and high-efficiency noise reduction, which avoids the problems of unobvious sound attenuation and serious noise pollution caused by single sound attenuation structure.

[0025] In order to realize multi-gradient sound attenuation, the first sound attenuation chamber 2 is arranged on the basis of the embodiment one, the first sound insulation plate 10 is arranged between the first sound attenuation chamber 2 and the second sound attenuation chamber 3, two groups of holes in an upper-lower symmetrical structure are arranged on the surface of the first sound insulation plate 10, the sound attenuation pipe 8 is fixedly installed in the upper-end hole, the discharge pipe 9 is fixedly installed in the lower-end hole, the communication hole 11 is arranged on the surface of the first sound insulation plate 10 away from the connecting pipe 7, the second sound insulation plate 12 is arranged between the second sound attenuation chamber 3 and the third sound attenuation chamber 4, the third sound insulation plate 13 is arranged between the third sound attenuation chamber 4 and the fourth sound attenuation chamber 5, the fourth sound insulation plate 14 is arranged between the fourth sound attenuation chamber 5 and the fifth sound attenuation chamber 6, two groups of holes in an upper-lower symmetrical structure are arranged on the surface of the second sound insulation plate 12, the third sound insulation plate 13 and the fourth sound insulation plate 14, the sound attenuation pipe 8 and the discharge pipe 9 are fixedly installed in the two groups of holes respectively, and the transmission hole 15 is arranged on the surface of the second sound insulation plate 12, the third sound insulation plate 13 and the fourth sound insulation plate 14.

[0026] In order to realize multi-gradient sound attenuation, the first sound attenuation chamber 2 is arranged on the basis of the embodiment one, the first sound insulation plate 10 is arranged between the first sound attenuation chamber 2 and the second sound attenuation chamber 3, two groups of holes in an upper-lower symmetrical structure are arranged on the surface of the first sound insulation plate 10, the sound attenuation pipe 8 is fixedly installed in the upper-end hole, the discharge pipe 9 is fixedly installed in the lower-end hole, the communication hole 11 is arranged on the surface of the first sound insulation plate 10 away from the connecting pipe 7, the second sound insulation plate 12 is arranged between the second sound attenuation chamber 3 and the third sound attenuation chamber 4, the third sound insulation plate 13 is arranged between the third sound attenuation chamber 4 and the fourth sound attenuation chamber 5, the fourth sound insulation plate 14 is arranged between the fourth sound attenuation chamber 5 and the fifth sound attenuation chamber 6, two groups of holes in an upper-lower symmetrical structure are arranged on the surface of the second sound insulation plate 12, the third sound insulation plate 13 and the fourth sound insulation plate 14, the sound attenuation pipe 8 and the discharge pipe 9 are fixedly installed in the two groups of holes respectively, and the transmission hole 15 is arranged on the surface of the second sound insulation plate 12, the third sound insulation plate 13 and the fourth sound insulation plate 14.

[0027] The sound attenuation baffle 16 is arranged in the fifth sound attenuation chamber 6, the sound attenuation baffle 16 has a multi-layer bending structure as a whole, and the sound attenuation baffle 16 is located in front of one end of the discharge pipe 9 as a whole; one end of the discharge pipe 9 is arranged in the fifth sound attenuation chamber 6, the outer wall of the discharge pipe 9 at the third sound attenuation chamber 4 end is also provided with a plurality of sound attenuation holes 7, the sound attenuation holes 7 are covered with sound attenuation cotton sleeves 8, and the other end of the discharge pipe 9 penetrates through the sound attenuation box shell and is arranged outside the sound attenuation box.

[0028] The sound-absorbing baffle 16 is located in front of the exhaust pipe 9 of the fifth sound-absorbing chamber 6, and the sound-absorbing baffle 16 is a multi-layer bending structure. When the sound enters the fifth sound-absorbing chamber 6 through the transmission holes 15 on both sides of the fourth sound-insulating plate 14, the sound-absorbing baffle 16 is made of sound-absorbing material. The sound is reflected, refracted and absorbed by the sound-absorbing baffle 16 again. The sound wave is gradually attenuated when it passes through the sound-absorbing baffle 16 due to multiple impacts on the bending surface, and is further absorbed by the sound-absorbing material, thereby reducing the noise intensity. Finally, the sound is discharged from the exhaust pipe 9, thereby achieving further sound absorption and significantly improving the overall sound-absorbing effect.

[0029] In order to improve the overall sound-absorbing effect, the sound-absorbing pipe 8 is arranged in the first sound-absorbing chamber 2 in embodiment two. The sound-absorbing pipe 8 is arranged on the surface of the third sound-absorbing chamber 4 and is provided with a plurality of sound-absorbing holes 7. The sound-absorbing holes 7 are covered with sound-absorbing cotton sleeves 8. The other end of the sound-absorbing pipe 8 penetrates through the sound-absorbing box shell and is arranged outside the sound-absorbing box. The sound-absorbing pipe 8 is fixedly installed with a sealing block at the outside end.

[0030] In order to better absorb sound, the sound-absorbing pipe 8 arranged in the third sound-absorbing chamber 4 is provided with sound-absorbing holes 17 on the outer wall of the exhaust pipe 9. The sound-absorbing holes 17 are covered with sound-absorbing cotton sleeves 18 on the outside. When the sound enters the sound-absorbing pipe 8 from the first sound-absorbing chamber 2, it is partially released to the outside environment through the sound-absorbing holes 17, and is further absorbed and weakened by the sound-absorbing cotton sleeves 18 outside, thereby reducing the spread of noise. The remaining sound after processing is discharged back into the sound-absorbing chamber, interferes with other sound waves, and is further attenuated, thereby achieving better sound-absorbing effect.

[0031] Working principle: in actual use, the connecting pipe 7 at one end of the sound-absorbing box 1 is connected with the engine. The sound is transmitted into the sound-absorbing box 1 through the connecting pipe 7. The sound is transmitted into the second sound-absorbing chamber 3 through the connecting pipe 7. The sound is transmitted into the first sound-absorbing chamber, the third sound-absorbing chamber 4, the fourth sound-absorbing chamber 5 and the fifth sound-absorbing chamber 6 from the second sound-absorbing chamber 3. The sound transmitted into the first sound-absorbing chamber is transmitted into the sound-absorbing pipe 8 for sound absorption. The sound transmitted into other sound-absorbing chambers interacts and forms interference effect, thereby effectively reducing the sound wave energy and further achieving sound-absorbing effect. Finally, the sound after multi-stage sound-absorbing treatment is discharged to the outside through the exhaust pipe 9 of the fifth sound-absorbing chamber 6, thereby achieving the purposes of multi-gradient sound absorption and high-efficiency noise reduction. In this way, the problem of obvious sound-absorbing effect and serious noise pollution caused by single sound-absorbing structure is avoided.

[0032] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-gradient sound absorbing structure for an engine muffler, comprising: The silencing box (1) is provided with a first silencing chamber (2), a second silencing chamber (3), a third silencing chamber (4), a fourth silencing chamber (5) and a fifth silencing chamber (6), characterized in that: a connecting pipe (7) is installed at one end of the silencing box (1), and the connecting pipe (7) is connected to the second silencing chamber (3); The silencer (8) has one end of its opening located inside the first silencer chamber (2). A discharge pipe (9) is provided below the silencer (8). One end of the discharge pipe (9) is located inside the fifth silencer chamber (6), and the other end of the discharge pipe (9) is located outside the silencer box (1).

2. The multi-gradient sound absorption structure of an engine silencer according to claim 1, characterized in that: The silencing box (1) is a rectangular parallelepiped structure. A hole is provided on the side of the silencing box (1). The inner wall of the hole is fixedly connected to the outer wall of one end of the connecting pipe (7). The connecting pipe (7) is connected to the inside of the second silencing chamber (3).

3. The multi-gradient sound absorption structure of an engine silencer according to claim 1, characterized in that: A first sound insulation plate (10) is provided between the first sound insulation chamber (2) and the second sound insulation chamber (3). The surface of the first sound insulation plate (10) has two sets of holes with an upper and lower symmetrical structure. A sound insulation pipe (8) is fixedly installed in the upper hole, and a discharge pipe (9) is fixedly installed in the lower hole. A connecting hole (11) is provided on the surface of the first sound insulation plate (10) away from the connecting pipe (7).

4. The multi-gradient sound absorption structure of an engine silencer according to claim 1, characterized in that: A second soundproof plate (12) is provided between the second soundproof chamber (3) and the third soundproof chamber (4), a third soundproof plate (13) is provided between the third soundproof chamber (4) and the fourth soundproof chamber (5), and a fourth soundproof plate (14) is provided between the fourth soundproof chamber (5) and the fifth soundproof chamber (6). The surfaces of the second soundproof plate (12), the third soundproof plate (13) and the fourth soundproof plate (14) are provided with two sets of holes that are symmetrically arranged vertically. A soundproof pipe (8) and a discharge pipe (9) are fixedly installed in the two sets of holes respectively. Conveying holes (15) are provided at both ends of the surfaces of the second soundproof plate (12), the third soundproof plate (13) and the fourth soundproof plate (14).

5. The multi-gradient sound absorbing structure of an engine muffler according to claim 1, characterized in that: The fifth silencing chamber (6) is equipped with a silencing baffle (16). The silencing baffle (16) has a multi-layered bent structure and is located directly in front of one end of the discharge pipe (9).

6. The multi-gradient sound absorbing structure of an engine silencer according to claim 1, characterized in that: One end of the silencing pipe (8) is located inside the first silencing chamber (2). Several silencing holes (17) are opened on the surface of the third silencing chamber (4). The outer wall of the silencing holes (17) is covered with a silencing cotton sleeve (18). The other end of the silencing pipe (8) passes through the outer shell of the silencing box (1) and is located outside one end of the silencing box (1). A sealing block is fixedly installed on the outer end of the silencing pipe (8).

7. The multi-gradient sound absorbing structure of an engine silencer according to claim 1, characterized in that: One end of the discharge pipe (9) is placed inside the fifth silencing chamber (6). Several silencing holes (17) are also opened on the outer wall of the third silencing chamber (4). The outer wall of the silencing holes (17) is covered with a silencing cotton sleeve (18). The other end of the discharge pipe (9) passes through the outer shell of the silencing box (1) and is placed outside the silencing box (1).

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