Multi-stage noise reduction silencer for automobile exhaust system

Abstract

The utility model provides a multistage noise reduction muffler for an automobile exhaust system, which comprises a shell, an air inlet pipe, an air outlet pipe and a muffling pipe, a partition plate I, a partition plate II and a partition plate III are sequentially and fixedly mounted in the shell, a first muffling cavity is formed between the partition plate I and the shell, and a second muffling cavity is formed between the partition plate II and the shell. A second silencing cavity is formed among the second partition plate, the first partition plate and the shell, a third silencing cavity is formed among the third partition plate, the second partition plate and the shell, and a fourth silencing cavity is formed between the third partition plate and the shell. According to the integral arrangement, in the using process, carbon deposits in gas can be intercepted and filtered through the resistive noise reduction structure, blockage caused by the fact that the carbon deposits directly enter the interior of the shell is avoided, noise reduction and noise reduction can be conducted in cooperation with the internal structure of the shell, and the noise reduction effect is improved; and meanwhile, the resistive noise reduction structure can be independently disassembled, assembled, cleaned or replaced in the later period, and therefore the whole silencer is more convenient and flexible.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts, and in particular to a multi-stage noise reduction muffler for automotive exhaust systems. Background Technology

[0002] Multi-stage noise reduction mufflers are an important component of automotive exhaust systems. Their main function is to reduce and attenuate exhaust pressure pulsations through a multi-stage flow-splitting and pressure-dividing structure, thereby eliminating or reducing exhaust noise. These mufflers contain multiple silencing units, each employing a different silencing principle, working together to achieve optimal noise reduction.

[0003] However, existing automotive exhaust systems use multi-stage noise reduction mufflers, which typically fill the muffler cavity with sound-absorbing cotton. As we all know, when fuel is not completely burned, it enters the muffler and produces carbon deposits. Over time, these deposits accumulate on the sound-absorbing cotton, which not only easily causes blockages and affects exhaust, but also makes cleaning difficult.

[0004] Therefore, it is essential to invent a multi-stage noise reduction muffler for automotive exhaust systems. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a multi-stage noise reduction muffler for automotive exhaust systems. The technical solution adopted is as follows: A multi-stage noise reduction muffler for automotive exhaust systems includes a housing, an intake pipe, an exhaust pipe, and a muffler pipe, wherein: a first partition, a second partition, and a third partition are sequentially fixedly installed inside the housing; a first muffler cavity is formed between the first partition and the housing; a second muffler cavity is formed between the second partition, the first partition, and the housing; a third muffler cavity is formed between the third partition, the second partition, and the housing; and a fourth muffler cavity is formed between the third partition and the housing.

[0006] The third silencing chamber is connected to the fourth silencing chamber;

[0007] One end of the air intake pipe extends from one end of the housing into the housing and passes through the space between partition one and partition two for fixed connection; the air intake pipe is connected to the third silencer chamber.

[0008] One end of the vent pipe extends into the interior of the housing from the other end of the housing and passes through partition three and partition two, which are fixedly connected to partition one. The vent pipe is connected to the first silencing cavity.

[0009] The silencer pipe is fixedly installed between partition one and partition two, and the silencer pipe is arranged perpendicularly to partition one and partition two. The first silencer cavity and the third silencer cavity are connected through the silencer pipe.

[0010] The air inlet pipe and air outlet pipe are each detachably fixed with a resistive noise reduction structure via connectors.

[0011] The connector includes a first connecting pipe, a second connecting pipe, and a mounting hole. One end of the first connecting pipe is fixedly connected to the outer end of the corresponding air inlet pipe and air outlet pipe. The other end of the first connecting pipe is fixedly connected to one end of the second connecting pipe. The mounting hole is provided at the end of the first connecting pipe connected to the corresponding air inlet pipe and air outlet pipe. The mounting hole is coaxially connected to the corresponding air inlet pipe and air outlet pipe. The resistive noise reduction structure is detachably and fixedly installed in the corresponding air inlet pipe and air outlet pipe through the mounting hole. The resistive noise reduction structure and the mounting hole are sealed.

[0012] The resistive noise reduction structure includes a sealing cover, a cage-type frame, and a noise reduction cotton sleeve. The sealing cover is coaxially fixedly installed at one end of the cage-type frame. The noise reduction cotton sleeve is coaxially fixedly sleeved on the outside of the cage-type frame. The noise reduction cotton sleeve is coaxially fixedly installed in the corresponding air inlet pipe and air outlet pipe through the cage-type frame. The sealing cover is sealed and fixedly installed on the outside of the mounting hole.

[0013] The sound-absorbing cotton sleeve has an air inlet on the side near the sealing cover, and the air inlet is coaxially connected to the first connecting pipe.

[0014] Each of the two sides of the partition 1, partition 2 and partition 3 has several annular grooves of different diameters.

[0015] Each of the aforementioned annular grooves is filled with sound-absorbing cotton.

[0016] The outer surfaces of the air inlet pipe, air outlet pipe, and muffler pipe are each coaxially provided with several annular cavities, and the outer surfaces of the air inlet pipe, air outlet pipe, and muffler pipe are each provided with several slots, and the slots are connected to the corresponding annular cavities.

[0017] The air inlet pipe, air outlet pipe, and muffler pipe are each uniformly perforated with a number of holes. The holes on the air inlet pipe are respectively located in the first muffler chamber and the second muffler chamber. The holes on the air outlet pipe are respectively located in the second muffler chamber and the third muffler chamber. The holes on the muffler pipe are located in the second muffler chamber.

[0018] Compared with the prior art, the advantages of this utility model are:

[0019] The overall design of this utility model not only intercepts and filters carbon deposits in the gas through the resistive silencing structure during use, preventing carbon deposits from directly entering the shell and causing blockage, but also works with the internal structure of the shell to reduce noise and improve the silencing effect. At the same time, it is easy to disassemble, clean or replace the resistive silencing structure separately in the future, making the whole system more convenient and flexible. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0021] Figure 2 This is a schematic diagram of a partial cross-sectional view of the shell structure of this utility model.

[0022] Figure 3 This is an exploded view of the resistive silencing structure, air intake pipe, and connecting parts of this utility model.

[0023] Figure 4 This is a schematic diagram of the explosive structure of the resistive silencing structure of this utility model.

[0024] Figure 5 This is a partially enlarged structural diagram of point A of this utility model.

[0025] In the picture:

[0026] 1. Shell; 2. Partition 1; 3. Partition 2; 4. First silencing chamber; 5. Second silencing chamber; 6. Third silencing chamber; 7. Fourth silencing chamber; 8. Inlet pipe; 9. Outlet pipe; 10. Silencer pipe; 11. First connecting pipe; 12. Second connecting pipe; 13. Mounting hole; 14. Sealing cover; 15. Cage frame; 16. Silencer cotton sleeve; 17. Inlet; 18. Ring groove; 19. Silencer cotton; 20. Ring cavity; 21. Slotted groove; 22. Hole; 23. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0028] In the description of the embodiments, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of the utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the present utility model based on the specific circumstances.

[0029] The present invention will be further described below with reference to the accompanying drawings:

[0030] Example

[0031] Reference Figure 1-5 A multi-stage noise reduction muffler for an automotive exhaust system includes a housing 1, an intake pipe 9, an exhaust pipe 10, and a muffler pipe 11. Inside the housing 1, partitions 2, 3, and 4 are sequentially fixedly installed. Partition 2 and housing 1 form a first muffler cavity 5; partition 3, partition 2, and housing 1 form a second muffler cavity 6; partition 4, partition 2, and housing 1 form a third muffler cavity 7; and partition 4 and housing 1 form a fourth muffler cavity 8. The third muffler cavity 7 and the fourth muffler cavity 8 are connected. One end of the intake pipe 9 extends from one end of the housing 1 into the housing 1 and passes through the partitions 2 and 3, forming a fixed connection. The air pipe 9 is connected to the third silencer chamber 7; one end of the air outlet pipe 10 extends from the other end of the housing 1 into the interior of the housing 1 and passes through the partition 3 4 and partition 2 3, and is fixedly connected to the partition 1 2. The air outlet pipe 10 is connected to the first silencer chamber 5; the silencer pipe 11 is fixedly installed between the partition 1 2 and partition 2 3. The silencer pipe 11 is arranged perpendicularly to the partition 1 2 and partition 2 3. The first silencer chamber 5 and the third silencer chamber 7 are connected through the silencer pipe 11 so that gas enters the interior of the housing 1 from the air inlet pipe 9 and is reduced in noise through the partition 1 2, partition 2 3, partition 3 4, first silencer chamber 5, second silencer chamber 6, third silencer chamber 7 and fourth silencer chamber 8.

[0032] In this embodiment, the interior of the air inlet pipe 9 and the air outlet pipe 10 are each detachably fixed with a resistive silencing structure via a connector. This allows the gas to enter the air inlet pipe 9 and be silenced by the resistive silencing structure. The resistive silencing structure also intercepts and adsorbs unburned carbon particles in the gas, preventing the carbon particles from directly entering the interior of the housing 1. When the gas is discharged from the air outlet pipe 10, it can be further silenced by the resistive silencing structure inside the air outlet pipe 10.

[0033] In this embodiment, the connector includes a first connecting pipe 12, a second connecting pipe 13, and a mounting hole 14. One end of the first connecting pipe 12 is fixedly connected to the outer end of the corresponding intake pipe 9 and exhaust pipe 10, and the other end of the first connecting pipe 12 is fixedly connected to one end of the second connecting pipe 13, so as to connect with other components of the vehicle exhaust system through the second connecting pipe 13. The end of the first connecting pipe 12 connected to the corresponding intake pipe 9 and exhaust pipe 10 is provided with a mounting hole 14. The mounting hole 14 is coaxially connected to the corresponding intake pipe 9 and exhaust pipe 10. The resistive muffler structure is detachably and fixedly installed on the corresponding intake pipe 9 and exhaust pipe 10 through the mounting hole 14, such as by bolts, so as to disassemble and assemble the resistive muffler structure separately. The resistive muffler structure and the mounting hole 14 are sealed to ensure the quality of noise reduction.

[0034] In this embodiment, the resistive silencing structure includes a sealing cap 15, a cage-like frame 16, and a silencing cotton sleeve 17. The sealing cap 15 is coaxially fixedly installed at one end of the cage-like frame 16, and the silencing cotton sleeve 17 is coaxially fixedly sleeved on the outside of the cage-like frame 16 so as to support the silencing cotton sleeve 17 and prevent the silencing cotton sleeve 17 from collapsing. The silencing cotton sleeve 17 is coaxially fixedly installed in the corresponding air inlet pipe 9 and air outlet pipe 10 through the cage-like frame 16. The sealing cap 15 is sealed and fixedly installed on the outside of the mounting hole 14 so as to seal the mounting hole 14 and prevent gas leakage.

[0035] In this embodiment, the sound-absorbing cotton sleeve 17 has an air inlet 18 on the side near the sealing cover 15. The air inlet 18 is coaxially connected to the first connecting pipe 12. Activated carbon is provided in the sound-absorbing cotton sleeve 17 so that the automobile gas can enter the sound-absorbing cotton sleeve 17 from the air inlet 18 to silence the gas and adsorb the carbon particles in the gas that are not fully burned.

[0036] In this embodiment, several annular grooves 19 of different diameters are provided on both sides of partition 1 2, partition 2 3 and partition 3 4 in order to reduce the overall weight and absorb sound.

[0037] In this embodiment, each annular groove 19 is filled with sound-absorbing cotton 20 and an activated carbon filter sheet of the same shape as the annular groove 19, so as to reduce the overall weight and absorb sound, while adsorbing unburned carbon particles in the gas.

[0038] In this embodiment, the outer surfaces of the air inlet pipe 9, the air outlet pipe 10, and the muffler pipe 11 are each coaxially provided with a plurality of annular cavities 21, and the outer surfaces of the air inlet pipe 9, the air outlet pipe 10, and the muffler pipe 11 are each provided with a plurality of slots 22. The slots 22 are connected to the corresponding annular cavities 21 in order to reduce the overall weight and to absorb sound.

[0039] In this embodiment, a plurality of holes 23 are evenly provided through the air inlet pipe 9, the air outlet pipe 10, and the silencer pipe 11. The holes 23 on the air inlet pipe 9 are respectively located in the first silencer chamber 5 and the second silencer chamber 6. The holes 23 on the air outlet pipe 10 are respectively located in the second silencer chamber 6 and the third silencer chamber 7. The holes 23 on the silencer pipe 11 are located in the second silencer chamber 6, so that the gas can enter the corresponding first silencer chamber 5, second silencer chamber 6, and third silencer chamber 7 through the holes 23 for silencer.

[0040] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solution described in this utility model, or by designing a similar technical solution inspired by the technical solution described in this utility model, falls within the protection scope of this utility model.

Claims

1. A multi-stage noise reduction muffler for automotive exhaust systems, characterized in that: It includes a housing (1), an air inlet pipe (9), an air outlet pipe (10), and a silencer pipe (11), wherein: a partition 1 (2), a partition 2 (3), and a partition 3 (4) are fixedly installed inside the housing (1) in sequence; a first silencer cavity (5) is formed between the partition 1 (2) and the housing (1); a second silencer cavity (6) is formed between the partition 2 (3), the partition 1 (2), and the housing (1); a third silencer cavity (7) is formed between the partition 3 (4), the partition 2 (3), and the housing (1); and a fourth silencer cavity (8) is formed between the partition 3 (4) and the housing (1). The third silencing cavity (7) is connected to the fourth silencing cavity (8); One end of the air intake pipe (9) extends from one end of the housing (1) into the interior of the housing (1) and passes through the partition plate one (2) and the partition plate two (3) for fixed connection. The air intake pipe (9) is connected to the third silencer chamber (7). One end of the vent pipe (10) extends into the interior of the housing (1) from the other end of the housing (1) and passes through the partition three (4) and partition two (3) and is fixedly connected to the partition one (2). The vent pipe (10) is connected to the first silencing cavity (5). The silencer pipe (11) is fixedly installed between partition one (2) and partition two (3). The silencer pipe (11) is arranged perpendicularly to partition one (2) and partition two (3). The first silencer cavity (5) and the third silencer cavity (7) are connected through the silencer pipe (11). The air inlet pipe (9) and air outlet pipe (10) are each detachably fixed with a resistive noise reduction structure through a connector; The connector includes a first connecting pipe (12), a second connecting pipe (13), and a mounting hole (14). One end of the first connecting pipe (12) is fixedly connected to the outer end of the corresponding air inlet pipe (9) and air outlet pipe (10). The other end of the first connecting pipe (12) is fixedly connected to one end of the second connecting pipe (13). The end of the first connecting pipe (12) connected to the corresponding air inlet pipe (9) and air outlet pipe (10) is provided with a mounting hole (14). The mounting hole (14) is coaxially connected to the corresponding air inlet pipe (9) and air outlet pipe (10). The resistive noise reduction structure is detachably fixedly installed in the corresponding air inlet pipe (9) and air outlet pipe (10) through the mounting hole (14). The resistive noise reduction structure and the mounting hole (14) are sealed. The resistive silencing structure includes a sealing cap (15), a cage-type frame (16), and a silencing cotton sleeve (17). The sealing cap (15) is coaxially fixed at one end of the cage-type frame (16). The silencing cotton sleeve (17) is coaxially fixed on the outside of the cage-type frame (16). The silencing cotton sleeve (17) is coaxially fixed in the corresponding air inlet pipe (9) and air outlet pipe (10) through the cage-type frame (16). The sealing cap (15) is sealed and fixed on the outside of the mounting hole (14). The sound-absorbing cotton sleeve (17) has an air inlet (18) on the side near the sealing cover (15), and the air inlet (18) is coaxially connected to the first connecting pipe (12).

2. The multi-stage noise reduction muffler for an automotive exhaust system as described in claim 1, characterized in that: Each of the two sides of the partition 1 (2), partition 2 (3) and partition 3 (4) is provided with a number of annular grooves (19) of different diameters.

3. A multi-stage noise reduction muffler for an automotive exhaust system as described in claim 2, characterized in that: Each of the aforementioned annular grooves (19) is filled with sound-absorbing cotton (20).

4. A multi-stage noise reduction muffler for an automotive exhaust system as described in claim 1, characterized in that: The outer surfaces of the air inlet pipe (9), air outlet pipe (10) and muffler pipe (11) are each provided with a plurality of annular cavities (21) on the same axis. The outer surfaces of the air inlet pipe (9), air outlet pipe (10) and muffler pipe (11) are each provided with a plurality of slots (22), and the slots (22) are connected to the corresponding annular cavities (21).

5. A multi-stage noise reduction muffler for an automotive exhaust system as described in claim 4, characterized in that: The air inlet pipe (9), air outlet pipe (10) and silencer pipe (11) are each uniformly perforated with a number of holes (23). The holes (23) on the air inlet pipe (9) are respectively located in the first silencer chamber (5) and the second silencer chamber (6). The holes (23) on the air outlet pipe (10) are respectively located in the second silencer chamber (6) and the third silencer chamber (7). The holes (23) on the silencer pipe (11) are located in the second silencer chamber (6).

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