Automobile exhaust silencing bag

Abstract

The utility model relates to the technical field of automobile exhaust, in particular to an automobile exhaust silencing bag which comprises a shell. Sound-absorbing cotton is arranged on the left side of the right end cover; a first partition plate is arranged on the left side of the sound-absorbing cotton; an air inlet mechanism is arranged on the left side of the first partition plate; a second partition plate is connected to the left side of the air inlet mechanism; a fourth partition plate is installed on the left side in the shell, an exhaust mechanism is installed between the third partition plate and the fourth partition plate, a plurality of vent holes are formed in the four partition plates, and a left end cover is connected to the left side of the shell; according to the utility model, a modular assembly and shell post-forming mode is adopted, an internal partition plate, an air inlet mechanism and an air outlet mechanism are integrated into two modules in advance, the assembly efficiency and the positioning precision are greatly improved, the modules are arranged after the shell is rolled, and the end cover is pressed and buckled, so that the accuracy and the stability of the relative positions of internal parts are ensured, and the stability and the quality of welding are improved.

Description

Technical Field

[0001] This utility model relates to the field of automotive exhaust technology, and in particular to automotive exhaust muffler kits. Background Technology

[0002] Automotive exhaust mufflers are an important component of the exhaust system, primarily used to reduce exhaust noise generated during engine operation and optimize exhaust airflow. In recent years, competition in my country's automotive industry has become increasingly fierce. Faced with the impact of pure electric vehicles, fuel vehicles (including hybrid vehicles) are increasingly emphasizing cost reduction while ensuring strength in their exhaust systems.

[0003] During the welding process of existing automotive exhaust mufflers, the internal components, such as porous baffles and sound-absorbing materials, are difficult to precisely position during welding, resulting in insufficient assembly precision. Defects such as porosity, incomplete fusion, and slag shedding with abnormal noises are prone to occur in the weld, affecting the sealing performance and durability of the muffler.

[0004] Therefore, in view of the problems of complex internal structure, easy assembly deviation, weld defects and poor sealing caused by welding of existing automotive exhaust mufflers, which affect product durability, an automotive exhaust muffler can be designed. Utility Model Content

[0005] To overcome the problems of complex internal structure, welding easily leads to assembly deviations, weld defects and poor sealing, which affect the durability of existing automotive exhaust mufflers.

[0006] The technical solution of this utility model is as follows: a car exhaust muffler, including a shell; and a right end cover installed on the right side of the shell, with sound-absorbing cotton on the left side of the right end cover, a first partition on the left side of the sound-absorbing cotton, an air intake mechanism on the left side of the first partition, a second partition connected to the left side of the air intake mechanism, a third partition installed inside the shell on the left side of the second partition, a fourth partition installed inside the shell on the left side, an exhaust mechanism installed between the third partition and the fourth partition, and several vent holes opened on each of the four partitions. A left end cover is connected to the left side of the shell.

[0007] Preferably, by setting four partitions, during assembly and welding, the first partition, the second partition, and the intake mechanism are fixed as one module, and the third partition, the fourth partition, and the exhaust mechanism are fixed as another module. Then, the shell is rolled and pressed into shape, and sound-absorbing cotton is placed inside the shell. The two modules are then placed inside the shell in sequence. Next, the right end cover and the left end cover are pressed onto both ends of the shell. Finally, it is sent to the welding station for welding and fixing. The overall material is thin, which can achieve lightweighting. At the same time, the various components inside the shell are easy to accurately position, ensuring stable welding quality. This solves the problem that in the existing automotive exhaust muffler packs, the muffler pack usually contains porous partitions, sound-absorbing materials, and other components. The welding is difficult to accurately position, resulting in insufficient assembly precision. Defects such as porosity, incomplete fusion, and slag falling off and causing abnormal noises in the weld are prone to occur, affecting the sealing and durability of the muffler pack.

[0008] Preferably, the intake mechanism includes a support assembly and a connecting assembly. The support assembly supports the first and second partitions, and the connecting assembly connects the housing to the external exhaust pipe.

[0009] Preferably, the support assembly includes a support plate, and the support plate is fixed between the first partition and the second partition.

[0010] Preferably, the connecting component includes a connecting hole and an air inlet pipe. The connecting hole is provided through the support plate, and the air inlet pipe is fixed on the rear side of the support plate at the position corresponding to the connecting hole. The air inlet pipe passes through the housing.

[0011] Preferably, the exhaust mechanism includes an air guiding component and an air outlet component. The air guiding component is used to guide the exhaust gas inside the housing to the air outlet component, and the air outlet component is used to discharge the exhaust gas inside the housing.

[0012] Preferably, the air guiding assembly includes an air vent, and the air vent is embedded in the fourth partition.

[0013] Preferably, the venting assembly includes a high-frequency pipe and an exhaust pipe. The right end of the venting pipe is connected to the high-frequency pipe, which is U-shaped. The left end of the high-frequency pipe passes through the fourth partition and is connected to the exhaust pipe, which is connected to the left end cover.

[0014] The beneficial effects of this utility model are:

[0015] The manufacturing process of this automotive exhaust muffler adopts a modular assembly and shell post-forming method. The internal partition and intake and exhaust mechanisms are pre-integrated into two independent modules, which greatly improves assembly efficiency and positioning accuracy. After the shell is rolled into a circle, it is inserted into the module and supplemented by end cap snap-fit, which ensures the accuracy and stability of the relative position of the internal components. This effectively eliminates defects such as welding porosity, incomplete fusion, and abnormal noise from slag shedding, significantly improving welding quality and stability. The overall thin-walled design is conducive to lightweighting, ultimately enhancing the overall sealing, durability, and reliability of the muffler. Attached Figure Description

[0016] Figure 1 The diagram shown is a three-dimensional structural schematic of this utility model;

[0017] Figure 2 The diagram shown is a three-dimensional structural schematic of the first partition of this utility model;

[0018] Figure 3 The diagram shown is a three-dimensional structural schematic of the support plate of this utility model.

[0019] Figure 4 The diagram shown is a three-dimensional structural schematic of the exhaust mechanism of this utility model.

[0020] Figure 5 The diagram shown is a rear-view three-dimensional structural schematic of this utility model.

[0021] Explanation of reference numerals in the attached drawings: 1. Shell; 2. Right end cover; 3. Sound-absorbing cotton; 4. First partition; 51. Support plate; 52. Connecting hole; 53. Air inlet pipe; 6. Second partition; 7. Third partition; 8. Fourth partition; 91. High-frequency fitting; 92. Exhaust pipe; 93. Vent pipe; 10. Vent hole; 11. Left end cover. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Please see Figures 1-5 This utility model provides an embodiment of an automotive exhaust muffler, comprising a housing 1; and a right end cover 2 installed on the right side of the housing 1. Sound-absorbing cotton 3 is disposed on the left side of the right end cover 2, and a first partition 4 is disposed on the left side of the sound-absorbing cotton 3. An air intake mechanism is disposed on the left side of the first partition 4, and a second partition 6 is connected to the left side of the air intake mechanism. A third partition 7 is installed inside the housing 1 on the left side of the second partition 6, and a fourth partition 8 is installed on the left side of the inside of the housing 1. An exhaust mechanism is installed between the third partition 7 and the fourth partition 8. Each of the four partitions has several vent holes 10. The left side of the housing 1 is connected to the left end cover 11. The first partition 4 and the second partition 6 are pre-welded with the air intake mechanism to form the front module. The third partition 7 and the fourth partition 8 are integrated with the exhaust mechanism to form the rear module. After the housing 1 is rolled into a circle, sound-absorbing cotton 3 is first laid in the inner cavity, and then the front module and the rear module are installed in sequence. The right end cover 2 and the left end cover 11 are sealed at both ends of the housing 1 by a snap-fit ​​process. Finally, the overall welding is completed by the welding station. The structure uses thin materials to achieve lightweight design. The modular assembly method ensures that the internal components of the housing 1 are accurately positioned, effectively ensuring the consistency of welding quality.

[0024] Please see Figure 1 , Figure 2 and Figure 5 In this embodiment, the air intake mechanism includes a support component and a connecting component. The support component is used to support the first partition 4 and the second partition 6. The connecting component is used to connect the housing 1 with the external exhaust pipe. The support component includes a support plate 51. The support plate 51 is fixed between the first partition 4 and the second partition 6. By setting the support plate 51, the first partition 4 and the second partition 6 can be connected and positioned. The connecting component includes a connecting hole 52 and an air intake pipe 53. The connecting hole 52 is provided through the support plate 51. The air intake pipe 53 is fixed on the rear side of the support plate 51 at the position corresponding to the connecting hole 52. The air intake pipe 53 passes through the housing 1. By setting the connecting hole 52 and the air intake pipe 53, exhaust gas can be transported from the air intake pipe 53 to the inside of the housing 1.

[0025] Please see Figures 1-4 In this embodiment, the exhaust mechanism includes an air guiding component and an air outlet component. The air guiding component is used to guide the exhaust gas inside the housing 1 to flow into the air outlet component. The air outlet component is used to discharge the exhaust gas inside the housing 1. The air guiding component includes a vent pipe 93. The vent pipe 93 is embedded in the fourth partition 8. By setting the vent pipe 93, after the exhaust gas enters from the air inlet pipe 53, part of it passes through the vent hole 10 of the first partition 4 and is directly discharged through the sound-absorbing cotton. The other part passes through multiple chambers and then enters the interior of the vent pipe 93. The air outlet component includes a high-frequency tube 91 and an exhaust pipe 92. The right end of the vent pipe 93 is connected to the high-frequency tube 91. The high-frequency tube 91 is U-shaped. The left end of the high-frequency tube 91 passes through the fourth partition 8 and is connected to the exhaust pipe 92. The exhaust pipe 92 is connected to the left end cover 11. By setting the high-frequency tube 91, the exhaust gas entering the vent pipe 93 will flow inside the high-frequency tube 91 and then be discharged through the exhaust pipe 92.

[0026] During operation, external exhaust gas enters the housing 1 through the intake pipe 53. Part of the exhaust gas passes directly through the vent hole 10 on the first partition 4, enters the sound-absorbing cotton 3 area, is absorbed, and is then discharged. The other part of the exhaust gas passes through the vent holes 10 on the second partition 6 and the third partition 7 in sequence, expands and reflects in the multiple chambers formed inside the housing 1, and consumes energy. After that, the exhaust gas enters the vent pipe 93 on the fourth partition 8, flows through the high-frequency pipe 91, is diverted, and further attenuates the noise. Finally, it is discharged from the left end cover 11 through the exhaust pipe 92, achieving a broadband noise attenuation effect.

[0027] Through the above steps, the structure is divided into two functional modules, front and rear, by four partitions. The front module is composed of the first partition 4 and the second partition 6 welded to the intake mechanism, while the rear module is formed by the third partition 7 and the fourth partition 8 fixed to the exhaust mechanism. In the manufacturing process, the flat shell 1 is first rolled and pressed into shape. Then, sound-absorbing cotton 3 is laid inside the formed shell 1. The two pre-assembled modules are installed into the shell 1 in front and back order. Then, the right end cover 2 and the left end cover 11 are installed at both ends of the shell 1 by a snap-fit ​​process. Finally, the whole structure is fixed by welding. This structural design ensures lightweight while ensuring the precise positioning of each component in the shell 1 through modular pre-assembly, thereby ensuring the stability and consistency of welding quality. This solves the problem that existing automotive exhaust mufflers, which usually contain porous partitions, sound-absorbing materials, and other components, are difficult to precisely position during welding, resulting in insufficient assembly precision and defects such as porosity, incomplete fusion, and slag shedding and abnormal noise in the weld, affecting the sealing and durability of the muffler.

Claims

1. A car exhaust muffler, comprising a housing (1); characterized in that: It also includes a right end cover (2) installed on the right side of the housing (1), a sound-absorbing cotton (3) is provided on the left side of the right end cover (2), a first partition (4) is provided on the left side of the sound-absorbing cotton (3), an air intake mechanism is provided on the left side of the first partition (4), a second partition (6) is connected to the left side of the air intake mechanism, a third partition (7) is installed inside the housing (1) on the left side of the second partition (6), a fourth partition (8) is installed inside the housing (1) on the left side, an exhaust mechanism is installed between the third partition (7) and the fourth partition (8), and several ventilation holes (10) are opened on the four partitions. A left end cover (11) is connected to the left side of the housing (1).

2. The automotive exhaust muffler according to claim 1, characterized in that: The intake mechanism includes a support component and a connecting component. The support component is used to support the first partition (4) and the second partition (6). The connecting component is used to connect the housing (1) with the external exhaust pipe.

3. The automotive exhaust muffler according to claim 2, characterized in that: The support assembly includes a support plate (51), and the support plate (51) is fixed between the first partition (4) and the second partition (6).

4. The automotive exhaust muffler according to claim 3, characterized in that: The connecting component includes a connecting hole (52) and an air inlet pipe (53). The connecting hole (52) is provided through the support plate (51). The air inlet pipe (53) is fixed on the rear side of the support plate (51) at the position corresponding to the connecting hole (52). The air inlet pipe (53) passes through the housing (1).

5. The automotive exhaust muffler according to claim 1, characterized in that: The exhaust mechanism includes an air guiding component and an air outlet component. The air guiding component is used to guide the exhaust gas inside the housing (1) to the air outlet component, and the air outlet component is used to discharge the exhaust gas inside the housing (1).

6. The automotive exhaust muffler according to claim 5, characterized in that: The air guiding assembly includes an air duct (93), and the air duct (93) is embedded in the fourth partition (8).

7. The automotive exhaust muffler according to claim 6, characterized in that: The exhaust assembly includes a high-frequency tube (91) and an exhaust pipe (92). The right end of the vent pipe (93) is connected to the high-frequency tube (91). The high-frequency tube (91) is U-shaped. The left end of the high-frequency tube (91) passes through the fourth partition (8) and is connected to the exhaust pipe (92). The exhaust pipe (92) is connected to the left end cap (11).

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