A muffler for a gasoline engine

Abstract

The utility model relates to a muffler for gasoline generator, including the shell, be equipped with the air inlet pipe and exhaust silencer pipe on the shell, the shell inside is equipped with the expansion chamber, first chamber, second chamber and the sound attenuation chamber, air inlet pipe, expansion chamber, first chamber, second chamber, sound attenuation chamber and exhaust silencer pipe communicate in proper order, exhaust silencer pipe one end is exhaust end, exhaust end stretches out the shell, and the pipe wall on exhaust end is equipped with a plurality of overflow holes, the overflow hole is in the form of annular array distribution on the pipe wall, compared with prior art, the utility model muffler shell inside is equipped with a plurality of chambers, can realize multistage noise reduction, and, be equipped with a plurality of annular array distribution overflow holes on the exhaust end pipe wall of exhaust silencer pipe, can balanced pressure relief to tail gas, avoid producing exhaust howling phenomenon, and then effectively improve the sound attenuation effect of muffler.

Description

Technical Field

[0001] This utility model relates to the field of muffler technology, specifically to a muffler for gasoline generators. Background Technology

[0002] A gasoline generator consists of a connected engine and a generator. During operation, the engine produces significant exhaust noise, necessitating the use of a muffler to reduce the noise. In existing technology, the muffler housing has an intake pipe and an exhaust muffler pipe. Engine exhaust gas enters the muffler chamber inside the housing through the intake pipe and exits from the end of the exhaust muffler pipe. However, the existing muffler housing has a simple muffler chamber structure, resulting in poor noise reduction. Furthermore, due to the high exhaust pressure, the exhaust muffler pipe is prone to whistling, further contributing to the muffler's poor noise reduction effect. Additionally, existing technologies often increase the muffler housing wall thickness or enlarge the internal space to improve noise reduction. Both of these solutions increase material consumption, raising costs, and increase size, requiring simultaneous modifications to the muffler cover, which also increases costs. Utility Model Content

[0003] The purpose of this utility model is to provide a muffler for gasoline generators, addressing the problem that the existing muffler housing has a simple silencing chamber structure and that the exhaust silencing pipe is prone to exhaust whistling due to the high exhaust pressure, which together lead to poor muffler silencing effect.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A muffler for a gasoline generator includes a housing with an intake pipe and an exhaust muffler. Inside the housing are an expansion chamber, a first chamber, a second chamber, and a muffler. The intake pipe, expansion chamber, first chamber, second chamber, muffler, and exhaust muffler are sequentially connected. One end of the exhaust muffler is an exhaust end that extends out of the housing. The exhaust end has multiple overflow holes on its wall, which are arranged in a ring array on the wall.

[0005] The present invention, employing the aforementioned technical solution, establishes interconnected expansion chambers, first chambers, second chambers, and muffler chambers within the muffler housing. Engine exhaust gases sequentially pass through the intake pipe, expansion chamber, first chamber, second chamber, muffler chamber, and exhaust muffler pipe, undergoing noise reduction treatment in multiple chambers, effectively lowering the noise generated by the exhaust gases. Simultaneously, overflow holes are opened on the exhaust end wall of the exhaust muffler pipe to relieve pressure on the discharged exhaust gases, preventing excessive pressure and exhaust whine. Furthermore, multiple overflow holes are distributed in a ring array on the pipe wall, ensuring that the exhaust gases... This new muffler features a circumferentially evenly depressurized casing, resulting in a more stable and balanced airflow that is more conducive to noise reduction. Compared to existing technologies where the muffler housing has a simple silencing chamber structure and the exhaust pipe is prone to exhaust whistling due to high exhaust pressure, leading to poor muffler performance, this new muffler housing has multiple chambers inside, enabling multi-stage noise reduction. Furthermore, multiple overflow holes arranged in a ring array on the exhaust end wall of the exhaust pipe allow for even depressurization of the exhaust gas, preventing exhaust whistling and effectively improving the muffler's noise reduction effect.

[0006] Furthermore, the outer shell includes an upper shell and a lower shell. The lower shell is provided with heat insulation cotton and a heat insulation cotton pressure plate inside. The heat insulation cotton pressure plate presses the heat insulation cotton tightly against the inner wall of the lower shell. This arrangement facilitates the installation of heat insulation cotton and can play a role in heat insulation and sound insulation.

[0007] Furthermore, the heat insulation cotton includes a heat insulation cotton matrix and aerogel powder, wherein the aerogel powder is uniformly dispersed in the heat insulation cotton matrix; aerogel has excellent heat insulation and sound insulation effects, and the uniformly dispersed aerogel powder in the heat insulation cotton has better heat insulation and sound insulation effects than ordinary heat insulation cotton, thereby enabling the silencer to have a better noise reduction effect.

[0008] Furthermore, the heat insulation cotton pressing plate has a porous mesh structure; setting the heat insulation cotton pressing plate as a porous mesh structure is beneficial for weight reduction and cost saving compared to the solid plate in the prior art.

[0009] Furthermore, the upper and lower housings are connected using a mold riveting process, which replaces the welding process in the prior art. This not only meets product quality requirements but also reduces costs and improves production efficiency. If noise levels permit, thinner materials can be used without worrying about burn-through.

[0010] Furthermore, the first chamber is located inside the lower shell, and the second chamber is located inside the upper shell. A first partition is provided between the upper and lower shells to separate the first and second chambers. A second partition is provided on the side of the first partition facing the upper shell. The expansion chamber is formed by the enclosing of the first and second partitions. A silencer pipe is provided between the upper shell and the first partition. The silencer pipe is sleeved on the outside of the exhaust silencer pipe. The upper shell, the first partition, the silencer pipe, and the exhaust silencer pipe together form a silencer chamber. The arrangement of each chamber inside the muffler shell is reasonable and guides the exhaust flow direction according to the design, resulting in good noise reduction effect.

[0011] Furthermore, the end of the exhaust muffler pipe furthest from the exhaust end is the air intake end; the exhaust muffler pipe passes through the lower housing and the first partition, and the end of the air intake end is fixed to the inner wall of the upper housing.

[0012] Furthermore, the first partition is a flat plate, and the second partition is an arched plate; the second partition is located at the edge region of the first partition, and the exhaust muffler pipe passes through the middle region of the first partition.

[0013] Furthermore, the exhaust end is equipped with a spark eliminator, and the end of the spark eliminator is provided with a mesh plate; the spark eliminator has the function of eliminating sparks in the exhaust gas, and the mesh plate has the function of reducing exhaust noise and preventing impurities from entering the exhaust muffler.

[0014] Compared to existing technologies, the advantages of this invention are as follows: The muffler housing has multiple internal chambers, enabling multi-stage noise reduction. Furthermore, multiple annularly arrayed overflow holes on the exhaust end wall of the exhaust muffler pipe allow for balanced pressure relief of the exhaust gas, preventing exhaust whistling and effectively improving the muffler's noise reduction effect. The insulation cotton contains uniformly dispersed aerogel powder, which provides better heat and sound insulation than ordinary insulation cotton, resulting in better noise reduction. The insulation cotton pressure plate is designed as a porous mesh structure, which, compared to the solid sheet material in existing technologies, facilitates weight reduction and cost savings. The upper and lower shells are connected using a mold riveting process, replacing the welding process in existing technologies. This meets product quality requirements, reduces costs, and improves production efficiency. Where noise levels permit, thinner materials can be used without worrying about weld burn-through. Attached image description: Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the structure of this utility model after the lower shell has been removed; Figure 3 This is a front sectional view of the present invention; Figure 4 This is a side sectional view of the present invention; Figure 5This is a schematic diagram of the first partition.

[0015] The markings in the diagram are: 1-Intake pipe, 2-Expansion chamber, 3-First chamber, 4-Second chamber, 5-Silencer chamber, 6-Exhaust silencer pipe, 7-Exhaust end, 8-Overflow hole, 9-Upper shell, 10-Lower shell, 11-Insulation cotton, 12-Insulation cotton pressure plate, 13-First partition, 14-Second partition, 15-Silencer pipe, 16-Intake end, 17-Spark extinguisher, 18-Wire mesh, 19-Spark cap, 20-Clamp, 21-Flange, 22-Reinforcing plate, 23-Mounting lug, 24-First through hole, 25-Second through hole, 26-Third through hole, 27-Fourth through hole, 28-Fifth through hole. Detailed Implementation

[0016] The present invention will now be described in detail with reference to the accompanying drawings.

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0018] This embodiment provides a muffler for a gasoline generator, such as... Figures 1-5 As shown, the device includes an outer shell, on which an air intake pipe 1 and an exhaust muffler pipe 6 are provided. Inside the outer shell, there are an expansion chamber 2, a first chamber 3, a second chamber 4, and a muffler chamber 5. The air intake pipe 1, expansion chamber 2, first chamber 3, second chamber 4, muffler chamber 5, and exhaust muffler pipe 6 are connected in sequence. One end of the exhaust muffler pipe 6 is an exhaust end 7, which extends out of the outer shell. Multiple overflow holes 8 are provided on the pipe wall of the exhaust end 7, and the overflow holes 8 are distributed on the pipe wall in a ring array. The outer shell includes an upper shell 9 and a lower shell 10. The lower shell 10 is provided with heat insulation cotton 11 and heat insulation cotton pressing plate 12 inside. The heat insulation cotton pressing plate 12 presses the heat insulation cotton 11 tightly onto the inner wall of the lower shell 10. The heat insulation cotton 11 includes a heat insulation cotton matrix and aerogel powder, with the aerogel powder uniformly dispersed in the heat insulation cotton matrix. The heat insulation cotton pressing plate 12 has a porous mesh structure. In this embodiment, the heat insulation cotton pressing plate 12 is selected as an iron mesh. The upper shell 9 and the lower shell 10 are connected by a mold riveting process. The upper shell 9 is provided with mounting lugs 23 to facilitate the installation of this silencer. The first chamber 3 is located inside the lower shell 10, and the second chamber 4 is located inside the upper shell 9. A first partition 13 is provided between the upper shell 9 and the lower shell 10 to separate the first chamber 3 and the second chamber 4. A second partition 14 is provided on the side of the first partition 13 facing the upper shell 9. The expansion chamber 2 is formed by the first partition 13 and the second partition 14. A silencer pipe 15 is provided between the upper shell 9 and the first partition 13. The silencer pipe 15 is sleeved on the outside of the exhaust silencer pipe 6. The upper shell 9, the first partition 13, the silencer pipe 15 and the exhaust silencer pipe 6 together form the silencer chamber 5. The end of the exhaust muffler pipe 6 away from the exhaust end 7 is the air intake end 16; the exhaust muffler pipe 6 passes through the lower housing 10 and the first partition 13, and the end of the air intake end 16 is fixed to the inner wall of the upper housing 9. The first partition 13 is a flat plate, and the second partition 14 is an arched plate. The second partition 14 is located at the edge of the first partition 13, and the exhaust muffler pipe 6 passes through the middle area of ​​the first partition 13. One end of the intake pipe 1 is sequentially inserted into the upper housing 9 and the second partition 14, so that the intake pipe 1 communicates with the diffuser chamber 2. A reinforcing plate 22 is provided on the inner wall of the upper housing 9 to support the intake pipe 1 and improve the structural strength and stability of the end area of ​​the intake pipe 1. The other end of the intake pipe 1 extends out of the upper housing 9, and a flange 21 is provided at the end for easy connection to the engine. One side of the first partition 13 is provided for the passage of the engine exhaust. The air intake 16 has multiple first through holes 24 for air intake, and multiple second through holes 25 for engine exhaust gas to pass through on the other side. A third through hole 26 for passing through the exhaust muffler pipe 6 is provided between the two. The muffler pipe 15 has multiple fourth through holes 27 for engine exhaust gas to pass through, and the intake end 16 has multiple fifth through holes 28 for engine exhaust gas to pass through. The expansion chamber 2 is connected to the first chamber 3 through the first through holes 24. The first chamber 3 is connected to the second chamber 4 through the second through holes 25. The second chamber 4 is connected to the muffler chamber 5 through the fourth through holes 27. The muffler chamber 5 is connected to the exhaust muffler pipe 6 through the fifth through holes 28. The exhaust end 7 has a built-in spark eliminator 17, and the end of the spark eliminator 17 is provided with a mesh 18; the spark cap 19 is fitted on the mesh 18 and the outer wall of the exhaust end 7, and is fastened and fixed by the clamp 20, thereby fixing the spark eliminator 17 and the mesh 18; the engine exhaust gas is discharged through the spark eliminator 17, the mesh 18 and the overflow hole 8.

[0019] The present invention, employing the aforementioned technical solution, establishes interconnected expansion chamber 2, first chamber 3, second chamber 4, and silencing chamber 5 within the muffler housing. Engine exhaust gas sequentially passes through intake pipe 1, expansion chamber 2, first chamber 3, second chamber 4, silencing chamber 5, and exhaust muffler pipe 6, undergoing noise reduction treatment in multiple chambers, effectively lowering the noise generated by the exhaust gas. Simultaneously, overflow holes 8 are opened on the pipe wall at the exhaust end 7 of the exhaust muffler pipe 6, which can relieve pressure on the exhaust gas, preventing excessive pressure and exhaust whine. Furthermore, the multiple overflow holes 8 are distributed in a ring array on the pipe wall, allowing for uniform pressure relief of the exhaust gas in the circumferential direction, resulting in a more stable and balanced airflow, further contributing to noise reduction. Compared to existing technologies where the silencing chamber structure inside the muffler housing is simple and the exhaust muffler pipe is prone to exhaust whine due to higher exhaust pressure, both of which contribute to poor muffler noise reduction performance, this invention addresses the issue of excessive exhaust pressure. To address the issue of noise reduction, this utility model's muffler housing has multiple internal chambers, enabling multi-stage noise reduction. Furthermore, multiple annularly arrayed overflow holes 8 are provided on the exhaust end 7 of the exhaust muffler pipe 6, allowing for balanced pressure relief of the exhaust gas and preventing exhaust whistling, thus effectively improving the muffler's noise reduction effect. Simultaneously, the heat insulation cotton 11 contains uniformly dispersed aerogel powder, which provides better heat and sound insulation compared to ordinary heat insulation cotton, resulting in better noise reduction. The heat insulation cotton pressure plate 12 is designed as a porous mesh structure, which, compared to the solid sheet material in existing technologies, facilitates weight reduction and cost savings. The upper shell 9 and lower shell 10 are connected using a mold riveting process, replacing the welding process in existing technologies. This not only meets product quality requirements but also reduces costs and improves production efficiency. Where noise levels permit, thinner materials can be used without worrying about weld burn-through.

[0020] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A muffler for a gasoline generator, comprising a housing, wherein an intake pipe (1) and an exhaust muffler pipe (6) are provided on the housing, characterized in that: The outer shell is provided with an expansion chamber (2), a first chamber (3), a second chamber (4) and a silencer chamber (5). The air intake pipe (1), expansion chamber (2), first chamber (3), second chamber (4), silencer chamber (5) and exhaust silencer pipe (6) are connected in sequence. One end of the exhaust silencer pipe (6) is the exhaust end (7). The exhaust end (7) extends out of the outer shell, and multiple overflow holes (8) are opened on the pipe wall of the exhaust end (7). The overflow holes (8) are distributed on the pipe wall in a ring array.

2. The muffler for a gasoline generator according to claim 1, characterized in that: The outer shell includes an upper shell (9) and a lower shell (10). The lower shell (10) is provided with heat insulation cotton (11) and heat insulation cotton pressure plate (12). The heat insulation cotton pressure plate (12) presses the heat insulation cotton (11) tightly onto the inner wall of the lower shell (10).

3. The muffler for a gasoline generator according to claim 2, characterized in that: The heat insulation cotton (11) includes a heat insulation cotton matrix and aerogel powder, wherein the aerogel powder is uniformly dispersed in the heat insulation cotton matrix.

4. The muffler for a gasoline generator according to claim 2, characterized in that: The heat insulation cotton pressure plate (12) has a porous mesh structure.

5. The muffler for a gasoline generator according to claim 2, characterized in that: The upper shell (9) and the lower shell (10) are connected by a mold riveting process.

6. The muffler for a gasoline generator according to claim 2, characterized in that: The first chamber (3) is located inside the lower shell (10), and the second chamber (4) is located inside the upper shell (9). A first partition (13) is provided between the upper shell (9) and the lower shell (10) to separate the first chamber (3) and the second chamber (4). A second partition (14) is provided on the side of the first partition (13) facing the upper shell (9). The expansion chamber (2) is formed by the first partition (13) and the second partition (14). A silencer pipe (15) is provided between the upper shell (9) and the first partition (13). The silencer pipe (15) is sleeved on the outside of the exhaust silencer pipe (6). The upper shell (9), the first partition (13), the silencer pipe (15) and the exhaust silencer pipe (6) together form the silencer chamber (5).

7. The muffler for a gasoline generator according to claim 6, characterized in that: The end of the exhaust muffler (6) away from the exhaust end (7) is the air inlet (16); the exhaust muffler (6) passes through the lower housing (10) and the first partition (13), and the end of the air inlet (16) is fixed on the inner wall of the upper housing (9).

8. The muffler for a gasoline generator according to claim 7, characterized in that: The first partition (13) is a flat plate, and the second partition (14) is an arched plate; the second partition (14) is located at the edge area of ​​the first partition (13), and the exhaust silencer pipe (6) passes through the middle area of ​​the first partition (13).

9. The muffler for a gasoline generator according to claim 1, characterized in that: The exhaust end (7) has a built-in spark extinguisher (17), and the end of the spark extinguisher (17) is provided with a mesh (18).

Images