Universal gasoline engine silencer

Abstract

The utility model belongs to the technical field of silencers, and particularly relates to a general gasoline engine silencer which comprises an outer cover, an inner container and an exhaust pipe, the upper end of the outer cover is open, the inner container is arranged in the outer cover and is in a hollow cylinder shape, the inner container comprises a round pipe and two end plates, the end plates are formed at the corresponding ends of the round pipe through edge covering, and the exhaust pipe is arranged in the round pipe. The axis of the round pipe is arranged in the horizontal direction, a flange is arranged at the upper end of the exhaust pipe, the lower end of the exhaust pipe extends into the round pipe, an air outlet hole is formed in the portion, extending into the round pipe, of the exhaust pipe, an inner exhaust hole is formed in one end plate, and an outer exhaust hole corresponding to the inner exhaust hole in position is formed in the outer cover. The utility model has the advantages of no need of stretching, high percent of pass, few materials, low cost and strong market competitiveness.

Description

Technical fields:

[0001] This utility model belongs to the field of muffler technology, and specifically refers to a general-purpose gasoline engine muffler. Background technology:

[0002] A silencer is a device that allows airflow while blocking or reducing the propagation of sound. It is an important measure to eliminate aerodynamic noise. Silencers can block the propagation of sound waves while allowing airflow, making them an effective tool for noise control.

[0003] Chinese utility model patent (publication number CN203978577U, application date 2024.07.21, publication date 2014.12.03) discloses a small gasoline engine muffler mounted under the casing, including an outer cover, an inner liner, and a downward-suspended exhaust pipe. The inner liner is disposed inside the outer cover. Both ends of the downward-suspended exhaust pipe are provided with flanges, and the flanges near the outer cover have several through holes. Several bolts are provided on the top of the inner liner, and the bolts are corresponding to the through holes. The outer cover has a cubic structure. The bolts are welded to the top of the inner liner. Both the outer cover and the inner liner have air inlets and exhaust outlets. (See attached specification.) Figure 1-3 It can be clearly seen that the inner liner has a cubic structure, including an upper cover and a lower cover, which are connected by an edge.

[0004] The shortcomings of the above-mentioned mufflers are: the upper and lower covers are too deep, making them difficult to stretch and form, resulting in a low pass rate and high cost. Summary of the Invention:

[0005] The purpose of this invention is to provide a universal gasoline engine muffler that does not require stretching, has a high pass rate, low cost, and strong market competitiveness.

[0006] This utility model is implemented as follows:

[0007] A general-purpose gasoline engine muffler includes an outer cover, an inner liner, and an exhaust pipe. The outer cover has an open top, and the inner liner is disposed inside the outer cover and is a hollow cylindrical shape. The inner liner includes a circular tube and two end plates. The end plates are formed by edging at the corresponding ends of the circular tube. The axis of the circular tube is arranged in a horizontal direction. The exhaust pipe has a flange at its upper end and extends into the circular tube at its lower end. The part of the exhaust pipe extending into the circular tube has an exhaust port. One of the end plates has an internal exhaust port. The outer cover has an external exhaust port corresponding to the position of the internal exhaust port.

[0008] In the aforementioned general-purpose gasoline engine muffler, the diameter of the external exhaust port is larger than the diameter of the internal exhaust port.

[0009] In the above-mentioned general-purpose gasoline engine muffler, the upper wall of the round tube is provided with a through hole for the exhaust pipe to extend into. The wall of the exhaust pipe is fixed to the wall of the through hole by welding. The bottom of the exhaust pipe is closed and fixed to the lower wall of the round tube by welding.

[0010] In the aforementioned general-purpose gasoline engine muffler, both ends of the round tube are bent inward to form an outer rim that wraps around the outer ring of the end plate.

[0011] In the above-mentioned general-purpose gasoline engine muffler, the internal exhaust port has a bracket, the bracket includes a support ring and a plurality of circumferentially distributed support bars, the support ring is disposed inside the internal exhaust port, one end of the support bar is connected to the support ring and the other end is connected to the hole wall of the internal exhaust port, and an exhaust gap is formed between the inner ring of the support ring and between two adjacent support bars.

[0012] In the aforementioned general-purpose gasoline engine muffler, the exhaust gap is formed by stamping.

[0013] In the aforementioned general-purpose gasoline engine muffler, the inner liner does not protrude from the upper surface of the outer cover.

[0014] In the aforementioned general-purpose gasoline engine muffler, the outer diameter of the circular tube is 52-54 mm.

[0015] In the aforementioned general-purpose gasoline engine muffler, the outer cover includes a base plate, a front side plate, a rear side plate, a left side plate, and a right side plate. The bottom of the circular tube is fixed to the base plate of the outer cover by welding. The middle part of the front side plate is bent inward to form a connecting plate. The upper end of the connecting plate is fixed to the circular tube by welding.

[0016] In the aforementioned general-purpose gasoline engine muffler, the bottom of the exhaust pipe is closed, the air outlet is located on the side wall of the exhaust pipe, and there are two or more rows of air outlets evenly distributed around the circumference, with each row having two or more air outlets.

[0017] The outstanding advantages of this utility model compared to the prior art are:

[0018] 1. The inner liner of this utility model includes a round tube and two end plates. The round tube can be purchased from general-purpose pipes and cut to the required length without stretching, resulting in a high pass rate, low cost, and strong market competitiveness. In addition, the inner liner is a hollow cylindrical shape, with a small surface area, which means less material and lower cost. At the same time, the lower end of the exhaust pipe extends into the round tube, allowing the exhaust gas to enter the inner liner better, resulting in good noise reduction and sound absorption effects.

[0019] 2. The exhaust pipe wall of this utility model is fixed to the hole wall of the through hole by welding. The bottom of the exhaust pipe is closed and fixed to the lower pipe wall of the round pipe by welding. The exhaust pipe is firmly and reliably fixed, and the installation steps are few, which makes it easy to install, with high production efficiency and low labor cost.

[0020] 3. The bottom of the circular tube of this utility model is fixed to the bottom plate of the outer cover by welding. The middle part of the front side plate is bent inward to form a connecting plate. The upper end of the connecting plate is fixed to the circular tube by welding. The structure is simple, easy to install and process, and the connection is firm and reliable. Attached image description:

[0021] Figure 1 This is a three-dimensional representation of the present invention. Figure 1 ;

[0022] Figure 2 This is a three-dimensional representation of the present invention. Figure 2 ;

[0023] Figure 3 This is a front view of the end plate with internal exhaust holes of this utility model;

[0024] Figure 4 This is a perspective view of the exhaust pipe of this utility model.

[0025] Reference numerals: 1. Outer cover; 2. Inner liner; 21. Round tube; 22. End plate; 23. Outer edging; 3. Exhaust pipe; 4. Flange; 5. Vent hole; 6. Internal exhaust hole; 7. External exhaust hole; 8. Bracket; 81. Support ring; 82. Support bar; 9. Connecting plate. Detailed implementation method:

[0026] The present invention will be further described below with reference to specific embodiments. See also: Figure 1 —4:

[0027] A general-purpose gasoline engine muffler includes an outer cover 1, an inner liner 2, and an exhaust pipe 3. The outer cover 1 is open at the top, and the inner liner 2 is disposed inside the outer cover 1 and is in the form of a hollow cylinder. The inner liner 2 includes a circular tube 21 and two end plates 22. The end plates 22 are formed by edging at the corresponding ends of the circular tube 21. The axis of the circular tube 21 is arranged in the horizontal direction. The exhaust pipe 3 has a flange 4 at the upper end and extends into the circular tube 21 at the lower end. The part of the exhaust pipe 3 extending into the circular tube 21 has an exhaust port 5. One of the end plates 22 has an internal exhaust port 6. The outer cover 1 has an external exhaust port 7 corresponding to the position of the internal exhaust port 6.

[0028] like Figure 1-4As shown, the working principle of this utility model is as follows: the flange 4 of the exhaust pipe 3 is installed on the gasoline engine. The exhaust gas generated by the gasoline engine enters the inner liner 2 through the exhaust pipe 3 and the exhaust port 5. After the exhaust gas is reduced in noise and silenced in the inner liner 2, it is discharged through the inner exhaust port 6 and the outer exhaust port 7.

[0029] The inner liner 2 of this utility model includes a circular tube 21 and two end plates 22. The circular tube 21 can be purchased from general-purpose tubing and cut to the required length without stretching, resulting in a high pass rate, low cost, and strong market competitiveness. Moreover, the inner liner 2 is a hollow cylindrical shape. When it has the same volume as the existing cubic inner liner, the cylindrical inner liner 2 of this utility model has a smaller surface area, that is, less material and lower cost. At the same time, the lower end of the exhaust pipe 3 extends into the circular tube 21, allowing the exhaust gas to enter the inner liner 2 better, resulting in good noise reduction and sound absorption. In addition, the upper end of the outer cover 1 of this utility model is open, so the exhaust pipe 3 does not need to be connected to the outer cover 1, nor does it need to be provided with an air inlet on the outer cover 1.

[0030] Furthermore, the diameter of the external exhaust hole 7 is larger than the diameter of the internal exhaust hole 6.

[0031] Installation structure of inner liner 2 and exhaust pipe 3: The upper wall of the round pipe 21 is provided with a through hole for the exhaust pipe 3 to extend into. The pipe wall of the exhaust pipe 3 is fixed to the hole wall by welding. The bottom of the exhaust pipe 3 is closed, and the bottom of the exhaust pipe 3 is fixed to the lower wall of the round pipe 21 by welding. The exhaust pipe 3 is fixed firmly and reliably. Figure 1 In the middle, the raised ring between the exhaust pipe 3 and the round pipe 21 is a welding mark.

[0032] The installation process of the inner liner 2 and the exhaust pipe 3 is as follows: A through hole is drilled in the upper wall of the round pipe 21, and a small hole is drilled in the lower wall of the round pipe 21. The bottom of the exhaust pipe 3 is then welded to the wall of the small hole, and the small hole is sealed. Next, the wall of the exhaust pipe 3 is welded to the wall of the through hole. This requires only three steps. Compared to existing technologies, which require first welding bolts to the top of the inner liner, drilling holes in the flange and outer cover, then passing the bolts through the through hole in the flange, and finally securing them with nuts, requiring four steps, this invention has fewer process steps, is easier to install, has higher production efficiency, and lower labor costs.

[0033] Furthermore, the through holes and small holes on the round tube 21 are drilled using plasma or laser drilling. The round tube 21 is then cut to the required length using laser or plasma cutting. The drilling process of the round tube 21 and the cutting of the tube are completed on the same machine tool. This results in fewer processes, less turnover, high production efficiency, and low cost.

[0034] In this embodiment, the drilling process of the circular tube 21 and the cutting of the tube are both completed using a plasma cutting machine, and are completed on the same plasma cutting machine.

[0035] Furthermore, both ends of the circular tube 21 are bent inward to form an outer edge 23 that wraps around the outer ring of the end plate 22.

[0036] To prevent impurities from entering the inner liner 2, and for better sound damping, such as Figure 1 , 3 As shown, the internal exhaust hole 6 has a bracket 8 inside. The bracket 8 includes a support ring 81 and a plurality of circumferentially distributed support bars 82. The support ring 81 is disposed inside the internal exhaust hole 6. One end of the support bar 82 is connected to the support ring 81 and the other end is connected to the hole wall of the internal exhaust hole 6. An air outlet gap is formed between the inner ring of the support ring 81 and between two adjacent support bars 82.

[0037] Furthermore, the air outlet gap is formed by stamping, which is a simple process and easy to process.

[0038] Preferably, the inner liner 2 does not protrude from the upper surface of the outer cover 1.

[0039] Preferably, the outer diameter of the circular tube 21 is 52-54 mm. In this embodiment, the outer diameter of the circular tube 21 is 53 mm and the thickness is 0.7 mm. The circular tube 21 of this invention has a small outer diameter, requires less material, and has low cost.

[0040] The structure of the outer cover 1, and the connection structure between the outer cover 1 and the inner liner 2: as follows Figure 1 , 2 As shown, the outer cover 1 includes a bottom plate, a front side plate, a rear side plate, a left side plate, and a right side plate. The bottom of the round tube 21 is fixed to the bottom plate of the outer cover 1 by welding. The middle part of the front side plate is bent inward to form a connecting plate 9. The upper end of the connecting plate 9 is fixed to the round tube 21 by welding. The structure is simple, easy to install and process, and the connection is firm and reliable. Figure 1 In the middle, the protrusion between the connecting plate 9 and the round tube 21 is the weld point. Figure 2 In the middle, the protrusions in the two grooves at the bottom of the outer cover 1 are the welding points.

[0041] Installation process of outer cover 1 and inner liner 2: First, drill a hole at the bottom of outer cover 1. Then, bend the middle part of the front side plate of outer cover 1 inward to form connecting plate 9. Then, weld the bottom of the round tube 21 to the hole wall of outer cover 1 and seal the hole. Finally, weld the upper end of connecting plate 9 to round tube 21.

[0042] For better ventilation, such as Figure 4 As shown, the bottom of the exhaust pipe 3 is closed, the air outlet 5 is provided on the side wall of the exhaust pipe 3, and the air outlet 5 is evenly distributed in two or more rows around the circumference, with each row having two or more air outlets 5.

[0043] In this embodiment, the air outlets 5 are evenly distributed in 4 rows around the circumference, with 4 air outlets 5 in each row, and 16 air outlets 5 on each exhaust pipe 3.

[0044] The above embodiments are only one of the preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes made in accordance with the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. A general-purpose gasoline engine muffler, comprising an outer casing (1), an inner liner (2), and an exhaust pipe (3), characterized in that: The outer cover (1) has an opening at the top, and the inner liner (2) is set inside the outer cover (1) and is a hollow cylindrical shape. The inner liner (2) includes a round tube (21) and two end plates (22). The end plates (22) are formed by edging at the corresponding ends of the round tube (21). The axis of the round tube (21) is set in the horizontal direction. The exhaust pipe (3) has a flange (4) at the top and extends into the round tube (21) at the bottom. The part of the exhaust pipe (3) that extends into the round tube (21) has an exhaust hole (5). One of the end plates (22) has an internal exhaust hole (6). The outer cover (1) has an external exhaust hole (7) corresponding to the position of the internal exhaust hole (6).

2. The muffler for a general-purpose gasoline engine according to claim 1, characterized in that: The upper wall of the circular tube (21) is provided with a through hole for the exhaust pipe (3) to extend into. The wall of the exhaust pipe (3) is fixed to the wall of the through hole by welding. The bottom of the exhaust pipe (3) is closed, and the bottom of the exhaust pipe (3) is fixed to the lower wall of the circular tube (21) by welding.

3. A general-purpose gasoline engine muffler according to claim 1, characterized in that: The two ends of the circular tube (21) are bent inward to form the outer edge (23) of the outer ring of the end plate (22).

4. A general-purpose gasoline engine muffler according to claim 1, characterized in that: The internal exhaust port (6) has a bracket (8) inside. The bracket (8) includes a support ring (81) and a plurality of circumferentially distributed support bars (82). The support ring (81) is set inside the internal exhaust port (6). One end of the support bar (82) is connected to the support ring (81) and the other end is connected to the hole wall of the internal exhaust port (6). An exhaust gap is formed between the inner ring of the support ring (81) and between two adjacent support bars (82).

5. A general-purpose gasoline engine muffler according to claim 4, characterized in that: The air outlet gap is formed by stamping.

6. A general-purpose gasoline engine muffler according to claim 1, characterized in that: The inner liner (2) does not protrude from the upper surface of the outer cover (1).

7. A general-purpose gasoline engine muffler according to claim 6, characterized in that: The outer diameter of the circular tube (21) is 52-54 mm.

8. A general-purpose gasoline engine muffler according to claim 1, characterized in that: The outer cover (1) includes a bottom plate, a front side plate, a rear side plate, a left side plate and a right side plate. The bottom of the round tube (21) is fixed to the bottom plate of the outer cover (1) by welding. The middle part of the front side plate is bent inward to form a connecting plate (9). The upper end of the connecting plate (9) is fixed to the round tube (21) by welding.

9. A general-purpose gasoline engine muffler according to claim 1, characterized in that: The bottom of the exhaust pipe (3) is closed, and the air outlet (5) is set on the side wall of the exhaust pipe (3). The air outlet (5) is evenly distributed in two or more rows around the circumference, and each row is provided with two or more air outlets (5).

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