Exhaust silencing device for engineering vehicle

Abstract

The utility model belongs to the technical field of vehicle exhaust, and particularly relates to an engineering vehicle exhaust silencing device which comprises an outer barrel and an inner barrel. The two sides of the surface of the outer cylinder communicate with an air inlet pipe and an air outlet pipe correspondingly, a first partition disc and a second partition disc are fixedly connected to the positions, between the air inlet pipe and the air outlet pipe, of the inner wall of the inner cylinder correspondingly, and a first cavity is formed between one side of the first partition disc and one side of the interior of the inner cylinder. A second cavity is formed between the second partition disc and one side of the first partition disc, a third cavity is formed between the second partition disc and one side, away from the first cavity, of the interior of the inner barrel, and the top of one side of the second partition disc is fixedly connected with an air guide hole pipe. And by arranging the spiral wave gas guide plate, when the smoke is expanded in the second cavity, the smoke can be orderly guided to a certain extent under the high-temperature condition, rapid diffusion of the smoke is avoided, and the silencing effect is improved.

Description

Technical Field

[0001] This utility model belongs to the field of vehicle exhaust technology, specifically a muffler for engineering vehicle exhaust. Background Technology

[0002] The vehicle exhaust system is a key device for discharging engine exhaust gases, reducing pollution, and lowering noise. Its components include the exhaust manifold, exhaust pipe, catalytic converter, muffler, and exhaust tailpipe. The muffler in the exhaust system can reduce the noise generated during exhaust gas emission and improve driving comfort.

[0003] Existing mufflers reduce exhaust noise by using various acoustic elements and designs, such as straight pipes, perforated plates, resonant cavities, sound-absorbing cotton, and thickened exhaust tailpipes, to reduce the flow velocity of exhaust gas. Common mufflers include resistive mufflers, reactive mufflers, and impedance composite mufflers.

[0004] Currently, existing technologies rely on mufflers for single-stage noise reduction. While this method can reduce noise to some extent during exhaust processes, the high temperature of the flue gas means that as the medium for noise propagation, the higher the temperature, the faster the sound travels. This reduces the effective expansion time of each stage, thus affecting the noise reduction effect.

[0005] Therefore, a muffler for exhaust gas of engineering vehicles is proposed to address the above problems. Utility Model Content

[0006] To overcome the shortcomings of existing technologies and address the problem that the high temperature of the flue gas, when used as a medium for noise transmission, leads to faster sound propagation due to higher temperatures, which reduces the effective expansion time of each expansion and affects the silencing effect, a new exhaust muffler for engineering vehicles is proposed.

[0007] The technical solution adopted by this utility model to solve its technical problem is as follows: The exhaust muffler of an engineering vehicle according to this utility model includes an outer cylinder and an inner cylinder; an air inlet pipe and an exhaust pipe are respectively connected to both sides of the surface of the outer cylinder; a first partition and a second partition are respectively fixedly connected to the inner wall of the inner cylinder at the position between the air inlet pipe and the exhaust pipe; a first cavity is formed between one side of the first partition and one side of the inner cylinder; a second cavity is formed between the second partition and one side of the first partition; a third cavity is formed between the second partition and the side of the inner cylinder away from the first cavity; an air guide pipe is fixedly connected to the top of one side of the second partition; one end of the air guide pipe passes through the first partition and extends into the interior of the first cavity; an air outlet inner pipe is fixedly connected to the center of one side of the first partition; a spiral wave air guide plate is sleeved on the surface of the air outlet inner pipe and the air guide pipe and inside the second cavity; the two sides of the spiral wave air guide plate are respectively fixedly connected to the surfaces of the first partition and the second partition.

[0008] Preferably, the air inlet pipe penetrates the outer cylinder, the inner cylinder, and the first cavity, and the exhaust pipe penetrates the outer cylinder, the inner cylinder, and the third cavity. Arc-shaped sealing plates are fixedly connected to both sides of the surface of the air inlet pipe and the exhaust pipe and to the surface of the outer cylinder.

[0009] Preferably, a heat insulation cavity is formed between the surfaces of the outer cylinder and the inner cylinder, the exhaust pipe has a silencer hole only in the part inside the third cavity, and the air inlet pipe has silencer holes in both the parts inside the first cavity and the heat insulation cavity.

[0010] Preferably, the interior of the heat insulation cavity is filled with annular heat insulation cotton and disc-shaped heat insulation cotton, and multiple circumferentially arranged exhaust ports are opened on one side of the inner cylinder and at the position of the first cavity. Multiple exhaust pipes are connected to the inner wall of the inner cylinder at the position of the first cavity.

[0011] Preferably, one end of both the air inlet pipe and the air outlet pipe is connected to a connecting flange, and the ends of both the air inlet pipe and the air outlet pipe away from the connecting flange are sealed.

[0012] Preferably, a lifting lug is fixedly connected to one side of the outer cylinder surface, an arc-shaped support frame is fixedly connected to the surface of the outer cylinder, and a support leg is fixedly connected to the bottom of the arc-shaped support frame.

[0013] The beneficial effects of this utility model are:

[0014] This utility model provides an exhaust muffler for engineering vehicles. By setting a spiral wave air guide plate, the exhaust gas can be guided in an orderly manner to a certain extent when it expands in the second cavity, so as to avoid rapid diffusion of exhaust gas and improve the muffler effect.

[0015] This utility model provides an exhaust muffler for engineering vehicles. By setting up a heat insulation cavity filled with annular and disc-shaped heat insulation cotton, the exhaust gas can diffuse into the heat insulation cavity when it enters the first cavity. The annular and disc-shaped heat insulation cotton are used for heat insulation, which can reduce the temperature of the gas inside the inner cylinder to a certain extent, reduce the diffusion speed of the exhaust gas, and further improve the muffler effect. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0017] Figure 1 This is a perspective view of the present invention;

[0018] Figure 2 This is a perspective view of the transverse cross-sectional structure of this utility model;

[0019] Figure 3 This is a cross-sectional view of the internal structure of the first cavity in this utility model;

[0020] Figure 4 This is a perspective view of the first partition plate connection structure in this utility model;

[0021] Figure 5 This is a perspective view of the air inlet pipe and the air outlet pipe in this utility model;

[0022] Figure 6 This is a perspective view of the annular heat insulation cotton and the disc-shaped heat insulation cotton in this utility model;

[0023] Legend:

[0024] 1. Outer cylinder; 2. Inner cylinder; 3. Air inlet pipe; 4. Air outlet pipe; 5. First partition plate; 6. Second partition plate; 7. First cavity; 8. Second cavity; 9. Third cavity; 10. Air guide pipe; 11. Air outlet inner pipe; 12. Spiral corrugated air guide plate; 13. Arc-shaped sealing plate; 14. Insulation cavity; 15. Annular insulation cotton; 16. Disc-shaped insulation cotton; 17. Exhaust port; 18. Exhaust capillary tube; 19. Connecting flange; 20. Lifting lug; 21. Arc-shaped support frame; 22. Support leg. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0026] Specific implementation examples are given below.

[0027] Please see Figures 1-6 This utility model provides an exhaust muffler for engineering vehicles, including an outer cylinder 1 and an inner cylinder 2. An air inlet pipe 3 and an exhaust pipe 4 are respectively connected to both sides of the surface of the outer cylinder 1. A first partition 5 and a second partition 6 are fixedly connected to the inner wall of the inner cylinder 2, located between the air inlet pipe 3 and the exhaust pipe 4. A first cavity 7 is formed between one side of the first partition 5 and one side of the inner cylinder 2, and a second cavity 8 is formed between the second partition 6 and one side of the first partition 5. A third cavity 9 is formed between the inner cylinder 2 and the side away from the first cavity 7. A vent pipe 10 is fixedly connected to the top of one side of the second partition 6. One end of the vent pipe 10 passes through the first partition 5 and extends into the interior of the first cavity 7. An outlet pipe 11 is fixedly connected to the center of one side of the first partition 5. A spiral wave venting plate 12 is fitted onto the surface of the outlet pipe 11 and the vent pipe 10, and inside the second cavity 8. The two sides of the spiral wave venting plate 12 are respectively connected to the first partition 5 and... The surface of the second partition 6 is fixedly connected; during operation, the outer cylinder 1 and the inner cylinder 2 form a complete cylinder, and the flue gas is silenced inside the cylinder. The first partition 5 and the second partition 6 are fixed on the inner wall of the inner cylinder 2, thereby forming the inner cylinder 2 into a first cavity 7, a second cavity 8 and a third cavity 9. The flue gas enters the first cavity 7 through the air inlet pipe 3, expands in the first cavity 7, and eliminates some low- and mid-frequency noise. Then it enters the second cavity 8 through the air guide pipe 10, expands in the second cavity 8, and eliminates some high-frequency noise. At the same time, it flows along the spiral wave air guide plate 12 in the second cavity 8, and then enters the third cavity 9 through the air outlet pipe 11, expands in the third cavity 9, and eliminates some noise. Finally, some airflow is directly discharged from the exhaust pipe 4. By setting the spiral wave air guide plate 12, the flue gas can be guided in an orderly manner to a certain extent when it expands in the second cavity 8 at high temperature, avoiding rapid diffusion of flue gas and improving the silencer effect.

[0028] Furthermore, such as Figure 2 , Figure 3 and Figure 6As shown, the air inlet pipe 3 penetrates the outer cylinder 1, the inner cylinder 2, and the first cavity 7, and the exhaust pipe 4 penetrates the outer cylinder 1, the inner cylinder 2, and the third cavity 9. Arc-shaped sealing plates 13 are fixedly connected to both sides of the surface of the air inlet pipe 3 and the exhaust pipe 4 on the surface of the outer cylinder 1. A heat insulation cavity 14 is formed between the surfaces of the outer cylinder 1 and the inner cylinder 2. The exhaust pipe 4 has a silencing hole only in the part inside the third cavity 9. The air inlet pipe 3 has a silencing hole in the parts inside the first cavity 7 and the heat insulation cavity 14. The interior of the heat insulation cavity 14 is filled with annular heat insulation cotton 15 and disc-shaped heat insulation cotton 16, respectively. Multiple circumferentially arranged exhaust ports 17 are opened on one side of the inner cylinder 2 and on the side of the first cavity 7. Multiple exhaust thin pipes 18 are connected to the inner wall of the inner cylinder 2 at the position of the first cavity 7. During operation, the air inlet pipe 3 guides air, and the air inlet pipe 3 has silencer holes in the first cavity 7 and the heat insulation cavity 14, allowing the flue gas to be exhausted within the first cavity 7 and the heat insulation cavity 14. The exhaust pipe 4 has silencer holes in the third cavity 9, allowing the flue gas in the third cavity 9 to be exhausted through the silencer holes of the exhaust pipe 4. Additionally, the heat insulation cavity 14 is filled with annular heat insulation cotton 15 and disc-shaped heat insulation cotton 16, which insulate the flue gas entering the heat insulation cavity 14. Meanwhile, an exhaust port 1 is located in the first cavity 7. The exhaust pipe 7 and the exhaust cap 18 allow the flue gas to circulate within the first cavity 7 and the insulation cavity 14, thereby providing more insulation for the flue gas and improving the insulation effect. By setting up the insulation cavity 14 and filling it with annular insulation cotton 15 and disc-shaped insulation cotton 16, the flue gas can diffuse into the insulation cavity 14 when it enters the first cavity 7. The annular insulation cotton 15 and disc-shaped insulation cotton 16 provide insulation, which can reduce noise and provide heat insulation at the same time. This reduces the temperature of the gas inside the inner cylinder 2 to a certain extent, reduces the diffusion speed of the flue gas, and further improves the noise reduction effect.

[0029] Furthermore, such as Figure 1 and Figure 3 As shown, one end of the air inlet pipe 3 and the exhaust pipe 4 are connected to a connecting flange 19, and the ends of the air inlet pipe 3 and the exhaust pipe 4 away from the connecting flange 19 are sealed. A lifting lug 20 is fixedly connected to one side of the outer cylinder 1, and an arc-shaped support frame 21 is fixedly connected to the surface of the outer cylinder 1. A support leg 22 is fixedly connected to the bottom of the arc-shaped support frame 21. During operation, the connecting flange 19 is used to connect external pipes to ensure the stability of the connection, the lifting lug 20 is used for easy handling, the arc-shaped support frame 21 supports the outer cylinder 1, and the support leg 22 supports the arc-shaped support frame 21.

[0030] First, the outer cylinder 1 and the inner cylinder 2 form a complete cylinder. The flue gas is silenced inside the cylinder. The first partition 5 and the second partition 6 are fixed on the inner wall of the inner cylinder 2, thus forming the inner cylinder 2 into a first cavity 7, a second cavity 8, and a third cavity 9. The flue gas enters the first cavity 7 through the inlet pipe 3, where it expands and eliminates some low- and mid-frequency noise. Then, it enters the second cavity 8 through the guide pipe 10, where it expands and eliminates some high-frequency noise. At the same time, it flows along the spiral wave guide plate 12 in the second cavity 8. Then, it enters the third cavity 9 through the outlet pipe 11, where it expands and eliminates some noise. Finally, some of the airflow is directly discharged from the exhaust pipe 4. By setting the spiral wave guide plate 12, the flue gas can be guided in an orderly manner to a certain extent when it expands in the second cavity 8 at high temperatures, avoiding rapid diffusion of the flue gas and improving the silencing effect. Secondly, the air inlet pipe 3 can guide air, and the air inlet pipe 3 has silencer holes in the first cavity 7 and the heat insulation cavity 14, so that the flue gas can be exhausted in the first cavity 7 and the heat insulation cavity 14. The exhaust pipe 4 has silencer holes in the third cavity 9, so that the flue gas in the third cavity 9 can be exhausted through the silencer holes of the exhaust pipe 4. In addition, the heat insulation cavity 14 is filled with annular heat insulation cotton 15 and disc-shaped heat insulation cotton 16, which can insulate the flue gas entering the heat insulation cavity 14. At the same time, an exhaust port 1 is opened in the first cavity 7. The exhaust pipe 18 and the exhaust cap allow the flue gas to circulate within the first cavity 7 and the insulation cavity 14, thereby providing greater insulation and improving the insulation effect. The insulation cavity 14, filled with annular insulation cotton 15 and disc-shaped insulation cotton 16, allows the flue gas to diffuse into the insulation cavity 14 when entering the first cavity 7. The annular and disc-shaped insulation cotton 15 and 16 provide insulation, reducing noise while simultaneously lowering the temperature of the gas inside the inner cylinder 2, reducing the flue gas diffusion rate, and further improving the noise reduction effect. Finally, the connecting flange 19 is used for connecting external pipes to ensure a stable connection, the lifting lug 20 facilitates handling, the arc-shaped support frame 21 supports the outer cylinder 1, and the support legs 22 support the arc-shaped support frame 21.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A muffler for exhaust systems of engineering vehicles, characterized in that: The device includes an outer cylinder (1) and an inner cylinder (2). An air inlet pipe (3) and an exhaust pipe (4) are respectively connected to both sides of the surface of the outer cylinder (1). A first partition (5) and a second partition (6) are fixedly connected to the inner wall of the inner cylinder (2) at a position between the air inlet pipe (3) and the exhaust pipe (4). A first cavity (7) is formed between one side of the first partition (5) and one side of the inner cylinder (2). A second cavity (8) is formed between the second partition (6) and one side of the first partition (5). The second partition (6) is located away from the first cavity (7) inside the inner cylinder (2). A third cavity (9) is formed between the two sides of the first partition (5). A vent pipe (10) is fixedly connected to the top of one side of the second partition (6). One end of the vent pipe (10) passes through the first partition (5) and extends into the interior of the first cavity (7). An outlet pipe (11) is fixedly connected to the center of one side of the first partition (5). A spiral wave vent plate (12) is sleeved on the surface of the outlet pipe (11) and the vent pipe (10) and inside the second cavity (8). The two sides of the spiral wave vent plate (12) are fixedly connected to the surface of the first partition (5) and the second partition (6), respectively.

2. The exhaust muffler for engineering vehicles according to claim 1, characterized in that: The air inlet pipe (3) passes through the outer cylinder (1), the inner cylinder (2) and the first cavity (7), and the exhaust pipe (4) passes through the outer cylinder (1), the inner cylinder (2) and the third cavity (9). Arc-shaped sealing plates (13) are fixedly connected to both sides of the surface of the air inlet pipe (3) and the exhaust pipe (4) and to the surface of the outer cylinder (1).

3. The exhaust muffler for engineering vehicles according to claim 1, characterized in that: A heat insulation cavity (14) is formed between the surfaces of the outer cylinder (1) and the inner cylinder (2). The exhaust pipe (4) has a silencing hole only in the part inside the third cavity (9). The air inlet pipe (3) has silencing holes in both the part inside the first cavity (7) and the heat insulation cavity (14).

4. The exhaust muffler for engineering vehicles according to claim 3, characterized in that: The interior of the heat insulation cavity (14) is filled with annular heat insulation cotton (15) and disc-shaped heat insulation cotton (16). Multiple circumferentially arranged exhaust ports (17) are opened on one side of the inner cylinder (2) and on the side of the first cavity (7). Multiple exhaust pipes (18) are connected to the inner wall of the inner cylinder (2) at the position of the first cavity (7).

5. The exhaust muffler for engineering vehicles according to claim 1, characterized in that: One end of the air inlet pipe (3) and the exhaust pipe (4) are connected to a connecting flange (19), and the ends of the air inlet pipe (3) and the exhaust pipe (4) away from the connecting flange (19) are sealed.

6. The exhaust muffler for engineering vehicles according to claim 1, characterized in that: A lifting lug (20) is fixedly connected to one side of the surface of the outer cylinder (1), an arc-shaped support frame (21) is fixedly connected to the surface of the outer cylinder (1), and a support leg (22) is fixedly connected to the bottom of the arc-shaped support frame (21).

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