Engine power pack silencer

Abstract

The utility model discloses an engine power pack silencer which comprises an air inlet pipe connected with an engine power pack exhaust pipe, one end of the air inlet pipe penetrates into a first fixing cylinder, the flow direction of air is adjusted in the first fixing cylinder, the air is exhausted out of the first fixing cylinder along a communicating pipe and an air outlet pipe, and the air inlet pipe is communicated with the communicating pipe. When the airflow is subjected to silencing treatment through the first fixed cylinder, the airflow passes through the second fixed cylinder, but the noise enters the space between the first partition plate and the second partition plate through the first through hole, the strength of sound waves is weakened through rebound of the sound waves, and meanwhile the sound waves in different time periods interact in the first fixed cylinder and can be counteracted; the air outlet pipe communicates with the space divided by the third partition plate through a third through hole, due to the fact that the widths of the multiple sets of spaces are different, sound waves with different frequencies are counteracted in cooperation with an internal elastic piece, and therefore multi-frequency noise is eliminated, and noise generated by an engine power pack is reduced.

Description

Technical Field

[0001] This utility model relates to the field of noise reduction technology, specifically to an engine power pack muffler. Background Technology

[0002] An engine power pack is an integrated power solution, typically referring to a modular unit that integrates an engine, a matching transmission, and related auxiliary components. It is designed to provide a complete, efficient, and easy-to-install power output system for various types of equipment, and is widely used in automobiles, construction machinery, ships, generator sets, agricultural machinery, and other fields.

[0003] The main source of noise in an engine power pack is the engine's exhaust pipe. A muffler is usually installed at the end of the exhaust pipe to eliminate the roaring sound of airflow within the exhaust pipe. However, because the sound waves in the exhaust pipe vibrate at different frequencies, traditional mufflers cannot completely eliminate sound waves of multiple frequencies. Utility Model Content

[0004] The purpose of this utility model is to provide an engine power pack muffler. Based on the traditional muffler, it is further provided with a second fixed cylinder. The interior of the second fixed cylinder is divided into an independent air storage chamber by a third partition plate. When sound waves enter, the frequency of the sound waves matches the inherent frequency of the air to generate a resonant frequency, which then drives the elastic sheet to vibrate, thereby eliminating the vibration generated by the sound waves and achieving the purpose of noise reduction, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an engine power pack muffler, comprising:

[0006] An intake pipe connected to the exhaust pipe of the engine power pack has one end extending into a first fixed cylinder. The inner cavity of the first fixed cylinder is fixed with a first partition plate and a second partition plate, which divide the inner cavity of the first fixed cylinder into a first chamber, a second chamber, and a third chamber. One end of the intake pipe is located in the third chamber. An exhaust pipe and a connecting pipe are fixedly connected to both the first and second partition plates. The two ends of the connecting pipe are located in the first chamber and the third chamber, respectively. One end of the exhaust pipe is located in the first chamber, and the other end of the exhaust pipe extends outward through the first fixed cylinder. A second fixed cylinder for further noise reduction is fixed to the outside of the exhaust pipe.

[0007] The first fixed cylinder, the first partition plate, and the second partition plate are all provided with cavities, and the cavities are filled with sound-absorbing filler.

[0008] Preferably, the outer side of the air intake pipe has multiple sets of first through holes, and the first through holes are connected to the second chamber.

[0009] Preferably, a second through hole is provided on the opposite side of the first partition plate and the second partition plate, and the second through hole communicates with the cavity.

[0010] Preferably, the inner cavity of the second fixed cylinder is fixed with multiple sets of unequally spaced third partition plates, the third partition plates are fixed on the outside of the air outlet pipe, the inner wall of the second fixed cylinder is fixed with multiple sets of elastic plates, the elastic plates are movably sleeved on the outside of the air outlet pipe, and the air outlet pipe is provided with multiple sets of third through holes at one end of the inner cavity of the second fixed cylinder, the third through holes are located on both sides of the third partition plates.

[0011] Preferably, the first fixed cylinder includes a cylinder body and a lid, one end of the cylinder body is provided with a connecting flange, and the lid is locked to the connecting flange by bolts and nuts.

[0012] Preferably, a ring is fixed to one side of the bucket lid, and the ring is embedded in the cavity inside the bucket body.

[0013] Preferably, the sound-absorbing filler includes glass wool, rock wool, and metal wire mesh, which are laid alternately.

[0014] Preferably, the distance between each group of elastic sheets and the adjacent third partition plate is different.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This utility model adjusts the gas flow direction inside the first fixed cylinder, allowing the gas to exit the first fixed cylinder along the connecting pipe and the outlet pipe. However, noise will enter between the first and second partition plates through the first through hole. The intensity of the sound wave is weakened by the rebound of the sound wave. At the same time, the sound waves at different time periods can interact and cancel each other out inside the first fixed cylinder. When the airflow after being silenced by the first fixed cylinder flows through the second fixed cylinder, the outlet pipe connects with the space divided by the third partition plate through the third through hole. Since the widths between the multiple spaces are different, the internal elastic plates cancel out the sound waves of different frequencies, thereby eliminating multi-frequency noise and reducing the noise generated by the engine power pack.

[0017] 2. This utility model limits the types of sound-absorbing filling materials and utilizes a variety of sound-absorbing materials to absorb noise, thereby improving the noise reduction effect. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a cross-sectional perspective view of the first fixed cylinder of this utility model.

[0020] Figure 3 This is a three-dimensional structural diagram of the first partition plate and the sound-absorbing filler of this utility model;

[0021] Figure 4 This is a cross-sectional three-dimensional structural diagram of the second fixed cylinder of this utility model.

[0022] The following are the labels in the diagram: 1. Inlet pipe; 2. First partition plate; 3. Second partition plate; 4. First chamber; 5. Second chamber; 6. Third chamber; 7. Outlet pipe; 8. Connecting pipe; 9. Second fixed cylinder; 10. Cavity; 11. Sound-absorbing filling material; 12. First through hole; 13. Second through hole; 14. Third partition plate; 15. Elastic sheet; 16. Third through hole; 17. First fixed cylinder; 18. Cylinder body; 19. Cylinder lid; 20. Connecting flange; 21. Ring. Detailed Implementation

[0023] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] This utility model provides, for example Figures 1-4 An engine power pack muffler shown includes:

[0025] An intake pipe 1 is connected to the exhaust pipe of the engine power pack. One end of the intake pipe 1 extends into the first fixed cylinder 17. The inner cavity of the first fixed cylinder 17 is fixed with a first partition plate 2 and a second partition plate 3. The first partition plate 2 and the second partition plate 3 divide the inner cavity of the first fixed cylinder 17 into a first chamber 4, a second chamber 5 and a third chamber 6. One end of the intake pipe 1 is located in the third chamber 6. An exhaust pipe 7 and a connecting pipe 8 are fixedly connected to both the first partition plate 2 and the second partition plate 3. The two ends of the connecting pipe 8 are located in the first chamber 4 and the third chamber 6, respectively. One end of the exhaust pipe 7 is located in the first chamber 4. The other end of the exhaust pipe 7 extends outward through the first fixed cylinder 17. A second fixed cylinder 9 for further noise reduction is fixed on the outside of the exhaust pipe 7.

[0026] The first fixed cylinder 17, the first partition plate 2, and the second partition plate 3 are all provided with cavities 10, and the cavities 10 are filled with sound-absorbing filler 11.

[0027] By adjusting the gas flow direction inside the first fixed cylinder 17, the gas is discharged from the first fixed cylinder 17 along the connecting pipe 8 and the exhaust pipe 7. However, noise will enter between the first partition plate 2 and the second partition plate 3 through the first through hole 12. The intensity of the sound wave is weakened by the rebound of the sound wave. At the same time, the sound waves at different time periods interact and cancel each other inside the first fixed cylinder 17. When the airflow after being silenced by the first fixed cylinder 17 flows through the second fixed cylinder 9, the exhaust pipe 7 is connected to the space divided by the third partition plate 14 through the third through hole 16. Since the widths between the multiple spaces are different, the internal elastic sheet 15 cancels out the sound waves of different frequencies, thereby eliminating multi-frequency noise and reducing the noise generated by the engine power pack.

[0028] Among them, such as Figure 2 As shown:

[0029] Multiple sets of first through holes 12 are opened on the outer side of the air intake pipe 1, and the first through holes 12 are connected to the second chamber 5. The air intake pipe 1 and the second chamber 5 are connected through the first through holes 12. When the sound wave enters the second chamber 5, it is repeatedly reflected between the first partition plate 2 and the second partition plate 3, forming multiple reflection paths. When the reflection paths of the two sets of sound waves are opposite, they can be canceled out, thereby eliminating the sound wave.

[0030] Furthermore, such as Figure 3 As shown:

[0031] A second through hole 13 is provided on the opposite side of the first partition plate 2 and the second partition plate 3. The second through hole 13 is connected to the cavity 10. Through the setting of the second through hole 13, the second chamber 5 is connected to the cavity 10 inside the second partition plate 3 and the first partition plate 2, so that the sound wave enters the cavity 10 through the second through hole 13, causing the sound-absorbing filling material 11 to vibrate, and eliminating the vibration of the sound wave through energy conversion.

[0032] Preferred, such as Figure 4 As shown:

[0033] Multiple sets of unequally spaced third partition plates 14 are fixed inside the second fixed cylinder 9. The third partition plates 14 are fixed to the outside of the air outlet pipe 7. Multiple sets of elastic plates 15 are fixed on the inner wall of the second fixed cylinder 9. The elastic plates 15 are movably sleeved on the outside of the air outlet pipe 7. Multiple sets of third through holes 16 are opened at one end of the air outlet pipe 7 located inside the second fixed cylinder 9. The third through holes 16 are located on both sides of the third partition plates 14. The second fixed cylinder 9 is divided into multiple spaces by the third partition plates 14. Elastic plates 15 are installed at different positions inside each space. When sound waves pass through the third through holes 16 and are repeatedly reflected between the elastic plates 15 and the third partition plates 14, the elastic plates 15 are deformed, and the energy of the sound wave vibration is absorbed.

[0034] It is worth noting that, such as Figure 2 As shown:

[0035] The first fixed cylinder 17 includes a cylinder body 18 and a lid 19. A connecting flange 20 is provided at one end of the cylinder body 18. The lid 19 and the connecting flange 20 are locked together by bolts and nuts. The lid 19 and the cylinder body 18 are connected by the connecting flange 20 and then locked together by bolts and nuts. This facilitates the disassembly and assembly of the lid 19 and the cylinder body 18, and the filling of the sound-absorbing filling material 11 in the cavity 10 inside the cylinder body 18.

[0036] In a further preferred embodiment, such as Figure 2 As shown:

[0037] A ring 21 is fixed on one side of the lid 19. The ring 21 is embedded in the cavity 10 inside the cylinder 18. By fixing the ring 21 on the lid 19, the ring 21 is secured in the cavity 10 of the cylinder 18 to support the structure of the cylinder 18 and ensure the stability of the cylinder 18.

[0038] In addition, such as Figure 3 As shown:

[0039] The sound-absorbing filler 11 includes glass wool, rock wool, and metal wire mesh, which are laid alternately. By limiting the types of sound-absorbing filler 11, multiple sound-absorbing materials are used to absorb noise and improve the noise reduction effect.

[0040] In this embodiment, as Figure 4 As shown:

[0041] Each set of elastic plates 15 is at a different distance from the adjacent third partition plate 14. By limiting the distance between the elastic plates 15 and the third partition plate 14, an air storage chamber is formed between the elastic plates 15 and the third partition plate 14, forming a natural frequency. When different sound wave frequencies in the noise sound wave are the same as the natural frequency, a resonant frequency is formed, thereby eliminating sound waves of a specific frequency. Therefore, since the distances between multiple sets of elastic plates 15 and the third partition plate 14 are different, noise of multiple frequencies can be eliminated.

[0042] In practical use, the noise and exhaust gas generated by combustion in the engine are introduced into the first fixed cylinder 17 through the intake pipe 1. When the exhaust gas flows in the intake pipe 1, it first passes through the first through hole 12. Because the second chamber 5 between the first partition plate 2 and the second partition plate 3 is relatively independent, the gas cannot diffuse into the second chamber 5 through the first through hole 12. Instead, it flows into the third chamber 6 along the intake pipe 1. Subsequently, the exhaust gas in the third chamber 6 is transferred to the first chamber 4 through the connecting pipe 8, and finally flows directly out of the first chamber 4 through the exhaust pipe 7. The noise is actually a vibration sound wave. The sound wave enters the second chamber 5 between the first partition plate 2 and the second partition plate 3 through the first through hole 12, and is reflected between the first partition plate 2 and the second partition plate 3, slowly... Losing energy, the interaction of two opposing sound waves can cancel each other out, which is the main noise reduction method of the silencer. When some sound waves enter the cavity 10 inside the first partition plate 2 and the second partition plate 3 through the second through hole 13, the sound wave vibration drives the vibration of the air inside the sound-absorbing filling material 11. Through friction and heat generation, the energy is converted and the energy of the sound wave vibration is reduced. Similarly, the energy of the sound waves is reduced when they bounce in the third chamber 6 and the first chamber 4. At the same time, when the gas discharged from the exhaust pipe 7 flows through the second fixed cylinder 9, the noise sound wave enters the space between the third partition plates 14 through the third through hole 16 and bounces on the inner wall, driving the vibration of the air. The vibration of the air drives the elastic plate 15 to vibrate, so that the elastic plate 15 eliminates the sound wave energy.

[0043] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An engine power pack muffler, characterized in that, include: An intake pipe (1) is connected to the exhaust pipe of the engine power pack. One end of the intake pipe (1) extends into the first fixed cylinder (17). The inner cavity of the first fixed cylinder (17) is fixed with a first partition plate (2) and a second partition plate (3). The first partition plate (2) and the second partition plate (3) divide the inner cavity of the first fixed cylinder (17) into a first chamber (4), a second chamber (5) and a third chamber (6), and one end of the intake pipe (1) is located in the third chamber (6). The first partition plate (2) and the second partition plate (3) are both fixedly connected with an air outlet pipe (7) and a connecting pipe (8). The two ends of the connecting pipe (8) are located in the first chamber (4) and the third chamber (6) respectively. One end of the air outlet pipe (7) is located in the first chamber (4). The other end of the air outlet pipe (7) passes through the first fixed cylinder (17) and extends outward. A second fixed cylinder (9) for further noise reduction is fixed on the outside of the air outlet pipe (7). The first fixed cylinder (17), the first partition plate (2) and the second partition plate (3) are all provided with cavities (10), and the cavities (10) are filled with sound-absorbing filler (11).

2. The engine power pack muffler according to claim 1, characterized in that: The air intake pipe (1) has multiple sets of first through holes (12) on its outer side, and the first through holes (12) are connected to the second chamber (5).

3. The engine power pack muffler according to claim 1, characterized in that: A second through hole (13) is provided on the opposite side of the first partition plate (2) and the second partition plate (3), and the second through hole (13) is connected to the cavity (10).

4. The engine power pack muffler according to claim 1, characterized in that: The inner cavity of the second fixed cylinder (9) is fixed with multiple sets of unequally spaced third partition plates (14). The third partition plates (14) are fixed on the outside of the air outlet pipe (7). The inner wall of the second fixed cylinder (9) is fixed with multiple sets of elastic pieces (15). The elastic pieces (15) are movably sleeved on the outside of the air outlet pipe (7). The air outlet pipe (7) is provided with multiple sets of third through holes (16) at one end of the inner cavity of the second fixed cylinder (9). The third through holes (16) are located on both sides of the third partition plates (14).

5. The engine power pack muffler according to claim 1, characterized in that: The first fixed cylinder (17) includes a cylinder body (18) and a lid (19). A connecting flange (20) is provided at one end of the cylinder body (18), and the lid (19) and the connecting flange (20) are locked together by bolts and nuts.

6. The engine power pack muffler according to claim 5, characterized in that: A ring (21) is fixed on one side of the lid (19), and the ring (21) is embedded in the cavity (10) inside the cylinder (18).

7. The engine power pack muffler according to claim 1, characterized in that: The sound-absorbing filler (11) includes glass wool, rock wool and metal wire mesh, which are laid alternately.

8. An engine power pack muffler according to claim 4, characterized in that: The distance between each set of elastic plates (15) and the adjacent third partition plate (14) is different.

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