A low noise air cleaner for an engine intake system

Abstract

This utility model discloses a low-noise air filter for an engine intake system, including a housing and a filter assembly located inside the housing. The top of the housing is provided with a vent pipe communicating with the outside. The filter assembly contains a cylindrical tube communicating with the vent pipe. Multiple noise-reducing components are arranged inside the cylindrical tube. The noise-reducing components include a first noise-reducing plate and a second noise-reducing plate. Several rings of ventilation and noise-reducing holes are opened on both the first and second noise-reducing plates. Elastic noise-reducing tubes are arranged at intervals within the rings of ventilation and noise-reducing holes. When air flows through the first and second noise-reducing plates, the airflow enters the elastic noise-reducing tubes through the ventilation and noise-reducing holes. The airflow path inside the tube changes due to the slight deformation of the elastic noise-reducing tube, causing the sound waves to bounce multiple times inside the tube and gradually dissipate. The relative rotation of the first and second noise-reducing plates further disturbs the airflow and enhances the effect of sound wave intersection and mutual cancellation.

Description

Technical Field

[0001] This utility model belongs to the technical field of engine air filters, specifically a low-noise air filter for engine intake systems. Background Technology

[0002] The engine air filter is an important component in the car engine's intake system. It is mainly used to filter the air entering the engine to ensure air cleanliness. Under normal circumstances, the car air filter may generate some noise due to airflow. When the engine is running, air enters the intake system through the filter, and the airflow inside the filter will produce a certain amount of airflow noise, which will reduce the user's driving experience.

[0003] Existing air filters, such as the "An Air Filter for Sterilization and Noise Reduction in Automobiles" disclosed in patent document "CN203447947U", use a tubular support frame with an inner layer of yarn, an activated carbon powder layer in the middle, and an outer layer of cotton thread to form a tubular surface formed by winding the activated carbon powder layer on the tubular support frame to absorb noise. However, the effect of using cotton thread to absorb noise is limited and cannot effectively reduce the noise level.

[0004] Therefore, this utility model discloses a novel low-noise air filter for engine intake systems. Utility Model Content

[0005] The purpose of this invention is to provide a low-noise air filter for engine intake systems to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A low-noise air filter for an engine intake system includes a housing and a filter assembly located within the housing. The top of the housing is provided with a vent pipe communicating with the outside. The filter assembly contains a cylindrical tube communicating with the vent pipe. Multiple noise-reducing components are disposed within the cylindrical tube. Each noise-reducing component includes a first noise-reducing plate and a second noise-reducing plate. Both the first and second noise-reducing plates have several rings of ventilation and noise-reducing holes located between them. Elastic noise-reducing tubes are spaced apart within the rings of ventilation and noise-reducing holes.

[0008] A further technical solution includes an upper circular plate and a lower circular plate spaced apart. A cylindrical tube is connected to the upper circular plate. The upper circular plate has a vent hole through which a vent pipe passes. A stabilizing net is provided between the upper and lower circular plates. A filter element one is provided inside the stabilizing net. The filter element one is laterally folded. The cylindrical tube is located inside the filter element one. A filter element two is provided outside the stabilizing net. The filter element two is longitudinally folded. The two ends of the stabilizing net, filter element one, and filter element two are fixedly connected to the upper and lower circular plates, respectively.

[0009] In a further technical solution, the inner wall of the cylindrical tube is symmetrically provided with multiple stabilizing grooves, and the outer sides of the first and second sound-absorbing plates are fixedly installed with limiting blocks that cooperate with the stabilizing grooves.

[0010] In a further technical solution, the bottom of the upper circular plate is provided with a plurality of support rods, which are arranged in a circular array and distributed between the filter element and the cylindrical tube, and the outer walls of the plurality of support rods abut against the filter element.

[0011] In a further technical solution, the bottom of the lower circular plate is provided with a bottom groove, and a buffer spring is fixedly connected in the bottom groove. The other end of the buffer spring abuts against the inner wall of the outer shell.

[0012] In a further technical solution, sound-absorbing sponges are fixedly installed between the inner wall of the outer shell and the buffer spring.

[0013] In a further technical solution, the vent pipe extends below the vent hole, the inner wall of the vent hole is provided with an annular groove, a sealing ring is provided on the annular groove, and the inner side of the sealing ring abuts against the outer wall of the vent pipe.

[0014] In a further technical solution, the bottom of the outer shell is provided with an upwardly extending annular protrusion, and the center of the bottom groove is provided with a buffer post into which the annular protrusion is inserted, and the outer wall of the buffer post contacts the inner wall of the annular protrusion.

[0015] The beneficial effects of this utility model are:

[0016] In this invention, air enters through the vent pipe at the top of the outer shell, connects with the cylindrical tube, and flows through the silencing assembly. The silencing assembly consists of a first silencing plate and a second silencing plate, each with five rings of venting and silencing holes. An elastic silencing tube connects the second and fourth rings of venting and silencing holes. When air flows through the first and second silencing plates, the airflow enters the elastic silencing tube through the venting and silencing holes. The airflow path inside the tube changes due to the slight deformation of the elastic silencing tube, causing sound waves to bounce multiple times within the tube and gradually dissipate. The relative rotation of the first and second silencing plates further disrupts the airflow, enhancing the cross-linking and mutual impact of sound waves. The sound-absorbing material, combined with the layout of the ventilation and sound-absorbing holes, ensures smooth airflow while effectively absorbing noise. The three spaced-apart sound-absorbing components dynamically adjust the airflow path and sound wave propagation to achieve efficient noise reduction and improve the noise reduction performance of the engine intake system. The sound-absorbing components change the airflow path through the dynamic rotation of the first and second sound-absorbing plates and the deformation of the elastic sound-absorbing tube, causing the sound waves to bounce and dissipate inside the tube. The sound waves also cancel each other out through interlacing, resulting in a noise reduction effect superior to traditional cotton thread adsorption. The combination of ventilation and sound-absorbing holes and sound-absorbing materials ensures smooth airflow while effectively reducing noise levels.

[0017] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0018] Figure 1 The overall structure of this utility model Figure 1 .

[0019] Figure 2 The overall structure of this utility model Figure 1 .

[0020] Figure 3 Top view of this utility model.

[0021] Figure 4 : Cross-sectional view of this utility model.

[0022] Figure 5 : Structural diagram of the cylindrical tube and noise reduction component of this utility model.

[0023] Figure 6 Top view of the cylindrical tube and silencing component of this utility model.

[0024] Figure 7 : Front view of the cylindrical tube and the sound-absorbing component of this utility model.

[0025] Figure 8 Cross-sectional view of the cylindrical tube and silencing component of this utility model.

[0026] Figure 9 : Exploded view of this utility model.

[0027] Reference numerals: 1. Outer shell; 2. Vent pipe; 3. Cylindrical tube; 4. Silencing assembly; 41. First silencing plate; 42. Second silencing plate; 5. Vent and silencing hole; 6. Elastic silencing pipe; 7. Upper circular plate; 8. Lower circular plate; 9. Vent hole; 10. Stabilizing net; 11. Filter element one; 12. Filter element two; 13. Stabilizing groove; 14. Limiting block; 15. Support rod; 16. Bottom groove; 17. Buffer spring; 18. Sealing ring; 19. Annular protrusion; 20. Buffer column Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0029] Please refer to Figure 1-9 ;

[0030] This embodiment discloses a low-noise air filter for an engine intake system, including a housing 1 and a filter assembly located inside the housing 1. The top of the housing 1 is provided with a vent pipe 2 communicating with the outside. The filter assembly is provided with a cylindrical cylinder 3, which is connected to the vent pipe 2. Multiple noise-reducing components 4 are provided inside the cylindrical cylinder 3. In this embodiment, there are three noise-reducing components 4, which are arranged at intervals inside the cylindrical cylinder 3. Specifically, the noise-reducing components 4 include a first noise-reducing plate 41 and a second noise-reducing plate 42. Several rings of ventilation and noise-reducing holes 5 are opened on the first noise-reducing plate 41 and the second noise-reducing plate 42, which are located between the first noise-reducing plate 41 and the second noise-reducing plate 42. Elastic noise-reducing tubes 6 are arranged at intervals in the rings of ventilation and noise-reducing holes 5. In this embodiment, there are 5 rings of ventilation and noise-reducing holes 5, and the elastic noise-reducing tubes 6 are arranged in the second and fourth rings from the inside to the outside.

[0031] Specifically, when air enters from the top vent pipe 2 of the outer casing 1, it flows through the cylindrical tube 3 and then through the silencing assembly 4. The silencing assembly 4 consists of a first silencing plate 41 and a second silencing plate 42, both of which have five rings of venting and silencing holes 5. An elastic silencing tube 6 connects the second and fourth rings of venting and silencing holes 5. When air flows through the first silencing plate 41 and the second silencing plate 42, the airflow enters the elastic silencing tube 6 through the venting and silencing holes 5. The airflow path inside the tube changes due to the slight deformation of the elastic silencing tube 6, causing the sound waves to bounce multiple times inside the tube and gradually dissipate. The relative rotation of the first silencing plate 41 and the second silencing plate 42 further disturbs the airflow and enhances the sound. The sound-absorbing material, combined with the layout of the ventilation and silencing holes 5, ensures smooth airflow while effectively absorbing noise. The three spaced-apart silencing components 4 dynamically adjust the airflow path and sound wave propagation to achieve efficient noise reduction and improve the noise reduction performance of the engine intake system. The silencing components 4 change the airflow path through the dynamic rotation of the first silencing plate 41 and the second silencing plate 42 and the deformation of the elastic silencing tube 6, causing the sound waves to bounce and dissipate inside the tube. The sound waves also cancel each other out through interlacing, resulting in a noise reduction effect superior to the traditional cotton thread adsorption method. The combination of the ventilation and silencing holes 5 and the sound-absorbing material ensures smooth airflow while effectively reducing the noise level.

[0032] Furthermore, the filter assembly includes an upper circular plate 7 and a lower circular plate 8 spaced apart. A cylindrical tube 3 is connected to the upper circular plate 7. The upper circular plate 7 has a vent hole 9 through which the vent pipe 2 passes. A stabilizing net 10 is provided between the upper circular plate 7 and the lower circular plate 8. A filter element 11 is provided inside the stabilizing net 10. The filter element 11 is folded laterally. The cylindrical tube 3 is located inside the filter element 11. A filter element 2 12 is provided outside the stabilizing net 10. The filter element 2 12 is folded longitudinally. The two ends of the stabilizing net 10, the filter element 11, and the filter element 2 12 are fixedly connected to the upper circular plate 7 and the lower circular plate 8, respectively. During operation, air enters the filter assembly through the vent pipe 2, first passing through the cylindrical tube 3, and after being silenced, it passes through filter element 11, which intercepts most particulate impurities. Subsequently, the air passes through the stabilizing net 10 to reach filter element 2 12 for secondary filtration, further removing residual impurities. Finally, clean air is delivered to the engine, ensuring efficient and clean combustion. The filter assembly removes dust and particulate matter from the air, preventing impurities from entering the combustion chamber, protecting internal engine parts from wear and carbon buildup, promoting complete fuel combustion, and improving work efficiency. This embodiment balances noise reduction and filtration performance, extending engine lifespan. Filter element 11 and filter element 2 12 are preferably made of high-performance synthetic fiber materials, such as polyester, polypropylene, or glass fiber, and are made into nonwoven fabrics through wet or melt-blown processes. They have the characteristics of uniform fiber, high porosity, excellent mechanical strength, and resistance to damp heat and corrosion, making them suitable for the harsh environment of the engine compartment. The surfaces of filter element 11 and filter element 2 are coated with a hydrophobic treatment agent, such as polytetrafluoroethylene dispersion or acrylic resin, which can effectively repel moisture and oil mist, prevent the filter paper from being clogged by moisture or oil, and maintain long-term stable filtration performance.

[0033] Furthermore, the inner wall of the cylindrical tube 3 is symmetrically provided with multiple stabilizing grooves 13. Limiting blocks 14, which cooperate with the stabilizing grooves 13, are fixedly installed on the outer sides of both the first and second sound-absorbing plates 41 and 42. Specifically, the limiting blocks 14 on the first and second sound-absorbing plates 41 and 42 cooperate to achieve dynamic rotation of the two plates, enhancing the airflow path adjustment capability and effectively reducing noise. The ventilation and sound-absorbing holes 5 are combined with the elastic sound-absorbing pipe 6, causing sound waves to bounce multiple times within the pipe and cancel each other out, significantly superior to traditional fixed noise reduction structures. The sound-absorbing material and modular design ensure smooth airflow while efficiently absorbing noise, adapting to various intake system requirements. Compared to traditional technologies, this device has better noise reduction effects, is easy to install and maintain, and is suitable for automotive and industrial applications.

[0034] In this embodiment, the bottom of the upper circular plate 7 is provided with a plurality of support rods 15. The plurality of support rods 15 are arranged in a circular array and distributed between the filter element 11 and the cylindrical tube 3. The outer walls of the plurality of support rods 15 are all in contact with the filter element 11. The other side of the filter element 11 is physically limited by the support rods 15 to enhance the structural stability of the filter element 11 and prevent it from shifting under the impact of high-speed airflow. At the same time, the circular array layout of the support rods 15 can achieve uniform force distribution and ensure the stability of the overall structure of the filter assembly.

[0035] In this embodiment, a bottom groove 16 is provided at the bottom of the lower circular plate 8. A buffer spring 17 is fixedly connected in the bottom groove 16. The other end of the buffer spring 17 abuts against the inner wall of the outer shell 1. The buffer spring 17 can continuously apply an upward supporting force to the filter assembly through the pressure generated by the elastic deformation. When the filter is subjected to external vibration and impact, the buffer spring 17 can effectively buffer the impact energy and maintain the continuous support for the filter assembly, ensuring that the communication between the filter assembly and the vent pipe 2 is not affected.

[0036] In this embodiment, sound-absorbing sponges are fixedly installed between the inner wall of the outer shell 1 and the buffer spring 17 to further improve the noise reduction performance.

[0037] In this embodiment, the vent pipe 2 extends below the vent hole 9. The inner wall of the vent hole 9 is provided with an annular groove, and a sealing ring 18 is provided on the annular groove. The inner side of the sealing ring 18 abuts against the outer wall of the vent pipe 2. By setting the sealing ring 18, the connection between the vent pipe 2 and the upper circular plate 7 can be effectively sealed, preventing air from leaking directly from the gap between the vent pipe 2 and the vent hole 9 when entering the filter assembly. This ensures that all air is filtered by the filter assembly before entering the engine, thus ensuring the filtration effect of the air filter.

[0038] A further technical solution is provided with an upwardly extending annular protrusion 19 at the bottom of the outer casing 1, and a buffer post 20 inserted into the annular protrusion 19 at the center of the bottom groove 16. The outer wall of the buffer post 20 contacts the inner wall of the annular protrusion 19. When subjected to external force and vibration, it can limit the relative displacement between the filter assembly and the outer casing 1, prevent the filter assembly from shifting or shaking, and thus ensure the stability of the filter assembly in use.

[0039] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0040] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A low-noise air filter for an engine intake system, characterized in that, The device includes an outer shell (1) and a filter assembly located inside the outer shell (1). The top of the outer shell (1) is provided with a vent pipe (2) that communicates with the outside. The filter assembly is provided with a cylindrical tube (3) that communicates with the vent pipe (2). The cylindrical tube (3) is provided with multiple silencing components (4). The silencing components (4) include a first silencing plate (41) and a second silencing plate (42). Both the first silencing plate (41) and the second silencing plate (42) are provided with several rings of ventilation and silencing holes (5) located between the first silencing plate (41) and the second silencing plate (42). Elastic silencing tubes (6) are provided at intervals within the several rings of ventilation and silencing holes (5).

2. A low-noise air filter for an engine intake system according to claim 1, characterized in that, The filter assembly includes an upper circular plate (7) and a lower circular plate (8) spaced apart. The cylindrical tube (3) is connected to the upper circular plate (7). The upper circular plate (7) has a vent hole (9) through which the vent pipe (2) passes. A stabilizing net (10) is provided between the upper circular plate (7) and the lower circular plate (8). A filter element (11) is provided inside the stabilizing net (10). The filter element (11) is folded laterally. The cylindrical tube (3) is located inside the filter element (11). A filter element (12) is provided outside the stabilizing net (10). The filter element (12) is folded longitudinally. The two ends of the stabilizing net (10), filter element (11), and filter element (12) are fixedly connected to the upper circular plate (7) and the lower circular plate (8), respectively.

3. A low-noise air filter for an engine intake system according to claim 1, characterized in that, The inner wall of the cylindrical tube (3) is symmetrically provided with multiple stabilizing grooves (13), and the outer sides of the first silencing plate (41) and the second silencing plate (42) are fixedly installed with limiting blocks (14) that cooperate with the stabilizing grooves (13).

4. A low-noise air filter for an engine intake system according to claim 2, characterized in that, The bottom of the upper circular plate (7) is provided with several support rods (15). The several support rods (15) are arranged in a circular array and distributed between the filter element (11) and the cylindrical tube (3). The outer walls of the several support rods (15) are all in contact with the filter element (11).

5. A low-noise air filter for an engine intake system according to claim 2, characterized in that, The bottom of the lower circular plate (8) is provided with a bottom groove (16), and a buffer spring (17) is fixedly connected in the bottom groove (16). The other end of the buffer spring (17) abuts against the inner wall of the outer shell (1).

6. A low-noise air filter for an engine intake system according to claim 5, characterized in that, Sound-absorbing sponges are fixedly installed between the inner wall of the outer shell (1) and the buffer spring (17).

7. A low-noise air filter for an engine intake system according to claim 2, characterized in that, The vent pipe (2) extends below the vent hole (9). The inner wall of the vent hole (9) is provided with an annular groove, and a sealing ring (18) is provided on the annular groove. The inner side of the sealing ring (18) abuts against the outer wall of the vent pipe (2).

8. A low-noise air filter for an engine intake system according to claim 5, characterized in that, The bottom of the outer shell (1) is provided with an upwardly extending annular protrusion (19), and the center of the bottom groove (16) is provided with a buffer post (20) into which the annular protrusion (19) is inserted. The outer wall of the buffer post (20) is in contact with the inner wall of the annular protrusion (19).

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