Multi-cavity composite noise reduction pipeline

Abstract

The present invention discloses a multi-chamber composite noise reduction pipeline, which, with the direction of airflow as the downstream direction, comprises a main pipeline, which is connected to a left flat box and a right flat box on the left and right sides, respectively, and the left and right flat boxes are both at the same height as the main pipeline; an intake hose is connected to the upstream end of the main pipeline, and a bellows is connected to the downstream end of the main pipeline; the bellows is used to connect to the engine supercharger, and the intake hose is used to connect to the outlet of the air filter; the left flat box is connected to the left with a left cavity cover, and the right flat box is connected to the right with a right cavity cover; the left cavity cover is a groove opening to the right and communicates with the left flat box, and the right cavity cover is a groove opening to the left and communicates with the right flat box; the main pipeline, the left cavity cover and the left flat box enclose a left muffler chamber, and the main pipeline, the right cavity cover and the right flat box enclose a right muffler chamber. The present invention can adapt to engine compartments with limited height, has an installation error-proofing function and a good noise reduction effect, and can specifically eliminate noise of specific frequencies through detailed structural limitations.

Description

Technical Field

[0001] The present invention relates to a noise reduction pipeline on the clean side of an engine air intake system, in particular to a noise reduction pipeline arranged between an air filter outlet and an engine supercharger. Background Art

[0002] The noise reduction tube involved in the present invention is used on the clean pipe at the rear end of the air filter and is equipped with PHEV models. During the early development of the engine intake system, a certain car manufacturer (motor vehicle manufacturer) encountered a prominent noise problem at a frequency of 60 Hz. It was necessary to design a resonant cavity on the clean side pipe to eliminate the noise radiated from the pipe mouth to meet the NVH requirements.

[0003] A traditional engine intake system consists of a dirty-side pipe that communicates with ambient air. The downstream end of the dirty-side pipe, with the air flow direction as the downstream direction, is connected to the air filter. The downstream end (the air outlet) of the air filter is connected to the clean-side pipe, which is then connected to the engine. To reduce noise, a quarter-wavelength tube can be installed in the dirty-side pipe, and a Helmholtz resonator can be installed in the clean-side pipe.

[0004] For some models, due to the limited space in the engine compartment, the height of the cavity is restricted, and it is impossible to make a resonant cavity higher than the main pipeline. Summary of the Invention

[0005] The object of the present invention is to provide a multi-cavity composite noise reduction pipeline used as a clean side pipeline, which can adapt to an engine compartment with limited height and has an installation error-proofing function and a good noise reduction effect.

[0006] To achieve the above-mentioned object, the present invention provides a multi-cavity composite noise reduction pipeline, which, with the direction of airflow as the downstream direction, includes a main pipeline, which is connected to a left flat box and a right flat box on the left and right sides, respectively, and the left flat box and the right flat box are both at the same height as the main pipeline; the upstream end of the main pipeline is connected to an intake hose, and the downstream end of the main pipeline is connected to a bellows; the bellows is used to connect to the engine supercharger, and the intake hose is used to connect to the outlet of the air filter; the left flat box is connected to the left with a left cavity cover, and the right flat box is connected to the right with a right cavity cover;

[0007] The left cavity cover is a groove opening to the right and communicates with the left flat box, and the right cavity cover is a groove opening to the left and communicates with the right flat box; the main line, the left cavity cover and the left flat box form a left silencer cavity, and the main line, the right cavity cover and the right flat box form a right silencer cavity.

[0008] The volume of the right silencer chamber is 0.9 liters. An inner tube is provided at the junction of the right chamber cover and the right flat box. The inner tube extends in the upstream and downstream directions as a whole. The inner diameter of the inner tube is 2 cm and its axial length is 24.8 cm. The downstream end of the inner tube is connected to the main line, and the upstream end of the inner tube is connected to the right silencer chamber. The right chamber cover and the inner tube are used to reduce noise at a frequency of 60 Hz.

[0009] A partition is provided in the middle of the left silencer cavity, which divides the left silencer cavity into a small noise reduction cavity and a large noise reduction cavity;

[0010] The volume of the small noise reduction chamber is 0.23 liters; on the vertical section along the upstream and downstream directions, the area of ​​the small noise reduction chamber is 10.81 square centimeters; the small noise reduction chamber is used to reduce noise at a frequency of 800 Hz;

[0011] The volume of the large noise reduction chamber is 0.4 liters; on the vertical section along the upstream and downstream directions, the area of ​​the large noise reduction chamber is 10.81 square centimeters; a noise reduction pipe is provided in the large noise reduction chamber, the noise reduction pipe is arranged horizontally and its axial direction is perpendicular to the upstream and downstream directions, the inner diameter of the noise reduction pipe is 2 cm and its length is 1.68 cm; one end of the noise reduction pipe is facing the left chamber cover; the large noise reduction chamber and the noise reduction pipe are used to reduce noise with a frequency of 300HZ.

[0012] The inner tube has a bent portion.

[0013] The overall structure formed by the left flat box and the right flat box of the main pipeline 1 is in the shape of a rectangular parallelepiped. The lower surface of the overall structure is provided with mounting platforms near the four corners, and the mounting platforms are connected downwardly to shock-absorbing pads.

[0014] The present invention has the following advantages:

[0015] The present invention achieves flexible connection with upstream and downstream structures through a bellows and intake hose, providing a preventative installation feature and eliminating the need for strict alignment with upstream and downstream structures. The flat box design creates a sound-absorbing cavity while accommodating engine compartment space limitations, enabling installation in engine compartments of a wider range of vehicle models.

[0016] The present invention can significantly eliminate noise at 300HZ and 800HZ frequencies in a targeted manner through related structures such as a small noise reduction cavity and a large noise reduction cavity.

[0017] The present invention, through the specific configuration of the right muffler chamber, can effectively and significantly eliminate 60Hz frequency noise. The inner tube has a bend, which shortens the inner tube in the upstream and downstream directions while maintaining its overall length. This reduces the upstream and downstream lengths of the main pipe, left chamber cover, and right chamber cover. This makes it easier to arrange the main pipe in the limited engine compartment space, adapting to the installation space of more vehicle models.

[0018] During installation, the main pipeline is assembled with the engine through the mounting platform, shock-absorbing pads and external ball studs to reduce vibration during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional decomposition structure of the present invention;

[0020] Figure 2 is a top view of the present invention;

[0021] Figure 3 It is a top view of the present invention. DETAILED DESCRIPTION

[0022] like Figures 1 to 3 As shown, the present invention provides a multi-cavity composite noise reduction pipeline, which, with the direction of airflow as the downstream direction, includes a main pipeline 1, which is connected to a left flat box 13 and a right flat box 14 on the left and right sides, respectively. The left flat box 13 and the right flat box 14 are both at the same height as the main pipeline 1 (the left flat box 13, the right flat box 14 and the main pipeline 1 can be manufactured separately and then connected, or can be integrally cast). The upstream end of the main pipeline 1 is connected to an intake hose 2, and the downstream end of the main pipeline 1 is connected to a bellows 3; the bellows 3 is used to connect to the engine supercharger, and the intake hose 2 is used to connect to the outlet of the air filter.

[0023] The left flat box 13 is connected to the left cavity cover 4, and the right flat box is connected to the right cavity cover 5;

[0024] The left cavity cover 4 is a groove opening to the right and communicates with the left flat box 13, and the right cavity cover 5 is a groove opening to the left and communicates with the right flat box 14;

[0025] The main line 1, the left chamber cover 4 and the left flat box 13 form the left muffler chamber, and the main line 1, the right chamber cover 5 and the right flat box 14 form the right muffler chamber 15.

[0026] The present invention achieves flexible connection with upstream and downstream structures through the bellows 3 and intake hose 2, providing a preventative installation feature and eliminating the need for strict alignment with upstream and downstream structures. The flat box design not only creates a sound-absorbing cavity but also adapts to the limited height of the engine compartment, making it suitable for installation in the engine compartments of a wider range of vehicle models.

[0027] A partition 6 is provided in the middle of the left muffler chamber. The partition 6 extends left and right in a direction perpendicular to the upstream and downstream directions. The right end of the partition 6 is connected to the main pipe 1, and the left end of the partition 6 is connected to the left chamber cover 4. The partition 6 divides the left muffler chamber into a small noise reduction chamber 7 and a large noise reduction chamber 8.

[0028] The volume of the small noise reduction chamber 7 is 0.23 liters; in the vertical section along the upstream and downstream directions, the area of ​​the small noise reduction chamber 7 is 10.81 square centimeters; the small noise reduction chamber 7 is used to reduce the noise of the 800 Hz frequency;

[0029] The volume of the large noise reduction chamber 8 is 0.4 liters; on the vertical section along the upstream and downstream directions, the area of ​​the large noise reduction chamber 8 is 10.81 square centimeters; a noise reduction tube is provided in the large noise reduction chamber 8, the noise reduction tube is horizontally arranged and its axial direction is perpendicular to the upstream and downstream directions, the inner diameter of the noise reduction tube is 2 cm and its length is 1.68 cm; one end of the noise reduction tube is facing the left chamber cover 4; the large noise reduction chamber 8 and the noise reduction tube are used to reduce noise with a frequency of 300HZ; the noise reduction tube is blocked by the left flat box 13 in the figure and is not shown.

[0030] The present invention can significantly and specifically eliminate noises of 300 Hz and 800 Hz frequencies through related structures such as the small noise reduction chamber 7 and the large noise reduction chamber 8.

[0031] The volume of the right silencer chamber 15 is 0.9 liters. An inner tube 9 is provided at the junction of the right chamber cover 5 and the right flat box 14. The inner tube 9 extends as a whole in the upstream and downstream directions. The inner diameter of the inner tube 9 is 2 cm and its axial length is 24.8 cm. The downstream end of the inner tube 9 is connected to the main line, and the upstream end of the inner tube 9 is connected to the right silencer chamber 15. The right chamber cover 5 and the inner tube 9 (as well as the right silencer chamber 15) are used to reduce noise with a frequency of 60 Hz.

[0032] The inner tube 9 is preferably connected to the main line 1 by plugging, and the right chamber cover 5 is preferably connected to a positioning support plate 12 for positioning the inner tube 9 (to prevent it from dangling during operation). The inner tube 9 has a bend, which can shorten its length in the upstream and downstream directions while maintaining its overall length. This reduces the length of the main line 1, the left chamber cover 4, and the right chamber cover 5 in this direction, making it easier to install the main line 1 in the limited space of the engine compartment and adapting it to the installation space of more vehicle models.

[0033] The overall structure formed by the main line 1, the left flat box 13 and the right flat box 14 is in the shape of a cuboid. Mounting platforms 10 are provided on the lower surface of the overall structure near the four corners. Shock-absorbing pads 11 are connected downwardly to the mounting platforms 10.

[0034] During installation, the present invention is assembled with the engine through the mounting platform 10, the shock-absorbing pad 11 and the external ball stud, thereby reducing vibration during operation.

[0035] In the present invention, the left cavity cover 4, the right cavity cover 5, the left flat box 13, the right flat box 14, the main line 1 and the inner insert 9 are all made of plastic material, and the material is PP-GF30; the shock-absorbing pad 11 is made of rubber, preferably EPDM rubber.

[0036] The present invention is installed in the engine compartment of a motor vehicle. During installation, since the air intake hose 2 and the bellows 3 both have good deformation and stretching properties, they can provide a positioning error prevention function within the limited installation space of the motor vehicle, and can achieve good docking without strict alignment of the upstream and downstream connection structures.

[0037] During operation, air flows through the air filter before entering the main line 1, with some gas entering the inner tube 9. The left and right muffler chambers 15 and other muffler structures significantly reduce noise. Specifically, specialized muffler structures are designed to eliminate prominent noise frequencies found in vehicle manufacturers, enhancing the noise reduction effect.

[0038] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A multi-cavity composite noise reduction pipeline, with the direction of airflow as the downstream direction, including a main pipeline, characterized by: The main pipeline is connected to the left and right flat boxes on the left and right sides respectively, and the left and right flat boxes are both at the same height as the main pipeline; the upstream end of the main pipeline is connected to the intake hose, and the downstream end of the main pipeline is connected to the bellows; the bellows is used to connect to the engine supercharger, and the intake hose is used to connect to the outlet of the air filter; the left flat box is connected to the left with the left cavity cover, and the right flat box is connected to the right with the right cavity cover; The left cavity cover is in the form of a groove opening to the right and communicates with the left flat box, and the right cavity cover is in the form of a groove opening to the left and communicates with the right flat box; the main pipe, the left cavity cover and the left flat box form a left muffler cavity, and the main pipe, the right cavity cover and the right flat box form a right muffler cavity; An inner insert is provided at the junction of the right cavity cover and the right flat box. The inner insert extends in the upstream and downstream directions as a whole and has a bent portion to enable the main pipe to adapt to the limited space of the engine compartment. The volume of the right silencer chamber is 0.9 liters. The downstream end of the inner tube is plugged into the main pipeline, and the upstream end of the inner tube is connected to the right silencer chamber. A partition is provided in the middle of the left silencer chamber, which divides the left silencer chamber into a small noise reduction chamber and a large noise reduction chamber. The volume of the small noise reduction chamber is 0.23 liters; the volume of the large noise reduction chamber is 0.4 liters. A noise reduction pipe is arranged in the large noise reduction cavity, and one end of the noise reduction pipe is directly facing the left cavity cover.

2. The multi-cavity composite noise reduction pipeline according to claim 1, characterized in that: The inner diameter of the inner cannula is 2 cm and its axial length is 24.8 cm; the right chamber cover and the inner cannula are used to reduce noise at a frequency of 60 Hz.

3. The multi-cavity composite noise reduction pipeline according to claim 2 is characterized in that: On the vertical section along the upstream and downstream directions, the area of ​​the small noise reduction cavity is 10.81 square centimeters; the small noise reduction cavity is used to reduce the noise of the 800HZ frequency; On the vertical section along the upstream and downstream directions, the area of ​​the large noise reduction cavity is 10.81 square centimeters; the noise reduction pipe is arranged horizontally and its axial direction is perpendicular to the upstream and downstream directions. The inner diameter of the noise reduction pipe is 2 centimeters and its length is 1.68 centimeters; the large noise reduction cavity and the noise reduction pipe are used to reduce noise with a frequency of 300HZ.

4. The multi-cavity composite noise reduction pipeline according to any one of claims 1 to 3, characterized in that: The overall structure formed by the main pipeline, the left flat box and the right flat box is in the shape of a rectangular parallelepiped. Mounting platforms are respectively provided on the lower surface of the overall structure near the four corners, and the mounting platforms are connected downwardly with shock-absorbing pads.

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