Broadband noise reduction ventilation type superstructure and automobile ventilation frame

Abstract

The invention belongs to the technical field of automobile parts, and discloses a broadband noise reduction ventilation type superstructure and an automobile ventilation frame. The broadband noise reduction ventilation type superstructure comprises a superstructure body, a plurality of ventilation channels are formed in the superstructure body, a plurality of sound absorption unit cavities are formed in the inner side wall of each ventilation channel, and the sound absorption unit cavities are distributed in the circumferential direction of the ventilation channels at intervals and form sound absorption cavity sets. The multiple sound absorption cavity sets are distributed at intervals in the axial direction of the ventilation channel and form a multi-layer sound absorption structure, and the size parameters and the mutual intervals of the sound absorption unit cavities are designed according to the noise frequency band needing to be reduced. Noise of a specific frequency band is attenuated more effectively, noise energy of motor howling outside an automobile is effectively absorbed and reflected when passing through the automobile ventilation frame adopting the broadband noise reduction ventilation type superstructure, so that the noise entering the automobile is obviously reduced, the ventilation capacity of an original automobile ventilation frame is not obviously changed, and the noise reduction effect is good. And the normal use requirement of the vehicle is completely met.

Description

Technical Field

[0001] This invention relates to the field of automotive parts technology, and in particular to a broadband noise reduction and ventilation superstructure and automotive ventilation frame. Background Technology

[0002] The ventilation frame is a crucial component in automobiles used to maintain air pressure balance and regulate airflow direction within the cabin. It is typically installed on the inner sheet metal of the left and right sides of the trunk, one on each side. Its working principle involves a mechanical structure where, when the vehicle's external air circulation is activated, the pressure difference between the inside and outside of the cabin causes the ventilators to open, thus allowing air circulation and maintaining stable cabin pressure. However, in existing technology, when the ventilator blades are open, the motor noise from outside the vehicle is directly transmitted into the cabin through the ventilation frame, negatively impacting the passenger experience.

[0003] Patent CN120963308A discloses a vehicle body acoustic superstructure noise reduction ventilation frame that can specifically reduce motor whine noise; however, this solution can usually only optimize the frequency band dominated by a certain center frequency in motor whine (such as the 4000Hz-4500Hz band), resulting in a narrow noise reduction bandwidth. In reality, motor whine is a broadband noise containing multiple harmonic components, and existing structures are unable to achieve comprehensive and efficient attenuation of the entire whine frequency band, leaving considerable room for improvement in noise reduction performance. Summary of the Invention

[0004] To address the aforementioned problems, the present invention aims to provide a wideband noise-reducing ventilation superstructure and automotive ventilation frame, which improves upon the existing technology's narrow noise reduction bandwidth for motor whine noise and its inability to effectively cope with the wideband composite noise of motors, thereby significantly improving noise reduction performance while ensuring airflow.

[0005] To achieve this objective, the present invention employs the following technical solution: A broadband noise reduction and ventilation superstructure includes a superstructure body with several ventilation channels. Each ventilation channel has several sound-absorbing unit cavities on its inner wall. The multiple sound-absorbing unit cavities are distributed circumferentially along the ventilation channels to form sound-absorbing cavity groups, and the multiple sound-absorbing cavity groups are distributed axially along the ventilation channels to form a multi-layer sound-absorbing structure. The size parameters and spacing of each sound-absorbing unit cavity are designed according to the noise frequency band to be reduced.

[0006] As an alternative, the cross-section of the sound-absorbing unit cavity can be rectangular, cylindrical, or triangular.

[0007] As an alternative, the sound-absorbing unit cavity is a rectangular cavity with a length of 11mm to 14mm, a width of 7mm, and a depth of 3mm.

[0008] As an alternative, the length of the sound-absorbing unit cavities in the same sound-absorbing cavity group is arranged along the axial direction of the air-permeable channel or perpendicular to the axial direction of the air-permeable channel.

[0009] As an alternative, the length directions of multiple sound-absorbing unit cavities in the same multi-layer sound-absorbing structure are the same.

[0010] As an alternative, the length direction of the sound-absorbing unit cavity of at least one of the multiple air-permeable channels is different from the length direction of the sound-absorbing unit cavities of the other air-permeable channels.

[0011] As an alternative, the superstructure body is integrally molded from metal or lightweight composite materials.

[0012] On the other hand, the present invention adopts the following technical solution: A car ventilation frame includes a ventilation frame body, on which the aforementioned broadband noise reduction ventilation superstructure is installed. The ventilation frame body is provided with a plurality of ventilation openings, and the ventilation openings correspond one-to-one with and are connected to the ventilation channels of the broadband noise reduction ventilation superstructure.

[0013] As an alternative, the cross-sectional shape and size of the ventilation channel are consistent with the cross-sectional shape and size of the vent.

[0014] As an alternative, the ventilation frame body is provided with a snap-fit ​​seat, and the broadband noise-reducing ventilation superstructure is provided with a snap-fit ​​head that engages with the snap-fit ​​seat; or, the ventilation frame body and the broadband noise-reducing ventilation superstructure are respectively provided with corresponding screw holes, and the ventilation frame body and the broadband noise-reducing ventilation superstructure are fixedly connected by bolts.

[0015] The beneficial effects of this invention are: This wideband noise-reducing ventilation superstructure decomposes the noise reduction function for motor whistling into a multi-layer sound-absorbing structure. The layout and size parameters of each sound-absorbing unit cavity in each sound-absorbing cavity group in the multi-layer sound-absorbing structure are designed according to the noise frequency band. The structure of each sound-absorbing cavity group can be kept consistent to improve the noise reduction performance for specific narrow frequency noise, or it can be designed differently to achieve noise reduction performance for different frequency bands, thereby achieving more effective attenuation of noise in specific frequency bands.

[0016] When the vehicle's external air circulation is activated, the noise energy from the motor's roar outside the vehicle is effectively absorbed and reflected when passing through the car's ventilation frame, which uses this wideband noise reduction and ventilation superstructure. As a result, the noise entering the vehicle is significantly reduced, and the ventilation volume of the original car ventilation frame remains unchanged, fully meeting the normal operating needs of the vehicle. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a broadband noise-reducing ventilation superstructure provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the automotive ventilation frame provided in an embodiment of the present invention; Figure 3 This is a side view of the automotive ventilation frame provided in an embodiment of the present invention; Figure 4 This is a comparison chart of the sound insulation effects of the original car ventilation frame, the existing noise-reducing ventilation frame, and the super-structured car ventilation frame with broadband noise reduction ventilation.

[0018] In the attached image: 1. Superstructure main body; 11. Ventilation channel; 12. Sound-absorbing unit cavity; 13. Clip; 2. Ventilation frame body; 21. Buckle seat. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0020] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0021] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "on the upper side," and "over" the second feature include the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature include the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] like Figure 1As shown, the present invention provides a broadband noise reduction and ventilation type superstructure, including a superstructure body 1, a plurality of ventilation channels 11 are provided on the superstructure body 1, a plurality of sound-absorbing unit cavities 12 are provided on the inner sidewall of each ventilation channel 11, the plurality of sound-absorbing unit cavities 12 are distributed circumferentially along the ventilation channel 11 to form a sound-absorbing cavity group, and the plurality of sound-absorbing cavity groups are distributed axially along the ventilation channel 11 to form a multi-layer sound-absorbing structure, the size parameters and mutual spacing of each sound-absorbing unit cavity 12 are designed according to the noise frequency band to be reduced.

[0024] Therefore, the noise reduction function for motor whistling is decomposed into a multi-layer sound absorption structure. The layout and size parameters of each sound absorption unit cavity 12 in each sound absorption cavity group in the multi-layer sound absorption structure are designed according to the noise frequency band. The structure of each sound absorption cavity group can be kept consistent to improve the noise reduction performance for specific narrow frequency noise, or it can be designed differently to achieve noise reduction performance for different frequency bands, thereby more effectively attenuating noise in specific frequency bands.

[0025] Optionally, the cross-section of the sound-absorbing unit cavity 12 can be rectangular, cylindrical, triangular, etc., all of which can absorb and reflect noise.

[0026] In at least one embodiment, the sound-absorbing unit cavity 12 is designed as a rectangular cavity with a length of 11mm to 14mm, a width of 7mm, and a depth of 3mm.

[0027] Based on the spectral analysis of common vehicle noises, the main frequency range of motor whine was determined to be 4000Hz to 5000Hz. The sound-absorbing unit cavity 12 was designed as a rectangular cavity of the above dimensions, which can effectively attenuate noise in this frequency range.

[0028] Optionally, the length direction of the sound-absorbing unit cavities 12 in the same sound-absorbing cavity group is arranged along the axial direction of the air-permeable channel 11 or perpendicular to the axial direction of the air-permeable channel 11. The sound-absorbing cavity groups with different arrangement directions have different absorption and reflection effects on sound waves, thus being able to cope with noise of different frequencies.

[0029] Optionally, the sound-absorbing unit cavities 12 in the same multi-layer sound-absorbing structure have the same length direction. This arrangement can ensure sufficient noise reduction for specific frequency bands.

[0030] Optionally, the length direction of the sound-absorbing unit cavity 12 of at least one of the multiple ventilation channels 11 is different from the length direction of the sound-absorbing unit cavity 12 of the other ventilation channels 11. This arrangement provides more combination inspiration and more flexible layout.

[0031] Optionally, the superstructure body 1 is integrally formed from metal or lightweight composite materials.

[0032] Metal materials have higher strength and durability, making them suitable for harsh environments; lightweight composite materials have light weight and good mechanical properties, and can be carbon fiber composites, glass fiber reinforced plastics, polymer composites, etc.

[0033] Based on this, the present invention also provides an automotive ventilation frame, such as... Figure 2 and Figure 3 As shown, it includes a ventilation frame body 2, on which the aforementioned broadband noise reduction ventilation superstructure is installed. The ventilation frame body 2 is provided with a number of ventilation openings, which correspond one-to-one with and are connected to the ventilation channels 11 of the broadband noise reduction ventilation superstructure.

[0034] The ventilation frame body 2 is the rear fender air vent equipped by the vehicle itself. Its structure and working principle are consistent with the existing technology. Specifically, it is located on the inner sheet metal of the left and right sides of the trunk, one on each side. When the vehicle is in external circulation mode, the fan blades on the ventilation frame body 2 are opened by relying on the pressure difference between the inside and outside of the air to achieve air circulation between the inside and outside of the cabin.

[0035] Optionally, the cross-sectional shape and size of the ventilation channel 11 are consistent with the cross-sectional shape and size of the vent.

[0036] This broadband noise reduction and ventilation superstructure, while ensuring sound absorption and noise reduction functions, can accurately connect with the ventilation frame body 2 without affecting the installation of the ventilation frame body 2 on the vehicle body. On the other hand, it ensures the original ventilation function and does not change the original ventilation volume of the ventilation frame, fully meeting the normal use needs of the vehicle.

[0037] Optionally, the ventilation frame body 2 is provided with a buckle seat 21, and the broadband noise reduction ventilation superstructure is provided with a buckle head 13 that engages with the buckle seat 21. Figure 2 The diagram shows the snap-fit ​​connection between the ventilation frame body 2 and the broadband noise reduction ventilation superstructure, which is easy to install.

[0038] In the manufacturing process of this broadband noise reduction and ventilation superstructure, the layout and size parameters of the sound-absorbing unit cavity 12 of the multi-layer sound-absorbing structure are first optimized by computer simulation software to ensure that it has good noise reduction performance and sufficient ventilation in the target noise frequency band. Then, 3D printing technology is used to manufacture the designed broadband noise reduction and ventilation superstructure to ensure the accuracy and consistency of the structure.

[0039] During installation, simply align the fabricated broadband noise-reducing ventilation superstructure with the clips on the ventilation frame body 2 and snap it on. After installation, when the vehicle's external air circulation is activated and the fan blades of the ventilation frame body 2 open, the air can flow smoothly through the ventilation channel 11 of the broadband noise-reducing ventilation superstructure, ensuring that the ventilation volume is not affected. At the same time, when external noise passes through the multi-layer sound-absorbing structure on the inner wall of the ventilation channel 11, it interacts with each sound-absorbing unit structure, and the noise energy of specific frequency bands is absorbed and reflected, thereby achieving a noise reduction effect.

[0040] Figure 4 The image shows a comparison of the sound insulation effects of the original vehicle ventilation frame, the existing noise-reducing ventilation frame, and a vehicle ventilation frame with a wideband noise-reducing superstructure. The image shows that the existing noise-reducing ventilation frame only has a significant noise reduction effect on motor whine noise in the 4000Hz–4500Hz frequency band; while the vehicle ventilation frame with a wideband noise-reducing superstructure (taking a frame with a three-layer sound-absorbing structure as an example) can effectively reduce noise in the 3900Hz–4850Hz frequency band at the same sound insulation level as the existing noise-reducing ventilation frame, thus broadening the noise reduction frequency band and resulting in a more significant noise reduction effect.

[0041] After real-vehicle verification, after installing this wideband noise reduction and ventilation superstructure, the motor noise inside the vehicle was significantly reduced when the external air circulation was turned on, and the ventilation volume was not significantly different from that without the structure, which fully met the normal use needs of the vehicle.

[0042] In other embodiments, the ventilation frame body 2 and the broadband noise reduction ventilation superstructure are respectively provided with corresponding screw holes, and the ventilation frame body 2 and the broadband noise reduction ventilation superstructure are fixed together by bolts. This installation method is more stable and is suitable for some scenarios with high installation strength requirements.

[0043] In summary, this broadband noise-reducing ventilation superstructure and automotive ventilation frame have the following advantages: 1) Superior wideband noise reduction effect for motor noise: Through the collaborative design of multi-layer sound absorption structure, it can cover a wider frequency range of motor noise. Compared with the existing structure, it significantly widens the overall noise reduction frequency band for motor noise, and the noise reduction depth and effect are also better. 2) Does not affect ventilation volume: The broadband noise reduction ventilation superstructure can be directly attached to the ventilation frame body 2 as a whole. Multiple sound absorption cavity groups are optimized in coordination. While achieving noise reduction function, it will not change the ventilation volume of the original ventilation frame, ensuring the normal realization of air pressure balance in the cabin. 3) Easy installation: No large-scale modification of the original ventilation frame structure is required. The broadband noise reduction ventilation super structure can be installed on the ventilation frame body 2 as a whole. The installation process is simple and convenient, which is conducive to later maintenance and replacement.

[0044] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A broadband noise-reducing and ventilation-type superstructure, characterized in that, The system includes a superstructure body (1), on which several air-permeable channels (11) are provided. Each air-permeable channel (11) has several sound-absorbing unit cavities (12) on its inner sidewall. The multiple sound-absorbing unit cavities (12) are distributed circumferentially along the air-permeable channel (11) to form a sound-absorbing cavity group. The multiple sound-absorbing cavity groups are distributed axially along the air-permeable channel (11) to form a multi-layer sound-absorbing structure. The size parameters and spacing of each sound-absorbing unit cavity (12) are designed for the noise frequency band to be reduced as needed.

2. The broadband noise-reducing ventilation superstructure according to claim 1, characterized in that, The cross-section of the sound-absorbing unit cavity (12) can be rectangular, cylindrical, or triangular.

3. The broadband noise-reducing ventilation superstructure according to claim 1, characterized in that, The sound-absorbing unit cavity (12) is a rectangular cavity with a length of 11mm to 14mm, a width of 7mm, and a depth of 3mm.

4. The broadband noise-reducing ventilation superstructure according to claim 3, characterized in that, The length direction of the sound-absorbing unit cavity (12) in the same sound-absorbing cavity group is arranged along the axial direction of the air-permeable channel (11) or perpendicular to the axial direction of the air-permeable channel (11).

5. The broadband noise-reducing ventilation superstructure according to claim 4, characterized in that, The length directions of the multiple sound-absorbing unit cavities (12) in the same multi-layer sound-absorbing structure are the same.

6. The broadband noise-reducing ventilation superstructure according to claim 5, characterized in that, The length direction of the sound-absorbing unit cavity (12) of at least one of the plurality of ventilation channels (11) is different from the length direction of the sound-absorbing unit cavity (12) of the other ventilation channels (11).

7. The broadband noise-reducing ventilation superstructure according to claim 1, characterized in that, The superstructure body (1) is integrally formed from metal materials or lightweight composite materials.

8. An automotive ventilation frame, comprising a ventilation frame body (2), characterized in that, The ventilation frame body (2) is equipped with a broadband noise reduction ventilation superstructure as described in any one of claims 1-7. The ventilation frame body (2) is provided with a plurality of ventilation openings, and the ventilation openings correspond one-to-one with and are connected to the ventilation channels (11) of the broadband noise reduction ventilation superstructure.

9. The automotive ventilation frame according to claim 8, characterized in that, The cross-sectional shape and size of the ventilation channel (11) are consistent with the cross-sectional shape and size of the ventilation opening.

10. The automotive ventilation frame according to claim 8, characterized in that, The ventilation frame body (2) is provided with a buckle seat (21), and the broadband noise reduction ventilation superstructure is provided with a buckle head (13) that engages with the buckle seat (21); Alternatively, the ventilation frame body (2) and the broadband noise reduction ventilation superstructure are respectively provided with corresponding screw holes, and the ventilation frame body (2) and the broadband noise reduction ventilation superstructure are fixedly connected by bolts.

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