Multi-band directional sound insulation front wall pad

Abstract

The utility model discloses a multi-band directional sound insulation front wall pad, relates to the technical field of automobile appliances, and comprises an outer noise reduction layer, a broadband sound insulation layer, a sound absorption resonance layer and an adhesive layer, the adhesive layer is fixedly connected to the top surface of the outer noise reduction layer, the broadband sound insulation layer is fixedly connected to the bottom surface of the outer noise reduction layer, and the sound absorption resonance layer is fixedly connected to the bottom surface of the broadband sound insulation layer. The outer noise reduction layer is used as the first layer in contact with an engine compartment, the high elasticity and flexibility of the outer noise reduction layer can absorb idling vibration of an engine, solid sound transmission is reduced, the noise reduction effect is good, the noise reduction effect is good, and the noise reduction effect is good. The matched critical frequency of the aluminum plate is damaged through the corrugated surface of the double-layer corrugated aluminum alloy plate, medium-high frequency band sound insulation troughs are avoided, gaps between the aluminum plates are prevented from being filled with damping glue, vibration of the aluminum plates is restrained, secondary noise radiation generated by vibration is reduced, and the overall sound insulation performance is improved.

Description

Technical Field

[0001] This utility model relates to the field of automotive accessories technology, and in particular to a multi-band directional sound insulation front panel pad. Background Technology

[0002] The front bulkhead of a car is a key sound insulation component installed between the passenger compartment and the engine compartment. It is mainly used to block the transmission of engine vibration noise, mechanical noise and airflow noise to the passenger compartment. With the increasing demand for driving and riding comfort from consumers, and the acoustic challenges brought about by the high-frequency noise of electric motors in new energy vehicles, traditional single-function sound insulation materials are no longer able to meet the requirements for wide-bandwidth, directional and lightweight sound insulation.

[0003] However, in existing technologies, traditional soundproof front panel pads mostly use porous sound-absorbing materials, which are relatively simple in dealing with mid-to-high frequency noise and cannot effectively deal with the impact of noise in different frequency bands. Furthermore, if areas such as wire harness perforations are not specially treated, they can easily become the main leakage channels for high-frequency noise, affecting the soundproofing effect of the front panel pad. Utility Model Content

[0004] The purpose of this invention is to address the problems that traditional soundproof front panel pads, which mostly use porous sound-absorbing materials, have a limited range of solutions for mid-to-high frequency noise, cannot effectively address the impact of noise in different frequency bands, and whose wire harness perforations and other areas, when not specially treated, easily become major leakage channels for high-frequency noise, affecting the soundproofing effect of the front panel pad. Therefore, a multi-frequency directional soundproof front panel pad is proposed.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a multi-band directional sound insulation front panel pad, comprising an outer noise reduction layer, a broadband sound insulation layer, a sound absorption and resonance layer, and an adhesive layer. The adhesive layer is fixedly connected to the top surface of the outer noise reduction layer, the broadband sound insulation layer is fixedly connected to the bottom surface of the outer noise reduction layer, and the sound absorption and resonance layer is fixedly connected to the bottom surface of the broadband sound insulation layer. The broadband sound insulation layer comprises damping adhesive and an aluminum alloy plate. The aluminum alloy plate is provided with a double layer, and the surface of the aluminum alloy plate is corrugated and alternately stacked with damping adhesive. Sealing strips are fixedly connected to the outer edges of the outer noise reduction layer, the broadband sound insulation layer, and the sound absorption and resonance layer.

[0006] Preferably, the outer noise reduction layer includes a rubber pad, a honeycomb damping sheet, and a polyester fiber layer, wherein the rubber pad is fixedly connected to the top surface of the honeycomb damping sheet, and the bottom surface of the adhesive layer is fixedly connected to the top surface of the rubber pad.

[0007] Preferably, the polyester fiber layer is fixedly connected to the bottom surface of the honeycomb damping sheet.

[0008] Preferably, the sound-absorbing resonant layer includes a sound-absorbing foam layer, a threading hole, a sealing sleeve, an elastic film, and a cavity. The threading hole is formed through the interior of the sound-absorbing foam layer, and the sealing sleeve is fixedly connected to the inner wall of the threading hole.

[0009] Preferably, the elastic film is fixedly connected to the bottom surface of the sound-absorbing foam layer, the cavity is disposed inside the sound-absorbing foam layer, and the cavity has multiple different sizes.

[0010] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0011] 1. In this utility model, the outer noise reduction layer, as the first layer in contact with the engine compartment, has high elasticity and flexibility to absorb engine idling vibration and reduce solid-borne sound transmission. The corrugated surface of the double-layer corrugated aluminum alloy plate breaks the critical frequency of the aluminum plate, avoiding the mid-to-high frequency sound insulation trough. The damping adhesive fills the gaps between the aluminum plates, suppresses the vibration of the aluminum plates, reduces the secondary noise radiation caused by vibration, and improves the overall sound insulation performance.

[0012] 2. In this invention, the sound-absorbing foam layer contains cavities of different sizes that work in conjunction with an elastic film to resonate and absorb mid-frequency engine noise. The elasticity of the film allows for adjustable resonance frequencies, enabling the structure to adapt to noise frequency variations under different operating conditions. The sealing sleeve design for the wiring holes ensures strong compatibility for the front panel installation and does not affect vehicle wiring. Compared to a single resonance structure, the resonator array can cover a wider frequency band and increase sound absorption. Attached Figure Description

[0013] Figure 1 This utility model provides a structural schematic diagram of a multi-band directional sound insulation front panel pad;

[0014] Figure 2 This utility model provides a structural schematic diagram of a multi-band directional sound insulation front panel outer noise reduction layer;

[0015] Figure 3 This utility model presents a structural schematic diagram of a multi-band directional sound insulation front panel pad sound-absorbing resonance layer.

[0016] Legend: 1. External noise reduction layer; 11. Rubber pad; 12. Honeycomb damping sheet; 13. Polyester fiber layer; 2. Broadband sound insulation layer; 21. Damping adhesive; 22. Aluminum alloy plate; 3. Sound absorption and resonance layer; 31. Sound absorption foam layer; 32. Wiring hole; 33. Sealing sleeve; 34. Elastic film; 35. Cavity; 4. Adhesive layer; 5. Sealing strip. Detailed Implementation

[0017] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0018] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0019] Example: Figure 1 - Figure 3 As shown, this utility model provides a multi-band directional sound insulation front panel pad, including an outer noise reduction layer 1, a broadband sound insulation layer 2, a sound absorption and resonance layer 3, and an adhesive layer 4. The adhesive layer 4 is fixedly connected to the top surface of the outer noise reduction layer 1, the broadband sound insulation layer 2 is fixedly connected to the bottom surface of the outer noise reduction layer 1, and the sound absorption and resonance layer 3 is fixedly connected to the bottom surface of the broadband sound insulation layer 2. The broadband sound insulation layer 2 includes damping adhesive 21 and an aluminum alloy plate 22. The aluminum alloy plate 22 is double-layered, and its surface is corrugated and alternately stacked with the damping adhesive 21. Sealing strips 5 are fixedly connected to the outer edges of the outer noise reduction layer 1, the broadband sound insulation layer 2, and the sound absorption and resonance layer 3. The outer noise reduction layer 1 includes a rubber pad. 11. A honeycomb damping sheet 12 and a polyester fiber layer 13 are provided. A rubber pad 11 is fixedly connected to the top surface of the honeycomb damping sheet 12. The bottom surface of the adhesive layer 4 is fixedly connected to the top surface of the rubber pad 11. The polyester fiber layer 13 is fixedly connected to the bottom surface of the honeycomb damping sheet 12. The sound-absorbing resonance layer 3 includes a sound-absorbing foam layer 31, a wire hole 32, a sealing sleeve 33, an elastic film 34, and a cavity 35. The wire hole 32 is opened through the interior of the sound-absorbing foam layer 31. The sealing sleeve 33 is fixedly connected to the inner wall of the wire hole 32. The elastic film 34 is fixedly connected to the bottom surface of the sound-absorbing foam layer 31. The cavity 35 is provided inside the sound-absorbing foam layer 31 and has multiple different sizes.

[0020] The specific settings and functions of this embodiment are described in detail below. The rubber pad 11, as the first layer in contact with the engine compartment, can absorb engine idling vibration and reduce solid-borne sound due to its high elasticity and flexibility. At the same time, the damping characteristics of the rubber suppress the resonance of the metal sheet metal and reduce the transmission efficiency of low-frequency noise. The honeycomb damping sheet 12 enhances resonance loss and the polyester fiber layer 13 are set up. The combination of the three layers effectively reduces the low-frequency noise caused by engine compartment vibration. The corrugated surface of the double-layer corrugated aluminum alloy plate 22 breaks the critical frequency of the aluminum plate, avoiding the sound insulation trough in the mid-to-high frequency range. The damping adhesive 21 fills the gaps between the aluminum plates, suppresses the vibration of the aluminum plates, reduces the secondary noise radiation caused by vibration, and improves the overall sound insulation performance. The cavity 35 of different sizes inside the sound-absorbing foam layer 31 cooperates with the elastic film 34 to absorb the resonance of the engine mid-frequency noise. The elasticity of the thin film allows for adjustable resonant frequency, enabling the structure to adapt to noise frequency changes under different operating conditions. The design of the wiring hole 32 and the sealing sleeve 33 ensures strong compatibility for the front bulkhead installation and does not affect vehicle wiring. Compared with a single resonant structure, the resonator array can cover a wider frequency band and improve sound absorption.

[0021] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A multi-band directional sound insulation front panel pad, characterized in that: It includes an outer noise reduction layer (1), a broadband sound insulation layer (2), a sound absorption resonance layer (3), and an adhesive layer (4). The adhesive layer (4) is fixedly connected to the top surface of the outer noise reduction layer (1), the broadband sound insulation layer (2) is fixedly connected to the bottom surface of the outer noise reduction layer (1), and the sound absorption resonance layer (3) is fixedly connected to the bottom surface of the broadband sound insulation layer (2). The broadband sound insulation layer (2) includes a damping adhesive (21) and an aluminum alloy plate (22). The aluminum alloy plate (22) is provided with a double layer. The surface of the aluminum alloy plate (22) is corrugated and alternately stacked with the damping adhesive (21). The outer edges of the outer noise reduction layer (1), the broadband sound insulation layer (2), and the sound absorption resonance layer (3) are fixedly connected with sealing strips (5).

2. The multi-band directional sound insulation front panel pad according to claim 1, characterized in that: The outer noise reduction layer (1) includes a rubber pad (11), a honeycomb damping sheet (12) and a polyester fiber layer (13). The rubber pad (11) is fixedly connected to the top surface of the honeycomb damping sheet (12), and the bottom surface of the adhesive layer (4) is fixedly connected to the top surface of the rubber pad (11).

3. The multi-band directional sound insulation front panel pad according to claim 2, characterized in that: The polyester fiber layer (13) is fixedly connected to the bottom surface of the honeycomb damping sheet (12).

4. The multi-band directional sound insulation front panel pad according to claim 1, characterized in that: The sound-absorbing resonance layer (3) includes a sound-absorbing foam layer (31), a wire hole (32), a sealing sleeve (33), an elastic film (34), and a cavity (35). The wire hole (32) is opened through the interior of the sound-absorbing foam layer (31), and the sealing sleeve (33) is fixedly connected to the inner wall of the wire hole (32).

5. The multi-band directional sound insulation front panel pad according to claim 4, characterized in that: An elastic film (34) is fixedly connected to the bottom surface of the sound-absorbing foam layer (31), and a cavity (35) is set inside the sound-absorbing foam layer (31).

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