Low-frequency resonance suppression front wall sound insulation pad

Abstract

The utility model provides a low-frequency resonance suppression front wall sound insulation pad, which relates to the technical field of sound insulation pads and comprises a sound insulation pad main body, and a base material framework layer is arranged in the sound insulation pad main body. According to the utility model, the low-frequency sound absorption layer is made of the open-cell polyurethane foam, and residual low-frequency noise penetrating through the dash panel is treated through friction loss of a porous material or sound energy absorption of the resonant cavity. The mass load layer is made of a high-density PVC plate, the overall mass of the sound insulation pad is increased, the blocking capacity to low-frequency sound waves is improved, the damping vibration attenuation layer is made of asphalt-based damping fins, when the sound insulation pad body is subjected to low-frequency vibration, the materials can convert vibration energy into heat energy and other forms of energy to be dissipated, and therefore the vibration amplitude is reduced, and the sound insulation pad has the good sound insulation effect. And low-frequency noise generated by vibration is reduced. And by arranging the low-frequency sound absorption layer, the mass load layer and the damping vibration attenuation layer, the low-frequency sound wave blocking capacity of the sound insulation pad body is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of sound insulation pad technology, and in particular to a front sound insulation pad for suppressing low-frequency resonance. Background Technology

[0002] Current development trends in front panel sound insulation pads generally include: Environmental friendliness: With increasingly stringent environmental requirements, the automotive front panel sound insulation pad industry is moving towards environmentally friendly materials. For example, bio-based polyurethane sound insulation pads and other environmentally friendly materials have achieved mass production and are being used in domestic brand vehicles. Lightweighting: Lightweighting is also a significant industry trend. By employing technologies such as microporous foaming, product density is reduced, decreasing weight without compromising sound insulation performance, thus improving fuel economy or driving range. Intelligentization: Intelligent active noise cancellation technology is gradually being applied to the front panel sound insulation pad field. For example, active noise cancellation front panels integrating micro-sensors can adjust acoustic characteristics in real time to adapt to different road conditions, improving sound insulation performance.

[0003] In existing technologies, low-frequency resonance often manifests as a "humming" or "roaring" sound, which is highly penetrating and difficult to dissipate. Some front bulkhead sound insulation pads may not be able to suppress low-frequency resonance, which may result in low-frequency vibrations from the engine compartment not being blocked when the vehicle is in motion, and directly transmitting them into the passenger cabin, causing continuous low-frequency noise inside the vehicle, especially at high speeds or when the engine is running at high RPMs, causing passengers to experience discomfort such as irritability and dizziness. Utility Model Content

[0004] The purpose of this invention is to address the problem that some front bulkhead sound insulation pads in the existing technology may have difficulty suppressing low-frequency resonance, and the low-frequency vibrations of the engine compartment are not blocked and will be directly transmitted to the passenger compartment, resulting in continuous low-frequency noise inside the vehicle. Therefore, this invention proposes a front bulkhead sound insulation pad for suppressing low-frequency resonance.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a low-frequency resonance suppression front sound insulation pad, comprising a sound insulation pad body, wherein a substrate skeleton layer is provided inside the sound insulation pad body, a low-frequency sound-absorbing layer is fixedly installed on the top of the substrate skeleton layer, a mass load layer is fixedly installed on the top of the low-frequency sound-absorbing layer, and a damping vibration reduction layer is fixedly installed on the top of the mass load layer.

[0006] Preferably, the top of the sound insulation pad body has four evenly distributed storage slots, and magnets are fixedly installed on the inner wall of the storage slots.

[0007] Preferably, the sound insulation pad body has mounting holes through all four corners of its top.

[0008] Preferably, an electromagnetic shielding layer is fixed on top of the damping and vibration reduction layer, and a heat insulation buffer layer is fixedly installed on top of the electromagnetic shielding layer.

[0009] Preferably, a surface protective layer is fixedly installed on the top of the heat insulation buffer layer.

[0010] Preferably, the thickness of the damping layer is 1 mm to 3 mm.

[0011] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0012] 1. In this utility model, the substrate skeleton layer is made of glass fiber reinforced plastic, providing structural support for the main body of the sound insulation pad, preventing deformation of the multi-layered materials, and serving as the attachment base for each functional layer. The low-frequency sound-absorbing layer is made of open-cell polyurethane foam, which processes residual low-frequency noise transmitted through the front panel through frictional loss of the porous material or absorption of sound energy by the resonant cavity. The mass load layer is made of high-density PVC board, increasing the overall mass of the sound insulation pad and improving its ability to block low-frequency sound waves. The damping and vibration reduction layer is made of asphalt-based damping sheet. When the main body of the sound insulation pad is subjected to low-frequency vibration, these materials can convert vibration energy into heat energy and other forms of energy dissipation, thereby reducing the vibration amplitude and reducing the low-frequency noise generated by vibration. The combination of the low-frequency sound-absorbing layer, the mass load layer, and the damping and vibration reduction layer effectively improves the sound insulation pad's ability to block low-frequency sound waves.

[0013] 2. In this utility model, during installation, the worker attaches the sound insulation pad body to the mounting plate. At this time, the magnet is attracted to the mounting plate by magnetic force. The worker can then install the sound insulation pad body on the mounting plate through the mounting holes, preventing the sound insulation pad body from shaking during installation and improving installation efficiency. Attached Figure Description

[0014] Figure 1 This utility model provides an overall three-dimensional view of a front sound insulation pad for suppressing low-frequency resonance;

[0015] Figure 2 This utility model provides a cross-sectional view of the main body of a sound insulation pad for suppressing low-frequency resonance in the front enclosure;

[0016] Figure 3 This invention presents a cross-sectional layered schematic diagram of a front sound insulation pad for suppressing low-frequency resonance.

[0017] Legend: 1. Sound insulation pad body; 2. Mounting hole; 3. Magnet; 4. Storage slot; 5. Substrate skeleton layer; 6. Low frequency sound absorption layer; 7. Mass load layer; 8. Damping and vibration reduction layer; 9. Electromagnetic shielding layer; 10. Heat insulation buffer layer; 11. Surface protective layer. Detailed Implementation

[0018] 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.

[0019] 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.

[0020] Example 1, as Figures 1-3 As shown, this utility model provides a low-frequency resonance suppression front sound insulation pad, including a sound insulation pad body 1, a substrate skeleton layer 5 is provided inside the sound insulation pad body 1, a low-frequency sound absorption layer 6 is fixedly installed on the top of the substrate skeleton layer 5, a mass load layer 7 is fixedly installed on the top of the low-frequency sound absorption layer 6, and a damping vibration reduction layer 8 is fixedly installed on the top of the mass load layer 7.

[0021] The overall effect of Embodiment 1 is as follows: the substrate skeleton layer 5, made of glass fiber reinforced plastic, provides structural support for the sound insulation pad body 1, prevents deformation of the multi-layered materials, and serves as the attachment base for each functional layer. The low-frequency sound-absorbing layer 6, made of open-cell polyurethane foam, treats residual low-frequency noise transmitted through the front panel through frictional loss of the porous material or absorption of sound energy by the resonant cavity. The mass load layer 7, made of high-density PVC board, increases the overall mass of the sound insulation pad, improving its ability to block low-frequency sound waves. The damping and vibration reduction layer 8, made of asphalt-based damping sheet, can dissipate vibration energy into heat or other forms of energy when the sound insulation pad body 1 is subjected to low-frequency vibration, thereby reducing the vibration amplitude and lowering the low-frequency noise generated by vibration. The arrangement of the low-frequency sound-absorbing layer 6, the mass load layer 7, and the damping and vibration reduction layer 8 effectively improves the ability of the sound insulation pad body 1 to block low-frequency sound waves.

[0022] Example 2, as Figures 1-3 As shown, the top of the sound insulation pad body 1 is provided with four evenly distributed storage slots 4. Magnets 3 are fixedly installed on the inner wall of the storage slots 4. When the staff attaches the sound insulation pad body 1 to the mounting plate, the magnets 3 are attracted to the mounting plate by magnetic force, which prevents the sound insulation pad body 1 from shaking during installation.

[0023] Furthermore, mounting holes 2 are provided through the four corners of the top of the sound insulation pad body 1, and the staff can install the sound insulation pad body 1 onto the mounting plate through the mounting holes 2.

[0024] Furthermore, an electromagnetic shielding layer 9 is fixed to the top of the damping and vibration reduction layer 8, and a heat insulation buffer layer 10 is fixedly installed on top of the electromagnetic shielding layer 9. The electromagnetic shielding layer 9 is made of copper-clad steel, which effectively shields the electromagnetic radiation generated by the electric vehicle motor controller and absorbs the vibration energy transmitted through the structure by the high-frequency electromagnetic noise of the motor. The heat insulation buffer layer 10 is made of aluminum foil reflective layer + glass wool felt, which blocks the transmission of high temperature from the engine compartment to the passenger compartment, and buffers the impact of mechanical vibration on the sound insulation pad.

[0025] Furthermore, a surface protective layer 11 is fixedly installed on the top of the heat insulation buffer layer 10. The surface protective layer 11 is made of wear-resistant PU coating to prevent the sound insulation pad body 1 from being affected by moisture, oil stains, and mechanical wear, while also meeting the flame retardant requirements of automotive interiors.

[0026] Furthermore, the thickness of the damping layer 8 is 1mm to 3mm. The damping layer 8 is made of asphalt-based damping sheet. When the sound insulation pad body 1 is subjected to low-frequency vibration, these materials can convert the vibration energy into heat energy and other forms of energy to dissipate, thereby reducing the vibration amplitude and reducing the low-frequency noise generated by the vibration.

[0027] The effect achieved by the entire embodiment 2 is that during installation, the staff attaches the sound insulation pad body 1 to the mounting plate. At this time, the magnet 3 is attracted to the mounting plate by magnetic force. The staff can then install the sound insulation pad body 1 on the mounting plate through the mounting hole 2, preventing the sound insulation pad body 1 from shaking during installation and improving installation efficiency.

[0028] Working Principle: The substrate skeleton layer 5 is made of glass fiber reinforced plastic, providing structural support for the main body 1 of the sound insulation pad, preventing deformation of the multi-layered materials, and serving as the attachment base for each functional layer. The low-frequency sound-absorbing layer 6 is made of open-cell polyurethane foam, which processes residual low-frequency noise transmitted through the front bulkhead through frictional loss of porous materials or absorption of sound energy by the resonant cavity. The mass load layer 7 is made of high-density PVC board, increasing the overall mass of the sound insulation pad and improving its ability to block low-frequency sound waves. The damping and vibration reduction layer 8 is made of asphalt-based damping sheet. When the main body 1 of the sound insulation pad is subjected to low-frequency vibration, these materials can convert vibration energy into heat energy and other forms of energy dissipation, thereby reducing the vibration amplitude and reducing low-frequency noise caused by vibration. The electromagnetic shielding layer 9 is made of copper-clad steel, which provides shielding effectiveness against electromagnetic radiation generated by the electric vehicle motor controller, while absorbing vibration energy transmitted through the structure by high-frequency electromagnetic noise from the motor. The heat insulation buffer layer 10 is made of aluminum foil reflective layer + glass wool felt, which blocks the transmission of high temperature from the engine compartment to the cockpit, while buffering the impact of mechanical vibration on the sound insulation pad. The surface protective layer 11 is made of wear-resistant PU coating to prevent the sound insulation pad body 1 from being affected by moisture, oil stains, and mechanical wear, while also meeting the flame-retardant requirements of automotive interiors. The inclusion of a low-frequency sound-absorbing layer 6, a mass-load layer 7, a damping and vibration-damping layer 8, an electromagnetic shielding layer 9, a heat-insulating buffer layer 10, and a surface protective layer 11 effectively improves the sound insulation pad body 1's ability to block low-frequency sound waves, its electromagnetic shielding capability, its heat insulation capability, and its wear resistance. During installation, the worker attaches the sound insulation pad body 1 to the mounting plate. At this point, the magnet 3 is magnetically attracted to the mounting plate, allowing the worker to install the sound insulation pad body 1 through the mounting holes 2, preventing the sound insulation pad body 1 from shaking during installation and improving installation efficiency.

[0029] 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 low-frequency resonance suppression front sound insulation pad, comprising a sound insulation pad body (1), characterized in that: The sound insulation pad body (1) has a substrate skeleton layer (5) inside. A low-frequency sound-absorbing layer (6) is fixedly installed on the top of the substrate skeleton layer (5). A mass load layer (7) is fixedly installed on the top of the low-frequency sound-absorbing layer (6). A damping vibration reduction layer (8) is fixedly installed on the top of the mass load layer (7).

2. The low-frequency resonance suppression front sound insulation pad according to claim 1, characterized in that: The sound insulation pad body (1) has four evenly distributed storage slots (4) on its top, and magnets (3) are fixedly installed on the inner wall of the storage slots (4).

3. The low-frequency resonance suppression front sound insulation pad according to claim 1, characterized in that: The sound insulation pad body (1) has mounting holes (2) through the four corners of its top.

4. The low-frequency resonance suppression front sound insulation pad according to claim 1, characterized in that: The damping and vibration reduction layer (8) is fixed with an electromagnetic shielding layer (9) on top, and a heat insulation buffer layer (10) is fixedly installed on top of the electromagnetic shielding layer (9).

5. A low-frequency resonance suppression front sound insulation pad according to claim 4, characterized in that: A surface protective layer (11) is fixedly installed on the top of the heat insulation buffer layer (10).

6. The low-frequency resonance suppression front sound insulation pad according to claim 1, characterized in that: The thickness of the damping layer (8) is 1 mm to 3 mm.

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