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CN-224225009-U - Front wall sound insulation pad for low-frequency resonance suppression

CN224225009UCN 224225009 UCN224225009 UCN 224225009UCN-224225009-U

Abstract

The utility model provides a low-frequency resonance-suppression front wall sound insulation pad, and relates to the technical field of sound insulation pads. In the utility model, the low-frequency sound absorption layer is made of open-cell polyurethane foam, and residual low-frequency noise transmitted through the front wall plate is treated through friction loss of a porous material or acoustic energy absorption of a resonant cavity. The mass loading layer material is high density PVC board, increases the whole quality of sound insulation pad, promotes the separation ability to low frequency sound wave, and damping vibration attenuation layer material is pitch base damping fin, when the sound insulation pad main part received low frequency vibration, these materials can be with energy dissipation of other forms such as vibration energy conversion heat energy to reduce vibration amplitude, reduce the low frequency noise that produces because of the vibration. The low-frequency sound absorption layer, the mass load layer and the damping vibration attenuation layer are arranged, so that the blocking capability of the sound insulation pad main body to low-frequency sound waves is effectively improved.

Inventors

  • XIE JIANYU
  • Fu Benteng
  • XIE XIAORONG
  • WANG BINGJUN
  • HU XIMEI

Assignees

  • 江苏赛露达汽车隔音材料有限公司

Dates

Publication Date
20260512
Application Date
20250630

Claims (6)

  1. 1. The low-frequency resonance-suppression front wall sound insulation pad comprises a sound insulation pad body (1) and is characterized in that a substrate framework layer (5) is arranged in the sound insulation pad body (1), a low-frequency sound absorption layer (6) is fixedly arranged at the top of the substrate framework layer (5), a mass load layer (7) is fixedly arranged at the top of the low-frequency sound absorption layer (6), and a damping vibration reduction layer (8) is fixedly arranged at the top of the mass load layer (7).
  2. 2. The low-frequency resonance suppression front wall sound insulation pad according to claim 1, wherein four evenly-distributed storage grooves (4) are formed in the top of the sound insulation pad main body (1), and magnets (3) are fixedly arranged on the inner walls of the storage grooves (4).
  3. 3. The low-frequency resonance suppression front wall sound insulation pad according to claim 1, wherein mounting holes (2) are formed in four corners of the top of the sound insulation pad body (1) in a penetrating mode.
  4. 4. The low-frequency resonance suppression front wall sound insulation pad according to claim 1, wherein an electromagnetic shielding layer (9) is fixed on the top of the damping vibration attenuation layer (8), and a heat insulation buffer layer (10) is fixedly arranged on the top of the electromagnetic shielding layer (9).
  5. 5. A low-frequency resonance-suppressing front wall sound insulation pad as set forth in claim 4, wherein a surface protection layer (11) is fixedly installed on top of the heat insulation buffer layer (10).
  6. 6. A low-frequency resonance-suppressing front wall sound insulation pad according to claim 1, wherein the damping vibration attenuation layer (8) has a thickness of 1mm to 3mm.

Description

Front wall sound insulation pad for low-frequency resonance suppression Technical Field The utility model relates to the technical field of sound insulation pads, in particular to a low-frequency resonance-suppression front wall sound insulation pad. Background The development trend of the front wall sound insulation pad is generally environment-friendly, along with the increasingly strict environmental protection requirements, the automobile front wall sound insulation pad industry is developing towards the direction of environment-friendly materials, and environment-friendly materials such as bio-based polyurethane sound insulation pads and the like are produced in mass and applied to autonomous brand vehicle types. The weight reduction is also one of the important development trends in the industry, and the density of the product is reduced by adopting a micropore foaming technology and the like, so that the weight is reduced on the premise of not influencing the sound insulation performance, and the fuel economy or the endurance mileage of the automobile are improved. The intelligent active noise reduction technology is gradually applied to the field of the front wall plate sound insulation pad, such as the active noise reduction front wall plate integrated with the miniature sensor, and the acoustic characteristics can be adjusted in real time to adapt to different road conditions, so that the sound insulation effect is improved. In the prior art, low-frequency resonance is often represented as a 'buzzing sound' and a 'bombing sound', and the low-frequency resonance has strong penetrating power and is not easy to dissipate. The partial front wall sound insulation pad may hardly inhibit low-frequency resonance, so that low-frequency vibration of the engine cabin is not blocked when the vehicle runs, and the low-frequency vibration is directly transmitted into the cab, so that continuous low-frequency noise occurs in the vehicle, and the noise is more obvious especially under the working condition of high-speed running or high rotation speed of the engine, so that passengers feel uncomfortable such as dysphoria and dizziness. Disclosure of utility model The utility model aims to solve the problems that in the prior art, part of front wall sound insulation pads possibly hardly inhibit low-frequency resonance, low-frequency vibration of an engine cabin is not blocked and can be directly transmitted into a cockpit, so that continuous low-frequency noise is generated in a vehicle, and provides the low-frequency resonance inhibition front wall sound insulation pad. In order to achieve the aim, the low-frequency resonance suppression front wall sound insulation pad comprises a sound insulation pad body, wherein a substrate framework layer is arranged in the sound insulation pad body, a low-frequency sound absorption layer is fixedly arranged at the top of the substrate framework layer, a mass load layer is fixedly arranged at the top of the low-frequency sound absorption layer, and a damping vibration reduction layer is fixedly arranged at the top of the mass load layer. Preferably, four evenly distributed storage tanks are arranged at the top of the sound insulation pad main body, and magnets are fixedly arranged on the inner walls of the storage tanks. Preferably, the four corners at the top of the sound insulation pad main body are all penetrated and provided with mounting holes. Preferably, the electromagnetic shielding layer is fixed at the top of the damping vibration attenuation layer, and the heat insulation buffer layer is fixedly arranged at the top of the electromagnetic shielding layer. Preferably, a surface protection layer is fixedly arranged at the top of the heat insulation buffer layer. Preferably, the thickness of the damping vibration attenuation layer is 1mm to 3mm. Compared with the prior art, the utility model has the advantages and positive effects that, 1. In the utility model, the material of the substrate framework layer is glass fiber reinforced plastic, provides structural support for the sound insulation pad main body, prevents the deformation of the multi-layer material, and is used as an adhesion substrate of each functional layer. The low-frequency sound absorption layer is made of open-cell polyurethane foam, and residual low-frequency noise penetrating through the front coaming is treated through friction loss of a porous material or acoustic energy absorption of a resonant cavity. The mass loading layer material is high density PVC board, increases the whole quality of sound insulation pad, promotes the separation ability to low frequency sound wave, and damping vibration attenuation layer material is pitch base damping fin, when the sound insulation pad main part received low frequency vibration, these materials can be with energy dissipation of other forms such as vibration energy conversion heat energy to reduce vibration amplitude, reduce the low frequency noise that prod