Sound-absorbing carpet and vehicle

Abstract

The utility model relates to the technical field of textiles, and discloses a sound-absorbing carpet and a vehicle. The sound-absorbing carpet sequentially comprises a lower layer (1), a gradient density fiber felt layer (2) and an upper hard layer (3) from bottom to top, the density of the gradient density fiber felt layer (2) is sequentially increased from bottom to top, and the density of the gradient density fiber felt layer (2) is smaller than that of the fiber felt layer (3). According to the sound-absorbing carpet, the low-frequency sound-absorbing capability of the automobile carpet can be improved, and wide range and strong sound absorption are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of textiles, in particular to a sound-absorbing carpet and a vehicle. Background Art

[0002] When sound waves are incident on porous materials, they can enter the material through the pores, causing the air in the pores to vibrate. Due to the viscous resistance of the air and the friction between the air molecules and the pore walls, the sound energy is converted into heat energy and sound is absorbed. Porous sound-absorbing materials have good sound absorption performance for high and medium frequencies, but the sound absorption performance of any single porous material for low and medium frequencies is poor, and it is difficult to cover the full frequency noise prevention requirements of the human ear. In particular, it is necessary to develop a sound-absorbing carpet that can improve the low-frequency sound absorption capacity of car carpets and achieve a wide sound range and strong sound absorption. Utility Model Content

[0003] The purpose of the utility model is to overcome the problem that the existing automotive carpet technology usually lacks wide-range sound absorption ability and is difficult to meet the growing comfort needs of consumers, and to provide a sound-absorbing carpet and a vehicle. The technical solution achieves a wide-range sound absorption effect that takes into account both high and low frequencies.

[0004] In order to achieve the above-mentioned purpose, the first aspect of the utility model provides a sound-absorbing carpet, which includes, from bottom to top, a lower layer, a gradient density fiber felt layer and an upper hard layer, wherein the density of the gradient density fiber felt layer increases from bottom to top, and the density of the gradient density fiber felt layer is less than the density of the upper hard layer.

[0005] Preferably, the lower layer comprises a screen layer and a film layer.

[0006] Preferably, the upper hard layer comprises a fiber felt layer and a needle-punched carpet surface layer.

[0007] Preferably, the density range of the gradient density fiber felt layer is 60-120 kg / m 3 .

[0008] Preferably, the gradient density fiber felt layer comprises at least a low-density fiber felt layer and a high-density fiber felt layer.

[0009] Preferably, the density of the high-density fiber felt layer is 5-60 kg / m higher than that of the low-density fiber felt layer. 3 .

[0010] Preferably, the density of the low-density fiber felt layer is 60-90 kg / m 3 .

[0011] Preferably, the density of the high-density fiber felt layer is 90-120 kg / m 3 .

[0012] Preferably, the density of the fiber felt layer is 250-350 kg / m higher than that of the high-density fiber felt layer. 3 .

[0013] Preferably, the density of the fiber felt layer is 350-450 kg / m 3 , the thickness of the fiber felt layer is 1-3 mm.

[0014] Preferably, the wire mesh layer is made of polyester material, the thickness of the wire mesh layer is 0.4-0.6 mm, the wire diameter of the wire mesh layer is 0.15-0.35 mm, and the opening size of the wire mesh layer is 0.5-1 mm.

[0015] Preferably, the film layer has a thickness of 0.05-0.2 mm, and is made of polyester material or polyethylene material.

[0016] Preferably, the low-density fiber felt layer, the high-density fiber felt layer and the fiber felt layer are each made of polyester material.

[0017] Preferably, the thickness of the low-density fiber felt layer is 4-8 mm, and the thickness of the high-density fiber felt layer is 4-8 mm.

[0018] Preferably, the surface layer of the needle-punched blanket is made of polyester material, the thickness of the surface layer of the needle-punched blanket is 1.5-2.5 mm, and the needle density of the surface layer of the needle-punched blanket is 1000-1200 thorns / cm 2 .

[0019] Preferably, the film layer of the screen layer is connected by regional bonding, the film layer and the low-density fiber felt layer are connected by regional bonding, the low-density fiber felt layer and the high-density fiber felt layer are melt-bonded with polyethylene, the high-density fiber felt layer and the fiber felt layer are melt-bonded with polyethylene, and the fiber felt layer and the needle-punched blanket surface layer are connected by needle-punched composite.

[0020] A second aspect of the utility model provides a vehicle, which comprises the above-mentioned sound-absorbing carpet.

[0021] Compared with the prior art, the technical solution of the utility model has the following advantages:

[0022] (1) The sound-absorbing carpet of the utility model applies the acoustic principle of resonance sound absorption, adds a silk screen + film acoustic structure at the bottom of the carpet, and utilizes the good low-frequency sound absorption performance of cavity resonance sound absorption to improve the low-frequency sound absorption performance of the carpet, thereby improving the problem that the previous carpet structure has poor effect in absorbing low-frequency sound waves;

[0023] (2) The sound-absorbing carpet of the utility model broadens the audio absorption band by compounding sound-absorbing layers of fiber felts of different densities, wherein low-density fibers can improve the sound absorption effect of medium and low frequencies, and high-density fibers can effectively absorb high-frequency sound waves, thereby achieving a wide-range sound absorption effect of 20-20,000 Hz that takes into account both high and low frequencies. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the sound-absorbing carpet described in the utility model.

[0025] Description of Reference Numerals

[0026] 1. Lower layer; 11. Silk screen layer; 12. Film layer; 2. Gradient density fiber felt layer; 21. Low density fiber felt layer; 22. High density fiber felt layer; 3. Upper hard layer; 31. Fiber felt layer; 32. Needle punched blanket surface layer. DETAILED DESCRIPTION

[0027] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0028] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0029] like Figure 1 As shown, the sound-absorbing carpet of the utility model includes a lower layer 1, a gradient density fiber felt layer 2 and an upper hard layer 3 from bottom to top, wherein the density of the gradient density fiber felt layer 2 increases from bottom to top, and the density of the gradient density fiber felt layer 2 is less than the density of the upper hard layer 3. According to the sound-absorbing carpet of the utility model, a wide sound range and strong sound absorption carpet structure is designed by combining sound-absorbing materials and sound-absorbing structures. Through the design of the low-frequency resonance sound absorption structure, the problem of the lack of low-frequency sound absorption ability of the previous automotive carpet can be effectively improved, and the low-frequency sound absorption ability of the automotive carpet can be significantly improved, so as to achieve a wide sound range and strong sound absorption.

[0030] In the sound-absorbing carpet of the utility model, the lower layer 1 may include a wire mesh layer 11 and a film layer 12. The mesh of the wire mesh layer 11 plays a role of constrained damping, dividing the surface of the film layer 12 into a number of small independent units. When the film layer 12 vibrates, the film in the grid-constrained independent unit will deform, increasing the friction between the film and the wire mesh layer 11, converting part of the energy into heat energy, and further improving the sound absorption effect.

[0031] In the sound-absorbing carpet of the utility model, the upper hard layer 3 may include a fiber felt layer 31 and a needle-punched carpet surface layer 32. The fiber felt layer 31 may be regarded as a rigid wall. The fiber felt layer 31 is made of a material with good rigidity and tensile strength to ensure that the carpet can maintain the stability of shape and size during use. The needle-punched carpet surface layer 32 has a low-frequency sound absorption effect.

[0032] In the sound-absorbing carpet of the present invention, the density range of the gradient density fiber felt layer 2 can be 60-120 kg / m 3 The gradient density fiber felt layer 2 provides a composite fiber felt sound-absorbing layer of different densities to broaden the audio absorption band. In the gradient density fiber felt layer 2, low-density fibers can improve the sound absorption effect of medium and low frequencies, and high-density fibers can effectively absorb high-frequency sound waves. Thus, a wide-range sound absorption effect of 20-20000Hz is achieved that takes into account both high and low frequencies.

[0033] In the sound-absorbing carpet described in the utility model, the gradient density fiber felt layer 2 may include at least a low-density fiber felt layer 21 and a high-density fiber felt layer 22. The number of fiber felt layers in the gradient density fiber felt layer 2 is more than 2 layers, specifically, it may be 2 layers, 3 layers, 4 layers, 5 layers or more layers. In actual application, when the number of fiber felt layers in the gradient density fiber felt layer 2 is more, the sound absorption performance of the sound-absorbing carpet is better, but at the same time, the cost and thickness are also higher. Considering the sound absorption performance, thickness and cost comprehensively, the gradient density fiber felt layer 2 preferably includes a low-density fiber felt layer 21 and a high-density fiber felt layer 22.

[0034] In the sound-absorbing carpet of the present invention, in order to take into account the wide-range sound-absorbing effect of both high-frequency and low-frequency, the density of the high-density fiber felt layer 22 is preferably 5-60 kg / m higher than the density of the low-density fiber felt layer 21. 3 , more preferably 10-50kg / m 3 , for example, 5kg / m 3 , 10kg / m 3 , 15kg / m 3 , 20kg / m 3 , 25kg / m 3 、30kg / m 3、35kg / m 3 , 40kg / m 3 , 45kg / m 3 , 50kg / m 3 , 55kg / m 3 or 60kg / m 3 .

[0035] In the sound-absorbing carpet of the present invention, in order to form a cavity resonance structure, the density of the fiber felt layer 31 is preferably 250-350 kg / m higher than the density of the high-density fiber felt layer 22. 3 , more preferably 275-325kg / m 3 , for example, 275 kg / m 3 , 280kg / m 3 、285kg / m 3 、290kg / m 3 、295kg / m 3 、300kg / m 3 、305kg / m 3 、310kg / m 3 、315kg / m 3 、320kg / m 3 or 325kg / m 3 .

[0036] In the sound-absorbing carpet of the present invention, in order to ensure that the structure has good low-frequency sound absorption performance, the density of the low-density fiber felt layer 21 is preferably 60-90 kg / m 3 , more preferably 70-80kg / m 3 , for example, 60 kg / m 3 、65kg / m 3 , 70kg / m 3 , 75kg / m 3 、80kg / m 3 、85kg / m 3 or 90kg / m 3 .

[0037] In the sound-absorbing carpet of the present invention, in order to significantly improve the low-frequency sound absorption performance, the density of the high-density fiber felt layer 22 is preferably 90-120 kg / m 3 , more preferably 100-110kg / m 3 , for example, 90 kg / m 3 , 95kg / m 3 , 100kg / m 3 , 105kg / m 3 , 110kg / m 3、115kg / m 3 or 120kg / m 3 .

[0038] In the sound-absorbing carpet of the present invention, in order to ensure that the carpet maintains its shape, the density of the fiber felt layer 31 is preferably 350-450 kg / m 3 , more preferably 375-425kg / m 3 , for example, 375 kg / m 3 、380kg / m 3 、385kg / m 3 、390kg / m 3 、395kg / m 3 , 400kg / m 3 , 405kg / m 3 , 410kg / m 3 , 415kg / m 3 or 420kg / m 3 The fiber felt layer 31 may have a thickness of 1-3 mm, preferably 1.5-2.5 mm.

[0039] In the sound-absorbing carpet described in the utility model, the material of the mesh layer 11 can be polyester material, and the thickness of the mesh layer 11 can be 0.4-0.6mm, and specifically can be 0.4mm, 0.45mm, 0.5mm, 0.55mm or 0.6mm. The wire diameter of the mesh layer 11 can be 0.15-0.35mm, and specifically can be 0.15mm, 0.20mm, 0.25mm, 0.30mm or 0.35mm. The opening size of the mesh layer 11 can be 0.5-1mm, and specifically can be 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm or 1mm.

[0040] In the sound-absorbing carpet of the utility model, in order to ensure that the sound waves pass through the film and enter the cavity behind it, the thickness of the film layer 12 is preferably 0.05-0.2mm, more preferably 0.05-0.15mm, and specifically can be 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm or 1mm. When the film layer 12 vibrates, the film in the grid-constrained independent unit will deform, increasing the friction between the film and the wire mesh layer 11 and the low-density fiber felt layer 21, converting part of the energy into heat energy, and further improving the sound absorption effect.

[0041] In the sound-absorbing carpet described in the utility model, in order to improve the low-frequency sound absorption ability of the carpet, the material of the film layer 12 is preferably polyester material or polyethylene material, and more preferably polyester material. The resonant sound absorption structure composed of the film layer 12 utilizes the Helmholtz resonance sound absorption mechanism. Structures or objects have their own natural frequencies. When the frequency of the sound wave is the same as the natural frequency of the structure or object, resonance will occur. The vibrating structure or object will convert part of the vibration energy into heat energy due to its own friction and friction with the air, which is equivalent to converting the sound energy causing the vibration into heat energy, thereby playing a role in sound absorption and noise reduction. Using this Helmholtz resonance sound absorption mechanism, a resonant sound absorption structure is constructed. The sound absorber absorbs sound energy by resonance, and the sound absorption coefficient is higher at low frequencies.

[0042] In the sound-absorbing carpet of the utility model, in order to improve the sound absorption effect of the carpet, the material of the low-density fiber felt layer 21, the high-density fiber felt layer 22 and the fiber felt layer 31 is preferably a polyester material, more preferably a polyester material. A cavity resonance structure is formed between the film layer 12 and the fiber felt layer 31, and the density is 60-90 kg / m 3 The low-density fiber felt layer 21 has a density of 90-120 kg / m 3 The high-density fiber felt layer 22 can be regarded as a sound-absorbing layer filled in the cavity. The film resonance sound-absorbing structure is a typical resonance sound-absorbing structure. Sound waves pass through the film layer 12 and enter the cavity between the film layer 12 and the fiber felt layer 31, causing the cavity to resonate and absorb sound. This structure is derived from the evolution of the Helmholtz resonance absorber. Therefore, the sound-absorbing carpet of the utility model has good low-frequency sound absorption performance.

[0043] In the sound-absorbing carpet described in the utility model, the thickness of the low-density fiber felt layer 21 can be 4-8mm, preferably 5-7mm. The thickness of the high-density fiber felt layer 22 can be 4-8mm, preferably 5-7mm. The sum of the thickness of the low-density fiber felt layer 21 and the thickness of the high-density fiber felt layer 22 can be 8-16mm, preferably 11-13mm. The film layer 12 and the cavity formed between the film layer 12 and the fiber felt layer 31 form a resonance system, which has a greater sound absorption effect near the resonance frequency of the system. The sound wave excites the resonant sound-absorbing structure to vibrate and maximize the amplitude, which consumes sound energy and absorbs sound. The resonance peak of this structure is 280-320Hz, which can significantly improve the low-frequency sound absorption performance.

[0044] In the sound-absorbing carpet of the utility model, the low-density fiber felt layer 21 and the high-density fiber felt layer 22 are medium and high-frequency sound-absorbing layers, and the fiber fineness of the low-density fiber felt layer 21 and the high-density fiber felt layer 22 can be 3-10 deniers respectively. Low fiber fineness can further increase the sound absorption coefficient. The density is 60-90kg / m 3 The low-density fiber felt layer 21 has a density of 90-120 kg / m 3 The composite structure of the high-density fiber felt layer 22 can broaden the sound absorption frequency and achieve a wide-range sound absorption effect.

[0045] In the sound-absorbing carpet of the present invention, the material of the needle-punched carpet surface layer 32 can be polyester material, the thickness of the needle-punched carpet surface layer 32 can be 1.5-2.5 mm, and the density of the needle-punched carpet surface layer 32 can be 500-600 kg / m 3 The needle punch density of the needle punched blanket surface layer 32 may be 1000-1200 needles / cm 2 The needle-punched holes on the needle-punched carpet surface layer 32 are similar to microporous plates, which can improve the low-frequency sound absorption effect. When the frequency is 200-300 Hz, the sound absorption coefficient of the sound-absorbing carpet is high and can reach above 0.3, preferably 0.4-0.5.

[0046] In the sound-absorbing carpet described in the utility model, the film layer 12 of the mesh layer 11 is connected by regional bonding, the film layer 12 is connected to the low-density fiber felt layer 21 by regional bonding, the low-density fiber felt layer 21 is connected to the high-density fiber felt layer 22 by polyethylene melt bonding, the high-density fiber felt layer 22 is connected to the fiber felt layer 31 by polyethylene melt bonding, and the fiber felt layer 31 is connected to the needle-punched carpet surface layer 32 by needle-punching composite.

[0047] In some embodiments, the sound-absorbing carpet of the utility model comprises, from bottom to top, a screen layer 11, a film layer 12, a low-density fiber felt layer 21, a high-density fiber felt layer 22, a fiber felt layer 31 and a needle-punched carpet surface layer 32, wherein the density of the low-density fiber felt layer 21, the density of the high-density fiber felt layer 22 and the density of the fiber felt layer 31 increase in sequence. The screen layer 11 is made of polyester material, the thickness of the screen layer 11 is 0.4-0.6 mm, the wire diameter of the screen layer 11 is 0.15-0.35 mm, and the opening size of the screen layer 11 is 0.5-1 mm. The thickness of the film layer 12 is 0.05-0.2 mm. The material of the film layer 12 is polyester material or polyethylene material. The material of the low-density fiber felt layer 21, the high-density fiber felt layer 22 and the fiber felt layer 31 is each polyester material. The density of the low-density fiber felt layer 21 is 60-90 kg / m 3The density of the high-density fiber felt layer 22 is 90-120 kg / m 3 The thickness of the low-density fiber felt layer 21 and the high-density fiber felt layer 22 are 4-8 mm respectively. The sum of the thickness of the low-density fiber felt layer 21 and the thickness of the high-density fiber felt layer 22 is 8-16 mm. The density of the fiber felt layer 31 is 350-450 kg / m 3 The fiber felt layer 31 has a thickness of 1-3 mm. The needle-punched blanket surface layer 32 is made of polyester material, has a thickness of 1.5-2.5 mm, and has a density of 500-600 kg / m 3 The needle punch density of the needle punched blanket surface layer 32 is 1000-1200 needles / cm 2. The film layer 12 of the wire mesh layer 11 is connected by regional gluing, the film layer 12 is connected to the low-density fiber felt layer 21 by regional gluing, the low-density fiber felt layer 21 is bonded to the high-density fiber felt layer 22 by polyethylene melt bonding, the high-density fiber felt layer 22 is bonded to the fiber felt layer 31 by polyethylene melt bonding, and the fiber felt layer 31 is connected to the needle-punched blanket surface layer 32 by needle-punching composite. Structures or objects have their own natural frequencies. When the frequency of sound waves is the same as the natural frequency of structures or objects, resonance will occur. The vibrating structure or object will convert part of the vibration energy into heat energy due to its own friction and friction with the air, which is equivalent to converting the sound energy causing vibration into heat energy, thereby playing a role in sound absorption and noise reduction. The film resonance sound absorption structure is a typical resonance sound absorption structure. Sound waves enter the cavity behind it through the film, causing the cavity to resonate and absorb sound. This structure is derived from the evolution of the Helmholtz resonance absorber and has good low-frequency sound absorption performance. A resonant sound-absorbing structure is constructed by a wire mesh layer 11, a film layer 12, a low-density fiber felt layer 21, a high-density fiber felt layer 22, a fiber felt layer 31 and a needle-punched carpet surface layer 32. The sound absorber absorbs sound energy by resonance, and the sound absorption coefficient is higher at low frequencies. The film layer 12 and the cavity formed between the film layer 12 and the fiber felt layer 31 form a resonance system, which has a greater sound absorption effect near the system resonance frequency. The sound wave excites the resonant sound-absorbing structure to vibrate and maximize the amplitude, which has the effect of consuming sound energy and absorbing sound. The resonance peak of this structure is at 280-320Hz, which can significantly improve the low-frequency sound absorption performance. When the automobile motor drive noise, engine and power system noise, and road and tire noise are transmitted to the bottom layer of the carpet, the film will vibrate and convert the sound energy into mechanical energy. The grid of the wire mesh layer 11 plays the role of constrained damping, dividing the surface of the film layer 12 into a number of small independent units. When the film layer 12 vibrates, the film in the grid-constrained independent unit will deform, increasing the friction between the film and the wire mesh layer 11 and the low-density fiber felt layer 21, converting part of the energy into heat energy, further improving the sound absorption effect. The composite structure formed by the low-density fiber felt layer 21 and the high-density fiber felt layer 22 can broaden the sound absorption frequency and achieve a wide-range sound absorption effect.

[0048] The utility model also provides a vehicle, which includes the above-mentioned sound-absorbing carpet. According to the vehicle of the utility model, by applying the above-mentioned sound-absorbing carpet to the vehicle, the problem that the previous vehicle carpet lacks low-frequency sound absorption capacity is effectively improved, the low-frequency sound absorption capacity of the vehicle carpet is significantly improved, and a wide sound range and strong sound absorption are achieved.

[0049] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including combining various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A sound-absorbing carpet, characterized in that: The sound-absorbing carpet comprises, from bottom to top, a lower layer (1), a gradient density fiber felt layer (2) and an upper hard layer (3), wherein the density of the gradient density fiber felt layer (2) increases from bottom to top, and the density of the gradient density fiber felt layer (2) is less than the density of the upper hard layer (3).

2. The sound-absorbing carpet according to claim 1, characterized in that: The lower layer (1) comprises a wire mesh layer (11) and a film layer (12).

3. The sound-absorbing carpet according to claim 2, characterized in that: The upper hard layer (3) comprises a fiber felt layer (31) and a needle-punched blanket surface layer (32).

4. The sound-absorbing carpet according to claim 3, characterized in that: The density range of the gradient density fiber felt layer (2) is 60-120 kg / m 3 .

5. The sound-absorbing carpet according to claim 4, characterized in that: The gradient density fiber felt layer (2) comprises at least a low-density fiber felt layer (21) and a high-density fiber felt layer (22).

6. The sound-absorbing carpet according to claim 5, characterized in that: The density of the high-density fiber felt layer (22) is 5-60 kg / m higher than the density of the low-density fiber felt layer (21). 3 .

7. The sound-absorbing carpet according to claim 5 or 6, characterized in that: The density of the low-density fiber felt layer (21) is 60-90 kg / m 3 .

8. The sound-absorbing carpet according to claim 5 or 6, characterized in that: The density of the high-density fiber felt layer (22) is 90-120 kg / m 3 .

9. The sound-absorbing carpet according to claim 8, characterized in that: The density of the fiber felt layer (31) is 250-350 kg / m higher than the density of the high-density fiber felt layer (22). 3 .

10. The sound-absorbing carpet according to claim 3 or 9, characterized in that: The density of the fiber felt layer (31) is 350-450 kg / m 3 The thickness of the fiber felt layer (31) is 1-3 mm.

11. The sound-absorbing carpet according to claim 2, characterized in that: The material of the wire mesh layer (11) is polyester material, the thickness of the wire mesh layer (11) is 0.4-0.6 mm, the wire diameter of the wire mesh layer (11) is 0.15-0.35 mm, and the opening size of the wire mesh layer (11) is 0.5-1 mm.

12. The sound-absorbing carpet according to claim 2, characterized in that: The thickness of the film layer (12) is 0.05-0.2 mm, and the material of the film layer (12) is polyester material or polyethylene material.

13. The sound-absorbing carpet according to claim 5 or 6, characterized in that: The low-density fiber felt layer (21), the high-density fiber felt layer (22) and the fiber felt layer (31) are each made of polyester material.

14. The sound-absorbing carpet according to claim 5, characterized in that: The thickness of the low-density fiber felt layer (21) is 4-8 mm, and the thickness of the high-density fiber felt layer (22) is 4-8 mm.

15. The sound-absorbing carpet according to claim 3, characterized in that: The material of the needle-punched blanket surface layer (32) is polyester material, the thickness of the needle-punched blanket surface layer (32) is 1.5-2.5 mm, and the needle-punching density of the needle-punched blanket surface layer (32) is 1000-1200 thorns / cm 2 .

16. The sound-absorbing carpet according to claim 5 or 6, characterized in that: The film layer (12) of the wire mesh layer (11) is connected by regional gluing, the film layer (12) and the low-density fiber felt layer (21) are connected by regional gluing, the low-density fiber felt layer (21) and the high-density fiber felt layer (22) are bonded by polyethylene melt bonding, the high-density fiber felt layer (22) and the fiber felt layer (31) are bonded by polyethylene melt bonding, and the fiber felt layer (31) and the needle-punched blanket surface layer (32) are connected by needle-punching composite method.

17. A vehicle, characterized in that: The vehicle comprises the sound-absorbing carpet according to any one of claims 1-16.

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