Sound absorbing and noise reducing fiber felt

Abstract

The utility model relates to the technical field of chemical fiber felt, especially to sound absorption and noise reduction chemical fiber felt. Including high density felt body, the one side of high density felt body is provided with a plurality of first cone pit, the other side is provided with a plurality of second cone pit, the position of first cone pit and second cone pit corresponds, be provided with high density felt block in second cone pit, be provided with rubber layer between high density felt block and second cone pit. The utility model has good sound absorption and noise reduction effect.

Description

Technical Field

[0001] This utility model relates to the field of chemical fiber felt technology, and in particular to a sound-absorbing and noise-reducing chemical fiber felt. Background Technology

[0002] Synthetic fiber felt is a chemical fiber product made from chemical fibers, which has the functions of heat insulation or sound insulation and noise reduction. Our company's patent application number 202222589426.8 discloses a noise-reducing and flame-retardant synthetic fiber felt, which includes a first felt layer and a second felt layer. The first felt layer has a plurality of first depressions on one side, and the cross-section of the first depression is an isosceles triangle. A first protrusion is formed between adjacent first depressions. The second felt layer has a plurality of second depressions on the side close to the first felt layer. The cross-section of the second depression is the same as that of the first depression. A second protrusion is formed between adjacent second depressions. The positions of the first depressions and the second protrusions correspond to each other. A rubber layer is provided between the first felt layer and the second felt layer to bond them together. It has good sound absorption, sound insulation and noise reduction performance. However, its noise reduction effect on sound parallel to the thickness direction of the synthetic fiber felt (i.e., perpendicular to the surface of the synthetic fiber felt) is poor. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a sound-absorbing and noise-reducing synthetic fiber felt, which addresses the above-mentioned technical deficiencies.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a sound-absorbing and noise-reducing chemical fiber felt, including a high-density felt body, a plurality of first cone pits are provided on one side of the high-density felt body and a plurality of second cone pits are provided on the other side, the positions of the first cone pits and the second cone pits are corresponding, a high-density felt block is provided in the second cone pit, and a rubber layer is provided between the high-density felt block and the second cone pit.

[0005] To further optimize this technical solution, a low-density felt block is provided inside the first cone pit.

[0006] To further optimize this technical solution, the first cone pit is cone-shaped, and the apex angle of the cone is 90°.

[0007] To further optimize this technical solution, the second cone pit is cone-shaped, and the apex angle of the cone is 90°.

[0008] Compared with the prior art, the present invention has the following advantages: a number of first cone pits are provided on one side of the high-density felt body and a number of second cone pits are provided on the other side. High-density felt blocks are provided in the second cone pits and a rubber layer is provided between the two. The rubber layer can scatter sound outward, thereby increasing the path that the sound passes through in the high-density felt body and thus consuming more sound, which has a better sound absorption and noise reduction effect. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of a sound-absorbing and noise-reducing synthetic fiber felt.

[0010] In the diagram: 1. High-density felt body; 11. First cone pit; 12. Second cone pit; 2. Low-density felt block; 3. Rubber layer; 4. High-density felt block. Detailed Implementation

[0011] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0012] Detailed implementation method: combined with Figure 1 As shown, a sound-absorbing and noise-reducing synthetic fiber felt includes a high-density felt body 1 with a density greater than 0.5 g / cm³. The high-density felt body 1 has multiple first conical pits 11 on one side and multiple second conical pits 12 on the other side. The positions of the first conical pits 11 and the second conical pits 12 correspond to each other. The presence of the first conical pits 11 makes it easier for sound to enter the high-density felt body 1. A high-density felt block 4 is disposed within the second conical pit 12, and the density of the high-density felt block 4 can be the same as that of the high-density felt body 1. A rubber layer 3 is disposed between the high-density felt block 4 and the second conical pit 12. In use, sound enters the high-density felt body 1 from the side with the first conical pits 11. When it reaches the rubber layer 3, some of the sound is scattered around by the rubber layer 3, and the path of the scattered sound within the high-density felt body 1 is amplified, thus being more effectively absorbed. The remaining sound enters the rubber layer 3 for further absorption and then enters the high-density felt block 4 for further absorption. Therefore, the nonwoven fabric of this application has a good sound-absorbing and noise-reducing effect.

[0013] Furthermore, a low-density felt block 2 is provided in the first cone pit 11. The density of the low-density felt block 2 is preferably 0.2 g / cm³. Compared with the high-density felt body 1, sound can enter the low-density felt block 2 more easily, and the sound will be attenuated by the low-density felt block 2 when it enters and exits the first cone pit 11.

[0014] Furthermore, the first conical pit 11 is conical with a apex angle of 90°, and the second conical pit 12 is also conical with a apex angle of 90°. The axes of the first and second conical pits 11 and 12 are parallel to the thickness direction of the synthetic fiber felt. The rubber layer 3 has a conical surface with a certain thickness, combined with... Figure 1As shown, when sound traveling parallel to the thickness of the synthetic fiber felt (i.e., perpendicular to the surface of the synthetic fiber felt) reaches the rubber layer 3, it will be reflected in a direction nearly perpendicular to the thickness of the synthetic fiber felt. This results in a longer path within the high-density felt body 1, leading to greater sound loss. Figure 1 As can be seen, the sound reaching the lower part of rubber layer 3 is easily reflected and then reaches the lower part of another rubber layer 3. Part of it enters rubber layer 3 and high-density felt block 4 and is consumed, while the other part is reflected upwards. The reflected sound (which is much weaker than the sound intensity when it first enters high-density felt block 1) travels a distance that is basically more than twice the thickness of high-density felt block 1 from the point of entry into high-density felt block 1, and is therefore consumed more. The sound reaching the upper part of rubber layer 3 is reflected by another rubber layer 3 at a smaller proportion. Therefore, (although the high-density felt block 1 above the top of rubber layer 3 is thinner than other parts, the sound entering the high-density felt block 1 from top to bottom from the position corresponding to the top of rubber layer 3) is consumed more.

[0015] The specific embodiments described above do not constitute a limitation of this utility model. Any modifications, equivalent substitutions, or improvements made to the above embodiments should be included within the protection scope of this utility model.

Claims

1. A sound-absorbing and noise-reducing synthetic fiber felt, comprising a high-density felt body (1), characterized in that: The high-density felt (1) has multiple first cone pits (11) on one side and multiple second cone pits (12) on the other side. The positions of the first cone pits (11) and the second cone pits (12) are corresponding. A high-density felt block (4) is provided in the second cone pit (12). A rubber layer (3) is provided between the high-density felt block (4) and the second cone pit (12).

2. The sound-absorbing and noise-reducing synthetic fiber felt according to claim 1, characterized in that: Low-density felt blocks (2) are provided in the first cone pit (11).

3. The sound-absorbing and noise-reducing synthetic fiber felt according to any one of claims 1-2, characterized in that: The first cone pit (11) is conical, and the apex angle of the cone is 90°.

4. The sound-absorbing and noise-reducing synthetic fiber felt according to any one of claims 1-2, characterized in that: The second cone pit (12) is conical, and the apex angle of the cone is 90°.

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