Sound-absorbing and noise-reducing chemical fiber felt
By adopting a convex cone through-hole design of a three-layer structure and a rubber layer in the chemical fiber felt, the problem of poor noise reduction due to increased thickness is solved, and the thickness reduction and sound absorption effect are improved under the same noise reduction effect are achieved.
Patent Information
- Application Number
- CN202421187097.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-29
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2034-05-29
AI Technical Summary
When the existing chemical fiber felt is thicker when achieving the noise reduction effect, it leads to poor noise reduction effect and increased thickness, making it difficult to meet the need to reduce the total thickness of the felt layer under the same noise reduction effect.
A three-layer chemical fiber felt structure is adopted, wherein a convex cone and a through hole are provided between the first and second rubber layers, a plurality of through holes on the second rubber layer, and a coaxial cone on the first rubber layer, through this structure, the same decrease is achieved. Reduce noise transmission under the noise effect and improve sound absorption effect.
While maintaining the noise reduction effect, the total thickness of the chemical fiber felt is reduced, and the sound absorption effect is improved through multiple reflections and penetration, reducing noise transmission, and suitable for environments such as noise chambers.
Smart Images
Figure CN222346468U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of non-woven fabrics, in particular to a sound-absorbing and noise-reducing chemical fiber felt. Background Art
[0002] Chemical fiber felt is a felt made of chemical fiber, which is generally used to cover the surface of objects to keep warm and reduce noise. Chemical fiber felt generally reduces noise through the principle of porous sound absorption (after the sound wave penetrates the pores of the material, it will cause friction between the fiber pores or other pores and the pore walls, so that the sound energy is converted into heat energy due to viscosity and thermal conductivity and consumed, and the remaining part penetrates the material to the outside). In the prior art, generally, a better noise reduction effect is achieved by increasing the thickness of the chemical fiber felt, that is, the thicker the thickness, the more the sound is weakened after passing through the chemical fiber felt, which leads to the thicker thickness of the chemical fiber felt in order to achieve the noise reduction effect. Utility Model Content
[0003] The technical problem to be solved by the utility model is to provide a sound-absorbing and noise-reducing chemical fiber felt in view of the above-mentioned technical deficiencies.
[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a sound-absorbing and noise-reducing chemical fiber felt, including a first felt layer, a first rubber layer is arranged on one side of the first felt layer, a plurality of convex cones are arranged on the side of the first rubber layer away from the first felt layer, a second rubber layer with a gap between the first rubber layer and the first rubber layer is arranged on the side away from the first felt layer, a through hole coaxial with the convex cone is arranged on the second rubber layer, a second felt layer is arranged in the gap between the first rubber layer and the second rubber layer, and a third felt layer is arranged on the side of the second rubber layer away from the first rubber layer.
[0005] To further optimize the technical solution, the diameter of the bottom surface of the convex cone is greater than the diameter of the through hole, and the vertex of the convex cone is located on a side of the through hole close to the first rubber layer.
[0006] To further optimize the technical solution, the cone angle of the convex cone is equal to 90°.
[0007] To further optimize the technical solution, a cone cylinder coaxial with the convex cone is provided on one side of the through hole close to the first rubber layer, and the outer wall of the convex cone is parallel to the inner wall of the cone cylinder on the cross section passing through the axis of the convex cone.
[0008] Compared with the prior art, the utility model has the following advantages: two rubber layers are arranged between the three layers of chemical fiber felt, and the total thickness of the felt layer can be smaller under the condition of the same noise reduction effect; a plurality of through holes are arranged on the second rubber layer, and a convex cone coaxial with the through holes is arranged on the first rubber layer, which improves the sound absorption effect while the noise passing through the first felt layer corresponding to the through holes will basically not increase. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 The figure is a schematic diagram of the structure of a sound-absorbing and noise-reducing chemical fiber felt.
[0010] In the figure: 1, first felt layer; 2, first rubber layer; 21, convex cone; 3, second rubber layer; 31, through hole; 32, cone cylinder; 4, second felt layer; 5, third felt layer. DETAILED DESCRIPTION
[0011] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in combination with specific implementation methods and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the utility model. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.
[0012] Specific implementation method: Combination Figure 1As shown, a sound-absorbing and noise-reducing chemical fiber felt comprises a first felt layer 1, a first rubber layer 2 is arranged on one side of the first felt layer 1, a plurality of convex cones 21 are arranged on the side of the first rubber layer 2 away from the first felt layer 1, the convex cones 21 are conical, a second rubber layer 3 with a gap therebetween is arranged on the side of the first rubber layer 2 away from the first felt layer 1, a through hole 31 coaxial with the convex cone 21 is arranged on the second rubber layer 3, a second felt layer 4 is arranged in the gap between the first rubber layer 2 and the second rubber layer 3, and a third felt layer 5 is arranged on the side of the second rubber layer 3 away from the first rubber layer 2. When in use, the side provided with the third felt layer 5 faces the noise source. When the sound enters the third felt layer 5, it is partially absorbed and weakened, and then reaches the second rubber layer 3. At the second rubber layer 3, part of the sound is reflected back to the third felt layer 5 and weakened again before returning to the environment. Part of the sound passes through the second rubber layer 3 and enters the second felt layer 4 and is weakened before reaching the first rubber layer 2. At the first rubber layer 2, part of the sound is reflected back to the second felt layer 4 and the third felt layer 5. The remaining sound passes through the first rubber layer 2 and enters the first felt layer 1 and is weakened. The noise level heard by people on the side of the chemical fiber felt far from the noise source is reduced. Part of the sound entering the through hole 31 is reflected by the convex cone 21 to the second felt layer 4 without returning from the through hole 31. Therefore, the sound reflected back to the environment is reduced and the sound absorption effect is improved. This is very useful in a noise room where people work. If the sound is not absorbed but only reflected, the noise level in the room will be superimposed and much higher. The better the sound absorption effect, the closer the noise level in the room is to the level of the generated noise itself. If there is no convex cone 21, more sound will return to the environment from the through hole 31, and the sound at the first felt layer 1 corresponding to the through hole 31 will be stronger. Due to the presence of the first rubber layer 2 and the second rubber layer 3, when the total thickness of the felt layer is the same, it is more difficult for the sound to penetrate the chemical fiber felt to reach the side of it far away from the noise source, that is, when the noise reduction effect is the same, the total thickness of the felt layer can be smaller.
[0013] Furthermore, the diameter of the bottom surface of the convex cone 21 is larger than the diameter of the through hole 31 , and the vertex of the convex cone 21 is located on the side of the through hole 31 close to the first rubber layer 2 , so that the sound entering the through hole 31 can be more reflected into the second felt layer 4 .
[0014] Furthermore, the cone angle of the convex cone 21 is equal to 90°, so that the generatrix of the convex cone 21 forms an angle of 45° with the first rubber layer 2, and the sound passing through the through hole 31 and parallel to the axis of the through hole 31 is reflected by the convex cone 21 and parallel to or nearly parallel to the first rubber layer 2, which greatly increases the absorption path. Of course, part of these sounds parallel to the first rubber layer 2 will encounter the convex cone 21 adjacent to it and then be reflected from the through hole 31 back to the environment. In this case, the absorption path of the sound is also increased to a certain extent.
[0015] Furthermore, a cone 32 coaxial with the convex cone 21 is provided on one side of the through hole 31 close to the first rubber layer 2, and the outer wall of the convex cone 21 is parallel to the inner wall of the cone 32 on the cross section passing through the axis of the convex cone 21. After the sound enters the through hole 31, it will be reflected and penetrated multiple times between the cone 32 and the convex cone 21, wherein the sound passing through the cone 32 is also nearly parallel to the first rubber layer 2, and the absorption path of the reflected sound is increased. When this part of the sound finally passes through the gap between the cone 32 and the first rubber layer 2, a part of it will also encounter the adjacent convex cone 21, and then it will be reflected and penetrated multiple times in the convex cone 21 and the cone 32 corresponding thereto, and finally enter the third felt layer 5 through the through hole 31 and enter the environment, and is greatly attenuated.
[0016] It should be understood that the above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the design concept of the present application should be included in the protection scope of the present application.
Claims
1. A sound-absorbing and noise-reducing chemical fiber felt, comprising a first felt layer (1), characterized in that: A first rubber layer (2) is provided on one side of the first felt layer (1); a plurality of convex cones (21) are provided on the side of the first rubber layer (2) away from the first felt layer (1); a second rubber layer (3) is provided on the side of the first rubber layer (2) away from the first felt layer (1) with a gap therebetween; a through hole (31) coaxial with the convex cone (21) is provided on the second rubber layer (3); a second felt layer (4) is provided in the gap between the first rubber layer (2) and the second rubber layer (3); and a third felt layer (5) is provided on the side of the second rubber layer (3) away from the first rubber layer (2).
2. The sound-absorbing and noise-reducing chemical fiber felt according to claim 1, characterized in that: The diameter of the bottom surface of the convex cone (21) is greater than the diameter of the through hole (31), and the apex of the convex cone (21) is located on a side of the through hole (31) close to the first rubber layer (2).
3. The sound-absorbing and noise-reducing chemical fiber felt according to claim 2, characterized in that: The cone angle of the convex cone (21) is equal to 90°.
4. The sound-absorbing and noise-reducing chemical fiber felt according to claim 3, characterized in that: A cone cylinder (32) coaxial with the convex cone (21) is provided on one side of the through hole (31) close to the first rubber layer (2); the outer wall of the convex cone (21) is parallel to the inner wall of the cone cylinder (32) in a cross section passing through the axis of the convex cone (21).