CN217197227U

CN217197227U - High sound absorption sound insulation pad

Info

Publication number: CN217197227U
Application number: CN202220452796.4U
Authority: CN
Inventors: 田秀杰; 江育莹; 黄威; 朱可达
Original assignee: Wuxi Jixing Auto Acoustic Parts Technology Co Ltd
Current assignee: Wuxi Jixing Auto Acoustic Parts Technology Co Ltd
Priority date: 2022-03-03
Filing date: 2022-03-03
Publication date: 2022-08-16
Anticipated expiration: 2032-03-03

Abstract

The utility model discloses a high sound insulation pad that inhales, including compound top layer, intermediate level and the bottom that forms, wherein the lateral surface on top layer sets up to the plane for the reflection part sound energy is provided with the recess that the array was arranged on the medial surface with the intermediate level laminating on top layer, thereby and the intermediate level between form the air chamber that absorbs low-frequency sound, the intermediate level is used for absorbing medium-high frequency sound. Above-mentioned high sound of inhaling gives sound insulation and fills up and has mainly carried out the optimal design to the top layer that has now give sound insulation and fill up, when having guaranteed to give sound insulation and fill up the well high frequency sound absorption performance, has promoted well low frequency and has inhaled the sound performance, does not influence original structure thickness, surface density and technology, has guaranteed that give sound insulation and fill up the whole higher sound absorption level that can keep in the broad frequency channel, and the effect is obvious.

Description

High sound absorption sound insulation pad

Technical Field

The utility model relates to an automobile acoustic part technical field especially relates to a high sound of inhaling gives sound insulation and fills up.

Background

The acoustics package part is an important means of car noise control, and it gives sound insulation to enclose before containing and gives sound insulation to fill up, carpet gives sound insulation to fill up etc. have the part of inhaling sound insulation performance concurrently to and the cover gives sound insulation to fill up, preceding enclose outer sound insulation pad, wheel arc cover, end backplate etc. and use sound insulation performance to give first place to the part of giving first place to. The parts mainly for absorbing sound are mainly arranged near noise sources (engines, motors and the like), and the noise is absorbed and controlled from the source.

The sound absorbing insulation mat is generally formed by compounding a surface layer material, a porous material and a base layer material. Wherein, porous material plays the dominant role to inhaling the sound performance, and top layer, bottom layer material generally adopt ordinary non-woven fabrics, mainly play the effect of covering protection porous material and satisfying the outward appearance requirement, do not have obvious effect to holistic sound absorption performance.

Among the porous materials, glass wool is often used as an in-vehicle sound absorption material due to good sound absorption performance and price advantage, but glass wool can cause harm to respiratory systems, skin, eyes and mucous membranes of human bodies in the production process, and can cause environmental pollution due to dust in the installation and use processes, so that along with the national importance on environmental protection, the production of the glass wool is gradually controlled, and the obtaining is more and more difficult. When other porous materials are used instead, the sound absorption performance of such parts is reduced, and therefore, there is a need to find an improved solution for improving the sound absorption level of the sound insulation pad.

SUMMERY OF THE UTILITY MODEL

Based on the problem, an object of the utility model is to provide a high sound that inhales gives sound insulation and fills up optimizes current sound type that inhales and gives sound insulation and fills up the structure, promotes its sound effect of inhaling.

In order to achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides a high sound insulation pad of inhaling, is including compound top layer, intermediate level and the bottom that forms, wherein the lateral surface on top layer sets up to the plane for the reflection part acoustic energy is provided with the recess that the array was arranged on the medial surface with the intermediate level laminating on top layer, thereby and the intermediate level between form the air chamber that absorbs low and medium frequency sound, the intermediate level is used for absorbing medium and high frequency sound.

In particular, the grooves are any of polygonal, circular, elliptical, or irregular patterns.

Particularly, the groove is rhombic, the obtuse angle of the groove is 90-120 degrees, and the acute angle of the groove is 60-90 degrees.

Particularly, the surface layer adopts a single-layer fiber structure, the fiber material is any one of PP, PET, PA and PLA, the surface density range of the surface layer is 20 gsm-250 gsm, and the thickness range is 0.1 mm-1 mm.

Particularly, the middle layer adopts a porous structure and is any one of glass wool, PET (polyethylene terephthalate) cotton felt, reconstituted cotton and light PU (polyurethane) foam.

In particular, the bottom layer is made of homogeneous non-woven fabric, and the cover is attached to the middle layer.

To sum up, the beneficial effects of the utility model are that, the sound is given sound insulation to high sound absorption and fills up mainly to having carried out optimal design on the top layer of the pad that gives sound insulation now, when having guaranteed to give sound insulation to fill up the well high frequency sound absorption performance, has promoted well low frequency sound absorption performance, does not influence original structure thickness, surface density and technology, has guaranteed that the whole ability of pad that gives sound insulation keeps higher sound absorption level in the broad frequency channel, and the effect is obvious.

Drawings

Fig. 1 is a schematic structural view of a high sound absorption and insulation pad provided by an embodiment of the present invention;

fig. 2 is a schematic view of the inner side surface of the middle surface layer of the sound-absorbing and sound-insulating pad according to the embodiment of the present invention;

FIG. 3 is an enlarged view at A in FIG. 1;

fig. 4 is a graph of sound absorption curve of the performance test contrast test of the high sound absorption sound insulation pad and the existing sound insulation pad provided by the embodiment of the present invention.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar parts throughout, or parts having the same or similar functions. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly and can include, for example, fixed or removable connections, mechanical or electrical connections, direct connections, indirect connections through an intermediary, communication between two elements, or an interaction between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present invention, unless otherwise expressly specified or limited, the first feature "on" or "under" the second feature may include both the first and second features being in direct contact, and may also include the first and second features being in contact, not in direct contact, but with another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

Referring to fig. 1 to 3, the preferred embodiment provides a high sound absorption and insulation pad, which includes a surface layer 1, a middle layer 2 and a bottom layer 3.

The outer side surface of the surface layer 1 is a plane and is used for reflecting part of sound energy, and the inner side surface of the surface layer 1, which is attached to the middle layer 2, is provided with grooves 4 which are arranged in an array manner, so that an air cavity 5 for absorbing middle and low frequency sound is formed between the surface layer 1 and the middle layer 2.

The material of the surface layer 1 is preferably a metamaterial, a single-layer fiber structure is adopted, and in actual production, the material can be but not limited to PP, PET, PA, PLA and the like, the surface density of the surface layer 1 ranges from 20gsm to 250gsm, the thickness ranges from 0.1mm to 1mm, and the material is specifically selected according to actual product requirements, and the overall thickness and the surface density are not increased.

The grooves 4 are generally obtained by stamping through a die, are ensured not to penetrate through, and can be in a polygonal shape, a circular shape, an oval shape or an irregular pattern, and the like, wherein the preferred shape is a rhombus, and the obtuse angle is 90-120 degrees, and the acute angle is 60-90 degrees.

Incident sound energy reaches the metamaterial surface layer 1, part of reflected sound energy is reflected, the sound energy passing through the surface layer 1 causes the frictional heat exchange between air and materials in the air cavity 5 to consume part of the sound energy, and the rest of the sound energy continues to reach the interior of the middle layer 2.

The middle layer 2 is used for absorbing medium-high frequency sound, the middle layer 2 adopts a porous structure, and can be replaced by PET cotton felt, re-spun cotton, light PU foam and the like besides glass cotton which is conventionally used, so that reliable medium-high frequency sound absorption performance is ensured.

The residual sound energy enters the interior of the porous material through the micropores to cause the vibration of air in the pores, and the sound energy is converted into heat energy to be dissipated through the viscous resistance of the air, the friction between the air and the porous material framework, the heat conduction effect and the like, so that the purpose of sound absorption is achieved.

The bottom layer 3 is made of homogeneous non-woven fabric, covers and is attached to the middle layer 2, plays a role in covering and protecting the porous material and meeting the appearance requirement, and is good in air permeability.

Next, a performance test comparative test was performed on the above structure. The sample A adopts an improved structure, the surface layer 1 is made of PP, the grooves 4 are in a grid shape, the surface density range of the surface layer 1 is 50gsm, the thickness range is 0.5mm, the middle layer 2 is made of glass wool with high sound absorption performance commonly used for the front wall and the outer wall of the automotive interior and the cover, the thickness is 25mm, the surface density is 1000gsm, and the bottom layer 3 is made of common non-woven fabric; the surface layer and the bottom layer of the sample B are both common non-woven fabrics, and the other parameters are consistent with those of the sample A.

In fig. 4, the solid line is the sound absorption curve obtained by testing the sample a, and the dotted line is the sound absorption curve obtained by testing the sample B.

It can be found that the sound absorption coefficient of the sample A is higher than that of the sample B under the frequency of 400-5000 Hz; at 8000Hz and 5000-. Therefore, the surface structure provided by the embodiment can obviously improve the medium and low frequency sound absorption performance of the sound insulation pad.

To sum up, foretell high sound that inhales gives sound insulation and fills up has mainly carried out the optimal design to the top layer that has given sound insulation to fill up, when having guaranteed the well high frequency sound absorption performance that gives sound insulation to fill up, has promoted well low frequency sound absorption performance, does not influence original structure thickness, surface density and technology, has guaranteed that sound insulation fills up whole can keep higher sound absorption level in the broad frequency channel, and the effect is obvious.

The above embodiments have been merely illustrative of the basic principles and features of the present invention, and the present invention is not limited by the above embodiments, and does not depart from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a high sound insulation pad of inhaling, is including compound top layer, intermediate level and the bottom that forms, its characterized in that, the lateral surface on top layer sets up to the plane for the reflection part sound energy is provided with the recess that the array was arranged on the medial surface with the intermediate level laminating on top layer to and form the air chamber that absorbs low-frequency sound between the intermediate level, the intermediate level is arranged in absorbing high-frequency sound.

2. The high sound absorbing and insulating mat according to claim 1, wherein: the groove is any one of a polygon, a circle, an ellipse or an irregular figure.

3. The high sound absorbing and insulating mat according to claim 2, wherein: the groove is rhombic, the obtuse angle of the groove ranges from 90 degrees to 120 degrees, and the acute angle ranges from 60 degrees to 90 degrees.

4. The high sound absorbing and insulating mat according to claim 1, wherein: the surface layer adopts a single-layer fiber structure, the fiber material is any one of PP, PET, PA and PLA, the surface density range of the surface layer is 20 gsm-250 gsm, and the thickness range is 0.1 mm-1 mm.

5. The high sound absorbing and insulating mat according to claim 1, wherein: the middle layer adopts a porous structure and is any one of glass wool, PET (polyethylene terephthalate) cotton felt, reconstituted cotton and light PU (polyurethane) foam.

6. The high sound absorbing and insulating mat according to claim 1, wherein: the bottom layer is made of homogeneous non-woven fabric, and is covered and attached to the middle layer.