CN204808875U - Flexible ultramicropore microperforated panel sound absorber - Google Patents

Abstract

The utility model relates to a flexible ultra-microporous micro-perforated plate sound-absorbing body, which includes a three-layer bonded composite structure, which are successively a diaphragm layer, an intermediate layer and a bottom layer of a back cavity; the diaphragm layer is a micro-perforated plate of flexible material, and the The thickness of the micro-perforated plate is 10-500 microns; the micro-perforated plate is provided with a plurality of circular micro-holes, the diameter of the circular micro-holes is 10-500 microns, and the distribution density is 10 ⁴ -10 ¹⁰ / square meter; The middle layer is a support plate of flexible material, and the support plate thickness is 200 microns-100 millimeters, and the support plate is provided with a plurality of adjacent vertical through holes, and the aperture of the vertical through holes is 10 Micron-10 mm, any one vertical through hole corresponds to 1-10 micro-holes; the bottom layer of the back cavity is a thin metal plate with a thickness of 10-1000 microns; the utility model has a wide sound-absorbing frequency band and is easy to deform. It can realize small and compact installation, can meet the noise reduction requirements of different shapes of equipment, and has a very wide application prospect.

Description

Flexible ultra-microporous micro-perforated plate sound absorber

technical field

The utility model relates to the technical field of micro-perforated sound-absorbing bodies, in particular to a flexible ultra-micro-porous micro-perforated sound-absorbing body structure.

Background technique

Micro-perforated plate sound absorbing body is an important sound-absorbing material. It has a simple structure and does not pollute the environment. It can be used in harsh environments such as high temperature, high humidity, dust, and high-speed airflow impact. It can be recycled and reused. The ideal green sound-absorbing material has been widely used in various fields of noise control.

An important part of the micro-perforated plate sound absorber is a micro-perforated plate, that is, a thin plate with a large number of micro-holes on the plate surface. Its sound absorption mechanism is that a large number of micropores and the cavity behind the thin plate form a resonant sound absorption structure. When sound waves pass through a thin plate with a large number of micropores, the relative movement and friction between the air molecules in the micropores and the inner wall surface of the micropores make the sound waves The energy is converted into heat and dissipated, which has the effect of sound absorption and noise reduction.

The hole diameter of the existing micro-perforated plate is generally 0.2-1.0mm. Due to the large aperture, the sound absorption bandwidth is relatively narrow, usually only 1-2 octaves, and the single-layer micro-perforated plate sound absorber has only one resonance peak, which is difficult to further improve. Moreover, most micro-perforated plates are currently made of rigid materials, which lack flexibility, are not easy to bend and deform, and are difficult to achieve small and compact installation. With the needs of practical applications, more and more occasions have begun to use light and thin micro-perforated sound absorbers, such as plastic plates, plywood, plexiglass, etc., as well as transparent materials that can be used in buildings that can daylight; The micro-perforated plates processed by these materials lack flexibility and have little deformation, so they are not suitable for noise reduction of some noise sources with special shapes such as engines.

Contents of the invention

In view of the above problems, the technical problem to be solved by the utility model is to provide a flexible ultra-micro-porous micro-perforated plate sound-absorbing body structure that can be bent and deformed and has high sound-absorbing performance.

Adopt following technical scheme for this reason:

The flexible ultra-microporous micro-perforated plate sound absorber includes a three-layer bonded composite structure, followed by a diaphragm layer, an intermediate layer and a back cavity bottom layer; the diaphragm layer is a micro-perforated plate made of flexible material, and the micro-perforated plate The thickness of the micro-perforated plate is 10-500 microns; the micro-perforated plate is provided with a plurality of circular micro-holes, the diameter of the circular micro-holes is 10-500 microns, and the distribution density is 10 ⁴ -10 ¹⁰ per square meter; The middle layer is a support plate of flexible material, the thickness of the support plate is 200 microns-100 mm, and the support plate is provided with a plurality of adjacent vertical through holes, and the diameter of the vertical through holes is 10 microns-10 mm , any one vertical through hole corresponds to 1-10 microholes; the bottom layer of the back chamber is a thin metal plate with a thickness of 10-1000 microns.

Preferably, the vertical through holes are regular hexagonal, and a plurality of adjacent vertical through holes form a honeycomb structure on the support plate.

Preferably, the material of the micro-perforated plate is polyurethane, polyimide or silica gel.

Preferably, the material of the support plate is polyurethane, polyimide or silica gel.

Preferably, the thin metal plate is an aluminum plate or a steel plate.

The beneficial effects of the utility model are as follows: 1. Due to the flexible ultra-microporous micro-perforated plate diaphragm adopted by the present invention, the micropore diameter can be as low as tens of microns, and the sound absorption frequency band is wide, which overcomes the problems of large aperture and absorption in the prior art. The shortcomings of narrow acoustic bandwidth and poor sound absorption performance, and the micro-perforated plate itself has great flexibility, can be highly adapted to the external shape of the target noise source (such as various types of engines, etc.) through large curvature deformation, and "close to the body" mode" noise reduction.

2. The present invention has a flexible middle layer with a vertical through-hole structure. On the one hand, it is used to support the flexible micro-perforated plate diaphragm, and on the other hand, it can also constrain the direction of incident sound waves to enhance sound absorption.

In summary, the utility model uses ultra-thin metal aluminum sheet as the bottom material of the back cavity, and combines it with a flexible micro-perforated plate diaphragm and a flexible middle layer to form a flexible ultra-micro-porous micro-perforated plate sound-absorbing body. The flexible ultra-microporous micro-perforated plate has a wide sound absorption frequency band, is easy to deform, can realize small and compact installation, can meet the noise reduction requirements of different shapes of equipment, and has a very wide application prospect.

Description of drawings

The specific embodiment of the present utility model will be further described below in conjunction with accompanying drawing, wherein:

Fig. 1 is a structural representation of the utility model;

Fig. 2 is the structural representation of the middle layer in the utility model embodiment 1;

Fig. 3 is a schematic diagram of the structure of the intermediate layer in Embodiment 2 of the present utility model.

Detailed ways

Example 1

Referring to Figure 1 and Figure 2, the flexible ultra-microporous micro-perforated plate sound absorber is composed of three layers of bonded composite structure, which are the diaphragm layer 1, the middle layer 2 and the back cavity bottom layer 3 in sequence.

Diaphragm layer 1 is a micro-perforated plate made of flexible materials such as polyurethane, polyimide or silica gel. The thickness of the micro-perforated plate is 10-500 microns; The pore diameter of the micropores 4 is 10-500 microns, and the distribution density is 10 ⁴ -10 ¹⁰ per square meter; the middle layer 2 is a support plate made of flexible materials such as polyurethane, polyimide or silica gel, and the thickness of the support plate is 200 Micron-100 mm, the support plate is provided with a plurality of adjacent circular vertical through-holes 5, the diameter of the vertical through-holes 5 is 10 micron-10 mm, any one vertical through-hole 5 and 1-10 micro-holes 4 corresponds to; the bottom layer 3 of the back cavity is an aluminum sheet with a thickness of 10-1000 microns.

Example 2

Referring to Figure 1 and Figure 3, the flexible ultra-microporous and micro-perforated plate sound absorber is composed of three layers of bonded composite structure, which are the diaphragm layer 1, the middle layer 2 and the back cavity bottom layer 3 in sequence.

The diaphragm layer 1 is a micro-perforated plate made of flexible materials such as polyurethane, polyimide or silica gel, the thickness of the micro-perforated plate is 10-500 microns; the micro-perforated plate is provided with a plurality of circular micro-holes 4, circular The pore diameter of the micropores 4 is 10-500 microns, and the distribution density is 10 ⁴ -10 ¹⁰ per square meter; the middle layer 2 is a support plate made of flexible materials such as polyurethane, polyimide or silica gel, and the thickness of the support plate is 200 Micron-100 mm, the support plate is provided with a plurality of adjacent vertical through holes 6, the vertical through holes 6 are regular hexagons, and a plurality of adjacent vertical through holes 6 form a honeycomb structure on the support plate, which is more circular The honeycomb structure of the through holes makes the overall middle layer lower in density and lighter in weight, and saves material cost at the same time. The diameter of the outer circle of the regular hexagon is 10 microns-10 mm, and any one vertical through hole 5 corresponds to 1-10 micro-holes 4; the bottom layer 3 of the back cavity is a thin steel plate with a thickness of 10-1000 microns.

When the above two embodiments are in use, because the micro-perforated plate is an ultra-microporous structure made of flexible material, it has the characteristics of a wide frequency band of sound absorption and can be bent and deformed. It not only has good sound absorption performance, but also can be highly adapted to the engine The external shape of the equal-surface noise source is small in size and compact in space, and has important and broader application prospects. And because of the vertical through-hole structure of the flexible middle layer, it is used to support the flexible micro-perforated plate diaphragm on the one hand, and on the other hand, it can also constrain the direction of incident sound waves to enhance sound absorption. In addition, the ultra-thin metal steel sheet is used as the bottom layer material of the back cavity, and it is bonded and compounded with the flexible micro-perforated plate diaphragm and the middle layer of the flexible through-hole structure, which further enhances the structure of the flexible ultra-micro-porous micro-perforated plate sound absorbing body The stability enables it to be installed firmly in the case of excellent sound absorption performance.

The above is only a preferred embodiment of the utility model, but the scope of protection of the utility model is not limited thereto, and any skilled person familiar with the technical field can easily think of changes within the technical scope disclosed in the utility model Or replacement, all should be covered within the scope of protection of the present utility model. Therefore, the protection scope of the utility model is as the criterion with the protection scope of the claims.

Claims (5)

1. flexible ultramicropore porous plate acoustic adsorption device, is characterized in that, comprises three layers of bonding composite structure, is followed successively by membrane layer, middle layer and back of the body chamber bottom; Described membrane layer is the microperforated panel of flexible material, and the thickness of described microperforated panel is 10-500 micron; Described microperforated panel is provided with multiple circular micropore, and the aperture of described circular micropore is 10-500 micron, and distribution density is 10 ⁴-10 ¹⁰individual/square metre; Described middle layer is the back up pad of flexible material, back up pad thickness is 200 microns-100 millimeters, described back up pad is provided with multiple adjacent vertical through hole, and the aperture of described vertical through hole is 10 microns-10 millimeters, and any 1 vertical through hole is corresponding with 1-10 micropore; Described back of the body chamber bottom is the sheet metal of thickness 10-1000 micron.

2. flexible ultramicropore porous plate acoustic adsorption device according to claim 1, it is characterized in that, described vertical through hole is regular hexagon, and multiple adjacent vertical through hole forms cellular structure in back up pad.

3. flexible ultramicropore porous plate acoustic adsorption device according to claim 1, is characterized in that, the material of described microperforated panel is polyurethane, polyimide or silica gel.

4. flexible ultramicropore porous plate acoustic adsorption device according to claim 1, is characterized in that, the material of described back up pad is polyurethane, polyimide or silica gel.

5. flexible ultramicropore porous plate acoustic adsorption device according to claim 1, is characterized in that, described sheet metal is aluminium sheet or steel plate.