A multi-layer composite sound-absorbing board that is good for air permeability and sound insulation

Abstract

This invention discloses a multi-layer composite sound-absorbing panel that facilitates air permeability and sound insulation. It includes a sound-absorbing panel with an open structure, comprising an upper top plate, a lower bottom plate, and a side plate that closes the side ends between the upper top plate and the lower bottom plate. A cylindrical body of the same length as the sound-absorbing panel is disposed between the upper top plate and the lower bottom plate. The bottom of the cylindrical body is fixed to the lower bottom plate, and the top of the cylindrical body is open and has a sound-guiding channel fixed to the upper top plate. A spiral plate with the same cross-sectional shape as the cylindrical body is disposed inside the cylindrical body, with its starting end located at the bottom and fixed to the bottom surface of the cylindrical body. The upper top plate has upwardly distributed perforations corresponding to the sound-guiding channel, and the lower half of the cylindrical body has inwardly distributed perforations on one side of the cylindrical wall. The lower bottom plate has downwardly distributed perforations on the same side as the inwardly distributed perforations. This invention aims to provide a composite sound-absorbing panel that can combine a perforated material plate and a cavity structure to enhance noise reduction.

Description

Technical Field

[0001] The invention relates to the technical field of noise reduction, and in particular to a multi-layer composite sound-absorbing board which is beneficial to air permeability and sound insulation. Background Art

[0002] Among the existing sound-absorbing materials and sound-absorbing structures, there are porous materials, membranes, plate-like materials, or resonant structures. The membrane-like and plate-like materials are usually used in the mid-frequency band and low-frequency band, and the tuning frequency is relatively narrow. And it is often necessary to thicken the material or set a large cavity at the back, especially in the field of furniture, which occupies a large area and is not easy to handle. When the floor area is too large and the sound-absorbing board is too thick, the air permeability of the sound-absorbing board will also be weakened. Therefore, there is an urgent need for a composite sound-absorbing board that can combine a porous material board and a cavity structure and enhance the noise reduction effect. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a composite sound-absorbing panel that can combine a perforated material plate and a cavity structure and enhance the noise reduction effect.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] A multi-layer composite sound-absorbing board that is conducive to air permeability and sound insulation, comprising a sound-absorbing board with an open-hole structure, the sound-absorbing board comprising an upper top plate and a lower bottom plate, and a side plate that closes the side ends between the upper top plate and the lower bottom plate; a cylinder body of the same length as the sound-absorbing board is arranged between the upper top plate and the lower bottom plate, the bottom of the cylinder body is fixed to the lower bottom plate, the top of the cylinder body is open and is provided with a sound-conducting channel fixed to the upper top plate, a spiral plate of the same cross-sectional shape as the cylinder body is arranged in the cylinder body, the starting end of the spiral plate is located at the bottom and is fixed to the bottom surface of the cylinder body; the upper top plate is provided with upper through holes distributed along a straight line corresponding to the sound-conducting channel, the single-side cylinder wall of the lower half of the cylinder body is provided with inner through holes distributed along a straight line, and the lower bottom plate is provided with lower through holes distributed along a straight line on the same side as the inner through holes; a sound-absorbing layer is attached to a single side of the spiral plate, the inner sides of the cylinder body and the sound-conducting channel, and the inner side of the sound-absorbing board.

[0006] Furthermore, the sound absorbing plate, the cylinder, the sound guiding channel and the spiral plate are all made of polylactic acid plates, the density of the polylactic acid plates is 1250kg / m3, and the thickness of the polylactic acid plates is 4cm.

[0007] Furthermore, the cross-sections of the cylinder and the spiral plate are both hexagonal or regular polygonal structures.

[0008] Furthermore, the spiral plate has at least five spiral layers.

[0009] Furthermore, the thickness of the upper top plate and the lower top plate are both 10 mm, the diameter of the upper through holes and the lower through holes are both 8 mm, and the hole spacing is both 10 mm.

[0010] Furthermore, the inner holes have a diameter of 10 mm and a hole spacing of 15 mm.

[0011] Furthermore, the sound absorbing layer is made of porous sound absorbing material.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The present invention can be combined with an air cavity porous plate structure, and a hexagonal spiral plate is added between the upper top plate and the lower bottom plate. The composite sound-absorbing panel composed of the porous plate and the air cavity can improve the noise absorption effect, and the hexagonal spiral plate can form a coiled space. The corners of the spiral structure can improve the sound radiation impedance and have a high refractive index effect. The coiled space formed by the spiral plate in the sound-absorbing panel can also significantly reduce the thickness of the sound-absorbing panel and reduce the floor space of the sound-absorbing panel. The composite sound-absorbing panel is composed of a polylactic acid panel as a whole, and sound-absorbing cotton is attached to each structural surface, which can achieve total sound absorption in the medium and high frequency range. The polylactic acid panel is an environmentally friendly transparent material that can shield noise and clearly hear human voices. It can be used in the office area of ​​a hydropower turbine processing plant and is suitable for market demand. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention;

[0015] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0016] Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure of;

[0017] Figure 4 This is a data graph showing the sound insulation value corresponding to the absorbed sound wave frequency of the present invention.

[0018] Description of reference numerals:

[0019] 1-upper top plate, 2-lower bottom plate, 3-side plate, 4-cylinder, 5-spiral plate, 6-sound guide channel, 7-upper perforation, 8-inner perforation, 9-lower perforation. DETAILED DESCRIPTION

[0020] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0021] like Figure 1 and Figure 2As shown, a multi-layer composite sound-absorbing board that is conducive to air permeability and sound insulation includes a sound-absorbing board with an open-pore structure, wherein the sound-absorbing board includes an upper top plate 1 and a lower bottom plate 2, and a side plate 3 that closes the side ends between the upper top plate 1 and the lower bottom plate 2; a cylinder 4 that is the same length as the sound-absorbing board is arranged between the upper top plate 1 and the lower bottom plate 2, the bottom of the cylinder 4 is fixed to the lower bottom plate 2, the top of the cylinder 4 is open and is provided with a sound-conducting channel 6 that is fixed to the upper top plate 1, and a sound-conducting channel 6 that is the same shape as the cross-section of the cylinder 4 is arranged in the cylinder 4 The spiral plate 5 has a starting end located at the bottom and fixed to the bottom surface of the cylinder 4; the upper top plate 1 is provided with upper through holes 7 distributed along a straight line corresponding to the sound guide channel 6, the single-side cylinder wall of the lower half of the cylinder 4 is provided with inner through holes 8 distributed along a straight line, and the lower bottom plate 2 is provided with lower through holes 9 distributed along a straight line on the same side as the inner through holes 8; a single side of the spiral plate 5, the inner side of the cylinder 4 and the sound guide channel 6, and the inner side of the sound absorbing plate are all attached with a sound absorbing layer, and the sound absorbing layer is composed of a porous sound absorbing material.

[0022] In the present invention, the upper top plate 1, the lower bottom plate 2, the side plate 3, the cylinder 4, the sound guide channel 6 and the spiral plate 5 are all made of polylactic acid board, the density of the polylactic acid board is 1250kg / m3, the thickness of the polylactic acid board is 4cm, and the sound absorption characteristic of the polylactic acid board is that the propagation rate of sound therein is 1743m / s. Figure 4 As shown, its sound insulation coefficient is 0.82 at 2000 Hz and 0.77 at 4000 Hz, which has a good sound absorption effect. In this embodiment, the thickness of the upper top plate 1 and the lower top plate 2 are both 10 mm, the apertures of the upper perforations 7 and the lower perforations 9 are both 8 mm, and the hole spacing is 10 mm. The aperture of the inner perforations 8 is 10 mm, and the hole spacing is 15 mm, which can reduce the floor space occupied by the present invention.

[0023] The single side of the spiral plate 5, the inner side of the cylinder 4 and the sound-conducting channel 6, and the upper top plate 1, the lower bottom plate 2, and the inner side of the side plate 3 are all attached with a sound-absorbing layer, which can be composed of organic fiber materials, linen cotton felt, inorganic fiber materials, glass wool, rock wool, mineral wool or sound-absorbing cotton. In this embodiment, the sound-absorbing layer is composed of sound-absorbing cotton. Attaching porous sound-absorbing cotton to the polylactic acid board can achieve total sound absorption in the medium and high frequency range. The cross-sections of the cylinder 4 and the spiral plate 5 are both hexagonal or regular polygonal structures. The spiral plate 5 has at least five spiral layers. In this embodiment, the cross-sections of the cylinder 4 and the spiral plate 5 are both hexagonal. The hexagonal corners can improve the sound radiation impedance and have a high refractive index effect. Moreover, the spiral layer of the spiral plate 5 can coil around the air cavity to compensate for the acoustic impedance generated by the perforation, and the use of the spiral plate 5 to coil around the air cavity between the upper top plate 1, the lower bottom plate 2, and the side plate 3 can reduce the overall thickness of the composite sound-absorbing board and reduce the floor space. In order to ensure the coexistence of air permeability and sound absorption, the upper top plate 1 is provided with upper perforations 7 distributed along a straight line corresponding to the sound guiding channel 6, the single-side cylinder wall of the lower half of the cylinder body 4 is provided with inner perforations 8 distributed along a straight line, and the lower bottom plate 2 is provided with lower perforations 9 distributed along a straight line on the same side as the inner perforations 8. The perforations are staggered in position, which can be used for ventilation on the one hand, and can prevent the sound absorption effect from being weakened due to connection on the other hand.

[0024] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-layer composite sound-absorbing board that is good for air permeability and sound insulation, comprising a sound-absorbing board with an open-pore structure, characterized in that: The sound absorbing board comprises an upper top plate and a lower bottom plate, and a side plate closing the side ends between the upper top plate and the lower bottom plate; a cylinder body of the same length as the sound absorbing board is arranged between the upper top plate and the lower bottom plate, the bottom of the cylinder body is fixed to the lower bottom plate, the top of the cylinder body is open and is provided with a sound guide channel fixed to the upper top plate, a spiral plate of the same cross-sectional shape as the cylinder body is arranged in the cylinder body, the starting end of the spiral plate is located at the bottom and is fixed to the bottom surface of the cylinder body; the upper top plate is provided with upper through holes distributed along a straight line corresponding to the sound guide channel, the single-side cylinder wall of the lower half of the cylinder body is provided with inner through holes distributed along a straight line, and the lower bottom plate is provided with lower through holes distributed along a straight line on the same side as the inner through holes; a sound absorbing layer is attached to a single side of the spiral plate, the inner side of the cylinder body and the sound guide channel, and the inner side of the sound absorbing board; the cross-sections of the cylinder body and the spiral plate are both hexagonal, the spiral plate has at least five spiral layers, and the sound absorbing layer is composed of a porous sound absorbing material.

2. The multi-layer composite sound-absorbing board that is good for air permeability and sound insulation according to claim 1, characterized in that: The sound absorbing plate, cylinder, sound guiding channel and spiral plate are all made of polylactic acid board, and the density of the polylactic acid board is 1250kg / m 3 , the thickness of the polylactic acid board is 4cm.

3. The multi-layer composite sound-absorbing board that is good for air permeability and sound insulation according to claim 1, characterized in that: The thickness of the upper top plate and the lower bottom plate are both 10 mm, the diameter of the upper through holes and the lower through holes are both 8 mm, and the hole spacing is both 10 mm.

4. The multi-layer composite sound-absorbing board that is good for air permeability and sound insulation according to claim 1, characterized in that: The inner holes have a diameter of 10 mm and a hole spacing of 15 mm.

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