An impedance-gradient composite honeycomb sandwich integrated sound absorption and insulation structure

Abstract

This utility model discloses an impedance-gradient composite honeycomb sandwich integrated sound absorption and insulation structure, including an upper surface plate, a lower surface plate, and a composite honeycomb sandwich layer located between the upper and lower surface plates. The composite honeycomb sandwich layer is composed of multiple honeycomb units of different specifications, with the pore size of the honeycomb units gradually decreasing from near the upper surface plate to near the lower surface plate. This structure achieves impedance gradation through the design of the impedance-gradient composite honeycomb sandwich layer, which can gradually adapt to impedance changes, reduce sound wave reflection loss at the interface, and allow more sound waves to enter the interior of the structure and be absorbed and consumed, significantly improving sound absorption and insulation performance. Furthermore, the different materials work together to fully utilize their respective sound absorption and insulation advantages, forming a good synergistic effect and further improving the overall noise reduction effect. At the same time, a positioning structure is designed between the upper and lower surface plates and the composite honeycomb sandwich layer to ensure the stability of the subsequent overall adhesive assembly.

Description

Technical Field

[0001] This utility model belongs to the field of sound absorption and insulation structure technology, specifically relating to an impedance-gradient composite honeycomb sandwich integrated sound absorption and insulation structure, which can be widely used in construction, transportation, industrial equipment and other fields to reduce noise pollution. Background Technology

[0002] In the field of noise control, sound-absorbing and sound-insulating structures are crucial for improving the acoustic environment. Traditional sound-absorbing and sound-insulating structures often have the problem of not being able to balance sound absorption and sound insulation performance. Some structures focus on sound absorption but have poor sound insulation and cannot effectively block the transmission of noise; while other structures have good sound insulation performance but limited sound absorption capacity and cannot fully absorb and consume sound energy.

[0003] While existing honeycomb sandwich structures possess good mechanical properties and sound absorption / insulation effects to a certain extent, their internal structure is relatively simple, and the acoustic impedance distribution is not reasonable. During sound propagation, reflection, transmission, and absorption occur when encountering material interfaces with different impedances. Traditional honeycomb sandwich structures cannot achieve a gradual change in impedance based on the sound propagation characteristics, resulting in an unoptimized propagation path for sound waves within the structure and low sound absorption / insulation efficiency. Furthermore, some structures lack innovation in material selection and combination, failing to fully utilize the sound absorption and insulation advantages of different materials, making it difficult to meet noise reduction requirements in complex noise environments. Moreover, the overall structural stability after assembly is poor. Therefore, this utility model proposes an impedance-gradient composite honeycomb sandwich integrated sound absorption and insulation structure. Utility Model Content

[0004] The purpose of this invention is to provide an impedance-gradient composite honeycomb sandwich integrated sound absorption and insulation structure. By optimizing the structural design and material combination, impedance gradation is achieved, improving sound absorption and insulation performance, and solving the problem that sound absorption and insulation effects are difficult to achieve simultaneously in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an impedance-gradient composite honeycomb sandwich integrated sound absorption and insulation structure, comprising an upper surface plate, a lower surface plate, and a composite honeycomb sandwich layer located between the upper surface plate and the lower surface plate;

[0006] The composite honeycomb sandwich layer is composed of multiple honeycomb units of different specifications, and the pore size of the honeycomb units gradually decreases from near the upper surface plate to near the lower surface plate.

[0007] The upper surface plate is made of porous sound-absorbing material;

[0008] The lower surface layer is composed of a rubber layer and a metal layer;

[0009] It also includes positioning structures.

[0010] Preferably, the multiple honeycomb units in the composite honeycomb sandwich layer are made of alternating layers of aluminum foam board and polyurethane foam board with good sound absorption properties.

[0011] Preferably, the rubber layer is bonded and fixed to the top surface of the metal layer.

[0012] Preferably, the positioning structure includes four positioning posts fixed at the four corners of the bottom surface of the upper surface plate, four positioning notches corresponding to the positioning posts at the four corners of the composite honeycomb interlayer, and positioning slots at the four corners of the top surface of the rubber layer.

[0013] Preferably, the positioning structure further includes an auxiliary limiting structure, which is disposed between the positioning post and the rubber layer.

[0014] Preferably, the auxiliary limiting structure includes an annular rubber seat fixed to the inner wall of the positioning slot. The inner wall of the annular rubber seat is provided with a plurality of integrated triangular blocks, and the bottom surface of the positioning post is provided with an annular groove corresponding to the triangular blocks.

[0015] Preferably, the cross-section of the triangular block is a right triangle with the inclined surface facing upwards.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. Impedance Gradual Optimization of Sound Absorption and Insulation: By gradually reducing the pore size of the honeycomb unit from near the top surface to near the bottom surface, impedance gradual change is achieved. This structure allows sound waves to gradually adapt to the impedance change during propagation, reducing the reflection loss of sound waves at the interface, allowing more sound waves to enter the interior of the structure and be absorbed and consumed, while enhancing the ability to block sound waves and significantly improving sound absorption and insulation performance.

[0018] 2. Synergistic effect of material combination: The composite honeycomb sandwich layer is made of alternating aluminum foam and polyurethane foam, and the upper surface layer uses porous sound-absorbing material and the lower surface layer uses rubber metal composite board. The different materials work together to give full play to their respective sound absorption and insulation advantages, forming a good synergistic effect and further improving the overall noise reduction effect.

[0019] 3. Stable structural installation: The upper and lower layers and the composite honeycomb interlayer of this structure are designed with a positioning structure to ensure the stability of the overall adhesive assembly. Attached Figure Description

[0020] Figure 1 This is an exploded view of the present invention;

[0021] Figure 2 This utility model Figure 1 A magnified view of a portion of region A in the middle;

[0022] Figure 3 This utility model Figure 1 A partial view of region B in the middle;

[0023] Figure 4 This is a cross-sectional view of the positioning slot of this utility model;

[0024] In the diagram: 1. Top surface plate; 11. Positioning pin; 111. Annular slot; 21. Rubber layer; 211. Positioning slot; 212. Annular rubber seat; 213. Triangular block; 22. Metal layer; 3. Composite honeycomb interlayer; 31. Positioning notch. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Example

[0027] Please see Figures 1 to 4 The present invention provides the following technical solution: an impedance-gradient composite honeycomb sandwich sound absorption and insulation integrated structure, including an upper surface plate 1, a lower surface plate, and a composite honeycomb sandwich 3 located between the upper surface plate 1 and the lower surface plate.

[0028] The composite honeycomb sandwich layer 3 is composed of multiple honeycomb units of different specifications. From the upper surface plate 1 to the lower surface plate, the pore size of the honeycomb units gradually decreases, forming a gradually changing impedance structure. Specifically, the honeycomb units near the upper surface plate 1 have larger pore sizes and relatively lower acoustic impedance, which is conducive to the entry and initial absorption of sound waves. As the direction moves towards the lower surface plate, the pore size of the honeycomb units gradually decreases, and the acoustic impedance gradually increases, which can better reflect and block the further propagation of sound waves, while further absorbing the remaining sound energy. In addition, the multiple honeycomb units in the composite honeycomb sandwich layer 3 are made of alternating foam aluminum boards and polyurethane foam boards with good sound absorption performance. Foam aluminum has high strength and good sound absorption characteristics, while polyurethane foam has excellent sound absorption and heat insulation performance. The alternating arrangement of the two can give full play to their respective advantages and improve the overall sound absorption and insulation effect. Both foam aluminum boards and polyurethane foam boards are cut using high-precision laser cutting machines to ensure neat cutting edges and dimensional accuracy within ±0.1mm. After cutting, the surface is cleaned to remove burrs and impurities generated during the cutting process.

[0029] The upper surface plate 1 is made of porous sound-absorbing material, such as porous ceramic plate or porous metal fiber plate. The surface of the porous sound-absorbing material has a large number of tiny pores. After the sound wave enters the pores, it rubs against the air in the pores and converts the sound energy into heat energy, thereby achieving the sound absorption effect. As the first part that the sound wave comes into contact with, the porous structure of the upper surface plate 1 can effectively increase the contact area between the sound wave and the material and improve the sound absorption efficiency.

[0030] The lower surface layer is composed of a rubber layer 21 and a metal layer 22, with the rubber layer 21 bonded to the top surface of the metal layer 22.

[0031] In this embodiment, preferably, a positioning structure is also included. The positioning structure includes four positioning posts 11 fixed at the four corners of the bottom surface of the upper surface plate 1, four positioning notches 31 corresponding to the positioning posts 11 opened at the four corners of the composite honeycomb interlayer 3, and positioning slots 211 opened at the four corners of the top surface of the rubber layer 21. When the upper surface plate 1, the composite honeycomb interlayer 3 and the lower surface plate are glued together, the bottom end of the positioning post 11 can be inserted into the positioning slot 211 through the positioning notch 31 to achieve initial positioning during the assembly of the three, avoid misalignment, and ensure the stability of the glued bonding. It can also be used to limit the mutual positioning between the upper surface plate 1, the composite honeycomb interlayer 3 and the lower surface plate after the glued bonding assembly is completed, so as to ensure the stability of the overall structure after assembly.

[0032] In this embodiment, preferably, the positioning structure further includes an auxiliary limiting structure. The auxiliary limiting structure is disposed between the positioning post 11 and the rubber layer 21. The auxiliary limiting structure includes an annular rubber seat 212 glued to the inner wall of the positioning slot 211. The inner wall of the annular rubber seat 212 is provided with a plurality of integrated triangular blocks 213. Both are made of rubber and will undergo elastic deformation when squeezed. The bottom surface of the positioning post 11 is provided with an annular groove 111 corresponding to the triangular blocks 213. When the bottom end of the positioning post 11 is subsequently inserted into the positioning slot 211, it will be inserted into the inner side of the annular rubber seat 212, and the triangular blocks 213 will be squeezed into the annular groove 111, thereby realizing the auxiliary limiting after the bottom end of the positioning post 11 is inserted into the positioning slot 211.

[0033] In this embodiment, preferably, the cross-section of the triangular locking block 213 is a right triangle with the inclined surface facing upward, so that when the bottom end of the positioning pin 11 is inserted into the inner side of the annular rubber seat 212 from top to bottom, it will first contact the inclined surface of the triangular locking block 213, making it easy for the triangular locking block 213 to undergo elastic deformation when the positioning pin 11 is inserted from top to bottom.

[0034] The assembly method for this structure is as follows:

[0035] 1. Composite honeycomb sandwich 3 assembly

[0036] Prepare a flat workbench and lay a clean plastic film on it to prevent impurities from entering the cell during assembly.

[0037] Following the order in which the pore size of the honeycomb units gradually decreases from the upper surface plate 1 to the lower surface plate, the aluminum foam board and the polyurethane foam honeycomb unit board are arranged on the worktable in sequence. During the arrangement process, ensure that the spacing between each honeycomb unit is uniform, generally 2mm.

[0038] Apply an appropriate amount of epoxy resin adhesive between adjacent honeycomb cells, ensuring even application and thorough bonding on each contact surface. After applying the adhesive, place the arranged honeycomb cells into a dedicated pressing mold, apply a pressure of 0.5 MPa, and maintain for 2 hours to allow the adhesive to fully cure, forming a robust composite honeycomb sandwich layer.

[0039] 2. The upper surface layer 1 and the composite honeycomb interlayer 3 are connected to the lower surface layer.

[0040] A layer of polyurethane adhesive with a thickness of 0.5 mm is evenly applied to the upper and lower surfaces of the composite honeycomb sandwich layer 3.

[0041] Carefully place the prepared upper and lower surface panels 1 and 3 respectively on the upper and lower surfaces of the composite honeycomb interlayer 3, which has been coated with adhesive. Insert the positioning pins 11 through the positioning notches 31 into the positioning slots 211 to achieve the combined positioning of the upper surface panel 1, the composite honeycomb interlayer 3 and the lower surface panel. Finally, place the entire structure in a constant temperature and humidity chamber and cure it for 24 hours at a temperature of 30°C and a humidity of 60% to ensure that the adhesive is completely cured. This will form a complete impedance-gradient composite honeycomb interlayer sound absorption and insulation integrated structure.

[0042] Although embodiments of the present invention have been shown and described (see the detailed description above), it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An impedance-gradient composite honeycomb sandwich integrated sound absorption and insulation structure, characterized in that: It includes an upper surface plate (1), a lower surface plate, and a composite honeycomb interlayer (3) located between the upper surface plate (1) and the lower surface plate. The composite honeycomb sandwich (3) is composed of multiple honeycomb units of different specifications. The pore size of the honeycomb units gradually decreases from near the upper surface plate (1) to near the lower surface plate. The upper surface plate (1) is made of porous sound-absorbing material; The lower surface layer is composed of a rubber layer (21) and a metal layer (22); It also includes positioning structures.

2. The impedance-gradient composite honeycomb sandwich integrated sound absorption and insulation structure according to claim 1, characterized in that: The composite honeycomb sandwich layer (3) consists of multiple honeycomb units made of alternating layers of aluminum foam and polyurethane foam, which have good sound absorption properties.

3. The impedance-gradient composite honeycomb sandwich integrated sound absorption and insulation structure according to claim 1, characterized in that: The rubber layer (21) is bonded to the top surface of the metal layer (22).

4. The impedance-gradient composite honeycomb sandwich integrated sound absorption and insulation structure according to claim 1, characterized in that: The positioning structure includes four positioning posts (11) fixed at the four corners of the bottom surface of the upper surface plate (1), four positioning notches (31) corresponding to the positioning posts (11) opened at the four corners of the composite honeycomb interlayer (3), and positioning slots (211) opened at the four corners of the top surface of the rubber layer (21).

5. The impedance-gradient composite honeycomb sandwich integrated sound absorption and insulation structure according to claim 4, characterized in that: The positioning structure also includes an auxiliary limiting structure, which is disposed between the positioning post (11) and the rubber layer (21).

6. The impedance-gradient composite honeycomb sandwich integrated sound absorption and insulation structure according to claim 5, characterized in that: The auxiliary limiting structure includes an annular rubber seat (212) fixed to the inner wall of the positioning slot (211). The inner wall of the annular rubber seat (212) is provided with a plurality of integrated triangular blocks (213). The bottom surface of the positioning post (11) is provided with an annular slot (111) corresponding to the triangular blocks (213).

7. The impedance-gradient composite honeycomb sandwich integrated sound absorption and insulation structure according to claim 6, characterized in that: The cross-section of the triangular block (213) is a right triangle with the inclined surface facing upwards.

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