A silencer enclosure shell structure

Abstract

This utility model discloses a shell structure for a soundproof enclosure, comprising a rigid enclosure, an elastic buffer layer, and a damping layer. The elastic buffer layer is disposed on the outer wall of the rigid enclosure to absorb external mechanical vibrations. The damping layer is disposed on the inner wall of the rigid enclosure to provide damping, vibration reduction, and airtight sound insulation. By integrating the elastic buffer layer, rigid enclosure, and damping layer sequentially along the thickness direction, external excitation is initially attenuated by the elastic buffer layer, then its propagation path is blocked by the rigid enclosure, and finally the residual vibration is consumed by the damping layer through shear energy dissipation, while simultaneously achieving airtight sound insulation. Therefore, the enclosure structure itself possesses wideband vibration reduction capabilities, eliminating the need for additional suspension or air cushion devices to suppress the transmission of vibration to the internal test space, reduce frequency response test errors, and solve the defect of inaccurate test results caused by vibration transmission in production line environments.

Description

Technical Field

[0001] This utility model relates to the technical field of electroacoustic device testing equipment, and in particular to a shell structure for a silencer box. Background Technology

[0002] Speaker testing needs to be conducted in a quiet environment. An anechoic chamber is a sealed enclosure lined with sound-absorbing material that isolates external noise, providing a low-noise environment similar to an anechoic chamber for testing. During testing, the speaker is placed inside the chamber and a test signal is played. Measuring microphones on the chamber walls collect sound pressure and distortion data, allowing for a quick determination of whether the product is up to standard.

[0003] However, on automated production lines, the vibrations from robotic arms handling and adjacent equipment are transmitted to the silencer box through the ground or supports. The microphone then picks up the vibration noise, causing errors in frequency response and distortion measurements, and increasing the misjudgment rate. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a shell structure for a silencer box with anti-vibration interference capability.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a shell structure for a silencer box, comprising... Rigid enclosure; An elastic buffer layer is provided on the outer wall of the rigid box to absorb external mechanical vibration; A damping layer is provided on the inner wall of the rigid box to provide damping, vibration reduction, and airtight sound insulation.

[0006] Furthermore, the rigid housing is made of aluminum, galvanized steel, magnesium alloy, or carbon fiber.

[0007] Furthermore, the elastic buffer layer is made of EVA foam, polyurethane, synthetic rubber, or foamed silicone.

[0008] Furthermore, the damping layer is made of butyl rubber.

[0009] Furthermore, the thickness of the damping layer is greater than or equal to 1.5 times the thickness of the rigid box sidewall.

[0010] Furthermore, the thickness of the elastic buffer layer is greater than twice the thickness of the rigid box sidewall and less than three times the thickness of the rigid box sidewall.

[0011] Furthermore, both the elastic buffer layer and the damping layer are adhesively bonded to the rigid housing.

[0012] Furthermore, the outer wall of the rigid box is provided with a microstructured surface that contacts the elastic buffer layer; and / or, the inner wall of the rigid box is provided with a microstructured surface that contacts the damping layer.

[0013] Furthermore, the surface of the microstructure is a pit, groove, or mesh.

[0014] Furthermore, a constraint layer is provided on the side of the damping layer away from the rigid box, and the elastic modulus of the constraint layer is higher than that of the damping layer.

[0015] The beneficial effects of this utility model are as follows: The shell structure of the silencing box provided by this utility model integrates an elastic buffer layer, a rigid box, and a damping layer in sequence along the thickness direction. This allows external excitation to be initially attenuated by the elastic buffer layer, then the rigid box to block the propagation path, and finally the damping layer to consume residual vibration through shear energy dissipation, while simultaneously achieving airtight sound insulation. Therefore, the shell structure itself possesses wide-frequency vibration reduction capabilities, eliminating the need for additional suspension or air cushion devices. This suppresses the transmission of vibration to the internal test space, reduces frequency response test errors, and solves the defect of inaccurate test results caused by vibration transmission in production line environments. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the silencer box according to Embodiment 1 of this utility model; Figure 2 This is an exploded view of the shell structure of the silencer box according to Embodiment 1 of this utility model; Figure 3 This is a cross-sectional structural diagram of the shell structure of the silencer box according to Embodiment 1 of this utility model; Figure 4 This is a cross-sectional structural diagram of the shell structure of the silencer box according to Embodiment 2 of this utility model; Figure 5 This is a cross-sectional structural diagram of the shell structure of the silencer box according to Embodiment 3 of this utility model; Figure 6 for Figure 5 Detailed view of point A in the middle.

[0017] Label Explanation: 1. Rigid enclosure; 11. Front panel; 111. Fixture mounting hole; 112. Microstructure surface; 12. Rear panel; 13. Left side panel; 14. Right side panel; 15. Top panel; 16. Bottom panel; 2. Elastic buffer layer; 3. Damping layer; 4. Constraint layer; 5. Microphone. Detailed Implementation

[0018] To explain in detail the technical content, objectives, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0019] Please refer to Figure 3 A soundproof enclosure shell structure includes a rigid enclosure 1, an elastic buffer layer 2, and a damping layer 3; the elastic buffer layer 2 is disposed on the outer side wall of the rigid enclosure 1 to absorb external mechanical vibration; the damping layer 3 is disposed on the inner side wall of the rigid enclosure 1 to provide damping, vibration reduction, and airtight sound insulation.

[0020] As can be seen from the above description, the beneficial effects of this utility model are as follows: by integrating the elastic buffer layer 2, the rigid housing 1, and the damping layer 3 in sequence along the thickness direction, the external excitation is first initially attenuated by the elastic buffer layer 2, then the rigid housing 1 blocks the propagation path, and finally the damping layer 3 consumes the residual vibration by shear energy dissipation, while simultaneously achieving airtight sound insulation. Therefore, the housing structure itself possesses wide-frequency vibration reduction capabilities, eliminating the need for additional suspension or air cushion devices, thus suppressing the transmission of vibration to the internal test space, reducing frequency response test errors, and solving the defect of inaccurate test results caused by vibration transmission in a production line environment.

[0021] Furthermore, the rigid housing 1 is made of aluminum, galvanized steel, magnesium alloy, or carbon fiber.

[0022] As can be seen from the above description, rigid enclosures 1 made of aluminum, galvanized steel, magnesium alloy or carbon fiber can be made while taking into account lightness, hardness, corrosion resistance and cost. The appropriate material for rigid enclosure 1 can be quickly selected for different working conditions.

[0023] Furthermore, the elastic buffer layer 2 is made of EVA foam, polyurethane, synthetic rubber, or foamed silicone.

[0024] As described above, using EVA foam, polyurethane, synthetic rubber or foamed silicone to make an elastic buffer layer 2 can directly buffer some of the vibrations transmitted from the robotic arm or the ground, reducing the excited vibration of the rigid wall of the rigid box 1.

[0025] Furthermore, the damping layer 3 is made of butyl rubber.

[0026] As can be seen from the above description, butyl rubber is used as the damping layer 3, with one side attached to the wall and the other side facing the inside of the chamber. It not only consumes the residual vibration but also blocks air noise, serving two purposes in one and with a simple structure.

[0027] Please refer to Figure 4 Furthermore, the thickness of the damping layer 3 is greater than or equal to 1.5 times the thickness of the sidewall of the rigid box 1.

[0028] As described above, the damping layer is thicker than the rigid wall, allowing the soft rubber to fully exert its tensile and shear deformation. When the wall bends, the rubber layer first absorbs the vibration internally, preventing the vibration from directly penetrating into the shell structure.

[0029] Please refer to Figure 4Furthermore, the thickness of the elastic buffer layer 2 is greater than twice the thickness of the side wall of the rigid box 1 and less than three times the thickness of the side wall of the rigid box 1.

[0030] As can be seen from the above description, the elastic buffer layer 2 maintains two to three times the wall thickness, is soft but does not collapse, can smooth out the peaks of low-frequency impacts, and will not cause the overall shell structure to become soft due to excessive thickness.

[0031] Furthermore, the elastic buffer layer 2 and the damping layer 3 are both glued to the rigid housing 1.

[0032] As described above, the three layers are all glued together, without rivets or screws, which reduces the path of vibration transmission.

[0033] Please refer to Figure 5 and Figure 6 Furthermore, the outer side wall of the rigid box 1 is provided with a microstructured surface 112 that contacts the elastic buffer layer 2; and / or, the inner side wall of the rigid box 1 is provided with a microstructured surface 112 that contacts the damping layer 3.

[0034] As can be seen from the above description, a microstructure surface 112 is made on the rigid wall surface of the rigid box 1, the adhesive surface is no longer smooth, and after bonding, they can be stuck together like Velcro, thus achieving anti-detachment, air release and adhesive saving at the same time.

[0035] Furthermore, the microstructure surface 112 is a pit, groove, or grid.

[0036] As can be seen from the above description, the three types of microstructure surfaces, such as pits, grooves, or grids, can all be formed in one step by roll forming or molding, which is simple to process and does not require additional steps.

[0037] Please refer to Figure 5 and Figure 6 Furthermore, a constraint layer 4 is provided on the side of the damping layer 3 away from the rigid box 1, and the elastic modulus of the constraint layer 4 is higher than that of the damping layer 3.

[0038] As described above, adding a high-modulus constraint layer 4 to the damping layer 3 forces the damping layer 3 to undergo shearing rather than simple expansion and contraction during vibration, allowing the vibration energy to be converted into heat energy and dissipated more quickly, making the interior of the shell structure quieter.

[0039] Embodiment 1 of this utility model is as follows: Please refer to Figure 1A soundproof enclosure structure is provided, which has a soundproof cavity inside. The soundproof cavity is equipped with a microphone 5 for picking up the sound of a miniature loudspeaker. This enclosure structure is suitable for online speaker testing stations next to automated production lines and can cope with the continuous vibration transmitted by the robot arm and the surrounding equipment. It is also suitable for cleanrooms with limited space and inconvenient external air source or suspension device, as well as unmanned assembly environments that require lightweight and maintenance-free operation, providing stable and low-noise acoustic testing conditions for finished loudspeaker products.

[0040] For specific details, please refer to... Figure 2 and Figure 3 The anechoic chamber's shell structure includes a rigid housing 1, an elastic buffer layer 2, and a damping layer 3. The elastic buffer layer 2 is located on the outer wall of the rigid housing 1 to absorb external mechanical vibrations. The damping layer 3 is located on the inner wall of the rigid housing 1 to provide damping, vibration reduction, and airtight sound insulation. By integrating the elastic buffer layer 2, the rigid housing 1, and the damping layer 3 sequentially along the thickness direction, external excitation is initially attenuated by the elastic buffer layer 2, then its propagation path is blocked by the rigid housing 1, and finally, the residual vibration is consumed by the damping layer 3 through shear energy dissipation, while simultaneously achieving airtight sound insulation. This allows the shell structure itself to possess wideband vibration reduction capabilities, eliminating the need for additional suspension or air cushion devices, thus suppressing the transmission of vibration to the internal test space, reducing frequency response test errors, and resolving the defects of inaccurate test results caused by vibration transmission in production line environments.

[0041] Please combine Figure 1 and Figure 2 Specifically, in this embodiment, the rigid enclosure 1 is a hexahedron assembled from a front plate 11, a rear plate 12, a left side plate 13, a right side plate 14, a top plate 15, and a bottom plate 16; wherein, the outer side walls of the left side plate 13, the right side plate 14, the top plate 15, and the bottom plate 16 are respectively equipped with elastic buffer layers 2; the inner side walls of the rear plate 12, the left side plate 13, the right side plate 14, the top plate 15, and the bottom plate 16 are all equipped with damping layers 3; the front plate 11 has fixture mounting holes 111 for mounting test fixtures, the speaker to be tested is mounted on the test fixture, and the speaker is tested by a pickup 5.

[0042] Alternatively, the rigid enclosure 1 may be made of aluminum, galvanized steel, magnesium alloy or carbon fiber. It is understood that using aluminum, galvanized steel, magnesium alloy or carbon fiber to make the rigid enclosure 1 takes into account lightness, hardness, corrosion resistance and cost, and the appropriate material of the rigid enclosure 1 can be quickly selected for different working conditions.

[0043] Alternatively, the elastic buffer layer 2 can be made of EVA foam, polyurethane, synthetic rubber, or foamed silicone. It is easy to understand that using EVA foam, polyurethane, synthetic rubber, or foamed silicone to make the elastic buffer layer 2 can directly buffer some of the vibrations transmitted from the robotic arm or the ground, thereby reducing the excited vibration of the rigid wall of the rigid box 1.

[0044] Preferably, the damping layer 3 is made of butyl rubber. Using butyl rubber as the damping layer 3, with one side attached to the wall and the other side facing the inside of the chamber, it can both consume residual vibration and block air noise, serving two purposes and having a simple structure.

[0045] Please refer to Figure 4 Embodiment 2 of this utility model is a further improvement based on Embodiment 1. In Embodiment 2, the thickness of the damping layer 3 is greater than or equal to 1.5 times the thickness of the side wall of the rigid housing 1. This allows the damping layer 3 to be thicker than the rigid wall of the rigid housing 1, enabling the soft rubber to fully exert its tensile and shear deformation. When the wall bends, the rubber layer first absorbs the vibration internally, preventing the vibration from directly penetrating into the housing structure. In addition, the thickness of the elastic buffer layer 2 is greater than twice the thickness of the side wall of the rigid housing 1 but less than three times the thickness of the side wall of the rigid housing 1. Specifically, the elastic buffer layer 2 maintains two to three times the wall thickness, making it soft but not collapsible, able to smooth out the peaks of low-frequency impacts without causing the overall housing structure to become loose due to excessive thickness.

[0046] Preferably, the elastic buffer layer 2 and the damping layer 3 are both glued to the rigid housing 1. All three layers are glued together without rivets or screws, which reduces the path of vibration transmission.

[0047] Please refer to Figure 5 and Figure 6 Embodiment 3 of this utility model is a further improvement based on Embodiment 1. In Embodiment 3: the outer wall of the rigid housing 1 is provided with a microstructured surface 112 that contacts the elastic buffer layer 2; and / or, the inner wall of the rigid housing 1 is provided with a microstructured surface 112 that contacts the damping layer 3. It can be understood that by creating the microstructured surface 112 on the rigid wall surface of the rigid housing 1, the adhesive surface is no longer smooth, and after bonding, they can be stuck together like Velcro, achieving anti-detachment, air release, and adhesive saving simultaneously; optionally, the microstructured surface 112 is a pit (such as... Figure 6 As shown), grooves or grids, pits, grooves or grids, and all three types of microstructure surfaces can be formed in one step by roll forming or molding, which is simple to process and does not require additional steps.

[0048] Specifically, a constraint layer 4 is provided on the side of the damping layer 3 facing away from the rigid housing 1. The elastic modulus of the constraint layer 4 is higher than that of the damping layer 3. Adding a high-modulus constraint layer 4 to the damping layer 3 forces the damping layer 3 to undergo shearing rather than simple expansion and contraction during vibration, allowing vibrational energy to be converted into heat energy and dissipated more quickly, making the interior of the housing structure quieter. More specifically, the elastic modulus of the constraint layer 4 is at least two orders of magnitude higher than that of the damping layer 3. Thus, the elastic modulus of the constraint layer 4 is sufficient to ensure that the damping layer 3 is mainly in a shear deformation state during vibration.

[0049] In summary, the silencing enclosure structure provided by this utility model integrates an elastic buffer layer, a rigid enclosure, and a damping layer along the thickness direction in a sequential configuration. This allows external excitation to be initially attenuated by the elastic buffer layer, then its propagation path to be blocked by the rigid enclosure, and finally, residual vibration to be consumed by the damping layer through shear energy dissipation, while simultaneously achieving airtight sound insulation. As a result, the enclosure structure itself possesses wide-frequency vibration reduction capabilities, eliminating the need for additional suspension or air cushion devices to suppress the transmission of vibration to the internal test space, reduce frequency response test errors, and resolve the defects of inaccurate test results caused by vibration transmission in production line environments.

[0050] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A shell structure for a silencer enclosure, characterized in that, include Rigid enclosure; An elastic buffer layer is provided on the outer wall of the rigid box to absorb external mechanical vibration; A damping layer is provided on the inner wall of the rigid box to provide damping, vibration reduction, and airtight sound insulation.

2. The shell structure of the silencer according to claim 1, characterized in that, The rigid housing is made of aluminum, galvanized steel, magnesium alloy, or carbon fiber.

3. The shell structure of the silencer according to claim 1, characterized in that, The elastic buffer layer is made of EVA foam, polyurethane, synthetic rubber, or foamed silicone.

4. The shell structure of the silencer according to claim 1, characterized in that, The damping layer is made of butyl rubber.

5. The shell structure of the silencer according to claim 1, characterized in that, The thickness of the damping layer is greater than or equal to 1.5 times the thickness of the rigid box sidewall.

6. The shell structure of the silencer according to claim 1, characterized in that, The thickness of the elastic buffer layer is greater than twice the thickness of the rigid box sidewall and less than three times the thickness of the rigid box sidewall.

7. The shell structure of the silencer according to claim 1, characterized in that, Both the elastic buffer layer and the damping layer are glued to the rigid housing.

8. The shell structure of the silencer according to claim 1, characterized in that, The outer wall of the rigid box is provided with a microstructured surface that contacts the elastic buffer layer; and / or, the inner wall of the rigid box is provided with a microstructured surface that contacts the damping layer.

9. The shell structure of the silencer according to claim 8, characterized in that, The surface of the microstructure is a pit, groove, or grid.

10. The shell structure of the silencer according to claim 1, characterized in that, The damping layer has a constraint layer on the side opposite to the rigid box, and the elastic modulus of the constraint layer is higher than that of the damping layer.

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