Rubber product containing acoustic cavity and preparation method thereof

Abstract

The present invention provides a rubber product containing an acoustic cavity and a preparation method, comprising an acoustic rubber, wherein the acoustic rubber internally envelops an acoustic cavity and a non-metallic reinforced grid structure, wherein the non-metallic reinforced grid structure is composed of an upper honeycomb core, a middle honeycomb core, and a lower honeycomb core arranged sequentially from top to bottom, with adjacent honeycomb cores connected together by mortise and tenon joints to form a composite honeycomb three-dimensional structure, wherein the upper honeycomb core, the middle honeycomb core, and the lower honeycomb core are each composed of a plurality of honeycomb cells, wherein the acoustic cavity is disposed within the honeycomb cell, and the space between the acoustic cavity and the inner wall of the honeycomb cell is filled with acoustic rubber, and sealing rubber is provided at both the upper and lower ends of the acoustic rubber. By providing a non-metallic reinforced grid structure within the acoustic rubber to form a composite honeycomb three-dimensional structure, the present application can significantly improve the pressure resistance of the rubber product under hydrostatic pressure and reduce deformation in high-pressure environments.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration reduction and noise reduction, and in particular to a rubber product containing an acoustic cavity and a preparation method thereof. Background Art

[0002] Rubber products contain a large number of acoustic cavities inside. Through the function of acoustic cavities, rubber products can play an acoustic role in isolating and absorbing noise. However, rubber products are prone to deformation under high hydrostatic pressure, which leads to a significant reduction in the acoustic effect of rubber products. Therefore, reducing the deformation of rubber products and acoustic cavities under hydrostatic pressure is of great significance to enhancing the pressure resistance and acoustic performance of rubber products.

[0003] A Chinese patent (application number 201418009286.0) introduces a method of using a woven fabric-reinforced rubber composite structure to enhance the waterproof layer of a rubber product, thereby improving the pressure resistance of the rubber product. This patent can effectively solve the problem of depression and deformation of the waterproof layer of the rubber product, and the process is simple and easy to implement. However, this patent only enhances the waterproof layer on the surface of the rubber product, and does not enhance the acoustic cavity layer that occupies most of the volume of the rubber product. This has little benefit for the deformation of the rubber product, especially the acoustic cavity under hydrostatic pressure.

[0004] The United States Patent (publication number US4560028) discloses a pressure-resistant acoustic device that uses a honeycomb metal frame with a large number of steel brush-like structures designed in the metal frame cavity. The United States Patent (publication number US4164727) introduces an underwater acoustic pressure-resistant device that consists of three layers, a rubber layer with an air cavity in the middle, and metal plates on the upper and lower layers. The above two structures can enhance the pressure resistance of the material. However, the product uses a large amount of metal material, is heavy and rigid, has poor application technology, and is not suitable for application on model surfaces with large curvatures and models with stringent weight gain requirements. Summary of the Invention

[0005] In view of this, the present invention aims to provide a rubber product containing an acoustic cavity and a preparation method thereof to solve the problem in the prior art that rubber products containing an acoustic cavity are severely deformed under high hydrostatic pressure.

[0006] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0007] A rubber product containing an acoustic cavity comprises an acoustic rubber, wherein the acoustic rubber internally envelops the acoustic cavity and a non-metallic reinforced grid structure, wherein the non-metallic reinforced grid structure is composed of an upper honeycomb core, a middle honeycomb core, and a lower honeycomb core arranged in sequence from top to bottom, wherein adjacent honeycomb cores are connected together by mortise and tenon joints to form a composite honeycomb three-dimensional structure, wherein the upper honeycomb core, the middle honeycomb core, and the lower honeycomb core are each composed of a plurality of honeycomb cells, wherein the acoustic cavity is disposed within the honeycomb cell, and the space between the acoustic cavity and the inner wall of the honeycomb cell is filled with acoustic rubber, and sealing rubber is provided at both the upper and lower ends of the acoustic rubber.

[0008] By setting a non-metallic reinforced grid structure inside the acoustic rubber to form a composite honeycomb three-dimensional structure, the pressure resistance of the rubber product under hydrostatic pressure can be significantly improved and deformation under high-pressure environment can be reduced.

[0009] Furthermore, the acoustic cavity is configured as a trumpet-shaped acoustic cavity, a truncated cone-shaped acoustic cavity or a cylindrical acoustic cavity.

[0010] Acoustic cavities of different shapes are suitable for different application scenarios and can be selected and adjusted according to specific needs to meet the vibration and noise reduction requirements in different scenarios.

[0011] Furthermore, the maximum diameter of the acoustic cavity is Φ1, Φ1≤20 mm, the height of the acoustic cavity is h1, h1≥10 mm, and the minimum distance between adjacent acoustic cavities is d1, d1≥8 mm.

[0012] Furthermore, the minimum distance between the inner wall of the honeycomb cell and the acoustic cavity is d2, d2≥1mm, the wall thickness of the honeycomb cell is d3, 6mm≥d3≥2mm, and the height of the honeycomb cell is h2, 6mm≥h2≥2mm.

[0013] Furthermore, the material of the non-metallic reinforced grid structure is a high-strength and toughness engineering plastic with a melting point of not less than 200°C, a flexural modulus of not less than 2GPa, a compression modulus of not less than 2GPa, a shear strength of not less than 70MPa, and an impact strength of not less than 10kJ / m 2 , thermal deformation temperature is not less than 60℃, density is not more than 1.2g / cm 3 .

[0014] This setting enables high-strength and toughness engineering plastics to maintain good shape stability when subjected to external pressure, reduces the deformation of rubber products under high-pressure environments, and thus significantly improves the pressure resistance of rubber products. It ensures that the non-metallic reinforced grid structure can effectively disperse and absorb impact energy when impacted, reduces damage to the internal structure of rubber products, and improves the impact resistance of the overall structure. It enables the non-metallic reinforced grid structure to maintain good shape and performance in high-temperature environments, and achieves a lightweight design while ensuring the strength and performance of the non-metallic reinforced grid structure.

[0015] Furthermore, if the arrangement of the acoustic cavities is set to a square array, the cross-sectional shape of the honeycomb unit cell on the horizontal plane is a square; if the arrangement of the acoustic cavities is set to a triangular array, the cross-sectional shape of the honeycomb unit cell on the horizontal plane is a regular hexagon.

[0016] Different arrangements of acoustic cavities can be suitable for different application scenarios.

[0017] Furthermore, the side wall of the upper honeycomb core is provided with an upper mortise, and the upper mortise passes through the side wall of the upper honeycomb core, the upper end of the side wall of the middle honeycomb core is provided with a middle tenon rod, and the upper part of the middle tenon rod is provided with a middle connecting tenon rod, and the middle connecting tenon rod cooperates with the upper mortise to connect the upper honeycomb core and the middle honeycomb core together; the lower part of the side wall of the middle honeycomb core is provided with a middle mortise, and the upper end of the lower honeycomb core is provided with a lower tenon rod, and the upper part of the lower tenon rod is provided with a lower connecting tenon rod, and the lower connecting tenon rod cooperates with the middle mortise to connect the middle honeycomb core and the lower honeycomb core together.

[0018] The mortise and tenon connection method can significantly improve the structural stability of rubber products when subjected to high hydrostatic pressure and reduce the degradation of acoustic performance caused by deformation.

[0019] Furthermore, the upper mortise and the middle mortise are set as circular mortises, the diameters of the upper mortise and the middle mortise are Φ2, 4mm≥Φ2≥1mm, the depth of the upper mortise 51 is N1, N1=0.5h2, the depth of the middle mortise is N2, then 6mm≥N2≥2mm, the middle tenon rod, the middle connecting tenon rod, the lower tenon rod and the lower connecting tenon rod are all set as circular tenon rods, and the middle mortise is concentrically arranged with the middle tenon rod.

[0020] This setting can adjust the size of the mortise and tenon according to the needs of actual working conditions to adapt to different stress conditions and deformation requirements, and meet a wider range of application scenarios.

[0021] Furthermore, the diameter of the middle tenon rod and the lower tenon rod is Φ3, 5.8mm≥Φ3≥1.8mm, the diameter of the middle connecting tenon rod and the lower connecting tenon rod is Φ4, 4mm≥Φ4≥1mm, and the height of the middle connecting tenon rod and the lower connecting tenon rod is h3, 6mm≥h3≥2mm.

[0022] This arrangement can not only ensure a tight connection at the mortise and tenon joints, but also have excellent shear and bending resistance when subjected to external forces, thereby enhancing the stability of the entire non-metallic reinforced grid structure.

[0023] The present invention also provides a method for preparing a rubber product, which is applied to the above-mentioned rubber product containing an acoustic cavity, comprising the steps of:

[0024] S1: vulcanize and prepare sealing rubber by rubber compression molding, and proceed to step S2;

[0025] S2: According to the structures of the upper honeycomb core, the middle honeycomb core and the lower honeycomb core, corresponding molds are respectively processed, and the upper honeycomb core, the middle honeycomb core and the lower honeycomb core are respectively processed on the corresponding molds using a plastic injection molding method, and then proceeding to step S3;

[0026] S3: Installing the middle connecting tenon rod into the upper mortise to connect the upper honeycomb core and the middle honeycomb core together, installing the lower connecting tenon rod into the middle mortise to connect the middle honeycomb core and the lower honeycomb core together to form a non-metallic reinforced grid structure, and proceeding to step S4;

[0027] S4: According to the structural parameters of the acoustic cavity, a mold containing the acoustic cavity is processed by a plastic injection molding method, and then proceeds to step S5;

[0028] S5: Soaking the non-metallic reinforced grid structure in Chemlok solution for 5-10 minutes. After the soaking is completed, airing it at room temperature for 30-60 minutes, and then proceeding to step S6;

[0029] S6: placing the non-metallic reinforced grid structure into a mold containing an acoustic cavity, and proceeding to step S7;

[0030] S7: Using a rubber injection molding or injection molding method, vulcanizing and preparing an acoustic rubber, and then proceeding to step S8;

[0031] S8: Grind the joint surface of the sealing rubber and the acoustic rubber. After the grinding is completed, clean the grinding surface;

[0032] S9: Apply adhesive to the polished surface of the sealing rubber and acoustic rubber, and compact and cure.

[0033] Compared with the prior art, the rubber product containing an acoustic cavity and the preparation method of the present invention have the following advantages:

[0034] 1) It can significantly improve the pressure resistance of rubber products under high hydrostatic pressure and reduce deformation under high pressure environment;

[0035] 2) It can effectively disperse and resist external pressure, so that rubber products can still maintain good shape stability under high pressure environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the cross-sectional structure of a rubber product containing an acoustic cavity according to an embodiment of the present invention;

[0037] Figure 2 Schematic diagram of the structure of the acoustic cavity according to an embodiment of the present invention;

[0038] Figure 3 This is a schematic structural diagram of a square array of acoustic cavities according to an embodiment of the present invention;

[0039] Figure 4 This is a schematic structural diagram of the triangular array of acoustic cavities according to an embodiment of the present invention;

[0040] Figure 5 Schematic diagram of a non-metallic reinforced mesh structure of a 4×4 topology structure according to an embodiment of the present invention;

[0041] Figure 6 This is a schematic structural diagram of the upper honeycomb core according to an embodiment of the present invention;

[0042] Figure 7 This is a schematic structural diagram of the honeycomb core according to an embodiment of the present invention;

[0043] Figure 8 Schematic diagram of the structure of the lower honeycomb core according to an embodiment of the present invention.

[0044] Description of reference numerals:

[0045] 1. Sealing rubber; 2. Acoustic cavity; 3. Non-metallic reinforced grid structure; 4. Acoustic rubber; 5. Upper honeycomb core; 51. Upper mortise; 6. Middle honeycomb core; 61. Middle tenon; 611. Middle connecting tenon; 62. Middle mortise; 7. Lower honeycomb core; 71. Lower tenon; 711. Lower connecting tenon. DETAILED DESCRIPTION

[0046] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0047] Example 1

[0048] like Figure 1-8As shown, a rubber product containing an acoustic cavity includes an acoustic rubber 4, wherein the acoustic rubber 4 internally envelops an acoustic cavity 2 and a non-metallic reinforced grid structure 3. The non-metallic reinforced grid structure 3 is composed of an upper honeycomb core 5, a middle honeycomb core 6, and a lower honeycomb core 7 arranged in sequence from top to bottom. Adjacent honeycomb cores are connected together by mortise and tenon joints to form a composite honeycomb three-dimensional structure. The upper honeycomb core 5, the middle honeycomb core 6, and the lower honeycomb core 7 are each composed of a plurality of honeycomb cells. The acoustic cavity 2 is arranged in the honeycomb cell, and the acoustic rubber 4 is filled between the acoustic cavity 2 and the inner wall of the honeycomb cell. The upper and lower ends of the acoustic rubber 4 are both provided with sealing rubber 1.

[0049] By providing a non-metallic reinforced grid structure 3 inside the acoustic rubber to form a composite honeycomb three-dimensional structure, the pressure resistance of the rubber product under hydrostatic pressure can be significantly improved. The mortise and tenon design of the honeycomb core enhances the stability of the structure and reduces deformation under high-pressure environments.

[0050] Preferably, the cross-sectional shape of the honeycomb unit cell is designed according to the cross-sectional shape and cross-sectional area of ​​the acoustic cavity 2;

[0051] Preferably, the acoustic cavity 2 is arranged at the center of the honeycomb unit cell, and the two are concentrically arranged.

[0052] Preferably, the non-metallic reinforced grid structure 3 is bonded to the sealing rubber 1 .

[0053] Bonding ensures a tight bond between the non-metallic reinforced grid structure 3 and the sealing rubber 1, avoiding acoustic leakage or vibration transmission due to interface gaps, which helps maintain the acoustic performance of rubber products in complex environments and maintains their isolation and noise absorption effects. At the same time, bonding the non-metallic reinforced grid structure 3 to the sealing rubber 1 can effectively prevent moisture from penetrating into the interior of the rubber product, protecting the integrity of the acoustic cavity 2 and the internal structure.

[0054] Preferably, the sealing rubber 1 is made of a synthetic rubber with excellent water resistance and weather resistance, such as one or a combination of butyl rubber, nitrile rubber and chloroprene rubber.

[0055] Preferably, the material of the non-metallic reinforced grid structure 3 is a high-strength and toughness engineering plastic with a melting point of not less than 200°C, a flexural modulus of not less than 2GPa, a compression modulus of not less than 2GPa, a shear strength of not less than 70MPa, and an impact strength of not less than 10kJ / m 2 , thermal deformation temperature is not less than 60℃, density is not more than 1.2g / cm 3 The non-metallic reinforced grid structure 3 is preferably made of glass fiber, carbon fiber reinforced polyamide plastic, polycarbonate plastic or polyphenylene sulfide plastic.

[0056] The flexural modulus is not less than 2GPa, and the compression modulus is not less than 2GPa. This allows high-strength and toughness engineering plastics to maintain good shape stability when subjected to external pressure, reducing the deformation of rubber products under high-pressure environments, thereby significantly improving the pressure resistance of rubber products; the shear strength is not less than 70MPa, and the impact strength is not less than 10kJ / m 2 The non-metallic reinforced grid structure 3 ensures that it can effectively disperse and absorb impact energy when impacted, reducing damage to the internal structure of the rubber product and improving the impact resistance of the overall structure. The melting point is not less than 200°C and the thermal deformation temperature is not less than 60°C, so that the non-metallic reinforced grid structure 3 can still maintain good shape and performance in high temperature environments, ensuring that the rubber product can work stably under complex working conditions of high temperature and high pressure. The density is not more than 1.2g / cm 3 , so that the non-metallic reinforced grid structure 3 achieves a lightweight design while ensuring strength and performance, which helps to reduce the overall weight of rubber products and improve their use efficiency and economy.

[0057] As a preferred example of the present application, the shape of the acoustic cavity 2 is a single structure or a composite structure.

[0058] Preferably, the acoustic cavity 2 is configured as a trumpet-shaped acoustic cavity, a truncated cone-shaped acoustic cavity or a cylindrical acoustic cavity.

[0059] Acoustic cavities of different shapes are suitable for different application scenarios and can be selected and adjusted according to specific needs to meet the vibration and noise reduction requirements in different scenarios.

[0060] Preferably, when the arrangement of the acoustic cavities 2 is set to a square array, the cross-sectional shape of the honeycomb unit cell on the horizontal plane is a square; when the arrangement of the acoustic cavities 2 is set to a triangular array, the cross-sectional shape of the honeycomb unit cell on the horizontal plane is a regular hexagon.

[0061] The square array helps balance pressure in all directions and is suitable for scenarios that require evenly distributed acoustic cavities. The triangular array has better stability and can better disperse stress and reduce local deformation when under pressure, making it suitable for scenarios that require higher structural stability.

[0062] Preferably, the maximum diameter of the acoustic cavity 2 is Φ1, Φ1≤20 mm, the height of the acoustic cavity 2 is h1, h1≥10 mm, and the minimum distance between adjacent acoustic cavities 2 is d1, d1≥8 mm.

[0063] Φ1≤20mm makes the acoustic cavity 2 more compact, which helps to improve the sound reflection efficiency, thereby achieving better acoustic performance in a smaller space. It can also reduce the deformation of the acoustic cavity 2 under high pressure and enhance the overall pressure resistance of the rubber product; h1≥10mm ensures the volume of the acoustic cavity 2, which is conducive to the propagation and resonance of sound, optimizes the acoustic effect, and also increases the structural stability of the acoustic cavity and reduces the risk of collapse under high pressure; d1≥8mm can ensure that the acoustic cavities do not interfere with each other, ensuring that each cavity can play an independent acoustic role, and can also reduce the stress concentration of the rubber product when it is under stress, thereby improving the strength of the overall structure.

[0064] As a preferred example of the present application, the minimum distance between the inner wall of the honeycomb cell and the acoustic cavity 2 is d2, d2≥1mm, the wall thickness of the honeycomb cell is d3, 6mm≥d3≥2mm, and the height of the honeycomb cell is h2, 6mm≥h2≥2mm.

[0065] As a preferred example of the present application, the honeycomb unit cell combination topology structure of the non-metallic reinforced grid structure 3 matches the model curvature of the rubber product application. The topology structure design principle must first ensure that the rubber product using the non-metallic reinforced grid structure 3 has a certain degree of bendability and achieves good adhesion to the curvature model. Secondly, it must ensure the high-pressure resistance of the rubber product using the non-metallic reinforced grid structure 3 and meet the requirements of application in high water pressure environments. The 4×4 topology structure of the honeycomb unit cell combination of the non-metallic reinforced grid structure 3 is preferred.

[0066] As a preferred example of the present application, the side wall of the upper honeycomb core 5 is provided with an upper mortise 51, and the upper mortise 51 passes through the side wall of the upper honeycomb core 5. The upper end of the side wall of the middle honeycomb core 6 is provided with a middle tenon rod 61, and the upper part of the middle tenon rod 61 is provided with a middle connecting tenon rod 611. The middle connecting tenon rod 611 cooperates with the upper mortise 51 to connect the upper honeycomb core 5 and the middle honeycomb core 6 together.

[0067] It should be noted here that the side walls of the upper honeycomb core 5 are provided with multiple upper mortises 51. When the cross-sectional shape of the honeycomb cells in the upper honeycomb core 5 on the horizontal plane is a square, the four top corners of the square are provided with upper mortises 51. At the same time, the cross-sectional shape of the honeycomb cells in the middle honeycomb core 6 on the horizontal plane is also a square, and the upper ends of the four top corners of the square are provided with middle connecting tenons 611, so that the upper mortises 51 correspond one to one with the middle connecting tenons 611; the middle honeycomb core 6 and the lower honeycomb core 7 have the same structure, and the middle tenon rods 61 are integrally formed with the middle honeycomb core 6.

[0068] A middle mortise 62 is provided at the lower part of the side wall of the middle honeycomb core 6, a lower tenon rod 71 is provided at the upper end of the lower honeycomb core 7, a lower connecting tenon rod 71 is provided at the upper part of the lower tenon rod 71, and the lower connecting tenon rod 711 is cooperated with the middle mortise 62 to connect the middle honeycomb core 6 and the lower honeycomb core 7 together; when the cross-sectional shape of the honeycomb cell in the middle honeycomb core 6 on the horizontal plane is a square, the four top corners of the square are all provided with middle mortise 62, and at the same time, the cross-sectional shape of the honeycomb cell in the lower honeycomb core 7 on the horizontal plane is also a square, and the upper ends of the four top corners of the square are all provided with lower connecting tenon rods 711, so that the middle mortise 62 and the lower connecting tenon rods 711 correspond one to one; the lower tenon rod 71 is integrally formed with the lower honeycomb core 7.

[0069] The mortise and tenon connection method can significantly improve the structural stability of rubber products when subjected to high hydrostatic pressure and reduce the degradation of acoustic performance due to deformation; the mortise and tenon structure tightly connects each honeycomb core to form a frame with high overall rigidity, which not only enhances the compressive performance of rubber products, but also improves their overall anti-deformation ability. It can effectively disperse and resist external pressure, so that rubber products can still maintain good shape stability under high-pressure environments.

[0070] Preferably, the upper mortise 51 and the middle mortise 62 are configured as circular mortises, the diameters of the upper mortise 51 and the middle mortise 62 are Φ2, 4mm≥Φ2≥1mm, the depth of the upper mortise 51 is N1, N1=0.5h2, the depth of the middle mortise 62 is N2, then 6mm≥N2≥2mm, the middle tenon rod 61, the middle connecting tenon rod 611, the lower tenon rod 71 and the lower connecting tenon rod 711 are all configured as circular tenons, the middle mortise 62 is concentrically arranged with the middle tenon rod 61, the diameter of the upper mortise 51 matches the diameter of the middle connecting tenon rod 611, and the diameter of the middle mortise 62 matches the diameter of the lower connecting tenon rod 711.

[0071] This setting can adjust the size of the mortise and tenon according to the needs of actual working conditions to adapt to different stress conditions and deformation requirements, and meet a wider range of application scenarios.

[0072] Preferably, the diameter of the middle tenon rod 61 and the lower tenon rod 71 is Φ3, 5.8mm≥Φ3≥1.8mm, the diameter of the middle connecting tenon rod 611 and the lower connecting tenon rod 711 is Φ4, 4mm≥Φ4≥1mm, and the height of the middle connecting tenon rod 611 and the lower connecting tenon rod 711 is h3, 6mm≥h3≥2mm.

[0073] This arrangement can not only ensure a tight connection at the mortise and tenon joints, but also have excellent shear and bending resistance when subjected to external forces, thereby enhancing the stability of the entire non-metallic reinforced grid structure.

[0074] Preferably, the acoustic rubber 4 can be any one or more of natural rubber or synthetic rubber, preferably styrene-butadiene rubber, butyl rubber, nitrile rubber, or chlorinated butyl rubber.

[0075] The present invention also provides a method for preparing a rubber product for the above-mentioned rubber product containing an acoustic cavity, comprising the steps of:

[0076] S1: Using a rubber compression molding method, vulcanization is performed to prepare a sealing rubber 1, and then proceeding to step S2;

[0077] S2: According to the structures of the upper honeycomb core 5, the middle honeycomb core 6 and the lower honeycomb core 7, corresponding molds are respectively processed, and the upper honeycomb core 5, the middle honeycomb core 6 and the lower honeycomb core 7 are respectively processed on the corresponding molds using a plastic injection molding method, and then proceeding to step S3;

[0078] S3: Install the middle connecting tenon rod 611 into the upper mortise 51 to connect the upper honeycomb core 5 and the middle honeycomb core 6 together, and install the lower connecting tenon rod 711 into the middle mortise 62 to connect the middle honeycomb core 6 and the lower honeycomb core 7 together to form the non-metallic reinforced grid structure 3, and proceed to step S4;

[0079] S4: According to the structural parameters of the acoustic cavity 2, a plastic injection molding method is used to process a mold containing the acoustic cavity 2, and then proceed to step S5;

[0080] S5: Soak the non-metallic reinforced mesh structure 3 in the Chemlok solution for 5-10 minutes. After soaking, air it at room temperature (20°C to 25°C) for 30-60 minutes, and then proceed to step S6; the Chemlok solution can enhance the adhesion between the non-metallic reinforced mesh structure 3 and the rubber. Airing it for 30-60 minutes can fully dry the Chemlok solution.

[0081] S6: Place the non-metallic reinforced grid structure 3 into the mold containing the acoustic cavity 2 according to the designed arrangement, and proceed to step S7;

[0082] S7: Using a rubber injection molding or injection molding method, integrally vulcanizing and preparing the acoustic rubber 4, and proceeding to step S8;

[0083] S8: Grinding the interface between the sealing rubber 1 and the acoustic rubber 4. After the grinding is completed, the grinding surface is cleaned;

[0084] S9: Apply adhesive to the polished surfaces of the sealing rubber 1 and the acoustic rubber 4, and compact and cure the adhesive.

[0085] Note that in step S7, the acoustic rubber 4 prepared by integral vulcanization contains an acoustic cavity 2 and a non-metallic reinforced grid structure 3; in step S8, when the acoustic rubber 4 is polished, the acoustic cavity 2 and the non-metallic reinforced grid structure 3 contained in the acoustic rubber 4 are also polished.

[0086] The rubber product containing an acoustic cavity and the preparation method described in the present application have the following advantages: 1) By arranging a non-metallic reinforced grid structure 3 inside the acoustic rubber, the pressure resistance of the rubber product under high hydrostatic pressure can be significantly improved, and deformation under high-pressure environment can be reduced; 2) The mortise and tenon structure tightly connects each honeycomb core to form a frame with high overall rigidity, which not only enhances the compressive performance of the rubber product, but also improves its overall anti-deformation ability, can effectively disperse and resist external pressure, so that the rubber product can still maintain good shape stability under high-pressure environment.

[0087] Example 2

[0088] like Figure 1-8 As shown, the sealing rubber 1 is made of chloroprene rubber, the arrangement of the acoustic cavity 2 is set to a square array, the acoustic cavity 2 is a cylindrical acoustic cavity, the non-metallic reinforced grid structure 3 is made of 30% glass fiber reinforced polyamide plastic, and the acoustic rubber 4 is made of styrene-butadiene rubber.

[0089] The non-metallic reinforced grid structure 3 is configured as a composite honeycomb three-dimensional structure, which is composed of an upper honeycomb core 5, a middle honeycomb core 6 and a lower honeycomb core 7 arranged in sequence from top to bottom. The single-layer honeycomb core structure is connected to form a three-dimensional structure by a mortise and tenon joint.

[0090] The non-metallic reinforced grid structure 3 is set to a 4×4 topological structure, the cross-sectional shape of the honeycomb unit cell on the horizontal plane is a square, the minimum distance between the inner wall of the honeycomb unit cell and the acoustic cavity 2 is d2, d2=1mm, the wall thickness of the honeycomb unit cell is d3, d3=2mm, and the height of the honeycomb unit cell is h2, h2=2mm.

[0091] The upper mortise 51 and the middle mortise 62 are both set as round mortises with a diameter of Φ2 = 1 mm. The depth N1 of the upper mortise 51 is 1 mm, and the depth N2 of the middle mortise 62 is 2 mm. The middle connecting tenon rod 611 is set as a cylindrical shape with a height h3 = 2 mm and a diameter Φ4 = 1 mm. The middle tenon rod 61 is set as a cylindrical shape with a diameter of Φ5 = 1.8 mm. The lower connecting tenon rod 711 has the same structure as the middle connecting tenon rod 611.

[0092] According to simulation calculations, the acoustic rubber product 4 of this embodiment has a maximum deformation of 2.8 mm within a pressure range of 1.0 MPa to 3.0 MPa.

[0093] Example 3

[0094] like Figure 1-8 As shown, the sealing rubber 1 is made of butyl rubber, the arrangement of the acoustic cavity 2 is set to a triangular array, the acoustic cavity 2 is a trumpet-shaped acoustic cavity, the non-metallic reinforced grid structure 3 is made of 20% carbon fiber reinforced polyphenylene sulfide plastic, and the acoustic rubber 4 is made of nitrile rubber.

[0095] The non-metallic reinforced grid structure 3 is configured as a composite honeycomb three-dimensional structure, which is composed of an upper honeycomb core 5, a middle honeycomb core 6 and a lower honeycomb core 7 arranged in sequence from top to bottom. The single-layer honeycomb core structure is connected to form a three-dimensional structure by a mortise and tenon joint.

[0096] The non-metallic reinforced grid structure 3 is set to an 8×8 topological structure, the cross-sectional shape of the honeycomb unit cell on the horizontal plane is a regular hexagon, the minimum distance between the inner wall of the honeycomb unit cell and the acoustic cavity 2 is d2, d2=3mm, the wall thickness of the honeycomb unit cell is d3, d3=6mm, and the height of the honeycomb unit cell is h2, h2=6mm.

[0097] The upper mortise 51 and the middle mortise 62 are both set as round mortises with a diameter of Φ2 = 4 mm. The depth N1 of the upper mortise 51 is 3 mm, and the depth N2 of the middle mortise 62 is 6 mm. The middle connecting tenon rod 611 is set as a cylindrical shape with a height h3 = 6 mm and a diameter Φ4 = 4 mm. The middle tenon rod 61 is set as a cylindrical shape with a diameter of Φ5 = 5.8 mm. The lower connecting tenon rod 711 has the same structure as the middle connecting tenon rod 611.

[0098] According to simulation calculation, the acoustic rubber product 4 of this embodiment has a maximum deformation of 2 mm within a pressure range of 1.0 MPa to 3.0 MPa.

[0099] Example 4

[0100] like Figure 1-8 As shown, the sealing rubber 1 is made of nitrile rubber, the arrangement of the acoustic cavity 2 is set to a square array, the acoustic cavity 2 is a truncated cone-shaped acoustic cavity, the non-metallic reinforced grid structure 3 is made of 40% glass fiber reinforced polycarbonate plastic, and the acoustic rubber 4 is made of chlorobutyl rubber.

[0101] The non-metallic reinforced grid structure 3 is configured as a composite honeycomb three-dimensional structure, which is composed of an upper honeycomb core 5, a middle honeycomb core 6 and a lower honeycomb core 7 arranged in sequence from top to bottom. The single-layer honeycomb core structure is connected to form a three-dimensional structure by a mortise and tenon joint.

[0102] The non-metallic reinforced grid structure 3 is set to a 4×8 topological structure, the cross-sectional shape of the honeycomb unit cell on the horizontal plane is a square, the minimum distance between the inner wall of the honeycomb unit cell and the acoustic cavity 2 is d2, d2=2mm, the wall thickness of the honeycomb unit cell is d3, d3=4mm, and the height of the honeycomb unit cell is h2, h2=4mm.

[0103] The upper mortise 51 and the middle mortise 62 are both set as round mortises with a diameter of Φ2 = 2 mm. The depth N1 of the upper mortise 51 is 2 mm, and the depth N2 of the middle mortise 62 is 4 mm. The middle connecting tenon rod 611 is set as a cylindrical shape with a height h3 = 4 mm and a diameter Φ4 = 2 mm. The middle tenon rod 61 is set as a cylindrical shape with a diameter of Φ5 = 3.8 mm. The lower connecting tenon rod 711 has the same structure as the middle connecting tenon rod 611.

[0104] According to simulation calculation, the acoustic rubber product 4 of this embodiment has a maximum deformation of 2.9 mm within a pressure range of 1.0 MPa to 3.0 MPa.

[0105] The rubber product containing an acoustic cavity described in the present application can meet the design requirements of different pressure environments, and has the advantages of strong designability and light product weight. In addition, the non-metallic reinforced grid structure 3 described in the present application can be vulcanized and molded integrally with the acoustic rubber 4, and the product molding efficiency is high. At the same time, the acoustic cavity of the rubber product in the present application is not completely constrained, and the product can be bent to a certain extent to meet the construction requirements of different working conditions.

[0106] The rubber product using the present application has a maximum deformation of 3 mm under a water pressure of 3.0 MPa, while the rubber product not using the present application has a maximum deformation of 10 mm.

[0107] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the scope defined by the claims.

Claims

1. A rubber product containing an acoustic cavity, characterized in that: The invention comprises an acoustic rubber (4), wherein the acoustic rubber (4) internally envelops an acoustic cavity (2) and a non-metallic reinforced grid structure (3), wherein the non-metallic reinforced grid structure (3) is composed of an upper honeycomb core (5), a middle honeycomb core (6) and a lower honeycomb core (7) arranged in sequence from top to bottom, and adjacent honeycomb cores are connected together by mortise and tenon joints to form a composite honeycomb three-dimensional structure, wherein the upper honeycomb core (5), the middle honeycomb core (6) and the lower honeycomb core (7) are all composed of a plurality of honeycomb cells, wherein the acoustic cavity (2) is arranged in the honeycomb cell, and the acoustic rubber (4) is filled between the acoustic cavity (2) and the inner wall of the honeycomb cell, and the upper and lower ends of the acoustic rubber (4) are both provided with sealing rubber (1); the material of the non-metallic reinforced grid structure (3) is a high-strength and toughness engineering plastic with a melting point of not less than 200°C, a flexural modulus of not less than 2GPa, a compression modulus of not less than 2GPa, a shear strength of not less than 70MPa, and an impact strength of not less than 10kJ / m 2 , thermal deformation temperature is not less than 60℃, density is not more than 1.2g / cm 3 .

2. The rubber product containing an acoustic cavity according to claim 1, characterized in that: The acoustic cavity (2) is configured as a trumpet-shaped acoustic cavity, a truncated cone-shaped acoustic cavity, or a cylindrical acoustic cavity.

3. The rubber product containing an acoustic cavity according to claim 2, characterized in that: The maximum diameter of the acoustic cavity (2) is Φ1, Φ1≤20mm, the height of the acoustic cavity (2) is h1, h1≥10mm, and the minimum distance between adjacent acoustic cavities (2) is d1, d1≥8mm.

4. The rubber product containing an acoustic cavity according to claim 1, characterized in that: The minimum distance between the inner wall of the honeycomb cell and the acoustic cavity (2) is d2, d2≥1mm, the wall thickness of the honeycomb cell is d3, 6mm≥d3≥2mm, and the height of the honeycomb cell is h2, 6mm≥h2≥2mm.

5. The rubber product containing an acoustic cavity according to claim 1, characterized in that: When the arrangement of the acoustic cavities (2) is set as a square array, the cross-sectional shape of the honeycomb unit cell on the horizontal plane is a square; when the arrangement of the acoustic cavities (2) is set as a triangular array, the cross-sectional shape of the honeycomb unit cell on the horizontal plane is a regular hexagon.

6. The rubber product containing an acoustic cavity according to claim 4, characterized in that: The side wall of the upper honeycomb core (5) is provided with an upper mortise (51), and the upper mortise (51) passes through the side wall of the upper honeycomb core (5); the upper end of the side wall of the middle honeycomb core (6) is provided with a middle tenon rod 61, and the upper part of the middle tenon rod (61) is provided with a middle connecting tenon rod (611), and the middle connecting tenon rod (611) cooperates with the upper mortise (51) to connect the upper honeycomb core (5) and the middle honeycomb core (6) together; the lower part of the side wall of the middle honeycomb core (6) is provided with a middle tenon rod (62), and the upper end of the lower honeycomb core (7) is provided with a lower tenon rod (71), and the upper part of the lower tenon rod (71) is provided with a lower connecting tenon rod (711), and the lower connecting tenon rod (711) cooperates with the middle mortise (62) to connect the middle honeycomb core (6) and the lower honeycomb core (7) together.

7. The rubber product containing an acoustic cavity according to claim 6, characterized in that: The upper mortise (51) and the middle mortise (62) are configured as circular mortises, the diameters of the upper mortise (51) and the middle mortise (62) are Φ2, 4mm≥Φ2≥1mm, the depth of the upper mortise (51) is N1, N1=0.5h2, the depth of the middle mortise (62) is N2, then 6mm≥N2≥2mm, the middle tenon rod (61), the middle connecting tenon rod (611), the lower tenon rod (71) and the lower connecting tenon rod (711) are all configured as circular tenon rods, and the middle mortise (62) is concentrically configured with the middle tenon rod (61).

8. The rubber product containing an acoustic cavity according to claim 7, characterized in that: The diameters of the middle tenon rod (61) and the lower tenon rod (71) are Φ3, 5.8mm≥Φ3≥1.8mm, the diameters of the middle connecting tenon rod (611) and the lower connecting tenon rod (711) are Φ4, 4mm≥Φ4≥1mm, and the heights of the middle connecting tenon rod (611) and the lower connecting tenon rod (711) are h3, 6mm≥h3≥2mm.

9. A method for preparing a rubber product, for preparing the rubber product containing an acoustic cavity according to any one of claims 1 to 8, characterized in that: Including steps: S1: Using a rubber compression molding method, vulcanizing and preparing a sealing rubber (1), and proceeding to step S2; S2: According to the structures of the upper honeycomb core (5), the middle honeycomb core (6) and the lower honeycomb core (7), corresponding molds are respectively processed, and the upper honeycomb core (5), the middle honeycomb core (6) and the lower honeycomb core (7) are respectively processed on the corresponding molds using a plastic injection molding method, and then proceeding to step S3; S3: Installing the middle connecting tenon rod (611) into the upper mortise (51) to connect the upper honeycomb core (5) and the middle honeycomb core (6), and installing the lower connecting tenon rod (711) into the middle mortise (62) to connect the middle honeycomb core (6) and the lower honeycomb core (7) to form a non-metallic reinforced grid structure (3), and proceeding to step S4; S4: According to the structural parameters of the acoustic cavity (2), a plastic injection molding method is used to process a mold containing the acoustic cavity (2), and then proceed to step S5; S5: Soak the non-metallic reinforced grid structure (3) in the Chemlok solution for 5-10 minutes. After the soaking is completed, air it at room temperature for 30-60 minutes, and then proceed to step S6; S6: placing the non-metallic reinforced grid structure (3) into the mold containing the acoustic cavity (2), and proceeding to step S7; S7: using a rubber injection molding or injection molding method to vulcanize and prepare the acoustic rubber (4) in one piece, and then proceed to step S8; S8: Grind the bonding surface between the sealing rubber (1) and the acoustic rubber (4), and clean the polished surface after the grinding is completed; S9: Apply adhesive to the polished surfaces of the sealing rubber (1) and the acoustic rubber (4), and compact and solidify them.

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