A sandwich composite pressure hull opening reinforcement structure and assembly method thereof

Abstract

The present invention belongs to the technical field of processing and manufacturing of sandwich composite pressure hulls, and in particular relates to a sandwich composite pressure hull opening reinforcement structure and its assembly method. The structure comprises an internal reinforcement ring, an inner sleeve, an outer sleeve, an external threaded sleeve, and a composite insulating filling layer; the internal reinforcement ring is nested in the opening of the sandwich composite pressure hull; the inner sleeve is inserted into the internal reinforcement ring from the inside; the outer sleeve is inserted into the internal reinforcement ring from the outside; and the external threaded sleeve is inserted into the inner sleeve and the outer sleeve in sequence from the outside to the inside; the present invention and its assembly method, by arranging the internal reinforcement ring, inner and outer sleeves, and external threaded sleeves and other strength reinforcement structures at the opening of the sandwich composite pressure hull, can ensure the pre-tightening force of the reinforcement structure on the sandwich composite material, and arranging the composite insulating filling layer between the metal parts and the upper and lower surfaces of the sandwich structure can avoid the problem of electrochemical corrosion of the reinforcement structure in the marine environment.

Description

Technical Field

[0001] The present invention belongs to the technical field of processing and manufacturing sandwich composite pressure hulls, and in particular relates to a sandwich composite pressure hull opening reinforcement structure and an assembly method thereof. Background Art

[0002] Pressure hulls are key components of underwater vehicles and other equipment, providing a dry operating environment for various instruments and equipment. Lightweight, high-stiffness sandwich composite pressure hull structures are increasingly being used to reduce equipment weight and improve navigation performance.

[0003] In order to facilitate the charging and discharging operations and signal transmission of instruments and equipment inside the pressure-resistant shell, it is often necessary to open holes in the pressure-resistant shell structure. For fiber-reinforced resin composite pressure-resistant shells, the fibers in the opening area will be cut, resulting in larger stress concentration points and weak points in structural strength, affecting the safety and reliability of the structure. In order to ensure the strength and sealing performance of the opening area, it is often necessary to set up a reinforcement and sealing structure. In order to solve the problem of opening reinforcement and sealing of composite shells, there are currently related invention patents for single laminated composite shells, but the relevant patents are only applicable to laminated composite structures and do not consider the problem of electrochemical corrosion. For sandwich structures, since their core materials are relatively soft, it is impossible to apply a large clamping force by means of bolt pre-tightening, etc., which affects their sealing and reinforcement effects. Summary of the Invention

[0004] The purpose of the present invention is to provide a sandwich composite pressure hull opening reinforcement structure and an assembly method thereof based on actual needs, so as to achieve reinforcement, sealing and insulation treatment of the opening area of ​​the composite pressure hull.

[0005] To achieve the above objectives, the present invention adopts the following technical solutions.

[0006] A sandwich composite pressure hull opening reinforcement structure, comprising an internal reinforcement ring 4, an inner liner 5, an outer liner 6, an external threaded sleeve 7, and a composite insulating filling layer 10;

[0007] The built-in reinforcement ring 4 is nested in the opening of the sandwich composite pressure hull and is located in the internal filling core material layer 2 between the composite outer surface layer 1 and the composite inner surface layer 3;

[0008] The inner sleeve 5 is inserted into the built-in reinforcement ring 4 from the inside; a bottom pad 5a is provided at the bottom of the inner sleeve 5. The bottom pad 5a is annular and rests against the inner surface layer 3 of the composite material. The outward end surface of the bottom pad 5a is a curved surface with a curvature consistent with the inner surface of the inner surface layer 3 of the composite material.

[0009] The outer bushing 6 is inserted into the inner reinforcing ring 4 from the outside; a top pad 6a is provided on the top of the outer bushing 6; the top pad 6a is a circular ring structure and abuts against the composite outer layer 1, and the inward end surface of the top pad 6a is a curved surface with a curvature consistent with the outer surface of the composite outer layer 1;

[0010] The external threaded sleeve 7 is inserted into the inner bushing 5 and the outer bushing 6 in sequence from the outside to the inside, and the inner bushing 5 and the external threaded sleeve 7 are connected by threads;

[0011] A pressure ring 7a is provided on the top of the external threaded sleeve 7, and a positioning groove 6b of the same size is provided on the top of the top pad 6a, and the pressure ring 7a is embedded in the positioning groove 6b;

[0012] The composite insulating filling layer 10 is respectively arranged between: the contact surfaces of the built-in reinforcement ring 4 and the composite outer layer 1, the internal filling core material layer 2, and the composite inner surface layer 3, between the contact surfaces of the inner sleeve 5 and the composite inner surface layer 3, and between the contact surfaces of the outer sleeve 6 and the composite outer surface layer 1.

[0013] A further improvement or preferred embodiment of the aforementioned sandwich composite pressure hull opening reinforcement structure also includes a sealing assembly, which includes an O-ring 8 and a sealing gasket 9; the O-ring 8 is arranged between the top pad 6a and the pressure ring 7a, and the sealing gasket 9 is arranged between the inner sleeve 5 and the outer sleeve 6.

[0014] As a further improvement or preferred embodiment of the aforementioned sandwich composite pressure hull opening reinforcement structure, the built-in reinforcement ring 4 is a split structure, and each split structure is connected by a slot.

[0015] As a further improvement or preferred embodiment of the aforementioned sandwich composite pressure hull opening reinforcement structure, the thickness of the built-in reinforcement ring 4 is consistent with the thickness of the internal filling core material layer 2.

[0016] A further improvement or preferred embodiment of the aforementioned sandwich composite pressure hull opening reinforcement structure is that the outer diameters of the inner sleeve 5 and the outer sleeve 6 match the inner diameter of the built-in reinforcement ring 4; the outer diameters of the inner sleeve 5 and the outer sleeve 6 match the outer diameter of the external threaded sleeve 7.

[0017] A further improvement or preferred embodiment of the aforementioned sandwich composite pressure hull opening reinforcement structure is that the composite insulating filling layer 10 is made of SW220 glass fiber fabric reinforced vinyl ester resin composite material; the inner sleeve 5 and the outer sleeve 6, and the split built-in reinforcement ring 4 are made of forged steel.

[0018] As a further improvement or preferred embodiment of the aforementioned sandwich composite pressure hull opening reinforcement structure, the pressure ring 7a is annular and has a hexagonal blind hole 7c on the top for tightening.

[0019] As a further improvement or preferred embodiment of the aforementioned sandwich composite pressure hull opening reinforcement structure, an O-ring mounting groove 7b is provided on the outer end face of the pressure ring 7a, and an internal thread is provided on the inner side of the external threaded sleeve 7 for installing various sealing heads or cabin cable sealing structures.

[0020] As a further improvement or preferred embodiment of the aforementioned sandwich composite pressure hull opening reinforcement structure, the built-in reinforcement ring 4 is configured at a preset opening of the sandwich composite pressure hull by pre-embedding.

[0021] The present application also provides an assembly method for a sandwich composite pressure hull opening reinforcement structure, comprising the following steps:

[0022] S1. After the sandwich composite pressure shell is formed, holes are drilled at the designed positions. During the drilling process, the composite materials around the holes should be kept intact as much as possible.

[0023] S2. According to the size of the installation area required for the opening reinforcement structure, remove the core material in the corresponding area and trim it;

[0024] S3. After the hole is made and the core material of the reinforcement area is removed, clean the hole wall and the surfaces of the inner and outer layers. Lay a layer of SW220 glass fiber fabric along the hole wall, the inner surface of the outer layer, and the outer surface of the inner layer, extending to 1 cm outside the edge of the reinforcement area;

[0025] S4. Place an internal reinforcement ring 4 in the area between the inner and outer layers removed in step S2. During installation, ensure that the internal reinforcement ring 4 is aligned and level with the opening in the composite surface layer.

[0026] S5. After placement is completed, the composite material insulation filling layer and the reinforcement block are cured and bonded through a vacuum forming process. After the structure is completely cured, the relevant surfaces are cleaned and leveled;

[0027] S6. Evenly apply high-strength and toughness adhesive resin to the connection between the inner sleeve 5, the pressure-resistant shell, and the internal reinforcement ring 4. Install the inner sleeve 5 inside the opening and apply a certain amount of pressure. Glue injection is performed as needed to ensure that the inner sleeve 5 is well bonded to the adjacent structures.

[0028] S7. Install the outer bushing 6 using the same process as step S5. After installation, clean the end face gap and place a sealing gasket. The sealing gasket should ensure that the gap is completely filled. Glue injection is performed as needed to ensure the sealing of the structure.

[0029] S8. Install the O-ring on the outer bushing 6 and the externally threaded sleeve 7. Tighten the externally threaded sleeve 7 with a special tool to compress the O-ring, inner bushing, outer bushing, inner and outer surfaces of the pressure shell and the sealing gasket to achieve sealing of the opening and structural enhancement.

[0030] Its beneficial effects are:

[0031] The sandwich composite pressure hull opening reinforcement structure in the present invention can ensure the pre-tightening force of the reinforcement structure on the sandwich composite material by arranging strength reinforcement structures such as built-in reinforcement rings, inner and outer bushings and external threaded sleeves at the opening of the sandwich composite pressure hull, thereby reinforcing the sandwich composite material structure in the area near the opening and ensuring the structural strength of the pressure hull. In combination with the assembly method of the sandwich composite pressure hull opening reinforcement structure proposed in the present invention, a combination of processes such as glue injection, bonding, and vacuum forming are adopted during installation, and sealing components such as O-rings and sealing gaskets are applied, which can ensure the tightness of the structure under external hydrostatic pressure while ensuring the structural strength. Based on the sandwich composite pressure hull opening reinforcement structure proposed in the present invention, a composite material insulating filling layer is provided between the metal parts and the upper and lower surfaces of the sandwich structure, which can avoid the problem of electrochemical corrosion of the reinforcement structure in the marine environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the opening reinforcement structure of the sandwich composite pressure shell;

[0033] Figure 2 It is a cross-sectional view of the opening reinforcement structure of the sandwich composite pressure hull;

[0034] Figure 3 It is a schematic diagram of a split built-in reinforcement ring;

[0035] The reference numerals include:

[0036] Composite material outer layer 1, internal filling core material layer 2, composite material inner surface layer 3, built-in reinforcement ring 4, inner sleeve 5, bottom pad 5a, outer sleeve 6, top pad 6a, positioning groove 6b, external threaded sleeve 7, pressure ring 7a, O-ring installation groove 7b, O-ring 8, sealing gasket 9, composite material insulating filling layer 10, built-in reinforcement ring split 11. DETAILED DESCRIPTION

[0037] The present invention is described in detail below with reference to specific embodiments.

[0038] The present invention relates to a sandwich composite pressure hull opening reinforcement structure, which is mainly used to provide a hole structure for strengthening and protecting the composite pressure hull, pre-tighten the sandwich composite material, and reinforce the sandwich composite material structure in the area near the opening to ensure the structural strength of the pressure hull.

[0039] like Figure 1 、 Figure 2As shown, the main structure of the sandwich composite pressure hull opening reinforcement structure of the present invention includes an internal reinforcement ring 4, an inner liner 5, an outer liner 6, an external threaded sleeve 7, and a composite material insulating filling layer 10;

[0040] The built-in reinforcement ring 4 is nested in the opening of the sandwich composite pressure hull and is located in the internal filling core material layer 2 between the composite outer surface layer 1 and the composite inner surface layer 3;

[0041] The inner sleeve 5 is inserted into the built-in reinforcement ring 4 from the inside; a bottom pad 5a is provided at the bottom of the inner sleeve 5. The bottom pad 5a is annular and rests against the inner surface layer 3 of the composite material. The outward end surface of the bottom pad 5a is a curved surface with a curvature consistent with the inner surface of the inner surface layer 3 of the composite material.

[0042] The outer bushing 6 is inserted into the inner reinforcing ring 4 from the outside; a top pad 6a is provided on the top of the outer bushing 6; the top pad 6a is a circular ring structure and abuts against the composite outer layer 1, and the inward end surface of the top pad 6a is a curved surface with a curvature consistent with the outer surface of the composite outer layer 1;

[0043] The external threaded sleeve 7 is inserted into the inner bushing 5 and the outer bushing 6 in sequence from the outside to the inside, and the inner bushing 5 and the external threaded sleeve 7 are connected by threads;

[0044] A pressure ring 7a is provided on the top of the external threaded sleeve 7, and a positioning groove 6b of the same size is provided on the top of the top pad 6a, and the pressure ring 7a is embedded in the positioning groove 6b;

[0045] An O-ring mounting groove 7b is provided on the outer end surface of the pressure ring 7a, and an internal thread for mounting various sealing heads or cabin cable sealing structures is provided on the inner side of the external threaded sleeve 7.

[0046] To facilitate assembly and use, the pressure ring 7a is annular and has a hexagonal blind hole 7c on the top for tightening.

[0047] The composite insulating filling layer 10 is respectively arranged between: the contact surfaces of the built-in reinforcement ring 4 and the composite outer layer 1, the internal filling core material layer 2, and the composite inner surface layer 3, between the inner sleeve 5 and the composite inner surface layer 3, and between the outer sleeve 6 and the composite outer surface layer 1.

[0048] To ensure tight access and seamless movement between the structures, the thickness of the internal reinforcement ring 4 is consistent with the thickness of the internal filling core layer 2. At the same time, the outer diameters of the inner and outer bushings 5 ​​and 6 match the inner diameter of the internal reinforcement ring 4; and the outer diameters of the inner and outer bushings 5 ​​and 6 match the outer diameter of the external threaded sleeve 7.

[0049] Based on the aforementioned structure, by providing high-strength metal structures such as built-in reinforcement rings, inner and outer bushings, and externally threaded sleeves at the openings of the sandwich composite pressure hull, it is possible to ensure the pre-tightening force of the reinforced structure on the sandwich composite material, achieve reinforcement of the sandwich composite material structure in the area near the opening, and ensure the structural strength of the pressure hull. During installation, the structure can integrate processes such as glue injection, bonding, and vacuum forming, and apply seals such as O-rings and sealing gaskets to ensure the structural strength while ensuring the tightness of the structure under external hydrostatic pressure. A composite insulating filling layer is provided between the metal parts and the upper and lower surfaces of the sandwich structure to avoid electrochemical corrosion problems of the reinforced structure in the marine environment.

[0050] In particular, in order to achieve a better sealing effect, this embodiment also includes a sealing assembly, wherein the sealing assembly includes an O-ring 8 and a sealing gasket 9; the O-ring 8 is arranged between the top pad 6a and the pressure ring 7a, and the sealing gasket 9 is arranged between the inner sleeve 5 and the outer sleeve 6.

[0051] As a preferred embodiment:

[0052] On the basis of the aforementioned basic structure, in order to facilitate flexible assembly and use, the built-in reinforcement ring 4 in this embodiment is a split structure, and each built-in reinforcement ring split 11 is connected by a slot.

[0053] like Figure 3 As shown, the split structure is flexible in assembly and disassembly, easy to use, can meet the installation needs of more scenarios, and can be used for secondary repair and reinforcement of existing hole structures.

[0054] As a preferred embodiment:

[0055] To facilitate production and processing and reduce material costs, the composite insulating filling layer 10 in this embodiment uses SW220 glass fiber fabric reinforced vinyl ester resin composite material; the inner sleeve 5 and outer sleeve 6 and the split built-in reinforcement ring 4 are made of forged steel.

[0056] As a preferred embodiment:

[0057] In order to improve the tightness of the connection between the reinforcement structure and the shell structure and simplify the structural assembly, in this embodiment, the built-in reinforcement ring 4 is pre-embedded in the preset opening of the sandwich composite pressure shell.

[0058] The present application also provides an assembly method for a sandwich composite pressure hull opening reinforcement structure, comprising the following steps:

[0059] S1. After the sandwich composite pressure shell is formed, holes are drilled at the designed positions. During the drilling process, the composite materials around the holes should be kept intact as much as possible.

[0060] S2. According to the size of the installation area required for the opening reinforcement structure, the core material in the corresponding area is removed and trimmed;

[0061] S3. After the hole is made and the core material of the reinforcement area is removed, clean the hole wall and the surfaces of the inner and outer layers. Lay a layer of SW220 glass fiber fabric along the hole wall, the inner surface of the outer layer, and the outer surface of the inner layer, extending to 1 cm outside the edge of the reinforcement area;

[0062] S4. Place an internal reinforcement ring 4 in the area between the inner and outer layers removed in step S2. During installation, ensure that the internal reinforcement ring 4 is aligned and level with the opening in the composite surface layer.

[0063] S5. After placement is completed, the composite material insulation filling layer and the reinforcement block are cured and bonded through a vacuum forming process. After the structure is completely cured, the relevant surfaces are cleaned and leveled;

[0064] S6. Evenly apply high-strength and toughness adhesive resin to the connection between the inner sleeve 5, the pressure-resistant shell, and the internal reinforcement ring 4. Install the inner sleeve 5 inside the opening and apply a certain amount of pressure. Glue injection is performed as needed to ensure that the inner sleeve 5 is well bonded to the adjacent structures.

[0065] S7. Install the outer bushing 6 using the same process as step S5. After installation, clean the end face gap and place a sealing gasket. The sealing gasket should ensure that the gap is completely filled. Glue injection is performed as needed to ensure the sealing of the structure.

[0066] S8. Install the O-ring on the outer bushing 6 and the externally threaded sleeve 7. Tighten the externally threaded sleeve 7 with a special tool to compress the O-ring, inner bushing, outer bushing, inner and outer surfaces of the pressure shell and the sealing gasket to achieve sealing of the opening and structural enhancement.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. An underwater vehicle sandwich composite pressure hull opening reinforcement structure, characterized in that: It comprises a built-in reinforcement ring (4), an inner bushing (5), an outer bushing (6), an external threaded sleeve (7), and a composite material insulating filling layer (16); The built-in reinforcement ring (4) is nested in the opening of the sandwich composite pressure-resistant shell and is located in the internal filling core material layer (2) between the composite outer surface layer (1) and the composite inner surface layer (3); The inner sleeve (5) is inserted into the built-in reinforcement ring (4) from the inside; a bottom pad (5a) is provided at the bottom of the inner sleeve (5); the bottom pad (5a) is annular and rests against the inner surface layer (3) of the composite material; the outward end surface of the bottom pad (5a) is a curved surface with a curvature consistent with the inner surface of the inner surface layer (3) of the composite material; The outer bushing (6) is inserted into the built-in reinforcement ring (4) from the outside; a top pad (6a) is provided on the top of the outer bushing (6); the top pad (6a) is a circular ring structure and abuts against the composite material outer layer (1); the inward end surface of the top pad (6a) is a curved surface with a curvature consistent with the outer surface of the composite material outer layer (1); The external threaded sleeve (7) is sequentially inserted into the inner sleeve (5) and the outer sleeve (6) from the outside to the inside, and the inner sleeve (5) and the external threaded sleeve (7) are connected by threads; A pressure ring (7a) is provided on the top of the external threaded sleeve (7), a positioning groove (6b) of the same size is provided on the top of the top pad (6a), and the pressure ring (7a) is embedded in the positioning groove (6b); The composite insulating filling layer (16) is respectively arranged between the contact surfaces of the built-in reinforcing ring (4) and the composite outer surface layer (1), the internal filling core material layer (2), and the composite inner surface layer (3), between the contact surface of the inner liner (5) and the composite inner surface layer (3), and between the contact surface of the outer liner (6) and the composite outer surface layer (1).

2. The underwater vehicle sandwich composite pressure hull perforated reinforcement structure according to claim 1, characterized in that: It also includes a sealing assembly, which includes an O-ring (8) and a sealing gasket (9); the O-ring (8) is arranged between the top pad (6a) and the pressure ring (7a), and the sealing gasket (9) is arranged between the inner sleeve (5) and the outer sleeve (6).

3. The underwater vehicle sandwich composite pressure hull perforated reinforcement structure according to claim 1, characterized in that: The built-in reinforcement ring (4) is a split structure, and each split structure is connected through a slot.

4. The underwater vehicle sandwich composite pressure hull perforated reinforcement structure according to claim 1, characterized in that: The thickness of the built-in reinforcement ring (4) is consistent with the thickness of the internal filling core material layer (2).

5. The underwater vehicle sandwich composite pressure hull perforated reinforcement structure according to claim 1, characterized in that: The outer diameters of the inner bushing (5) and the outer bushing (6) match the inner diameter of the built-in reinforcement ring (4); and the outer diameters of the inner bushing (5) and the outer bushing (6) match the outer diameter of the external threaded sleeve (7).

6. The underwater vehicle sandwich composite pressure hull perforated reinforcement structure according to claim 1, characterized in that: The composite material insulation filling layer (16) is made of SW220 glass fiber fabric reinforced vinyl ester resin composite material; the inner lining (5), the outer lining (6) and the built-in reinforcement ring (4) are made of forged steel.

7. The underwater vehicle sandwich composite pressure hull perforated reinforcement structure according to claim 1, characterized in that: The pressure ring (7a) is in the shape of a circular ring, and a hexagonal blind hole (7c) for tightening is provided on the top.

8. The underwater vehicle sandwich composite pressure hull perforated reinforcement structure according to claim 1, characterized in that: An O-ring installation groove (7b) is provided on the outer end surface of the pressure ring (7a), and an internal thread for installing various sealing heads or cabin cable sealing structures is provided on the inner side of the external threaded sleeve (7).

9. The underwater vehicle sandwich composite pressure hull perforated reinforcement structure according to claim 1, characterized in that: The built-in reinforcement ring (4) is configured at a preset opening of the sandwich composite material pressure-resistant shell in a pre-buried manner.

10. The assembly method for the underwater vehicle sandwich composite pressure hull perforated reinforcement structure according to claim 2, characterized in that: The steps include: S1. After the sandwich composite pressure shell is formed, holes are drilled at the designed positions. During the drilling process, the composite materials around the holes should be kept intact as much as possible. S2. According to the size of the installation area required for the opening reinforcement structure, the core material in the corresponding area is removed and trimmed; S3. After the hole is made and the core material of the reinforcement area is removed, clean the hole wall and the surfaces of the inner and outer layers. Lay a layer of SW220 glass fiber fabric along the hole wall, the inner surface of the outer layer, and the outer surface of the inner layer, extending to 1 cm outside the edge of the reinforcement area; S4, placing an internal reinforcement ring (4) in the area between the inner and outer layers removed in step S2; during the installation process, the internal reinforcement ring (4) should be aligned and leveled with the opening of the composite material surface; S5. After placement is completed, the composite material insulation filling layer and the reinforcement block are cured and bonded through a vacuum forming process. After the structure is completely cured, the relevant surfaces are cleaned and leveled; S6. Apply high-strength and tough adhesive resin evenly to the connection parts between the inner sleeve (5), the pressure-resistant shell and the built-in reinforcement ring (4), install the inner sleeve (5) inside the opening, apply a certain pressure, and perform glue injection as needed to ensure that the inner sleeve (5) and the adjacent structures are well bonded; S7, using the same process as step S5, install the outer bushing (6); after installation, clean the end face gap and place the sealing gasket, which should ensure that the gap is completely filled. If necessary, perform glue injection to ensure the sealing of the structure; S8. Install an O-ring on the outer bushing (6), and install an external threaded sleeve (7). Tighten the external threaded sleeve (7) with a special tool to compress the O-ring, the inner bushing, the outer bushing, the inner and outer surfaces of the pressure shell and the sealing gasket to achieve sealing of the opening and structural enhancement.

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