Sandwich composite material pressure-resistant shell trepanning reinforcing structure and assembling method thereof

Abstract

The invention belongs to the technical field of processing and manufacturing of sandwich composite material pressure-resistant shells, and particularly relates to a sandwich composite material pressure-resistant shell trepanning reinforcing structure and an assembling method thereof. Comprising a built-in reinforcing ring, an inner bushing, an outer bushing, an outer threaded sleeve and a composite material insulating filling layer, the built-in reinforcing ring is nested in the opening of the sandwich composite material pressure-resistant shell; the inner bushing is inserted into the built-in reinforcing ring from the inner side; the outer bushing is inserted into the built-in reinforcing ring from the outer side; the outer threaded sleeve is sequentially inserted into the inner bushing and the outer bushing from outside to inside; according to the invention, the built-in reinforcing ring, the inner bushing, the outer bushing, the outer threaded sleeve and other strength reinforcing structures are arranged at the opening of the sandwich composite material pressure-resistant shell, so that the pre-tightening force of the reinforcing structures on the sandwich composite material can be ensured, and the composite material insulating filling layers are arranged between the metal piece and the upper and lower surface layers of the sandwich structure; and the problem of electrochemical corrosion of the reinforcing structure in a marine environment can be avoided.

Description

Technical Field

[0001] The 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] The pressure hull is one of the key core components of underwater vehicles and other equipment, which can provide a dry working environment for various instruments and equipment. In order to reduce the weight of the equipment and improve its navigation performance, the lightweight and high-rigidity sandwich composite pressure hull structure has been increasingly used.

[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 response to 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, due to their soft core material, it is impossible to apply a large clamping force by 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 purpose, the present invention adopts the following technical solution.

[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 material 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 reinforcing 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 abuts against the inner surface layer 3 of the composite material, and 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 sleeve 5 and the outer sleeve 6 in sequence from the outside to the inside, and the inner sleeve 5 is connected to the external threaded sleeve 7 by threads;

[0011] A pressure ring 7a is provided at the top of the external threaded sleeve 7, and a positioning groove 6b of the same size is provided at 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 inner liner 5 and the composite inner surface layer 3, and between the outer liner 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, the composite insulating filling layer 10 is made of SW220 glass fiber fabric reinforced vinyl ester resin composite material; the inner liner 5 and the outer liner 6, and the split built-in reinforcement ring 4 are made of forged steel.

[0018] A further improvement or preferred embodiment of the aforementioned sandwich composite pressure hull opening reinforcement structure is that the pressure ring 7a is in a circular ring shape and is provided with 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 for mounting various sealing heads or cabin cable sealing structures is provided on the inner side of the external threaded sleeve 7.

[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, a hole is opened at the designed position. During the hole opening process, the composite material around the hole should be kept intact as much as possible;

[0023] 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;

[0024] S3. After the hole is made and the core material of the reinforced area is removed, clean the hole wall and the surface of the inner and outer layers, and 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, and extend it to 1 cm outside the edge of the reinforced area;

[0025] S4, placing an internal reinforcement ring 4 in the area between the inner and outer layers dug out in step S2; during the installation process, the internal reinforcement ring 4 should be aligned and leveled with the opening of the composite surface;

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

[0027] S6. Apply high-strength and tough adhesive resin evenly to the connection 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 appropriate to ensure that the inner sleeve 5 is well bonded to the adjacent structure;

[0028] 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, the sealing gasket should be guaranteed to completely fill the gap, and glue injection treatment is performed as needed to ensure the sealing of the structure;

[0029] S8. Install the O-ring on the outer bushing 6, and install the 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.

[0030] Its beneficial effects are:

[0031] The sandwich composite pressure hull opening reinforcement structure of 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 achieving reinforcement of 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, during installation, a combination of processes such as glue injection, bonding, and vacuum forming are adopted, and sealing parts such as O-rings and sealing gaskets are used, 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 arranged between the metal parts and the upper and lower surfaces of the sandwich structure, which can avoid the problem of electrochemical corrosion of the reinforced 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 hull;

[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 bushing 5, bottom pad 5a, outer bushing 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, and built-in reinforcement ring split 11. DETAILED DESCRIPTION

[0037] The present invention is described in detail below in conjunction with 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 vicinity of the opening to ensure the structural strength of the pressure hull.

[0039] like Figure 1 , Figure 2As shown, the sandwich composite pressure hull opening reinforcement structure of the present invention mainly comprises 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 reinforcing 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 abuts against the inner surface layer 3 of the composite material, and 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 sleeve 5 and the outer sleeve 6 in sequence from the outside to the inside, and the inner sleeve 5 is connected to the external threaded sleeve 7 by threads;

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

[0045] An O-ring installation groove 7b is arranged 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 arranged on the inner side of the external threaded sleeve 7.

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

[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 liner 5 and the composite inner surface layer 3, and between the outer liner 6 and the composite outer surface layer 1.

[0048] To ensure that the structures can be tightly inserted and removed without gaps, the thickness of the internal reinforcement ring 4 is consistent with the thickness of the internal filling core material layer 2. At the same time, the outer diameters of the inner liner 5 and the outer liner 6 match the inner diameter of the internal reinforcement ring 4; and the outer diameters of the inner liner 5 and the outer liner 6 match the outer diameter of the external threaded sleeve 7.

[0049] Based on the above structure, by setting high-strength metal structures such as built-in reinforcement rings, inner and outer bushings and external threaded sleeves at the openings of the sandwich composite pressure hull, the pre-tightening force of the reinforced structure on the sandwich composite material can be ensured, and the sandwich composite material structure in the area near the opening can be reinforced to ensure the structural strength of the pressure hull. Its structure can be installed by integrating processes such as glue injection, bonding, and vacuum forming, and using seals such as O-rings and sealing gaskets to ensure the tightness of the structure under external hydrostatic pressure while ensuring the strength of the structure. A composite material insulation filling layer is set between the metal parts and the upper and lower surfaces of the sandwich structure to avoid electrochemical corrosion problems in the reinforced structure in the marine environment.

[0050] In particular, in order to achieve a better sealing effect, the present 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] In order to facilitate production and processing and reduce material costs, the composite insulating filling layer 10 in this embodiment adopts SW220 glass fiber fabric reinforced vinyl ester resin composite material; the inner bushing 5 and the outer bushing 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 advance and arranged at the preset opening of the sandwich composite pressure hull.

[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, a hole is opened at the designed position. During the hole opening process, the composite material around the hole 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 reinforced area is removed, clean the hole wall and the surface of the inner and outer layers, and 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, and extend it to 1 cm outside the edge of the reinforced area;

[0062] S4, placing an internal reinforcement ring 4 in the area between the inner and outer layers dug out in step S2; during the installation process, the internal reinforcement ring 4 should be aligned and leveled with the opening of the composite surface;

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

[0064] S6. Apply high-strength and tough adhesive resin evenly to the connection 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 appropriate to ensure that the inner sleeve 5 is well bonded to the adjacent structure;

[0065] 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, the sealing gasket should be guaranteed to completely fill the gap, and glue injection treatment is performed as needed to ensure the sealing of the structure;

[0066] S8. Install the O-ring on the outer bushing 6, and install the 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.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution 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 solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution 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 embedded 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); The inner liner (5) is inserted into the built-in reinforcing ring (4) from the inside; a bottom pad (5a) is provided at the bottom of the inner liner (5); the bottom pad (5a) is annular and abuts 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 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 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 inserted into the inner sleeve (5) and the outer sleeve (6) in sequence 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 at the top of the external threaded sleeve (7), a positioning groove (6b) of the same size is provided at the top of the top pad (6a), and the pressure ring (7a) is embedded in the positioning groove (6b); The composite material insulating filling layer (16) is respectively arranged between the contact surfaces of the built-in reinforcement ring (4) and the composite material outer layer (1), the internal filling core material layer (2), and the composite material inner surface layer (3), between the contact surface of the inner liner (5) and the composite material inner surface layer (3), and between the contact surface of the outer liner (6) and the composite material outer 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 component, 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 reinforcing 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 bushing (5), the outer bushing (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 arranged 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 arranged on the inner side of the external thread 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 arranged at a preset opening of the sandwich composite material pressure-resistant shell in a pre-embedded 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, a hole is opened at the designed position. During the hole opening process, the composite material around the hole 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 reinforced area is removed, clean the hole wall and the surface of the inner and outer layers, and 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, and extend it to 1 cm outside the edge of the reinforced 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, the composite material insulation filling layer and the reinforcement block are cured and bonded by a vacuum forming process. After the structure is completely cured, the relevant surface is cleaned and leveled; S6. Evenly apply high-strength and tough adhesive resin 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) on the inner side of the opening, apply a certain pressure, and perform glue injection treatment as appropriate to ensure that the inner sleeve (5) and the adjacent structure are well bonded; S7, using the same process as step S5, installing the outer bushing (6); after installation, clean the end face gap and place a sealing gasket, the sealing gasket should be guaranteed to completely fill the gap, and glue injection treatment is performed as needed to ensure the sealing of the structure; S8. Install an O-ring on the outer bushing (6), and install an external threaded sleeve (7). Use a special tool to tighten the external threaded sleeve (7) 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 reinforcement.

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