A hole reinforcement structure and reinforcement method for cylindrical composite pressure hull

Abstract

The present invention discloses an opening reinforcement structure and a reinforcement method for a cylindrical composite pressure-resistant shell, which are applied in the technical field of opening reinforcement structures for pressure-resistant shells. The key points of the technical solution are: comprising a pressure-resistant shell and a through hole opened on the pressure-resistant shell; further comprising a flexible sealing ring with a U-shaped cross-section for covering and fitting the inner wall and upper and lower surfaces of the through hole, and an internal sealing reinforcement component and an external sealing reinforcement component for respectively sealing and reinforcing the inner surface and outer surface of the pressure-resistant shell, wherein the internal sealing reinforcement component and the external sealing reinforcement component are connected based on a magnetic connection component, and a covering waterproofing component for covering the external sealing reinforcement component and isolating from seawater is adhered and fixedly connected to the outside of the pressure-resistant shell; the technical effect is: good reinforcement effect under high pressure and vibration environment.

Description

Technical Field

[0001] The invention relates to the technical field of opening reinforcement structures for pressure hulls, and in particular to an opening reinforcement structure and a reinforcement method for a cylindrical composite pressure hull. Background Art

[0002] In order to meet the requirements of many different tasks such as marine environmental monitoring, resource exploration, and military security, deep diving and lightweight are becoming important development directions for underwater vehicles (AUVs). The pressure hull is the core component of the underwater vehicle and must have sufficient strength and stability to protect its internal instruments, equipment, electronic components, etc., and prevent them from being damaged by seawater pressure. In addition, under deep diving conditions, the pressure hull must also meet the requirements of lightweight, thereby increasing the effective load of the underwater vehicle. Compared with traditional metal materials such as high-strength steel, aluminum alloy, and titanium alloy, fiber resin-based composite materials have low density, light weight, and high strength. Under the conditions of meeting the requirements of structural strength and stability, the fiber resin-based composite pressure hull can reduce the weight by 40% to 50% compared with the metal material pressure hull, which can greatly increase the effective load of the underwater vehicle. In addition, the fiber composite pressure hull also has good corrosion resistance, fatigue resistance, vibration reduction and noise reduction characteristics, and is particularly suitable for the large load design requirements of deep-diving underwater vehicles.

[0003] At present, the Chinese invention with the announcement number CN112896413B discloses a reinforcement structure and sealing method for a perforated cylindrical composite pressure-resistant shell, including a casing, a spherical head and a reinforcement structure. The composite shell and the reinforcement structure are bonded together by gluing. A groove is provided on the arc surface of the reinforcement structure, and a glue injection port is provided on the casing, so that the adhesive can fully contact the bonding surface;

[0004] The existing invention achieves reinforcement of the shell by fixing the reinforcing structure and the casing together with screws to enhance the bearing capacity of the shell structure at the opening. However, since the pressure shell needs to withstand extremely high water pressure on the outside after entering deep water, the inside of the pressure shell must also be pressurized to ensure that the pressure shell has a large bearing capacity. Therefore, the pressure inside and outside the pressure shell will exert a large pressure on the reinforcing structure and the casing, causing micro-misalignment of the threads. Combined with the influence of factors such as vibration transmitted to the pressure shell by the internal equipment of the pressure shell, the use of threaded connection will inevitably cause looseness, which will affect the reinforcement effect under high pressure and vibration environment, and affect the safety performance of the pressure shell in deep water, which is necessary for improvement. Summary of the invention

[0005] The first object of the present invention is to provide an opening reinforcement structure for a cylindrical composite pressure-resistant shell, which has the advantage of good reinforcement effect under high pressure and vibration environment.

[0006] The above technical purpose of the present invention is achieved through the following technical solutions: an open hole reinforcement structure for a cylindrical composite pressure-resistant shell, comprising a pressure-resistant shell and a through hole opened on the pressure-resistant shell; also comprising a flexible sealing ring with a U-shaped cross-section for covering and fitting the inner wall and upper and lower surfaces of the through hole, and an internal sealing reinforcement component and an external sealing reinforcement component for respectively sealing and reinforcing the inner surface and outer surface of the pressure-resistant shell, wherein the internal sealing reinforcement component and the external sealing reinforcement component are connected based on a magnetic connection component, and a covering waterproofing component for covering the external sealing reinforcement component and isolating from seawater is adhered and fixedly connected to the outside of the pressure-resistant shell.

[0007] The present invention is further configured as follows: the flexible sealing ring includes an inner wall fitting portion for fitting the inner wall of the through hole and a surface fitting portion symmetrically arranged at both ends of the inner wall fitting portion for fitting the inner surface and the outer surface of the pressure-resistant shell, and the surface fitting portion is fixedly connected with an arc-shaped or stepped structure at one end away from the inner wall fitting portion, which is used for extending when the surface fitting portion is compressed and deformed, thereby fitting the inner and outer surfaces of the pressure-resistant shell and the extended fitting portions of the internal sealing reinforcement component and the external sealing reinforcement component.

[0008] The present invention is further configured as follows: the internal sealing reinforcement component and the external sealing reinforcement component have the same structure, both including a cylindrical connecting portion coaxially arranged in the flexible sealing ring and a prismatic abutting portion coaxially fixedly connected to the cylindrical connecting portion with a prismatic structure, which is used to abut the inner wall fitting portion when under pressure so that the inner wall fitting portion is deformed; a circular abutting portion with a ring-shaped structure coaxially fixedly connected to the prismatic abutting portion is used to abut the surface fitting portion so that the surface fitting portion is deformed; an extension limiting portion for limiting the extension direction of the extension fitting portion is protruding and fixed on the outer edge of the circular abutting portion; and at least two groups of adhesive portions with gradually increasing diameters are sequentially provided on the circular abutting portion in a direction away from the cylindrical connecting portion.

[0009] The present invention is further configured as follows: the thickness of the inner wall bonding portion and the surface bonding portion is not less than 1 / 3 of the wall thickness of the pressure-resistant shell, and not more than 3 / 4 of the wall thickness of the pressure-resistant shell, the width of the surface bonding portion is not less than 1 / 2 of the diameter of the through hole and not more than the diameter of the through hole, and the flexible sealing ring is made of silicone material.

[0010] The present invention is further configured as follows: the bonding part is provided with 3 groups, which are respectively the first bonding part, the second bonding part and the third bonding part from the inside to the outside; the outer ring of the bonding part is provided with an adhesive to achieve bonding to the inner and outer surfaces of the pressure-resistant shell; the first bonding part is made of nitrile rubber to reduce the influence of vibration on the magnetic connection component; the second bonding part is made of aramid fiber material to enhance the anti-fatigue effect and prevent stress concentration; the third bonding part uses a waterproof cloth to achieve a waterproof function.

[0011] The present invention is further configured such that: a nano coating is provided on the outside of the third bonding portion to enhance corrosion resistance and wear resistance.

[0012] The present invention is further configured as follows: the magnetic connection component includes a magnet coaxially slidably connected to the cylindrical connection part, the cylindrical connection part is provided with a sliding groove, the magnet is provided with a sliding shaft slidably connected to the sliding groove, the sliding shaft is provided with a limit baffle, a sealing gasket is adhered and fixedly connected to the outside of the limit baffle, and a flexible compression gasket is fixedly connected between the magnet and the cylindrical connection part.

[0013] The present invention is further configured as follows: the flexible compression gasket is made of rubber material, the length of the sliding groove is equal to half the thickness of the inner wall fitting portion and the surface fitting portion, and the magnet is a permanent neodymium magnet.

[0014] The present invention is further configured as follows: the covering waterproofing assembly comprises a flexible covering waterproofing sheet adhered and fixedly connected to the outside of the pressure-resistant shell, and the flexible covering waterproofing sheet is provided with waterproof adhesive sheets on both sides along the width direction.

[0015] The second object of the present invention is to provide a method for reinforcing an opening of a cylindrical composite pressure-resistant shell, which has the advantage of having a good reinforcement effect under high pressure and vibration environments.

[0016] The above technical objectives of the present invention are achieved through the following technical solutions: a method for reinforcing an opening of a cylindrical composite pressure hull, using an opening reinforcement structure for a cylindrical composite pressure hull as described in any of the above technical solutions; comprising:

[0017] Step 1: Grind the inner wall of the through hole and remove the burrs around the through hole;

[0018] Step 2: Wrap the flexible sealing ring on the through hole;

[0019] Step 3, inserting the internal sealing reinforcement component and the external sealing reinforcement component into the through hole from the inside and the outside respectively, and connecting them through the magnetic connection component;

[0020] Step 4: Adhere and fix the covering waterproof component to the outside of the pressure-resistant shell.

[0021] In summary, the present invention has the following beneficial effects:

[0022] 1. A flexible sealing ring is coated on the through hole, and an internal sealing reinforcement component and an external sealing reinforcement component are respectively provided on the inner surface and the outer surface of the pressure-resistant shell, and the internal sealing reinforcement component and the external sealing reinforcement component are connected based on a magnetic connection component. When the pressure-resistant shell enters the water, the water pressure applies high pressure to the internal sealing reinforcement component and the external sealing reinforcement component, and the pressure pushes the prism abutting part and the annular abutting part to abut the flexible sealing ring, so that the internal fitting part and the surface fitting part of the flexible sealing gasket are deformed so as to be tightly attached to the inner and outer surfaces and the inner wall of the pressure-resistant shell, thereby enhancing the sealing performance while improving the strength around the through hole, ensuring the reinforcement effect, and at the same time, the magnetic connection component is connected to the cylindrical connection part. A magnet is arranged on the body and a flexible compression gasket is arranged between the magnet and the cylindrical connecting part. The water pressure compresses the flexible compression gasket by driving the internal sealing reinforcement component and the external sealing reinforcement component to approach each other, thereby improving the stability of the connection between the internal sealing reinforcement component and the external sealing reinforcement component. As the water pressure increases, the deformation degree of the flexible sealing ring and the flexible compression gasket will further increase, further improving the stability of the connection. At the same time, the connection is achieved through the magnetic force between the magnets. In a vibration environment, the stability of the connection between the internal sealing reinforcement component and the external sealing reinforcement component can always be maintained. At the same time, by arranging a first bonding part made of nitrile rubber, the influence of vibration on the magnetic connection component is further reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a cross-sectional view of the overall structure of this embodiment;

[0024] Figure 2 yes Figure 1 A magnified schematic diagram of part A;

[0025] Figure 3 yes Figure 1 A magnified schematic diagram of part B;

[0026] Figure 4 yes Figure 1 Enlarged schematic diagram of part C of FIG.

[0027] Figure markings: 1. pressure-resistant shell; 11. through hole; 2. flexible sealing ring; 21. inner wall fitting part; 22. surface fitting part; 23. extension fitting part; 3. internal sealing reinforcement assembly; 31. cylindrical connecting part; 32. prismatic abutting part; 33. circular ring abutting part; 34. extension limiting part; 35. bonding part; 36. first bonding part; 37. second bonding part; 38. third bonding part; 4. external sealing reinforcement assembly; 5. magnetic connection assembly; 51. magnet; 52. sliding groove; 53. sliding shaft; 54. limiting baffle; 55. sealing gasket; 56. flexible compression gasket; 6. coated waterproofing assembly; 61. flexible coated waterproofing sheet; 62. waterproof adhesive sheet. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0029] Embodiment 1:

[0030] refer to Figures 1 to 4 A hole reinforcement structure for a cylindrical composite pressure-resistant shell, comprising a pressure-resistant shell 1 and a through hole 11 opened on the pressure-resistant shell 1, and also comprising a flexible sealing ring 2 with a U-shaped cross-section for covering and fitting the inner wall and upper and lower surfaces of the through hole 11, and an internal sealing reinforcement component 3 and an external sealing reinforcement component 4 for respectively sealing and reinforcing the inner surface and outer surface of the pressure-resistant shell 1, wherein the internal sealing reinforcement component 3 and the external sealing reinforcement component 4 are connected based on a magnetic connection component 5, and a covering waterproofing component 6 for covering the external sealing reinforcement component 4 and isolating from seawater is adhered and fixedly connected to the outside of the pressure-resistant shell 1.

[0031] refer to Figure 1 and Figure 2Specifically, the flexible sealing ring 2 includes an inner wall fitting portion 21 for fitting the inner wall of the through hole 11 and a surface fitting portion 22 symmetrically arranged at both ends of the inner wall fitting portion 21 for fitting the inner surface and the outer surface of the pressure-resistant shell 1. The end of the surface fitting portion 22 away from the inner wall fitting portion 21 is fixedly connected with an arc-shaped or stepped structure, which is used to extend when the surface fitting portion 22 is compressed and deformed, so as to fit the inner and outer surfaces of the pressure-resistant shell 1 and the internal sealing reinforcement component 3 and the external sealing reinforcement component 4. When pressure is applied to the flexible sealing ring 2, the inner wall fitting portion 21 extends in the diameter direction, and the surface fitting portion 2 2 thickness is compressed and extended toward the extension fitting portion 23, thereby enhancing the sealing performance and improving the strength around the through hole 11, ensuring the reinforcement effect. In this embodiment, the thickness of the inner wall fitting portion 21 and the surface fitting portion 22 is not less than 1 / 3 of the wall thickness of the pressure-resistant shell 1, and not more than 3 / 4 of the wall thickness of the pressure-resistant shell 1, and the width of the surface fitting portion 22 is not less than 1 / 2 of the diameter of the through hole 11 and not more than the diameter of the through hole 11, thereby ensuring that the inner wall fitting portion 21 and the surface fitting portion 22 can produce sufficient deformation and ensure that the generated deformation can produce sufficient support for the through hole 11, and the flexible sealing ring 2 is made of silicone material.

[0032] refer to Figure 1 and Figure 2Specifically, the internal sealing reinforcement component 3 and the external sealing reinforcement component 4 have the same structure, both of which include a cylindrical connecting portion 31 coaxially arranged in the flexible sealing ring 2 and a prismatic abutting portion 32 coaxially fixedly connected to the cylindrical connecting portion 31 for abutting against the inner wall fitting portion 21 when under pressure so as to deform the inner wall fitting portion 21, and a circular ring abutting portion 33 coaxially fixedly connected to the prismatic abutting portion 32 for abutting against the surface fitting portion 22 so as to deform the surface fitting portion 22, and an extension limiting portion 34 for limiting the extension direction of the extension fitting portion 23 is protruding and fixed on the outer edge of the circular ring abutting portion 33. When the pressure-resistant shell 1 enters the water, the water pressure applies high pressure to the internal sealing reinforcement component 3 and the external sealing reinforcement component 4, and the pressure pushes the prismatic abutting portion 32 and the circular ring abutting portion 33 to abut against the flexible sealing ring 2, so that the internal fitting portion and the surface fitting portion of the flexible sealing pad are deformed. 22 is deformed so as to be tightly attached to the inner and outer surfaces and the inner wall of the pressure-resistant shell 1, thereby enhancing the sealing performance while improving the strength around the through hole 11, ensuring the reinforcement effect. The annular abutment portion 33 is provided with at least two groups of adhesive portions 35 with gradually increasing diameters in the direction away from the cylindrical connection portion 31. The adhesive portions 35 are attached to the inner and outer surfaces of the pressure-resistant shell 1. The adhesive portions 35 are provided with three groups, which are respectively the first adhesive portion 36, the second adhesive portion 37 and the third adhesive portion 38 from the inside to the outside. The outer circle of the adhesive portion 35 is provided with an adhesive to achieve bonding to the inner and outer surfaces of the pressure-resistant shell 1. The first adhesive portion 36 is made of nitrile rubber to reduce the influence of vibration on the magnetic connection component 5. The second adhesive portion 37 is made of aramid fiber material to enhance the anti-fatigue effect and prevent stress concentration. The third adhesive portion 38 uses a waterproof cloth to achieve a waterproof function. A nano coating is provided on the outside of the third adhesive portion 38 to enhance corrosion resistance and wear resistance.

[0033] refer to Figure 1 and Figure 3Specifically, the magnetic connection component 5 includes a magnet 51 coaxially slidably connected to the cylindrical connection part 31, a sliding groove 52 is provided on the cylindrical connection part 31, a sliding shaft 53 slidably connected in the sliding groove 52 is provided on the magnet 51, a limit baffle 54 is provided on the sliding shaft 53, a sealing gasket 55 is adhered and fixedly connected to the outside of the limit baffle 54, and a flexible compression gasket 56 is fixedly connected between the magnet 51 and the cylindrical connection part 31. The water pressure drives the internal sealing reinforcement component 3 and the external sealing reinforcement component 4 to approach each other, thereby compressing the flexible compression gasket 56, thereby improving the stability of the connection between the internal sealing reinforcement component 3 and the external sealing reinforcement component 4. At the same time, the connection is achieved through the magnetic force between the magnets 51, and the stability of the connection between the internal sealing reinforcement component 3 and the external sealing reinforcement component 4 can always be maintained in a vibration environment. At the same time, the first bonding portion 36 made of nitrile rubber is provided to further reduce the influence of vibration on the magnetic connection component 5. In this embodiment, the flexible compression gasket 56 is made of rubber material, the length of the sliding groove 52 is equal to half the thickness of the inner wall fitting portion 21 and the surface fitting portion 22, and the magnet 51 is a permanent neodymium magnet.

[0034] refer to Figure 1 and Figure 4 Specifically, the coating waterproofing assembly 6 includes a flexible coating waterproofing sheet 61 adhered and fixedly connected to the outside of the pressure-resistant shell 1. The flexible coating waterproofing sheet 61 is provided with waterproof adhesive sheets 62 on both sides along the width direction. The seawater is isolated from the external sealing reinforcement assembly 4 by the flexible coating waterproofing sheet 61, thereby increasing the service life of the flexible sealing ring 2. At the same time, the water pressure can also be transmitted to the external sealing reinforcement assembly 4. During subsequent maintenance, only the flexible coating waterproofing sheet 61 needs to be replaced, and there is no need to frequently replace the flexible sealing ring 2.

[0035] Embodiment 2:

[0036] A method for reinforcing an opening of a cylindrical composite pressure hull 1, using an opening reinforcing structure for a cylindrical composite pressure hull as shown in Example 1, comprising:

[0037] Step 1, grinding the inner wall of the through hole 11 to make it smooth and removing the burrs around the through hole 11;

[0038] Step 2: Wrap the flexible sealing ring 2 on the through hole 11;

[0039] Step 3, inserting the internal sealing reinforcement component 3 and the external sealing reinforcement component 4 into the through hole 11 from the inside and the outside respectively, and connecting them through the magnetic connection component 5;

[0040] Step 4: Adhere and fix the covering waterproof component 6 to the outside of the pressure-resistant shell 1.

[0041] This specific embodiment is only an explanation of the present invention, and it is not a limitation of the present invention. After reading this specification, those skilled in the art can make creative modifications to this embodiment as needed, but as long as it is within the scope of the claims of the present invention, it will be protected by the patent law.

Claims

1. An opening reinforcement structure for a cylindrical composite pressure hull, comprising a pressure hull (1) and a through hole (11) opened on the pressure hull (1); characterized in that: It also includes a flexible sealing ring (2) with a U-shaped cross-section, which is used to cover and fit the inner wall and upper and lower surfaces of the through hole (11), and an internal sealing reinforcement component (3) and an external sealing reinforcement component (4) for respectively sealing and reinforcing the inner surface and outer surface of the pressure-resistant shell (1), wherein the internal sealing reinforcement component (3) and the external sealing reinforcement component (4) are connected based on a magnetic connection component (5), and the pressure-resistant shell (1) is externally sleeved with a covering waterproof component (6) for covering the external sealing reinforcement component (4) and isolating from seawater; The flexible sealing ring (2) comprises an inner wall fitting portion (21) for fitting the inner wall of the through hole (11) and a surface fitting portion (22) symmetrically arranged at both ends of the inner wall fitting portion (21) for fitting the inner surface and the outer surface of the pressure-resistant shell (1); an end of the surface fitting portion (22) away from the inner wall fitting portion (21) is fixedly connected with an arc-shaped or stepped structure, and is used for extending when the surface fitting portion (22) is deformed under pressure, so as to fit the inner and outer surfaces of the pressure-resistant shell (1) and the inner sealing reinforcement component (3) and the outer sealing reinforcement component (4); The internal sealing reinforcement component (3) and the external sealing reinforcement component (4) have the same structure, and both include a cylindrical connecting portion (31) coaxially arranged in the flexible sealing ring (2), and a prismatic abutting portion (32) coaxially fixedly connected to the cylindrical connecting portion (31) in a prismatic structure, and used to abut against the inner wall abutting portion (21) when under pressure, so that the inner wall abutting portion (21) is deformed, and the prismatic abutting portion (32) coaxially fixedly connected to the cylindrical connecting portion (31) in a prismatic structure The cylindrical connecting portion (31) is fixedly connected with a circular abutting portion (33) in an annular structure for abutting the surface fitting portion (22) so as to deform the surface fitting portion (22); an extension limiting portion (34) is fixedly provided on the outer edge of the circular abutting portion (33) for limiting the extension direction of the extension fitting portion (23); and the circular abutting portion (33) is provided with at least two groups of adhesive portions (35) with gradually increasing diameters in sequence in a direction away from the cylindrical connecting portion (31).

2. The opening reinforcement structure for a cylindrical composite pressure hull according to claim 1, characterized in that: The thickness of the inner wall fitting portion (21) and the surface fitting portion (22) is not less than 1 / 3 of the wall thickness of the pressure-resistant shell (1) and not more than 3 / 4 of the wall thickness of the pressure-resistant shell (1); the width of the surface fitting portion (22) is not less than 1 / 2 of the diameter of the through hole (11) and not more than the diameter of the through hole (11); and the flexible sealing ring (2) is made of silicone material.

3. The opening reinforcement structure for a cylindrical composite pressure hull according to claim 1, characterized in that: The bonding part (35) is provided with three groups, which are respectively the first bonding part (36), the second bonding part (37) and the third bonding part (38) from the inside to the outside. The outer ring of the bonding part (35) is provided with an adhesive to achieve bonding to the inner and outer surfaces of the pressure-resistant shell (1). The first bonding part (36) is made of nitrile rubber to reduce the influence of vibration on the magnetic connection component (5). The second bonding part (37) is made of aramid fiber material to enhance the anti-fatigue effect and prevent stress concentration. The third bonding part (38) uses waterproof cloth to achieve waterproof function.

4. The opening reinforcement structure for a cylindrical composite pressure hull according to claim 3, characterized in that: The third bonding portion (38) is provided with a nano coating on the outside to enhance corrosion resistance and wear resistance.

5. The opening reinforcement structure for a cylindrical composite pressure hull according to claim 1, characterized in that: The magnetic connection assembly (5) comprises a magnet (51) coaxially slidably connected to the cylindrical connection part (31); a sliding groove (52) is provided on the cylindrical connection part (31); a sliding shaft (53) is provided on the magnet (51) and is slidably connected to the sliding groove (52); a limit baffle (54) is provided on the sliding shaft (53); a sealing gasket (55) is arranged on the outer shell of the limit baffle (54); and a flexible compression gasket (56) is fixedly connected between the magnet (51) and the cylindrical connection part (31).

6. The opening reinforcement structure for a cylindrical composite pressure hull according to claim 5, characterized in that: The flexible compression gasket (56) is made of rubber material, the length of the sliding groove (52) is equal to half the thickness of the inner wall fitting portion (21) and the surface fitting portion (22), and the magnet (51) is a permanent neodymium magnet.

7. The opening reinforcement structure for a cylindrical composite pressure hull according to claim 1, characterized in that: The covering waterproofing assembly (6) comprises a flexible covering waterproofing sheet (61) which is adhered and fixedly connected to the outside of the pressure-resistant shell (1), and the flexible covering waterproofing sheet (61) is provided with waterproof adhesive sheets (62) on both sides along the width direction.

8. A method for reinforcing an opening of a cylindrical composite pressure hull (1), using an opening reinforcing structure for a cylindrical composite pressure hull as described in any one of claims 1 to 7; characterized in that: include: Step 1, grinding the inner wall of the through hole (11) to make it smooth and removing the burrs around the through hole (11); Step 2: Wrap the flexible sealing ring (2) on the through hole (11); Step 3, inserting the internal sealing reinforcement component (3) and the external sealing reinforcement component (4) into the through hole (11) from the inside and the outside respectively, and connecting them via the magnetic connection component (5); Step 4: Adhere and fix the covering waterproof component (6) to the outside of the pressure-resistant shell (1).

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