CN112312712A - Fiber resin matrix composite pressure-resistant shell opening reinforcing and sealing structure - Google Patents
Fiber resin matrix composite pressure-resistant shell opening reinforcing and sealing structure Download PDFInfo
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- CN112312712A CN112312712A CN202011147344.7A CN202011147344A CN112312712A CN 112312712 A CN112312712 A CN 112312712A CN 202011147344 A CN202011147344 A CN 202011147344A CN 112312712 A CN112312712 A CN 112312712A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/06—Hermetically-sealed casings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B3/00—Hulls characterised by their structure or component parts
- B63B3/13—Hulls built to withstand hydrostatic pressure when fully submerged, e.g. submarine hulls
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/06—Hermetically-sealed casings
- H05K5/062—Hermetically-sealed casings sealed by a material injected between a non-removable cover and a body, e.g. hardening in situ
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/06—Hermetically-sealed casings
- H05K5/069—Other details of the casing, e.g. wall structure, passage for a connector, a cable, a shaft
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses an open pore reinforced sealing structure of a pressure shell made of a fiber resin matrix composite material, which consists of a reinforcing piece, a nonstandard sealing check ring and an end cover; the reinforcing piece is integrally formed through a die-casting process and is bonded with the hole in the wall of the composite material pressure-proof casing and the inner surface of the casing around the hole through high-viscosity epoxy resin glue; one end of the nonstandard sealing check ring is a curved surface, the other end of the nonstandard sealing check ring is a plane, and the curved surface end is completely attached to the outer surface of the composite material pressure shell; the end cover is in threaded connection with the reinforcing piece and forms extrusion contact with the plane end of the nonstandard sealing retainer ring; the sealing ring is arranged in the end face sealing groove of the reinforcing piece and forms axial sealing with the end face of the reinforcing piece through the extrusion of the bottom of the end cover. The opening reinforcing sealing structure of the pressure-resistant shell is designed by designing a reinforcing piece with good fitting degree with the inner wall of the shell and a nonstandard sealing check ring with good fitting degree with the outer wall of the shell, and the contact area is increased, so that the integral structural strength after reinforcement is improved, and the hole edge stress after reinforcement is reduced; it is convenient to disassemble and assemble and has wide application range.
Description
Technical Field
The invention relates to a structural design and manufacturing technology of a composite material pressure shell, in particular to an open pore reinforced sealing structure of a fiber resin matrix composite material pressure shell.
Background
In order to meet the requirements of a plurality of different tasks of marine environment monitoring, resource exploration and military safety, the great diving depth and the light weight are becoming important development directions of underwater vehicles (AUV). The pressure shell is a core component of the underwater vehicle and has enough strength and stability so as to protect internal instruments, equipment, electronic components and the like and prevent the instruments, the equipment, the electronic components and the like from being damaged by seawater pressure. In addition, the pressure hull must meet the requirement of light weight under large submergence depth conditions, thereby increasing the payload of the underwater vehicle. Compared with the traditional metal materials such as high-strength steel, aluminum alloy, titanium alloy and the like, the fiber resin matrix composite material has low density, light weight and high strength, and can reduce the weight by 40-50 percent compared with the metal material pressure shell under the condition of meeting the structural strength and stability requirements, thereby greatly improving the effective load of the underwater vehicle. In addition, the fiber composite pressure-resistant shell also has good corrosion resistance, fatigue resistance and vibration and noise reduction characteristics, and is particularly suitable for the design requirement of large load of a large-submersible vehicle.
The composite material has the characteristics of high specific strength, high specific modulus and strong designability. Due to the requirement of lightweight design, the underwater vehicle adopts composite material design, so that the structural weight can be greatly reduced, the comprehensive performance of the vehicle body is improved, the task load is increased, and the endurance time is prolonged.
In the structural design of the pressure-resistant shell, in order to conveniently replace electronic components inside the pressure-resistant shell or facilitate later maintenance, holes are often required to be formed in the pressure-resistant shell. However, composite pressure containment vessel venting presents significant challenges; on one hand, the opening causes discontinuous fibers, the strength of the opening position is greatly reduced, a reinforcing structure needs to be designed for reinforcement, and meanwhile, the local stress of the structure around the hole needs to be reduced; on the other hand, the sealing of the opening and the reinforcing part is also very critical, and the edge of the opening after the opening of the pressure shell is a special-shaped curved surface, so that the sealing after the reinforcing becomes very difficult.
The invention patent 201910552022.1 discloses a sealing structure and method for an open-pore composite end socket, which provides a sealing structure for a composite shell, but the sealing structure is permanently sealed and cannot be disassembled, and the sealing structure cannot meet the requirements of frequent replacement or maintenance of electronic components.
Disclosure of Invention
In order to avoid the defects in the prior art, the invention provides an open pore reinforced sealing structure of a pressure shell made of a fiber resin matrix composite material; according to the perforated reinforcing sealing structure of the composite pressure-resistant shell, the contact area of the reinforcing bottom plate which is well attached to the inner wall of the shell and the nonstandard sealing retainer ring which is well attached to the outer wall of the shell are increased, the integral structure strength after reinforcement is improved, the hole edge stress after reinforcement is reduced, and the stress of the integral structure after reinforcement is more uniform; the defects that the reinforced hole edge fiber composite material is easy to generate layering failure and the sealing structure is not detachable are overcome.
The invention solves the technical problem by adopting the technical scheme that the composite material pressure-proof casing comprises a composite material pressure-proof casing body, a reinforcing piece, a nonstandard sealing check ring, an end cover, a sealing ring, a bottom plate, a surrounding wall and epoxy resin glue, and is characterized in that the reinforcing piece and the composite material pressure-proof casing body are fixedly connected in a bonding way through the epoxy resin glue with high bonding strength on the inner surfaces of the casing body at the hole and the hole periphery; the nonstandard sealing check ring is positioned at the lower part of the end cover and is attached to the outer surface of the shell around the hole of the pressure-resistant shell made of the composite material, the end cover is in threaded connection with the reinforcement and forms extrusion contact with the flat end face of the nonstandard sealing check ring, the sealing ring is arranged in the sealing groove at the upper end part of the reinforcement and forms axial sealing by extruding the bottom of the end cover and the end face of the reinforcement;
the reinforcing piece is integrally formed by a circular arc surface base plate and a surrounding wall,a circular through hole is formed in the center of the reinforcing part, the radius of the arc of the upper surface of the reinforcing part is consistent with that of the inner surface of the composite material pressure shell, a glue groove is formed in the upper surface of the bottom plate of the reinforcing part, the depth of the glue groove is 0.2-0.5 mm, and equal-radius chamfers are arranged at the four corners of the bottom plate and the four corners of the glue groove; the end face of the reinforcing part surrounding wall is provided with a sealing groove, the outer surface of the reinforcing part surrounding wall is circumferentially provided with threads, and the length L of the threads meets the following formula, namely L is 1.1-1.3 (H)em-Ht-Hg-Hsm) In the formula, HemIs the minimum height of the enclosure wall, HtIs the thickness of the composite pressure-resistant shell, HgIs the thickness of an epoxy resin adhesive layer HsmThe minimum axial height of the nonstandard sealing retainer ring; outer diameter D of enclosure wallwThe diameter D of the hole of the pressure-resistant shell made of the composite materialkSatisfies the relationship of 0.2<Dk-Dw<0.5mm；
One end of the nonstandard sealing check ring is a curved surface, the other end of the nonstandard sealing check ring is a plane, the curved surface end of the nonstandard sealing check ring is completely attached to the outer surface of the composite material pressure-resistant shell, the plane end of the nonstandard sealing check ring is in contact fit with the end cover, and the nonstandard sealing check ring and the reinforcement are coaxial;
the outer diameter of the end cover is the same as the diameter of the non-standard sealing retainer ring, and is not less than 1.5 times of the aperture; the end cap internal axial length L1Satisfies the relation L1＝1.1～1.3*(Hem-Ht-Hg-Hsm) In the formula, HemIs the minimum height of the enclosure wall, HtIs the thickness of the composite pressure-resistant shell, HgIs the thickness of an epoxy resin adhesive layer HsmThe minimum axial height of the nonstandard sealing retainer ring; the inner surface of the end cover is circumferentially provided with internal threads, and the threads are matched with the external threads of the reinforcement surrounding wall.
The nonstandard sealing check ring is coaxial with the reinforcing piece and is in interference fit with the reinforcing piece.
The epoxy resin glue is high-bonding-strength epoxy resin glue.
Advantageous effects
The invention provides a fiber resin matrix composite pressure shell opening reinforcing sealing structure which is composed of a reinforcing piece, a nonstandard sealing retainer ring, an end cover and a sealing ring; the reinforcement is integrally formed through a die-casting process and is bonded with the hole of the fiber composite material pressure shell and the inner surface of the shell near the hole through epoxy resin glue with high bonding strength; the curved surface end of the nonstandard sealing retainer ring is completely attached to the outer surface of the fiber composite pressure-resistant shell; the end cap is in threaded connection with the reinforcement and makes compressive contact with the flat end of the non-standard sealing collar; the sealing ring is arranged in the end face sealing groove of the reinforcing piece and forms axial sealing with the end face of the reinforcing piece through the extrusion of the bottom of the end cover. According to the perforated reinforcing sealing structure of the composite pressure-resistant shell, the contact area of the reinforcing bottom plate which is well attached to the inner wall of the shell and the nonstandard sealing retainer ring which is well attached to the outer wall of the shell is increased, the integral structural strength after reinforcement is improved, and the hole edge stress after reinforcement is reduced; the problems of sudden strength drop, insufficient reinforcing strength and undetachable sealing structure after the fiber composite pressure-resistant shell is opened are solved.
The opening reinforcing and sealing structure of the fiber resin-based composite material pressure shell is suitable for composite material pressure shells with different diameters and different opening size requirements, and is convenient to disassemble and assemble, good in reliability and wide in application range.
Drawings
The present invention will be described in detail with reference to the accompanying drawings and embodiments.
FIG. 1 is a schematic view of the open pore reinforced sealing structure of the pressure shell made of fiber resin matrix composite material.
Fig. 2 is an isometric view of a reinforcement member of the composite pressure casing open pore reinforcement seal structure of the present invention.
FIG. 3(a) is a side view of a reinforcement member for the open pore reinforced sealing structure of the composite pressure casing of the present invention;
fig. 3(b) is a front view of a reinforcement member of the open pore reinforced sealing structure of the composite pressure casing of the present invention.
FIG. 4 is an isometric view of a non-standard sealing gasket of the present invention.
FIG. 5(a) is a front view of a non-standard gasket of the present invention;
fig. 5(b) is a side view of a non-standard gasket of the present invention.
In the drawings
1. Composite pressure shell 2, reinforcing piece 3, nonstandard sealing retainer ring 4, end cover 5, sealing ring 6, bottom plate 7 and surrounding wall
Detailed Description
The embodiment is an opening reinforcing and sealing structure of a pressure shell made of a fiber resin matrix composite material.
Referring to fig. 1 to 5(b), the open pore reinforced sealing structure of the fiber resin-based composite pressure casing of the present embodiment is composed of a composite pressure casing 1, a reinforcement 2, a nonstandard sealing ring 3, an end cover 4, a sealing ring 5, a bottom plate 6, a surrounding wall 7 and epoxy resin glue; the carbon fiber resin matrix composite pressure-resistant shell is formed by a fiber winding process. The reinforcement is a main metal part for reinforcing the opening of the pressure shell made of the fiber composite material, is integrally formed, is preferably made of a high-strength titanium alloy material TC4, and is manufactured by a die-casting process or a machining and 3D material increase manufacturing mode.
In this embodiment, the reinforcement 2 and the composite pressure casing 1 are bonded and fixedly connected through high-bonding-strength epoxy resin glue at the inner surface of the casing in and near the hole. The nonstandard sealing retainer ring 3 and the reinforcing piece 2 have the same axle center, and the curved end surface is completely attached to the outer surface of the composite pressure-resistant shell; the nonstandard sealing retainer ring 3 is positioned at the lower part of the end cover 4, and the end cover 4 is in threaded connection with the reinforcing piece 2 and forms extrusion contact with the flat end face of the nonstandard sealing retainer ring. The sealing ring 5 is placed in a sealing groove at the end part of the reinforcement 2 and is extruded with the end surface of the reinforcement 2 through the bottom of the end cover 4 to form axial sealing.
The reinforcement 2 is integrally formed by an arc surface bottom plate and a surrounding wall, a circular through hole is formed in the center of the reinforcement 2, and the upper surface of the reinforcement 2 is consistent with the arc radius of the inner surface of the composite material pressure-resistant shell 1. The upper surface of the bottom plate of the reinforcement 2 is provided with a glue groove, the depth of the glue groove is 0.2-0.5 mm, and the four corners of the bottom plate and the four corners of the glue groove are respectively provided with an equal-radius chamfer; the end face of the reinforcement surrounding wall is provided with a sealing groove. The outer surface of the peripheral wall of the reinforcing part is circumferentially provided with threads, and the length L of the threads meets the following formula, namely L is 1.1-1.3 (H)em-Ht-Hg-Hsm) In the formula, HemIs the minimum height of the enclosure wall, HtIs the thickness of the pressure-resistant shell made of composite material，HgIs the thickness of an epoxy resin adhesive layer HsmThe minimum axial height of the nonstandard sealing retainer ring; outer diameter D of reinforcement enclosure wallwThe diameter D of the hole of the pressure-resistant shell made of the composite materialkSatisfies the relationship of 0.2<Dk-Dw<0.5mm, a through hole is formed in the middle of the reinforcing piece 2, the upper surface and the lower surface of the bottom plate are both arc surfaces, the radius of the arc surface of the upper surface is equal to the inner diameter of the composite material pressure shell, the longitudinal arc length of the arc surface is equal to the transverse arc length of the arc surface, and the arc length is not less than 1.5 times of the hole diameter. The reinforcement 2 and the composite material pressure shell 1 are bonded through high bonding strength epoxy resin glue to meet the requirement of high bonding strength.
One end of the nonstandard sealing check ring 3 is a curved surface, the other end of the nonstandard sealing check ring 3 is a plane, the curved surface end of the nonstandard sealing check ring 3 is completely attached to the outer surface of the composite material pressure-resistant shell, and the plane end is in contact fit with the end cover 4. The nonstandard sealing check ring is coaxially and in interference fit with the reinforcing piece.
The end cover 4 is made of the same metal material as the reinforcing piece 2, so that the coordination and consistency of compression deformation are ensured; the outer diameter of the end cover 4 is equal to the diameter of the nonstandard sealing retainer ring 3, and is not less than 1.5 times of the hole diameter. End cap 4 internal axial length L1Satisfies the relation L1＝1.1～1.3*(Hem-Ht-Hg-Hsm) In the formula, HemIs the minimum height of the enclosure wall, HtIs the thickness of the composite pressure-resistant shell, HgIs the thickness of an epoxy resin adhesive layer HsmThe minimum axial height of the nonstandard sealing retainer ring; the inner surface of the end cover 4 is circumferentially provided with internal threads, and the threads are matched with the external threads of the reinforcement surrounding wall.
Opening reinforcing and sealing structure mounting mode for pressure-resistant shell made of carbon fiber composite material
(1) Placing the reinforcing piece at the hole through the end part of the composite material pressure-resistant shell, keeping the surrounding wall of the reinforcing piece coaxial with the hole, and fixing the reinforcing piece by using an auxiliary tool so that the upper surface of the bottom plate of the reinforcing piece is completely attached to the inner surface of the composite material pressure-resistant shell;
(2) injecting high-bonding-strength epoxy resin glue through a gap between the reinforcement surrounding wall and the hole, and cooling and solidifying to form high-quality bonding; the bonding surface of the bottom plate of the reinforcing piece is an arc surface, the diameter of the bonding surface is equal to the inner diameter of the pressure-resistant shell made of the composite material, so that the reinforcing piece is uniformly bonded with the inner surface of the shell, and the bonding quality is good; the reinforcement and the outer surface of the hole are completely sealed through the nonstandard sealing check ring, so that the weak part of the reinforcement and the hole, namely the bonding interface, is effectively protected, and the reliability is high;
(3) loading the nonstandard sealing check ring through the end face of the surrounding wall, and forming interference fit with the surrounding wall; the nonstandard sealing check ring and the composite material pressure-resistant shell have larger contact area, so that hydrostatic pressure applied to the end cover is uniformly dispersed to the contact surface of the nonstandard sealing check ring and the shell, and the material failure caused by stress concentration of the hole-edge shell is prevented.
(4) Placing an O-shaped sealing ring in a sealing groove at the end face of the reinforcing part surrounding wall;
(5) and (3) keeping the coaxial centers of the end cover and the reinforcing piece, screwing the end cover to enable the end cover to be in contact with the non-standard sealing retainer ring, continuing screwing the end cover to enable the compression amount of the O-shaped sealing ring to reach about 20%, and enabling the axial compression ratio of the non-standard sealing retainer ring to reach 10-20% to ensure better sealing property. The end cover is connected with the reinforcement surrounding wall through threads, so that the disassembly is convenient; the composite material shell between the reinforcing piece bottom plate and the end face of the end cover is compacted by applying force along the axial direction of the hole by screwing the end cover, and the delamination failure of the hole edge composite material pressure shell caused by hole opening is prevented.
The opening reinforcing and sealing structure of the fiber resin-based composite pressure-resistant shell is suitable for composite pressure-resistant shells with different diameters and different opening size requirements; the device is convenient to disassemble and assemble, high in reliability and wide in application range.
Claims (3)
1. A fiber resin based composite material pressure shell open pore reinforcement sealing structure comprises a composite material pressure shell, a reinforcement, a nonstandard sealing retainer ring, an end cover, a sealing ring, a bottom plate, a surrounding wall and epoxy resin glue, and is characterized in that the reinforcement and the composite material pressure shell are fixedly connected in the hole and the inner surface of the shell around the hole through the high-bonding-strength epoxy resin glue; the nonstandard sealing check ring is positioned at the lower part of the end cover and is attached to the outer surface of the shell around the hole of the pressure-resistant shell made of the composite material, the end cover is in threaded connection with the reinforcement and forms extrusion contact with the flat end face of the nonstandard sealing check ring, the sealing ring is arranged in the sealing groove at the upper end part of the reinforcement and forms axial sealing by extruding the bottom of the end cover and the end face of the reinforcement;
the reinforcement is integrally formed by an arc-surface bottom plate and a surrounding wall, a round through hole is formed in the center of the reinforcement, the upper surface of the reinforcement is consistent with the arc radius of the inner surface of the composite material pressure-resistant shell, a glue groove is formed in the upper surface of the bottom plate of the reinforcement, the depth of the glue groove is 0.2-0.5 mm, and chamfering angles with equal radius are formed at the four corners of the bottom plate and the four corners of the glue groove; the end face of the reinforcing part surrounding wall is provided with a sealing groove, the outer surface of the reinforcing part surrounding wall is circumferentially provided with threads, and the length L of the threads meets the following formula, namely L is 1.1-1.3 (H)em-Ht-Hg-Hsm) In the formula, HemIs the minimum height of the enclosure wall, HtIs the thickness of the composite pressure-resistant shell, HgIs the thickness of an epoxy resin adhesive layer HsmThe minimum axial height of the nonstandard sealing retainer ring; outer diameter D of enclosure wallwThe diameter D of the hole of the pressure-resistant shell made of the composite materialkSatisfies the relationship of 0.2<Dk-Dw<0.5mm；
One end of the nonstandard sealing check ring is a curved surface, the other end of the nonstandard sealing check ring is a plane, the curved surface end of the nonstandard sealing check ring is completely attached to the outer surface of the composite material pressure-resistant shell, the plane end of the nonstandard sealing check ring is in contact fit with the end cover, and the nonstandard sealing check ring and the reinforcement are coaxial;
the outer diameter of the end cover is the same as the diameter of the non-standard sealing retainer ring, and is not less than 1.5 times of the aperture; the end cap internal axial length L1Satisfies the relation L1＝1.1～1.3*(Hem-Ht-Hg-Hsm) In the formula, HemIs the minimum height of the enclosure wall, HtIs the thickness of the composite pressure-resistant shell, HgIs the thickness of an epoxy resin adhesive layer HsmThe minimum axial height of the nonstandard sealing retainer ring; the inner surface of the end cover is circumferentially provided with internal threads, and the threads are matched with the external threads of the reinforcement surrounding wall.
2. The open pore reinforced sealing structure of the pressure shell made of the fiber resin matrix composite material as claimed in claim 1, wherein the nonstandard sealing retainer ring and the reinforcement are coaxial and in interference fit.
3. The open pore reinforced sealing structure of the pressure shell made of fiber resin matrix composite material as claimed in claim 1, wherein the epoxy resin adhesive is high bonding strength epoxy resin adhesive.
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Cited By (2)
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| CN114604353A (en) * | 2022-03-01 | 2022-06-10 | 西北工业大学 | Sealing reinforcing structure after opening of underwater composite pressure shell and application |
| CN117162530A (en) * | 2023-11-02 | 2023-12-05 | 北京玻钢院复合材料有限公司 | Composite pressure-resistant shell with built-in metal ring, preparation method thereof and sealing connection method of composite pressure-resistant shell and flange |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114604353A (en) * | 2022-03-01 | 2022-06-10 | 西北工业大学 | Sealing reinforcing structure after opening of underwater composite pressure shell and application |
| CN117162530A (en) * | 2023-11-02 | 2023-12-05 | 北京玻钢院复合材料有限公司 | Composite pressure-resistant shell with built-in metal ring, preparation method thereof and sealing connection method of composite pressure-resistant shell and flange |
| CN117162530B (en) * | 2023-11-02 | 2024-03-08 | 北京玻钢院复合材料有限公司 | Composite pressure-resistant shell with built-in metal ring, preparation method thereof and sealing connection method of composite pressure-resistant shell and flange |
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|---|---|
| CN112312712B (en) | 2021-11-26 |
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