A high-reliability connection structure and method for composite pressure-resistant shell

Abstract

The present invention discloses a high-reliability connection structure and method for a composite pressure-resistant shell, which belongs to the technical field of composite pressure-resistant shells. The structure and method include a metal end frame, one end of which is provided with a first anti-rotation structure; a composite pressure-resistant shell, a port of which is provided with a second anti-rotation structure, and the composite pressure-resistant shell is connected to the metal end frame through the second anti-rotation structure and the first anti-rotation structure; an adhesive layer is provided between the contact surface of the metal end frame and the composite pressure-resistant shell; the shaft head of the metal end frame is connected with an anti-slip device, and the anti-slip device is in contact with the composite pressure-resistant shell. The connection reliability of the present invention is high, and it will not cause the fiber of the composite pressure-resistant shell to be interrupted. It can well maintain the fiber continuity of the composite material, ensure the strength of the composite pressure-resistant shell, and reduce the risk of using the pressure-resistant shell.

Description

Technical Field

[0001] The present invention relates to the technical field of composite pressure-resistant shells, and in particular to a high-reliability connection structure and method for composite pressure-resistant shells. Background Art

[0002] Composite pressure hulls have the characteristics of light weight, high strength, and resistance to seawater corrosion. In recent years, the demand for composite pressure hulls in marine activities has increased. The lightweight characteristics of composite materials can greatly reduce the overall weight of equipment and increase the equipment's range. The equipment can carry more battery equipment to increase the equipment's range, and can also carry more detection equipment. However, expensive and sophisticated equipment is stored inside the shells of marine detection equipment, underwater weapons, gliders, etc., so the reliability of the pressure hull connection becomes particularly important. For equipment used in deep-sea environments, it is also necessary to withstand the high pressure brought by seawater, which brings more stringent tests to the connection structure of the pressure hull.

[0003] Currently, the connection between the composite pressure hull and metal components is mainly achieved through bolting and adhesive bonding. However, directly connecting the composite pressure hull and metal components through bolting will cause the interruption of fibers in the composite pressure hull. When subjected to force, the connection parts are prone to stress concentration. During long-term use under high external pressure, there is a risk of damage to the pressure hull. Adhesive bonding is greatly affected by the thickness of the adhesive layer and the environment. If used alone, it is difficult to ensure the reliability of the connection. Summary of the Invention

[0004] In response to the above-mentioned deficiencies in the prior art, the present invention provides a high-reliability connection structure and method for a composite pressure-resistant shell; the high-reliability connection structure and method for a composite pressure-resistant shell have high connection reliability and will not cause fiber interruption in the composite pressure-resistant shell. They can well maintain the fiber continuity of the composite material, ensure the strength of the composite pressure-resistant shell, and reduce the risk of using the pressure shell.

[0005] In order to solve the above technical problems, the present invention provides a high-reliability connection structure of a composite pressure-resistant shell, comprising:

[0006] A metal end frame, one end of which is provided with a first anti-rotation structure;

[0007] A composite pressure hull, wherein a port of the composite pressure hull is provided with a second anti-rotation structure, and the composite pressure hull and the metal end frame are connected to the first anti-rotation structure via the second anti-rotation structure;

[0008] an adhesive layer provided between the contact surface of the metal end frame and the composite pressure-resistant shell;

[0009] The shaft head of the metal end frame is connected with an anti-slip device, and the anti-slip device is in contact connection with the composite material pressure-resistant shell.

[0010] In a further improvement of the present invention, when the wall thickness of the composite pressure-resistant shell is less than 10 mm, the first anti-rotation structure is a stepped anti-rotation groove provided at the position of the metal end frame axis, and the second anti-rotation structure is a stepped anti-rotation boss provided on the inner wall of the inner flange of the composite pressure-resistant shell, and the stepped anti-rotation boss is plugged into the stepped anti-rotation groove;

[0011] A keyway is provided on the inner side of the stepped anti-rotation boss, and a key is installed in the keyway;

[0012] The anti-slip device is a connecting flange, which is connected to the metal end frame shaft head and is in contact with the inner flange of the composite pressure-resistant shell.

[0013] Through the above design, this solution can more easily connect the composite pressure-resistant shell and the metal end frame.

[0014] In a further improvement of the present invention, when the wall thickness of the composite pressure-resistant shell is greater than 10 mm, the first anti-rotation structure is an anti-rotation groove provided at the position of the metal end frame ring, and the second anti-rotation structure is an anti-rotation boss provided on the end head of the composite pressure-resistant shell, and the anti-rotation boss is plugged into the anti-rotation groove;

[0015] The anti-slip device is a connecting flange, which is connected to the metal end frame shaft head and is in contact with the inner flange of the composite pressure-resistant shell.

[0016] Through the above design, this solution can more easily connect the composite pressure-resistant shell and the metal end frame.

[0017] In a further improvement of the present invention, when the diameter of the composite pressure hull is greater than 500 mm and the wall thickness is greater than 30 mm, the first anti-rotation structure is a first anti-rotation groove provided at the edge of the metal end frame shaft head, and the second anti-rotation structure is a second anti-rotation groove provided on the inner flange of the composite pressure hull;

[0018] The anti-slip device includes a connecting plate, and the connecting plate is provided with an anti-slip boss;

[0019] The first anti-rotation groove and the second anti-rotation groove are aligned to form a coupling groove, the anti-slip boss is plugged into the coupling groove, and the connecting plate is connected to the metal end frame shaft head.

[0020] Through the above design, this solution can more easily connect the composite pressure-resistant shell and the metal end frame.

[0021] In one aspect, the present invention provides a high-reliability connection method for a composite pressure-resistant shell, comprising the following steps:

[0022] Step S1, pre-arranging a first anti-rotation structure on the metal end frame;

[0023] Step S2, pre-arranging a second anti-rotation structure on the composite pressure hull to cooperate with the first anti-rotation structure;

[0024] Step S3, grinding the bonding surface of the composite pressure hull into a rough surface and cleaning the rough surface;

[0025] Step S4, sandblasting the bonding surface of the metal end frame into a sandblasted surface, cleaning the sandblasted surface, and applying structural adhesive;

[0026] Step S5, bonding the bonding surface of the composite pressure-resistant casing to the bonding surface of the metal end frame, at which point the first anti-rotation structure and the second anti-rotation structure are matched and connected;

[0027] Step S6, heating and curing the matched and connected metal end frame and the composite pressure-resistant shell;

[0028] Step S7: After the product is taken out of the furnace, the anti-slip device is connected to the metal end frame and is in contact with the inner flange of the composite pressure-resistant shell;

[0029] In step S8, the metal end frame and the composite pressure hull are heated and cured again, and the connection between the metal end frame and the composite pressure hull is completed.

[0030] Through the above design, this solution can more easily connect the composite pressure-resistant shell and the metal end frame.

[0031] In a further improvement of the present invention, the wall thickness of the composite pressure-resistant shell is less than 10 mm, the first anti-rotation structure in step S1 is a stepped anti-rotation groove provided at the position of the metal end frame axis, and the second anti-rotation structure in step S2 is a stepped anti-rotation boss provided on the inner wall of the inner flange of the composite pressure-resistant shell, and the stepped anti-rotation boss is plugged into the stepped anti-rotation groove;

[0032] A keyway is provided on the inner side of the stepped anti-rotation boss, and a key is installed in the keyway;

[0033] The anti-slip device in step S7 is a connecting flange, which is connected to the metal end frame shaft head and is in contact with the inner flange of the composite pressure-resistant shell.

[0034] Through the above design, this solution can more easily connect the composite pressure-resistant shell and the metal end frame.

[0035] In a further improvement of the present invention, the wall thickness of the composite pressure-resistant shell is greater than 10 mm, the first anti-rotation structure in step S1 is an anti-rotation groove provided at the position of the metal end frame ring, and the second anti-rotation structure in step S2 is an anti-rotation boss provided on the end head of the composite pressure-resistant shell, and the anti-rotation boss is plugged into the anti-rotation groove;

[0036] The anti-slip device in step S7 is a connecting flange, which is connected to the metal end frame shaft head and is in contact with the inner flange of the composite pressure-resistant shell.

[0037] Through the above design, this solution can more easily connect the composite pressure-resistant shell and the metal end frame.

[0038] In a further improvement of the present invention, the composite pressure hull has a diameter greater than 500 mm and a wall thickness greater than 30 mm, the first anti-rotation structure in step S1 is a first anti-rotation groove provided at an edge of the metal end frame shaft head, and the second anti-rotation structure in step S2 is a second anti-rotation groove provided on an inner flange of the composite pressure hull;

[0039] The anti-slip device in step S7 includes a connecting plate, and the connecting plate is provided with an anti-slip boss;

[0040] The first anti-rotation groove and the second anti-rotation groove are aligned to form a coupling groove, the anti-slip boss is plugged into the coupling groove, and the connecting plate is connected to the metal end frame shaft head.

[0041] Through the above design, this solution can more easily connect the composite pressure-resistant shell and the metal end frame.

[0042] In one aspect, the present invention provides a high-reliability connection structure for a composite pressure-resistant shell, comprising:

[0043] A metal end frame, wherein a first anti-rotation and anti-slip groove is provided on the edge of the shaft head of the metal end frame;

[0044] A composite pressure-resistant shell, wherein a port of the composite pressure-resistant shell is provided with a second anti-rotation and anti-slip groove, and the composite pressure-resistant shell and the metal end frame are connected to each other through the second anti-rotation and anti-slip groove and the first anti-rotation and anti-slip groove.

[0045] Through the above design, this solution can more easily connect the composite pressure-resistant shell and the metal end frame.

[0046] In one aspect, the present invention provides a high-reliability connection method for a composite pressure-resistant shell, comprising the following steps:

[0047] Step S1, pre-arranging a first anti-rotation and anti-slip groove on the metal end frame shaft;

[0048] Step S2: Put the metal end frame on the end of the mold, stick a release cloth on the end of the metal end frame, and then install the wooden head. At this time, the wooden head is sleeved on the central axis of the mold;

[0049] Step S3, circumferentially winding composite fiber around the outer side of the mold and the position of the metal end frame axis, and filling the first anti-rotation and anti-slip groove during the composite fiber winding process;

[0050] Step S4, winding to the required outer diameter of the composite pressure shell and then putting it into a furnace for curing;

[0051] Step S5: After being taken out of the furnace, the contact portion between the composite material pressure-resistant casing port and the first anti-rotation and anti-slip groove is solidified to form a second anti-rotation and anti-slip groove;

[0052] Step S6: cutting off the wooden head and tearing off the release cloth, and the composite pressure-resistant shell is connected to the metal end frame.

[0053] Through the above design, this solution can more easily connect the composite pressure-resistant shell and the metal end frame.

[0054] Compared with the prior art, the present invention has the following beneficial effects:

[0055] The present invention has high connection reliability and will not cause fiber interruption of the composite pressure-resistant shell. It can well maintain the fiber continuity of the composite material, ensure the strength of the composite pressure-resistant shell, and reduce the risk of using the pressure-resistant shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the background technology or the technical solution of the present invention, the following is a brief introduction to the drawings used in conjunction with the prior art or specific implementation methods; obviously, the structures, proportions, sizes, etc. depicted in the drawings of the specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which the present invention can be implemented. Therefore, they have no technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed in the present invention without affecting the efficacy and purpose that can be achieved by the present invention.

[0057] Figure 1 This is a structural diagram of Example 1 of the specific implementation method of the present invention.

[0058] Figure 2 This is a schematic cross-sectional view taken along the A-A line of Example 1 of a specific embodiment of the present invention.

[0059] Figure 3 This is a structural diagram of Example 2 of a specific implementation method of the present invention.

[0060] Figure 4 This is a schematic cross-sectional view of Example 2B-B of a specific embodiment of the present invention.

[0061] Figure 5 This is a structural diagram of Example 3 of the specific implementation method of the present invention.

[0062] Figure 6 This is a schematic diagram of Example 3C of a specific implementation method of the present invention.

[0063] Figure 7 This is a structural diagram of Example 4 of the specific implementation method of the present invention.

[0064] Figure 8 A schematic diagram is formed for Example 4 of the specific implementation method of the present invention.

[0065] As shown in the figure: 1-metal end frame; 2-composite pressure-resistant shell; 21-inner flange; 3-connecting flange; 4-screw; 5-step anti-rotation groove; 6-step anti-rotation boss; 7-key; 8-anti-rotation groove; 9-anti-rotation boss; 10-first anti-rotation groove; 11-second anti-rotation groove; 12-connecting plate; 13-anti-slip boss; 14-first anti-rotation and anti-slip groove; 15-second anti-rotation and anti-slip groove; 16-mold; 161-mold center axis; 17-wooden head; 18-first layer of composite fiber; 181-second layer of composite fiber. DETAILED DESCRIPTION

[0066] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative work should fall within the scope of protection of the present invention.

[0067] At the same time, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like cited in this specification to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. Changes or adjustments to their relative relationships should also be regarded as the scope of the present invention without substantially changing the technical content.

[0068] At the same time, in the description of this specification, it should be noted that, unless otherwise clearly stipulated and limited, the terms "install", "connect", and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a connection between the two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood based on specific circumstances.

[0069] Currently, the connection between the composite pressure hull and metal components is mainly achieved through bolting and adhesive bonding. However, directly connecting the composite pressure hull and metal components through bolting will cause the interruption of fibers in the composite pressure hull. When subjected to force, the connection parts are prone to stress concentration. During long-term use under high external pressure, there is a risk of damage to the pressure hull. Adhesive bonding is greatly affected by the thickness of the adhesive layer and the environment. If used alone, it is difficult to ensure the reliability of the connection.

[0070] Therefore, the design concept of this scheme is to abandon the simple bolt connection and adhesive connection between the composite pressure hull and the metal parts, and design a new connection structure to improve the connection reliability of the connection structure without causing fiber interruption of the composite pressure hull. It can well maintain the fiber continuity of the composite material, ensure the strength of the composite pressure hull, and reduce the risk of using the pressure hull.

[0071] Example 1

[0072] like Figure 1 and 2 As shown, the present invention provides a high-reliability connection structure for a composite pressure-resistant shell, which adopts an anti-rotation and anti-detachment structure to improve the reliability of the connection structure between the composite pressure-resistant shell and the metal end frame, including:

[0073] A metal end frame 1, one end of which is provided with a first anti-rotation structure;

[0074] A composite pressure hull 2, wherein a port of the composite pressure hull 2 ​​is provided with a second anti-rotation structure, and the composite pressure hull 2 ​​and the metal end frame 1 are connected to the first anti-rotation structure via the second anti-rotation structure;

[0075] An adhesive layer is provided between the contact surface of the metal end frame 1 and the composite pressure-resistant shell 2 (the main component of the adhesive layer is structural adhesive);

[0076] The shaft head of the metal end frame 1 is connected with an anti-slip device, and the anti-slip device is in contact connection with the composite pressure-resistant shell 2 .

[0077] The wall thickness of the composite pressure-resistant shell 2 is less than 10 mm, the first anti-rotation structure is a stepped anti-rotation groove 5 provided at the axial position of the metal end frame 1, and the second anti-rotation structure is a stepped anti-rotation boss 6 provided on the inner wall of the inner flange 21 of the composite pressure-resistant shell 2, and the stepped anti-rotation boss 6 is plugged into the stepped anti-rotation groove 5;

[0078] A keyway is provided on the inner side of the stepped anti-rotation boss 6, and a key 7 is installed in the keyway;

[0079] The anti-slip device is a connecting flange 3 , which is connected to the shaft head of the metal end frame 1 through screws 4 , and is also connected to the inner flange 21 of the composite pressure-resistant shell 2 in a contact manner.

[0080] The stepped anti-rotation groove 5 can also be replaced with grooves of other shapes, such as triangle, square, etc. The groove depth is generally one-fifth of the wall thickness of the composite component, and the area is determined by the diameter of the composite component.

[0081] The connection method of the connection structure is a high-reliability connection method for a composite pressure-resistant shell, comprising the following steps:

[0082] Step S1, pre-arranging a first anti-rotation structure on the metal end frame 1;

[0083] Step S2, pre-arranging a second anti-rotation structure on the composite pressure hull 2 ​​to cooperate with the first anti-rotation structure;

[0084] Step S3, grinding the bonding surface of the composite pressure-resistant shell 2 into a rough surface and cleaning the rough surface (wiping the rough surface with ethyl acetate to ensure bonding reliability);

[0085] Step S4, sandblasting the bonding surface of the metal end frame 1 into a sandblasted surface, cleaning the sandblasted surface (wiping the sandblasted surface with ethyl acetate), and applying structural adhesive;

[0086] Among them, the sealing surface and other non-bonding surfaces of the metal parts are protected with tape and then sandblasted. After sandblasting, high-pressure air is used to blow away the floating sand, and the sandblasted surface is wiped clean with ethyl acetate. It is worth noting that after the sandblasting treatment of the bonding surface of the metal end frame 1, the bonding surface of the composite pressure-resistant shell 2 and the bonding surface of the metal end frame 1 must be completed within 24 hours. If the connection is not matched after 24 hours, the bonding surface of the metal end frame 1 must be sandblasted again;

[0087] The structural adhesive layer should be evenly applied, and a marine corrosion-resistant and high-toughness structural adhesive should be used. After the metal end frame 1 and the composite pressure hull 2 ​​are matched and bonded, they are placed on a special bonding tool. The bonding tool should be kept parallel to ensure the parallelism of the two ends of the bonding metal end frame 1 and the composite pressure hull 2.

[0088] Step S5, bonding the bonding surface of the composite pressure-resistant casing 2 to the bonding surface of the metal end frame 1, at which point the first anti-rotation structure and the second anti-rotation structure are matched and connected;

[0089] Step S6, heating the matched metal end frame 1 and the composite pressure-resistant shell 2 to 40° C. and curing them for 4 hours;

[0090] Step S7: After being taken out of the furnace, the anti-slip device is connected to the metal end frame 1 by screws 4, and is also connected to the inner flange 21 of the composite pressure-resistant shell 2 by abutting contact;

[0091] In step S8, the metal end frame 1 and the composite pressure hull 2 ​​are heated again at 40° C. and cured for 4 hours, thereby completing the connection between the metal end frame 1 and the composite pressure hull 2 ​​.

[0092] The wall thickness of the composite pressure-resistant shell 2 is less than 10 mm. The first anti-rotation structure in step S1 is a stepped anti-rotation groove 5 provided at the axial position of the metal end frame 1. The second anti-rotation structure in step S2 is a stepped anti-rotation boss 6 provided on the inner wall of the inner flange 21 of the composite pressure-resistant shell 2. The stepped anti-rotation boss 6 is plugged into the stepped anti-rotation groove 5.

[0093] A keyway is provided on the inner side of the stepped anti-rotation boss 6, and a key 7 is installed in the keyway;

[0094] The anti-dropping device in step S7 is a connecting flange 3 , which is connected to the shaft head of the metal end frame 1 via screws 4 , and is also connected to the inner flange 21 of the composite pressure hull 2 ​​in abutting manner.

[0095] Among them, in step S7, the anti-slip device is installed on the metal end frame 1 by screws 4 and glue; the function of the anti-slip device is to prevent the composite pressure-resistant shell and the metal end frame from falling off under high-pressure use conditions. The anti-slip device is connected to the metal end frame 1 by screws to avoid damaging the composite pressure-resistant shell 2 and causing damage to the strength of the composite pressure-resistant shell 2. The screw connection plus glue connection method better ensures the reliability of the connection.

[0096] Example 2

[0097] like Figure 3 and 4 As shown, the present invention provides a high-reliability connection structure for a composite pressure-resistant shell, which adopts an anti-rotation and anti-detachment structure to improve the reliability of the connection structure between the composite pressure-resistant shell and the metal end frame, including:

[0098] A metal end frame 1, one end of which is provided with a first anti-rotation structure;

[0099] A composite pressure hull 2, wherein a port of the composite pressure hull 2 ​​is provided with a second anti-rotation structure, and the composite pressure hull 2 ​​and the metal end frame 1 are connected to the first anti-rotation structure via the second anti-rotation structure;

[0100] An adhesive layer is provided between the contact surface of the metal end frame 1 and the composite pressure-resistant shell 2;

[0101] The shaft head of the metal end frame 1 is connected with an anti-slip device, and the anti-slip device is in contact connection with the composite pressure-resistant shell 2 .

[0102] The wall thickness of the composite pressure-resistant shell 2 is greater than 10 mm, the first anti-rotation structure is an anti-rotation groove 8 provided at the ring position of the metal end frame 1, and the second anti-rotation structure is an anti-rotation boss 9 provided on the end of the composite pressure-resistant shell 2, and the anti-rotation boss 9 is plugged into the anti-rotation groove 8;

[0103] The anti-slip device is a connecting flange 3 , which is connected to the shaft head of the metal end frame 1 , and is also in contact with the inner flange 21 of the composite pressure-resistant shell 2 .

[0104] The anti-rotation groove 8 may be in the shape of a triangle, a square, or the like.

[0105] The connection method of the connection structure is a high-reliability connection method for a composite pressure-resistant shell, comprising the following steps:

[0106] Step S1, pre-arranging a first anti-rotation structure on the metal end frame 1;

[0107] Step S2, pre-arranging a second anti-rotation structure on the composite pressure hull 2 ​​to cooperate with the first anti-rotation structure;

[0108] Step S3, grinding the bonding surface of the composite pressure-resistant shell 2 into a rough surface and cleaning the rough surface (wiping the rough surface with ethyl acetate to ensure bonding reliability);

[0109] Step S4, sandblasting the bonding surface of the metal end frame 1 into a sandblasted surface, cleaning the sandblasted surface (wiping the sandblasted surface with ethyl acetate), and applying structural adhesive;

[0110] Among them, the sealing surface and other non-bonding surfaces of the metal parts are protected with tape and then sandblasted. After sandblasting, high-pressure air is used to blow away the floating sand, and the sandblasted surface is wiped clean with ethyl acetate. It is worth noting that after the sandblasting treatment of the bonding surface of the metal end frame 1, the bonding surface of the composite pressure-resistant shell 2 and the bonding surface of the metal end frame 1 must be completed within 24 hours. If the connection is not matched after 24 hours, the bonding surface of the metal end frame 1 must be sandblasted again;

[0111] The structural adhesive layer should be evenly applied, and a marine corrosion-resistant and high-toughness structural adhesive should be used. After the metal end frame 1 and the composite pressure hull 2 ​​are matched and bonded, they are placed on a special bonding tool. The bonding tool should be kept parallel to ensure the parallelism of the two ends of the bonding metal end frame 1 and the composite pressure hull 2.

[0112] Step S5, bonding the bonding surface of the composite pressure-resistant casing 2 to the bonding surface of the metal end frame 1, at which point the first anti-rotation structure and the second anti-rotation structure are matched and connected;

[0113] Step S6, heating the matched metal end frame 1 and the composite pressure-resistant shell 2 to 40° C. and curing them for 4 hours;

[0114] Step S7: After being taken out of the furnace, the anti-slip device is connected to the metal end frame 1 by screws 4, and is also connected to the inner flange 21 of the composite pressure-resistant shell 2 by abutting contact;

[0115] In step S8, the metal end frame 1 and the composite pressure hull 2 ​​are heated again at 40° C. and cured for 4 hours, thereby completing the connection between the metal end frame 1 and the composite pressure hull 2 ​​.

[0116] The wall thickness of the composite pressure-resistant shell 2 is greater than 10 mm, the first anti-rotation structure in step S1 is an anti-rotation groove 8 provided at the ring position of the metal end frame 1, and the second anti-rotation structure in step S2 is an anti-rotation boss 9 provided on the end of the composite pressure-resistant shell 2, the anti-rotation boss 9 is plugged into the anti-rotation groove 8, wherein the groove shape of the anti-rotation groove 8 is adapted to the shape of the anti-rotation boss 9, and preferably they are approximately the same, which is more conducive to the close combination of the two;

[0117] The anti-slip device in step S7 is a connecting flange 3 , which is connected to the shaft head of the metal end frame 1 and is in contact with the inner flange 21 of the composite pressure-resistant shell 2 .

[0118] Among them, in step S7, the anti-slip device is installed on the metal end frame 1 by screws 4 and glue; the function of the anti-slip device is to prevent the composite pressure-resistant shell and the metal end frame from falling off under high-pressure use conditions. The anti-slip device is connected to the metal end frame 1 by screws to avoid damaging the composite pressure-resistant shell 2 and causing damage to the strength of the composite pressure-resistant shell 2. The screw connection plus glue connection method better ensures the reliability of the connection.

[0119] Example 3

[0120] like Figure 5 and 6 As shown, the present invention provides a high-reliability connection structure for a composite pressure-resistant shell, which adopts an anti-rotation and anti-detachment structure to improve the reliability of the connection structure between the composite pressure-resistant shell and the metal end frame, including:

[0121] A metal end frame 1, one end of which is provided with a first anti-rotation structure;

[0122] A composite pressure hull 2, wherein a port of the composite pressure hull 2 ​​is provided with a second anti-rotation structure, and the composite pressure hull 2 ​​and the metal end frame 1 are connected to the first anti-rotation structure via the second anti-rotation structure;

[0123] An adhesive layer is provided between the contact surface of the metal end frame 1 and the composite pressure-resistant shell 2;

[0124] The shaft head of the metal end frame 1 is connected with an anti-slip device, and the anti-slip device is in contact connection with the composite pressure-resistant shell 2 .

[0125] The composite pressure-resistant shell 2 has a diameter greater than 500 mm and a wall thickness greater than 30 mm. The first anti-rotation structure is a first anti-rotation groove 10 provided at the edge of the shaft head of the metal end frame 1. The second anti-rotation structure is a second anti-rotation groove 11 provided on the inner flange 21 of the composite pressure-resistant shell 2.

[0126] The anti-slip device includes a connecting plate 12, and an anti-slip boss 13 is provided on the connecting plate 12;

[0127] The first anti-rotation groove 10 and the second anti-rotation groove 11 are aligned to form a coupling groove, the anti-slip boss 13 is plugged into the coupling groove, and the connecting plate 12 is connected to the shaft head of the metal end frame 1. The groove shape of the coupling groove is adapted to the shape of the anti-slip boss 13, and it is best to make them approximately the same, which is more conducive to the close combination of the two.

[0128] The groove shapes of the first anti-rotation groove 10 and the second anti-rotation groove 11 can be triangular, square, etc.

[0129] The connection method of the connection structure is a high-reliability connection method for a composite pressure-resistant shell, comprising the following steps:

[0130] Step S1, pre-arranging a first anti-rotation structure on the metal end frame 1;

[0131] Step S2, pre-arranging a second anti-rotation structure on the composite pressure hull 2 ​​to cooperate with the first anti-rotation structure;

[0132] Step S3, grinding the bonding surface of the composite pressure-resistant shell 2 into a rough surface and cleaning the rough surface (wiping the rough surface with ethyl acetate to ensure bonding reliability);

[0133] Step S4, sandblasting the bonding surface of the metal end frame 1 into a sandblasted surface, cleaning the sandblasted surface (wiping the sandblasted surface with ethyl acetate), and applying structural adhesive;

[0134] Among them, the sealing surface and other non-bonding surfaces of the metal parts are protected with tape and then sandblasted. After sandblasting, high-pressure air is used to blow away the floating sand, and the sandblasted surface is wiped clean with ethyl acetate. It is worth noting that after the sandblasting treatment of the bonding surface of the metal end frame 1, the bonding surface of the composite pressure-resistant shell 2 and the bonding surface of the metal end frame 1 must be completed within 24 hours. If the connection is not matched after 24 hours, the bonding surface of the metal end frame 1 must be sandblasted again;

[0135] The structural adhesive layer should be evenly applied, and a marine corrosion-resistant and high-toughness structural adhesive should be used. After the metal end frame 1 and the composite pressure hull 2 ​​are matched and bonded, they are placed on a special bonding tool. The bonding tool should be kept parallel to ensure the parallelism of the two ends of the bonding metal end frame 1 and the composite pressure hull 2.

[0136] Step S5, bonding the bonding surface of the composite pressure-resistant casing 2 to the bonding surface of the metal end frame 1, at which point the first anti-rotation structure and the second anti-rotation structure are matched and connected;

[0137] Step S6, heating the matched metal end frame 1 and the composite pressure-resistant shell 2 to 40° C. and curing them for 4 hours;

[0138] Step S7: After being taken out of the furnace, the anti-slip device is connected to the metal end frame 1 by screws 4, and is also connected to the inner flange 21 of the composite pressure-resistant shell 2 by abutting contact;

[0139] In step S8, the metal end frame 1 and the composite pressure hull 2 ​​are heated again at 40° C. and cured for 4 hours, thereby completing the connection between the metal end frame 1 and the composite pressure hull 2 ​​.

[0140] The composite pressure hull 2 ​​has a diameter greater than 500 mm and a wall thickness greater than 30 mm. The first anti-rotation structure in step S1 is a first anti-rotation groove 10 provided at the edge of the shaft head of the metal end frame 1. The second anti-rotation structure in step S2 is a second anti-rotation groove 11 provided on the inner flange 21 of the composite pressure hull 2.

[0141] The anti-slip device in step S7 includes a connecting plate 12, and an anti-slip boss 13 is provided on the connecting plate 12;

[0142] The first anti-rotation groove 10 and the second anti-rotation groove 11 are aligned to form a coupling groove, the anti-slip boss 13 is plugged into the coupling groove, and the connecting plate 12 is connected to the shaft head of the metal end frame 1 .

[0143] Among them, in step S7, the anti-slip device is installed on the metal end frame 1 by screws 4 and glue; the function of the anti-slip device is to prevent the composite pressure-resistant shell and the metal end frame from falling off under high-pressure use conditions. The anti-slip device is connected to the metal end frame 1 by screws to avoid damaging the composite pressure-resistant shell 2 and causing damage to the strength of the composite pressure-resistant shell 2. The screw connection plus glue connection method better ensures the reliability of the connection.

[0144] Example 4

[0145] like Figure 7 and 8 As shown, the present invention provides a high-reliability connection structure for a composite pressure-resistant shell, which directly forms a composite pressure-resistant shell 2 on a metal end frame 1 to form an anti-rotation and anti-detachment structure between them, thereby improving the reliability of the connection structure, including:

[0146] A metal end frame 1, wherein a first anti-rotation and anti-slip groove 14 is provided on the shaft head edge of the metal end frame 1;

[0147] The composite pressure-resistant shell 2 has a second anti-rotation and anti-slip groove 15 provided at its port, and the composite pressure-resistant shell 2 and the metal end frame 1 are connected to each other through the second anti-rotation and anti-slip groove 15 and the first anti-rotation and anti-slip groove 14 .

[0148] The connection method of the connection structure is a high-reliability connection method for a composite pressure-resistant shell, comprising the following steps:

[0149] Step S1, pre-arrange a first anti-rotation and anti-slip groove 14 on the axis of the metal end frame 1;

[0150] Step S2: Put the metal end frame 1 on the end of the mold 16, stick a release cloth on the end of the metal end frame 1, and then install the wooden head 17. At this time, the wooden head 17 is sleeved on the mold center axis 161;

[0151] Step S3: circumferentially winding composite fiber around the outside of the mold 16 and the axial position of the metal end frame 1. During the composite fiber winding process, the first anti-rotation and anti-slip groove 14 is filled and leveled.

[0152] Step S4, winding to the required outer diameter of the composite pressure-resistant shell 2 and then putting it into a furnace for curing;

[0153] Among them, composite fiber winding will be hoop-wound, for example Figure 8 The composite fiber layer 18 and the composite fiber second layer 181 are wound in such a manner that the user can decide how many layers to wrap according to his / her own needs.

[0154] Step S5: After being taken out of the furnace, the contact portion between the port of the composite pressure hull 2 ​​and the first anti-rotation and anti-slip groove 14 is solidified to form a second anti-rotation and anti-slip groove 15;

[0155] Step S6: cutting off the wooden head 17 and tearing off the release cloth, and the composite pressure-resistant shell 2 and the metal end frame 1 are connected.

[0156] The present invention relates to the field of connection between composite pressure hulls and other material components, and mainly solves the problem of connection reliability of composite pressure hulls under high external pressure conditions. The connection structure made by this method has high reliability and strong process feasibility.

[0157] The present invention prefabricates an anti-rotation device in the composite pressure-resistant shell to ensure that no circumferential relative movement occurs when the composite pressure-resistant shell is connected to the metal end frame; installs an anti-slip device in evenly distributed threaded holes on the metal end frame, and connects the metal end frame to the composite pressure-resistant shell through the anti-slip device to ensure that the metal end frame will not fall off during use of the composite pressure-resistant shell; and evenly applies marine corrosion-resistant structural adhesive at the connection between the composite material and the metal end frame to ensure that the composite pressure-resistant shell and the metal end frame are firmly connected under the action of external pressure.

[0158] The present invention solves the problem of connection reliability between the composite pressure-resistant shell and metal parts under deep-sea environment and high external pressure. In the present invention, the fiber layer in the composite pressure-resistant shell is not damaged, and the performance of the composite pressure-resistant shell is not affected. An anti-slip device and an anti-rotation structure are provided between the composite pressure-resistant shell and the metal parts to ensure the connection reliability of the composite pressure-resistant shell.

[0159] The beneficial effects of the present invention are:

[0160] 1. The lightweight nature of composite materials can greatly reduce the overall weight of the equipment, increase the equipment's range, and allow the equipment to carry more battery devices to extend the equipment's range. It can also carry more detection equipment;

[0161] 2. After the composite component is connected to the metal component, multiple connections can be made with other material components through the metal component, solving the connection problem between composite components and between composite components and other metal materials;

[0162] 3. The highly reliable connection method of the composite pressure hull ensures that the fibers of the composite material maintain continuity, and the strength of the composite pressure hull is guaranteed while ensuring reliable connection.

[0163] 4. This composite pressure-resistant shell has a high-reliability connection method and is equipped with an anti-slip device to improve the reliability of the connection structure;

[0164] 5. The high-reliability connection method of the composite pressure-resistant shell is provided with an anti-rotation structure to improve the connection reliability of the connection structure under high fatigue loads.

[0165] Although the present invention has been described in detail with reference to the accompanying drawings and in combination with preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, ordinary technicians in this field can make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions should all be within the scope of the present invention. Any technician familiar with this technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, and they should all be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A high reliability connection structure for a composite pressure hull, characterized in that: include, A metal end frame (1), wherein one end of the metal end frame (1) is provided with a first anti-rotation structure; A composite pressure-resistant shell (2), wherein a port of the composite pressure-resistant shell (2) is provided with a second anti-rotation structure, and the composite pressure-resistant shell (2) and the metal end frame (1) are connected to the first anti-rotation structure via the second anti-rotation structure; An adhesive layer is provided between the contact surface of the metal end frame (1) and the composite material pressure-resistant shell (2); The shaft head of the metal end frame (1) is connected to an anti-slip device, and the anti-slip device is in contact connection with the composite material pressure-resistant shell (2); When the wall thickness of the composite pressure-resistant shell (2) is less than 10 mm, the first anti-rotation structure is a stepped anti-rotation groove (5) provided at the axial position of the metal end frame (1), and the second anti-rotation structure is a stepped anti-rotation boss (6) provided on the inner wall of the inner flange (21) of the composite pressure-resistant shell (2), and the stepped anti-rotation boss (6) is plugged into the stepped anti-rotation groove (5); A keyway is provided on the inner side of the stepped anti-rotation boss (6), and a key (7) is installed in the keyway; The anti-slip device is a connecting flange (3), the connecting flange (3) is connected to the shaft head of the metal end frame (1), and the connecting flange (3) is in contact connection with the inner flange (21) of the composite material pressure-resistant shell (2); When the wall thickness of the composite pressure-resistant shell (2) is greater than 10 mm, the first anti-rotation structure is an anti-rotation groove (8) provided at the ring position of the metal end frame (1), and the second anti-rotation structure is an anti-rotation boss (9) provided on the end of the composite pressure-resistant shell (2), and the anti-rotation boss (9) is plugged into the anti-rotation groove (8); When the diameter of the composite pressure-resistant shell (2) is greater than 500 mm and the wall thickness is greater than 30 mm, the first anti-rotation structure is a first anti-rotation groove (10) provided at the edge of the shaft head of the metal end frame (1), and the second anti-rotation structure is a second anti-rotation groove (11) provided on the inner flange (21) of the composite pressure-resistant shell (2); The anti-slip device comprises a connecting plate (12), and an anti-slip boss (13) is provided on the connecting plate (12); The first anti-rotation groove (10) and the second anti-rotation groove (11) are aligned to form a coupling groove, the anti-slip boss (13) is plugged into the coupling groove, and the connecting plate (12) is connected to the shaft head of the metal end frame (1).

2. A high reliability connection method for composite pressure hull, characterized in that: The following steps are included: Step S1, pre-arranging a first anti-rotation structure on the metal end frame (1); Step S2, pre-arranging a second anti-rotation structure that cooperates with the first anti-rotation structure on the composite pressure-resistant shell (2); Step S3, grinding the bonding surface of the composite pressure-resistant shell (2) into a rough surface and cleaning the rough surface; Step S4, sandblasting the bonding surface of the metal end frame (1) into a sandblasted surface, cleaning the sandblasted surface, and applying structural adhesive; Step S5, bonding the bonding surface of the composite pressure-resistant casing (2) to the bonding surface of the metal end frame (1), at which point the first anti-rotation structure and the second anti-rotation structure are matched and connected; Step S6, heating and curing the matched and connected metal end frame 1 and the composite pressure-resistant shell (2); Step S7, after being taken out of the furnace, the anti-slip device is connected to the metal end frame (1), and is also connected to the inner flange (21) of the composite pressure-resistant shell (2) in a contact manner; Step S8, heating and curing the metal end frame (1) and the composite pressure-resistant shell (2) again, and completing the connection between the metal end frame (1) and the composite pressure-resistant shell (2); The wall thickness of the composite pressure-resistant shell (2) is less than 10 mm, the first anti-rotation structure in step S1 is a stepped anti-rotation groove (5) provided at the axial position of the metal end frame (1), and the second anti-rotation structure in step S2 is a stepped anti-rotation boss (6) provided on the inner wall of the inner flange (21) of the composite pressure-resistant shell (2), and the stepped anti-rotation boss (6) is plugged into the stepped anti-rotation groove (5); The anti-slip device in step S7 is a connecting flange (3), the connecting flange (3) is connected to the shaft head of the metal end frame (1), and the connecting flange (3) is in contact connection with the inner flange (21) of the composite pressure-resistant shell (2); The wall thickness of the composite pressure-resistant shell (2) is greater than 10 mm, the first anti-rotation structure in step S1 is an anti-rotation groove (8) provided at the ring position of the metal end frame (1), and the second anti-rotation structure in step S2 is an anti-rotation boss (9) provided on the end of the composite pressure-resistant shell (2), and the anti-rotation boss (9) is plugged into the anti-rotation groove (8); The composite pressure-resistant shell (2) has a diameter greater than 500 mm and a wall thickness greater than 30 mm. The first anti-rotation structure in step S1 is a first anti-rotation groove (10) provided at the edge of the shaft head of the metal end frame (1). The second anti-rotation structure in step S2 is a second anti-rotation groove (11) provided on the inner flange (21) of the composite pressure-resistant shell (2). The anti-slip device in step S7 comprises a connecting plate (12), and an anti-slip boss (13) is provided on the connecting plate (12).

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