Sealing connection structure and method for composite pressure-resistant shell

Abstract

The invention discloses a sealing connection structure and a connection method for a composite pressure-resistant shell, which are applied to the technical field of sealing connection structures of pressure-resistant shells, and the key points of the technical scheme are that the sealing connection structure comprises a pressure-resistant shell and a flange plate connected to the end part of the pressure-resistant shell; a sealing ring is arranged between the flange plate and the pressure-resistant shell, locking connection is achieved between the outer surface of the pressure-resistant shell and the flange plate based on a buckle locking assembly, and a supporting ring is coaxially and fixedly connected into the pressure-resistant shell. A plurality of magnetic adsorption assemblies used for applying magnetic attraction force to the flange plate are slidably connected to the supporting ring in the circumferential direction, and the magnetic adsorption assemblies are slidably connected to the supporting ring in the inclined direction based on a sliding adjusting assembly. The sealing device has the technical effects of simple structure and good sealing effect.

Description

Technical Field

[0001] The present invention relates to the technical field of sealing connection structures for pressure-resistant shells, and particularly relates to a sealing connection structure and a connection method for a composite material pressure-resistant shell. Background Art

[0002] Since the advent of fiber-reinforced resin-based composite materials, their excellent properties have been favored by various industries and are widely used in fields such as national defense and military, aerospace, information technology, energy engineering, ship and ocean engineering. Compared with steel materials, composite materials have a series of advantages such as light weight, high specific strength, good impact resistance, good fatigue resistance, non-magnetic, as well as excellent sound / dielectric properties, high temperature resistance, and shock absorption. Composite material ships are one of the most important applications of composite materials in the field of ship and ocean engineering. Currently, it is a common installation and connection method to connect a composite material shell and a metal flange to form a pressure-resistant shell of a separate compartment, and then cooperate and connect with other compartments through the metal flange.

[0003] Currently, Chinese invention with the publication number of CN116838793A discloses a sealing connection structure and a connection method for a composite material pressure-resistant shell and a metal flange, including a composite material pressure-resistant shell and a metal flange. An annular flange is provided at the end of the composite material pressure-resistant shell, and an annular groove is provided at the end of the metal flange. The annular flange is inserted into the annular groove, and the area where the annular flange contacts the annular groove is bonded with an adhesive. A plurality of fasteners are arranged at intervals along the circumferential direction of the metal flange in the insertion area of the annular flange and the annular groove; a sealing ring is filled between the bottom of the annular groove and the annular flange, and a sealant is filled in the gap formed by the bottom of the annular groove, the annular flange, and the sealing ring. The existing invention installs the metal flange on the pressure-resistant shell by setting an annular flange at the end of the composite material pressure-resistant shell and an annular groove at the end of the metal flange, and inserting the annular flange into the annular groove and using fasteners to fix it. However, on the one hand, the load-bearing capacity of the annular flange part will be lower than that of the pressure-resistant shell, resulting in a reduction in the bearing capacity of the connection part between the pressure-resistant shell and the metal flange, thus affecting the load-bearing capacity of the pressure-resistant shell; on the other hand, using fasteners for fixation requires drilling holes in the pressure-resistant shell, which causes the fibers of the composite material here to be cut off, generating stress concentration points and weak points in the structural strength, affecting the safety and reliability of the structure, and there is a need for improvement. Summary of the Invention

[0004] The first object of the present invention is to provide a sealing connection structure for a composite material pressure-resistant shell, and its advantage is simple structure and good sealing effect.

[0005] The above technical object of the present invention is achieved by the following technical solutions: A sealing connection structure for a pressure-resistant housing of a composite material, comprising a pressure-resistant housing and a flange connected to the end of the pressure-resistant housing; a sealing ring is provided between the flange and the pressure-resistant housing, and a locking connection is achieved between the outer surface of the pressure-resistant housing and the flange based on a snap locking assembly. A support ring is fixedly connected coaxially inside the pressure-resistant housing, and a plurality of magnetic adsorption assemblies for applying magnetic suction force to the flange are slidably connected along the circumferential direction on the support ring. The magnetic adsorption assemblies are slidably connected to the support ring along an inclined direction based on a sliding adjustment assembly to adjust the magnitude of the magnetic suction force between the flange and the magnetic adsorption assemblies.

[0006] The present invention is further configured as follows: The flange includes a connection portion coaxially connected to the pressure-resistant housing and a flange mounting portion coaxially and fixedly connected to the connection portion. A plurality of flange holes are provided on the flange mounting portion. The connection portion includes an outer fitting portion, an inner fitting portion, and an end face fitting portion that are respectively fitted to the outer surface, inner surface, and end face of the pressure-resistant housing. The end face fitting portion extends in a direction away from the outer fitting portion to be provided with an end magnetic adsorption portion. The flange is made of steel material and is coated with an anti-corrosion coating on the outside.

[0007] The present invention is further configured as follows: The diameter of the flange mounting portion is smaller than the diameter of the outer fitting portion of the connection portion and larger than the diameter of the inner fitting portion, and a stepped structure is formed between the connection portion and the flange mounting portion.

[0008] The present invention is further configured as follows: The snap locking assembly includes a plurality of card teeth fixedly connected at equal intervals along the circumferential direction on the outer fitting portion and a plurality of cards adhered and fixedly connected at equal intervals along the circumferential direction on the pressure-resistant housing. A card slot is provided on the card, and a card connection assembly for card-connecting and fixedly connecting the card teeth in the card slot is movably connected in the card slot.

[0009] The present invention is further configured as follows: The card connection assembly includes a movable slot opened in the card along a direction perpendicular to the central plane of the pressure-resistant housing and a card connection block slidably connected in the movable slot for card-connecting the card teeth. The card connection block is connected to the card based on a card connection spring.

[0010] The present invention is further configured such that: the cross-section of the support ring is triangular and the inner diameter of the support ring gradually increases in the direction towards the flange. The magnetic adsorption assembly includes an arc-shaped mounting block slidably connected in the support ring along a direction parallel to the axis of the pressure-resistant housing. The thickness of the arc-shaped mounting block gradually increases in the direction towards the flange. A plurality of strong magnets are uniformly fixed on the end face of the arc-shaped mounting block that fits with the support ring and on the end face of the arc-shaped mounting block close to the flange. The strong magnets on the end face of the arc-shaped mounting block that fits with the support ring are arranged parallel to the outer fitting portion, and the strong magnets on the end face of the arc-shaped mounting block close to the flange are arranged parallel to the end magnetic adsorption portion.

[0011] The present invention is further configured such that: the sliding adjustment assembly includes a sliding screw rod rotatably connected in the support ring with its axis along a direction parallel to the sliding direction of the arc-shaped mounting block, and a sliding drive motor fixed to the support ring for driving the sliding screw rod to rotate. A screw sliding hole cooperating with the sliding screw rod is provided on the arc-shaped mounting block.

[0012] The present invention is further configured such that: at the end of the inner wall of the pressure-resistant housing close to the flange, there is a pressure detection assembly. The pressure detection assembly includes a detection seat adhesively and fixedly connected to the pressure-resistant housing and a detection groove provided on the detection seat. A detection rod abutting against the flange is slidably connected in the detection groove, and a pressure sensor is fixedly connected to the bottom of the detection groove.

[0013] The present invention is further configured such that: the strong magnets use neodymium magnets, the sliding drive motor uses a servo motor, and the sliding screw rod, the support ring, and the arc-shaped mounting block are all made of hard plastic material.

[0014] The second object of the present invention is to provide a sealing connection method for a composite material pressure-resistant housing, which has the advantages of simple structure and good sealing effect.

[0015] The above technical object of the present invention is achieved through the following technical solutions: a sealing connection method for a composite material pressure-resistant housing, applying a sealing connection structure for a composite material pressure-resistant housing as described in any one of the above technical solutions; including: Step 1: Grind the end of the pressure-resistant housing, and install the support ring, the magnetic adsorption assembly, and the sliding adjustment assembly inside the pressure-resistant housing. Step 2: Sleeve and connect the sealing ring to the end of the pressure-resistant housing, and then sleeve and install the flange on the pressure-resistant housing until the end of the flange abuts against the end of the pressure-resistant housing. After installation, the flange is locked on the pressure-resistant housing through the buckle locking assembly. Step 3: Connect the pressure-resistant housing after installation through a flange. When entering deep water, the water pressure acts on the flange to press the pressure-resistant housing downward, the sealing ring is compressed, and a magnetic suction force is applied to the flange through the magnetic suction assembly to increase the compression degree of the sealing ring, thereby improving the sealing effect. The magnetic suction assembly is driven by the sliding adjustment assembly to move, so as to adjust the magnitude and position of the magnetic suction force.

[0016] In summary, the present invention has the following beneficial effects: 1. By setting a sealing ring between the pressure-resistant housing and the flange and realizing the locking connection between the pressure-resistant housing and the flange based on the buckle locking assembly, and setting a magnetic suction assembly and a sliding adjustment assembly for adjusting the position of the magnetic suction assembly in the pressure-resistant housing. When installing, the flange is sleeved and installed at the end of the pressure-resistant housing, and a sealing ring is set between the pressure-resistant housing and the flange. The buckle locking assembly restricts the movement of the flange on the pressure-resistant housing along the axial direction. At the same time, the magnetic suction assembly is provided with an arc-shaped mounting block, and a number of strong magnets are evenly fixed on the end face where the arc-shaped mounting block fits with the support ring and the end face of the arc-shaped mounting block close to the flange. The strong magnets generate a magnetic suction force on the outer fitting part and the end magnetic suction part of the flange, thereby generating a circumferential tension along the direction perpendicular to the axial line and an axial tension along the direction parallel to the axial line on the flange, so that the sealing ring is compressed, initially ensuring the sealing connection effect between the pressure-resistant housing and the flange. When the pressure-resistant housing enters the deep sea, since the water pressure acts evenly on the flange, the water pressure acts on the flange to press the pressure-resistant housing downward, and the sealing ring is further compressed. At the same time, because the magnetic suction assembly is slidably connected to the support ring along the inclined direction based on the sliding adjustment assembly, when the sliding adjustment assembly drives the magnetic suction assembly to slide along the inclined direction, the magnetic suction force increases due to the reduction of the distance between the magnetic suction assembly and the outer fitting part and the end magnetic suction part of the flange, thereby further increasing the sealing effect between the flange and the pressure-resistant housing, avoiding punching holes in the pressure-resistant housing, ensuring the bearing capacity of the connection part between the pressure-resistant housing and the flange, avoiding affecting the safety and reliability of the structure, and improving the sealing effect; 2. The flange is set to include a connection part and a flange installation part, and the diameter of the flange installation part is smaller than the outer fitting part of the connection part and larger than the inner fitting part. There is a stepped structure between the connection part and the flange installation part. When entering deep water, the part between the connection part and the flange installation part will be affected by the water pressure to generate an inward acting force along the axial direction on the flange, which can further improve the sealing effect and avoid the possibility of loss of axial sealing effect caused by the failure of the sliding adjustment assembly and the magnetic suction assembly; 3. By providing a pressure detection component at the end of the inner wall of the pressure-resistant housing near the flange, the pressure detection component can detect the acting force of the flange on the end of the pressure-resistant housing, thereby controlling the slip adjustment component to adjust the position of the magnetic adsorption component, so as to achieve intelligent regulation of the sealing effect according to the water depth, and increase the sealing effect in deep water to improve the safety effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the overall structural sectional view of this embodiment; Figure 2 is Figure 1 the enlarged schematic view of part A of Figure 3 is Figure 1 the enlarged schematic view of part B of Figure 4 is Figure 1 the enlarged schematic view of part C of

[0018] Reference Signs: 1, pressure-resistant housing; 2, flange; 21, connecting part; 211, outer fitting part; 212, inner fitting part; 213, end face fitting part; 214, end magnetic adsorption part; 22, flange mounting part; 23, flange hole; 3, sealing ring; 4, buckle locking component; 41, card rack; 42, card block; 43, card slot; 44, card connection component; 441, movable slot; 442, card connection block; 443, card connection spring; 5, support ring; 6, magnetic adsorption component; 61, arc-shaped mounting block; 62, strong magnet; 7, slip adjustment component; 71, slip lead screw; 72, slip drive motor; 73, lead screw slip hole; 8, pressure detection component; 81, detection seat; 82, detection slot; 83, detection rod; 84, pressure sensor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The present invention will be further described in detail below with reference to the accompanying drawings.

[0020] Embodiment 1: Refer to Figures 1 to 4, A sealing connection structure for a composite pressure-resistant housing 1, comprising a pressure-resistant housing 1 and a flange 2 connected to the end of the pressure-resistant housing 1. A sealing ring 3 is provided between the flange 2 and the pressure-resistant housing 1. The sealing ring 3 is made of fluororubber, which can have sufficient supporting force while ensuring the sealing and waterproof effect, so as to meet the requirements of higher sealing. A locking connection is achieved between the outer surface of the pressure-resistant housing 1 and the flange 2 based on a snap locking component 4. Through the snap locking component 4, the preliminary fixation between the pressure-resistant housing 1 and the flange 2 is realized, and at the same time, it is ensured that there is a small movement space between the pressure-resistant housing 1 and the flange 2 for the sealing ring 3 to be compressed. A support ring 5 is fixedly connected coaxially inside the pressure-resistant housing 1. Along the circumferential direction, a number of magnetic adsorption components 6 for applying magnetic suction force to the flange 2 are slidably connected to the support ring 5. The magnetic adsorption components 6 are slidably connected to the support ring 5 along an inclined direction based on a sliding adjustment component 7 to adjust the magnitude of the magnetic suction force between the flange 2 and the magnetic adsorption components 6. The support ring 5 provides a sliding channel for the magnetic adsorption components 6 and can also support the inner wall of the pressure-resistant housing 1, improving the pressure-resistant effect at the end of the pressure-resistant housing 1.

[0021] Reference Figure 1 , Specifically, the flange 2 includes a connection part 21 coaxially connected to the pressure-resistant housing 1 and a flange mounting part 22 coaxially and fixedly connected to the connection part 21. A number of flange holes 23 are provided on the flange mounting part 22. The connection part 21 includes an outer fitting part 211, an inner fitting part 212, and an end face fitting part 213 that are respectively attached to the outer surface, inner surface, and end face of the pressure-resistant housing 1. The end face fitting part 213 extends away from the outer fitting part 211 and is provided with an end magnetic adsorption part 214. The flange 2 is made of steel and is coated with an anti-corrosion coating on the outside, so that the flange 2 can be adsorbed by the magnetic adsorption components 6. By coating the anti-corrosion coating on the outside of the flange 2, the corrosion of the flange 2 by seawater can be avoided. The diameter of the flange mounting part 22 is smaller than the diameter of the outer fitting part 211 of the connection part 21 and larger than the diameter of the inner fitting part 212. A stepped structure is formed between the connection part 21 and the flange mounting part 22. When entering deep water, the part between the connection part 21 and the flange mounting part 22 will be affected by water pressure and generate an inward acting force along the axis direction on the flange 2. While further improving the sealing effect, it can avoid the possibility of loss of axial sealing effect caused by the failure of the sliding adjustment component 7 and the magnetic adsorption components 6. Combined with the snap locking component 4, it is ensured that the flange 2 can always be fixed on the pressure-resistant housing 1 in the deep sea and sufficient sealing effect is guaranteed.

[0022] Reference Figure 1 and Figure 2, specifically, the buckle locking assembly 4 includes a number of rack teeth 41 fixedly connected to the outer fitting portion 211 at equal intervals along the circumferential direction and a number of blocks 42 adhesively and fixedly connected to the pressure-resistant housing 1 at equal intervals along the circumferential direction. A number of clamping grooves in the shape of right triangles are provided on the rack teeth 41. The shape of the block 42 is the same as the clamping shape. A clamping groove 43 is formed in the block 42. A clamping assembly 44 for clamping and fixedly connecting the rack teeth 41 in the clamping groove 43 is movably connected in the clamping groove 43. The clamping assembly 44 includes a movable groove 441 formed in the block 42 along the direction perpendicular to the central plane of the pressure-resistant housing 1 and a clamping block 442 slidably connected in the movable groove 441 for clamping the rack teeth 41. The clamping block 442 is connected to the block 42 based on a clamping spring 443. When the rack teeth 41 are inserted into the clamping groove 43, since the clamping surfaces of the clamping grooves and the block 42 are inclined, the rack teeth 41 can be smoothly inserted into the clamping groove 43. After the rack teeth 41 are inserted, the clamping block 442 enters the clamping groove to prevent the rack teeth 41 from moving outwards, thereby realizing the clamping between the pressure-resistant housing 1 and the flange 2. And this clamping relationship cannot achieve the complete fixation between the pressure-resistant housing 1 and the flange 2, so that the flange 2 can still move within a small range on the pressure-resistant housing 1 after clamping, thereby realizing the compression seal of the sealing ring 3.

[0023] Reference Figure 1 and Figure 3 , specifically, the cross-section of the support ring 5 is triangular and the inner diameter of the support ring 5 gradually increases along the direction towards the flange 2. The magnetic adsorption assembly 6 includes an arc-shaped mounting block 61 slidably connected in the support ring 5 along the direction parallel to the axis of the pressure-resistant housing 1. The thickness of the arc-shaped mounting block 61 gradually increases along the direction towards the flange 2. A number of strong magnets 62 are uniformly fixed on the end face where the arc-shaped mounting block 61 fits with the support ring 5 and on the end face of the arc-shaped mounting block 61 close to the flange 2. The strong magnets 62 on the end face where the arc-shaped mounting block 61 fits with the support ring 5 are arranged parallel to the outer fitting portion 211, and the strong magnets 62 on the end face of the arc-shaped mounting block 61 close to the flange 2 are arranged parallel to the end magnetic adsorption portion 214. Through the strong magnets 62, a magnetic suction force is generated on the outer fitting portion 211 and the end magnetic adsorption portion 214 of the flange 2, so as to generate a circumferential tensile force along the direction perpendicular to the axis and an axial tensile force along the direction parallel to the axis on the flange 2, thereby compressing the sealing ring 3 and initially ensuring the sealing connection effect between the pressure-resistant housing 1 and the flange 2.

[0024] Reference Figure 1 and Figure 3, Specifically, the sliding adjustment assembly 7 includes a sliding lead screw 71 whose axis is rotatably connected in the support ring 5 along the sliding direction parallel to the arc-shaped mounting block 61, and a sliding drive motor 72 fixedly connected to the support ring 5 for driving the sliding lead screw 71 to rotate. A lead screw sliding hole 73 matching the sliding lead screw 71 is provided on the arc-shaped mounting block 61. By driving the sliding lead screw 71 to rotate through the sliding drive motor 72, the arc-shaped mounting block 61 is driven to displace in the support ring 5 in the direction inclined relative to the axis of the pressure-resistant housing 1. The included angle between the displacement direction and the axis direction of the pressure-resistant housing 1 is between 10 and 15 degrees. In this embodiment, the strong magnet 62 uses a neodymium magnet to provide sufficient magnetic attraction force. The sliding drive motor 72 uses a servo motor to ensure the adjustment accuracy of the sliding adjustment assembly 7. The sliding lead screw 71, the support ring 5, and the arc-shaped mounting block 61 are all made of hard plastic material to avoid affecting the magnetic adsorption assembly 6.

[0025] Reference Figure 1 and Figure 4 , Specifically, at the end of the inner wall of the pressure-resistant housing 1 close to the flange 2, there is a pressure detection assembly 8. The pressure detection assembly 8 includes a detection seat 81 adhesively and fixedly connected to the pressure-resistant housing 1 and a detection groove 82 opened on the detection seat 81. A detection rod 83 abutting against the flange 2 is slidably connected in the detection groove 82. A pressure sensor 84 is fixedly connected to the bottom of the detection groove 82. The flange 2 abuts against the detection rod 83, and the detection rod 83 abuts against the pressure sensor 84, so as to represent the pressure of the flange 2 abutting against the pressure-resistant housing 1 through the data of the pressure sensor 84, thereby controlling the sliding adjustment assembly 7 to adjust the position of the magnetic adsorption assembly 6, so as to realize intelligent regulation of the sealing effect according to the water depth, and increase the sealing effect in deep water to improve the safety effect.

[0026] Embodiment 2: A sealing connection method for a composite material pressure-resistant housing 1, applying a sealing connection structure for a composite material pressure-resistant housing 1 as shown in Embodiment 1, including: Step 1: Grind the end of the pressure-resistant housing 1, and install the support ring 5, the magnetic adsorption assembly 6, and the sliding adjustment assembly 7 inside the pressure-resistant housing 1; Step 2: Sleeve and connect the sealing ring 3 to the end of the pressure-resistant housing 1, and then sleeve and install the flange 2 on the pressure-resistant housing 1 until the end of the flange 2 abuts against the end of the pressure-resistant housing 1. After the installation is completed, the flange 2 is locked on the pressure-resistant housing 1 through the buckle locking assembly 4; Step 3: Connect the pressure-resistant housing 1 after installation through the flange 2. When entering deep water, the water pressure acts on the flange 2 to press the pressure-resistant housing 1 downward. The sealing ring 3 is compressed, and a magnetic suction force is applied to the flange 2 through the magnetic adsorption assembly 6 to increase the compression degree of the sealing ring 3, thereby improving the sealing effect. The magnetic adsorption assembly 6 is driven to move through the sliding adjustment assembly 7 to adjust the magnitude and position of the magnetic suction force.

[0027] This specific embodiment is only an interpretation of the present invention and is not a limitation thereof. After reading this specification, those skilled in the art can make creative contributions to this embodiment as needed, but as long as it is within the scope of the claims of the present invention, it is protected by the patent law.

Claims

1. A sealing connection structure for a composite pressure hull, comprising a pressure hull (1) and a flange (2) connected to an end of the pressure hull (1); characterized in that: A sealing ring (3) is provided between the flange (2) and the pressure-resistant shell (1); a locking connection is achieved between the outer surface of the pressure-resistant shell (1) and the flange (2) based on a snap-on locking assembly (4); a support ring (5) is coaxially fixedly connected inside the pressure-resistant shell (1); a plurality of magnetic adsorption assemblies (6) for applying a magnetic attraction force to the flange (2) are slidably connected to the support ring (5) along a circumferential direction; the magnetic adsorption assembly (6) is slidably connected to the support ring (5) along an inclined direction based on a sliding adjustment assembly (7) to adjust the magnitude of the magnetic attraction force between the flange (2) and the magnetic adsorption assembly (6).

2. A sealing connection structure for a composite pressure hull according to claim 1, characterized in that: The flange (2) comprises a connecting portion (21) coaxially connected to the pressure-resistant shell (1) and a flange mounting portion (22) coaxially fixedly connected to the connecting portion (21); the flange mounting portion (22) is provided with a plurality of flange holes (23); the connecting portion (21) comprises an outer bonding portion (211), an inner bonding portion (212) and an end surface bonding portion (213) respectively bonded to the outer surface, inner surface and end surface of the pressure-resistant shell (1); the end surface bonding portion (213) is provided with an end magnetic adsorption portion (214) extending in a direction away from the outer bonding portion (211); the flange (2) is made of steel and coated with an anti-corrosion coating on the outside.

3. A sealing connection structure for a composite pressure hull according to claim 2, characterized in that: The diameter of the flange mounting portion (22) is smaller than the diameter of the outer fitting portion (211) of the connecting portion (21) and larger than the diameter of the inner fitting portion (212), and a stepped structure is formed between the connecting portion (21) and the flange mounting portion (22).

4. A sealing connection structure for a composite pressure hull according to claim 2, characterized in that: The snap-on locking assembly (4) comprises a plurality of snap-on racks (41) fixedly connected to the outer fitting portion (211) at uniform intervals along the circumferential direction, and a plurality of snap-on blocks (42) fixedly connected to the pressure-resistant shell (1) at uniform intervals along the circumferential direction, wherein a snap-on slot (43) is provided on the snap-on block (42), and a snap-on assembly (44) for snapping and fixing the snap-on rack (41) in the snap-on slot (43) is movably connected in the snap-on slot (43).

5. A sealing connection structure for a composite pressure hull according to claim 4, characterized in that: The clamping assembly (44) comprises a movable groove (441) formed on the clamping block (42) along a direction perpendicular to the central plane of the pressure-resistant shell (1), and a clamping block (442) slidably connected in the movable groove (441) for clamping the clamping rack (41); the clamping block (442) and the clamping block (42) are connected based on a clamping spring (443).

6. A sealing connection structure for a composite pressure hull according to claim 2, characterized in that: The support ring (5) has a triangular cross-section and the inner diameter of the support ring (5) gradually increases in a direction toward the flange (2). The magnetic attraction component (6) comprises an arc-shaped mounting block (61) slidably connected to the support ring (5) in a direction parallel to the axial centerline of the pressure-resistant shell (1). The thickness of the arc-shaped mounting block (61) gradually increases in a direction toward the flange (2). A plurality of strong magnets (62) are evenly fixed on the end surface of the arc-shaped mounting block (61) that fits the support ring (5) and the end surface of the arc-shaped mounting block (61) close to the flange (2). The strong magnet (62) located at the end surface of the arc-shaped mounting block (61) that fits the support ring (5) is arranged parallel to the outer fitting portion (211), and the strong magnet (62) located at the end surface of the arc-shaped mounting block (61) close to the flange (2) is arranged parallel to the end magnetic attraction portion (214).

7. A sealing connection structure for a composite pressure hull according to claim 6, characterized in that: The sliding adjustment assembly (7) comprises a sliding screw (71) which is connected to the support ring (5) with its axis rotatable along a sliding direction parallel to the arc-shaped mounting block (61), and a sliding drive motor (72) which is fixedly connected to the support ring (5) and is used to drive the sliding screw (71) to rotate. The arc-shaped mounting block (61) is provided with a screw sliding hole (73) which cooperates with the sliding screw (71).

8. The sealing connection structure for a composite pressure hull according to claim 7, characterized in that: A pressure detection assembly (8) is provided at the end of the inner wall of the pressure-resistant shell (1) close to the flange (2), and the pressure detection assembly (8) comprises a detection seat (81) fixedly connected to the pressure-resistant shell (1) by adhesion, and a detection groove (82) provided on the detection seat (81), a detection rod (83) abutting against the flange (2) is slidably connected in the detection groove (82), and a pressure sensor (84) is fixedly connected to the bottom of the detection groove (82).

9. The sealing connection structure for a composite pressure hull according to claim 7, characterized in that: The strong magnet (62) is a neodymium magnet, the sliding drive motor (72) is a servo motor, and the sliding screw (71), the support ring (5) and the arc-shaped mounting block (61) are all made of hard plastic material.

10. A sealing connection method for a composite pressure hull (1), using a sealing connection structure for a composite pressure hull as claimed in any one of claims 1 to 9; characterized in that: include: Step 1: Grind the end of the pressure-resistant shell (1), and install the support ring (5), the magnetic adsorption component (6) and the sliding adjustment component (7) inside the pressure-resistant shell (1); Step 2: Sleeve and connect the sealing ring (3) to the end of the pressure-resistant shell (1), and then sleeve and install the flange (2) on the pressure-resistant shell (1) until the end of the flange (2) abuts against the end of the pressure-resistant shell (1). After the installation is completed, the flange (2) is locked on the pressure-resistant shell (1) by using the snap-on locking assembly (4); Step 3, the installed pressure-resistant shell (1) is connected through the flange (2). When entering deep water, the water pressure acts on the flange (2) so that the flange (2) presses the pressure-resistant shell (1) downward, and the sealing ring (3) is compressed. The magnetic attraction component (6) applies magnetic attraction force to the flange (2) to increase the compression degree of the sealing ring (3) and thus improve the sealing effect. The magnetic attraction component (6) is driven to move through the sliding adjustment component (7) to adjust the size and position of the magnetic attraction force.

Images