Multi-stage connection structure of end point of main frame of submersible cabin wall and pressure-resistant shell

Abstract

The application discloses a kind of submersible cabin bulkhead main frame end point and multistage connection structure of pressure hull, including pasting plate, T-shaped longitudinal bone, cabin bulkhead main frame and arc knee plate;Pasting plate is installed on the surface of pressure hull;T-shaped longitudinal bone includes T-shaped longitudinal bone web and T-shaped longitudinal bone faceplate, T-shaped longitudinal bone web is connected with pasting plate, and the end of T-shaped longitudinal bone web and T-shaped longitudinal bone faceplate is connected with plane cabin bulkhead;Cabin bulkhead main frame includes cabin bulkhead main frame web and cabin bulkhead main frame faceplate, and the end of cabin bulkhead main frame web and cabin bulkhead main frame faceplate is connected with T-shaped longitudinal bone faceplate;Arc knee plate is connected with T-shaped longitudinal bone faceplate and cabin bulkhead main frame faceplate.The application is connected by T-shaped longitudinal bone, pasting plate, arc knee plate, arc knee plate faceplate and other multistage, and structure stress is gradually reduced, and finally the problem of local stress concentration of pressure hull is solved, so that the stress of each structure is relatively uniform, the problem of local stress concentration is obviously improved, and the deformation between each structure is more coordinated.

Description

Technical Field

[0001] This invention relates to the field of ship hull structure design, and in particular to a connection structure between the end point of the main frame of a submarine bulkhead and the hull. Background Technology

[0002] Submarines, submersibles, and deep-sea space stations withstand significant underwater pressure. To facilitate both stress distribution and internal layout, the pressure hull is typically designed as a cylindrical shell structure, while the end bulkheads and internal bulkheads are designed as planar bulkhead structures. A typical example of the connection structure between the end points of the traditional planar bulkhead main frame and the pressure hull is shown in the attached diagram. Figure 1 As shown in the attached diagram. One method uses triangular elbow plates to reinforce the ends of the main frame, as shown in the attached diagram. Figure 1 (a) The connection between the elbow plate and the main frame effectively reduces the shear stress at the ends of the frame; another method is to reinforce the ends of the main frame by raising the elbow plate, as shown in the attached figure. Figure 1 (b) This effectively reduces the shear stress at the ends of the frame. However, at points M and N (or point P) where the elbow plate panel, main frame panel, and pressure hull connect, significant stress concentration occurs on the pressure hull. For various cylindrical submersibles, as diving depth increases, stress concentration at the connection between the main frame end point and the pressure hull becomes very pronounced. Under ultimate pressure, the stress on the inner surface of the pressure hull far exceeds the material's yield strength. Long-term use under ultimate pressure poses certain safety risks. Traditional designs to mitigate this stress concentration problem require significantly increasing the elbow plate size (both width and height need to be increased by 2-3 times; for example, in a large submersible, the triangular elbow plate size is approximately 2m × 2m, with a projected area of ​​approximately 2m²). 2 (It requires 10 sets of structures in the circumference), which poses a great challenge to the overall design of a submarine with limited internal space, and the layout is unacceptable. Summary of the Invention

[0003] To address the problems existing in the prior art, this invention proposes a multi-level connection structure between the end points of the main structure of the submersible bulkhead and the pressure hull. This structure uses T-shaped longitudinal ribs, plates, arc-shaped elbow plates, and arc-shaped elbow plate panels to gradually reduce structural stress and ultimately resolve the problem of local stress concentration in the pressure hull. At the same time, this structure is easy to construct and has good environmental adaptability.

[0004] The technical solution adopted in this invention is:

[0005] A multi-stage connection structure between the end point of the main bulkhead frame and the pressure hull of a submersible includes a panel, T-shaped longitudinal ribs, a main bulkhead frame, and an arc-shaped elbow plate. The panel is installed on the surface of the pressure hull. The T-shaped longitudinal rib includes a T-shaped longitudinal rib web and a T-shaped longitudinal rib panel. The T-shaped longitudinal rib web is connected to the panel, and the ends of the T-shaped longitudinal rib web and the T-shaped longitudinal rib panel are connected to the planar bulkhead. The main bulkhead frame includes a main bulkhead frame web and a main bulkhead frame panel. The ends of the main bulkhead frame web and the main bulkhead frame panel are connected to the T-shaped longitudinal rib panel. The arc-shaped elbow plate is connected to the T-shaped longitudinal rib panel and the main bulkhead frame panel.

[0006] In the above scheme, the T-shaped longitudinal bone also includes T-shaped longitudinal bone elbow plates located on both sides of the T-shaped longitudinal bone web, and the T-shaped longitudinal bone elbow plates are connected with the T-shaped longitudinal bone web and the T-shaped longitudinal bone face plate to form an integral structure.

[0007] In the above scheme, the T-shaped longitudinal bone elbow plate is arranged in 3-4 groups along the length of the T-shaped longitudinal bone.

[0008] In the above scheme, the edge of the arc-shaped elbow plate is provided with an arc-shaped elbow plate panel.

[0009] In the above scheme, the distance between the patch and the bulkhead is 200-300mm. Several plug welding holes are opened on the patch. After the pressure hull is constructed, the patch is tightly fitted and assembled with the pressure hull. The patch is welded to the pressure hull around the perimeter with fillet welds. The patch is plug welded to the pressure hull through the plug welding holes.

[0010] In the above scheme, the position of the plug weld hole does not coincide with the position of the T-shaped longitudinal bone web and the T-shaped longitudinal bone elbow plate, and the distance is not less than 50mm.

[0011] In the above scheme, the thickness of the lining plate is 0.8-1.0 times the thickness of the pressure-resistant shell, the width is 2.5-3.5 times the width of the T-shaped longitudinal rib panel, and the longitudinal length exceeds the web of the T-shaped longitudinal rib by 300-400mm; the lining plate material is high-strength steel used for the pressure-resistant shell.

[0012] In the above scheme, the height of the T-shaped longitudinal bone web is 200-300mm, and the thickness is 1.0-1.2 times the thickness of the web of the main bulkhead frame; the width of the T-shaped longitudinal bone panel is equal to the width of the main bulkhead frame panel, and the thickness is 0.9-1.1 times the thickness of the main bulkhead frame panel; the total length of the T-shaped longitudinal bone is 2.5-3.5 times the height of the main bulkhead frame.

[0013] In the above scheme, the thickness of the arc elbow plate is 0.7-1.0 times the thickness of the web plate of the main bulkhead frame, the maximum profile width and height are equal, and are 1.2-1.8 times the height of the main bulkhead frame, and the arc radius is 300-400mm; the thickness of the arc elbow plate panel is equal to the thickness of the arc elbow plate, and the width of the arc elbow plate panel is 80-100mm.

[0014] Accordingly, the present invention also proposes a method for preparing the above-mentioned multi-stage connection structure between the end points of the main frame of the submersible bulkhead and the pressure hull, including:

[0015] A patch section is provided in the area near the T-shaped longitudinal bone of the main bulkhead web plate and the main bulkhead panel. This patch section is not installed in the field. The other parts of the main bulkhead web plate and the main bulkhead panel are welded to the flat bulkhead in the field.

[0016] The T-shaped longitudinal bone web, T-shaped longitudinal bone face plate, and T-shaped longitudinal bone elbow plate are welded together in the inner field to form an integral T-shaped longitudinal bone component;

[0017] The arc-shaped elbow plate and the arc-shaped elbow plate panel are welded together in the inner field to form a single integral component;

[0018] After the pressure shell is constructed, the cladding plate is tightly fitted and assembled into place. The cladding plate is welded to the pressure shell around the perimeter with fillet welds, and the cladding plate is plug-welded to the pressure shell through plug weld holes.

[0019] After the flat bulkhead and pressure hull are assembled, the overall T-shaped longitudinal frame components are assembled and welded to the flat bulkhead, pressure hull, and cladding respectively.

[0020] Then the interlocking sections of the main bulkhead frame web and the main bulkhead frame panel were installed and welded in place;

[0021] Finally, the arc-shaped elbow plate is assembled and welded to the main bulkhead frame panel and the T-shaped longitudinal frame panel.

[0022] The beneficial effects of this invention are:

[0023] Compared to traditional designs, the multi-level connection structure between the main bulkhead frame endpoints and the pressure hull in this invention, through multiple levels of connections including T-shaped longitudinal ribs, cladding plates, arc-shaped elbow plates, and arc-shaped elbow plate panels, progressively reduces structural stress, ultimately resolving the problem of localized stress concentration in the pressure hull. This results in relatively uniform stress distribution across all structures, significantly improving the problem of localized stress concentration and enhancing the coordination of deformation between the various frames. Calculations show that, under the same external pressure conditions on a pressure hull, planar bulkhead, and main bulkhead frame, the maximum stress on the inner surface of the pressure hull is reduced by approximately 45%, and the maximum Von Mise stress at the endpoints of each main bulkhead frame is reduced by 40%.

[0024] The structure of the present invention, consisting of T-shaped longitudinal ribs, arc-shaped elbow plates, and bulkhead main frame, has relatively long T-shaped longitudinal ribs and arc-shaped elbow plates along the longitudinal direction of the ship, which effectively reduces the shear stress at the endpoints of the bulkhead main frame.

[0025] In the multi-level connection structure of this invention, the components such as the mounting plate, T-shaped longitudinal rib, arc-shaped elbow plate, and arc-shaped elbow plate panel are relatively small, facilitating construction and replacement. If the submersible frequently reaches its design limit depth during service, leading to localized structural fatigue, these components can be easily replaced during repairs. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the connection between the end point of the main frame of the traditional planar bulkhead and the pressure hull. (a) is a schematic diagram of the end point of the main frame reinforced with a triangular elbow plate, and (b) is a schematic diagram of the end point of the main frame reinforced with a raised web plate.

[0028] Figure 2 This is a schematic diagram of the multi-stage connection structure between the end points of the main frame of the submarine bulkhead and the pressure hull of the present invention;

[0029] Figure 3 yes Figure 2 A sectional view along the AA direction;

[0030] Figure 4 This is a schematic diagram of the solder joint holes for the mounting plate;

[0031] Figure 5 This is a schematic diagram of the planar bulkhead in an embodiment of the present invention;

[0032] Figure 6 This is a Von Mise stress cloud diagram of the T-shaped longitudinal web and the circular arc elbow plate in an embodiment of the present invention;

[0033] Figure 7 These are the normal stress cloud diagrams of the T-shaped longitudinal bone panel and the arc elbow plate panel in the embodiments of the present invention;

[0034] Figure 8 This is a longitudinal stress cloud diagram of the inner surface of the root of the pressure-resistant shell rib in an embodiment of the present invention;

[0035] Figure 9 This is a circumferential stress cloud diagram of the inner surface of the rib root of the pressure-resistant shell in an embodiment of the present invention;

[0036] Figure 10 This is a Von Mise stress cloud diagram of the inner surface of the pressure-resistant housing in an embodiment of the present invention.

[0037] In the diagram: 1. Pressure-resistant housing;

[0038] 2. Flat bulkhead;

[0039] 3. Mounting the board; 31. Plug solder holes;

[0040] 4. T-shaped longitudinal bone; 41. Stomach plate of T-shaped longitudinal bone; 42. Face plate of T-shaped longitudinal bone; 43. Elbow plate of T-shaped longitudinal bone;

[0041] 5. Arc-shaped elbow plate; 51. Arc-shaped elbow plate faceplate;

[0042] 6. Main bulkhead frame; 61. Web plate of main bulkhead frame; 62. Panel of main bulkhead frame. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0044] It should be noted that the illustrations provided in the embodiments of the present invention are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0045] In this invention, it should also be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used only for descriptive and distinguishing purposes and should not be construed as indicating or implying relative importance.

[0046] like Figure 2-3As shown in the figure, a multi-stage connection structure between the end point of the main bulkhead frame and the pressure hull proposed in this embodiment of the invention includes a panel 3, a T-shaped longitudinal rib 4, a main bulkhead frame 6, and an arc-shaped elbow plate 5. The panel 3 is installed on the surface of the pressure hull 1. The T-shaped longitudinal rib 4 includes a T-shaped longitudinal rib web 41, a T-shaped longitudinal rib panel 42, and T-shaped longitudinal rib elbow plates 43 located on both sides of the T-shaped longitudinal rib web 41. The T-shaped longitudinal rib web 41 is connected to the panel 3, and the ends of the T-shaped longitudinal rib web 41 and the T-shaped longitudinal rib panel 42 are connected to the planar bulkhead 2. The main bulkhead frame 6 includes a main bulkhead frame web 61 and a main bulkhead frame panel 62, and the ends of the main bulkhead frame web 61 and the main bulkhead frame panel 62 are connected to the T-shaped longitudinal rib panel 42. The arc-shaped elbow plate 5 is connected to the T-shaped longitudinal rib panel 42 and the main bulkhead frame panel 62, and the arc-shaped elbow plate 5 is provided with an arc-shaped elbow plate panel 51.

[0047] The multi-stage connection structure between the main bulkhead frame end points and the pressure hull proposed in this invention involves the main bulkhead frame 6 not being directly connected to the pressure hull 1, but instead being connected to the T-shaped longitudinal ribs 4. This transfers the stress on the main bulkhead frame 6, caused by external pressure on the pressure hull 1 and pressure on the planar bulkhead 2, to the T-shaped longitudinal ribs 4. The originally concentrated stress is then transferred to the cladding plate 3 via the T-shaped longitudinal rib web 41 and the T-shaped longitudinal rib elbow plate 43. Due to the significantly increased stress-bearing area, the stress at various points on the cladding plate 3 is significantly reduced. The cladding plate 3 effectively thickens the pressure hull 1 locally. Even at the design limit depth, when the stress on the inner surface of the cladding plate 3 reaches a high value, the stress on the inner surface of the pressure hull 1 is significantly reduced, effectively protecting the pressure hull 1. The arc-shaped elbow plate 5 effectively reduces the concentrated stress generated by the connection between the main bulkhead frame panel 62, the main bulkhead frame web 61, and the T-shaped longitudinal ribs 4. The arc-shaped elbow plate panel 51 resolves the stress concentration problem in the arc transition zone of the arc-shaped elbow plate 5. In summary, the multi-stage connection structure between the main bulkhead frame endpoints and the pressure hull designed in this invention results in relatively uniform stress distribution across all structures, significantly improves the problem of localized stress concentration, and enhances the coordination of deformation among the various structures.

[0048] Furthermore, the structure composed of T-shaped longitudinal ribs 4, arc-shaped elbow plates 5, and the main bulkhead frame 6, with the T-shaped longitudinal ribs and arc-shaped elbow plates being relatively long along the ship's longitudinal direction, effectively reduces the shear stress at the endpoints of the main bulkhead frame. The T-shaped longitudinal ribs are arranged close to the pressure hull, and compared to the triangular elbow plate reinforcement structure that meets stress requirements, the overall frame size of the T-shaped longitudinal ribs and arc-shaped elbow plates is significantly reduced, thus meeting the compartment layout requirements (again, taking a large submersible as an example, the projected area of ​​the T-shaped longitudinal ribs and arc-shaped elbow plates is approximately 0.74m²). 2 This is only 37% of the cost of the traditional triangular elbow plate solution.

[0049] like Figure 4As shown, the plate 3 has several plug weld holes 31. After the pressure shell 1 is constructed, the plate 3 is tightly fitted and assembled with the pressure shell 1. The plate 3 is welded to the pressure shell 1 around its perimeter using fillet welds. The plate 3 is plug welded to the pressure shell 1 through the plug weld holes 31. It should be noted that the positions of the plug weld holes 31 do not coincide with the positions of the T-shaped longitudinal bone web 41 and the T-shaped longitudinal bone elbow plate 43, and the distance between them is not less than 50mm. The use of plug welding increases the number of connection points between the plate 3 and the pressure shell 1, resulting in better stress uniformity.

[0050] Because the weld requirements between the flat bulkhead 2 and the pressure hull 1 are higher than those between the cladding plate 3 and the pressure hull 1, and considering the slight positional deviation between the installation of the cladding plate 3 and the flat bulkhead 2, and since the cladding plate 3 is first welded to the pressure hull 1, a certain distance of 200-300mm is left between the cladding plate 3 and the flat bulkhead 2 to ensure installation, welding quality, and weld dimensions. Therefore, the T-shaped longitudinal web plate 41 also needs to be connected to the pressure hull 1 in this area.

[0051] Further optimization is achieved by making the thickness of the cladding plate 3 0.8-1.0 times that of the pressure shell 1, its width 2.5-3.5 times that of the T-shaped longitudinal rib panel 42, and its longitudinal length 300-400mm longer than the web of the T-shaped longitudinal rib. The material used is high-strength steel, the same material used for the pressure shell 1.

[0052] Further optimization involves setting 3-4 sets of T-shaped longitudinal bone elbow plates 43 along the length of the T-shaped longitudinal bone 4. The T-shaped longitudinal bone elbow plates 43, T-shaped longitudinal bone web plates 41, and T-shaped longitudinal bone face plates 42 are connected to form an integral T-shaped longitudinal bone 4 component. The height of the T-shaped longitudinal bone web plate 41 is 200-300mm, and its thickness is 1.0-1.2 times the thickness of the main bulkhead frame web plate 61. The width of the T-shaped longitudinal bone face plate 42 is equal to the width of the main bulkhead frame face plate 62, and its thickness is 0.9-1.1 times the thickness of the main bulkhead frame face plate 62. The total length of the T-shaped longitudinal bone 4 is 2.5-3.5 times the height of the main bulkhead frame 6.

[0053] Further optimization is achieved by setting the thickness of the arc-shaped elbow plate 5 to 0.7-1.0 times the thickness of the web plate 61 of the main bulkhead frame, with the maximum profile width and height being equal and 1.2-1.8 times the height of the main bulkhead frame 6. The arc radius is 300-400mm. The thickness of the arc-shaped elbow plate panel 51 is equal to the thickness of the arc-shaped elbow plate 5, and the width of the arc-shaped elbow plate panel 51 is 80-100mm.

[0054] This invention also proposes a method for preparing the above-mentioned multi-stage connection structure between the end points of the main frame of the submersible bulkhead and the pressure hull, including:

[0055] A patch section is provided in the area of ​​the main bulkhead frame web plate 61 and the main bulkhead frame panel 62 near the T-shaped longitudinal bone 4. This patch section is not installed in the field. The other parts of the main bulkhead frame web plate 61 and the main bulkhead frame panel 62 are welded to the flat bulkhead 2 in the field.

[0056] The T-shaped longitudinal bone web plate 41, the T-shaped longitudinal bone face plate 42, and the T-shaped longitudinal bone elbow plate 43 are welded together in the inner field to form an integral T-shaped longitudinal bone 4 component.

[0057] The arc-shaped elbow plate 5 and the arc-shaped elbow plate panel 51 are welded together in the inner field to form an integral component;

[0058] After the pressure shell 1 is constructed, the plate 3 is tightly fitted and assembled into the pressure shell 1. The plate 3 is welded to the pressure shell 1 around the perimeter by fillet welds. The plate 3 is plug-welded to the pressure shell 1 through the plug weld holes 31.

[0059] After the flat bulkhead 2 and the pressure hull 1 are assembled, the four integral T-shaped longitudinal ribs are assembled into place and welded to the flat bulkhead 2, the pressure hull 1, and the lining plate 3 respectively.

[0060] Then the interlocking sections of the main bulkhead frame web plate 61 and the main bulkhead frame panel 62 were installed and welded in place;

[0061] Finally, the arc-shaped elbow plate 5 is assembled and welded to the main bulkhead frame panel 62 and the T-shaped longitudinal frame panel 42.

[0062] To verify the technical effect of the multi-level connection structure between the end point of the main structure of the submersible bulkhead and the pressure hull of the present invention, finite element models of the pressure hull ribs and different connection structures of the pressure hull 1, the planar bulkhead 2, the main structure of the bulkhead 6, and the main structure of the end point of the bulkhead were established, and the effects of different connection structure forms between the end point of the planar bulkhead and the pressure hull were analyzed and calculated.

[0063] like Figure 5 As shown, the entire planar bulkhead consists of five main structural frames: vertical main beam I, vertical main beam II (symmetrical on both port and starboard sides), upper horizontal support beam IV, and lower horizontal support beam V. For comparative calculations, the upper and lower ends of the starboard vertical main beam II adopt a structure of veneer plate + T-shaped longitudinal rib + triangular elbow plate. The starboard ends of upper horizontal support beam IV and lower horizontal support beam V adopt a structure of veneer plate + triangular elbow plate reinforcement. The ends of other bulkhead main structural frames adopt the multi-level connection structure proposed in this invention.

[0064] According to traditional design methods, Figure 1 The maximum Von Mise stresses at points M and N, where the main frame of the mid-hull connects to the shell, are approximately 1.8σs and 1.6σs, respectively. (For example...) Figure 6 The maximum stress occurs at the end of the longitudinal rib web and the arc-shaped elbow plate of the main bulkhead frame. Figure 2Points S and Q near the ribs of the medium-pressure shell. The maximum Von Mise stress at point S is 905 MPa (approximately 1.15 σs) and at point Q is 843 MPa (approximately 1.07 σs), with the maximum stress reduced by approximately 43%.

[0065] like Figure 7 The maximum normal stress (1111 MPa) of the panel with the T-shaped longitudinal rib + arc-shaped elbow plate structure at the end of the main bulkhead is located in the arc area of ​​the arc-shaped elbow plate panel 51. The high stress concentration there will not affect the pressure hull 1 or the cladding plate 3. However, the maximum normal stress (1079 MPa) of the panel with the triangular elbow plate structure is located at the connection between the panel and the cladding plate 3. This stress acts directly on the cladding plate and is transferred to the pressure hull 1.

[0066] Circumferential stress on the inner surface of plate 3: For the structure reinforced with triangular elbow plates, the maximum stress at the right end of the upper horizontal beam IV (attached to the plate) is 1485 MPa, and the maximum stress at the right end of the lower horizontal beam V (attached to the plate) is 1155 MPa. However, for the structure reinforced with T-shaped longitudinal stiffeners and arc-shaped elbow plates, the maximum stress at the left end of the upper horizontal beam IV (attached to the plate) is 929 MPa, and the maximum stress at the left end of the lower horizontal beam V (attached to the plate) is 705 MPa. Calculation results show that, under the same main frame conditions, the structure reinforced with T-shaped longitudinal stiffeners and arc-shaped elbow plates reduces the maximum circumferential stress on the inner surface of the plate by approximately 40% compared to the structure reinforced with triangular elbow plates.

[0067] The lining plate 3 provides significant protection for the pressure-resistant shell 1. After applying the lining plate 3, the longitudinal and circumferential stress cloud diagrams of the inner surface of the rib root of the pressure-resistant shell 1 are shown in the figure. Figure 8 , Figure 9 The maximum longitudinal stress is 630 MPa, and the maximum circumferential stress is 770 MPa. The Von Mise stress cloud diagram of the inner surface of pressure shell 1 is shown below. Figure 10 The maximum Von Mise stress on the inner surface is 798 MPa (1.01 σs), which is much smaller than the Von Mise stress at point M (approximately 1.8 σs) and point N (approximately 1.6 σs) when the frame is connected to the shell using the traditional design method.

[0068] It should be noted that, depending on the implementation needs, the various steps / components described in this application can be broken down into more steps / components, or two or more steps / components or parts of the operation of steps / components can be combined into new steps / components to achieve the purpose of this invention.

[0069] The order of the steps in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0070] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A multi-stage connection structure between the end points of the main frame of a submersible bulkhead and the pressure hull, characterized in that, The system includes a panel, T-shaped longitudinal ribs, a main bulkhead frame, and an arc-shaped elbow plate. The panel is installed on the surface of the pressure hull. The T-shaped longitudinal rib includes a T-shaped longitudinal rib web and a T-shaped longitudinal rib panel. The T-shaped longitudinal rib web is connected to the panel, and the ends of the T-shaped longitudinal rib web and the T-shaped longitudinal rib panel are connected to the planar bulkhead. The main bulkhead frame includes a main bulkhead frame web and a main bulkhead frame panel. The ends of the main bulkhead frame web and the main bulkhead frame panel are connected to the T-shaped longitudinal rib panel. The arc-shaped elbow plate is connected to the T-shaped longitudinal rib panel and the main bulkhead frame panel.

2. The multi-stage connection structure between the end points of the main frame of the submersible bulkhead and the pressure hull according to claim 1, characterized in that, The T-shaped longitudinal bone also includes T-shaped longitudinal bone elbow plates located on both sides of the T-shaped longitudinal bone web, and the T-shaped longitudinal bone elbow plates are connected with the T-shaped longitudinal bone web and the T-shaped longitudinal bone face plate to form an integral structure.

3. The multi-stage connection structure between the end points of the main frame of the submersible bulkhead and the pressure hull according to claim 2, characterized in that, The T-shaped longitudinal bone elbow plates are arranged in 3-4 groups along the length of the T-shaped longitudinal bone.

4. The multi-stage connection structure between the end points of the main frame of the submersible bulkhead and the pressure hull according to claim 1, characterized in that, The edge of the arc-shaped elbow plate is provided with an arc-shaped elbow plate panel.

5. The multi-stage connection structure between the end points of the main frame of the submersible bulkhead and the pressure hull according to claim 1, characterized in that, The distance between the patch and the bulkhead is 200-300mm. Several plug welding holes are opened on the patch. After the pressure hull is constructed, the patch is tightly fitted and assembled with the pressure hull. The patch is welded to the pressure hull around the perimeter with fillet welds. The patch is plug welded to the pressure hull through the plug welding holes.

6. The multi-stage connection structure between the end points of the main frame of the submersible bulkhead and the pressure hull according to claim 5, characterized in that, The location of the plug weld hole does not coincide with the location of the web plate and elbow plate of the T-shaped longitudinal bone, and the distance is not less than 50mm.

7. The multi-stage connection structure between the end points of the main frame of the submersible bulkhead and the pressure hull according to claim 1, characterized in that, The thickness of the cladding plate is 0.8-1.0 times the thickness of the pressure-resistant shell, the width is 2.5-3.5 times the width of the T-shaped longitudinal rib panel, and the longitudinal length exceeds the web of the T-shaped longitudinal rib by 300-400mm; the cladding plate material is high-strength steel used in the pressure-resistant shell.

8. The multi-stage connection structure between the end points of the main frame of the submersible bulkhead and the pressure hull according to claim 1, characterized in that, The T-shaped longitudinal bone web plate has a height of 200-300mm and a thickness of 1.0-1.2 times that of the main bulkhead web plate; the T-shaped longitudinal bone panel has a width equal to that of the main bulkhead panel and a thickness of 0.9-1.1 times that of the main bulkhead panel; the total length of the T-shaped longitudinal bone is 2.5-3.5 times the height of the main bulkhead.

9. The multi-stage connection structure between the end points of the main frame of the submersible bulkhead and the pressure hull according to claim 1, characterized in that, The thickness of the arc-shaped elbow plate is 0.7-1.0 times the thickness of the web plate of the main bulkhead frame. The maximum outline width and height are equal, which is 1.2-1.8 times the height of the main bulkhead frame. The arc radius is 300-400mm. The thickness of the arc-shaped elbow plate panel is equal to the thickness of the arc-shaped elbow plate. The width of the arc-shaped elbow plate panel is 80-100mm.

10. The method for preparing the multi-stage connection structure between the end points of the main frame of the submersible bulkhead and the pressure hull according to any one of claims 1-9, characterized in that, include: A patch section is provided in the area near the T-shaped longitudinal bone of the main bulkhead web plate and the main bulkhead panel. This patch section is not installed in the field. The other parts of the main bulkhead web plate and the main bulkhead panel are welded to the flat bulkhead in the field. The T-shaped longitudinal bone web, T-shaped longitudinal bone face plate, and T-shaped longitudinal bone elbow plate are welded together in the inner field to form an integral T-shaped longitudinal bone component; The arc-shaped elbow plate and the arc-shaped elbow plate panel are welded together in the inner field to form a single integral component; After the pressure shell is constructed, the cladding plate is tightly fitted and assembled into place. The cladding plate is welded to the pressure shell around the perimeter with fillet welds, and the cladding plate is plug-welded to the pressure shell through plug weld holes. After the flat bulkhead and pressure hull are assembled, the overall T-shaped longitudinal frame components are assembled and welded to the flat bulkhead, pressure hull, and cladding respectively. Then the interlocking sections of the main bulkhead frame web and the main bulkhead frame panel were installed and welded in place; Finally, the arc-shaped elbow plate is assembled and welded to the main bulkhead frame panel and the T-shaped longitudinal frame panel.

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