A shielding membrane mounting structure for cryogenic cargo compartments
By setting grooves on the cover plate to fix the metal plate and chamfering the shielding film installation structure, the problem of insufficient welding quality in the prior art is solved, high-quality connection between shielding films is achieved, and airtightness and service life are improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 恒力造船(大连)有限公司
- Filing Date
- 2026-05-27
- Publication Date
- 2026-08-04
AI Technical Summary
The existing LNG cargo tank shielding membrane installation structure is difficult to guarantee welding quality during the welding process, especially at the corner joints of the shielding membrane, resulting in insufficient airtightness and connection strength.
The metal plate is fixed by setting grooves on the cover plate, and the edges of the overlapping area between the shielding film and the metal plate are welded. The corners of the shielding film are chamfered. The welding connection between the metal plate and the shielding film avoids multiple overlapping joints and improves the welding quality and connection strength.
It effectively improves the sealing performance and connection strength between the shielding membranes, enhances the airtightness and service life of the cargo hold, and reduces the complexity and cost of installation.
Smart Images
Figure CN224589317U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of shielding membrane installation structure connection for maintaining thermal insulation and airtightness in cargo holds of LNG ships or marine / land facilities, and in particular to a shielding membrane installation structure for cryogenic cargo holds. Background Technology
[0002] Typically, to transport or store cryogenic cargo in LNG ships or marine / land facilities, insulation materials must be installed to maintain the extremely low temperatures in the cargo holds. Covering panels, primary shielding membranes, and secondary shielding membranes must be fixed to the insulation material. Both the primary and secondary shielding membranes are composed of multiple corrugated shielding membranes spliced together, and they are used to ensure the airtightness of the LNG cargo holds. However, existing LNG cargo tank shielding membranes are generally welded by direct overlapping or butt welding to achieve airtightness. The existing installation structure of LNG cargo tank shielding membranes has the following shortcomings: When the shielding membranes are welded by butt welding, the welding quality of the weld cannot be effectively guaranteed, which will result in the inability to guarantee the airtightness of the LNG cargo tank. This is especially true at the corner joints of multiple (four) shielding membranes, where a large number of welding points are required, making it even more difficult to guarantee the welding quality. When the shielding membranes are welded by overlapping, multiple layers of shielding membranes are required at the corner joints of the four shielding membranes. This not only makes welding difficult, but the height after welding is much greater than the thickness of the shielding membrane, affecting the installation and fixation of other components, and thus affecting the airtightness of the LNG cargo tank. Utility Model Content
[0003] This invention addresses the problems existing in the prior art by proposing a shielding membrane installation structure for cryogenic cargo compartments.
[0004] The technical means adopted in this utility model are as follows: A shielding membrane installation structure for cryogenic cargo compartments includes a cover plate disposed on an insulation material panel and multiple sets of shielding membranes disposed on the cover plate for airtight fixing of the insulation material panel of the cargo compartment. Each set of shielding membranes includes four shielding membranes distributed in a rectangular array and also includes multiple metal plates. The cover plate has grooves processed at positions corresponding to the center of the rectangular array distribution of each group of shielding films, and a metal plate is fixed in each groove. The four shielding films in each shielding film group are arranged in a rectangular array with the center point of the metal plate as the center, and the adjacent sides of the four shielding films overlap each other in sequence, and the corners of the shielding films are chamfered. The edge of the overlapping area between the shielding film and the metal plate is welded to the metal plate, and the edge of the overlapping edge of the shielding film is welded to the film body of the adjacent shielding film.
[0005] Furthermore, the depth of the groove is greater than or equal to the sum of the thickness of the metal plate and the thickness of the shielding film, so that when the shielding film assembly is disposed on the cover plate, a portion of the edge of the shielding film can be folded to form a bent edge and the bent edge is placed in the groove.
[0006] Furthermore, it also includes a heat insulation protection plate located on the outer periphery of the metal plate and corresponding to the overlapping edge of the shielding film, the heat insulation protection plate being fixed to the cover plate.
[0007] Furthermore, the metal plate is mechanically fixed in the groove of the cover plate by screws or rivets.
[0008] Furthermore, the heat insulation protection plate is mechanically fixed to the cover plate by staples.
[0009] Furthermore, the overlapping edge of the shielding film in contact with the heat insulation protection plate is mechanically fixed to the heat insulation protection plate by screws or rivets.
[0010] Furthermore, the corners of the shielding film on the metal plate are either chamfered right angles or rounded corners.
[0011] Furthermore, the material of the heat insulation protection plate is fiberglass.
[0012] Furthermore, the cover plate is plywood.
[0013] Compared with the prior art, the shielding membrane installation structure for cryogenic cargo holds disclosed in this utility model has the following beneficial effects: In this application, because the cover plate is provided with a groove for accommodating the metal plate, and the adjacent edges of the four shielding membranes in each group of shielding membranes overlap sequentially, and the edge of the area where the shielding membrane overlaps with the metal plate is welded to the metal plate, and the edge of the overlapping edge of the shielding membrane is welded to the membrane body of the adjacent shielding membrane, the setting of the metal plate allows the corners of the shielding membrane to be chamfered, thereby avoiding the problem that the boundaries of the four adjacent shielding membranes need to be overlapped sequentially during overlapping welding, which makes welding inconvenient and the height after welding is much greater than the thickness of the shielding membrane, affecting the installation and fixing of other components. By chamfering the corners, the corners can be welded to the metal plate, thereby effectively improving the welding performance of the corners of the shielding membrane, thereby effectively improving the sealing performance between the shielding membranes, and at the same time improving the connection strength between the shielding membranes, thereby improving the airtightness and service life of the cargo hold. Attached Figure Description
[0014] Figure 1 This is a top view of the shielding membrane installation structure for cryogenic cargo compartments disclosed in this utility model. Figure 2This is a cross-sectional view of the shielding membrane installation structure for cryogenic cargo compartments disclosed in this utility model. Figure 3 This is a structural diagram of the existing cargo hold; In the diagram: 1. Insulation material panel; 2. Covering plate; 20. Groove; 3. Shielding film assembly; 30. Shielding film; 301. Shielding film one; 302. Shielding film two; 303. Shielding film three; 304. Shielding film four; 31. Bending edge; 4. Metal edge; 5. Thermal insulation protection plate; 6. Screw or rivet; 7. Staple; 8. Mechanical fastener; 90. Weld one; 91. Weld two; 92. Weld three; 93. Weld four. Detailed Implementation
[0015] like Figure 1 and Figure 2 As shown, the shielding film installation structure for cryogenic cargo compartment disclosed in this utility model includes a cover plate 2 disposed on the insulation material panel 1 and multiple sets of shielding film groups 3 disposed on the cover plate 2 for airtight fixing of the insulation material panel 1 of the cargo compartment. Each set of shielding film groups 3 includes four shielding films 30 distributed in a rectangular array, and also includes multiple metal plates 4. The cover plate 2 has grooves 20 at positions corresponding to the center of the rectangular array distribution of each group of shielding film groups 3, and a metal plate 4 is fixed in each groove 20; The four shielding films 30 in each shielding film group 3 are arranged in a rectangular array with the center point of the metal plate 4 as the center, and the adjacent sides of the four shielding films 30 overlap each other in sequence, and the corners of the shielding films 30 are chamfered. The edge of the overlapping area of the shielding film 30 and the metal plate 4 is welded to the metal plate 4, and the edge of the overlapping edge of the shielding film 30 is welded to the film body of the adjacent shielding film 30.
[0016] Specifically, such as Figure 3As shown, the existing cryogenic cargo hold includes a lower insulation panel 1 and an upper insulation panel 1. The lower and upper insulation panels 1 are fixedly connected by mechanical fasteners 8. The lower insulation panel 1 is fixedly connected to the outer shell of the cargo hold hull by mechanical fasteners 8. A cover plate 2 is fixed on the upper insulation panel 1, and a corrugated primary shielding membrane (upper shielding membrane group 3) is fixed on the cover plate 2. The primary shielding membrane is the primary barrier in contact with LNG. A corrugated secondary shielding membrane (lower shielding membrane group 3) is fixed between the cover plate 2 and the lower side of the upper insulation panel 1. The secondary shielding membrane is used as a secondary sealing layer (to ensure safety) in case of leakage of the primary barrier. Both the primary shielding membrane and the secondary shielding membrane include multiple shielding membrane groups 3. The shielding membrane groups 3 are used to achieve airtightness of the cargo hold's insulation panel. The corrugated shielding membrane can absorb the stress caused by thermal contraction / expansion and allows deformation, such as... Figure 1 and Figure 2 As shown, this application also includes multiple metal plates 4; grooves 20 are machined on the cover plate 2 at positions corresponding to the center of the rectangular array distribution of each group of shielding film groups 3, and a metal plate 4 is fixed in each groove 20; the four shielding films 30 of each group of shielding film groups 3 are distributed in a rectangular array with the center point of the metal plate 4 as the center, and the adjacent sides of the four shielding films 30 overlap with each other in sequence, and the corners of the shielding films 30 are chamfered; the edge of the overlapping area of the shielding film 30 and the metal plate 4 is welded to the metal plate 4, and the edge of the overlapping edge of the shielding film 30 is welded to the film body of the adjacent shielding film 30. In this application, because the cover plate 2 is provided with grooves for accommodating the metal plates 4, and the adjacent sides of the four shielding films 30 of each group of shielding film groups 3 overlap in sequence, and the shielding films The edge of the area where shielding membrane 30 overlaps with metal plate 4 is welded to metal plate 4. The edge of the overlapping edge of shielding membrane 30 is welded to the membrane body of adjacent shielding membrane 30. The setting of metal plate 4 allows the corners of shielding membrane 30 to be chamfered, thus avoiding the need for the boundaries of four adjacent shielding membranes 30 to overlap sequentially during overlapping welding, which would make welding inconvenient and the height after welding would be much greater than the thickness of the shielding membrane, affecting the installation and fixing of other components. Furthermore, chamfering the corners allows the corners to be welded to metal plate 4. This structure can effectively improve the welding performance of the corners of shielding membrane 30, thereby effectively improving the sealing performance between shielding membranes 30 and increasing the connection strength between shielding membranes 30, thus improving the airtightness and service life of the cargo hold.
[0017] Specifically, such as Figure 1The diagram shows the installation structure of a set of shielding film group 3 in the shielding film installation structure for cryogenic cargo compartments disclosed in this utility model. It includes shielding film one 301, shielding film two 302, shielding film three 303, and shielding film four 304. Shielding film one 301 is located at the bottom layer (i.e., shielding film one 301 is installed first on the cover plate 2). The edge of the area where shielding film one 301 overlaps with the metal plate 4 is welded to form weld seam one 90. Then, shielding film two 302 is installed. The adjacent edge of shielding membrane 301 overlaps and is welded to the membrane body of shielding membrane 301. The edge of the area where shielding membrane 302 overlaps and directly contacts metal plate 4 is welded to metal plate 4, that is, shielding membrane 302 is welded to shielding membrane 301 and metal plate 4 to form weld 2 91; next, shielding membrane 303 is installed, the adjacent edge of shielding membrane 303 overlaps and is welded to the membrane body of shielding membrane 302, and shielding membrane 303 overlaps with metal plate 4. Furthermore, the edge of the area in direct contact is welded to the metal plate 4, that is, the shielding membrane 303 is welded to the shielding membrane 2 302 and the metal plate 4 to form weld seam 3 92; finally, the shielding membrane 4 304 is installed, and the adjacent edges of the shielding membrane 4 304 overlap with the membrane bodies of the shielding membrane 303 and the shielding membrane 1 301 respectively and are welded. The edge of the area where the shielding membrane 4 304 overlaps with the metal plate 4 and is in direct contact is welded to the metal plate 4, that is, the shielding membrane 4 304 is welded to the shielding membrane 303, the shielding membrane 1 301 and the metal plate 4 to form weld seam 4 93; as can be seen from the figure, the scheme disclosed in this application can not only realize the overlapping welding between each shielding membrane 30 to ensure the welding quality between each shielding membrane 30, but also ensure that at most two layers of shielding membrane 30 overlap in the welding area, avoiding the thickness of multiple layers of shielding membrane 30 overlapping which would be much greater than the thickness of the shielding membrane, affecting the installation and fixation of other components, and also affecting the airtightness of the LNG cargo tank.
[0018] Furthermore, the depth of the groove 20 is greater than or equal to the sum of the thickness of the metal plate 4 and the thickness of the shielding film 30, so that when the shielding film group 3 is placed on the cover plate 2, the edges of part of the shielding film 30 can be folded to form a bent edge 31 and the bent edge 31 is placed in the groove 20. That is, in this application, the overlapping shielding films 30 are bent to the same size as their thickness, so that the bent part is located at the bottom when overlapping, and the other layer of shielding film 30 does not need to be bent. That is, the upper surface of the downward overlapping joint is kept flat, so there will be no interference when installing the upper plate, thereby optimizing the quality of the overlapping joint, ensuring welding quality and service life, improving quality and reducing installation costs.
[0019] Furthermore, it also includes a heat insulation protection plate 5 located on the outer periphery of the metal plate 4 and corresponding to the overlapping edge of the shielding film 30. The heat insulation protection plate 5 is fixed on the cover plate 2. By setting the heat insulation protection plate 5, the heat generated during the welding of the shielding film 30 can be effectively isolated to prevent the cover plate below from being burned and damaged during welding. At the same time, the heat insulation protection plate 5 can be made of non-metallic material, which can effectively reduce costs.
[0020] Furthermore, the metal plate 4 is mechanically fixed in the groove 20 of the cover plate 2 by screws or rivets 6. Fixing the metal plate 4 in the groove 20 of the cover plate 2 by screws or rivets not only reduces the difficulty of operation, but also reduces the installation cost.
[0021] Furthermore, the heat insulation protection plate 5 is mechanically fixed to the cover plate 2 by staples 7, so that the heat insulation protection plate 5 can be installed and fixed quickly and conveniently.
[0022] Furthermore, the overlapping edge of the shielding film 30 in contact with the heat insulation protection plate 5 is mechanically fixed to the heat insulation protection plate 5 by screws or rivets 6. In this application, the overlapping edge of the shielding film 30 in contact with the heat insulation protection plate 5 is mechanically fixed to the heat insulation protection plate 5 by screws or rivets 6, which has the advantages of convenient operation and easy fixation.
[0023] Furthermore, the edges and corners of the shielding film 30 on the metal plate 4 are either right angles or rounded corners. By making the edges and corners right angles or rounded corners, welding can be facilitated. Preferably, the edges and corners are processed into rounded corners. This enables automated welding to ensure welding quality.
[0024] Furthermore, the heat insulation protection plate 5 is made of fiberglass, which can effectively isolate the heat generated during the welding of the shielding film 30, so as to prevent the lower cover plate 2 from being burned during welding and thus damaging the cover plate 2, and reduce costs.
[0025] Furthermore, the cover plate 2 is made of plywood, which allows for easy processing of the groove 20 and fixing of the metal plate 4 and the heat insulation protection plate 5.
[0026] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A shielding membrane installation structure for an ultra-low temperature cargo hold, comprising a cover plate disposed on an insulation material panel and multiple sets of shielding membranes disposed on the cover plate for airtightly fixing the insulation material panel of the cargo hold, each set of the shielding membranes comprising four shielding membranes arranged in a rectangular array, characterized in that: It also includes multiple metal plates; The cover plate has grooves processed at positions corresponding to the center of the rectangular array distribution of each group of shielding films, and a metal plate is fixed in each groove. The four shielding films in each shielding film group are arranged in a rectangular array with the center point of the metal plate as the center, and the adjacent sides of the four shielding films overlap each other in sequence, and the corners of the shielding films are chamfered. The edge of the overlapping area between the shielding film and the metal plate is welded to the metal plate, and the edge of the overlapping edge of the shielding film is welded to the film body of the adjacent shielding film.
2. The shielding membrane installation structure for cryogenic cargo compartments according to claim 1, characterized in that: The depth of the groove is greater than or equal to the sum of the thickness of the metal plate and the thickness of the shielding film, so that when the shielding film assembly is placed on the cover plate, a portion of the edge of the shielding film can be folded to form a bent edge and the bent edge is placed in the groove.
3. The shielding membrane installation structure for cryogenic cargo compartments according to claim 1 or 2, characterized in that: It also includes a heat insulation protection plate located on the outer periphery of the metal plate and corresponding to the overlapping edge of the shielding film, the heat insulation protection plate being fixed to the cover plate.
4. The shielding membrane installation structure for cryogenic cargo holds according to claim 1, characterized in that: The metal plate is mechanically fixed in the groove of the cover plate by screws or rivets.
5. The shielding membrane installation structure for cryogenic cargo compartments according to claim 3, characterized in that: The heat insulation protection plate is mechanically fixed to the cover plate by staples.
6. The shielding membrane installation structure for cryogenic cargo compartments according to claim 5, characterized in that: The overlapping edge of the shielding film in contact with the heat insulation protection plate is mechanically fixed to the heat insulation protection plate by screws or rivets.
7. The shielding membrane installation structure for cryogenic cargo compartments according to claim 1, characterized in that: The edges and corners of the shielding film on the metal plate are either chamfered right angles or rounded corners.
8. The shielding membrane installation structure for cryogenic cargo compartments according to claim 3, characterized in that: The heat insulation protection panel is made of fiberglass.
9. The shielding membrane installation structure for cryogenic cargo holds according to claim 1, characterized in that: The cover plate is made of plywood.