Penetrating fastener for thin-film-type enclosure system

Abstract

A penetrating fastener (28) for a thin-film-type enclosure system, the penetrating fastener (28) being configured to connected a main-layer thin film layer (34), a fastening attachment plate, a main-layer insulating layer, a secondary-layer thin film layer (32) and a secondary-layer insulating layer and fix same to a ship body structure. The penetrating fastener (28) is divided into an upper section portion (25) and a lower section portion (10). The lower section portion (10) comprises a welding base (1) and a metal connecting rod (3) having threads on two ends, the welding base (1) being welded and fixed to a cabin wall of a ship body. The upper section portion (25) comprises a lower-end cap rod structure (11), a lower-end metal plate (12), a bridge block (13), an upper-end metal plate (14), long bolts (19), washers (20), a double-threaded screw (21) and a metal sealing cap (22), wherein the lower-end cap rod structure (11) is fixedly connected to the upper end of the metal connecting rod (3), and the lower-end cap rod structure (11) is fixedly connected to a lower-end welding metal piece (4) provided on the upper portion of a secondary-layer insulating layer module (31); the lower-end metal plate (12) is disposed on a fixing cushion block fixedly connected to a middle plate of a main-layer insulating layer module (33); and the upper end of the double-threaded screw (21) runs through an upper-end welding metal piece (24) provided on the upper end of a central hole of a linear fastening attachment plate (35a) or a cross-shaped fastening attachment plate (35b) provided at the top of the main-layer insulating layer module (33) and is then fixedly connected to the metal sealing cap (22).

Description

A through-fastener for membrane type enclosure system

[0001] Related applications

[0002] This application claims priority to Chinese patent application No. 202311517093.0 filed on November 14, 2023, and cites the contents disclosed in the above patent application as part of this application. Technical Field

[0003] The present application relates to the technical field of equipment for transporting and storing cryogenic liquids, and in particular to a through-fastener for a membrane-type enclosure system. Background Art

[0004] When transporting gases like natural gas and ethane, for more economical long-distance transportation, the gases are often cooled to low temperatures and transported in a liquefied form. Liquefied gases significantly reduce their volume, lowering transportation costs. Liquefied cryogenic liquids are stored and transported in specialized cryogenic tanks. Marine cryogenic tanks include four main containment systems: Type A, Type B, Type C, and membrane containment systems. Membrane containment systems are widely used due to their high tank capacity utilization, excellent thermal insulation, and reduced wind resistance.

[0005] The existing membrane-type containment system technologies mainly include Mark III and NO 96. The membrane-type containment structure and the hull structure are usually connected by bonding or fasteners. The main type of fasteners used for connection is NO96. The NO96 fasteners mainly fasten the primary and secondary insulation layers to the hull structure. The elastic compression block of the fastener is located in the space of the secondary insulation layer. The elastic compression block has the function of absorbing the deformation of the containment structure. Under various harsh marine conditions, the sloshing impact force of liquid cargo mainly acts on the main membrane layer and is transmitted to the main insulation layer structure through the main membrane layer, resulting in the sloshing impact force not being well transmitted to the elastic compression block. Therefore, the existing NO96 containment structure has poor resistance to liquid cargo sloshing. Secondly, the primary and secondary membrane layers are fixedly connected by the tabs provided on the primary and secondary insulation layers respectively. The various connection methods of the fasteners and the membrane layer connection tabs are complicated, resulting in a long construction period.

[0006] Summary of the Invention

[0007] In view of the above-mentioned problems existing in the prior art, an embodiment of the present application provides a through-fastener for a new film-type enclosure system that replaces the existing connection method of the NO96 film-type enclosure system.

[0008] The embodiment of the present application provides a through-fastener for a membrane-type enclosure system, which is used to accommodate ultra-low temperature media, including a main membrane layer, a fastening card, a main insulation layer, a secondary membrane layer, and a secondary insulation layer, which are sequentially connected and fixed to the hull structure by the through-fastener. The main membrane layer, the main insulation layer, the secondary membrane layer, and the secondary insulation layer enclose a cryogenic liquid cargo storage tank for accommodating ultra-low temperature media; wherein the through-fastener includes: an upper portion and a lower portion, specifically,

[0009] The lower section includes a welding base and a metal connecting rod with threads at both ends. The welding base is welded and fixed to the bulkhead of the hull structure according to the markings. The welding base contains a nut. The lower end of the metal connecting rod is fixedly connected to the nut in the welding base, and the upper end is set through the secondary insulating layer. The metal connecting rod is provided with a chamfered thread at the position where it passes through the upper part of the secondary insulating layer to facilitate tightening the metal connecting rod, thereby facilitating tightening and fixing with a torque tool.

[0010] The upper section consists of a lower cap rod structure, a lower metal plate, a bridge block, an upper metal plate, a disc spring, a locking cap, a locking plate, four springs, four long bolts, four washers, a stud screw, and a metal sealing cap. The lower cap rod structure is fixedly connected to the upper end of the metal connecting rod and pressed tightly against the lower welded metal sheet on the upper portion of the secondary insulation module. The lower end of the lower cap rod structure has a boss edge welded to the lower welded metal sheet for a seal.

[0011] The lower end metal plate is arranged on a fixed pad fixedly connected to the middle plate of the main layer insulation layer module, and the upper end of the double-headed screw passes through the upper end of the center hole of the I-shaped fastening card or the cross-shaped fastening card arranged on the top of the main layer insulation layer module, and is fixedly connected to the metal sealing cap after being welded with a metal sheet; a prismatic structure is provided in the middle of the double-headed screw.

[0012] After the main layer insulation module is placed, the lower metal plate, disc spring and locking cap are placed in sequence on the fixed pad in the installation notch formed on the main layer insulation layer. The center of the locking cap is provided with a through threaded hole for fixedly connecting to the connecting rod in the lower end cap rod structure. The upper end of the locking cap is provided with a perforated boss extending outward from the locking cap and configured to compress the disc spring sleeved on the locking cap after locking. The locking plate is arranged on the perforated boss. The bridge block is arranged in a rectangular shape, and stepped through holes for installing long bolts are provided at the four corners. The stepped through holes are provided with inner grooves for accommodating springs and limiting the falling of the springs. After the long bolts are connected to the fixed connection holes provided at the four corners of the lower metal plate, the long bolts are tightened by a controllable torque tooling device so that the long bolts are tightened to a preset torque value range. The bridge block presses the locking plate and can limit the rotation of the locking plate.

[0013] In some embodiments of the present application, the bridge block is made of solid wood or other non-metallic material with rigidity and excellent thermal insulation properties. The bridge block is arranged in a rectangular shape, and bridging legs are extended downward at the four corners of the lower surface facing the lower metal plate side. A door groove is formed between two adjacent bridging legs, and stepped through holes are respectively arranged in the middle of the four bridging legs; the upper metal plate is located above the bridge block, and a through hole is provided at a position corresponding to the stepped through hole in the bridge block, and a gasket is provided in the through hole of the upper metal plate, the diameter of the long bolt is smaller than the inner ring diameter of the spring, and the outer ring diameter of the gasket is equal to the outer diameter of the spring; in summary, the bridge block, spring, gasket and upper metal plate can be fixed to the lower metal plate by long bolts.

[0014] The locking plate is arranged in a cross shape, and each end is clamped in the door groove of the bridge block; the central aperture of the disc spring is larger than the diameter of the locking cap, and the central aperture of the lower end metal plate is larger than the diameter of the locking cap and smaller than the central aperture of the disc spring.

[0015] The welding base is cylindrical, and an outward extending edge for welding and fixing to the hull structure is formed at the bottom welded to the hull structure away from the center line of the welding base, thereby facilitating the welding and fixing of the welding base to the hull structure. The bottom of the welding base is provided with an inwardly concave inner groove, and a nut is provided in the inner groove for fixed connection to the metal connecting rod.

[0016] A trumpet-shaped chamfered groove is provided on the top of the welding base to enable the metal connecting rod to swing within a set range.

[0017] In some embodiments of the present application, the sub-layer insulation layer through which the upper end of the lower metal connecting rod passes includes a sub-layer insulation module in the planar area of ​​the sub-layer insulation layer, a dihedral angle area sub-layer planar transition module in the two-sided area, and a trihedral angle area sub-layer planar transition module in the three-sided area.

[0018] In some embodiments of the present application, the cap rod structure includes a cylindrical cap, which is connected to the lower end welding metal gasket and has an outer extending edge formed on the side away from the center line of the cylindrical cap for welding and fixing with the lower end welding metal gasket. The lower end welding metal gasket is embedded in the top plate of the secondary insulation module, and the cylindrical cap and the lower end welding metal gasket are fixed by welding or bonding.

[0019] The thread on the cylindrical cap of the lower end cap rod structure is arranged in a thread groove provided at its lower end. A reserved space is reserved in the thread groove for tolerance adjustment of the through fastener. The reserved space is the space with threads remaining in the thread groove after the cylindrical cap and the upper end of the metal connecting rod are threadedly connected to the installation position.

[0020] The upper part of the cylindrical cap of the lower end cap rod structure is provided with a prismatic structure which can facilitate the tooling to tighten the cylindrical cap.

[0021] In some embodiments of the present application, a prismatic structure is provided in the middle of the double-headed screw for facilitating the tightening of the tooling during installation. The double-headed screw has threads at both ends, and the threads at the lower end of the double-headed screw are fixedly connected to the center hole of the upper metal plate.

[0022] After the through-fastener is installed, there is a gap of 3-10 mm between the lower end of the stud screw and the upper end of the lower end cap rod structure.

[0023] In some embodiments of the present application, after the stud screw is threadedly connected to the upper metal plate, the upper end screw portion of the stud screw passes through the mounting hole of the straight-shaped fastening card plate or the cross-shaped fastening card plate on the upper part of the main layer insulation layer module and the upper end welding metal sheet;

[0024] The metal sealing cap is locked on the upper end thread of the double-headed screw and locked to a preset torque range. The lower edge of the metal sealing cap extends outward to form an outer edge. The lower edge of the metal sealing cap is welded and fixed to the upper end welding metal sheet. The upper end of the metal sealing cap is provided with an inward concave prismatic groove for locking.

[0025] In some embodiments of the present application, the lower metal plate, disc spring, locking cap, locking plate, spring and upper metal plate of the through-fastener are all made of stainless steel or Invar steel, or other low-temperature resistant rigid metal materials.

[0026] In some embodiments of the present application, the through fastener penetrates the hull structure, the secondary insulation layer module, the secondary film layer, the main insulation layer module, and the main film layer are fixed in series in the normal direction of the hull structure.

[0027] In some embodiments of the present application, the through fasteners are arranged at the center of the planar area sub-layer insulation layer module, the planar area main layer insulation layer module and the planar area sub-layer insulation layer module are staggered, and the through fasteners have elastic compression blocks fastened at the edge of the planar area main layer insulation layer module.

[0028] In some embodiments of the present application, the through fastener arrangement point is set at the center of the planar area secondary insulation layer module, and the planar area main insulation layer module and the planar area secondary insulation layer module are staggered.

[0029] In some embodiments of the present application, when the compression block is fixedly connected to the middle plate provided on the main layer insulation module, the corresponding main layer insulation module includes:

[0030] The main layer insulation module in the plane area of ​​the main layer insulation layer, the dihedral corner area main layer insulation module in the two-sided area, and the trihedral corner area main layer insulation module in the three-sided area

[0031] Compared to the prior art, the beneficial effects of the through-fasteners in the membrane enclosure system provided in the embodiments of the present application are as follows: the through-fasteners sequentially connect and secure the enclosure structure's secondary insulation layer, secondary membrane layer, primary insulation layer, and primary membrane layer from the bulkhead into the cabin. The primary and secondary insulation layers and primary and secondary membrane layers are securely connected to the hull structure at each through-fastener location, enhancing the overall stability of the enclosure structure and its reliability against liquid cargo sloshing. Furthermore, since both the primary and secondary membrane layers are connected to the through-fasteners, the tongue-type connection method is eliminated, making construction more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] FIG1 is a schematic diagram showing the location of through-fasteners for a membrane-type enclosure system according to an embodiment of the present application;

[0033] FIG2 is a schematic diagram of the installation of a through-fastener for a membrane-type enclosure system in an enclosure structure according to an embodiment of the present application;

[0034] FIG3 is an axonometric diagram of a through-fastener for a membrane-type enclosure system provided in an embodiment of the present application;

[0035] FIG4 is a bottom view of a through-fastener for a membrane-type enclosure system provided in an embodiment of the present application;

[0036] FIG5 is a schematic axial cross-sectional view of a through-fastener for a membrane-type enclosure system in an enclosure structure provided by an embodiment of the present application.

[0037] Description of the drawings: 1. Welding base; 1a. Rounded mouth; 2. Nut; 3. Metal connecting rod; 3a. Chamfered thread; 4. Lower end welding metal sheet; 10. Lower section; 11. Lower end cap rod structure; 11a. Prismatic structure; 11b. Connecting rod; 12. Lower end metal plate; 13. Bridge block; 14. Upper end metal plate; 15. Disc spring; 16. Locking cap; 17. Locking plate; 18. Spring; 19. Long bolt; 20. Gasket; 21. Double-headed screw; 22. Metal sealing cap; 24. Upper end welding metal sheet; 25. Upper section; 28. Through fastener; 30. Through fastener distribution position; 31. Secondary insulation layer module; 32. Secondary film layer; 33. Main insulation layer module; 34. Main film layer; 35a. I-shaped fastening card; 35b. Cross-shaped fastening card. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is described in detail below with reference to the accompanying drawings and specific implementation methods.

[0039] Various aspects and features of the present application are described herein with reference to the accompanying drawings.

[0040] These and other characteristics of the present application will become apparent from the following description of a preferred form of embodiment given as a non-limiting example with reference to the accompanying drawings.

[0041] It should also be understood that although the present application has been described with reference to certain specific examples, those skilled in the art will be able to implement many other equivalent forms of the present application that have the features described in the claims and are therefore within the scope of protection defined thereby.

[0042] The above and other aspects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0043] Specific embodiments of the present application will be described below with reference to the accompanying drawings; however, it should be understood that the embodiments described are merely examples of the present application and may be implemented in a variety of ways. Familiar and / or repetitive functions and structures are not described in detail to clarify the true intent based on the user's historical operations and to avoid obscuring the present application with unnecessary or redundant details. Therefore, the specific structural and functional details described herein are not intended to be limiting, but rather serve merely as a basis and representative basis for the claims to teach those skilled in the art to use the present application in a variety of ways with substantially any appropriate detailed structure.

[0044] This specification may use the phrases "in one embodiment," "in another embodiment," "in a further embodiment," or "in other embodiments," which may all refer to one or more of the same or different embodiments according to the present application.

[0045] The embodiment of the present application provides a through fastener 28 for a membrane-type enclosure system, as shown in Figures 1 to 5. The membrane-type enclosure system is used to accommodate ultra-low temperature media, including a main membrane layer 34, a fastening card, a main insulation layer, a secondary membrane layer 32 and a secondary insulation layer that are sequentially connected and fixed to the hull structure through the through fastener. The main membrane layer, the main insulation layer, the secondary membrane layer and the secondary insulation layer enclose a cryogenic liquid cargo storage tank for accommodating ultra-low temperature media; wherein the through fastener 28 includes: an upper section 25 and a lower section 10, specifically,

[0046] The lower section 10 includes a welding base 1 and a metal connecting rod 3 with threads at both ends. The welding base 1 is welded to the bulkhead of the hull structure according to the markings. The welding base 1 contains a nut 2. The lower end of the metal connecting rod 3 is fixedly connected to the nut 2 in the welding base 1, and the upper end is set through the secondary insulating layer. The metal connecting rod 3 is provided with a chamfered thread 3a at the position where it passes through the upper part of the secondary insulating layer to facilitate tightening the metal connecting rod 3, thereby facilitating tightening and fixing using a torque tool.

[0047] Upper section 25 includes a lower cap rod structure 11, a lower metal plate 12, a bridge block 13, an upper metal plate 14, a disc spring 15, a locking cap 16, a locking plate 17, four springs 18, four long bolts 19, four washers 20, a stud screw 21, and a metal sealing cap 22. Lower cap rod structure 11 is composed of a prismatic structure 11a and a connecting rod 11b. Prismatic structure 11a in lower cap rod structure 11 is fixedly connected to the chamfered threads 3a at the upper end of metal connecting rod 3. Lower cap rod structure 11 is pressed tightly against lower welded metal sheet 4, located above the secondary insulation module 31. The boss edge at the lower end of lower cap rod structure 11 is welded to lower welded metal sheet 4 for a seal.

[0048] The lower end metal plate 12 is arranged on a fixed pad fixedly connected to the middle plate of the main layer insulation module 33. The upper end of the double-headed screw 21 passes through the upper end of the center hole of the I-shaped fastening card 35a or the cross-shaped fastening card 35b set at the top of the main layer insulation layer module 33, and is fixedly connected to the metal sealing cap 22 after being welded to the upper end of the metal sheet 24; a prismatic structure is provided in the middle of the double-headed screw 21.

[0049] After the main layer insulation module 33 is placed, the lower metal plate 12, disc spring 15 and locking cap 16 are placed in sequence on the fixed pad in the installation notch formed on the main layer insulation layer. The center of the locking cap 16 is provided with a through threaded hole for fixed connection with the connecting rod 11b in the lower end cap rod structure 11. The upper end of the locking cap 16 is provided with a perforated boss extending outward from the locking cap for pressing the disc spring 15 sleeved on the locking cap 16 after locking. The locking plate 17 is provided on the perforated boss. On the platform, the bridge block 13 is arranged in a rectangular shape, and has stepped through holes for installing long bolts 19 at the four corners. The stepped through holes are provided with inner grooves for accommodating springs 18 and limiting the falling of the springs 18. After the long bolts 19 are connected to the fixed connection holes opened at the four corners of the lower end metal plate 12, the long bolts 19 are tightened by a controllable torque tooling device so that the long bolts 19 are tightened to a preset torque value range. The bridge block 13 presses the locking plate 17 and can limit the rotation of the locking plate.

[0050] In this embodiment, the bridge block 13 is made of solid wood or other non-metallic material with rigidity and excellent thermal insulation performance. The bridge block 13 is arranged in a rectangular shape, and bridging legs are extended downward at the four corners of the lower surface facing the lower end metal plate 12. A door groove is formed between two adjacent bridging legs, and stepped through holes are respectively arranged in the middle of the four bridging legs; the upper end metal plate 14 is located above the bridge block 13, and a through hole is provided at a position corresponding to the stepped through hole in the bridge block 13, and a gasket 20 is provided in the through hole of the upper end metal plate 14, the diameter of the long bolt 19 is smaller than the inner ring diameter of the spring 18, and the outer ring diameter of the gasket 20 is equal to the outer diameter of the spring 18; in summary, the bridge block 13, the spring 19, the gasket 20 and the upper end metal plate 14 can be fixed to the lower end metal plate 12 by the long bolt 19.

[0051] The locking plate 17 is arranged in a cross shape, and each end is clamped in the door groove of the bridge block 13; the central aperture of the disc spring 15 is larger than the diameter of the locking cap 16, and the central aperture of the lower end metal plate 12 is larger than the diameter of the locking cap 16 and smaller than the central aperture of the disc spring 15.

[0052] After the main layer insulation module 33 is placed at the installation position, the lower metal plate 12, disc spring 15 and locking cap 16 are placed in the compression position of the main layer insulation module 33 in sequence. The center of the locking cap 16 is provided with a through threaded hole, and the upper end is provided with a boss with a hole. The boss can be hexagonal or octagonal. The cylindrical diameter of the locking cap 16 is smaller than the parallel side distance of the boss, and it is an integrated structure, which can realize the compression of the disc spring 15 through the boss. The central aperture of the disc spring 15 is larger than 1-1.3 times the outer diameter of the locking cap 16. The central aperture of the lower metal plate 12 is larger than the diameter of the locking cap 16 and smaller than the central aperture of the disc spring 15, so that the lower end cap body of the locking cap 16 can pass through the central hole of the lower metal plate 12, and the disc spring 15 is stuck in the upper part of the central hole of the lower metal plate 12.

[0053] Then, place the locking plate 17 on the upper end of the locking cap 16, buckle the bridge block 13, and the four ends (protruding edges) of the locking plate 17 are stuck in the door grooves in the four directions of the bridge block 13 to prevent the locking cap 16 and the locking plate 17 from rotating and loosening; place the upper metal plate 14 on the upper part of the bridge block 13. The upper metal plate 14 has through holes at the four corners, and there is an inner groove under each through hole that is one circle larger than the hole to match the diameter of the spring 18. There are stepped through holes at the four corners of the bridge block 13 to place the spring 18 and the long bolt 19. After the spring 18 is placed, it cannot leak down, so that in the compressed state, the spring 18 directly contacts the lower metal plate 12. The outer diameter of the spring 18 is controlled to be slightly smaller than the diameter of the through holes at the four corners of the bridge block 13, and the diameter of the long bolt 19 is smaller than the inner circle diameter of the spring 18. The lower thread of the long bolt 19 matches the screw holes at the four corners of the lower metal plate 12.

[0054] After the spring 18 is placed, the upper metal plate 14 is placed on the bridge block 13, with the through-holes at the four corners of the upper metal plate 14 corresponding to the stepped through-holes of the bridge block 13. The gasket 20 is then inserted into the through-holes of the upper metal plate 14. The long bolts 19 can then be tightened using a torque-controlled fixture. The tightening sequence can begin with any long bolt 19, then tighten the diagonal bolts of the first tightening bolt, and then secure the bolts in the other two directions. This sequence is repeated multiple times until the bolts reach the preset torque range. At this point, the primary insulation module 33 and the secondary insulation module 31 are secured to the hull bulkhead.

[0055] In some embodiments of the present application, the welding base 1 is cylindrical, and an outwardly extending edge for welding and fixing to the hull structure is formed at the bottom welded to the hull structure away from the center line of the welding base 1, thereby facilitating the welding and fixing of the welding base to the hull structure. The bottom of the welding base is provided with an inwardly concave inner groove, and a nut 2 for fixedly connecting to the metal connecting rod 3 is provided in the inner groove. The inner groove and the nut 2 can both be prismatic, such as a hexagonal prism or an octagonal prism, etc. Of course, other shapes are also possible.

[0056] A trumpet-shaped chamfered groove (chamfered opening 1 a ) is provided on the top of the welding base 1 so that the metal connecting rod 3 can rock within a set range.

[0057] In some embodiments of the present application, not shown, the inner groove of the welding base 1 and the nut 2 are both hemispherical structures. A retaining rib is provided on the inner side of the inner groove to prevent the nut 2 from rotating. The retaining rib may be at least one. The nut 2 is provided with a threaded central hole, and a retaining groove is provided on the outer circumference of the hemispherical structure of the nut 2 to match the retaining rib. The width of the retaining groove is 2-5 mm greater than the width of the retaining rib, so that the nut 2 can swing within a set range. After the metal connecting rod 3 is tightened, the hemispherical nut 2 is driven to achieve a limited swing amplitude. The retaining groove prevents the hemispherical nut 2 from falling off the welding base 1. This is more adaptable to the deformation of the insulation layer under various load superposition conditions, and the nut can swing freely within a limited range and easily recover after the load is removed.

[0058] Furthermore, in this embodiment, the sub-layer insulation layer through which the upper end of the lower metal connecting rod 3 passes includes a sub-layer insulation module 31 in the planar area of ​​the sub-layer insulation layer, a dihedral angle area sub-layer planar transition module in the two-sided area, and a trihedral angle area sub-layer planar transition module in the three-sided area.

[0059] In some embodiments of the present application, the lower end cap rod structure 11 includes a cylindrical cap, which is connected to the lower end welding metal gasket 4 and has an outer extending edge formed on the side away from the center line of the cylindrical cap for welding and fixing with the lower end welding metal gasket 4. The thickness is not less than 1 mm and not more than 5 mm to achieve a better welding sealing effect. The lower end welding metal gasket 4 is embedded in the top plate of the secondary insulation module 31. The cylindrical cap and the lower end welding metal gasket 4 are fixed by welding or bonding.

[0060] The threads on the cylindrical cap of the lower end cap rod structure 11 are arranged in a thread groove provided at its lower end. The thread groove reserves a reserved space for adjusting the tolerance of the through fasteners. The reserved space is the space with threads remaining in the thread groove after the cylindrical cap and the upper end of the metal connecting rod 3 are threadedly connected to the installation position. That is, the thread groove length still has a depth of 5mm in the standard installation state, which is convenient for adjusting the tolerance of the 28 through fasteners.

[0061] The upper part of the cylindrical cap of the lower end cap rod structure 11 is provided with a prismatic structure 11a, such as a hexagonal prism or an octagonal prism, which can facilitate the tooling to tighten the cylindrical cap. Of course, it can also be other prismatic structures 11a that are convenient for tightening operations, so that the tooling can be tightened and installed conveniently. Among them, the upper end of the prismatic structure 11a is a connecting rod 11b with a thread on the top, and the cylindrical cap, prismatic structure 11a and connecting rod 11b can be an integrated structure.

[0062] In some embodiments of the present application, a prism structure is provided in the middle part of the double-headed screw 21 for facilitating the tightening of the tooling during installation. Specifically, it can be a hexagonal prism or an octagonal prism to facilitate the installation of the tooling. Both ends are threaded, and the threads at the lower end of the double-headed screw 21 are fixedly connected to the center hole of the upper metal plate 14. After the through-fastener 28 is installed, there is a gap of 3-10 mm between the lower end of the double-headed screw 21 and the upper end of the lower end cap rod structure 11, thereby achieving a heat transfer isolation effect, so that the low temperature of the liquid cargo in the cargo hold is conducted to the upper metal plate 14 and then needs to pass through the bridge block 13 with a heat insulation function before continuing to be transmitted downward.

[0063] In this embodiment, the double-headed screw 21 is threadedly connected to the upper metal plate 14, and the lower end of the double-headed screw 21 at least partially extends out of the upper metal plate 14, and the upper end screw portion of the double-headed screw 21 passes through the mounting hole of the I-shaped fastening clamp 35a or the cross-shaped fastening clamp 35b on the upper part of the main layer insulation layer module 33 and the upper end welding metal sheet 24; the metal sealing cap 22 is locked on the upper end thread of the double-headed screw 21 and locked to a preset torque range, and the lower edge of the metal sealing cap 22 extends outward to form an outer edge, and the lower edge of the metal sealing cap 22 is welded and fixed to the upper end welding metal sheet 24, and the upper end of the metal sealing cap 22 is provided with an inward concave prismatic groove for locking, which can be a concave hexagonal, octagonal, or other alternative structure that can facilitate the locking operation.

[0064] In some embodiments of the present application, the through fasteners 28 are arranged at the center of the planar area secondary insulation layer module 31, and the planar area main insulation layer module 33 and the planar area secondary insulation layer module 31 are staggered.

[0065] The above embodiments are merely exemplary embodiments of the present application and are not intended to limit the scope of the present application. The scope of protection of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and scope of protection of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the scope of protection of the present application.

Claims

1. A through fastener for a membrane type enclosure system, characterized in that: The membrane type containment system is used to contain ultra-low temperature media, and includes a primary membrane layer, a fastening card plate, a primary insulating layer, a secondary membrane layer and a secondary insulating layer which are sequentially connected and fixed to the hull structure through penetrating fasteners; wherein the penetrating fasteners include: an upper section and a lower section, specifically, The lower section includes a welding base and a metal connecting rod with threads at both ends. The welding base is welded and fixed to the bulkhead of the hull structure according to the markings. The welding base contains a nut. The lower end of the metal connecting rod is fixedly connected to the nut in the welding base, and the upper end is arranged through the secondary insulating layer. The metal connecting rod is provided with a chamfered thread at the position where it passes through the upper part of the secondary insulating layer to facilitate tightening the metal connecting rod. The upper section includes a lower end cap rod structure, a lower end metal plate, a bridge block, an upper end metal plate, a disc spring, a locking cap, a locking plate, four springs, four long bolts, four gaskets, a double-headed screw and a metal sealing cap; the lower end cap rod structure is fixedly connected to the upper end of the metal connecting rod, and the lower end cap rod structure is tightly pressed on the lower end welding metal sheet set on the upper part of the secondary insulation module, and the boss edge of the lower end of the lower end cap rod structure is welded and sealed with the lower end welding metal sheet; The lower end metal plate is arranged on a fixed pad fixedly connected to the middle plate of the main layer insulation layer module, and the upper end of the double-headed screw passes through the upper end of the center hole of the I-shaped fastening card plate or the cross-shaped fastening card plate arranged on the top of the main layer insulation layer module, and is fixedly connected to the metal sealing cap after being welded to the upper end of the metal sheet; a prismatic structure is arranged in the middle of the double-headed screw; After the main layer insulation module is placed, the lower end metal plate, disc spring and locking cap are placed in sequence on the fixed pad block in the installation notch formed on the main layer insulation layer, and the center of the locking cap is provided with a through threaded hole for fixedly connecting with the connecting rod in the lower end cap rod structure, and the upper end of the locking cap is provided with a perforated boss extending outward from the locking cap and arranged to compress the disc spring sleeved on the locking cap after locking. The locking plate is arranged on the perforated boss, and the bridge block is arranged in a rectangular shape, and stepped through holes for installing long bolts are provided at the four corners, and an inner groove for accommodating the spring and limiting the spring from falling is provided in the stepped through hole. After the long bolt is connected with the fixed connecting holes provided at the four corners of the lower end metal plate, the long bolt is tightened by a controllable torque tooling equipment so that the long bolt is tightened to a preset torque value range, and the bridge block presses the locking plate and can limit the rotation of the locking plate.

2. The through-fastener of the membrane type enclosure system according to claim 1, characterized in that: The bridge block is made of solid wood or other non-metallic materials with rigidity and excellent thermal insulation performance. The bridge block is arranged in a rectangular shape, and has bridging legs extending downward at the four corners of the lower surface facing the lower end metal plate side, and a door slot is formed between two adjacent bridging legs. The stepped through holes are respectively arranged in the middle of the four bridging legs; the upper end metal plate is located above the bridge block, and has through holes corresponding to the stepped through holes in the bridge block, and gaskets are arranged in the through holes of the upper end metal plate; The diameter of the long bolt is smaller than the inner diameter of the spring, and the outer diameter of the gasket is equal to the outer diameter of the spring; The locking plate is arranged in a cross shape, and each end is clamped in the door groove of the bridge block; The central hole diameter of the disc spring is larger than the diameter of the locking cap, and the central hole diameter of the lower end metal plate is larger than the diameter of the locking cap and smaller than the central hole diameter of the disc spring.

3. The through-fastener of the membrane type enclosure system according to claim 1, characterized in that: The welding base is cylindrical, and an outer extending edge for welding and fixing with the hull structure is formed at the bottom welded with the hull structure away from the center line of the welding base, so as to facilitate the welding and fixing of the welding base and the hull structure. The bottom of the welding base is provided with an inner groove concave inwardly, and a nut for fixed connection with the metal connecting rod is arranged in the inner groove; A trumpet-shaped chamfered groove is provided on the top of the welding base so that the metal connecting rod can swing within a set range.

4. The through-fastener of the membrane type enclosure system according to claim 1, characterized in that: The secondary insulating layer through which the upper end of the lower metal connecting rod passes includes a secondary insulating module in the plane area of ​​the secondary insulating layer, a dihedral angle area secondary planar transition module in the two-sided area, and a trihedral angle area secondary planar transition module in the three-sided area.

5. The through-fastener of the membrane type enclosure system according to claim 1, characterized in that: The cap rod structure includes a cylindrical cap, which is connected to the lower end welding metal gasket and has an outer extending edge formed on the side away from the center line of the cylindrical cap for welding and fixing with the lower end welding metal gasket. The lower end welding metal gasket is embedded in the top plate of the secondary insulation module. The cylindrical cap and the lower end welding metal gasket are fixed by welding or bonding. The thread on the cylindrical cap of the lower end cap rod structure is arranged in a thread groove arranged at the lower end thereof, and a reserved space for adjusting the tolerance of the through fastener is reserved in the thread groove, and the reserved space is the space with thread remaining in the thread groove after the cylindrical cap and the upper end of the metal connecting rod are threadedly connected to the installation position; The upper part of the cylindrical cap of the lower end cap rod structure is provided with a prismatic structure which can facilitate the tooling to tighten the cylindrical cap.

6. The through-fastener of the membrane type enclosure system according to claim 2, characterized in that: The middle part of the double-headed screw is provided with a prismatic structure for facilitating the tightening of the tooling during installation, and both ends of the double-headed screw are threaded, and the thread at the lower end of the double-headed screw is fixedly connected to the central hole of the upper metal plate; After the through fastener is installed, there is a gap of 3-10 mm between the lower end of the double-headed screw and the upper end of the lower end cap rod structure.

7. The through-fastener of the membrane type enclosure system according to claim 6, characterized in that: After the double-headed screw is threadedly connected to the upper metal plate, the upper end screw portion of the double-headed screw passes through the main layer. The mounting holes of the straight-shaped fastening card plate or the cross-shaped fastening card plate on the upper part of the insulating layer module and the upper end welding metal sheet; The metal sealing cap is locked on the upper end thread of the double-headed screw and locked to a preset torque range. The lower edge of the metal sealing cap extends outward to form an outer edge. The lower edge of the metal sealing cap is welded and fixed to the upper end welding metal sheet. The upper end of the metal sealing cap is provided with an inwardly concave prismatic groove for locking.

8. The through-fastener of the membrane type enclosure system according to claim 1, characterized in that: The lower metal plate, disc spring, locking cap, locking plate, spring and upper metal plate of the through-fastener are all made of stainless steel or invar steel, or other low-temperature-resistant rigid metal materials.

9. The through-fastener of the membrane type enclosure system according to claim 1, characterized in that: The through fastener penetrates the hull structure, the secondary insulating layer module, the secondary thin film layer, the main insulating layer module, and the main thin film layer are fixed in series in the normal direction of the hull structure.

10. The membrane type enclosure system according to claim 1, characterized in that: The through fasteners are arranged at the center of the plane area secondary insulation layer module, the plane area main insulation layer module and the plane area secondary insulation layer module are staggered, and the through fasteners have elastic clamping blocks fastened at the edge of the plane area main insulation layer module.

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