A liquid cargo tank insulation system

Abstract

The present invention provides a thermal insulation system for a liquid cargo tank, which includes an elastic support sheet arranged on the outside of the liquid cargo tank shell, the elastic support sheet is a stainless steel metal sheet, the raised isolation cover part thereof is circular, and the middle circular plate area is installed with fastening bolts to connect with the liquid cargo tank shell. One side of the elastic support sheet contacts with the first thermal insulation board, and the other side contacts with the second thermal insulation board and the third thermal insulation board, so as to effectively transfer the heat load, and maintain a connection relationship with each thermal insulation board to improve stability. A pad is welded on the surface of the liquid cargo tank shell, one end of the fastening bolt is connected to the pad by butt welding, and the other end is connected to the elastic support sheet by a nut. When the butt welding has quality problems, re-butt welding will not cause damage to the liquid cargo tank shell. The thermal insulation system has a good thermal insulation effect, and there are gaps between the layers of thermal insulation boards, which avoids stress deformation caused by thermal expansion and contraction, and can allow a certain construction accuracy deviation, reducing the difficulty of construction.

Description

Technical Field

[0001] The invention relates to the field of shipbuilding, and in particular to a thermal insulation system for a liquid cargo tank. Background Art

[0002] When a liquefied gas ship is transporting cryogenic liquid cargo at sea, when using a Type B independent liquid cargo tank, its surface is required to be covered with a certain thickness of insulation layer and leakage channel to prevent the temperature of the ship structure from dropping to an unsafe level and to limit the heat flow entering the liquid cargo tank to a level that can be maintained by the pressure and temperature control system.

[0003] The insulation layer is also called the thermal insulation system. At present, there are many thermal insulation system design schemes for type B independent liquid cargo tanks in the shipbuilding industry, each with its own advantages and disadvantages. The design of the thermal insulation system must consider two key issues: 1) The thermal stress safety of the insulation board caused by thermal expansion and contraction (loading and unloading, etc.) due to large temperature differences at ultra-low temperatures; 2) The problem of excessive deformation caused by construction accuracy deviation (unevenness of the liquid tank surface, etc.) affecting the installation and use of the insulation board. The present invention focuses on the above two issues and proposes an effective solution. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the present invention provides a liquid cargo tank insulation system, the insulation system comprising:

[0005] Cargo tank hulls;

[0006] The elastic support sheet includes a truncated cone-shaped isolation cover and a support plate connected to the outer edge of the isolation cover, the outer edge of the support plate is square, the isolation cover includes a circular plate and a conical surface connected to the outer edge of the circular plate, the circular plate and the conical surface form an inner cavity, and the circular plate is parallel to the support plate;

[0007] The circular plate is arranged parallel to the liquid cargo tank shell with the inner cavity facing outward, a gap is left between the circular plate and the liquid cargo tank shell as a leakage channel, and the first insulation plate is attached to the surface of the liquid cargo tank shell and fills the gap between the conical surfaces of adjacent elastic support sheets.

[0008] Preferably, the second insulation board fills the inner cavity and protrudes outward from the inner cavity, the portion of the second insulation board protruding from the inner cavity is circular and covers a partial area of ​​the support plate, and a gap is left between the second insulation board and the conical surface of the elastic support plate.

[0009] Preferably, the third thermal insulation board covers a portion of the second thermal insulation board away from the outer surface of the liquid cargo tank shell, and fills the gaps between adjacent second thermal insulation boards.

[0010] Preferably, the portion of the third thermal insulation board that fills the gap between adjacent second thermal insulation boards is in contact with the support plate and is separated from the first thermal insulation board by the support plate.

[0011] Preferably, the gap between adjacent third insulation boards is located in the central area of ​​the second insulation board and is filled with glass wool, and a tape covering the glass wool is pasted on the gap between adjacent third insulation boards.

[0012] Preferably, a gap is left between the portion of the third insulation board that fills the gap between the adjacent second insulation boards and the second insulation board, and the gap is filled with polyurethane filler.

[0013] Preferably, the elastic support sheet is connected to the liquid cargo tank shell by fastening bolts penetrating the circular plate.

[0014] Preferably, a pad is welded on the surface of the liquid cargo tank shell as a positioning mark for the fastening bolt, one end of the fastening bolt is connected to the pad by butt welding, and the other end is connected to the elastic support sheet by a nut.

[0015] Preferably, a side of the first insulation plate in contact with the cargo tank shell is provided with a plurality of grooves serving as leakage channels.

[0016] Preferably, the surface of the third insulation board away from the cargo tank shell is a plane or a non-plane. The third insulation board with a plane surface is used for the top surface of the cargo tank shell, and the third insulation board with a non-plane surface is used for the side and bottom surfaces of the cargo tank shell.

[0017] As described above, the present invention provides a thermal insulation system for a liquid cargo tank, which includes an elastic support sheet arranged on the outside of the liquid cargo tank shell, the elastic support sheet is a stainless steel metal sheet, the raised isolation cover portion thereof is circular, and the middle circular plate area is installed with 4 fastening bolts to connect with the liquid cargo tank shell; the non-raised portion thereof is square. One side of the elastic support sheet contacts the first thermal insulation plate, and the other side contacts the second thermal insulation plate and the third thermal insulation plate. Since the elastic support sheet is in non-rigid contact with other structures and is a non-planar structure itself, it can produce elastic deformation under ultra-low temperature changes, and effectively transfer heat loads at the same time, maintain a connection relationship with each thermal insulation plate, and improve stability. Furthermore, the elastic support sheet is connected to the liquid cargo tank shell by fastening bolts penetrating the circular plate, and a pad is welded on the surface of the liquid cargo tank shell as a positioning mark for the fastening bolts. One end of the fastening bolt is connected to the pad by a butt welding method, and the other end is connected to the elastic support sheet by a nut. When there is a quality problem in the butt welding, the fastening bolts can be cut off first, and then the surface of the pad can be polished, and the fastening bolts can be re-welded in the original position without causing damage to the liquid cargo tank shell. The insulation system has a good thermal insulation effect. At the same time, due to the certain gaps between the layers of insulation boards, the stress deformation caused by thermal expansion and contraction is avoided. At the same time, a certain construction accuracy deviation can be allowed, reducing the difficulty of construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1Shown is a schematic structural diagram of the thermal insulation system of the present invention.

[0019] Figure 2 It is a schematic diagram of the cross-sectional structure of the elastic supporting sheet in the present invention.

[0020] Figure 3 It is a schematic diagram of the top view of the elastic support sheet in the present invention.

[0021] Figure 4 It is a schematic structural diagram showing the application of the thermal insulation system of the present invention to the top surface of the liquid cargo tank shell.

[0022] Component number description

[0023] 1 Cargo tank shell

[0024] 2 Leakage channels

[0025] 301 Block

[0026] 302 Fastening bolts

[0027] 303 elastic support sheet

[0028] 304 First insulation board

[0029] 305 Second insulation board

[0030] 306 Third insulation board

[0031] 307 Polyurethane Filler

[0032] 308 Glass Wool

[0033] 309 Tape

[0034] 3031 Round Plate

[0035] 3032 Conical surface

[0036] 3033 Pallet DETAILED DESCRIPTION

[0037] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0038] For example, when describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional view showing the device structure will not be partially enlarged according to the general scale, and the schematic view is only an example, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional space dimensions of length, width and depth should be included.

[0039] For ease of description, spatial relational terms such as "under", "below", "below", "below", "above", "on", etc. may be used herein to describe the relationship of one element or feature shown in the drawings to other elements or features. It will be understood that these spatial relational terms are intended to include other directions of the device in use or operation in addition to the directions depicted in the drawings. In addition, when a layer is referred to as being "between" two layers, it can be the only layer between the two layers, or there can be one or more intervening layers. As used herein, "between..." means including the end point values.

[0040] In the context of the present application, a structure in which a first feature is described as being "above" a second feature may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact.

[0041] It should be noted that the illustrations provided in this embodiment are only used to illustrate the basic concept of the present invention in a schematic manner, and therefore the illustrations only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0042] like Figures 1 to 3 As shown, the present invention provides a liquid cargo tank insulation system, comprising

[0043] Cargo tank shell 1;

[0044] The elastic support sheet 303 includes a truncated cone-shaped isolation cover and a support plate 3033 connected to the outer edge of the isolation cover. The outer edge of the support plate 3033 is square. The isolation cover includes a circular plate 3031 and a conical surface 3032 connected to the outer edge of the circular plate 3031. The circular plate 3031 and the conical surface 3032 form an inner cavity. The circular plate 3031 is parallel to the support plate 3033.

[0045] Further, the circular plate 3031 is arranged parallel to the cargo tank shell 1 with the inner cavity facing outward, a gap is left between the circular plate 3031 and the cargo tank shell 1 as a leakage channel 2, the first insulation board 304 is attached to the surface of the cargo tank shell 1 and fills the gap between the conical surfaces 3032 of the adjacent elastic support sheets 303; more specifically, the surface of the first insulation board 304 away from the cargo tank shell 1 is in contact with the support plate for fixing. The relatively large edge of the conical surface is away from the cargo tank shell 1.

[0046] Furthermore, the second insulation board 305 fills the inner cavity and protrudes outward from the inner cavity. The portion of the second insulation board 305 protruding from the inner cavity is circular and covers a partial area of ​​the support plate. A gap is left between the second insulation board 305 and the conical surface of the elastic support sheet 303.

[0047] Furthermore, the third insulation board 306 covers part of the outer surface of the second insulation board 305 and fills the gap between the adjacent second insulation boards 305. The gap between the adjacent third insulation boards 306 is located in the central area of ​​the second insulation board 305 and is filled with glass wool 308. The gap between the adjacent third insulation boards 306 is pasted with a tape 309 covering the glass wool 308. The part of the third insulation board 306 that fills the gap between the adjacent second insulation boards 305 is in contact with the support plate and is separated from the first insulation board 304 by the support plate. The main function of the glass wool 308 here is to maintain elasticity, and the surface of the connection is provided with a tape 309 to play a sealing and protective role. This design makes the connection between the third insulation board 306 in the outermost layer non-"hard" connection under the conditions of elasticity and tightness. Considering that the outer third insulation board 306 is inevitably damaged during construction and operation and needs to be replaced and repaired, this design scheme can replace the damaged third insulation board 306 very flexibly. It should be understood that the gap between the adjacent second insulation plates 305 is located outside the support plate 3033, or in other words, the gap is formed between the parts of the adjacent second insulation plates 305 protruding outward from the inner cavity.

[0048] The main material of each insulation board can be insulation materials such as polyurethane (PU) or polystyrene (EPS). The insulation board has the excellent characteristic of low thermal conductivity and is an excellent material for heat preservation and insulation; it also has the characteristics of low density, light weight, good aging resistance, etc. In addition, it also has high tensile strength, low elastic modulus, and low thermal expansion coefficient, making it more resistant to thermal deformation and cracking.

[0049] Specifically, the elastic support sheet 303 is a stainless steel metal sheet, which can be made by stamping and bending a whole sheet of thin plate. Its raised isolation cover part is circular, and four fastening bolts 302 are installed in the middle circular plate area to connect it to the liquid cargo tank shell 1; its non-raised part is a square support plate 3033. One side of the elastic support sheet 303 contacts the first insulation plate 304, and the other side contacts the second insulation plate 305 and the third insulation plate 306. Its notable feature is that a certain gap is left in each part. Its main function: the elastic support sheet 303 is not in "hard" contact with other structures, and it itself is a non-planar structure. Under ultra-low temperature changes, it can produce elastic deformation, effectively transfer heat loads, maintain a connection relationship with each insulation plate, and improve stability. All insulation plates are elastically connected, which can effectively withstand the thermal deformation and thermal stress of the liquid cargo tank shell 1 caused by large temperature differences during ultra-low temperature cargo loading and unloading;

[0050] Furthermore, the elastic support sheet 303 is connected to the cargo tank shell 1 through the fastening bolts 302 penetrating the circular plate 3031. A pad 301 is welded on the surface of the cargo tank shell 1 as a positioning mark for the fastening bolts 302. One end of the fastening bolt 302 is connected to the pad 301 by butt welding, and the other end is connected to the elastic support sheet 303 by a nut. Before the thermal insulation system is installed, after the cargo tank shell 1 is fully formed, the specific position of the pad 301 is confirmed by marking, and then connected to the surface of the cargo tank shell 1 by fillet welding. The main function of the pad 301 is: conventionally, the fastening bolts 302 are directly butt-welded to the liquid cargo tank shell 1. When there is a quality problem with the butt welding, it is generally repaired by welding, which is likely to affect the surface quality of the liquid cargo tank shell 1, or replace the installation position of the fastening bolts 302, which affects the opening position of the second insulation board 305, causing waste and increasing costs. The patent of the present invention avoids this problem. When there is a quality problem with the butt welding, the fastening bolts 302 can be cut off first, and then the surface of the pad 301 can be polished, and the fastening bolts 302 can be re-welded and installed at the original position without causing damage to the liquid cargo tank shell 1.

[0051] Furthermore, a side of the first insulation plate 304 in contact with the cargo tank shell 1 is provided with a plurality of grooves serving as leakage channels 2 .

[0052] Furthermore, the surface of the third insulation board 306 away from the cargo tank shell 1 is a plane or a non-plane (such as a wavy surface). The non-plane surface is to save the amount of raw materials and is more economical. It is suitable for the side and bottom surfaces of the cargo tank shell 1; Figure 4 As shown, the third insulation board 306 with a flat surface is for the convenience of personnel standing for inspection and construction, and is suitable for the top surface of the liquid cargo tank shell 1.

[0053] Furthermore, the third insulation board 306 fills the gap between the adjacent second insulation board 305, leaving a gap between the second insulation board 305 and the second insulation board 305, and is filled with polyurethane filler 307. Its main function is to provide good sealing effect, preventing the leaked liquid from flowing out through the connection gap between the insulation boards, affecting the sealing of the insulation boards.

[0054] In summary, the present invention provides a thermal insulation system for a liquid cargo tank, which includes an elastic support sheet arranged on the outside of the liquid cargo tank shell, the elastic support sheet is a stainless steel metal sheet, the raised isolation cover portion thereof is circular, and the middle circular plate area is installed with 4 fastening bolts to connect with the liquid cargo tank shell; the non-raised portion thereof is square. One side of the elastic support sheet contacts the first thermal insulation plate, and the other side contacts the second thermal insulation plate and the third thermal insulation plate. Since the elastic support sheet is in non-rigid contact with other structures and is a non-planar structure itself, it can produce elastic deformation under ultra-low temperature changes, and effectively transfer heat loads at the same time, maintain a connection relationship with each thermal insulation plate, and improve stability. Furthermore, the elastic support sheet is connected to the liquid cargo tank shell by fastening bolts penetrating the circular plate, and a pad is welded on the surface of the liquid cargo tank shell as a positioning mark for the fastening bolts. One end of the fastening bolt is connected to the pad by butt welding, and the other end is connected to the elastic support sheet by a nut. When there is a quality problem in the butt welding, the fastening bolts can be cut off first, and then the surface of the pad can be polished, and the fastening bolts can be re-welded in the original position without causing damage to the liquid cargo tank shell. The insulation system has a good thermal insulation effect. At the same time, due to the certain gaps between the layers of insulation boards, the stress deformation caused by thermal expansion and contraction is avoided. At the same time, a certain construction accuracy deviation can be allowed, reducing the difficulty of construction.

[0055] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A liquid cargo tank insulation system, comprising a liquid cargo tank shell and an elastic support sheet, characterized in that: The elastic support sheet includes a truncated cone-shaped isolation cover, a support plate connected to the outer edge of the isolation cover, the outer edge of the support plate is square, the isolation cover includes a circular plate and a conical surface connected to the outer edge of the circular plate, the circular plate and the conical surface form an inner cavity, and the circular plate is parallel to the support plate; The circular plate is arranged parallel to the liquid cargo tank shell with the inner cavity facing outward, a gap is left between the circular plate and the liquid cargo tank shell as a leakage channel, and the first insulation plate is attached to the surface of the liquid cargo tank shell and fills the gap between the conical surfaces of adjacent elastic support sheets.

2. The thermal insulation system according to claim 1, characterized in that: The second insulation board fills the inner cavity and protrudes outward from the inner cavity. The portion of the second insulation board protruding from the inner cavity is circular and covers a portion of the support plate. A gap is left between the second insulation board and the conical surface of the elastic support sheet.

3. The thermal insulation system according to claim 2, characterized in that: The third thermal insulation board covers a portion of the second thermal insulation board away from the outer surface of the liquid cargo tank shell, and fills the gaps between adjacent second thermal insulation boards.

4. The thermal insulation system according to claim 3, characterized in that: The portion of the third insulation board that fills the gap between the adjacent second insulation boards is in contact with the support plate and is separated from the first insulation board by the support plate.

5. The thermal insulation system according to claim 3, characterized in that: The gap between adjacent third insulation boards is located in the central area of ​​the second insulation board and is filled with glass wool, and the gap between adjacent third insulation boards is pasted with a tape covering the glass wool.

6. The thermal insulation system according to claim 3, characterized in that: The third insulation board fills the gap between the adjacent second insulation boards, leaving a gap between the second insulation boards and the third insulation board, and is filled with polyurethane filler.

7. The thermal insulation system according to claim 1, characterized in that: The elastic support sheet is connected to the liquid cargo tank shell by fastening bolts penetrating the circular plate.

8. The thermal insulation system according to claim 7, characterized in that: A pad is welded on the surface of the liquid cargo tank shell as a positioning mark for the fastening bolt. One end of the fastening bolt is connected to the pad by butt welding, and the other end is connected to the elastic support sheet by a nut.

9. The thermal insulation system according to claim 1, characterized in that: The side of the first insulation plate in contact with the liquid cargo tank shell is provided with a plurality of grooves as leakage channels.

10. The thermal insulation system according to claim 3, characterized in that: The surface of the third insulation board away from the liquid cargo tank shell is flat or non-flat. The third insulation board with a flat surface is used for the top surface of the liquid cargo tank shell, and the third insulation board with a non-flat surface is used for the side and bottom surfaces of the liquid cargo tank shell.

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