Corrugated unit and corrugated plate of liquefied natural gas (LNG) ship liquid cargo containment system

Abstract

The invention relates to a corrugated unit and corrugated plate for a liquid cargo containment system of an LNG (Liquefied Natural Gas) ship, and the corrugated unit for the liquid cargo containment system of the LNG ship comprises a first straight part, a second straight part and a corrugated convex part which is tangentially connected with the first straight part and the second straight part respectively, the corrugated protruding part has a certain height relative to the first straight part and the second straight part, and the height is smaller than the length of the first straight part and the length of the second straight part. The corrugated protruding part comprises a plurality of sections of arc parts which are connected in a tangent mode. According to the corrugated plate, transverse and longitudinal low-temperature cold contraction deformation is absorbed through the corrugated structure at the same time, and meanwhile internal stress generated by low-temperature cold contraction between welding anchoring points on the edge of the corrugated plate is reduced. The corrugation structure is simple, the corrugation protruding height is small, the material thinning rate in the machining and stamping process is low, machining is easy, and the yield is high.

Description

Technical Field

[0001] The present application relates to the technical field of shipbuilding, and in particular to a corrugated unit and a corrugated plate of a liquid cargo containment system of an LNG ship. Background Art

[0002] The cross-shaped continuous closed-loop corrugation of the corrugated plate of the LNG ship containment system is currently commonly used. In the working scene with large temperature differences, stress concentration is prone to occur in the non-corrugated area of ​​the welding anchor section. The corrugation arrangement is relatively concentrated, and the parent material forming and local thinning rate are difficult to control during the corrugation stamping process. Summary of the invention

[0003] (1) Technical issues to be solved

[0004] The present application provides a corrugated unit and a corrugated plate of a liquid cargo containment system of an LNG ship, which solve the problems in the above-mentioned background technology.

[0005] (2) Technical solution

[0006] In the first aspect, the present application provides a corrugated unit of a liquid cargo containment system of an LNG ship, comprising a first straight portion, a second straight portion, and a corrugated raised portion tangentially connected to the first straight portion and the second straight portion, respectively, the corrugated raised portion having a certain height relative to the first straight portion and the second straight portion, the height being less than the length of the first straight portion and the second straight portion; the corrugated raised portion comprises a plurality of tangentially connected circular arc portions.

[0007] Furthermore, the first straight portion and the second straight portion are located on the same horizontal plane.

[0008] Furthermore, the corrugated raised portion is symmetrical about its own midline.

[0009] Furthermore, the corrugated protrusion portion includes a first arc portion, a second arc portion and a third arc portion which are tangentially connected to each other.

[0010] Further, the first arc portion is tangentially connected to the first straight portion and the second arc portion respectively.

[0011] Furthermore, the second arc portion is tangentially connected to the first arc portion and the third arc portion respectively.

[0012] Furthermore, the third arc portion is tangentially connected to the second arc portion and the second straight portion respectively.

[0013] Furthermore, the radius and arc length of the first arc portion and the third arc portion are equal; the radius of the second arc portion is five times the radius of the first arc portion, and is one tenth the length of the longer one of the first straight portion and the second straight portion.

[0014] In a second aspect, the present application provides a corrugated plate of a liquid cargo containment system for an LNG ship, wherein the corrugated plate is obtained by splicing a plurality of corrugated units of the liquid cargo containment system for an LNG ship in a symmetrical manner in a cross-sectional and longitudinal direction.

[0015] (3) Beneficial effects

[0016] The above technical solution of the present application has the following advantages:

[0017] The corrugated unit of the LNG ship liquid cargo containment system provided in the first aspect of the present application can pre-store stretching margins through corrugated protrusions, and the cold shrinkage internal stress of a single particle at low temperature is reduced compared to that of a straight material. The corrugated form has a simple structure, a small height of corrugated protrusions, a low material thinning rate during processing and stamping, and is easy to process with a high yield rate.

[0018] It can be understood that the beneficial effects of the second aspect mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 Schematic diagram of the corrugated unit of the LNG carrier liquid cargo containment system provided for this application;

[0021] Figure 2 Schematic diagram of the corrugated plate of the LNG carrier liquid cargo containment system provided for this application;

[0022] Figure 3 A partial front view of the corrugated plate of the LNG carrier liquid cargo containment system provided for this application;

[0023] Figure 4 A partial top view of the corrugated plate of the LNG carrier liquid cargo containment system provided for this application.

[0024] Figure numerals: 1, first straight portion; 2, second straight portion; 3, corrugated raised portion; 31, first arc portion; 32, second arc portion; 33, third arc portion. DETAILED DESCRIPTION

[0025] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0026] In the description of the present invention, it is necessary to understand that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. appearing in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways.

[0029] The present application provides a corrugated unit and a corrugated plate of an LNG ship liquid cargo containment system, the purpose of which is to reduce the internal stress caused by low-temperature shrinkage of the corrugated plate in a working scenario with large temperature differences. The corrugated plate is suitable for liquid cargo tanks of LNG transport ships, LNG fuel tanks of other ships, and land LNG storage tanks, etc.

[0030] The specific implementation methods of the present application are further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but are not intended to limit the scope of the present application.

[0031] The present application embodiment provides a corrugated unit of a liquid cargo containment system of an LNG ship, such as Figure 1As shown, it includes a first straight portion 1, a second straight portion 2, and a corrugated raised portion 3 tangentially connected to the first straight portion 1 and the second straight portion 2, respectively. The corrugated raised portion 3 has a certain height relative to the first straight portion 1 and the second straight portion 2, and the height is less than the length of the first straight portion 1 and the second straight portion 2; the corrugated raised portion 3 includes a plurality of tangentially connected arc portions.

[0032] In some embodiments, the first straight portion 1 and the second straight portion 2 are located on the same horizontal plane.

[0033] In some embodiments, the corrugated protrusion 3 is symmetrical about its own midline.

[0034] In some embodiments, the corrugated protrusion 3 includes a first arc portion 31 , a second arc portion 32 and a third arc portion 33 which are tangentially connected.

[0035] In some embodiments, the first arc portion 31 is tangentially connected to the first straight portion 1 and the second arc portion 32 respectively.

[0036] In some embodiments, the second arc portion 32 is tangentially connected to the first arc portion 31 and the third arc portion 33 respectively.

[0037] In some embodiments, the third arc portion 33 is tangentially connected to the second arc portion 32 and the second straight portion 2 respectively.

[0038] In some embodiments, the radius and arc length of the first arc portion 31 and the third arc portion 33 are equal; the radius of the second arc portion 32 is five times the radius of the first arc portion 31 and is one tenth the length of the longer one of the first straight portion 1 and the second straight portion 2.

[0039] In application, the corrugated protrusion 3 is designed as a cross section composed of three tangent arc lines, that is, the linear protrusion part of the corrugated unit cross section is connected by three tangent arc lines, and the arc lines at both ends are also tangently connected to the straight part.

[0040] The corrugated strip bulge formed by three tangentially connected arcs can pre-store the stretching margin, and the shrinkage internal stress of a single particle at low temperature is reduced compared to straight materials. The corrugated strip structure formed by three tangentially connected arcs is symmetrical and stable, the bulge size is small, and the bearing capacity is strong, which can avoid the work of installing a pressure pad on the reverse side.

[0041] like Figure 1 As shown, the corrugated protrusion 3 includes a first arc portion 31, a second arc portion 32 and a third arc portion 33 which are tangentially connected. The corrugated strip formed by the above can cope with the cold shrinkage deformation in the length direction of the corrugated strip perpendicular to the low temperature condition.

[0042] The present application also provides a corrugated plate for a liquid cargo containment system of an LNG ship, such as Figures 2 to 4 As shown, the corrugated plate is obtained by splicing a plurality of corrugated units of the LNG ship liquid cargo containment system in a symmetrical manner in a vertical and horizontal manner.

[0043] In application, the corrugated plates are arranged in a dense, evenly spaced, and cross-sectional manner, which can evenly disperse the low-temperature shrinkage stress and enable the corrugated plates to shrink or stretch in both longitudinal and transverse directions without causing plastic deformation of the material.

[0044] By arranging the corrugated strips in a dense and equidistant manner vertically and horizontally, the corrugated board has the ability to shrink or stretch in both the vertical and horizontal directions to cope with the stress caused by low-temperature shrinkage deformation. The dense arrangement makes the low-temperature shrinkage stress evenly dispersed.

[0045] The corrugated plate has a simple structure, a small bulge height vertical to the plate surface, and a strong bearing capacity, and there is no need to set a pressure-bearing aluminum block on the back of the corrugation. The corrugations are densely arranged and have a small distribution spacing, which can effectively disperse the low-temperature shrinkage deformation, so that the deformation borne by each corrugation is small and controlled within the elastic deformation, which increases the fatigue life and improves safety.

[0046] like Figure 2 As shown in the figure, the corrugated strips are densely arranged in a crisscross pattern at equal intervals, so that the corrugated plate has the ability to shrink or stretch in both the longitudinal and transverse directions at the same time to cope with the stress caused by low-temperature shrinkage deformation. It protects the material itself from plastic deformation or improves the fatigue strength to cope with shrinkage deformation.

[0047] In this embodiment, the specifications of a single corrugated unit are 200mm×200mm, the corrugation protrusion is 10mm, the radius of the second arc portion is 10mm, the radius of the first arc portion and the third arc portion is 2mm, and the plate thickness is 1.2mm; the specifications of the entire corrugated plate are 3000mm×1000mm, the corrugation strip protrusion is 10mm, and the plate thickness is 1.2mm. The specific dimensions can be adjusted according to demand.

[0048] In this embodiment, the single corrugated unit does not exist independently, but is stamped together with the entire corrugated plate on a whole mother plate, and exists in a continuous form.

[0049] In this embodiment, a straight edge is reserved around the edge of the entire corrugated plate to be used as an anchor for welding the corrugated plate.

[0050] The corrugated unit and corrugated plate of the LNG ship liquid cargo containment system provided in the embodiment of the present application can absorb the low-temperature shrinkage deformation in both horizontal and vertical directions through the corrugated structure, and also reduce the internal stress caused by low-temperature shrinkage between the edge welding anchor points of the corrugated plate. The corrugated unit has a simple structure and is easy to process. The forming process during stamping is easy to control, the thinning rate is uniform and dispersed, and the yield rate is high. It can be used in working scenarios that need to withstand large temperature differences, including but not limited to LNG transport ships, LNG fuel tanks, LNG land storage tanks, etc.

[0051] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In actual applications, the above-mentioned functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application.

[0052] It should be clear that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. For the embodiments of the method, the relevant parts can refer to the partial description of the device embodiment (adopted according to the writing situation). The present application is not limited to the specific steps and structures described above and shown in the figures. In addition, for the sake of simplicity, a detailed description of known method technologies is omitted here.

[0053] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A corrugated unit for a liquid cargo containment system of an LNG ship, characterized in that: It includes a first straight portion, a second straight portion, and a corrugated raised portion tangentially connected to the first straight portion and the second straight portion respectively. The corrugated raised portion has a certain height relative to the first straight portion and the second straight portion, and the height is less than the length of the first straight portion and the second straight portion; the corrugated raised portion includes multiple sections of tangentially connected circular arc portions.

2. The corrugated unit of the LNG carrier liquid cargo containment system according to claim 1, characterized in that: The first straight portion and the second straight portion are located on the same horizontal plane.

3. The corrugated unit of the LNG carrier liquid cargo containment system according to claim 1, characterized in that: The corrugated raised portion is symmetrical about its own midline.

4. The corrugated unit of the LNG carrier liquid cargo containment system according to claim 1, characterized in that: The corrugated protrusion portion includes a first arc portion, a second arc portion and a third arc portion which are tangentially connected.

5. The corrugated unit of the LNG carrier liquid cargo containment system according to claim 4, characterized in that: The first arc portion is tangentially connected to the first straight portion and the second arc portion respectively.

6. The corrugated unit of the LNG carrier liquid cargo containment system according to claim 4, characterized in that: The second arc portion is tangentially connected to the first arc portion and the third arc portion respectively.

7. The corrugated unit of the LNG carrier liquid cargo containment system according to claim 4, characterized in that: The third arc portion is tangentially connected to the second arc portion and the second straight portion respectively.

8. The corrugated unit of the LNG carrier liquid cargo containment system according to claim 4, characterized in that: The radius and arc length of the first arc portion and the third arc portion are equal; the radius of the second arc portion is five times the radius of the first arc portion and one tenth the length of the longer one of the first straight portion and the second straight portion.

9. A corrugated plate for a liquid cargo containment system of an LNG ship, characterized in that: The corrugated plate is obtained by splicing a plurality of corrugated units of the LNG ship liquid cargo containment system according to any one of claims 1 to 8 in a crisscross manner with equal spacing.

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