Liquid cargo tanks and liquefied gas tankers

Abstract

The present invention provides a liquid cargo tank and a liquefied gas carrier, which relate to the field of ship technology. The liquid cargo tank includes an outer shell and a supporting structure; the outer shell includes a bottom wall, a side wall and a top wall; the supporting structure includes a bottom strong frame, a side strong frame, a top strong frame and an open web; the bottom strong frame is connected to the inner side of the bottom wall, the side strong frame is connected to the inner side of the side wall, and the top strong frame is connected to the inner side of the top wall, and the bottom strong frame and the side strong frame, as well as the top strong frame and the side strong frame, are all connected by an open web. The liquefied gas carrier includes the aforementioned liquid cargo tank. The present invention alleviates the technical problem in the prior art that, in order to enable the liquefied gas hull of the existing Type A liquid cargo tank to enter the Yangtze River, the ship width is increased by increasing the size of its components, resulting in a large weight of the liquid cargo tank, thereby increasing the operating cost of the shipyard.

Description

Technical Field

[0001] The present invention relates to the technical field of ships, and in particular to a liquid cargo tank and a liquefied gas ship. Background Art

[0002] According to the International Maritime Organization, the main types of cargo tanks for vessels carrying liquefied gases in bulk are membrane tanks and independent tanks. Independent tanks can be further categorized as Type A, Type B, and Type C. Type A requires a complete secondary barrier, Type B requires a partial secondary barrier, and Type C is a pressure vessel and does not require a secondary barrier.

[0003] In order to enable a liquefied gas carrier with a type A liquid cargo tank whose bottom and top plate widths are smaller than their height to enter the Yangtze River for navigation, it is necessary to improve the structure of the liquefied gas carrier in view of the limitations of water depth and the height of bridges over the Yangtze River, so that it can become a Yangtze River-entering liquefied gas carrier with a large ship width, a small draft and a shallow draft. In the existing technology, the ship width is increased by increasing the size of the liquefied gas carrier hull components of the existing type A liquid cargo tank, which at least has the disadvantage of a large weight of the liquid cargo tank, thereby increasing the operating costs of the shipyard. Summary of the Invention

[0004] The object of the present invention is to provide a liquid cargo tank and a liquefied gas ship to alleviate the technical problem in the prior art that in order to enable the liquefied gas hull of the existing Type A liquid cargo tank to enter the Yangtze River, the ship width is increased by increasing the size of its components, resulting in a large weight of the liquid cargo tank and high shipyard operating costs.

[0005] To achieve the above objectives, the embodiments of the present invention adopt the following technical solutions:

[0006] In a first aspect, an embodiment of the present invention provides a liquid cargo tank, which is applied to a liquefied gas carrier and includes an outer shell and a supporting structure; the outer shell includes a bottom wall, a side wall and a top wall; the supporting structure includes a bottom strong frame, a lateral strong frame, a top strong frame and an open web; the bottom strong frame is connected to the inner side of the bottom wall, the lateral strong frame is connected to the inner side of the side wall, and the top strong frame is connected to the inner side of the top wall, and the bottom strong frame and the lateral strong frame, as well as the top strong frame and the lateral strong frame, are all connected through the open web.

[0007] In an optional embodiment, the height of the perforated web is 400 mm-900 mm; the radius of the arc of the contour line of the opening on the perforated web is 300 mm-1000 mm.

[0008] In an optional embodiment, the opening edge of the opening web is covered with a panel.

[0009] In an optional embodiment, strong frame panels are provided on the side surfaces of the bottom strong frame, the side surfaces of the lateral strong frames, and the side surfaces of the top strong frame.

[0010] In an optional embodiment, both ends of the bottom wall are connected to the side walls via inclined plates.

[0011] In an optional embodiment, a liquid cargo tank center longitudinal bulkhead is provided inside the outer shell, and the supporting structure further includes a center longitudinal vertical girder provided on the center longitudinal bulkhead, one end of the center longitudinal vertical girder is connected to the top strong frame, and the other end of the center longitudinal vertical girder is connected to the bottom strong frame.

[0012] In an optional embodiment, the support structure further comprises longitudinal frames provided on the outer shell.

[0013] In an optional embodiment, the support structure further includes reinforcing ribs and / or large brackets provided on the bottom stiffener, the lateral stiffener, the top stiffener, and the perforated web, wherein "and / or" indicates that the reinforcing ribs and large brackets are provided simultaneously or selectively.

[0014] In an optional embodiment, there are multiple bottom strong frames, and the multiple bottom strong frames are arranged at equal intervals in the longitudinal direction of the liquid cargo tank.

[0015] In a second aspect, an embodiment of the present invention provides a liquefied gas carrier comprising the liquid cargo tank described in any one of the aforementioned embodiments.

[0016] The embodiments of the present invention can achieve the following beneficial effects:

[0017] In a first aspect, an embodiment of the present invention provides a liquid cargo tank, which is applied to a liquefied gas carrier and includes an outer shell and a supporting structure; the outer shell includes a bottom wall, a side wall and a top wall; the supporting structure includes a bottom strong frame, a lateral strong frame, a top strong frame and an open web; the bottom strong frame is connected to the inner side of the bottom wall, the lateral strong frame is connected to the inner side of the side wall, and the top strong frame is connected to the inner side of the top wall, and the bottom strong frame and the lateral strong frame, as well as the top strong frame and the lateral strong frame, are all connected through the open web.

[0018] The embodiment of the present invention adopts a perforated web as the reinforced web structure of the liquid cargo tank, thereby reducing the overall weight of the liquid cargo tank while increasing the liquefied gas hull width of the existing A-type liquid cargo tank to meet the requirements for entering the Yangtze River, thereby reducing the shipyard operating costs.

[0019] In summary, the embodiments of the present invention at least alleviate the technical problem in the prior art that, in order to enable the liquefied gas hull of the existing Type A liquid cargo tank to enter the Yangtze River, the ship width is increased by increasing the size of its components, resulting in a large weight of the liquid cargo tank and thus high shipyard operating costs.

[0020] In a second aspect, an embodiment of the present invention provides a liquefied gas ship, comprising the liquid cargo tank provided by the first aspect. Since the liquefied gas ship provided by the embodiment of the present invention comprises the liquid cargo tank provided by the first aspect, the liquefied gas ship provided by the embodiment of the present invention can achieve all the beneficial effects that can be achieved by the liquid cargo tank provided by the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A cross-sectional view of a liquid cargo tank provided in an embodiment of the present invention;

[0023] Figure 2 A top view of the bottom structure of a liquid cargo tank provided in an embodiment of the present invention.

[0024] Icon: 1- bottom wall; 2- inclined plate; 3- side wall; 4- top wall; 5- longitudinal bulkhead of liquid cargo tank; 6- bottom strong frame; 7- strong frame panel; 8- bottom open web; 9- lateral strong frame; 10- top strong frame; 11- top open web; 12- middle longitudinal vertical girder; 13- longitudinal frame; 14- stiffener; 15- large bracket; 16- end wall of liquid cargo tank. DETAILED DESCRIPTION

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0028] In the description of the present invention, it should be noted that the terms "upper," "lower," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and simplify the description, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," etc., etc., are used solely for distinction and should not be construed as indicating or implying relative importance.

[0029] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0030] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0031] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0032] Example 1

[0033] This embodiment provides a liquid cargo tank, referring to Figure 1 The liquid cargo tank is applied to a liquefied gas carrier and includes an outer shell and a supporting structure; specifically, the outer shell includes a bottom wall 1, a side wall 3 and a top wall 4; the supporting structure includes a bottom strong frame 6, a lateral strong frame 9, a top strong frame 10 and an open web; the bottom strong frame 6 is connected to the inner side of the bottom wall 1, the lateral strong frame 9 is connected to the inner side of the side wall 3, and the top strong frame 10 is connected to the inner side of the top wall 4, and the bottom strong frame 6 and the lateral strong frame 9, as well as the top strong frame 10 and the lateral strong frame 9, are all connected through the open web.

[0034] This embodiment adopts perforated webs as the reinforced web structure of the liquid cargo tank, thereby reducing the overall weight of the liquid cargo tank while increasing the liquefied gas hull width of the existing A-type liquid cargo tank to meet the requirements for entering the Yangtze River, thereby reducing the shipyard operating costs.

[0035] In summary, this embodiment at least alleviates the technical problem in the prior art that, in order to enable the liquefied gas hull of the existing Type A liquid cargo tank to enter the Yangtze River, the ship width is increased by increasing the size of its components, resulting in a large weight of the liquid cargo tank and thus high shipyard operating costs.

[0036] More specifically, in this embodiment, Figure 1 As shown, the perforated web includes a top perforated web 11 and a bottom perforated web 8, and the heights of the top perforated web 11 and the bottom perforated web 8 can be, but are not limited to, 400 mm, 600 mm, 900 mm, or any height between 400 mm and 900 mm; the contour arc radius of the openings on the top perforated web 11 and the bottom perforated web 8 can be, but are not limited to, 300 mm, 700 mm, 1000 mm, or any radius between 300 mm and 1000 mm.

[0037] In addition, in order to further enhance the structural strength, in an optional implementation manner of this embodiment, the opening edge portions of each of the above-mentioned opening webs are covered with panels to enhance the supporting force of the opening webs.

[0038] Continue to refer to Figure 1 Preferably, strong frame panels 7 are provided on the side surfaces of the bottom strong frame 6 , the side surfaces of the lateral strong frames 9 , and the side surfaces of the top strong frame 10 .

[0039] Continue to refer to Figure 1 Preferably, both ends of the bottom wall 1 are connected to the side wall 3 through the inclined plate 2. In addition, referring to Figure 2 Preferably, the front and rear ends of the liquid cargo tank are respectively provided with liquid cargo tank end walls 16.

[0040] In addition, refer to Figure 1 , combined with Figure 2 In an optional implementation manner of the present embodiment, it is more preferred that a liquid cargo tank middle longitudinal bulkhead 5 is provided inside the liquid cargo tank shell, and the aforementioned supporting structure further includes a middle longitudinal vertical girder 12 provided on the liquid cargo tank middle longitudinal bulkhead 5, one end of the middle longitudinal vertical girder 12 is connected to the top strong frame 10, and the other end of the middle longitudinal vertical girder 12 is connected to the bottom strong frame 6, which can play a role in supporting the bottom strong frame 6 and the top strong frame 10, further enhancing the supporting performance to stabilize the liquefied tank structure.

[0041] In addition, continue to refer to Figure 1 Preferably, the support structure further comprises a longitudinal frame 13 provided on the shell; Figure 1 Preferably, the support structure further includes reinforcing ribs 14 and / or large brackets 15 provided on the bottom frame 6, lateral frames 9, top frame 10, and perforated web. "And / or" indicates that the reinforcing ribs 14 and large brackets 15 are provided simultaneously or selectively. These structures can provide enhanced support and prevent the shell from bending.

[0042] In addition, in an optional implementation of this embodiment, it is more preferred that a plurality of the above-mentioned bottom strong frames 6 are provided, and the plurality of bottom strong frames 6 are arranged at equal intervals in the length direction of the liquid cargo tank, so that the supporting force provided by the bottom strong frames 6 is more uniform.

[0043] Example 2

[0044] This embodiment provides a liquefied gas carrier, which includes a liquid cargo tank provided by any optional implementation manner in Example 1.

[0045] Since the liquefied gas ship provided in this embodiment includes the liquid cargo tank described in Example 1, the liquefied gas ship provided in this embodiment can achieve all the beneficial effects that the liquid cargo tank in Example 1 can achieve, and its specific structure and achievable effects can be obtained by referring to the various optional or preferred implementation methods in Example 1.

[0046] Finally, it should be noted that: the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other; the above embodiments in this specification are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that: it is still possible to modify the technical solutions recorded in the aforementioned embodiments, or to replace some or all of the technical features therein with equivalents; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A liquid cargo tank, used in a liquefied gas carrier, characterized in that: including the housing and supporting structure; The housing comprises a bottom wall (1), a side wall (3) and a top wall (4); The supporting structure comprises a bottom strong frame (6), a lateral strong frame (9), a top strong frame (10) and an open-hole web; The bottom strong frame (6) is connected to the inner side of the bottom wall (1), the lateral strong frame (9) is connected to the inner side of the side wall (3), and the top strong frame (10) is connected to the inner side of the top wall (4). The bottom strong frame (6) and the lateral strong frame (9), as well as the top strong frame (10) and the lateral strong frame (9), are all connected via the perforated web. The height of the perforated web is 400mm-900mm; the radius of the arc of the contour of the opening on the perforated web is 300mm-1000mm; and the edge of the opening of the perforated web is covered with a panel; A liquid cargo tank middle longitudinal bulkhead (5) is arranged inside the shell, and the supporting structure also includes a middle longitudinal vertical girder (12) arranged on the liquid cargo tank middle longitudinal bulkhead (5), one end of the middle longitudinal vertical girder (12) is connected to the top strong frame (10), and the other end of the middle longitudinal vertical girder (12) is connected to the bottom strong frame (6).

2. The liquid cargo tank according to claim 1, characterized in that: Strong frame panels (7) are provided on the side surfaces of the bottom strong frame (6), the side surfaces of the lateral strong frame (9), and the side surfaces of the top strong frame (10).

3. The liquid cargo tank according to claim 1, characterized in that: Both ends of the bottom wall (1) are connected to the side walls (3) via inclined plates (2).

4. The liquid cargo tank according to claim 1, characterized in that: The support structure further comprises longitudinal frames (13) arranged on the outer shell.

5. The liquid cargo tank according to claim 1, characterized in that: The supporting structure further comprises reinforcing ribs (14) and / or large brackets (15) arranged on the bottom strong frame (6), the lateral strong frame (9), the top strong frame (10) and the perforated web.

6. The liquid cargo tank according to claim 1, characterized in that: There are a plurality of bottom strong frames (6), and the plurality of bottom strong frames (6) are arranged at equal intervals in the length direction of the liquid cargo tank.

7. A liquefied gas carrier, characterized in that: A liquid cargo tank comprising the liquid cargo tank according to any one of claims 1 to 6.

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