High sealing transmission pipeline for LNG fuel system of a tanker

Abstract

The utility model relates to a kind of high sealing transmission pipeline for LNG fuel system of box ship applied to pipeline field, including multiple pipeline bodies, and the encapsulation pipe with flange is connected between adjacent one pair of pipeline bodies, sealing element is connected between a pair of encapsulation pipe, the end of one pair of encapsulation pipe mutually close is all set up outer annular groove, mounting piece is connected on the inner wall of outer annular groove far from notch, mounting piece is set up thread groove in the end close to outer annular groove notch, sealing element includes hard body, the inner end surface and outer end surface of hard body are all fixedly connected with sealing layer one, the left and right ends of hard body are all fixedly connected with threaded tube, by the above structure, the interface of pipeline body is realized double sealing effect, the flow path when LNG leaks is lengthened, reduce the risk that LNG leaks to outside, when there is LNG leakage condition, by the change of reaction piece, deep sealing effect is realized, reaches the automatic emergency handling effect of leakage condition.

Description

Technical Field

[0001] This utility model relates to a transmission pipeline, and more particularly to a high-sealing transmission pipeline for LNG fuel systems in container ships, which is applied in the field of pipelines. Background Technology

[0002] LNG, or liquefied natural gas, is natural gas that has been compressed and cooled to its freezing point (-161.5°C) and turned into a liquid. LNG is usually stored in cryogenic storage tanks at -161.5°C and a pressure of about 0.1 MPa. Its main component is methane, and LNG is transported over long distances via pipelines.

[0003] For example, Chinese patent CN217130735U discloses an LNG high-sealing and heat-insulated transportation pipeline, including a metal protective layer and a cryogenic pipeline body. The cryogenic pipeline body is fitted inside the metal protective layer. The inner wall of the metal protective layer is fitted with a moisture-proof layer. The inner wall of the moisture-proof layer is fitted with an outer layer of cold-insulating pipe. An inner layer of cold-insulating pipe is fitted between the inner wall of the outer layer of cold-insulating pipe and the outer wall of the cryogenic pipeline body. An overlap joint is opened on one side of the metal protective layer. Both the outer layer of cold-insulating pipe and the inner layer of cold-insulating pipe have longitudinal joints and radial joints on one side. This utility model can ensure the airtightness and heat insulation of pipeline transportation and achieve stable natural gas transportation.

[0004] For example, Chinese patent CN217328883U discloses a conveying pipeline for an LNG gasification station with good sealing performance. The connection between the first and second conveying pipes is sealed by an installed sealing mechanism. The sealing gasbag and sealing liquid work together to ensure the sealing performance of the connection between the first and second conveying pipes and ensure the gas transmission safety of the gasification station. However, the gasbag used in this method is prone to elastic fatigue, which can cause it to rupture and fail to seal.

[0005] In the existing technology, adjacent LNG transmission pipelines are generally connected by flanges. However, during long-term use, leaks are prone to occur at the interface. The existing sealing structure has significant defects, making it difficult to deal with leaks in a timely manner, which affects the transmission of natural gas. Utility Model Content

[0006] The technical problem that this utility model aims to solve in view of the above-mentioned prior art is that existing LNG transmission pipelines lack effective sealing measures and are difficult to handle in a timely manner after leakage, which affects the transmission of natural gas.

[0007] To address the aforementioned problems, this utility model provides a high-sealing transmission pipeline for LNG fuel systems in container ships, comprising multiple pipeline bodies. Adjacent pairs of pipeline bodies are connected by flanged encapsulation pipes, and a sealing element is connected between the pairs of encapsulation pipes. Each pair of encapsulation pipes has an outer annular groove at its closest end. An installation component is connected to the inner wall of the outer annular groove away from the groove opening. A threaded groove is formed at the end of the installation component near the groove opening. The sealing element includes a rigid body. The outer diameter of the rigid body changes from increasing to decreasing along its axial direction, and the inner diameter of the rigid body changes from decreasing to increasing along its axial direction. A sealing layer is fixedly connected to both the inner and outer end faces of the rigid body. Threaded pipes are fixedly connected to both the left and right ends of the rigid body, and the threaded pipes are threadedly connected to the threaded grooves.

[0008] As a further supplement to this application, an inner diameter-changing groove is provided on the inner wall of the outer annular groove away from the groove opening, and the mounting component is rotatably connected to the inside of the inner diameter-changing groove. An extension groove is provided on the inner wall of the inner diameter-changing groove away from the groove opening of the outer annular groove, and a reaction element is provided inside the extension groove.

[0009] As a further supplement to this application, the mounting component includes an intermediate body, on which a second sealing layer is fixedly connected to both the inner and outer end faces. A threaded groove is provided on the intermediate body, and the surface of the second sealing layer is in close contact with the inner wall of the inner diameter-changing groove.

[0010] As a further supplement to this application, the reaction element includes a deformation ring and a pair of thin rings respectively disposed on the left and right sides of the deformation ring. Both the deformation ring and the thin rings are slidably connected inside the extension groove. A plurality of uniformly distributed compression springs are fixedly connected between the thin ring on the side away from the mounting element and the inner wall of the extension groove.

[0011] As a further supplement to this application, the inner wall of the outer ring of the inner variable diameter groove is provided with multiple evenly distributed sliding grooves, and multiple sliders are fixedly connected to the outer end face of the intermediate body, and the multiple sliders are slidably connected to the interior of the multiple sliding grooves respectively.

[0012] As a further supplement to this application, the mounting component includes a variable diameter section and a cylindrical section. The cylindrical section is located on the side closer to the reactant, and the slider is located at the outer end of the cylindrical section. The variable diameter section is located on the side closer to the seal. The outer diameter of the variable diameter section gradually increases in the direction away from the seal, and its inner diameter gradually decreases in the direction away from the seal.

[0013] As a further supplement to this application, the deformation ring includes a flexible bag and a filler filled inside the flexible bag, the filler being made of a low-temperature expanding material.

[0014] In summary, this application achieves installation at the interface of a pair of pipe bodies through a sealing tube, and simultaneously covers the outside of the interface gap of the pair of pipe bodies with a sealing element, effectively sealing the interface of the pipe bodies, effectively extending the flow path of the leaking liquid, and greatly reducing the risk of LNG leakage to the outside world. Furthermore, through the connection of the threaded pipe and the installation component, another sealing measure is added along the long flow path of the leaking liquid, thereby further reducing the risk of LNG leakage. When an LNG leakage occurs, the deep seal between the sealing tube and the sealing element is achieved through changes in the reaction element, achieving an automatic emergency handling effect for leakage situations, with higher economic benefits and safety. Attached Figure Description

[0015] Figure 1 This is a perspective view of the device after installation according to the first embodiment of this application;

[0016] Figure 2 This is a perspective view of the first embodiment of this application before installation;

[0017] Figure 3 This is a perspective view of the encapsulation tube and sealing element in the first embodiment of this application;

[0018] Figure 4 This is a side view of the encapsulation tube and seal before installation in the first embodiment of this application;

[0019] Figure 5 This is a schematic diagram of the side structure when the encapsulation tube and the seal are connected in the first embodiment of this application. Figure 1 ;

[0020] Figure 6 This is a schematic diagram of the side structure when the encapsulation tube and the seal are connected in the first embodiment of this application. Figure 2 ;

[0021] Figure 7 This is a schematic diagram of the side structure after installation in the first embodiment of this application;

[0022] Figure 8 This is a side view of the encapsulation tube and seal before installation in the second embodiment of this application;

[0023] Figure 9 for Figure 8 Schematic diagram of the structure at point A;

[0024] Figure 10 This is a side view of the encapsulation tube and seal after installation in the second embodiment of this application;

[0025] Figure 11This is a schematic diagram of the partial side structure of the deformation ring during LNG leakage in the second embodiment of this application.

[0026] Explanation of the labels in the diagram:

[0027] 1. Pipe body, 2. Encapsulation pipe, 201. Outer annular groove, 202. Inner reducing groove, 203. Extension groove, 204. Sliding groove, 3. Sealing element, 31. Rigid body, 32. Sealing layer one, 4. Threaded pipe, 5. Mounting element, 501. Threaded groove, 51. Intermediate body, 52. Sealing layer two, 6. Reaction element, 61. Deformation ring, 62. Thin ring, 63. Compression spring, 7. Slider. Detailed Implementation

[0028] The two embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0029] Implementation method 1:

[0030] This utility model provides a high-sealing transmission pipeline for LNG fuel systems in container ships. Please refer to [link / reference]. Figures 1-3 It includes multiple pipe bodies 1, with adjacent pairs of pipe bodies 1 connected by flanged encapsulation pipes 2, and a sealing element 3 connecting the pairs of encapsulation pipes 2. Each pair of encapsulation pipes 2 has an outer annular groove 201 at its closest end. Figure 4 As shown, an installation component 5 is fixedly connected to the inner wall of the outer annular groove 201 away from the groove opening. The end of the installation component 5 near the groove opening of the outer annular groove 201 has a threaded groove 501. The sealing component 3 includes a rigid body 31. The outer diameter of the rigid body 31 changes from increasing to decreasing along its axial direction, and the inner diameter of the rigid body 31 changes from decreasing to increasing along its axial direction. A sealing layer 32 is fixedly connected to both the inner and outer end faces of the rigid body 31. The sealing layer 32 is made of a low-temperature resistant elastic material, such as modified PTFE, which can withstand an environment of -200℃. Threaded pipes 4 are fixedly connected to both ends of the rigid body 31. The threaded pipes 4 are threadedly connected to the threaded groove 501. The rigid body 31, the threaded pipes 4, and the installation component 5 are all made of a low-temperature resistant rigid material, such as an alloy material.

[0031] The pair of pipe bodies 1 are connected by the encapsulation tube 2 and the seal 3 as follows:

[0032] Step 1, such as Figure 4 As shown, select a pair of encapsulation tubes 2 and a seal 3. First, insert one end of the seal 3 into one of the encapsulation tubes 2. The seal 3 and the threaded tube 4 enter the outer annular groove 201. When the threaded tube 4 reaches the threaded groove 501, rotate the seal 3 so that the threaded tube 4 is gradually threaded into the threaded groove 501, thereby completing the connection between the seal 3 and the first encapsulation tube 2.

[0033] Step Two, as follows Figure 5As shown, the encapsulated tube 2 with the seal 3 is welded to the outer end of a pipe body 1;

[0034] Step 3, as follows Figure 6 As shown, insert the other end of the seal 3 into the second encapsulation tube 2. When the threaded tube 4 reaches the threaded groove 501, rotate the encapsulation tube 2 to make the threaded tube 4 threadedly connected to the threaded groove 501. At this time, the threaded hole on the encapsulation tube 2 is aligned. Then, the pair of encapsulation tubes 2 are connected and fixed by the thread and nut.

[0035] Step 4, as follows Figure 7 As shown, another pipe body 1 is inserted into the inside of the second encapsulation tube 2, and then the encapsulation tube 2 is welded to the outer end of the pipe body 1.

[0036] Through the above operations, on the one hand, the connection and fixation of a pair of encapsulation tubes 2 realizes the connection and installation of a pair of pipe bodies 1. On the other hand, the sealing element 3 covers the outside of the interface gap of the pair of pipe bodies 1, effectively sealing the interface of the pipe body 1. The cooperation between the outer annular groove 201 and the sealing element 3 effectively extends the flow path when LNG leaks, thereby greatly reducing the risk of LNG leaking to the outside world. Furthermore, through the connection of the threaded pipe 4 and the mounting element 5, another sealing measure is added to the long flow path of the leaking liquid, thereby further reducing the risk of LNG leakage.

[0037] The second implementation method:

[0038] This embodiment adds the following structure based on the first embodiment: Please refer to Figure 8 and Figure 9An inner diameter-changing groove 202 is formed on the inner wall of the outer annular groove 201 away from the groove opening. The mounting component 5 is rotatably connected to the inside of the inner diameter-changing groove 202 (instead of the fixed setting of the mounting component 5 in the encapsulation tube 2 in the first embodiment). An extension groove 203 is formed on the inner wall of the inner diameter-changing groove 202 away from the groove opening of the outer annular groove 201. The reaction component 6 is provided inside the extension groove 203. The mounting component 5 includes an intermediate body 51. A second sealing layer 52 is fixedly connected to both the inner end face and the outer end face of the intermediate body 51. The second sealing layer 52 is made of the same material as the first sealing layer 32. A threaded groove 501 is provided in the intermediate body 5. 1. The surface of the sealing layer 52 is in close contact with the inner wall of the inner diameter groove 202. The inner wall of the outer ring of the inner diameter groove 202 is provided with multiple evenly distributed sliding grooves 204. Multiple sliders 7 are fixedly connected to the outer end face of the intermediate body 51. The multiple sliders 7 are slidably connected to the interior of the multiple sliding grooves 204. Through the setting of the sliders 7 and the sliding grooves 204, the mounting part 5 has a certain range of left and right movement in the inner diameter groove 202, while restricting the rotation of the mounting part 5, so that the threaded tube 4 can be normally threaded into the threaded groove 501, ensuring the smooth installation of the encapsulation tube 2 and the sealing part 3 in the first embodiment.

[0039] Please see Figure 9 The mounting component 5 includes a variable diameter section and a cylindrical section. The cylindrical section is located on the side closer to the reaction component 6. The slider 7 is located at the outer end of the cylindrical section. The variable diameter section is located on the side closer to the seal 3. The outer diameter of the variable diameter section gradually increases in the direction away from the seal 3, and its inner diameter gradually decreases in the direction away from the seal 3.

[0040] Please see Figure 9 The reaction element 6 includes a deformation ring 61 and a pair of thin rings 62 respectively disposed on the left and right sides of the deformation ring 61. The deformation ring 61 and the thin rings 62 are slidably connected to the inside of the extension groove 203. The thin ring 62 on the side away from the mounting element 5 is fixedly connected to the inner wall of the extension groove 203 with a plurality of evenly distributed compression springs 63. The deformation ring 61 includes a flexible bag and filler filling the flexible bag. The filler is made of a low-temperature expansion material, such as water. The flexible bag can be made of a low-temperature resistant flexible material, such as polytetrafluoroethylene film, which can withstand an environment of -200℃. The intermediate body 51, the thin ring 62, the compression springs 63 and the slider 7 are all made of low-temperature resistant alloy materials.

[0041] In the initial state, such as Figure 9 and Figure 10 As shown, the compression spring 63 is at its original length, and the thin ring 62 is in a pressureless contact state with the mounting part 5. In actual practice, the pipeline body 1 is made of thermal insulation material to keep the LNG in a low-temperature liquid state during transportation. At the same time, the encapsulation pipe 2 in this embodiment is also made of the same thermal insulation material as the pipeline body 1. Therefore, under normal circumstances, the deformation ring 61 is not affected by the low temperature of LNG and is in a liquid state.

[0042] When a leak occurs at the interface between a pair of pipe bodies 1, and the leaking LNG flows through the gap between the seal 3 and the outer annular groove 201, and the gap between the mounting part 5 and the inner diameter-changing groove 202, to the reaction part 6, the low temperature of the LNG is transferred to the deformation ring 61 through the thin ring 62, causing the water inside the deformation ring 61 to gradually freeze, and the deformation ring 61 to expand. Figure 11 As shown, the expanding deformation ring 61 pushes the thin ring 62 on one side to compress the compression spring 63. The compression spring 63 exerts a reaction force on the deformation ring 61. Therefore, the expanding deformation ring 61 pushes the thin ring 62 on the other side to compress the mounting part 5, which further improves the tightness of the fit between the variable diameter section on the mounting part 5 and the inner wall of the inner variable diameter groove 202, reducing the severity of leakage and even achieving a secondary sealing effect, thus enabling timely handling of leakage. At the same time, due to the compression of one end of the mounting part 5 by the reaction element 6, the sealing element 3 in the other encapsulation tube 2 will move towards the direction of the reaction element 6. At this time, the tightness of the fit between this part of the sealing element 3 and the corresponding outer annular groove 201 is further improved, making it less likely for leaked LNG to overflow from the gap between the other encapsulation tube 2 and the sealing element 3.

[0043] Compared to the first implementation method, although this implementation method increases the material cost to a certain extent, it also achieves the effect of automatic emergency response to leakage, and has higher economic benefits and safety.

[0044] In light of current practical needs, the above-described embodiments adopted in this application are not limited to these. Any changes made within the scope of knowledge possessed by those skilled in the art without departing from the concept of this application still fall within the protection scope of this utility model.

Claims

1. A high-sealing transmission pipeline for an LNG fuel system in a container ship, comprising a plurality of pipeline bodies (1), wherein adjacent pairs of pipeline bodies (1) are connected by a flanged encapsulated pipe (2), characterized in that: A sealing element (3) is connected between a pair of the encapsulation tubes (2). An outer annular groove (201) is opened at one end of each pair of encapsulation tubes (2) that is close to each other. An installation element (5) is connected to the inner wall of the outer annular groove (201) away from the groove opening. A threaded groove (501) is opened at one end of the installation element (5) that is close to the groove opening of the outer annular groove (201). The sealing element (3) includes a rigid body (31). The outer diameter of the rigid body (31) changes from increasing to decreasing along its axial direction. The inner diameter of the rigid body (31) changes from decreasing to increasing along its axial direction. A sealing layer (32) is fixedly connected to the inner end face and the outer end face of the rigid body (31). Threaded tubes (4) are fixedly connected to both the left and right ends of the rigid body (31). The threaded tubes (4) are threadedly connected to the threaded groove (501).

2. The high-sealing transmission pipeline for an LNG fuel system in a container ship according to claim 1, characterized in that: An inner diameter groove (202) is provided on the inner wall of the outer annular groove (201) away from the groove opening. The mounting component (5) is rotatably connected to the inside of the inner diameter groove (202). An extension groove (203) is provided on the inner wall of the inner diameter groove (202) away from the groove opening of the outer annular groove (201). A reaction component (6) is provided inside the extension groove (203).

3. A high-sealing transmission pipeline for an LNG fuel system in a container ship according to claim 2, characterized in that: The mounting component (5) includes an intermediate body (51), and a sealing layer (52) is fixedly connected to both the inner end face and the outer end face of the intermediate body (51). The threaded groove (501) is disposed on the intermediate body (51), and the surface of the sealing layer (52) is in close contact with the inner wall of the inner diameter groove (202).

4. A high-sealing transmission pipeline for an LNG fuel system in a container ship according to claim 2, characterized in that: The reaction element (6) includes a deformation ring (61) and a pair of thin rings (62) respectively disposed on the left and right sides of the deformation ring (61). The deformation ring (61) and the thin rings (62) are slidably connected to the inside of the extension groove (203). A plurality of uniformly distributed compression springs (63) are fixedly connected between the thin ring (62) away from the mounting element (5) and the inner wall of the extension groove (203).

5. A high-sealing transmission pipeline for an LNG fuel system in a container ship according to claim 3, characterized in that: The inner wall of the outer ring of the inner variable diameter groove (202) is provided with a plurality of evenly distributed sliding grooves (204), and the outer end face of the intermediate body (51) is fixedly connected with a plurality of sliders (7), and the plurality of sliders (7) are respectively slidably connected to the interior of the plurality of sliding grooves (204).

6. A high-sealing transmission pipeline for an LNG fuel system in a container ship according to claim 5, characterized in that: The mounting component (5) includes a variable diameter section and a cylindrical section. The cylindrical section is located on the side closer to the reaction component (6). The slider (7) is located at the outer end of the cylindrical section. The variable diameter section is located on the side closer to the seal (3). The outer diameter of the variable diameter section gradually increases in the direction away from the seal (3), and its inner diameter gradually decreases in the direction away from the seal (3).

7. A high-sealing transmission pipeline for an LNG fuel system in a container ship according to claim 4, characterized in that: The deformation ring (61) includes a flexible bag and a filler inside the flexible bag, the filler being made of a low-temperature expanding material.

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