LNG double-wall pipe with elastic supporting structure

Abstract

The utility model relates to the technical field of gas pipeline equipment, in particular to an LNG (liquefied natural gas) double-wall pipe with an elastic supporting structure, which comprises an outer pipe and an inner pipe, a supporting component is mounted in the outer pipe and comprises a first fixed block, a first movable block is movably connected in the first fixed block, and a second movable block is mounted in the first movable block. The side surface of the first movable block is fixedly connected with an elastic cushion block, the side surface of the elastic cushion block is fixedly connected with a second movable block, the outer surface of the inner pipe is fixedly connected with a second fixed block, the front face of the elastic cushion block is fixedly connected with a bottom plate, the upper surface of the bottom plate is fixedly connected with a spring, and the upper end of the spring is fixedly connected with a clamping plate. The front face of the elastic cushion block is fixedly connected with a fixing shaft, and the front face of the second fixing block is fixedly connected with a check block. According to the double-wall pipe, elastic supporting connection is formed between the inner pipe and the outer pipe, buffering can be effectively carried out when a pipeline vibrates, connection failure between the inner pipe and the outer pipe caused by vibration impact is prevented, and use of the double-wall pipe is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of gas pipeline equipment, in particular to an LNG double-wall pipe with an elastic support structure. Background Art

[0002] LNG-powered ships have been vigorously promoted in the shipping industry due to their economic and environmental protection characteristics. The safety issue in the application of LNG as a power fuel on ships is a key concern in the system utilization. Among them, the protection treatment of the gas supply pipeline is of utmost importance. In general ship designs, intrinsically safe engine room designs are mostly adopted, which requires the gas supply pipeline to adopt a double-wall pipeline design. Natural gas flows through the inner pipe of the double-wall pipeline, and positive-pressure filling of inert gas or negative-pressure ventilation is mostly adopted between the inner pipe and the outer pipe.

[0003] In the existing technology at present, since the double-wall pipe usually fixes the inner pipe and the outer pipe by welding to form a rigid support connection, although this method has a simple structure, during the operation of the LNG gas supply system, the pipeline will vibrate, and the welding part will break and fail during the long-term vibration process, which is not convenient for the use of the double-wall pipe. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the disadvantages existing in the prior art, and to propose an LNG double-wall pipe with an elastic support structure.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme: an LNG double-wall pipe with an elastic support structure, including an outer pipe and an inner pipe. A support assembly is installed inside the outer pipe. The support assembly includes a first fixing block, the side surface of the first fixing block is fixedly connected to the inner surface of the outer pipe, a first movable block is movably connected inside the first fixing block, an elastic cushion block is fixedly connected to the side surface of the first movable block, a second movable block is fixedly connected to the side surface of the elastic cushion block, a second fixing block is fixedly connected to the outer surface of the inner pipe, the second movable block is located inside the second fixing block, a bottom plate is fixedly connected to the front surface of the elastic cushion block, a spring is fixedly connected to the upper surface of the bottom plate, the upper end of the spring is fixedly connected to a clamping plate, a fixing shaft is fixedly connected to the front surface of the elastic cushion block, the outer surface of the fixing shaft is movably connected to the inside of the clamping plate, and a stop block is fixedly connected to the front surface of the second fixing block.

[0006] As a further description of the above technical solution:

[0007] The number of the support assemblies is four, and the four support assemblies are rotationally symmetric about the center of the inner pipe.

[0008] As a further description of the above technical solution:

[0009] The elastic cushion block is made of rubber. The stop block is L-shaped, and the clamping plate is located inside the stop block.

[0010] As a further description of the above technical solution:

[0011] A first annular groove is formed on the inner surface of the inner tube. A first sealing gasket is fixedly connected to the surface of the first annular groove. A second annular groove is formed on the outer surface of the inner tube. A second sealing gasket is fixedly connected to the surface of the second annular groove.

[0012] As a further description of the above technical solution:

[0013] Connecting blocks are fixedly connected to the outer surface of the inner tube. The number of the connecting blocks is four. Thread grooves are formed on the upper surfaces of the four connecting blocks. A connecting plate is fixedly connected to the outer surface of the inner tube. The number of the connecting plates is four. First threaded holes are formed on the upper surfaces of the four connecting plates.

[0014] As a further description of the above technical solution:

[0015] Fixing plates are fixedly connected to the outer surface of the outer tube. The number of the fixing plates is eight. The eight fixing plates are divided into two groups and are respectively located at both ends of the outer tube. Second threaded holes are formed on the surfaces of the eight fixing plates.

[0016] The utility model has the following beneficial effects:

[0017] 1. Compared with the prior art, for this LNG double-wall pipe with an elastic support structure, through the support assembly, the first movable block and the second movable block on the elastic cushion block are respectively corresponded to and inserted into the first fixed block and the second fixed block. At the same time, press one side of the clamping plate to make the clamping plate tilt up. When the elastic cushion block is completely inserted, release the clamping plate. Under the action of the spring, the tilted side of the clamping plate drops and is stuck in the stop block to fix the elastic cushion block. Compared with the current existing technology, since the inner tube and the outer tube of the double-wall pipe are usually fixed by welding to form a rigid support connection, although this method has a simple structure, during the operation of the LNG gas supply system, the pipeline will vibrate, and the welding part will break and fail during long-term vibration, which is not convenient for the use of the double-wall pipe. This LNG double-wall pipe with an elastic support structure forms an elastic support connection between the inner tube and the outer tube, can effectively buffer during pipeline vibration, and prevent the connection between the inner tube and the outer tube from failing due to vibration impact, which is convenient for the use of the double-wall pipe.

[0018] 2. Compared with the prior art, for the LNG double-wall pipe with an elastic support structure, through the first movable block, the second movable block, the spring, the clamping plate and the stop block, pressing the clamping plate to make one end of it tilt up and separate from the stop block, the first movable block and the second movable block can drive the elastic cushion block to be pulled out. Thus, when the components inside the pipeline are damaged and need to be replaced, only the damaged components need to be replaced, without replacing the whole pipeline, reducing the pipeline maintenance cost. Moreover, the disassembly and assembly are simple, time-saving and labor-saving, saving time and facilitating replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 FIG. 6 is an overall structural schematic diagram of the first perspective of an LNG double-wall pipe with an elastic support structure proposed by the present utility model;

[0020] Figure 2 FIG. 10 is an overall structural schematic diagram of the second perspective of an LNG double-wall pipe with an elastic support structure proposed by the present utility model;

[0021] Figure 3 FIG. 14 is a partial cross-sectional view of an LNG double-wall pipe with an elastic support structure proposed by the present utility model;

[0022] Figure 4 FIG. 18 is an enlarged view of the structure at A of an LNG double-wall pipe with an elastic support structure proposed by the present utility model; Figure 3 FIG. 20 is an enlarged view of the structure at A of an LNG double-wall pipe with an elastic support structure proposed by the present utility model;

[0023] Figure 5 FIG. 24 is a half-sectional view of an LNG double-wall pipe with an elastic support structure proposed by the present utility model;

[0024] Figure 6 FIG. 28 is a cross-sectional view of the connection relationship between the outer pipe and the inner pipe of an LNG double-wall pipe with an elastic support structure proposed by the present utility model;

[0025] Figure 7 FIG. 32 is an enlarged view of the structure at B of an LNG double-wall pipe with an elastic support structure proposed by the present utility model; Figure 6 FIG. 34 is an enlarged view of the structure at B of an LNG double-wall pipe with an elastic support structure proposed by the present utility model;

[0026] LEGEND DESCRIPTION:

[0027] 1. Outer pipe; 2. Inner pipe; 3. Support assembly; 301. First fixing block; 302. First movable block; 303. Elastic cushion block; 304. Second movable block; 305. Second fixing block; 306. Bottom plate; 307. Spring; 308. Clamping plate; 309. Fixed shaft; 310. Stop block; 4. First annular groove; 5. First sealing gasket; 6. Second annular groove; 7. Second sealing gasket; 8. Connecting block; 9. Threaded groove; 10. Connecting plate; 11. First threaded hole; 12. Fixing plate; 13. Second threaded hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] Referring to Figures 1-7 , a kind of LNG double-wall pipe with an elastic support structure provided by the utility model: It includes an outer pipe 1 and an inner pipe 2. A support assembly 3 is installed inside the outer pipe 1. The support assembly 3 includes a first fixed block 301. The side surface of the first fixed block 301 is fixedly connected to the inner surface of the outer pipe 1. A first movable block 302 is movably connected inside the first fixed block 301. A side surface of the first movable block 302 is fixedly connected to an elastic cushion block 303. A side surface of the elastic cushion block 303 is fixedly connected to a second movable block 304. A second fixed block 305 is fixedly connected to the outer surface of the inner pipe 2. The second movable block 304 is located inside the second fixed block 305. A bottom plate 306 is fixedly connected to the front surface of the elastic cushion block 303. A spring 307 is fixedly connected to the upper surface of the bottom plate 306. The upper end of the spring 307 is fixedly connected to a clamping plate 308. A fixed shaft 309 is fixedly connected to the front surface of the elastic cushion block 303. The outer surface of the fixed shaft 309 is movably connected to the inside of the clamping plate 308. A stop block 310 is fixedly connected to the front surface of the second fixed block 305. The number of the support assemblies 3 is four. The four support assemblies 3 are rotationally symmetric around the center of the inner pipe 2. The first fixed block 301 and the second fixed block 305 are provided with convex grooves. The first movable block 302 and the second movable block 304 are convex blocks, and their sizes match the convex grooves. The first movable block 302 and the second movable block 304 are respectively inserted into the convex grooves of the first fixed block 301 and the second fixed block 305 for installation and connection. The elastic cushion block 303 is made of rubber material. The stop block 310 is L-shaped. The clamping plate 308 is located inside the stop block 310. During installation, the first movable block 302 and the second movable block 304 on the elastic cushion block 303 are respectively corresponded to and inserted into the first fixed block 301 and the second fixed block 305. At the same time, press one side of the clamping plate 308 to make the clamping plate 308 tilt up. When the elastic cushion block 303 is completely inserted, release the clamping plate 308. Under the action of the spring 307, the tilted side of the clamping plate 308 descends and is stuck inside the stop block 310 to fix the elastic cushion block 303 and complete the installation. During disassembly, press the clamping plate 308 to make one end of it tilt up and separate from the stop block 310, then the first movable block 302 and the second movable block 304 can drive the elastic cushion block 303 to be pulled out for replacement.

[0029] The inner surface of the inner tube 2 is provided with a first annular groove 4, and a first gasket 5 is fixedly connected to the surface of the first annular groove 4. The outer surface of the inner tube 2 is provided with a second annular groove 6, and a second gasket 7 is fixedly connected to the surface of the second annular groove 6. The outer surface of the inner tube 2 is fixedly connected with connecting blocks 8, and the number of the connecting blocks 8 is four. Thread grooves 9 are formed on the upper surfaces of the four connecting blocks 8. The outer surface of the inner tube 2 is fixedly connected with connecting plates 10, and the number of the connecting plates 10 is four. First threaded holes 11 are formed on the upper surfaces of the four connecting plates 10. The positions of the connecting plates 10 correspond to those of the connecting blocks 8, and the positions of the thread grooves 9 correspond to those of the first threaded holes 11. The thread grooves 9 and the first threaded holes 11 are connected by bolts, so as to fix the two sections of the inner tube 2. The outer surface of the outer tube 1 is fixedly connected with fixing plates 12, and the number of the fixing plates 12 is eight. The eight fixing plates 12 are divided into two groups and are respectively located at both ends of the outer tube 1. Second threaded holes 13 are formed on the surfaces of the eight fixing plates 12. The two sections of the inner tube 2 to be connected are respectively placed inside the two sections of the outer tube 1. First, the two sections of the inner tube 2 are aligned. The second annular groove 6 on one section of the inner tube 2 is inserted into the first annular groove 4 on the other section of the inner tube 2, so that the second gasket 7 is in contact with the first gasket 5. At the same time, the connecting plate 10 on one section of the inner tube 2 corresponds to the connecting block 8 on the other section of the inner tube 2. The bolts are respectively threadedly connected with the first threaded holes 11 and the thread grooves 9, so as to connect and fix the two sections of the inner tube 2. Finally, the two sections of the outer tube 1 are aligned, so that the fixing plates 12 on the two sections of the outer tube 1 correspond to each other. The bolts are respectively threadedly connected with the second threaded holes 13 on the two fixing plates 12, so as to connect and fix the two sections of the outer tube 1, and the overall connection and fixation are completed.

[0030] Working principle: During installation, first place the two inner pipes 2 to be connected into the two outer pipes 1 respectively. Then align the two inner pipes 2, insert the second annular groove 6 on one inner pipe 2 into the first annular groove 4 on the other inner pipe 2, so that the second gasket 7 fits with the first gasket 5. At the same time, align the connecting plate 10 on one inner pipe 2 with the connecting block 8 on the other inner pipe 2, and thread the bolts into the first threaded hole 11 and the threaded groove 9 respectively, thereby connecting and fixing the two inner pipes 2. Then, align and insert the first movable block 302 and the second movable block 304 on the elastic cushion block 303 with the first fixed block 301 and the second fixed block 305 respectively. At the same time, press one side of the clamping plate 308 to make the clamping plate 308 tilt up. When the elastic cushion block 303 is completely inserted, release the clamping plate 308. Under the action of the spring 307, the tilted side of the clamping plate 308 drops and gets stuck in the stop block 310, fixing the elastic cushion block 303 to complete the installation. Finally, align the two outer pipes 1 so that the fixing plates 12 on the two outer pipes 1 are aligned, and thread the bolts into the second threaded holes 13 on the two fixing plates 12 respectively, thereby connecting and fixing the two outer pipes 1 to complete the overall connection and fixing. When maintenance and replacement are required, unscrew the bolts on the fixing plate 12, separate the outer pipes 1, and then the interior can be repaired, and the parts to be replaced can be removed and replaced, which is time-saving and labor-saving.

[0031] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An LNG double-wall pipe with an elastic support structure, comprising an outer pipe (1) and an inner pipe (2), characterized in that: A support assembly (3) is installed inside the outer tube (1). The support assembly (3) includes a first fixed block (301). The side surface of the first fixed block (301) is fixedly connected to the inner surface of the outer tube (1). A first movable block (302) is movably connected inside the first fixed block (301). An elastic cushion block (303) is fixedly connected to the side surface of the first movable block (302). A second movable block (304) is fixedly connected to the side surface of the elastic cushion block (303). A second fixed block (305) is fixedly connected to the outer surface of the inner tube (2). The second movable block (304) is located inside the second fixed block (305). A bottom plate (306) is fixedly connected to the front surface of the elastic cushion block (303). A spring (307) is fixedly connected to the upper surface of the bottom plate (306). The upper end of the spring (307) is fixedly connected to a clamping plate (308). A fixed shaft (309) is fixedly connected to the front surface of the elastic cushion block (303). The outer surface of the fixed shaft (309) is movably connected to the inside of the clamping plate (308). A stop block (310) is fixedly connected to the front surface of the second fixed block (305).

2. The LNG double-wall pipe with an elastic support structure according to claim 1, characterized in that: The number of the support assemblies (3) is four, and the four support assemblies (3) are rotationally symmetric about the center of the inner tube (2).

3. The LNG double-wall pipe with an elastic support structure according to claim 1, characterized in that: The elastic cushion block (303) is made of rubber. The stop block (310) is L-shaped, and the clamping plate (308) is located inside the stop block (310).

4. A kind of LNG double-wall pipe with an elastic support structure according to claim 1, characterized in that: A first annular groove (4) is formed on the inner surface of the inner tube (2), and a first sealing gasket (5) is fixedly connected to the surface of the first annular groove (4). A second annular groove (6) is formed on the outer surface of the inner tube (2), and a second sealing gasket (7) is fixedly connected to the surface of the second annular groove (6).

5. The LNG double-wall pipe with an elastic support structure according to claim 1, wherein: A connecting block (8) is fixedly connected to the outer surface of the inner tube (2). The number of the connecting blocks (8) is four. Thread grooves (9) are formed on the upper surfaces of the four connecting blocks (8). A connecting plate (10) is fixedly connected to the outer surface of the inner tube (2). The number of the connecting plates (10) is four. First threaded holes (11) are formed on the upper surfaces of the four connecting plates (10).

6. The LNG double-wall pipe with an elastic support structure according to claim 1, wherein: A fixing plate (12) is fixedly connected to the outer surface of the outer tube (1). The number of the fixing plates (12) is eight. The eight fixing plates (12) are divided into two groups and are respectively located at both ends of the outer tube (1). Second threaded holes (13) are formed on the surfaces of the eight fixing plates (12).

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