Covering type tightness detection device for gas dome cylinder of large LNG (Liquefied Natural Gas) ship

Abstract

The utility model relates to a covering type tightness detection device for a gas dome cylinder of a large LNG ship, the LNG ship comprises a dome deck and an inner deck, and the inner deck is arranged below the dome deck; a cylindrical air dome cylinder is welded between the dome deck and the inner deck, detection openings are formed in the middle of the dome deck and the middle of the inner deck, an upper sealing gasket is arranged at the upper end of the dome deck, and an upper sealing plate is connected to the inner periphery of the upper sealing gasket. According to the utility model, the expansion tightness test of the dome cylinder of the large-scale LNG ship is carried out at the segmentation stage by using the two sealing plates, and the interior of the dome cylinder is sucked by combining the work of the vacuum pump, so that the quality of welding seams between the dome cylinder and the dome deck and the inner deck is effectively inspected, and the problem that the quality of the welding seams between the dome cylinder and the dome deck and the inner deck is poor is reduced. And the loss caused by later reworking and repairing is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of ship construction, in particular to a large-scale LNG ship air dome cylinder covering type tightness detection device. Background Art

[0002] As the international community's demand for energy conservation and emission reduction becomes increasingly strong, LNG ships have become a hot product in the shipping market in recent years, and orders for LNG ships have increased rapidly. Continuously improving the construction quality of LNG ships and reducing rework during the construction process will help shorten the ship construction cycle and improve the quality of ship construction, which is a top priority for shipbuilding companies.

[0003] As a special ship for carrying liquefied natural gas, LNG ships have many special equipment and structures. The gas dome is a structure unique to LNG ships, which is mainly used to collect and process the natural gas volatilized from the liquid cargo tanks of LNG ships. In the normal construction process, the gas dome cylinder will be welded to the dome deck and the inner deck in the segmentation stage, and then assembled and loaded. At the dock stage, helium tests are carried out on the welds between the gas dome cylinder and the dome deck and the inner deck to detect the welding quality of the relevant welds. However, if leaks are found in the welds between the gas dome cylinder and the structure at the dock stage, the leaks need to be polished, repaired, and repainted, which is time-consuming and labor-intensive, and may affect the safety of the insulation layer on the back of the inner deck, and the risk factor is high. Utility Model Content

[0004] In view of the deficiencies of the prior art, the utility model provides a large-scale LNG ship air dome cylinder covering type tightness detection device to solve the problems that may affect the safety of the insulation layer on the reverse side of the inner deck.

[0005] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] A large LNG ship gas dome cylinder covering type tightness detection device, the large LNG ship comprises a dome deck and an inner deck, the inner deck is arranged below the dome deck;

[0007] A cylindrical air dome body is welded between the dome deck and the inner deck, and detection ports are opened in the middle of the dome deck and the inner deck. An upper sealing gasket is provided at the upper end of the dome deck, and an upper sealing plate is connected to the inner periphery of the upper sealing gasket. A lower sealing gasket is provided at the lower end of the inner deck, and a lower sealing plate is connected to the inner periphery of the lower sealing gasket. A vacuum pump is provided outside the dome deck, and a vacuum hose is connected to the air suction port of the vacuum pump, and a vacuum joint is connected to the end of the vacuum hose, and the vacuum joint passes through the upper sealing plate.

[0008] Anti-dropping limiting components are provided on both sides of the lower end of the upper sealing plate and on both sides of the upper end of the lower sealing plate.

[0009] Preferably, the anti-slip limit assembly includes a fixed plate, a spring return rod and a tensioning block, the fixed plate is fixed to the lower end of the upper sealing plate, the spring return rod is fixed to the outside of the fixed plate, and the tensioning block is connected to the end of the spring return rod.

[0010] Preferably, the inner side surface of the tension block is inclined.

[0011] Preferably, the anti-disengagement limiting assembly also includes a fixed block, a spring return rod and a limit block, the fixed block is fixed to the end of the fixed plate, the spring return rod is fixed to the outside of the fixed block, and the limit block is connected to the end of the spring return rod.

[0012] Preferably, the upper and lower ends of the limit block are inclined.

[0013] Preferably, handles are fixed to the upper end of the upper sealing plate and the lower end of the lower sealing plate.

[0014] The utility model provides a large-scale LNG ship gas dome cylinder covering type tightness detection device, which has the following beneficial effects:

[0015] 1. The utility model provides an upper sealing plate and a lower sealing plate in the form of two sealing plates to carry out a tightness test on the gas dome cylinder of a large LNG ship in a segmented stage, and combines the work of a vacuum pump to suck the inside of the gas dome cylinder, so as to effectively inspect the quality of the welds between the gas dome cylinder and the dome deck and the inner deck, thereby reducing the loss caused by rework and repair in the later stage due to the poor quality of the welds between the gas dome cylinder and the dome deck and the inner deck.

[0016] 2. The tightness detection device of the utility model is tensioned on the inner walls of the detection ports of the dome deck and the inner deck by the tensioning plate, and the edge of the detection port opening is clamped by the limit block, which is conducive to making the upper sealing gasket fit tightly on the surface of the dome deck, and is conducive to making the lower sealing gasket fit tightly on the surface of the inner clamping plate, effectively improving the sealing of the upper and lower sealing plates installed on the upper and lower ends of the air dome cylinder, avoiding accidental air leakage during the detection process, and better ensuring the accuracy of the detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of a large-scale LNG ship gas dome cylinder covering type tightness detection device of the utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the upper sealing plate of the utility model;

[0019] Figure 3 This is a partial enlarged structural diagram of the utility model A;

[0020] Figure 4This is a schematic diagram of the partially enlarged structure of B of the utility model;

[0021] Figure 5 It is a schematic diagram of the overall split structure of the utility model.

[0022] Figure 1-5 In the middle: dome deck 1, inner deck 2, air dome cylinder 3, vacuum joint 4, upper sealing plate 5, lower sealing plate 6, vacuum hose 7, vacuum pump 8, upper sealing gasket 9, lower sealing gasket 10, handle 11, fixing plate 12, spring return rod 13, tensioning block 14, fixing block 15, spring return rod 16, limit block 17, detection port 18. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0024] Embodiment 1:

[0025] See also Figure 1-5 The utility model provides a large-scale LNG ship gas dome cylinder covering tightness detection device, on the large-scale LNG ship, including a dome deck 1 and an inner deck 2, the inner deck 2 is arranged below the dome deck 1, a cylindrical gas dome cylinder 3 is welded between the dome deck 1 and the inner deck 2, and a detection port 18 is opened in the middle of the dome deck 1 and the inner deck 2, an upper sealing gasket 9 is arranged at the upper end of the dome deck 1, and an upper sealing plate 5 is connected to the inner circumference of the upper sealing gasket 9, a lower sealing gasket 10 is arranged at the lower end of the inner deck 2, and a lower sealing plate 6 is connected to the inner circumference of the lower sealing gasket 10, a vacuum pump 8 is arranged outside the dome deck 1, and the vacuum port of the vacuum pump 8 is connected to a vacuum hose 7, and the end of the vacuum hose 7 is connected to a vacuum joint 4, and the vacuum joint 4 passes through the upper sealing plate 5.

[0026] By setting the upper sealing plate 5 and the lower sealing plate 6, the upper sealing plate 5 and the sealing plate cover the detection port 18, and the upper sealing gasket 9 and the lower sealing gasket 10 are used to improve the sealing performance when the upper sealing plate 5 and the lower sealing plate 6 cover the detection port 18, and then in the form of two sealing plates, a tightness test is carried out on the gas dome cylinder 3 of the large LNG ship in the segmented stage, and combined with the work of the vacuum pump 8, the inside of the gas dome cylinder 3 is sucked through the vacuum hose 7 and the vacuum joint 4, so as to effectively inspect the quality of the weld between the gas dome cylinder 3 and the dome deck 1 and the inner deck 2, thereby reducing the loss caused by the later rework and repair due to the poor quality of the weld between the gas dome cylinder 3 and the dome deck 1 and the inner deck 2.

[0027] Embodiment 2:

[0028] On the basis of Example 1, anti-slip limit assemblies are provided on both sides of the lower end of the upper sealing plate 5 and on both sides of the upper end of the lower sealing plate 6, and the anti-slip limit assemblies include a fixed plate 12, a spring return rod 13 and a tensioning block 14. The fixed plate 12 is fixed to the lower end of the upper sealing plate 5, the spring return rod 13 is fixed to the outer side of the fixed plate 12, the tensioning block 14 is connected to the end of the spring return rod 13, and the inner side surface of the tensioning block 14 is inclined. The anti-slip limit assemblies also include a fixed block 15, a spring return rod 16 and a limit block 17. The fixed block 15 is fixed to the end of the fixed plate 12, the spring return rod 16 is fixed to the outer side of the fixed block 15, the limit block 17 is connected to the end of the spring return rod 16, and the upper and lower ends of the limit block 17 are inclined.

[0029] In order to improve the sealing performance of the upper sealing plate 5 and the lower sealing plate 6 installed at the upper and lower ends of the gas dome cylinder 3, during the installation of the upper sealing plate 5 or the lower sealing plate 6, first, the inclined surface of the limit block 17 will slide into the detection port 18 along the opening of the detection port 18, at this time, the limit block 17 will compress the spring return rod 16, and at the same time, when the inclined surface of the tensioning block 14 slides into the detection port 18 along the opening of the detection port 18, the tensioning block 14 will compress the spring return rod 13, and then the rebound force of the spring return rod 13 will drive the tensioning block 14 to be tensioned on the dome. The inner wall of the detection port 18 of the top deck 1 and the inner deck 2, and the elastic force of the spring reset rod 16 will drive the limit block 17 to clamp the edge of the opening of the detection port 18. In summary, it is beneficial to make the upper sealing gasket 9 fit tightly to the surface of the dome deck 1, and it is beneficial to make the lower sealing gasket 10 fit tightly to the surface of the inner clamping plate, which effectively improves the sealing performance of the upper sealing plate 5 and the lower sealing plate 6 installed at the upper and lower ends of the air dome cylinder 3, avoids accidental air leakage during the detection process, and better ensures the accuracy of the detection results.

[0030] Embodiment three:

[0031] On the basis of the first embodiment, a handle 11 is fixed to the upper end of the upper sealing plate 5 and the lower end of the lower sealing plate 6 .

[0032] After the inspection of the gas dome cylinder 3 is completed, the upper sealing plate 5 or the lower sealing plate 6 is pulled out of the inspection port 18 by holding the handle 11. Since the tensioning block 14 is elastically tensioned on the inner wall of the inspection port 18, the tensioning block 14 can slide out of the inspection port 18. At the same time, the limit block 17 slides out of the inspection port 18 along the opening of the inspection port 18 through the inclined surface. At this time, the limit block 17 will compress the spring return rod 16 until the limit block 17 moves out of the inspection port 18. Therefore, the upper sealing plate 5 and the lower sealing plate 6 can be easily removed, so that the subsequent gas dome cylinder 3 can be inspected by the device.

[0033] When the upper sealing plate 5 and the lower sealing plate 6 are installed at the upper and lower ends of the gas dome cylinder 3, the inclined surface of the limit block 17 will slide into the detection port 18 along the opening of the detection port 18, and the limit block 17 will compress the spring return rod 16. At the same time, when the inclined surface of the tension block 14 slides into the detection port 18 along the opening of the detection port 18, the tension block 14 will compress the spring return rod 13, and then the rebound force of the spring return rod 13 will drive the tension block 14 to be tightened on the inner wall of the detection port 18 of the dome deck 1 and the inner deck 2. At the same time, the elastic force of the spring return rod 16 will drive the limit block 17 to clamp the edge of the opening of the detection port 18, so that the upper sealing plate 5 and the lower sealing plate 6 are firmly installed at the upper and lower ends of the gas dome cylinder 3.

[0034] Then, the vacuum pump 8 is operated to suck the inside of the gas dome cylinder 3 through the vacuum hose 7 and the vacuum joint 4. If there is air leakage in the weld, the vacuum pump 8 cannot suck the gas dome cylinder 3 into a vacuum state. If there is no air leakage in the weld, the vacuum pump 8 can suck the gas dome cylinder 3 into a vacuum state, effectively inspecting the quality of the welds between the gas dome cylinder 3 and the dome deck 1 and the inner deck 2.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A large LNG ship gas dome cylinder covering type tightness detection device, the large LNG ship comprises a dome deck (1) and an inner deck (2), the inner deck (2) is arranged below the dome deck (1), characterized in that: A cylindrical air dome body (3) is welded between the dome deck (1) and the inner deck (2), and a detection port (18) is opened in the middle of the dome deck (1) and the inner deck (2). An upper sealing gasket (9) is provided at the upper end of the dome deck (1), and an upper sealing plate (5) is connected to the inner periphery of the upper sealing gasket (9). A lower sealing gasket (10) is provided at the lower end of the inner deck (2), and a lower sealing plate (6) is connected to the inner periphery of the lower sealing gasket (10). A vacuum pump (8) is provided outside the dome deck (1), and an air suction port of the vacuum pump (8) is connected to a vacuum hose (7), and an end of the vacuum hose (7) is connected to a vacuum joint (4), and the vacuum joint (4) passes through the upper sealing plate (5); Anti-drop limiter components are provided on both sides of the lower end of the upper sealing plate (5) and on both sides of the upper end of the lower sealing plate (6).

2. A large-scale LNG ship air dome cylinder covering tightness detection device according to claim 1, characterized in that: The anti-dropping limiting components all comprise a fixed plate (12), a spring return rod (13) and a tensioning block (14); the fixed plate (12) is fixed to the lower end of the upper sealing plate (5); the spring return rod (13) is fixed to the outer side of the fixed plate (12); and the tensioning block (14) is connected to the end of the spring return rod (13).

3. A large-scale LNG ship air dome cylinder covering tightness detection device according to claim 2, characterized in that: The inner side surface of the tensioning block (14) is inclined.

4. A large-scale LNG ship air dome cylinder covering tightness detection device according to claim 2, characterized in that: The anti-dropping limiting assembly also includes a fixed block (15), a spring return rod (16) and a limit block (17); the fixed block (15) is fixed to the end of the fixed plate (12); the spring return rod (16) is fixed to the outside of the fixed block (15); and the limit block (17) is connected to the end of the spring return rod (16).

5. A large-scale LNG ship air dome cylinder covering tightness detection device according to claim 4, characterized in that: The upper and lower ends of the limit block (17) are both inclined.

6. A large-scale LNG ship air dome cylinder covering tightness detection device according to claim 1, characterized in that: A handle (11) is fixed to the upper end of the upper sealing plate (5) and the lower end of the lower sealing plate (6).

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