A tanker cargo tank based on inert gas protection

Abstract

This utility model discloses an inert gas-protected cargo oil tank for use in the marine industry. It includes a cargo oil tank body and an inlet pipe fixedly connected to the cargo oil tank body for introducing inert gas into the cargo oil tank body. An exhaust pipe is fixedly connected to the upper end of a ventilation box. Through the ventilation box and its internal structure including a pressure sensor, a fixed magnetic frame, a flat plate, and a moving magnetic frame, the volatile oil and gas can push the flat plate and the moving magnetic frame upwards until a change in the pressure sensor data is triggered, thus determining the degree of oil and gas volatilization. Subsequently, a ventilation operation is initiated, allowing the oil and gas in the cargo oil tank body to be discharged through the ventilation box and inert gas to be replenished. This reduces the internal air pressure of the cargo oil tank body and effectively reduces the volume percentage of oil and gas and inert gas, thereby reducing the risk of fire and explosion on the oil tanker.

Description

Technical Field

[0001] This utility model relates to the field of shipbuilding, and in particular to an oil tanker cargo oil tank based on inert gas protection. Background Technology

[0002] During the transportation of oil tankers, the oil will continuously evaporate due to changes in ambient temperature and the rocking of the tanker during operation. When the oil vapor and oxygen in the upper part of the liquid cargo tank reach a certain concentration, they may cause a fire or explosion due to the action of heat sources, static electricity, etc.

[0003] Existing oil tankers mostly maintain the oil-gas balance by filling the cargo tanks with inert gas and venting the gas to the atmosphere through the ship's breather valves and their assemblies. Specifically, a certain amount of inert gas is injected into the upper part of the cargo tank space to reduce the volume percentage of oil vapor and oxygen to a certain ratio, preventing fires or explosions. As the oil in the cargo tanks continuously evaporates, the pressure of the mixed gas increases. When the pressure exceeds the opening pressure of the breather valve, the valve automatically opens, and the mixed gas is discharged overboard. The valve automatically closes when the pressure drops to the closing pressure, effectively reducing the risk of fire and explosion on the oil tanker and ensuring the safety of the ship and its personnel.

[0004] However, during the aforementioned process, the repeated opening of the breather valve, while expelling excessive oil and gas, also expelled inert gas, causing the ratio of oil and gas to inert gas in the cargo tank to continuously increase, posing a significant risk of fire or explosion in the later stages. Utility Model Content

[0005] The core of this utility model lies in the fact that by setting up the air exchange box and its internal pressure sensor, fixed magnetic frame, flat plate, moving magnetic frame and other structures, the air exchange operation of oil and gas in the cargo oil tank body is realized, the internal air pressure of the cargo oil tank body is reduced, and the volume percentage of oil and gas and inert gas is reduced, thus solving the problem of the reduction of inert gas content caused by the discharge of oil and gas through the breather valve in the prior art.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] An inert gas-protected cargo oil tanker includes a cargo oil tank body and an air inlet pipe fixedly connected to the cargo oil tank body for introducing inert gas into the cargo oil tank body. An air exchange box is fixedly connected to the upper end of the cargo oil tank body, and an exhaust pipe is fixedly connected to the upper end of the air exchange box. A hydraulic cylinder is fixedly connected to the center of the upper end of the air exchange box. The telescopic end of the hydraulic cylinder moves through the top of the air exchange box and extends to its inner side. The interior of the air exchange box is provided with a top frame, a moving magnetic frame, a buffer pad, a flat plate, and a fixed magnetic frame from top to bottom. Multiple evenly distributed pressure sensors are fixedly connected to the lower end of the top frame, with the sensing ends of the pressure sensors facing downwards. A soft cloth is fixedly connected between the moving magnetic frame and the flat plate. A first magnetic ring is provided on the inner side of the moving magnetic frame, and multiple connecting rods are fixedly connected between the moving magnetic frame and the first magnetic ring. A second magnetic ring located directly below the first magnetic ring is fixedly connected to the upper end of the flat plate.

[0008] Furthermore, the top frame is fixedly connected to the inner top of the air exchange box, the fixed magnetic frame is fixedly connected to the inner wall of the top frame, and the side end of the moving magnetic frame is slidably connected to the inner wall of the top frame, with both in a sliding sealed state.

[0009] Furthermore, the buffer pad is fixedly connected to the lower end of the moving magnetic frame. The inner length of the fixed magnetic frame, the moving magnetic frame, and the buffer pad are all greater than the length of the flat plate, and the inner width of the three is greater than the width of the flat plate. The inner length and inner width of the moving magnetic frame are greater than the inner length and inner width of the buffer pad, respectively. The soft cloth is located on the inner side of the buffer pad.

[0010] Furthermore, the upper end of the flat plate is provided with multiple spiral grooves, and multiple soft cloths correspond one-to-one with the multiple spiral grooves, and the lower end of the soft cloths is fixedly connected to the inner bottom surface of the spiral grooves.

[0011] Furthermore, the first magnetic ring is located at the center of the moving magnetic frame and directly below the hydraulic cylinder, and the inner diameter of the first magnetic ring is larger than the outer diameter of the telescopic end of the hydraulic cylinder.

[0012] Optionally, the outer side of the sensing end of the pressure sensor is provided with a flexible sleeve that is fixedly connected to the top frame, and the inside of the flexible sleeve is filled with a soft layer.

[0013] Compared with existing technologies, the advantages of this utility model are:

[0014] This solution utilizes a ventilation box and its internal pressure sensor, fixed magnetic frame, flat plate, and moving magnetic frame to allow volatile oil and gas to push the flat plate and moving magnetic frame upwards until they trigger a change in the pressure sensor data. This determines the degree of oil and gas volatilization, and then the ventilation operation is initiated. This allows the oil and gas in the cargo oil tank to be discharged through the ventilation box, while inert gas is added to the cargo oil tank. This reduces the internal air pressure of the cargo oil tank and effectively decreases the volume percentage of oil, gas, and inert gas, thereby reducing the risk of fire and explosion on the oil tanker. Attached Figure Description

[0015] Figure 1 This is a perspective view of the present utility model;

[0016] Figure 2 This is a partial perspective view of the ventilation box of this utility model;

[0017] Figure 3 This is a perspective view of the planar plate and the moving magnet frame of this utility model;

[0018] Figure 4 This is a front structural diagram of the present invention;

[0019] Figure 5 This is a front view of the ventilation box of this utility model in its initial state.

[0020] Figure 6 This is a schematic diagram of the front structure of the planar plate of this utility model when it is moving. Figure 1 ;

[0021] Figure 7 This is a schematic diagram of the front structure of the planar plate of this utility model when it is moving. Figure 2 ;

[0022] Figure 8 This is a schematic diagram of the front structure of the planar plate of this utility model when it is moving. Figure 3 ;

[0023] Figure 9 This is a front view of the ventilation box of this utility model during ventilation.

[0024] Figure 10 This is a schematic diagram of the front structure of the planar plate of this utility model when it is moving. Figure 4 ;

[0025] Figure 11 This is a schematic diagram of the front structure of the planar plate of this utility model when it returns to its initial position;

[0026] Figure 12 for Figure 11 A schematic diagram of the structure at point A in the middle.

[0027] Explanation of the labels in the diagram:

[0028] 1 Cargo oil tank body, 101 Air inlet pipe, 2 Air exchange box, 201 Exhaust pipe, 3 Hydraulic cylinder, 4 Top frame, 401 Pressure sensor, 402 Flexible sleeve, 403 Soft layer, 5 Fixed magnetic frame, 6 Flat plate, 601 U-shaped groove, 7 Moving magnetic frame, 8 Buffer pad, 9 Soft cloth, 10 Connecting rod, 11 First magnetic ring, 12 Second magnetic ring. Detailed Implementation

[0029] The technical solution will now be clearly and completely described with reference to the accompanying drawings in the embodiments of this utility model.

[0030] First implementation method:

[0031] Please see Figure 1 An inert gas-protected cargo oil tanker includes a cargo oil tank body 1 and an inlet pipe 101 fixedly connected to the cargo oil tank body 1 for introducing inert gas into the cargo oil tank body 1. The inlet pipe 101 is located above the crude oil surface. The end of the inlet pipe 101 away from the cargo oil tank body 1 is connected to an inert gas generator on the oil tanker. The inert gas generated by the inert gas generator can be transported to the cargo oil tank body 1 through the inlet pipe 101 to replace the original hazardous gases in the cargo oil tank body 1, such as evaporated oil vapors. The inert gas generator is a standard configuration of oil tankers and belongs to the prior art. It usually includes components such as fuel tanks, burners, cooling towers and pumps. This application does not involve improvements to it, so it will not be described in detail.

[0032] Please see Figures 1-4 The upper end of the cargo oil tank body 1 is fixedly connected to an air exchange box 2, and the upper end of the air exchange box 2 is fixedly connected to an exhaust pipe 201. A hydraulic cylinder 3 is fixedly connected to the center of the upper end of the air exchange box 2. The telescopic end of the hydraulic cylinder 3 moves through the top of the air exchange box 2 and extends to its inner side. The interior of the air exchange box 2 is provided with a top frame 4, a moving magnetic frame 7, a buffer pad 8, a flat plate 6 and a fixed magnetic frame 5 from top to bottom. The lower end of the top frame 4 is fixedly connected to a plurality of evenly distributed pressure sensors 401, and the sensing end of the pressure sensors 401 faces downward. The air exchange box 2 and the pressure sensors 401 are electrically connected to a controller installed outside the cargo oil tank body 1. A soft cloth 9 is fixedly connected between the moving magnetic frame 7 and the flat plate 6. The inner side of the moving magnetic frame 7 is provided with a first magnetic ring 11, and a plurality of connecting rods 10 are fixedly connected between the moving magnetic frame 7 and the first magnetic ring 11. The upper end of the flat plate 6 is fixedly connected to a second magnetic ring 12 located directly below the first magnetic ring 11.

[0033] The top frame 4 is fixedly connected to the inner top of the ventilation box 2. The fixed magnetic frame 5 is fixedly connected to the inner wall of the top frame 4. The side end of the moving magnetic frame 7 is slidably connected to the inner wall of the top frame 4, and the two are in a sliding sealing state. The buffer pad 8 is fixedly connected to the lower end of the moving magnetic frame 7. The inner length of the fixed magnetic frame 5, the moving magnetic frame 7 and the buffer pad 8 are all greater than the length of the flat plate 6, and the inner width of the three are all greater than the width of the flat plate 6. The inner length and inner width of the moving magnetic frame 7 are greater than the inner length and inner width of the buffer pad 8, respectively. The soft cloth 9 is located inside the buffer pad 8. The buffer pad 8 is used to improve the sealing between the flat plate 6 and the moving magnetic frame 7 and reduce the impact force when the two come into contact. The first magnetic ring 11 is located at the center of the moving magnetic frame 7 and is also located directly below the hydraulic cylinder 3. The inner diameter of the first magnetic ring 11 is greater than the outer diameter of the telescopic end of the hydraulic cylinder 3. When the hydraulic cylinder 3 starts to extend, its telescopic end can pass through the inner side of the first magnetic ring 11 and push the flat plate 6.

[0034] The working principle of this application is as follows:

[0035] Initial state: such as Figure 5 As shown, under the magnetic attraction of the first magnetic ring 11 and the second magnetic ring 12, the flat plate 6 and the buffer pad 8 are tightly attached. At the same time, under the magnetic attraction of the moving magnetic frame 7 and the fixed magnetic frame 5, the flat plate 6 and the fixed magnetic frame 5 are tightly attached.

[0036] Process 1: As Figure 6 As shown, when the crude oil in the cargo oil tank body 1 gradually evaporates and produces oil vapor, the air pressure in the cargo oil tank body 1 increases, and overcomes the friction between the moving magnetic frame 7 and the inner wall of the air exchange box 2, pushing the adsorbed flat plate 6 and the moving magnetic frame 7 upward, and the gas in the space above the flat plate 6 is discharged through the exhaust pipe 201.

[0037] The automatic movement of the flat plate 6 can maintain the air pressure stability in the cargo oil tank body 1 on the one hand, and trigger the data change of the pressure sensor 401 on the other hand (see process two in the next section for details).

[0038] Process Two: Figure 7 As shown, when the planar plate 6 and the moving magnetic frame 7 move to the top position, they will exert a squeezing force on the sensing end of the pressure sensor 401, causing a significant change in the data of the pressure sensor 401. At this time, as... Figure 8 As shown, the hydraulic cylinder 3 is activated by the controller, and the hydraulic cylinder 3 extends downward, slowly pushing the flat plate 6 downward. Since the friction between the moving magnetic frame 7 and the inner wall of the air exchange box 2 is greater than the magnetic attraction between the first magnetic ring 11 and the second magnetic ring 12, the moving magnetic frame 7 remains stable in the initial stage of the downward movement of the flat plate 6. As the distance between the flat plate 6 and the moving magnetic frame 7 gradually increases, and the soft cloth 9 between them is straightened, the flat plate 6 moves downward together with the moving magnetic frame 7 under the action of the soft cloth 9.

[0039] Process 3: such as Figure 9As shown, when the hydraulic cylinder 3 extends to the set stroke (which is preset by those skilled in the art), the hydraulic cylinder 3 is closed, and its length remains unchanged, so that the flat plate 6 and the moving magnetic frame 7 remain in the middle position of the air exchange box 2 (at this position, the magnetic attraction of the fixed magnetic frame 5 to the moving magnetic frame 7 is small and insufficient to overcome the friction between the moving magnetic frame 7 and the cargo oil tank body 1, so the position of the moving magnetic frame 7 can remain stable). Then, inert gas is injected into the cargo oil tank body 1 through the air inlet pipe 101, causing the oil-laden gas in the cargo oil tank body 1 to be driven upward and enter the air exchange box 2. Subsequently, it passes through the gap between the flat plate 6 and the cargo oil tank body 1 and the gap between the flat plate 6 and the moving magnetic frame 7, reaching the upper space of the moving magnetic frame 7. Finally, it is discharged and collected through the exhaust pipe 201. Through the above air exchange process, the gas in the cargo oil tank body 1 is effectively replaced, greatly reducing the concentration of oil-laden gas in the cargo oil tank body 1. In addition, the injection rate and duration of the inert gas in the air inlet pipe 101 are also preset by those skilled in the art.

[0040] Step 4: After completing Step 3, combine... Figures 9-10 As shown, continue to start hydraulic cylinder 3, pushing the flat plate 6 downwards. The flat plate 6 drives the moving magnetic frame 7 to continue approaching the fixed magnetic frame 5. When the magnetic attraction of the fixed magnetic frame 5 to the moving magnetic frame 7 increases to a level sufficient to overcome the friction between the moving magnetic frame 7 and the inner wall of the air exchange box 2 (at this time, the flat plate 6 is not in contact with the fixed magnetic frame 5), under the action of magnetic attraction, the moving magnetic frame 7 actively moves downwards. Therefore, when the flat plate 6 reaches the upper end of the fixed magnetic frame 5, the moving magnetic frame 7 and the buffer pad 8 also adhere tightly to the upper end of the flat plate 6 under the magnetic force of the fixed magnetic frame 5, thus returning to the initial position (as shown). Figure 10 As shown), the hydraulic cylinder 3 is activated to retract, returning to the initial state, so that the flat plate 6 can move upward again due to the evaporation of oil and gas, thus realizing the perception of the degree of oil and gas evaporation.

[0041] Supplementary Explanation: The end of the exhaust pipe 201 furthest from the air exchange box 2 is connected to the outside world and the recovery device via a pair of pipes, each of which is fixedly connected to a solenoid valve, designated as solenoid valve M and solenoid valve N, respectively, and both are connected to the controller. In processes one and two, solenoid valve M on the pipe connecting the exhaust pipe 201 to the outside world is opened, while solenoid valve N between the exhaust pipe 201 and the recovery device is closed. During the upward or downward movement of the plane plate 6, the upper space of the plane plate 6 maintains air pressure balance with the outside world. During the air exchange process in process three, solenoid valve M is closed and solenoid valve N is opened, allowing oil and gas to enter the recovery device for treatment before being discharged, reducing environmental pollution. In process four, solenoid valve M is opened again, and solenoid valve N is closed.

[0042] Please see Figure 3 and Figure 5The upper end of the flat plate 6 is provided with multiple spiral grooves 601, and multiple soft cloths 9 correspond one-to-one with the multiple spiral grooves 601. The lower end of the soft cloth 9 is fixedly connected to the inner bottom surface of the spiral groove 601. When the flat plate 6 and the buffer pad 8 are attached, the spiral groove 601 can be used to accommodate and store the soft cloth 9 in a relaxed state.

[0043] Second implementation method:

[0044] This embodiment adds the following structure based on the first embodiment: Please refer to Figure 11 and Figure 12 The pressure sensor 401 has a flexible sleeve 402 fixedly connected to the top frame 4 on the outside of the sensing end. The flexible sleeve 402 is filled with a soft layer 403. The flexible sleeve 402 can be made of silicone material and its outer surface is coated with an anti-corrosion coating. The soft layer 403 can be made of flexible rubber. In the initial state, the soft layer 403 does not contact the sensing end of the pressure sensor 401.

[0045] The flexible sleeve 402 and soft layer 403 provide safety protection for the pressure sensor 401. On the one hand, they reduce the direct impact on the sensing end of the pressure sensor 401 when the flat plate 6 and the moving magnetic frame 7 move to the top. In this embodiment, the moving magnetic frame 7 directly squeezes the flexible sleeve 402 and soft layer 403, causing them to deform and thus generating pressure on the sensing end of the pressure sensor 401, causing its data to change. On the other hand, the flexible sleeve 402 and soft layer 403 isolate the pressure sensor 401 from the oil and gas. During the ventilation process in process three, the gas carrying oil and gas is less likely to come into direct contact with the pressure sensor 401 when it is discharged through the ventilation box 2, effectively reducing the pollution and corrosion of the pressure sensor 401 by oil and gas.

[0046] The above description is merely a preferred embodiment of this utility model; it encompasses all the protection scope of this utility model. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be covered within the protection scope of this utility model.

Claims

1. An inert gas-protected cargo oil tanker, comprising a cargo oil tank body (1) and an air inlet pipe (101) fixedly connected to the cargo oil tank body (1) and used for introducing inert gas into the cargo oil tank body (1), characterized in that: The upper end of the cargo oil tank body (1) is fixedly connected to a ventilation box (2), and the upper end of the ventilation box (2) is fixedly connected to an exhaust pipe (201). A hydraulic cylinder (3) is fixedly connected to the center of the upper end of the ventilation box (2). The telescopic end of the hydraulic cylinder (3) moves through the top of the ventilation box (2) and extends to its inner side. The interior of the ventilation box (2) is provided with a top frame (4), a moving magnetic frame (7), a buffer pad (8), a flat plate (6), and a fixed magnetic frame (5) from top to bottom. 4) The lower end is fixedly connected to a plurality of evenly distributed pressure sensors (401), and the sensing end of the pressure sensor (401) faces downward. A soft cloth (9) is fixedly connected between the moving magnetic frame (7) and the flat panel (6). A first magnetic ring (11) is provided on the inner side of the moving magnetic frame (7), and a plurality of connecting rods (10) are fixedly connected between the moving magnetic frame (7) and the first magnetic ring (11). A second magnetic ring (12) located directly below the first magnetic ring (11) is fixedly connected to the upper end of the flat panel (6).

2. The oil tanker cargo oil tank based on inert gas protection according to claim 1, characterized in that: The top frame (4) is fixedly connected to the inner top of the ventilation box (2), the fixed magnetic frame (5) is fixedly connected to the inner wall of the top frame (4), and the side end of the moving magnetic frame (7) is slidably connected to the inner wall of the top frame (4), and the two are in a sliding sealed state.

3. The oil tanker cargo oil tank based on inert gas protection according to claim 1, characterized in that: The buffer pad (8) is fixedly connected to the lower end of the moving magnetic frame (7). The inner length of the fixed magnetic frame (5), the moving magnetic frame (7) and the buffer pad (8) are all greater than the length of the flat plate (6), and the inner width of the three is greater than the width of the flat plate (6). The inner length and inner width of the moving magnetic frame (7) are greater than the inner length and inner width of the buffer pad (8), respectively. The soft cloth (9) is located inside the buffer pad (8).

4. The oil tanker cargo oil tank based on inert gas protection according to claim 1, characterized in that: The upper end of the flat plate (6) is provided with a plurality of spiral grooves (601), and a plurality of soft cloths (9) correspond one-to-one with the plurality of spiral grooves (601), and the lower end of the soft cloths (9) is fixedly connected to the inner bottom surface of the spiral grooves (601).

5. The oil tanker cargo oil tank based on inert gas protection according to claim 1, characterized in that: The first magnetic ring (11) is located at the center of the moving magnetic frame (7) and directly below the hydraulic cylinder (3), and the inner diameter of the first magnetic ring (11) is larger than the outer diameter of the telescopic end of the hydraulic cylinder (3).

6. The oil tanker cargo oil tank based on inert gas protection according to claim 1, characterized in that: The pressure sensor (401) has a flexible sleeve (402) on the outside of its sensing end that is fixedly connected to the top frame (4), and the interior of the flexible sleeve (402) is filled with a soft layer (403).

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