A fuel tank of a container ship and a fuel leakage detection device

Abstract

The present application discloses a fuel tank for a container ship and a fuel leakage detection device, relating to the technical field of fuel tanks. The present application includes: a tank body, which is composed of an inner shell, an intermediate layer and an outer shell; an isolation layer, which is arranged on the inner wall of the inner shell and is made of a corrosion-resistant elastic material, such as fluororubber, and its surface is coated with an anti-permeation coating, such as a polyurea coating; a protection structure, which is distributed on the top and side walls of the tank body and includes multiple groups of transverse reinforcing ribs and longitudinal support beams to form a grid-shaped compressive frame; it should be noted that the protection structure is constructed within the intermediate layer and is used to increase the overall compressive and impact resistance of the tank body, serving as the first layer of protection barrier for the fuel tank. The present application improves the impact resistance and heat insulation performance by setting a multi-layer composite tank body combined with a honeycomb structure, and realizes the dynamic sealing of the arc-shaped tank wall by using the movable structures of the sealing bottom plate and the sealing top plate, so as to achieve the isolation operation during fuel leakage and increase safety.

Description

Technical Field

[0001] This application relates to the technical field of fuel tanks, and particularly to a fuel tank for a container ship and a fuel leakage detection device. Background Art

[0002] With the continuous development of global trade, container ships, as an important tool for maritime transportation, have seen continuous growth in both demand and scale. To meet increasingly stringent environmental protection requirements and improve the economy of ships, the fuel tank technology of container ships has also been continuously developing and innovating.

[0003] In recent years, with the increasingly widespread application of new clean fuels such as methanol on ships, the requirements for fuel tanks have also changed. Methanol fuel has the characteristic of relatively high corrosiveness, so special treatments need to be carried out on the fuel tank, such as setting up isolation voids and using special paint.

[0004] However, the existing fuel tank structures still have some deficiencies in terms of safety. For example, the fuel tank has insufficient strength and cannot resist external damage. At the same time, it is difficult to detect fuel leakage in a timely manner, and there is no isolation function. When methanol leaks, it will quickly spread throughout the cabin, affecting the safety of the surrounding environment.

[0005] Therefore, this application proposes a fuel tank for a container ship and a fuel leakage detection device. Summary of the Invention

[0006] The purpose of this application is to provide a fuel tank for a container ship and a fuel leakage detection device to solve the problems in the above background art.

[0007] To achieve the above purpose, this application specifically adopts the following technical solutions:

[0008] A fuel tank for a container ship, comprising:

[0009] A tank body, which is composed of an inner shell, an intermediate layer, and an outer shell;

[0010] An isolation layer, which is arranged on the inner wall of the inner shell, is made of a corrosion-resistant elastic material, and its surface is coated with an anti-permeation coating;

[0011] A protection structure, which is distributed on the top and side walls of the tank body, includes multiple groups of transverse reinforcing ribs and longitudinal support beams, forming a grid-shaped compressive frame;

[0012] A bottom drainage groove, with a plurality of them extending longitudinally along the bottom of the tank body;

[0013] The fuel compartment frame comprises a rectangular steel frame fixedly mounted on the inner bottom of the inner shell, in which the fuel chamber is mounted, a curved tank wall is mounted on the rectangular steel frame, the rectangular steel frame divides the curved tank wall into an upper cavity, a middle cavity and a lower cavity, a plurality of sealed inspection doors connected to the middle cavity are arrayed on the curved tank wall, an air intake and water injection pipe connected to the upper cavity is mounted on the top of the curved tank wall, a sealed top plate movable up and down in the middle cavity is mounted on the top of the rectangular steel frame, and a sealed bottom plate movable up and down in the lower cavity is mounted on the bottom of the rectangular steel frame.

[0014] Furthermore, the middle layer is a honeycomb reinforcement structure filled with impact-resistant composite materials, and a temperature sensor is embedded in the honeycomb structure of the middle layer.

[0015] Furthermore, the rectangular steel frame includes a leaking bottom frame installed in the lower cavity, and a supporting frame is fixedly connected to the leaking bottom frame. The upper cavity is constructed between the top of the supporting frame and the arc-shaped tank wall, and both ends of the arc-shaped tank wall are constructed with sealing end plates for sealing the leaking bottom frame and the supporting frame at both ends of the length.

[0016] Furthermore, the leakage bottom frame includes a grille mesh plate whose bottom is fixedly connected to the bottom of the inner shell, and both sides of the grille mesh plate are constructed with inclined side panels arranged inclined upward, and a bearing mesh frame is fixedly connected between the upper ends of the two inclined side panels, and the bottom of the bearing mesh frame is constructed with multiple columns connected to the upper surface of the grille mesh plate, and the sealing bottom plate is slidably sleeved on the columns.

[0017] Furthermore, the sealing bottom plate includes a hollow frame that is slidably sleeved on the column, the length of the hollow frame has a gap between the two ends and the sealing end plates, the hollow frame is filled with insulation blocks, and the upper side of the hollow frame is configured with a plurality of sealing protrusions for sealing the mesh opening of the supporting mesh frame, and both side ends of the hollow frame are fixedly connected with trapezoidal blocks for resisting the oblique side plates.

[0018] Furthermore, the support frame includes a support vertical plate fixedly connected to the upper ends of two inclined side plates, the upper end of the support vertical plate is arrayed with a plurality of through openings arranged opposite to the sealed inspection door, the upper end of the support vertical plate abuts against the arc-shaped tank wall, a support top plate is connected between the tops of the two support vertical plates, a plurality of column tubes distributed on both sides of the upper surface of the support top plate are penetrated and connected between the support top plate and the bearing mesh frame, the top of the support top plate is constructed with two symmetrical and inclined guide slopes arranged downward toward the column tubes, a vent is constructed in the middle of the support top plate, a guide umbrella cover for covering the vent is installed on the support top plate, and the air suction and water injection pipes are arranged directly above the guide umbrella cover.

[0019] Further, the air suction and water injection pipeline includes a plurality of vertical pipes fixedly connected to the top of the arc-shaped tank wall. A confluence horizontal pipe is connected between the tops of the plurality of vertical pipes. An air extraction pipe and a water addition pipe are connected to the confluence horizontal pipe. The air extraction pipe is connected to a vacuum pump, and the water addition pipe is connected to a water extraction pump. Control valves are installed in both the air extraction pipe and the water addition pipe.

[0020] Further, on the opposite sides of the two support vertical plates, a limit horizontal bar located in the middle of the through hole is configured. The sealing top plate includes a horizontal frame slidably sleeved on the column pipe. The horizontal frame is filled with a lightweight block. The bottom of the horizontal frame abuts against the limit horizontal bar. A piston column block for blocking the ventilation hole is configured on the top of the horizontal frame.

[0021] A fuel leakage detection device for the above fuel tank includes:

[0022] A detection unit, including a directional diversion cavity configured in the bottom diversion groove. A diversion pipe that is inclined upward and connected to both sides of the arc-shaped tank wall is communicated in the directional diversion cavity. The end of the diversion pipe is communicated in the lower cavity of the arc-shaped tank wall and is located above the sealing bottom plate. A fuel detection pump is installed in the diversion pipe.

[0023] A diversion and collection member is installed in the diversion umbrella cover.

[0024] Further, the diversion umbrella cover includes a plurality of support rods arrayed along the circumferential side of the ventilation hole. The top of the support rod is fixedly connected with an arc-shaped cover plate. The edge of the arc-shaped cover plate is located outside the ventilation hole. The diversion and collection member includes a multi-stage filter screen filled in the arc-shaped cover plate and used for filtering fuel.

[0025] The beneficial effects of the present application are as follows:

[0026] In the present application, by setting the cabin body as a multi-layer composite structure and installing a honeycomb structure and a grid-shaped compression-resistant frame therein, the impact resistance and heat insulation performance of the cabin body can be greatly improved. At the same time, by setting a rectangular steel frame and an arc-shaped tank wall in the cabin body, the fuel chamber can be set therein and separated from the outside. The double-layer protection greatly improves the impact resistance and increases safety.

[0027] In the present application, by setting the arc-shaped tank wall, the fuel chamber can be separated from the cabin body. Under normal conditions, the sealing top plate and the sealing bottom plate move down, opening the connection between the upper cavity, the middle cavity, and the lower cavity, so that the arc-shaped tank wall is connected to the bottom diversion groove, forming a circulation structure, which is convenient for personnel to repair and operate. When fuel leakage occurs inside, the fuel leakage detection device can be used to quickly detect it, and then the gas in the arc-shaped tank wall can be quickly extracted through the air suction and water injection pipeline, reducing the air pressure therein. The sealing top plate and the sealing bottom plate move up in sequence, thereby isolating the middle cavity and avoiding fuel leakage to the outside and causing corrosion, further increasing safety. Description of the Drawings

[0028] Figure 1 is the three-dimensional structure diagram of the present application;

[0029] Figure 2 is the half-sectional three-dimensional structure diagram of the present application;

[0030] Figure 3 is the three-dimensional structure diagram of the cabin body of the present application;

[0031] Figure 4 is the three-dimensional structure diagram of the middle layer of the present application;

[0032] Figure 5 is the three-dimensional structure diagram of the arc-shaped tank wall of the present application;

[0033] Figure 6 is the half-sectional three-dimensional structure diagram of the fuel tank chamber frame of the present application;

[0034] Figure 7 is the partial three-dimensional structure diagram of the fuel tank chamber frame of the present application;

[0035] Figure 8 is the present application Figure 7 the half-sectional three-dimensional structure diagram in;

[0036] Figure 9 is the three-dimensional structure diagram of the rectangular steel frame of the present application;

[0037] Reference numerals: 1, cabin body; 101, inner shell; 102, middle layer; 103, outer shell; 2, isolation layer; 3, protective structure; 301, transverse reinforcing rib; 302, longitudinal support beam; 4, bottom flow guide groove; 5, fuel tank chamber frame; 501, upper cavity; 502, middle cavity; 503, lower cavity; 6, rectangular steel frame; 601, liquid leakage bottom frame; 6011, grid mesh plate; 6012, inclined side plate; 6013, load-bearing mesh frame; 6014, column; 602, support frame; 6021, support vertical plate; 60211, limit cross bar; 6022, through hole; 6023, support top plate; 6024, column pipe; 6025, flow guide inclined plane; 6026, ventilation hole; 7, arc-shaped tank wall; 701, sealed inspection door; 702, air intake and water injection pipeline; 7021, vertical pipe; 7022, confluence cross pipe; 7023, air extraction pipe; 7024, water addition pipe; 7025, control valve; 703, sealed end plate; 8, sealed top plate; 801, horizontal frame; 802, lightweight block; 803, piston column block; 9, sealed bottom plate; 901, hollow frame; 902, heat insulation block; 903, sealed convex block; 904, trapezoidal block; 10, flow guide umbrella cover; 1001, support rod; 1002, arc-shaped cover plate; 11, detection unit; 1101, directional flow guide cavity; 1102, flow guide pipe; 1103, fuel detection pump; 12, flow guide collection member; 1201, multi-stage filter screen. Detailed implementation manners

[0038] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application.

[0039] As Figures 1-7 shown, a fuel tank of a container ship proposed in an embodiment of the present application includes:

[0040] A tank body 1, which is composed of an inner shell 101, an intermediate layer 102 and an outer shell 103, and the inner shell 101 and the outer shell 103 are connected through the intermediate layer 102;

[0041] An isolation layer 2, which is arranged on the inner wall of the inner shell 101 and is made of a corrosion-resistant elastic material, such as fluororubber, and its surface is coated with an anti-permeation coating, such as a polyurea coating;

[0042] A protection structure 3, which is distributed on the top and side walls of the tank body 1 and includes multiple groups of transverse reinforcing ribs 301 and longitudinal support beams 302 to form a grid-shaped compression-resistant framework;

[0043] It should be noted that the protection structure 3 is constructed in the intermediate layer 102 to increase the overall compression and impact resistance of the tank body 1 and serve as the first protection barrier for the fuel tank;

[0044] A bottom flow guide groove 4, the number of which is multiple and extends longitudinally along the bottom of the tank body 1, and the bottom flow guide groove 4 is arranged at the inner bottom of the inner shell 101 and is mainly used for collecting cooling water flow;

[0045] A fuel tank chamber frame 5, which includes a rectangular steel frame 6 fixedly installed at the inner bottom of the inner shell 101. The rectangular steel frame 6 is arranged on the upper side of some of the bottom flow guide grooves 4 and is locally connected to the bottom flow guide groove 4. A fuel chamber is installed therein. An arc-shaped tank wall 7 is sleeved and installed on the rectangular steel frame 6. The rectangular steel frame 6 divides the inside of the arc-shaped tank wall 7 into an upper cavity 501, a middle cavity 502 and a lower cavity 503. A plurality of sealed maintenance doors 701 communicating with the middle cavity 502 are arrayed and installed on the arc-shaped tank wall 7. An air suction and water injection pipe 702 communicating with the upper cavity 501 is installed at the top of the arc-shaped tank wall 7. The arc-shaped tank wall 7 wraps the fuel chamber as a whole. When the sealed maintenance door 701 is closed, the arc-shaped tank wall 7 is only connected to the external tank body 1 through the bottom flow guide groove 4, and the air suction and water injection pipe 702 is used as a ventilation pipe. A sealed top plate 8 that moves up and down in the middle cavity 502 is installed at the inner top of the rectangular steel frame 6, and a sealed bottom plate 9 that moves up and down in the lower cavity 503 is installed at the inner bottom of the rectangular steel frame 6;

[0046] The overall structure is divided into two states. In one state, under normal conditions, the fuel chamber operates normally. The sealing top plate 8 and the sealing bottom plate 9 are both in the lower position. The upper cavity 501 and the middle cavity 502 are interconnected, and the middle cavity 502 and the lower cavity 503 are also interconnected. Therefore, the space inside the arc-shaped tank wall 7 is overall interconnected with the bottom diversion trough 4, which facilitates personnel to enter for maintenance operations on the fuel chamber. In this state, when the temperature in the fuel chamber is too high, water can also be injected into the upper cavity 501 and the lower cavity 503 through the air intake and water injection pipeline 702 for cooling, and then the water is discharged through the bottom diversion trough 4 to reduce the internal temperature, ensure the cooling effect, and ensure the safety of the fuel chamber. In the second state, it is the fuel leakage state. At this time, the sealing bottom plate 9 and the sealing top plate 8 move upward in sequence to seal between the lower cavity 503 and the middle cavity 502 respectively, and then seal between the middle cavity 502 and the upper cavity 501, so as to completely isolate the middle cavity 502 where the fuel chamber is located, prevent the fuel from continuing to leak and corrode the outside, and further increase safety.

[0047] As Figure 4 shown, in some embodiments, the intermediate layer 102 is a honeycomb-shaped reinforcement structure filled with anti-impact composite materials. A temperature sensor is embedded in the honeycomb structure of the intermediate layer 102. It should be noted that the intermediate layer 102 is mainly divided into two parts. One part is the upper and lower layers, that is, on the upper and lower sides of the inner shell 101, and the other part is the left and right layers, that is, on the horizontal sides of the inner shell 101. The honeycomb structures in the upper and lower layers are filled with a vertical cylindrical array, while the honeycomb structures in the left and right layers extend horizontally along the length direction of the cabin 1 and can be used as ventilation ducts. The temperature sensor is arranged in the vertical cylindrical honeycomb structure to continuously monitor the temperature change inside the cabin 1 and ensure safety.

[0048] As Figure 5 and Figure 9 shown, in some embodiments, the rectangular steel frame 6 includes a liquid leakage bottom frame 601 installed in the lower cavity 503. A support frame 602 is fixedly connected to the liquid leakage bottom frame 601. The upper cavity 501 is constructed between the top of the support frame 602 and the arc-shaped tank wall 7. Sealing end plates 703 for blocking the lengthwise ends of the liquid leakage bottom frame 601 and the support frame 602 are constructed at both ends of the arc-shaped tank wall 7. The liquid leakage bottom frame 601 is connected to the bottom diversion trough 4, and the support frame 602 is connected to the air intake and water injection pipeline 702. The air inside the arc-shaped tank wall 7 can be extracted by using the air intake and water injection pipeline 702, and the gas inside the cabin 1 will enter the arc-shaped tank wall 7 from the lower cavity 503 through the bottom diversion trough 4, so as to form a circulation and ensure the ventilation effect of the structure.

[0049] As Figures 8-9As shown, in some embodiments, the liquid leakage bottom frame 601 includes a grid mesh plate 6011 fixedly connected to the bottom inside the inner shell 101 at the bottom. Oblique side plates 6012 are constructed on both sides of the grid mesh plate 6011 and are inclined upward. A bearing mesh frame 6013 is fixedly connected between the upper ends of the two oblique side plates 6012. A plurality of upright columns 6014 connected to the upper surface of the grid mesh plate 6011 are constructed at the bottom of the bearing mesh frame 6013. The sealing bottom plate 9 is slidably sleeved on the upright columns 6014. The grid mesh plate 6011 is laid on the bottom inside the inner shell 101 and is located above a part of the bottom diversion groove 4, and can be communicated with the bottom diversion groove 4. It should be noted that the arc-shaped tank wall 7 is sleeved on the oblique side plate 6012. A lower cavity 503 is formed between the oblique side plate 6012 and the bearing mesh frame 6013. The fuel chamber equipment is all installed above the bearing mesh frame 6013, and the sealing bottom plate 9 is arranged below the bearing mesh frame 6013. When the sealing bottom plate 9 moves upward, it will block the bearing mesh frame 6013, so as to isolate the middle cavity 502 from the lower cavity 503, and thus block the communication with the bottom diversion groove 4 to avoid fuel leakage into the cabin 1 and increase safety.

[0050] As Figure 8 shown, in some embodiments, the sealing bottom plate 9 includes a hollow frame 901 slidably sleeved on the upright columns 6014. There are gaps between the two ends of the length direction of the hollow frame 901 and the sealing end plates 703. The arrangement of the upright columns 6014 can guide the up and down movement of the hollow frame 901. An insulating block 902 is filled in the hollow frame 901. The insulating block 902 is made of aerogel material, which has the characteristics of light weight and good heat insulation effect, and can make the hollow frame 901 have a floating function. A plurality of sealing protrusions 903 for sealing the mesh opening of the bearing mesh frame 6013 are constructed on the upper side of the hollow frame 901 to increase the contact area between the hollow frame 901 and the bearing mesh frame 6013 and improve the sealing performance. Trapezoidal blocks 904 for abutting against the oblique side plates 6012 are fixedly connected to both ends of the hollow frame 901. It should be noted that the space formed between the two oblique side plates 6012 is trapezoidal with a wider upper part and a narrower lower part. Under normal conditions, the hollow frame 901 will automatically fall to the opposite surfaces of the two oblique side plates 6012 under the action of gravity, and the trapezoidal blocks 904 are used to abut against the oblique side plates 6012 to limit the hollow frame 901, so that the hollow frame 901 is located in the middle of the oblique side plates 6012. At this time, the gaps between the two ends of the length direction of the hollow frame 901 and the sealing end plates 703 can be communicated with the space above the grid mesh plate 6011, so as to ensure the circulation of gas between the middle cavity 502 and the lower cavity 503. When the hollow frame 901 moves upward into the bearing mesh frame 6013, it will completely seal the bearing mesh frame 6013 to form an isolation effect.

[0051] As Figures 8-9As shown, in some embodiments, the support frame 602 includes a support vertical plate 6021 fixedly connected to the upper ends of the two oblique side plates 6012, and the support vertical plate 6021 forms a skeleton inside the curved tank wall 7 to support the inside of the curved tank wall 7. The support vertical plate 6021 is arrayed with a plurality of through openings 6022 arranged opposite to the sealed inspection door 701. When a person enters the curved tank wall 7 through the sealed inspection door 701, he needs to pass through the through openings 6022 to enter the fuel chamber. A transition space is formed between the support vertical plate 6021 and the curved tank wall 7 to prevent the person from directly contacting the fuel chamber, thereby increasing the safety of the person's operation after entering. The upper end of the support plate 6021 abuts against the arc tank wall 7, a support top plate 6023 is connected between the tops of the two support vertical plates 6021, a plurality of column tubes 6024 distributed on both sides of the upper surface of the support top plate 6023 are connected between the support top plate 6023 and the bearing net frame 6013, two symmetrical and inclined guide slopes 6025 are arranged downward toward the column tubes 6024, a vent hole 6026 is arranged in the middle of the support top plate 6023, a guide umbrella cover 10 for covering the vent hole 6026 is installed on the support top plate 6023, an air suction and water injection pipeline 702 is arranged just above the guide umbrella cover 10, and the support top plate 6023 is mainly used to separate the upper cavity 501 from the middle cavity 501. The air vent 6026 on the cavity 502 is used as a connecting part. When the gas in the curved tank wall 7 needs to circulate, the airflow in the cabin 1 passes through the bottom guide groove 4 and the grid mesh plate 6011 into the lower cavity 503, and then enters the middle cavity 502 through the gaps at both ends of the sealing bottom plate 9 and the bearing mesh frame 6013, and then enters the upper cavity 501 through the through-hole 6022 and the air vent 6026, and finally discharges the cabin 1 through the air suction and water injection pipe 702, so that the gas flows through the fuel chamber from the bottom, effectively cools the fuel chamber with air, and also ensures the ventilation effect and increases safety. When the temperature in the fuel chamber is too high, the air suction and water injection can be used. The pipe 702 closes the ventilation part and opens the water injection part, so that the water flows into the upper cavity 501, and is blocked by the guide umbrella cover 10 to avoid directly entering the vent 6026. The water flows through the guide slope 6025 to the column tube 6024, and flows directly into the lower cavity 503 along the column tube 6024, and finally flows out from the bottom guide groove 4. It can be connected to a pipe connected to the air intake and water injection pipe 702 through the bottom guide groove 4, or it can be directly discharged to the sea. The continuous circulation of water can make multiple column tubes 6024 quickly absorb the surrounding heat, thereby achieving a cooling effect. Compared with air cooling, water cooling has a higher cooling effect, which ensures the safety of the fuel chamber.

[0052] like Figure 5 and Figure 8As shown, in some embodiments, the air suction and water injection pipeline 702 includes a plurality of vertical pipes 7021 fixedly connected to the top of the arc-shaped tank wall 7. A confluence horizontal pipe 7022 is connected between the tops of the plurality of vertical pipes 7021. An air extraction pipe 7023 and a water addition pipe 7024 are connected to the confluence horizontal pipe 7022. The air extraction pipe 7023 is connected to a vacuum pump, and the water addition pipe 7024 is connected to a water extraction pump. Control valves 7025 are installed in both the air extraction pipe 7023 and the water addition pipe 7024. The confluence horizontal pipe 7022 is used to connect the plurality of vertical pipes 7021 together, so that the vertical pipes 7021 can be used as both air inlet ends and water outlet pipes. Only by using the control valves 7025 to control the opening and closing of the air extraction pipe 7023 and the water addition pipe 7024 can the switching between the two states be realized, increasing convenience. At the same time, using the vertical pipes 7021 as two-way interfaces can greatly reduce the space occupied by the pipeline and improve the space utilization rate.

[0053] As Figures 6-7As shown, in some embodiments, on the opposite sides of the two support vertical plates 6021, there is a limiting horizontal bar 60211 located in the middle of the through hole 6022. The sealing top plate 8 includes a horizontal frame 801 slidably sleeved on the column tube 6024. The horizontal frame 801 is filled with a lightweight block 802, which is also made of aerogel material, ensuring the overall lightweight structure of the horizontal frame 801. The bottom of the horizontal frame 801 abuts against the limiting horizontal bar 60211. A piston column block 803 for blocking the ventilation hole 6026 is constructed on the top of the horizontal frame 801. The limiting horizontal bar 60211 serves as a limiting structure for the horizontal frame 801. When the horizontal frame 801 is located on the limiting horizontal bar 60211, the horizontal frame 801 is in the middle position of the through hole 6022. Therefore, the through hole 6022 serves as the communication part between the upper cavity 501 and the middle cavity 502, facilitating the flow operation of the air flow. When the horizontal frame 801 moves upward, the piston column block 803 blocks the ventilation hole 6026, and cooperates with the sealing bottom plate 9 to block the bearing mesh frame 6013, realizing the isolation operation of the middle cavity 502. In addition, it should be noted that the sealing top plate 8 and the sealing bottom plate 9 respectively have two driving states. One is to install electric push rods on the sealing top plate 8 and the sealing bottom plate 9, and use electricity to drive them to move up and down to realize the isolation operation. The other is the non-powered state. In this state, no driving parts are provided on the sealing top plate 8 and the sealing bottom plate 9. The vacuum pump on the air extraction pipe 7023 quickly sucks the gas in the upper cavity 501, the middle cavity 502 and the lower cavity 503. Because the gap between the sealing bottom plate 9 and the sealing end plate 703 is much smaller than the gap between the through hole 6022 and the sealing top plate 8, and their weights are relatively light, with the decrease of air pressure, the sealing bottom plate 9 will move upward first, thus blocking the bearing mesh frame 6013. At this time, the air pressure in the middle cavity 502 decreases rapidly, and the sealing top plate 8 will also move upward until it seals the support top plate 6023. At this time, the middle cavity 502 will be in a negative pressure isolation state. On the one hand, it can isolate the leakage of fuel, and on the other hand, it can use the low-oxygen environment to reduce the risk of accidental fuel combustion and increase safety.

[0054] As Figure 6 and Figure 8 shown, a fuel leakage detection device for the above fuel tank proposed in an embodiment of the present application includes:

[0055] The detection unit 11 includes a directional guide cavity 1101 constructed in the bottom guide groove 4, the directional guide cavity 1101 is connected with a guide pipe 1102 which is inclined upward and connected with both sides of the arc tank wall 7, the end of the guide pipe 1102 is connected with the lower cavity 503 of the arc tank wall 7 and is located on the upper side of the sealing bottom plate 9, and a fuel detection pump 1103 is installed in the guide pipe 1102. The guide pipe 1102 is arranged on the upper side of the sealing bottom plate 9 in the lower cavity 503, so that the sealing bottom plate 9 can receive the leaked fuel, and then guide it into the guide pipe 1102, and finally into the directional guide cavity 1101, which is isolated from the rest of the bottom guide grooves 4, and the liquid fuel is collected separately to prevent the liquid fuel from leaking to the outside, thereby increasing safety;

[0056] The guide collection member 12 is installed in the guide umbrella cover 10. The guide umbrella cover 10 can be used to collect fuel carried in the ventilation airflow, reduce the probability of fuel entering the air intake and water injection pipe 702, avoid corrosion of the fuel, increase safety, and at the same time, an air detection device can be installed therein to increase detection accuracy.

[0057] like Figure 6 and Figure 8 As shown, in some embodiments, the guide umbrella cover 10 includes a plurality of support rods 1001 distributed in an array along the circumferential side of the vent 6026, and an arc-shaped cover plate 1002 is fixedly connected to the top of the support rod 1001, and the edge of the arc-shaped cover plate 1002 is located outside the vent 6026. The guide collection piece 12 includes a multi-stage filter 1201 filled in the arc-shaped cover plate 1002 and used to filter the fuel. The ventilation airflow will first hit the inner arc surface of the arc-shaped cover plate 1002 through the vent 6026, and then the multi-stage filter 1201 will be used to filter the gas to separate the fuel carried therein, and then gradually gather and drip onto the upper surface of the support top plate 6023 through the edge of the inner arc surface, and then flow into the column tube 6024, and finally guide to the guide tube 1102 through the sealing bottom plate 9, and finally gather into the directional guide cavity 1101 to avoid leakage to the outside and increase safety.

[0058] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A container ship fuel tank, characterized in that: include: The cabin is composed of an inner shell, an intermediate layer and an outer shell; The isolation layer is arranged on the inner wall of the inner shell and is made of corrosion-resistant elastic material and coated with an anti-permeability coating; The protective structure is distributed on the top and side walls of the cabin, including multiple sets of transverse stiffeners and longitudinal support beams to form a grid-like compression-resistant frame; Bottom guide grooves, which are in multiple numbers and extend longitudinally along the bottom of the cabin; The fuel compartment frame comprises a rectangular steel frame fixedly mounted on the bottom of the inner shell, in which the fuel chamber is mounted, a curved tank wall is sleeved and mounted on the rectangular steel frame, the rectangular steel frame divides the curved tank wall into an upper cavity, a middle cavity and a lower cavity, a plurality of sealed inspection doors connected to the middle cavity are arrayed on the curved tank wall, an air intake and water injection pipeline connected to the upper cavity is mounted on the top of the curved tank wall, a sealed top plate movable up and down in the middle cavity is mounted on the top of the rectangular steel frame, and a sealed bottom plate movable up and down in the lower cavity is mounted on the bottom of the rectangular steel frame; The rectangular steel frame includes a leaking bottom frame installed in the lower cavity, a supporting frame is fixedly connected to the leaking bottom frame, the upper cavity is constructed between the top of the supporting frame and the arc-shaped tank wall, and both ends of the arc-shaped tank wall are constructed with sealing end plates for sealing the leaking bottom frame and the supporting frame at both ends of the length; The leakage bottom frame comprises a grille mesh plate whose bottom is fixedly connected to the bottom of the inner shell, and both sides of the grille mesh plate are configured with oblique side plates arranged obliquely upward, and a bearing mesh frame is fixedly connected between the upper ends of the two oblique side plates, and the bottom of the bearing mesh frame is configured with a plurality of columns connected to the upper surface of the grille mesh plate, and the sealing bottom plate is slidably sleeved on the columns; The sealing bottom plate comprises a hollow frame slidably sleeved on the column, the hollow frame has a gap between the two ends and the sealing end plates, the hollow frame is filled with heat insulation blocks, the upper side of the hollow frame is configured with a plurality of sealing protrusions for sealing the mesh opening of the bearing mesh frame, and both side ends of the hollow frame are fixedly connected with trapezoidal blocks for contacting the oblique side plates; The support frame comprises a support vertical plate fixedly connected to the upper ends of two oblique side plates, the support vertical plate is arrayed with a plurality of through openings arranged opposite to the sealed inspection door, the upper ends of the support vertical plates are in contact with the arc-shaped tank wall, a support top plate is connected between the tops of the two support vertical plates, a plurality of column tubes distributed on both sides of the upper surface of the support top plate are penetrated and connected between the support top plate and the bearing net frame, the top of the support top plate is configured with two symmetrical and inclined guide slopes arranged downward toward the column tubes, a vent hole is configured in the middle of the support top plate, a guide umbrella cover for covering the vent hole is installed on the support top plate, and the air suction and water injection pipeline is arranged directly above the guide umbrella cover; The opposite sides of the two supporting vertical plates are constructed with limiting horizontal bars located in the middle of the through-hole, and the sealing top plate includes a horizontal frame slidably sleeved on the column tube, the horizontal frame is filled with lightweight blocks, the bottom of the horizontal frame is in contact with the limiting horizontal bar, and the top of the horizontal frame is constructed with a piston column block for sealing the vent hole.

2. A container ship fuel tank according to claim 1, characterized in that: The middle layer is a honeycomb reinforcement structure filled with impact-resistant composite materials, and a temperature sensor is embedded in the honeycomb structure of the middle layer.

3. A container ship fuel tank according to claim 1, characterized in that: The air suction and water injection pipeline includes a plurality of vertical pipes fixedly connected to the top of the arc-shaped tank wall, a converging cross pipe is connected between the tops of the plurality of vertical pipes, an air extraction pipe and a water adding pipe are connected to the converging cross pipe, the air extraction pipe is connected to the vacuum pump, the water adding pipe is connected to the water pump, and control valves are installed in the air extraction pipe and the water adding pipe.

4. A fuel leakage detection device for a fuel tank as claimed in any one of claims 1 to 3, characterized in that: include: The detection unit comprises a directional flow guiding cavity constructed in the bottom flow guiding groove, wherein the directional flow guiding cavity is connected with a flow guiding pipe which is inclined upward and connected with two sides of the arc-shaped tank wall, wherein the end of the flow guiding pipe is connected with the lower cavity of the arc-shaped tank wall and is located on the upper side of the sealing bottom plate, and a fuel detection pump is installed in the flow guiding pipe; The diversion collecting component is installed in the diversion umbrella cover.

5. A fuel leak detection device according to claim 4, characterized in that: The guide umbrella cover includes a plurality of support rods distributed in an array along the circumferential side of the vent hole, the top of the support rods is fixedly connected with an arc-shaped cover plate, the edge of the arc-shaped cover plate is located outside the vent hole, and the guide collection piece includes a multi-stage filter screen filled in the arc-shaped cover plate and used for filtering fuel.

Images