Ship capable of natural seawater circulation

Abstract

The present invention relates to a ship that can allow ballast water to flow in according to the loading state of liquid cargo, thereby enabling the natural circulation of seawater. An embodiment of the present invention provides a ship that can enable the natural circulation of seawater. The ship that can enable the natural circulation of seawater includes: a cargo hold for loading liquid cargo; a ballast water storage tank configured in a multi-layer structure around the cargo hold for storing ballast water; a sea chest formed in the hull in such a way that seawater can flow in, including a seawater inlet; and a seawater inflow control device provided in the cargo hold and the ballast water storage tank, which controls the opening and closing of the seawater inlet according to the loading state of the liquid cargo, and allows seawater to flow into the ballast water storage tank or blocks the inflow of seawater according to the opening and closing of the seawater inlet.

Description

Technical Field

[0001] The present invention relates to a ship capable of natural circulation of seawater, and more particularly, to a ship capable of allowing ballast water to flow in according to the loading state of liquid cargo, thereby enabling natural circulation of seawater. Background Art

[0002] Generally, large ships are designed to carry very heavy cargo. Therefore, when such large ships carry cargo below the standard weight or are in a state of not carrying cargo, the depth (draft) submerged in the water surface becomes smaller. However, the reduction in draft makes the left - right balance state of the ship unstable and causes the propeller to be exposed above the water surface, thus hindering the stable and economic navigation of the ship.

[0003] For this reason, large ships are equipped with a ballast water treatment device so as to adjust the buoyancy of the ship according to the weight of the loaded cargo. The ballast water treatment device constantly maintains the draft of the large ship by allowing seawater (commonly referred to as ballast water) to flow into the ballast tanks inside the ship or discharging the seawater inside the ballast tanks to the outside.

[0004] Existing ballast water treatment devices have the inconvenience of requiring staff to continuously or periodically monitor conditions that change at any time, and there is also the following inconvenience, that is, whenever the working conditions of the staff are different, it is necessary to determine how much ballast water to supply to or discharge from the ballast tanks arranged in the ship according to the monitoring results, and separately adjust the pumps and valves connected to the ballast tanks.

[0005] Prior Art Documents

[0006] Patent Documents

[0007] Korean Patent No. 10 - 1036625. Summary of the Invention

[0008] Technical Problem

[0009] The technical problem to be solved by the present invention is to provide a ship capable of allowing ballast water to flow in according to the loading state of liquid cargo, thereby enabling natural circulation of seawater.

[0010] Furthermore, the technical problem to be solved by the present invention is to provide a ship capable of natural circulation of seawater, which can change the shape of a hollow heavy object or the length of a cylinder according to the loading state of liquid cargo to control the opening and closing timing of a seawater inlet.

[0011] Furthermore, the technical problem to be solved by the present invention is to provide a ship capable of natural circulation of seawater, which can form a cylinder housing in various forms to arrange seawater inflow control devices at multiple positions.

[0012] The technical problems to be solved by the present invention are not limited to the above-mentioned technical problems, and those of ordinary skill in the art can clearly understand other technical problems not mentioned through the following description.

[0013] Technical Solution

[0014] To solve the above technical problems, an embodiment of the present invention provides a ship capable of natural seawater circulation. The ship capable of natural seawater circulation includes: a cargo hold for loading liquid cargo; a ballast water storage tank configured in a multi-layer structure around the cargo hold for storing ballast water; a sea chest formed in the hull in a manner that allows seawater to flow in, including a seawater inlet; and a seawater inflow control device provided in the cargo hold and the ballast water storage tank, which controls the opening and closing of the seawater inlet according to the loading state of the liquid cargo, and allows seawater to flow into the ballast water storage tank or blocks the inflow of seawater according to the opening and closing of the seawater inlet.

[0015] In an embodiment of the present invention, the seawater inflow control device may include: a hollow weight configured in the cargo hold and floating according to the loading state of the liquid cargo; an opening and closing member configured in the sea chest for controlling the opening and closing of the seawater inlet; and a cylinder module connecting the hollow weight and the opening and closing member, and moving the opening and closing member according to the loading state of the liquid cargo.

[0016] In an embodiment of the present invention, the cylinder module may include: a piston and a double-acting piston rod for connecting the hollow weight and the opening and closing member; and a cylinder housing for receiving the piston therein.

[0017] In an embodiment of the present invention, the cylinder module may include: a first piston and a first piston rod coupled to the hollow weight; a second piston and a second piston rod coupled to the opening and closing member; and a cylinder housing for receiving the first piston and the second piston therein, and allowing a power transmission substance made of a compressible fluid or an incompressible fluid to be interposed in the space between the first piston and the second piston.

[0018] In an embodiment of the present invention, the cylinder housing may be in at least one of a linear shape, a curved shape, and a bent shape and connected to the cargo hold.

[0019] In an embodiment of the present invention, the sea chest is arranged on the side or bottom of the hull such that the opening direction of the seawater inlet faces sideways or upwards. In the cylinder module, at least one of the shape of the cylinder housing, the moving direction of the hollow weight, and the moving direction of the opening and closing member can be set so that the opening and closing member opens and closes the seawater inlet according to the opening direction of the seawater inlet.

[0020] In an embodiment of the present invention, the above-mentioned seawater inflow control device can change at least one of the shape of the above-mentioned hollow weight and the length of the above-mentioned cylinder module, and control the opening and closing timing of the above-mentioned seawater inlet according to the loading state of the above-mentioned liquid cargo.

[0021] In an embodiment of the present invention, in the above-mentioned seawater inflow control device, when the above-mentioned liquid cargo is loaded above the upper end of the above-mentioned hollow weight, the inflow of seawater can be blocked, and when the above-mentioned liquid cargo is unloaded below the lower end of the above-mentioned hollow weight, the seawater can start to flow in.

[0022] In an embodiment of the present invention, the above-mentioned ship may further include: a one-way pressure reducing check valve provided in the above-mentioned ballast water tank at a set position for discharging seawater to the outside of the ship; and at least one watertight side girder provided along the entire length of the above-mentioned ballast water tank.

[0023] Advantages of the Invention

[0024] According to an embodiment of the present invention, the present invention has the following advantages. Ballast water can flow in according to the loading state of the liquid cargo, so that seawater can circulate naturally. Therefore, the ship can sail at an appropriate draft state without continuous monitoring or control by the staff, and thus can maintain stable and economical navigation.

[0025] Moreover, according to an embodiment of the present invention, a ship capable of natural circulation of seawater can be provided, and the shape of the hollow weight or the length of the cylinder can be changed according to the loading state of the liquid cargo to control the opening and closing timing of the seawater inlet.

[0026] Moreover, according to an embodiment of the present invention, a ship capable of natural circulation of seawater can be provided, and the cylinder housing can be formed in various forms to arrange the seawater inflow control device at multiple positions.

[0027] The effects of the present invention are not limited to the above effects, and should be understood to include all effects that can be inferred from the structure of the present invention described in the detailed description or the scope of the invention claimed. Brief Description of the Drawings

[0028] Figure 1 A diagram showing the central cross-section of a ship capable of natural circulation of seawater according to an embodiment of the present invention.

[0029] Figure 2 A diagram showing the side view of a ship capable of natural circulation of seawater according to an embodiment of the present invention projected.

[0030] Figures 3 to 4 For showing Figure 1 A diagram showing the sectional structure of the seawater inflow control device in , part (a) shows the state of loading liquid cargo, and part (b) shows the empty tank state (ballast water loading state).

[0031] Figure 5 This is a diagram showing the piping together to illustrate the entire system in a ship capable of natural seawater circulation according to an embodiment of the present invention.

[0032] Figure 6 and Figure 7 This is a diagram showing an application example of changing the specifications of the seawater inflow control device according to the size of the ship.

[0033] Figures 8 to 11 This is a diagram showing an application example of a structural change for setting the seawater inflow control device according to an embodiment of the present invention at multiple positions. Detailed Description of the Invention

[0034] Hereinafter, the present invention will be described with reference to the accompanying drawings. However, the present invention can be embodied in various different forms, and thus is not limited to the embodiments described herein. Moreover, in the drawings, parts irrelevant to the description are omitted for clarity in explaining the present invention, and throughout the specification, the same reference numerals are assigned to similar parts.

[0035] Figure 1 This is a diagram showing the central cross-section of a ship capable of natural seawater circulation according to an embodiment of the present invention. Figure 2 This is a diagram showing the side view of a ship capable of natural seawater circulation according to an embodiment of the present invention projected. Figure 3 and Figure 4 This is a diagram showing Figure 1 the sectional structure of the seawater inflow control device in

[0036] Referring to Figures 1 to 4 , a ship 10 capable of natural seawater circulation according to an embodiment of the present invention may include: a cargo hold 100 for loading liquid cargo; a ballast water tank 200 configured in a multi-layer structure of upper and lower layers around the cargo hold 100 for storing ballast water; a sea chest 300 formed in the hull in such a way that seawater can flow in, including a seawater inlet 310; a seawater inflow control device 400 provided in the cargo hold 100 and the ballast water tank 200 to control the opening and closing of the seawater inlet 310 according to the loading state of the liquid cargo, and to allow seawater to flow into the ballast water tank 200 or block the inflow of seawater according to the opening and closing of the seawater inlet 310; a one-way pressure reducing check valve 500 provided in the ballast water tank 200 at a set position for discharging seawater to the outside of the ship; and at least one watertight side girder 600 provided along the entire length of the ballast water tank 200.

[0037] Among them, the seawater inflow control device 400 may include: a hollow weight 410 disposed in the cargo hold 100 and floating according to the loading state of the liquid cargo; an opening and closing member 440 disposed in the sea bottom valve box 300 for controlling the opening and closing of the seawater inlet 310; and a cylinder module 415 connecting the hollow weight 410 and the opening and closing member 440 and moving the opening and closing member 440 according to the loading state of the liquid cargo.

[0038] As Figure 3 In the first embodiment shown, the cylinder module 415 may include: a piston 420 for connecting the hollow weight 410 and the opening and closing member 440; and a cylinder housing 430 for housing the piston 420 therein. In this case, the piston 420 is connected to the hollow weight 410 and the opening and closing member 440 in an integratable manner and can be housed inside the cylinder housing 430. The piston 420 can move the opening and closing member 440 up and down by the floating (up and down movement) of the hollow weight 410 caused by the loading state of the liquid cargo.

[0039] And, as Figure 4 In the second embodiment shown, the cylinder module 415 may include: a first piston 422 and a first piston rod 422a coupled to the hollow weight 410; a second piston 424 and a second piston rod 424a coupled to the opening and closing member 440; and a cylinder housing 430 for housing the first piston 422 and the second piston 424 therein and allowing a power transmission substance 450 made of a compressible fluid such as air or an incompressible fluid such as hydraulic oil to be interposed in the space between the first piston 422 and the second piston 424. In this case, when the hollow weight 410 moves up and down according to the loading state of the liquid cargo, the first piston 422 can move the second piston 424 coupled to the opening and closing member 440 up and down by applying pressure to the space between the first piston 422 and the second piston 424 filled with the power transmission substance 450. As described above, in the second embodiment, when the power transmission substance 450 is placed inside the cylinder housing 430, leakage of the liquid cargo can be prevented.

[0040] Among them, the hollow weight 410 may have a set volume so as to generate buoyancy when loading the liquid cargo. And the hollow weight 410 may have a set weight so as to allow seawater to flow in even under the buoyancy generated by the second piston 424 combined with the opening and closing member 440 in the empty hold state and the seawater dynamic pressure occurring during ship navigation.

[0041] The opening and closing member 440 may include an elastic polymer material, for example, an elastomer, and can control the opening and closing of the seawater inlet 310 by moving up and down to block (water-tight) the inflow of seawater, or allow seawater to flow in (non-water-tight). For example, as Figure 3 in part (a) ofFigure 4 As shown in part (a), when loading liquid cargo into the cargo hold 100, the hollow heavy object 410 can generate buoyancy, which can cause the piston 420 and the opening / closing member 440 to rise upward. The opening / closing member 440 that has risen upward can come into contact with the sea bottom valve box 300 and block the inflow of seawater. In this case, the ballast water becomes sufficient due to the presence of the liquid cargo.

[0042] And, as Figure 3 shown in part (b) and Figure 4 part (b), when unloading the loaded liquid cargo, the hollow heavy object 410 can lose buoyancy and generate its own weight in the direction of gravity. The own weight can cause the piston 420 and the opening / closing member 440 to descend in the direction of gravity. The opening / closing member 440 that has descended in the direction of gravity is separated from the sea bottom valve box 300 and can allow seawater to flow in. The ballast water can be adjusted by the seawater that has flowed in.

[0043] And, the cylinder housing 430 can be in at least one of a linear shape, a curved shape, and a bent shape and can be connected to the cargo hold 100. The shape of the cylinder housing 430 will be described later with reference to Figures 8 to 11 the following text.

[0044] Figure 5 is a diagram showing piping together to illustrate the entire system in a ship capable of natural circulation of seawater according to an embodiment of the present invention.

[0045] Referring to Figure 5 , the process of natural circulation of seawater in a ship will be described. In the empty hold state, the natural inflow state of seawater, and the natural circulation state of seawater, first, ① in the empty hold state, the opening / closing member 440 and the sea bottom valve box 300 can be separated, and seawater flows in through the seawater inflow control device 400. The seawater can flow into the lower ballast water storage tank 200 until the weight of the ship is equal to the buoyancy (for example, Archimedes' law) or flow into the watertight side girder 600.

[0046] ② The seawater that has flowed into the lower ballast water storage tank 200 can move to the engine room 800 including a heat exchanger through the piping 700 and be used as miscellaneous water (for example, cooling water for heat exchange). Seawater outside the ship can flow into the lower ballast water storage tank 200 through the seawater inflow control device 400 in the same amount as the seawater that has moved to the engine room 800.

[0047] ③ The seawater that has passed through the engine room 800 can move to the upper ballast water storage tank 200 through the piping 700.

[0048] ④ When the seawater fills the upper ballast water storage tank 200 and reaches a set pressure, the one-way pressure reducing check valve 500 can be opened and the seawater can be discharged to the outside of the ship.

[0049] It can be carried out naturally, continuously, and continuously from ① to ④. However, when the seawater moves, pumping may be required according to the situation.

[0050] Next, in the cargo loading state and the seawater inflow blocking state, the opening and closing member 440 contacts the sea chest 300 to block the inflow of seawater, and the piping 700 from ① to ④ is also blocked (closed).

[0051] And, ⑤ seawater can flow in through the sea chest in the engine room and be used as miscellaneous water. ⑥ The seawater used as miscellaneous water can be discharged to the outside of the ship.

[0052] Figure 6 And Figure 7 As a diagram showing an application example of changing the specifications of the seawater inflow control device according to the size of the ship, when liquid cargo is loaded above the upper end (H) of the hollow weight 410, the seawater inflow control device 400 can block the inflow of seawater, and when the liquid cargo is unloaded below the lower end L of the hollow weight 410, seawater can start to flow in. That is, the seawater inflow control device 400 can change at least one of the shape of the hollow weight 410 and the length of the cylinder module 415, so as to control the opening and closing timing of the seawater inlet 310 according to the loading state of the liquid cargo.

[0053] Among them, Figure 6 It is an application example suitable for crude oil tankers or chemical tankers (PC, Product Carrier) below the Aframax class that frequently perform partial loading. Figure 7 It is an application example suitable for crude oil tankers above the Aframax class (Aframax type, Suez max tanker, VLCC class) that mainly sail in a fully loaded state or an empty tank state.

[0054] Figures 8 to 11 As a diagram showing an application example of the structural change for setting the seawater inflow control device of an embodiment of the present invention at multiple positions.

[0055] Referring to Figures 8 to 11 , as described in the above second embodiment, in order to be set at multiple positions, the seawater inflow control device 400 may include a cylinder housing 430 with a power transmission substance 450 placed inside.

[0056] Among them, the sea chest 300 can be arranged on the side or bottom of the hull so that the opening direction of the seawater inlet 310 faces sideways or upward.

[0057] And, in the cylinder module 415, at least one of the shape of the cylinder housing 430, the moving direction of the hollow weight 410, and the moving direction of the opening and closing member 440 can be set so that the opening and closing member 440 opens and closes the seawater inlet 310 according to the opening direction of the seawater inlet 310.

[0058] For example, as Figure 8 shown, when the cylinder housing 430 is disposed on a double bottom plate (inner bottom plate, outer bottom plate of the ship's bottom), the cylinder housing 430 can be formed in a straight shape, so that the vertical force generated by the hollow heavy object 410 moving up and down causes the opening and closing member 440 to move up and down. Therefore, both the hollow heavy object 410 and the opening and closing member 440 can move up and down.

[0059] And, as Figure 9 shown, when the cylinder housing 430 is disposed on the ship's side, the cylinder housing 430 can be formed in a curved shape, so that the hollow heavy object 410 moves up and down and the opening and closing member 440 moves left and right.

[0060] However, Figure 8 the M positions of the cylinder housing 430 of Figure 9 and the M positions of the cylinder housing 430 of Figure 10 and Figure 11 are of a welded structure. Therefore, there is a possibility of oil leakage due to welding joints (cracks, etc.). Therefore, as

[0061] shown in Figure 10 and Figure 11 and

[0062] In Figure 10 and

[0063] In Figure 11 and

[0064] According to an embodiment of the present invention, the present invention can provide a ship that allows ballast water to flow in according to the loading state of liquid cargo, thereby enabling natural circulation of seawater.

[0065] Moreover, according to an embodiment of the present invention, the present invention can provide a ship capable of natural circulation of seawater, and can change the shape of the hollow heavy object or the length of the cylinder according to the loading state of the liquid cargo to control the opening and closing timing of the seawater inlet.

[0066] Moreover, according to an embodiment of the present invention, the present invention can provide a ship capable of natural circulation of seawater, and can form the cylinder housing in various forms to set the seawater inflow control device at multiple positions.

[0067] The above description of the present invention is only for illustration, and those of ordinary skill in the technical field to which the present invention pertains can understand that the present invention can be easily deformed into other specific forms without changing the technical idea or essential features of the present invention. Therefore, it should be understood that the above-described multiple embodiments are illustrative in all aspects and not restrictive. For example, each structural element described as a single type can also be implemented dispersedly, and similarly, the structural elements described as dispersed types can also be implemented in a combined form.

[0068] The scope of the present invention should be represented by the scope of the claims described hereinafter, and all changes or deformed forms derived from the meaning, scope, and equivalent concepts of the scope of the claims should be included within the scope of the present invention.

[0069] Industrial Applicability

[0070] The ship of the present invention capable of natural circulation of seawater can allow the inflow of ballast water or block the ballast water according to the loading state of the liquid cargo, so that the ship can sail in an appropriate draft state without continuous monitoring or control by the staff, thereby maintaining stable and economical navigation. Therefore, the industrial applicability is very high.

Claims

1. A ship capable of natural seawater circulation, characterized in that, Comprising: A cargo hold (100) for loading liquid cargo; A ballast water storage tank (200) arranged in a multi-layer structure around the above-mentioned cargo hold (100) for storing ballast water; A sea chest (300) formed on the hull in a manner that allows seawater to flow in, including a seawater inlet (310); and A seawater inflow control device (400) arranged in the above-mentioned cargo hold (100) and the above-mentioned ballast water storage tank (200), controlling the opening and closing of the above-mentioned seawater inlet (310) according to the loading state of the above-mentioned liquid cargo, and allowing seawater to flow into the above-mentioned ballast water storage tank (200) or blocking the inflow of seawater according to the opening and closing of the above-mentioned seawater inlet (310), The above-mentioned seawater inflow control device (400) includes: A hollow weight (410) arranged in the above-mentioned cargo hold (100) and floating according to the loading state of the above-mentioned liquid cargo; An opening and closing component (440) arranged in the above-mentioned sea chest (300) for controlling the opening and closing of the above-mentioned seawater inlet (310); and A cylinder module (415) connecting the above-mentioned hollow weight (410) and the above-mentioned opening and closing component (440), moving the above-mentioned opening and closing component (440) according to the loading state of the above-mentioned liquid cargo.

2. The ship capable of enabling natural circulation of seawater according to claim 1, characterized in that, The above-mentioned cylinder module (415) includes: A piston (420) and a double-ended piston rod (420a) for connecting the above-mentioned hollow weight (410) and the above-mentioned opening and closing component (440); and A cylinder housing (430) accommodating the above-mentioned piston (420) inside.

3. The ship capable of enabling natural circulation of seawater according to claim 1, characterized in that, The above-mentioned cylinder module (415) includes: A first piston (422) and a first piston rod (422a) combined with the above-mentioned hollow weight (410); A second piston (424) and a second piston rod (424a) combined with the above-mentioned opening and closing component (440); and A cylinder housing (430) accommodating the above-mentioned first piston (422) and the above-mentioned second piston (424) inside, with a power transmission substance (450) made of a compressible fluid or an incompressible fluid intervening in the space between the above-mentioned first piston (422) and the above-mentioned second piston (424).

4. The ship capable of enabling natural circulation of seawater according to claim 3, characterized in that, The above-mentioned cylinder housing (430) is in at least one of a linear shape, a curved shape, and a bent shape, with one end connected to the cargo hold (100) and the other end connected to the ballast water storage tank (200).

Images