KR20210035329A - Ship - Google Patents

Abstract

This ship includes the hull 10, the bridge disposed on the stern side of the hull 10, the main 40 provided in the hull 10, and the upper deck 13 of the hull 10. A fuel tank 50 having an outer circumferential surface extending along an axis O that is provided on the fore side of the bridge and inclined downward as it faces the fore side, and the fuel of the cycle is stored, and the fuel tank 50 A suction port is disposed at a portion on the bow side, and a pump 70 is provided for inhaling fuel.

Description

Ship{SHIP}

The present invention relates to a ship. This application claims priority based on patent application 2017-076856 for which it applied to Japan on April 7, 2017, and uses the content here.

As a carrier ship as a kind of ship, a carrier ship in which a plurality of cargo tanks for storing liquefied gas such as LNG are arranged in the fore and aft direction is known (see, for example, Patent Documents 1 and 2). These plurality of cargo tanks are spherical tanks that have a spherical shape. The spherical tank is provided so that the upper half protrudes from the upper deck from the bow side rather than the bridge provided on the stern side of the ship.

In the carrier ships of Patent Documents 1 and 2, the height of the spherical tanks arranged on the fore and aft of the plurality of spherical tanks arranged in the fore and aft direction is arranged on the stern side so as to ensure a view from the bridge to the water surface in front A configuration that is smaller than the old tank is disclosed.

Japanese Laid-Open Patent Publication No. Hei 9-24891 Japanese Patent Laid-Open Publication No. 61-241293

In the above-described transport ship, the liquefied gas of the cargo tank as a cargo may be used as it is as fuel for the main machine of the ship. However, there is a case where a fuel tank for storing fuel is installed separately from a cargo tank for storing liquefied gas due to a request to separate cargo and fuel.

It is desirable to increase the volume of such a fuel tank as much as possible in order to secure the cruising distance of the ship. In addition, since it is necessary to install the fuel tank in a limited space in the ship, there are restrictions on the installation position of the fuel tank and the size of the fuel tank.

In particular, depending on the installation location of the fuel tank, there is a possibility that the view from the bridge to the water surface may be obstructed. On the other hand, in order to properly suck out the fuel in the fuel tank by the pump, it is necessary to pay attention to the attitude of the fuel tank in order to secure the liquid level of the fuel at the pump installation position in the fuel tank.

The present invention provides a ship capable of securing the size of a fuel tank and fuel absorption while securing a view from a bridge.

According to a first aspect of the present invention, a ship is provided with a hull, a bridge disposed above the stern side of the hull, a cycle provided in the hull, and a bow side of the bridge on the upper deck of the hull. , A fuel tank having an outer circumferential surface extending along an axis that is inclined downward as the fuel of the cycle is stored, and a suction port is disposed at a portion of the bow side in the fuel tank to suck the fuel. It is equipped with a pump.

According to the ship of the above aspect, the outer circumferential surface of the fuel tank installed on the upper deck extends along an axis inclined downward toward the bow. For this reason, it is possible to increase the volume of the fuel tank within a range in which the visibility can be secured while securing a view from the bridge to the front of the bow.

In addition, since the pump sucks fuel from the portion on the bow side of the fuel tank that becomes the lower part of the slope of the fuel tank, even when the fuel in the fuel tank is relatively low, the head of the pump during suction can be secured. have. For this reason, it is possible to reduce the amount of remaining fuel in the fuel tank due to not being used up to the end.

According to the second aspect of the present invention, it is preferable that the upper tank line and the lower tank line constituting the outer circumferential surface of the fuel tank are respectively parallel to the axis as viewed in the line width direction.

Since the upper tank line is inclined downward toward the bow side, it is possible to avoid obstructing the view from the bridge to the forward side of the bow. Further, since the lower tank line is inclined downward toward the bow side, when the fuel in the fuel tank is low, fuel is collected in the front of the fuel tank. For this reason, the fuel collected in the front can be sucked out by the pump provided on the bow side in the fuel tank.

According to a third aspect of the present invention, the upper tank line extends along a view request line connecting the bridge and the water surface in front of the athlete, as viewed from a line width direction.

Thereby, the volume of the fuel tank can be secured to the maximum within a range in which the fuel tank does not obstruct the view from the bridge to the front of the bow, that is, does not violate the rules regarding the view of the ship.

According to the fourth aspect of the present invention, it is preferable that the outer circumferential surface of the fuel tank is formed in the shape of a cylindrical surface centered on the axis line.

Thereby, the cost in manufacturing a fuel tank can be suppressed. In addition, a pressure-resistant structure for storing fuel in a high-pressure state can be manufactured at low cost.

According to a fifth aspect of the present invention, a cargo hold is formed in the hull, and a cargo tank is disposed in the cargo hold to receive liquefied gas.

Even if a cargo tank for storing liquefied gas and a fuel tank for storing fuel are separately provided, as described above, while securing the maximum volume of the fuel tank, visibility from the bridge and the consumption of fuel in the fuel tank can be ensured. I can.

According to the above vessel, it is possible to secure the size of the fuel tank and the absorption of fuel while securing a view from the bridge.

1 is a side view of a carrier ship according to an embodiment.
2 is an enlarged view of a main part of FIG. 1.
3 is a cross-sectional view orthogonal to the axis of the fuel tank of the carrier ship according to the embodiment.
Fig. 4 is a diagram for explaining a field of view request line.
5A is a cross-sectional view orthogonal to the axis of the fuel tank showing a first modification of the fuel tank of the carrier ship.
Fig. 5B is a cross-sectional view orthogonal to the axis of the fuel tank showing a second modified example of the fuel tank of the carrier ship.
5C is a cross-sectional view orthogonal to the axis of the fuel tank showing a third modified example of the fuel tank of the carrier ship.

Hereinafter, a ship 100 according to a first embodiment of the present invention will be described in detail with reference to the drawings. The ship 100 of this embodiment is a liquefied gas carrier which transports liquefied petroleum gas (LPG) as a liquefied gas.

As shown in FIG. 1, the ship 100 is equipped with the hull 10, the bridge 20, the cargo tank 30, the main body 40, the fuel tank 50, and the pump 70.

The hull 10 has a bowstring 11, a ship bottom 12, and an upper deck 13. The bowstring 11 is constituted by a pair of bowstring shell plates constituting the left and right bowstrings 11, respectively. The ship bottom 12 is comprised of the ship bottom shell plate which connects these left and right side sides 11 to each other from the bottom.

The upper deck 13 connects a pair of left and right side sides 11 from the upper side of the ship bottom 12. The upper deck 13 is an exposure deck extending from the bow to the stern. The upper deck 13 extends in the horizontal direction. As for the upper deck 13, the stern side of the ship 100 may be lowered depending on the navigation state of the ship 100, so that the upper deck 13 itself may also have a stern side inclined downward.

The hull 10 is formed in a substantially box-shaped cross-sectional shape orthogonal to the fore and aft direction by the side 11, the bottom 12 and the upper deck 13 to form a space therein. A portion of the ship body 10 on the stern side is an engine room 14. A portion of the ship body 10 on the bow side of the engine room 14 is a cargo hold 15 partitioned by the engine room 14 and the bulkhead.

The bridge 20 is provided so as to extend upward from the top of the hull 10. The bridge 20 is provided on the stern side in the upper part of the hull 10 and is provided above the engine room 14. The bridge 20 constitutes a plurality of hierarchies. A cockpit 21 for manipulating the ship 100 is provided on the upper floor of the bridge 20. The cockpit 21 is configured so that the front of the ship 100 can be viewed from a high place.

The cargo tank 30 is provided so that a plurality (three in this embodiment) are arranged in the fore and aft direction in the cargo hold 15 of the hull 10. In the portion between the adjacent cargo tanks 30, a partition wall is provided that divides a division in which each cargo tank 30 is accommodated.

이하로 함으로써, 상압에서 액화된다. 이로 인하여, 선박(100)에는, LPG를 저온 액화 상태로 유지하기 위한 도시하지 않은 증발 가스 처리 장치가 마련되어 있다. 증발 가스 처리 장치로서는, 재액화 장치가 채용되고 있다.The cargo tank 30 of this embodiment is a square tank constructed by bonding flat tank wall parts to each other. In the cargo tank 30, LPG as a cargo is stored in a low-temperature state at normal pressure. In addition, the "normal pressure low temperature state" means a state in which the LPG liquefied state is maintained simply by lowering the LPG without pressurizing it. LPG, about -46

By setting it as the following, it is liquefied at normal pressure. For this reason, the ship 100 is provided with an evaporative gas treatment device (not shown) for maintaining the LPG in a low-temperature liquefied state. As an evaporative gas treatment device, a reliquefaction device is employed.

이하의 온도)가 유지되고 있다.The reliquefaction apparatus cools the vaporized gas discharged by vaporizing LPG in the cargo tank 30 by external heat and liquefies it again by cooling it outside the cargo tank 30. The gas liquefied in this way is returned to the cargo tank 30 as LPG. Thereby, a low-temperature liquefied state in LPG (e.g. -46

The following temperature) is maintained.

The main body 40 is arranged in the engine room 14 in the hull 10. The cycle 40 of this embodiment is driven by LPG as fuel. Here, the fuel of the cycle 40 is not limited to LPG, and may be used in combination (bifuel) or mixed (dual fuel) with LPG and other fuels. By the drive of the cycle 40, the screw 41 provided below the stern of the hull 10 rotates.

Next, the fuel tank 50 will be described with reference to FIG. 2. The fuel tank 50 of the present embodiment stores LPG used as fuel for the cycle 40. The fuel tank 50 is provided on the upper deck 13. In this embodiment, it is provided on the upper deck 13 above the cargo tank 30 in the center among the cargo tanks 30 arranged in the fore and aft direction, for example.

The fuel tank 50 is capable of storing LPG at high pressure and room temperature. For this reason, the fuel tank 50 is constituted by a pressure-resistant container. In addition, the "high pressure room temperature state" means a state in which the LPG liquefied state is maintained only by pressurizing the LPG without cooling it.

The fuel tank 50 has a cylinder portion 51 and a pair of lid portions 52. The cylindrical portion 51 has a cylindrical shape centered on the axis O. In this embodiment, as shown in FIG. 3, the cross-sectional shape orthogonal to the axis line O of the cylinder portion 51 has a circular shape, that is, the cylinder portion 51 has a cylindrical shape. The thickness of the wall constituting the cylindrical portion 51 is constant. The dimension of the cylinder portion 51 in the axial line O direction is larger than the diameter of the cylinder portion 51. That is, the fuel tank 50 has the axis line O direction as the longitudinal direction.

The pair of lid portions 52 are provided so as to close both ends of the cylinder portion 51 in the axial line (O) direction, respectively. For example, the cylindrical portion 51 has a curved shape protruding outward from both ends of the cylindrical portion 51, and preferably has a spherical shape. In this way, the fuel tank 50 is constituted by the cylindrical portion 51 and the pair of cover portions 52 forming a curved surface, thereby securing pressure resistance by forming a cylindrical shape as a whole. The outer circumferential surface centered on the axis of the fuel tank 50 also forms a cylindrical surface. The volume of the fuel tank 50 is sufficiently smaller than the volume of the cargo tank 30.

Such a fuel tank 50 is provided on the upper deck 13 so as to incline downward as the axis O is directed toward the bow. That is, the fuel tank 50 extends along an axis O that faces downward as it faces the bow. The axis line O coincides with the fore and aft direction when viewed from the plane of the ship 100. A pair of fuel tanks 50 may be arranged so that the axes O are parallel to each other when viewed in a plan view by being spaced apart in the line width direction.

The axis O disposed above the upper deck 13 is inclined with respect to the upper deck 13 so as to approach the upper deck 13 as it faces the bow. The angle of inclination of the axis O with respect to the upper deck 13 is, even if the stern side of the vessel 100 and the upper deck 13 is descending during the navigation of the vessel 100, the axis O is on the horizontal plane. On the other hand, as it faces toward the player, it is such that it can maintain its inclined downwards.

As shown in Fig. 2, a line connecting the upper ends of the outer circumferential surfaces of the cylinder portions 51 of the fuel tanks 50 at positions in the fore and aft directions is taken as the upper tank line La. The upper tank line La forms an upper contour when viewed from the side of the ship 100. A line connecting the lower ends of the outer circumferential surface of the cylinder portion 51 of the fuel tank 50 at each fore and aft position is referred to as the lower tank line Lb. The lower tank line Lb forms a lower outline when viewed from the side of the ship 100.

These upper tank lines La and lower tank lines Lb are inclined downward as they face the bow. In this embodiment, the upper tank line La and the lower tank line Lb are parallel to the axis line O. Since the thickness of the cylinder portion 51 constituting the fuel tank 50 is constant, the lower tank line Lb is inclined, so that the bottom surface dividing the space in the fuel tank 50 is also the lower tank line Lb. It is inclined in the same way as.

As an example, the inclined posture of the fuel tank 50 as described above is made by the tank support part 60 supporting the inclined tank. The tank support part 60 supports the fuel tank 50 on the upper deck 13 so that the axis O of the fuel tank 50 is inclined as described above. For example, in this embodiment, the fuel tank 50 is supported by the upper end of the bow side support part 61 and the stern side support part 62. The fore-side support 61 and the stern-side support 62 are each fixed on the upper deck 13, and the upper end of the stern-side support 62 is located above the upper end of the fore-side support 61. In this way, the inclined posture of the fuel tank 50 is maintained according to the difference in height between the stern side support portion 62 and the bow side support portion 61. In addition, the configuration of the tank support part 60 is not limited to the above configuration, and other configurations may be employed as long as the fuel tank 50 can be supported on the upper deck 13 in an inclined position.

Here, with reference to FIG. 4, the inclined attitude of the fuel tank 50 will be described in more detail. The fuel tank 50 is disposed on the upper deck 13 so as to enter below the view request line Lv shown in FIG. 4. Here, the field of view request line (Lv) is twice the total length Loa of the ship 100 from the cockpit 21 in the bridge 20 and the bow on the water surface in front of the bow or 500 m, whichever is shorter. It is an imaginary line connecting positions.

That is, in the ship 100, according to the rule, structures such as the fuel tank 50 on the upper deck 13 are twice the total length from the cockpit 21 of the bridge 20 or 500 m from the bow on the water surface in front of the bow. It is established as a requirement not to obstruct the view to the position of the shorter one. More specifically, the base end of the view request line Lv on the bridge 20 side is at a position of 750 mm toward the stern side from the front wall surface in front of the cockpit 21, and 1800 mm from the floor surface. It is set by location. When the fuel tank 50 is disposed below the field of view request line Lv, that is, when the upper tank line La of the fuel tank 50 is not positioned above the field of view request line Lv, the Satisfy the demands of the rules.

In order to increase the volume of the fuel tank 50 as much as possible, the upper tank line La of the fuel tank 50 is preferably arranged as close as possible to the field of view request line Lv. The upper tank line La of the fuel tank 50 may be parallel to the field of view request line Lv. The upper tank line La of the fuel tank 50 may extend in line with the visual field request line Lv. That is, the upper tank line La of the fuel tank 50 just needs to extend along the view request line Lv.

Next, the pump 70 will be described. The pump 70 has a role of pumping LPG in the fuel tank 50 to the cycle 40 as shown in FIG. 2. A drive unit such as an electric motor for driving the pump 70 may be provided in the fuel tank 50 or may be provided outside the fuel tank 50. In particular, since the LPG stored in the fuel tank 50 has insulating properties, there is no problem even if a driving unit is provided in the fuel tank 50.

The pump 70 has its suction port provided in a portion of the fuel tank 50 on the bow side. In particular, in this embodiment, the intake port of the pump 70 is disposed in the vicinity of the boundary between the cylinder portion 51 in the space within the fuel tank 50 and the lid portion 52 on the bow side. It is preferable that the intake port of the pump 70 is provided at a location located at the lowest position in the space within the fuel tank 50 or in close proximity to the above location. It is preferable that the intake port of the pump 70 is provided corresponding to a location where the lower tank line Lb of the fuel tank 50 is located at the lowest position. The fuel sucked out from the pump 70 is transferred to the main cycle 40 through a pipe 71.

Next, the operation of the present embodiment will be described.

In this embodiment, the outer circumferential surface of the fuel tank 50 provided on the upper deck 13 extends along the axis O inclined downward toward the bow. Accordingly, while ensuring a large view from the cockpit 21 of the bridge 20 to the front of the player, the volume of the fuel tank 50 can be increased within a range that can ensure the above view.

That is, when the fuel tank 50 is inclined toward the bow, it is possible to suppress obstruction of the view from the cockpit 21 of the bridge 20 toward the water surface toward the bow. In addition, since the stern side of the fuel tank 50 is positioned upward due to the inclined posture, the fuel tank 50 occupies a space that has not been used so far and does not obstruct the view. For this reason, the effective volume in which the fuel tank 50 can store fuel can be expanded.

In addition, since the pump 70 is configured to suck fuel from the portion on the bow side of the fuel tank 50 that becomes the lower slope of the fuel tank 50, when the fuel in the fuel tank 50 is relatively small Also, it is possible to secure the head of the pump 70 during suction. That is, as shown in FIG. 2, when the remaining amount of LPG in the fuel tank 50 becomes small, the LPG is collected on the bow side of the fuel tank 50 according to the inclination of the fuel tank 50. When the LPG collected in this way is sucked out by the pump 70 through the suction port, it is possible to reduce the remaining fuel in the fuel tank 50 due to not being used up to the end. That is, it is possible to ensure the fuel absorption by the pump 70.

Here, if the inclined posture of the fuel tank 50 is opposite to the present embodiment, that is, when the axis O of the fuel tank 50 is inclined downward toward the stern side, the fuel tank ( 50) will be positioned on the upper side. In this case, there is a possibility that the view of the bridge 20 from the cockpit 21 may be obstructed. In addition, in order to secure a view, the fuel tank 50 must be installed on the stern side, and the degree of freedom of installation is impaired. Further, if the fuel tank 50 is installed on the bow side so as not to obstruct the view from the bridge 20, the fuel tank 50 itself needs to be made small, and the effective volume is reduced.

On the other hand, if the fuel tank 50 is disposed so that the axis O of the fuel tank 50 extends downward as it faces toward the bow as in the present embodiment, the fuel tank 50 is within a range that does not obstruct the view. It can be disposed on the front side of the upper deck 13, that is, it is possible to improve the degree of freedom in the arrangement of the fuel tank 50 on the deck. In addition, the volume of the fuel tank 50 can be maximized within a range that does not obstruct the view from the bridge 20.

In particular, in this embodiment, the upper tank line La and the lower tank line Lb of the fuel tank 50 are parallel to the inclined axis O. That is, since the upper tank line La is inclined downward toward the bow, it is possible to further avoid obstructing the view from the bridge 20 to the forward of the bow. Further, since the lower tank line Lb is inclined downward toward the bow, the bottom surface constituting the space inside the fuel tank 50 is also inclined in the same manner. Accordingly, when the LPG in the fuel tank 50 is low, the fuel in the fuel tank 50 is guided to the bow side by the bottom surface, so that LPG can be collected in a portion of the bow side in the fuel tank 50. . For this reason, the fuel collected in the front can be sucked out with high efficiency by the pump 70 provided on the bow side in the fuel tank 50.

In addition, since the upper tank line La extends along the line of sight requirement Lv connecting the bridge 20 and the water surface in front of the bow, as viewed from the line width direction, while meeting the required rules, the fuel tank 50 In a range in which) does not obstruct the view from the bridge 20 to the front of the bow, the volume of the fuel tank 50 can be secured to the maximum.

Moreover, when the fuel tank 50 has a cylindrical shape, the manufacturing cost of the fuel tank 50 can be suppressed. In addition, a pressure-resistant structure for storing fuel in a high-pressure state can be manufactured at low cost.

And, as in the present embodiment, even when the cargo tank 30 for storing LPG as cargo and the fuel tank 50 for storing LPG as fuel are separately provided, as described above, the volume of the fuel tank 50 The visibility from the bridge 20 and the absorption of fuel in the fuel tank 50 can be ensured while securing to the maximum.

As mentioned above, although the embodiment of this invention was demonstrated, this invention is not limited to this, and can be changed suitably within the range which does not deviate from the technical idea of the invention.

For example, as the first modification, the fuel tank 150 shown in Fig. 5A may be employed. In the fuel tank 150 of the first modification, two cylindrical portions 151 each extending in the axial line O direction are arranged in parallel with each other, and have a shape in which they are united in a part of the circumferential direction.

Further, as the second modification, the fuel tank 160 shown in Fig. 5B may be employed. The fuel tank 160 of the second modification has an upper plate portion 161 and a lower plate portion 162 extending along the axis O and facing each other in the vertical direction. Both sides of the upper plate portion 161 and the lower plate portion 162 in the line width direction are connected in an arc shape by a curved portion 163.

Further, as a third modification, the fuel tank 170 shown in Fig. 5C may be employed. The fuel tank 170 of the third modification is constituted by a rectangular cylindrical portion 171 having a rectangular cross-section extending along the axis O.

In any of the first to third modifications, the fuel tanks 150, 160, and 170 have an outer circumferential surface extending along an axis O inclined downward toward the bow and an upper tank included in the outer circumferential surface. It has a line La and a lower tank line Lb. Therefore, it exhibits the same effect as in the embodiment.

In the embodiment, the fuel stored in the fuel tank 50 is LPG, but for example, other liquefied gas such as LNG may be used as the fuel. Further, the cargo stored in the cargo tank 30 is not limited to LPG, and other liquefied gases may be used. Further, the cargo stored in the cargo tank 30 may be a liquid or material other than liquefied gas.

Industrial applicability

According to this ship, the size of the fuel tank and the fuel absorption property can be ensured while ensuring the view from the bridge.

10 hull
11 side
12 bottom
13 upper deck
14 engine room
15 cargo hold
20 bridge
21 cockpit
30 cargo tank
40 cycles
41 screw
50 fuel tank
51 Tongbu
52 Cover
60 tank support
61 bow side support
62 Stern side support
70 pump
71 plumbing
100 ships
150 fuel tank
151 Cylindrical part
160 fuel tank
161 Top
162 Lower plate
163 Curve
170 fuel tank
171
O axis
Lv line of sight required
La upper tank line
Lb lower tank line

Claims (5)

With hull,
A bridge disposed above the stern side of the hull,
A cycle provided in the hull,
A fuel tank provided on the fore side of the bridge on the upper deck of the hull and having an outer circumferential surface extending along an axis that inclines downward toward the bow while storing fuel of the cycle;
A ship including a pump for inhaling the fuel by providing a suction port in a portion of the fuel tank on the bow side. The method of claim 1,
A vessel in which an upper tank line and a lower tank line constituting the outer circumferential surface of the fuel tank as viewed from a line width direction are parallel to the axis line, respectively. The method of claim 2,
The upper tank line extends along a line of sight demanding that connects the bridge and the water surface in front of the bow, as viewed from a line width direction. The method according to claim 2 or 3,
The outer circumferential surface of the fuel tank is a ship having a cylindrical surface around the axis. The method according to any one of claims 1 to 4,
A cargo hold is formed in the hull,
A vessel disposed within the cargo hold and having a cargo tank for accommodating liquefied gas.

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