KR101444147B1 - A vessel with retractable thruster - Google Patents

Abstract

Disclosed is a ship provided with a pulling-in thruster. According to an embodiment of the present invention, there is provided a ship having an inletable thruster, comprising: a thruster; A canister coupled to the top of the thruster and driving the thruster; A trunk which is provided on the hull and in which the thruster and the canister are inserted and raised; And a seawater sealing unit provided between the inner wall of the trunk and the outer wall of the canister to prevent seawater from entering the upper part of the trunk, wherein the seawater sealing unit expands between the inner wall of the trunk and the outer wall of the canister, And an air tube module for sealing between the outer walls of the air tube module.

Description

A VESSEL WITH RETRACTABLE THRUSTER < RTI ID = 0.0 >

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ship having a pull-in thruster, and more particularly, to a ship having a pull-in thruster capable of preventing seawater from being introduced into an upper portion of a trunk.

Due to the rapid international industrialization and industrial development, the use of global resources such as petroleum is gradually increasing, and the stable production and supply of crude oil is becoming a very important issue on a global scale.

For this reason, recently marginal field or deep-sea oil field, which has been neglected due to lack of economic efficiency, has become economically feasible. Therefore, along with the development of submarine mining technology, One vessel is being developed.

Conventional submarine drilling vessels are mainly rig ships or fixed platforms dedicated to deep-sea drilling, which can be sailed only by a tugboat and perform submarine drilling at a certain point in the sea using a mooring device .

However, in recent years, a so-called drill ship having been manufactured in the same form as that of a general ship has been developed and installed in underwater drilling so as to mount a cutting-edge drilling rig and to navigate with its own power.

Ships such as drillships are designed to be able to navigate with their own power without a tugboat because of the work conditions that often require their position to be moved.

In addition, ships such as drillships are equipped with a dynamic positioning system that allows the vessel to be safely maintained at a certain drilling point in harsh marine conditions without using existing mooring equipment.

A key equipment used for main propulsion and self-positioning of such ships is azimuth thruster (hereinafter referred to as "thruster"), which is a kind of propulsion device.

Thrusters are mainly propulsion and position control propellers, which are located at the bottom of the bottom of the hull, equipped with propellers capable of rotating 360 degrees, and capable of propelling, propelling or rotating the ship.

For example, the thruster may be used when it is impossible to control the ship by the main thruster and the rudder, that is, to perform the magnetic position control to maintain the ship in a desired position with respect to disturbance such as tide and waves, It can also be used in case of trying to get on a marine structure.

Here, the position of the thrust disposed below the bottom of the hull for controlling the position of the ship is referred to as a dynamic positioning mode (hereinafter referred to as "DP mode").

However, the thruster is useful for position control of the ship in the DP mode. However, since the thruster is protruded to the bottom of the hull during the ship operation, the thruster becomes a resistor and deteriorates the operation efficiency of the ship.

Further, in the DP mode, since the diver must perform work such as installing, releasing, repairing, and repairing the thruster at the bottom of the hull bottom, that is, below the sea surface, the operation is dangerous and complicated and the operation efficiency is lowered.

In addition, when the thruster breaks down during the operation of the ship, the work for repairing and repairing is complicated and it is difficult to collect it in the dock for repairing the hull due to the structure protruding from the lower part of the hull.

In order to solve the above problems, there have been proposed methods of projecting outside the hull at the time of magnetic position control, and introducing the thrusters into the hull during operation.

In the method of retracting the thrusters themselves, a propeller for generating thrust is installed at the lower end of the main shaft, and the main shaft is raised along a guide member provided inside the hull to draw the thrusters themselves into the hull will be.

This method is mainly used for small and medium sized vessels because there is a limit to the stiffness of the body shaft in which the propeller is installed in relation to the thruster propulsion force.

This is for the purpose of reducing the resistance in a state in which a thruster is drawn in the inside of the hull at the time of the operation of the ship (aka "Transit mode"). In repairing and repairing the thruster, There is still a problem that work must be performed below the sea level.

Therefore, in order to overcome the problem of the method of pulling the thrusters themselves and to apply them to large ships, and to overcome the rigidity limit of the conventional body shaft, a canister, which supports the thrusters, And a method of raising the thruster and the canister to the upper part of the waterline of the ship inside the hull has been proposed.

That is, a method of introducing a thruster and a canister is to install a vertical tunnel, i.e., a trunk, vertically lifting the canister and thruster to the hull, and raising and lowering the canister and the thruster in the trunk.

In the case where the thrusters are projected from the bottom of the hull and the bottom of the canister is located at the lower end of the trunk, The risk of seawater infiltration into the trunk is small.

However, during operation of the ship, the thruster and the canister are drawn into the inside of the trunk and the lower end of the trunk is opened, so that seawater flows into the inside of the trunk.

Especially, inside the trunk, maintenance space is provided near the waterline. There is a problem that the safety of the operator is deteriorated when seawater flows into the inside of the trunk.

Korean Patent Publication 2001-0108293 (Global Marine Incorporated) 2001.12.07.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a ship having an inlet thruster capable of preventing the inflow of seawater to the upper part of a trunk to solve the problem of stability.

According to an aspect of the present invention, there is provided a thruster; A canister coupled to an upper portion of the thruster and driving the thruster; A trunk which is provided on the hull and in which the thruster and the canister are inserted and raised; And a seawater sealing unit provided between an inner wall of the trunk and an outer wall of the canister to prevent seawater from entering the upper portion of the trunk, wherein the seawater sealing unit comprises: And an air tube module for sealing between the inner wall of the trunk and the outer wall of the canister.

Wherein the air tube module expands and contracts between an inner wall of the trunk and an outer wall of the canister to seal and unseal the inner wall of the trunk and the outer wall of the canister; And an air tube operating part connected to the air tube, for supplying air to the air tube and recovering air from the air tube.

Wherein the seawater sealing unit further comprises a compartment provided in any one of an inner wall of the trunk and an outer wall of the canister, wherein the air tube module is contained and opened and closed, and wherein the inner wall of the trunk and the outer wall of the canister The compartment may be opened to expand the air tube and to close the air tube and to close the compartment when the compartment is to be unsealed between the inner wall of the trunk and the outer wall of the canister.

The seawater sealing unit may further include an air tube supporting portion provided on one of the inner wall of the trunk and the outer wall of the canister for contacting and supporting the air tube when the air tube expands can do.

The air tube support portion includes an air tube support plate protruding from the upper portion of the compartment when the air tube expands and supporting the air tube in contact therewith; And a driving unit connected to the air tube supporting plate and allowing the air tube supporting plate to protrude and retract from the upper part of the compartment.

A maintenance space may be formed in the trunk above the waterline to maintain the thruster, and the seawater sealing unit may be provided under the maintenance space.

Embodiments of the present invention can improve stability by providing a seawater sealing unit that seals between the inner wall of the trunk and the outer wall of the canister to prevent seawater from entering the upper part of the trunk.

1 is a perspective view illustrating a ship having a throwable thruster according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, showing a state where the thruster is positioned at the first position according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view taken along the line AA of FIG. 1, showing a state where the thruster is positioned at the second position according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view taken along the line AA of FIG. 1, showing a state where the thruster is positioned at the third position according to an embodiment of the present invention;
5 is an enlarged perspective view showing a state before operation of the seawater sealing unit according to an embodiment of the present invention.
FIG. 6 is an enlarged perspective view illustrating a state after operation of the sea water sealing unit according to an embodiment of the present invention. FIG.
7 is a cross-sectional view showing a state before the seawater sealing unit according to the embodiment of the present invention is operated in a state where the thruster is in the second position.
8 is a cross-sectional view showing the state after the seawater sealing unit according to the embodiment of the present invention is operated in a state where the thruster is in the second position.

In order to fully understand the present invention, operational advantages of the present invention, and objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the accompanying drawings which illustrate preferred embodiments of the present invention.

Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.

The ship according to the present invention can be used as a drill ship for drilling submarine crude oil, a ship for transporting people or cargo, a liquefied natural gas-floating production storage off-loading (LNG-FPSO) And floating structure (FSU: Floating Storage Unit).

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings, in which a ship having an inlet thruster according to an embodiment of the present invention will be described in detail.

FIG. 1 is a perspective view showing a ship having a pull-in thruster according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, FIG. 3 is a cross-sectional view taken along line AA of FIG. 1, showing a state where the thruster is positioned at a second position according to an embodiment of the present invention, FIG. 4 is a cross- FIG. 5 is an enlarged perspective view showing a state before operation of the seawater sealing unit according to an embodiment of the present invention, and FIG. 6 is an enlarged perspective view of the seawater sealing unit according to the embodiment of the present invention. FIG. 5 is an enlarged perspective view showing an after-operation state of a seawater sealing unit according to an embodiment.

Referring to FIGS. 1 to 6, a ship having a take-in thruster according to an embodiment of the present invention includes a thruster 200 and a thruster 200 coupled to an upper portion of the thruster 200 A trunk 400 mounted on the hull 100 and having a thruster 200 and a canister 300 inserted thereinto and a canister 300 mounted on the canister 300. The canister 300 includes a drive device (not shown) And a seawater sealing unit 400 provided between the inner wall of the trunk 400 and the outer wall of the canister 300 to prevent seawater from entering the upper part of the trunk 400, (600).

The thruster 200 is disposed below the bottom surface 110 of the hull to serve to propel, deflect or rotate the ship and to provide propulsion for the ship's magnetic position control.

In particular, in the present embodiment, the thruster 200 is mainly used for magnetic position control for moving the ship to a specific position and holding the ship at that position.

A plurality of thruster (200) are provided at the stern portion and bow portion of the hull.

When the ship is moved, the thruster 200 located at the forefront portion enters the inside of the trunk 400 because it becomes a resistor, and provides thrust force using the thruster 200 located at the aft portion.

When controlling the self position of the ship, the thruster (200) located at the fore and aft portions is protruded downward from the bottom surface (110) of the hull to control the magnetic position.

In this embodiment, the thruster 200 uses an azimuth thruster used for propulsion and magnetic position control. However, the scope of the present invention is not limited to this, And a propulsion unit that is installed at a lower portion of the hull 100 to provide propulsion force or the like.

On the other hand, the thruster 200 described below will be described as an example of a whirling thruster.

The thruster 200 includes a propeller 210 disposed inside the circular nozzle protection plate 250 to provide propulsive force in response to rotation and a power transmission device (not shown) (Not shown).

The hub 230 receives the power transmitted from the driving device (not shown) provided in the canister 300 through the vertical shaft 270 and transmits the transmitted power to the hub 230 through a power transmitting device Thereby providing rotational force to the propeller 210.

The canister 300 is coupled to the upper portion of the thruster 200 to transmit power to the thruster 200. In addition, the canister 300 also serves to support the thruster 200.

When the thruster 200 operates below the bottom surface 110 of the hull, the canister 300 supports the thruster 200 against the propulsion of the thruster 200 and is positioned below the bottom surface 110 of the hull Thereby maintaining the position of the thruster 200 positioned.

In this embodiment, the canister 300 is formed of a plurality of compartments (not shown), and each compartment is formed to be isolated from each other. A driving device (not shown) for driving the propeller 210 of the thruster 200 is installed in the compartment.

On the other hand, the canister 300 is formed with an inlet and an outlet (not shown) so as to be able to enter and exit the canister. The canister 300 is lifted and lowered in the interior of the trunk 400, that is, the space 410 by the lifting device 500. At this time, the thruster 200 coupled to the canister 300 is also raised and lowered .

The trunk 400 serves as a passage through which the thruster 200 and the canister 300 ascend and descend.

The trunk 400 is formed so as to be opened from the bottom surface 110 of the hull to a deck 130, that is, perpendicularly to the height direction of the hull 100.

That is, the space portion 410 is formed inside the trunk 400, and the thruster 200 and the canister 300 are inserted and raised in the space portion 410. The space portion 410 and the trunk 400 have a watertight structure with respect to the inside of the hull 100.

In the present embodiment, a plurality of trunks 400 are formed on the stern portion and the forefront portion of the hull 100 symmetrically with respect to the longitudinal direction of the hull 100, The thruster 200 and the canister 300 are vertically moved up and down in the vertical direction.

As shown in FIGS. 2 to 4, a stopper 450 protruding into the space 410 is installed along the inner wall of the lower end of the trunk 400. A protrusion 310, which is seated on the stopper 450, is installed on the outer wall of the canister 300.

A plurality of stoppers 450 may be provided at predetermined intervals along the inner wall of the lower portion of the trunk 400 or may be integrally installed along the inner wall of the lower portion of the trunk 400.

A plurality of protrusions 310 may be provided at predetermined intervals along the lower outer wall of the canister 300 so as to correspond to the stopper 450 or may be integrally installed along the lower outer wall of the canister 300.

As described above, the stopper 450 and the protrusion 310 are provided at the lower portion of the trunk 400 and the lower portion of the canister 300 to prevent the thruster 200 and the canister 300 from falling out of a predetermined range, The stopper 450 and the sinker 310 may be installed on the inner wall of the trunk 400 and the outer wall of the canister 200 to closely contact each other, It is possible to prevent the liquid from flowing into the upper portion.

The lifting and lowering device 500 functions to raise and lower the thruster 200 and the canister 300 in the space portion 410 of the trunk 400.

More specifically, as shown in FIG. 2, the elevating apparatus 500 includes a thruster 200 disposed below the bottom surface 110 of the hull to control the magnetic position of the hull 100, 3, and a thruster 200 positioned at the forefront portion is drawn between the bottom surface 110 of the hull and the waterline 150 that is hermetically sealed by the sea water, as shown in FIG. 3, A second position (also referred to as a transit mode) for reducing the resistance of the thruster 200 and a thruster 200 disposed above the waterline 150 as shown in FIG. 4 to perform operations such as installation, (Aka, Maintenance mode).

On the other hand, in order to facilitate the access to the thruster 200 and realize the safe operation in the case where the thruster 200 is to be repaired or repaired at the third position, the inner wall of the trunk 400 A maintenance space 430 is formed above the waterline 150.

The maintenance space 430 is located at the upper part of the waterline 150 and a sufficient space is secured for the operator to remove the propeller 210 of the thruster 200 and then load it.

The elevating apparatus 500 may be configured such that the actuator 510 is coupled to the frame 530 vertically installed on the deck 130 of the hull 100 and the actuator 510 is connected to the upper portion of the canister 300 The thruster 200 and the canister 300 are moved up and down in the trunk 400 and the space portion 410.

Here, the actuator 510 may be a hydraulic cylinder, a pneumatic cylinder, or a combination thereof.

The thruster 200 and the canister 300 are lifted and lowered in the interior of the trunk 400, that is, the space portion 410 by the extension and retraction of the actuator 510.

The elevating apparatus 500 includes the actuator 510 and the elevating apparatus 500 is not limited to the elevator 500. The elevating apparatus 500 may include the thruster 200 and the canister 300, Any means can be used.

For example, although not shown in the present embodiment, the elevating apparatus 500 includes a cable (not shown) connected to the canister 300, a cable winding (not shown) installed on the deck 130 of the hull 100, Unit (not shown).

Here, the cable may be a wire rope, a chain, or the like, and a winch or the like may be used as the cable winding unit.

That is, by repeating the operation of connecting one end of the cable to the canister 300 and winding and unwinding the other end of the cable to the cable winding unit, the thruster 200 and the canister 300 are connected to the space portion 410 of the trunk 400 ).

The elevating device 500 is provided with a pinion gear (not shown) on the inner wall of the trunk 400 and a rack gear (not shown) provided on the canister 300, The stirrer 200 and the canister 300 can be raised and lowered in the interior of the trunk 400, that is, the space portion 410.

In addition, according to one embodiment of the present invention, a ship having a pull-in thruster may be configured to secure the canister 300 to the trunk 400 so that the thruster 200 is stably positioned at the first, And may further include a locking device (not shown).

The locking device serves to prevent the canister 300 from moving against the inner wall of the trunk 400 with respect to disturbance such as blue.

The locking device includes a plurality of locking pins (not shown) spaced apart from each other by a predetermined distance from the space 410 of the trunk 400, that is, the inner wall of the trunk 400, (Not shown) into which a plurality of locking pins are inserted. Here, the locking pin can be installed so as to protrude and retreat into the space portion 410 by the hydraulic system.

When it is determined that the thruster 200 reaches a desired position among the first, second, and third positions, the elevating device 500 is stopped and the locking pin is inserted into the groove portion by protruding into the space portion 410.

The canister 300 is fixed on the space portion 410 by the engagement of the locking pin and the groove portion, and the thruster 200 can be stably disposed at a desired position.

The seawater sealing unit 600 serves to prevent seawater from entering the upper part of the trunk 400.

1 through 6, the seawater sealing unit 600 expands between the inner wall of the trunk 400 and the outer wall of the canister 300 to seal or seal the inner wall of the trunk 400 and the outer wall of the canister 300, When the ship is operated in a state where the thruster 200 is raised to the inside of the trunk 400, that is, the second position, the seawater is supplied to the upper part of the trunk 400, Thereby preventing the inflow of foreign matter.

Particularly, the seawater sealing unit 600 is provided below the maintenance space 430 formed in the trunk 400 to prevent the seawater from flowing into the maintenance space 430.

5 and 6, the seawater sealing unit 600 expands between the inner wall of the trunk 400 and the outer wall of the canister 300 to seal the inner wall of the trunk 400 and the outer wall of the canister 300, A compartment 630 provided in one of the inner wall of the trunk 400 and the outer wall of the canister 300 and having an air tube module 610 therein and being opened and closed, An air tube support portion (not shown) disposed on one of the inner wall of the canister 300 and the outer wall of the canister 300 and disposed above the compartment 630 to support the air tube module 610 when the air tube module 610 expands 650).

The air tube module 610 serves to prevent seawater from entering the upper part of the maintenance space 430, particularly in a state where the ship is in operation while the thruster 200 is raised to the second position.

That is, the air tube module 610 is installed in the lower part of the maintenance space 430 to prevent the seawater from flowing into the air tube module 610 at a height higher than the installed height.

The air tube module 610 is configured to expand and contract between the inner wall of the trunk 400 and the outer wall of the canister 300 to seal and seal the space between the inner wall of the trunk 400 and the outer wall of the canister 300. [ A tube 611 and an air tube operating portion 613 connected to the air tube 611 and supplying air to the air tube 611 and recovering air from the air tube 611.

The air tube 611 seals the inner wall of the trunk 400 and the outer wall of the canister 300 and blocks the inflow of seawater into the upper part of the trunk 400.

In this embodiment, the air tube 611 may be a single air tube or a plurality of unit air tubes. The air tube 611 is disposed around the inner wall of the trunk 400 or around the outer wall of the canister 300.

Here, the air tube 611 is made of a waterproof material for seawater. The air tube 611 is made of an elastic material that can be stretched and contracted to come in contact with the inner wall of the trunk 400 and the outer wall of the canister 300. That is, the air tube 611 may be made of rubber or the like.

The inner wall of the trunk 400 and the outer wall of the canister 300 are closely contacted to seal the inner wall of the trunk 400 and the outer wall of the canister 300 when the air tube 611 is inflated.

Therefore, seawater is prevented from flowing into the upper portion of the air tube 611.

When the air tube 611 is contracted, the inner wall of the trunk 400 and the outer wall of the canister 300 are sealed.

The air tube 611 is contained in a compartment 630 provided on the inner wall of the trunk 400 or the outer wall of the canister 300.

The compartment 630 is opened to inflate the air tube 611 and the space between the inner wall of the trunk 400 and the outer wall of the canister 300 can be reduced by opening the compartment 630 to close the space between the inner wall of the trunk 400 and the outer wall of the canister 300. [ The air tube 611 is retracted and the air tube 611 is housed in the compartment 630 and then the compartment 630 is closed.

The air tube 611 is expanded or contracted in the direction of the outer wall of the canister 300 or the inner wall of the trunk 400 by the air tube operating portion 613 while being accommodated in the compartment 630. The air tube operating portion 613 are provided with an air pump 614 for supplying air to the air tube 611 and for recovering air from the air tube 611 and a pipeline 615 for connecting the air pump 614 to the air tube 611 .

The air tube 611 expands or contracts according to the operation of the air pump 614.

The air tube supporting portion 650 serves to prevent the position of the air tube 611 from being displaced by the pressure of seawater when the air tube 611 is inflated.

The air tube support portion 650 includes an air tube support plate 651 protruding from the upper portion of the compartment 630 to support the air tube 611 when the air tube 611 expands, And a driving unit 653 connected to the air tube support plate 651 and allowing the air tube support plate 651 to protrude / retract from the upper portion of the compartment 630.

The air tube support plate 651 is configured to be capable of protruding and retracting to the upper portion of the air tube 611 by the operation of the driving unit 653 in a state of being housed in the inner wall of the trunk 400 and the outer wall of the canister 300 do.

That is, when the air tube 611 is inflated in the compartment 630 to seal between the inner wall of the trunk 400 and the outer wall of the canister 300, one end of the air tube support plate 651 is connected to the outer wall of the canister 300, Or the inner wall of the trunk 400 to contact and support the air tube 611. When the air tube 611 is retracted and housed in the compartment 630, one end of the air tube support plate 651 is connected to the canister 300 Or the inner wall of the trunk 400. As shown in FIG.

This is to prevent the rising of the air tube 611 due to buoyancy of the seawater so as to prevent the seawater from flowing to a desired position or more, that is, above the height at which the air tube 611 is disposed.

The air tube support plate 651 is projected and retracted from the upper portion of the compartment 630 by the driving unit 653. The driving unit 653 is connected to the air tube support plate 651 to be extended and contracted, (651).

Here, the actuator 653 may be a hydraulic cylinder, a pneumatic cylinder, or a combination thereof.

Hereinafter, the operation of the ship having the inlet thruster according to the embodiment of the present invention will be described.

FIG. 7 is a cross-sectional view showing a state before the seawater sealing unit according to the embodiment of the present invention is in a state where the thruster is in the second position, FIG. 8 is a cross- FIG. 5 is a cross-sectional view showing the state after operation of the seawater sealing unit according to FIG.

Referring to FIG. 7, the thruster 200 is raised to the second position in order to minimize the resistance applied to the ship 100 when operating the ship. Therefore, seawater flows into the trunk 400 through the lower portion of the trunk 400.

The incoming seawater can be raised to the top of the trunk 400 along the clearance between the inner wall of the trunk 400 and the outer wall of the canister 300 during the operation of the vessel, The seawater can be introduced into the maintenance space 430 provided in the vicinity of the main body 150, and safety of the operator can be prevented.

8, the seawater sealing unit 600 is used to seal the inner wall of the trunk 400 and the outer wall of the canister 300, thereby preventing the seawater from further flowing into the upper portion of the trunk 400 can do.

The thruster 200 is raised to the second position and then the inner wall of the trunk 400 or the outer wall of the canister 300 And air is supplied to the air tube 611 accommodated in the compartment 630 to inflate the air tube 611 so that the air tube 611 is expanded between the inner wall of the trunk 400 and the outer wall of the canister 300 Seal it.

The air tube 611 is contacted and supported by the air tube support plate 651 in order to prevent the air tube 611 from rising above a set height by the pressure of the seawater.

Meanwhile, in the process of sealing the inner wall of the trunk 400 and the outer wall of the canister 300, the seawater stored in the upper portion of the air tube 611 can be invaded into the maintenance space 430 by the slushing phenomenon caused by the swinging of the ship have. Therefore, it is necessary to discharge seawater for safe operation in the maintenance space 430.

Therefore, the seawater remaining on the upper portion of the air tube 611 is discharged to the outside of the trunk 400 and the hull 100 by using a seawater discharge unit (not shown).

Here, the seawater discharge unit (not shown) has a drain pipe line (not shown), one end of which is disposed on the upper portion of the air tube 611 and the other end is disposed on the outside of the hull 100 to discharge seawater remaining in the trunk 400 (Not shown), and a drain pump (not shown) connected to the drainage pipeline.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Accordingly, such modifications or variations are intended to fall within the scope of the appended claims.

100: Hull 110: Bottom surface of the hull
130: Deck 150: Waterline
200: Thruster 210: Propeller
230: hub 250: circular nozzle closure
270: vertical axis 300: canister
310: protrusion 400: trunk
410: 430: Maintenance space
450: stopper 500: lifting device
510: Actuator 530: Frame
600: Seawater sealing unit 610: Air tube module
611: air tube 613: air tube operating part
614: Air pump 615: Pipeline
630: compartment 650: air tube support
651: air tube support plate 653:

Claims (6)

A thruster (200);
A canister 300 coupled to an upper portion of the thruster 200 to drive the thruster 200;
A trunk (400) provided on the hull (100) and on which the thruster (200) and the canister (300) are inserted and elevated; And
And a seawater sealing unit 600 provided between the inner wall of the trunk 400 and the outer wall of the canister 300 to prevent seawater from entering the upper portion of the trunk 400,
The seawater desalination unit (600)
An air tube 611 that expands and contracts between the inner wall of the trunk 400 and the outer wall of the canister 300 to seal and unseal the space between the inner wall of the trunk 400 and the outer wall of the canister 300, And an air tube operating part 613 connected to the air tube 611 and supplying air to the air tube 611 and recovering air from the air tube 611, An air tube module (610) for sealing between the outer walls of the canister (300);
The air tube module 610 is installed in one of the inner wall of the trunk 400 and the outer wall of the canister 300. The air tube module 610 is installed between the inner wall of the trunk 400 and the outer wall of the canister 300 The air tube 611 is contracted and closed when the air tube 611 is opened to open the space between the inner wall of the trunk 400 and the outer wall of the canister 300. [ Compartment 630; And
The air tube 611 is disposed on one of the inner wall of the trunk 400 and the outer wall of the canister 300 and is disposed at an upper portion of the compartment 630. When the air tube 611 expands, And an air tube support (650) for supporting the air tube. delete delete delete The method according to claim 1,
The air tube support portion 650 includes:
An air tube support plate 651 protruding from the upper portion of the compartment 630 to support the air tube 611 when the air tube 611 expands; And
And a drive unit (653) connected to the air tube support plate (651) to allow the air tube support plate (651) to protrude / retract from the upper portion of the compartment (630). The method according to claim 1,
A maintenance space 430 is formed in the trunk 400 above the waterline 150 to maintain the thruster 200,
Wherein the seawater-sealing unit (600) is provided below the maintenance space (430).

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