KR101523725B1

KR101523725B1 - Ship

Info

Publication number: KR101523725B1
Application number: KR1020130091706A
Authority: KR
Inventors: 정재권; 김진학; 이경준; 이정훈; 한재문
Original assignee: 삼성중공업 주식회사
Priority date: 2013-08-01
Filing date: 2013-08-01
Publication date: 2015-05-28
Also published as: KR20150015824A

Abstract

The vessel is started. A ship according to an embodiment of the present invention includes: a hull; A propeller coupled to the hull to generate thrust; An air injection unit rotatably coupled to the hull so as to inject compressed air toward the hull adjacent to the propeller in order to reduce vibration caused by fluctuating pressure generated in the water during operation of the propeller, And a monitoring unit coupled to the air ejecting unit at the inside of the air ejecting unit and rotated in conjunction with rotation of the air ejecting unit.

Description

Ship {SHIP}

The present invention relates to a ship, and more particularly, to a ship capable of monitoring the rear of the hull to prevent the deterioration of the function of the air injection unit from contamination of marine life, and the degree of contamination or erosion of propellers, rudders, .

Generally, a propulsion device of a ship is a device that generates thrust for ship operation and usually uses a propeller.

That is, the ship is operated using the thrust generated when the propeller rotates. When the propeller rotates, due to the difference in pressure before and after the propeller, the seawater around the propeller is pushed to generate thrust necessary to propel the ship do. The thrust generated in this manner allows the ship to be operated at sea.

On the other hand, when the propeller is operated for the operation of the ship, that is, when the propeller rotates in water, a fluctuating pressure is generated in the water due to the propeller as the rotating body. The fluctuating pressure thus generated increases the excitation force to the hull, (Including noise).

Particularly, when cavitation occurs on the surface of the propeller blade due to high-speed rotation of the propeller, the fluctuating pressure rapidly increases and the excitation force is further increased, so that the vibration of the hull is severely generated.

This is because, when the propeller is operated in water, the propeller rotates in a non-uniform flow field formed by the stern shape, and when the pressure of the propeller blade surface drops below the saturated water vapor pressure in the specific blade position area, And the bubbles thus generated rupture rapidly when the pressure reaches a relatively high portion along the rotation of the propeller blade, thereby generating a strong fluctuating pressure in the water.

In order to solve the problem of increased excitation force due to such fluctuating pressure, it is necessary to design the shape and size of the propeller blade itself differently, to improve the shape of the rear of the ship, to attach a separate reinforcing material for preventing noise and vibration, Or by applying various methods such as attaching a guide device for guiding the flow of the water flowing in the propeller, reducing the size of the propeller, or the like. However, it is practically effective to reduce the excitation force it's difficult.

On the other hand, the vibration problem including the noise transmitted to the hull due to the fluctuating pressure due to the propeller increases due to the fluctuating pressure of the propeller. For example, when the ship is a cruise ship, This is something that needs to be addressed.

At present, in order to reduce the occurrence of vibrations in the hull due to the increase of the excitation force due to the fluctuating pressure generated in the operation of the propeller, a method of forming an air layer on the surface of the hull adjacent to the propeller is under study, It is planned to apply.

A module for generating an air layer, for example, a module such as an air injector, is fixed to the hull so that air bubbles are blown from the module to form an air layer on the surface of the hull.

Such a module is generally fixed in a state protruding outside the hull. When the module is fixed in a state protruding outwardly of the hull, the bubble jetting hole of the module is blocked by a marine life such as a barnacle, The shape of the bubble jetting hole may be deformed so that air, that is, compressed air may not be injected properly.

If the air is not properly injected, it is difficult to achieve the purpose of reducing the generation of vibrations due to the intrinsic purpose of the module, that is, the fluctuating pressure generated during the operation of the propeller. Is required.

In addition, propellers and rudders on marine vessels may be contaminated by marine organisms, resulting in degraded performance and erosion due to cavitation. In the conventional case, an operator may directly obtain the water and use propellers and rudders Pollution degree or erosion degree.

However, in an environment with extremely low water temperature or a dangerous underwater environment, it may not be possible for a worker to submerge in water, and even if a worker dives, it is necessary to check the degree of contamination or erosion of the propeller, There was a problem that might not be easy.

Japanese Patent Application Laid-Open No. 2000-255485

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an air injection unit that is disposed outside the hull only when the propeller is operated at a high speed, that is, when the fluctuating pressure due to cavitation of the propeller blade is large, The present invention is to provide a ship capable of preventing the deterioration of the function of the air injection unit from contamination and monitoring the back of the hull so that the degree of pollution or erosion of the propeller and the rudder can be grasped.

According to an aspect of the present invention, there is provided a hull comprising: a hull; A propeller coupled to the hull to generate thrust; An air injection unit coupled to the hull so as to inject compressed air toward the hull adjacent to the propeller in order to reduce vibrations caused by fluctuating pressures generated in the water during operation of the propeller, And a monitoring unit coupled to the air injection unit to monitor the rear of the hull.

Further, the monitoring unit may include: a camera capable of observing the outside of the hull; And a camera protection unit provided to surround the camera and coupled to the air injection unit.

The camera may include a camera lens, and the camera protection unit may be provided with a transparent window in a direction in which the camera lens is located.

In addition, the hull further includes a rudder for adjusting the direction of travel of the hull, and the camera is adapted to guide at least one of the propeller and the rudder to the incinerator to observe the degree of contamination or erosion of at least one of the propeller and the rudder. .

The air injection unit may be rotatably coupled to the hull, and the monitoring unit may be coupled to the air injection unit on the inner side of the air injection unit to rotate in conjunction with rotation of the air injection unit.

The air injection unit may further include: a rotating shaft coupled to the hull; A rotating plate coupled to the rotation shaft and rotatable, the rotation unit being coupled to the monitoring unit; And a spray nozzle coupled to the rotating plate and spraying the compressed air to the hull.

The spraying nozzle or the monitoring unit may be disposed on the outer side and the inner side of the hull by rotation of the rotating plate.

In addition, the injection nozzle and the monitoring unit may be provided so as to be respectively located in a direction opposite to the outside of the hull and the inside of the hull.

The hull may further include an inner hull inner protrusion coupled to the rotary shaft so as to extend to the inner side of the hull.

In addition, a water inflow prevention cover may be coupled to the hull inner side protrusion to prevent the water outside the hull from flowing into the inside of the hull when the rotating plate rotates.

The water inflow prevention cover may be provided so as to be openable and closable.

Embodiments of the present invention are provided such that only when the propeller is operated at a high speed, that is, when the fluctuating pressure due to cavitation of the propeller blades becomes large, the air injection unit is provided to be disposed outside the hull, It is possible to prevent the deterioration of the function of the injection unit and also to monitor the rear of the hull so that the degree of pollution or erosion of the propeller, the rudder, etc. can be grasped.

1 is a schematic side view of a ship according to an embodiment of the present invention.
FIG. 2 is a perspective view of a ship in which an air injection unit is located inside a hull according to an embodiment of the present invention. FIG.
3 is a cross-sectional perspective view of the ship in which the air injection unit is located inside the hull according to an embodiment of the present invention.
4 is a cross-sectional perspective view of the ship in which the air injection unit is located outside the hull according to an embodiment of the present invention.
5 is a side cross-sectional view of the ship in which the air injection unit is located inside the hull according to an embodiment of the present invention.
FIG. 6 is a side cross-sectional view of the ship in which the air injection unit is located outside the hull according to an embodiment of the present invention. FIG.

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.

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

FIG. 1 is a schematic side view of a ship according to an embodiment of the present invention. FIG. 2 is a perspective view of a ship in which an air injection unit is located inside a hull, FIG. FIG. 4 is a cross-sectional perspective view of a ship in which an air injection unit is located outside a hull according to an embodiment of the present invention, and FIG. 4 5 is a side cross-sectional view of the ship according to the embodiment of the present invention in which the air injection unit is located inside the hull, FIG. 6 is a side view of the ship in which the air injection unit is located outside the hull, Sectional view.

The ship 100 according to an embodiment of the present invention includes all vessels 100 that carry a person or a cargo with a self-contained ability such as a commercial vessel, a warship, a fishing vessel, a carrier, a drill ship, a cruise ship, And may also include floating marine structures for storing and unloading cargo such as Floating Production Storage Offloading (FPSO) and Floating Storage Unit (FSU).

Referring to FIG. 1, the ship 100 may include a hull 200, a propeller 300 coupled to the hull 200 to generate thrust, and a rudder 500.

The hull 200 can be divided into a forward portion, a central parallel portion, and a stern portion along the longitudinal direction of the hull 200. The hull 200 can be loaded with cargo, .

1, the propeller 300 includes a propeller blade 310, a hub 320 provided in a central region of the propeller blade 310, and a hub 320 coupled to a rear end of the hub 320 And may include a boss cap 330.

Here, as described above, the propeller 300 is coupled to the hull 200 to generate thrust. That is, when the propeller blade 310 rotates, the propeller blade 310 pushes the seawater around the propeller blade 310 due to the pressure difference between the propeller blade 310 and the propeller blade 310 , The thrust necessary to propel the ship 100 is generated.

One side of the propeller rotating shaft (not shown) is connected to the hub 320 and the other side of the propeller rotating shaft (not shown) is connected to an engine (not shown) inside the hull 200, .

1, the rudder 500 is disposed adjacent to the propeller 300 at the rear of the hull 200 to adjust the traveling direction of the hull 200. As shown in FIG.

As described above, when the propeller 300 operates, that is, when the propeller blade 310 rotates in water, a fluctuating pressure is generated in the water. The fluctuating pressure thus generated increases the excitation force to the hull 200 Thereby generating vibration (including noise) in the hull 200.

The vibration transmitted to the hull 200 may be a serious problem in the case of a ship 100 that is intended for a cruise such as a cruise ship or a ship 100 for which a quiet operation should be premised such as a warship. .

Here, in order to reduce vibration caused by fluctuating pressure generated in the water during operation of the propeller 300 in the hull 200, the ship 100 according to an embodiment of the present invention may include an air injection unit 400).

Referring to FIG. 1, the air injection unit 400 is coupled to one side of the hull 200 so as to reduce the generation of vibration in the hull 200 due to excitation force, 200a, respectively.

As described above, when the propeller 300 is operated, the hull 200a adjacent to the propeller 300, that is, the hull 200 located close to the propeller 300 due to the fluctuating pressure, Vibration occurs.

Here, the air injection unit 400 injects the compressed air 440 toward the hull 200 located close to the propeller 300, thereby reducing occurrence of vibration in the hull 200 through the air injection unit 400.

In detail, the spherical pressure wave generated by the cavitation during the operation of the propeller 300 can be propagated omnidirectionally. In this case, when the air layer is formed on the surface of the hull 200 around the propeller 300 by the compressed air 440 injected from the air injection unit 400 as in the present embodiment, Some are reflected out of the air layer with a phase close to approximately 180 degrees to the incident wave.

The reflected wave reflected from the air layer meets the incident wave which is a spherical pressure wave incident on the air layer again, thereby canceling / reducing the incident wave. The fluctuation pressure transmitted from the outside of the air layer to the hull 200 is reduced do.

When the fluctuating pressure transmitted from the outside of the air layer to the hull 200 is reduced, the exciting force is reduced, so that noise or vibration generated in the hull 200 is reduced.

However, when the air injection unit 400 is fixed in a state protruding outside the hull 200, the air injection unit 400 is clogged by a marine life such as a barnacle and the compressed air 440 is not properly sprayed Problems can arise.

In order to solve such a problem, the ship 100 according to an embodiment of the present invention is configured such that the air injection unit 400 is rotatably coupled to the hull 200, 200, respectively.

2 to 6, the air injection unit 400 may include a rotation axis 410, a rotating plate 420, and a spray nozzle 430.

The rotating shaft 410 is coupled to the hull 200 and the other end is connected to the rotating plate 420. When the rotating shaft 410 rotates while being supported by the hull 200, The rotating plate 420 connected to the rotating plate 420 is also rotated. Here, the rotary shaft 410 may be connected to various motors to receive rotational force.

Meanwhile, the rotating plate 420 may be formed in various shapes. Referring to FIG. 2, the rotating plate 420 may have a circular section.

The rotating plate 420 may be coupled with a spray nozzle 430 for spraying the compressed air 440 and a monitoring unit 600 for observing the rear of the hull 200.

3 to 6, the spray nozzle 430 is coupled to one side of the rotating plate 420, and the other side of the rotating plate 420, that is, the opposite side, The camera 610 may be coupled to the camera body 610 so as to protrude therefrom.

The spraying nozzle 430 and the monitoring unit 600 coupled to the rotating plate 420 are also rotated when the rotating plate 420 is connected to the rotating shaft 410. When the spraying nozzle 430 is rotated, Or the monitoring unit 600 can be located outside or inside the hull 200, respectively.

2, 3, and 5, the injection nozzle 430 may be located inside the hull 200. In this case, the monitoring unit 600 is located outside the hull 200. In this case, 4 and 6, when the rotating shaft 410 rotates and the rotating plate 420 rotates 180 degrees, the monitoring unit 600 is positioned inside the hull 200, And the nozzle 430 is located outside the hull 200.

When the injection nozzle 430 is located outside the hull 200, the hull 200 is compressed toward the hull 200a (see Fig. 1) adjacent to the propeller 300 through the injection nozzle 430 located outside the hull 200, The air 440 can be sprayed.

That is, when it is necessary to reduce the excitation force generated in the hull 200, the rotation plate 420 is rotated to position the injection nozzle 430 on the outer side of the hull 200, And the compressed air 440 is sprayed from the compressed air 440.

When the excitation force is not generated in the hull 200 or the ignition force generated in the hull 200 is in a negligible range, the rotation nozzle 420 is rotated so that the injection nozzle 430 is rotated by the hull 200 So that it is possible to prevent the jetting nozzle 430 from being contaminated by marine organisms.

That is, when the propeller 300 rotates at a high speed, the injection nozzle 430 is positioned outside the hull 200 to reduce the vibration of the hull 200 due to the excitation force, and the propeller 300 is rotated at low speed The injection nozzle 430 may be positioned inside the hull 200 so as to protect the injection nozzle 430. Here, the rotation speed of the propeller 300 for positioning the injection nozzle 430 inside the hull 200 may vary depending on the type of the ship 100 and the navigation purpose.

When the monitoring unit 600 is located outside the hull 200, the rear of the hull 200 can be observed through the monitoring unit 600 located outside the hull 200. A detailed description thereof will be given later, .

5 and 6, a compressed air transfer line 421 may be installed in the rotating plate 420 to allow the compressed air 440 to move. One side of the compressed air movement line 421 is connected to the injection nozzle 430 and the other side of the compressed air movement line 421 can be connected to the through opening 422 formed in the rotating plate 420.

The through opening 422 formed in the rotating plate 420 may be connected to the compressed air supply line 220 for supplying compressed air 440 to the rotating plate 420. Here, the compressed air supply line 220 may be installed in the hull 200.

1 and 6, the compressed air supply line 220 may be provided as a pipe through which compressed air 440 can move, and a compressor 230 may be installed at an end of the compressed air supply line 220 And the compressed air 440 compressed by the compressor 230 is moved along the compressed air supply line 220 provided by the pipe and is passed through the through hole on the rotating plate 420 connected to the compressed air supply line 220, May be introduced into the rotatable plate 420 through the guide plate 422.

The compressed air 440 flowing into the rotating plate 420 through the through opening 422 on the rotating plate 420 moves along the compressed air moving line 421 connected to the through opening 422 Through the injection nozzle 430 connected to one side of the compressed air transfer line 421.

2 to 6, the hull 200 may be formed with an inner hull inner protrusion 210 so as to extend to the inner side of the hull 200. As shown in Fig. Here, the rotating shaft 410 connected to the rotating plate 420 may be coupled to the inner hull protrusion 210.

The air inlet opening 211 corresponding to the through opening 422 formed in the rotating plate 420 may be formed in the inside protruding portion 210 of the hull and the compressed air supply line 220 may be formed in the air inlet opening 211 .

6, when the through-hole 422 and the air inlet opening 211 are communicated, the compressed air 440 moving through the compressed-air supply line 220 flows into the communicating air inflow opening 211, Passes through the through hole 211 and the through-hole 422, and flows into the inside of the rotating plate 420. As described above, the compressed air 440 flowing into the rotating plate 420 moves along the compressed air movement line 421 and is injected through the injection nozzle 430.

Here, when the rotation plate 420 rotates and the injection nozzle 430 is located outside the hull 200, the through hole 422 and the air inlet opening 211 can communicate with each other. A portion of the rotating plate 420 opposed to the portion where the through-hole 422 is formed is provided with a clogged portion 423 closed so that the compressed air 440 can not be moved. As shown in FIG. 5, Since the air inlet opening 211 is in contact with the clogged portion 423 of the rotating plate 420 when the rotating plate 420 rotates and the injection nozzle 430 is positioned inside the hull 200, The compressed air 440 can not enter the inside of the rotating plate 420.

That is, even when there is no valve capable of blocking the movement of the compressed air 440, when the injection nozzle 430 is positioned inside the hull 200, the compressed air 423 is blocked by the clogged portion 423 of the rotating plate 420 (440) can be blocked.

1, the compressed air supply line 220 may be provided with a valve 240 to control the supply of the compressed air 440 and the supply amount thereof.

3 to 6, a monitoring unit 600 may be coupled to the inside of the air injection unit 400. [ The camera 610 included in the monitoring unit 600 may protrude from one side of the opposite side of the rotating plate 420 to which the injection nozzle 430 is coupled.

Here, when the rotating plate 420 is rotated, the monitoring unit 600 rotates in conjunction with the rotation of the rotating plate 420. The injection nozzle 430 and the camera 610 included in the monitoring unit 600 are rotated by the rotation of the rotating plate 420 so that the outer side of the hull 200 and the inner side of the hull 200 face each other Respectively.

That is, when the rotating plate 420 rotates and the injection nozzle 430 is positioned outside the hull 200, the camera 610 is positioned inside the hull 200. In this case, Likewise, the generation of vibration in the hull 200 can be reduced by injecting the compressed air 440 through the injection nozzle 430.

When the rotation plate rotates 180 degrees and the injection nozzle 430 is positioned inside the hull 200, the camera 610 is located outside the hull 200. In this case, It is possible to observe the rear of the hull 200 through the hull 610.

In other words, when marine life such as a barnacle is attached to a propeller and a rudder, performance may be deteriorated, and erosion may occur on a propeller and a rudder due to cavitation. When the propeller 300 rotates at low speed The injection nozzle 430 is located inside the hull 200 and the camera 610 is located outside the hull 200. The propeller 300 or the rudder 200 is installed on the hull 200 through the camera 610, The pollution degree or the degree of erosion of the fuel cell 500 can be monitored.

Accordingly, it is possible to determine whether the operator is cleaning by observing the degree of contamination or erosion of the propeller 300 and the rudder 500 without having to get them into the water.

The monitoring unit 600 may include a camera 610 and a camera protection unit 620. The camera protection unit 620 may be made of a waterproof material to protect the camera 610 in water, .

The camera protection unit 620 is coupled to the inside of the rotating plate 420 and rotates together with the rotation of the rotating plate 420.

Here, the camera protection unit 620 is provided to surround the camera 610, and a part of the camera protection unit 620 may be provided as the transparent window 621. That is, a transparent window 621 may be provided in the camera protection unit 620 in the direction in which the camera lens 611 is positioned for the camera 610 to monitor the propeller 300 and the rudder 500, The controller 610 may monitor the propeller 300, the rudder 500, and the like through the transparent window 621.

Meanwhile, the camera 610 can observe the rear of the hull 200, and in particular, can monitor the propeller 300 and the rudder 500. Here, in order to monitor the propeller 300 and the ruder 500, the camera 610, and in particular, the camera lens 611, is directed to the direction in which the propeller 300 and the rudder 500 are positioned, .

The camera 610 may be provided so that the camera lens 611 can be tilted or driven at various angles. That is, the camera lens 611 may be disposed to face the propeller 300, or the camera lens 611 may be disposed to face the rudder 500 by driving the carer main body or the camera lens 611, The carousel body or the camera lens 611 may be moved so that the lens 611 faces another part to be monitored in the hull 200. [

1 to 6, a water inflow prevention cover 212 may be coupled to the inside of the hull inner side protrusion 210. As shown in FIG.

That is, when the rotating plate 420 is rotated while the hull 200 is in the water, the water flows into the inside of the hull 200 through the space between the hull 200 and the rotating plate 420 .

In order to prevent the inflow of water into the inside of the hull 200, a water inflow preventing cover 212 may be coupled to the upper portion of the inside hull 210 to surround a part of the hull inner side protrusion 210.

The water inflow preventing cover 212 may be openable and closable so that the rotatable plate 420 or the injection nozzle 430 can be repaired or repaired. Here, the water inflow preventing cover 212 may be coupled to the hull inner side protruding portion 210 through a coupling member such as a bolt and a nut.

2 to 4 show only a part (partial cut) of the water inflow preventing cover 212 for convenience of explanation, as shown in FIGS. 5 and 6, the water inflow preventing cover 212 So as to enclose the entire upper portion of the hull inner side projection 210.

4 and 5, water may be introduced between the rotating plate 420 and the inner hull inner protrusion 210, so that water is supplied between the rotating plate 420 and the inner hull inner protrusion 210, Sealing 450 for preventing inflow can be formed.

Here, the sealing part 450 may be made of rubber or synthetic resin, and may be provided in an O-ring shape.

Since the rotating plate 420 is connected to the rotating shaft 410 to rotate, water can be introduced through the space formed between the rotating shaft 410 and the inner side protruding portion 210. Therefore, a sealing process can be performed between the inner side protruding portion 210 and the rotary shaft 410 to prevent the inflow of water.

Hereinafter, the function of the air injection unit 400 is prevented from deteriorating due to contamination of marine organisms in the ship 100 according to an embodiment of the present invention, and the rear of the ship 200 is monitored to detect the presence of the propeller 300 The actions and effects of grasping the degree of contamination or erosion of the rudder 500 and the like will be described.

2 to 4, the rotating plate 420 is connected to the rotating shaft 410 and rotatably. The rotating plate 420 is coupled to the rotating plate 420 by the rotation of the rotating plate 420 The spraying nozzle 430 or the monitoring unit 600 can be positioned outside and inside the hull 200, respectively.

The monitoring unit 600 positioned at the opposed portion of the spraying nozzle 430 on the rotating plate 420 can be positioned inside and outside the hull 200 according to the position of the spraying nozzle 430 do.

4 and 6, when the jetting nozzle 430 is located outside the hull 200, the monitoring unit 600 provided on the opposite side of the jetting nozzle 430 is positioned on the hull 200, As shown in Fig.

When the injection nozzle 430 is located outside the hull 200, the through-hole 422 formed in the rotating plate 420 communicates with the air inlet opening 211 formed in the hull inner side protrusion 210 And the air inlet opening 211 is connected to the compressed air supply line 220 so that the compressed air 440 supplied through the compressed air supply line 220 is communicated with the communicating air inlet opening 211 and the through opening 422 To the inside of the rotating plate 420.

A compressed air movement line 421 connected to the injection nozzle 430 is provided in the rotation plate 420. The compressed air movement line 421 is provided with a through hole 422 formed in the rotating plate 420, The compressed air 440 flowing into the rotating plate 420 through the through opening 422 is moved to the injection nozzle 430 through the compressed air moving line 421.

The compressed air 440 moved to the injection nozzle 430 is injected toward the hull 200a adjacent to the propeller 300 through the injection nozzle 430 so that the hull 200 It is possible to reduce the occurrence of vibration.

In particular, when the monitoring unit 600 is located outside the hull 200, the rear of the hull 200, in particular, the propeller 300 and the rudder 500 ) Or the like can be monitored.

Thereby, the operator can monitor the rear of the hull 200 without getting into the water, and it is possible to grasp the degree of pollution or erosion of the propeller 300 and the rudder 500. The propeller 300, And the erosion due to cavitation or the like, the propeller 300 and the rudder 500 can be cleaned.

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: Ship 200: Hull
210: hull inner protrusion 211: air inlet opening
212: water inflow prevention cover 220: compressed air supply line
230: compressor 240: valve
300: Propeller 400: Air injection unit
410: rotating shaft 420: rotating plate
421: Compressed air moving line 422:
430: jet nozzle 440: compressed air
500: Rudder 600: Monitoring unit
610: camera 611: camera lens
620: Camera protection unit 621: Transparent window

Claims

hull;
A propeller coupled to the hull to generate thrust;
An air injection unit coupled to the hull so as to inject compressed air toward the hull adjacent to the propeller in order to reduce vibrations caused by fluctuating pressures generated in the water during operation of the propeller, And
And a monitoring unit coupled to the air injection unit to monitor the rear of the hull,
Wherein the air injection unit is rotatably coupled to the hull,
Wherein the monitoring unit is coupled to the air ejection unit and rotates in conjunction with rotation of the air ejection unit.

The method according to claim 1,
The monitoring unit comprises:
A camera capable of observing the outside of the hull; And
And a camera protection unit provided to surround the camera and coupled to the air injection unit.

3. The method of claim 2,
Wherein the camera comprises a camera lens,
Wherein the camera protection unit is provided with a transparent window in a direction in which the camera lens is located.

3. The method of claim 2,
The hull further comprises a rudder for adjusting the direction of travel of the hull,
Wherein the camera is oriented toward at least one of the propeller and the rudder to observe the degree of contamination or erosion of at least one of the propeller and the rudder.

delete

The method according to claim 1,
The air injection unit includes:
A rotating shaft coupled to the hull;
A rotating plate coupled to the rotation shaft and rotatable, the rotation unit being coupled to the monitoring unit; And
And a jet nozzle coupled to the rotating plate for jetting the compressed air to the hull.

The method according to claim 6,
Wherein the spraying nozzle or the monitoring unit is provided on the outer side and the inner side of the hull by rotation of the rotating plate.

8. The method of claim 7,
Wherein the jetting nozzle and the monitoring unit are respectively positioned in directions opposite to each other between an outer side of the hull and an inner side of the hull.

The method according to claim 6,
And a hull inner protrusion coupled to the rotation shaft, the hull inner protrusion being formed to protrude from the inside of the hull.

10. The method of claim 9,
In the hull inner projecting portion,
And a water inflow preventing cover for preventing inflow of water outside the hull to the inside of the hull when the rotating plate rotates.

11. The method of claim 10,
Wherein the water inflow preventing cover is openable and closable.