JP2792843B2 - Ship side thruster tunnel lid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening of a side thruster tunnel which is disposed along the left and right opening surfaces of a side thruster tunnel penetrating in a transverse direction of a hull at a submerged portion of a ship, that is, a submerged portion . The present invention relates to a side thruster tunnel lid for a ship that opens and closes a part.

[0002]

2. Description of the Related Art Conventionally, a side thruster tunnel in a tunnel type side thruster of a ship is usually formed so as to penetrate in a transverse direction of the hull at a portion below the water surface of the bow or stern of the hull, that is, at a submerged portion . At the bow or stern, the outer plates are inclined in both the stern direction and the vertical direction of the hull, so the left and right opening surfaces of the side thruster tunnel having a circular cross section do not become circular, and are generally almost It becomes elliptical. Along the opening surface of such a shape, a side thruster tunnel lid constituted by a lid blade rotating around the drive shaft is arranged, and when the side thruster tunnel is used, the lid blade is rotated to the open position and the side thruster is opened. When the thruster tunnel opening is opened and the side thruster tunnel is not in use, the lid blade is turned to the closed position so that the resistance of the water flow along the outer plate can be minimized. upon closing the opening, the lid blade tries to minimize the gap between the inner wall surface of the peripheral and side thruster tunnel the cover blade when in the closed position, generally, the lid blade in the open position inner wall surface and interfere with each other by the lid vanes turning the edge side thruster tunnel cover blade becomes difficult or impossible when rotated,
Moreover, so as not to periphery of the lid blade from interfering with the inner wall surface of the side thruster tunnel when rotating the lid blade from the closed position to the open position, the peripheral portion of the contour of pre lid blade excision Any attempt to in establishing the contour shape, generally, so that the large gap or no lid portion between the peripheral portion and the inner wall surface of the side thruster tunnel cover blade upon rotating the cap blade in the closed position occurs.

[0003] Therefore, the cover blade is divided into a plurality of cover blades rotating around a plurality of drive shafts parallel to each other, and the contour shape of each cover blade is determined when the cover blade is rotated to the open position. Along with having a contour shape in which the interference part of the peripheral edge is cut away so as not to interfere with the inner wall surface of the side thruster tunnel, when each of the lid blades is turned to the closed position, A widening portion is formed in each of the lid blades to cover a gap formed between an adjacent lid blade and an inner wall surface of the side thruster tunnel so that the opening of the side thruster tunnel can be closed tightly. Although it is conceivable, if the gap between the outer peripheral edge of the lid blade and the inner peripheral edge of the side thruster tunnel is reduced, the lid blade and the side thruster tunnel are reduced.
When the main body and the main body are formed of mutually different metal materials, electrolytic corrosion occurs between different metals, and corrosion occurs. Normally, the side thruster tunnel cover is fabricated of a copper alloy material, but the body of the side thruster tunnel is fabricated of ferrous material, conventionally, in such a side thruster tunnel lid, the anticorrosion against dissimilar metal intercrystalline corrosion Without being applied, the actual protection against corrosion of the side thruster tunnel lid relied on a sacrificial anode provided to protect the body of the side thruster tunnel . However, since the sacrificial anode in that case is not intended to prevent corrosion of the side thruster lid, the distance between the side thruster tunnel lid and the sacrificial anode is long, and therefore a sufficient current density necessary for the corrosion protection of the side thruster lid is required. Is not obtained,
The anticorrosion effect of the side thruster tunnel lid could hardly be expected.

[0004]

As described above [0006], the side thruster tunnel cover the peripheral portion of the side thruster tunnel cover in order to avoid interference with the inner wall surface of the side thruster tunnel and the inner wall surface of the side thruster tunnel When the gap between larger, since the a large gap or no lid portion further is provided between the inner wall surface of the peripheral portion of the side thruster lid and side thruster tunnel when closing the side thruster tunnel lid occurs, hull portion water and air in the side thruster tunnel and out flow through the gap between the inner wall surface of the side thruster tunnel cover and side thruster tunnel by pressure fluctuations of the wave, as a result, the flow of hull part of the ship for cruising Disturbance increases propulsion resistance. On the other hand, in the case where the main body of the side thruster tunnel cover and side thruster tunnel is formed by different metals, the smaller the gap between the side thruster tunnel lid and the inner wall surface of the side thruster tunnel, The potential difference between the side thruster tunnel lid and the inner wall of the side thruster tunnel makes corrosion between dissimilar metals more likely to occur.
For example, when a silver chloride electrode in seawater is used as a reference, the potential in the seawater of the side thruster tunnel lid or lid blade of a copper alloy material is about -250 mV, whereas the main body of the side thruster tunnel of an iron-based material is The potential in the seawater of the part is about -750 mV, and the potential difference between the side thruster tunnel lid or the lid blade and the inner wall surface of the side thruster tunnel is about 500 mV. If there is such a potential difference, corrosion between different metals occurs. State.

In view of the above-mentioned circumstances, the present invention closes the opening of the side thruster tunnel without any gap when the lid of the side thruster tunnel is closed, so that the water in the side thruster tunnel can be closed even if the external water pressure fluctuates due to waves. As a result, the water flow on the side of the ship is not disturbed, the propulsion resistance of the ship can be reduced, and the potential of the side thruster tunnel lid is reduced by the sacrificial electrode provided in the side thruster tunnel. by polarization, the potential difference between the side thruster tunnel lid and the inner wall surface of the side thruster tunnel can be suppressed to less potential corrosion potential difference, different metals between the side thruster tunnel lid and the inner wall surface of the side thruster tunnel such that it can be prevented during corrosion, and provides a marine side thruster tunnel cover
It is to try.

[0006]

In order to achieve the above-mentioned object, a ship side thruster tunnel cover according to the present invention is provided with a sieve.
The continuous opening on the outer skin surface around the opening of the
Ship side thruster that opens and closes the opening along the mouth
In the tunnel lid, the side thruster tunnel lid,
Multiple horizontal drives spaced vertically from each other
Use the same water to rotate around the axis of the horizontal drive shaft for each moving shaft.
It has a plurality of lid blades supported by a flat drive shaft.
When the lid blade rotates to the open position, the side thrust
The contour shape does not interfere with the inner wall of the channel.
Defined, and each of the above-mentioned lid blades rotates to the closed position
When doing so, the lid blade adjacent to each of the lid blades and the side
To prevent interference with the inner wall of the thruster tunnel
Due to the contour shape of the adjacent lid blade defined in
Inside the adjacent lid blade and the side thruster tunnel
It has a widened portion that covers the gap between it and the wall.
With no gap over the entire length between
Configured to close the opening of the side thruster tunnel
And each of the lid blades is
Electrically connected to the sacrificial electrode on the inner wall of the tunnel
Inside of each of the lid blades and the side thruster tunnel
The potential difference with the wall surface is always kept at 50 mV or less.
Is held.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. First, in FIG. 1, an opening surface continuous with the surface of the outer plate 1 around the opening of the side thruster tunnel 2 having a circular cross section penetrating the hull in the left-right direction is
Since the outer plate 1 is inclined in both the stern direction and the vertical direction of the hull, the actual front shape is substantially elliptical as shown in FIG. The side thruster tunnel lid, which is disposed along the opening surface of the side thruster tunnel 2 and opens and closes the opening of the side thruster tunnel 2, includes a plurality of horizontal drive shafts which are disposed at intervals in the vertical direction. Horizontal drive shafts 7, 8, 9 for each of 7, 8, 9 and 10
And a plurality of lid blades 3, 4, 5 and 6 supported by the respective horizontal drive shafts 7, 8, 9 and 10 so as to rotate around the axes of the horizontal and vertical axes. Each horizontal drive shaft 7,
8, 9 and 10 are torque transmission shafts 11 and 1 respectively.
When the horizontal drive shaft 7 is rotated via the torque transmission shaft 11 simultaneously, the cover blade 3 is connected to the horizontal drive shaft 7 via the torque transmission shaft 11. When the horizontal drive shaft 8 is rotated via the torque transmission shaft 12, the cover blade 4 is
When the horizontal drive shaft 9 is rotated via the torque transmission shaft 13, the cover blade 5 is rotated integrally with the horizontal drive shaft 9, and is horizontally rotated via the torque transmission shaft 14. Drive shaft 10
Is rotated, the cover blade 6 rotates integrally with the horizontal drive shaft 10. Thus, each lid blade 3, 4, 5 and 6
, As shown by the solid line in FIG. 1 and FIG. 2, the opening of the side thruster tunnel 2 from the closed position in the state of closing along the opening surface, as shown by a chain line in FIG. 2, the side thruster It rotates all at once to the open position where the opening of the tunnel 2 is open, and conversely, it rotates all at once from the open position to the closed position.

[0008] As shown in FIGS. 1 and 3, each lid wings 3, 4, 5 and 6, do not interfere with the inner wall surface of the side thruster tunnel 2 when rotated toward the open position The contour shape is determined as described above. When each of the lid blades 3, 4, 5, and 6 having such a contour is rotated from the open position to the closed position, interference between the lid blades 3, 4, 5, and 6 and the inner wall surface of the side thruster tunnel 2 is caused. Between the lid blades 3, 4, 5 and 6 and the inner wall surface of the side thruster tunnel 2 due to the contour shape of each of the lid blades 3, 4, 5 and 6 determined so as to prevent , Gap 3
a, 3b, 4c, 5d, 6e and 6f result. These gap portions 3a, 3b, 4c, 5d, 6e and 6f
The cover blades 4 and 5 have widened portions 4a, 4b, 4d, 5c, 5d, 5e, and 5c so that the cover blades 4, 4, 5 and 6 can be covered when the cover blades are turned to the closed position. 5f is formed so as to protrude in the width direction of the lid blades 4 and 5, so that when each of the lid blades 3, 4, 5 and 6 closes the opening of the side thruster tunnel 2, each Between the peripheral edge of the cover blades 3, 4, 5 and 6 and the inner wall surface of the side thruster tunnel 2, and between the cover blades 3, 4, 5 and 6
The side thruster tunnel 2 has a minimum gap between the lid blades 3, 4, 5 and 6 over the entire length of the tunnel.
Opening can be closed.

[0009] As shown in FIGS. 4 and 5, the scan inside
The lid blades 3, 4, 5, and 6 respectively disposed at the left and right openings of the side thruster tunnel 2 having the last generation propeller 23 are provided with sacrificial holes provided on the left and right inner wall surfaces of the side thruster tunnel 2, respectively. Electrodes 15, 1
8, 16 and 17 and conductive lines 19 , 20 and 2, respectively.
1 and 22 and the horizontal drive shafts 7, 8, 9 and 1
0, and are electrically connected to each other, and the potential difference between each of the lid blades 3, 4, 5, and 6 and the inner wall surface of the side thruster tunnel 2 can always prevent electrolytic corrosion between dissimilar metals. It is maintained at a potential difference of 50 mV or less within a possible range. Usually, while each of the cover blades 3, 4, 5, and 6 is made of a copper alloy material, the side thruster tunnel 2 is made of an iron material, and in this case, each of the sacrificial electrodes 15, 1
6, 17 and 18 are provided as sacrificial anodes. The capacity of the sacrificial anode for preventing the corrosion between dissimilar metals is determined in consideration of the water flow when the hull is running, so that the anticorrosion current density is, for example, 100%.
A capacity that can be about 0 mA / m ² can be used as a reference.

[0010]

As described above, according to the ship side thruster tunnel lid of the present invention, the side thruster tunnel
Along the opening that is continuous with the outer skin surface around the opening
In the side thruster tunnel lid for ships that opens and closes ,
The side thruster tunnel lids are vertically spaced from each other
The same horizontal drive axis for each of the multiple horizontal drive axes
Supported by the same horizontal drive shaft so as to rotate around the axis of
Cover blades, each of which is turned to the open position.
Interference with the inner wall of the side thruster tunnel when moving
The contour shape is determined so that it does not
When each of the lid blades is rotated to the closed position,
Inside the lid blade adjacent to the root and the side thruster tunnel
The above-mentioned adjacency specified to prevent interference with the wall
Due to the contour shape of the lid blade to be adjacent to the above-mentioned adjacent lid blade
Gap between the inner wall of the side thruster tunnel
It has a widened portion that covers the space between
The side thruster tunnel with no gap over the length
Is configured to close the opening of the
Each lid blade is located on the inner wall of the side thruster tunnel.
Is electrically connected to the sacrificial electrode of
Potential difference between the inner wall of the side thruster tunnel
Is always kept at a potential difference of 50 mV or less.
Side thrusters When the tunnel lid is closed, the side thrusters
The tunnel opening is closed with a minimum gap, and
Despite water pressure fluctuations, the side thruster tunnel
Low water and air flow, resulting in turbulent water flow on the side of the ship
Without reducing the propulsion resistance of the ship.
The sacrificial electrode provided in the side thruster tunnel
To polarize the potential of the side thruster tunnel lid,
Id thruster tunnel with side thruster tunnel
The potential difference between the electrodes can be suppressed to a potential difference
Come, side thruster tunnel lid and side thruster ton
Corrosion between dissimilar metals can be prevented.
Inside the id thruster tunnel lid and side thruster tunnel
Ensure that the potential difference between the wall and the
It can be suppressed to 50 mV or less, and the side thrust
Between the tunnel lid and the inner wall of the side thruster tunnel
Corrosion between metals of different types can be reliably prevented.
Item 1).

[Brief description of the drawings]

FIG. 1 is an overall front view of a ship side thruster tunnel lid according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional side view of the marine side thruster tunnel lid of FIG. 1, viewed along line EE of FIG. 1;

3 is a top view of each lid blade of the ship side thruster tunnel lid of FIG. 1, and FIG. 3 (a) shows the lid blade in an open position when viewed along the line AA of FIG. 1; Top view of the time,
(B) is a top view when the cover blade is at the open position when viewed along the line BB in FIG. 1, and (c) is a view taken along line C- in FIG. 1.
The top view when the lid blade is in the open position when viewed along the line C, and the (d) diagram is when the lid blade is in the open position when viewed along the line DD in FIG. It is a top view.

FIG. 4 is a cross-sectional view of the side thruster device having the side thruster tunnel lid of FIG. 1, as viewed along the line GG of FIG. 5;

FIG. 5 is a longitudinal sectional view of the side thruster device having the side thruster tunnel lid of FIG. 1 and is a view along line FF of FIG. 4;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Hull outer plate 2 Side thruster tunnel 3,4,5,6 Lid blade 3a, 3b, 4c, 5d, 6e, 6f Clearance part 4a, 4b, 4d, 5c, 5e, 5f Widening part 7,8,9, Reference Signs List 10 Horizontal drive shaft 11, 12, 13, 14 Torque transmission shaft 15, 16, 17, 18 Sacrificial electrode (sacrifice anode) 19, 20, 21, 22 Conductive wire 23 Propeller for thrust generation

Continuation of the front page (56) References JP-A-6-99886 (JP, A) JP-A-4-15189 (JP, A) JP-A-61-16196 (JP, A) JP-A-4-89551 (JP) , U) Japanese Patent Publication No. 1-15549 (JP, B2) Japanese Utility Model Publication 7-19998 (JP, Y2) Japanese Patent Publication No. 48-36812 (JP, B1) Japanese Patent Publication No. 63-12945 (JP, B2) (58) Field surveyed (Int. Cl. ⁶ , DB name) B63H 25/42 B63B 59/04 C23F 13/00

Claims (1)

(57) [Claims] 1. The periphery of an opening of a side thruster tunnel
A ship that opens and closes along an opening that is continuous with the outer panel surface
The side thruster for the marine side thruster tunnel lid
Star tunnel lids are spaced apart from each other in the vertical direction
Around the axis of the same horizontal drive axis
Plural sheets supported by the same horizontal drive shaft so as to rotate
It has lid blades, and each of the lid blades moves upward when pivoting to the open position.
Do not interfere with the inner wall of the side thruster tunnel.
The contour shape is determined as
When the blade is rotated to the closed position, it is adjacent to each of the lid blades
Between the lid blade and the inner wall of the side thruster tunnel
Of the adjacent lid blade specified to prevent interference
Due to the contour shape, the adjacent lid blade and the side
Covers the gap created between the inner wall of the raster tunnel
A widened portion having a gap with the adjacent lid blade over the entire length;
Between the side thruster tunnel openings
Each of the lid blades is configured to be closed and
Is the sacrificial electrode on the inner wall of the side thruster tunnel
Is electrically connected to each of the lid blades and the side
The potential difference between the inner wall of the thruster tunnel is always 50
characterized by being held at a potential difference of mV or less,
Side thruster tunnel lid for ships.