JP5094275B2 - Sea chest - Google Patents

Description

  The present invention relates to a sea chest, and more particularly to a sea chest installed on the bottom of a high-speed ship.

2. Description of the Related Art Conventionally, when a ship navigates, a sea chest provided in the ship to take in the necessary seawater corresponds to an opening formed in the bottom of the ship and a box body that surrounds the opening (a hollow that has entered the hull. ) And water intake means (water intake pipe, water intake pump, etc.) for entering the box and pumping up seawater. Further, there is a form in which a punching metal or the like for eliminating the inflow of dust is installed in the opening.
And in the form where punching metal etc. is not installed, when the ship speed becomes high and the flow of seawater in the opening becomes high, seawater flows excessively into the box body, on the contrary, in the form where punching metal etc. is installed There was a problem that the inflow of seawater into the box was insufficient (same as the internal pressure of the box being lowered).
Therefore, in order to solve such a problem, the inventors of the present invention have developed a high-speed ship sea chest in which a plurality of columns are arranged in a fence shape in the opening so that the center axis is parallel to the ship width direction. (For example, refer to Patent Document 1).

JP 2002-166875 A (page 3, FIG. 1)

  However, the invention described in Patent Document 1 can effectively induce the flow of seawater in the box using the ship speed of a high-speed ship without causing a drop in ship speed or a drop in internal pressure in the box. Therefore, although it has a remarkable effect of being able to take in an appropriate amount of seawater during navigation, a new piece of tree, twig, fallen leaf, etc. (in the present invention, “ A device was sought to prevent them from being sucked into the box.

  The present invention has been made in order to meet the above requirements, and can take in seawater without adversely affecting the propulsion performance during high-speed navigation, and prevent the inhalation of garbage during mooring (berthing). The purpose is to provide a sea chest that can be used.

(1) A sea chest according to the present invention includes an opening provided in a ship bottom and a plurality of lattice members arranged in the opening with a central axis parallel to the ship width direction and a gap having a predetermined width. And a plate member having a water passage hole and closing the gap,
The lowermost part of the lattice member is disposed so as to be substantially flush with the lower surface of the ship bottom, and the plate member is disposed so as to be located above the lower surface of the ship bottom ,
The lattice member is a column or a cylinder .

(2) In addition, an opening provided in the ship bottom, a plurality of lattice members arranged in the opening with a central axis parallel to the ship width direction and having a predetermined width, and a water passage hole And having a plate member that closes the gap,
The lowermost part of the lattice member is disposed so as to be substantially flush with the lower surface of the ship bottom, and the plate member is disposed so as to be located above the lower surface of the ship bottom,
The lattice member includes a plane substantially perpendicular to the bottom surface of the bottom of the ship on the bow side, and a curved surface or an inclined plane that moves away from the bottom of the ship toward the stern on the stern side.

( 3 ) Further , an opening provided on the bottom of the ship, a plurality of lattice members arranged in the opening with a center axis parallel to the ship width direction and a gap of a predetermined width, and a water passage hole are provided. And having a plate member that closes the gap,
The lowermost part of the lattice member is disposed so as to be substantially flush with the lower surface of the ship bottom, and the plate member is disposed so as to be located above the lower surface of the ship bottom,
As the lattice member is inclined upwards by 5 to 20 degrees with respect to a plane substantially perpendicular to the bottom surface of the bottom of the ship, the plane that approaches the stern increases toward the bow side, and as the stern approaches, the plane moves away from the bottom of the ship. A curved surface or an inclined plane is provided on the stern side, respectively.

( 4 ) In the above ( 2 ) or ( 3 ), the curved surface is a circular arc in cross section.

( 5 ) In any one of the above ( 1 ) to ( 4 ), the plate member is inclined so as to approach the bottom of the ship as it becomes the stern.

( 6 ) In any one of ( 1 ) to ( 5 ), the plate member is any one of a punching metal, an expanded metal, and a metal net.

Since the sea chest according to the present invention has the above configuration, the following effects can be obtained.
(I) Since the sea chest according to the present invention includes a plurality of lattice members arranged in the opening with a gap having a predetermined width and a plate member having a water passage hole that closes the gap, Since it cannot pass through the water passage hole, dust does not enter the box during berthing.
Further, since the plate member that closes the gap is positioned above the lattice member, a recess (dent) sandwiched between the lattice members is formed in the lower portion of the plate member. For this reason, when navigating, a flow of seawater entering the recess is formed on the stern side of the lattice member, and the seawater stably flows into the box through the water passage holes formed in the plate member.
In addition, since the lowermost part of the lattice member is positioned so as to be substantially flush with the lower surface of the ship bottom, and the lattice member does not protrude downward from the lower surface of the ship bottom, the flow of seawater along the lower surface of the ship bottom There is no direct collision with the bow side surface, and the propulsion performance of the ship is not significantly reduced.

  (Ii) Since the lattice member is a column or cylinder, the flow of seawater formed on the stern side of the lattice member is smooth and less disturbed during navigation, and the inflow of seawater into the box is stabilized. Moreover, since the seawater that flows into the recess once and then returns to the seawater flow along the bottom surface of the ship bottom flows along the bow side surface of the lattice member, it becomes a smooth flow with less turbulence, and the propulsion performance of the ship is further improved. There is no significant drop. Furthermore, since the lattice member can be manufactured at a low cost with a simple shape, the manufacturing cost and maintenance cost of the sea chest can be reduced.

(Iii) Since the stern side of the lattice member is a curved surface or an inclined plane that moves away from the bottom as it approaches the stern, and the bow side of the lattice member is a plane that is substantially perpendicular to the bottom surface of the ship bottom, In addition, the flow of seawater entering the recess formed on the stern side of the lattice member is directed obliquely upward along the stern side surface of the lattice member, and further collides with the bow side surface of the lattice member and moves upward. Because it goes, seawater tends to flow into the box.

(Iv) the bow side of the grid member, since a plane approaches the stern enough to become upwardly inclined obliquely with respect to the ship's bottom of the lower surface, during sailing, entering the recess formed in the stern side of the grid member The seawater flows obliquely upward along the stern side surface of the lattice member, and further obliquely collides with the bow side surface of the lattice member and heads obliquely upward, so that seawater easily flows into the box. ing. Further, even when the flow of seawater along the bottom surface of the ship bottom collides with the lower edge portion of the bow side surface of the lattice member, the seawater flow is guided obliquely upward along the bow side surface of the lattice member. Therefore, the turbulent flow and separation due to the collision are suppressed to the minimum, a large decrease in the propulsion performance of the ship is prevented, and cavitation is difficult to occur.

  (V) Since the curved surface has a cross-sectional arc, the manufacturing is easy and the manufacturing cost can be reduced. Accordingly, the lattice member is formed into a sector-shaped column having a cylinder vertically divided, for example, a 1/4 cylinder having an opening angle of 90 degrees or a 1/6 cylinder having an opening angle of 60 degrees. can do.

  (Vi) Since the plate member is inclined so as to be closer to the bottom of the stern, the flow of seawater entering the recess formed on the stern side of the lattice member easily passes through the water passage hole formed in the plate member. The seawater flows into the box more stably.

  (Vii) Since the plate member is any one of a punching metal, an expanded metal, and a metal net, it is possible to prevent the intrusion of dust and to allow seawater to flow into the box with a small passage resistance. . Further, since it is inexpensive, it is possible to reduce the manufacturing cost of the sea chest.

[Embodiment 1]
1 to 4 illustrate a sea chest according to Embodiment 1 of the present invention. FIG. 1 is a rear view (the right side is the bow side, the left side is the stern side), and FIG. 2 is a cross-sectional view in side view. (A-A cross section in FIG. 1), FIG. 3 is a partial cross-sectional view showing a part of FIG. 2 in an enlarged manner, and FIG. 4 is a partial cross-sectional view in a front view showing a part in an enlarged manner (BB in FIG. 1). Cross section). In addition, in each figure, since each member is typically shown, the quantity, dimension, etc. are not limited to what was illustrated. Moreover, the same code | symbol is attached | subjected to the same part, respectively.

(Sea Chest)
1 to 4, the sea chest 1 communicates with an opening 12 formed in a bottom 11 of a ship 10, a box 13 surrounding the opening 12 and installed on the inner side of the hull, and the box 13. A water intake pipe 14 provided with a water intake pump (not shown), lattice members 20a, 20b, 20c, 20d disposed in the opening 12, and water holes 31a, 31b disposed in the opening 12, respectively. And plate members 30a, 30b, 30c and 30d in which 31c and 31d are formed (formed).
In addition, when explaining the common contents, the description of the subscripts “a, b, c, d” is omitted, or individually or all of them are collectively “lattice member 20” or “plate member 30”, It may be referred to as “water passage hole 31”.
Note that the bottom 11 is not limited to be horizontal (parallel to the water line (not shown)). For example, when the openings 12 are formed on the left and right sides of the substantially V-shaped bottom, the bottom of the ship 11 is inclined.

(Mounting piece)
The lattice member 20 and the plate member 30 are installed on a common attachment piece 40. The attachment piece 40 includes a lattice frame portion 41 having a rectangular cross section, a flange portion 42 projecting outward from the lower end of the lattice frame portion 41, and an attachment through hole 43 formed in the flange portion 42. .
The attachment piece 40 is detachably installed in the opening 12 so that the lower surface of the flange portion 42 is positioned on the same surface as the lower surface of the ship bottom 11.

(Lattice member)
Each of the lattice members 20a, 20b, 20c, and 20d is fixed to the lattice frame portion 41 of the mounting piece 40 with a center axis parallel to the ship width direction with a gap of a predetermined width to form a lattice (fence, ladder). is doing.
The lattice member 20 has a columnar shape (or a hollow cylindrical shape) having a uniform cross-sectional shape in the axial direction, and is on the bow side with respect to the lower surface of the ship bottom 11 (for example, substantially perpendicular to the lower surface of the ship bottom 11). The bow side plane 21 (in the range of position a-b) in FIG. 3 and the lower edge 22 of the bow side plane 21 (FIG. 3) In FIG. 3, the stern side arc surface 23 (in the range of the position locator position c in FIG. 3) and the upper edge of the arc surface 23 are connected to the upper edge of the arc surface 23. The hull side plane 25 connecting the stern side plane 24 substantially parallel to the bow side plane 21 (in the range of the position h in FIG. 3) and the upper edge of the stern side plane 24 and the upper edge of the bow side plane 21. (Range of position knee position a in FIG. 3).
The lower edge 22 is located on the lower surface of the flange portion 42 of the mounting piece 40, that is, on the same surface as the lower surface of the ship bottom 11.
The circular arc surface 23 is not limited to one having a single radius of curvature (corresponding to a part of a single circle), but a range in which a plurality of radiuses of curvature are connected, or a wing shape. It may be a part.

(Plate member)
Each of the plate members 30a, 30b, 30c, and 30d is a plate material in which a plurality of water passage holes 31a, 31b, 31c, and 31d are formed (drilled) in a zigzag shape, and are inclined so as to approach the bottom of the ship toward the stern. And fixed to the lattice frame portion 41 of the mounting piece 40.
Moreover, the edge part of the bow side of the board member 30 is fixed to the stern side plane 24 (position e in FIG. 3) of the lattice member 20 arrange | positioned at the bow side, and the edge part of the board member 30 on the stern side is The lattice member 20 disposed on the stern side is fixed to the bow side plane 21 (position in FIG. 3).

Therefore, the inner range of the lattice frame portion 41 of the attachment piece 40 is covered with the lattice member 20 and the plate member 30 connected to each other. That is, in the opening 12 of the ship bottom 11, a concave portion 50 (a range formed by the position h, position h, position h, position h, position b in FIG. 3) is recessed from the lower surface of the ship bottom 11 on the stern side of the lattice member 20. ) Is formed, and the opening 12 is closed so as not to pass water except for the water passage hole 31 (not open except for the water passage hole 31).
In addition, although the above has shown the board | plate material in which the water hole 31 was pierced by the board | plate member 30, this invention is not limited to this, It is an expanded metal, a metal net, etc. which comprise a predetermined opening. May be.

(Seawater flow)
As described above, since the recessed portion 50 is formed in the opening 12 of the ship bottom 11, the flow of seawater along the bottom surface of the ship bottom flows into the recessed portion 50 and further passes through the water passage hole 31. It flows into the box 13 (schematically indicated by arrows in FIG. 2). At this time, since the stern side of the lattice member 20 is the circular arc surface 23, the occurrence of disturbance of the flow of the flowing seawater is suppressed, and the inflow into the box is stable. Furthermore, since the seawater that once flows into the recess 50 and returns to the flow of seawater along the lower surface of the ship bottom 11 flows along the bow side plane 21 of the lattice member 20, it is a smooth flow with little disturbance. Therefore, the propulsion performance of the ship 10 does not decrease.

  If the plate member 30 is arranged so as to be flush with the bottom surface of the ship bottom 11, the concave portion 50 is not formed, so that the flow of seawater along the bottom surface of the ship bottom 11 passes particularly during high-speed navigation. As a result, the amount of water flowing into the water hole 31 is reduced, resulting in a shortage of inflow of seawater into the box 13 and a decrease in pressure (an increase in the load of the water intake pump).

(Invasion prevention of garbage)
As described above, since the opening 12 is closed except for the water passage hole 31, dust can be prevented from entering the box 13. In particular, if there is rainfall upstream of the river, a large amount of fine garbage (small pieces of wood, twigs, leaves, etc.) flows, so if you are moored at a port near the mouth of the river, However, such a suction is prevented by the plate member 30. Therefore, it is not necessary to clean the seawater strainer (not shown), and it is freed from complicated work.

The bow side plane 21 of the grid member 20 is curved, a horizontal portion having a predetermined length is provided on the lower edge 22 of the grid member 20, or an arc range (chamfered chamfer) is formed at the connecting portion between the bow side plane 21 and the lower edge 22. ) May be provided. At this time, since the separation phenomenon of the seawater flow is suppressed at the lower edge 22, the propulsion resistance is prevented from increasing and cavitation is prevented from occurring.
Further, the stern side edge of the plate member 30 may be connected to the lower edge 22 of the bow side plane 21. At this time, the seawater that once flows into the recess 50 and then returns to the seawater flow along the bottom surface of the ship bottom 11 is not disturbed at the lower edge 22 (disturbance is minimized), thereby preventing a decrease in the propulsion performance of the ship. It will be.

[Other forms]
FIG. 5 is an enlarged partial cross-sectional view showing a part of a sea chest according to another embodiment of the present invention. In addition, in each figure, since each member is typically shown, the quantity, dimension, etc. are not limited to what was illustrated. In addition, the same reference numerals are given to the same or corresponding parts in the first embodiment (FIGS. 1 to 4).
In FIG. 5 (a), the lattice member 20 is formed into a cross-sectional sectoral column (a quarter cylinder having a sectoral opening angle of 90 degrees) in which the cylinders are divided vertically to reduce the manufacturing cost. At this time, instead of the solid pillar, a hollow body made of a plate material (one piece or a plurality of pieces joined to each other) formed so that the outer periphery has the shape may be used.
In FIG. 5 (b), the lattice member 20 is formed into a cross-sectional sectoral column (a quarter cylinder with a fan-shaped opening angle of 90 degrees) obtained by dividing a cylinder vertically, and a bow-side plane (same as a radial surface) 21 Is perpendicular to the lower surface of the flange portion 42 of the lattice frame portion 41 (same as the lower surface of the ship bottom 11).
In FIG. 5C, the stern side edge of the plate member 30 is installed on the lower edge 22 of the lattice member 20. Therefore, when part of the seawater that has flowed into the recess 50 returns from the recess 50 to a flow parallel to the bottom surface of the bottom 11, there is no turbulence in the bow side plane 21. Generation prevention is aimed at.
In FIG. 5D, the lattice member 20 is a cylinder. Therefore, the rigidity of the member covering the opening 12 is improved and the manufacturing cost is reduced. A cylinder may be used instead of the column.

  Since the present invention has the above-described configuration, seawater is properly taken in even during high-speed navigation, and intrusion of garbage is prevented during mooring. Therefore, the present invention can be widely used as a sea chest for various ships as well as high-speed ships. Can do.

The rear view explaining the sea chest concerning Embodiment 1 of the present invention. Sectional drawing of the side view explaining the sea chest which concerns on Embodiment 1 of this invention. The fragmentary sectional view which expands and shows a part of FIG. Sectional drawing of the front view explaining the sea chest based on Embodiment 1 of this invention. The fragmentary sectional view of the side view which expands and shows a part explaining sea chest concerning other embodiments of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sea chest 10 Ship 11 Ship bottom 12 Opening 13 Box 14 Water intake pipe 20 Lattice member 21 Bow side plane 22 Lower edge 23 Arc surface 24 Stern side plane 25 Hull side plane 30 Plate member 31 Water hole 40 Mounting piece 41 Grid frame Part 42 Flange part 43 Mounting through hole 50 Recessed part

Claims (6)

An opening provided in the ship bottom, a plurality of lattice members disposed in the opening with a center axis parallel to the ship width direction, with a gap having a predetermined width, and water passage holes, the gap And a plate member for closing
The lowermost part of the lattice member is disposed so as to be substantially flush with the lower surface of the ship bottom, and the plate member is disposed so as to be located above the lower surface of the ship bottom ,
The sea chest , wherein the lattice member is a column or a cylinder . An opening provided in the ship bottom, a plurality of lattice members disposed in the opening with a center axis parallel to the ship width direction, with a gap having a predetermined width, and water passage holes, the gap And a plate member for closing
The lowermost part of the lattice member is disposed so as to be substantially flush with the lower surface of the ship bottom, and the plate member is disposed so as to be located above the lower surface of the ship bottom ,
The sea chest is characterized in that the lattice member includes a plane substantially perpendicular to the bottom surface of the bottom of the ship on the bow side and a curved surface or an inclined plane that moves away from the bottom of the ship toward the stern on the stern side . An opening provided in the ship bottom, a plurality of lattice members disposed in the opening with a center axis parallel to the ship width direction, with a gap having a predetermined width, and water passage holes, the gap And a plate member for closing
The lowermost part of the lattice member is disposed so as to be substantially flush with the lower surface of the ship bottom, and the plate member is disposed so as to be located above the lower surface of the ship bottom ,
As the lattice member is inclined upwards by 5 to 20 degrees with respect to a plane substantially perpendicular to the bottom surface of the bottom of the ship, the plane that approaches the stern increases toward the bow side, and as the stern approaches, the plane moves away from the bottom of the ship. A sea chest comprising a curved surface or an inclined plane on the stern side, respectively. Sea chest according to claim 2 or 3, wherein said curved surface is arcuate sectional. The sea chest according to any one of claims 1 to 4 , wherein the plate member is inclined so as to approach the bottom of the ship as the stern becomes closer. The sea chest according to any one of claims 1 to 5 , wherein the plate member is any one of a punching metal, an expanded metal, and a metal net.

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