JPH06107276A - Self-antifouling type seawater suction grid - Google Patents

Abstract

PURPOSE:To electrolyze seawater so as to prevent adhesion of marine ordganism without causing any seawater pollution by providing a seawater suction grid which is formed from a non-metallic conductive resin material and has conductivity on its outer face, setting the grid to a positive electrode, and energizing between it and a negative plate which is provided on a ship body side. CONSTITUTION:In equipment in which large quantity of outer seawater is taken in from a seawater intake provided in a ship and the like and is used for cooling water of a heat exchanger or ballast water, a seawater suction grid 1 which has attachment legs 2 and reinforcing members 3 and composed of conductive non-metallic member is attached to the seawater intake. The seawater suction grid 1 is set to a positive electrode, seawater suction section side where the grid is installed is set to a negative electrode, a negative plate 5 is provided around the circumference of the grid 1, and the grid 1 is energized from a direct-current supply source 8 via a controller 9 according to seasonal conditions of sea areas and increase/decrese of plankton so as to electrolyze seawater. The electrolysis generates hypochlorite ion so as to prevent adhesion of marine organism.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-fouling seawater inhalation grid for ships and the like.

[0002]

2. Description of the Related Art In a ship, a large amount of external seawater is introduced into the ship as cooling water for a heat exchanger and as ballast water through a seawater intake port. This type of seawater intake has a grid as shown in the partial cross-sectional view of FIG. 4 and the front view of FIG. Marine organisms such as seaweed shells attach to the seawater, which hinders the entry and exit of seawater.
It is necessary to regularly dock and remove these attached organisms, and the removal work requires a considerable amount of labor. Further, since the seawater inhalation grid is corroded by attached marine organisms, it has conventionally been necessary to apply a regular coating for corrosion prevention and antifouling, and this work also requires a considerable amount of labor.

[0003]

By the way, the paint having a high antifouling property used for painting has a high pollution property, and the antifouling property deteriorates with the passage of time. Further, since the inhalation grid is made of steel, it is heavy and difficult to handle.

The present invention has been proposed in view of the above circumstances, and prevents marine organisms from adhering without causing seawater pollution, reduces seawater inhalation resistance, and removes adhering organisms.
It is an object of the present invention to provide a long-life and lightweight antifouling seawater inhalation grate designed to save labor in coating work and prevent corrosion.

[0005]

To this end, the invention according to claim 1 provides a seawater suction grid, which is made of a non-metallic conductive resin material and has conductivity on its outer surface, a cathode plate provided on the hull side, and It is characterized in that it has a seawater suction grid as an anode, and a power source for electrolyzing seawater by energizing it with the cathode plate.

According to a second aspect of the present invention, in the first aspect of the invention, a direct current power source that uses natural energy such as solar heat, wind power, and wave power is selected as a power source, and continuous operation and intermittent operation are selected.
And a controller for controlling the output voltage and current value.

[0007]

Operation: Electricity is applied between the lattice main body and the opening of the hull to electrolyze seawater and generate hypochlorite ions on the surface of the lattice main body to prevent the adhesion of marine organisms. In addition, a direct current source that uses natural energy such as solar heat, wind power, and wave power is adopted as the power source, and continuous operation, intermittent operation selection, and output voltage / current value control enable power saving and effect depending on the season and sea area. The seawater inhalation grid can be effectively prevented.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a partial cross-sectional view of a ship equipped with the present invention, FIG. 2 is a front view showing the seawater intake grid and cathode arrangement of FIG. FIG. 3 is a partially enlarged view showing a bolt joint portion between the seawater suction grid and the hull of the portion III in FIG. 1.

In the above figure, the seawater intake grid 1 is composed of a mounting leg 2 and a reinforcing material 3, and is made of a conductive non-metallic material. Now, the seawater intake grid 1 is used as an anode, the seawater intake compartment side where the grid 1 is mounted is used as a cathode, and a cathode plate 5 is provided around the grid mounted, and a grid 8 is supplied from a power source 8 via a controller 9. Electricity is applied to the seawater to generate hypochlorite ions by electrolysis of seawater to prevent the attachment of organisms. Here, the seawater intake grid 1 is attached to a predetermined position of the seawater intake section of the hull portion by means of mounting bolts and nuts 4 via an insulating plate 6.

According to this structure, a direct current power source using natural energy is used as the power source 8 and the control device 9 is used.
This makes it possible to prevent the seawater inhalation grid from being soiled in a power-saving and effective manner according to the season of the sea area.

[0011]

According to such a seawater intake grid, the following effects can be obtained. (1) The hypochlorite ion prevents marine organisms from adhering and keeps the water supply resistance to a minimum. (2) Since it is a resin material, it has a weight of about ⅕ as compared with a metallic material and is not corrosive. (3) There is no fear of causing seawater pollution. (4) Cleaning of each dock is unnecessary. (5) The energization can be controlled according to the increase / decrease in the plankton in the sea depending on the sea area, water temperature, season, etc. It can operate in energy saving.

In short, according to the first aspect of the invention, the seawater suction grid made of a non-metallic conductive resin material and having conductivity on the outer surface, the cathode plate provided on the hull side, and the seawater suction grid as an anode. , Equipped with a power source to electrolyze seawater by energizing between it and the cathode plate, prevents the adhesion of marine organisms without causing seawater pollution, reduces seawater inhalation resistance, and removes adhered organisms, painting The present invention is extremely useful industrially because a long-life and lightweight antifouling seawater inhalation grid for labor saving and corrosion prevention is obtained.

According to the invention of claim 2, in the invention of claim 1, as a power source, a DC power source utilizing natural energy such as solar heat, wind power, wave power, and selection of continuous operation and intermittent operation,
Equipped with a control device for output voltage and current value, prevents marine organisms from adhering without causing seawater pollution, reduces seawater inhalation resistance, and reduces labor for adhering organisms, reduces labor in painting work, and prevents corrosion. The present invention is extremely useful industrially because it is possible to operate the seawater intake grid in addition to the long-life and lightweight antifouling seawater intake grid in a power-saving manner.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a hull showing an embodiment of the present invention.

FIG. 2 is a front view showing the arrangement of the seawater suction grid and the cathode of FIG.

FIG. 3 is a partial enlarged view showing a bolt connection portion between a seawater suction grid and a hull of a portion III in FIG. 1.

FIG. 4 is a partial cross-sectional view of a hull showing a seawater intake port of a conventional ship.

5 is a front view taken along line VV of FIG.

[Explanation of symbols]

 1 Seawater Intake Lattice 2 Mounting Leg 3 Reinforcing Material 4 Mounting Bolt Nut 5 Cathode Plate 6 Insulating Plate 7 Seawater Intake Pipe 8 Power Supply 9 Control Device

Claims (2)

[Claims] 1. A seawater suction grid formed of a non-metallic conductive resin material and having conductivity on the outer surface, a cathode plate provided on the hull side, and the seawater suction grid serving as an anode between the cathode plate and the cathode plate. A self-fouling seawater inhalation grid, which is equipped with a power source for energizing and electrolyzing seawater. 2. The invention according to claim 1, further comprising a direct-current power source that uses natural energy such as solar heat, wind power, and wave power as a power source, and a control device for selecting continuous operation or intermittent operation and an output voltage / current value. A self-fouling seawater inhalation grid characterized by.