JPH07119449B2 - Biofouling prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is intended to prevent attachment of organisms such as a wing to a structure constructed in water such as an intake channel for a hydroelectric power plant. Biofouling prevention device.

[Conventional technology]

In general, the following five processes can be inferred as the process in which, for example, a flap adheres to the side surface of the intake channel near the intake.

Adults that stopped on the wall from the air are distributed along the wall along the wall and lay eggs.

Adults landing from the air swim or are washed away and reach the wall surface, and then spread along the wall to the underwater surface to lay eggs.

Adults landing from the air dive and swim in the water to reach arbitrary positions on the wall and lay eggs.

Adults landing in the air diving or reaching the wall surface by themselves or by being swept at a relatively shallow water depth and laying eggs.

After the larvae that hatched in the mountain stream in the upstream reach the stream and go down the river, they reach the wall surface of the canal and are distributed as they are.

Next, the adhesion process can be roughly classified into the following two forms.

A Adults, regardless of walking, swimming, or shedding, once reach the wall surface near the water surface and then distribute along the wall to lay eggs.

B adults freely dive in the water, and larvae attach to arbitrary positions on the wall surface while flowing through the water channel, and then lay eggs or grow. In addition, this form is the same for organisms such as insects other than Tobigera.

Moreover, the thickness of attachments such as toebilla is more than 10 cm, and the intake channel also extends for several km, resulting in water intake loss and reduction in power generation.

Therefore, conventionally, the attached organisms are removed by mechanical or human work.

[Problems to be Solved by the Invention]

Conventionally, since the adhered organisms are removed by mechanical and human work, there is a problem that enormous cost and time are required.

The present invention has been made in consideration of the above points, and an object of the present invention is to provide an organism attachment preventing device that prevents attachment of organisms such as a wing and is easy to handle and inexpensive.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, the biofouling prevention apparatus of the present invention has a structure in which a plurality of electrodes made of a metal such as a wire, a rod, or a strip or made of a good conductive material is attached to a flexible insulating sheet substantially in parallel. The sheet is attached to a water contact surface such as a side surface or a bottom surface of the sheet which contacts the water, and a voltage having alternating electrodes is applied to each electrode to form a film-like electric field on the entire surface of the sheet.

[Action]

The biofouling prevention device of the present invention configured as described above,
A plurality of electrodes are provided substantially parallel to each other on the water contact surface of the structure through a sheet, and a voltage having alternating poles is applied to each electrode,
Since the electric field is formed on the entire surface of the sheet, it is possible to prevent the attachment of the organisms according to the form B as well as the attachment of the organisms according to the form A, and do not electrically affect other organisms such as fish,
In addition, the sheet can be wound and spread together with each electrode, the handling is extremely easy, the configuration is simple and the cost is low.

〔Example〕

One embodiment will be described with reference to FIGS.

In these drawings, (1) is an intake for a hydroelectric power station formed at the foot of the mountain, (2) is an intake channel for introducing water with a substantially U-shaped cross section that communicates with the intake (1), and (3) is intake. Road (2)
The structure (4) formed with is a water contact surface such as a side surface (5) and a bottom surface (6) of the structure (3) which are in contact with water, and is a barrier formation region.

(7) is a flexible insulating sheet, (8) is a linear, rod-shaped, strip-shaped electrode or the like, and is made of copper or the like, and a plurality of electrodes (8) are parallel to the sheet (7) at substantially equal intervals. Installed. (9) is a suture for fixing the electrode (8) to the sheet (7).

(10) is a DC power supply, and both ends of the power supply (9) are connected to each electrode (8) by a flexible cord (11) shown in Fig. 2 so that the electrodes (8) arranged in parallel have alternating poles. Has been done.

When forming a barrier on the water contact surface (4) of the structure (3), for example, as shown in FIG. 3, one side of the sheet (7) is attached to the structure (3) to the concrete nail (12). The wound sheet (7) is spread along the water contact surface (4), nails (12) are hit in places to fix the entire surface of the sheet (7), and the power source (10) connects each electrode. Energize (9).

Next, when removing the sheet (7), the sheet (7) is wound from one side of the sheet (7) while pulling out the nails (12) contrary to the above, and removed.

The sheet (7) does not necessarily have to be laid on the entire surface of the water contact surface (4) as shown in the figure, and it is needless to say that the sheet (7) may be provided only on a required portion.

〔The invention's effect〕

Since the present invention is configured as described above, it has the effects described below.

A plurality of electrodes (8) are provided substantially parallel to the water contact surface (4) of the structure (3) via a sheet (7), and each electrode (8)
Since a voltage which is a mutual pole is applied to the sheet (7) and an electric field is formed over the entire surface of the sheet (7), the attachment of organisms can be prevented, the organisms such as other fish are not electrically affected, and each electrode is The sheet (7) can be wound and stretched together with (8), is extremely easy to handle, has a simple structure, and is inexpensive.

[Brief description of drawings]

The drawings show one embodiment of the biofouling prevention apparatus of the present invention. Fig. 1 is a partially cutaway perspective view, Fig. 2 is a developed view of a part of the seat, and Fig. 3 shows a laying process of the seat. It is a front view. (3) …… Structure, (4) …… Water contact surface, (5) …… Side surface, (6) …… Bottom surface, (7) …… Insulating sheet, (8)
……electrode.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mamoru Abe 3-3-22 Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture Kansai Electric Power Co., Inc. (72) Hidehiko Maebata 1-6-14 Edobori, Nishi-ku, Osaka City, Osaka Prefecture No. Hitachi Shipbuilding Co., Ltd. (72) Inventor Hironari Arai 1-6-14 Edobori, Nishi-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd. (72) Hiroyuki Carpenter 1-6-14 Edobori, Nishi-ku, Osaka City, Osaka, Hitachi Shipbuilding Co., Ltd. (72) Inventor Masanori Tsukahara 1-6-14 Edobori, Nishi-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd. (72) Seiji Otani 1-6-14 Edobori, Nishi-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd. In-house (56) References Japanese Patent Publication Sho 62-33366 (JP, B2)

Claims (1)

[Claims] 1. A flexible insulating sheet having a plurality of electrodes made of a metal, such as a wire, a rod, or a strip, or a material having good conductivity, mounted substantially parallel to each other, and having water contact on the side surface, bottom surface, etc. of the structure. A biofouling prevention device in which the sheet is attached to a surface, and a voltage that serves as an alternate electrode is applied to each electrode to form a film-like electric field on the entire surface of the sheet.