JPH0622416B2 - Electric screen generation method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electric screen generating method for generating an electric screen for regulating swimming of seafood in water.

[Conventional technology]

Conventionally, when this kind of electric screen is generated, a plurality of conductive rods in the vertical direction are arranged at equal intervals, and electrodes are formed by electrically connecting the conductive rods. A plurality of electrodes are arranged in parallel with each other in water so that different potentials are applied to the respective electrodes.

Therefore, an electric field having an electric field strength based on the potential difference, that is, an electric screen is formed between the electrodes in water.

When seafood tries to enter such an electric screen, the seafood receives an electrical stimulus and takes a repellent action, cannot pass through the electric screen, and can block the swimming of the seafood. .

[Problems to be Solved by the Invention]

By the way, when the above-mentioned electric screen is put into practical use, it is desired to form one that does not hinder the navigation of a ship or one that is closer to an intangible barrier. In such a case, the distance between the electrodes for generating the electric screen should be reduced. It is necessary to reduce the number of conductive rods that make up the electrodes.

However, when the distance between the electrodes is increased and the number of conductive rods is reduced, the electric field strength near the center of the forming electric field becomes weaker than other portions of the electric field due to the electric field concentration near the electrodes (conductive rods). There is inconvenience.

FIG. 3 shows an equipotential distribution and A when a different potential is applied to a pair of rod-shaped electrodes (1), (1) arranged in water by a DC power source (2) having a power source voltage V _P , respectively. It shows the characteristics of the potential V and the electric field strength E on the -A 'line.

As is clear from the figure, since electric field concentration occurs near both electrodes (1) and (1), the electric field strength E near the center between both electrodes (1) and (1) is much higher than the surroundings. It is becoming weak.

As a result, when seafood swims in the vicinity of the center between the electrodes (1) and (1), it easily passes through the electric screen due to weak electric shock stimulation.

Here, in order to surely block the swimming of seafood, both electrodes are
It is conceivable to increase the voltage applied between (1) and (1) to increase the electric field strength near the center, but in this case, the power source (2) becomes large and inconvenient.

The present invention has been made in view of such problems of the conventional technique, and the purpose thereof is to
An object of the present invention is to provide an invented method of an electric screen capable of reliably blocking swimming of seafood even if the distance between the pair of electrodes is increased and the voltage applied between the electrodes is relatively low.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, an electric screen generating method of the present invention provides a pair of electrodes arranged in parallel in water with different electric potentials to form an electric field between the electrodes, and between the electrodes. An air pipe is installed at the bottom of the water, air bubbles are ejected from a large number of air holes penetrating the air pipe, and air bubbles are mixed into the electric field between the electrodes to generate an electric screen for controlling the swimming of seafood. It is characterized by doing.

[Action]

Then, bubbles are generated in the electric field between both electrodes (1) and (1) in water.
When (3), ... are mixed, the electric potential is concentrated around the air bubbles (3), ... because the air bubbles (3) ,.
The gradient of the underwater electric potential V between the bubbles (3), ... Is larger than that in the absence of the bubbles (3) ,. The electric field strength E in the water between the bubbles (3) ,. It will be much stronger than if not.

Therefore, when seafood tried to pass near the center between both electrodes (1) and (1), the electric shock was weak when air bubbles (3), ... When air bubbles (3), ... are mixed under the same or low applied voltage as this, strong electrical stimulation between the air bubbles (3), ... is generated, which is caused even in a part of seafood. However, the seafood takes a repellent action and cannot pass through the electric screen.

〔Example〕

 Next, an embodiment of the present invention will be described with reference to FIG.

In this embodiment, for example, when constructing a fishing moat facility in the sea, lake, river, etc., a projecting part (4) surrounding part or all of the fishing moat.
An electric screen is formed in the water passage (5) provided in the.

The three vertical conductive rods (6) are arranged at equal intervals on both sides of the water passage of the water passage (5), and the electrically conductive rods (6) are electrically connected to form an electrode array (7). A pair of electrode rows (7), (7) are arranged adjacent to the protrusions (4) on both sides of the water passage (5), and both electrode rows (7), (7) are parallel to each other. opposite.

Different electric potentials are applied to the two electrode rows (7) and (7) by the DC power source (8), and an electric field is formed between the two electrode rows (7) and (7).

At the bottom of the water passage (5), a plurality of air holes (9) are provided, and two air pipes (10) are formed long in a direction orthogonal to the water passage direction of the water passage (5). Has been done.

Each of the air pipes (10) has one end sealed and the other end communicated with the air compressor (11) via the air tank (12) and the air hose (13). The air sent from (11) is the air holes (9) of both air pipes (10).
As a result, air bubbles are ejected and air bubbles (14), ... Are mixed in the electric field between the electrode arrays (7), and an electric screen for regulating swimming of seafood is formed.

Therefore, even if the distance between both electrode rows (7) and (7) is increased and the applied voltage between both electrode rows (7) and (7) is relatively small, the bubbles (14), ... It is possible to reliably block the passage of seafood to the water passage (5) by the electric screen mixed with.

Moreover, since the bubbles (14), ... Are continuously supplied to the water passage (5), a visual threatening effect can be expected, and swimming regulation of seafood is effectively realized.

In the above embodiment, the electric field strength between the electrode rows (7) can be increased by making the air gaps (9) in the air pipe (10) denser in the central portion and sparser toward both sides. More air bubbles (14), ... Can be mixed in the vicinity of the weak center of the sea, which enhances the swimming regulation effect of seafood.

〔The invention's effect〕

As described above, according to the electric screen generating method of the present invention, bubbles are mixed in the electric field formed between the pair of electrodes in water to generate the electric screen. Can be made stronger, the distance between the pair of electrodes can be increased, and even if the applied voltage between the pair of electrodes is relatively small, an electric screen with a strong electric field strength can be obtained, and swimming of seafood can be ensured. You can cut off,
The visual threatening effect of bubbles can also be expected.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of an equipotential distribution and an underwater potential characteristic and an electric field strength characteristic of an electric screen formed by the electric screen generating method of the present invention, and FIG. FIG. 3 is a perspective view of one embodiment, and FIG. 3 is an explanatory view corresponding to FIG. 1 of an electric screen formed by a conventional electric screen generating method. (1) …… electrode, (3), (14) …… bubble, (7) …… electrode array.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Hiroyuki Suyama Inventor Hiroyuki Suyama 1-6-14 Edobori, Nishi-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd. (72) Masanori Tsukahara 1-1-6 Edobori, Nishi-ku, Osaka City, Osaka Inside Hitachi Shipbuilding Co., Ltd. (72) Inventor Seiji Otani 1-6-14 Edobori, Nishi-ku, Osaka City, Osaka Prefecture Inside Hitachi Shipbuilding Co., Ltd.

Claims (1)

[Claims] 1. An electric field is formed between a pair of electrodes arranged in parallel in water by applying different potentials to each other, and an air pipe is arranged at the bottom of the water between the electrodes. A method for generating an electric screen, characterized in that air bubbles are ejected from a large number of air holes that are transparently provided in the electric field, and the electric field between the electrodes is mixed with the air bubbles to generate an electric screen for regulating swimming of seafood.