JPH04333712A - Protector for organism intruding to intake path - Google Patents

Abstract

PURPOSE:To prevent electric shock to large-size organisms by a method in which a pair of metal plates are provided on the upstream and downstream sides of an electric screen to make up a bridge circuit including an electric resistance formed by the paired metal plates, and the control power source of the electric screen is controlled by output signals from the bridge circuit not equilibrated. CONSTITUTION:Paired metal plates 6 consisting of metal plates 5 are provided on the upstream and downstream sides of an electric screen 3 in an intake channel 1 to make up a bridge circuit 7 including electric resistances Ra and Rb which are formed by the plates 6. Under a condition that large-size organisms do not intrude into the channel 1, a movable terminal K is regulated to equilibrate the circuit 7. When large-size organism intrudes into any one of the plates 6, one of the resistances Ra and Rb is changed to put the equilibrium of the bridge 7 to out of order, and an electric current flows between output terminals (a) and (b). The electric current is converted into voltage in a converter H and amplified, and the control power source of the screen 3 is turned OFF for a fixed time period through a timer circuit T by a control circuit C.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is an intake channel that prevents large creatures such as humans from approaching an electric screen that prevents aquatic creatures such as fish from entering the intake channel and receiving an electric shock. Concerning devices for protecting against invasive organisms.

0002

[Prior Art] Conventionally, in order to prevent aquatic organisms from entering an intake channel, electrodes were provided on both sides of the intake channel, and a DC voltage, an AC voltage, or a pulse voltage was applied to both electrodes by a power source for generating an electric screen. An electric screen is formed between both electrodes to provide electrical stimulation to living things and keep them away from the electric screen, thereby preventing the intrusion of living things.

0003

Problems to be Solved by the Invention When the conventional electric screen generator is installed in an intake waterway, there is a problem in that when large creatures such as humans approach the electric screen, accidents such as electric shock may occur.

[0004] Furthermore, if fences or the like are provided on the upstream and downstream sides of the electric screen to prevent access, there is a problem that the electric screen becomes clogged with garbage, causing problems with water intake.

[0005] The present invention takes the above points into consideration, and an object of the present invention is to provide a device for protecting an invading creature in an intake channel, which prevents damage even if a large creature such as a human approaches an electric screen.

[0006]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the device for protecting invading organisms in an intake channel of the present invention includes an electric screen for preventing the invasion of aquatic organisms installed in the intake channel, and an electric screen on the upstream side of this screen. and a pair of metal plates provided on both walls of the intake channel on the downstream side, an electric resistance formed by the pair of metal plates on the upstream side, and an electric resistance formed by the pair of metal plates on the downstream side. The screen is equipped with an AC or DC bridge circuit, and a control circuit that outputs a control signal to the control power source of the screen based on the output signal of the bridge circuit, which is unbalanced due to a change in the resistance of the pair of metal plates.

[0007]

[Operation] The device for protecting invading organisms in an intake channel of the present invention configured as described above includes a pair of metal plates provided on the upstream side and a downstream side of the electric screen, and includes an electric resistance formed by the pair of metal plates. By constructing a bridge circuit, the control power of the electric screen is controlled by the output signal of the unbalanced bridge circuit, so that by turning off or weakening the control power, it does not harm large creatures and ensures that large creatures are safe. protected.

[0008]

[Embodiment] One embodiment will be explained with reference to the drawings. In FIG. 2, 1 is an intake channel, and 2 is an electrode provided on both sides of the intake channel 1, which is in the shape of a plate or a plurality of rods, and both electrodes 2 are supplied with DC voltage, AC voltage, or By applying a pulse voltage, both electrodes 2
An electric screen 3 is formed in between. 4 is a large creature such as a human being.

Next, in FIG. 1, reference numeral 5 denotes metal plates of the same size, which are provided facing each other at equidistant positions on the upstream and downstream sides of the electric screen 3 of the intake channel 1. A pair of metal plates 6 are formed, and electric resistances Ra and Rb proportional to the conductivity of water are formed in both pairs of metal plates 6. When a large creature 4 invades between the pair of metal plates 6, the resistance value increases from around point P at the time of the invasion, as shown in FIG.

R is a variable resistor whose both ends are connected to the DC power supply (+V), and whose both ends are connected to one metal plate 5 of the pair of metal plates 6.
, and is divided by a movable terminal K into resistors Rc and Rd. 7 is a DC or AC bridge circuit composed of resistors Ra, Rb, Rc, and Rd, and a movable terminal K
serves as one output terminal a, and the connection point of the other metal plate 5 of both metal plate pairs 6 serves as the other output terminal b, which is connected to the current-voltage converter H. A is an amplifier that amplifies the output of the converter H, T is a timer circuit that is driven for a certain period of time by the output of the amplifier A, and C is a control circuit that outputs a control signal while the timer circuit T is driving, and controls the control power source of the electric screen. Turn off.

[0011] First, the movable terminal K is adjusted in a state where there is no large creature 4 entering the intake channel 1, and the bridge circuit 7 is balanced. Next, when the large creature 4 invades one of the metal plate pairs 6, one of the resistors Ra and Rb changes, the balance of the bridge 7 is disrupted, and a current flows between the output terminals a and b. This current is converted to voltage by converter H, and then amplified.
Through the timer circuit T, the control circuit C turns off the control power of the electric screen 3 for a certain period of time.

0012

[Effects of the Invention] Since the present invention is constructed as described above, it produces the effects described below. A pair of metal plates 6 are provided on the upstream and downstream sides of the electric screen 3, and a bridge circuit 7 is configured including electric resistances Ra and Rb formed by both the pair of metal plates 6, thereby creating an unbalanced bridge circuit 7.
Since the control power source of the electric screen 3 is controlled by the output signal of the electric screen 3, the control power source of the electric screen 3 can be turned off or weakened, and the large creature can be safely protected without causing any harm to the large creature.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an embodiment of the device for protecting invading organisms in an intake channel according to the present invention.

FIG. 2 is a plan view of a portion of FIG. 1;

FIG. 3 is a diagram showing changes in resistance value in FIG. 1;

[Explanation of symbols]

1 Intake channel 3 Electric screen 5 Metal plate 6 Metal plate pair 7 Bridge circuit C Control circuit

Claims (1)

[Claims] 1. An electric screen for preventing intrusion of aquatic organisms installed in an intake channel, a pair of metal plates provided on both walls of the intake channel on the upstream and downstream sides of the screen, and the metal plate on the upstream side. An AC or DC bridge circuit including an electrical resistance formed by a pair of metal plates on the downstream side and an electrical resistance formed by a pair of metal plates on the downstream side, and an electric resistance formed by a pair of metal plates on the downstream side, A control circuit for outputting a control signal to the control power source of the screen based on the output signal of the bridge circuit.