JPS6020657Y2 - Device to prevent biofouling on waterway walls - Google Patents

Description

[Detailed description of the invention] This invention relates to a device that prevents marine organisms from adhering to intake channels of power plants and the like.

Conventionally, chemical removal methods (paints, etc.) and physical methods (ultrasonic waves, high current, etc.) have been used to remove marine organisms that adhere to intake channels of power plants, etc., but these methods do not kill marine organisms. As a result, pollution problems were occurring.

As a countermeasure, there is a method to mechanically remove it, and one example is an underwater boat bottom cleaning machine, but it is inefficient because the device is small and the adhesion to the wall is weak, and it is also difficult to check whether it has been removed. Therefore, even if the open water intake channel becomes large, it requires a diver to dive directly into the waterway for visual inspection, which has the disadvantage of potentially causing a fatal accident.

The inventor realized that the following causes of organisms adhering to the walls of conventional water intake channels led him to come up with the present invention.

In other words, the adhesion of shellfish and algae to the waterway walls means that these marine organisms floating in the seawater stay near the walls where the flow is slow.
If the flow on the wall exceeds a certain velocity,
Does not stay or stick.

However, under normal conditions without artificial agitation, the flow velocity in a waterway is close to zero near the wall due to frictional resistance, as shown in Figure 1, which causes stagnation and adhesion of shellfish and algae. It became.

This invention was made based on the above knowledge,
A waterway for taking in seawater containing marine organisms, a water suction tube disposed in the waterway and equipped with a water suction fan at the bottom and a driving means for the water suction fan, and connected to the water suction tube by a pipe. It is characterized by comprising: a water injection device in which a water spray nozzle for spraying jet water is disposed toward the wall surface of the waterway; and means for moving the water absorption tube and the water injection device along the waterway wall. The purpose of this invention is to provide a device that prevents marine organisms from adhering to waterway walls by artificially preventing flow stagnation on the waterway walls.

A preferred embodiment of the present invention is shown in FIGS. 2 to 4 below.

In Figures 2 to 4, 1 is a cart, 2 is a drive motor for the cart, 3 is a rail installed on the waterway, 4 is a motor for driving a water suction fan, 5 is a water suction fan, 6 is a water suction tube, and 7 is a water discharger. Water injection device incorporating a nozzle, 8 is a water spray nozzle, 9
is a pipe, 10 is a channel wall, and 11 is a seawater level.

Note that the arrows in the figure indicate the flow of seawater and jet water.

The present embodiment is constructed as described above, and the water suction fan 5 is operated by the drive of the motor 4, and the sea ice is guided to the water discharge nozzle 8 through the water suction cylinder 6, and the jet water from the nozzle 8 is sprayed onto the waterway 10 wall. emitted in a direction along or towards.

The speed of the flow of jet water discharged from the discharge nozzle 8 is adjusted by the water suction fan drive motor 4, and the flow velocity Q is 5 m/s or more, preferably 1 to 2 m, which is a flow velocity at which living things do not attach.
The flow velocity of the seawater in the sea ice channels in the water absorption cylinder 6, pipe 9, and water injection device 7 is set to a flow velocity of Q, 5 m/s or more, which is a flow velocity at which living things do not attach. The capacity of the motor 4 and the nozzle diameter are determined accordingly.

Moreover, the trolley 1 that suspends the water absorption tube 6 and the water injection device 7 is
Jet water is ejected from the water nozzle 8 onto the wall of the water channel 10 and then travels on the rail 3 by the drive of the motor 2.

In this way, the motor 2 drives the cart 1 along the wall of the waterway 10 while sucking the seawater sucked in from the water suction fan 5 from the water discharge nozzle 8 onto the entire wall of the waterway 10 by driving the motor 4. Flows are artificially created throughout the area, and this flow can prevent marine life from stagnation and attachment.

Furthermore, the device of this embodiment is designed to thoroughly clean each location of the long and narrow waterway 10 by moving the cart 1, and compared to the device in which a large number of water discharge nozzles 8 are attached to the wall of the waterway 10,
Only a pair of devices are provided on the wall side of the water channel 10, and the equipment cost is low.

Furthermore, since the device of this embodiment can move the trolley 1 to a predetermined location, it is possible to move the trolley 1 to a predetermined location.
Move to the wall and spray jet water intensively to reach waterway 1.
Since water flow can be generated on the wall, the efficiency of preventing the adhesion of marine organisms is improved.

Furthermore, by operating the motors 2 and 4, a flow is generated on the entire wall surface of the waterway 10, and the adhesion of marine organisms can be prevented, so that there is no need for people to enter the intake waterway, thereby eliminating human accidents.

Further, since the water discharged from the water discharge nozzle 8 can be traced even on a curved surface, it can be used even in the case of a water intake channel 10 having a somewhat curved surface.

Furthermore, since the water discharged from the water discharge nozzle 8 uses seawater from the water intake channel 10, no other consumables are required, and the cost of maintaining the apparatus is reduced.

The device of this embodiment may be operated at appropriate time intervals depending on the degree of retention and adhesion of living organisms in the seawater.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of water flow velocity distribution in a waterway, Fig. 2 is an explanatory sectional view of an embodiment of the present invention, and Figs. 3 and 4 are explanatory diagrams of the main parts of Fig. 2. Figure 3 is a front view, Figure 4
The figure is a longitudinal sectional view taken along the line IV--IV in FIG. 3. 1...Bogie, 2...Dolly drive motor, 4...Water absorption fan drive motor, 5...
...Water absorption fan, 6...Water absorption cylinder, 7...
・Water injection device, 8...Water nozzle, 9...
... Pipeline, 10... Water intake waterway.

Claims (1)

[Scope of utility model registration request] A waterway for taking in seawater containing marine organisms, a water suction tube disposed in the waterway and equipped with a water suction fan at the bottom and a driving means for the water suction fan, and connected to the water suction tube by a pipe. It is characterized by comprising: a water injection device in which a water spray nozzle for spraying jet water is disposed toward the wall surface of the waterway; and means for moving the water absorption tube and the water injection device along the waterway wall. A device to prevent biofouling on waterway walls.