Ship antifouling device based on air layer resistance reduction

Abstract

The utility model relates to the technical field of ships, in particular to a marine antifouling device based on air layer resistance reduction, which comprises an air pipe, the air pipe comprises an air inlet and an air outlet, the cross section area of the air inlet is smaller than that of the air outlet, the air inlet is connected with a high-pressure air source, and the air outlet is connected with an air nozzle. The gallipot is used for containing a solid or gaseous marine organism repelling agent, and the gallipot is communicated with the air pipe through a supply pipe; a switch is arranged on the supply pipe and can adjust the size of an opening of the switch; a flow valve is arranged between the air pipe and the high-pressure air source and used for adjusting the flow of air entering the air pipe. The supply pipe is communicated with air cannons on the front side and the rear side of the switch.

Description

Technical Field

[0001] This utility model relates to the field of marine technology, and in particular to a marine antifouling device based on air layer drag reduction. Background Technology

[0002] When ships are anchored in tropical waters, marine organisms easily attach to valve boxes on the bottom of the ship and to the area below the waterline on the hull. Excessive attachment and colonization of marine organisms increases drag during navigation, clogs valves and related pipes on the bottom of the ship, affects the ship's usability, and significantly increases fuel consumption and carbon and sulfur emissions, severely reducing the ship's economic efficiency.

[0003] In the relevant technical solutions, the air layer drag reduction system is a system that reduces the ship's resistance during liquid navigation by spraying pressurized air onto the bottom plate during ship navigation and forming an air layer through the lubrication effect of the air. Its main function is to reduce resistance during navigation. Marine organism attachment occurs when the ship is anchored in tropical waters, so the system has almost no effect on the ship's antifouling.

[0004] To prevent marine organisms from attaching, antifouling paint is typically applied to the underwater areas of the ship's hull. This paint utilizes non-toxic, non-polluting self-polishing or silicone-based technologies. The smooth or soft surface of the antifouling paint increases the difficulty for marine organisms to attach, reducing their adhesion to the ship's bottom and thus achieving an antifouling effect. This also helps reduce drag, extends the lifespan of components such as the hull and valves, and improves the ship's fuel economy.

[0005] However, during long-term operation, the paint coating on the bottom of the hull naturally degrades quickly and is easily damaged and peels off (especially after the hull comes into contact with docks, canal fenders, or is cleaned by diving robots). This will seriously affect the hull's ability to resist fouling by marine life and accelerate the corrosion of the hull's steel plates. Utility Model Content

[0006] This invention provides a ship antifouling device based on air layer drag reduction, which can solve at least one of the above-mentioned technical problems.

[0007] To address the aforementioned technical problems, one or more embodiments of this utility model provide a marine antifouling device, including an air pipe with an inlet and an outlet. The cross-sectional area of ​​the inlet is smaller than that of the outlet. The inlet is connected to a high-pressure air source, and the outlet is connected to an air nozzle, which faces the ship's bottom plate. A medicine container is installed on the side wall of the pipe, containing an agent to repel marine organisms. The medicine container is connected to the air pipe via a supply pipe. A switch is provided on the supply pipe, allowing adjustment of its opening size. A flow valve is provided between the air pipe and the high-pressure air source to regulate the gas flow rate entering the air pipe. Air cannons are connected to both sides of the supply pipe before and after the switch.

[0008] The beneficial effects of one or more of the above technical solutions are as follows:

[0009] In this solution, a high-pressure air source is used to supply air to the air nozzles at the bottom of the ship. The high-pressure gas ejected from the nozzles can form a lubricating air layer at the bottom of the ship, which greatly reduces the resistance when the ship is sailing. When the ship is anchored, the air layer drag reduction system is circulated, and marine organism repellent and antifouling agents are mixed into the circulated air. This can repel marine organisms without harming them, greatly reducing the probability of marine organisms attaching to the bottom of the ship and reducing aquatic pollution caused by marine organism parasites.

[0010] In this design, the trachea is funnel-shaped. Due to the pressure air flowing from the narrow end to the wide end of the trachea, a negative pressure environment is created near the outlet of the supply pipe and the medicine canister. The medicine in the medicine canister will gradually enter the trachea under its own gravity and the negative pressure adsorption. The medicine and high-pressure gas are mixed in the funnel-shaped trachea. Furthermore, the cross-sectional area of ​​the trachea gradually increases in the direction away from the high-pressure gas source, which helps to provide sufficient mixing space for the medicine and gas to improve the mixing efficiency. This facilitates the uniform spraying of the mixture of high-pressure gas and medicine from the air nozzle.

[0011] In this solution, adjusting the switch and flow valve can change the airflow rate at the air nozzle and the mixing ratio of gas and agent, thus facilitating the anti-fouling protection of ships in different water temperatures and hydrological environments. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure in an embodiment of the present utility model;

[0013] Figure 2 This is a cross-sectional view of the structure of the trachea and supply tube of this utility model;

[0014] Figure 3 This is a schematic diagram of the stirring mechanism installed at the medicine tank in an embodiment of this utility model.

[0015] In the diagram, 1. Air pump; 2. Air pipe; 201. First pipe section; 202. Second pipe section; 3. Medicine tank; 4. Supply pipe; 5. Switch; 6. Flow valve; 7. Cleaning port; 8. Sealing plug; 9. Air cannon; 10. Branch pipe; 11. Air nozzle; 12. Cover; 13. Stirring shaft; 14. Motor; 15. Intermediate pipe. Detailed Implementation

[0016] To clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0017] See Figures 1-3This embodiment provides a ship antifouling device based on air layer drag reduction, including an air pipe 2, which includes an air inlet and an air outlet. The cross-sectional area of ​​the air inlet is smaller than that of the air outlet. The air inlet is connected to a high-pressure air source, and the air outlet is connected to an air nozzle 11. A medicine tank 3 is installed on the side wall of the air pipe 2. The medicine tank 3 is used to contain an agent to repel marine organisms. The medicine tank 3 is connected to the air pipe 2 through a supply pipe 4. A switch 5 is provided on the supply pipe 4, which can adjust the size of its opening. A flow valve 6 is provided between the air pipe 2 and the high-pressure air source to regulate the gas flow rate entering the air pipe 2. Air cannons 9 are connected to the supply pipe 4 on both sides before and after the switch 5.

[0018] Specifically, the air pipe 2 here is connected to a high-pressure air source via an intermediate pipe 15. This high-pressure air source is provided by an air pump 1; that is, one end of the intermediate pipe 15 is connected to the outlet of the air pump 1, and the other end of the intermediate pipe 15 is connected to the air inlet of the air pipe 2. In some other embodiments, the high-pressure air source is provided by a high-pressure air tank or a blower.

[0019] Specifically, multiple branch pipes 10 are connected to the air outlet of the air pipe 2, and the end of each branch pipe 10 is connected to the aforementioned air nozzle 11. The branch pipes 10 here can be... Figure 1 The straight pipe can also be a curved pipe or a multi-section bend pipe, which can be set according to the location of the corresponding air nozzle 11. Preferably, the branch pipe 10 here can be a corrugated pipe, silicone pipe, rubber pipe, etc., to facilitate bending or twisting.

[0020] In some locations, when the distance between the location of an air nozzle 11 and the second pipe section 202 is very small, the branch pipe 10 between the air nozzle 11 and the second pipe section 202 can be omitted, and the air nozzle can be directly installed on the side wall of the second pipe section 202.

[0021] Specifically, the switch 5 is connected in series on the supply pipe 4. By adjusting the size of the opening of the switch 5, the mixing ratio of the medicine in the medicine container 3 and the high-pressure gas source in the gas pipe 2 can be easily adjusted. As one specific structural form, the switch 5 includes a screw, one end of which forms a plug. The side wall of the supply pipe 4 is provided with a screw seat. The plug of the screw passes through the screw hole on the screw seat and enters the inner cavity of the supply pipe 4. By rotating the screw, the size of the plug entering the inner cavity of the supply pipe 4 can be adjusted, thereby facilitating the adjustment of the opening size of the supply pipe 4 at the plug.

[0022] In this embodiment, the trachea 2 includes a first pipe section 201 and a second pipe section 202 that are connected to each other. One end of the first pipe section 201 is connected to a high-pressure gas source, and the other end is connected to the second pipe section 202. The cross-sectional area of ​​the first pipe section 201 gradually increases in the direction away from the high-pressure gas source, while the cross-sectional area of ​​the second pipe section 202 is a constant value.

[0023] Specifically, the first pipe section 201 mentioned above is a variable diameter pipe section, and the second pipe section is a fixed diameter pipe section. See also... Figure 1 As one specific structural form, the first pipe section 201 includes a bottom wall, a top wall, and two side walls. The bottom wall is horizontally arranged, and the top wall extends upwards at an angle away from the high-pressure gas source. The two side walls are vertically arranged to connect the top and bottom walls. In this configuration, the first pipe section 201 has a square cross-section. Correspondingly, the second pipe section 202 is also a square pipe with a square cross-section. This structural arrangement facilitates the entire gas pipe 2 having a horizontally arranged bottom wall, allowing for support by the ship's hull.

[0024] In other embodiments, the first pipe segment 201 is a tapered pipe, and the second pipe segment 202 is a circular pipe, meaning that the cross-sections of the first pipe segment 201 and the second pipe segment 202 are circular. The smaller diameter end of the tapered pipe is connected to the intermediate pipe 15, and the larger diameter end of the tapered pipe is connected to the second pipe segment 202.

[0025] In this embodiment, the medicine container 3 is connected to the first pipe section 201 via the supply pipe 4. One end of the supply pipe 4 is connected to the medicine container 3, and the other end is connected to the first pipe section 201.

[0026] In this embodiment, the medicine container 3 is a vertically arranged funnel shape, and the lower end of the medicine container 3 is connected to the medicine container 3 through a vertical supply pipe 4.

[0027] Specifically, based on the funnel-shaped structure of the medicine container 3, the bottom wall of the medicine container 3 is a conical surface that gradually concaves from the periphery to the center. This conical surface facilitates the guidance of the medicine in the medicine container 3 to the supply pipe 4 along the conical surface.

[0028] In this embodiment, a stirring mechanism for solid medicine is installed inside the medicine tank 3. The stirring mechanism is used to achieve uniform stirring of the solid medicine in the medicine tank 3.

[0029] In this embodiment, the stirring mechanism includes a stirring shaft 13. The end of the medicine tank 3 away from the supply pipe 4 is open, and a detachable cover 12 is installed at the open end. The cover 12 is equipped with a motor 14 and a stirring shaft 13. At least part of the structure of the stirring shaft 13 is inserted into the inner cavity of the medicine tank 3.

[0030] In other embodiments, when the marine organism repellent agent used is gaseous, the stirring mechanism is omitted, and the tank 3 is modified to be airtight, with one inlet and one outlet. The inlet is used to receive the gaseous agent, and the outlet is used to connect to the supply pipe 4 to output the gaseous agent.

[0031] In this embodiment, the side wall of the supply pipe 4 is provided with two cleaning ports 7. Each cleaning port 7 is detachably fitted with a flexible sealing plug 8. The two cleaning ports 7 are located on both sides of the switch 5. The cleaning ports 7 are used to insert the air outlet of the air cannon 9. When the air cannon 9 is not needed, the air outlet is blocked by the sealing plug 8. When the air cannon 9 is needed, the sealing plug 8 is removed from the cleaning port 7, and then the air outlet of the air cannon 9 is inserted into the cleaning port 7.

[0032] In this embodiment, the agent is a solid powder agent or a gaseous agent.

[0033] As one specific solid pharmaceutical ingredient, capsaicin is used here.

[0034] Working principle: When it is necessary to remove organisms from the bottom of the hull, the high-pressure air source and switch 5 are turned on. High-pressure air flows in air pipe 2, thereby creating a negative pressure environment at the supply pipe 4. Under the action of negative pressure, the marine organism repellent, such as capsaicin, in the medicine tank 3 enters air pipe 2. Then, the high-pressure air and the medicine are injected into air pipe 2 to mix. The mixed gas-medicine mixture is sprayed to the corresponding position on the bottom of the ship through branch pipe 10 and air nozzle 11. It spreads flat with the bubbles, floats up and escapes to the underwater bottom plate, side plates, stern and other positions of the ship, diffuses to effectively repel marine organisms and prevent them from attaching.

[0035] The dosage of marine repellent agents such as capsaicin can be controlled by adjusting the opening and closing degree of switch 5 and the flow rate of high-pressure air.

[0036] In the event of accidental blockage or other obstruction of the marine organism repellent agent, or when marine organisms adhere to the air nozzle while the ship is anchored, the air cannon 9 can be used to spray and fire in different directions before and after switch 5 as needed to loosen the agent or clear the pipeline or air nozzle.

[0037] The above specific embodiments should not be construed as limiting the scope of protection of this utility model. For those skilled in the art, any alternative improvements or modifications made to the embodiments of this utility model shall fall within the scope of protection of this utility model.

[0038] Any aspects of this utility model not described in detail are known to those skilled in the art.

Claims

1. A marine antifouling device based on air layer drag reduction, characterized in that, The system includes an air pipe with an inlet and an outlet. The cross-sectional area of ​​the inlet is smaller than that of the outlet. The inlet is connected to a high-pressure air source, and the outlet is connected to an air nozzle positioned directly opposite the ship's bottom. A medicine container is installed on the side wall of the air pipe to hold an agent for repelling marine organisms. The medicine container is connected to the air pipe via a supply pipe. The supply pipe is equipped with a switch that can adjust the size of its opening. A flow valve is installed between the air pipe and the high-pressure air source to regulate the flow rate of gas entering the air pipe. Air cannons are connected to the supply pipe on both sides of the switch.

2. The antifouling device for ships based on air layer drag reduction according to claim 1, characterized in that, The trachea includes a first section and a second section that are connected to each other. One end of the first section is connected to a high-pressure gas source, and the other end is connected to the second section. The cross-sectional area of ​​the first section gradually increases in the direction away from the high-pressure gas source, while the cross-sectional area of ​​the second section is a constant value.

3. The antifouling device for ships based on air layer drag reduction according to claim 2, characterized in that, The medicine container is connected to the first pipe section via a supply pipe.

4. The antifouling device for ships based on air layer drag reduction according to claim 2, characterized in that, The first pipe section and the second pipe section both have square cross-sections. The first pipe section includes a horizontal bottom wall and a top wall that slopes upward away from the high-pressure gas source. The top wall and the bottom wall are connected by vertically arranged side walls. Alternatively, the first pipe section and the second pipe section have circular cross-sections.

5. The antifouling device for ships based on air layer drag reduction according to claim 1, characterized in that, The medicine container is a vertically arranged funnel shape, and the lower end of the medicine container is connected to the medicine container through a vertical supply pipe.

6. The antifouling device for ships based on air layer drag reduction according to claim 1, characterized in that, The medicine container is equipped with a stirring mechanism for solid medicine, which is used to achieve uniform stirring of the solid medicine in the medicine container.

7. The antifouling device for ships based on air layer drag reduction according to claim 6, characterized in that, The stirring mechanism includes a stirring shaft. The end of the medicine container away from the supply pipe is open, and a detachable cover is installed at the open end. The cover is equipped with a motor and the stirring shaft, and at least a portion of the stirring shaft is inserted into the inner cavity of the medicine container.

8. The antifouling device for ships based on air layer drag reduction according to claim 1, characterized in that, The supply pipe has two cleaning ports on its side wall. Each cleaning port is detachably fitted with a flexible sealing plug. The two cleaning ports are located on both sides of the switch and are used to insert into the air outlet of the air cannon.

9. The antifouling device for ships based on air layer drag reduction according to claim 1, characterized in that, The medicine container holds either a solid powder medicine or a gaseous medicine.

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