Bubble generating device and ship

Abstract

The invention relates to the technical field of ship resistance reduction, and particularly discloses a bubble generating device and a ship. A partition plate is arranged in an exhaust cavity and divides the exhaust cavity into a first compressed air cavity and a second compressed air cavity, and a plurality of first exhaust holes are formed in the bottom wall of the first compressed air cavity; a plurality of second exhaust holes are formed in the bottom wall of the second compressed air cavity, the first compressed air cavity and the second compressed air cavity share one communicated air conveying cavity, the air flow of the first compressed air cavity and the air flow of the second compressed air cavity are distributed through the adjusting assembly, and active control over the number and size of bubbles and the coverage range of a bubble layer is achieved; distribution of air quantity in the bubble generating device under different working conditions is reasonably controlled, escape of bubbles is reduced, the stability of a bubble layer is improved, and the resistance reduction effect of a ship body under complex working conditions is improved. In addition, by periodically adjusting the opening degree, a bubble group with the periodic distribution characteristic can be manufactured, and the resistance reduction effect better than that of a conventional bubble group can be obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of ship drag reduction, and particularly to a bubble generating device and a ship. Background Art

[0002] A bubble generating device is a device used to generate a large number of bubbles and form a bubble layer on the hull surface. When a ship is sailing, water will generate resistance to it. In order to reduce the ship resistance and improve the propulsion efficiency, people often create bubbles on the hull surface, so that part of the hull area is wrapped by the flow of water bubbles, and the frictional force on the hull surface is reduced by using the difference in the physical properties of the water-gas medium.

[0003] Most of the existing bubble generating devices cannot actively control the characteristics of the bubble layer, such as the coverage range of the bubble group and the bubble density distribution mode, which will reduce the drag reduction effect of the bubble drag reduction system to a certain extent under complex working conditions. For example, when the hull rolls horizontally in waves, the bubble layer at the bottom of the hull is extremely easy to leak from the side, resulting in the phenomenon of bubble escape, and then causing the interruption of the bubble layer or the reduction of the bubble density, reducing the stability of the bubble layer, so that the drag reduction effect of the bubble drag reduction system under complex sea conditions is poor. Summary of the Invention

[0004] The purpose of the present invention is to provide a bubble generating device and a ship, which can improve the adaptability of the bubble drag reduction system by reasonably regulating the range of the bubble layer and the bubble distribution density, and effectively improve the drag reduction effect of the ship under complex working conditions.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] On the one hand, the present invention provides a bubble generating device, including:

[0007] A housing, a cavity is provided in the housing, and the cavity includes a communicating exhaust cavity and air delivery cavity;

[0008] A partition, the partition is arranged in the exhaust cavity, and divides the exhaust cavity into a first compressed air cavity and a second compressed air cavity. The bottom wall of the first compressed air cavity is provided with a plurality of first exhaust holes, the bottom wall of the second compressed air cavity is provided with a plurality of second exhaust holes, the first compressed air cavity has a first air inlet, the second compressed air cavity has a second air inlet, the air delivery cavity is used to receive compressed air, the first air inlet communicates the air delivery cavity with the first compressed air cavity, and the second air inlet communicates the air delivery cavity with the second compressed air cavity;

[0009] An adjusting assembly, the adjusting assembly can adjust the opening degree of the first air inlet and the opening degree of the second air inlet.

[0010] As a preferred technical solution of the above-mentioned bubble generating device, the adjusting assembly includes a fixed shaft and an adjusting baffle. The fixed shaft is disposed in the cavity, and the adjusting baffle is rotatably connected to the fixed shaft, so that the adjusting baffle can open or close the first air inlet and the second air inlet.

[0011] As a preferred technical solution of the above-mentioned bubble generating device, the fixed shaft is fixedly connected to the partition plate and the bottom wall of the cavity.

[0012] As a preferred technical solution of the above-mentioned bubble generating device, the inner diameter sizes of the first compressed air cavity and the second compressed air cavity both gradually increase along the air flow direction.

[0013] As a preferred technical solution of the above-mentioned bubble generating device, the first compressed air cavity is provided with a first guide wall. The first guide wall is disposed opposite to the first air inlet, and the first guide wall has a guide curved surface. The guide curved surface is inclined with respect to the bottom wall of the first compressed air cavity, and the guide curved surface is used to guide the compressed gas to flow toward the plurality of first exhaust holes.

[0014] As a preferred technical solution of the above-mentioned bubble generating device, an air suction hole is formed in the outer side wall of the housing, and the air suction hole communicates with the air delivery cavity.

[0015] As a preferred technical solution of the above-mentioned bubble generating device, the first exhaust holes and the second exhaust holes are each one or more of circular, square, diamond-shaped or elliptical.

[0016] As a preferred technical solution of the above-mentioned bubble generating device, the plurality of first exhaust holes and the plurality of second exhaust holes are both distributed in a matrix pattern or a staggered pattern.

[0017] On the other hand, the present invention also provides a ship, including a hull and the bubble generating device in any of the above solutions, and the housing is installed at the bottom or side of the hull.

[0018] As a preferred technical solution of the above-mentioned ship, the ship further includes an air supply system for delivering compressed air to the air delivery cavity.

[0019] The beneficial effects of the present invention are:

[0020] The present invention provides a bubble generating device and a ship. The bubble generating device includes: a housing, a partition plate and an adjusting assembly. A cavity is provided inside the housing, and the cavity includes a communicated exhaust cavity and an air delivery cavity. The partition plate is disposed in the exhaust cavity, dividing the exhaust cavity into a first compressed air cavity and a second compressed air cavity. A plurality of first exhaust holes are provided on the bottom wall of the first compressed air cavity, and a plurality of second exhaust holes are provided on the bottom wall of the second compressed air cavity. The first compressed air cavity has a first air inlet, and the second compressed air cavity has a second air inlet. The air delivery cavity is used to receive compressed air. The first air inlet communicates the air delivery cavity with the first compressed air cavity, and the second air inlet communicates the air delivery cavity with the second compressed air cavity. The adjusting assembly can adjust the opening degree of the first air inlet and the opening degree of the second air inlet. With such a setting, by correspondingly adjusting the opening degrees of the first air inlet and the second air inlet through the adjusting assembly, the balance of the bubble discharge amounts from the first compressed air cavity and the second compressed air cavity is achieved. It adopts a design method with adjustable opening degrees to actively control the range of the bubble layer. For different working conditions of the hull, the distribution of the air volume inside the bubble generating device is reasonably controlled, further reducing the escape of bubbles and improving the stability of the bubble layer, effectively enhancing the drag reduction effect of the hull under complex working conditions. In addition, by periodically adjusting the opening degree, a bubble group with periodic distribution characteristics can be manufactured, and a better drag reduction effect than the conventional bubble group can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the bubble generating device provided by the present invention;

[0022] Figure 2 is a partial structural schematic diagram of the bubble generating device provided by the present invention Figure 1 ;

[0023] Figure 3 is a partial structural schematic diagram of the bubble generating device provided by the present invention Figure 2 ;

[0024] Figure 4 is a partial structural schematic diagram of the bubble generating device provided by the present invention Figure 3 .

[0025] Figure 5 is a schematic diagram of bubbles when three bubble generating devices provided by the present invention are installed at the bottom of the hull and the opening degrees of the first compressed air cavity and the second compressed air cavity of each bubble generating device are the same;

[0026] Figure 6 is a schematic diagram of bubbles when three bubble generating devices provided by the present invention are installed at the bottom of the hull and one of the first compressed air cavities or the second compressed air cavities of the two bubble generating devices located on the outside is closed;

[0027] Figure 7Schematic diagram of bubbles when two bubble generating devices provided by the present invention are installed on the side of the hull and the opening degrees of the first compressed air chamber and the second compressed air chamber of each bubble generating device are the same;

[0028] Figure 8 Schematic diagram of bubbles when two bubble generating devices provided by the present invention are installed on the side of the hull and the uppermost first compressed air chamber is closed;

[0029] Figure 9 Schematic diagram of bubbles when the opening degrees of the first compressed air chamber and the second compressed air chamber of the bubble generating device provided by the present invention are the same;

[0030] Figure 10 Schematic diagram of bubbles when one of the first compressed air chamber and the second compressed air chamber of the bubble generating device provided by the present invention is closed;

[0031] Figure 11 Schematic diagram of the bubble generating device provided by the present invention for periodically controlling the bubble density distribution.

[0032] Wherein:

[0033] 1. Housing;

[0034] 2. Exhaust chamber; 21. First compressed air chamber; 22. Second compressed air chamber;

[0035] 3. Air delivery chamber; 4. Partition board; 5. First exhaust hole; 6. Second exhaust hole; 7. Fixed shaft; 8. Adjusting baffle; 9. First guiding wall; 10. Second guiding wall; 11. Suction hole; 12. Hull. Detailed implementation manners

[0036] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0037] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0038] Unless otherwise clearly defined and limited, the terms "install", "connect", "link", "fix" shall be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first feature and the second feature, or may include the situation where the first feature and the second feature are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0040] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and through specific embodiments.

[0041] As Figures 1 to 11 shown, this embodiment provides a bubble generating device, which includes: a housing 1, a partition 4 and an adjusting assembly. A cavity is provided inside the housing 1, and the cavity includes a communicating exhaust cavity 2 and an air delivery cavity 3. The partition 4 is arranged in the exhaust cavity 2, dividing the exhaust cavity 2 into a first compressed air cavity 21 and a second compressed air cavity 22. A plurality of first exhaust holes 5 are provided on the bottom wall of the first compressed air cavity 21, and a plurality of second exhaust holes 6 are provided on the bottom wall of the second compressed air cavity 22. The first compressed air cavity 21 has a first air inlet, and the second compressed air cavity 22 has a second air inlet. The air delivery cavity 3 is used to receive compressed air. The first air inlet communicates the air delivery cavity 3 with the first compressed air cavity 21, and the second air inlet communicates the air delivery cavity 3 with the second compressed air cavity 22. The adjusting assembly can adjust the opening degrees of the first air inlet and the second air inlet. With such a setting, by correspondingly adjusting the opening degrees of the first air inlet and the second air inlet through the adjusting assembly, the balance of the bubble discharge amounts from the first compressed air cavity 21 and the second compressed air cavity 22 is achieved. It adopts a design method with adjustable opening degrees to actively control the range of the bubble layer. For different working conditions of the hull 12, the distribution of the air volume inside the bubble generating device is reasonably controlled, further reducing the escape of bubbles, improving the stability of the bubble layer, and effectively enhancing the drag reduction effect of the hull 12 under complex working conditions.

[0042] Furthermore, the bubble generating device further includes a control valve, which can regulate the adjusting assembly to achieve periodic swinging. By periodically adjusting the opening degree, a bubble group with periodic distribution characteristics can be manufactured, and a better drag reduction effect than the conventional bubble group can be obtained.

[0043] It should be noted that, as shown in Figures 5 to 11 The bubble generating device of this embodiment can be used for drag reduction in both the flat area at the bottom of the hull 12 and the side area of the hull 12 through the design method with adjustable opening degree. And by reasonably controlling the width range of the bubble layer through opening degree adjustment, it can adapt to the change of the draft of the hull 12.

[0044] Specifically, this embodiment exemplarily provides the following technical solution. The adjusting assembly includes a fixed shaft 7 and an adjusting baffle 8. The fixed shaft 7 is arranged in the cavity, and the fixed shaft 7 is fixedly connected to the partition plate 4 and the bottom wall of the cavity. The adjusting baffle 8 is rotatably connected to the fixed shaft 7, so that the adjusting baffle 8 can open or close the first air inlet and the second air inlet. With such a setting, the adjusting baffle 8 can play a role in intercepting by rotating around the fixed shaft 7 at different angles, so as to realize different degrees of opening and closing of the first compressed air chamber 21 and the second compressed air chamber 22, thereby reasonably adjusting the range and density of bubble generation.

[0045] Optionally, the inner diameter sizes of both the first compressed air chamber 21 and the second compressed air chamber 22 gradually increase along the air flow direction. With such a setting, both the first compressed air chamber 21 and the second compressed air chamber 22 adopt an expanding structure design, which can slow down the air flow speed, make the compressed air pass through the orifice plates of multiple first exhaust holes 5 or multiple second exhaust holes 6 more evenly, avoid local air flow concentration, and make the bubble coverage on the surface of the hull 12 more continuous, thus improving the drag reduction effect.

[0046] In this embodiment, in order to further ensure uniform air flow distribution and optimize the bubble generation effect, the first compressed air chamber 21 is provided with a first flow guiding wall 9. The first flow guiding wall 9 is arranged opposite to the first air inlet, and the first flow guiding wall 9 has a flow guiding curved surface. The flow guiding curved surface is inclined relative to the bottom wall of the first compressed air chamber 21, and the flow guiding curved surface is used to guide the compressed gas to flow towards the multiple first exhaust holes 5. The second compressed air chamber 22 is provided with a second flow guiding wall 10. The second flow guiding wall 10 is arranged opposite to the second air inlet, and the second flow guiding wall 10 has a guiding curved surface. The guiding curved surface is inclined relative to the bottom wall of the second compressed air chamber 22, and the guiding curved surface is used to guide the compressed gas to flow towards the multiple second exhaust holes 6.

[0047] Optionally, in order to facilitate the delivery of gas into the air delivery cavity 3, an air suction hole 11 is opened on the outer side wall of the housing 1, and the air suction hole 11 communicates with the air delivery cavity 3.

[0048] Optionally, both the first exhaust hole 5 and the second exhaust hole 6 are one or more of circular, square, diamond-shaped, or oval. Further, the inner diameters of both the first exhaust hole 5 and the second exhaust hole 6 are d, and d satisfies: 0.003m ≤ d ≤ 0.1m. The actual size value of d can be set according to actual needs and will not be further restricted here.

[0049] Optionally, the multiple first exhaust holes 5 and the multiple second exhaust holes 6 are both distributed in a matrix pattern or in a staggered pattern.

[0050] This embodiment also provides a ship, including a hull 12 and the bubble generating device in the above solution, and the housing 1 is installed at the bottom or side of the hull 12.

[0051] Optionally, the ship further includes an air supply system, and the air supply system conveys compressed air to the air delivery chamber 3 through the air suction hole 11.

[0052] The following describes how the bubble generating device in this embodiment actively regulates the range of the bubble layer:

[0053] When the bubble generating device is used for drag reduction in the flat area at the bottom of the hull 12, when the ship is moving in the waves, especially when the rolling amplitude of the ship is relatively large, the bottom of the hull 12 is inclined. At this time, the bubble layer at the bottom of the ship may leak, affecting the bubble drag reduction effect. For this reason, the width of the bubble layer can be reduced by closing the outermost first compressed air chamber 21 or the second compressed air chamber 22, reducing the risk of bubble leakage.

[0054] When the bubble generating device is used for drag reduction in the side area of the hull 12, the draft of the ship will change with the loading amount. The opening and closing of the uppermost first compressed air chamber 21 or the second compressed air chamber 22 can be adjusted to prevent the compressed air from leaking directly into the atmosphere.

[0055] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention and are not limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A bubble generating device, characterized in that, Comprising: A housing (1), within which there is a cavity, and the cavity includes a connected exhaust chamber (2) and air delivery chamber (3); A partition (4), which is arranged within the exhaust chamber (2) and divides the exhaust chamber (2) into a first compressed air chamber (21) and a second compressed air chamber (22). The bottom wall of the first compressed air chamber (21) is provided with a plurality of first exhaust holes (5), and the bottom wall of the second compressed air chamber (22) is provided with a plurality of second exhaust holes (6). The first compressed air chamber (21) has a first air inlet, and the second compressed air chamber (22) has a second air inlet. The air delivery chamber (3) is used to receive compressed air. The first air inlet connects the air delivery chamber (3) and the first compressed air chamber (21), and the second air inlet connects the air delivery chamber (3) and the second compressed air chamber (22); An adjustment assembly, which can adjust the opening degree of the first air inlet and the opening degree of the second air inlet.

2. The bubble generating device according to claim 1, wherein The adjustment assembly includes a fixed shaft (7) and an adjustment baffle (8). The fixed shaft (7) is arranged within the cavity, and the adjustment baffle (8) is rotatably connected to the fixed shaft (7), enabling the adjustment baffle (8) to open or close the first air inlet and the second air inlet.

3. The bubble generating device according to claim 2, wherein, The fixed shaft (7) is fixedly connected to the partition (4) and the bottom wall of the cavity.

4. The bubble generating device according to claim 1, wherein The inner diameter size of the first compressed air chamber (21) and the inner diameter size of the second compressed air chamber (22) both gradually increase along the air flow direction.

5. The bubble generating device according to claim 1, characterized in that, The first compressed air chamber (21) is provided with a first flow guiding wall (9), which is arranged opposite to the first air inlet, and the first flow guiding wall (9) has a flow guiding curved surface. The flow guiding curved surface is inclined with respect to the bottom wall of the first compressed air chamber (21), and the flow guiding curved surface is used to guide the compressed gas to flow towards the plurality of first exhaust holes (5).

6. The bubble generating device according to any one of claims 1-5, characterized in that, An air suction hole (11) is formed on the outer side wall of the housing (1), and the air suction hole (11) communicates with the air delivery chamber (3).

7. The bubble generating device according to any one of claims 1-5, characterized in that Both the first exhaust holes (5) and the second exhaust holes (6) are in one or more of the shapes of circular, square, diamond or oval.

8. The bubble generating device according to any one of claims 1-5, characterized in that, The plurality of first exhaust holes (5) and the plurality of second exhaust holes (6) are both distributed in a matrix pattern or a staggered pattern.

9. A ship, characterized in that, Including a hull (12) and a bubble generating device as described in any one of claims 1 - 8, and the housing (1) is installed at the bottom or side of the hull (12).

10. The ship according to claim 9, characterized in that, The ship further includes a gas supply system, which is used to deliver compressed air to the air delivery chamber (3).

Images