Modular jet device for air layer drag reduction

Abstract

The present invention discloses a modular air layer drag reduction jet device, which includes a cylinder, a rotating air cylinder arranged in the cylinder, and a driving mechanism for driving the rotating air cylinder to rotate in the cylinder; the upper part of the cylinder is provided with a plurality of cleaning ports, and the lower part of the cylinder is provided with a plurality of jet ports; the rotating air cylinder includes an air cylinder body, and a plurality of micro air holes are arranged on one side outer wall of the air cylinder body, and hollow shafts are arranged at both ends of the air cylinder body, and the ends of the hollow shafts form air inlets for gas to enter the inner cavity; the micro air holes of the rotating air cylinder can be rotated to the cleaning ports or the jet ports under the drive of the driving mechanism. The modular air layer drag reduction jet device of the present invention can realize the adjustment of jet and jet hole cleaning, does not affect the original resistance of the ship when not jetting, and has no additional resistance of the device when jetting, so that the jet drag reduction effect is optimized.

Description

Technical Field

[0001] The invention relates to the technical field of drag reduction of ship and marine engineering ship models, and in particular to an air layer drag reduction modular jet device. Background Art

[0002] With the progress of science and technology and the great attention paid by human beings to environmental resources, energy conservation and emission reduction have become a theme of the new era. In the research on energy conservation and emission reduction in the field of ships, reducing ship resistance is an important content. There are endless measures such as line optimization, energy-saving appendages, new coating applications, and air layer drag reduction. In theory, the friction coefficients of air and water on the surface of the hull are different, which is mainly related to viscosity. The viscosity coefficient of air is much lower than that of water. Therefore, by forming a thin air layer between the water and the surface of the hull, the friction resistance between the hull and the moving can be reduced, thereby achieving the effect of drag reduction and energy saving. The air layer is formed by jetting through micropores. When the ship is sailing on the sea, the micropores are easily blocked due to the attachment of microorganisms, so they need to be cleaned regularly. If the ship enters the dock for cleaning, it will cause a lot of manpower and financial resources. In addition, it is also necessary to consider the watertightness problem when cleaning after installing a jet device on the bottom of the ship. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned background technology and provide an air layer drag reduction modular jet device, which can realize micro-pore jet for air layer drag reduction, clean the micro-pores without the ship entering the dock, and ensure the watertight performance of the hull at the same time.

[0004] To achieve the above-mentioned purpose, the present invention is a modular air layer drag reduction jet device, comprising a cylinder, a rotating air cylinder arranged in the cylinder, and a driving mechanism for driving the rotating air cylinder to rotate in the cylinder; the upper part of the cylinder is provided with a plurality of cleaning ports, and the lower part of the cylinder is provided with a plurality of jet ports;

[0005] The rotating gas cylinder comprises a gas cylinder body, a plurality of micro-pores are arranged on an outer wall of one side of the gas cylinder body, hollow shafts are arranged at both ends of the gas cylinder body, and the ends of the hollow shafts form air inlets for allowing gas to enter the inner cavity; the micro-pores of the rotating gas cylinder can be rotated to a cleaning port or an air jet port under the drive of a driving mechanism.

[0006] Furthermore, the cylinder comprises a first half cylinder and a second half cylinder which are detachably connected, and the first half cylinder and the second half cylinder together form a cavity for accommodating the rotating air cylinder.

[0007] Furthermore, the first half cylinder is arranged at the upper part of the cylinder, and a plurality of cleaning openings are opened on the first half cylinder.

[0008] Furthermore, two adjacent cleaning openings are arranged in a staggered manner.

[0009] Furthermore, the second half cylinder is arranged at the lower part of the cylinder, and a plurality of air jet openings are opened on the second half cylinder.

[0010] Furthermore, a plurality of the air jet openings are arranged in parallel.

[0011] Furthermore, the cylinder body comprises a metal inner layer and a watertight lubricating outer layer, and the metal inner layer and the watertight lubricating outer layer are fixedly connected.

[0012] Furthermore, the hollow shafts at both ends of the cylinder body are rotatably mounted on both ends of the cylinder body through first bearings respectively.

[0013] Furthermore, the driving mechanism includes a transmission component and a motor connected to the transmission component; the transmission component includes a worm wheel and a worm, the worm wheel is sleeved on a hollow shaft at one end of the rotating air cylinder and fixedly connected to it, the helical tooth segment of the worm is meshed with the worm wheel, and the smooth rod segment of the worm is connected to the output shaft of the motor via a coupling.

[0014] Furthermore, the transmission assembly further comprises a housing, and the worm is rotatably mounted in the housing via a second bearing;

[0015] The motor is also provided with a motor mounting seat, and the motor mounting seat is fixedly connected to the housing.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] Firstly, the cylinder of the modular air layer drag reduction jet device of the present invention is designed with jet ports and cleaning ports, and the rotating air cylinder is provided with micro-air holes. When the micro-air holes of the rotating air cylinder rotate to the jet port position, micro-bubbles can be sprayed toward the bottom of the ship, and when it rotates to the cleaning port position, the micro-air holes can be cleaned in the cabin, thereby realizing the adjustment of micro-air hole jet and jet hole cleaning for air layer drag reduction. When no jet is sprayed, the original resistance of the ship is not affected, and there is no additional resistance of the device during jet spray, thereby achieving the best jet drag reduction effect.

[0018] Secondly, the rotary air cylinder designed in the air layer drag reduction modular jet device of the present invention is pressed together by the first half cylinder and the second half cylinder so that the watertight lubricating outer layer of the inner rotary air cylinder is in a tightly matched state, thereby achieving watertightness.

[0019] Thirdly, the modular air layer drag reduction jet device of the present invention can realize the micro-pore jet for air layer drag reduction, clean the micro-pores without the ship entering the dock, and at the same time ensure the watertightness of the hull while realizing the air hole position control.

[0020] Fourthly, the driving mechanism of the air layer drag reduction modular jet device of the present invention is designed with a motor and a worm gear transmission assembly, and the worm gear transmission assembly can realize the rotation of a large friction drum under a small torque. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of an air layer drag reduction modular jet device;

[0022] Figure 2 for Figure 1 The schematic diagram of the main structure of the air layer drag reduction modular jet device shown;

[0023] Figure 3 for Figure 1 A schematic diagram of the top view of the air layer drag reduction modular jet device shown;

[0024] Figure 4 for Figure 1 A schematic diagram of the structure of the modular air layer drag reduction jet device as viewed from above;

[0025] Figure 5 It is a schematic diagram of the cross-sectional structure of a rotating air cylinder;

[0026] Figure 6 is a schematic cross-sectional structural diagram of a driving mechanism;

[0027] In the figure: cylinder 1, first half cylinder 1.1, second half cylinder 1.2, rotating air cylinder 2, air cylinder body 2.1, metal inner layer 2.11, watertight lubricating outer layer 2.12, micropores 2.2, hollow shaft 2.3, air inlet 2.4, drive mechanism 3, transmission assembly 3.1, worm gear 3.11, worm 3.12, housing 3.13, motor 3.2, motor mounting seat 3.3, cleaning port 4, air jet port 5, first bearing 6, coupling 7, second bearing 8. DETAILED DESCRIPTION

[0028] The following is a detailed description of the implementation of the present invention in conjunction with the implementation cases, but they do not constitute a limitation of the present invention and are only given as examples. At the same time, the advantages of the present invention will become clearer and easier to understand through the description.

[0029] like Figure 1The air layer drag reduction modular jet device shown in the figure comprises a cylinder 1, a rotating cylinder 2 arranged in the cylinder 1, and a driving mechanism 3 for driving the rotating cylinder 2 to rotate in the cylinder 1; a plurality of cleaning ports 4 are arranged on the upper part of the cylinder 1, and a plurality of jet ports 5 are arranged on the lower part of the cylinder 1; the rotating cylinder 2 comprises a cylinder body 2.1, a plurality of micro air holes 2.2 are arranged on one side outer wall of the cylinder body 2.1, a hollow shaft 2.3 is arranged at both ends of the cylinder body 2.1, and an air inlet 2.4 for gas to enter the inner cavity is formed at the end of the hollow shaft 2.3; the micro air holes 2.2 of the rotating cylinder 2 can be rotated to the cleaning port 4 or the jet port 5 under the drive of the driving mechanism 3. When the micro air holes 2.2 of the rotating cylinder 2 rotate to the jet port 5 position, micro bubbles can be sprayed to the bottom of the ship, and when it rotates to the cleaning port 4 position, the micro air holes 2.2 can be cleaned in the cabin.

[0030] like Figure 2 to Figure 4 As shown, the cylinder 1 includes a first half cylinder 1.1 and a second half cylinder 1.2 that are detachably connected. The first half cylinder 1.1 and the second half cylinder 1.2 enclose a cavity for accommodating the rotating air cylinder 2. The first half cylinder 1.1 and the second half cylinder 1.2 are assembled and fixed by bolt assemblies, screws or snap assemblies. The first half cylinder 1.1 is arranged at the upper part of the cylinder 1, and a plurality of cleaning ports 4 are provided on the first half cylinder 1.1. The two adjacent cleaning ports 4 are arranged in a staggered manner. In this way, the cleaning ports 4 on the first half cylinder 1.1 can be arranged in sections and staggered, and the air holes can be cleaned in sections while ensuring the strength. The second half cylinder 1.2 is arranged at the lower part of the cylinder 1, and a plurality of jet ports 5 are provided on the second half cylinder 1.2. The plurality of jet ports 5 are arranged in parallel. In this embodiment, the second half cylinder 1.2 is installed on the bottom of the ship through a prefabricated base, so that the jet ports 5 face the bottom of the ship, and the rest is placed inside the cabin.

[0031] like Figure 5 As shown, the cylinder body 2.1 includes a metal inner layer 2.11 and a watertight lubricating outer layer 2.12, and the metal inner layer 2.11 and the watertight lubricating outer layer 2.12 are fixedly connected. The metal inner layer 2.11 is made of metal material, and the watertight lubricating outer layer 2.12 is made of watertight lubricating material. In this embodiment, the metal inner layer 2.11 and the watertight lubricating outer layer 2.12 are firmly bonded into a whole by an adhesive. A gas mixing core can be added to the cylinder body 2.1 to make the gas mix evenly. The hollow shafts 2.3 at both ends of the cylinder body 2.1 are rotatably mounted on the two ends of the cylinder 1 through the first bearing 6, and the air inlet 2.4 can be connected to the gas output port of the external air supply device through the air pipe. The rotating cylinder 2 is pressed by the first half cylinder 1.1 and the second half cylinder 1.2 so that the watertight lubricating outer layer 2.12 of the internal rotating cylinder 2 is in a tight fit state, which can achieve watertightness.

[0032] like Figure 6As shown, the driving mechanism 3 includes a transmission assembly 3.1 and a motor 3.2 that is transmission-connected to the transmission assembly 3.1; the transmission assembly 3.1 includes a worm wheel 3.11 and a worm 3.12, the worm wheel 3.11 is sleeved on the hollow shaft 2.3 at one end of the rotating cylinder 2 and is fixedly connected thereto, the spiral tooth segment of the worm 3.12 is meshed with the worm wheel 3.11, and the smooth rod segment of the worm 3.12 is transmission-connected to the output shaft of the motor 3.2 through a coupling 7. The transmission assembly 3.1 also includes a housing 3.13, and the worm 3.12 is rotationally mounted in the housing 3.13 through a second bearing 8; a motor mounting seat 3.3 is also provided on the motor 3.2, and the motor mounting seat 3.3 is fixedly connected to the housing 3.13.

[0033] The working principle of the air layer drag reduction modular jet device of the present invention is as follows: the motor 3.2 drives the worm 3.12 of the transmission assembly 3.1 to rotate, and the worm 3.12 drives the worm wheel 3.11 in the device to rotate. The worm wheel 3.11 is connected to the shaft of the internal rotating air cylinder 2. The rotation of the turbine drives the rotating air cylinder 2 to rotate. When the micro-pores 2.2 are rotated to face the jet port 5, the high-pressure gas entering the rotating air cylinder 2 through the air inlet can be ejected from the micro-pores 2.2. Since the first half cylinder 1.1 is in the cabin, when the rotating air cylinder 2 rotates to the micro-pores 2.2 to align with the cleaning port 4, the micro-pores can be cleaned in the cabin. Since the cleaning port 4 is opened according to the area, it will not affect the pressing strength of the first half cylinder 1.1. After the first half cylinder 1.1 and the second half cylinder 1.2 are pressed together, the internal rotating air cylinder 2 can rotate under pressure to achieve watertightness, and the transmission assembly 3.1 can realize the rotation of the large friction drum under small torque. The worm gear can realize position self-locking, and the motor 3.2 adopts a servo or stepper motor which can realize angle control.

[0034] The above are only specific embodiments of the present invention. It should be pointed out that any changes or substitutions that can be easily thought of by any technician familiar with the field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. The rest not described in detail are prior arts.

Claims

1. A modular air jet device for reducing air layer drag, characterized in that: It comprises a cylinder (1), a rotating air cylinder (2) arranged in the cylinder (1), and a driving mechanism (3) for driving the rotating air cylinder (2) to rotate in the cylinder (1); a plurality of cleaning openings (4) are arranged at the upper part of the cylinder (1), and a plurality of air jet openings (5) are arranged at the lower part of the cylinder (1); The rotating gas cylinder (2) comprises a gas cylinder body (2.1), a plurality of micro air holes (2.2) are arranged on an outer wall of one side of the gas cylinder body (2.1), hollow shafts (2.3) are arranged at both ends of the gas cylinder body (2.1), and the ends of the hollow shafts (2.3) form air inlets (2.4) for allowing gas to enter the inner cavity; the micro air holes (2.2) of the rotating gas cylinder (2) can be driven by a driving mechanism (3) to rotate to a cleaning port (4) or an air jet port (5); The gas cylinder body (2.1) comprises a metal inner layer (2.11) and a watertight lubricating outer layer (2.12), and the metal inner layer (2.11) and the watertight lubricating outer layer (2.12) are fixedly connected; The hollow shafts (2.3) at both ends of the cylinder body (2.1) are rotatably mounted on the two ends of the cylinder body (1) via first bearings (6) respectively.

2. The air layer drag reduction modular jet device according to claim 1, characterized in that: The cylinder (1) comprises a first half cylinder (1.1) and a second half cylinder (1.2) which are detachably connected, and the first half cylinder (1.1) and the second half cylinder (1.2) enclose a cavity for accommodating a rotating air cylinder (2).

3. The air layer drag reduction modular jet device according to claim 2, characterized in that: The first half cylinder (1.1) is arranged at the upper part of the cylinder (1), and a plurality of cleaning openings (4) are provided on the first half cylinder (1.1).

4. The air layer drag reduction modular jet device according to claim 3, characterized in that: Two adjacent cleaning openings (4) are arranged in a staggered manner.

5. The air layer drag reduction modular jet device according to claim 2, characterized in that: The second half cylinder (1.2) is arranged at the lower part of the cylinder (1), and a plurality of air jet openings (5) are provided on the second half cylinder (1.2).

6. The air layer drag reduction modular jet device according to claim 5, characterized in that: A plurality of the air jet openings (5) are arranged in parallel.

7. The air layer drag reduction modular jet device according to any one of claims 1 to 6, characterized in that: The driving mechanism (3) comprises a transmission assembly (3.1) and a motor (3.2) transmission-connected to the transmission assembly (3.1); the transmission assembly (3.1) comprises a worm wheel (3.11) and a worm (3.12); the worm wheel (3.11) is sleeved on a hollow shaft (2.3) at one end of a rotating cylinder (2) and fixedly connected thereto; the spiral tooth segment of the worm (3.12) meshes with the worm wheel (3.11); and the smooth rod segment of the worm (3.12) is transmission-connected to an output shaft of the motor (3.2) via a coupling (7).

8. The air layer drag reduction modular jet device according to claim 7, characterized in that: The transmission assembly (3.1) further comprises a housing (3.13), and the worm (3.12) is rotatably mounted in the housing (3.13) via a second bearing (8); A motor mounting seat (3.3) is also provided on the motor (3.2), and the motor mounting seat (3.3) is fixedly connected to the housing (3.13).

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