A multi-stage coupled drag-reducing agent particle rapid dissolution device, method and application

Abstract

This invention discloses a multi-stage coupled rapid dissolution device, method, and application for drag-reducing agent particles, belonging to the field of underwater drag reduction technology. The device includes a cylinder with a rotating shaft rotatably connected inside. An inlet and outlet are provided on the outer circumference of the cylinder for introducing water and outputting a polymer solution, respectively. The rotating shaft is driven to rotate by a power source, and multiple porous mesh-structured rotating cages are mounted axially on it. Baffles are provided between adjacent rotating cages, dividing the cylinder cavity into multiple independent dissolution units. Flow channels are formed on the baffles, and the positions of these channels are designed to maximize the flow path of the solution within the cylinder. The rotating cages contain drag-reducing agent particles. This invention achieves rapid, real-time preparation of polymer solutions while minimizing interference with navigation. It can quantitatively adjust the polymer solution concentration according to navigation speed and overcomes the problem of shear damage during polymer solution preparation in existing technologies.

Description

Technical Field

[0001] This invention belongs to the field of underwater drag reduction technology, specifically relating to a multi-stage coupled drag-reducing agent particle rapid dissolution device, method, and application. Background Technology

[0002] For objects moving underwater or on the water's surface, the resistance they experience during motion is far greater than the resistance encountered in air. Theoretically, underwater organisms or underwater vehicles experience approximately 800 times the resistance of air, with frictional resistance comprising the largest proportion of this resistance. Therefore, reducing energy consumption by minimizing the frictional resistance experienced by underwater vehicles and ships is of significant research importance.

[0003] Currently, known drag reduction technologies for underwater vehicles include wall heating, flexible walls, microbubble drag reduction, trench drag reduction, superhydrophobic drag reduction, and turbulent drag reduction using polymer additives. Other promising technologies include biomimetic drag reduction and drag-reducing coatings. Among these methods, polymer additives offer the most significant drag reduction effect. Only a small amount of polymer additive (a few ppm to tens of ppm, where ppm refers to parts per million) needs to be added to the turbulent flow. The long-chain structure of the additive effectively suppresses the turbulent structure, thereby significantly reducing frictional resistance and achieving a substantial drag reduction effect. For drag reduction using additive solutions within pipes, the additive needs to be dissolved throughout the entire flow field; therefore, this method is also known as the uniform solution drag reduction method. However, to meet the needs of external flow drag reduction, the method of spraying drag-reducing agent solutions onto the surface of ships and underwater vehicles has been proposed and proven effective. This method consumes less drag-reducing agent and is easy to implement.

[0004] Existing particulate material dissolving and stirring devices are used to solve the problems of slow dissolution and uneven stirring of particulate materials. However, these devices only rely on motor rotation for particle dissolution and mixing, and their dissolution tanks lack the function of agitating and stirring the raw materials. Existing technologies employ automatic, synchronous, up-and-down circulating agitation of the raw materials while stirring to achieve the purpose of agitation and stirring. While these technologies can achieve rapid polymer dissolution, the multiple sets of blades mounted on the rotating rod operate within the same cavity, failing to achieve multi-stage coupling between the blade sets. This limits further improvement in the polymer dissolution rate and cannot guarantee complete dissolution of the material.

[0005] Existing technologies disclose stirring devices for accelerating the complete dissolution and mixing of polyacrylamide particles. These devices employ an inclined installation of the stirring motor to increase the stirring space and force, thereby improving the dissolution efficiency of the polymer. During stirring, the dissolution intensity of the particles in contact with the solution is effectively increased, resulting in more uniform particle dissolution. However, the inclined installation of the motor and shaft increases rotational instability, making the main structure prone to vibration and swaying.

[0006] Existing polymer stretching and mass transfer integrated ultra-fast dissolution devices achieve rapid polymer dissolution through the combined action of forced stretching and ultra-gravity mass transfer. However, these devices contain multiple toothed disc structures, making them complex and difficult to install. Furthermore, the lack of spatial separation between multiple stretching repeating units results in the dissolved polymer being mixed within the same space, making it impossible to quantitatively determine the polymer solution concentration. Summary of the Invention

[0007] The technical problem to be solved:

[0008] To overcome the shortcomings of existing technologies, this invention provides a multi-stage coupled rapid dissolution device for drag-reducing agent particles. Multiple rotating cages are arranged within their respective independent dissolution units, which are connected by flow channels. A power source drives each cage to rotate within its unit, forming a multi-stage dissolution system for drag-reducing agent particles. This invention achieves rapid, real-time preparation of polymer solutions within the limited space of an underwater vehicle while minimizing interference with its navigation. It can quantitatively adjust the polymer solution concentration according to the navigation speed and overcomes the problem of shear damage during polymer solution preparation in existing technologies.

[0009] The technical solution of the present invention is: a multi-stage coupled drag-reducing agent particle rapid dissolution device, including a cylinder, a rotating shaft rotatably connected inside the cylinder, and an inlet and an outlet provided on the outer circumferential surface of the cylinder, for respectively introducing water and outputting polymer solution;

[0010] The rotating shaft is driven to rotate by a power source. Multiple porous mesh structure rotating cages are installed on it along the axial direction, and partitions are set between adjacent rotating cages. The partitions divide the inner cavity of the cylinder into multiple independent dissolution units. Flow channels are opened on the partitions, and the position of the flow channels of each partition is set to maximize the path of solution flow in the cylinder.

[0011] The rotating cage is filled with drag-reducing agent particles.

[0012] A further technical solution of the present invention is: pure water is introduced into the cylinder through the inlet, and the pure water fills each dissolving unit inside the cylinder.

[0013] A further technical solution of the present invention is: the partition is fitted onto the rotating shaft, and an eccentric circular hole is opened on its end face to serve as a flow channel between adjacent dissolving units.

[0014] A further technical solution of the present invention is that the eccentric circular holes of the adjacent partitions are arranged symmetrically along the central axis during installation, so that the solution takes the longest path when flowing in different dissolution units, ensuring that the drag-reducing agent particles are fully dissolved.

[0015] A further technical solution of the present invention is: the rotating cage is a hollow ring-shaped structure, its inner ring circumference is installed on the rotating shaft by a connecting key, and can rotate with the rotating shaft; its outer ring circumference and both end faces are porous mesh structures, the mesh size is smaller than the particle size of the drag-reducing agent particles, which confines the drag-reducing agent particles in the rotating cage. When the rotating cage rotates, the solution in the dissolving unit is repeatedly mixed with the drag-reducing agent particles and fully dissolved.

[0016] A further technical solution of the present invention is: a washer is fitted on the rotating shaft between adjacent partitions and the rotating cage to prevent the partitions from colliding and rubbing when the rotating cage rotates.

[0017] A further technical solution of the present invention is: the cylinder includes a cylinder with openings at both ends and sealing end caps sealed at both ends; the opening ends of multiple cylinders are sequentially and coaxially sealed together, which can expand the cylinder capacity, increase the axial length of the cylinder and the number of rotating cylinders; the number of cylinders can be increased or decreased according to the required amount of polymer solution, and it can be adapted to different aircraft.

[0018] A further technical solution of the present invention is: multiple cylinder sleeves are coaxially fitted on the inner wall of the cylinder to support the cylinder peripheral wall; the cylinder sleeves correspond one-to-one with the dissolution unit, and the cylinder sleeves located at the cylinder inlet / outlet are perforated cylinder sleeves, with the openings on them being opposite to the inlet / outlet positions and connecting the inside and outside of the cylinder cavity.

[0019] A method for rapid dissolution of multi-stage coupled drag-reducing agent particles, comprising the following steps:

[0020] Weigh the drag-reducing agent particles according to the required concentration of the polymer solution and put them into the rotating drum. Then adjust the cylinder installation length according to the number of rotating drums.

[0021] After installation, pure water is injected into the cylinder inlet through the pipe to fill the cylinder with water.

[0022] Start the power source to drive the shaft to rotate around the axis;

[0023] Adjust the shaft speed according to the required dissolution rate of the drag-reducing agent particles;

[0024] The dissolved polymer solution flows out from the cylinder outlet.

[0025] A multi-stage coupled drag-reducing agent particle rapid dissolution device is applied to underwater vehicles or ship hulls. The polymer solution obtained by the multi-stage coupled drag-reducing agent particle rapid dissolution device can reduce drag on the outer surface of the underwater vehicle or the bottom of the ship hull.

[0026] Beneficial effects

[0027] The beneficial effects of this invention are as follows: This invention proposes a multi-stage coupled rapid dissolution device for drag-reducing agent particles. A rotating drum containing drag-reducing agent particles is immersed in water within a dissolution unit. A motor drives the drum to rotate, allowing the drag-reducing agent particles to repeatedly mix with water within individual dissolution units, ensuring complete dissolution. The cylinder is axially arranged with multiple sets of rotating drums and dissolution units, and flow channels are formed on the partitions separating the dissolution units. The partitions and flow channels restrict the flow path of the solution within the cylinder, thus enabling more efficient and complete dissolution of the drag-reducing agent particles within the same cylinder volume.

[0028] The rotating cage described in this invention adopts a porous mesh structure, which allows the drag-reducing agent particles inside to mix with water almost without obstruction. The motor can accelerate the dissolution speed at low speed, thus reducing the energy consumption of the aircraft.

[0029] Because the rotating cage device in this invention has a porous mesh structure, its shape does not change abruptly, and it will not cause shear damage to the molecular chain length of the polymer during rotation; the liquid flows independently between stages, and the polymer solution concentration can be quantitatively configured; moreover, the cavity of the device is filled with liquid with a uniform density distribution, and the rotation of the cage will not generate eccentric force due to uneven particle distribution in the cage, nor will it drive the liquid in the cavity to rotate and generate rotational inertial force, so it has little interference with the navigation status of the underwater vehicle. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the external shape of the present invention.

[0031] Figure 2 This is a partial cross-sectional view of the present invention.

[0032] Figure 3 The internal structure shown after concealing cylinder 1.

[0033] Figure 4 This is a structural diagram of partition 3.

[0034] Figure 5 This is a partial cross-sectional view of the present invention presented in three dimensions.

[0035] Figure 6 This is a structural diagram of a multi-stage rotating drum device.

[0036] Figure 7 This is a curve showing the change in the concentration of the PEO solution.

[0037] Explanation of reference numerals in the attached diagrams: 1. Cylinder; 2. Inlet; 3. Baffle; 4. Outlet; 5. Sealing end cap; 6. Rotating shaft; 7. Servo motor; 8. Bearing; 9. End cap mounting hole; 10. Perforated cylinder liner; 11. Connecting key; 12. Non-perforated cylinder liner; 13. Washer; 14. Rotating drum end cap; 15. Rotating drum; 16. Concentration curve of the solution when the mass of PEO particles is 50 g; 17. Concentration curve of the solution when the mass of PEO particles is 100 g; 18. Concentration curve of the solution when the mass of PEO particles is 150 g. Detailed Implementation

[0038] The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0039] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0040] Existing filler dissolution devices are unsuitable for underwater vehicles due to their inability to fully dissolve drag-reducing particles or to quantitatively adjust the polymer solution concentration. This invention provides a multi-stage coupled rapid dissolution device and method for drag-reducing agent particles. The specific structure of this device is as follows:

[0041] The device includes a cylinder 1, an inlet 2, a partition 3, an outlet 4, a sealing end cap 5, a rotating shaft 6, a servo motor 7, a bearing 8, an end cap mounting hole 9, a perforated cylinder sleeve 10, a connecting key 11, a non-perforated cylinder sleeve 12, a gasket 13, a rotating cage end cap 14, and a rotating cage 15. The cylinder 1 has an inlet 2 and an outlet 4 on its side wall. Inlet 2 is for pure water; the device needs to be filled before use. The sealing end cap 5 is connected to the end face of the cylinder 1, and the sealing end cap 5 and the cylinder 1 are pressed together through the end cap mounting hole 9. The outlet 4 is a solution outlet; the polymer dissolves in water, forming a polymer solution of a certain concentration, which flows out through outlet 4. A perforated cylinder sleeve 10 and a non-perforated cylinder sleeve 12 are installed on the inner wall of the cylinder. The perforated cylinder sleeve 10 is installed at the head and tail of the cylinder 1, and has the following characteristics: The two functions are as follows: first, the holes on the side wall of the cylinder liner are aligned with the inlet 2 and outlet 4 respectively, to connect the inside and outside of the cylinder; second, the cylinder liner and cylinder are fitted with a clearance, providing axial support. The non-perforated cylinder liner 12 has no holes on its side wall and is installed in the middle section of the cylinder 1, mainly providing axial support for the partition 3. The partition 3 is pressed tightly against the cylinder liner, and the outer diameter of the partition 3 is the same as the outer ring size of the cylinder liner, used to divide the cylinder 1 into multiple dissolution units. An eccentric circular hole is opened on the partition 3, which serves as a flow channel. The passageway facilitates the flow of liquid between different dissolution units, and the eccentric holes of two adjacent partitions 3 are symmetrically arranged along the central axis during installation to ensure that the liquid takes the longest path when flowing in different storage chambers, guaranteeing more complete dissolution of the particles. Each storage chamber is equipped with an identical rotating cage 15 and rotating cage end cap 14. The rotating cage 15 has a porous mesh structure; after the polymer drag-reducing particles are placed inside, the rotating cage end cap 14 is used to cover it. The rotating cage structures with the rotating cage 15 and end cap 14 are then installed in different dissolution units. The rotating cage 15 is connected to the rotating shaft 6, and the rotating cage 15 is rotated by the rotating shaft 6. The connecting key 11 connects the rotating cage 15 to the rotating shaft 6 to prevent the rotating shaft 6 from slipping when rotating. The washer 13 separates two adjacent rotating cage devices, so that a certain gap is formed between the two adjacent rotating cages to avoid the end face of the rotating cage from rubbing against the partition plate 3 when rotating. There are two bearings 8, which are respectively installed at the bottom of the cylinder 1 and at the sealing end cover 5, to reduce the frictional resistance when the rotating shaft 6 drives the rotating cage to rotate. The servo motor 7 is connected to the rotating shaft 6 to provide speed and power output for the rotation of the rotating cage device.

[0042] This invention involves immersing a rotating drum containing drag-reducing agent particles in water within a dissolution unit. A motor drives the drum to rotate, causing the drag-reducing agent particles to repeatedly mix with water within a separate dissolution unit, ensuring complete dissolution. The cylinder is axially arranged with multiple rotating drums and dissolution units, and flow channels are formed on the partitions separating the dissolution units. The partitions and flow channels restrict the flow path of the solution within the cylinder, allowing for more efficient and complete dissolution of the drag-reducing agent particles within the same cylinder volume.

[0043] The above technical solution will be further explained below with reference to the accompanying drawings.

[0044] Example:

[0045] This embodiment discloses a multi-stage coupled drag-reducing agent particle rapid dissolution device, including a cylinder 1, an inlet 2, a partition 3, an outlet 4, a sealing end cap 5, a rotating shaft 6, a servo motor 7, a bearing 8, an end cap mounting hole 9, a perforated cylinder liner 10, a connecting key 11, a non-perforated cylinder liner 12, a gasket 13, a rotating cage end cap 14, and a rotating cage 15.

[0046] The cylinder 1 is a cylindrical structure with an outer diameter of 300 mm, a wall thickness of 10 mm, and a length of 485 mm. Two through holes with an outer diameter of 25 mm are drilled in the outer wall, forming the inlet 2 and outlet 4 of the device of this invention. The sealing end cap 5 has the same outer diameter as the cylinder 1, 300 mm, and a thickness of 10 mm. A through hole with a diameter of 30 mm is drilled in the center of the sealing end cap, through which the rotating shaft 6 can pass. One end of the cylindrical section of the cylinder 1 is sealed, while the other end forms an open structure. Eight threaded blind holes with a diameter of 6 mm and a depth of 25 mm are machined on the end face of the open structure, allowing the sealing end cap 5 to be installed at the open end face of the cylinder 1 via bolts to form a sealing structure.

[0047] The cylinder liners come in two structures: one is a perforated cylinder liner 10, installed at both ends of the cylinder barrel 1 in the axial direction, with a bore diameter of 25mm. During installation, the openings of the cylinder liner 10 must be aligned with the inlet 2 and outlet 4 respectively to ensure that the liquid in the storage chamber can flow out smoothly. The other is a non-perforated cylinder liner 12, installed in the middle part of the cylinder barrel 1, mainly serving as axial support. The outer diameter of the cylinder liner is the same as the inner diameter of the cylinder barrel 1, which is 280mm, and the wall thickness is 10mm. To facilitate the smooth removal of the cylinder liner from the cylinder barrel 1, the cylinder liner and the cylinder barrel 1 are fitted with a clearance fit.

[0048] The outer diameter of the partition 3 is the same as the inner diameter of the cylinder 1, which is 280mm. The partition 3 can be inserted between the cylinder liners to form multiple liquid storage chambers. A central hole and an eccentric circular hole are formed on the partition. The diameter of the central hole is 35mm, and the rotating shaft 6 passes through the central hole with a clearance fit. To facilitate liquid flow between different liquid storage chambers, the diameter of the eccentric circular hole is 30mm, and the eccentric distance is 105mm. During installation, the holes between adjacent partitions are symmetrically arranged along the central axis to maximize the liquid flow path between different liquid storage chambers, ensuring more complete particle dissolution.

[0049] The rotating cage device includes a rotating cage 15 and a rotating cage end cap 14. Both the rotating cage 15 and the rotating cage end cap 14 are porous mesh structures with a pore size of 100 mesh. The multi-stage rotating cage structure is composed of four independent rotating cage structures.

[0050] The rotating shaft 6 has a circular cross-section with a diameter of 30mm and a length of 540mm. A connecting key 11 with dimensions of 10mm in length, 3mm in width, and 2.5mm in depth is installed on the rotating shaft 6 to prevent the rotating cage device from slipping when the rotating shaft 6 rotates.

[0051] The washer 13 is annular in shape, with an inner diameter of 30mm, an outer diameter of 35mm, and a length of 15mm. It is installed between two adjacent rotating cage devices. The washer 13 passes through the central hole of the partition plate 3 and is fitted with clearance.

[0052] The outer diameter of the sealing end cap 5 is the same as that of the cylinder 1, which is 300mm. The diameter of the central hole is 30mm. The rotating shaft 6 passes through the central hole on the sealing end cap 5 and is sealed with a skeleton oil seal ring. Eight through holes with a diameter of 6mm are evenly distributed along the circumference on the end face of the sealing end cap 5. The distance from each through hole to the center of the end cap is 145mm. The sealing end cap 5 and the cylinder 1 can be pressed together by bolts to form a sealed space.

[0053] The specific steps of the rapid dissolution method for multi-stage coupled drag-reducing agent particles in this embodiment are as follows:

[0054] Weigh the drag-reducing agent particles according to the required concentration of the polymer solution and put them into the rotating cage 15. Then adjust the installation length of the cylinder 1 according to the number of rotating cages 15.

[0055] After installation, pure water is injected into cylinder inlet 2 through the pipe, so that cylinder 1 is filled with water;

[0056] Start the servo motor 7 to drive the rotating shaft 6 to rotate around the axis;

[0057] Adjust the rotation speed of shaft 6 according to the required dissolution rate of the drag-reducing agent particles;

[0058] The dissolved polymer solution flows out from cylinder outlet 4 to reduce drag on the vehicle.

[0059] To test the effectiveness of the device in this invention, the polymer drag-reducing particles used in this embodiment are made of polyethylene oxide (PEO) with a molecular weight of 8 million and an average particle size of 5 mm. A certain mass of PEO drag-reducing particles is placed in each rotating drum, and the spray flow rate is fixed at 100 mL / s. The PEO drag-reducing particles are placed in the device of this invention, and the dissolution of PEO particles under different rotation speeds and particle masses is tested by adding different masses of PEO particles and setting different rotation speeds. During the test, tap water is introduced into inlet 2 and fills the entire storage chamber. The viscosity of the PEO solution at outlet 4 is measured to obtain the mass concentration of the PEO solution. When testing the multi-stage coupled drag-reducing agent particle rapid dissolution device of this invention, the rotation speed of the rotating drum varies between 0-200 r / min, increasing by 20 r / min each time. The mass of PEO drag-reducing particles placed in each rotating drum varies between 50-150 grams, increasing by 50 grams each time.

[0060] The obtained PEO solution concentration change curve is as follows: Figure 7 As shown. From Figure 7 It can be seen that, with a fixed injection flow rate of 100 mL / s, the multi-stage coupled drag-reducing agent particle rapid dissolution device of the present invention can achieve rapid real-time preparation of PEO solution with a concentration of up to nearly 100 ppm, indicating that the PEO particles are fully dissolved in a short time. The concentration of the PEO solution increases with increasing rotation speed. At low rotation speeds (40-120 r / min), the solution concentration increases rapidly, while at high rotation speeds (120-200 r / min), increasing the rotation speed has a reduced effect on accelerating the dissolution of PEO particles. In practical applications, the corresponding PEO solution concentration can be obtained simply by changing the rotation speed and the mass of the drag-reducing PEO particles in the rotating drum device, thus realizing the quantitative preparation of PEO solution.

[0061] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A method for rapidly dissolving drag-reducing agent particles using a multi-stage coupled rapid dissolution device, characterized in that... The specific steps are as follows: Weigh the drag-reducing agent particles according to the required concentration of the polymer solution and put them into the rotating drum. Then adjust the cylinder installation length according to the number of rotating drums. After installation, pure water is injected into the cylinder inlet through the pipe to fill the cylinder with water. Start the power source to drive the shaft to rotate around the axis; Adjust the shaft speed according to the required dissolution rate of the drag-reducing agent particles; The dissolved polymer solution flows out from the cylinder outlet; The multi-stage coupled drag-reducing agent particle rapid dissolution device includes a cylinder with a rotating shaft rotatably connected inside it, and an inlet and an outlet are provided on its outer circumference surface for introducing water and outputting polymer solution, respectively. The rotating shaft is driven to rotate by a power source. Multiple porous mesh structure rotating cages are installed on it along the axial direction, and partitions are set between adjacent rotating cages. The partitions divide the inner cavity of the cylinder into multiple independent dissolution units. Flow channels are opened on the partitions, and the position of the flow channels of each partition is set to maximize the path of solution flow in the cylinder. The rotating cage is filled with drag-reducing agent particles.

2. The method for rapidly dissolving drag-reducing agent particles using a multi-stage coupled drag-reducing agent particle rapid dissolution device according to claim 1, characterized in that: The cylinder is supplied with pure water through an inlet, which fills each dissolving unit inside the cylinder.

3. The method for rapidly dissolving drag-reducing agent particles using a multi-stage coupled rapid dissolution device according to claim 1, characterized in that: The partition is fitted onto the rotating shaft, and an eccentric circular hole is opened on its end face to serve as a flow channel between adjacent dissolving units.

4. The method for rapidly dissolving drag-reducing agent particles using a multi-stage coupled rapid dissolution device according to claim 3, characterized in that: When the eccentric circular holes of the adjacent partitions are installed, they are arranged symmetrically along the central axis, so that the solution takes the longest path when flowing in different dissolution units, ensuring that the drag-reducing agent particles are fully dissolved.

5. The method for rapidly dissolving drag-reducing agent particles using a multi-stage coupled rapid dissolution device according to claim 1, characterized in that: The rotating cage is a hollow ring-shaped structure. Its inner ring circumference is installed on the rotating shaft by a connecting key and can rotate with the rotating shaft. Its outer ring circumference and two end faces are porous mesh structures with mesh diameter smaller than the particle size of the drag-reducing agent particles, which confines the drag-reducing agent particles inside the rotating cage. When the rotating cage rotates, the solution in the dissolving unit is repeatedly mixed with the drag-reducing agent particles and fully dissolved.

6. The method for rapidly dissolving drag-reducing agent particles using a multi-stage coupled rapid dissolution device according to claim 5, characterized in that: Washers are fitted on the shaft between adjacent partitions and the rotating cage to prevent the partitions from colliding and rubbing against each other when the rotating cage rotates.

7. The method for rapidly dissolving drag-reducing agent particles using a multi-stage coupled rapid dissolution device according to claim 1, characterized in that: The cylinder includes a cylinder with openings at both ends and sealed end caps sealed at both ends; the open ends of multiple cylinders are sequentially and coaxially sealed together, which can expand the cylinder capacity, increase the axial length of the cylinder and the number of rotating cylinders; the number of cylinders can be increased or decreased according to the required amount of polymer solution, and it can be adapted to different aircraft.

8. The method for rapidly dissolving drag-reducing agent particles using a multi-stage coupled rapid dissolution device according to claim 1, characterized in that: Multiple cylinder sleeves are coaxially fitted on the inner wall of the cylinder to support the cylinder circumference. Each cylinder sleeve corresponds to a dissolution unit. The cylinder sleeve located at the cylinder inlet / outlet is a perforated cylinder sleeve, with the opening on it opposite to the inlet / outlet position, connecting the inside and outside of the cylinder cavity.

9. A method for rapidly dissolving drag-reducing agent particles using a multi-stage coupled drag-reducing agent particle rapid dissolution device is applied to underwater vehicles or ship hulls. The polymer solution obtained by the method described in any one of claims 1-8 using the multi-stage coupled drag-reducing agent particle rapid dissolution device can reduce drag on the outer surface of the underwater vehicle or the bottom of the ship hull.

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