Marine propeller, ship, and control method for marine propeller

Abstract

Provided are a marine propeller (100), a ship (200), and a control method of the marine propeller (100). The marine propeller (100) comprises a frame (1) provided with an underwater suspension part (11) provided with a driving rotating shaft (12); a propeller (2) connected with the driving rotating shaft (12); and a guide pipe (3) connected with the frame (1), at least a part of the guide pipe (3) being movable relative to the propeller (2) to assume a guide form or an open form. When the guide pipe (3) assumes the guide form, the guide pipe (3) is arranged around the propeller (2) and coaxially with the propeller (2). When the guide pipe (3) assumes the open form, the guide pipe (3) is located on the water surface and at least partially forms a pressure wave structure. By arranging the guide pipe (3) movable relative to the propeller (2), the guide pipe (3) can adjust the position according to the rotating speed of different propellers (2) to form the guide form and the open form, so that the propelling structure can quickly switch between the guide pipe propeller and the common propeller, thereby enabling the marine propeller (100) to timely match different load conditions and greatly improving the propelling efficiency of the marine propeller (100).

Description

Technical Field

[0001] This application relates to the field of marine equipment technology, and more specifically, to marine propulsion, ships, and control methods for marine propulsion. Background Technology

[0002] In the field of propellers propelled by fluids (air, water, other fluids, etc.), the hydrodynamic performance of the propeller is closely related to its form. Using different types of propellers under varying load conditions can improve the propulsion efficiency of a vessel. Given the diverse load conditions of ships, finding a suitable propeller for various load scenarios is a pressing issue that needs to be addressed. Summary of the Invention

[0003] This application provides a marine propulsion system, a ship, and a control method for the marine propulsion system to solve the aforementioned technical problems.

[0004] An embodiment of this application provides a marine propulsion device, comprising:

[0005] The frame is equipped with an underwater suspension part, and the underwater suspension part is equipped with a drive shaft;

[0006] The propeller is connected to the drive shaft;

[0007] A duct, connected to the frame, at least a portion of which is movable relative to the propeller to present a flow-guiding or open form; when the duct is in the flow-guiding form, the duct surrounds the propeller and is coaxially arranged with the propeller; when the duct is in the open form, the duct is located on the water surface and at least a portion forms a wave-pressure structure.

[0008] An embodiment of this application also provides a ship, including a hull and a marine propulsion device as described in the above embodiments, wherein the marine propulsion device is disposed at the stern end of the hull.

[0009] Embodiments of this application also provide a control method for a marine propulsion system, comprising:

[0010] Detect the rotational speed of the propeller;

[0011] Once the propeller's rotation speed is confirmed to meet the first preset threshold, the duct is controlled to be in a flow guiding mode.

[0012] Once the propeller's rotation speed is confirmed to meet the second preset threshold, the control duct is kept in an open state.

[0013] The marine propeller, ship, and control method of the present application embodiment are achieved by setting a duct that can move relative to the propeller. The duct can adjust its position according to the rotational speed of different propellers to form a guiding shape and an open shape, so that the propulsion structure can quickly switch between the duct propeller and the ordinary propeller. This allows the marine propeller to match different load conditions in a timely manner, greatly improving the propulsion efficiency of the marine propeller. At the same time, the deformation structure of the duct is simple, which helps to reduce production modification and maintenance costs. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of a marine propulsion device according to an embodiment of this application.

[0016] Figure 2 Propulsion performance curves for large-pitch conventional propellers, small-pitch conventional propellers, and large-pitch conventional propellers with added duct structures.

[0017] Figure 3 This is a simplified structural diagram of the marine propulsion system in the first embodiment.

[0018] Figure 4 This is a schematic diagram of the structure of the marine propulsion system in the second embodiment.

[0019] Figure 5 for Figure 3 The diagram shows the changing states of a marine propulsion system.

[0020] Figure 6 for Figure 3 The diagram shows another variation of the marine propulsion system.

[0021] Figure 7 This is a schematic diagram of the structure of the marine propulsion system in the third embodiment.

[0022] Figure 8 This is a schematic diagram of the structure of the marine propulsion system in the fourth embodiment.

[0023] Figure 9 This is a schematic diagram of the structure of the marine propulsion system in the fifth embodiment.

[0024] Figure 10 This is a schematic diagram of the marine propulsion system in the sixth embodiment.

[0025] Figure 11This is a schematic diagram of the marine propulsion system in the seventh embodiment.

[0026] Figure 12 This is a schematic diagram of the structure of the marine propulsion system in the eighth embodiment.

[0027] Figure 13 for Figure 12 The diagram shows a simplified structural diagram of the first drive assembly in a marine propulsion system.

[0028] Figure 14 for Figure 13 The diagram shows a simplified structural diagram of the first power unit in the first drive assembly.

[0029] Figure 15 for Figure 13 A simplified structural diagram of the first power unit in another embodiment of the first drive assembly shown.

[0030] Figure 16 for Figure 13 A simplified structural diagram of the second power unit in the first drive assembly is shown.

[0031] Figure 17 for Figure 13 A simplified structural diagram of the second power unit in another embodiment of the first drive assembly shown.

[0032] Figure 18 This is a schematic diagram of the structure of the marine propulsion system in the ninth embodiment.

[0033] Figure 19 for Figure 18 A simplified structural diagram of the second drive assembly of the marine propulsion system.

[0034] Figure 20 for Figure 19 The diagram shows a simplified structural diagram of the third power unit in the second drive assembly.

[0035] Figure 21 for Figure 19 A simplified structural diagram of the third power unit in another embodiment of the second drive assembly shown.

[0036] Figure 22 This is a schematic diagram of the structure of the marine propulsion system in the tenth embodiment.

[0037] Figure 23 This is a structural block diagram of a marine propulsion system in one embodiment.

[0038] Figure 24 This is a simplified structural diagram of a ship in one embodiment.

[0039] Figure 25 This is a structural block diagram of a ship in one embodiment.

[0040] Figure 26 The flowchart shows a control method for a marine propulsion system in one embodiment.

[0041] Explanation of key component symbols:

[0042] Marine propulsion unit 100, frame 1, underwater suspension 11, drive shaft 12, propeller 2, duct 3, fixed structure 31, flow guiding structure 32, first structural component 33, second structural component 34, third structural component 35, fourth structural component 36, movable structure 37, adapter 4, first drive assembly 5, first power unit 51, first motor 511, first lead screw 512, first nut 513, first gear 514, first rack 515, second power unit 52, second motor 521, second lead screw 522, second nut 523, second gear 524, second rack 525, first bracket 53, second bracket 63, second drive assembly 6, third power group 61, third motor 611, third lead screw 612, third nut 613, third gear 614, third rack 615, fourth power group 62, flip bracket 7, flip shaft 71, rotation drive component 8, detection device 91, control device 92, ship 200, hull 201, motor 202, controller 203, driver 204. Detailed Implementation

[0043] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0044] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. When a component is said to be "set on" another component, it can be directly set on the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0046] Some embodiments of this application are described in detail. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0047] Please see Figure 1 This application provides a marine propulsion device 100, including a frame 1, a propeller 2, and a duct 3. The frame 1 has an underwater suspension portion 11, which also has a drive shaft 12, and the propeller 2 is connected to the drive shaft 12. The duct 3 is connected to the frame 1, and at least a portion of the duct 3 is movable relative to the propeller 2 to present a flow-guiding configuration or an open configuration. When the duct 3 is in the flow-guiding configuration, it surrounds the propeller 2 and is coaxially arranged with the propeller 2. When the duct 3 is in the open configuration, it is located on the water surface and at least a portion forms a wave-damping structure.

[0048] Specifically, when the rotational speed of propeller 2 is at a first preset threshold, the duct 3 is in a guiding state. The duct 3, coaxially arranged with propeller 2, can increase the thrust of propeller 2, adapting to situations where the vessel's load is relatively large. In other words, when the duct 3 is in a guiding state, it is suitable for situations where the vessel's draft is relatively deep. When the rotational speed of propeller 2 is at a second preset threshold, which is greater than the first preset threshold, the duct 3 is in an open state. This satisfies the requirement that when the vessel's load is relatively small, i.e., when the duct 3 is in an open state, it is suitable for situations where the vessel's draft is relatively shallow. Furthermore, the duct 3 moving to the water surface and partially serving as a wave-damping structure helps reduce drag.

[0049] Understandably, in the outboard motor propulsion market, to achieve product standardization, outboard motors are typically sold in series with varying power outputs. Users then choose the appropriate power source based on their vessel type and required navigation conditions. Different users and different application scenarios will have different priorities when selecting outboard motors. Therefore, the same model of outboard motor may be used on vessels of different sizes. Using a single type of propeller to match the different load conditions of different vessels can easily lead to wasted or insufficient propulsion power. Given the diverse load conditions of vessels, how to match marine propulsion systems 100 with various load conditions has become an urgent problem to be solved.

[0050] Currently, for outboard motor products such as propellers, one traditional approach to adapt to various vessel requirements is to select the vessel type and load capacity with the highest matching load as the rated value and design a matching propeller type. For other load capacities, this necessitates compromising and reducing propulsion efficiency. Another traditional approach is to achieve load capacity matching by replacing different types of propellers, but this leads to difficulties in use and increased costs.

[0051] Please see Figure 2 , Figure 2The diagram shows the propulsion performance curves of a large-pitch conventional propeller, a small-pitch conventional propeller, and a large-pitch conventional propeller with added duct structures under the conditions of 30kW input power and 1500rpm rated speed. Comparing the curves, it can be seen that the large-pitch propeller and the large-pitch conventional propeller with added ducts completely cover the design of the small-pitch conventional propeller along the entire propulsion performance curve. The marine propeller 100 of this application embodiment, by setting a duct 3 that can move relative to the propeller 2, allows the duct 3 to adjust its position according to different propeller speeds to form a guiding shape and an open shape, enabling the propulsion structure to quickly switch between a ducted propeller and a conventional propeller. This allows the marine propeller 100 to adapt to different load conditions in a timely manner, significantly improving the propulsion efficiency of the marine propeller 100. At the same time, the deformation structure of the duct 3 is simple, which helps to reduce production modification and maintenance costs.

[0052] The structure of the marine propulsion 100 of this application will be described in detail below with reference to specific embodiments.

[0053] First Embodiment

[0054] Please see Figure 3 In the first embodiment, the marine propulsion unit 100 includes a frame 1, a propeller 2, and a duct 3. The frame 1 has an underwater suspension portion 11, which also has a drive shaft 12, to which the propeller 2 is connected. The duct 3 is connected to the frame 1, and at least a portion of the duct 3 is movable relative to the propeller 2 to present a flow-guiding configuration or an open configuration. When the duct 3 is in the flow-guiding configuration, it surrounds the propeller 2 and is coaxially arranged with the propeller 2. When the duct 3 is in the open configuration, it is located above the water surface and at least a portion forms a wave-damping structure.

[0055] Specifically, the duct 3 includes a flow guiding structure 32 and a fixed structure 31. The fixed structure 31 is fixedly connected to the frame 1. One end of the flow guiding structure 32 is rotatably connected to one end of the fixed structure 31, and the other end of the flow guiding structure 32 is detachably connected to the other end of the fixed structure 31. When the rotational speed of the propeller 2 is at a first preset threshold, the duct 3 is in a flow guiding state. The flow guiding structure 32 can be spliced ​​with the fixed structure 31 and arranged around the propeller 2, so that the flow guiding structure 32 and the fixed structure 31 are spliced ​​into a ring structure, thereby forming a ducted propeller with the propeller 2 and improving the propulsion efficiency of the marine propeller 100 under high load conditions. The splicing methods of the flow guiding structure 32 and the fixed structure 31 include, but are not limited to, snap-fit ​​connection, magnetic connection, sleeve connection, and protrusion-groove mating connection. When the propeller 2 rotates at the second preset threshold, the duct 3 is in an open state. The flow guiding structure 32 can rotate relative to the fixed structure 31 under the action of power equipment such as motors and hydraulic components, so that the splicing end of the flow guiding structure 32 and the fixed structure 31 is separated. The flow guiding structure 32 continues to rotate around the end of the fixed structure 31 until it folds over to the side of the fixed structure 31 away from the propeller 2. The duct 3, which has completed the deformation action, is located on the water surface. The fixed structure 31 forms the wave-pressure structure, which reduces the resistance of the flow guiding structure 32 underwater and improves the propulsion efficiency of the marine propulsion unit 100 under low load conditions.

[0056] Second Embodiment

[0057] Please see Figure 4 , Figure 5 and Figure 6 The marine propulsion 100 of the second embodiment is largely the same as that of the first embodiment, except that the flow guiding structure 32 of the second embodiment includes a first structural member 33 and a second structural member 34, and the duct 3 is generally a three-section structure. The first structural member 33 and the second structural member 34 are rotatably connected to the two ends of the fixed structure 31, and the first structural member 33 and the second structural member 34 are detachably connected.

[0058] Specifically, the rotation axes of the first structural member 33 and the second structural member 34 are both parallel to the axis of the propeller 2. The first structural member 33 and the second structural member 34 can be flipped relative to the fixed structure 31 to be in an unfolded state, or they can be in a mutually unfolded state or a back-to-back state. The first structural member 33 and the second structural member 34 can also be flipped relative to the fixed structure 31 to be in a closed state, and the first structural member 33 and the second structural member 34 are also closed. When the duct 3 is in the flow-guiding mode, the first structural member 33 and the second structural member 34 rotate toward the propeller 2. The first structural member 33, the second structural member 34, and the fixed structure 31 sequentially close and splice together, surrounding the propeller 2 to form a duct-type propeller structure, thereby increasing the thrust of the propeller 2. In the embodiments of this application, when the first structural member 33, the second structural member 34, and the fixing structure 31 are assembled into a ring structure, the ends of the first structural member 33 and the second structural member 34 connected to the fixing structure 31 respectively pair with the two ends of the fixing structure 31 during rotation, and the connection is positioned by means of snap-fit ​​connection, magnetic connection, sleeve connection, or protrusion-groove mating connection. The ends of the first structural member 33 and the second structural member 34 away from the fixing structure 31 pair during the partial rotation of the conduit 3, and the connection is also positioned by means of snap-fit ​​connection, magnetic connection, sleeve connection, or protrusion-groove mating connection. When the duct 3 is in the open state, the first structural member 33 and the second structural member 34 fold down to the side of the fixed structure 31 away from the propeller 2. The first structural member 33 is disconnected from the second structural member 34, and both the first structural member 33 and the second structural member 34 are deployed relative to the fixed structure 31. This avoids the first structural member 33 and the second structural member 34 being underwater, thus avoiding the propulsion resistance they bring and improving propulsion efficiency to suit situations where the vessel has a low load capacity. The first structural member 33 and the second structural member 34 can be manually flipped relative to the fixed structure 31, or a power device can be installed on the fixed structure 31 to drive the first structural member 33 and the second structural member 34 to flip relative to the fixed structure 31. This power device can be a motor, a hydraulic cylinder, an electromagnetic module, or other similar devices.

[0059] In the embodiments of this application, the first structural member 33, the second structural member 34 and the fixed structure 31 are arc-shaped tubular structures, and each is part of a complete circular structure. The arc lengths of the first structural member 33 and the second structural member 34 are greater than or equal to the arc length of the fixed structure 31, which helps to reduce the arc height of the fixed structure 31, thereby reducing the distance between the highest position of the fixed structure 31 and the water surface when used as a wave deflector, and improving the wave deflection effect.

[0060] Furthermore, the fixing structure 31 of the duct 3 can also be moved up or down along the frame 1 to adjust the gap between the fixing structure 31 and the propeller 2, in order to solve the problem of uneven force on the propeller 2 caused by eddy current impact on the fixing structure 31, improve the efficiency of the propeller 2 and reduce the vibration of the propeller 2.

[0061] Specifically, the fixed structure 31 can be directly slidably connected to the frame 1 and slide relative to the frame 1 under the drive of the power mechanism. The power mechanism can be a motor, an electromagnetic module, or a hydraulic cylinder, etc. The fixed structure 31 can also be fixed to a slider, which slidably connects to the frame 1, thereby driving the fixed structure 31 to slide relative to the frame 1. The sliding direction of the fixed structure 31 relative to the frame 1 is perpendicular to the axis of the propeller 2, and when the marine propeller 100 is operating normally, the fixed structure 31 can slide perpendicularly to the water surface relative to the frame 1.

[0062] Third Embodiment

[0063] Please see Figure 7 The marine propulsion 100 of the third embodiment is largely the same as that of the second embodiment, except that the flow guiding structure 32 of the third embodiment further includes a third structural member 35 and a fourth structural member 36, and the duct 3 is generally a five-segment structure. The third structural member 35 is rotatably connected to the first structural member 33, and the fourth structural member 36 is rotatably connected to the second structural member 34, and the third structural member 35 and the fourth structural member 36 are detachably connected.

[0064] Specifically, the rotation axes of the third structural member 35 and the fourth structural member 36 are both parallel to the rotation axis of the propeller 2. The third structural member 35 and the fourth structural member 36 can be flipped relative to the first structural member 33 and the second structural member 34 to be in an unfolded state, or they can be unfolded towards each other, or folded to the side of the first structural member 33 and the second structural member 34 away from the propeller 2. The third structural member 35 and the fourth structural member 36 can also be flipped relative to the first structural member 33 and the second structural member 34 to be in a closed state, and they can also be closed together.

[0065] The third structural component 35 and the fourth structural component 36 can be flipped manually, or they can be flipped by using power devices installed on the first structural component 33 and the second structural component 34. These power devices include, but are not limited to, motors, hydraulic components, electromagnetic modules, and other similar devices.

[0066] When the conduit 3 is in the flow guiding mode, the fixed structure 31, the first structural member 33, the third structural member 35, the fourth structural member 36, and the second structural member 34 can be sequentially spliced ​​together to form a ring structure that surrounds the propeller 2. Specifically, when the fixed structure 31, the first structural member 33, the third structural member 35, the second structural member 34, and the fourth structural member 36 are spliced ​​together to form a ring structure, the first structural member 33 and the second structural member 34 first rotate around the end of the fixed structure 31 toward the propeller 2. During the rotation, the ends of the first structural member 33 and the second structural member 34 respectively pair with the two ends of the fixed structure 31, and the connection is positioned by means of snap-fit ​​connection, magnetic connection, sleeve connection, and protrusion-groove mating connection. Next, the third structural member 35 and the fourth structural member 36 rotate around the ends of the first structural member 33 and the second structural member 34, respectively, so that the connecting end of the third structural member 35 is paired and connected with the connecting end of the first structural member 33, and the connecting end of the fourth structural member 36 is paired and connected with the connecting end of the second structural member 34. At the same time, the end of the third structural member 35 away from the first structural member 33 is paired and connected with the end of the fourth structural member 36 away from the second structural member 34. The first structural member 33, the second structural member 34, the third structural member 35, and the fourth structural member 36 can also be positioned at the connection points through snap-fit ​​connection, magnetic connection, sleeve connection, or protrusion-groove mating connection.

[0067] When the duct 3 is in the open state, the third structural member 35 and the fourth structural member 36 rotate to the side of the first structural member 33 and the second structural member 34 opposite to the propeller 2, respectively. The first structural member 33 and the second structural member 34 then carry the third structural member 35 and the fourth structural member 36 to the side of the fixed structure 31 opposite to the propeller 2. Compared with the three-section structure of the duct 3, the five-section structure of the duct 3 is beneficial to reducing the space occupied by the flow guiding structure 32 after it is folded.

[0068] Fourth embodiment

[0069] Please see Figure 8 The marine propulsion unit 100 of the fourth embodiment includes a frame 1, a propeller 2, and a duct 3. The frame 1 has an underwater suspension portion 11, which also has a drive shaft 12, to which the propeller 2 is connected. The duct 3 is connected to the frame 1, and at least a portion of the duct 3 is movable relative to the propeller 2 to present a flow-guiding configuration or an open configuration. When the duct 3 is in the flow-guiding configuration, it surrounds the propeller 2 and is coaxially arranged with the propeller 2. When the duct 3 is in the open configuration, it is located above the water surface and at least a portion forms a wave-damping structure.

[0070] Specifically, the duct 3 includes a flow-guiding structure 32 and a fixed structure 31. The fixed structure 31 is connected to the frame 1, and the flow-guiding structure 32 is retractably connected to the fixed structure 31. When the propeller 2's rotational speed is at a first preset threshold, the duct 3 is in a flow-guiding state, and the flow-guiding structure 32 extends relative to the fixed structure 31, so that the flow-guiding structure 32 and the fixed structure 31 are spliced ​​into a ring structure, thus forming a ducted propeller with the propeller 2, improving the propulsion efficiency of the marine propulsion unit 100 under high load conditions. The connection forms between the flow-guiding structure 32 and the fixed structure 31 include, but are not limited to, snap-fit ​​connection, magnetic connection, sleeve connection, and protrusion-groove mating connection. When the propeller 2's rotational speed is at a second preset threshold, the duct 3 is in an open state, and the flow-guiding structure 32 contracts relative to the fixed structure 31. The fixed structure 31 forms a wave-compressing structure, reducing the underwater resistance of the flow-guiding structure 32 and improving the propulsion efficiency of the marine propulsion unit 100 under low load conditions.

[0071] In this embodiment, the flow guiding structure 32 can retract into the inner cavity of the fixed structure 31. It is understood that in other embodiments, the flow guiding structure 32 can also retract to the outer side of the fixed structure 31, forming a stacked state between the flow guiding structure 32 and the fixed structure 31. Setting the conduit 3 as a telescopic structure helps to further reduce the space occupied by the conduit 3 when it deforms.

[0072] The flow guiding structure 32 can be driven to contract or extend by a power device installed on the fixed structure 31. This power device includes, but is not limited to, a motor, a hydraulic assembly, an electromagnetic module, and other similar devices.

[0073] Fifth Embodiment

[0074] Please see Figure 9The marine propeller 100 of the fifth embodiment is largely the same as that of the fourth embodiment, except that the flow guiding structure 32 of the fifth embodiment includes a first structural member 33 and a second structural member 34, which are retractably connected to both ends of the fixed structure 31. When the duct 3 is in the flow guiding mode, the first structural member 33 and the second structural member 34 extend relative to the fixed structure 31 and surround the propeller 2, so that the flow guiding structure 32 and the fixed structure 31 form a complete annular structure, thereby guiding the propeller 2. Specifically, the first structural member 33 and the second structural member 34 extend outward from both ends of the fixed structure 31 until the ends of the first structural member 33 and the second structural member 34 are paired and connected to each other, so that the flow guiding structure 32 and the fixed structure 31 form a complete annular structure. The connection method includes, but is not limited to, snap-fit ​​connection, magnetic connection, sleeve connection, and protrusion-groove mating connection. When the duct 3 is in the open state, the first structural member 33 and the second structural member 34 contract relative to the two ends of the fixed structure 31, respectively. The first structural member 33 and the second structural member 34 move into the inner cavity of the fixed structure 31, or move to the side of the fixed structure 31 away from the propeller 2. The open duct 3 can move to the water surface, and the fixed structure 31 forms a wave-damping structure.

[0075] The first structural member 33 and the second structural member 34 can be driven to retract or extend by a power device installed on the fixed structure 31. This power device includes, but is not limited to, motors, hydraulic components, electromagnetic modules, and other similar devices.

[0076] In the embodiments of this application, the first structural member 33, the second structural member 34 and the fixed structure 31 are arc-shaped tubular structures, and the arc lengths of the first structural member 33 and the second structural member 34 are greater than or equal to the arc length of the fixed structure 31, which helps to reduce the arc height of the fixed structure 31, thereby reducing the distance between the highest position of the fixed structure 31 and the water surface when used as a wave deflector, and improving the wave deflection effect.

[0077] Sixth Embodiment

[0078] Please see Figure 10 The marine propulsion 100 of the sixth embodiment is largely the same as that of the fifth embodiment, except that the flow guiding structure 32 of the sixth embodiment further includes a third structural member 35 and a fourth structural member 36. The third structural member 35 is retractably connected to the first structural member 33, and the fourth structural member 36 is retractably connected to the second structural member 34.

[0079] When the conduit 3 is in the flow guiding mode, specifically, the first structural member 33 and the second structural member 34 extend outward from both ends of the fixed structure 31, the third structural member 35 extends outward from the end of the first structural member 33 away from the fixed structure 31, and the fourth structural member 36 extends outward from the end of the second structural member 34 away from the fixed structure 31. The ends of the fourth structural member 36 and the third structural member 35 are paired and connected, so that the flow guiding structure 32 and the fixed structure 31 form a complete annular structure and are arranged around the periphery of the propeller 2.

[0080] When the conduit 3 is in the open state, the third structural member 35 and the fourth structural member 36 contract relative to the first structural member 33 and the second structural member 34, respectively, and the first structural member 33 and the second structural member 34 also contract relative to the fixed structure 31. Compared with the three-segment telescopic conduit 3 structure in the fifth embodiment, the five-segment telescopic conduit 3 structure in the sixth embodiment can reduce the length of the flow guiding structure 32 extending beyond the end of the fixed structure 31 when the conduit 3 is in the open state, thereby reducing the impact of the flow guiding structure 32 on the wave-suppressing effect of the fixed structure 31.

[0081] Seventh Embodiment

[0082] Please see Figure 11 The seventh embodiment of the marine propulsion unit 100 includes a frame 1, a propeller 2, and a duct 3. The frame 1 has an underwater suspension portion 11, which also has a drive shaft 12, to which the propeller 2 is connected. The duct 3 is connected to the frame 1, and at least a portion of the duct 3 is movable relative to the propeller 2 to present a flow-guiding configuration or an open configuration. When the duct 3 is in the flow-guiding configuration, it surrounds the propeller 2 and is coaxially arranged with the propeller 2. When the duct 3 is in the open configuration, it is located above the water surface and at least a portion forms a wave-damping structure.

[0083] Specifically, the duct 3 includes a flow guiding structure 32, a fixed structure 31, and a movable structure 37. The fixed structure 31 is fixedly connected to the frame 1, and the movable structure 37 is rotatably connected between the flow guiding structure 32 and the fixed structure 31. When the rotational speed of the propeller 2 is at a first preset threshold, the duct 3 is in a flow guiding state. The movable structure 37 drives the flow guiding structure 32 to rotate along the axial direction of the duct 3 towards the propeller 2. The fixed structure 31 and the flow guiding structure 32 can be spliced ​​into a ring structure to form a ducted propeller with the propeller 2, thereby improving the propulsion efficiency of the marine propulsion unit 100 under high load conditions. The connection methods between the fixed structure 31 and the flow guiding structure 32 include, but are not limited to, snap-fit ​​connection, magnetic connection, and protrusion-groove mating connection. When the rotational speed of propeller 2 is at the second preset threshold, duct 3 is in an open state. Movable structure 37 drives flow guiding structure 32 to flip along the axial direction of duct 3 and toward the extension direction of frame 1 to the side of fixed structure 31 away from propeller 2. At this time, duct 3 is located on the water surface, fixed structure 31 forms a wave-suppressing structure, and reduces the resistance of flow guiding structure 32 underwater, thereby improving the propulsion efficiency of marine propulsion 100 under low load conditions.

[0084] Eighth embodiment

[0085] Please see Figure 12 The marine propeller 100 of the eighth embodiment is largely the same as that of the seventh embodiment, except that the duct 3 of the eighth embodiment can move relative to the frame 1 along a first direction A and a second direction B. The first direction A is parallel to the axial direction of the propeller 2, and the second direction B is perpendicular to the axial direction of the propeller 2 and parallel to the extension direction of the frame 1. When the duct 3 is in the flow guiding state, the duct 3 moves along the first direction A and the second direction B to a position surrounding the propeller 2 to guide the flow of the propeller 2. Specifically, the duct 3 first moves along the second direction B to a position coaxial with the propeller 2, and then the duct 3 moves along the first direction A, so that the propeller 2 is fitted inside the duct 3, and the duct 3 is arranged around the propeller 2, with the duct 3 and the propeller 2 together forming a duct-type propeller structure. When the duct 3 is in the open state, the duct 3 moves along the first direction A and the second direction B to a position offset from the propeller 2, and part of the duct 3 is on the water surface, while the other part forms the wave-pressure structure. Specifically, the duct 3 first moves along the first direction A, causing the propeller 2 to leave the area enclosed by the duct 3. Then, the duct 3 moves along the second direction B to a position offset from the propeller 2, and a portion of the structure of the duct 3 forms a wave-pressure structure on the water surface. In this embodiment, when the duct 3 moves along the second direction B to the water surface, the bottom structure of the duct 3 forms the wave-pressure structure, which is used to block the waves on the water surface and reduce the resistance of the ship.

[0086] Furthermore, the marine propulsion unit 100 includes an adapter 4, which is slidably connected to the frame 1 and can slide relative to the frame 1 along a first direction A and a second direction B. The conduit 3 is fixedly connected to the end of the adapter 4 away from the frame 1, so that when the adapter 4 moves, the conduit 3 moves synchronously with the adapter 4, thereby realizing the switching between the guiding mode and the open mode.

[0087] Furthermore, the marine propulsion 100 also includes a first drive assembly 5, which connects the frame 1 and the adapter 4, and is used to drive the adapter 4 to slide relative to the frame 1 along a first direction A and a second direction B.

[0088] Please continue reading. Figure 13 In one embodiment of this application, the first driving assembly 5 includes a first power unit 51, a second power unit 52, and a first support 53. The first power unit 51 connects the frame 1 and the first support 53, and is used to drive the first support 53 to slide relative to the frame 1 along a first direction A. The second power unit 52 connects the first support 53 and the adapter 4, and is used to drive the adapter 4 to slide relative to the first support 53 along a second direction B. The first power unit 51 drives the first support 53 to move the second power unit 52 and the conduit 3 along the first direction A, and the second power unit 52 drives the conduit 3 to move along the second direction B through the adapter 4, thereby realizing the switching of the conduit 3 between a flow-guiding mode and an open mode.

[0089] Please continue reading. Figure 14 In one embodiment of this application, the first power unit 51 includes a first motor 511, a first lead screw 512, and a first nut 513. The first motor 511 is fixed to the frame 1. The first lead screw 512 is arranged along the first direction A in its length direction and is connected to the first motor 511 to obtain the rotational torque of the first motor 511. The first nut 513 is threadedly engaged with the first lead screw 512, and a first bracket 53 is fixedly connected to the first nut 513. When the first motor 511 drives the first lead screw 512 to rotate, the first nut 513 moves along the first lead screw 512, thereby causing the first bracket 53 to drive the second power unit 52 and the conduit 3 to move along the first direction A.

[0090] Please see Figure 15In another embodiment of this application, the first power unit 51 includes a first motor 511, a first gear 514, and a first rack 515. The first motor 511 is fixed to the frame 1, and the first gear 514 is connected to the first motor 511 to obtain the rotational torque of the first motor 511. The first rack 515 is arranged along a first direction A along its length and meshes with the first gear 514. The first bracket 53 is fixedly connected to the first rack 515. When the first motor 511 drives the first gear 514 to rotate, the first rack 515 can move along the first direction A as the first gear 514 rotates, thereby driving the second power unit 52 and the conduit 3 to move along the first direction A through the first bracket 53.

[0091] Please see Figure 16 In one embodiment of this application, the second power unit 52 includes a second motor 521, a second lead screw 522, and a second nut 523. The second motor 521 is fixed to the first bracket 53. The length of the second lead screw 522 is set along the second direction B and is connected to the second motor 521 to obtain the rotational torque of the second motor 521. The second nut 523 is threadedly engaged with the second lead screw 522, and the adapter 4 is fixedly connected to the second nut 523. When the second motor 521 drives the second lead screw 522 to rotate, the second nut 523 moves along the second lead screw 522 accordingly. The adapter 4 moves synchronously with the second nut 523, thereby driving the conduit 3 to move along the second direction B.

[0092] Please see Figure 17 In another embodiment of this application, the second power unit 52 includes a second motor 521, a second gear 524, and a second rack 525. The second motor 521 is fixed to the first bracket 53, and the second gear 524 is connected to the second motor 521 to obtain the rotational torque of the second motor 521. The second rack 525 is arranged along the second direction B in its length direction, and the second rack 525 meshes with the second gear 524. The adapter 4 is fixedly connected to the first rack 515. When the second motor 521 drives the second gear 524 to rotate, the second rack 525 moves along the second direction B as the second gear 524 rotates, and the adapter 4 moves synchronously with the second rack 525, thereby driving the conduit 3 to move along the second direction B.

[0093] Ninth Embodiment

[0094] Please see Figure 18The marine propeller 100 of the ninth embodiment is largely the same as that of the eighth embodiment, except that the duct 3 in the ninth embodiment can move and rotate relative to the frame 1 along a first direction A, and the first direction is parallel to the axial direction of the propeller 2. When the duct 3 is in the flow guiding mode, the duct 3 moves along the first direction A and rotates around the first direction A to a position surrounding the propeller 2, thereby increasing the thrust of the propeller 2. In the process of forming the flow guiding mode, the duct 3 can first rotate around the first direction A to a position coaxial with the propeller 2, and then move along the first direction A toward the propeller 2 to a position surrounding the propeller 2. It is understood that the duct 3 can also move first and then rotate according to the actual situation, as long as the duct 3 does not collide with the propeller 2 during the rotation process, and this application does not limit this.

[0095] When the duct 3 is in the open state, it moves along the first direction A and rotates around the first direction A to a position offset from the propeller 2, with part of the duct 3 on the water surface and the other part forming the wave-pressure structure. During the process of forming the open state, the duct 3 can first move away from the propeller 2 along the first direction A, and then rotate around the first direction A toward the water surface, so that the duct 3 moves to the water surface, and part of the duct 3 forms the wave-pressure structure.

[0096] Furthermore, the marine propulsion unit 100 includes an adapter 4, which is slidably connected to the frame 1 and can slide relative to the frame 1 along a first direction A and rotate about the first direction A. A conduit 3 is fixedly connected to one end of the adapter 4 away from the frame 1, so that the adapter 4 can drive the conduit 3 to move along the first direction A and rotate about the first direction A.

[0097] Furthermore, the marine propulsion 100 also includes a second drive assembly 6, which connects the frame 1 and the adapter 4, and is used to drive the adapter 4 to slide relative to the frame 1 along a first direction A and rotate about the first direction A.

[0098] Please continue reading. Figure 19 The second drive assembly 6 includes a third power unit 61, a fourth power unit 62, and a second support 63. The third power unit 61 connects the frame 1 and the second support 63, and drives the second support 63 to slide relative to the frame 1 along a first direction A. The fourth power unit 62 connects the second support 63 and the adapter 4, and drives the adapter 4 to rotate around the first direction A.

[0099] Please continue reading. Figure 20The third power unit 61 includes a third motor 611, a third lead screw 612, and a third nut 613. The third motor 611 is fixed to the frame 1. The third lead screw 612 is positioned along the first direction A along its length and is connected to the third motor 611 to obtain the rotational torque of the third motor 611. The third nut 613 is threadedly engaged with the third lead screw 612, and a second bracket 63 is fixedly connected to the third nut 613. When the third motor 611 drives the third lead screw 612 to rotate, the third nut 613 moves along the third lead screw 612, and the second bracket 63 moves synchronously with the third nut 613, thereby driving the fourth power unit 62 and the conduit 3 to move along the first direction A. The fourth power unit 62 can be a rotary motor capable of driving the conduit 3 to rotate around the first direction A via an adapter 4.

[0100] Please see Figure 21 In one embodiment of this application, the third power unit 61 includes a third motor 611, a third gear 614, and a third rack 615. The third motor 611 is fixed to the frame 1, and the third gear 614 is connected to the third motor 611 to obtain the rotational torque of the third motor 611. The third rack 615 is arranged along the first direction A in its length direction, and the third rack 615 meshes with the third gear 614. The second bracket 63 is fixedly connected to the third rack 615. When the third motor 611 drives the third gear 614 to rotate, the third rack 615 moves with the rotation of the third gear 614, and the second bracket 63 moves synchronously with the third rack 615 to drive the fourth power unit 62 and the conduit 3 to move along the first direction A.

[0101] Tenth Embodiment

[0102] Please see Figure 22 The marine propeller 100 of the tenth embodiment is largely the same as that of the ninth embodiment, except that the duct 3 in the tenth embodiment can rotate relative to the frame 1 about a third direction, which is perpendicular to the axial direction of the propeller 2 and the extension direction of the frame 1, i.e., the first direction, the second direction, and the third direction are mutually perpendicular. When the duct 3 is in the flow guiding state, the duct 3 rotates about the third direction to a position surrounding the propeller 2 to increase the thrust of the propeller 2. When the duct 3 is in the open state, the duct 3 rotates about the third direction to a position offset from the propeller 2, and part of the duct 3 is on the water surface, while the other part forms the wave-pressure structure.

[0103] Furthermore, the marine propulsion unit 100 includes a tilting bracket 7 fixedly connected to the frame 1, the tilting bracket 7 being spaced apart from the propeller 2. A tilting shaft 71 is also provided at the end of the tilting bracket 7 away from the frame 1, the axial direction of the tilting shaft 71 forming the third direction, and the guide tube 3 is rotatably connected to the tilting shaft 71.

[0104] Furthermore, the marine propulsion 100 includes a rotation drive 8, which is fixedly mounted on the tilting bracket 7 and connected to the tilting shaft 71. The rotation drive 8 is used to drive the tilting shaft 71 to rotate, thereby causing the duct 3 to rotate around a third direction to switch between the flow guiding state and the open state.

[0105] Please see Figure 23 In one embodiment of this application, the marine propulsion unit 100 further includes a detection device 91 and a control device 92. The detection device 91 is disposed on the drive shaft 12, and the control device 92 is used to control the deformation of the duct 3, and the detection device 91 is communicatively connected to the control device 92. Specifically, the detection device 91 is used to detect the rotational speed of the drive shaft 12, and the control device 92 drives the duct 3 to present a flow-guiding shape or an open shape according to the detection result of the detection device 91.

[0106] Please see Figure 24 The embodiments of this application also provide a ship 200, which includes a hull 201 and a marine propulsion 100 as described in any of the above embodiments, wherein the marine propulsion 100 is disposed at the stern end of the hull 201.

[0107] Please see Figure 25 The vessel 200 also includes a motor 202, which is connected to the drive shaft 12 of the marine propeller 100 and is used to drive the propeller 2 to rotate. Furthermore, the vessel 200 also includes a controller 203 and a driver 204, the controller 203 being communicatively connected to the driver 204, and the driver 204 causing the duct 3 to deform according to instructions from the controller 203.

[0108] Please see Figure 26 The embodiments of this application also provide a control method for a marine propulsion system, applied to the marine propulsion system 100 described in any of the above embodiments, comprising:

[0109] Detect the rotational speed of the propeller.

[0110] Once the propeller's rotation speed is confirmed to meet the first preset threshold, the control duct is placed in a flow guiding mode.

[0111] Once the propeller's rotation speed is confirmed to meet the second preset threshold, the control duct is kept in an open state.

[0112] Furthermore, when the flow guiding structure 32 and the fixed structure 31 of the conduit 3 are rotatably connected, the step of controlling the conduit to be in the flow guiding mode includes: controlling the flow guiding structure 32 of the conduit 3 to rotate relative to the fixed structure 31 of the conduit 3 toward the propeller 2, and the flow guiding structure 32 and the fixed structure 31 surround the periphery of the propeller 2.

[0113] The step of controlling the conduit to be in the open state includes: controlling the flow guiding structure 32 to move to the side of the fixed structure 31 away from the propeller 2.

[0114] When the flow guiding structure 32 and the fixed structure 31 of the conduit 3 are in a telescopic connection relationship, the step of controlling the conduit to be in the flow guiding mode includes: the flow guiding structure 32 of the control conduit 3 extends relative to the fixed structure 31 of the conduit 3, and the flow guiding structure 32 and the fixed structure 31 surround the periphery of the propeller 2.

[0115] The step of controlling the conduit to be in an open state includes: controlling the flow guiding structure 32 to contract relative to the fixed structure 31.

[0116] When the duct 3 can move relative to the frame 1 along the first direction A and the second direction B to switch between the flow guiding state and the open state, the step of controlling the duct to be in the flow guiding state includes: controlling the duct 3 to move along the second direction so that the duct 3 is coaxially arranged with the propeller 2; controlling the duct 3 to move along the first direction to a position surrounding the propeller 2.

[0117] The steps of controlling the conduit to be in an open state include: the control conduit 3 moving away from the propeller 2 in a first direction to separate the conduit 3 from the propeller 2; the control conduit 3 moving in a second direction, with part of the conduit 3 moving to the water surface and the other part of the conduit 3 forming a wave-pressure structure.

[0118] When the duct 3 can move relative to the frame 1 along the first direction A and rotate around the first direction A to switch between the flow guiding state and the open state, the step of controlling the duct 3 to be in the flow guiding state includes: controlling the duct 3 to rotate around the first direction and move along the first direction to a position surrounding the propeller 2.

[0119] The step of controlling the conduit to be in an open state includes: the control conduit 3 moves along a first direction and rotates around the first direction to a position offset from the propeller 2, with part of the conduit 3 located on the water surface and the other part forming a wave-pressure structure.

[0120] When the duct 3 can rotate relative to the frame 1 about a third direction to switch between the flow guiding state and the open state, the step of controlling the duct to be in the flow guiding state includes: controlling the duct 3 to rotate about a third direction to a position surrounding the propeller 2.

[0121] The step of placing the control duct in the open state includes: rotating the control duct 3 around a third direction to a position offset from the propeller 2, with part of the duct 3 located on the water surface and the other part forming a wave-pressure structure.

[0122] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of this application should not depart from the spirit and scope of the technical solutions of this application.

Claims

1. A marine propulsion device, characterized in that, include: The frame is equipped with an underwater suspension part, and the underwater suspension part is equipped with a drive shaft; The propeller is connected to the drive shaft; A conduit connected to the frame, at least a portion of which is movable relative to the propeller to present a flow-guiding or open configuration; When the conduit is in the flow guiding mode, the conduit surrounds the propeller and is coaxially arranged with the propeller. When the conduit is in the open state, the conduit is located on the water surface and at least partially forms a wave-pressure structure; It also includes a detection device and a control device. The detection device is mounted on the drive shaft, and the control device is used to control the deformation of the conduit. The detection device is communicatively connected to the control device. The detection device is used to detect the rotation speed of the drive shaft, and the control device drives the conduit to present a flow guiding shape or an open shape according to the detection result of the detection device.

2. The marine propulsion device according to claim 1, characterized in that: The duct includes a flow guiding structure and a fixing structure. The fixing structure is fixedly connected to the frame, and the flow guiding structure is rotatably connected to the fixing structure. When the duct is in the flow guiding mode, the flow guiding structure is spliced ​​with the fixing structure and arranged around the propeller. When the duct is in the open mode, the flow guiding structure is folded to the side of the fixing structure away from the propeller, and the fixing structure forms the wave-pressure structure.

3. The marine propulsion device according to claim 2, characterized in that: The flow guiding structure includes a first structural component and a second structural component, which are rotatably connected to the two ends of the fixed structure. When the duct is in the flow guiding mode, the first structural component and the second structural component rotate toward the propeller, and the first structural component, the second structural component, and the fixed structure surround the propeller. With the conduit in an open state, the first and second structural members are folded over to the side of the fixed structure opposite to the propeller.

4. The marine propulsion device according to claim 3, characterized in that: The flow guiding structure further includes a third structural component and a fourth structural component, wherein the third structural component is rotatably connected to the first structural component, and the fourth structural component is rotatably connected to the second structural component; When the conduit is in the flow guiding mode, the fixing structure, the first structural member, the third structural member, the fourth structural member, and the second structural member can be spliced ​​into a ring structure and surround the propeller. When the conduit is in the open state, the third structural member and the fourth structural member rotate to the side of the first structural member and the second structural member that is away from the propeller, and the first structural member and the second structural member respectively carry the third structural member and the fourth structural member to the side of the fixed structure that is away from the propeller.

5. The marine propulsion device according to claim 1, characterized in that: The conduit includes a flow guiding structure and a fixing structure. The fixing structure is connected to the frame, and the flow guiding structure is telescopically connected to the fixing structure. When the conduit is in the flow guiding mode, the flow guiding structure extends relative to the fixing structure. When the conduit is in the open mode, the flow guiding structure contracts relative to the fixing structure, and the fixing structure forms the wave pressure structure.

6. The marine propulsion device according to claim 5, characterized in that: The flow guiding structure includes a first structural member and a second structural member, which are telescopically connected to the fixed structure. When the conduit is in the flow guiding mode, the first structural member and the second structural member extend relative to the fixed structure and surround the propeller. When the conduit is in the open mode, the first structural member and the second structural member retract relative to the fixed structure, and move into the inner cavity of the fixed structure or to the side of the fixed structure away from the propeller.

7. The marine propulsion device according to claim 6, characterized in that: The flow guiding structure further includes a third structural component and a fourth structural component, wherein the third structural component is retractably connected to the first structural component, and the fourth structural component is retractably connected to the second structural component; When the conduit is in the flow guiding mode, the third structural member extends relative to the first structural member, the fourth structural member extends relative to the second structural member, and the fourth structural member is connected to the third structural member; When the conduit is in the open state, the third structural member and the fourth structural member contract relative to the first structural member and the second structural member, respectively.

8. The marine propulsion device according to claim 1, characterized in that: The conduit includes a flow guiding structure, a fixed structure, and a movable structure. The fixed structure is fixedly connected to the frame, and the movable structure is rotatably connected between the flow guiding structure and the fixed structure. When the conduit is in the flow guiding mode, the movable structure drives the flow guiding structure to rotate toward the propeller, and the fixed structure and the flow guiding structure can be spliced ​​together to form a ring structure; When the conduit is in the open state, the movable structure drives the flow guiding structure to flip along the axial direction of the conduit and toward the extension direction of the frame to the side of the fixed structure away from the propeller.

9. The marine propulsion device according to claim 1, characterized in that: The duct can move relative to the frame along a first direction and a second direction. The first direction is parallel to the axial direction of the propeller, and the second direction is perpendicular to the axial direction of the propeller and parallel to the extension direction of the frame. When the duct is in a flow guiding state, it moves along the first direction and the second direction to a position surrounding the propeller. When the duct is in an open state, it moves along the first direction and the second direction to a position offset from the propeller, with part of the duct located on the water surface and the other part forming the wave-pressure structure.

10. The marine propulsion device according to claim 9, characterized in that: The marine propulsion unit includes an adapter that is slidably connected to the frame and can slide relative to the frame in the first direction and the second direction. The conduit is fixedly connected to one end of the adapter that is away from the frame.

11. The marine propulsion device according to claim 10, characterized in that: The marine propulsion system further includes a first drive assembly, which connects the frame and the adapter, and is used to drive the adapter to slide relative to the frame along the first direction and the second direction.

12. The marine propulsion device according to claim 11, characterized in that: The first drive assembly includes a first power unit, a second power unit, and a first bracket. The first power unit connects the frame and the first bracket and is used to drive the first bracket to slide relative to the frame along the first direction. The second power unit connects the first bracket and the adapter and is used to drive the adapter to slide relative to the first bracket along the second direction.

13. The marine propulsion device according to claim 12, characterized in that: The first power unit includes a first motor, a first lead screw, and a first nut. The first motor is fixed to the frame. The length direction of the first lead screw is arranged along the first direction and connected to the first motor to obtain the rotational torque of the first motor. The first nut is threadedly engaged with the first lead screw, and the first bracket is fixedly connected to the first nut.

14. The marine propulsion device according to claim 12, characterized in that: The first power unit includes a first motor, a first gear, and a first rack. The first motor is fixed to the frame, the first gear is connected to the first motor to obtain the rotational torque of the first motor, and the first rack is arranged along the first direction in the length direction and meshes with the first gear. The first bracket is fixedly connected to the first rack.

15. The marine propulsion device according to claim 12, characterized in that: The second power unit includes a second motor, a second lead screw, and a second nut. The second motor is fixed to the first bracket. The length of the second lead screw is set along the second direction and connected to the second motor. The second nut is threadedly engaged with the second lead screw. The adapter is fixedly connected to the second nut.

16. The marine propulsion device according to claim 12, characterized in that: The second power unit includes a second motor, a second gear, and a second rack. The second motor is fixed to the first bracket, and the second gear is connected to the second motor to obtain the rotational torque of the second motor. The length direction of the second rack is set along the second direction and meshes with the second gear. The adapter is fixedly connected to the second rack.

17. The marine propulsion device according to claim 1, characterized in that: The duct is movable relative to the frame along a first direction and rotated about a first direction, the first direction being parallel to the propeller axis; When the conduit is in the flow guiding mode, the conduit moves along the first direction and rotates around the first direction to a position surrounding the propeller; When the conduit is in the open state, the conduit moves along the first direction and rotates around the first direction to a position offset from the propeller. Part of the conduit is located on the water surface, and the other part forms the wave-pressure structure.

18. The marine propulsion device according to claim 17, characterized in that: The marine propulsion unit includes an adapter that is slidably connected to the frame and can slide relative to the frame along the first direction and rotate about the first direction. The conduit is fixedly connected to the end of the adapter away from the frame.

19. The marine propulsion system according to claim 18, characterized in that: The marine propulsion system further includes a second drive assembly connected to the frame and the adapter, for driving the adapter to slide relative to the frame along the first direction and rotate about the first direction.

20. The marine propulsion device according to claim 19, characterized in that: The second drive assembly includes a third power group, a fourth power group, and a second bracket. The third power group connects the frame and the second bracket and is used to drive the second bracket to slide relative to the frame along the first direction. The fourth power group connects the second bracket and the adapter and is used to drive the adapter to rotate around the first direction.

21. The marine propulsion device according to claim 20, characterized in that: The third power unit includes a third motor, a third lead screw, and a third nut. The third motor is fixed to the frame. The length direction of the third lead screw is set along the first direction and connected to the third motor to obtain the rotational torque of the third motor. The third nut is threadedly engaged with the third lead screw. The second bracket is fixedly connected to the third nut.

22. The marine propulsion device according to claim 20, characterized in that: The third power unit includes a third motor, a third gear, and a third rack. The third motor is fixed to the frame, and the third gear is connected to the third motor to obtain the rotational torque of the third motor. The third rack is arranged along the first direction in the length direction and meshes with the third gear. The second bracket is fixedly connected to the third rack.

23. The marine propulsion device according to claim 1, characterized in that: When the propeller's rotational speed is at a first preset threshold, the duct is in a flow guiding state.

24. The marine propulsion device according to claim 23, characterized in that: When the propeller's rotational speed is at a second preset threshold, the duct is in an open state.

25. The marine propulsion device according to claim 1, characterized in that: The duct can rotate relative to the frame about a third direction, which is perpendicular to the axis of the propeller and the extension direction of the frame. When the duct is in the flow guiding state, the duct rotates about the third direction to a position surrounding the propeller. When the duct is in the open state, the duct rotates about the third direction to a position offset from the propeller, and part of the duct is located on the water surface, while the other part forms the wave-pressure structure.

26. The marine propulsion device according to claim 25, characterized in that: The marine propulsion unit includes a tilting bracket fixedly connected to the frame. The tilting bracket is spaced apart from the propeller. A tilting shaft is provided at one end of the tilting bracket away from the frame. The axial direction of the tilting shaft forms the third direction. The guide tube is rotatably connected to the tilting shaft.

27. The marine propulsion device according to claim 26, characterized in that: The marine propulsion unit includes a rotation drive component, which is fixedly mounted on the tilting bracket and connected to the tilting shaft for driving the tilting shaft to rotate.

28. The marine propulsion device according to claim 3 or 6, characterized in that: The first structural component, the second structural component, and the fixing structure are arc-shaped tubular structures, and the arc lengths of the first structural component and the second structural component are respectively greater than or equal to the arc length of the fixing structure.

29. A ship, characterized in that, It includes a hull and a marine propulsion system as described in any one of claims 1-28, wherein the marine propulsion system is disposed at the stern end of the hull.

30. The ship according to claim 29, characterized in that: The vessel also includes an electric motor connected to the drive shaft of the marine propeller, which drives the propeller to rotate.

31. The ship according to claim 30, characterized in that: The vessel also includes a controller and a drive, the controller being communicatively connected to the drive, the drive causing the duct to deform according to instructions from the controller.

32. A control method for a marine propulsion system, characterized in that, The control method is applied to the marine propulsion system according to any one of claims 1-28, comprising: Detect the rotational speed of the propeller; Once the propeller's rotation speed is confirmed to meet the first preset threshold, the duct is controlled to be in a flow guiding mode. Once the propeller's rotation speed is confirmed to meet the second preset threshold, the control duct is kept in an open state.

33. The control method for a marine propulsion system according to claim 32, characterized in that, The control conduit being in a flow-guiding configuration includes: The flow guiding structure of the control duct rotates relative to the fixed structure of the duct toward the propeller, and the flow guiding structure and the fixed structure surround the circumference of the propeller.

34. The control method for a marine propulsion system according to claim 33, characterized in that, The control catheter being in an open state includes: The flow guide structure is moved to the side of the fixed structure that is away from the propeller.

35. The control method for a marine propulsion system according to claim 32, characterized in that, The control conduit being in a flow-guiding configuration includes: The flow guiding structure of the control duct extends relative to the fixed structure of the duct, and the flow guiding structure and the fixed structure surround the circumference of the propeller.

36. The control method for a marine propulsion system according to claim 35, characterized in that, The control catheter being in an open state includes: The flow guiding structure contracts relative to the fixed structure.

37. The control method for a marine propulsion system according to claim 32, characterized in that, The control conduit being in a flow-guiding configuration includes: Control the duct to move in the second direction so that the duct is coaxial with the propeller; The control duct moves along the first direction to a position surrounding the propeller.

38. The control method for a marine propulsion system according to claim 37, characterized in that, The control catheter being in an open state includes: Control the duct to move away from the propeller in the first direction, so that the duct separates from the propeller; The control pipe moves along the second direction, with part of the pipe moving to the water surface and the other part forming a wave-pressure structure.

39. The control method for a marine propulsion system according to claim 32, characterized in that, The control conduit being in a flow-guiding configuration includes: The control duct rotates around a first direction and moves along the first direction to a position surrounding the propeller.

40. The control method for a marine propulsion system according to claim 39, characterized in that, The control catheter being in an open state includes: The control duct moves along a first direction and rotates around the first direction to a position offset from the propeller. Part of the duct is on the water surface, and the other part forms a wave-pressure structure.

41. The control method for a marine propulsion system according to claim 32, characterized in that, The control conduit being in the flow guiding configuration includes: Control the duct to rotate around a third direction until it is positioned around the propeller.

42. The control method for a marine propulsion system according to claim 41, characterized in that, The control catheter being in an open state includes: The control duct rotates around a third direction to a position offset from the propeller, with part of the duct above the water surface and the other part forming a wave-pressure structure.

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