Electrically driven straight wing propulsion device

Abstract

This invention discloses an electrically driven straight-wing propulsion device. A central shaft assembly is fixedly connected to a slewing box cover plate in a slewing drive device via a central shaft connector. The slewing box cover plate is fixedly connected to the slewing box body. The rotor coil of the slewing motor is installed inside the outer lower box, and the stator coil of the slewing motor is installed inside the slewing box body. Multiple sets of blade self-rotating motors and blade shaft assemblies are installed between the slewing box cover plate and the slewing box body. The blade self-rotating motors are connected to the blade shafts in the blade shaft assemblies. Through the stator and rotor coils of the slewing motors, the slewing box body rotates relative to the outer lower box body, achieving revolution. The blade self-rotating motors drive the blade shafts to rotate, achieving blade rotation. This invention uses electric motors to replace the traditional mechanical transmission structure, simplifying system complexity and improving device reliability. By precisely controlling the blade's rotation attitude during revolution, cavitation under high-speed operation is optimized, significantly reducing operating noise.

Description

Technical Field

[0001] This invention belongs to the field of ship propulsion system design technology, specifically an electric-driven straight-wing propulsion device. Background Technology

[0002] The straight-wing propeller propulsion system is an innovative system that integrates servo motors and propulsion, featuring a compact structure and flexible operation. Through the rotation of the blades and the overall rotation of the propeller, it effectively overcomes the shortcomings of traditional propellers, such as slow steering response and large shaft space requirements. The thrust direction can be changed rapidly; by utilizing the synergistic effect of the blade rotation and revolution, a consistent thrust is generated, achieving rudderless steering. Its unique propulsion method results in significantly higher propulsion efficiency than traditional propellers. The integrated hoisting design simplifies the installation process, eliminating the need for traditional shaft tubes and tail shafts, thus improving the system's flexibility and ease of maintenance.

[0003] A straight-wing propeller propulsion system mainly consists of blades, a slewing drive, a rudder drive, a power transmission system, and a sealing device. The blades themselves can rotate under the action of bearings and a transmission mechanism. Mounted on the slewing drive, the blades can rotate 360° around the center of the drive. Through the power transmission system, the blades revolve around the slewing drive while simultaneously rotating around their own axis. The combined effect of rotation and revolution generates thrust in a fixed direction. The rudder drive changes the direction of this thrust, enabling the ship to move forward, turn, and reverse. However, existing straight-wing propeller propulsion systems generally have the following problems:

[0004] 1. The mechanical structure is complex. Its steering drive device and power transmission device mostly use mechanical transmission such as linkage mechanism or gear transmission. The revolution and rotation of the propeller blades require strict control of the structure. Its core components need to be manufactured with high precision, which increases the manufacturing cost and maintenance difficulty.

[0005] 2. Mechanical transmission drives suffer from energy losses such as gear friction and connecting rod shaft wear, resulting in low transmission efficiency. Gear meshing and long shaft rotation are prone to generating mechanical vibration and low-frequency noise. Transmission gaps can easily cause impact vibration, resulting in large vibration amplitude of the whole machine and poor comfort of ship navigation.

[0006] 3. Mechanical transmission control has low adjustment accuracy and slow response; the consistency of multiple blades relies on mechanical structure and is difficult to fine-tune independently; the range of thrust magnitude and direction adjustment is narrow, the dynamic response is slow, fine control cannot be achieved, and the ability to resist load disturbance is weak.

[0007] 4. The propeller blades have limited adjustment in rotation and revolution, and the angle of contact between the blades and the water is relatively fixed. This makes it impossible to avoid cavitation effects during high-speed navigation, resulting in decreased propulsion efficiency and reduced blade durability.

[0008] Among existing related patent technologies, such as the ring magnetic drive shaftless intelligent rotor propeller disclosed in patent document (CN118928722A), although the mechanical structure is simplified and the noise is reduced by electrification, its blade hydrodynamic shape is fixed and lacks a real-time adaptive adjustment mechanism, which limits the adjustment of the angle of attack of the blade in contact with the water. During high-speed navigation, cavitation effect is easily induced on the blade surface, which not only causes the flow field to deteriorate and the propulsion efficiency to drop sharply, but also causes severe cavitation damage and mechanical fatigue due to the micro-jet generated by cavitation collapse and the high-frequency alternating hydrodynamic impact load, which greatly reduces the durability and reliability of the blade, bearing and drive motor.

[0009] Therefore, there is an urgent need for a new type of electric-driven straight-wing propulsion device that can optimize cavitation at high speeds and significantly reduce operating noise by precisely controlling the rotational attitude of the blades during revolution. Summary of the Invention

[0010] This invention aims to propose an electrically driven straight-wing propulsion device that replaces the traditional mechanical transmission structure with an electric motor, simplifying system complexity and improving device reliability. By precisely controlling the blade's rotational attitude during revolution, cavitation under high-speed operation is optimized, significantly reducing operating noise.

[0011] This invention employs a combination of a rotary motor and a self-rotating motor, with the self-rotating motor directly connected to the propeller shaft, simplifying the mechanical transmission structure. By utilizing the rotary and self-rotating motors, the propeller blades achieve both rotation and revolution, precisely adjusting the thrust angle at different revolution positions, improving blade attitude at high speeds, and effectively solving thrust adjustment issues at different speeds and cavitation problems at high speeds. Addressing the problems of complex structure, low control precision, and high-speed cavitation in traditional mechanically driven straight-wing propellers, this invention achieves a comprehensive technological upgrade through mechatronics integration, independent servo drive, and intelligent collaborative control. Specific improvements are as follows: (1) The structure is highly integrated, simplifying the transmission system and reducing manufacturing and maintenance costs. An electric-driven straight-wing propulsion device eliminates the complex linkage mechanisms, long transmission shafts, and multi-stage gear transmission structures of traditional devices, and removes the mechanical forced synchronization mechanism. It adopts an integrated solution with direct motor coupling drive, significantly simplifying the overall transmission chain. The drive unit uses a modular, short-path coaxial arrangement, effectively saving internal space and improving the overall structural compactness and space utilization. The number of mechanical transmission kinematic pairs is greatly reduced, fundamentally reducing energy loss caused by gear friction and linkage rotation, and significantly improving system transmission efficiency. This also lowers the machining precision requirements, manufacturing costs, and subsequent maintenance difficulty of core components.

[0012] (2) Achieve flexible and adjustable blade angle to improve propulsion efficiency and structural durability. Compared to the limitations of traditional mechanical straight-wing propellers, which have fixed blade angles, simple motion trajectories, and are unable to adapt to high-speed, variable operating conditions, an electrically driven straight-wing propulsion device features independently adjustable blade revolution and rotation. Utilizing high-precision servo drive and programmable cycloidal trajectory planning technology, it can dynamically adjust the blade angle of attack and oscillation pattern in real time according to sailing speed, water flow load, and maneuvering status. This avoids excessively large instantaneous angles of attack and large low-pressure areas during high-speed navigation, effectively suppressing the initiation, development, and collapse of cavitation bubbles, and significantly improving cavitation characteristics under high-speed conditions. It also reduces the impact damage of cavitation erosion on the blade structure, extending blade life and improving the overall high-speed propulsion performance.

[0013] (3) Optimize noise issues and achieve quiet propulsion. By eliminating gear meshing impact and long shaft periodic vibration excitation sources, the overall machine vibration and low-frequency noise are effectively suppressed; real-time dynamic adjustment of blade angle of attack and oscillation pattern reduces cavitation effect, thereby reducing impact noise and shell vibration caused by cavitation collapse, significantly improving acoustic performance and enhancing operational stability.

[0014] To achieve the above objectives, the technical solution adopted by the present invention is as follows: An electrically driven straight-wing propulsion device includes a central shaft assembly, a slewing drive device, and a blade shaft assembly. The slewing drive device includes an outer upper housing, an outer middle housing, an outer lower housing, a slewing motor stator coil, a slewing motor rotor coil, a blade shaft bearing end cover, a slewing box cover plate, a blade self-rotating motor, a blade shaft lower bearing seat, a slewing box housing, and a self-rotating motor seat. The central shaft assembly is fixedly connected to the slewing box cover plate in the slewing drive device via a central shaft connector. The slewing box cover plate is fixedly connected to the slewing box housing. The outer middle housing is fixedly connected to the hull. The outer upper housing is fixedly connected above the outer middle housing, and the outer lower housing is fixedly connected to the hull. Below the outer middle housing, the rotor coil of the rotary motor is installed inside the outer lower housing, and the stator coil of the rotary motor is installed inside the rotary housing. Multiple sets of blade self-rotating motors and blade shaft assemblies are installed between the rotary housing cover and the rotary housing. The blade self-rotating motor is connected to the blade shaft in the blade shaft assembly. Through the stator coil and rotor coil of the rotary motor, the rotary housing rotates relative to the outer lower housing, realizing the revolution of the electric-driven straight-wing propulsion device. The blade self-rotating motor drives the blade shaft to rotate, realizing the blade self-rotation of the electric-driven straight-wing propulsion device.

[0015] Furthermore, the blade rotation provides thrust, and the blade revolution changes the direction of thrust. By controlling the blade's rotation attitude during the revolution, propulsion effects under different working conditions can be achieved.

[0016] Furthermore, the central shaft assembly includes a central shaft, a slip ring device, a central shaft bearing, a central shaft bearing housing, a central shaft seal, and a central shaft connector. The connection point of the central shaft is fixedly connected to the central shaft connector by a bolt group. The central shaft bearing is installed in the central shaft bearing housing. The central shaft bearing housing and the central shaft seal are fixed by a bolt group to achieve the positioning of the central shaft bearing. The slip ring device and the central shaft bearing are assembled on the central shaft to form the central shaft assembly.

[0017] Furthermore, the blade shaft assembly includes an upper bearing, a blade shaft, a lower bearing, a blade shaft connecting flange, and blades. The blade shaft and blades are connected by the blade shaft connecting flange. The upper bearing and the lower bearing are assembled at the upper end and middle of the blade shaft, respectively, to form the blade shaft assembly.

[0018] Furthermore, the blade shaft assembly is connected to the rotary box cover plate in the rotary drive device via an upper bearing, and to the lower bearing seat of the blade shaft in the rotary drive device via a lower bearing.

[0019] Furthermore, the blade shaft bearing end cover is fixedly connected to the rotary box cover plate, the blade self-rotating motor and the self-rotating motor seat are fixed by bolt group, and the blade shaft lower bearing seat and the self-rotating motor seat are fixed in the rotary box body by bolt group.

[0020] Furthermore, the rotary box cover plate is fixedly connected to the rotary box body by a bolt group.

[0021] There are four blade shaft bearing end caps, which are evenly distributed and fixed on the rotary box cover plate.

[0022] Furthermore, the four sets of blade self-rotating motors and self-rotating motor mounts are fixed together by bolt groups, and the blade shaft lower bearing seat and self-rotating motor mount are fixed together in the rotary box housing by bolt groups.

[0023] Furthermore, the blade cross-section of the blade adopts a symmetrical structure, which can improve the hydrodynamic performance of the blade.

[0024] Compared with the prior art, the present invention has the following significant advantages: 1. The mechanical transmission in traditional straight-wing propellers is achieved through motor drive, eliminating the need for multi-stage transmission structures, greatly simplifying the complex structure, and improving the integration and quietness of the straight-wing propeller.

[0025] 2. The propeller blades are rotated and revolved by a motor. The rotation attitude of the blades during the revolution is precisely controlled by controlling the motor. The propulsion direction of a single blade is controlled under different propulsion conditions, thus optimizing the hydrodynamic performance during propulsion and improving propulsion efficiency.

[0026] 3. The slewing drive device adopts a split structure consisting of an outer upper housing, an outer middle housing, and an outer lower housing. The slewing housing is rotated by a coil. The internal condition of the device can be observed by disassembling a part of the housing, whether inside or outside the cabin. The overall installation and disassembly are flexible, which facilitates subsequent inspection and maintenance.

[0027] The invention and design of the above-described straight-blade propeller simplifies the complex mechanical transmission mechanism by employing an electric motor drive, achieving precise control over the propeller's rotational attitude during its revolution. The housing adopts a split design, allowing for flexible installation and disassembly. This design not only improves the propeller's maneuverability and maintainability but also regulates cavitation under high-speed propulsion, significantly reducing operating noise. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the straight-wing propeller device of the present invention; Figure 2 This is a cross-sectional view of the straight-wing propeller device of the present invention; Figure 3 This is a three-dimensional cross-sectional view of the straight-wing propeller device of the present invention; Figure 4 This is a schematic diagram of the blade shaft assembly structure of the present invention; Figure 5 This is a schematic diagram of the symmetrical structure of the propeller blade of the present invention; Figure 6 This is a bottom view of the straight-wing propeller device of the present invention; The reference numerals in the attached figures are as follows: 1.0 Central shaft assembly, 2.0 Rotary drive device, 3.0 Blade shaft assembly, 1.1 Central shaft, 1.2 Slip ring device, 1.3 Central shaft bearing, 1.4 Central shaft bearing seat, 1.5 Central shaft seal, 1.6 Central shaft connector, 2.1 Outer upper housing, 2.2 Outer middle housing, 2.3 Outer lower housing, 2.4 Rotary motor stator coil, 2.5 Rotary motor rotor coil, 2.6 Blade shaft bearing end cover, 2.7 Rotary box cover plate, 2.8 Blade self-rotating motor, 2.9 Blade shaft lower bearing seat, 2.10 Rotary box housing, 2.11 Self-rotating motor seat, 3.1 Upper bearing, 3.2 Blade shaft, 3.3 Lower bearing, 3.4 Blade shaft connecting flange, 3.5 Blade. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0030] like Figures 1 to 6 As shown, an embodiment of the present invention provides an electric-driven straight-wing propulsion device, including a central shaft assembly 1.0, a rotary drive device 2.0, and a blade shaft assembly 3.0.

[0031] The central shaft assembly 1.0 includes a central shaft 1.1, a slip ring device 1.2, a central shaft bearing 1.3, a central shaft bearing housing 1.4, a central shaft seal 1.5, and a central shaft connector 1.6. The connection point of the end face of the central shaft 1.1 is fixed to the central shaft connector 1.6 by a bolt group. The outer ring of the central shaft bearing 1.3 is assembled on the central shaft bearing housing 1.4. The central shaft bearing housing 1.4 and the central shaft seal 1.5 are fixed by a bolt group to achieve axial positioning of the central shaft bearing 1.3. The slip ring device 1.2 and the central shaft bearing 1.3 are assembled on the central shaft 1.1.

[0032] The rotary drive unit 2.0 includes an outer upper housing 2.1, an outer middle housing 2.2, an outer lower housing 2.3, a rotary motor stator coil 2.4, a rotary motor rotor coil 2.5, a blade shaft bearing end cover 2.6, a rotary box cover plate 2.7, a blade self-rotating motor 2.8, a blade shaft lower bearing seat 2.9, a rotary box housing 2.10, and a self-rotating motor seat 2.11. The outer middle housing 2.2 is assembled and fixed to the hull. The outer upper housing 2.1 is fixed above the outer middle housing 2.2 by bolts. The outer lower housing 2.3 is fixed below the outer middle housing 2.2 by bolts. The stator coil 2.4 of the rotary motor is assembled at the corresponding assembly position of the outer lower housing 2.3. The stator coil 2.5 of the rotary motor is assembled at the corresponding assembly position of the rotary box housing 2.10. The rotary box cover 2.7 is fixed to the rotary box housing 2.10 by bolts. Four blade shaft bearing end covers 2.6 are fixed at corresponding positions on the rotary box cover 2.7. Four sets of propeller self-rotating motors 2.8 are fixed to the self-rotating motor mounts 2.11 by bolts. The blade shaft lower bearing mount 2.9 and the self-rotating motor mount 2.11 are fixed at corresponding positions on the rotary box housing 2.10 by bolts.

[0033] The blade shaft assembly 3.0 includes an upper bearing 3.1, a blade shaft 3.2, a lower bearing 3.3, a blade shaft connecting flange 3.4, and a blade 3.5. The blade shaft 3.2 is connected to the blade shaft connecting flange 3.4 by bolts, and the blade shaft connecting flange 3.4 is connected to the blade 3.5 by bolts. The inner rings of the upper bearing 3.1 and the lower bearing 3.3 are assembled in corresponding positions on the blade shaft 3.2, together forming the blade shaft assembly 3.0.

[0034] The propeller blades 3.5 have a symmetrical cross-section design (see...). Figure 5 This is beneficial for improving the hydrodynamic performance of the blades.

[0035] The central shaft connector 1.6 is fixed to the rotary box cover 2.7 by bolts, thus connecting the central shaft assembly 1.0 to the rotary drive device 2.0. The outer ring of the upper bearing 3.1 is assembled to the rotary box cover 2.7, and the outer ring of the lower bearing 3.3 is assembled to the lower bearing housing 2.9 of the blade shaft, thus connecting the blade shaft assembly 3.0 to the rotary drive device 2.0. The central shaft assembly 1.0, the rotary drive device 2.0, and the blade shaft assembly 3.0, through the aforementioned connections and assemblies, together constitute an electrically driven straight-wing propulsion device.

[0036] The rotary motor stator coil 2.4 and rotary motor rotor coil 2.5 cause the rotary box 2.10 to rotate relative to the outer lower box 2.3. Since the outer lower box 2.3 is fixed to the hull, a revolution of an electrically driven straight-wing propulsion device can be achieved. The blade rotation motor 2.8 drives the blade shaft 3.2 to rotate, achieving the blade rotation of an electrically driven straight-wing propulsion device. The blade rotation provides thrust, and the blade revolution changes the direction of thrust. By precisely controlling the blade's rotation attitude during the revolution, propulsion effects under different operating conditions can be achieved.

[0037] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the invention. Those skilled in the art can make various changes and modifications without departing from the concept and scope of the present invention. Therefore, all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of the present invention.

Claims

1. An electrically driven straight wing propulsion device, characterized by: The system includes a central shaft assembly, a rotary drive device, and a blade shaft assembly. The rotary drive device includes an outer upper housing, an outer middle housing, an outer lower housing, a rotary motor stator coil, a rotary motor rotor coil, a blade shaft bearing end cover, a rotary box cover plate, a blade self-rotating motor, a blade shaft lower bearing seat, a rotary box housing, and a self-rotating motor seat. The central shaft assembly is fixedly connected to the rotary box cover plate in the rotary drive device via a central shaft connector. The rotary box cover plate is fixedly connected to the rotary box housing. The outer middle housing is fixedly connected to the hull. The outer upper housing is fixedly connected above the outer middle housing, and the outer lower housing is fixedly connected to... Below the outer middle housing, the rotor coil of the rotary motor is installed inside the outer lower housing, and the stator coil of the rotary motor is installed inside the rotary housing. Multiple sets of blade self-rotating motors and blade shaft assemblies are installed between the rotary housing cover and the rotary housing. The blade self-rotating motor is connected to the blade shaft in the blade shaft assembly. Through the stator coil and rotor coil of the rotary motor, the rotary housing rotates relative to the outer lower housing, realizing the revolution of the electric-driven straight-wing propulsion device. The blade self-rotating motor drives the blade shaft to rotate, realizing the blade self-rotation of the electric-driven straight-wing propulsion device.

2. An electrically driven straight wing propulsion device according to claim 1, characterized in that: The blades provide thrust by rotating on their own axis, and change the direction of thrust by revolving around the sun. By controlling the rotational attitude of the blades during the revolution, propulsion effects under different working conditions can be achieved.

3. An electrically driven straight wing propulsion device according to claim 1, characterized in that: The central shaft assembly includes a central shaft, a slip ring device, a central shaft bearing, a central shaft bearing housing, a central shaft seal, and a central shaft connector. The central shaft is fixedly connected to the central shaft connector by a bolt group. The central shaft bearing is installed in the central shaft bearing housing. The central shaft bearing housing and the central shaft seal are fixed by a bolt group to achieve the positioning of the central shaft bearing. The slip ring device and the central shaft bearing are assembled on the central shaft to form the central shaft assembly.

4. The electrically-driven straight wing propulsion device of claim 1, wherein: The blade shaft assembly includes an upper bearing, a blade shaft, a lower bearing, a blade shaft connecting flange, and blades. The blade shaft and blades are connected by the blade shaft connecting flange. The upper bearing and the lower bearing are assembled at the upper end and middle of the blade shaft, respectively, to form the blade shaft assembly.

5. An electrically-driven straight wing propulsion device according to claim 4, characterized in that: The blade shaft assembly is connected to the rotary box cover plate in the rotary drive device via an upper bearing, and to the lower bearing seat of the blade shaft in the rotary drive device via a lower bearing.

6. The electrically-driven straight wing propulsion device of claim 1, wherein: The blade shaft bearing end cover is fixedly connected to the rotary box cover plate, the blade self-rotating motor and the self-rotating motor seat are fixed by bolt group, and the blade shaft lower bearing seat and the self-rotating motor seat are fixed in the rotary box body by bolt group.

7. The electrically-driven hydrofoil propulsion device of claim 1, wherein: The rotary box cover plate is fixedly connected to the rotary box body by bolts.

8. The electrically-driven hydrofoil propulsion device of claim 1, wherein: There are four blade shaft bearing end caps, which are evenly distributed and fixed on the rotary box cover plate.

9. An electrically-driven straight wing propulsion device according to claim 8, characterized in that: The four sets of propeller self-rotating motors and self-rotating motor mounts are fixed together by bolt groups, and the blade shaft lower bearing seat and self-rotating motor mount are fixed together in the rotary box housing by bolt groups.

10. An electrically driven straight wing propulsion device according to any one of claims 1-9, characterized in that: The blade cross-section of the propeller blade adopts a symmetrical structure, which can improve the hydrodynamic performance of the blade.

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