CN109625223B - Pod type full-rotation ship electric propulsion system - Google Patents
Pod type full-rotation ship electric propulsion system Download PDFInfo
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- CN109625223B CN109625223B CN201811655171.2A CN201811655171A CN109625223B CN 109625223 B CN109625223 B CN 109625223B CN 201811655171 A CN201811655171 A CN 201811655171A CN 109625223 B CN109625223 B CN 109625223B
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- propeller
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- telescopic
- pod
- propeller hub
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
- B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
- B63H5/125—Arrangements on vessels of propulsion elements directly acting on water of propellers movably mounted with respect to hull, e.g. adjustable in direction, e.g. podded azimuthing thrusters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H1/00—Propulsive elements directly acting on water
- B63H1/02—Propulsive elements directly acting on water of rotary type
- B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
- B63H1/14—Propellers
- B63H1/20—Hubs; Blade connections
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
- B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
- B63H5/125—Arrangements on vessels of propulsion elements directly acting on water of propellers movably mounted with respect to hull, e.g. adjustable in direction, e.g. podded azimuthing thrusters
- B63H2005/1254—Podded azimuthing thrusters, i.e. podded thruster units arranged inboard for rotation about vertical axis
- B63H2005/1258—Podded azimuthing thrusters, i.e. podded thruster units arranged inboard for rotation about vertical axis with electric power transmission to propellers, i.e. with integrated electric propeller motors
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
The invention discloses a pod type full-rotation ship electric propulsion system, which comprises at least one group of power generation units consisting of a prime motor and a generator set connected with the prime motor, wherein the electric energy output end of each power generation unit is sequentially connected with a frequency converter and a power output control system through cables, a pod type propeller with a synchronous motor inside is connected to the power output control system, a propeller hub is arranged at the end part of a propeller shaft, at least two blades are arranged along the circumferential direction of the propeller hub, and a telescopic mechanism and a power mechanism are arranged on the propeller hub and used for driving the blades to extend outwards along the diameter direction of the propeller hub. The plurality of telescopic parts which are arranged on the surface of the propeller hub and can slide outwards along the diameter direction of the propeller hub can change the diameter of the propeller to change the propelling force of the propeller, thereby not only reducing the electric power cost, but also prolonging the service life of the whole electric propulsion system and avoiding the cavitation phenomenon.
Description
Technical Field
The invention relates to the technical field of ship equipment, in particular to a pod type full-rotation ship electric propulsion system.
Background
The pod type electric propulsion system is called as a permanent magnet motor pod type full-rotation rudder-free electric propulsion system. The propulsion motor is not in the ship body but under water, is integrated with the propeller, and does not have a rudder. The whole pod type propeller can rotate 360 degrees in the horizontal direction, just like a vector nozzle used by a modern military aircraft engine, the navigation direction can be adjusted by rotating the direction of the pod, the pod type propeller can freely advance and retreat, various high-difficulty actions such as transverse movement and in-situ rotation can be completed, and the maneuverability of the ship are greatly improved. The propulsion mode has high energy conversion efficiency because no energy loss of mechanical transmission exists. In addition, such propulsion systems have several advantages, such as cabin space saving, great maneuverability and maneuverability, significant reduction in vessel vibration noise, etc. The tail shaft, the tail side thruster, the steering engine system and the like are eliminated, and a special cooling system is not needed, so that the cabin capacity is saved, and the installation is simplified. The space configuration is flexible, the three-dimensional arrangement can be realized in the whole space of the engine room, the convenience and flexibility are realized, the cabin capacity of the engine room is fully utilized, and great flexibility is provided for the design of a ship body, particularly the design of a stern and a centralized control room part. It is also possible to arrange the generators in different cabins in groups from fire and safety aspects (e.g. in the case of 6 generators for a whole ship, 3 generators in 1 group). The number of generators incorporated into the power grid is determined according to the needs, so that each unit can work under a relatively ideal load, thereby being beneficial to good combustion of the diesel engine and use of heavy oil, and reducing the maintenance work and the spare part cost. The pod type electric propulsion system can adopt a 'double-engine double-propeller' mode, and two sets of pod type propellers are arranged below the stern in parallel. The greatest benefit is that the boat is very flexible to handle and is also more safe, and if one of the propellers is broken, the other propeller can be used for work.
CN 202320761U discloses a pod type ship electric propulsion system device, which includes a driving console, a machine side console and a ship body control device, wherein the driving console is connected with the machine side console through a DP bus, the machine side console is connected with the ship body control device, and the machine side console is installed at one side of a pod. CN 103387043 a discloses an electric propulsion system for ships, that is, the driving operation control module of the system is provided with a speed control device control signal of the speed control module by a speed setting device and a console controller through a field bus, and the control information is displayed on a display unit; the cabin operation control module provides a speed regulation control device control signal of the speed regulation control module through a field bus by a cabin local controller, and control information is displayed in an indicating unit; the speed regulation control module controls the magnetic coupler through a speed regulation actuator by a speed regulation control device; the power propulsion module is composed of a steering controller, a motor, a propulsion device and a speed sensor, wherein the motor is connected with the propulsion device through a magnetic coupler, and the speed sensor detects the rotating speed and feeds the rotating speed back to the speed regulation control device. CN 107918378A relates to a ship electric propulsion monitoring device and method, the device includes monitoring device and controlling device, gather the state of the power supply system and electric propulsion system apparatus and control the operation of the electric propulsion system apparatus, the monitoring device is made up of industrial computer and application program compiled by high-level language, the controlling device is made up of two parts of safety controlling device and main controlling device; when the system runs, the safety control device collects important protection signals of the power supply system and the electric propulsion system equipment to determine the protection function of the system, the main control device collects equipment running signals and controls the normal running of the system according to the control logic, and the monitoring device collects signals of the control device, displays data, alarm, report forms and trends of the system through a friendly interface, and helps crews analyze abnormity through the interface playback function.
The electric propulsion system of the pod type ship flexibly connects the motor with the propulsion device, conveniently realizes the adjustment of load rotating speed and torque, avoids vibration transmission and noise superposition, prolongs the service life of components, reduces the maintenance cost of the system, and ensures the stable operation of the system. Compared with the propeller with the conventional rudder propeller structure, the pod type electric propulsion system has a wide application prospect due to the advantages of the pod type electric propulsion system, so the pod type electric propulsion system is in a leading position in the field of electric propulsion of ships, becomes a main research and development direction in the field of electric propulsion of ships, and becomes one of the development directions of ship propulsion in both technology and market.
However, both a pod type propeller and a conventional rudder propeller have an unsolvable problem at present, namely cavitation of the blades and the pod type propeller under different conditions, and the pressure fluctuation generated when the propeller runs can cause more cavitation erosion. In seawater at 20 ℃, if a low pressure below 2338.8pa occurs locally, the seawater will boil and generate bubbles, i.e. vacuoles. The propeller drives the surrounding liquid to flow at a high speed when rotating, because the liquid on the front side is thrown away by the propeller, because a large amount of liquid is thrown away from the front side and the surrounding liquid cannot be supplemented into the propeller, a certain vacuum is formed on the back side of the propeller, at the moment, air contained in the liquid overflows, bubbles are formed on the back side, and the bubbles are crushed along with the extrusion of the liquid, so that cavitation corrosion is formed, the cavitation corrosion not only easily generates strong cavitation noise and causes serious erosion to blades, but also can cause the propeller to break when serious, but also can affect the propelling efficiency of the propeller, and the using quality of the propeller is seriously affected. In order to reduce the occurrence of cavitation, the propeller is mainly provided with an anti-cavitation barrel, for example, CN1440346A discloses an anti-cavitation barrel for a marine propeller. The technology is worthy of confirming that the lifting force can be generated when water flows through the pipe barrel, and the thrust transmission efficiency of the engine is improved. However, the cavitation principle is that the liquid flows at a high speed instantaneously, and the high-speed liquid flow is caused by the high-speed rotation of the propeller, so that the critical speed of the propeller for generating cavitation needs to be reduced to solve the cavitation problem, but the problem is a contradiction, the rotating speed of the propeller is low, the required navigational speed of the ship cannot be achieved, and the cavitation cannot be avoided when the rotating speed is high. Because the propeller works in the non-uniform flow field behind the ship, the thrust and torque generated by the propeller can generate periodic pulsation due to the non-uniform flow field of seawater, namely the pulsation force acts on the blades and is not a constant force, the two technical schemes that the propeller capable of changing the propeller diameter and the propeller capable of changing the propeller diameter disclosed by CN 105620728A and the propeller capable of changing the propeller diameter and disclosed by CN 104943853A are adopted, the propeller diameter size of the propeller is controlled according to the centrifugal force of the blades, the propeller diameter changing in the true sense can not be realized by a self-driving mode generated by the centrifugal force, the stable propelling force can not be obtained, and the problem of cavitation caused by the fact that the rotating speed is too high by changing the propeller diameter can not be solved. Therefore, the problem is always a great problem in military and civil ships to restrict the development of the ship industry.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to solve the technical problem of providing the nacelle type full-rotation ship electric propulsion system which is simple in structure, convenient to control, capable of effectively improving the critical speed of cavitation of the propeller and greatly reducing impact damage of cavitation to blades while ensuring the propulsion efficiency of the propeller.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a pod type full-rotation ship electric propulsion system comprises at least one group of power generation units consisting of a prime motor and a generator set connected with the prime motor, wherein the electric energy output end of the power generation unit is sequentially connected with a frequency converter and a power output control system through cables, a pod type propeller with a synchronous motor inside is connected to the power output control system, the pod type propeller comprises a pod shell, the synchronous motor is arranged in the pod shell, a propeller coaxially connected with a rotating shaft of the synchronous motor is arranged outside the pod shell, a steering upright post used for driving the pod shell to rotate 360 degrees in the vertical direction is arranged at the top of the pod shell, the propeller comprises a propeller shaft coaxially connected with the rotating shaft of the synchronous motor, a propeller hub is arranged at the end part of the propeller shaft, and at least two blades are arranged along the circumferential direction of the propeller hub, the propeller hub is provided with a telescopic mechanism used for driving the blades to extend outwards along the diameter direction of the propeller hub, and a power mechanism used for driving the telescopic mechanism to act.
The nacelle type full-revolving ship electric propulsion system comprises a plurality of telescopic parts which are arranged on the surface of a hub and can slide outwards along the diameter direction of the hub, blades are respectively arranged on the telescopic parts, a sliding groove for guiding the blades to extend out and retract along the diameter direction of the hub is formed in the surface of the hub, and a sliding block in sliding fit with the sliding groove is arranged on the telescopic parts.
The pod type full-rotation ship electric propulsion system comprises a power mechanism, a telescopic oil cylinder, a piston rod of the telescopic oil cylinder, an oil storage pipe and a hydraulic pump, wherein the telescopic oil cylinder is arranged in a propeller hub and connected with each telescopic component and used for driving a blade to extend out and retract, the piston rod of the telescopic oil cylinder is connected with the telescopic component, the propeller hub is provided with the oil storage pipe used for supplying oil to the telescopic oil cylinder along the axis direction of a propeller shaft, the oil storage pipe is connected with the hydraulic pump used for supplying oil to each telescopic oil cylinder, and the hydraulic pump is connected with an oil storage cavity and the telescopic oil.
In the pod type full-rotation ship electric propulsion system, the telescopic component comprises two telescopic plate bodies which are respectively in sliding fit with the upper surface and the lower surface of the propeller hub, an arc-shaped connecting plate with the same curvature radius as that of the outer end edge of the propeller hub is connected between the two telescopic plate bodies, and the piston rod is connected with the inner wall of the arc-shaped connecting plate.
In the pod-type full-slewing ship electric propulsion system, the oil storage pipe comprises a circular shell which is coaxial with the hub and provided with an oil storage cavity, the propeller shaft penetrates through the circular shell and is fixed with the hub through the oil storage cavity, the outer end of the circular shell is fixed on the propeller shaft, and the inner end of the circular shell extends into the hub and is fixed with the hub.
In the pod type full-rotation ship electric propulsion system, the sliding grooves are formed in parallel along the diameter direction of the hub.
In the pod type full-rotation ship electric propulsion system, the synchronous motor is a permanent magnet type synchronous motor.
The nacelle type full-rotation ship electric propulsion system has the advantages that: the propeller and the synchronous motor are coaxial, and no other link exists between the propeller and the synchronous motor, so that the structure is simple and compact. Compared with the traditional adjusting mode that the rotating speed of the propeller can be improved only by increasing the output power, the invention can change the diameter of the propeller to change the propelling force of the propeller by a plurality of telescopic components which are arranged on the surface of the propeller hub and can slide outwards along the diameter direction of the propeller hub under the condition of controlling the rotating speed of a propelling motor to be constant, thereby not only reducing the electric power cost, but also prolonging the service life of the whole electric propulsion system, avoiding the occurrence of cavitation, protecting the blades of the propeller, obtaining the required propelling force at the relatively low rotating speed of the propeller, reducing the rotating speed of the propeller to a certain degree, improving the critical speed of the propeller generating cavitation, improving the hydrodynamic force and noise performance of the propeller, reducing the vibration and cavitation erosion of the propeller, reducing the attached body resistance and improving the efficiency of the propeller, and simultaneously, the ship sails quieter. The invention combines the pod and the rudder into a whole, reserves modules such as a propeller, the pod and the like, cancels a complex rotating device, and can realize the ship control performance through the rudder while ensuring the ship propulsion performance. Therefore, most advantages of flexible arrangement, small vibration, low noise and the like of the full-rotation nacelle propeller are reserved, and the defects of complex structure and high price of the full-rotation nacelle propeller are overcome. The effective diameter of the propeller and the area of the propeller disk are changed, so that the thrust of the propeller is changed, and the continuous change of the thrust of the propeller is realized.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of a pod thruster configuration;
FIG. 3 is an enlarged view of the structure of the propeller;
FIG. 4 is an enlarged view of a connection structure of a propeller and a synchronous motor;
fig. 5 is an enlarged view of a portion a of fig. 4.
Detailed Description
The invention is further explained in detail with reference to the drawings and the specific embodiments;
as shown in fig. 1, 2, 3, 4 and 5, a pod-type full-rotation ship electric propulsion system comprises at least one set of power generation unit 3 consisting of a prime mover 1 and a generator set 2 connected with the prime mover 1, wherein the prime mover 1 is a diesel engine, and the diesel engine on the ship is not used as a main propulsion device but used as a prime mover for power generation to drive the motor to generate power. They are usually four-stroke medium-speed diesel engines of the same type and output power. The ship adopting the full electric propulsion system can randomly adjust the running number of the generator set 2 according to the change of the ship speed, the change of the displacement and the change of the electric load on the ship, maintain high-efficiency running and reduce the consumption of fuel, thereby having better economical efficiency.
The electric energy output end of the power generation unit 3 is sequentially connected with a frequency converter 5 and a power output control system 6 through a cable 4, the power output control system 6 is connected with a pod type propeller 8 with a synchronous motor 7 inside, and the synchronous motor 7 is a permanent magnet type synchronous motor in the application. Compared with an asynchronous motor, the synchronous motor has stronger bearing capacity to torque disturbance and can have quicker response. In the synchronous motor, as long as the power angle of the motor is properly changed, the rotating speed is always kept unchanged at the original synchronous rotating speed, and the inertia of the rotating part does not influence the synchronous motor to quickly respond to the change of the torque. From the view of the rotating speed adjusting range, the synchronous motor rotor has excitation, can run even under very low frequency, and has wider speed adjusting range. The electric propulsion ship cancels a steering engine system, and more than two sets of propulsion systems are often adopted, and the propulsion systems can be mutually standby on the premise of ensuring the total propulsion power of the ship, so that the possibility of ship failure and ship paralysis between two ports is basically eliminated.
The pod type propeller 8 comprises a pod shell 9, a synchronous motor 7 is arranged in the pod shell 9, a propeller 11 coaxially connected with a rotating shaft 10 of the synchronous motor 7 is arranged outside the pod shell 9, a steering column 12 used for driving the pod shell 9 to rotate for 360 degrees along the vertical direction is arranged at the top of the pod shell 9, the propeller 11 comprises a propeller shaft 13 coaxially connected with the rotating shaft 10 of the synchronous motor 7, a hub 14 is arranged at the end part of the propeller shaft 13, at least two blades 15 are arranged along the circumferential direction of the hub 14, a telescopic mechanism 16 used for driving the blades 15 to extend outwards along the diameter direction of the hub 14 and a power mechanism 17 used for driving the telescopic mechanism 16 to act are arranged on the hub 14.
The telescoping mechanism 16 includes a plurality of telescoping parts which are arranged on the surface of the hub 14 and can slide outwards along the diameter direction of the hub 14, each blade 15 is respectively arranged on each telescoping part, a sliding groove 18 which guides the blade 15 to extend and retract along the diameter direction of the hub 14 is arranged on the surface of the hub 14, and in order to realize better stability when the blade extends and retracts, the sliding grooves 18 are arranged in parallel along the diameter direction of the hub 14. The telescopic member is provided with a slider 19 which is slidably fitted to the slide groove 18. The telescopic part comprises two telescopic plate bodies 20 which are respectively matched with the upper surface and the lower surface of the propeller hub 14 in a sliding way, and an arc-shaped connecting plate 21 with the same curvature radius as the outer end edge of the propeller hub 14 is connected between the two telescopic plate bodies 20. The power mechanism 17 comprises a telescopic oil cylinder 22 which is arranged in the propeller hub 14 and connected with each telescopic component for driving the blades 15 to extend and retract, a piston rod 23 of the telescopic oil cylinder 22 is connected with the inner wall of the arc-shaped connecting plate 21, an oil storage pipe 24 for supplying oil to the telescopic oil cylinder 22 is arranged on the propeller hub 14 along the axial direction of the propeller shaft 13, the oil storage pipe 24 comprises a circular shell 26 which is coaxially arranged with the propeller hub 14 and is provided with an oil storage cavity 25, the propeller shaft 13 penetrates through the circular shell 26 and is fixed with the propeller hub 14 through the oil storage cavity 25, the outer end of the circular shell 26 is fixed on the propeller shaft 13, and the inner end of the circular shell extends into the propeller hub 14 and is fixed with the propeller hub 14. A hydraulic pump 27 for supplying oil to each telescopic cylinder 22 is connected to the oil storage pipe 24, and the hydraulic pump 27 is connected to the oil storage chamber 25 and the telescopic cylinder 22 through oil supply lines 28.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art should understand that they can make various changes, modifications, additions and substitutions within the spirit and scope of the present invention.
Claims (5)
1. The utility model provides a nacelle formula full-circle swinging vessel electric propulsion system, includes at least a set of generating unit who comprises prime mover and the generating set who is connected with the prime mover, the electric energy output of generating unit has connected gradually converter, power output control system, its characterized in that through the cable: the power output control system is connected with a pod type propeller with a synchronous motor inside, the pod type propeller comprises a pod shell, the synchronous motor is arranged in the pod shell, a propeller coaxially connected with a rotating shaft of the synchronous motor is arranged outside the pod shell, a steering upright post for driving the pod shell to rotate for 360 degrees along the vertical direction is arranged at the top of the pod shell, the propeller comprises a propeller shaft coaxially connected with the rotating shaft of the synchronous motor, a propeller hub is arranged at the end part of the propeller shaft, at least two blades are arranged along the circumferential direction of the propeller hub, a telescopic mechanism for driving the blades to extend outwards along the diameter direction of the propeller hub and a power mechanism for driving the telescopic mechanism to act are arranged on the propeller hub, the telescopic mechanism comprises a plurality of telescopic parts which are arranged on the surface of the propeller hub and can slide outwards along the diameter direction of the propeller hub, each blade is respectively arranged on each telescopic component, a sliding groove for guiding the blade to extend out and retract along the diameter direction of the hub is formed in the surface of the hub, a sliding block in sliding fit with the sliding groove is arranged on each telescopic component, the power mechanism comprises a telescopic oil cylinder which is arranged in the hub and connected with each telescopic component and used for driving the blade to extend out and retract, a piston rod of each telescopic oil cylinder is connected with each telescopic component, an oil storage pipe for supplying oil to each telescopic oil cylinder is arranged on the hub along the axis direction of the propeller shaft, a hydraulic pump for supplying oil to each telescopic oil cylinder is connected onto the oil storage pipe, and the hydraulic pump is respectively connected with the oil storage cavity and the telescopic oil cylinder through oil supply pipelines.
2. The pod-type full-slewing marine electric propulsion system according to claim 1, wherein: the telescopic component comprises two telescopic plate bodies which are respectively in sliding fit with the upper surface and the lower surface of the propeller hub, an arc-shaped connecting plate with the same curvature radius as the outer end edge of the propeller hub is connected between the two telescopic plate bodies, and the piston rod is connected with the inner wall of the arc-shaped connecting plate.
3. The pod-type full-slewing marine electric propulsion system according to claim 2, wherein: the oil storage pipe comprises a circular shell which is coaxial with the propeller hub and is provided with an oil storage cavity, the propeller shaft penetrates through the circular shell and is fixed with the propeller hub through the oil storage cavity, the outer end of the circular shell is fixed on the propeller shaft, and the inner end of the circular shell extends into the propeller hub and is fixed with the propeller hub.
4. The pod-type full-slewing marine electric propulsion system according to claim 3, wherein: the sliding grooves are arranged in parallel along the diameter direction of the propeller hub.
5. The pod-type full-slewing marine electric propulsion system according to claim 4, wherein: the synchronous motor is a permanent magnet type synchronous motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811655171.2A CN109625223B (en) | 2018-12-27 | 2018-12-27 | Pod type full-rotation ship electric propulsion system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811655171.2A CN109625223B (en) | 2018-12-27 | 2018-12-27 | Pod type full-rotation ship electric propulsion system |
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| CN109625223A CN109625223A (en) | 2019-04-16 |
| CN109625223B true CN109625223B (en) | 2020-10-13 |
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| CN201811655171.2A Active CN109625223B (en) | 2018-12-27 | 2018-12-27 | Pod type full-rotation ship electric propulsion system |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110920848A (en) * | 2019-11-27 | 2020-03-27 | 西安中车永电电气有限公司 | Pure battery ship full-rotation rudder propeller system and suspension type electric propulsion and control system |
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| US7637722B1 (en) * | 2006-09-26 | 2009-12-29 | Brunswick Corporation | Marine propeller |
| CN101857082A (en) * | 2009-04-02 | 2010-10-13 | 第一电气株式会社 | Electric propulsion system for ships |
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| CN102991658A (en) * | 2012-12-06 | 2013-03-27 | 哈尔滨工程大学 | Bionic propeller of ship |
| CN204871558U (en) * | 2015-07-31 | 2015-12-16 | 深圳市森派新能源科技有限公司 | Electronic towboat and driving system thereof |
| US9745948B1 (en) * | 2013-08-30 | 2017-08-29 | Brunswick Corporation | Marine propeller and method of design thereof |
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| US20090185909A1 (en) * | 2008-01-22 | 2009-07-23 | Sunonwealth Electric Machine Industry Co., Ltd. | Self-assembly micro blade |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07196084A (en) * | 1994-01-07 | 1995-08-01 | Ishikawajima Harima Heavy Ind Co Ltd | Propeller for ship |
| CN1596500A (en) * | 2001-11-29 | 2005-03-16 | 西门子公司 | Boat propulsion system |
| KR20060033088A (en) * | 2004-10-14 | 2006-04-19 | 부산대학교 산학협력단 | Asymmetric pre-swirl stator for cavitation suppression |
| US7637722B1 (en) * | 2006-09-26 | 2009-12-29 | Brunswick Corporation | Marine propeller |
| CN101857082A (en) * | 2009-04-02 | 2010-10-13 | 第一电气株式会社 | Electric propulsion system for ships |
| CN102001430A (en) * | 2010-11-17 | 2011-04-06 | 哈尔滨工程大学 | Variable-diameter propeller |
| CN102991658A (en) * | 2012-12-06 | 2013-03-27 | 哈尔滨工程大学 | Bionic propeller of ship |
| US9745948B1 (en) * | 2013-08-30 | 2017-08-29 | Brunswick Corporation | Marine propeller and method of design thereof |
| CN204871558U (en) * | 2015-07-31 | 2015-12-16 | 深圳市森派新能源科技有限公司 | Electronic towboat and driving system thereof |
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| CN109625223A (en) | 2019-04-16 |
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