CN107676214A - Rudder ball turbine generator after a kind of marine propeller - Google Patents
Rudder ball turbine generator after a kind of marine propeller Download PDFInfo
- Publication number
- CN107676214A CN107676214A CN201710805735.5A CN201710805735A CN107676214A CN 107676214 A CN107676214 A CN 107676214A CN 201710805735 A CN201710805735 A CN 201710805735A CN 107676214 A CN107676214 A CN 107676214A
- Authority
- CN
- China
- Prior art keywords
- rudder
- propeller
- turbine
- ball
- rudder ball
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B3/00—Machines or engines of reaction type; Parts or details peculiar thereto
- F03B3/12—Blades; Blade-carrying rotors
- F03B3/125—Rotors for radial flow at high-pressure side and axial flow at low-pressure side, e.g. for Francis-type turbines
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/18—Structural association of electric generators with mechanical driving motors, e.g. with turbines
- H02K7/1807—Rotary generators
- H02K7/1823—Rotary generators structurally associated with turbines or similar engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2240/00—Components
- F05B2240/90—Mounting on supporting structures or systems
- F05B2240/93—Mounting on supporting structures or systems on a structure floating on a liquid surface
- F05B2240/931—Mounting on supporting structures or systems on a structure floating on a liquid surface which is a vehicle
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
Abstract
The invention belongs to turbogenerator field, is related to rudder ball turbine generator after a kind of marine propeller, solves the problems, such as propeller for vessels wake energy recovery, including rudder ball, turbine, direct drive generator, frequency converter, cable and sub- rudder in the prior art；The center line of rudder ball overlaps with the paddle shaft of propeller, in front of main rudder, face paddle shaft center；Turbine is located on rudder ball, and rudder ball is arranged on the power transmission shaft of direct drive generator, and direct drive generator is connected by cable with frequency converter.Sub- rudder is arranged on main rudder rear.Rudder ball is oval revolving body, a diameter of 0.2~0.3 times of airscrew diameter.Card where turbo blade is usually taken to be 0.15~0.3 times of airscrew diameter with propeller disc interplanar distance.The present invention realizes the recovery of screw current rotating energy, and the endurance to improving ship, the combination property for improving ship plays an important roll, while the overall process for also having promoted ship energy saving to study.
Description
Technical field
The invention belongs to rudder ball turbine generator behind turbogenerator field, more particularly to a kind of marine propeller.
Background technology
Present energy problem worldwide oneself through turning into one of focal issue, while with fuel price it is rapid on
Rise, various countries oneself through starting power saving has been put on into agenda.As one of current main conveyance, it is saved boat public affairs oceangoing ship
The quality of effect has a great impact to national economy.Therefore various countries' shipbuilding and shipping sector are to reducing the energy of Shipping
Consumption, increases economic efficiency, therefore the exploitation of marine energy-saving technology also receives much concern with using.
In order that ship can keep certain speed to navigate by water, it is necessary to supply the certain thrust of ship (or pulling force) to overcome it
Suffered resistance.Propeller is typically all to produce thrust to later by drying, and current by the effect of propeller obtain with
The opposite addition speed of thrust direction (commonly referred to as induced velocity).The current feelings that the active force of obvious propeller is formed with it
Condition is closely relevant.Quarter current energy possessed by after propeller acceleration, which can account for, promotes the 15% 1 of gross energy
30%, this has resulted in the loss of energy, is restricted the raising of propeller efficiency.The energy percentage taken away from wake flow
From the point of view of, this part energy, which is recycled, can largely improve propeller efficiency.With marine energy-saving technology
Development, the recovery for the energy taken away to wake flow after propeller have become one of important content of marine energy-saving technology research.
With being skyrocketed through for oil price, various countries' shipping an urgent demand exploitation ship power-saving technology, to reduce fuel oil
Expense.Initial people are conceived on the main frame of fuel consumption, develop the long-stroke energy-saving main frame of Multiple Type, this master in succession
The thermal efficiency of machine is considerably beyond steam turbine and gas turbine.Afterwards, it is attempted to further improve thermal effect on this basis
During rate, find to pay costs dearly and saves and produce effects less, then has to separately ward off energy-conservation path.It is engaged in vessel fluid performance
The scholars of research have found that the very disorderly flow field of ship afterbody consumes the Partial Power of main frame in vain.Scholars taste one after another
Examination increases attached body in afterbody, to reduce the energy loss of wake flow, improves propulsive efficiency.The work of various hydrodynamic force energy-conservation attachment devices
With mainly having:(1) improve propeller influent stream, be allowed to more uniform；(2) additional thrust is produced；(3) stream is prewhirled before making oar, original
The rotational energy for losing in wake flow is converted into thrust work(；(4) the current segregation phenomenon of stern is reduced.Obtained in these devices relatively aobvious
Write having for energy-saving effect:Compensating duct, Preadipocyte factor-1, rudder ball, rudder additionaling thrust manch, impeller is fixed after oar, Grim rotates freely leaf
Take turns, rectification fin etc. before oar.
Propeller causes water flow rotary backward by rotating the thrust produced forward, causes 15%~30% spiral shell
Rotation oar energy is remained among wake flow in the form of kinetic energy, how to reclaim the production that this portion of energy promotes a variety of energy-conservation propulsion plants
It is raw, such as to turning oar, Grim impellers etc..Although the hydrodynamic performance of these devices is all fine in theory, in practice some
Device but because it is various the reason for can not be applied.For example to turning oar, mounting cost is very high, and complicated transfer system
System maintenance is got up pretty troublesome, limits its use；And the diameter of Grim impellers is generally 1.15~1.3 times of bow oar diameter, directly
Footpath is very big, but blade is narrow and thin, too harsh to strength of materials requirement, is also difficult to manufacture for current material technology level
Go out preferable Grim impellers.
The patent of Application No. 201420178955.1, " marine impellers electricity generation system ", being installed additional after propeller can be free
The impeller of rotation, paddle shaft is divided into interior outer shaft, outer shaft driving bow oar rotation, and interior axle is then by impeller-driven.Impeller is in bow oar
Rotated in the presence of wake flow, and electrical power generators are driven by impeller interior axle.The invention exists clearly disadvantageous, and tail is rotated after oar
Stream is acted on impeller, and impeller can be made to produce the power opposite with direction of ship travel, reduces the propulsive efficiency of whole system.Simultaneously
Its shafting structure is complicated, and interior outer shaft is respectively by impeller-driven after oar and driving bow oar, it is difficult to popularization and application.
In the case where vigorously advocating the overall background of energy-saving and emission-reduction now, exploitation screw current rotating energy retracting device will be into
For the Main Topics of ship energy saving.
The content of the invention
It is an object of the invention to provide rudder ball turbine generation after a kind of marine propeller of recovery screw current rotating energy
Device.
The object of the present invention is achieved like this：
Rudder ball turbine generator after a kind of marine propeller, including rudder ball 2, turbine 3, direct drive generator 4, frequency converter 5, electricity
Cable 8 and sub- rudder 11；The center line of rudder ball 2 overlaps with the paddle shaft 6 of propeller 1, positioned at the front of main rudder 10, the center of face paddle shaft 6；Whirlpool
On rudder ball 2, rudder ball 2 is arranged on the power transmission shaft 7 of direct drive generator 4 wheel 3, and direct drive generator 4 is by cable 8 with becoming
Frequency device 5 is connected.Sub- rudder 11 is arranged on the rear of main rudder 10.
Rudder ball 2 is oval revolving body, a diameter of 0.2~0.3 times of the diameter of propeller 1.
Card where the blade of turbine 3 is usually taken to be 0.15~0.3 times of the diameter of propeller 1 with the card spacing of propeller 1.
Beneficial effects of the present invention are：
The present invention realizes the recovery of screw current rotating energy, the endurance to improving ship, improves ship
Combination property plays an important roll, while the overall process for also having promoted ship energy saving to study.
Brief description of the drawings
Fig. 1 is rudder ball turbine generator overall construction drawing after a kind of marine propeller；
Fig. 2 is rudder ball turbine generator wake flow contraction schematic diagram after a kind of marine propeller；
Fig. 3 a are propeller speed polygonals；
Fig. 3 b are turbine trip speed polygonals.
Embodiment
Illustrate the present invention below in conjunction with the accompanying drawings.
Such as Fig. 1, rudder ball turbine generator after a kind of marine propeller, including rudder ball 2, turbine 3, direct drive generator 4, frequency conversion
Device 5, cable 8 and sub- rudder 11.The center line of rudder ball 2 overlaps with paddle shaft 6, and turbine 3 is located on rudder ball 2, and rudder ball 2 is arranged on direct-drive type
On the power transmission shaft 7 of generator 4, direct drive generator 4 is connected by cable 8 with frequency converter 5.After sub- rudder 11 is arranged on main rudder 10
Side.Rudder ball 2 is oval revolving body, positioned at the front of main rudder 10, the center of face paddle shaft 6.
Propeller 1 is driven by marine main engine, and propeller rotates wake effect on turbine 3, before driving turbine 3 and rudder ball 2
End rotation, and drive power transmission shaft 7 to rotate, direct drive generator 4 of the drive arrangement in rudder generates electricity, and passes through cable 8 and arrangement
It is connected in the frequency converter 5 of cabin 9, so as to be incorporated to the main power network of ship, extra electric energy is provided for the normal operation of ship.
Rudder ball 2 is oval revolving body, positioned at the front of main rudder 10, the center of face paddle shaft 6, the front end Yu Grains cap spacing of rudder ball 2
It is as far as possible small but to meet actual installation technological requirement, the dismounting of the He Grains caps of propeller 2 should be facilitated.The diameter of rudder ball 2 is about 0.2~
0.3 times of diameter D of propeller 1p.Card is usually taken to be the diameter D of propeller 1 with the card space D of propeller 1 where the blade of turbine 3p's
0.15-0.3 times, in order to avoid bow oar tip vortex pair turbine 3 produces impact, according to the trailing vortex of propeller 1 at the place card of turbine 3
Shrinkage factor determines the diameter of turbine 3, as shown in Figure 2.In order that the rotating energy of the trailing vortex of propeller 1 can be returned to greatest extent
Receive and take into account structural strength safety, typically 5~8 blades of installation of turbine 3 are similar to the turbine section of Grim impellers in structure, directly
Footpath is obviously reduced for comparing Grim impellers, the problem of avoiding strength of materials deficiency.By adjusting generator loading, rudder ball-
The rotating speed of turbine also can adjust, and under optimal operational condition, the rotating speed of rudder ball-turbine is generally the 0.15~0.3 of revolution speed of propeller
Times or so, avoid Grim impellers and rotate freely the caused harmful effect under some operating modes.
When the propeller rotates, Grains caps rear can form strong strong Grains whirlpools, after installing rudder ball on rudder, can dissipate Grains to beat
Whirlpool, Xi Shou Grains whirlpools energy, the surface pressing of Shi get Grains caps go up, and propeller is He Grains cap entirety thrust increases, so as to improve propulsion
Efficiency.
In propeller works, in addition to meeting Chan Sheng Grains whirlpools, the current of whole wake zone can produce circumferential rotation speed
Degree, on rudder ball after mounting turbine blades, turbine meeting and propeller rotating Vortex in the presence of wake flow is rotated, and drive rudder ball
Front end and power transmission shaft rotation, drive electrical power generators in rudder, screw current rotating energy are converted into electric energy, realizes energy-conservation
Purpose.
R is the dimensionless radius of propeller and turbine, and Fig. 3 a are propeller speed polygonal, and n is revolution speed of propeller in figure,
It is ship's speed V to enter speedp, its axial and circumferential self-induced velocity is respectively uapAnd utp, turbine lured the axial and circumferential of propeller
It is respectively u to lead speedaplAnd utpl；VRPFor the actual speed of incoming flow of blade element at propeller radius r；βi, β represent hydrodynamic force spiral shell respectively
Elongation and enter angle.Understand turbine to induced velocity u caused by propelleraplAnd utplWith the induced velocity u of propeller itselfapWith
utpIn the opposite direction, Hydrodynamic Performance on Propeller is improved.
Fig. 3 b are turbine trip speed polygonal, nL、DWFor secondary speed and diameter, it is ship's speed V that turbine, which enters speed,p, it is axially and all
It is respectively u to self-induced velocityalAnd utl, propeller is respectively u to the axial and circumferential induced velocity of turbinealpAnd utlp；VRL
For blade element speed of incoming flow at turbine radius r；βi, β represents hydrodynamic pitch angle and enters angle respectively.Understand, turbine itself is circumferential
Induced velocity utlWith the circumferential induced velocity u of propellertlpIn the opposite direction, so as to partly or entirely offsetting screw current
Rotation, so as to realize energy regenerating.
The present invention realizes the recovery of screw current rotating energy, the endurance to improving ship, improves ship
Combination property plays an important roll, while the overall process for also having promoted ship energy saving to study.
Here it must be noted that other unaccounted structures that the present invention provides are because be all the known knot of this area
Structure, according to title of the present invention or function, those skilled in the art can just find the document of related record, therefore not do
Further illustrate.
Claims (4)
1. rudder ball turbine generator after a kind of marine propeller, including rudder ball (2), turbine (3), direct drive generator (4), frequency converter
(5), cable (8) and sub- rudder (11)；It is characterized in that：The center line of rudder ball (2) overlaps with the paddle shaft (6) of propeller (1), is located at
In front of main rudder (10), face paddle shaft (6) center；Turbine (3) is located on rudder ball (2), and rudder ball (2) is arranged on direct drive generator
(4) on power transmission shaft (7), direct drive generator (4) is connected by cable (8) with frequency converter (5).
2. rudder ball turbine generator after a kind of marine propeller as claimed in claim 1, it is characterised in that：Described rudder ball (2)
For oval revolving body, a diameter of 0.2~0.3 times propeller (1) diameter.
3. rudder ball turbine generator after a kind of marine propeller as claimed in claim 1, it is characterised in that：Described sub- rudder
(11), installed in main rudder (10) rear.
4. rudder ball turbine generator after a kind of marine propeller as claimed in claim 1, it is characterised in that：Described turbine (3)
Card where blade is usually taken to be 0.15~0.3 times of propeller (1) diameter with propeller (1) card spacing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710805735.5A CN107676214A (en) | 2017-09-08 | 2017-09-08 | Rudder ball turbine generator after a kind of marine propeller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710805735.5A CN107676214A (en) | 2017-09-08 | 2017-09-08 | Rudder ball turbine generator after a kind of marine propeller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107676214A true CN107676214A (en) | 2018-02-09 |
Family
ID=61134586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710805735.5A Pending CN107676214A (en) | 2017-09-08 | 2017-09-08 | Rudder ball turbine generator after a kind of marine propeller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107676214A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108482625A (en) * | 2018-05-30 | 2018-09-04 | 上海交通大学 | A kind of ship combination propulsion device and installation method |
| CN108590924A (en) * | 2018-04-09 | 2018-09-28 | 刘宇 | A kind of synchronous ocean energy acquisition conversion equipment peculiar to vessel |
| CN108626060A (en) * | 2018-04-09 | 2018-10-09 | 刘宇 | A kind of synchronous ocean energy acquisition conversion equipment peculiar to vessel |
| CN109050861A (en) * | 2018-09-01 | 2018-12-21 | 哈尔滨工程大学 | A kind of vibration damping paddle shaft peculiar to vessel |
| CN113565665A (en) * | 2021-08-11 | 2021-10-29 | 哈尔滨工程大学 | Towed nacelle propeller capable of generating power by utilizing tidal current energy |
| WO2022214704A1 (en) | 2021-04-10 | 2022-10-13 | Mario Curcio | Energy recovery system for marine vessels |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0117881A1 (en) * | 1983-03-03 | 1984-09-12 | Licentia Patent-Verwaltungs-GmbH | Ship propulsion unit with a main and an auxiliary propeller |
| JPH03287488A (en) * | 1990-04-04 | 1991-12-18 | Mitsubishi Heavy Ind Ltd | Marine double-reverse propeller device with free rotating propeller |
| JPH11222188A (en) * | 1998-02-09 | 1999-08-17 | Hitachi Zosen Corp | Tip voltex energy recovery device for marine vessel |
| JP2002234491A (en) * | 2001-02-09 | 2002-08-20 | Ishikawajima Harima Heavy Ind Co Ltd | Contra-rotating propeller device |
| CN101898631A (en) * | 2010-07-23 | 2010-12-01 | 哈尔滨工程大学 | Rudder bulb type thrust fin-based rudder device |
| KR101323828B1 (en) * | 2011-06-08 | 2013-10-31 | 삼성중공업 주식회사 | Ship having energy recovery device |
| CN104443333A (en) * | 2014-11-28 | 2015-03-25 | 中国船舶重工集团公司第七○二研究所 | Rudder ball type contra-rotating propeller |
-
2017
- 2017-09-08 CN CN201710805735.5A patent/CN107676214A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0117881A1 (en) * | 1983-03-03 | 1984-09-12 | Licentia Patent-Verwaltungs-GmbH | Ship propulsion unit with a main and an auxiliary propeller |
| JPH03287488A (en) * | 1990-04-04 | 1991-12-18 | Mitsubishi Heavy Ind Ltd | Marine double-reverse propeller device with free rotating propeller |
| JPH11222188A (en) * | 1998-02-09 | 1999-08-17 | Hitachi Zosen Corp | Tip voltex energy recovery device for marine vessel |
| JP2002234491A (en) * | 2001-02-09 | 2002-08-20 | Ishikawajima Harima Heavy Ind Co Ltd | Contra-rotating propeller device |
| CN101898631A (en) * | 2010-07-23 | 2010-12-01 | 哈尔滨工程大学 | Rudder bulb type thrust fin-based rudder device |
| KR101323828B1 (en) * | 2011-06-08 | 2013-10-31 | 삼성중공업 주식회사 | Ship having energy recovery device |
| CN104443333A (en) * | 2014-11-28 | 2015-03-25 | 中国船舶重工集团公司第七○二研究所 | Rudder ball type contra-rotating propeller |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108590924A (en) * | 2018-04-09 | 2018-09-28 | 刘宇 | A kind of synchronous ocean energy acquisition conversion equipment peculiar to vessel |
| CN108626060A (en) * | 2018-04-09 | 2018-10-09 | 刘宇 | A kind of synchronous ocean energy acquisition conversion equipment peculiar to vessel |
| CN108482625A (en) * | 2018-05-30 | 2018-09-04 | 上海交通大学 | A kind of ship combination propulsion device and installation method |
| CN109050861A (en) * | 2018-09-01 | 2018-12-21 | 哈尔滨工程大学 | A kind of vibration damping paddle shaft peculiar to vessel |
| CN109050861B (en) * | 2018-09-01 | 2020-07-28 | 哈尔滨工程大学 | Marine damping propeller shaft |
| WO2022214704A1 (en) | 2021-04-10 | 2022-10-13 | Mario Curcio | Energy recovery system for marine vessels |
| CN113565665A (en) * | 2021-08-11 | 2021-10-29 | 哈尔滨工程大学 | Towed nacelle propeller capable of generating power by utilizing tidal current energy |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107676214A (en) | Rudder ball turbine generator after a kind of marine propeller | |
| CN100348458C (en) | Fish shape simulating nacelle propeller | |
| CN104443333A (en) | Rudder ball type contra-rotating propeller | |
| CN112960093A (en) | Tail vortex recovery device behind marine propeller | |
| CN205186502U (en) | Energy -conserving distortion rudder | |
| CN104061112A (en) | Flange power-generating water-spraying thruster | |
| CN107719610A (en) | A kind of ship turbine wheel rim generating towed PODDED PROPULSOR | |
| CN202368779U (en) | Energy-saving propeller | |
| CN203612187U (en) | Propeller for ship | |
| WO2011102103A1 (en) | Thruster with duct attached and vessel comprising same | |
| CN105438424B (en) | A kind of energy-conservation marine propeller of ending flap | |
| CN208306966U (en) | A kind of ship combination propulsion device | |
| CN211032982U (en) | Vortex-eliminating fin for adjustable propeller | |
| CN109969367B (en) | Spindle shaft vortex vane type vector propulsion device for ship | |
| CN103895850B (en) | A kind of combined energy-saving bracing strut device | |
| CN201559812U (en) | Ship propeller combination thruster with rotary-guide incoming flow and two-level rotary-spray noise reduction device | |
| KR101302035B1 (en) | A ship | |
| CN111806664A (en) | Pod propeller fin structure for increasing hydrodynamic performance | |
| CN103939262A (en) | Impeller power generation system for ship | |
| CN105109654A (en) | High-performance ducted propeller | |
| CN203835601U (en) | Marine impeller power generation system | |
| CN203473229U (en) | Kamsarmax bulk carrier with propeller containing energy-saving conduit | |
| CN207328794U (en) | A kind of multistage blade propulsion device with radome fairing | |
| CN111776177A (en) | Novel energy-saving device behind oar | |
| CN212267811U (en) | Underwater tandem type co-rotating propeller equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180209 |