CN110481741A - A kind of underwater propulsion unit - Google Patents
A kind of underwater propulsion unit Download PDFInfo
- Publication number
- CN110481741A CN110481741A CN201910788144.0A CN201910788144A CN110481741A CN 110481741 A CN110481741 A CN 110481741A CN 201910788144 A CN201910788144 A CN 201910788144A CN 110481741 A CN110481741 A CN 110481741A
- Authority
- CN
- China
- Prior art keywords
- cylinder
- cavity cylinder
- diversion division
- propulsion unit
- cavity
- 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.)
- Withdrawn
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63C—LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS
- B63C11/00—Equipment for dwelling or working underwater; Means for searching for underwater objects
-
- 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
- B63H1/26—Blades
-
- 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
- B63H1/28—Other means for improving propeller efficiency
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63C—LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS
- B63C11/00—Equipment for dwelling or working underwater; Means for searching for underwater objects
- B63C11/02—Divers' equipment
- B63C2011/028—Devices for underwater towing of divers or divers' sleds
Abstract
The invention proposes a kind of underwater propulsion units, comprising: cylinder；Cavity cylinder, is fixedly arranged in cylinder, and the lateral wall of cavity cylinder and the inner wall of cylinder limit runner；Driving device is fixedly arranged on the front end of cavity cylinder；Blade is driven, is fixedly arranged on the power output shaft of driving device；Multiple deflectors, it is extended to form from the lateral wall of cavity cylinder along the radial of cavity cylinder to cylinder, guide vane is located at the rear side of driving blade, wherein, from the front to the back, the first diversion division on front side of first deflector is gradually deviated to offset direction in the circumferential direction of cavity cylinder, and offset direction is contrary with driving blade rotation.Underwater propulsion unit provided by the invention, the first diversion division can be generated to fluid and water conservancy diversion blade direction of rotation opposite effect power, can reduce the velocity component after fluid is flowed out out of underwater propeller in cylinder circumferential direction, improves propulsive efficiency.The disturbance of water flow on rear side of underwater propeller is reduced simultaneously, reduces influence of the turbulent water to user.
Description
Technical field
The present invention relates to underwater equipment technical fields, in particular to a kind of underwater propulsion unit.
Background technique
Commonly with the underwater aircraft of multiple propellers, propeller axis is parallel to each other, and the axis and water of propeller
The direction of lower aircraft movement is parallel, and underwater aircraft volume is smaller.
Such product is in use, the propeller of propeller provide water cannot for propeller with the velocity component of rotation
Effective push.
Summary of the invention
The present invention is directed to solve at least one of the technical problems existing in the prior art or related technologies.
In view of this, the purpose of the present invention is to provide a kind of underwater propulsion units.
To achieve the goals above, technical solution of the present invention provides a kind of underwater propulsion unit, comprising: cylinder；It is empty
Chamber cylinder, is fixedly arranged in cylinder, and the lateral wall of cavity cylinder and the inner wall of cylinder limit runner；Driving device is fixedly arranged on sky
The front end of chamber cylinder；Blade is driven, is fixedly arranged on the power output shaft of driving device；Multiple deflectors, by the outer of cavity cylinder
Side wall is extended to form along the radial of cavity cylinder to cylinder, and guide vane is located at the rear side of driving blade, wherein from the front to the back,
The first diversion division on front side of deflector is gradually deviated to offset direction in the circumferential direction of cavity cylinder, offset direction and driving blade
What is rotated is contrary.
In the present solution, the first diversion division on front side of deflector is gradually deviated to offset direction in the circumferential direction of cavity cylinder,
Offset direction is contrary with driving blade rotation, can reduce after fluid is flowed out out of underwater propeller in cylinder circumferential direction
Velocity component, can be improved propulsive efficiency.
When driving blade work, driving blade rotation passes through the interaction between driving blade and fluid, fluid pair
Driving blade forms forward active force, so that underwater propeller advances.Wherein, water flow through driving blade after, flow through cylinder with
Runner between cavity cylinder, most propeller under the rear side outflow water through cylinder afterwards.After water flows through driving blade, in drum shaft
Velocity component is all had on the direction of line and driving blade rotation, and the direction of the first diversion division offset is walked around with driving blade
It is contrary, after fluid flows through the first diversion division, the first diversion division can to fluid generate it is opposite with water conservancy diversion blade direction of rotation
Active force, reduce velocity component of the fluid on driving blade direction of rotation, and then fluid can be reduced from underwater propulsion
Velocity component in device after outflow in cylinder circumferential direction, can be improved propulsive efficiency.
Further, when underwater propeller is hand-held propeller, since fluid flows out rear cylinder body out of underwater propeller
Velocity component in circumferential direction reduces, and can reduce the disturbance of water flow on rear side of underwater propeller, and then reduces turbulent water to user
Influence, reduce the difficulty that operates under water of user, the ease for use of underwater propeller is more preferable.
In the above-mentioned technical solutions, it is preferable that the first diversion division includes first side and second side, first side and
Two side faces are successively arranged on the direction of driving blade rotation, and the range of first side maximum bend angle is 6.8 °~28.1 °.
In any of the above-described technical solution, it is preferable that the angular range of driving blade torsional angle is 60.9~76.6 °.
In any of the above-described technical solution, it is preferable that deflector further include: the second diversion division is fixedly arranged on cavity cylinder
On lateral wall, the second diversion division is correspondingly connected on rear side of the first diversion division, wherein the second diversion division is along the axis side of cavity cylinder
To extension.
In any of the above-described technical solution, it is preferable that the second diversion division is by the lateral wall of cavity cylinder along cavity cylinder
It is radial to be extended to form to cylinder.
In any of the above-described technical solution, it is preferable that deflector is fixedly connected with the inner wall of cylinder.
In any of the above-described technical solution, it is preferable that further include: shield is fixedly arranged on front side of cylinder, and fluid is successively through anti-
Shield and driving blade flow into runner.
In any of the above-described technical solution, it is preferable that cavity cylinder and cylinder are coaxially disposed.
In any of the above-described technical solution, it is preferable that deflector is 3~5.
Additional aspect and advantage of the invention will become obviously in following description section, or practice through the invention
Recognize.
Detailed description of the invention
Fig. 1 is the side view of underwater propulsion unit part-structure according to an embodiment of the invention；
Fig. 2 is the front view of underwater propulsion unit part-structure according to an embodiment of the invention；
Fig. 3 is the side view of underwater propulsion unit part-structure according to an embodiment of the invention；
Fig. 4 is the front view of underwater propulsion unit part-structure according to an embodiment of the invention；
Fig. 5 is the cross-sectional view of underwater propulsion unit part-structure according to an embodiment of the invention；
Fig. 6 is the fluid emulation figure of underwater propulsion unit according to an embodiment of the invention；
Fig. 7 is the fluid emulation figure of underwater propulsion unit according to an embodiment of the invention.
Wherein, the corresponding relationship between appended drawing reference and component names of the Fig. 1 into Fig. 5 are as follows:
10 cylinders, 20 cavity cylinders, 30 driving devices, 40 driving blades, 50 deflectors, 51 first diversion divisions, 511 first
Side, 512 second sides, 52 second diversion divisions.
Specific embodiment
It is with reference to the accompanying drawing and specific real in order to be more clearly understood that the above objects, features and advantages of the present invention
Applying mode, the present invention is further described in detail.It should be noted that in the absence of conflict, the implementation of the application
Feature in example and embodiment can be combined with each other.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, still, the present invention may be used also
To be implemented using other than the one described here other modes, therefore, protection scope of the present invention is not by described below
Specific embodiment limitation.
According to some embodiments of the present invention referring to Fig. 1 to Fig. 5 description.
As shown in Figures 1 to 5, the embodiment provides a kind of underwater propulsion units, comprising: cylinder 10；Cavity
Cylinder 20 is fixedly arranged in cylinder 10, and the lateral wall of cavity cylinder 20 and the inner wall of cylinder 10 limit runner；Driving device 30,
It is fixedly arranged on the front end of cavity cylinder 20；Blade 40 is driven, is fixedly arranged on the power output shaft of driving device 30；Multiple deflectors
50, it is extended to form from the lateral wall of cavity cylinder 20 along the radial of cavity cylinder 20 to cylinder 10, guide vane is located at driving paddle
The rear side of leaf 40, wherein from the front to the back, the first diversion division 51 of the front side of deflector 50 in the circumferential direction of cavity cylinder 20 gradually to
Offset direction offset, offset direction rotate contrary with driving blade 40.
In the present solution, the first diversion division 51 is gradually deviated to offset direction in the circumferential direction of cavity cylinder 20, offset direction
It is contrary with the driving rotation of blade 40, the speed after fluid is flowed out out of underwater propeller in 10 circumferential direction of cylinder can be reduced
Component is spent, can be improved propulsive efficiency.
When driving blade 40 to work, driving blade 40 is rotated, by driving the interaction between blade 40 and fluid,
Fluid forms forward active force to driving blade 40, so that underwater propeller advances.Wherein, after water flows through driving blade 40,
The runner between cylinder 10 and cavity cylinder 20 is flowed through, most propeller under the rear side outflow water through cylinder 10 afterwards.Water flows through driving
After blade 40, velocity component is all had on the direction that 10 axis of cylinder and driving blade 40 rotate, and the first diversion division
51 offset directions with drive blade 40 walk around it is contrary, after fluid flows through the first diversion division 51,51 energy of the first diversion division
To fluid generation and water conservancy diversion blade direction of rotation opposite effect power, make speed point of the fluid on driving 40 direction of rotation of blade
Amount reduces, and then can reduce the velocity component after fluid is flowed out out of underwater propeller in 10 circumferential direction of cylinder, can be improved
Propulsive efficiency.
Further, when underwater propeller is hand-held propeller, since fluid flows out rear cylinder body out of underwater propeller
Velocity component in 10 circumferential directions reduces, and can reduce the disturbance of water flow on rear side of underwater propeller, so reduce turbulent water to
The influence at family, reduces the difficulty that user operates under water, and the ease for use of underwater propeller is more preferable.
As depicted in figs. 1 and 2, in the above embodiment, it is preferable that the first diversion division 51 includes first side 511 and the
Two side faces 512, first side 511 and second side 512 are successively arranged on the direction that driving blade 40 rotates, first side
511 maximum bend angles are the first sharp angle α, and the range of the first sharp angle α is 6.8 °~28.1 °.
Specifically, first side 511 is crossed to form the first intersection with the section perpendicular to 51 extending direction of the first diversion division
Line, wherein the tangent line of orthographic projection of the axis of cavity cylinder 20 on section and the first intersecting lens is in the first sharp angle α.
In the present solution, the maximum angle range of the first sharp angle α is 6.8 °~28.1 °, in the range, water can be flowed into
Row is preferably oriented to, and is reduced the velocity component after fluid is flowed out out of underwater propeller in 10 circumferential direction of cylinder and then is reduced water flow
Disturb the influence to user.
As shown in figure 3, in any of the above-described technical solution, it is preferable that the angular range of driving 40 torsional angle β of blade is 60.9
~76.6 °.
In the present solution, the angular range of driving 40 torsional angle β of blade is 60.9~76.6 °, cooperate first in above-described embodiment
The maximum angle range of sharp angle α can reduce the velocity component after fluid is flowed out out of underwater propeller in 10 circumferential direction of cylinder
And then reduce influence of the turbulent water to user.
In one embodiment of the invention, the maximum angle of the first sharp angle α is 6.8 °, drives the angle of 40 torsional angle β of blade
Degree is 60.9 °.
In one embodiment of the invention, the maximum angle of the first sharp angle α is 6.8 °, drives the angle of 40 torsional angle β of blade
Degree is 73 °.
In one embodiment of the invention, the maximum angle of the first sharp angle α is 6.8 °, drives the angle of 40 torsional angle β of blade
Degree is 76.6 °.
In one embodiment of the invention, the maximum angle of the first sharp angle α is 13 °, drives the angle of 40 torsional angle β of blade
It is 76.6 °.
In one embodiment of the invention, the maximum angle of the first sharp angle α is 19 °, drives the angle of 40 torsional angle β of blade
It is 76.6 °.
In one embodiment of the invention, the maximum angle of the first sharp angle α is 28.1 °, drives the angle of 40 torsional angle β of blade
Degree is 76.6 °.
As shown in Figure 1 and Figure 5, in any of the above-described embodiment, it is preferable that deflector 50 further include: the second diversion division 52,
It is fixedly arranged on the lateral wall of cavity cylinder 20, the second diversion division 52 is correspondingly connected to 51 rear side of the first diversion division, wherein second leads
Stream portion 52 extends along the axis direction of cavity cylinder 20.
In the present solution, the second diversion division 52 is correspondingly arranged with the first diversion division 51, and the second diversion division 52 is connected to
One diversion division, 51 rear side, the second diversion division 52 extends along the axis direction of cavity cylinder 20, in this way, the first diversion division 51 is to fluid
After being oriented to, the second diversion division 52 can further decrease velocity component of the fluid in 10 circumferential direction of cylinder, make through cylinder
The axis of fluid velocity and cylinder 10 that 10 rear sides flow out is parallel or nearly parallel, can reduce to greatest extent turbulent water to
The influence at family reduces the difficulty that user operates under water.
As shown in figure 5, in any of the above-described embodiment, it is preferable that the second diversion division 52 by cavity cylinder 20 lateral wall
Radial along cavity cylinder 20 extends to form to cylinder 10.
In the present solution, the second diversion division 52 is prolonged along the radial of cavity cylinder 20 to cylinder 10 from the lateral wall of cavity cylinder 20
It stretches to be formed, gap is not present between the second diversion division 52 and the lateral wall of cavity body, the turbulent flow in fluid course can be reduced,
And then energy loss is reduced, it can be improved propulsive efficiency, promote the continuation of the journey of underwater propeller.
In any of the above-described embodiment, it is preferable that the first diversion division 51 is fixedly connected with the inner wall of cylinder 10, and, second
Diversion division 52 is fixedly connected with the inner wall of cylinder 10.
In the present solution, the first diversion division 51 and the second diversion division 52 are fixed by cylinder 10 and cavity cylinder 20, it is not necessary to flow
Other connection structures are set in body runner, and then the turbulent flow in fluid course can be reduced, and then reduce energy loss, raising pushes away
Into efficiency, the continuation of the journey of underwater propeller is promoted.
In any of the above-described embodiment, it is preferable that further include: shield is fixedly arranged on 10 front side of cylinder, and fluid is successively through anti-
Shield and driving blade 40 flow into runner.
In the present solution, shield can prevent the impurity being relatively large in diameter from entering in fluid course knots such as destroying driving blade 40
Structure.
In any of the above-described embodiment, it is preferable that the section of cavity cylinder 20 is circle, and the section of cylinder 10 is circle,
Cavity cylinder 20 and cylinder 10 are coaxially disposed.
In the present solution, cavity cylinder 20 and cylinder 10 are coaxially disposed, to be capable of forming runner of the section as circular ring shape, make cylinder
Uniformly, the thrust at each position is identical for the rear side water outlet of body 10.
In any of the above-described embodiment, it is preferable that the first diversion division 51 is 3~5.
In scheme, deflector 50 is 3~5, can either be oriented at this time to fluid, to reduce fluid from underwater propulsion
Velocity component in device after outflow in 10 circumferential direction of cylinder；Meanwhile 3~5 deflectors are only set and can be reduced the energy damage of fluid
It loses, convenient for promoting the continuation of the journey of underwater propeller.
Wherein it is preferred to which deflector 50 is 3.
Wherein it is preferred to which deflector 50 is uniformly distributed along the circumferential direction of cavity cylinder 20.
Further preferably the first diversion division 51 of design and the second diversion division 52 is integrally formed, and enables 50 stress of deflector in this way
Uniformly.
It is further preferred that 10 lateral wall of cylinder is equipped with handle, in order to which user hand holds underwater propulsion unit in water
It advances.
The technical scheme of the present invention has been explained in detail above with reference to the attached drawings, underwater propulsion unit provided by the invention, and first
Diversion division 51 can be generated to fluid and water conservancy diversion blade direction of rotation opposite effect power, makes fluid in driving 40 direction of rotation of blade
On velocity component reduce, and then can reduce the speed after fluid flow out out of underwater propeller in 10 circumferential direction of cylinder divide
Amount, can be improved propulsive efficiency.
Further, when underwater propeller is hand-held propeller, since fluid flows out rear cylinder body out of underwater propeller
Velocity component in 10 circumferential directions reduces, and can reduce the disturbance of water flow on rear side of underwater propeller, so reduce turbulent water to
The influence at family, reduces the difficulty that user operates under water, and the ease for use of underwater propeller is more preferable.
As shown in Figure 6 and Figure 7, the flooded condition of underwater propeller is simulated in ANSYS software, wherein simulated conditions are driven
Dynamic 40 revolving speed 3000rpm of blade, 4 section of inflow velocity rotate wall surface, RNG turbulence model, and single precision solves, liquid water.
Propeller shell Resistance Value is 11.8N, about 1kgf.Therefore 5 vane propeller propeller gross thrusts are about 12.5kgf；7
Vane propeller propeller gross thrust is about 14.5kgf；9 vane propeller propeller gross thrusts are about 15kgf.Lines are to flow in figure
Body flow direction, it can be seen that when fluid is flowed out through runner rear end, the flow direction of fluid is substantially parallel with the axis of cylinder 10.
In the present invention, term " first ", " second ", " third " are only used for the purpose of description, and should not be understood as indicating
Or imply relative importance；Term " multiple " then refers to two or more, unless otherwise restricted clearly.Term " installation ",
The terms such as " connected ", " connection ", " fixation " shall be understood in a broad sense, for example, " connection " may be a fixed connection, being also possible to can
Dismantling connection, or be integrally connected；" connected " can be directly connected, can also be indirectly connected through an intermediary.For this
For the those of ordinary skill in field, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In description of the invention, it is to be understood that the instructions such as term " on ", "lower", "left", "right", "front", "rear"
Orientation or positional relationship is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of the description present invention and simplification is retouched
It states, rather than the device or unit of indication or suggestion meaning must have specific direction, be constructed and operated in a specific orientation,
It is thus impossible to be interpreted as limitation of the present invention.
In the description of this specification, the description of term " one embodiment ", " some embodiments ", " specific embodiment " etc.
Mean that particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained at least one reality of the invention
It applies in example or example.In the present specification, schematic expression of the above terms are not necessarily referring to identical embodiment or reality
Example.Moreover, description particular features, structures, materials, or characteristics can in any one or more of the embodiments or examples with
Suitable mode combines.
These are only the preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of underwater propulsion unit characterized by comprising
Cylinder；
Cavity cylinder is fixedly arranged in the cylinder, and the lateral wall of the cavity cylinder and the inner wall of the cylinder limit runner；
Driving device is fixedly arranged on the front end of the cavity cylinder；
Blade is driven, is fixedly arranged on the power output shaft of the driving device；
Multiple deflectors are extended to form along the radial of the cavity cylinder to the cylinder from the lateral wall of the cavity cylinder,
The guide vane is located at the rear side of the driving blade,
Wherein, from the front to the back, the first diversion division on front side of the deflector is in the circumferential direction of the cavity cylinder gradually to offset
Direction offset, the offset direction are contrary with the driving blade rotation.
2. underwater propulsion unit according to claim 1, which is characterized in that
First diversion division includes first side and second side, and the first side and second side are in the driving blade
It successively arranges on the direction of rotation, the range of the first side maximum bend angle is 6.8 °~28.1 °.
3. underwater propulsion unit according to claim 2, which is characterized in that
The angular range of the driving blade torsional angle β is 60.9~76.6 °.
4. underwater propulsion unit according to any one of claim 1 to 3, which is characterized in that the deflector further include:
Second diversion division is fixedly arranged on the lateral wall of the cavity cylinder, and second diversion division is correspondingly connected to described first
On rear side of diversion division,
Wherein, second diversion division extends along the axis direction of the cavity cylinder.
5. underwater propulsion unit according to claim 4, which is characterized in that
Second diversion division extends shape to the cylinder along the radial of the cavity cylinder from the lateral wall of the cavity cylinder
At.
6. underwater propulsion unit according to claim 4, which is characterized in that
The deflector is fixedly connected with the inner wall of the cylinder.
7. underwater propulsion unit according to any one of claim 1 to 3, which is characterized in that further include:
Shield is fixedly arranged on front side of the cylinder, and fluid successively flows into the stream through the shield and the driving blade
Road.
8. underwater propulsion unit according to any one of claim 1 to 3, which is characterized in that
The cavity cylinder and the cylinder are coaxially disposed.
9. underwater propulsion unit according to any one of claim 1 to 3, which is characterized in that
The deflector is 3~5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910788144.0A CN110481741A (en) | 2019-08-26 | 2019-08-26 | A kind of underwater propulsion unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910788144.0A CN110481741A (en) | 2019-08-26 | 2019-08-26 | A kind of underwater propulsion unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110481741A true CN110481741A (en) | 2019-11-22 |
Family
ID=68553868
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910788144.0A Withdrawn CN110481741A (en) | 2019-08-26 | 2019-08-26 | A kind of underwater propulsion unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110481741A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111114727A (en) * | 2020-01-16 | 2020-05-08 | 兰州理工大学 | Fluid spiral thrust driven propeller |
| CN111114727B (en) * | 2020-01-16 | 2024-05-10 | 兰州理工大学 | Propeller driven by fluid spiral thrust |
-
2019
- 2019-08-26 CN CN201910788144.0A patent/CN110481741A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111114727A (en) * | 2020-01-16 | 2020-05-08 | 兰州理工大学 | Fluid spiral thrust driven propeller |
| CN111114727B (en) * | 2020-01-16 | 2024-05-10 | 兰州理工大学 | Propeller driven by fluid spiral thrust |
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Application publication date: 20191122 |