CN210416959U - Active coaxial contra-rotating propeller with variable axial spacing - Google Patents
Active coaxial contra-rotating propeller with variable axial spacing Download PDFInfo
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- CN210416959U CN210416959U CN201921179370.0U CN201921179370U CN210416959U CN 210416959 U CN210416959 U CN 210416959U CN 201921179370 U CN201921179370 U CN 201921179370U CN 210416959 U CN210416959 U CN 210416959U
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Abstract
An active coaxial contra-rotating propeller with variable axial spacing comprises a front propeller and a rear propeller, wherein the front propeller and the rear propeller are coaxially arranged, a plurality of front propeller blades are uniformly distributed on a hub of the front propeller, and a plurality of rear propeller blades are uniformly distributed on a hub of the rear propeller; a distance-adjusting hydraulic cylinder is connected between the front propeller hub and the rear propeller hub, and the distance-adjusting hydraulic cylinder is coaxially arranged with the front propeller and the rear propeller; the front propeller hub is fixedly connected to the end part of a piston rod of the distance-adjusting hydraulic cylinder, and the rear propeller hub is fixedly connected to the bottom end of a cylinder barrel of the distance-adjusting hydraulic cylinder; when the aircraft is in a takeoff state, a piston rod of the distance-adjusting hydraulic cylinder is in an extending state, so that the axial distance between the front propeller and the rear propeller is increased; when the aircraft is in a cruising state, a piston rod of the distance-adjusting hydraulic cylinder is in a retracting state, so that the axial distance between the front propeller and the rear propeller is reduced; the number of the front paddle blades and the number of the rear paddle blades are both 2-16; the ratio of the change range of the axial distance between the front paddle and the rear paddle to the rotating diameter of the front paddle blade/the rear paddle blade is 0.01-1000%.
Description
Technical Field
The utility model belongs to the technical field of the air screw, especially, relate to an active coaxial contra-rotating screw who becomes axial interval.
Background
Currently, the airscrew is one of the main power devices of an aircraft, and is widely applied in the fields of transport planes, civil aircraft, general aircraft, unmanned aerial vehicles and the like, while the coaxial contra-rotating airscrew belongs to one type of airscrew.
The coaxial contra-rotating propellers are air propellers consisting of two single-row propellers which rotate around the same rotating shaft and have opposite rotating directions, the upstream single-row propeller is called a front propeller, the downstream single-row propeller is called a rear propeller, the front propeller and the rear propeller can have the same geometric parameters or blade shapes, and the like, and different geometric parameters or blade shapes can be used according to aerodynamic performance requirements.
However, since the rear propeller of the coaxial counter-rotating propellers is completely in the slipstream generated by the front propeller, the aerodynamic performance of the rear propeller is directly affected by the front propeller, and at the same time, if the axial distance between the front and rear propellers is small, the aerodynamic performance of the front propeller is also affected by the rear propeller.
Research shows that the coaxial contra-rotating propeller has higher aerodynamic efficiency compared with an isolated single-row propeller, the axial distance between the front propeller and the rear propeller is one of important parameters influencing the aerodynamic performance of the coaxial contra-rotating propeller, and the aerodynamic performance can also influence other parameters such as thrust, efficiency and the like.
At present, the axial distance of the existing coaxial contra-rotating propellers is fixed and unchanged, so that the existing coaxial contra-rotating propellers only have the best performance in a single flight state, but cannot be matched with the best aerodynamic performance according to the flight state.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems in the prior art, the utility model provides an active coaxial contra-rotating propeller with variable axial spacing, which can actively change the axial spacing between the front propeller and the rear propeller according to the states of takeoff, cruise and the like; when the aircraft takes off, the propeller is in a state of maximum thrust, and the axial distance between the front propeller and the rear propeller can be actively adjusted to be larger, so that the thrust of the propeller is further increased, and the takeoff of the aircraft is facilitated; when the aircraft is cruising, the thrust of the propeller is reduced, the axial distance between the front propeller and the rear propeller can be actively adjusted and reduced, so that the pneumatic efficiency of the propeller is higher, and the flight economy is improved.
In order to achieve the above purpose, the utility model adopts the following technical scheme: an active coaxial contra-rotating propeller with variable axial spacing comprises a front propeller and a rear propeller, wherein the front propeller and the rear propeller are coaxially arranged, a plurality of front propeller blades are uniformly distributed on a hub of the front propeller, and a plurality of rear propeller blades are uniformly distributed on a hub of the rear propeller; a distance-adjusting hydraulic cylinder is connected between the front propeller hub and the rear propeller hub, and the distance-adjusting hydraulic cylinder is coaxially arranged with the front propeller and the rear propeller; the front propeller hub is fixedly connected to the end of a piston rod of the distance-adjusting hydraulic cylinder, and the rear propeller hub is fixedly connected to the bottom end of a cylinder barrel of the distance-adjusting hydraulic cylinder.
When the aircraft is in a takeoff state, a piston rod of the distance-adjusting hydraulic cylinder is in an extending state, so that the axial distance between the front propeller and the rear propeller is increased.
When the aircraft is in a cruising state, a piston rod of the distance-adjusting hydraulic cylinder is in a retracting state, so that the axial distance between the front propeller and the rear propeller is reduced.
The number of the front paddle blades and the number of the rear paddle blades are both 2-16.
The ratio of the axial distance change range of the front paddle and the rear paddle to the rotating diameter of the front paddle blade/the rear paddle blade is 0.01-1000%.
The utility model has the advantages that:
the active coaxial contra-rotating propeller with variable axial spacing can actively change the axial spacing between the front propeller and the rear propeller according to the states of takeoff, cruising and the like; when the aircraft takes off, the propeller is in a state of maximum thrust, and the axial distance between the front propeller and the rear propeller can be actively adjusted to be larger, so that the thrust of the propeller is further increased, and the takeoff of the aircraft is facilitated; when the aircraft is cruising, the thrust of the propeller is reduced, the axial distance between the front propeller and the rear propeller can be actively adjusted and reduced, so that the pneumatic efficiency of the propeller is higher, and the flight economy is improved.
Drawings
Fig. 1 is a perspective view of an active variable axial spacing coaxial contra-rotating propeller of the present invention;
fig. 2 is a side view of an active variable axial spacing coaxial contra-rotating propeller of the present invention;
in the figure, 1 is a front propeller hub, 2 is a front propeller blade, 3 is a rear propeller hub, 4 is a rear propeller blade, and 5 is a distance-adjusting hydraulic cylinder.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 and 2, an active coaxial counter-rotating propeller with variable axial spacing comprises a front propeller and a rear propeller, wherein the front propeller and the rear propeller are coaxially arranged, a plurality of front propeller blades 2 are uniformly distributed on a front propeller hub 1, and a plurality of rear propeller blades 4 are uniformly distributed on a rear propeller hub 3; a distance-adjusting hydraulic cylinder 5 is connected between the front propeller hub 1 and the rear propeller hub 3, and the distance-adjusting hydraulic cylinder 5 is coaxially arranged with the front propeller and the rear propeller; the front propeller hub 1 is fixedly connected to the end of a piston rod of the distance-adjusting hydraulic cylinder 5, and the rear propeller hub 3 is fixedly connected to the bottom end of a cylinder barrel of the distance-adjusting hydraulic cylinder 5.
When the aircraft is in a takeoff state, a piston rod of the distance-adjusting hydraulic cylinder 5 is in an extending state, so that the axial distance between the front propeller and the rear propeller is increased.
When the aircraft is in a cruising state, the piston rod of the distance-adjusting hydraulic cylinder 5 is in a retracting state, so that the axial distance between the front propeller and the rear propeller is reduced.
The number of the front paddle blades and the number of the rear paddle blades are both 2.
The ratio of the change range of the axial distance between the front paddle and the rear paddle to the rotating diameter of the front paddle blade/the rear paddle blade is 10%.
When the coaxial contra-rotating propeller of the utility model is installed on the aircraft, when the aircraft takes off, the front propeller and the rear propeller are both in the maximum thrust state, the piston rod of the controllable pitch hydraulic cylinder 5 extends outwards at the moment, so that the axial distance between the front propeller and the rear propeller is increased, and the thrust between the front propeller and the rear propeller is further increased along with the increase of the axial distance between the front propeller and the rear propeller, although the starting efficiency of the propeller is reduced at the moment, the takeoff of the aircraft is facilitated; and when the aircraft is cruising, the thrust of preceding oar and back oar can reduce, then the piston rod of control roll adjustment pneumatic cylinder 5 inwards retracts to make the axial interval of preceding oar and back oar reduce, the pneumatic efficiency of screw is higher this moment, and then can improve flight economy.
The embodiments are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the scope of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. An active coaxial contra-rotating propeller with variable axial spacing is characterized in that: the propeller comprises a front propeller and a rear propeller, wherein the front propeller and the rear propeller are coaxially arranged, a plurality of front propeller blades are uniformly distributed on a front propeller hub, and a plurality of rear propeller blades are uniformly distributed on a rear propeller hub; a distance-adjusting hydraulic cylinder is connected between the front propeller hub and the rear propeller hub, and the distance-adjusting hydraulic cylinder is coaxially arranged with the front propeller and the rear propeller; the front propeller hub is fixedly connected to the end of a piston rod of the distance-adjusting hydraulic cylinder, and the rear propeller hub is fixedly connected to the bottom end of a cylinder barrel of the distance-adjusting hydraulic cylinder.
2. An active variable axial spacing coaxial contra-rotating propeller as claimed in claim 1, wherein: when the aircraft is in a takeoff state, a piston rod of the distance-adjusting hydraulic cylinder is in an extending state, so that the axial distance between the front propeller and the rear propeller is increased.
3. An active variable axial spacing coaxial contra-rotating propeller as claimed in claim 1, wherein: when the aircraft is in a cruising state, a piston rod of the distance-adjusting hydraulic cylinder is in a retracting state, so that the axial distance between the front propeller and the rear propeller is reduced.
4. An active variable axial spacing coaxial contra-rotating propeller as claimed in claim 1, wherein: the number of the front paddle blades and the number of the rear paddle blades are both 2-16.
5. An active variable axial spacing coaxial contra-rotating propeller as claimed in claim 1, wherein: the ratio of the axial distance change range of the front paddle and the rear paddle to the rotating diameter of the front paddle blade/the rear paddle blade is 0.01-1000%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921179370.0U CN210416959U (en) | 2019-07-25 | 2019-07-25 | Active coaxial contra-rotating propeller with variable axial spacing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921179370.0U CN210416959U (en) | 2019-07-25 | 2019-07-25 | Active coaxial contra-rotating propeller with variable axial spacing |
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| Publication Number | Publication Date |
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| CN210416959U true CN210416959U (en) | 2020-04-28 |
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| CN201921179370.0U Active CN210416959U (en) | 2019-07-25 | 2019-07-25 | Active coaxial contra-rotating propeller with variable axial spacing |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110406661A (en) * | 2019-07-25 | 2019-11-05 | 沈阳航空航天大学 | A kind of coaxial co-axial contra rotating propeller of active variable axial spacing |
| CN112429205A (en) * | 2020-11-20 | 2021-03-02 | 惠阳航空螺旋桨有限责任公司 | Front and rear paddle connecting device |
-
2019
- 2019-07-25 CN CN201921179370.0U patent/CN210416959U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110406661A (en) * | 2019-07-25 | 2019-11-05 | 沈阳航空航天大学 | A kind of coaxial co-axial contra rotating propeller of active variable axial spacing |
| CN112429205A (en) * | 2020-11-20 | 2021-03-02 | 惠阳航空螺旋桨有限责任公司 | Front and rear paddle connecting device |
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