阅读说明：本技术 推进装置及其可调进口预旋导叶电驱动涵道风扇推进系统 (Propulsion unit and electric drive ducted fan propulsion system with adjustable inlet pre-rotation guide vanes ) 是由 陈方 田沛东 苟华兴 于 2021-09-18 设计创作，主要内容包括：本发明技术方案公开了推进装置及其可调进口预旋导叶电驱动涵道风扇推进系统,包括涵道外廓；安装于所述涵道外廓中的核心支架；安装于所述核心支架中的推进电机和风扇；所述推进电机中还安装有进口预旋导叶系统,通过所述进口预旋导叶系统实现在所述推进电机转速不变的情况下快速调节所述风扇的加工量,而实现灵活调节推力。本发明通过进口预旋导叶的调节,使推进系统适应从低速到高速的多种不同工况,满足eVTOL不同飞行模式下的推力需求,提高eVTOL巡航速度和巡航效率。同时,通过调节进口预旋导叶偏角,推进系统的推力可以灵活调节,不必等待电机转速改变,从而提高eVTOL垂直起降过程的控制效率,简化控制器设计,提高稳定性。(The technical scheme of the invention discloses a propulsion device and an electrically-driven ducted fan propulsion system with an adjustable inlet pre-rotation guide vane, which comprises a ducted outline; a core support mounted in the ducted profile; a propulsion motor and fan mounted in the core frame; still install import pre-rotation guide vane system among the propulsion motor, through import pre-rotation guide vane system realizes under the unchangeable circumstances of propulsion motor rotational speed quick adjustment the processingquantity of fan, and realize nimble regulation thrust. According to the invention, through the adjustment of the inlet pre-rotation guide vane, the propulsion system is suitable for various different working conditions from low speed to high speed, the thrust requirements of the eVTOL in different flight modes are met, and the eVTOL cruising speed and cruising efficiency are improved. Meanwhile, the thrust of the propulsion system can be flexibly adjusted by adjusting the deflection angle of the inlet pre-rotation guide vane without waiting for the change of the rotating speed of the motor, so that the control efficiency of the eVTOL vertical take-off and landing process is improved, the design of a controller is simplified, and the stability is improved.)

1. An electrically driven ducted fan propulsion system with adjustable inlet pre-swirl vanes, comprising:

a duct profile;

a core support mounted in the ducted profile;

a propulsion motor and fan mounted in the core frame; wherein

The front end of the propulsion motor is also provided with an inlet pre-rotation guide vane system, and the inlet pre-rotation guide vane system is used for rapidly adjusting the machining amount of the fan under the condition that the rotating speed of the propulsion motor is not changed, so that the thrust can be flexibly adjusted.

2. The electrically driven ducted fan propulsion system with adjustable inlet pre-swirl vanes according to claim 1, characterized in that the inlet pre-swirl vane system comprises a fairing cone, a servo motor, a gear disc, vanes and a bracket; the servo motor is fixed in the rectification nose cone, servo motor's output shaft the gear disc, the support with the rectification nose cone is fixed and will the gear disc covers, the stator passes to link up to be located mounting hole on the rectification nose cone with the gear disc is connected.

3. The electrically driven ducted fan propulsion system according to claim 2, wherein the gear disc is a bevel gear, the guide vane comprises a blade, a shaft and a connector, the connector is a bevel gear, the guide vane is mounted in mesh with the gear disc through the connector, and the servo motor controls the gear disc to rotate to adjust the deflection of the guide vane.

4. The system of claim 2, wherein the propulsion motor comprises a stator and a rotor, the stator having a fixed bracket structure formed at a rear end and a front end mounted to the bracket; the front end of the rotor forms an output shaft structure, and the output shaft structure is connected with the fan.

5. The system as claimed in claim 4, wherein the core support comprises an outer casing, a central cylinder, support arms and outlet guide vanes, the inner wall of the outer casing is connected to the front end of the central cylinder through a plurality of uniformly distributed outlet guide vanes, the rear end of the central cylinder is connected to the inner wall of the outer casing through two support arms, the front section of the outer casing is horn-shaped and the rear section is straight, and the tail end fixing support structure of the stator is fixed in the central cylinder.

6. The adjustable inlet pre-swirl vane electrically driven ducted fan propulsion system according to claim 5, wherein the fan comprises a fan blade disc, fan blades evenly circumferentially distributed on the fan blade disc, a coupling for structural connection with the output shaft of the rotor, and a bearing bracket mounted with the central cylinder by a propulsion bearing.

7. The adjustable inlet pre-swirl vane electrically driven ducted fan propulsion system in accordance with claim 5, wherein the ducted profile comprises an outer cowl, a mounting frame on an inner wall of the outer cowl for mounting the core support, and a connector on an outer wall of the outer cowl, the connector being connected down to the support arm.

8. A propulsion device comprising an adjustable inlet pre-swirl vane electrically driven ducted fan propulsion system according to any of claims 1-7.

Technical Field

The invention relates to the technical field of aviation propulsion devices, in particular to a propulsion device and an electric drive ducted fan propulsion system with an adjustable inlet pre-rotation guide vane.

Background

An electric vertical take-off and landing aircraft (eVTOL) is a new concept aircraft that has evolved under the current new energy technology revolution, using electric power to hover, take-off and land vertically. The advent and development of eVTOL has benefited from significant advances in electric only power system technology (motors, batteries, electronic controllers). Most of the eVTOL designs adopt a tiltable power system and have two propulsion modes of upward propulsion and forward propulsion, so that after vertical takeoff, the propulsion direction of the propulsion system is changed, cruise is realized in a fixed wing mode, and higher cruise speed and longer range are obtained.

The electric propulsion devices currently used by eVTOL are mainly electrically driven propellers and electrically driven ducted fans, which have two major disadvantages:

the method is only suitable for a low-speed flight state, cannot generate thrust required by an aircraft when the flight speed is high, and limits the development of the eVTOL with the Mach number of more than 0.5;

the thrust is adjusted by controlling the rotating speed of the motor, and the adjusting mode has higher sensitivity for small-sized rotors or ducted fans. In a larger rotor or ducted fan propulsion device, because the rotational inertia of the rotor is large, the speed regulation is slow, if the thrust regulation is still carried out by adopting a mode of controlling the rotating speed of the motor, the thrust regulation lag can be caused, the stability control of the eVTOL is not facilitated, and the flight safety is directly influenced. Therefore, the eVTOL usually adopts an array of small-sized rotors or ducted fans to obtain the required thrust, but the large reduction of hovering efficiency and the increase of cruise resistance greatly limit the size and weight of the eVTOL.

Disclosure of Invention

The invention provides an electrically-driven ducted fan propulsion system with an adjustable inlet pre-rotation guide vane, which can effectively generate thrust under the working conditions of low speed and high speed, and the thrust can be quickly adjusted, so that the cruising speed and the stability of an eVTOL (electric variable volume) are improved.

In order to solve the above technical problem, the present invention provides an electrically driven ducted fan propulsion system with adjustable inlet pre-rotation guide vanes, wherein the system comprises:

a duct profile;

a core support mounted in the ducted profile;

a propulsion motor and fan mounted in the core frame; wherein

The front end of the propulsion motor is also provided with an inlet pre-rotation guide vane system, and the inlet pre-rotation guide vane system is used for rapidly adjusting the machining amount of the fan under the condition that the rotating speed of the propulsion motor is not changed, so that the thrust can be flexibly adjusted.

Optionally, the inlet pre-rotation guide vane system comprises a rectifying nose cone, a servo motor, a gear disc, guide vanes and a bracket; the servo motor is fixed in the rectification nose cone, servo motor's output shaft the gear disc, the support with the rectification nose cone is fixed and will the gear disc covers, the stator passes to link up to be located mounting hole on the rectification nose cone with the gear disc is connected.

Optionally, the toothed disc is the bevel gear, the stator includes blade, axis body and connector, the connector is the bevel gear, the stator passes through the connector with the toothed disc meshing installation, servo motor control the toothed disc rotates and is right the stator deflects the regulation.

Optionally, the propulsion motor comprises a stator and a rotor, a fixed support structure is formed at the tail end of the stator, and the front end of the stator is mounted with the support; the front end of the rotor forms an output shaft structure, and the output shaft structure is connected with the fan.

Optionally, the core support includes outer machine casket, a central section of thick bamboo, support arm and export stator, outer machine casket inner wall with a plurality of evenly distributed are passed through to a central section of thick bamboo front end export the stator is connected, the rear end of a central section of thick bamboo with outer machine casket inner wall is through two from top to bottom the support arm is connected, outer machine casket anterior segment is the horn-shaped opening, and the back end is straight tube-shape, the tail end fixed bolster structure of stator is fixed in the central section of thick bamboo.

Optionally, the fan comprises a fan blade disc, fan blades evenly circumferentially distributed on the fan blade disc, a coupling for structural connection with the output shaft of the rotor, and a bearing bracket mounted with the central barrel by a thrust bearing.

Optionally, the ducted profile comprises an outer fairing, a mounting frame located on an inner wall of the outer fairing for mounting the core support and a connector located on an outer wall of the outer fairing, the connector being connected downwardly to the support arm.

In order to solve the technical problem, the invention further provides a propulsion device, wherein the propulsion device comprises the electric-driven ducted fan propulsion system with the adjustable inlet pre-rotation guide vanes.

The technical scheme of the invention has the beneficial effects that:

according to the invention, through the adjustment of the inlet pre-rotation guide vane, the propulsion system is suitable for various different working conditions from low speed to high speed, the thrust requirements of the eVTOL in different flight modes are met, particularly the thrust requirements in a high-speed flight state are met, and the eVTOL cruising speed and cruising efficiency are improved. Meanwhile, the thrust of the propulsion system can be flexibly adjusted by adjusting the deflection angle of the inlet pre-rotation guide vane without waiting for the change of the rotating speed of the motor, so that the control efficiency of the eVTOL vertical take-off and landing process is improved, the design of a controller is simplified, and the stability is improved.

Drawings

FIG. 1 is a schematic structural view of an electrically driven ducted fan propulsion system with adjustable inlet pre-rotation vanes according to the present invention;

FIG. 2 is an exploded view of an electrically driven ducted fan propulsion system with adjustable inlet pre-rotation vanes according to the present invention;

FIG. 3 is a schematic structural view of a core scaffold according to the present invention;

FIG. 4 is a schematic view of a propulsion motor according to the present invention;

FIG. 5 is a schematic structural diagram of a fan according to the present invention;

FIG. 6 is an exploded view of an inlet pre-swirl vane system according to the present invention;

FIG. 7 is a schematic structural view of an inlet pre-swirl vane system of the present invention;

fig. 8 is a schematic structural view of the contour of the duct of the present invention.

The specific implementation mode is as follows:

the invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Referring to fig. 1 and 2, an embodiment of an electrically driven ducted fan propulsion system with adjustable inlet pre-swirl vanes is shown, wherein a ducted profile 5 is included; a core support 1 mounted in the culvert profile 5; a propulsion motor 2 and a fan 3 installed in the core frame 1; wherein the front end of propulsion motor 2 still installs import prewhirl stator system 4, and import prewhirl stator system 4 is located the most upper reaches department of whole device through installing in propulsion motor 2 the place ahead, and the front end of fan 3 realizes the machining volume of quick adjustment fan under the unchangeable circumstances of propulsion motor 2 rotational speed through import prewhirl stator system 4, and realizes nimble regulation thrust.

Optionally, the inlet pre-rotation guide vane system 4 comprises a rectifying nose cone 18, a servo motor 19, a gear disc 20, guide vanes 21 and a bracket 22; the servo motor 19 is fixed in the rectifying nose cone 18, an output shaft of the servo motor 19 is connected with the gear disc 20, the support 22 is fixed with the rectifying nose cone 18 and covers the gear disc 20, and the guide vane 21 penetrates through a mounting hole formed in the rectifying nose cone 18 and is connected with the gear disc 20.

Optionally, the gear disc 20 is a bevel gear, the guide vane 21 comprises a blade 21.a, a shaft body 21.b and a connecting body 21.c, the connecting body 21.c is a bevel gear, the guide vane 21 is mounted in a meshing manner with the gear disc 20 through the connecting body 21.c, and the servo motor 19 controls the gear disc 20 to rotate so as to adjust the deflection of the guide vane 21.

Optionally, the propulsion motor 2 includes a stator 11 and a rotor 12, a fixed bracket structure is formed at the tail end of the stator 11, and the front end is mounted with the bracket 22; the front end of the rotor 12 forms an output shaft 13 structure, and the output shaft 13 structure is connected with the fan 3.

Optionally, the core support 1 includes an outer casing 7, a central cylinder 10, support arms 8 and outlet guide vanes 9, the inner wall of the outer casing 7 is connected to the front end of the central cylinder 10 through a plurality of outlet guide vanes 9 uniformly distributed, the rear end of the central cylinder 10 is connected to the inner wall of the outer casing 7 through an upper support arm and a lower support arm 8, the front section of the outer casing 7 is a horn-shaped opening, the rear section is a straight cylinder, and the tail end fixing support structure of the stator 11 is fixed in the central cylinder 10.

Optionally, the fan 3 comprises a fan blade disc 15, fan blades 14 evenly circumferentially distributed on the fan blade disc 15, a coupling 16 for structural connection with the output shaft 13 of the rotor 12, and a bearing bracket 17 mounted with the central cartridge 10 by the thrust bearing 6.

Optionally, the ducted profile 5 comprises an outer fairing 24, a mounting frame 23 on the inner wall of the outer fairing 24 for mounting the core support 1 and a connector 25 on the outer wall of the outer fairing 24, the connector 25 being connected down to the support arm 8.

The working principle of the invention is as follows: the propulsion motor 2 drives the fan 3 to rotate at high speed. The incoming flow passes through the air inlet lip, is pressurized by a blade system formed by the inlet pre-rotation guide vanes 21, the fan 3 and the outlet guide vanes 9, and then is accelerated to be sprayed out from the ducted spray pipe at a high speed, so that the thrust is generated.

In order to solve the technical problem, the invention further provides a propulsion device, wherein the propulsion device comprises the electric-driven ducted fan propulsion system with the adjustable inlet pre-rotation guide vanes.

The features and functions of the present invention will be further understood from the following description.

As shown in fig. 1 and 2, the present embodiment comprises a core support 1, a propulsion motor 2, a fan 3, an inlet pre-rotation vane system 4, a duct profile 5 and a propulsion bearing 6, etc. Wherein the content of the first and second substances,

as shown in fig. 3, the core frame 1 of the present embodiment includes an outer casing 7, a support arm 8, an outlet guide vane 9, and a center barrel 10. The front section of the outer casing 7 is a horn-shaped opening, and the rear section is in a straight cylinder shape, so that the outer casing plays a role in forming the inner wall of the duct and containing the inner impeller device. The supporting arm 8 is located at the rear end of the outer casing, is cylindrical, has a streamlined section and is hollow inside, two ends of the supporting arm 8 are respectively connected with the outer casing 7 and the central cylinder 10 to play a role in fixing, and the inside of the supporting arm is used as a passage of a wiring harness. The number of the support arms 8 is two and they are located at positions right above and below the core support 1, respectively. The outlet guide vane 9 is located upstream of the support arm 8, one end of which is fixed to the central cylinder 10 and the other end of which is fixed to the outer casing 7, and functions to pressurize and guide the air flow rotating at the outlet of the fan 3. The number of the outlet guide vanes 9 is 12, and the outlet guide vanes are distributed along the axial center of the propulsion system in a central symmetry mode. The central cylinder 10 is used for fixing the propulsion motor 2 and the propulsion bearing 6, the rear end of the central cylinder is a conical fairing, the interior of the central cylinder is hollow, and the foremost end of the central cylinder is a mounting base of the propulsion bearing 6.

As shown in fig. 4, the propulsion motor 2 of the present embodiment is a high-speed brushless dc motor, and includes two parts, namely a stator 11 and a rotor 12. The stator 11 is cylindrical, the rear end of the stator is provided with a fixed support connected with the core support central cylinder 10, and the front end of the stator is provided with a mounting point of an inlet pre-rotation guide vane system support 22. The rotor 12 is hollow cylinder, its inner wall contacts with the stator 11 through the bearing, the front end is the output shaft 13, can bolt with the fan coupling 16.

As shown in fig. 5, the fan 3 of the present embodiment includes fan blades 14 and a fan blade disk 15. The number of the fan blades 14 is 10, and the fan blades are distributed along the axis center of the fan symmetrically. The fan blade disk 15 comprises mortises for fixing the fan blades, a coupling 16 for connecting with the output shaft 13 of the rotor of the propulsion motor 2 and a bearing bracket 17 for connecting with the central cylinder 10 of the core support 1 through the propulsion bearing 6 (as shown in fig. 6). The fan blade disc 15 is hollow and provides space for the installation of the inlet pre-swirl vane system 4.

As shown in fig. 6 and 7, the inlet pre-rotation guide vane system 4 of the present embodiment includes a rectifying nose cone 18, a servo motor 19, a gear disc 20, guide vanes 21, and a bracket 22. The fairing nose cone 18 performs the function of fairing the rear central cylinder 10 and at the same time serves as a structural framework for the inlet pre-swirl guide vane system 4 with guide vane mounting holes distributed centrally symmetrically along the axis of the propulsion system. The servomotor 19 is fixed to the fairing cone 18, and its output shaft coincides with the axis of the propulsion system for driving the gear disc 20. The gear plate 20 is a bevel gear, is fixed on the output shaft of the servo motor 19, and can be engaged with the bevel gear of the guide vane 21 to drive the guide vane 21 to deflect. The guide vane 21 comprises a blade 21.a, a shaft 21.b and a bevel gear 21.c, connected to the fairing cone 18 via the shaft 21.b, freely rotatable. The number of the guide vanes 21 is 12, and the guide vanes are distributed along the axial center of the propulsion system in a central symmetry mode. One end of the bracket 22 is connected with the rear part of the rectifying nose cone 18, and the other end is connected with the stator 11 of the propulsion motor.

As shown in fig. 8, the ducted outer profile 5 of the present embodiment includes a mounting frame 23, an outer cowl 24, and a connector 25. The mounting frame 24 is connected with the core support outer casing 7 and plays a role in structural reinforcement. The lower end of connector 25 is connected to core support arm 8 and the upper end is mountable at the aircraft engine mounting point and is a structural hanger for the entire propulsion system.

The core of the invention is that on the layout of the conventional electric driven ducted fan propulsion device, an adjustable inlet pre-rotation guide vane is added, and the guide vane can simultaneously realize two purposes:

the anti-prerotation of the fan inlet is provided, the airflow deflection angle of the fan is increased, and the work load of the fan is increased. This design essentially shares the load of the outlet guide vanes, which results in an increased load on the entire fan stage and an increased thrust on the propulsion system at high incoming flow speeds.

The deflection angle of the guide blade can be adjusted to quickly adjust the work adding amount of the fan under the condition that the rotating speed of the motor is not changed, so that the thrust can be flexibly adjusted.

In conclusion, the invention enables the propulsion system to adapt to various different working conditions from low speed to high speed by adjusting the inlet pre-rotation guide vanes, meets the thrust requirement of the eVTOL in different flight modes, particularly tells the thrust requirement in the flight state, and improves the cruise speed and the cruise efficiency of the eVTOL. Meanwhile, the thrust of the propulsion system can be flexibly adjusted by adjusting the deflection angle of the inlet pre-rotation guide vane without waiting for the change of the rotating speed of the motor, so that the control efficiency of the eVTOL vertical take-off and landing process is improved, the design of a controller is simplified, and the stability is improved.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.