Device capable of reducing local airflow deposition of wings of tilt rotorcraft
By designing an open-closed hood device on the tilt rotor wing, the airflow siltation problem caused by rotor scrubbing in helicopter mode is solved, the rotor tension loss is reduced, and the economy and performance of the aircraft are improved.
Patent Information
- Application Number
- CN202411610487.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-12
- Publication Date
- 2025-01-10
AI Technical Summary
In helicopter mode, local airflow siltation caused by rotor washing flow impact, resulting in reduced effective rotor tension. The current technology still suffers a large loss of rotor tension when reducing the weight gain effect.
Designing a device includes mounting a cover frame and a cover plate on the wing, enabling 90° opening and closing of the cover hole by connecting the assembly and driving assembly to reduce the impact of airflow silt. The device adopts structures such as slide grooves, sliders, connecting rods and hydraulic push rods to ensure stable movement and efficient opening and closing of the mouth cover plate.
It effectively reduces the impact of vertical weight gain caused by the under-rotor scrubbing airflow, has a simple structure and a small weight of additional mechanisms, which significantly reduces the loss of rotor tension and improves the economy and performance of the aircraft.
Smart Images
Figure CN119284139A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of rotorcraft, and in particular to a rotorcraft wing. Background Art
[0002] Tilt-rotor aircraft have the characteristics of both helicopters and fixed-wing aircraft, with helicopter flight mode and fixed-wing flight mode, and have the advantages of vertical / short-distance takeoff and landing, wide flight envelope, good endurance, strong carrying capacity, low average fuel consumption rate / good economy, etc., and can better adapt to many complex use environments on land and at sea. When the tilt-rotor aircraft takes off and lands in helicopter mode, the rotor wash impacts the wings, fuselage and nacelle, and local airflow accumulates, causing a "weight increase effect" and reducing the effective pull of the rotor.
[0003] The initial solution was to tilt the flaps downward to 75° in helicopter mode, which could effectively reduce the "weight gain effect", but the rotor thrust loss was still around 15%. In order to further compensate for the thrust loss, installing maintenance covers on the wings became an effective way to reduce the "weight gain effect". Summary of the invention
[0004] In view of the deficiencies in the prior art, the present invention provides a device that can reduce local airflow accumulation on the wing of a tilt-rotor aircraft, realizes the opening of a cover on the wing, and realizes 90° opening and closing, thereby reducing tension loss.
[0005] The object of the present invention is achieved by: a device for reducing local airflow accumulation on the wing of a tiltrotor aircraft, comprising: A mouth cover frame is installed on the wing of the tilt-rotor aircraft, and a mouth cover hole is opened on the mouth cover frame; The cover plate is installed on the cover frame to close or open the cover hole; A connecting component connects the cover frame and the cover plate, and drives the cover plate to close or open the cover hole; The driving component is used to drive the connecting component to drive the cover plate to close or open the cover hole.
[0006] Furthermore, a slide groove is provided on the side of the mouth cover frame, a slider is provided in the slide groove, the slider is connected to the mouth cover plate through a first pin shaft, and the mouth cover plate can rotate around the first pin shaft when the slider slides along the slide groove.
[0007] Furthermore, the connecting assembly includes a connecting rod, which is L-shaped as a whole. The end of the short side of the L is hinged on the mouth cover frame, and the end of the long side of the L is hinged to the mouth cover plate. The rotation of the connecting rod drives the mouth cover plate to rotate and slide along the sliding groove with the slider.
[0008] Furthermore, the driving assembly includes a linear actuator, one end of which is hinged to the bottom of the cover frame, and the output shaft of the other end is transmission-connected to the sleeve, the connecting rod is fixed to the outer periphery of the sleeve, and the sleeve drives the connecting rod to rotate.
[0009] Furthermore, a support is provided at the bottom of the cover plate, the sleeve is installed on the support, the output shaft of the linear actuator is connected to a rack, one end of the sleeve is sleeved with a driven gear meshing with the rack, and a slide rail cooperating with the rack is provided below the support.
[0010] Furthermore, a groove is provided on the cover plate to avoid interference with the connecting rod.
[0011] Furthermore, one end of the connecting rod hinged to the cover plate is processed into a bending head, and a through hole is opened on the bending head, a second pin is arranged in the through hole, and the groove includes a first groove and a second groove of different depths, which respectively cooperate with the front and back sides of the connecting rod.
[0012] Compared with the prior art, the beneficial effects of the present invention are that the present invention can reduce the "vertical weight increase" effect caused by the rotor downwash airflow when meeting the take-off and landing requirements of the tilt-rotor aircraft helicopter mode, has a simple and reliable structure, has a small weight of additional attached mechanisms, and is highly economical. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.
[0014] Figure 1 This is a diagram of the closed state of the mouth cover of the present invention.
[0015] Figure 2 This is a diagram of the opening state of the mouth cover of the present invention.
[0016] Figure 3 This is a state diagram of the process from closing to opening of the mouth cover of the present invention.
[0017] Figure 4 It is a schematic diagram of the cover frame structure of the present invention.
[0018] Figure 5 It is a schematic diagram of the structure of the mouth cover plate in the present invention.
[0019] Figure 6 It is a schematic diagram of the structure of the connection component in the present invention.
[0020] Figure 7 It is a schematic diagram of the structure of the driving component in the present invention.
[0021] Figure 8 The present invention is installed in a tilt-rotor aircraft. Figure 1 .
[0022] Fig. 9 The present invention is installed in a tilt-rotor aircraft. Figure 2 .
[0023] Fig.10 The figure is a comparison curve of the weight increase percentage of the tiltrotor aircraft before and after the installation of the present invention.
[0024] Fig.11 The figure shows the changing trend of the pressure coefficient Cp of the tiltrotor aircraft on the wing surface before and after the installation of the present invention.
[0025] Among them, 100 is a cover frame, 101 is a slide groove, 102 is a slider, 103 is a first pin, 104 is a support, 105 is a slide rail, 200 is a cover plate, 201 is a first groove, 202 is a second groove, 300 is a connecting component, 301 is a sleeve, 301a is an inner sleeve, 301b is an outer sleeve, 302 is a connecting rod, 302a is a bending head, 303 is a second pin, 400 is a driving component, 401 is a linear actuator, 401a is a piston rod, 402 is a rack, 403 is a driven gear, 404 is a support shaft, 405 is a hinge seat, 500 is a wing, and 501 is a notch. DETAILED DESCRIPTION
[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0027] like Figure 1-9 A device for reducing local airflow accumulation on a wing of a tiltrotor aircraft is shown, comprising: The mouth cover frame 100 is installed on the wing 500 of the tilt-rotor aircraft, and the mouth cover frame 100 is provided with a mouth cover hole; The mouth cover plate 200 is installed on the mouth cover frame 100 to close or open the mouth cover hole. When opened, the mouth cover plate 200 and the mouth cover frame 100 form an angle of nearly 90°; The connecting component 300 connects the mouth cover frame 100 and the mouth cover plate 200, and drives the mouth cover plate 200 to close or open the mouth cover hole; The driving assembly 400 is used to drive the connecting assembly 300 to drive the mouth cover plate 200 to close or open the mouth cover hole.
[0028] Specifically, as shown in the figure, a pair of notches 501 are provided on the wing 500 of the tiltrotor aircraft, the device is installed at the position of the notches 501, and the cover frame 100 is fixedly installed on the wing 500 body; when working, the driving component 400 drives the connecting component 300 to rotate, and the connecting component 300 drives the cover plate 200 to rotate, so as to realize the opening and closing of the cover hole.
[0029] Furthermore, a slide groove 101 is provided on the side of the mouth cover frame 100 , and a slider 102 is provided in the slide groove 101 . The slider 102 is connected to the mouth cover plate 200 through a first pin shaft 103 . The mouth cover plate 200 can rotate around the first pin shaft 103 when the slider 102 slides along the slide groove 101 .
[0030] Specifically, the slide groove 101 is an inner groove, and the interior of the slide groove 101 is square as a whole. The slider 102 is a square slider 102 that cooperates with it. The first pin shaft 103 is connected to the slider 102 and extends out from the slide groove 101 and is connected to the mouth cover plate 200. The connection position is located on the side of the mouth cover plate 200 near the front end.
[0031] It should be noted that the design of the slide groove 101 in conjunction with the upper slider 102 can help the front end of the mouth cover plate 200 to move stably, and can also rotate while moving forward and backward.
[0032] Furthermore, the connecting assembly 300 includes a connecting rod 302, which is L-shaped as a whole. The end of the short side of the L-shape is hinged to the mouth cover frame 100 through the shaft sleeve 301, and the end of the long side of the L-shape is hinged to the mouth cover plate 200. The rotation of the connecting rod 302 drives the mouth cover plate 200 to rotate while sliding along the slide groove 101 with the slider 102.
[0033] Specifically, the hinged position between the connecting rod 302 and the mouth cover plate 200 is located in the upper middle part of the mouth cover plate 200 .
[0034] It should be noted that, when in action, the driving assembly 400 drives one end of the connecting rod 302 to rotate, driving the other end of the connecting rod 302 to rotate, thereby pushing the mouth cover plate 200 to flip downward. At this time, under the action of the slider 102, the front end of the mouth cover plate 200 moves backward to achieve the folding and opening action; the connecting rod 302 in this device is designed as an L-shaped structure in order to cooperate with the installation position design of the power end hinge point. During the design, the power end hinge point needs to be designed on a movement path that does not affect the opening action of the mouth cover plate 200. Therefore, the hinge point is designed below the mouth cover frame 100. At the same time, the L-shaped structure also facilitates the surface of the connecting rod 302 to be flush with the surface of the mouth cover frame 100 and the mouth cover plate 200 when the mouth cover plate 200 is closed, thereby ensuring the flatness of the entire wing 500 wing surface.
[0035] Furthermore, the driving assembly 400 includes a linear actuator 401, one end of which is hinged to the bottom of the cover frame 100, and the output shaft of the other end is transmission-connected to the sleeve 301, the connecting rod 302 is fixed to the outer periphery of the sleeve 301, and the sleeve 301 drives the connecting rod 302 to rotate.
[0036] Specifically, the linear actuator 401 uses a hydraulic push rod (not limited to this, any actuator that can achieve linear motion is applicable), the tail of the hydraulic push rod is hinged on the hinge seat 405, the hinge seat 405 is fixed to the bottom of the cover frame 100, the piston rod 401a of the hydraulic push rod drives the sleeve 301 to rotate, thereby driving the connecting rod 302 to rotate, so as to realize the opening and closing of the cover plate 200; the sleeve 301 is sleeved on the support shaft 404, the sleeve 301 includes an inner sleeve 301a and an outer sleeve 301b, the inner sleeve 301a is sleeved on the support shaft 404, the outer sleeve 301b is sleeved on the inner sleeve 301a, the connecting rod 302 is fixed to the outer periphery of the outer sleeve 301b, and the length of the inner sleeve 301a is greater than the length of the outer sleeve 301b.
[0037] It should be noted that the hydraulic push rod has a simple structure and can be purchased directly. It is hinged at the bottom of the cover frame 100 with the hinge seat 405, which is more convenient to install. At the same time, the overall space occupied is small. The piston rod 401a of the hydraulic push rod drives the sleeve 301 to rotate through its telescopic action, thereby driving the connecting rod 302 to rotate, so as to realize the opening and closing of the cover plate 200; the transmission method of the piston rod 401a and the sleeve 301 can adopt gears or hinges, as long as the rotation of the sleeve 301 can be realized; the sleeve connecting rod 300 is sleeved on the support shaft, and the sleeve adopts an inner and outer sleeve design to locally strengthen the torque when the cover rotates.
[0038] Furthermore, a support 104 is provided at the bottom of the cover plate 200, and a sleeve 301 is installed on the support 104. The output shaft of the linear actuator 401 is connected to a rack 402. One end of the sleeve 301 is provided with a driven gear 403 meshing with the rack 402. A slide rail 105 cooperating with the rack 402 is provided below the support 104.
[0039] Specifically, the support 104 is a plate-like structure, the inner sleeve 301a and one end of the support shaft 404 are set through the support 104 together, the outer sleeve 301b is fitted on the side of the support 104, the rack 402 is slidably set in the slide rail 105, and is fixedly connected to the piston rod 401a of the hydraulic push rod. The driven gear 403 is driven to rotate by the forward and backward movement of the rack 402. The driven gear 403 is connected to the sleeve 301 through a key. The rotation of the driven gear 403 drives the sleeve 301 to rotate, thereby driving the connecting rod 302 to rotate, thereby realizing the opening and closing of the cover plate 200.
[0040] It should be noted that the design of the support 104 facilitates the installation support of the hinge point of the power end and realizes the transmission of power in a limited space.
[0041] Furthermore, a groove is provided on the mouth cover plate 200 to prevent interference with the connecting rod 302 .
[0042] Specifically, when the mouth cover plate 200 is closed, the connecting rod 302 fits in the groove, and the surface of the mouth cover plate 200 is flush with the surface of the connecting rod 302 .
[0043] It should be noted that the groove is designed in order to ensure the flatness of the surface of the cover plate 200 when it is closed.
[0044] Furthermore, one end of the connecting rod 302 hinged to the mouth cover plate 200 is processed into a bending head 302a, and a through hole is opened on the bending head 302a, in which a second pin shaft 303 is arranged, and the groove includes a first groove 201 and a second groove 202 of different depths, which respectively cooperate with the front and back sides of the connecting rod 302.
[0045] It should be noted that the design of the bending head 302a is to ensure hinged assembly without affecting the surface flatness. The first groove 201 is used to accommodate the connecting rod 302 when the mouth cover plate 200 is closed, and the second groove 202 is used to accommodate the connecting rod 302 when the mouth cover plate 200 is opened, while avoiding interference.
[0046] The performance of the tiltrotor aircraft after installing the present invention is compared in conjunction with specific experiments.
[0047] like Fig.10 As shown, at different rotor total pitches, the weight gain percentage of the wing 500 is compared between when the rotating cover is opened and when the rotating cover is not opened. The dotted line is the weight gain percentage when the rotating cover is not opened, and the solid line is the weight gain percentage when the rotating cover is opened. It can be seen from the accompanying drawings that the weight gain percentage is significantly reduced after the present invention is installed.
[0048] like Fig.11 As shown in FIG. 1 , the variation trend of the pressure coefficient Cp on the surface of the wing 500 along with the length of the wing 500 in the wingspan direction under a certain flight condition of the aircraft, wherein the dotted line is the pressure coefficient curve when the rotating cover is not opened, and the solid line is the pressure coefficient curve when the rotating cover is opened. Therefore, opening covers on the upper and lower wall panels of the wing to form air ducts can effectively reduce the weight-increasing effect of the airflow on the wing surface.
[0049] The above embodiments are only used to help understand the method and core idea of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.
Claims
1. A device for reducing local airflow accumulation on a wing of a tiltrotor aircraft, characterized in that: include: A mouth cover frame (100) is installed on the wing (500) of the tiltrotor aircraft, and a mouth cover hole is formed on the mouth cover frame (100); A cover plate (200) is mounted on the cover frame (100) and is used to close or open the cover hole; A connecting assembly (300) connects the mouth cover frame (100) and the mouth cover plate (200), and drives the mouth cover plate (200) to close or open the mouth cover hole; The driving assembly (400) is used to drive the connecting assembly (300) to drive the mouth cover plate (200) to close or open the mouth cover hole.
2. A device for reducing local airflow accumulation on a wing of a tiltrotor aircraft according to claim 1, characterized in that: A sliding groove (101) is provided on the side of the mouth cover frame (100), a sliding block (102) is provided in the sliding groove (101), the sliding block (102) is connected to the mouth cover plate (200) via a first pin shaft (103), and the mouth cover plate (200) can rotate around the first pin shaft (103) when the sliding block (102) slides along the sliding groove (101).
3. A device for reducing local airflow accumulation on a wing of a tiltrotor aircraft according to claim 2, characterized in that: The connecting assembly (300) comprises a connecting rod (302), the connecting rod (302) being L-shaped as a whole, the end of the short side of the L-shape being hinged on the mouth cover frame (100), and the end of the long side of the L-shape being hinged to the mouth cover plate (200), and the rotation of the connecting rod (302) drives the mouth cover plate (200) to rotate while sliding along the slide groove (101) along with the slider (102).
4. The device for reducing local airflow accumulation on the wing of a tiltrotor aircraft according to claim 3, characterized in that: The driving assembly (400) comprises a linear actuator (401), one end of the linear actuator (401) is hinged to the bottom of the cover frame (100), the output shaft of the other end is drivingly connected to the shaft sleeve (301), the connecting rod (302) is fixed to the outer periphery of the shaft sleeve (301), and the shaft sleeve (301) drives the connecting rod (302) to rotate.
5. A device for reducing local airflow accumulation on a wing of a tiltrotor aircraft according to claim 4, characterized in that: A support (104) is provided at the bottom of the cover plate (200), the shaft sleeve (301) is mounted on the support (104), the output shaft of the linear actuator (401) is connected to a rack (402), one end of the shaft sleeve (301) is sleeved with a driven gear (403) meshing with the rack (402), and a slide rail (105) cooperating with the rack (402) is provided below the support (104).
6. The device for reducing local airflow accumulation on the wing of a tiltrotor aircraft according to claim 3, characterized in that: The cover plate (200) is provided with a groove to prevent interference with the connecting rod (302).
7. A device for reducing local airflow accumulation on a wing of a tiltrotor aircraft according to claim 6, characterized in that: One end of the connecting rod (302) hinged to the mouth cover plate (200) is processed into a bending head (302a), and a through hole is provided on the bending head (302a), and a second pin shaft (303) is arranged in the through hole. The groove comprises a first groove (201) and a second groove (202) of different depths, which respectively cooperate with the front and back sides of the connecting rod (302).