Propeller blowing experiment model with adjustable blades

Abstract

The invention relates to the technical field of propeller structure design, in particular to a propeller blowing experiment model with adjustable blades, which comprises a propeller hub provided with an axially penetrating mounting cavity, and a variable pitch sliding block is slidably arranged in the mounting cavity; an adjustable paddle assembly; and adjusting the driving assembly and the propeller cap. The variable-pitch sliding block driven by the variable-pitch screw is in linkage fit with the paddle eccentric pin arranged at the root of the paddle, so that the paddle can be driven by the variable-pitch sliding block to adjust the angle in the direction perpendicular to the axis of the paddle; and a first bevel gear arranged at the variable-pitch sliding block is matched with a second bevel gear arranged on an eccentric pin of the paddle, so that the angle of the paddle around the spanwise axis of the paddle can be adjusted, and the two-degree-of-freedom cooperative adjustment of axial rotation and radial sliding of the paddle is realized.

Description

Technical Field

[0001] This application relates to the field of propeller structure design technology, and in particular to a propeller blowing experimental model with adjustable blades. Background Technology

[0002] During the development of propellers, their aerodynamic performance needs to be verified through wind tunnel testing. This involves designing a wind tunnel model of the propeller at a certain scale and conducting wind tunnel tests. Existing wind tunnel simulation tests often focus on simulating and measuring the variable pitch motion of the blades around their spanwise axis, lacking adjustable testing of propeller blades in other directions. The experimental models used also lack corresponding adjustment methods. For example, when studying the influence of different preset cone angles on the aeroelastic stability (flutter boundary) of the propeller or comparing the performance differences of different sweep angle design schemes during operation, it is necessary to adjust the blades along directions other than the axis. However, the wind tunnel experimental models used in the current technology often lack corresponding adjustment structures, making the adjustment methods cumbersome and difficult to respond in a timely manner.

[0003] Therefore, there is an urgent need to develop a propeller blowing experimental model that is simple to operate, responds quickly, and is highly adaptable. Summary of the Invention

[0004] This application provides a propeller blowing experiment model with adjustable blades to solve the problem that the existing technology has a relatively cumbersome adjustment method and is difficult to respond in a timely manner due to the lack of a corresponding adjustment structure.

[0005] This application provides a propeller blowing experiment model with adjustable blades, including:

[0006] The propeller hub has an axially penetrating mounting cavity, one end of which is provided with a flange connected to the engine, and a variable pitch slider is slidably arranged inside the mounting cavity.

[0007] An adjustable blade assembly includes a plurality of blades evenly distributed along the circumference of the blade hub, and each blade has an eccentric pin at its root that is connected to the pitch slider.

[0008] The adjustment drive assembly includes a pitch screw that is threadedly engaged with the pitch slider. The pitch screw is rotatably disposed inside the mounting cavity, and both ends of the pitch screw extend to the other side of the mounting cavity.

[0009] The propeller cap is fixed to the front end of the propeller hub with bolts to encapsulate the propeller hub.

[0010] Preferably, the pitch slider is sleeved on the outer surface of the pitch screw, and the pitch slider includes a guide section extending axially and an adjustment section extending radially.

[0011] Preferably, the guide section of the pitch slider is threadedly connected to the outer surface of the pitch screw, and the adjustment section of the pitch slider is provided with a sliding groove that matches the eccentric pin of the blade.

[0012] Preferably, the two ends of the variable pitch slider are provided with serrations or grooves, and the two ends of the variable pitch screw are provided with serrations or protrusions that match the variable pitch slider.

[0013] Preferably, when the variable pitch slider moves to the travel limit at either end, the variable pitch slider can interlock with the serrations / protrusions provided at the end of the variable pitch screw.

[0014] Preferably, the variable pitch slider is provided with a first bevel gear at each end.

[0015] Preferably, a second bevel gear is fixedly provided on one side of the eccentric pin of the blade.

[0016] Preferably, the second bevel gear can mesh with a corresponding first bevel gear when the pitch slider and the end of the pitch screw are interlocked.

[0017] Preferably, one end of the variable pitch screw is provided with a torsion member.

[0018] Preferably, the sidewall of the propeller cap has a through hole aligned with the axis of the propeller blade.

[0019] The beneficial effects of this application are as follows:

[0020] The adjustable propeller blowing experimental model of this application, by setting a variable pitch slider that can be driven by a variable pitch screw and the linkage between the variable pitch slider and the eccentric pin of the propeller at the root of the propeller, allows the propeller to adjust the angle in the direction perpendicular to its axis under the action of the variable pitch slider. Furthermore, by the mutual cooperation between the first bevel gear set at the variable pitch slider and the second bevel gear set at the eccentric pin of the propeller, the angle of the propeller around its spanwise axis can be adjusted, realizing the coordinated adjustment of the axial rotation and radial sliding of the propeller.

[0021] Furthermore, by utilizing the self-locking property of the threaded drive, the adjusted angle and position can be stably maintained after adjustment. The variable pitch screw and variable pitch slider are based on a clear principle, have a compact structure, are easy to operate, and are also easy to manufacture and assemble, effectively improving the overall adjustment efficiency. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the structure of the wind-blowing experimental model with adjustable blades provided in the embodiments of this application;

[0024] Figure 2 This is a schematic diagram of the overall structure of one embodiment of the experimental model provided in this application.

[0025] Figure 3 A schematic diagram of the overall structure of another implementation of the experimental model provided in this application.

[0026] Figure label:

[0027] 1. Blade; 11. Blade body; 12. Blade shaft; 13. Blade root; 2. Blade hub; 21. Mounting cavity; 3. Pitch slider; 31. Sliding groove; 32. First retaining ring; 33. First bevel gear; 4. Pitch screw; 41. Second retaining ring; 5. Blade cap; 6. Blade eccentric pin; 61. Second bevel gear; 7. Torsion component. Detailed Implementation

[0028] The technical solutions of this application will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] The following is combined with Figures 1-3 This describes the wind-blowing experimental model of the adjustable propeller provided in the embodiments of this application.

[0030] Reference Figure 1As shown, the adjustable propeller blowing test model provided in this application embodiment includes a hub 2 with an axially penetrating mounting cavity 21, an adjustable blade 1 assembly including multiple blades 1 evenly distributed around the hub 2, an adjustment drive assembly for adjusting the angle of the blades 1, and a propeller cap 5 fixed to the front end of the hub 2 by bolts for encapsulating the hub 2. One end of the mounting cavity 21 is provided with a flange connected to the engine, and a pitch slider 3 is slidably arranged inside the mounting cavity 21. Each blade 1 has a blade eccentric pin 6 connected to the pitch slider 3 at its root. The adjustment drive assembly includes a pitch screw 4 threadedly engaged with the pitch slider 3. The pitch screw 4 is rotatably arranged inside the mounting cavity 21, and both ends of the pitch screw 4 penetrate to the other side of the mounting cavity 21.

[0031] The blade 1 is composed of three parts: blade body 11, blade shaft 12, and blade root 13. The blade shaft 12 is rotatably mounted inside the blade hub 2. The blade body 11 and blade root 13 are located at the two ends of the blade shaft 12, and the blade root 13 is located at the end of the blade shaft 12 inside the blade hub 2. The blade eccentric pin 6 is fixedly mounted at the blade root 13 of the blade 1. The diameter of the blade 1 at the blade root 13 is larger than the diameter of the blade shaft 12 to prevent the blade 1 from detaching from the blade hub 2 due to centrifugal force during the test.

[0032] By setting up a variable pitch slider 3 that can be driven by a variable pitch screw 4 and a blade eccentric pin 6 located at the root of the blade 1, the blade 1 can adjust its angle perpendicular to its axis under the drive of the variable pitch slider 3. Furthermore, through the mutual cooperation between the first bevel gear 33 located at the variable pitch slider 3 and the second bevel gear 61 located at the blade eccentric pin 6, the blade 1 can adjust its angle around its spanwise axis, thus achieving coordinated adjustment of the blade 1's axial rotation and radial sliding.

[0033] Meanwhile, by utilizing the self-locking property of the threaded drive, the adjusted angle and position can be stably maintained after adjustment. The variable pitch screw 4 and variable pitch slider 3 are based on a clear principle, have a compact structure, are easy to operate, and are also easy to manufacture and assemble, effectively improving the overall adjustment efficiency.

[0034] In some specific embodiments, the pitch slider 3 is sleeved on the outer surface of the pitch screw 4, and the pitch slider 3 includes a guide section extending axially and an adjustment section extending radially.

[0035] The outer surface of the variable pitch screw 4 is provided with a corresponding threaded section, and the inner surface of the variable pitch slider 3 is provided with an internal thread that matches the variable pitch screw 4. A limiting ring is also provided on the variable pitch screw 4 near the inner wall of the mounting cavity 21 to prevent it from coming out.

[0036] In some specific embodiments, the guide section of the variable pitch slider 3 is threadedly connected to the outer surface of the variable pitch screw 4, and the adjustment section of the variable pitch slider 3 is provided with a sliding groove 31 that matches the blade eccentric pin 6. The root end of the blade 1 passes through the blade hub 2 and is connected to the variable pitch slider 3 located inside the mounting cavity 21 through the blade eccentric pin 6. Thus, when the variable pitch slider 3, which is sleeved on the outer surface of the variable pitch screw 4, moves along the axial direction of the variable pitch screw 4, the root end of the corresponding blade 1 can be driven by the blade eccentric pin 6 to move along the axial direction of the variable pitch screw 4 with the variable pitch slider 3, thereby adjusting the angle of the blade 1 in the direction perpendicular to its axis.

[0037] Please continue reading. Figure 2 ,like Figure 2 As shown, it is a schematic diagram of the overall structure of one embodiment of the experimental model provided in this application.

[0038] In some specific embodiments, the two ends of the variable pitch slider 3 are provided with serrations or grooves, and the two ends of the variable pitch screw 4 are provided with serrations or protrusions that match the variable pitch slider 3.

[0039] In some specific embodiments, when the variable pitch slider 3 moves to the travel limit at either end, the variable pitch slider 3 can interlock with the serrations / protrusions provided at the end of the variable pitch screw 4.

[0040] Specifically, a first locking ring 32 is fixedly provided at both ends of the variable pitch slider 3. The outer surface of the first locking ring 32 away from the end of the variable pitch slider 3 is provided with a serrated structure or a groove structure for locking. At the corresponding positions of the two ends of the variable pitch screw 4 located inside the mounting cavity 21, a corresponding second locking ring 41 is provided. The outer surface of the second locking ring 41 near the end of the variable pitch slider 3 is provided with a serrated structure or a protrusion structure that matches the serration or groove on the surface of the first locking ring 32. When the variable pitch slider 3 moves to either end of the variable pitch screw 4, the two can be engaged and locked through the corresponding serration / groove, so that the variable pitch slider 3 can rotate together with the variable pitch screw 4.

[0041] In some specific embodiments, the variable pitch slider 3 is provided with a first bevel gear 33 at both ends.

[0042] In some specific embodiments, a second bevel gear 61 is fixedly provided on one side of the blade eccentric pin 6.

[0043] In some specific embodiments, the second bevel gear 61 can mesh with a corresponding first bevel gear 33 when the pitch slider 3 and the pitch screw 4 are interlocked.

[0044] Specifically, a first bevel gear 33 is fixedly installed at both ends of the variable pitch slider 3. The small end of the first bevel gear 33 is fixedly connected to the outer surface of the variable pitch slider 3 through a connecting block. The first bevel gear 33 is arranged around the periphery of the first locking ring 32. A second bevel gear 61 is fixedly installed at one end of the blade eccentric pin 6 near the variable pitch slider 3. The second bevel gear 61 can mesh with the first bevel gear 33 when the variable pitch slider 3 moves to either end of the variable pitch screw 4 and locks with the variable pitch screw 4. Thus, while the variable pitch slider 3 rotates with the variable pitch screw 4, the blade 1 can be driven to rotate along its own axis under the meshing of the two bevel gears, thereby changing its angle around its spanwise axis.

[0045] Please continue reading. Figure 3 ,like Figure 3 As shown, it is a schematic diagram of the overall structure of another implementation of the experimental model provided in the embodiments of this application;

[0046] Specifically, as another implementation of this embodiment, the first bevel gear 33 can also be directly set at the corresponding ends of the pitch screw 4 and fixedly connected to the pitch screw 4 through the corresponding connecting rod. The pitch screw 4 directly drives the blade 1 to rotate around its own axis. The first bevel gear 33 still needs to mesh with the second bevel gear 61 set at the blade eccentric pin 6 when the pitch screw 4 and the pitch slider 3 are locked.

[0047] In some specific embodiments, a torsion member 7 is provided at one end of the pitch screw 4.

[0048] One end of the variable pitch screw 4 passes through the outer surface of the mounting cavity 21 and is fixedly connected to the torsion member 7. The other end passes through the mounting cavity 21 and is connected to the corresponding limiting member to limit its axial displacement. Simulators can rotate the torsion member 7 to drive the variable pitch screw 4 to rotate inside the mounting cavity 21.

[0049] In some specific embodiments, the sidewall of the propeller cap 5 has a through hole aligned with the axis of the propeller blade 1 to avoid obstructing the adjustment process of the propeller blade 1.

[0050] The working principle of the adjustable propeller blowing experimental model provided in this application embodiment:

[0051] When it is necessary to adjust the angle of the blade 1 in the direction perpendicular to its axis, the torsion member 7 is rotated to drive the pitch screw 4 to rotate inside the mounting cavity 21. Under the drive of the thread at the guide section and the outer surface of the pitch screw 4, the pitch slider 3 sleeved on the outer surface of the pitch screw 4 is moved along the axis of the pitch screw 4. This causes the root end of the blade 1, which is inserted into the pitch slider 3 through the blade eccentric pin 6, to move along the axis of the pitch screw 4 with the pitch slider 3. Thus, the angle of the blade 1 in the direction perpendicular to its axis is adjusted. The adjustment direction can be controlled by controlling the torsion direction of the pitch screw 4.

[0052] When it is necessary to change the angle of the blade 1 around its spanwise axis, the torsion member 7 is rotated to move the pitch slider 3 to the travel limit of either end of the pitch screw 4, so that the pitch slider 3 and the pitch screw 4 are interlocked under the corresponding sawtooth / groove structure. This allows the pitch slider 3 to rotate synchronously with the pitch screw 4. Then, the torsion member 7 is used again to rotate the pitch screw 4. At this time, the second bevel gear 61 located at the blade eccentric pin 6 and the first bevel gear 33 located at the pitch slider 3 are in a meshing state. In this state, the variable pitch slider 3, which rotates with the variable pitch screw 4, drives the second bevel gear 61, which meshes with it, to rotate through the first bevel gear 33. This, in turn, drives the blade 1 to rotate along its own axis. After it rotates to the corresponding angle, the second bevel gear 61 can be disengaged from the corresponding first bevel gear 33 by reversing the variable pitch screw 4. By continuing to twist the variable pitch screw 4 until the variable pitch slider 3 moves to the corresponding position, the adjustment of the blade 1 in the direction perpendicular to its axis is completed, and the adjustment is finished, thus completing the angle adjustment of the blade 1 around its spanwise axis.

[0053] In the description of this application, it should 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", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0054] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0055] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0056] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0057] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A propeller-driven wind-blowing experimental model with adjustable blades, characterized in that, include: The propeller hub has an axially penetrating mounting cavity, one end of which is provided with a flange connected to the engine, and a variable pitch slider is slidably arranged inside the mounting cavity. An adjustable blade assembly includes a plurality of blades evenly distributed along the circumference of the blade hub, and each blade has an eccentric pin at its root that is connected to the pitch slider. The adjustment drive assembly includes a pitch screw that is threadedly engaged with the pitch slider. The pitch screw is rotatably disposed inside the mounting cavity, and both ends of the pitch screw extend to the other side of the mounting cavity. The propeller cap is fixed to the front end of the propeller hub with bolts to encapsulate the propeller hub.

2. The wind-blowing experimental model with adjustable blades according to claim 1, characterized in that, The variable pitch slider is sleeved on the outer surface of the variable pitch screw, and the variable pitch slider includes a guide section extending axially and an adjustment section extending radially.

3. The wind-blowing experimental model with adjustable blades according to claim 2, characterized in that, The guide section of the variable pitch slider is threadedly connected to the outer surface of the variable pitch screw, and the adjustment section of the variable pitch slider is provided with a sliding groove that matches the eccentric pin of the blade.

4. The propeller-driven wind-blowing experimental model with adjustable blades according to claim 3, characterized in that, The variable pitch slider has serrations or grooves at both ends, and the variable pitch screw has serrations or protrusions at both ends that match the variable pitch slider.

5. The wind-blowing experimental model with adjustable blades according to claim 4, characterized in that, When the variable pitch slider moves to the travel limit at either end, the variable pitch slider can interlock with the sawtooth / protrusion provided at the end of the variable pitch screw.

6. The wind-blowing experimental model with adjustable blades according to claim 5, characterized in that, The variable pitch slider is provided with a first bevel gear at each end.

7. The wind-blowing experimental model with adjustable blades according to claim 6, characterized in that, A second bevel gear is fixedly installed on one side of the eccentric pin of the blade.

8. The wind-blowing experimental model with adjustable blades according to claim 7, characterized in that, The second bevel gear can mesh with a corresponding first bevel gear when the pitch slider and the end of the pitch screw are interlocked.

9. The wind-blowing experimental model with adjustable blades according to claim 1, characterized in that, One end of the variable pitch screw is provided with a torsion member.

10. The wind-blowing experimental model with adjustable blades according to claim 1, characterized in that, The side wall of the propeller cap has a through hole aligned with the axis of the propeller blade.

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