Propeller structure convenient for adjusting blade angle in wind tunnel test

Abstract

The invention discloses a propeller structure convenient for adjusting blade angles in a wind tunnel test, a plurality of blades are distributed at intervals along the circumferential direction of a lower propeller shell, the root of each blade is sleeved with an open type friction ring, and the two ends of the opening of each open type friction ring are connected to the lower propeller shell through adjusting screws; the upper paddle shell is buckled and detachably connected to the lower paddle shell, the root of each paddle is limited between the upper paddle shell and the lower paddle shell, and debugging through holes are formed in the positions, corresponding to the adjusting screws one to one, of the upper paddle shell in a penetrating mode. The upper paddle shell is located between the lower paddle shell and the paddle cap, and meanwhile the paddle cap is buckled and detachably connected with the end, away from the lower paddle shell, of the upper paddle shell. The invention discloses a propeller structure convenient for adjusting a blade angle in a wind tunnel test, which is convenient for adjusting the blade angle so as to save time and cost.

Description

Technical Field

[0001] The present invention relates to the technical field of propeller wind tunnel tests, and more specifically, to a propeller structure for facilitating the adjustment of blade angles in wind tunnel tests. Background Art

[0002] For the design of aircraft, since wind tunnel tests can help designers understand the aerodynamic performance of the propellers of aircraft under various conditions and provide important data support for the final design of aircraft, propeller wind tunnel tests are indispensable.

[0003] During the process of conducting propeller wind tunnel tests, when conducting wind tunnel tests on the external shape performance of propeller blades, it is necessary to change different blade angles during the test.

[0004] Currently, the structure of the propeller is as follows: the root of its blade is clamped between the upper propeller housing and the lower propeller housing, and the upper propeller housing and the lower propeller housing are connected by a plurality of fasteners to lock the blade at this angle. At the same time, when the upper propeller housing and the lower propeller housing are fitted and connected, the through hole located at the center of the upper propeller housing and the through hole located at the center of the lower propeller housing will be concentrically docked to form a complete installation through hole. During the wind tunnel test, the output shaft of the wind tunnel motor needs to be clamped in this installation through hole to connect the propeller to the output shaft of the wind tunnel motor, so that the propeller can be driven by the wind tunnel motor to rotate for the wind tunnel test.

[0005] However, since the root of the current propeller blade is clamped between the upper propeller housing and the lower propeller housing through a tight connection between the upper propeller housing and the lower propeller housing, during the wind tunnel test, whenever it is necessary to adjust the angle of the blade, it is necessary to first remove the connected upper propeller housing and the lower propeller housing from the output shaft of the wind tunnel motor, and then remove the upper propeller housing from the lower propeller housing to adjust the installation angle of the blade, and then reconnect the upper propeller housing to the lower propeller housing to lock the blade at this angle.

[0006] However, since it is necessary to first remove the connected upper propeller housing and the lower propeller housing from the output shaft of the wind tunnel motor before each adjustment of the blade angle, the operation process of adjusting the blade angle each time is relatively cumbersome, thus consuming a large amount of time cost.

[0007] Therefore, how to provide a propeller structure for facilitating the adjustment of blade angles in wind tunnel tests is a technical problem that those skilled in the art urgently need to solve. Summary of the Invention

[0008] In view of this, the present invention provides a propeller structure for facilitating the adjustment of blade angles in wind tunnel tests, which is convenient for adjusting the blade angles, thereby saving time cost.

[0009] To achieve the above object, the present invention adopts the following technical solutions:

[0010] A propeller structure for facilitating the adjustment of blade angles in a wind tunnel test, comprising:

[0011] A lower propeller housing;

[0012] Blades, a plurality of the blades are spaced along the circumferential direction of the lower propeller housing, and an open friction ring is sleeved on the root of each blade, and both ends of the opening of each open friction ring are connected to the lower propeller housing by adjusting screws;

[0013] An upper propeller housing, the upper propeller housing is buckled and detachably connected to the lower propeller housing, and the root of each blade is limited between the upper propeller housing and the lower propeller housing. At the same time, debugging through holes are penetrated at multiple positions on the upper propeller housing corresponding to the plurality of adjusting screws one by one;

[0014] A propeller cap, the upper propeller housing is located between the lower propeller housing and the propeller cap, and at the same time, the propeller cap is buckled and detachably connected to one end of the upper propeller housing away from the lower propeller housing.

[0015] By adopting the above technical solutions in this application, the following technical effects can be achieved: When it is necessary to adjust the blade angle during the wind tunnel test, there is no need to disassemble the upper propeller housing from the lower propeller housing, nor to disassemble the lower propeller housing from the output shaft of the wind tunnel motor. Instead, the propeller cap is disassembled from the upper propeller housing to expose the debugging through holes. Thus, tools such as a wrench can be directly inserted into the debugging through holes and act on the corresponding adjusting screws, so that the angle of the blade can be adjusted by loosening the adjusting screws, and the blade can be locked at the current angle by tightening the adjusting screws. And because in the process of adjusting the blade angle in this application, it is not necessary to disassemble the lower propeller housing and the upper propeller housing from the output shaft of the wind tunnel motor, it is convenient to adjust the blade angle, thereby saving time costs.

[0016] Preferably, extension parts are connected to both ends of the opening of each open friction ring, and the two extension parts corresponding to each open friction ring are butted, and mounting through holes are penetrated through the two extension parts corresponding to each open friction ring. The two mounting through holes corresponding to each open friction ring are concentrically butted, and an adjusting screw is inserted into each of the two mounting through holes corresponding to each open friction ring. The tail end of each adjusting screw is threadedly connected to the lower propeller housing, and the head end of each adjusting screw is limited at the outer end of the mounting through hole, so as to fasten the corresponding two extension parts to the lower propeller housing by the adjusting screw.

[0017] The present application adopts the above technical solution, and the following technical effects can be achieved: By connecting extension parts at both ends of the opening of each open friction ring, it is convenient to connect the open friction ring to the lower paddle shell. And when the adjusting screw is loosened, the distance between the two extension parts increases, so that the holding effect of the open friction ring on the paddle blade can be released. And when the adjusting screw is tightened, the distance between the two extension parts decreases, so that the holding effect of the open friction ring on the paddle blade can be achieved to lock the paddle blade at the current angle.

[0018] Preferably, at the top end of the lower paddle shell, a first friction ring limiting groove is provided corresponding to each open friction ring. At the same time, a first extension limiting groove and a first paddle blade root limiting groove are respectively provided near each first friction ring limiting groove at the top end of the lower paddle shell, and each first friction ring limiting groove is connected to the corresponding first extension limiting groove and the corresponding first paddle blade root limiting groove;

[0019] At the bottom end of the upper paddle shell, a second friction ring limiting groove is provided corresponding to each open friction ring. At the same time, a second extension limiting groove and a second paddle blade root limiting groove are respectively provided near each second friction ring limiting groove at the top end of the upper paddle shell, and each second friction ring limiting groove is connected to the corresponding second extension limiting groove and the corresponding second paddle blade root limiting groove. And a debugging through hole penetrates through the bottom of each second extension limiting groove;

[0020] When the upper paddle shell is buckled and connected to the lower paddle shell, the first friction ring limiting groove is docked with the second friction ring limiting groove to limit the open friction ring, and the first paddle blade root limiting groove is docked with the second paddle blade root limiting groove to limit the root of the paddle blade. At the same time, the first extension limiting groove is docked with the second extension limiting groove to limit the two extension parts on the corresponding open friction ring.

[0021] The present application adopts the above technical solution to limit the root of the paddle blade, the open friction ring, and the two extension parts connected to each open friction ring respectively through the corresponding limiting grooves, thereby improving the stability of the paddle blade connected between the upper paddle shell and the lower paddle shell.

[0022] Preferably, a threaded hole is provided in each first extension limiting groove, and the tail end of each adjusting screw passes through the corresponding two mounting through holes and is threadedly connected to the corresponding threaded hole. At the same time, each threaded hole is concentrically arranged with the corresponding debugging through hole.

[0023] The present application adopts the above technical solution. By inserting tools such as a wrench into the debugging through hole, operations can be performed on the corresponding adjusting screws, so that the process of adjusting the paddle blade is convenient and easy to operate.

[0024] Preferably, a limiting insertion block is vertically connected to the protruding end of the outer wall of the open friction ring close to the lower paddle housing, and the axis L of the limiting insertion block is parallel to the connection line O of the corresponding two extension parts; meanwhile, a limiting insertion hole is penetrated through the bottom of the first friction ring limiting groove corresponding to each open friction ring, and each limiting insertion block is inserted into the corresponding limiting insertion hole.

[0025] By adopting the above technical solution of the present application, the position of the open friction ring can be limited by inserting the limiting insertion block connected to the open friction ring into the corresponding limiting insertion hole, so that the open friction ring is not easily shaken, which is beneficial to improving the stability of the connection between the open friction ring and the lower paddle housing.

[0026] Preferably, a first central hole is penetrated through the center of the lower paddle housing, and at the same time, a second central hole is penetrated through the center of the lower paddle housing. When the upper paddle housing is connected to the lower paddle housing, the first central hole and the second central hole are concentrically butted to define a fan connection hole.

[0027] By adopting the above technical solution of the present application, the present application can be connected to the output shaft of the wind tunnel motor through the fan connection hole, so that the wind tunnel test can be carried out.

[0028] It can be seen from the above technical solution that, compared with the prior art, the present invention discloses a propeller structure for facilitating the adjustment of the blade angle in a wind tunnel test, and the following technical effects can be achieved:

[0029] When the blade angle needs to be adjusted during the wind tunnel test, it is no longer necessary to disassemble the upper paddle housing from the lower paddle housing, nor to disassemble the lower paddle housing from the output shaft of the wind tunnel motor. Instead, the paddle cap is disassembled from the upper paddle housing to expose the debugging through hole. Then, tools such as a wrench are directly inserted into the debugging through hole and act on the corresponding adjusting screw. The angle of the blade can be adjusted by loosening the adjusting screw, and the blade can be locked at the current angle by tightening the adjusting screw. Since the lower paddle housing and the upper paddle housing do not need to be disassembled from the output shaft of the wind tunnel motor during the process of adjusting the blade angle in the present application, it is convenient to adjust the blade angle, thus saving time cost. Description of the Drawings

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0031] Figure 1This is a schematic structural diagram of the present invention after removing the propeller cap.

[0032] Figure 2 It is Figure 1 a partial enlarged view of part A in

[0033] Figure 3 This is an exploded view of the structure of a propeller for facilitating the adjustment of the blade angle in a wind tunnel test according to the present invention.

[0034] Figure 4 It is Figure 3 a partial enlarged view of part B in

[0035] Figure 5 This is a schematic structural diagram of an open-type friction ring.

[0036] Figure 6 This is a schematic structural diagram of connecting part of the blades to the lower propeller housing.

[0037] Figure 7 This is a schematic structural diagram of the bottom end of the upper propeller housing.

[0038] Figure 8 This is a schematic overall structural diagram of a propeller for facilitating the adjustment of the blade angle in a wind tunnel test according to the present application before adjusting the blades (specifically, when the blade is adjusted by 0 degrees).

[0039] Figure 9 This is a schematic overall structural diagram of a propeller for facilitating the adjustment of the blade angle in a wind tunnel test according to the present application after adjusting the blades (specifically, when the blade is adjusted by 40 degrees).

[0040] Among them, 1 - lower propeller housing; 2 - blade; 3 - open-type friction ring; 4 - adjusting screw; 5 - upper propeller housing; 20 - debugging through hole; 31 - extension part; 310 - mounting through hole; 101 - first friction ring limiting groove; 102 - first extension limiting groove; 103 - first blade root limiting groove; 501 - second friction ring limiting groove; 502 - second extension limiting groove; 503 - second blade root limiting groove; 100 - threaded hole; 32 - limiting insert block; 10 - limiting jack; 111 - first central hole; 112 - second central hole; 6 - propeller cap. Specific embodiments

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0043] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] An embodiment of the present invention discloses a propeller structure for facilitating the adjustment of blade angles in a wind tunnel test, including:

[0045] Lower propeller housing 1;

[0046] Blades 2, there are multiple blades 2, which are spaced along the circumferential direction of the lower propeller housing 1, and an open friction ring 3 is sleeved on the root of each blade 2, and the two ends of the opening of each open friction ring 3 are connected to the lower propeller housing 1 through an adjusting screw 4;

[0047] Upper propeller housing 5, the upper propeller housing 5 is buckled and detachably connected to the lower propeller housing 1, and the root of each blade 2 is limited between the upper propeller housing 5 and the lower propeller housing 1. At the same time, there are debugging through holes 20 penetrating through the corresponding positions of the upper propeller housing 5 corresponding to the multiple adjusting screws 4;

[0048] Propeller cap 6, the upper propeller housing 5 is located between the lower propeller housing 1 and the propeller cap 6. At the same time, the propeller cap 6 is buckled and detachably connected to one end of the upper propeller housing 5 away from the lower propeller housing 1.

[0049] The working principle of the present application is as follows:

[0050] During the wind tunnel test, the two ends of the opening of each open friction ring 3 are connected to the lower propeller housing 1 through an adjusting screw 4 to lock the corresponding blade 2 at the current installation angle (see Figure 8), and the upper propeller shell 5 is in a state of being buckled and connected with the lower propeller shell 1, and the propeller cap 6 is in a state of being buckled and connected with the upper propeller shell 5. In this case, the lower propeller shell 1 and the upper propeller shell 5 are both connected to the output shaft of the wind tunnel motor to drive the overall rotation of the propeller structure of the present application through the wind tunnel motor, so that a wind tunnel test can be carried out (the wind tunnel test is a mature prior art, and the specific process of the wind tunnel test is irrelevant to the scheme protected by the present application, so the wind tunnel test will not be repeated here).

[0051] During the wind tunnel test, when the installation angle of blade 2 needs to be adjusted, the specific operation is as follows:

[0052] Remove the propeller cap 6 from the upper propeller shell 5 to expose the test through hole 20. At this time, there is no need to remove the upper propeller shell 5 from the lower propeller shell 1, nor is there any need to remove the lower propeller shell 1 from the output shaft of the wind tunnel motor. Instead, directly insert a tool such as a wrench into the debugging through hole 20 and act on the corresponding adjusting screw 4. The corresponding adjusting screw 4 can be loosened by turning the tool such as a wrench. At this time, the two ends of the opening of the open friction ring 3 will automatically separate, so that the open friction ring 3 no longer holds the root of the corresponding blade 2. At this time, the angle of the blade 2 can be rotated to the desired angle (see the state when the rotation angle of the blade 2 is 40 degrees). Figure 9 ), and then tighten the adjusting screw 4 by rotating the wrench or other tools in the opposite direction to lock the blade 2 at the current installation angle, and then connect the propeller cap 6 to the upper propeller shell 5, and start the wind tunnel motor to conduct the wind tunnel test again and read the test parameters.

[0053] In order to further optimize the above technical solution, the material of the open friction ring 3 is selected from 40CrNiMoA forged structural steel, which can ensure the elastic deformation of the open friction ring 3 when it is tightened by screws and in a free state, so as to achieve the clamping of the root of the blade 2 and the disengagement when rotation is required.

[0054] In order to further optimize the above technical solution, the adjusting screw 4 can specifically be a hexagon socket screw. In the process of adjusting the installation angle of the blade 2, the hexagon socket screw can be screwed by a hexagonal wrench to adjust the tightness of the hexagon socket screw, thereby adjusting the tightness and looseness of the root of the blade 2.

[0055] In order to further optimize the above technical solution, extension parts 31 are connected to both ends of the opening of each split friction ring 3, and the two extension parts 31 corresponding to each split friction ring 3 are butted against each other. At the same time, mounting through holes 310 are penetrated through the two extension parts 31 corresponding to each split friction ring 3, and the two mounting through holes 310 corresponding to each split friction ring 3 are concentrically butted. And a regulating screw 4 is inserted into each of the two mounting through holes 310 corresponding to each split friction ring 3, and the tail end of each regulating screw 4 is threadedly connected to the lower paddle housing 1. At the same time, the head end of each regulating screw 4 is limited at the outer end of the mounting through hole 310, so as to fasten the corresponding two extension parts 31 to the lower paddle housing 1 through the regulating screw 4.

[0056] Specifically: when the regulating screw 4 is loosened, the distance between the two extension parts 31 corresponding to each split friction ring 3 will increase, so that the split friction ring 3 will release the clamping effect on the root of the paddle blade 2. At this time, the paddle blade 2 can be rotated to adjust the installation angle of the paddle blade 2; when the installation angle of the paddle blade 2 is adjusted to the required angle (how to determine the exact angle is a mature prior art in wind tunnel tests and will not be elaborated here), then tightening the regulating screw 4 can lock the paddle blade 2 at the current angle.

[0057] In order to further optimize the above technical solution, each extension part 31 is integrally connected to the corresponding split friction ring 3 to improve the strength of this application and thus improve the service life.

[0058] In order to further optimize the above technical solution, a first friction ring limiting groove 101 is provided at the top end of the lower paddle housing 1 corresponding to each split friction ring 3. At the same time, a first extension limiting groove 102 and a first paddle blade root limiting groove 103 are respectively provided near each first friction ring limiting groove 101 at the top end of the lower paddle housing 1, and each first friction ring limiting groove 101 is communicated with the corresponding first extension limiting groove 102 and the corresponding first paddle blade root limiting groove 103;

[0059] A second friction ring limiting groove 501 is provided at the bottom end of the upper paddle housing 5 corresponding to each split friction ring 3. At the same time, a second extension limiting groove 502 and a second paddle blade root limiting groove 503 are respectively provided near each second friction ring limiting groove 501 at the top end of the upper paddle housing 5, and each second friction ring limiting groove 501 is communicated with the corresponding second extension limiting groove 502 and the corresponding second paddle blade root limiting groove 503. And a debugging through hole 20 is penetrated through the bottom of each second extension limiting groove 502;

[0060] When the upper paddle housing 5 is buckled and connected to the lower paddle housing 1, the first friction ring limiting groove 101 is docked with the second friction ring limiting groove 501 to limit the open-type friction ring 3, and the first paddle blade root limiting groove 103 is docked with the second paddle blade root limiting groove 503 to limit the root of the paddle blade 2. At the same time, the first extension limiting groove 102 is docked with the second extension limiting groove 502 to limit the two extensions 31 on the corresponding open-type friction ring 3.

[0061] To further optimize the above technical solution, threaded holes 100 are provided in each first extension limiting groove 102, and the tail ends of each adjusting screw 4 pass through the corresponding two mounting through holes 310 and are threadedly connected to the corresponding threaded holes 100. At the same time, each threaded hole 100 is concentrically arranged with the corresponding debugging through hole 20.

[0062] To further optimize the above technical solution, a limiting insertion block 32 is vertically connected to the outer wall protruding end of the open-type friction ring 3 close to the lower paddle housing 1, and the axis L of the limiting insertion block 32 is parallel to the connection line O of the corresponding two extensions 31. At the same time, a limiting insertion hole 10 is penetrated through the bottom of the first friction ring limiting groove 101 corresponding to each open-type friction ring 3, and each limiting insertion block 32 is inserted into the corresponding limiting insertion hole 10.

[0063] To further optimize the above technical solution, the limiting insertion block 32 is integrally connected to the open-type friction ring 3 to improve the strength of this application, thereby improving the service life of this application.

[0064] To further optimize the above technical solution, a first central hole 111 is penetrated through the center of the lower paddle housing 1, and at the same time, a second central hole 112 is penetrated through the center of the lower paddle housing 1. When the upper paddle housing 5 is connected to the lower paddle housing 1, the first central hole 111 is concentrically docked with the second central hole 112 to define a fan docking hole.

[0065] Specifically: The output shaft of the wind tunnel motor is inserted into the fan docking hole, and the output shaft of the wind tunnel motor is connected to the inner wall of the first central hole 111 through a key.

[0066] To improve the stability of the output shaft of the wind tunnel motor connected in the fan docking hole, the output shaft of the wind tunnel motor can also be connected to the inner wall of the second central hole 112 through a key.

[0067] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and for the relevant parts, reference can be made to the description in the method part.

[0068] The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A propeller structure for facilitating the adjustment of blade angles in wind tunnel tests, characterized in that, it includes: a lower propeller housing (1); blades (2), there are multiple of the blades (2), which are spaced along the circumferential direction of the lower propeller housing (1), and an open friction ring (3) is sleeved on the root of each blade (2), and both ends of the opening of each open friction ring (3) are connected to the lower propeller housing (1) by adjusting screws (4); an upper propeller housing (5), the upper propeller housing (5) is buckled and detachably connected to the lower propeller housing (1), and the root of each blade (2) is limited between the upper propeller housing (5) and the lower propeller housing (1), and at the same time, debugging through holes (20) are penetrated at multiple locations on the upper blade (2) housing corresponding to the multiple adjusting screws (4) one by one; a propeller cap (6), the upper propeller housing (5) is located between the lower propeller housing (1) and the propeller cap (6), and at the same time, the propeller cap (6) is buckled and detachably connected to the end of the upper propeller housing (5) away from the lower propeller housing (1).

2. The propeller structure for facilitating the adjustment of blade angles in wind tunnel tests according to claim 1, characterized in that, both ends of the opening of each open friction ring (3) are connected with extension parts (31), and the two extension parts (31) corresponding to each open friction ring (3) are butted, and at the same time, mounting through holes (310) are penetrated on the two extension parts (31) corresponding to each open friction ring (3), and the two mounting through holes (310) corresponding to each open friction ring (3) are concentrically butted, and one adjusting screw (4) is inserted into each of the two mounting through holes (310) corresponding to each open friction ring (3), and the tail end of each adjusting screw (4) is threadedly connected to the lower propeller housing (1), and at the same time, the head end of each adjusting screw (4) is limited at the outer end of the mounting through hole (310), so as to fasten the corresponding two extension parts (31) on the lower propeller housing (1) through the adjusting screw (4).

3. The propeller structure for facilitating the adjustment of blade angles in wind tunnel tests according to claim 2, characterized in that, at the top of the lower propeller housing (1), a first friction ring limiting groove (101) is opened at the position corresponding to each open friction ring (3), and at the same time, a first extension limiting groove (102) and a first blade root limiting groove (103) are respectively opened near each first friction ring limiting groove (101) at the top of the lower propeller housing (1), and each first friction ring limiting groove (101) is connected to the corresponding first extension limiting groove (102) and the corresponding first blade root limiting groove (103); At the bottom end of the upper paddle housing (5), a second friction ring limiting groove (501) is provided corresponding to each of the open friction rings (3). At the same time, a second extension limiting groove (502) and a second paddle blade root limiting groove (503) are respectively provided near the top end of the upper paddle housing (5) corresponding to each of the second friction ring limiting grooves (501). Each of the second friction ring limiting grooves (501) communicates with the corresponding second extension limiting groove (502) and the corresponding second paddle blade root limiting groove (503), and a debugging through hole (20) penetrates through the bottom of each of the second extension limiting grooves (502). When the upper paddle housing (5) is buckled and connected to the lower paddle housing (1), the first friction ring limiting groove (101) is docked with the second friction ring limiting groove (501) to limit the open friction ring (3), and the first paddle blade root limiting groove (103) is docked with the second paddle blade root limiting groove (503) to limit the root of the paddle blade (2). At the same time, the first extension limiting groove (102) is docked with the second extension limiting groove (502) to limit the two extension parts (31) on the corresponding open friction ring (3).

4. A propeller structure for facilitating the adjustment of the paddle blade angle in a wind tunnel test according to claim 3, characterized in that, Threaded holes (100) are provided on each of the first extension limiting grooves (102). The tail end of each adjusting screw (4) passes through the corresponding two mounting through holes (310) and is threadedly connected to the corresponding threaded hole (100). At the same time, each of the threaded holes (100) is concentrically arranged with the corresponding debugging through hole (20).

5. A propeller structure for facilitating the adjustment of the paddle blade angle in a wind tunnel test according to any one of claims 3-4, characterized in that, A limiting insertion block (32) is vertically connected to the protruding end of the outer wall of the open friction ring (3) close to the lower paddle housing (1). The axis L of the limiting insertion block (32) is parallel to the connection line O of the corresponding two extension parts (31). At the same time, a limiting insertion hole (10) penetrates through the bottom of the first friction ring limiting groove (101) corresponding to each open friction ring (3), and each limiting insertion block (32) is inserted into the corresponding limiting insertion hole (10).

6. A propeller structure for facilitating the adjustment of the paddle blade angle in a wind tunnel test according to claim 1, characterized in that, A first central hole (111) penetrates through the center of the lower paddle housing (1). At the same time, a second central hole (112) penetrates through the center of the lower paddle housing (1). When the upper paddle housing (5) is connected to the lower paddle housing (1), the first central hole (111) is concentrically docked with the second central hole (112) to define a fan docking hole.

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