A type of fan impeller

Abstract

This utility model provides a fan impeller, comprising: a hub with an installation space within it; an adjustment device disposed within the installation space; at least one long blade fixedly mounted on the hub; and at least one short blade movably mounted on the hub and connected to the adjustment device for adjusting the angle of the short blade relative to the hub. The technical problem solved by this utility model is that in related technologies, fan blades are fixed and their angles cannot be adjusted; when unstable conditions such as eddies or turbulence exist in the airflow, it is difficult to effectively guide the airflow, easily resulting in significant airflow resistance.

Description

Technical Field

[0001] This utility model relates to the field of wind turbine technology, and more specifically, to a wind turbine impeller. Background Technology

[0002] With the increasing demands on wind turbine performance from industrial production, energy development, and civil equipment sectors, the aerodynamic efficiency, operational stability, and adaptability of wind turbine impellers, as core components, have become key areas for technological improvement.

[0003] In industrial settings such as power, metallurgy, and chemicals, fans need to meet the airflow transport requirements under different loads; in the new energy field such as wind power generation, fans need to adapt to the dynamic changes in wind speed and direction; and in civil air conditioning and ventilation systems, fans need to balance energy efficiency and noise reduction performance.

[0004] However, the relevant technologies have at least one of the following problems: the fan blades in the relevant technologies are fixed and the angle cannot be adjusted; when there are unstable conditions such as eddies and turbulence in the airflow, it is difficult to effectively guide the airflow and it is easy to generate large airflow resistance. Utility Model Content

[0005] The technical problem solved by this utility model is that the fan blades of the fans in the related technologies are fixed and the angle cannot be adjusted; when there are unstable conditions such as eddies and turbulence in the airflow, it is difficult to effectively guide the airflow and it is easy to generate large airflow resistance.

[0006] To solve the above problems, this utility model provides a fan impeller, including: a hub with an installation space inside the hub; an adjustment device located in the installation space; at least one long blade fixedly mounted on the hub; and at least one short blade movably mounted on the hub and connected to the adjustment device for adjusting the angle of the short blade relative to the hub.

[0007] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: Compared with the fixed fan blades in related technologies, this utility model ensures basic aerodynamic performance by setting fixed long blades, while setting movable short blades that are connected to the adjustment device to adjust the angle of the short blades relative to the hub; it can adjust the angle of the short blades relative to the hub according to different working conditions, thereby adapting to different airflow states and effectively reducing airflow resistance.

[0008] In one embodiment of this utility model, the hub is provided with a first opening communicating with the installation space; the adjustment device includes: a linkage part; a short blade is connected to the linkage part through the first opening; and an adjustment part, which is provided on the linkage part and is used to drive the linkage part to reciprocate along the length direction of the hub.

[0009] Compared with existing technologies, the technical effects achieved by this technical solution are as follows: the first opening on the hub and the linkage and adjustment parts in the adjustment device are clearly defined; the adjustment part is used to drive the linkage part to reciprocate along the length of the hub, providing a power source for the adjustment of the short blade angle; the short blade is connected to the linkage part through the first opening on the hub, and the adjustment part drives the linkage part to reciprocate along the length of the hub, forming a stable transmission path and ensuring the accuracy and consistency of the short blade angle adjustment.

[0010] In one embodiment of this utility model, a partition plate is provided inside the hub to divide the installation space into an injection space and an active space; the linkage is located in the active space; the adjustment part includes: a piston, which is located in the injection space; an injection pipe, one end of which is connected to the piston and the other end of which is located in the active space; and a hydraulic pump, which is connected to the injection pipe; wherein, when the hydraulic pump injects hydraulic oil into the injection space through the injection pipe, the angle of the short blades relative to the hub changes.

[0011] Compared with existing technologies, the technical effects achieved by this technical solution are as follows: the installation space is divided into a liquid injection space and an active space by a partition plate; the adjustment unit, consisting of a hydraulic pump, a liquid injection pipe and a piston, drives the piston to move by injecting hydraulic oil, thereby changing the posture of the short blades; the hydraulic transmission drive force is stable and responsive, and can work reliably when the impeller is rotating at high speed, ensuring the timeliness of the adjustment action.

[0012] In one embodiment of this utility model, the piston divides the injection space into a first space and a second space; the injection tube is provided with a first passage and a second passage; the first passage is connected to the first space; the second passage is connected to the second space; wherein, when hydraulic oil is injected into the first space, the short blade rotates in a first direction; when hydraulic oil is injected into the second space, the short blade rotates in a second direction opposite to the first direction.

[0013] Compared with existing technologies, the technical effects achieved by this technical solution are as follows: the piston divides the injection space into a first space and a second space, and the first and second passages of the injection pipe connect the two spaces respectively. By injecting hydraulic oil into different spaces, the short blades can rotate in opposite first and second directions, which expands the angle adjustment range, can flexibly cope with diverse airflow scenarios, and further optimize the airflow guidance effect.

[0014] In one embodiment of this utility model, the linkage includes: a connector disposed on the injection pipe, and a groove provided on the side of the connector near the short blade; a connecting plate rotatably disposed at the first opening, and one end of the connecting plate being fixedly connected to the short blade; and a connecting column disposed at the other end of the connecting plate, and the connecting column being located in the groove; wherein, when hydraulic oil is injected into the first space, the connecting column moves relative to the groove toward the direction of the first space, and drives the connecting plate to rotate in the first direction; when hydraulic oil is injected into the second space, the connecting column moves relative to the groove away from the direction of the first space, and drives the connecting plate to rotate in the second direction.

[0015] Compared with existing technologies, the technical effects achieved by this technical solution are as follows: the linkage unit, through the cooperation of the sliding groove, connecting plate and connecting column of the connecting part, converts the linear motion driven by the injection tube into the rotational motion of the connecting plate, that is, when the connecting column slides in the sliding groove, it drives the connecting plate to rotate; this structure efficiently converts linear motion and rotational motion, with high transmission efficiency, low mechanical loss, and ensures the accuracy of short blade angle adjustment.

[0016] In one embodiment of this utility model, the wheel hub is also provided with a stop corresponding to the first opening; the stop is provided on the side of the connecting plate away from the connecting member; a second opening is left on the stop, and a fixing seat is also provided on the short blade, and the fixing seat is fixedly connected to the connecting plate through the second opening.

[0017] Compared with the existing technology, the technical effects achieved by adopting this technical solution are as follows: the stop is set on the side of the connecting plate away from the connecting member and is set corresponding to the first opening, which can form an axial limit on the connecting plate and effectively prevent the connecting plate from falling out of the first opening; at the same time, the second opening provides space for the fixed connection between the short blade and the connecting plate, and does not affect the angle adjustment action of the short blade while ensuring the connection stability.

[0018] In one embodiment of this utility model, a shock-absorbing pad is provided at the connection between the fixed base and the short blade.

[0019] Compared with existing technologies, the technical effects achieved by this solution are as follows: the shock-absorbing pads installed at the connection between the fixed base and the short blades can effectively reduce the vibration and noise generated during blade rotation, thereby improving the stability and comfort of the fan operation.

[0020] In one embodiment of this utility model, the injection tube is also provided with a through hole, which connects the second passage and the second space.

[0021] Compared with existing technologies, the technical effects achieved by this technical solution are as follows: the through holes on the injection pipe ensure stable communication between the second passage and the second space, guaranteeing the smoothness of injecting or discharging hydraulic oil into the second space, and avoiding the impact of passage blockage on the adjustment effect of the short blade rotating in the second direction.

[0022] In one embodiment of this invention, the angle adjustment range of the short blade relative to the hub is 0 degrees to 15 degrees.

[0023] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: the angle adjustment range of the short blades relative to the hub is limited to 0 degrees to 15 degrees. This range ensures the airflow guidance effect while avoiding damage to the aerodynamic balance of the impeller due to excessive angle, thus ensuring the stability and safety of the fan operation.

[0024] In one embodiment of this utility model, both the long blade and the short blade are streamlined, and the cross-sections of both the long blade and the short blade are airfoil structures.

[0025] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: both the long and short blades adopt a streamlined design and an airfoil structure in cross-section. The long blades ensure basic aerodynamic efficiency, and the airfoil structure can still maintain good airflow guidance capability when the angle of the short blades is adjusted. Even if the angle changes, the airflow impact can be reduced, further reducing drag and improving overall aerodynamic performance.

[0026] By adopting the technical solution of this utility model, the following technical effects can be achieved:

[0027] (1) This utility model ensures basic aerodynamic performance by setting fixed long blades, and at the same time sets movable short blades that are connected to the adjustment device to adjust the angle of the short blades relative to the hub; it can adjust the angle of the short blades relative to the hub according to different working conditions, thereby adapting to different airflow states and effectively reducing airflow resistance;

[0028] (2) In this utility model, the linkage part converts the linear motion driven by the injection tube into the rotational motion of the connecting plate through the cooperation of the sliding groove, connecting plate and connecting column of the connecting part. That is, when the connecting column slides in the sliding groove, it drives the connecting plate to rotate. This structure efficiently converts linear motion and rotational motion, with high transmission efficiency and low mechanical loss, ensuring the accuracy of short blade angle adjustment.

[0029] (3) Both the long and short blades in this utility model adopt a streamlined design and have an airfoil structure in cross section. The long blade ensures basic aerodynamic efficiency, and the airfoil structure can still maintain good airflow guidance capability when the angle of the short blade is adjusted. Even if the angle changes, the airflow impact can be reduced, further reducing drag and improving overall aerodynamic performance. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 A schematic diagram of the equiaxed side structure of a fan impeller provided for an embodiment of this utility model;

[0032] Figure 2 for Figure 1 The front view of the fan impeller shown;

[0033] Figure 3 for Figure 2 A cross-sectional view along the AA direction;

[0034] Figure 4 for Figure 3 A magnified view of a section at point B in the middle;

[0035] Figure 5 for Figure 2 The top view of the fan impeller shown;

[0036] Figure 6 for Figure 2 The cross-sectional view along the AA direction after the short blade angle has been adjusted;

[0037] Figure 7 for Figure 6 A magnified view of a section at point C;

[0038] Figure 8 for Figure 6 A magnified view of a section at point D;

[0039] Figure 9 for Figure 6 The image shows a front view of the wind turbine impeller after the short blades have been adjusted.

[0040] Figure 10 This is a schematic diagram showing the coordination relationship of the adjustment devices.

[0041] Explanation of reference numerals in the attached figures:

[0042] 100. Fan impeller; 10. Hub; 12. Divider plate; 13. Liquid injection space; 131. First space; 132. Second space; 14. Movement space; 15. Stop; 20. Adjustment device; 21. Linkage part; 211. Connector; 212. Slide groove; 213. Connecting plate; 214. Connecting column; 221. Piston; 222. Liquid injection pipe; 2221. First passage; 2222. Second passage; 2223. Through hole; 223. Liquid tank; 30. Long blade; 40. Short blade; 41. Fixing seat. Detailed Implementation

[0043] The embodiments of this utility model will now be described in detail. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0044] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0045] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0046] See Figure 1 , Figure 1 A schematic diagram of the structure of a fan impeller provided for an embodiment of this utility model; combined with Figures 2 to 10 Specifically, a wind turbine impeller 100 includes: a hub 10, an adjusting device 20, at least one long blade 30, and at least one short blade 40; wherein, the hub 10 has an installation space; the adjusting device 20 is located in the installation space; the long blade 30 is fixedly mounted on the hub 10; the short blade 40 is movably mounted on the hub 10 and is connected to the adjusting device 20 for transmission to adjust the angle of the short blade 40 relative to the hub 10.

[0047] Preferably, each short blade 40 is provided with an adjustment device 20.

[0048] For preferred options, please refer to [link / reference]. Figure 2 There are four long blades 30, which are evenly distributed along the axis of the hub 10 and are fixed to the hub 10 by welding or bolting.

[0049] For preferred options, please refer to [link / reference]. Figure 2 There are four short blades 40, and there is a short blade 40 between each two adjacent long blades 30. Each short blade 40 is movably mounted on the hub 10 and is connected to the corresponding adjustment device 20.

[0050] Preferably, the length of the long blade 30 is in the range of 300 mm to 500 mm.

[0051] Preferably, the length of the short blade 40 ranges from 150 mm to 250 mm.

[0052] For further information, please refer to [link / reference]. Figure 3 The hub 10 is provided with a first opening communicating with the installation space; the adjustment device 20 includes a linkage part 21 and an adjustment part; the adjustment part is provided on the linkage part 21 and is used to drive the linkage part 21 to reciprocate along the length direction of the hub 10 to change the angle of the short blade 40 relative to the hub 10; wherein, the short blade 40 is connected to the linkage part 21 through the first opening.

[0053] Specifically, please refer to Figure 5 and Figure 9 The short blade 40 is connected to the linkage 21, and the adjustment part is used to drive the linkage 21 to reciprocate along the length direction of the hub 10, so as to make the short blade 40 rotate relative to the hub 10, so as to adjust the angle of the short blade 40 relative to the hub 10.

[0054] For further information, please refer to [link / reference]. Figure 4 The hub 10 is provided with a partition plate 12 to divide the installation space into an injection space 13 and an active space 14; the linkage 21 is located in the active space 14; the adjustment part includes: a piston 221, an injection pipe 222 and a hydraulic pump; the piston 221 is located in the injection space 13; one end of the injection pipe 222 is connected to the piston 221 and the other end is located in the active space 14; the hydraulic pump is connected to the injection pipe 222; wherein, when the hydraulic pump injects hydraulic oil into the injection space 13 through the injection pipe 222, the angle of the short blade 40 relative to the hub 10 changes.

[0055] Furthermore, the adjustment section is also equipped with a liquid tank 223, which is located in the active space 14; and the liquid tank 223 is connected to the injection pipe 222.

[0056] For further information, please refer to [link / reference]. Figure 4The piston 221 divides the injection space 13 into a first space 131 and a second space 132. The injection pipe 222 is provided with a first passage 2221 and a second passage 2222. The first passage 2221 is connected to the first space 131. The second passage 2222 is connected to the second space 132. When hydraulic oil is injected into the first space 131, the short blade 40 rotates in a first direction. When hydraulic oil is injected into the second space 132, the short blade 40 rotates in a second direction opposite to the first direction.

[0057] Furthermore, the injection tube 222 is also provided with a through hole 2223, which connects the second passage 2222 and the second space 132.

[0058] Specifically, please refer to Figures 6 to 9 During the adjustment of the angle between the short blade 40 and the hub 10, the hydraulic pump injects hydraulic oil from the tank 223 into the first space 131 through the first passage 2221. The piston 221 moves towards the direction of the active space 14, and at the same time, the piston 221 drives the injection pipe 222 to move away from the first space 131, thereby driving the linkage 21 to move synchronously, causing the short blade 40 to rotate in the first direction. Conversely, the hydraulic pump draws out the hydraulic oil from the first space 131 and injects it into the second space 132 through the second passage 2222 and the through hole 2223. At this time, the piston 221 moves away from the active space 14, and at the same time drives the hydraulic pipe to move towards the first space 131, thereby driving the linkage 21 to move synchronously, causing the short blade 40 to rotate in the second direction opposite to the first direction.

[0059] For further information, please refer to [link / reference]. Figures 6 to 9 The linkage 21 includes: a connector 211, a connecting plate 213, and a connecting post 214; the connector 211 is disposed on the injection pipe 222, and a groove 212 is provided on the side of the connector 211 near the short blade 40; the connecting plate 213 is rotatably disposed at the first opening, and one end of the connecting plate 213 is fixedly connected to the short blade 40; the connecting post 214 is disposed at the other end of the connecting plate 213, and the connecting post 214 is located in the groove 212; wherein, when hydraulic oil is injected into the first space 131, the connecting post 214 moves relative to the groove 212 toward the direction of the first space 131, and drives the connecting plate 213 to rotate in the first direction; when hydraulic oil is injected into the second space 132, the connecting post 214 moves relative to the groove 212 away from the direction of the first space 131, and drives the connecting plate 213 to rotate in the second direction.

[0060] For preferred options, please refer to [link / reference]. Figure 10 The slide 212 is inclined relative to the connector 211.

[0061] Preferably, the connecting column 214 is tangent to the corresponding inner wall of the slide groove 212.

[0062] Depending on the specific application, as the injection tube 222 moves away from the first space 131, the connector 211 will move synchronously with the injection tube 222. Since the slide groove 212 is inclined relative to the connector 211 and the connecting plate 213 is rotatably located at the first opening, the connector 211 will drive the connecting column 214 to move relative to the slide groove 212, thereby driving the connecting plate 213 to rotate, thus causing the short blade 40 to rotate.

[0063] For further information, please refer to [link / reference]. Figure 6 The hub 10 is also provided with a stop 15 corresponding to the first opening; the stop 15 is located on the side of the connecting plate 213 away from the connecting member 211; the stop 15 has a second opening and the short blade 40 is also provided with a fixing seat 41, which is fixedly connected to the connecting plate 213 through the second opening.

[0064] Depending on the specific application, an annular stop 15 is provided at the first opening, and the stop 15 is located on the side of the connecting plate 213 away from the connecting seat, that is, close to the outside of the hub 10. This setting can limit the axial displacement of the connecting plate 213 to the outside of the hub 10, so as to prevent the connecting plate 213 from falling off from the first opening. The stop 15 is also provided with a second opening, the inner diameter of which is smaller than the diameter of the connecting plate 213. A fixing seat 41 is provided at the root of the short blade 40. The fixing seat 41 extends into the hub 10 through the second opening and is fixedly connected to the connecting plate 213 by bolts.

[0065] Furthermore, a shock-absorbing pad is provided at the connection between the fixed base 41 and the short blade 40.

[0066] Furthermore, the angle adjustment range of the short blade 40 relative to the hub 10 is 0 degrees to 15 degrees.

[0067] Furthermore, both the long blade 30 and the short blade 40 are streamlined, and the cross-sections of both the long blade 30 and the short blade 40 are airfoil structures.

[0068] Furthermore, this utility model also provides an installation method for a fan impeller 100, including: drive shaft positioning installation and impeller installation; the drive shaft positioning installation specifically involves using a laser alignment instrument to position the fan drive shaft, ensuring that its horizontality error does not exceed 0.05 mm / meter and its coaxiality error is within ±0.03 mm, and cleaning the surface of the drive shaft to ensure that there is no oil or impurities.

[0069] During impeller installation, ensure a tight fit between the impeller and the drive shaft without any gaps. After installation, use a dial indicator to check the radial runout and axial runout of the impeller. The radial runout error should not exceed 0.08 mm, and the axial runout error should not exceed 0.05 mm.

[0070] Furthermore, this utility model also provides a material selection for the fan impeller 100, where both the long blades 30 and the short blades 40 are made of high-strength aluminum alloy, such as A380 alloy, and ensures that the alloy element content meets the standards, the tensile strength is not less than 270 MPa, and the elongation is not less than 3%.

[0071] Furthermore, this utility model also provides a manufacturing process for a fan impeller 100, specifically including: using CAD / CAM software to design a three-dimensional mold model based on the structure of long and short impellers; during the design process, focusing on optimizing the mold parting surface to ensure that the impeller can be demolded smoothly; rationally planning the gating system to ensure that the molten aluminum fills the mold cavity quickly and evenly; and scientifically designing the exhaust system to avoid defects such as porosity during the die casting process, thus laying the foundation for high-quality impeller forming.

[0072] Furthermore, the die-casting machine parameters are precisely adjusted according to the impeller structure and dimensions. The injection specific pressure is set at 80-120 MPa, the injection speed is controlled at 3-6 m / s, the filling time is maintained at 0.05-0.15 seconds, and the holding time is approximately 5-10 seconds. These parameters, when set appropriately, ensure that the molten aluminum alloy fills the mold cavity quickly and stably under high pressure, and that the impeller is fully formed during the holding stage, guaranteeing the dimensional accuracy and internal quality of the impeller.

[0073] Next, the molten and purified aluminum alloy liquid is injected into the mold cavity, the die casting machine is started, and the aluminum alloy liquid is rapidly filled and pressure is maintained under the set parameters until the impeller is formed. After the die casting is completed, the mold is cooled to 200-250℃, the mold is opened, and the impeller is pushed out using the ejection mechanism to complete the demolding process. After demolding, the impeller is cleaned in time to remove the surface flash and burrs, so that the impeller initially has the appearance of a finished product.

[0074] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A fan impeller, characterized by, include: A hub (10) having an installation space inside; An adjustment device (20) is provided in the installation space; At least one long blade (30) is fixedly mounted on the hub (10); At least one short blade (40) is movably disposed on the hub (10) and is connected to the adjusting device (20) for adjusting the angle of the short blade (40) relative to the hub (10).

2. The fan impeller according to claim 1, characterized in that, The hub (10) is provided with a first opening communicating with the mounting space; The regulating device (20) includes: Linkage part (21); the short blade (40) is connected to the linkage part (21) through the first opening; An adjustment unit is provided on the linkage unit (21) and is used to drive the linkage unit (21) to reciprocate along the length direction of the hub (10).

3. The fan impeller according to claim 2, characterized in that, The hub (10) is provided with a partition plate (12) to divide the installation space into an injection space (13) and an activity space (14). The linkage (21) is located in the activity space (14); The adjustment unit includes: Piston (221), the piston (221) is disposed in the injection space (13). Injection tube (222), one end of which is connected to the piston (221), and the other end is located in the active space (14). A hydraulic pump, which is connected to the injection pipe (222); When the hydraulic pump injects hydraulic oil into the injection space (13) through the injection pipe (222), the angle of the short blade (40) relative to the hub (10) changes.

4. The fan impeller according to claim 3, characterized in that, The piston (221) divides the injection space (13) into a first space (131) and a second space (132). The injection tube (222) is provided with a first passage (2221) and a second passage (2222); The first passage (2221) is connected to the first space (131); The second passage (2222) is connected to the second space (132); When hydraulic oil is injected into the first space (131), the short blade (40) rotates in the first direction; When hydraulic oil is injected into the second space (132), the short blade (40) rotates in a second direction opposite to the first direction.

5. The fan impeller according to claim 4, characterized in that, The linkage (21) includes: Connector (211), the connector (211) is provided on the injection tube (222), and the connector (211) has a groove (212) on the side near the short blade (40). A connecting disk (213) is rotatably disposed at the first opening, and one end of the connecting disk (213) is fixedly connected to the short blade (40); A connecting post (214) is provided at the other end of the connecting plate (213), and the connecting post (214) is located in the slide groove (212); When hydraulic oil is injected into the first space (131), the connecting column (214) moves relative to the slide groove (212) toward the direction of the first space (131) and drives the connecting plate (213) to rotate in the first direction; When hydraulic oil is injected into the second space (132), the connecting column (214) moves away from the first space (131) relative to the slide groove (212), and drives the connecting plate (213) to rotate in the second direction.

6. The fan impeller according to claim 5, characterized in that, The hub (10) is also provided with a stop (15) corresponding to the first opening; The stop (15) is located on the side of the connecting plate (213) opposite to the connecting member (211); The stop (15) has a second opening. The short blade (40) is also provided with a fixing seat (41), which is fixedly connected to the connecting plate (213) through the second opening.

7. The fan impeller according to claim 6, characterized in that, A shock-absorbing pad is provided at the connection between the fixed base (41) and the short blade (40).

8. The wind turbine impeller according to any one of claims 4 to 7, characterized in that, The injection tube (222) is also provided with a through hole (2223), which connects the second passage (2222) and the second space (132).

9. The fan impeller according to any one of claims 1 to 7, characterized in that, The angle adjustment range of the short blade (40) relative to the hub (10) is 0 degrees to 15 degrees.

10. The wind turbine impeller according to any one of claims 1 to 7, characterized in that, Both the long blade (30) and the short blade (40) are streamlined, and both the long blade (30) and the short blade (40) have airfoil structures in their cross-sections.

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