Wind turbine blade subjected to plasma surface treatment

Abstract

The utility model discloses a wind turbine blade subjected to plasma surface treatment, and mainly relates to the field of wind turbine blades. Comprising a hub and three blades subjected to plasma surface treatment, three fixing frames are arranged on the front end face of the hub in a circular array mode, mounting blocks are slidably inserted into the three fixing frames, a positioning rod is arranged in the middle of the front end face of the hub, and inserting blocks are arranged at the ends, close to the positioning rod, of the mounting blocks correspondingly; the periphery of the positioning rod is provided with inserting grooves corresponding to the three inserting blocks respectively, the inserting blocks are connected with the corresponding inserting grooves in an inserted mode respectively, the top end of the positioning rod is provided with inserting holes penetrating through the positioning rod and the three inserting blocks respectively, and the inserting holes are internally connected with limiting bolts in a threaded mode. The three-blade quick mounting device has the advantages that the inserting blocks are connected with the inserting grooves in an inserted mode by sliding the mounting blocks, then the inserting blocks are fixed in the positioning rods through the limiting bolts to achieve quick assembly and fixation of the three blades, operation is easy and convenient, and the effect that the three blades are quickly mounted in a labor-saving mode is achieved.

Description

Technical Field

[0001] The utility model relates to the field of wind turbine blades, in particular to a wind turbine blade subjected to plasma surface treatment. Background Art

[0002] A wind turbine is an electrical device that converts wind energy into mechanical work, which drives the rotor to rotate and ultimately outputs alternating current. The working principle of a wind turbine is relatively simple. The wind rotor rotates under the action of wind force, converting the kinetic energy of the wind into mechanical energy of the wind rotor shaft. The generator rotates under the drive of the wind rotor shaft to generate electricity. The generator blades are the most important and basic components of a wind turbine.

[0003] Existing wind turbine blades generally include three evenly distributed blades, a first flange fixedly connected to one side of the outer wall of the three blades, a blade hub, and three second flanges fixedly connected to the outer wall of the blade hub. The three first flanges and the three second flanges are fixedly connected by multiple bolts. The installation process is as follows: when the three blades are to be installed, the three first flanges and the three second flanges need to be tightened separately by multiple bolts.

[0004] The above-mentioned wind turbine blades have the disadvantage that when the three blades are to be installed, the three first flanges and the three second flanges need to be fastened separately by multiple bolts, which is time-consuming and labor-intensive, and the process is complicated, making it inconvenient to install the blades. Utility Model Content

[0005] The purpose of the utility model is to provide a wind turbine blade with plasma surface treatment, which realizes the rapid assembly and fixation of three blades by sliding the mounting block to connect the insert block with the slot, and then fixing the insert block in the positioning rod by limiting bolts. The operation is simple and convenient, and the effect of rapid and labor-saving installation of the three blades is achieved.

[0006] In order to achieve the above-mentioned purpose, the present invention is realized through the following technical solutions:

[0007] A plasma surface-treated wind turbine blade comprises a hub and three plasma surface-treated blades, wherein the front end surface of the hub is provided with three fixing frames in a circular array, and mounting blocks are slidably inserted in the three fixing frames, a positioning rod is provided in the middle of the front end surface of the hub, and the mounting blocks are respectively provided with plug-in blocks at one end close to the positioning rod, and the three plug-in blocks have different heights. Slots are respectively provided on the outer periphery of the positioning rod corresponding to the three plug-in blocks, and the plug-in blocks are respectively plugged into the corresponding slots. The top end of the positioning rod is provided with insertion holes that respectively penetrate the positioning rod and the three plug-in blocks, and the inner thread of the insertion hole is connected to a limiting bolt, and the limiting bolt also respectively penetrates the three plug-in blocks, and the blades are respectively connected to the end of the mounting block away from the positioning rod.

[0008] Furthermore, each of the three mounting blocks is provided with an arc-shaped groove, and a limit ring is threadedly connected to the inner surface of the arc-shaped groove.

[0009] Furthermore, a rocker is provided on the limiting ring.

[0010] Furthermore, a sealing cover is threadedly connected to the top end of the positioning rod.

[0011] Furthermore, an elastic limiting device is provided on the fixing frame.

[0012] Furthermore, the elastic limiting device includes mounting shells respectively arranged on the top of the three fixed frames, the top of the mounting shell is provided with limiting pins respectively passing through the mounting shell and the top of the fixed frame, the mounting block is provided with limiting holes plugged into the limiting pins, the part of the limiting pin located in the fixed shell is provided with a limiting block, the limiting pin is covered with a spring, and the spring is located between the top of the limiting block and the top inside the mounting shell.

[0013] Furthermore, the limiting bolts are respectively threadedly connected to the three insert blocks.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] This patent limits the direction of the blades and the angle between adjacent blades by sliding the mounting block and the fixed frame, and makes the plug-in block at the end of the mounting block plug into the slot on the outer periphery of the positioning rod, so that the sockets on the three plug-in blocks overlap and overlap with the sockets in the positioning rod. After the limit bolts are inserted into the sockets, they are threaded and pass through the sockets of the three plug-in blocks respectively, thereby fixing the plug-in blocks in the slots, so that the three mounting blocks and three blades can be fixed at the same time, realizing rapid assembly and fixation of the blades, simple and convenient operation, fast and labor-saving installation, and better practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attachment Figure 1 It is a schematic diagram of the top structure of the utility model.

[0017] Attachment Figure 2 It is a main structural sectional view of the present utility model.

[0018] Attachment Figure 3 It is a top view structural diagram of the fixing frame and the mounting block of the utility model.

[0019] Attachment Figure 4 This utility model is attached Figure 2 Enlarged view of the structure of part A in the middle.

[0020] Attachment Figure 5 This utility model is attached Figure 2 Enlarged view of the structure of part B in the middle.

[0021] Reference numerals shown in the accompanying drawings:

[0022] 1. Hub; 2. Blades; 3. Fixing frame; 4. Mounting block; 5. Positioning rod; 6. Insert block; 7. Slot; 8. Socket; 9. Limit bolt; 10. Arc groove; 11. Limit ring; 12. Rocker; 13. Cover; 14. Mounting shell; 15. Limit pin; 16. Limit hole; 17. Limit block; 18. Spring. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the contents of this invention, those skilled in the art may make various changes or modifications to the present invention, and that these equivalent forms also fall within the scope defined in this application.

[0024] The utility model discloses a wind turbine blade subjected to plasma surface treatment. The main structure includes a hub 1 and three blades 2 subjected to plasma surface treatment. The treatment method and equipment are both mature existing technologies. The specific structure and principle are not described in detail here. After the blades 2 are subjected to plasma surface treatment, the following effects are achieved:

[0025] 1) The energy of plasma excitation injection is equivalent to the energy source term coupled with the fluid flow NS equation. A plasma aerodynamic excitation model is established. It is feasible to control the airfoil flow separation by numerical simulation of plasma excitation.

[0026] 2) Numerical simulations of plasma actuation applied at a 10% position on the airfoil's upper edge demonstrate that applying plasma actuation in the separation region improves the airfoil's aerodynamic characteristics. At an angle of attack of 17°, the lift coefficient increased from 1.478 to 1.748, while the drag coefficient decreased from 0.0462 to 0.036. After actuation, the airfoil's lift coefficient increased by 18.27% and its drag decreased by 22.09%, demonstrating a significant actuation effect. Plasma actuation was observed to have a significant lift-enhancing effect on the airfoil's leading edge, improving the airfoil's lift-drag characteristics and delaying the stall angle of attack from 17° to 20°.

[0027] 3) When the angle of attack is 17° and 20°, after applying plasma aerodynamic excitation, new energy is injected into the boundary layer, the flow velocity in the boundary layer is increased, the adverse pressure gradient and low-energy airflow accumulation are reduced, and to a certain extent, the control effect of delaying and slowing down the boundary layer separation and eliminating the vortex to suppress flow separation can be achieved.

[0028] 4) Applying excitation has the effect of increasing lift and reducing drag on airfoils of different thicknesses, different cambers, and different maximum thickness positions, but it also affects the excitation effect. As the thickness and camber increase, the excitation effect and the improvement of aerodynamic characteristics are weakened. In addition, the forward or backward movement of the maximum thickness position will affect the improvement of aerodynamic characteristics and the excitation control effect.

[0029] 5) When the angle of attack is 20°, the applied excitation voltage peak value is from 10-20kV, the lift coefficient increases from 1.475 to 1.725, an increase of 16.9%, and the drag coefficient decreases from 0.11 to 0.0797, a decrease of 27.5%. Within a certain range, the larger the excitation voltage peak value, the greater the rate of increase in the lift coefficient and the rate of decrease in the drag coefficient, and the better the flow separation control effect. When the applied excitation frequency is from 1-4kHz, the lift coefficient increases from 1.415 to 1.725, an increase of 21.9%, and the drag coefficient decreases from 0.131 to 0.08, a decrease of 38.9%. This improves the aerodynamic characteristics of the airfoil and improves the effect of suppressing flow separation. However, when the frequency is increased to 5kHz, the aerodynamic characteristics are reduced and the flow control effect is weakened.

[0030] The front end surface of the hub 1 is provided with three fixed frames 3 in a circular array, and mounting blocks 4 are slidably inserted into the three fixed frames 3. A positioning rod 5 is provided in the middle of the front end surface of the hub 1, and an insert block 6 is provided at one end of the mounting block 4 close to the positioning rod 5. The heights of the three insert blocks 6 are different, as shown in the attached figure. Figure 5 As shown, in order to ensure that the three plug-in blocks 6 can overlap after being plugged into the slots 7, the outer periphery of the positioning rod 5 is respectively provided with slots 7 corresponding to the three plug-in blocks 6, and the plug-in blocks 6 are respectively plugged into the corresponding slots 7. The top of the positioning rod 5 is provided with jacks 8 that respectively penetrate the positioning rod 5 and the three plug-in blocks 6. The jacks 8 of the three plug-in blocks 6 can overlap after the plug-in blocks 6 are plugged into the slots 7. The inner thread of the jack 8 is connected to the limiting bolt 9, and the limiting bolt 9 also penetrates the three plug-in blocks 6 respectively. The blades 2 are respectively connected to the end of the mounting block 4 away from the positioning rod 5, and are connected through the mounting block 4. It is slidably plugged into the fixing frame 3 to limit the direction of the blade 2 and the angle between adjacent blades 2, and the plug block 6 at the end of the mounting block 4 is plugged into the slot 7 on the outer periphery of the positioning rod 5, so that the socket holes 8 on the three plug blocks 6 overlap and overlap with the socket holes 8 in the positioning rod 5, and the limiting bolt 9 is inserted into the socket hole 8 and screwed so that the limiting bolt 9 is threadedly connected with the socket hole 8 and passes through the socket holes 8 of the three plug blocks 6 respectively, thereby fixing the plug block 6 in the slot 7 and fixing the mounting block 4 in a position close to the positioning rod 5, so as to fix the three mounting blocks 4 and the three blades 2 at the same time.

[0031] Preferably, the three mounting blocks 4 are each provided with an arc groove 10, and the arc groove 10 is internally threadedly connected to a limit ring 11. After the three mounting blocks 4 are plugged into the fixed frame 3 and the plug block 6 is also plugged into the slot 7, the end face of the mounting block 4 just rests against the outer circumferential surface of the positioning rod 5, so that the three arc grooves 10 are located on the same circular ring. At this time, the limit ring 11 can cooperate with the three arc grooves 10, so that the limit ring 11 can enter the interior of the three arc grooves 10, and the inner side wall or outer side wall of the limit ring 11 can be threadedly connected to the inner wall of the arc groove 10, so that the limit ring 11 is firmly embedded in the arc groove 10, which can further play a role in fixing and limiting the position of the mounting block 4, ensuring the firmness of the mounting block 4 after installation, thereby ensuring the stability of the overall structure after the blade 2 is installed.

[0032] Preferably, a rocker 12 is provided on the limiting ring 11 to facilitate the rotation of the limiting ring 11 and to more conveniently enable the limiting ring 11 to be threadedly connected to the arc groove 10 .

[0033] Preferably, a cover 13 is threadedly connected to the top of the positioning rod 5, and the cover 13 is used to block the outer end of the socket 8 to prevent water from entering the socket 8 and causing the limit bolt 9 to be corroded. It can also prevent the limit bolt 9 from being wind-eroded or becoming brittle at low temperatures, thereby extending the service life of the limit bolt 9 and ensuring that the limit bolt 9 is firmly fixed to the plug block 6.

[0034] Preferably, the fixing frame 3 is provided with an elastic limiting device, and the elastic limiting device includes a mounting shell 14 respectively arranged on the top of the three fixing frames 3, and the top of the mounting shell 14 is provided with a limiting pin 15 that passes through the mounting shell 14 and the top of the fixing frame 3 respectively, and the mounting block 4 is provided with a limiting hole 16 that is plugged with the limiting pin 15, and the part of the limiting pin 15 located in the mounting shell 14 is provided with a limiting block 17, and the limiting pin 15 is covered with a spring 18, and the spring 18 is located between the top of the limiting block 17 and the top of the mounting shell 14, and the lifting Limit pin 15, pull the bottom end of limit pin 15 out of fixed frame 3, now can insert mounting block 4 into fixed frame 3, after mounting block 4 is slid into place, limit hole 16 is just located at the bottom of limit pin 15, now release limit pin 15, make limit pin 15 and limit hole 16 plug, prevent mounting block 4 from moving after being installed in place, and under the pushing action of spring 18, make limit pin 15 firmly inserted in limit hole 16, ensure the stability of mounting block 4 after plugging and installing, thereby further ensure the stability of overall structure.

[0035] Preferably, the limiting bolts 9 are respectively threadedly connected to the three inserting blocks 6, further improving the limiting effect of the limiting bolts 9 on the inserting blocks 6 and better ensuring the stability of the fixed connection between the inserting blocks 6 and the positioning rods 5.

[0036] This patent can fix three mounting blocks 4 and three blades 2 at the same time, thereby realizing rapid assembly and fixation of the blades 2. The operation is simple and convenient, the installation is fast and labor-saving, and the practicality is better.

Claims

1. A plasma surface treated wind turbine blade comprising a hub (1) and three plasma surface treated blades (2), characterized in that: The front end surface of the wheel hub (1) is provided with three fixed frames (3) in a circular array, and the three fixed frames (3) are all slidably plugged with mounting blocks (4). A positioning rod (5) is provided in the middle of the front end surface of the wheel hub (1), and the mounting blocks (4) are respectively provided with plug blocks (6) at one end close to the positioning rod (5). The three plug blocks (6) have different heights. The outer periphery of the positioning rod (5) is respectively provided with slots (7) corresponding to the three plug blocks (6), and the plug blocks (6) are respectively plugged into the corresponding slots (7). The top end of the positioning rod (5) is provided with a socket (8) respectively passing through the positioning rod (5) and the three plug blocks (6). The socket (8) is internally threaded with a limiting bolt (9), and the limiting bolt (9) also passes through the three plug blocks (6). The blades (2) are respectively connected to the end of the mounting block (4) away from the positioning rod (5).

2. The wind turbine blade treated with plasma surface treatment according to claim 1, characterized in that: The three mounting blocks (4) are each provided with an arc-shaped groove (10), and the inner thread of the arc-shaped groove (10) is connected to a limiting ring (11).

3. The wind turbine blade treated with plasma surface treatment according to claim 2, characterized in that: A rocker (12) is provided on the limiting ring (11).

4. The wind turbine blade treated with plasma surface treatment according to claim 1, characterized in that: The top end of the positioning rod (5) is threadedly connected with a sealing cover (13).

5. The wind turbine blade treated with plasma surface treatment according to claim 1, characterized in that: An elastic limiting device is provided on the fixing frame (3).

6. The wind turbine blade subjected to plasma surface treatment according to claim 5, characterized in that: The elastic limiting device comprises a mounting shell (14) respectively arranged on the top of the three fixed frames (3); the top of the mounting shell (14) is provided with a limiting pin (15) which respectively passes through the mounting shell (14) and the top of the fixed frame (3); the mounting block (4) is provided with a limiting hole (16) which is plugged into the limiting pin (15); the portion of the limiting pin (15) located in the mounting shell (14) is provided with a limiting block (17); the limiting pin (15) is covered with a spring (18); and the spring (18) is located between the top of the limiting block (17) and the top of the mounting shell (14).

7. The wind turbine blade subjected to plasma surface treatment according to claim 1, characterized in that: The limiting bolts (9) are respectively threadedly connected to the three insert blocks (6).

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