An automatic tip lifting and releasing device for a fixed pitch wind turbine generator

Abstract

The present invention discloses a tip automatic lifting and releasing device for a fixed pitch wind turbine generator, which comprises a lifting device housing. A slideway is arranged inside the lifting device housing. A driving mechanism is connected to one side of the lifting device housing. The driving mechanism includes a driving motor and a driving gearbox. The output end of the driving mechanism is connected with a worm. A rack is meshed with the worm. The rack is located inside the slideway. An electromagnetic rotator is connected to the lower part of the lifting device housing. An oscillating arm is connected to the electromagnetic rotator. A limit rack is connected to the oscillating arm. The limit rack is meshed and connected with a gear outside the bottom of the driving gearbox. A return spring is connected between the lifting device housing and the driving mechanism. Compared with the prior art, the advantages of the present invention are as follows: novel structure, reasonable design, convenient maintenance, high reliability and high safety.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and particularly to a tip automatic lifting and releasing device for a fixed pitch wind turbine generator set. Background Art

[0002] A wind turbine generator is a power device that converts wind energy into mechanical work. The mechanical work drives the rotor to rotate, and finally outputs alternating current. Fixed pitch means that the blades of the wind wheel are rigidly connected to the hub, and the pitch angle of the blades remains unchanged. The principle of fixed pitch stall power regulation is that the blade angle of the wind turbine is fixed, and the aerodynamic characteristics of the blade itself are utilized. That is, within the rated wind speed, the lift coefficient of the blade is relatively high, and the wind energy utilization coefficient (Cp value) is also relatively high. When the wind speed exceeds the rated value, the blade enters the stall state, resulting in no further increase in lift, and the rotational speed of the wind wheel will not increase with the increase of the wind speed, thus achieving the purpose of limiting the power of the wind turbine. A wind turbine generator generally consists of components such as a wind wheel, a generator (including devices), a yaw regulator (tail fin), a tower, a speed limiting safety mechanism, and an energy storage device. The working principle of a wind turbine generator is relatively simple. The wind wheel rotates under the action of wind force, converting the kinetic energy of the wind into the mechanical energy of the wind wheel shaft, and the generator rotates to generate electricity driven by the wind wheel shaft.

[0003] When a fixed pitch wind turbine generator set stops, the tips of the blades need to be thrown out for air braking in cooperation with mechanical braking to stop. Currently, when a fixed pitch wind turbine generator set stops, the tip throwing is driven by a hydraulic cylinder. The driving medium of hydraulic drive is easily affected by temperature, thus affecting the system pressure, leakage of connecting pipelines and hydraulic cylinders, resulting in leakage of hydraulic medium. The leaked hydraulic medium corrodes the blade body and damages the blade structure. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the above technical problems and provide a tip automatic lifting and releasing device for a fixed pitch wind turbine generator set with novel structure, reasonable design, convenient maintenance, high reliability and high safety.

[0005] To solve the above technical problems, the technical solution provided by the present invention is as follows: A tip automatic lifting and releasing device for a fixed pitch wind turbine generator set, including a lifting device housing, a buffer block is connected above the lifting device housing, a buffer spring is connected between the buffer block and the lifting device housing, a slideway is arranged inside the lifting device housing, a driving mechanism is connected to one side of the lifting device housing, the driving mechanism includes a driving motor and a driving gearbox, an output end of the driving mechanism is connected with a worm, a rack is engaged with the worm, the rack is located in the slideway, the driving motor is connected to the driving gearbox below, guide bars are connected to both the upper and lower parts of the driving gearbox, a guide groove for cooperating with the guide bars is arranged on the lifting device housing, an electromagnetic rotator is connected below the lifting device housing, a swing arm is connected to the electromagnetic rotator, a limit rack is connected to the swing arm, the limit rack is meshed and connected with a gear outside the bottom of the driving gearbox, and a return spring is connected between the lifting device housing and the driving mechanism.

[0006] As an improvement, a limit sensor is connected to the lifting device housing, and a limit block is connected to the rack.

[0007] As an improvement, an upper end cover is connected to the lifting device housing.

[0008] As an improvement, the guide bars and the guide groove form a guide rail.

[0009] As an improvement, a limit groove is arranged on the limit rack.

[0010] After adopting the above structure, the present invention has the following advantages: The structure of the present invention is novel and reasonable in design. It adopts a mechanical structure, with high reliability and safety, convenient maintenance, no influence of pressure change, no leakage and corrosion of hydraulic medium, and can protect the safety of blade operation. The buffer spring can effectively reduce the damage to the device and the tip guiding mechanism caused by the impact force during tip release. After the system loses power, the electromagnetic rotator will pull the limit rack, the driving mechanism will be ejected, the rack will be released, and the guide rail has a guiding and limiting function, which is convenient to use and has good practicability. Description of the Drawings

[0011] Figure 1 is a schematic structural diagram of a tip automatic lifting and releasing device for a fixed pitch wind turbine generator set of the present invention.

[0012] Figure 2 is Figure 1 the A-A cross-sectional view in

[0013] Figure 3 is a side view of a tip automatic lifting and releasing device for a fixed pitch wind turbine generator set of the present invention.

[0014] Figure 4 isFigure 3 Schematic diagram of the enlarged structure of part B in

[0015] Figure 5 is Figure 3 Cross-sectional view taken along C-C in

[0016] Figure 6 Schematic diagram of the structure of the limit rack in the tip automatic lifting and releasing device of a fixed-pitch wind turbine of the present invention.

[0017] As shown in the figure: 1. Lifting housing, 2. Buffer block, 3. Buffer spring, 4. Slideway, 5. Driving mechanism, 6. Driving motor, 7. Driving gearbox, 8. Worm, 9. Rack, 10. Guide bar, 11. Guide groove, 12. Electromagnetic rotator, 13. Swing arm, 14. Limit rack, 15. Return spring, 16. Limit sensor, 17. Limit block, 18. Upper end cover, 19. Guide rail, 20. Limit groove. Specific embodiments

[0018] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "center", etc. is based on the orientation or positional relationship shown in the drawings, and 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 structure and operation, so it cannot be understood as a limitation to the present invention.

[0019] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "provided with", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, it can be an electrical connection, it can be directly connected, or it can be 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 situations.

[0020] The present invention will be further described in detail below with reference to the accompanying drawings.

[0021] Combined with the attached Figures 1-6, a tip automatic lifting and releasing device for a fixed pitch wind turbine generator, comprising a lifting device housing 1, a buffer block 2 is connected above the lifting device housing 1, a buffer spring 3 is connected between the buffer block 2 and the lifting device housing 1, a slideway 4 is arranged in the lifting device housing 1, a driving mechanism 5 is connected to one side of the lifting device housing 1, the driving mechanism 5 includes a driving motor 6 and a driving gearbox 7, an output end of the driving mechanism 5 is connected with a worm 8, a rack 9 is engaged with the worm 8, the rack 9 is located in the slideway 4, the driving motor 6 is connected to the driving gearbox 7 below, guide bars 10 are connected to both the upper and lower parts of the driving gearbox 7, a guide groove 11 for cooperating with the guide bar 10 is arranged on the lifting device housing 1, an electromagnetic rotator 12 is connected below the lifting device housing 1, a swing arm 13 is connected to the electromagnetic rotator 12, a limit rack 14 is connected to the swing arm 13, the limit rack 14 is meshed and connected with a gear on the outer bottom of the driving gearbox 7, and a return spring 15 is connected between the lifting device housing 1 and the driving mechanism 5.

[0022] A limit sensor 16 is connected to the lifting device housing 1, a limit block 17 is connected to the rack 9, an upper end cover 18 is connected to the lifting device housing 1, the guide bar 10 and the guide groove 11 form a guide rail 19, and a limit groove 20 is arranged on the limit rack 14.

[0023] In the specific implementation of the present invention, after connecting to an external power supply and the device runs, the electromagnetic rotator 12 and the driving motor 6 act. The swing arm 13 is driven to act by the rotation of the electromagnetic rotator 12. The electromagnetic rotator 12 pulls the limit rack 14 to engage with the lower transmission gear of the driving mechanism 5. The driving mechanism 5 moves forward under the action of the lower transmission gear. After moving to the position of the limit groove 20 of the limit tooth 14, it idles. At this time, the worm 8 is engaged with the rack 9, and the rack 9 moves upward. When the limit block 17 touches the limit sensor 16, the driving motor 6 stops acting, and the lifting of the rack 9 is completed. When the electromagnetic rotator 12 loses power, the limit rack 14 is pulled open, the driving mechanism 5 is ejected by the return spring 15 on the lifting device housing 1, the rack 9 is released, and it is pulled down by the gravity of the blade tip. When the rack 9 descends to a certain position, the buffer block 2 contacts the buffer spring 3 to reduce the impact during the descent of the rack 9. When it descends to the set position, the limit block 17 is stuck to the bottom of the slideway 4, and the release process is completed.

[0024] The above describes the present invention and its implementation manners. Such description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present invention, and the actual structure is not limited thereto. Generally speaking, if those of ordinary skill in the art are inspired by it and without departing from the purpose of the present invention creation, without creative design, structures and embodiments similar to this technical solution are all within the protection scope of the present invention.

Claims

1. An automatic tip lifting and releasing device for a fixed pitch wind turbine generator set, comprising a lifting device housing (1), characterized in that: Above the lifting device housing (1), a buffer block (2) is connected and provided. A buffer spring (3) is connected and provided between the buffer block (2) and the lifting device housing (1). A slideway (4) is provided inside the lifting device housing (1). On one side of the lifting device housing (1), a driving mechanism (5) is connected and provided. The driving mechanism (5) includes a driving motor (6) and a driving gearbox (7). The output end of the driving mechanism (5) is connected and provided with a worm (8). A rack (9) is meshed with the worm (8). The rack (9) is located inside the slideway (4). Below the driving motor (6), it is connected to the driving gearbox (7). Guide bars (10) are connected and provided at both the upper and lower parts of the driving gearbox (7). Guide grooves (11) that cooperate with the guide bars (10) are provided on the lifting device housing (1). Below the lifting device housing (1), an electromagnetic rotator (12) is connected and provided. An oscillating arm (13) is connected to the electromagnetic rotator (12). A limit rack (14) is connected to the oscillating arm (13). The limit rack (14) is meshed and connected with the gear at the outer bottom of the driving gearbox (7). A return spring (15) is connected and provided between the lifting device housing (1) and the driving mechanism (5); A limit sensor (16) is connected and provided on the lifting device housing (1). A limit block (17) is connected and provided on the rack (9); A limit groove (20) is provided on the limit rack (14).

2. The automatic tip lifting and releasing device for a fixed pitch wind turbine generator set according to claim 1, wherein: An upper end cover (18) is connected and provided on the lifting device housing (1).

3. The automatic tip lifting and releasing device for a fixed pitch wind turbine generator set according to claim 1, characterized in that: The guide bars (10) and the guide grooves (11) form a guide rail (19).

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