Wind driven generator blade with noise reduction structure

Abstract

The utility model discloses a wind driven generator blade with a noise reduction structure, which comprises a fixed base and a fixed column fixed on the fixed base, the fixed base is rotatably connected with a generator cabin through the fixed column, and the side surface of the generator cabin is rotatably connected with a blade hub. Three blades are rotationally connected into the blade hub through a rotating shaft, each blade comprises a blade shell, a rail groove is formed in the side face of each blade shell, and a set of air knives are movably connected into each rail groove; by means of the equipment, air flow can be disturbed and adjusted, energy of turbulent flow and vortex can be reduced, therefore, generation of aerodynamic noise is reduced, meanwhile, the operation efficiency and environment friendliness of the wind driven generator can be improved, the effect of pre-starting of the blades can be achieved, it is ensured that wind energy is safely and efficiently utilized for power generation, and the wind power generation efficiency is improved. And meanwhile, the blade tip cover which is easy to damage can be quickly replaced, so that the whole blade is prevented from being replaced.

Description

Technical Field

[0001] The utility model relates to the technical field of XX, in particular to a wind turbine blade with a noise reduction structure. Background Art

[0002] The design of the blades in a wind turbine directly affects the conversion efficiency of wind energy and its annual power generation, and is an important part of wind energy utilization. The blades are the most basic and critical components of a wind turbine. Their good design, reliable quality and superior performance are the decisive factors in ensuring the normal and stable operation of the unit.

[0003] Patent application number "CN202321750106.4" describes "a sound-absorbing, exhaust and noise reduction device for the tower of a wind turbine generator set, which relates to the technical field of tower noise reduction. The blades of the blinds are limited and blocked, so that the position of the blades can be positioned, and the wind force of the fan blowing on the blades of the blinds is reduced to a certain extent, avoiding excessive collision noise between the blades and the blinds, and realizing the noise reduction function through two sound-absorbing and noise reduction methods and the noise reduction device of the blinds."

[0004] However, the above-mentioned equipment only reduces the noise of the generator set inside the wind turbine, and does not reduce the noise generated by the rotation of the blades cutting the air. In general, aerodynamic noise may dominate, resulting in the above-mentioned equipment having an insignificant noise reduction effect.

[0005] To this end, the utility model provides a wind turbine blade with a noise reduction structure to solve the above problems. Utility Model Content

[0006] In view of the deficiencies of the prior art, the utility model provides a wind turbine blade with a noise reduction structure, which solves the above-mentioned problem that the noise generated by the blade rotating and cutting the air is not reduced.

[0007] To achieve the above objectives, the utility model is implemented through the following technical solutions: a wind turbine blade with a noise reduction structure, comprising a fixed base and a fixed column fixed on the fixed base, the fixed base is rotatably connected to a generator cabin through the fixed column, and the side of the generator cabin is rotatably connected to a blade hub, the interior of the blade hub is rotatably connected to three blades through a rotating shaft, the blade comprises a blade shell, a track groove is provided on the side of the blade shell, and a group of wind knives are movably connected inside the track groove, a movable groove matching the end of the wind knife is provided on the inner wall of the side of the blade shell, and a limit assembly for easy resetting is fixedly connected between the movable groove and the end of the wind knife.

[0008] Preferably, a wind speed detector for detecting wind force is fixedly connected to the fixed base, and the wind speed detector is electrically connected to the internal generator of the generator cabin.

[0009] Preferably: the end of the blade shell is detachably connected to the blade tip cover by means of a lock and a buckle, and the blade shell and the blade tip cover are fixedly connected with a pair of locks and buckles, and the locks and buckles are respectively arranged on the opposite sides of the blade shell and the blade tip cover. And placement grooves matching the locks and buckles are opened at corresponding positions of the blade shell and the blade tip cover.

[0010] Preferably: a pair of propulsion fans for pushing the blade tip cover are fixedly connected at the center position of the blade tip cover, and a matching circular groove is opened on the blade tip cover, and a fixing rod for fixing the propulsion fan is fixedly connected to the circular groove inside the blade tip cover.

[0011] Preferably, a lightning rod for facilitating conduction is fixedly connected to the end position of the blade tip cover, and the lightning rod is connected to the ground through a wire.

[0012] Preferably, the lock and the buckle are fixedly connected by a fixing bolt, and insulating rubber is fixedly connected at the contact surface between the blade tip cover and the blade shell.

[0013] The utility model provides a wind turbine blade with a noise reduction structure. Compared with the prior art, it has the following beneficial effects:

[0014] (1) The wind turbine blade with a noise reduction structure rotates the blade shell to a suitable angle by controlling the rotating shaft. During the rotation of the blade shell, the wind knife inside the track groove is ejected outward under the action of centrifugal force, thereby forming a sawtooth structure on the outside of the blade shell. The air flow is then disturbed and adjusted, the energy of turbulence and eddy current is reduced, thereby reducing the generation of aerodynamic noise, and at the same time, the operating efficiency and environmental friendliness of the wind turbine can be improved.

[0015] (2) When the blade shell of the wind turbine generator blade with a noise reduction structure is adjusted to a suitable wind angle, the propulsion fan on the blade tip cover can receive wind energy first and assist in pushing the blade shell to rotate, thereby achieving a pre-start effect on the blade to ensure safe and efficient use of wind energy for power generation. At the same time, through the locking and snap-on disassembly connection method, the easily damaged blade tip cover can be quickly replaced, thereby avoiding the need to replace the entire blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional diagram of the external structure of the utility model;

[0017] Figure 2 It is a three-dimensional diagram of the blade hub and the external structure of the blade of the utility model;

[0018] Figure 3 It is a three-dimensional diagram of the external structure of the blade of the utility model;

[0019] Figure 4 It is a cross-sectional stereoscopic view of the blade shell and blade tip cover structure of the utility model.

[0020] In the figure, 1, fixed base; 2, fixed column; 3, generator compartment; 4, wind speed detector; 5, blade hub; 6, blade; 61, blade housing; 62, rotating shaft; 63, wind knife; 64, blade tip cover; 65, lock; 66, buckle; 67, propulsion fan; 68, track groove; 69, lightning rod. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Embodiment 1:

[0023] See also Figures 1 to 4A wind turbine blade with a noise reduction structure comprises a fixed base 1 and a fixed column 2 fixed on the fixed base 1, the fixed base 1 is rotatably connected to a generator cabin 3 through the fixed column 2, and a blade hub 5 is rotatably connected to the side of the generator cabin 3, and three blades 6 are rotatably connected to the inside of the blade hub 5 through a rotating shaft 62, the blade 6 comprises a blade shell 61, a track groove 68 is provided on the side of the blade shell 61, and a group of wind knives 63 are movably connected inside the track groove 68, and an active groove matching the end of the wind knife 63 is provided on the inner wall of the side of the blade shell 61, and a limit assembly for easy reset is fixedly connected between the active groove and the end of the wind knife 63, a wind speed detector 4 for easy detection of wind force is fixedly connected to the fixed base 1, and the wind speed detector 4 is electrically connected to the internal generator of the generator cabin 3, the wind force is detected by the wind speed detector 4, and the data is transmitted to the generator inside the generator cabin 3, so as to The control shaft 62 rotates the blade shell 61 to a suitable angle. When the adjustment is completed, the blade hub 5 will drive the three blade shells 61 to rotate under the action of wind force, and the wind energy is converted into electrical energy through the action of the differential gear and the generator inside the generator compartment 3. At the same time, during the rotation of the blade shell 61, the wind knife 63 inside the track groove 68 is ejected outward under the action of centrifugal force, thereby forming a sawtooth structure on the outside of the blade shell 61, and then by interfering with and regulating the air flow, the energy of turbulence and eddy current is reduced, thereby reducing the generation of aerodynamic noise, and at the same time, it can improve the operating efficiency and environmental friendliness of the wind turbine. In addition, due to the limit assembly fixedly connected between the movable groove inside the track groove 68 and the end of the wind knife 63, when the blade shell 61 stops rotating, the wind knife 63 can be retracted into the inside of the blade shell 61, thereby avoiding environmental erosion of the wind knife 63 and reducing the service life of the equipment.

[0024] Embodiment 2:

[0025] See also Figures 1 to 4, this embodiment provides a technical solution based on the first embodiment: the end of the blade shell 61 is detachably connected to the blade tip cover 64 through a lock 65 and a buckle 66, and a pair of locks 65 and buckles 66 are fixedly connected to the blade shell 61 and the blade tip cover 64, and the locks 65 and buckles 66 are respectively arranged on the opposite sides of the blade shell 61 and the blade tip cover 64. And the corresponding positions of the blade shell 61 and the blade tip cover 64 are provided with placement grooves matching the locks 65 and the buckles 66, a pair of propulsion fans 67 for pushing the blade tip cover 64 are fixedly connected at the center position of the blade tip cover 64, and a circular groove matching therewith is provided on the blade tip cover 64, and a fixing rod for fixing the propulsion fan 67 is fixedly connected to the circular groove inside the blade tip cover 64, and a lightning rod 69 for conducting electricity is fixedly connected to the end position of the blade tip cover 64, and the lightning rod 69 is connected to the lightning rod 69 through a wire. The blade tip cover 64 is connected to the ground, the lock 65 and the buckle 66 are fixedly connected by fixing bolts, and insulating rubber is fixedly connected to the contact surface of the blade tip cover 64 and the blade shell 61. When the blade shell 61 is adjusted to a suitable wind angle, the propulsion fan 67 on the blade tip cover 64 can receive wind energy first and can assist in pushing the blade shell 61 to rotate, thereby achieving a pre-start effect on the blades to ensure safe and efficient use of wind energy for power generation. At the same time, the lock 65 and the buckle 66 are disassembled and connected, so that the easily damaged blade tip cover 64 can be quickly replaced, so as to avoid replacing the entire blade, which leads to reduced economic benefits and property losses. In addition, a lightning rod 69 is fixedly connected to the front end of the blade tip cover 64 to guide lightning from the tip of the blade tip cover 64 to the ground in thunderstorm weather, thereby achieving the purpose of further protecting the equipment.

[0026] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0027] Working principle: When working, firstly, the wind speed is detected by the wind speed detector 4 (this structure is the same as the wind vane, which is a common prior art in this field and will not be elaborated here), so as to transmit the data to the generator inside the generator compartment 3, so as to control the rotating shaft 62 to rotate the blade shell 61 to a suitable angle. When the adjustment is completed, under the action of the wind force, the blade hub 5 will drive the three blade shells 61 to rotate, and the wind energy is converted into electrical energy through the action of the differential gear and the generator inside the generator compartment 3. At the same time, during the rotation of the blade shell 61, the wind knife 63 inside the track groove 68 is ejected outward under the action of centrifugal force, so as to form a sawtooth structure on the outside of the blade shell 61, and then by interfering with and regulating the air flow, the energy of turbulence and eddy current is reduced, thereby reducing the generation of aerodynamic noise, and at the same time, it can improve the operating efficiency and environmental friendliness of the wind turbine. In addition, due to the movable groove inside the track groove 68 and the end of the wind knife 63, The limit assembly fixedly connected between the blade shell 61 and the blade shell 61 allows the wind knife 63 to be retracted into the interior of the blade shell 61 when the blade shell 61 stops rotating, thereby avoiding environmental erosion of the wind knife 63 and reducing the service life of the equipment, and when the blade shell 61 is adjusted to a suitable wind angle, the propulsion fan 67 on the blade tip cover 64 can receive wind energy first and assist in pushing the blade shell 61 to rotate, thereby achieving a pre-start effect on the blades to ensure safe and efficient use of wind energy for power generation, and at the same time, through the disassembly connection method of the lock 65 and the buckle 66, the easily damaged blade tip cover 64 can be quickly replaced, so as to avoid replacing the entire blade, which leads to reduced economic benefits and property losses, and the front end of the blade tip cover 64 is fixedly connected with a lightning rod 69, so as to guide lightning from the tip of the blade tip cover 64 to the ground in thunderstorm weather, thereby achieving the purpose of further protecting the equipment.

[0028] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wind turbine blade with a noise reduction structure, comprising a fixed base (1) and a fixed column (2) fixed on the fixed base (1), characterized in that: The fixed base (1) is rotatably connected to the generator cabin (3) via a fixed column (2), and a blade hub (5) is rotatably connected to the side of the generator cabin (3), and three blades (6) are rotatably connected to the inside of the blade hub (5) via a rotating shaft (62), and the blades (6) include a blade shell (61), a track groove (68) is provided on the side of the blade shell (61), and a group of wind knives (63) are movably connected inside the track groove (68), and a movable groove matching the end of the wind knife (63) is provided on the inner wall of the side of the blade shell (61), and a limit assembly for easy resetting is fixedly connected between the movable groove and the end of the wind knife (63).

2. The wind turbine blade with a noise reduction structure according to claim 1, characterized in that: The fixed base (1) is fixedly connected with a wind speed detector (4) for detecting the wind force, and the wind speed detector (4) is electrically connected to the internal generator of the generator cabin (3).

3. The wind turbine blade with a noise reduction structure according to claim 1, characterized in that: The end of the blade shell (61) is detachably connected to a blade tip cover (64) via a latch (65) and a buckle (66), and a pair of latches (65) and buckles (66) are fixedly connected to the blade shell (61) and the blade tip cover (64), and the latches (65) and buckles (66) are respectively arranged on opposite sides of the blade shell (61) and the blade tip cover (64). In addition, corresponding positions of the blade shell (61) and the blade tip cover (64) are provided with placement grooves matching the latches (65) and buckles (66).

4. The wind turbine blade with a noise reduction structure according to claim 3, characterized in that: A pair of propulsion fans (67) for pushing the blade tip cover (64) are fixedly connected at the center of the blade tip cover (64), and a circular groove matching the blade tip cover (64) is provided on the blade tip cover (64). A fixing rod for fixing the propulsion fan (67) is fixedly connected to the circular groove inside the blade tip cover (64).

5. The wind turbine blade with a noise reduction structure according to claim 3, characterized in that: A lightning rod (69) for conducting electricity is fixedly connected to the end of the blade tip cover (64), and the lightning rod (69) is connected to the ground through a wire.

6. The wind turbine blade with a noise reduction structure according to claim 3, characterized in that: The latch (65) and the buckle (66) are fixedly connected via fixing bolts, and insulating rubber is fixedly connected at the contact surface between the blade tip cover (64) and the blade shell (61).

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