JP2010281297A - Wind power generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wind power generator having a housing improved in the utilization efficiency of wind energy by reducing drag caused by turbulent flows and increasing wind pressure. <P>SOLUTION: The wind power generator includes: a housing comprising a housing end, a housing body in which one end is formed in a diameter-reduced portion, the other end is formed in a diameter-enlarged portion and which is formed with a saddle-shaped portion having a valley at a part where a diameter-reduced portion and a diameter-enlarged portion contact with each other; a power generator set provided in the housing, having a drive shaft and generating electric energy by rotating the drive shaft; and a blade hub having a hub which is radially provided with a plurality of blades formed with downwash parts at ends, and connected to an end of the drive shaft. The downwash parts are formed at the ends of the blades and form recesses on wind receiving faces and/or back faces of the blades. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a wind power generator.

  In recent years, research has been focused on alternative energy or new energy. There are various types of energy that are always seen as alternative energy, from solar energy, wind energy, tidal energy, to biomass energy. These seek to convert the uninterrupted energy of nature into various usable energies.

  Of the natural energy mentioned above, wind energy is relatively easy to apply and will not be depleted. The generation of wind is due to convective motion caused by the effect of heat in the atmosphere.

  A wind power generator generally uses the wind current to affect the efficiency of use of the generator's motorgie. It also affects the usage efficiency of ghee. In addition, the design of the structure such as the shape and number of blades, for example, also affects the efficiency of using wind energy.

Wind generators are broadly classified into two types: upwind type and downwind type, depending on the direction of wind. A common wind generator is an up-wind type, in which an air current caused by wind strikes the blade directly from the front of the blade hub and rotates it, from which wind energy is converted into electrical energy. In this case, the surface of the blade hub that faces the wind must be accurately directed to the direction in which the wind blows. Otherwise, the windmill cannot exert its maximum effect. Therefore, most wind power generators are equipped with a device that allows the windmill, such as a yaw gear, to automatically face the direction of the wind, for example, by automatically detecting the wind direction and rotating the windmill with a power unit. Change the direction to obtain favorable wind utilization efficiency. Such a wind power generator not only has a complicated structure, but also has a low manufacturing cost.

  The blade hub of the downwind type wind power generator is provided behind the housing. Moreover, a support shaft is provided off the axis passing through the center of the housing. Therefore, the center point and the fulcrum of rotation do not share the position. When the blade rotates by receiving wind, the airflow moves toward the nose of the housing, and a moment arm is formed by the distance between the blade and the fulcrum of the housing. The effect of automatically detecting the wind direction is born.

Further, the wind power generator 10 is rotatably provided on the support column 20 as disclosed in FIG. 1, whether it is a downwind type or an upwind type. The wind power generator 10 includes a housing 11, a generator set 12, and a blade hub 13.

The housing 11 has a streamlined shape similar to a warhead. That is, the diameter gradually increases from the front end of the housing 11 toward the central portion, and gradually decreases from the central portion toward the rear end. Therefore, when the airflow is blown from the front end of the housing 11 as disclosed by arrows in the drawing, the airflow is first diffused outward. A part of the airflow reaches the central portion of the housing 11 and contracts inside. Any of the airflow that contracts inward when diffused outwardly hits the blade hub 13 to generate turbulent flow.

The blade hub 13 is provided with a plurality of blades 121. For this reason, a vertical drag is generated by being pushed by the wind pressure, and the blade hub rotates to convert the wind energy into electric energy. However, when the air current reaches the end of the blade 11, a vortex and a wind noise are generated. The end of the blade 131 is a position where the maximum torque is generated when the blade hub 13 rotates. The tip vortex generated at the end of the blade 131 generates a force that moves the blade 13 in the opposite direction. Therefore, a force that conflicts with the rotation of the blade hub 13 is generated. Therefore, whether it is a housing design or a blade design, it affects the utilization efficiency of the wind power generator with respect to the wind energy, and also greatly affects the power generation efficiency.

The present invention is characterized by providing a wind power generator having a housing capable of reducing drag caused by turbulent flow and increasing wind pressure to increase the use efficiency of wind energy.

The present invention also provides a wind power generator having a housing having an effect of automatically detecting a wind direction.

In addition, the present invention provides a wind power generator that can suppress the generation of tip vortices in a blade and the generation of wind noise when the blade hub rotates, thereby enhancing the effect of using wind energy. Let it be an issue.

Therefore, the present inventor forms a housing tip, a hook-shaped portion having one end as a reduced diameter portion, the other end as a diameter expanded portion, and a valley portion as a portion where the diameter reduced portion and the diameter expanded portion are in contact with each other. A housing body comprising:
A generator set that is provided in the housing and includes a drive shaft, and generates electric energy by rotating the drive shaft;
A wind turbine generator comprising: a blade hub radially provided with a plurality of blades each having a down wash end formed on its outer peripheral surface, and a blade hub connected to one end of the drive shaft; Focusing on the point that the problem can be solved by the structure of the wind power generator in which a down wash is formed at the end of the blade and the concave portion is formed on the wind receiving surface and / or the back surface of the blade, and the present invention is based on such knowledge Was completed.

The present invention will be specifically described below.
The wind power generator according to claim 1 has a housing front end portion, one end being a reduced diameter portion, the other end being a diameter enlarged portion, and a portion where the reduced diameter portion and the diameter enlarged portion are in contact with each other. A housing body formed with a housing, and a housing,
A generator set that is provided in the housing and includes a drive shaft, and generates electric energy by rotating the drive shaft;
A blade hub provided on the outer peripheral surface with a hub in which a plurality of blades having a down wash at the end are provided in a radial pattern and connected to one end of the drive shaft.

According to a second aspect of the present invention, at least one fin is provided in the bowl-shaped portion in the first aspect so as to be parallel to the axis of the housing body.

The wind power generator according to claim 3 is an angle formed between the down wash and the blade, wherein the down wash direction in claim 1 is opposite to the wind receiving surface of the blade. Is equal to 90 degrees or greater than 90 degrees.

The wind power generator described in claim 4 has a plurality of concave portions that are hemispherical on the wind receiving surface of the blade in claim 1.

The wind power generator according to claim 5 is formed with a plurality of concave portions having a hemispherical shape on both the wind receiving surface and the back surface of the blade in claim 1.

  According to the present invention, the drag due to turbulence can be reduced, the wind pressure can be increased to increase the use efficiency of wind energy, and the advantage of increasing the use efficiency of wind energy is obtained.

In addition, the present invention has the effect of automatically detecting the wind direction, suppresses the generation of tip vortices in the blade and the generation of wind noise when the blade hub rotates, and extends the service life. It has the advantage of having both convenience and practicality.

It is explanatory drawing which showed the airflow in the conventional wind power generator. It is the exploded view which showed the structure of the wind power generator by this invention. 1 is a side view showing a wind power generator according to the present invention. It is explanatory drawing which showed the airflow in the wind power generator of this invention. It is a local expansion explanatory view showing the tip of a blade and airflow in this invention. It is explanatory drawing which showed the operation | movement which detects the wind direction of the wind power generator by this invention.

    As disclosed in FIGS. 2 and 3, the wind power generator according to the present invention includes a housing 30, a generator set 40, and a blade hub 50.

The housing 30 includes a housing front end portion 31 and a housing main body 32. A fixed seat 311 is provided below the housing tip 31. A plurality of concave grooves 312 are formed on the outer peripheral surface of the housing tip 31. In addition, at least one attachment hole 313 is formed in each concave groove 312.

  The housing body 32 has a hollow cylindrical shape and has a storage space 321 inside. Further, a fixing hole 322 is formed at a position corresponding to the mounting hole 313 formed in the housing front end portion 31, and a fastening member such as a screw is passed through the mounting hole 313 and the fixing hole 322 so that the housing main body 32 and the housing front end portion are inserted. 31 is connected.

In addition, on the outer peripheral surface of the housing main body 32, a hook-shaped portion 323 that is constricted by drawing an arc line is formed. That is, the housing body 32 is formed with a reduced diameter portion 3231 that decreases in diameter from one end on the housing front end portion 31 side toward the central portion, and a large diameter portion 3232 that increases in diameter from the central portion to one end on the blade hub side, A valley portion 3233 is formed at a position where the reduced diameter portion 3231 and the enlarged diameter portion 3232 are in contact with each other.

The angle of the arc line of the reduced diameter portion 3231 is smaller than or equal to the angle of the arc line of the enlarged diameter portion 3232, and the length of the arc line of the reduced diameter portion 3231 is shorter than the angle of the arc line of the enlarged diameter portion 3232. Or equal. In addition, fins 324 are provided in the bowl-shaped portion 323. The fins 324 are provided along the direction of the axis of the housing body, and are provided so as to protrude from the surface of the housing body 32.

The generator set 40 is provided in the housing main body 32. A hub 51 is provided at the center of the generator set 40. A plurality of blades 52 are provided radially on the outer periphery of the hub 51. A shaft hole 511 is formed in the center of the hub 51, and the end of the drive shaft 41 is attached to and connected to the shaft hole 51 to serve for rotation of the hub 51.

Each grade 52 includes a wind receiving surface 521 and a back surface 522 and forms a down wash 543 at the end. The direction in which the downwash 543 curves is opposite to the wind receiving surface 421, and the angle formed between the downwash 543 and the blade 52 is equal to or greater than 90 degrees.

In addition, a plurality of concave portions 53 are formed on the wind receiving surface 421 of the blade 52, or a plurality of concave portions 43 are formed on both the wind receiving surface 521 and the back surface 522. The concave portion 53 has a hemispherical shape and has an aspect like a spherical surface of a golf ball.

When assembling the wind power generator having the above configuration, the fixed seat 411 below the front end portion 31 of the housing is provided on the support column 60, and the housing 30 is provided on the support column 60 so as to be rotatable. Moreover, when the blade hub 50 receives wind and rotates, the generator set 40 is interlocked to generate electrical energy.

As shown in FIGS. 2 and 4, when a high-speed rapid stream hits the wind power generator according to the present invention (the direction of the airflow is indicated by an arrow in the drawing), the airflow blows from the direction of the housing tip 31, and the housing body 32 reaches the reduced diameter portion 323 and a vacuum effect is generated to suck the airflow. When the airflow reaches from the valley portion 3233 of the bowl-shaped portion 323 to the enlarged diameter portion 3232, the rising angle of the airflow blown out by the enlarged diameter portion 3232 is improved.

The speed at which the airflow flows, the distance to be stretched, and the rising angle after the airflow is blown out change depending on the design of the arc line angle and the arc line length between the reduced diameter part 323 and the enlarged diameter part 3232 of the bowl-shaped part 323. Then, the airflow directly hits the maximum wind receiving area portion of the blade 50 or the outermost end, and the maximum torque is generated.

Therefore, the wind power generator according to the present invention reduces the resistance force generated by the turbulent flow found in the prior art, and concentrates the airflow after blowing out and blows it to the portion of the blade 50 having the maximum wind receiving area. it can. For this reason, the effect of wind pressure can be increased, and the utilization efficiency of wind energy when performing wind power generation can be greatly increased. Experiments have demonstrated that wind energy utilization efficiency can certainly be increased under similar wind speed conditions. This is a major technological breakthrough for wind power technology.

As shown in FIGS. 2 and 5, when the wind receiving surface 521 of the blade 52 in the present invention receives an air flow (the direction of the air flow is indicated by an arrow in the drawing), the blade hub 50 is rotated to generate electric energy. To do. In the present invention, the down wash 523 at the end of the blade 42 prevents the air flow that may form the tip vortex beyond the blade 42 and blows it directly backward, thereby greatly reducing the generation of the tip vortex. Can be made.

Experiments have demonstrated that the generation efficiency of the blade tip offsets at least about 1% of power generation efficiency. The design of the down wash 523 in the present invention is a kind of system that can recover the offset energy loss and relatively increase the efficiency of wind power generation. Further, the blade tip vortex at the end of the blade 52 also causes wind noise. Therefore, naturally, the generation of wind noise is reduced.

Further, a concave portion 53 similar to the spherical surface of a golf ball is formed on the surface of the blade 52 in the present invention. This has the effect of increasing the ascending force and increasing the flow rate of the wind, as with the principle when the golf ball flies. Therefore, the generation of turbulence and wind noise can be efficiently reduced, the air volume and the flow direction can be concentrated, the generation of dust can be reduced, the service life of the blade hub 50 can be extended, and the volume generated at the same time can be reduced. Can be reduced.

Further, as disclosed in FIGS. 2 and 6, the fins 324 provided in the flange-shaped portion 323 formed in the housing 30 are provided in parallel with the direction of the airflow (disclosed by arrows in the drawings). Therefore, the airflow can be prevented when the airflow rises and blows out. For this reason, the effect of rectification | straightening is acquired by providing the fin 324. FIG.

Furthermore, when the direction of the airflow changes, the fins 324 deflect the angle in the direction of the airflow. For this reason, the effect | action which rotates the housing 30 and deviates direction with the force which airflow advances along the direction of the fin 324 generate | occur | produces. For this reason, the blade hub 50 can always hold the direction in the direction in which the airflow flows. This is also one of the features of the present invention.

The wind power generator of the present invention having the above-described configuration has the following characteristics.
1,
The design in which the housing 30 has a concave portion that draws a circular arc and has a streamline shape is characterized in that when a high-speed air current is blown, the effect of rectification and wind pressure increase is generated, and the rising angle is raised when the air flow blows out. Have. Therefore, when performing wind power generation, the utilization efficiency of wind energy can be improved significantly.
2,
Further, a down wash 423 is formed at the end of the blade 52. For this reason, generation | occurrence | production of a wing-tip vortex | eddy_current can be reduced and the effect of wind power generation can be improved significantly.
3,
By providing at least one or more fins 324 in the bowl-shaped portion 323, it can always be held in the direction in which the air current blows. Therefore, the effect of automatically detecting the direction of the wind can be obtained.
4,
By forming a plurality of concave portions 53 having an aspect similar to the spherical surface of the golf ball on the surface of the blade 52, it is possible to reduce the resistance of air, reduce the occurrence of turbulence and wind noise, By concentrating the direction and reducing the generation of dust, it is possible to extend the service life of the blade hub 50 and realize a quiet wind power generator that generates noise and is difficult to die.

The above is a preferred embodiment of the present invention, and does not limit the scope of the present invention. Therefore, changes, modifications, etc. that can be made by those skilled in the art, which are made within the spirit of the present invention and have an equivalent effect on the present invention, such as the shape of the housing, the setting of the angle of the down wash, the shape Any changes, modifications, etc. of the size, the shape of the concave portion of the blade surface, the interval, etc. shall belong to the scope of the utility model registration claim of the present invention.

30 Housing 31 Housing tip 311 Fixing seat 312 Recess groove 313 Mounting hole 32 Housing body 321 Storage space 322 Fixing hole 323 Gutter-shaped portion 3231 Reduced diameter portion 3232 Expanded diameter portion 3233 Valley portion 324 Fin 40 Generator set 41 Drive shaft 50 Blade Hub 51 Hub 511 Shaft hole 52 Blade 521 Wind receiving surface 522 Back surface 523 Down wash 53 Concave portion 60 Support pillar

Claims (5)

A housing main body having a housing tip formed with a housing tip formed with one end serving as a reduced diameter portion, the other end serving as an enlarged diameter portion, and a trough portion having a portion where the reduced diameter portion and the enlarged diameter portion are in contact with each other; A housing
A generator set that is provided in the housing and includes a drive shaft, and generates electric energy by rotating the drive shaft;
A wind power generator comprising: a blade hub radially provided with a plurality of blades each having a down wash formed on an outer peripheral surface, and a blade hub connected to one end of the drive shaft. The wind power generator according to claim 1, wherein at least one fin is provided in the bowl-shaped portion so as to be parallel to an axis of the housing body. The bending direction of the down wash is opposite to the wind receiving surface of the blade, and the angle formed between the down wash and the blade is equal to or greater than 90 degrees. The wind power generator according to claim 1. The wind power generator according to claim 1, wherein a plurality of concave portions having a hemispherical shape are formed on the wind receiving surface of the blade. 2. The wind power generator according to claim 1, wherein a plurality of concave portions having a hemispherical shape are formed on both the wind receiving surface and the back surface of the blade.

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