KR102456995B1 - An impeller and a natural energy power generation device having the same - Google Patents

Abstract

The impeller 18 of the present invention includes a main shaft 22 rotatably installed around the shaft center, and a blade 24 fixed to the main shaft 22 and driven by wind or hydraulic power to rotate around the shaft center. to provide The blade 24 has a straight portion 28 extending in a direction parallel or perpendicular to the main shaft 22 and a blade tip portion 29 extending from an end of the straight portion 28, the blade tip portion (29) is a plurality of stages such that the shape of the cross section cut along the plane including the axial center of the main shaft 22 of the wing tip part 29 is spaced apart from the straight part 28 as it goes from the base end to the front end. It is formed in a curved shape to be spaced apart from the straight part 28 as it goes from the base end to the front end.

Description

An impeller and a natural energy power generation device having the same

This application claims the priority of Japanese Patent Application No. 2015-051593 on March 16, 2015, Japanese Patent Application No. 2015-055735 on March 19, 2015, and Japanese Patent Application No. 2015-055840 on March 19, 2015, The entirety of which is incorporated herein by reference.

The present invention relates to a turbine rotor and a natural energy generator, and while increasing the conversion efficiency of converting wind, hydraulic, or tidal energy received by the blade into rotational energy, the strength of the blade is improved It's about technology.

Windmills and waterwheels of natural energy power generation devices are roughly divided into horizontal axis type and vertical axis type, and the vertical axis type does not require control over the wind direction, flow direction, and current direction, so a relatively small windmill or waterwheel is being used in

In a vertical shaft type windmill or waterwheel for power generation, the shape of the tip of the blade is designed so as to increase the conversion efficiency of converting wind power, hydraulic power, or tidal energy into rotational energy. For example, by inclining the tip of a wing to be close to a vertical main shaft, it becomes possible to efficiently convert energy received from wind, running water, or current into rotational energy. This inclined wing tip is called a winglet. By providing this winglet, a blade tip vortex from a blade tip can be reduced, and it becomes a highly efficient blade (patent document 1).

Japanese Patent No. 4173727 Publication

In the natural energy generator, how efficiently the energy received by the blades can be converted into rotational energy is a very important factor. This conversion efficiency (power factor) is theoretically limited to 16/27 (Betz limit). With respect to this limit value, the conversion efficiency of the current blade is about 0.3 to 0.45, and in order to increase this conversion efficiency, it is necessary to improve the new blade.

Fig. 18A is a front view of a blade 50 of a windmill or waterwheel for vertical axis power generation of a conventional example, and Fig. 18B is a cross-sectional view taken along the line XVIIIB-XVIIIB of Fig. 18A. In the blade 50, when the angle θ between the straight portion 51 and the winglet 52 is set to a predetermined angle or less, a joint 53 connecting these straight portions 51 and the winglet 52. There is a risk of concentration of stress in In this case, it is a matter of the strength of the wing.

If the angle θ of the joint portion 53 is merely increased, the length Lv of the straight portion 51 is shortened since the overall length La of the blade is prescribed according to the size of the windmill or waterwheel. In this case, the conversion efficiency is lowered by a substantial decrease in the water wind area and the receiving water area.

In addition to ensuring the length Lv of the straight part 51, it is also conceivable to enlarge the angle (theta) of the joint part 53. As shown in FIG. Also in this case, since the total length La of the blade 50 is prescribed as described above, the length Lh of the winglet 52 in the horizontal direction is shortened. Then, the effect of reducing the wing edge vortex is inferior.

It is an object of the present invention to provide an impeller capable of increasing the conversion efficiency of converting energy received by the blade into rotational energy and improving the strength of the blade, and a natural energy generator including the same. .

An impeller of the present invention is an impeller having a main shaft rotatably installed around an axis, and a blade fixed to the main axis and driven by wind or hydraulic power to rotate around the axis. ,

The blade has a straight portion extending in a direction parallel or perpendicular to the main axis, and a blade tip portion extending from an end of the straight portion,

The blade tip has a plurality of stages ( plural steps), or is formed in a curved shape to be spaced apart from the straight part as it goes from the base to the tip.

The impeller is a windmill or a water wheel.

According to this configuration, the cross-sectional shape including the main shaft center of the tip of the blade is inclined in multiple stages so as to be spaced apart from the straight part as it goes from the base end toward the tip, or is spaced from the straight part as it goes from the base end toward the tip. Since the shape was curved as much as possible, the eddy current at the tip of the blade from the tip of the blade can be reduced.

In particular, when the wing tip is inclined at multiple stages, compared to the case where the wing tip is inclined at one stage, even if each bending angle of the wing tip is gentle, the overall wing tip can be inclined greatly. . Therefore, when the length of the whole blade is made constant, the length of the straight part can be ensured long while ensuring the length in the horizontal direction of the blade tip part to a desired length.

In addition, in particular, when the blade tip is curved, compared to the case where the blade tip is inclined at one stage, the blade tip does not have a locally steep bent portion, and the blade tip as a whole can be inclined greatly. . Therefore, when the length of the whole blade is made constant, the length of the straight part can be ensured long while ensuring the length in the horizontal direction of the blade tip part to a desired length.

In this way, since the length of the straight part can be increased, the conversion efficiency of converting wind power, hydraulic power, and tidal energy (collectively referred to as “natural energy” or simply “energy”) received by the blade into rotational energy can be increased. . Moreover, by ensuring the length of the horizontal direction of a blade tip part to a desired length, the blade edge vortex which generate|occur|produces from a blade tip can be reduced reliably. In addition, when the blade tip is inclined in multiple stages, since the bending angle of each joint can be made gentle, the stress acting on the bent portion can be reduced, and the strength of the blade can be improved. . When the blade tip portion is curved, the local bending angle of the blade tip portion can be made gentle, so that the stress acting on the vent portion of the blade tip portion can be dispersed, and the strength of the blade can be improved.

In one embodiment of the present invention, a straight portion of the blade extends parallel to the main axis, and the blade may be connected to the main axis at a position radially spaced from the main axis through a support member. That is, the impeller is connected to a vertical spindle (main shaft) rotatably installed around the axis, a support integrally installed on the vertical spindle, and the vertical spindle via the support, and is driven by wind or hydraulic power. The impeller of a vertical shaft type provided with the blade|wing which rotates about the said axis|shaft center may be sufficient.

In one embodiment of the present invention, the impeller is a windmill for wind power generation of the vertical axis type, wherein a plurality of the blades extending in the vertical direction are spaced apart from the vertical main axis and installed around the vertical main axis, The shape of the cross-section of each of the blades may be such that, when the windmill is installed in the northern hemisphere of the earth, a rotational force that rotates counterclockwise in plan view is generated by the wind power.

In the course of the development of a small wind power generator, by defining the rotational direction of the blades in a specific direction, it became clear that the blades rotate even with small wind energy. Specifically, in Japan in the northern hemisphere, it was confirmed by reversing the direction of the blades extending in the vertical direction of a vertical shaft type windmill and mounting it on the main shaft. Compared to the right side, the left side is better under the same conditions rotated sharply. In the northern hemisphere, due to the rotation of the earth, typhoons, eddy currents, and even the eddies of drains are all around the left side (counterclockwise rotation). This is considered to be because the Coriolis force caused by the Earth's rotation is acting. On the other hand, when the blade receives wind according to the cross-sectional shape of the blade, the direction of rotation of the windmill is determined based on the lift force generated from the difference in flow velocity of air flowing through both surfaces of the blade.

According to the windmill of this configuration, when installed in the northern hemisphere, since the cross-sectional shape of each blade is a shape generated by wind power that rotates counterclockwise in plan view, the conventional vertical shaft type having blades in a clockwise direction With respect to a windmill for wind power generation, the rotational resistance can be reduced by effectively utilizing the action generated by the rotation of the earth, and many blades can be rotated under the same conditions. Therefore, by using the windmill for power generation which has a vertical main shaft, it is possible to generate electricity from the energy of a smaller wind.

In one embodiment of the present invention, the straight portion of the blade may extend radially outward with respect to the main shaft. That is, the impeller of the horizontal axis type may be sufficient as the said impeller.

In one embodiment of the present invention, the blade tip portion may be formed in a tapered shape that becomes narrower from the base end to the tip end. In this case, the blade edge vortex can be further reduced rather than making the blade tip into a flat shape, for example. Accordingly, it is possible to further increase the conversion efficiency of converting energy received by the blade into rotational energy.

The natural energy power generation apparatus of this invention is equipped with the impeller which concerns on any one embodiment in this invention, and the generator driven by this impeller. According to this structure, the conversion efficiency of converting energy received by a blade|wing into rotational energy can be improved compared with the conventional product. Therefore, especially in the vertical shaft type, it becomes possible to install this natural energy power generation device in the same place where installation has conventionally been withheld. Moreover, since the strength of a blade|wing can be improved compared with the conventional product, for example, reduction of blade material can be aimed at, and the improvement of maintainability can be aimed at.

In the natural energy power generation apparatus according to an embodiment of the present invention, the generator includes an output iron core on which an output coil is wound, and a magnetic field (main field winding) and an auxiliary field winding wound around it.界磁) includes an iron core, wherein either one of the output iron core and the field iron core serves as a stator, and the other serves as a rotor, and a rectifying means is connected to each of the field coils, and the blades As a self-excitation type power generator that rotates and obtains power generation by relative rotation of the stator and rotor, an initial excitation means for generating a magnetic force necessary for initial excitation of power generation; You may be equipped with more.

In the case of this configuration, since the generator is self-excited, power supply for separate excitation is unnecessary, the configuration is simple, and a permanent magnet for imparting a magnetic field is unnecessary, and cogging torque (cogging torque) is unnecessary. ) is small enough to not be a problem. Since the cogging torque is small, it can be started with a small torque. A magnetic field is required for starting, and it is possible to start if there is residual magnetic flux. However, by providing the above-mentioned initial excitation means, reliable starting is performed. Since the magnetic flux as a field increases as it rotates, the magnetic flux required for initial excitation is small and the influence on the cogging torque is small, so that rotation is started with a small torque to generate power.

In this way, the generator in which the initial excitation means is provided in a self-excitation type can be rotated with a small torque, and the advantage that electricity can be reliably generated can be obtained. On the other hand, the impeller having the tip of the inclined blade can increase the conversion efficiency. In particular, by combining an impeller of a vertical main shaft type having the inclined blade tip and a generator in which the initial excitation means is self-excited, the conventional natural energy power generation device has poor power generation efficiency. It becomes possible to perform necessary and sufficient power generation even under the conditions. In addition, in the impeller having the slanted wing tip and the impeller having a curved wing tip, there is an advantage that rotation is possible even in the breeze or in low-flow water. Therefore, by combining the vertical main shaft type impeller having the tip of the blade having such a shape and the generator provided with the initial excitation means in a self-excitation type, the advantage of the impeller in which rotation occurs even in the breeze or low-flow water, By effectively combining the characteristics of a generator capable of generating power by rotating it with a small torque, power generation in very little breeze or low-flow water, which could not be generated by a conventional natural energy power generation device, becomes possible.

Any combination of two or more configurations disclosed in the claims and/or specification and/or drawings is encompassed by the present invention. In particular, any combination of two or more of each of the claims is encompassed by the present invention.

The present invention will be more clearly understood from the following description of preferred embodiments with reference to the accompanying drawings. However, the embodiments and drawings are for the purpose of simple illustration and description, and are not used to delimit the scope of the present invention. The scope of the present invention is defined by the appended claims. In the accompanying drawings, the same reference numerals in a plurality of drawings indicate the same or corresponding parts.

BRIEF DESCRIPTION OF THE DRAWINGS It is a fracture|rupture plan view of the impeller which concerns on 1st Embodiment of this invention.
2 is a front view of the impeller.
3A is a front view of the wing of the impeller.
3B is a cross-sectional view taken along line IIIB-IIIB of FIG. 3A.
4 is a cross-sectional view taken along line IV-IV of FIG. 3B.
FIG. 5 is an enlarged view of part V of FIG. 3B .
It is a front view of the blade|wing of the impeller which concerns on 2nd Embodiment of this invention.
6B is a cross-sectional view taken along line VIB-VIB of FIG. 6A.
It is a fracture|rupture plan view of the impeller which concerns on 3rd Embodiment of this invention.
Fig. 8 is a front view of the impeller.
9A is a front view of a wing of the impeller.
9B is a cross-sectional view taken along line IXB-IXB of FIG. 9A.
FIG. 10 is a cross-sectional view taken along line XX of FIG. 9B .
11 is an enlarged view of part XI of FIG. 9B .
It is a front view of the blade|wing of the impeller which concerns on 4th Embodiment of this invention.
12B is a cross-sectional view taken along line XIIB-XIIB of FIG. 12A.
13 is a cutaway plan view of a windmill for wind power generation according to an embodiment of the present invention.
Fig. 14 is a cross-sectional view showing a cross section at the same position as the cross section shown in Fig. 10 with respect to the blade shown in Fig. 13;
It is explanatory drawing which combined the broken front view of the generator main body of the generator which concerns on embodiment of this invention, and a circuit diagram.
It is explanatory drawing which expands and shows the main generator main body in a linear form.
Fig. 17 is a circuit diagram showing an electric circuit configuration of the generator main body.
18A is a front view of a blade of a conventional impeller.
18B is a cross-sectional view taken along line XVIIIB-XVIIIB of FIG. 18A.

An impeller and a natural energy generator according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5 . 1 : is a fracture|rupture plan view of the impeller 18 which concerns on this embodiment. 2 : is a front view of this impeller 18. As shown in FIG. This impeller 18 is a so-called straight-blade vertical shaft impeller (vertical shaft type impeller) in which the blade 24 extends in the vertical direction. 1 and 2 , the natural energy generator 19 includes an impeller 18 and a generator 26 (described later) driven by the impeller 18 . The impeller 18 has a rotor Rt which is a rotating body, and a fixed base Kd which is a fixed body. The fixed base Kd has a support plate body 20 , a frame body 21 , and a base 25 . The support plate body 20 is a flat plate body mounted on a ground plane, and the base 25 is provided on the upper surface of this support plate body 20 . Inside the base 25, a generator 26, which will be described later, is installed.

The frame body 21 includes a plurality of (four in this example) columns 21a extending upward from the support plate body 20, and a plurality of horizontally connecting these posts 21a. It has the connecting member 21b and the some temporary member 21c. The plurality of connecting members 21b includes a plurality of connecting members 21b at an upper end connecting upper ends of adjacent posts 21a to each other, and a portion near the lower end of the adjacent posts 21a. It includes a plurality of connecting members (21b) of the lower end (下段) to connect. A temporary member 21c is erected across a predetermined connecting member 21b among the connecting members 21b at the upper end (upper side in Fig. 2 ) and the connecting member 21b opposing the connecting member 21b. Moreover, the temporary member 21c is erected over the connecting member 21b which is fixed among the connecting members 21b of the lower end (lower side in FIG. 2), and the connecting member 21b which opposes this connecting member 21b.

The rotor Rt has a vertical main shaft (main shaft) 22 , a support body 23 , and a blade 24 . A vertical main shaft 22 is rotatably supported via bearings 27 and 27, respectively, in the longitudinal middle portion of each temporary member 21c, 21c. The vertical spindle 22 extends in the vertical direction, and the lower end of the vertical spindle 22 extends to the inside of the base 25 . A plurality of supports 23 are provided so as to extend radially outward, respectively, from an intermediate vicinity of the vertical main shaft 22 in the longitudinal direction. These support bodies 23 are provided so that it may become parallel in the front view of this impeller 18, and may become the same phase in planar view of the impeller 18, for example.

The blades 24 are provided at the distal ends on both sides of the plurality of supports 23 , respectively. In this example, one blade 24 is connected to one end of the upper and lower supports 23 and 23, and the other blade 24 is connected to the other end of the upper and lower supports 23 and 23. have. These blades 24 and 24 are provided at positions 180° out of phase with the vertical main shaft 22 as the center. Each blade 24 extends along the vertical direction and is provided so as not to interfere with the frame body 21 in the frame body 21 . Each blade 24 receives wind or water from various directions and rotates around the axis L1 of the vertical main shaft 22 .

3A is a front view of the blade 24 of this impeller, and FIG. 3B is a cross-sectional view taken along line IIIB-IIIB of FIG. 3A. 3A and 3B , the blade 24 has a straight portion 28 and blade tip portions 29 and 29 extending from both ends of the straight portion 28 in the longitudinal direction, respectively. The straight portion 28 and the respective blade tip portions 29 and 29 are integrally formed of the same material. The straight part 28 extends parallel to the vertical main shaft 22 (FIG. 2) and has the same width at any position in the vertical direction when viewed from the front shown in FIG. 3A. In addition, as shown in FIG. 3B, the straight part 28 is formed in any position in an up-down direction with the same thickness.

Fig. 4 is a cross-sectional view taken along line IV-IV of Fig. 3B. As shown in Figs. 1 and 4, a plurality of (two in this example) blades 24 are each cut along a plane perpendicular to the axis L1 (Fig. 2) of the vertical main axis 22, and the cross section is the blade. A portion which is asymmetric with respect to the rotation direction of (24) and becomes thicker in the same cross section (the upper portion in Fig. 4) is used as the tip of each blade (24) in the rotation direction. Further, the outer surface 28a of the straight portion 28 of each blade 24 is a curved surface that becomes convex outward in the radial direction, and most of the inner surface 28b of the straight portion 28 is a flat surface 28ba. is doing

In addition, instead of making most of the inner surface 28b into the flat surface 28ba, it is good also considering the inner surface 28b as a curved surface with a larger radius of curvature than the outer surface 28a. In the inner surface 28b of the straight portion 28, a joint portion with one end in the circumferential direction of the outer surface 28a (upper side in Fig. 4) forms a circular arc surface 28bb. The joint portion between the arc surface 28bb and the flat surface 28ba is formed so as to connect smoothly without a step difference.

A joint portion between the inner surface 28b of the straight portion 28 and the other end in the circumferential direction (the lower side in FIG. 4 ) of the outer surface 28a is formed at an acute angle corner. The tip end of the support 23 is connected to a portion near the arc surface 28bb among the flat surfaces 28ba on the inner surface 28b of the straight portion 28 . The flat surface 28ba forms a plane perpendicular to the longitudinal direction of the support 23, and the vertical plane extends along the vertical direction.

2, 3A, and 3B, the blade tip parts 29 and 29 are so-called winglets which reduce the blade edge vortex from each blade tip. The blade tip 29 has a plurality of stages (in this example) such that the shape of the cross-section when the blade tip 29 is cut along the plane including the axis L1 is closer to the vertical main axis L1 as it goes from the base end to the tip. It is formed in a shape inclined (in other words, inclined in multiple steps so as to be spaced apart from the straight portion 28) in two steps). The upper and lower blade tip portions 29 and 29 are formed in the same shape that is symmetrical with respect to the center line L2 of the middle portion in the longitudinal direction of the straight portion 28 .

5 : is an enlarged view of the V part of FIG. 3B, ie, the upper blade|wing tip part 29. As shown in FIG. And, as described above, since the upper and lower wing tips 29 and 29 have the same shape that is symmetrical, only the upper wing tip 29 is assigned a reference number and will be described in detail, and the lower wing tip 29 is In Fig. 3B, the same reference numerals as those of the upper wing tip portion 29 are given, and detailed description thereof is omitted. 3B and 5 , the blade tip 29 includes a first-stage inclined portion 29a connected to the longitudinal tip of the straight portion 28, and the first-stage inclined portion 29a connected to the It has a 2nd-stage inclined part 29b.

The first slanted portion 29a is inclined toward the vertical main axis at an angle θ1 with respect to the straight portion 28 in the cross section. The first slanted portion 29a is formed to have the same thickness t1 at any position in the vertical direction. A second-stage inclined portion 29b is connected to the upper end of the first-stage inclined portion 29a. The second-stage inclined portion 29b is inclined toward the vertical main axis at an angle θ2 with respect to the first-stage inclined portion 29a in the cross section. The inclined portion 29b of the second step is formed in a cross-sectional shape in which the thickness t2 in the cross-section becomes thinner toward the upper end. In addition, each angle θ1 and θ2 is defined as an angle formed by a centerline in the width direction of the straight portion 28 defining the angle, the first slanted portion 29a, and the second slanted portion 29b. Each of the angles θ1 and θ2 is set to be larger than the angle θ (Fig. 18B) of the joint 53 of the conventional example. In this example, the angles θ1 and θ2 are set to the same angle, provided that the angles θ1 and θ2 are the same angle. is not limited to

According to the blade 24 of the impeller 18 described above, the cross-section including the main shaft center of the blade tip portion 29 is inclined so as to reach the vertical main shaft side from the base end to the tip end. It is possible to reduce the blade edge vortex from In particular, since the blade tip portion 29 is inclined in multiple stages, compared to the case where the blade tip portion 29 is inclined to one stage, even if the bending angles θ1 and θ2 of each joint 30, 31 of the blade tip portion 29 are gentle, It is possible to make the blade tip portion 29 largely inclined as a whole. Therefore, when the length of the whole blade is made constant, the length Lv of the straight part 28 can be ensured long while ensuring the length Lh of the horizontal direction of the blade tip part 29 to a desired length. As described above, in addition to being able to reliably reduce the blade edge vortex from the tip of the blade, the desired water wind area or water reception area can be secured, so that rotation is possible even with a slight breeze or low flow velocity of water.

In this way, since the length Lv of the straight part 28 can be made long, the conversion efficiency of converting energy received by the blade|wing 24 into rotational energy can be improved. In addition, by securing the horizontal length Lh of the blade tip 29 to a desired length, the blade edge vortex generated from the blade tip can be reliably reduced, and the bending angle of each joint can be made gentle, The stress acting on the vent portion can be reduced, and the strength of the blade 24 can be improved.

Since the blade tip part 29 was made into the tapered shape which becomes narrower as it goes from the base end to the tip, the blade edge vortex can be further reduced rather than making the blade tip into a flat shape, for example. Accordingly, it is possible to further increase the conversion efficiency of converting energy received by the blade 24 into rotational energy.

The blade tip 29 of the vertical shaft impeller 18 cuts the blade tip 29 along the plane including the axial center L1, and the cross section viewed from the base end toward the tip, the vertical main axis L1 It is good also as a cross-sectional shape inclined in multiple steps|stages so that it may become distant to the side opposite to a side. A plurality of stages of blades 24 may be provided in the vertical direction with respect to one vertical main shaft 22 . In this case, the wind-receiving area of the blade 24 can be increased with respect to the installation area of the impeller. The number of blades is not limited to two per stage, and may be three or more.

A second embodiment of the present invention will be described. In the following description, in each aspect, the same reference code|symbol is attached|subjected to the part corresponding to the matter demonstrated in the preceding aspect, and the overlapping description is abbreviate|omitted. In the case where only a part of the configuration is described, the other parts of the configuration are the same as those described previously, unless otherwise specified. The same operation and effect can be obtained from the same structure. In addition to the combination of parts specifically described in each embodiment, it is also possible to partially combine the embodiments as long as the combination does not interfere with each other.

Fig. 6A is a front view of a blade 24A of the impeller according to the second embodiment, and Fig. 6B is a cross-sectional view taken along the line VIB-VIB of Fig. 6A. This impeller is a horizontal shaft impeller in which the straight part 28A of the blade 24A extends radially outward with respect to the main shaft 22. As shown in FIG. That is, the main shaft 22 is rotatably installed around the shaft center L1, and a plurality (for example, about 2 to 5 pieces: 1 in FIG. 6A) at a certain interval in the circumferential direction on the outer periphery of the main shaft 22 A wing 24A of (only dogs are shown) is fixed. The straight portion 28A of the blade 24A is formed to have a wide width from the base end to the front end when viewed from the front shown in Fig. 6A. Other than that, it has the same structure as that of the first embodiment described above. As the blade 24A is spaced apart from the center of rotation of the main shaft 22, it is possible to secure a larger torque. In addition, the direction in which the blade tip part 29 is inclined may be toward the base end side of the main shaft 22, and may be directed toward the front end side of the main shaft 22. As shown in FIG. According to this configuration, since the straight portion 28A is formed wide from the base to the tip, that is, the area is increased, the conversion efficiency of the tip of the straight portion 28A that can secure a large torque can be further increased. have. In addition, since the blade tip portion 29 has a cross-sectional shape inclined in multiple stages as described above, the conversion efficiency of converting energy received by the blade 24A into rotational energy is increased, and the strength of the blade 24A is improved. can do it

An impeller and a natural energy generator according to a third embodiment of the present invention will be described with reference to FIGS. 7 to 11 . 7 : is a broken plan view of the impeller 18 which concerns on this embodiment. FIG. 8 is a front view of the impeller 18 . In the following description, in each aspect, the same reference code|symbol is attached|subjected to the part corresponding to the matter demonstrated in the preceding aspect, and the overlapping description is abbreviate|omitted. In the case where only a part of the configuration is described, the other parts of the configuration are the same as those described previously, unless otherwise specified. The same operation and effect can be obtained from the same structure. In addition to the combination of parts specifically described in each embodiment, it is also possible to partially combine the embodiments as long as the combination does not interfere with each other.

Fig. 9A is a front view of the blade 24 of this impeller, and Fig. 9B is a cross-sectional view taken along line IXB-IXB of Fig. 9A. 9A and 9B , the blade 24 has a straight portion 28 and blade tip portions 29 and 29 extending from both ends of the straight portion 28 in the longitudinal direction, respectively. The straight portion 28 and the respective blade tip portions 29 and 29 are integrally formed of the same material. The straight portion 28 extends parallel to the vertical main shaft 22 (FIG. 8) and has the same width at any position in the vertical direction when viewed from the front shown in FIG. 9A. In addition, as shown in FIG. 9B, the straight part 28 is formed in any position in an up-down direction with the same thickness.

Fig. 10 is a cross-sectional view taken along the line X-X of Fig. 9B. As shown in FIGS. 7 and 10 , the plurality of blades 24 (two in this example) each have a cross section viewed by cutting along a plane perpendicular to the axis L1 ( FIG. 8 ) of the vertical main shaft 22 . A portion which is asymmetric with respect to the rotational direction of (24) and becomes thicker in the same cross section (upper portion in Fig. 10) is used as the tip of each blade (24) in the rotational direction. Further, the outer surface 28a of the straight portion 28 of each blade 24 is a curved surface that becomes convex outward in the radial direction, and most of the inner surface 28b of the straight portion 28 is a flat surface 28ba. is doing

In addition, instead of making most of the inner surface 28b into the flat surface 28ba, it is good also considering the inner surface 28b as a curved surface with a larger radius of curvature than the outer surface 28a. In the inner surface 28b of the straight portion 28, a joint portion with the circumferential end (upper side in FIG. 10) of the outer surface 28a forms a circular arc surface 28bb. The joint between the arc surface 28bb and the flat surface 28ba is formed so as to connect smoothly without a step difference.

A joint portion between the inner surface 28b of the straight portion 28 and the other end in the circumferential direction (the lower side in FIG. 10 ) of the outer surface 28a is formed at an acute angle corner. The tip end of the support 23 is connected to a portion near the arc surface 28bb among the flat surfaces 28ba on the inner surface 28b of the straight portion 28 . The flat surface 28ba forms a plane perpendicular to the longitudinal direction of the support 23, and the vertical plane extends along the vertical direction.

As shown to FIG.8, FIG.9A, and FIG.9B, the blade|wing tip parts 29 and 29 are what is called a winglet which reduces the blade edge vortex from each blade|wing tip. The blade tip 29 is cut so that the shape of the cross-section (spindle cross-section) seen by cutting the blade tip 29 along the plane including the shaft center L1 is closer to the vertical spindle L1 side as it goes from the base end to the tip [ In other words, it is formed in a curved shape so as to be spaced apart from the straight portion 28]. The upper and lower blade tip portions 29 and 29 are formed in the same shape that is symmetrical with respect to the center line L2 of the middle portion in the longitudinal direction of the straight portion 28 .

Fig. 11 is an enlarged view of section XI of Fig. 9B, that is, the upper wing tip portion 29. As shown in Figs. And, as described above, since the upper and lower wing tips 29 and 29 have the same shape that is symmetrical, only the upper wing tip 29 is assigned a reference number and will be described in detail, and the lower wing tip 29 is In FIG. 9B, the same code|symbol as the upper blade|wing tip part 29 is attached|subjected, and the detailed description is abbreviate|omitted. As shown in FIGS. 9B and 11 , the blade tip 29 is formed of a curved portion 29a connected to the longitudinal tip 30 of the straight portion 28 .

This curved part 29a is formed so that it may bend gently toward the vertical main axis|shaft side as it goes to the front-end|tip. The main axis section of the curved portion 29a includes an inner surface side portion 29aa on the vertical main axis side and an outer surface side portion 29ab on the opposite side to this inner surface side portion 29aa. The inner surface side portion 29aa runs smoothly without a step to the inner surface 28b of the straight portion 28 , and the outer surface side portion 29ab smoothly runs without a step to the outer surface 28a of the straight portion 28 . . These inner surface side portions 29aa and outer surface side portions 29ab each have predetermined radii of curvature Ra and Rb. The centers of curvature C1 and C2 of the inner surface side portion 29aa and the outer surface side portion 29ab are, for example, in the vicinity of the middle of the straight portion 28 and the vertical main shaft 22 (Fig. 8), and also It is located at about the same height as the longitudinal tip 30 of the straight part 28 . The centers of curvature C1 and C2 of these inner surface side portions 29aa and outer surface side portions 29ab are set at different positions. Further, the curved portion 29a is formed in a cross-sectional shape in which the thickness t1 in the cross section of the main shaft becomes thinner as it goes toward the upper end. And the curvature radii Ra and Rb are suitably determined from the results of experiments, simulations, etc., for example.

According to the blade 24 of the impeller 18 described above, the main axis cross section of the blade tip portion 29 has a cross-sectional shape that approaches the vertical main axis side as it goes from the base end to the front end, so the blade tip vortex from the blade tip is reduced. can be reduced In particular, as the wing tip 29 is directed toward the tip, the shape close to the vertical main axis is curved, so that a locally steep bend is produced at the wing tip 29 compared to the case of inclining to one stage. Without it, the blade tip 29 can be inclined largely as a whole. Therefore, when the length of the whole blade is made constant, the length Lv of the straight part 28 can be ensured long while ensuring the length Lh of the horizontal direction of the blade tip part 29 to a desired length. As described above, in addition to being able to reliably reduce the blade edge vortex from the tip of the blade, the desired water wind area or water reception area can be secured, so that rotation is possible even with a slight breeze or low flow velocity of water.

In this way, since the length Lv of the straight part 28 can be made long, the conversion efficiency of converting energy received by the blade|wing 24 into rotational energy can be improved. In addition, by securing the horizontal length Lh of the blade tip 29 to a desired length, the blade edge vortex generated from the blade tip can be reliably reduced, and the local bending angle of the blade tip 29 can be made gentle. Therefore, it is possible to disperse the stress acting on the vent portion of the blade tip portion 29, it is possible to improve the strength of the blade 24.

Since the blade tip part 29 was made into the tapered shape which becomes narrower as it goes from the base end to the tip, the blade edge vortex can be further reduced rather than making the blade tip into a flat shape, for example. Accordingly, it is possible to further increase the conversion efficiency of converting energy received by the blade 24 into rotational energy.

Further, it is assumed that the inner surface side portion 29aa and the outer surface side portion 29ab of the curved portion 29a have the same radius of curvature, and the thickness t1 in the main axis section of the curved portion 29a is defined in any of the vertical directions. It is good also as the same thickness in a position. The inner surface side portion 29aa and the outer surface side portion 29ab of the curved portion 29a each have a predetermined radius of curvature from the base end to a certain constant position, and from the constant position to the tip end are parabolic such as quadratic curves. It may consist of a curve of The relationship between this radius of curvature and the parabolic curve may be reversed. In addition, the radius of curvature and the parabolic curve may be combined in combination.

A fourth embodiment of the present invention will be described. In the following description, in each aspect, the same reference code|symbol is attached|subjected to the part corresponding to the matter demonstrated in the preceding aspect, and the overlapping description is abbreviate|omitted. In the case where only a part of the configuration is described, the other parts of the configuration are the same as those described previously, unless otherwise specified. The same operation and effect can be obtained from the same structure. In addition to the combination of parts specifically described in each embodiment, it is also possible to partially combine the embodiments as long as the combination does not interfere with each other.

Fig. 12A is a front view of a blade 24A of the impeller according to the fourth embodiment, and Fig. 12B is a cross-sectional view taken along the line XIIB-XIIB of Fig. 12A. This impeller is a horizontal shaft type in which the straight part 28A of the blade 24A extends outward in the radial direction with respect to the main shaft 22 . That is, the main shaft 22 is rotatably installed around the shaft center L1, and a plurality (for example, about 2 to 5 pieces: only one is displayed in Fig. 12A at regular intervals in the circumferential direction on the outer periphery of the main shaft 22) The wing 24A of) is fixed. The straight part 28A of the blade 24A is formed in a wide width as it goes from the base end to the front end as seen from the front shown in FIG. 12A. Other than that, it has the same structure as the above-mentioned embodiment. The blade 24A can secure a larger torque as it is spaced apart from the rotation axis of the main shaft 22 . The direction in which the blade tip portion 29 is inclined may be toward the proximal end side of the main shaft 22 or toward the front end side of the main shaft 22 . According to this configuration, since the straight portion 28A is formed wide from the base end to the front end, that is, the area is increased, the conversion efficiency of the front end of the straight portion 28A that can secure a large torque can be further increased. have. In addition, since the cross-section of the wing tip portion 29 has a cross-sectional shape that approaches the vertical main axis as it goes from the base end toward the tip, the conversion efficiency of converting energy received by the blade 24A into rotational energy is increased, while the blade The strength of (24A) can be improved.

A windmill for wind power generation that is an impeller according to a fifth embodiment of the present invention and a wind power generator that is a natural energy generator will be described with reference to Figs. 13 and 14 . 13 is a cutaway plan view of an impeller (windmill) 18 for wind power generation according to this embodiment. This windmill 18 is a so-called straight-blade vertical shaft type windmill in which blades 24 extend in the vertical direction. This windmill 18 is to be installed in the northern hemisphere. In the following description, in each aspect, the same reference code|symbol is attached|subjected to the part corresponding to the matter demonstrated in the preceding aspect, and the overlapping description is abbreviate|omitted. In the case where only a part of the configuration is described, the other parts of the configuration are the same as those described previously, unless otherwise specified. The same operation and effect can be obtained from the same structure. In addition to the combination of parts specifically described in each embodiment, it is also possible to partially combine the embodiments as long as the combination does not interfere with each other.

In addition, the shape of the blade 24 of the impeller (windmill) 18 which concerns on this embodiment is the impeller 18 of a vertical shaft type|mold, the impeller 18 of said 1st Embodiment, and 3rd Embodiment. Although the shape of any blade 24 among the impellers 18 of An example will be described.

14 : is sectional drawing which showed the cross section at the same position as the cross section shown in FIG. 10 of 3rd Embodiment with respect to the blade|wing 24 of this embodiment shown in FIG. 13. FIG. 13 and 14, the cross section of the plurality of blades 24 (two in this example) has a rotational direction in a specific direction (counterclockwise rotational direction indicated by arrow R1 in FIG. 13) irrespective of the wind direction. It is formed in a prescribed shape. That is, each of the plurality of blades 24 has a cross section cut along a plane perpendicular to the axis L1 of the vertical main shaft 22 and is asymmetric with respect to the rotation direction of the blade 24, and the portion ( The lower part in FIG. 14) is used as the front-end|tip of each blade|wing 24 in the rotation direction. Further, the outer surface 28a of the straight portion 28 of each blade 24 is a curved surface that becomes convex outward in the radial direction, and most of the inner surface 28b of the straight portion 28 of each blade 24 is is the flat surface 28ba.

In addition, instead of making most of the inner surface 28b into the flat surface 28ba, it is good also considering the inner surface 28b as a curved surface with a larger radius of curvature than the outer surface 28a. In the inner surface 28b of the straight portion 28, a joint portion with the circumferential end (lower side in FIG. 14) of the outer surface 28a forms a circular arc surface 28bb. The joint between the arc surface 28bb and the flat surface 28ba is formed so as to connect smoothly without a step difference.

The joint between the inner surface 28b of the straight portion 28 and the other end in the circumferential direction (upper side in FIG. 14 ) of the outer surface 28a is formed at an acute corner. The tip end of the support 23 is connected to a portion near the arc surface 28bb among the flat surfaces 28ba on the inner surface 28b of the straight portion 28 . The flat surface 28ba forms a plane perpendicular to the longitudinal direction of the support 23, and the vertical plane extends along the vertical direction.

When such a blade 24 receives wind, the flow velocity along the outer surface 28a is faster than the flow velocity along the inner surface 28b, and the pressure distribution around the blades has a large negative pressure on the outer surface 28a. will lose Therefore, the lift force L from the inner side to the outer side of the wing as a whole is generated. As shown in Fig. 14, the lift force generated in the blade by the combined wind speed w of the relative wind speed v generated by the rotation of the blade 24 and the wind speed u is denoted by L. Then, the combined component (Lt-Dt) in the t direction of the lift force L and the drag force D becomes the force in the rotational direction of the blade 24 .

When the windmill 18 having the above-described plurality of blades 24 defined in the counterclockwise direction regardless of the wind direction is installed in the northern hemisphere, the conventional vertical axis type wind power generation having blades in a clockwise direction is used. With respect to the windmill, the rotational resistance can be reduced by effectively using the Coriolis force generated by the rotation of the earth, and many blades 24 can be rotated under the same conditions. Therefore, by using the windmill 18 for power generation having the vertical spindle 22, it is possible to generate electricity from less wind energy. Since the windmill 18 is a straight-blade vertical shaft type windmill, the ratio between the lift and drag acting on the blades 24 can be increased. In addition, a large torque can be obtained with a high circumferential speed ratio.

Next, the generator 26 will be described together with FIGS. 15 to 17 . Inside the base 25 (FIG. 2), a generator 26 that generates power by rotating a rotor 5 described later by rotation of the vertical spindle 22 (FIG. 2) is provided. 15 : is explanatory drawing which combined the broken front view of the generator main body 1 of the generator 26, and a circuit diagram. In Fig. 15, the generator body 1 of the generator 26 has an annular stator 4 and a rotor ( 5) has For example, this rotor 5 and the above-mentioned vertical main shaft (FIG. 2) are connected coaxially. The stator 4 has an output iron core 6 and an output coil 7 . This embodiment is an example applied to a two-pole generator, and the output iron core 6 is a gear-shaped magnetic pole protruding inward at two circumferential directions of the annular yoke part 6a. A part 6b is formed. The output coil 7 is wound around each magnetic pole portion 6b.

As shown in FIG. 16 , the output coil 7 of each magnetic pole part 6b has a magnetic pole face facing the inner diameter side of the adjacent magnetic pole part 6b of the output iron core 6 . As shown in ), the different magnetic poles are connected in series. Both ends of the output coil 7 become terminals 7a and 7b, and an external load 3 is connected to these terminals 7a and 7b as shown in Fig. 15, and current is drawn out from the generator.

15 and 16 , the rotor 5 has a field core 8 , and a main field coil 9 and a secondary field coil 10 wound around the field core 8 . The magnetic field core 8 is provided with a plurality of gear-shaped magnetic pole portions 8b protruding toward the outer diameter side by side in the circumferential direction on the outer periphery of the iron core body 8a having a central hole. Three magnetic pole parts 8b are provided for each magnetic pole part 6b of the output iron core 6, respectively.

The main field coil 9 is wound over two adjacent magnetic pole parts 8b and 8b, and each main field coil 9 wound over these two magnetic pole parts 8b and 8b has two As different magnetic poles appear on the magnetic pole faces of adjacent magnetic pole pairs in a set, they are connected in series. The secondary field coil 10 shifts the phase by the amount of the main field coil 9 and one magnetic pole part 8b, and similarly to the main field coil 9, two adjacent magnetic pole parts 8b and 8b. is wound over. Each sub-field coil 10 wound over these two magnetic pole portions 8b and 8b is connected in series, as different magnetic poles appear on the magnetic pole faces of adjacent magnetic pole pairs in pairs. The terminals of both ends of the series connection body of the main field coil 9 and the secondary field coil 10 are respectively shown in FIG. 16 by code|symbol "9a", "9b", "10a", and "10b".

As shown in Fig. 17, a rectifying element (rectifying means) 11 is connected in parallel to the main field coil 9, and a current in a direction allowing the rectifying element 11 to flow in the main field coil 9 is generated. flows The sub-field coil 10 is connected in series with the main field coil 9, and a rectifying element (rectifying means) 12 is also connected in series, and the sub-field coil 10 has the same Only direction current flows. Arrows in the drawing indicate the direction in which current flows.

The generator 26 includes an initial excitation means 2 for generating a magnetic force necessary for the initial excitation of power generation in a self-excitation type generator having such a sub-field coil 10 configuration. have As shown in FIG. 15 , a power supply 14 for magnetization is connected to the output coil 7 via a switching means 13 in parallel with the external load 3 . The initial excitation means (2) is constituted by the magnetizing power supply (14) and the switching means (13). As the switching means 13, a semiconductor switching element or a contact switch is used. The magnetizing power supply 14 is a power storage means such as a secondary battery or a capacitor. When the external load 3 is a secondary battery, it may be used as a magnetizing power source.

In order to perform magnetization , a current of a predetermined size is allowed to flow for an extremely short time. The degree of magnetization is such that residual magnetism necessary for initial excitation for the start of power generation can be obtained, and is determined by the magnitude of the current and the on time of the switching means 13 . The opening/closing operation of the switching means 13 is performed by the opening/closing control means 15 . The opening/closing control means 15 monitors the detection signal of the rotation detection means 16 which detects the rotation of the rotor 5, for example, and when it is detected that the rotor 5 has started rotation from a stopped state, The switching means 13 is turned on for a set time required for magnetization.

And, when the rotation stop time of the rotor 5 is short, residual magnetism is sufficiently left, so that the opening/closing control means 15 starts rotation only after stopping the rotor 5 for a set time or longer. It is good also as control so that the switching means 13 may be turned on according to a setting condition, such as turning on the switching means 13. As shown in FIG. Moreover, you may make it magnetize only when electricity generation is not started even if it becomes a predetermined rotation speed, and you may magnetize when rotation of a generator is stopped every predetermined time.

Although the power supply 14 for magnetization is connected to the output coil 7 in this embodiment, as shown in FIG. 17, the power supply 14 for magnetization is connected to the field coils 9 and 10 via the switching means 13. You can do it. Also in the case of this example, the magnetizing power supply 14 is a secondary battery or a capacitor. In order to magnetize, a current of a predetermined magnitude may be allowed to flow for an extremely short time. The switching means 13 is opened/closed by the opening/closing control means 15 similarly to the embodiment of FIG. 15 .

An operation in the case where the rotor 5 rotates to generate electricity will be described. As shown in Fig. 17, since the rectifying element 11 is connected in parallel to the main field coil 9, a current in the direction in which the rectifying element 11 can flow flows through the main field coil 9. Therefore, magnetic flux in the direction determined by the current that can flow through the main field coil 9 is generated. Further, by electromagnetic induction, a current flows in a direction that prevents a decrease in magnetic flux in the same direction as the magnetic flux produced by the current, but does not flow in a direction that prevents an increase in magnetic flux. Therefore, the decrease of the magnetic flux can be prevented, but the increase of the magnetic flux cannot be hindered. The rectifying element 12 is connected in series to the secondary field coil 10, and only the current in the same direction as the main field coil 9 flows.

15 to 17 , current flows in the main field coil 9 due to the residual magnetism of the output core 6 or the field core 8 . With this current, the magnetic flux linking to the secondary field coil 10 is changed by the magnetic flux produced by the primary field coil 9 , and a voltage is generated in the secondary field coil 10 . With this voltage, the secondary field coil 10 supplies a current through the main field coil 9 and increases the current flowing through the main field coil 9 . When the current is not supplied because the voltage is not induced in the secondary field coil 10 , a reflux current flows through the commutator 11 to the main field coil 9 . keep the flux

As current is supplied to the main field coil 9 and the magnetic flux produced by the main field coil 9 increases, the magnetic flux linkage in the secondary field coil 10 also increases, and a large current flows to the main field coil 9 . is supplied In this way, the current of the main field coil 9 gradually increases, and the field magnetic flux necessary for power generation is created. Due to the relative motion of the output iron core 6 and the magnetic field core 8, the magnetic flux linkage of the output coil 7 is changed to generate a voltage.

As described above, power is generated while the rotor 5 is rotating, but since the rotor 5 is stopped for a certain long period of time, residual magnetism is generated in either the output core 6 or the field core 8. or the residual magnetism is insufficient to initiate power generation. Then, in this embodiment, at the time of the start of rotation after the stop of the rotor 5, the switching means 13 of the initial stage excitation means 2 is turned on, and the output coil 7 is magnetized from the power supply 14 for magnetization. A current is passed to magnetize the output iron core (6). Since the magnetic flux gradually increases as the rotation continues as described above, the degree of magnetization becomes such that the residual magnetism necessary for the initial excitation for the start of power generation can be obtained. Therefore, in order to perform magnetization, a current of a predetermined magnitude may be allowed to flow for an extremely short time. Due to this magnetization, even after the rotor 5 is stopped for a long time, power generation is reliably started by restarting the rotation.

In the case of the embodiment in which the switching means 13 is provided, when the rotation of the rotor 5 is started after stopping, the switching means 13 of the initial excitation means 2 is turned on and the magnetizing power supply 14 is turned on. A magnetizing current is passed through the main field coil (8) to magnetize the field core (8). In this way, even when the magnetic field core 8 is magnetized, power generation is started even after the rotor 5 is stopped for a long time.

According to the generator 26 of this embodiment, the following advantages can be acquired. Since the generator 26 is a self-excited generator, there is no need for power supply for tamping, the configuration is simple, and a permanent magnet for applying a magnetic field is unnecessary, and the cogging torque is small enough that it does not become a problem. Since the cogging torque is small, it can be started with a small torque. A magnetic field is required for starting, and if there is a residual magnetic flux, it can be started, but the residual magnetic flux may disappear due to long-term neglect or maintenance, and if the residual magnetic flux is extinguished, it cannot be started. However, by providing the initial excitation means 2, reliable starting is performed. Since the magnetic flux serving as the field increases as it rotates, the magnetic flux required for initial excitation is small, and the influence on the cogging torque is also small.

As described above, the generator 26 provided with the initial excitation means 2 in a self-excited manner can be rotatable with a small torque and has the advantage of reliably generating electricity. On the other hand, the impeller 18 having the inclined blade tip portion 29 can increase the conversion efficiency. In particular, by combining the vertical spindle type impeller 18 having the inclined blade tip portion 29 and the generator 26 provided with the initial excitation means 2 in a self-excitation type, a conventional natural energy generation device It becomes possible to perform necessary and sufficient power generation even under an environment where power generation efficiency was poor. In addition, in the impeller 18 having the inclined wing tip 29 and the impeller 18 having the curved wing tip 29, there is an advantage that rotation is possible even in the breeze or low-flow water. Therefore, by combining the vertical spindle type impeller 18 having the blade tip 29 of such a shape and the generator 26 provided with the initial excitation means 2 in a self-excitation type, the breeze or low flow velocity By effectively combining the advantages of the impeller 18, which can rotate even in water, and the characteristics of the generator 26 that can rotate with a small torque and generate electricity, it is extremely difficult to generate electricity in the conventional natural energy generator. Power generation in low winds or low-flow water is possible.

Although it is self-excitation type, since the initial excitation means 2 for magnetizing the iron core of any one of the generators is provided to such a degree that it is possible to generate the magnetic force necessary for the initial excitation of power generation, even after stopping the rotation or after disassembling and repairing, it is also rotated at a low speed Even then, it is possible to reliably start power generation. The initial excitation means (2) is required, but the initial excitation means (2) should be capable of performing magnetization to the extent that it is possible to generate a magnetic force required for the initial excitation of power generation. -Excited type), it becomes a remarkably small one compared to the external power source of the generator.

Incidentally, in the above embodiment, the output iron core 6 on the stator 4 side and the field core 8 on the rotor 5 side are used. On the contrary, the stator 4 side is the field core 9 and 10 , the rotor 5 side may be the output iron core 6 . In addition, although it was set as a 2-pole generator in the said embodiment, it is good also as a multipole generator, such as a 4-pole, 8-pole, 16-pole. Incidentally, the generator is not limited to the self-excitation generator, but may be a self-excitation generator or a generator of various other types.

The generator 26 may use a synchronous generator using a permanent magnet for generation of a field.

It is also possible to install a plurality of generators 26 with respect to one vertical spindle 22, and to individually generate power to each generator 26 by rotation of the one vertical spindle 22.

As mentioned above, although the form for implementing this invention was described based on embodiment, this disclosed embodiment is an illustration in all points, and is not restrictive. The scope of the present invention is indicated by the claims rather than in the description above, and it is intended to include all modifications within the meaning and scope equivalent to the claims.

2: Early woman means
4: stator
5: Rotor
6: output iron core
7: output coil
8: field iron core
9: main field coil
10: patriarchal coil
11, 12: rectifying element (rectifying means)
18: impeller
19: natural energy generator
22: vertical spindle (spindle)
23: support
24, 24A: Wings
26: generator
28: straight part
29: wing tip

Claims (7)

A main shaft (main shaft) that is rotatably installed around the axis (軸心); and
a blade fixed to the main shaft and driven by wind or hydraulic power to rotate around the shaft;
As a turbine rotor comprising a,
The wings are
a straight part connected to the main axis at a position spaced apart from the main axis in a radial direction through a support and extending parallel to the main axis; and
and a blade tip portion extending from an end of the straight portion;
The blade tip portion has a plurality of stages ( It is formed in an inclined shape with plural steps),
Each wing tip has a first-stage inclined portion connected to the longitudinal tip of the straight portion and a second-stage inclined portion following the first-stage inclined portion,
The inclined portion of the first step is formed with the same thickness at any position in the vertical direction,
The inclined portion of the second step is formed in a cross-sectional shape that becomes thinner as the thickness goes toward the tip,
wing car. According to claim 1,
The impeller is a windmill for wind power generation, wherein a plurality of the blades extending in the vertical direction are spaced apart from the vertical main axis and installed around the vertical main axis, and the shape of the cross-section of each of the blades is such that the windmill is located in the northern hemisphere of the earth. When installed in, the impeller, which is a shape generated by wind force that rotates counterclockwise in a plan view. 3. The method of claim 1 or 2,
The said blade tip part is formed in the tapered shape used as the narrow width|variety from a base end toward a front-end|tip. The impeller according to claim 1 or 2; and
a generator driven by the impeller;
A natural energy generating device comprising a. A natural energy generating device comprising a turbine rotor and a generator driven by the turbine rotor, the apparatus comprising:
The wing wheel,
A main shaft (main shaft) that is rotatably installed around the axis (軸心); and
a blade fixed to the main shaft and driven by wind or hydraulic power to rotate around the shaft;
including,
The wings are
a straight portion extending in a direction parallel or perpendicular to the main axis; and
and a blade tip portion extending from an end of the straight portion;
The blade tip portion has a plurality of stages ( plural steps) in an inclined shape, or is formed in a curved shape to be spaced apart from the straight part as it goes from the base to the tip,
The generator is
an output iron core on which the output coil is wound; and
A main field coil (main field winding) and an auxiliary field coil (auxiliary field winding) is a wound field iron core;
One of the output iron core and the field iron core serves as a stator, and the other serves as a rotor, a rectifying means is connected to each of the field coils, and the blade rotates to rotate the stator and the rotor. As a self-excitation type power generator that obtains generated power by relative rotation,
The apparatus for generating natural energy, further comprising an initial excitation means for generating a magnetic force necessary for initial excitation of power generation. delete delete

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