JP6130680B2 - Vertical axis fluid power generator - Google Patents

Description

  The present invention relates to a vertical axis fluid power generation apparatus.

At present, wind power generators using wind power, which is natural energy, are attracting attention because of problems such as an increase in greenhouse gas emissions and the depletion of fossil fuels.
As a general structure, a wind power generator drives a generator by power (rotational force) generated by rotation of a rotor portion of a windmill attached to a tip portion of a support. Since the wind power generator does not use fuel to generate power, the amount of fossil fuel used can be reduced. That is, it is possible to reduce the discharge amount of carbon dioxide. Furthermore, since the structure of a wind power generator is comparatively simple, it has the characteristic that installation is easy.

  For example, in the vertical axis type wind power generator described in Patent Document 1, a rotating shaft connected to a rotor portion composed of a plurality of blades (blades) and arms (support members) extends in a vertical direction with respect to the ground. Is done. The rotating shaft is rotatably supported with respect to the support (cylinder) via a plurality of bearings (bearings).

JP 2005-127209 A

In a vertical axis hydroelectric generator such as a vertical axis wind power generator, an external force in the radial direction or thrust direction of the rotary shaft acts on the rotary shaft due to the movement of the working fluid, the weight of the blade and the rotary shaft, or the like. However, in the conventional vertical axis type wind power generator, the bearing cannot fully support these loads, and the rotating shaft may not be able to rotate smoothly.
Therefore, it is conceivable to increase the outer diameter of the bearing to ensure sufficient load resistance and durability. However, since the outer diameter of the rotating shaft and the support is also increased, there is a problem that the ratio of the side projection area of the support to the wind receiving area is increased and the rotation efficiency and power generation efficiency of the rotor portion are reduced. It was. In addition, there is a problem that the weight and cost of the apparatus are increased.

  The present invention has been made in view of such circumstances, avoiding a decrease in rotational efficiency of the rotor portion while ensuring the load resistance and durability of the bearing, and reducing the weight and cost of the device. An object of the present invention is to provide a vertical axis fluid power generation apparatus capable of achieving the above.

An embodiment of the vertical shaft type fluid power generation device according to the present invention includes a rotating shaft connected via a pair of arms to which a plurality of blades are respectively attached in the axial direction, and the rotating shaft via a plurality of bearings. And a support that is rotatably supported, wherein the bearing includes a double row angular ball bearing, and when the pair of arms are horizontal arms , the first shortest distance from the center of the angular contact ball bearing of the double row to the center position of the arm arranged in angular contact ball bearing side of the double row of the pair of arms in the axial direction, 3 of the total length of the blade is set to ~ 17%, the second shortest distance from the angular ball bearing arranged on the side end of the double row of the blades in the axial direction to the center position of the angular contact ball bearing of the double row, before It is set to 10 to 24% of the total length of the blade, and is disposed on the double-row angular ball bearing side of the pair of arms from an end portion of the blade disposed on the double-row angular ball bearing side in the axial direction. The third shortest distance to the center position of the attachment position of the arm to the blade is set to 16 to 27% of the total length of the blade .
Further, an embodiment of the vertical shaft type fluid power generation device according to the present invention includes a rotating shaft connected via a pair of arms to which a plurality of blades are respectively attached in the axial direction and a plurality of bearings. And a support that is rotatably supported via the bearing, wherein the bearing includes a double-row angular ball bearing, and when the pair of arms are inclined arms, the rotation The first shortest distance from the center position of the double-row angular ball bearing in the axial direction of the shaft to the center position of the arm arranged on the double-row angular ball bearing side of the pair of arms is the total length of the blade The second shortest distance from the end of the blade in the axial direction arranged on the double row angular ball bearing side to the center position of the double row angular ball bearing is It is set to 35 to 47% of the total length of the blade, and the end in the axial direction of the blade disposed on the double row angular ball bearing side is moved to the double row angular ball bearing side of the pair of arms. The third shortest distance to the center position of the mounting position of the arranged arm with respect to the blade is set to 16 to 27% of the total length of the blade, and the total of the first shortest distance and the second shortest distance is , 50% or less of the total length of the blade.

  The vertical shaft type hydroelectric generator of the present invention can avoid a decrease in the rotational efficiency of the rotor portion while ensuring the load resistance and durability of the bearing. In addition, the weight and cost of the apparatus can be reduced.

1 is an external view showing a vertical axis wind power generator (horizontal arm type) according to an embodiment of the present invention. It is a sectional side view showing a vertical axis type wind power generator (horizontal arm type). It is a sectional side view showing a vertical axis type wind power generator (inclined arm type). It is a detailed block diagram around the angular ball bearing. It is a figure which shows the relationship between the outer diameter of a casing, and the shortest distance from the lower end of a braid | blade to an angular ball bearing. It is a figure which shows the relationship between the total efficiency of a vertical axis | shaft type wind power generator, and the arrangement position of an angular ball bearing. It is a graph which shows the examination result of the arrangement position of an angular contact ball bearing.

Embodiments of the present invention will be described below with reference to the drawings.
In addition, in each drawing, in order to make each component easy to see, the scale of dimensions may be different depending on the component.

FIG. 1 is an external view showing a vertical axis wind power generator 1 (horizontal arm type) according to an embodiment of the present invention.
FIG. 2 is a side sectional view showing the vertical axis wind power generator 1 (horizontal arm type).
FIG. 3 is a side sectional view showing the vertical axis wind power generator 2 (inclined arm type).
The standing direction of the vertical axis wind power generators 1 and 2 (the direction along the central axis C of the rotating shaft 20) is referred to as the Z direction. Further, in the Z direction, the rotor unit 10 side is referred to as + Z side, and the tower 60 side is referred to as -Z side.

  As shown in FIG. 1 and FIG. 2, a horizontal arm type vertical axis wind power generator (vertical axis fluid power generator) 1 is configured to receive wind W to rotate and to receive mechanical energy obtained by the wind turbine 5. A power generation unit 7 or the like that converts energy is provided.

The windmill 5 includes a rotor unit 10 that receives the wind W, a rotating shaft 20 that is coupled to the rotor unit 10, a casing 40 that supports the rotating shaft 20 so as to be rotatable around a central axis C via a bearing 30, and the like.
Among the wind turbines 5, a device composed of the rotary shaft 20, the bearing 30 and the casing 40 is called a shaft unit (rotary shaft device) 6.

The power generation unit 7 includes a generator 50 that generates electric power by converting mechanical energy obtained by rotating the rotating shaft 20 in the circumferential direction (around the central axis C) into electric energy.
The wind turbine 5 and the power generation unit 7 are disposed on an upper portion of a tower (post) 6 that is erected on the ground F and extends in the vertical direction.

For the rotor unit 10, for example, a gyromill type rotor is used. The rotor unit 10 includes a plurality of blades 11 formed in a rectangular plate shape or a band plate shape.
The plurality of blades 11 are arranged to extend in the vertical direction with respect to the ground F. The plurality of blades 11 are arranged around the central axis C of the rotary shaft 20 with a uniform spacing in the circumferential direction. The plurality of blades 11 are connected to the rotary shaft 20 via a plurality of arms 12 that support them. The arm 12 is connected substantially perpendicularly to the blade 11 and the rotating shaft 20.
The blade 11 is formed in a shape that generates lift when receiving the wind W. With this lift, the rotor unit 10 rotates around the central axis C of the rotary shaft 20.

The rotor unit 10 has no dependency on the wind direction. That is, the rotor portion 10 is set to a shape that can rotate around the central axis C of the rotation shaft 20 with respect to the wind W from any direction.
The windmill 5 also includes a brake unit (not shown) that stops the rotation of the rotor unit 10 (rotating shaft 20).

  As shown in FIG. 2, the rotary shaft 20 to which the rotor unit 10 is connected is arranged extending in the vertical direction so that the central axis C is perpendicular to the ground F. The rotary shaft 20 is rotatably supported with respect to the casing 40 via the bearing 30.

One end of an arm 12 having a rectangular plate shape or a band plate shape is connected to the outer peripheral surface of the rotary shaft (shaft body) 20. A plurality of arms 12 are projected from the outer peripheral surface of the rotating shaft 20 outward in the radial direction.
The arms 12 are arranged at equal intervals in the circumferential direction of the rotating shaft 20.
The blade 11 is connected to the other end of the arm 12. For one blade 11, a pair of arms 12 are provided in parallel spaced apart in the Z direction.

A bearing 30 is disposed in the vicinity of the center portion and the lower end portion of the rotating shaft 20. The rotating shaft 20 is rotatably supported with respect to the casing 40 via the bearing 30.
The bearing 30 includes a radial bearing 31 and angular ball bearings 35 and 36 that are separated from each other in the Z direction.
The radial bearing 31 is disposed at the end in the −Z direction. Specifically, the inner ring 32 of the radial bearing 31 is fixed to the lower end side of the rotary shaft 20.

Angular ball bearings (bearings) 35 and 36 are disposed at the ends in the + Z direction. Specifically, the ball rolling grooves 21 of the angular ball bearings 35 and 36 are formed side by side at the center of the rotating shaft 20.
The angular ball bearings 35 and 36 have only outer rings 37 and 38, and the inner ring is formed on the rotary shaft 20. That is, two ball rolling grooves 21 in which a plurality of balls (rolling elements) 39 roll are formed on the outer surface of the rotary shaft 20 where the angular ball bearings 35 and 36 are provided.
Each of the two ball rolling grooves 21 has an annular shape extending along the circumferential direction on the outer peripheral surface of the rotating shaft 20, and is formed in a concave curve shape that is recessed toward the central axis C.

The casing (support) 40 is formed in a multistage cylindrical shape in which the + Z side upper portion 41 is reduced in diameter than the −Z side lower portion 42. The lower portion 42 of the casing 40 is connected to the upper end portion of the tower 60.
Outer rings 37 and 38 of angular ball bearings 35 and 36 are fixed to the inner peripheral surface of the upper portion 41 of the casing 40 on the upper end side. An outer ring 33 of the radial bearing 31 is fixed to the inner peripheral surface of the upper portion 41 of the casing 40 on the lower end side. The angular ball bearings 35 and 36 are a so-called back surface combination (DB).
The angular ball bearings 35 and 36 have a plurality of balls 39 having the same diameter. The balls 39 of the angular ball bearings 35 and 36 may have a different diameter from the balls 34 of the radial bearing 31, for example, but are not limited thereto, and may have the same diameter.

  Inside the lower portion 42 of the casing 40, a generator 50, a control unit (not shown), and the like are accommodated. Moreover, the brake part (not shown) mentioned above is accommodated.

The generator 50 generates electric power by converting a rotational force (mechanical energy) obtained by the rotation of the rotor unit 10 (rotating shaft 20) into electric energy.
The generator 50 includes a magnet rotor 51 that is connected to the lower end of the rotating shaft 20 and rotates together with the rotating shaft 20, and a coil stator 52 that is disposed so as to surround the outer peripheral side of the magnet rotor 51.

With such a configuration, when the rotor unit 10 receives the wind W and rotates the rotary shaft 20 around the central axis C, the magnet rotor 51 coupled to the rotary shaft 20 also rotates around the central axis C. That is, the magnet rotor 51 rotates on the same axis (center axis C) as the rotor unit 10 and the rotating shaft 20.
Then, when the magnet rotor 51 rotates around the central axis C with respect to the coil stator 52, electromagnetic induction occurs between the magnet rotor 51 and the coil stator 52, and electric power is generated.

FIG. 3 is a side sectional view showing the vertical axis wind power generator 2 (inclined arm type).
An inclined arm type vertical axis wind power generator (vertical axis fluid power generator) 2 has substantially the same configuration as the vertical axis wind power generator 1. In the vertical axis wind power generator, the shape of the arm 15 that connects the blade 11 and the rotary shaft 20 is different from that of the arm 12 of the vertical axis wind power generator 1.

  The arm 15 is connected to the blade 11 and the rotary shaft 20 at an inclination. The mounting position of the arm 15 with respect to the blade 11 is the same as the mounting position of the arm 12 with respect to the blade 11. On the other hand, the mounting position of the arm 15 with respect to the rotating shaft 20 is different from the mounting position of the arm 12 with respect to the rotating shaft 20. The mounting position of the arm 15 with respect to the rotating shaft 20 is one place, which is substantially the center of the rotor portion 10 in the Z direction.

  About the other structure of the vertical axis | shaft wind power generator 2, since it is the same as that of the vertical axis | shaft wind power generator 1, the description is abbreviate | omitted.

Next, the positional relationship between the angular ball bearings 35 and 36, the blade 11, and the arms 12 and 15 will be described.
Below, it designs so that the total efficiency of the vertical axis type wind power generators 1 and 2 may be 20% or more. The total efficiency is an efficiency for converting wind energy into electric energy, and includes blade efficiency of the blade 11 (arm 12), mechanical efficiency of the shaft unit 6, and power generation efficiency / control efficiency of the power generation unit 7 (generator 50). Multiply value.

  As a precondition for the overall efficiency of the vertical axis wind power generators 1 and 2 to be 20% or more, the radial and thrust external forces acting on the rotor portion 10 (rotating shaft 20) are reliably ensured by the angular ball bearings 35 and 36. Need to be supported. That is, the angular ball bearings 35 and 36 are required to have sufficient load resistance and durability.

  Further, in order to increase the overall efficiency of the vertical axis wind power generators 1 and 2 to 20% or more, the side surface of the casing 40 occupies the wind receiving area of the rotor portion 10 (the total length L of the blade 11 × the diameter D of the rotor portion 10). It is required to reduce the ratio of the projected area. In order to reduce the side projection area of the casing 40, it is necessary to reduce the outer diameter E of the casing 40, that is, to reduce the outer diameters of the angular ball bearings 35 and 36.

The projected area of the side surface of the casing 40 is multiplied by the outer diameter E of the casing 40 and the length in the Z direction of the region overlapping the rotor portion 10 when the casing 40 is viewed from the side surface direction (direction orthogonal to the Z direction). It is an area.
The outer diameter E of the casing 40 means the outer diameter of the upper portion 41, but may be an outer diameter including a reinforcing rib 43 provided at a connection portion between the upper portion 41 and the lower portion 42. This is because the lower end 11b of the blade 11 may be located at substantially the same height (position in the Z direction) as the connecting portion of the upper portion 41 and the lower portion 42. That is, when the casing 40 is viewed from the side surface direction (direction orthogonal to the Z direction), the maximum outer diameter of the region overlapping the rotor portion 10 is the outer diameter E.

In order for the angular ball bearings 35, 36 to maintain sufficient load resistance and durability while reducing the outer diameter of the angular ball bearings 35, 36, the external force acting on the angular ball bearings 35, 36 is reduced. Good. That is, it is important to make the angular ball bearings 35 and 36 as close as possible to the rotor portion 10 (arm 12).
Thus, by making the angular ball bearings 35 and 36 close to the rotor portion 10, the outer diameters of the angular ball bearings 35 and 36 can be set small.

FIG. 4 is a detailed configuration diagram around the angular ball bearings 35 and 36.
In the Z direction, the shortest distance H1 (first shortest distance) between the angular ball bearings 35, 36 and the arms 12, 15 of the rotor portion 10 is at least 3 based on the total length L of the blade 11 due to mechanical limitations. % (0.03L) or more is required (see the straight line T1 in FIG. 7). This is because members such as the arm fixing member 25 for fixing the blade 11 to the rotating shaft 20 and the bearing retainer 45 for defining the positions of the angular ball bearings 35 and 36 are required.

Further, the shortest distance H1 is theoretically 50% (0.5 L) or less based on the total length L of the blade 11 (see the straight line T2 in FIG. 7).
In addition, the arrangement | positioning position of the angular ball bearings 35 and 36 means the center position of the angular ball bearings 35 and 36.

  FIG. 5 is a diagram showing the relationship between the outer diameter of the casing 40 and the shortest distance H2 from the lower end 11b of the blade 11 to the angular ball bearings 35 and 36. The vertical axis indicates the ratio of the outer diameter E of the casing 40 to the outer diameter D of the rotor portion 10. The horizontal axis indicates the ratio of the shortest distance H2 from the lower end 11b of the blade 11 to the angular ball bearings 35, 36 with respect to the total length L of the blade 11.

  In the Z direction, the external force acting on the angular ball bearings 35, 36 becomes smaller as the positions of the angular ball bearings 35, 36 are closer to the center of the rotor portion 10 (blade 11). In other words, in the Z direction, the outer diameter of the angular ball bearings 35, 36 is increased as the shortest distance H2 (second shortest distance) from the lower end (end portion) 11b of the blade 11 to the angular ball bearings 35, 36 is shorter. There is a need. For this reason, the ratio of the side projection area of the casing 40 in the wind receiving area of the rotor unit 10 is increased, and the overall efficiency of the vertical axis wind power generators 1 and 2 is reduced.

As shown in FIG. 5, in the vertical axis wind power generators 1 and 2, when the shortest distance H2 is less than 5% ( 0.05 L) based on the total length L of the blade 11, the outer diameter E of the casing 40 is reduced. It exceeds 20% (0.2D) on the basis of the diameter D of the rotor part 10. For this reason, the overall efficiency of the vertical axis wind power generators 1 and 2 is greatly reduced.
Therefore, in order not to reduce the overall efficiency of the vertical axis wind power generators 1 and 2, the outer diameter E of the casing 40 is set to be 20% (0.2 D) or less with respect to the diameter D of the rotor portion 10. To do. Therefore, the shortest distance H2 is 5% (0.05L) or more based on the total length L of the blade 11 (see the straight line T3 in FIG. 7).

  FIG. 6 is a diagram showing the relationship between the overall efficiency of the vertical axis wind power generators 1 and 2 and the arrangement positions of the angular ball bearings 35 and 36. The vertical axis represents the overall efficiency of the vertical axis wind power generators 1 and 2. The horizontal axis indicates the ratio of the shortest distance H2 from the lower end 11b of the blade 11 to the angular ball bearings 35, 36 with respect to the total length L of the blade 11.

The overall efficiency of the vertical axis type wind power generators 1 and 2 is determined by the diameter and weight of the rotating shaft 20 determined by the positions of the angular ball bearings 35 and 36, the size (outer diameter) of the angular ball bearings 35 and 36, and the machine of the shaft unit 6. The calculation was made based on the efficiency, the blade efficiency of the blade 11, and the like.
The calculation was made assuming that the diameter of the rotor 10 is 3 m and the total length of the blade 11 is 3 m.
The cross-sectional shape of the arm 12 was set to a wing shape like the blade 11. For example, a NACA0012 airfoil is used as the airfoil shape.
The cross-sectional shape of the arm 15 was set to be rectangular or round.

  In order for the overall efficiency of the horizontal arm type vertical axis wind power generator 1 to be 20% or more, the shortest distance H2 (second shortest distance) from the lower end 11b of the blade 11 to the angular ball bearings 35 and 36 is the blade 11. It is necessary to set it to be 10% (0.1 L) or more with reference to the total length L (see straight line T4 in FIG. 7).

  Increasing the shortest distance H2 also increases the overall efficiency of the vertical axis wind power generator 1. However, due to mechanical restrictions (restrictions caused by the upper limit of the shortest distance H3 described later), the shortest distance H2 is the total length L of the blade 11. 24% (0.24L) cannot be exceeded (see straight line T5 in FIG. 7).

In order for the overall efficiency of the inclined arm type vertical axis wind power generator 2 to be 20% or more, the shortest distance H2 (second shortest distance) from the lower end 11b of the blade 11 to the angular ball bearings 35, 36 is the blade 11. It is necessary to set it to be 35% (0.35 L) or more with reference to the total length L of. (See straight line S4 in FIG. 7).
Increasing the shortest distance H2 increases the overall efficiency of the vertical axis wind power generator 2, but the shortest distance H2 is based on the total length L of the blade 11 due to mechanical restrictions (restrictions caused by the lower limit of the shortest distance H1). 47% (0.47L) cannot be exceeded (see the straight line S5 in FIG. 7).

One blade 11 is supported at two points by two arms 12 and 15. A load is evenly applied to the blade 11 (uniformly distributed load).
Since it is necessary to make the bending moment applied to the blade 11 as small as possible to reduce the weight and the cost, the mounting positions of the two arms 12 and 15 with respect to the blade 11 are inevitably determined. Specifically, the shortest distance H3 of the from the lower end 11b of the blade 11 to the mounting position of the arm 12 and 15, based on the overall length L of the blade 11 16 ~27% (0. 16 ~0.27L) in the range of Need to be provided.

  In the vertical axis wind power generator 1, the arm 12 is arranged perpendicular to the blade 11 and the rotating shaft 20, and therefore, when the range of the shortest distance H3 from the lower end 11 b of the blade 11 to the mounting position of the arm 12 is determined. Naturally, the range of the shortest distance H2 from the lower end 11b of the blade 11 to the angular ball bearings 35 and 36 is also determined (see straight lines T6 and T7 in FIG. 7).

  On the other hand, in the vertical axis type wind power generator 2, even if the range of the shortest distance H3 is determined, the inclination angle of the arm 15 with respect to the blade 11 and the rotary shaft 20 may be changed, so the range of the shortest distance H2 is affected. Absent.

FIG. 7 is a graph showing the examination results of the arrangement positions of the angular ball bearings 35 and 36.
The vertical axis represents the ratio of the shortest distance H1 from the arms 12, 15 to the angular ball bearings 35, 36 to the total length L of the blade 11. The horizontal axis indicates the ratio of the shortest distance H2 from the lower end 11b of the blade 11 to the angular ball bearings 35, 36 with respect to the total length L of the blade 11.

In the horizontal arm type vertical axis wind power generator 1, when the above-described examination results are shown on a graph, seven straight lines T1 to T7 are drawn.
The straight line T1 is the minimum value of the shortest distance H1, and is 3% L (0.03L).
A straight line T2 indicates a theoretical upper limit value of the shortest distance H1.
The straight line T3 is the minimum value of the shortest distance H2 for reducing the outer diameter E of the casing 40 to 20% D (0.2D) or less, and is 5% L (0.05 L).
The straight line T4 is the minimum value of the shortest distance H2 for setting the total efficiency to 20% or more, and is 10% L (0.1 L).
The straight line T5 is the maximum value of the shortest distance H2 for making the total efficiency 20% or more, and is 24% L (0.24L).
A straight line T6 indicates a lower limit value of the shortest distance H3 from the lower end 11b of the blade 11 to the attachment position of the arm 12.
Straight line T7: An upper limit value of the shortest distance H3 from the lower end 11b of the blade 11 to the mounting position of the arm 12 is shown.

In the vertical axis type wind turbine generator 1, an area A <b> 1 surrounded by the straight lines T <b> 1 to T <b> 7 is an optimal arrangement position of the angular ball bearings 35 and 36. More precisely, the presence of the center positions of the angular ball bearings 35, 36 in the region A1 surrounded by the straight lines T1, T4, T6, T7 is the optimum arrangement position of the angular ball bearings 35, 36.
More preferably, the angular ball bearings 35 and 36 are disposed near the center of the region A1 surrounded by the straight lines T1, T4, T6, and T7.

Thus, in the vertical axis type wind power generator 1, the shortest distance H1 is 3% L to 17 % L, the shortest distance H2 is 10% L to 24 % L, and the outer diameter E of the casing 40 is 20% D (0. 2D) It is preferable to design so that it becomes the following.
More preferably, in the vertical axis wind power generator 1, the shortest distance H1 is 5% L to 10% L, the shortest distance H2 is 13% L to 18% L, and the outer diameter E of the casing 40 is 20% D (0. 2D) It is preferable to design so that it becomes the following.

On the other hand, in the inclined arm type vertical axis wind power generator 2, when the above-described examination result is shown on the graph, five straight lines T1 to T3, S4, and S5 are drawn.
The straight lines T1 to T3 are as described above.
The straight line S4 is the minimum value of the shortest distance H2 for setting the total efficiency to 20% or more, and is 35% L (0.35 L).
The straight line S5 is the maximum value of the shortest distance H2 for setting the total efficiency to 20% or more, and is 47% L (0.47 L).

In the vertical axis type wind turbine generator 2, an area A <b> 2 surrounded by the straight lines T <b> 1 to T <b> 3, S <b> 4, S <b> 5 is an optimal arrangement position of the angular ball bearings 35, 36. More precisely, the presence of the center positions of the angular ball bearings 35, 36 in the region A2 surrounded by the straight lines T1, T2, S4 is the optimum arrangement position of the angular ball bearings 35, 36.
More preferably, the angular ball bearings 35 and 36 are arranged near the center of the region A2 surrounded by the straight lines T1, T2 and S4.

Thus, in the vertical axis type wind power generator 2, the shortest distance H1 is 3% L to 15% L, the shortest distance H2 is 35% L to 47% L, and the outer diameter E of the casing 40 is 20% D (0. 2D) It is preferable to design so that it becomes the following.
More preferably, in the vertical axis wind power generator 2 , the shortest distance H1 is 5% L to 10% L, the shortest distance H2 is 40% L to 45% L, and the outer diameter E of the casing 40 is 20% D (0. 2D) It is preferable to design so that it becomes the following.

  In the vertical axis wind power generators 1 and 2, the arrangement positions of the angular ball bearings 35 and 36 that support the rotating shaft 20 are optimized. Thus, the vertical axis wind power generators 1 and 2 can avoid a decrease in the rotational efficiency of the rotor unit 10 while sufficiently securing the load resistance and durability of the angular ball bearings 35 and 36. That is, the outer diameter E of the casing 40 can be reduced. Moreover, weight reduction and cost reduction of the vertical axis wind power generators 1 and 2 can be achieved.

  Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are merely examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

For example, in the above-described embodiment, the vertical axis wind power generators 1 and 2 that rotate the rotor unit 10 using the wind W as the working fluid have been described as the vertical axis fluid power generator. However, the present invention is not limited to this.
It may be a vertical axis hydroelectric generator that rotates water turbine (impeller) using water as a working fluid. That is, the same effect can be obtained even when the rotor unit 10 is submerged in the water of the irrigation channel and used as a hydroelectric power generation device in which the power generation unit 7 and the like are provided on the water.

  Angular contact ball bearings 35 and 36 may be front alignment or parallel alignment other than back alignment.

  The balls 34 and 39 are used as the rolling elements of the radial bearing 31 and the angular ball bearings 35 and 36. However, the present invention is not limited to this. For example, a roller or the like may be used as the rolling element.

  The rotor unit 10 is not limited to the gyromill type. That is, other Darrieus type, straight wing type, Savonius type, paddle type, cross flow type, S type rotor type and the like may be used.

  DESCRIPTION OF SYMBOLS 1, 2 ... Vertical axis | shaft type wind power generator (vertical axis type fluid power generator), 10 ... Rotor part, 11 ... Blade, 11b ... Lower end (end part) 12, 15 ... Arm, 20 ... Rotating shaft, 35, 36 ... Angular contact ball bearing (bearing), 40 ... Casing (support), L ... Full length, D ... Diameter, E ... Outer diameter, H1 ... Shortest distance (first shortest distance), H2 ... Shortest distance (second shortest distance)

Claims (3)

A rotating shaft connected via a pair of arms to which a plurality of blades are attached to each other in the axial direction ; and
A support that rotatably supports the rotating shaft via a plurality of bearings;
A vertical axis hydroelectric generator comprising:
The bearing includes a double row angular ball bearing,
When the pair of arms are horizontal arms,
Said first shortest distance to the center position of the arm arranged in angular contact ball bearing side of the double row of from the center of the angular contact ball bearing of the double row in the axial direction of the rotating shaft the pair of arms, said blade been set to 3-17% of the total length,
The second shortest distance from the end of the blade on the double row angular contact ball bearing side in the axial direction to the center position of the double row angular contact ball bearing is 10 to 24% of the total length of the blade. Set,
A center position of an attachment position of the arm disposed on the double-row angular ball bearing side of the pair of arms from an end portion of the blade disposed on the double-row angular ball bearing side in the axial direction with respect to the blade. The vertical axis type hydroelectric generator is characterized in that the third shortest distance is set to 16 to 27% of the total length of the blade . A rotating shaft connected via a pair of arms to which a plurality of blades are attached to each other in the axial direction; and
A support that rotatably supports the rotating shaft via a plurality of bearings;
A vertical axis hydroelectric generator comprising:
The bearing includes a double row angular ball bearing,
When the pair of arms are inclined arms,
The first shortest distance from the center position of the double row angular ball bearing in the axial direction of the rotating shaft to the center position of the arm arranged on the double row angular ball bearing side of the pair of arms is the blade 3-15% of the total length of
A second shortest distance from an end portion of the blade disposed on the double row angular ball bearing side in the axial direction to a center position of the double row angular ball bearing is 35 to 47% of the total length of the blade. Set,
A center position of an attachment position of the arm disposed on the double-row angular ball bearing side of the pair of arms from an end portion of the blade disposed on the double-row angular ball bearing side in the axial direction with respect to the blade. The third shortest distance is set to 16 to 27% of the total length of the blade,
The vertical axis type fluid power generation device according to claim 1, wherein a total of the first shortest distance and the second shortest distance is 50% or less of a total length of the blade. 3. The vertical axis hydroelectric generator according to claim 1 , wherein an outer diameter of the support is set to 20% or less of a diameter of a rotor portion formed by the blade.

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