JP2016169703A - Aseismic base isolation vertical shaft windmill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a support frame of a vertical shaft windmill, in which rotors are arranged in the shape of a plurality of laminar layers, and an aseismic base isolation vertical windmill for suppressing the vibrations of the vertical main axis, which accompany the rotations of the rotor.SOLUTION: In an aseismic base isolation vertical shaft windmill 1 having a plurality of lateral frames 3, at the central portion of a support frame body 4 assembled in a solid by a plurality of columnar bodies 2, a rotor 13 is fixed on one vertical main shaft 11 vertically supported, and the lower end part of the vertical main shaft 11 is connected to an electric generator 5. In the windmill thus constructed, the upper end part of the vertical main shaft 11 is supported by ordinary means. The quakes of the vertical main shaft 11 accompanying the rotations occur at a lower part around the upper end part. The electric generator 5 is supported through aseismic base means 9 on a base G so that the entire vibrations are suppressed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a seismic isolation vertical axis wind turbine, and more particularly to a seismic isolation vertical axis wind turbine that suppresses the vibration of a support frame that occurs when the vertical axis wind turbine rotates, thereby increasing the rotational efficiency of a rotor.

  Patent Documents 1 and 2 disclose vertical axis wind turbines in which rotors are arranged in a multilayer shape on a high-layer support frame.

JP 2006-118384 A JP 2006-017011 A

In the invention described in Patent Document 1, a plurality of rotors are arranged in multiple layers on one longitudinal main shaft supported by a support frame.
In the invention described in Patent Document 2, a plurality of rotors are arranged in a multilayered manner on a single longitudinal main shaft supported by a support frame, and a deflection preventing means is applied to the longitudinal main shaft.
In these inventions, the rotational efficiency of the rotor is high and excellent even in light winds, and if the support frame is tensioned from four sides with a wire rope or the like and fixed and held, the entire support frame is caused by the centrifugal force accompanying the rotation of the rotor. Even if it vibrates, it is possible to prevent the wire rope from loosening to some extent. However, there is an urgent need for a method for suppressing the vibration of the entire support frame.
The present invention aims to solve this problem.

  The specific contents of the present invention are as follows.

  (1) A rotor is fixed to one vertical main shaft that is vertically supported at a central portion of a support frame body in which a plurality of horizontal frame bodies are three-dimensionally assembled with a plurality of pillars, and a lower end portion of the vertical main shaft is In the wind turbine connected to the generator, the upper end of the vertical main shaft is normally supported, and the vertical main shaft vibration accompanying the rotation is that the lower portion vibrates around the upper end, and the generator is A base-isolated vertical wind turbine that is supported by the base and suppresses the overall vibration.

  (2) The seismic isolation vertical wind turbine according to (1), wherein the upper part of the generator to which the vertical main shaft is coupled is supported by a foundation horizontal frame body via a seismic isolation means.

(3) The horizontal frame is assembled in a frame shape with a plurality of frame members in plan view, and a bearing for supporting the vertical main shaft at the center is fixed to the central portion via a support rod. The seismic isolation vertical wind turbine according to (1), which is fixed.

  (4) The bearing that supports the longitudinal main shaft is any of an angular ball bearing, a self-aligning ball bearing, a combination thereof, a combination with other rolling bearings, and the like. The seismic isolation vertical axis windmill according to any one of the above.

  (5) The support frame body according to any one of (1) to (4), wherein a vibration is absorbed by an elastic inclined column fixed to the column body provided at the corner from the outside. The seismic isolation vertical axis windmill described in 1.

  (6) The seismic isolation vertical axis wind turbine according to any one of (1) to (5), wherein the elastic inclined column is an L-shaped steel material and is attached to the column of the support frame with a convex portion facing outward.

  According to the present invention, the following effects can be obtained.

In the invention described in (1) above, since the generator connected to the lower end of the longitudinal main shaft is supported by the base via the seismic isolation means, even if the longitudinal main shaft vibrates during rotation, the vibration is not The support frame body, which is absorbed by the seismic isolation means and supports the longitudinal main shaft, is prevented from shaking.
That is, when the upper part of the vertical axis vibrates, the whole amplifies the vibration, so the upper end of the vertical main shaft is supported and fixed by a normal horizontal frame that does not use seismic isolation means, That is, even if the vertical main shaft vibrates, the lower part will vibrate around the fixed upper end, and the generator absorbs the vibrations by the seismic isolation means, so the whole vibration is suppressed, The upper part of the support frame is prevented from shaking.

  In the invention described in (2) above, since the upper part of the generator is supported by the foundation horizontal frame body via the seismic isolation means, the vibration generated with the rotation of the longitudinal main shaft is absorbed, and the foundation The vibration is difficult to be transmitted to the part.

  In the invention described in (3), the horizontal frame that supports the longitudinal main shaft is constructed by framing the frame material into a frame shape in plan view, and the seismic isolation means is fixed to the center via a support rod. Since the bearing that supports the vertical main shaft is fixed in the center, even if the inner frame vibrates via the bearing, the vibration is absorbed by the seismic isolation means on the outer side, so the support frame The vibration is suppressed.

  In the invention described in (4) above, the bearing that supports the longitudinal main shaft is either an angular ball bearing, a self-aligning ball bearing, or a combination thereof, or a combination with other rolling bearings. By using bearings suitable for the model, local wind conditions, etc., an efficient seismic isolation vertical wind turbine can be obtained.

  In the invention described in (5), since the elastic inclined column is fixed to the column at the corner of the support frame from the outside, the elastic inclined column is supported even if the support frame is subjected to the vibration of the longitudinal main shaft. Will be bent by itself and the vibration of the support frame will be suppressed.

  In the invention described in the above (6), the elastic inclined column uses L-shaped steel material and is attached to the column of the support frame body with the convex portion facing outward. Therefore, even a lightweight, long type material is excellent in elasticity. Excellent workability.

It is a front view of one embodiment of the present invention. It is a top view of the seismic isolation horizontal frame in FIG. FIG. 3 is a cross-sectional plan view taken along line III-III in FIG. 1. It is a top view of the basic part in FIG. It is a principal part front view of Example 2 of the seismic isolation means of this invention.

  The present invention will be described below with reference to the drawings.

As shown in FIG. 1, the vertical wind turbine 1 includes a three-dimensional support frame 4 in which a plurality of horizontal frames 3, 3 </ b> A, and 3 </ b> B are combined in layers by a plurality of pillars 2 and 2.
Although the support frame 4 is formed of a plurality of frame members in a square frame shape in plan view, the horizontal frame 3 may be circular or annular in plan view. Four column bodies 2 are used to connect a plurality of horizontal frame bodies 3, but it is possible to use three column bodies 2, and the number is not limited.

  When a long object is used as the column 2, for example, an L-shaped steel material is attached from the outside to the column 2 of the shape steel at the four corners of the horizontal frame 3 with the convex portions facing outward, and bolted. . When a short rod is used as the column body, it is fitted with the column attachment portions 3c at the four corners of the horizontal frame 3 and bolted.

In FIG. 1, the base G is cement concrete and fixes the base pillar 2 </ b> A.
The seismic isolation means 6 that supports the generator 5 is configured by disposing a plurality of arbitrary elastic bodies 6B such as earthquake-proof rubber and coil springs under the support base 6A.
A fixed inclined column 7 for supporting the support frame 2 from the outside and an elastic inclined column 8 are fixed with bolts 19 outside the basic column 2A.

  As shown in FIG. 2, the horizontal frame 3 </ b> A in the middle of the support frame 4 is composed of a vertical frame member 3 a and a horizontal frame member 3 b that are integrally formed in a square shape in plan view. Sometimes. In the center, the seismic isolation means 9 is supported by a plurality of support rods 10 to form a seismic isolation horizontal frame 3A. Column mounting portions 3c for fitting the column bodies 2 to the four corner portions are projected.

  As shown in FIG. 2, the seismic isolation means 9 is configured by supporting an inner frame 9B through an elastic body 9C in an outer frame 9A. A bearing 12 that supports the vertical main shaft 11 is fitted inside the inner frame 9B.

  The elastic body 9C of the seismic isolation means 9 is, for example, an elastic anti-vibration rubber, and is capable of dealing with vibrations from all directions, for example, 5 pieces are directed from the inner frame body 9B in the radial direction, and the inner side of the outer frame body 9A. It is arranged. The vibration generated in the longitudinal main shaft 11 and applied to the inner frame body 9B is absorbed by the elastic body 9C, and the vibration is not easily transmitted to the support frame body 4.

  A lower end portion of the vertical main shaft 11 is connected to the generator 5. A foundation horizontal frame 3B is horizontally fixed on the four foundation pillars 2A. As shown in FIG. 3, the basic horizontal frame 3 </ b> B is composed of a vertical frame member 3 a and a horizontal frame member 3 b in a square shape in a plan view, but a semicircular arc shaped frame member has an annular shape in a plan view. It can also be.

A support ring body 10A, which is larger than the diameter of the generator 5, is fixed to the inner central portion of the base horizontal frame body 3B via a plurality of horizontal support rods 10.
Even if the generator 5 is vibrated by the vibration of the longitudinal main shaft 11 by interposing an elastic body (for example, earthquake-proof rubber) of the seismic isolation means 9A between the support ring 10A and the generator 5, the support frame 4 It is made not to be transmitted to.

  The vertical main shaft 11 is rotatably supported at its upper end by a bearing 12 of the horizontal frame 3 disposed at the upper end of the support frame 4. Since the bearing is not provided with seismic isolation means, it has a role of fixing the longitudinal main shaft 11 at a specific position. Even if the vertical main shaft 11 is vibrated by the rotation of the rotor 13, the lower portion of the vertical main shaft 11 vibrates around the horizontal frame 3 on the top of the support frame 4.

  It is more preferable to use an angular ball bearing or a self-aligning ball bearing as the bearing. The angular ball bearing can receive an axial load caused by the vibration of the vertical spindle 11, and the self-aligning ball bearing is automatically adjusted even if the inner frame 9B of the seismic isolation means 6 is tilted, and the vertical spindle 11 It is possible to prevent misalignment of the axis.

  Since the lower part of the vertical main shaft 11 is connected to the generator 5 supported by the seismic isolation means 9A, even if the lower part of the vertical main shaft 11 vibrates, it is absorbed by the seismic isolation means 9A. The upper part of is hard to shake.

  In addition, the outer corners of the upper part of the support frame 4 are restrained from being vibrated by the four elastic slant struts 8 at the upper corners. Vibration is suppressed.

A rotor 13 is disposed on the vertical main shaft 11 with a certain interval in the vertical direction.
The rotor 13 has a vertically long lift type blade 14 (hereinafter simply referred to as a blade) mounted on the vertical main shaft 11 via a support arm 15 having upper and lower ends inclined portions 14A inclined in the direction of the vertical main shaft 11. The mounting plate 16 is detachably fixed.

  The blades 14 are arranged symmetrically with respect to the longitudinal main shaft 11. The number of blades 14 is not limited. However, when the number of blades is large, the following blade 14 receives the turbulent air flow generated by the preceding blade 14 during high-speed rotation, and as a whole stalls.

  When there is one blade 14, the rotational balance with respect to the longitudinal main shaft 11 is not good, which causes vibration. When the rotor 13 is arranged in a multilayer on the vertical main shaft 11, the phases of the blades 14 are changed in a balanced manner so that the upper and lower blades 14 do not overlap.

  The rotor 13 is arranged in three layers in FIG. 1, but if the number of layers is increased, the speed of the airflow is different between the upper and lower rotors, and therefore the rotational speed is likely to be different between the upper and lower rotors 13. In a place where the base G is high and a relatively high-speed wind blows, the three-layer arrangement of the rotor 13 performs efficient high-speed rotation.

  The blade 14 has a long chord length, a large wind receiving area, and high rotation efficiency. Along with the rotation, the relative flow that hits the leading edge of the blade 14 flows in the direction of the trailing edge along the inner and outer surfaces, and negative pressure is generated on the outer surface due to the Coanda effect. , Suctioned outward, the inner surface of the blade 14 is pushed outward from the front edge, and the rotational efficiency is increased.

  Further, when the rotor 13 rotates at a high speed, the rotational peripheral speed of the outer surface of the blade 14 is larger than the portion close to the vertical main shaft 11 portion, so that the gas rotating along the outer surface is caused by the viscosity of the fluid. The air pressure in the rotation trajectory of the blade 14 is drawn in the outward direction, resulting in a negative pressure inside.

  As a result, the surrounding airflow other than the wind flow is sucked into the rotation trajectory that becomes this negative pressure, the amount of the airflow is relatively increased, the rotational efficiency of the rotor 13 is increased, and the blade 14 has a speed higher than the wind speed. Rotates with speed.

  Therefore, even if the support frame 4 is formed robustly, the longitudinal main shaft 11 vibrates due to the centrifugal force accompanying the high-speed rotation of the blade 14, and the support frame 4 that supports this vibrates. Even if the body 4 is tightly tensed, the main spindle 11 may be loosened, the vibration may be transmitted from the base G to another place, and a low frequency may be generated.

However, in FIG. 1, since the upper end of the vertical main shaft 11 is supported by the seismic isolation horizontal frame 3 </ b> A via the seismic isolation means 9, the vibration due to the high-speed rotation of the rotor 13 occurs. However, the vibration is absorbed by the seismic isolation means 9 and the vibration of the support frame 4 is suppressed.
The seismic isolation horizontal frame 3A provided with the seismic isolation means 9 may be applied to other horizontal frames 3 and 3B other than the top.

In the wind turbine in which the vertical main shaft 11 is erected from the generator 5 arranged on the base G, the vibration of the vertical main shaft 11 causes the base G to vibrate via the generator 5.
In FIG. 1, an elastic body 6B made of a known seismic rubber or a coil spring or the like is disposed on a base G under a support base 6A on which a generator 5 is placed. ing.

As a result, even if the vibration associated with the rotation of the longitudinal main shaft 11 is transmitted to the generator 5, the vibration is absorbed by the seismic isolation means 6, so that the propagation of the vibration to the base G is suppressed.
In this case, if the other horizontal frame 3 is provided with the seismic isolation means 9 in the same manner as the seismic isolation horizontal frame 3A, the effect of suppressing the vibration on the longitudinal main shaft 11 becomes large.

  Since the foundation horizontal frame body 3B is supported by the fixed inclined support column 7 from four directions, the foundation portion of the support frame body 4 is hard to vibrate and is firm. With respect to the upper layer portion of the support frame 4, the elastic inclined support columns 8 are fixed at the four corners, so that the vibration is absorbed and the vibration is suppressed.

The elastic inclined column 8 is set so as to bend inward from the lower end portion to the upper end portion, and the upper end portion leans against the support frame body 4. When the support frame body 4 vibrates, the elastic inclined column 8 is deflected in the horizontal direction corresponding to the intensity of the vibration, and the vibration is absorbed.
Further, when the elastic inclined support column 8 is made of, for example, an L-shaped steel material and the convex portion is used outward, it is difficult to bend outwardly, so that even a long object can be handled.

  As described above, in the base portion of the support frame 4, the base horizontal frame 3 </ b> B, the base column 2 </ b> A, and the fixed inclined column 7 are firmly framed, and the support frame 4 fixed integrally therewith. In addition, the vibration is suppressed by the plurality of elastic inclined columns 8 fixed to the outside.

  The generator 5 erected on the vertical main shaft 11 is also supported by the base G by the seismic isolation means 6, and the upper end of the vertical main shaft 11 is also suppressed by the seismic isolation means 9 of the seismic isolation horizontal frame 3A. Even if 13 rotates at high speed, the seismic isolation vertical wind turbine 1 is less likely to cause vibration of the support frame 4 and the longitudinal main shaft 11.

FIG. 5 is a front view showing Example 2 of the seismic isolation means. The same members as those of the previous example are denoted by the same reference numerals and description thereof is omitted.
In FIG. 5, the support frame 4 in FIG. 1 is omitted.

In FIG. 5, the generator 5 is supported on the base G through the seismic isolation means 6. The seismic isolation means 6 is configured by installing an elastic body 6B made of earthquake-proof rubber under the support base 6A of the generator 5.
A vertical main shaft 11 is supported on the bearing 12 of the bearing of the top horizontal frame 3.

  In the foundation horizontal frame body 3B, since the upper part of the generator 5 is supported from the periphery by the elastic body 9A, the vibration in the generator is absorbed. When the seismic isolation means is used for the bearing of the horizontal frame 3 on the top of the support frame 4, an elastic low repulsion unit is used.

In the present invention, since the lower end portion of the generator 5 supporting the vertical main shaft 11 is supported by the seismic isolation means 6B, the vibration of the vertical main shaft 11 caused by the high-speed rotation of the rotor 13 is seismic isolation. Absorbed by means 6B.
Since the vibration of the support frame 4 and the resulting rotation loss of the rotor 13 can be mitigated, a wind turbine with high rotational efficiency can be formed, and a wind power generator that can generate electric power with high efficiency can be obtained.

1. 1. Seismic isolation vertical axis windmill Column 2A. 2. Basic column body Horizontal frame 3A. Seismic isolation frame 3B. Basic horizontal frame 3a. Vertical frame 3b. Horizontal frame material 3c. 3. Column mounting part 4. Support frame body Generator 6. Seismic isolation means 6A. Support base 6B. Elastic body 7. Fixed inclined column 8. 8. Elastic slant struts Seismic isolation means 9A. Outer frame 9B. Inner frame 9C. Elastic body 9D. Seismic isolation means
10.Supporting cage
10A. Support ring
11． Vertical spindle
12． bearing
13. Rotor
14. Lift type blade
14A. Slope
15． Support arm
16． Mounting plate
17-19. Bolt G. Foundation

Claims (6)

The rotor is fixed to one vertical main shaft that is vertically supported at the center of a support frame that is a three-dimensional assembly of a plurality of horizontal frames, and the lower end of the vertical main shaft is a generator. In the wind turbine connected to the vertical axis, the upper end of the vertical main shaft is supported by normal means, and the vibration of the vertical main shaft accompanying rotation is assumed to vibrate in the lower part centering on the upper end. The seismic isolation vertical wind turbine is characterized in that it suppresses the overall vibration. The seismic isolation vertical wind turbine according to claim 1, wherein an upper portion of the generator to which the vertical main shaft is coupled is supported by a foundation horizontal frame body via a seismic isolation means. The horizontal frame is assembled in a frame shape with a plurality of frame members in a plan view, and a seismic isolation means is fixed to the center via a support rod, and a bearing that supports the vertical main shaft is fixed to the center. The seismic isolation vertical axis windmill according to claim 1 or 2, wherein The bearing for supporting the longitudinal main shaft is any one of an angular ball bearing, a self-aligning ball bearing, a combination thereof, a combination with another rolling bearing, and the like. The seismically isolated vertical axis windmill described in Crab. 5. The support frame according to any one of claims 1 to 4, wherein a vibration is absorbed by an elastic inclined column fixed from the outside to a column provided at a corner of the support frame. The seismically isolated vertical axis windmill. The seismic isolation vertical axis windmill according to any one of claims 1 to 5, wherein the elastic inclined column is an L-shaped steel material and is attached to a column of a support frame with a convex portion facing outward.

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