JP2007009898A - Wind power generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wind power generator, provided with a variable blade pitch mechanism, which can be manufactured at low cost and easily. <P>SOLUTION: To an inclination surface 14a of a support arm 14 radially provided on a hub 11, a blade 13 is connected through an inclination hinge mechanism 50 comprising a first hinge joint and a second hinge joint. A first rotation axis 52A of the first hinge joint is inclined to the length direction of the support arm 14. The first rotation axis of the first hinge joint and a second rotation axis 56A of the second hinge joint are in twisted position relation with each other. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a wind power generator. In particular, the present invention relates to a wind turbine generator having a mechanism that changes the pitch (tilt) of blades using a centrifugal force.

  Wind power generators use natural energy and are very excellent in terms of the environment. However, the equipment that is currently operated or planned is expensive to construct, including maintenance and operation costs. Therefore, it is only used in regions where the annual wind energy density is particularly high in order to make the profits from power generation economically commensurate.

  For this reason, wind turbines are operated only in a very limited and narrow area of the country, and most of the remaining low wind energy density areas are economical in spite of the fact that large wind energy can be obtained in the entire area. Since it is not balanced, it has not been put into operation.

  The main factor that makes wind power generators expensive is that the structure of the rotational speed adjusting device as a countermeasure against the strong wind of the impeller is complicated.

  As the rotation speed adjusting device, a variable pitch method is generally adopted in which the inclination of the blade is changed with respect to the wind direction.

  The variable pitch mechanism for adjusting the rotational speed of modern wind power generators has an electric control device and a hydraulic control device incorporated in the hub of the impeller, which requires a complicated structure and high precision and strength. Therefore, the cost of manufacturing and maintaining the apparatus is expensive.

  On the other hand, a variable pitch method has been conventionally proposed in which a centrifugal force generated in a blade when the impeller rotates is used as a driving force for changing the pitch of the blade. One of these methods is a helical feathering method.

  FIG. 1 is an explanatory diagram showing a schematic configuration of a helical feathering system (see, for example, Non-Patent Document 1). A cylindrical support shaft 9 extends radially from the hub 11 of the impeller. A cylindrical spar 4 is slidably inserted into the support shaft 9 on the outer surface of the support shaft 9. A pin 4 a formed on the outer peripheral surface of the support shaft 9 is fitted in a spiral groove 7 formed in the spar 4. A blade 2 is connected to the spar 4. The blade 2 is urged in the direction of the hub 11 by a spring 6 against centrifugal force.

When the wind 5 is received, the impeller rotates in the direction of arrow 8 about the impeller shaft 10. At this time, centrifugal force 3 is generated in the blade 2. As the rotation speed of the hub 11 increases, the centrifugal force 3 generated in the blade 2 also increases. When the centrifugal force 3 exceeds the urging force of the centrifugal force countering spring 6, the spring 6 is extended and the spar 4 moves in the direction of the centrifugal force 3 with respect to the support shaft 9. At this time, since the pins 4 a move along the grooves 7, the pitch of the blades 2 changes in the direction of the arrow 1. As the rotational speed of the impeller increases, the centrifugal force 3 increases, the blade 2 moves away from the hub 11, and the pitch change amount of the blade 2 increases. In this way, the angle formed by the direction of the blade 2 and the direction of the wind 5 is reduced during a strong wind to prevent the wind pressure acting on the blade 2 from becoming excessive.
Co-authored by Ushiyama Izumi and Masahiro Mino, “Small Windmill Handbook”, Second Edition, Second Printing, Power Co., Ltd., June 30, 1981, pp. 146-147

  As described above, the helical feathering method has a simple structure, but in order to rotate while smoothly sliding between the outer surface of the support shaft 9 and the inner surface of the spar 4 with the wind pressure applied to the blade 2. In addition, high accuracy and strength are required at the contact portion between the two, and the manufacture is not easy. Therefore, a helical feathering method having a sufficiently reliable and practical level has not been realized so far.

  In view of such circumstances, an object of the present invention is to provide a wind power generator that is provided with a variable pitch mechanism for blades and that is inexpensive and easy to manufacture.

  A first wind turbine generator according to the present invention is provided on each of a hub that is rotatable about a rotation center axis axis, a plurality of support arms provided radially on the hub, and the plurality of support arms. A plurality of blades, and a plurality of inclined hinge mechanisms respectively connecting the support arm and the blades.

  The support arm has an inclined surface inclined with respect to the rotation center axis axis. Each of the plurality of inclined hinge mechanisms includes a first hinge joint and a second hinge joint, one rotating member of the first hinge joint is connected to the inclined surface, and the other rotation of the first hinge joint is connected. The moving member is connected to one rotating member of the second hinge joint, and the other rotating member of the second hinge joint is connected to the blade.

  The first pivot shaft axis of the first hinge joint is inclined with respect to the longitudinal direction of the support arm, and the first pivot axis of the first hinge joint and the second hinge joint The second rotation shaft axis line is in a torsional positional relationship.

  The second wind power generator of the present invention is provided on each of the hub that is rotatable about the rotation center axis axis, the plurality of support arms provided radially on the hub, and the plurality of support arms. A plurality of blades, and a plurality of connection mechanisms for connecting the support arm and the blades, respectively.

  Each of the plurality of coupling mechanisms includes a first rotating member and a second rotating member. The first rotation member is connected to the support arm so as to be rotatable with respect to the support arm about a first rotation axis axis, and the second rotation member is a second rotation axis axis. Is connected to the blade so as to be rotatable with respect to the blade. The first rotating member and the second rotating member are connected.

  The first rotation axis axis and the rotation center axis are in a twisted positional relationship, and the first rotation axis and the second rotation axis are in a torsional relationship. It is characterized by being.

  In the present invention, an inclined hinge mechanism combining two hinge joints or a connecting mechanism combining two rotating members that connect the support arm and the blades supports the centrifugal force applied to the blades as a driving force. When moving in the longitudinal direction of the arm, the blade is rotated around the support arm. Thereby, the pitch of a blade | wing changes smoothly according to the magnitude | size (namely, rotational speed of an impeller) of centrifugal force. Therefore, according to the present invention, it is possible to realize a wind power generator that is provided with a variable pitch mechanism of blades and that is inexpensive and easy to manufacture.

  The wind turbine generator according to the present invention includes a propeller-type impeller (windmill) having a plurality of blades facing the windward side and converting wind energy into rotational energy. 2 and 3 are front views of the impeller of the wind turbine generator according to one embodiment of the present invention, FIG. 2 shows a case where the blade is in the initial pitch state, and FIG. 3 is a state where the blade is in the stop pitch state. Show the case. Here, the “initial pitch state” refers to a state in which the wind pressure received by the blades becomes maximum with respect to the wind in the direction of the rotation center axis axis 10A of the impeller, and the “stop pitch state” refers to the rotation of the impeller. A state in which the wind pressure received by the blade with respect to the wind in the direction of the central axis 10A is minimum.

  As shown in the drawing, a plurality of support arms 14 are provided radially at equiangular intervals on a hub 11 that can rotate in the direction of an arrow 8 about a rotation center axis 10A. The blades 13 are connected to each support arm 14 via two sets of inclined hinge mechanisms 50.

  4 is a cross-sectional view taken along line IV-IV perpendicular to the longitudinal direction of the support arm 14 in FIG. 2, and FIG. 5 is a line VV perpendicular to the longitudinal direction of the support arm 14 in FIG. FIG. 6 is an enlarged view of the portion VI of FIG. 2 viewed from a direction parallel to the rotation center axis 10A, and FIG. 7 is an enlarged view of the portion VII of FIG. 3 viewed from a direction parallel to the rotation center axis 10A. FIG. 4 and 6 are views showing an initial pitch state, and FIGS. 5 and 7 are views showing a stop pitch state. In each figure, in order to facilitate understanding of the direction, a Z-axis is also shown which is parallel to the rotation center axis axis 10A and has a positive side in the normal use state.

  The hub 11 is rotatably supported by the impeller shaft 10 along the rotation center axis 10A. When the hub 11 rotates in response to wind, the rotation is accelerated by a gearbox installed in a nacelle (not shown) via the impeller shaft 10, and transmitted to the generator to generate electrical energy. .

  The support arm 14 has a substantially strip shape, and has an inclined surface 14a that is substantially parallel to the longitudinal direction of the support arm 14 and inclined with respect to the rotation center axis axis 10A (that is, neither vertical nor parallel).

  The inclined hinge mechanism 50 includes first and second hinge joints. The first hinge joint is connected via a pair of first rotation shafts 52 provided on the first rotation shaft axis core 52A, and independently pivots around the first rotation shaft axis core 52A. Two freely U-shaped brackets (rotating members) 51 and 53 are provided. The second hinge joint is connected via a pair of second rotation shafts 56 provided on the second rotation shaft axis core 56A, and independently rotates around the second rotation shaft axis 56A. Two freely U-shaped brackets (rotating members) 55 and 57 are provided.

  One U-shaped bracket 51 of the first hinge joint is firmly attached to the inclined surface 14a facing the windward side of the support arm 14, and the other U-shaped bracket (first rotation member) 53 is One U-shaped bracket (second rotating member) 55 of the two hinge joint and the adjustment shaft 54 are connected to each other so as to be rotatable. The other U-shaped bracket 57 of the second hinge joint is firmly attached to the back surface 13b of the blade 13 (the surface opposite to the surface receiving the wind in the initial pitch state) 13b.

  Here, the first pivot shaft axis 52A of the first hinge joint is inclined with respect to the rotation center axis 10A when viewed from the longitudinal direction of the support arm 14 as shown in FIGS. (That is, neither vertical nor parallel), as shown in FIGS. 6 and 7, it is inclined with respect to the longitudinal direction of the support arm 14 when viewed from a direction parallel to the rotation center axis 10A. Further, the first rotation axis axis 52A is parallel to the inclined surface 14a of the support arm 14. In other words, the first rotation axis shaft core 52A and the rotation center shaft axis 10A are in a twisted positional relationship.

  Further, the first rotation axis axis 52A of the first hinge joint and the second rotation axis 56A of the second hinge joint are in a torsional positional relationship. However, since the first hinge joint and the second hinge joint are connected to each other via the adjustment shaft 54 so as to be rotatable with respect to each other, the direction of the first rotation shaft axis 52A and the second rotation shaft axis 56A. The relative relationship with the direction changes smoothly between the initial pitch state (see FIGS. 2, 4, and 6) and the stop pitch state (see FIGS. 3, 5, and 7).

  Since the support arm 14 and the blade 13 are connected via the two sets of inclined hinge mechanisms 50 as described above, the distance from the rotation center axis 10A to the blade 13 is from D0 shown in FIG. 3 (D1> D0), and in the course of this distance change, the inclination of the surface 13a of the blade 13 (the surface receiving the wind) 13a with respect to the Z axis (that is, the pitch of the blade 13) is shown in FIG. It changes to 5. That is, the blade 13 moves in a substantially spiral shape around the support arm 14.

  FIG. 8 is a front view showing the peripheral configuration of the hub 11. The plurality of blades 13 are connected to each other by a synchronization inter-blade link mechanism 29. The synchronizing blade-to-blade link mechanism 29 has a turning arm 29a that is rotatably held in the direction of arrow 28 around the rotation center axis 10A, and a connecting rod that connects the turning arm 29a and each blade 13 respectively. 29b. For this reason, the movements of the plurality of blades 13 are interlocked, and the pitches of all the blades 13 are always kept the same. In FIG. 8, a solid line indicates an initial pitch state, and a two-dot chain line 16 indicates a stop pitch state.

  The rotating arm 29a and one support arm 14 are connected by a centrifugal force resisting spring 6. The centrifugal force resisting spring 6 generates a biasing force in a direction that draws the blades 13 toward the rotation center axis 10A. The centrifugal force resisting spring 6 may be a single spring or a combination of a plurality of springs having different spring constants.

  The operation of the wind turbine generator of the present embodiment configured as described above will be described below.

  In a standby state in which the impeller is stopped and waiting for the wind to begin to blow, the blade 13 receives an urging force of the centrifugal force countering spring 6 and is in an initial pitch state (see FIGS. 2, 4, and 6). )It is in.

  The state of the wind is constantly measured by an anemometer (not shown) installed on the outer wall of the nacelle. When the anemometer senses that the wind has started blowing, the nacelle is rotated so that the impeller faces upwind.

  When the blade 13 and the support arm 14 receive wind, the impeller starts to rotate. When the impeller rotates, the centrifugal force in the direction indicated by the arrow 3 in FIG. 8 is generated in the blade 13 according to the rotation speed. When the wind speed increases and the rotational speed of the impeller increases, the centrifugal force 3 finally becomes greater than the urging force by the centrifugal force countering spring 6. As a result, the blades 13 gradually move away from the rotation center axis 10A, and smoothly move from the initial pitch state (see FIGS. 2, 4, and 6) to the stop pitch state (see FIGS. 3, 5, and 7). Move to. In the stop pitch state, the wind pressure received by the blades 13 is small and little rotational torque is generated in the impeller. Therefore, it is possible to prevent the impeller from being destroyed by applying an abnormal wind pressure to the blades 13 under a strong wind or by abnormally increasing the rotational speed.

  In the stop pitch state, when the wind speed decreases and the rotational speed of the impeller decreases, the centrifugal force 3 generated on the blade 13 becomes smaller than the urging force by the centrifugal force counterspring 6, so the blade 13 is contrary to the above. Move and return to the initial pitch when the wind stops.

  In this way, by providing the spring 6 for counteracting the centrifugal force that acts against the centrifugal force 3 to attract the blades 13 toward the rotation center axis 10A, the centrifugal force that changes according to the rotational speed of the impeller. Since the blade 13 moves in the longitudinal direction of the support arm 14 so that 3 and the urging force of the centrifugal force countering spring 6 are balanced, the pitch of the blade 13 changes accordingly.

  As described above, the wind turbine generator according to the present invention does not require an external hydraulic driving force or an electric driving force, and the pitch of the blades 13 is set using the centrifugal force generated in the blades 13 as a main driving force source. Can be changed.

  In the present invention, as shown in FIG. 8, a spring tension adjuster 30 may be connected in series to the centrifugal force resisting spring 6. As the spring tension adjuster 30, for example, a linear motion actuator having a variable length such as a hydraulic or electric telescopic cylinder can be used. The control device for controlling the length of the spring tension adjuster 30 may be installed in the hub 11 or the nacelle, or may be installed on the ground.

  Further, the turning arm 29 a and one support arm 14 may be connected by an emergency stop spring 31. The emergency stop spring 31 generates a biasing force in a direction to move the blade 13 away from the rotation center axis 10A, contrary to the centrifugal force countering spring 6 described above.

  In a state where the impeller is stationary, the behavior of the rotating arm 29a around the rotation center axis 10A is as follows: the urging force by the centrifugal force countering spring 6 and the urging force by the emergency stop spring 31 in the opposite direction. Determined by the balance point. At this time, if the length of the spring tension adjuster 30 is changed, the balance point can be arbitrarily changed.

  Since all the blades 13 are connected by the synchronization inter-blade link mechanism 29, it is not necessary to provide the centrifugal force countering spring 6, the spring tension adjuster 30, and the emergency stop spring 31 for each individual blade 13. Of course, these may be provided for each individual blade 13 without using the synchronization inter-blade link mechanism 29.

  As described above, when the emergency stop spring 31 and the spring tension adjuster 30 are further provided, the following operation can be performed.

  In the standby state where the impeller is stopped and waiting for the wind to start blowing, the pitch of the blades 13 is determined by the balance point between the urging force by the centrifugal force countering spring 6 and the urging force by the emergency stopping spring 31. It is determined. At this time, if the length of the spring tension adjuster 30 is changed, the balance point can be arbitrarily changed. For example, the length of the spring tension adjuster 30 may be adjusted, and the inclination of the blades 13 may be set to the starting pitch state. The start pitch state is a state between the initial pitch state (see FIGS. 2, 4, and 6) and the stop pitch state (see FIGS. 3, 5, and 7), and is the start torque ( (Torque required for the impeller to start rotating) is most easily obtained. Thereby, rotation of an impeller can be started easily.

  When the impeller shifts to the rotating state, the spring tension adjuster 30 may be reduced to set the inclination of the blade 13 to the initial pitch state.

  Further, when the blades 13 are in the stop pitch state, the spring tension adjuster 30 can be reduced so that the blades 13 are easily subjected to wind pressure.

  Thus, by adjusting the length of the spring tension adjuster 30, the resultant force of the centrifugal force generated in the blade 13 and the urging force of the emergency stop spring 31 and the centrifugal force in a state where the impeller rotates. Since the balance point with the urging force by the counterspring 6 can be adjusted, the pitch of the blades 13 can be arbitrarily adjusted. Therefore, the rotational speed of the impeller can be freely adjusted independently of the wind speed. Further, even when the impeller is stopped and the centrifugal force 3 is not generated, the pitch of the blades 13 can be arbitrarily adjusted.

  Applying this, for example, the wind speed, the rotational speed of the impeller, the wind pressure applied to the blade, the amount of power generated by the power generator, etc. are constantly detected, and the length of the spring tension adjuster 30 is determined based on these information. The rotational speed of the impeller may be increased or decreased by adjusting and adjusting the pitch of the blades 13. By performing such control, the wind turbine generator can be operated in an optimum state.

  When it is necessary to suddenly stop the rotation for some reason while the impeller is rotating, the spring tension adjuster 30 is extended manually or automatically, and the biasing force by the centrifugal force countering spring 6 is rapidly increased. It may be zero or substantially zero. Accordingly, the blade 13 receives the force of the emergency stop spring 31 and moves rapidly to the stop pitch state. The same effect can be obtained by releasing the tension state of the centrifugal force resisting spring 6 instead of extending the spring tension adjuster 30. This makes it possible to arbitrarily or automatically stop the rotation of the impeller of the wind power generator when a typhoon strikes, an earthquake occurs, or an abnormal vibration occurs due to imbalance of the impeller.

  In the above description, the adjustment shaft 54 allows a change in the relative relationship between the direction of the first pivot shaft axis 52A of the first hinge joint and the direction of the second pivot axis 56A of the second hinge joint. This realizes smooth movement of the blade 13 between the initial pitch state (see FIGS. 2, 4, and 6) and the stop pitch state (see FIGS. 3, 5, and 7). However, the position of the adjustment shaft 54 is not limited to the above in order to realize smooth movement of the blades 13.

  For example, as shown in FIG. 9, the U-shaped bracket 57 of the second hinge joint 57 and the blade 13 may be connected to each other via an adjustment shaft 54 so as to be rotatable. As a result, the relative angle between the U-shaped bracket 57 of the second hinge joint 57 and the second rotating shaft axis 56 </ b> A and the blade 13 changes smoothly around the adjustment shaft 54.

  Alternatively, as shown in FIG. 10, the U-shaped bracket 51 of the first hinge joint and the support arm 14 may be connected to each other via an adjustment shaft 54 so as to be rotatable. As a result, the relative angle between the U-shaped bracket 51 of the first hinge joint 51 and the first rotating shaft axis 52 </ b> A and the support arm 14 changes smoothly around the adjustment shaft 54.

  9 and 10, the U-shaped bracket 53 of the first hinge joint and the U-shaped bracket 55 of the second hinge joint include the first rotating shaft axis 52A and the second rotating shaft. The core wire 56A is firmly coupled and integrated while maintaining a constant twisted positional relationship.

  9 and 10 can provide the same effects of the present invention as described above.

  In the embodiment described above, the U-shaped bracket 51 of the first hinge joint is attached to the inclined surface 14a facing the leeward side of the support arm 14, and the surface (back surface) 13b facing the leeward side of the blade 13 in the initial pitch state. Although the U-shaped bracket 57 of the second hinge joint is attached, the present invention is not limited to this. For example, as shown in FIG. 11, a U-shaped bracket 51 of the first hinge joint is attached to an inclined surface 14b facing the leeward side of the support arm 14, and a surface (surface) facing the leeward side of the blade 13 in the initial pitch state. ) A U-shaped bracket 57 of the second hinge joint may be attached to 13a. The inclined surface 14b is inclined with respect to the rotation center axis 10A (that is, neither vertical nor parallel). In FIG. 11, the solid line indicates the initial pitch state, and the two-dot chain line 16 indicates the position of the blade 13 in the stop pitch state. Even in such a configuration, the blade 13 moves spirally in the direction of the arrow 32 around the support arm 14 between the initial pitch state and the stop pitch state, and the same effect of the present invention as described above is obtained. It is done.

  In FIG. 11, the adjustment shaft 54 is provided at the connection portion between the U-shaped bracket 53 of the first hinge joint and the U-shaped bracket 55 of the second hinge joint. As described above, it may be provided at the connecting portion between the U-shaped bracket 57 of the two hinge joint and the blade 13 or at the connecting portion between the U-shaped bracket 51 of the first hinge joint and the support arm 14. .

  The above configuration is an example, and the present invention is not limited to such a configuration.

  12 and 13 are cross-sectional views of an impeller of a wind turbine generator according to still another embodiment of the present invention, as viewed from a direction parallel to the longitudinal direction of the support arm 14. FIG. 12 shows the initial pitch state, and FIG. 13 shows the stop pitch state.

  In the embodiment shown in FIGS. 2 to 11, the pair of first rotation shafts 52 provided on the first rotation shaft axis 52 </ b> A is connected to the support arm 14 via the U-shaped bracket 51. It was. Further, the pair of second rotation shafts 56 provided on the second rotation shaft axis line 56 </ b> A was connected to the blades 13 via the U-shaped bracket 57. On the other hand, in the embodiment shown in FIGS. 12 and 13, the U-shaped bracket 51 is omitted, and the pair of first rotation shafts 52 provided on the first rotation shaft axis line 52 </ b> A is a support arm. 14 is fixed directly. Further, the U-shaped bracket 57 is omitted, and the pair of second rotation shafts 56 provided on the second rotation shaft axis 56 </ b> A are directly fixed to the blades 13.

  That is, in the embodiment shown in FIGS. 12 and 13, the support arm 14 and the blade 13 are connected by a connection mechanism 60 including U-shaped brackets 53 and 55. The U-shaped bracket (first rotation member) 53 is connected to the support arm 14 so as to be rotatable with respect to the support arm 14 about the first rotation axis axis 52A. The rotation member 55 is connected to the blade 13 so as to be rotatable with respect to the blade 13 about the second rotation axis 56A. The notch 58 provided in the support arm 14 enables rotation of the U-shaped bracket 53 around the first rotation axis 52A, and the notch 59 provided in the blade 13 is the second time of the U-shaped bracket 55. It is possible to turn around the moving shaft axis 56A.

  The first rotation axis shaft core wire 52A and the rotation center shaft shaft core wire 10A are in a twisted positional relationship. The first rotation axis axis 52A and the second rotation axis 56A are in a twisted positional relationship. However, since the U-shaped bracket 53 and the U-shaped bracket 55 are connected to each other via the adjustment shaft 54, the direction of the first rotation shaft axis line 52A and the second rotation shaft axis are connected. The relative relationship with the direction of the core wire 56A smoothly changes between the initial pitch state (see FIG. 12) and the stop pitch state (see FIG. 13). These are the same as the embodiment shown in FIGS.

  When the U-shaped bracket 51 is omitted and the pair of first rotation shafts 52 are directly fixed to the support arm 14, the support arm 14 has a substantially strip shape and the inclined surface 14a inclined with respect to the rotation center shaft axis 10A. , 14b. For example, as shown in FIG. 14, the cross-sectional shape perpendicular to the longitudinal direction of the support arm 14 may be circular. Of course, the cross-sectional shape of the support arm 14 is not limited to the circular shape shown in FIG. 14, and may be an arbitrary shape such as an elliptical shape or a rectangular shape. Further, the support arm 14 may have a tapered shape whose cross-sectional area decreases as the distance from the hub 11 increases. Depending on the shape of the support arm 14, as shown in FIG. 14, a pair of first rotating shafts 52 are provided so as to protrude from the support arm 14, so that a cut 58 as shown in FIGS. Even if it is not provided, the U-shaped bracket 53 can be turned around the first turning shaft axis 52A. Similarly, as shown in FIG. 14, by providing a pair of second rotating shafts 56 protruding from the blade 13, the U-shape can be obtained without providing the notch 59 as shown in FIGS. 12 and 13 on the blade 13. The bracket 55 can be turned about the second turning axis 56A.

  In the embodiment shown in FIGS. 12 to 14, the pair of second rotating shafts 56 may be connected to the blade 13 via the U-shaped bracket 57 as shown in FIGS. 2 to 11. In this case, the adjustment shaft 54 may be provided at the connection portion between the U-shaped bracket 53 and the U-shaped bracket 55 as shown in FIGS. 12 to 14, but the U-shaped as shown in FIG. You may provide in the connection part of the bracket 53 and the blade | wing 13. FIG. In the latter case, the second rotation axis 56A can be smoothly rotated with respect to the blade 13 around the adjustment shaft 54.

  Alternatively, in the embodiment shown in FIGS. 12 to 14, the pair of first rotating shafts 52 may be connected to the support arm 14 via the U-shaped bracket 51 as shown in FIGS. 2 to 11. good. In this case, the adjustment shaft 54 may be provided at the connection portion between the U-shaped bracket 53 and the U-shaped bracket 55 as shown in FIGS. 12 to 14, but the U-shaped as shown in FIG. You may provide in the connection part of the bracket 51 and the support arm 14. FIG. In the latter case, the adjustment shaft 54 is moved with respect to the support arm 14 in a plane in which the first rotation axis axis 52A is substantially parallel to the longitudinal direction of the support arm 14 and inclined with respect to the rotation center axis 10A. Smooth rotation is possible as the center.

  Also in the embodiment shown in FIGS. 12 to 14, the same effects of the present invention as described above can be obtained.

  In the above embodiment, the U-shaped brackets 51, 53, 55, and 57 are shown as the rotating members. However, the shape of the rotating members is not limited to this, and can be rotated around the rotation axis. If it is good. For example, a flat plate shape such as a hinge may be used.

  The pair of first rotation shafts 52 may be a single continuous rotation shaft. Similarly, the pair of second rotation shafts 56 may be a single continuous rotation shaft.

  In the above embodiment, one support arm 14 and one blade 13 are connected via two inclined hinge mechanisms 50 or two connecting mechanisms 60. However, the number of inclined hinge mechanisms 50 or connecting mechanisms 60 is as follows. The number is not limited to two, and may be three or more.

  Further, the number of support arms 14 and blades 13 provided on the hub 11 is not limited to two, and may be three or more.

  Further, the centrifugal force resisting spring 6 and the emergency stop spring 31 do not have to be tension coil springs as shown in the above embodiment. If the same urging force can be applied to the blades 13, a known elastic member such as a torsion coil spring or a leaf spring can be used.

  In the above embodiment, an example of an upwind type in which the impeller is on the windward side with respect to the nacelle has been shown, but the wind power generator of the present invention is not limited thereto, and the impeller is on the leeward side with respect to the nacelle. It may be down window type. The rotation direction of the impeller may be a right rotation (clockwise rotation) or a left rotation (counterclockwise rotation) when the impeller is viewed from the windward side.

  Also, as a driving force source that rotates the nacelle so that the rotation center axis of the impeller is always substantially parallel to the wind direction, in the case of the upwind type, a vertical tail type tail of an airplane is provided on the nacelle and the tail The wind pressure applied may be used, or in the case of the downwind type, the wind pressure applied to the impeller may be used.

  The field of application of the present invention is not particularly limited, and can be widely used as a wind power generator that can be constructed not only in regions with high annual wind energy density but also in regions with low wind energy density.

Explanatory drawing showing the schematic configuration of the helical feathering system In the wind power generator concerning one embodiment of the present invention, it is a front view of an impeller in an initial pitch state. In the wind power generator concerning one embodiment of the present invention, it is a front view of an impeller in a stop pitch state. It is arrow sectional drawing in the IV-IV line of FIG. It is arrow sectional drawing in the VV line | wire of FIG. FIG. 3 is an enlarged view of a part VI in FIG. 2. It is an enlarged view of the part VII of FIG. In the wind power generator concerning one embodiment of the present invention, it is the front view of the impeller which showed the schematic structure of the spring for counteracting centrifugal force, the link mechanism for synchronization blades, the spring for emergency stop, and the spring tension adjuster. In the wind power generator concerning another embodiment of the present invention, it is an arrow sectional view in the position equivalent to the IV-IV line of Drawing 2. In the wind power generator concerning another embodiment of the present invention, it is an arrow sectional view in the position corresponding to the IV-IV line of Drawing 2. In the wind power generator concerning another embodiment of the present invention, it is an arrow sectional view in the position corresponding to the IV-IV line of Drawing 2. In the wind power generator concerning another embodiment of the present invention, it is a sectional view seen from the direction parallel to the longitudinal direction of a support arm of an impeller in an initial pitch state. In the wind power generator concerning another embodiment of the present invention, it is a sectional view seen from the direction parallel to the longitudinal direction of the support arm of the impeller in a stop pitch state. In the wind power generator concerning another embodiment of the present invention, it is a sectional view seen from the direction parallel to the longitudinal direction of a support arm of an impeller in an initial pitch state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Direction in which the pitch angle changes 2 Blade 3 Centrifugal force 4 Spur 4a Pin 5 Wind 6 Centrifugal force spring 7 Spiral groove 8 Rotating direction of impeller 9 Support shaft 10 Impeller shaft 10A Rotation center shaft axis core 11 Hub 13 Blade 13a Blade surface 13b Blade back surface 14 Support arms 14a, 14b Inclined surface 16 Stop pitch state 28 Link mechanism movement 29 Synchronization inter-blade link mechanism 29a Rotating arm 29b Connecting rod 30 Spring tension adjuster 31 Emergency stop spring 32 Direction in which blades move due to change in centrifugal force 50 Inclined hinge mechanism 51 U-shaped bracket (rotating member)
52 First Rotating Shaft 52A First Rotating Shaft Axis Core 53 U-Shaped Bracket (First Rotating Member)
54 Adjustment shaft 55 U-shaped bracket (second rotating member)
56 Second rotating shaft 56A Second rotating shaft axis 57 57 U-shaped bracket (rotating member)
58, 59 Notch 60 Connection mechanism

Claims (8)

A hub that is rotatable about a rotation center shaft axis, a plurality of support arms radially provided on the hub, a plurality of blades provided on each of the plurality of support arms, the support arm and the blades And a plurality of inclined hinge mechanisms that connect the two, respectively,
The support arm has an inclined surface inclined with respect to the rotation center axis axis.
Each of the plurality of inclined hinge mechanisms includes a first hinge joint and a second hinge joint, one rotating member of the first hinge joint is connected to the inclined surface, and the other rotation of the first hinge joint is connected. The moving member is connected to one rotating member of the second hinge joint, the other rotating member of the second hinge joint is connected to the blade,
The first pivot axis of the first hinge joint is inclined with respect to the longitudinal direction of the support arm;
The wind turbine generator according to claim 1, wherein the first pivot shaft axis of the first hinge joint and the second pivot axis of the second hinge joint are in a twisted positional relationship.   The wind turbine generator according to claim 1, wherein the other rotating member of the first hinge joint and the one rotating member of the second hinge joint are connected to each other so as to be rotatable.   The wind turbine generator according to claim 1, wherein the other rotating member of the second hinge joint and the blade are connected to each other so as to be rotatable.   The wind turbine generator according to claim 1, wherein the one rotation member of the first hinge joint and the inclined surface are connected to each other so as to be rotatable. A hub that is rotatable about a rotation center shaft axis, a plurality of support arms radially provided on the hub, a plurality of blades provided on each of the plurality of support arms, the support arm and the blades And a plurality of coupling mechanisms for coupling the two, respectively,
Each of the plurality of coupling mechanisms includes a first rotating member and a second rotating member,
The first rotation member is connected to the support arm so as to be rotatable with respect to the support arm about a first rotation axis.
The second rotating member is connected to the blade so as to be rotatable with respect to the blade about a second rotating shaft axis.
The first rotating member and the second rotating member are connected;
The first rotation axis axis and the rotation center axis are in a twisted positional relationship,
The wind turbine generator according to claim 1, wherein the first rotating shaft axis and the second rotating shaft axis are in a twisted positional relationship.   The wind power generator according to claim 5, wherein the first rotating member and the second rotating member are connected so as to be rotatable relative to each other.   The wind turbine generator according to claim 5, wherein the second rotation shaft axis is rotatable with respect to the blade. 6. The first pivot shaft axis is rotatable with respect to the support arm in a plane substantially parallel to the longitudinal direction of the support arm and inclined with respect to the rotation center axis axis. The wind power generator described in 1.

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