JP2015151961A - Rotary wing blade, rotary wing, and rotary wing blade manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a rotary wing having high performance while suppressing degradations in workability and strength.SOLUTION: A rotary wing blade 20 coupled to an outer circumferential portion of a rotor of a rotary wing, comprises: an FRP blade body 21 that includes a large diameter part 21L with the cross-sectional shape orthogonal to a wing length direction of which is long in one direction and a small diameter part 21S with the cross-sectional shape of which is shorter than the large diameter part 21L in the other direction crossing one direction in a proximal end portion 21b fixed to the outer circumferential portion of the rotor; an FRP outer circumferential adapter 22 provided on an outer circumference of the small diameter part 21S in the proximal end portion 21b of the blade body 21; and an FRP inner circumferential adapter 23 provided on an inner circumference of the large diameter part 21L.

Description

  The present invention relates to a rotor blade of a rotor blade such as a windmill or an underwater rotor blade, a rotor blade, and a method of manufacturing the rotor blade.

Wind turbines of wind power generators and rotary blades such as underwater rotor blades of ocean current generators are provided with a plurality of blade blades on the outer peripheral side of a rotatable rotor. The blade blade has a blade cross-sectional shape in which one direction connecting the leading edge side and the trailing edge side has a major axis and the other direction orthogonal to the one direction has a minor axis.
The base end portion of the blade blade is coupled to a hub provided on the outer peripheral portion of the rotor by a bolt or the like. The tip end side of the blade blade has a blade cross-sectional shape optimized for increasing efficiency, whereas the base end portion side of the blade blade is often elliptical.

Here, as shown in FIG. 7, if the cross-sectional shape of the base end portion 1 a of the blade blade 1 is an elliptical shape, the blade blade 1 has a cross section of the blade blade 1 in the short diameter direction Dy with respect to the long diameter direction Dx. The distance from the center C of the cross section to the bolt 2 which is the connecting position of the blade blade 1 to the hub is small.
For this reason, at the base end portions of the blade surfaces 1f and 1g on both sides in the short diameter direction Dy of the blade blade 1, the force when a moment due to wind or ocean current acts on the blade blade 1 with respect to the long diameter direction Dx is further increased. Acts greatly. In particular, in the blade blade 1, this tendency becomes more prominent because a large moment due to wind or ocean current acts on the blade surfaces 1f and 1g on both sides in the minor axis direction Dy.

  Therefore, Patent Document 1 discloses a configuration using a metal socket that is formed in a cylindrical shape and covers the base end portion of the blade blade in order to increase the coupling strength of the base end portion of the blade blade to the hub. .

  Patent Documents 2 and 3 disclose configurations in which the cross-sectional shape of the base end portion of the blade blade is circular, and the strength of attaching the base end portion of the blade blade to the hub is ensured.

US Patent Application Publication No. 2013/0106105 (FIG. 14) JP-A-11-182408 JP 2012-172560 A

  However, the configuration disclosed in Patent Document 1 is heavy because the socket is made of metal. Since the weight of the socket acts on the rotor of the rotor blade in addition to the blade blade, the weight of the socket directly affects the performance of the rotor blade.

  In addition, when the cross-sectional shape of the base end portion of the blade blade is circular as in the configurations disclosed in Patent Documents 2 and 3, from the portion having the blade cross-sectional shape to the portion having a circular cross section in the blade blade. The change in the cross-sectional shape is large. When the blade blade is formed of FRP (Fiber Reinforced Plastics), the shape of the blade blade is complicated at a portion where the sectional shape of the blade blade changes greatly. Then, it is difficult to paste a sheet-like FRP material, and workability is lowered. Moreover, bending and wrinkles enter the FRP material (reinforcing fiber) that is pasted, and the strength of the wing blade is reduced.

  Accordingly, an object of the present invention is to provide a rotor blade, a rotor blade, and a method of manufacturing the rotor blade capable of suppressing a decrease in workability and strength and obtaining a rotor blade having high performance.

  In order to solve this problem, a rotor blade as one aspect according to the present invention is a rotor blade coupled to an outer peripheral portion of a rotor of the rotor blade, and a proximal end coupled to the outer peripheral portion of the rotor The blade main body made of fiber reinforced plastic has a long diameter portion that is long in one direction and a short diameter portion that is shorter than the long diameter portion in the other direction intersecting the one direction. And an outer peripheral adapter made of fiber reinforced plastic provided on the outer peripheral side of the short diameter portion at the base end portion of the blade main body, and an inner peripheral side of the long diameter portion at the base end portion of the blade main body. And an inner peripheral adapter made of fiber reinforced plastic.

  In this way, at the base end of the rotor blade, by providing the outer peripheral adapter on the outer peripheral side of the short diameter portion of the blade body and the inner peripheral adapter on the inner peripheral side of the long diameter portion, the base end portion of the rotor blade The wall thickness increases. Thereby, especially the strength against the bending moment when the base end portion of the rotor blade is coupled to the rotor can be increased. Further, since the cross-sectional shape of the base end portion of the blade body itself remains an irregular shape having a long diameter portion and a short diameter portion, it is possible to suppress a sudden change in the cross-sectional shape. Therefore, it is easy to stick the reinforcing fiber, and it is possible to prevent the reinforcing fiber from wrinkling. Moreover, since the inner peripheral adapter and the outer peripheral adapter are made of fiber reinforced plastic, they are lightweight.

In the rotary blade, the blade body, the inner peripheral adapter, and the outer peripheral adapter may form a cylindrical tubular portion.
Furthermore, in the rotor blade, a plurality of bolt insertion holes through which bolts for coupling the cylindrical portion to the outer peripheral portion of the rotor are inserted in a circle along the circumferential direction of the cylindrical portion. Good.
By comprising in this way, the intensity | strength with respect to the bending moment from all directions can be raised in the base end part of the rotary blade which consists of a cylindrical part.

In the rotary blade, the outer peripheral adapter may be provided so as to cover a portion having a maximum radius of curvature in the circumferential direction on the outer peripheral surface of the base end portion of the blade body.
Furthermore, in the rotary blade, the inner peripheral adapter may be provided so as to cover a portion having a minimum radius of curvature in the circumferential direction on the inner peripheral surface of the base end portion of the blade body.

Further, in the rotor blade, the blade body is composed of a blade divided body divided into a plurality in the circumferential direction, and the inner peripheral adapter is provided so as to straddle the joining position of the blade divided bodies adjacent to each other. You may be allowed to.
By comprising in this way, the joint strength of blade division bodies can also be raised with an inner periphery adapter.

Further, in the rotor blade, a reinforcing body may be provided on the outer peripheral portion of the blade body, the inner peripheral adapter, and the outer peripheral adapter.
By comprising in this way, the intensity | strength in the base end part of a rotary blade can be raised further.

According to another aspect of the present invention, there is provided a rotor blade including a rotor provided rotatably and the rotor blade blade connected to an outer peripheral portion of the rotor.
According to such a configuration, it is possible to increase the strength against the bending moment when the base end portion of the rotor blade is coupled to the rotor. In addition, it is possible to suppress a sudden change in the cross-sectional shape of the blade body. Therefore, it is easy to stick the reinforcing fiber, and it is possible to prevent the reinforcing fiber from wrinkling. Moreover, since the inner peripheral adapter and the outer peripheral adapter are made of fiber reinforced plastic, they are lightweight.

Further, the manufacturing method of the rotary blade as one aspect according to the present invention is a method of manufacturing the rotary blade, wherein the inner peripheral adapter is provided on an inner peripheral surface of the long diameter portion of the base end portion of the blade body. And the outer peripheral adapter is bonded to the outer peripheral surface of the short diameter portion of the base end portion of the blade body.
In this way, the rotor blade as described above can be easily manufactured.

  According to the rotor blade, the rotor blade, and the method for manufacturing the rotor blade according to the present invention, it is possible to obtain a rotor blade having high performance while suppressing deterioration in workability and strength.

It is a side view which shows schematic structure of the rotary blade which concerns on one Embodiment of this invention. It is a figure which shows the structure of a rotary blade, (a) is sectional drawing which follows the direction which ties the front edge part of a rotary blade blade, and a rear edge part, (b) is the front edge part and rear edge part of a rotary blade blade It is sectional drawing in alignment with the direction orthogonal to the direction which ties. It is a figure which shows the cross-sectional structure of a rotary blade, (a) is a figure which shows the cross-sectional structure in the base end part of a rotary blade, (b) is a figure which shows the cross-sectional structure in the intermediate part of a rotary blade, (c) These are figures which show the cross-section in the front-end | tip part side of a rotary blade. It is a disassembled perspective view which shows the components structure of a rotary blade. As a modification of the rotary blade, it is a diagram showing a plurality of examples in which a reinforcing body is provided on the outer peripheral surface of the base end portion of the rotary blade. It is a figure which shows the modification of the said rotary blade, and is a figure which shows the example at the time of making the base end part of a rotary blade blade into an elliptical cross section. It is a schematic diagram which shows the base end part of the conventional blade | wing blade.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of a rotor blade, a rotor blade, and a rotor blade manufacturing method according to the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited only to this embodiment.
FIG. 1 is a side view showing a schematic configuration of a rotary blade.
As shown in FIG. 1, the rotary blade 10 includes a rotor 11 that is rotatably provided, and a plurality of rotary blade blades 20 that are connected to the outer periphery of the rotor 11.

  A connection hub 12 for connecting the rotary blades 20 is formed on the outer peripheral surface of the rotor 11. The rotor blade 20 is coupled to the connection hub 12 by a bolt 50.

2A and 2B are diagrams showing a configuration of a rotor blade, where FIG. 2A is a cross-sectional view taken along a direction connecting the front edge and the rear edge of the rotor blade, and FIG. 2B is a front edge of the rotor blade. It is sectional drawing in alignment with the direction orthogonal to the direction which ties and a rear edge part. 3A and 3B are diagrams showing a cross-sectional structure of the rotor blade, wherein FIG. 3A is a diagram showing a cross-sectional structure at the proximal end of the rotor blade, and FIG. 3B is a diagram showing a cross-sectional structure at the intermediate portion of the rotor blade. (C) is a figure which shows the cross-sectional structure in a rotor blade front-end | tip part side. FIG. 4 is an exploded perspective view showing a component configuration of the rotor blade.
As shown in FIGS. 2 to 4, the rotary blade 20 includes a blade body 21, an outer peripheral adapter 22, and an inner peripheral adapter 23.

  The blade body 21 is made of FRP, and is formed so as to extend from the base end portion 21 b fixed to the connection hub 12 at the outer peripheral portion of the rotor 11 toward the outer peripheral side of the rotor blade 10 (outside in the radial direction of the rotor 11). ing.

As shown in FIGS. 3 (a) and 3 (b), the base end portion 21b and the intermediate portion 21c of the blade body 21 have a cross-sectional shape perpendicular to the blade length direction connecting the leading edge portion 21f and the trailing edge portion 21g. It has an elliptical shape having a long diameter portion 21L that is long in one direction and a short diameter portion 21S that is shorter than the long diameter portion 21L in the other direction that intersects in one direction.
Further, as shown in FIG. 3C, the leading end 21d side of the blade body 21 has a so-called blade cross-sectional shape in which the curvature radius of the trailing edge 21g is smaller than the curvature radius of the leading edge 21f. Yes.

  As shown in FIG. 4, such a blade body 21 is formed of two blade divided bodies 21A and 21B along a dividing line connecting the front edge portion 21f and the rear edge portion 21g. These blade division bodies 21A and 21B are integrated by abutting each other to form a blade body 21.

As shown in FIGS. 2B, 3 </ b> A, and 4, the outer peripheral adapter 22 is made of FRP, and is provided on the outer peripheral side of the short diameter portion 21 </ b> S at the proximal end portion 21 b of the blade body 21. . The outer peripheral adapter 22 has a shape along the outer peripheral surface of the short diameter portion 21 </ b> S so that one surface 22 a thereof is in close contact with the outer peripheral surface of the short diameter portion 21 </ b> S of the blade body 21. The outer peripheral adapter 22 has the other surface 22b formed with a constant radius of curvature. The other surface 22b of the outer peripheral adapter 22 is formed with a radius of curvature substantially the same as the radius of curvature of the long diameter portion 21L of the blade body 21.
The outer peripheral adapter 22 is formed so that its thickness and circumferential length gradually decrease from the base end portion 22c toward the distal end portion 22d.

The outer peripheral adapter 22 is disposed along the short diameter portion 21S on both sides in the short diameter direction of the blade body 21, and is bonded and fixed to the short diameter portion 21S with an adhesive or the like.
Here, the short diameter portion 21S refers to a portion of the base end portion 21b of the blade body 21 that has the smallest diameter dimension from the blade center in a cross section orthogonal to the blade length direction. That is, the short diameter portion 21 </ b> S is a portion of the blade body 21 that has the largest curvature radius on the outer peripheral surface thereof. Accordingly, the outer peripheral adapter 22 is provided on the outer peripheral surface of the base end portion 21b of the blade body 21 so as to cover a portion having a maximum radius of curvature in the circumferential direction.

As shown in FIG. 2A, FIG. 3A, and FIG. 4, the inner peripheral adapter 23 is made of FRP, and is provided on the inner peripheral side of the long diameter portion 21L at the proximal end portion 21b of the blade body 21. Yes. The inner peripheral adapter 23 has a shape along the inner peripheral surface of the long diameter portion 21L so that one surface 23a thereof is in close contact with the inner peripheral surface of the long diameter portion 21L of the blade body 21. The other surface 23b of the inner peripheral adapter 23 is formed with a constant radius of curvature. The other surface 23b of the inner peripheral adapter 23 is formed with a radius of curvature substantially the same as the radius of the short diameter portion 21S of the blade body 21.
The inner peripheral adapter 23 is formed such that its thickness and circumferential length gradually decrease from the base end portion 23c toward the distal end portion 23d.

The inner peripheral adapter 23 is disposed along the long diameter portions 21L on both sides in the long diameter direction of the blade body 21, and is bonded and fixed to the long diameter portion 21L with an adhesive or the like.
Here, the long diameter portion 21L refers to a portion of the base end portion 21b of the blade body 21 that has the largest diameter dimension from the blade center in a cross section orthogonal to the blade length direction. That is, the long diameter portion 21L is a portion of the blade body 21 where the radius of curvature of the inner peripheral surface is the smallest. Thereby, the inner peripheral adapter 23 is provided on the inner peripheral surface of the base end portion 21b of the blade body 21 so as to cover a portion having the smallest radius of curvature in the circumferential direction.

As shown in FIG. 2 and FIG. 3A, in the rotor blade 20, the blade main body 21, the inner peripheral adapter 23, and the outer peripheral adapter 22 are formed in a cylindrical shape at the base end portion 21 b of the blade main body 21. A portion 24 is formed.
The rotor blade 20 has a plurality of bolt insertion holes 26 arranged in a circle along the circumferential direction of the tubular portion 24. For this reason, the plurality of bolt insertion holes 26 are appropriately formed in the blade body 21, the inner peripheral adapter 23, and the outer peripheral adapter 22. In each bolt insertion hole 26, a female screw hole is formed in the inner peripheral surface in a cylindrical shape, and a T-nut 52 having a nut portion 52a whose diameter is increased on the outer peripheral side is embedded in the rear end portion.
Then, the plurality of bolts 50 are respectively inserted through the through holes formed in the connection hub 12 of the rotor 11 and fastened to the T nuts 52 in the bolt insertion holes 26.
With this configuration, the base end portion of the rotary blade 20 formed of the cylindrical portion 24 is coupled to each connection hub 12 of the rotor 11.

Next, a method for manufacturing the above-described rotor blade 20 will be described.
When manufacturing the rotor blade 20, first, blade divided bodies 21 </ b> A and 21 </ b> B, an outer peripheral adapter 22, and an inner peripheral adapter 23 that form the blade body 21 are formed.
Next, the blade divided bodies 21 </ b> A and 21 </ b> B are brought into contact with each other and bonded to assemble the blade body 21.
Then, the inner peripheral adapter 23 is joined to the inner peripheral surface of the long diameter portion 21L of the base end portion 21b of the blade body 21. Further, the outer peripheral adapter 22 is joined to the outer peripheral surface of the short diameter portion 21S of the base end portion 21b of the blade body 21.
In this way, the above-described rotor blade 20 can be easily manufactured.

  Note that the inner peripheral adapter 23 and the outer peripheral adapter 22 may be formed by sequentially laminating the FRP material on-site by the hand lay-up method, the vacuum impregnation method, or the like after the blade body 21 is assembled.

As described above, according to the rotating blade blade 20 and the rotating blade 10 of the present embodiment, the outer peripheral adapter 22 is provided on the outer peripheral side of the short diameter portion 21S of the blade body 21 at the base end portion of the rotating blade blade 20. An inner peripheral adapter 23 is provided on the inner peripheral side of the long diameter portion 21L. Thereby, the base end part of the rotor blade 20 becomes thick, and the outer shape approximates to a circle. Thereby, in particular, when the base end portion 21b of the rotor blade 20 is coupled to the rotor 11, the strength of the rotor blade 20 with respect to the bending moment, particularly in the minor axis direction, can be increased. Further, since the cross-sectional shape of the base end portion 21b remains the deformed shape having the long diameter portion 21L and the short diameter portion 21S, the blade main body 21 itself can suppress a sudden change in the cross-sectional shape. Accordingly, it is possible to prevent wrinkles on the reinforcing fibers when the blade body 21 is manufactured. As a result, it is possible to suppress a decrease in workability and strength when the rotor blade 20 is manufactured.
Moreover, since the inner peripheral adapter 23 and the outer peripheral adapter 22 are made of FRP, they are lightweight. Thereby, it becomes possible to obtain the rotary blade 10 having high performance.

  Further, the rotor blade 20 is configured such that the blade body 21, the inner peripheral adapter 23, and the outer peripheral adapter 22 form a cylindrical tubular portion 24. Further, the rotor blade 20 is configured such that a plurality of bolt insertion holes 26 through which the bolts 50 are inserted are arranged in a circle along the circumferential direction of the cylindrical portion 24. By comprising in this way, the intensity | strength with respect to the moment force from any direction which acts on the base end part of the rotary blade 20 can be raised with sufficient balance.

  In addition, the blade body 21 includes blade divided bodies 21A and 21B divided into a plurality of parts in the circumferential direction, and the inner peripheral adapter 23 is provided so as to straddle the joint position between the blade divided bodies 21A and 21B adjacent to each other. ing. With this configuration, the inner peripheral adapter 23 can increase the bonding strength of the blade divided bodies 21A and 21B.

(Other embodiments)
The rotor blade, rotor blade, and rotor blade manufacturing method of the present invention are not limited to the above-described embodiments described with reference to the drawings, and various modifications are possible within the technical scope thereof. Conceivable.
FIG. 5 is a diagram showing a plurality of examples in which reinforcing bodies are provided on the outer peripheral surface of the base end portion of the rotor blade as a modification of the rotor blade.
For example, as illustrated in FIG. 5A, the rotor blade 20 may be configured such that a reinforcing body 70 is provided on the outer peripheral portion of the blade body 21, the inner peripheral adapter 23, and the outer peripheral adapter 22. The reinforcing body 70 is provided so that the FRP material is wound around the entire outer peripheral surface of the base end portion of the rotor blade 20.
By comprising in this way, the intensity | strength in the base end part of the rotary blade blade 20 can further be raised. Further, the entire proximal end portion of the rotary blade 20 can be protected. Furthermore, the adhesion part of the blade main body 21 and the outer periphery adapters 22 and 22 can be covered, and it can also suppress that the outer periphery adapters 22 and 22 peel from the blade main body 21. FIG.

Further, as shown in FIG. 5B, a reinforcing body 71 made of an FRP material is provided so as to cover the front edge portion 21f and the rear edge portion 21g of the blade body 21 and the outer peripheral adapters 22 and 22 on both sides thereof. Also good.
By comprising in this way, the intensity | strength in the base end part of the rotary blade blade 20 can further be raised. Further, the front edge and the rear edge of the rotor blade 20 can be protected. Furthermore, the adhesion part of the blade main body 21 and the outer periphery adapters 22 and 22 can be covered, and it can also suppress that the outer periphery adapters 22 and 22 peel from the blade main body 21. FIG.

Moreover, as shown in FIG.5 (c), you may provide the reinforcement body 72 by providing FRP material so that the circumferential direction both sides of the outer periphery adapter 22 may be covered.
By comprising in this way, the intensity | strength in the base end part of the rotary blade blade 20 can further be raised. Moreover, the circumferential direction both sides of the outer periphery adapter 22 can be protected.

  In the above-described embodiment, the inner peripheral adapter 23 and the outer peripheral adapter 22 are provided at the base end portion of the rotor blade 20 so that the cross-sectional shape is substantially circular. However, the present invention is not limited thereto. If the strength of the base end portion of the rotor blade 20 with respect to the bending moment can be sufficiently ensured, for example, as shown in FIG. You may make it the cross-sectional shape of a base end part become an ellipse.

Moreover, about the rotary blade 10 shown by the said embodiment, the use is not limited at all.
Furthermore, the coupling structure between the rotor blade 20 and the connection hub 12 may be any configuration.
In addition to this, the configuration described in the above embodiment can be selected or changed to another configuration as appropriate without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 Rotating blade 11 Rotor 20 Rotating blade blade 21 Blade main body 21A, 21B Blade division body 21L Long diameter part 21S Short diameter part 21b Base end part 21c Intermediate part 21d Front end part 21f Front edge part 21g Rear edge part 22 Outer peripheral adapter 23 Inner peripheral adapter 24 cylindrical portion 26 bolt insertion hole 50 bolt 70 reinforcing body 71 reinforcing body 72 reinforcing body

Claims (9)

A rotor blade coupled to the outer periphery of the rotor of the rotor,
At the base end portion coupled to the outer peripheral portion of the rotor, the cross-sectional shape orthogonal to the blade length direction is a long diameter portion that is long in one direction, and a short diameter portion that is shorter than the long diameter portion in the other direction intersecting the one direction. A blade body made of fiber reinforced plastic, and
In the base end portion of the blade body, an outer peripheral adapter made of fiber reinforced plastic provided on the outer peripheral side of the short diameter portion,
In the base end portion of the blade body, an inner peripheral adapter made of fiber reinforced plastic provided on the inner peripheral side of the long diameter portion,
Rotor blade equipped with.   The rotor blade according to claim 1, wherein the blade body, the inner peripheral adapter, and the outer peripheral adapter form a cylindrical tubular portion.   The rotor blade according to claim 2, wherein a plurality of bolt insertion holes through which bolts for fixing the cylindrical portion to the outer peripheral portion of the rotor are inserted are arranged in a circle along the circumferential direction of the cylindrical portion.   The rotation according to any one of claims 1 to 3, wherein the outer peripheral adapter is provided so as to cover a portion having a maximum radius of curvature in a circumferential direction on the outer peripheral surface of the base end portion of the blade body. Wing blade.   The said inner peripheral adapter is provided so that the part where the curvature radius of the circumferential direction is the minimum may be provided in the inner peripheral surface of the said base end part of the said blade main body. Rotor blades. The blade body is composed of a blade divided body divided into a plurality in the circumferential direction,
The rotor blade according to any one of claims 1 to 5, wherein the inner peripheral adapter is provided so as to straddle a joining position between the blade divided bodies adjacent to each other.   The rotor blade according to any one of claims 1 to 6, wherein a reinforcing body is provided on outer peripheral portions of the blade body, the inner peripheral adapter, and the outer peripheral adapter. A rotor provided rotatably,
The rotor blades according to any one of claims 1 to 7, coupled to the outer periphery of the rotor;
Rotor wing equipped with. A method for producing a rotor blade according to any one of claims 1 to 7,
While joining the inner peripheral adapter to the inner peripheral surface of the major diameter portion of the base end portion of the blade body,
A method for manufacturing a rotor blade, wherein the outer peripheral adapter is joined to an outer peripheral surface of the short diameter portion of the base end portion of the blade body.

Images