JP6806503B2 - Horizontal axis rotor - Google Patents

Description

The present invention relates to a horizontal shaft rotor, and particularly relates to a horizontal shaft rotor having high rotational efficiency for a hydroelectric generator.

As a lift type blade in a rotor for a hydroelectric generator, for example, a blade having a large width at the tip of the blade is disclosed in Patent Document 1.

Japanese Unexamined Patent Publication No. 2000-9012

The blade described in Patent Document 1 has a large receiving area, but on the other hand, it has a large resistance, so that the rotation efficiency is poor.
In the present invention, the width of the blade tip portion is made small, and the blade is inclined toward the trailing edge to form a laterally inclined portion, so that the fluid hitting the laterally inclined portion passes through the radius of gyration instead of the outside radiation direction. It is an object of the present invention to provide a horizontal axis rotor having a blade which is fused with a fluid along a base to improve rotational efficiency.

The specific contents of the present invention are as follows.

(1) in front view at the hub in a fixed lift type blade rotor, the central portions middle nearly spanwise the maximum chord length portion, towards the blade root from the maximum chord length portion as a base portion, the hub with a progressively chord length over the boundary small, to form a sideways inclined portion greatly bent to the trailing edge direction as a base point of said maximum chord length portion as tapered over the blade tip from the maximum chord length portion, said The laterally inclined portion is a horizontal axis rotor in which the front surface from the boundary with the base portion to the wing tip is inclined forward with respect to the front surface of the base portion with the maximum chord length portion as a base point in a side view.

(2) previously in KiAge force type blade front view of a center line S of the width of the base passing through the central portion O of the chord length at substantially the center portion of the length of該揚force type blade, the width of the lateral direction inclined portion of the center line T, intersect at a range of 120 degrees to 14 0 °, in plan view in a state of upright the base, the lateral direction inclined portion and a tapering tip, the maximum chord length portion The horizontal axis rotor according to ( 1 ) above, which projects diagonally forward from the trailing edge of the base as a base point .

(3) in a front view of the front KiAge force type blade, with respect to the center line T of the width of the lateral direction inclined section intersecting the center line S of the width of the base portion, the leading edge of the horizontal direction inclined portion, a length The horizontal axis rotor according to (1) or ( 2 ) above, wherein the middle portion of the dimension is an arc curved surface protruding outward .

(4) Before KiAge force type Oite when the number of blades is even more than three, the lift type blade is largely swell convex on one side, in the front and back in the direction of rotation, the front free face and a said convex surface The horizontal axis rotor according to any one of (1) to ( 3 ) above, which is formed and arranged alternately visually .

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

In the horizontal axis rotor described in (1) above, the lift type blade is bent laterally in the trailing edge direction from approximately the midpoint of the blade length to the blade tip in front view, so that the fluid received in the front is received. When rotated by, the fluid that hits the front of the base moves in the direction of the laterally inclined portion, the movement is restrained by the laterally inclined portion, and the rotation radius is along the front of the laterally inclined portion that is inclined from the front edge portion to the trailing edge portion. It goes in and joins the fluid passing along the inclined surface from the front edge to the trailing edge of the front of the base and passes at high speed to improve the rotation efficiency. Further, in the laterally inclined portion of the lift type blade, the blade tip is tilted forward from the boundary portion with the base portion in the frontward direction, so that the fluid moving from the blade root direction to the blade tip direction during rotation is laterally inclined. Since it hits the inclined portion and moves in the front direction, the fluid pressure on the blade increases, and the rotation efficiency is improved .

On the horizontal axis rotor according to (2), and center line S of the base of the lift type blade, a center line T of the width of the lateral direction inclined portion, intersect in the range of 1 20 degrees to 1 40 degrees, the wing Since the end is tapered in front view, it has the effect of reducing resistance during rotation and increasing rotation efficiency.

Wherein the lift-type blade according to (3), the front in a front view of KiAge force type blade, with respect to the center line T of the width of the lateral direction inclined section intersecting the center line S of the width of said base portion, said Since the front edge of the laterally inclined portion has an arc curved surface in which the middle portion of the length protrudes outward, the airflow corresponding to the front edge of the laterally inclined portion smoothly passes in the direction of the trailing edge of the blade during rotation. Increase rotation efficiency .

In the invention described in ( 4 ) above, when the number of lift type blades is an even number exceeding three, convex surfaces with strong bulging are alternately formed and arranged on the front surface and the rear surface in the rotation direction. Since the directions of the fluid generated by the front and rear lift blades alternately face the front and rear directions, there is an effect that fluid interference is unlikely to occur.

It is a front view of one Embodiment of the horizontal axis rotor of this invention. It is a side view of the upright blade in FIG. FIG. 1 is an enlarged side view taken along the line FF in FIG. FIG. 1 is an enlarged side view taken along the line EE in FIG. FIG. 1 is an enlarged side view of the DD line longitudinally in FIG. FIG. 1 is an enlarged side view taken along the line CC in FIG. FIG. 1 is an enlarged side view taken along the line BB in FIG. It is an enlarged side view of the AA line longitudinal section in FIG. It is a flow path explanatory view of the blade of FIG. It is an enlarged plan view of the upright blade of FIG. It is a front view of another embodiment of the horizontal axis rotor of this invention.

Embodiments of the present invention will be described with reference to the drawings. The horizontal axis rotor 1 has three lift-type blades 3 (hereinafter, simply referred to as blades) arranged at equal intervals on the peripheral surface of the hub 2 when viewed from the front. If the number of blades 3 is small, the receiving area is small, and if the number of blades 3 is large, turbulence is generated due to the interference of the flowing fluid during rotation, and the rotation efficiency is lowered.

In the front surface 3C of the blade 3, the central part of the chord length is set as the point O at the substantially central part of the length, the wing root part is set as the base 3A from the point O, and the wing tip portion increases from the point O toward the rearward direction of rotation. It is bent to form a laterally inclined portion 3B.
The length along the front edge 3E is longer than the length along the trailing edge 3E, but the radius of gyration is smaller than the lengths of the front edge 3D and the trailing edge 3E.

The intersection angle between the center line S of the base portion 3A in the direction from the center point O in the longitudinal direction of the blade 3 to the blade root direction and the center line T of the laterally inclined portion 3B in the blade tip direction from the center point O is shown in FIG. In 1, it is set to 125 degrees, but it can be arbitrarily set in the range of 120 degrees to 140 degrees.
If the intersection angle is smaller than this, it becomes difficult for the fluid to pass within the radius, and if it is large, it becomes closer to a straight line, and the meaning of forming the laterally inclined portion 3B is diminished.

The base portion 3A is formed so that the chord length gradually increases from the wing root toward the center point O, and the chord length at the intersection of the center line S and the center line T is formed as the maximum chord length portion 3F. ing. This is because the fluid moves from the blade root to the laterally inclined portion 3B and collects, and the collected fluid passes in an arc in the trailing edge 3E direction, and as a reaction, the blade 3 is moved toward the front edge direction. Rotate to increase rotation efficiency.

In a side view, as shown in FIG. 2, the laterally inclined portion 3B is inclined toward the front of the front surface 3C from the boundary portion of the base portion 3A to form the forward inclined portion 3H. The inclination angle of anteversion in FIG. 2, but are set to about 2 5 times anterograde inclined with respect to the base 3A, it is arbitrarily set in a range of 2 0 ° to 4 5 °.

When viewed from the front, the bending angle between the base portion 3A and the laterally inclined portion 3B at the trailing edge 3D is larger than the bending angle between the base portion 3A and the laterally inclined portion 3B at the front edge 3D. As a result, the fluid that hits the front edge 3D of the laterally inclined portion 3B passes in the direction of the trailing edge 3E with a small resistance, and is in the middle where the trailing edge 3E at the base portion 3A and the trailing edge 3E at the laterally inclined portion 3B intersect. , U Pass in the direction of the arrow.

Further, as shown in FIG. 9, in the laterally inclined portion 3B, the fluid passing from the front edge 3D to the trailing edge 3E flows in the direction indicated by the arrow V and flows inside the radius line X.
The flow velocity becomes higher than the flow velocity inside the U arrow line at the base 3A due to the difference in the radius of gyration, and the reaction acts in the opposite direction of the V arrow line to increase the rotation efficiency of the blade 3.

As a result, the fluid passing through the trailing edge 3E of the base portion 3A and the fluid passing through the trailing edge 3E of the laterally inclined portion 3B gather in the direction of the U arrow line and pass therethrough. As a reaction, a rotational force in the opposite direction of the V arrow line is obtained to efficiently rotate the blade 3.

3 to 8 are enlarged cross-sectional views of each cross section of the blade 3 in FIG. 1.
The tip slope line G that slopes from the front edge 3D of the front edge 3C to the trailing edge 3E at the tip of the laterally inclined portion 3B is the same in both FIGS. 3 to 8, but at the end face of each cross section, from the front edge 3D. The intermediate gradient line E that slopes toward the trailing edge 3E differs depending on each portion.

That is, the intersection angle between the tip gradient line G and the intermediate gradient line E is about 32 degrees in FIG. 3, about 32 degrees in FIG. 4, about 30 degrees in FIG. 5, about 30 degrees in FIG. 6, and in FIG. 7. Is about 28 degrees, and in FIG. 8, it is about 25 degrees.

This indicates that the trailing edge 3E portion in the front surface 3C gradually moves in the front direction of the front surface from the wing root portion of the base portion 3A to the wing tip of the laterally inclined portion 3B. However, this is because the laterally inclined portion 3B is inclined in the lateral direction but has the same crossing as the base portion 3A, and as shown in FIG. 10, between the tip gradient line G and the intermediate gradient line E. The fluid will pass through.

As shown in the cross sections of FIGS. 3 to 8, the rear surface G has a convex surface that bulges more than the front surface 3C, and the distance from the front edge 3D to the rear edge 3E is larger than that of the front edge 3C. It has become. As a result, the fluid hitting the front surface 3C pushes the blade 3 in the front edge 3D direction to rotate the blade 3.

Further, the velocity of the fluid passing along the rear surface 3G of the large convex surface is larger than the velocity of the fluid passing along the front surface 3C, and the fluid pressure decreases when the flow velocity is large. Due to the difference in fluid pressure between the 3C and the rear surface 3G, the blade 3 is pushed toward the front edge 3D where the fluid pressure is low, and the rotation efficiency is increased.

FIG. 11 is a front view of the horizontal axis rotor of another embodiment. The same members as in the previous example are designated by the same reference numerals, and the description thereof will be omitted. In this embodiment, four blades 3 are arranged on the peripheral surface of the hub 2. The shape of the blade 3 is basically the same as that of the previous example, but the front surface 3C is the rear surface 3G, the rear surface 3G is the front surface 3C, and the blades shown in FIG. 1 are alternately arranged.

In this way, when the number of blades 3 increases to 4 or 6, the fluid passing at high speed from the front and rear blades 3 is separated in the front-rear surface direction by the Coanda effect, and fluid interference occurs during high-speed rotation. The effect of being difficult occurs. The horizontal axis rotor of the present invention can be used for a wind power generator and a hydroelectric generator.

Since the laterally inclined portion is formed at the blade tip, the fluid moving from the blade root to the blade tip during rotation is suppressed by the laterally inclined portion and passes in the inner direction of the diameter circle, so that the rotation efficiency is increased and power generation is performed. It is used for highly efficient hydroelectric power generation.

1. 1. Horizontal axis rotor 2. Hub 3. Lift type blade 3A. Base 3B. Lateral inclined portion 3C. Front 3D. Front edge 3E. Trailing edge 3F. Maximum string length 3G. Rear surface 3H. Forward inclined surface 4. Rotor shaft E. Intermediate gradient line G. Tip gradient line O. Center point S. Base string center line T.I. Horizontally inclined string center line U.S. Intermediate fluid passage direction V. Fluid passage direction of the laterally inclined portion X. Radius line of rotation

Claims (4)

In the front view of the hub in a fixed lift type blade rotor, the central portions middle nearly spanwise the maximum chord length portion, towards the blade root from the maximum chord length portion and the base, over the boundary between the hub with gradually smaller the chord length Te, the maximum chord length unit said maximum chord length portion as tapered over the tip to form a sideways inclined portion greatly bent to the trailing edge direction as a base point from, lateral direction inclined portion Is a horizontal axis characterized in that the front surface from the boundary with the base portion to the wing tip is inclined forward with respect to the front surface of the base portion with the maximum chord length portion as a base point in a lateral view. Rotor. In the front view of the front KiAge force type blade, a center line S of the width of the base passing through the central portion O of the chord length at substantially the center portion of the length of該揚force type blade, the center line of the width of the lateral direction inclined portion and a T, intersect at a range of 120 degrees to 14 0 °, in plan view in a state of upright the base, the lateral direction inclined portion and a tapering tip, the said maximum chord length portion as a base point The horizontal axis rotor according to claim 1, wherein the rotor projects obliquely forward from the trailing edge of the base . In a front view of the front KiAge force type blade, with respect to the center line T of the width of the lateral direction inclined section intersecting the center line S of the width of the base portion, the leading edge of the horizontal direction ramps, intermediate its length The horizontal axis rotor according to claim 1 or 2 , wherein the portion is an arc curved surface protruding outward . Oite when the even more than three sheets of pre KiAge force type blade, alternately lift type blade is largely swell convex on one side, in the front and back in the direction of rotation, the surface and not a surface with the convex surface in front view The horizontal axis rotor according to any one of claims 1 to 3 , wherein the rotor is formed and arranged in a manner.

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