JP6928325B1 - Horizontal axis wind turbine, horizontal axis rotor and rotor blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a horizontal axis wind turbine, a horizontal axis rotor and a rotor blade, which are less likely to interfere with airflow during rotation even if the number of blades is large and have high rotation efficiency even at a low wind speed. SOLUTION: A plurality of lift type blades are arranged on a peripheral surface of a hub, and each lift type blade has a base portion 6A of a lift type blade facing the axial direction of the hub 5A in a front view with the blade tip facing upward. The blade center line S passing through the axis of the hub 5A passes through the center of the thickness. The rotating front surface 6G of the leading edge 6B of the lift type blade 6 is parallel to the blade center line S, is greatly bent in the rearward rotation direction from the middle of the length to the blade tip, and the blade tip surface 6D of the blade tip is horizontally and horizontally long in front. The trailing edge end 6c of the wing tip surface 6D is on the outside of the rotation locus V of the thickness center 6E of the leading edge of the wing tip surface 6D, and extends from the base portion 6A to the wing tip surface 6D. A horizontal axis windmill in which the 6th floor of the rotating rear surface is formed so that it can be seen from the front. [Selection diagram] Fig. 1

Description

The present invention relates to a horizontal axis wind turbine, a horizontal axis rotor, and a rotor blade, which are less likely to cause interference of airflow passing through during rotation, have excellent rotational performance, and have high rotational torque even at low wind speeds.

The horizontal axis rotor of the horizontal axis wind turbine is described in, for example, Patent Document 1.

JP-A-2018-40304

In the horizontal axis rotor described in Patent Document 1, the front shape of the blade is a laterally inclined portion in which the middle portion in the vertically long direction is the maximum chord length portion and is greatly bent in the rearward rotation direction from the maximum chord length portion to the wing tip. The laterally inclined portion is inclined forward in the front direction from the maximum chord length portion to the wing tip in a side view. As a result, the airflow that hits the front of the blade collects at the maximum chord length portion and passes in the rearward direction of the rotation of the rotor to improve the rotation efficiency. In the passing direction of this air flow, it is difficult to increase the efficiency in the low wind speed range because interference occurs when there are many blades.
The present invention provides a horizontal axis wind turbine, a horizontal axis rotor, and a rotor blade, in which interference of airflow passing between each blade is unlikely to occur even if the number of blades is increased, and the rotation efficiency and rotation torque are high even at a low wind speed. I am aiming.

The present invention has taken the following technical measures in order to solve the above problems.

(1) In a configuration in which the wind turbine housing 4 is horizontally supported by the rotary support 3 rotatably arranged on the support column 2, the front of the rotary support 3 in which the front axle 3C and the rear axle 3D are erected. The rod 3C horizontally supports the tip 4A of the windmill housing 4, the rear rod 3D horizontally supports the rear end 4B of the windmill housing, and the tip 4A of the windmill housing 4 and the tip 4A are said. A horizontal axis rotor 5 is arranged between the rear end portions 4B so that the front and rear and the center of the width of the hub 5A overlap with the strut axis core line U of the strut 2, and the tip portion of the windmill housing 4 is provided. Generators 4C and 4D are arranged on the 4A and the rear end portion 4B so that their respective rotation shafts 4E and 4F are on the same axis, and the lateral sides are provided between the front and rear rotation shafts 4E and 4F. The front and rear ends of the rotating shafts 5B and 5C fixed to the center of the hub 5A of the shaft rotor 5 are connected to enable coaxial rotation of the horizontal shaft rotor 5, and the horizontal shaft rotor 5 moves the rotating shafts 5B and 5C back and forth. A plurality of lifting blades 6 are fixed to the peripheral surface of the hub 5A in the radial direction at regular intervals in a facing state, and the lifting blades are viewed from the front with the blade tips of the lifting blades 6 facing upward. base 6A of 6, before along the center of the thickness of the edge 6B the blade center line S passing through the axis of the hub 5A, rotating front 6G of the front edge 6B is formed parallel to the said blade in the core wire S In addition, the rotating front surface 6G is greatly bent in the rearward rotation direction from the middle of the wing length to the wing tip, and the wing tip surface 6D having a thick front edge 6B and a thin point toward the trailing edge end 6C is made horizontally long in the front. To make it visible, the trailing edge 6C from the base 6A to the wing tip gradually inclines in the rearward rotation direction and sharply bends as it approaches the wing tip surface 6D , and the trailing edge 6D of the wing tip surface 6D is made visible. The trailing edge end 6c of the blade tip surface 6D is formed to be outside the rotation locus V of 6E, and the rotation rear surface 6F from the base portion 6A to the blade tip surface 6D is visible from the front. A horizontal axis wind turbine formed so that the rotation locus of the trailing edge end 6c on the blade tip surface 6D overlaps the strut axis core line U of the strut 2.

(2) The rotation locus V of the leading edge end 6E on the blade tip surface 6D of the lift type blade 6 is larger than the rotation locus X of the front end surface 5E on the hub 5A of the horizontal axis rotor 5 in a plan view. It is formed so as to be located in front of the front surface, so that the rotation locus of the trailing edge end 6c on the blade tip surface 6D of the lift type blade 6 overlaps with the rotation locus R of the front and rear centers of the rotor 5 in the hub 5A. The horizontal axis wind turbine according to (1) above, wherein the lift type blade 6 is formed.

(3) A plurality of lift type blades 6 are radiated in the radial direction on the peripheral surface of the hub 5A on which the front and rear ends of the rotating shafts 5B and 5C of the hub 5A of the horizontal shaft rotor 5 are projected back and forth. The base end surface of the base portion 6A of each lift type blade 6 has a shape in which the front edge portion is thick and gradually becomes thinner toward the rear end, and the front and rear of the base portion 6A are aligned with the axis facing the front and rear of the hub 5A. A blade that is set to follow and passes through the center of thickness of the leading edge 6B of the base portion 6A of the lift-type blade 6 and the axis of the hub 5A in a front view with the wing tip of the lift-type blade 6 facing upward. Along the center line S, the rotating front surface 6G facing the leading edge 6B in the rotation direction is formed parallel to the blade center line S, and from the middle of the length of the lift type blade 6 to the tip of the blade. The wing tip surface 6D of the lift type blade 6 is formed substantially horizontally toward the front by bending the wing tip surface 6D significantly in the rearward direction of rotation. The wing is sharpened so that the trailing edge end 6c on the wing tip surface 6D is outside the rotation locus V of the leading edge end 6E on the wing tip surface 6D, and the wing is formed from the base 6A of the lift type blade 6. A horizontal axis rotor that allows the entire 6F of the rotating rear surface, which is rearward in the rotating direction, to the leading edge surface 6D to be seen from the front.

(4) The horizontal shaft rotor 5 is supported with the front and rear rotating shafts 5B and 5C of the hub 5A facing forward and backward between the front end portion and the rear end portion of the wind turbine housing 4 which is long in the front and rear. Front and rear rotating shafts 5B and 5C protruding from the center of the hub in the front-rear direction are installed in the front end 4A and the rear end 4B of the wind turbine housing. The horizontal axis rotor according to (3) above, which is concentrically connected to the tips of 5B and 5C via fittings 5D and 5D.

(5) In the front view of the lift type blade 6 in the horizontal axis rotor 5 in a state where the lift type blade 6 is fixed to the hub 5A and the blade tip is vertically upward, the center of the thickness of the base portion 6A of the lift type blade 6 is set. The blade center line S to pass through is assumed to pass through the axis of the hub 5A, the leading edge 6B of the lift type blade 6 is directed to the front, and the rotating front surface 6G at the time of rotation is set to rotate forward in parallel with the blade center line S. Then, the trailing edge 6C rises diagonally toward the wing tip, and from the middle of the wing length to the wing tip, it is greatly bent in the rearward rotation direction, and the wing tip surface 6D appears horizontally and horizontally in front of the blade. It is formed so that the trailing edge end 6c on the blade tip surface 6D is outside the rotation locus V of the leading edge end 6E of the leading edge 6B on the blade tip surface 6D, and extends from the base portion 6A to the blade tip surface 6D. The rotating rear surface 6F is formed so that the entire surface can be seen from the front, and the plan view of the lift type blade 6 is such that the rotating front surface 6G is a semicircle with a wide rear portion and is pointed toward the trailing edge end 6c following the semicircular shape. The rotation locus T of the leading edge 6B on the blade tip surface 6D is a rotor blade that protrudes in front of the rotation locus X of the front end surface 5E of the hub 5A.

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

In the invention described in (1) above, the horizontal shaft rotor 5 projects its rotating shafts 5B and 5C back and forth, and the front and rear rotating shafts 5B and 5C are the front end 4A and the rear end 4B of the wind turbine housing 4. Since it is supported by both sides in the middle, the horizontal axis rotor 5 is less likely to vibrate and can rotate stably.
Since the horizontal axis rotor 5 has a plurality of lift type blades 6 arranged on the peripheral surface of the hub 5A, the wind receiving area is wide, the rotation efficiency is high even at a low wind speed, and the rotation torque is also high.
When a plurality of lift-type blades 6 are arranged, interference of the passing airflow generated between the lift-type blades 6 due to the rotation of the horizontal axis rotor 5 occurs, the rotation efficiency decreases, or noise is likely to occur. Since the shape of the lift type blade 6 is formed into an unprecedented special shape, this is solved.
That is, in the lift type blade 6 having the blade tip facing upward in the front facing upwind, the base portion 6A faces long in the front-rear direction, and the blade center line S passing through the axis of the hub 5A is located at the center of the thickness. It is formed vertically. The rotating front surface 6G facing the rotation direction at the leading edge 6B visible on the front surface of the lift type blade 6 is formed parallel to the blade center line S, and bends from the middle of the length toward the blade tip in the rearward rotation direction. , The wing tip surface 6D is formed so as to be horizontally long on the front surface. In the part near the tip of the lift type blade 6 that rotates at high speed in the centrifugal part during rotation, wind resistance is less likely to be applied, and the airflow that passes through due to the Coanda effect becomes high speed, and as a result, it passes under negative pressure. Even if the arrangement interval of the lift type blades 6 before and after rotation on the peripheral surface of the hub 5A is narrow, there is a feature that interference interference of the passing airflow is unlikely to occur.
The lift type blade 6 is formed so that the rotating rear surface 6F, which is in the rear direction of rotation during rotation from the base portion 6A to the blade tip surface 6D, can be seen from the front. That is, the airflow that hits the front surface of the horizontal axis rotor 5 hits the rotation rear surface 6F of the lift type blade 6 and slides on the diagonal surface thereof to pass diagonally in the rearward direction of rotation and pushes out the lift type blade 6 in the rotation direction. Rotates the horizontal axis rotor 5 by In this case, the airflow moving in the centrifugal direction from the base portion 6A of the lift type blade 6 passes obliquely in the rearward direction in the rotation axis 5B direction at the trailing edge end 6c portion of the blade tip surface 6D protruding in the front direction. Then, due to the reaction, the lift-type blade 6 is strongly pushed out in the leading edge 6B direction and rotated in the rotary centrifuge portion of the lift-type blade 6.

In the invention described in (2), the rotation locus V of the leading edge end 6E on the blade tip surface 6D of the lift type blade 6 is the front end surface 5E of the hub 5A of the horizontal axis rotor 5. It is formed so as to be located in front of the rotation locus X in a plan view, and the rotation locus R of the trailing edge end 6c on the blade tip surface 6D is a rotation locus of the center of the horizontal axis rotor 5 in the front and rear of the hub 5A. Since the lift type blade 6 is formed so as to overlap with R, the wing tip surface 6D, which can be seen from the front when viewed from the front, projects forward from the rotation locus R at the center of the front and rear of the hub 5A, and at the same time, is flat. Visually, the wing tip surface 6D is inclined in the rear direction from the leading edge end 6E to the trailing edge end 6c, and is followed by an air flow that hits the rotating rear surface 6F at the wing tip portion of the lift type blade 6. The lift type blade 6 is passed along the rotating front surface 6G along with the airflow passing at high speed to improve the rotation efficiency.

In the invention described in (3) above, a plurality of lift type blades 6 are provided on the peripheral surface of the hub 5A in which the front and rear ends of the rotating shafts 5B and 5C of the hub 5A of the horizontal shaft rotor 5 are projected forward and backward, respectively. The base end surface of the base portion 6A of each lift type blade 6 is fixed in the radial direction at regular intervals, and the front edge portion is thick and the shape is gradually thinned toward the trailing edge end, and the front and rear of the base portion 6A are hubbed. Since it is set along the axis W facing the front and back of 5A, the base 6A is long in the front and back, and the airflow from the front can pass through with little resistance, and the rotation efficiency is improved.
The thickness center of the front edge 6B of the base portion 6A of the lift-type blade was aligned with the blade center line S passing through the axis of the hub 5A in a front view with the blade tip of the lift-type blade 6 facing upward. In this state, the rotation front surface 6G facing the rotation direction of the front edge 6B is formed parallel to the blade center line S, and is greatly bent in the rearward rotation direction from the middle of the length of the lift type blade 6 to the blade tip. Since the blade tip surface 6D of the lift-type blade 6 is formed to be substantially horizontally and horizontally long toward the front, the front view of the lift-type blade 6 is such that the rotating front surface 6G is vertical and the trailing edge 6C is from the base portion 6A. It is inclined toward the tip of the blade in the rearward direction of rotation, and the rear surface 6F of the rotation expands in the direction of the tip of the blade and the wind receiving area is wide in the distal portion, so that the rotational torque becomes high.
The wing tip surface 6D has a thick leading edge 6B portion and is pointed toward the trailing edge end 6c, and the trailing edge end 6c on the wing tip surface 6D is larger than the rotation locus V of the leading edge end 6E on the wing tip surface 6D. Since it is designed to be on the outside, the airflow that hits the rotating rear surface 6F escapes to the outside at the trailing edge end 6c of the blade tip surface 6D, and is pushed out in the direction of the leading edge end 6E of the blade tip surface 6D by reaction. Since the entire rear surface of the rotation 6F, which is behind the rotation direction from the base 6A of the lift blade 6 to the tip surface 6D of the blade, is visible from the front, most of the airflow that hits the lift blade 6 from the front rotates. Since it hits the rear surface 6F, passes diagonally behind, and rotates the lift type blade 6 as a reaction, the rotation efficiency is high.

In the horizontal shaft rotor 6 according to the invention described in (4) above, the rotating shafts 5B and 5C of the hub 5A are directed forward and backward between the front end portion 4A and the rear end portion 4B of the wind turbine housing 4 which is long in the front-rear direction. Since the hub 5A is supported by both sides, it is less likely to vibrate and rotational stability is improved. Front and rear rotating shafts 5B and 5C that project from the axis of the hub 5A in the front-rear direction are installed in the front end portion 4A and the rear end portion 4B of the wind turbine housing 4, respectively, and are of the same type in the front and rear. Since it is concentrically connected to the tips of the rotating shafts 4E and 4F of the 4C and 4D via the fittings 5D and 5D, blurring is unlikely to occur and the rotating shafts 5B and 5C before and after the hub 5A are covered. The load of the generators 4C and 4D is even, and the smooth rotation enhances the power generation efficiency associated with the rotation efficiency.

The lift-type blade 6 in the horizontal axis rotor 5 according to the invention described in (5) above is a blade center passing through the center of the thickness of the base 6A of the lift-type blade 6 in a front view with the blade tip facing vertically upward. The line S is assumed to pass through the axis of the hub 5A, the leading edge 6B of the lift type blade 6 is directed to the front, and the rotating front surface 6G at the time of rotation is set to be rotated forward in parallel with the blade center line S. The trailing edge 6C rises diagonally toward the rearward rotation of the blade tip, and is greatly bent in the rearward rotation direction from the middle of the blade length to the blade tip, and the blade tip surface 6D appears horizontally and horizontally in front. Since the trailing edge end 6c on the wing tip surface 6D is formed so as to be outside the rotation locus V of the leading edge end 6E of the leading edge 6B on the wing tip surface 6D, the wing tip surface is viewed from the side. The leading edge 6B of the 6D projects forward in the front and can be captured by wrapping the airflow received in the front, and the airflow passes outward from the trailing edge end 6c facing the rear outer side in the rearward rotation direction.
Since the rotating rear surface 6F from the base portion 6A to the wing tip surface 6D is formed so that the entire surface can be seen from the front, the airflow hit from the front is received by the rotating rear surface 6F, and the airflow hits from the front is received from the base portion 6A to the wing tip. It moves, hits the wing tip surface 6D projecting laterally forward, passes diagonally backward from the trailing edge 6C, and rotates the lift type blade 6 as a reaction.
The plan view of the lifting blade 6 is a semicircular shape in which the rotating front surface 6G extends rearward in rotation, and is pointed toward the trailing edge end 6c following the rotation front surface 6G, and the rotation locus T of the front edge 6B on the blade tip surface 6D. Is projected in the front direction from the rotation locus X of the front end surface 5E of the hub 5A. Increases rotational efficiency by passing airflow in the direction.

It is a front view of Example 1 of the horizontal axis wind turbine of this invention. In the side view of FIG. 1, the left side is the front. In the plan view of FIG. 1, the left side is the front. It is a partial cross-sectional view of the wind turbine housing in FIG. It is an enlarged front view of the lift type blade in FIG. It is a top view of the lift type blade in FIG.

An embodiment of the present invention will be described with reference to the drawings. In the figure, the horizontal axis wind turbine 1 rotatably supports the rotary support 3 on the upper part of the support column 2. The rotary support 3 is formed in a substantially U shape on the shaft portion 3A by a base portion 3B which is long in the front-rear direction in a side view, and a front rod 3C and a rear rod 3D which rise upward at the front-rear end portion. The front rod 3C and the rear rod 3D are formed in a substantially fish shape having a cross-sectional shape, the front portion being thick and the rear rod being thinned toward the rear end. As a result, the airflow that hits the front rod 3C and the rear rod 3D from the front passes through with a small resistance.

The front end portion 4A and the rear end portion 4B of the cavity of the wind turbine housing 4 are fixedly supported on the upper portion of the rotary support 3 at predetermined intervals. In the wind turbine housing 4, the front end portion 4A is fixedly supported on the front rod 3C of the rotary support 3, and the rear end portion 4B is fixedly supported on the rear rod 3D of the rotary support 3. Inside the front end portion 4A and the rear end portion 4B, as shown in FIG. 4, generators 4C and 4D of the same type are installed concentrically with the tips of the rotating shafts 4E and 4F facing each other in the front-rear direction. Has been done.

The central portion of the wind turbine housing 4 is a hub 5A of the horizontal axis rotor 5, and the rotation locus R of the center of the front and rear of the hub 5A is set on the central axis U of the support column 2 as shown in FIG. There is. Inside the hub 5A, as shown in the cross-sectional view in FIG. 4, the rotating shafts 5B and 5C are long in the front-rear direction, and the front-rear end portions thereof are arranged in the front-rear direction of the wind turbine housing 4 generators 4C and 4D. It is concentrically connected to the opposite ends of the rotating shafts 4E and 4F facing the front and back of the above via the connecting tools 5D and 5D.

In FIG. 4, the hub 5A of the horizontal axis rotor 5 is located between the rotating shaft 4E projecting backward from the front generator 4C and the rotating shaft 4F projecting forward from the rear generator 4D. The tips of the forward rotation shaft 5B and the rearward rotation shaft 5C are concentrically and rotatably connected via the connectors 5D and 5D.

The generators 4C and 4D before and after this are of the same model, and only the protruding directions of the rotating shafts 4E and 4F are changed back and forth. Therefore, the front and rear generators 4C and 4D are rotated in the same direction by the rotation of the horizontal axis rotor 5, and each generates electricity uniformly.

The electricity generated by the front and rear generators 4C and 4D is a storage battery (not shown) in which a cord (not shown) passing through the front rod 3C and the rear rod 3D of the rotary support 3 is arranged in the lower support column 2. It is connected to the storage battery so that it can be stored in the storage battery or distributed to other places.

In the horizontal shaft rotor 5, since the rotating shafts 5B and 5C protruding to the front and rear opposite sides of the hub 5A are not supported by bearings, frictional resistance is not applied by the bearings, and the front and rear generators 4C directly. Since it is directly connected to the 4D rotating shafts 4E and 4F concentrically, blurring is unlikely to occur, and the efficiency of transmitting wind power directly to the generators 4C and 4D is improved.

Also, in order to obtain the same amount of power generation, it is difficult to start with a large generator at low wind speed and time loss occurs, but by using two small generators with the same amount of power generation, starting is quick even at low wind speed. As a result, the wind speed is not constant and the wind stops, so the amount of power generated within a certain period of time is greater for the small generator due to the quick start, and the power generation efficiency is higher. Increase.

A rudder 7 is vertically erected on the upper surface of the rear end portion 4B of the wind turbine housing 4, and is in contact with the rear rod 3D of the rotary support 3 on the lower surface of the rear end portion 4B. As described above, the lower rudder 8 is arranged vertically in the front-rear direction.
As a result, the rotary support 3 instantly rotates even when the wind direction changes, and the front surface of the horizontal axis rotor 5 is always directed upwind to receive the wind power on the front surface of the lift type blade 6 for highly efficient power generation. Can be made to.

In the horizontal axis rotor 5, eight lift blades 6 are arranged at equal intervals in front view on the peripheral surface of the hub 5A. However, the number of the lift blades 6 is not limited to this number, and unlike the conventional blades, the lift type blades 6 have a special shape, so even if a large number of the blades are arranged, they pass between the lift type blades before and after rotation. Interference generated in the airflow is unlikely to occur, and as a result, it is possible to rotate with a high rotational torque even at a low wind speed.

That is, as shown in a plane in FIG. 6, the wing tip surface 6D of the lift type blade 6 has a trailing edge end 6c on the rotation locus R at the center of the front and rear of the hub 5A, and the wing tip surface 6D. Since the leading edge 6B projects diagonally forward from the front end surface 5E of the hub 5A, the airflow passing along the rotating rear surface 6F is not in the rearward direction of the lift type blade 6 but on the horizontal axis. Since it comes out along the peripheral surface of the rear end portion 4B of the wind turbine housing 4 in the rearward direction of the rotor 6, interference of the airflow passing between the lift type blades 6 is unlikely to occur.

As shown in FIG. 4, the front surface of the lift type blade 6 is parallel to the blade center line S passing through the center of the hub 4, and the leading edge 6B faces the front surface, but rotates greatly toward the blade tip. It is bent in the rear direction, the trailing edge 6C gradually rotates from the base 6A toward the wing tip and inclines in the rear direction, and the wing tip surface 6D has a wide front part and draws an arc toward the rear part. It is formed like a bird's beak, thin and horizontally long, facing the front.

In FIG. 5, since the trailing edge end 6c of the blade tip surface 6D is outside the rotation locus V of the leading edge end 6E at the center of the thickness of the leading edge 6B of the blade tip surface 6D, the lift type blade The airflow passing from the base portion 6A toward the blade tip surface 6D along the rotating rear surface 6F of No. 6 passes outward on the back surface at the trailing edge end 6c. That is, it passes in the direction behind the rear end portion 4B along the peripheral surface of the wind turbine housing 4 in FIG.

Further, as shown in FIG. 2, the rotation locus T of the leading edge 6B of the wing tip surface 6D is located in front of the rotation locus X of the tip surface 5E of the hub 5A, but the wing tip surface. The rotation locus R of the trailing edge end 6c of 6D is positioned so as to overlap the rotation locus R of the center in the front and rear of the hub 5A.

This indicates that the wing tip surface 6D protrudes in the front direction from the center of the base portion 6A in a plan view, and the airflow that hits the rotating rear surface 6F near the wing tip surface 6D is surrounded by a frame. The rotation efficiency is increased by passing from the trailing edge 6C of the rotation rear surface 6F toward the back surface.

As shown in FIG. 3, the rotating rear surface 6F (appearing on the front surface in FIGS. 1 and 5) with respect to the rotation direction of the base portion 6A of the lift type blade 6 is the axial core line of the wind turbine housing 4. Although it is fixed to the hub 4 in parallel with W, the cross section indicated by reference numeral 31 at the position of the axis W in FIG. 3 shows the cross section of lines 31-31 in FIG. The trailing edge 6C of the lift-type blade 6 with respect to the axial core line W of No. 4 is inclined in the range of 38 ° to 40 ° in the rearward rotation direction.

The cross section indicated by reference numeral 32 in FIG. 3 shows the cross section taken along the line 32-32 in FIG. 5, and the rotating rear surface 6F thereof is in the range of 28 degrees to 30 degrees with respect to the axis W of the wind turbine housing 4. The trailing edge 6C is tilted inward.

That is, in the lift type blade 6, the rotating rear surface 6F of the base portion 6A is parallel to the axis W of the wind turbine housing 4, but the trailing edge 6C gradually rotates more than the leading edge 6B toward the blade tip direction. In the wing tip surface 6D, the trailing edge 6c is tilted in the rear direction to the rotation locus R at the center of the front and rear of the hub 5A in the front direction.

As a result, the airflow that hits the lift-type blade 6 from the front flows in the rear direction along the axis W of the wind turbine housing 4 at the base 6A, and the trailing edge 6C becomes the wind turbine housing as it goes toward the blade tip. It is closer to the axis W of the column 4 and closer to the axis U of the support column 2.

Further, as can be clearly seen from the cross section of the lift-type blade 6 in FIG. 3, the rotation front surface 6G facing the front of the rotation of the lift-type blade 6 bulges greatly from the leading edge 6B to the center of the string. Since the airflow along the rotating front surface 6G escapes at high speed toward the back surface of the axis W of the wind turbine housing 4 due to the Coanda effect, the air pressure generated on the rotating front surface 6G is lower than the air pressure generated on the rotating rear surface 6F. Due to this difference in atmospheric pressure, it is attracted toward the front surface of rotation and rotates at high speed.

Further, since the airflow along the rotation front surface 6G of the lift type blade 6 passes at high speed, even if the number of lift type blades 6 is large, the airflow interference caused by the rotation of the lift type blades 6 before and after the rotation is unlikely to occur. It is characterized by high rotational efficiency even at low wind speeds and strong rotational torque of the rotor 5.

As shown in the plane shown in FIG. 6, the lift type blade 6 has the base portion 6A at the center of the hub 5A with the blade tip facing upward, but the trailing edge end 6c of the blade tip rotates from the center of the base portion 6A. The large distance to the rear is very different from the conventional vertically elongated blade forming the forward inclined portion.

Therefore, unlike the forward inclined portion of the vertically elongated blade having the conventional forward inclined portion, the blade tip surface 6D at the blade tip is formed horizontally and horizontally long in the front view, and the leading edge of the blade tip surface 6D in the plan view. 6B is rotationally rearward of the base 6A and protrudes in front of the front 5A of the hub 5A, and the trailing edge end 6c of the wing tip surface 6D is on the rotation locus R of the center of the base 6A in a plan view and rotates. Since the trailing edge 6C of the rear surface 6F is inclined toward the rear surface, the middle of the length of the trailing edge 6C protrudes toward the rear surface more than the back surface of the base portion 6A, and extends toward the wing tip to reach the wing tip surface 6D. The trailing edge 6c protrudes in the front direction.

As described above, the lift type blade 6 is inclined in the rear direction from the leading edge 6B to the trailing edge 6C up to the middle of the length, and is bent from the middle of the length of the lift type blade 6 to be a wing. Gradually extending toward the rear end of the front rotation, the wing tip surface 6D projects its leading edge 6B from the front 5E of the hub 5A to the front front, more than half the length of the lift blade 6. Since the portion extending to the wing tip wraps the airflow that hits the front and allows the airflow to pass collectively toward the back surface of the wing tip behind the rotation, the rotation efficiency and the power generation efficiency can be improved even at a low wind speed.

The horizontal axis wind turbine, horizontal axis rotor, and rotor blade according to the present invention are used in a wind power generator because they have high rotational efficiency and high rotational torque even at low wind speeds. Further, the horizontal axis rotor and rotor blade can be used for a hydroelectric power generation device.

1. 1. Horizontal axis windmill 2. Prop 3. Rotating support 3A. Shaft 3B. Base 3C. Front rod 3D. Rear rod 4. Wind turbine housing 4A. Front end 4B. Rear end 4C. Front generator 4D. Rear generator 4E. Backward rotation shaft 4F. Forward rotation axis 5. Horizontal axis rotor 5A. Hub 5B. Forward rotation shaft 5C. Backward rotation shaft 5D. Connector 5E. Front end face 6. Lift type blade 6A. Base 6B. Leading edge 6C. Trailing edge 6c. Trailing edge 6D. Wing tip surface 6E. Leading edge edge 6F. Rotating rear surface 6G. Rotating front 7. Rudder
8. Lower rudder R. Hub center rotation locus (blade end face trailing edge rotation locus)
S. Blade center line T. Rotational locus of the center of the front edge of the wing tip U.S. Strut axis core line V. Wing tip surface front edge end rotation locus W. Wind turbine housing axis X. Front end face rotation locus of hub Y. Rotational trajectory of the rear end face of the hub

Claims (5)

In a configuration in which the wind turbine housing 4 is horizontally supported by the rotary support 3 rotatably arranged on the support column 2, the front axle 3C in the rotary support 3 on which the front axle 3C and the rear axle 3D are erected The tip 4A of the windmill housing 4 is horizontally supported, the rear end 4B of the windmill housing is horizontally supported by the rear axle 3D, and the tip 4A and the rear end of the windmill housing 4 are supported horizontally. A horizontal axis rotor 5 is arranged between 4B so that the front and rear and the center of the width of the hub 5A overlap with the support axis core line U of the support 2, and the tip portion 4A of the windmill housing 4 and the tip portion 4A and the said. Generators 4C and 4D are arranged at the rear end 4B so that their rotating shafts 4E and 4F are on the same axis, and the horizontal shaft rotor 5 is located between the front and rear rotating shafts 4E and 4F. The horizontal shaft rotor 5 is coaxially rotatable by connecting the front and rear ends of the rotary shafts 5B and 5C fixed to the center of the hub 5A, and the horizontal shaft rotor 5 is in a state where the rotary shafts 5B and 5C are directed forward and backward. Then, a plurality of lift-type blades 6 are fixed to the peripheral surface of the hub 5A at regular intervals in the radial direction, and the base portion of the lift-type blade 6 is viewed from the front with the blade tips of the lift-type blade 6 facing upward. 6A is along the blade center line S center of the thickness of the front edge 6B is passing through an axis of the hub 5A, rotating front 6G of the front edge 6B is formed in parallel with the blade in the core wire S, and From the middle of the wing length to the wing tip, the rotating front surface 6G is greatly bent in the rearward rotation direction so that the wing tip surface 6D having a thick front edge 6B and a thin point toward the trailing edge end 6c can be seen as a front horizontal length. The trailing edge 6C from the base portion 6A to the wing tip gradually inclines in the rearward rotation direction and sharply bends as it approaches the wing tip surface 6D , so that the front edge end 6E of the wing tip surface 6D rotates. The trailing edge end 6C of the blade tip surface 6D is formed to be outside the locus V, and the rotating rear surface 6F from the base portion 6A to the blade tip surface 6D is visible from the front. A horizontal axis wind turbine, characterized in that the rotation locus of the trailing edge end 6c in 6D is formed so as to overlap the column axis core line U of the column 2. The rotation locus V of the leading edge end 6E on the blade tip surface 6D of the lift type blade 6 is formed so as to be located in front of the rotation locus X of the front end surface of the hub 5A of the horizontal axis rotor 5. The lift type blade 6 is formed so that the rotation locus R of the trailing edge end 6c on the blade tip surface 6D of No. 6 overlaps with the rotation locus of the front and rear centers of the hub 5A of the horizontal axis rotor 5. The horizontal axis wind turbine according to claim 1. A plurality of lift type blades 6 are fixed in the radial direction at regular intervals on the peripheral surface of the hub 5A in which the front and rear ends of the rotation shafts 5B and 5C of the hub 5A of the horizontal shaft rotor 5 are projected back and forth. The base end surface of the base portion 6A of each lift type blade 6 has a shape in which the front portion is thick and gradually becomes thinner toward the rear end, and the front and rear portions thereof are fixed to the hub peripheral surface so as to be along the axis facing the front and rear of the hub 5A. A state in which the thickness center of the leading edge 6B of the base portion 6A of the lift type blade 6 is aligned with the blade center line S passing through the axis of the hub 5A in a front view with the wing tip of the lift type blade 6 facing upward. Then, the rotating front surface 6G facing the rotating direction of the leading edge 6B is formed parallel to the blade center line S, and is greatly bent in the rearward rotation direction from the middle of the length of the lift type blade to the blade tip. The wing tip surface 6D of the lift type blade 6 is formed substantially horizontally toward the front, and the wing tip surface 6D has a thick leading edge 6B and a pointed tip toward the rear end 6C. The direction of rotation from the base portion 6A of the lift type blade 6 to the wing tip surface 6D so that the trailing edge end 6c on the wing tip surface 6D is outside the rotation locus of the leading edge end 6E on the surface 6D. A horizontal axis rotor characterized in that the rotating rear surface 6F, which is behind the surface, is visible from the front. The horizontal axis rotor is supported by the rotation axis of the hub in the front-rear direction between the front end portion and the rear end portion of the wind turbine housing which is long in the front-rear direction, and the front-rear direction protrudes from the center of the hub in the front-rear direction. The tip of the rotating shaft of the above is concentrically connected to the tip of the rotating shaft facing the front and rear of the front and rear generators installed in the front end and the rear end of the wind turbine housing via a connector. The horizontal axis rotor according to claim 3. A blade center line S passing through the center of the thickness of the base 6A of the lift-type blade 6 in a front view in a state where the lift-type blade in the horizontal axis rotor is fixed to the hub 5A and the blade tip is vertically upward. Is passed through the axis of the hub 5A, the front edge 6B of the lift type blade 6 is directed to the front, and the rotating front surface 6G at the time of rotation is set in the rotation front in parallel with the blade center line S, and the trailing edge is set. 6C rises diagonally toward the wing tip, and from the middle of the wing length to the wing tip, it is greatly bent in the rearward direction of rotation, and the wing tip surface 6D appears horizontally and horizontally in front of the wing tip surface 6D. The trailing edge end 6c of the wing tip surface 6D is formed so as to be outside the rotation locus V of the front edge end 6E of the front edge 6B, and the rotating rear surface 6F from the base portion 6A to the wing tip surface 6D is formed. , The whole is formed so as to be seen from the front, and the plan view of the lift type blade 6 is a semicircular shape in which the rotating front surface 6G has a wide rear portion, and is pointed toward the trailing edge end 6c following the rotating front surface 6G. The rotor blade in 6D is characterized in that the rotation locus T of the front edge 6B projects forward in front of the rotation locus X of the front end surface 5E of the hub 5A.

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