JPS61175273A - Rotor supporting construction of propeller type wind mill - Google Patents

Abstract

PURPOSE:To secure wide bearing area for supporting a rotor and to improve rigidity by providing a fork with two legs on end portion of a horizontal rotary shaft to be mounted on the top of a strut and mounting the fork so as to clasp the hub of the rotor. CONSTITUTION:A rotary shaft 4 extending in the lateral direction to a double split construction nacelle 3 rotatably mounted around a strut, is supported rotatably on the top of struct provided vertically, and a fork 9 with two legs is mounted on the front end of the rotary shaft 4. While, a hub 6 constructing a central part of a rotor 5 is formed in a rough cross shape and a blade 7 is supported on a blade supporting part 6a opposed to the hub 6. A bearing unit 19 is fixed to the side face of the hub 6 on the side opposed to that facing the rotary shaft 4 slantly to support a pivot axis 22. And the fork 9 is mounted so as to clasp hub 6 and ends 9a are clamped to both ends of the pivot axis 22 by bolts 25 to support the rotor 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a rotor support structure for a propeller-type wind turbine used in a wind power generator or the like.

[Conventional wave j nete]

BACKGROUND ART As a wind turbine for driving a generator or the like, there is a propeller-type wind turbine in which a rotating shaft is horizontally supported at the upper end of a support column, and a rotor is attached to the end of the rotating shaft.

In such wind turbines, the rotor is sometimes subjected to impact force due to gusts of wind, so it is desirable to have a rotor support structure that allows the gust of wind to escape from the rotor and alleviate the impact force. For this reason, in the above propeller type wind turbine, a bifurcated fork is provided at the end of the horizontal rotating shaft as a rotor support structure to release gusts of wind.The bifurcated fork embraces the rotor hub, and the fork end There is a structure that extends to the opposite side and supports a pivot shaft installed obliquely on the opposite side of the rotor hub. According to this structure,
When the rotor receives a gust of wind, it swings diagonally, allowing the gust to escape and reducing the impact force.

However, in order to provide such a swingable support structure with high rigidity and stability, the bearing area must be considerably increased.

However, if the thickness of the support part of the fork end is increased in order to increase the bearing area, the weight of the rotor increases, which has a negative effect on improving the performance of the wind turbine.

[Purpose of the invention]

An object of the present invention is to provide a propeller-type wind turbine that can increase the bearing area without increasing the weight such as increasing the thickness of the fork end, thereby providing a highly rigid and stable support structure. An object of the present invention is to provide a rotor support structure.

[Structure of the invention]

To achieve the above object, the present invention provides a rotation shaft extending in the horizontal direction at the upper part of a support column that is erected upright, and is rotatable around the support support, and a bifurcated fork is provided at the end of the rotation shaft.
This bifurcated fork allows a pair of plays 1. ′ are arranged opposite to each other, the fork ends are extended to the opposite side of the hub, and the fork ends are fixed to both ends of a pivot shaft provided on the opposite side of the hub,
This pivot shaft is rotatably supported by a bearing portion diagonally intersecting a direction perpendicular to the longitudinal direction of the pair of blades.

〔Example〕

Hereinafter, the present invention will be explained with reference to embodiments shown in the drawings.

The propeller type wind turbine shown in Fig. 5 is a downwind type in which the rotor is placed on the leeward side of the rotating shaft. In this windmill, ■ is a support, and this support 1 is vertically erected by a plurality of tension wires 2. A nacelle 3 is provided at the upper end of the column 1 and is rotatably supported around the column 1. This nacelle 3 has a support arm 3a extending laterally, and a rotary shaft 4 is pivotally supported on the support arm 3a. A rotor 5 is attached to the end of the rotating shaft 4 by a structure that will be described in detail later.
is supported. The rotor 5 has a pair of blades 7.7 disposed on a hub 6 facing each other, and is further inclined to the leeward side at a coning angle α with respect to a plane F perpendicular to the rotation axis 4.

The rotor 5 moves to the leeward side while rotating the nacelle 3 around the support column in response to the wind in the direction of the arrow W, and rotates the rotating shaft 4 by the rotation of the rotor 5 itself. Rotating axis 4
The rotation is transmitted to a power transmission shaft 8 passing through the support column 1 via a bevel gear (not shown), and the transmission shaft 8 drives a generator (not shown) provided at the bottom of the support support 1.

1 to 4 show details of the rotor support portion of the propeller type wind turbine.

A steel bifurcated fork 9 is fixed to the front end of the rotating shaft 4,
A transmission gear 10 is fixed to the rear end. This rotating shaft 4
The nacelle 3 supporting the is assembled from an outer shell divided into upper and lower halves. On the other hand, a hub 6 that constitutes the center of the rotor 5
It is formed in the shape of a cross and has blade support parts 5a, 5a for supporting the blade 7.7, and control storage parts 6b, 6b for storing the blade angle control mechanism 11. This hub 6 is made of lightweight aluminum and is constructed by dividing the blade support portions 5a and 6a into left and right halves.

The blade support portions 6a, 6a of the hub 6 are connected to the support shaft 12.
．． 12 is rotatably supported, and a blade 7.7 made of fiber reinforced resin is fixed to flanges 12a, 12a on the outer end side of this support shaft 12.12. Also, the support shaft 12.12
A lever 12b extending to the left and right sides is provided at the inner end of the
.

12b is secured by bolts 16.16.

On the other hand, the control storage parts 6b, 6b have a fixed magnet 13 on the outer end side.
．． 13, and a fixed magnet 13.13 on the inner end side.
The movable magnets 14 and 14 are slidably housed in a relationship that attracts each other, and a spring 15 having an elastic force greater than the mutual attraction force between the two magnets 13 and 14 is provided between the fixed magnet 13 and the movable magnet 14. It is set up. The movable magnets 14 in each control storage section 6b are configured to slide in the longitudinal direction while being balanced with the tension of the spring 15 due to centrifugal force when the rotor 5 rotates.

One end side of two ronds 18.18 is engaged with this movable magnet 14 via a pin 17, and the other end side of the ronds 18.18 is connected to a lever 12b at the inner end of the support shaft 12 on one side.
and the other lever 12b at the inner end of the support shaft 12 on the other side.
is engaged with. Due to this connection by the iron 18, when the movable magnet 14 moves due to centrifugal force as described above, the support shaft 12 is rotated. The rotation of the support shaft 12 causes a small change in the angle of the blade 7 with respect to the wind direction W when the centrifugal force is large, that is, when the rotor 5 rotates quickly, and when the centrifugal force is small, that is, when the rotor 5 rotates quickly.
When the rotation of the rotor 5 is slow, the angle of the blade 7 with respect to the wind direction W is greatly changed, and the rotor 5 is controlled so as to always have a predetermined constant rotation speed. In addition, when excessive wind power is applied, the movable magnet 14 becomes attracted to the fixed magnet 15,
The blade 7 is made to maintain a minimum angle with respect to the wind direction W.

A bearing portion 19 is fixed to the side surface of the hub 6 opposite to the side facing the rotating shaft 4 via a flange 20 with bolts 21 . Oil-impregnated metals 23° 23 are press-fitted into both internal ends of this bearing portion 19.
．． A pivot shaft 22 is rotatably supported via 23. O-rings 24 are attached to both ends of this pivot shaft 22.
24 is fitted to prevent rainwater from entering. 0
The position of the ring 24 is set so that the distance a from the end surface of the bearing portion 19 is smaller than the distance a from the O-ring 24 to the outer end of the oil-impregnated metal 23. By setting the distances a and b in this manner, it is possible to attach the O-rings 24, 24 to both ends of the pivot shaft 22.

The bearing portion 19 is located slightly upwind from the center of gravity of the rotor 5. and the pivot axis 22 is perpendicular to the direction of the pair of opposed blades 7.7,
They are pivoted diagonally so that they intersect at an angle Δ3 (the first
(See Figure 4). Both ends of the pivot shaft 22, which is obliquely supported at an angle Δ3, are attached to the ends 9a, 9a of the bifurcated fork 9 at the front end of the rotating shaft 4 with bolts 25, 25.
Fixed by For this fixation, the bifurcated fork 9 diagonally sandwiches between the blade support section 6a and the control storage section 6b of the rotor hub 6, and extends the fork ends 9a, 9a so as to embrace it forward. There is.

Furthermore, the fork 9 has a control housing portion 6b corresponding to the portion that embraces the hub 6.

A bracket 26.26 is attached to the part corresponding to the outer surface of 6b, and a cushioning material 27.27 is attached to this bracket 26.26.
is installed. The cushioning material 27゜27 is made of highly weather-resistant cushioning rubber and abrasion-resistant fluororesin coated on its upper surface (
For example, formed from polytetrafluoroethylene),
The fluororesin surface faces the outer surface of the hub 6, that is, the outer surfaces of the control storage parts 6b, 6b, with a small gap therebetween.

As described above, the rotor 5 is supported obliquely at an angle Δ3 with respect to the fork 9 at the end of the rotating shaft 4 by the pivot shaft 22.
Since the rotor 5 is supported through the pivot shaft 22, the rotor 5 can freely swing diagonally around the pivot shaft 22 as shown by arrow A in FIG. Therefore, when a gust of wind blows on the blades 7, the blades 7 swing diagonally around the pivot shaft 22 to release the gust of wind and rotate the rotor 5.
Alleviates the impact force against.

Further, since the fork 9 is provided with a buffer material 27 corresponding to the outer surface of the hub 6, it prevents wear due to contact with the fork 9 when the rotor 5 swings, and also prevents the impact caused by gusts of wind. Alleviates force and stabilizes rotor rotation.

In addition, the setting of this angle Δ3, together with the fact that the support position of the pivot shaft 22 is located slightly forward of the center of gravity of the rotor 5, increases the directional stability of the rotor 5 and increases the efficiency of wind power utilization. can be improved.

The flange 20 for fixing the bearing part 19 has a pair of bolt holes 20a and 20 on both sides, respectively.
A is provided, but bolt holes 2 located on both sides
The pinch between 0a and 20a is set to a different distance from the pinch between the paired bolt holes 20a and 20a on the same side. By using different pinches in this manner, it is possible to prevent mistakes from occurring when assembling the bearing portion 19 at the angle Δ3.

According to the wind turbine rotor support structure described above, the pivot shaft 22 is fixed to the fork 9 at the end of the rotating shaft 4, and the pivot shaft 22 is attached to the bearing portion 19 attached to the rotor hub 6.
Since the rotor 5 is rotatable, the bearing surface for supporting the rotor 5 is located not between the end 9a of the fork 9 and the end of the pivot shaft 22, but between the main body surface of the pivot shaft 22 and the bearing 19. to form between. Therefore, the bearing area for supporting the rotor can be made thicker, thereby increasing the rotor 5
Even if the fork end portion 9a is supported in a swingable manner, it is possible to provide stable support with high rigidity without increasing the thickness of the fork end portion 9a.

In addition, in the above-mentioned embodiment, the case of a downwind type propeller wind turbine in which the rotor is mounted on the leeward side with respect to the rotating shaft was explained, but the present invention is applicable to an upwind type propeller wind turbine in which the rotor is mounted on the windward side. It is also applicable.

〔Effect of the invention〕

As described above, the present invention provides a rotatable shaft extending in the horizontal direction at the upper part of the vertically erected pillar, rotatably provided at the mouth of the pillar, and a bifurcated fork provided at the end of the rotating shaft. This bifurcated fork embraces the hub of the rotor, which has a pair of opposing blades, and extends the fork end to the opposite side of the hub, and the fork end is attached to a pivot provided on the opposite side of the hub. The pivot shaft was fixed to both ends of the shaft, and the pivot shaft was rotatably supported by bearings that crossed diagonally in a direction perpendicular to the longitudinal direction of the pair of blades. A large bearing area for supporting the rotor can be provided between the rotor and the rotor.

Therefore, it is possible to obtain a highly rigid and stable support structure without increasing the weight due to an increase in the wall thickness of the fork end.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of the main parts of a wind turbine equipped with the rotor support structure of the present invention, and Fig. 2 shows the rotor hub of the wind turbine as viewed from the ■-n arrow in Fig. FIG. 3 is a partially cutaway front view of the rotor hub, FIG. 4 is a front view of the portion corresponding to FIG. 2, and FIG. 5 is a partially cutaway side view of the rotor hub. FIG. ■... Strut, 3... Nacelle, 4... Rotating shaft,
5... Rotor, 6... Hub, 6a... Blade support section, 6b... Control storage section, 7... Blade, 9... Fork, 19... Bearing section,
22... Pipono 1~shaft, 23... Oil-impregnated metal.

Claims (1)

[Claims] A rotating shaft extending in the horizontal direction is provided on the upper part of the vertically erected pillars so as to be rotatable around the pillar, and a bifurcated fork is provided at the end of the rotating shaft, and the bifurcated fork rotates a pair of blades. Embrace the hub of the rotor formed by facing each other, extend the fork end to the opposite side of the hub, and
The ends of the fork are fixed to both ends of a pivot shaft provided on the opposite side of the hub, and the pivot shaft is rotatably mounted on a bearing section diagonally intersecting in a direction perpendicular to the longitudinal direction of the pair of blades. A rotor support structure for a propeller-type wind turbine characterized by supporting the rotor.