CN2767695Y

CN2767695Y - Double pinnate variant blade dedicated for wind mill

Info

Publication number: CN2767695Y
Application number: CNU2005200018834U
Authority: CN
Inventors: 李军
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-02-03
Filing date: 2005-02-03
Publication date: 2006-03-29
Anticipated expiration: 2015-02-03

Abstract

The utility model relates to a double pinnate variant blade dedicated for a wind mill, which is formed by that a long tip blade and a flat, wide and short blade are obliquely combined; the thickness of the combining position is thick; a bending angle is formed by that the front edges of both sides are gradually reduced towards the surface of a leave basin of the back edges; the front edge of the long tip blade and the concave surface of the leave basin are communicated to the leave tip; the back edge of the long tip blade is moved upwards in a straight line with large inclined rate, and an acute angle is formed between the back edge and the front edge; the position close to the leave tip position is provided with an arc-shaped wind corner which is gradually changed into an arc shape and shrunk to the tip part; the edges on the both sides of wide short blade which are in an arc shape in a shrinking type close to the tip part are slidingly connected in an arc shape; the periphery edge is higher than the surface of the leave basin; the front edge is provided with a wind blocking strip; the front part of the wind blocking strip is slindingly connected with the arc surface of the leave basin, the back part and the back surface of the leaves; the wide short blade is positioned on the root part of blades and is positioned on the outer part of the one second position of the length of the wide short blade which is provided with a positioning plate, the central line of which passes through the gravity center of the blades and is linked with balance combining components. The blades are grandually changed into thin from the root part to the leave tip and from the front edge to the back edge.

Description

The double feather like variation blade of wind energy conversion system special use

Technical field

The utility model relates to a kind of blade of improved wind energy conversion system special use, specifically a kind of double feather like variation blade of wind energy conversion system special use.

Background technique

In the existing technology, the place that utilizes wind-force to carry out work done has a lot, mainly depends on blade and rotates under the wind-force effect, obtains multi-form transformation of energy.And the generating of wind energy conversion system is to take from wind-force to be converted into electric power again; Under particularly powering comparatively nervous situation, show important especially in country.The blade feature of power size, performance and its adapted of wind energy conversion system has much relations.But no matter existing wind energy conversion system is fixed pitch or feather structure, and its starting performance is relatively poor, and switching energy efficient is on the low side.Department of Intellectual Property of State Bureau disclosed a kind of " the double feather like blade of wind energy conversion system special use " is patent (ZL97116440.1), can utilize the wind-force high efficiency to convert the energy of generating to, and the blade rotary work trends towards static unbalance, almost is breeze start-up.But in use, when meeting with high wind, prominent wind, running shaft influence in its balanced combination part has appearred being limited by in blade work, this running shaft runs through mid blade and influenced by aerodynamic force, be that running shaft passes the blade center portion to pass in and out two holes, destroy the integrity of blade, run counter to air-flow aerodynamic effect rule; Add to and be to make axis rotation, and along with wind-engaging power effect simultaneously on its windward side radially, because radial dimension difference, circumferential rotation is stressed large and small inequality, the different frequency vibration just takes place in blade and running shaft, or shake appears breathing heavily in the blade point, therefore just is easy to generate running shaft or the blade problem that fractures that makes.

Summary of the invention

The purpose of this utility model is: the deficiency that overcomes existing " the double feather like blade of wind energy conversion system special use " patent, make stable plate and replace running shaft, and the double feather like blade profile made corresponding transformation, and a kind of double feather like variation blade of wind energy conversion system special use is provided.

Task of the present utility model is to realize like this; A kind of double feather like of wind energy conversion system special use variation blade comprises that blade is that blade by a sharp linear leaf and a wide weak point constitutes, and its two blade still links like plumage type oblique, and protruding the position with airfoil surface is benchmark, and both sides then be that formula is omited in the back; The wide profile of leaf is to be made of to antemarginal leaf pelvic surface of sacrum the front rim, and the leaf pelvic surface of sacrum is parabola shaped and the arc shaped surface of the slick and sly switching formation of ternary streamline surface, and the leaf pelvic surface of sacrum is the asymmetric concave arc surfaces in both sides along the wide centerline direction of leaf; It is characterized in that: in the blade 7 oblique junction of sharper linear leaf 4 and wider weak point, is benchmark with its place's airfoil surface front edge protruding the position, the front edge 1 of point linear leaf 4 and the interior front edge 9 of wide short blade 7, towards the rear edge 5 of sharp linear leaf 4 and interior rear edge 6 outsides of wide short blade 7, to the angle coupling angle that the leaf pelvic surface of sacrum is received little formation blade, the angle coupling angle α of front edge, antemarginal angle coupling angle β; That is: the angle between front edge 1, the interior front edge 9 is α=90 °～115 °; Angle is β=110 °～125 ° between rear edge 5 and the interior rear edge 6.And its front edge 1 and rear edge 5, interior front edge 9 and interior rear edge 6, by the little concave arc shape that becomes of the asymmetric receipts of two side direction center lines, be the leaf pelvic surface of sacrum of blade; The front edge 1 of point linear leaf 4 is with the sensible blade tip of lineal shape, and the concave arc surface of leaf pelvic surface of sacrum is straight unimpeded to blade tip; Its rear rim 5 with big slope linearly formula raise up, forward edge 1 is near in an acute angle, behind the wind-force angle 3 near blade tip place sudden contraction camber, the slow camber of gradual change converges to leaf tip, forward and backward edge the 1, the 5th, trackslipping with curved circular connects.Wide short blade 7 is slightly tiltedly horizontal to be in blade near interior root, and front edge 9 and interior rear edge 6 are to be the asymptotic leaf tip of camber line shape reducing-pitch thread in the both sides of wide short blade 7, and forward and backward edge the 9, the 6th in the leaf tip of wide short blade 7 is with the slick and sly switching of circular arc; And its circumferential edges is higher than the leaf pelvic surface of sacrum, and in the 1/2 place center line outside of wide short blade 7 along the leaf length direction, the stable plate 8 of ining succession behind front edge 9 positions, which is provided with the pin-and-hole and the screw hole that link with the balanced combination part in the wide short blade of stable plate 8 disengagings; Blade is installed by the stable plate 8 of its root and is connected the balanced combination part; Some torsion angle gradually therebetween, i.e. connection angle γ=0～26 °.The center line of stable plate 8 is by the center of gravity line of blade.Change different established angles, blade both can be turned clockwise, also can be rotated counterclockwise; Blade be from its root to blade tip, in the past, interior front edge 1,9 to the back, interior

rear edge

5,6 thickness attenuation gradually, thin and thick is than ε=1～15 times, and it is thicker at the thickness of two blade jointing place blades, from intersection point forward position, edge to the mid blade thin and thick than δ=1.5～60 times, according to the size of different capacity, the big or small thickness of its blade also not to the utmost together.On blade front edge 1, rely on leaf pelvic surface of sacrum one side, protrude a folding aerofoil bar 2, the oblique leaf pelvic surface of sacrum of its inboard face, and with the slick and sly switching of the concave arc surface of leaf pelvic surface of sacrum; The slick and sly switching of the arc shaped surface of its outer side surface and leaf back; The top is the slick and sly switching of innner and outer face; Folding aerofoil 2 is along the through leaf tip of the front edge 1 of sharp linear leaf 4, and wide short blade 7 partly on, be to follow interior front edge (9), with arc by stable plate 8 edge fit places, on the front edge 9 that disappears within it; Changing different established angles can make blade carry out clockwise or rotate counterclockwise.

The utility model advantage compared with prior art is: because blade is an overall structure form, its intensity increases, and does not occur vibrating dry sound when on probation, blade do not occur by the problem of fractureing.Because of set up folding aerofoil bar on front edge, the wind-force entrance angle is subjected under the centrifugal action through the leaf pelvic surface of sacrum, has strengthened the thrust to blade again; Under same wind-force action condition, play the wind-collecting acceleration effect after tested, generating capacity increases greatly.And made the wind-force angle, and reach the wind loss that has reduced the blade tip vortex flow, increased the wind power utilization rate on the wind-exposuring area.

Description of drawings

Fig. 1 is a front view of the present utility model.

Fig. 2 is the working position schematic representation of Fig. 1 blade.

Fig. 3 is that the K of Fig. 1 is to view.

Fig. 4 is the B-B cross section view of Fig. 1.

Fig. 5 is the A-A cross section view of Fig. 1.

Among the figure: 1. rear edge 7. wide short blades 8. are stabilized front edges in the plates 9. in 4. sharp linear leaf 5. rear edge 6. of front edge 2. folding aerofoil bars 3. wind-force angles

Embodiment

Below in conjunction with accompanying drawing the utility model is further described.

With reference to Fig. 1-5, a kind of double feather like variation blade of wind energy conversion system special use, this blade is by a sharper linear leaf, still link with a wider short blade like feather imagination oblique, and the bent angle of formation jointing place, constitute leading edge and protrude the benchmark position of jointing place, trailing edge indent jointing place, leaf pelvic surface of sacrum, leaf back are parabola shaped and the ternary streamline surface, constitute with its slick and sly switching to have given shape protruding, recessed joining.Front edge 1 and interior front edge 9 both sides, corresponding towards the rear edge 5 and interior rear edge 6 outsides, receive little formation leaf pelvic surface of sacrum to bent angle towards blade benchmark position, be front edge 1 and the angle coupling angle α of interior front edge 9=95 °, the angle coupling angle β of rear edge 5 and interior rear edge 6=105 °.Front edge 1 at blade leans on leaf pelvic surface of sacrum one side, be shaped on and protrude a folding aerofoil bar 2, it is to blade tip with straight line with sharp linear leaf front edge, and sharp linear leaf rear edge 5 raises up from angle coupling angle β beginning straight line and tiltedly points to front edge 1, after nearly blade tip place sudden contraction circular arc becomes wind-force angle 3, slope is decrescence slow to converge to blade tip with the circular arc limit, and with front edge 1 slick and sly switching, the concave arc surface in its leaf pelvic surface of sacrum is straight-through smooth to blade tip.The interior forward and backward

edge

9,6 of wide short blade 7 both sides is a camber line shape reducing-pitch thread, and at nearly leaf tip place, forward and backward edge trackslips with curved circular and connects, and its circumferential edges is higher than the leaf pelvic surface of sacrum.1/2 place of front edge 9 in wide short blade 7, the stable plate 8 of the outside of the wide center line of leaf, making and settlement disjunctor, its center line is by the blade center of gravity; Stable plate 8 is shaped on positioning hole and tapped hole at 1/2 place's external lateral portion of interior front edge 9, is beneficial to stable plate 8 and is connected connection angle γ=10 ° with the balanced combination part.Folding aerofoil bar 2 gradually disappears on front edge 9 edges of wide short blade behind stable plate 8.As 300 watts blade, long 70 centimetres of its single blade, about 28 centimetres of wide short blade, the gentle breeze starting when 2.5 grades of wind-force, can drive generated output power and reach 300 watts, does not lose problem and can not produce blade.

Claims

1, a kind of two plumage anomaly blades of wind energy conversion system special use comprise that blade is that blade by a sharp linear leaf and a wide weak point constitutes, and its two blade still links like plumage type oblique, and protruding the position with the airfoil surface front edge, to do the benchmark both sides are slightly formulas of back; The wide profile of leaf is to be made of the leaf pelvic surface of sacrum of front rim to the back rim, and the leaf pelvic surface of sacrum is parabola shaped and slick and sly leaf back arc, the leaf pelvic surface of sacrum arc shaped surface of transferring, constituting of ternary streamline surface, and the leaf pelvic surface of sacrum is the asymmetric concave arc surfaces in both sides along centerline direction; It is characterized in that:

A, in blade (7) the oblique junction of sharper linear leaf (4) and wider weak point, protruding position with its place's airfoil surface is benchmark; Front edge (1) and interior front edge (9) towards the rear edge (5) and interior rear edge (6) outside, are received the leaf pelvic surface of sacrum front edge angle coupling angle α of little one-tenth blade, rear edge angle coupling angle β in opposite directions;

The front edge (1) of B, sharp linear leaf (4) is with the sensible blade tip of lineal shape, its rear rim (5) with big slope linearly formula raise up, in an acute angle with front edge (1), behind wind-force angle (3) near blade tip place sudden contraction camber, gradually gradual camber converges to leaf tip, and forward and backward edge (1), (5) are to trackslip with curved circular to connect; The concave arc surface of leaf pelvic surface of sacrum is straight unimpeded to blade tip;

C, wide short blade (7) are slightly tiltedly horizontal to be in blade near interior root, front edge in the both sides of wide short blade (7) (9) and interior rear edge (6), be to be the asymptotic leaf tip of camber line shape reducing-pitch thread, forward and backward edge (9), (6) are with the slick and sly switching of circular arc in the leaf tip of wide short blade (7); And its circumferential edges is higher than the leaf pelvic surface of sacrum, in the 1/2 place center line outside of wide short blade (7) along the leaf length direction, the stable plate (8) of ining succession behind front edge (9) position, which is provided with pin-and-hole and screw hole with the binding of balanced combination part in stable plate (8) breaks away from wide short blade; Blade is installed by the stable plate (8) of its root and is connected the balanced combination part, some torsion angle gradually therebetween, connection angle γ=0～26 °;

D, blade are the thickness attenuation gradually from the root to the blade tip, from front edge (1), interior front edge (9) to rear edge (5), interior rear edge (6); The center line of stable plate (8) is by the center of gravity line of blade;

E, protrude a folding aerofoil bar (2) at blade front edge (1) by leaf pelvic surface of sacrum one side, the concave arc surface of the oblique leaf pelvic surface of sacrum of its inboard face and leaf pelvic surface of sacrum is slick and sly transfers; Its outer side surface and leaf back, the slick and sly switching of convex arc profile; The top is the slick and sly switching of innner and outer face; Folding aerofoil (2) is along the through leaf tip of the front edge (1) of sharp linear leaf (4), and on wide short blade (6) part, is that to follow interior front edge (9) be to arrive at the outer edge fit of stable plate (7) place gradually to disappear on the interior front edge (9) with arc.

2, according to claim 1 pair of plumage anomaly blade, it is characterized in that: the upper and lower end place, imaginary connecting part of the sharp linear leaf (4) of blade and wide short blade (6), be that front edge (1) is at the front edge angle coupling angle of protruding the position, also be the crooked angle of folding aerofoil bar (2) towards the leaf pelvic surface of sacrum, α=90 °～125 °, and bent angle β=110 of rear edge (5) °～125 °.