Windwheel blade

FIELD: power industry.

SUBSTANCE: windwheel blade includes tubular spar and sections into which a blade is divided along the span. Spar is made so that it is lowered from the blade outline. Sections include covers and ribs. Sections include connection profiles arranged between covers and flanges of spar and connection parts installed on webs of ribs, which are attached to the above profiles. Connection parts are attached by means of fasteners to spar webs. Adjacent sections are connected by means of connection straps to each other with possibility of mutual movement. Separation of blade into sections is made so that at least two ribs in the most loaded sections are connected by means of connection and fastening parts to spar. Connection profiles in them are disconnected from spar flanges. As for other ribs, connection parts and connection profiles are made and mounted so that a gap is formed between them and spar along webs and flanges by the value of spar deflections. Protective patches are installed on the spar in the zone of connection parts and connection profiles.

EFFECT: increasing the blade service life.

1 cl, 9 dwg

 

The present invention relates to wind energy, namely the designs of the blades of wind turbines (wind turbines).

A known design of wind turbine blades, adopted as a prototype (RF patent for the invention №1828000)containing steel tubular spar, which is a means of connecting and mounting parts mounted nose and tail compartments, comprising forming the aerodynamic contour of the blade sheeting with ribs. The spar is made with rectilinear generatrices and the understatement from the contour of the blade to a height of fittings made in the form of profiles, on the one hand supported through the glue joint on the upper and lower shear webs and covering them in the clamp fits over the clamping strips attached to the walls of the spar fasteners placed at a distance of not more than one-half the height from the neutral axis of the spar to its outer contour, and on the other hand, using fasteners connected to the skins and ribs compartments. Plating compartments blade dismembered it scale into sections, interacting with each other through the connecting parts, providing the relative movement between the sections, with the possibility of transmission of torque. Section of the casing, together with located underneath the ribs, having in its composition o f the data between the paneling and shelves spar connecting profiles and bonded with them, installed on the walls of the ribs of the fitting, articulated fasteners with the walls of the spar, form compartments blades located along its span. Movably mating fasteners compartments made in the form of pads to put on them in the adjoining hard surface with a low coefficient of friction, mainly VAP-3.

The characteristics of the prototype, coinciding with the essential features of the proposed solution are as follows - blade propeller, containing tubular spar, made the understatement from the contour of the blade compartments that swing blade dismembered, including skin, ribs, having in its composition placed between the skins and shelves spar connecting profiles and bonded with them mounted on the walls of the ribs of the fitting, articulated fasteners with the walls of the spar, and the connecting pads, which are articulated between adjacent compartments, with the possibility of relative displacement.

When such joint compartments of the blade with a spar and ribs, is secured in a compartment on the spar more than two, with deformation of the side member through the connecting and mounting parts compartments happen "forced" deformation compartments, and therefore, in addition to "pure wind" and Centrale the major loads appears alternating loading of structures details of the cover and mating with fasteners places spar, reducing the life of the skins and spar, and therefore the resource of the blade. In addition, in the places of articulation of the connecting parts with the regiments of the spar when the bending deformation of the side member and the deformation of the connecting parts is possible fracture of adhesive joints due to uneven margin, which leads to displacement under load fittings and profiles on the surface of the spar and, consequently, to the disturbance of pavement, scuffing and corrosion of parts of the blade, which reduces the resource of the blade. The connecting pads through which interact neighboring compartments, bending the blades are deformed that when the mutual displacements of the compartments can lead to their destruction and mating with them the details of the compartments, the loss of sealing the joint between the compartments, reducing the aerodynamic efficiency of the blade and its resource.

The technical result, which directed the proposed device is to increase the working life of the blade by removing additional alternating loading of skins, parts, sections, fasteners and mating with them places spar caused by the Flexural deformation of the spar, preservation from damage to the surface of the spar, lining and sheathing the blade.

To achieve the technical result in the propeller blades, containing tubular spar, made the understatement from the contour of the blade compartments that swing blade dismembered, including skin, ribs, having in its composition placed between the skins and shelves spar connecting profiles and bonded with them mounted on the walls of the ribs of the fitting, articulated fasteners with the walls of the spar, and the connecting pads, which are articulated between adjacent compartments, with the possibility of relative displacement, the dismemberment of the blade into compartments designed in such a way that at least in the most loaded compartments, only two ribs by means of connectors and fasteners coupled to the spar, while the connection profiles in them divided with shelves longerons and ribs connecting part and the connecting profiles are made and assembled in such a way that between them and the spar on the walls and shelves gap formed on the deflection of the spar, and in the area of fasteners and connection profiles on the spar installed protective lining.

Distinctive features of the offered blade is that the dismemberment of the blade into compartments designed in such a way that at least in the most loaded compartments, only two ribs by means of the coupling and fixing the item is articulated to the spar in this connection profiles in them divided with shelves longerons and ribs connecting part and the connecting profiles are made and assembled in such a way that between them and the spar on the walls and shelves gap formed on the deflection of the spar, and in the area of fittings and profiles on the spar installed protective lining.

Due to the presence of these distinctive features in conjunction with the known (specified in the restrictive part of the formula), is achieved by the following technical result - significantly increases the service life of the blade and prevents the reduction of the aerodynamic efficiency of the blade during the working resource.

The proposed solution can be used in the construction of windwheels mostly powerful wind turbine (50 kW/h and more). Thus, the proposed solution meets the eligibility criterion "industrial applicability".

The invention is illustrated by drawings figure 1...9.

1 shows a view of the blades in the plan, figure 2...9 - details of the compartments and their articulation with each other and with the spar.

Presents lobe contains the primary power element - side member 1 made by understating from the contour of the blade, 2 compartments, which are composed of plating 3 (figure 2), two internal 4 (figure 1) and two outside the s 5 rib, consisting of nose and tail parts, connected by a connecting profile established between the casings 3 (2) shelves and the side member 1 and is made from steel diaphragms 6 and 7 (6), bonded installed on the walls of the ribs 4 and 5, the connecting parts 8 (2) and 9 (6), and aluminum profiles 10 (2) and 11 (6)connected with the casings 3 and respectively with the apertures 6 and 7. The connection piece 8 of the two inner ribs 4 is fixed to the wall side member 1 by means of fixing parts 12 (figure 2). On the walls and shelves of the side member 1 in the areas of installation of the diaphragms 6 and 7 are mounted on glue and compensative technological inaccuracies layer fiberglass 13 (4, 8, 9) protective pads 14. The gaps 15 between the compartments 2 are closed connecting pads 16 (7), which articulated between adjacent compartments 2, with the possibility of relative displacement. Pads 16 can be performed, for example, a flexible thin (0.2 mm) hardened steel and is attached to one of the adjacent ribs 5 (7) or made of elastic material (fabric, film - not shown). Steel diaphragm 6 is installed with a small gap 17 (figure 4) over the shelves of the side member 1, the connecting part 9 of the two outer ribs 5 and the diaphragm 7 are mounted in the compartments so that between them and the spar on the walls, and p is lcam formed gaps 18 (Fig) and 19 (Fig.9), equal to the deformation of the spar in these places under operational loads on the blade. Protective 14 (4, 8, 9) and 16 connecting pads are covered by the connecting parts 8, 9 and diaphragms 6, 7 hard coating 20 (figure 4, 7, 8, 9) with a low coefficient of friction. As a solid coating 20 can be used floor VAP-2 or WAP-3 (solid anti-friction coating on the basis of dvuhseriynogo molybdenum).

The described device operates as follows. Acting on the compartments of the blade aerodynamic loading and centrifugal force through the casing 3, the rib 4, the profiles 10, the diaphragm 6, the connecting 8 and 12 of the mounting part is transmitted to the side member 1, being transformed at the moment of the rotating wheel. Under the action of loads spar 1 is bent, the gap 15 and plates 16 allow adjacent compartments 2 to move freely relative to each other in scope, the gap 17 releases the shelf side member 1 from the emphasis of the apertures 6 in the Assembly of the blades and the deformation of the mating parts when working with blades under load, the gaps 18 and 19 free shelves and walls of the side member 1 from the emphasis of the diaphragm 7 and the connecting parts 9 bending of the spar from operational loads, and by the action of the vane random off-design loads of the diaphragm 7 and the connecting parts 9, choosing the gaps 18 and 19 communicate with spar 1 is via the protective pads 14 coated with the coating 20. When docked, at least in the most loaded compartments 2 propeller blades on the side member 1 only two ribs 4 through the aperture 6, the connecting 8 and 12 of the mounting part, and if there are gaps 15, 17, 18 and 19 between the members of the compartments 2 and spar 1 in other places compartments 2 are not involved in the bending of the spar 1 and only pass on the spar acting on them aerodynamic and centrifugal forces, which significantly reduces the tension in the casings 3, mating with them connecting 8, 9, and attachment 12 parts, eliminates the deformation of the side member 1 when the calculated modes of the blades and protective pads 14 mounted on the glue, without weakening the cross-section of the side member 1, protect it for possible non-nominal modes, which together significantly increases the service life of the blades of the propeller. Due to the unloading bays 2 from bending stresses prevents deformation of the casing 3 when the bending of the side member 1, which ensures the preservation of the aerodynamic efficiency of the blade during the working resource, and also got the opportunity to use flexible or resilient pads 16, which significantly reduces the wear of the connecting elements 2 compartments at their deformation and mutual movements, keeps the seal in the joints of compartments 2, thereby increasing the resource of the blades, its effectiveness. PR is maintained at the enterprise series of structural calculations blades, the method of finite elements", in the proposed design of the optimal number of blades is four ribs 4 and 5 in the most loaded compartments 2, of which are bonded to the spar 1 two internal ribs 4, also acceptable variant with five ribs 4 and 5, of which are bonded to the spar 1 must be rib 4 second from the edges of the sheathing 3 compartments 2, while the voltage coverings in comparison with the known design of the blade has decreased ~ 5 times, the tension in the connecting elements ~ 4 times, and in places of fastening of the connecting parts with the spar ~ 2.5 times.

Blade propeller, containing tubular spar, made the understatement from the contour of the blade compartments that swing blade dismembered, including skin, ribs, having in its composition placed between the skins and shelves spar connecting profiles and bonded with them installed on the walls of the ribs of the fitting, articulated fasteners with the walls of the spar, and the connecting pads, which are articulated between adjacent compartments, with the possibility of relative displacement, characterized in that the dismemberment of the blade into compartments designed in such a way that at least in the most loaded compartments, only two ribs by means of connectors and fasteners coupled to the side member, with the connecting section is Ofili them divided with shelves of the spar, while other ribs of the fitting and the connecting profiles are made and assembled in such a way that between them and the spar on the walls and shelves gap formed on the deflection of the spar, and in the area of fasteners and connection profiles on the spar installed protective pads.



 

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