阅读说明：本技术 在风能设备的转子的转子叶片的纵向部分之间的连接结构 (Connection between longitudinal sections of rotor blades of a rotor of a wind turbine ) 是由 J·林克 于 2020-10-16 设计创作，主要内容包括：本发明涉及在风能设备的转子的转子叶片的区段之间的连接结构,所述转子叶片横向于所述转子叶片的纵轴线是分开的,其中,转子叶片具有包括低压侧的壁壳和超压侧的壁壳的空心的翼型以及具有在壁壳之间的空腔中沿叶片纵向方向延伸的梁,所述梁与壁壳通过梁的面向壁壳的带部件相连接。根据本发明的连接结构的特征在于,转子叶片区段的梁的带部件在连接区域中加宽,同时形成相互对置的接合面,在接合面中的至少一个接合面中打开凹槽以用于容纳突出于相对置的接合面的连接元件,并且连接元件材料锁合地锚定在容纳凹槽中。(The invention relates to a connection between sections of a rotor blade of a rotor of a wind power plant, which rotor blade is divided transversely to the longitudinal axis of the rotor blade, wherein the rotor blade has a hollow profile with a wall shell on the low-pressure side and a wall shell on the high-pressure side, and a spar which extends in the longitudinal direction of the blade in a cavity between the wall shells, said spar being connected to the wall shells via a web part of the spar which faces the wall shells. The connection according to the invention is characterized in that the strip parts of the beams of the rotor blade sections are widened in the connection region while forming mutually opposing joint faces, in at least one of which a recess is opened for receiving a connecting element projecting from the opposing joint face, and in that the connecting element is anchored in a material-locking manner in the receiving recess.)

1. Connection between sections (2, 3) of a rotor blade (1) of a rotor of a wind power plant, which rotor blade is divided transversely to its longitudinal axis, wherein the rotor blade (1) has a hollow profile with a wall shell (5) on the low-pressure side and a wall shell (6) on the high-pressure side and a beam (7) which extends in the longitudinal direction of the blade in a cavity between the wall shells (5, 6) and is connected to the wall shells (5, 6) by a web (8, 9) of the beam (7) facing the wall shells (5, 6), characterized in that,

the strip parts (8, 9) of the spars (7) of the rotor blade sections (2, 3) are widened in the connecting region (4) and at the same time form mutually opposite joint surfaces (11, 12), a recess (13) is opened in at least one of the joint surfaces (11, 12) for receiving a connecting element (14) projecting beyond the opposite joint surface, and the connecting element (14) is anchored in the receiving recess (13) in a material-locking manner.

2. A connection arrangement according to claim 1, characterised in that the connecting element (14, 14a) is connected in one piece with the belt parts forming the mutually opposite joint faces or extends into receiving recesses (13) in two mutually opposite belt parts aligned in pairs with each other.

3. The connection according to claim 1 or 2, characterized in that the connection element (14) is a pin connection element having a preferably circular cross section and the receiving recess is a hole (13), in particular a blind hole, having a preferably circular cross section.

4. A connection arrangement according to any one of claims 1 to 3, characterised in that the connecting element (14a) has a flat cross section and the receiving groove is configured as a correspondingly narrow recess (13 a).

5. A connection arrangement according to any one of claims 2-4, characterised in that the connecting elements (14a) connected in one piece with the opposite engaging surfaces are formed by sections of a laminate layer protruding from the belt part in question.

6. The connection according to any one of claims 1 to 5, characterised in that the connecting element (14b) is also anchored in a form-locking manner in the receiving recess (13 b).

7. The connection according to any one of claims 1 to 6, characterised in that the receiving recess (13b) is undercut and the connecting element (14b) is deformable for introduction into the receiving recess.

8. A connection according to any of claims 1-7, characterized in that the end section with at least one of the widened strap members (8, 9) is completely prefabricated and glued to the rest of the beam (7).

9. Connection according to any of claims 1 to 8, characterized in that the strap members (8, 9) are widened in width and, if necessary, in thickness.

10. The connection according to any one of claims 1 to 9, characterised in that the belt members (8, 9) are widened by a laminate structure (26) which is connected with the ends, in particular tapered ends (25), of the rest of the belt members.

11. The connection according to one of claims 1 to 10, characterized in that the pin connection element (14) has a thickening (15) and in particular in that the contact surfaces (11, 12) which bear against one another in the connection region (4) are arranged in the region of the thickening (15), wherein the pin connection element (14) preferably comprises a conical widening (20) for forming the thickening (15).

12. The connection according to claim 11, characterized in that the thickening (15) is formed by at least one sleeve (19) mounted on a pin base (18) and fixed in particular by gluing.

13. Connection according to one of claims 1 to 12, characterized in that a channel (22) for pressing in adhesive, which opens towards the outside of the blade, and a channel (23) for controlling the filling of the gap between the pin connection element (14) and the bore wall, respectively, are let into the blind bore (13), preferably the control channels are formed by groove channels (23) introduced into the joint faces (11, 12).

14. The connection according to one of claims 1 to 13, characterized in that the pin connection element (14), the beam (7) comprising the widened portion and/or the wall shell (5, 6) consist of a fiber composite material, and in particular the beam (7) comprising the widened portion and, if appropriate, the wall shell have a fiber composite structure.

15. The connection according to one of claims 1 to 14, characterized in that the rotor blade segments (2, 3) each have a cover plate on the connection end, which cover plate protects the interior of the rotor blade segment and is fastened or releasably connected to the rotor blade segment.

Technical Field

The invention relates to a connection between sections of a blade of a rotor of a wind power plant, which blade is divided transversely to the longitudinal axis of the blade, wherein the rotor blade has a hollow profile with a wall shell on the low-pressure side and a wall shell on the high-pressure side, and a spar which extends in the longitudinal direction of the blade in a cavity between the wall shells and is connected to the wall shells by a web part of the spar which faces the wall shells.

Background

As rotor blades increase in length, the transverse separation yields advantages in terms of transport and production technology. Rotor blades consisting of rotor blade segments are known, for example, from EP 1761702B 1, US 9,506,452B2, EP 2740583B 1 and EP 2264310B 1.

Disclosure of Invention

The invention provides a new connection between sections of a rotor blade, of the type mentioned at the beginning, characterized in that the strip parts of the beams of the rotor blade sections are widened in the connection region, while mutually opposing joint faces are formed, in at least one of which joint faces a recess is opened for receiving a connecting element projecting beyond the opposing joint face, and in that the connecting element is anchored in a material-locking manner in the receiving recess.

The wall shell to a large extent contains filler material without load-bearing function, while the main determining stability of the rotor blade is the spar. According to the invention, the strip part of the spar, which widens in the connecting region, is contained in the connecting structure, so that the strip part serves as a support for a plurality of connecting elements by means of which the joining ends of the rotor blade sections are brought together. The rotor blade according to the invention can thus be loaded by pulling and pushing in the same way as a continuous rotor blade.

In one embodiment of the invention, the connecting element is connected in one piece to the belt part forming the further joint surface. Alternatively, the connecting element is a separate component, which extends into receiving recesses that are aligned in pairs with one another and open in the two joining faces.

In the present embodiment, the connecting element is designed in a targeted manner as a pin connecting element with a preferably circular cross section, which can be inserted into a bore forming the receiving recess, which bore has a corresponding cross section.

In a preferred embodiment, the connecting element is connected to one of the strap parts in one piece and has a flat cross section, and the connecting element engages in a receiving groove formed as a narrow recess.

The connecting element, which is connected in one piece with one of the belt parts, can be formed, for example, by a laminate layer, which projects beyond the belt part connected thereto.

In a further embodiment, the connecting element can be positively anchored in the receiving recess in addition to the cohesive anchoring, wherein the receiving recess is undercut and the connecting element can be deformed, for example, for insertion into the receiving recess.

In a further embodiment of the invention, at least one of the widened strip parts is formed by a prefabricated component which is completely adhesively bonded to the rest of the beam.

The thickness of the wall casing is reduced in a targeted manner in the region of the connection with the band element, so that, depending on the thickness of the wall casing, the band element locally assumes the function of the wall casing together in this region. In extreme cases, the thickness of the wall shell may approach zero in this region.

In the case of the widened band element, the holes mentioned above are each arranged in the vicinity of the wall shell in a line running parallel to the cross-sectional contour of the wall shell concerned.

The strip parts forming the support surfaces for the wall shells can be widened in width and/or thickness, wherein the holes are arranged, for example, not only in one but also in a plurality of rows parallel to the outer contour of the wall shell in question.

In one embodiment, the strap part of the beam is widened by a laminate structure which is fastened to the end of the rest of the strap part, preferably by a chamferAnd the tapered ends are connected. The laminate structure forming the widening is then reverse-bevel-fixed. In the case of a reverse bevel fixing again, the thickness of the end region of the widened portion can be reduced by a small amount towards the engagement surface.

In a targeted manner, the beam has a double T-profile and/or a frame profile. The strap members are then formed by the T-legs of the double T-profile or the mutually opposite legs of the frame-profile. In the connecting region, the widened strip part parallel to the wall shell can be supported by a connecting element opposite the rest of the beam, which connecting element is subjected to an additional thrust.

The mutually opposite joint surfaces can lie against one another and can optionally be adhesively bonded to one another with the inner space of the rotor blade sealed. However, a small spacing is preferably formed between the joining surfaces, so that the strap parts which widen in the connecting position and in particular the ends of the wall shells do not interfere with one another. The gap at the connection point can be closed by a thin cover plate surrounding the rotor blade.

In a further embodiment of the invention, the pin connection element has a thickened portion, in particular in the region of which the mutually opposite contact surfaces are arranged in the connection region. The thickened portion serves to increase the pulling and pushing stability with a low mass of the pin connection element. The thickened portions of the pin connection element are preferably each formed in a conical shape at the end, while avoiding a step shoulder.

The thickening can be formed by at least one sleeve which is attached to the pin base and is fastened in particular by gluing. The pin base and sleeve materials may be used as a finished product. The costs for producing such a pin connection element are correspondingly low.

In a further embodiment, a channel for pressing in the adhesive, which opens toward the inside or the outside of the blade, and a channel for controlling the filling of the gap between the pin connection element and the bore wall each open into the blind bore. Preferably, the control channel is a groove introduced into the engagement face. Alternatively, the adhesive quantity sufficient for the adhesive bonding can be filled quantitatively into the receiving recess which is open in the joining surface.

The spacer for centering the pin element in the bore can project radially beyond the pin connection element.

The connecting elements and receiving recesses may differ in shape, size and material within the connecting structure.

The connecting element, the reinforcing strip including the widening and/or the wall casing preferably consists of a fiber composite material. The widened belt part and, if appropriate, the wall shell are in particular accordingly a fiber composite structure.

The rotor blade section preferably relates to a section having a free end of the rotor blade and a section having a blade root of the rotor blade. However, at least one of the segments can also be connected at both ends to another rotor blade segment.

In a further embodiment, the rotor blade segments may each have a cover plate on the connection end, which protects the interior of the rotor blade segment.

Drawings

The invention will be further elucidated below on the basis of embodiments and figures associated with these embodiments. In the figure:

FIG. 1 partially shows a rotor blade consisting of rotor blade segments connected according to the invention;

FIG. 2 shows a connecting end of the rotor blade segment shown in FIG. 1 in a top view;

FIG. 3 shows a cross-sectional view of a sectional plane I-I of the rotor blade according to FIG. 1;

FIG. 4 shows in partial detail an embodiment of a connection according to the invention by means of a pin connection element;

FIG. 5 illustrates a pin connection element for use in the connection of FIG. 4;

fig. 6 and 7 show details of another embodiment of a connection according to the invention;

FIGS. 8 and 9 show an embodiment of a widened strip part according to the invention of a rotor blade segment in different views; and

fig. 10 to 12 show further embodiments of the connection according to the invention.

Detailed Description

The rotor blade 1 of the rotor of the wind power installation, which is partially shown in fig. 1, is divided laterally (the remainder of the wind power installation is not shown) and has in this example two rotor blade sections 2 and 3, of which one comprises the blade root and the other comprises the free blade tip (the blade root and tip are not visible). The connection region between the rotor blade segments 2, 3 is formed at 4.

The rotor blade segments 2, 3 have a hollow airfoil, which is shown in a cross-sectional view in fig. 3 and comprises a wall shell 5 on the low-pressure side and a wall shell 6 on the overpressure side. Fig. 1 shows the respective low-pressure side in a plan view.

Between the wall shells 5, 6, beams 7 extend across the cavity of the airfoil and in the longitudinal direction of the blade. The beam 7, which is shown in cross section in fig. 3, has a double T-profile comprising strip parts 8, 9 parallel to the wall shells 5, 6. The band parts 8, 9 are each inserted into a recess in the wall shells 5, 6 and are bonded to the wall shells 5, 6 over their entire surface. In this example, the vertical legs of the double T-profile form two slats 10.

In the connection region 4, the band parts 8, 9 widen toward the connection end of the rotor blade segment 2, 3 and are optionally locally thickened. The widened band parts 8, 9 connected to the wall shells 5, 6 form, at the respective connection ends, engagement faces 11 and 12, respectively.

As can be seen from fig. 2, holes 13 are opened in the joining faces 11, 12 of the rotor blade segments 2, 3, which faces are mirror images of each other in the connection, which holes 13 are arranged according to a line extending along the contour of the wall shells 5, 6. In the connection position between the rotor blade segments 2, 3, the respective bore 13 of the rotor blade segment 2 is axially aligned opposite the respective bore 13 of the rotor blade segment 3 with respect to the respective rotor blade segment.

In the holes 13 aligned with one another, in each case one pin connection element 14 is inserted, in the example shown, each pin connection element being inserted, for example, in each case by half its length. The pin connection element 14 is secured in the bore 13 by material locking.

In contrast to fig. 2, in addition to the preferably straight-running web 10 of the beam 7 entering the connecting region 4, an additional thrust-bearing connecting structure can be created between the widened belt parts 8, 9, as is shown in fig. 2 by dashed lines.

In the example described, both the pin connection element 14 and all the illustrated components of the rotor blade sections 2, 3 are preferably composed of fiber composite material (including carbon fiber composite material), in particular the spar 7 with the widening is formed as a fiber composite structure.

The pin connection element 14 shown schematically in fig. 1 can have a thickening according to fig. 4 and 5. The thickening 15, which is arranged in this example in the longitudinal middle of the pin connection element 14, is in this example arranged symmetrically with respect to the joining point between the interconnected rotor blade segments 2, 3. According to fig. 4, the pin connection elements 14 are fixed in the bores 13 arranged opposite one another in mirror image fashion by means of a hardened adhesive layer 16. In this example, an adhesive layer 17 is also formed between the joining surfaces 11, 12, in which the bores 13, which are arranged opposite one another in a mirror image, for receiving the pin connection elements 14 are open.

In this example, the thickened portion 15 of the pin connection element 14 shown in fig. 4 is formed by a sleeve 19 which is pushed onto the pin base 18 and is fixed by adhesive bonding. The sleeves 19 each have a conical taper 20 at their ends. The cross-section of the pinning element 14 is a continuous circle.

Advantageously, the hole 13 widened according to the thickening 15 can be produced in a single working operation by means of a correspondingly shaped drilling tool.

According to fig. 6, the channel 22 leading to the outside of the rotor blade segment 2, 3 can open into the bore 13 accommodating the pin connection element 14, through which channel the adhesive can be pressed into the gap between the pin connection element 14 and the wall of the bore 13. The passage 22 opens specifically into the closed end of the bore 13. At the open end, at least one control channel, which opens out to the outside of the rotor blade segment 2 or 3, can open out into the bore 13. In a targeted manner, a groove 23 leading into the joining surface 11 or 12 is formed as the control channel. It goes without saying that the channel 22 or the groove 23 can also open towards the inside of the rotor blade.

According to fig. 7, four such grooves 23 can, for example, open into the bore 13 at positions distributed over the circumference of the bore 13. The adhesive 16 flowing out of the groove channel 23 shows: the adhesive gap between the pin connection element 14 and the bore wall is completely filled with adhesive.

On the pin connection element 14, for example, spacers can be mounted which project radially from the support ring and which center the pin connection element 14 within the bore 13 and bring about a sufficient gap thickness all around for receiving the adhesive.

Fig. 8 and 9 show an embodiment of a widened region 21 of the belt part 8 or 9. In the widened region 21, the region of the remaining part of the strap part with a constant cross-sectional area transitions into an end section 25 with a reduced thickness. The reduction in thickness is achieved by a gradual reduction in the number of laminate layers (so-called ramp fixing).

The beveled end section 25 is connected to a counter-beveled laminate structure 26, by means of which the belt part 8 or 9 is enlarged both in thickness and in width up to an end region 27 with the joining surface 11 or 12. Beside the end sections 25 between the layers of the laminate structure 26 there are space-occupying fillers 29, for example made of foam or balsa wood.

The end region 27 also has a beveled fixing, as does the end section 25, i.e. its thickness decreases slightly towards the joint face 11 or 12.

In the example shown, the width of the belt member 8 or 9 increases from 0.7 m to 1 m, while the thickness increases from 23 mm to 100 mm.

The widened zone 21 can also be completely prefabricated and glued as one piece with the beam.

Reference is now made to fig. 10 to 12, in which identical or functionally identical parts are denoted by the same reference numerals as in the preceding figures and the associated reference numerals are given the letter a or b.

The exemplary embodiment shown in fig. 10 and 11 uses a tongue-and-groove connecting element 14a instead of the pin connecting element 14, which is connected in one piece with the widened band parts 8a and 9a of the beam 7 a.

As can be seen from fig. 11, the tongue-and-groove connecting element 14a is of flat design in cross section and engages in a slot-shaped receiving recess 13a in a correspondingly widened strip part of the web 7 a' of the rotor blade section 2 a. The connecting element 14a is anchored in the receiving recess 13a by means of an adhesive introduced and hardened beforehand.

The tenon-like, in cross-sectional view, flat connecting element 14a consists of a laminate layer section which projects from the widened belt part itself formed by the laminate layer. The slit-shaped receiving groove 13a is formed, for example, by a core which is removed after the lamination of the relevant belt member.

In the exemplary embodiment shown in detail in fig. 12, the slot-shaped receiving recess 13b is undercut and, for insertion into it, a deformable tongue-and-groove connecting element 14b engages in it. The deformability of the connecting element 14b is brought about by a wedge-shaped cutout 30 which has a widening at the closed end. The cutouts 30 form pressable legs which diverge again after the introduction of the connecting element 14b into the receiving recess 13 b. As can be seen in fig. 12, the wedge-shaped cut-out is filled with hardened adhesive 16 b.