Blade root structure and wind power blade

Abstract

The utility model belongs to the technical field of wind power blades, and particularly relates to a blade root structure and a wind power blade, the blade root structure comprises outer-layer glass fiber reinforced plastic, inner-layer glass fiber reinforced plastic, a plurality of bolt sleeves, a plurality of wedge-shaped strips and a plurality of radial connecting pieces, the plurality of bolt sleeves and the plurality of wedge-shaped strips are pre-buried between the outer-layer glass fiber reinforced plastic and the inner-layer glass fiber reinforced plastic; fixing holes are formed in the side faces of the multiple bolt sleeves and / or the multiple wedge-shaped strips in the radial direction of the blade root, and the radial connecting pieces penetrate through the outer-layer glass fiber reinforced plastic and / or the inner-layer glass fiber reinforced plastic and are arranged in the corresponding fixing holes in a penetrating mode; and the outer-layer glass fiber reinforced plastic and the inner-layer glass fiber reinforced plastic are fixed with the plurality of bolt sleeves and / or the plurality of wedge-shaped strips in the radial direction of the blade root. The wind power blade can prevent interface layering failure among the bolt sleeve, the wedge-shaped strip, the outer-layer glass fiber reinforced plastic and the inner-layer glass fiber reinforced plastic, the problem that the bolt sleeve is pulled out and fails due to interface force is solved, the structural strength of the blade root is improved, and the service life of the wind power blade is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of wind power blade, concretely relates to a blade root structure and wind power blade. BACKGROUND

[0002] The wind power blade bears the complex loads such as aerodynamic force, gravity and centrifugal force in the operation process. Since the load acting on the wind power blade is transmitted to the hub through the blade root connecting structure, the reliability of the blade root connection is particularly important. The most common blade root connection mode is T-bolt connection, but as the blade length increases and the megawatt level of the wind turbine generator set increases, the blade load also increases, and the traditional T-bolt connection mode cannot meet the requirements of the blade ultimate strength and fatigue strength, therefore, most large-size blades currently use the connection mode of pre-buried bolt sleeve, which can better adapt to the load changes caused by the increase of the blade length. However, the blade using the pre-buried bolt sleeve connection mode is prone to interface delamination failure between the inner and outer glass steels and the pre-buried bolt sleeve and wedge-shaped strip, and is prone to the risk of failure of the pre-buried bolt sleeve being pulled out. SUMMARY

[0003] The technical problem to be solved by the utility model is to provide a blade root structure and wind power blade which, on the basis of the connection mode of pre-buried bolt sleeve, prevents the interface delamination failure between the bolt sleeve, wedge-shaped strip and the outer and inner glass steels, reduces the bolt sleeve pulling-out failure problem caused by the interface force in the actual operation stress process of the wind power blade, and prolongs the service life of the wind power blade.

[0004] The utility model provides a kind of blade root structure, including outer glass steel, inner glass steel, several bolt sleeves, several wedge-shaped strips and several radial connecting pieces, several bolt sleeves and several wedge-shaped strips are pre-buried between outer glass steel and inner glass steel, and are staggered along the circumferential direction of blade root between outer glass steel and inner glass steel, the side of several bolt sleeves and / or several wedge-shaped strips is provided with fixed hole along the radial direction of blade root, each radial connecting piece passes through outer glass steel and / or inner glass steel and is arranged in corresponding fixed hole, so that outer glass steel and inner glass steel are fixed with several bolt sleeves and / or several wedge-shaped strips in the radial direction of blade root.

[0005] Further, the fixed hole of the several bolt sleeves and / or the several wedge-shaped strips is radially through, the radial connecting piece is a double-end screw rod, the double-end screw rod is arranged in the outer glass steel, the fixed hole and the inner glass steel at the same time, and the both ends of the double-end screw rod correspond to protrude from the surface of the outer glass steel and the inner glass steel and are locked and fixed by nut.

[0006] Further, the fixing holes of the bolt sleeves and / or the wedge-shaped strips are radially through holes, the radial connecting members are first bolts, the first bolts pass through the outer layer glass fiber reinforced plastic, the fixing holes and the inner layer glass fiber reinforced plastic, and the ends of the first bolts protrude from the surfaces of the outer layer glass fiber reinforced plastic or the inner layer glass fiber reinforced plastic and are locked and fixed by nuts.

[0007] Further, the fixing holes of the bolt sleeves and / or the wedge-shaped strips are threaded holes, and the fixing holes on a single bolt sleeve or a single wedge-shaped strip are symmetrically provided with two, the radial connecting members are second bolts, the second bolts pass through the outer layer glass fiber reinforced plastic and the inner layer glass fiber reinforced plastic, and the ends of the second bolts are threadedly connected with the corresponding fixing holes.

[0008] Further, the second bolts are stepped bolts.

[0009] Further, when the side surfaces of the bolt sleeves are provided with the fixing holes, the fixing holes are located on the side surfaces of one end of the bolt sleeves away from the blade root end surface.

[0010] Further, the fixing holes are arranged on the side surfaces of one end of the bolt sleeves and / or the wedge-shaped strips close to the blade root end surface.

[0011] Further, the side surfaces of the bolt sleeves are provided with flat bosses, and when the side surfaces of the bolt sleeves are provided with the fixing holes, the fixing holes are located on the flat bosses.

[0012] Further, the surfaces of the outer layer glass fiber reinforced plastic and the inner layer glass fiber reinforced plastic are fixedly provided with a layer of iron sheet, and each radial connecting member passes through the outer layer glass fiber reinforced plastic and / or the inner layer glass fiber reinforced plastic and the iron sheet thereof and is arranged in the corresponding fixing hole.

[0013] The utility model also provides a wind power blade which is provided with the blade root structure.

[0014] The utility model discloses beneficial effects that the fixing holes are radially arranged on the side surfaces of the bolt sleeves and / or the wedge-shaped strips, the outer layer glass fiber reinforced plastic and the inner layer glass fiber reinforced plastic are connected and fixed with the bolt sleeves and / or the wedge-shaped strips in the radial direction of the blade root through the radial connecting members passing through the outer layer glass fiber reinforced plastic and the inner layer glass fiber reinforced plastic, the interface delamination failure between the bolt sleeves, the wedge-shaped strips and the outer layer glass fiber reinforced plastic and the inner layer glass fiber reinforced plastic is prevented, the shear capacity of the blade root is improved, the bolt sleeve pulling-out failure caused by interface force in the actual operation stress process of the wind power blade is reduced, the structural strength of the blade root is improved, and the service life of the wind power blade is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a schematic view of the blade root structure embodiment one of the utility model.

[0016] Figure 2 It is a schematic view of the blade root structure embodiment two of the utility model.Figure 1 AA section view in the image.

[0017] Figure 3 This is a schematic diagram of the countersunk bolts used in the pre-embedding of the bolt sleeve in Embodiment 1 of the leaf root structure of this utility model.

[0018] Figure 4 This is a schematic diagram of Embodiment 2 of the leaf root structure of this utility model.

[0019] Figure 5 This utility model Figure 4 BB section view in the middle.

[0020] Figure 6 This is a schematic diagram of the countersunk bolts used in the pre-embedding of the bolt sleeve in Embodiment 2 of the leaf root structure of this utility model.

[0021] Figure 7 This is a schematic diagram of Embodiment 3 of the leaf root structure of this utility model.

[0022] Figure 8 This utility model Figure 7 CC section view in the image.

[0023] Figure 9 This is a schematic diagram of Embodiment 4 of the leaf root structure of this utility model.

[0024] Figure 10 This utility model Figure 9 DD section view in the image.

[0025] In the diagram: 1. Outer fiberglass; 2. Inner fiberglass; 3. Bolt sleeve; 301. Flat boss; 4. Wedge strip; 5. Sheet metal; 6. Double-ended screw; 7. First bolt; 8. Second bolt; 9. Nut; 10. Countersunk bolt. Detailed Implementation

[0026] like Figures 1-10 As shown, this utility model provides a blade root structure, including an outer fiberglass layer 1, an inner fiberglass layer 2, several bolt sleeves 3, several wedge-shaped strips 4, and several radial connectors. The bolt sleeves 3 and wedge-shaped strips 4 are pre-embedded between the outer fiberglass layer 1 and the inner fiberglass layer 2, and are staggered circumferentially along the blade root between the outer fiberglass layer 1 and the inner fiberglass layer 2. The wedge-shaped strips 4 are structural members with concave sides and an approximately I-shaped cross-section. Fixing holes are formed on the sides of the bolt sleeves 3 and / or the wedge-shaped strips 4 along the radial direction of the blade root. Each radial connector passes through the outer fiberglass layer 1 and / or the inner fiberglass layer 2 and is inserted into the corresponding fixing hole, so that the outer fiberglass layer 1 and the inner fiberglass layer 2 are fixed to the bolt sleeves 3 and / or the wedge-shaped strips 4 radially along the blade root.

[0027] The blade root structure provided by the utility model is based on the connecting mode of the embedded bolt sleeve, a fixing hole is radially arranged on the side surface of the bolt sleeve 3 and / or the wedge strip 4, the outer layer glass steel 1 and the inner layer glass steel 2 are connected and fixed with the bolt sleeve 3 and / or the wedge strip 4 in the radial direction of the blade root through the radial connecting piece which passes through the outer layer glass steel 1 and the inner layer glass steel 2, the interface between the bolt sleeve 3, the wedge strip 4 and the outer layer glass steel 1 and the inner layer glass steel 2 is prevented from delaminating and failing, meanwhile, the shear capacity of the blade root can be improved, the bolt sleeve 3 is prevented from being pulled out and failing due to the interface force in the actual stress process of the wind power blade, the structural strength of the blade root is improved, and the service life of the wind power blade is prolonged.

[0028] The first setting mode of the utility model, the fixing hole of the bolt sleeve 3 and / or the wedge strip 4 is a through hole, that is, the fixing hole is arranged through the side surface of the bolt sleeve 3 and / or the wedge strip 4 in the radial direction of the blade.

[0029] In the first setting mode, the fixing hole can be selectively arranged on the bolt sleeve 3 or the wedge strip 4 or on both the bolt sleeve 3 and the wedge strip 4 according to the actual strengthening requirement. Figure 1 And Figure 2 As shown in the first embodiment provided by the utility model, the bolt passes through the bolt sleeve 3 in the radial direction and simultaneously passes through the outer layer glass steel 1 and the inner layer glass steel 2. The fixing hole can be a smooth through hole or a threaded through hole and is screwed with the bolt to enhance the stability of the radial connection.

[0030] The second setting mode of the utility model, the fixing hole of the bolt sleeve 3 and / or the wedge strip 4 is a through hole, that is, the fixing hole is arranged through the side surface of the bolt sleeve 3 and / or the wedge strip 4 in the radial direction of the blade.

[0031] In the second setting mode, the fixing hole can be selectively arranged on the bolt sleeve 3 or the wedge strip 4 or on both the bolt sleeve 3 and the wedge strip 4 according to the actual strengthening requirement. Figure 7 And Figure 8As shown in the provided embodiment three, the first bolt 7 penetrates the wedge-shaped strip 4 radially and is arranged in the outer glass steel 1 and the inner glass steel 2, which is direct and effective, and can prevent cracks from the area where the wedge-shaped strip 4 is located to cause interface delamination failure. The fixing hole can be a smooth inner wall through hole, or a threaded through hole and is screwed with the first bolt 7 to enhance the stability of the radial connection.

[0032] In the above two setting modes, if the fixing holes are arranged on the bolt sleeves 3, in order to avoid the interference between the bolt sleeves 3 and the flanges during the installation of the wind turbine blade later, the fixing holes are arranged on the side of the end of the bolt sleeves 3 away from the root end face, that is, on the side of the end of the bolt sleeves 3 close to the tip.

[0033] In the third setting mode of the utility model, the fixing holes of the bolt sleeves 3 and / or the wedge-shaped strips 4 are threaded counterbores, that is, the fixing holes are threaded holes but do not penetrate the bolt sleeves 3 or the wedge-shaped strips 4, and the fixing holes on a single bolt sleeve 3 or a single wedge-shaped strip 4 are symmetrically arranged in two. The radial connecting piece is a second bolt 8, the outer glass steel 1 and the inner glass steel 2 are both arranged with the second bolt 8, and the end of the second bolt 8 is screwed with the corresponding fixing hole, that is, the outer glass steel 1 and the inner glass steel 2 are connected with the bolt sleeves 3 and / or the wedge-shaped strips 4 through the second bolt 8 at the corresponding positions, so as to radially reinforce and fix the root.

[0034] In the third setting mode, the fixing holes can be selectively arranged on the bolt sleeves 3 or the wedge-shaped strips 4 according to the actual reinforcement requirement, or the fixing holes are arranged on both the bolt sleeves 3 and the wedge-shaped strips 4. The embodiment in which the fixing holes are arranged on the bolt sleeves 3 is as shown in Figure 4 and Figure 5 The embodiment in which the fixing holes are arranged on the wedge-shaped strips 4 is as shown in Figure 9 and Figure 10 The embodiment four is shown. Since the second bolt 8 does not penetrate the bolt sleeve 3, the fixing holes are preferably arranged on the end side of the bolt sleeves 3 and / or the wedge-shaped strips 4 close to the root end face, which can improve the rigidity distribution, and through the second bolt 8 arranged on the bolt sleeve 3, the bolt sleeve 3 can resist the bolt sleeve 3 pulling out phenomenon caused by the increase of the load distribution.

[0035] In the above third setting mode, if the fixing holes are arranged on the bolt sleeves 3, the second bolt 8 can be selected as a conventional structure bolt, that is, as shown in Figure 5 If the fixing holes are arranged on the wedge-shaped strips 4, the second bolt 8 is preferably a stepped bolt, the diameter of the end is smaller, and the required fixing hole diameter is smaller, which can effectively prevent the interface delamination failure of the area where the wedge-shaped strip 4 is located and effectively prevent the failure of the wedge-shaped strip 4 itself.

[0036] A plurality of flat bosses 301 are arranged on the side of the bolt sleeve 3, and a plurality of fixing holes are arranged on the side of the bolt sleeve 3, and the fixing holes are arranged on the flat bosses 301. Based on the arrangement of the flat bosses 301, the flatness of the outer glass steel 1 and the inner glass steel 2 in the area of the fixing holes can be ensured after the layer pouring, and the fixing holes can be more effectively positioned and the perpendicularity can be ensured during the punching process of the outer glass steel 1 and the inner glass steel 2, and the glass steel area of the area of the flat bosses 301 is relatively thinner, and the punching operation can be more clearly performed.

[0037] In the utility model, when the radial connecting piece needs to be connected, the outer glass steel 1 and the inner glass steel 2 are punched in the radial direction of the blade root, so that the radial connecting piece can pass through. The surface of the outer glass steel 1 and the inner glass steel 2 is fixedly provided with an iron sheet 5, and the fixing mode is that the iron sheet 5 is glued by using structural glue, and each radial connecting piece passes through the outer glass steel 1 and / or the inner glass steel 2 and the iron sheet 5 and is arranged in the corresponding fixing hole. Based on the arrangement, the iron sheet 5 is wrapped on the inner and outer sides of the blade root by using the structural glue in the circumferential direction, so that the surface microcracks of the outer glass steel 1 and the inner glass steel 2 can be smoothed at the same time, the blade root can be further strengthened, the additional damage to the blade root caused by punching and screwing in the radial connecting piece can be reduced, and the load can be further distributed to the entire surface of the blade root by fixing the iron sheet 5, so that the reliability of the blade root structure is improved.

[0038] In the utility model, if the fixing hole is arranged on the wedge-shaped strip 4, the fixing hole can be arranged when the outer glass steel 1 and the inner glass steel 2 are punched. If the fixing hole is arranged on the bolt sleeve 3, the fixing hole is arranged before pre-burial, and in order to avoid that the resin enters the fixing hole and causes the hole to be closed during pre-burial, a counterbore bolt 10 is arranged in the fixing hole of the bolt sleeve 3 during pre-burial, and when the fixing hole penetrates the bolt sleeve 3 in the radial direction, the counterbore bolt 10 is arranged as shown in Figure 3 When the fixing hole is a threaded counterbore, the counterbore bolt 10 is arranged as shown in Figure 6 In order to avoid that the resin enters the inner hole of the counterbore bolt 10, the inner hole of the counterbore bolt 10 can be plugged with putty. After the outer glass steel 1 and the inner glass steel 2 are punched, the putty of the counterbore bolt 10 is taken out and the radial connecting piece is installed.

[0039] The utility model also provides a kind of wind power blade, the wind power blade is provided with the root structure as above, outer layer glass steel 1 and inner layer glass steel 2 can be connected and fixed with several bolt sleeve 3 and / or several wedge strip 4 in the radial direction of root, to prevent the interface delamination failure between bolt sleeve 3, wedge strip 4 and outer layer glass steel 1 and inner layer glass steel 2, also can improve the shear capacity at root, reduce bolt sleeve 3 pull-out failure problem caused by interface force in the actual operation stress process of wind power blade, improve the structural strength at root, prolong the service life of wind power blade.

[0040] Those skilled in the art should understand that the above discussion of any embodiment is only exemplary and is not intended to suggest that the scope of protection of the present application is limited to these examples; under the idea of the present application, the above embodiments or technical features in different embodiments can also be combined, steps can be implemented in any order, and there are many other changes of different aspects of one or more embodiments of the present application as described above, which are not provided in details for simplicity.

[0041] One or more embodiments of the present application are intended to cover all such alternatives, modifications and variations falling within the broad scope of the present application. Therefore, any omission, modification, equivalent replacement, improvement, etc. made within the spirit and principles of one or more embodiments of the present application should be included within the scope of protection of the present application.

Claims

1. A blade root structure, characterized by The blade root structure comprises an outer layer of glass fiber reinforced plastic (1), an inner layer of glass fiber reinforced plastic (2), a plurality of bolt sleeves (3), a plurality of wedge-shaped strips (4) and a plurality of radial connecting members, the plurality of bolt sleeves (3) and the plurality of wedge-shaped strips (4) are embedded between the outer layer of glass fiber reinforced plastic (1) and the inner layer of glass fiber reinforced plastic (2) and are arranged along the circumferential direction of the blade root alternately between the outer layer of glass fiber reinforced plastic (1) and the inner layer of glass fiber reinforced plastic (2), the side surface of the plurality of bolt sleeves (3) and / or the plurality of wedge-shaped strips (4) is provided with a fixing hole in the radial direction of the blade root, and each radial connecting member penetrates the outer layer of glass fiber reinforced plastic (1) and / or the inner layer of glass fiber reinforced plastic (2) and is arranged in the corresponding fixing hole, so that the outer layer of glass fiber reinforced plastic (1) and the inner layer of glass fiber reinforced plastic (2) are fixed with the plurality of bolt sleeves (3) and / or the plurality of wedge-shaped strips (4) in the radial direction of the blade root.

2. The blade root structure of claim 1, wherein The fixing hole of the plurality of bolt sleeves (3) and / or the plurality of wedge-shaped strips (4) is radially through, the radial connecting member is a double-headed screw rod (6), the double-headed screw rod (6) penetrates the outer layer of glass fiber reinforced plastic (1), the fixing hole and the inner layer of glass fiber reinforced plastic (2) at the same time, and the two ends of the double-headed screw rod (6) protrude from the surface of the outer layer of glass fiber reinforced plastic (1) and the inner layer of glass fiber reinforced plastic (2) and are locked and fixed by the nut (9).

3. The blade root structure of claim 1, wherein The fixing hole of the plurality of bolt sleeves (3) and / or the plurality of wedge-shaped strips (4) is radially through, the radial connecting member is a first bolt (7), the first bolt (7) penetrates the outer layer of glass fiber reinforced plastic (1), the fixing hole and the inner layer of glass fiber reinforced plastic (2) at the same time, and the end of the first bolt (7) protrudes from the surface of the outer layer of glass fiber reinforced plastic (1) or the inner layer of glass fiber reinforced plastic (2) and is locked and fixed by the nut (9).

4. The blade root structure of claim 1 wherein, The fixing hole of the plurality of bolt sleeves (3) and / or the plurality of wedge-shaped strips (4) is a threaded counterbore, and the fixing hole on a single bolt sleeve (3) or a single wedge-shaped strip (4) is symmetrically provided with two, the radial connecting member is a second bolt (8), the outer layer of glass fiber reinforced plastic (1) and the inner layer of glass fiber reinforced plastic (2) are both provided with the second bolt (8), and the end of the second bolt (8) is threadedly connected with the corresponding fixing hole.

5. The blade root structure of claim 4, wherein The second bolt (8) is a stepped bolt.

6. The blade root structure according to any one of claims 1-3, wherein When the side surface of the plurality of bolt sleeves (3) is provided with the fixing hole, the fixing hole is located on the side surface of one end of the plurality of bolt sleeves (3) away from the end surface of the blade root.

7. The blade root structure according to any one of claims 1, 4, 5, characterized in that The fixing hole is arranged on the side surface of one end of the plurality of bolt sleeves (3) and / or the plurality of wedge-shaped strips (4) close to the end surface of the blade root.

8. The blade root structure according to any one of claims 1-5, characterized in that The side surface of the plurality of bolt sleeves (3) is provided with a planar boss (301), and when the side surface of the plurality of bolt sleeves (3) is provided with the fixing hole, the fixing hole is located on the planar boss (301).

9. The blade root structure according to any one of claims 1-5, wherein The surface of the outer layer of glass fiber reinforced plastic (1) and the inner layer of glass fiber reinforced plastic (2) is fixedly provided with a layer of iron sheet (5), each radial connecting member penetrates the outer layer of glass fiber reinforced plastic (1) and / or the inner layer of glass fiber reinforced plastic (2) and the iron sheet (5) thereof and is arranged in the corresponding fixing hole.

10. A wind turbine blade, characterised in that The blade root structure is provided with the blade root structure according to any one of claims 1-9.

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