CN113757035A

CN113757035A - Sectional type blade, manufacturing method thereof and wind generating set

Info

Publication number: CN113757035A
Application number: CN202010499992.2A
Authority: CN
Inventors: 李洋龙; 陈军; 李玉麒
Original assignee: Urumqi Jinfeng Tianyi Wind Power Co ltd
Current assignee: Urumqi Jinfeng Tianyi Wind Power Co ltd
Priority date: 2020-06-04
Filing date: 2020-06-04
Publication date: 2021-12-07

Abstract

The invention provides a sectional type blade, a manufacturing method thereof and a wind generating set, wherein the sectional type blade comprises the following components: at least two blade segments, wherein the adjacent first blade segment and the second blade segment in the at least two blade segments are provided with a first lap joint part and a second lap joint part which are sleeved with each other, and the inner peripheral surface of the first lap joint part is sleeved on the outer peripheral surface of the second lap joint part; and a connecting member, both ends of which are fixed to the first and second straps to connect the adjacent first and second blade segments to each other. According to the sectional type blade, the manufacturing, transportation, dismounting and mounting of the blade can be more convenient, and the cost can be reduced.

Description

Sectional type blade, manufacturing method thereof and wind generating set

Technical Field

The invention relates to the technical field of wind power generation, in particular to a sectional type blade, a method for manufacturing the sectional type blade and a wind generating set comprising the sectional type blade.

Background

At present, the application of wind energy is more and more extensive, and a wind generating set realizes the conversion between wind energy and electric energy. The blade is a core component of the wind generating set, and the wind sweeping area of the blade directly determines the output electric quantity of the wind generating set.

With the increasing of the single machine capacity of the wind generating set, the size of the wind generating set blade is also increased, but the blade is very inconvenient in the processes of manufacturing, transporting, installing and the like. In addition, as the service life of the blade reaches the scrapping stage, the problem of treatment after the blade is retired becomes a major problem in the blade industry.

Disclosure of Invention

Therefore, the invention aims to provide a sectional type blade and a wind generating set so as to solve the problems that the conventional blade is inconvenient to manufacture, transport, install and the like.

Another object of the present invention is to provide a method for manufacturing a segmented blade, so as to solve the problem that the blade cannot be disposed after being retired.

According to an aspect of the present invention, there is provided a segmented vane comprising: at least two blade segments, wherein the adjacent first blade segment and the second blade segment in the at least two blade segments are provided with a first lap joint part and a second lap joint part which are sleeved with each other, and the inner peripheral surface of the first lap joint part is sleeved on the outer peripheral surface of the second lap joint part; and a connecting member, both ends of which are fixed to the first and second straps to connect the adjacent first and second blade segments to each other.

Alternatively, the first overlap may be located at an end of the first blade section facing in the direction of the blade tip, and the second overlap may be located at an end of the second blade section facing in the direction of the blade root.

Alternatively, the connecting member may be provided in plural, and the plural connecting members may be parallel to each other and arranged in the same plane.

Alternatively, the plurality of connecting members may be arranged perpendicular to the spanwise direction of the segmented blade.

Alternatively, the connecting member may be adjustable in length, and may include an adjusting portion and first and second connecting portions connected to both ends of the adjusting portion, the first connecting portion being threadedly connected to a first end of the adjusting portion, and the second connecting portion being threadedly connected to a second end of the adjusting portion.

Alternatively, the adjusting part may be an internally threaded tube, the internally threaded tube may have a first internally threaded part at a first end of the internally threaded tube and a second internally threaded part at a second end of the internally threaded tube, the turning directions of the internal threads of the first and second internally threaded parts may be opposite, and the ends of the first and second connecting parts may have external threads and be inserted into the first and second internally threaded parts, respectively, wherein the ends of the first and second connecting parts exposed to the outside may be formed with a pin part, and the pin part may be formed in a pyramid shape so as to be inserted into the pin holes formed in the first and second overlapping parts.

Alternatively, the regulating portion may be a double threaded screw, the first and second connecting portions may be connecting rods having an internal threaded hole at one end, the external thread directions of the double threaded screw may be reversed and inserted into the internal threaded holes of the connecting rods, respectively, and the other end of the connecting rod may be formed in a pyramid shape so as to be inserted into pin holes formed in the first and second overlapping portions.

Alternatively, the inner circumferential surface of the first overlapping part and the outer circumferential surface of the second overlapping part may be two tapered surfaces that fit each other.

According to another aspect of the present invention, there is provided a method for manufacturing a segmented blade as described above, the method comprising: preparing at least two blade segments, wherein the step of preparing each of the at least two blade segments comprises: preparing a composite material; filling a composite material in a mold in which a molding space corresponding to the shape of the blade section is formed; and performing a curing process on the composite material at a predetermined temperature to obtain a blade segment; and sleeving a first overlapping portion of an adjacent first blade segment and a second overlapping portion of a second blade segment of the at least two blade segments to each other, and fixing both ends of a connection member to the first overlapping portion and the second overlapping portion to connect the first blade segment and the second blade segment to each other.

Alternatively, the step of filling the composite material in the mold in which the blade forming space corresponding to the shape of the blade section is formed may include: filling a composite material in a first molding space of a first mold to obtain a first blade section; and filling a composite material in a second molding space of the second mold to obtain a second blade part, wherein the shape of the first molding space corresponds to the shape of the first blade part, and the shape of the second molding space corresponds to the shape of the second blade part.

Optionally, the method may further comprise: the first blade section and the second blade section are connected to each other to form a blade segment.

Alternatively, the first blade portion may be the portion comprising the suction side of the blade segment and the second blade portion may be the portion comprising the pressure side of the blade segment.

Optionally, the composite material may include a semi-cured material formed by mixing a resin and a reinforcing material, wherein the reinforcing material may include fibers, and the length of the fibers may be in a range of 30-50 mm.

According to another aspect of the invention, a wind power plant is provided, comprising the above-described segmented blade.

According to the sectional type blade, the manufacturing, transportation, dismounting and mounting of the blade can be more convenient, and the cost can be reduced. Further, according to the sectional type blade of the present invention, the structural strength of the sectional type blade can be improved by using the first and second overlapping portions and the connecting member in cooperation. In addition, the sectional type blade has the advantages of simple structure, stable operation, energy conservation and environmental protection.

In addition, according to the method for manufacturing the sectional type blade, due to the adoption of the manufacturing mode of the die pressing process, the manufacturing is conveniently finished by using automatic mechanical equipment, so that the labor input can be reduced, and meanwhile, the production period of the blade can be greatly reduced. In addition, according to the method for manufacturing the sectional type blade, the recycled material of the fiber reinforced composite material is utilized, so that the recycling problem of the fiber reinforced composite material is solved, and energy conservation and environmental protection are realized.

Drawings

The above and other objects and features of the present invention will become more apparent from the following description of the embodiments taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a schematic view of a segmented blade according to an embodiment of the invention.

FIG. 2 is a cross-sectional view of a segmented blade according to an embodiment of the invention.

FIG. 3 is a cross-sectional view illustrating connections between blade segments of a segmented blade according to an embodiment of the present invention.

FIG. 4 is a schematic view of a connecting member of a segmented blade according to an embodiment of the invention.

Fig. 5 is an enlarged view of a portion a in fig. 3.

Fig. 6 is an enlarged view of a portion B in fig. 3.

FIG. 7 is a split schematic view of a blade segment of a segmented blade according to an embodiment of the invention.

The reference numbers illustrate:

10: a first leaf segment; 20: a second blade segment; 30: a third leaf segment; 11: a first lap joint portion; 21: a second lap joint portion; 22: a third lap joint portion; 31: a fourth lap joint portion; 40: a connecting member; 41: an adjustment section; 42: a first connection portion; 43: a second connecting portion; 421. 431: a pin portion; 101: a first blade portion; 102: a second blade portion; 101A, 102A: a first end; 101B, 102B: a second end.

Detailed Description

Embodiments in accordance with the present invention will now be described in detail with reference to the drawings, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.

The invention provides a sectional type blade, aiming at solving the problems of inconvenient manufacturing, transportation, installation and the like of the blade. The segmented blade according to the present invention includes at least two blade segments and a connecting member for connecting the at least two blade segments, adjacent two blade segments being nested with each other, both ends of the connecting member being fixed to portions where the adjacent two blade segments are nested with each other to connect the adjacent two blade segments with each other.

Hereinafter, a sectional type blade according to an embodiment of the present invention will be described in detail with reference to fig. 1 to 6.

As shown in fig. 1 and 2, the segmented blade may include a first blade segment 10, a second blade segment 20, and a third blade segment 30. Adjacent first and

second blade segments

10, 20 are nested within each other and connected by a connecting member 40, and adjacent second and

third blade segments

20, 30 are nested within each other and connected by a connecting member 40. Although the segmented blade is shown to include three blade segments, the number of blade segments is not limited thereto. The segmented blade may comprise several blade segments as required to meet the length required in the actual application.

As shown in fig. 3, the first blade section 10 may have a first overlapping portion 11, and the first overlapping portion 11 may be located at an end of the first blade section 10 facing the tip direction. The second blade segment 20 may have a second overlap 21, and the second overlap 21 may be located at an end of the second blade segment 20 facing the blade root. The inner peripheral surface of the first lap portion 11 may be fitted over the outer peripheral surface of the second lap portion 21. Both ends of the connection member 40 may be fixed to the first and

second straps

11 and 21 to sequentially connect the adjacent first and

second blade segments

10 and 20. Specifically, the end portions of the connection member 40 may be inserted into the first and second overlapping

portions

11 and 21 in a direction substantially perpendicular to the length of the first blade segment 10, thereby preventing the first and

second blade segments

10 and 20 from being separated and falling off from each other in the length direction and the circumferential direction.

Similarly, the second blade segment 20 may have a third lap 22, and the third lap 22 may be located at an end of the second blade segment 20 facing the tip direction. The third blade section 30 may have a fourth overlap 31, and the fourth overlap 31 may be located at an end of the third blade section 30 facing the blade root. The inner peripheral surface of the third lap portion 22 may be fitted over the outer peripheral surface of the fourth lap portion 31. Both ends of the connecting member 40 may be fixed to the third and

fourth laps

22 and 31 to connect the adjacent second and

third blade segments

20 and 30 to each other.

The adjacent first and

second blade segments

10 and 20 and the adjacent second and

third blade segments

20 and 30 are locked by the connecting member 40, so that the first, second and

third blade segments

10, 20 and 30 are prevented from being unnecessarily displaced and vibrated during operation.

The connecting members 40 may be rod-shaped as a whole and provided in plurality in adjacent two blade segments, and the plurality of connecting members 40 may be provided in parallel with each other. As an example, the plurality of connecting members 40 connecting two adjacent blade segments may be arranged perpendicular to the spanwise direction of the segmented blade. Preferably, the plurality of connecting members 40 connecting two adjacent blade segments may lie in the same plane, more particularly, in the same plane perpendicular to the spanwise direction of the segmented blade.

The length of the connecting member 40 may be adjusted to facilitate placement in different locations and connection of different blade segments. The connection member 40 may be made of a metal material to provide sufficient strength. As an example, referring to fig. 4, the connection member 40 may include an adjustment part 41 and first and

second connection parts

42 and 43 connected to both ends of the adjustment part 41, respectively. The first connecting portion 42 may be threadedly coupled to a first end of the adjusting portion 41, and the second connecting portion 43 may be threadedly coupled to a second end of the adjusting portion 41, so as to enable the length of the connecting member 40 to be adjustable.

For example, the adjusting portion 41 may be an internally threaded tube, which may include a first threaded portion and a second threaded portion at both ends of the internally threaded tube, respectively, and the internal threads of the first internally threaded portion and the second internally threaded portion may have opposite rotation directions. The first and

second connection parts

42 and 43 may be first and second connection rods respectively inserted into the internally threaded tube from both ends thereof, the ends of the first and second connection rods having external threads, and the thread directions of the first and second connection rods being opposite. The outer portion of the internally threaded tube may be processed to have an anti-slip surface and may be connected to the first and second connecting rods through internal threads, so that the movement of the first and second connecting rods with respect to the internally threaded tube may be controlled simultaneously by rotating the internally threaded tube, thereby achieving the length-adjustability of the connecting member 40.

Ends of the first and second connection rods exposed to the outside may be formed with first and

second pins

421 and 431, respectively. The first pin portion 421 and the second pin portion 431 may be supported using a wear-resistant, hard, corrosion-resistant material, etc., and may be integrally formed with the first connecting rod and the second connecting rod. Of course, the first pin 421 and the second pin 431 may also be formed separately from the first connecting rod and the second connecting rod. Further, the first pin portion 421 and the second pin portion 431 may be formed in a cone shape, the first strap part 11 and the second strap part 21 may be formed with pin holes corresponding to each other at positions corresponding to each other, the first pin portion 421 may be simultaneously inserted into the pin holes of the first strap part 11 and the pin holes of the second strap part 21, and the second pin portion 431 may be simultaneously inserted into the pin holes of the first strap part 11 and the pin holes of the second strap part 21 to connect the first blade section 10 and the second blade section 20 to each other.

For another example, the adjustment portion 41 may be a double-threaded screw, and the first and

second connection portions

42 and 43 may be first and second connection rods having female screw holes at one ends thereof. The external thread directions of the double-headed screw may be opposite and inserted into the internal thread holes of the first and second connection bars, respectively, and the other ends of the first and second connection bars may be formed in a pyramid shape so as to be inserted into the pin holes formed in the first and

second laps

11 and 21 or the third and

fourth laps

22 and 31.

Of course, the above is merely an example of the connection member 40, and the structure thereof is not limited thereto. For example, the connection member 40 may also be formed in a structure similar to a hydraulic cylinder or a pneumatic cylinder, both ends of which are formed with connection portions, for example, in a cone shape.

In this embodiment, two adjacent blade segments have overlapping portions that nest with each other, so there is friction between the overlapping portions. Preferably, as shown in fig. 6, the inner circumferential surface of the first overlapping part 11 and the outer circumferential surface of the second overlapping part 21 may be two tapered surfaces that are fitted to each other. In the process that the sectional type blade rotates along with the hub, the sectional type blade is acted by a centrifugal force, and in the case that the inner peripheral surface of the first overlapping part 11 and the outer peripheral surface of the second overlapping part 21 are two conical surfaces which are matched with each other, the component force of the centrifugal force increases the friction force between the first overlapping part 11 and the second overlapping part 21, and the friction force can prevent the displacement of each blade section in the centrifugal force direction in the rotation process of the impeller to a certain extent. Also, the connection member 40 is inserted into the pin holes formed at the first and

second laps

11 and 21, and the first and

second blade segments

10 and 20 may be locked by the friction between the connection member 40 and the first and

second laps

11 and 21, thereby preventing the adjacent two blade segments from being separated. In installing the adjacent first and

second blade segments

10 and 20, the inner circumferential surface of the first overlap 11 and the outer circumferential surface of the second overlap 21 may be first completely engaged and then locked using the connection member 40. The locking and installation between the second blade section 20 and the third blade section 30 is similar to that described above.

Next, a method of manufacturing a segmented blade according to an embodiment of the present invention will be described.

The method of manufacturing a segmented blade comprises: preparing at least two blade segments; overlapping portions of the respective two blade segments are fitted to each other, and both ends of the connecting member are fixed to the overlapping portions to connect the adjacent two blade segments to each other.

Hereinafter, for convenience of description, the first and

second blade sections

10 and 20 of the segmented blade will be described as an example.

The method of manufacturing a segmented blade comprises: preparing a first leaf segment 10 and a second leaf segment 20; the first overlapping part 11 of the first blade segment 10 and the second overlapping part 21 of the second blade segment 20 are fitted to each other, and both ends of the connection member 40 are fixed to the first overlapping part 11 and the second overlapping part 21 to connect the first blade segment 10 and the second blade segment 20 to each other.

The step of preparing each of the first blade segment 10 and the second blade segment 20 comprises: preparing a composite material; filling a composite material in a mold in which a molding space corresponding to the shape of the blade section is formed; and performing a curing process on the composite material at a predetermined temperature to obtain a blade segment.

Next, the manufacturing steps of the blade segment will be specifically described by taking the manufacturing of the first blade segment 10 as an example.

First, a composite material is prepared, and the composite material may be a semi-cured material including a mixture of a resin and a reinforcing material. Then, a mold in which a molding space corresponding to the shape of the first blade section 10 is formed is filled with a composite material. Then, a curing process is performed on the composite material at a predetermined temperature to obtain the first blade segment 10. The first blade section 10 may be integrally formed or may be separately formed and then joined together. As an example, as shown in fig. 7, the first blade segment 10 may be divided into a first blade portion 101 and a second blade portion 102, the first blade portion 101 may be a portion including a suction side of the first blade segment 10, and the second blade portion 102 may be a portion including a pressure side of the first blade segment 10.

The step of forming the first blade section 10 by split molding and then joining may comprise: filling a composite material in a first molding space of a first mold (the shape of the first molding space corresponds to the shape of the first blade section 101) to obtain a first blade section 101; filling a second forming space of the second mould (the shape of the second forming space corresponds to the shape of the second blade section) with a composite material to obtain a second blade section 102; the first blade section 101 and the second blade section 102 are connected to each other to form a complete first blade section 10.

As an example, each of the first and second molds may be divided into an upper mold and a lower mold, and a cavity may be formed between the upper mold and the lower mold, and the composite material may be filled in the cavity. Then, a curing process (e.g., vacuum curing) is performed at a predetermined temperature to obtain the first blade portion 101 and the second blade portion 102. The first and second ends 101A, 101B of the first blade section 101 may then be bonded or mechanically or otherwise bonded together with the first and second ends 102A, 102B of the second blade section 102, respectively. The first ends 101A and 102A and the second ends 101B and 102B may be bonding points along the leading/trailing edge of the first blade section 10, respectively, to bond together into one complete first blade section 10. Of course, the number and size of the molds can be adjusted by the shape, size, etc. of the designed blade segment.

The prepared composite material can be a semi-solidified material formed by mixing resin and a reinforcing material, and the reinforcing material can comprise fibers. Preferably, the length of the fibers may be in the range of 30 to 50 mm. The composite material may be prepared based on raw materials or may be obtained from a decommissioned blade such that a portion of the material of the decommissioned blade is recycled. The sectional type blade is manufactured by the die pressing method by utilizing the waste fiber reinforced composite material in the retired blade, so that the waste fiber reinforced composite material can be effectively recycled, and the damage of the retired product of the fiber reinforced composite material to the environment can be reduced to the utmost extent.

For example, the composite material may include glass/carbon fiber recyclates and matrix recyclates (unsaturated resins), and may further include low profile additives, fillers, and various auxiliaries, as needed. The glass/carbon fiber recycled material and the matrix recycled material can be respectively derived from a fiber section and a resin recycled material generated by the recycled waste fiber reinforced composite material. The length of the fiber section can be controlled within 30-50 mm, and the resin reclaimed material is treated by a preset process to remove impurities.

For example, prior to preparing the composite, the fiber segments may be dried prior to premixing, at a temperature of 200 ℃ for a period of 10-30 minutes, allowed to air further, or may be dried and heated to reduce moisture. The fiber sections from which water is removed and the resin recyclates from which impurities are removed may then be mixed in predetermined proportions or, if desired, with the addition of auxiliary additives (e.g., low shrinkage additives, fillers and various auxiliaries) to ensure characteristics such as mechanical properties (e.g., modulus of elasticity (MOE), static bending strength (MOR), internal bond strength (IB)) and physical properties (e.g., density, moisture content, water absorption, coefficient of expansion) of the finished product, thereby meeting the basic requirements of blade operation.

After the first and

second blade segments

10 and 20 are manufactured, the first and

second straps

11 and 21 may be completely fitted and lapped by pulling pretension in the tip direction, and then the first and

second blade segments

10 and 20 are locked using the connecting member 40, thereby completing the installation process.

According to still another embodiment of the invention, a wind generating set comprising the segmented blade is provided, and the beneficial effects are the same as those of the segmented blade, so that the detailed description is omitted.

Although the embodiments of the present invention have been described in detail above, those skilled in the art may make various modifications and alterations to the embodiments of the present invention without departing from the spirit and scope of the present invention. It will be understood that modifications and variations may occur to those skilled in the art, which modifications and variations may be within the spirit and scope of the embodiments of the invention as defined by the appended claims.

Claims

1. A segmented vane, comprising:

at least two blade segments, wherein adjacent first (10) and second (20) of the at least two blade segments have a first overlap (11) and a second overlap (21) that overlap each other, and wherein the inner circumferential surface of the first overlap (11) overlaps the outer circumferential surface of the second overlap (21);

a connecting member (40), both ends of the connecting member (40) being fixed to the first and second laps (11, 21) to connect the adjacent first and second blade segments (10, 20) to each other.

2. The segmented blade according to claim 1, characterized in that the first overlap (11) is located at the end of the first blade segment (10) facing the tip direction and the second overlap (21) is located at the end of the second blade segment (20) facing the root direction.

3. The segmented blade according to claim 1, wherein the connecting member (40) is provided in plurality, the connecting members (40) being parallel to each other and arranged in the same plane.

4. The segmented blade according to claim 3, wherein a plurality of the connecting members (40) are arranged perpendicular to the spanwise direction of the segmented blade.

5. The segmented blade according to claim 1, wherein the connecting member (40) is length-adjustable and comprises an adjusting portion (41) and a first connecting portion (42) and a second connecting portion (43) connected to both ends of the adjusting portion (41), the first connecting portion (42) being in threaded connection with a first end of the adjusting portion (41), the second connecting portion (43) being in threaded connection with a second end of the adjusting portion (41).

6. The segmented blade according to claim 5, wherein the adjustment portion (41) is an internally threaded tube having a first internally threaded portion at a first end of the tube and a second internally threaded portion at a second end of the tube, the internal threads of the first and second internally threaded portions having opposite hand, the ends of the first and second connection portions (42, 43) having external threads and being inserted into the first and second internally threaded portions, respectively,

wherein the ends of the first and second connection parts (42, 43) exposed to the outside are formed with pin parts (421, 431), and the pin parts (421, 431) are formed in a cone shape so as to be inserted into pin holes formed in the first and second overlapping parts (11, 21).

7. The segmented blade according to claim 5, wherein the adjusting portion (41) is a double threaded screw, the first connecting portion (42) and the second connecting portion (43) are connecting rods having internally threaded holes at one ends, the external threads of the double threaded screw are oppositely threaded and are respectively inserted into the internally threaded holes of the connecting rods, and the other ends of the connecting rods are formed in a pyramid shape so as to be inserted into pin holes formed in the first and second straps (11, 21).

8. The segmented blade according to claim 1, wherein the inner peripheral surface of the first strap part (11) and the outer peripheral surface of the second strap part (21) are two conical surfaces that fit into each other.

9. A method for manufacturing a segmented blade according to claim 1, comprising:

preparing at least two of the blade segments, wherein the step of preparing each of the at least two blade segments comprises: preparing a composite material; filling a composite material in a mold in which a molding space corresponding to the shape of the blade segment is formed; and performing a curing process on the composite material at a predetermined temperature to obtain the blade segment; and

sleeving a first overlapping part (11) of the first blade segment (10) and a second overlapping part (12) of the second blade segment (20) which are adjacent of at least two of the blade segments with each other, and fixing both ends of the connecting member (40) to the first overlapping part (11) and the second overlapping part (12) to connect the first blade segment (10) and the second blade segment (20) with each other.

10. The method of claim 9, wherein the step of filling the composite material in the mold in which the blade forming space corresponding to the shape of the blade segment is formed comprises:

filling the composite material in a first forming space of a first mould to obtain a first blade section;

filling the second forming space of the second mould with the composite material to obtain a second blade section,

wherein the first molding space has a shape corresponding to a shape of the first blade portion, and the second molding space has a shape corresponding to a shape of the second blade portion.

11. The method of claim 10, further comprising:

connecting the first blade section and the second blade section to each other to form the blade segment.

12. The method of claim 10, wherein the first blade portion is a portion that includes a suction side of the blade segment and the second blade portion is a portion that includes a pressure side of the blade segment.

13. The method according to claim 9, wherein the composite material comprises a semi-cured material in which a resin and a reinforcing material are mixed,

the reinforcing material comprises fibers, and the length of the fibers is within the range of 30-50 mm.

14. A wind park according to any of claims 1-8, wherein the wind park comprises a segmented blade according to any of claims 1-8.