Truss type trailing edge structure, wind power blade and wind driven generator

Abstract

The utility model discloses a truss type trailing edge structure, a wind power blade and a wind driven generator, which comprise a vertical surface truss arranged beside a trailing edge beam, a first shell truss arranged on a suction surface and a second shell truss arranged on a pressure surface, one end of the second shell truss and one end of the first shell truss are connected with the upper side edge and the lower side edge of the vertical face truss respectively, and the other end of the second shell truss is connected with a beam cap of the pressure face of the wind power blade or the beam cap of the pressure face of the wind power blade and a corner of the shear web. The other end of the first shell truss is connected with a beam cap of a suction surface of the wind power blade or the beam cap of the suction surface of the wind power blade and a corner of the shear web, and the outer side of the first shell truss and the outer side of the second shell truss are both covered with pre-tensioning fabric membranes used for forming a closed aerodynamic configuration surface. The weight and the cost of the wind power blade can be greatly reduced, so that the generating efficiency and the cost per kilowatt hour of a wind driven generator are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of wind turbines, in particular to a truss-type trailing edge structure, a wind turbine blade and a wind turbine. Background Art

[0002] Wind energy has become a globally popular clean energy source due to its huge reserves, renewable nature, wide distribution and pollution-free nature. Wind power generation is currently the renewable energy power generation method with the most scalable development conditions and commercial development prospects.

[0003] Wind power generation effectively utilizes wind energy through the use of wind turbine blades. The blades drive the gearbox and generator to rotate, thereby converting mechanical energy into electrical energy that can be allocated to the public power grid. Current wind turbine blades mainly include a shell, a spar cap, and one or more shear webs. The spar cap is prefabricated or directly integrally molded with the shell using resin injection molding, and then the web is bonded to the shell and the shell itself using adhesive. As the length and weight of blades increase, structural design optimization and optimization of traditional materials are approaching the limits of their use. Therefore, it is very necessary to develop a new blade structure that fundamentally changes the design and material application of blades, greatly reducing the weight and cost of wind turbine blades, and thereby improving the power generation efficiency and cost per kilowatt-hour of wind turbines. Utility Model Content

[0004] The first purpose of the present utility model is to overcome the shortcomings of the existing technology and provide a truss trailing edge structure for wind turbine blades, which can reduce the weight of large blades of 100 meters as much as possible while maintaining rigidity and strength, and the truss structure adopts an integrated prefabricated molding to save manufacturing time and cost; a fabric membrane with tensioning force is fixed to the outside of the truss trailing edge structure, which provides an aerodynamic shape while restraining blade deformation, thereby ensuring wind power generation efficiency.

[0005] The second purpose of the present invention is to provide a wind turbine blade.

[0006] The third purpose of the present invention is to provide a wind turbine.

[0007] The first object of the utility model can be achieved by adopting the following technical solutions:

[0008] A truss-type trailing edge structure for a wind turbine blade, wherein the truss-type trailing edge structure is prefabricated in one piece and is arranged between the beam cap and the trailing edge beam of the wind turbine blade, the truss-type trailing edge structure includes a vertical truss arranged next to the trailing edge beam, a first shell truss arranged on the suction side, and a second shell truss arranged on the pressure side, one end of the second shell truss and the first shell truss are respectively connected to the upper and lower side edges of the vertical truss, the other end of the second shell truss is connected to the beam cap of the pressure side of the wind turbine blade or the corner of the beam cap and the shear web of the pressure side of the wind turbine blade, the other end of the first shell truss is connected to the beam cap of the suction side of the wind turbine blade or the corner of the beam cap and the shear web of the suction side of the wind turbine blade, and the outer sides of the first shell truss and the second shell truss are covered with a pre-tensioned tensioned fabric membrane for forming a closed aerodynamic shape surface.

[0009] Furthermore, the pre-tensioned fabric membrane is one of PTFE membrane, PVC membrane or ETFE membrane, with a thickness of 0.5 mm to 1.5 mm and a surface density of 500 g / m 2 ~1500g / m 2 , tensile strength is 500N / cm~2000N / cm, and elastic modulus is 1000kN / m~3000kN / m.

[0010] Furthermore, the facade truss is arranged perpendicular to the airfoil chord length line of the wind turbine blade.

[0011] Furthermore, the facade truss, the first shell truss and the second shell truss are respectively connected by a plurality of load-bearing structural members.

[0012] Furthermore, the load-bearing structural members of the first shell truss and the second shell truss are distributed along the span direction of the blade on the suction side and the pressure side, respectively, and an angle is formed between any two adjacent load-bearing structural members in the first shell truss, and an angle is formed between any two adjacent load-bearing structural members in the second shell truss, and the angle range is 0° to 180°.

[0013] Furthermore, the outer frame of the facade truss is a quadrilateral structure, and the two ends of the load-bearing structural member of the inner frame are respectively connected to the connection intersections of the first shell truss or the second shell truss and the facade truss.

[0014] Furthermore, the load-bearing structural members are connected by welding, fusion, gluing, mechanical connection or composite material joints.

[0015] Furthermore, the load-bearing structural member is a hollow rod or a solid rod, the cross section of which is a circular, elliptical or polygonal structure, and is made of fiber-reinforced composite material or metal material.

[0016] The second purpose of the utility model can be achieved by adopting the following technical solutions:

[0017] A wind turbine blade comprises the above-mentioned wind turbine blade truss trailing edge structure.

[0018] The third object of the present invention can be achieved by adopting the following technical solutions:

[0019] A wind turbine generator comprises the wind turbine blades described above.

[0020] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0021] 1. The trailing edge truss structure of the utility model can reduce the weight of the blade by more than 20% while maintaining the stiffness and strength of the blade. The lightweight blade can reduce the overall load on the wind turbine unit, thereby reducing the weight of components such as the wind turbine hub, generator, gearbox, tower, etc., thereby achieving maximum weight reduction and cost reduction of the wind turbine.

[0022] 2. The utility model forms a complete and closed aerodynamic shape by pre-tensioning the fabric membrane to ensure the power generation needs of the wind turbine.

[0023] 3. The truss-type trailing edge structure and the pre-tensioned fabric membrane in the present invention can be manufactured separately and then connected and assembled with the main structure of the blade, which can effectively save blade production time and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural schematic diagram of the truss-type trailing edge structure of the present invention.

[0025] Figure 2 It is a partial schematic diagram of the truss-type trailing edge structure of the present invention.

[0026] Figure 3 for Figure 2 A partial enlarged view of point A in the middle.

[0027] Figure 4 This is a schematic structural diagram of a wind turbine blade according to the present invention.

[0028] Figure 5 This is a schematic structural diagram of a wind turbine according to the present invention. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] Example 1:

[0031] like Figures 1 to 3 As shown, this embodiment provides a truss-type trailing edge structure of a wind turbine blade, which is prefabricated in one piece and arranged between the beam cap 606 and the trailing edge beam 611 of the wind turbine blade. The truss-type trailing edge structure includes a vertical truss 601 arranged next to the trailing edge beam 611, a first shell truss 602 arranged on the suction surface 609, and a second shell truss 603 arranged on the pressure surface 610. One end of the first shell truss 602 and the second shell truss 603 are respectively connected to the upper and lower sides of the vertical truss 601, and the other end of the second shell truss 603 is connected to the beam cap 606 of the pressure surface of the wind turbine blade or the pressure surface of the wind turbine blade. The spar cap 606 is connected to the corner of the shear web 607, and the other end of the first shell truss 602 is connected to the spar cap 606 of the suction side of the wind turbine blade or the spar cap 606 of the suction side of the wind turbine blade and the corner of the shear web 607. The outer sides of the first shell truss 602 and the second shell truss 603 are covered with a pre-tensioned tensioned fabric membrane 608. The pre-tensioned tensioned fabric membrane 608 is tensioned once or multiple times and then bonded to cover the outer sides of the first shell truss 602 and the second shell truss 603 to form a closed aerodynamic shape. At the same time, the tensioned pre-tensioned tensioned fabric membrane 608 has a certain strength, which can restrain the deformation of the blade.

[0032] The pre-tensioned fabric membrane 608 is made of PTFE membrane, PVC membrane or ETFE membrane with a thickness of 0.5mm to 1.5mm and a surface density of 500g / m 2 ~1500g / m 2 The tensile strength is 500N / cm~2000N / cm, the elastic modulus is 1000kN / m~3000kN / m, and the membrane material has excellent weather resistance, fatigue resistance, wear resistance and puncture resistance.

[0033] In this embodiment, the facade truss 601 is arranged perpendicular to the airfoil chord line of the wind turbine blade.

[0034] The facade truss 601 , the first shell truss 602 and the second shell truss 603 are respectively connected by a plurality of load-bearing structural members 604 .

[0035] The load-bearing structural members 604 of the first shell truss 602 and the second shell truss 603 are distributed along the blade span direction on the suction side and the pressure side, respectively, and an angle is formed between any two adjacent load-bearing structural members 604 in the first shell truss 602, and an angle is formed between any two adjacent load-bearing structural members 604 in the second shell truss 603. The angle range is 0° to 180°. The smaller the angle, the denser the distribution of the rods and the higher the stiffness of the shell truss.

[0036] The outer frame of the facade truss 601 is a quadrilateral structure, and the two ends of the inner frame's load-bearing structural member 604 are respectively connected to the connection intersection 605 of the first shell truss 602 or the second shell truss and the facade truss 601 to prevent the outer frame from large deformation.

[0037] The load-bearing structural members 604 are connected by welding, fusion, gluing, mechanical connection, or composite material joints. The load-bearing structural members 604 are hollow or solid rods with circular, elliptical, or polygonal cross-sections. In this embodiment, a hollow tube is used as an example, with an outer diameter of 70 mm to 90 mm and a wall thickness of 10 mm to 11 mm.

[0038] The load-bearing structural member 604 can be selected based on the material of the main blade structure. Currently, fiber-reinforced composite materials, including but not limited to glass fiber and carbon fiber, are preferred, with a modulus of 62 GPa to 145 GPa and a tensile strength of 1400 MPa to 1600 MPa. Alternatively, metal materials such as steel and light aluminum alloys can be used depending on actual design requirements.

[0039] The connection between the truss-type trailing edge structure and the blade body may comprise any suitable type of connection, including welding, fusing, gluing, mechanical connection or connection by means of a composite material joint.

[0040] The trailing edge truss structure of the utility model is novel in design, has a single component, and is highly manufacturable, ensuring that the blades can operate normally after weight reduction, significantly reducing the weight of wind turbine blades, reducing the operating load of wind turbines, and improving the power generation efficiency of wind turbines.

[0041] Example 2:

[0042] like Figure 4 As shown, this embodiment provides a wind turbine blade, including a wind turbine blade truss-type trailing edge structure.

[0043] Example 3:

[0044] like Figure 5 As shown, this embodiment provides a wind turbine, which can be a horizontal axis wind turbine or a vertical axis wind turbine. The wind turbine 6 includes a tower 1, a nacelle 2 installed on the tower 1, a generator 3 installed in the nacelle 2, a gearbox 4 for increasing the rotation speed, and a wind wheel 5 connected to the generator 3 through an axis. The wind wheel 5 carries a plurality of wind turbine blades 6 for capturing wind energy, namely the wind turbine blades described in Example 2.

[0045] The above is only a preferred embodiment of the present utility model patent, but the protection scope of the present utility model patent is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the scope disclosed by the present utility model patent based on the technical solution and the utility model patent concept of the present utility model patent, which falls within the protection scope of the present utility model patent.

Claims

1. A wind turbine blade truss trailing edge structure, characterized by: The truss-type trailing edge structure is prefabricated in one piece and is arranged between the beam cap and the trailing edge beam of the wind turbine blade. The truss-type trailing edge structure includes a vertical truss arranged next to the trailing edge beam, a first shell truss arranged on the suction side, and a second shell truss arranged on the pressure side. One end of the second shell truss and the first shell truss are respectively connected to the upper and lower side edges of the vertical truss, the other end of the second shell truss is connected to the beam cap of the pressure side of the wind turbine blade or the corner of the beam cap of the pressure side of the wind turbine blade and the shear web, the other end of the first shell truss is connected to the beam cap of the suction side of the wind turbine blade or the corner of the beam cap of the suction side of the wind turbine blade and the shear web, and the outer sides of the first shell truss and the second shell truss are covered with a pre-tensioned tensioned fabric membrane for forming a closed aerodynamic shape.

2. The wind turbine blade truss trailing edge structure according to claim 1, characterized in that: The pre-tensioned fabric membrane is one of PTFE membrane, PVC membrane or ETFE membrane, with a thickness of 0.5 mm to 1.5 mm and a surface density of 500 g / m 2 ~1500g / m 2 , tensile strength is 500N / cm~2000N / cm, and elastic modulus is 1000kN / m~3000kN / m.

3. The wind turbine blade truss trailing edge structure according to claim 1, characterized in that: The vertical truss is arranged perpendicular to the airfoil chord length line of the wind turbine blade.

4. The wind turbine blade truss trailing edge structure according to claim 1, characterized in that: The facade truss, the first shell truss and the second shell truss are respectively formed by connecting a plurality of load-bearing structural members.

5. The wind turbine blade truss trailing edge structure according to claim 4, characterized in that: The load-bearing structural members of the first shell truss and the second shell truss are respectively distributed along the span direction of the blade on the suction side and the pressure side, and an angle is formed between any two adjacent load-bearing structural members in the first shell truss, and an angle is formed between any two adjacent load-bearing structural members in the second shell truss, and the angle range is 0° to 180°.

6. The wind turbine blade truss trailing edge structure according to claim 4, characterized in that: The outer frame of the facade truss is a quadrilateral structure, and the two ends of the load-bearing structural member of the inner frame are respectively connected to the connection intersections of the first shell truss or the second shell truss and the facade truss.

7. The wind turbine blade truss trailing edge structure according to claim 4, characterized in that: The load-bearing structural members are connected by welding, fusion, gluing, mechanical connection or composite material joints.

8. The wind turbine blade truss trailing edge structure according to claim 4, characterized in that: The load-bearing structural member is a hollow rod or a solid rod, the cross section of which is a circular, elliptical or polygonal structure, and is made of fiber-reinforced composite material or metal material.

9. A wind turbine blade, characterized in that: It comprises the wind turbine blade truss trailing edge structure according to any one of claims 1 to 8.

10. A wind turbine, characterized in that: Including the wind turbine blade according to claim 9.

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