CN210440151U

CN210440151U - Increase power increase part of fan blade root power

Info

Publication number: CN210440151U
Application number: CN201921243110.5U
Authority: CN
Inventors: 王鹏飞; 刘军华; 艾则孜瑞楠德; 孙思阳
Original assignee: Shandong Qidi Kaite Bote Marine Technology Co Ltd
Current assignee: Shandong Qidi Kaite Bote Marine Technology Co Ltd
Priority date: 2019-08-02
Filing date: 2019-08-02
Publication date: 2020-05-01
Anticipated expiration: 2029-08-02

Abstract

The utility model discloses an increase power increase part of fan blade root power. The power increasing component consists of a pressure surface shell and a suction surface shell, and is bonded with the root of the fan blade through structural adhesive. The shape of the power increasing component is a pneumatic wing shape, the power increasing component is mainly installed between the end face of the root of the fan blade and the position of the maximum chord length, and the power generation efficiency of the fan blade is improved by changing the shape of the root of the fan blade.

Description

Increase power increase part of fan blade root power

Technical Field

The utility model relates to a wind-powered electricity generation field especially relates to a power increase part for increasing fan blade root power.

Background

Wind energy is a clean energy with huge reserves and no pollution, and wind power is vigorously developed in all countries in the world. Wind resources in China are very rich, and through rapid development for many years, the wind power industry in China develops rapidly, the annual loading capacity is the first in the world, and the design technology of related parts of wind driven generators is more and more mature, and the wind driven generators can be developed and produced independently gradually.

The wind power generator can convert wind energy into mechanical energy, then convert the mechanical energy into electric energy and transmit the electric energy for a long distance, wherein, the blade is the most main part for converting the wind energy, the pneumatic performance of the blade directly influences the generating efficiency, the blade is generally in a wing shape, and wind generates lift force when flowing through the wing shape, thereby pushing the wind wheel to rotate and generating the mechanical energy.

The airfoil relative thickness refers to the thickness to length ratio of the airfoil, typically expressed in percentages. The smaller the relative thickness, the higher the aerodynamic efficiency of the airfoil, but the lower the structural strength, while the larger the relative thickness of the airfoil, the higher the structural safety, but at the expense of the corresponding aerodynamic performance. Therefore, in the blade design process, the blade is designed into a structural form that the root airfoil section is large in relative thickness and the tip section is small in relative thickness, and both the pneumatic efficiency and the structural safety are considered. The blade root is usually designed to be circular, facilitating blade mounting and increasing structural safety without aerodynamic efficiency. Then gradually transition into an aerodynamic airfoil, the transition length usually accounts for 10% -20% of the whole blade length, and therefore very much aerodynamic performance is lost.

With global warming, the wind speed in China is reduced seriously, and each wind farm is actively searching for a method for increasing the power generation efficiency of the blades.

Disclosure of Invention

The blade of present design has reduced the aerodynamic performance of blade root owing to structural design's requirement usually, if design a part, through installing in the root of having operated fan blade or newly-produced blade, changes the root appearance of fan blade, makes the blade root become the aerodynamic airfoil shape, can increase the generating efficiency when the blade rotates on the one hand, and on the other hand can reduce the start-up wind speed of fan, makes the fan alright generate electricity under very little wind speed.

For the newly produced blade, the power increasing component can be installed in a factory, and the installation cost is low. For the installed and operated blades, if the blades are hoisted to the ground and then installed, the hoisting cost is very high, and the economic benefit is greatly reduced, so that a high-altitude installation method can be used, and the reconstruction cost is reduced. Therefore, it is necessary to design a method for installing power-increasing components, which is suitable for both ground installation and high-altitude installation.

According to one aspect of the utility model, a power increasing component for increasing the power of the root part of a fan blade is provided, the power increasing component is in the shape of a pneumatic wing and consists of a pressure surface shell and a suction surface shell, and the pressure surface shell and the suction surface shell are bonded with the root part of the fan blade into a whole through structural adhesive; the pressure surface shell and the suction surface shell of the power increasing component are of sandwich structures, the inner surface and the outer surface of each sandwich structure are glass fiber reinforced plastic skins, and each sandwich layer comprises two glass fiber reinforced plastic wedge-shaped strips and foam.

The pressure surface shell and the suction surface shell are bonded with the outer surface of the root of the fan blade through structural adhesive to form a new blade root aerodynamic shape. The power increasing component has the main function of improving the pneumatic efficiency, and simultaneously, the root of the fan blade is used as a bearing structure of the power increasing component, and the pneumatic load of the power increasing component is transmitted to the blade. The two glass fiber reinforced plastic wedge-shaped strips are positioned on two sides of the position with the maximum thickness of the power increasing component, are bonded with the root of the fan blade through structural adhesive, and are main stress structures for connecting the power increasing component and the fan blade. The glass fiber in the glass fiber reinforced plastic wedge-shaped strip is consistent with the length direction of the blade, and the foam is low-density PVC foam, so that the integral rigidity of the component is increased.

The utility model provides a blade root increases power part installs between the root terminal surface of blade to the biggest chord length position of blade, and this region is the transition region between the circular and the aerodynamic profile type of blade root, mainly considers the structural performance of blade, therefore pneumatic efficiency is very low. Through increasing the merit part, change the appearance of blade root, make blade root become the airfoil shape that aerodynamic efficiency is high, the aerodynamic efficiency when can improving fan blade operation on the one hand, on the other hand has reduced the start-up wind speed of fan for the fan can start under lower wind speed, increases the generated energy. The maximum thickness of the pneumatic wing profile of the power increasing component is connected with the root of the fan blade, so that the relative thin thickness of the power increasing component is ensured, the high pneumatic performance is achieved, and the connection between the power increasing component and the root of the fan blade is realized.

The utility model discloses provide simultaneously increase power parts's preparation and mounting method, including following step:

(1) respectively manufacturing a pressure surface shell mold and a suction surface shell mold according to the shape of the power increasing component;

(2) and sequentially laying outer skin glass fiber, glass fiber reinforced plastic wedge-shaped strips, foam and inner skin glass fiber in the shell molds of the pressure surface and the suction surface of the power increasing component, wherein the glass fiber reinforced plastic wedge-shaped strips are positioned at the position with the maximum thickness of the power increasing component. The pressure surface shell and the suction surface shell are respectively integrated by a resin vacuum infusion method. When the pressure surface shell and the suction surface shell are manufactured, the flanging structures of the front edge and the rear edge are reserved;

(3) the pressure surface shell and the suction surface shell are respectively fixed with the pressure surface tool and the suction surface tool and are fixedly connected with the tools through the flanging structures at the front edge and the rear edge by bolts;

(4) installing a blade root positioning tool at the root of the fan blade;

(5) and coating structural adhesive on the glass fiber reinforced plastic wedge-shaped strip area of the power increasing component suction surface shell, and connecting the power increasing component suction surface tool with the blade root positioning tool through a bolt. Heating at high temperature to solidify the structural adhesive;

(6) and disassembling the blade root positioning tool, coating structural adhesive on the bonding area of the power increasing component pressure surface shell, and then connecting and fixing the power increasing component pressure surface tool and the suction surface tool through bolts. Heating at high temperature to solidify the structural adhesive;

(7) and disassembling the tool for the suction surface and the pressure surface of the component, cutting the flanging structures of the front edge and the rear edge of the component, and polishing the components smoothly.

Drawings

All of the above features will be better understood from the following description taken in conjunction with the accompanying drawings, in which:

(1) fig. 1 is a schematic position diagram of a power increasing component at the root of a medium fan blade of the present invention, wherein 1 is a fan blade, and 2 is a power increasing component;

(2) fig. 2 is a schematic view of a medium wind turbine blade 1 of the present invention, wherein 11 is a blade root end surface, and 12 is a position of a maximum chord length of a blade root;

(3) fig. 3 is a schematic position diagram of the power increasing component 2 of the present invention, the power increasing component 2 is installed between the end surface 11 of the blade root and the maximum chord length position 12 of the blade root;

(4) fig. 4 is a schematic structural diagram of the power increasing component 2 of the present invention, the power increasing component 2 is composed of a pressure surface shell 22 and a suction surface shell 21, the appearance of the power increasing component is a pneumatic wing shape, and the pressure surface shell 22 and the suction surface shell 21 are bonded with the fan blade 1 as a whole through the structural adhesive 3;

(5) fig. 5 is a schematic structural diagram of the middle suction surface shell 21 of the present invention, wherein a is a leading edge flanging structure, B is a trailing edge flanging structure, 41 is a glass fiber reinforced plastic wedge-shaped strip, 42 is a foam, 43 is a glass fiber reinforced plastic outer skin, and 44 is a glass fiber reinforced plastic inner skin;

(6) fig. 6 is the installation process schematic diagram of the power increasing component 2 in the utility model, the suction surface shell 21 is connected with the suction surface tool 51 through the bolt 6, and the pressure surface shell 22 is connected with the pressure surface tool 52 through the bolt 6. The bolt positions are respectively positioned on the front edge flanging A and the rear edge flanging B;

(7) fig. 7 is a schematic view of the installation process of the middle suction surface shell 21 of the present invention, the blade root positioning tool 53 is fixed to the root of the fan blade 1, and then the blade root positioning tool 53 is connected to the suction surface tool 51 by the bolt 6 for positioning;

(8) fig. 8 is a schematic view of the installation process of the pressure surface housing 22 of the present invention, and the suction surface fixture 51 and the pressure surface fixture 52 are fixed by the bolt 6.

Detailed Description

The blade is the most main component for converting wind energy into kinetic energy in the wind driven generator, most of the appearance of the blade is airfoil-shaped, wherein the blade root is designed to be circular in order to increase the structural performance of the blade root and facilitate the connection of the blade with other components, so that the aerodynamic performance loss is large, and along with the reduction of wind speed of each wind power station caused by global warming, the aerodynamic loss of the blade root needs to be compensated by installing a power increasing component at the blade root, so that the blade can achieve the maximum efficiency under the condition of low wind speed.

The utility model relates to a fan blade 1's root increases merit part 2, its appearance is the pneumatic wing section, through will increase merit part 2 and install in fan blade 1's root, increases fan blade 1's root aerodynamic performance, realizes the promotion of fan generated energy.

The root end surface 11 of the fan blade 1 is circular, the maximum chord length 12 is airfoil-shaped, and a transition region is arranged between the root end surface 11 and the maximum chord length 12, and the transition region realizes the pneumatic and structural transition of the blade 1. In order to improve the aerodynamic performance of the root of the blade 1, the power increasing member 2 is installed between the blade root end surface 11 and the maximum chord length 12.

The power increasing component 2 consists of a pressure surface shell 22 and a suction surface shell 21, wherein the pressure surface shell 22 and the suction surface shell 21 are both of sandwich structures, each sandwich layer consists of two glass fiber reinforced plastic wedge-shaped strips 41 and foam 42, and the inner surface and the outer surface of each sandwich layer are respectively a glass fiber reinforced plastic inner skin 44 and a glass fiber reinforced plastic outer skin 43. The glass fiber reinforced plastic wedge-shaped strips 41 are positioned on two sides of the maximum thickness position of the pneumatic wing profile of the power increasing component 2, are bonded with the root of the fan blade 1 through structural adhesive 3, and are main stress structures for connecting the power increasing component 2 and the fan blade 1. The glass fibre direction in the glass fibre reinforced plastic wedge-shaped strips 41 is the same as the length direction of the blade 1, and the foam 42 is low density PVC foam.

Taking a certain 1.5MW fan blade as an example, the length of the blade is 40 meters, the length from the end surface 11 of the blade root to the position of the maximum chord length 12 is 7.5 meters, and the annual energy production of the fan can be increased by 2 percent by installing the power increasing component 2 with the length of 7.5 meters at the root part of the blade.

In order to realize increasing power part 2 and increase the root power of fan blade 1, the utility model discloses the production and the installation process of increasing power part 2 simultaneously:

(1) respectively manufacturing a pressure surface shell mold and a suction surface shell mold according to the shape of the power increasing component 2, and producing a pressure surface shell 22 and a suction surface shell 21;

(2) and sequentially laying outer skin glass fibers 43, glass fiber reinforced plastic wedge-shaped strips 41, foam 42 and inner skin glass fibers 44 in a shell mould of a pressure surface and a suction surface of the power increasing component 2, wherein the glass fiber reinforced plastic wedge-shaped strips 41 are positioned at the position with the largest thickness of the power increasing component 2. The pressure surface housing 22 and the suction surface housing 21 are respectively integrated by a resin vacuum infusion method. When the pressure surface shell 22 and the suction surface shell 21 are manufactured, the flanging structures of the front edge A and the rear edge B are reserved, the flanging structures are extensions of the inner skin glass fiber reinforced plastics 43 and the outer skin glass fiber reinforced plastics 44, and a space is reserved for installing the bolt 6;

(3) the pressure surface shell 22 and the suction surface shell 21 are respectively fixed with a pressure surface tool 52 and a suction surface tool 51, and are connected and fixed with the tools by bolts 6 through flanging structures of a front edge A and a rear edge B;

(4) installing a blade root positioning tool 53 at the root of the fan blade 1;

(5) the area of the glass fiber reinforced plastic wedge-shaped strip 41 of the suction surface shell 21 of the power increasing component 2 is coated with the structural adhesive 3, and then the suction surface tool 51 of the power increasing component 2 is connected with the blade root positioning tool 53 through the bolt 6. Heating at high temperature to solidify the structural adhesive 3;

(6) the blade root positioning tool 53 is disassembled, the structural adhesive 3 is coated on the bonding area of the power increasing component pressure surface shell 21, and then the power increasing component 2 pressure surface tool 52 and the suction surface tool 51 are fixedly connected through the bolts 3. Heating at high temperature to solidify the structural adhesive 3;

(7) and (5) disassembling the suction surface tool 51 and the pressure surface tool 52, cutting the flanging structures of the front edge A and the rear edge B of the component, and polishing smoothly.

Claims

1. The utility model provides an increase power increase part of fan blade root power which characterized in that, power increase part's appearance is the aerodynamic wing section, comprises pressure surface casing and suction surface casing, pressure surface casing and suction surface casing bond with fan blade root through the structure glue and become whole, wherein, power increase part's pressure surface casing and suction surface casing are sandwich structure, sandwich structure's inside and outside surface is glass steel covering, and the sandwich layer includes two glass steel wedge strips and foam.

2. The power increasing component as claimed in claim 1, wherein the power increasing component is arranged between the end face of the root part of the fan blade and the position of the maximum chord length of the blade, and the position of the maximum thickness of the aerodynamic airfoil of the power increasing component is connected with the root part of the fan blade.

3. The power increasing component of claim 1, wherein the two glass fiber reinforced plastic wedge-shaped strips are positioned at two sides of the position with the maximum thickness of the pneumatic wing profile of the power increasing component, are bonded with the root of the fan blade through structural adhesive and are main stress structures for connecting the power increasing component and the fan blade; the glass fiber in the glass fiber reinforced plastic wedge-shaped strip is consistent with the length direction of the blade, and the foam is low-density PVC foam, so that the integral rigidity of the component is increased.