CN209687654U - A kind of horizontal shaft wind-power blade blade root airbag structure - Google Patents

Abstract

The utility model provides a kind of horizontal shaft wind-power blade blade root airbag structure, by being glued the blade root air bag in thin plate-like outside the blade root of basic blade section, optimize the aerodynamic configuration of basic blade leaf root part, it avoids existing by simply pasting in basic blade to extend the problems such as structural strength caused by length of blade is low, stability is poor, under the premise of hardly increasing basic blade weight, the energy utilization efficiency of blade is improved, the real output of Wind turbines is increased.

Description

A horizontal axis wind turbine blade root airbag structure

technical field

The utility model belongs to the field of optimization and transformation of wind power generator blades, and relates to a blade root structure of a wind power blade, in particular to a blade root airbag structure of a horizontal axis wind power blade.

Background technique

Wind turbines mainly rely on wind turbine blades to capture wind energy, and the length of wind turbine blades directly affects the ability of wind turbines to capture wind energy and the output power of wind turbines. Increasing the length of wind turbine blades at low wind speeds can effectively increase the power generation of wind turbines. However, as the capacity of wind turbine assembly continues to increase, the blades become more slender, and under the action of various loads such as aerodynamic force and gravity, the blades will inevitably bend and twist. Such deformation seriously affects the performance of wind turbines, including the reduction of power generation efficiency and fatigue damage. Therefore, in order to ensure the safe and stable operation of the wind turbines, it is necessary to reduce the quality of the blades. In addition, the use of larger blades will greatly increase the construction cost and installation difficulty, and even more difficult is the transportation problem.

The cost of wind power blades accounts for about 15%-20% of the cost of the whole unit. If the overall replacement of the existing wind power blades is bound to increase the high cost of transformation and increase the cost of power generation, the overall replacement of blades is not conducive to improving the economics of wind turbine transformation . It is very important to design a wind turbine blade power booster device and implementation process with reliable structure and simple implementation to reduce the cost of transformation.

Most of the existing blade power boosters are blade tip extension technology, and a composite material shell is simply bonded on the basis of the existing blade structure to extend the length of the blade. This scheme is difficult to construct, the process is complicated, and the construction period long. If the design and process control are not perfect, it will easily lead to adverse effects such as poor structural strength and stability. And the most critical thing is that the quality of the blade cannot be effectively reduced. The technology of optimizing the shape of the blade root can also improve the energy utilization efficiency of the blade and increase the actual output power of the wind turbine, but it is rarely used at present, and the utility model is developed based on this.

Utility model content

(1) Technical problems to be solved

Aiming at the above-mentioned defects and deficiencies of the prior art, the utility model provides a root airbag structure of a horizontal axis wind power blade. By bonding a thin disk-shaped blade root airbag outside the root section of the basic blade, the basic blade is optimized. The aerodynamic shape of the blade root avoids the existing risks of low structural strength and poor stability caused by simply pasting on the base blade to extend the blade length, and improves the energy of the blade without increasing the weight of the base blade. Utilization efficiency increases the actual annual power generation of wind turbines.

(2) Technical solution

Before describing a solution to a problem, it is helpful to define some specific vocabulary.

The "reinforcement" mentioned in this utility model is generally used in the parts that cannot be involved in the conventional design of wind power blades, and is used to strengthen the strength deficiency that may be caused by local discontinuity or stress concentration of the structure.

The "span direction" mentioned in this utility model generally refers to the direction along the length of the wind power blade, from the blade root to the blade tip or from the blade tip to the blade root.

The "chord direction" mentioned in this utility model generally refers to the direction along the width of the wind power blade, from the leading edge of the blade to the trailing edge of the blade or from the trailing edge of the blade to the leading edge of the blade.

The "free end" mentioned in the present invention generally refers to the end of the corresponding structure or material, because there is no restriction on the direction of outward extension.

The technical scheme that the utility model takes for solving its technical problem is:

A blade root airbag structure of a horizontal axis wind power blade, comprising a base blade and a blade root airbag, characterized in that,

After the blade root airbag is inflated, it is in the shape of a thin disk as a whole, and after being deployed along the chord direction of the blade, it at least includes the front edge boundary area, the upper airfoil area and the lower airfoil area, wherein,

- the leading edge boundary region, the inner surface of which is bonded to the outer surface of the leading edge portion of the blade root region of the basic blade by structural glue, and respectively on the pressure surface and the blade root region of the basic blade The suction surface extends a certain distance to the trailing edge along the chord direction;

--The upper airfoil area includes the leading edge area of the upper airfoil, the middle area of the upper airfoil and the trailing edge area of the upper airfoil sequentially along the chord direction, wherein,

The inner surface of the leading edge region of the upper airfoil is completely bonded to the outer surface of the leading edge region of the pressure surface of the blade root region of the basic blade by structural glue, and transitions to the leading edge boundary region;

The inner surface of the middle region of the upper airfoil is completely bonded to the outer surface of the middle region of the pressure surface of the root region of the basic blade by structural glue;

A part of the inner surface of the trailing edge region of the upper airfoil is bonded to the outer surface of the trailing edge region of the pressure surface of the root region of the basic blade through structural glue, and the remaining part is bonded to the lower wing through structural glue. The corresponding part of the surface area is bonded;

The thickness of the middle region of the upper airfoil after inflation is greater than the thickness of the leading edge region of the upper airfoil and the trailing edge region of the upper airfoil, and the thickness gradually increases from the leading edge region of the upper airfoil to the middle region of the upper airfoil. Large, the thickness gradually decreases from the middle area of the upper airfoil to the trailing edge area of the upper airfoil;

--The lower airfoil area includes the leading edge area of the lower airfoil, the middle area of the lower airfoil and the trailing edge area of the lower airfoil sequentially along the chord direction, wherein,

The inner surface of the leading edge region of the lower airfoil is completely bonded to the outer surface of the leading edge region of the suction surface of the blade root region of the basic blade through structural glue, and transitions to the leading edge boundary region, and the The inflated thickness of the leading edge region of the lower wing is substantially the same as that of the boundary region of the leading edge;

The inner surface of the middle region of the lower airfoil is completely bonded to the outer surface of the middle region of the suction surface of the root region of the base blade by structural glue;

A part of the inner surface of the trailing edge region of the lower airfoil is bonded to the outer surface of the trailing edge region of the suction surface of the root region of the basic blade through structural glue, and the remaining part is bonded to the upper wing through structural glue. Corresponding part bonding in the area of the trailing edge of the face;

The thickness of the central region of the lower airfoil after inflation is greater than the thickness of the leading edge region of the lower airfoil and the trailing edge region of the lower airfoil, and the thickness gradually increases from the leading edge region of the lower airfoil to the central region of the lower airfoil. The thickness gradually decreases from the central region of the lower airfoil to the trailing edge region of the lower airfoil.

Further, the gas-filled thickness distributions in the boundary region of the leading edge are basically consistent.

Preferably, the blade root airbag further includes a root transition area and a tip transition area located at both ends in the spanwise direction, wherein the inner surfaces of the root transition area and the tip transition area are respectively bonded to the foundation by structural glue. The outer surfaces of the spanwise ends of the root region of the blade.

Preferably, at least the edges of the outer surface of the root region of the base blade and the inner surface of the root airbag are formed as high-roughness surfaces.

Further, the non-edge positions of the outer surface of the blade root region of the basic blade and the non-edge positions of the inner surface of the blade root airbag are formed as rough surfaces.

Further, the edge of the outer surface of the root region of the basic blade and the edge of the inner surface of the root airbag are both formed as toothed surfaces.

Preferably, after the basic blade and the blade root airbag are bonded, the bonded free end is reinforced.

Preferably, the blade root airbag further includes an airbag inflation port, and the airbag inflation port is arranged on the blade root side of the upper airfoil trailing edge area and/or the lower airfoil trailing edge area to control the inflation in the airbag quantity.

(3) Beneficial effects

It can be seen from the above technical solutions that, compared with the prior art, the blade root airbag structure of the wind power blade and its assembly method and the wind power blade including the structure of the utility model have at least one of the following beneficial effects:

(1) The connection structure between the basic blade and the blade root airbag is conducive to improving the stress concentration at the free end of the glue joint and improving the reliability of the blade glue joint structure;

(2) Optimize the shape of the root part of the basic blade, so as to avoid simple pasting on the basis of the original blade to extend the length of the blade, resulting in problems such as poor structural strength and stability;

(3) Reinforcing the gap at the trailing edge of the airbag and the glued free end, which is beneficial to prevent local cracking of the airbag;

(4) After the basic blade and the blade root airbag are bonded, the free end of the glued joint on the outside of the blade is reinforced, which is conducive to improving the problem of stress concentration at the free end of the glued joint;

(5) Under the premise of hardly increasing the weight of the basic blade, the energy utilization efficiency of the blade is improved, and the actual output power of the wind turbine is increased.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the wind power blade formed after the assembly of the basic blade and the blade root airbag structure of the present invention;

Fig. 2 is a schematic diagram of the blade root airbag deployed along the chord direction, wherein (a) is a top view, and (b) is a 0-0 cross-sectional view;

Fig. 3 is a schematic diagram of a basic blade, wherein (a) is a side view, and (b) is an A-A sectional view;

Fig. 4 is a schematic diagram of the blade root airbag only bonding on the suction surface of the basic blade, wherein (a) is a side view, and (b) is a B-B cross-sectional view;

Fig. 5 is a schematic diagram of the blade root airbag being folded in half along its leading edge region, wherein (a) is a side view, and (b) is a C-C cross-sectional view;

Fig. 6 is a schematic diagram when the blade root airbag is gradually bonded to the pressure surface of the basic blade, wherein (a) is a side view, and (b) is a D-D cross-sectional view;

Fig. 7 is a schematic diagram when the trailing edge of the blade root airbag is closed, wherein (a) is a side view, and (b) is an E-E cross-sectional view.

Detailed ways

In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. Certain embodiments of the present invention will be described more fully hereinafter with reference to the accompanying drawings, in which some but not all embodiments will be shown. Indeed, various embodiments of the invention may be embodied in many different forms and should not be construed as limited to these set forth embodiments; rather, these embodiments are provided so that this invention will satisfy applicable legal requirements.

As shown in Figure 1, the blade root airbag structure of the horizontal axis wind power blade of the present invention includes a base blade 10 and a blade root airbag 20, the blade root area of the base blade 10 includes a leading edge, a trailing edge, a pressure surface and a suction surface, the blade The root airbag 20 is conformally wrapped on the outside of the root area of the basic blade 10 by structural glue, so as to form a new shape of the root.

Specifically, as shown in Figure 2, the blade root airbag 20 is in the shape of a thin disk as a whole after being inflated, and after being deployed along the chord direction of the blade, it can be divided into the leading edge boundary area, the upper airfoil area, the lower airfoil area, and the transition area at both ends. Wait for 5 areas.

The leading edge boundary region 26, the inner surface of which is bonded to the outer surface of the leading edge portion of the blade root region of the base blade 10 by structural glue, and is respectively along the chord side of the pressure surface and the suction surface of the blade root region of the base blade 10. It extends a certain distance toward the trailing edge, and the overall distribution of the inflated thickness of the leading edge boundary region 26 is basically the same.

The upper airfoil area includes the upper airfoil leading edge area 23, the upper airfoil middle area 24, and the upper airfoil trailing edge area 25 along the chord direction, wherein the inner surface of the upper airfoil leading edge area 23 is completely bonded by structural glue On the outer surface of the leading edge region of the pressure surface of the blade root region of the basic blade 10, and transition to the leading edge boundary region 26, and the inflation thickness of the upper airfoil leading edge region 23 and the leading edge boundary region 26 is basically the same; the upper wing The inner surface of the middle region 24 of the surface is completely bonded to the outer surface of the middle region of the pressure surface of the blade root region of the base blade 10 by structural glue; a part of the inner surface of the upper airfoil trailing edge region 25 is bonded to the On the outer surface of the trailing edge region of the pressure surface in the root region of the basic blade 10 , the remaining part is bonded to the corresponding part of the lower airfoil region by structural glue.

The lower airfoil area includes the leading edge area 30 of the lower airfoil, the middle area 29 of the lower airfoil, and the trailing edge area 28 of the lower airfoil sequentially along the chord direction, wherein the leading edge area 30 of the lower airfoil has its inner surface completely bonded by structural adhesive On the outer surface of the leading edge region of the suction surface of the blade root region of the basic blade 10, and transition to the leading edge boundary region 26, and the inflation thickness of the lower airfoil leading edge region and the leading edge boundary region 26 is basically the same; the lower airfoil Central region 29, the inner surface of which is completely bonded to the outer surface of the central region of the suction surface of the root region of the base blade 10 by structural glue; the lower airfoil trailing edge region 28, a part of its inner surface is bonded by structural glue On the outer surface of the trailing edge region of the suction side of the blade root region of the basic blade 10, the remaining part is bonded to the corresponding part of the upper airfoil trailing edge region by structural glue.

Moreover, the thickness of the upper airfoil middle region 24 after inflation is greater than the thickness of the upper airfoil leading edge region 23 and the upper airfoil trailing edge region 25, and from the upper airfoil leading edge region 23 to the upper airfoil middle region 24, the thickness gradually increases, From the middle region 24 of the upper airfoil to the trailing edge region 25 of the upper airfoil, the thickness gradually decreases. Similarly, the thickness of the lower airfoil central region 29 after inflation is greater than the thickness of the lower airfoil leading edge region 30 and the lower airfoil trailing edge region 28, and from the lower airfoil leading edge region 30 to the lower airfoil central region 29, the thickness gradually increases. The thickness is gradually reduced from the middle region 29 of the lower airfoil to the trailing edge region 28 of the lower airfoil.

The transition regions at both ends include a tip transition region 21 and a root transition region 27, and the inner surfaces of the root transition region 21 and the tip transition region 27 are respectively bonded to the outer surfaces of the two spanwise ends of the root region of the basic blade 10 by structural glue. superior.

The blade root airbag 20 also includes an airbag inflation port 22, which is arranged on the blade root side of the upper airfoil trailing edge region 25 and/or the lower airfoil trailing edge region 28, to control the amount of air in the airbag.

It is worth noting that the three regions of the leading edge region 23 of the upper airfoil, the leading edge region 30 of the lower airfoil and the boundary region 26 of the leading edge are thinner than other regions after the blade root airbag 20 is filled with air, so as to facilitate the integration with the basic blade. 10 of the leading edge position fit.

In addition, in order to improve the stress concentration at the glued free end and ensure the reliability of the bonding of the blade root airbag 20, at least the edge of the outer surface of the blade root region of the basic blade 10 and the edge of the inner surface of the blade root airbag 20 are formed with high roughness The surface is preferably configured as a toothed surface. Further, the non-edge positions of the outer surface of the blade root region of the basic blade 10 and the non-edge positions of the inner surface of the blade root airbag 20 are formed as rough surfaces to ensure the bonding effect. After the basic blade 10 and the blade root airbag 20 are bonded, the free ends bonded everywhere are reinforced.

3-7 show various steps of installing the blade root airbag 20 to the base blade 10, and each step is assisted by combining cross-sectional views such as A-A, B-B, C-C, D-D, and E-E. In this embodiment, operations will be performed on the basis of the basic blade 10, and the connection structure between the basic blade 10 and the blade root airbag 20 can improve the reliability of the blade glued structure. The inner surface of the airbag 20 and the outer surface of the root region of the base blade 10, especially the edge region, are provided with a high-roughness surface, preferably a toothed surface, to improve the stress concentration at the glued free end. After the basic blade 10 and the blade root airbag 20 are bonded, the glued free end on the outer side of the blade is reinforced, which helps to improve the problem of stress concentration at the glued free end. In addition, the gap at the trailing edge of the airbag and the free end of the outer glue joint are reinforced to prevent local cracking of the blade structure.

The blade root airbag 20 is installed on the basic blade 10, specifically, the following steps can be followed:

Step a: Determine the shape of the blade root according to the power augmentation scheme of the blade root area of the basic blade, and then prepare the blade root airbag 20 according to the designed size and shape, and set the inner surface of the blade root airbag 20 as a rough surface, and make the inner surface The edge position is set as a high-roughness surface, preferably it is set as a toothed surface;

Step b: As shown in Figure 3, remove the paint on the outer surface of the root part of the basic blade 10, and roughen the surface, and perform cutting processing on the surface of the first and last ends of the bonding section to form a high-roughness surface, preferably set it as a toothed surface;

Step c: As shown in Fig. 4-7, first fill the root airbag 20 to about 80% of the air to ensure that the airbag has a roughly stable shape, and then apply structural glue on the outer surface of the root part of the basic blade 10, Attach the inner surface of the lower airfoil of the blade root airbag 20 to the suction surface of the blade root of the basic blade, fix it and wait for the structural glue to cure, and then fold the blade root airbag 20 in half along the boundary area of its leading edge to realize the blade root airbag 20 and The bonding of the pressure surface of the root part of the basic blade 10, and then the root airbag 20 is filled with air, and finally the trailing edge of the blade and the surrounding gaps are reinforced and bonded, so that the root airbag 20 and the basic blade 10 are closely connected.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present utility model in detail. It should be understood that the above descriptions are only specific embodiments of the present utility model and are not intended to limit the present invention. For the utility model, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model shall be included in the protection scope of the utility model.

Claims (8)

1. a kind of horizontal shaft wind-power blade blade root airbag structure, including basic blade and blade root air bag, which is characterized in that

Integrally it is in thin plate-like after the blade root air bag inflation, leading edge border region, upper limb is included at least after the tangential expansion of blade Face region and lower aerofoil region, wherein

-- the leading edge border region, inner surface are bonded in the leading edge potion of the base region of the basic blade by structure glue Point outer surface on, and respectively on the pressure face and suction surface of the base region of the basic blade along tangential to trailing edge direction Extend certain distance；

-- the top airfoil region, along tangential successively including upper limb leading edge region, top airfoil central region and top airfoil trailing edge Region, wherein

The upper limb leading edge region, inner surface are bonded in the pressure of the base region of the basic blade by structure glue completely On the outer surface of the front edge area in power face, and transit to the leading edge border region, and the upper limb leading edge region with it is described The inflation thickness of leading edge border region is essentially identical；

The top airfoil central region, inner surface are bonded in the pressure of the base region of the basic blade by structure glue completely On the outer surface of the central region in power face；

Top airfoil trailing edge region, a part of inner surface are bonded in the base region of the basic blade by structure glue Pressure face trailing edge region outer surface on, rest part is viscous by the corresponding part in structure glue and the lower aerofoil region Knot；

Thickness after the top airfoil central region inflation is greater than the thickness in the upper limb leading edge region, top airfoil trailing edge region Degree, and from the upper limb leading edge region to the top airfoil central region, thickness is gradually increased, from the top airfoil middle region Domain to top airfoil trailing edge region, thickness is gradually reduced；

-- the lower aerofoil region, along tangential successively including bottom wing leading edge region, lower aerofoil central region and lower aerofoil trailing edge Region, wherein

The bottom wing leading edge region, inner surface are bonded in the suction of the base region of the basic blade by structure glue completely On the outer surface of the front edge area in power face, and transit to the leading edge border region；

The lower aerofoil central region, inner surface are bonded in the suction of the base region of the basic blade by structure glue completely On the outer surface of the central region in power face；

Lower aerofoil trailing edge region, a part of inner surface are bonded in the base region of the basic blade by structure glue Suction surface trailing edge region outer surface on, rest part passes through the corresponding part of structure glue and top airfoil trailing edge region Bonding；

Thickness after the lower aerofoil central region inflation is greater than the thickness in the bottom wing leading edge region, lower aerofoil trailing edge region Degree, and from the bottom wing leading edge region to the lower aerofoil central region, thickness is gradually increased, from the lower aerofoil middle region Domain to lower aerofoil trailing edge region, thickness is gradually reduced.

2. horizontal shaft wind-power blade blade root airbag structure according to claim 1, which is characterized in that the leading edge watershed area The inflation thickness distribution in domain is almost the same.

3. horizontal shaft wind-power blade blade root airbag structure according to claim 1, which is characterized in that the blade root air bag is also The butt transitional region and tip transitional region to both ends are opened up including being located at it, wherein the butt transitional region, tip transition The inner surface in region by structure glue be bonded in respectively the basic blade base region exhibition on the outer surface at both ends.

4. horizontal shaft wind-power blade blade root airbag structure according to claim 1, which is characterized in that at least on the basis The edge of the edge of the base region outer surface of blade and the blade root air bag inner surface is all formed as high roughness surface.

5. horizontal shaft wind-power blade blade root airbag structure according to claim 1, which is characterized in that the basic blade The non-edge position of base region outer surface and the non-edge position of the blade root air bag inner surface are all formed as rough surface.

6. horizontal shaft wind-power blade blade root airbag structure according to claim 1, which is characterized in that the basic blade The edge of the inner surface of the edge of the outer surface of base region and the blade root air bag is all formed as toothed surfaces.

7. horizontal shaft wind-power blade blade root airbag structure according to claim 1, which is characterized in that the basic blade and After blade root air bag bonding, to splicing free end reinforcement.

8. horizontal shaft wind-power blade blade root airbag structure according to claim 1, which is characterized in that the blade root air bag is also Including air bag inflating port, the leaf in top airfoil trailing edge region and/or lower aerofoil trailing edge region is arranged in the air bag inflating port Root side.