CN115875188A - Blade spar cap, manufacturing method of blade spar cap, blade and wind power generating set - Google Patents

Abstract

The invention provides a blade spar cap, a manufacturing method of the blade spar cap, a blade and a wind generating set. The blade spar cap includes a plurality of reinforcement plates including a damping reinforcement plate including a reinforcement layer and a damping material. According to the invention, by introducing damping material into the blade spar cap, the damping performance can be better exerted while the blade load is carried.

Description

Blade spar cap, manufacturing method of blade spar cap, blade and wind power generating set

technical field

The invention relates to the technical field of wind power generation, in particular to a blade spar cap, a manufacturing method of the blade spar cap, a blade and a wind power generating set.

Background technique

With the development of large-scale and high-power wind turbines, wind turbine blades have also become longer and thinner, resulting in more complex external forces affecting the blades during operation, and more prone to harmful flutter problems In light cases, the blades of the wind turbine will be locked and shut down, resulting in a loss of power generation. In severe cases, serious accidents such as blade vibration fatigue fracture and tower sweeping will occur. Therefore, the damping performance of the blades can be improved to reduce the possible risk of flutter. Can not be ignored.

Damping materials can convert mechanical vibration energy into heat energy and consume it, thus playing the role of vibration reduction and noise reduction. Therefore, damping materials can be applied on fan blades to reduce the vibration of the blades. In the prior art, the damping material is bonded to the inside of the blade shell, which not only increases the weight of the blade and reduces the power generation efficiency, but also has limited vibration damping effect. In addition, with the continuous swing of the blade, there is a risk of the damping material falling off, and the reliability is low.

Contents of the invention

An object of the present invention is to provide a blade spar cap capable of better damping performance in the blade.

Another object of the present invention is to provide a blade spar cap that can improve the power generation efficiency of the wind turbine and improve the operating reliability of the blade.

Another object of the present invention is to provide a blade spar cap capable of balancing damping performance and mechanical strength modulus.

According to an aspect of the present invention, a blade spar cap is provided. The blade spar cap includes a plurality of reinforcement plates, the plurality of reinforcement plates include a damping reinforcement plate, and the damping reinforcement plate includes a reinforcement layer and a damping material.

Optionally, the damping material is impregnated in the reinforcement layer.

Optionally, the plurality of stiffeners further includes a non-damping stiffener comprising a reinforcing layer impregnated with resin.

Optionally, the reinforcement layer in the damping reinforcement board and the reinforcement layer in the non-damping reinforcement board are glass fibers and/or carbon fibers.

Optionally, in the width direction of the blade spar cap and/or in the thickness direction of the blade spar cap, the damping reinforcement plate and the non-damping reinforcement plate are arranged at intervals.

Optionally, the damping reinforcement board further includes inorganic cloth, and the inorganic cloth is bonded to both sides of the reinforcement layer of the damping reinforcement board through a resin film.

Optionally, the damping reinforced plate and the non-damping reinforced plate are pultruded plates.

Optionally, the blade spar cap further includes an inorganic cloth interposed between adjacent stiffeners.

Optionally, the damping material includes viscoelastic damping rubber and a vulcanizing agent.

Optionally, the damping material also includes reinforcing agent, plasticizer, antioxidant and coupling agent. The damping material includes 60-80 parts by weight of viscoelastic damping rubber, 10-20 parts by weight of reinforcing agent, 1-5 parts by weight of plasticizer, 5-10 parts by weight of antioxidant, 1-3 parts by weight of vulcanizing agent and 0.5-3 parts by weight of coupling agent.

Optionally, the reinforcement layer in the damping reinforcement board is glass fiber, and the reinforcement layer in the non-damping reinforcement board is carbon fiber.

According to another aspect of the present invention, there is provided a manufacturing method of a blade spar cap, the manufacturing method comprising: preparing a damping solution; dipping a reinforcement layer into the damping solution to prepare a damping reinforcement board; laying the damping reinforcement board.

Optionally, the step of preparing the damping material includes: preparing raw materials, the raw materials include 60-80 parts by weight of viscoelastic damping rubber, 10-20 parts by weight of reinforcing agent, 1-5 parts by weight of plasticizer, 5-10 parts by weight Antioxidant in parts by weight, vulcanizing agent in 1-3 parts by weight and coupling agent in 0.5-3 parts by weight; raw materials are prepared into flakes by using an open mill; and flakes are dissolved in an organic solvent.

Optionally, the step of preparing the damping reinforced board further includes: after dipping the reinforced layer into the damping solution, preforming the reinforced layer into a board; drying the board to remove the organic solvent; bonding the dried board on both sides Inorganic cloth coated with a thermosetting resin film; the plate after bonding the inorganic cloth is formed to make a damping enhanced board.

Optionally, the blade spar cap further includes a non-damping reinforcing plate, the non-damping reinforcing plate includes a reinforcing layer impregnated with resin, and in the step of laying the damping reinforcing plate, in the width direction and/or thickness direction of the blade spar cap, the interval Laying of damped and non-damped reinforced slabs.

Optionally, the manufacturing method further includes: inserting an inorganic cloth between adjacent reinforcement boards.

Optionally, the manufacturing method includes: pouring resin to make a prefabricated part of the blade spar cap.

According to another aspect of the present disclosure, there is provided a blade comprising a blade spar cap as described above.

According to another aspect of the present disclosure, there is provided a wind turbine comprising a blade as described above.

According to the present invention, by introducing the damping material into the spar cap of the blade, the damping performance can be better exerted while bearing the load of the blade.

According to the present invention, by impregnating the reinforcing layer with the damping material, not only the overall weight of the spar cap of the blade is reduced, the power generation efficiency of the fan is improved, but also the risk of falling off of the damping structure on the shell surface is effectively solved, and the operating reliability of the blade is improved.

According to the present invention, the balance between the damping performance and the mechanical strength modulus of the blade spar cap can be achieved by jointly including the damping reinforcement plate and the non-damping reinforcement plate. The invention realizes the balance of the damping performance and the mechanical strength modulus of the blade spar cap through different hybrid stacking modes of the damping pultrusion plate and the ordinary pultrusion plate.

According to the present invention, by using the pultrusion process to manufacture the damping reinforcement plate, continuous processing and molding can be realized, and the production efficiency and stability of the product are improved.

According to the present invention, the inorganic cloth is bonded to both sides of the reinforcement layer in the damping reinforcement plate through the resin film. On the one hand, the inorganic cloth is beneficial to resin perfusion and conduction; The elastic damping rubber uses a coupling agent for chemical bonding, which solves the matching problem between rubber and thermosetting resin.

The invention realizes the balance of the damping performance and the mechanical strength modulus of the blade spar cap through the different mixing modes of the damping pultrusion plate and the ordinary pultrusion plate.

Description of drawings

Through the following description of the embodiments in conjunction with the accompanying drawings, the above-mentioned and other objects and features of the present invention will become more clear, in the accompanying drawings:

Figure 1 is a chord-wise cross-sectional view of a blade according to an embodiment of the invention;

Figures 2 to 5 schematically illustrate the arrangement of stiffeners in the spar cap of the blade according to an embodiment of the present invention;

Fig. 6 is a flow chart of preparing a damping enhanced plate according to an embodiment of the present invention;

Fig. 7 is a schematic diagram of the recycling device in Fig. 6 .

Explanation of reference numerals: 20 is a blade, 21 is an upper casing, 22 is a lower casing, 23 is a blade spar cap, 24 is a web, 23R is a reinforcing plate, 1 is a drawing frame, 2 is a guiding device, 3 is a Dip tank, 4 is preforming mold, 5 is drying chamber, 6 is blower, 7 is exhaust device, 8 is recovery device, 81 is reflux condenser, 82 is condensation pipe, 83 is circulating cooling water, 83A is water inlet , 83B is the water outlet, 84 is the solvent collector, 9 is the guide roller, 10 is the inorganic cloth, 11 is the first pair of pressure rollers, 12 is the second pair of pressure rollers, 13 is the forming mold, 14 is the tractor, 15 is cutting device.

Detailed ways

Hereinafter, the blade spar cap, the manufacturing method of the blade spar cap, the blade and the wind power generating set according to the embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Blade spar cap

As shown in FIG. 1 , the blade 20 includes an upper shell 21 , a lower shell 22 , a blade spar cap 23 disposed in the upper shell 21 and the lower shell 22 , and a web 24 supporting the blade spar cap 23 . Next, the structure of the spar cap 23 will be described in detail.

According to an embodiment of the invention, the blade spar cap 23 may include a plurality of stiffeners 23R, which may include a damping stiffener, which may include a stiffening layer and a damping material.

As the core component of the blade bearing force, the blade spar cap requires high strength and modulus, and bears the main load of blade vibration. However, the main components of the blade spar cap are thermosetting resin and glass fiber or carbon fiber, both of which have very low damping loss factors and high rigidity. Or transformed, the blade spar cap will also have a large vibration amplitude, which is not conducive to the improvement of the blade damping performance.

In the present invention, by introducing damping material into the spar cap 23 of the blade, the damping performance can be better exerted while carrying the load of the blade. The damping material can absorb and transform the energy of vibration, which is used to offset the load and vibration of the blade, greatly reducing the problem of blade flutter.

According to an embodiment of the invention, the damping material may be impregnated in the reinforcement layer. In the prior art, the reinforcement layer is impregnated with resin, but in the present invention, the reinforcement layer is impregnated with damping material, which not only reduces the overall weight of the blade spar cap, improves the power generation efficiency of the fan, but also effectively solves the problem of the shell surface damping structure. The risk of shedding is reduced and the operational reliability of the blades is improved.

According to an embodiment of the present invention, the damping material impregnated with the reinforcing layer may include viscoelastic damping rubber and a vulcanizing agent. In addition, in order to enhance the mechanical properties, processing properties, aging properties, interfacial bonding properties, etc. of the viscoelastic damping rubber, the damping material can also include reinforcing agents, plasticizers, antioxidants and coupling agents.

Optionally, the viscoelastic damping rubber material may be at least one of nitrile rubber, neoprene rubber, styrene-butadiene rubber, butyl rubber, natural rubber, bromobutyl rubber, and acrylate rubber. Alternatively, the reinforcing agent may be carbon black. Optionally, the plasticizer may be at least one of stearic acid, paraffin oil, coal tar, and aromatic oil. Optionally, the antioxidant may be at least one of hindered phenolic antioxidant 1010, antioxidant 1076, phosphorus antioxidant 168, and thioether antioxidant 1520. Optionally, the vulcanizing agent may be sulfur, and the coupling agent is selected from at least one of silane coupling agents, titanate coupling agents, and aluminate coupling agents.

According to the embodiment of the present invention, by adding a vulcanizing agent to the viscoelastic damping rubber, the rubber molecular chain can undergo cross-linking reaction through high temperature and high pressure in the subsequent processing process, and the rubber molecule changes from a linear structure to a network structure. and toughness are greatly improved. By adding a reinforcing agent to the viscoelastic damping rubber, the strength of the viscoelastic damping rubber can be increased, so that the viscoelastic damping rubber has a certain strength and toughness as a blade damping material. The processability of rubber materials can be improved by adding plasticizers to viscoelastic damping rubber. By adding an antioxidant to the viscoelastic damping rubber, the aging resistance and processing performance of the rubber material can be improved. By adding a coupling agent to the viscoelastic damping rubber, the active functional groups on the surface of the rubber material can be increased to prepare for the subsequent chemical bonding of the rubber and the thermosetting resin to improve the interface bonding strength and interaction.

According to an embodiment of the present invention, the content of the viscoelastic damping rubber can be 60-80 parts by weight, the content of the vulcanizing agent can be 1-3 parts by weight, the content of the reinforcing agent can be 10-20 parts by weight, and the content of the plasticizer The content can be 1-5 parts by weight, the content of antioxidant can be 5-10 parts by weight, and the content of coupling agent can be 0.5-3 parts by weight.

Viscoelastic damping rubber is used as the basic material, and its content determines the basic performance of the damping material and the coordination and mixing effect with other additives. When the content of the viscoelastic damping rubber is lower than 60 parts by weight, the performance of the base material is likely to be insufficient; when the content of the viscoelastic damping rubber is higher than 80 parts by weight, the content of other additives is relatively small, and the performance improvement effect is reduced. The vulcanizing agent can cause the rubber molecular chain to undergo a crosslinking reaction, and the rubber molecule changes from a linear structure to a network structure, and a rubber material with mature properties is obtained. When the content of vulcanizing agent is less than 1 weight part, it is easy to cause insufficient cross-linking reaction and poor mechanical properties of the rubber; when the content of vulcanizing agent is higher than 3 parts by weight, it is easy to cause transition of cross-linking reaction and the strength of rubber material is too high , poor processing performance.

The reinforcing agent can increase the strength and toughness of the viscoelastic damping rubber. When the content of the reinforcing agent is less than 10 parts by weight, it is easy to cause insufficient reinforcing performance. When the content of the reinforcing agent is higher than 20 parts by weight, it is easy to cause Processing and mixing effects are reduced. Plasticizers can improve the fluidity and processability of damping rubber materials. When the content of plasticizers is less than 1 part by weight, it is easy to cause poor processability, high rubber viscosity, and large shear resistance. When plasticizers When the content of is higher than 5 parts by weight, it is easy to cause excessive fluidity, which is not conducive to maintaining a high mechanical strength of the material. Antioxidants can improve the aging resistance of rubber materials. When the content of antioxidants is lower than 5 parts by weight, it is easy to reduce the aging performance of materials and reduce the service life. When the content of antioxidants is higher than 10 parts by weight, it is easy to The processing and mixing effect is reduced under the condition that the aging performance is satisfied. The coupling agent can increase the surface activity of the rubber material, which is conducive to improving the subsequent interface bonding performance with other materials. When the content of the coupling agent is less than 0.5 parts by weight, it is easy to cause insufficient surface activity and poor interfacial bonding performance. When the content of the coupling agent When the amount is higher than 3 parts by weight, it is easy to cause excessive material dosage, and the coupling agent degrades and volatilizes during processing, which affects the mechanical strength of the final material.

According to an embodiment of the present invention, the damping reinforcement board may further include inorganic cloth, and the inorganic cloth may be bonded to both sides of the reinforcement layer through a resin film. By bonding the inorganic cloth on both sides of the reinforcement board, it is beneficial to resin infusion and conduction. In addition, through the coupling agent in the damping material, the surface of the viscoelastic damping rubber and the active functional groups on the surface of the thermosetting resin can undergo a crosslinking reaction. Therefore, the interface of the two-phase material is effectively bonded by chemical bonds, and the strength is greatly improved.

According to an embodiment of the present invention, the inorganic cloth may be a glass fiber plain weave mesh cloth with a grammage of 30-100 g/m ² . The resin film may be a thermosetting resin film. The thermosetting resin can be selected from at least one of epoxy resin, polyurethane resin, acrylate resin, vinyl ester resin and the like.

According to an embodiment of the present invention, the plurality of reinforcing plates 23R may also include a non-damping reinforcing plate, which may include a reinforcing layer impregnated with a resin. The present invention can realize the balance of the damping performance and the mechanical strength modulus of the blade spar cap 23 by jointly including the damping reinforcement plate and the non-damping reinforcement plate.

According to an embodiment of the present invention, in the width direction of the blade spar cap 23 , the damping reinforcement plate and the non-damping reinforcement plate may be arranged at intervals. According to an embodiment of the present invention, in the thickness direction of the blade spar cap 23 , the damping reinforcement plate and the non-damping reinforcement plate may be arranged at intervals. However, the damping reinforcement plate and the non-damping reinforcement plate may only be arranged at intervals in one of the width direction and the thickness direction of the blade spar cap 23 .

According to the present invention, "arrangement at intervals" can mean that the damping reinforced plates and the non-damping reinforced plates are arranged at regular intervals, or that the damping reinforced plates and the non-damping reinforced plates are arranged at irregular intervals. For example, the damping stiffeners and non-damping stiffeners may be spaced in a regular pattern of ABAB, AABBAABB, ABBABB, etc., or in an irregular pattern of ABBABA, etc.

In addition, according to an embodiment of the present invention, only one of a damping reinforcement plate and a non-damping reinforcement plate may be provided in the length direction of the blade spar cap 23 , but it is not limited thereto. For example, in the length direction of the blade spar cap 23, a damping reinforcement plate and a non-damping reinforcement plate may be provided at the same time.

According to an embodiment of the present invention, the reinforcing layer in the damping reinforced panel and the reinforcing layer in the non-damping reinforced panel may be glass fibers and/or carbon fibers. The reinforcement layer in the damping reinforced panel may be glass fiber or carbon fiber, or may be a mixture of glass fiber or carbon fiber, and the reinforcement layer in the non-damping reinforced panel may be glass fiber or carbon fiber, or may be a mixture of glass fiber or carbon fiber.

When the blade spar cap 23 includes a plurality of damping reinforcement plates and a plurality of non-damping reinforcement plates, the reinforcement layers in each damping reinforcement plate may be the same or different, and the reinforcement layers in each non-damping reinforcement plate may be the same or different, without special limit.

Figures 2 to 5 schematically illustrate the arrangement of stiffeners in the blade spar cap 23 according to an embodiment of the present invention. In addition, FIGS. 2 to 5 are views viewed from the root of the blade 20 toward the tip of the blade 20 .

In Fig. 2 to Fig. 5, DG represents the damping reinforced plate with glass fiber reinforced layer, DC represents the damped reinforced plate with carbon fiber reinforced layer, NG represents the non-damped reinforced plate with glass fiber reinforced layer, NC represents the reinforced layer with carbon fiber undamped stiffeners. In addition, in FIGS. 2 to 5 , the left and right directions represent the width direction of the spar cap 23 (corresponding to the chord direction of the blade 20 ), and the up and down directions represent the thickness direction of the spar cap 23 (corresponding to the thickness direction of the blade 20 ).

In FIG. 2 , DC and NC are alternately arranged in the width direction and the thickness direction of the blade spar cap 23 . In FIG. 3 , DG and NG are alternately arranged in the width direction and the thickness direction of the blade spar cap 23 . In FIG. 4 , in the width direction of the blade spar cap 23 , only DG is provided, while in the thickness direction of the blade spar cap 23 , DG and NC are alternately arranged. In FIG. 5 , in the width direction of the blade spar cap 23 , DC and NG are arranged alternately, and in the thickness direction of the blade spar cap 23 , two layers of DC and two layers of NG are alternately arranged.

In addition, in Fig. 2 to Fig. 5, along the length direction of the blade spar cap 23 (corresponding to the span direction of the blade 20), only the corresponding stiffeners in Fig. 2 to Fig. 5 can be provided, for example, the first Row and first column indicate that only DC is set in the length direction of the blade spar cap 23 .

It should be understood that the arrangement of damping and non-damping reinforcement plates described in FIGS. 2 to 5 is only an example. For example, in the width direction and thickness direction of the blade spar cap 23 in FIGS. 2 to 5 , the number of stiffeners may vary, and the arrangement of damping stiffeners and non-damping stiffeners may vary. In addition, along the length direction of the blade spar cap 23 , it is not limited to arranging only one type of reinforcement plate, but two or more types of reinforcement plates may be provided.

According to the embodiment of the present invention, the damping reinforcement plate and the non-damping reinforcement plate are mixed in different ways, and the loss of stiffness and modulus of the damping reinforcement plate is compensated by the non-damping reinforcement plate, and the damping performance and the mechanical strength modulus of the blade spar cap are realized. balance.

For example, for the current blades with a length of about 100 meters, the mechanical stiffness modulus (about 140 GPa) of ordinary carbon fiber non-damping reinforced plates (eg, pultruded plates) is much greater than the mechanical stiffness required by the design. Therefore, the combination of glass fiber damping reinforced plate (for example, pultruded plate) and ordinary carbon fiber non-damping reinforced plate can make up for the lack of stiffness and modulus of glass fiber damping reinforced plate, and the overall mechanical stiffness of the blade spar cap obtained The stiffness of the blade spar cap that can be higher than that of ordinary glass fiber non-damping reinforced plates (for example, pultruded plates) not only solves the problem of excess mechanical stiffness of carbon fiber non-damped reinforced plates (for example, pultruded plates) and glass fiber damped reinforced plates The problem of insufficient mechanical stiffness can be greatly improved at the same time as the damping performance of the blade spar cap.

According to an embodiment of the present invention, the damping reinforced plate and the non-damping reinforced plate may be pultruded plates manufactured by a pultrusion process. The invention realizes the continuous processing and forming of the damping reinforcement plate by utilizing the pultrusion process, thereby improving the production efficiency and stability of the product.

According to an embodiment of the present invention, the blade spar cap 23 may also include an inorganic cloth interposed between adjacent reinforcing plates. By inserting the inorganic cloth between the adjacent reinforcement boards, it is beneficial for resin infusion and conduction. According to an embodiment of the present invention, the inorganic cloth between adjacent reinforcement boards may be glass fiber plain weave mesh cloth with a grammage of 100-300 g/m ² .

According to an embodiment of the invention, after stacking of the damping and non-damping stiffening plates, a thermosetting resin may be vacuum infused to form a preform of the blade spar cap. Optionally, the damping reinforcement plate and the non-damping reinforcement plate can be stacked on the blade shell forming mold, and then the resin is poured together with the laminated skin for integral co-curing molding.

Manufacturing method of blade spar cap

Hereinafter, the manufacturing method of the blade spar cap will be described in detail, and for the sake of brevity and emphasis, the description overlapping with the above description will be omitted.

According to an embodiment of the present invention, the manufacturing method of the blade spar cap may include: preparing a damping solution; dipping the reinforcement layer into the damping solution to prepare a damping reinforcement board; laying the damping reinforcement board.

1. Prepare damping solution

First prepare the ingredients. The raw materials may include 60-80 parts by weight of viscoelastic damping rubber, 10-20 parts by weight of reinforcing agent, 1-5 parts by weight of plasticizer, 5-10 parts by weight of antioxidant, 1-3 parts by weight of vulcanizing agent and 0.5-3 parts by weight of coupling agent.

Then, the above-mentioned raw materials were prepared into flakes by using an open mill. As an example, the roller pitch of the open mill can be adjusted to 1mm-5mm, the temperature is 20°C-60°C, the viscoelastic damping rubber is repeatedly masticated and thinned through the open mill for 7-10 times, and reinforcing agents, plasticizers, After the antioxidant, continue to masticate Botong for 7-10 times, then add vulcanizing agent and coupling agent, continue to masticate Botong for 7-10 times until the surface of the material is smooth without spots, and then adjust the roller distance of the open mill to about 1mm next film.

Finally, the flakes are dissolved in an organic solvent to make a damping solution. As an example, the uniformly masticated composite viscoelastic damping rubber material can be cut into small pieces with scissors, and added to an organic solvent for dissolution. The volume ratio of the damping material to the organic solvent is 1:2-1:5. After dissolution, Damping solution, used as a sizing agent for the reinforcement layer in the subsequent pultrusion process. The organic solvent can be selected from one of 120# gasoline, tetrahydrofuran, and ethyl acetate.

2. Preparation of damping reinforcement plate

The steps of preparing the damping reinforced board include: dipping the reinforced layer into the damping solution; preforming the reinforced layer into a board; drying the board to remove the organic solvent; bonding a thermosetting resin film coated on both sides of the dried board Mesh cloth; the board after bonding the mesh cloth is shaped to make a damping reinforcement board.

Fig. 6 is a flow chart of preparing a damping enhanced plate according to an embodiment of the present invention, and Fig. 7 is a schematic diagram of the recycling device in Fig. 6 .

As shown in FIG. 6 , a reinforcing layer (for example, glass fiber or carbon fiber) can be placed on a drawing frame 1 and pulled out by a guiding device 2 .

The drawn glass fiber or carbon fiber is immersed in the dipping tank 3 . The damping solution prepared as above is contained in the dipping tank 3 as a sizing agent. Glass fibers or carbon fibers impregnate the sizing agent in the dipping tank 3 .

The glass fiber or carbon fiber impregnated with the damping solution passes through the preforming mold 4 to form the shape of the plate.

The preformed board passes through the drying chamber 5 to remove the organic solvent contained in the damping solution. There are several blowers 6 below the drying chamber 5, and the temperature of the air is controlled at 80-100°C.

By adjusting the blowing speed and temperature of the blower 6, the organic solvent content of the plate is controlled to <0.1% before leaving the drying chamber 5. The entire drying chamber 5 is kept airtight to prevent the leakage of organic solvent gas.

There is an exhaust device 7 above the drying chamber 5 to recover the volatilized organic solvent gas. Fig. 7 has shown the schematic diagram of recovery device 8, and air suction port connects a reflux condenser 81, and condensing pipe 82 is spiral downwards, passes into circulation cooling water 83 in the reflux condenser 81, and circulation cooling water 83 is from water inlet 83A It flows into the condenser 81 and flows out of the condenser 81 from the water outlet 83B to condense the organic solvent gas into liquid droplets and flow back to the solvent collector 84 .

Then, the preformed sheet after removing the solvent comes out of the drying chamber 5, and the upper and lower guide rollers 9 respectively compound two inorganic cloths (for example, glass fiber plain weave mesh cloth) 10 to the upper and lower sides of the preformed sheet, and the glass fiber plain weave The width of the mesh cloth is the same as that of the preformed sheet, and the side of the glass fiber plain weave mesh facing the preformed sheet has been pre-coated with a layer of uncured thermosetting resin film. Optionally, the thickness of the thermosetting resin film is 100 μm-500 μm. The first pair of pressing rollers 11 preliminarily bond the glass fiber plain mesh cloth to the preformed sheet, and the mesh cloth is used as a base material to bond the thermosetting resin to the damping pultrusion sheet. Optionally, the glass fiber plain weave grid cloth has a grammage of 30-100 g/m ² . The thermosetting resin can be selected from one of epoxy resin, polyurethane resin, acrylate resin, vinyl ester resin and the like.

Then, the preformed board compounded with inorganic cloth passes through the second counter-pressing roller 12, and the pressure exerted by the second counter-pressing roller 12 bonds the thermosetting resin to the upper and lower surfaces of the board, so that the damping glue and the thermosetting resin are combined more tightly. , At the same time, it can remove the air bubbles in the plate.

Next, the preformed board passes through the forming die 13 to form a damping reinforcement board. During the molding process, the viscoelastic damping rubber in the damping material is vulcanized, and the surface of the viscoelastic damping rubber and the active functional groups on the surface of the thermosetting resin undergo a crosslinking reaction through the coupling agent present in the damping material, so the interface of the two-phase material is combined The effective bonding is carried out through chemical bonds, and the strength is greatly improved. Optionally, the heating temperature of the molding die 13 may be 150-190° C., and the molding time may be 2 min-10 min.

Finally, the damping reinforcement plate is provided with traction by the tractor 14, and the damping reinforcement plate is pulled to the cutting device 15, and cut according to the actual length requirement.

3. Lay damping reinforcement board

The blade spar cap can also include a non-damping reinforcement plate, the manufacturing method of the non-damping reinforcement plate is similar to the manufacturing method of the above-mentioned damping reinforcement plate, the difference is that when manufacturing the non-damping reinforcement plate, a thermosetting resin is used as a sizing agent, that is, after dipping Tank 3 is filled with thermosetting resin instead of damping material. In addition, since the thermosetting resin does not contain organic components, the drying chamber does not need to be airtight and the recovery device 8 is also unnecessary.

When laying damping reinforced boards and non-damping reinforced boards, different mixed arrangements can be made according to design requirements (for example, as shown in Figures 2 to 5). In addition, inorganic cloth can be inserted between adjacent reinforcement boards to facilitate resin infusion and conduction. The inorganic cloth can be glass fiber plain weave mesh cloth with a grammage of 100-300g/m ² .

When required to form a preform for the spar cap, vacuum infusion of the thermosetting resin can be performed. The thermosetting infusion resin can be selected from one of epoxy resin, polyurethane resin, acrylate resin, vinyl ester resin and the like. Optionally, the vacuum infusion temperature is 20°C-80°C, and the infusion and curing time is 2h-6h.

However, it is also possible not to form a prefabricated part of the blade spar cap, but to stack the damping reinforcement plate and the non-damping reinforcement plate on the blade shell molding mold, and then pour resin together with the layup skin for integral co-curing molding.

concrete example

Prepare 72 parts by weight of nitrile rubber, 15 parts by weight of reinforcing carbon black, 3 parts by weight of stearic acid, 5 parts by weight of 1010 antioxidant, 3 parts by weight of sulfur and 2 parts by weight of silane coupling agent.

Adjust the roller distance of the open mill to 3mm and the temperature to 30°C. Repeat the plasticizing of the sticky nitrile rubber through the open mill for 10 times. After adding reinforcing carbon black, stearic acid and antioxidant 1010, continue to masticate the thin pass 10 times, then add sulfur and silane coupling agent, continue to masticate thin pass 10 times until the surface of the material is smooth without spots, and then adjust the roller distance of the open mill to about 1mm for the next sheet.

Finally, the uniformly masticated composite viscoelastic damping material was cut into small pieces with scissors, and added to 120# gasoline for dissolution. The volume ratio of damping material to gasoline solvent was 1:3. After dissolving, a damping solution is obtained, which is used as a sizing agent for the reinforcement layer in the subsequent pultrusion process.

The carbon fiber is placed on the drawer frame 1 and pulled out by the guide device 2, so that it enters the impregnation tank 3 to be impregnated with a sizing agent, the sizing agent being the damping material manufactured above.

The carbon fiber impregnated with the damping solution passes through the preforming mold 4 to form a preforming plate.

The preformed board passes through the drying chamber 5, and the blower 6 below the drying chamber 5 can remove the gasoline solvent contained in the preformed board, and the temperature of the controlled wind is at 100°C. By adjusting the blowing speed and temperature of the blower, the gasoline solvent content of the board before it leaves the drying chamber 5 reaches <0.1%.

The preformed board after solvent removal comes out of the drying chamber 5, and two glass fiber plain weave mesh cloths with a grammage of 50g/ ^m2 are compounded to the upper and lower sides of the preformed board by guide rollers 9. The fiberglass scrim is the same width as the preformed sheet. The side of the glass fiber plain weave grid facing the preformed sheet has been pre-coated with a layer of uncured epoxy resin film, and the thickness of the epoxy resin film is 200 μm. The first pair of pressure rollers 11 preliminarily bond the glass fiber plain weave mesh cloth to the damping plate, and the pressure exerted by the second pair of pressure rollers 12 bonds the epoxy resin to the upper and lower surfaces of the plate to combine the damping solution with the epoxy resin Tighter while removing air pockets present in the preformed sheet.

The preformed board passes through the molding die 13 to form a damping reinforcement board. The heating temperature of the molding die 13 is 180° C., and the time for the plate in the molding die 13 is controlled to be about 5 minutes.

The damping reinforcement plate is pulled to the cutting device 15 by the pulling machine 14, and cut according to the actual length requirement.

Arrange and stack the cut damping reinforcement boards with non-damping reinforcement boards (epoxy resin as a sizing agent) in a certain way according to the design requirements, and insert a glass fiber plain weave grid cloth with a grammage of 200g/ ^m2 between the reinforcement boards. Then vacuum infuse epoxy resin, the vacuum infusion temperature is 70°C, and the infusion and curing time is 4h. The preparation of the prefabricated part of the blade spar cap is completed by vacuum infusion and curing of epoxy resin.

blade

According to another embodiment of the present invention, a blade 20 including the above blade spar cap 23 may also be provided. The structure of the blade 20 has been described above with reference to FIG. 1 , and redundant description is omitted here.

Wind Turbine

According to another embodiment of the present invention, there may also be provided a wind power generator comprising the above-mentioned blade.

According to the present invention, by introducing the damping material into the spar cap of the blade, the damping performance can be better exerted while bearing the load of the blade.

According to the present invention, by impregnating the reinforcing layer with the damping material, not only the overall weight of the spar cap of the blade is reduced, the power generation efficiency of the fan is improved, but also the risk of falling off of the damping structure on the shell surface is effectively solved, and the operating reliability of the blade is improved.

According to the present invention, the balance between the damping performance and the mechanical strength modulus of the blade spar cap can be achieved by jointly including the damping reinforcement plate and the non-damping reinforcement plate. The invention realizes the balance of the damping performance and the mechanical strength modulus of the blade spar cap through different hybrid stacking modes of the damping pultrusion plate and the ordinary pultrusion plate.

According to the present invention, by using the pultrusion process to manufacture the damping reinforcement plate, continuous processing and molding can be realized, and the production efficiency and stability of the product are improved.

According to the present invention, the inorganic cloth is bonded to both sides of the reinforcement layer in the damping reinforcement plate through the resin film. On the one hand, the inorganic cloth is beneficial to resin perfusion and conduction; The elastic damping rubber uses a coupling agent for chemical bonding, which solves the matching problem between rubber and thermosetting resin.

The invention realizes the balance of the damping performance and the mechanical strength modulus of the blade spar cap through the different mixing modes of the damping pultrusion plate and the ordinary pultrusion plate.

Although the embodiments of the present invention have been described in detail above, those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the present invention. However, it should be understood that in the eyes of those skilled in the art, these modifications and variations will still fall within the spirit and scope of the embodiments of the present invention defined by the claims. In addition, the various embodiments described above can be combined with each other under the condition that they do not contradict each other.

Claims (19)

1. A blade spar cap wherein the blade spar cap (20) comprises a plurality of reinforcement plates (23R), said plurality of reinforcement plates (23R) comprising a damping reinforcement plate, said damping reinforcement plate comprising a reinforcement layer and a damping material.

2. The blade spar cap of claim 1, wherein the damping material is impregnated in the reinforcement layer.

3. The blade spar cap of claim 1, wherein the plurality of reinforcement plates (23R) further comprises a non-damped reinforcement plate comprising a reinforcement layer impregnated with a resin.

4. The blade spar cap of claim 3, wherein the reinforcement layers in the damped and non-damped reinforcement plates are fiberglass and/or carbon fibers.

5. The blade spar cap of claim 3, wherein the damped and non-damped reinforcement plates are arranged spaced apart in a width direction of the blade spar cap (23) and/or in a thickness direction of the blade spar cap (23).

6. The blade spar cap of any one of claims 1 to 5, wherein the damping reinforcing plate further comprises an inorganic cloth bonded to both sides of the reinforcing layer of the damping reinforcing plate through a resin film.

7. The blade spar cap of any one of claims 3 to 5, wherein the damped and undamped reinforcement plates are pultruded plates.

8. The blade spar cap of any of claims 1 to 5, wherein the blade spar cap (23) further comprises inorganic cloth interposed between adjacent reinforcement plates (23R).

9. The blade spar cap of any one of claims 1 to 5, wherein the damping material comprises a viscoelastic damping rubber and a vulcanizing agent.

10. The blade spar cap of claim 9 wherein the damping material further comprises a strengthening agent, a plasticizer, an antioxidant, and a coupling agent,

the damping material comprises 60-80 parts by weight of viscoelastic damping rubber, 10-20 parts by weight of reinforcing agent, 1-5 parts by weight of plasticizer, 5-10 parts by weight of antioxidant, 1-3 parts by weight of vulcanizing agent and 0.5-3 parts by weight of coupling agent.

11. The blade spar cap of claim 3, wherein the reinforcement layers in the damped reinforcement plates are fiberglass and the reinforcement layers in the non-damped reinforcement plates are carbon fibers.

12. A method of manufacturing a blade spar cap according to claim 1, comprising:

preparing a damping solution;

dipping the enhancement layer into a damping solution to prepare a damping enhancement plate;

and paving the damping reinforcing plate.

13. The method of manufacturing of claim 12, wherein the step of preparing the damping material comprises:

preparing raw materials, wherein the raw materials comprise 60-80 parts by weight of viscoelastic damping rubber, 10-20 parts by weight of reinforcing agent, 1-5 parts by weight of plasticizer, 5-10 parts by weight of antioxidant, 1-3 parts by weight of vulcanizing agent and 0.5-3 parts by weight of coupling agent;

preparing the raw materials into slices by using an open mill;

the flakes are dissolved in an organic solvent.

14. The manufacturing method according to claim 13, wherein the step of preparing the damping enhancing plate further comprises:

pre-forming the reinforcement layer into a sheet after dipping the reinforcement layer into the damping solution;

drying the plate to remove the organic solvent;

bonding inorganic cloth coated with thermosetting resin film on two sides of the dried board;

and forming the board after the inorganic cloth is bonded to form the damping reinforcing board.

15. The method of manufacturing according to any one of claims 12-14, wherein the blade spar cap further comprises a non-damped reinforcement plate comprising a reinforcement layer impregnated with a resin,

in the step of laying the damping reinforcing plates, the damping reinforcing plates and the non-damping reinforcing plates are laid at intervals in a width direction and/or a thickness direction of the blade spar cap.

16. The method of manufacturing according to claim 15, further comprising: inorganic cloth is interposed between adjacent reinforcing plates.

17. The manufacturing method according to claim 16, characterized by comprising: infusing resin to make a prefabricated member of the blade beam cap.

18. A blade, characterized in that the blade (20) comprises a blade spar cap (23) according to any of the claims 1-11.

19. A wind park according to claim 18, characterized in that the wind park comprises a blade (20).

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