CN201771696U - Integral blade of large scaled wind generating set - Google Patents

Abstract

The utility model provides an integral blade of a wind power generating set, the inner and outer fiber reinforced material layers of which are continuous without any cemented parts. There are shear webs and prefabricated spar caps inside the integral blade, and the shear webs and spar caps are fixed by fiber-reinforced matrix materials, which can improve the bearing capacity of the blade and shorten the manufacturing cycle of the blade; because the trailing edge of the blade is relatively It is narrow, and it is difficult to place the mandrel, so the trailing edge of the overall blade is placed at the trailing edge bonding angle that has been processed in advance. At the same time, because the overall blade does not use toxic structural adhesive bonding materials, environmental pollution and damage to the environment are reduced. Operator hazards are also reduced.

Description

A large-scale wind turbine integral blade

technical field

The utility model belongs to the field of wind power generation, in particular to an integral blade of a large composite material wind power generating set. the

Background technique

At present, the known large-scale composite material wind turbine blades adopt the vacuum-assisted forming (VARI) process to manufacture the windward side shell and the leeward side shell of the blade respectively, and apply structural glue on the leading edge and trailing edge of the shell. Bonded into a whole. In the middle of the two shells, there is usually a shear web. The number of shear webs is determined according to the structural design, and the connection between the shear web and the shell is also realized by bonding. The blades produced by this method have the following problems: there are differences in material properties between the bonding material and the fiber material, the bonding parts are prone to cracking, and the blades are prone to failure under heavy loads; The size of the bonding is not easy to control, which increases the difficulty of manufacturing; the quality of the blade is relatively heavy, the cost of raw materials is high, and the characteristics of the composite material are not fully utilized; during the bonding process of the upper and lower shells, the operator is exposed to the volatilization of toxic structural adhesives In the gas, it poses a threat to the health of the operator. the

Utility model content

In order to overcome the insufficient strength of existing blades, long production cycle, high production cost and threats to the health of operators, the utility model provides an integral blade, which is formed in a mold at one time, and the bearing capacity of the blade is improved without using bonding. The material not only avoids the impact of harmful gas on people and the environment, but also shortens the processing cycle of the blade and reduces the manufacturing cost of the blade. the

The technical solution adopted by the utility model to solve the above-mentioned technical problems is: an integral blade for wind power generation, including a blade shell and a shear web located in the middle of the blade shell. The blade shell consists of outer fiber layup, core, spar cap and inner fiber layup. The inner and outer fiber layers are continuous reinforcing fibers without cemented parts, which improves the strength of the blade. The beam cap and the sandwich core are placed between the inner and outer fiber layers in the same layer. In addition, the spar caps are lapped at both ends of the shear web via fiber layups. the

The length of the spar cap extends beyond the transverse length of the ends of the shear web. In addition, the above-mentioned integral blade for wind power generation also includes at least one said shear web, which is used to carry the blade shell, and the shear web is bonded to the blade shell through fiber layup, and the shear web is And the fiber layup is connected by impregnating the resin material to solidify, so that the shear web and the blade shell are integrated, and the bearing capacity of the blade is further improved. In addition, there can be one, two, three or more shear webs, and the number of shear webs can be determined according to the design requirements of the blade structure. the

Fiberglass or carbon fiber fabrics are used for inner and outer fiber layups. The impregnated resin material for the blade shell adopts unsaturated polyester resin, vinyl resin or epoxy resin material. the

The trailing edge bonding angle is pre-embedded at the trailing edge of the blade shell to ensure the geometry of the trailing edge of the blade, while reducing the difficulty of making the mandrel and making it easy to take out the mandrel after curing, which improves the manufacturing efficiency of the blade as a whole. the

The trailing edge bonding angle is made of balsa wood or PVC foam material, and its shape is determined by the geometry of the blade trailing edge, which can be a triangular structure. the

At the same time, the utility model adopts the vacuum-assisted forming process to prefabricate the shear web and the beam cap in advance, so as to shorten the time of glue injection in the blade manufacturing process, reduce the time occupied by the mold, and improve the production efficiency. the

The beneficial effect of the utility model is that the blade is molded in a mold at one time, while ensuring the strength and rigidity of the blade, no bonding material is used, the manufacturing time of the blade is shortened, and the manufacturing cost is reduced. the

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described. the

Fig. 1 is a schematic cross-sectional view of the blade structure at the present stage. the

Fig. 2 is a structural schematic view of the whole blade of the utility model. the

Fig. 3 is a schematic diagram of making the fiber layup on the windward side of the overall blade of the present invention. the

Fig. 4 is a schematic diagram of placement of the integral blade mandrel of the present invention. the

Fig. 5 is a schematic diagram of the fiber layup between the integral blade airbag and the mandrel of the present invention. the

Fig. 6 is a schematic diagram of making the leeward layer of the overall blade of the utility model. the

Fig. 7 is a schematic diagram of glue injection for the whole blade of the present invention. the

In the figure: 1. Shell on the windward side, 2. Shell on the leeward side, 3, 4. Shear web, 5. Structural glue on the leading edge, 6. Structural glue on the web, 7. Structural glue on the trailing edge, 8. Overall Shell on the windward side of the blade, 9. Spar cap on the windward side of the integral blade, 10. Shell on the leeward side of the integral blade, 11. Spar cap on the leeward side of the integral blade, 12, 13. Shear web, 14. Bonding angle of the trailing edge, 15, 16, 17. Web fiber layup, 18. Mold heating system, 19. Windward side mold, 20. External fiber layup, 21. Sandwich, 22. Internal fiber layup, 23. Adhesive suction at the front edge of the mold Groove, 24. Groove for glue outlet at the trailing edge of the mold, 25, 26, 27. Mandrel, 28. Leeward mold, 29. Glue injection equipment, 30. Glue suction equipment. the

Detailed ways

In Fig. 1, the known blades at this stage are mainly composed of the windward side shell 1 and the leeward side shell 2, and the shear webs 3 and 4, and the windward side shell 1 and the leeward side shell 2 are respectively used at the leading edge position The leading edge structural glue 5 is glued, and the trailing edge structural glue 7 is glued at the trailing edge position. At the same time, the upper and lower shells and the shear webs 3 and 4 are also glued and fixed by the web structural glue 6 . the

In the structural diagram of the integral blade shown in Figure 2, the shell 8 on the windward side of the integral blade contains a beam cap 9 on the windward side of the integral blade, and the shell 10 on the leeward side of the integral blade contains a spar cap 11 on the leeward side of the integral blade. The boards 12, 13 are laminated with the windward shell 8 of the integral blade and the leeward shell 10 of the integral blade through the fiber lay-ups 15, 16, 17, and are solidified and connected with the fiber lay-ups 15, 16, 17 after being impregnated with a resin material, and then It is integral with the windward side shell and the leeward side shell 8, 10 of the integral blade. There is a prefabricated trailing edge bonding angle 14 at the trailing edge of the overall blade, and the fiber layups at the trailing and trailing edges are laid continuously. The number of shear webs is determined according to the structural design requirements, and the number of shear webs can be one, two, or three or more. As shown in FIG. 1 , the lengths of the spar cap 9 on the windward side of the integral blade and the spar cap 11 on the leeward side of the integral blade are greater than the transverse lengths at both ends of the shear webs 12 and 13 . the

Fig. 3 shows the schematic diagram of making the fiber layup on the windward side of the integral blade. This is the first step in the manufacture of the integral blade. The outer fiber layup 20 is placed on the windward side mold 19 of the integral blade, and installed Mold heating system 18, wherein the fiber layup can be glass fiber or carbon fiber fabric; then, on the outer fiber layup 20, the sandwich core 21 and the windward side spar cap 9 are laid, and then the inner fiber layup 22 is laid. The trailing edge bonding angle 14 is placed on the right fiber layer of the windward side mold 19, and the trailing edge bonding angle 14 is processed in advance by using balsa wood or PVC foam material to ensure the strength of the blade at the trailing edge. As shown in FIG. 3 , the shape of the trailing edge bonding angle 14 is determined by the geometric design shape of the trailing edge of the blade, such as a triangular structure. The front edge of the mold 19 on the windward side is dug with a groove 23 for sucking glue at the front edge of the mold, which is used for inserting the glue into the injection pipe for the later blades, and finally the redundant fiber layup is placed on both sides of the mold 19 on the windward side. the

In the schematic diagram of the overall blade mandrel placement in Figure 4, after the fiber layup on the windward side is fabricated, the shear webs 12 and 13 prefabricated by the vacuum-assisted forming process are placed on the inner fiber layup 22 to resist shearing. The positioning of the webs 12, 13 is realized by mandrels 25, 26, 27. The mandrels 25, 26, 27 are made of soft materials and can withstand a certain pressure, because the outer surface of the mandrel is used to ensure the geometric dimensions of the inner cavity of the blade. It is necessary to ensure that excessive deformation will not occur after the leeward side is laid, and the mandrel 25, 26, 27 can be compressed simultaneously, so as to ensure that the mandrel 25, 26, 27 can be taken out smoothly after the blade glue is injected and solidified. the

Figure 5 is a schematic view of the fiber layup between the integral blade airbag and the mandrel. The web fiber layup 15, 16 and 17 fit the shear webs 12 and 13, and there are redundant parts at the upper and lower ends. Part rides on the mandrel 25,26,27. the

In the schematic diagram of the production of the overall blade leeward side layup in Figure 6, the original excess fiber layup on both sides of the windward side mold 19 is placed on the mandrel 25, 27, and the inner fiber layup 22 is first folded back to the mandrel 25 , 27, then lay the sandwich core 21, place the overall blade leeward spar cap 11, and finally fold back the outer fiber layup 20. the

Figure 7 is a schematic diagram of glue injection for the overall blade. After the leeward side layup is finished, the leeward side mold 28 is fastened to the windward side mold 19, and the mold is turned 90° counterclockwise as a whole. The groove 23 is inserted with a glue injection pipe and communicated with the glue injection equipment 29, and the groove 24 for glue outlet at the trailing edge of the mold is communicated with the glue suction equipment 30. Vacuumize the molds 28 and 19 on the leeward side and the windward side, inject the mixed liquid of resin and curing agent into the windward side and the leeward side layup, and the resin material can be unsaturated polyester resin, vinyl resin or epoxy resin. Under the effect of internal and external pressure difference, the liquid permeates the entire layer from bottom to top; after the mixed liquid flows into the glue suction device 30, the injection of glue is stopped; the mixed liquid is heated by the mold heating system 18, and waits for curing and forming. Finally, the mold is opened, and the core molds 25, 26, 27 in the blade and the inner cavity are taken out after demoulding to form a whole blade. the

This article only describes the preferred implementation of the utility model, but for those skilled in the art, various improvements can be made to the utility model without departing from the spirit of the utility model. Therefore, the utility model is not limited to the preferred embodiments described above, and its protection scope is defined by the appended claims. the

Claims (9)

1. An integral blade for a wind power generator, comprising a blade shell and a shear web positioned at the middle of the blade shell, characterized in that the blade shell includes an outer fiber layup, a sandwich core, a spar cap and an inner fiber layup, the inner and outer fiber layups are continuous reinforcing fibers without glue joints, the spar caps are lapped at both ends of the shear web through the fiber layups, and are located on the same layer as the interlayer between the inner and outer fiber between layers. 2. The integral blade of claim 1, wherein the spar cap extends beyond the shear web. 3. The integral blade according to claim 1, characterized in that it comprises at least one said shear web for carrying said blade shell, said shear web is bonded to said blade shell through fiber layup Considerate fit. 4. A monolithic blade according to claim 3, the shear web and the fiber layup being joined by impregnation with a resin material and curing. 5. The integral blade according to claim 1, wherein the inner and outer fiber layers are made of glass fiber or carbon fiber fabric. 6 . The integral blade according to claim 1 , wherein the resin material for impregnation of the blade shell is made of unsaturated polyester resin, vinyl resin or epoxy resin material. 7. The integral blade according to claim 1, characterized in that, a trailing edge bonding angle is buried at the trailing edge of the blade shell. 8. The integral blade according to claim 7, wherein the trailing edge bonding angle is made of balsa wood or PVC foam material. 9. The integral blade according to claim 7, wherein the trailing edge bonding corner is triangular in structure. the

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