A wind power blade pultrusion main beam integrated pouring process method

Abstract

A kind of wind power blade pultrusion main beam integrated perfusion process method, make resistance flow partition on the continuous felt below main beam, resistance flow partition is symmetrical relative to butt joint seam;Resistance flow adhesive tape is set on the guide net corresponding to pultrusion main beam area, main beam glue injection pipeline, resistance flow adhesive tape is set on the guide net above each pultrusion plate layer;Main beam glue injection pipeline is set between every two resistance flow adhesive tapes;Before perfusion, establish vacuum according to existing process requirements, connect pipeline;When perfusion, first open glue injection pipeline, each main beam glue injection pipeline is opened when resin front reaches the adjacent resistance flow adhesive tape on its front edge side, when pultrusion main beam area is all perfusion completed, close pipeline;After blade overall perfusion is completed, open heating program according to existing process requirements and heat curing to form the blade without pultrusion main beam interlayer defect.The wind power blade pultrusion main beam integrated perfusion scheme can be designed by the method of the application, which can eliminate pultrusion main beam interlayer glass fiber perfusion defects and improve pultrusion main beam interlayer fatigue performance.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of non-metal composite material processing and forming, and particularly relates to a wind turbine blade pultrusion main beam integrated pouring process method. BACKGROUND

[0002] Under the trend of large-scale development of wind turbine blades, in order to reduce the overall weight of the wind turbine blade and improve the stability of the mechanical properties of the main beam, the pultruded plate of the glass fiber main beam is currently stacked and assembled in the industry, and then integrated with the blade shell layer pouring forming process route. The existing pultrusion main beam generally uses a single-axis glass fiber pultrusion plate with a thickness of 5 mm and a width of 100-200 mm for stacking and assembling. In the width direction of the pultrusion main beam, 2-6 pultrusion plates are spliced, and in the thickness direction of the pultrusion main beam, 8-20 pultrusion plates are stacked, finally assembled into a wind turbine blade main beam. In order to ensure that the pultrusion plate layers can be attached, 200g / m 2 Bi-axial glass fiber cloth.

[0003] The current industry's pouring scheme for the pultrusion main beam region of the wind turbine blade is as shown in Figure 1 When the blade shell layer is laid, the main beam lower cloth layer 1, the main beam lower continuous felt 2, the pultrusion main beam 3, the shell core material 4, the flow guide net 5, the flow guide net partition 6, the glue injection pipe 7, and the VAP air bag 8 are sequentially laid on the main mold, and after the laying is completed, a vacuum is established. When the pultrusion main beam region is poured, the resin is preferentially injected from the glue injection pipe 7, and infiltrates along the flow guide net 6 to the leading edge on the upper surface of the pultrusion main beam 3, and infiltrates along the main beam lower continuous felt 2 to the leading edge on the lower surface of the pultrusion main beam 3. In the pultrusion plate layer of the pultrusion main beam 3, the resin infiltrates the glass fiber cloth between the pultrusion plate layers from the gap 10 between the pultrusion main beam 3 and the shell core material 4. Since the flow speed of the resin on the continuous felt 2 and the flow guide net 5 is much greater than the flow speed on the glass fiber cloth between the pultrusion plate layers, the resin on the upper and lower surfaces of the pultrusion main beam 3 will first flow into the pultrusion plate joint 9. At this time, the glass fiber cloth on the side of the joint 9 facing the trailing edge of the blade has not been completely infiltrated with resin, and the resin at the joint 9 surrounds the glass fiber cloth between the pultrusion plate layers A, B,..., N of the trailing edge, forming a pouring defect. There is currently no repair method for this defect, and the effect on the blade has not been verified in the wind field. The risk of failure between the pultrusion main beam layers is large, which reduces the stability of the operation of the wind turbine blade. SUMMARY

[0004] In order to solve the defect caused by the surrounding pouring of the glass fiber cloth between the pultrusion main beam layers, the present application proposes a wind turbine blade pultrusion main beam integrated pouring process method, which designs independent pouring schemes for each pultrusion plate layer of the pultrusion main beam, eliminates the pouring defect of the glass fiber cloth between the pultrusion main beam layers of the wind turbine blade, reduces the risk of failure between the pultrusion main beam layers, and improves the operation stability of the wind turbine blade.

[0005] The application aims at the following technical scheme. The application provides a wind power blade pultrusion main beam integrated pouring process method, which comprises the following steps: sequentially laying a main beam lower layer, a main beam lower continuous felt, a pultrusion main beam, a shell core material, a flow guide net and a glue injection pipeline on a mold according to an existing blade laying process, wherein the pultrusion main beam comprises pultrusion plate layers formed by stacking a plurality of pultrusion plates and glass fiber cloth between the layers, and the method further comprises the following steps.

[0006] A flow resistance partition is formed on the main beam lower continuous felt, and the flow resistance partition is located at a butt joint position of the first and second pultrusion plate layers at the trailing edge of the pultrusion main beam.

[0007] A flow resistance adhesive tape is arranged on the flow guide net corresponding to the pultrusion main beam region, and a main beam glue injection pipeline is arranged between every two flow resistance adhesive tapes.

[0008] Before pouring, a vacuum is established and a pipeline is connected according to existing process requirements.

[0009] During pouring, the glue injection pipeline is first opened, each main beam glue injection pipeline is opened when the resin front reaches the adjacent flow resistance adhesive tape on the leading edge side, and the pipeline is closed when the pultrusion main beam region is completely poured.

[0010] After the blade is completely poured, a heating program is started to heat and solidify according to existing process requirements, so as to form a blade without defects between the pultrusion main beam layers.

[0011] Further, the flow resistance partition is 50-150 mm wide.

[0012] Further, the flow resistance partition is symmetrical relative to the butt joint of the first and second pultrusion plate layers at the trailing edge of the pultrusion main beam.

[0013] Further, the flow resistance adhesive tape is a sealing tape with a thickness of 1-3 mm and a width of 10-20 mm.

[0014] Further, a plurality of flow resistance adhesive tapes are uniformly distributed in the infiltration direction during pouring of the pultrusion main beam, and the extension direction of the flow resistance adhesive tape is perpendicular to the infiltration direction.

[0015] Further, the main beam glue injection pipeline is a φ10-30 ohm pipeline or a spiral pipeline.

[0016] Further, the main beam glue injection pipeline is opposite to the corresponding butt joint position.

[0017] Compared with the prior art, the application has the advantages that: based on the prior art, the application designs a flow resistance tape and a main beam glue injection pipeline on each pultrusion plate layer area flow guide net of the pultrusion main beam, and a flow resistance partition is made at the side of the glue injection source of the main beam continuous felt, so that each pultrusion plate layer (A / B / … / N) of the pultrusion main beam is independently injected, the flow resistance tape exists on the flow guide net on the upper side of each pultrusion plate layer of the pultrusion main beam, and the resin source partition exists on the main beam continuous felt, the resin flow speed between the pultrusion plate layers is greater than the flow speed on the upper and lower sides of the pultrusion main beam during injection, the risk of surrounding the glass fiber cloth between each pultrusion plate layer when the resin flows through the butt joint of the pultrusion plate is solved, and the interlayer injection defect of the pultrusion main beam is completely eliminated.

[0018] The above description is only a summary of the technical scheme of the application, in order to more clearly understand the technical means of the application, and to be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a cross-sectional view of the existing wind power blade pultrusion main beam integrated injection process method.

[0020] Figure 2 It is a cross-sectional view of the embodiment of the wind power blade pultrusion main beam integrated injection process method of the application.

[0021] REFERENCE NUMERALS

[0022] 1-main beam lower cloth layer, 2-main beam continuous felt, 3-pultrusion main beam, 4-shell core material, 5-flow guide net, 6-flow guide net partition, 7-glue injection pipeline, 8-VAP air bag, 9-but joint, 10-gap, 11-flow resistance partition, 12-flow resistance tape, 13-main beam glue injection pipeline. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the application.

[0024] An embodiment of the wind power blade pultrusion main beam integrated injection process method of the application is shown in the following table. Figure 2As shown, when the blade shell layer is laid, the main beam lower layer 1, the main beam lower continuous felt 2, the flow blocking partition 11, the pultruded main beam 3, the shell core material 4, the flow guide net 5, the glue injection pipe 7, the flow blocking tape 12 and the main beam glue injection pipe 13 are laid on the main mold in sequence. The glue injection pipe 7 is close to the trailing edge of the wind power blade. The pultruded main beam 3 includes a plurality of spliced and stacked pultruded plates. The plurality of pultruded plates are stacked in the thickness direction to form a plurality of pultruded plate layers. The plurality of pultruded plate layers are respectively Figure 2 A, B, …, N in the width direction to form the pultruded main beam. The pultruded plates in the plurality of pultruded plate layers are spliced one by one. The glass cloth is arranged between the pultruded plates of the same height in the plurality of pultruded plate layers and the adjacent pultruded plates.

[0025] The flow blocking partition 11 is arranged on the main beam lower continuous felt 2 and below the butt joint 9 between the first and second pultruded plate layers of the trailing edge of the pultruded main beam 3 to slow down the flow rate of the resin during pouring. In the embodiment, the flow blocking partition 11 is symmetrical relative to the butt joint 9 between the first and second pultruded plate layers of the trailing edge of the pultruded main beam 3. The width of the flow blocking partition is 50-150 mm to further slow down the flow rate of the resin during pouring. The flow blocking tape 12 is arranged on the flow guide net above each pultruded plate layer, as shown by A, B, …, N. Figure 2 The flow blocking tape 12 is arranged on the flow guide net above each pultruded plate layer. In the embodiment, the plurality of flow blocking tapes 12 are uniformly distributed in the infiltration direction during pouring of the pultruded main beam 3. The infiltration direction is from the trailing edge to the leading edge of the wind power blade. The flow blocking tape 12 is a sealing tape with a thickness of 1-3 mm and a width of 10-20 mm. The extension direction of the flow blocking tape 12 is perpendicular to the infiltration direction to achieve better flow blocking effect. The main beam glue injection pipe 13 is arranged between every two flow blocking tapes 12. In the embodiment, the main beam glue injection pipe 13 is a φ10-30 ohm pipe or a spiral pipe. The main beam glue injection pipe 13 is opposite to the corresponding butt joint position. The resin quickly reaches the butt joint to achieve better pouring effect.

[0026] After the laying is completed, the vacuum is established. During pouring of the pultruded main beam 3 area, the resin is preferentially injected by the glue injection pipe 7. The resin infiltrates along the flow guide net 5 to the leading edge on the upper surface of the pultruded main beam 3. Each main beam glue injection pipe 13 starts to inject the resin when the resin reaches the adjacent flow blocking tape 12 on the leading edge side. That is, during pouring, after the resin passes through the corresponding butt joint of the main beam injection pipe 13 and reaches the flow blocking tape 12 on the leading edge side, the main beam glue injection pipe 13 starts to inject the glue to ensure that the defects in the pultruded plate layer are eliminated. The resin injection is stopped after the pultruded main beam 3 area is poured. After pouring is completed, the blade shell (half blade shell in the wind power blade) without defects between the pultruded main beam layers can be obtained after heating and curing according to the process requirements.

[0027] The key technology of the application is that, on the basis of the prior art, a flow resistance partition 11 is made at the resin source side of the lower continuous felt 2 of the main beam, a flow resistance adhesive tape 12 and a main beam resin injection pipe 13 are designed on the flow guide net 5 of each pultrusion plate area of the pultrusion main beam 3, so that each pultrusion plate (A / B / … / N) of the pultrusion main beam 3 is independently injected in a partitioned manner, the flow resistance adhesive tape 12 exists on the flow guide net 5 on the upper side of each pultrusion plate in the pultrusion main beam, and the resin source partition exists on the lower continuous felt 2 of the main beam. When injection is performed, the flow speed of the resin between the pultrusion plate layers is greater than the flow speed on the upper and lower sides of the pultrusion main beam 3, the risk of surrounding the interlayer glass fiber cloth of each pultrusion plate when the resin flows through the butt joint 9 of the pultrusion plate is solved, and the interlayer injection defect of the pultrusion main beam is completely eliminated.

[0028] The method of the application can eliminate the interlayer glass fiber injection defect of the pultrusion main beam and improve the interlayer fatigue performance of the pultrusion main beam.

[0029] The specific steps of an embodiment of the wind power blade pultrusion main beam integrated injection process method are as follows:

[0030] 1. According to the blade process, the main beam lower cloth layer 1, the main beam lower continuous felt 2, the pultrusion main beam 3, the shell core material 4, the flow guide net 5, and the resin injection pipe 7 are sequentially laid in the mold, wherein the flow resistance partition 11 is made on the main beam lower continuous felt 2, the flow resistance partition 11 is symmetrical relative to the butt joints of the first and second pultrusion plates at the rear edge of the pultrusion main beam, and the partition width is 50-150 mm.

[0031] 2. The flow resistance adhesive tape 12 and the main beam resin injection pipe 13 are arranged on the flow guide net 5 in the pultrusion main beam 3 area, the flow resistance adhesive tape is a sealing adhesive tape with a thickness of 1-3 mm and a width of 10-20 mm, the flow resistance adhesive tape 12 is arranged on the flow guide net above each pultrusion plate, and the main beam resin injection pipe 13 is a φ10-30 ohm pipe or a spiral pipe, and the main beam resin injection pipe 13 is arranged between every two flow resistance adhesive tapes 12.

[0032] 3. The vacuum is established and the pipeline is connected according to the process requirements.

[0033] 4. When injection is performed, the resin injection pipe 7 is first opened, each main beam resin injection pipe 13 is opened when the resin front reaches the adjacent flow resistance adhesive tape 12 on the front edge side, and the pipeline is closed when the main beam area is completely injected.

[0034] 5. After the whole blade injection is completed, the heating program is started according to the process requirements.

[0035] 6. After the curing is completed, the blade shell (half blade shell) without the pultrusion main beam interlayer defect is obtained.

[0036] While embodiments of the application have been shown and described, it is to be understood that the application is not limited to the details of the embodiments described, since numerous changes, modifications, substitutions and variations can be made thereto without departing from the spirit and scope of the application as defined by the appended claims and their equivalents.

Claims

1. A process for integrally infusing a wind turbine blade pultruded spar, comprising the steps of: According to the blade laying process, the main beam lower layer (1), the main beam lower continuous felt (2), the pultrusion main beam (3), the shell core material (4), the flow guide net (5) and the glue injection pipeline (7) are laid on the mold in sequence, the pultrusion main beam (3) includes a plurality of pultrusion plate layers stacked by a plurality of pultrusion plates and glass fiber cloth between the layers, and the method comprises the following steps: A flow resistance partition (11) is made on the main beam lower continuous felt (2), and the flow resistance partition (11) is located at the position of the butt joint (9) of the first and second pultrusion plate layers at the trailing edge of the pultrusion main beam; A flow resistance adhesive tape (12) and a main beam glue injection pipeline (13) are arranged on the flow guide net (5) corresponding to the pultrusion main beam (3) region, the flow resistance adhesive tape (12) is arranged above each pultrusion plate layer, and the main beam glue injection pipeline (13) is arranged between adjacent flow resistance adhesive tapes (12); Before pouring, a vacuum is established and a pipeline is connected according to process requirements; During pouring, the glue injection pipeline (7) is first opened, each main beam glue injection pipeline (13) is opened when the resin front reaches the adjacent flow resistance adhesive tape (12) on the leading edge side, and the pipeline is closed when the pultrusion main beam region is completely poured; After the whole blade is poured, a heating program is started according to process requirements.

2. The process of claim 1, wherein: The flow resistance partition (11) is 50-150 mm wide.

3. The process of claim 1, wherein: The flow resistance partition is symmetrical relative to the butt joint of the first and second pultrusion plate layers at the trailing edge of the pultrusion main beam.

4. The process of claim 1, wherein: The flow resistance adhesive tape (12) is a sealing tape with a thickness of 1-3 mm and a width of 10-20 mm.

5. The process of claim 1, wherein: A plurality of flow resistance adhesive tapes (12) are uniformly distributed in the infiltration direction of the pultrusion main beam (3) during pouring, and the extension direction of the flow resistance adhesive tape (12) is perpendicular to the infiltration direction.

6. The process of claim 1, wherein: The main beam glue injection pipeline (13) is a φ10-30 ohm pipe or a spiral pipe.

7. The process of claim 1, wherein: The main beam glue injection pipeline (13) is opposite to the corresponding butt joint (9) position.

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