A method for eliminating balsa gas filament defects in a vane and a vane

Abstract

The present application relates to the field of wind power generation, and discloses a kind of blade infusion balsa gas wire defect elimination method and blade, comprising: S1: balsa processing process, add a certain amount of sealing agent on the surface of balsa and select a certain slot width and cut through balsa processing;S2: baking treatment, balsa is baked, and balsa is rolled up and placed in the drying room, at a set temperature for a set time;S3: laying process, continuous felt is arranged in the middle region of mold surface, a layer of release cloth is added between continuous felt and skin, and VAP film is laid in the edge region of blade;S4: infusion is completed, the part of balsa surface temperature higher than the set temperature is sprayed with water cooling, to reduce the precipitation of water in balsa.The present application optimizes drying, slotting, chemical treatment and infusion process, significantly reduces the moisture content of balsa and gas residue, and improves the surface quality and stability of wind turbine blade.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wind power generation, in particular to a blade infusion balsa gas filament defect elimination method and a blade. BACKGROUND

[0002] In the fine manufacturing process of wind turbine blades, the structural strength requirements of the blades are increasingly stringent. Balsa, with a density ranging from 100 to 150 kg / m³, has excellent mechanical strength and modulus, far exceeding the performance of various types of foam materials. Balsa can maintain stable physical properties within a very wide temperature range (-212℃ to 163℃), and its unique honeycomb structure gives it unique advantages in the field of structural sandwich materials, making it an ideal choice for making wind turbine blade sandwich materials.

[0003] However, in the key link of main molding infusion, the balsa surface area of the blade and the core material groove often encounter defects such as gas filaments and bubbles. These defects, like invisible cracks, not only erode the overall quality of the blade, but also weaken its strength, posing a potential threat to the stable operation of the wind turbine.

[0004] In the face of this challenge, current technology mainly focuses on trying to alleviate the gas filament problem by fine-tuning the moisture content of balsa. Unfortunately, this method has not been able to effectively and completely solve this problem, and we still need to continue to explore more efficient and comprehensive solutions. SUMMARY

[0005] In view of the above technical deficiencies, the technical problem to be solved by the present application is to provide a blade infusion balsa gas filament defect elimination method and a blade, aiming to solve the problem of gas filaments, bubbles and other defects often encountered in the key link of main molding infusion in the balsa surface area of the blade and the core material groove.

[0006] To solve the above technical problems, the present application adopts the following technical solutions: The present application provides a blade infusion balsa gas filament defect elimination method, comprising: S1: balsa processing, adding a certain amount of pore sealing agent to the surface of balsa and selecting a certain groove width and cutting through to process balsa;

[0007] S2: baking treatment, baking treatment of balsa, wherein the balsa is rolled up and placed in an oven at a set temperature for a set time;

[0008] S3: laying process, arranging a continuous felt in the middle region of the mold profile, adding a layer of release cloth between the continuous felt and the skin, and laying a VAP film in the edge region of the blade;

[0009] Wherein, before laying the balsa, the mold is preheated to a set temperature until the laying is completed;

[0010] S4: After the perfusion is completed, spray water on the part of the balsa wood surface whose temperature is higher than the set temperature to reduce the release of moisture in the balsa wood.

[0011] Further, the balsa wood is rolled up and placed in an oven, and is baked at a temperature greater than 85°C for at least 10 hours.

[0012] Further, the baking is also performed in a high-temperature environment where the remaining temperature meets the set temperature.

[0013] Further, the baking is also performed after the balsa wood layers are separated.

[0014] Further, 18-20 g / m2 of a pore sealing agent is added to the surface of the balsa wood, and the balsa wood is processed by selecting a slot width of 0.1-0.5 mm and cutting through.

[0015] Further, the mold is preheated to a set temperature, and at the same time, the temperature of the balsa wood area is maintained by covering the balsa wood area with thermal insulation cotton, and the air in the mold is intermittently pumped out by an external steel wire tube.

[0016] Further, the VAP film laid in the edge area of the blade exceeds the defect area by 30-50 mm, and every interval set distance is provided with a 200 mm wide air exhaust ear, the air exhaust ear cavity is overlapped with the VAP film, and the trailing edge side is laid on the flow guide net of the flange platform, which is used to increase the power of air exhaust after resin covering in the air wire area, so as to improve the balsa wood air wire.

[0017] Further, the mold is preheated to 45°C before the balsa wood is laid to reduce the risk of moisture absorption of the balsa wood due to temperature difference.

[0018] Further, it also includes: taking out the balsa wood from the baking oven or directly placing the balsa wood taken out from the baking oven in a vacuum negative pressure environment for cooling.

[0019] A blade is made by using a blade perfusion balsa wood air wire defect elimination method.

[0020] The beneficial effects of the present application are:

[0021] 1. By controlling the balsa wood placement method, oven temperature and baking time, the water content of the balsa wood is controlled to be the lowest.

[0022] 2. By controlling the slot width and depth of the balsa wood, the molecular force between the bubbles and the balsa wood slots is weakened, and the residual gas in the perfusion process is reduced.

[0023] 3. By adding an appropriate amount of chemicals to the surface of the balsa wood, the problem of explosive polymerization caused by the penetration of the perfusion resin into the balsa wood structure and the perfusion process is solved.

[0024] 4, outside the skin, laid a layer of continuous felt or VAP film, can guide the water vapor to the continuous felt or VAP film on the infusion process, and eliminate the problem of glass fiber cloth layer balsa gas.

[0025] 5, open the mold 45℃ preheating in advance, cover the insulation cotton in the balsa area to improve the temperature of balsa area, while the external steel wire pipe intermittent switch back to the effective prevention of balsa due to moisture absorption of water content problem.

[0026] 6, after the infusion is completed, the local resin top glue can prevent the formation of explosive polymerization, reduce the degree of explosive polymerization, while the temperature of balsa surface is not higher than 45℃, the high temperature area is sprinkled with water to reduce the release of water in balsa. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0028] Figure 1 A leaf blade infusion balsa gas defect elimination method process provided by the embodiment of the present application. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0030] Embodiment 1

[0031] As shown in the figure, the present embodiment provides a kind of blade infusion balsa gas defect elimination method, comprising: Figure 1

[0032] S1: balsa processing, add 18-20g / ㎡ sealing agent on the surface of balsa and select 0.1-0.5mm slot width and cut through balsa processing. It should be noted that:

[0033] ​The appropriate slot width and slot depth can weaken the surface tension formed between the gas and the core material in the slot, thereby facilitating the discharge of the gas during the infusion process; during the production of balsa wood, by adding an appropriate amount of chemicals, on the one hand, the microporous structure in the balsa wood structure can be effectively filled, and water vapor accumulation can be avoided, on the other hand, the infusion of the resin into the balsa wood can be effectively blocked during the infusion, thereby avoiding the formation of balsa wood explosion due to abnormally high temperature.

[0034] S2: baking treatment, the balsa wood is placed in the oven and baked at a set temperature for a set time. It should be noted that:

[0035] The balsa wood is placed in the oven after being rolled up or separated layer by layer, and is baked at a temperature greater than 85°C for at least 10 hours.

[0036] Different placement of balsa wood will cause different evaporation rates of water during baking. After removing all the cartons and films, the balsa wood board is rolled up and baked. The water removal quality of the balsa wood board rolled up for baking is much higher than that of the balsa wood board laid flat. When baking the balsa wood, the surface baking temperature of the balsa wood is measured to be greater than 85°C, and the duration is greater than 10h, which can effectively remove the water in the thick balsa wood.

[0037] The mold is preheated to a set temperature, and at the same time, the balsa wood area is covered with thermal insulation cotton to maintain the temperature of the balsa wood area, and the air in the mold is intermittently pumped out through an external steel wire tube.

[0038] S3: laying process, arranging continuous felt in the middle area of the mold profile, adding a layer of release cloth between the continuous felt and the skin, and laying VAP film in the edge area of the blade; wherein, before laying the balsa wood, the mold is preheated to 45°C until the laying is completed, in order to reduce the risk of moisture absorption of the balsa wood due to temperature difference; at the same time, the balsa wood is taken out from the oven or directly placed in a vacuum negative pressure environment for cooling half an hour before laying. It should be noted that:

[0039] For the area in the middle of the mold profile where VAP film cannot be arranged, the three-dimensional porous structure of continuous felt or surface felt or other porous gas guiding materials is used, the continuous felt is placed outside the skin, a layer of release cloth is added between the continuous felt and the skin, the gas produced by the balsa wood during the infusion and solidification exothermic peak process is guided into the porous structure of the continuous felt through the enrichment effect of the continuous felt; after solidification, the continuous felt is torn off to eliminate the balsa wood gas filaments in the skin cloth layer; for the edge area of the blade, VAP film can be laid, the laying width of VAP film is determined according to the gas filament defect area, each VAP film exceeds the defect area by 30-50mm, an air exhaust ear 200mm wide is laid every 4m in the chord direction, the air exhaust ear cavity is lapped with the VAP film, and the trailing edge side is laid on the flow guide net on the flange platform, which is used to increase the power of air exhaust after resin covering in the gas filament area, thereby improving the balsa wood gas filament.

[0040] Preferably, during the light wood laying operation, the light wood baked for a long time at high temperature is in a super-dry state. The light wood is easily affected by the high humidity environment and absorbs moisture. Therefore, the light wood is taken out from the baking room half an hour before laying, or the taken-out light wood is placed in a vacuum negative pressure state for cooling to reduce moisture absorption. The mold is preheated to 45℃ before laying the light wood to further reduce the moisture absorption caused by the sudden change of the temperature of the light wood.

[0041] S4: After the pouring is completed, the part of the light wood surface with a temperature higher than the set temperature is sprayed with water to reduce the evaporation of water in the light wood. It should be noted that:

[0042] The light wood gas filament problem caused by the light wood gelatinization during the pouring process can be solved by pouring resin locally on the surface of the light wood after the pouring of the resin on the large surface of the shell is completed, so as to remove the gas filament on the surface of the light wood. After the vacuum is sealed, the water in the light wood is in a low-pressure state, and the boiling point is relatively low. During the pouring and curing process, the temperature of the light wood is detected by a temperature measuring device, and the light wood surface with a temperature higher than 45℃ is sprayed with water to reduce the temperature, so as to avoid the evaporation of water in the light wood.

[0043] Example 2

[0044] Based on the light wood being rolled up or being placed in the baking room after being separated layer by layer in Example 1, another light wood baking method is provided in this embodiment, that is, in addition to the special baking room, other high-temperature links in the process of manufacturing the blade, such as the post-curing process of the blade, can be used to complete the baking of the light wood, so as to achieve the purpose of removing water.

[0045] Example 3

[0046] Based on Example 1, this embodiment further provides a blade made by using a light wood gas filament defect elimination method based on a blade.

[0047] The above are only preferred embodiments of the present application and are not used to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacements to some technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method of eliminating balsa gas filament defects in a vane perfusion, characterized by, Comprising: S1: balsa processing, adding a certain amount of sealing agent on the surface of balsa and selecting a certain slot width and cutting through the balsa; S2: baking treatment, baking treatment is carried out on the balsa, wherein the balsa is rolled up and placed in the oven, and the temperature is kept at a certain temperature for a certain time; S3: laying process, arranging continuous felt in the middle region of the mold profile, adding a layer of release cloth between the continuous felt and the skin, and laying VAP film in the edge region of the blade; Wherein, the mold is preheated to a certain temperature before the balsa is laid until the laying is completed; S4: filling completion, spraying water on the part of the balsa surface whose temperature is higher than the set temperature to reduce the outgassing of water in the balsa; The balsa is rolled up and placed in the oven, and the temperature is kept at more than 85℃ for at least 10 hours; Also including baking after separating the layers of balsa; Adding 18-20g / ㎡ sealing agent on the surface of balsa and selecting 0.1-0.5mm slot width and cutting through the balsa; After preheating the mold to a certain temperature, cover the balsa area with thermal insulation cotton to keep the temperature of the balsa area, and connect the steel wire tube to the mold to intermittently pump out the air in the mold; The VAP film laid in the edge region of the blade exceeds the defect area by 30-50mm, and a 200mm wide air exhaust ear is set every certain distance, which is overlapped with the VAP film in the air exhaust ear cavity, and the trailing edge side is laid on the flow guide net on the flange platform, which is used to increase the power of air exhaust after resin covering in the air wire area to improve the balsa air wire.

2. The blade infusion balsa air wire defect elimination method of claim 1, further comprising baking in a high temperature environment that meets the set temperature.

3. The blade infusion balsa air wire defect elimination method of claim 1, wherein, before laying the balsa, the mold is preheated to 45℃ to reduce the risk of moisture absorption of the balsa due to temperature difference. Further comprising: Taking the balsa out of the baking oven half an hour before laying or directly placing the balsa taken out of the baking oven in a vacuum negative pressure environment for cooling.

4. A method of eliminating defects in a vane-impregnated balsa gas filament as defined in claim 1, wherein The blade is made by the blade infusion balsa air wire defect elimination method of any one of claims 1 to 4. ​ 5. A blade, characterized in that ​

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