Method for eliminating air leakage during blade maintenance

Abstract

The invention discloses a method for eliminating air leakage in blade maintenance, which comprises the following steps of: polishing a bottom lining, removing a defect area paving layer of a blade shell, reserving the bottom lining layer, and polishing the reserved bottom lining layer; a sealing material is laid, specifically, the sealing material infiltrated with a resin material is laid on the operation face of the bottom lining layer to form a sealing layer; a demolding material is laid, specifically, the demolding material is laid on the sealing layer to form a demolding layer; and a pressure applying bag is laid, and the pressure applying bag is laid on the demolding layer so that the pressure applying bag can apply pressure to the sealing layer till the sealing layer is solidified. According to the method for eliminating air leakage in blade maintenance, the sealing material soaked with the resin material is laid on the bottom lining reserved in the defective area of the blade, pressure is applied to the upper portion of the pressure applying bag to discharge redundant resin, bubbles and other defects, and the basic face suitable for vacuum infusion operation is obtained in the defective area of the blade; subsequent pouring maintenance work is facilitated, and the repairing quality and efficiency of the air leakage blade are improved.

Description

Technical Field

[0001] The present application relates to the technical field of blade maintenance, and more specifically, to a method for eliminating air leakage during blade maintenance. Background Art

[0002] The sealing of the defective area of ​​the blade has a great impact on the blade defect repair work at the operation site. When there is air leakage in the lining or the surrounding area, a large amount of leak detection, rework and repair work can only be carried out repeatedly, and even the original injection molding is changed to a hand lay-up production plan. The additional repair weight increases the weight of the entire blade and the risk of torque balancing.

[0003] During repair, operators usually make a blade-shaped backing liner at the end of the defect grinding process of the blade, and manually lay a glass fiber layer on the reserved backing liner to perform a simple sealing treatment on the leakage point. However, the manually laid glass fiber layer often fails to achieve the expected effect. Not only can it not completely and quickly seal the defective area, but it also causes too much resin-rich residue in the repair layer, affecting the overall repair quality of the blade, and the repair efficiency is low.

[0004] Therefore, how to improve the repair quality and efficiency of leaking blades has become a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0005] In view of this, the purpose of the present application is to provide a method for eliminating air leakage during blade maintenance, so as to improve the repair quality and efficiency of leaking blades.

[0006] To achieve the above objectives, this application provides the following technical solutions:

[0007] A method for eliminating air leakage during blade maintenance, comprising the steps of:

[0008] Grinding the backing, removing the ply in the defective area of ​​the blade shell, reserving the backing layer, and grinding the reserved backing layer to make the operating surface of the backing layer smooth;

[0009] Laying a sealing material, laying a sealing material impregnated with a resin material on the operating surface of the bottom lining layer to form a sealing layer;

[0010] Laying a demoulding material, laying a demoulding material on the sealing layer to form a demoulding layer;

[0011] Laying a pressure bag, laying the pressure bag on the release layer, so that the pressure bag applies pressure to the sealing layer until the sealing layer is cured.

[0012] Optionally, in the above method for eliminating air leakage during blade maintenance, in the step of laying the pressure bag, the pressure bag covers the defective area of ​​the blade shell, and the pressure bag extends toward the periphery of the defective area of ​​the blade shell.

[0013] Optionally, in the above-mentioned method for eliminating air leakage during blade maintenance, in the step of laying the pressure bag, an adsorbent material is used to vacuum seal the pressure bag in the defective area of ​​the blade shell.

[0014] Optionally, in the above-mentioned method for eliminating air leakage during blade maintenance, a glue absorbing material is laid between the pressure bag and the demoulding layer to form a glue absorbing layer.

[0015] Optionally, in the above-mentioned method for eliminating air leakage during blade maintenance, the pressure bag includes a bag body and a glue absorbing layer.

[0016] Optionally, in the above-mentioned method for eliminating air leakage during blade maintenance, the glue absorbing material is glass fiber cloth, continuous felt, surface felt, guide net or air guide felt.

[0017] Optionally, in the above-mentioned method for eliminating air leakage during blade maintenance, in the step of laying the sealing material, the sealing material is sealing glass cloth.

[0018] Optionally, in the above method for eliminating air leakage during blade maintenance, the sealing glass cloth is a triaxial cloth, a biaxial cloth or a continuous felt.

[0019] Optionally, in the above method for eliminating air leakage during blade maintenance, the demoulding material is a demoulding cloth.

[0020] Optionally, in the above-mentioned method for eliminating air leakage during blade maintenance, in the step of laying the sealing material, the resin material is epoxy resin, polyurethane resin, vinyl resin, unsaturated resin or phenolic resin.

[0021] The present application provides a method for eliminating air leakage during blade maintenance, including the steps of polishing the base lining, laying the sealing material, laying the demoulding material and laying the pressure bag. In the step of polishing the base lining, the layer of the defective area of ​​the blade shell is removed, and the base lining layer is reserved, and the reserved base lining layer is polished to make the operating surface of the base lining layer smooth; in the step of laying the sealing material, the sealing material impregnated with the resin material is laid on the operating surface of the base lining layer to form a sealing layer; in the step of laying the demoulding material, the demoulding material is laid on the sealing layer to form a demoulding layer; in the step of laying the pressure bag, the pressure bag is laid on the demoulding layer so that the pressure bag applies pressure to the sealing material until the sealing material is solidified. It can be seen from the above examples that the method for eliminating blade leakage during repair provided by the present application is to lay a sealing material impregnated with resin material on the bottom lining layer reserved in the defective area of ​​the blade shell, and to expel excess resin, bubbles and other defects by applying pressure from above with a pressure bag, thereby obtaining a base surface suitable for vacuum infusion operations in the defective area of ​​the blade shell, facilitating subsequent infusion maintenance work, and thereby improving the repair quality and efficiency of leaking blades.

[0022] The technical features mentioned above, the technical features to be mentioned below, and the technical features shown separately in the drawings can be combined with each other arbitrarily, as long as the combined technical features are not contradictory. All feasible feature combinations are technical contents clearly recorded in this article. Any of the multiple sub-features contained in the same sentence can be applied independently, and does not have to be applied together with other sub-features. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0024] Figure 1 A flow chart for eliminating blade leakage provided in an embodiment of the present application;

[0025] Figure 2 A schematic diagram of the structure for eliminating blade leakage provided in an embodiment of the present application.

[0026] Among them, 100 is a blade shell, 101 is a reserved bottom liner, 102 is a sealing layer, 103 is a demoulding layer, 104 is a pressure bag, and 1041 is an adsorption material. DETAILED DESCRIPTION

[0027] The core of this application is to provide a method for eliminating air leakage during blade repair, so as to improve the repair quality and efficiency of leaking blades.

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] When repairing defective areas on blades, operators usually make a blade-shaped backing liner at the end of the defect grinding process of the blade, and manually lay a fiberglass layer on the reserved backing liner to perform a simple sealing treatment on the leakage point. However, the manually laid fiberglass layer often fails to achieve the expected effect. Not only can it not completely and quickly seal the defective area, but it also causes too much resin-rich residue in the repair layer, affecting the overall repair quality of the blade, and the repair efficiency is low.

[0030] For this reason, Figure 1As shown, the embodiment of the present application discloses a method for eliminating air leakage during blade repair, including step S100 of polishing the bottom liner, step S101 of laying the sealing material, step S102 of laying the demoulding material, and step S103 of laying the pressure bag. By laying the sealing material impregnated with the resin material on the bottom liner layer 101 reserved in the defective area of ​​the blade shell 100, and applying pressure on the top by the pressure bag 104 to discharge the excess resin, bubbles and other defects, a base surface suitable for vacuum infusion operation is obtained in the defective area of ​​the blade shell 100, which is convenient for subsequent infusion repair work, thereby improving the repair quality and efficiency of the leaking blade.

[0031] The following will be combined Figure 1 and Figure 2 The method for eliminating air leakage during blade maintenance disclosed in the embodiment of the present application is specifically explained and illustrated.

[0032] S100, polishing the backing;

[0033] The ply in the defective area of ​​the blade shell 100 is removed, and the bottom lining layer 101 is reserved, and the reserved bottom lining layer 101 is polished to make the operating surface of the bottom lining layer 101 smooth. Specifically, the damaged fiberglass and core material of the blade shell 100 are removed, and the fiberglass layer at the bottom is reserved as the bottom lining layer 101 to provide a reference surface and a basic airfoil for subsequent maintenance work, to ensure that the repaired ply follows the shape of the surrounding ply, and at the same time, the bottom lining layer 101 is finely polished and trimmed to ensure that the operating surface of the bottom lining layer 101 is smooth, without protruding edges and corners, and without spikes.

[0034] S101, laying sealing materials;

[0035] A sealing material impregnated with resin material is laid on the operating surface of the bottom lining layer 101 to form a sealing layer 102. Specifically, the sealing material impregnated with resin material is laid on top of the reserved bottom lining layer 101 and rolled and flattened, so that the defective area of ​​the blade shell 100 forms a closed cavity, ensuring smooth infusion molding of defect repair and avoiding problems such as air leakage, rework and repair. Among them, the sealing material can be a sealing glass cloth, and the sealing glass cloth can be a glass fiber material such as but not limited to a triaxial cloth, a biaxial cloth or a continuous felt. At the same time, the resin material impregnated with the sealing material can be epoxy resin, polyurethane resin, vinyl resin, unsaturated resin or phenolic resin, etc., but it must be ensured that it is the same system as the subsequent infusion resin.

[0036] S102, laying demoulding material;

[0037] A release material is laid on the sealing layer 102 to form a release layer 103. Specifically, the release material can be a release cloth, which is laid on the sealing layer 102 to provide a rough interface for the repair layer, so that the reserved bottom lining layer 100 and the subsequent repair layer can be effectively bonded and formed, thereby ensuring the repair quality of the blade.

[0038] S103, laying pressure bags;

[0039] The pressure bag 104 is laid on the release layer 103 so that the pressure bag 104 applies pressure to the sealing layer 102 until the sealing layer 102 is cured. Specifically, the pressure bag 104 covers the defective area of ​​the blade shell 100, and the pressure bag 104 extends to the periphery of the defective area of ​​the blade shell 100, and the pressure bag 104 is vacuum-sealed in the defective area of ​​the blade shell 100 using the adsorption material 1041 to apply pressure to the sealing layer 102 until the sealing layer 102 is cured, thereby obtaining a base surface suitable for vacuum infusion operation in the defective area of ​​the blade shell 100, facilitating subsequent infusion maintenance work, thereby improving the repair quality and efficiency of the leaking blade. At the same time, a glue absorbing material can be laid between the pressure bag 104 and the demoulding layer 103 to form a glue absorbing layer. When the pressure bag 104 applies pressure to the sealing layer 102, the excess resin material can enter the glue absorbing layer under pressure and solidify in the glue absorbing layer, so that the purpose of removing the excess resin material is achieved while removing the glue absorbing layer, and the defects of the bottom lining layer 101 such as whitening and lack of glue are avoided, thereby ensuring the overall molding quality of the damaged blade. Of course, the pressure bag 104 can include a bag body and a glue absorbing layer, that is, the pressure bag 104 can have its own glue absorbing layer, or a glue absorbing layer can be laid separately between the pressure bag 104 and the demoulding layer 103. Among them, the glue absorbing material can be glass fiber cloth, continuous felt, surface felt, guide net or air guide felt.

[0040] It should be noted that when repairing the defective area of ​​the blade shell 100, the repair area can be heated or auxiliary heated according to the actual situation to speed up the repair process of the defective area. When the sealing material is completely cured, the release layer 103, the pressure bag 104 and other auxiliary materials are removed, and the subsequent work can be carried out after the blade shell 100 has no defects, which will not be repeated in this article.

[0041] It can be seen from the above embodiments that the method for eliminating air leakage in blade repair provided by the present application is achieved by laying a sealing material impregnated with resin material on the bottom lining layer reserved in the defective area of ​​the blade shell, and applying pressure from a pressure bag on the top to expel excess resin, bubbles and other defects, thereby obtaining a base surface suitable for vacuum infusion operation in the defective area of ​​the blade shell, which can avoid the influence of excess resin material remaining in the bottom lining layer 101 on the quality of blade repair, eliminate the risk of secondary or multiple rework and repair due to air leakage of the bottom lining layer 101, facilitate subsequent infusion maintenance work, and improve the repair quality of the blade. At the same time, it can shorten the overall blade damage repair cycle, reduce the workload of on-site operators and related supporting personnel, improve the repair efficiency of the blade, and reduce the material and labor costs of rework and repair, thereby achieving the effect of reducing costs and increasing efficiency.

[0042] The terms "first" and "second" and the like in the specification and claims of this application and the above drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may include steps or units that are not listed.

[0043] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for eliminating air leakage during blade maintenance, characterized in that: Includes steps: Polishing the bottom lining, removing the ply in the defective area of ​​the blade shell (100), reserving the bottom lining layer (101), and polishing the reserved bottom lining layer (101) to make the operating surface of the bottom lining layer (101) smooth; Laying a sealing material, laying a sealing material impregnated with a resin material on the operating surface of the bottom lining layer (101) to form a sealing layer (102); Laying a demoulding material, laying the demoulding material on the sealing layer (102) to form a demoulding layer (103); Laying a pressure bag, laying a pressure bag (104) on the demoulding layer (103), so that the pressure bag (104) applies pressure to the sealing layer (102) until the sealing layer (102) is cured.

2. The method for eliminating air leakage during blade maintenance according to claim 1, characterized in that: In the step of laying the pressure bag, the pressure bag (104) covers the defective area of ​​the blade shell (100), and the pressure bag (104) extends toward the periphery of the defective area of ​​the blade shell (100).

3. The method for eliminating air leakage during blade maintenance according to claim 2, characterized in that: In the step of laying the pressure bag, an adsorbent material (1041) is used to vacuum seal the pressure bag (104) in the defective area of ​​the blade shell (100).

4. The method for eliminating air leakage during blade maintenance according to claim 1, characterized in that: A glue absorbing material is laid between the pressure bag (104) and the demoulding layer (103) to form a glue absorbing layer.

5. The method for eliminating air leakage during blade maintenance according to claim 4, characterized in that: The pressure bag (104) comprises a bag body and a glue absorbing layer.

6. The method for eliminating air leakage during blade maintenance according to claim 4, characterized in that: The glue absorbing material is glass fiber cloth, continuous felt, surface felt, flow guide net or air guide felt.

7. The method for eliminating air leakage during blade maintenance according to claim 1, characterized in that: In the step of laying the sealing material, the sealing material is sealing glass cloth.

8. The method for eliminating air leakage during blade maintenance according to claim 7, characterized in that: The sealing glass cloth is a triaxial cloth, a biaxial cloth or a continuous felt.

9. The method for eliminating air leakage during blade maintenance according to claim 1, characterized in that: The demoulding material is a demoulding cloth.

10. The method for eliminating air leakage during blade maintenance according to claim 1, characterized in that: In the step of laying the sealing material, the resin material is epoxy resin, polyurethane resin, vinyl resin, unsaturated resin or phenolic resin.

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