A pre-cured section stiffened wrinkle resistant fabric for wind turbine blades

Abstract

The present application relates to a kind of anti-wrinkle fabric reinforced by pre-cured part and wind power blade, the anti-wrinkle fabric includes the pre-cured reinforcing resin strip and fabric main yarn arranged in staggered interval, wherein, the pre-cured reinforcing resin strip is impregnated with resin by yarn body and solidified, the direction of the pre-cured resin strip and fabric main yarn is consistent.Compared with prior art, the anti-wrinkle fabric of the present application considers freedom and rigidity, and has the effect of resisting in-plane, out-of-plane wrinkle simultaneously.

Description

Technical Field

[0001] This invention belongs to the field of wind power generation technology and relates to a wrinkle-resistant fabric with pre-cured stiffening and wind turbine blades. Background Technology

[0002] Currently, fabrics used in the wind power industry, such as carbon fiber fabrics and fiberglass fabrics, possess a high degree of freedom and are very flexible. However, this very freedom can lead to in-plane or out-of-plane wrinkles, which are the most critical factor causing wind turbine blade failure. To address wrinkles, the wind power industry often employs fabric modifications, such as using heavier fabrics or pre-cured laminates with a certain rigidity to prevent wrinkle formation. However, existing solutions typically cannot simultaneously resist both in-plane and out-of-plane wrinkles. Summary of the Invention

[0003] The purpose of this invention is to provide a wrinkle-resistant fabric and wind turbine blades that are stiffened by a pre-cured portion, so as to solve the problem that existing fabrics cannot simultaneously resist both in-plane and out-of-plane wrinkles.

[0004] The objective of this invention can be achieved through the following technical solutions:

[0005] One of the technical solutions of the present invention provides a wrinkle-resistant fabric reinforced by a pre-cured portion, which includes pre-cured reinforcing resin strips and main fabric yarns arranged in an alternating manner. The pre-cured reinforcing resin strips are formed by impregnating and curing the yarn body with resin. The pre-cured resin strips are aligned with the main fabric yarns, and the thickness of the pre-cured reinforcing resin strips and the main fabric yarns are continuous and in the same plane.

[0006] At this point, by introducing pre-cured reinforcing resin strips, a rigid skeleton structure with a certain degree of freedom is formed in the fabric, which is used to resist in-plane or out-of-plane wrinkles of the laminate in composite wind turbine blades.

[0007] Furthermore, the yarn body in the pre-cured resin strip is made of the same material as the main yarn of the fabric, both being ordinary yarn. Even further, the ordinary yarn is selected from one or more of carbon fiber, glass fiber, aramid fiber, spandex fiber, plant fiber, and thermoplastic fiber.

[0008] Furthermore, the resin used in the pre-cured reinforcing resin strip is selected from one or more thermosetting resins or thermoplastic resins. Preferably, the resin used satisfies the characteristic that the pre-cured reinforcing resin strip does not soften at a high temperature of 150°C after curing. More specifically, the thermosetting resin may be selected from at least one of epoxy resin, vinyl resin, polyester resin, etc., while the thermoplastic resin may be selected from at least one of polyethylene resin, polyamide resin, polypropylene resin, etc.

[0009] Furthermore, the interval between two adjacent pre-cured reinforcing resin strips is 10-300mm.

[0010] Furthermore, the pre-cured reinforcing resin strips in the fabric can be uniformly distributed or unevenly distributed. Additionally, the length of each pre-cured reinforcing resin strip can be selected as needed; the lengths of the pre-cured reinforcing resin strips in a single piece of fabric can be equal or unequal.

[0011] Furthermore, the width of each pre-cured reinforcing resin strip is 2-50mm.

[0012] Furthermore, the pre-cured reinforcing resin in the anti-wrinkle fabric is obtained by coating the yarn with resin and curing it after yarn weaving and before winding, or by coating the yarn with resin and curing it after yarn weaving, winding and unwinding.

[0013] Furthermore, the resin can be cured by heat curing, light curing, or natural curing.

[0014] Furthermore, the yarns in this anti-wrinkle fabric are woven using any one of the following methods: plain warp, variable warp, double variable warp, or chain braiding.

[0015] Furthermore, the anti-wrinkle fabric has at least two pre-cured reinforcing resin strips.

[0016] Furthermore, the weight of the wrinkle-resistant fabric is 300gsm-3000gsm.

[0017] Furthermore, the anti-wrinkle fabric is a uniaxial, biaxial, or multiaxial fabric.

[0018] A second technical solution of the present invention provides a wind turbine blade made of any of the anti-wrinkle fabrics described above. Preferably, the wind turbine blade contains at least one piece of the aforementioned anti-wrinkle fabric, and the location where the anti-wrinkle fabric is used is free from in-plane and out-of-plane wrinkles and failures caused by core material steps.

[0019] Compared with the prior art, the present invention forms a pre-cured reinforcing resin strip by coating the fabric woven from yarn with resin, thereby forming an anti-wrinkle fabric that balances freedom and stiffness, and simultaneously resists in-plane and out-of-plane wrinkles and core material steps. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the anti-wrinkle fabric of the present invention;

[0021] Figure 2 This is a schematic diagram of the tissue structure in an anti-wrinkle fabric;

[0022] Explanation of markings in the diagram:

[0023] 1-Main yarn of fabric, 2-Pre-cured resin reinforcing strip. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0025] Unless otherwise specified, the raw materials or processing techniques used in the following embodiments or examples are conventional commercially available raw materials or conventional processing techniques in the art.

[0026] To simultaneously resist both in-plane and out-of-plane wrinkles, this invention provides a wrinkle-resistant fabric reinforced by a pre-cured portion, comprising pre-cured reinforcing resin strips and the main fabric yarn arranged in an alternating manner. The pre-cured reinforcing resin strips are formed by impregnating and curing the yarn body with resin. The pre-cured resin strips are aligned with the main fabric yarn, and their thicknesses are continuous and they are in the same plane.

[0027] At this point, by introducing pre-cured reinforcing resin strips, a rigid skeleton structure with a certain degree of freedom is formed in the fabric, which is used in composite wind turbine blades to resist in-plane or out-of-plane wrinkles of the laminate.

[0028] In some specific embodiments, the yarn body in the pre-cured resin strip is made of the same material as the main yarn of the fabric, which is ordinary yarn. Furthermore, the ordinary yarn is selected from one or more of carbon fiber, glass fiber, aramid fiber, spandex fiber, plant fiber, and thermoplastic fiber.

[0029] In some specific embodiments, the resin used in the pre-cured reinforcing resin strip is selected from one or more thermosetting resins or thermoplastic resins. Preferably, the resin used satisfies the characteristic that the pre-cured reinforcing resin strip does not soften at a high temperature of 100°C after curing. More specifically, the thermosetting resin may be selected from at least one of epoxy resin, vinyl resin, polyester resin, etc., while the thermoplastic resin may be selected from at least one of polyethylene resin, polyamide resin, polypropylene resin, etc.

[0030] In some specific implementations, the interval between two adjacent pre-cured reinforcing resin strips is 10-300 mm.

[0031] In some specific embodiments, the pre-cured reinforcing resin strips in the fabric can be uniformly distributed or non-uniformly distributed. Furthermore, the length of each pre-cured reinforcing resin strip can be selected as needed, and the lengths of the pre-cured reinforcing resin strips in a single piece of fabric can be equal or unequal.

[0032] In some specific implementations, the width of each pre-cured reinforcing resin strip is 2-50 mm.

[0033] In some specific embodiments, the pre-cured reinforcing resin in the anti-wrinkle fabric is obtained by coating the yarn with resin and curing it after yarn weaving and before winding, or by coating the yarn with resin and curing it after yarn weaving, winding and unwinding.

[0034] In some specific implementations, the resin is cured by heat curing, light curing, or natural curing.

[0035] In some specific embodiments, the yarns in the anti-wrinkle fabric are woven in any one of the following methods: plain warp, variable warp, double variable warp, or chain braid.

[0036] In some specific embodiments, the anti-wrinkle fabric has at least two pre-cured reinforcing resin strips.

[0037] In some specific embodiments, the weight of the anti-wrinkle fabric is 300gsm-3000gsm.

[0038] Furthermore, the anti-wrinkle fabric is a uniaxial, biaxial, or multiaxial fabric.

[0039] Each of the above implementation methods can be implemented individually, or in any combination of two or more.

[0040] The above implementation methods will be described in more detail below with reference to specific embodiments.

[0041] Example 1:

[0042] This embodiment provides a wrinkle-resistant fabric reinforced by pre-curing. The fabric is made by partially impregnating the yarn with epoxy resin after weaving, followed by photocuring. The wrinkle-resistant fabric product includes interleaved pre-cured reinforcing resin strips and the main fabric yarn. The pre-cured reinforcing resin strips are formed by impregnating and curing the yarn body with resin. The pre-cured resin strips are aligned with the main fabric yarn, and their thicknesses are continuous, lying in the same plane.

[0043] Please see again. Figure 1 and Figure 2As shown, the anti-wrinkle fabric of this embodiment contains two pre-cured reinforcing resin strips, with a spacing of approximately 50 mm between them. The spacing between the two pre-cured reinforcing resin strips is equal to the width of the strips along a direction perpendicular to the main yarn of the fabric. Simultaneously, the length of the pre-cured reinforcing resin strips is equal to the length of the main yarn. In this embodiment, the main yarn used is ordinary modulus glass fiber. The yarn of the anti-wrinkle fabric is woven using a warp-plain weave. The weight of the anti-wrinkle fabric in this embodiment is approximately 1200 gsm.

[0044] Comparative Example 1:

[0045] Most of the components are the same as in Example 1, except that the fabric was not resin-impregnated, i.e., no pre-cured reinforcing resin strips were introduced.

[0046] The fabrics obtained in Example 1 and Comparative Example 1 were used to prepare wind turbine blades, and the wrinkle AR value of the wind turbine blades was measured. The data obtained are shown in Table 1 below. It can be seen that after introducing the pre-cured reinforcing resin strip, the anti-wrinkle fabric in Example 1 has a better anti-wrinkle effect after being made into wind turbine blades.

[0047] Table 1. Performance comparison of the products obtained in Example 1 and Comparative Example 1

[0048] product Example 1 Comparative Example 1 AR value of wrinkles 0.03 0.1

[0049] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A wrinkle-resistant fabric reinforced by a pre-cured portion, characterized in that, It comprises pre-cured reinforcing resin strips and main fabric yarns arranged in an alternating manner. The pre-cured reinforcing resin strips are formed by impregnating and curing the yarn body with resin. The pre-cured reinforcing resin strips are aligned with the main fabric yarns, and the thickness of the pre-cured reinforcing resin strips and the main fabric yarns are continuous and in the same plane. The pre-cured reinforcing resin strip in the anti-wrinkle fabric is obtained by partially impregnating and curing the yarn with resin after weaving and before winding, or by partially impregnating and curing the yarn with resin after weaving, winding and unwinding. The anti-wrinkle fabric comprises at least two strips of the pre-cured reinforcing resin; The length of the pre-cured reinforcing resin strips included in the anti-wrinkle fabric can be selected as needed, and the lengths of the pre-cured reinforcing resin strips in a single piece of stiffened anti-wrinkle fabric can be equal or unequal. The distribution of the pre-cured reinforcing resin strips in the stiffened, wrinkle-resistant fabric is unrestricted; they can be uniformly or non-uniformly distributed. The yarn body in the precured reinforced resin strip is made of the same material as the main yarn of the fabric, specifically selected from one or more of carbon fiber, glass fiber, aramid fiber, plant fiber, and thermoplastic fiber. The weight of the anti-wrinkle fabric is 300gsm-3000gsm; the anti-wrinkle fabric is uniaxial, biaxial or multiaxial fabric; The anti-wrinkle fabric can be woven using any one of the following methods: plain warp, variable plain warp, or chain braid.

2. The anti-wrinkle fabric reinforced by a pre-cured portion according to claim 1, characterized in that, The spacing between two adjacent pre-cured reinforcing resin strips is 10-300mm; The width of each pre-cured reinforced resin strip is 2-50mm.

3. The anti-wrinkle fabric reinforced by a pre-cured portion according to claim 1, characterized in that, The resin used in the pre-cured reinforced resin strip is selected from one or more of thermosetting resins or thermoplastic resins, and it satisfies the characteristic that the pre-cured reinforced resin strip does not soften at a high temperature of 100°C after curing. The thermosetting resin is selected from at least one of epoxy resin, vinyl resin, and polyester resin; The thermoplastic resin is selected from at least one of polyethylene resin, polyamide resin, and polypropylene resin.

4. The anti-wrinkle fabric reinforced by a pre-cured portion according to claim 1, characterized in that, The resin can be cured by heat curing, light curing, or natural curing.

5. A wind turbine blade, characterized in that, It is made using the anti-wrinkle fabric as described in any one of claims 1-4.

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