Large wind tunnel composite material blade and preparation method thereof

Abstract

The invention discloses a large wind tunnel composite material blade which comprises a pressure surface main beam, a suction surface main beam, a pressure surface shell, a suction surface shell and a metal blade root. One end of the metal blade root is tightly held at one end of the pressure surface main beam and one end of the suction surface main beam and is adaptively bonded with the pressure surface main beam and the suction surface main beam, the pressure surface shell is bonded with the pressure surface main beam, and the pressure surface shell is respectively bonded with a plurality of rib plates which are arranged at intervals along the extension direction of the integral main beam on two sides of the integral main beam; the suction surface shell and the pressure surface shell are bonded to form a blade body, and the suction surface shell is bonded with the suction surface main beam and the rib plates. The invention further discloses a preparation method of the large wind tunnel composite material blade. The large wind tunnel composite material blade and the preparation method thereof have the advantages that connection is convenient, the connection strength is guaranteed, the requirement for a mold is low, and the manufacturing cost is low.

Description

Technical Field

[0001] This invention relates to the field of wind tunnel equipment technology, specifically to a large wind tunnel composite material blade and its preparation method. Background Technology

[0002] Chinese patent document with application number 202411803561.5 discloses a full-size wind tunnel high-load blade, relating to the field of wind tunnel equipment technology. It includes a metal blade root, a hollow main beam, and a blade body. One end of the metal blade root is provided with a main beam connecting section, the sidewall of which is a first conical sidewall. The larger end of the first conical sidewall is closer to the end of the metal blade root with the main beam connecting section than the smaller end. The hollow main beam is made of carbon fiber cloth. One end of the hollow main beam is provided with a blade root connecting section, which is fixedly fitted onto the main beam connecting section. The inner sidewall of the blade root connecting section is a second conical sidewall, which fits against the first conical sidewall. The blade body is made of carbon fiber. The blade body is fixedly mounted on the hollow main beam. The hollow main beam of the high-load blade of the full-size wind tunnel is generally manufactured as a single piece. On the one hand, the hollow main beam is connected by wrapping the metal blade root with carbon fiber cloth, which is inconvenient to connect and difficult to guarantee the connection strength. On the other hand, the hollow main beam is a hollow irregular column, and the integral molding requires high mold requirements and has high manufacturing cost. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a large wind tunnel composite material blade and its preparation method that is convenient to connect, conducive to ensuring connection strength, and has low requirements for molds and low manufacturing costs.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A large wind tunnel composite blade includes a pressure surface main beam, a suction surface main beam, a pressure surface shell, a suction surface shell, and a metal blade root. The pressure surface main beam and the suction surface main beam are bonded together to form an integral main beam. One end of the metal blade root is tightly attached to one end of the pressure surface main beam and the suction surface main beam and is adapted and bonded to the pressure surface main beam and the suction surface main beam. The pressure surface shell is bonded to the pressure surface main beam. Multiple ribs arranged at intervals along the extension direction of the integral main beam are bonded to both sides of the pressure surface shell. The suction surface shell and the pressure surface shell are bonded together to form the blade body. The suction surface shell is bonded to the suction surface main beam and each rib.

[0005] As a further improvement to the above technical solution: The pressure surface main beam and the suction surface main beam are respectively provided with a groove and a convex plate at the joint, and the groove and the convex plate are embedded and bonded together.

[0006] The groove is located on the inner side of the pressure surface main beam, and the convex plate is located on the outer side of the suction surface main beam.

[0007] One end of the metal blade root is provided with a tapered connector with a larger outer end and a smaller inner end. One end of the pressure surface main beam and the suction surface main beam are respectively provided with a first fitting surface and a second fitting surface that are adapted to the tapered connector. The first fitting surface and the second fitting surface are tightly wrapped around the outer circumferential surface of the tapered connector and are bonded to the tapered connector.

[0008] The end of the metal blade root facing the tapered connector has an alignment ring surface, and the end faces of the pressure surface main beam and the suction surface main beam both abut against the alignment ring surface.

[0009] Both the pressure surface main beam and the suction surface main beam are bonded to the alignment ring surface.

[0010] The inner sides of both the pressure surface shell and the suction surface shell are provided with multiple thickened sections arranged at intervals along the axial direction of the overall main beam.

[0011] The pressure surface main beam and suction surface main beam, suction surface main beam and suction surface shell, pressure surface main beam and pressure surface shell, and pressure surface shell and suction surface shell are all bonded together with structural adhesive.

[0012] Both the pressure surface main beam and the suction surface main beam are bonded to the metal blade root with structural adhesive, and the suction surface shell, the pressure surface shell, and the overall main beam are all bonded to each rib plate with structural adhesive.

[0013] A method for preparing the above-mentioned large wind tunnel composite material blade includes the following steps: S1. The pressure surface main beam, suction surface main beam, pressure surface shell and suction surface shell are formed separately by mold layering; S2. Bond the pressure surface main beam and the suction surface main beam to form an integral main beam, and make one end of the metal blade root tightly hug and bond it to one end of the pressure surface main beam and the suction surface main beam, and then demold the pressure surface main beam and the suction surface main beam separately. S3. The main beam is bonded to the pressure surface shell through the pressure surface main beam, and multiple ribs arranged at intervals along the extension direction of the main beam are bonded to the pressure surface shell on both sides of the main beam. S4. The suction surface shell and the pressure surface shell are bonded together to form the blade body, and the suction surface shell, suction surface main beam, and each rib are also bonded together; S5. Demold the pressure surface shell and the suction surface shell separately.

[0014] Compared with the prior art, the advantages of the present invention are as follows: The large wind tunnel composite blade of this invention uses a split main beam (pressure surface main beam and suction surface main beam) bonded together, which is relatively integrally molded. Firstly, one end of the metal blade root can be tightly bonded to one end of the pressure surface main beam and the suction surface main beam to achieve connection, which is convenient and helps to ensure connection strength. Secondly, the pressure surface main beam and the suction surface main beam (generally the mating surface of the pressure surface main beam and the suction surface main beam coincides with the central axis of the overall main beam) are formed by lay-up using their respective molds, which has low requirements for molds and low manufacturing cost. Thirdly, the bonding connection method ensures overall strength and helps to improve overall manufacturing efficiency.

[0015] The method for preparing large wind tunnel composite material blades of the present invention has the following aspects: First, one end of the metal blade root is tightly bound and bonded to one end of the pressure surface main beam and the suction surface main beam to achieve connection, which is both convenient and conducive to ensuring connection strength; Second, the pressure surface main beam and the suction surface main beam (generally, the mating surfaces of the pressure surface main beam and the suction surface main beam coincide with the central axis of the overall main beam) are formed by lay-up using their respective molds, which has low requirements for molds and low manufacturing costs; Third, the separate pressure surface main beam and suction surface main beam will face the problem of splicing and alignment, which is solved by combining and bonding them into an overall main beam using molds. The separate demolding process helps ensure alignment accuracy and bonding strength, solving the splicing alignment problem. (The molds for the pressure surface main beam and the suction surface main beam can be equipped with docking and locking mechanisms respectively. The docking mechanism enables precise alignment of the pressure surface main beam and the suction surface main beam, and the locking mechanism ensures bonding strength. Similarly, the suction surface shell and the pressure surface shell are spliced ​​and bonded together by combining molds to form the blade, and then demolded separately, which helps ensure alignment accuracy and bonding strength.) Fourthly, the cleverly designed sequence of each step facilitates alignment and bonding operations, which helps improve preparation efficiency. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural schematic diagram of the large wind tunnel composite material blade of the present invention.

[0017] Figure 2 This is a three-dimensional structural diagram of the integral main beam of the large wind tunnel composite material blade of the present invention.

[0018] Figure 3 This is an exploded structural diagram of the integral main beam of the large wind tunnel composite material blade of the present invention.

[0019] Figure 4 This is a schematic diagram of the cross-sectional structure of the integral main beam of the large wind tunnel composite material blade of the present invention.

[0020] Figure 5 This is a schematic diagram of the bonding structure between the integral main beam and the suction surface shell of the large wind tunnel composite material blade of the present invention.

[0021] Figure 6 This is a schematic diagram of the bonding rib plate of the large wind tunnel composite material blade of the present invention.

[0022] The labels in the diagram represent: 1. Pressure surface main beam; 11. Groove; 12. First mating surface; 2. Suction surface main beam; 21. Convex plate; 22. Second mating surface; 3. Pressure surface shell; 4. Suction surface shell; 5. Metal blade root; 51. Conical connector; 52. Alignment ring surface; 6. Rib plate; 7. Thickened part. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] In this invention, unless otherwise explicitly specified and limited, the terms "assembly," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] Example 1: Figures 1 to 6This invention illustrates an embodiment of a large wind tunnel composite material blade. The large wind tunnel composite material blade of this embodiment includes a pressure surface main beam 1, a suction surface main beam 2, a pressure surface shell 3, a suction surface shell 4, and a metal blade root 5. The pressure surface main beam 1 and the suction surface main beam 2 are bonded together to form an integral main beam. One end of the metal blade root 5 is tightly attached to one end of the pressure surface main beam 1 and the suction surface main beam 2, and is adapted to and bonded to them. The pressure surface shell 3 is bonded to the pressure surface main beam 1. Multiple ribs 6, spaced apart along the extension direction of the integral main beam, are bonded to both sides of the pressure surface shell 3. The suction surface shell 4 and the pressure surface shell 3 are bonded together to form the blade body, and the suction surface shell 4 is bonded to the suction surface main beam 2 and each rib 6.

[0028] The fabrication process of this large wind tunnel composite material blade is as follows: First, pressure surface main beam 1, suction surface main beam 2, pressure surface shell 3, and suction surface shell 4 are formed separately using a mold for layering. Second, pressure surface main beam 1 and suction surface main beam 2 are bonded together to form an integral main beam, and one end of the metal blade root 5 is tightly bound and bonded to one end of pressure surface main beam 1 and suction surface main beam 2. Then, pressure surface main beam 1 and suction surface main beam 2 are demolded separately. Third, the integral main beam is bonded to pressure surface shell 3 through pressure surface main beam 1, and multiple ribs 6 arranged at intervals along the extension direction of integral main beam are bonded to both sides of pressure surface shell 3. Fourth, suction surface shell 4 and pressure surface shell 3 are bonded together to form the blade body, and suction surface shell 4 is bonded to suction surface main beam 2 and each rib 6. Fifth, pressure surface shell 3 and suction surface shell 4 are demolded separately.

[0029] The main beam of this large wind tunnel composite blade is manufactured by bonding two separate parts (pressure surface main beam 1 and suction surface main beam 2) together, which is relatively integrally formed. Firstly, one end of the metal blade root 5 can be tightly bonded to one end of the pressure surface main beam 1 and the suction surface main beam 2 to achieve connection, which is convenient and helps to ensure the connection strength. Secondly, the pressure surface main beam 1 and the suction surface main beam 2 (generally, the mating surfaces of the pressure surface main beam 1 and the suction surface main beam 2 coincide with the central axis of the overall main beam) are formed by lay-up using their respective molds, which has low requirements for molds and low manufacturing cost. Thirdly, the bonding connection method ensures the overall strength and helps to improve the overall manufacturing efficiency.

[0030] Furthermore, such as Figure 3 and Figure 4 As shown in this embodiment, the joint between the pressure surface main beam 1 and the suction surface main beam 2 is provided with a groove 11 and a convex plate 21, respectively, which are fitted and bonded together. The joint between the pressure surface main beam 1 and the suction surface main beam 2 is bonded together by the groove 11 and the convex plate 21, which increases the bonding area and thus improves the connection strength.

[0031] Furthermore, in this embodiment, the groove 11 is located on the inner side of the pressure surface main beam 1, and the protruding plate 21 is located on the outer side of the suction surface main beam 2, so that the mating surfaces on both sides of the pressure surface main beam 1 and the suction surface main beam 2 are respectively curved stepped surfaces. Preferably, the outer surface of the protruding plate 21 is a slope, which facilitates its fitting with the groove 11.

[0032] Furthermore, such as Figure 3 As shown, in this embodiment, one end of the metal blade root 5 is provided with a tapered connector 51, which is larger at the outer end and smaller at the inner end. One end of the pressure surface main beam 1 and the suction surface main beam 2 are respectively provided with a first fitting surface 12 and a second fitting surface 22 that are adapted to the tapered connector 51. The first fitting surface 12 and the second fitting surface 22 are tightly fitted onto the outer circumferential surface of the tapered connector 51 and bonded to it. The inner end of the tapered connector 51 is the end connected to the metal blade root 5, and the outer end is the end away from the metal blade root 5. The tapered connector 51 is tapered, which facilitates coaxiality with the overall main beam after being tightly bonded to the pressure surface main beam 1 and the suction surface main beam 2, improving assembly accuracy. Furthermore, during the process of tightly bonding the tapered connector 51 to the pressure surface main beam 1 and the suction surface main beam 2, a tight bond can be achieved by pulling the metal blade root 5 outwards, while ensuring the thickness of the adhesive layer.

[0033] Furthermore, in this embodiment, the end of the metal blade root 5 facing the conical connector 51 has an alignment ring surface 52, and the end faces of the pressure surface main beam 1 and the suction surface main beam 2 both abut against the alignment ring surface 52. Under the limiting effect of the alignment ring surface 52, the assembly accuracy of the conical connector 51 with the pressure surface main beam 1 and the suction surface main beam 2 can be further improved.

[0034] Furthermore, in this embodiment, both the pressure surface main beam 1 and the suction surface main beam 2 are bonded to the alignment ring surface 52, further improving the overall connection strength.

[0035] Furthermore, in this embodiment, the inner sides of both the pressure surface shell 3 and the suction surface shell 4 are provided with a plurality of thickened portions 7 arranged at intervals along the axial direction of the overall main beam. Under the thickening effect of the thickened portions 7, on the one hand, it is beneficial to ensure the overall structural strength, and on the other hand, other parts can be made thinner to achieve the effect of weight reduction.

[0036] Furthermore, in this embodiment, the pressure surface main beam 1 and the suction surface main beam 2, the suction surface main beam 2 and the suction surface shell 4, the pressure surface main beam 1 and the pressure surface shell 3, and the pressure surface shell 3 and the suction surface shell 4 are all bonded together with structural adhesive. The bonding strength is ensured by using existing structural adhesives with high connection strength.

[0037] Furthermore, in this embodiment, both the pressure surface main beam 1 and the suction surface main beam 2 are bonded to the metal blade root 5 using structural adhesive, and the suction surface shell 4, the pressure surface shell 3, and the overall main beam are all bonded to each rib plate 6 using structural adhesive. The use of readily available structural adhesives with high bonding strength ensures the connection strength.

[0038] Example 2: A method for preparing a large wind tunnel composite material blade according to Embodiment 1 includes the following steps: S1. The pressure surface main beam 1, the suction surface main beam 2, the pressure surface shell 3, and the suction surface shell 4 are formed by mold layering. S2. Bond the pressure surface main beam 1 and the suction surface main beam 2 to form an integral main beam, and make one end of the metal blade root 5 hug and bond it to one end of the pressure surface main beam 1 and the suction surface main beam 2, and then demold the pressure surface main beam 1 and the suction surface main beam 2 respectively. S3. The main beam is bonded to the pressure surface shell 3 via the pressure surface main beam 1, and multiple ribs 6 are bonded to the pressure surface shell 3 on both sides of the main beam at intervals along the extension direction of the main beam. S4. The suction surface shell 4 and the pressure surface shell 3 are bonded together to form the blade body, and the suction surface shell 4, the suction surface main beam 2, and each rib plate 6 are bonded together. S5. Demold the pressure surface shell 3 and the suction surface shell 4 separately.

[0039] The method for preparing composite material blades for this large wind tunnel involves three aspects: First, one end of the metal blade root 5 is tightly connected and bonded to one end of the pressure surface main beam 1 and the suction surface main beam 2, which is both convenient and ensures connection strength. Second, the pressure surface main beam 1 and the suction surface main beam 2 (generally, the mating surfaces of the pressure surface main beam 1 and the suction surface main beam 2 coincide with the central axis of the overall main beam) are formed by lay-up using their respective molds, which reduces the requirements for molds and lowers manufacturing costs. Third, the separate pressure surface main beam 1 and suction surface main beam 2 will face the problem of splicing and alignment. This is addressed by combining and bonding them into an overall main beam using a mold. The separate demolding method helps to ensure alignment accuracy and bonding strength, and solves the splicing alignment problem. (The molds of the pressure surface main beam 1 and the suction surface main beam 2 can be respectively equipped with docking mechanism and locking mechanism. The docking mechanism realizes the precise alignment of the pressure surface main beam 1 and the suction surface main beam 2, and the locking mechanism ensures the bonding strength. Similarly, the suction surface shell 4 and the pressure surface shell 3 are spliced ​​and bonded into blades by combining the molds and then demolded separately, which helps to ensure alignment accuracy and bonding strength.) Fourthly, the cleverly set sequence of each step facilitates alignment and bonding operations, which helps to improve the preparation efficiency.

[0040] It should be noted that the pressure surface main beam 1, the suction surface main beam 2, the pressure surface shell 3, and the suction surface shell 4 can all be formed by laying powdered composite materials on a mold, embedding other materials (such as foam), and then heating and curing.

[0041] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A large wind tunnel composite material blade, characterized in that: The structure includes a pressure surface main beam (1), a suction surface main beam (2), a pressure surface shell (3), a suction surface shell (4), and a metal blade root (5). The pressure surface main beam (1) and the suction surface main beam (2) are bonded together to form an integral main beam. One end of the metal blade root (5) is tightly attached to one end of the pressure surface main beam (1) and the suction surface main beam (2) and is adapted to be bonded to the pressure surface main beam (1) and the suction surface main beam (2). The pressure surface shell (3) is bonded to the pressure surface main beam (1). The pressure surface shell (3) is bonded to both sides of the integral main beam with multiple ribs (6) arranged at intervals along the extension direction of the integral main beam. The suction surface shell (4) and the pressure surface shell (3) are bonded together to form a blade body. The suction surface shell (4) is bonded to the suction surface main beam (2) and each rib (6).

2. The large wind tunnel composite material blade according to claim 1, characterized in that: The pressure surface main beam (1) and the suction surface main beam (2) are respectively provided with a groove (11) and a convex plate (21), and the groove (11) and the convex plate (21) are fitted and bonded together.

3. The large wind tunnel composite material blade according to claim 2, characterized in that: The groove (11) is located on the inner side of the pressure surface main beam (1), and the convex plate (21) is located on the outer side of the suction surface main beam (2).

4. The large wind tunnel composite material blade according to claim 1, characterized in that: One end of the metal leaf root (5) is provided with a tapered connector (51) with a larger outer end and a smaller inner end. One end of the pressure surface main beam (1) and the suction surface main beam (2) are respectively provided with a first fitting surface (12) and a second fitting surface (22) that are adapted to the tapered connector (51). The first fitting surface (12) and the second fitting surface (22) are tightly wrapped around the outer circumferential surface of the tapered connector (51) and bonded to the tapered connector (51).

5. The large wind tunnel composite material blade according to claim 4, characterized in that: The metal blade root (5) has an alignment ring surface (52) at one end facing the tapered connector (51), and the end faces of the pressure surface main beam (1) and the suction surface main beam (2) abut against the alignment ring surface (52).

6. The large wind tunnel composite material blade according to claim 5, characterized in that: Both the pressure surface main beam (1) and the suction surface main beam (2) are bonded to the alignment ring surface (52).

7. The large wind tunnel composite material blade according to claim 1, characterized in that: The inner sides of both the pressure surface shell (3) and the suction surface shell (4) are provided with multiple thickened parts (7) arranged at intervals along the axial direction of the overall main beam.

8. The large wind tunnel composite material blade according to any one of claims 1 to 7, characterized in that: The pressure surface main beam (1) and suction surface main beam (2), suction surface main beam (2) and suction surface shell (4), pressure surface main beam (1) and pressure surface shell (3), and pressure surface shell (3) and suction surface shell (4) are all bonded together with structural adhesive.

9. The large wind tunnel composite material blade according to any one of claims 1 to 7, characterized in that: The pressure surface main beam (1) and the suction surface main beam (2) are both bonded to the metal blade root (5) with structural adhesive. The suction surface shell (4), the pressure surface shell (3) and the overall main beam are all bonded to each rib plate (6) with structural adhesive.

10. A method for preparing a large wind tunnel composite material blade according to any one of claims 1 to 9, characterized in that, Includes the following steps: S1. The pressure surface main beam (1), the suction surface main beam (2), the pressure surface shell (3) and the suction surface shell (4) are formed by mold layering. S2. Bond the pressure surface main beam (1) and the suction surface main beam (2) together to form an integral main beam, and make one end of the metal blade root (5) hug and bond to one end of the pressure surface main beam (1) and the suction surface main beam (2), and then demold the pressure surface main beam (1) and the suction surface main beam (2) respectively. S3. The main beam is bonded to the pressure surface shell (3) through the pressure surface main beam (1), and multiple ribs (6) arranged at intervals along the extension direction of the main beam are bonded to the pressure surface shell (3) on both sides of the main beam. S4. The suction surface shell (4) and the pressure surface shell (3) are bonded together to form the blade body, and the suction surface shell (4), the suction surface main beam (2), and each rib plate (6) are bonded together. S5. Demold the pressure surface shell (3) and the suction surface shell (4) respectively.

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