A flange-type tapered sleeve connection structure for wind tunnel blades

Abstract

The present invention relates to the technical field of blade structures, and discloses a flange-type tapered sleeve connection wind tunnel blade structure, which includes a blade main body, a connection component, and a flange tapered sleeve assembly; the blade main body includes a main support rib, a secondary support rib, a connection structure I, and a skin; the main support rib extends divergently along the direction from the blade root to the blade tip, and the secondary support rib is wound and fixed along the circumference of the main support rib to form a blade frame structure, and the skin is covered and fixed on the blade frame structure; both ends of the connection component are respectively connected to the blade main body and the tapered sleeve assembly, and are fixed on the hub mounting plate through the flange tapered sleeve assembly; the grid-shaped support structure formed by the main support rib and the secondary support rib serves as the main load-bearing structure of the blade. By separately molding it and the skin, it is more convenient for production, and the mechanical properties of the molded product are better, which can meet more complex pitch-changing requirements and higher blade dynamic performance; the requirements for materials are lower, the limitations are fewer, and it is more conducive to cost savings.

Description

Technical Field

[0001] The present invention relates to the technical field of blade structures, and more specifically, to a flange-type tapered sleeve connection wind tunnel blade structure. Background Art

[0002] To meet the development requirements of aerospace vehicles, new trends have emerged in the upgrading, reconstruction, new construction, and future development of wind tunnels. All types of wind tunnels, such as low-speed, transonic, supersonic, and hypersonic wind tunnels, have developed rapidly, and the scale and performance indicators of wind tunnels have been continuously improved. Large low-speed wind tunnels have the advantages of a wide total pressure change, a large Reynolds number change range, and good flow field quality. Therefore, the demand for large low-speed wind tunnels has been increasing in recent years. The impeller diameter of a large low-speed wind tunnel is about 10 m, the chord length is about 1.6 m, and the power reaches 280 MW. This requires the blade to have very high dynamic performance (frequency, strength, and stiffness). To meet the requirements of multiple working conditions, the blade is required to have a variable pitch function.

[0003] The existing variable pitch of wind tunnel blades mainly adopts flange connection and keyway connection. Both of these variable pitch structures require the variable pitch shaft to be connected to the blade, and the blade angle is adjusted through the variable pitch shaft. The design of the hub system is relatively complex, increasing the hub weight; the traditional blade structure design is to design the blade structure by adjusting the width in the chord length direction and the thickness in the direction perpendicular to the chord length of the cloth layer, and filling foam or support beams inside. This design structure cannot maximize the performance of the material itself, and only high-strength materials can be selected and the structure size can be increased to meet the requirements of blade strength and stiffness, which leads to an increase in production costs and material limitations.

[0004] Therefore, how to provide a blade structure with higher dynamic performance is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention aims to provide a flange-type tapered sleeve connection wind tunnel blade structure to at least partly solve one of the above technical problems in the prior art.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A flange-type tapered sleeve connection wind tunnel blade structure includes a blade body, a connecting member, and a flange tapered sleeve assembly;

[0008] The blade body includes a main support rib, a secondary support rib, a connecting structure I, and a skin; one end of the main support rib is a connecting end, and the other end diverges and extends towards the blade tip. The secondary support rib is wound and fixed along the circumferential side of the main support rib to form a blade frame structure. The connecting structure I is fixed at the connecting end of the main support rib, and the skin is wrapped and fixed on the blade frame structure;

[0009] Both ends of the connecting component respectively correspond to connecting structure two and connecting structure three. Connecting structure two is detachably connected to connecting structure one, and connecting structure three is detachably connected to the flange cone sleeve assembly and is fixed on the hub mounting plate through the flange cone sleeve assembly.

[0010] Preferably, in the above-mentioned flange cone sleeve connected wind tunnel blade structure, a positioning ring is sleeved and fixed outside the connecting end of the main support rib.

[0011] Preferably, in the above-mentioned flange cone sleeve connected wind tunnel blade structure, connecting structure one is multiple embedded metal blocks, and both ends are inverted wedges;

[0012] The main support rib includes multiple clusters of branch support ribs. The end of the branch support rib is a connecting block, and there is a wedge-shaped gap corresponding to the embedded metal block between the connecting blocks of adjacent branch support ribs. The other end is dispersed into multiple roots and extends towards the blade tip direction. Each connecting block is clamped and fixed by the wedge-shaped ends of two embedded metal blocks;

[0013] Connecting structure two is a limiting platform. The splicing surface of the limiting platform is provided with limiting grooves matching with multiple branch support ribs and is correspondingly clamped with them.

[0014] Preferably, in the above-mentioned flange cone sleeve connected wind tunnel blade structure, the connecting block of each branch support rib is located between two adjacent embedded metal blocks and is solidified by integral molding. The other end enters from the blade tip direction along the embedded metal block and extends to the blade tip position. The inner wall of the positioning ring corresponds to the outer wall of the solidified embedded metal block.

[0015] Preferably, in the above-mentioned flange cone sleeve connected wind tunnel blade structure, the extended sections of multiple branch support ribs are dispersed and extended to the blade tip. The auxiliary support ribs are wound around the outside of the branch support ribs to form a grid-like support structure, and the skin is wrapped on the working surface and non-working surface of the grid-like support structure.

[0016] Preferably, in the above-mentioned flange cone sleeve connected wind tunnel blade structure, connecting structure three is a disc structure, and the disc structure and the limiting platform are fixedly connected by a connecting rod.

[0017] Preferably, in the above-mentioned flange cone sleeve connected wind tunnel blade structure, the flange cone sleeve assembly is a flange plate structure formed by splicing. The edge of the flange plate structure is provided with an annular limiting protrusion, and a fitting hole is opened in the middle. The inner wall of the fitting hole forms a first conical surface;

[0018] The side wall surface of connecting structure three is a second conical surface adapted to the fitting hole and is fitted and clamped with it.

[0019] Preferably, in the above-described flange-type tapered sleeve connection wind tunnel blade structure, a limiting groove adapted to the limiting protrusion is provided on the outer edge of the hub mounting disc. The limiting protrusion of the flange tapered sleeve assembly is inserted into the limiting groove of the hub mounting disc. The third connection structure is engaged with the flange tapered sleeve assembly in alignment. Then, the flange tapered sleeve assembly and the hub mounting disc are fixed by bolts. The tapered surface one of the fitting hole presses against the tapered surface two of the third connection structure, and the rotation of the blade body in the axial direction is locked under the action of friction force.

[0020] As can be seen from the above technical solutions, compared with the prior art, the present invention discloses a flange-type tapered sleeve connection wind tunnel blade structure, and its main effects and advantages are as follows:

[0021] The grid-shaped support structure formed by the main support ribs and the auxiliary support ribs is used as the main load-bearing structure of the blade. It is formed separately from the skin, which is more convenient for production, and the mechanical properties of the product after forming are better, and it can meet more complex pitch-changing requirements and higher blade dynamic performance.

[0022] The requirements for materials are lower, the restrictions are fewer, and it is more conducive to cost savings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the drawings without creative efforts.

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a sectional view of the present invention;

[0026] Figure 3 It is a schematic diagram of the hub mounting disc interface in the present invention;

[0027] Figure 4 It is a schematic diagram of the structure of the flange tapered sleeve assembly in the present invention;

[0028] Figure 5 It is a sectional view of the flange tapered sleeve assembly in the present invention;

[0029] Figure 6 It is a schematic diagram of the structure of the connecting component in the present invention;

[0030] Figure 7 It is a sectional view of the connecting component in the present invention;

[0031] Figure 8It is a schematic structural diagram of the blade body in the present invention;

[0032] Figure 9 It is a schematic structural diagram of the embedded metal block in the present invention;

[0033] Figure 10 It is Figure 2 an enlarged schematic diagram of part A in

[0034] Figure 11 It is Figure 2 an enlarged schematic diagram of part K in Specific embodiments

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0037] In the present invention, unless otherwise clearly defined and limited, the terms "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Please refer to the attached Figure 1-11 , which is a flange-type tapered sleeve connection wind tunnel blade structure of the present invention, including a blade body 1, a connecting component 2, and a flange tapered sleeve assembly 3;

[0039] The blade body 1 includes a main support rib 10, an auxiliary support rib 11, a first connection structure 12, and a skin 13; one end of the main support rib 10 is a connection end, and the other end diverges and extends towards the blade tip. The auxiliary support rib 11 is wound and fixed along the circumferential side of the main support rib 10 to form a blade frame structure. The first connection structure 12 is fixed at the connection end of the main support rib 10, and the skin 13 is coated and fixed on the blade frame structure.

[0040] Both ends of the connection component 2 are respectively a second connection structure 20 and a third connection structure 21. The second connection structure 20 is detachably connected to the first connection structure, and the third connection structure 21 is detachably connected to the flange cone sleeve assembly 3 and is fixed on the hub mounting disc 4 through the flange cone sleeve assembly.

[0041] To further optimize the above technical solution, the hub mounting disc 4 is provided with flange holes for connecting the flange cone sleeve assembly 3 and is fixed on the hub positioning hole 50 of the hub 5 through the hub mounting disc 4.

[0042] To further optimize the above technical solution, a positioning ring 14 is sleeved and fixed outside the connection end of the main support rib 10 to restrict the radial movement of the embedded metal block.

[0043] To further optimize the above technical solution, the first connection structure 12 is composed of multiple embedded metal blocks, and both ends are inverted wedges, with a total of four.

[0044] The main support rib 10 includes three clusters of branch support ribs 100. The end of the branch support rib 100 is a connection block, and there is a wedge-shaped gap corresponding to the embedded metal block between the connection blocks of adjacent branch support ribs 100. The other end is dispersed into multiple roots and extends towards the blade tip. Each connection block is clamped and fixed by the wedge-shaped ends of two embedded metal blocks.

[0045] The second connection structure 20 is a limiting platform. The splicing surface of the limiting platform is provided with limiting grooves that cooperate with multiple branch support ribs 100 and are correspondingly clamped with them.

[0046] Specifically, for the embedded metal block fixed to the positioning ring 14, the contact surface with the inner wall of the positioning ring 14 is a matching arc surface, and the other side is a wedge-shaped surface corresponding to the branch support rib 100.

[0047] Specifically, the connection block of each branch support rib 100 is clamped and fixed by two adjacent embedded metal blocks, solidified by integral molding. The other end enters from the blade tip direction along the embedded metal block and extends to the blade tip position. The inner wall of the positioning ring 14 corresponds to the outer wall of the solidified embedded metal block.

[0048] To further optimize the above technical solution, the extended segments of multiple branch support ribs 100 are dispersedly extended to the blade tip. The auxiliary support rib 11 is wound around the outside of the branch support ribs 100 to form a grid-like support structure. The skin 13 wraps the working surface and the non-working surface of the grid-like support structure. The thickness of the skin 13 is adjusted according to the grid size and the aerodynamic force, and the thickness of the skin 13 can reach 0.5 mm.

[0049] To further optimize the above technical solution, the connecting structure three 21 is a disc structure, and the disc structure and the limiting platform are fixedly connected through a connecting rod 22.

[0050] Specifically, one end of the limiting platform is fixed to the connecting rod 22, the other end is square, and a plurality of strip-shaped protrusions are provided on the square end face. Inverted wedge-shaped limiting holes corresponding to the embedded metal blocks are opened on the strip-shaped protrusions.

[0051] To further optimize the above technical solution, the flange cone sleeve assembly 3 is a flange disk-like structure formed by splicing, and is composed of two semi-circular split cone sleeves 31. The inner ring wall of the split cone sleeve 31 is conical, a limiting protrusion is provided on the outer edge side thereof, and a plurality of flange holes are opened. After the two split cone sleeves 31 are spliced, a fitting hole is formed in the middle, and the inner wall of the fitting hole forms a complete conical surface one 30;

[0052] The outer edge of the hub mounting disc 4 is provided with a limiting groove adapted to the limiting protrusion. The limiting protrusion of the split cone sleeve 31 is embedded in the limiting groove of the hub mounting disc 4, and then the connecting structure three 21 is fixedly embedded in the fitting hole of the two split cone sleeves 31. When the split cone sleeve 31 and the hub mounting disc 4 are fixed through the flange holes and bolts, the connecting structure three 21 is restricted within the two split cone sleeves 31. The bolts are tightened with the threaded holes on the hub mounting disc 4, and the split cone sleeve 31 moves towards the center of rotation. The conical surface one 30 of the fitting hole presses the conical surface two 210 of the connecting structure three 21. Under the action of friction, the end face of the hub mounting disc 4 locks the rotation of the blade main body 1 in the axial direction, and locks the rotation of the blade in the axial direction under the action of friction.

[0053] Specifically, the difference between the blade structure in this solution and the traditional blade structure lies in:

[0054] In the traditional blade structure, the skin 13 or the main beam is used to bear the aerodynamic force and the centrifugal force, and all structures are integrally formed. In this solution, the main load-bearing structure of the blade structure is the grid-like support structure composed of the main support ribs 10 and the auxiliary support ribs 11, and the skin 13 only plays the role of ensuring the shape.

[0055] Specifically, the forming method of the blade structure in this solution is as follows: during forming, the skin 13 can be formed separately with the main support ribs 10 and the secondary support ribs 11 to form a grid-like support structure. After separate forming, the final product is formed through bonding. To improve the forming quality, one side of the working surface or the non-working surface can be selected to integrally form a grid-like support structure with the main support ribs 10 and the secondary support ribs 11. During forming, materials that can be heated and expanded, such as silica gel, are placed inside each grid. Through the support of the expanded materials, integral curing and forming are easily achieved. After forming, the heated and expanded materials are taken out, and the already produced skin 13 is bonded and cured with it.

[0056] The various embodiments in this specification are described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple. For related parts, reference can be made to the description in the method part.

[0057] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A flange-type tapered sleeve connection wind tunnel blade structure, characterized in that, It includes a blade body (1), a connecting component (2) and a flange cone sleeve assembly (3); the blade body (1) includes a main support rib (10), a secondary support rib (11), a first connecting structure (12) and a skin (13); one end of the main support rib (10) is a connecting end, and the other end diverges and extends towards the blade tip direction, the secondary support rib (11) is wound and fixed along the circumferential side of the main support rib (10) to form a blade frame structure, the first connecting structure (12) is fixed at the connecting end of the main support rib (10), and the skin (13) is wrapped and fixed on the blade frame structure; Both ends of the connecting component (2) are respectively a second connecting structure (20) and a third connecting structure (21), the second connecting structure (20) is detachably connected to the first connecting structure (12), the third connecting structure (21) is detachably connected to the flange cone sleeve assembly (3), and is fixed on the hub mounting disc (4) through the flange cone sleeve assembly (3); A positioning ring (14) is sleeved and fixed outside the connecting end of the main support rib (10); The first connecting structure (12) is multiple pre-embedded metal blocks, and both ends are inverted wedges; The main support rib (10) includes multiple clusters of branch support ribs (100), the end of the branch support rib (100) is a connecting block, and there are wedge-shaped gaps corresponding to the pre-embedded metal blocks between the connecting blocks of adjacent branch support ribs (100), and the other end is dispersed into multiple roots and extends towards the blade tip direction, and each connecting block is clamped and fixed by the wedge-shaped ends of two pre-embedded metal blocks; The second connecting structure (20) is a limiting platform, and the splicing surface of the limiting platform is provided with limiting grooves matching with multiple branch support ribs (100) and is correspondingly clamped with them; The connecting block of each branch support rib (100) is located between two adjacent pre-embedded metal blocks, and is integrally formed and cured, and the other end enters from the blade tip direction along the pre-embedded metal block and extends to the blade tip position, and the inner wall of the positioning ring (14) corresponds to the outer wall of the cured pre-embedded metal block.

2. The structure of the flange-type taper sleeve connecting the wind tunnel blade according to claim 1, characterized in that, The extended sections of multiple branch support ribs (100) are dispersed and extended to the blade tip, and the secondary support rib (11) is wound outside the branch support rib (100) to form a grid-like support structure, and the skin (13) is wrapped on the working surface and the non-working surface of the grid-like support structure.

3. The structure of a flange-type tapered sleeve connecting a wind tunnel blade according to claim 2, characterized in that, The third connecting structure (21) is a disc structure, and the disc structure and the limiting platform are fixedly connected by a connecting rod (22).

4. A flange-type tapered sleeve connection wind tunnel blade structure according to claim 3, characterized in that, The flange cone sleeve assembly (3) is a flange plate structure formed by splicing, the edge of the flange plate structure is provided with an annular limiting protrusion, and a fitting hole is opened in the middle, and the inner wall of the fitting hole forms a first conical surface (30); The side wall surface of the third connecting structure (21) is a second conical surface (210) adapted to the fitting hole and is fitted and clamped with it.

5. A flange-type tapered sleeve connection wind tunnel blade structure according to claim 4, characterized in that, The outer edge of the hub mounting plate (4) is provided with a limiting groove adapted to the limiting protrusion, the limiting protrusion of the flange cone sleeve assembly (3) is embedded in the limiting groove of the hub mounting plate (4), the connecting structure three (21) is aligned and embedded with the flange cone sleeve assembly (3), and then the flange cone sleeve assembly (3) and the hub mounting plate (4) are fixed by bolts, the conical surface one (30) of the embedding hole presses the conical surface two (210) of the connecting structure three (21), and locks the rotation of the blade body (1) in the axial direction under the action of friction force.

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