Wind power coupler suitable for high-speed shaft end of wind turbine generator

Abstract

The invention discloses a wind power coupling suitable for a high-speed shaft end of a wind turbine generator, which comprises a composite material intermediate pipe, and a flange I and a flange II which are arranged at two ends of the composite material intermediate pipe, and the composite material intermediate pipe is formed by winding and curing reinforced fiber yarn impregnated matrix resin; the two flanges are both arranged to be in an hourglass shape with the two ends large and the middle small, and the inner circumferential faces of the two ends of the composite material middle pipe are arranged to be in the shape matched with the hourglass-shaped flanges. After the wind power coupling is manufactured, the inner circumferential faces of the two ends of the composite material middle pipe are matched, contacted and meshed with the two hourglass-shaped flanges respectively, and an axial limiting structure is formed. The connecting strength between the middle pipe and the flange is jointly guaranteed through adhesive force and the axial limiting structure, the axial tension borne by the wind power coupler is resisted together, and therefore the quality of the wind power coupler is improved, and the service life of the wind power coupler is prolonged.

Description

Technical Field

[0001] The present invention relates to a wind power coupling, and in particular to a wind power coupling suitable for the high-speed shaft end of a wind turbine, belonging to the technical field of wind power coupling manufacturing. Background Art

[0002] The wind power coupling plays an important role in a wind turbine. Once overvoltage or overcurrent occurs, it will cause the entire wind turbine to exceed its tolerance limit and be punctured or burned out, resulting in high maintenance costs. The wind power coupling includes an intermediate tube and flanges located at both ends of the intermediate tube. The two ends of the wind power coupling are respectively connected to a generator and a wind power speed increasing gearbox through the flanges, and the intermediate tube of the wind power coupling plays an important role in torque transmission and insulation. There are two existing intermediate tube structures: First, a pure steel part is used as the intermediate tube, and then rubber parts and other insulation form components are used. This intermediate section structure not only has a heavy self-weight, but also a large moment of inertia, and the electrical insulation material grade is low, and the insulation effect is not good; Second, a glass fiber tube is used as the intermediate tube, and then the steel part and the glass fiber tube are bonded with glue.

[0003] The latter's glass fiber tube has the advantages of light weight, high strength, low price, good insulation performance, strong designability, etc., and is used to transmit torsional torque, achieve displacement compensation, insulate parasitic current, reduce vibration and absorb vibration energy. It has been widely used in the transmission field.

[0004] When manufacturing a wind power coupling with a glass fiber tube as the intermediate tube in the prior art, the glass fiber intermediate tube and two flanges are first manufactured separately, then an adhesive is applied to both ends of the glass fiber intermediate tube and the flanges, and then the two flanges are respectively inserted into both ends of the glass fiber intermediate tube, so as to bond and fix the glass fiber intermediate tube and the two flanges to form a wind power coupling. During manufacturing, one side of the flange and the inner peripheral surfaces at both ends of the glass fiber intermediate tube are set to a mutually matching conical structure, and the small end of the conical structure is located near the middle of the intermediate tube, and the large end of the conical structure is located near the end of the intermediate tube. However, this bonding method with a conical structure between the glass fiber intermediate tube and the flange has the problem of insufficient connection strength. Especially after using for a period of time, when the adhesive fails due to reasons such as adhesive material, process and aging, when the coupling is subjected to an axial tensile force, a structural debonding problem will occur, and the flange will break away from the glass fiber intermediate tube, resulting in the disintegration of the wind power coupling structure.

[0005] The Chinese utility model patent with the authorization announcement number CN201177015 and the authorization announcement date of January 7, 2009 discloses a flexible coupling for a wind turbine generator set, which includes: a circular body, flange plates arranged at both ends of the circular cylinder body, sleeve A and sleeve B respectively connected to one flange plate by bolts, rubber gaskets and elastic diaphragms respectively arranged between sleeve A and the flange plate, and between sleeve B and the flange plate. The circular cylinder body is a fiberglass circular cylinder body; each flange plate is also fixedly connected or integrally formed with a taper sleeve or a circular sleeve, and both ends of the fiberglass circular cylinder body are respectively sleeved and fixedly bonded or fixedly connected with one taper sleeve or circular sleeve.

[0006] The Chinese utility model patent with the authorization announcement number CN219673136U and the authorization announcement date of September 12, 2023 discloses a series torque limiter for a wind power coupling, which includes a fiberglass cylinder, a flange, a friction flange and a friction disc. Flanges are arranged on both inner sides of the fiberglass cylinder. The outer diameter of the flange on the right side is the same as the outer diameter of the fiberglass cylinder. The flange on the right side is fixedly connected to the pressure plate by a plurality of adjusting bolts B evenly distributed in the circumferential direction. A stepped ring A with a necking is arranged on the right end face of the flange on the right side, and a stepped ring B with a necking is arranged on the left end face of the pressure plate. The stepped ring A and the stepped ring B form an annular channel. The left disc of the friction flange is arranged in the annular channel, and the extended ring face on the right side of the friction flange is arranged on the outer circle surface of the pressure plate. The friction disc is fixed on the right side surfaces of the friction flange and the pressure plate. Friction discs C and A are respectively arranged between the corresponding stepped surfaces of the stepped ring A and the stepped ring B and the left disc of the friction flange. A friction disc B is arranged between the right stepped surface of the pressure plate and the left side surface of the friction disc.

[0007] It can be seen from the above two patent documents that the connection between the middle pipe and the flange is all carried out by using a bonding method with a conical structure. Therefore, there will also be a problem of insufficient connection strength. After using for a period of time, when the adhesive fails and the coupling is subjected to an axial tensile force, the flange will be disengaged from the middle pipe, and the structure of the wind power coupling will be disassembled.

[0008] In summary, how to design a wind power coupling applicable to the high-speed shaft end of a wind turbine generator set, so that it can enhance the connection strength between the middle pipe and the flange, and avoid the phenomenon that when the adhesive fails after using for a period of time and the coupling is subjected to an axial tensile force, the flange is disengaged from the middle pipe and the structure of the wind power coupling is disassembled, thereby improving the quality and service life of the wind power coupling is an urgent technical problem to be solved. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to provide a wind power coupling applicable to the high-speed shaft end of a wind turbine, aiming at the defects existing in the prior art. The connection strength between the intermediate pipe and the flange is enhanced, and the phenomenon that the flange disengages from the intermediate pipe and the structure of the wind power coupling disintegrates when the adhesive fails and the coupling is subjected to axial tension after being used for a period of time is avoided, thereby improving the quality and service life of the wind power coupling.

[0010] To solve the above technical problem, the technical solution adopted by the present invention is as follows: A wind power coupling applicable to the high-speed shaft end of a wind turbine includes a composite material intermediate pipe and flange one and flange two provided at both ends of the composite material intermediate pipe. The composite material intermediate pipe is formed by winding and curing reinforcing fiber yarn impregnated with matrix resin. Both flanges are set in a hourglass shape with large ends and a small middle. The inner peripheral surfaces at both ends of the composite material intermediate pipe are set in a shape matching the hourglass-shaped flange; when the wind power coupling is manufactured, the inner peripheral surfaces at both ends of the composite material intermediate pipe are respectively in contact and engaged with the two hourglass-shaped flanges to form an axial limiting structure.

[0011] Preferably, both flange one and flange two include a middle straight-edge ring body, an outer straight-edge ring body provided at one end of the middle straight-edge ring body, and an inner tapered ring body provided at the other end of the middle straight-edge ring body. One end of the middle straight-edge ring body is connected to one end of the outer straight-edge ring body, and the other end of the middle straight-edge ring body is connected to the small end of the inner tapered ring body; the outer diameter of the middle straight-edge ring body is set as D1, the outer diameter of the outer straight-edge ring body is set as D2, then D2 > D1, and the outer diameter of the large end of the inner tapered ring body is set as D3, then D3 > D1. The hourglass-shaped flange with large ends and a small middle is formed by the middle straight-edge ring body, the outer straight-edge ring body, and the inner tapered ring body.

[0012] Preferably, the inner peripheral surface of the composite material intermediate pipe includes a middle straight-edge peripheral surface, an end straight-edge peripheral surface one and an end straight-edge peripheral surface two respectively provided on both sides of the middle straight-edge peripheral surface. A tapered peripheral surface one is also provided between the end straight-edge peripheral surface one and the middle straight-edge peripheral surface, and a tapered peripheral surface two is also provided between the end straight-edge peripheral surface two and the middle straight-edge peripheral surface. One end of the end straight-edge peripheral surface one is connected to the small end of the tapered peripheral surface one, the large end of the tapered peripheral surface one is connected to one end of the middle straight-edge peripheral surface, the other end of the middle straight-edge peripheral surface is connected to the large end of the tapered peripheral surface two, and the small end of the tapered peripheral surface two is connected to one end of the end straight-edge peripheral surface two; After the wind power coupling is manufactured, the middle straight-edge ring body and the inner tapered ring body of flange one are respectively in mating contact with the end straight-edge peripheral surface one and the tapered peripheral surface one of the composite material intermediate pipe, and the middle straight-edge ring body and the inner tapered ring body of flange two are respectively in mating contact with the end straight-edge peripheral surface two and the tapered peripheral surface two of the composite material intermediate pipe to form an axial limiting structure.

[0013] Preferably, a lining pipe is further arranged between the two flanges and on the middle straight-edge peripheral surface of the composite material intermediate pipe. One end of the lining pipe is connected to the large-head end of the inner tapered ring body of flange one, and the other end of the lining pipe is connected to the large-head end of the inner tapered ring body of flange two.

[0014] Preferably, connecting ring bodies are further arranged at the small-head end parts of the inner tapered ring bodies of the two flanges, and a stepped part is arranged at the end part of the connecting ring body. When the lining pipe is assembled between the two flanges, the two ends of the lining pipe are respectively installed on the stepped parts of the two flanges, so that the lining pipe is assembled between the two flanges to form an integral structure.

[0015] Preferably, an uneven engagement structure is arranged between the inner peripheral surfaces at both ends of the composite material intermediate pipe and the mating contact surfaces with the two hourglass-shaped flanges.

[0016] Preferably, convex parts are arranged on the outer peripheral surfaces of the middle straight-edge ring bodies and the inner tapered ring bodies of the two flanges, and groove parts matching with the convex parts are arranged on the end straight-edge peripheral surface one, the tapered peripheral surface one, the end straight-edge peripheral surface two and the tapered peripheral surface two of the composite material intermediate pipe. The uneven engagement structure is formed by the mating contact between the convex parts and the groove parts. or Groove parts are arranged on the outer peripheral surfaces of the middle straight-edge ring bodies and the inner tapered ring bodies of the two flanges, and convex parts matching with the groove parts are arranged on the end straight-edge peripheral surface one, the tapered peripheral surface one, the end straight-edge peripheral surface two and the tapered peripheral surface two of the composite material intermediate pipe. The uneven engagement structure is formed by the mating contact between the convex parts and the groove parts.

[0017] Preferably, a plurality of convex parts and a plurality of groove parts are arranged. The plurality of convex parts are distributed in a staggered state, and the plurality of groove parts are also distributed in a staggered state.

[0018] Preferably, the convex part is a step, a ring or a pin.

[0019] Preferably, the groove part is a groove extending axially, radially or obliquely.

[0020] The beneficial effects of the present invention are as follows: The connection strength between the intermediate tube and the flange of the wind power coupling in the present invention is ensured not only by the impregnated matrix resin for adhesion, but also by the axial limiting structure formed by the composite material intermediate tube and the hourglass-shaped flange. That is to say, the connection strength between the intermediate tube and the flange of the wind power coupling in the present invention is jointly ensured by the adhesive force and the axial limiting structure to resist the axial tensile force borne by the wind power coupling together, avoiding the occurrence of the flange detaching from the intermediate tube and the structural disintegration of the wind power coupling when the adhesive fails and the coupling is subjected to axial tensile force after being used for a period of time, thereby improving the quality and service life of the wind power coupling. In addition, except for the impregnated matrix resin, no other adhesive is used, and there will be no influence on the coupling due to reasons such as adhesive materials, processes, and aging. An uneven engagement structure is designed between the inner peripheral surfaces at both ends of the composite material intermediate tube and the contact surfaces that cooperate with the two hourglass-shaped flanges respectively. One function of the uneven engagement structure is to increase the contact area between the inner peripheral surfaces at both ends of the composite material intermediate tube and the two hourglass-shaped flanges respectively on the premise of ensuring that the overall volume of the wind power coupling does not increase, which also increases the adhesive strength of the impregnated matrix resin. Another function is to increase the mechanical torsional resistance of the wind power coupling by using the mechanical structure formed by the uneven engagement structure, so that the present invention can utilize the resin adhesive force of the engagement structure and the mechanical force of mutual engagement to resist the torsional moment, making the wind power coupling have great torsional resistance, thereby being able to resist the continuously increasing torque action and further avoiding the occurrence of the structural disintegration of the wind power coupling, and further improving the quality and service life of the wind power coupling. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is the axial sectional structure schematic diagram of the wind power coupling in the embodiment of the present invention; Figure 2 is the axial sectional structure schematic diagram of the flange in the embodiment of the present invention; Figure 3 is the axial sectional structure schematic diagram of the composite material intermediate tube in the embodiment of the present invention; Figure 4 is the axial sectional structure schematic diagram when manufacturing the wind power coupling in the embodiment of the present invention Figure 1 ; Figure 5 is the axial sectional structure schematic diagram when manufacturing the wind power coupling in the embodiment of the present invention Figure 2 ; Figure 6 is the three-dimensional structure schematic diagram of the flange in the embodiment of the present invention; Figure 7 is Figure 2 the enlarged structure schematic diagram of part A in Figure 8 is Figure 4Schematic enlarged structure diagram of part B In the figure: 1. Composite material intermediate pipe; 2. First flange; 3. Second flange; 4. Middle straight-edge ring body; 5. Outer straight-edge ring body; 6. Inner conical ring body; 7. Middle straight-edge peripheral surface; 8. End straight-edge peripheral surface one; 9. End straight-edge peripheral surface two; 10. Conical peripheral surface one; 11. Conical peripheral surface two; 12. Liner pipe; 13. Winding tooling; 14. Protruding part; 15. Grooved part; 16. Connecting ring body; 161. Step part. Specific implementation mode

[0022] The technical solutions of the present invention will be further elaborated in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] Embodiment: As Figure 1 shown, a wind power coupling applicable to the high-speed shaft end of a wind turbine includes a composite material intermediate pipe 1 and first flange 2 and second flange 3 provided at both ends of the composite material intermediate pipe. The composite material intermediate pipe 1 is formed by winding and curing reinforcing fiber yarn impregnated with matrix resin. Both flanges are set in a hourglass shape with large ends and small middle. The inner peripheral surfaces at both ends of the composite material intermediate pipe 1 are set in a shape matching the hourglass-shaped flange; when the wind power coupling is manufactured, the inner peripheral surfaces at both ends of the composite material intermediate pipe 1 are respectively in contact and engaged with the two hourglass-shaped flanges to form an axial limiting structure. The reinforcing fiber yarn can be glass fiber yarn, polyester fiber or aramid fiber yarn, etc. For products that do not require insulation performance, carbon fiber yarn can also be used. The matrix resin can be thermosetting resins such as epoxy resin, unsaturated polyester, vinyl ester resin or phenolic resin and their corresponding curing agents. The matrix resin mentioned refers to the resin mixture that infiltrates the reinforcing fiber material during the winding process, and the mixture includes the matrix resin itself and the corresponding curing agent. In this embodiment, the reinforcing fiber yarn used is alkali-free glass fiber yarn, the matrix resin is epoxy resin, and the curing system is an acid anhydride curing system. After the wind power coupling in this embodiment is manufactured, the connection strength between the intermediate pipe and the flange is not only ensured by the impregnated matrix resin for adhesion, but also can be ensured by the axial limiting structure formed by the composite material intermediate pipe and the hourglass-shaped flange. That is to say, the connection strength between the intermediate pipe and the flange of the wind power coupling in this embodiment is jointly ensured by the adhesive force and the axial limiting structure, and together they resist the axial tension borne by the wind power coupling, avoiding the occurrence of the phenomenon that the flange detaches from the intermediate pipe and the structure of the wind power coupling disintegrates when the adhesive fails and the coupling is subjected to axial tension after being used for a period of time, thereby improving the quality and service life of the wind power coupling. In addition, except for the impregnated matrix resin, no other adhesive is used, and there will be no influence on the coupling due to adhesive materials, processes and aging, etc.

[0024] As Figures 1 to 3As shown, the first flange 2 and the second flange 3 both include a middle straight-edge ring body 4, an outer straight-edge ring body 5 provided at one end of the middle straight-edge ring body 4, and an inner tapered ring body 6 provided at the other end of the middle straight-edge ring body 4. One end of the middle straight-edge ring body 4 is connected to one end of the outer straight-edge ring body 5, and the other end of the middle straight-edge ring body 4 is connected to the small-end of the inner tapered ring body 6. The middle straight-edge ring body 4, the outer straight-edge ring body 5, and the inner tapered ring body 6 can be set as an integral structure. Set the outer diameter of the middle straight-edge ring body 4 as D1, set the outer diameter of the outer straight-edge ring body 5 as D2, then D2 > D1. Set the outer diameter of the large-end of the inner tapered ring body 6 as D3, then D3 > D1. An hourglass-shaped flange with large ends and a small middle is formed by the middle straight-edge ring body 4, the outer straight-edge ring body 5, and the inner tapered ring body 6.

[0025] The inner circumferential surface of the composite material intermediate pipe 1 includes a middle straight-edge circumferential surface 7, an end straight-edge circumferential surface one 8 and an end straight-edge circumferential surface two 9 respectively provided on both sides of the middle straight-edge circumferential surface 7. A tapered circumferential surface one 10 is also provided between the end straight-edge circumferential surface one 8 and the middle straight-edge circumferential surface 7, and a tapered circumferential surface two 11 is also provided between the end straight-edge circumferential surface two 9 and the middle straight-edge circumferential surface 7. One end of the end straight-edge circumferential surface one 8 is connected to the small-end of the tapered circumferential surface one 10, the large-end of the tapered circumferential surface one 10 is connected to one end of the middle straight-edge circumferential surface 7, the other end of the middle straight-edge circumferential surface 7 is connected to the large-end of the tapered circumferential surface two 11, and the small-end of the tapered circumferential surface two 11 is connected to one end of the end straight-edge circumferential surface two 9.

[0026] After the wind power coupling is manufactured, an axial limiting structure is formed by the middle straight-edge ring body 4 and the inner tapered ring body 6 of the first flange 2 respectively cooperating and contacting with the end straight-edge circumferential surface one 8 and the tapered circumferential surface one 10 of the composite material intermediate pipe 1, and by the middle straight-edge ring body 4 and the inner tapered ring body 6 of the second flange 3 respectively cooperating and contacting with the end straight-edge circumferential surface two 9 and the tapered circumferential surface two 11 of the composite material intermediate pipe 1.

[0027] As Figure 1 shown, a lining pipe 12 is also provided on the middle straight-edge circumferential surface 7 of the composite material intermediate pipe 1 between the two flanges. One end of the lining pipe 12 is connected to the large-end of the inner tapered ring body 6 of the first flange 2, and the other end of the lining pipe 12 is connected to the large-end of the inner tapered ring body 6 of the second flange 3. When manufacturing the wind power coupling in this embodiment, when assembling the composite material intermediate pipe and the two flanges, due to the setting of the above axial limiting structure, the flanges in this embodiment cannot be inserted from the end of the composite material intermediate pipe like in the prior art. Therefore, when manufacturing the wind power coupling in this embodiment, as Figure 2 shown, the two flanges are first processed according to the above structure, and then as Figure 4And Figure 5 As shown, the inner liner tube 12 is assembled between two flanges to form an integral structure, and then the two flanges and the inner liner tube 12 are sleeved onto the winding tooling 13. The winding tooling 13 is a cylindrical rotating body. Then, the entire winding tooling 13 is hoisted into the winding machine. One end of the winding tooling 13 is locked by the three-jaw chuck of the winding machine, and the other end of the winding tooling 13 is tightly aligned and pushed by the center drill of the winding machine. Finally, the reinforcing fiber yarn impregnated with the matrix resin is wound around the two flanges and the inner liner tube 12 by the winding machine to form the composite material intermediate tube 1, and after curing, the wind power coupling is finally manufactured.

[0028] There is also a problem in the prior art, that is, as the power of the wind turbine continuously increases, the swept area of its wind turbine blades also increases accordingly, and the torque transmitted by its blades also increases accordingly. In order to resist the continuously increasing torque, the current existing method is mainly to increase the bonding area between the intermediate tube and the flange. However, doing so will cause the glass fiber intermediate tube to continuously increase, and the coupling will also increase accordingly. In addition, when the adhesive between the intermediate tube and the flange of the existing wind power coupling ages and fails, when the coupling is subjected to a large torque, the flange will also break away from the intermediate tube, and the structure of the wind power coupling will disintegrate. Therefore, the applicant has made further improvements: that is, an uneven occluding structure is designed between the inner peripheral surfaces at both ends of the composite material intermediate tube 1 and the contact surfaces that cooperate with the two hourglass-shaped flanges respectively. One function of the uneven occluding structure is to increase the contact area between the inner peripheral surfaces at both ends of the composite material intermediate tube 1 and the two hourglass-shaped flanges respectively on the premise of ensuring that the overall volume of the wind power coupling does not increase, which also increases the adhesive strength of the impregnated matrix resin adhesive. Another function is to increase the mechanical torsional resistance of the wind power coupling by using the mechanical structure formed by the uneven occluding structure. Thus, in this embodiment, the resin adhesive force of the occluding structure and the mechanical force of mutual occlusion can be used to resist the torsional moment, so that the wind power coupling has great torsional resistance, can resist the continuously increasing torque, and further avoids the occurrence of the phenomenon of the wind power coupling structure disintegrating, thereby further improving the quality and service life of the wind power coupling.

[0029] As Figure 2 And Figure 3As shown, raised portions 14 are provided on the outer peripheral surfaces of the middle straight-edge ring body 4 and the inner tapered ring body 6 of the two flanges. Groove portions 15 matching the raised portions 14 are provided on the end straight-edge peripheral surface 8, the tapered peripheral surface 10, the end straight-edge peripheral surface 9, and the tapered peripheral surface 11 of the composite material intermediate pipe 1. The raised portions 14 and the groove portions 15 are cooperatively contacted to form the concave-convex engagement structure. Here, conversely, the raised portions 14 can be provided on the end straight-edge peripheral surface 8, the tapered peripheral surface 10, the end straight-edge peripheral surface 9, and the tapered peripheral surface 11 of the composite material intermediate pipe 1, and the groove portions 15 can be provided on the outer peripheral surfaces of the middle straight-edge ring body 4 and the inner tapered ring body 6 of the two flanges. The raised portions 14 can be designed into structures that are not conducive to rotation and twisting, such as steps, rings, or pins. The steps, rings, or pins can be protrusions of various shapes such as spherical, hemispherical, sharp-angled, or trapezoidal. The groove portions 15 can be axially extending, radially extending, or obliquely extending grooves, including various shapes and depths. During manufacturing, the raised portions or groove portions are first machined on the flanges, and then the corresponding groove portions or raised portions are formed on the composite material intermediate pipe by means of winding with a winding machine.

[0030] As Figure 6 shown, there are multiple raised portions 14 provided on the outer peripheral surfaces of the middle straight-edge ring body 4 and the inner tapered ring body 6 of the flanges. The multiple raised portions 14 are staggered on the outer peripheral surfaces of the middle straight-edge ring body 4 and the inner tapered ring body 6. Correspondingly, the groove portions 15 provided on the end straight-edge peripheral surface 8, the tapered peripheral surface 10, the end straight-edge peripheral surface 9, and the tapered peripheral surface 11 of the composite material intermediate pipe 1 are also staggered. In this way, the biting force formed by the concave-convex engagement structure can be further increased, thereby further increasing the mechanical torsional resistance of the wind power coupling.

[0031] As Figure 2 、 Figure 6 and Figure 7 shown, connection ring bodies 16 are further provided on the small-end ends of the inner tapered ring bodies 6 of the two flanges. Step portions 161 are provided on the ends of the connection ring bodies 16. As Figure 4 and Figure 8 shown, when the lining pipe 12 is assembled between the two flanges, the two ends of the lining pipe 12 are respectively installed on the step portions 161 of the two flanges, so that the lining pipe 12 is assembled between the two flanges to form an integral structure.

[0032] In summary, the connection strength between the intermediate pipe and the flange of the wind power coupling in the present invention is ensured not only by the impregnated matrix resin for adhesion, but also by the axial limiting structure formed by the composite material intermediate pipe and the hourglass-shaped flange. That is to say, the connection strength between the intermediate pipe and the flange of the wind power coupling in the present invention is jointly ensured by the adhesive force and the axial limiting structure to resist the axial tensile force borne by the wind power coupling together, avoiding the occurrence of the flange detaching from the intermediate pipe and the wind power coupling structure disintegrating when the adhesive fails and the coupling is subjected to axial tensile force after being used for a period of time, thereby improving the quality and service life of the wind power coupling. In addition, except for the impregnated matrix resin, no additional adhesive is used, and there will be no impact on the coupling due to reasons such as adhesive materials, processes, and aging. An uneven engagement structure is designed between the inner peripheral surfaces at both ends of the composite material intermediate pipe and the contact surfaces that respectively cooperate with the two hourglass-shaped flanges. One function of the uneven engagement structure is to increase the contact area between the inner peripheral surfaces at both ends of the composite material intermediate pipe and the two hourglass-shaped flanges on the premise of ensuring that the overall volume of the wind power coupling does not increase, which also increases the adhesive strength of the impregnated matrix resin. Another function is to increase the mechanical torsional resistance of the wind power coupling by using the mechanical structure formed by the uneven engagement structure. As a result, the present invention can use the resin adhesion force of the engagement structure and the mechanical force of mutual engagement to resist the torsional moment, enabling the wind power coupling to have great torsional resistance, thereby being able to resist the continuously increasing torque action and further avoiding the occurrence of the wind power coupling structure disintegrating phenomenon, and further improving the quality and service life of the wind power coupling.

[0033] The term "a plurality of" in the embodiments refers to a quantity of "two or more". The above embodiments are only for illustrating the present invention and not for limiting the present invention. Those skilled in the relevant technical fields can make various changes or transformations without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also fall within the protection scope of the present invention, and the protection scope of the present invention should be defined by each claim.

Claims

1. A wind power coupling suitable for high-speed shaft ends of wind turbines, comprising a composite intermediate tube and a flange 1 and a flange 2 arranged at both ends of the composite intermediate tube, wherein the composite intermediate tube is formed by winding and curing reinforced fiber yarn impregnated with a matrix resin, and is characterized in that: The two flanges are both set to be in an hourglass shape with large ends and a small middle. The inner circumferences at both ends of the composite intermediate tube are set to be in a shape matching the hourglass-shaped flanges. When the wind power coupling is manufactured, the inner circumferences at both ends of the composite intermediate tube are respectively matched with the two hourglass-shaped flanges to contact and engage with each other to form an axial limiting structure.

2. The wind power coupling according to claim 1, characterized in that: Both flange one and flange two include a middle straight-edge ring body, an outer straight-edge ring body arranged at one end of the middle straight-edge ring body, and an inner conical ring body arranged at the other end of the middle straight-edge ring body, one end of the middle straight-edge ring body is connected to one end of the outer straight-edge ring body, and the other end of the middle straight-edge ring body is connected to the small head end of the inner conical ring body; the outer diameter of the middle straight-edge ring body is set to D1, the outer diameter of the outer straight-edge ring body is set to D2, then D2>D1, the outer diameter of the large head end of the inner conical ring body is set to D3, then D3>D1, and an hourglass-shaped flange with large ends and small middle is formed by the middle straight-edge ring body, the outer straight-edge ring body and the inner conical ring body.

3. The wind power coupling according to claim 2, characterized in that: The inner circumference of the composite intermediate tube includes a middle straight edge circumference and an end straight edge circumference surface 1 and an end straight edge circumference surface 2 respectively arranged at two sides of the middle straight edge circumference, a tapered circumference surface 1 is further arranged between the end straight edge circumference surface 1 and the middle straight edge circumference, and a tapered circumference surface 2 is further arranged between the end straight edge circumference surface 2 and the middle straight edge circumference, one end of the end straight edge circumference surface 1 is connected to the small end end of the tapered circumference surface 1, the large end end of the tapered circumference surface 1 is connected to one end of the middle straight edge circumference, the other end of the middle straight edge circumference is connected to the large end end of the tapered circumference surface 2, and the small end end of the tapered circumference surface 2 is connected to one end of the end straight edge circumference surface 2; When the wind turbine coupling is manufactured, the middle straight-edge ring body and the inner conical ring body of flange one are respectively matched with the end straight-edge circumferential surface one and conical circumferential surface one of the composite intermediate tube, and the middle straight-edge ring body and the inner conical ring body of flange two are respectively matched with the end straight-edge circumferential surface two and conical circumferential surface two of the composite intermediate tube to form an axial limiting structure.

4. The wind power coupling according to claim 3, characterized in that: An inner liner pipe is also arranged between the two flanges and on the middle straight edge circumference of the composite intermediate pipe. One end of the inner liner pipe is connected to the big head end of the inner conical ring body of flange one, and the other end of the inner liner pipe is connected to the big head end of the inner conical ring body of flange two.

5. The wind power coupling according to claim 4, characterized in that: A connecting ring body is also provided on the small head end of the inner conical ring body of the two flanges, and a step portion is provided on the end of the connecting ring body; when the liner pipe is assembled between the two flanges, the two ends of the liner pipe are respectively installed on the step portions of the two flanges, so that the liner pipe is assembled between the two flanges to form an integrated structure.

6. The wind power coupling according to any one of claims 1 to 5, characterized in that: Concave-convex bite structures are arranged between the inner circumferential surfaces at both ends of the composite material intermediate tube and the matching contact surfaces of the two hourglass-shaped flanges.

7. The wind power coupling according to claim 6, characterized in that: The outer circumferences of the straight-edge ring body in the middle of the two flanges and the inner conical ring body are both provided with raised parts, and the straight-edge circumference 1 and conical circumference 1 at the end of the composite intermediate tube and the straight-edge circumference 2 and conical circumference 2 at the end are both provided with grooves matching the raised parts; the concave-convex bite structure is formed by the matched contact between the raised parts and the groove parts or Grooved portions are arranged on the outer circumferences of the middle straight-edge ring body and the inner conical ring body of the two flanges, and raised portions matching the grooved portions are arranged on the end straight-edge circumference 1 and conical circumference 1 as well as the end straight-edge circumference 2 and conical circumference 2 of the composite intermediate tube; the concave-convex bite structure is formed by the mating contact between the raised portions and the grooved portions.

8. The wind power coupling according to claim 7, characterized in that: A plurality of the protrusions and grooves are provided, and the plurality of protrusions are distributed in a staggered state, and the plurality of grooves are also distributed in a staggered state.

9. The wind power coupling according to claim 7, characterized in that: The protrusion is a step, a ring or a pin.

10. The wind power coupling according to claim 7, characterized in that: The groove portion is a groove extending axially, radially or obliquely.

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