Rotor lead fixing structure suitable for doubly-fed wind generator

Abstract

The utility model discloses a rotor lead fixing structure suitable for a doubly-fed wind generator, which comprises a central ring sleeved on a main shaft, a star-shaped central ring inner support ring sleeved on the outer wall of the central ring, and one end of a fan blade fixedly mounted on the outer wall of the star-shaped central ring inner support ring. The other ends of the fan blades are fixedly mounted on the inner wall of the star-shaped center ring outer supporting ring, and a plurality of rotor leads are mounted on the outer wall of the star-shaped center ring outer supporting ring in a riveting and welding double-fixing manner; according to the invention, twisting and welding processes at the joint of the rotor outgoing line and the center ring are canceled, the risk of fracture is reduced, and the safety of the whole structure is significantly improved. And the bent part of the rotor lead adopts a smooth transition fillet design, and the innovation further enhances the durability of the structure through double reinforcement. In addition, the fan blades are elaborately designed, the stable operation of the generator is ensured by improving the fastening effect and enhancing the heat dissipation performance, and the service life of the generator is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field, in particular to a rotor lead fixing structure suitable for a double-fed wind generator. Background Art

[0002] In the design and manufacture of modern generators, the layout and material selection of the rotor end leads have always been crucial technical links. However, the common practice of the current generator rotor end leads is to twist the copper bar 90° and then bend it. However, the twisting and bending process of the copper bar will cause stress concentration inside the material. These stresses will gradually accumulate during the long-term operation of the copper bar, eventually causing fatigue and fracture of the copper bar. Secondly, defects in the welding position of the copper bar are also one of the important reasons for the fracture. During the welding process, if the welding process is improper or the welding material is improperly selected, cracks, slag inclusions and other defects may occur at the welding position. These defects will weaken the bearing capacity of the copper bar, making it easy to break when subjected to external forces. In addition, when the copper bar is fixed on the shaft, it is also easy to cause the copper bar to break due to the action of the rotating centrifugal force. If the fixing method is unreasonable or the strength of the fixing is insufficient, the copper bar may be deformed or broken under the action of centrifugal force.

[0003] Therefore, in response to the above problems, how to change the lead fixing structure and strengthen the cooling and heat dissipation of the rotor end has become a technical problem that needs to be solved urgently. Utility Model Content

[0004] The utility model aims to provide a rotor lead fixing structure suitable for a doubly-fed wind generator to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a rotor lead fixing structure suitable for a doubly fed wind turbine, comprising a center ring sleeved on a main shaft, the outer wall of the center ring being sleeved with a star-shaped center ring inner support ring, one end of a fan blade being fixedly mounted on the outer wall of the star-shaped center ring inner support ring, the other end of the fan blade being fixedly mounted on the inner wall of the star-shaped center ring outer support ring, and a plurality of rotor leads being installed on the outer wall of the star-shaped center ring outer support ring by dual fixing by riveting and welding.

[0006] Preferably, insulating material is filled and cured between the rotor lead wire and the outer support ring of the star-shaped center ring.

[0007] Preferably, the inner support ring of the star-shaped center ring and the outer support ring of the star-shaped center ring are both made of high-strength and wear-resistant alloy material.

[0008] Preferably, the specifications of the rotor leads are selected according to the unit configuration, and the sizes of the star-shaped center ring inner support ring and the star-shaped center ring outer support ring are designed according to the generator configuration and the main shaft and end sizes.

[0009] Preferably, the bent portion of the rotor lead adopts a specially designed rounded corner with smooth transition.

[0010] Compared with the prior art, the beneficial effects of the utility model are as follows: the present application successfully eliminates the torsion and welding process at the connection between the rotor lead wire and the center ring, greatly reducing the risk of fracture and significantly improving the safety of the overall structure. The inner and outer support rings carefully made of high-strength alloy materials can not only effectively cope with vibration and impact, but also ensure the stability and durability of the structure. The design of the rotor lead wire and the support ring fully considers the actual configuration requirements of the unit, ensures the adaptability of the structure, and lays a solid foundation for the stable operation of the generator. And in the bending part of the rotor lead wire, we adopt a smooth transition fillet design. This innovation not only reduces stress concentration, but also further enhances the durability of the structure through double reinforcement. In addition, the fan blades are carefully designed to ensure the stable operation of the generator and extend its service life by improving the fastening effect and enhancing the heat dissipation performance.

[0011] In summary, the rotor lead fixing structure provided by the utility model not only successfully solves the problems in the traditional design, but also significantly improves the reliability and stability of the generator and reduces the maintenance cost. This innovation is of great significance to the sustainable development and technological progress of the wind power industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the utility model.

[0013] In the figure: 1. rotor lead, 2. inner support ring of star-shaped center ring, 3. fan blades, 4. outer support ring of star-shaped center ring. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0015] See also Figure 1The utility model provides a technical solution: a rotor lead fixing structure suitable for a doubly fed wind turbine generator, comprising a center ring sleeved on the main shaft, the outer wall of the center ring is sleeved with a star-shaped center ring inner support ring 2, the outer wall of the star-shaped center ring inner support ring 2 is fixedly installed with one end of a blade 3, and the other end of the blade 3 is fixedly installed on the inner wall of the star-shaped center ring outer support ring 4, and the outer wall of the star-shaped center ring outer support ring 4 is fixed with a plurality of rotor leads 1 by riveting and welding dual fixing. Through this design, the connection between the rotor lead and the center ring is free from torsion, and the fillet is smoothly transitioned to the support, avoiding the rotor lead from reversing 90° and then bending and connecting to the center ring by welding, fundamentally solving the problem of the rotor lead and the center ring being broken by the copper bar due to poor welding process and the centrifugal force of the rotor rotation, and through the blades installed between the two support rings, the concept of combining the fan and the support is adopted, which can not only improve the fastening of the rotor lead center ring but also achieve the effect of heat dissipation and cooling.

[0016] As a preferred solution, further, the space between the rotor lead wire 1 and the outer support ring 4 of the star-shaped center ring is filled with solidified insulating material, specifically including insulating pads and felt impregnated with insulating paint.

[0017] As a preferred solution, further, the star-shaped center ring inner support ring 2 and the star-shaped center ring outer support ring 4 are both made of high-strength and wear-resistant alloy materials to cope with the strong vibration and impact generated by the wind turbine during operation.

[0018] As a preferred solution, further, the specifications of the rotor lead 1 are selected according to the unit configuration, and the sizes of the star-shaped center ring inner support ring 2 and the star-shaped center ring outer support ring 4 are designed according to the generator configuration and the main shaft and end sizes.

[0019] As a preferred solution, further, the bent portion of the rotor lead 1 adopts a specially designed smooth transition fillet, which can reduce the stress concentration caused by bending, thereby reducing the risk of the rotor lead 1 breaking during the operation of the wind turbine.

[0020] The detailed connection means are well-known in the art. The present application has the following significant advantages. First, by eliminating the torsion and welding at the connection between the rotor lead wire and the center ring, stress concentration and welding defects are reduced, thereby greatly reducing the risk of rotor lead wire and center ring breakage. At the same time, the inner and outer support rings of the star-shaped center ring made of high-strength and wear-resistant alloy materials not only ensure the stability of the structure, but also effectively deal with the strong vibration and impact generated by the wind turbine during operation.

[0021] In addition, the specifications of the rotor lead and the dimensions of the two support rings are designed according to the specific unit configuration and generator requirements to ensure the matching and adaptability of the entire structure. In particular, the curved part of the rotor lead adopts a specially designed smooth transition fillet, which significantly reduces the stress concentration caused by bending. The durability and reliability of the rotor lead are further enhanced by using double reinforcement methods such as bolt silver copper welding and rivet riveting.

[0022] Furthermore, the fan blade design installed between the two support rings not only improves the fastening effect of the rotor lead center ring, but also enhances the heat dissipation and cooling effect. During the operation of the wind turbine, the fan blades can rotate with the rotation of the rotor, thereby generating wind flow, effectively taking away the heat around the center ring, reducing the temperature rise and ensuring the stable operation of the generator.

[0023] In summary, the utility model provides a rotor lead fixing structure suitable for a doubly-fed wind generator, which solves the problems existing in the traditional structure through a unique design and optimized material selection, improves the reliability and stability of the generator, and reduces maintenance costs, which is of great significance to the development of the wind power industry.

[0024] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "center position", "other end", "upper", "one side", "top", "inside", "front", "center", "two ends" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are 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; at the same time, unless otherwise clearly specified and limited, the terms "snapping", "plugging", "welding", "installation", "setting", "interference fit", "screw connection", "pin connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, for ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rotor lead fixing structure suitable for a doubly-fed wind turbine generator, comprising a center ring sleeved on a main shaft, characterized in that: The outer wall of the center ring is sleeved with a star-shaped center ring inner support ring (2), one end of a fan blade (3) is fixedly mounted on the outer wall of the star-shaped center ring inner support ring (2), and the other end of the fan blade (3) is fixedly mounted on the inner wall of the star-shaped center ring outer support ring (4), and a plurality of rotor leads (1) are installed on the outer wall of the star-shaped center ring outer support ring (4) by dual fixing by riveting and welding.

2. The rotor lead fixing structure applicable to a doubly-fed wind generator according to claim 1, characterized in that: Insulating material is filled and cured between the rotor lead wire (1) and the star-shaped center ring outer support ring (4).

3. The rotor lead fixing structure applicable to a doubly-fed wind generator according to claim 1, characterized in that: The star-shaped center ring inner support ring (2) and the star-shaped center ring outer support ring (4) are both made of high-strength and wear-resistant alloy material.

4. The rotor lead fixing structure applicable to a doubly-fed wind generator according to claim 1, characterized in that: The specifications of the rotor lead wire (1) are selected according to the configuration of the unit, and the sizes of the star-shaped center ring inner support ring (2) and the star-shaped center ring outer support ring (4) are designed according to the configuration of the generator and the dimensions of the main shaft and the end.

5. The rotor lead fixing structure applicable to a doubly-fed wind generator according to claim 1, characterized in that: The bent portion of the rotor lead (1) adopts a specially designed rounded corner with smooth transition.

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