High-reliability doubly-fed wind power generator

Abstract

The application discloses a high-reliability doubly-fed wind-driven generator, and particularly relates to the technical field of wind power generation, which comprises a base, a rotating shaft, a front rolling bearing, a rear rolling bearing, a rotor, a stator, a cooling mechanism and an end cover. The cooling mechanism is arranged, which can avoid the continuous operation of the cooling system, greatly reduce the energy consumption of auxiliary equipment under the light load or low temperature working condition of the motor, realize the precise and efficient use of energy, save the energy to the maximum extent while ensuring the heat dissipation effect and improving the reliability of the equipment, and form forced convection of air at both ends of the rotor, form a targeted heat dissipation channel, help to reduce local hot spots, make the temperature distribution in the generator more uniform, thereby reduce thermal stress, and improve the overall structural stability and service life.

Description

Technical Field

[0001] This application relates to the field of wind power generation technology, and more specifically, to a highly reliable doubly-fed wind turbine. Background Technology

[0002] A doubly-fed induction generator (DFIG) is a power generation device that efficiently converts wind energy into electrical energy. Through its unique doubly-fed technology, it enables the generator to maintain high-efficiency operation under varying wind speeds. DFIG is one of the most widely used technologies in the wind power industry. Its core advantage lies in achieving efficient energy conversion through a partial power converter, while simultaneously balancing cost and performance.

[0003] However, the following problems still exist: 1. The rotor lead wires are generally fixed by cable grouting. This process has high requirements and is prone to cracking of grout and loosening and falling off of cables under high temperature and high speed conditions, which may lead to a major risk of machine shutdown. 2. The rotor coil support structure and integral end clamps severely obstruct end ventilation, resulting in low heat dissipation efficiency, excessive rotor temperature rise, and affecting the insulation life and operational reliability of the motor. 3. The overall mechanical balancing process must rely on detachable process end caps, which require repeated disassembly and assembly. This not only greatly increases the complexity and time of production assembly, but also introduces human error and additional costs. 4. Traditional wind deflectors are mostly spliced ​​structures with poor sealing, resulting in serious air leakage. This damages the integrity of the internal cooling airflow of the motor and reduces cooling efficiency.

[0004] This application provides a high-reliability doubly-fed wind turbine generator, which aims to solve the above-mentioned problems. Utility Model Content

[0005] The purpose of this application is to provide a highly reliable doubly-fed wind turbine to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this application provides the following technical solution: a high-reliability doubly-fed wind turbine generator, comprising a frame, a shaft, a front rolling bearing, a rear rolling bearing, a rotor, a stator, a cooling mechanism, and end covers, and further comprising: A conductive connection structure is disposed inside the rotating shaft to realize the electrical connection between the lead wires on the rotor and the external slip ring brush holder; A rotor pressure ring is fixed to the rotor, and the rotor pressure ring is provided with a balance groove for mounting a balance block; A balance ring, which is disposed on the rotating shaft, is used for overall dynamic balancing; The cooling mechanism is used to intelligently control the flow direction and intensity of the cooling airflow based on the internal temperature of the generator, so as to dissipate heat at both ends of the rotor.

[0007] Preferably, the conductive connection structure includes a conductive rod and a conductive bar. The conductive bar is fixedly connected to the rotating shaft. The conductive rod passes through the shaft hole of the rotating shaft, with one end connected to the lead wire and the other end connected to the conductive bar. The other end of the conductive bar is connected to the slip ring brush holder.

[0008] Preferably, the conductive rod is provided with threads for fixing one end of the lead wire to the conductive rod by a nut, and the other end of the lead wire is fixed to the rotor by the rotor pressure ring.

[0009] Preferably, the conductive busbar is wrapped with an insulating layer and inserted into the shaft hole of the rotating shaft for fixation.

[0010] Preferably, the end cap has a balance block mounting port, and a detachable outer cover is provided at the balance block mounting port.

[0011] Preferably, it also includes a wind deflector, which is an integral structure and is fixed to the base by a wind deflector connecting plate and a pressure plate.

[0012] Preferably, the rotor is fixedly connected to the rotating shaft, the stator is fixedly connected to the machine base, the rotor adopts a fanless design, and the ends of the rotor are provided with segmented end clamps to improve the ventilation efficiency of the rotor ends.

[0013] Preferably, the cooling mechanism includes a cooling cover and a heat dissipation fan. The cooling cover is provided with a first heat dissipation chamber, a second heat dissipation chamber and a third heat dissipation chamber. A guide fan is provided in the second heat dissipation chamber to control the airflow direction according to the internal temperature of the base.

[0014] Preferably, the cooling cover has an air inlet on the side away from the heat dissipation fan, and the air inlet is provided with a drive device for controlling the opening and closing of the air inlet.

[0015] Preferably, the balance ring is located at the original fan mounting position.

[0016] The technical effects and advantages of this application are as follows: 1. The rotor of this application does not have a fan or balance ring. The balance groove is integrated on the rotor pressure ring, which effectively shortens the shaft length, reduces weight and rotor mechanical noise. The rotor lead wire adopts a conductive rod structure, which makes the generator more reliable under high speed conditions and avoids the risks of grouting. The base has a split wind baffle and an integrated end cover, which reduces the difficulty of generator assembly and reduces production costs. 2. This application, through the setting of the cooling mechanism, when the internal temperature of the base exceeds a set threshold, the guide fan will blow air towards the middle of the rotor, forming convection with the air at both ends of the rotor. This concentrates the circulating air at both ends of the rotor, and the low-temperature air flowing in the first, second, and third heat dissipation chambers carries away the heat from the air at both ends of the rotor, reducing the heat of the air at both ends of the rotor and improving the heat dissipation effect at both ends of the rotor. On the one hand, it can avoid the continuous operation of the cooling system, greatly reducing the energy consumption of auxiliary equipment under light load or low temperature conditions of the motor, and realizing precise and efficient use of energy. While ensuring the heat dissipation effect and improving the reliability of the equipment, it saves energy to the maximum extent. On the other hand, it can make the air flow at both ends of the rotor form forced convection, forming a targeted heat dissipation channel, which helps to reduce local hot spots, making the internal temperature distribution of the generator more uniform, thereby reducing thermal stress and improving the overall structural stability and service life. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this application.

[0018] Figure 2 This is a partial sectional view of the interior of the base of this application.

[0019] Figure 3 This is a schematic diagram of the end cap structure of this application.

[0020] Figure 4 This is a cross-sectional view of the conductive connection structure portion of this application.

[0021] Figure 5 For this application Figure 2 Enlarged view of the structure of part I.

[0022] Figure 6 This is a schematic diagram of the outer cover structure of this application.

[0023] Figure 7 This is a schematic diagram of the primary heat dissipation air circulation state in this application.

[0024] Figure 8 This is a schematic diagram of the forced cooling air circulation state of this application.

[0025] The attached diagram is labeled as follows: 1. Rotating shaft; 2. Front rolling bearing; 3. Rear rolling bearing; 4. Rotor; 5. Stator; 6. Cooling mechanism; 61. Cooling cover; 611. First heat dissipation chamber; 612. Second heat dissipation chamber; 613. Third heat dissipation chamber; 62. Cooling fan; 63. Air inlet; 7. Conductive rod; 8. Conductive busbar; 9. Baffle plate; 10. Rotor pressure ring; 11. Balance ring; 12. End cover; 13. Outer cover; 14. Baffle connecting plate; 15. Pressure plate; 20. Base; 30. Electrical connection chamber. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] Example 1 refer to Figures 1 to 8 A high-reliability doubly-fed wind turbine generator according to an embodiment of this application includes a frame 20, a shaft 1, a front rolling bearing 2, a rear rolling bearing 3, a rotor 4, a stator 5, a cooling mechanism 6, and an end cover 12. The frame 20 is made of steel plate structure, and the shaft 1 is rotatably connected to the frame 20 through the front rolling bearing 2 and the rear rolling bearing 3.

[0028] refer to Figure 2 and Figure 4 It also includes a conductive connection structure, which is set inside the rotating shaft 1 to realize the electrical connection between the lead wire on the rotor 4 and the external slip ring brush holder. The conductive connection structure includes a conductive rod 7 and a conductive busbar 8. The conductive busbar 8 is fixedly connected to the rotating shaft 1. The conductive rod 7 passes through the shaft hole of the rotating shaft 1. One end of it is connected to the lead wire, and the other end is connected to the conductive busbar 8. The other end of the conductive busbar 8 is connected to the slip ring brush holder. An electrical connection chamber 30 is provided on the side of the base 20 near the conductive connection structure. The slip ring brush holder is set inside the electrical connection chamber 30. The conductive rod 7 is threaded to fix one end of the lead wire to the conductive rod 7 with a nut. The other end of the lead wire is fixed to the rotor 4 by the rotor pressure ring 10. The conductive busbar 8 is wrapped with an insulating layer and inserted into the shaft hole of the rotating shaft 1 for fixation.

[0029] This combination of conductive rod 7 and conductive busbar 8 replaces the traditional cable grouting method, achieving a reliable connection through mechanical locking, and fundamentally avoiding the risk of cable detachment during high-speed operation.

[0030] refer to Figures 1 to 4 The rotor 4 is fixedly connected to the rotating shaft 1, and the stator 5 is fixedly connected to the base 20. The rotor 4 adopts a fanless design, which reduces rotating parts, mechanical noise and wind wear. The ends of the rotor 4 are provided with segmented end clamps, which increases the ventilation area and improves the end heat dissipation efficiency.

[0031] refer to Figure 2 , Figure 3 and Figure 6It also includes a rotor pressure ring 10 and a balance ring 11. The rotor pressure ring 10 is fixed on the rotor 4. The rotor pressure ring 10 is provided with a balance groove for installing balance blocks to achieve dynamic balance of the rotor 4 itself. The balance ring 11 is set at the original fan position of the rotating shaft 1 for overall dynamic balance. The end cover 12 is provided with a balance block mounting port and a detachable outer cover 13 is provided at the balance block mounting port.

[0032] When performing dynamic balancing of rotor 4, a balance block is installed in the balance groove of rotor pressure ring 10; when performing whole-body dynamic balancing, only the outer cover 13 needs to be removed to install a balance block on the balance ring 11 without disassembling the entire end cover 12. This split-type balancing design simplifies the dynamic balancing process and improves production efficiency.

[0033] refer to Figure 2 and Figure 5 It also includes a wind deflector 9, which is an integral structure and is fixed to the base 20 by a wind deflector connecting plate 14 and a pressure plate 15.

[0034] The integrated wind deflector 9 eliminates the seams of traditional splicing structures, effectively preventing air leakage and ensuring the integrity and efficiency of the cooling airflow.

[0035] In summary, the rotor 4 of this application does not have a fan or balance ring 11, and the balance groove is integrated on the rotor pressure ring 10, which effectively shortens the shaft length, reduces weight, and reduces the mechanical noise of the rotor 4; the lead wire of the rotor 4 adopts a conductive rod 7 structure, which makes the generator more reliable under high speed conditions and avoids the risks caused by grouting; the frame 20 has a split wind baffle 9 and an integrated end cover 12, which reduces the difficulty of generator assembly and reduces production costs.

[0036] Example 2 In actual operation, due to the structure of rotor 4, the temperature at both ends is higher than that in the middle. Under different operating conditions of rotor 4, especially under supersynchronous power generation, the temperature at both ends of rotor 4 is much higher than that in the middle. This will cause uneven heat distribution in rotor 4, resulting in severe uneven thermal expansion, which will affect the dynamic balance and conductive connection structure of rotor 4. Therefore, this embodiment improves the device described in the above embodiment.

[0037] refer to Figure 2 , Figure 7 and Figure 8 The cooling mechanism 6 is mounted on the base 20 and includes a cooling cover 61 and a cooling fan 62. The cooling cover 61 is provided with heat dissipation fins. An air inlet 63 is opened on the side of the cooling cover 61 away from the cooling fan 62. A drive device for controlling the opening and closing of the air inlet 63 is provided at the air inlet 63. A temperature sensor is installed inside the base 20. Both the temperature sensor and the cooling mechanism 6 are electrically connected to the controller.

[0038] refer to Figure 7 and Figure 8 The cooling cover 61 is provided with a first heat dissipation chamber 611, a second heat dissipation chamber 612, and a third heat dissipation chamber 613. The first heat dissipation chamber 611 and the third heat dissipation chamber 613 are located at both ends of the rotor 4, and the second heat dissipation chamber 612 is located in the middle of the rotor 4. A guide fan is provided inside the second heat dissipation chamber 612.

[0039] During actual operation, the internal temperature of the base 20 is detected by a temperature sensor. When the detected temperature is lower than the threshold set by the temperature sensor, the air inlet 63 is closed, and the cooling fan 62 and the guide fan are closed. At this time, the rotor 4 in the working state will rotate inside the base 20, driving the air to circulate in the base 20 and the first heat dissipation chamber 611, the second heat dissipation chamber 612 and the third heat dissipation chamber 613. The heat is initially dissipated through the heat dissipation fins on the cooling cover 61, and the heat generated by the rotor 4 and the stator 5 is carried away.

[0040] When the detected temperature exceeds the temperature sensor's set threshold, the air inlet 63 is opened, and the cooling fan 62 and the guide fan are started for forced air cooling. The guide fan blows air towards the middle of the rotor 4 and then towards both ends of the rotor 4. At this time, the rotor 4 in operation will cause the air at both ends to form convection with the air blown towards the middle by the guide fan, so that the circulating air is concentrated at both ends of the rotor 4. At this time, the low-temperature external air will enter the cooling cover 61 from the air inlet 63, and then enter the cooling fan 62 through the first heat dissipation chamber 611, the second heat dissipation chamber 612 and the third heat dissipation chamber 613 and be discharged. The cold air flows in the first heat dissipation chamber 611, the second heat dissipation chamber 612 and the third heat dissipation chamber 613. During the process, the hot air at both ends of rotor 4 will flow and absorb the heat of the hot air at both ends of rotor 4, thereby reducing the heat of the air at both ends of rotor 4 and improving the heat dissipation effect at both ends of rotor 4. On the one hand, it can avoid the continuous operation of the cooling system, greatly reducing the energy consumption of auxiliary equipment under light load or low temperature conditions of the motor, realizing the precise and efficient use of energy. While ensuring the heat dissipation effect and improving the reliability of the equipment, it saves energy to the maximum extent. On the other hand, it can make the air flow at both ends of rotor 4 form forced convection, forming targeted heat dissipation channels, which helps to reduce local hot spots, make the internal temperature distribution of the generator more uniform, thereby reducing thermal stress and improving the overall structural stability and lifespan.

[0041] In summary, by configuring the cooling mechanism 6, when the internal temperature of the base 20 exceeds a set threshold, the guide fan will blow air towards the middle of the rotor 4, forming convection with the air at both ends of the rotor 4. This concentrates the circulating air at both ends of the rotor 4, and the low-temperature air flowing within the first heat dissipation chamber 611, the second heat dissipation chamber 612, and the third heat dissipation chamber 613 carries away the heat from the air at both ends of the rotor 4, reducing the heat of the air at both ends of the rotor 4 and improving the heat dissipation effect at both ends of the rotor 4. On the one hand, this avoids the continuous operation of the cooling system, greatly reducing the energy consumption of auxiliary equipment under light load or low temperature conditions of the motor, and achieving precise and efficient use of energy. While ensuring the heat dissipation effect and improving the reliability of the equipment, it saves energy to the maximum extent. On the other hand, it enables the airflow at both ends of the rotor 4 to form forced convection, creating targeted heat dissipation channels, which helps to reduce local hot spots, making the internal temperature distribution of the generator more uniform, thereby reducing thermal stress and improving the overall structural stability and lifespan.

[0042] Finally: The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A high-reliability doubly-fed wind turbine generator, comprising a frame (20), a shaft (1), a front rolling bearing (2), a rear rolling bearing (3), a rotor (4), a stator (5), a cooling mechanism (6), and an end cover (12), characterized in that, Also includes: A conductive connection structure is provided inside the rotating shaft (1) to realize the electrical connection between the lead wire on the rotor (4) and the external slip ring brush holder; A rotor pressure ring (10) is fixed to the rotor (4), and the rotor pressure ring (10) is provided with a balance groove for installing a balance block; A balance ring (11) is disposed on the rotating shaft (1) for overall dynamic balancing; The cooling mechanism (6) is used to intelligently control the flow direction and intensity of the cooling air path according to the internal temperature of the generator, so as to dissipate heat at both ends of the rotor (4).

2. The high-reliability doubly-fed wind turbine generator according to claim 1, characterized in that: The conductive connection structure includes a conductive rod (7) and a conductive busbar (8). The conductive busbar (8) is fixedly connected to the rotating shaft (1). The conductive rod (7) passes through the shaft hole of the rotating shaft (1), with one end connected to the lead wire and the other end connected to the conductive busbar (8). The other end of the conductive busbar (8) is connected to the slip ring brush holder.

3. The high-reliability doubly-fed wind turbine generator according to claim 2, characterized in that: The conductive rod (7) is provided with threads for fixing one end of the lead wire to the conductive rod (7) by means of a nut, and the other end of the lead wire is fixed to the rotor (4) by means of the rotor pressure ring (10).

4. The high-reliability doubly-fed wind turbine generator according to claim 3, characterized in that: The conductive bus (8) is wrapped with an insulating layer and is fixed by inserting it into the shaft hole of the rotating shaft (1).

5. The high-reliability doubly-fed wind turbine generator according to claim 4, characterized in that: The end cap (12) has a balance block mounting port, and a detachable outer cover (13) is provided at the balance block mounting port.

6. The high-reliability doubly-fed wind turbine generator according to claim 5, characterized in that: It also includes a wind deflector (9), which is an integral structure and is fixed to the base (20) by a wind deflector connecting plate (14) and a pressure plate (15).

7. The high-reliability doubly-fed wind turbine generator according to claim 6, characterized in that: The rotor (4) is fixedly connected to the rotating shaft (1), and the stator (5) is fixedly connected to the base (20). The rotor (4) adopts a fanless design, and the end of the rotor (4) is provided with a segmented end clamp to improve the ventilation efficiency of the rotor end.

8. The high-reliability doubly-fed wind turbine generator according to claim 1, characterized in that: The cooling mechanism (6) includes a cooling cover (61) and a heat dissipation fan (62). The cooling cover (61) is provided with a first heat dissipation chamber (611), a second heat dissipation chamber (612) and a third heat dissipation chamber (613). The second heat dissipation chamber (612) is provided with a guide fan for controlling the airflow direction according to the internal temperature of the base (20).

9. The high-reliability doubly-fed wind turbine generator according to claim 8, characterized in that: The cooling cover (61) has an air inlet (63) on the side away from the heat dissipation fan (62), and a drive device for controlling the opening and closing of the air inlet (63) is provided at the air inlet (63).

10. The high-reliability doubly-fed wind turbine generator according to claim 8, characterized in that: The balance ring (11) is located at the original fan installation position.

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