Emergency speed reducer for overspeed of wind driven generator

Abstract

The utility model discloses a wind driven generator overspeed emergency reduction gear which comprises a generator body, an input shaft is arranged on one side of the generator body, a rotating speed monitoring box is sleeved on the outer wall of the input shaft, the rotating speed monitoring box is fixedly connected with the generator body, fan blades are arranged on one side of the input shaft, and a rotating speed sensor is arranged at the top end in the rotating speed monitoring box. And an induction gear fixedly sleeves the outer wall of the input shaft in the rotating speed monitoring box. The wind driven generator has the beneficial effects that by arranging the rotating speed monitoring box and the input shaft speed limiting mechanism, when the rotating speed of the input shaft exceeds a specified value, emergency speed reduction treatment can be conducted on the input shaft, damage to internal devices of the wind driven generator due to too high rotating speed of the input shaft is prevented, and safety is improved; and meanwhile, an expansion assembly in the input shaft speed limiting mechanism can simultaneously drive multiple groups of arc-shaped belt pulleys to synchronously move through one servo motor, so that the moving distances are the same, the precision is high, and normal rotation of the arc-shaped belt pulleys is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power generation equipment, in particular to an overspeed emergency deceleration device for a wind power generator. Background Art

[0002] Wind turbines are important tools for generating electricity. They mainly convert wind energy into mechanical energy and further into electrical energy. By utilizing natural resources, they can save a large amount of electricity for humans every year and are deeply loved by people.

[0003] According to a wind turbine reduction device disclosed in Chinese patent CN202120109108.X, the application solves the problem of regular replacement and increased maintenance costs by setting up an electric cylinder, arc plate, rotating wheel, belt, second fixed block, slide groove, second straight rod, slider, spring, second bearing and guide wheel. It is more practical and suitable for wide promotion and use. The existing wind turbine reduction device needs to use multiple sets of electric cylinders to regulate multiple sets of arc plates at the same time, and it cannot ensure that the moving distances of multiple sets of arc plates are the same, and the accuracy is poor.

[0004] Currently, no effective solution has been proposed for the problems in the related technologies. Summary of the invention

[0005] In view of the problems in the related technology, the utility model proposes an overspeed emergency deceleration device for a wind turbine generator to overcome the above technical problems existing in the existing related technology.

[0006] To this end, the specific technical solutions adopted by the utility model are as follows:

[0007] A wind turbine overspeed emergency deceleration device comprises a generator body, an input shaft is arranged on one side of the generator body, a speed monitoring box is sleeved on the outer wall of the input shaft, the speed monitoring box is fixedly connected to the generator body, a fan blade is arranged on one side of the input shaft, a speed sensor is arranged on the top of the speed monitoring box, an induction gear is arranged in the speed monitoring box and located on the fixed sleeve of the outer wall of the input shaft, a PLC controller is arranged on the bottom end of the speed monitoring box, and an input shaft speed limiting mechanism is arranged on the top of the generator body.

[0008] Preferably, through holes matching the input shaft are formed on both sides of the speed monitoring box.

[0009] Preferably, a plurality of evenly distributed heat dissipation holes are provided at the bottom of the speed monitoring box, and a dustproof net is provided in the heat dissipation holes.

[0010] Preferably, the input shaft speed limiting mechanism includes a mounting plate provided on one side of the top end of the generator body, a rotating shaft is provided on one side of the mounting plate, an adjusting box is fixedly provided on one side of the rotating shaft, four groups of arc-shaped pulleys distributed in a circular array are provided on the outer wall of the adjusting box, the arc-shaped pulleys are connected to the adjusting box through an expansion component, a main pulley is provided on the fixed sleeve on the outer wall of the input shaft, and the arc-shaped pulley is connected to the main pulley through a transmission belt.

[0011] Preferably, the expansion assembly includes a transversely arranged screw rod in the adjustment box, the outer wall of the screw rod is sleeved with symmetrically arranged moving blocks, and two groups of the moving blocks are respectively connected to the four groups of arc-shaped pulleys through rocker rods.

[0012] Preferably, the screw rod is connected to the regulating box via a bearing, and one side of the screw rod extends outside the regulating box and is connected to a driving end of a servo motor.

[0013] Preferably, the regulating box is provided with limit rods which are symmetrically arranged and pass through the two groups of moving blocks, the two groups of moving blocks are provided with sliding holes matching the limit rods, the two groups of moving blocks are provided with threaded holes matching the screw rods, and the thread directions of the two groups of threaded holes are opposite.

[0014] Preferably, the rocker arm is hingedly connected to the arc pulley and the main pulley respectively.

[0015] The beneficial effects of the utility model are as follows: by setting a speed monitoring box and an input shaft speed limiting mechanism, when the input shaft speed exceeds a specified value, the input shaft can be urgently decelerated to prevent the input shaft speed from being too fast and causing damage to the internal components of the wind turbine, thereby improving safety. At the same time, the expansion component in the input shaft speed limiting mechanism can drive multiple groups of arc-shaped pulleys to move synchronously at the same time through a servo motor, so that their moving distances are the same and the accuracy is high, ensuring that the arc-shaped pulleys can rotate normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the overall structure of an overspeed emergency deceleration device for a wind turbine generator according to an embodiment of the utility model;

[0018] Figure 2This is a front view of an overspeed emergency deceleration device for a wind turbine generator according to an embodiment of the utility model; Figure 3 It is a main cross-sectional view of a speed monitoring box in an overspeed emergency deceleration device of a wind turbine generator according to an embodiment of the utility model;

[0019] Figure 4 It is a schematic diagram of the structure of an adjustment box in an overspeed emergency deceleration device of a wind turbine generator according to an embodiment of the utility model;

[0020] Figure 5 It is a main cross-sectional view of an adjustment box in an overspeed emergency deceleration device of a wind turbine generator according to an embodiment of the utility model;

[0021] Figure 6 It is a side sectional view of an adjustment box in an overspeed emergency deceleration device of a wind turbine generator according to an embodiment of the utility model.

[0022] In the figure:

[0023] 1. Generator body; 2. Input shaft; 3. Speed ​​monitoring box; 4. Fan blades; 5. Speed ​​sensor; 6. Induction gear; 7. PLC controller; 8. Heat dissipation hole; 9. Mounting plate; 10. Rotating shaft; 11. Adjustment box; 12. Arc pulley; 13. Main pulley; 14. Transmission belt; 15. Screw; 16. Moving block; 17. Rocker arm; 18. Servo motor; 19. Limit rod; 20. Threaded hole. DETAILED DESCRIPTION

[0024] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention and are mainly used to illustrate the embodiments. They can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, ordinary technicians in the field should be able to understand other possible implementation methods and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0025] According to an embodiment of the utility model, a wind turbine overspeed emergency deceleration device is provided. Example

[0026] like Figure 1-6 As shown, according to the embodiment of the utility model, the wind turbine overspeed emergency deceleration device includes a generator body 1, an input shaft 2 is provided on one side of the generator body 1, a speed monitoring box 3 is provided on the outer wall of the input shaft 2, the speed monitoring box 3 is fixedly connected to the generator body 1, a fan blade 4 is provided on one side of the input shaft 2, a speed sensor 5 is provided on the top of the speed monitoring box 3, an induction gear 6 is provided in the speed monitoring box 3 and is fixedly sleeved on the outer wall of the input shaft 2, a PLC controller 7 is provided on the bottom end of the speed monitoring box 3, and an input shaft speed limiting mechanism is provided on the top of the generator body 1. Example

[0027] like Figure 1-6 As shown, it includes a generator body 1, an input shaft 2 is provided on one side of the generator body 1, a speed monitoring box 3 is provided on the outer wall of the input shaft 2, the speed monitoring box 3 is fixedly connected to the generator body 1, a fan blade 4 is provided on one side of the input shaft 2, a speed sensor 5 is provided at the top of the speed monitoring box 3, an induction gear 6 is provided in the speed monitoring box 3 and is fixedly provided on the outer wall of the input shaft 2, a PLC controller 7 is provided at the bottom of the speed monitoring box 3, and an input shaft speed limiting mechanism is provided at the top of the generator body 1. Through holes matching the input shaft 2 are provided on both sides of the speed monitoring box 3. Several evenly distributed heat dissipation holes 8 are provided at the bottom of the speed monitoring box 3, and a dustproof net is provided in the heat dissipation holes 8. By setting the speed sensor 5, the speed of the input shaft 2 can be monitored in real time, and by opening the heat dissipation holes 8 on the speed monitoring box 3, the speed sensor 5 and the PLC controller 7 can be cooled to a certain extent to prevent the internal temperature of the speed monitoring box from being too high and causing device failure. Example

[0028] like Figure 1-6As shown, it includes a generator body 1, an input shaft 2 is provided on one side of the generator body 1, a speed monitoring box 3 is provided on the outer wall of the input shaft 2, the speed monitoring box 3 is fixedly connected to the generator body 1, a fan blade 4 is provided on one side of the input shaft 2, a speed sensor 5 is provided on the top of the speed monitoring box 3, an induction gear 6 is provided in the speed monitoring box 3 and is located on the outer wall of the input shaft 2, a PLC controller 7 is provided on the bottom of the speed monitoring box 3, and an input shaft speed limiting mechanism is provided on the top of the generator body 1. The input shaft speed limiting mechanism includes a mounting plate 9 provided on one side of the top of the generator body 1, a rotating shaft 10 is provided on one side of the mounting plate 9, an adjusting box 11 is fixedly provided on one side of the rotating shaft 10, four groups of arc-shaped pulleys 12 distributed in a circumferential array are provided on the outer wall of the adjusting box 11, and the arc-shaped pulley 12 is connected to the adjusting box 11 through an expansion component, and a main pulley 13 is provided on the outer wall of the input shaft 2, and the arc-shaped pulley 12 is connected to the main pulley 13 through a transmission belt 14. The expansion assembly includes a transversely arranged screw rod 15 in the adjustment box 11, and the outer wall of the screw rod 15 is sleeved with symmetrically arranged moving blocks 16, and the two groups of moving blocks 16 are respectively connected to the four groups of arc-shaped pulleys 12 through the swing rod 17. The screw rod 15 is connected to the adjustment box 11 through a bearing, and one side of the screw rod 15 extends outside the adjustment box 11 and is connected to the driving end of the servo motor 18. The adjustment box 11 is provided with a symmetrically arranged limit rod 19 that passes through the two groups of moving blocks 16, and the two groups of moving blocks 16 are provided with sliding holes that match the limit rod 19, and the two groups of moving blocks 16 are provided with threaded holes 20 that match the screw rod 15, and the thread directions of the two groups of threaded holes 20 are opposite. The swing rod 17 is respectively hingedly connected to the arc-shaped pulley 12 and the main pulley 13. When the external wind force drives the input shaft 2 to rotate through the fan blades 4, the input shaft 2 drives the induction gear 6 to rotate, and the speed sensor 5 monitors the speed. When the speed of the input shaft 2 exceeds the specified value, the speed sensor 5 transmits a signal to the PLC controller 7, and the PLC controller 7 starts the servo motor 18. The servo motor 18 drives the screw rod 15 to rotate, and the screw rod 15 drives the two groups of moving blocks 16 to move similarly. The two groups of moving blocks 16 drive the four groups of arc-shaped pulleys 12 to move synchronously through the rocker 17, thereby increasing the diameter of the circle formed by the four groups of arc-shaped pulleys 12, thereby reducing the transmission efficiency of the transmission belt 14, so that the speed of the input shaft 2 is reduced. By setting a speed monitoring box and an input shaft speed limiting mechanism, when the input shaft speed exceeds the specified value, the input shaft can be urgently decelerated to prevent the input shaft speed from being too fast and causing damage to the internal components of the wind turbine, thereby improving safety. At the same time, the expansion component in the input shaft speed limiting mechanism can drive multiple groups of arc-shaped pulleys to move synchronously through a servo motor at the same time, so that the moving distance is the same and the accuracy is high, ensuring that the arc-shaped pulleys can rotate normally.

[0029] In actual application, by setting up the speed sensor 5, the speed of the input shaft 2 can be monitored in real time. By opening the heat dissipation holes 8 on the speed monitoring box 3, the speed sensor 5 and the PLC controller 7 can be cooled to a certain extent to prevent the internal temperature of the speed monitoring box from being too high and causing device failure. When the external wind drives the input shaft 2 to rotate through the fan blades 4, the input shaft 2 drives the induction gear 6 to rotate, and the speed sensor 5 monitors the speed. When the speed of the input shaft 2 exceeds the specified value, the speed sensor 5 transmits a signal to the PLC controller 7, and the PLC controller 7 starts the servo motor 18. The servo motor 18 drives the screw rod 15 to rotate, and the screw rod 15 drives the two sets of moving blocks 16 to rotate. The two groups of moving blocks 16 drive the four groups of arc-shaped pulleys 12 to move synchronously through the rocker 17, thereby increasing the diameter of the circle formed by the four groups of arc-shaped pulleys 12, thereby reducing the transmission efficiency of the transmission belt 14, so that the speed of the input shaft 2 is reduced. By setting a speed monitoring box and an input shaft speed limiting mechanism, when the input shaft speed exceeds the specified value, the input shaft can be urgently decelerated to prevent the internal components of the wind turbine from being damaged due to excessive input shaft speed, thereby improving safety. At the same time, the expansion components in the input shaft speed limiting mechanism can drive multiple groups of arc-shaped pulleys to move synchronously through a servo motor at the same time, so that their moving distances are the same and the accuracy is high, ensuring that the arc-shaped pulleys can rotate normally.

[0030] In summary, with the help of the above technical solution of the utility model, by setting the speed monitoring box and the input shaft speed limiting mechanism, when the input shaft speed exceeds the specified value, the input shaft can be urgently decelerated to prevent the input shaft speed from being too fast and causing damage to the internal components of the wind turbine, thereby improving safety. At the same time, the expansion component in the input shaft speed limiting mechanism can be driven by a servo motor to simultaneously drive multiple groups of arc-shaped pulleys to move synchronously, so that the moving distance is the same and the accuracy is high, ensuring that the arc-shaped pulleys can rotate normally. The above description is only a preferred embodiment of the utility model, and is not intended to limit the utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A wind turbine overspeed emergency deceleration device, characterized in that: The invention comprises a generator body (1), wherein an input shaft (2) is provided on one side of the generator body (1), a speed monitoring box (3) is sleeved on the outer wall of the input shaft (2), the speed monitoring box (3) is fixedly connected to the generator body (1), a fan blade (4) is provided on one side of the input shaft (2), a speed sensor (5) is provided at the top end of the speed monitoring box (3), an induction gear (6) is provided in the speed monitoring box (3) and is fixedly sleeved on the outer wall of the input shaft (2), a PLC controller (7) is provided at the bottom end of the speed monitoring box (3), and an input shaft speed limiting mechanism is provided at the top end of the generator body (1).

2. The wind turbine overspeed emergency deceleration device according to claim 1, characterized in that: Through holes matching the input shaft (2) are provided on both sides of the rotation speed monitoring box (3).

3. The wind turbine overspeed emergency deceleration device according to claim 1, characterized in that: The bottom end of the rotation speed monitoring box (3) is provided with a plurality of evenly distributed heat dissipation holes (8), and a dustproof net is provided in the heat dissipation holes (8).

4. The wind turbine overspeed emergency deceleration device according to claim 1, characterized in that: The input shaft speed limiting mechanism comprises a mounting plate (9) provided on one side of the top end of the generator body (1), a rotating shaft (10) provided on one side of the mounting plate (9), an adjusting box (11) fixedly provided on one side of the rotating shaft (10), an outer wall of the adjusting box (11) provided with four groups of arc-shaped pulleys (12) distributed in a circumferential array, the arc-shaped pulleys (12) being connected to the adjusting box (11) via an expansion component, a main pulley (13) being fixedly provided on the outer wall of the input shaft (2), the arc-shaped pulley (12) being connected to the main pulley (13) via a transmission belt (14).

5. The wind turbine overspeed emergency deceleration device according to claim 4, characterized in that: The expansion assembly comprises a transversely arranged screw rod (15) in the regulating box (11), the outer wall of the screw rod (15) is sleeved with symmetrically arranged moving blocks (16), and two groups of the moving blocks (16) are respectively connected to the four groups of arc-shaped pulleys (12) through rocker rods (17).

6. The wind turbine overspeed emergency deceleration device according to claim 5, characterized in that: The screw rod (15) is connected to the regulating box (11) via a bearing, and one side of the screw rod (15) extends outside the regulating box (11) to be connected to a driving end of a servo motor (18).

7. The wind turbine overspeed emergency deceleration device according to claim 5, characterized in that: The regulating box (11) is provided with symmetrically arranged limit rods (19) that penetrate the two groups of moving blocks (16); the two groups of moving blocks (16) are provided with sliding holes that match the limit rods (19); the two groups of moving blocks (16) are provided with threaded holes (20) that match the screw rods (15); and the thread directions of the two groups of threaded holes (20) are opposite.

8. The wind turbine overspeed emergency deceleration device according to claim 5, characterized in that: The swing rod (17) is respectively hingedly connected to the arc-shaped belt pulley (12) and the main belt pulley (13).

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