Speed sensing device of doubly-fed wind generating set

Abstract

The utility model relates to the technical field of doubly-fed wind generating sets, and discloses a speed sensing device of a doubly-fed wind generating set. Comprising a machine body, a connecting shell is arranged on the side wall of the machine body, a first connecting strip is fixedly connected to the side wall of the machine body, and a second connecting strip is fixedly connected to the side wall of the connecting shell. The first arc-shaped strip and the second arc-shaped strip are fixedly installed on the shaft body of the unit, the shaft body rotates to drive the first arc-shaped strip and the second arc-shaped strip to rotate, the first arc-shaped strip rotates along the inner wall of the machine body and the inner wall of the connecting shell to drive the first magnetic block to rotate, and when the first magnetic block moves to the inner wall, located in the groove, of the machine body, the first magnetic block rotates. The magnetic poles on the corresponding sides of the first magnetic block and the second magnetic block are the same to generate repulsive force, the second magnetic block can be pushed to slide along the inner wall of the groove, the spring is compressed when the connecting rod and the pressing block are pushed to move, and the controller drives the alarm to give an alarm when the pressing block is pressed on the side wall of the pressure sensor.

Description

Technical Field

[0001] The utility model relates to the technical field of doubly-fed wind turbines, in particular to a speed sensing device for a doubly-fed wind turbine. Background Technique

[0002] Doubly-fed wind turbines are a technology widely used in wind power generation. Their main feature is the ability to operate efficiently at different wind speeds. To achieve this, the speed sensing device plays an important role in its control system.

[0003] In the prior art, during the use of a doubly-fed wind turbine, if it is a strong wind day, the rotation speed of the fan blades will increase, which will cause the rotation speed of the shaft of the generator set to increase. This will not only accelerate the internal wear of the unit, but also, if the rotation speed is too fast and not detected and processed in time, it may cause damage to the unit and affect subsequent use. Therefore, the utility model designs a speed sensing device for a doubly-fed wind turbine. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the problem in the prior art that during the use of a doubly-fed wind turbine, if it is a strong wind day, the rotation speed of the fan blades will increase, which will cause the rotation speed of the shaft of the generator set to increase. This will not only accelerate the internal wear of the unit, but also, if the rotation speed is too fast and not detected and processed in time, it may cause damage to the unit and affect subsequent use, and a speed sensing device for a doubly-fed wind turbine is proposed.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A speed sensing device for a doubly-fed wind turbine, including a machine body. A connecting shell is provided on the side wall of the machine body. A first connecting strip is fixedly connected to the side wall of the machine body. A second connecting strip is fixedly connected to the side wall of the connecting shell. A plurality of bolts are respectively threadedly connected to the inner walls of the first connecting strip and the second connecting strip. The machine body and the connecting shell are arranged in a fitting manner. A first arc-shaped strip and a second arc-shaped strip are simultaneously slidably arranged on the inner wall of the gap between the machine body and the connecting shell. A first magnetic block is fixedly connected to the inner wall of the first arc-shaped strip. A cavity is formed in the inner wall of the machine body. A controller is fixedly connected to the inner wall of the machine body. A pressure sensor is fixedly connected to the inner wall of the machine body in the cavity. An alarm is fixedly connected to the top inner wall of the machine body. The controller is electrically connected to the pressure sensor and the alarm respectively. A groove is formed in the inner wall of the machine body. An induction mechanism is arranged on the inner wall of the machine body in the groove.

[0007] Preferably, the sensing mechanism includes a second magnet, a spring, a connecting rod, and a pressing block. The spring is fixedly connected to the inner wall of the groove of the body. The second magnet is fixedly connected to the end of the spring. The connecting rod is fixedly connected to the connection between the second magnet and the spring. One end of the connecting rod away from the second magnet extends into the cavity and is fixedly connected to the pressing block. The pressing block is slidably arranged on the inner wall of the cavity.

[0008] Preferably, a rectangular groove is formed in the inner wall of the groove of the body, and a guiding block is slidably arranged on the inner wall of the rectangular groove of the body. The guiding block is fixedly connected to the side wall of the second magnet.

[0009] Preferably, the ends of the first arc-shaped strip and the second arc-shaped strip are in contact with each other. Insert blocks are respectively formed at both ends of the connecting shell and the second arc-shaped strip. Slots are respectively formed in the inner walls of the body and the first arc-shaped strip. The insert blocks are inserted into the inner walls of the slots, and a clamping mechanism is arranged in the inner wall of the insert blocks.

[0010] Preferably, the clamping mechanism includes a fixing rod, a clamping plate, and a torsion spring. A rectangular groove is formed in the inner wall of the insert block. The fixing rod is fixedly connected to the inner wall of the rectangular groove. The clamping plate and the torsion spring are respectively movably sleeved on the rod wall of the fixing rod. One end of the torsion spring is fixedly connected to the inner wall of the clamping plate, and the other end of the torsion spring is fixedly connected to the inner wall of the insert block. Card slots are respectively formed in the inner walls of the body and the first arc-shaped strip at the slots. The clamping plate extends into the inner wall of the card slot.

[0011] Preferably, the inner walls of the body and the first arc-shaped strip at the card slots are respectively set as fan-shaped slots. The end of the clamping plate is set as an arc surface and is tightly pressed on the inner wall of the card slot.

[0012] Preferably, a pulling rope is fixedly connected to the side wall of the clamping plate, and a handle is fixedly connected to one end of the pulling rope away from the clamping plate.

[0013] Preferably, stabilizing strips are respectively fixedly connected to the side walls of the first arc-shaped strip and the second arc-shaped strip. Ball bearings are respectively arranged in the inner walls of the plurality of stabilizing strips, and the ball bearings are arranged on the inner walls of the body and the connecting shell in a rolling manner.

[0014] Preferably, a notch is formed in the inner wall of the second arc-shaped strip, and an adjusting pressing plate is slidably arranged on the inner wall of the second arc-shaped strip. The side wall of the adjusting pressing plate is set as an arc surface and is fixedly connected with a wear-resistant pad. A threaded ring is fixedly connected to the inner wall of the second arc-shaped strip. A screw rod is threadedly connected to the inner wall of the threaded ring. The screw rod is rotatably connected to the inner wall of the adjusting pressing plate. One end of the screw rod away from the adjusting pressing plate penetrates through the threaded ring and is fixedly connected with a rotating handle.

[0015] Preferably, a stabilizing block is fixedly connected to the side wall of the adjusting pressing plate, a stabilizing groove is formed in the inner wall of the second arc-shaped strip, and the stabilizing block is slidably arranged on the inner wall of the stabilizing groove.

[0016] Compared with the prior art, the present utility model provides a speed sensing device for a doubly-fed wind turbine generator set, which has the following beneficial effects:

[0017] 1. The speed sensing device for the doubly-fed wind turbine generator set is fixedly installed on the shaft body of the unit through the first arc-shaped strip and the second arc-shaped strip. When the shaft body rotates, it drives the first arc-shaped strip and the second arc-shaped strip to rotate. The first arc-shaped strip rotates along the inner walls of the machine body and the connecting shell, driving the first magnetic block to rotate. When the first magnetic block moves to the inner wall of the groove of the machine body, the magnetic poles on the corresponding sides of the first magnetic block and the second magnetic block are the same, generating a repulsive force that can push the second magnetic block to slide along the inner wall of the groove, pushing the connecting rod and the pressing block to move, and compressing the spring. When the pressing block presses against the side wall of the pressure sensor, the controller drives the alarm to give an alarm, timely reminding the staff to find that the rotation speed of the unit shaft body is too fast and make adjustment.

[0018] 2. For the speed sensing device of the doubly-fed wind turbine generator set, after the insertion block is inserted into the inner wall of the slot, the torsion spring can push the clamping plate into the inner wall of the clamping slot, so that the first arc-shaped strip, the second arc-shaped strip, the machine body and the connecting shell are stably connected and installed, which is convenient for installation. Subsequently, pulling the handle to move the pull rope makes the clamping plate retract into the inner wall of the rectangular slot, facilitating subsequent disassembly.

[0019] 3. The speed sensing device for the doubly-fed wind turbine generator set can improve the rotation stability of the first arc-shaped strip and the second arc-shaped strip by the rotation of the stabilizing strip along the inner walls of the machine body and the connecting shell. The rolling balls reduce the friction when the stabilizing strip moves. Rotating the rotating handle drives the screw rod to rotate along the inner wall of the threaded ring, moving the adjusting pressing plate, so that the first arc-shaped strip and the second arc-shaped strip are installed on the shaft bodies with different diameters in the unit, improving the adaptability. The sliding of the stabilizing block along the inner wall of the stabilizing groove can improve the moving stability of the adjusting pressing plate. Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of a speed sensing device for a doubly-fed wind turbine generator set proposed by the present utility model;

[0021] Figure 2 is Figure 1 an enlarged schematic structural diagram of a partial A part in

[0022] Figure 3 is Figure 1 an enlarged schematic structural diagram of a partial B part in

[0023] Figure 4 is Figure 3 a three-dimensional structural diagram of the clamping plate in

[0024] Figure 5 For Figure 2 The three-dimensional structure diagram of the middle card board.

[0025] In the figure: 1 body, 2 connecting shell, 3 first connecting bar, 4 second connecting bar, 5 bolt, 6 first arc bar, 7 second arc bar, 8 first magnet, 9 second magnet, 10 spring, 11 controller, 12 pressure sensor, 13 connecting rod, 14 pressing block, 15 alarm, 16 guiding block, 17 inserting block, 18 fixing rod, 19 card board, 20 torsion spring, 21 pulling rope, 22 handle, 23 stabilizing bar, 24 ball, 25 adjusting pressing plate, 26 wear-resistant pad, 27 threaded ring, 28 screw rod, 29 turning handle, 30 stabilizing block. Specific implementation mode

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0027] Embodiment 1

[0028] Referring to Figures 1-5 , a speed sensing device for a doubly-fed wind turbine generator, including a body 1, a connecting shell 2 is provided on the side wall of the body 1, a first connecting bar 3 is fixedly connected to the side wall of the body 1, a second connecting bar 4 is fixedly connected to the side wall of the connecting shell 2, and a plurality of bolts 5 are respectively threadedly connected to the inner walls of the first connecting bar 3 and the second connecting bar 4. The body 1 and the connecting shell 2 are arranged in a fitting manner, and a first arc bar 6 and a second arc bar 7 are simultaneously slidably arranged on the inner wall of the gap between the body 1 and the connecting shell 2. A first magnet 8 is fixedly connected to the inner wall of the first arc bar 6. A cavity is opened on the inner wall of the body 1, a controller 11 is fixedly connected to the inner wall of the body 1, a pressure sensor 12 is fixedly connected to the inner wall of the body 1 in the cavity, an alarm 15 is fixedly connected to the top inner wall of the body 1, and the controller 11 is electrically connected to the pressure sensor 12 and the alarm 15 respectively. A groove is opened on the inner wall of the body 1.

[0029] An induction mechanism is provided on the inner wall of the body 1 in the groove. The induction mechanism includes a second magnet 9, a spring 10, a connecting rod 13 and a pressing block 14. The spring 10 is fixedly connected to the inner wall of the body 1 in the groove, the second magnet 9 is fixedly connected to the end of the spring 10, the connecting rod 13 is fixedly connected to the connection part of the second magnet 9 and the spring 10, and the end of the connecting rod 13 away from the second magnet 9 extends into the cavity and is fixedly connected to the pressing block 14. The pressing block 14 is slidably arranged on the inner wall of the cavity.

[0030] A rectangular groove is provided on the inner wall of the body 1 located in the groove, and a guide block 16 is slidably provided on the inner wall of the body 1 located in the rectangular groove. The guide block 16 is fixedly connected to the side wall of the second magnetic block 9, and the ends of the first arc strip 6 and the second arc strip 7 are fitted together. Insert blocks 17 are respectively provided at both ends of the connecting shell 2 and the second arc strip 7. Slots are respectively provided on the inner walls of the body 1 and the first arc strip 6, and the insert blocks 17 are plugged into the inner walls of the slots.

[0031] When in use, the body 1 and the connecting shell 2 can be fixedly installed by the first connecting strip 3, the second connecting strip 4 and the bolt 5, and the first arc strip 6 and the second arc strip 7 are fixedly installed on the shaft of the unit. The first arc strip 6 and the second arc strip 7 can be driven to rotate by the rotation of the shaft. The first arc strip 6 rotates along the inner wall of the body 1 and the connecting shell 2 to drive the first magnetic block 8 to rotate. When the first magnetic block 8 moves to the inner wall of the groove where the body 1 is located, the magnetic poles on the corresponding sides of the first magnetic block 8 and the second magnetic block 9 are the same to generate a repulsive force, which can push the second magnetic block 9 to slide along the inner wall of the groove. When the connecting rod 13 and the pressure block 14 move, the spring 10 is compressed. When the pressure block 14 is pressed tightly against the side wall of the pressure sensor 12, the controller 11 can drive the alarm 15 to alarm, so as to promptly remind the staff to find that the rotation speed of the unit shaft is too fast and make adjustments.

[0032] The sliding of the inner wall of the rectangular groove of the guide block 16 can improve the stability of the movement of the second magnetic block 9, and the insert block 17 can facilitate the installation of the first arc strip 6 and the second arc strip 7 and the body 1 and the connecting shell 2.

[0033] Embodiment 2

[0034] Reference Figures 1-5 The inner wall of the plug block 17 is provided with a clamping mechanism, which includes a fixing rod 18, a clamping plate 19 and a torsion spring 20. A rectangular groove is opened on the inner wall of the plug block 17, and the fixing rod 18 is fixedly connected to the inner wall of the rectangular groove. The clamping plate 19 and the torsion spring 20 are respectively movably sleeved on the rod wall of the fixing rod 18, one end of the torsion spring 20 is fixedly connected to the inner wall of the clamping plate 19, and the other end of the torsion spring 20 is fixedly connected to the inner wall of the plug block 17. The inner walls of the body 1 and the first arc-shaped bar 6 located in the slot are respectively provided with clamping grooves, and the clamping plate 19 extends to the inner wall of the clamping groove. The inner walls of the body 1 and the first arc-shaped bar 6 located in the clamping groove are respectively arranged as fan-shaped grooves, and the end of the clamping plate 19 is arranged as an arc surface and is pressed against the inner wall of the clamping groove. A pull rope 21 is fixedly connected to the side wall of the clamping plate 19, and a handle 22 is fixedly connected to the end of the pull rope 21 away from the clamping plate 19.

[0035] After the plug-in block 17 is inserted into the inner wall of the slot, the torsion spring 20 can push the card plate 19 to be located on the inner wall of the slot, so that the first arc strip 6 and the second arc strip 7 and the body 1 and the connecting shell 2 can be stably connected and installed, which is convenient for installation. The subsequent pulling of the handle 22 can pull the pull rope 21 to move, so that the card plate 19 can be retracted to the inner wall of the rectangular slot, which is convenient for subsequent disassembly.

[0036] Embodiment 3

[0037] Reference Figures 1-5 The first arc strip 6 and the second arc strip 7 are respectively fixedly connected to the side walls with stabilizing strips 23, and the inner walls of the plurality of stabilizing strips 23 are respectively provided with rolling balls 24, and the balls 24 are rollingly arranged on the inner walls of the body 1 and the connecting shell 2. A notch is provided on the inner wall of the second arc strip 7, and an adjusting pressure plate 25 is slidably arranged on the inner wall of the second arc strip 7. The side wall of the adjusting pressure plate 25 is provided with an arc surface and is fixedly connected with a wear-resistant pad 26. A threaded ring 27 is fixedly connected to the inner wall of the second arc strip 7, and a screw 28 is threadedly connected to the inner wall of the threaded ring 27. The screw 28 is rotatably connected to the inner wall of the adjusting pressure plate 25, and one end of the screw 28 away from the adjusting pressure plate 25 passes through the threaded ring 27 and is fixedly connected with a rotating handle 29. A stabilizing block 30 is fixedly connected to the side wall of the adjusting pressure plate 25, and a stabilizing groove is provided on the inner wall of the second arc strip 7, and the stabilizing block 30 is slidably arranged on the inner wall of the stabilizing groove.

[0038] The rotation of the stabilizing bar 23 along the inner wall of the body 1 and the connecting shell 2 can improve the rotation stability of the first arc-shaped bar 6 and the second arc-shaped bar 7, and the ball 24 can reduce the friction when the stabilizing bar 23 moves. Rotating the handle 29 can drive the screw 28 to rotate along the inner wall of the threaded ring 27, so that the adjusting pressure plate 25 can be moved, and the first arc-shaped bar 6 and the second arc-shaped bar 7 can be installed on shafts of different diameters in the unit, which can improve adaptability, and the sliding of the stabilizing block 30 along the inner wall of the stabilizing groove can improve the stability of the movement of the adjusting pressure plate 25.

[0039] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A speed sensing device for a doubly-fed wind turbine generator, comprising a machine body (1), characterized in that: A connecting shell (2) is provided on the side wall of the machine body (1), a first connecting strip (3) is fixedly connected to the side wall of the machine body (1), a second connecting strip (4) is fixedly connected to the side wall of the connecting shell (2), the inner walls of the first connecting strip (3) and the second connecting strip (4) are respectively threadedly connected with a plurality of bolts (5), the machine body (1) and the connecting shell (2) are arranged in close contact, and a first arc strip (6) and a second arc strip (7) are simultaneously slidably provided on the inner wall of the gap between the machine body (1) and the connecting shell (2), the first arc strip (6) ) is fixedly connected to the inner wall of the body (1) with a first magnetic block (8), the inner wall of the body (1) is provided with a cavity, the inner wall of the body (1) is fixedly connected to the controller (11), the inner wall of the body (1) located in the cavity is fixedly connected to a pressure sensor (12), the top inner wall of the body (1) is fixedly connected to an alarm (15), the controller (11) is electrically connected to the pressure sensor (12) and the alarm (15) respectively, the inner wall of the body (1) is provided with a groove, and the inner wall of the body (1) located in the groove is provided with a sensing mechanism.

2. The speed sensing device of a doubly-fed wind turbine generator according to claim 1, characterized in that: The sensing mechanism comprises a second magnetic block (9), a spring (10), a connecting rod (13) and a pressure block (14); the spring (10) is fixedly connected to the inner wall of the body (1) located in the groove; the second magnetic block (9) is fixedly connected to the end of the spring (10); the connecting rod (13) is fixedly connected to the connection between the second magnetic block (9) and the spring (10); one end of the connecting rod (13) facing away from the second magnetic block (9) extends to the interior of the cavity and is fixedly connected to the pressure block (14); and the pressure block (14) is slidably arranged on the inner wall of the cavity.

3. The speed sensing device of a doubly-fed wind turbine generator according to claim 1, characterized in that: The inner wall of the body (1) located in the groove is provided with a rectangular groove, and the inner wall of the body (1) located in the rectangular groove is provided with a guide block (16) for sliding, and the guide block (16) is fixedly connected to the side wall of the second magnetic block (9).

4. A speed sensing device for a doubly-fed wind turbine generator according to claim 1, characterized in that: The ends of the first arc-shaped strip (6) and the second arc-shaped strip (7) are arranged in a close fit, and plug-in blocks (17) are respectively provided at both ends of the connecting shell (2) and the second arc-shaped strip (7), and slots are respectively provided on the inner walls of the machine body (1) and the first arc-shaped strip (6), and the plug-in blocks (17) are plugged into the inner walls of the slots, and a clamping mechanism is provided on the inner walls of the plug-in blocks (17).

5. The speed sensing device of a doubly-fed wind turbine generator according to claim 4, characterized in that: The clamping mechanism comprises a fixing rod (18), a clamping plate (19) and a torsion spring (20); a rectangular groove is provided on the inner wall of the insert block (17); the fixing rod (18) is fixedly connected to the inner wall of the rectangular groove; the clamping plate (19) and the torsion spring (20) are respectively movably sleeved on the rod wall of the fixing rod (18); one end of the torsion spring (20) is fixedly connected to the inner wall of the clamping plate (19); the other end of the torsion spring (20) is fixedly connected to the inner wall of the insert block (17); the inner walls of the body (1) and the first arc-shaped strip (6) located in the slot are respectively provided with clamping grooves; the clamping plate (19) extends to the inner wall of the clamping groove.

6. The speed sensing device of a doubly-fed wind turbine generator according to claim 5, characterized in that: The inner walls of the machine body (1) and the first arc strip (6) located at the slot are respectively arranged as fan-shaped grooves, and the end of the clamping plate (19) is arranged as an arc surface and is pressed against the inner wall of the slot.

7. A speed sensing device for a doubly-fed wind turbine generator according to claim 5, characterized in that: A pull rope (21) is fixedly connected to the side wall of the clamping plate (19), and a handle (22) is fixedly connected to the end of the pull rope (21) away from the clamping plate (19).

8. A speed sensing device for a doubly-fed wind turbine generator according to claim 1, characterized in that: Stabilizing bars (23) are respectively fixedly connected to the side walls of the first arc-shaped bar (6) and the second arc-shaped bar (7). Ball bearings (24) are respectively arranged to roll on the inner walls of the plurality of stabilizing bars (23), and the ball bearings (24) are arranged to roll on the inner walls of the machine body (1) and the connecting shell (2).

9. A speed sensing device for a doubly-fed wind turbine generator according to claim 1, characterized in that: A notch is formed in the inner wall of the second arc-shaped bar (7). An adjusting pressing plate (25) is slidably arranged on the inner wall of the second arc-shaped bar (7). The side wall of the adjusting pressing plate (25) is an arc surface and is fixedly connected with a wear-resistant pad (26). A threaded ring (27) is fixedly connected to the inner wall of the second arc-shaped bar (7). A screw rod (28) is threadedly connected to the inner wall of the threaded ring (27). The screw rod (28) is rotatably connected to the inner wall of the adjusting pressing plate (25). The end of the screw rod (28) away from the adjusting pressing plate (25) penetrates through the threaded ring (27) and is fixedly connected with a turning handle (29).

10. A speed sensing device for a doubly-fed wind turbine according to claim 9, characterized in that: A stabilizing block (30) is fixedly connected to the side wall of the adjusting pressing plate (25). A stabilizing groove is formed in the inner wall of the second arc-shaped bar (7). The stabilizing block (30) is slidably arranged on the inner wall of the stabilizing groove.

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