A permanent magnet direct drive wind turbine blade pitch control device

Abstract

The present invention provides a permanent magnet direct-drive wind turbine blade pitch control device, comprising a shell and a transmission shaft with one end fixed in the shell, the outer surface of one end of the transmission shaft in the shell is provided with three connecting columns rotatably installed in a ring shape and at equal intervals, the outer surface of one end of the connecting column in the shell is sleeved with a first bevel gear fixedly connected to the connecting column, the first bevel gear is meshed with a second bevel gear, a connecting shaft is fixedly connected to the middle position of a side of the second bevel gear away from the transmission shaft, a threaded hole is provided in the middle position of a side of the connecting shaft away from the second bevel gear, a threaded head is threadedly connected in the threaded hole, and an end of the threaded head away from the connecting shaft is fixedly connected to the output end of the permanent magnet motor. Compared with the prior art, the present invention has the following beneficial effects: providing time for no-load starting of the permanent magnet motor, and avoiding damage to the permanent magnet motor due to excessive starting load.

Description

Technical Field

[0001] The invention discloses a permanent magnet direct-drive fan blade variable pitch device, belonging to the technical field of wind power generation. Background Art

[0002] The variable pitch system is one of the core parts of the wind turbine control system. Its main task is to complete the power stabilization control and load reduction control. At present, the transmission mode of motor and gear is the commonly used driving mode of the variable pitch system. The motor is generally directly connected to the blade through the gear transmission mode. However, for the heavy blades, the motor is prone to overload at the moment of starting. The probability of the motor failing due to overload is relatively high, which affects the service life of the motor. Summary of the invention

[0003] In view of the deficiencies in the prior art, an object of the present invention is to provide a permanent magnet direct-drive wind turbine blade pitch control device to solve the problems raised in the above background technology.

[0004] In order to achieve the above-mentioned purpose, the present invention is realized through the following technical scheme: a permanent magnet direct-drive wind turbine blade pitch device, comprising a housing and a transmission shaft with one end fixed in the housing, the outer surface of one end of the transmission shaft in the housing is annularly and equidistantly rotatably installed with three connecting columns, the connecting column extends to the outside of the housing away from the end of the transmission shaft and is installed with a blade, the outer surface of one end of the connecting column in the housing is sleeved with a first bevel gear fixedly connected to the connecting column, the first bevel gear is meshed with the second bevel gear, the middle position of the side of the second bevel gear away from the transmission shaft is fixedly connected with a connecting shaft, the connecting shaft is rotatably installed in the housing through a connecting member, a threaded hole is provided in the middle position of the side of the connecting shaft away from the second bevel gear, a threaded head is threadedly connected in the threaded hole, the end of the threaded head away from the connecting shaft is fixedly connected to the output end of the permanent magnet motor, the permanent magnet motor is slidably connected to the housing through a support member, and a reset member for forcing the permanent magnet motor to move in the direction of the second bevel gear is provided on the side of the permanent magnet motor away from the threaded head.

[0005] Furthermore, the connecting member includes a bearing, which is sleeved on the connecting shaft on one side close to the second bevel gear and fixedly connected to the connecting shaft. Three connecting rods are fixedly arranged in an annular shape on the outer surface of the bearing outer ring at equal intervals. The end of the connecting rod away from the bearing is fixedly connected to the housing.

[0006] Furthermore, the support member includes a support plate, one end of which is fixed inside the shell, an end of the support plate close to the second bevel gear is fixedly connected to a connecting plate, an end of the connecting plate away from the support plate is fixedly connected to the shell, a T-slot arranged along the length direction of the thread head is provided on a side of the support plate facing the permanent magnet motor, a T-slide block is fixedly connected to the outer surface of the permanent magnet motor, and the T-slide block is slidably installed in the T-slot.

[0007] Furthermore, a plurality of ash leakage openings are provided on the inner surface of the T-shaped slot, and the plurality of ash leakage openings are arranged equidistantly along the length direction of the T-shaped slot.

[0008] Furthermore, a rectangular opening is opened on one side of the connecting plate, the connecting plate and the supporting plate are an integrally formed structure, and the connecting plate and the supporting plate are arranged at an angle of 90°.

[0009] Furthermore, the reset member includes a cylinder, which is arranged along the length direction of the threaded head, and the end of the cylinder away from the motor is open and fixedly connected to a support plate, and the support plate is fixed in the shell. A spring is provided in the cylinder, and a pressure plate is provided on the side of the spring away from the support plate. The pressure plate is slidably installed in the cylinder, and the end of the pressure plate away from the spring is fixedly connected to a push rod, and the end of the push rod away from the pressure plate extends to the outside of the cylinder and contacts with the permanent magnet motor.

[0010] Furthermore, an outer surface of the open end of the cylinder is processed with an external thread, and one end of the cylinder processed with the external thread is threadedly connected with a threaded sleeve, and the threaded sleeve is fixedly connected to the support plate.

[0011] Furthermore, a disc is fixedly connected to one end of the push rod away from the pressure plate, the disc and the push rod are an integrally formed structure, and a rubber pad is glued to one side of the disc away from the push rod.

[0012] Furthermore, a bobbin for hiding the threaded head is sleeved on the threaded head, the bobbin is sleeved on the connecting shaft and is in sliding contact with the connecting shaft, the end of the bobbin close to the permanent magnet motor is fixedly connected to the threaded head, the end of the bobbin close to the connecting shaft is fixedly connected to a conical sleeve, the small head end of the conical sleeve is in contact with the surface of the connecting shaft, and the conical sleeve and the bobbin are an integrally formed structure.

[0013] Furthermore, the outer surface of one end of the transmission shaft in the housing is sleeved with a sleeve fixedly connected to the connecting shaft, and one end of the sleeve is fixedly connected to the housing.

[0014] Beneficial effects of the present invention:

[0015] 1. A permanent magnet direct-drive wind turbine blade pitch control device of the present invention, when it is necessary to use a permanent magnet motor to drive the blade to rotate to achieve pitch control, first control the permanent magnet motor to reverse, and then the permanent magnet motor drives the threaded head to rotate in the threaded hole and move the threaded head out of the threaded hole, and then the permanent magnet motor moves in the direction away from the connecting shaft until the threaded head is separated from the threaded hole. During the movement, the permanent magnet motor drives the T-shaped slider to slide in the T-shaped slot, which plays a role in limiting the movement trajectory of the permanent magnet motor, and then controls the permanent magnet motor to rotate forward, and the permanent magnet motor drives the threaded head to re-enter the threaded hole. At this time, the threaded head is not fully connected to the connecting shaft, so the blade does not rotate, thereby providing time for the permanent magnet motor to start at no load during the process of the threaded head fully entering the threaded hole, thereby avoiding damage to the permanent magnet motor due to excessive starting load.

[0016] 2. In a permanent magnet direct-drive fan blade variable pitch device of the present invention, during the reversal of the permanent magnet motor, the permanent magnet motor squeezes the push rod, and the push rod drives the pressure plate to move in the cylinder and squeeze the spring. The spring is elastically deformed by the squeezing. When the permanent magnet motor rotates forward, under the action of the spring rebound force, it is convenient to make one end of the threaded head fit into the threaded hole, which is conducive to re-connecting the threaded head with the connecting shaft thread.

[0017] 3. A permanent magnet direct-drive fan blade variable pitch device of the present invention fixes a bobbin on a threaded head, and the bobbin sleeve is arranged on a connecting shaft, so that the threaded head is hidden in a closed space formed by the bobbin and the connecting shaft, which prevents dust from randomly adhering to the threaded head. A conical sleeve is fixed on the bobbin, and when the bobbin moves along the surface of the connecting shaft, the conical sleeve shovels off the dust adhering to the surface of the connecting shaft, preventing the dust adhering to the surface of the connecting shaft from entering the bobbin. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0019] Figure 1 It is a structural schematic diagram of a permanent magnet direct-drive wind turbine blade pitch control device of the present invention;

[0020] Figure 2 This is an enlarged view of point A in a permanent magnet direct-drive wind turbine blade pitch control device of the present invention;

[0021] Figure 3 It is a schematic diagram of the assembly of a connecting plate and a supporting plate in a permanent magnet direct-drive wind turbine blade pitch control device of the present invention;

[0022] Figure 4 It is a schematic diagram of the assembly of a spring, a push rod and a cylinder in a permanent magnet direct-drive wind turbine blade pitch control device of the present invention;

[0023] Figure 5A three-dimensional diagram of a T-shaped slider in a permanent magnet direct-drive wind turbine blade pitch control device of the present invention;

[0024] In the figure: 1-housing, 2-connecting rod, 3-blade, 4-connecting column, 5-first bevel gear, 6-tube sleeve, 7-transmission shaft, 8-second bevel gear, 9-connecting plate, 10-support plate, 11-T-type slider, 12-permanent magnet motor, 13-support plate, 14-threaded sleeve, 15-cylinder, 16-top rod, 17-bearing, 18-connecting shaft, 19-tapered sleeve, 20-bobbin, 21-threaded head, 22-threaded hole, 23-T-slot, 24-ash leakage port, 25-rectangular port, 26-spring, 27-pressure plate, 28-disc. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0026] See also Figures 1 to 5 The present invention provides a technical solution: a permanent magnet direct-drive wind turbine blade pitch control device, comprising a shell 1 and a transmission shaft 7 with one end fixed in the shell 1, an outer surface of one end of the transmission shaft 7 in the shell 1 is sleeved with a sleeve 6 fixedly connected to a connecting shaft 18, one end of the sleeve 6 is fixedly connected to the shell 1, and the sleeve 6 is installed between the transmission shaft 7 and the shell 1 to increase the connection range of the transmission shaft 7 and the shell 1 and improve the stability of the connection between the transmission shaft 7 and the shell 1.

[0027] The outer surface of one end of the transmission shaft 7 in the housing 1 is equidistantly and rotatably installed with three connecting columns 4 in a circular shape. The connecting column 4 extends to the outside of the housing 1 at one end away from the transmission shaft 7 and is installed with a blade 3. The outer surface of the end of the connecting column 4 in the housing 1 is sleeved with a first bevel gear 5 fixedly connected to the connecting column 4. The first bevel gear 5 is meshed with the second bevel gear 8. The middle part of the side of the second bevel gear 8 facing away from the transmission shaft 7 is fixedly connected with a connecting shaft 18. When the permanent magnet motor 12 drives the connecting shaft 18 to rotate, the connecting shaft 18 drives the connecting column 4 to rotate through the second bevel gear 8 and the first bevel gear 5, and then the blade 3 rotates together, so as to achieve the purpose of adjusting the pitch.

[0028] A bearing 17 is sleeved on the connecting shaft 18. The bearing 17 is sleeved on the side of the connecting shaft 18 close to the second bevel gear 8 and is fixedly connected to the connecting shaft 18. Three connecting rods 2 are fixedly arranged in a circular shape and at equal intervals on the outer surface of the outer ring of the bearing 17. One end of the connecting rod 2 away from the bearing 17 is fixedly connected to the housing 1. The three connecting rods 2 and the bearing 17 limit the position of the connecting shaft 18.

[0029] A threaded hole 22 is provided in the middle of one side of the connecting shaft 18 away from the second bevel gear 8, and a threaded head 21 is connected to the inner thread of the threaded hole 22. The end of the threaded head 21 away from the connecting shaft 18 is fixedly connected to the output end of the permanent magnet motor 12. A support plate 10 is provided on one side of the permanent magnet motor 12. One end of the support plate 10 is fixed inside the housing 1. The end of the support plate 10 close to the second bevel gear 8 is fixedly connected to a connecting plate 9. The end of the connecting plate 9 away from the support plate 10 is fixedly connected to the housing 1. A rectangular opening 25 is provided on one side of the connecting plate 9. The connecting plate 9 and the support plate 10 are an integrally formed structure, and the connecting plate 9 and the support plate 10 are arranged at an angle of 90°. The rectangular opening 25 is provided on the connecting plate 9 to reduce the amount of materials used in the production of the connecting plate 9.

[0030] A T-slot 23 arranged along the length direction of the threaded head 21 is provided on one side of the support plate 10 facing the permanent magnet motor 12, and a plurality of ash leakage openings 24 are provided on the inner surface of the T-slot 23, and the plurality of ash leakage openings 24 are arranged equidistantly along the length direction of the T-slot 23. A T-slider 11 is fixedly connected to the outer surface of the permanent magnet motor 12, and the T-slider 11 is slidably installed in the T-slot 23. When it is necessary to use the permanent magnet motor 12 to drive the blade 3 to rotate to achieve variable pitch, the permanent magnet motor 12 is first controlled to reverse, and then the permanent magnet motor 12 drives the threaded head 21 to rotate in the threaded hole 22 and moves the threaded head 21 to the outside of the threaded hole 22, and then the permanent magnet motor 12 is driven to rotate in the threaded hole 22. The magnetic motor 12 moves in the direction away from the connecting shaft 18 until the threaded head 21 is separated from the threaded hole 22. During the movement, the permanent magnet motor 12 drives the T-shaped slider 11 to slide in the T-shaped slot 23, which plays a role in limiting the movement trajectory of the permanent magnet motor 12. Then the permanent magnet motor 12 is controlled to rotate forward, and the permanent magnet motor 12 drives the threaded head 21 to re-enter the threaded hole 22. At this time, the threaded head 21 is not completely connected to the connecting shaft 18, so the blade 3 does not rotate. Therefore, the process of the threaded head 21 completely entering the threaded hole 22 provides time for the permanent magnet motor 12 to start without load, thereby avoiding damage to the permanent magnet motor 12 due to excessive starting load.

[0031] A cylinder 15 is provided on the side of the permanent magnet motor 12 away from the thread head 21. The cylinder 15 is arranged along the length direction of the thread head 21. The end of the cylinder 15 away from the motor is open and fixedly connected to the support plate 13. The support plate 13 is fixed in the housing 1. A spring 26 is provided in the cylinder 15. A pressure plate 27 is provided on the side of the spring 26 away from the support plate 13. The pressure plate 27 is slidably installed in the cylinder 15. The end of the pressure plate 27 away from the spring 26 is fixedly connected to the push rod 16. The push rod 16 is away from the pressure plate 26. One end of the disk 27 extends to the outside of the cylinder 15 and contacts the permanent magnet motor 12. During the reversal of the permanent magnet motor 12, the permanent magnet motor 12 squeezes the push rod 16, and the push rod 16 drives the pressure plate 27 to move in the cylinder 15 and squeeze the spring 26. The spring 26 is elastically deformed by the squeezing. When the permanent magnet motor 12 rotates forward, under the action of the rebound force of the spring 26, it is convenient to make one end of the threaded head 21 fit in the threaded hole 22, which is conducive to re-threading the threaded head 21 with the connecting shaft 18.

[0032] As an embodiment of the present invention: the outer surface of the open end of the cylinder 15 is processed with external threads, and one end of the cylinder 15 processed with external threads is threadedly connected with a threaded sleeve 14, and the threaded sleeve 14 is fixedly connected to the support plate 13. The end of the cylinder 15 processed with external threads is screwed into the threaded sleeve 14, so that the cylinder 15 and the support plate 13 can be easily disassembled and assembled.

[0033] As an embodiment of the present invention: one end of the push rod 16 away from the pressure plate 27 is fixedly connected to a disc 28, and the disc 28 and the push rod 16 are an integrally formed structure. A rubber pad is glued to the side of the disc 28 facing away from the push rod 16 by glue. The disc 28 increases the contact range between the push rod 16 and the permanent magnet motor 12, and the design of the rubber pad realizes flexible contact between the disc 28 and the permanent magnet motor 12.

[0034] As an embodiment of the present invention: a bobbin 20 for hiding the threaded head 21 is sleeved on the threaded head 21, the bobbin 20 is sleeved on the connecting shaft 18 and is in sliding contact with the connecting shaft 18, the end of the bobbin 20 close to the permanent magnet motor 12 is fixedly connected to the threaded head 21, and the end of the bobbin 20 close to the connecting shaft 18 is fixedly connected to a tapered sleeve 19, the small head end of the tapered sleeve 19 is in contact with the surface of the connecting shaft 18, the tapered sleeve 19 and the bobbin 20 are an integrally formed structure, the bobbin 20 is fixed on the threaded head 21, and the bobbin 20 is sleeved on the connecting shaft 18, so that the threaded head 21 is hidden in the closed space formed by the bobbin 20 and the connecting shaft 18, which plays a role in preventing dust from arbitrarily adhering to the threaded head 21, and the tapered sleeve 19 is fixed on the bobbin 20, so that when the bobbin 20 moves along the surface of the connecting shaft 18, the tapered sleeve 19 shovels off the dust attached to the surface of the connecting shaft 18 to prevent the dust attached to the surface of the connecting shaft 18 from entering the bobbin 20.

[0035] Specific implementation method: When it is necessary to use the permanent magnet motor 12 to drive the blade 3 to rotate to achieve variable pitch, first control the permanent magnet motor 12 to reverse, and then the permanent magnet motor 12 drives the threaded head 21 to rotate in the threaded hole 22 and moves the threaded head 21 out of the threaded hole 22, and then the permanent magnet motor 12 moves in the direction away from the connecting shaft 18 until the threaded head 21 is separated from the threaded hole 22. During the movement, the permanent magnet motor 12 drives the T-shaped slider 11 to slide in the T-shaped slot 23, which plays a role in limiting the movement trajectory of the permanent magnet motor 12, and then control the permanent magnet motor 12 to rotate forward, and the permanent magnet motor 12 drives the threaded head 21 to re-enter the threaded hole 22. At this time The threaded head 21 is not completely connected to the connecting shaft 18, so the blade 3 does not rotate, so that the process of the threaded head 21 completely entering the threaded hole 22 provides time for the no-load starting of the permanent magnet motor 12, thereby preventing the permanent magnet motor 12 from being damaged due to excessive starting load. During the reversal of the permanent magnet motor 12, the permanent magnet motor 12 squeezes the push rod 16, and the push rod 16 drives the pressure plate 27 to move in the cylinder 15 and squeeze the spring 26. The spring 26 is elastically deformed by the squeezing. When the permanent magnet motor 12 rotates forward, under the action of the rebound force of the spring 26, it is convenient to make one end of the threaded head 21 fit in the threaded hole 22, which is conducive to re-threading the threaded head 21 with the connecting shaft 18.

[0036] Although this specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A permanent magnet direct drive wind turbine blade pitch control device, comprising a housing (1) and a transmission shaft (7) with one end fixed in the housing (1), characterized in that: The outer surface of one end of the transmission shaft (7) in the housing (1) is provided with three connecting columns (4) rotatably mounted in an annular shape and at equal intervals; the end of the connecting column (4) away from the transmission shaft (7) extends to the outside of the housing (1) and is provided with a blade (3); the outer surface of the end of the connecting column (4) in the housing (1) is provided with a first bevel gear (5) fixedly connected to the connecting column (4); the first bevel gear (5) is meshed with a second bevel gear (8); a connecting shaft (18) is fixedly connected to the middle portion of a surface of the second bevel gear (8) facing away from the transmission shaft (7); the connecting shaft (18) ) is rotatably mounted in the housing (1) through a connecting member, a threaded hole (22) is provided in the middle of a side of the connecting shaft (18) facing away from the second bevel gear (8), a threaded head (21) is threadedly connected to the threaded hole (22), an end of the threaded head (21) away from the connecting shaft (18) is fixedly connected to the output end of the permanent magnet motor (12), the permanent magnet motor (12) is slidably connected to the housing (1) through a supporting member, and a reset member for forcing the permanent magnet motor (12) to move in the direction of the second bevel gear (8) is provided on a side of the permanent magnet motor (12) facing away from the threaded head (21); The support member comprises a support plate (10), one end of the support plate (10) is fixed inside the housing (1), the end of the support plate (10) close to the second bevel gear (8) is fixedly connected to a connecting plate (9), the end of the connecting plate (9) away from the support plate (10) is fixedly connected to the housing (1), a T-shaped slot (23) arranged along the length direction of the thread head (21) is provided on a side of the support plate (10) facing the permanent magnet motor (12), a T-shaped slider (11) is fixedly connected to the outer surface of the permanent magnet motor (12), and the T-shaped slider (11) is slidably installed in the T-shaped slot (23); The reset member comprises a cylinder (15), wherein the cylinder (15) is arranged along the length direction of the threaded head (21); the end of the cylinder (15) away from the motor is open and fixedly connected to a support plate (13); the support plate (13) is fixed in the housing (1); a spring (26) is provided in the cylinder (15); a pressure plate (27) is provided on the side of the spring (26) away from the support plate (13); the pressure plate (27) is slidably installed in the cylinder (15); the end of the pressure plate (27) away from the spring (26) is fixedly connected to a push rod (16); the end of the push rod (16) away from the pressure plate (27) extends to the outside of the cylinder (15) and contacts the permanent magnet motor (12).

2. A permanent magnet direct drive wind turbine blade pitch control device according to claim 1, characterized in that: The connecting member comprises a bearing (17), the bearing (17) being sleeved on a side of a connecting shaft (18) close to the second bevel gear (8), the bearing (17) being fixedly connected to the connecting shaft (18), three connecting rods (2) being fixedly connected in an annular shape and equidistantly on the outer surface of an outer ring of the bearing (17), and one end of the connecting rod (2) away from the bearing (17) being fixedly connected to the housing (1).

3. The permanent magnet direct drive wind turbine blade pitch control device according to claim 1, characterized in that: The inner surface of the T-shaped groove (23) is provided with a plurality of ash leakage openings (24), and the plurality of ash leakage openings (24) are arranged at equal intervals along the length direction of the T-shaped groove (23).

4. The permanent magnet direct drive wind turbine blade pitch control device according to claim 1, characterized in that: A rectangular opening (25) is provided on one side of the connecting plate (9); the connecting plate (9) and the supporting plate (10) are an integrally formed structure, and the connecting plate (9) and the supporting plate (10) are arranged at an angle of 90°.

5. The permanent magnet direct drive wind turbine blade pitch control device according to claim 1, characterized in that: The outer surface of the open end of the cylinder (15) is processed with an external thread, and one end of the cylinder (15) processed with the external thread is threadedly connected to a threaded sleeve (14), and the threaded sleeve (14) is fixedly connected to the support plate (13).

6. A permanent magnet direct drive wind turbine blade pitch control device according to claim 1, characterized in that: The end of the push rod (16) away from the pressure plate (27) is fixedly connected with a disc (28), the disc (28) and the push rod (16) are an integrally formed structure, and a rubber pad is glued to the side of the disc (28) away from the push rod (16).

7. The permanent magnet direct drive wind turbine blade pitch control device according to claim 1, characterized in that: A bobbin (20) for hiding the threaded head (21) is sleeved on the threaded head (21); the bobbin (20) is sleeved on the connecting shaft (18) and is in sliding contact with the connecting shaft (18); one end of the bobbin (20) close to the permanent magnet motor (12) is fixedly connected to the threaded head (21); one end of the bobbin (20) close to the connecting shaft (18) is fixedly connected to a conical sleeve (19); a small head end of the conical sleeve (19) is in contact with the surface of the connecting shaft (18); and the conical sleeve (19) and the bobbin (20) are an integrally formed structure.

8. A permanent magnet direct drive wind turbine blade pitch control device according to claim 7, characterized in that: The outer surface of one end of the transmission shaft (7) located in the housing (1) is sleeved with a sleeve (6), and one end of the sleeve (6) is fixedly connected to the housing (1).

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