Pure mechanical wind turbine generator yaw motor soft starting device and working method

Abstract

The invention discloses a pure mechanical wind turbine generator yaw motor soft starting device and a working method. The impact of a gear of a yaw gear box and a gear of a yaw gear ring in the yaw process is reduced. The problem that electromagnetism interferes with other electrical equipment in the wind turbine generator is solved; the technical scheme comprises an axial cam; an upper cam cover is arranged at the upper end of the axial cam, a lower cam cover is arranged at the lower end of the axial cam, a through hole is formed in the center of the upper cam cover, the guide pipe is arranged in the through hole, and the guide pipe and the through hole can rotate relatively; the input shaft is arranged on the guide pipe above the upper cam cover, and a transmission rod is mounted on the guide pipe below the upper cam cover; the side wall of the axial cam is provided with a slope type cam line groove, the slope type cam line groove is divided into a bent section and a horizontal section, and the transmission rod can move in the slope type cam line groove.

Description

Technical Field

[0001] The invention belongs to the technical field of wind power generation, and in particular relates to a pure mechanical wind turbine set yaw motor soft starting device and a working method. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] The yaw of a wind turbine is a key component to achieve maximum wind energy capture, and the yaw system control is an important part of the operation control of a wind turbine. The function of the yaw system is to track the change of wind direction, and to drive the nacelle to rotate after the yaw motor is working by controlling the soft starter or inverter, so as to ensure that the rotating surface of the wind rotor is perpendicular to the wind direction as much as possible.

[0004] During the operation of the wind turbine, the yaw drive drives the yaw gear ring through its own yaw drive, so that the wind wheel always faces the direction of the wind. In order to reduce the impact between the yaw gear box and the yaw gear ring, the current method is electromagnetic soft start, that is, using a frequency converter to change the input speed of the yaw motor from slow to fast. However, this method will generate a strong magnetic field and harmonic waves, which will affect other electrical equipment in the wind turbine, especially the low-voltage communication circuit, which is not conducive to the reliable operation of the wind turbine. Summary of the invention

[0005] In view of the above problems, the present invention provides a purely mechanical soft-start device and working method for the yaw motor of a wind turbine set, wherein an axial cam gradually starts to rotate under the action of a transmission rod, from slow to fast until it is synchronized with the speed of the yaw motor, thereby making the motor starting process smoother and avoiding the large current shock at the moment of yaw motor starting; it solves the problem of electromagnetic interference with other electrical equipment in the wind turbine set and avoids electromagnetic shock to the entire wind turbine set.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions: In a first aspect, the present invention provides a purely mechanical wind turbine yaw motor soft-start device, comprising an axial cam, an upper cam cover, a lower cam cover, a guide tube, a transmission rod, an input shaft, and an output shaft; The upper end of the axial cam is provided with the upper cam cover, the lower end of the axial cam is provided with a lower cam cover, the center of the upper cam cover is provided with a through hole, the guide tube is provided in the through hole, and the guide tube and the through hole can rotate relative to each other; the guide tube above the upper cam cover is provided with the input shaft, the input shaft is connected to the yaw motor, and the guide tube below the upper cam cover is provided with a transmission rod; the lower end surface of the lower cam cover is provided with an output shaft, and the output shaft is connected to the yaw gear box; A sloped cam groove is arranged on the side wall of the axial cam, the sloped cam groove is divided into a curved section and a horizontal section, and the transmission rod can move in the sloped cam groove.

[0007] Furthermore, the axial cam is a hollow circular tubular structure.

[0008] Furthermore, there are two inclined cam grooves, and the bending directions of the bending sections of the two inclined cam grooves are opposite.

[0009] Furthermore, both upper and lower ends of the axial cam are provided with end blind holes, and the end blind holes are provided with internal threads.

[0010] Furthermore, a through hole is provided at the center of the upper cam cover and the lower cam cover, the conduit is provided in the through hole, a bearing is provided between the upper cam cover and the conduit, and a bearing is also provided between the lower cam cover and the conduit.

[0011] Furthermore, a circle of flange holes is evenly arranged at the edge of the upper cam cover, and the number of the flange holes is the same as the number of the end blind holes.

[0012] Furthermore, the lower end of the conduit is flush with the lower end surface of the lower cam cover, and the lower cam cover is provided with an inner ring flange hole and an outer ring flange hole, the inner ring flange hole is connected to the output shaft, and the outer ring flange hole has the same number as the end blind holes.

[0013] Furthermore, a guide key is fixedly provided on the top of the conduit, and a keyway is provided inside the input shaft, and the number of the keyways is the same as the number of the guide keys; two long slot holes are provided on the conduit, and the two long slot holes are distributed up and down, and a transmission rod is provided in each of the long slot holes.

[0014] Furthermore, the transmission rod is a T-shaped structure consisting of a cross bar and a longitudinal bar. The cross bar is installed in the conduit through the long slot hole. The cross bar can reciprocate in the conduit. A spring is arranged between the cross bars of the two transmission rods. A roller is arranged at the end of the longitudinal rod. The roller can rotate around the axial direction of the longitudinal rod, and the roller rolls in the sloped cam groove.

[0015] In a second aspect, the present invention further provides a working method of a bending device, comprising the following steps: S1, when the yaw motor rotates forward, the torque is transmitted to the input shaft, the input shaft transmits the torque to the guide tube, and the guide tube transmits the torque to the transmission rod; S2, when the longitudinal rod of the transmission rod moves along the ramp-type cam groove on the axial cam, the axis cam will rotate from slow to fast until the axial cam and the yaw motor speed are synchronized; when the longitudinal rod of the transmission rod rotates to the end of the curved section, the axial cam and the input shaft of the yaw motor speed are synchronized; S3, when the rotation speeds of the axial cam and the input shaft of the yaw motor are synchronized, the longitudinal rod of the transmission rod slowly retreats along the cam line to the starting point of the horizontal section of the ramp-type cam groove; S4, the reverse torque from slow to fast is transmitted to the yaw gearbox through the output shaft connected to the lower cam cover.

[0016] Compared with the prior art, the present invention has the following advantages and positive effects: The present invention realizes the soft start of the yaw motor through a unique sloped cam groove design. When the transmission rod is located in the horizontal section of the sloped cam groove, the yaw motor is started but the axial cam does not rotate, thereby avoiding the large current shock at the moment of motor start and extending the service life of the motor. When the transmission rod moves to the curved section, the axial cam gradually begins to rotate under the action of the transmission rod, from slow to fast until it is synchronized with the yaw motor speed, making the motor start process smoother, reducing the impact of the gears of the yaw gearbox and the gears of the yaw gear ring during the yaw process, and reducing the occurrence of broken teeth. Compared with the traditional yaw soft start method, the present invention does not generate electromagnetic interference and has no electromagnetic shock to the entire wind turbine set.

[0017] The guide key on the top of the conduit of the present invention cooperates with the keyway inside the input shaft to ensure accurate transmission of torque. The design of the two long slots on the conduit and the T-shaped transmission rod enables the transmission rod to reciprocate in the conduit, while the roller at the end of the longitudinal rod rolls in the ramped cam groove, preventing the transmission rod from wearing or getting stuck with the ramped cam groove, thereby improving the reliability and service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0019] Figure 1 This is the overall structure diagram of the soft-start device for the yaw motor of a pure mechanical wind turbine generator set of the present invention; Figure 2 This is a structural diagram of the axial cam of the present invention; Figure 3 This is a structural diagram of the catheter of the present invention; Figure 4 It is a structural diagram of the transmission rod of the present invention; Figure 5 This is a structural diagram of the output shaft of the present invention.

[0020] In the figure: 1, axial cam; 1-1, ramped cam groove; 1-2, end blind hole; 2, upper cam cover; 3, lower cam cover; 4, guide tube; 4-1, long slot hole; 4-2, guide key; 5, transmission rod; 5-1, cross bar; 5-2, longitudinal bar; 5-3, roller; 6, input shaft; 7, output shaft; 7-1, output shaft flange hole. DETAILED DESCRIPTION It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0021] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof; This embodiment discloses a purely mechanical soft-start device for a yaw motor of a wind turbine generator set, such as Figure 1-Figure 5 As shown, it includes an axial cam 1, an upper cam cover 2, a lower cam cover 3, a guide tube 4, a transmission rod 5, an input shaft 6, and an output shaft 7; the upper end of the axial cam 1 is provided with the upper cam cover 2, the lower end of the axial cam 1 is provided with the lower cam cover 3, the upper cam cover 2 is provided with a through hole at the center position, the guide tube 4 is provided in the through hole, and the guide tube 4 and the through hole can rotate relative to each other; the guide tube 4 above the upper cam cover 2 is provided with the input shaft 6, the input shaft 6 is connected to the yaw motor, and the transmission rod 5 is installed on the guide tube 4 below the upper cam cover 2; the output shaft 7 is installed on the lower end surface of the lower cam cover 3, and the output shaft 7 is connected to the yaw gear box.

[0022] The axial cam 1 is a hollow circular tubular structure, and a ramped cam groove 1-1 is arranged on the side wall of the axial cam 1. The ramped cam groove 1-1 is divided into a curved section and a horizontal section. The processing trajectory of the ramped cam groove 1-1 is similar to a logarithmic function curve. The ramped cam groove 1-1 serves as a moving track of the transmission rod 5. When the input shaft 6 rotates, the transmission rod 5 moves in the ramped cam groove 1-1. When the transmission rod 5 moves in the horizontal section of the ramped cam groove 1-1, the axial cam 1 does not rotate, but at this time the yaw motor has been started. When the transmission rod When the transmission rod 5 moves to the bending section, the transmission rod 5 is gradually blocked by the axial cam 1 in the horizontal direction until it is completely blocked by the axial cam 1. In this process, the axial cam 1 gradually starts to rotate under the action of the transmission rod 5 until the axial cam 1 is synchronized with the rotation speed of the yaw motor; the upper and lower ends of the axial cam 1 are provided with end blind holes 1-2 for installing the upper cam cover 2 and the lower cam cover 3, and the upper cam cover 2 and the lower cam cover 3 are provided with flange holes corresponding to the end blind holes 1-2, and the blind holes are provided with internal threads for fastening the upper cam cover 2 and the lower cam cover 3 to the two ends of the axial cam 1 through fasteners.

[0023] The upper cam cover 2 and the lower cam cover 3 are both provided with through holes at their center positions, the conduit 4 is provided in the through holes, a bearing is provided between the upper cam cover 2 and the conduit 4, and a circle of flange holes are evenly provided at the edge position of the upper cam cover 2 for connecting the axial cam 1; a bearing is also provided between the lower cam cover 3 and the conduit 4, the lower end portion of the conduit 4 is flush with the lower end surface of the lower cam cover 3, and the lower cam cover 3 is provided with an inner ring flange hole and an outer ring flange hole, the inner ring flange hole is connected to the output shaft flange hole 7-1, and the outer ring flange hole is connected to the axial cam 1.

[0024] A guide key 4-2 is fixedly provided on the top of the conduit 4, and at least two guide keys 4-2 are provided. A keyway is provided inside the input shaft 6, and the number of the keyways is the same as the number of the guide keys 4-2. Two long slot holes 4-1 are provided on the conduit 4, and the two long slot holes 4-1 are distributed up and down. A transmission rod 5 is provided in each of the long slot holes 4-1, and the transmission rod 5 is a T-shaped structure composed of a cross bar 5-1 and a longitudinal bar 5-2. The cross bar 5-1 is installed in the conduit 4 through the long slot holes 4-1, and the cross bar 5-1 can reciprocate in the conduit 4. A roller 5-3 is provided at the end of the longitudinal bar 5-2, and the roller 5-3 can rotate around the axis of the longitudinal bar 5-2 The roller 5-3 rolls in the sloped cam groove 1-1 when the transmission rod 5 rotates, so as to prevent the transmission rod 5 from wearing or getting stuck with the sloped cam groove 1-1. A spring is arranged between the cross bars 5-1 of the two transmission rods 5, so that the two transmission rods 5 return to the starting point of the horizontal section of the sloped cam groove 1-1. There are two sloped cam grooves 1-1, and the positions of the sloped cam grooves 1-1 correspond to the positions of the two long slot holes 4-1. The bending directions of the bending sections of the two sloped cam grooves 1-1 are opposite, and the bending section of the sloped cam groove 1-1 located at the lower end of the axial cam 1 is bent upward, and the bending section of the sloped cam groove 1-1 located at the upper end of the axial cam 1 is bent downward.

[0025] When the input shaft 6 drives the conduit 4 to rotate, the transmission rod 5 on the conduit 4 moves in the sloped cam groove 1-1, and the roller 5-3 rolls along the arm of the sloped cam groove 1-1. When the transmission rod 5 moves in the horizontal section of the sloped cam groove 1-1, there is no reciprocating movement between the transmission rod 5 and the conduit 4; when the transmission rod 5 moves in the curved section of the sloped cam groove 1-1, there is a reciprocating movement between the transmission rod 5 and the conduit 4.

[0026] Working method: S1. When the yaw motor rotates forward, the torque is transmitted to the input shaft 6, the input shaft 6 transmits the torque to the guide tube 4, and the guide tube 4 transmits the torque to the transmission rod 5.

[0027] S2. When the longitudinal rod 5-2 of the transmission rod 5 moves along the sloped cam groove 1-1 on the axial cam 1, and when the transmission rod 5 moves in the horizontal section of the sloped cam groove 1-1, the axial cam 1 does not rotate, but the yaw motor has been started at this time. When the transmission rod 5 moves to the curved section, the horizontal rotation of the transmission rod 5 is gradually hindered by the axial cam 1 until it is completely hindered by the axial cam 1. In this process, the axial cam 1 gradually begins to rotate under the action of the transmission rod 5, and the axis cam will rotate from slow to fast until the axial cam 1 is synchronized with the yaw motor speed; when the longitudinal rod 5-2 of the transmission rod 5 rotates to the end point of the curved section, the speed of the axial cam 1 is synchronized with the input shaft 6 of the yaw motor.

[0028] S3. When the rotation speeds of the axial cam 1 and the input shaft 6 of the yaw motor are synchronized, the longitudinal rod 5-2 of the transmission rod 5 slowly retreats along the cam line to the starting point of the horizontal section of the sloped cam groove 1-1, and when the transmission rod 5 on the guide tube 4 moves in the sloped cam groove 1-1, the roller 5-3 rolls along the arm of the sloped cam groove 1-1.

[0029] S4. The reverse torque from slow to fast is transmitted to the yaw gearbox through the output shaft 7 connected to the lower cam cover 3.

[0030] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A purely mechanical wind turbine yaw motor soft starting device, characterized in that: It includes an axial cam, an upper cam cover, a lower cam cover, a guide tube, a transmission rod, an input shaft, and an output shaft; The upper end of the axial cam is provided with the upper cam cover, the lower end of the axial cam is provided with a lower cam cover, the center of the upper cam cover is provided with a through hole, the guide tube is provided in the through hole, and the guide tube and the through hole can rotate relative to each other; the guide tube above the upper cam cover is provided with the input shaft, the input shaft is connected to the yaw motor, and the guide tube below the upper cam cover is provided with a transmission rod; the lower end surface of the lower cam cover is provided with an output shaft, and the output shaft is connected to the yaw gear box; A sloped cam groove is arranged on the side wall of the axial cam, the sloped cam groove is divided into a curved section and a horizontal section, and the transmission rod can move in the sloped cam groove.

2. A purely mechanical wind turbine yaw motor soft-start device as claimed in claim 1, characterized in that: The axial cam is a hollow circular tubular structure.

3. A purely mechanical wind turbine yaw motor soft-start device as claimed in claim 2, characterized in that: There are two sloped cam grooves, and the bending directions of the bending sections of the two sloped cam grooves are opposite.

4. A purely mechanical wind turbine yaw motor soft-start device as claimed in claim 1, characterized in that: The upper and lower ends of the axial cam are both provided with end blind holes, and the end blind holes are provided with internal threads.

5. A purely mechanical wind turbine yaw motor soft-start device as claimed in claim 4, characterized in that: The upper cam cover and the lower cam cover are both provided with through holes at their center positions, the conduit is provided in the through holes, a bearing is provided between the upper cam cover and the conduit, and a bearing is also provided between the lower cam cover and the conduit.

6. A purely mechanical wind turbine yaw motor soft-start device as claimed in claim 5, characterized in that: A circle of flange holes is evenly arranged at the edge of the upper cam cover, and the number of the flange holes is the same as the number of the end blind holes.

7. A purely mechanical wind turbine yaw motor soft-start device as claimed in claim 5, characterized in that: The lower end of the conduit is flush with the lower end surface of the lower cam cover. The lower cam cover is provided with an inner ring flange hole and an outer ring flange hole. The inner ring flange hole is connected to the output shaft, and the outer ring flange hole has the same number as the end blind holes.

8. A purely mechanical wind turbine yaw motor soft-start device as claimed in claim 7, characterized in that: A guide key is fixedly arranged on the top of the conduit, and a keyway is arranged inside the input shaft, and the number of the keyways is the same as the number of the guide keys; two long slot holes are arranged on the conduit, and the two long slot holes are distributed up and down, and a transmission rod is arranged in each of the long slot holes.

9. A purely mechanical wind turbine yaw motor soft-start device as claimed in claim 8, characterized in that: The transmission rod is a T-shaped structure consisting of a cross bar and a longitudinal bar. The cross bar is installed in the conduit through the long slot hole. The cross bar can reciprocate in the conduit. A spring is arranged between the cross bars of the two transmission rods. A roller is arranged at the end of the longitudinal bar. The roller can rotate around the axial direction of the longitudinal bar and rolls in the sloped cam groove.

10. A working method of a purely mechanical wind turbine yaw motor soft-start device according to any one of claims 2 to 9, characterized in that: The following steps are involved: S1, when the yaw motor rotates forward, the torque is transmitted to the input shaft, the input shaft transmits the torque to the guide tube, and the guide tube transmits the torque to the transmission rod; S2, when the longitudinal rod of the transmission rod moves along the ramp-type cam groove on the axial cam, the axis cam will rotate from slow to fast until the axial cam and the yaw motor speed are synchronized; when the longitudinal rod of the transmission rod rotates to the end of the curved section, the axial cam and the input shaft of the yaw motor speed are synchronized; S3, when the rotation speeds of the axial cam and the input shaft of the yaw motor are synchronized, the longitudinal rod of the transmission rod slowly retreats along the cam line to the starting point of the horizontal section of the ramp-type cam groove; S4, the reverse torque from slow to fast is transmitted to the yaw gearbox through the output shaft connected to the lower cam cover.

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