Shaft system of wind generating set and wind generating set

Abstract

The invention discloses a wind generating set shaft system and a wind generating set, and relates to the technical field of wind power generation equipment, the wind generating set shaft system comprises a wind power main shaft, a reduction gear box and a generator which are in transmission connection in sequence, and the wind power main shaft is connected with the reduction gear box through a first coupler; the reduction gear box is connected with the generator through a second coupler, at least one of the first coupler and the second coupler comprises a first connecting shaft, a second connecting shaft and an annular elastic tire, and the first connecting shaft and the second connecting shaft are connected to the two sides of the annular elastic tire; the wind generating set shaft system further comprises an elastic mechanism arranged in the annular elastic tire, the first connecting shaft is further connected to the second connecting shaft through the elastic mechanism, and the elastic mechanism extends in the radial direction of the first connecting shaft. And the displacement compensation in the radial direction is compensated by the elastic deformation of the elastic mechanism of the annular elastic tire.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation equipment, and in particular to a wind power generator set shaft system and a wind power generator set. Background Art

[0002] A wind turbine is a device that converts wind energy into electrical energy. It is the core component of a wind power generation system. A wind turbine captures wind energy through a wind rotor (blades), converts it into mechanical energy, and then converts the mechanical energy into electrical energy through a generator, which is ultimately transmitted to the power grid or directly supplied for use. The shaft system in a wind turbine is the core part that converts wind energy into mechanical energy and ultimately into electrical energy. It mainly includes the main shaft (rotor shaft), gearbox, coupling, generator, etc. The coupling is a component that connects the generator shaft and the gearbox shaft. It is used to transmit power and absorb axial displacement caused by misalignment or vibration between the shafts. The selection of the coupling is very important. It can effectively transmit torque while compensating for the shaft alignment error between the main shaft and the drive device, reducing vibration, and protecting other transmission components.

[0003] For example, the patent with the authorization announcement number CN207363829U and the authorization announcement date May 15, 2018, and its name is "A wind turbine high-speed shaft axial displacement and sway monitoring device", which discloses a wind turbine high-speed shaft axial displacement and sway monitoring device, which includes a displacement sensor, a proximity switch, a data acquisition station, a field server and several field browsers. There are two displacement sensors, which are axially fixedly installed on the same side of the brake disc on the high-speed shaft of the gearbox and symmetrically arranged on both sides of the high-speed shaft. The proximity switch is radially installed on the outside of the brake disc. The data acquisition station is connected to the displacement sensor and the proximity switch data respectively, and is connected to the field server through network data. The field browser is connected to the field server through network data. This patent can realize online measurement of the axial displacement of the brake disc and the sway waveform of the brake disc, display the amplitude, phase and frequency components of the waveform, and can timely detect early bearing failures. At the same time, it can diagnose the main shaft misalignment failure of the generator shaft and the gearbox shaft.

[0004] In the prior art, the rotor of a wind turbine is affected by changes in wind speed. Wind speed fluctuations may cause changes in the rotation speed of the wind turbine blades, thereby causing fluctuations in the mechanical load. This fluctuation will be transmitted to the transmission system, especially the coupling between the gear box and the generator. The coupling needs to adapt to load changes through a flexible connection. To solve this problem, the prior art uses a tire coupling to connect the gear box and the generator or to connect the wind turbine main shaft and the gear box. The tire coupling can provide axial displacement compensation, but the tire coupling, a type of axial compensation coupling, brings further problems. Its radial buffering capacity is weak, which often leads to aging maintenance or even scrapping due to excessive radial loads. Summary of the invention

[0005] The object of the present invention is to provide a wind turbine generator set shaft system and a wind turbine generator set to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions: A wind turbine generator set shaft system provided by the present invention includes a wind turbine main shaft, a reduction gear box and a generator which are sequentially connected in transmission, wherein the wind turbine main shaft and the reduction gear box are connected via a first coupling, and the reduction gear box and the generator are connected via a second coupling, and at least one of the first coupling and the second coupling includes a first connecting shaft, a second connecting shaft and an annular elastic tire, wherein the first connecting shaft and the second connecting shaft are connected to both sides of the annular elastic tire, and also include an elastic mechanism arranged inside the annular elastic tire, and the first connecting shaft is also connected to the second connecting shaft via the elastic mechanism, and the elastic mechanism extends radially along the first connecting shaft.

[0007] The above-mentioned wind turbine shaft system is characterized in that a section of the first connecting shaft extending into the annular elastic tire is a first connecting section, a section of the second connecting shaft extending into the annular elastic tire is a second connecting section, and the radial dimension of the inner wall of the first connecting section is greater than the radial dimension of the outer wall of the second connecting section.

[0008] In the above-mentioned wind turbine generator set shaft system, the elastic mechanism is a spring.

[0009] In the above-mentioned wind turbine generator set shaft system, a protrusion is provided on the first connecting section, and a radial groove is provided on the second connecting shaft. The protrusion is located in the radial groove but does not contact the groove wall of the radial groove.

[0010] In the above-mentioned wind turbine shaft system, when the annular elastic tire is not damaged, the protrusion is located in the radial groove, and the side wall of the protrusion is not in contact with the side wall of the radial groove. When the annular elastic tire is damaged, the side wall of the protrusion is in contact with the side wall of the radial groove.

[0011] The above-mentioned wind turbine generator shaft system has a first groove symmetrically provided on the inner wall of the first connecting section, a first rotating plate is hinged in the first groove, the elastic mechanism is arranged on the first rotating plate, a first shielding plate is slidably provided in the first groove, the first shielding plate is used to shield the first rotating plate from rotating, a first extension portion is slidably provided on the first shielding plate, a groove body is provided on the protruding portion, the first extension portion extends into the groove body, an extrusion portion is provided on the first extension portion, the extrusion portion extends out of the groove body, and a first wedge-shaped surface is provided on one end of the extrusion portion extending out of the groove body.

[0012] The above-mentioned wind turbine shaft system has a second groove symmetrically provided on the outer wall of the second connecting section, a second rotating plate is hinged in the second groove, a second shielding plate is slidably provided in the second groove, the second shielding plate is used to shield the second rotating plate from rotating, a second extension portion is slidably provided on the second shielding plate, and a second wedge-shaped surface is provided on one end of the second extension portion.

[0013] In the above-mentioned wind turbine shaft system, a push plate is arranged on the side wall of the radial groove, a side surface of the push plate close to the second extension plate is a third wedge surface, and a side surface away from the second extension plate is a fourth wedge surface, the first wedge surface and the fourth wedge surface correspond to each other, and the second wedge surface and the third wedge surface correspond to each other.

[0014] In the above-mentioned shaft system of the wind turbine generator set, the extrusion portion squeezes the pushing plate and simultaneously causes the first shielding plate and the second shielding plate to slide synchronously.

[0015] A wind turbine generator set comprises the shaft system of any one of the wind turbine generator sets described above.

[0016] In the above technical scheme, the present invention provides a wind turbine shaft system and a wind turbine. During the power generation process of the wind turbine, the elastic deformation characteristics of the annular elastic tire can freely expand and contract in the axial direction to buffer and absorb vibrations and impacts caused by mechanical loads. The first connecting shaft and the second connecting shaft are connected to both sides of the annular elastic tire, and the first connecting shaft is connected to the second connecting shaft through an elastic mechanism, so that radial displacement compensation is compensated by the radial elastic deformation of the elastic mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application 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 recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 A schematic diagram of the structure of a coupling provided in an embodiment of the present invention; Figure 2 A cross-sectional view of a coupling provided by an embodiment of the present invention; Figure 3 A partial structural schematic diagram of a coupling provided in another embodiment of the present invention; Figure 4 A partial cross-sectional view of a coupling provided in accordance with another embodiment of the present invention; Figure 5 A partial cross-sectional view of the inner wall of the first connecting section provided in yet another embodiment of the present invention; Figure 6 A schematic structural diagram of a first rotating plate and a first shielding plate provided in yet another embodiment of the present invention; Figure 7 A partial cross-sectional view of a second connecting section provided in yet another embodiment of the present invention.

[0019] Description of reference numerals: 1. First connecting shaft; 1.1. First connecting section; 2. Second connecting shaft; 2.1. Second connecting section; 3. Annular elastic tire; 4. Elastic mechanism; 5. Protrusion; 6. Radial groove; 7. First groove; 8. First rotating plate; 9. First shielding plate; 9.1. First extension part; 10. Extrusion part; 11. Pushing plate; 12. Second groove; 13. Second rotating plate; 14. Second shielding plate; 15. Second extension part. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0021] Reference Figure 1-7 An embodiment of the present invention provides a shaft system of a wind turbine generator set, comprising a wind turbine main shaft, a reduction gearbox and a generator which are sequentially connected in transmission, wherein the wind turbine main shaft is connected to the reduction gearbox via a first coupling, and the reduction gearbox is connected to the generator via a second coupling, and at least one of the first coupling and the second coupling comprises a first connecting shaft 1, a second connecting shaft 2 and an annular elastic tire 3, wherein the first connecting shaft 1 and the second connecting shaft 2 are connected to both sides of the annular elastic tire 3, and further comprises an elastic mechanism 4 arranged inside the annular elastic tire 3, and the first connecting shaft 1 is also connected to the second connecting shaft 2 via the elastic mechanism 4, and the elastic mechanism extends radially along the first connecting shaft.

[0022] Specifically, the wind turbine main shaft is used for power transmission in the process of converting wind power into electrical energy. In wind power generation, wind power drives the blades to rotate, and the rotation of the blades drives the wind turbine main shaft to rotate. The wind turbine main shaft is connected to a reduction gearbox, and the reduction gearbox converts the low-speed rotation generated by the wind turbine main shaft into the high-speed rotation required by the generator through a gear system, thereby completing wind power generation. The wind turbine main shaft is connected to the reduction gearbox through a first coupling, and the reduction gearbox is connected to the generator through a second coupling. At least one of the first coupling and the second coupling includes a first connecting shaft 1, a second connecting shaft 2 and an annular elastic Tire 3, the first connecting shaft 1 and the second connecting shaft 2 are connected to both sides of the annular elastic tire 3, and the first connecting shaft 1 and the second connecting shaft 2 are both extended with a radial extension portion on a section outside the annular elastic tire 3, such as a disc structure, and a connecting mechanism such as a bolt is provided on the extension portion, so that the first connecting shaft 1 and the second connecting shaft 2 are threadedly connected to the annular elastic tire 3 through the connecting mechanism of the extension portion such as a bolt, and the annular elastic tire 3 is annular tire-shaped, and its material is elastic material, generally rubber, which is similar to the material of automobile tires, but has a relatively greater hardness. The above are all existing technologies and will not be repeated.In this embodiment, the section of the first connecting shaft 1 extending into the annular elastic tire 3 is the first connecting section 1.1, and the first connecting section 1.1 is a cylindrical structure. The section of the second connecting shaft 2 extending into the annular elastic tire 3 is the second connecting section 2.1. The radial dimension of the inner wall of the first connecting section 1.1 is greater than the radial dimension of the outer wall of the second connecting section 2.1, so that the first connecting section 1.1 is covered on the outer side of the second connecting section 2.1, and also includes an elastic mechanism 4 arranged inside the annular elastic tire 3. Preferably, the elastic mechanism 4 is a spring, and a plurality of spring annular arrays are arranged between the first connecting section 1.1 and the second connecting section 2.1, so that the springs are arranged radially along the first connecting shaft 1 and the second connecting shaft 2, so that the first connecting shaft 1 is also connected to the second connecting shaft 2 through the elastic mechanism 4, that is, one end of the spring is connected to the inner wall of the first connecting section 1.1, The other end of the spring is connected to the outer wall of the second connecting section 2.1, so that the first connecting shaft 1 and the second connecting shaft 2 do not extend into the annular elastic tire 3 to connect the wind turbine main shaft and the reduction gearbox, or the first connecting shaft 1 and the second connecting shaft 2 do not extend into the annular elastic tire 3 to connect the reduction gearbox and the generator. During the power generation process of the wind turbine, the elastic deformation characteristics of the annular elastic tire 3 can be relatively freely expanded and contracted in the axial direction, so that displacement compensation in the axial direction can be provided, but displacement in the radial direction can easily lead to uneven deformation of the elastic material and produce additional stress. Therefore, the innovation of the present invention lies in adding the first connecting shaft 1 and the second connecting shaft 2, and the first connecting shaft 1 and the second connecting shaft 2 are connected by an elastic mechanism 4. When the wind turbine is overloaded or poorly aligned and produces a large radial displacement, the elastic mechanism 4 will undergo elastic deformation to compensate for the radial displacement of the two shafts.

[0023] It should be noted that the annular elastic tire 3 and the elastic mechanism 4 themselves have the buffering capacity of axial buffering, radial buffering and even circumferential buffering, but the annular elastic tire 3 mainly has axial buffering and circumferential buffering, and its radial buffering capacity is weak. After long-term use, radial displacement often occurs. In this way, the elastic mechanism 4 is used to improve the shortcoming.

[0024] An embodiment of the present invention provides a wind turbine shaft system and a wind turbine. During the power generation process of the wind turbine, the elastic deformation characteristics of the annular elastic tire 3 can freely expand and contract in the axial direction to buffer and absorb vibrations and impacts caused by mechanical loads. The first connecting shaft 1 and the second connecting shaft 2 are connected to both sides of the annular elastic tire 3, and the first connecting shaft 1 is connected to the second connecting shaft 2 through an elastic mechanism 4, so that radial displacement compensation is compensated by the elastic deformation of the elastic mechanism 4.

[0025] In another embodiment provided by the present invention, Figure 3-4As shown, a protrusion 5 is provided on the first connecting section 1.1 of the first connecting shaft 1, and a radial groove 6 is provided on the second connecting shaft 2. The radial size of the radial groove 6 is larger than the radial size of the protrusion 5. The protrusion 5 is located in the radial groove 6 but the protrusion 5 does not contact the groove wall of the radial groove 6. A safety space is reserved between the two in the circumferential direction. When the first coupling or the second coupling is in a normal state, that is, when the annular elastic tire 3 is not damaged or aged, the protrusion 5 is located in the radial groove 6, but the side wall of the protrusion 5 does not fit the side wall of the radial groove 6. When the annular elastic tire 3 is damaged, its circumferential buffer space is not provided. The ability of the impact is reduced, so that the first connecting shaft 1 or the second connecting shaft 2 undergoes a greater degree of circumferential relative deflection when rotating. At this time, the side wall of the protrusion 5 will fit on the side wall of the radial groove 6, that is, the safety space on one side is eliminated. At this time, the protrusion 5 fits on the radial groove 6 so that the second connecting section 2.1 and the first connecting section 1.1 directly transmit the rotational motion. The purpose of such a setting is that when the annular elastic tire 3 is aged and damaged, the protrusion 5 can fit on the groove wall of the radial groove 6, so that even if the annular elastic tire 3 is damaged, it can continue to work for a period of time to wait for the next maintenance, instead of being immediately disconnected and causing loss of power generation capacity.

[0026] In another embodiment provided by the present invention, Figure 5-7 As shown, a first groove 7 is symmetrically provided on the inner wall of the first connecting section 1.1, and a first rotating plate 8 is hinged in the first groove 7 through a first rotating shaft. One end of the elastic mechanism 4 is connected to the first rotating plate 8, and a first shielding plate 9 is slidably provided in the first groove 7. The first shielding plate 9 is used to abut against the side of the first rotating plate 8 away from the first rotating shaft to prevent it from rotating. Preferably, a first extending portion 9.1 is provided on the first shielding plate 9, and the first extending portion 9.1 extends into the groove body (not shown in the figure) in the protruding portion 5. An extruding portion 10 is provided on the first extending portion 9.1, and the extruding portion 10 extends out of the groove body. The extruding portion 10 slides in the groove body when being squeezed, that is, at this time, the extruding portion 10 slides back into the groove body, and the sliding of the extruding portion 10 drives the first shielding plate 9 to slide to release the shielding of the first rotating plate 8. Preferably, one side surface of the extruding portion 10 is a first wedge-shaped surface, and a second groove 12 is mirror-imaged at the position of the second connecting section 2.1 corresponding to the first connecting section 1.1, as shown Figure 7As shown, that is, the second rotating plate 13 is hingedly connected in the second groove 12 through the second rotating shaft, so that one end of the elastic mechanism 4 is arranged on the first rotating plate 9, and the other end of the elastic mechanism 4 is arranged on the second rotating plate 13, and a second shielding plate 14 is slidably arranged in the second groove 12, and a second extending portion 15 is arranged on the second shielding plate 14, and a side surface of the second extending portion 15 extending out of the second groove 12 is a second wedge-shaped surface, and a pushing plate 11 is arranged on the side wall of the radial groove 6, and wedge-shaped surfaces are arranged at both ends of the pushing plate 11, wherein the wedge-shaped surface at one end close to the second extending portion 15 is the third wedge-shaped surface, and the wedge-shaped surface at one end away from the second extending portion 15 is the fourth wedge-shaped surface, the first wedge-shaped surface and the fourth wedge-shaped surface correspond to each other, and the second wedge-shaped surface and the third wedge-shaped surface correspond to each other, so that the protrusion 5 fits in the radial groove 6. When the extrusion portion 10 is on the groove wall of the groove 6, the first wedge surface on the extrusion portion 10 will squeeze the fourth wedge surface. At this time, the extrusion portion 10 is extended back into the groove body by the extrusion force, and the push plate 11 will radially slide on the side wall of the radial groove 6, so that the third wedge surface of the push plate 11 will squeeze the second wedge surface, so that the second extension portion 15 will slide, that is, the sliding of the extrusion portion 10 will drive the first baffle plate 9 to slide to release the obstruction of the first rotating plate 8, and the sliding of the second extension portion 15 will drive the second baffle plate 14 to slide to release the obstruction of the second rotating plate 13. At this time, the first rotating plate 8 and the second rotating plate 13 will both rotate. At this time, the elastic mechanism 4 on the first rotating plate 8 and the second rotating plate 13 is pulled into an inclined shape to adapt to the deviation caused by the aging annular elastic tire. In this way, when the annular elastic tire 3 is aged and damaged, the elastic mechanism can provide circumferential displacement compensation through elastic deformation.

[0027] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A wind turbine generator set shaft system, comprising a wind turbine main shaft, a reduction gear box and a generator which are sequentially connected in transmission, wherein the wind turbine main shaft is connected to the reduction gear box via a first coupling, the reduction gear box is connected to the generator via a second coupling, at least one of the first coupling and the second coupling comprises a first connecting shaft, a second connecting shaft and an annular elastic tire, the first connecting shaft and the second connecting shaft are connected to both sides of the annular elastic tire, characterized in that: It also includes an elastic mechanism disposed inside the annular elastic tire. The first connecting shaft is also connected to the second connecting shaft through the elastic mechanism. The elastic mechanism extends radially along the first connecting shaft.

2. The shaft system of the wind turbine generator set according to claim 1, characterized in that: A section of the first connecting shaft extending into the annular elastic tire is a first connecting section, a section of the second connecting shaft extending into the annular elastic tire is a second connecting section, and a radial dimension of an inner wall of the first connecting section is greater than a radial dimension of an outer wall of the second connecting section.

3. The shaft system of the wind turbine generator set according to claim 1, characterized in that: The elastic mechanism is a spring.

4. The shaft system of the wind turbine generator set according to claim 2, characterized in that: The first connecting section is provided with a protrusion, the second connecting shaft is provided with a radial groove, the protrusion is located in the radial groove but the protrusion does not contact the groove wall of the radial groove.

5. The shaft system of the wind turbine generator set according to claim 4, characterized in that: When the annular elastic tire is not damaged, the protrusion is located in the radial groove, and the side wall of the protrusion does not fit the side wall of the radial groove. When the annular elastic tire is damaged, the side wall of the protrusion fits the side wall of the radial groove.

6. The shaft system of the wind turbine generator set according to claim 5, characterized in that: The first connecting section has an inner wall symmetrically provided with a first groove, a first rotating plate hinged in the first groove, the elastic mechanism being arranged on the first rotating plate, a first shielding plate being slidably arranged in the first groove, the first shielding plate being used to shield the first rotating plate from rotating, a first extending portion being slidably arranged on the first shielding plate, a groove body being arranged on the protruding portion, the first extending portion extending into the groove body, an extruding portion being arranged on the first extending portion, the extruding portion extending out of the groove body, and a first wedge-shaped surface being arranged on one end of the extruding portion extending out of the groove body.

7. The shaft system of the wind turbine generator set according to claim 6, characterized in that: A second groove is symmetrically provided on the outer wall of the second connecting section, a second rotating plate is hinged in the second groove, a second shielding plate is slidably arranged in the second groove, the second shielding plate is used to shield the second rotating plate from rotating, a second extending portion is slidably arranged on the second shielding plate, and a second wedge-shaped surface is arranged on one end of the second extending portion.

8. The shaft system of the wind turbine generator set according to claim 7, characterized in that: A push plate is arranged on the side wall of the radial groove, a side surface of the push plate close to the second extension plate is a third wedge surface, and a side surface away from the second extension plate is a fourth wedge surface, the first wedge surface and the fourth wedge surface correspond to each other, and the second wedge surface and the third wedge surface correspond to each other.

9. The shaft system of the wind turbine generator set according to claim 8, characterized in that: The pressing portion presses the pushing plate and simultaneously causes the first shielding plate and the second shielding plate to slide synchronously.

10. A wind turbine generator set, characterized in that: It comprises the shaft system of the wind turbine generator set as claimed in any one of claims 1 to 9.

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