Offshore wind turbine tower blade support shaft protection device and wind power equipment

Abstract

The application relates to a protection device for a supporting rotating shaft of a wind turbine tower blade and a wind power equipment, which comprises a first connecting seat and a second connecting seat, the first connecting seat and the second connecting seat are both annular structures sleeved on the supporting rotating shaft, the first connecting seat is used for being fixedly connected to a blade hub, and the second connecting seat is used for being fixedly connected to a cabin shell; the first connecting seat and the second connecting seat are spaced apart, and a sleeve cylinder extending from the first connecting seat to the second connecting seat and abutting against a side surface of the second connecting seat is connected to the first connecting seat. According to the technical scheme, external air continuously passes through during the operation of the wind power equipment, the position contact between air and the supporting rotating shaft and the wind turbine tower cabin shell is reduced, and the deposition amount of salt particles in the air at the position is reduced; the generated heat can be discharged through the continuous air circulation, the heat accumulation is reduced, the damage to the sealing material filled at the position is reduced, the service life of the sealing material is prolonged, and the maintenance workload is reduced.

Description

Technical Field

[0001] This invention relates to the field of external environmental protection technology for wind power equipment, specifically to a protective device for the rotor shaft of an offshore wind turbine blade support and wind power equipment. Background Technology

[0002] Offshore or coastal wind power equipment is located in a relatively harsh natural environment. The salt spray content in the sea area is high, and salt particles can cause corrosion damage to wind power equipment, reducing the intensity of maintenance work and the service life of wind power equipment.

[0003] The main structure of offshore wind power equipment typically includes a wind turbine tower and blades. The blades are fixedly connected to the hub, and the hub is connected to the power generation components inside the wind turbine tower nacelle via a support shaft. The support shaft is an extension structure on the wind turbine tower and rotates with the outer shell of the wind turbine tower nacelle, with a gap between them.

[0004] Salt particles in salt spray can easily deposit in gaps and penetrate into the nacelle of a wind turbine, affecting the power generation components inside. The existing solution is to increase the sealing effect of this location by filling it with sealant. However, because the blades of wind turbines are huge and heavy, the sealant is easily damaged and requires frequent maintenance, which is a lot of work. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a protective device for the support shaft of the offshore wind turbine blades, so as to solve the problem that the existing technology uses filling sealing material to increase the sealing effect between the support shaft and the outer shell of the wind turbine nacelle. However, due to the large size and weight of the wind turbine blades, the filling sealing material is easily damaged and requires frequent maintenance, resulting in a large workload.

[0006] This invention is achieved through the following technical solution:

[0007] A protective device for the rotor support shaft of an offshore wind turbine tower includes a first connecting seat and a second connecting seat. Both the first connecting seat and the second connecting seat are annular structures that fit around the rotor support shaft. The first connecting seat is fixedly connected to the rotor hub, and the second connecting seat is fixedly connected to the nacelle shell. During the operation of the wind power equipment, the second connecting seat is in a fixed state, and the first connecting seat is in a rotating state.

[0008] There is a gap between the first connecting seat and the second connecting seat, and an outer sleeve that extends toward the second connecting seat and abuts against the side of the second connecting seat and is tubular is connected to the first connecting seat. The outer sleeve is coaxially arranged with the support shaft, and a cavity is formed between the inner wall of the outer sleeve and the outer wall of the support shaft.

[0009] An annular partition is provided inside the cavity, and the annular partition divides the cavity into a front chamber and a rear chamber. An inner sleeve extending towards and fixedly connected to the second connecting seat is connected to the inner edge of the annular partition.

[0010] The outer sleeve has multiple first through holes and multiple second through holes that penetrate the sidewalls and communicate with the front chamber and the rear chamber respectively;

[0011] The annular partition has several third through holes that connect the front chamber and the rear chamber. An airflow driving mechanism is provided in the rear chamber. The airflow driving mechanism is used to push air unidirectionally through the third through holes when the first connecting seat rotates.

[0012] Further specifying, the airflow driving mechanism includes a transmission part and a driving part;

[0013] The driving part consists of multiple impellers that are one-to-one with the multiple third through holes, and the impellers are connected to a drive shaft extending toward the second connecting seat;

[0014] The inner sleeve is connected to a support plate on its outer side wall, and the drive shaft passes through the support plate and is rotatably connected to the support plate.

[0015] The transmission unit is used to drive multiple transmission shafts to rotate synchronously in the same direction.

[0016] Further defining the transmission unit, the transmission unit includes an internal gear ring connected to the end of the outer sleeve facing the second connecting seat and a driven gear connected to the end of the transmission shaft away from the impeller, wherein the plurality of driven gears mesh with the internal gear ring.

[0017] Further specifying, the annular partition is connected to a plurality of guide tubes that are one-to-one with the plurality of third through holes, the plurality of guide tubes are respectively connected to the plurality of third through holes, and the plurality of impellers are respectively disposed in the plurality of guide tubes.

[0018] Further specifying, the outer sleeve is provided with a flexible sleeve, and the flexible sleeve is provided with a plurality of cross-shaped cuts opposite to a plurality of first through holes and a plurality of second through holes.

[0019] Further, the outer wall of the outer sleeve is provided with a plurality of reinforcing ribs extending along the length direction, and the first through hole and the second through hole are located between two adjacent reinforcing ribs.

[0020] Further specified, the end of the guide tube away from the annular partition is connected to a support frame, and the drive shaft passes through the support frame and rotates with the support frame.

[0021] Further, both the first connecting seat and the second connecting seat have annular grooves on their outer surfaces, and annular sealing rings are provided in the annular grooves, with the annular sealing rings protruding outside the annular grooves.

[0022] Furthermore, the outer sleeve, the annular partition, and the outer wall of the guide tube are all provided with a protective coating.

[0023] A wind power device includes a protective device for the rotor shaft supporting the blades of the aforementioned offshore wind turbine tower.

[0024] The beneficial effects of this invention are as follows:

[0025] This invention relates to a protective device for the blade support shaft of an offshore wind turbine tower and wind power equipment. When the wind power equipment is running, it can push the airflow unidirectionally through the third through hole. The first or second through hole serves as the air inlet, and the second or first through hole serves as the exhaust end. This allows external air to continuously pass through during the operation of the wind power equipment, reducing the positional contact between the air and the support shaft and the outer shell of the wind turbine tower nacelle, thereby reducing the amount of salt particles in the air deposited at that location.

[0026] Continuous air circulation can dissipate the generated heat, reducing heat accumulation, minimizing damage to the sealing material filling the area, extending the service life of the sealing material, and reducing maintenance workload.

[0027] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0028] Figure 1 This is the front view of the present invention;

[0029] Figure 2 This is a right view of the present invention;

[0030] Figure 3 This is the front view of the present invention;

[0031] Figure 4 for Figure 3 A schematic diagram of the cross-sectional structure of AA;

[0032] Figure 5 This is a schematic diagram of the connection structure between the first connecting seat and the outer sleeve;

[0033] Figure 6 This is a schematic diagram of the mating structure between the annular baffle and the impeller;

[0034] In the figure: 1. First connecting seat; 2. Second connecting seat; 3. Outer sleeve; 4. Annular partition; 5. Inner sleeve; 6. First through hole; 7. Second through hole; 8. Third through hole; 9. Impeller; 10. Drive shaft; 11. Support plate; 12. Internal gear ring; 13. Driven gear; 14. Guide pipe; 15. Flexible sleeve; 16. Cross-shaped cut; 17. Reinforcing rib; 18. Outer ring; 19. Inner ring; 20. Support rod; 21. Sealing ring. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0037] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0038] In the above description of the present invention, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is conventionally placed during use. These terms are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0039] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0040] Please see Figure 1-6The present invention provides a technical solution: a protective device for the rotor support shaft of an offshore wind turbine tower, including a first connecting seat 1 and a second connecting seat 2. Both the first connecting seat 1 and the second connecting seat 2 are annular structures that are fitted outside the rotor support shaft. The first connecting seat 1 is used to be fixedly connected to the rotor hub, and the second connecting seat 2 is fixedly connected to the nacelle shell. During the operation of the wind power equipment, the second connecting seat 2 is in a fixed state, and the first connecting seat 1 is in a rotating state.

[0041] There is a gap between the first connecting seat 1 and the second connecting seat 2, and an outer sleeve 3 extending towards the second connecting seat 2 and abutting against the side of the second connecting seat 2 and in the shape of a tube is connected to the first connecting seat 1. The outer sleeve 3 is coaxially arranged with the support shaft, and a cavity is formed between the inner wall of the outer sleeve 3 and the outer wall of the support shaft.

[0042] An annular partition 4 is provided inside the cavity, and the annular partition 4 divides the cavity into a front chamber and a rear chamber. An inner sleeve 5 is connected to the inner edge of the annular partition 4, extending towards the second connecting seat 2 and fixedly connected to the second connecting seat 2.

[0043] The outer sleeve 3 has multiple first through holes 6 and multiple second through holes 7 that penetrate the side wall and communicate with the front chamber and the rear chamber respectively;

[0044] The annular partition 4 has several third through holes 8 that connect the front chamber and the rear chamber. An airflow driving mechanism is provided in the rear chamber. The airflow driving mechanism is used to push air through the third through holes 8 in one direction when the first connecting seat 1 rotates.

[0045] The first connecting seat 1 and the second connecting seat 2 are fixedly connected to the impeller hub 9 and the nacelle shell, respectively. That is, during the operation of the wind power equipment, the second connecting seat 2 is in a fixed state and the first connecting seat 1 is in a rotating state.

[0046] The first connecting seat 1 is provided with an outer sleeve 3, and a cavity is formed between the outer sleeve 3 and the supporting rotating shaft. The cavity is divided into a front chamber and a rear chamber by an annular partition 4. The front chamber and the rear chamber are connected by a third through hole 8, and the front chamber and the rear chamber are connected to the outside through a first through hole 6 and a second through hole 7, respectively. That is, the first through hole 6, the third through hole 8 and the second through hole 7 are connected in sequence to form an air flow channel.

[0047] When the first connecting seat 1 rotates, i.e. when the wind power equipment is running, the airflow propulsion mechanism installed in the rear chamber can push the airflow unidirectionally through the third through hole 8. Then the first through hole 6 or the second through hole 7 serves as the air inlet, and the second through hole 7 or the first through hole 6 serves as the exhaust end, so that the external air continuously passes through during the operation of the wind power equipment, reducing the positional contact between the air and the support shaft and the outer shell of the wind power tower nacelle, thereby reducing the amount of salt particles in the air deposited at that position.

[0048] Meanwhile, the rotating contact part between the support shaft and the outer shell of the wind turbine nacelle is the part that bears the weight of the blades. This part will be subjected to extremely high pressure. When the support shaft rotates, the rotational friction under pressure will generate a lot of heat. Continuous air circulation can dissipate the generated heat, reduce heat accumulation, reduce damage to the sealing material filled in this part, improve the service life of the sealing material, and reduce maintenance workload.

[0049] In this embodiment, the airflow driving mechanism includes a transmission part and a driving part;

[0050] The pushing part consists of multiple impellers 9 that are one-to-one with the multiple third through holes 8, and the impellers 9 are connected to a drive shaft 10 extending toward the second connecting seat 2;

[0051] The outer wall of the inner sleeve 5 is connected to a support plate 11, and the drive shaft 10 passes through the support plate 11 and is rotatably connected to the support plate 11.

[0052] The transmission unit is used to drive multiple transmission shafts 10 to rotate synchronously in the same direction.

[0053] The impeller 9 is located on one side of the third through hole 8. When it rotates, it can create positive or negative pressure on one side of the third through hole 8 to push air through the third through hole 8.

[0054] The support plate 11 is connected to the inner sleeve 5 and the second connecting seat 2 in a fixed state, which is used to support the transmission shaft 10 and provide stable support for the impeller 9, so that the impeller 9 and the third through hole 8 remain in a fixed position.

[0055] In this embodiment, the transmission unit includes an internal gear ring 12 connected to one end of the outer sleeve 3 facing the second connecting seat 2 and a driven gear 13 connected to one end of the transmission shaft 10 away from the impeller 9. All of the driven gears 13 mesh with the internal gear ring 12.

[0056] Multiple driven gears 13 are connected to multiple drive shafts 10. The internal gear ring 12 and the outer sleeve 3 rotate with the first connecting seat 1. During the rotation, the multiple driven gears 13 will be driven to rotate, thereby driving the drive shaft 10 and the impeller 9 to rotate.

[0057] Multiple driven gears 13 mesh with the internal gear ring 12, meaning that under the drive of the internal gear ring 12, multiple driven gears 13 will rotate synchronously and in the same direction. Since the rotational speed of the internal gear ring 12 is the same as that of the blade, and the rotational speed is one revolution every 2 to 3 minutes, the gear ratio between the driven gears 13 and the external gear ring can be 50:1 to 80:1. That is, by increasing the gear ratio, the rotational speed of the transmission shaft 10 is increased, so that the impeller 9 can obtain a higher rotational speed, and a sufficient pressure difference can be formed on one side of the third through hole 8 to promote air flow.

[0058] In this embodiment, the annular partition 4 is connected to a plurality of guide pipes 14 that are one-to-one with the plurality of third through holes 8. The plurality of guide pipes 14 are respectively connected to the plurality of third through holes 8, and the plurality of impellers 9 are respectively disposed in the plurality of guide pipes 14.

[0059] The guide tube 14 is an extension of the third through hole 8, that is, it forms a covering structure outside the impeller 9, reducing the working space of the impeller 9 and facilitating the flow of air;

[0060] Among them, the blades of the impeller 9 can be helical, that is, when rotating, the helical blades rotate and compress the air flow in the guide tube 14, thereby improving the air propulsion effect.

[0061] In this embodiment, the outer sleeve 3 is covered with a flexible sleeve 15, and the flexible sleeve 15 is provided with a plurality of cross-shaped cutouts 16 opposite to a plurality of first through holes and a plurality of second through holes.

[0062] The flexible sleeve 15 can be made of rubber material. It wraps around the outer sleeve 3 and shields the outer sleeve 3, reducing contact with the outside air and thus reducing the impact of external environmental factors. In particular, by opening a cross-shaped slit at the opposite position of the first through hole and the second through hole, the flexible sleeve 15 is in a closed state due to its own elasticity when at rest, and can also be opened under the push of airflow, which can play a certain protective role for the internal structure.

[0063] In this embodiment, the outer wall of the outer sleeve 3 is provided with a plurality of reinforcing ribs 17 extending along the length direction, and the first through hole and the second through hole are located between two adjacent reinforcing ribs 17.

[0064] The outer sleeve 3 serves as the mounting part of the external gear ring. When it pushes the driven gear 13, it will be subjected to a reaction force. By setting the reinforcing rib 17, the structural strength can be increased and its structural stability can be improved.

[0065] In this embodiment, the end of the guide pipe 14 away from the annular partition 4 is connected to a support frame, and the drive shaft 10 passes through the support frame and rotates with the support frame.

[0066] The support frame includes an outer ring 18, an inner ring 19, and a support rod 20 connecting the outer ring 18 and the inner ring 19. The outer ring 18 is connected to the guide pipe 14, and the drive shaft 10 is rotatably connected inside the inner ring 19. The inner ring 19 is supported inside the outer ring 18 by the support rod 20, thus supporting the drive shaft 10. In other words, it cooperates with the support plate 11 to form two rotational support points on the drive shaft 10, thereby improving the rotational stability of the drive shaft 10.

[0067] In this embodiment, both the first connecting seat 1 and the second connecting seat 2 have annular grooves on their outer sides, and annular sealing rings 21 are provided in the annular grooves, with the annular sealing rings 21 protruding out of the annular grooves.

[0068] The outer surfaces of the first connecting seat 1 and the second connecting seat 2 serve as contact surfaces with the impeller hub 9 and the nacelle shell, respectively. By setting the annular sealing ring 21, the sealing effect between the impeller hub 9 and the nacelle shell can be improved, and the amount of salt spray carried in the air intruding into the connection can be reduced.

[0069] In this embodiment, the outer walls of the outer sleeve 3, the annular partition 4, and the guide pipe 14 are all provided with protective coatings. The protective layer can be a coating formed by composite paint or an electroplated metal layer, which reduces the corrosive effect of salt spray carried in the air and can protect the overall structure.

[0070] A wind power device includes a protective device for the rotor shaft supporting the blades of the aforementioned offshore wind turbine tower.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A protective device for the rotor shaft supporting the blades of an offshore wind turbine tower, characterized in that: It includes a first connecting seat and a second connecting seat. Both the first connecting seat and the second connecting seat are annular structures that are fitted around the supporting rotating shaft. The first connecting seat is used to be fixedly connected to the impeller hub, and the second connecting seat is fixedly connected to the nacelle shell. During the operation of the wind power equipment, the second connecting seat is in a fixed state, and the first connecting seat is in a rotating state. There is a gap between the first connecting seat and the second connecting seat, and an outer sleeve that extends toward the second connecting seat and abuts against the side of the second connecting seat and is tubular is connected to the first connecting seat. The outer sleeve is coaxially arranged with the support shaft, and a cavity is formed between the inner wall of the outer sleeve and the outer wall of the support shaft. An annular partition is provided inside the cavity, and the annular partition divides the cavity into a front chamber and a rear chamber. An inner sleeve extending towards and fixedly connected to the second connecting seat is connected to the inner edge of the annular partition. The outer sleeve has multiple first through holes and multiple second through holes that penetrate the sidewalls and communicate with the front chamber and the rear chamber respectively; The annular partition has several third through holes that connect the front chamber and the rear chamber. An airflow driving mechanism is provided in the rear chamber. The airflow driving mechanism is used to push air unidirectionally through the third through holes when the first connecting seat rotates.

2. The protective device for the rotor shaft supporting the blades of an offshore wind turbine tower according to claim 1, characterized in that: The airflow propulsion mechanism includes a transmission part and a propulsion part; The driving part consists of multiple impellers that are one-to-one with the multiple third through holes, and the impellers are connected to a drive shaft extending toward the second connecting seat; The inner sleeve is connected to a support plate on its outer side wall, and the drive shaft passes through the support plate and is rotatably connected to the support plate. The transmission unit is used to drive multiple transmission shafts to rotate synchronously in the same direction.

3. The protective device for the rotor shaft supporting the blades of an offshore wind turbine tower according to claim 2, characterized in that: The transmission unit includes an internal gear ring connected to the end of the outer sleeve facing the second connecting seat and a driven gear connected to the end of the transmission shaft away from the impeller, and the multiple driven gears mesh with the internal gear ring.

4. The protective device for the rotor shaft supporting the blades of an offshore wind turbine tower according to claim 2 or 3, characterized in that: The annular partition is connected to a plurality of guide tubes that are one-to-one with a plurality of third through holes. The plurality of guide tubes are respectively connected to the plurality of third through holes, and the plurality of impellers are respectively disposed in the plurality of guide tubes.

5. The protective device for the rotor shaft supporting the blades of an offshore wind turbine tower according to claim 1, characterized in that: The outer sleeve is provided with a flexible sleeve, and the flexible sleeve has multiple cross-shaped cuts that are opposite to multiple first through holes and multiple second through holes.

6. The protective device for the rotor shaft supporting the blades of an offshore wind turbine tower according to claim 1, characterized in that: The outer wall of the outer sleeve is provided with several reinforcing ribs extending along the length direction, and the first through hole and the second through hole are located between two adjacent reinforcing ribs.

7. The protective device for the rotor shaft supporting the blades of an offshore wind turbine tower according to claim 4, characterized in that: The end of the guide tube away from the annular partition is connected to a support frame, and the drive shaft passes through the support frame and rotates with the support frame.

8. The protective device for the rotor shaft supporting the blades of an offshore wind turbine tower according to claim 1, characterized in that: Both the first connecting seat and the second connecting seat have annular grooves on their outer surfaces, and annular sealing rings are provided in the annular grooves, with the annular sealing rings protruding out of the annular grooves.

9. The protective device for the rotor shaft supporting the blades of an offshore wind turbine tower according to claim 4, characterized in that: The outer sleeve, annular partition, and outer wall of the guide tube are all provided with protective coatings.

10. A wind power device, characterized in that: Includes a protective device for the blade support shaft of an offshore wind turbine as described in any one of claims 1 to 9.

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