Oil tank assembly, hub assembly and wind turbine generator set

Abstract

The utility model provides a kind of oil tank assembly, hub assembly and wind generating set, the oil tank assembly, for being installed in the hub of wind generating set, the oil tank assembly includes oil tank body, hollow shaft, support, external oil pipe, first bearing and second bearing, the support is used to be fixedly connected with hub, the hollow shaft is respectively arranged in the opposite sides of the oil tank body, the first bearing is sleeved in the outer periphery of the hollow shaft, so that the hollow shaft is rotatably connected with the support, the first end of the external oil pipe is inserted into the hollow shaft, the second bearing is located in the hollow shaft and is sleeved in the outer periphery of the first end of the external oil pipe, to make the external oil pipe rotatably connected with the hollow shaft. According to the utility model can provide a kind of oil tank assembly, realize the exhaust port of barometric tank installed in the hub always remains in upper during the rotation process of hub with blade.

Description

Technical Field

[0001] This application relates to the field of wind power generation technology, and more specifically to a fuel tank assembly, a hub assembly, and a wind turbine generator set. Background Technology

[0002] Currently, offshore wind turbines or large wind turbines typically use hydraulic pitch control, which has high load-bearing capacity and extremely fast response speed.

[0003] In existing technologies, the hydraulic oil tank of a hydraulic pitch system is typically located in the nacelle or hub. However, placing the hydraulic oil tank in the nacelle presents several challenges. First, the large distance between the tank and the blades results in excessively long piping, leading to redundant configurations and a higher risk of oil leakage. Second, the high temperature within the nacelle, coupled with insufficient heat dissipation, causes the oil temperature to easily exceed the threshold, accelerating oil oxidation and seal aging. Alternatively, placing the hydraulic oil tank in the hub causes it to rotate during wind turbine operation. While typically a positive pressure tank, the gases generated within it during hub rotation cannot be expelled, potentially causing gas corrosion in the hydraulic system. Furthermore, the nitrogen gas within the positive pressure tank experiences pressure changes with spatial and temperature variations, impacting the reliability and lifespan of the hydraulic system. Utility Model Content

[0004] To address the aforementioned problems in the prior art, this application proposes an oil tank assembly, a hub assembly, and a wind turbine generator set, so that the exhaust port of the positive pressure oil tank is always kept at the top.

[0005] According to one aspect of the present invention, a fuel tank assembly is provided for installation in the hub of a wind turbine generator set. The fuel tank assembly includes a fuel tank body, a hollow shaft, a bracket, an external fuel supply pipe, a first bearing, and a second bearing. The bracket is used for fixed connection with the hub. The hollow shaft is respectively disposed on opposite sides of the fuel tank body. The first bearing is sleeved on the outer periphery of the hollow shaft, so that the hollow shaft is rotatably connected to the bracket. The first end of the external fuel supply pipe is inserted into the hollow shaft. The second bearing is located in the hollow shaft and sleeved on the outer periphery of the first end of the external fuel supply pipe, so that the external fuel supply pipe is rotatably connected to the hollow shaft.

[0006] According to one aspect of this disclosure, oil delivery holes are provided on opposite sides of the oil tank body. The inner diameter of the oil delivery holes is smaller than the inner diameter of the hollow shaft. The oil delivery holes are located in the hollow shaft, so that the interior of the oil tank body is connected to the inner cavity of the hollow shaft and the external oil delivery pipe.

[0007] According to one aspect of this disclosure, the oil tank assembly further includes an axial end plate and a shaft seal. The axial end plate is fixedly connected to one end of the hollow shaft opposite to the oil tank body. The axial end plate has an axial through hole. The first end of the external oil supply pipe passes through the axial through hole and is inserted into the hollow shaft. The shaft seal is disposed on the outer periphery of the external oil supply pipe, located between the second bearing and the axial end plate, for sealing the gap between the external oil supply pipe and the axial end plate.

[0008] According to one aspect of this disclosure, the bracket is provided with a bearing seat, and at least two first bearings are provided, arranged side by side and spaced apart between the outer peripheral wall of the hollow shaft and the inner peripheral wall of the bearing seat along the length direction of the hollow shaft.

[0009] According to one aspect of this disclosure, the second bearing is provided as at least two, arranged side by side at intervals between the outer peripheral wall of the first end of the external oil pipe and the inner peripheral wall of the hollow shaft along the length direction of the hollow shaft.

[0010] According to one aspect of this disclosure, the fuel tank assembly further includes an internal fuel delivery pipe disposed inside the fuel tank body, wherein a first end of the internal fuel delivery pipe is connected to the fuel delivery through hole.

[0011] According to one aspect of this disclosure, at least one damping plate is provided in the tank body, and the damping plate is provided with a plurality of through holes.

[0012] According to one aspect of this disclosure, the top of the fuel tank body is provided with an exhaust port, the bottom of the fuel tank body is provided with a counterweight, and / or the fuel tank assembly further includes a heater disposed inside the fuel tank body.

[0013] According to one aspect of this disclosure, a code disk is provided on the second bearing for detecting the rotational speed of the inner ring of the second bearing relative to the oil tank body.

[0014] According to another aspect of the present invention, a wheel hub assembly is also provided, the wheel hub assembly including a wheel hub body and a fuel tank assembly as described above, the fuel tank assembly being mounted in the inner cavity of the wheel hub body via the bracket.

[0015] According to another aspect of the present invention, a wind turbine generator set is also provided, including the hub assembly as described above.

[0016] According to the oil tank assembly of this utility model, the oil tank body rotates relative to the hub as the hub rotates with the blades. The exhaust port of the oil tank body is always kept at the top and open to the atmosphere. The oil supply pipe connected to the motor pump group or pitch valve group rotates relative to the oil tank body. The oil suction pipe inside the oil tank body is always kept below the oil, thus maintaining the normal operation of the hydraulic pitch system. It also enables alarms when bearings are stuck, heating of the oil in low-temperature environments, and reduction or even elimination of oil surge phenomena. Attached Figure Description

[0017] Figure 1 A schematic diagram of the overall structure of the fuel tank assembly according to an embodiment of the present invention is shown; Figure 2 A first cross-sectional view of a fuel tank assembly according to an embodiment of the present invention is shown; Figure 3 A partial cross-sectional view of a fuel tank assembly according to an embodiment of the present invention is shown; Figure 4 A second cross-sectional view of a fuel tank assembly according to an embodiment of the present invention is shown; Figure 5 A schematic diagram of a support structure according to an embodiment of the present invention is shown.

[0018] Label Explanation: 100-Oil tank body; 110-Exhaust port; 120-Hollow shaft; 130-Oil supply through hole; 131-Oil outlet hole; 132-Oil return hole; 150-Heater; 160-Damping plate; 200-Bracket; 210-L-shaped bracket leg; 220-Bearing seat; 300-First bearing; 400-Internal oil supply pipe; 410-Internal oil suction pipe; 420-Internal oil return pipe; 500-External oil supply pipe; 510-External oil suction pipe; 520-External oil return pipe; 600-Second bearing; 710-Axial end plate; 720-Shaft seal. Detailed Implementation

[0019] Exemplary embodiments of the present invention will now be described more fully with reference to the accompanying drawings. However, it should not be construed as limiting the embodiments of the present invention to those described herein. The same reference numerals in the drawings denote the same structures, and therefore repeated descriptions of them will be omitted.

[0020] In this article, for ease of description and understanding, orientation (e.g., inside, outside, up, down) is defined based on the orientation during the use of the fuel tank assembly.

[0021] To address the problem of the fuel tank rotating with the wheel hub during the rotation of the existing wheel hub, this application provides a fuel tank assembly for installation in the inner cavity of the wheel hub.

[0022] The fuel tank assembly provided according to the embodiments of this application, such as Figure 1 As shown, the system includes a fuel tank body 100 and a support 200. The support 200 is fixedly connected to the inner cavity of the hub, and the opposite sides of the fuel tank body 100 are rotatably connected to the support 200. During the operation of the wind turbine generator, the hub rotates with the blades. At the same time, the hub drives the support 200 to rotate. Under the rotational connection between the fuel tank body 100 and the support 200, the weight of the fuel tank body 100 itself, and the weight of the oil, the fuel tank body 100 remains basically stationary and always maintains its original horizontal position.

[0023] In addition, an exhaust port 110 can be installed at the top of the fuel tank body 100 to allow the fuel tank body 100 to communicate with the atmosphere, and a counterweight can be installed at the bottom of the fuel tank body 100 to increase the weight of the fuel tank body 100, but this is not the only option. During the relative rotation of the fuel tank body 100 and the support 200, the counterweight works in conjunction with the weight of the fuel tank body 100 itself and the weight of the fuel to ensure that the exhaust port 110 is always at the top of the fuel tank body 100 and is always in communication with the atmosphere, thus balancing the fuel tank body 100 with the external air pressure and preventing fuel supply from being affected by air pressure issues.

[0024] Furthermore, an air filter is installed on the exhaust port 110 to prevent dust and particles in the air from entering the fuel tank body 100 while balancing the pressure between the fuel tank body 100 and the external air pressure, but this is not the only benefit.

[0025] According to an embodiment of this application, in order to achieve relative rotation between the fuel tank body 100 and the bracket 200, such as Figure 2 As shown, the fuel tank body 100 includes side plates disposed on opposite sides of the fuel tank body 100, and hollow shafts 120 are disposed on opposite sides of the fuel tank body 100, with one end of the hollow shaft 120 fixed to the outer surface of the side plate. Simultaneously, a first bearing 300 is sleeved on the outer periphery of the hollow shaft 120, and a bracket 200 is rotatably connected to the hollow shaft 120 via the first bearing 300, thereby enabling relative rotation with respect to the fuel tank body 100. As an example, the inner ring of the first bearing 300 is fixedly sleeved to the outer peripheral wall of the hollow shaft 120 via an interference fit, and the outer ring of the first bearing 300 is fixedly sleeved to the bracket 200 via an interference fit, thereby achieving relative rotation between the fuel tank body 100 and the bracket 200.

[0026] In this embodiment, the hollow shaft 120 is fixedly connected to the side plate of the oil tank body 100 by welding or flange connection, and the connection is sealed, but it is not limited to this.

[0027] Furthermore, a bearing housing 220 can be installed on the bracket 200, and at least two first bearings 300 are provided, arranged side by side and spaced apart between the outer peripheral wall of the hollow shaft 120 and the inner peripheral wall of the bearing housing 220 along the length of the hollow shaft 120. Using multiple bearings can distribute the load, increase system rigidity, and extend bearing life.

[0028] like Figure 5 As shown, the bracket 200 also includes an L-shaped bracket leg 210 integrally formed with the bearing seat 220. The side of the L-shaped bracket leg 210 that contacts the inner cavity of the wheel hub is provided with a through hole for fixing to the inner cavity of the wheel hub, but is not limited thereto.

[0029] According to embodiments of this application, such as Figure 3 As shown, the fuel tank assembly also includes external oil supply pipes 500 and second bearings 600 disposed on opposite sides of the fuel tank body 100. The first end of the external oil supply pipe 500 is inserted into the hollow shaft 120. The second bearing 600 is disposed within the hollow shaft 120 and sleeved on the outer periphery of the first end of the external oil supply pipe 500, thereby enabling the external oil supply pipe 500 to rotate rotatably with the hollow shaft 120 via the second bearing 600, and simultaneously allowing relative rotation between the external oil supply pipe 500 and the fuel tank body 100. As an example, the inner ring of the second bearing 600 is fixed to the outer peripheral wall of the external oil supply pipe 500 by an interference fit, and the outer ring of the second bearing 600 is fixed to the inner peripheral wall of the hollow shaft 120 by an interference fit, but this is not a limitation.

[0030] In addition, at least two second bearings 600 are provided, arranged side by side at intervals between the outer peripheral wall of the first end of the outer oil pipe 500 and the inner peripheral wall of the hollow shaft 120 along the length direction of the hollow shaft 120, to distribute the load of the bearing and extend the bearing life.

[0031] According to embodiments of this application, such as Figure 3 As shown, oil supply holes 130 are provided on opposite sides of the oil tank body 100. The inner diameter of the oil supply holes 130 is smaller than the inner diameter of the hollow shaft 120. The oil supply holes 130 are located in the hollow shaft 120, allowing the interior of the oil tank body 100 to communicate with the inner cavity of the hollow shaft 120 and with the external oil supply pipe 500, thus achieving communication between the interior of the oil tank body 100 and the external oil supply pipe 500. Since the second bearing 600 is located in the hollow shaft 120, and the inner cavity of the hollow shaft 120 is connected to the interior of the oil tank body 100, the oil in the oil tank body 100 can be used to lubricate the second bearing 600, avoiding the need for an additional lubrication structure on the hollow shaft 120. During the operation of the wind turbine generator set, the second bearing 600 can always be lubricated by oil, avoiding excessive wear and reducing later maintenance and replacement costs.

[0032] Furthermore, during the operation of the wind turbine generator set, friction between the first bearing 300 and the second bearing 600 and the hollow shaft 120 generates heat, which can easily lead to bearing deformation and a decline in mechanical performance. However, according to the oil tank assembly of the embodiment of this application, oil can enter the hollow shaft 120 to directly cool the second bearing 600 and the hollow shaft 120, thereby cooling the first bearing 300 and extending the service life of the first bearing 300 and the second bearing 600.

[0033] The oil tank assembly also includes an axial end plate 710 and a shaft seal 720. The axial end plate 710 is fixedly connected to one end of the hollow shaft 120 away from the oil tank body 100. The axial end plate 710 has an axial through hole. The first end of the external oil supply pipe 500 passes through the axial through hole and is inserted into the hollow shaft 120. The shaft seal 720 is located on the outer periphery of the external oil supply pipe 500, between the second bearing 600 and the axial end plate 710, and is used to seal the gap between the external oil supply pipe 500 and the axial end plate 710 to prevent oil leakage inside the oil tank body 100.

[0034] According to embodiments of this application, such as Figure 2 As shown, the oil tank assembly also includes an internal oil supply pipe 400 disposed inside the oil tank body 100. The first end of the internal oil supply pipe 400 is connected to the oil supply through hole 130 to realize the connection between the internal oil supply pipe 400 and the external oil supply pipe 500, thereby realizing the internal and external transportation of oil.

[0035] The internal oil supply pipe 400 is fixed to the side wall inside the oil tank body 100 by welding or flange connection, but is not limited to this. In addition, the inner diameter of the internal oil supply pipe 400 is greater than or equal to the diameter of the oil supply through hole 130.

[0036] Furthermore, the second end of the internal oil supply pipe 400 faces the bottom of the tank body 100. During the operation of the wind turbine generator set, when the tank body 100 and the support 200 rotate relative to each other, the second end of the internal oil supply pipe 400 is always submerged below the oil in the tank body 100, maintaining the normal operation of the hydraulic pitch system.

[0037] In addition, such as Figure 4As shown, the oil supply through-hole 130 may include an oil outlet 131 and an oil return hole 132 respectively disposed on opposite sides of the oil tank body 100. The oil outlet 131 is used to supply oil externally, and the oil return hole 132 is used to return oil internally. The external oil supply pipe 500 includes an external oil suction pipe 510 and an external oil return pipe 520. The first end of the external oil suction pipe 510 is connected to the oil outlet 131, and the first end of the external oil return pipe 520 is connected to the oil return hole 132. The internal oil supply pipe 400 includes an internal oil suction pipe 410 and an internal oil return pipe 420. The first end of the internal oil suction pipe 410 is connected to the oil outlet 131, and the first end of the internal oil return pipe 420 is connected to the oil return hole 132. In addition, the end of the external oil suction pipe 510 away from the oil tank body 100 is used to connect to the motor pump unit, and the end of the external oil return pipe 520 away from the oil tank body 100 is used to connect to the pitch valve assembly.

[0038] The oil in the oil tank body 100 enters the motor pump unit through the internal oil suction pipe 410, the oil outlet 131 and the external oil suction pipe 510, while the oil in the pitch valve group returns to the oil tank body 100 through the external oil return pipe 520, the oil return hole 132 and the internal oil return pipe 420, thus realizing the circulation and transportation of oil according to the fixed pipeline.

[0039] Furthermore, during wind turbine operation, the turbine rotor vibrates up and down due to changes in wind speed, causing the oil in the oil tank 100 to surge back and forth. According to embodiments of this application, to increase the resistance to movement of the oil in the oil tank 100, such as... Figure 2 As shown, at least one damping plate 160 can be installed inside the oil tank body 100. The damping plate 160 is fixed radially inside the oil tank body 100. The damping plate 160 has multiple through holes. Multiple damping plates 160 can be provided, and the multiple damping plates 160 are distributed axially at intervals inside the oil tank body 100, but are not limited to this. The damping plate 160 not only increases the resistance to oil movement, but also reduces or even eliminates oil surge phenomena, improves the service life of hydraulic oil, and solves the problem of gas corrosion in the hydraulic system.

[0040] According to an embodiment of this application, a code disk may be provided on the second bearing 600 to detect the rotational speed of the inner ring of the second bearing 600 relative to the oil tank body 100, compare it with the wheel hub speed, determine whether the bearing is stuck, and issue an alarm in time.

[0041] According to embodiments of this application, such as Figure 2As shown, a heater 150 can be fixedly installed inside the oil tank body 100. In low-temperature environments, the heater 150 heats the oil, ensuring that the various components of the hydraulic system operate at suitable oil viscosity conditions. Specifically, the position of the oil relative to the oil tank body 100 remains essentially unchanged. The heater 150 can be installed on the side wall of the oil tank body 100 near the second end of the internal oil suction pipe 410, ensuring that the heater 150 is always below the oil. One heater 150 can be installed on each side of the internal oil suction pipe 410, but this is not a limitation.

[0042] According to the oil tank assembly of this utility model, during the rotation of the hub and the blades, the oil tank body rotates relative to the hub, the exhaust port of the oil tank body is always kept at the top and open to the atmosphere, balancing the oil tank body and the external air pressure; the oil supply pipe connected to the motor pump group or pitch valve group rotates relative to the oil tank body; the oil suction pipe inside the oil tank body is always kept below the oil, maintaining the normal operation of the hydraulic pitch system; and it can also realize alarm when the bearing is stuck, realize oil heating in low temperature environment, and reduce or even eliminate oil surge phenomenon.

[0043] This application also provides a wheel hub assembly, which includes a wheel hub body and the aforementioned fuel tank assembly, wherein the fuel tank assembly is mounted in the inner cavity of the wheel hub body via a bracket 200.

[0044] This application also provides a wind turbine generator set, including the hub assembly described above.

[0045] The features, structures, or characteristics described in this invention can be combined in any suitable manner in one or more embodiments. In the above description, numerous specific details are provided to give a full understanding of embodiments of this invention. However, those skilled in the art will recognize that the technical solutions of this invention can be practiced without one or more of the specific details, or other methods, components, materials, etc., can be employed. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring various aspects of this invention.

Claims

1. A fuel tank assembly for installation in the hub of a wind turbine generator set, characterized in that, The fuel tank assembly includes a fuel tank body (100), a hollow shaft (120), a bracket (200), an external fuel line (500), a first bearing (300), and a second bearing (600). The bracket (200) is used to fix it to the hub. The hollow shaft (120) is respectively disposed on opposite sides of the fuel tank body (100). The first bearing (300) is sleeved on the outer periphery of the hollow shaft (120), so that the hollow shaft (120) is rotatably connected to the bracket (200). The first end of the external fuel line (500) is inserted into the hollow shaft (120). The second bearing (600) is located in the hollow shaft (120) and sleeved on the outer periphery of the first end of the external fuel line (500), so that the external fuel line (500) is rotatably connected to the hollow shaft (120).

2. The fuel tank assembly according to claim 1, characterized in that, Oil delivery holes (130) are provided on opposite sides of the oil tank body (100). The inner diameter of the oil delivery holes (130) is smaller than the inner diameter of the hollow shaft (120). The oil delivery holes (130) are located in the hollow shaft (120), so that the interior of the oil tank body (100) is connected to the inner cavity of the hollow shaft (120) and the external oil delivery pipe (500).

3. The fuel tank assembly according to claim 1, characterized in that, The oil tank assembly further includes an axial end plate (710) and a shaft seal (720). The axial end plate (710) is fixedly connected to the end of the hollow shaft (120) away from the oil tank body (100). The axial end plate (710) has an axial through hole. The first end of the external oil pipe (500) passes through the axial through hole and is inserted into the hollow shaft (120). The shaft seal (720) is disposed on the outer periphery of the external oil pipe (500) and is located between the second bearing (600) and the axial end plate (710) to seal the gap between the external oil pipe (500) and the axial end plate (710).

4. The fuel tank assembly according to claim 1, characterized in that, The bracket (200) is provided with a bearing seat (220), and at least two first bearings (300) are provided, which are arranged side by side and spaced apart between the outer peripheral wall of the hollow shaft (120) and the inner peripheral wall of the bearing seat (220) along the length direction of the hollow shaft (120).

5. The fuel tank assembly according to claim 1, characterized in that, The second bearing (600) is provided in at least two, arranged side by side at intervals between the outer peripheral wall of the first end of the outer oil pipe (500) and the inner peripheral wall of the hollow shaft (120) along the length direction of the hollow shaft (120).

6. The fuel tank assembly according to claim 2, characterized in that, The fuel tank assembly also includes an internal fuel delivery pipe (400) disposed inside the fuel tank body (100), and the first end of the internal fuel delivery pipe (400) is connected to the fuel delivery through hole (130).

7. The fuel tank assembly according to any one of claims 1-6, characterized in that, At least one damping plate (160) is provided in the tank body (100), and the damping plate (160) is provided with multiple through holes.

8. The fuel tank assembly according to any one of claims 1-6, characterized in that, The top of the tank body (100) is provided with an exhaust port (110), the bottom of the tank body (100) is provided with a counterweight, and / or the tank assembly further includes a heater (150) disposed inside the tank body (100).

9. The fuel tank assembly according to any one of claims 1-6, characterized in that, A code disk is provided on the second bearing (600) for detecting the rotational speed of the inner ring of the second bearing (600) relative to the oil tank body (100).

10. A wheel hub assembly, characterized in that, The wheel hub assembly includes a wheel hub body and a fuel tank assembly as described in any one of claims 1-9, the fuel tank assembly being mounted in the inner cavity of the wheel hub body via the bracket (200).

11. A wind turbine generator set, characterized in that, Includes the wheel hub assembly as described in claim 10.

Images