Gearbox oil injection plate device of onshore wind turbine generator
By installing a non-fully enclosed rear sealing plate structure in the wind turbine gearbox, the problem of bearing overheating caused by the inability of lubricating oil to drain in time is solved. This enables the oil to quickly remove heat, avoids downtime, and ensures the stable operation of the wind turbine.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DATANG (CHANGSHUN) NEW ENERGY CO LTD
- Filing Date
- 2025-06-24
- Publication Date
- 2026-05-05
AI Technical Summary
In traditional wind turbine gearboxes, the high-speed bearing lubricating oil cannot be discharged in time, resulting in the inability to effectively dissipate heat. This leads to an increase in bearing temperature, triggering an over-temperature alarm and shutdown.
Design an oil injection plate device for the gearbox of an onshore wind turbine, setting the rear sealing plate as a non-fully enclosed structure, allowing excessive oil to overflow from the opening of the rear sealing plate, quickly carrying away the heat of the high-speed bearing and avoiding over-temperature alarm shutdown.
With the non-fully enclosed rear sealing plate design, the oil can quickly overflow and carry away heat, avoiding bearing over-temperature alarms and ensuring the stable operation of the wind turbine.
Smart Images
Figure CN224201098U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of wind power generation technology, specifically relating to an oil injection plate device for a gearbox of an onshore wind turbine. Background Technology
[0002] The high-speed shaft (blade side) bearing of the gearbox is lubricated by forced lubrication. The lubricating oil is injected into the radially opened oil inlet hole of the oil spray plate assembly by the oil pump motor. The inner side of the oil spray plate assembly has an annular groove-shaped oil passage connecting the oil inlet hole and the oil spray hole. Therefore, the oil can be sprayed onto the high-speed bearing through the oil spray hole to lubricate the high-speed bearing. While lubricating the high-speed bearing, the oil flows through the gap of the rollers to the inner side of the outer ring, and then is discharged through the oil drain hole opened on the outer ring. The flowing oil carries away the heat and cools the bearing. When the oil cannot be discharged in time, oil trapping will occur. The oil cannot carry away the heat in time. The heat generated by the bearing is greater than the heat carried away by the oil, which will cause the bearing temperature to continue to rise until an over-temperature alarm is triggered and the machine is shut down. Utility Model Content
[0003] To address the problems mentioned in the background section, this invention provides an oil injection plate device for an onshore wind turbine gearbox. The rear sealing plate is designed as a non-fully enclosed structure, allowing excess oil to quickly overflow from the opening in the rear sealing plate, rapidly dissipating heat from the high-speed bearing and preventing over-temperature alarms and shutdowns.
[0004] To achieve the above objectives, this utility model provides the following technical solution: a fuel injection plate device for a gearbox of an onshore wind turbine, comprising a high-speed bearing and a fuel injection plate assembly installed on the inner partition of the gearbox. The fuel injection plate assembly has an oil inlet hole and an oil injection hole connected through an inner groove. The outer ring of the high-speed bearing has an oil outlet hole that penetrates the outer ring. The rear sealing plate of the fuel injection plate assembly is a non-fully enclosed structure.
[0005] As a preferred embodiment of the fuel injection plate device for the gearbox of an onshore wind turbine according to this utility model, the rear sealing plate is provided through the lower side.
[0006] As a preferred embodiment of the fuel injection plate device for the gearbox of an onshore wind turbine according to this utility model, a semi-circular through structure is provided on the lower side of the rear sealing plate.
[0007] As a preferred embodiment of the oil spraying plate device for the gearbox of the onshore wind turbine of this utility model, the number of oil spraying holes is two, one of which sprays oil onto the rollers of the high-speed bearing, and the other sprays oil onto the baffle of the high-speed bearing.
[0008] As a preferred embodiment of the oil injection plate device for the gearbox of the onshore wind turbine of this utility model, an oil baffle is installed on the side of the internal partition of the gearbox facing the column shaft.
[0009] As a preferred embodiment of the oil injection plate device for the gearbox of an onshore wind turbine according to this utility model, one end of the oil baffle shell is sealed to the outer ring of the high-speed bearing through a sealing ring.
[0010] In a preferred embodiment of the oil injection plate device for a gearbox of an onshore wind turbine according to this utility model, the lowest point of the outer baffle of the oil baffle shell is higher than the lowest point of the inner diameter of the outer ring of the high-speed bearing.
[0011] Compared with the prior art, the beneficial effects of this utility model are: the rear seal plate in the traditional oil spray plate assembly is in a fully enclosed state, and the oil can only be discharged from the oil drain hole and then collected. By setting the rear seal plate to a non-fully enclosed structure, excess oil can quickly overflow from the opening of the rear seal plate, quickly carrying away the heat of the high-speed bearing and avoiding the bearing over-temperature alarm shutdown. Attached Figure Description
[0012] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:
[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0014] Figure 2 This is a schematic diagram of the existing structure of the paint spray plate assembly in this utility model;
[0015] Figure 3 This is a schematic diagram showing the location of the oil injection hole in this utility model;
[0016] Figure 4 This is a schematic diagram of the improved structure of the rear sealing plate in this utility model;
[0017] Figure 5 This is a schematic diagram showing the location of the oil inlet hole in this utility model;
[0018] Figure 6 This is a schematic diagram of the semi-annular structure of the rear sealing plate in this utility model;
[0019] Figure 7 This is a schematic diagram of the assembly structure of the collection shell in this utility model;
[0020] In the picture:
[0021] 1. Gearbox internal partition; 2. High-speed bearing; 3. Column shaft; 4. Oil drain hole; 5. Oil spray plate assembly; 6. Rear seal plate; 7. Oil inlet hole; 8. Oil spray hole; 9. Oil baffle shell; 10. Sealing ring; 11. Collection shell; 12. Recovery pipe. Detailed Implementation
[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0023] like Figures 1-7 As shown:
[0024] A fuel injection plate device for a gearbox of an onshore wind turbine includes a high-speed bearing 2 and a fuel injection plate assembly 5 installed on a partition 1 inside the gearbox. The fuel injection plate assembly 5 has an oil inlet hole 7 and an oil injection hole 8 connected by an inner groove. The outer ring of the high-speed bearing 2 has an oil outlet hole 4 that penetrates the outer ring. The rear sealing plate 6 of the fuel injection plate assembly 5 is a non-fully enclosed structure.
[0025] The improved prototype of this technology can refer to the Nanjing High Speed Gear FD2250BD-01-00R1 gearbox. This gearbox can be used as the transmission module of a 2.0MW wind turbine. When the high-speed shaft (blade side) bearing of the gearbox is lubricated, there is an oil trapping phenomenon. The lubricating oil cannot be discharged in time, which means that the heat generated by the high-speed shaft (blade side) bearing of the gearbox cannot be carried away in time. This leads to the wind turbine reporting a high bearing temperature alarm, which in turn causes the turbine to shut down.
[0026] Research revealed that the high-speed shaft (blade side) bearing of the gearbox is lubricated by forced lubrication. The lubricating oil is injected into the radially opened oil inlet 7 of the oil spray plate assembly 5 by the oil pump motor. The inner side of the oil spray plate assembly 5 has an annular groove-shaped oil passage connecting the oil inlet 7 and the oil spray hole 8. Therefore, the oil can be sprayed onto the high-speed bearing 2 through the oil spray hole 8 to lubricate the high-speed bearing 2. While lubricating the high-speed bearing 2, the oil flows through the gap of the rollers to the inner side of the outer ring and is then discharged through the oil drain hole 4 opened on the outer ring. The flowing oil carries away the heat and cools the bearing. When the oil cannot be discharged in time, oil trapping will occur. The oil cannot carry away the heat in time. The heat generated by the bearing is greater than the heat carried away by the oil, which will cause the bearing temperature to continue to rise until an over-temperature alarm is triggered and the machine stops.
[0027] The oil has both lubricating and heat exchange functions. As the rotational speed of the roller shaft 3 increases, the heat generated also increases. However, the increase in the amount of oil required for lubrication is less than the increase in the amount of oil required for heat dissipation. The rate at which the oil can pass through the gap between the rollers is limited, and increasing the amount of oil will lead to difficulties in oil drainage.
[0028] The wind turbine gearbox consists of two parts: a planetary gearbox and a parallel gearbox. The high-speed shaft (blade side) bearing is located between the planetary gearbox and the parallel gearbox. In other words, the high-speed bearing 2 is installed in the partition 1 inside the gearbox. The two gearboxes are spatially separated by the oil spray plate assembly 5. In the traditional oil spray plate assembly 5, the rear sealing plate 6 is fully enclosed, and the oil can only be discharged from the oil drain hole 4 and then collected. By setting the rear sealing plate 6 to a non-fully enclosed structure, excess oil can quickly overflow from the opening of the rear sealing plate 6, quickly carrying away the heat of the high-speed bearing 2 and avoiding the bearing over-temperature alarm shutdown.
[0029] For different gearbox models, if the bearing lubricating oil and the gearbox oil can be shared, the oil passing through the opening of the rear sealing plate 6 can flow directly into the planetary gearbox to achieve lubrication circulation. If the bearing lubricating oil and the gearbox oil cannot be shared, an oil collection structure needs to be installed, such as a collection shell 11. The collection shell 11 is sealed to the oil spray plate assembly 5 through a sealing ring 10. The bottom inner side of the collection shell 11 is connected to a recovery pipe 12 for transporting the overflowing oil to the oil circulation system.
[0030] In an optional embodiment, the lower side of the rear cover plate 6 is provided through.
[0031] In this embodiment, the oil generally accumulates on the lower part of the high-speed bearing 2, so the lower side of the rear sealing plate 6 is provided through it.
[0032] In an optional embodiment, a semi-annular through-hole structure is provided on the lower side of the rear cover plate 6.
[0033] In this embodiment, for a gearbox where the bearing lubricating oil and the gearbox oil can be shared, the lower side of the rear sealing plate 6 is set as a semi-circular through structure. The oil flow rate is relatively stable, and splashing is less likely to occur during discharge. Splashing of oil in the gearbox can easily cause uneven oil distribution and unstable oil film. The semi-circular opening can continuously and stably discharge oil, which can help form a more continuous and stable oil film on the surface of the component and enhance the lubrication effect.
[0034] In an optional embodiment, there are two oil spray holes 8, one of which sprays oil onto the rollers of the high-speed bearing 2, and the other sprays oil onto the baffle of the high-speed bearing 2.
[0035] In this embodiment, one of the oil spray holes 8 sprays oil onto the rollers of the high-speed bearing 2, which can directly and effectively lubricate and cool the rollers. The other oil spray hole 8 sprays oil onto the baffle of the high-speed bearing 2, which can form a flowing oil pool and enhance the lubrication effect.
[0036] In an optional embodiment, an oil baffle 9 is installed on the side of the gearbox partition 1 facing the column shaft 3.
[0037] In this embodiment, for gearboxes where bearing lubricating oil and gearbox oil cannot be shared, this is generally because the oil in the gearbox contains relatively more impurities. In the design to reduce the oil filtration burden, the oil in the gearbox and the bearing oil are filtered separately. The oil baffle 9 can prevent or reduce the entry of bearing oil into the gearbox.
[0038] In an optional embodiment, one end of the oil baffle 9 is sealed to the outer ring of the high-speed bearing 2 by a sealing ring 10.
[0039] In this embodiment, the oil baffle 9 is fixed to the inner partition 1 of the gearbox by screws. The oil baffle 9 and the outer ring of the high-speed bearing 2 can jointly squeeze the sealing ring 10 to achieve the sealing effect. The collection shell 11 can be fixed by the same method as the oil baffle 9.
[0040] In an optional embodiment, the lowest point of the outer baffle of the oil baffle 9 is higher than the lowest point of the inner diameter of the outer ring of the high-speed bearing 2.
[0041] In this embodiment, when the lowest point of the outer baffle of the oil baffle 9 is higher than the lowest point of the inner diameter of the outer ring of the high-speed bearing 2, the oil inside the oil baffle 9 will flow into the outer ring of the high-speed bearing 2, and will not overflow from the oil baffle 9 into the gearbox. The lowest point of the outer baffle of the oil baffle 9 is the lowest point of the arc-shaped notch at the top of the outer baffle.
[0042] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A fuel injection plate device for a gearbox of an onshore wind turbine, comprising a high-speed bearing (2) and a fuel injection plate assembly (5) installed on a partition (1) inside the gearbox, wherein the fuel injection plate assembly (5) has an oil inlet (7) and an oil injection hole (8) connected through an inner groove, and an oil outlet (4) penetrating the outer ring of the high-speed bearing (2), characterized in that: The rear sealing plate (6) of the paint spray assembly (5) is a non-fully enclosed structure.
2. The fuel injection plate device for the gearbox of an onshore wind turbine as described in claim 1, characterized in that: The lower side of the rear sealing plate (6) is through-mounted.
3. The fuel injection plate device for the gearbox of an onshore wind turbine as described in claim 1, characterized in that: A semi-circular through-hole structure is provided on the lower side of the rear sealing plate (6).
4. The fuel injection plate device for the gearbox of an onshore wind turbine as described in claim 1, characterized in that: There are two oil spray holes (8), one of which sprays oil onto the rollers of the high-speed bearing (2), and the other sprays oil onto the baffle of the high-speed bearing (2).
5. The fuel injection plate device for the gearbox of an onshore wind turbine according to claim 1, characterized in that: An oil baffle (9) is installed on the side of the internal partition (1) of the gearbox facing the shaft (3).
6. The fuel injection plate device for the gearbox of an onshore wind turbine according to claim 1, characterized in that: One end of the oil baffle (9) is sealed to the outer ring of the high-speed bearing (2) by a sealing ring (10).
7. The fuel injection plate device for the gearbox of an onshore wind turbine according to claim 5, characterized in that: The lowest point of the outer baffle of the oil baffle (9) is higher than the lowest point of the inner diameter of the outer ring of the high-speed bearing (2).