Quantitative lubrication system for yaw sliding bearing of wind turbine

Abstract

This application provides a quantitative lubrication system for the yaw sliding bearing of a wind turbine generator set, addressing issues such as inadequate lubrication, grease waste, and increased maintenance costs in existing technologies. A nacelle is rotatably stacked on top of the yaw bearing gear ring fixed to the tower, with a gasket located between them and rotating synchronously with the nacelle. The nacelle has an inner cavity in which a quantitative oil dispensing device is installed. The gasket has a central hole, allowing the oil from the quantitative oil dispensing device to reach the upper surface of the yaw bearing gear ring. The inlet of the lubrication point connector is connected to the oil inlet pipe, and the outlet is connected to the inlet of the quantitative oil dispensing device. The quantitative oil dispensing device includes a valve body with an oil inlet passage and multiple oil outlets in fluid communication with the oil inlet passage. The multiple oil outlets are arranged along the same axis, with the orifice diameter increasing sequentially from the side closer to the oil inlet passage to the side farther away, to quantitatively and evenly distribute the grease across the entire friction surface between the gasket and the yaw bearing gear ring during yaw.

Description

Technical Field

[0001] This application relates to the field of mechanical manufacturing, specifically to a quantitative lubrication system for the yaw sliding bearing of a wind turbine generator set. Background Technology

[0002] Currently, the yaw bearings of wind turbine generators have generally been changed from rolling bearings to sliding bearings, which has significantly reduced costs. However, this has led to a sharp increase in problems. Yaw sliding bearings generally still use the lubrication technology (devices) used in the original rolling bearings, that is, the yaw bearings use a single-point lubrication method. The original rolling bearings can achieve effective lubrication with this lubrication method due to their structural advantages (rotation). However, when sliding bearings continue to use the single-point lubrication method, because there are no balls, closed raceways, etc., the grease cannot cover the entire sliding bearing liner, and effective lubrication cannot be achieved.

[0003] The original lubrication method had the following problems:

[0004] The single oil outlet and small grease coverage area result in inadequate lubrication in some areas of the sliding bearing gasket, which leads to accelerated wear of the sliding bearing and risks such as vibration in the wind turbine generator set.

[0005] To solve the problem of insufficient lubrication, due to the structural issues of the lubrication device, the only solution was to increase the amount of grease injected. However, this was ineffective and instead caused a large amount of grease to be squeezed out, contaminating the engine compartment. Furthermore, the grease was extremely difficult to clean, increasing the difficulty of maintenance. At the same time, because most of the grease was wasted, the procurement cost of grease increased dramatically (lubricating grease is very expensive).

[0006] Due to the increased use of grease, the lubrication pump needs to be refilled frequently, which increases maintenance costs.

[0007] Excessive use of grease can cause over-lubrication in certain areas of the sliding bearing, thus reducing its lubrication performance. Utility Model Content

[0008] This invention provides a quantitative lubrication system for the yaw sliding bearing of a wind turbine generator set, in order to solve the problems of inadequate lubrication, waste of grease, and increased operation and maintenance costs in the prior art.

[0009] The technical solution of this utility model is as follows:

[0010] This application provides a quantitative lubrication system for the yaw sliding bearing of a wind turbine generator set, including: a nacelle base, a yaw bearing gear ring, a gasket, a quantitative oil outlet device, an oil inlet pipeline, and a lubrication point connector;

[0011] The nacelle is rotatably stacked on top of the yaw bearing gear ring fixed to the tower, and the liner is located between the two and rotates synchronously with the nacelle.

[0012] The engine compartment has an inner cavity, and the metering oil dispensing device is installed inside the inner cavity;

[0013] The gasket has a through hole, and the opening area of ​​the through hole is not less than the opening area of ​​the inner cavity, so that the oil from the metering oil outlet device can directly reach the upper surface of the yaw bearing gear ring.

[0014] The inlet of the lubrication point connector is connected to the oil inlet pipeline, and the outlet is connected to the inlet of the metering oil outlet device;

[0015] The metering oil dispensing device includes a valve body, and the valve body is provided with:

[0016] An oil inlet passage connected to the lubrication point connector; and

[0017] Multiple oil outlets are in fluid communication with the oil inlet channel. The multiple oil outlets are arranged along the same axis and the diameter of the outlets increases sequentially from the side closer to the oil inlet channel to the side farther away from the oil inlet channel, so as to quantitatively and evenly distribute the grease on all friction surfaces between the gasket and the yaw bearing gear ring during yaw.

[0018] Preferably, the metering oil dispensing device is connected to the engine compartment seat via a connecting bracket, so that the metering oil dispensing device rotates synchronously with the engine compartment seat.

[0019] Preferably, the connecting bracket is fixed to the engine compartment seat and to the valve body by bolts.

[0020] Preferably, the oil inlet on the valve body is directly connected to the outlet of the lubrication point connector, forming a short oil circuit without intermediate pipelines.

[0021] Preferably, the number and aperture gradient of the plurality of oil outlets are determined by fluid analysis to ensure that the oil output per unit time of each oil outlet is equal.

[0022] Preferably, the valve body is an integral metal component, and the oil inlet and the plurality of oil outlets are integrally formed by machining.

[0023] The beneficial effects of this utility model are as follows:

[0024] Because of the metered oil dispensing device, the grease is evenly distributed along a straight line next to the sliding bearing liner (instead of being concentrated in a clump below the lubrication point joint). When the engine nacelle yaws, the liner will spread the grease evenly, thus achieving uniform grease coverage on the liner and completing precise lubrication. Due to the dual action of the metered oil dispensing device and the lubrication pump, the grease will be used evenly, and the grease will no longer be overused. Attached Figure Description

[0025] Figure 1A structural diagram illustrating the lubrication principle of the yaw sliding bearing in a current wind turbine generator set.

[0026] Figure 2 Before the gear ring rotates in the existing technology Figure 1 Enlarged view of point A;

[0027] Figure 3 After the gear ring rotates in the existing technology Figure 1 Enlarged view of point A;

[0028] Figure 4 This is a schematic diagram of the quantitative lubrication system for the yaw sliding bearing of a wind turbine generator set in an embodiment of this application. Figure 1 ;

[0029] Figure 5 This is a schematic diagram of the quantitative lubrication system for the yaw sliding bearing of a wind turbine generator set in an embodiment of this application. Figure 2 ;

[0030] Figure 6 for Figure 4 A schematic diagram of direction B;

[0031] Figure 7 This is a schematic diagram showing the distribution of grease on the yaw bearing gear ring before rotation in the prior art.

[0032] Figure 8 This is a schematic diagram showing the distribution of grease on the yaw bearing gear ring after rotation in the prior art.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1-Nacelle base; 2-Yaw bearing gear ring; 3-Bushing; 31-Central hole; 101-Inner cavity; 4-Quantitative oil dispensing device; 41-Valve body; 411-Oil inlet; 412-Oil outlet; 413-Oil inlet; 5-Connecting bracket; 6-Oil inlet pipeline; 7-Lubrication point connector; 8-Specific lubrication area. Detailed Implementation

[0035] according to Figure 1 As shown, in the existing yaw sliding bearing lubrication scheme of wind turbine generator sets, the oil inlet pipe 1 is connected to the lubrication point connector 2. A first oil passage 4 is provided on the nacelle base 3, and a second oil passage 6 is provided on the gasket 5. The first oil passage 4 and the second oil passage 6 are connected. The lubrication point connector 2 is connected to the first oil passage 4. The oil is transported through the oil inlet pipe 1, the lubrication point connector 2, the first oil passage 4, and the second oil passage 6 to the lubrication area A between the lower end face of the gasket 5 and the upper surface of the gear ring 7. Under continuous pressure, the oil will be squeezed out as shown in the figure. Figure 2The circular area shown is an ideal state; in reality, it is mostly irregular in shape and smaller in area. When relative rotation occurs between the engine bay 4 and the gear ring 7, the grease will be applied as... Figure 3 The strip-shaped area shown (ideal state) marks the end of lubrication for the sliding bearing. It is difficult for the grease to be evenly distributed across the entire friction surface between the liner 5 and the gear ring 7. This indicates that due to the single oil outlet point of this structure, the grease application area is not ideal, resulting in poor lubrication and easy wear.

[0036] To solve the above problems, refer to Figures 4-6 This application provides a quantitative lubrication system for a yaw sliding bearing of a wind turbine generator set, comprising: a nacelle base 1, a yaw bearing gear ring 2, a gasket 3, a quantitative oil outlet device 4, an oil inlet pipe 6, and a lubrication point connector 7. The yaw bearing gear ring 2 is fixed to the tower. The nacelle base 1 has an inner cavity 101 formed on its lower surface facing the yaw bearing gear ring 2, and the quantitative oil outlet device 4 is embedded in this inner cavity 101. Furthermore, the gasket 3 has a central hole 301, the opening area of ​​which is larger than or the same as the opening area of ​​the inner cavity 101, allowing the oil from the quantitative oil outlet device 4 to directly reach a specific lubrication area 8 on the upper surface of the yaw bearing gear ring 2. The inlet of the lubrication point connector 7 is connected to the oil inlet pipe 6, and the outlet is connected to the inlet of the quantitative oil outlet device 4.

[0037] Reference Figure 5 In this embodiment of the application, the quantitative oil dispensing device 4 is connected to the engine compartment seat 1 via the connecting bracket 5; wherein, the quantitative oil dispensing device 4 and the connecting bracket 5 are fixed by bolts, and the engine compartment seat 1 and the connecting bracket 5 are also fixed by bolts, thereby enabling the quantitative oil dispensing device 4 to rotate synchronously with the engine compartment seat 1.

[0038] Reference Figure 5 and Figure 6 In this embodiment, the quantitative oil dispensing device 4 includes a valve body 41, on which an oil inlet channel 411 is provided, and the oil inlet 413 of the oil inlet channel 411 is connected to the outlet of the lubrication point connector 7. The valve body 41 is also provided with a plurality of oil outlets 412 communicating with the oil inlet channel 411. The plurality of oil outlets 412 are coaxially arranged, wherein the diameter of the oil outlets 412 gradually increases from the inlet side near the oil inlet channel 411 to the outlet side away from the oil inlet channel 411.

[0039] In this embodiment, the valve body 41 is an integral metal component, and the oil inlet 411 and the plurality of oil outlets 412 are integrally formed by machining.

[0040] Furthermore, in this embodiment, the number and aperture gradient of the multiple oil outlets 412 are determined by fluid analysis to ensure that the oil output per unit time of each oil outlet 412 is equal.

[0041] The oil inlet 413 on the valve body 41 is directly connected to the outlet of the lubrication point connector 7, forming a short oil circuit without intermediate pipelines.

[0042] When the grease is introduced, the grease enters the oil inlet channel 411 through the oil inlet pipe 6, the lubrication point connector 7 and the oil inlet port 413, and then reaches the upper surface of the yaw bearing gear ring 2 through multiple oil outlets 412 with different diameters.

[0043] Because multiple oil outlets 412 are arranged coaxially and linearly, the oil outlet positions are fixed (precise). Furthermore, due to fluid analysis, the orifice sizes of the oil outlets 412 of the quantitative oil dispensing device 4 exhibit a distribution of smaller diameters near the outlet and larger diameters farther away, resulting in a consistent oil volume at each outlet 412. Figure 7 The uniform distribution shown; as Figure 8 As shown, when the wind turbine yaws, the yaw bearing gear ring 2 rotates (clockwise or counterclockwise), which spreads the grease in a straight line evenly, thus achieving full grease coverage under the gasket 3. Furthermore, due to the precise oil outlet position and uniform oil output, a fixed grease requirement can be calculated, preventing the grease output from increasing due to unlubricated areas and causing grease overflow and waste. Therefore, the precise quantitative oil outlet device 4 in this embodiment can achieve effective lubrication (full coverage) and is more efficient and economical (stable grease output).

[0044] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A quantitative lubrication system for a yaw sliding bearing of a wind turbine generator set, characterized in that, include: The engine compartment (1), yaw bearing gear ring (2), gasket (3), metering oil outlet device (4), oil inlet pipeline (6), and lubrication point connector (7); The nacelle (1) is rotatably stacked on top of the yaw bearing gear ring (2) fixed on the tower, and the pad (3) is located between the two and rotates synchronously with the nacelle (1). The engine compartment (1) is provided with an inner cavity (101), and the metering oil dispensing device (4) is installed in the inner cavity (101); The gasket (3) has a through hole (301), the opening area of ​​the hole (301) is not less than the opening area of ​​the inner cavity (101), so that the oil from the metering oil outlet device (4) can directly reach the upper surface of the yaw bearing gear ring (2). The inlet of the lubrication point connector (7) is connected to the oil inlet pipe (6), and the outlet is connected to the inlet of the metering oil outlet device (4). The quantitative oil dispensing device (4) includes a valve body (41), and the valve body (41) is provided with: An oil inlet passage (411) connected to the lubrication point connector (7); and Multiple oil outlets (412) are in fluid communication with the oil inlet channel (411). The multiple oil outlets (412) are arranged along the same axis and the diameter of the outlets increases sequentially from the side closer to the oil inlet channel (411) to the side farther away from the oil inlet channel (411) so as to quantitatively and evenly distribute the grease on all friction surfaces between the gasket (3) and the yaw bearing gear ring (2) during yaw.

2. The quantitative lubrication system according to claim 1, characterized in that, The quantitative oil dispensing device (4) is connected to the engine compartment seat (1) via a connecting bracket (5), so that the quantitative oil dispensing device (4) and the engine compartment seat (1) rotate synchronously.

3. The quantitative lubrication system according to claim 2, characterized in that, The connecting bracket (5) is fixed to the engine compartment seat (1) and to the valve body (41) by bolts.

4. The quantitative lubrication system according to any one of claims 1-3, characterized in that, The oil inlet (413) on the valve body (41) is directly connected to the outlet of the lubrication point connector (7), forming a short oil circuit without intermediate pipelines.

5. The quantitative lubrication system according to claim 1, characterized in that, The number and aperture gradient of the plurality of oil outlets (412) are determined by fluid analysis to ensure that the oil output per unit time of each oil outlet (412) is equal.

6. The quantitative lubrication system according to claim 1, characterized in that, The valve body (41) is an integral metal component, and the oil inlet (411) and the plurality of oil outlets (412) are integrally formed by machining.

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