Self-lubricating device for variable pitch bearing of wind turbine generator

Abstract

The utility model discloses a self-lubricating device for a variable-pitch bearing of a wind turbine generator, and relates to the technical field of wind turbine generators, the self-lubricating device comprises a shunting lubricating mechanism, the shunting lubricating mechanism comprises a lubricating ring cover, the lubricating ring cover is arranged on one side between an inner ring and an outer ring of the variable-pitch bearing, and an oil pump conveys lubricating oil to the lubricating ring cover through an oil conveying pipeline. Therefore, the problem of lubrication of the variable-pitch bearing of the wind turbine generator is solved, an outer side oil injection mode is adopted, oil injection through a hole groove is not needed, the hole groove does not need to be formed in the ring face of the variable-pitch bearing, the overall structural strength of the variable-pitch bearing cannot be damaged, meanwhile, lubricating oil can be provided for the variable-pitch bearing without shutdown of the wind turbine generator, and the service life of the variable-pitch bearing is prolonged. The normal operation of the variable pitch bearing can be ensured, the operation efficiency of the wind turbine generator is improved, and the maintenance cost and the maintenance operation difficulty are reduced.

Description

Technical Field

[0001] The present application relates to the technical field of wind turbines, and in particular to a self-lubricating device for a variable pitch bearing of a wind turbine. Background Art

[0002] The variable pitch bearing, also known as the blade bearing, is one of the core components in a wind turbine. It is installed between the blades and the hub of the wind turbine. Its main function is to connect the rotor hub and the rotor blades, and at the same time control the windward angle of the blades, thereby adjusting the speed of the wind rotor and the output power of the wind turbine. The variable pitch bearing has two structural forms: internal tooth type and external tooth type, and the rollers are single-row and double-row. The inner ring of the bearing is connected to the blade by bolts, and the outer ring is connected to the hub by bolts. When working, the variable pitch drive motor drives the inner ring of the variable pitch bearing to rotate, so that the blade rotates to change the pitch angle of the blade, thereby controlling the torque and power acting on the blade. In addition, since the torque required for the wind turbine to start is large, a certain starting torque can be obtained by adjusting the blade angle through the variable pitch bearing. During the operation of the wind turbine, the force condition of the variable pitch bearing is quite complex, and the impact load and vibration it is subjected to are large. Therefore, the clearance of the variable pitch bearing is required to be zero or negative to reduce the micro-wear of the bearing.

[0003] In the process of wind power generation, the variable pitch bearing is an important component connecting the blades and the hub, and its operating state directly affects the performance and life of the wind turbine. During the rotation of the bearing, due to the high speed and strong friction, it is necessary to apply lubricating oil to reduce its friction and maintain the normal operation of the bearing. However, when the existing lubrication system is filling the variable pitch bearing with oil, it is necessary to open a plurality of sets of holes and grooves on the annular surface of the variable pitch bearing, connect the holes and grooves to the pipeline, and use an oil pump to press the lubricating oil into the variable pitch bearing. The holes and grooves opened will destroy the structural integrity of the variable pitch bearing, reduce the overall structural strength of the variable pitch bearing, and are not conducive to the long-term stable operation of the variable pitch bearing. In addition, when lubricating, the wind turbine needs to be shut down, and the continuous rotation of the variable pitch bearing needs to be maintained so that the lubricating oil can be completely applied to the variable pitch bearing, which affects the operating efficiency of the wind turbine. Therefore, it is of great significance to design a device that can provide lubricating oil to the variable pitch bearing without filling oil through the holes and grooves and without shutting down the wind turbine, which is of great significance to improving the operating efficiency of the wind turbine and reducing maintenance costs. Utility Model Content

[0004] In order to solve the above-mentioned problems, the wind turbine can be lubricated without stopping without destroying the structural integrity of the variable pitch bearing, thereby ensuring sufficient lubrication and the normal operation of the variable pitch bearing. Therefore, the present application provides a self-lubricating device for the variable pitch bearing of a wind turbine.

[0005] The present application provides a wind turbine variable pitch bearing self-lubricating device that adopts the following technical solution.

[0006] A wind turbine variable pitch bearing self-lubricating device comprises a variable pitch bearing and a diversion lubrication mechanism, wherein the diversion lubrication mechanism comprises a lubrication ring cover, wherein the lubrication ring cover is arranged on one side between an inner ring and an outer ring of the variable pitch bearing, and an oil pump delivers lubricating oil to the lubrication ring cover through an oil pipeline.

[0007] By adopting the above technical scheme, through the setting of the diversion lubrication mechanism, the lubrication ring cover is used to lubricate the inner ring and the outer ring of the variable pitch bearing with oil, and the outer side oiling method is adopted. There is no need to inject oil through the hole groove, and there is no need to open the hole groove on the ring surface of the variable pitch bearing, which will not damage the overall structural strength of the variable pitch bearing. At the same time, lubricating oil can be provided to the variable pitch bearing without shutting down the wind turbine, which can ensure the normal operation of the variable pitch bearing, improve the operating efficiency of the wind turbine, and reduce the maintenance cost and difficulty of maintenance operation.

[0008] Optionally, a plurality of buffer oil tanks are arranged at intervals inside the lubrication ring cover, and oil spray holes are opened on the surface of the buffer oil tanks. The diversion lubrication mechanism also includes a multi-way diverter, and the oil pipeline is connected to the input end of the multi-way diverter. The multiple output ends of the multi-way diverter are connected one-to-one with the plurality of buffer oil tanks through diversion oil pipes.

[0009] By adopting the above technical solution, the design of multiple buffer oil tanks arranged at intervals enables the lubricating oil to be evenly distributed to multiple key parts of the variable pitch bearing. The lubricating oil is distributed to multiple groups of flow pipes through a multi-pass diverter, enters the buffer oil tanks at different positions, and finally sprays out from the oil spray holes, ensuring the uniformity and efficiency of lubrication.

[0010] Optionally, a pipe joint connected to the diversion oil pipe is provided on the lubrication ring cover corresponding to the buffer oil tank, and the pipe joint is communicated with the interior of the buffer oil tank.

[0011] By adopting the above technical solution, the setting of the pipe joint facilitates the connection between the diversion oil pipe and the buffer oil tank, and the transportation and distribution of the lubricating oil.

[0012] Optionally, a right-angled edge is provided on one side edge of the outer ring surface of the lubrication ring cover close to the pitch bearing, and the right-angled edge is connected to the outer ring of the pitch bearing by bolts.

[0013] By adopting the above technical solution and setting the right-angle folded edge, it is convenient to install and fix the lubrication ring cover using fastening bolts, thereby ensuring the installation stability of the lubrication ring cover and facilitating the installation and removal of the lubrication ring cover.

[0014] Optionally, a first sealing gasket is provided between the right-angle folded edge and the outer ring of the pitch bearing.

[0015] By adopting the above technical solution and setting the first sealing gasket, the tiny gap between the lubrication ring cover and the outer ring of the pitch bearing can be filled, thereby preventing the lubricating oil from leaking in these gaps, ensuring the sealing of the connection between the right-angle fold and the outer ring of the pitch bearing, and ensuring the normal operation of the lubrication system.

[0016] Optionally, a second sealing gasket is provided on an edge of one side of the inner ring surface of the lubrication ring cover close to the pitch bearing.

[0017] By adopting the above technical solution, the second sealing gasket is provided to fill the tiny gap between the inner ring surface of the lubrication ring cover and the inner ring of the pitch bearing, thereby preventing the lubricating oil from leaking in these gaps, keeping the connection sealed, and improving the sealing effect.

[0018] Optionally, a sealing groove is provided on one side of the inner ring of the pitch bearing, and when the lubrication ring cover is installed, the second sealing gasket is inserted into the sealing groove.

[0019] By adopting the above technical solution, the sealing groove is provided to provide a precise positioning and fixing position for the inner ring surface edge of the lubrication ring cover, which facilitates the rotational connection between the lubrication ring cover and the inner ring of the pitch bearing.

[0020] Optionally, a filter is installed on the oil pipeline.

[0021] Optionally, a valve is installed on the oil pipeline.

[0022] In summary, this application at least includes the following beneficial effects:

[0023] 1. The present application sets a diversion lubrication mechanism and utilizes a lubrication ring cover to lubricate the inner ring and the outer ring of the variable pitch bearing. It adopts an outer side oiling method, which does not require oiling through holes and grooves, and does not require holes and grooves to be opened on the ring surface of the variable pitch bearing. It will not damage the overall structural strength of the variable pitch bearing. At the same time, it can provide lubricating oil to the variable pitch bearing without shutting down the wind turbine, which can ensure the normal operation of the variable pitch bearing, improve the operating efficiency of the wind turbine, and reduce maintenance costs and maintenance operation difficulties.

[0024] 2. This application avoids damaging the structural integrity of the variable pitch bearing by setting up a diversion lubrication mechanism instead of opening holes and grooves on the annular surface of the variable pitch bearing, thereby ensuring its overall structural strength and facilitating the long-term stable operation of the variable pitch bearing. The design of buffer oil tanks arranged at multiple intervals allows the lubricating oil to be evenly distributed to multiple key parts of the variable pitch bearing. The lubricating oil is distributed to multiple groups of diversion oil pipes through a multi-pass diverter, enters buffer oil tanks at different positions, and finally sprays out from the oil spray hole, ensuring the uniformity and efficiency of lubrication.

[0025] 3. The present application uses the right-angle fold to facilitate the installation and fixation of the lubrication ring cover with fastening bolts, ensuring the installation stability of the lubrication ring cover and facilitating the installation and removal of the lubrication ring cover. A first sealing gasket is provided between the right-angle fold and the outer ring of the pitch bearing. The first sealing gasket can fill the small gap between the lubrication ring cover and the outer ring of the pitch bearing to prevent lubricating oil from leaking in these gaps, ensure the sealing of the connection between the right-angle fold and the outer ring of the pitch bearing, and ensure the normal operation of the lubrication system.

[0026] 4. The second sealing gasket of the present application can be used to fill the tiny gap between the inner ring surface of the lubrication ring cover and the inner ring of the pitch bearing, thereby preventing the lubricating oil from leaking in these gaps, keeping the connection sealed, and improving the sealing effect. A sealing groove is provided on one side of the inner ring of the pitch bearing. When installing the lubrication ring cover, the second sealing gasket is inserted into the sealing groove. The sealing groove provides a precise positioning and fixing position for the edge of the inner ring surface of the lubrication ring cover, which facilitates the rotational connection between the lubrication ring cover and the inner ring of the pitch bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 The invention is a structural schematic diagram of a wind turbine variable pitch bearing self-lubricating device (including a variable pitch bearing).

[0029] Figure 2 The present invention is a structural schematic diagram of a wind turbine variable pitch bearing self-lubricating device from another perspective (including a variable pitch bearing).

[0030] Figure 3 It is a schematic diagram of the structure of the split-flow lubrication mechanism (including the variable pitch bearing).

[0031] Figure 4 It is a schematic diagram of the disassembled structure of part of the split-flow lubrication mechanism (including the pitch bearing).

[0032] Figure 5 It is a schematic diagram of the inner structure of the lubrication ring cover.

[0033] Explanation of the reference numerals in the accompanying drawings: 1. outer ring of pitch bearing; 2. inner ring of pitch bearing; 3. oil storage tank; 4. oil pump; 5. oil pipeline; 6. diversion lubrication mechanism; 601. lubrication ring cover; 602. buffer oil tank; 603. oil injection hole; 604. multi-way diverter; 605. diversion oil pipe; 606. pipe joint; 607. right-angle fold; 608. bolt; 609. first sealing gasket; 610. second sealing gasket; 611. sealing slot; 7. valve; 8. filter. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] The following is combined with Figures 1 to 5 This application is described in further detail.

[0036] An embodiment of the present application discloses a self-lubricating device for a variable pitch bearing of a wind turbine.

[0037] Reference Figures 1 to 4 The wind turbine pitch bearing comprises a pitch bearing outer ring 1 and a pitch bearing inner ring 2. The pitch bearing outer ring 1 is assembled on the outer side of the ring surface of the pitch bearing inner ring 2. A plurality of rolling elements are assembled at the connection between the pitch bearing outer ring 1 and the pitch bearing inner ring 2.

[0038] Reference Figures 1 to 5 A self-lubricating device for a variable pitch bearing of a wind turbine generator system includes an oil storage tank 3, an oil pump 4, an oil pipeline 5, and a diversion lubrication mechanism 6. The diversion lubrication mechanism 6 is arranged on the rear side of the variable pitch bearing. The oil pump 4 transports lubricating oil to the diversion lubrication mechanism 6 through the oil pipeline 5. The oil pipeline 5 is sequentially equipped with a valve 7 and a filter 8.

[0039] The flow-dividing lubricating mechanism 6 includes a lubricating ring cover 601, which is arranged on one side between the inner ring and the outer ring of the variable pitch bearing, and the oil pump 4 delivers lubricating oil to the lubricating ring cover 601 through the oil delivery pipeline 5. Eight buffer oil tanks 602 are arranged at intervals in the lubricating ring cover 601, and other numbers can also be arranged, which can be adjusted according to actual needs. The surface of the buffer oil tank 602 facing the variable pitch bearing is provided with an oil injection hole 603. The flow-dividing lubricating mechanism 6 also includes a multi-pass diverter 604, and the number of output ends of the multi-pass diverter 604 corresponds to the number of buffer oil tanks 602. The oil delivery pipeline 5 is connected to the input end of the multi-pass diverter 604, and the eight output ends of the multi-pass diverter 604 are connected to the eight buffer oil tanks 602 one by one through the diverter oil pipe 605. By setting up the diversion lubrication mechanism 6, the lubrication ring cover 601 is used to lubricate the inner ring and the outer ring of the variable pitch bearing. The outer side oiling method is adopted, and there is no need to inject oil through the hole groove, and there is no need to open a hole groove on the ring surface of the variable pitch bearing. The overall structural strength of the variable pitch bearing will not be damaged. At the same time, the variable pitch bearing can be provided with lubricating oil without shutting down the wind turbine, which can ensure the normal operation of the variable pitch bearing, improve the operating efficiency of the wind turbine, and reduce the maintenance cost and difficulty of maintenance operation. The design of the buffer oil tank 602 arranged at multiple intervals allows the lubricating oil to be evenly distributed to multiple key parts of the variable pitch bearing. The lubricating oil is distributed to the multi-component diverter oil pipe 605 through the multi-pass diverter 604, enters the buffer oil tank 602 at different positions, and finally sprays out from the oil spray hole 603, ensuring the uniformity and efficiency of lubrication. A pipe joint 606 connected to the diverter oil pipe 605 is arranged on the outside of the lubrication ring cover 601 corresponding to the buffer oil tank 602, and the pipe joint 606 is connected to the inside of the buffer oil tank 602. The setting of the pipe joint 606 facilitates the connection between the diverter oil pipe 605 and the buffer oil tank 602 and the delivery and distribution of the lubricating oil.

[0040] A right-angled fold 607 is provided on one side edge of the outer ring surface of the lubricating ring cover 601 close to the pitch bearing, and the right-angled fold 607 is connected to the outer ring 1 of the pitch bearing through a plurality of bolts 608. The right-angled fold 607 is provided to facilitate the installation and fixing of the lubricating ring cover 601 using the fastening bolts 608, thereby ensuring the installation stability of the lubricating ring cover 601 and facilitating the installation and removal of the lubricating ring cover 601.

[0041] A first sealing gasket 609 is arranged between the right-angle folded edge 607 and the outer ring 1 of the pitch bearing. Through the setting of the first sealing gasket 609, the tiny gap between the lubrication ring cover 601 and the outer ring 1 of the pitch bearing can be filled to prevent the lubricating oil from leaking in these gaps, thereby ensuring the sealing of the connection between the right-angle folded edge 607 and the outer ring 1 of the pitch bearing, and ensuring the normal operation of the lubrication system.

[0042] A second sealing gasket 610 is provided on the edge of the inner ring surface of the lubricating ring cover 601 close to the pitch bearing. The second sealing gasket 610 is used to fill the small gap between the inner ring surface of the lubricating ring cover 601 and the inner ring 2 of the pitch bearing, thereby preventing the lubricating oil from leaking in these gaps, keeping the connection sealed, and improving the sealing effect. A sealing groove 611 is provided on one side of the inner ring 2 of the pitch bearing. When the lubricating ring cover 601 is installed, the second sealing gasket 610 is inserted into the sealing groove 611. The sealing groove 611 provides a precise positioning and fixing position for the edge of the inner ring surface of the lubricating ring cover 601, which facilitates the rotational connection between the lubricating ring cover 601 and the inner ring 2 of the pitch bearing.

[0043] How this application works:

[0044] When it is necessary to provide lubrication for the pitch bearing, the oil pump 4 is started. The oil pump 4 extracts lubricating oil from the oil storage tank 3 through the oil delivery pipeline 5 and delivers it to the diversion lubrication mechanism 6. Before the lubricating oil enters the diversion lubrication mechanism 6, it first passes through the filter 8. The impurities in the lubricating oil are removed by the filter 8 to ensure the cleanliness of the lubricating oil delivered to the bearing to avoid impurities from damaging the pitch bearing. The filtered lubricating oil enters the multi-pass diverter 604. The multi-pass diverter 604 distributes the lubricating oil to the multi-component diverter oil pipe 605 to ensure that each diverter oil pipe 605 can obtain an equal amount of lubricating oil. The lubricating oil is delivered to the pipe joint 606 on the outside of the lubricating ring cover 601 through the diverter oil pipe 605, and then enters the buffer oil tank 602 inside the lubricating ring cover 601. The buffer oil tank 602 can temporarily store the lubricating oil and evenly spray the lubricating oil into the pitch bearing through the oil spray hole 603 to lubricate the pitch bearing. The lubricating oil sprayed from the oil spray hole 603 forms an oil film in the bearing gap, reducing the friction and wear between the pitch bearing components, while taking away the heat generated by friction, ensuring the efficient and stable operation of the pitch bearing.

[0045] In the description of the present utility model, it should be understood that the terms "outside", "rear side", "one side", "inside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In the description of the present utility model, unless otherwise specified and limited, it should be noted that the term "connection" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal connection of two elements, it can be a direct connection, or it can be an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0046] The above are only preferred embodiments of the utility model and are not intended to limit the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A wind turbine variable pitch bearing self-lubricating device, comprising a variable pitch bearing, characterized in that: It also includes a flow-dividing lubrication mechanism, which includes a lubrication ring cover. The lubrication ring cover is arranged on one side between the inner ring and the outer ring of the pitch bearing, and the oil pump delivers lubricating oil to the lubrication ring cover through an oil pipeline.

2. A wind turbine variable pitch bearing self-lubricating device according to claim 1, characterized in that: A number of buffer oil tanks are arranged at intervals inside the lubrication ring cover, and oil spray holes are opened on the surface of the buffer oil tanks. The diversion lubrication mechanism also includes a multi-way diverter. The oil pipeline is connected to the input end of the multi-way diverter, and the multiple output ends of the multi-way diverter are connected to the buffer oil tanks one by one through the diversion oil pipe.

3. A wind turbine variable pitch bearing self-lubricating device according to claim 2, characterized in that: A pipe joint connected to the diversion oil pipe is arranged on the lubrication ring cover corresponding to the buffer oil bin, and the pipe joint is communicated with the inside of the buffer oil bin.

4. A wind turbine variable pitch bearing self-lubricating device according to claim 1, characterized in that: A right-angled fold is provided on one side edge of the outer ring surface of the lubricating ring cover close to the pitch bearing, and the right-angled fold is connected to the outer ring of the pitch bearing by bolts.

5. A wind turbine variable pitch bearing self-lubricating device according to claim 4, characterized in that: A first sealing gasket is arranged between the right-angle folded edge and the outer ring of the pitch bearing.

6. A wind turbine variable pitch bearing self-lubricating device according to claim 1, characterized in that: A second sealing gasket is arranged on an edge of one side of the inner ring surface of the lubricating ring cover close to the pitch bearing.

7. A wind turbine variable pitch bearing self-lubricating device according to claim 6, characterized in that: A sealing groove is provided on one side of the inner ring of the pitch bearing, and when the lubrication ring cover is installed, the second sealing gasket is inserted into the sealing groove.

8. A wind turbine variable pitch bearing self-lubricating device according to claim 1, characterized in that: A filter is installed on the oil pipeline.

9. A wind turbine variable pitch bearing self-lubricating device according to claim 1, characterized in that: A valve is installed on the oil pipeline.

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