Online cleaning process for generator bearing

Abstract

The invention belongs to the technical field of generators, and discloses a generator bearing online cleaning process which comprises the following steps: S1, heating a bearing; s2, a cleaning agent is injected into an oil injection port of the generator; s3, cleaning the bearing; s4, waste is extracted from an oil outlet of the generator; s5, injection of the cleaning agent is stopped, lubricating grease is injected into an oil injection port of the generator, the cleaning agent compatible with the lubricating grease is injected into the bearing chamber, the bearing is cleaned, the cleaning agent and waste grease are discharged after cleaning is completed, furthermore, the lubricating grease is injected after the bearing chamber is dried, the procedure is simple, the cleaning effect is good, and the service life of the generator is prolonged. The service life of the generator is greatly prolonged, the bearing can be cleaned without disassembling the generator, the generator cannot be damaged, and meanwhile, the cleaning and maintenance cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of generators, and in particular to an online cleaning process for generator bearings. Background Art

[0002] Wind turbines in the wind power industry include doubly-fed wind turbine generators and direct-drive wind turbine generators. All of the above generators have been in operation for more than three years, and the bearings inside the generators have been damaged due to lubrication problems. The bearing damage then causes the unit to vibrate, ultimately leading to generator damage.

[0003] At present, the maintenance of generator bearings in the industry is to disassemble the generator. The disassembly steps are: remove the coupling at the driving end of the generator, remove the collector ring and accessories at the rear of the generator, and remove the front and rear end covers of the generator. After disassembly is completed, manually clean the waste grease inside the generator end cover and bearing, and restore the equipment after cleaning.

[0004] There are many problems with the manual disassembly and cleaning of bearings, such as complicated disassembly and assembly, high labor costs during the disassembly and assembly process, and removal of the generator bearing end cover causing the dynamic balance of the generator to be destroyed, which is a destructive maintenance. Summary of the invention

[0005] The object of the present invention is to provide an online cleaning process for generator bearings, which has excellent cleaning effect, low maintenance cost and avoids damage to the generator.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] An online cleaning process for a generator bearing comprises the following steps:

[0008] S1, heating bearing;

[0009] S2. Inject cleaning agent into the oil filling port of the generator;

[0010] S3, cleaning the bearing;

[0011] S4, extracting waste from the oil discharge port of the generator;

[0012] S5. Stop injecting the cleaning agent, and inject grease into the oil filling port of the generator.

[0013] Preferably, the generator comprises a bearing chamber, the bearing is arranged in the bearing chamber, and the oil filling port and the oil discharge port are both connected to the bearing chamber, and the bearing chamber is always in a negative pressure state during the cleaning process.

[0014] Preferably, in S1, a heater is provided on the outer side of the end cover of the generator, and the heater heats the bearing to a preset temperature.

[0015] Preferably, S2 comprises:

[0016] S2.1. Connecting a first oil storage member, wherein the outlet of the first oil storage member is connected to the oil filling port through a first row of pipes, and the first oil storage member is filled with the cleaning agent;

[0017] S2.2, connecting an air compressor, wherein the output end of the air compressor is connected to the inlet of the first oil storage member through a first inlet pipe;

[0018] S2.3, start the air compressor.

[0019] Preferably, S3 includes:

[0020] The generator is operated at a rotation speed less than a rated value for a first preset time.

[0021] Preferably, in S4, the oil discharge port of the generator is connected to a vacuum oil suction machine, which is started to extract the cleaning agent and waste grease.

[0022] Preferably, S4 further includes: when the waste extracted from the oil discharge port of the generator meets a first preset condition, confirming that the bearing has been cleaned.

[0023] Preferably, the S5 comprises:

[0024] S5.1, blocking the first row of pipes and the first inlet pipe;

[0025] S5.2, drying the bearing chamber of the generator;

[0026] S5.3, inject the lubricating grease into the oil filling port.

[0027] Preferably, S5.2 includes:

[0028] S5.2.1. A dryer is provided, wherein the dryer is connected to the output end of the air compressor and the oil filling port through a first branch pipe and a second branch pipe respectively;

[0029] S5.2.2, start the dryer and run it for a second preset time;

[0030] S5.2.3. Turn off the dryer.

[0031] Preferably, S5.3 includes:

[0032] S5.3.1. Block the first branch pipe and the second branch pipe;

[0033] S5.3.2, connecting a second oil storage member, wherein the outlet of the second oil storage member is connected to the oil filling port through a second row of pipes, and the second oil storage member is filled with the grease;

[0034] S5.3.3. Connect the output end of the air compressor and the inlet of the second oil storage member through a second inlet pipe.

[0035] Beneficial effects of the present invention:

[0036] The present invention provides an online cleaning process for generator bearings, comprising the following steps: S1, heating the bearings; S2, injecting a cleaning agent into an oil filling port of the generator; S3, cleaning the bearings; S4, extracting waste from an oil discharge port of the generator; S5, stopping the injection of the cleaning agent, injecting grease into the oil filling port of the generator, and cleaning the bearings by injecting a cleaning agent compatible with the grease into a bearing chamber, and discharging the cleaning agent and waste grease after cleaning. Furthermore, the grease is injected after the bearing chamber is dried. The process is simple, the cleaning effect is excellent, the service life of the generator is greatly improved, the bearings can be cleaned without disassembling the generator, and the generator will not be damaged, while the cleaning and maintenance costs are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of a device for an online cleaning process of a generator bearing provided by an embodiment of the present invention;

[0038] Figure 2 yes Figure 1 The structural diagram at A in the middle;

[0039] Figure 3 The present invention provides a flowchart of an online cleaning process for a generator bearing.

[0040] In the figure:

[0041] 10. Generator; 101. End cover; 11. Oil filling port; 12. Oil drain port; 1. Heater; 2. First oil storage component; 3. Air compressor; 4. Vacuum oil suction machine; 5. Dryer; 6. Second oil storage component. DETAILED DESCRIPTION

[0042] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0043] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0045] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0046] This embodiment provides an online cleaning process for generator bearings, which has excellent cleaning effect on the bearings, greatly improves the service life of the generator, and can clean the bearings without disassembling the generator, thereby preventing damage to the generator and reducing cleaning and maintenance costs.

[0047] Before that, please refer to Figure 1 An end cover 101 is provided at the end of the generator 10, and a bearing chamber is formed in the end cover 101. The bearing is arranged in the bearing chamber to protect the bearing. Furthermore, an oil filling port 11 and an oil discharge port 12 are both provided on the end cover and connected to the bearing chamber so that grease can be added to the bearing chamber separately to prevent the grease from overflowing to other components and causing damage to other components.

[0048] See also Figure 1-Figure 3 , an online cleaning process for generator bearings comprises the following steps:

[0049] S1, heating bearing;

[0050] S2, injecting cleaning agent into the oil filling port 11 of the generator 10;

[0051] S3, cleaning bearings;

[0052] S4, extracting waste from the oil discharge port 12 of the generator 10;

[0053] S5. Inject grease into the oil filling port 11 of the generator 10.

[0054] Before S1, it also includes:

[0055] S01, removing the end cover 101 of the generator 10;

[0056] S02, cleaning the inner side of the end cover 101;

[0057] S03. Reinstall the end cover 101.

[0058] Specifically, first shut down the wind turbine and enter the maintenance or service mode, use the mechanical locking device to lock the wind turbine impeller, remove the generator 10 tachometer bracket, place the bracket on the platform on the right side of the cabin, remove the front cover and rear cover of the generator 10, move the front cover and rear cover by about 60cm, use a flat shovel to clean the grease on the inside of the front cover and the inside of the rear cover, and prevent scratches on the paint surface of the main shaft, and reinstall the front cover and rear cover.

[0059] S1 specifically includes:

[0060] Heaters 1 are provided on the outside of the front cover and the rear cover of the generator 10. Preferably, the heater 1 is installed by magnetic adsorption for easy disassembly and assembly. Furthermore, the heater 1 heats the bearing to a preset temperature so that the grease has sufficient fluidity for subsequent cleaning. Optionally, the front cover and the rear cover of the generator 10 can also be heated by hot air, which can also heat the bearing to a preset temperature.

[0061] Optionally, the preset temperature is 80° C., which is lower than the national temperature standard for bearings (GB3215-82).

[0062] Furthermore, S2 includes:

[0063] S2.1. Connect the first oil storage member 2. The outlet of the first oil storage member 2 is connected to the oil filling port 11 through the first row of pipes. The first oil storage member 2 is filled with cleaning agent.

[0064] S2.2, connecting the air compressor 3, the output end of the air compressor 3 is connected to the inlet of the first oil storage member 2 through the first inlet pipe;

[0065] S2.3. Start the air compressor 3.

[0066] Specifically, a first oil storage component 2 and an air compressor 3 are installed, and the first oil storage component 2 is filled with a cleaning agent, wherein the output end of the air compressor 3 is connected to the inlet of the first oil storage component 2 through a first inlet pipe, and the outlet of the first oil storage component 2 is connected to the oil filling port 11 of the generator 10 through a first row of pipes. It should be noted that the oil filling port 11 is connected to the bearing chamber, and the air compressor 3 is started to drive the cleaning agent into the bearing chamber to clean the bearing.

[0067] Specifically, the grease is Mobil SHC 460WT, and Mobil SHC 007 is used as the cleaning agent. It has excellent fluidity and can effectively remove the coked and hardened grease in the bearing. At the same time, Mobil SHC 460WT is compatible with Mobil SHC 007, and Mobil SHC 007 can provide good lubrication protection for the bearing alone.

[0068] Further, in S3, the mechanical locking device of the fan impeller is released, the generator 10 is operated, the speed of the generator 10 is controlled at the rated speed according to the on-site wind speed, and the generator 10 is operated for a first preset time, so that the cleaning agent can fully clean the bearing and remove the waste grease on the bearing. Optionally, the first preset time is 11 hours.

[0069] S4 is specifically as follows: connect the vacuum oil suction machine 4 to the oil discharge port 12 of the generator 10, start the vacuum oil suction machine 4, extract the cleaning agent and waste grease in the bearing chamber, and stop the operation of the vacuum oil suction machine 4 after the cleaning is completed. It should be noted that the cleaning agent is bright red in color and has good fluidity, while the waste grease is darker and darker in color and has signs of hardening. Therefore, when the waste extracted from the oil discharge port of the generator 10 meets the first preset condition, it is confirmed that the bearing has been cleaned. The first preset condition is that the liquid discharged by the vacuum oil suction machine 4 is bright red and free of impurities, and the bearing has been completely cleaned at this time.

[0070] For example, in order to prevent the cleaning agent in the bearing chamber from overflowing into other components of the generator 10 , during the cleaning process, the bearing chamber is always in a negative pressure state, that is, the operating efficiency of the vacuum oil suction machine 4 is greater than that of the air compressor 3 .

[0071] Furthermore, S5 includes:

[0072] S5.1. Block the first row of pipes and the first inlet pipe;

[0073] S5.2, drying the bearing chamber of the generator 10;

[0074] S5.3. Inject grease into the oil filling port 11.

[0075] S5.2 includes:

[0076] S5.2.1. A dryer 5 is provided, and the dryer 5 is connected to the output end of the air compressor 3 and the oil filling port 11 respectively through a first branch pipe and a second branch pipe;

[0077] S5.2.2, start the dryer 5 and run it for a second preset time;

[0078] S5.2.3. Turn off dryer 5.

[0079] Specifically, a dryer 5 is provided between the air compressor 3 and the oil filling port 11. The dryer 5 is connected to the output end of the air compressor 3 through a first branch pipe and to the oil filling port 11 through a second branch pipe. The dryer 5 is started to dry the air pressed into the air compressor 3. Furthermore, the dried air enters the bearing chamber through the oil filling port 11 for drying. After drying for a second preset time, the dryer 5 is turned off. In this embodiment, the second preset time is determined according to the specifications of the generator 10 and is not specifically limited here.

[0080] Furthermore, S5.3 includes:

[0081] S5.3.1, block the first branch and the second branch;

[0082] S5.3.2, connect the second oil storage member 6, the outlet of the second oil storage member 6 is connected to the oil filling port 11 through the second row of pipes, and the second oil storage member 6 is filled with grease;

[0083] S5.3.3. Connect the output end of the air compressor 3 and the inlet of the second oil storage member 6 through a second inlet pipe.

[0084] Specifically, the second oil storage member 6 is filled with grease, the second inlet pipe connects the output end of the air compressor 3 and the inlet of the second oil storage member 6, the outlet of the second oil storage member 6 is connected to the oil filling port 11 through the second row of pipes, and the first branch pipe and the first branch pipe are blocked, the second row of pipes and the second inlet pipe are opened to inject grease into the bearing chamber.

[0085] S5 is as follows:

[0086] Block the first row of pipes and the first inlet pipe, stop injecting the cleaning agent, open the first branch pipe and the second branch pipe, and start the dryer 5 to dry the bearing chamber. After a certain period of time, close the dryer 5, block the first branch pipe and the second branch pipe, and open the second inlet pipe and the second row of pipes at the same time, and press the grease in the second oil storage part 6 into the bearing chamber.

[0087] The present embodiment provides an online cleaning process for generator bearings, which cleans the bearings by injecting a cleaning agent compatible with grease into the bearing chamber, extracting the cleaning agent and waste grease after cleaning, and further injecting grease after drying the bearing chamber. The process is simple and the cleaning effect is excellent, which greatly improves the service life of the generator 10. The bearings can be cleaned without disassembling the generator 10, which will not cause damage to the generator 10, and at the same time reduces the cleaning and maintenance costs.

[0088] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A generator bearing online cleaning process, characterized in that: The following steps are involved: S1, heating bearing; S2, injecting a cleaning agent into the oil filling port (11) of the generator (10); S3, cleaning the bearing; S4, extracting waste from the oil discharge port (12) of the generator (10); S5, stop injecting the cleaning agent, and inject grease into the oil filling port (11) of the generator (10).

2. The online cleaning process for generator bearings according to claim 1 is characterized in that: The generator (10) comprises a bearing chamber, the bearing is arranged in the bearing chamber, and the oil filling port and the oil discharge port are both connected to the bearing chamber, and the bearing chamber is always in a negative pressure state during the cleaning process.

3. The online cleaning process for generator bearings according to claim 1 is characterized in that: In S1, a heater (1) is arranged on the outer side of the end cover (101) of the generator (10), and the heater (1) heats the bearing to a preset temperature.

4. The online cleaning process for generator bearings according to claim 1 is characterized in that: The S2 includes: S2.

1. Connecting the first oil storage member (2), wherein the outlet of the first oil storage member (2) is connected to the oil filling port (11) via a first row of pipes, and the first oil storage member (2) is filled with the cleaning agent; S2.2, connecting an air compressor (3), wherein the output end of the air compressor (3) is connected to the inlet of the first oil storage member (2) via a first inlet pipe; S2.3, start the air compressor (3).

5. The online cleaning process for generator bearings according to claim 1 is characterized in that: The S3 includes: The generator (10) is operated, and the generator (10) is operated at a rotation speed less than a rated value for a first preset time.

6. The generator bearing online cleaning process according to claim 1, characterized in that: In S4, the oil discharge port (12) of the generator (10) is connected to a vacuum oil suction machine (4), and the vacuum oil suction machine (4) is started to extract the cleaning agent and waste grease.

7. The online cleaning process for generator bearings according to claim 1, characterized in that: The step S4 also includes: when the waste extracted from the oil discharge port (12) of the generator (10) meets a first preset condition, confirming that the bearing has been cleaned.

8. The online cleaning process for generator bearings according to claim 4 is characterized in that: The S5 includes: S5.1, blocking the first row of pipes and the first inlet pipe; S5.2, drying the bearing chamber of the generator (10); S5.3, injecting the lubricating grease into the oil filling port (11).

9. The generator bearing online cleaning process according to claim 8, characterized in that: The S5.2 includes: S5.2.

1. A dryer (5) is provided, wherein the dryer (5) is connected to the output end of the air compressor (3) and the oil filling port (11) respectively through a first branch pipe and a second branch pipe; S5.2.2, starting the dryer (5) and running it for a second preset time; S5.2.

3. Close the dryer (5).

10. The online cleaning process for generator bearings according to claim 9, characterized in that: The S5.3 includes: S5.3.

1. Block the first branch pipe and the second branch pipe; S5.3.2, connecting the second oil storage member (6), wherein the outlet of the second oil storage member (6) is connected to the oil filling port (11) via a second row of pipes, and the second oil storage member (6) is filled with the lubricating grease; S5.3.

3. Connect the output end of the air compressor (3) and the inlet of the second oil storage member (6) via a second inlet pipe.

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