CN113623151A - Maintenance method for sealing leakage point of main bearing of wind driven generator - Google Patents

Maintenance method for sealing leakage point of main bearing of wind driven generator Download PDF

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Publication number
CN113623151A
CN113623151A CN202110882350.5A CN202110882350A CN113623151A CN 113623151 A CN113623151 A CN 113623151A CN 202110882350 A CN202110882350 A CN 202110882350A CN 113623151 A CN113623151 A CN 113623151A
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China
Prior art keywords
main bearing
bearing
seal
main
grease
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CN202110882350.5A
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CN113623151B (en
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张雷
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Shanghai Electric Wind Power Group Co Ltd
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Shanghai Electric Wind Power Group Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
    • F03D80/50—Maintenance or repair
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D17/00—Monitoring or testing of wind motors, e.g. diagnostics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
    • F03D80/70—Bearing or lubricating arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Sealing Of Bearings (AREA)
  • Rolling Contact Bearings (AREA)
  • Wind Motors (AREA)

Abstract

The invention discloses a method for overhauling a sealing leakage point of a main bearing of a wind driven generator, which comprises the following steps: step S1, detecting whether the lubrication channel is unobstructed; if yes, executing step S2, otherwise executing step S4; step S2, detecting the leakage position of the main bearing grease on the sealing element; step S3, detecting the leakage reason of the main bearing grease according to the leakage position of the main bearing grease on the sealing element; step S4 is to process the sealing mechanism based on the detection result. According to the invention, the reason for causing the leakage of the main bearing lubricating grease is searched according to the smoothness of the lubricating channel and the different leakage positions of the main bearing lubricating grease on the sealing element, and the places with problems of the sealing mechanism are treated in a targeted manner according to the specific leakage reason, so that the main bearing lubricating grease can be prevented from continuously leaking, the lubricating effect of the bearing is improved, and the service life of the bearing is prolonged.

Description

Maintenance method for sealing leakage point of main bearing of wind driven generator
Technical Field
The invention relates to the field of maintenance of bearings of wind driven generators, in particular to a maintenance method of a sealing leakage point of a main bearing of a wind driven generator.
Background
The main bearing of the wind driven generator is used as an important part for bearing a driving chain and carrying out rotating speed transmission, and the service life of the main bearing directly influences the stable operation of the wind driven generator. Particularly, for an offshore wind generating set, due to the fact that operation and maintenance costs are high, if a main bearing fails, large economic losses are brought. The main bearing sealing ring is used as an important part of a main bearing closed space, and the lubricating effect of the main bearing is directly influenced by the tightness of the sealing ring, so that the service life of the main bearing is influenced.
Because the main bearing sealing washer is direct and main shaft interference fit, consequently at the rotatory in-process of main shaft, inevitably can produce the friction to the main bearing sealing washer, can lead to the wearing and tearing of main bearing sealing washer after long-time, can cause the main bearing sealing washer to produce the oil leak phenomenon, the lubricating oil that is used for lubricated main bearing leaks to the main bearing outside from the butt of main bearing and main bearing sealing washer, reduces the lubricated effect of main bearing, and then reduces the life of main bearing. Simultaneously, because the main bearing sealing washer realizes that circumference tightens up through the sealing washer spring, aerogenerator's long-time operation also can lead to sealing washer spring circumference pretightning force not enough to the main bearing sealing washer oil leak phenomenon appears more easily.
In the prior art, a maintainer generally enhances the sealing effect of a main bearing by designing a special sealing mechanism to prevent the oil leakage phenomenon of a sealing ring of the main bearing. However, after the oil leakage phenomenon of the main bearing sealing ring occurs, no further measures can be taken to eliminate the oil leakage phenomenon, so that the oil leakage phenomenon of the main bearing sealing ring can exist all the time, the lubricating effect of the main bearing is reduced, and the service life of the main bearing is prolonged.
Disclosure of Invention
The invention aims to overcome the defects that lubricating grease leakage of a main bearing causes the reduction of the lubricating effect and the service life of the main bearing in the prior art, and provides a method for overhauling a sealing leakage point of the main bearing of a wind driven generator.
The invention solves the technical problems through the following technical scheme:
a maintenance method for a sealing leakage point of a main bearing of a wind driven generator, wherein the wind driven generator comprises a sealing mechanism for sealing lubricating grease of the main bearing, the sealing mechanism comprises a lubricating channel and sealing pieces, the lubricating channel is communicated with the lubricating point on the main bearing, the sealing pieces are arranged on two axial sides of the bearing, the sealing pieces are used for limiting the leakage of the lubricating grease of the main bearing in the main bearing, and the maintenance method for the sealing leakage point of the main bearing of the wind driven generator comprises the following steps:
step S1, detecting whether the lubricating channel is unobstructed; if yes, executing step S2, otherwise executing step S4;
step S2, detecting the leakage position of the main bearing grease on the sealing element;
step S3, detecting the leakage reason of the main bearing grease according to the leakage position of the main bearing grease on the sealing element;
and step S4, processing the sealing mechanism according to the detection result.
In this scheme, the main bearing lubricating grease plays lubricated bearing's effect, improves the life of main bearing. The sealing mechanism is used for preventing main bearing lubricating grease inside the main bearing from leaking, so that the main bearing lubricating grease can only enter and exit the bearing through the lubricating channel, and the lubricating effect of the bearing is improved. This scheme detects whether unobstructed to lubricated passageway earlier, if detect out lubricated passageway and be unobstructed, then handles lubricated passageway earlier, need not detect the sealing member, simplifies the detection procedure, improves detection efficiency. If it is unobstructed to detect out the lubrication channel, carry out follow-up detection step again, according to main bearing grease different leakage position on the sealing member search for the reason that leads to main bearing grease to leak, according to concrete leakage reason again, pointed handles the place that sealing mechanism goes wrong to can prevent that main bearing grease from continuing to leak, improve the lubricated effect and the life of main bearing.
Preferably, the lubricating channel comprises a grease inlet channel and a grease outlet channel, and the grease inlet channel and the grease outlet channel are respectively communicated with a grease inlet and a grease outlet of the main bearing;
in step S1, it is observed whether the main bearing grease can flow into the grease inlet passage and flow out of the grease outlet passage; if yes, the lubrication channel is unobstructed, otherwise, the lubrication channel is obstructed.
In this scheme, provide a method that whether detects lubricated passageway unobstructed, main bearing lubricating grease is lubricated the main bearing through advancing inside the main bearing that the fat passageway flowed into, and it is inside from going out the fat passageway outflow main bearing again after lubricated.
Preferably, in step S1, if the lubrication channel is not open, in step S4, the sealing mechanism is treated to unblock the lubrication channel.
In this scheme, if lubricated passageway is not unobstructed, it can lead to lubricated passageway internal pressure too big to continuously carry main bearing lubricating grease to main bearing inside to lead to main bearing lubricating grease to leak, consequently need dredge lubricated passageway.
Preferably, in step S2, the location of leakage of main bearing grease on the seal is detected by rotating the rotor of the wind turbine.
In this scheme, can more accurately find out the leakage position of main bearing lubricating grease on the sealing member through rotatory aerogenerator's wind wheel.
Preferably, step S2 includes the following steps:
step S21, idling a wind wheel of the wind driven generator, and detecting whether a leakage position of main bearing lubricating grease on the sealing element can be found; if yes, go to step S3, otherwise go to step S22;
step S22, arranging a recorder on the outer side of the main bearing, and aligning the recorder with the seal;
and step S23, electrifying the wind driven generator, rotating the wind wheel of the wind driven generator, and recording the leakage position of the main bearing lubricating grease on the sealing element through the recorder.
In this scheme, whether idle running aerogenerator's wind wheel observation can find out the leakage position of main bearing lubricating grease on the sealing member earlier, if can find out the leakage position of main bearing lubricating grease on the sealing member, then can continue to look for the leakage reason, improve maintenance efficiency. If the wind wheel of the idling wind driven generator cannot find the leakage position of the main bearing grease on the sealing element, the wind driven generator needs to be in a long-time power generation state, and the leakage position of the main bearing grease on the sealing element is recorded by a recorder.
Preferably, the wind driven generator further comprises an information transmission system, the recorder is electrically connected with the information transmission system, and the information transmission system is used for transmitting the content recorded by the recorder to the wind driven generator monitoring platform.
In this scheme, above-mentioned setting is favorable to the maintainer to observe the leakage position of base bearing lubricating grease on the sealing member in real time to can in time overhaul sealing mechanism, make base bearing lubricating grease stop leaking as early as possible, improve the lubricated effect and the life of base bearing.
Preferably, the wind turbine further comprises a seal pressing plate disposed axially outside the seal and abutting against the seal, the seal pressing plate for restricting movement of the seal in an axial direction of the main bearing;
step S11 is also included before step S2: and removing the sealing element pressing plate.
In this scheme, because the setting of sealing member clamp plate is in the axial outside of sealing member, above-mentioned setting is used for preventing that the sealing member clamp plate from to the sheltering from of maintainer sight or record appearance camera lens, the convenient observation to the sealing member.
Preferably, the wind driven generator further comprises a main shaft, and the main bearing is sleeved on the main shaft;
step S10 is also included before step S2: and cleaning residual main bearing lubricating grease on the main shaft, the main bearing and the sealing mechanism.
In this scheme, above-mentioned setting is used for conveniently recognizing the leakage position of main bearing grease on the sealing member, prevents to remain the judgement error that main bearing grease caused.
Preferably, the wind driven generator further comprises a main shaft, a bearing seat, a bearing end cover and a bearing baffle ring, the main bearing is sleeved on the main shaft, the bearing end cover is provided with a containing groove for containing the sealing element, the bearing baffle ring is sleeved on the radial outer side surface of the main shaft, and the bearing baffle ring and the main shaft rotate synchronously;
along the radial direction of the main bearing, one end of the bearing end cover is connected with the bearing seat, the other end of the bearing end cover is abutted with the radial outer side face of the sealing element, and the radial inner side face of the sealing element is abutted with the main shaft or the bearing retaining ring.
In this scheme, the bearing backing ring is used for making things convenient for the axial positioning of main bearing on the main shaft to can restrict the main bearing and move in the axis direction. Through the cooperation of bearing end cover and sealing member for the axial both ends of main bearing are sealed, and main bearing lubricating grease can't flow out the main bearing.
Preferably, in step S2, if leakage of the main bearing grease on the radially outer side surface of the seal is detected, step S3 includes the steps of:
step S311, detecting whether the radial outer side surface of the sealing element is in interference fit with the bearing end cover by using a feeler gauge; if yes, go to step S312, otherwise go to step S4;
step S312, measuring the axial width and the outer diameter of the sealing element;
step S313, measuring the axial width of the accommodating groove and the diameter of the accommodating groove;
step S314, comparing the outer diameter and the axial width of the sealing element, the axial width of the accommodating groove and the diameter of the accommodating groove with corresponding dimensions in a design drawing, and finding out dimensions which do not meet the requirements of the design drawing.
In this aspect, if the main bearing grease leaks on the radially outer side surface of the seal, it is necessary to consider whether or not there is a problem with the engagement between the radially outer side surface of the seal and the bearing end cover. Whether interference fit between the sealing element and the bearing end cover is detected by the feeler gauge, if not, the sealing element can be directly replaced, subsequent measurement steps are not required, and the detection efficiency is improved. If the sealing element is in interference fit with the bearing end cover, whether the fitting size of the sealing element and the bearing end cover meets the design requirement is judged, so that the leakage reason of the main bearing lubricating grease is detected.
Preferably, in step S314, if one or more of the outer diameter and the axial width of the sealing member, and the axial width and the diameter of the accommodating groove do not satisfy the corresponding dimensional requirements in the design drawing, in step S4, the sealing mechanism is processed in such a manner that the axial width of the sealing member and/or the outer diameter of the sealing member are/is adjusted.
In this embodiment, if it is detected that the fitting size between the seal member and the bearing end cap does not satisfy the design requirement, it is necessary to ensure the fitting between the seal member and the bearing end cap by adjusting the corresponding size of the seal member, thereby preventing the main bearing grease from leaking on the radially outer side surface of the seal member.
Preferably, the accommodating groove comprises a contact surface abutted with the sealing element;
step S313 further includes measuring the roughness of the contact surface, and step S314 further includes comparing the roughness of the contact surface with a corresponding surface roughness in the design drawing.
In this scheme, the roughness of the contact surface that the bearing cap is used for with the sealing member butt also can influence the cooperation between bearing cap and the sealing member, and the roughness of contact surface is higher, and the cooperation effect is more poor.
Preferably, in step S314, if the roughness of the contact surface is greater than the corresponding surface roughness in the design drawing, in step S4, the sealing mechanism is processed by polishing the contact surface.
In this scheme, the roughness of contact surface can be reduced in the polishing to improve the cooperation effect of sealing member and bearing end cover.
Preferably, the accommodating groove has a first contact surface for abutting against a radially outer side surface of the sealing member;
in step S2, if leakage of the main bearing grease on the radially inner surface of the seal is detected, step S3 includes the steps of:
step S321, detecting whether the radial inner side surface of the sealing element is in interference fit with the main shaft or the bearing retaining ring by using a feeler gauge; if yes, go to step S322, otherwise go to step S4;
step S322, checking the damage condition of the radial inner side surface of the sealing element, and judging whether the sealing element can be continuously used; if yes, go to step S323, otherwise go to step S4;
step S323, measuring the radial width of the sealing element;
step S324, measuring a distance between the first contact surface and the main shaft in a radial direction of the main bearing, or measuring a distance between the first contact surface and the bearing retainer ring in the radial direction of the main bearing;
step 325, comparing the radial width of the sealing element and the distance between the first contact surface and the main shaft in the radial direction of the main bearing with corresponding dimensions in a design drawing, and finding out dimensions which do not meet the requirements of the design drawing; or comparing the radial width of the sealing element and the distance between the first contact surface and the bearing baffle ring in the radial direction of the main bearing with corresponding dimensions in a design drawing, and finding out the dimensions which do not meet the requirements of the design drawing.
In this embodiment, if the main bearing grease leaks from the radially inner surface of the seal, it is necessary to consider whether or not there is a problem with the fit between the seal and the main shaft or the bearing retainer ring. Whether the sealing element is in interference fit with the main shaft or the bearing retaining ring is detected by the feeler gauge, if not, the sealing element can be directly replaced, subsequent measurement steps are not required, and the detection efficiency is improved. And if the sealing element is in interference fit with the main shaft or the bearing retaining ring, detecting the leakage reason of the main bearing lubricating grease by judging whether the fit size of the sealing element and the main shaft or the bearing retaining ring meets the design requirement.
Preferably, in step S325, if one or more of the radial width of the seal and the distance between the first contact surface and the main shaft in the radial direction of the main bearing do not satisfy the corresponding dimension requirements in the design drawing; or, if one or more of the radial width of the seal and the distance between the first contact surface and the bearing retainer ring in the radial direction of the main bearing does not meet the corresponding dimension requirement in the design drawing;
then in step S4 the sealing mechanism is processed in such a way that the inner diameter of the seal is adjusted.
In this embodiment, if it is detected that the fitting dimension between the sealing member and the main shaft or the bearing retainer does not satisfy the design requirement, the fitting between the sealing member and the main shaft or the bearing retainer needs to be ensured by adjusting the corresponding dimension of the sealing member, so as to prevent the main bearing grease from leaking on the radially inner side surface of the sealing member.
Preferably, in step S325, if the dimension that does not meet the requirement of the design drawing cannot be found, step S3 further includes:
step S331, keeping the main shaft in a static state;
step S332, measuring gaps between the bearing end covers and the main shaft, wherein the bearing end covers are located at the topmost end and the bottommost end of the main bearing; or measuring the clearance between the bearing end cover and the bearing baffle ring at the topmost and bottommost positions of the main bearing;
and S333, comparing the size of the theoretical radial play of the clearance and the main bearing.
In this scheme, because the main bearing has theoretical radial play, can produce certain removal in the radial direction of main bearing to in aerogenerator's wind wheel rotation process, the radial medial surface of sealing member probably can not be constantly with main shaft or bearing fender ring complete butt, thereby leads to the radial medial surface of main bearing lubricating grease at the sealing member to leak. Under the influence of gravity, the change of the clearance between the bearing end cover positioned at the topmost end and the bottommost end of the main bearing and the main shaft is the largest, and if the clearance at the two positions can be less than or equal to the theoretical radial clearance of the main bearing, the clearance between the bearing end cover and the main shaft can be less than or equal to the theoretical radial clearance of the main bearing, so that the clearance at other positions can not be measured, and the measuring process is simplified.
Preferably, in step S333, if the clearance is larger than the theoretical radial play of the main bearing, in step S4, the seal mechanism is processed in such a way that the inner diameter of the seal is adjusted.
In this scheme, the internal diameter size through the adjustment sealing member makes the radial medial surface of sealing member can keep off the ring complete butt with main shaft or bearing all the time at aerogenerator's the rotatory in-process of wind wheel, prevents that main bearing lubricating grease from leaking.
Preferably, the wind turbine further comprises a seal pressing plate disposed axially outside the seal and abutting against the seal, the seal pressing plate for restricting movement of the seal in an axial direction of the main bearing;
in step S325, if the size that does not satisfy the requirement of the design drawing cannot be found, step S3 further includes:
step S341, mounting a circular runout instrument on the seal pressing plate, where the circular runout instrument is connected to the main shaft in a radial direction of the main bearing;
step S342, idling a wind wheel of the wind driven generator;
step S343, measuring the circular runout of the radial outer side surface of the main shaft; or measuring the circular runout quantity of the radial outer side surface of the bearing baffle ring;
and S344, comparing the circular runout quantity of the radial outer side surface of the main shaft or the circular runout quantity of the radial outer side surface of the bearing retaining ring with the corresponding circular runout quantity in a design drawing.
In this scheme, because there is manufacturing error in main shaft or bearing backing ring, the external diameter size that leads to main shaft and the different circumferential position of bearing backing ring to have the difference for the sealing member can't be in the complete butt joint of partial region with main shaft or bearing backing ring, thereby leads to main bearing grease to leak at the radial medial surface of sealing member.
Preferably, in step S344, if the circular runout amount of the radial outer side surface of the spindle satisfies a corresponding circular runout amount in a design drawing; or the circular runout quantity of the radial outer side surface of the bearing baffle ring meets the corresponding circular runout quantity in the design drawing;
then in step S4 the sealing mechanism is processed in such a way that the axial pretension of the seal is increased.
In this embodiment, if the amount of circular runout of the radial outer side surface of the main shaft or the bearing retainer ring meets the design requirement, the leakage of the main bearing grease is not related to the manufacturing error of the main shaft or the bearing retainer ring, and the axial preload of the sealing element may be increased because the main bearing grease is leaked due to insufficient axial preload of the sealing element.
Preferably, in step S344, if the circular runout amount of the radial outer side surface of the spindle does not satisfy the corresponding circular runout amount in the design drawing; or the circular runout quantity of the radial outer side surface of the bearing baffle ring does not meet the corresponding circular runout quantity in the design drawing;
then in step S4 the sealing mechanism is processed in such a way that the inner diameter of the seal is adjusted.
In this scheme, make each position of the radial medial surface of sealing member in circumference can both with main shaft or bearing retainer ring complete butt through the internal diameter size of adjustment sealing member, prevent that main bearing lubricating grease from leaking.
The positive progress effects of the invention are as follows: the method and the device firstly detect whether the lubrication channel is unobstructed, and if the lubrication channel is detected to be obstructed, the lubrication channel is firstly processed without detecting a sealing element, so that the detection steps are simplified, and the detection efficiency is improved. If it is unobstructed to detect out the lubrication channel, carry out follow-up detection step again, according to main bearing grease different leakage position on the sealing member search for the reason that leads to main bearing grease to leak, according to concrete leakage reason again, pointed handles the place that sealing mechanism goes wrong to can prevent that main bearing grease from continuing to leak, improve the lubricated effect and the life of main bearing.
Drawings
Fig. 1 is a schematic perspective view of a drive chain of a wind turbine according to an embodiment of the present invention.
Fig. 2 is a schematic cross-sectional view of a driving chain of a wind turbine according to an embodiment of the present invention.
Fig. 3 is an enlarged view of a portion a of fig. 2.
Fig. 4 is a schematic cross-sectional view of a sealing member according to an embodiment of the present invention.
Fig. 5 is a schematic cross-sectional structure diagram of a bearing end cover according to an embodiment of the invention.
Fig. 6 is a schematic cross-sectional structure view of a drive chain of a wind turbine generator with a recorder according to an embodiment of the present invention.
Fig. 7 is a schematic flow chart of a method for repairing a leakage point of a main bearing seal of a wind turbine according to an embodiment of the present invention.
Description of reference numerals:
main shaft 1
Main bearing 2
Bearing outer ring 21
Bearing inner race 22
Bearing block 3
Sealing element 4
Radial outer side 41 of the seal
Radially inner side 42 of the seal
Axially outer side 43 of the seal
Axially inner side 44 of the seal
Accommodating groove 45
Bearing end cap 5
Accommodation groove 6
First contact surface 61
Second contact surface 62
Sealing element pressure plate 7
Bearing retainer ring 8
Recorder 9
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
The present embodiments provide a wind turbine comprising a rotor, a nacelle and a drive train. As shown in fig. 1 to 3, the driving chain includes a main shaft 1, a main bearing 2 and a bearing seat 3, the main bearing 2 is sleeved on the main shaft 1, the main shaft 1 is coaxial with the main bearing 2, and the bearing seat 3 is fixed on the nacelle. The main shaft 1 is connected with the wind wheel and rotates synchronously along with the wind wheel. The main bearing 2 comprises a bearing outer ring 21 and a bearing inner ring 22, the bearing outer ring 21 keeps static relative to the bearing seat 3, and the bearing inner ring 22 is sleeved on the main shaft 1 and rotates synchronously along with the main shaft 1. The external wind power drives the wind wheel to rotate, further drives the main shaft 1 connected with the wind wheel to rotate, and drives the bearing inner ring 22 connected with the main shaft 1 to rotate, so that the wind energy is converted into mechanical energy.
In order to make the main bearing 2 rotate more smoothly and reduce the wear received during rotation, the main bearing 2 is lubricated by main bearing grease so as to prolong the service life of the main bearing 2. The wind driven generator further comprises a sealing mechanism for sealing the main bearing lubricating grease, and the sealing mechanism is used for preventing the main bearing lubricating grease inside the main bearing 2 from leaking so as to avoid reducing the lubricating effect of the main bearing 2 and avoiding the pollution of the leaked main bearing lubricating grease to other parts.
As shown in fig. 3-5, the sealing mechanism includes a lubrication channel (not shown), a seal 4, a bearing end cap 5, a seal retainer 7, and a bearing retainer 8. The sealing element 4, the bearing end cover 5, the sealing element pressure plate 7 and the bearing baffle ring 8 are all coaxial with the main bearing.
The lubrication channel is in communication with the lubrication points on the main bearing 2 for transporting main bearing grease. The lubricating channel comprises a grease inlet channel and a grease outlet channel, the grease inlet channel is communicated with a grease inlet of the main bearing 2, and the grease outlet channel is communicated with a grease outlet of the main bearing 2. The main bearing lubricating grease enters the main bearing 2 from the grease inlet through the grease inlet channel and lubricates the main bearing, and after lubrication is finished, the main bearing lubricating grease flows out of the main bearing 2 through the grease outlet and the grease outlet channel.
As shown in fig. 4, the sealing element 4 is an elastic annular structure, and the sealing element 4 is sleeved on the main shaft 1 and is arranged on two axial sides of the main bearing 2, so that the leakage of main bearing grease inside the main bearing 2 is limited, the main bearing grease can only enter and exit the main bearing 2 through a lubricating channel, and the lubricating effect of the main bearing 2 is improved.
As shown in fig. 5, the bearing cap 5 is an annular structure, the bearing cap 5 is sleeved on the main shaft 1, the bearing cap 5 has a receiving groove 6 for receiving the sealing element 4, and the receiving groove 6 extends from an axially outer side surface of the bearing cap 5 to an axially inner side of the bearing cap 5. Along the radial direction of main bearing 2, one end of bearing end cover 5 is fixed on bearing frame 3 to guarantee that the radial outside of main bearing 2 is sealed, and the other end of bearing end cover 5 extends to main shaft 1 and is close to the radial outside of main shaft 1. A certain clearance is provided between the bearing end cover 5 and the main shaft 1 to ensure that the bearing end cover 5 does not interfere with the rotation of the main shaft 1. The sealing element 4 is arranged between the main shaft 1 and the bearing end cover 5 and is accommodated in the accommodating groove 6, the accommodating groove 6 comprises a contact surface abutted to the sealing element 4, specifically, a first contact surface 61 abutted to the radial outer side surface 41 of the sealing element and a second contact surface 62 abutted to the axial inner side surface 44 of the sealing element are provided, the radial inner side surface 42 of the sealing element is abutted to the main shaft 1 or the bearing baffle ring 8, so that the axial two ends of the main bearing 2 are closed, and main bearing lubricating grease is prevented from flowing out of the main bearing 2 from a gap between the bearing outer ring 21 and the bearing inner ring 22.
The sealing element pressing plate 7 is of an annular plate-shaped structure, the sealing element pressing plate 7 is sleeved on the main shaft 1, one end of the sealing element pressing plate 7 is fixed on the bearing end cover 5 along the radial direction of the main shaft 2, the other end of the sealing element pressing plate 7 extends towards the main shaft 1, and a certain gap is formed between the sealing element pressing plate 7 and the main shaft 1 so as to ensure that the sealing element pressing plate 7 cannot interfere with the rotation of the main shaft 1. The seal pressing plate 7 is arranged on the axial outer side of the seal 4 and is abutted against the seal 4, specifically, the axial outer side surface 43 of the seal is abutted against the axial inner side surface of the seal pressing plate 7, the seal pressing plate 7 and the bearing end cover 5 are matched to limit the movement of the seal 4 in the axial direction of the main bearing 2, and the seal pressing plate 7 is mainly used for limiting the seal 4 to move towards the outer side of the main bearing 2.
The bearing baffle ring 8 is of an annular structure, and the bearing baffle ring 8 is sleeved on the radial outer side surface of the main shaft 1 and can synchronously rotate with the main shaft 1. The bearing baffle ring 8 is arranged on the axial outer side of the main bearing 2, and the bearing baffle ring 8 is matched with the main shaft 1 to facilitate the axial positioning of the main bearing 2 on the main shaft 1 and limit the movement of the main bearing 2 in the axial direction.
As shown in fig. 3, both axial ends of the main bearing 2 are provided with a sealing mechanism, each sealing mechanism comprises an independent sealing element 4, a bearing end cover 5 and a sealing element pressure plate 7, but the bearing retainer ring 8 is only arranged on the axial right side of the main bearing 2. Specifically, as shown in fig. 3, the main shaft 1 located on the left side in the axial direction of the main bearing 2 is stepped to restrict the movement of the main bearing 2 to the left side, and the radially inner surface 42 of the seal located on the left side of the main bearing 2 abuts against the radially outer surface of the main shaft 1. The bearing retainer ring 8 is provided on the axially right side of the main bearing 2 to restrict the main bearing 2 from moving to the right side thereof, and the radially inner surface 42 of the seal on the right side of the main bearing 2 abuts against the radially outer surface of the bearing retainer ring 8.
In other alternative embodiments, the wind turbine may not use the bearing retainer ring 8 to limit the movement of the main bearing 2 in the axial direction, but may use other axial limiting mechanisms, in which case, the sealing members 4 at both axial ends of the main bearing 2 may directly abut against the main shaft 1.
Note that, in the present embodiment, the axially outer side refers to a side away from the main bearing 2 in the axial direction of the main bearing 2, the axially inner side refers to a side closer to the main bearing 2 in the axial direction of the main bearing 2, the radially outer side refers to a side away from the main shaft 1 in the radial direction of the main bearing 2, and the radially inner side refers to a side closer to the main shaft 1 in the radial direction of the main bearing 2.
In the process of rotation of a wind wheel of a wind driven generator, a main shaft 1, a bearing baffle ring 8 and a bearing inner ring 22 rotate synchronously, a bearing end cover 5 and a sealing piece pressing plate 7 keep static relative to a bearing outer ring 21, and a sealing piece 4 does not rotate synchronously along with the main shaft 1, so that the radial inner side surface 42 of the sealing piece can generate friction with the main shaft 1 or the bearing baffle ring 8, the sealing piece 4 is abraded for a long time, main bearing lubricating grease cannot be well sealed, the main bearing lubricating grease is leaked, and the lubricating effect of a main bearing 2 is reduced.
In order to solve the above problem, the embodiment further provides a method for repairing a sealing leakage point of the main bearing of the wind driven generator, and the sealing mechanism is processed in a targeted manner by detecting the specific reason of the leakage of the lubricating grease of the main bearing, so that the lubricating grease of the main bearing can be prevented from being continuously leaked, and the lubricating effect and the service life of the main bearing 2 are improved.
As shown in FIG. 7, the method for repairing the sealing leakage point of the main bearing of the wind driven generator comprises the following steps:
step S1, detecting whether the lubrication channel is unobstructed; if yes, executing step S2, otherwise executing step S4;
step S2, detecting a leakage position of the main bearing grease on the seal 4;
step S3, detecting a cause of leakage of the main bearing grease from a leakage position of the main bearing grease on the seal 4;
step S4 is to process the sealing mechanism based on the detection result.
In this embodiment, whether unobstructed to lubricated passageway detects earlier, if detect out lubricated passageway and not unobstructed, then handle lubricated passageway earlier, need not detect sealing member 4, simplify the detection step, improve detection efficiency. If it is unobstructed to detect out the lubricated passageway, carry out follow-up detection step again, according to main bearing grease leakage position of difference on sealing member 4 look for the reason that leads to main bearing grease to leak, according to concrete leakage reason again, pointed to the place that goes wrong to sealing mechanism handles to can prevent that main bearing grease from continuing to leak, improve the lubricated effect and the life of main bearing 2.
In step S1, the main bearing grease is supplied to the main bearing 2 through the lubrication passage, and whether the main bearing grease can flow into the grease inlet passage and flow out of the grease outlet passage is observed; if so, the lubrication channel is unobstructed, otherwise, it is unobstructed. In step S1, if the lubrication passage is clear, the leakage of the main bearing grease is not related to the lubrication passage, and it is necessary to detect another cause of the leakage of the main bearing grease. If the lubrication channel is not smooth, continuously conveying the main bearing lubricating grease to the interior of the main bearing 2 can cause the internal pressure of the lubrication channel to be too large, so that the main bearing lubricating grease is leaked, and therefore in the step S4, the mode of processing the sealing mechanism is to dredge the lubrication channel.
And after the lubrication channel is dredged, detecting whether the main bearing lubricating grease continuously leaks, and if the main bearing lubricating grease does not continuously leak, solving the problem of main bearing lubricating grease leakage. If the main bearing lubricating grease continuously leaks, other reasons causing the main bearing lubricating grease to leak exist, and the step 2 can be continuously executed to search for other reasons.
If the lubrication channel is detected to be unobstructed, other reasons which can cause the leakage of the main bearing lubricating grease need to be detected, and the leakage reasons can be further judged according to the leakage position of the main bearing lubricating grease on the sealing element 4. In order to identify the leakage position of the main bearing grease on the seal 4, step S10 is further included before step S2: and cleaning the main bearing lubricating grease remained on the main shaft 1, the main bearing 2 and the sealing mechanism. The residual lubricant is cleaned and then observed, so that the judgment error caused by the residual main bearing lubricating grease is prevented. During cleaning, the seal 4 and the seal holding plate 7 need to be removed, and cleaning is emphasized for the seal 4 and the contact surfaces of some structures directly abutting against the seal 4, such as the first contact surface 61 and the second contact surface 62 of the accommodating groove 6 of the bearing end cover 5, the radially outer side surface of the main shaft 1, and the radially outer side surface of the bearing retainer ring 8.
Since the leakage position of the main bearing grease on the seal 4 is not easily detected when the wind turbine is in a stationary state, the leakage position of the main bearing grease on the seal 4 is detected by rotating the wind wheel of the wind turbine in step S2, and the leakage position of the main bearing grease on the seal 4 can be found more accurately.
As shown in fig. 6, step S2 includes the following steps:
step S21, idling a wind wheel of the wind driven generator, and detecting whether a leakage position of main bearing lubricating grease on the sealing element 4 can be found; if yes, go to step S3, otherwise go to step S22;
step S22, arranging a recorder 9 on the outer side of the main bearing 2, and aligning the recorder 9 with the seal 4;
and step S23, electrifying the wind driven generator, rotating the wind wheel of the wind driven generator, and recording the leakage position of the main bearing lubricating grease on the sealing element 4 through the recorder 9.
In order to simplify the maintenance steps, the wind wheel of the wind driven generator is idled to observe whether the leakage position of the main bearing lubricating grease on the sealing element 4 can be found out or not, if the leakage position of the main bearing lubricating grease on the sealing element 4 can be found out, the leakage reason can be continuously found out, and the maintenance efficiency is improved. If the rotor of the idling wind turbine cannot find the leakage position of the main bearing grease on the seal 4, it is necessary to search the leakage position of the main bearing grease on the seal 4 by keeping the wind turbine in a power generation state for a long time. However, since it is impossible for the maintenance personnel to stay on the wind turbine for a long time, a recorder 9 is additionally provided to record the leakage of the main bearing grease. As shown in fig. 6, the recorder 9 is arranged outside the main bearing 2, and the lens of the recorder 9 is aligned with the seal 4 in order to clearly register the location of the leakage of the main bearing grease on the seal 4. The recorder 9 in this embodiment is specifically a video camera, and in other alternative embodiments, other structures with a video recording function may be selected as the recorder 9.
In order to facilitate the inspection personnel to observe the leakage position of the main bearing lubricating grease on the sealing element 4 in real time, the wind driven generator further comprises an information transmission system (not shown in the figure), the recorder 9 is electrically connected with the information transmission system, and the information transmission system is used for transmitting the content recorded by the recorder 9 to the wind driven generator monitoring platform. The image that 9 notes of record appearance were looked over to measurement personnel can be on aerogenerator monitor platform, observes the leakage position of main bearing lubricating grease on sealing member 4 in real time, overhauls sealing mechanism in time, makes main bearing lubricating grease stop leaking as early as possible, improves the lubricated effect and the life of main bearing 2. The specific structure of the position transmission system is known in the art.
Since the seal holding plate 7 is disposed axially outward of the seal 4, step S11 is further included before step S2 in order to clearly observe the position of leakage of the main bearing grease on the seal 4: the seal holder 7 is removed. Or the sealing pressing plate 7 is not installed after the residual main bearing lubricating grease is cleaned, so that the vision of a maintenance worker or the lens of the recorder 9 is prevented from being shielded by the sealing pressing plate 7, and the observation of the sealing 4 is facilitated.
In step S2, if leakage of the main bearing grease on the radially outer surface 41 of the seal is detected, step S3 includes the steps of:
step S311, detecting whether the radial outer side surface 41 of the sealing element is in interference fit with the bearing end cover 5 by using a feeler gauge; if yes, go to step S312, otherwise go to step S4;
step S312, measuring the axial width a of the seal 41And an outer diameter d1；
Step S313, measuring the containing groove6 axial width a2And the diameter d of the accommodation groove 62；
Step S314, setting the outer diameter d of the seal 41And axial width a1And the axial width a of the accommodation groove 62And the diameter d of the accommodation groove 62And comparing the size with the corresponding size in the design drawing to find out the size which does not meet the requirement of the design drawing.
If the main bearing grease leaks from the radially outer surface 41 of the seal, the radially outer surface 41 of the seal comes into contact with the bearing end cover 5, and therefore, it is necessary to consider whether or not there is a problem in the engagement between the radially outer surface 41 of the seal and the bearing end cover 5. Whether interference fit between the sealing element 4 and the bearing end cover 5 is detected by the feeler gauge, if not, the sealing element 4 can be directly replaced without executing subsequent measuring steps, and the detection efficiency is improved. If the sealing element 4 is in interference fit with the bearing end cover 5, whether the fitting size of the sealing element 4 and the bearing end cover 5 meets the design requirement is judged, namely the axial width a of the sealing element 41And the axial width a of the accommodation groove 62And the outer diameter d of the seal 41And the diameter d of the accommodation groove 62To detect the cause of leakage of the main bearing grease.
In step S314, if it is detected that the fitting size of the seal 4 and the bearing end cover 5 does not satisfy the design requirement, that is, the outer diameter d of the seal 41And axial width a1And the axial width a of the accommodation groove 62And the diameter d of the accommodation groove 62Does not meet the corresponding dimensional requirements in the design drawing, it is necessary to ensure the fit between the seal 4 and the bearing end cap 5 by adjusting the corresponding dimensions of the seal 4 to prevent leakage of the main bearing grease on the radially outer side surface 41 of the seal, i.e. in step S4, the sealing mechanism is treated in such a way that the axial width a of the seal 4 is adjusted1And/or the outer diameter d of the seal 41Until the design requirements of each size are met.
In particular, if the outer diameter d of the seal 4 is1And/or the diameter d of the receiving groove 62If the corresponding dimension requirement in the design drawing is not satisfied, the seal is sealed in step S4The mechanism is arranged to adjust the outer diameter d of the seal 41. If the axial width a of the seal 41And/or the axial width a of the receiving groove 62If the dimensional requirements on the design drawing are not satisfied, the sealing mechanism is processed to adjust the axial width a of the seal 4 in step S41。
During actual measurement, it is not necessary that the seal 4 be dimensionally problematic, and it is possible that the size of the bearing end cap 5 does not meet design requirements, but the cost and difficulty of replacing the seal 4 is relatively low compared to replacing the bearing end cap 5.
Step S313 further includes measuring the roughness of the contact surface, and step S314 further includes comparing the roughness of the contact surface with a corresponding surface roughness in the design drawing. The roughness of the contact surface of the bearing cap 5 for abutting against the seal 4 also affects the fit between the bearing cap 5 and the seal 4, and the higher the roughness of the contact surface, the poorer the fit effect.
In step S314, if the roughness of the contact surface is equal to or less than the corresponding surface roughness in the design drawing, the leakage of the main bearing grease is not related to the surface roughness of the contact surface. If the roughness of the contact surface is greater than the corresponding surface roughness on the design drawing in step S314, the sealing mechanism is processed by polishing the contact surface in step S4. Polishing can reduce the roughness of the contact surface and thereby improve the mating effect of the seal 4 and the bearing end cap 5.
If it is detected in step S2 that the main bearing grease leaks from the radially inner surface 42 of the seal, step S3 includes the steps of:
step S321, detecting whether the radial inner side surface 42 of the sealing element is in interference fit with the main shaft 1 or the bearing retaining ring 8 by using a feeler gauge; if yes, go to step S322, otherwise go to step S4;
step S322, checking the damage condition of the radial inner side surface 42 of the sealing element, and judging whether the sealing element 4 can be continuously used; if yes, go to step S323, otherwise go to step S4;
step S323, measuring the radial width b of the seal 4;
step S324, measuring a distance between the first contact surface 61 and the main shaft 1 in the radial direction of the main bearing 2, or measuring a distance between the first contact surface 61 and the bearing retainer ring 8 in the radial direction of the main bearing 2;
step 325, comparing the radial width b of the sealing element 4 and the distance between the first contact surface 61 and the main shaft 1 in the radial direction of the main bearing 2 with corresponding dimensions in a design drawing, and finding out dimensions which do not meet the requirements of the design drawing; or comparing the radial width b of the seal 4 and the distance between the first contact surface 61 and the bearing retainer ring 8 in the radial direction of the main bearing 2 with corresponding dimensions in the design drawing, and finding out dimensions which do not meet the requirements of the design drawing.
Wherein the fit of the seal 4 and the spindle 1 and the relevant dimensions of the spindle 1 are detected if the seal 4 is in direct abutment with the spindle 1. If the seal 4 is directly engaged with the bearing retainer 8, the engagement of the seal 4 and the bearing retainer 8 and the relative size of the bearing retainer 8 are detected.
If the main bearing grease leaks at the radially inner side 42 of the seal, it is necessary to take into account whether the fit between the seal 4 and the main shaft 1 or the bearing retainer 8 is problematic. Whether clearance fit between the sealing element 4 and the main shaft 1 or the bearing retaining ring 8 is detected by the feeler gauge, if not, the sealing element 4 can be directly replaced without executing subsequent measurement steps, and the detection efficiency is improved. If the sealing element 4 is in interference fit with the main shaft 1 or the bearing retaining ring 8, the damage condition of the sealing element 4, including the conditions of abrasion, softening, swelling, cracking and the like, is observed first, and the sealing element 4 is judged to be capable of being used continuously. If not, the sealing element 4 can be directly replaced without performing subsequent measurement steps, thereby improving the detection efficiency. If the seal 4 can be used continuously, the leakage reason of the main bearing lubricating grease is detected by judging whether the matching size of the seal 4 and the main shaft 1 or the bearing baffle ring 8 meets the design requirement.
In step S325, if it is detected that the fitting size of the seal 4 and the main shaft 1 or the fitting size of the seal 4 and the bearing retainer 8 does not satisfy the design requirement, that is, the radial width b of the seal 4 and the distance between the first contact surface 61 and the main shaft 1 in the radial direction of the main bearing 2The one or more dimensions of (a) do not meet corresponding dimensional requirements in the design drawing; alternatively, if one or more of the radial width b of the seal 4 and the distance between the first contact surface 61 and the bearing retainer 8 in the radial direction of the main bearing 2 do not satisfy the corresponding dimensional requirements in the design drawing, the corresponding dimension of the seal 4 needs to be adjusted to ensure the fit between the seal 4 and the main shaft 1 or the bearing end cover 5, so as to prevent the main bearing grease from leaking on the radially inner side surface 42 of the seal. That is, in step S4, the seal mechanism is processed so that the inner diameter d of the seal 4 is adjusted3Until the design requirements of each size are met.
During the actual measurement process, it is not necessary that the seal 4 has a size problem, and it is possible that the size of the main shaft 1 or the bearing retainer ring 8 does not meet the design requirements, but the cost and difficulty of replacing the seal 4 is relatively low compared to replacing the main shaft 1 or the bearing retainer ring 8.
Because the main bearing 2 has a theoretical radial clearance, a certain movement can be generated in the radial direction of the main bearing 2, so that in the rotation process of a wind wheel of a wind driven generator, the radial inner side surface 42 of the sealing element can not be completely abutted with the main shaft 1 or the bearing baffle ring 8 at any time, and the main bearing lubricating grease is leaked from the radial inner side surface 42 of the sealing element. Therefore, in step S325, if the dimension that does not satisfy the requirement of the design drawing cannot be found, step S3 further includes:
step S331, keeping the main shaft 1 in a static state;
step S332, measuring the clearance between the bearing end covers 5 positioned at the topmost and bottommost positions of the main bearing 2 and the main shaft 1; or measuring the clearance between the bearing end cover 5 and the bearing baffle ring 8 which are positioned at the topmost and bottommost positions of the main bearing 2;
step S333 compares the clearance with the theoretical radial play of the main bearing 2.
Because the bearing end cover 5 is of an annular structure, and the bearing end cover 5 moves integrally, the clearances between the bearing end cover 5 and the main shaft 1 or the bearing baffle ring 8 which are positioned at the two ends of the main bearing 2 in the same radial direction are compared with the theoretical radial clearance of the main bearing 2 in the measurement comparison process, so that the result is more accurate. Under the influence of gravity, the change of the clearance between the bearing end cover positioned at the topmost end and the bottommost end of the main bearing and the main shaft is the largest, and if the clearance at the two positions can be less than or equal to the theoretical radial clearance of the main bearing, the clearance between the bearing end cover and the main shaft can be less than or equal to the theoretical radial clearance of the main bearing, so that the clearance at other positions can not be measured, and the measuring process is simplified.
If the clearance is larger than the theoretical radial play of the main bearing 2 in step S333, the seal mechanism is processed in step S4 such that the inner diameter d of the seal 4 is adjusted3. By adjusting the internal diameter d of the seal 43 isThe radial inner side surface 42 of the sealing element can be completely abutted with the main shaft 1 or the bearing baffle ring 8 all the time in the rotating process of the wind wheel of the wind driven generator by the size of the sealing element, so that the lubricating grease of the main bearing is prevented from leaking.
Due to manufacturing errors of the main shaft 1 or the bearing retainer ring 8, the outer diameters of different circumferential positions of the main shaft 1 and the bearing retainer ring 8 are different, so that the sealing element 4 cannot be completely abutted against the main shaft 1 or the bearing retainer ring 8 in a partial region, and main bearing grease leaks from the radial inner side surface 42 of the sealing element. Therefore, in step S325, if the dimension that does not satisfy the requirement of the design drawing cannot be found, step S3 further includes:
step S341, mounting a circular runout instrument on the sealing element pressing plate 7, wherein the circular runout instrument is connected with the main shaft 1 in the radial direction of the main bearing 2;
step S342, idling a wind wheel of the wind driven generator;
step S343, measuring the circular runout of the radial outer side surface of the main shaft 1; or measuring the circular runout of the radial outer side surface of the bearing baffle ring 8;
step S344 compares the circular runout amount of the radial outer side surface of the main shaft 1 or the circular runout amount of the radial outer side surface of the bearing retainer ring 8 with the corresponding circular runout amount in the design drawing.
The specific structure of the circle runout apparatus is the prior art in the field, and is not described herein.
In step S344, if the circular runout amount of the radial outer side surface of the spindle 1 satisfies the corresponding circular runout amount in the design drawing; or the circular runout quantity of the radial outer side surface of the bearing baffle ring 8 meets the corresponding circular runout quantity in the design drawing; the leakage of the main bearing grease is independent of manufacturing tolerances of the main shaft 1 or the bearing collar 8, possibly because the axial pretension of the seal 4 is not sufficient to cause leakage of the main bearing grease. Therefore, in step S4, the seal mechanism is processed so as to increase the axial biasing force of the seal 4.
One way to increase the axial preload of the sealing element 4 is to adjust the preload of the spring that the sealing element 4 embraces. As shown in fig. 4, the sealing element 4 is provided with a receiving groove 45 for receiving a clasping spring (not shown in the figure), the clasping spring extends along the circumferential direction of the main bearing 2, and the axial pretightening force of the sealing element 4 can be improved to a certain extent by shortening the length of the clasping spring. In other alternative embodiments, the axial pretensioning of the seal 4 can also be increased in other ways.
In step S344, if the circular runout amount of the radial outer side surface of the spindle 1 does not satisfy the corresponding circular runout amount in the design drawing; or the circular runout of the radial outer side surface of the bearing baffle ring 8 does not meet the corresponding circular runout in the design drawing; in step S4, the sealing mechanism is processed in such a way that the inner diameter d of the seal 4 is adjusted3。
By adjusting the internal diameter d of the seal 43Is sized so that the radially inner surface 42 of the seal can completely abut against the main shaft 1 or the bearing retainer 8 at each position in the circumferential direction, thereby preventing leakage of the main bearing grease.
The leakage of the main bearing lubricating grease can be caused by more than one reason, so that whether the main bearing lubricating grease continuously leaks needs to be detected again after each overhaul is finished, and if the main bearing lubricating grease does not continuously leak, the problem of the leakage of the main bearing lubricating grease is solved. If the main bearing grease continues to leak, other reasons causing the main bearing grease to leak exist, and other leakage reasons need to be searched.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships in the drawings, are used merely for convenience in describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, should not be construed as limiting the present invention unless otherwise indicated herein.
Although specific embodiments of the invention have been described above, it will be appreciated by a person skilled in the art that this is by way of example only, and that the scope of protection of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.

Claims (20)

1. A maintenance method for a sealing leakage point of a main bearing of a wind driven generator, wherein the wind driven generator comprises a sealing mechanism for sealing lubricating grease of the main bearing, the sealing mechanism comprises a lubricating channel and a sealing element, the lubricating channel is communicated with the lubricating point on the main bearing, the sealing element is arranged on two axial sides of the main bearing, and the sealing element is used for limiting the leakage of the lubricating grease of the main bearing in the main bearing, and the maintenance method for the sealing leakage point of the main bearing of the wind driven generator is characterized by comprising the following steps:
step S1, detecting whether the lubricating channel is unobstructed; if yes, executing step S2, otherwise executing step S4;
step S2, detecting the leakage position of the main bearing grease on the sealing element;
step S3, detecting the leakage reason of the main bearing grease according to the leakage position of the main bearing grease on the sealing element;
and step S4, processing the sealing mechanism according to the detection result.
2. The method for overhauling the sealing leakage point of the main bearing of the wind driven generator as recited in claim 1, wherein the lubricating channel comprises a grease inlet channel and a grease outlet channel, and the grease inlet channel and the grease outlet channel are respectively communicated with a grease inlet and a grease outlet of the main bearing;
in step S1, it is observed whether the main bearing grease can flow into the grease inlet passage and flow out of the grease outlet passage; if yes, the lubrication channel is unobstructed, otherwise, the lubrication channel is obstructed.
3. The method for repairing a leak in a main bearing seal of a wind turbine generator as claimed in claim 1, wherein in step S1, if the lubrication channel is not open, then in step S4 the sealing mechanism is treated by unblocking the lubrication channel.
4. The method for repairing a leakage point of a main bearing seal of a wind turbine according to claim 1, wherein in step S2, the location of the leakage of the main bearing grease on the seal is detected by rotating the rotor of the wind turbine.
5. The method for repairing a leak point of a main bearing seal of a wind turbine as claimed in claim 4, wherein the step S2 comprises the steps of:
step S21, idling a wind wheel of the wind driven generator, and detecting whether a leakage position of main bearing lubricating grease on the sealing element can be found; if yes, go to step S3, otherwise go to step S22;
step S22, arranging a recorder on the outer side of the main bearing, and aligning the recorder with the seal;
and step S23, electrifying the wind driven generator, rotating the wind wheel of the wind driven generator, and recording the leakage position of the main bearing lubricating grease on the sealing element through the recorder.
6. The method for overhauling the leakage point of the main bearing seal of the wind driven generator as set forth in claim 5, wherein the wind driven generator further comprises an information transmission system, the recorder is electrically connected with the information transmission system, and the information transmission system is used for transmitting the content recorded by the recorder to a monitoring platform of the wind driven generator.
7. The wind turbine main bearing seal leak point servicing method of claim 4, wherein the wind turbine further comprises a seal pressing plate disposed axially outward of the seal and abutting the seal, the seal pressing plate for limiting movement of the seal in the direction of the axis of the main bearing;
step S11 is also included before step S2: and removing the sealing element pressing plate.
8. The method for repairing a leak point in a main bearing seal of a wind turbine generator as claimed in claim 1, wherein said wind turbine generator further comprises a main shaft, and said main bearing is sleeved on said main shaft;
step S10 is also included before step S2: and cleaning residual main bearing lubricating grease on the main shaft, the main bearing and the sealing mechanism.
9. The method for repairing a leakage point of a main bearing seal of a wind driven generator according to claim 1, wherein the wind driven generator further comprises a main shaft, a bearing seat, a bearing end cover and a bearing baffle ring, the main bearing is sleeved on the main shaft, the bearing end cover is provided with a containing groove for containing the sealing element, the bearing baffle ring is sleeved on the radial outer side surface of the main shaft, and the bearing baffle ring and the main shaft rotate synchronously;
along the radial direction of the main bearing, one end of the bearing end cover is connected with the bearing seat, the other end of the bearing end cover is abutted with the radial outer side face of the sealing element, and the radial inner side face of the sealing element is abutted with the main shaft or the bearing retaining ring.
10. The method for repairing a leakage point of a main bearing seal of a wind turbine according to claim 9, wherein the step S3 comprises the steps of, if leakage of the main bearing grease on the radially outer surface of the seal is detected in step S2:
step S311, detecting whether the radial outer side surface of the sealing element is in interference fit with the bearing end cover by using a feeler gauge; if yes, go to step S312, otherwise go to step S4;
step S312, measuring the axial width and the outer diameter of the sealing element;
step S313, measuring the axial width of the accommodating groove and the diameter of the accommodating groove;
step S314, comparing the outer diameter and the axial width of the sealing element, the axial width of the accommodating groove and the diameter of the accommodating groove with corresponding dimensions in a design drawing, and finding out dimensions which do not meet the requirements of the design drawing.
11. The method for repairing a leakage point of a main bearing seal of a wind turbine generator according to claim 10, wherein in step S314, if one or more of the outer diameter and the axial width of the seal member, and the axial width of the accommodating groove and the diameter of the accommodating groove do not satisfy the corresponding dimensional requirements in the design drawings, then in step S4, the sealing mechanism is processed in such a manner that the axial width of the seal member and/or the outer diameter of the seal member are/is adjusted.
12. The method of servicing a leak in a wind turbine main bearing seal according to claim 10, wherein said receiving groove comprises a contact surface abutting said seal;
step S313 further includes measuring the roughness of the contact surface, and step S314 further includes comparing the roughness of the contact surface with a corresponding surface roughness in the design drawing.
13. The method for repairing a leakage point of a main bearing seal of a wind turbine generator as claimed in claim 12, wherein in step S314, if the roughness of the contact surface is larger than the corresponding surface roughness of the design drawing, then in step S4, the sealing mechanism is processed by polishing the contact surface.
14. The method of servicing a leak in a wind turbine main bearing seal according to claim 9, wherein said receiving groove has a first contact surface for abutting a radially outer side surface of said seal;
in step S2, if leakage of the main bearing grease on the radially inner surface of the seal is detected, step S3 includes the steps of:
step S321, detecting whether the radial inner side surface of the sealing element is in interference fit with the main shaft or the bearing retaining ring by using a feeler gauge; if yes, go to step S322, otherwise go to step S4;
step S322, checking the damage condition of the radial inner side surface of the sealing element, and judging whether the sealing element can be continuously used; if yes, go to step S323, otherwise go to step S4;
step S323, measuring the radial width of the sealing element;
step S324, measuring a distance between the first contact surface and the main shaft in a radial direction of the main bearing, or measuring a distance between the first contact surface and the bearing retainer ring in the radial direction of the main bearing;
step 325, comparing the radial width of the sealing element and the distance between the first contact surface and the main shaft in the radial direction of the main bearing with corresponding dimensions in a design drawing, and finding out dimensions which do not meet the requirements of the design drawing; or comparing the radial width of the sealing element and the distance between the first contact surface and the bearing baffle ring in the radial direction of the main bearing with corresponding dimensions in a design drawing, and finding out the dimensions which do not meet the requirements of the design drawing.
15. The method for repairing a leakage point of a main bearing seal of a wind turbine generator according to claim 14, wherein in step S325, if one or more of the radial width of the seal and the distance between the first contact surface and the main shaft in the radial direction of the main bearing do not satisfy the corresponding dimension requirements in the design drawing; or, if one or more of the radial width of the seal and the distance between the first contact surface and the bearing retainer ring in the radial direction of the main bearing does not meet the corresponding dimension requirement in the design drawing;
then in step S4 the sealing mechanism is processed in such a way that the inner diameter of the seal is adjusted.
16. The method for repairing a leakage point of a main bearing seal of a wind turbine generator as claimed in claim 14, wherein in step S325, if the dimension which does not meet the design drawing requirements cannot be found, step S3 further comprises:
step S331, keeping the main shaft in a static state;
step S332, measuring gaps between the bearing end covers and the main shaft, wherein the bearing end covers are located at the topmost end and the bottommost end of the main bearing; or measuring the clearance between the bearing end cover and the bearing baffle ring at the topmost and bottommost positions of the main bearing;
and S333, comparing the size of the theoretical radial play of the clearance and the main bearing.
17. The method for repairing a leak in a main bearing seal of a wind turbine according to claim 16, wherein if the clearance is larger than the theoretical radial play of the main bearing in step S333, the sealing mechanism is processed in such a way as to adjust the inner diameter of the seal in step S4.
18. The wind turbine main bearing seal leak point servicing method of claim 14, wherein the wind turbine further comprises a seal pressing plate disposed axially outward of the seal and abutting the seal, the seal pressing plate for limiting movement of the seal in the direction of the axis of the main bearing;
in step S325, if the size that does not satisfy the requirement of the design drawing cannot be found, step S3 further includes:
step S341, mounting a circular runout instrument on the seal pressing plate, where the circular runout instrument is connected to the main shaft in a radial direction of the main bearing;
step S342, idling a wind wheel of the wind driven generator;
step S343, measuring the circular runout of the radial outer side surface of the main shaft; or measuring the circular runout quantity of the radial outer side surface of the bearing baffle ring;
and S344, comparing the circular runout quantity of the radial outer side surface of the main shaft or the circular runout quantity of the radial outer side surface of the bearing retaining ring with the corresponding circular runout quantity in a design drawing.
19. The method for repairing a leakage point of a main bearing seal of a wind turbine as claimed in claim 18, wherein in step S344, if the amount of circular runout of the radially outer side surface of the main shaft satisfies the amount of circular runout corresponding to the design drawing; or the circular runout quantity of the radial outer side surface of the bearing baffle ring meets the corresponding circular runout quantity in the design drawing;
then in step S4 the sealing mechanism is processed in such a way that the axial pretension of the seal is increased.
20. The method for repairing a leakage point of a main bearing seal of a wind turbine as claimed in claim 18, wherein in step S344, if the amount of circular runout of the radially outer side surface of the main shaft does not satisfy the amount of circular runout in the design drawing; or the circular runout quantity of the radial outer side surface of the bearing baffle ring does not meet the corresponding circular runout quantity in the design drawing;
then in step S4 the sealing mechanism is processed in such a way that the inner diameter of the seal is adjusted.
CN202110882350.5A 2021-08-02 2021-08-02 Maintenance method for sealing leakage point of main bearing of wind driven generator Active CN113623151B (en)

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CN212563540U (en) * 2020-07-29 2021-02-19 湘电风能有限公司 Be used for wind generating set driftage bearing, become lubricated oil circuit structure of oar bearing

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CN102323014A (en) * 2011-05-30 2012-01-18 浙江新昌皮尔轴承有限公司 Bearing sealing performance testing method and die for testing
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