CN103807308A - Method for cooling rolling bearing on line of nuclear power station - Google Patents
Method for cooling rolling bearing on line of nuclear power station Download PDFInfo
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- CN103807308A CN103807308A CN201210457346.5A CN201210457346A CN103807308A CN 103807308 A CN103807308 A CN 103807308A CN 201210457346 A CN201210457346 A CN 201210457346A CN 103807308 A CN103807308 A CN 103807308A
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Abstract
The invention discloses a method for cooling a rolling bearing on line of a nuclear power station. The method comprises the following steps: detecting and determining whether the temperature of the rolling bearing reaches or exceeds a pre-warning value; examining and discriminating that the temperature rise of the rolling bearing is caused by overmuch lubricating grease; and purging a bearing chamber of the rolling bearing by virtue of compressed air, detecting the temperature of the rolling bearing after the purging, if the temperature of the rolling bearing decreases to a normal value, stopping the purging, otherwise, purging the bearing chamber of the rolling bearing again, and repeatedly carrying out the operations until the temperature of the rolling bearing decreases to the normal value. The method has the beneficial effects that the temperature of the rolling bearing can be decreased on line without halting, the time is saved, and great economic benefits are achieved.
Description
Technical field
The invention belongs to million kilowatt advanced pressurized water reactor nuclear power plant key technology area, relate to a kind of processing method of fault bearing, relate in particular to a kind of method that nuclear power station is lowered the temperature to rolling bearing online.
Background technique
Nuclear power station and some large enterprises are all used important rotating machinery-large-size machine, the support of rotating machinery rotor, as considered easily for economical, maintenance, in design, mostly adopt rolling bearing, a lot of rolling bearings that use in large-size machine, for example: with the 6.6KV motor of rolling bearing structure the water pump being dragged by it.With respect to other bearings; rolling bearing is by grease lubrication; than the bearing of thin oil lubricant; in actual motion; the temperature of rolling bearing there will be rising and fluctuation; the temperature rise of rolling bearing has even reached shutdown value in some cases; so just the operation of whole equipment is brought to very large impact; bearing temperature rise is long-standing; and being prevalent on the rolling bearing structure of grease lubrication, is also a technical barrier of a ubiquitous puzzlement equipment safety operation on large-size machine and even external large-size machine at home.But for bearing temperature rise, seldom did and studied in great detail, and therefore, at present, for the processing method of rolling bearing temperature rise be: whole equipment is shut down to isolation, then motor is disintegrated, change rolling bearing.Stoppage in transit xegregating unit; can produce the unavailable event of unplanned I0(nuclear safety equipment); the large unit I0 specific consumption (nuclear safety equipment unavailable time and nuclear safety equipment operation technique standard allow the ratio of unavailable time) that increases; exist unit exception to cause unit to fall the risk of power and even shutdown, its directly and Potential economic losses can reach tens million of.And disintegrate and need to drop into maintainer at least 4 people, equipment bearing is changed in maintenance needs the time of about one week, add service lifting, professional welder, transportation, radiation protection officer, more than required manpower at least 8 people, there is waste in man power and material.And rolling bearing in high-temperature area operation, can cause the loss of thin oil in lubricating grease, thereby further cause lubrication failure bearing damage for a long time.
In the various situations of rolling bearing temperature rise, having a kind of situation is that lubricating grease accumulation is too much, has caused rolling bearing temperature rise, and this is a kind of very common problem, but also there is no in the industry treatment measures targetedly at present.
Summary of the invention
The technical problem to be solved in the present invention is; occur that for rolling bearing in prior art problem of temperature rise need to shut down the defect that isolation maintenance causes massive losses, man power and material's waste economically, produces unplanned I0 and higher unit I0 specific consumption, provide a kind of without shutting down, reduce rolling bearing temperature online, save time, have the method that the nuclear power station of great economic benefit is lowered the temperature to rolling bearing online.
The technical solution adopted for the present invention to solve the technical problems is: a kind of method that nuclear power station is lowered the temperature to rolling bearing online, comprises the following steps:
(1), detect rolling bearing temperature rise situation, determine whether the temperature of rolling bearing meets or exceeds early warning value;
(2), in the time that rolling bearing temperature reaches or exceeds early warning value, rolling bearing is checked, screening out is the temperature rise that too much causes rolling bearing due to lubricating grease;
(3), adopt pressurized air to purge the bearing chamber of rolling bearing, after purging, detect the temperature of rolling bearing, if rolling bearing temperature drops to normal value, stop purging, otherwise the bearing chamber fuel filler neck position to rolling bearing purges again, repeat aforesaid operations to rolling bearing temperature and drop to normal value.
In described step (3), before pressurized air purges the bearing chamber fuel filler neck position of rolling bearing, check compressed-air actuated turbidity test, and pressurized air is carried out to cleaning.
In described step (1), detecting rolling bearing temperature rise situation is by the method for monitoring and recording instrument and on-the-spot walkaround inspection, detects rolling bearing body temperature, temperature rise rate.
In described step (1), described early warning value is 70 ℃, or described early warning value reaches 1 ℃/5min for reaching 60 ℃ of above and temperature rise rates.
In described step (2), described checks and refers to rolling bearing:
Gathering of initial grease-added amount record while checking overhaul of the equipments, the historical account of device maintenance, daily supplemental lubrication fat amount; Check the operating condition of rolling bearing; Get rid of oil starvation or other equipment failures and cause rolling bearing temperature rise.
In described step (2), the operating condition of described inspection rolling bearing comprises: the rumble spectrum, the rotation sound of rolling bearing and the temperature rise curve of rolling bearing that detect rolling bearing.
In described step (2), it is the rumble spectrum that the method measured by vibrometer detects rolling bearing.
In described step (3), described compressed-air actuated pressure is 4-5bar.
In described step (3), described purging adopts point to blow mode, and purge time is 3 ~ 5 seconds/time.
In described step (3), the normal value of described rolling bearing temperature is below 60 ℃.
In described step (3), the compressed-air actuated turbidity test of described inspection are that pressurized air is opened in advance, aim at and purge trier purging, check and purge on trier whether leave dirt.
In described step (3), described pressurized air is carried out to cleaning refer to pressurized air is filtered.
Sharpest edges of the present invention are the high problem of processing equipment temperature online; the xegregating unit of need not stopping transport; therefore can not produce the unavailable event of unplanned I0(nuclear safety equipment); reduce greatly and reduce unit I0 specific consumption (nuclear safety equipment unavailable time and nuclear safety equipment operation technique standard allow the ratio of unavailable time); promote the performance index of power station in world's same industry; avoided unit exception to cause unit fall power and even shut down risk, its direct and potential economic benefit can reach tens million of.The present invention can be by online processing means, have avoided, because rolling bearing lubrication problem disassembled equipment brings the input on human and material resources, having reduced shutdown loss, and having saved engineering time.As adopt above method to process the high problem of bearing temperature, 2 people can make equipment recover normal for 2 hours, and has extended to the full extent the repair cycle of equipment.Avoid equipment to bring the input on human and material resources because of lubrication problem disassembled equipment.
When the present invention finds that at detection rolling bearing rolling bearing temperature reaches or exceeds early warning value, and by rolling bearing is checked, draw it is the temperature rise that causes rolling bearing due to the too much problem of lubricating grease, just adopt the method purging, unnecessary lubricating grease is discharged, after unnecessary lubricating grease is discharged from, remaining a small amount of lubricating grease is at rolling element, raceway, being in contact with one another on face of retainer, the effect of nationality wedge forms the lubricated adipose membrane of thin layer, make the lubricated benign state that enters in rolling bearing, remove the temperature rise factor that lubricating grease too much causes, thereby enter the normal operation stage of bearing, at this moment temperature declines gradually and reaches state of equilibrium.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the temperature temporal evolution schematic diagram of the embodiment of the present invention 1;
Fig. 2 is the temperature temporal evolution schematic diagram of the embodiment of the present invention 2;
Fig. 3 is the temperature temporal evolution schematic diagram of the embodiment of the present invention 3;
Fig. 4 is the temperature temporal evolution schematic diagram of the embodiment of the present invention 4.
Embodiment
Understand for technical characteristics of the present invention, object and effect being had more clearly, now contrast accompanying drawing and describe the specific embodiment of the present invention in detail.
Rolling bearing temperature rise phenomenon and analysis:
1, the different phenomenons of the temperature rise of rolling bearing fluctuation different phase:
At the initial stage of device start, there is the temperature process falling after rise afterwards that first rises, be divided into several situations below:
(1), the startup of the interim switchover operation of online equipment:
Rise at the initial stage temperature starting very fast, the ambient temperature while later stoppage in transit from equipment slowly, starts falling or is stabilized in the flex point of running temperature to temperature, and the time used is different in size.The amplitude of temperature rise is large, and the amplitude of falling is also large, and the little amplitude falling after rise of the amplitude of rising is also little, or just there is no the falling of temperature, on a high platform, moves.
(2) the equipment initial start-up of, just having overhauled:
Temperature has a zooming process, rear slow falling.
(3), in grease-added process, occur:
Temperature has a zooming process, the proportional function relation of grease-added amount and temperature rise.
(4), grease-added, crossed and occurred after some time:
Temperature has a uphill process, crosses after the some time and falls after rise to normal, and individual its temperature of other equipment reaches alarming value, extremely else reaches shutdown value.
In equipment running process, temperature occurs rising or fluctuation, is divided into several situations below:
(1), rising appears in temperature in equipment running process, rear decline, forms a hump shape on curve.
(2), rising appears in temperature in equipment running process, on a high platform, move.
(3), fluctuation appears in temperature in equipment running process, class of a curve is like sinusoidal curve.
2, the feature of temperature fluctuation:
(1) there are several situations of fluctuation in the bearing temperature of explaining above, have through fast rise after a while, rear falling fast, have on a platform, stay for some time after fast fall after rise, the starting stage that is characterized in temperature rise rises very fast, after have a mitigation to arrange process, slowly fall after rise after reaching the flex point of a temperature rise, what also have presents quick falling.In time from tens of minutes to hundreds of minutes and even tens hours.
(2), relatively of whole time period of falling after rise from temperature rise and temperature, there is no obvious common feature.
(3), the fluctuation stage right and wrong of temperature are successional, after the temperature fluctuation one-period occurring in above-mentioned several situations completes, the temperature trend of bearing is stable.
(4), the temperature fluctuation that occurs of above-mentioned several situations, the vibration of bearing, sound, mostly without ANOMALOUS VARIATIONS, does not have obvious fault signature from the frequency spectrum of vibration measuring.
(5), the fluctuation that occurs of these equipment bearing temperature, the pattern of bearing is not had to selectivity, on ball bearing He on roller bearing, all can occur.
3, the analysis to bearing temperature fluctuation rising reason
3.1 bearing temperatures stable, is to be based upon the heat producing in bearing operation process, on basis to extraneous distribute heat balance, once balance is broken, can produce corresponding temperature fluctuation.Several temperature fluctuation situations of more than introducing, the most important condition is the heat that bearing produces in operation process, is greater than the heat that bearing apparatus distributes to the external world, the temperature of bearing itself will raise, thereby finds a new equinoctial point.
The frictional behavior of 3.2 rolling bearings is that a contact contacts with line, the mixed friction motion of rolling and slide, because duty ratio is more concentrated, and change also large, thereby producing on two contact surfaces of contact stress, usually be accompanied by elastic contact deformation, and sometimes also produce certain plastic deformation.Motion is irregular rotation and revolution form, and is accompanied by differential sliding.
Oiling agent can be set up one deck oil film between roller surface and rolling element, reduces friction and wear, and its lubricating status is roughly divided into:
(1), hydrodynamic lubrication: the complete ideal of oil film, surface of contact is separated by oil film completely;
(2), elasticity hydrodynamic lubrication: the viscosity of load area oil film increases with the increase of load, and oil film shows as resiliently deformable;
(3), boundary lubrication: surface of contact is not exclusively separated by oil film;
There is the following aspects in the source of the generation heat of 3.3 bearings in operation process:
(1) friction between lubricating grease molecule;
(2) stirring between roller, rotor and lubricating grease, friction;
(3) shear heat effect when lubricating grease is subject to shearing motion in raceway;
(4) friction between roller and retainer;
(5) friction of roller and raceway;
(6) lubricating grease type selecting is improper, boundary lubrication;
(7) heat channel conduction is blocked, and heat can not well distribute;
(8) wriggling of bearing outer ring;
(9) running-in of new bearing;
Having there is variation in so above-mentioned several situations any, will cause the imbalance of heat-dissipating and heat radiation, causes the variation of bearing temperature.
4, the analysis of origin of heat
Phase mutual friction between 4.1 lubricating grease
The lubricating grease that rolling bearing is selected determines according to the operating temperature of bearing, load, revolution, and viscosity to lubricating grease, thickening agent kind, cone penetration, dropping point etc. have strict index request.On the lubricating grease that adsorbs on lubricating grease in raceway, roller, retainer and the lubricating grease contacting with tangent plane place, rotating part edge, in the operation process of bearing, can produce each other surface friction drag, but because the friction factor between lubricating grease is very little, the volume amount that produces relatively friction at lubricating grease is enough large, the fricative heat of this part is little to the contribution of bearing generation temperature rise.But the lubricating grease in raceway is in the situation that having added, and the heat of its generation has contribution to the temperature fluctuation of bearing.
Stirring between 4.2 rollers, rotor and lubricating grease, friction:
This friction pair also can produce heat in the operation process of bearing, because lubricating grease is half trickling body state, this friction is only confined to the friction of the surface of lubricating grease body and roller, rotor, its friction factor is very little, but the lubricating grease loading in bearing in the ordinary course of things, always exceed and participated in lubricated actual requirement directly, in the initial stage of bearing operation, most of lubricating grease is extruded raceway soon in the lubricated starting stage, and be deposited on retainer and the cavity of bearing protecting cover among, and form a profile rolling element is peripheral.In this process, due to the resistance of unnecessary lubricating grease, bearing temperature rises very soon.Although most of unnecessary lubricating grease be extruded at start of run, squeeze the rolling element being also still likely rotated near lubricating grease raceway and bring between raceway, these lubricating grease, in along with the circulation of bearing rotary kinetoplast, are discharged successively on a small quantity.At this moment bearing temperature still continues to rise, can be described as coming across the stage of lubricating grease, according to factors such as lubricating grease quality, loadings in bearing structure, may continue during this period of time tens minutes, in the situation that grease-added amount is too much, can reach several hours even tens of hours.
After unnecessary lubricating grease is discharged from completely, remaining a small amount of lubricating grease is in contact with one another on face rolling element, raceway, retainer, and the effect of nationality wedge forms the lubricated adipose membrane of thin layer, thereby enters the normal operation stage of bearing.At this moment temperature declines gradually and reaches state of equilibrium.That is to say, long-term lubrication is mainly upper relies on this layer of lubricating film to bear.In addition, in the long-term operation process of bearing, the lubricating grease on rolling element and raceway profile nearby and on retainer is along with the variation of temperature, atrophy and separates a part of base oil, slips between raceway, plays supplementary function to lubricating.
The ability that various lubricating grease forms profile in bearing is different, the profile that must form is taller and more straight, running in period is short, low in long-term running middle (center) bearing temperature, and steadily, this is only a kind of more satisfactory lubricating grease, so require also very important to the one-tenth canal of lubricating grease.
The interstage in the cycle of bearing operation, the supplemental lubrication fat adding.The in the situation that in bearing housing, lubricated lubricating grease amount being too much.Can destroy original in type lubricating grease profile, the new lubricating grease adding is together with a large amount of being blended in raceway of the old lubricating grease on the lubricating grease profile subsiding, cause rolling element in the time of work, to again and again overcome the lubricating grease of constantly piling up in orbit, thereby can cause the temperature of bearing to raise, but also can reduce the effect of heat radiation.
Shear heat effect when 4.3 lubricated lubricating grease are subject to shearing motion in raceway:
The experimental research of elastic fluid lubrication theory shows, the lubricating grease of bearing roller and raceway motion contacting part ingress, be subject to rheological parameter and thixotropic the impact under the rolling of roller of lubricating grease itself can produce heat, near oil contact realm entry is subject to stirring can produce heat.
The formation of rolling bearing oil film is a dynamic pressure movement process, roller rotates to form the wedge-shaped oil film of a convergence, roller and raceway are separated, the kinetic pressure balance external load of fluid, now consistent lubricant presents non-Newton fluid characteristic, the pressure that contact area is excessive, and the viscosity of oil film sharply increases, produce resiliently deformable with roller, raceway, multiple reinstatement again simultaneously.
Lubricating grease molecules align under original state in raceway is unordered, after the shearing repeating, could form relative stable state.
Long-term field experience shows, the unnecessary lubricating grease of repeatedly getting back in being rolled into is excessively filled phenomenon in being produced vortex patern by intensively stirred situation (figure) for a long time, can not form the track needing when rolling element is worked and produce a large amount of shear heat, the temperature fluctuation of bearing is had to contribution.
Friction between 4.4 rollers and retainer:
The retainer of bearing has the function of guiding and separation axis bearing roller on bearing framework, avoid the contact between rolling element, retainer is in the operation process of bearing, do inertial rotation except accepting the drive of rolling element, substantially be in freely loosening state, do not bear extra load, the same remarkable fluctuation that is yet not enough to cause bearing temperature of heat that this friction pair of coulomb friction second law " frictional force is directly proportional with the normal load amount of rubbing surface " produces.
The friction of 4.5 rollers and raceway:
(1), all ball bearing, roller bearing all must minimum loads of carrying, to guarantee normal operation.In the running up of bearing, the friction meeting of the inertial force of roller and retainer and lubricating grease produces bad damping function to the rolling of roller, makes roller produce very brief slip in the non-bearing region of raceway.
(2), raceway is greater than the inertial force of roller and retainer to the frictional force of roller.The viscous friction meeting of lubricating grease produces bad damping function to the rolling of roller, and roller can will overcome this viscous friction contrary with roller rotating direction by normal rolling-operation.
List lubricates with regard to soap grease, the running of rolling bearing is that the operation on elastic fluid hydrodynamic lubrication oil film is the most stable, but actual running is that an elastic fluid film lubrication and inelastic fluid are lubricated, boundary lubrication, even sometimes there will be the heterogeneous state (the startup moment of for example bearing) of Dry Sliding Friction and Wear Characteristics.
Rolling bearing is due to the existence of play, the operation of rotating part in raceway is an irregular elliptic motion, and the size of bearing roller is on microcosmic, due to the error in abrasive machining production, also be not exclusively the same, the suffered normal load amount of each roller is also not exclusively uniformly, in the non-load region of bearing, even can not exclusively contact with raceway, when grease-added, owing to more having changed lubricated environment (lubricating grease pour in the increase that causes shear resistance), roller there will be the short time, in the sliding phenomenon of non-load region length, this bears show on the anti-drive end of low-load obvious at rotating machinery.
The coefficient of sliding friction of two friction pairs will be much larger than coefficient of rolling friction, there is data to show sometimes even can reach the hundreds of times of rolling friction, the sliding phenomenon that roller occurs in raceway is the factor that bearing temperature fluctuation raises, the high-load region that the slip of roller is rotated along ellipse in bearing rotor part can disappear, can repeat at non-load area, show on single roller, just formed along oval revolution track and done continuous slip and rotation rolling motion.
The existence of roller slip phenomenon be bearing is had dysgenic, there will be noise, can destroy oil film, the friction factor of roller and raceway is increased, but due to the generation of this phenomenon, be when the suffered normal load amount of roller too small, and lubricated (pouring in of lubricating grease) two conditions of inelastic fluid (fluctuation of temperature seldom appears in the rolling bearing of thin oil lubricant) that occur while simultaneously possessing, one of them condition does not possess, and this phenomenon can disappear thereupon.Impact with respect to whole service life-span of bearing is very little.And be reflected in the temperature variation of bearing, there will be the fluctuation (the shear heat effect of lubricating grease and the slip thermal effect of roller) of temperature
Rolling element resiliently deformable discharge energy be sustainable existence, to the fluctuation of temperature without contribution.
4.6 lubricating grease type selectings are improper, boundary lubrication:
The in the situation that bearing being isolated at lubricant film, seldom wear and tear, while only having destruction of lubricating film or oil film incomplete, just occur.Improper when lubricant oil type selecting, bearing temperature raises extremely, and under PERFORMANCE OF GREASES, in degradation situation, the coated oil when lubricated is unsettled as thin as a wafer, is not enough to two junction to separate, and even can produce the friction between metal, causes the fluctuation of bearing temperature.The in the situation that boundary friction mostly occurring the rotten and lack of lubrication of or lubricating grease improper in lubricating grease type selecting.
4.7 heat channel conductions are blocked, and heat can not well distribute:
The heat-transfer coefficient of lubricating grease is very low, too much lubricating grease, between bearing and external environment condition, form barrier, not only do not have lubrication, and stopped bearing heat and extraneous heat exchange, as discovery processing not in time, along with accumulating of repairing amount, can form " greenhouse effect ", once lubricated operating mode changes, temperature fluctuation is inevitable.
The wriggling of 4.8 bearing outer rings:
Between the raceway of bearing and roller, have the existence of the liquid lubricating film that flows, be the perfect condition that bearing is not worn always, and liquid existence of flowing lubricant film is to rely on the running of parts to form.The moment starting, between the roller of bearing and raceway, be in bad lubricated (border coated oil) state, the raceway (Internal and external cycle) of bearing can be subject to an inertial force, coulomb friction the 3rd law: kinetic force of friction is less than stiction, in matching design due to inner ring and axle, there is tight power, (institute's bearing load is cyclic loading, various piece on inner ring raceway often circles and will lead in turn overladen point of action with axle), can not produce relative movement with axle, and outer ring design is transition fit mode, under the effect of inertial force, can produce the wriggling on circumferencial direction, this wriggling can effectively be avoided the outer collar concentrated wear of bearing.
The effect that above-mentioned inertial force produces bearing outer ring, the moment only starting at bearing occurs, and along with the rotation of bearing, the wriggling of outer ring also can disappear, and does not produce fault.
The running-in of 4.9 new bearings:
The bearing of general new installation is due to the impact of surface roughness, and after running-in, Surface Contact can reach a stable state.And the heat that runing condensation procedure middle (center) bearing produces has contribution to the fluctuation of temperature, along with the prolongation of seating time, bearing operation temperature can tend towards stability.
5, main cause, the solution of bearing temperature fluctuation.This is the concrete enforcement of main technical schemes of the present invention:
The method that nuclear power station is lowered the temperature to rolling bearing online, comprises the following steps:
(1), in the grease-added process of equipment or equipment in service, the phenomenon of temperature rise or temperature fluctuation need to detect rolling bearing temperature rise situation as occurred, determine whether the temperature of rolling bearing meets or exceeds early warning value.
Wherein, detecting rolling bearing temperature rise situation is by the method for monitoring and recording instrument and on-the-spot walkaround inspection, at corresponding rolling bearing, monitoring and recording instrument is set, be used for monitoring the indexs such as rolling bearing body temperature, temperature rise rate, monitoring and recording instrument is reported to the police according to setting early warning value, and records temperature rise situation.Wherein said early warning value is 70 ℃, or early warning value reaches 60 ℃ above and temperature rise rate reaches 1 ℃/5min, and the setting of early warning value is to guarantee can be processed in time in bearing temperature rise process, avoids directly reaching shutdown value.
(2), in the time that rolling bearing temperature reaches or exceeds early warning value, rolling bearing is checked, because rolling bearing temperature rise has a variety of (specifically see below literary composition analyze), screening out is the temperature rise that too much causes rolling bearing due to lubricating grease;
Specifically, described rolling bearing checked and referred to:
1, gathering of the initial grease-added amount record while checking overhaul of the equipments, the historical account of device maintenance, daily supplemental lubrication fat amount; By the grease-added record of the past rolling bearing, analyze the grease-added too much situation that whether exists.
2, check the operating condition of rolling bearing; The operating condition that checks rolling bearing comprises: the rumble spectrum, the rotation sound of rolling bearing and the temperature rise curve of rolling bearing that detect rolling bearing.Wherein the rumble spectrum of rolling bearing is that the method detection of measuring by vibrometer obtains, and vibrometer is connected with rolling bearing, obtains bearing vibration spectrogram, from frequency spectrum, can find out bearing vibration situation.Inspector listens closely to the rotation sound of rolling bearing, rule of thumb judges whether rolling bearing is normal work.On monitoring and recording instrument, monitor rolling bearing temperature rise curve, judge whether rolling bearing exceeds early warning value or shutdown value simultaneously.
3, gathering of the initial grease-added amount record while checking overhaul of the equipments, the historical account of device maintenance, daily supplemental lubrication fat amount; By the past grease-added record of rolling bearing and device maintenance situation, eliminating oil starvation or other equipment failures cause the temperature rise of rolling bearing.
The examination of above-mentioned three steps does not have sequencing, only three steps all need be carried out.
By above analysis, the source that produces heat in bearing operation process has multiple, and what really can cause bearing temperature fluctuation is that lubricating grease is too much, relevant with the initial grease-added amount of bearing, relevant with the daily supplementary oil mass of bearing, relevant with the degree of aging of lubricating grease.To the unsettled sampling of equipment inspection of bearing temperature, bearing is zero defect mostly, and lubricating grease situation is too much or aging, specifically in table 1.
The analysis result of table 1 bearing temperature fluctuation
Generally, the defect of bearing hardware can judge in conjunction with other detection methods by the measurement frequency spectrum of vibration, the temperature that lubricating grease causes raises or fluctuation, can not find obvious fault signature at rumble spectrum, show as simple temperature rise, without association phenomenon of the failure, individual other may show as retainer harmonic frequency on frequency spectrum.Specifically in table 2.
Impact and the confirmation method of table 2 bearing temperature disturbance pattern on equipment
The defect of bearing hardware can judge in conjunction with other detection methods by the measurement frequency spectrum of vibration, the temperature that lubricating grease causes raises or fluctuation, can not find obvious fault signature at rumble spectrum, show as simple temperature rise, without association phenomenon of the failure, individual other may show as retainer harmonic frequency on frequency spectrum.Generally equipment the inside lubricating grease situation is being held inaccurate in the situation that, can be first to equipment repairing, observe temperature variations, discharge situation with lubricating grease, with good conditionsily open bearing (ball) cover inspection, the history of bonding apparatus is lubricated, rumble spectrum situation and expert engineer's suggestion, then determines whether carry out next step.
(3), after examination completes, be confirmed to be the rolling bearing temperature rise that lubricating grease too much causes, just adopt pressurized air to purge the bearing chamber of rolling bearing, described compressed-air actuated pressure is generally 4-5bar.Purge and adopt point to blow mode, once, purge time is 3 ~ 5 seconds/time to short time rapid purging, detects the temperature of rolling bearing after purging, if rolling bearing temperature drops to normal value, the normal value of described rolling bearing temperature refers to below 60 ℃, stops purging.Otherwise the bearing chamber to rolling bearing purges again, repeat aforesaid operations to rolling bearing temperature and drop to normal value.After general purging, unnecessary lubricating grease can be blown out, after unnecessary lubricating grease is discharged from completely, remaining a small amount of lubricating grease is in contact with one another on face rolling element, raceway, retainer, the effect of nationality wedge forms the lubricated adipose membrane of thin layer, thereby in the normal operation stage that enters bearing, at this moment temperature declines gradually and reaches state of equilibrium.
Foreign material in pressurized air enter into bearing chamber, before pressurized air purges the bearing chamber of rolling bearing, check compressed-air actuated turbidity test, and pressurized air is carried out to cleaning.
The compressed-air actuated turbidity test of described inspection are that pressurized air is opened in advance, aim at and purge trier purging, check and purge on trier whether leave dirt.Purging trier is for checking compressed-air actuated article, can adopt the article of various materials, even can also adopt palm, pressurized air is purged palm or other article, check in palm or whether have particulate matter, break flour, liquid etc. on other article, if check and occur dirt, need pressurized air to carry out cleaning, described pressurized air is carried out to cleaning refer to pressurized air is filtered.The mode of filtering can adopt multiple: filter screen, filter core etc., and filtration is a kind of routine techniques, does not repeat them here, and adopts comparatively simple processing method in the present embodiment:, the clean cloth of pad on pressurized air valve, enters in case impurity is short grained.
In purging, because can not causing bearing large size, the stickiness of lubricating grease loses oil, but the also variation of synchronous, close concern bearing temperature in reality purges, is used point to blow method in purging, the time was controlled between 3-5 second, note abnormalities and stop immediately, take further measures.
Below by specific embodiment, further the present invention will be described:
Embodiment 1:
Take code name as D1RCV002MO(Daya Gulf cvcs 002 motor) as example, as shown in Figure 1, in rolling bearing running, carry out after the lubricated work of the automatic greaser of bearing in 800 hours at the rolling bearing of this motor, detecting and find that code name is the drive end bearing temp probe in D1RCV200MT(cvcs 002 motor) temperature of temp probe rises rapidly from 53 ℃ (position 1 Fig. 1) left and right, after two hours, bearing temperature reaches 99.4 ℃ (positions 2 in Fig. 1), rear termination of pumping (termination of pumping value is 100 ℃).
Subsequently rolling bearing is checked the gathering information of the initial grease-added amount record while first checking overhaul of the equipments, the historical account of device maintenance, daily supplemental lubrication fat amount; According to above-mentioned literature record, lubricating grease has enough interpolations, gets rid of the lubricated temperature rise causing of oil starvation.
Restart this equipment, temperature when startup is 47.3 ℃ (positions 3 in Fig. 1), checks the operating condition of rolling bearing; The operating condition that checks rolling bearing comprises: detect the rumble spectrum of rolling bearing, the rotation sound of rolling bearing, wherein the rumble spectrum of rolling bearing is that the method detection of measuring by vibrometer obtains, vibrometer is connected with rolling bearing, obtain bearing vibration spectrogram, from vibration frequency specturm analysis: bearing vibration is all right, not abnormal appearance.In addition, inspector listens closely to the rotation sound of rolling bearing, and rolling bearing rotation sound is normal, thereby show that this bearing is the temperature rise that too much causes bearing due to lubricating grease.
Detect complete, the rolling bearing temperature rise situation of monitoring D1RCV002MO (cvcs 002 motor) drive end, as shown in Figure 1, when temperature rise to 65 ℃ (position 4 in Fig. 1), adopt pressurized air to purge by fuel filler neck position the bearing chamber of rolling bearing, described compressed-air actuated pressure is generally 4bar, carrying out after the purging of a 3s, temperature continues to rise, temperature is up to 80 ℃ (positions 5 in Fig. 1), again purge 5s, after 10 minutes, temperature starts to decline gradually, and after 1 hour 40 minutes, be stabilized in about 51.5 ℃ (position 6 in Fig. 1), other performance vibration index of inspection equipment is normal subsequently.
Embodiment 2:
On April 9th, 2010, L1RIS002PO(ridge Australia reactor-loop safety injection system 002 pump) start after, lower bearing temperature rises to 91.0 ℃ (alarming value is 90 ℃, 100 ℃ of termination of pumping definite values) by 26.5 ℃ before starting, and operator is according to the program L1RIS002PO that stops transport.
As shown in Figure 2, restart this equipment, in latter 10 minutes of startup, motor drive terminal bearing temperature (054MT reactor-loop safety injection system 002 pump drive end bearing temp probe) escalates to 58 ℃ from 28 ℃, in pump group run duration processing procedure, Multiple through then out vibrometer is measured bearing vibration without extremely, vibration performance qualified, rumble spectrum method of measurement, with embodiment 1, does not repeat them here.Because temperature rise rate is very fast, determine to purge immediately intervention, adopt pressurized air to purge by fuel filler neck position the bearing chamber of rolling bearing, described compressed-air actuated pressure is generally 5bar, and before purging, temperature is 58 ℃ (in Fig. 2 shown in position 1), carrying out after the purging of a 5s, temperature continues to rise, and temperature is up to 62 ℃ (in Fig. 2 shown in position 2), again purges 5s, temperature starts to decline gradually, and after 30 minutes, is stabilized in 45 ℃ of left and right; After purge, temperature stabilization is 37 ℃ of left and right (in Fig. 2 shown in position 3).
Embodiment 3:
Since L2RCV002MO(ridge Australia cvcs 002 motor) be example, while evaluation after empty load of motor, motor drive terminal temperature opens after pump rising to 70.1 ℃ equilibrium temperature again.
Subsequently rolling bearing is checked the gathering information of the initial grease-added amount record while first checking overhaul of the equipments, the historical account of device maintenance, daily supplemental lubrication fat amount; According to above-mentioned literature record, lubricating grease has enough interpolations, gets rid of the lubricated temperature rise causing of oil starvation.
Then, check the operating condition of rolling bearing; The operating condition that checks rolling bearing comprises: detect the rumble spectrum of rolling bearing, the rotation sound of rolling bearing, wherein the rumble spectrum of rolling bearing is that the method detection of measuring by vibrometer obtains, vibrometer is connected with rolling bearing, obtain bearing vibration spectrogram, can draw from frequency spectrum: bearing vibration is all right, not abnormal appearance.In addition, inspector listens closely to the rotation sound of rolling bearing, and rolling bearing rotation sound is normal, thereby show that this bearing is the temperature rise that too much causes bearing due to lubricating grease.
Detect complete, the rolling bearing temperature rise situation of monitoring motor drive terminal, as shown in Figure 3, in temperature rise when to 70.1 ℃ (in Fig. 3 shown in position 1), adopt pressurized air to purge by fuel filler neck position the bearing chamber of rolling bearing, described compressed-air actuated pressure is generally 4.5bar, carrying out after the purging of a 4s, temperature drops to 65 ℃ (in Fig. 3 shown in position 2), but or higher than early warning value, again purge 5s, there is no significant change, be stabilized in 64.5 ℃, again purge 5s, temperature starts fast-descending, and after 35 minutes, be stabilized in 50 ℃ of left and right (in Fig. 3 shown in position 3), other performance vibration index of inspection equipment is normal subsequently.
Embodiment 4:
Since L1RCV002MO(ridge Australia cvcs 002 motor) be example:
Rolling bearing is checked to the gathering information of the initial grease-added amount record while first checking overhaul of the equipments, the historical account of device maintenance, daily supplemental lubrication fat amount; According to above-mentioned literature record, lubricating grease has enough interpolations, gets rid of the lubricated temperature rise causing of oil starvation.
Then, check the operating condition of rolling bearing; The operating condition that checks rolling bearing comprises: detect the rumble spectrum of rolling bearing, the rotation sound of rolling bearing, wherein the rumble spectrum of rolling bearing is that the method detection of measuring by vibrometer obtains, vibrometer is connected with rolling bearing, obtain bearing vibration spectrogram, can draw from frequency spectrum: bearing vibration is all right, not abnormal appearance.In addition, inspector listens closely to the rotation sound of rolling bearing, and rolling bearing rotation sound is normal.
In the process of refueling at motor, as shown in Figure 4, temperature fast rise after refueling, from 57 ℃ of fast rise, climbing speed reaches 1 ℃/min, temperature rise to 84 ℃ purges (in Fig. 4 shown in position 1) for the first time, and purge time is 5s, and temperature continues to rise to 93 ℃, purge for the second time (in Fig. 4 shown in position 2), purge time is 4s, and temperature declines rapidly, is finally stabilized in 54 ℃ (in Fig. 4 shown in position 3).
From above-described embodiment, find out, solve lubricating grease and too much cause that temperature is high, adopting method of the present invention is effectively the rising of processing bearing temperature to be had to the effect of getting instant result.
Claims (12)
1. the method that nuclear power station is lowered the temperature to rolling bearing online, is characterized in that, comprises the following steps:
(1), detect rolling bearing temperature rise situation, determine whether the temperature of rolling bearing meets or exceeds early warning value;
(2), in the time that rolling bearing temperature reaches or exceeds early warning value, rolling bearing is checked, screening out is the temperature rise that too much causes rolling bearing due to lubricating grease;
(3), adopt pressurized air to purge the bearing chamber of rolling bearing, after purging, detect the temperature of rolling bearing, if rolling bearing temperature drops to normal value, stop purging, otherwise the bearing chamber to rolling bearing purges again, repeat aforesaid operations to rolling bearing temperature and drop to normal value.
2. the method that nuclear power station according to claim 1 is lowered the temperature to rolling bearing online, it is characterized in that, in described step (3), before pressurized air purges the bearing chamber of rolling bearing, check compressed-air actuated turbidity test, and pressurized air is carried out to cleaning.
3. the method that nuclear power station according to claim 1 and 2 is lowered the temperature to rolling bearing online, it is characterized in that, in described step (1), detecting rolling bearing temperature rise situation is by the method for monitoring and recording instrument on-the-spot walkaround inspection, detects rolling bearing body temperature, temperature rise rate.
4. the method that nuclear power station according to claim 1 and 2 is lowered the temperature to rolling bearing online, it is characterized in that, in described step (1), described early warning value is 70 ℃, or described early warning value reaches 60 ℃ above and temperature rise rate reaches 1 ℃/5min.
5. the method that nuclear power station according to claim 1 and 2 is lowered the temperature to rolling bearing online, is characterized in that, in described step (2), described checks and refer to rolling bearing:
Gathering of initial grease-added amount record while checking overhaul of the equipments, the historical account of device maintenance, daily supplemental lubrication fat amount;
Check the operating condition of rolling bearing;
Get rid of oil starvation or other equipment failures and cause rolling bearing temperature rise.
6. the method that nuclear power station according to claim 5 is lowered the temperature to rolling bearing online, it is characterized in that, in described step (2), the operating condition of described inspection rolling bearing comprises: the rumble spectrum, the rotation sound of rolling bearing and the temperature rise curve of rolling bearing that detect rolling bearing.
7. the method that nuclear power station according to claim 6 is lowered the temperature to rolling bearing online, is characterized in that, in described step (2), is the rumble spectrum that the method measured by vibrometer detects rolling bearing.
8. the method that nuclear power station according to claim 1 and 2 is lowered the temperature to rolling bearing online, is characterized in that, in described step (3), described compressed-air actuated pressure is 4-5bar.
9. the method that nuclear power station according to claim 1 and 2 is lowered the temperature to rolling bearing online, is characterized in that, in described step (3), described purging adopts point to blow mode, and purge time is 3 ~ 5 seconds/time.
10. the method that nuclear power station according to claim 1 and 2 is lowered the temperature to rolling bearing online, is characterized in that, in described step (3), the normal value of described rolling bearing temperature is below 60 ℃.
The method that 11. nuclear power station according to claim 2 are lowered the temperature to rolling bearing online, it is characterized in that, in described step (3), the compressed-air actuated turbidity test of described inspection are that pressurized air is opened in advance, aim at and purge trier purging, check and purge on trier whether leave dirt.
The method that 12. nuclear power station according to claim 2 are lowered the temperature to rolling bearing online, is characterized in that, in described step (3), described pressurized air is carried out to cleaning refer to pressurized air is filtered.
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| CN105240414A (en) * | 2015-10-10 | 2016-01-13 | 广西大美电器有限公司 | Automatic control system |
| WO2022199176A1 (en) * | 2021-03-24 | 2022-09-29 | 中国核电工程有限公司 | Lubrication monitoring method and system for important rotating device of nuclear island, and nuclear island system |
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| CN103807308B (en) | 2016-09-14 |
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Address after: Shenzhen science and technology building, No. 1001 Futian District Road, Shenzhen city in Guangdong province 518031 17-19 floor Applicant after: China General Nuclear Power Corporation Applicant after: Dayawan Nuclear Power Running Management Co., Ltd. Address before: Shenzhen science and technology building, No. 1001 Futian District Road, Shenzhen city in Guangdong province 518031 17-19 floor Applicant before: China Guangdong Nuclear Power Group Co., Ltd. Applicant before: Dayawan Nuclear Power Running Management Co., Ltd. |
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Free format text: CORRECT: APPLICANT; FROM: CHINA GUANGDONG NUCLEAR POWER GROUP CO., LTD. TO: CHINA GENERAL NUCLEAR GROUP CO., LTD. |
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