CN110162890A - The prediction of Large Type Vertical Motor thrust bearing bearing shell running temperature needs cooling water flow to determine method with minimum - Google Patents
The prediction of Large Type Vertical Motor thrust bearing bearing shell running temperature needs cooling water flow to determine method with minimum Download PDFInfo
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Abstract
The prediction of Large Type Vertical Motor thrust bearing bearing shell running temperature needs cooling water flow to determine method with minimum, belong to motive power machine equipment reliable durable technical field, including thrust bearing solid zoning, the modeling of fluid calculation area three-dimensional and grid dividing, thrust bearing three-dimensional two-way heat flow piercement calculates operating condition and determines, oil cooler design conditions determine, thrust bearing three-dimensional two-way heat flow piercement numerical value calculates, calculate the distribution of operating condition bearing shell running temperature, temperature measuring point temperature and tiling maximum temperature are predicted, any operating condition bush temperature detecting point temperature and maximum temperature are predicted, thrust bearing oil cooler minimum needs cooling water flow to determine.The present invention is suitable for large vertical water pumps unit, the prediction of water turbine set motor thrust bearing bush running temperature and minimum and cooling water flow is needed to determine, to raising motor thrust bearing operational reliability, prolong the service life, improve bearing and design of Cooling System, cooling system operating cost is saved, is of great significance.
Description
Technical field
The invention belongs to motive power machine equipment reliable durable technical fields, are related to a kind of large vertical water pumps unit motor
Slide thrust bearing bearing shell running temperature, the especially prediction technique of thrust bearing shaft tile-base surface maximum temperature, specifically
It is related to a kind of according to thrust bearing parameter, load, the water pump assembly speed of mainshaft, oil cooler and its cooling water parameter, oil
The large vertical water pumps unit motor thrust bearings such as cooler internal incrustation situation predict thrust bearing with operating parameter
Bearing shell running temperature judges whether it is capable of the method for reliable and secure operation and Curve guide impeller.
Background technique
Thrust bearing is the key that large vertical water pumps unit easily mill easily worn part, plays and bears unit rotatable parts axial direction
The important function of power, supports main shaft normal rotation, it is most important to the security and stability of large vertical water pumps unit operation, it is big
Type water pump assembly service life, the main influence governing factor of overhaul life and reliability.Country's pumping plant large pump machine at present
Group thrust bearing uses hydrodynamic lubrication slide thrust bearing mostly, is lubricated by the dynamic pressure effect of lubricating oil film.Study table
Bright, large vertical water pumps unit thrust bearing bearing shell over-heated fault incidence is high, and such failure frequently occurs in drainage drought-resistant
Critical period, seriously affect the normal performance of the functions of pumping stations, threaten the safety of people's lives and properties.The burning of thrust bearing bearing shell
The reason of damage occurs mainly in the tiling of bearing shell, causes thrust bearing bearing shell scaling loss is intricate, and bearing quality is not up to standard, oil is cold
But device cooling capacity is insufficient, units' installation is of poor quality and unit overload operation etc. factor is likely to lead to thrust bearing shaft
Watt scaling loss.Thrust bearing bearing shell temperature element is usually placed in bearing shell steel watt body, the temperature measured and bearing shell tiling temperature
There are larger differences for degree, can not accurately reflect the operating status of thrust bearing, there is no can be realized to large pump units at present
Motor thrust bearing bush pad surface temperature carries out technological means measured directly, and thrust bearing exists cooling not enough or cooling insufficient
The problem of, influence bearing reliability and cooling water system economy.Therefore, it is badly in need of considering that the Large Type Vertical Motor of many factors pushes away
Power bearing bush running temperature Accurate Prediction and oil cooler cooling water minimum need flow to determine method.
Summary of the invention
The purpose of the present invention is lack the prediction of bearing shell running temperature and cooling for above-mentioned Large Type Vertical Motor thrust bearing
Inadequate or cooling insufficient problem proposes that a kind of thrust bearing bearing shell running temperature is predicted and oil cooler cooling water minimum needs
Flow determines that method, the analysis method that computation hydrodynamics is combined with structural finite element analysis comprehensively consider thrust axis
Bearing structure parameter, load, set main shaft revolving speed, oil cooler cooling water parameter, oil cooler fouling condition etc. are because usually predicting
Thrust bearing bearing shell running temperature calculates cooling water minimum and needs flow.It is solid by the three-dimensional two-way hot-fluid of motor thrust bearing
Coupling calculates analysis, obtains thrust bearing parameter, load, controlling rotation speed of main shaft of motor, one timing of oil cooler fouling thickness push away
Thus power bearing bush tiling maximum temperature is used and is inserted with the variation relation of oil cooler cold in-water temperature and water supply flow
The method of value determines the thrust bearing calculated in condition range under any oil cooler cold in-water temperature and water supply flow
Bearing shell tiling maximum temperature realizes the prediction to Large Type Vertical Motor slide thrust bearing bearing shell running temperature, and basis in turn
Bearing shell maximum permissible temperature determines that the oil cooler minimum for guaranteeing that bearing shell does not overheat needs cooling water flow.
The technical scheme is that the prediction of Large Type Vertical Motor thrust bearing bearing shell running temperature needs to cool down with minimum
Water flow determines method, which is characterized in that including following operating procedure:
A. vertical machine thrust bearing solid zoning three-dimensional modeling and grid dividing；
B. the modeling of vertical machine thrust bearing Flow Field Calculation area three-dimensional and grid dividing；
C. vertical machine thrust bearing three-dimensional two-way heat flow piercement calculates operating condition and determines；
D. vertical machine thrust bearing oil cooler design conditions determine；
E. vertical machine thrust bearing three-dimensional two-way heat flow piercement numerical value calculates；
F. it is pre- to calculate the distribution of operating condition bearing shell running temperature, temperature measuring point temperature and tiling maximum temperature for vertical machine thrust bearing
It surveys；
G. any operating condition bush temperature detecting point temperature of vertical machine thrust bearing and maximum temperature are predicted；
H. vertical machine thrust bearing oil cooler minimum needs cooling water flow to determine.
Vertical machine thrust bearing solid zoning three-dimensional modeling described in step A and Meshing Method are as follows:
As shown in Figure 1 and Figure 2, thrust bearing is mounted in the middle part of the oil cylinder of motor upper spider or lower bearing bracket, thrust bearing by anti-heavy bolt,
Bearing shell, runner plate, thrust collar composition.Water pump assembly motor thrust bearing solid zoning is determined, as shown in figure 3, for bearing shell
Quantity is the thrust bearing of m block, and solid zoning includes the thrust of monolithic thrust bearing bearing shell and the 1/m by circumferencial direction point
Head, runner plate, wherein bearing shell is made of steel watt body with superficial layer.Solid zoning is carried out using SpaceClaim software
Three-dimensional modeling carries out the grid dividing of solid zoning using ANSYS Mesh software, and solid zoning all uses six
Face volume mesh.
The modeling of vertical machine thrust bearing Flow Field Calculation area three-dimensional described in step B is as follows with Meshing Method:
As shown in Figure 1, Figure 2, Figure 4 shows, it determines water pump assembly motor thrust bearing Flow Field Calculation region, is for thrust bearing shaft wattage amount
The thrust bearing of m block, flow field regions include the 1/m divided in circumferencial direction by two adjacent thrust bearing shoe valve interval central symmetry axial planes
Whole lubricating oil in upper oil cylinder, lubricant level are water pump assembly top guide bearing center line shown in Fig. 1.Flow Field Calculation area
Domain threedimensional model is established in SpaceClaim software together with the threedimensional model of solid zoning, to guarantee in terms of heat flow piercement
Flow field can be fully mated with solid zoning during calculation.Flow Field Calculation region is divided into comprising between thrust bearing bearing shell and runner plate
The oil cylinder inside region of oil film and oil cylinder lateral area comprising oil cooler.Two regions separately carry out grid dividing, application
ICEM software carries out grid dividing to the upper oil cylinder inside region comprising lubricating oil film, makees at local cypher to the grid at oil film
Reason, and make the refined net at oil film by the scale of certain axial dimension growth rate gradual change to two sides mainstream coarse grid；Using
ANSYS Mesh software carries out grid dividing to the oil cylinder lateral area comprising oil cooler, to the net of oil cooler near-wall
Lattice make local cypher processing, and all Flow Field Calculation regions use hexahedral mesh.
It is as follows that vertical machine thrust bearing three-dimensional two-way heat flow piercement described in step C calculates working condition determining method:
Single watt of load of thrust bearing, thrust collar angular velocity of rotation, oil cooler encrustation thickness are given according to the actual situation, appropriate
Motor thrust bearing oil cooler cooling water import and export average temperature range in, select certain intervals x oil cooler it is cold
But water water-in and water-out mean temperature Tf, x=3~5, including minimum cooling water mean temperature Tf-minIt is average with highest cooling water
Temperature Tf-max, i.e. x oil cooler cooling water mean temperature is Tf1=Tf-min, Tf2..., Tfx-1, Tfx=Tf-max；It is cold to x
But each mean temperature of water mean temperature, within the scope of motor thrust bearing oil cooler water supply flow appropriate, by certain
It is spaced and selectes y oil cooler cooling water flow, y=3~5, including minimum cooling water flow QminMost
Big cooling water flow Qmax, i.e. Q1=Qmin, Q2..., Qy-1, Qy=Qmax, accordingly, it is determined that x × y calculating operating condition.
Vertical machine thrust bearing oil cooler design conditions described in step D determines that method is as follows: numerical value calculates mould
In type, motor thrust bearing oil cooler wall surface thermal boundary condition is set as heat convection wall surface, required calculating input condition
Heat exchange reference temperature and integrated heat transfer coefficient including oil cooler wall surface, it is corresponding that heat exchange reference temperature is set as calculating operating condition
Cooling water outlet and inlet mean temperature Tf, integrated heat transfer coefficient htbAccording to the corresponding cooling water outlet and inlet mean temperature of calculating operating condition
Tf, cooling water flow Q and oil cooler fouling thickness b carry out theoretical calculation to determine.When oil cooler inner wall is without fouling,
The comprehensive heat exchanged thermoresistance of oil cooler wall surface is that forced-convection heat transfer thermal resistance and tube wall heat conduction thermal resistance connect to obtain in managing, wherein in pipe
Forced heat-exchanging thermal resistance is calculated by Dittus-Boelter dimensionless eqations and is determined, Dittus-Boelter dimensionless eqations are as follows:
Nu=cR0.023Re0.8Pr0.4 (1)
In formula: Nu-flow of cooling water nusselt number；cR- oil cooler coil pipe curvature correction factor；Re-cooling water flow
Dynamic Reynolds number, is about cooling water mean temperature TfWith the function of water supply flow Q；Pr-cooling water Prandtl number；Nu definition
With cRExpression formula is respectively as follows:
In formula: forced-convection heat transfer coefficient in h-cooler water pipe；λf- cooling water heat conductance；R0- coil pipe in cooler
Radius of curvature；D1- oil cooler coil pipe interior diameter；For large-size machine, the radius of curvature R of oil cooler coil pipe0Much larger than disk
Bore D1, cRValue takes 1.
Simultaneous formula (1), formula (2), formula (3) solution obtain:
Oil cooler coil pipe tube wall coefficient of heat conduction hλAre as follows:
In formula: λc- oil cooler coil pipe pipe wall material thermal conductivity；D2- oil cooler coil pipe overall diameter.
Thermal conduction resistance connect with heat exchanged thermoresistance after oil cooler wall surface integrated heat transfer coefficient htAre as follows:
Next consider the influence of oil cooler fouling, oil cooler coil pipe encrustation is with a thickness of b, scale crust heat transfer
Coefficient hbAre as follows:
In formula, λb- scale thermal conductivity；B-scale crust thickness.
Under oil cooler fouling condition, it is still cooling water mean temperature that oil cooler inside pipe wall heat exchange reference temperature is constant,
Oil cooler entire thermal resistance is that forced-convection heat transfer thermal resistance, tube wall heat conduction thermal resistance and scale resistance connect to obtain in managing, and is managed at this time
Wall integrated heat transfer coefficient becomes:
In formula: htb- fouling is with a thickness of oil cooler tube wall integrated heat transfer coefficient when b.
Flow of cooling water reynolds number Re is cooling water mean temperature T in formula (8)fWith the function of water supply flow Q, therefore tube wall
Integrated heat transfer coefficient htbIt is cooling water mean temperature Tf, water supply flow Q and fouling thickness b function, i.e. htb=fhtb(Tf,Q,
b)。
The heat flow piercement numerical computation method of vertical machine thrust bearing three-dimensional two-way described in step E is as follows: for solid
Body zoning is solved using ANSYSMechanical software, bearing shell support is simulated using BEAM Unit 188, only
Retain the radially and circumferentially rotary freedom of supporting point；Single watt of axial thrust load loads the table on thrust collar in the form of power
Face only allows the axial displacement freedom degree of thrust collar upper surface；All solids surface in addition to thrust collar upper surface and two sides
It is disposed as fluid structurecoupling interface；The displacement freedom of thrust collar two sides is coupled, the circumferential temperature of coupling mirror plate face is free
Degree；At the top of thrust collar and additional damping unit is respectively set in thrust bearing shoe valve bottom, which passes through 14 spring of COMBIN
Unit realizes that unit spring rate is set as zero, and damped coefficient is arranged according to the specific operating condition that calculates to obtain numerical stability.It is right
It in fluid calculation region, is solved using Fluent software, turbulence model uses SST k- ω two-equation model；Fluid mass
Circumferential two sides are set as swing circle boundary；Suitable initial oil Film thickness values, i.e. bearing shell surface are selected according to the actual situation
With runner plate face initialized gap values；The surface that thrust collar is contacted with lubricating oil is set as the rotation wall surface rotated around the spindle, and revolving speed is set
It is set to electric machine main shaft rotation speed；Wall surface, bottom surface are disposed as without sliding adiabatic wall, lubrication area upper surface inside and outside oil cylinder
It is set as symmetrical border；Surface that thrust collar is contacted with lubricating oil, entire thrust bearing shoe valve surface are set as fluid structurecoupling face；Oil is cooling
Device surface is without sliding wall surface, and thermal boundary condition is set as heat convection wall surface, and the coefficient of heat transfer is counted in step D with reference temperature
It obtains；Upper oil cylinder inside region comprising oil film between bearing shell and runner plate is set as dynamic mesh region, and grid reconstruction mode uses
Spring fairing.Three-dimensional two-way heat flow piercement is calculated, realizes CFD software using ANSYS SystemCoupling module
Bidirectional data exchange between Fluent and finite element analysis software ANSYS Mechanical on fluid structurecoupling interface, every
A iteration step ANSYS transmits the displacement and temperature being calculated to Fluent, and Fluent transmits pressure, heat convection to ANSYS
Coefficient and reference temperature；In heat flow piercement calculating process, thrust collar is total to top axial load and lubricating oil fluid power
It will be along being free to move axially under same-action, and bearing shell then can be under the comprehensive function of fluid force, self gravity and reaction of bearing
Generation radially and circumferentially tilts；On the other hand, heat caused by lubricating oil viscous dissipation and thrust collar, bearing shell are other at oil film
The heat convection of Free Surface can make that temperature gradient can be generated inside thrust collar and bearing shell, cause thrust collar, bearing shell thermal deformation；Base
In Dynamic mesh, the displacement that runner plate face and bearing shell face occur under this thermoelastic comprehensive function can change the thickness point of oil film
Cloth, and then change the heat generated at oil-film force and oil film, and this variation can influence the position of thrust collar and bearing shell in turn
It moves；This process constantly repeats, until when calculating the displacement transmit to fluid structurecoupling face, pressure change very little, it is believed that push away
Power bearing reaches equilibrium state, terminates two-way heat flow piercement and calculates, calculating process schematic diagram is as shown in Figure 5.
Vertical machine thrust bearing described in step F calculate operating condition bearing shell running temperature distribution, temperature measuring point temperature with watt
Face maximum temperature prediction technique is as follows: motor thrust bearing heat flow piercement under the x × y calculating operating condition that logarithm is calculated
Calculated result is post-processed, and each profiling temperatures for calculating operating condition lower bearing can be obtained, by each calculating operating condition
Bush temperature detecting point temperature TmIt is included in table 1, temperature measuring point position is configured according to physical location.
Table 1 respectively calculates motor thrust bearing bush temperature measuring point predicted temperature (unit: DEG C) under operating condition
The thrust bearing shaft tile-base surface maximum temperature T for each calculating operating condition that post-processing is obtainedmaxIt is included in table 2.
Table 2 respectively calculates motor thrust bearing bush tiling prediction maximum temperature (unit: DEG C) under operating condition
Oil cooler cold in-water temperature T is obtained by the conservation of energyinAre as follows:
In formula: Tf- oil cooler cooling water mean temperature；M-thrust bearing shaft tile fragment number；QtubeThe oil of -1/m is cooling
Device tube wall heat flux calculates post-processing by numerical value and obtains；ρ-cooling water density；C-cooling water specific heat capacity；Q-cooling water
Flow.Calculate oil cooler cold in-water temperature T under each operating conditionin, it is included in table 3.
3 motor thrust bearing of table respectively calculates oil cooler cold in-water temperature under operating condition (unit: DEG C)
Any operating condition bush temperature detecting point temperature of vertical machine thrust bearing described in step G and maximum temperature prediction technique
It is as follows: when other operating parameters are constant, thrust bearing shaft tile-base surface maximum temperature TmaxWith bush temperature detecting point temperature TmCan it regard as
It is about oil cooler cold in-water temperature TinWith the function of cooling water flow Q, i.e. Tmax=fTmax(Tin,Q)、Tm=
fTm(Tin, Q), the bearing shell tiling maximum temperature T of x × y calculating operating condition is calculated in numerical valuemaxWith temperature measuring point temperature TmData；
Then, the oil cooler cold in-water temperature T in condition range is being calculated for any one groupinWith water supply flow Q, can pass through
The method of interpolation determines thrust bearing shaft tile-base surface maximum temperature and bush temperature detecting point temperature at this time: table 1-3 is applied first, point
It is not fitted the relational expression that each cooling water calculates flow lower bearing temperature measuring point temperature and cooling water mean temperature: Tm=fTm-Qi
(Tf), the relational expression of i=1,2 ..., y (formula I), bearing shell tiling maximum temperature and cooling water mean temperature: Tmax=fTmax-Qi
(Tf), the relational expression of i=1,2 ..., y (formula II), cooling water mean temperature and inflow temperature: Tf=fTf-Qi(Tin), i=1,
Given inflow temperature is substituted into the formula III under each calculating flow, each cooling water is calculated and calculates by 2 ..., y (formula III)
Cooling water mean temperature when flow, then the calculated cooling water mean temperature is substituted into formula II and formula I respectively, respectively
Tiling maximum temperature and temperature measuring point temperature when solving each calculating flow under the inflow temperature, fitting obtains given water inlet respectively
Relationship between bearing shell tiling maximum temperature when temperature and temperature measuring point temperature and cooling water flow, i.e. Tmax=fTmax-c(Q)、
Tm=fTm-c(Q), thrust bearing shaft tile-base surface maximum temperature at this time can be calculated further according to given cooling water flow
With bush temperature detecting point temperature.It can be actually measured by bush temperature detecting point temperature that interpolation calculation obtains and temperature element under given operating condition
Bush temperature detecting point temperature be compared, with realize check purpose；Through checking, the warm numerical value meter of thrust bearing bearing shell watt of the present invention
Calculation prediction result is accurate, precision is high, with observed temperature difference less than 0.5 DEG C.
Vertical machine thrust bearing oil cooler minimum described in step H needs cooling water flow to determine that method is as follows:
Allow running temperature T with motor thrust bearing bush tiling highestlimitFor restrictive condition, when other operating parameters are constant, root
Required minimum cooling water flow Q is determined according to thrust bearing oil cooler cold in-water temperatured.It has been obtained in step G
Under given cold in-water temperature, bearing shell tiling maximum temperature with oil cooler cooling water flow variation relation formula Tmax=
fTmax-c(Q), the tiling highest of tiling maximum temperature in formula is allowed into running temperature TlimitValue substitutes into, and can find out oil at this time
Cooler minimum needs cooling water flow Qd.The beneficial effects of the present invention are: the present invention proposes a kind of Large Type Vertical Motor sliding
Any operating condition bearing shell running temperature of thrust bearing, the especially prediction technique of bearing shell tiling maximum temperature, and propose in turn really
Protect the calculation method that the thrust bearing oil cooler minimum that bearing shell does not overheat needs cooling water flow.The present invention is widely used in greatly
Large Type Vertical Motor slide thrust bearing bearing shell fortune can be effectively predicted in type vertical water pump unit, water turbine set motor thrust bearing
Trip temperature predicts error less than 0.5 DEG C, calculates bearing shell tiling maximum temperature according to bush temperature detecting point observed temperature, determine thrust
Bearing oil cooler cooling water minimum needs flow, to Large Type Vertical Motor thrust bearing operational reliability is improved, extends and uses
Service life improves thrust bearing and design of Cooling System, saves cooling water operating cost, is of great significance.
Detailed description of the invention
Fig. 1 is the medium-and-large-sized vertical machine upper spider of the present invention and thrust bearing cross-sectional view.
Fig. 2 is the medium-and-large-sized vertical machine thrust bearing bearing shell floor plan of the present invention.
Fig. 3 is medium-and-large-sized vertical machine thrust bearing solid zoning of the invention schematic diagram.
Fig. 4 is the medium-and-large-sized vertical machine thrust bearing fluid calculation area schematic of the present invention.
Fig. 5 is that the medium-and-large-sized vertical water pump unit motor thrust bearing three-dimensional two-way heat flow piercement calculating process of the present invention is shown
It is intended to.
In figure: runner plate 1, anti-heavy bolt 2, bearing shell 3, thrust collar 4, oil cooler 5, top guide bearing 6, cylinder wall 7, lubricating oil
Oil level 8, upper spider 9,1/m thrust collar and runner plate 10, flow field lateral area 11, flow field inside region 12.
Specific embodiment
Below with reference to embodiment, the invention will be further described:
Certain pumping plant large vertical water pumps unit motor thrust bearing includes 8 pieces of identical fan-shaped bearing shells, declared working condition main shaft
Revolving speed 214rpm, single watt of thrust loading 75950N；Fan-shaped bearing shell outer radius 390mm, inside radius 175mm, monolithic bearing shell central angle
45 °, watt thickness 55mm, bearing shell skin-material is elastic metal-plastic, elastic metal-plastic composite bed thickness 8mm, surface composite layer
Edge is away from a watt body edge 10mm, and tiling highest allows 60 DEG C of running temperature, and bearing shell uses anti-heavy bolt support, and supporting point is biased to axis
Watt fuel-displaced side and outside, (supporting point deviates central angle, 1/2 bearing shell of bearing shell center line along runner plate direction of rotation to circumferential eccentricity
Press from both sides the sum and the ratio of the total central angle of bearing shell of both central angles) 0.56, radial eccentricity (radius, bearing shell inside radius at supporting point
The difference and the ratio of bearing shell radial width of the two) 0.57, outer radius is identical with thrust bearing shoe valve in thrust collar runner plate face, lubricates in oil cylinder
Oil is No. 68 lubricating oil；The thrust bearing oil cooler is made of the 3 column copper coil pipes in × 12 row=36 piece, in parallel between each column,
Each column is bordering on around a circle, and three column copper pipes from outside to inside are sequentially connected in series reversed detour by end water tank, coil pipe interior diameter 6mm,
Overall diameter 10mm, in-tube fouling thickness 0mm.Cold in-water temperature is 22 DEG C in certain time, and cooling water flow is adjustable
Section, water supply flow have 4.2m3/h、 5.6m3/h、8.7m3/ h tri- different operating conditions, solve three operating condition lower thrust-bearing bearing shells and survey
Warm spot temperature and tiling maximum temperature.According to pump assembly log, 25.2 DEG C of oil cooler cold in-water temperature, for water flow
Measure 8.7m3/ h, when oil cooler coil pipe non-scaling, thrust bearing bearing shell temperature measuring point observed temperature is 39 DEG C.
A vertical machine thrust bearing solid zoning three-dimensional modeling and grid dividing.
The present embodiment to include shown in Fig. 2 thrust bearing monolithic bearing shell and 1/8 thrust collar, runner plate solid zoning into
Row three-dimensional modeling and grid dividing, solid portion have divided 12300 hexahedral elements altogether.
The modeling of B vertical machine thrust bearing Flow Field Calculation area three-dimensional and grid dividing.
The present embodiment carries out three-dimensional modeling to whole lubricating oil in shown in Fig. 2 1/8 upper oil cylinder, to including thrust bearing
Between bearing shell and runner plate on the inside of the upper oil cylinder of oil film on the outside of flow field regions and upper oil cylinder comprising oil cooler flow field regions respectively into
Row grid dividing makees local cypher processing to the grid at oil film, and increases the refined net at oil film by certain axial dimension
Long rate gradual change makees local cypher processing to the grid of oil cooler near-wall to the scale of two sides mainstream coarse grid.Fluid meter
It calculates model and has divided 1.2 × 10 altogether6A hexahedral mesh unit.
C vertical machine thrust bearing three-dimensional two-way heat flow piercement calculates operating condition and determines.
Thrust bearing single watt of load 75950N, speed of mainshaft 214rpm, oil cooler fouling thickness 0mm, according to thrust axis
Hold oil cooler cold in-water temperature and cooling water range, determine 3 kinds of oil cooler cooling water mean temperatures: 15 DEG C, 20 DEG C,
25 DEG C, 4 kinds of cooling water flows: 2.4m3/h、4.5m3/h、 6.6m3/h、8.7m3/ h, totally 12 kinds of calculating operating conditions.
D vertical machine thrust bearing oil cooler design conditions determine.
According to the oil cooler structure form of the present embodiment, fouling thickness, each cooling level samming calculated under operating condition
Degree and cooling water flow, are calculated the corresponding oil cooler wall surface integrated heat transfer coefficient of each operating condition by formula (8), will
The corresponding oil cooler cooling water outlet and inlet mean temperature of each calculating operating condition and wall surface integrated heat transfer coefficient are as oil cooler
Numerical value design conditions.
E vertical machine thrust bearing three-dimensional two-way heat flow piercement numerical value calculates.
For all 12 kinds of calculating operating conditions, initial oil film thickness takes 100 μm, and spring damping coefficient is set as 1012N.s/m,
Single watt of axial thrust load is loaded in the form of power in thrust collar upper surface, using ANSYS Mechanical software to solid meter
It calculates region to be solved, fluid zoning be solved using Fluent software, using ANSYS System Coupling
Module realizes the bidirectional data exchange between Fluent software and ANSYS Mechanical software, each iteration step ANSYS to
Fluent transmits the displacement and temperature being calculated, and Fluent transmits pressure, convection transfer rate and reference temperature to ANSYS,
When calculating the displacement transmit to fluid structurecoupling face, pressure change very little, it is believed that thrust bearing reaches equilibrium state, terminates
It calculates, is calculated with the three-dimensional two-way heat flow piercement count value that this carries out 12 kinds of water pump assembly motor thrust bearing operating conditions.
It is pre- that F vertical machine thrust bearing calculates the distribution of operating condition bearing shell running temperature, temperature measuring point temperature and tiling maximum temperature
It surveys.
Numerical value is calculated into water pump assembly motor thrust bearing bush temperature measuring point temperature under each calculating operating condition that post-processing obtains
Spend TmIt is included in table, as shown in table 1:
Table 1 respectively calculates motor thrust bearing bush temperature measuring point predicted temperature (unit: DEG C) under operating condition
Numerical value is calculated to the thrust bearing shaft tile-base surface maximum temperature T for each calculating operating condition that post-processing obtainsmaxIt is included in table
In, as shown in table 2:
Table 2 respectively calculates motor thrust bearing bush tiling prediction maximum temperature (unit: DEG C) under operating condition
1/8 oil cooler tube wall heat flux under each operating condition is obtained by post-processing, calculates each work according to formula (9)
Oil cooler cold in-water temperature under condition, is included in table, as shown in table 3:
3 motor thrust bearing of table respectively calculates oil cooler cold in-water temperature under operating condition (unit: DEG C)
Any operating condition bush temperature detecting point temperature of G vertical machine thrust bearing and maximum temperature are predicted.
When oil cooler fouling thickness b=0mm, thrust bearing bearing shell temperature measuring point temperature TmAnd tiling maximum temperature TmaxAnd
It is considered as about oil cooler cold in-water temperature TinWith the function of cooling water flow Q, numerical value is calculated 12
Group Tm=fTm(Tin, Q) data, 12 groups of Tmax=fTmax(Tin, Q) data；Fitting obtains inflow temperature TinAxis at=22 DEG C
Watt temperature measuring point temperature Tm, tiling maximum temperature TmaxWith the variation relation of oil cooler cooling water flow Q, fitting result is respectively as follows:
Tm=-0.0091Q3+0.2001Q2-1.5376Q+40.164 (10)
Tmax=-0.0086Q3+0.1826Q2-1.4003Q+62.54 (11)
Again by cooling water flow Q=4.2m3/h、5.6m3/h、8.7m3/ h substitutes into above-mentioned two formula respectively and can calculate
Corresponding thrust bearing bearing shell temperature measuring point temperature, tiling maximum temperature: 22 DEG C of three different flow 4.2m of inflow temperature3/h、
5.6m3/h、8.7m3The corresponding bush temperature detecting point temperature T of/hmIt is followed successively by 36.56 DEG C, 36.23 DEG C, 35.91 DEG C, corresponding bearing shell
Tiling maximum temperature TmaxIt is followed successively by 59.22 DEG C, 59 DEG C, 58.52 DEG C.
25.2 DEG C of inflow temperature, cooling water flow 8.7m is calculated using same method3Bearing shell tiling highest when/h
61.28 DEG C of temperature, temperature measuring point temperature are 39.08 DEG C, and actual measurement temperature measuring point temperature is 39 DEG C, and error calculates prediction knot in 0.5 DEG C
Fruit is accurate.
H vertical machine thrust bearing oil cooler minimum needs cooling water flow to determine.
Embodiment water pump assembly motor thrust bearing bush tiling highest allows running temperature Tlimit=60 DEG C, oil cooler
Cold in-water temperature TinBearing shell tiling maximum temperature T at=22 DEG CmaxWith oil cooler cooling water flow Q variation relation
It is obtained in step G, sees formula (11), bearing shell tiling highest is allowed into running temperature Tlimit=60 DEG C of substitution formula (11), i.e.,
Oil cooler minimum cooling water flow Q needed for can finding out at this timed, Qd=2.52m3/h。
Large Type Vertical Motor slide thrust bearing bearing shell running temperature can be effectively predicted in the present invention, and prediction error is less than
0.5 DEG C, bearing shell tiling maximum temperature can be calculated according to bush temperature detecting point observed temperature, determine that thrust bearing oil cooler is cooling
Water minimum needs flow, and it is 2.52m that embodiment oil cooler minimum, which needs flow,3The practical water supply flow of/h, only embodiment
28.97%.The present invention prolongs the service life to Large Type Vertical Motor thrust bearing operational reliability is improved, and improves thrust bearing
And design of Cooling System, cooling water system operating cost is saved, is of great significance.
Claims (6)
1. the prediction of Large Type Vertical Motor thrust bearing bearing shell running temperature needs cooling water flow to determine method, feature with minimum
It is, including following operating procedure:
A. vertical machine thrust bearing solid zoning three-dimensional modeling and grid dividing；
B. the modeling of vertical machine thrust bearing Flow Field Calculation area three-dimensional and grid dividing；
C. vertical machine thrust bearing three-dimensional two-way heat flow piercement calculates operating condition and determines；
D. vertical machine thrust bearing oil cooler design conditions determine；
E. vertical machine thrust bearing three-dimensional two-way heat flow piercement numerical value calculates；
F. vertical machine thrust bearing calculates the distribution of operating condition bearing shell running temperature, temperature measuring point temperature and tiling maximum temperature and predicts；
G. any operating condition bush temperature detecting point temperature of vertical machine thrust bearing and maximum temperature are predicted；
H. vertical machine thrust bearing oil cooler minimum needs cooling water flow to determine；
Vertical machine thrust bearing solid zoning three-dimensional modeling described in step A and Meshing Method are as follows: for
Bearing shell quantity is the thrust bearing of m, and solid zoning includes monolithic bearing shell and by circumferencial direction stroke centered on anti-heavy bolt
Thrust collar, the runner plate of the 1/m divided, wherein bearing shell is made of steel watt body with superficial layer, is carried out three-dimensional to solid zoning and is built
Mould and grid dividing；
The modeling of vertical machine thrust bearing Flow Field Calculation area three-dimensional described in step B is as follows with Meshing Method: for
Bearing shell quantity is the thrust bearing of m block, whole lubrications of the flow field regions centered on anti-heavy bolt, in the upper oil cylinder including 1/m
Oil, stream field zoning carry out three-dimensional modeling；Flow Field Calculation region is divided on the inside of the oil cylinder comprising oil film between bearing shell and runner plate
Region and oil cylinder lateral area comprising oil cooler, two parts separately carry out grid dividing, at oil film and oil cooler pipe
Grid near wall makees local cypher processing, and makes the refined net at oil film by certain axial dimension growth rate gradual change to two sides
The scale of mainstream coarse grid；
It is as follows that vertical machine thrust bearing three-dimensional two-way heat flow piercement described in step C calculates working condition determining method: according to
Actual conditions give single watt of thrust load of thrust bearing, thrust collar angular velocity of rotation and oil cooler encrustation thickness, suitable
When motor thrust bearing oil cooler cooling water outlet and inlet average temperature range in, select certain intervals x oil cooler
Cooling water mean temperature Tf, x=3~5, including minimum cooling water mean temperature Tf-minWith highest cooling water mean temperature
Tf-max, i.e. x oil cooler cooling water mean temperature is Tf1=Tf-min, Tf2..., Tfx-1, Tfx=Tf-max；To x cooling water
Each mean temperature of mean temperature, within the scope of motor thrust bearing oil cooler water supply flow appropriate, at regular intervals
Select y oil cooler cooling water flow, y=3~5, including minimum cooling water flow QminIt is cooling with maximum
Water water supply flow Qmax, i.e. Q1=Qmin, Q2..., Qy-1, Qy=Qmax, accordingly, it is determined that x × y calculating operating condition.
2. Large Type Vertical Motor thrust bearing bearing shell running temperature prediction according to claim 1 needs cooling water with minimum
Flow determines method, it is characterised in that: the determination side of vertical machine thrust bearing oil cooler design conditions described in step D
Method, according to the corresponding oil cooler fouling thickness b of calculating operating condition, cooling water mean temperature TfWith cooling water flow Q, pass through
Dittus-Boelter dimensionless eqations, which calculate, determines forced-convection heat transfer thermal resistance in pipe；According to thrust bearing oil cooler coil pipe
Size and material, which calculate, determines coil pipe tube wall heat conduction thermal resistance；Scale resistance is determined according to scale crust thickness and scale thermal conductivity；
Think forced-convection heat transfer thermal resistance in oil cooler coil pipe pipe, scale resistance, tube wall heat conduction thermal resistance three series connection, is calculated
Oil cooler wall surface integrated heat transfer coefficient h after considering thermal resistance series connectiontb, the heat exchange reference temperature of oil cooler inner wall is set as
Calculate the corresponding cooling water mean temperature T of operating conditionf；Wherein
In formula: htb- fouling is with a thickness of oil cooler tube wall integrated heat transfer coefficient when b；Re-flow of cooling water Reynolds number is to close
In cooling water mean temperature TfWith the function of water supply flow Q；Pr-cooling water Prandtl number；λb- scale thermal conductivity；B-scale
Thickness degree；λc- oil cooler coil pipe pipe wall material thermal conductivity；λf- cooling water heat conductance；D1、D2- it is respectively oil cooler disk
Manage inside and outside diameter；
Flow of cooling water reynolds number Re is cooling water mean temperature T in formula (1)fWith the function of water supply flow Q, therefore tube wall is comprehensive
Coefficient of heat transfer htbIt is cooling water mean temperature Tf, water supply flow Q and fouling thickness b function, i.e. htb=fhtb(Tf,Q,b)。
3. Large Type Vertical Motor thrust bearing bearing shell running temperature prediction according to claim 1 needs cooling water with minimum
Flow determines method, it is characterised in that: the heat flow piercement numerical value of vertical machine thrust bearing three-dimensional two-way described in step E calculates
Method, using oil cooler design conditions obtained in step D, to obtain numerical value computational stability, in solid zoning
At the top of thrust collar and additional damping unit is respectively set in thrust bearing shoe valve bottom, which is realized by spring unit, spring
Rigidity is set as zero, and spring damping coefficient is arranged according to the specific operating condition that calculates；It solves and pumps using ANSYS Mechanical software
Unit thrust bearing solid zoning solves pump assembly thrust bearing fluid calculation region, application using Fluent software
ANSYS System Coupling module carries out the data exchange between Fluent software and ANSYS Mechanical software with reality
The three-dimensional two-way heat flow piercement of existing pump assembly thrust bearing calculates.
4. Large Type Vertical Motor thrust bearing bearing shell running temperature prediction according to claim 1 needs cooling water with minimum
Flow determines method, it is characterised in that: vertical machine thrust bearing described in step F calculates operating condition bearing shell running temperature point
Cloth, temperature measuring point temperature and tiling maximum temperature prediction technique, motor under the x × y calculating operating condition that step E numerical value is calculated
Thrust bearing heat flow piercement calculated result is post-processed, and is obtained each profiling temperatures for calculating operating condition lower bearing, is obtained
Bush temperature detecting point temperature T under each calculating operating conditionm, bearing shell tiling maximum temperature Tmax；The oil obtained according to post-processing is cooling
Device tube wall heat flux calculates the oil cooler cold in-water temperature T under each operating condition according to the conservation of energyin。
5. Large Type Vertical Motor thrust bearing bearing shell running temperature prediction according to claim 1 needs cooling water with minimum
Flow determines method, it is characterised in that: any operating condition bush temperature detecting point temperature of vertical machine thrust bearing described in step G with
Maximum temperature prediction technique refers to and comprehensively considers motor thrust bearing structure parameter, bearing load F, speed of mainshaft n, oil cooling
Device encrustation thickness b, oil cooler cold in-water temperature Tin, the factors such as cooling water flow Q, obtained using step F
Each calculating operating condition bearing shell tiling maximum temperature Tmax, temperature measuring point temperature TmWith cold in-water temperature TinData, intended
It closes, realizes the prediction to Large Type Vertical Motor slide thrust bearing bush temperature detecting point temperature and tiling maximum operating temperature；It is pushing away
Power bearing structure parameter, load F, speed of mainshaft n, mono- timing of oil cooler fouling thickness b, the thrust bearing shaft tile-base surface highest temperature
Spend TmaxWith bush temperature detecting point temperature TmIt is about oil cooler cold in-water temperature TinWith the letter of cooling water flow Q
Number, i.e. Tmax=fTmax(Tin,Q)、Tm=fTm(Tin, Q), the bearing shell tiling of x × y calculating operating condition is calculated most in step F numerical value
High-temperature TmaxWith temperature measuring point temperature TmData, for any one group calculate condition range in oil cooler cooling water into
Coolant-temperature gage TinWith water supply flow Q, thrust bearing shaft tile-base surface maximum temperature and bush temperature detecting point temperature are determined by interpolation method:
Applying step F numerical result first is fitted each cooling water respectively and calculates flow lower bearing temperature measuring point temperature and cooling water
The relational expression of mean temperature: Tm=fTm-Qi(Tf), i=1,2 ..., y (formula I), bearing shell tiling maximum temperature and cooling water are average
The relational expression of temperature: Tmax=fTmax-Qi(Tf), the pass of i=1,2 ..., y (formula II), cooling water mean temperature and inflow temperature
It is formula: Tf=fTf-Qi(Tin), given inflow temperature is substituted into the formula III under each calculating flow by i=1,2 ..., y (formula III),
Cooling water mean temperature when each cooling water calculates flow is calculated, then the calculated cooling water mean temperature is distinguished
Formula II and formula I are substituted into, the tiling maximum temperature and temperature measuring point temperature when solving each calculating flow respectively under the inflow temperature
Degree is fitted bearing shell tiling maximum temperature when obtaining given inflow temperature and between temperature measuring point temperature and cooling water flow respectively
Relationship, i.e. Tmax=fTmax-c(Q)、Tm=fTm-c(Q), pushing away at this time can be calculated further according to given cooling water flow
Power bearing bush tiling maximum temperature and bush temperature detecting point temperature；The bush temperature detecting point temperature and given work that interpolation calculation is obtained
The actually measured bush temperature detecting point temperature of temperature element is compared under condition, checks temperature value prediction result.
6. Large Type Vertical Motor thrust bearing bearing shell running temperature prediction according to claim 1 needs cooling water with minimum
Flow determines method, it is characterised in that: vertical machine thrust bearing oil cooler minimum described in step H needs cooling water flow
The method of determination is measured, referring to allows running temperature T with motor thrust bearing bush tiling highestlimitFor restrictive condition, in other fortune
When row parameter constant, according to thrust bearing oil cooler cold in-water temperature, intake using the given cooling water that step G is obtained
At a temperature of, bearing shell tiling maximum temperature with oil cooler cooling water flow variation relation formula Tmax=fTmax-c(Q), by formula watts
Face maximum temperature allows running temperature T with tiling highestlimitValue substitutes into, and the oil cooler minimum found out at this time needs cooling water flow
Measure Qd。
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