CN206929032U - Shafting cooling device and wind power generating set for wind power generating set - Google Patents
Shafting cooling device and wind power generating set for wind power generating set Download PDFInfo
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- CN206929032U CN206929032U CN201720538479.3U CN201720538479U CN206929032U CN 206929032 U CN206929032 U CN 206929032U CN 201720538479 U CN201720538479 U CN 201720538479U CN 206929032 U CN206929032 U CN 206929032U
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- injector head
- shafting
- moving axis
- wind power
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- 238000001816 cooling Methods 0.000 title claims abstract description 88
- 238000002347 injection Methods 0.000 claims description 17
- 239000007924 injection Substances 0.000 claims description 17
- 230000006835 compression Effects 0.000 claims description 15
- 238000007906 compression Methods 0.000 claims description 15
- 230000007246 mechanism Effects 0.000 claims description 7
- 238000003860 storage Methods 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 4
- 230000001154 acute effect Effects 0.000 claims description 3
- 238000005507 spraying Methods 0.000 abstract description 9
- 238000012546 transfer Methods 0.000 description 19
- 239000012530 fluid Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 108010066278 cabin-4 Proteins 0.000 description 3
- 239000004519 grease Substances 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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Abstract
The utility model provides a kind of shafting cooling device and wind power generating set for wind power generating set, the wind power generating set may include shafting, the shafting may include moving axis, dead axle and the bearing being arranged between the moving axis and dead axle, and the moving axis can have recess.The shafting cooling device may include more than one injector head and the compressed air supply system being connected with the injector head.The injector head can be fixed on the stationary parts of the shafting, for spraying compressed air to the female portion when wind power generating set is run, so as to effectively be cooled down to the position for being not easy to cool down in wind power generating set running, and can be by cooling down moving axis and cooling bearing indirectly.
Description
Technical field
Technical field of wind power is the utility model is related to, more particularly, is related to a kind of shafting for wind power generating set
Cooling device and wind power generating set including the cooling device.
Background technology
Wind power generating set drives generator amature to rotate and mechanical energy thus is changed into electricity by the rotation of blade
Can, the rotation of blade is delivered to the rotor of generator by the moving axis in the shafting of wind power generating set, and the dead axle in shafting is consolidated
Surely arrive the base of wind power generating set and be connected to stator, so that generator unit stator remains stationary as, by axle between dead axle and moving axis
Hold support.In the process of running, with the lasting rotation of moving axis, supporting the bearing of moving axis and dead axle can produce wind power generating set
Amount of heat, shafting temperature is set constantly to raise.And some wind power generating sets for being located at high temperature high altitude localities especially occur
The too high problem of shafting temperature, the particularly bearing portions in shafting.If shafting is in the condition of high temperature for a long time, the oil in shafting
Fat meeting accelerated ageing or failure, the shafting grease of failure can be run on wind power generating set produces uncertain influence, for example,
Grease failures can aggravate generation hot in shafting in turn, so as to trigger vicious circle.Therefore, it is necessary to shaft (particularly axle
Hold) continue and efficiently cool down, to prevent shafting temperature too high.
Existing shafting (or moving axis, bearing) cooling scheme be tower bottom using centrifugal blower to top air-supply or
Exhausting, in air-flow by taking away the heat as caused by shafting during moving axis inner ring, so as to cool down shafting.However, using centrifugation wind
When machine is cooled down, because the air-flow that centrifugal blower blows is difficult to reach the concave inward structure for being formed at moving axis, (or air flow is dead
Area) so that air, which is difficult to flowing, at these structures causes high-temperature gas to be assembled, therefore cooling scheme of the prior art can not
Effectively reduce the temperature of bearing.
Utility model content
To solve above mentioned problem existing for prior art, the utility model provides a kind of shafting for wind power generating set
Cooling device.The wind power generating set may include shafting, and the shafting may include moving axis, dead axle and be arranged on the moving axis
Bearing between dead axle, the moving axis can have recess.The shafting cooling device may include more than one injector head
And the compressed air supply system being connected with the injector head.The injector head can be fixed on the stationary parts of the shafting
On, and the injector head may be provided near the female portion, for spraying compressed air to the female portion.
According to embodiment of the present utility model, the wind power generating set can also include brake disc crossbeam, the injector head
It is securable on the brake disc crossbeam or is fixed on the dead axle.
According to embodiment of the present utility model, the injector head may be set so that the pressure ejected from the injector head
The direction of motion of contracting air is opposite in circumferential direction with the direction of motion of the moving axis inwall.
According to embodiment of the present utility model, the injector head is securable to the end of the crossbeam, and with the crossbeam
The angle of formation can be acute angle.
According to embodiment of the present utility model, the compressed air supply system may include air compressor, air accumulator with
And air conduit, the air compressor, the air accumulator and the injector head are connected by the air conduit.
According to embodiment of the present utility model, the compressed air supply system may be disposed at the base of wind power generating set
Or on tower roof panel.
According to embodiment of the present utility model, the air conduit can be drawn from the air compressor, with the gas storage
The tower inwall that wind power generating set can be continued on after tank connection is arranged upwards, and is finally connected with the injector head.
According to embodiment of the present utility model, the compressed air supply system can be two or more.
According to embodiment of the present utility model, the compressed air supply system may include the first compressed air supply system
With the second compressed air supply system, first compressed air supply system may include the first pressure for preparing compressed air
Contracting machine and the first air accumulator for storage by the standby compressed air of first compression mechanism；The second compressed air supply
Device may include the second compressor for preparing compressed air and empty by the standby compression of second compression mechanism for storing
Second air accumulator of gas.
According to embodiment of the present utility model, the shafting cooling device can also include controller, and the controller can base
First compressed air supply system described in temperature control in the bearing and second compressed air supply system are alternately
Compressed air is provided to the injector head.
According to the utility model, there is provided a kind of wind power generating set, the wind power generating set include axle as described above
It is cooling device.
The utility model cools down by using compressed air to the moving axis of wind-driven generator, and empty using injection compression
The injector head of gas is directly toward the recess for the moving axis for being formed at wind power generating set, can be adequately cooled the recess,
And then effectively cooling bearing part.
In addition, the utility model in the injector head for spraying compressed air in the case of remains stationary, utilize compression
Air is cooled down by convection heat transfer' heat-transfer by convection to the moving axis of rotation, and the moving axis and then cooling settings after cooling are between moving axis and dead axle
Bearing, in the presence of moving axis rotation, compressed air can be made fully and be equably ejected on moving axis, and then make whole bearing
Adequately and uniformly cooled down.
In addition, the utility model by the injector head for spraying compressed air by being arranged on the stationary parts of wind power generating set
Go up and injector head is arranged near the recess of moving axis, make that the installation of shafting cooling device is convenient, saves space, while can be
The abundant and with strong points cooling of moving axis progress to rotation in the case that shafting cooling device remains stationary as, and then can be effective
Ground reduces the temperature of bearing.
In addition, the utility model by using two or more platforms compressed air supply system (may include compressor and
Air accumulator) cooled down moving axis by turns, can make preparation compressed air air compressor will not continuous working period it is long,
So as to greatly increase the life-span of compressor, and then reduce maintenance or change number, while enough pressures are stored using air accumulator
Contracting air, it can be ensured that uniform and sufficient compressed air can be used for cooling down shafting.
Brief description of the drawings
By the description carried out below in conjunction with the accompanying drawings, above and other purpose and feature of the present utility model will become more
Add it is clear, wherein：
Fig. 1 is the schematic diagram for the exemplary shafting for showing wind power generating set；
Fig. 2 is the signal for showing the wind power generating set comprising shafting cooling device according to embodiment of the present utility model
Figure；
Fig. 3 is the signal for showing the injector head installation site in the shafting cooling device according to embodiment of the present utility model
Property sectional view；
Fig. 4 is the schematic elevational view for showing the injector head installation site in shafting cooling device；
Fig. 5 is the schematic diagram for showing the exemplary injector head according to embodiment of the present utility model；
Fig. 6 is to show the indicative flowchart for controlling shafting cooling device to operate.
Drawing reference numeral explanation：
1st, wheel hub；2nd, blade；3rd, generator；4th, cabin；5th, tower；6th, tower roof panel；7th, base；10th, moving axis；11、
Moving axis inwall；12nd, dead axle；13rd, grease；20th, bearing；21st, bearing outer ring；22nd, bearing inner race；30th, brake disc；31st, brake disc
Crossbeam；100th, shafting cooling device；101st, compressed air supply system；101a, the first compressed air supply system；101b,
Two compressed air supply systems；111st, air common excretory duct；111a：First air conduit；111b, the second air conduit；111c, master
Air conduit；121st, injector head；121a, the first injector head；121b, the second injector head.
Embodiment
The utility model is more fully described hereinafter with reference to accompanying drawing, example of the present utility model is shown in the drawings
Property embodiment.However, the utility model can be implemented in many different forms, and it should not be construed as limited to institute here
The embodiment of proposition.On the contrary, these embodiments are provided so that the disclosure will be thorough and complete, and by model of the present utility model
Enclose and be fully conveyed to those skilled in the art.In the accompanying drawings, identical label represents identical element all the time.
As depicted in figs. 1 and 2, wind power generating set includes wheel hub 1, blade 2, generator 3, cabin 4, tower 5.
Specifically, tower 5 is fixed on ground or other pedestals, for supporting the portions such as engine room foundation 7, generator 3
Part.The base 7 of cabin 4 is connected to the top of tower 5, and cabin 4 may include the parts such as driving, engine room control cabinet, engine room cover of going off course
(not shown), for being controlled and protecting to wind power generating set.
Generator 3 is connected with base 7, and blade 2 is connected to wheel hub 1, and wheel hub 1 is connected to generator 3, and blade 2 drives in wind-force
Dynamic lower rotation, and then drive wheel hub 1 to rotate, kinetic energy is passed to generator 3 by wheel hub 1, and electricity is converted kinetic energy into by generator 3
Can, final realize generates electricity.
Wind power generating set also includes shafting.As shown in figure 1, shafting mainly includes moving axis 10, dead axle 12 and for propping up
The bearing 20 of racking axle 10 and dead axle 12.Blade 2 connects wheel hub 1, and wheel hub 1 connects moving axis 10, moving axis 10 and then is connected to generating
The rotor (not shown) of machine 3, to realize from blade 2 to the machine driving of the rotor of generator 3.Dead axle 12 is connected to generator 3
Stator (not shown) and be connected to the base 7 of wind power generating set, remained stationary as with the stator of fixed generator 3.Bearing 20
Bearing outer ring 21 be attached to dead axle 12, bearing inner race 22 is attached to moving axis 10, to support moving axis 10 and dead axle 12, and realizes rotation
Cooperation between rotation member moving axis 10 and fixed component dead axle 12.
According to exemplary embodiment of the present utility model, show that shaft system arrangement is located at inner side, dead axle 12 for moving axis 10
In outside.In the wind power generating set overall design stage, in order to meet design requirement, such as：Load, intensity etc., moving axis can quilts
The structure with recess is designed to, such as arrow pointed location in Fig. 1.Utilize centrifugal air-supply cooling scheme of the prior art
When, such as centrifugal blower is used to top air-supply or exhausting in tower bottom, in air-flow by being taken away during moving axis inner ring by axle
Heat caused by system, so as to cool down shafting, in the process, air-flow is difficult to enter the recess for being formed at moving axis 10, therefore leads
Cause in the recess assemble high temperature air and be difficult to flowing cold air swap so that the moving axis 10 at recess with
And the temperature of bearing 20 constantly raises, prevent moving axis 10 and bearing 20 from being cooled efficiently cooling.In addition, using traditional
Centrifugal air-supply cooling scheme is, it is necessary to centrifugal blower continuous firing, to supply continuous air-flow, the continuous running meeting of centrifugal blower
The life-span of centrifugal blower is greatly reduced, thus increases the inconvenience brought by repair and replacement.
Further, since the relative motion between the bearing inner race 22 of the rotation of servo axis 10 and the bearing outer ring 21 remained stationary as
Friction so that bearing 20 produces substantial amounts of heat in wind power generating set running, turns into the more significant portion of heat production in shafting
Position, simultaneously because bearing 20 between moving axis 10 and dead axle 12, can not be used to bearing 20 and directly cooled, therefore, it is necessary to examine
Worry is cooled indirectly to bearing 20.
The utility model provides a kind of shafting cooling device 100 for wind power generating set, the shafting cooling device
100 may include more than one injector head 121 (121a, 121b) and the compressed air being connected with the injector head 121 supply
Device 101 (101a, 101b), to pass through injector head 121 using the compressed air provided by the compressed air supply system 101
The recess for being formed at moving axis 10 is ejected into, to be cooled down when wind power generating set is run to the recess of moving axis 10, is entered
And cool down whole bearing 20.
, can be cold by first being carried out to moving axis 10 or dead axle 12 because bearing 20 is arranged between moving axis 10 and dead axle 20
, and then cooling bearing 20 but.In view of it is expected that bearing 20 is uniformly cooled, in embodiment of the present utility model, will be used to spray
The injector head 121 for penetrating compressed air is arranged on the stationary parts of shafting, and makes injector head 121 towards the recess of moving axis 10,
To use the recess of the compressed air cooling moving axis 10 ejected from injector head 121.By carrying out convection current to moving axis 10 first
Cooling, and due in wind turbine power generation unit running process, to the moving axis 10 of rotation in the case of the remains stationary of injector head 121
Cooled down, can make cooling device is stable to arrange.Additionally, due to the turning effort of moving axis 10, and make from static injector head
121 compressed airs ejected can be equably ejected on moving axis 10, so that bearing 20 can be cooled down uniformly.And such as
Fruit is cooled down using the compressed air of injection to dead axle 12, i.e. fixed point cooling, can make the cooled part of dead axle 12 and the portion
The tactile bearing portions temperature of tap is significantly lower than other parts, makes cooling effect uneven, and dead axle 12 is as local in addition
It is cooled and expands with heat and contract with cold, so as to deform, extrudes bearing, cause bearing load to increase, make its service life reduction, it is therefore, right
Dead axle 12 carries out cooling so that the mode of cooling bearing 20 is undesirable indirectly.
As described in Fig. 2 to Fig. 4, shafting cooling device 100 provided by the utility model may include：Compressed air supply system
101st, the air common excretory duct 111 that is connected with compressed air supply system 101 and be connected to air conduit 111 exit spray
Penetrate first 121.Compressed air supply system 101 is used to supply compressed air, and compressed air is transported to injection by air conduit 111
First 121, the component locations that injector head 121 cools down blast injection to needs, especially, the recess of moving axis 10.
In order to which by the recess of blast injection to moving axis 10, it is attached that injector head 121 may be disposed at the female portion
Closely, and the outlet of injector head 121 is made towards the female portion.
According to exemplary embodiment of the present utility model, compressed air supply system 101 could be arranged to two or more, with
Alternately compressed air is supplied to injector head 121.
In embodiment of the present utility model, compressed air supply system 101 may include compressor and air accumulator.Utilize
Compression mechanism starts the compressed-air-storing being prepared by compressor for compressed air in air accumulator to spray
Afterwards, compressed air stable and enough from air accumulator can eject.Although it is shown as that there are two compressed airs to supply
Device 101a and 101b, but it is also possible to using independent one or more than two, supplied when using separate unit or more compressed airs
During device 101, single or multiple compressors, air accumulator, air conduit and injector head accordingly can be used.Obviously, injector head
121 could be arranged to one or more.Compressed air supply system 101 can be individually empty to a supply compression of injector head 121
Gas, compressed air can also be supplied to multiple injector heads 121 simultaneously.
In the following description, to set two compressed air supply system 101a and 101b and two injector head 121a
Exemplified by 121b, to describe according to shafting cooling device 100 of the present utility model.
In the illustrated example shown in fig. 2, compressed air supply system 101 may include the first compressed air supply system 101a with
And the second compressed air supply system 101b.Injector head 121 may include the first injector head 121a and the second injector head 121b.First
Compressed air supply system 101a may include the first compressor for preparing compressed air and for storing by the first compressor
First air accumulator of the compressed air of preparation.Second compressed air supply system 101b may include for prepare compressed air
Two compressors and the second air accumulator for storage by the standby compressed air of the second compression mechanism.First injector head 121a can pass through
First air conduit 111a connects with the first air accumulator, for spraying the compressed air from the first air accumulator.Second injector head
121b can be connected by the second air conduit 111b with the second air accumulator, for spraying the compressed air from the second air accumulator.
In embodiment of the present utility model, when the gas-storing capacity in air accumulator (can be obtained by the pressure measxurement of air accumulator
To) reaching first predetermined value constantly, compressor can be automatically stopped, and when the gas-storing capacity (compressed air pressure) in air accumulator reduces
During to second predetermined value, compressor automatically starting, the pressure in air accumulator can be monitored using pressure sensor, to keep
Enough compressed airs are stored in air accumulator, and when the compressed air due to compressor in air accumulator reaches predetermined pressure
And operating is automatically stopped, therefore the stream time of single compressor can be greatly reduced, so as to effectively increase compressor
Service life.
In addition, when using two or more compressed air supply system 101 (for example, 101a, 101b), can
So that two compressor alternations, so as on the one hand ensure the timely supply of compressed air, when avoiding the compressor from breaking down
Cause cooling device to shut down, on the other hand can also reduce the stream time of single compressor, increase single compressor
Service life.
According to exemplary embodiment of the present utility model, as shown in Figures 2 to 4, the first injector head 121a and first is empty
Airway 111a the first injector head of connection 121a one end is fixed on the stationary parts of wind power generating set, the second injector head
121b and the second air conduit 111b the second injector head of connection 121b one end is also secured at the static of wind power generating set
On part.Because the rotating part of moving axis 10 or bearing 20 is the rotary part in wind power generating set, if moving axis will be used for
10 or the cooling device of bearing 20 be attached on the rotating part of moving axis 10 or bearing 20, with using conduction heat transfer to moving axis 10 or
Bearing 20 is cooled down, then cooling device will rotate together with moving axis 10 or bearing 20 so that the arrangement of cooling device with
And cooling medium conveyance conduit is arranged as problem.
According to exemplary embodiment of the present utility model, wind-force will be arranged in for the injector head 121 for spraying compressed air
On the stationary parts of generating set, cooling device can be made to be fixed holding position in the running of wind power generating set, from
And solve the problems, such as to move and combine surely.Preferably, the stationary parts of wind power generating set can be proximate to the brake of moving axis inwall 11
The crossbeam 31 (as shown in Fig. 1 or Fig. 3) of disk 30, brake disc 30, injector head 121 is fixed on the crossbeam 31 of brake disc 30,
Enough spaces can be reserved to generator manhole, are easy to O＆M.Alternatively, injector head 121 can also be fixed on to wind-force hair
On the dead axle 12 of group of motors, and make injector head 121 towards moving axis inwall 11.It is, of course, also possible to consider to keep injector head 121
It is fixed and towards any construction of other of moving axis 10 or moving axis inwall 11.
According to exemplary embodiment of the present utility model, the first injector head 121a and the second injector head 121b point to wind-force hair
In the recess of moving axis 10 in group of motors, and the first injector head 121a and the second injector head 121b can be located at the recess shape
Into interior concave space in (as in Fig. 1 as the part indicated by arrow) so that from the first injector head 121a and the second injector head
The blast injection that 121b is ejected is to the recess, so as to utilize the compression of injection in wind power generating set running
Air cools down to the moving axis 10 and bearing 20 of rotation.Specifically, the moving axis 10 in blast injection to shafting is made, with
Moving axis 10 is cooled down by convection heat transfer' heat-transfer by convection, and then cooling bearing 20 and whole shafting.According to of the present utility model exemplary
Embodiment, the recess for making injector head 121 be pointing directly on moving axis 10, compressed air can be made to be ejected into moving axis with strong pointsly
Recess or other air on 10 are difficult to the dead band flowed freely, as shown in Figure 3.Or injector head 121 can be made directly to refer to
On to moving axis at temperature highest point, the point can be obtained by setting temperature sensor to monitor and determine, with efficient and pin
Moving axis 10 and bearing 20 are cooled down strongly to property.
As shown in Figures 2 to 4, the first air conduit 111a and the second air conduit 111b is respectively from the first air accumulator and
Two air accumulators are drawn, and are arranged along the inwall of tower 5 of wind power generating set, the inwall of base 7, are eventually arrived at and are fixed on close
(as shown in figure 3, illustrate only the part of crossbeam 31 of brake disc 30 in Fig. 3, stopped on the crossbeam 31 of the brake disc 30 of moving axis inwall 11
The crossbeam 31 of hull 30 is the quiet part in wind power generating set, is remained stationary as in wind power generating set running).Although
Two air accumulators are described respectively by the first air conduit 111a and the second respective injector head of air conduit 111b connections, but
An air conduit 111c (as shown in Figure 2) can also be used only, and make single air conduit 111c and the first air accumulator and
The tank connected first end of two gas storage is branched off into two ports, and the second end near the crossbeam 31 for reaching brake disc 30 is branched off into
Two ports, to connect the first injector head 121a and the second injector head 121b respectively.Obviously, air conduit 111c the second end
Can not have branch, so as to only connect injector head a 121a or 121b.
Minor diameter, the pipe of long length can be used by conveying the air common excretory duct 111 (111a, 111b, 111c) of compressed air
Road, being attributed to the air flowed in pipeline has high pressure low speed, and resistance in the duct is smaller, and diameter it is small pipeline it is easy
Fixed in installation, can be achieved to fix by clip or band, the big pipeline of length contributes to the peace for making compressor and air accumulator
Holding position variation.Air conduit 111 is arranged along tower inwall, base inner wall, it is possible thereby to not influence inside tower, machine
The arrangement of other parts in the inside of cabin, can make full use of space.
Compressed air supply system 101 may be disposed at the remote moving axis 10 of wind power generating set and the base 7 of dead axle 12 or
At tower roof panel 6, with utilization space to greatest extent, away from shafting to avoid what power supply arranged from interfering.
As shown in figure 4, the first air conduit 111a one end being fixed on the crossbeam 31 of brake disc 30 is connected to first
Injector head 121a, the first injector head 121a are located at the end of crossbeam 31, and the second air conduit 111b's is fixed on brake disc 30
Crossbeam 31 on one end be connected to the second injector head 121b, the second injector head 121b and be located at the other end of crossbeam 31.
According to Newton's law of cooling, shown in following equation (1)：
Wherein,For differential convection heat transfer' heat-transfer by convection flux, h is convective heat-transfer coefficient, and A is heat exchange area, and T (t) is object temperature,
TenvFor environment temperature, temperature differences of the Δ T (t) between object temperature and environment temperature.Therefore deduce that, raising can be passed through
Convective heat-transfer coefficient h increases convection heat transfer' heat-transfer by convection flux, and so as to improve heat transfer, and convective heat-transfer coefficient h can be by following etc.
Formula (2)-(5) solve：
Wherein, NuLLength is characterized for nusselt number, L, the thermal conductivity factor that k is fluid, Pr is Prandtl number ReLFor Reynolds
Number, the dynamic viscosity that ρ is fluid density, v is the flow velocity of free flow, μ is fluid.It can be obtained by above equation (2)-(4)
Go out following equation (5)：
It can be drawn by equation (5), for giving fluid and radiating object, what k, L, Pr, ρ, μ were to determine, it can obtain
It is directly proportional to the flow velocity v of fluid to go out convective heat-transfer coefficient h, therefore can be improved by changing gas in the flow velocity of the surface of solids
Heat exchange efficiency.
According to exemplary embodiment of the present utility model, in order to maximize cooling effect, make the first injector head 121a and horizontal stroke
31 angled a of beam so that from the first injector head 121a compressed airs sprayed and the direction of motion of moving axis inwall 11 in week
It is substantially opposite on to direction, thus increase relative velocity；Similarly, the second injector head 121b and 31 angled a of crossbeam are made,
So that it is substantially opposite in circumferential direction from the second injector head 121b compressed airs sprayed and the direction of motion of moving axis inwall 11,
Thus relative velocity is increased.By improving speed of the fluid relative to part to be cooled, heat convection efficiency can be significantly improved.
As shown in figure 4, arrow represents the direction of rotation of moving axis 10 (moving axis inwall 11), pressed when by injector head 121a, 121b
When being set according to the mode in Fig. 4, injection direction and the moving axis inwall 11 of the compressed air ejected from injector head 121,121b
Direction of rotation is substantially opposite, now compressed air relative to the flow velocity of moving axis inwall 11 be moving axis inwall 11 rotary speed with
The circumferential component sum of the speed of compressed air jet.As the angle a between injector head 121a, 121b and crossbeam 31 as shown in the figure
For acute angle when, may be such that from injector head 121a, 121b spray compressed air and the direction of motion substantially phase of moving axis inwall 11
Instead, and with angle a reduction, the circumferential component increase of the speed of compressed air jet can be made.In view of it is expected to make injection
Head 121a, 121b are relatively close to moving axis inwall 11, it is preferable that angle a can be between 45 degree to 60 degree, so as to maximize pressure
Cooling effect of the contracting air to moving axis 10.
According to exemplary embodiment of the present utility model, the first injector head 121a and the second injector head 121b can be used such as
Injector head shown in Fig. 5, and nozzle diameter is can be about 5mm, coverage d is about 300mm width, uses this
Kind injector head, can make air-flow equably cover the area of specific width.
In addition, according to exemplary embodiment of the present utility model, the first air conduit 111a and the second air conduit 111b
Connect the first air accumulator and one end of the second air accumulator respectively and can be separately installed with first switch valve and second switch valve, with logical
Cross control first switch valve and second switch valve is turned on and off to supply or be cut to the injections of the first injector head 121a and second
Head 121b compressed air.
In addition, according to exemplary embodiment of the present utility model, shafting cooling device 100 may also include controller, control
Device can be realized by any suitable controller of the prior art.Controller can the temperature control based on bearing 30 first press
Contracting air supply device 101a and the second compressed air supply system 101b operations, so that the first compressed air supply system 101a
It is alternately used for cooling down moving axis 10, and then cooling bearing 20 with the second compressed air supply system 101b.So, can not only
Ensure the timely supply of compressed air, and ensure the air pressure of injection, additionally it is possible to prevent the life-span of compressor from strongly reducing.
Controller can realize the operational control of shaft cooling device 100 by performing step as shown in Figure 6.Specifically
Ground,
Step S1：Before generator 3 opens machine, the first compressor and the second compressor are previously run, makes the first compressor
For compressed air and the compressed air of preparation is set to be separately stored in the first air accumulator and the second air accumulator with the second compression mechanism.
When the first air accumulator and the second air accumulator are filled (pressure in air accumulator reaches predetermined maximum pressure), the first compressor and
Second compressor stops, and the first air accumulator and the second air accumulator thus can be made to store enough compressed airs, think injection air
Prepared so as to cool down moving axis.
After generator 3 to be launched, the operating of generator 3 makes moving axis 10, bearing 20 be constantly be generated heat, so that moving axis
10th, the temperature of bearing 20 constantly raises.
Step S2：Whether the temperature of detection bearing 20 is higher than predetermined temperature threshold (for example, 60 degrees Celsius), can be in moving axis 10
Or the specific location of bearing 20 sets temperature sensor, to detect the temperature of corresponding position.
Step S3：If detecting that the temperature of bearing 20 is higher than the predetermined temperature threshold in step s 2, first is controlled
Switch valve is opened and makes the first compressor operating, the compressed air for being stored in the first air accumulator is provided to the first injector head
121a, to be cooled down by convection heat transfer' heat-transfer by convection to moving axis 10, and then cooling bearing 20.
Step S4：Determine whether the first injector head 121a injecting time is more than scheduled time threshold value (for example, 30 minutes),
Detect whether the pressure in the first air accumulator is less than the first predetermined pressure, and whether the temperature for detecting bearing 20 is higher than the pre- constant temperature
Spend threshold value.
Step S5：If determining that the first injector head 121a injecting time is more than the scheduled time threshold value in step s 4,
Or the first pressure in air accumulator is less than the first predetermined pressure, and the temperature of bearing 20 is higher than the predetermined temperature threshold, then controls
First switch valve processed is closed and controls second switch valve to open, while makes the second compressor operating, makes to be stored in the second air accumulator
Compressed air be provided to the second injector head 121b, to be cooled down to moving axis 10, and then cooling bearing 20, while the first pressure
Contracting machine transfers, to the first air accumulator storing compressed air, to treat that the first air accumulator is filled that (pressure in the first air accumulator is more than the
Two predetermined maximum pressures) when, the first compressor stops.
Step S6：Determine whether the second injector head 121b injecting time is more than the scheduled time threshold value, the storage of detection second
Whether the pressure in gas tank is less than first predetermined pressure, and whether the temperature for detecting bearing 20 is higher than the predetermined temperature threshold
Value.
If it is determined that the second injector head 121b injecting time is more than in the scheduled time threshold value, or the second air accumulator
Pressure is less than first predetermined pressure, and the temperature of bearing 20 is higher than the predetermined temperature threshold, then controls second switch valve to close
Simultaneously return to step S3 is closed, control first switch valve is opened, while makes the first compressor operating, makes the pressure for being stored in the first air accumulator
Contracting air is provided to the first injector head 121a, to be cooled down to moving axis 10, and then cooling bearing 20, while the second compressor
Then to the second air accumulator storing compressed air, treat that the second air accumulator is filled that (it is pre- that the pressure in the second air accumulator is more than second
Determine maximum pressure) when, the second compressor stops.The utility model is sent out wind-force by using by the standby compressed air of compression mechanism
The moving axis of motor is cooled down, and then cooling bearing, and the injector head 121 for being used in injection compressed air is pointing directly at and is formed at
The recess of the moving axis 10 of wind power generating set, can be adequately cooled the recess, and then effectively cool down the He of moving axis 10
Bearing 20.
In addition, according to another embodiment of the present utility model, bearing when controller can be run based on wind power generating set
Jet direction and/or the jet amount of the rotating speed of temperature and/or moving axis and adjust automatically injector head 121.For example, in wind-driven generator
During group operation, when bearing temperature is higher, fully moving axis 10 is carried out by the way that compressor is used alternatingly except above-mentioned
Outside cooling and then cooling bearing 20, controller can also be made higher in response to bearing temperature, and adjust automatically injector head 121
Jet amount makes more compressed air be used to cool down, and the control strategy is stackable into above-mentioned rate-determining steps or to be used alone.
In addition, as described above by improving speed of the fluid relative to part to be cooled, convection current can be significantly improved
Heat exchange efficiency, in another embodiment of the present utility model, rotating speed of the controller based on moving axis 10 can be made, and adjust automatically injector head
121 jet direction and/or jet amount, for example, when the rotating speed of moving axis 10 is relatively low, it can adjust the jet direction of injector head 121
Make velocity component of the compressed air in the circumferential direction of moving axis 10 it is (opposite with the direction of rotation of moving axis inwall 11) increase and/or
Increase the jet amount of injector head 121, so as to strengthen cooling effect.
In addition, by carrying out l-G simulation test according to the shafting cooling device of embodiment of the present utility model, further testing
The cooling effect of shafting cooling device is demonstrate,proved.In simulation process, setting air flow velocity is 10m/s, and moving axis rotating speed is 14rpm/
The angle of s, injector head 121,122 and crossbeam is 60 degree.It can be drawn from simulation result, before cooling, the maximum temperature (axle of shafting
Hold place) it is 362 Kelvins (equivalent to 89 degrees Celsius), after cooling, the maximum temperature (at bearing) of shafting is 354 Kelvin's (phases
When in 81 degrees Celsius), by the injection of compressed air, than reducing 8 degree before cooling after the maximum temperature cooling of shafting.
The utility model cools down by using compressed air to the moving axis of wind-driven generator, and empty using injection compression
The injector head of gas is directly toward the recess for the moving axis for being formed at wind power generating set, can be adequately cooled the recess,
And then effectively cooling bearing part.
In addition, the utility model in the injector head for spraying compressed air in the case of remains stationary, utilize compression
Air is cooled down by convection heat transfer' heat-transfer by convection to the moving axis of rotation, and the moving axis and then cooling settings after cooling are between moving axis and dead axle
Bearing, in the presence of moving axis rotation, compressed air can be made fully and be equably ejected on moving axis, and then make whole bearing
Adequately and uniformly cooled down.
In addition, the utility model by the injector head for spraying compressed air by being arranged on the stationary parts of wind power generating set
Go up and injector head is arranged near the recess of moving axis, make that the installation of shafting cooling device is convenient, saves space, while can be
The abundant and with strong points cooling of moving axis progress to rotation in the case that shafting cooling device remains stationary as, and then can be effective
Ground reduces the temperature of bearing.
Moved in addition, the utility model carries out cooling by turns by using two or more compressed air supply systems
Axle and then cooling bearing, can make preparation compressed air compressor will not continuous working period it is long, so as to greatly increase pressure
The life-span of contracting machine, and then reduce maintenance or change number, while enough compressed airs are stored using air accumulator, it can be ensured that
Even and sufficient compressed air can be used for cooling down shafting.
Although exemplary embodiment has been shown and described, it will be appreciated by those skilled in the art that not departing from
In the case of principle of the present utility model and spirit, these embodiments can be modified, the scope of the utility model is by weighing
Profit requires and its equivalent limits.
Claims (10)
1. a kind of shafting cooling device (100) for wind power generating set, the wind power generating set includes shafting, the axle
System includes moving axis (10), dead axle (12) and the bearing (20) being arranged between the moving axis (10) and dead axle (12), described dynamic
Axle (10) has recess, it is characterised in that the shafting cooling device (100) include more than one injector head (121) with
And the compressed air supply system (101) being connected with the injector head (121), the injector head (121) are fixed on the shafting
Stationary parts on, for the female portion spray compressed air.
2. shafting cooling device (100) as claimed in claim 1, it is characterised in that the wind power generating set also includes stopping
Hull crossbeam (31), the injector head (121) are fixed on the brake disc crossbeam (31) or are fixed on the dead axle (12).
3. shafting cooling device (100) as claimed in claim 1, it is characterised in that the injector head (121) is arranged to make
Obtain the motion side of the direction of motion of the compressed air ejected from the injector head (121) and the inwall (11) of the moving axis (10)
To opposite in circumferential direction.
4. shafting cooling device (100) as claimed in claim 2, it is characterised in that the injector head (121) is fixed on described
The end of crossbeam (31), and the angle formed with the crossbeam (31) is acute angle.
5. shafting cooling device (100) as claimed in claim 1, it is characterised in that the compressed air supply system (101)
Including air compressor, air accumulator and air conduit (111), the air compressor, the air accumulator and the injection
Head (121) is connected by the air conduit (111).
6. shafting cooling device (100) as claimed in claim 5, it is characterised in that the compressed air supply system (101)
It is arranged on the base (7) or tower roof panel (6) of the wind power generating set, the air conduit (111) is from the air
Compressor is drawn, and tower (5) inwall that the wind power generating set is continued on after being connected with the air accumulator is arranged upwards, and
Finally it is connected with the injector head (121).
7. the shafting cooling device (100) as described in claim any one of 1-6, it is characterised in that the compressed air supply
Device (101) is two or more.
8. the shafting cooling device (100) as described in claim any one of 1-6, it is characterised in that the compressed air supply
Device (101) includes the first compressed air supply system (101a) and the second compressed air supply system (101b), and described first
Compressed air supply system (101a) includes the first compressor for preparing compressed air and pressed for storing by described first
First air accumulator of compressed air prepared by contracting machine；Second compressed air supply system (101b) includes being used to prepare compression
Second compressor of air and the second air accumulator for storage by the standby compressed air of second compression mechanism.
9. shafting cooling device (100) as claimed in claim 8, it is characterised in that the shafting cooling device (100) is also wrapped
Include controller, the controller be based on the first compressed air supply system (101a) described in the temperature control of the bearing (20) and
Second compressed air supply system (101b) alternately provides compressed air to the injector head (121).
10. a kind of wind power generating set, the wind-power electricity generation group cools down including shafting as claimed in any one of claims 1-9 wherein
Device (100).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720538479.3U CN206929032U (en) | 2017-05-12 | 2017-05-12 | Shafting cooling device and wind power generating set for wind power generating set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720538479.3U CN206929032U (en) | 2017-05-12 | 2017-05-12 | Shafting cooling device and wind power generating set for wind power generating set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206929032U true CN206929032U (en) | 2018-01-26 |
Family
ID=61352539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720538479.3U Active CN206929032U (en) | 2017-05-12 | 2017-05-12 | Shafting cooling device and wind power generating set for wind power generating set |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206929032U (en) |
-
2017
- 2017-05-12 CN CN201720538479.3U patent/CN206929032U/en active Active
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