CN103078454B - Heating device and method for assembling rotating shaft of generator by using same - Google Patents
Heating device and method for assembling rotating shaft of generator by using same Download PDFInfo
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- CN103078454B CN103078454B CN201210593278.5A CN201210593278A CN103078454B CN 103078454 B CN103078454 B CN 103078454B CN 201210593278 A CN201210593278 A CN 201210593278A CN 103078454 B CN103078454 B CN 103078454B
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- 238000012546 transfer Methods 0.000 claims description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 239000004519 grease Substances 0.000 claims description 9
- 238000005096 rolling process Methods 0.000 claims description 9
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 239000012774 insulation material Substances 0.000 claims description 3
- 210000003746 feather Anatomy 0.000 claims description 2
- 239000007921 spray Substances 0.000 claims description 2
- 238000001816 cooling Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 230000001050 lubricating effect Effects 0.000 description 7
- 238000009434 installation Methods 0.000 description 5
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- 239000012530 fluid Substances 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
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Abstract
Disclosed are a heating device and a method for assembling a rotating shaft of a generator using the same, the heating device comprising: the heating device comprises a shell, a heating device and a heating device, wherein the shell is provided with an inner cavity, a rotating shaft to be heated is placed in the inner cavity, the small-diameter end of the rotating shaft is placed upwards, and a front bearing is installed in the small-diameter end; the driving motor is arranged at the bottom of the shell; the centrifugal fan is driven by the driving motor and is connected above the driving motor; the electric heat source is arranged above the centrifugal fan and is positioned in the rotating shaft; and the flow guide jet device is arranged at the middle upper part of the cavity and at least positioned outside the small-diameter end of the rotating shaft, and forms a rising channel of hot air with the inner wall of the shell, so that the heated air flows out from the bottom of the rotating shaft, rises along the inner wall of the shell, rushes out from the flow guide jet device and impacts the small-diameter end of the rotating shaft, the small-diameter end of the rotating shaft expands before the front bearing, and the expansion speed of the small-diameter end is greater than that of the front bearing. The invention obviously improves the assembly precision and efficiency of the rotating shaft.
Description
Technical field
The present invention relates to wind-driven generator assembling field.More particularly, the present invention relates to a kind of heater and use the assembly method of alternator shaft of this heater.
Background technology
For large-scale direct-drive permanent magnet wind power generator, between generator unit stator main shaft and alternator shaft, two bearings are installed by interference fit in rear and front end, i.e. fore bearing and rear bearing.Fore bearing between stator main shaft and rotating shaft miner diameter end, near with the impeller hub of Flange joint in rotating shaft; Rear bearing is between stator main shaft and rotating shaft bigger diameter end.Impeller blade is fixed on impeller hub, by driving generator amature between rotating shaft.Generally, fore bearing adopts taper roll bearing (BT bearing), and rear bearing adopts cylinder roller bearing (NT bearing).At present, the assembling for BT bearing and NT bearing generally adopts temperature differential method, realizes the elastic conjunction of bearing.
Assembly method referring to figs. 1 through Fig. 9, BT bearing and NT bearing approximately comprises the steps:
(1) generator unit stator main shaft 1 is vertically fixed on erecting bed, by induction heater, the heating of the inner ring 3 of NT bearing is expanded to the swell increment met the demands, be inserted in stator main shaft 1;
(2) by cooling cabinet by the first outer ring 5 of BT bearing and outer ring 4 cooling meat of NT bearing to the amount of contraction met the demands, be respectively charged into the bearing installed surface of the miner diameter end 202 of alternator shaft 2 and the bearing installed surface of bigger diameter end 201;
(3) rotating shaft 2 of the first outer ring 5 of the outer ring 4 and BT bearing that are provided with NT bearing is enclosed within stator main shaft 1, and makes the outer ring 4 of NT bearing be enclosed within the inner ring 3 of NT bearing;
(4) by heater, the inner ring 6 of BT bearing and the heating of the second outer ring 7 are expanded to the swell increment met the demands, between the miner diameter end 202 successively both being loaded stator main shaft 1 and rotating shaft 2.
So far, the bearing of generator forms an entirety, and when bearing temperature returns to room temperature state, the main shaft of generator forms interference and connects.
The bearing of the electric machine structure of, lighter weight less for rotating shaft yardstick is installed, and this is assembly method easier in temperature differential method assembling.In assembling process, only need carry out heating to some parts of bearing to swell or cooling meat can complete assembling.But for having large scale, the direct wind-driven generator of large quality, need during bearing assemble to adopt large-scale driving lifting and tooling device, and when assembling, due to the outer ring of NJ bearing and retainer with the assembling process of inner ring in there is no visual concrete measure, the outer ring of NT bearing cannot realize accurate aligning with the inner ring of the NT bearing on stator main shaft, rotating shaft is completely by virtue of experience installed on stator main shaft by installation personnel, the shock of inevitably retainer and inner ring in an installation, like this, the all parts of bearing may collide damage, cause significantly reduce the useful life of bearing, improve production cost.In addition, the outer ring of bearing and the gap of inner ring less, may need repeatedly to reinstall, make assemble precision not high, efficiency is not high yet, directly reduces the performance of wind-driven generator, and improves assembly cost.
Therefore, how high accuracy, complete the assembling of bearing efficiently, and the useful life of improving bearing is those skilled in the art's technical issues that need to address.
Summary of the invention
The object of this invention is to provide a kind of heater, to realize expanding process to the heating of alternator shaft and fore bearing.Another object of the present invention is to provide a kind of assembly method using the alternator shaft of this heater, to complete the assembling of alternator shaft efficiently, accurately, and improves the useful life of bearing and the performance of wind-driven generator.
To achieve these goals, the invention provides a kind of heater, described heater comprises:
Housing, has inner chamber, and rotating shaft to be heated is placed in described inner chamber, and the miner diameter end of described rotating shaft is placed upward, and is provided with fore bearing in miner diameter end;
Drive motors, is arranged on the bottom of described housing;
Centrifugal blower, is arranged on the below of rotating shaft, is driven and be connected to above described drive motors by described drive motors;
Electric heat source, is arranged on the top of described centrifugal blower, and it is inner to be positioned at described rotating shaft;
Water conservancy diversion fluidic device, be arranged on the middle and upper part of described cavity, and the miner diameter end being at least positioned at described rotating shaft is outside, form the rising passway of hot-air with the inwall of described housing, after making to be flowed out from the bottom of described rotating shaft by the air that heats, the inwall along described housing rises, and go out in described water conservancy diversion fluidic device, strike the miner diameter end of described rotating shaft, the miner diameter end of described rotating shaft is expanded prior to described fore bearing, and the speed of expansion of miner diameter end is greater than the speed of expansion of described fore bearing.
Preferably, described housing comprises at least inside and outside two-layered steel plates, between described steel plate, be filled with insulation material.
Preferably, described drive motors is in the bottom of described housing at least between two-layered steel plates.
Preferably, described heater also comprises bracing or strutting arrangement, and described rotating shaft is placed on described bracing or strutting arrangement.
Preferably, described bracing or strutting arrangement comprises the supported at three point part of the bottom being arranged on described housing.
Preferably, described heater also comprises stopping means, to limit the relative position of described rotating shaft and described housing.
Preferably, described stopping means comprises and to be arranged on above described bracing or strutting arrangement and the restriction protrusion projected upwards.
Preferably, between the top of described rotating shaft and the top of described housing, surge chamber is provided with.
Preferably, the top of described inner chamber is provided with network, described surge chamber is positioned at the middle position of described network.
Preferably, described water conservancy diversion fluidic device comprises:
Annular baffle, described annular baffle at least to cover from described rotating shaft flange to the part of miner diameter end, to form rising passway with the inwall of described housing; And
Annular jet device, described annular jet device is positioned at the top of described annular baffle, and be centered around the periphery of the miner diameter end of described rotating shaft, and give prominence to towards the miner diameter end of described rotating shaft, to form voltage stabilizing space with the inwall of described housing, sidewall in the face of miner diameter end offers multiple jet, to spray from described jet to make hot-air and strike miner diameter end.
Preferably, described heater also comprises oil-collecting device, and to reclaim bearing grease, the top of described oil-collecting device is suspended on the top of described housing, and lower end touches the inwall of described rotating shaft.
Preferably, described oil-collecting device comprises oil drain pan gradually wealthy from top to bottom and is arranged on the crossbeam on top of described oil drain pan, described crossbeam is placed on the end face of described rotating shaft along the radial direction of described rotating shaft, described oil drain pan is suspended in the miner diameter end of described rotating shaft by described crossbeam, and described oil drain pan feather edge is formed with the crimping with the contact internal walls of miner diameter end.
Preferably, the shape of the bottom surface of described inner chamber is the arc upwards extended, with the bigger diameter end flange enabling the hot-air flowed out from the bottom of described rotating shaft strike described rotating shaft, and described bigger diameter end flange is expanded prior to installed surface in described bigger diameter end, and the speed of expansion of bigger diameter end flange is greater than the speed of expansion of installed surface in described bigger diameter end.
Preferably, at least the inwall of the bigger diameter end of described rotating shaft, the bottom surface of described rotating shaft and be positioned at described rotating shaft miner diameter end fore bearing inwall on be provided with temperature sensor.
Preferably, there is radiation proof thermal shroud in the outer setting of described temperature sensor, to reduce the radiant heat transfer between hot-air.
Preferably, described heater also comprises the heater be arranged between described water conservancy diversion fluidic device and the inwall of described housing, to heat the hot-air flowing through heater.
Preferably, described heater is ring heater.
In addition, the present invention also provides a kind of assembly method of the alternator shaft adopting above-mentioned heater to carry out, and comprises the steps:
A, rear bearing is assembled on described stator main shaft;
B, fore bearing is assembled in the miner diameter end of described rotating shaft;
C, described rotating shaft and the fore bearing be arranged in the miner diameter end of described rotating shaft lifted in described heater and carries out heating expansion process;
D, after the swell increment of described rotating shaft and described fore bearing meets the demands, by described rotating shaft and described fore bearing hot jacket on stator main shaft and rear bearing.
Preferably, steps A comprises:
A1, by the inner ring of described rear bearing and rolling element hot jacket on described stator main shaft;
A2, the outer ring of described rear bearing and retainer to be set on the inner ring of described rear bearing.
Preferably, step B comprises:
B1, the first outer ring cold of described fore bearing is loaded in the miner diameter end of described rotating shaft;
B2, the inner ring of described fore bearing and rolling element are loaded in the first outer ring of described fore bearing;
B3, the second outer ring cold of described fore bearing to be loaded in the miner diameter end of described rotating shaft.
When utilizing heater countershaft provided by the present invention and the fore bearing be arranged in the miner diameter end of described rotating shaft to carry out heating expansion process, electric heat source is first utilized to be heated by the air in rotating shaft; Under the pressure of centrifugal blower drives, to be entered into the space between rotating shaft and housing from the bottom of rotating shaft by the air that heats, and along housing spiral inner wall be rapidly to upper flowing, then enter water conservancy diversion fluidic device; Under the effect of its water conservancy diversion, arrive the top of inner chamber, go out rotatably from described water conservancy diversion fluidic device, and strike the miner diameter end outer wall of described rotating shaft; Occur consumingly after jet impingement heat transfer at hot-air and described miner diameter end, under the pressure suction effect of described centrifugal blower, it is inner again to enter described rotating shaft, and flows downward, and is again heated by electric heat source, thus form continuous print closed circulation heating system.
Heater provided by the present invention adopts jet current principle; in the collision process of the miner diameter end of hot-air and rotating shaft; there is strong impact jet flow heat transfer; after this convective heat transfer is carried out with the fore bearing being positioned at miner diameter end again; the miner diameter end of rotating shaft can be swollen prior to fore bearing; and the speed of expansion of miner diameter end is greater than the speed of expansion of fore bearing, thus relieve the expansion constraint of miner diameter end to fore bearing and outer ring, and protect lubricating grease from the direct impact of hot-fluid.
In addition, the assembly method of rotating shaft provided by the present invention, in visual situation, first rear bearing is assembled to stator main shaft, avoid the retainer of rear bearing and the shock of inner ring, reduce the damage of rear bearing, significantly improve installation accuracy and the useful life of rear bearing; And when described rotating shaft being carry fore bearing cover and installing on stator main shaft, because rotating shaft and fore bearing have been expanded to predetermined amount, easily can will complete assembling, and the shock avoided between fore bearing and stator main shaft, improve useful life and the installation accuracy of fore bearing equally, need not repeatedly install, and then contribute to improving efficiency of assembling, reduce assembly cost, and improve the transaction capabilities of wind-driven generator.
Accompanying drawing explanation
When present invention is described by reference to the accompanying drawings below, above and other advantage and disadvantage of the present invention will become clearer and be easier to understand, wherein:
Fig. 1 is the structural representation of stator main shaft of the prior art;
Fig. 2 is the view that the inner ring of rear bearing of the prior art is assembled to stator main shaft;
Fig. 3 is the structural representation of rotating shaft of the prior art;
Fig. 4 is the view of the bigger diameter end in prior art, the outer ring cold of rear bearing being loaded on rotating shaft;
Fig. 5 is the view be loaded on by the first outer ring cold of fore bearing in prior art in the miner diameter end of rotating shaft;
Fig. 6 is by the view of shaft set to stator main shaft in prior art;
Fig. 7 be in prior art by the inner ring hot charging of fore bearing in the view of stator main shaft;
Fig. 8 is the view be loaded on by the second outer ring cold of fore bearing in prior art in the miner diameter end of rotating shaft;
Fig. 9 is the view after rotating shaft of the prior art is assembled to stator main shaft;
Figure 10 is the structural representation of heater according to an embodiment of the invention;
Figure 11 is the structural representation of the temperature sensor of the heater shown in Figure 10;
Figure 12 is the FB(flow block) of rotating shaft assembly method according to an embodiment of the invention;
Figure 13 is view rear bearing being assembled to stator main shaft shown in Figure 12;
Figure 14 is the view be loaded on by the first outer ring cold of fore bearing in the miner diameter end of rotating shaft shown in Figure 12;
Figure 15 is the view be assemblied in by the inner ring of fore bearing in the miner diameter end of rotating shaft shown in Figure 12;
Figure 16 is the view be loaded on by the second outer ring cold of fore bearing in the miner diameter end of rotating shaft shown in Figure 12;
Figure 17 is the view after the fore bearing shown in Figure 12 is assembled to the miner diameter end of rotating shaft;
Rotating shaft shown in Figure 17 and fore bearing are placed into the view that heater carries out heating expansion process by Figure 18;
Figure 19 be by the heating expansion process shown in Figure 18 after rotating shaft and fore bearing hot charging in the view of stator main shaft;
Figure 20 is the view after the rotating shaft shown in Figure 19 and fore bearing are assembled to stator main shaft.
Embodiment
Core of the present invention is to provide a kind of heater, realizes expanding process to the heating of alternator shaft and fore bearing.Another core of the present invention is to provide a kind of assembly method using the alternator shaft of this heater, completes the assembling of alternator shaft efficiently, accurately, and improves the useful life of bearing and the performance of wind-driven generator.
In order to enable those skilled in the art better understand the present invention, below by describing the present invention in conjunction with the accompanying drawings and embodiments, wherein, identical label represents same parts all the time.
With reference to the structural representation that Figure 10, Figure 10 are heaters according to an embodiment of the invention.
According to one embodiment of present invention, provide a kind of heater, described heater comprises housing 8, centrifugal blower 13, electric heat source 10 and water conservancy diversion fluidic device.
Housing 8 can comprise dismountable upper shell and lower house, is combined between upper shell and lower house by teeth groove type faying face, forms the inner chamber 801 of sealing, and can also arrange insulation material 11 at faying face place, to reduce the loss of heat.Housing 801 can be formed by least two-layered steel plates, and between the interlayer of steel plate fill insulant material 21.The rotating shaft 2 of generator to be heated is placed in inner chamber 801 vertically, and the miner diameter end 201 of rotating shaft 2 upward, and bigger diameter end 202, is provided with fore bearing 20 down in miner diameter end 201.
The drive motors 12 of centrifugal blower 13 is arranged on the bottom of housing 8, particularly can between the steel plate of the bottom of housing 8; Like this, the vertical distance between the horizontal steel plate bottom can increasing, to hold drive motors 12, can also arrange multiple ribs vertically, to strengthen the intensity bottom housing 8 between horizontal steel plate.
Centrifugal blower 13 is arranged on the top of drive motors 12, and is connected with the rotation axis of drive motors 12, can rotate under the driving of drive motors 12, centrifugal blower 13 is also positioned at the below of rotating shaft 2.During blade High Rotation Speed on centrifugal blower 13, around it, negative pressure is formed on (bottom of rotating shaft 2), can force the flowing of the air driven in inner chamber 801.
Heater can also comprise bracing or strutting arrangement, and bracing or strutting arrangement is arranged in inner chamber 801, with supporting revolving shaft 2.Certainly, bracing or strutting arrangement can not affect the normal circulation of air in inner chamber 801.Bracing or strutting arrangement can be supported at three point part 14 particularly, and strutting piece 14 is arranged on the bottom of inner chamber 801, is uniformly distributed in circumference, and the bigger diameter end flange 203 of rotating shaft 2 is directly placed on strutting piece 14.
In addition, heater can also comprise stopping means, stopping means is arranged in inner chamber 801, so that when housing 8 is put in rotating shaft 2, the position of countershaft 2 limits, make rotating shaft 2 approximately be positioned at the middle position of inner chamber 801, and ensure the space that exists all the time between the outer wall and the inwall of housing 8 of rotating shaft 2 for air circulation.This stopping means for being distributed in the restriction protrusion projected upwards on bracing or strutting arrangement, such as, can be distributed in the vertical projection 15 on strutting piece 14, that is, circumferentially can be evenly distributed with three vertical projections 15.
Electric heat source 10 is arranged on the top of centrifugal blower 13, and electric heat source 10 is positioned at the inside of rotating shaft 2, with the air heat by flowing through rotating shaft 2 inside.The outer wall of electric heat source 10 can offer circular hole equably, offer square hole again after spaced apart, aperture and pitch-row can regularly distribute, to increase the radiant heat transfer between electric heat source 10 and air.In addition, the heat pipe in electric heat source 10 can adopt " M " type heat pipe, can also adopt the fin for increasing heat transfer area.Certainly, electric heat source 10 provided by the present invention is not limited to this, far-infrared heating element can also be adopted to substitute above-mentioned electrothermal tube, also can adopt other forms of heat pipe, as long as can realize preheating of air rapidly.Like this, the air in rotating shaft 2, after being heated by electric heat source 10, owing to flowing out from the bottom of rotating shaft 2 under the pressure suction driving of centrifugal blower 13, and is rapidly to flowing spirally; In the process that hot-air rises, at least there is convective heat transfer with rotating shaft 2; Hot-air, behind the top arriving inner chamber 801, again enters into again the inside of rotating shaft 2, is again heated by electric heat source 10 from the top of rotating shaft 2, form circulating-heating loop, closed ground.
Water conservancy diversion fluidic device is arranged on the middle and upper part of inner chamber 801, and the miner diameter end 201 that this water conservancy diversion fluidic device is at least positioned at rotating shaft 2 is outside.Annular space between the inwall of water conservancy diversion fluidic device and housing 8 is the circulation passage in the uphill process of hot-air, during to make hot-air near the miner diameter end 201 substantially rising to rotating shaft 2 spirally, can directly strike miner diameter end 201, form strong impact jet flow heat transfer effect, improve the rate of heat transfer of hot-air and miner diameter end 201, ensure that miner diameter end 201 expands prior to the fore bearing 20 in miner diameter end 201, and the speed of expansion of miner diameter end 201 is greater than the speed of expansion of fore bearing 20, then hot-air skims over the inner ring of fore bearing 20 from bottom to up fast, enter the inside of rotating shaft 2.
Specifically, water conservancy diversion fluidic device can comprise annular baffle 901 and annular jet device 902.Annular baffle 901 is roughly tubular, at least covers the part from the middle part (such as, middle flange 204) of rotating shaft 2 to miner diameter end 201, that is, between the inwall of housing 8 and the middle and upper part of rotating shaft 2 divide.Annular baffle 901 bottom can be arranged on flange 204, and be arranged in the inner side of the installing hole on flange 204, to reduce the hot-air entered between annular baffle 901 and rotating shaft 2 as much as possible, most hot-air is upwards flowed through the passage between annular baffle 901 and the inwall of housing 8.Annular jet device 902 is positioned at the top of annular baffle 901, and the outside of miner diameter end 201 around rotating shaft 2, that is, between the inwall and miner diameter end 201 of housing 8.Annular jet device 902 is given prominence to towards miner diameter end 201, certain voltage stabilizing space 903 is formed with the inwall of housing 8, in addition, the upper end of annular jet device 902 can be connected to the top of inner chamber 801, and offers multiple jet on the sidewall of miner diameter end 201 faced by annular jet device 902.Like this, can there is accumulation to a certain degree in hot-air after rising to voltage stabilizing space, and supercharging, and then go out from jet at high speed, and strike the outer wall of miner diameter end 201, and there is strong impact jet flow between miner diameter end 201 and conduct heat, promptly miner diameter end 201 is heated; Thereafter heat air continues the top flowing to rotating shaft 2, under the pressure suction effect of centrifugal blower 13, flow downward, at this moment, convective heat transfer is there is again in hot-air with the fore bearing 20 being arranged on miner diameter end 201 inside, thus achieve miner diameter end 201 and can expand prior to fore bearing 20, and the speed of expansion of miner diameter end 201 is greater than the speed of expansion of fore bearing 20.
It should be noted that, water conservancy diversion fluidic device provided by the present invention is not limited to above-mentioned form, the water conservancy diversion fluidic device of other versions can also be adopted, as long as can ensure that miner diameter end 201 can expand prior to fore bearing 20, and the speed of expansion of miner diameter end 201 is greater than the speed of expansion of fore bearing 20.Such as, can also at the inside packing material of water conservancy diversion ejector 902, and offer multiple injection channel equably, and the size of injection channel answers convergent along the flow direction of hot-air, this contributes to the speed improving hot-air further to a certain extent, make it go out at high speed, and strike miner diameter end 201.
In addition, heater provided by the present invention also comprises heater 16, and this heater 16 is arranged between water conservancy diversion fluidic device and housing 8, to carry out post bake to the hot-air risen spirally, improves the temperature difference between hot-air and rotating shaft 2 further.
Specifically, heater 16 can be ring heater, is centered around the outside of annular baffle 901.
In addition, in order to the pressure of the hot-air above steady flow to rotating shaft 2, reduce turbulence intensity, surge chamber 24 can be formed between the top of rotating shaft 2 and the top of housing 8, this surge chamber 24 is a part for inner chamber 801, and this contributes to strengthening the convective heat transfer between hot-air and fore bearing 20 to a certain extent.Network 17 can also be provided with at the top of inner chamber 801, to improve the intensity of housing 8, be reduced in the distortion in lifting upper shell process.And surge chamber 24 can be formed in the middle position of network 17.Like this, hot-air, after conducting heat with miner diameter end 201, enters surge chamber 24, and after surge chamber 24 voltage stabilizing, again flows back to the inside of rotating shaft 2.
In the process that countershaft 2 and fore bearing 20 heat, the lubricating grease in fore bearing 20 likely there will be the phenomenon of drippage, and for this reason, heater provided by the present invention can comprise oil-collecting device further, to receive the lubricating grease of drippage, realizes the recovery of lubricating grease.The top of oil-collecting device is suspended on the top of housing or the top of rotating shaft 2, and lower end touches the inwall of rotating shaft 2, that is, substantially can form the box body of opening upwards together with the inwall of rotating shaft 2.
Specifically, the top being suspended on rotating shaft 2 at above-mentioned oil-collecting device is, oil-collecting device can comprise oil drain pan 18 and crossbeam 19.Oil drain pan 18 adopts gradually wealthy version from top to bottom, and crossbeam 19 is arranged on the top of oil drain pan 18.Crossbeam 19 is placed on the top of rotating shaft 2, that is, the length of crossbeam 19 is greater than the diameter on the top of rotating shaft 2; Oil drain pan 18 is suspended on the inside of the miner diameter end 201 of rotating shaft 2, and the lower end of oil drain pan 18 is formed with outside crimping, and with the contact internal walls of rotating shaft 2.
According to another embodiment of the present invention, the shape of the bottom of heater provided by the present invention can for the arc projected upwards, like this, after bottom from the hot-air heated by electric heat source 10 from rotating shaft 2 is gone out, under the bump effect of the bottom surface of arc, bigger diameter end 202 and the bigger diameter end flange 203 of rotating shaft 2 can be struck, make hot-air and between bigger diameter end 202 and bigger diameter end flange 203, strong jet impingement heat transfer occurs, ensure that bigger diameter end flange 203 expands prior to installed surface in bigger diameter end 202 (for installing rear bearing), and the speed of expansion of bigger diameter end flange 203 is greater than the speed of expansion of the interior installed surface of bigger diameter end 202.
In addition, need to monitor in real time the temperature of the temperature in inner chamber 801 and rotating shaft 2 in heating process, can at least in the bigger diameter end 202 of rotating shaft 2 on installed surface, mounting temperature sensor 25 on the bottom of rotating shaft 202 and the inner surface of fore bearing 20.Temperature sensor 25 should be provided with radiation proof thermal shroud 27, as shown in figure 11, on the impact of the certainty of measurement of temperature sensor 25, the temperature of each measured surface of rotating shaft 2 can be reacted to avoid hot-air around as much as possible accurately.Also should do high temperature resistant and radiation proof protection to the lead-in wire 26 of temperature sensor 25 simultaneously.
When utilizing heater countershaft 2 provided by the present invention and the fore bearing 20 be arranged in the miner diameter end 201 of rotating shaft 2 to heat, first rotating shaft 2 being hung on the lower house of housing 8, then upper shell is lifted on lower house, form the inner chamber 801 of sealing; Utilize the electric heat source 10 being positioned at rotating shaft 2 inside by the air heat of rotating shaft 2 inside; Under the pressure driving effect of centrifugal blower 13, gone out through the bottom of rotating shaft 2 from the inside of rotating shaft 2 by the air heated; Under the bump effect of the bottom surface of arc, heating bigger diameter end flange 203 and bigger diameter end 202; Hot-air rises rapidly more spirally, in the circular passage between annular baffle 901 and housing 8, reaches in annular jet device, and goes out from annular jet device high speed, strikes on the miner diameter end 201 of rotating shaft 2 general horizontal, heating miner diameter end 201; Thereafter heat air flows upwards, in surge chamber 24, flow into the inside of rotating shaft 2 again from surge chamber 24 after voltage stabilizing, with fore bearing 20, convective heat transfer occurs, heated by fore bearing 20 in the process flowed downward; Finally heated by electric heat source 10 again.
After the various piece of rotating shaft 2 is expanded to by heating the degree met the demands, heating-stopping apparatus, then by rotating shaft 2 and fore bearing 20 hot jacket on stator main shaft, complete turning of countershaft 2 and join.
With reference to Figure 12 to Figure 20, according to another embodiment of the present invention, the present invention also provides a kind of assembly method of the alternator shaft adopting above-mentioned heater to carry out, and described assembly method comprises the steps:
(S1), rear bearing 23 is assembled on stator main shaft 1.
Specifically, step (S1) can comprise:
(S1-1) by the inner ring 3 of rear bearing 23 and rolling element hot jacket on stator main shaft 1;
Induction heater or hot air can be adopted to heat inner ring 3 and rolling element, make inner ring 3 and rolling element be expanded to the size met the demands.
(S1-2) outer ring 4 of rear bearing 23 and retainer are set on the inner ring 3 of rear bearing 23.
Before suit, lubricating grease can be smeared in outer ring 4 and retainer.
(S2), fore bearing 20 is assembled in the miner diameter end 201 of rotating shaft 2.
Specifically, when fore bearing 20 is double-row conical bearings, step (S2) can comprise:
(S2-1), by the first outer ring 5 cold charge of fore bearing 20 in the miner diameter end 201 of rotating shaft 2;
Cooling cabinet can be adopted to carry out cooling processing to the first outer ring 5.
(S2-2), the inner ring 6 of fore bearing 20 and rolling element are loaded in the first outer ring 5 of fore bearing 20;
Before assembling inner ring 6, lubricating grease can be applied in inner ring 6 and rolling element, to reduce wearing and tearing during fore bearing 20 operation.
(S2-3), by the second outer ring 7 cold charge of fore bearing 20 in the miner diameter end 201 of rotating shaft 2.
Cooling cabinet can be adopted to carry out cooling processing to the second outer ring 7, after predetermined amount of contraction to be achieved, attach it in miner diameter end 201, itself and inner ring 6 be cooperatively interacted, finally completes the assembling of fore bearing 20.
In addition, the retainer of fore bearing 20 loads in miner diameter end 201 together with outer ring.
(S3), rotating shaft 2 and fore bearing 20 are lifted in heater carry out heating expansion process.
Hanging in process, first the upper shell of heater will removed, then rotating shaft 2 is hung in, then upper shell is lifted on lower house, rotating shaft 2 is being sealed in inner chamber 801 and carries out heat treated.
(S4), after the swell increment of rotating shaft 2 and fore bearing 20 meets the requirement of interference fit, by the rotating shaft 2 after expanding and fore bearing 20 hot jacket on stator main shaft 1 and rear bearing 23.
When assembling, guide 22 can be set on the top of stator main shaft 1, lead with the installation of countershaft 2, being equivalent to the length extending stator main shaft 1.When rotating shaft 2 is coupled to stator main shaft 1 completely, at this moment, the rear bearing 23 be arranged in advance on stator main shaft 1 is mounted in the bigger diameter end of rotating shaft 2, then is disassembled by guide 22.
Heater provided by the present invention adopts jet current principle, in the collision process of hot-air with the miner diameter end 201 of rotating shaft 2, strong impact jet flow occurs and conducts heat, the miner diameter end 201 of rotating shaft 2 is swollen prior to fore bearing 20; And the speed of expansion of miner diameter end 2 is greater than the speed of expansion of fore bearing 20, thus relieve the expansion constraint of the outer ring of fore bearing 20, and protect lubricating grease from the direct impact of hot-fluid.
In addition, the assembly method of rotating shaft provided by the present invention, in visual situation, first rear bearing 23 is assembled to stator main shaft 1, avoid the retainer of rear bearing and the shock of inner ring, and ensure that the inner ring 3 of rear bearing 23 and the assembly precision of outer ring 4, improve the useful life of efficiency of assembling and rear bearing 23; And when rotating shaft 2 carrier fore bearing 20 cover is installed on stator main shaft 1, because fore bearing 20 and rotating shaft 2 have been expanded to the amount meeting matching requirements, easily can complete assembling, significantly reduce the phenomenons such as the collision between the inner ring 6 of fore bearing 20 and outer ring, retainer, also without the need to carrying out this suits many, significantly improve assembly precision and efficiency, reduce assembly cost, and contribute to improving the useful life of fore bearing 20 and the performance of wind-driven generator.
Above to heater provided by the present invention and use the assembly method of the alternator shaft of this heater to be described in detail; although show and describe some embodiments of the present invention; but those skilled in the art should understand that; when not departing from by the principle of the present invention of claim and its scope of equivalents thereof and spirit; can to modify to these embodiments and perfect, these amendments and improve also should in protection scope of the present invention.
Claims (20)
1. a heater, for heating alternator shaft, described rotating shaft comprises miner diameter end and bigger diameter end, it is characterized in that, comprising:
Housing, has inner chamber, and rotating shaft to be heated is placed in described inner chamber, and the miner diameter end of described rotating shaft is placed upward, and is provided with fore bearing in miner diameter end;
Drive motors, is arranged on the bottom of housing;
Centrifugal blower, is arranged on the below of rotating shaft, is driven and be connected to above drive motors by drive motors;
Electric heat source, is arranged on the top of described centrifugal blower, and it is inner to be positioned at described rotating shaft;
Water conservancy diversion fluidic device, be arranged on the middle and upper part of described cavity, the rising passway of hot-air is formed with the inwall of described housing, after making to be flowed out from the bottom of described rotating shaft by the air that heats, inwall along described housing rises, and goes out in described water conservancy diversion fluidic device, directly strikes the miner diameter end of described rotating shaft, to make the miner diameter end of described rotating shaft expand prior to described fore bearing, and the speed of expansion of miner diameter end is greater than the speed of expansion of described fore bearing.
2. heater according to claim 1, is characterized in that, described housing comprises at least inside and outside two-layered steel plates, between described steel plate, be filled with insulation material.
3. heater according to claim 2, is characterized in that, the drive motors of described centrifugal blower in the bottom of described housing at least between two-layered steel plates.
4. heater according to claim 1, is characterized in that, described heater also comprises bracing or strutting arrangement, and described rotating shaft is placed on described bracing or strutting arrangement.
5. heater according to claim 4, is characterized in that, described bracing or strutting arrangement comprises the supported at three point part of the bottom being arranged on described housing.
6. heater according to claim 4, is characterized in that, described heater also comprises stopping means, to limit the relative position of described rotating shaft and described housing.
7. heater according to claim 6, is characterized in that, described stopping means comprises and to be arranged on above described bracing or strutting arrangement and the restriction protrusion projected upwards.
8. heater according to claim 1, is characterized in that, between the top of described rotating shaft and the top of described housing, form surge chamber.
9. heater according to claim 8, is characterized in that, the top of described inner chamber is provided with network, and described surge chamber is positioned at the middle position of described network.
10. the heater according to claim 1 to 9 any one, is characterized in that, described water conservancy diversion fluidic device comprises:
Annular baffle, described annular baffle at least covers the part from the middle part of described rotating shaft to miner diameter end, to form described rising passway with the inwall of described housing; And
Annular jet device, described annular jet device is on described annular baffle, and be centered around the periphery of the miner diameter end of described rotating shaft, and give prominence to towards the miner diameter end of described rotating shaft, to form voltage stabilizing space with the inwall of described housing, sidewall in the face of miner diameter end offers multiple jet, to spray from described jet to make hot-air and strike miner diameter end.
11. heaters according to claim 1 to 9 any one, it is characterized in that, described heater also comprises oil-collecting device, to reclaim bearing grease, the top of described oil-collecting device is suspended on the top of described housing or the top of described rotating shaft, and lower end touches the inwall of described rotating shaft.
12. heaters according to claim 11, it is characterized in that, described oil-collecting device comprises oil drain pan gradually wealthy from top to bottom and is arranged on the crossbeam on top of described oil drain pan, when the top of described oil-collecting device is suspended on the top of described rotating shaft, described crossbeam is placed on the end face of described rotating shaft along the radial direction of described rotating shaft, described oil drain pan is suspended in the miner diameter end of described rotating shaft by described crossbeam, the contact internal walls of described oil drain pan feather edge and miner diameter end.
13. heaters according to claim 1 to 9 any one, it is characterized in that, described rotating shaft comprises the bigger diameter end flange being formed in bigger diameter end place, the edge of the bottom surface of described inner chamber forms the arc upwards extended, with the bigger diameter end flange enabling the hot-air flowed out from the bottom of described rotating shaft strike described rotating shaft, and described bigger diameter end flange is expanded prior to installed surface in described bigger diameter end, and the speed of expansion of bigger diameter end flange is greater than the speed of expansion of installed surface in described bigger diameter end.
14. heaters according to claim 1 to 9 any one, is characterized in that, at least the inwall of the bigger diameter end of described rotating shaft, the bottom surface of described rotating shaft and be positioned at described rotating shaft miner diameter end fore bearing inwall on be provided with temperature sensor.
15. heaters according to claim 14, is characterized in that, have thermal shroud in the outer setting of described temperature sensor, to reduce the radiant heat transfer between temperature sensor and hot-air.
16. heaters according to claim 1 to 9 any one, it is characterized in that, described heater also comprises the heater be arranged between described water conservancy diversion fluidic device and the inwall of described housing, to heat the hot-air flowing through heater.
17. heaters according to claim 16, is characterized in that, described heater is ring heater.
The assembly method of 18. 1 kinds of alternator shafts adopting the heater as described in claim 1 to 17 any one to carry out, is characterized in that, comprise the steps:
A, rear bearing is assembled on stator main shaft;
B, fore bearing is assembled in the miner diameter end of described rotating shaft;
C, described rotating shaft and the fore bearing be arranged in the miner diameter end of described rotating shaft lifted in described heater and carries out heating expansion process;
D, after the swell increment of described rotating shaft and described fore bearing meets the demands, by described rotating shaft and described fore bearing hot jacket on stator main shaft and rear bearing.
19. assembly methods according to claim 18, it is characterized in that, steps A comprises:
A1, by the inner ring of described rear bearing and rolling element hot jacket on described stator main shaft;
A2, the outer ring of described rear bearing and retainer to be set on the inner ring of described rear bearing.
20. assembly methods according to claim 18, is characterized in that, when described fore bearing is double-row conical bearing, step B comprises:
B1, the first outer ring cold of described fore bearing is loaded in the miner diameter end of described rotating shaft;
B2, the inner ring of described fore bearing and rolling element are loaded in the first outer ring of described fore bearing;
B3, the second outer ring cold of described fore bearing to be loaded in the miner diameter end of described rotating shaft.
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| CN201210593278.5A CN103078454B (en) | 2012-12-31 | 2012-12-31 | Heating device and method for assembling rotating shaft of generator by using same |
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| CN201210593278.5A CN103078454B (en) | 2012-12-31 | 2012-12-31 | Heating device and method for assembling rotating shaft of generator by using same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104410216B (en) * | 2014-12-02 | 2017-01-04 | 哈尔滨电机厂有限责任公司 | Heavy whole Transporting electromotor general assembly method in factory |
| CN106300816A (en) * | 2015-05-18 | 2017-01-04 | 中核核电运行管理有限公司 | Flywheel heater is used in main pump motor maintenance |
| CN112806862B (en) * | 2021-02-07 | 2021-11-23 | 珠海格力新材料有限公司 | Hot air frying pan |
| CN113489267A (en) * | 2021-06-30 | 2021-10-08 | 哈尔滨电气动力装备有限公司 | Large synchronous motor rotor axial thrust mounting process |
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| US5441242A (en) * | 1992-12-04 | 1995-08-15 | Ebner Industrieofenbau Gesellschaft M.B.H. | Apparatus for contacting surfaces of workpieces with a flowing gas |
| CN201774430U (en) * | 2010-07-29 | 2011-03-23 | 中山大洋电机制造有限公司 | Novel motor mechanism |
| CN201918851U (en) * | 2010-12-25 | 2011-08-03 | 常州市神力电机有限公司 | Shaft penetrating tooling and shaft penetrating hydraulic machine for iron core of wind power motor stator |
| CN201971859U (en) * | 2010-12-27 | 2011-09-14 | 苏州新长光热能科技有限公司 | Efficient air circulation flow guiding device applicable to thermal treatment furnaces |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4490891B2 (en) * | 2005-09-15 | 2010-06-30 | 本田技研工業株式会社 | Manufacturing method of electric motor |
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| US5441242A (en) * | 1992-12-04 | 1995-08-15 | Ebner Industrieofenbau Gesellschaft M.B.H. | Apparatus for contacting surfaces of workpieces with a flowing gas |
| CN201774430U (en) * | 2010-07-29 | 2011-03-23 | 中山大洋电机制造有限公司 | Novel motor mechanism |
| CN201918851U (en) * | 2010-12-25 | 2011-08-03 | 常州市神力电机有限公司 | Shaft penetrating tooling and shaft penetrating hydraulic machine for iron core of wind power motor stator |
| CN201971859U (en) * | 2010-12-27 | 2011-09-14 | 苏州新长光热能科技有限公司 | Efficient air circulation flow guiding device applicable to thermal treatment furnaces |
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