CN101917074B - Large air-cooling steam turbo generator stator capable of improving aeration-cooling effect - Google Patents
Large air-cooling steam turbo generator stator capable of improving aeration-cooling effect Download PDFInfo
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- CN101917074B CN101917074B CN2010102376410A CN201010237641A CN101917074B CN 101917074 B CN101917074 B CN 101917074B CN 2010102376410 A CN2010102376410 A CN 2010102376410A CN 201010237641 A CN201010237641 A CN 201010237641A CN 101917074 B CN101917074 B CN 101917074B
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Abstract
The invention discloses a large air-cooling steam turbo generator stator capable of improving aeration-cooling effect and relates to a large air-cooling steam turbo generator stator. For reducing the maximum temperature rise of an air-cooling steam turbo generator stator bar, the invention adopts the technical points that: an orifice of inner bores of iron core sections which are positioned at the two ends of a stator main body is provided with a chamfer angle (alpha) of between 60 and 75 DEG, the orifice is an axial opening close to one side of an axial midperpendicular plane of the stator main body, and the depth (C) of the chamfer angle is 6 to 12mm. The heat radiating efficiency of a motor cooling system can be effectively improved due to the adoption of the generator stator structure provided by the invention; and under the condition of a given inlet and fixed outlet pressure, when a chamber angle scheme is adopted, experiments prove that the maximum temperature is 3 DEG C lower than that of the conventional scheme after the temperature of the generator stator structure is solved, so the temperature of the hottest section of a motor is effectively reduced, and the whole temperature area of the motor is uniformized.
Description
Technical field
The present invention relates to a kind of large air-cooled turbine generator stator, belong to large air-cooled turbine generator cooling technology field.
Background technology
The raising of turbo generator capacity mainly realizes through the two kinds of approach of linear dimension and increase electromagnetic load that increase generator.Yet in reality, owing to receive the restriction of stator transportation clearance and rotor forging and rotor bow, the increase of turbo generator capacity mainly realizes through increasing electromagnetic load.But increase specific electric load and just increased line bar copper damage simultaneously, the temperature of coil will raise, even surpass rated temperature-rise.For this reason; Must adopt more effective cooling technology, improving its specific heat load, thereby with the temperature rise control of turbo generator each several part in allowed band; Guarantee the operation that it is safe and reliable, so the reasonability of cooling system is the prerequisite of turbo generator to bigger capacity development.Illustrate the 1200MW turbo generator and compare with 100MW, capacity increase to 12 times, its volume only rises to 4.4 times, and radiating surface only rises to 3.5 times, and specific electric load rises to more than 2.5 times.Greatly improve specific heat load if not leaning on, the coil temperature of 1200MW will reach the degree that can't allow.
Summary of the invention
The invention provides a kind of large air-cooled turbine generator stator that improves the ventilation cooling effect, to reduce the maximum temperaturerise of air-cooled turbogenerator stator bars.
The present invention solves the problems of the technologies described above the technical scheme of taking to be: large air-cooled turbine generator stator according to the invention comprises two pressing plates, at least two positioning bars and a plurality of core packet; The contour shape of each core packet is an annular; A plurality of core packets are coaxial to be provided with and to form stator body and said stator body places between two pressing plates; Said at least two positioning bars are distributed on the outer surface of said stator body vertically; Said at least two positioning bars make between every adjacent two core packets and are formed with air gap; Said air gap is that the width of radial ventilation ditch and said radial ventilation ditch is 6mm～8mm, and an end of said at least two positioning bars is all affixed with a pressing plate, and the other end of said at least two positioning bars is all affixed with another pressing plate; The place, aperture that is positioned at the core packet endoporus at stator body both ends is processed with chamfering; Said chamfering is 60 °～75 °; And said aperture is meant that the chamfering degree of depth is 6～12mm near the stator body footpath mouth of middle vertical plane one side (being that said aperture is meant the aperture on the inner end face of each core packet) radially.
The invention has the beneficial effects as follows: adopt generator stator structure proposed by the invention can improve the radiating efficiency of motor cooling system effectively; Under the certain situation of given entrance and exit pressure; After adopting (chamfering) top rake scheme, the flow of two outlets (X1 and X2) of fluid increases to some extent, and the distribution of flow velocity is rationally regional more; Peak flow rate (PFR) when top rake (chamfering) is 75 ° decreases, but generally speaking the flow velocity of stator teeth uprises.Through experiment, after the temperature of generator stator structure proposed by the invention found the solution, can find out that the more original scheme of maximum temperature reduces by 3 ℃, effectively reduced the temperature of the hot arc of motor, make the bulk temperature zone homogenizing of motor.The present invention has carried out structure treatment to stator teeth, makes it adopt this prioritization scheme, when motor is made, can suitably improve the heat load and the power density of motor, and then improves the economic benefit and the fail safe of generator.
Because the large-size machine maximum temperature all appears at stator strand hot blast zone position,, thereby improve the wind speed in the ventilation ducts so the present invention increases the air quantity that gets into hot blast district ventilation ducts through changing hot blast district radial ventilation ditch porch shape.The present invention is keeping under the constant situation of the total discharge quantity of fan of electric motor fan; Suitably reduce maximum temperaturerise place wind ditch along the journey damping loss; Improve the utilance of coolant, thereby the temperature of motor stator top bar is tending towards evenly, reach the purpose that reduces electric machine temperature rise.
Description of drawings
Fig. 1 is that structural front view of the present invention (is suitable for the 200MW air-cooled steam turbine generator aeration structure sketch map of stator according to the invention; 5 is rotor); Fig. 2 is the A portion enlarged drawing (X represents the pressure entrance of air gap, and X1 represents first pressure export of air gap, and X2 represents second pressure export of air gap) of Fig. 1; Fig. 3 is that (X represents the pressure entrance of air gap for the B portion enlarged drawing of Fig. 1; X1 represents first pressure export of air gap, and X2 represents second pressure export of air gap), Fig. 4 is left view (1/66 part of core packet 1 of a core packet 1; 1-1 stator tooth, 1-2 are stator yoke, and n1 representes the upper strata strand, and n2 representes lower floor's strand), Fig. 5 is the front view of adjacent two core packets 1; Fig. 6 a is the aeration structure enlarged drawing of original stator of steam turbine generator, and Fig. 6 b is the aeration structure enlarged drawing (75 ° of chamferings) of stator of steam turbine generator of the present invention, and Fig. 6 c is the aeration structure enlarged drawing (60 ° of chamferings) of stator of steam turbine generator of the present invention; Fig. 7 a be original structure radial ventilation ditch (ventilation ducts is an air gap) velocity flow profile test simulation as a result figure (unit: m/s), Fig. 7 b is radial ventilation ditch of the present invention (ventilation ducts is an air gap) velocity flow profile test simulation figure (75 ° of chamferings as a result; Unit: m/s) figure, 7c is radial ventilation ditch of the present invention (ventilation ducts is an air gap) velocity flow profile test simulation figure (60 ° of chamferings as a result; Unit: m/s); Fig. 8 a is original structure radial temperature profile test simulation figure (unit: ℃) as a result, and 8b is radial temperature profile test simulation of the present invention figure (75 ° of chamferings as a result; Unit: ℃), Fig. 8 c is radial temperature profile test simulation of the present invention figure (60 ° of chamferings as a result; Unit: ℃); Fig. 9 is half axial direction part Simulating Calculation of Temperature Field of 200MW air-cooled steam turbine generator figure as a result.
Embodiment
Embodiment one: shown in Fig. 1～5, Fig. 6 a～6c; The described a kind of large air-cooled turbine generator stator that improves the ventilation cooling effect of this execution mode comprises two pressing plates 3, at least two positioning bars 2 and a plurality of core packets 1; The contour shape of each core packet 1 is an annular; A plurality of core packet 1 is coaxial to be provided with and to form stator body and said stator body places between two pressing plates 3; Said at least two positioning bars 2 are distributed on the outer surface of said stator body vertically, and said at least two positioning bars 2 make between every adjacent two core packets 1 and are formed with air gap 4, and said air gap 4 is that the width W of radial ventilation ditch and said radial ventilation ditch is 6mm～8mm; One end of said at least two positioning bars 2 is all affixed with a pressing plate 3, and the other end of said at least two positioning bars 2 is all affixed with another pressing plate 3; The 1-1 place, aperture that is positioned at core packet 1 endoporus at stator body both ends is processed with chamfering α; Said chamfering α is 60 °～75 °; And said aperture 1-1 is meant that chamfering degree of depth C is 6～12mm near the stator body footpath mouth of middle vertical plane one side (being that said aperture 1-1 is meant the aperture on each core packet 1 inner end face) radially.
Embodiment two: as shown in Figure 1; The said core packet 1 that is positioned at the stator body both ends of this execution mode is meant and is being positioned at ten to 15 core packets 1 at stator body both ends, promptly inwardly all has above-mentioned chamfering on ten～15 core packets 1 of number respectively from stator body two ends outermost end.This 200MW air-cooled steam turbine generator core packet is at axial non-equidistance; Apart from the core packet thickness of end; Therefore the electromagnetic consumable of the every iron leg core generation in end is big than interlude, and under the certain situation of ventilation ducts width, the ability that the ventilation ducts inner fluid is taken away the heat of heater is certain; Cause the iron core temperature of end segments high than interlude; Therefore the present invention in the end 10-15 core packet stator inner circle top rake, to reduce air the flow through eddy current effect and the wind moussing loss at radial ventilation ditch place, increase simultaneously flows to the air mass flow of end ventilation ducts.Other composition and annexation are identical with embodiment one.
Embodiment three: the said chamfering α of this execution mode is 65 °.Other composition and annexation are identical with embodiment one.
Embodiment four: the said chamfering α of this execution mode is 70 °.Other composition and annexation are identical with embodiment one.
Embodiment five: shown in Fig. 1 c, the width W of the said radial ventilation ditch of this execution mode is 7mm.Other composition and annexation are identical with embodiment one.
Further set forth in the face of the technique effect that the present invention reached down:
1, the present invention adopts the full air-cooled steam turbine generator structured data of 200MW, comparative analysis three kinds of schemes, scheme one guarantees that original structure is constant, has set up Simulation Calculation; Scheme two is unshakable in one's determination with 75 ° of angles (chamfering) stator tooth top portion of pruning; Scheme three is unshakable in one's determination with 60 ° of angles (chamfering) stator tooth top portion of pruning.The result shows employing two prioritization schemes, can effectively increase the air quantity that gets into radial ventilation ditch air quantity inlet, reduces along the journey damping loss.Result of calculation is following:
| Project kg/s | Scheme one | Scheme two | Scheme three |
| The pressure entrance flow | 0.07108 | 0.07404 | 0.07381 |
| |
0.01706 | 0.01962 | 0.02064 |
| |
0.05406 | 0.05441 | 0.05317 |
Guaranteeing that inlet pressure is constant, two export under the constant prerequisite of pressure.Shown in the result of calculation of three kinds of structures was as above shown, the flow that can see pressure export increased with the increase of top rake angle, with the cooling that is very beneficial for stator inner structure part.
Fig. 7 a～7c is the velocity profile of radial ventilation ditch axial cross section y direction under three kinds of schemes; Maximum wind velocity radial component when as can be seen from the figure original structure is 60 ° with top rake among the figure is identical; Be 70m/s, and top rake to be 75 ° be that the maximum wind speed radial component of dividing reduces on the contrary, be 60m/s.Can find out from the velocity flow profile of three kinds of schemes; Fig. 7 b scheme flow velocity distributes comparatively even in the top bar position; Though and the original structure maximum wind velocity is high than Fig. 7 b scheme, yet wind speed profile is extremely inhomogeneous, and maximum wind velocity only concentrates on a zone very little apart from notch.
2, Fig. 8 a～8c has provided under three kinds of structures, and the motor stator temperature field distributes.Under the constant prerequisite of each several part loss, the maximum temperature that can see motor is on the strand of the upper strata of stator in guaranteeing motor.Adopt after the top rake structure, the maximum temperaturerise of motor has descended 3 ℃, has effectively reduced the maximum temperaturerise of motor.The maximum temperature of motor is 146.0 ℃ during 75 ° of top rakes, and the maximum temperature of motor is 146.3 ℃ during 60 ° of top rakes.The optimization effect that also can find out scheme 3 from above conclusion is poorer slightly than scheme 2, and the angular dimension of top rake has certain influence to the cooling effect of motor, and the top rake number of degrees are bigger and do not mean that cooling effect is good more.
3, because the symmetry of motor electromagnetic structure and ventilation cooling structure; Large-size machine is when steady operation; Levels strand, layer insulation temperature and stator teeth, yoke portion Temperature Distribution have symmetry too in each teeth groove; So upwards choosing a groove and two and half teeth stator week, thinking that two lateral sections, vertical circumferentially place all are adiabatic face.Obtain the temperature of structural member in the large turbo-type generator stator teeth groove through above-mentioned reasonable assumption, motor ventilation system physical model such as Fig. 4 show that the zone at X place is the fluid mass among the figure; On axial direction, consider generator hot blast district ventilation ducts fluid flow feature, air is divided into two-way after flowing into from pressure entrance, and a transportation work style radially flows, and gets into structural members such as ventilation ducts cooling stator strand, flows out from pressure export 1.Another transportation work style flows along air gap direction, gets into a plurality of ventilation ductss (calculate and do not do consideration) of back, flows out from pressure export 2, and is as shown in Figure 5.
4, Fig. 6 a is the original structure ventilating system enlarged drawing of 200MW air-cooled steam turbine generator, and as can be seen from the figure former aeration structure air gets in the radial ventilation ditch through a right angle from air gap.And Fig. 6 b and Fig. 6 c be with stator core tooth portion footpath aweather the ditch inlet make the top rake with 75 ° of radial direction angles and 60 °, radial height all is 6mm.Behind top rake, the air of core tooth part inlet get into the footpath aweather the flow in the ditch will increase.But can see that from above conclusion though the flow of the first pressure export X1 increases to some extent behind 60 ° of top rakes, the amplitude that increases is very little, and total flow descends on the contrary to some extent.
Embodiment: as shown in Figure 9; According to 200MW air-cooled steam turbine generator accounting temperature field result; Find that the hot arc of motor is distributed in apart from motor shaft center line 1m to the 1.5m position, have 12 ventilation ductss in this interval, adopt this scheme to be optimized; Can corresponding increase the air quantity at these 12 wind ditch places, zone, thereby effectively reduce the maximum temperaturerise of motor.
At each ventilation ducts lamination place, the radial height of pruning 6mm, the triangle of axial length 1.6mm is promptly with radial direction angle (chamfering) 75 degree, like Fig. 6 b.Specific practice is the size that reduces the stator silicon steel punching one by one, because whenever folded silicon steel sheet thickness is 0.5mm, in the size of axial 1.6mm, selects three stator silicon steel laminations for use, and each silicon steel sheet diameter of stator bore reduces 2mm than former stator internal diameter successively and gets final product.What pay particular attention to is that the position of top rake will be the side that air flow is identical, as shown in Figure 1.
Claims (4)
1. large air-cooled turbine generator stator that can improve the ventilation cooling effect; Said large air-cooled turbine generator stator comprises two pressing plates (3), at least two positioning bars (2) and a plurality of core packet (1); The contour shape of each core packet (1) is an annular; A plurality of core packets (1) are coaxial to be provided with and to form stator body and said stator body places between two pressing plates (3); Said at least two positioning bars (2) are distributed on the outer surface of said stator body vertically, and said at least two positioning bars (2) make between every adjacent two core packets (1) and are formed with air gap (4), and said air gap (4) is that the width (W) of radial ventilation ditch and said radial ventilation ditch is 6mm～8mm; One end of said at least two positioning bars (2) is all affixed with a pressing plate (3), and the other end of said at least two positioning bars (2) is all affixed with another pressing plate (3); It is characterized in that: chamfering (α) is located to be processed with in the aperture (1-1) that is positioned at core packet (1) endoporus at stator body both ends; Said chamfering (α) is 60 °～75 °; And said aperture (1-1) is meant that the chamfering degree of depth (C) is 6～12mm near the stator body footpath mouth of middle vertical plane one side radially; The core packet (1) that is positioned at the stator body both ends is meant and is being positioned at ten to 15 core packets (1) at stator body both ends, promptly inwardly all has above-mentioned chamfering on ten～15 core packets (1) of number respectively from stator body two ends outermost end; The position of chamfering will be in a side identical with air flow.
2. a kind of large air-cooled turbine generator stator that improves the ventilation cooling effect according to claim 1, it is characterized in that: said chamfering (α) is 65 °.
3. a kind of large air-cooled turbine generator stator that improves the ventilation cooling effect according to claim 1, it is characterized in that: said chamfering (α) is 70 °.
4. a kind of large air-cooled turbine generator stator that improves the ventilation cooling effect according to claim 1, it is characterized in that: the width of said radial ventilation ditch (W) is 7mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102376410A CN101917074B (en) | 2010-07-27 | 2010-07-27 | Large air-cooling steam turbo generator stator capable of improving aeration-cooling effect |
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| CN2010102376410A CN101917074B (en) | 2010-07-27 | 2010-07-27 | Large air-cooling steam turbo generator stator capable of improving aeration-cooling effect |
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| CN101917074A CN101917074A (en) | 2010-12-15 |
| CN101917074B true CN101917074B (en) | 2012-05-23 |
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| CN112713676B (en) * | 2020-11-17 | 2021-12-10 | 北京交通大学 | Optimization method for ventilation hole of axial variable-section stator of traction motor |
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| JP3816492B2 (en) * | 2004-01-06 | 2006-08-30 | 三菱電機株式会社 | Magnet generator |
| JP2006050712A (en) * | 2004-08-02 | 2006-02-16 | Toshiba Corp | Dynamo-electric machine and cooling method of same |
| CN101056016A (en) * | 2007-05-30 | 2007-10-17 | 哈尔滨理工大学 | Axial radial ventilation system for high-power high voltage solid rotor permanent magnetic electromotor rotor |
| US8053938B2 (en) * | 2007-11-09 | 2011-11-08 | Hamilton Sundstand Corporation | Enhanced motor cooling system |
| CN201352728Y (en) * | 2008-12-29 | 2009-11-25 | 杭州新恒力电机制造有限公司 | Motor stator |
| CN201388115Y (en) * | 2009-02-11 | 2010-01-20 | 哈尔滨理工大学 | Air volume adjusting mechanism of rotor terminal of air-cooled steam turbine generator |
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