CN106505796A

CN106505796A - Electromotor cooling air duct structure

Info

Publication number: CN106505796A
Application number: CN201611127249.4A
Authority: CN
Inventors: 戢平
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-12-09
Filing date: 2016-12-09
Publication date: 2017-03-15

Abstract

A kind of electromotor cooling air duct structure, radially layered bidirectional booster fan forcing functions gas is in generator space internal circulation flow, cooling gas in Li Duanfeng areas are discharged by outer layer fan, become low-pressure area, expellant gas are fan forced by outer layer, be changed into gases at high pressure, Qi Duanfeng areas are reached after being cooled down by heat exchanger, and Shi Gaifeng areas become higher-pressure region；After another part cooling gas are pressurized again by internal layer fan, implement cooling to encouraging end rotor end turn coils, via air gap and continue to flow into Li Duanfeng areas, under differential pressure action between Qi Duanfeng areas and Li Duanfeng areas, cooling gas in Qi Duanfeng areas are entered inside stator winding by vapour end end fresh air inlet, discharged by end end exhaust vent is encouraged, stator winding is cooled down；Cooling gas are cooled down to stator core through stator core air vent；Cooling gas are implemented to vapour end rotor end turn coils after cooling through end ring air vent, via air gap and continue to flow into Li Duanfeng areas；Choke ring plays adjustment ventilation effect, with the cooling gas flow of balanced each ventilating path.

Description

Electromotor cooling air duct structure

Technical field

The present invention relates to a kind of electromotor cooling air duct structure.

Background technology

Along with the development of economic technology, electrical network scale constantly expands, the market demand such as energy-saving, sustainable development, Promote electromotor single-machine capacity constantly to increase, the key issue of steam turbine generator high capacity be by the various electricity in electromotor, The heat energy transmission that magnetic, wind moussing loss are produced is distributed, and otherwise these heat energy are constantly accumulated can cause electromotor inner structure Temperature is constantly raised, so that burning electromotor.

Steam turbine generator synchronous rotational speed is up to 3000r/min, and the centrifugal force suffered by rotor structure is big, by rotor portions such as rotating shafts The restriction of the material strength limit of part, constrains stator of steam turbine generator, the full-size of the section of rotor, circuit, magnetic circuit etc. Depend on cross dimensions increase restrained to meet the condition that capacity increases, make the design system of steam turbine generator high capacity About, the transmission of the heat energy that electricity, magnetic loss are produced is distributed becomes design focus and bottlenecks, in addition steam turbine generator magnetic pole logarithm Few, stator parallel branch number is also few, and rotor is big per pole excitation capacity, this contradiction is more projected, and produces around electricity, magnetic loss the problem of distributing of raw heat energy, on design form, form the various structures type of steam turbine generator, be accompanied by carrying of capacity Height, the structure even more complex that heat energy is distributed.

Content of the invention

It is an object of the invention to provide a kind of electromotor cooling air duct structure, using this electromotor cooling air duct structure Electromotor only with gas as cooling medium can be realized producing the parts such as stator winding (bar), rotor windings, stator core Heat energy transmission is dispersed into generator external, reaches simplified single-machine capacity in 1000MW grades by fruitful radiating effect The radiating auxiliary equipment of the internal structure of steam turbine generator and outside, reduction unit take up an area space, reduce unit cost, simplify machine The operation sequence of group generator operation, the few overhauling project of letter, reduce loss, raising electromotor overall efficiency, extend major overhaul week Phase, maintenance time is reduced, improve the year generating hourage of unit, be that power plant creates economic benefit.Technical solution of the present invention is:By Support urceolus, vapour end end cap, encourage end end cap and jointly seal to form in generator space and be full of refrigerating gas, radially layered is two To force (d) is fan forcing functions gas in generator space internal circulation flow (draft), by encourage end axial air section dividing plate, interior deep bead The cooling gas that stator core is encouraged in the Li Duanfeng areas that end end face is surrounded are discharged by outer layer fan, become low-pressure area, the gas of discharge Body is fan forced by outer layer, is changed into gases at high pressure, through the heat exchanger cup being separated into by interior deep bead, outer deep bead, then passes through Heat exchanger is crossed, heat exchanger rear chamber after being cooled down by heat exchanger, is entered, these cooling gas are most of via encouraging end axial air section dividing plate Reach by vapour end end cap, support outer tube, stator core with the axial ventilation road between support outer tube and support axial ventilation cylinder The Qi Duanfeng areas that vapour end end face is surrounded, and Shi Gaifeng areas become higher-pressure region; Another part cooling gas warp in heat exchanger rear chamber After being pressurized by internal layer fan again by outer deep bead and the reverse air channel that encourages between the end cap of end, via two-way installed in radially layered Force (d) is fan and the connection air duct that encourages between the end ring of end are entered encourages end end ring leeward area (draft), implements cooling to encouraging end rotor end turn coils Afterwards, end ventilation slot is encouraged via rotor, the air gap formed between entrance stator core and rotor simultaneously continues to flow into Li Duanfeng areas Form the cooling circulation to encouraging end rotor end turn coils; End end is encouraged in Qi Duanfeng areas in the vapour end end of stator winding In Li Duanfeng areas, under the differential pressure action between Qi Duanfeng areas and Li Duanfeng areas, the cooling gas in Qi Duanfeng areas are by vapour end End fresh air inlet is entered inside stator winding, is discharged by end end exhaust vent is encouraged, stator winding is cooled down; In Qi Duanfeng areas Under the differential pressure action between Li Duanfeng areas, the cooling gas in Qi Duanfeng areas enter Li Duanfeng areas through stator core air vent, Stator core is cooled down; Cooling gas under differential pressure action between Qi Duanfeng areas and Li Duanfeng areas, in Qi Duanfeng areas Vapour end end ring leeward area is entered through the end ring air vent between vapour end end ring and rotor, cooling is implemented to vapour end rotor end turn coils Afterwards, via rotor vapour end ventilation slot, enter the air gap that formed between stator core and rotor and continue to flow into Li Duanfeng areas, Form the cooling to vapour end rotor end turn coils to circulate; There is ventilation between the choke ring and vapour end end ring of vapour end end Gap, depending on the size of ventilation gap is calculated according to ventilation, plays adjustment ventilation effect, can avoid excessive cooling gas Li Duanfeng areas are entered from Qi Duanfeng areas through air gap by the ventilation gap, to ensure that other ventilating paths have enough cooling gas Body.The technology of the present invention effect:This electromotor cooling air duct structure has the following advantages:The radially layered of 1 cooling air duct of the present invention The pressure head that the internal layer fan blade of bidirectional booster fan and outer layer fan blade are produced is superimposed in machine, pressure head of the total head compared with single stage fan Height, makes cooling gas flowing velocity in machine high, good cooling results; The cooling gas of traditional single stage fan are to be introduced into cooler Fan is entered afterwards, and fan loss increases can cooling gas temperature, reduce cooling effect; And the radial direction of cooling air duct of the present invention (draft) fan of Cooling gas press-in heat exchanger in machine is delivered directly to height after heat exchanger cooling by the outer layer fan blade of layering bidirectional force (d) Ya Feng areas, cooling gas temperature are low, and cooling effect is more preferable; Due to the Li Duanfeng areas of radially layered bidirectional booster fan homonymy being Low-pressure air area, opposite side Qi Duanfeng areas are high-pressure blast area, and stator two ends have enough pressure reduction, possess gas cooling electromotor fixed Working environment needed for sub-line rod, the cooled gas path at the insertion two ends at gas cooling generator stator bar center are directly sudden and violent Generator unit stator two ends are exposed at, and cooling gas are made in the cooling gas at bar center using the gas differential pressure at generator unit stator two ends Passage interior orientation flows, so as to pass heat energy in stator bar; Cooling air duct is the important feature of electromotor, electromotor Cooling air duct structure is determined that by concrete structure cooling requirements such as the stator of electromotor, rotors electromotor cooling air duct structure is again Some requirements being proposed to concrete structures such as the stator of electromotor, rotors and being constrained, rational electromotor cooling air duct structure can be with The radiating requirements of each structure of electromotor are taken into account, and population structure is simple and reliable, make electromotor Distribution of temperature rise reasonable, it is to avoid insulation material Material ageing of performance, efficiency high, dependable performance.Based on above-mentioned advantage, the electromotor of the application present invention can be only with gas conduct Cooling medium, cooling effect can meet or exceed more complicated " gas plus liquid " type of cooling of structure, can apply On the heavy-duty generator of 1000MW capacitance grades, stator bar and stator structure can be made to greatly simplify more in the past:Need not The assembling of stator insulation diversion pipeline is set again, the outer complicated water circulation processing system of machine, water circulation radiating system also need not be set again The facilities such as system, Water quality processing system.There is no the harm such as cooling medium path fouling obstruction, corrosion leakage in stator bar to generate electricity The problem that machine normally runs, can reach the layout of simplified power plant on jumbo electromotor using the technology, reduce building And use cost, energy-saving and emission-reduction, unit reliability is improved, extends the effect in maintenance maintenance cycle.

Description of the drawings

Fig. 1 is cooling air duct general illustration of the present invention

Specific embodiment

As shown in figure 1, by support outer tube 35, vapour end end cap 40, encouraging and holding 24 common closing of end cap to form generator sky In be full of cooling gas, the radially layered bidirectional booster fan Final 16 compel cooling gas in generator space inner recirculation flow Dynamic, the cooling in the Li Duanfeng areas 30 that end end face 31 is surrounded is encouraged by end axial air section dividing plate 28, interior deep bead 22, stator core is encouraged Gas is discharged by outer layer fan 18, becomes low-pressure area, and expellant gas are pressurized by outer layer fan 18, are changed into gases at high pressure, is passed through The heat exchanger cup 20 being separated into by interior deep bead 22, outer deep bead 19, then through heat exchanger 26, cooled down by heat exchanger 26 laggard Enter heat exchanger rear chamber 25, these cooling gas are most of via the axial direction that encourages between end axial air section dividing plate 28 and support outer tube 35 Ventilating duct 29 and support axial ventilation cylinder 32 are reached and are enclosed by vapour end end cap 40, support outer tube 35, stator core vapour end end face 36 Into Qi Duanfeng areas 38, and Shi Gaifeng areas become higher-pressure region；Another part cooling gas in heat exchanger rear chamber 25 are via outer gear After aerofoil 19 and the reverse air channel 21 that encourages between the end cap 24 of end are pressurized again by internal layer fan 17, via double installed in radially layered Enter to force(d) (draft) fan 16 and the connection air duct 15 that encourages between the end ring 14 of end and encourage end end ring leeward area 13, to encouraging end rotor tip line After cooling implemented by circle 12, encourage end ventilation slot 11 via rotor, enter the air gap 8 that formed between stator core 33 and rotor 9 and after The continuous cooling circulation for flowing into Li Duanfeng areas 30, forming to encouraging end rotor end turn coils 12；The vapour end end of stator winding 10 37 in Qi Duanfeng areas 38, encourage end end 27 and are in Li Duanfeng areas 30, between Qi Duanfeng areas 38 and Li Duanfeng areas 30 Under differential pressure action, the cooling gas in Qi Duanfeng areas 38 are entered inside stator winding 10 by vapour end end fresh air inlet 39, by encouraging end End exhaust vent 23 is discharged, and stator winding 10 is cooled down；Differential pressure action between Qi Duanfeng areas 38 and Li Duanfeng areas 30 Under, the cooling gas in Qi Duanfeng areas 38 enter Li Duanfeng areas 30 through stator core air vent 34, stator core 33 are carried out cold But；Under differential pressure action between Qi Duanfeng areas 38 and Li Duanfeng areas 30, the cooling gas in Qi Duanfeng areas 38 are through vapour end end ring End ring air vent 2 between 10 and rotor 9 enters vapour end end ring leeward area 4, vapour end rotor end turn coils 3 is implemented after cooling, Via rotor vapour end ventilation slot 7, enter the air gap 8 that formed between stator core 33 and rotor 9 and continue to flow into and encourage end wind Area 30, forms the cooling to vapour end rotor end turn coils 3 and circulates；Installed in vapour end end 37 choke ring 6 and vapour end end ring 1 it Between there is ventilation gap 5, depending on the size of ventilation gap 5 is calculated according to ventilation, play adjustment ventilation effect, can avoid Many cooling gas enter Li Duanfeng area 30 from Qi Duanfeng areas 38 through air gap 8 by the ventilation gap 5, to ensure other ventilation path There are enough cooling gas in footpath.

The present invention is a kind of electromotor cooling air duct structure, can make to form rational ventilating path in electromotor, make to send out The heat energy that various electricity, magnetic in motor, wind moussing loss are produced is distributed by the cooling gas transmission in machine, it is ensured that electromotor Normal operation.

Claims

1. a kind of electromotor cooling air duct structure, is characterized in that：By support outer tube (35), vapour end end cap (40), encourage end end cap (24) common closing is formed in generator space full of cooling gas, radially layered bidirectional booster fan (16) forcing functions Gas holds axial air section dividing plate (28), interior deep bead (22), stator core to encourage in generator space internal circulation flow by encouraging The cooling gas in Li Duanfeng areas (30) that end end face (31) surrounds are discharged by outer layer fan (18), become low-pressure area, discharge Gas is pressurized by outer layer fan (18), is changed into gases at high pressure, through by changing that interior deep bead (22), outer deep bead (19) are separated into Hot device cup (20), then through heat exchanger (26), after being cooled down by heat exchanger (26), heat exchanger rear chamber (25) is entered, these cooling gas Body is most of via the axial ventilation road (29) and support axle encouraged between end axial air section dividing plate (28) and support outer tube (35) The vapour end wind surrounded by vapour end end cap (40), support outer tube (35), stator core vapour end end face (36) is reached to ventilator (32) Area (38), and Shi Gaifeng areas become higher-pressure region；Another part cooling gas in heat exchanger rear chamber (25) are via outer deep bead (19) after being pressurized by internal layer fan (17) again with the reverse air channel (21) that encourages between end end cap (24), via installed in radial direction point Floor bidirectional booster fan (16) is entered with the connection air duct (15) that encourages between end end ring (14) and encourages end end ring leeward area (13), to encouraging After cooling is implemented at end rotor end turn coils (12), end ventilation slot (11) is encouraged via rotor, enter stator core (33) and rotor (9) Between the air gap (8) continuing that formed flow into Li Duanfeng areas (30), form the cooling to encouraging end rotor end turn coils (12) Circulation；In Qi Duanfeng areas (38) encourage end end (27) and be in Li Duanfeng areas in the vapour end end (37) of stator winding (10) (30) in, the cooling gas under the differential pressure action between Qi Duanfeng areas (38) and Li Duanfeng areas (30), in Qi Duanfeng areas (38) Stator winding (10) inside is entered by vapour end end fresh air inlet (39), is discharged by end end exhaust vent (23) is encouraged, to stator winding (10) cooled down；Under differential pressure action between Qi Duanfeng areas (38) and Li Duanfeng areas (30), cold in Qi Duanfeng areas (38) But gas enters Li Duanfeng areas (30) through stator core air vent (34), and stator core (33) is cooled down；In Qi Duanfeng areas (38), under the differential pressure action and between Li Duanfeng areas (30), the cooling gas in Qi Duanfeng areas (38) through vapour end end ring (10) and turn End ring air vent (2) between sub (9) enters vapour end end ring leeward area (4), implements cooling to vapour end rotor end turn coils (3) Afterwards, via rotor vapour end ventilation slot (7), enter stator core (33) with rotor (9) between formation air gap (8) and continue to flow Li Duanfeng areas (30) is entered, the cooling to vapour end rotor end turn coils (3) is formed and is circulated；Choke installed in vapour end end (37) There is ventilation gap (5) between ring (6) and vapour end end ring (1), depending on the size of ventilation gap (5) is calculated according to ventilation, play Adjustment ventilation effect, can avoid excessive cooling gas from passing through the ventilation gap (5) from Qi Duanfeng areas (38) through air gap (8) Li Duanfeng areas (30) is entered, to ensure that other ventilating paths there are enough cooling gas.