CN101183808A - Stator structure of inner cooling type self-circulation vaporization cooling wind power generator - Google Patents
Stator structure of inner cooling type self-circulation vaporization cooling wind power generator Download PDFInfo
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- CN101183808A CN101183808A CNA2007101775553A CN200710177555A CN101183808A CN 101183808 A CN101183808 A CN 101183808A CN A2007101775553 A CNA2007101775553 A CN A2007101775553A CN 200710177555 A CN200710177555 A CN 200710177555A CN 101183808 A CN101183808 A CN 101183808A
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Abstract
The invention discloses a stator structure for an internally-cooling type self-circulation evaporating cooling wind power generator; wherein, a hollow conductor or solid conductor is adopted for the motor stator; a hollow cooling copper bar (311) is added in a groove for the stator; a cooling passage in the hollow stator conductor (or hollow cooling copper bar) and an insulation connector (202), a gas gathering cannular (204), a liquid gathering cannular (201) and an air condenser (206) higher than the stator conductor form a closed cooling passage where cooling medium of liquid evaporating is injected. When the motor runs, heat generated from the motor is transferred to the cooling medium of liquid evaporating which then rises in temperature; when temperature of the medium reaches saturated temperature under corresponding pressure, the cooling medium of liquid evaporating vaporizes for phase transition endothermic, thereby forming gas; the gas of medium descends obliquely and upward along the cooling passage and enters the air condenser 206; heat exchange is conducted in the air condenser 206 with outer natural wind and liquefied after condensed; the gas returns to the hollow conductor of the stator or the cooling passage of the cooling copper bar for next circulation.
Description
Technical field
The present invention relates to the large-scale direct-drive type of a kind of MW class and higher level, half direct-drive aerogenerator stator structure, especially inner-cooled self-loopa evaporative cooling direct-drive type, half direct-drive aerogenerator.
Background technology
Wind power generation is mature technique in the renewable energy utilization, and day by day under the serious situation, wind power generation obtains very big attention in world today's energy crisis, and the wind generating technology development is very fast.Wind power generation is to rotate under the effect of wind-force by wind wheel, and wind energy is changed into the mechanical energy of wind wheel, drives generator for electricity generation.Large-scale direct-drive aerogenerator structural representation as shown in Figure 1, it is mainly by being promoted the impeller 10 that rotation produces power by wind-force, rotor is followed generator body 20 that wheel rotation generates electricity and impeller and generator body are placed in the passive pylon 30 in high-altitude and constitutes.
At present, generally the wind power generation acc power of Cai Yonging has surpassed the MW level, and is maximum to reach more than the 5MW.During the wind-driven generator operation, will produce loss inevitably, mainly contain core loss, winding loss, mechanical loss etc., the final overwhelming majority of these losses becomes heat, and the each several part temperature of motor is raise.Therefore, must effectively cool off motor for the long-term safety operation that guarantees wind-driven generator.The wind-driven generator of operation generally adopts the type of cooling of air blast cooling and liquid cools at present.
Air blast cooling is meant by in wind-driven generator inside fan being set, thereby each parts in the motor is carried out the effect that forced-air blast reaches cooling.Air cooling system is simple in structure, initial cost and operating cost are all lower, be beneficial to and administer and maintain.It is bigger that yet its refrigeration is influenced by temperature, and refrigerating capacity is little, simultaneously, because the cabin will keep ventilating, causes dust storm and moisture to corrode motor component, and machine operation reliability and machine operation life-span are brought adverse effect.In addition, because cooling capacity is lower, generally only be applied to the wind-driven generator of the following power of 750kW.
For the bigger wind-driven generator of power, in order to make the motor operate as normal, a large amount of heats that must in time motor be produced are taken away, and guarantee the normal working temperature of motor, and many at present employing liquid cools modes are cooled off.The basic structure of liquid-cooling system is, main heat generating components (stator, control of conversion device etc.) position at motor, airtight cooling channel is set, make the liquid cooling medium supercooling path that continues to flow with coolant pump, the position absorbs heat to liquid cooling medium in that the motor feels hot, then, flow in the external heat sink heat is shed.Liquid cooling medium is mainly water, and the conductive coefficient of water approximately is 20 times of air, utilizes water as coolant, and cooling effect can improve greatly.Its cooling effect is better than air-cooled greatly.
But the existing cooling means of wind-driven generator has the shortcoming that himself can't overcome:
The i air blast cooling: increased the ventilating system of motor, wind moussing loss is big, and electric efficiency is low; Inhomogeneous cooling is even, because the relation of cooling channel, structure members such as stator core, winding can not evenly be cooled off; Cooling effectiveness is low, makes that the power density of motor reduces, volume weight increases; Noise is big, and the motor airtight performance is poor, is subjected to the erosion of external dust and moisture easily, reduces motor useful life.
The ii liquid cools: wind-driven generator works in overhead on the high pylon of tens meters even rice up to a hundred, will stand minimum subzero 40 ℃ severe cold winter.The medium of liquid cools is mainly water, must add antifreezing agent for preventing water freezing.This antifreeze medium has stronger corrosivity to iron and steel, and therefore, corrosion-resistant stainless steel or other materials must be adopted in the cooling duct of motor, or carries out loaded down with trivial details preservative treatment.The difficulty of processing that these have all increased large-scale wind driven generator has greatly increased cost, in addition, long-time running, because the continuous infiltration of water very easily causes the short circuit of motor stator, the fail safe of wind-driven generator and reliability have been subjected to serious challenge.
Evaporation cooling technique is to utilize the principle of evaporative cooling medium vaporizing liquid heat absorption to come cooling motor, is a kind of type of cooling efficiently, compare with traditional type of cooling big, the required flow of the latent heat of vaporization little, have a narrow range of temperature, cool off evenly comprehensively.Evaporative cooling medium has high-insulativity, do not fire not quick-fried and motor material is not had any corrosiveness, can the motor feels hot position directly be cooled off as motor lead, iron core, and is reliable rapidly, guaranteed the safe operation of motor.Chinese patent 200510086794.9 " a kind of aerogenerator stator " is the stator structure that adopts immersion type evaporative cooling wind-driven generator, be that the motor stator parts all are immersed in the evaporative cooling medium and cool off, this type of cooling comparatively is fit to the less motor of diameter.For the bigger motor of diameter, adopt the immersion type evaporation cooling construction, the reliability of its sealing is with variation, and simultaneously, needing increases motor cost greatly with a large amount of coolants.The stator diameter of direct-drive type, half direct-drive aerogenerator generally all surpasses 2 meters, is not suitable for adopting the immersion type evaporation cooling construction.
Summary of the invention
It is low to the objective of the invention is to overcome traditional air cooling way cooling effectiveness, water-cooling pattern needs antifreeze shortcoming, at large-scale direct-drive type, half direct drive type wind generating, a kind of stator structure of inner cooling type self-circulation vaporization cooling wind power generator that adopts evaporation cooling technique is proposed.The present invention has made full use of self its specific structure characteristic of large-scale wind driven generator, realizes the self-loopa evaporative cooling.
The present invention is by the following technical solutions:
The present invention adopts pipeline inner-cooled evaporation cooling technique, motor stator adopts hollow conductor, or adopt solid conductor and in stator slot, install hollow cooling copper rod additional, its cooling duct and insulating joint, the gas collection endless tube, the liquid collecting endless tube, and the installation site be higher than connect the motor stator lead aerial condenser constitute airtight cooling duct, in the cooling duct, inject the liquid evaporation coolant, during the motor operation, the liquid evaporation coolant is passed in the heating of motor, the liquid evaporation coolant temperature increases, when medium temperature reaches saturation temperature under the corresponding pressure, the liquid evaporation refrigerant vaporizes, decalescence forms gas, oblique upwards the rising enters aerial condenser to dielectric gas along the cooling duct, in aerial condenser, carry out heat exchange with outside natural wind, liquefy after the condensation, come back to the stator hollow conductor, or the cooling duct of hollow cooling copper rod, circulate next time, form the self-loopa of external power-free stator inner-cooled evaporative cooling.
Large-scale wind driven generator is to prevent that blade from bumping with the pylon of its support when rotated, require to guarantee to have enough safe distances between blade and the pylon, 3～5 degree of during design impeller being faced upward, the wind-driven generator fuselage that links to each other with impeller are vertical updip 3～5 degree also, and are preceding low after high.The also preceding high back of hollow conductor in the motor stator slot is low, when evaporative cooling medium in the hollow conductor is heated when becoming gas, because dielectric gas density is less, gas will rise, enter aerial condenser from the motor front end by the gas collection endless tube, be condensed into liquid then and enter hollow conductor formation circulation through the liquid collecting endless tube from motor rear end.The preceding high back of motor is low, and the power of evaporative cooling cooling system self-loopa is provided, and has realized the self-loopa cooling.
The present invention mainly comprises parts such as stator hollow conductor, hollow cooling copper rod, insulating joint, gas collection endless tube, liquid collecting endless tube, aerial condenser, can adopt stator hollow conductor or two kinds of frame modes of hollow cooling copper rod:
1, the frame mode of stator hollow conductor: the stator hollow conductor is copper hollow conductor, and outer cross section is square, and circular hole is opened in the centre, is insulated in the lead outside.According to the motor stator winding designing requirement, the stator hollow conductor evenly is fixed in the stator slot of electric machine stator iron along circumference.The copper cross section of hollow conductor is the current channel cross section, passes through electric current.The hollow conductor hollow section is the cross section, cooling duct, the flow evaporation coolant.The lead two ends according to motor windings wiring requirement, are electrically connected with welding copper cash between the stator hollow conductor in other stator slots, form the motor end.The two ends of hollow conductor have the cooling duct to connect mouth, by insulating joint and the outside sealing cooling duct that forms.During machine operation, the electric current that generator produces produces heat by the hollow conductor in the motor slot, and this heat is taken away by the evaporative cooling medium that flows in the hollow cooling duct of hollow conductor.Thereby the working temperature that guarantees motor remains in the insulation allowed band.In addition, the heat that the magnetic hysteresis loss of electric machine stator iron when machine operation produces also can be realized the part cooling to electric machine iron core by a stator hollow conductor conduction part to evaporative cooling medium.
2, the frame mode of hollow cooling copper rod: the hollow cooling copper rod that the present invention adopts, the cooling of motor when being used for stator employing solid conductor.Its structure is similar with the stator hollow conductor, is copper hollow, and outer cross section is square, and circular hole is opened in the centre.Hollow section is the cross section, cooling duct, the flow evaporation coolant.Two ends have the cooling duct to connect mouth, by insulating joint and the outside sealing cooling duct that forms.Hollow cooling copper rod is installed in the middle of the solid conductor when mounted, and its two sides closely contact by insulating barrier with solid conductor and are beneficial to the heat conduction.During machine operation, the heat that solid conductor produces in the motor slot sees through insulating barrier and conducts to hollow cooling copper rod, takes out of by the evaporative cooling medium phase transformation in the hollow cooling copper rod then.
The insulating joint that the present invention uses is that high-strength insulating material is made, its tail end is connected with gas collection endless tube or liquid collecting endless tube by flexible insulated hose, the cooling duct of welding on its front end and the hollow conductor connects that mouth is airtight to be connected, the coolant guiding channel of every hollow conductor in the motor stator slot is connected with the liquid collecting endless tube with outside gas collection endless tube and seals, realize electric liquid separation.Insulating joint designs different piece-ups according to hollow conductor quantity in the stator slot.
Gas collection endless tube of the present invention is a major diameter steel open circles endless tube, gets φ 100--φ 200mm according to the diameter of its pipeline of size of power of motor, and power is big more, and caliber is thick more.The gas collection endless tube is fixed in the front end of stator core.According to the number of stator hollow conductor, at the relevant position welding point, fixing and sealed insulation flexible pipe is connected by the insulating joint of the flexible insulated hose other end and the cooling duct of every hollow conductor at gas collection endless tube upper edge circumference.Gas collection endless tube top is connected by the air inlet of pipeline with the evaporative cooling aerial condenser, the evaporative cooling medium of the hollow conductor cooling duct in the stator coring groove is subjected to thermogenetic dielectric gas, enter in the gas collection endless tube, rise by the gas collection endless tube, enter the aerial condenser on top, by condenser, heat is spread out of.
Liquid collecting endless tube among the present invention is the hollow endless tube of a steel, and diameter is got φ 50mm, and the liquid collecting endless tube is fixed in the rear end of stator core.According to the number of stator hollow conductor, at the relevant position welding point, fixing and sealed insulation flexible pipe is connected by the insulating joint of the flexible insulated hose other end and the cooling duct of every hollow conductor at liquid collecting endless tube upper edge circumference.Liquid collecting endless tube top is connected by the liquid return hole of pipeline with the evaporative cooling aerial condenser, medium by getting off with the condensation of extraneous air heat-shift in the aerial condenser, dirty along the liquid collecting endless tube, mean allocation is given the stator hollow conductor in each stator slot, carry out next cool cycles, the feed liquor valve is offered in the bottom of liquid collecting endless tube, is used for adding and discharging evaporative cooling medium.
Aerial condenser among the present invention is plate-fin or the fin-tube type condenser that aims at the vapor cooling system design.But mode of air blast cooling is adopted in the secondary cooling of aerial condenser, and this mode can have two approach to realize: one is that outside incorporated fan realizes that this need consume a part of power, increases a part of maintenance workload; Another kind of situation is, under the situation of conditions permit, aerial condenser is positioned over top windward side outside the cabin of generating set, utilizes natural wind to cool off wind regime as secondary.External condition when this makes full use of wind-driven generator work, when promptly external wind was big, the condenser cooling capacity was also bigger, and just in time wind turbine power generation power is also bigger, and the generator caloric value is also bigger.External wind hour, the condenser cooling capacity is less, and just in time wind turbine power generation power is also less, and the generator caloric value is also less.External wind can be fully utilized, and the aerial condenser top is installed the air that vent valve is used to discharge the cooling duct in and reduced evaporative cooling system pressure when breaking down.
The used evaporative cooling medium of the present invention is high insulation, it is not quick-fried not fire, boiling point is suitable, physical and chemical performance is stablized, satisfy the evaporative cooling medium of environmental requirement, as Fla, 4310,3000 etc.Because wind-driven generator is in open-air atmosphere, summer, ambient temperature can reach 45 ℃, wind-driven generator is exposed to the sun down at the sun, self temperature can reach more than 50 ℃, the medium of selecting for use boiling point at normal temperatures is about 70 ℃, can guarantee that like this wind-driven generator evaporative cooling system has stronger cooling capacity.
For air-cooled, the boiling heat transfer coefficient when evaporative cooling medium of the present invention seethes with excitement exceeds several times even tens times than the convection transfer rate of monophasic fluid; For water-cooled, because the strong insulating properties of evaporative cooling medium, heat generating components such as stator winding can pass through evaporative cooling medium internally, and cooling local overheating can not occur evenly, comprehensively, rapidly.Simultaneously, the freezing point of evaporative cooling medium does not have antifreeze problem in winter well below subzero 45 ℃.The self-loopa evaporative cooling can realize non-maintaining operation fully without coolant pump.
Above-mentioned advantage of the present invention makes it in the wind-driven generator field, and particularly large-scale permanent magnet direct-drive formula, half direct-drive aerogenerator field have very broad application prospect.
Description of drawings
Fig. 1 is large-scale direct-drive aerogenerator structural representation, among the figure: 10 impellers, 20 generator bodies, 30 pylons;
Fig. 2 a is the cooling structure schematic diagram of inner-cooled evaporative cooling wind-driven generator, among the figure: 201 liquid collecting endless tubes, 202 insulating joints, 203 hollow conductors, 204 gas collection endless tubes, 205 air inlet pipe, 206 aerial condensers, 207 stator cases, 209 stator cores, 210 liquid back pipes;
Fig. 2 b is the local amplification of hollow conductor joint, among the figure: 204 gas collection endless tubes, 202 insulating joints, 203 hollow conductors, 209 stator cores, 213 cooling passages;
Fig. 3 a stator structure schematic diagram is among the figure: 31 core slots cross sections, 203 hollow conductors, 209 stator cores;
Fig. 3 b stator structure generalized section is the right view of A-A section among Fig. 3 a, among the figure: 31 core slots cross sections;
One of Fig. 3 c stator coring groove sectional view schematic diagram, among the figure: 203 hollow conductors, 213 hollow conductor cooling passages, 313 hollow conductor insulating material, 314 grooves are carved;
Two, 331 hollow cooling copper rods of Fig. 3 d stator coring groove sectional view schematic diagram, 332 hollow cooling copper rod cooling passages, 333 solid conductors, 334 solid conductor insulating material;
Fig. 3 e stator hollow conductor structural representation; 213 hollow conductor cooling passages, 341 cooling ducts connect mouth;
Fig. 4 gas collection endless tube profile, 41 insulating joint interfaces, 42 air inlet pipe interfaces;
Fig. 5 insulating joint structural representation; 51 endless tube interfaces, 52 conductor interfaces;
Fig. 6 motor cooling system grouping schematic diagram.Being divided into three groups among the figure, is a subsystem in each frame of broken lines;
Embodiment
The present invention will be further described below in conjunction with the drawings and specific embodiments.
Fig. 1 is the wind-driven generator structure schematic diagram, and as shown in Figure 1, wind-driven generator mainly is made up of three parts: wind wheel 10, wind-driven generator body 20, pylon 30.Wind-driven generator body 20 is fixed on the pylon 30, and its rotor rotates under the drive of wind wheel 10, and rotor and stator are by electromagnetic induction, and the mechanical energy that rotor is rotated changes electric energy into, from stator winding terminals output current.Because the requirement of mechanical structure between wind-driven generator tower frame 30 and impeller 10 blades, the wind-driven generator impeller 10 3-5 degree of facing upward usually, the 3-5 degree thereby the wind-driven generator body 20 that makes impeller 10 connect is faced upward equally, utilize this design feature, the present invention can realize unpowered self-loopa inner-cooled evaporative cooling.
The present invention mainly comprises parts such as stator hollow conductor 203, hollow cooling copper rod 331, stator core 209, insulating joint 202, gas collection endless tube 204, liquid collecting endless tube 201, air inlet pipe 205, aerial condenser 206.
Fig. 4 is gas collection endless tube 204 generalized sections, and gas collection endless tube 204 is fixed in the stator front end.The diameter basically identical of the diameter of gas collection endless tube 204 and stator core 209 slot part positions, all offer an air inlet pipe interface 42 corresponding to each groove, gas collection endless tube 204 is by hollow conductor 203 inner cooling channels 213 conductings in insulating joint 202 and the stator slot, the endless tube interface 51 of insulating joint 202 is connected with the insulating joint interface 41 of gas collection endless tube 204, the conductor interface 52 of insulating joint 202 connects mouth 341 with the cooling duct of hollow conductor 203 and is connected, form airtight cooling duct, be connected with aerial condenser 206 through air inlet pipe 205 by air inlet pipe interface 42.
Liquid collecting endless tube 201 and gas collection endless tube 204 similar are installed on the motor stator rear end.Its top is connected with aerial condenser 206 through liquid back pipe 210, connecing mouth through insulation joint 202 with cooling duct, hollow conductor 203 rear end in the stator slot then is connected, it act as cooled liquid cooling medium in the aerial condenser 206 is flow back in the cooling duct of hollow conductor 203, circulates next time.
Fig. 5 is the structural representation of insulating joint 202, insulating joint 202 is made by high-strength insulating material, be installed between stator hollow conductor 203 and the gas collection endless tube 204, or be installed between stator hollow conductor 203 and the liquid collecting endless tube, it act as and connects the cooling duct, and the electric current on the stator conductor can not be flow on the gas collection endless tube 204 or liquid collecting endless tube 201 of metal, play the effect of isolating electric current and cooling fluid.The endless tube interface 51 of insulating joint 202 of the present invention is connected with gas collection endless tube 204 or liquid collecting endless tube 201 by flexible insulated hose, the conductor interface 52 of insulating joint 202 connects 341 airtight connections of mouth with cooling duct on the hollow conductor 203, the coolant guiding channel of every hollow conductor 203 in the motor stator slot is connected with liquid collecting endless tube 201 with gas collection endless tube 204 and seals, realize that electric liquid separates.The quantity of insulating joint 202 is decided by hollow conductor quantity in the stator slot.Endless tube interface 51 connects gas collection endless tube 204 (or liquid collecting endless tubes 201) among Fig. 5, and conductor interface 52 connects many stator hollow conductors 203.
The present invention is directed to different stator conductors following two kinds of execution modes arranged:
(1) hollow conductor self-loopa evaporative cooling
Shown in Fig. 2 a, b, aerogenerator stator hollow conductor 203 evenly is fixed in the stator slot of stator core 209 along circumference.Stator hollow conductor 203 is copper hollow conductor, and outer cross section is square, and circular hole is opened at the center, is insulated in the lead outside.Hollow conductor 203 copper parts are current channel, pass through electric current.Hollow conductor 203 central duct are the cooling duct, the flow evaporation coolant.The cooling duct front end of hollow conductor 203 by insulating joint 202 be connected with the gas collection endless tube 204 that is fixed in the motor stator front end, the rear end, cooling duct of hollow conductor 203 is connected with the liquid collecting endless tube 201 that is fixed in the motor stator rear end by insulating joint 202, gas collection endless tube 204 is connected with the aerial condenser 206 that is fixed in stator case 207 tops by air inlet pipe 205, aerial condenser 206 air intake surface face forward, utilize outside natural wind as the secondary coolant, in air setting 206,, realize motor is cooled off to the evaporative cooling medium condensation of gas.Aerial condenser 206 is connected with liquid collecting endless tube 201 by liquid back pipe 210, and each link sealing forms the airtight cooling duct of aerogenerator stator conductor inner-cooled evaporative cooling system thus.In this airtight cooling duct, inject the liquid evaporation coolant from the feed liquor valve of liquid collecting endless tube 201 bottoms, the medium liquid level is as the criterion to fill with liquid collecting endless tube 201 peaks, at this moment, be full of the evaporative cooling liquid medium in the mesopore cooling duct in the motor stator hollow conductor 203.
When the external wind increasing, during wheel rotation, wind-driven generator is started working, and motor stator winding produces electric current, and the output electric energy produces electromagnetic consumable simultaneously, and motor begins heating, and hollow conductor 203 temperature begin rising in the motor slot.Evaporative cooling liquid medium in the middle of the hollow conductor 203 in the cooling duct 213 absorbs the heating of motor, and temperature rises, when its temperature reaches evaporating temperature, continue heat absorption and make the part medium become steam, because gas density is less, these gases will 213 risings along the cooling duct.The 3-5 degree because wind-driven generator is faced upward, the motor stator 3-5 degree that tilts is in the horizontal direction placed, the motor stator front end is than the rear end height, therefore, evaporative cooling medium steam will be along hollow conductor 203 mesopore cooling ducts 213, the oblique gas collection endless tube 204 that upwards enters front end by insulating joint 202, in gas collection endless tube 204, continue upwards then,, enter aerial condenser 206 by air inlet pipe 205, in aerial condenser 206, the heat of evaporative cooling medium gas is taken away by the powerful natural wind in outside, and condensation again becomes liquid, flow down along drain pipe 210, enter the liquid collecting endless tube 201 of motor stator rear end, the insulating joint 202 through the other end enters hollow conductor 203 mesopore cooling ducts 213 from the rear end again, circulates next time, so move in circles, realize the cooling of motor.
This type of cooling is applicable to that power is big, the less wind-driven generator of stator winding circle.
(2) solid conductor self-loopa evaporative cooling
When stator winding adopts solid conductor 333, also can realize the self-loopa evaporative cooling.Its basic principle figure and Fig. 2 are similar, and just the hollow conductor among Fig. 2 is replaced by hollow cooling copper rod.Fig. 3 d is the stator slot sectional view that stator adopts the self-loopa evaporative cooling motor of solid conductor, shown in Fig. 3 d, place the structure and the hollow conductor shown in Fig. 3 e of the middle hollow cooling copper rod 331 of a vertical setting of types of stator slot similar, be copper hollow, circular hole is opened in the centre, central duct is the cooling duct, cooling duct flow evaporation coolant.Be difference owing to capacity motor, the diameter difference of cooling ducts 332 in the middle of the hollow cooling copper rod 331.The solid conductor 333 that constitutes motor windings is closely being arranged on stator slot hollow core cooling copper rod 331 both sides, the outer surface of every solid conductor 333 is enclosed with insulating barrier 334, the wherein one side of solid conductor 333 closely contacts with cooling copper rod 331 by insulating barrier 334, is beneficial to conduct heat.Hollow cooling copper rod 331 constitutes airtight cooling duct by insulating joint 202 and gas collection endless tube 204, liquid collecting endless tube 201, escape pipe, discharging tube, aerial condenser 206 etc., in the cooling duct, charge into the evaporative cooling liquid medium, guarantee to be full of medium in the cooling duct 332 of hollow cooling copper rod.
During machine operation, the heating of motor, heat passes to hollow cooling copper rod 331 by the surface that solid conductor 333 contacts with hollow cooling copper rod 331, the evaporative cooling medium of 332 inside, cooling duct of hollow cooling copper rod, absorb heat, temperature rises, produce evaporative cooling medium gas, gas upwards rises along cooling duct 332 mesopores of hollow cooling copper rod 331 are oblique, enters the gas collection endless tube 204 of motor stator front end, continues in gas collection endless tube 204 upwards then, pass through air inlet pipe, enter aerial condenser 206, in aerial condenser 206, the heat of evaporative cooling medium gas is taken away by the powerful natural wind in outside, again condensation, become liquid, flow down, enter the liquid collecting endless tube 201 of motor stator rear end along drain pipe, enter the cooling duct 332 of hollow cooling copper rod 331 from the rear end again, circulate next time, so move in circles, realize the cooling of motor.
This type of cooling is applicable to the wind-driven generator that stator winding circle is more.
More than the self-loopa evaporative cooling systems that form of two kinds of methods, can both be along with the variation self-control of external environment condition.When external wind was more weak, electric power generation power was less, and it is also less to generate heat, and the coolant evaporation capacity is less, and the condenser condenses ability that needs is also less, and this moment, the condenser condenses ability was also less.When external wind was strong, electric power generation power was bigger, and caloric value is bigger, and the coolant evaporation capacity is bigger, and the condenser condenses ability that needs is also bigger, and increase owing to external wind this moment, and the condenser condenses ability also increases considerably.Made full use of wind energy resources.
More than two kinds of methods, too big at power of motor, when the caloric value of motor was very big, if use single aerial condenser, the volume weight of condenser was very big, was installed in the motor top and can brings some problems.At this moment can be divided into several separate payments to the motor cooling system, the aerial condenser of motor is also corresponding be divided into several, be installed on motor stator shell circumferencial direction be higher than cool off the position of lead, as shown in Figure 6.Be divided into three groups among the figure, every group aerial condenser and its corresponding (dotted line delineation) stator slot inner wire are formed a self-loopa evaporative cooling system, with the difference of said method just separately gas collection endless tube and liquid collecting endless tube no longer be whole ring tube, and only get final product with the arc tube of corresponding length.
Claims (5)
1. stator structure of inner cooling type self-circulation vaporization cooling wind power generator, comprise stator core (209), stator slot, stator conductor, it is characterized in that also comprising gas collection endless tube (204), air inlet pipe (205), liquid collecting endless tube (201), aerial condenser (206); Stator can adopt hollow conductor (203) or solid conductor to add hollow cooling copper rod (202) structure; Hollow conductor (203) is copper hollow conductor, and outer cross section is square, and circular hole is opened at the center, is insulated in the outside; The copper part of hollow conductor (203) is a current channel, and central duct is the cooling duct, cooling duct flow evaporation coolant; Stator core (209) inner headed face is tooth, groove structure, is stator tooth and stator slot alternately along interior round week, and hollow conductor (203) is fixed in the stator slot, carves (314) at stator rabbet by groove and fixes; There is insulating material (313) to be separated by between the hollow conductor (203) and between hollow conductor (203) and the stator core (209); Gas collection endless tube (204) is fixed in the motor stator front end; The diameter of gas collection endless tube (204) is consistent with the diameter of stator core 209 slot part positions, gas collection endless tube (204) is by hollow conductor (203) the inner cooling channel conducting in insulating joint (202) and the stator slot, form airtight cooling duct, be connected with aerial condenser (206) through air inlet pipe (205) by air inlet pipe interface (42); Insulating joint (202) is installed between stator hollow conductor (203) and the gas collection endless tube (204), or is installed between stator hollow conductor (203) and the liquid collecting endless tube (201); The tail end of insulating joint (202) is connected with gas collection endless tube (204) or liquid collecting endless tube (201) by flexible insulated hose, its front end connects with cooling duct on the hollow conductor (203) that mouth is airtight to be connected, and the coolant guiding channel of every hollow conductor (203) in the motor stator slot is connected with liquid collecting endless tube (201) with gas collection endless tube (204) and seals.
2. inner cooling type self-circulation vaporization cooling wind power generator according to claim 1, when it is characterized in that stator conductor adopts hollow conductor, hollow conductor (203) evenly is fixed in the stator slot of stator core (209) along circumference; The cooling duct front end of hollow conductor (203) is connected with the gas collection endless tube (204) that is fixed in the stator front end by insulating joint (202), the rear end, cooling duct of hollow conductor (203) is connected with the liquid collecting endless tube (201) that is fixed in the motor stator rear end by insulating joint (202), gas collection endless tube (204) is connected with the aerial condenser (206) that is fixed in stator case (207) top by air inlet pipe (205), aerial condenser (206) air intake surface face forward, utilize outside natural wind as the secondary coolant, in aerial condenser (206),, realize motor is cooled off to the evaporative cooling medium condensation of gas; Aerial condenser (206) is connected with liquid collecting endless tube (201) by liquid back pipe (210), and each link sealing forms the airtight cooling duct of aerogenerator stator conductor inner-cooled evaporative cooling system thus.
3. inner cooling type self-circulation vaporization cooling wind power generator according to claim 1, when it is characterized in that stator winding adopts solid conductor (333), hollow cooling copper rod (331) places in the middle of the stator slot, solid conductor (333) is closely arranged on stator slot hollow core cooling copper rod (331) both sides, the outer surface of every solid conductor (333) is enclosed with insulating barrier (334), and the one side of solid conductor (333) closely contacts with cooling copper rod (331) by insulating barrier (334); Hollow cooling copper rod (331) is by airtight cooling ducts of formation such as insulating joint (202) and gas collection endless tube (204), liquid collecting endless tube (201), escape pipe, discharging tube, aerial condenser devices (206).
4. according to claims 1 described inner cooling type self-circulation vaporization cooling wind power generator, it is characterized in that aerial condenser (206) is positioned over top windward side outside the cabin of generating set.
5. according to claims 1 described inner cooling type self-circulation vaporization cooling wind power generator, when the motor cooling system that it is characterized in that high-power wind-driven generator is divided into several separate payment, aerial condenser (206) is also corresponding be divided into several; Aerial condenser (206) be installed on motor stator shell circumferencial direction be higher than cool off the position of stator conductor, each aerial condenser (206) and its corresponding stator slot internal stator lead are formed a self-loopa evaporative cooling system.
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