CN104810997A

CN104810997A - Permanent magnet direct-drive wind-powered generator system and sealing coordinating drying control method thereof

Info

Publication number: CN104810997A
Application number: CN201510178522.5A
Authority: CN
Inventors: 马盛骏; 辛乳江
Original assignee: Xinjiang Goldwind Science and Technology Co Ltd
Current assignee: Jinfeng Technology Co ltd
Priority date: 2015-04-15
Filing date: 2015-04-15
Publication date: 2015-07-29
Anticipated expiration: 2035-04-15
Also published as: KR20160123207A; KR101724895B1; CN104810997B

Abstract

The invention provides a permanent magnet direct-drive wind-powered generator system and a sealing coordinating drying control method thereof. The system comprises a wind-powered generator and a converter, wherein the converter comprises a rectifying unit, a DC busbar and an inverting unit; the inverting unit is connected with a power grid; a power supply switch is arranged on a first transmission line between the rectifying unit and the wind-powered generator; a permanent magnet direct-drive wind-powered generator comprises a stator, a rotor, an air source system, a net side reversing power supply switch, a switch controller and a jet sealing device; the switch control is connected with the air source system, the power supply switch and the net side reversing power supply switch and used for controlling the on and off of the power supply switch and the net side reversing power supply switch as well as controlling the start and stop of the air source system. According to the system, the airflow generated by the air source system, the heat generated by the wind-powered generator around a stator winding and the heat generated by reversing power supply can be comprehensively controlled and utilized, so as to achieve sealing coordinating drying of the wind-powered generator.

Description

Permanent magnet direct-driving aerogenerator system and the collaborative drying control method of sealing thereof

Technical field

The present invention relates to permanent magnet direct-driving aerogenerator system and the collaborative drying control method of sealing thereof, belong to technical field of wind power generation.

Background technology

Open type permanent magnet direct-drive external rotor wind driven electric generator in prior art, rely on natural air cooled, opening structure is beneficial to natural draft heat exchange, help magnetic pole use permanent magnetic material prevent temperature rise from exceeding standard after magnetic reduce, but generator is exposed to exceedingly odious environment (being exposed to wind, frost, rain, snow, sand and dust, salt fog etc.) condition usually to be descended.

1, the source of motor internal moisture content and harm thereof in wet environment

(1) source of moisture content

Wet environment compared with normal environment, rain, snow more easily enter motor internal, and the source being summed up moisture content mainly contains following several:

The wind-driven generator of the nacelle exterior of outdoor operation, be directly subject to drenching with rain the dipping after melting with snow-broth, and a small amount of moisture content is rotated by motor and enters motor internal from annular gap; In wet weather after generator quits work, moisture enters generator and then condensation; The generator of long-time stoppage in transit condenses because moisture enters moisture-sensitive; The wind-driven generator worked in adverse circumstances also may suffer the accidents (osculum blocking) such as sleet water soaking to cause moisture content to enter; Moisture content in the insulation pore that preliminary drying or dipping lacquer post-drying thoroughly do not cause is not carried out by technological requirement remaining etc. in generator production process.

(2) the generator insulating reason of easily making moist

This part is mainly quoted paper " analysis of causes that generator insulating easily makes moist " and is described (author: QiYu good fortune QI Yu-fu prints name: heavy motor technology year, volume (phase): 2009 (4)).

Air-cooled type generator insulate and easily makes moist under shut down condition, is mainly manifested in that leakage current significantly increases, insulation resistance significantly reduces.According to the rules, insulation resistance is low to certain numerical value, is do not allow to run, must carries out drying process.

It is running status due to it and structures shape that air-cooled type generator insulating easily makes moist.Because the insulation of generator can only adopt solid dielectric insulation, embed in core slots, can not soak as transformer in insulating oil, can not as fully closed combined electric unit GIS, be sealed in and be full of in the closed metal shell of SF6, the insulation of generator can only expose in atmosphere.In normal course of operation, the heat that generator core, winding produce will lean on the air of flowing to take away.When generator heat production and heat radiation reach balance, generator core, winding temperature remain within certain numerical value scope.When generator normally runs, rely on natural air cooled external rotor permanent magnet directly to drive generator and also rely on the air invaded from nature to serve as coolant.Unshakable in one's determination, winding temperature can be higher than the temperature of coolant air, after generator is stopped transport, unshakable in one's determination, winding temperature reduces gradually, due to the effect that air in space, air gap expands with heat and contract with cold, enters a large amount of air to reach pressure balance in generator.At this moment insulation absorbs the moisture in air and makes moist, if at thunderstorm season, after rain, air humidity is larger, and generator insulating makes moist just even more serious.After generator insulating makes moist, leakage current is tens times of normal value even hundred times, and insulation resistance is 1/tens of normal value.From data analysis, generator insulating makes moist very serious, without drying process, can not run.Generator insulating makes moist seriously, is the test data angle from insulation.In fact, humidified insulation initial stage, just adsorption moisture, insulating inner does not also make moist, and compared with being subject to after water logging with insulation, the moisture of insulating surface or trace, drying is got up also much easier.

The insulation of motor, when air humidity is very large, is made moist and is caused the reduction of insulation resistance to require a very short time, one day even several hours.This sky of will praying for rain must resist rainwater and enters in generator or taken away by humid air in motor in time after rain.Code has explicit stipulation: insulation resistance is defective can not be ensured generator operation accidents happened, just in case have an accident, certainly will cause very large economic loss.Have to pass through dry process qualified after could run.

(3) there is the harm that moisture content causes in generator

For generator, good insulation is the precondition that motor safety runs, no matter the skin of slot liner, layer insulation, phase insulation or binding strap and power outlet in the stator windings, there is a large amount of pores, be easy to absorb the moisture in air, reduce the insulation property of self and insulating heat-conductive is deteriorated, cause insulation breakdown and then damage motor, causing the person, device security accident.Relative humidity height easily makes the solidifying attached water film in surface, humidity higher than more than 95% time, motor internal often condenses water droplet, make metalwork easy-to-rust, lubricating grease becomes damp and rotten, expansion that what insulating material had make moist, feeling like jelly of having is clamminess, and machinery and electric property worsen, and easily insulation breakdown and dielectric surface flashover occur.In addition, under high humidity environment, mould also easily grows, and the secretion energy corroding metal of mould and insulating material, insulation is worsened rapidly, causes short circuit accident.

2, the Macro or mass analysis of prior art

(1) common in prior art drying mode

This part is with reference to paper " the field drying process that stator winding insulation in generator is made moist " (author: Lin Jun, Li Yunhai, strong and vigorous, [middle figure classification number] TM31l [Document code] B[article number] 1004-7913 (2009) 04-0013-02) and in content be described.

After generator unit stator winding makes moist, for the generator that the different type of cooling, different capabilities and damp degree are different, carrying out, the drying process time method that adopts is also different, at present on-the-spot conventional following several drying means.(a) stator iron loss seasoning.In fact this method does not have operability to the generator overhauled in high-rating generator especially running.(b) impressed current seasoning.Electric current is passed into, the heat heating rotor windings utilizing copper loss to produce to rotor coil.By on-the-spot capacity limit, be difficult to adopt interchange heating means, therefore generally adopt direct current heating.Generator three-phase windings need be connected by the method, also according to circumstances branch can be untied and be connected into a loop again.High-rating generator current ratio is comparatively large, generally adds direct current by winding strands.Power supply can adopt the power supply of electric barring or other power supply got by rectification, and the generator of low capacity also can adopt the method for multiple stage DC welding machine parallel operation.(c) external heat source method.In generator wind-tunnel, stator upper and lower part deep bead is opened, at stator winding lower disposed electric hot plate or other infra red heating device.The generator of the method to small volume is more effective.(d) three-phase shortcircuit seasoning.By generator unit stator winding exit three-phase shortcircuit, then make generating set operate in nominal speed range, by regulating exciting current, the heat making stator winding current increase thereupon, utilize generator self electric current to produce, carries out drying to winding.Three-phase shortcircuit drying needs generator itself to possess operating condition.(e) hot water circuit seasoning.The generator of stator bar internal water cooling, the heater in inner cold water case or interim access electric heater can be utilized the cooling water heating in inner cold water case, and water temperature higher than 70 DEG C, should not start inner cold water pump, with the insulation of the dry stator bar of hot water circuit.Stator bar water-cooled generator scene adopts the method more, and the object acted on is the motor of Ground Operation.

For permanent magnet direct-driving aerogenerator in order to the scheme (b) in dry insulation system above method on probation.

(2) other dry technologies

Paper " with hot-air removal moisture drying maintenance after halt turbines "

Author: Chen Hanggeng, Cao Zuqing; Authors' working unit: Southeast China University Nanjing; Parent document: the 4th national thermal power generating technology Annual Conference collection of thesis (first volume).

Meeting title: the 4th national thermal power generating technology Annual Conference, the time of meeting: on November 01st, 2003.

Utilize unsaturated humid air to flow through flow passage component after halt turbines, absorb residual moisture, make machine inner drying, after preventing halt turbines, corrosion occurs.For improving the wettability power of humid air, heated by heater again after first humid air being compressed, and then discharge after passing into steam turbine absorption moisture." water capacity that is vented oneself be down to desired indicator, then to show in machine drying, can corrosion be prevented.

(3) paper " quickly drying method of damaged or destroyed by flood motor "

Author: Shen Zhaohu, periodical name: Chinese countryside water conservancy and hydropower year, volume (phase): 1999 (1).

Need drying by the motor after immersion in water, for shortening drying time, saving dry funds, have developed a kind of far infrared temperature control baker.This baker is simple, efficient, practical, draw materials easily, cost is low.

3, open type cabin outer fan power generator encapsulation scheme technology path is explored

Sealing can be divided into the static seal between geo-stationary faying face and the large class of the movable sealing two between relative motion faying face.Here, there is relative motion at the sealing position of open type cabin outer fan power generator, belongs to rotary seal.Whether the parts doing relative motion according to seal and its contact, and movable sealing can be divided into contact seal and non-contacting seal and without shaft seal.For open type cabin outer fan power generator according to contact seal, at non-rain, the air-flow of relatively dry in the drying time of snow period, just cannot be relied on to carry out long-term directly cooling to motor internal.Non-contacting seal has labyrinth seal and dynamic seal.Labyrinth seal is that the throttle effect limit utilizing fluid in gap is leaked, and leakage rate is comparatively large, is usually used in less demanding occasion.Dynamic seal has centrifugal seal, floating-ring seal, helixseal, pressurized seal, injection sealing, hydraulic seal, magnetic current sealing etc., produce pressure by dynamical element to offset the pressure differential of sealing both sides to overcome leakage, it has very high sealing, but energy consumption is large.This kind of sealing utilizes hydromechanical poised state and works.If operating condition changes, the fluctuation that leakage rate is very large will be caused.

Labyrinth seal also claims labyrinth seal, is mainly used in air seal.The passage that it can make fluid form through many throttle clearance and expansion cavity, produce very large energy loss through repeatedly throttling, fluid pressure greatly declines.Directly driving in external rotor large scale permanent-magnetic wind driven generator and can construct sealing part by " choke pressure drop " this feature.

Pressurized seal utilizes air pressure to block the gap between rotating parts and stationary parts, to ensure sealing.But have the gas source feed of certain pressure, the pressure that source of the gas produces in this sealing place is more higher than the outer natural environmental stress of motor.Pressurized seal does not limit by temperature, speed, is generally used for the place that sealing both sides pressure reduction is little.

Based on the relevant representative paper retrieved above, at present, operate in the thermal power generation unit in electrical network, hydro-generating Unit, nuclear power generating sets to be usually arranged in a fixing factory building.Usually, can not through suffering the intrusion of rain, snow in factory building.Just Hydropower Unit is when standing the flooding of flood, the coolant (water) that above-mentioned generating set adopts is when occurring to reveal, and the convenience of the service conditions maintenance of the generating set of ground handling is better than the land or offshore wind turbine of wind energy turbine set operation all far away.Generator cooling aspect, while the air-cooled facility made full use of in natural environment and superior performance condition, what need to solve and will stand severe tests is the insulation level of the insulation system of generator.Permanent magnet direct-drive external rotor wind driven electric generator is exposed to wind throughout the year, sand, rain, snow, the sun are exposed to the sun or among refrigerated environment after shutting down; too large with the environment gap residing for the turbo generator of ground handling, gas turbine generator, hydraulic generator; especially the repair cost had is too high, and work high above the ground (60-100 rice) crane uses needs expense great number to pay.So even just become impossible in the work easily carried out on the ground to wind-driven generator.On the other hand, the operation in wind turbine generator has also depended on wind weather.Wind turbine drive electrical generators rotor turns, generator unit stator induces electromotive force, just can implement three-phase shortcircuit at stator outlet, relies on short circuit current heat production to carry out dry stator, improves insulation level.Also need basis wind speed size at that time, implement to become oar and indirectly control generator amature rotating speed, and then control short circuit current, tide is dried in controlled winding heat production, and these conditions all depend on weather simultaneously.Moreover the lasting length of wind affects dries damp effect, directly drive outer rotor permanent-magnet wind-driven generator quality large, heat production requirement is very big, after heat production, heat conduction time transmits drying time with the quality of driving the time of tide is all some hourage magnitudes, and the continuation time length of wind, discontinuity all affect dries damp effect.

Inventor finds that in practical operation prior art exists following defect:

(1) permanent magnet direct-drive external rotor wind driven electric generator uses natural wind to remove cooling stator core support and rotor outer wall, wind in the natural environment of simultaneously some invades machine cavity through generator stator rotor gap, flow to the other end vertically by air gap again to assemble, after deposition, light air is extruded from back-end sealing and is entered air.What flow through motor internal space is gas (vapour), liquid, solid multiphase flow (wherein having air, steam, rain, snow, salt fog, sand and dust, floccule etc.).They can cause insulation property to worsen, and cause electrical machine insulation electric property, degraded in mechanical properties, and residue withstand voltage level and life-span reduce, and finally cause the destruction of insulating.

(2) be all terrestrial power generation unit operation more than, in the work high above the ground of 60-100 rice, comprise and realize various function, especially service work is carried out in cabin, usual manpower and materials institute can not and, it is impossible even to become.Wind-driven generator sealing, drying step and safeguard that (maintenance, change) differs greatly with the thermal power generation of ground handling, hydroelectric generator operation difficulty.Some ground use good method for the wind turbine generator at high dry running but inconvenience carry out, be even difficult to be suitable for.

(3) separately rely on above-mentioned logical air drying methods to be dry tack free technology, can't resolve stator core internal laminations interlayer make moist after dry demand.

(4) adopt open type structure to be that the air in the weather that accompanies each other or the weather that a snowstorm is raging that can not resist the elements carries the harm that rain or snow invade generator, " insulation level reductions " has paid cost for generator cools.

(5), after shutting down, in generator cavity, in air gap, wet air condensation infiltrates motor, and can cause motor stator, permanent magnetism magnetic pole surface coating makes moist, and can affect their useful life.

Summary of the invention

The object of the embodiment of the present invention is to provide a kind of permanent magnet direct-driving aerogenerator system and the collaborative drying control method of sealing thereof, and it is collaborative dry that the heat that the heat relying on stator winding to produce during to realize the air-flow, the wind turbine power generation that utilize air supply system to produce and the time of falling power transmission produce realizes sealing.

For achieving the above object, The embodiment provides a kind of permanent magnet direct-driving aerogenerator system, comprise wind-driven generator and current transformer, described current transformer comprises rectification unit, DC master row and inversion unit, described inversion unit is connected with electrical network, the first transmission line between described rectification unit and described wind-driven generator is provided with power-cutting switch, and described permanent magnet direct-driving aerogenerator comprises stators and rotators

Also comprise air supply system, power-cutting switch, on-off controller and jet flow sealing device are fallen in net side, wherein,

Described stator comprises stator support, is arranged on the stator core of the periphery wall of stator support, oar side tooth support and oar gusset plate, described oar side tooth support is arranged on the oar side axial end of described stator core, and the rotor mated with described stator has rotary piston sealing ring;

The periphery wall of described stator support has at least one first pore, described oar side tooth support offers at least one second pore;

Described stator also comprises at least one gas channel of the first pore described in UNICOM and described second pore, and described gas channel is through the inside of described stator core;

Described air supply system and described first pore UNICOM;

Described jet flow sealing device and described second pore UNICOM, for by the air-flow from described second pore to both direction drainage, make the annulus that wherein oar gusset plate described in one air flow direction and described rotary piston sealing ring are formed, the air gap described in another strand of air flow direction between stator and described rotor;

Between described DC master row and described wind-driven generator, have the second transmission line, described net side is fallen power-cutting switch and is arranged on described second transmission line;

Described on-off controller and described air supply system, power-cutting switch and net side and fall power-cutting switch and be connected, fall the unlatching of power-cutting switch and disconnection for controlling described power-cutting switch and described net side, and the startup of described air supply system and closedown.

Further, permanent magnet direct-driving aerogenerator system also comprises and is arranged near the insulation of described wind power generation trough portion and/or the humidity sensor of core lamination gap location, and described humidity sensor is connected with described on-off controller,

Described on-off controller, for:

Wind energy turbine set be calm or be less than incision wind speed state under, the humidity value that humidity sensor detects is judged, if humidity exceedes predetermined humidity threshold, then disconnect described power-cutting switch and open described net side and fall power-cutting switch, and start described air supply system;

Under being in the state of generating electricity by way of merging two or more grid systems at wind-driven generator, the humidity value that humidity sensor detects being judged, if humidity exceedes predetermined humidity threshold, then starts described air supply system.

Further, permanent magnet direct-driving aerogenerator system also comprises and is arranged near the insulation of described wind power generation trough portion and/or the insulation values measurement mechanism of core lamination gap location, and described insulation values measurement mechanism is connected with described on-off controller,

Described on-off controller, for:

Wind energy turbine set be calm or be less than incision wind speed state under, the insulating resistance value that described insulation resistance value measurement mechanism detects is judged, if described insulating resistance value is lower than predetermined insulation resistance standard value, then disconnect described power-cutting switch and open described net side and fall power-cutting switch, and start described air supply system;

Under being in the state of generating electricity by way of merging two or more grid systems at wind-driven generator, the insulating resistance value that described insulation resistance value measurement mechanism detects being judged, if described insulating resistance value is lower than predetermined insulation resistance standard, then starts described air supply system.

Further, described jet flow sealing device is the first spiral comb mechanism,

The side of the close described rotor of described oar gusset plate is provided with at least one comb air admission hole, connects by wireway is corresponding between described comb air admission hole with described second pore,

Described first spiral comb mechanism is arranged on the side of the close described rotary piston sealing ring of described oar gusset plate, described first spiral comb mechanism on the whole ringwise, described first spiral comb mechanism and described comb air admission hole UNICOM, described first spiral comb mechanism has the first spiral comb, described first spiral comb reaches in the annulus of described oar gusset plate and the formation of described rotary piston sealing ring, for producing the air-flow of screw in described annulus

On the axis direction of described stator, described comb air admission hole is positioned at the middle part of described first spiral comb mechanism, and described first spiral comb mechanism comprises the first top spiral comb and the first lower part helical comb,

Centered by described comb air admission hole, the first spiral comb away from stator support side is described first top spiral comb, the first spiral comb near stator support side is described first lower part helical comb, in the sectional view of described first spiral comb, described first top spiral comb tilts to the direction away from stator support, for generation of the inclination angle of screw towards the air-flow in the direction away from stator support, described first lower part helical comb tilts near the direction of stator support, for generation of the inclination angle of screw towards the air-flow in direction near stator support.

Further, the hand of spiral of described first top spiral comb and described first lower part helical comb is contrary.

Further, the hand of spiral of described first top spiral comb is identical with the direction of rotation of rotor.

Further, described first spiral comb also comprise first in the middle part of comb;

In the middle part of in the of described first, comb is arranged on described comb air admission hole, in the middle part of in the of described first, the air-flow flowed out from described comb air admission hole is shunted by comb, make a part of air-flow flow into described first top spiral comb, another part air-flow flows into described first lower part helical comb.

Further, described stator also comprises tower side tooth support and tower gusset plate, and described tower side tooth support is arranged on the tower side axial end of described stator core, and described rotor also has end cap seal ring,

The side of the close described rotary piston sealing ring of described oar gusset plate is provided with the second spiral comb mechanism, described second spiral comb mechanism on the whole ringwise, described second spiral comb mechanism has the second spiral comb, described second spiral comb reaches in the annulus of described oar gusset plate and the formation of described rotary piston sealing ring, for producing the air-flow of screw in described annulus.

Further, in the sectional view of described second spiral comb, described second spiral comb tilts near the direction of stator support, for generation of the inclination angle of screw towards the air-flow in direction near stator support.

Further, connect by ringwise wireway is corresponding on the whole between described comb air admission hole with described second pore, or connect by air ducts separated from one another is corresponding between described comb air admission hole with described second pore.

Further, the periphery wall of described stator support is fixed with punching retainingf key, the dovetail groove of described stator core is set on described punching retainingf key, and described gas channel is through described punching retainingf key and described first pore UNICOM.

Further, described gas channel comprises radial air flow passage and axial flow passage, described radial air flow passage passes the inside of described punching retainingf key and described stator core, one end of described radial air flow passage is connected with described first pore, the other end and described axial flow expanding channels, described axial flow passage passes axially through the inside of described stator core and described second pore UNICOM.

Further, described first pore, described second pore and described gas channel is multiple and quantity is equal, circumferentially impartial setting, the corresponding UNICOM of multiple described first pore, described second pore and described gas channel, forms many current paths independently from the periphery wall of described stator support to described oar side tooth support.

Further, described air supply system comprises the gas source generator of the air-flow producing predetermined pressure and described air-flow is carried out to the air supply processing equipment of gas source purification and dry process.

Further, described gas source generator is air compressor, and described air supply processing equipment comprises air cleaner, cooler, oil water separator and drier.

Drying control method is worked in coordination with in the sealing that the embodiment of the present invention additionally provides a kind of permanent magnet direct-driving aerogenerator system, and the method is carried out based on above-mentioned permanent magnet direct-driving aerogenerator system, and it comprises:

The groove portion insulation of wind-driven generator humidity that is neighbouring and/or core lamination gap location is detected, or the insulating resistance value of the winding of wind-driven generator is detected;

In wind energy turbine set calm or be less than incision wind speed period, if described humidity exceedes predetermined humidity threshold or described insulating resistance value lower than insulation resistance standard value, then disconnect described power-cutting switch and open described net side and fall power-cutting switch, and start described air supply system;

Be in the period of generating electricity by way of merging two or more grid systems at described wind-driven generator, if described humidity exceedes predetermined humidity threshold or described insulating resistance value lower than insulation resistance standard value, then start described air supply system.

Drying control method is worked in coordination with in the sealing that the embodiment of the present invention further provides a kind of permanent magnet direct-driving aerogenerator system, the method is carried out based on above-mentioned permanent magnet direct-driving aerogenerator system, it comprises: in the snowy or rainy period, performs and processes as follows:

If wind energy turbine set is calm or is less than the state of incision wind speed, then disconnect described power-cutting switch and open described net side and fall power-cutting switch, and start described air supply system;

If wind-driven generator is in the state of generating electricity by way of merging two or more grid systems, start described air supply system,

Without snow and without period of rain, perform and process as follows:

Further, after the snowy or rainy period, after making described air supply system open predetermined amount of time, then perform the above-mentioned process in the period without snow and without rain.

Further, after the described air supply system of startup, according to the wind speed of wind energy turbine set and the rotating speed of/wind-driven generator, the pressure of air supply system output gas flow described in self-adaptative adjustment.

Further, after the described air supply system of startup, according to the cooling requirement of wind-driven generator, the temperature of described air supply system output gas flow is adjusted.

The permanent magnet direct-driving aerogenerator system of the embodiment of the present invention and the collaborative drying control method of sealing thereof, by on-off controller to air supply system, power-cutting switch and net side are fallen power-cutting switch and are carried out switch control rule, air seal is carried out in the annulus that can realize on the one hand oar gusset plate and the rotary piston sealing ring of wind-driven generator are formed, thus effectively resist extraneous severe air-flow (such as rain or snow) and make it not easily to enter motor internal, in addition, back draught can also be utilized to go to carry out drying to the air gap between stator and rotor, take away the wet gas of discharging from stator interior, simultaneously, the heat of the heat produced by winding during generating and the time of falling power transmission winding generation, drying is carried out to motor internal, wet gas is made to be discharged to air gap between stator and rotor, and taken away by the air-flow from air supply system, thus it is collaborative dry to realize sealing.

Accompanying drawing explanation

Fig. 1 is the structure cutaway view of the permanent magnet direct-driving aerogenerator of the embodiment of the present invention one;

Fig. 2 is the partial structurtes schematic diagram of Fig. 1;

Fig. 3 be in Fig. 1 along A-A to schematic cross-section;

Fig. 4 is the axial schematic diagram of the air flow path of the stator core inside of the permanent magnet direct-driving aerogenerator of the embodiment of the present invention one;

Fig. 5 be the permanent magnet direct-driving aerogenerator of the embodiment of the present invention one stator in air-flow acquisition approach;

Fig. 6 is the stator structure schematic diagram of the permanent magnet direct-driving aerogenerator of the embodiment of the present invention two;

Fig. 7 is the partial structurtes schematic diagram of Fig. 6;

Fig. 8 is the overall air flow path schematic diagram of the permanent magnet direct-driving aerogenerator of the embodiment of the present invention;

Fig. 9 is the overall control structure schematic diagram of the permanent magnet direct-driving aerogenerator system of the embodiment of the present invention;

Figure 10 is the external structure schematic diagram of the permanent magnet direct-driving aerogenerator of the embodiment of the present invention;

Figure 11 is the close-up schematic view at the A place of Figure 10.

Drawing reference numeral illustrates:

1-stator support; 2-first pore; 3-oar gusset plate; 4-first spiral comb mechanism; 41-first top spiral comb; 42-first lower part helical comb; 5-second pore; 6-oar side tooth support; 7-punching retainingf key; 8-stator core; 9-gas channel; 91-axial passage; 92-radial passage; 10-tower side tooth support; 11-tower gusset plate; 12-air supply system; 13-mother pipe; 14-arm; 15-rotor field spider; 16-rotary piston sealing ring; The end link of 17-winding; 18-magnetic pole; 19-rotor endcap; 20-end cap seal ring; 21-comb air admission hole; 211-upper air exports; 212-lower stream of airflow exports; 22-wireway; Comb in the middle part of 23-first; 24-second spiral comb mechanism; 241-second spiral comb; Power-cutting switch K1; The net side K2 of falling power-cutting switch; First transmission line L1; Second transmission line L2.

Embodiment

First, first generality introduction is carried out to the applied environment of the embodiment of the present invention and know-why.

1. the drying theory of solution and technical support

So-called " drying ", the process of liquid (mainly moisture) is deviate from exactly from material, and most dried material is porous media, therefore porous media dry run sloughs the problem of liquid (or moisture) exactly from porous media.Dry subject system comprises drying theory, dry technology and drying process.The feature of dry run is summarized as: (1) dry run is a typical unstable state irreversible process, and its process changes in time and has irreversible characteristic; (2) dry run has multi-phase multi-component to participate in, therefore will relate to alternate with phase-change heat transfer mass transfer, and influencing factor is numerous, relation is complicated; (3) in dry run, heat and mass intercouples; (4) dry run and object materials character, containing wet component and state relation close.So, academicly must be related to irreversible thermodynamics, THERMODYNAMICAL STUDY, fluid mechanics, rheology, surface.

The drying means of practical engineering is a lot, and to get on classification from dewatering Principle, moisture undergoes phase transition with steam effusion, and transmits after aqueous water and water change vapour and occur simultaneously.From dewatering, mechanical dehydration, the wet exchange of contact and heat dehydration can be divided into (to comprise the two kinds of heat drying methods not changing material surrounding medium pressure and change material surrounding medium pressure.) here, be keep the insulation of the groove portion of winding and unshakable in one's determination, that permanent magnet machine rotor magnetic pole composite protection layer is in relatively dry state to the object of motor internal drying.Heated drying method is the main drying means of most widely used one.In heated drying method, provide energy to material, make the moisture in material become steam, and then shift out from material.Heated drying is divided into again that convective drying, conductive drying, radiant drying, high-frequency dielectric are dry, sound wave is dry and combination drying.The drier of convective drying is hot gas, and its dry run is by the macroscopic motion of hot gas around material, evaporates to material heat supply to make internal batch moisture, and the moisture on material surface or steam to be taken in large space by macroscopic convection and go.Hot-air is exothermic medium and moisture absorption medium.Affect the many factors of convective drying, mainly contain hot gas parameter and material size, shape and characteristic.Hot gas parameter mainly refers to temperature, moisture concentration and speed.Hot gas temperature having the greatest impact to rate of drying, along with the raising of the temperature of hot gas, rate of drying is with hot gas temperature linear growth.The impact of hot gas flow velocity on rate of drying is not obvious, but rate of drying slightly reduces with the increase of air moisture concentration, and material structure and size are also obvious on the impact of thermal convection dry run.Experimental study shows, for lump material, drying time is relevant with material thickness R, and material is thicker, and drying time is longer.Conductive drying feature is that dry tenacity is high, and than the convective drying intensity height 1-2 order of magnitude, hot-fluid gos deep into internal batch, internal batch moisture is evaporated, and the gasification rate of water shifts out speed higher than steam, therefore produce pressure reduction, under the effect of this pressure reduction, steam outwards overflows.Radiation or the optical characteristics of radiant drying process and radiation source and material are relevant.Result of study shows: the radiation wavelength of infrared source is advisable with 0.4-15 microns.

The feature of convective drying process: when the air-flow that temperature is higher directly contacts with wet stock, gas, solid two alternate generations be heat, the process simultaneously transmitted of matter.Under any circumstance, heat (sensible heat) is always transmitted to low-temperature level by high-temperature position, and material is always passed on from one to another to low dividing potential drop phase by high partial pressures.Temperature is the criterion in heat transfer direction, and dividing potential drop is the criterion in mass transfer direction.Obviously, as long as do not reach saturated (nonsaturated air) containing steam in air, this air with synthermal under water contact its mass transfer direction ratio by water to gas.Material surface temperature is lower than gas flow temperature, and gas heat-transfer is to solid.During the dividing potential drop of the steam dividing potential drop in air-flow lower than surface of solids water, water is vaporized and enters gas phase, and the moisture of wet stock inside diffuses to surface with form that is liquid or steam.Therefore, convective drying is a heat, matter back transfer process.

2, moisture is in gas-solid two alternate balances

Water can be different in solid material form exist, be combined with solid-phase in a different manner.When solid material has crystal structure, wherein may contain a certain amount of crystallization water, this part water is combined with solid-phase with chemical force.When the material system porousness of solid, its contained humidity can be present in pore and to be subject to the effect of hole wall capillary force.When the surface of solids has adsorptivity, the moisture contained by it is then incorporated into because being subject to absorption affinity on the inside and outside surface of solid.These water be combined with solid-phase by chemical force or physical-chemistry force are referred to as Bound moisture above.When material moisture more time, except a part of water and solid bond, remaining water is just mechanically attached to the surface of solids, and these water claim unbound water.Bound moisture and the basic distinction of unbound water are that the equilibrium vapour pressure that it shows is different.The character of unbound water is identical with pure water, and the equilibrium vapour pressure of its performance is the saturated vapor pressure of synthermal lower pure water.Bound moisture is then different, and because of existence that is chemical and physical-chemistry force, the vapour pressure showed is lower than the saturated vapor pressure of synthermal lower pure water.No matter as long as there is unbound water to exist and its quantity in material, its equilibrium vapour pressure can not change, always the saturated vapor pressure of pure water.When water content reduces, unbound water has not existed, and what after this first remove is combine more weak water, and remaining is combine stronger water, and thus equilibrium vapour pressure declines gradually.If the moisture in solid material all belongs to unbound water, as long as then air does not reach saturated, and have enough times of contact, water all in principle all will be taken away by air, just as the water on road after rain is dried.But when there being Bound moisture to exist, situation is just different.Skim over synthermal wet solid with the air of relative humidity ψ, after long-time, the water content of solid material, but can not adiabatic drying by by original reduction, and material, specifying the limit dried under air conditions, is called the equilibrium moisture content under this air condition.Allly can be designated the moisture that air takes away and be called free moisture.Whether the combination of water is the character of solid material, has nothing to do with air condition.When solid aqueous amount lower (all belonging to Bound moisture), relative air humidity ψ is larger, not only both contacts can not reach the object of dry materials, and moisture can also proceed to solid phase from gas phase, namely hygroscopic effect occurs.Getting damp of biscuit is an example.Whole dry run can be divided into constant rate drying period and falling rate drying period, and the heat transfer of each drying stage, mass transfer have respective feature.At falling rate drying period, the Changing Pattern of rate of drying is relevant with material properties and internal structure thereof.At constant rate drying period, the reason of reduction of speed roughly has four: (1) actual pneumatization reduces; (2) move in gasification face; (3) equilibrium vapor drops; (4) moisture diffusion of solid interior is extremely slow.

3, the macroscopic properties of the inner dry run of outer rotor permanent-magnet wind-driven generator is directly driven

(1) generator amature permanent magnetic material magnetic pole composite protection layer appearance and the moisture between stator outer surface and dry air, heat transfer law

Brief analysis power generator rotor magnetic pole composite protection layer appearance and stator (unshakable in one's determination and winding) between outer surface and dry air thermal mass exchange mechanism.

In the outside heat of power generator rotor magnetic pole composite protection layer appearance and stator (unshakable in one's determination and winding), mass exchange, the external agency boundary-layer (or boundary layer) being δ at their surface thicknesses plays an important role.In this boundary-layer, moisture (comprising liquid water and steam) concentration, the speed of external agency hot-air and the distribution of temperature and pressure, be different from motor internal environment large space.

In the dry run of rotor magnetic pole, concentration, temperature, pressure, the speed Changing Pattern in boundary-layer is not quite similar.In 0-δ boundary layer, motor inner drying medium velocity is ascending, temperature from low to high, therefore the velocity gradient of external agency is consistent with the direction of temperature gradient, but moisture concentration from high to low, from high to low, moisture gradient, vapor partial pressure gradient and velocity gradient, temperature gradient are contrary for vapor partial pressure.The phenomenon that gradient is contrary and the high fact of boundary-layer humidity concentration, all make material moisture transmission amount outwardly reduce, rate of drying reduced.But due to larger to 0 direction gradient along boundary-layer δ, thus the air flow material surface that external agency middle-molecular-weihydroxyethyl is heavier is promoted, the steam that molecular weight is lighter is flushed in the air gap between electric machine rotor, meanwhile, hot-air brings heat again, the impouring of hot-air also makes boundary-layer be damaged, so enhance heat transfer with dry.

(2) generator amature permanent magnetic material magnetic pole composite protection layer appearance and the quantitative analysis of stator exterior mass exchange

In constant rate of drying period, when steam transmits moisture by boundary-layer to power generator rotor magnetic pole composite protection layer appearance and stator (unshakable in one's determination and winding) outer dry air with diffusion way, moisture transmission amount between they and dry air, with convective mass transfer formulae express:

The biodiversity flow rate that material outwardly transmits=(taking chemical potential as the convective transfer coefficient of transport potential) × (material surface and external agency are (in applied environment of the present invention, concrete corresponding dry air) in the difference of humid air chemical potential), wherein, in applied environment of the present invention, material mentioned here specifically can the part of respective rotor magnetic pole overcoat and stator surface, the corresponding dry air of medium.

When boundary-layer temperature gradient is very little, the moisture transmission of they and external agency take vapor partial pressure as steam transport potential, its vapor migration metric density=(with vapour pressure for passing the convective transfer coefficient of wet gesture) × (difference of material surface vapor pressure and external agency vapour pressure) × 760/ atmospheric pressure

In falling rate of drying period, then with relative moisture concentration u for moisture (containing steam) is from material table towards the transport potential of surrounding medium, its moisture transmission amount=(convective transfer coefficient being MASS TRANSFER POTENTIAL with moisture concentration) × (material surface moisture concentration and the difference of equilibrium moisture content concentration).

(3) hidden danger is left at manufacturing link power generator rotor magnetic pole infiltration moisture and humid air

The bonding agent of the permanent magnetic material magnetic pole overcoat be made up of galss fiber reinforced resin, magnet steel and rotor yoke wall gap-fill, adsorbs air, steam in these link spaces.Water cure met by the sizing material of the isocyanate groups in the many components bonding agent used, and is attended by the release of carbon dioxide, causes the formation of foamed polymer.

Generator amature vertical axes laying state carry out vacuum injecting glue, permanent magnetic material magnetic pole upper 2/3rds be full of bonding agent after, under the effect of vacuum pressure reduction, here inside and outside differential pressure is close to vacuum degree, but at lower 1/3rd places, the closer to gum-injecting port, top is less than at this region inside and outside differential pressure of injecting glue later stage, the pressure of outer surface to glass-fiber-fabric is weaker than upper area, previously carried a large amount of air, steam in glass-fiber-fabric, especially it is to be noted that: 43 degree Celsius of the attached water comprising vacuum gasified will be vaporized.Glass-fiber-fabric braid genus polyporus material, carry humid air moisture content before using, space network provides the material conditions of wrapping up humid air between infiltration stage.Heating and gasifying is equivalent to pressurization and is extruded and is called bubble when vacuumizing, glass-fiber-fabric braid genus polyporus material space network meets the necessary condition of steam gasification core substance structure simultaneously.

(4) in generator stator core and groove, mechanism is got rid of in the gasification of winding heat transfer Bound moisture

Existing Theory and technology is risen to the various environment correspondences residing for the generator material in generator unit stator vacuum paint dipping process, operation use procedure, stopping process, climatic season alternation procedure and removes analyze and solve.By between stator core (solid skeleton) lamination, between the wire of winding and multilayer (macromolecule) insulating material, insulate in groove between etc. be positioned at " porous material " attribute category.The phase-change heat transfer that the thermal convection of gas, liquid seepage between the heat transfer of stator material inside, space, liquid phase water evaporation are condensed with gas phase steam; The mass transfer category of stator interior and the water between material and environment, steam and air (saline mist) mass diffusion; In the heat production of dependence wire, cause stator interior storeroom gas (steam and dry air) state variation (phase transformation: liquid phase water evaporates or steam condenses), when material is in heating process, steam quality wherein can change because of phase transformation, cause storeroom thus, the distribution of material internal water-vapour density can change, form water-vapour density gradient (actuating force of diffusion); The change of inner aqueous rate balances each other with envionmental humidity (outside motor, the size of the humid air humidity of humid air humidity and air gap inside, material internal decides mass transfer and the steam direction of transfer of the steam of inside and outside both sides); The rule display of the porous material of verification: temperature, the humidity change of season and climatic factor can directly cause insulating resistance value to change; View data display on evidence: winding temperature rising rule does not react the temperature scenario of natural wind cold side far-end between lamination, the inner heat production air pressure change display of porous material is risen fast, but because various places inside leakage approach is inconsistent, there will be the sight that drop of pressure speed is also inconsistent.Particularly importantly: between material internal lamination, wire and multilayer (macromolecule) insulating material, insulate in groove between get involved self space that can provide to steam and porosity is the prerequisite that above-mentioned mechanism exists.

Under strong magnetic field action, when water is magnetized, the state that hydrone itself combines also becomes short chain from long-chain, makes the water capacity easily infiltrate in hard core lamination finedraw, promotes the capillarity between lamination; Water is more easily infiltrated in the hard porous material after vacuum pressure impregnation, the form after corrosion unshakable in one's determination is changed, become loose by sediment shape thing that current are taken away.

(5) the heat moisture transfer law in power generator rotor magnetic pole composite protection layer

At generator amature permanent magnetic material magnetic pole galss fiber reinforced resin overcoat, in the heat drying process of the porous wet stock that these have " capillary ", when material moisture content is less, in material, moisture transmission is based on vapor migration, when material moisture content is larger, in material, moisture part moves to the evaporation layer of material with form of liquid water, shifts out in vapour form again after this evaporation.When evaporating beginning, evaporation layer, near material surface, then moves to material internal gradually, the violent gasification consequently causing material internal moisture when heating is strong, and when steam removes speed lower than gasification rate, water and steam volume acutely increases.In porous material space, there is larger flow resistance, thus in material, form larger barometric gradient, this barometric gradient is exactly cause the actuating force of vapor movement.In addition, water liquid film flow on the channel wall of porous material capillary porosity, be also the important form that aqueous water moves in material, this migration constantly supplies aqueous water to evaporation layer, thus enhances evaporation.When in material, moisture concentration gradient is consistent with temperature gradient direction, its moisture transmittance process can be expressed as:

Moisture flow rate in material=(the moisture current density in material caused by moisture concentration gradient)+(the moisture transmission density caused by the temperature difference in material)+(the moisture transmission density caused by pressure differential in material).

Namely decision is combined by three gradient moisture gradients, temperature gradient and barometric gradients.

4, wind-driven generator operational environment and sealing mechanism analysis are in the course of work of blower fan, oar side is generally just to upwind, upwind incoming flow clashes into generator unit stator support and can rebound, sputter, back reflection, accumulation is clashed into again with rotary piston sealing ring, cause the restorative rising of stream pressure (when comparing incoming flow), these air-flows will be invaded in the ring-type air gap between oar gusset plate and rotary piston sealing ring.

Embodiments of the invention propose for this technical problem just.The know-why of the embodiment of the present invention utilizes the gas channel in permanent magnet direct-driving aerogenerator stator core to be incorporated on the axial end of stator core by inner for unit source of the gas, and the annulus formed for oar gusset plate and rotary piston sealing ring arranges jet flow sealing device (in a preferred embodiment, the annulus place formed at oar gusset plate and rotary piston sealing ring arranges spiral comb mechanism), thus build pressure-fired environment in the inner space formed after the stators and rotators combination of blower fan, resist extraneous severe air-flow (gas, liquid, Gu multiphase flow, wherein there is air, steam, rain, snow, salt fog, sand and dust, floccule etc.) invasion.The embodiment of the present invention said " pressure-fired " refers to the air-flow produced by the source of the gas of electric system inside, the pressure produced at rotor " annular seal gap " place is greater than the pressure that extraneous incoming flow produces in this porch, and the size of pressure can make extraneous air-flow to enter motor internal.Wherein, above-mentioned severe air-flow mainly refers to rainwater biphase gas and liquid flow or wind and snow Dual-Phrase Distribution of Gas olid, also there is gas, liquid, solid multiphase flow under certain extreme case, such as, have air, steam, rain, snow, salt fog, sand and dust, floccule etc.These severe air-flows mainly come across the atrocious weather such as rain or snow situation and descend, therefore, the device of the embodiment of the present invention mainly designs to resist these severe air-flows, and under normal dry weather, the device of the embodiment of the present invention can not be used, and allow dry gas stream enter in wind-driven generator, for carrying out drying, cooling to blower fan.

Below in conjunction with accompanying drawing, embodiments of the present invention is described in detail.

Embodiment one

The permanent magnet direct-driving aerogenerator system of the present embodiment comprises wind-driven generator and current transformer on the whole, on this basis, also comprise air supply system, power-cutting switch, on-off controller and jet flow sealing device are fallen in net side, by the work compound of this system various piece, realize sealing and the drying of wind-driven generator.Respectively various piece will be described below.

As shown in Figure 1, it is the structure cutaway view of the permanent magnet direct-driving aerogenerator of the embodiment of the present invention one.Top in Fig. 1 can be defined as oar side for convenience of description (in the process of blower fan work, oar side is weather side faced by meeting generally), below is defined as tower side (in the process of blower fan work, tower side is downwind side faced by meeting generally), horizontal direction is defined as radial direction (radial direction centered by whole blower fan), and vertical direction is defined as axially (direction along the rotating shaft of wind-driven generator).

Wind-driven generator in the present embodiment comprises stators and rotators two parts, and Fig. 1 shows wind-driven generator structure in sectional view.Wherein, stator comprises stator support 1, is arranged on the stator core 8 of the periphery wall of stator support 1, oar side tooth support 6 and oar gusset plate 3, and oar side tooth support 6 is arranged on the oar side axial end of stator core 8.Here, the periphery wall of stator support 1 refers to and to connect or adjacent sidewall with the punching retainingf key 7 (see Fig. 3) of stator core 8 or fixed stator iron core 8, i.e. the outermost part of stator support 1.In addition, the rotor mated with stator has rotary piston sealing ring 16, and rotary piston sealing ring 16 is positioned at oar side, forms annulus with oar gusset plate 3.

In above-mentioned stator structure, the periphery wall of stator support 1 can offer at least one first pore 2, oar side tooth support 6 offers at least one second pore 5.Stator also comprises at least one gas channel 9 of UNICOM first pore 2 and the second pore 5, and gas channel 9 is through the inside of stator core 8.

Except wind-driven generator, permanent magnet direct-driving aerogenerator system also comprises air supply system and jet flow sealing device, air supply system is used for jet flow sealing device supply gas, this air supply system is connected with the first pore 2, and jet flow sealing device and the second pore 5 UNICOM, by jet flow sealing device by the air-flow from the second pore 5 to both direction drainage, make wherein one air-flow (as Fig. 1 top roughly towards left arrow) flow to the annulus that oar gusset plate 3 and rotary piston sealing ring 16 formed, this strand of air-flow is mainly used in sealing annulus, to resist the invasion of extraneous severe air-flow, another strand of air-flow (as Fig. 1 top roughly towards right side arrow) flow to air gap between stator and rotor, this strand of air-flow is mainly used in stator, rotor surface, magnetic pole surfaces carries out drying, take away the moisture that motor internal is discharged.

In order to the moisture of motor internal is discharged, the permanent magnet direct-driving aerogenerator system of the present embodiment also relates to the control to current transformer, thus rely on when utilizing wind turbine power generation the heating of stator winding (heat release when comprising normal power generation and by current transformer fall power transmission and make heating in winding) drying is carried out to stator interior, moisture is discharged in the air gap between stator surface and rotor.Wherein, as shown in Figure 9, current transformer comprises rectification unit, DC master row and inversion unit, and inversion unit is connected with electrical network.The first transmission line L1 between rectification unit and wind-driven generator is provided with power-cutting switch K1, has the second transmission line L2 between DC master row and wind-driven generator, the net side K2 of falling power-cutting switch is arranged on the second transmission line L2.In addition, permanent magnet direct-driving aerogenerator system also comprises on-off controller, it is with air supply system, power-cutting switch K1 and net the side K2 of falling power-cutting switch and be connected (dotted line in Fig. 9 represents control connection relation), for controlling power-cutting switch K1 and the net unlatching of the side K2 of falling power-cutting switch and disconnection, and the startup of air supply system and closedown.

When opening air supply system by on-off controller, jet flow sealing device will spray air-flow, thus realize the sealing of annulus, oar side, also can produce the air-flow flowing through air gap between rotor and stator simultaneously, thus drying is carried out to stator, rotor surface, magnetic pole surfaces.Meanwhile, when blower fan is in generating state, stator winding inherently has electric current flow through and produce heat, when blower fan is in non-power generating state, power-cutting switch can be disconnected by on-off controller and fall power-cutting switch and close, dependence electrical network falls power transmission and can make stator winding heat release equally like this.Stator winding heating can carry out drying to stator interior, moisture is discharged to the air gap between stator surface and rotor, then the air-flow coordinating jet flow sealing device to produce, and is taken away by the moisture of discharge, thus realizes carrying out desiccation to motor internal.As can be seen here, pass through air supply system, jet flow sealing device, the coordinated that winding generating heat release control and the winding heating of falling power transmission control, the sealing of blower fan severe air-flow to external world can be realized, stator, rotor surface is dry, multiple functions such as stator interior is dry, really achieve sealing in wind-driven generator collaborative dry, and by on-off controller to air supply system, fall the conservative control of power-cutting switch for power-cutting switch and net side, state (generating state or stopped status etc.) residing for external environment (being beneficial to weather condition) and blower fan reasonably sequencing control can be carried out.

Respectively the major part of above-mentioned permanent magnet direct-driving aerogenerator system will be described in detail below:

(1) jet flow sealing device

Preferably, the concrete structure of jet flow sealing device is the first spiral comb mechanism 4, and as shown in Figure 2, it is the partial structurtes schematic diagram of Fig. 1, the figure shows the active sealing structure using spiral comb.As depicted in figs. 1 and 2, the side of the close rotor of oar gusset plate 3 is provided with at least one comb air admission hole 21, connect by wireway 22 is corresponding between comb air admission hole 21 with the second pore 5, the first spiral comb mechanism 4 is provided with in the side of the close rotary piston sealing ring 16 of oar gusset plate 3, first spiral comb mechanism 4 on the whole ringwise, first spiral comb mechanism 4 and comb air admission hole 21 UNICOM, first spiral comb mechanism 4 has the first spiral comb, first spiral comb reaches in the annulus of oar gusset plate 3 and rotary piston sealing ring 16 formation, for producing the air-flow of screw in annulus.

In said structure, being achieved by the first pore 2, gas channel 9 and the second pore 5 is incorporated on the axial end of stator core 8 by the air-flow that inner source of the gas produces, and then, again by wireway 22 be arranged on the comb air admission hole 21 on oar gusset plate 3, air-flow is drawn out to the first spiral comb mechanism 4 oar gusset plate 3 from the second pore 5, thus produces spiral air flow in annulus.

Wherein, the first pore 2, second pore 5 and comb air admission hole 21 can be circle also can be triangle, ellipse.In addition, pore also can be the gas port etc. of other shape, in a word, as long as can conducting air-flow.Preferably, above-mentioned pore is circular pore, and circular pore can reduce the flowing on-way resistance to air-flow.

In the application of reality, suitable for the end of rotary piston sealing ring 16 outwardly and by the end of rotary piston sealing ring 16 can be made to obtain relatively thin (as shown in fig. 1), thus can ensure that spiral comb has enough length, give full play to the effect of spiral stream guidance.

By the above-mentioned stator structure with the first spiral comb mechanism 4, can the air-flow of stator interior be incorporated on the axial end of stator core 8, and then produce spiral air flow by the first spiral comb mechanism 4 be arranged in annulus, because spiral air flow itself has certain airtight effect, therefore, pressure-fired environment can be produced in annulus, thus resist the severe air-flow in the external world (such as rain or snow etc.) invaded from the annulus between oar gusset plate 3 and rotary piston sealing ring 16, make it not easily to enter motor internal, thus the useful life of permanent magnetism magnetic pole 18 can be extended, prevent motor internal device " insulation level reduction ", reduce risk that motor corrodes by severe air-flow (such as rain or snow etc.) and insulating reliability can be guaranteed.

Further, can find out in fig. 2, comb air admission hole 21 can be positioned at the middle part of the first spiral comb mechanism 4, centered by comb air admission hole 21, first spiral comb is divided into two parts, wherein, the first spiral comb away from stator support side is called the first top spiral comb 41, the first spiral comb near stator support side is called the first lower part helical comb 42.

Preferably, the hand of spiral of the first top spiral comb 41 and the first lower part helical comb 42 is contrary, thus can form two strands of contrary air-flows of rotation direction, plays the effect of better shunting and sealing.

Further, as can be seen from the sectional view of Fig. 2, the first top spiral comb 41 tilts to the direction away from stator support, and the first lower part helical comb 42 tilts near the direction of stator support.The inclination angle of spiral comb will change the direction of the active force to air-flow, thus increase the advanced speed of air-flow towards the incline direction of spiral comb of screw, coordinate the feature that upper and lower spiral comb rotation direction is contrary, thus it is contrary and accelerate the air-flow of advancing along upper and lower both direction to form two bursts of screw directions, thus form reverse double-helix sealing, greatly increase the sealing effectiveness of spiral comb.In addition, upper and lower two strands of air-flows, at work due to the motion of rotor, also can be driven to both direction, can improve reverse double-helix sealing effectiveness further by blower fan.

Specifically, in the part of the first spiral comb mechanism 4, the mass motion of air-flow can be divided into roughly along the screw of the circumferencial direction of stator with roughly along the rectilinear motion in axis stator direction.Composition graphs 2, be horizontally disposed with (level mentioned here is only in the plane shown in Fig. 2) if all spiral comb in Fig. 2 are, then the hand of spiral of air-flow will roughly vertical with paper and in plane in level the plane of comb 23 place (namely in the middle part of Fig. 2), air-flow is advanced with the both direction up and down of the form of screw to Fig. 2 simultaneously, and when spiral comb direction is not horizontal direction but has certain angle of inclination, if the first top spiral comb 41 is for being inclined upwardly, the screw of the air-flow of then advancing above Fig. 2 will be no longer level, the inclination angle of screw is towards the direction away from stator support, in like manner, first lower part helical comb 42 produces the air-flow of inclination angle towards the direction near stator support of screw, such design can be accelerated air-flow and advance to the direction of flowing, and the effect better resisting external air flow can be played.

Further, comb 23 in the middle part of comb air admission hole 21 can also be provided with first, in the middle part of in the of first, comb 23 is arranged on comb air admission hole 21, in the middle part of in the of first, the air-flow from comb air admission hole 21 is carried out shunting comb 23 in the middle part of (as depicted in figs. 1 and 2) first and comb air admission hole 21 is divided into upper and lower two air stream outlets by comb 23, i.e. upper air outlet 211 and lower stream of airflow outlet 212), a part of air-flow is flowed to the direction away from stator support 1 by the first top spiral comb 41, another part air-flow is flowed near the direction of stator support 1 by the first lower part helical comb 42.

It should be noted that, in the middle part of in the of first, comb 23 is not necessary parts, also comb air admission hole 21 can be made directly in the face of the first top spiral comb 41 and the first lower part helical comb 42, namely comb 23 in the middle part of can omitting first, make the initiating terminal of a part facing to the first top spiral comb 41 of comb air admission hole 21, air-flow facing to the initiating terminal of the first lower part helical comb 42, thus also can be shunted by another part.Only, when arranging in the middle part of in the of first comb 23, the loss on stream pressure and flow velocity can be reduced, upper and lower two strands of spiral air flows are isolated better.

In the first above-mentioned spiral comb mechanism 4, centered by comb air admission hole 21, the air-flow from inner source of the gas can be divided into two strands of air-flows.

On the one hand, the air-flow moved downward along whole annulus spiral can be produced by the first lower part helical comb 42, this strand of air-flow is after the first lower part helical comb 42, forming " forced draft annular barrier ", going initiatively to resist from upwind, for entering " gas-liquid-solid multiphase flow " of motor upwind annular gap by " combined helical labyrinth seal " (labyrinth seal of the helical structure feature with angle of inclination of the first lower part helical comb 42).

On the other hand, the air-flow moved upward along whole annulus spiral can be produced by the first top spiral comb 41, this strand of air-flow is after the first top spiral comb 41, enough pressure is set up for auxiliary pressure seal air-flow, while forming " forced draft annular barrier ", motor gas-gap (air gap between the rotor namely on the right side of Fig. 1) is entered by " combined helical labyrinth seal " (" labyrinth seal of the helical structure feature with angle of inclination of the first top spiral comb 41 "), go to dry motor internal surface, and then collect in stator end cabin side (namely between tower side tooth support 10 and rotor endcap 19) vertically, enter in atmospheric environment finally by the annular gap between end cap seal ring 20 and tower gusset plate 11.This strand spiral air flow is upwards the drying air-flow as heat convection mass transfer, for taking away the moisture (moisture that motor internal is discharged due to winding heat production) of stator, rotor surface, magnetic pole surfaces, can prevent moisture from turning back in motor like this, thus prevent the moisture returned from destroying the insulating properties of the inner insulation material of motor.

Further, can also the hand of spiral of the first top spiral comb 41 be designed to identical with the direction of rotation of rotor.By such design, more can effectively utilize this strand of air-flow through top spiral comb, on the one hand, the turning effort of rotary piston sealing ring 16 can be utilized, accelerated by the screw of the frictional force between rotary piston sealing ring 16 and air-flow to air-flow, make air-flow can accelerate to move upward, can arrive and air gap (having the gap representing that the arrow of air-flow passes through on the right side of Fig. 1) between stator and rotor with higher speed, improve the drying efficiency to motor, on the other hand, air-flow can be made when entering the air gap between stator and rotor, the effect of further strengthening dry rotor permanent magnet magnetic pole protection Anti-corrosion glass fiber reinforced resin cladding, strengthen dry stator surface simultaneously, facilitate in machine cavity, air gap inner drying air flow field and the higher collaborative e-commerce of humid air concentration field, reach the object of strengthening drying.

It should be noted that further, the pumping head (end of spiral comb) that " combined helical labyrinth seal " (i.e. first top spiral comb 41) of below produces is down in fig. 1 and 2, the pumping head that " the combined helical labyrinth seal " of top produces is upward, and the hand of spiral of the first top spiral comb 41 and the first lower part helical comb 42 can be set to rightabout, namely can with comb 23 in the middle part of first for two ends, boundary form the contrary spiral of rotation direction, thus will the contrary air-flow in screw direction be produced, thus advantageously in shunting two air-flows, and strengthen the effect of labyrinth seal, and owing to being through from upper and lower two air stream outlets air-flow out in respective ring week, be beneficial to " poly-pressure " and form all consistent forced drafts of ring.

In sum, in the technical scheme of the embodiment of the present invention, use pressurized seal technological thought, utilize the pressure of jet air in spiral comb in open-type electric machine upwind air inlet between annular gap, set up in " part annular space " and " pressure-fired ", come the gap between shutoff generator rotating parts and stationary parts, prevent upwind air stream from carrying rainwater or snow enters this gap, to ensure sealing.The pressure that source of the gas produces in this sealing place is more higher than the outer natural environmental stress of motor.Set up the sealing means of open-type wind driven generator and construct the concrete structure of air flow channel.

In sum, above-mentioned sealing mechanism contains static seal and movable sealing two kinds of sealing states from sealing state, contain the combination of comb, spiral, air pressure three kinds of sealing principles from sealing mechanism, thus can fully heterogeneous air-flow be shielded outside annulus gap.

In addition, upwind air stream carry rainwater (or snow) clash into wind-driven generator be obstructed after after passing through stator coaming plate and rotary piston sealing ring 16 (coaming plate), arrive the annular gap between oar gusset plate 3 and rotary piston sealing ring 16, rainwater biphase gas and liquid flow or wind and snow Dual-Phrase Distribution of Gas olid mineralization pressure in generator upwind annular gap.Utilize the general principle of hydromechanical poised state, the pressure needed for exit flow and the flow velocity of the spiral comb mechanism as pressurized seal element in annular gap can be calculated.Airflow path outlet in the expansion cavity of labyrinth seal, structure " open loop helical form conflux chamber ", serves as the effect that female manifold stream is all pressed.The enough pressure that the sealing of spiral comb combination pressure relies on source of the gas to provide produces high velocity air, and exit velocity, flow are controlled, to adapt to the change of upwind air velocity.That is: the pressure of pressurized seal can adjust as required automatically, realizes " self adaptation " and regulates, to reach the less object of source of the gas source wasted work.

In addition, the wireway connected between comb air admission hole 21 and the second pore 5 can have the following two kinds form:

1) wireway 22 on the whole ringwise, and the form of namely with the first spiral comb mechanism 4 is the same, and wireway 22 extends, in the annular of 360 degree along the circumference of oar side tooth support 6.Such structure sends into comb air admission hole 21 after the air-flow that multiple second pore 5 flows out can being carried out Homogeneous phase mixing in a circumferential direction again, thus can make the air-flow pressure uniform in a circumferential direction entering comb air admission hole 21.

2) connect by air ducts 22 separated from one another is corresponding between comb air admission hole 21 with the second pore 5.This structure does not need the wireway 22 making annular, thus relatively simple on parts make.Wireway 22 can be determined according to the quantity of the second pore 5, as below the gas channel introduced be 48, so accordingly, the quantity of wireway 22 correspondence can be set to 48.

(2) gas channel of stator core inside

The gas channel 9 of stator core 8 inside is incorporated at least one second pore 5 place that oar side tooth support 6 is offered for the source of the gas provided by the air supply system 12 of stator interior.Particularly, as shown in Figure 3, its be in Fig. 1 along A-A to schematic cross-section.The periphery wall of stator support 1 is fixed with punching retainingf key 7, (stator core 8 is formed by many lobes block combiner unshakable in one's determination in stator core 8, each module unshakable in one's determination is made up of core lamination) there is dovetail groove, this dovetail groove is set on punching retainingf key 7, thus stator core 8 is fixed on the periphery wall of stator support 1.First pore 2 can be positioned on the periphery wall of the stator support 1 contacted with punching retainingf key 7, and gas channel 9 can through the pore of punching retainingf key 7 and the first pore 2 UNICOM.

As shown in Figure 1, gas channel 9 can comprise radial air flow passage 92 and axial flow passage 91, radial air flow passage 92 can pass the inside of punching retainingf key 7 and stator core 8, one end of radial air flow passage 92 is connected with the first pore 2, the other end is connected with axial flow passage 91, and axial flow passage 91 can pass axially through inside and second pore 5 UNICOM of stator core 8.Wherein, radial air flow passage 92 can directly be connected with axial flow passage 91, also can connect, in a word, as long as radial air flow passage 92 can be connected with axial flow passage 91 after bending arbitrarily again.

In addition, the first pore 2, second pore 5 and gas channel 9 can be multiple and quantity is equal, circumferentially impartial setting.Wherein, multiple first pore 2, second pore 5 and the corresponding UNICOM of gas channel 9, form many current paths independently from the inwall of stator support 1 to oar side tooth support 6.Preferably, in the below of oar side, the inside tooth support 6 of stator core 8, radial air flow passage 92 turns to 90 degree, stator core 8 inside and enters axial flow passage 91, and axial flow passage 91 is parallel to motor stator axially.As shown in Figure 4, it is the air flow path schematic diagram of the stator core inside of the permanent magnet direct-driving aerogenerator of the embodiment of the present invention, wherein, radial air flow passage and axial flow passage one_to_one corresponding, illustrate only axial flow passage in figure, the embodiment of the present invention has several gas channels, preferably, as shown in Figure 4, Fig. 4 is the air flow path schematic diagram of the stator core inside of the permanent magnet direct-driving aerogenerator of the embodiment of the present invention one.Be provided with 48 gas channels altogether, their length (L ₁, L ₂l ₄₈)/internal diameter (d ₁, d ₂d ₄₈)/absolute roughness (ε ₁, ε ₂ε ₄₈) preferably identical, circumferential interval is also consistent.

(3) air supply system of Wind turbines inside

As shown in Figure 5, the source of the gas in the air supply system 12 (particularly, air supply system 12 can be arranged between stator support or in cabin space) of Wind turbines inside can take from the pressure generator in cabin.Air supply system 12 can resist the elements " biphase gas and liquid flow " and the intrusion of wind and snow " Dual-Phrase Distribution of Gas olid " in rain, snow weather period; Air supply system 12, needing the time period work of dry motor internal, makes the energy consumption decreasing source of the gas while abundant dry generator stator insulator and rotor magnetic pole overcoat.The gas channel 9 arranged in the stator is connected with air supply system 12 by the first pore 2, is caused in gas channel 9 by the source of the gas of Wind turbines inside.Air supply system 12 can comprise the gas source generator producing predetermined pressure air-flow and the air supply processing equipment that can purify air-flow and drying processes.

Gas source generator can be air compressor or air blast etc., air compressor (or being called air compressor) is pressure generator, it improves the pressure of air or the machine of conveying air, is also a kind of conversion equipment changes mechanical energy that prime mover supplies being become air pressure energy.In the air compressor course of work, the air be in compresser cylinder is compressed rapidly, and gas is an exothermic process by the process compressed rapidly, the temperature of compresser cylinder must be caused to raise, therefore, generally need cool.Can 140-170 DEG C be reached in the air compressor afterbody exhaust temperature of multi-stage compression; under such high temperatures; certain gaseous state oil and steam is often mixed with in compressed air; need to arrange cooler cooled compressed air; with oil content contained in initial isolation compressed air and moisture, prevent oil content and moisture from entering stator core of wind driven generator runner with compressed air.Therefore, air supply processing equipment can also comprise air cleaner, cooler, oil water separator and drier.Wherein, air cleaner is used as to filter the gas before entering air compressor cylinder (namely filtering dust contained in air in cabin and other impurity), after entering air compressor for preventing the dust in air, solid impurity etc., cause the friction and wear of relative movement part in air compressor cylinder.

In addition, oil water separator (gas-liquid separator) is used as to be separated oil content contained in compressed air and moisture further, the air after compression is made to obtain preliminary purified treatment, for eliminating oil content and moisture to motor stator bracket and inner flow passage unshakable in one's determination thereof, the pollution of generator, corrosion.

In addition, compressed air after cooler and oil water separator, still containing certain moisture, its content number depend on the size of the temperature of air, pressure and relative humidity.It is desirable that dry air in motor, therefore need to arrange air dry-set, i.e. drier.

Further, as shown in Figure 5, its be the permanent magnet direct-driving aerogenerator of the embodiment of the present invention one stator in air-flow acquisition approach, air supply system 12 can be connected with the first pore 2 with arm 14 by female pipe 13, can draw the arm 14 identical with the first pore 2 quantity from female pipe 13, arm 14 correspondence is connected on the first pore 2.Female pipe 13 is preferably annular, also can be the annular segments of segmentation, thus can reduce the on-way resistance that causes the flowing of air-flow.

In addition, can have two as desiccant thermal source, one is arrange drier in above-mentioned air supply system 12, and another is stator coil.Adopt stator coil as drying source, can also apply under stopped status, need to fall power transmission through current transformer inversion unit to generator unit stator by electrical network, make stator heat production come dry stator interior structure and internal material.When by two thermals source with the use of, moisture is discharged to stator surface by stator generates its own heat by the moisture of stator interior, and then by being taken away from stator surface by moisture from the dry air of inner air supply system 12, thus reach the effect simultaneously dehumidified inside and outside stator.

(4) air current flow path

In cabin, air draught delivers to the first pore 2 on stator support 1 after the filtration drying compression of air supply system 12, air-flow is entered the radial air flow passage 92 of stator core 8 through punching retainingf key 7 by the first pore 2, air-flow radially gas channel 92 proceeds to axial flow passage 91, the second pore 5 on oar side tooth support 6 is passed afterwards by axial flow passage 91, then by wireway 22 air-flow introduced the comb air admission hole 21 on oar gusset plate 3, the air-flow sprayed from comb air admission hole 21 just enters the first above-mentioned spiral comb mechanism 4, form upper and lower two strands of spiral air flows, the air-flow shutoff ring-type rotary gap of downward screw, stop the intrusion of sleet Dual-Phrase Distribution of Gas olid or rainwater biphase gas and liquid flow, and the air-flow of upwards screw, rotary piston sealing ring 16 can be clashed into, bounce-back air-flow after shock enters the air gap between rotor, collect in stator end cabin side (namely between tower side tooth support 10 and rotor endcap 19) vertically, enter in atmospheric environment finally by the annular gap between end cap seal ring 20 and tower gusset plate 11, these can also carry out drying to the end link 17 of winding and magnetic pole 18 at the fraction of motor internal bounce-back.

(5) transducer, on-off controller and switch-control strategy

Control to more reasonably fall power-cutting switch to air supply system, power-cutting switch and net side, can transducer or checkout gear be set in wind-driven generator, to detect humidity and the/insulation status of wind-driven generator inside, thus perform the foundation controlled as on-off controller.

Particularly, the permanent magnet direct-driving aerogenerator system of the present embodiment can also comprise and is arranged near the insulation of wind power generation trough portion and/or the humidity sensor of core lamination gap location, humidity sensor is connected with on-off controller, and in this case, on-off controller may be used for following control:

Wind energy turbine set be calm or be less than incision wind speed state under, the humidity value that humidity sensor detects is judged, if humidity exceedes predetermined humidity threshold, then disconnects power-cutting switch and open net side and fall power-cutting switch, and start air supply system;

Under being in the state of generating electricity by way of merging two or more grid systems at wind-driven generator, the humidity value that humidity sensor detects being judged, if humidity exceedes predetermined humidity threshold, then starts air supply system.

In addition, permanent magnet direct-driving aerogenerator system can also comprise and is arranged near the insulation of wind power generation trough portion and/or the insulation resistance value measurement mechanism of core lamination gap location, insulation resistance value measurement mechanism is connected with on-off controller, in this case, on-off controller can also be used for following control:

Wind energy turbine set be calm or be less than incision wind speed state under, the insulating resistance value that insulation resistance value measurement mechanism detects is judged, if insulating resistance value is lower than predetermined insulation resistance standard value, then disconnects power-cutting switch and open net side and fall power-cutting switch, and start air supply system;

Under being in the state of generating electricity by way of merging two or more grid systems at wind-driven generator, the insulating resistance value that insulation resistance value measurement mechanism detects being judged, if insulating resistance value is lower than predetermined insulation resistance standard value, then starts air supply system.

It should be noted that, above-mentioned humidity sensor and insulation resistance value measurement mechanism can exist simultaneously also only can arrange one of them, correspondingly, when arranging humidity sensor and insulation values measurement mechanism at the same time, the control strategy of on-off controller can be the combination of above-mentioned two situations.

Embodiment two

On the basis of embodiment one, the stator of the present embodiment is also provided with spiral comb mechanism on the tower gusset plate of tower side.Particularly, as shown in Figure 6 and Figure 7, Fig. 6 is the stator structure schematic diagram of the permanent magnet direct-driving aerogenerator of the embodiment of the present invention two, and Fig. 7 is the partial structurtes schematic diagram of Fig. 6.In tower side upwards, stator also comprises tower side tooth support 10 and tower gusset plate 11, and tower side tooth support 10 is arranged on the tower side axial end of stator core 8, correspondingly, rotor field spider 15 also has end cap seal ring 20, between end cap seal ring 20 and tower gusset plate 11, forms annular gap.

The second spiral comb mechanism 24 is also provided with in the side of the close rotary piston sealing ring 16 of oar gusset plate 3, second spiral comb mechanism 24 on the whole ringwise, second spiral comb mechanism 24 has the second spiral comb 241, second spiral comb 241 reaches in the annulus of oar gusset plate 3 and rotary piston sealing ring 16 formation, for producing the air-flow of screw in annulus, thus build " forced draft annular barrier " in the annular gap formed between end cap sealing ring 20 and tower gusset plate 11, prevent extraneous severe air-flow from entering blower interior.

As in embodiment one introduce, by the air-flow of the first top spiral comb 41, motor gas-gap (air gap between the rotor namely on the right side of Fig. 1) will be entered, go to dry motor internal surface, and then collect in stator end cabin side (namely between tower side tooth support 10 and rotor endcap 19) vertically, enter in atmospheric environment finally by the annular gap between end cap seal ring 20 and tower gusset plate 11.The second spiral comb mechanism 24 in the present embodiment acts on this strand of air-flow, when this strand of air-flow is pooled to stator end cabin side, will discharge through the second spiral comb mechanism 24, second spiral comb mechanism 24 relies on this strand of air-flow come from oar side to produce the air-flow of screw, thus in the annular gap of tower side, build wiper seal environment.

Further, blower interior is entered in order to prevent extraneous severe air-flow better, preferably, in the sectional view of the second spiral comb, second spiral comb 241 tilts near the direction of stator support 1, thus for generation of the inclination angle of screw towards the air-flow in direction near stator support, so advantageously in resisting entering of external air flow.

Be described above two kinds of example structure, once illustrate below to air flow path overall in practical application again, as shown in Figure 8, Fig. 8 is the overall air flow path schematic diagram of the permanent magnet direct-driving aerogenerator of the embodiment of the present invention.Dry gas stream is produced by the air supply system 12 be arranged in cabin, through the gas channel of stator core 8 inside, arrive the first spiral comb mechanism 4 with bidirectional screw comb on stator coaming plate, dry gas stream is split into two-way at this, one road is towards outside motor, mineralization pressure air-flow ring-type spiral flow barrier, be used for the extraneous severe air-flow of shutoff, towards motor internal in another road direction, flow through motor gas-gap, carry the moisture (comprising the moisture overflowed from inside) on motor surface, form humid air, extrude from the second spiral comb mechanism 24 with one-way spiral comb of motor tower side.

Embodiment three

Drying control method is worked in coordination with in the sealing that the present embodiment is mainly introduced based on embodiment one and embodiment two, and it mainly carries out based on the detection of humidity and/or insulating resistance value, and according to the generating state that blower fan is in, reasonably selects control strategy.Specifically comprise:

Calm or be less than period of incision wind speed in wind energy turbine set, if humidity exceedes predetermined humidity threshold or insulating resistance value lower than insulation resistance standard value, then disconnect power-cutting switch and open net side and fall power-cutting switch, and start air supply system;

Be in the period of generating electricity by way of merging two or more grid systems at wind-driven generator, if humidity exceedes predetermined humidity threshold or insulating resistance value lower than insulation resistance standard value, then start air supply system.

Embodiment four

Drying control method is worked in coordination with in the sealing that the present embodiment is mainly introduced based on embodiment one and embodiment two, the present embodiment carries out based on the detection of humidity and/or insulating resistance value equally, and according to the generating state that blower fan is in, reasonably select control strategy, but be with embodiment three difference, the weather conditions that the present embodiment is also introduced are as reference factor.Specifically comprise:

In the snowy or rainy period, perform and process as follows:

If wind energy turbine set is calm or is less than the state of incision wind speed, then disconnect power-cutting switch and open net side and fall power-cutting switch, and start air supply system;

If wind-driven generator is in the state of generating electricity by way of merging two or more grid systems, start air supply system,

Without snow and without period of rain, perform and process as follows:

In addition, after the snowy or rainy period, described air supply system can be made to open predetermined amount of time, and then perform the above-mentioned process in the period without snow and without rain.That is, after the sleet period, need the drying process carrying out by force to wind-driven generator, avoid the accumulation of moisture.

In addition, for air supply system, after start-up, can according to the wind speed of wind energy turbine set and the/rotating speed of wind-driven generator, the pressure of air supply system output gas flow described in self-adaptative adjustment; Also can the cooling requirement of wind-driven generator, adjust the temperature of described air supply system output gas flow.

Be described above four embodiments of the present invention, introduce the important technology point of the embodiment of the present invention, other optional manner and technique effect below more on the whole:

1, in embodiments of the present invention, can air supply system be arranged in the cabin of wind turbine generator, the dry air that air supply system provides flows through female pipe multichannel and draws press-in stator support, by the iron core be fastenedly connected on generator unit stator support, in iron core, the runner of design provides enough forced drafts to generator sealing place, sets up " pressure-fired shutoff forced draft and spiral comb form annular barrier ".

2, the wiper seal that labyrinth (comb) is sealed and matched between bidirectional screw comb is combined in helixseal, and be arranged on wind-driven generator upwind ring-type gap stators side, lower wind direction annular gap place stator side arranges helixseal combination labyrinth (comb) sealing.

3, calm in wind energy turbine set or be less than the incision wind speed period and can fall power transmission from electrical network to generator by the net side inverter of generating set current transformer, now net side inverter is in rectification state, gives generator unit stator winding be used for relying on stator winding heat production to come the insulation of groove portion and the core lamination gap of dry winding through current transformer DC master row by controlled direct current.Rely on stator winding generates its own heat to come in the groove portion insulation of dry interior winding and the process in core lamination gap, need according to when in stator, moisture concentration gradient is consistent with temperature gradient direction, its moisture transmittance process speed is observed:

Moisture flow rate in stator=(the moisture current density in stator caused by moisture concentration gradient)+(the moisture transmission density caused by the temperature difference in stator)+(moisture transmission density that stator interior is caused by gas pressure difference).Namely decision is combined by three gradient moisture gradients, temperature gradient and barometric gradients.

" work in coordination with " (inventive point herein, one of collaborative dry original idea of sealing) air-flow of dry air gap of source of the gas realizing active sealing coordinates, the humid air that inner for stator winding heat production gasification " displacement " generation enters air gap is driven, vertically through tower side seal extruder motor flow direction motor external elements.Rely on the dry or independent effect relying on source of the gas dry gas stream to come dry air gap inside of the inner heat production separately of winding all not as good as they synergy, this is that (the collaborative dry original idea of sealing also comprises collaborative meaning " two ": the source of the gas air-flow as described in " 4 " has two strands, one is used for sealing, resist outside rainwater, sleet, another stock is used for dry motor internal, and be used for displacement wet gas current, what winding inside produced enters with outside).The meaning three of " working in coordination with " also refers to: require based on drying bed Synergy: (dry gas stream component is circumferentially against rotor direction of rotation in an angle to enter the dry gas stream direction of air gap and rotor motion direction shape.Like this, the speed of related movement between dry gas stream and the anticorrosion protection coating of rotor permanent magnet magnetic pole increases, and friction effect increases, and is beneficial to dry rotor magnetic pole overcoat, the requirement of ingenious use drying bed Synergy.)

4, calm in wind energy turbine set or be less than the incision wind speed period and rely on source of the gas in cabin between annular gap and labyrinth seal, produce enough air-flows, a part overflows motor outward directly to upwind, a part turns to inside, skim over air gap, to end accumulation after winding, through extruding between annular gap and labyrinth seal; A parallel in this process surperficial mass transfer dry run is in generation, dry air will realize convective mass transfer and the dry stator winding surface of heat convection on generator unit stator surface, dry generator magnetic pole overcoat (composite material), then carries steam in the lump and leaves simultaneously.What rely on is second function that the artificial wiper seal air-flow manufactured goes to play it: the insulation of groove portion and the core lamination gap of being removed dry winding by surperficial mass transfer form, dry generator magnetic pole overcoat (composite material) simultaneously, and play the effect of transmission moisture.A parallel in this process internal mass transfer dry run is simultaneously in generation, and controlled direct current is used for relying on stator winding heat production to come the insulation of groove portion and the core lamination gap of dry winding to giving generator unit stator winding by current transformer DC master row.The i.e. original idea four of " the collaborative dry sequencing control of sealing ", tide is driven in the inner controlled heat production of stator winding, pressure-tight air-flow realizes dry at surperficial convective mass transfer, completes the heat and mass drying purpose of motor stator and porous material thereof.

5, generate electricity by way of merging two or more grid systems period (stator winding is in heat production) at blower fan, and without rain without snow sequential section, can the insulation on-line equipment insulation measurement value to generator windings current according to generator determine whether to drop into for the work of pressure-tight source of the gas air-flow.At this moment " sealing " is combined labyrinth and carbon gland: spiral comb coordinates wiper seal.The i.e. original idea five (tide is driven in the inner controlled heat production of stator winding, pressure-tight air-flow realizes dry at surperficial convective mass transfer, completes the heat and mass drying purpose of motor stator and porous material thereof) of " the collaborative dry sequencing control of sealing ".

6, generate electricity by way of merging two or more grid systems period at blower fan, and without rain without snow sequential section, can determine whether to drop into for the work of pressure-tight source of the gas air-flow by the relative air humidity on-line equipment measured value current according to generator.The i.e. original idea six of " the collaborative dry sequencing control of sealing ", tide is driven in the inner controlled heat production of stator winding, pressure-tight air-flow realizes dry at surperficial convective mass transfer, completes the heat and mass drying purpose of motor stator and porous material thereof.

7, generate electricity by way of merging two or more grid systems period at blower fan, and rainy or snowy sequential section, automatically can drop into for the work of pressure-tight source of the gas air-flow according to weather forecast, go a large amount of intrusions resisting the outer rain of open type generator or snow weather sequential section wind and rain " biphase gas and liquid flow " and wind and snow " Dual-Phrase Distribution of Gas olid ".At this moment " sealing " is combined labyrinth and carbon gland: spiral comb combination pressure seals.The i.e. original idea seven of " the collaborative dry sequencing control of sealing ", tide is driven in the inner controlled heat production of stator winding, pressure-tight air-flow realizes dry at surperficial convective mass transfer, completes the heat and mass drying purpose of motor stator and porous material thereof.

8, after rain or snowy sequential section, no matter whether wind energy turbine set has wind, all drops into and is used for the work of pressure-tight source of the gas air-flow.Making time length must compare the insulation measurement value of generator windings and insulation resistance acceptance value according to the insulation on-line equipment that generator is current.The i.e. original idea eight of " the collaborative dry sequencing control of sealing ", time calm, still relies on current transformer DC master row to be used for relying on stator winding heat production to come the insulation of groove portion and the core lamination gap of dry winding to giving generator unit stator winding by controlled direct current; Tide is driven in the inner controlled heat production of stator winding, pressure-tight air-flow realizes dry at surperficial convective mass transfer, completes the heat and mass drying purpose of motor stator and porous material thereof.

9, pressure-tight source of the gas air-flow operating pressure can also be used for according to current wind farm wind velocity or generator speed " self adaptation " adjustment, ensure while saving source of the gas source power to resist the effect that the upwind air stream carrying rain or snow reaches " sealing " motor internal.

10, sealing forced draft temperature can adjust from source of the gas, during to adapt to forced draft work, to the requirement of motor internal cooling, realize the object of " cool drying ", the original idea six of " the collaborative dry sequencing control of sealing ", do not affect the normal cooling of motor, shown in Figure 10 and Figure 11, wind-driven generator has natural axial cooling duct, and what arrow represented carrys out flow path direction, wherein as shown in figure 11, natural cooling duct is positioned at the rear of core on stator support.

The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.

Claims

1. a permanent magnet direct-driving aerogenerator system, comprise wind-driven generator and current transformer, described current transformer comprises rectification unit, DC master row and inversion unit, described inversion unit is connected with electrical network, the first transmission line between described rectification unit and described wind-driven generator is provided with power-cutting switch, described permanent magnet direct-driving aerogenerator comprises stators and rotators

It is characterized in that, also comprise air supply system, power-cutting switch, on-off controller and jet flow sealing device are fallen in net side, wherein,

Described air supply system and described first pore UNICOM;

2. permanent magnet direct-driving aerogenerator system according to claim 1, it is characterized in that, also comprise and be arranged near the insulation of described wind power generation trough portion and/or the humidity sensor of core lamination gap location, described humidity sensor is connected with described on-off controller

Described on-off controller, for:

3. permanent magnet direct-driving aerogenerator system according to claim 1, it is characterized in that, also comprise and be arranged near the insulation of described wind power generation trough portion and/or the insulation resistance value measurement mechanism of core lamination gap location, described insulation values measurement mechanism is connected with described on-off controller

Described on-off controller, for:

4. permanent magnet direct-driving aerogenerator system according to claim 1, is characterized in that,

Described jet flow sealing device is the first spiral comb mechanism,

5. permanent magnet direct-driving aerogenerator system according to claim 4, is characterized in that, the hand of spiral of described first top spiral comb and described first lower part helical comb is contrary.

6. permanent magnet direct-driving aerogenerator system according to claim 5, is characterized in that, the hand of spiral of described first top spiral comb is identical with the direction of rotation of rotor.

7. permanent magnet direct-driving aerogenerator system according to claim 4, is characterized in that, described first spiral comb also comprise first in the middle part of comb;

8. permanent magnet direct-driving aerogenerator system according to claim 4, it is characterized in that, described stator also comprises tower side tooth support and tower gusset plate, and described tower side tooth support is arranged on the tower side axial end of described stator core, described rotor also has end cap seal ring

9. permanent magnet direct-driving aerogenerator system according to claim 8, it is characterized in that, in the sectional view of described second spiral comb, described second spiral comb tilts near the direction of stator support, for generation of the inclination angle of screw towards the air-flow in direction near stator support.

10. permanent magnet direct-driving aerogenerator system according to claim 4, it is characterized in that, connect by ringwise wireway is corresponding on the whole between described comb air admission hole with described second pore, or connect by air ducts separated from one another is corresponding between described comb air admission hole with described second pore.

11. according to the arbitrary described permanent magnet direct-driving aerogenerator system of claim 1 to 10, it is characterized in that, the periphery wall of described stator support is fixed with punching retainingf key, the dovetail groove of described stator core is set on described punching retainingf key, and described gas channel is through described punching retainingf key and described first pore UNICOM.

12. permanent magnet direct-driving aerogenerator systems according to claim 11, it is characterized in that, described gas channel comprises radial air flow passage and axial flow passage, described radial air flow passage passes the inside of described punching retainingf key and described stator core, one end of described radial air flow passage is connected with described first pore, the other end and described axial flow expanding channels, described axial flow passage passes axially through the inside of described stator core and described second pore UNICOM.

13. permanent magnet direct-driving aerogenerator systems according to claim 12, it is characterized in that, described first pore, described second pore and described gas channel is multiple and quantity is equal, circumferentially impartial setting, the corresponding UNICOM of multiple described first pore, described second pore and described gas channel, forms many current paths independently from the periphery wall of described stator support to described oar side tooth support.

14. permanent magnet direct-driving aerogenerator systems according to claim 1, is characterized in that, described air supply system comprises the gas source generator of the air-flow producing predetermined pressure and described air-flow carried out to the air supply processing equipment of gas source purification and dry process.

15. permanent magnet direct-driving aerogenerator systems according to claim 14, is characterized in that, described gas source generator is air compressor, and described air supply processing equipment comprises air cleaner, cooler, oil water separator and drier.

Drying control method is worked in coordination with in the sealing of 16. 1 kinds of permanent magnet direct-driving aerogenerator systems, it is characterized in that, the method is carried out based on the arbitrary described permanent magnet direct-driving aerogenerator system of the claims 1 to 15, and it comprises:

Drying control method is worked in coordination with in the sealing of 17. 1 kinds of permanent magnet direct-driving aerogenerator systems, it is characterized in that, the method is carried out based on the arbitrary described permanent magnet direct-driving aerogenerator system of the claims 1 to 15, and it comprises: in the snowy or rainy period, performs and processes as follows:

Without snow and without period of rain, perform and process as follows:

Drying control method is worked in coordination with in the sealing of 18. permanent magnet direct-driving aerogenerator systems according to claim 17, it is characterized in that, after the snowy or rainy period, after making described air supply system open predetermined amount of time, then perform the above-mentioned process in the period without snow and without rain.

Drying control method is worked in coordination with in the sealing of 19. permanent magnet direct-driving aerogenerator systems according to claim 17, it is characterized in that, after the described air supply system of startup, according to the wind speed of wind energy turbine set and the rotating speed of/wind-driven generator, the pressure of air supply system output gas flow described in self-adaptative adjustment.

Drying control method is worked in coordination with in the sealing of 20. permanent magnet direct-driving aerogenerator systems according to claim 17, it is characterized in that, after the described air supply system of startup, according to the cooling requirement of wind-driven generator, adjusts the temperature of described air supply system output gas flow.