WO2013097414A1

WO2013097414A1 - Temperature regulating system for wind generator set

Info

Publication number: WO2013097414A1
Application number: PCT/CN2012/076494
Authority: WO
Inventors: 章玮
Original assignee: 江苏新誉重工科技有限公司; 新誉集团有限公司
Priority date: 2011-12-31
Filing date: 2012-06-06
Publication date: 2013-07-04
Also published as: CN103184984A

Abstract

A temperature regulating system for a wind generator set comprises: a hub (1-1), a main shaft (2-1), a generator external rotor (1) integrally formed with the hub (1-1), a generator stator (2) integrally formed with the main shaft (2-1), a blade (3) connected to the hub (1-1), and a cabin (4) that can be sealed and thermally insulated. A motor cavity formed between the generator stator (2) and the generator external rotor (1) is in communication with a blade cavity, and a ventilator (3-1) capable of sucking the gas from the motor cavity to the blade cavity is disposed on the blade (3). A stator coil (2-2) in the generator stator (2) is formed by winding a hollow wire, and the hollow wire is filled with a flowable cooling medium for cooling the generator. The heat energy produced in the running of the generator is used to heat the blades, the variable pitch mechanism and the inside of the cabin, thereby preventing the blade surface from icing; and heat dissipation is achieved by using the blades in extremely hot weather.

Description

Description Wind turbine generator temperature regulation system

Technical field

The invention relates to a temperature regulating system for a wind power generator set, in particular to a temperature regulating system for a wind power generating set with high and low temperature resistance.

Background technique

Standard wind turbines operate from a temperature range of 20 ° C to +50 ° C. In the desert Gobi area, the ambient temperature varies greatly, and the operating temperature range is required to reach 40 ° C to + 70 ° C _; Wind turbines operating in the cold season of the region must have the ability to work normally in low temperature environments. Usually low temperature units should be able to operate at 30 ° C, the temperature is 45 ° C, and the ultra low temperature can be Working at 45 ° C, the temperature of survival is 55 ° C.

Wind turbines operate at low temperatures, and many technical problems arise. One of the problems that must be solved is to prevent the blade from freezing and to maintain the working environment temperature of the pitch system.

Due to the winter fog in the severe cold area, the snow is heavy, the air humidity is high, and it is easy to be saturated. When the temperature is below 20 °C, the so-called "haze" phenomenon is likely to occur, and the surface of the blade will "crystallize", sometimes even on the surface of the blade. Regular ice icing increases the surface roughness of the blade or causes the blade airfoil to change, reducing the aerodynamic performance of the airfoil and thereby reducing the wind turbine power. If the front edge of the blade is attached with a lot of ice, it will seriously affect the output power of the fan and cannot reach the rated power. When the wind speed exceeds the rated value, the wind turbine will have an irregular transient vibration phenomenon, which will affect the service life of the blade and the normal power generation of the unit. Crystallized ice on the surface of the blade caused by high humidity and low temperature may also cause uneven load on the wind wheel, affecting the power of the wind wheel and even causing damage to the wind turbine. In addition, the ice ice attached to the surface of the wind turbine blade may fly out due to the centrifugal force. If the wind turbine is located near an off-street road or residential area, or the arrangement of the wind turbine and the on-site maintenance road is unreasonable, the ice blast will not only affect the surrounding wind turbines and substations. Description

The station poses a serious threat and may also cause pedestrians and vehicles to be injured, with very serious consequences.

The method of preventing icing of the blades can now only be solved by adding electric heat insulation inside the blades, heating with hot air or special treatment in the characteristic areas of the blades.

The prior invention patent CN00809348. 2 "Wind turbine blade with deicing and lightning protection" proposes a technical solution in which two conductors are arranged in the longitudinal direction of the blade and connected to the heating element, the two conductors are in the fan When encountering lightning, it can also become a conductor for accessing the ground wire; but to prevent the blades from freezing, the heating elements must be sufficiently large, and the energy consumed is huge, which will inevitably greatly increase the operating cost of the wind turbine. And greatly reduce the operating efficiency of the unit.

The technical proposal of the "anti-icing system for wind equipment" of the prior invention patent CN200380101511. 2 is that a channel for transmitting hot air is provided on the blade to maintain a certain temperature at a portion where the blade is easy to freeze. This technical solution may cause a large amount of heat loss during the process of conveying hot air, and it is very difficult for such a large structural member such as a blade to be ice-free by such a heating device.

In addition to this, since the pitch mechanism is usually mounted in the hub, the working environment is much worse than the other components of the unit. Moreover, the pitch mechanism is a relatively independent system of mechatronics, including the control system and the actuator. The actuator is composed of a servo motor, a reduction gear, a pitch gear, a battery or a super capacitor. In order for the pitch mechanism to work properly, it should be ensured that the ambient temperature of its working is not lower than 20 °C, otherwise the servo motor will be difficult to start, screaming and rapid wear of the bearing; the battery will not work properly, and the reduction gear will appear high. Friction loss, material embrittlement; problems such as freezing of lubricant.

In addition to the addition of warming devices, no more technical solutions have been proposed to maintain the operating ambient temperature of the pitching mechanism.

Summary of the invention Description

The technical problem to be solved by the present invention is: To overcome the deficiencies of the prior art, a temperature regulating system for a wind power generator set is provided, which uses the heat energy generated by the wind power generator during operation to warm the blade and the pitching mechanism.

The technical solution adopted by the present invention to solve the technical problem thereof is: a temperature regulation system for a wind power generator, comprising a hub, a main shaft, a generator outer rotor integrated with the wheel hub, a generator stator integrated with the main shaft, and a blade connected to the hub and a nacelle having a sealable heat insulation, the motor cavity formed between the generator stator and the outer rotor of the generator is in communication with the blade cavity, and the blade is provided with a gas that can draw the gas in the motor cavity into the blade a fan in the cavity; the stator coil in the stator of the generator is wound by a hollow wire, the hollow wire is in communication with a liquid cooling system, and the hollow wire has a flowable cooling generator Cooling medium.

Further, the liquid cooling system includes a pump, a radiator, and a heat exchange device, and the hollow wire of the stator coil is in communication with a pump, a radiator, and a heat exchange device.

Further, the hub has an air supply port and a return air port that face the cavity of the blade and communicate with the inner cavity of the generator. The fan on the blade is connected to the air supply port and the air return port through flexible hoses.

Further, the blade cavity is provided with a blade beam, and the blade beam divides the blade cavity into a front cavity and a back cavity, and the front cavity and the back cavity are in a communicating structure at the tip end.

Further, the inlet of the radiator is provided with a first electric width regulating the flow of the cooling medium into the radiator, and the inlet of the heat exchange device is provided with a second electric valve for regulating the flow of the cooling medium into the heat exchange device.

Further, a filter screen is disposed on the air outlet of the hub and the diameter of the air return port, and the inner ring of the hub is mounted with a pitch mechanism.

Further, when the ambient temperature is between + 1 CTC and +5 CTC, the liquid cooling system injects the cooling medium. Description

In the hollow wire of the sub-coil (2-2), the liquid cooling system exchanges heat with the outside.

Further, when the ambient temperature is between 10 ° C and 10 ° C, the liquid cooling system injects the cooling medium into the hollow wire of the stator coil, and the liquid cooling system exchanges heat with the outside, the fan is turned on, and the fan will generate electricity. The air in the inner cavity of the machine is discharged into the blade, and the air is sent back from the blade to the inner cavity of the generator to cool down by the heat conduction of the blade.

Further, when the outside temperature is lower than 10 ° C, the liquid cooling system is turned off, the fan is turned on, the fan discharges the air in the inner cavity of the generator into the blade, and the air is sent back from the blade to the inner cavity of the generator. The blade is heated by the heat in the inner cavity of the generator.

Further, when the outside temperature is higher than + 50 ° C, the liquid cooling system injects the cooling medium into the hollow wire of the stator coil, and the liquid cooling system exchanges heat with the outside, the fan is turned on, and the fan opens the generator cavity. The air in the air is discharged into the blades, and the air is sent back from the blades back into the inner cavity of the generator, and the blades are used as a heat exchange element to lower the temperature inside the generator.

The invention has the advantages that: the structure of the hub and the outer rotor of the generator is integrated, so that the blade can communicate with the inner cavity of the generator, and the liquid medium in the generator is arranged to cool the stator coil. And two sets of cooling devices for cooling the air cooling on the surface of the rotor winding and the stator core. Under the action of the liquid cooling system, the present invention can fully utilize the heat generated by the generator during operation to the blade and the pitch. The interior of the mechanism and the cabin are heated to ensure that the systems operate at the appropriate ambient temperature to a certain extent to avoid icing on the surface of the blade.

DRAWINGS

The invention will now be further described with reference to the accompanying drawings.

Figure 1 is a schematic view of the structure of the present invention;

Figure 2 is a layout view of the air inlet and return air ports of the hub of the present invention; Instruction manual

Figure 3 is a schematic view of the blade structure and the fan arrangement of the present invention; Figure 4 is a schematic view of the hot air circulation of the blade inner cavity of the present invention;

Among them: 1. Generator outer rotor, 1-1. Wheel hub, 1-2. Air supply port, 1-3. Air return port, 1-4. Filter screen, 2. Generator stator, 2-1. Spindle, 2- 2. Stator coil, 2-3. Pump, 2-4. Flexible hose, 3. Blade, 3-1. Fan, 3-2. Front cavity, 3-3. Back cavity, 3-4. Blade beam , 4. Engine room, 4-3. Radiator, 4-3-1. First electric valve, 4-4. Heat exchange unit, 4-4-1. Second electric wide, 5 pitch mechanism.

detailed description

As shown in Figure 1, a temperature regulation system for a wind turbine includes a hub i-i, a spindle

2-1. Generator outer rotor 1 integrated with the hub 1-1, generator stator 2 integrated with the main shaft 2-1, blades 3 connected to the hub 1-1, and a nacelle with sealable insulation 4. A pitching mechanism 5 mounted on the inner circumference of the hub 1-1.

The motor cavity formed between the generator stator 2 and the generator outer rotor 1 communicates with the vane cavity, and the vane 3 is provided with a fan 3-1 for drawing gas from the motor cavity into the vane cavity.

The stator coil 2-2 in the generator stator 2 is wound by a hollow conductor which is in communication with a liquid cooling system having a flowable cooling medium for cooling the generator. The liquid cooling system includes a pump 2-3, a radiator 4-3 and a heat exchange device 4-4, a hollow wire of the stator coil 2-2 and a pump 2-3, a radiator 4-3, and a heat exchange device 4-4. The same. The first electric valve 4-3-1 for regulating the flow rate of the cooling medium into the radiator 4-3 is disposed at the inlet of the radiator 4-3, and the inlet of the heat exchange device 4-4 is provided with the regulating cooling medium to enter the heat exchange device 4 -4 flow of the second electric wide 4-4-1. As shown in FIG. 2 and FIG. 4, the hub 1-1 is integrated with the outer rotor 1 of the generator, and the blade 3 is directly mounted. Description

On the outer rotor 1 of the generator, a position where the pitch mechanism 5 is mounted is left on the hub 1-1, and the air inlet 1-2 and the air return opening facing the blade cavity and communicating with the inner cavity of the generator are provided on the hub 1-1. 1-3, the fan 3-1 on the blade 3 is connected to the air supply port 1-2 and the air return port 1-3 through flexible hoses 2-4, respectively. The air supply port 1-2 and the air return port 1-3 on the hub 1-1 are connected to the inner cavity of the generator, and the air filter port 1-2 and the air return port 1-3 of the hub 1-1 are provided with a filter screen 1 - 4. The chipping generated inside the blade cavity can be blocked and adsorbed, and the filter can be cleaned or replaced regularly to prevent debris from entering the generator.

As shown in Fig. 3 and Fig. 4, the blade beam is provided with a blade beam 3-4, and the blade beam 3-4 divides the blade cavity into the front cavity 3-2 and the rear cavity 3-3, the front cavity 3-2 and the rear. The cavity 3-3 is a communicating structure at the tip end. The fan 3_ 1 is mounted on the ribs of the front chamber 3-2 and the rear chamber 3-3 of the blade 3.

As shown in Fig. 4, the fan 3-1 can discharge the air in the inner cavity of the generator from the air supply port 1-2 into the front cavity 3-2 of the blade 3, and pass the air in the rear cavity 3-3 of the blade 3 The return air 1-3 is sent back to the inner cavity of the generator.

Since the pitch mechanism 5 is disposed on the inner ring of the hub 1-1, the heat generated by the generator during operation can maintain the temperature of the inner circumference of the hub 1-1 by heat conduction or radiation, thereby avoiding the work of the pitch mechanism 5. The ambient temperature is below the allowable value.

The arrows in Figures 1 and 4 are the direction of air flow. When the ambient temperature is between + 1 CTC and + 50 ° C, the pump 2-3 injects the cooling medium into the hollow wire of the stator coil 2-2, and then dissipates heat. The heat exchanger 4-3 and the heat exchange device 4-4 exchange heat with the outside.

When the outside temperature is higher than +50 ° C, the cooling medium is injected into the hollow wire of the stator coil 2-2 through the pump 2-3, and the heat exchange is performed with the outside through the heat sink 4-3 and the heat exchange device 4-4. The fan 3-1 is turned on, and the fan 3-1 discharges the air in the inner cavity of the generator from the air supply port 1-2 into the front cavity 3-2 of the blade 3, and then sends it from the rear cavity 3-3 of the blade 3. Returning to the inner cavity of the generator, using the blade 3 as a heat Description

The components are replaced by heat conduction and heat radiation from the blades 3 to reduce the temperature inside the generator.

When the outside temperature is between +10 ° C and -10 ° C, the cooling medium is still injected into the hollow wire of the stator coil 2-2 through the pump 2-3, through the heat sink 4-3 and the heat exchange device 4-4 and the outside While performing heat exchange, the fan 3-1 is turned on, and the fan 3-1 discharges the air in the inner cavity of the generator from the air supply port 1-2 into the front cavity 3-2 of the blade 3, and then from the rear cavity of the blade 3. In 3-3, it is sent back to the inner cavity of the generator, and the inner cavity of the blade 3 is heated by the heat conduction of the blade 3.

When the outside temperature is lower than -10 °C, the pump 2-3 is turned off, the fan 3-1 is turned on, and the fan 3-1 discharges the air in the inner cavity of the generator from the air supply port 1-2 into the front cavity of the blade 3. 3-2, and then sent back to the inner cavity of the generator from the rear chamber 3-3 of the blade 3, and the blade 3 is heated by the heat in the inner cavity of the generator.

In view of the above-described embodiments of the present invention, various changes and modifications may be made by those skilled in the art without departing from the scope of the invention. The technical scope of the present invention is not limited to the contents of the specification, and the technical scope thereof must be determined in accordance with the scope of the claims.

Claims

Claim

A temperature regulating system for a wind power generator, comprising: a hub (1-1), a main shaft (2-1), a generator outer rotor (1) integrated with the hub (1-1), a generator stator (2) integrated with a main shaft (2-1), a vane (3) connected to the hub (1-1), and a nacelle (4) having a sealable heat insulation, the generator stator ( 2) The motor cavity formed between the outer rotor (1) of the generator is in communication with the cavity of the blade, and a fan (3) is provided on the blade (3) for drawing the gas in the cavity of the motor into the cavity of the blade (3) -1); the stator coil (2-2) in the generator stator (2) is wound by a hollow wire, the hollow wire is in communication with a liquid cooling system, and the hollow wire has flowable Cooling medium for cooling the generator.

2. The temperature regulating system for a wind power generator according to claim 1, wherein: said liquid cooling system comprises a pump (2-3), a radiator (4-3), and a heat exchange device (4-4). The hollow wire of the stator coil (2-2) is in communication with the pump (2-3), the radiator (4-3), and the heat exchange device (4-4).

3. The temperature regulating system for a wind power generator set according to claim 1, wherein: said hub (1-1) has an air supply opening facing the blade cavity and communicating with the inner cavity of the generator (1-2) And the air return port (1-3), the fan (3-1) on the blade (3) and the air supply port (1-2) and the return air port (1-3) respectively pass through the flexible hose (2-4) ) connected.

The temperature regulating system for a wind power generator according to claim 1 or 3, wherein: said blade cavity is provided with a blade beam (3-4), and said blade beam (3-4) The blade cavity is divided into a front cavity (3-2) and a rear cavity (3-3), and the front cavity (3-2) and the rear cavity (3-3) are in a communicating structure at the tip end.

The temperature regulating system for a wind power generator according to claim 2, wherein: the inlet of the radiator (4-3) is provided with a flow regulating the flow of the cooling medium into the radiator (4-3) An electric wide (4-3-1), the inlet of the heat exchange unit (4-4) is provided with an adjustment cooling medium to enter the heat exchange Claim

Device (4-4) Second electric valve for flow (4-4-1).

The temperature regulation system for a wind power generator set according to claim 3, characterized in that: the air outlet (1-2) and the air return opening (1-3) of the hub (1-1) are provided with a diameter There is a sieve (1-4), and the inner ring of the hub (1-1) is provided with a pitch mechanism (5).

7. A control method for controlling a temperature regulation system of a wind power generator according to claim 1, wherein: when the ambient temperature is between +1 CTC and +5 CTC, the liquid cooling system injects a cooling medium into the stator coil (2-2) In the hollow wire, the liquid cooling system exchanges heat with the outside.

8. A control method for controlling a temperature regulation system of a wind power generator according to claim 1, wherein: when the ambient temperature is between 10 ° C and 10 ° C, the liquid cooling system injects the cooling medium into the stator coil ( In the hollow conductor of 2-2), while the liquid cooling system exchanges heat with the outside, the ventilator (3-1) is turned on, and the ventilator (3-1) discharges the air in the inner cavity of the generator into the blade (3) The air is then sent back from the blade (3) back into the interior of the generator and cooled by the heat transfer from the blade (3).

9. A control method for controlling a temperature regulation system of a wind power generator according to claim 1, wherein: when the outside temperature is lower than a temperature of 10 ° C, the liquid cooling system is turned off, and the fan (3-1) is turned on. , the fan (3-1) discharges the air in the inner cavity of the generator into the blade (3), and the air is sent back from the blade (3) back into the inner cavity of the generator through the heat in the inner cavity of the generator. (3) Perform heating.

10. A control method for controlling a temperature regulation system of a wind power generator according to claim 1, wherein: when the ambient temperature is higher than +50 ° C, the liquid cooling system injects the cooling medium into the stator coil

In the hollow conductor of (2-2), while the liquid cooling system exchanges heat with the outside, the ventilator (3-1) is turned on, and the ventilator (3-1) discharges the air in the inner cavity of the generator into the blade (3) ), the air is sent back from the blade (3) back into the generator cavity, and the blade (3) is used as a heat exchange element to reduce the temperature inside the generator.