CN210780423U - Cooling system for wind driven generator and wind driven generator set - Google Patents

Abstract

The utility model relates to a cooling system and wind generating set for aerogenerator, cooling system includes a plurality of heat transfer units independent each other that radial inboard edge circumference of aerogenerator's stator was arranged, every heat transfer unit has heat transfer cavity and sets up heat exchanger in the heat transfer cavity, every heat transfer cavity has entry and export, the heat transfer cavity the entry orientation the radial inboard surface of stator is opened. By adopting the cooling system for the wind driven generator, each circumferential position of the stator of the wind driven generator can be independently cooled, and the cooling degree of each circumferential position of the stator can be controlled.

Description

Cooling system for wind driven generator and wind driven generator set

Technical Field

The utility model relates to a wind power generation technical field, more specifically relates to a wind generating set who is used for aerogenerator's cooling system and contains this cooling system.

Background

A permanent magnet direct-drive wind generating set is a device for converting wind energy into mechanical energy and then converting the mechanical energy into electric energy. In the normal operation process of the generator set, a large amount of heat can be generated by a generator system, a main transmission system and other rotating systems, so that the cooling of the generator is very important. Water-cooled systems are preferred cooling systems for large megawatt models with their good cooling performance over other cooling means, such as air cooling. For the wind driven generator, the implantation of the cooling liquid medium brings more severe test to the operating environment of the generator. Because the pipeline and the heat exchanger are arranged on the stator inside the generator, when the pipeline and the heat exchanger leak, liquid can enter the generator along the gravity direction, and at the moment, the water cooling system is difficult to monitor and detect the leakage, particularly the slight leakage. In the case of the generator, the leaked liquid inside the generator can cause the fatal consequences of winding breakdown, burnout and the like.

At present, leakage monitoring and control of most cooling systems are concentrated on the cooling systems, most of the leakage monitoring and control involve monitoring of the cooling systems such as cooling pipelines and heat dissipation structures, and direct and effective monitoring on cooled objects (such as generators) is not found yet. However, when leaks occur in the heat exchangers and pipes arranged on the stator inside the generator, the leakage points may not be effectively monitored and investigated from the cooling system itself, which poses a great risk to the generator. In addition, most of the currently applied leakage monitoring methods are applied in a single and independent manner, so that the effectiveness and the accuracy are low, and the judgment of a monitoring feedback result and the response control of a unit are lacked.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned problem that exists among the prior art, the utility model aims at providing a can in time monitor aerogenerator inside cooling liquid effectively and can accurately judge the cooling system who is used for aerogenerator of leakage position and including this cooling system's wind generating set.

According to an aspect of the utility model, a cooling system for aerogenerator is provided, cooling system includes a plurality of heat transfer units independent each other that radial inboard edge circumference of aerogenerator's stator was arranged, every heat transfer unit has heat transfer cavity and sets up heat exchanger in the heat transfer cavity, every heat transfer cavity has entry and export, heat transfer cavity the entry orientation the radial inboard surface of stator is opened.

Preferably, each heat exchange unit may include first and second radial side walls radially opposite to each other defining the heat exchange cavity, first and second axial side walls axially opposite to each other, and first and second circumferential side walls circumferentially opposite to each other, wherein the first radial side wall may be closer to the rotation axis of the wind turbine than the second radial side wall, the first axial side wall may be closer to a nacelle than the second axial side wall, the inlet may be provided on the second radial side wall, and the outlet may be provided on the first radial side wall and closer to a blade hub side.

Preferably, aerogenerator the axis of rotation can have the contained angle with the horizontal plane between, the contained angle can be greater than 0 and be less than 15, based on passing the axis of rotation and with the horizontal plane become the plane of contained angle, aerogenerator can be divided into and is located the top half of plane top and the bottom half that is located the plane below, cooling system can also include the leakage monitoring system, the leakage monitoring system can include a plurality of level sensor, a plurality of level sensor can include the first level sensor that is used for monitoring the leakage condition of a plurality of heat transfer unit in aerogenerator's top half and be used for monitoring the second level sensor of the leakage condition of a plurality of heat transfer unit in aerogenerator's the bottom half.

Preferably, the first liquid level sensor may be disposed in each of the plurality of heat exchange units in the upper half of the wind turbine, and the second liquid level sensor may be shared by the plurality of heat exchange units in the lower half of the wind turbine.

Preferably, the first level sensor may be disposed inside the heat exchange unit and proximate to an intersection of the first radial sidewall and the first axial sidewall of the heat exchange unit to monitor for liquid accumulation leaked by heat exchangers in the heat exchange unit and accumulated at the intersection of the first radial sidewall and the first axial sidewall, and the second level sensor may be disposed outside the heat exchange unit and proximate to a location of a rotor of the wind turbine at 6 o 'clock and proximate to a nacelle to monitor for liquid accumulation leaked by heat exchangers in a plurality of heat exchange units in a lower half of the wind turbine and accumulated at the location of the rotor at 6 o' clock and proximate to the nacelle.

Preferably, the first circumferential side wall may be offset in a clockwise direction in a circumferential direction with respect to the second circumferential side wall, the first liquid level sensor may be disposed proximate to an intersection of the first radial side wall, the first axial side wall and the first circumferential side wall of the heat exchange unit for a plurality of heat exchange units between 12 o 'clock and 3 o' clock in the upper half of the wind turbine, and the first liquid level sensor may be disposed proximate to an intersection of the first radial side wall, the first axial side wall and the second circumferential side wall of the heat exchange unit for a plurality of heat exchange units between 9 o 'clock and 12 o' clock in the upper half of the wind turbine.

Preferably, the second liquid level sensor may be provided on a mounting bracket fixed to a slip ring at an axial end of the stator.

Preferably, the leakage monitoring system may further include a plurality of temperature and humidity sensors and a control unit, wherein the control unit is electrically connected to the plurality of liquid level sensors and the plurality of temperature and humidity sensors and monitors signals of the plurality of liquid level sensors and the plurality of temperature and humidity sensors.

Preferably, each heat exchange unit can be provided with a temperature and humidity sensor, and each temperature and humidity sensor can be arranged close to the outlet of the heat exchange cavity of each heat exchange unit and used for monitoring the temperature and humidity of air flowing through the outlet of the heat exchange cavity of each heat exchange unit.

Preferably, the leakage monitoring system may further include a liquid level alarm module and an abnormal temperature and humidity alarm module, the control unit may be further electrically connected to the liquid level alarm module and the abnormal temperature and humidity alarm module, and the control unit may control the alarm of the liquid level alarm module according to the monitored signals of each of the plurality of liquid level sensors and control the alarm of the abnormal temperature and humidity alarm module according to the monitored signals of each of the plurality of temperature and humidity sensors.

Preferably, the control unit may further be electrically connected to a pump start/stop switch and an electric ball valve of a pump that conveys a cooling medium to the heat exchangers in the plurality of heat exchange units, and the control unit may further control operations of the pump start/stop switch and the electric ball valve according to an alarm signal of the liquid level alarm module and/or the temperature/humidity abnormality alarm module.

According to another aspect of the present invention, there is provided a wind turbine generator system comprising the cooling system described above.

By adopting the cooling system for the wind driven generator, each circumferential position of the stator of the wind driven generator can be independently cooled, and the cooling degree of each circumferential position of the stator can be controlled.

In addition, the liquid leakage of the cooling system of the wind driven generator can be effectively monitored in time, the response is made in time, and the situation that the generator continues to operate blindly after cooling liquid is filled into the interior of the generator (for example, the cooling liquid is immersed into a winding or magnetic steel of the generator) is avoided, so that major safety accidents and economic losses such as breakdown and burnout of the generator are caused.

Drawings

Fig. 1 is a schematic cross-sectional view illustrating a wind turbine generator set including a cooling system according to an exemplary embodiment of the present invention;

fig. 2 is a schematic axial cross-sectional view showing a wind turbine comprising a cooling system according to an exemplary embodiment of the present invention;

fig. 3 is a schematic diagram illustrating a mounting position of a second liquid level sensor according to an exemplary embodiment of the present invention; and

fig. 4 is a schematic diagram illustrating a leak monitoring system according to an exemplary embodiment of the present invention.

Description of reference numerals:

1-a wind power generator; 2-a cabin; 4-a stator support; 6-a rotor; 7-a stator; 9-a slip ring; 11-a first level sensor; 12-a second liquid level sensor; 20-a temperature and humidity sensor; 14-a mounting bracket; 30-a heat exchanger; 31-a pipeline; 32-a blower; 40-a heat exchange unit; 41-a first radial sidewall; 42-a second radial sidewall; 43-a first axial sidewall; 44-a second axial sidewall; 45-a first circumferential sidewall; 46-a second circumferential side wall; 47-inlet; 48-an outlet; 60-a control unit; 61-liquid level alarm module; 62-temperature and humidity abnormity alarm module; 63-pump start-stop switch; 64-an electric ball valve; 70-master control system.

Detailed Description

In order to better understand the technical idea of the present invention for those skilled in the art, the following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings, in which like reference numerals refer to like parts throughout.

As shown in fig. 1, the wind turbine generator system includes a wind turbine generator 1 and a nacelle 2, and the wind turbine generator 1 includes a stator 7 and a rotor 6, and a stator bracket 4 supporting the stator 7. In the present invention, the wind power generator 1 is an inner stator/outer rotor type permanent magnet motor structure, and the magnetic steel is laid on the surface of the rotor 6.

Further, when assembling the wind turbine generator set, the wind turbine generator 1 is made to have an elevation angle α between the rotation axis of the wind turbine generator 1 and the horizontal plane, and the angle α is greater than 0 ° and less than 15 °.

Generally, the main reason that the permanent magnet direct-drive wind driven generator needs to dissipate heat is that eddy current loss generates a large amount of heat loss in the generator, and when the temperature is higher than 120 ℃ due to the heat loss, irreversible demagnetization of the permanent magnet can be caused, so that magnetic steel in the generator needs to be circularly cooled.

In the present invention, as shown in fig. 1 and 2, the cooling system for a wind power generator includes a plurality of heat exchange units 40 arranged circumferentially inside a stator 7 of the wind power generator 1, each of the heat exchange units 40 having a heat exchange cavity and a heat exchanger 30 disposed in the heat exchange cavity, for example, the heat exchanger 30 may be an air-water heat exchanger having passages for allowing a gas (for example, air) and a liquid cooling medium to pass therethrough, respectively, for example, the heat exchanger 30 may have a honeycomb duct structure, or a fin-and-tube heat exchanger, the liquid cooling medium flows through the inside of the duct, and the gas passes through gaps between the ducts at the outside of the duct.

Each heat exchange cavity has an inlet 47 and an outlet 48, the inlet 47 being openable towards the stator 7 to receive a flow of air heated through the air duct in the stator 7. The heat exchanger 30 may be arranged facing the inlet 47, preferably close to the inlet 47, or at the inlet 47. The heat exchanger 30 may be connected to the cooling medium supply circuit by a line 31 (e.g., including a water inlet line and an outlet line). Furthermore, each heat exchanging unit 40 may further comprise a blower 32 for blowing or sucking air flowing and flowing through the heat exchanging cavity, as shown in fig. 1, the blower 32 may be arranged on the stator frame 4 of the wind turbine generator 1 near the outside of the outlet 48 of the heat exchanging cavity, where the blower 32 may be used for sucking air near the outlet 48 of the heat exchanging cavity so that hot air flow near the heat generating components (e.g. windings and magnetic steel) driving the stator and rotor of the generator enters the heat exchanging cavity via the inlet 47 of the heat exchanging cavity and passes the hot air flow through the heat exchanger 30 arranged in the heat exchanging cavity to be cooled, and the cooled air flow exits the heat exchanging cavity via the outlet 48 and is further re-supplemented into the magnetic steel through other flow paths (not shown). The hollow arrows of fig. 1 and 2 schematically show the flow path of the air flow. Meanwhile, the heat of the hot air passing through the heat exchanger 30 is absorbed by the cold source medium (or called as cooling medium) in the heat exchanger 30 and is discharged to the outside of the generator through the water outlet connected to the heat exchanger 30, and meanwhile, the cold source medium is replenished into the water inlet of the heat exchanger 30 to continue absorbing the heat. Thus realizing continuous circulation cooling inside the generator.

As shown in fig. 2, the plurality of heat exchange units 40 arranged in the circumferential direction inside the stator 7 in the radial direction are independent of each other, and have independent heat exchange cavities, heat exchangers 30, and blowers 32. Further, as needed, the plurality of heat exchange units 40 may be symmetrically or asymmetrically arranged in the circumferential direction, as shown in fig. 2, 8 heat exchange units 40 are arranged along the circumferential direction of the generator in a vertically symmetrical, horizontally symmetrical or centrally symmetrical manner. This makes it possible to independently cool each circumferential position of the stator 7 of the wind turbine generator 1, and further, to control the degree of cooling at each circumferential position of the stator 7, thereby achieving symmetrical or asymmetrical cooling of the stator 7. In addition, each heat exchange unit 40 is independent of the other to facilitate leakage monitoring as will be described below, e.g., leakage in each heat exchange unit 40 can be accurately monitored and troubleshooting or maintenance can be performed individually.

As shown in fig. 1 and 2, each heat exchange unit 40 may include first and second radial sidewalls 41 and 42 that are diametrically opposed to each other, first and second axial sidewalls 43 and 44 that are axially opposed to each other, and first and second circumferential sidewalls 45 and 46 that are circumferentially opposed to each other, defining a heat exchange cavity. The first radial sidewall 41 may be closer to the rotation axis of the wind turbine 1 than the second radial sidewall 42, that is, the first radial sidewall 41 is a radially inner sidewall, and the second radial sidewall 42 is a radially outer sidewall. The inlet 47 may be provided on the second radial sidewall 42 and the outlet 48 may be provided on the first radial sidewall 41 near the hub side of the blade of the wind park. The area of the inlet 47 may be larger than the area of the outlet 48.

In order to increase the contact area of the heat exchanger 30 with the gas flow, the opening area of the inlet 47 is as large as possible, so that the radially inner side surface of the stator 7 is more exposed to the heat exchange cavity, so that the heat exchanger 30 faces the radially inner side surface of the stator 7 with a larger area, so that the gas flow passing through the stator 7 flows through the heat exchanger 30 with a larger gas flow cross-sectional area. Therefore, the width of the second radial sidewall 42 at the outer periphery of the inlet 47 is smaller than the width of the portion of the first radial sidewall 41 at the outer periphery of the outlet 48. As a preferred embodiment, the heat exchanger 30 may be provided on the inlet 47, supported by the second radial sidewall 42.

Furthermore, the first axial side wall 43 may be closer to the nacelle 2 than the second axial side wall 44, i.e. the first axial side wall 43 is closer to the nacelle 2 and the second axial side wall 44 is closer to the blade hub (not labeled). In addition, the first circumferential side wall 45 may be offset in the circumferential direction in the clockwise direction with respect to the second circumferential side wall 46.

Each heat exchanging unit 40 may be arranged on the stator frame 4 and remain stationary during operation of the generator.

During the normal operation of the wind turbine generator system, under the influence of gravity, once leakage occurs, the leaked liquid in the heat exchanger 30 or the pipeline 31 of each heat exchange unit 40 flows downwards, and therefore, the flow path of the leaked liquid of each heat exchange unit 40 is different.

In particular, based on a plane passing through the axis of rotation of the wind turbine 1 and at the above-mentioned elevation angle to the horizontal, the wind turbine 1 may be divided into an upper half located above said plane and a lower half located below said plane, it can be seen particularly clearly from FIG. 1 that, for each heat exchange unit 40 in the upper half of the wind turbine 1, leakage will move downwards and fall on the first radial side wall 41 (i.e. the radially inner side wall) of the heat exchange unit 40 upon leakage, furthermore, due to the presence of the upward elevation angle α of the wind turbine 1, leakage in each heat exchange unit 40 will collect inside the heat exchange unit 40 at the intersection of the first radial side wall 41 and the first axial side wall 43, as in position III in FIG. 1. during operation of the generator, the respective side walls of the heat exchange unit 40 will not rotate, and leakage will collect continuously at position III of the respective heat exchange unit.

More specifically, as shown in fig. 2, for the plurality of heat exchange units 40 located between 12 o 'clock and 3 o' clock in the upper half of the wind turbine 1, the first circumferential side wall 45 is located lower in the direction of gravity with respect to the second circumferential side wall 46, and therefore, for the plurality of heat exchange units 40 located between 12 o 'clock and 3 o' clock, the leakage in each heat exchange unit 40 will be collected inside the heat exchange unit 40 at the intersection of the first radial side wall 41, the first axial side wall 43 and the first circumferential side wall 45. Whereas for a plurality of heat exchange units 40 between 9 o 'clock and 12 o' clock in the upper half of the wind turbine 1, the second circumferential side wall 46 is gravitationally lower relative to the first circumferential side wall 45, so that for a plurality of heat exchange units 40 between 9 o 'clock and 12 o' clock, leakage in each heat exchange unit 40 will collect inside the heat exchange unit 40 at the intersection of the first radial side wall 41, the first axial side wall 43 and the second circumferential side wall 46.

Therefore, since the accumulation position of the leakage liquid of each heat exchange unit 40 in the upper half of the wind power generator 1 is different, one liquid level sensor 11 (hereinafter, will be referred to as a first liquid level sensor 11) may be installed in each heat exchange unit 40 in the upper half of the wind power generator 1 for monitoring the leakage condition of each heat exchange unit 40 in the upper half of the wind power generator 1, respectively. More specifically, the first liquid level sensor 11 may be disposed inside the heat exchange unit 40 and near the intersection of the first radial sidewall 41 and the first axial sidewall 43 of the heat exchange unit 40 (i.e., position III shown in fig. 1) to monitor the liquid loading leaked by the heat exchanger 30 in the heat exchange unit 40 and accumulated at the intersection of the first radial sidewall 41 and the first axial sidewall 43.

More preferably, the first level sensor 11 may be disposed inside the heat exchange unit 40 near the intersection of the first radial sidewall 41, the first axial sidewall 43 and the first circumferential sidewall 45 of the heat exchange unit 40 for a plurality of heat exchange units 40 between 12 o 'clock and 3 o' clock, and the first level sensor 11 may be disposed inside the heat exchange unit 40 near the intersection of the first radial sidewall 41, the first axial sidewall 43 and the second circumferential sidewall 46 of the heat exchange unit 40 for a plurality of heat exchange units 40 between 9 o 'clock and 12 o' clock.

For each heat exchange unit 40 in the lower half of the wind driven generator 1, when one or more heat exchange units 40 leak, the liquid medium will enter the windings of the stator 7 below the heat exchange unit 40 through the inlet 47 of the heat exchange unit 40 and further enter the magnetic steel of the rotor 6, and then flow downwards along the outer wall of the windings and the inner wall of the magnetic steel to the lowest point of the rotor 6 under the action of gravity, since the wind driven generator has an upward elevation angle α, finally, the leaked liquid of each heat exchange unit 40 in the lower half of the wind driven generator 1 will be gathered to the position 6 o' clock of the rotor 6 and close to the nacelle under the action of gravity, i.e. the lowest point of the liquid flow in the lower half of the wind driven generator, i.e. the position I in fig. 1.

Therefore, a liquid level sensor 12 (hereinafter, referred to as a second liquid level sensor 12) is installed at a position i of the wind power generator 1 to monitor a leakage condition of the plurality of heat exchanging units 40 of the lower half portion of the wind power generator 1. That is, the plurality of heat exchanging units 40 in the lower half of the wind power generator 1 will share one second liquid level sensor 12. More specifically, the second liquid level sensor 12 may be disposed outside the heat exchange unit 40 at a position close to 6 o 'clock of the rotor 6 of the wind turbine 1 and close to the nacelle 2 (i.e., position I shown in fig. 1) to monitor the liquid accumulated at the position close to the nacelle 2 and 6 o' clock of the rotor 6 and leaked by the heat exchangers 30 in the plurality of heat exchange units 40 in the lower half of the wind turbine 1.

Since the I position is at a portion of the rotor 6 where rotation may occur, it is necessary to ensure that the second liquid level sensor 12 does not interfere or collide with the rotor 6. Therefore, as shown in fig. 3, a mounting bracket 14 is fixed on the slip ring (or end ring) 9 at the axial end of the stator 7, and the second liquid level sensor 12 is provided on the mounting bracket 14 at a position close to 6 o' clock of the rotor 6 and close to the nacelle 2 (i.e., the I position shown in fig. 1).

As described above, the leakage of each heat exchange unit 40 is separately monitored by differently arranging the first and second liquid level sensors 11 and 12.

Furthermore, the utility model discloses still provide and adopt to set up level sensor and temperature and humidity sensor simultaneously to cooperative control's mode makes both monitoring results of level sensor and temperature and humidity sensor verify mutually, can improve leakage monitoring's accuracy and reliability from this.

As shown in fig. 1, each heat exchange unit 40 may be provided with a temperature and humidity sensor 20, and each temperature and humidity sensor 20 may be disposed near an outlet 48 of the heat exchange cavity of each heat exchange unit 40 (i.e., position II shown in fig. 1) for monitoring the temperature and humidity of air flowing through the outlet 48 of the heat exchange cavity of each heat exchange unit 40. During the continuous operation of the blower 32, the air inside the generator is pumped out, and when the heat exchanger 30 or the pipeline 31 leaks, the liquid evaporates or vaporizes, which causes the air humidity to rise greatly instantly and the air temperature to drop rapidly. Therefore, by monitoring the change in temperature and humidity at the position II of each heat exchange unit, it can be determined therefrom whether the heat exchanger 30 or the piping 31 is leaking.

Fig. 4 shows a schematic view of a leakage monitoring system of a cooling system according to an exemplary embodiment of the present invention. The leakage monitoring system may include a plurality of liquid level sensors (i.e., a plurality of first liquid level sensors 11 and a plurality of second liquid level sensors 12), a plurality of temperature and humidity sensors 20, and a control unit 60, and the control unit 60 may be electrically connected to the plurality of liquid level sensors 11, 12 and the plurality of temperature and humidity sensors 20 and monitor signals of the plurality of liquid level sensors 11, 12 and the plurality of temperature and humidity sensors 20.

In addition, the leakage monitoring system may further include a liquid level alarm module 61 and an abnormal temperature and humidity alarm module 62, the control unit 60 may further be electrically connected to the liquid level alarm module 61 and the abnormal temperature and humidity alarm module 62, and the control unit 60 may control the alarm of the liquid level alarm module 61 according to the monitored signals of each of the liquid level sensors 11 and 12, and may control the alarm of the abnormal temperature and humidity alarm module 62 according to the monitored signals of each of the temperature and humidity sensors 20.

In addition, the control unit 60 may be electrically connected to a pump start/stop switch 63 and an electric ball valve 64 of a pump that conveys a cooling medium to the heat exchangers 8 in the plurality of heat exchange units 40, and the control unit 60 may control operations of the pump start/stop switch 63 and the electric ball valve 64 according to an alarm signal of the liquid level alarm module 61 and/or the temperature/humidity abnormality alarm module 62. Furthermore, the control unit 60 may also be electrically connected with a main control system 70 of the wind park.

When the inside of the generator (the heat exchanger 30 or the pipeline 31) leaks, the signals monitored by the temperature and humidity sensor 12 will change obviously and are transmitted to the control unit 60, and the control unit 60 controls the alarm of the temperature and humidity abnormity alarm module 62 and controls and displays the serial number and the leakage position of the heat exchange unit 40 of the wind driven generator 1. In addition, signals monitored by the liquid level sensors 11 and 12 are also changed and transmitted to the control unit 60, and the control unit 60 controls the alarm of the liquid level alarm module 61 and controls and displays the number and the leakage position of the heat exchange unit 40 of the wind driven generator 1.

The control unit 60 is configured to receive the electrical signals transmitted by the liquid level sensors 11 and 12 and the temperature and humidity sensor 20, perform amplification, modification and logic operation on the electrical signals, control the alarm of the liquid level alarm module 61, the alarm of the temperature and humidity abnormality alarm module 62, and control the operation of a pump station of the water cooling system, and may control the flow rate or start and stop of the pump by controlling the operations of the pump start-stop switch 63 and the electric ball valve 64. If necessary, the system is communicated with the main control system 70 of the wind generating set for remote control and timely shutdown maintenance.

In the operation process of the wind generating set, when the liquid level alarm module 61 and the temperature and humidity abnormity alarm module 62 alarm at the same time, the system is indicated to leak, the set can be immediately shut down for maintenance until the set is started to operate after troubleshooting. If the liquid level alarm module 61 and the temperature and humidity abnormity alarm module 62 do not alarm, it indicates that the leakage-free unit is operating normally, and if one of the liquid level alarm module 61 and the temperature and humidity abnormity alarm module 62 alarms, it indicates that a non-leakage fault exists, and selects a proper time to check on board, and confirms to eliminate.

The utility model discloses an inboard a plurality of independent heat transfer units each other of arranging along circumference symmetry or asymmetrically at aerogenerator's stator, can be through adopting above-mentioned cooling system that is used for aerogenerator, can independently cool off each circumference position of aerogenerator's stator, and then can control the cooling degree of each circumference position of stator, can realize the symmetry or the asymmetric cooling to the stator. In addition, each heat exchange unit is independent of the other to facilitate leakage monitoring, e.g., leakage in each heat exchange unit can be accurately monitored and troubleshooting or maintenance can be performed individually.

Furthermore, the utility model discloses according to aerogenerator's unique structural design and cooling principle, the heat transfer unit to different positions sets up level sensor with the mode of difference to can monitor each possible hydrops point effectively and monitor.

Furthermore, the utility model discloses a liquid level sensor reports to the police in coordination, temperature and humidity sensor reports to the police two kinds of modes monitoring and discernment leakage point, can improve wind generating set's water cooling system leakage monitoring's reliability.

Additionally, the utility model discloses a make leakage monitoring system's the control unit and wind generating set's major control system cooperate, leak the back with major control system communication monitoring cooling system, guide aerogenerator to carry out the corresponding protection action of setting for, avoid leaking destructive influence and great economic loss such as arousing that generator inner winding punctures, short circuit.

While the present invention has been particularly shown and described with reference to particular embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims (e.g., various features of the invention may be combined to obtain new embodiments). Such combinations, modifications and improvements are intended to be within the scope of the invention.

Claims (12)

1. A cooling system for a wind power generator, characterized in that the cooling system comprises a plurality of heat exchange units (40) arranged circumferentially inside a stator (7) of the wind power generator (1), which are independent of each other, each heat exchange unit (40) having a heat exchange cavity and a heat exchanger (30) arranged therein, each heat exchange cavity having an inlet (47) and an outlet (48), the inlet (47) of the heat exchange cavity being open towards a radially inside surface of the stator (7).

2. Cooling system for a wind power generator according to claim 1, characterized in that each heat exchanging unit (40) comprises a first radial side wall (41) and a second radial side wall (42) radially opposite each other defining the heat exchanging cavity, a first axial side wall (43) and a second axial side wall (44) axially opposite each other, and a first circumferential side wall (45) and a second circumferential side wall (46) circumferentially opposite each other,

wherein the first radial side wall (41) is closer to the axis of rotation of the wind turbine (1) than the second radial side wall (42), the first axial side wall (43) is closer to the nacelle (2) than the second axial side wall (44), the inlet (47) is provided on the second radial side wall (42), and the outlet (48) is provided on the first radial side wall (41) and near the hub side.

3. Cooling system for a wind power generator according to claim 2, characterized in that the rotational axis of the wind power generator (1) has an angle with the horizontal plane, which angle is larger than 0 degrees and smaller than 15 degrees,

the wind power generator (1) is divided into an upper half located above the plane and a lower half located below the plane based on a plane passing through the rotation axis and forming the angle with the horizontal plane,

the cooling system further comprises a leakage monitoring system comprising a plurality of liquid level sensors (11, 12), the plurality of liquid level sensors (11, 12) comprising a first liquid level sensor (11) for monitoring a leakage situation of the plurality of heat exchanging units (40) in the upper half of the wind turbine (1) and a second liquid level sensor (12) for monitoring a leakage situation of the plurality of heat exchanging units (40) in the lower half of the wind turbine (1).

4. Cooling system for a wind power generator according to claim 3,

the first liquid level sensor (11) is arranged in each heat exchange unit (40) of a plurality of heat exchange units (40) in the upper half part of the wind driven generator (1),

a plurality of heat exchange units (40) in the lower half part of the wind driven generator (1) share one second liquid level sensor (12).

5. Cooling system for a wind power plant according to claim 4, characterized in that the first liquid level sensor (11) is arranged inside the heat exchange unit (40) near the intersection of the first radial side wall (41) and the first axial side wall (43) of the heat exchange unit (40) to monitor liquid accumulation leaking by a heat exchanger (30) in the heat exchange unit (40) and accumulating at the intersection of the first radial side wall (41) and the first axial side wall (43),

the second level sensor (12) is arranged outside the heat exchange unit (40) and close to the 6 o 'clock of the rotor (6) of the wind turbine (1) and close to the nacelle (2) position to monitor the liquid accumulation leaked by the heat exchangers (30) in the plurality of heat exchange units (40) in the lower half of the wind turbine (1) and accumulated at the 6 o' clock of the rotor (6) and close to the nacelle (2) position.

6. Cooling system for a wind power generator according to claim 5, characterized in that said first circumferential side wall (45) is offset in a circumferential direction in a clockwise direction with respect to said second circumferential side wall (46),

for a plurality of heat exchange units (40) located between 12 o 'clock and 3 o' clock in the upper half of the wind turbine (1), the first liquid level sensor (11) is arranged close to the intersection of the first radial side wall (41), the first axial side wall (43) and the first circumferential side wall (45) of the heat exchange units (40),

for a plurality of heat exchange units (40) located between 9 and 12 o' clock in the upper half of the wind turbine (1), the first liquid level sensor (11) is arranged close to the intersection of the first radial side wall (41), the first axial side wall (43) and the second circumferential side wall (46) of the heat exchange units (40).

7. Cooling system for a wind generator according to claim 3, characterized in that said second level sensor (12) is arranged on a mounting bracket (14) on a collector ring (9) fixed to an axial end of said stator (7).

8. Cooling system for a wind power plant according to any of claims 3-7, characterized in that the leakage monitoring system further comprises a plurality of temperature and humidity sensors (20) and a control unit (60), the control unit (60) being electrically connected with the plurality of liquid level sensors (11, 12) and the plurality of temperature and humidity sensors (20) and monitoring signals of the plurality of liquid level sensors (11, 12) and the plurality of temperature and humidity sensors (20).

9. Cooling system for a wind power plant according to claim 8, characterized in that each heat exchanging unit (40) is provided with a temperature and humidity sensor (20) and that each temperature and humidity sensor (20) is arranged close to the outlet (48) of the heat exchanging cavity of each heat exchanging unit (40) for monitoring the temperature and humidity of the air flowing through the outlet (48) of the heat exchanging cavity of each heat exchanging unit (40).

10. The cooling system for a wind turbine according to claim 8, wherein the leakage monitoring system further comprises a liquid level alarm module (61) and a temperature and humidity abnormality alarm module (62), the control unit (60) is further electrically connected to the liquid level alarm module (61) and the temperature and humidity abnormality alarm module (62), and the control unit (60) controls the alarm of the liquid level alarm module (61) according to the monitored signal of each liquid level sensor (11, 12) of the plurality of liquid level sensors (11, 12) and controls the alarm of the temperature and humidity abnormality alarm module (62) according to the monitored signal of each temperature and humidity sensor (20) of the plurality of temperature and humidity sensors (20).

11. The cooling system for a wind turbine according to claim 10, wherein the control unit (60) is further electrically connected to a pump start/stop switch (63) and an electric ball valve (64) of a pump that delivers a cooling medium to the heat exchanger (30) of the plurality of heat exchanging units (40), and the control unit (60) further controls the operation of the pump start/stop switch (63) and the electric ball valve (64) according to an alarm signal of the liquid level alarm module (61) and/or the temperature/humidity abnormality alarm module (62).

12. A wind park according to any of claims 1-11, comprising a cooling system.

Images