CN110676980A - Cooling device, stator and wind driven generator - Google Patents

Abstract

The invention discloses a cooling device, a stator and a wind generator. The cooling device includes an air cooling system and a liquid cooling pipeline; the air cooling system includes a gaseous medium flow path for allowing the gaseous medium to circulate inside the wind turbine and a first heat exchange device arranged on the gaseous medium flow path; the liquid cooling pipeline includes a The first part inside the first heat exchange device and the second part located on the inside or the outer surface of the stator; wherein the cooling liquid in the liquid cooling pipeline flows through the first part and the second part successively. The invention utilizes the combination of the air cooling system and the liquid cooling pipeline, which not only improves the cooling efficiency of the wind turbine, but also reduces the internal temperature rise and temperature gradient of the wind turbine, and also makes the cooling device have high reliability, easy maintenance and high reliability. The advantage of low cost.

Description

Cooling devices, stators and wind turbines

technical field

The invention relates to the field of wind power generation, in particular to a cooling device, a stator and a wind generator.

Background technique

The copper consumption and iron consumption generated during the operation of the wind turbine will cause the temperature rise of various components of the wind turbine. Excessive temperature rise will directly affect the life of the wind turbine and even cause it to fail to operate normally. Among the various components of the motor, the winding insulation is most affected by the temperature rise. Every 10°C increase in the winding insulation temperature will reduce the life of the winding insulation by about half. When the wind turbine is running, due to the failure of the cooling system, the insulation temperature will be far Exceeding the limit range, more serious, may also cause complete breakdown of the insulation and damage to the motor. For permanent magnet wind turbines, the temperature of the permanent magnets also needs to be controlled to a certain limit to prevent the permanent degradation of motor performance caused by irreversible demagnetization. Therefore, cooling design is a very important part of wind turbine design and a necessary condition to ensure the reliability of wind turbines.

Among the existing wind turbine cooling technologies, air cooling technology is relatively mature, and has the advantages of high reliability, easy maintenance, and low cost. Therefore, for occasions with high reliability requirements and difficult maintenance, such as offshore wind turbines, Air cooling has obvious advantages over other cooling technologies. However, the biggest disadvantage of air cooling is the low cooling efficiency, which is particularly obvious in recent years when the volume of wind turbines increases and the torque density increases. The existing 6-8MW wind turbines can still meet the cooling requirements with air cooling technology. The effect is very limited. Especially for offshore units, the anti-corrosion requirements determine that the engine room must be implemented as a closed type. Therefore, the air cooling can only rely on the heat exchange device to transfer the heat of the circulating air inside the wind turbine to the outside world, so the temperature of the cooling air inside the motor must be higher than the outside world, which further reduces the air cooling efficiency.

Another feasible method is liquid cooling technology, such as using water jacket cooling, that is, arranging the liquid cooling device outside the stator core, and also arranging the liquid cooling device inside the stator core but not directly engaging with the stator windings The cooling structure has been applied in some models. Compared with internal water cooling, since water jacket cooling is not directly connected to the windings, it is possible to completely avoid installing insulating devices and cooling liquid conductivity control devices on the cooling liquid circuit through reasonable design, thereby greatly enhancing its feasibility and reliability. , economy. Although the water jacket cooling technology has played a good role in the application of wind turbines in the past, the cooling effect for the future large-megawatt wind turbines is also limited. This is because when the liquid cooling device is arranged on one side outside the winding, most of the heat generated inside the winding coil will reach the liquid cooling device through this side, and this path needs to pass through the multi-layers with a thermal conductivity of 0.2W/mK. Insulation, resulting in a large temperature gradient on the heat transfer path, which also means that the local temperature inside the winding coil is high.

To sum up, the cooling efficiency of the existing air-cooled and liquid-cooled technologies for wind turbines is relatively low, and cannot well adapt to the trend of large-scale offshore wind turbines in the future, resulting in high cost of offshore units.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a cooling device, a stator and a wind generator in order to overcome the above-mentioned defects of relatively low cooling efficiency of the air cooling technology and liquid cooling technology in the prior art wind turbine.

The present invention solves the above-mentioned technical problems through the following technical solutions:

A cooling device for a wind generator, the wind generator comprising a stator, a rotor, an air gap between the stator and the rotor, and a cooling device for cooling the wind generator, characterized in that: The cooling device includes an air-cooling system and a liquid-cooling pipeline; the air-cooling system includes a gaseous medium flow path for allowing the gaseous medium to circulate inside the wind turbine and a first heat exchange provided on the gaseous medium flow path device; the liquid cooling pipeline includes a first part located inside the first heat exchange device and a second part located inside or on the outer surface of the stator; wherein the cooling liquid in the liquid cooling pipeline flows through the the first part, the second part. In this embodiment, by adopting the above structure, the air cooling system is used to transfer the heat generated by the wind turbine to the first heat exchange device, and the first heat exchange device is used to transfer the heat to the outside; The second part transfers the heat of the stator to the first heat exchange device, and at the same time, the first part of the liquid cooling pipeline first flows through the first heat exchange device, which is beneficial to reduce the temperature of the first heat exchange device, thereby improving the cooling device. heat transfer efficiency. This embodiment uses the combination of the air cooling system and the liquid cooling pipeline, which not only improves the cooling efficiency of the wind turbine, but also reduces the internal temperature rise and temperature gradient of the wind turbine, and makes the cooling device more reliable and easy to maintain. and low cost.

Preferably, the first heat exchange device is an air-water heat exchanger having a gas side and a liquid side, the air cooling system is communicated with the gas side, the liquid cooling pipeline is communicated with the liquid side, and The liquid side includes a second portion of the liquid cooling line.

In this embodiment, by adopting the above structure and using an air-water heat exchanger having a gas side and a liquid side, the first heat exchange device can absorb the heat of the air cooling system in time, which is beneficial to effectively reduce the temperature of the gaseous medium. The liquid cooling pipeline is connected to the liquid side, so that the liquid cooling pipeline can effectively exchange heat with the first heat exchange device, which is beneficial to effectively reduce the temperature of the first heat exchange device. The thermal device is also beneficial to more efficiently lowering the temperature of the gas medium in the air cooling system, thereby helping to improve the cooling efficiency of the air cooling system, and finally, helping to improve the cooling efficiency of the cooling device.

Preferably, the air-water heat exchanger is located at the radial inner side of the stator, and the air gap is located at the radial outer side of the stator, wherein the radial outer side is opposite to the radial inner side.

Preferably, the air cooling system further comprises a fan for driving the gaseous medium to flow inside the wind turbine, and the fan is arranged on the flow path of the gaseous medium.

In this embodiment, by adopting the above structure, the fan is used to drive the flow of the gaseous medium, which is beneficial to reduce the cost of the cooling device and improve the life of the cooling device.

Preferably, the air cooling system is a closed system, and the gaseous medium circulates inside the wind turbine.

In this embodiment, by adopting the above structure, by designing the air cooling system as a closed system, it is beneficial to reduce the influence of external gas on the interior of the wind turbine, especially for offshore wind turbines, the closed system can effectively Avoid the corrosion of the inside of the wind turbine by the sea breeze.

Preferably, the fan is provided inside the first heat exchange device or on the first heat exchange device.

Preferably, the fan is further provided with a switch device and/or a frequency conversion device for adjusting the switch of the fan and/or the flow rate of the gaseous medium passing through the fan.

In this embodiment, by adopting the above structure, and by arranging a switch device and/or a frequency conversion device on the fan, it is beneficial to flexibly control the working state of the fan.

Preferably, the flow path of the gaseous medium includes: an end space located on at least one side of the stator axial direction, the air gap located on the radial outer side of the stator, and a radial ventilation slot located inside the stator. , the inner cavity located on the inner side of the stator radial direction, the first heat exchange device located on the inner side of the stator radial direction and located in the inner cavity, the gaseous medium successively flows through the end space, the air gap, the radial ventilation slot, the inner cavity, the first heat exchange device.

In this embodiment, by adopting the above structure, the space inside the wind turbine is used as the flow path of the gaseous medium, which simplifies the design form of the flow path, which is beneficial for the gaseous medium to directly transfer the heat in the wind turbine to the first heat exchanger. heat device, thereby improving the heat exchange efficiency of the cooling device.

Preferably, the yoke of the stator is provided with a through hole extending in the axial direction, and the second part of the liquid cooling pipeline is at least partially provided in the through hole.

In this embodiment, by adopting the above structure, by disposing the second part of the liquid cooling pipeline in the through hole of the stator, the direct contact of the cooling liquid with the stator is avoided, and the corrosion of the stator by the cooling liquid is also avoided. At the same time, the requirements for the cooling liquid are also reduced, so that the cooling liquid does not need special deionization treatment. It is also beneficial to reduce the use cost of the cooling device, to improve the efficiency of heat transfer between the liquid cooling pipeline and the stator, and thus to rapidly reduce the temperature of the stator.

Preferably, the second part of the liquid cooling pipeline includes a plurality of U-shaped tubes, the U-shaped tubes are inserted and installed into the through holes, and the U-shaped tubes are communicated with each other through a connecting device.

In this embodiment, by adopting the above structure, the U-shaped tube is used to simplify the installation process of the second part of the liquid cooling pipeline, which is beneficial to reduce the manufacturing cost of the cooling device.

Preferably, the connecting device is at least one of a clamp, a welded joint, a water diversion box and a threaded joint.

In this embodiment, by adopting the above structure and using clamps, welded joints, water diversion boxes and threaded joints as connection devices, the firmness of the connection between U-shaped pipes is improved.

Preferably, the liquid cooling pipeline is communicated with an external pipeline through a main pipeline, the main pipeline is connected with one or more liquid inlets of the first part and the external pipeline, and the main pipeline is connected with the external pipeline. The one or more liquid outlets of the second part and the external piping.

In this embodiment, by adopting the above structure, the main pipeline is used to realize the communication between the liquid cooling pipeline and the external pipeline, which is beneficial to improve the flexibility of arranging the liquid cooling pipeline.

Preferably, a pump is also provided on the cooling liquid flow path of the external pipeline for driving the cooling liquid to flow, and a second heat exchange device is also provided on the cooling liquid flow path of the external pipeline for transferring the cooling liquid to the cooling liquid. The heat in the coolant is dissipated to the outside.

In this embodiment, by adopting the above structure, the flow of the cooling liquid in the liquid cooling pipeline is realized by the pump, which is also beneficial to reduce the cost of the cooling device and improve the life of the cooling device. The use of the second heat exchange device to transfer heat to the outside or other media is beneficial to further reduce the temperature of the cooling liquid in the liquid cooling pipeline, thereby improving the cooling efficiency of the cooling device. Preferably, the second heat exchange device is arranged outside the wind turbine; more preferably, the second heat exchange device is arranged outside the wind turbine.

Preferably, the liquid cooling pipeline further includes a branch pipe, and the branch pipe communicates with one or more liquid outlets of the first part and one or more liquid inlets of the second part.

Preferably, the liquid cooling pipeline is further provided with a bypass pipe and a flow regulating valve for adjusting the flow of the cooling liquid flowing through the second part.

In this embodiment, by adopting the above structure and utilizing the bypass pipe and the flow regulating valve, it is beneficial to improve the flexibility of controlling the flow direction of the cooling liquid in the liquid cooling pipeline.

A wind power generator is characterized in that the wind power generator comprises the above-mentioned cooling device of the wind power generator.

In this embodiment, by adopting the above structure and using a wind turbine with a cooling device, it is beneficial to maintain a relatively suitable temperature of the wind turbine, improve the stability of the wind turbine, and improve the power generation efficiency of the wind turbine. .

A stator, characterized in that the stator includes the above-mentioned cooling device for a wind turbine, the stator is a modular stator and includes a plurality of stator modules distributed along the circumferential direction, each of the stator modules corresponds to at least A second portion of the first heat exchange device and at least one of the liquid cooling lines.

In this embodiment, by adopting the above structure and using the cooling device, the heat generated by the stator module is efficiently transferred, which is beneficial to reduce the temperature of the stator module and improve the stability of the wind turbine.

Preferably, at least one of the stator modules includes a plurality of second parts of the liquid cooling pipelines formed in parallel.

Preferably, all the stator modules have the same size, and all the stator modules correspond to the same number of the first heat exchange devices and the same number of the second parts of the liquid cooling pipeline.

In this embodiment, by adopting the above structure, it is beneficial to improve the standardization level of the stator module, to shorten the production cycle of the wind turbine, and to reduce the production cost of the wind turbine.

A wind power generator is characterized in that the wind power generator comprises the stator as described above.

In this embodiment, by adopting the above structure and using the stator including the cooling device, it is helpful for the wind turbine to maintain a relatively suitable temperature, which is beneficial to improve the stability of the wind turbine and the power generation efficiency of the wind turbine.

On the basis of conforming to common knowledge in the art, the above preferred conditions can be combined arbitrarily to obtain preferred examples of the present invention.

The positive progressive effect of the present invention is:

The cooling device of the present invention uses the air cooling system to transfer the heat generated by the wind turbine to the first heat exchange device, and uses the first heat exchange device to transfer the heat to the outside; and then uses the second part of the liquid cooling pipeline to transfer the heat of the stator. It is transferred to the first heat exchange device, and at the same time, the first part of the liquid cooling pipeline first flows through the first heat exchange device, which is beneficial to reduce the temperature of the first heat exchange device, and further helps to improve the heat exchange efficiency of the cooling device. The invention utilizes the combination of the air cooling system and the liquid cooling pipeline, which not only improves the cooling efficiency of the wind turbine, but also reduces the internal temperature rise and temperature gradient of the wind turbine, and further enables the cooling device to have high reliability, easy maintenance and high reliability. The advantage of low cost.

Description of drawings

FIG. 1 is a schematic diagram of the principle of the cooling device according to Embodiment 1 of the present invention.

FIG. 2 is a schematic structural diagram of a cooling device according to Embodiment 1 of the present invention.

FIG. 3 is a schematic diagram of the connection of U-shaped tubes of the stator module in the cooling device according to Embodiment 1 of the present invention.

FIG. 4 is another schematic structural diagram of the cooling device according to Embodiment 1 of the present invention.

Description of reference numbers:

Cooler 100

The first heat exchange device 11

Import 111

Exit 112

Axial Fan 12

Air Gap 13

Radial ventilation slots 14

Internal cavity of stator 15

end space 16

Main Road 21

U-tube 22

Clamp 23

Branch line 24

Rotor 30

Stator Module 40

Fixtures 41

Gaseous medium flows to AF

Coolant flows to CF

Detailed ways

The present invention will be more clearly and completely described below by means of the embodiments and in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the embodiments.

Example 1

As shown in FIGS. 1-4 , the present embodiment is a cooling device 100 for a wind turbine. The wind turbine includes a stator, a rotor 30 , an air gap 13 between the stator and the rotor 30 , and a cooling device for cooling the wind turbine. The cooling device 100 includes an air cooling system and a liquid cooling pipeline; the air cooling system includes a gaseous medium flow path for circulating the gaseous medium inside the wind turbine and a first heat exchange device 11 arranged on the gaseous medium flow path ; The liquid cooling pipeline includes a first part located inside the first heat exchange device 11 and a second part located inside or on the outer surface of the stator; wherein the cooling liquid in the liquid cooling pipeline flows through the first part and the second part successively. In this embodiment, by adopting the above structure, the air cooling system is used to transfer the heat generated by the wind turbine to the first heat exchange device 11, and the first heat exchange device 11 is used to transfer the heat to the outside; The second part of the liquid cooling pipeline transfers the heat of the stator to the first heat exchange device 11, and at the same time, the first part of the liquid cooling pipeline first flows through the first heat exchange device 11, which is beneficial to reduce the temperature of the first heat exchange device 11, thereby reducing the temperature of the first heat exchange device 11. It is beneficial to improve the heat exchange efficiency of the cooling device 100 . This embodiment utilizes the combination of an air cooling system and a liquid cooling pipeline, which not only improves the cooling efficiency of the wind turbine, but also reduces the internal temperature rise and temperature gradient of the wind turbine, and makes the cooling device 100 highly reliable and easy to use. The advantages of maintenance and low cost. Description: The first part of the liquid cooling pipeline is located inside the first heat exchange device 11, which is not shown in Figures 1-4, and the second part of the liquid-cooling pipeline includes the pipeline shown in Figures 1-4.

As an embodiment, the first heat exchange device 11 can also be designed as an air-water heat exchanger having a gas side and a liquid side, the air cooling system is communicated with the gas side, the liquid cooling pipeline is communicated with the liquid side, and the liquid side includes The second part of the liquid cooling line. In this embodiment, an air-water heat exchanger having a gas side and a liquid side is used, so that the first heat exchange device 11 can absorb the heat of the air cooling system in time, which is beneficial to effectively reduce the temperature of the gaseous medium. The liquid cooling pipeline is connected to the liquid side, so that the liquid cooling pipeline can effectively exchange heat with the first heat exchange device 11, which is beneficial to effectively reduce the temperature of the first heat exchange device 11. A heat exchange device 11 is also beneficial to reduce the temperature of the gas medium in the air cooling system more efficiently, thereby improving the cooling efficiency of the air cooling system, and finally, improving the cooling efficiency of the cooling device 100 .

As a preferred embodiment, the air-water heat exchanger may also be located on the radial inner side of the stator, and the air gap 13 is located on the radial outer side of the stator, wherein the radial outer side is opposite to the radial inner side.

In order to improve the flow speed of the gaseous medium, the air cooling system further includes a fan for driving the gaseous medium to flow inside the wind turbine, and the fan is arranged on the flow path of the gaseous medium. In this embodiment, a fan is used to drive the flow of the gaseous medium, which is beneficial to reduce the cost of the cooling device 100 and improve the lifespan of the cooling device 100 .

As a preferred embodiment, the air cooling system can also be a closed system, and the gaseous medium circulates inside the wind turbine. In this embodiment, by designing the air cooling system as a closed system, it is beneficial to reduce the influence of external gas on the interior of the wind turbine, especially for offshore wind turbines, the use of a closed system can effectively prevent the sea breeze from affecting the interior of the wind turbine. corrosion.

As a preferred embodiment, the fan may also be provided inside the first heat exchange device 11 or on the first heat exchange device 11 .

In other embodiments, the fan may also be provided with a switch device and/or a frequency conversion device for adjusting the switch of the fan and/or the flow of gaseous medium passing through the fan. In this embodiment, by arranging a switch device and/or a frequency conversion device on the fan, it is beneficial to flexibly control the working state of the fan.

As an embodiment, specifically, as shown in FIG. 1 , the flow path of the gaseous medium includes: an end space 16 located on at least one side of the stator axial direction, an air gap 13 located radially outside of the stator, and a diameter located inside the stator. To the ventilation groove 14, the inner cavity located on the inner side of the stator radial direction, the first heat exchange device 11 located on the inner side of the stator radial direction and located in the inner cavity, the gaseous medium flows through the end space 16, the air gap 13, Radial ventilation groove 14 , internal cavity, first heat exchange device 11 . The gaseous medium circulates in the flow path, forming the gaseous medium flowing to the AF. In this embodiment, the space inside the wind turbine is used as the flow path of the gaseous medium, which simplifies the design form of the flow path, which is beneficial for the gaseous medium to directly transfer the heat in the wind turbine to the first heat exchange device 11, thereby improving the cooling device. 100 heat transfer efficiency.

In other embodiments, the yoke of the stator may further be provided with a through hole extending in the axial direction, and the second part of the liquid cooling pipeline is at least partially provided in the through hole. In this embodiment, by arranging the second part of the liquid cooling pipeline in the through hole of the stator, the direct contact of the cooling liquid with the stator is avoided, and the corrosion of the stator by the cooling liquid is also avoided. At the same time, the requirements for the cooling liquid are also reduced, so that the cooling liquid does not need special deionization treatment. It is also beneficial to reduce the use cost of the cooling device 100 and to improve the efficiency of heat transfer between the liquid cooling pipeline and the stator, which is further beneficial to rapidly reduce the temperature of the stator.

As a preferred embodiment, the second part of the liquid cooling pipeline may further include a plurality of U-shaped tubes 22, the U-shaped tubes 22 are inserted and installed into the through holes, and the U-shaped tubes 22 are connected through a connecting device. In this embodiment, the U-shaped pipe 22 is used to simplify the installation process of the second part of the liquid cooling pipeline, which is beneficial to reduce the manufacturing cost of the cooling device 100 . Compared to using straight pipes, this embodiment reduces the use of connecting means by about half.

In order to improve the firmness of the connection of the U-shaped pipe 22, the connection device can also be at least one of a clamp 23, a welded joint, a water diversion box and a threaded joint. In this embodiment, the clamp 23 , the welded joint, the water diversion box and the threaded joint are used as connection devices, which improves the firmness of the connection between the U-shaped pipes 22 .

As an embodiment, the liquid cooling pipeline can also be communicated with the external pipeline through the main pipeline 21, the main pipeline 21 is connected with one or more liquid inlets of the first part and the external pipeline, and the main pipeline 21 is connected with one of the second part or multiple outlets and external piping. In this embodiment, the main pipeline 21 is used to realize the communication between the liquid cooling pipeline and the external pipeline, which is beneficial to improve the flexibility of arranging the liquid cooling pipeline.

In order to improve the fluidity of the cooling liquid, a pump may also be provided on the cooling liquid flow path of the external pipeline to drive the flow of the cooling liquid, and a second heat exchange device may also be provided on the cooling liquid flow path of the external pipeline for Dissipate the heat in the coolant to the outside or other medium. In this embodiment, the pump is used to realize the flow of the cooling liquid in the liquid cooling pipeline, which is also beneficial to reduce the cost of the cooling device 100 and improve the life of the cooling device 100 . In this embodiment, the second heat exchange device is used to transfer heat to the outside world or other media, which is beneficial to further reduce the temperature of the cooling liquid in the liquid cooling pipeline, and further helps to improve the cooling efficiency of the cooling device 100 . Preferably, the second heat exchange device is arranged outside the wind turbine; more preferably, the second heat exchange device is arranged outside the wind turbine.

As shown in FIG. 1 , as an embodiment, the liquid cooling pipeline may further include a main pipeline 21 , and the main pipeline 21 sequentially passes through the outlet 112 of the first heat exchange device, the stator module 40 and the inlet of the first heat exchange device 111. As shown in FIG. 1 , the cooling liquid flows in the main pipe 21, and the cooling liquid flows to CF.

As an embodiment, the liquid cooling pipeline further includes a branch pipe, and the branch pipe communicates with one or more liquid outlets of the first part and one or more liquid inlets of the second part.

As a preferred embodiment, the liquid cooling pipeline is further provided with a bypass pipe and a flow regulating valve, which are used to adjust the flow rate of the cooling liquid flowing through the second part. This embodiment utilizes the bypass pipe and the flow regulating valve, which is beneficial to improve the flexibility of controlling the flow direction of the cooling liquid in the liquid cooling pipeline.

As a preferred embodiment, the liquid cooling circuit may further include a branch pipe 24, one end of the branch pipe 24 is communicated with the inlet of the U-shaped pipe 22, and the other end of the branch pipe 24 is communicated with the outlet of the U-shaped pipe 22. The passage 24 is used to adjust the flow rate of the cooling liquid in the U-shaped pipe 22 . As shown in FIG. 4 , the first heat exchange device 11 and the stator module 40 are fixed on the fixing device 41 . The branch line 24 is provided between the inlet 111 and the outlet 112 . In this embodiment, the branch pipe 24 is used to realize the adjustment of the cooling liquid flow rate in the U-shaped pipe 22 , and the flow rate of the cooling liquid in the U-shaped pipe 22 can be adjusted correspondingly according to the actual temperature of the stator module 40 , thereby preventing the stator module 40 from being damaged. If the temperature is too high or too low, the stability of the wind turbine is improved. In other embodiments, each stator module 40 may also be provided with at least one branch line 24 . Of course, as an optional implementation manner, each stator module 40 may also be provided with at least one set of cooling devices 100 . This embodiment is beneficial to improve the cooling efficiency of the cooling device 100 . As a preferred embodiment, the inlet position of the branch pipe 24 is set at the circumferential middle of the stator module 40, and the outlet of the branch pipe 24 is set at the circumferential end of the stator module 40, so that the temperature at the circumferential end may be slightly higher than the middle, This facilitates the sufficient joining of two adjacent stator modules 40 after expansion. Of course, the inlet position of the branch pipe 24 can also be set at the circumferential end of the stator module 40 . In addition, by arranging the branch pipes 24, the overall cooling effect of the wind turbine can be adjusted, which is beneficial to avoid deformation and fatigue damage of the structural parts of the wind turbine due to excessive shrinkage under low temperature conditions.

As a preferred embodiment, the cooling liquid may also include ethylene glycol solution. In this embodiment, the ethylene glycol solution is used as the cooling liquid, which is beneficial to improve the antifreeze performance of the cooling device, improve the cooling efficiency of the cooling device 100 , and reduce the use cost of the cooling device 100 . In other embodiments, water can also be used as the cooling liquid, which can also ensure the cooling efficiency of the cooling device 100 .

In other embodiments, the cooling liquid may further include an additive liquid, which is used for anticorrosion or for adjusting the pH value of the cooling liquid to neutral or weakly alkaline.

The air flow of the air cooling system in this embodiment can also be adjusted by a fan, and the cooling liquid flow of the liquid cooling pipeline can pass through the branch pipeline 24, so that the overall cooling effect of the wind turbine can be adjusted. Therefore, under low temperature conditions, this embodiment can effectively reduce the deformation and fatigue damage of the structural parts of the wind turbine due to excessive shrinkage. In addition, this embodiment can also control the air-cooling system and the liquid-cooling pipeline separately, so as to reduce the operating power of the fan and the number of fans as much as possible on the premise that the temperature of each component of the wind turbine is controlled within the allowable range , thereby reducing energy consumption.

As a preferred embodiment, the second heat exchange device of the cooling device 100 can also be arranged outside the nacelle of the wind turbine, the second heat exchange device is communicated with the liquid cooling pipeline, and the second heat exchange device is arranged in the liquid cooling pipeline. Between the heat source in the cold pipeline and the first heat exchange device 11 . In this embodiment, the second heat exchange device is used to further reduce the temperature of the cooling liquid in the liquid cooling circuit; at the same time, the second heat exchange device is arranged between the heat source and the first heat exchange device 11, so that the second heat exchange device is The cooling liquid cooled by the device first enters the first heat exchange device 11, which is beneficial to reduce the temperature of the first heat exchange device 11, so that the first heat exchange device 11 can reduce the temperature of the gaseous medium in the air cooling system more efficiently. The temperature of the gaseous medium located upstream of the first heat exchange device is often lower than the temperature of the stator module 40 , and the cooling liquid first cools the cooler air and then cools the hotter stator module 40 , which has better heat dissipation capacity. This embodiment is beneficial to improve the cooling efficiency of the air-cooling system, and is further beneficial to improve the cooling efficiency of the cooling device 100 . As an embodiment, the second heat exchange device can also be selected as an air-water heat exchanger.

In this embodiment, the air cooling system and the liquid cooling pipeline are connected in series. On the premise of ensuring the compatibility of the two, the entire cooling device 100 is made more concise and compact, and the space occupation of related equipment is also reduced. This embodiment avoids the problem of increased cooling liquid flow caused by the need for cooling of the air cooling system and the liquid cooling pipeline respectively. After passing through the second heat exchange device, the cooling liquid in this embodiment first passes through the first heat exchange device 11 and then enters the main pipe 21 , which is beneficial to enhance the cooling efficiency of the cooling device 100 . The reasons are as follows: although the cooling efficiency of the liquid cooling pipeline is high, the liquid cooling pipeline is only located on one side of the winding of the stator module 40 , so that the effective heat dissipation path of the liquid cooling pipeline is less than that of the air cooling system. Therefore, in the yoke portion of the stator module 40 , the overall cooling effect of the arrangement of the liquid cooling pipes is not as good as that of the air cooling system using the radial ventilation slots 14 . That is to say, in the case of using the air cooling system and the liquid cooling pipeline at the same time, the inlet air temperature of the air cooling system and the liquid inlet temperature of the liquid cooling pipeline are reduced by the same degree, and the cooling effect of the former on the wind turbine is increased more obviously.

Example 2

This embodiment is a kind of stator. For convenience of description, this embodiment continues to refer to the reference numerals in Embodiment 1. FIG. The stator of this embodiment includes the above-mentioned cooling device 100 for a wind turbine. The stator is a modular stator and includes a plurality of stator modules 40 distributed along the circumferential direction. Each stator module 40 corresponds to at least one first heat exchange device 11 and at least one The second section of a liquid cooling line. In this embodiment, the cooling device 100 is used, so that the heat generated by the stator module 40 is efficiently transferred, which is beneficial to reduce the temperature of the stator module 40 and improve the stability of the wind turbine.

As an embodiment, at least one stator module 40 includes a plurality of second parts of liquid cooling pipelines formed in parallel. In other embodiments, all the stator modules 40 have the same size, and all the stator modules 40 correspond to the same number of first heat exchange devices 11 and the same number of second parts of the liquid cooling pipeline. This embodiment is beneficial to improve the standardization level of the stator module 40, to shorten the production cycle of the wind power generator, and to reduce the production cost of the wind power generator.

Example 3

This embodiment is a wind power generator, which includes the cooling device 100 in the first embodiment or the stator in the second embodiment. For convenience of description, this embodiment continues to refer to the reference numerals in Embodiment 1.

The wind turbine in this embodiment may include the cooling device 100 in Embodiment 1. Using the wind turbine including the cooling device 100 is helpful for the wind turbine to maintain a relatively suitable temperature and for improving the stability of the wind turbine. It is beneficial to improve the power generation efficiency of wind turbines.

The wind power generator in this embodiment may include the stator in Embodiment 2. Using the stator including the cooling device 100 is helpful for the wind power generator to maintain a relatively suitable temperature, for improving the stability of the wind power generator, and for improving wind power generation. power generation efficiency of the machine.

Although the specific embodiments of the present invention are described above, those skilled in the art should understand that this is only an illustration, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims (20)

1. A cooling device for a wind turbine, the wind turbine comprising a stator, a rotor, an air gap between the stator and the rotor, and a cooling device for cooling the wind turbine, wherein In that, the cooling device includes an air cooling system and a liquid cooling pipeline; The air cooling system includes a gaseous medium flow path for allowing the gaseous medium to circulate inside the wind turbine, and a first heat exchange device provided on the gaseous medium flow path; The liquid cooling pipeline includes a first part located inside the first heat exchange device and a second part located inside or on the outer surface of the stator; wherein the cooling liquid in the liquid cooling pipeline flows through the The first part, the second part. 2 . The cooling device for a wind power generator according to claim 1 , wherein the first heat exchange device is an air-water heat exchanger having a gas side and a liquid side, and the air cooling system is connected to the gas side. 3 . The liquid cooling line communicates with the liquid side, and the liquid side includes a second portion of the liquid cooling line. 3 . The cooling device for a wind turbine according to claim 2 , wherein the air-water heat exchanger is located radially inside the stator, and the air gap is located radially outside the stator, wherein The radially outer side is opposite to the radially inner side. 4 . The cooling device for a wind turbine according to claim 1 , wherein the air cooling system further comprises a fan for driving the gaseous medium to flow inside the wind turbine, and the fan is located in the wind turbine. 5 . on the flow path of the gaseous medium. 5 . The cooling device for a wind turbine according to claim 4 , wherein the air cooling system is a closed system, and the gaseous medium circulates inside the wind turbine. 6 . 6 . The cooling device for a wind power generator according to claim 5 , wherein the fan is provided inside the first heat exchange device or on the first heat exchange device. 7 . 7. The cooling device for wind turbines according to claim 4, wherein a switch device and/or a frequency conversion device are further provided on the fan for adjusting the switch of the fan and/or passing the fan gaseous medium flow. 8. The cooling device for wind turbines according to any one of claims 1, 4-7, wherein the flow path of the gaseous medium comprises: an end space located on at least one side in the axial direction of the stator, the air gap located radially outside the stator, radial ventilation slots located inside the stator, the inner cavity located on the radially inner side of the stator, a first heat exchange device located radially inward of the stator and located in the inner cavity, The gaseous medium flows through the end space, the air gap, the radial ventilation slot, the inner cavity, and the first heat exchange device successively. 9 . The cooling device of the wind turbine according to claim 1 , wherein the yoke of the stator is provided with a through hole extending in the axial direction, and the second part of the liquid cooling pipeline is at least partially provided with the cooling device. 10 . in the through hole. 10 . The cooling device for wind turbines according to claim 9 , wherein the second part of the liquid cooling pipeline comprises a plurality of U-shaped tubes, and the U-shaped tubes are inserted and installed into the through holes. 11 . , the U-shaped pipes are communicated with each other through a connecting device. 11 . The cooling device for a wind turbine according to claim 10 , wherein the connecting device is at least one of a clamp, a welded joint, a water diversion box and a threaded joint. 12 . 12. The cooling device for wind turbines according to any one of claims 1, 9-11, wherein the liquid cooling pipeline communicates with an external pipeline through a main pipeline, and the main pipeline communicates with the The one or more liquid inlets of the first part and the external pipeline, and the main pipeline communicates with the one or more liquid outlets of the second part and the external pipeline. 13. The cooling device for wind turbines according to claim 12, wherein a pump is further provided on the cooling liquid flow path of the external pipeline for driving the cooling liquid to flow, and the cooling liquid of the external pipeline is further provided with a pump. A second heat exchange device is also provided on the liquid flow path for dissipating the heat in the cooling liquid to the outside. 14. The cooling device for wind turbines according to any one of claims 1, 9-11, wherein the liquid cooling pipeline further comprises a branch pipe, and the branch pipe communicates with the first part one or more liquid outlets and one or more liquid inlets of the second part. 15. The cooling device for wind turbines according to claim 14, wherein a bypass pipe and a flow regulating valve are further provided on the liquid cooling pipeline for adjusting the cooling liquid flowing through the second part flow. 16. A wind power generator, characterized in that the wind power generator comprises the cooling device of the wind power generator according to any one of claims 1-15. 17. A stator, characterized in that the stator comprises the cooling device of a wind turbine according to any one of claims 1-15, the stator is a modular stator and comprises a plurality of circumferentially distributed Stator modules, each of which corresponds to at least one of the first heat exchange devices and at least one second part of the liquid cooling pipeline. 18. The stator of claim 17, wherein at least one of the stator modules includes a plurality of second portions of the liquid cooling circuits formed in parallel. 19. The stator of claim 18, wherein all the stator modules have the same size, and all the stator modules correspond to the same number of the first heat exchange devices and the same number of the liquid cooling pipes the second part. 20. A wind generator, characterized in that the wind generator comprises the stator of claim 19.

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