Wind turbines

Abstract

The present invention provides a wind turbine generator set. The wind turbine generator set includes a heat dissipation system arranged in a nacelle. The heat dissipation system includes: an air inlet, arranged on the side wall of the nacelle, for introducing outside air into the interior of the nacelle; an air outlet, arranged on the bottom wall of the nacelle; a first exhaust duct, one end of which is connected to the interior of the generator; a cooling fan, the inlet of the cooling fan is connected to the other end of the first exhaust duct; a second exhaust duct, one end of which is connected to the outlet of the cooling fan, and the other end of the second exhaust duct is connected to the air outlet. According to the wind turbine generator set of the present invention, the heat can be effectively dissipated, the length of the nacelle cover can be shortened, the weight of the nacelle can be reduced, the load and cost of the unit can be controlled, and the reliability of the unit can be ensured by adopting the side air inlet and bottom air outlet.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and more specifically, to a wind power generator set. Background Art

[0002] As the power of wind turbines increases, the heat generated by the generators increases accordingly. Therefore, the heat dissipation system of the generators needs to effectively dissipate heat to ensure the operating efficiency of the generators and the service life of each component. The air outlet pipes used in the prior art generator heat dissipation systems are generally relatively long, which affects the heat dissipation effect of the generators.

[0003] In addition, in order to improve the heat dissipation effect, a cooling fan with a higher air volume needs to be selected, but such a cooling fan will generate more noise. At present, there are international requirements for noise control of units, and domestic units also need to control noise according to the use environment when in use. With the use of cooling fans with higher air volumes, the noise of the cooling fan is also increasing, and it accounts for an increasing proportion of the overall noise of the unit. The noise of the cooling fan is mainly the aerodynamic noise of the fan impeller, which is directly related to the power and speed of the cooling fan.

[0004] At present, for the noise of cooling fans, cooling fan impellers made of special materials can be used, which can reduce the noise of cooling fans to a certain extent, but the reduction is limited. In the prior art, an air outlet is set at the tail of the nacelle, and a silencer is installed at the air outlet to reduce the noise, but the nacelle cover needs to be long enough, the noise reduction is not obvious, and the structure is complex and difficult to maintain. Summary of the invention

[0005] The object of the present invention is to provide a wind turbine generator set to solve the problems of heat dissipation and noise control of the generator of a high-power wind turbine generator set.

[0006] According to one aspect of the present invention, there is provided a wind turbine generator set, which includes: a nacelle, a generator arranged on the windward side of the nacelle, and a heat dissipation system arranged in the nacelle, characterized in that the heat dissipation system includes: an air inlet, arranged on the side wall of the nacelle, for introducing outside air into the interior of the nacelle; an air outlet, arranged on the bottom wall of the nacelle; a first exhaust duct, one end of the first exhaust duct is connected to the interior of the generator; a cooling fan, the inlet of the cooling fan is connected to the other end of the first exhaust duct; a second exhaust duct, one end of the second exhaust duct is connected to the outlet of the cooling fan, and the other end of the second exhaust duct is connected to the air outlet.

[0007] Optionally, the air inlet may be arranged closer to the generator than the air outlet.

[0008] Optionally, a silencer may be provided in the second exhaust duct.

[0009] Optionally, the second exhaust duct may include an upper air duct and a lower air duct which are arranged in sections and detachably connected to each other, the upper air duct and the lower air duct are detachably connected to each other by flanges and fastening bolts, the upper end of the upper air duct is connected to the cooling fan, and the lower end of the lower air duct is connected to the air outlet.

[0010] Optionally, the silencer device may be a silencer plate, which is detachably arranged on the side wall of the upper air duct and / or the lower air duct by means of fastening screws.

[0011] Optionally, there may be a plurality of silencer sheets extending in the vertical direction and arranged in a plurality of rows in the second exhaust duct.

[0012] Optionally, the heat dissipation system can be provided in two groups, which are respectively provided on the left and right sides of the interior of the cabin.

[0013] Optionally, a protective net may be provided at one end of the second exhaust duct facing the air outlet, a hanging ring may be provided on each of the upper air duct and the lower air duct, a filter is provided at the air inlet, a sealing structure is provided at the air outlet, and the second exhaust duct is connected to the sealing structure.

[0014] Optionally, the cooling fan may be a centrifugal fan, an axial flow fan or a mixed flow fan.

[0015] Optionally, the wind turbine generator set may also include a controller for controlling the cooling fan so that natural wind from the outside enters the cabin through the air inlet, flows through the interior of the generator, passes through the first exhaust duct and the second exhaust duct, and is then discharged through the air outlet.

[0016] According to the wind turbine generator set of the present invention, the side air intake and bottom air outlet can be used to effectively dissipate heat from the generator, shorten the length of the nacelle cover, reduce the weight of the nacelle, control the load and cost of the set, and ensure the reliability of the set.

[0017] According to the wind turbine generator set of the present invention, the wind outlet at the bottom of the nacelle can avoid the influence of the wind outlet direction on the noise of the whole machine, thereby reducing the noise level of the whole machine. In addition, the wind outlet at the bottom of the nacelle makes it easier to maintain and replace parts, thereby reducing the risk of operation and maintenance.

[0018] According to the wind turbine generator set of the present invention, by arranging the air inlet closer to the generator than the air outlet, it is possible to effectively avoid the phenomenon that the hot air discharged from the cabin through the cooling fan reenters the cabin, causing the temperature of the cabin and the generator to increase.

[0019] According to the wind power generator set of the present invention, the noise of the cooling fan can be reduced by arranging the silencer.

[0020] According to the wind turbine generator set of the present invention, the second exhaust duct includes an upper duct and a lower duct which are arranged in sections and detachably connected to each other, so that the second exhaust duct can be easily maintained and replaced on the unit.

[0021] According to the wind turbine generator set of the present invention, a plurality of silencer sheets are provided, so that the aerodynamic noise at the second exhaust duct and the air outlet can be effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a front view of a wind turbine generator set according to an embodiment of the present invention;

[0023] Figure 2 is a top view of a wind turbine generator set according to an embodiment of the present invention;

[0024] Figure 3 is a front view of an example of a second exhaust duct according to an embodiment of the present invention;

[0025] Figure 4 is a top view of an example of a second exhaust duct according to an embodiment of the present invention.

[0026] Description of reference numerals:

[0027] 1-generator; 2-first exhaust duct; 3-air inlet; 4-air inlet filter; 5-cooling fan; 6-second exhaust duct; 7-air outlet; 8-cabin; 61-upper air duct; 62-silencer; 63-lifting ring; 64-silencer plate fastening screw; 65-flange; 66-lower air duct; 67-filter; 68-air duct fastening bolt. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the entire specification, the same reference numerals always indicate the same components.

[0029] The heat dissipation system of a wind turbine generator set according to the present invention is applied to a direct-drive wind turbine generator set. However, the present invention is not limited thereto. The heat dissipation system of a wind turbine generator set may also be applied to other types of wind turbine generator sets or to other generator systems that require air cooling.

[0030] According to an exemplary embodiment of the present invention, a heat dissipation system for a wind turbine generator set may include an air inlet and an air outlet and a pipe connecting the air inlet and the air outlet, and further include a cooling fan for driving air circulation. According to an embodiment of the present invention, the air inlet may be arranged on the side of the nacelle, and the air outlet may be arranged at the bottom of the nacelle. By adopting the side air inlet and bottom air outlet, the heat of the generator can be effectively dissipated, the length of the nacelle cover can be shortened, the weight of the nacelle can be reduced, the load and cost of the unit can be controlled, and the reliability of the unit can be ensured. On the other hand, due to the use of the air outlet at the bottom of the nacelle, the influence of the air outlet direction on the noise of the whole machine can be avoided, the noise level of the whole machine is reduced, and the noise of the air outlet at the bottom of the nacelle is significantly less than the noise of the air outlet at the tail of the nacelle. In addition, the air outlet at the bottom of the nacelle is easier to maintain and replace parts than the air outlet at the tail of the nacelle, which reduces the risk of operation and maintenance.

[0031] According to an exemplary embodiment of the present invention, a wind turbine generator set may be provided with two heat dissipation systems, which are respectively provided on the left and right sides of the interior of the nacelle. The wind turbine generator set may include two heat dissipation systems that are symmetrically arranged with respect to each other. The advantage of such an arrangement is that the generator can be cooled more evenly, thereby improving the reliability of the heat dissipation system. Here, the two left-right symmetrical heat dissipation systems may share one air inlet, or each may have at least one air inlet. The heat dissipation system of a wind turbine generator set according to an exemplary embodiment of the present invention will be introduced below by taking an example in which each heat dissipation system includes one air inlet.

[0032] Figure 1 is a front view of a wind turbine generator set according to an embodiment of the present invention, and Figure 2 is a top view of a wind turbine generator set according to an embodiment of the present invention.

[0033] like Figure 1 As shown in FIG. 8 , the wind turbine generator set includes a nacelle 8 , a generator 1 arranged on the windward side of the nacelle 8 , and a heat dissipation system arranged in the nacelle 8 .

[0034] The heat dissipation system of the wind turbine generator set according to the embodiment of the present invention comprises: an air inlet 3, which is arranged on the side wall of the nacelle 8 and is used to introduce outside air into the nacelle 8; an air outlet 7, which is arranged on the bottom wall of the nacelle 8; a first exhaust duct 2, one end of which is connected to the inside of the generator 1; a cooling fan 5, the inlet of the cooling fan 5 is connected to the other end of the first exhaust duct 2; a second exhaust duct 6, one end of which is connected to the outlet of the cooling fan 5, and the other end of the second exhaust duct 6 is connected to the air outlet 7. When the cooling fan 5 is working, the inside of the generator can present a state of slight negative pressure, so that the cold air entering the nacelle 8 through the air inlet 3 can enter the generator to cool the components of the generator.

[0035] According to the embodiment of the present invention, the air inlet 3 is arranged on the side of the nacelle 8, and when the heat dissipation system is turned off, the heat inside the nacelle 8 can be promptly dissipated to the outside of the nacelle 8 through the air inlet 3. When the heat dissipation system is turned on, the cold air sucked from the air inlet 3 can be directly introduced into the interior of the generator 1 to effectively cool the generator 1, and a part of the cold air can flow in the nacelle 8 to reduce the temperature in the nacelle 8.

[0036] Optionally, an air inlet filter 4 may be provided at the air inlet 3 to filter the cold air outside the cabin, to prevent dust particles in the cold air from entering the cabin 8 and the generator 1, thereby affecting the cleanliness of the interior of the unit, and damaging the electrical components in the cabin 8 and the generator 1, thereby affecting their performance. In addition, the air inlet filter 4 can be used for waterproofing, to prevent rain or moisture from entering the cabin 8 and damaging the electrical components when encountering rain or humid weather.

[0037] The first exhaust duct 2 can be used to collect and transport hot air from the generator 1, so that the hot air flows along the first exhaust duct 2 in the nacelle 8, and prevents the hot air from flowing into the nacelle 8 as a whole, causing the air temperature to rise. According to an embodiment, a ventilating hole can be provided on the impeller-side end plate of the nacelle 8, so that the internal space of the nacelle 8 is connected with the interior of the generator 1, so that the external cold air entering the nacelle 8 can enter the interior of the generator 1. A supporting hole can also be provided on the impeller-side end plate of the nacelle 8, and one end of the first exhaust duct 2 can pass through the supporting hole and be connected with the interior of the generator 1.

[0038] Further, the first exhaust duct 2 can be provided in plurality, and the first ends of the plurality of first exhaust ducts 2 close to the generator 3 can be respectively connected to different positions of the generator 3, and the second ends of the plurality of first exhaust ducts 2 are finally connected to the cooling fan 5. For example, the first exhaust duct 2 can include an upper exhaust duct and a lower exhaust duct, which are respectively provided at the upper and lower parts of the generator 3, and the hot air from the upper and lower parts of the generator 3 flows into the upper exhaust duct and the lower exhaust duct respectively, and then is discharged to the outside of the nacelle 8 through the cooling fan 5 and the second exhaust duct 6. For another example, the first ends of the plurality of first exhaust ducts 2 close to the generator 3 can all be provided at the upper part of the generator 3, and due to thermal expansion and contraction, the hot air of the generator will move to the upper part of the generator. By providing a plurality of first exhaust ducts 2, the cooling efficiency of the generator 3 can be improved.

[0039] The cooling fan 5 can draw air from the generator 1, thereby providing power for the flow of hot air, and further providing power for the airflow circulation of the heat dissipation system. Specifically, when the cooling fan 5 is started, the hot air in the generator is collected in the first exhaust duct 2, and enters the cooling fan 5 along the first exhaust duct 2. The cooling fan 5 can be a centrifugal fan, etc. When the hot air flows into the cooling fan 5, the hot air discharged toward the rear of the cabin in the first exhaust duct 2 changes its wind direction, flows through the second exhaust duct 6 and the air outlet 7 at the bottom of the cabin, and is discharged to the outside of the cabin. However, the cooling fan 5 can also be replaced by other types of fans, such as axial flow fans or mixed flow fans.

[0040] When the cooling fan 5 is started, the hot air in the generator 1 is extracted and discharged to the outside of the nacelle 8, so that the inside of the generator 1 presents a slightly negative pressure state relative to the air in the nacelle 8 as a whole. Therefore, the cold air in the nacelle 8 is introduced into the generator 1 to cool the generator 1. In this case, the air in the nacelle 8 presents a slightly negative pressure state relative to the outside of the nacelle 8 as a whole, so that the cold air outside the nacelle 8 enters the nacelle 8 through the air inlet 3.

[0041] The air outlet 7 allows the second exhaust duct 6 to communicate with the outside air, and the hot air from the generator is discharged to the outside of the nacelle 8 through the air outlet 7. A sealing structure may be provided at the air outlet 7, and the second exhaust duct 6 may be connected to the sealing structure to prevent the hot air in the second exhaust duct 6 from leaking into the inside of the nacelle 8.

[0042] Optionally, the air inlet 3 is arranged to be closer to the generator 1 than the air outlet 7. That is, the distance between the air outlet 7 and the generator 1 is greater than the distance between the air inlet 3 and the generator 1, and the air outlet 7 is located lower than the air inlet 1, so that the cold air from the outside directly enters the interior of the generator 1 after passing through a shorter airflow path, and prevents the hot air discharged from the air outlet 7 from returning to the cabin 8 through the air inlet 3.

[0043] According to the embodiment, it is preferred to adopt the side air inlet and bottom air outlet mode, which can effectively dissipate the heat of the generator. In addition, compared with the prior art in which the air outlet is set at the tail of the nacelle, the length of the nacelle cover can be shortened, the weight of the nacelle can be reduced, the load and cost of the unit can be controlled, and the reliability of the unit can be ensured. Setting the air inlet closer to the generator than the air outlet can effectively avoid the phenomenon that the hot air discharged from the nacelle by the cooling fan enters the nacelle again, causing the temperature of the nacelle and the temperature of the generator to rise. On the other hand, since the air outlet at the bottom of the nacelle is adopted, the influence of the air outlet direction on the noise of the whole machine can be avoided, and the noise level of the whole machine is reduced. The noise of the air outlet at the bottom of the nacelle is significantly less than the noise of the air outlet at the tail of the nacelle. In addition, the air outlet at the bottom of the nacelle is easier to maintain and replace parts than the air outlet at the tail of the nacelle, reducing the risk of operation and maintenance.

[0044] In addition, since the main components of the heat dissipation system according to the embodiment of the present invention are all arranged inside the nacelle 8, the maintenance or replacement of the main components of the heat dissipation system will be more convenient.

[0045] Figure 3 is a front view of an example of a second exhaust duct according to an embodiment of the present invention, Figure 4 is a top view of an example of a second exhaust duct according to an embodiment of the present invention.

[0046] The second exhaust duct 6 can be used as a hot air conveying passage, and the hot air flowing out of the cooling fan 5 flows through the second exhaust duct 6 and is discharged to the outside of the cabin 8 .

[0047] Optionally, the second exhaust duct 6 may include an upper duct 61 and a lower duct 66 which are arranged in sections and detachably connected to each other. The upper duct 61 and the lower duct 66 are detachably connected to each other through a flange and a fastening bolt 68. The upper end of the upper duct 61 may be connected to the outlet of the cooling fan 5, and the lower end of the lower duct 66 may be connected to the air outlet 7. By arranging the second exhaust duct 6 in sections, the processing of the duct can be facilitated, the overall strength of the second exhaust duct 6 can be improved, and the maintenance and replacement of the second exhaust duct 6 on the unit can also be facilitated.

[0048] In addition, each of the upper air duct 61 and the lower air duct 66 may be provided with a lifting ring, so that the hook of the external lifting equipment can be hooked on the lifting ring to further facilitate the maintenance and replacement of the second exhaust duct 6 on the unit.

[0049] According to the embodiment of the present invention, the second exhaust duct 6 includes an upper duct 61 and a lower duct 66 as an example for explanation, but the number of ducts included in the second exhaust duct 6 is not limited thereto, for example, the ducts may be formed into at least three ducts connected to each other. The ends of the upper duct 61 and the lower duct 66 may be provided with connecting flanges, and the upper duct 61 and the lower duct 66 are connected to each other by flanges and bolts, however, the connection method is not limited thereto, and pin-type connection, card-type connection, etc. may also be used.

[0050] In addition, a protective net is provided at one end of the second exhaust duct 6 facing the air outlet 7 to prevent foreign objects outside the cabin 8 from entering the second exhaust duct 6 and affecting the performance of the heat dissipation system.

[0051] In order to reduce the noise caused by the heat dissipation system of the wind turbine generator set, according to an embodiment of the present invention, a silencer 62 may be provided in the second exhaust duct 6 , and the silencer 62 may be used to reduce the noise of the cooling fan 5 .

[0052] The silencer 62 may be a silencer sheet, which is detachably arranged on the side wall of the upper air duct 61 and / or the lower air duct 66 by means of a fastening screw 64. There may be a plurality of silencers, which extend in the vertical direction and are arranged in a plurality of rows in the second exhaust duct 6, thereby dividing the internal space of the second exhaust duct 6 into a plurality of exhaust air ducts. After the airflow passes through the silencer 62, the aerodynamic noise at the second exhaust duct 6 and the air outlet 7 can be effectively reduced.

[0053] The silencer can be made of a microporous metal plate, or made of noise reduction cotton, noise reduction cotton is sandwiched between microporous metal plates, or made of a microporous metal plate wrapped with noise reduction cotton, which has low production cost and is easy to manufacture. The silencer 62 is arranged inside the second exhaust duct 6, so that the second exhaust duct 6 has a noise reduction function, reducing the aerodynamic noise of the heat dissipation system of the wind turbine. In addition, the length of the silencer can be designed according to the noise control requirements of the wind turbine, so silencers of different lengths can be installed for different regions, thereby saving costs. In addition, when the wind turbine does not need to control noise, the silencer 62 can be not installed, thereby saving costs. The second exhaust duct 6 is arranged in multiple sections, which is conducive to the installation and disassembly of the silencer and the adjustment of the length of the silencer according to the noise control requirements.

[0054] Since the power generation state of the wind turbine generator set depends on the size of the external wind, the set is not in real-time operation, so the temperature of the generator 1 is not always in a high temperature state. Therefore, the heat dissipation system can have a working state and a closed state. In order to ensure that the heat dissipation system operates normally, efficiently and energy-savingly, the wind turbine generator set also includes a controller (not shown) for controlling the cooling fan 5, so that the natural wind from the outside enters the nacelle 8 through the air inlet 3, flows through the interior of the generator 1, passes through the first exhaust duct 2 and the second exhaust duct 6, and then is discharged through the air outlet 7. In addition, the wind turbine generator set can also be provided with a temperature monitoring device (not shown) for monitoring the temperature of the generator 1. The controller can receive the result from the temperature monitoring device, control the cooling fan 5, and thus control the opening and closing of the heat dissipation system.

[0055] When the wind turbine generator set is not in operation, the cooling system may be in a closed state. When the wind turbine generator set is in operation, when the temperature of the generator 1 gradually rises to a set temperature, the controller may control the cooling fan 5 to start and cool the generator 1.

[0056] As described above, according to the wind turbine generator set of the present invention, the side air intake and bottom air outlet can be used to effectively dissipate the heat of the generator, shorten the length of the nacelle cover, reduce the weight of the nacelle, control the load and cost of the set, and ensure the reliability of the set.

[0057] According to the wind turbine generator set of the present invention, the wind outlet at the bottom of the nacelle can avoid the influence of the wind outlet direction on the noise of the whole machine, thereby reducing the noise level of the whole machine. In addition, the wind outlet at the bottom of the nacelle makes it easier to maintain and replace parts, thereby reducing the risk of operation and maintenance.

[0058] According to the wind turbine generator set of the present invention, by arranging the air inlet closer to the generator than the air outlet, it is possible to effectively avoid the phenomenon that the hot air discharged from the cabin through the cooling fan reenters the cabin, causing the temperature of the cabin and the generator to increase.

[0059] According to the wind power generator set of the present invention, the noise of the cooling fan can be reduced by arranging the silencer.

[0060] According to the wind turbine generator set of the present invention, the second exhaust duct includes an upper duct and a lower duct which are arranged in sections and detachably connected to each other, so that the second exhaust duct can be easily maintained and replaced on the unit.

[0061] According to the wind turbine generator set of the present invention, a plurality of silencer sheets are provided, so that the aerodynamic noise at the second exhaust duct and the air outlet can be effectively reduced.

[0062] While some embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that modifications may be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A wind turbine generator set, comprising a nacelle (8), a generator (1) arranged on the windward side of the nacelle (8), and a heat dissipation system arranged in the nacelle (8), It is characterized in that The heat dissipation system comprises: An air inlet (3) is arranged on a side wall of the cabin (8) and is used to introduce outside air into the cabin (8); An air outlet (7) is arranged on the bottom wall of the cabin (8); A first exhaust duct (2), one end of the first exhaust duct (2) being in communication with the interior of the generator (1); a cooling fan (5), wherein the inlet of the cooling fan (5) is connected to the other end of the first exhaust duct (2); a second exhaust duct (6), one end of the second exhaust duct (6) being connected to the outlet of the cooling fan (5), and the other end of the second exhaust duct (6) being connected to the air outlet (7), The air inlet (3) is arranged to be closer to the generator (1) than the air outlet (7).

2. The wind turbine generator set according to claim 1, It is characterized in that A silencer (62) is provided in the second exhaust duct (6).

3. The wind turbine generator set according to claim 2, It is characterized in that The second exhaust duct (6) comprises an upper air duct (61) and a lower air duct (66) which are arranged in sections and are detachably connected to each other. The upper air duct (61) and the lower air duct (66) are detachably connected to each other via flanges and fastening bolts. The upper end of the upper air duct (61) is connected to the cooling fan (5), and the lower end of the lower air duct (66) is connected to the air outlet (7).

4. The wind turbine generator set according to claim 3, It is characterized in that The silencer device (62) is a silencer plate, which is detachably arranged on the side wall of the upper air duct (61) and / or the lower air duct (66) by means of fastening screws.

5. The wind turbine generator set according to claim 4, It is characterized in that The noise-absorbing sheets are multiple, extending in the vertical direction and arranged in multiple rows in the second exhaust duct (6).

6. The wind turbine generator set according to any one of claims 1 to 5, It is characterized in that The heat dissipation system is provided in two groups, which are respectively provided on the left and right sides of the interior of the cabin (8).

7. The wind turbine generator set according to claim 3, It is characterized in that A protective net is provided at one end of the second exhaust duct (6) facing the air outlet (7), a hanging ring is provided on each of the upper air duct (61) and the lower air duct (66), a filter is provided at the air inlet (3), a sealing structure is provided at the air outlet (7), and the second exhaust duct (6) is connected to the sealing structure.

8. The wind turbine generator set according to any one of claims 1 to 5, It is characterized in that The cooling fan (5) is a centrifugal fan, an axial flow fan or a mixed flow fan.

9. The wind turbine generator set according to any one of claims 1 to 5, It is characterized in that The wind turbine generator set further comprises a controller for controlling the cooling fan (5) so that the external natural wind enters the nacelle (8) through the air inlet (3), flows through the interior of the generator (1), passes through the first exhaust duct (2) and the second exhaust duct (6), and is then discharged through the air outlet (7).

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