A wind turbine cooling nacelle and a wind turbine

Abstract

The application provides a wind power generator heat dissipation cabin and a wind power generator set, which comprises a cabin main body, a gear box area and a motor area are sequentially arranged in the cabin main body along the direction away from the fan blade, an air inlet channel for introducing fresh air into the motor area is arranged at the bottom of the cabin main body, an air inlet channel for introducing fresh air into the gear box area is arranged in the tower body connected with the cabin main body, a flow guide device is arranged at the top of the cabin main body, a flow guide channel is arranged in the flow guide device and transversely penetrates the flow guide device, the flow guide channel is connected with the inside of the cabin main body through two heat exhaust channels arranged side by side, and the connection positions of the two heat exhaust channels with the cabin main body correspond to the gear box area and the motor area respectively. The application can improve the heat dissipation efficiency of the whole cabin without increasing the power of the heat dissipation fan, and ensures the reliability of the wind power generator set.

Description

Technical Field

[0001] This invention relates to the field of wind power generation technology, and in particular to a wind turbine cooling nacelle and a wind turbine generator set. Background Technology

[0002] During the transmission process, the gearbox and generator inside the nacelle of a wind turbine generate heat due to friction and wear. To ensure the normal operation of the unit, existing wind turbine cooling systems typically use forced air cooling.

[0003] However, due to the limitations of space inside the nacelle and the weight of the wind turbine at the factory, the size of the cooling fan is limited. This results in a limited cooling range for the single air-cooling mode, which cannot provide sufficient cooling capacity when the wind turbine is operating under high load or in high ambient temperature. Simply increasing the power of the cooling fan will increase the energy consumption of the wind turbine, and the failure rate of high-power cooling fans will also increase, thereby reducing the reliability of the wind turbine. Summary of the Invention

[0004] To address the shortcomings of the prior art, the present invention provides a wind turbine cooling nacelle and a wind turbine generator set, which improves the heat dissipation efficiency inside the nacelle by improving the layout of the air ducts.

[0005] The technical solution of this invention is as follows: a wind turbine cooling nacelle, comprising a nacelle body, a gearbox area and a motor area sequentially arranged along the direction away from the fan blades within the nacelle body, an air intake channel for introducing fresh air into the motor area at the bottom of the nacelle body, and an air inlet channel for introducing fresh air into the gearbox area within the tower body connected to the nacelle body, wherein a flow guide is installed at the top of the nacelle body, and a flow guide channel extending laterally through the flow guide is formed within the flow guide. The flow guide channel is connected to the interior of the nacelle body via two parallel heat exhaust channels, the connection points of the two heat exhaust channels with the nacelle body corresponding to the gearbox area and the motor area, respectively. Under the Coanda effect of the fluid, the flow guide carries the hot air from inside the nacelle body out through the heat conduction channels via natural wind, thereby improving the airflow path of the hot air inside the nacelle body and increasing the cooling efficiency of the nacelle.

[0006] The U-shaped air intake duct is arranged around the outside of the tower and fixed to the bottom of the main nacelle. The two ends of the U-shaped opening side of the air intake duct are the air intake inlets, and the cross-section of the air intake inlets is coplanar with the longitudinal axis cross-section of the tower. The upper end of the closed U-shaped side of the air intake duct is connected to the motor area inside the main nacelle via the air intake outlet. Due to the columnar structure of the tower, the external airflow experiences an acceleration effect at the outer edge of the tower, with the maximum wind speed at the longitudinal axis cross-section. By arranging the U-shaped air intake duct around the outside of the tower, the airflow velocity is maximized to enter the main nacelle, thereby more effectively utilizing natural wind for cooling and reducing the power required for the cooling fan.

[0007] The air intake duct is vertically installed inside the tower body. The upper end of the duct connects to the gear area inside the main engine room via an air inlet, and the lower end connects to the lower side wall of the tower body via an air inlet. This vertical installation creates a chimney effect within the tower body, supplying air to the main engine room and accelerating airflow. Simultaneously, it allows dust within the duct to fall due to its own weight during the upward movement, thus filtering the dust.

[0008] The flow guide channel is divided into a pressurization section, a mixing section, and a discharge section along the direction away from the fan blades. The pressurization section and the discharge section are arranged in a gradually decreasing size from the outside to the inside. The heat exhaust channel is connected to the flow guide channel within the mixing section. The pressurization section accelerates the natural air entering the flow guide channel, and the discharge section releases the accelerated and mixed gas, ensuring that the airflow enters the mixing section at the fastest speed. According to Bernoulli's principle, the air pressure in the mixing section is the lowest. Subsequently, the airflow in the main body of the nacelle is drawn into the mixing section through the heat exhaust channel, further enhancing the flow guide effect of the flow guide on the hot airflow in the main body of the nacelle and improving the overall heat dissipation efficiency of the nacelle.

[0009] The pressurization section is equipped with multiple swirl vanes, which are fixed to the inner wall of the flow guide channel in a spiral pattern.

[0010] The connection between the heat exhaust channel and the guide channel is designed with an outward-flaring flared opening, and the highest point of the heat exhaust channel is higher than the top surface of the main body of the cabin. The outward-flaring flared opening can increase the adhesion effect of the heat exhaust channel and also form a water-blocking part on the top of the main body of the cabin, thereby improving the safety of the heat exhaust channel.

[0011] The upper end of the U-shaped closed side of the air intake channel has an arc-shaped guide section.

[0012] Cooling fans are installed at the connection points between each of the aforementioned heat dissipation channels and the main body of the engine compartment.

[0013] A wind turbine generator set includes the aforementioned wind turbine generator cooling nacelle. A gearbox and a generator are respectively fixedly mounted on the gearbox area and the motor area via a base. Cooling fins are installed on the outer sides of the gearbox and the generator, and the fin spacing of the cooling fins is vertically distributed.

[0014] The beneficial effects of this invention are as follows: This design utilizes a flow guide to allow the fluid, under the Coanda effect, to carry hot air from the main body of the nacelle out through the heat conduction channel via natural wind, thereby improving the airflow path of hot air within the nacelle and enhancing its heat dissipation efficiency. It also leverages the acceleration effect of external airflow at the outer edge of the tower body by surrounding the tower body with a U-shaped air intake channel, maximizing the airflow velocity into the nacelle and thus more effectively utilizing natural wind cooling, reducing the power required for cooling fans. The vertically installed air intake channel creates a chimney effect within the tower body, supplying air to the nacelle and accelerating airflow. Simultaneously, it allows dust within the channel to fall due to its own weight during the upward movement, effectively filtering dust. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional schematic diagram of the present invention; Figure 3 yes Figure 2 A magnified view of part A in the image; Figure 4 This is a schematic diagram of the internal structure of the flow guide in this invention; Figure 5 This is a schematic diagram of the air intake channel in this invention.

[0016] Reference numerals: 1. Main body of the nacelle; 101. Tower body; 102. Fan blade; 2. Flow guide; 201. Pressurization section; 201. Mixing section; 203. Exhaust section; 3. Air intake duct; 301. Air intake inlet; 302. Air intake outlet; 303. Arc-shaped flow guide; 4. Air intake duct; 401. Air intake inlet; 402. Air intake outlet; 5. Heat exhaust duct; 501. Cooling fan; 6. Generator; 7. Gearbox; 8. Heat dissipation fins. Detailed Implementation

[0017] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Other embodiments obtained by those skilled in the art without creative effort should all fall within the protection scope of this invention.

[0018] like Figures 1-3As shown, the present invention provides a wind turbine cooling nacelle, including a nacelle body 1. A gearbox 7 area and a motor area are sequentially arranged inside the nacelle body 1 along the direction away from the fan blades 102. An air intake channel 3 for introducing fresh air into the motor area is provided at the bottom of the nacelle body 1. An air inlet channel 4 for introducing fresh air into the gearbox 7 area is provided inside the tower body 101 connected to the nacelle body 1. A flow guide 2 is installed on the top of the nacelle body 1. A flow guide channel is opened inside the flow guide 2, and the flow guide channel is connected to the interior of the nacelle body 1 via two parallel heat exhaust channels 5. The connection positions of the two heat exhaust channels 5 with the nacelle body 1 correspond to the gearbox 7 area and the motor area, respectively. The heat generated by the operation of the electric motor and gearbox 7 inside the main body of the cabin radiates into the cabin air, forming hot air. Under thermal pressure, the hot air rises into the heat exhaust channel 5. When the outside natural air flows through the guide vane 2, the fluid in the guide vane 2 carries the hot air in the heat exhaust channel 5 out through the heat conduction channel under the Coanda effect. At the same time, the air inlet channel 4 and the air duct 3 provide fresh air to the gearbox 7 and the area below the electric motor, forming a dual air duct structure in the main body of the cabin 1, which effectively improves the heat dissipation efficiency of the cabin.

[0019] like Figure 4 As shown, the air duct 3 is U-shaped and surrounds the outside of the tower body 101 and is fixed to the bottom of the main body 1 of the nacelle. The two ends of the U-shaped open side of the air duct 3 are the air inlets 301 of the air duct 3, and the cross section of the air inlet is coplanar with the longitudinal axis cross section of the tower body 101. The upper end of the U-shaped closed side of the air duct 3 is connected to the motor area inside the main body 1 of the nacelle through the air outlet 302. Because of the columnar structure of the tower body 101, the external airflow forms an acceleration effect at the outer edge of the tower body 101, and the wind speed is the greatest at the longitudinal axis section of the tower body 101. By surrounding the outside of the tower body 101 with the U-shaped air intake channel 3, the air intake speed is maximized to enter the main body of the nacelle 1, thereby making more effective use of natural wind for cooling and reducing the power required for the cooling fan. Preferably, in order to avoid the wind speed from decreasing in the air intake channel 3, the upper end of the U-shaped closed side of the air intake channel 3 has an arc-shaped guide part 303. The natural wind entering the air intake channel 3 from the air intake inlet 301 enters the air intake outlet 302 through the arc-shaped guide part 303 under the effect of the wall adhesion.

[0020] like Figure 2 As shown, the air intake duct 4 is vertically installed inside the tower body 101. The upper end of the air intake duct 4 is connected to the gear area inside the main body of the nacelle 1 via the air intake outlet 402, and the lower end of the air intake duct 4 is connected to the lower side wall of the tower body 101 via the air intake inlet 401. The vertical installation of the air intake duct 4 creates a chimney effect within the tower body 101 to supply air to the main body of the nacelle 1, accelerating air circulation. At the same time, it allows dust in the duct to fall due to its own weight during the upward process, thus filtering dust.

[0021] like Figure 5 As shown, the flow channel is divided into a pressurization section 201, a mixing section 201 and a discharge section 203 along the direction away from the fan blade 102. The pressurization section 201 and the discharge section 203 are arranged in a gradually decreasing size from the outside to the inside. The heat exhaust channel 5 is connected to the flow channel in the area of ​​the mixing section 201. The pressurization section 201 accelerates the natural air entering the guide channel, and the discharge section 203 releases the accelerated and mixed gas, so that the airflow enters the mixing section 201 at the fastest speed. According to Bernoulli's principle, the air pressure in the mixing section 201 is the lowest. Then, the airflow in the main body of the cabin 1 is drawn into the mixing section 201 through the heat exhaust channel 5, which further improves the guiding effect of the guide device 2 on the hot airflow in the main body of the cabin 1 and improves the heat dissipation efficiency of the entire cabin. Preferably, in order to further improve the flow rate of natural air in the pressurization section 201, the pressurization section 201 is provided with multiple swirl vanes, which are fixed in a spiral pattern on the inner wall of the guide channel.

[0022] To further enhance the adhesion effect of hot air within the exhaust channel 5, the exhaust channel 5 is designed with an outward-flaring flared opening at its connection with the guide channel, and the highest point of the exhaust channel 5 is higher than the top surface of the main body 1 of the cabin. This outward-flaring flared opening, extending above the top surface of the main body 1 of the cabin, also forms a water-blocking section at the top of the main body 1, thereby improving the safety of the exhaust channel 5.

[0023] To ensure effective heat dissipation within the main body 1 of the engine compartment and to prevent debris from entering or exiting during heat dissipation, cooling fans 501 are installed at the connection points between each of the heat exhaust channels 5 and the main body 1 of the engine compartment. Louvers are installed at the inlet of the pressurization section 201 and the outlet of the discharge section 203 of the heat conductor, at the air intake 301 of the air intake channel 3, and at the air intake 401 of the air intake channel 4. A filter screen is fixed inside the louvers.

[0024] The present invention also provides a wind turbine generator set, including the aforementioned wind turbine generator cooling nacelle. A gearbox 7 and a generator 6 are respectively fixedly mounted on the gearbox 7 area and the motor area via a base. Cooling fins 8 are installed on the outer sides of the gearbox 7 and the generator 6, with the fin spacing of the cooling fins 8 being vertically distributed. The vertically distributed cooling fins 8 ensure that their fin spacing aligns with the airflow direction within the nacelle body 1, thereby better dissipating heat from the generator 6 and the gearbox 7.

[0025] During wind turbine operation, generator 6 and gearbox 7 generate heat and dissipate it into the space inside the nacelle 1. After passing through tower 101, the outside natural wind accelerates to its maximum speed at the longitudinal section of tower 101 and reaches the bottom of generator 6 through air intake duct 3. The natural wind at the bottom of tower 101 flows through air intake duct 4 and, under the effect of the chimney effect, flows to the bottom of gearbox 7. The heat generated by generator 6 and gearbox 7 heats the incoming natural wind into hot air. The hot air rises under thermal pressure and enters the guide channel through its corresponding heat exhaust duct 5 via the wall effect. The outside natural wind flows through the guide channel and is pressurized by pressurization section 201. Under the effect of Coanda effect, it forms a suction force on the heat exhaust duct 5, thereby drawing the hot air out of the nacelle 1 and jetting it into the atmosphere through discharge section 203. This improves the heat dissipation efficiency of the entire nacelle without increasing the power of cooling fan 501, ensuring the reliability of the wind turbine operation.

Claims

1. A wind turbine cooling nacelle, comprising a nacelle body, wherein a gearbox area and a motor area are sequentially arranged within the nacelle body along a direction away from the fan blades, characterized in that, The bottom of the main body of the nacelle is provided with an air intake duct for introducing fresh air into the motor area. The tower body connected to the main body of the nacelle is provided with an air inlet duct for introducing fresh air into the gearbox area. A flow guide is installed on the top of the main body of the nacelle, and a flow guide channel runs horizontally through the flow guide. The flow guide channel connects to the interior of the main body of the nacelle via two parallel heat exhaust channels. The connection points of the two heat exhaust channels with the main body of the nacelle correspond to the gearbox area and the motor area, respectively. The air intake duct is U-shaped and surrounds the outside of the tower body and is fixed to the bottom of the main body of the nacelle. The two ends of the U-shaped opening of the air intake duct are the air intake inlets, and the cross-section of the air intake inlets is perpendicular to the longitudinal axis of the tower body. The cross-section is coplanar, and the upper end of the U-shaped closed side of the air intake channel is connected to the motor area inside the main body of the nacelle via the air intake outlet; the air intake channel is vertically installed inside the tower body, and the upper end of the air intake channel is connected to the gear area inside the main body of the nacelle via the air intake outlet, and the lower end of the air intake channel is connected to the lower side wall of the tower body via the air intake inlet; the guide channel is divided into a pressurization section, a mixing section and a discharge section along the direction away from the fan blades, and the pressurization section and the discharge section are arranged in a gradually decreasing size from the outside to the inside. The heat exhaust channel is connected to the guide channel at the location within the mixing section area; the heat exhaust channel is arranged in an outward-flaring funnel shape at the connection with the guide channel, and the highest point of the heat exhaust channel is higher than the top surface of the main body of the nacelle.

2. The wind turbine cooling nacelle according to claim 1, characterized in that, The pressurization section is equipped with multiple swirl vanes, which are fixed to the inner wall of the flow guide channel in a spiral pattern.

3. The wind turbine cooling nacelle according to claim 1, characterized in that, The upper end of the U-shaped closed side of the air intake channel has an arc-shaped guide section.

4. A wind turbine cooling nacelle according to claim 1, characterized in that, Cooling fans are installed at the connection points between each of the aforementioned heat dissipation channels and the main body of the engine compartment.

5. A wind turbine generator set, characterized in that, The wind turbine generator set includes a wind turbine heat dissipation nacelle as described in any one of claims 1-4, wherein a gearbox and a generator are fixedly mounted on the gearbox area and the motor area respectively via a base, and heat dissipation fins are installed on the outer side of the gearbox and the generator, wherein the fin spacing of the heat dissipation fins is vertically distributed.

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